Welding table for automobile ignition coil

Abstract

The invention discloses a welding table for an automobile ignition coil, and belongs to the technical field of automobile accessory machining, the welding table comprises a bottom plate, the lower surface of the bottom plate is fixedly connected with a support, the upper surface of the bottom plate is fixedly connected with a fence, the inner wall of the fence is in bolted connection with a mechanical arm, and the tail end of the mechanical arm is in bolted connection with a welding head; a motor is connected to the outer wall of the fence through bolts. The device further comprises an external connecting plate, the external connecting plate is fixedly connected to the surface of the working plate, and a connecting shaft is rotationally arranged in the external connecting plate. According to the welding table for the automobile ignition coil, when the welding table works and the automobile ignition coil needs to be clamped, a motor needs to be started, at the moment, a side plate moves towards the middle of a bottom plate under the action of a threaded rod and a limiting rod, then a working plate and a clamping plate on the left side and the right side get close to each other, finally, a workpiece is clamped and fixed through the clamping plate, and the operation process is rapid and convenient; the working efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts processing, in particular to a welding table for automobile ignition coils. Background Art

[0002] The processing of auto parts lays the foundation for the subsequent overall production and manufacturing of automobiles. Each auto part directly affects the performance and safety of the entire vehicle. Auto parts include intake valves, engines, cylinder blocks, and automobile ignition coils. When processing automobile ignition coils, a welding table is required. When welding automobile ignition coils, the stability of the electrical connection of the automobile ignition coils can be improved. The welding process provides a reliable electrical path, and the welding process also improves the durability and reliability of the automobile ignition coils, thereby extending the service life of the automobile ignition coils.

[0003] When the welding table is working, it is necessary to quickly clamp the automobile ignition coil. Due to differences in vehicle models, the sizes of automobile ignition coils will also be different. At the same time, due to differences in engine types and performance differences, the sizes of automobile ignition coils will also be different. Therefore, the welding table needs to quickly adapt to automobile ignition coils of different sizes, otherwise it will affect the processing efficiency. In order to overcome the above-mentioned defects, prior art 1 (application number CN202023141127.5, Chinese patent application date 2020-12-22) is a welding table for automobile ignition coils. It uses a connecting plate and a screw rod in a connection and installation manner in conjunction with the use of a driving structure. When the welding table is used to fix the automobile ignition coil during welding, the staff only needs to place the ignition coil directly on the placement table, so that the longer sides of the automobile ignition coil can be clamped and fixed by relative fixing blocks without deliberate adjustment. The placement of the ignition coil can make it clamped and fixed, thereby simplifying the use steps of the welding table and improving the overall work efficiency of the welding process. The Chinese patent of prior art 2 (application number CN202220171991.X, application date 2022-01-22) is a welding table for automobile ignition coils. After pulling outwards through two sets of clamps, the ignition coil can be placed in the clamps and released. At this time, the clamps can be pushed to clamp the ignition coil by the rebound of the spring. The clamping operation is simple and convenient, stable and reliable, and greatly improves the welding efficiency. The exhaust fan can be started during welding. At this time, the smoke generated by welding can be drawn in through the smoke inlet and finally discharged through the hose, and the hose can be connected to the outdoors, thereby avoiding the damage of welding smoke in the factory to the human body, improving the production environment, and improving the protection of workers. There is also prior art 3 (application number CN202420243509.8, Chinese patent with application date of 2024-01-31) An automobile ignition coil welding table, which places the ignition coil between a first rotating plate and a second rotating plate, rotates a hand wheel to drive the screw to rotate, the screw drives the first slider and the second slider thereon to move relative to each other synchronously, the first slider and the second slider drive the first clamping plate and the second clamping plate to move relative to each other synchronously, the first clamping plate and the second clamping plate drive the first rotating plate and the second rotating plate to move relative to each other synchronously, until the first rotating plate and the second rotating plate clamp the ignition coil welding part, so that the ignition coil is clamped and fixed between the first rotating plate and the second rotating plate, which is beneficial to improve the clamping efficiency The rate is low, and harmful gases will be generated during the welding process. The smoke generated during the welding process contains particulate matter, which will affect the operator's respiratory tract and lungs. It also contains carcinogens. Long-term inhalation of these particles may increase the risk of cancer. During use, the device in the above application exhausts through a single fan, and the work efficiency is average. It does not have a good smoke exhaust structure, which will affect the health of the operator. At the same time, during the welding process, more welding slag will be generated. During use, the device in the above application does not have a welding exhaust collection function, which increases the subsequent workload of the staff. . Summary of the invention

