CN118600649A - A multifunctional needle punching machine for carbon/carbon composite material crucible preform - Google Patents

Abstract

The invention discloses a multifunctional needling machine for a carbon/carbon composite material crucible preform, comprising a needling mechanism component, an electric control component, a frame component and a wooden mold driving component; the electric control component and the wooden mold driving component are both arranged on the frame component, a wooden mold is installed on the wooden mold driving component, the needling mechanism component is arranged on the frame component, corresponding to the segmented wooden mold surface, and is used for needling the product on the wooden mold segmented; the electric control component is used to control the needling mechanism component to adjust the position, step distance, puncture depth and frequency, and at the same time control the wooden mold driving component to adjust the position of the wooden mold. The invention can synchronously complete the needling of various crucible surfaces, realize mass production of preforms, improve product quality and efficiency, and ensure production safety.

Description

A multifunctional needle punching machine for carbon/carbon composite material crucible preform

Technical Field

The invention relates to the technical field of needling machines, in particular to a multifunctional needling machine for a carbon/carbon composite material crucible preform.

Background Art

At present, there are few types of carbon/carbon composite material preform needle punching equipment in China, especially the technology development of special equipment for special-shaped preform needle punching is at a bottleneck, and the level of automation remains at a relatively low level. Preform forming is mostly completed semi-mechanically and semi-manually, and preform forming is highly dependent on manual labor, resulting in poor consistency in the quality of the molded products and low production efficiency, which cannot meet the needs of mass production, greatly limiting the development and application of needle punching technology in the field of carbon/carbon composite materials.

Summary of the invention

In view of this, the present invention provides a multifunctional needling machine for carbon/carbon composite crucible preforms, which can synchronously complete the needling of various surfaces of the crucible, realize batch production of preforms, improve product quality and efficiency, and ensure production safety.

The technical solution adopted by the present invention is as follows:

A multifunctional needling machine for a carbon/carbon composite material crucible preform, comprising a needling mechanism component, an electric control component, a frame component and a wooden mold driving component;

The electric control component and the wooden mold driving component are both arranged on the frame component, the wooden mold driving component is mounted on the wooden mold, and the acupuncture mechanism component is arranged on the frame component, corresponding to the sections of the wooden mold surface, and is used for acupuncturing the products on the wooden mold in sections;

The electric control component is used to control the acupuncture mechanism component to adjust the position, step distance, puncture depth and frequency, and at the same time control the wooden mold driving component to adjust the position of the wooden mold.

Furthermore, the acupuncture mechanism assembly includes a straight section acupuncture mechanism, a bevel section acupuncture mechanism, an arc section acupuncture mechanism and a pot bottom section acupuncture mechanism, each of which includes a linear electric cylinder, a quick-change needle plate, a mounting frame, a guide shaft and a guide sleeve, the guide shaft passes through the guide sleeve and is fixed on the quick-change needle plate, the guide sleeve is fixed on the mounting frame, the linear electric cylinder is arranged on the mounting frame, and the output shaft of the linear electric cylinder drives the quick-change needle plate to move linearly along the guide shaft;

The quick-change needle plate of the straight-tube section acupuncture mechanism can adjust its position in the horizontal and vertical directions; the quick-change needle plate of the bevel section acupuncture mechanism can adjust its position in the horizontal and vertical directions, and the quick-change needle plate can adjust its angle within a certain range; the quick-change needle plate of the arc section acupuncture mechanism can adjust its position in the horizontal and vertical directions, and the quick-change needle plate itself can rotate within a certain angle range; the quick-change needle plate of the pot bottom section acupuncture mechanism can adjust its position in the horizontal and vertical directions.

Furthermore, the quick-change needle plate includes a needle plate back plate, a dovetail needle plate, a quick-clamp floating pressure plate, a floating spring and a hand screw;

The needle plate back plate opens and closes with the dovetail needle plate, and the quick-clamp floating pressure plate is fixed to the side of the needle plate back plate by a hand screw. At the same time, a dovetail groove is formed between the quick-clamp floating pressure plates on both sides of the needle plate back plate to clamp the dovetail needle plate; the floating spring is mounted on both ends of the outer circumference of the hand screw and is encapsulated in the needle plate back plate by the quick-clamp floating pressure plate and is in a compressed state.

