Stator core wedge slot processing equipment of permanent magnet brushless motor

Abstract

The utility model relates to the technical field of permanent magnet brushless motors, in particular to stator core wedge slot processing equipment of a permanent magnet brushless motor, which comprises a workbench main body, a stamping table is arranged at the top of the workbench main body, and a connecting shell is arranged on the outer side of the stamping table and located at the top of the workbench main body. A feeding assembly is arranged in the connecting shell, a guide frame is arranged on the outer side of the feeding assembly, a guide assembly is arranged at the end, away from the feeding assembly, of the guide frame, a positioning assembly is arranged in the stamping table, and a connecting frame is arranged at the position, located on the outer side of the stamping table, of the top of the workbench body. A stamping block is arranged at the end, close to the stamping table, of the connecting frame. The feeding assembly is used for carrying out feeding treatment on a stator iron core wedge groove; the guide assembly is used for guiding the stator core wedge groove, and compared with an existing machining device, the overall practicability of the machining device can be improved through the design.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet brushless motors, in particular to a device for processing wedge grooves in a stator core of a permanent magnet brushless motor. Background Art

[0002] The stator core wedges of permanent magnet brushless motors are a crucial component of motor design, significantly impacting motor performance. Their primary function is to secure the coils embedded in the core, preventing them from shifting within the slots, including preventing them from popping out. This is essential for stable motor operation. Magnetic wedges are often used in high-efficiency and high-voltage motors. Magnetic wedges not only perform the same securing functions as conventional wedges, but also influence the motor's magnetic circuit. They increase the magnetic conductive area of ​​the motor core, reduce the excitation current, and improve the power factor, thereby increasing motor efficiency.

[0003] The wedge slot stamping of the stator core of a permanent magnet brushless motor is an important link in the motor manufacturing process. It involves the precise forming of the stator core and the fixing of the slot wedge. During the existing processing, the electrical steel sheet is manually placed on the stamping table of the stamping machine, and is stamped by the stamping machine. The blanking, forming, finishing, trimming and other processes are completed in the mold to form the preliminary shape of the stator core. The manual placement of the electrical steel sheet is inefficient during processing, and the staff may easily come into contact with the stamping block of the stamping machine and be injured. Therefore, it is particularly important to improve the existing processing equipment and design a new type of stator core wedge slot processing equipment for permanent magnet brushless motors to solve the above technical defects and improve the practicality of the overall processing equipment. Utility Model Content

[0004] The purpose of the utility model is to provide a wedge groove processing equipment for the stator core of a permanent magnet brushless motor. When electrical steel sheets need to be processed, multiple groups of electrical steel sheets are placed inside a feeding assembly. The feeding assembly can transport the electrical steel sheets to the inside of a guide frame. When the electrical steel sheets are introduced into the inside of the guide frame, the guide assembly can guide a certain amount of the electrical steel sheets into the inside of a positioning assembly for processing. Through the overall design, the effect of automatic feeding can be achieved, manual intervention can be reduced, and production efficiency can be improved, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A stator core wedge groove processing device for a permanent magnet brushless motor comprises a workbench main body, a stamping table is provided on the top of the workbench main body, a connecting shell is provided on the outside of the stamping table and located on the top of the workbench main body, a feeding assembly is provided inside the connecting shell, a guide frame is provided on the outside of the feeding assembly, a guide assembly is provided on the end of the guide frame away from the feeding assembly, a positioning assembly is provided inside the stamping table, a connecting frame is provided on the top of the workbench main body and located on the outside of the stamping table, and a stamping block is provided on the end of the connecting frame close to the stamping table;

[0007] The feeding assembly is used to feed the stator core wedge slots;

[0008] The guide assembly is used to guide the stator core wedge slot;

[0009] The positioning assembly is used to perform positioning and punching processing on the stator core wedge slots.

[0010] As a preferred solution of the present invention, the feeding assembly consists of a rotating rod, a rotating disk, a connecting tube, a limiting ring and a closing cover. The rotating rod is rotatably connected to the inside of the connecting shell, the rotating disk is fixedly connected to the outside of the rotating rod, the two groups of connecting tubes are both located inside the rotating disk, the limiting ring is rotatably connected to the outside of the rotating rod and is located below the rotating disk, and the closing cover is rotatably connected to the end of the connecting tube away from the rotating disk.