[0004] The purpose of the present invention is to provide a welding table for automobile ignition coils to solve the problems proposed in the above background technology that the welding table does not have a good smoke exhaust structure, which affects the health of the operator and does not have a welding exhaust collection function during use, which increases the subsequent workload of the staff.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a welding table for an automobile ignition coil, comprising a base plate, a bracket fixedly connected to the lower surface of the base plate, and a fence fixedly connected to the upper surface of the base plate, a mechanical arm bolted to the inner wall of the fence, and a welding head bolted to the end of the mechanical arm, and a motor bolted to the outer wall of the fence; a threaded rod, the threaded rod is fixedly connected to the output end of the motor, and the surface of the threaded rod is threadedly connected to a side plate, the surface of the side plate is fixedly connected to a working plate, and the surface of the working plate is fixedly connected to a clamping plate, and a gas exhaust assembly is arranged on the surface of the working plate; the gas exhaust assembly includes an adsorption head rotatably arranged on the surface of the working plate; a material receiving plate, the material receiving plate is movably arranged on the upper surface of the base plate, and a material unloading assembly is arranged on the material receiving plate, and the material unloading assembly includes an upper connecting block fixedly connected to the upper surface of the material receiving plate; an external connecting plate, the external connecting plate is fixedly connected to the surface of the working plate, and a connecting shaft is rotatably arranged inside the external connecting plate.

[0006] Preferably, a limit rod is fixedly connected to the inner wall of the enclosure, and the limit rod passes through the inside of the side plate, and the limit rod and the side plate are slidably connected.

[0007] Preferably, the side plates are symmetrically distributed about the center of the threaded rod, and the threads on the left and right sides of the threaded rod have opposite rotation directions.

[0008] Preferably, the gas exhaust assembly further comprises a first bevel gear fixedly connected to the upper surface of the connecting shaft, a traction rope is fixedly connected to the inner wall of the enclosure, and the other side of the traction rope is wound and fixedly connected to the surface of the connecting shaft.

[0009] Preferably, a long pin is rotatably provided inside the working plate, and the end of the long pin is fixedly connected to a second bevel gear meshing with the first bevel gear.

[0010] Preferably, a cam is fixedly connected to the surface of the long pin, a connecting rod is fixedly connected to the surface of the working plate, and the connecting rod is an inverted "L" structure when viewed from the front, and a force-bearing plate is slidably provided on the surface of the connecting rod, and a push rod is fixedly connected to the upper surface of the force-bearing plate.

[0011] Preferably, an auxiliary rod is fixedly connected to the surface of the working plate, and the auxiliary rod is an inverted "U" shape when viewed from above, and a pipe sleeve is fixedly connected to the surface of the auxiliary rod, and the surface of the pipe sleeve is fixedly connected to the adsorption head, and a delivery pipe is fixedly connected to the surface of the adsorption head, and the delivery pipe is connected to the output end of the gas treatment device through an external hose, and a positioning plate is fixedly connected to the surface of the working plate.

[0012] Preferably, the blanking assembly includes a circular plate fixedly connected to the lower surface of the connecting shaft, and a fixed block is fixedly connected to the lower surface of the circular plate, and the fixed block is a hemispherical structure, and the fixed blocks are evenly spaced on the lower surface of the circular plate.

[0013] Preferably, the upper connecting block is symmetrically distributed about the center of the receiving plate, and the upper surface of the receiving plate is an arc-shaped structure, the upper surface of the bottom plate is fixedly connected with a column, and the column passes through the interior of the receiving plate, and the upper surface of the column is fixedly connected with a baffle, the lower surface of the receiving plate is fixedly connected with a connecting spring, and the other side of the connecting spring is fixedly connected to the upper surface of the bottom plate, and a feeding port is opened on the surface of the bottom plate.

