WO2023065603A1 - 3d printing apparatus and rotary filament-feeding mechanism thereof - Google Patents

Abstract

Disclosed in the present invention are a 3D printing apparatus and a 3D printing pen, and a rotary filament-feeding mechanism thereof. The 3D printing pen comprises a pen body, a rotary filament-feeding mechanism and a heating mechanism, wherein a conveying channel for passage of a consumable is provided inside the pen body; and the rotary filament-feeding mechanism comprises a plurality of rotary cutting elements arranged spaced apart from one another, and the plurality of rotary cutting elements are configured to be driven to rotate, so as to cut and feed the consumable, thereby conveying the consumable in the conveying channel to a nozzle. Rotary cutting blades are provided, and the defect of an existing helical tooth structure stopping due to excessive friction or idling due to too little friction is overcome, such that the requirements for positive and negative tolerances of a consumable are low, and the consumable can be stably and reliably conveyed forwards.

Description

3D printing equipment and its rotary wire feeding mechanism technical field

The invention relates to the technical field of 3D printing equipment, in particular to a 3D printing equipment and a rotary wire feeding mechanism applied to the 3D printing equipment.

Background technique

With the development of science and technology, 3D printing technology is more and more widely used in various fields. At the same time, 3D printing technology also appears in people's life in the form of more types of products. Common products include 3D printers and 3D printers. printing pen.

The working principle of 3D printers is basically the same as that of ordinary printers, but the printing materials are somewhat different. The printing materials of ordinary printers are ink and paper, while 3D printers are equipped with different "printing materials" such as metal, ceramics, plastics, sand, etc., which are real. After the printer is connected to the computer, the "printed materials" can be superimposed layer by layer through computer control, and finally the blueprint on the computer can be turned into a real object. In layman's terms, a 3D printer is a device that can "print" a real 3D object, such as printing a robot, printing a toy car, printing various models, or even food.

The 3D printing pen is different from the 3D printer that realizes 3D printing through the movement of the printing nozzle driven by the mechanical arm: the 3D printing pen is controlled by human hands, and the 3D printing pen can realize three-dimensional painting according to the wishes of the person, that is to say, the user only needs to pass Traditional brush operations can draw three-dimensional patterns in a three-dimensional environment. At present, the 3D printing pen adopts hot-melt deposition technology, and the ink inside it is made of hot-melt materials, such as PLA (polylactic acid) material or ABS (acrylonitrile-butadiene-styrene copolymer) material, which are also commonly called consumables. During use, the hot-melt material in the 3D printing pen is heated and ejected from the pen tip, and then the hot-melt material cools down to form a 3D drawn pattern.

An existing 3D drawing pen includes a pen shell, and the inside of the pen shell is provided with a feeder along its length direction, the outlet end of the feeder is connected to the nozzle of the 3D drawing pen, and the wire feeding mechanism is arranged on the pen. The inner cavity of the shell, the wire feeding mechanism includes a worm and a drive motor, the axial direction of the worm is parallel to the length direction of the material channel, the worm has at least two helical teeth, and the pen housing corresponds to the The worm is provided with a receiving groove, and one side of the receiving groove runs through the material channel, and the driving motor drives the worm to rotate, and the helical teeth on the worm rotate and cut into the consumables, driving the consumables to spirally advance.

In the above-mentioned products, the main structure for advancing consumables is the helical tooth. It can be seen from the attached drawings that the helical tooth has continuous threads. In actual use, it is found that the frictional force of consumables (usually plastic filaments) is particularly large when they are in contact with the thread, resulting in a particularly large change in the thickness of the consumables after they pass through and are inconsistent. The specific situation is that the requirements for the thickness of consumables are particularly high. If the tolerance is a little positive, the consumables will not enter and the motor will not be able to rotate; if the tolerance is a little negative, the consumables will slip. In addition, the helical teeth are arranged on one side of the consumables, resulting in uneven stress on the consumables, which further reduces the consistency of the consumables after they pass through.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a 3D printing device and its rotary wire feeding mechanism.

The technical solution of the present invention to solve the technical problem is: a rotary wire feeding mechanism applied to 3D printing equipment, including a driving device, a transmission assembly and a rotary cutting blade arranged in sequence according to the transmission sequence, and the rotary cutting blade has consumable drive The channel is used to wrap the consumables and convey them forward. The rotary cutting blade includes a driven rotating base and an elastic sheet that is inclined inwardly from the driven rotating base. The driven rotating base and the The transmission assembly forms a transmission fit, and the engaging elastic sheet is at least partially obliquely cut into the consumable to apply a propulsion force for the consumable to move forward.

Preferably, there are a plurality of said engaging elastic pieces and they are arranged intermittently with each other.

As a preference, there are two snapping elastic pieces and they are arranged symmetrically about the center.

As a preference, there are three snapping elastic pieces and they are evenly arranged at intervals of 120 degrees.

Preferably, a helix angle ω is formed between the engaging elastic sheet and the consumable.

Preferably, the snapping elastic sheet has a short side and a long side, and an inclined blade connected between the short side and the long side, and the helix angle is formed between the inclined blade and the consumable omega.

Preferably, the inclined blade has a cutting surface that gradually slopes outward from bottom to top.

Preferably, the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, D is the outer diameter of the consumable, and af is the cutting amount;

Wherein, the consumable lead P=F/(n×π×(D/2)^2), wherein F is the extruded amount of the consumable, and n is the rotational speed of the driving device.

Preferably, the transmission assembly includes an input gear driven by a driving device, and a wire feeding gear meshed with the input gear, and the wire feeding gear has a consumable channel through which the consumables pass.

Preferably, it also includes that the rotary cutting blade is coaxial with the consumable material passage, and is fixedly assembled in the transmission assembly, so that the rotary cutting blade and the wire feeding gear rotate synchronously.

The beneficial effects of the present invention are as follows: 1. Through the setting of the rotary cutting blade, the existing helical tooth structure is replaced to achieve the function of rotating and forwarding the 3D printing consumables; 2. The rotary cutting blade improves the existing structure. The defects of excessive friction stagnation or too small friction idling have low requirements on the positive and negative tolerances of the consumables, and can transport the consumables forward smoothly and reliably; 3. The rotary cutting blade wraps the consumables in it and acts on the consumables The peripheral side, so the consumables are more balanced in force, making the consistency of the consumables better after passing through the consumables driving channel.

The present invention also provides a 3D printing pen, which includes:

a pen body, which is provided with a conveying channel for consumables to pass through, and the pen body includes a nozzle;

a rotary wire feeding mechanism comprising a plurality of rotary cutting elements spaced apart from each other, wherein the plurality of rotary cutting elements are arranged to be driven to rotate to cut into the consumables, thereby feeding the consumables in the conveying channel to the nozzle delivery; and

The heating mechanism is used for heating and melting the consumable.

In some embodiments, the rotary wire feeding mechanism further includes a wire feeding motor, a wire feeding drive assembly, and a rotating base, the rotating base has a base channel for the consumables to pass through, and a plurality of the rotary cutting elements Connected to the rotating base, when the wire feeding motor is working, the rotating base is driven to rotate by the wire feeding transmission assembly, so as to drive a plurality of the rotary cutting elements to rotate.

In some embodiments, the wire feeding transmission assembly includes an input gear driven by the wire feeding motor and a wire feeding gear meshed with the input gear, wherein the rotating base is driven to rotate by the wire feeding gear .

In some embodiments, the wire feeding transmission assembly further includes a wire feeding pipe, and the wire feeding pipe rotates synchronously with the wire feeding gear to drive the rotating base to rotate synchronously.

In some embodiments, the wire feeding gear is sleeved on the outside of the wire feeding pipe, and when the input gear drives the wire feeding gear to rotate, the wire feeding pipe rotates synchronously with the wire feeding gear, And further drive the rotating base arranged in the wire feeding pipeline to rotate, so that each of the rotary cutting elements rotates.

In some embodiments, the wire feeding pipeline includes a connecting pipeline and a wire feeding pipeline connected to the connecting pipeline, and a connecting hole is formed in the connecting pipeline for accommodating the rotating base and the rotary cutting element .

In some embodiments, the heating mechanism further includes a stirring tube, and the wire feeding pipe is sleeved with the stirring pipe, so that when the connecting pipe is driven to rotate, the stirring pipe is driven to rotate, so that the The heating mechanism heats the melted consumables for stirring

In some embodiments, the wire feeding drive assembly further includes a holding element, the holding element has a middle through hole for the consumable to pass through, and the holding element holds the rotating base on all the connecting pipes. inside the connecting hole.

In some embodiments, the holding element includes a limiting portion and an extension portion, the extension portion has an outer surface, the connecting pipe of the wire feeding pipe has an inner surface, and the rotating base is clamped on the between the outer surface of the extension of the retaining element and the inner surface of the connecting conduit of the wire feeding conduit.

In some embodiments, the extension portion of the holding element has an end surface, and the end surface of the extension portion is pressed against the rotating base or the rotary cutting element.

In some embodiments, the connecting pipe has an end surface, and the stopper of the holding element is pressed against the end surface of the connecting pipe, so that the rotating base is firmly held on the connecting pipe. Inside.

In some embodiments, the wire feeding gear is sleeved on the outside of the wire feeding pipe, and when the input gear drives the wire feeding gear to rotate, the wire feeding pipe rotates synchronously with the wire feeding gear, And further drive the rotating base arranged outside the wire feeding pipeline to rotate, so as to rotate each of the rotary cutting elements. In some embodiments, the rotary base has a plurality of installation slots, and each of the rotary cutting elements is assembled in the corresponding installation slot of the rotary base. When the wire feeding motor is working, the The wire feeding transmission assembly drives the rotating base to rotate, so as to drive a plurality of the rotary cutting elements to rotate.

In some embodiments, the rotating wire feeding mechanism further includes a holding element, the holding element has a middle through hole for the consumable to pass through, and the holding element is sleeved on the outside of the rotating base, and includes A plurality of holding arms, each holding arm presses against the corresponding rotary cutting element.

In some embodiments, the holding element further includes a joint tube, and the heating mechanism includes a stirring tube, and the stirring tube is socketed with the joint tube, so that when the holding element is driven to rotate, the The stirring tube rotates to stir the consumable after being heated and melted by the heating mechanism

In some embodiments, the rotating wire feeding mechanism further includes a rotating base and a wire feeding motor, the wire feeding motor has a motor through hole, and a base channel is formed in the rotating base for the consumables to pass through A plurality of the rotary cutting elements are spaced apart from each other and extend on the rotating base, wherein the rotating base is arranged coaxially with the wire feeding motor and driven by the wire feeding motor.