[0011] As a preferred solution of the present invention, a fixed disk is provided inside the connecting shell and above the rotating disk, and a lower hopper is provided on the outside of the connecting shell where the fixed disk extends to the outside of the connecting shell. An elastic connecting ring is provided at one end of the connecting tube close to the lower hopper, and the connecting tube is connected to the lower hopper through an elastic limiting ring.

[0012] As a preferred solution of the present invention, an oblique groove is provided at the bottom of the limiting ring, the closing cover is slidably connected to the limiting ring at one end away from the connecting cylinder, and the closing cover is connected to the connecting cylinder through a torsion spring, and the rotating rod is fixedly connected to a driving gear at one end away from the rotating disk, and the outer side of the driving gear is meshed with a semicircular gear, and the interior of the semicircular gear is fixedly connected to the driving end of the first driving motor.

[0013] As a preferred solution of the present invention, the guide assembly consists of a rotating block, a limit rod, a connecting rod, a limit block, a limit groove, a limit rod, a protrusion and a driving block. The rotating block is rotatably connected to the end of the guide frame away from the rotating disk, multiple groups of the limit rods are located on the outside of the rotating block, the connecting rod is located inside the rotating block, the limit block is located at the end of the connecting rod away from the rotating block, multiple groups of the limit grooves are opened inside the limit block, the limit rod is rotatably connected to the inside of the connecting shell and close to one end of the limit block, the protrusion is located at the end of the limit rod away from the limit block, and the driving block is rotatably connected to the inside of the connecting shell and close to one end of the protrusion.

[0014] As a preferred solution of the present invention, the rotating block is connected to the guide frame through a limit rod, the internal structure size of the limit groove is designed to correspond to the external structure size of the limit rod, the limit rod is connected to the limit block through the limit groove, the interior of the driving block is fixedly connected to the driving end of the second driving motor, and a compression spring is provided on the outer side of the limit rod and close to the end of the protrusion, and the compression spring is connected to the connecting shell at the end away from the limit rod.

[0015] As a preferred solution of the present invention, the positioning assembly consists of a positioning block, a first transmission rod, a second transmission rod and a connecting block, multiple groups of the positioning blocks are slidably connected to the top of the stamping table, the first transmission rod is rotatably connected to the bottom of the positioning block and is located inside the stamping table, the second transmission rod is rotatably connected to the end of the first transmission rod away from the positioning block, the connecting block is located at the end of the multiple groups of second transmission rods away from the first transmission rod, the second transmission rod and the connecting block are rotatably connected, and a telescopic cylinder is provided inside the stamping table and below the connecting block, and the driving end of the telescopic cylinder is connected to the positioning block.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. In the present invention, the feeding assembly is designed to cooperate with the guide assembly. When electrical steel sheets need to be processed, multiple groups of electrical steel sheets are placed inside the feeding assembly. The feeding assembly can transport the electrical steel sheets to the inside of the guide frame. When the electrical steel sheets are introduced into the inside of the guide frame, the guide assembly can guide a certain amount of the electrical steel sheets into the interior of the positioning assembly for processing. The overall design achieves the effect of automated feeding, reduces manual intervention, and improves production efficiency.

[0018] 2. In the present invention, through the design of the positioning assembly, when the electrical steel sheet is introduced into the bottom of the stamping block through the guide frame, multiple groups of positioning blocks are displaced to limit and clamp the electrical steel sheet, thereby positioning it. When the stamping block is stamping the electrical steel sheet, it can prevent it from being offset, which affects the processing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the fixed disk structure of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the feeding component of the utility model;

[0022] Figure 4 This is a schematic diagram of the guide assembly structure of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the limit ring of the utility model;

[0024] Figure 6 This is a schematic diagram of the positioning component structure of the utility model.