[0014] Preferably, a torsion spring having an elastic reset function is fixedly connected to the surface of the connecting shaft, and the other side of the torsion spring is fixedly connected to the inner wall of the external connecting plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the welding table for automobile ignition coil adopts a new structural design, and the working plates and the clamping plates on the left and right sides are close to each other through the motor, the side plate, the threaded rod and the limit rod, and finally the clamping plate clamps and fixes the workpiece, and a gas exhaust component is also provided, so that the harmful gas in the welding process can be quickly discharged without affecting the health of the staff, and a material discharge component is also provided, so that the welding slag generated in the welding process can be quickly discharged without residue, which is convenient for the later cleaning of the staff and improves the work efficiency of the staff. The specific contents are as follows: (1) When the automobile ignition coil welding table is working and needs to clamp the automobile ignition coil, the motor needs to be started. At this time, the side plate moves to the middle position of the bottom plate under the action of the threaded rod and the limit rod, and then the working plates and the clamping plates on the left and right sides approach each other. Finally, the clamping plate clamps and fixes the workpiece. The operation process is quick and convenient, and the work efficiency is high.

[0016] Furthermore, after the workpiece is clamped and fixed, the welding head is controlled by the robot arm to achieve welding of the workpiece, which is easy to operate.

[0017] (2) When welding is in progress, the suction head of the welding table for automobile ignition coil can absorb the fume generated during the welding process, thereby optimizing the working environment of the staff and protecting the health of the staff.

[0018] Furthermore, after the welding is completed, the motor rotates, and the working plate moves back. When the working plate is driven to move by the side plate, the connecting shaft rotates inside the external plate under the action of the traction rope. At this time, the long pin rotates under the action of the first bevel gear and the second bevel gear, and then the force plate and the push rod make reciprocating linear motion in the vertical direction under the action of the cam, their own gravity and the connecting rod. At this time, the pipe sleeve and the suction head swing around the auxiliary rod under the thrust of the push rod and their own gravity. At this time, the working range of the suction head is increased, which can better absorb the smoke. When the positioning plate is working, it limits the maximum downward rotation angle of the suction head, thereby improving stability.

[0019] (3) When welding, the welding slag will fall onto the receiving plate, and the upper surface of the receiving plate is an arc-shaped structure, so that the receiving plate can quickly discharge the welding slag, which is convenient for the welding slag to be discharged from the discharge port, and then convenient for the staff to quickly collect it.

[0020] Furthermore, when the connecting shaft rotates, the connecting shaft drives the circular plate and the fixed block to rotate synchronously. When the fixed block rotates to push the upper connecting block, the upper connecting block and the material receiving plate descend under the action of the thrust. At this time, the connecting spring will be compressed, and when the fixed block continues to rotate until it does not push the upper connecting block, the material receiving plate returns to its original position under the action of the connecting spring, and then the material receiving plate is in a shaking state, which is convenient for quick material unloading, makes it easier to discharge the welding slag, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the connection structure between the base plate and the enclosure of the present invention; Figure 2 This is a schematic diagram of the connection structure between the enclosure and the mechanical arm of the present invention; Figure 3 This is a schematic diagram of the connection structure between the motor and the threaded rod of the present invention; Figure 4 This is a schematic diagram of the connection structure between the working plate and the clamping plate of the present invention; Figure 5 This is a schematic diagram of the working state structure of the adsorption head of the present invention; Figure 6 This is a schematic diagram of the structure of the adsorption head in the swing state of the present invention; Figure 7 It is a schematic diagram of the connection structure between the bottom plate and the material receiving plate of the present invention; Figure 8 For the present invention Figure 7 The enlarged structural diagram at A in the middle; Fig. 9 This is a schematic diagram of the structure of the upper connecting block of the present invention in a pressed state; Fig.10 It is a schematic diagram of the connection structure of the external plate, the torsion spring and the connecting shaft of the present invention.