Furthermore, the frame assembly includes an equipment base and an L-shaped bracket, the vertical portion of the L-shaped bracket is arranged on the equipment base, the electric control assembly and the wooden mold driving assembly are fixed on the equipment base and are arranged on both sides of the vertical portion of the L-shaped bracket, the horizontal portion of the L-shaped bracket is located at the top and extends toward the direction of the wooden mold driving assembly, the electric control assembly is fixedly connected to the vertical portion of the L-shaped bracket, and the top of the wooden mold driving assembly is fixedly connected to the horizontal portion of the L-shaped bracket.

Furthermore, the electric control assembly includes a dustproof electric control cabinet, an equipment status indicator light and an equipment human-machine interface;

The equipment status indicator light is arranged on the top surface of the L-shaped bracket, and the equipment human-machine interface is arranged on the surface of the vertical part of the L-shaped bracket; the door frame of the dustproof electric control cabinet is equipped with a sealing strip, and positive pressure fresh air is adopted inside.

Furthermore, the straight section acupuncture mechanism and the arc section acupuncture mechanism are arranged on the bottom surface of the horizontal part of the L-shaped bracket, and the straight section acupuncture mechanism is located outside the arc section acupuncture mechanism; the inclined section acupuncture mechanism and the pot bottom section acupuncture mechanism are arranged on the inner side of the vertical part of the L-shaped bracket, and the inclined section acupuncture mechanism is located below the pot bottom section acupuncture mechanism.

Furthermore, the equipment base includes a working platform and a base steel frame, the base steel frame is connected to the ground by bolts, and the working platform is welded to the base steel frame; the working platform is composed of a steel plate and a patterned plate welded together.

Furthermore, the wooden mold driving assembly includes a slewing support, a turntable, a wooden mold rotating mechanism, a positioning sensor, a wooden mold outer shaft and a wooden mold inner shaft;

A turntable is installed on the slewing support, and more than one wooden mold rotating mechanism is fixed on the turntable to provide multi-station operation. The positioning sensor is installed on the turntable and is used to locate the rotation position of the wooden mold; the wooden mold inner shaft is fixed on the wooden mold rotating mechanism, and the wooden mold outer shaft is fixed in the wooden mold. The front ends of the wooden mold inner shaft and the wooden mold outer shaft are conical faces and centering fit, and the rear ends are rigidly connected by expansion sleeves.

Beneficial effects:

1. The needling mechanism components correspond to the sections of the wooden model surface, and are used to needle the products on the wooden model in sections, and simultaneously complete the needling of various surfaces of the crucible preform, so as to realize the mass production of the crucible preform and improve the product quality and efficiency; secondly, the needling mechanism components adopt a multi-axis mechanism, that is, multiple servo motors work together, and multiple needling mechanisms can needle at the same time, which can automatically adjust the position, needling depth, angle, frequency and other parameters as the product surface and size change, and can be compatible with 32, 36, 42-inch crucible needling automatic needling machines.

2. The present invention adopts a multi-station operation mode, which can realize alternating operation of machines and people; it has high production efficiency and high safety.

3. The dustproof electric control cabinet of the present invention adopts a closed design, which can adapt to the production in the carbon powder environment. The cabinet door frame is equipped with a sealing strip to prevent external dust from entering the interior of the electric control cabinet; and positive pressure fresh air is used in the cabinet to prevent fiber and dust from entering, ensuring the internal air cleanliness and temperature control requirements.

4. The present invention sets four sets of multi-degree-of-freedom acupuncture components to perform acupuncture operations on the straight section, R angle section, bottom section and inclined section of the crucible preform respectively. The innovative acupuncture independent distribution control is adopted so that each acupuncture component can acupuncture the corresponding part separately or simultaneously, and the acupuncture operation is fast and efficient.

5. The present invention adopts a quick-change needle plate device, which can complete the disassembly and assembly of the needle plate within 10 seconds, and the needle plate can be replaced quickly and conveniently.