[0025] In the figure: 1. workbench body; 2. stamping table; 3. connecting shell; 4. feeding assembly; 5. guide frame; 6. guide assembly; 7. positioning assembly; 8. connecting frame; 9. stamping block; 10. rotating rod; 11. rotating disk; 12. connecting cylinder; 13. limiting ring; 14. closing cover; 15. fixed disk; 16. lower hopper; 17. elastic connecting ring; 18. inclined groove; 19. driving gear; 20. semicircular gear; 21. rotating block; 22. limiting rod; 23. connecting rod; 24. limiting block; 25. limiting groove; 26. clamping rod; 27. protrusion; 28. driving block; 29. ​​compression spring; 30. positioning block; 31. first transmission rod; 32. second transmission rod; 33. connecting block. DETAILED DESCRIPTION

[0026] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] Example:

[0028] See also Figures 1-6 , the utility model provides a technical solution:

[0029] A stator core wedge groove processing device for a permanent magnet brushless motor includes a workbench body 1, a punching table 2 is provided on the top of the workbench body 1, a connecting shell 3 is provided on the outside of the punching table 2 and located on the top of the workbench body 1, a feeding assembly 4 is provided inside the connecting shell 3, a guide frame 5 is provided on the outside of the feeding assembly 4, a guide assembly 6 is provided on the end of the guide frame 5 away from the feeding assembly 4, a positioning assembly 7 is provided inside the punching table 2, a connecting frame 8 is provided on the top of the workbench body 1 and located on the outside of the punching table 2, and a punching block 9 is provided on the end of the connecting frame 8 close to the punching table 2;

[0030] The feeding assembly 4 is used for feeding the stator core wedge slot;

[0031] Furthermore, the feeding assembly 4 is composed of a rotating rod 10, a rotating disk 11, a connecting tube 12, a limiting ring 13 and a closing cover 14. The rotating rod 10 is rotatably connected to the inside of the connecting shell 3, the rotating disk 11 is fixedly connected to the outside of the rotating rod 10, and the two sets of connecting tubes 12 are both located inside the rotating disk 11. The limiting ring 13 is rotatably connected to the outside of the rotating rod 10 and is located below the rotating disk 11. The closing cover 14 is rotatably connected to the end of the connecting tube 12 away from the rotating disk 11. When electrical steel sheets need to be processed, multiple groups of electrical steel sheets are placed inside the feeding assembly 4, and the electrical steel sheets can be transported to the inside of the guide frame 5 through the feeding assembly 4.

[0032] Among them, a fixed disk 15 is provided inside the connecting shell 3 and above the rotating disk 11. The fixed disk 15 extends to the outside of the connecting shell 3 and is provided with a lower hopper 16. An elastic connecting ring 17 is provided at one end of the connecting tube 12 close to the lower hopper 16, and the connecting tube 12 is connected to the lower hopper 16 through an elastic limiting ring 13. When the rotating rod 10 rotates, the rotating disk 11 is driven to rotate, so that the connecting tube 12 can be displaced, and the connecting tube 12 is displaced to the bottom of the lower hopper 16. The connecting tube 12 can be connected to the lower hopper 16 through the elastic connecting ring 17, and the electrical steel sheet is placed inside the lower hopper 16, so that the electrical steel sheet can be introduced into the inside of the connecting tube 12.

[0033] Secondly, an inclined groove 18 is provided at the bottom of the limiting ring 13, and the end of the closing cover 14 away from the connecting cylinder 12 is slidably connected to the limiting ring 13, and the closing cover 14 is connected to the connecting cylinder 12 through a torsion spring. The end of the rotating rod 10 away from the rotating disk 11 is fixedly connected to a driving gear 19, and the outer side of the driving gear 19 is meshed with a semicircular gear 20. The interior of the semicircular gear 20 is fixedly connected to the driving end of the first driving motor. Starting the first driving motor drives the semicircular gear 20 to rotate, so that the driving gear 19 rotates intermittently, driving the rotating rod 10 to rotate. When the electrical steel sheet is introduced into the interior of the connecting cylinder 12, the rotating disk 11 is rotated again to cause the connecting cylinder 12 to move to the interior of the guide frame 5. When the connecting cylinder 12 moves, the closing cover 14 is driven to rotate, so that the closing cover 14 is moved to the inclined groove 18, so that the limiting ring 13 on the closing cover 14 is cancelled, and the weight of the electrical steel sheet itself drives the closing cover 14 to rotate, so that the electrical steel sheet inside the connecting cylinder 12 is introduced into the interior of the guide frame 5.