[0022] In the figure: 1. bottom plate; 2. enclosure; 3. mechanical arm; 4. motor; 5. threaded rod; 6. working plate; 7. clamping plate; 8. receiving plate; 9. side plate; 10. limit rod; 11. external plate; 12. connecting shaft; 13. first bevel gear; 14. long pin; 15. second bevel gear; 16. cam; 17. force plate; 18. connecting rod; 19. suction head; 20. conveying pipe; 21. traction rope; 22. push rod; 23. auxiliary rod; 24. pipe sleeve; 25. positioning plate; 26. unloading port; 27. upper connecting block; 28. column; 29. ​​connecting spring; 30. baffle; 31. round plate; 32. fixing block; 33. torsion spring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention provides the following technical solution: a welding table for automobile ignition coil.

[0025] Embodiment 1: By setting the motor 4, the working plates 6 and the clamping plates 7 on the left and right sides can be brought closer to each other, and finally the workpiece can be clamped and fixed. Figure 1-Figure 3 As shown: it includes a bottom plate 1, a bracket is fixedly connected to the lower surface of the bottom plate 1, and a fence 2 is fixedly connected to the upper surface of the bottom plate 1, and a mechanical arm 3 is bolted to the inner wall of the fence 2, and the end of the mechanical arm 3 is bolted to the welding head, and a motor 4 and a threaded rod 5 are bolted to the outer wall of the fence 2, and the threaded rod 5 is fixedly connected to the output end of the motor 4, and the surface of the threaded rod 5 is threadedly connected to a side plate 9, and the surface of the side plate 9 is fixedly connected to a working plate 6, and the surface of the working plate 6 is fixedly connected to a clamping plate 7, and the surface of the working plate 6 is provided with a gas exhaust assembly, and the gas exhaust assembly includes a rotating arrangement on the working plate 6, a suction head 19 on the surface of the bottom plate 1, a receiving plate 8, the receiving plate 8 is movably arranged on the upper surface of the bottom plate 1, and a material unloading assembly is arranged on the receiving plate 8, and the material unloading assembly includes an upper connecting block 27 fixedly connected to the upper surface of the receiving plate 8, an external connecting plate 11, the external connecting plate 11 is fixedly connected to the surface of the working plate 6, and a connecting shaft 12 is rotatably arranged inside the external connecting plate 11, a limiting rod 10 is fixedly connected to the inner wall of the enclosure 2, and the limiting rod 10 passes through the inside of the side plate 9, and the limiting rod 10 and the side plate 9 are slidably connected, the side plates 9 are symmetrically distributed about the center of the threaded rod 5, and the threads on the left and right sides of the threaded rod 5 are opposite in rotation direction.

[0026] During work, when it is necessary to clamp the automobile ignition coil, the motor 4 needs to be started. At this time, the side plate 9 moves to the middle position of the bottom plate 1 under the action of the threaded rod 5 and the limit rod 10, and then the working plates 6 and the clamping plates 7 on the left and right sides approach each other, and finally the clamping plate 7 clamps and fixes the workpiece. The operation process is quick and convenient, and the work efficiency is high. After the workpiece is clamped and fixed, the welding head is controlled by the robot arm 3 to achieve welding of the workpiece, which is easy to operate.

[0027] Embodiment 2: Different from Embodiment 1, the harmful gas generated during welding can be quickly collected and discharged by setting the gas exhaust component, thus optimizing the working environment. Figure 4-Figure 6As shown: the gas exhaust assembly also includes a first bevel gear 13 fixedly connected to the upper surface of the connecting shaft 12, a traction rope 21 is fixedly connected to the inner wall of the enclosure 2, and the other side of the traction rope 21 is wrapped and fixedly connected to the surface of the connecting shaft 12, a long pin 14 is rotatably arranged inside the working plate 6, and the end of the long pin 14 is fixedly connected to a second bevel gear 15 meshing with the first bevel gear 13, a cam 16 is fixedly connected to the surface of the long pin 14, a connecting rod 18 is fixedly connected to the surface of the working plate 6, and the front view of the connecting rod 18 is an inverted "L" structure, and a force plate 17 is slidably arranged on the surface of the connecting rod 18, and a push rod 22 is fixedly connected to the upper surface of the force plate 17.