In some embodiments, the wire feeding motor includes an output shaft, and the rotating base is coupled to the output shaft of the wire feeding motor to be driven by the wire feeding motor.

In some embodiments, the rotary wire feeding mechanism includes two rotary cutting elements arranged symmetrically about the center.

In some embodiments, the rotary wire feeding mechanism includes two rotary cutting elements, wherein the two rotary cutting elements are adapted to be arranged on opposite sides of the consumable, and the two rotary cutting elements The rotational force acting on the consumable is in the opposite direction to reduce the rotation of the consumable.

In some embodiments, the rotary wire feeding mechanism includes three rotary cutting elements, wherein the three rotary cutting elements are adapted to evenly surround the consumable.

In some embodiments, said plurality of said rotary cutting elements are arranged to cut obliquely into the contact surface of the consumable and form a helix angle ω.

In some embodiments, a plurality of said rotary cutting elements are arranged to cut perpendicularly into the contact surface of the consumable and form a helix angle ω.

In some embodiments, the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, D is the outer diameter of the consumable, and af is the cut-in amount, where the consumable Lead P=F/(n×π×(D/2)^2), where F is the extrusion volume of the consumable, n is the rotation speed of the wire feeding motor, and the range of the helix angle ω is 8.3° ≤ω≤45°.

In some embodiments, the 3D printing pen further includes a dyeing mechanism for dyeing the consumable, and the heating mechanism heats and melts the dyed consumable to output colored 3D printing materials.

In some embodiments, the dyeing mechanism includes a dye box, a dyeing part, and a dyeing drive mechanism, wherein the dyeing part is assembled in the dye box, and the dyeing part is driven by the dyeing drive mechanism to make the dyeing part At least a portion of contacting the consumable to dye the consumable.

In some embodiments, the dyeing mechanism includes a plurality of dyeing parts, and the dyeing driving mechanism is arranged to make at least a part of different dyeing parts contact the consumable, so as to switch the color of the consumable.

In some embodiments, the dyeing mechanism includes a dyeing motor, a dyeing drive assembly, and a dyeing drive. When the dyeing motor is started to work, the dyeing drive assembly driven by the dyeing motor moves to drive the dyeing drive. The piece moves to a position where the dyeing piece is pushed, so that at least a portion of the dyeing piece remains close to the consumable to dye the consumable.

In some embodiments, the dyeing mechanism includes a plurality of dyeing driving parts, the dyeing transmission assembly includes an output gear, a dyeing drive gear, a movable element and a fixed element, the output gear is coupled to the dyeing motor, The dyeing drive gear is meshed with the output gear, and the movable element is connected to the dyeing drive gear to move relative to the fixed element, so that the movable element and the fixed element cooperate to switch between different The dyeing driving part is used to push the corresponding dyeing part.

In some embodiments, the fixing element has a through hole, a plurality of perforations and a plurality of chutes, the through holes allow the consumables to pass through, and the plurality of through holes allow the corresponding plurality of dyeing pieces to pass through, When driven, the plurality of dyeing driving members slide along the corresponding plurality of chutes, wherein the plurality of through holes communicate with the corresponding chutes and the through holes in the middle respectively.

In some embodiments, when the movable element and the fixed element move relative to each other, one of the dyeing driving elements of the plurality of dyeing driving elements is allowed to move along its corresponding chute until the dyeing driving The piece reaches the position of the dyed piece pushed through the corresponding said perforation.

In some embodiments, the movable element has a passage hole for the consumable to pass through and a movable groove, the movable groove has a proximal region and a distal region, wherein the movable element and the fixed element create During relative movement, when one of the dyeing driving parts is driven to move along the active groove and moves to the adaxial area, the dyeing driving part slides along the corresponding chute at the same time, thereby using to push the dyed end of the corresponding dyed piece.

In some embodiments, each of the dyeing driving parts includes a sliding part and a rotating part, the sliding part is driven to slide along the corresponding chute, and the rotating part is driven to slide along the movable element. The movable slot rotates.

In some embodiments, the dyeing driving mechanism has a plurality of chutes, and each of the dyeing driving parts is driven to move along the corresponding chute so that at least a part of the dyeing part contacts the consumable, so as to Consumables for staining.

In some embodiments, the dyeing driving mechanism has an active slot, and the active slot has an adaxial area and an abaxial area, and when the dyeing driving member is driven to move to the adaxial area of the active slot, At the same time, it moves along the corresponding chute to make at least a part of the dyeing member contact the consumable, and when the dyeing driving member is driven to move to the abaxial area of the active groove, the dyeing driving member Stay away from the stained pieces.

The present invention also provides a rotary wire feeding mechanism applied to 3D printing equipment, which includes a plurality of rotary cutting elements spaced apart from each other, wherein the plurality of rotary cutting elements are arranged to be driven to rotate to cut into consumables and push the consumables .

The present invention also provides a wire feeding method for a 3D printing device, which includes the steps of: driving and rotating a plurality of rotary cutting elements to cut into consumables and push the consumables.

In some embodiments, in the method above, the consumable is propelled by a plurality of said rotary cutting elements obliquely cutting into the contact surface of the consumable, wherein a plurality of said rotary cutting elements form a helix angle when interacting with the consumable omega.

In some embodiments, in the method above, the consumable is propelled by a plurality of said rotary cutting elements perpendicularly cutting into the contact surface of the consumable, wherein a plurality of said rotary cutting elements interact with the consumable to form a helix angle omega.

In some embodiments, in the above method, the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, D is the outer diameter of the consumable, and af is the cut-in Amount, where, the consumable lead P=F/(n×π×(D/2)^2), where F is the extruded amount of the consumable, n is the speed of the wire feeding motor, and the range of the helix angle ω 8.3°≤ω≤45°.

In some embodiments, in the above method, the wire feeding drive assembly is driven by the wire feeding motor to drive the rotating base to rotate, thereby driving the plurality of rotary cutting elements to rotate.

In some embodiments, in the above method, the rotating base is driven to rotate by a wire feeding motor coaxially arranged with the rotating base, so as to drive a plurality of the rotary cutting elements to rotate.

The present invention also provides a method for outputting printing materials by a 3D printing pen, which includes the following steps:

(a) being driven to rotate by a plurality of rotary cutting elements to cut into the consumable and push the consumable to convey the consumable in the delivery channel to the nozzle; and

(b) heating the consumable to melt the consumable and output it from the nozzle.

Description of drawings

Fig. 1 is a schematic diagram of the overall assembly of the rotary wire feeding mechanism of the 3D printing device according to the first preferred embodiment of the present invention.

Fig. 2 is a cross-sectional view of the rotary wire feeding mechanism of the 3D printing device according to the first preferred embodiment of the present invention.

Fig. 3 is an exploded view of the rotary wire feeding mechanism of the 3D printing device according to the first preferred embodiment of the present invention.

Fig. 4 is a schematic diagram of the middle helix angle ω of the rotary wire feeding mechanism of the 3D printing device according to the first preferred embodiment of the present invention.

Fig. 5 is a structural schematic diagram of the rotary cutting blade of the rotary wire feeding mechanism of the 3D printing device in the first preferred embodiment having two interlocking elastic sheets.

Fig. 6 is a structural schematic diagram of the rotary cutting blade of the rotary wire feeding mechanism of the 3D printing device in the first preferred embodiment having three interlocking elastic pieces.

Fig. 7 is a perspective view of a 3D printing pen according to a second preferred embodiment of the present invention.

Fig. 8 is a sectional view along line A-A in Fig. 7 .

Fig. 9 is an exploded schematic view of the 3D printing pen according to the second preferred embodiment of the present invention.

Fig. 10 and Fig. 11 are further exploded schematic diagrams of the 3D printing pen according to the second preferred embodiment of the present invention.

Fig. 12 and Fig. 13 are exploded schematic diagrams illustrating the rotary filament feeding mechanism and the dyeing mechanism of the 3D printing pen according to the second preferred embodiment of the present invention.

Fig. 14 is an exploded view showing the rotary wire feeding mechanism of the 3D printing pen according to the second preferred embodiment of the present invention.

Fig. 15 is a structural schematic diagram illustrating the working state of the rotary wire feeding mechanism of the 3D printing pen according to the second preferred embodiment of the present invention.

Fig. 16 is a sectional view along line B-B in Fig. 15 .

FIG. 17 is a partially enlarged schematic view at point C in FIG. 16 .

Fig. 18 is a schematic diagram showing the helix angle generated by the filament feeding mechanism of the 3D printing pen according to the above-mentioned second preferred embodiment of the present invention in the working state.

Fig. 19A and Fig. 19B are three-dimensional schematic diagrams of the rotary cutting element and the rotary base of the rotary filament feeding mechanism of the 3D printing pen according to the second preferred embodiment of the present invention.

Fig. 19C is a side view of the rotary cutting element and the rotary base of the rotary wire feeding mechanism of the 3D printing pen according to the second preferred embodiment of the present invention.

Fig. 19D is an attached view of the rotary wire feeding mechanism of the 3D printing pen according to the second preferred embodiment of the present invention.

Fig. 20 is an exploded schematic diagram illustrating the movable elements and fixed elements of the dyeing mechanism of the 3D printing pen according to the second preferred embodiment of the present invention.

Fig. 21 and Fig. 22 are three-dimensional schematic diagrams illustrating the movable elements and fixed elements of the dyeing mechanism of the 3D printing pen according to the second preferred embodiment of the present invention when passing through the consumables.

Fig. 23A and Fig. 23B are three-dimensional schematic views illustrating the cooperation of the movable element and the fixed element of the dyeing mechanism of the 3D printing pen according to the second preferred embodiment of the present invention to dye the consumables.

Fig. 24 is a perspective view of a 3D printing pen according to a third preferred embodiment of the present invention.

Fig. 25 is a sectional view taken along line D-D in Fig. 24 .

Fig. 26 is an exploded schematic view of the 3D printing pen according to the third preferred embodiment of the present invention.

Fig. 27 is an exploded schematic view illustrating the rotary filament feeding mechanism and the dyeing mechanism of the 3D printing pen according to the third preferred embodiment of the present invention.

