CN111645325B - Quantitative powder supply system, molding equipment and quantitative powder supply method - Google Patents
Quantitative powder supply system, molding equipment and quantitative powder supply methodInfo
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- CN111645325B CN111645325B CN202010626659.3A CN202010626659A CN111645325B CN 111645325 B CN111645325 B CN 111645325B CN 202010626659 A CN202010626659 A CN 202010626659A CN 111645325 B CN111645325 B CN 111645325B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/321—Feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
本发明涉及一种定量供粉系统、成型设备及定量供粉方法，该定量供粉系统能够实现较为精确的定量供粉，同时，由于供粉量的调定不在依赖粉辊的结构设计或粉末流量的精确控制，该定量供粉系统输出的粉堆可以适应幅面宽度较大的供粉场合。
The present invention relates to a quantitative powder supply system, a molding device, and a quantitative powder supply method. The quantitative powder supply system can realize relatively accurate quantitative powder supply. At the same time, since the adjustment of the powder supply amount is no longer dependent on the structural design of the powder roller or the precise control of the powder flow rate, the powder pile output by the quantitative powder supply system can adapt to powder supply occasions with a larger width.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a quantitative powder supply system and forming equipment with the quantitative powder supply system. Correspondingly, the invention also relates to a quantitative powder supply method.
Background
Compared with the traditional numerical control cutting processing, the 3D printing not only inherits the full-digital three-dimensional entity forming mode, but also can use various material properties to obtain the material mixed forming body with more diversified functions. Particularly, the layer-by-layer accumulation forming method adopted by the 3D printing equipment can effectively avoid the problem of cutter interference in numerical control cutting processing, thereby playing an advantage in the processing fields of complex contours, cavities, lattices and the like. According to different forming principles, the existing 3D printing devices are mainly classified into Fused Deposition Modeling (FDM), photo-curing modeling (SLA, LCD, DLP), powder selective fusion modeling (SLM), powder selective sintering modeling (SLS), laser Direct Modeling (LDM), and the like, wherein the FDM device adopts raw materials in the form of wires and particles, the photo-curing modeling adopts liquid photosensitive resin as raw materials, and the SLM and the SLS adopt fine powder raw materials. Thanks to the fine granularity of the powder material and the precise control capability of the selective heating of the laser beam, compared with other types of 3D printing equipment, the SLM and SLS equipment have the outstanding characteristic of high forming precision, and have the additional advantages of low dependence of a supporting structure and simple post-treatment when the SLM and SLS equipment are used for constructing three-dimensional parts due to the fact that the powder material has good dynamic flowability and static supporting performance.
Recently, along with continuous low prices of key components such as high-power lasers, galvanometer scanning devices and the like and mass production popularization of various metal and high-molecular fine powders, the SLMs and SLS equipment are upgraded to higher processing performance and better production efficiency, so that the printing size and forming speed of the SLMs and SLS processes are increased.
In SLM and SLS devices, a typical forming cycle includes three basic links, powder supply, powder spreading, and laser scanning. In an attempt to increase the print size and efficiency, laser scanning devices have evolved rapidly, however, the powder supply and spreading devices that are adapted thereto have evolved with a relative lag. With the increase of the printing size, the development of the powder supply device is delayed, and the further development of the equipment is restricted.
The existing powder supply devices are generally divided into two types, namely a powder cylinder and a powder roller. When the powder cylinder is suitable for large-size printing, the size of the powder cylinder is increased, the size of a forming bin is increased, the equipment size and the manufacturing cost are high, the powder adding and changing operations are complicated, the powder roller is matched with the powder feeding mode of the powder storage tank, the length of the powder roller is required to be set to be suitable for the width of a powder feeding breadth when the powder cylinder is suitable for large-size printing, however, when the powder roller rotates in a hopper to output quantitative powder outwards, in order to avoid accumulation of the powder in a gap between the powder roller and the hopper, the gap between the powder roller and the inner wall of the hopper is required to be strictly controlled, the larger dry friction exists between the periphery of the powder roller and the inner wall of the hopper, the dry friction is aggravated along with the increase of the length of the powder roller, and the powder feeding of the powder roller has larger manufacturing difficulty when the width of the powder breadth is increased to a certain value.