[0028] An auxiliary rod 23 is fixedly connected to the surface of the working plate 6, and the auxiliary rod 23 is an inverted "U" shape when viewed from above, and a pipe sleeve 24 is fixedly connected to the surface of the auxiliary rod 23, and the surface of the pipe sleeve 24 is fixedly connected to the adsorption head 19, and the surface of the adsorption head 19 is fixedly connected to the delivery pipe 20, and the delivery pipe 20 is connected to the output end of the gas treatment device through an external hose, and a positioning plate 25 is fixedly connected to the surface of the working plate 6.

[0029] When welding is in progress, the suction head 19 can absorb the fume generated during welding, optimize the working environment of the staff, and thus protect the health of the staff. After welding is completed, the motor 4 rotates, and the working plate 6 moves back. When the working plate 6 is driven to move by the side plate 9, the connecting shaft 12 rotates inside the external plate 11 under the action of the traction rope 21 and the torsion spring 33. At this time, the long pin 14 rotates under the action of the first bevel gear 13 and the second bevel gear 15. At this time, the long pin 14 drives the cam 16 to rotate synchronously. When the cam 16 rotates to push the force-bearing plate 17, the force-bearing plate 17 rises, and when the cam 16 continues to rotate to stop pushing the force-bearing plate 17, the force-bearing plate 17 descends under the action of its own gravity, and then the force-bearing plate 17 and the push rod 22 make reciprocating linear motion in the vertical direction under the action of the cam 16, their own gravity and the connecting rod 18. At this time, the pipe sleeve 24 and the adsorption head 19 swing around the auxiliary rod 23 under the action of the thrust of the push rod 22 and their own gravity. At this time, the working range of the adsorption head 19 is increased, which can better absorb the smoke.

[0030] Embodiment 3: Different from Embodiment 2, the welding slag in the welding process is quickly discharged by setting a material discharge assembly, so that it is convenient for the staff to collect it. Figure 7-10As shown, the blanking assembly includes a circular plate 31 fixedly connected to the lower surface of the connecting shaft 12, and the lower surface of the circular plate 31 is fixedly connected with a fixing block 32, and the fixing block 32 is a hemispherical structure, and the fixing blocks 32 are evenly spaced on the lower surface of the circular plate 31, the upper connecting blocks 27 are symmetrically distributed about the center of the receiving plate 8, and the upper surface of the receiving plate 8 is an arc structure, the upper surface of the bottom plate 1 is fixedly connected with a column 28, and the column 28 runs through the interior of the receiving plate 8, and the upper surface of the column 28 is fixedly connected with a baffle 30, the lower surface of the receiving plate 8 is fixedly connected with a connecting spring 29, and the other side of the connecting spring 29 is fixedly connected to the upper surface of the bottom plate 1, and a blanking port 26 is opened on the surface of the bottom plate 1, and the surface of the connecting shaft 12 is fixedly connected with a torsion spring 33 that plays an elastic reset role, and the other side of the torsion spring 33 is fixedly connected to the inner wall of the external connecting plate 11.

[0031] During welding, welding slag will fall onto the receiving plate 8, and the upper surface of the receiving plate 8 is an arc-shaped structure, so the receiving plate 8 can quickly discharge the welding slag, which is convenient for the welding slag to be discharged from the discharge port 26, and then it is convenient for the staff to quickly collect it. When the connecting shaft 12 rotates, the connecting shaft 12 drives the circular plate 31 and the fixed block 32 to rotate synchronously. When the fixed block 32 rotates to push the upper connecting block 27, the upper connecting block 27 and the receiving plate 8 descend under the thrust. At this time, the connecting spring 29 will be compressed, and when the fixed block 32 continues to rotate until it does not push the upper connecting block 27, the receiving plate 8 returns to its original position under the action of the connecting spring 29, and then the receiving plate 8 performs reciprocating linear motion in the vertical direction under the action of the thrust and elastic force as well as the column 28 and the baffle 30, that is, the receiving plate 8 is in a shaking state, which is convenient for rapid material discharge, makes it easier to discharge the welding slag, and improves work efficiency.

[0032] When the connecting shaft 12 rotates, the torsion spring 33 is stretched, and then the motor 4 rotates. When the working plate 6 and the external plate 11 move back, the connecting shaft 12 rotates under the action of the torsion spring 33. When the connecting shaft 12 rotates, the traction rope 21 is reeled in for the next use. At the same time, when the connecting shaft 12 rotates, the above process occurs again, thereby improving work efficiency.