Fig. 28A is a schematic perspective view showing the rotary wire feeding mechanism of the 3D printing pen according to the third preferred embodiment of the present invention.

Fig. 28B is a cross-sectional view along line E-E of Fig. 28A.

Fig. 28C is a cross-sectional view taken along line F-F of Fig. 28A.

Fig. 29 is an exploded view illustrating the rotary wire feeding mechanism of the 3D printing pen according to the third preferred embodiment of the present invention.

Fig. 30 is an exploded schematic view illustrating the rotating base and holding elements of the rotating wire feeding mechanism of the 3D printing pen according to the third preferred embodiment of the present invention.

Fig. 31 and Fig. 32 are three-dimensional schematic diagrams illustrating the rotating base, the rotary cutting element and the holding element of the rotating wire feeding mechanism of the 3D printing pen according to the third preferred embodiment of the present invention.

Fig. 33 is a cut-away schematic perspective view illustrating the assembly of the rotating base, the rotary cutting element and the holding element of the rotating wire feeding mechanism of the 3D printing pen according to the third preferred embodiment of the present invention.

Fig. 34A, 34B, 34C and Fig. 34D are schematic diagrams illustrating the structure of the rotary cutting element of the rotary wire feeding mechanism of the 3D printing pen according to the above-mentioned third preferred embodiment of the present invention, which vertically cuts into the consumables, wherein Fig. 34C is along Fig. 34B Sectional view of line G-G.

Fig. 35 is a schematic perspective view showing the rotating filament mechanism of the 3D printing pen according to the third preferred embodiment of the present invention.

Fig. 36 is a sectional view taken along line H-H of Fig. 35 .

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Figures 1 to 6, a rotary wire feeding mechanism applied to 3D printing equipment includes a driving device 1, a transmission assembly, and a rotary cutting blade 2 arranged in sequence according to the transmission sequence, and the rotary cutting blade 2 has a drive channel for consumables 3 to wrap the consumables and transport the consumables 14 forward. The rotary cutting blade 2 includes a driven rotating base 4 and an engaging elastic sheet 5 inclined inwardly from the driven rotating base 4. The movable rotating base 4 forms a driving cooperation with the transmission assembly, and the engaging elastic piece 5 is at least partially obliquely cut into the consumable 14 to apply a propulsion force for the consumable 14 to move forward.

Wherein, the driven rotating base 4 and the engaging elastic piece 5 can be integrally formed, or can be formed separately and then assembled together.

In the above-mentioned structural solution, there is no special limitation on the number of engaging elastic pieces 5 , which may be one or multiple. Preferably, there are multiple snapping elastic sheets 5 arranged intermittently with each other. Using the above-mentioned preferred structural scheme, on the one hand, in terms of quantity, the force of a single form must have unbalanced defects, so the use of multiple can better act on the consumables and make the force more balanced; on the other hand, the existing The helical teeth are continuous, so after the thread of the current section causes the contact with the consumables to be too loose or too tight, the thread of the subsequent section will follow the path of the thread of the previous section and have the same problem, so multiple occlusal elastic sheets are used 5 The discontinuous arrangement between each other can make a plurality of interlocking elastic sheets 5 have a section with a large cutting amount when they act on the consumables, and there are also sections with a small cutting amount (the minimum is 0), and there is a difference in the cutting amount between the two. Larger, which in turn reduces the diameter tolerance requirements of consumables, and makes the effect of wire feeding drive better.

The number and arrangement of the engaging elastic sheets 5 are various, and several preferred methods are provided here: 1. There are two engaging elastic sheets 5 and they are symmetrically arranged around the center. 2. There are three occlusal elastic sheets 5 and they are evenly arranged at intervals of 120 degrees. 3. There are four occlusal elastic sheets 5 and they are evenly arranged at intervals of 90 degrees. In consideration of the effect of use and the difficulty of production and processing, the above three combinations are all better solutions.

The most critical point in the setting and use of the engaging elastic sheet 5 is that it can form a helix angle ω with the consumable. Specifically, the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, D is the outer diameter of the consumable, and af is the cut-in amount; among them, the lead of the consumable is P=F /(n×π×(D/2)^2), where F is the extruded amount of consumables, and n is the rotational speed of the driving device 1 .

For example, it is generally believed that the cut-in amount af is 0.3mm on one side, the outer diameter D of the filament is 1.75mm, and the extrusion volume F of the filament that is suitable for manual operation by the user is 76-860mm^3/min. Due to the driving torque The speed n of the driving device 1 needs to be decelerated to 60r/min, so it can be calculated according to the formula that the range of the helix angle is 8.3°≤ω≤58.8°. More preferably, considering that when the helix angle exceeds 45 degrees, according to the decomposition of the force, the forward thrust on the consumables will be less than the rotation force at this time, so the maximum angle is not recommended to exceed 45 degrees. In summary, it is best to control the helix angle range within 8.3°≤ω≤45°.

The specific physical structure of the engaging elastic sheet 5 is as follows: it has a short side 6 and a long side 7, and an inclined blade 80 connected between the short side 6 and the long side 7, and the inclined blade 80 is connected to the consumable The helix angle ω is formed between them.

In order to make the inclined blade 80 bite into the consumable more smoothly, the inclined blade 80 has a cutting surface 8 that gradually slopes outward from bottom to top.

The structural schemes of the transmission components are varied and not specifically limited. A preferred solution is proposed here, which specifically includes an input gear 9 driven by the driving device 1 and a wire feeding gear 10 meshing with the input gear 9, and the wire feeding gear 10 has a consumable material channel 11 through which the consumable material passes.

In order to realize the installation and rotation of the rotary cutting blade 2, it also includes a pressing block 12, the front end of the consumable material channel 11 has a connecting hole 13, and the pressing block 12 presses the driven rotating base 4 In the connection hole 13, the rotary cutting blade 2 and the wire feeding gear 10 rotate synchronously.

In actual work, a single piece of elastic sheet 5 has a small bite force on consumables. When multiple pieces of elastic sheet 5 act together on consumables, it can provide sufficient and effective bite force.

This embodiment of the present invention provides a rotary wire feeding mechanism applied to a 3D printing device, especially a small-sized 3D printing pen. The rotary cutting blade 2 with the obliquely arranged engaging elastic sheet body 5 is used to replace the existing driving structure such as helical teeth or screw drive, and the engaging elastic sheet body 5 is at least partially obliquely cut into the consumable to apply to the consumable to move forward propulsion. The unique advantage of the rotary cutting blade 2 is that it has low requirements on the consistency of the consumables, and even if the consumables themselves have different diameter tolerances, the engaging elastic sheet 5 can also bite in place to drive the consumables forward smoothly.

As shown in Figures 7 to 23 is a 3D printing device according to a second preferred embodiment of the present invention, which is implemented as a 3D printing pen in this embodiment, which includes a pen main body 100, a rotary wire feeding mechanism 200, a dyeing mechanism 300. The heating mechanism 400. The pen main body 100 includes a pen housing 110 and a nozzle 120, and has a conveying channel 130 arranged in the pen housing 110, and the rotating wire feeding mechanism 200 is used to make the consumables 500 flow in the conveying channel 130 to the The nozzle 120 conveys, and the dyeing mechanism 300 is used to dye the consumable 500. The heating mechanism 400 includes a heating element 410 to heat and melt the dyed consumable 500 that is forwarded to the nozzle 120, so that the The nozzles 120 output colored molten 3D printing materials.

In the 3D printing pen of the present invention, the consumable 500 is a solid hot-melt material, such as PLA (polylactic acid) material or ABS (acrylonitrile-butadiene-styrene copolymer) material, which is heated by the heating mechanism 400 The heating element 410 is heated and melted, and sprays out from the nozzle 120 at the front end of the pen body 100, and forms a 3D drawing after cooling.

12 to 19D, in this embodiment of the present invention, the rotary wire feeding mechanism 200 includes a plurality of rotary cutting elements 210 arranged at intervals along the circumferential direction, which can be driven to rotate and each of the rotary cutting elements 210 Cutting into the consumable 500 while rotating so that the consumable 500 is conveyed to the nozzle 120 in the conveying passage 130 or driving the consumable 500 backward in the conveying passage 130 when reversed.

When the consumable 500 is inserted into the conveying channel 130, a plurality of the rotary cutting elements 210 spaced apart from each other are adapted to be located around the consumable 500 to clamp the consumable 500, and the rotary cutting elements 210 When rotating, intermittent cut-in marks are formed on the outer peripheral surface of the consumable 500, and the cutting amounts of the plurality of rotary cutting elements 210 on the outer peripheral surface of the consumable 500 are different, so that continuous helical teeth can be avoided compared with continuous helical teeth. The teeth have the defects of excessive friction and stagnation or too little friction and idling. Moreover, the rotary wire feeding mechanism 200 of the present invention reduces the requirement on the diameter tolerance of the consumable 500 .

The rotating wire feeding mechanism 200 further includes a rotating base 220 , a wire feeding motor 230 and a wire feeding transmission assembly 240 , and a base channel 221 is formed in the rotating base 220 for the consumables 500 to pass through. The plurality of rotary cutting elements 210 arranged at intervals are connected to the rotary base 220 , wherein the plurality of rotary cutting elements 210 can be installed on the rotary base 220 or integrally formed with the rotary base 220 . In this embodiment, a plurality of the rotary cutting elements 210 are spaced apart from each other and integrally extend on the rotary base 220 .

Each rotary cutting element 210 is in the shape of a blade, one end of which extends integrally from the rotating base 220 , and the other end forms a cutting end 211 capable of cutting into the consumable 500 , and has a blade surface 2111 interacting with the consumable 500 . Each of the rotary cutting elements 210 is a rigid blade or an elastic sheet. When the wire feeding motor 230 is working, the rotating base 220 is driven to rotate by the wire feeding transmission assembly 240, so that the blade surface 2111 of each rotary cutting element 210 is in contact with the consumable material 500, so that The consumable 500 can be pushed forward or backward. In addition, the rotary cutting element 210 of this embodiment of the present invention is preferably elastic, and its arrangement allows the consumables 500 to directly push away the rotary cutting element 210 to reach the heating mechanism during the feeding preparation process. 400, unlike the existing gear or thread tooth wire feeding drive mechanism that will block the consumable 500 during the feeding preparation process, so it is necessary to additionally open the existing gear or thread tooth wire feed drive mechanism to work the consumable 500 The front end is inserted into the heating mechanism 400 .