6. The connection between the wooden mold and the equipment (i.e. the inner and outer shafts of the wooden mold) of the present invention adopts the form of expansion sleeve, which is easy to disassemble.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of the present invention.

FIG. 2 is a schematic diagram of the double-station structure of the present invention.

Fig. 3 is a schematic diagram of the wooden mold structure of the present invention.

FIG. 4 is a schematic diagram showing the distribution of the acupuncture mechanisms of the present invention.

FIG. 5 is a schematic diagram of the structure of the acupuncture mechanism of the present invention.

FIG. 6 is a schematic diagram of the structure of the quick-change needle plate of the present invention.

FIG. 7 is a schematic cross-sectional view of the quick-change needle plate of the present invention.

FIG8 is a schematic diagram of the structure of the wooden mold driving assembly of the present invention.

Figure 9 is a schematic diagram of the connection between the inner and outer shafts of the wooden mold.

Figure 10 is a schematic diagram of the centering fit of the inner and outer cone surfaces of the wooden mold.

Among them, 1-L-shaped bracket, 2-needle mechanism assembly, 3-equipment human-machine interface, 4-equipment base, 5-wooden mold drive assembly, 6-dust-proof electric control cabinet, 7-straight section, 8-inclined section, 9-arc section, 10-bottom section, 11-operating platform, 12-base steel frame, 13-straight section acupuncture mechanism, 14-arc section acupuncture mechanism, 15-inclined section acupuncture mechanism, 16-bottom section acupuncture mechanism, 17-linear electric cylinder, 18-quick-change needle plate, 19-mounting frame, 20-guide shaft, 21-guide Toward sleeve, 22-needle plate back plate, 23-dovetail needle plate, 24-quick-clamp floating pressure plate, 25-floating spring, 26-hand screw, 27-slewing support, 28-turntable, 29-wooden mold rotation drive servo motor, 30-wooden mold rotation reducer, 31-wooden mold outer shaft, 32-wooden mold inner shaft, 33-mechanism cover, 34-wooden mold, 35-positioning sensor, 36-turntable servo motor, 37-turntable reducer, 38-wooden mold rotation mechanism fixed seat, 39-Morse taper, 40-equipment status indicator light.

DETAILED DESCRIPTION

The present invention is described in detail below with reference to the accompanying drawings and embodiments.

The present invention provides a multifunctional needling machine for a carbon/carbon composite material crucible preform, comprising a needling mechanism component 2, an electric control component, a frame component and a wooden mold driving component 5.

As shown in Figure 1, the electric control component and the wooden mold driving component 5 are both arranged on the frame component. The wooden mold driving component 5 is installed with the wooden mold 34, driving the wooden mold 34 to rotate and swivel, which is convenient for the operator to perform the process operation; the needling mechanism component 2 is arranged on the frame component, corresponding to the segmented surface of the wooden mold 34, and is used to needle the product on the wooden mold 34 in segments; the electric control component is used to control the needling mechanism component 2 to adjust the position, step distance, puncture depth and frequency, and at the same time control the wooden mold driving component 5 to adjust the position of the wooden mold 34. The whole machine can automatically adjust to adapt to the automatic needling of products with a diameter of 800mm-1200mm and a length of 600mm-1000mm. The above dimensions are obtained based on the dimensions of the carbon/carbon composite crucible preform (crucible preform diameter and length). The frame assembly includes an equipment base 4 and an L-shaped bracket 1. The vertical portion of the L-shaped bracket 1 is arranged on the equipment base 4. The electric control assembly and the wooden mold driving assembly 5 are fixed on the equipment base 4 and are arranged on both sides of the vertical portion of the L-shaped bracket 1. The horizontal portion of the L-shaped bracket 1 is located at the top and extends toward the direction of the wooden mold driving assembly 5. The electric control assembly is fixedly connected to the vertical portion of the L-shaped bracket 1, and the top of the wooden mold driving assembly 5 is fixedly connected to the horizontal portion of the L-shaped bracket 1.