Some powder supplying devices described in some prior arts realize quantitative powder supply by controlling the output speed of powder, and adapt to the width requirement of the supplied powder by the movement of the powder supplying structure along the width of the web. However, the powder used in 3D printing is often small in particle size and has strong uncertainty in fluidity, so that the powder supply device is difficult to realize quantitative output of the powder in practice, and the powder pile formed by the device is large in fluctuation and unstable in volume, so that the improvement of printing quality is not facilitated.
Disclosure of Invention
Based on the above, it is necessary to provide a quantitative powder supply system, a molding device and a quantitative powder supply method, wherein the quantitative powder supply system can realize more accurate quantitative powder supply, and meanwhile, since the powder supply amount is not set depending on the structural design of a powder roller or the accurate control of the powder flow, the powder pile output by the quantitative powder supply system can adapt to the powder supply occasion with larger breadth.
The invention firstly provides a quantitative powder supply system, which comprises:
The powder storage device comprises a powder storage cavity and a powder outlet which is communicated with the powder storage cavity to the outside;
The powder feeding device comprises a powder feeding cavity and a powder feeding assembly arranged in the powder feeding cavity, wherein the powder feeding cavity is provided with an inlet end communicated with the powder outlet and an outlet end;
The powder collecting device comprises a powder collecting cavity communicated to the outlet end, a powder falling port arranged on the powder collecting cavity, and
The opening and closing device can move relative to the powder falling port so as to switch between an opening station and a closing station;
When the powder collecting cavity is filled with a preset amount of powder, the opening and closing device is switched to the opening station and opens the powder falling port so as to contain the powder in the powder collecting cavity to fall out.
The powder storage device comprises a powder storage cavity, a powder storage device, a powder collecting device, a powder feeding device and a powder feeding roller, wherein the powder storage device is arranged in the powder storage cavity of the powder storage device, powder can be stored in the powder storage cavity of the powder storage device and can be output to the inlet end of the powder feeding cavity through a powder outlet, powder entering the powder feeding cavity through the inlet end can enter the powder collecting device through the outlet end under the conveying of a powder feeding assembly, the powder collecting cavity is filled with a preset amount of powder, and then the opening and closing device is switched to an opening station.
In one embodiment, the predetermined amount of powder is capable of substantially filling the powder collection cavity.
Further, the powder collecting cavity is arranged as a cavity with a constant cross section along the length direction of the powder falling port, or is arranged as a cavity with a variable cross section along the length direction of the powder falling port.
The powder collecting cavity is arranged in the powder collecting cavity, the volume of the powder collecting cavity can be designed according to requirements, when the powder collecting cavity is filled with powder, the station of the opening and closing device is switched, the cross-sectional area of the output powder pile can be changed along with the change of the cross-sectional area of the powder collecting cavity, and therefore the powder pile with the controlled powder quantity and unevenly distributed powder quantity is obtained at the target powder supplying position, and the specific requirement of a more complex 3D printing scene on the powder supplying quantity is met.
In one embodiment, the powder feeding assembly comprises a driving source and a screw propeller connected with the output end of the driving source in a transmission way.
Further, along the length direction of the powder falling port, one side end part of the powder collecting cavity is communicated to the outlet end.
So set up, when the screw propeller rotates along with the actuating source, carry the powder that the entry end falls into to the exit end gradually, under this kind of conveying mode, can calculate according to the volume of album powder chamber, the rotational speed of actuating source etc. to the powder intracavity fill the required time of predetermined powder, then only need at every turn open the actuating source and calculate the time in advance, and need not to set up complicated detection device in album powder intracavity, can guarantee to fill the powder of the basically same volume in album powder chamber at every turn.
In one embodiment, when the opening and closing device is switched to the opening station, the driving source can drive the screw propeller to rotate reversely, so that powder is prevented from being continuously output to the powder collecting cavity from the outlet end.
So set up, the powder of different materials, the mobility difference is great, to some better powder of mobility, when headstock gear switches to opening the station, the powder of exit end still probably can continue to flow to album powder intracavity, drives the upset of screw propeller through the actuating source, can prevent that the powder from further flowing into album powder chamber, and the precision of quantitative powder supply is higher.