[0034] The guide assembly 6 is used to guide the stator core wedge slot;

[0035] Furthermore, the guide assembly 6 is composed of a rotating block 21, a limiting rod 22, a connecting rod 23, a limiting block 24, a limiting groove 25, a clamping rod 26, a protrusion 27 and a driving block 28. The rotating block 21 is rotatably connected to the end of the guide frame 5 away from the rotating disk 11. Multiple groups of limiting rods 22 are all located on the outside of the rotating block 21, the connecting rod 23 is located inside the rotating block 21, the limiting block 24 is located at the end of the connecting rod 23 away from the rotating block 21, and multiple groups of limiting grooves 25 are all opened inside the limiting block 24. The clamping rod 26 is rotatably connected to the interior of the connecting shell 3 and close to the limiting block 24. The protrusion 27 is located at the end of the clamping rod 26 away from the limiting block 24. The driving block 28 is rotatably connected to the interior of the connecting shell 3 and close to the end of the protrusion 27. When the electrical steel sheet is introduced into the interior of the guide frame 5, it can be quantitatively introduced into the interior of the positioning assembly 7 for processing through the guide assembly 6.

[0036] Furthermore, the rotating block 21 is connected to the guide frame 5 through the limiting rod 22, the internal structure size of the limiting groove 25 is designed to correspond to the external structure size of the clamping rod 26, the clamping rod 26 is connected to the limiting block 24 through the limiting groove 25, the interior of the driving block 28 is fixedly connected to the driving end of the second driving motor, the outer side of the clamping rod 26 and one end close to the protrusion 27 is provided with a compression spring 29, and the end of the compression spring 29 away from the clamping rod 26 is connected to the connecting shell 3. When the electrical steel sheet is introduced into the interior of the guide frame 5, the second driving motor is started to drive the driving block 28 to rotate, so that the driving block 28 can contact the protrusion 27, and the clamping rod 2 is driven by the protrusion 27. 6 is rotated, so that the clamping rod 26 is rotated out from the inside of the limiting groove 25, thereby allowing the limiting block 24 to rotate, and the limiting rod 22 is driven to move by the weight of the electrical steel sheet itself, so that the electrical steel sheet can continue to move inside the guide frame 5. At this time, the continuous rotation of the driving block 28 causes the contact with the protrusion 27 to be disconnected, and the clamping rod 26 is driven to move by the compression spring 29, so that the clamping rod 26 is rotated to the inside of the limiting groove 25, limiting the limiting block 24, so that the rotating block 21 limits the limiting rod 22, and limits the electrical steel sheet, preventing the remaining electrical steel sheets from moving and affecting the processing of the electrical steel sheets.

[0037] The positioning component 7 is used to perform positioning and punching processing on the stator core wedge slot;

[0038] Furthermore, the positioning assembly 7 is composed of a positioning block 30, a first transmission rod 31, a second transmission rod 32 and a connecting block 33. Multiple groups of positioning blocks 30 are slidably connected to the top of the punching table 2, the first transmission rod 31 is rotatably connected to the bottom of the positioning block 30 and is located inside the punching table 2, the second transmission rod 32 is rotatably connected to the end of the first transmission rod 31 away from the positioning block 30, the connecting block 33 is located at the end of the multiple groups of second transmission rods 32 away from the first transmission rod 31, the second transmission rod 32 and the connecting block 33 are rotatably connected, and a telescopic cylinder is provided inside the punching table 2 and below the connecting block 33. The driving end of the telescopic cylinder is connected to the positioning block 30. Block 30 is connected. When the electrical steel sheet is introduced into the bottom of the punching block 9 through the guide frame 5, the telescopic cylinder is started to drive the positioning block 30 to move. When the positioning block 30 is displaced, the first transmission rod 31 is displaced, driving the second transmission rod 32 to move, causing the connecting block 33 to rotate, driving the remaining second transmission rods 32 to rotate, and causing the remaining first transmission rods 31 to rotate, thereby causing multiple groups of positioning blocks 30 to move, and the electrical steel sheet is limited and clamped, thereby positioning it. When the punching block 9 performs stamping processing on the electrical steel sheet, it can prevent it from being offset, which affects the processing effect.