The electrical control components include a dustproof electrical control cabinet 6, an equipment status indicator light 40 and an equipment human-machine interface 3; the equipment status indicator light 40 can display the current equipment operating status in real time, and the equipment status indicator light 40 is arranged on the top surface of the L-shaped bracket 1 for easy and obvious observation; the equipment human-machine interface 3 is an information exchange terminal between the equipment and the operator, and the operator can control the equipment through this terminal, and the equipment human-machine interface 3 is arranged on the vertical surface of the L-shaped bracket 1; the door frame of the dustproof electrical control cabinet 6 is equipped with sealing strips, and positive pressure fresh air is used inside.

The operator sends instructions to the control unit through the equipment human-machine interface 3, and the control unit controls the execution unit to perform the operation according to the predetermined designation. The control unit in the dustproof electric control cabinet 6 includes a wooden mold adjustment system and a needling assembly adjustment system, which can provide precise control of the servo motors corresponding to the action axes of the wooden mold drive assembly 5 and the needling mechanism assembly 2, so as to realize the movement and rotation of the wooden mold 34. The needling frequency, step distance, depth, position and other parameters of the needling mechanism corresponding to each profile can be set according to the product process, and each parameter can vary with the layer. As shown in Figure 3, in this embodiment, the wooden mold 34 is a three-dimensional barrel structure, and the profile is divided into: a straight tube section 7, an inclined surface section 8, an arc section 9, and a pot bottom section 10. In order to ensure the needling density of the product, for the needling of special-shaped parts, the needling frequency of the pot bottom section 10 and the inclined surface section 8 is less than that of the straight tube section 7. As the number of layers increases, the needling step distance becomes smaller. Each needling mechanism can be controlled individually. For special product requirements, such as thickened parts, they can be needled separately. For needling of larger surfaces (such as straight tube section 7), partial needling is used to reduce the impact of the wooden mold 34 and avoid over-needling. The wooden mold adjustment system can be automatically changed in time according to process requirements, and the adjustment is fully automated, and no manual intervention is required for the entire process. The needling component adjustment system has multi-axis linkage adjustment, fast position adjustment speed, and full servo control, which is efficient and safe. It also has a fault self-diagnosis design. When working, the system can realize self-diagnosis of faults such as control modules, measurement and control circuits, and network communications, and push corresponding fault codes. In addition, it also has complete detection and protection devices, including mechanical protection, electrical detection, safety door control, and fault alarm, etc. The control software and hardware are combined to build a stable and reliable protection system.

As shown in FIG4 , the acupuncture mechanism assembly 2 includes a straight section acupuncture mechanism 13, an arc section acupuncture mechanism 14, an inclined section acupuncture mechanism 15 and a pot bottom section acupuncture mechanism 16. The straight section acupuncture mechanism 13 and the arc section acupuncture mechanism 14 are arranged on the bottom surface of the horizontal part of the L-shaped bracket 1, and the straight section acupuncture mechanism 13 is located outside the arc section acupuncture mechanism 14; the inclined section acupuncture mechanism 15 and the pot bottom section acupuncture mechanism 16 are arranged on the inner side of the vertical part of the L-shaped bracket 1, and the inclined section acupuncture mechanism 15 is located below the pot bottom section acupuncture mechanism 16. The acupuncture heads of each acupuncture mechanism can be freely combined for acupuncture operations according to process requirements, and can be independently operated to meet different process operation requirements. The outer shell of the L-shaped bracket 1 is a sheet metal shell.

As shown in Figure 5, each acupuncture mechanism includes a linear electric cylinder 17, a quick-change needle plate 18, a mounting frame 19, a guide shaft 20 and a guide sleeve 21. The guide shaft 20 passes through the guide sleeve 21 and is fixed on the quick-change needle plate 18. The guide sleeve 21 is fixed on the mounting frame 19. The linear electric cylinder 17 is arranged on the mounting frame 19. At the same time, the output shaft of the linear electric cylinder 17 drives the quick-change needle plate 18 to move linearly along the guide shaft 20.

Among them, the quick-change needle plate of the straight-section needling mechanism 13 can adjust its position in the horizontal and vertical directions; the quick-change needle plate of the arc-section needling mechanism 14 can adjust its position in the horizontal and vertical directions, and the quick-change needle plate itself can rotate within a certain angle range; the needle beam and needle plate of the inclined-section needling mechanism 15 can adjust its position in the horizontal and vertical directions, and the quick-change needle plate can adjust its angle within a certain range; the quick-change needle plate of the pot-bottom section needling mechanism 16 can adjust its position in the horizontal and vertical directions.