[0033] The above is the working process of the entire device, and the contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

Claims

1. A welding table for an automobile ignition coil, comprising a base plate (1), the upper surface of the base plate (1) being connected to a fence (2), the inner wall of the fence (2) being connected to a mechanical arm (3), the end of the mechanical arm (3) being connected to a welding head, and the outer wall of the fence (2) being connected to a motor (4); It is characterized in that Also includes: The output end of the motor (4) is connected to a threaded rod (5), and the surface of the threaded rod (5) is connected to a side plate (9), and the surface of the side plate (9) is connected to a working plate (6), and the surface of the working plate (6) is connected to a clamping plate (7), and the surface of the working plate (6) is provided with a gas exhaust component, the gas exhaust component comprising an adsorption head (19) provided on the surface of the working plate (6), and the adsorption head (19) is in a swinging state when working; The upper surface of the bottom plate (1) is provided with a material receiving plate (8), and a material unloading assembly is provided on the material receiving plate (8), and the material unloading assembly comprises an upper connecting block (27) connected to the upper surface of the material receiving plate (8), and when the material receiving plate (8) is in operation, it performs reciprocating linear motion in the vertical direction.

2. The welding table for automobile ignition coil according to claim 1, characterized in that: An external plate (11) is fixedly connected to the surface of the working plate (6), and a connecting shaft (12) is rotatably arranged inside the external plate (11). The gas exhaust assembly also includes a first bevel gear (13) fixedly connected to the upper surface of the connecting shaft (12). A traction rope (21) is fixedly connected to the inner wall of the enclosure (2), and the other side of the traction rope (21) is wound and fixedly connected to the surface of the connecting shaft (12).

3. The welding table for automobile ignition coil according to claim 2, characterized in that: A connecting rod (18) is fixedly connected to the surface of the working plate (6), and the connecting rod (18) has an inverted "L" structure when viewed from the front. A force-bearing plate (17) is slidably provided on the surface of the connecting rod (18), and a push rod (22) is fixedly connected to the upper surface of the force-bearing plate (17).

4. The welding table for automobile ignition coil according to claim 3, characterized in that: The surface of the working plate (6) is fixedly connected to an auxiliary rod (23), and the auxiliary rod (23) is in an inverted "U" shape when viewed from above, and the surface of the auxiliary rod (23) is fixedly connected to a pipe sleeve (24), and the surface of the pipe sleeve (24) is fixedly connected to the adsorption head (19), the surface of the adsorption head (19) is fixedly connected to a delivery pipe (20), and the delivery pipe (20) is connected to the output end of the gas processing device through an external hose, and the surface of the working plate (6) is fixedly connected to a positioning plate (25).

5. The welding table for automobile ignition coil according to claim 4, characterized in that: The blanking assembly comprises a circular plate (31) fixedly connected to the lower surface of the connecting shaft (12), a fixing block (32) being fixedly connected to the lower surface of the circular plate (31), the fixing block (32) being a hemispherical structure, and the fixing blocks (32) being distributed at equal intervals on the lower surface of the circular plate (31).

6. The welding table for automobile ignition coil according to claim 5, characterized in that: The upper connecting blocks (27) are symmetrically distributed about the center of the material receiving plate (8), and the upper surface of the material receiving plate (8) is an arc-shaped structure.

7. The welding table for automobile ignition coil according to claim 1, characterized in that: A column (28) is fixedly connected to the upper surface of the bottom plate (1), and the column (28) passes through the interior of the material receiving plate (8), and a baffle (30) is fixedly connected to the upper surface of the column (28).

8. The welding table for automobile ignition coil according to claim 1, characterized in that: A connecting spring (29) is fixedly connected to the lower surface of the receiving plate (8), and the other side of the connecting spring (29) is fixedly connected to the upper surface of the bottom plate (1), and a material discharge port (26) is provided on the surface of the bottom plate (1).

9. The welding table for automobile ignition coil according to claim 2, characterized in that: A torsion spring (33) having an elastic reset function is fixedly connected to the surface of the connecting shaft (12), and the other side of the torsion spring (33) is fixedly connected to the inner wall of the external connecting plate (11).

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