In one embodiment, the powder storage device comprises a stirring assembly rotatably arranged in the powder storage cavity.
Further, the stirring assembly rotates around a fixed shaft along the vertical direction, and the powder outlet is arranged at the lower end of the stirring assembly.
So set up, stirring subassembly stirs powder in storing up the powder intracavity, avoids powder deposit, caking, and the powder after stirring can flow out and get into the entry end in sub-powder export under the dead weight effect.
In one embodiment, the quantitative powder supply system further comprises a vibration device, wherein the vibration device is used for enabling the powder collecting device to vibrate.
In one embodiment, a plurality of vibration devices are arranged, and the plurality of vibration devices are arranged on the outer wall of the powder collecting cavity along the length direction of the powder falling port.
So set up, vibrating device can make album powder device produce vibrations to make album powder intracavity powder evenly distributed under the vibratory action, also avoid piling up the powder in album powder intracavity and agglomerating because of the extrusion.
In one embodiment, the quantitative powder supply system further comprises a control device, and the control device is electrically connected to the powder feeding device, the opening and closing device and the vibration device to control the working states of the powder feeding device, the opening and closing device and the vibration device.
In one embodiment, the opening and closing device comprises a baffle plate capable of translating along the width direction of the powder falling port, and the baffle plate is attached to the outer side wall of the lower end of the powder collecting device.
The second aspect of the invention also provides forming equipment comprising the quantitative powder supply system.
The third aspect of the present invention also provides a quantitative powder supply method, which includes:
Closing a powder falling port of the powder collecting device through an opening and closing device;
Starting a powder feeding component in the powder feeding device to convey powder in the powder feeding cavity from an inlet end to an outlet end;
when the powder collecting cavity of the powder collecting device is filled with a preset amount of powder, the opening and closing device is switched to an opening station, so that the preset amount of powder in the powder collecting cavity falls out from the powder falling port to form a powder pile.
In one embodiment, the length of the powder falling opening is set according to the width of the powder supply breadth, so that the powder in the powder collecting cavity in a preset quantity can be emptied through the powder falling opening, and a powder pile not smaller than the breadth is formed.
In one embodiment, the method for quantitatively supplying powder further comprises:
before the powder feeding device is started, a stirring assembly in the powder storage cavity is started to stir powder in the powder storage cavity, and the powder in the powder storage cavity is output to the powder feeding cavity through a powder outlet.
In one embodiment, before the opening and closing device is switched to the opening station, the powder feeding assembly in the powder feeding device is enabled to work for a preset time, so that a preset amount of powder is filled into the powder collecting cavity.
In one embodiment, after the opening and closing device is switched to the opening station, the powder feeding assembly acts in a reverse direction to prevent powder from flowing out of the outlet end to the powder collecting cavity.
In one embodiment, the vibration device is started when the powder feeding device is started or the starting and stopping device is switched to the starting station, so that the powder collecting device vibrates.
Drawings
FIG. 1 is a schematic diagram of a quantitative powder supply system according to an embodiment;
FIG. 2 is a schematic view showing a partial structure of the powder supplying system of FIG. 1;
FIG. 3 is a schematic view of another partial structure of the powder metering system shown in FIG. 1;
FIG. 4 is a working state diagram of the powder collecting device when the powder collecting device is closed by the opening and closing device;
FIG. 5 is a working state diagram of the powder collecting device when the opening and closing device is switched to the opening station;
FIG. 6 is a view showing the working state of the powder collecting cavity after the powder is emptied and a powder pile is formed on the powder receiving platform;
Fig. 7 is a control relationship diagram between a control device and a device controlled thereby.