As shown in Figures 6 and 7, the quick-change needle plate 18 includes a needle plate back plate 22, a dovetail needle plate 23, a quick-clamp floating pressure plate 24, a floating spring 25 and a hand screw 26; the needle plate back plate 22 and the dovetail needle plate 23 are opened and closed, and the quick-clamp floating pressure plate 24 is fixed to the side of the needle plate back plate 22 by the hand screw 26, and a dovetail groove is formed between the quick-clamp floating pressure plates 24 on both sides of the needle plate back plate 22, which is used to clamp the dovetail needle plate 23; the floating spring 25 is sleeved on both ends of the outer circumference of the hand screw 26, and is encapsulated in the needle plate back plate 22 by the quick-clamp floating pressure plate 24, and is in a compressed state. Quick clamping principle: after the two quick-clamp floating pressure plates 24 are clamped on both sides of the needle plate back plate 22, the two quick-clamp floating pressure plates 24 extend beyond the needle plate back plate 22 to form a dovetail groove, and the dovetail needle plate 23 is inserted into the dovetail groove, and the hand screw 26 nut is tightened to achieve quick clamping. After loosening the hand screw 26, the quick-clamp floating pressure plate 24 automatically springs up under the elastic force of the floating spring 25, the clamping force disappears, and the dovetail needle plate 23 is manually removed. It can be seen that the dovetail needle plate 23 can be removed by loosening the hand screw 26, and the new dovetail needle plate 23 can be installed and the hand screw 26 can be tightened. The dovetail needle plate 23 can be replaced quickly and conveniently.

As shown in FIG8 , the wooden mold driving assembly 5 includes a slewing support 27, a turntable 28, a wooden mold rotating mechanism, a positioning sensor 35, a wooden mold outer shaft 31 and a wooden mold inner shaft 32; the turntable 28 is installed on the slewing support 27, and more than one wooden mold rotating mechanism is fixed on the turntable 28 to provide multi-station operation. The positioning sensor 35 is installed on the turntable 28 and is used to locate the rotation position of the wooden mold 34. The wooden mold rotating mechanism is fixed on the turntable 28 through the wooden mold rotating mechanism fixing seat 38. As shown in FIG9 and FIG10 , the wooden mold inner shaft 32 is fixed on the wooden mold rotating mechanism, and the wooden mold outer shaft 31 is fixed in the wooden mold 34. The front ends of the wooden mold inner shaft 32 and the wooden mold outer shaft 31 are conical faces and matched, and the rear ends are rigidly connected by a tightening sleeve. The front end of the wooden mold inner shaft 32 and the inner wall of the wooden mold outer shaft 31 are conical surfaces, and the Morse taper 39 is matched, which is firmly fastened, automatically centered, and has high concentricity. As shown in FIG2 , in this embodiment, two wooden mold rotating mechanisms are fixed on the turntable 28 to provide double-station operation, which are respectively fixed on both sides of the turntable 28. The overall equipment is physically isolated from the human and the machine. Safety guardrails and safety gratings are set around the acupuncture area, with two-level protection. If a person accidentally breaks in, the power can be automatically cut off and the machine can be shut down immediately to ensure the safety of the operator, laying the foundation for the ultimate realization of fully enclosed, unmanned, and continuous operation. The turntable 28 can be used to rotate and switch the prefabricated wooden mold 34 that needs to be processed at the acupuncture position. Each prefabricated wooden mold 34 can rotate independently and freely, and the rotation speed can be adjusted steplessly. The rotation speed of the entire turntable 28 can be adjusted steplessly, and it has strong adaptability. Each drive unit adopts servo drive. When the switch button is pressed, the PLC controls the turntable 28 to rotate the specified wooden mold to the acupuncture position according to the received command.