More specifically, in this embodiment, the wire feeding transmission assembly 240 includes an input gear 241 , a wire feeding gear 242 and a wire feeding pipe 243 . The input gear 241 is coupled to the wire feeding motor 230 to be driven to rotate by the wire feeding motor 230 . The wire feeding gear 242 meshes with the input gear 241, and the wire feeding gear 242 is sleeved on the outside of the wire feeding pipe 243, so that the input gear 241 drives the wire feeding gear 242 to rotate, and the wire feeding gear 242 The wire feeding pipeline 243 rotates synchronously with the wire feeding gear 242, and further drives the rotation base 220 arranged in the wire feeding pipeline 243 to rotate, thereby rotating each rotary cutting element 210 and making The blade surface 2111 cuts into the consumable 500 to move the consumable 500 forward or backward.

The wire feeding pipe 243 includes a connecting pipe 2431 and a wire feeding pipe 2432 connected to the connecting pipe 2431 , the wire feeding pipe 2432 can be assembled in the connecting pipe 2431 or integrally formed with the connecting pipe 2431 . The connecting pipe 2431 has a larger inner diameter than the wire feeding pipe 2432 , and a connecting hole 2433 is formed therein for accommodating the rotating base 220 and the rotary cutting element 210 . In this embodiment, the cutting end of each rotary cutting element 210 cuts into the consumable 500 obliquely. The wire feeding transmission assembly 240 further includes a holding element 244, which can be implemented as a pressing block, and the holding element 244 has a middle through hole 2440 for the consumables 500 to pass through, and the holding element 244 holds the rotating base The seat 220 is held in the connecting hole 2433 of the connecting pipe 241 .

More specifically, the holding element 244 includes a limiting portion 2441 and an extension portion 2442, the extending portion 2442 integrally extends from the limiting portion 2441, the extending portion 2442 has an outer surface 24421 and an end surface 24422, the The end surface 24422 of the extension portion 2442 of the retaining element 244 presses against the rotating base 220 to keep the rotating base 220 in the connecting hole 2433 of the connecting pipe 241 .

In another embodiment, for example, in a structure similar to that shown in FIG. Between the inner surfaces 24311 of the connecting pipe 2431 of the wire feeding pipe 243 . The end surface 24422 of the extension part 2442 presses against the rotary cutting element 210 and adapts to the extended state of the rotary cutting element 210 to keep the rotary cutting element 210 in an inclined state.

As shown in Figures 15 to 17, the connecting pipe 2431 has an end surface 24312, and the stopper 2441 of the holding element 244 is pressed against the end surface 24312 of the connecting pipe 2431, so that the rotating base The seat 220 is firmly held in the connecting pipe 2431 to prevent the rotating base 220 from slipping out of the connecting hole 2433 of the connecting pipe 2431 . The holding element 244 keeps the outer surface of the rotating base 220 in contact with the inner surface 24311 of the connecting pipe 2431 of the wire feeding pipe 243 so as to pass through the wire feeding pipe 243 and the rotating base 243 . Friction can be generated between the bases 220, so that when the wire feeding pipe 243 rotates, the rotating base 220 is driven to rotate. The retaining element 244 can be elastic to further compress the rotating base 220 .

The rotating base 220 can be independent from the holding element 244 , and the rotating base 220 can also be fixed on the holding element 244 , for example, the rotating base 220 can be bonded to the holding element 244 . Alternatively, the rotary cutting element 210 , the rotating base 220 and the holding element 244 are integrally formed.

When the blade surface 2111 of each rotary cutting element 210 is in contact with the consumable material 500, the cutting helix 501 of the rotary cutting element 210 and the cylindrical end surface 502 of the consumable material 500 form a shape as shown in FIG. 18 The helix angle ω, where the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable 500, D is the outer diameter of the consumable, and af is the rotary cutting The cut-in amount of the element 210, wherein, the consumable lead P=F/(n×π×(D/2)^2), wherein F is the extruded amount of the consumable 500, and n is the rotation speed of the wire feeding motor 230 .

For example, it is generally believed that the cut-in amount af is 0.3mm on one side. The outer diameter D of the filament 500 is 1.75mm. The extrusion volume F of the filament suitable for manual operation by the user is 76-860mm^3/min. The reason for torque is that the speed n of the wire feeding motor 230 needs to be decelerated to 60r/min, so it can be calculated according to the formula that the range of the helix angle ω is 8.3°≤ω≤58.8°, which is more suitable. More preferably, considering that when the helix angle ω exceeds 45 degrees, according to the decomposition of the force, the forward thrust of the consumable 500 will be smaller than the rotation force at this time, so the maximum angle is not recommended to exceed 45 degrees. In summary, it is best to control the helix angle ω range to 8.3°≤ω≤45°.

In this embodiment of the present invention, the rotary wire feeding mechanism 200 includes a plurality of rotary cutting elements 210 to hold the consumable 500 and cut into the consumable 500 when rotating to deliver the consumable 500 to the nozzle 120 . For example, in this embodiment, the rotary wire feeding mechanism 200 includes two rotary cutting elements 210, which are evenly distributed around the consumables 500 in the working state, and each rotary cutting element 210 is inclined Cut into the surface of the consumable 500 . It can be understood that the number of the rotary cutting elements 210 may be 2, 3, 4 or more. The rotary cutting elements 210 are suitable to be evenly distributed around the consumable 500 and transport the consumable 500 to the nozzle 120 smoothly and reliably.

As shown in FIG. 19A to FIG. 19D , in this embodiment, the cutting end 211 of each rotary cutting element 210 is triangular in shape, so as to facilitate cutting into the consumable 500 from its sharp apex. And each of the rotary cutting elements 210 includes a short side 2112 , a long side 2113 and an inclined cutting edge 2110 extending between the short side 2112 and the long side 2113 . The blade surface 211 of the blade 2110 extends obliquely between the short side 2112 and the long side 2113, which is suitable for cutting into the consumable 500 when the rotary cutting element 210 rotates, and forms the above-mentioned spiral Angle ω. In addition, the short side 2112 of one rotary cutting element 210 and the long side 2113 of the other rotary cutting element 210 are adjacent and spaced apart.

In addition, in this embodiment of the present invention, the rotary wire feeding mechanism 200 further includes an anti-rotation element 250 for counteracting the rotational force of the rotary cutting element 210 and the consumable 500 . In this embodiment, the anti-rotation element 250 is embodied with a curved channel 251 . When the rotary cutting element 210 of the present invention drives the consumable to move forward, its force also drives the consumable 500 to rotate, and the inner surface of the curved channel 251 of the anti-rotation element 250 can reduce the The effect of the rotation of the consumable 500 .

In addition, in this embodiment of the present invention, as shown in Figures 11 to 13 and Figures 20 to 23, the 3D printing pen further includes the dyeing mechanism 300 for dyeing the consumable 500. That is, the consumable 500 may be a transparent consumable, which becomes a colored consumable after being dyed by the dyeing mechanism 300 , and is heated and melted by the heating mechanism 400 to form a colored fused 3D drawing material.

More specifically, the dyeing mechanism 300 of the 3D printing pen includes a dye box 310 , a dyeing piece 320 , and a dyeing driving mechanism 330 . The dye box 310 has one or more dye chambers 311 and storage units 312 stored in the corresponding dye chambers 311 , the storage units 312 include color dyes and ink storage sponges or polymer polyurethane. Each of the dyeing parts 320 is plugged into the dye box 310 , the colored dye can penetrate into the dyeing parts 320 , the dyeing parts 320 are elastic, and the dyeing parts 320 can be made of fiber rods.

In this embodiment, the dyeing drive mechanism 330 is used to drive the dyeing piece 320 so that at least a part of the dyeing piece 320 can contact and move away from the consumable 500, so that at least a part of the dyeing piece 320 is in contact with the consumable When the 500 is in contact with each other, the surface of the consumable 500 can be coated with the color dye to be dyed.

More specifically, the dyeing driving mechanism 330 includes a dyeing motor 331 , a dyeing transmission assembly 332 , and a dyeing driving member 333 . When the dyeing motor 331 is started to work, the dyeing transmission assembly 332 is driven to move to the position where the dyeing drive part 333 can push the dyeing part 320. At this time, the dyeing motor 331 stops working, so that At least a part of the dyeing piece 320 is kept close to the consumable 500 to dye the consumable 500 . When the dyeing motor 331 reverses, the dyeing drive assembly 322 drives the dyeing drive element 333 to move away from the dyeing piece 320, so that the dyeing piece 320 is away from the consumable 500, so that the current dyeing piece is stopped. 320 performs a dyeing operation on the consumable 500 .

In this embodiment of the present invention, the dyeing mechanism 300 includes a plurality of dyeing parts 320, and correspondingly, the dye box 310 has a plurality of dye chambers 311 and includes a plurality of dye chambers stored in corresponding dye chambers. The storage unit 312 of 311, a plurality of storage units 312 store color dyes of different colors. In this way, the dyeing mechanism 300 of the present invention can dye the consumables 500 in different colors. Correspondingly, the dyeing driving mechanism 330 can switch between different dyeing parts 320 , so that the consumable 500 can contact different dyeing parts 320 .

More specifically, the dyeing mechanism 300 includes a plurality of dyeing drive members 333, the dyeing transmission assembly 332 includes an output gear 3321, a dyeing drive gear 3322, a movable element 3323 and a fixed element 3324, and the output gear 3321 is coupled to In the dyeing motor 331, the dyeing drive gear 3322 meshes with the output gear 3321, and the movable element 3323 is connected to the dyeing drive gear 3322 to move relative to the fixed element 3324, so that the The movable element 3323 cooperates with the fixed element 3324 to be able to switch the different dyeing driving parts 333 to push the corresponding dyeing parts 320, so that different dyeing parts 320 can be switched to dye the consumables 500 in different ways. color.

The fixing element 3324 has a through hole 33241, a plurality of perforations 33242 and a plurality of chute 33243, the through hole 33241 is for the consumable 500 to pass through, and the plurality of perforation holes 33242 are respectively for the corresponding plurality of the dyeing pieces 320 to pass through. Through this, a plurality of the dyeing driving parts 333 can slide along the corresponding plurality of the sliding slots 33243, wherein the plurality of the through holes 33242 are respectively communicated with the corresponding sliding slots 33243 and the through holes 33241 in the middle . The plurality of chutes 33243 radially extend along the radial direction, so as to limit the moving tracks of the corresponding plurality of dyeing driving members 333 to the radial direction of the fixing element 3324 .