100 Parts of powder storage device, 11 parts of powder storage cavity, 12 parts of powder outlet, 13 parts of stirring component, 200 parts of powder feeding device, 21 parts of powder feeding cavity, 22 parts of powder feeding component, 221 parts of driving source, 222 parts of screw propeller, 23 parts of inlet end, 24 parts of outlet end, 300 parts of powder collecting device, 31 parts of powder collecting cavity, 32 parts of powder falling port, 400 parts of opening and closing device, 41 parts of baffle plate, 500 parts of vibration device, 600 parts of control device, 700 parts of powder pile, 800 parts of powder receiving platform.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and are for example, as being fixedly connected, as being detachably connected, as being integral, as being mechanically connected, as being electrically connected, as being communicatively connected, as being directly connected, as being indirectly connected through an intermediary, as being internally connected or as being in interaction with two elements, unless otherwise explicitly limited. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Referring to fig. 1 to 3, a first aspect of the present invention provides a powder metering system that can cooperate with a powder spreading device, a laser/galvanometer, etc. to form a molding apparatus capable of performing a 3D printing job. The quantitative powder supply system is arranged corresponding to the powder receiving platform 800 of the forming equipment, so that a powder pile can be formed on the powder receiving platform 800, and when the powder spreading device is configured, the powder spreading device can directly spread the powder pile on the powder receiving platform 800 to form a powder bed.
The quantitative powder supply system can comprise a powder storage device 100, a powder delivery device 200, a powder collection device 300 and an opening and closing device 400, wherein the powder storage device 100 comprises a powder storage cavity 11 and a powder outlet 12 which is communicated with the powder storage cavity 11 to the outside.
In some embodiments, the powder storage device 100 may further include a stirring assembly 13, where the stirring assembly 13 is driven by an external motor or other driving device to rotate in the powder storage cavity 11, so as to stir the powder in the powder storage cavity 11 to keep the powder in a flowing state. The stirring assembly 13 rotates around a fixed axis in the vertical direction, and the powder outlet 12 may be disposed at the lower end of the stirring assembly 13, so that the powder stirred to a flowing state may directly flow out from the powder outlet 12 under the action of gravity.
It will be appreciated that in some embodiments, the powder storage device 100 may be provided with a plurality of powder outlets 12 to connect the powder storage chamber 11 to a plurality of powder supply assemblies, so as to meet the powder supply requirements of different areas in the same molding apparatus.
Referring to fig. 1 and 2, the powder feeding device 200 includes a powder feeding chamber 21 and a powder feeding assembly 22 provided in the powder feeding chamber 21, the powder feeding chamber 21 having an inlet end 23 and an outlet end 24, which are respectively communicated with the powder outlet 12 and the powder collecting device 300. Powder in the powder storage cavity 11 flows out through the powder outlet 12 and enters the powder feeding cavity 21 through the inlet end 23, and is driven to the outlet end 24 under the conveying action of the powder feeding assembly 22 and then enters the powder collecting device 300.
As described with reference to fig. 1 and 3, the powder collecting device 300 includes a powder collecting cavity 31 and a powder dropping port 32, wherein a predetermined volume of powder can be filled in the powder collecting cavity 31, and the powder can be discharged onto the powder receiving platform 800 through the powder dropping port 32, so as to realize quantitative powder supply.
The opening and closing device 400 can move relative to the powder falling port 32 to switch between an opening station and a closing station. In the opening station, the opening and closing device 400 closes the powder falling port 32, the powder feeding assembly 22 can convey powder entering the powder feeding cavity 21 to the powder collecting cavity 31, and when a preset amount of powder is filled in the powder collecting cavity 31, the opening and closing device 400 is switched to the opening station and opens the powder falling port 32, and the powder in the powder collecting cavity 31 falls out from the powder falling port 32.
In some embodiments, the switching of the opening and closing device 400 to the opening position is performed in a state in which the powder collecting cavity 31 is substantially filled. In other embodiments, the predetermined amount of powder may fill only a portion of the interior cavity of the powder collection cavity 31.