The turntable 28 is driven to rotate by the turntable servo motor 36 and the turntable reducer 37. A mechanism cover 33 is set outside the wooden mold rotating mechanism to prevent dust from key parts; the wooden mold rotating mechanism includes a wooden mold rotating drive servo motor 29 and a wooden mold rotating reducer 30. Full servo control, rotation accuracy, controllable speed, and accurate stop position.

It can be seen that the driving mechanism of this embodiment uses a servo motor with a reducer as the main driving mechanism, and uses a programmable controller (PLC) as the control device of the motor, and uses a human-machine interface (touch screen) as the input and output device. Various types of sensors are used as signal acquisition devices to ensure timely feedback of information. By setting sensors to collect action data, compare the program's established data, and perform fault diagnosis. Compared with the open-loop control in the industry, this machine uses closed-loop control in full, and feedbacks data in real time to achieve automated and intelligent monitoring. In addition, the mechanism also includes various electrical components, such as angle encoders: angle value sampling and display; magnetic scales: acupuncture depth sampling and feedback.

The wooden mold 34 is installed by a quick clamping method, which can quickly put the wooden mold 34 up and down, specifically:

In the first step, the wooden formwork 34 is manually hoisted to the installation position by a forklift, a transfer vehicle, a crane, etc.;

The second step is to manually push the wooden mold 34 so that the wooden mold outer shaft 31 and the wooden mold inner shaft 32 (the wooden mold inner shaft 32 is installed on the equipment) are installed and matched in place;

The third step is to manually push the expansion sleeve on the inner shaft 32 of the wooden mold into the outer shaft 31 of the wooden mold;

The fourth step is to manually tighten the expansion sleeve screws, and the connection between the inner and outer shafts of the wooden mold is completed, that is, the installation of the wooden mold 34 is completed.

Note: The wooden mold 34 is removed from the equipment in the order of the fourth step → the first step.

The equipment base 4 includes a working platform 11 and a base steel frame 12. The base steel frame 12 is connected to the ground by bolts, and the working platform 11 is welded to the base steel frame 12. The working platform 11 is formed by welding a steel plate and a patterned plate.

The main function of this example is the needling forming of carbon/carbon composite material crucible preforms. The control interface is friendly and the operation is simple: select the crucible type on the equipment human-machine interface 3, enter the number of needling layers, select the needling part, and start the equipment with one key according to the set logic and frequency. After the needling is completed, each needling mechanism returns to its position and reminds the personnel to check. (Note: full-section needling, straight tube section 7, inclined section 8, pot bottom section 10, R angle section, i.e. arc section 9, needling function is optional, and the needling function includes arbitrarily specifying each needling mechanism to perform needling action alone; arbitrarily specifying several needling mechanisms to act simultaneously; arbitrarily adjusting the needling depth of each needling mechanism; arbitrarily arranging the needling action sequence of each needling mechanism).

In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The multifunctional needling machine for the carbon/carbon composite material crucible preform is characterized by comprising a needling mechanism assembly, an electric control assembly, a rack assembly and a wood pattern driving assembly;

the electric control assembly and the wood pattern driving assembly are arranged on the frame assembly, the wood pattern is arranged on the wood pattern driving assembly, and the needling mechanism assembly is arranged on the frame assembly and corresponds to the sectional surface of the wood pattern for needling the product on the wood pattern;

the electric control assembly is used for controlling the needling mechanism assembly to adjust the position, the step distance, the needling depth and the frequency, and controlling the wood pattern driving assembly to adjust the position of the wood pattern.

2. The multifunctional needling machine of the carbon/carbon composite crucible preform according to claim 1, wherein the needling mechanism assembly comprises a straight section needling mechanism, an inclined section needling mechanism, an arc section needling mechanism and a pan bottom section needling mechanism, each needling mechanism comprises a straight electric cylinder, a quick-change needle plate, a mounting frame, a guide shaft and a guide sleeve, the guide shaft penetrates through the guide sleeve to be fixed on the quick-change needle plate, the guide sleeve is fixed on the mounting frame, the straight electric cylinder is arranged on the mounting frame, and an output shaft of the straight electric cylinder drives the quick-change needle plate to linearly move along the guide shaft;

The quick-change needle plate of the straight barrel section needling mechanism can adjust the position along the horizontal direction and the vertical direction; the quick-change needle plate of the bevel section needling mechanism can be adjusted in position along the horizontal direction and the vertical direction, and meanwhile, the angle of the quick-change needle plate can be adjusted in a certain range; the quick-change needle plate of the circular arc section needling mechanism can adjust the position along the horizontal direction and the vertical direction, and simultaneously the quick-change needle plate can rotate within a certain angle range; the quick-change needle plate of the needling mechanism of the pan bottom section can adjust the position along the horizontal direction and the vertical direction.