As shown in Figures 21 to 23B, when the movable element 3323 and the fixed element 3324 move relative to each other, one of the dyeing driving elements 333 can be allowed to move along its corresponding The chute 33243 moves until the dyeing driving member 333 reaches the position that can push the dyeing member 320 through the corresponding perforation 33242 and remains in this position, so that a dyeing end 321 of the corresponding dyeing member 320 Approaching and touching the consumable 500 causes the consumable 500 to be dyed.

When the movable element 3323 and the fixed element 3324 continue to move relative to each other, the current dyeing driving member 333 moves along the corresponding chute 33243 to a position away from the corresponding dyeing member 320, and the other The dyeing driving member 333 moves along its corresponding chute 33243 to a position capable of pushing the dyeing member 320 passing through the corresponding perforation 33242 and remains in this position, so that all the dyeing members 320 of the other dyeing member 320 The dyeing end 321 approaches and touches the consumable 500 , so that the consumable 500 is dyed in another color, thereby realizing the dyeing switch of the consumable 500 .

The movable element 3323 has a passage hole 33231 and a movable groove 33232, the passage hole 33231 allows the consumable 500 to pass through, the movable groove 33232 has a proximal region 33232a and a distal region 33232b, and the proximal region 33232a passes through The central axis X of the passage hole 33231 of the movable element 3323 is relatively close, and the proximal area 33232b is farther from the central axis X of the passage hole 33231 passing through the movable element 3323 . When the movable element 3323 and the fixed element 3324 move relative to each other, when the dyeing driver 333 is driven to move along the movable groove 33232 and move to the proximal region 33232a, the dyeing driver The piece 333 slides along the corresponding slide groove 33243 at the same time, so as to push the dyeing end 321 of the corresponding dyeing piece 320 . Wherein when the movable element 3323 and the fixed element 3324 continue to move relative to each other, the above-mentioned dyeing driving element 333 capable of pushing the corresponding dyeing element 320 leaves the adaxial area 33232a and reaches the abaxial area 33232b, so that the dyeing driving part 333 currently used to drive dyeing is kept away from the corresponding dyeing part 320, so that the dyeing part 320 currently used for dyeing operation returns to its original state by its own elasticity and is far away from the dyeing part 320 consumables. And when another said dyeing driving part 333 comes to said proximal region 33232a, it can slide along its corresponding said chute 33243 so that said dyeing end 321 of another said dyeing part 320 is connected with the consumable 500, so that the consumable 500 is dyed another color.

In this embodiment, the movable element 3323 is driven to rotate by the dyeing motor 331 , the output gear 3321 and the dyeing driving gear 3322 , so that the movable slot 33232 is a rotating slot. Each of the dyeing driving parts 333 includes a sliding part 3331 and a rotating part 3332, the sliding part 3331 can slide along the corresponding chute 33243, the rotating part 3332 is connected to the sliding part 3331, and along the Rotate the movable groove 33232 of the movable element 3323 so as to be able to reach or stay away from the proximal region 33232a of the movable groove 33232, so that the corresponding dyeing driving member 333 is in the dyeing working state or leaves its dyeing state. working state, and can realize the color-changing dyeing operation of the consumable 500.

In order to make the structure of the 3D printing pen more compact, the wire feed motor 230 of the rotary wire feed mechanism 200 and the dyeing motor 331 of the dyeing mechanism 300 are arranged side by side, and the wire feed motor 231 of the rotary wire feed mechanism 200 The wire feeding driving position and the dyeing position of the dyeing mechanism 300 are respectively located on opposite sides of the wire feeding motor 230 and the dyeing mechanism 300 . When the consumables 500 are conveyed to the nozzle 120, they may first contact the rotary cutting element 210 to be driven forward by the rotary wire feeding mechanism 200 and reach the dyeing piece 320 of the dyeing mechanism 300. The position of the dyed end 321 is dyed. It is also possible that the consumables 500 can be dyed by the position of the dyeing end 321 of the dyeing part 320 of the dyeing mechanism 300, and then contact the rotary cutting element 210 to be dyed by the rotary wire feeding mechanism 200. It is driven to move forward and reaches the heating mechanism 400 to be heated and melted.

In addition, the heating mechanism 400 further includes a stirring tube 420 , which is made of metal and is socketed with the wire feeding pipe 2432 , and the stirring tube 420 extends into the nozzle 120 of the pen main body 100 . When the wire feeding pipe 2432 is driven to rotate, it drives the stirring tube 420 to rotate, so as to stir the filament 500 heated and melted by the heating element 410, so as to make the dyeing more uniform. The wire feeding pipe 2432 can be made of plastic material to prevent the consumable from melting before reaching the heating mechanism 400 .

The pen body 100 may also include a housing housing 150, which may include a two-part housing 151, which are assembled and used to firmly install the wire feeding motor 230 of the rotating wire feeding mechanism 200 and the dyeing mechanism. 300 of the dyeing motor 331.

In addition, each of the dyeing driving parts 333 is implemented as a slider in this embodiment, and the sliding part 3331 also has an arc-shaped limiting groove 3333 for making all the corresponding dyeing parts 320 The dyeing end 321 is limited in the limiting groove 3333, so that the dyeing driving part 333 can be aligned with the dyeing end 321 of the dyeing part 320 for pushing operation and avoids the corresponding dyeing part 320 Unnecessary offset movement.

It can be understood that the dyeing mechanism 300 in this embodiment of the present invention is only an example, and those skilled in the art can understand that the dyeing mechanism 300 can have other suitable structures. For example, the dyeing mechanism 300 is respectively used to drive a plurality of sliders to act on the dyeing parts 320 through a plurality of motors, so that one or more of the dyeing parts 320 can be in contact with the consumables 500 at the same time; or the dyeing The mechanism 300 does not need the above-mentioned dyeing motor 331, but drives the dyeing drive member 333 through a manual driving structure; The member 320 moves so as to contact and move away from the consumable 500 and realize the color changing operation.

The pen main body 100 further includes a control assembly 140, which includes a power supply module 141, a circuit control board 142 and other components to control the rotary wire feeding mechanism 200, the dyeing mechanism 300 and the heating mechanism 400. operate. The control assembly 140 also includes an operation button 143 to control the feeding and unloading operations of the rotary wire feeding mechanism 200 . The control assembly 140 also includes a color-changing dial 144 for activating the dyeing driving mechanism 330 of the dyeing mechanism 300 to perform a color-changing operation.

The conveying channel 130 of the pen body 100 is formed by a separate pipe, or formed by through holes formed by the rotary wire feeding mechanism 200 , the dyeing mechanism 300 and the heating mechanism 400 .

As shown in Figure 24 to Figure 34D is a 3D printing device according to a third preferred embodiment of the present invention, which is implemented as a 3D printing pen in this embodiment, which includes a pen main body 100, a rotary wire feeding mechanism 200A, a dyeing mechanism 300. The heating mechanism 400. Similarly, the pen main body 100 includes a pen housing 110 and a nozzle 120, and has a conveying channel 130 disposed on the pen housing 110, and the rotary wire feeding mechanism 200A is used to make the consumables 500 pass through the conveying channel 130 The dyeing mechanism 300 is used to dye the consumable 500, and the heating mechanism 400 includes a heating element 410 to heat and melt the dyed consumable 500 that is forwarded to the nozzle 120. , so that the nozzle 120 outputs colored molten 3D drawing material.

In this embodiment, the rotary wire feeding mechanism 200A includes a plurality of rotary cutting elements 210A arranged at intervals along the circumferential direction, which can be driven to rotate, and each rotary cutting element 210A cuts into the consumable 500 while rotating to When the consumable 500 is conveyed to the nozzle 120 in the conveying passage 130 or reversed, the consumable 500 is driven backward in the conveying passage 130 .

The rotating wire feeding mechanism 200A further includes a rotating base 220A, a wire feeding motor 230A and a wire feeding drive assembly 240A, and a base channel 221A is formed in the rotating base 220A for the consumables 500 to pass through. The plurality of rotary cutting elements 210A spaced apart from each other are assembled on the rotating base 220A.

Each of the rotary cutting elements 210A is blade-shaped, has a cutting end 211A capable of cutting into the consumable material 500 , and has a blade surface 2111A that interacts with the consumable material 500 . Each of said rotary cutting elements 210A is a rigid blade, and preferably, it is resilient. When the wire feeding motor 230A is working, the rotating base 220A is driven to rotate by the wire feeding transmission assembly 240A, so that the blade surface 2111A of each rotary cutting element 210A is in contact with the consumable material 500, so that The consumable 500 can be pushed forward or backward.

More specifically, in this embodiment, the wire feeding drive assembly 240A includes an input gear 241A, a wire feeding gear 242A and a retaining element 244A. The input gear 241A is coupled to the wire feeding motor 230A to be driven to rotate by the wire feeding motor 230A. The wire feeding gear 242A meshes with the input gear 241A, and the wire feeding gear 242A is sleeved on the outside of the rotating base 220A, so that the input gear 241A drives the wire feeding gear 242A to rotate, and the wire feeding gear 242A The rotating base 220A rotates synchronously with the wire feeding gear 242A, so that each rotary cutting element 210A rotates, and the blade surface 2111A cuts into the consumable 500 to move the consumable 500 forward or backward.

In this embodiment, the rotating base 220A of the rotating wire feeding mechanism 200A has a plurality of installation slots 222A for assembling corresponding plurality of the rotary cutting elements 210A. At least one extending rib 223A extends from the outer side of the rotating base 220A along its length direction. The holding element 244A is sheathed on the outside of the rotating base 220A, and has a middle through hole 2440A, and at least one set of driving ribs 2443A extends in the middle through hole 2440A, and the set of driving ribs 2443A includes two Two driving ribs 2443A spaced apart from each other and parallel to each other form an engaging groove 2444A therebetween to engage with the extending rib 223A of the rotating base 200A, so that the holding element 244A and the rotating base 220A can rotate synchronously. More specifically, in this embodiment, the spin base 200A includes two of the extending ribs 223A on opposite sides, and the holding member 244A includes two sets of the driving ribs 2443A and has two of the engaging grooves. 2444A.