In the actual powder feeding process, the length of the powder falling port 32 can be set according to the width of the powder feeding breadth, so that the powder feeding system can be suitable for wide powder feeding occasions with larger breadth. In the prior art, in order to realize the quantitative powder supply, the powder supply is generally realized through a powder roller or a powder storage cylinder. In particular, in a quantitative powder supply device adopting a powder roller, powder is generally quantified through a structure with a fixed volume designed on the powder roller, then the quantified powder is discharged along with the rotation of the powder roller to form a powder pile, in the process, in order to avoid powder entering between the powder roller and a shell, the design of a rotation gap between the powder roller and the shell is smaller, so that dry friction exists between the powder roller and the inner wall of the shell, and the dry friction between the powder roller and the shell is increased along with the increase of the width of the breadth, so that the problem that the powder roller is blocked and the powder storage rate is low when the powder roller is suitable for a wide-breadth powder supply occasion is solved, and when the powder is quantitatively supplied in a form of a powder storage cylinder, the powder storage cylinder is required to be lifted by a certain distance, and relatively, the powder with a preset thickness on the powder storage cylinder is required to be scraped on the forming cylinder by a powder paving device such as a powder paving scraper, and the size of the powder storage cylinder is required to be adapted to the width requirement when the powder storage cylinder is suitable for a wide-breadth powder supply occasion, and the size of a forming bin is required to be obviously increased. Other quantitative powder feeding devices are generally used for realizing quantitative powder feeding by controlling the powder flow when being suitable for wide powder feeding occasions, and the powder is difficult to control to flow out according to the preset flow rate due to the large difference of the flowability of the powder made of different materials, so that the quantitative powder feeding is difficult to control in practice in the mode.
Unlike this, in the present invention, the powder feeding unit 22 does not need to be specially designed as long as it can feed the powder entering the powder feeding chamber 21 to the powder collecting chamber 31, and the powder is quantitatively fed by charging a predetermined amount of powder into the powder collecting chamber 31 and discharging. It will be appreciated that in the case of a certain working efficiency of the powder feeding assembly 22, the time required for filling the powder collecting cavity 31 may be measured, for example, when it is measured that it takes 1min for filling the powder collecting cavity 31 with powder and 30s for discharging the powder in the powder collecting cavity 31, the opening and closing device 400 may be switched to the opening position once every 1min, at which time the powder collecting cavity 31 is filled, and after the opening and closing device 400 is in the opening position 30s, the opening and closing device 400 may be switched to the closing position, at which time the powder in the powder collecting cavity 31 is discharged.
It will be appreciated that when the powder collection chamber 31 is filled with powder and the powder is completely emptied, the powder distribution can be controlled by forming a powder mass. Of course, in some embodiments, each time the opening and closing device 400 is switched to the opening position, the powder collecting cavity 31 may not be filled with the powder, but only a certain amount of powder is filled each time, in this embodiment, the powder in the powder collecting cavity 31 may be vibrated to be uniformly distributed along the length direction of the powder falling port 32 by other means, such as vibration, so as to control the distribution of the powder after output. In the embodiment of filling the powder collecting cavity 31 and switching the opening and closing device 400, no complex sensor is required to be arranged in the powder collecting cavity 31, or the flow of powder is accurately controlled, so long as the working time of the powder feeding assembly 22 required by the powder collecting cavity 31 is measured, the structure of the quantitative powder feeding system is simpler, and the manufacturing, controlling and maintaining costs are lower.
When adapting to a wide-width powder feeding field, the length of the powder falling port 32 is set according to the width of the web. Along the length direction of the powder falling port 32, the powder collecting cavity 31 is set as a constant section cavity or a variable section cavity according to the powder supply requirement. When the powder collecting cavity 31 is a cavity with a uniform cross section, the powder pile formed when the powder filled in the powder collecting cavity 31 is discharged from the powder falling port 32 has a uniform cross section area, and when the powder collecting cavity 31 is a cavity with a variable cross section, for example, the cross section area is gradually reduced, the output powder pile also has a corresponding change, namely, the cross section area is also tapered. By changing the cross-sectional area of the powder collecting chamber 31, the distribution of the powder supply amount can be controlled.
The powder feeding unit 22 may include a driving source 221 and a screw propeller 222 drivingly connected to an output end of the driving source 221, wherein the screw propeller 222 is disposed in a horizontal direction as shown in fig. 2 and 3, and the powder flowing into the inlet end 23 is gradually fed to the outlet end 24 along with the rotation of the screw propeller 222. Along the length direction of the powder falling port 32, one end of the powder collecting cavity 31 is connected to the outlet end 24, and powder is input from one side of the powder collecting cavity 31 and gradually fills the powder collecting cavity 31.