3. The multifunctional needling machine of carbon/carbon composite crucible preforms of claim 2, wherein said quick change needle plate comprises a needle plate back plate, a dovetail needle plate, a quick clamp floating press plate, a floating spring and a hand screw;

The needle plate backboard and the dovetail needle plate are opened and closed, the quick clamping floating pressing plates are fixed on the side face of the needle plate backboard through hand screws, and dovetail grooves are formed between the quick clamping floating pressing plates on the two sides of the needle plate backboard and used for clamping the dovetail needle plate; the floating springs are sleeved at two ends of the outer circumference of the hand-screwed screw, and are packaged in the needle plate backboard by the quick clamping floating pressing plate and are in a compressed state.

4. The multifunctional needling machine of carbon/carbon composite crucible preforms of claim 2, wherein the frame assembly comprises an equipment base and an L-shaped bracket, the vertical portion of the L-shaped bracket is arranged on the equipment base, the electric control assembly and the wood pattern driving assembly are fixed on the equipment base and are respectively arranged on two sides of the vertical portion of the L-shaped bracket, the horizontal portion of the L-shaped bracket is arranged above and extends out towards the direction in which the wood pattern driving assembly is arranged, the electric control assembly is fixedly connected with the vertical portion of the L-shaped bracket, and the upper portion of the wood pattern driving assembly is fixedly connected with the horizontal portion of the L-shaped bracket.

5. The carbon/carbon composite crucible preform multifunctional needling machine of claim 4, wherein said electronic control assembly comprises a dust-proof electronic control cabinet, an equipment status indicator light, and an equipment human-machine interface;

the equipment state indicator lamp is arranged on the top surface of the L-shaped bracket, and the equipment man-machine interface is arranged on the surface of the vertical part of the L-shaped bracket; sealing rubber strips are additionally arranged on the dustproof electric control cabinet door frame, and positive pressure fresh air is adopted inside the dustproof electric control cabinet door frame.

6. The multifunctional needling machine of the carbon/carbon composite crucible preform according to claim 4, wherein the straight section needling mechanism and the circular arc section needling mechanism are arranged on the bottom surface of the horizontal part of the L-shaped bracket, and the straight section needling mechanism is positioned outside the circular arc section needling mechanism; the inclined surface section needling mechanism and the pot bottom section needling mechanism are arranged on the inner side surface of the vertical part of the L-shaped bracket, and the inclined surface section needling mechanism is positioned below the pot bottom section needling mechanism.

7. The multifunctional needling machine of the carbon/carbon composite crucible preform as defined in claim 4, wherein the equipment base comprises a working pedal and a base steel skeleton, the base steel skeleton is connected with the ground through bolts, and the working pedal is welded on the base steel skeleton; the operation pedal table is formed by welding a steel plate and a checkered plate.

8. The carbon/carbon composite crucible preform multifunctional needling machine of any of claims 2-7, wherein said wood pattern drive assembly comprises a swivel support, a turntable, a wood pattern rotation mechanism, a positioning sensor, a wood pattern outer shaft, and a wood pattern inner shaft;

The rotary support is provided with a rotary table, more than one wood pattern rotating mechanism is fixed on the rotary table to provide multi-station operation, and the positioning sensor is arranged on the rotary table and used for positioning the rotary position of the wood pattern; the inner wood die shaft is fixed on the wood die rotating mechanism, the outer wood die shaft is fixed in the wood die, the front ends of the inner wood die shaft and the outer wood die shaft are in conical surface centering fit, and the rear ends of the inner wood die shaft and the outer wood die shaft are rigidly connected through an expansion sleeve.