In addition, in this embodiment, the holding element 244A further includes a plurality of holding arms 2445A extending toward the middle through hole 2440A, such as two holding arms 2445A, which are pressed against the corresponding rotary cutting element 210A, so that the rotary cutting element 210A can keep cutting into the consumable 500 vertically. The holding arm 2445A of this embodiment of the present invention is preferably elastic, and it is elastically pressed against the rotary cutting element 210A, and its arrangement allows the consumable 500 to directly push away the rotary cutting element during the loading preparation process. element 210 to make it reach the heating mechanism 400, unlike the existing gear or screw tooth wire feeding drive mechanism that will block the consumables 500 during the feeding preparation process, thus requiring additional opening of the existing gear or screw tooth feeding drive mechanism. The front end of the consumable 500 can be inserted into the heating mechanism 400 only when the wire driving mechanism works.

In addition, in this embodiment, the holding element 244A also includes a joint pipe 2446A at the front end, which is socketed with the stirring tube 420 for the consumables 500 to pass through, and cut into the consumables at the rotary cutting element 210A. 500 to push the consumable 500 forward to heat and melt the heating element 410 of the heating mechanism 400 , the stirring tube 520 further synchronously rotates the holding element 244 to stir the melted consumable 500 . The stirring tube 420 is made of metal, and the connecting pipe 2446A can be made of plastic, so as to prevent the consumable from melting before reaching the heating mechanism 400 .

In this embodiment, the rotary wire feeding mechanism 200A includes two rotary cutting elements 210A, and the blade surface 2111A of each rotary cutting element 210A is in contact with the consumable 500 so that the rotary cutting element 210A is in the The cut-in helix 501 of the consumable 500 and the cylindrical end surface of the consumable 500 form the helix angle ω shown in FIG. 18 above, wherein the range of the helix angle ω is optimally controlled within 8.3°≤ω≤45°.

In addition, in this embodiment, each of the rotary cutting elements 210A vertically cuts into the surface of the consumable 500, and the blade surface 2111A of each of the rotary cutting elements 210A extends obliquely, and each of the rotary cutting elements 210A The blade surface 2111A forms an included angle with the central axis of the consumable 500 , so as to form the aforementioned helix angle ω.

That is to say, as shown in FIG. 34A to FIG. 34D , taking the horizontal movement of the consumable 500 as an example, each of the rotary cutting elements 210A is kept so as to be able to cut into the consumable 500 perpendicular to the horizontal plane. After each of the rotary cutting elements 210A cuts into the consumable 500, the blade surface 2111A of each of the rotary cutting elements 210A meets the central axis of the consumable 500 in the horizontal plane and forms an included angle, so that each of the rotary cutting elements 210A forms the aforementioned helix angle ω when the consumable 500 is pushed. In the first embodiment above, taking the horizontal movement of the consumable 500 as an example, each of the rotary cutting elements 210 is kept so as to be able to cut into the consumable 500 at a first angle forming an acute angle with the horizontal plane. After each rotary cutting element 210 cuts into the consumable material 500, the blade surface 2111 of each rotary cutting element 210 meets the central axis of the consumable material 500 in the horizontal plane and forms a second acute angle, so that each When the rotary cutting element 210 pushes the consumable 500, it forms the above-mentioned helix angle ω.

In this embodiment, each of the rotary cutting elements 210A cuts into the surface of the consumable 500 vertically, so as to further prevent the consumable 500 from tilting and moving unnecessary when being cut by the rotary cutting element 210A, Therefore, the consumable material 500 can move forward smoothly and reliably.

In addition, referring to FIG. 34A to FIG. 34D , because when the rotary cutting element 210A pushes the consumable 500 to move forward, its thrust may also generate a component force in the direction of rotation of the consumable 500 . In this embodiment of the present invention, the rotary wire feeding mechanism 200B includes two rotary cutting elements 210A, and the two rotary cutting elements 210A are adapted to be located on opposite sides of the consumable to push the consumable, and The blade surfaces 2111A of the two rotary cutting elements 210A extend obliquely, so that the rotational force of the two rotary cutting elements 210A on the consumable material 500 is opposite, thereby reducing the rotational force on the consumable material 500 . Preferably, the two rotary cutting elements 210A are arranged such that their blade surfaces 2111A counteract the rotational force of the consumable 500, so that when the two rotary cutting elements 210A rotate and cut into the consumable 500, they can maintain The consumable 500 is pushed forward without rotational deflection.

As shown in Figures 35 to 36, it is a 3D printing device according to a fourth preferred embodiment of the present invention, which is implemented as a 3D printing pen in this embodiment, which includes a pen main body 100, a rotating filament feeding mechanism 200B, a dyeing Mechanism 300, heating mechanism 400. Similarly, the pen main body 100 includes a pen housing 110 and a nozzle 120 , and has a conveying channel 130 disposed on the pen housing 110 , and the rotary wire feeding mechanism 200B is used to make the consumable 500 flow in the conveying channel 130 The dyeing mechanism 300 is used to dye the consumable 500, and the heating mechanism 400 includes a heating element 410 to heat and melt the dyed consumable 500 that is forwarded to the nozzle 120. , so that the nozzle 120 outputs colored molten 3D drawing material.

In this embodiment, the rotary wire feeding mechanism 200B includes a plurality of rotary cutting elements 210B arranged at intervals along the circumferential direction, which can be driven to rotate, and each rotary cutting element 210B cuts into the consumable 500 while rotating to When the consumable 500 is conveyed to the nozzle 120 in the conveying passage 130 or reversed, the consumable 500 is driven backward in the conveying passage 130 .

The rotating wire feeding mechanism 200B further includes a rotating base 220B and a wire feeding motor 230B. A base channel 221B is formed in the rotating base 220B for the consumables 500 to pass through. The plurality of rotary cutting elements 210B spaced apart from each other are spaced apart from each other and integrally extend on the rotating base 220B.

In this embodiment, the wire feeding motor 230B has a motor through hole 231B and includes an output shaft 232B, the motor through hole 231B extending through the output shaft 232B as a part of the delivery channel 130 . That is to say, the consumable 500 can pass through the wire feeding motor 230B. The rotating base 220B can be directly coupled to the output shaft 232B of the wire feeding motor 230B to be driven to rotate by the wire feeding motor 230B.

In this embodiment, the rotating wire feeding mechanism 200B may further include a holding element 244B, and the rotating base 220B is sleeved on the outside of the output shaft 232B of the wire feeding motor 230B. The structure of the holding element 244B is similar to that of the holding element 244A in the above embodiment, it is sleeved on the outside of the rotating base 220B, and holds the rotary cutting element 10B to be able to vertically cut into the consumable 500 .

In this embodiment of the present invention, the rotating base 220B is arranged coaxially with the wire feeding motor 230B, thereby reducing the transmission structure for driving the rotating base 220B and making the structure of the 3D printing pen more compact , smaller in size.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still belong to the technical aspects of the present invention. within the scope of protection of the scheme.

Claims (90)