When the powder fluidity is strong, after the opening and closing device 400 is switched to the opening station, the powder in the powder feeding cavity 21 may still continuously flow into the powder collecting cavity 31, so as to avoid affecting the powder feeding precision, the driving source 221 may drive the screw propeller 222 to rotate reversely, so as to prevent the powder from continuously flowing into the powder collecting cavity 31. The driving source 221 may be a servo motor or a stepping motor with a forward and reverse rotation function, and when the rotation speed is determined and the amount of powder to be fed by the screw propeller 222 for one rotation is substantially determined, the amount of powder charged in the powder collecting chamber 31 may be controlled by controlling the forward and reverse rotation time of the driving source 221.
When the powder collecting cavity 31 is filled with powder, the screw propeller 222 continues to rotate to continuously generate propelling force to the powder, the propelling force counteracts the blocked force of the powder at the end, far away from the screw propeller 222, of the powder collecting cavity 31, the powder cannot enter the powder collecting cavity 31 continuously, but the resistance of the screw propeller 222 to continue to rotate is increased, and the resistance is insufficient to cause the rigid blocking problem of the driving source 221. Thus, some redundancy may be left slightly in calculating the time required to fill the powder collection chamber 31, for example, 1 minute may be required to determine to fill the powder collection chamber 31 with powder, and in practice the screw auger 222 may be set to operate for a slightly longer time than 1 minute to ensure that the powder collection chamber 31 is full.
In other embodiments, the powder feeding unit 22 may be a peristaltic pump, an ash pump, or the like, as long as the powder flowing in from the inlet end 23 can be fed into the powder collecting chamber 31 communicating with the outlet end 24.
Referring to fig. 1 and 3, the powder metering system may further include a vibration device 500, where the vibration device 500 is used to vibrate the powder collecting device 300 to uniformly distribute the powder in the powder collecting cavity 31 and prevent the powder from adhering and hardening on the inner wall of the powder collecting cavity 31, and at the same time, when the opening and closing device 400 is switched to the opening station, the vibration device 500 may further accelerate the speed of the powder flowing out of the powder falling port 32.
When the powder falling port 32 is set longer according to the width of the web, the powder collecting cavity 31 is correspondingly longer, and at this time, a plurality of vibration devices 500 may be disposed along the length direction of the powder falling port 32. The vibration device 500 may be directly installed on the outer wall of the powder collecting cavity 31, or may be disposed at other positions, so long as the vibration device can drive the powder in the powder collecting cavity 31 to vibrate.
Referring to fig. 7, the powder metering system may further include a control device 600, and the control device 600 is electrically connected to the driving source 221 of the powder feeding assembly 22, the opening and closing device 400, the vibration device 500, and the stirring assembly 13. When the quantitative powder supply system works, the stirring assembly 13 can be started through the control device 600 firstly, so that the powder in the powder storage cavity 11 is stirred to a flowing state, then the driving source 221 is started, so that the powder conveying assembly 22 can convey the powder to the powder collecting cavity 31, in the process, the vibration device 500 can be started, the powder is prevented from adhering and hardening in the powder collecting cavity 31, or the vibration device 500 can be started after the powder collecting cavity 31 is filled with the powder. After the powder feeding assembly 22 works for a period of time, the powder collecting cavity 31 is filled with a predetermined amount of powder, and at this time, the control device 600 controls the opening and closing device 400 to switch to the opening station so as to open the powder falling port 32. The control device 600 may be any existing device for outputting a control signal, such as a PLC, a single chip microcomputer, etc.
The opening and closing device 400 comprises a baffle 41, and can further comprise a driving mechanism for controlling the baffle 41 to move relative to the powder falling port 32, wherein the baffle 41 can translate along the width direction of the powder falling port 32 and is attached to the outer side wall of the lower end of the powder collecting device 300. The opening and closing device 400 is used for shielding or opening the powder falling port 32 at a proper time, so that the existing valve structure can be adopted. It will be appreciated that the movement of the aforementioned shutter 400 relative to the powder drop port 32 refers to the movement of the middle baffle 41 or similar moving member of the shutter 400 and does not require the entire movement of the shutter 400.
The second aspect of the invention also provides forming equipment, which comprises the quantitative powder supply system of any embodiment.