[0039] In this embodiment, the implementation scenario is specifically as follows: in actual use, multiple groups of electrical steel sheets are placed inside the feeding assembly 4, the first driving motor is started, and the semicircular gear 20 is driven to rotate, so that the driving gear 19 rotates intermittently, and the rotating rod 10 is driven to rotate. When the rotating rod 10 rotates, the rotating disk 11 is driven to rotate, so that the connecting cylinder 12 can be displaced, and the connecting cylinder 12 is displaced to the bottom of the lower hopper 16. The connecting cylinder 12 is connected to the lower hopper 16 through the elastic connecting ring 17, and the electrical steel sheet is placed inside the lower hopper 16 so that the electrical steel sheet can be introduced into the interior of the connecting cylinder 12. When the electrical steel sheet is introduced into the connection When the connecting cylinder 12 is inside, the rotating disk 11 is rotated again to make the connecting cylinder 12 move to the inside of the guide frame 5. When the connecting cylinder 12 is moved, the closing cover 14 is driven to rotate, so that the closing cover 14 is moved to the inclined groove 18, so that the limit ring 13 on the closing cover 14 is cancelled, and the weight of the electrical steel sheet is used to drive the closing cover 14 to rotate, so that the electrical steel sheet inside the connecting cylinder 12 is introduced into the inside of the guide frame 5. When the electrical steel sheet is introduced into the inside of the guide frame 5, the second driving motor is started to drive the driving block 28 to rotate, so that the driving block 28 can contact the protrusion 27, and the protrusion 27 drives the clamping rod 26 to rotate, so that the clamping rod 26 The limit block 24 is rotated out from the inside of the limit groove 25, so that the limit block 24 can be rotated, and the limit rod 22 is driven to move by the weight of the electrical steel sheet itself, so that the electrical steel sheet can continue to move inside the guide frame 5. At this time, the continuous rotation of the driving block 28 causes the contact with the protrusion 27 to be disconnected, and the clamping rod 26 is driven to move by the compression spring 29, so that the clamping rod 26 rotates to the inside of the limit groove 25, limiting the limit block 24, so that the rotating block 21 limits the limit rod 22, limits the electrical steel sheet, prevents the remaining electrical steel sheets from moving, and affects the processing of the electrical steel sheet, and guides the electrical steel sheet into multiple sets of limit blocks. 24, start the telescopic cylinder to drive the positioning block 30 to move. When the positioning block 30 is displaced, the first transmission rod 31 is displaced, driving the second transmission rod 32 to move, causing the connecting block 33 to rotate, driving the remaining second transmission rods 32 to rotate, and causing the remaining first transmission rods 31 to rotate, thereby causing multiple groups of positioning blocks 30 to move, and the electrical steel sheet is limited and clamped, thereby positioning it. When the stamping block 9 performs stamping processing on the electrical steel sheet, it can prevent it from being offset, which affects the processing effect. Compared with existing processing equipment, the utility model can improve the overall practicality of the processing equipment through design.

[0040] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stator core wedge groove processing device for a permanent magnet brushless motor, comprising a workbench body (1), characterized in that: A punching platform (2) is provided on the top of the workbench body (1), a connecting shell (3) is provided on the outside of the punching platform (2) and located on the top of the workbench body (1), a feeding assembly (4) is provided inside the connecting shell (3), a guide frame (5) is provided on the outside of the feeding assembly (4), a guide frame (6) is provided at one end of the guide frame (5) away from the feeding assembly (4), a positioning assembly (7) is provided inside the punching platform (2), a connecting frame (8) is provided on the top of the workbench body (1) and located on the outside of the punching platform (2), and a punching block (9) is provided at one end of the connecting frame (8) close to the punching platform (2); The feeding assembly (4) is used for feeding the stator core wedge slot; The guide assembly (6) is used to guide the stator core wedge slot; The positioning assembly (7) is used to perform positioning and punching processing on the stator core wedge slot.