A 3D printing device, characterized in that it includes a rotary wire feeding mechanism, wherein the rotary wire feeding mechanism includes a driving device, a transmission assembly, and a rotary cutting blade arranged in sequence according to a transmission sequence, and the rotary cutting blade has a drive channel for consumables To wrap the consumables and transport the consumables forward, wherein the rotary cutting blade includes a driven rotating base and an engaging elastic sheet that is inclined inwardly from the driven rotating base, and the driven rotating base and The transmission assembly forms a transmission fit, and the engaging elastic sheet is at least partially obliquely cut into the consumable to apply a propulsion force for the consumable to move forward. The application to 3D printing equipment according to claim 1, wherein there are multiple interlocking elastic sheets arranged intermittently with each other. The application to 3D printing equipment according to claim 2, wherein there are two snapping elastic sheets arranged symmetrically about the center. The application to 3D printing equipment according to claim 2, wherein there are 3 snapping elastic sheets and they are evenly arranged at intervals of 120 degrees. The 3D printing device according to claim 1, wherein a helix angle ω is formed between the engaging elastic sheet and the consumable. The application to 3D printing equipment according to claim 5, wherein said engaging elastic sheet has a short side and a long side, and an inclined blade connected between the short side and the long side, the inclined blade The helix angle ω is formed between the consumables. The application to 3D printing equipment according to claim 6, wherein the inclined blade has a cutting surface that gradually slopes outward from bottom to top. Applied to 3D printing equipment according to claim 5, wherein the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, D is the outer diameter of the consumable, and af is Cut-in amount; wherein, the consumable lead P=F/(n×π×(D/2)^2), wherein F is the extruded amount of the consumable, and n is the rotational speed of the driving device. The application to 3D printing equipment according to claim 1, wherein the transmission assembly includes an input gear driven by a driving device, a wire feed gear meshed with the input gear, and the wire feed gear has a consumable material channel through which the consumable material passes . The application to 3D printing equipment according to claim 1, further comprising that the rotary cutting blade is coaxial with the consumable channel, and is fixedly assembled in the transmission assembly, so that the rotary cutting blade and the wire feeding gear rotate synchronously. A 3D printing pen is characterized in that it comprises: a pen body, which is provided with a conveying channel for consumables to pass through, and the pen body includes a nozzle; a rotary wire feeding mechanism comprising a plurality of rotary cutting elements spaced apart from each other, wherein the plurality of rotary cutting elements are arranged to be driven to rotate to cut into the consumables, thereby feeding the consumables in the conveying channel to the nozzle delivery; and The heating mechanism is used to heat and melt the consumable. The 3D printing pen according to claim 11, wherein the rotating wire feeding mechanism further comprises a wire feeding motor, a wire feeding transmission assembly and a rotating base, and the rotating base has a base channel for the consumable to pass through, and more Each of the rotary cutting elements is connected to the rotary base, and when the wire feeding motor is working, the rotary base is driven to rotate by the wire feeding transmission assembly, so as to drive a plurality of the rotary cutting components to rotate. The 3D printing pen according to claim 12, wherein the wire feeding transmission assembly includes an input gear driven by the wire feeding motor and a wire feeding gear meshed with the input gear, wherein the rotating base is driven by the The wire feeding gear is driven to rotate. The 3D printing pen according to claim 13, wherein the wire feeding transmission assembly further includes a wire feeding pipe, and the wire feeding pipe rotates synchronously with the wire feeding gear to drive the rotating base to rotate synchronously. The 3D printing pen according to claim 14, wherein the wire feeding gear is sleeved on the outside of the wire feeding pipeline, and when the input gear drives the wire feeding gear to rotate, the wire feeding pipeline is synchronized with the wire feeding pipeline. The wire feeding gear rotates, and further drives the rotating base arranged in the wire feeding pipeline to rotate, so that each of the rotary cutting elements rotates. The 3D printing pen according to claim 15, wherein the wire feeding pipeline includes a connecting pipeline and a wire feeding pipeline connected to the connecting pipeline, and a connecting hole is formed in the connecting pipeline for accommodating the rotating base and the rotary cutting element. The 3D printing pen according to claim 16, wherein the heating mechanism further comprises a stirring tube, and the wire feeding pipe is socketed with the stirring pipe, so that when the connecting pipe is driven to rotate, the stirring pipe is driven Rotate to stir the consumables that have been heated and melted by the heating mechanism. The 3D printing pen according to claim 16, wherein the wire feeding drive assembly further comprises a holding element, the holding element has a middle through hole for the consumable to pass through, and the holding element holds the rotating base at In the connecting hole of the connecting pipe. The 3D printing pen according to claim 18, wherein the holding element comprises a limiting part and an extension part, the extension part has an outer surface, the connecting pipe of the wire feeding pipe has an inner surface, and the rotating base A seat is clamped between the outer surface of the extension of the retaining element and the inner surface of the connecting conduit of the wire feed conduit. The 3D printing pen according to claim 18, wherein the extension part of the holding element has an end surface, and the end surface of the extension part is pressed against the rotating base or the rotary cutting element. The 3D printing pen according to claim 20, wherein the connecting pipe has an end face, and the stopper of the holding element is pressed against the end face of the connecting pipe, so that the rotating base is stabilized remain within the connecting pipe. The 3D printing pen according to claim 14, wherein the wire feeding gear is sleeved on the outside of the wire feeding pipeline, and when the input gear drives the wire feeding gear to rotate, the wire feeding pipeline is synchronized with the wire feeding pipeline. The wire feeding gear rotates, and further drives the rotating base arranged outside the wire feeding pipeline to rotate, so that each of the rotary cutting elements rotates. The 3D printing pen according to claim 13, wherein the rotating base has a plurality of installation grooves, each of the rotary cutting elements is assembled in the corresponding installation groove of the rotating base, and the wire feeding motor works At this time, the rotating base is driven to rotate by the wire feeding transmission assembly to drive a plurality of rotary cutting elements to rotate. The 3D printing pen according to claim 23, wherein the rotating wire feeding mechanism further includes a holding element, the holding element has a middle through hole for the consumable to pass through, and the holding element is sleeved on the rotating base The outer side of the seat, and includes a plurality of holding arms, and each of the holding arms is pressed against the corresponding rotary cutting element. The 3D printing pen according to claim 24, wherein the holding element further includes an engaging tube, the heating mechanism includes an agitating tube, and the agitating tube is socketed with the engaging tube, so that the holding element is driven to When rotating, the stirring tube is driven to rotate to stir the consumables heated and melted by the heating mechanism. The 3D printing pen according to claim 11, wherein the rotating wire feeding mechanism further comprises a rotating base and a wire feeding motor, the wire feeding motor has a motor through hole, and a base channel is formed in the rotating base, For the consumable to pass through, a plurality of the rotary cutting elements are spaced apart from each other and extend on the rotating base, wherein the rotating base is arranged coaxially with the wire feeding motor and driven by the wire feeding motor. The 3D printing pen according to claim 26, wherein the wire feeding motor includes an output shaft, and the rotating base is coupled to the output shaft of the wire feeding motor to be driven by the wire feeding motor. The 3D printing pen according to any one of claims 11 to 27, wherein the rotary wire feeding mechanism comprises two rotary cutting elements arranged symmetrically to the center. The 3D printing pen according to any one of claims 11 to 27, wherein the rotary filament feeding mechanism comprises two rotary cutting elements, wherein the two rotary cutting elements are adapted to be arranged on opposite sides of the consumable side, and make the direction of the rotational force of the two rotary cutting elements on the consumable material opposite, so as to reduce the rotation of the consumable material. The 3D printing pen according to any one of claims 11 to 27, wherein the rotary filament feeding mechanism comprises three rotary cutting elements, wherein the three rotary cutting elements are suitable to evenly surround the filament. A 3D printing pen according to any one of claims 12 to 27, wherein a plurality of said rotary cutting elements are arranged to cut obliquely into the contact surface of the consumable and form a helix angle ω. The 3D printing pen according to any one of claims 12 to 27, wherein a plurality of said rotary cutting elements are arranged to cut perpendicularly into the contact surface of the consumable and form a helix angle ω. The 3D printing pen according to claim 31, wherein the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, D is the outer diameter of the consumable, and af is Cutting amount, wherein, consumable material lead P=F/(n×π×(D/2)^2), wherein F is the extruded amount of the consumable material, n is the rotation speed of the wire feeding motor, and the helix The range of angle ω is 8.3°≤ω≤45°. The 3D printing pen according to claim 32, wherein the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, D is the outer diameter of the consumable, and af is Cutting amount, wherein, consumable material lead P=F/(n×π×(D/2)^2), wherein F is the extruded amount of the consumable material, n is the rotation speed of the wire feeding motor, and the helix The range of angle ω is 8.3°≤ω≤45°. The 3D printing pen according to any one of claims 11 to 27, further comprising a dyeing mechanism for dyeing the consumable, and the heating mechanism heats and melts the dyed consumable to output colored 3D printing materials. The 3D printing pen according to claim 35, wherein the dyeing mechanism comprises a dye box, a dyeing part and a dyeing drive mechanism, wherein the dyeing part is assembled in the dye box, and the dyeing part is driven by the dyeing drive mechanism And at least a part of the dyeing piece contacts the consumable to dye the consumable. The 3D printing pen according to claim 36, wherein said dyeing mechanism includes a plurality of said dyeing parts, and said dyeing driving mechanism is arranged to make at least a part of different said dyeing parts contact with the consumable, so that the consumable Perform a color change. The 3D printing pen according to claim 37, wherein the dyeing mechanism includes a dyeing motor, a dyeing transmission assembly and a dyeing drive, wherein when the dyeing motor is started to work, the dyeing transmission assembly driven by the dyeing motor moves The dyeing driving member is driven to move to a position for pushing the dyeing piece, so that at least a part of the dyeing piece is kept close to the consumable, so as to dye the consumable. The 3D printing pen according to claim 38, wherein said dyeing mechanism includes a plurality of said dyeing driving parts, said dyeing transmission assembly includes an output gear, a dyeing drive gear, a movable element and a fixed element, and said output gear is coupled to In the dyeing motor, the dyeing drive gear meshes with the output gear, and the movable element is connected to the dyeing drive gear to move relative to the fixed element, so that the movable element and the fixed The components cooperate to switch different dyeing driving parts to push the corresponding dyeing parts. The 3D printing pen according to claim 39, wherein the fixing element has a through hole, a plurality of perforations and a plurality of slide grooves, the through holes allow the consumables to pass through, and the plurality of perforations respectively provide the corresponding plurality of The dyeing parts pass through, and the plurality of dyeing driving members slide along the corresponding plurality of chutes when driven, wherein the plurality of perforations are respectively connected with the corresponding chutes and the through holes in the middle Pass. The 3D printing pen according to claim 40, wherein when the movable element and the fixed element move relative to each other, one of the dyeing driving elements of the plurality of dyeing driving elements is allowed to move along its corresponding chute moving until the dye driver is in position to push the dye through the corresponding perforation. The 3D printing pen according to claim 41, wherein the movable element has a through hole and an active groove, the through hole is for the consumable to pass through, and the movable groove has a proximal region and a distal region, wherein the movable element When relative movement occurs with the fixed element, when one of the dyeing driving members is driven to move along the movable groove and moves to the adaxial area, the dyeing driving member simultaneously moves along the corresponding The chute slides so as to push the corresponding dyeing end of the dyeing piece. The 3D printing pen according to claim 42, wherein each of the dyeing driving parts includes a sliding part and a rotating part, the sliding part is driven to slide along the corresponding chute, and the rotating part is driven to slide along the The movable groove of the movable element rotates. The 3D printing pen according to claim 36, wherein the dyeing driving mechanism has a plurality of chutes, and each of the dyeing driving parts is driven to move along the corresponding chutes to make at least a part of the dyeing parts contact the consumable to dye the consumable. The 3D printing pen according to claim 44, wherein the dyeing driving mechanism has an active groove, and the active groove has an adaxial area and an abaxial