Referring to fig. 4 to 6, the third aspect of the present invention further provides a quantitative powder supply method, comprising the steps of:
Closing the powder falling port 32 by the opening and closing device 400;
Opening the powder feeding assembly 22 in the powder feeding device 200 to feed the powder in the powder feeding chamber 21 from the inlet end 23 to the outlet end 24;
When the powder collecting cavity 31 is filled with a predetermined amount of powder, the opening and closing device 400 is switched to an opening station, so that the powder in the powder collecting cavity 31 falls out from the powder falling opening 32, and a powder pile 700 is formed on the powder receiving platform 800.
In one embodiment, the length of the powder falling port 32 is set according to the width of the web of powder supply so that the powder in the powder collecting cavity 31 can be emptied through the powder falling port 32 and a powder pile 700 not smaller than the width of the web is formed at one time.
Further, the quantitative powder supply method further comprises the following steps:
Before the powder feeding device 200 is started, the stirring assembly 13 in the powder storage cavity 11 is started to stir the powder in the powder storage cavity 11, and the stirred powder in the powder storage cavity 11 is output to the powder feeding cavity 21 through the powder outlet 12.
Further, before the opening and closing device 400 is switched to the opening station, the powder feeding assembly 22 of the powder feeding device is operated for a preset time to fill the powder collecting cavity 31 with a preset amount of powder.
In some embodiments, when the opening and closing device 400 is switched to the opening position, the driving source 221 in the powder feeding assembly 22 reversely drives the screw propeller 222 to rotate, so as to prevent the powder from flowing out from the outlet end 24 to the powder collecting cavity 31.
In addition, in the embodiment provided with the vibration device 500, the vibration device 500 may be turned on while the powder feeding device 200 is turned on or when the opening and closing device 400 is switched to the opening position, so that the powder collecting device 300 vibrates, the powder is prevented from being hardened and adhered in the powder collecting cavity 31, and the powder discharging speed from the powder falling port 32 is increased.
It will be appreciated that the above-mentioned quantitative powder feeding method is not dependent on the specific structure, and can be implemented by charging a predetermined amount of powder into a cavity with a fixed volume through a proper powder feeding structure and evacuating the powder in the cavity, and the powder feeding method is not required to cooperate with a powder roller, and can be well adapted to wide-range powder feeding situations by designing the powder collecting cavity 31 and setting the length of the powder falling port 32 according to the powder feeding requirement.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (14)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010626659.3A CN111645325B (en) | 2020-07-02 | 2020-07-02 | Quantitative powder supply system, molding equipment and quantitative powder supply method |
Applications Claiming Priority (1)
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| KR20100086703A (en) * | 2009-01-23 | 2010-08-02 | (주)지오엘리먼트 | Carrying apparatus, measuring method for powder source and measuring part used the same |
| CN206218519U (en) * | 2016-10-27 | 2017-06-06 | 深圳市元谋人科技有限公司 | A kind of storage of solid powder and quantitative powder device |
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| CN208345341U (en) * | 2018-05-30 | 2019-01-08 | 苏州倍丰激光科技有限公司 | Continous way powder feeder and powder system without interruption |
| CN110202789A (en) * | 2019-06-26 | 2019-09-06 | 北京易加三维科技有限公司 | Continuous stepless variable powder feeder unit for increasing material manufacturing |
| CN212331873U (en) * | 2020-07-02 | 2021-01-12 | 杭州德迪智能科技有限公司 | Quantitative powder supply system and forming equipment |
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| KR20100086703A (en) * | 2009-01-23 | 2010-08-02 | (주)지오엘리먼트 | Carrying apparatus, measuring method for powder source and measuring part used the same |
| CN206218519U (en) * | 2016-10-27 | 2017-06-06 | 深圳市元谋人科技有限公司 | A kind of storage of solid powder and quantitative powder device |
| CN208345341U (en) * | 2018-05-30 | 2019-01-08 | 苏州倍丰激光科技有限公司 | Continous way powder feeder and powder system without interruption |
| CN108994297A (en) * | 2018-09-06 | 2018-12-14 | 深圳市圆梦精密技术研究院 | Powder feeder device |
| CN110202789A (en) * | 2019-06-26 | 2019-09-06 | 北京易加三维科技有限公司 | Continuous stepless variable powder feeder unit for increasing material manufacturing |
| CN212331873U (en) * | 2020-07-02 | 2021-01-12 | 杭州德迪智能科技有限公司 | Quantitative powder supply system and forming equipment |
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