2. The stator core wedge groove processing equipment of a permanent magnet brushless motor according to claim 1, characterized in that: The feeding assembly (4) is composed of a rotating rod (10), a rotating disk (11), a connecting tube (12), a limiting ring (13) and a closing cover (14); the rotating rod (10) is rotatably connected to the inside of the connecting shell (3); the rotating disk (11) is fixedly connected to the outside of the rotating rod (10); the two groups of connecting tubes (12) are both located inside the rotating disk (11); the limiting ring (13) is rotatably connected to the outside of the rotating rod (10) and is located below the rotating disk (11); and the closing cover (14) is rotatably connected to one end of the connecting tube (12) away from the rotating disk (11).

3. The stator core wedge groove processing equipment of a permanent magnet brushless motor according to claim 2, characterized in that: A fixed disk (15) is provided inside the connecting shell (3) and above the rotating disk (11); a lower hopper (16) is provided on the outer side of the connecting shell (3); an elastic connecting ring (17) is provided at one end of the connecting tube (12) close to the lower hopper (16); and the connecting tube (12) is connected to the lower hopper (16) via an elastic limiting ring (13).

4. The stator core wedge groove processing equipment for a permanent magnet brushless motor according to claim 2, characterized in that: An inclined groove (18) is provided at the bottom of the limiting ring (13); an end of the closing cover (14) away from the connecting cylinder (12) is slidably connected to the limiting ring (13), and the closing cover (14) is connected to the connecting cylinder (12) via a torsion spring; an end of the rotating rod (10) away from the rotating disk (11) is fixedly connected to a driving gear (19); an outer side of the driving gear (19) is meshedly connected to a semicircular gear (20); and an inner side of the semicircular gear (20) is fixedly connected to a driving end of a first driving motor.

5. The stator core wedge groove processing equipment for a permanent magnet brushless motor according to claim 1, characterized in that: The guide assembly (6) is composed of a rotating block (21), a limiting rod (22), a connecting rod (23), a limiting block (24), a limiting groove (25), a clamping rod (26), a protrusion (27) and a driving block (28). The rotating block (21) is rotatably connected to the end of the guide frame (5) away from the rotating disk (11). The plurality of groups of limiting rods (22) are all located outside the rotating block (21). The connecting rod (23) is located inside the rotating block (21). The limit block (24) is located at one end of the connecting rod (23) away from the rotating block (21), and the plurality of limit grooves (25) are all opened inside the limit block (24). The clamping rod (26) is rotatably connected to the inside of the connecting shell (3) and close to one end of the limit block (24). The protrusion (27) is located at one end of the clamping rod (26) away from the limit block (24), and the driving block (28) is rotatably connected to the inside of the connecting shell (3) and close to one end of the protrusion (27).

6. The stator core wedge groove processing equipment for a permanent magnet brushless motor according to claim 5, characterized in that: The rotating block (21) is connected to the guide frame (5) via a limiting rod (22); the internal structure size of the limiting groove (25) is designed to correspond to the external structure size of the clamping rod (26); the clamping rod (26) is connected to the limiting block (24) via the limiting groove (25); the driving end of the second driving motor is fixedly connected to the inside of the driving block (28); a compression spring (29) is provided on the outer side of the clamping rod (26) and at one end close to the protrusion (27); and the compression spring (29) is connected to the connecting shell (3) at one end away from the clamping rod (26).

7. The stator core wedge groove processing equipment for a permanent magnet brushless motor according to claim 1, characterized in that: The positioning assembly (7) is composed of a positioning block (30), a first transmission rod (31), a second transmission rod (32) and a connecting block (33). Multiple groups of the positioning blocks (30) are slidably connected to the top of the punching table (2). The first transmission rod (31) is rotatably connected to the bottom of the positioning block (30) and is located inside the punching table (2). The second transmission rod (32) is rotatably connected to one end of the first transmission rod (31) away from the positioning block (30). The connecting block (33) is located at one end of the multiple groups of second transmission rods (32) away from the first transmission rod (31). The second transmission rod (32) and the connecting block (33) are rotatably connected. A telescopic cylinder is provided inside the punching table (2) and below the connecting block (33). The driving end of the telescopic cylinder is connected to the positioning block (30).

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