area, and the dyeing driving member is driven to move to all of the active grooves. When the adaxial area is mentioned, it moves along the corresponding chute at the same time so that at least a part of the dyeing element contacts the consumable, and when the dyeing driving element is driven to move to the abaxial area of the active groove , the dyeing driving part is far away from the dyeing part. The rotary wire feeding mechanism applied to a 3D printing device is characterized by comprising a plurality of rotary cutting elements spaced apart from each other, wherein the plurality of rotary cutting elements are arranged to be driven to rotate to cut into the consumable and push the consumable. The rotary wire feeding mechanism according to claim 46, wherein the rotary wire feeding mechanism further comprises a wire feeding motor, a wire feeding transmission assembly and a rotating base, the rotating base has a base channel for the consumable to pass through, A plurality of the rotary cutting elements are connected to the rotary base, and when the wire feeding motor is in operation, the rotary base is driven to rotate by the wire feeding transmission assembly, so as to drive the plurality of rotary cutting elements to rotate. The rotary wire feeding mechanism according to claim 47, wherein the wire feeding transmission assembly comprises an input gear driven by the wire feeding motor and a wire feeding gear meshed with the input gear, wherein the rotating base is controlled by The wire feeding gear is driven to rotate. The rotary wire feeding mechanism according to claim 48, wherein the wire feeding transmission assembly further includes a wire feeding pipe, and the wire feeding pipe rotates synchronously with the wire feeding gear to drive the rotating base to rotate synchronously . The rotary wire feeding mechanism according to claim 49, wherein the wire feeding gear is sleeved on the outside of the wire feeding pipe, and when the input gear drives the wire feeding gear to rotate, the wire feeding pipe is synchronized with The wire feeding gear rotates, and further drives the rotating base disposed in the wire feeding pipeline to rotate, so that each of the rotary cutting elements rotates. The rotary wire feeding mechanism according to claim 50, wherein the wire feeding pipeline includes a connecting pipeline and a wire feeding pipeline connected to the connecting pipeline, and a connecting hole is formed in the connecting pipeline for accommodating the rotating base. seat and the rotary cutting element. The rotary wire feeding mechanism according to claim 51, wherein the heating mechanism further comprises a stirring tube, and the wire feeding pipe is socketed with the stirring pipe, so that when the connecting pipe is driven to rotate, the stirring The tube rotates to stir the consumable after being heated and melted by the heating mechanism. The rotary wire feeding mechanism according to claim 51, wherein the wire feeding transmission assembly further includes a holding element, the holding element has a middle through hole for the consumable to pass through, and the holding element holds the rotating base in the connecting hole of the connecting pipe. The rotary wire feeding mechanism according to claim 53, wherein the holding element includes a limiting part and an extension part, the extension part has an outer surface, the connecting pipe of the wire feeding pipe has an inner surface, and the rotating A base is clamped between the outer surface of the extension of the retaining element and the inner surface of the connecting conduit of the wire feeding conduit. The rotary wire feeding mechanism according to claim 53, wherein the extension part of the holding element has an end surface, and the end surface of the extension part is pressed against the rotating base or the rotary cutting element. The rotary wire feeding mechanism according to claim 55, wherein the connecting pipe has an end face, and the stopper of the holding element is pressed against the end face of the connecting pipe, so that the rotating base is remain firmly within the connecting pipe. The rotary wire feeding mechanism according to claim 49, wherein the wire feeding gear is sleeved on the outside of the wire feeding pipe, and when the input gear drives the wire feeding gear to rotate, the wire feeding pipe is synchronized with The wire feeding gear rotates, and further drives the rotating base arranged outside the wire feeding pipeline to rotate, so that each of the rotary cutting elements rotates. The rotary wire feeding mechanism according to claim 48, wherein the rotary base has a plurality of installation slots, each of the rotary cutting elements is assembled in the corresponding installation slots of the rotary base, and the wire feeding motor During operation, the rotating base is driven to rotate by the wire feeding transmission assembly, so as to drive a plurality of rotary cutting elements to rotate. The rotary wire feeding mechanism according to claim 58, wherein the rotary wire feeding mechanism further comprises a holding element, the holding element has a middle through hole for the consumable to pass through, and the holding element is sleeved on the rotating The outer side of the base includes a plurality of holding arms, and each holding arm presses against the corresponding rotary cutting element. The rotary wire feeding mechanism according to claim 59, wherein said retaining element further comprises an engagement tube, said heating mechanism comprises an agitation tube, said agitation tube is socketed with said engagement tube such that said retaining element is driven When rotating, the stirring tube is driven to rotate to stir the consumables heated and melted by the heating mechanism. The rotary wire feeding mechanism according to claim 46, wherein the rotary wire feeding mechanism further comprises a rotating base and a wire feeding motor, the wire feeding motor has a motor through hole, and a base channel is formed in the rotating base , for the consumables to pass through, a plurality of the rotary cutting elements are spaced apart from each other and extend on the rotating base, wherein the rotating base is coaxially arranged with the wire feeding motor and driven by the wire feeding motor . The rotary wire feeding mechanism of claim 61, wherein the wire feeding motor includes an output shaft, and the rotating base is coupled to the output shaft of the wire feeding motor to be driven by the wire feeding motor. The rotary wire feeding mechanism according to any one of claims 46 to 62, wherein the rotary wire feeding mechanism comprises two rotary cutting elements arranged symmetrically about the center. A rotary wire feeding mechanism according to any one of claims 46 to 62, wherein said rotary wire feeding mechanism comprises two said rotary cutting elements, wherein two said rotary cutting elements are adapted to be arranged on opposite sides of the consumable two sides, and make the direction of the rotational force of the two rotary cutting elements on the consumable material opposite, so as to reduce the rotation of the consumable material. The rotary wire feeding mechanism according to any one of claims 46 to 62, wherein said rotary wire feeding mechanism comprises three said rotary cutting elements, wherein three said rotary cutting elements are adapted to evenly surround the consumable . A rotary wire feeding mechanism according to any one of claims 47 to 62, wherein a plurality of said rotary cutting elements are arranged to cut obliquely into the contact surface of the consumable and form a helix angle ω. A rotary wire feeding mechanism according to any one of claims 47 to 62, wherein a plurality of said rotary cutting elements are arranged to cut perpendicularly into the contact surface of the consumable and form a helix angle ω. The rotary wire feeding mechanism according to claim 66, wherein the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, D is the outer diameter of the consumable, af is the cut-in amount, wherein, the consumable lead P=F/(n×π×(D/2)^2), wherein F is the extruded amount of the consumable, n is the rotation speed of the wire feeding motor, and the screw The range of lift angle ω is 8.3°≤ω≤45°. The rotary wire feeding mechanism according to claim 67, wherein the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, D is the outer diameter of the consumable, af is the cut-in amount, wherein, the consumable lead P=F/(n×π×(D/2)^2), wherein F is the extruded amount of the consumable, n is the rotation speed of the wire feeding motor, and the screw The range of lift angle ω is 8.3°≤ω≤45° The wire feeding method for 3D printing equipment is characterized by comprising the steps of: cutting into consumables by driving and rotating a plurality of rotary cutting elements and pushing the consumables. The wire feeding method for a 3D printing device according to claim 70, wherein the consumable is pushed by obliquely cutting into the contact surface of the consumable by a plurality of the rotary cutting elements, wherein the plurality of rotary cutting elements interact with the consumable When the helix angle ω is formed. The wire feeding method for a 3D printing device according to claim 70, wherein a plurality of said rotary cutting elements vertically cut into the contact surface of the consumable to push the consumable, wherein a plurality of said rotary cutting elements interact with the consumable When the helix angle ω is formed. The wire feeding method for 3D printing equipment according to claim 71, wherein the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, and D is the outer diameter of the consumable. diameter, af is the cut-in amount, where the consumable lead P=F/(n×π×(D/2)^2), where F is the extruded amount of the consumable, n is the speed of the wire feeding motor, where the The range of helix angle ω is 8.3°≤ω≤45°. The wire feeding method for 3D printing equipment according to claim 72, wherein the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, and D is the outside of the consumable. diameter, af is the amount of cutting, where, the consumable lead P=F/(n×π×(D/2)^2), where F is the extruded amount of the consumable, n is the speed of the wire feeding motor, where the The range of helix angle ω is 8.3°≤ω≤45°. The wire feeding method for a 3D printing device according to any one of claims 70 to 74, wherein the wire feeding drive assembly is driven by a wire feeding motor to drive the rotating base to rotate, thereby driving a plurality of the rotary cutting elements to rotate. The wire feeding method for a 3D printing device according to any one of claims 70 to 74, wherein the rotating base is driven to rotate by a wire feeding motor coaxially arranged with the rotating base to drive a plurality of the rotary cutting elements turn. The method for outputting printing materials by a 3D printing pen is characterized in that it comprises the following steps: (a) being driven to rotate by a plurality of rotary cutting elements to cut into the consumable and push the consumable to convey the consumable in the delivery channel to the nozzle; and (b) heating the consumable to melt the consumable and output it from the nozzle. The method for outputting printing materials by a 3D printing pen according to claim 77, further comprising the step of: dyeing the consumables by a dyeing mechanism, so that the dyed consumables are heated and melted to output colored printing materials. The method for outputting printing materials by a 3D printing pen according to claim 80, further comprising the step of: driving the dyeing driving member to drive at least a part of the corresponding dyeing member to move and reach a position contacting the consumable to dye the consumable. The method for outputting printing materials by a 3D printing pen according to claim 81, further comprising the step of: switching different dyeing driving parts to drive the corresponding dyeing parts to make at least a part of the dyeing parts contact the consumables, so as to Realize the color-changing dyeing operation of the consumable. The method for outputting printing materials by a 3D printing pen according to any one of claims 77 to 80, wherein step (a) includes the step of: driving the wire feeding drive assembly through the wire feeding motor to drive the rotating base to rotate, thereby driving multiple The rotary cutting element rotates. The method for outputting printing materials by a 3D printing pen according to any one of claims 77 to 80, wherein step (a) includes the step of: driving the rotating base to rotate through a wire feeding motor coaxially arranged with the rotating base, so as to Drive multiple rotary cutting elements to rotate. The method for outputting printing materials by a 3D printing pen according to any one of claims 77 to 80, further comprising a step of stirring the heated consumables. The method for outputting printing materials by a 3D printing pen according to claim 81, further comprising the step of: stirring the heated consumables through a stirring tube driven by the wire feeding motor. The method for outputting printing materials by a 3D printing pen according to claim 82, further comprising a step of: stirring the heated consumables through a stirring tube driven by the wire feeding motor. The wire feeding method for a 3D printing device according to any one of claims 77 to 80, wherein a plurality of said rotary cutting elements obliquely cut into the contact surface of the consumable to push the consumable, wherein a plurality of said rotary cutting elements When interacting with this consumable, a helix angle ω is formed. The wire feeding method of a 3D printing device according to any one of claims 77 to 80, wherein a plurality of said rotary cutting elements vertically cut into the contact surface of the consumable to push the consumable, wherein a plurality of said rotary cutting elements When interacting with this consumable, a helix angle ω is formed. The wire feeding method for 3D printing equipment according to claim 86, wherein the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, and D is the outer diameter of the consumable. diameter, af is the amount of cutting, where, the consumable lead P=F/(n×π×(D/2)^2), where F is the extruded amount of the consumable, n is the speed of the wire feeding motor, where the The range of helix angle ω is 8.3°≤ω≤45°. The wire feeding method for a 3D printing device according to claim 87, wherein the helix angle ω=arctan[P/(π×(D-2×af))], P is the lead of the consumable, and D is the outer diameter of the consumable. diameter, af is the amount of cutting, where, the consumable lead P=F/(n×π×(D/2)^2), where F is the extruded amount of the consumable, n is the speed of the wire feeding motor, where the The range of helix angle ω is 8.3°≤ω≤45°. The wire feeding method for a 3D printing device according to any one of claims 77 to 80, further comprising the step of: allowing the consumable to push away from the rotary cutting element and reach the heating mechanism to complete the feeding preparation step.

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