Automobile end plate assembly welding clamp

Abstract

The invention discloses an automobile end plate assembly welding clamp, and relates to the technical field of automobile end plate production equipment.The automobile end plate assembly welding clamp comprises a mounting base and a workbench connected to the top of the mounting base, and further comprises a driving set vertically connected into the workbench in a sliding mode, and the driving set comprises at least four driving racks connected in a rectangular array; one side of the driving rack is in engaged connection with a transmission gear; according to the device, when the device faces a special-shaped automobile end plate workpiece, adjustment can be achieved through the rotating disc, the electromagnet, the reset spring, the second limiting block, the fixing block and other structures in the transmission gear. By controlling the electromagnet to be powered on and powered off, part of the first limiting blocks can be kept static, part of the first limiting blocks can work normally, the special-shaped end plate with one long side and one short side can be precisely attached to the shape of the special-shaped end plate, the problem that clamping is not stable or cannot be effectively clamped due to the irregular shape is solved, the adaptability and universality of the welding clamp to workpieces in different shapes are improved, and the welding clamp is suitable for being used for welding workpieces in different shapes. And diversified production requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive end plate production equipment, and specifically to a welding fixture for an automotive end plate assembly. Background Art

[0002] In the welding process of traditional automotive end plate assemblies, it is usually necessary to first weld some parts and then complete the welding of the overall assembly. Therefore, fixtures are often required to fix the parts. A reasonably designed and reliable welding fixture is one of the very important tools. An excellent welding fixture can ensure and improve product quality, improve labor productivity, improve working conditions, and reduce product costs.

[0003] The existing Chinese patent (Publication No.: CN212371515U) discloses a welding fixture for an automotive end plate assembly, specifically related to the field of production and processing, including an operating table. A slider is movably clamped on the top of the operating table. A chute is opened on the top of the operating table. The slider is movably clamped inside the chute. A first fixing fixture is fixedly installed on the top of the slider. Both ends of the top of the first fixing fixture are fixedly connected with telescopic rods.

[0004] The Chinese patent (Publication No.: CN107570942A) discloses a welding fixture for an automotive subframe assembly, including a bottom plate. A bracket is installed at the bottom end of the bottom plate. A horizontally arranged chute is clamped at the middle position of the top end of the bottom plate. A horizontally arranged first threaded rod and a second threaded rod are rotatably connected inside the chute. One end of the first threaded rod is welded to the second threaded rod. A driving motor is fixedly installed on one side side wall of the bottom plate through screws. The output shaft of the driving motor is connected to the first threaded rod. Symmetrically arranged movable blocks are threadedly connected to both the first threaded rod and the second threaded rod. The bottom ends of the two movable blocks are slidably connected inside the chute. Two symmetrically arranged connecting frames are welded to the sides of the two movable blocks close to each other. One end of the connecting frame is welded to a clamping frame. A movable rod is slidably connected to the top side wall of the clamping frame.

[0005] During the use of the above-mentioned equipment, either bilateral clamping members are arranged on the workbench to clamp both sides of the workpiece, or multiple clamping members are arranged on the workbench to clamp multiple positions of the workpiece. First, in the case of bilateral clamping, during the clamping process, due to the diverse shapes of automotive end plates, some end plates have asymmetric structures or irregular regions. When clamping bilaterally, for such irregularly shaped end plates, it is difficult to evenly distribute the clamping force only relying on the clamping forces on both sides, which easily leads to uneven stress on the end plate during welding. And the above-mentioned device uses multi-sided clamping, which requires sequentially opening multiple clamping members, undoubtedly affecting the overall time of clamping and welding. Summary of the Invention

[0006] The object of the present invention is to provide a welding fixture for an automobile end plate assembly to solve the problems raised in the above-mentioned background art.

[0007] To solve the above technical problems, a welding fixture for an automobile end plate assembly provided by the present invention includes a mounting base and a workbench connected to the top of the mounting base, and further includes a driving group vertically slidably connected in the workbench. The driving group includes at least four driving racks connected in a rectangular array. One side of the driving rack is meshed with a transmission gear. A first transmission plate is provided on the transmission gear. One end of the first transmission plate is rotatably connected to a fixed seat. A first limiting block for limiting the workpiece is connected to the top of the fixed seat. A driving mechanism for driving the driving group to move vertically is provided in the workbench.

[0008] Further, a turntable is rotatably connected in the transmission gear. A connecting column is connected to the turntable. The first transmission plate is rotatably connected to the connecting column. A fixed frame is connected to the turntable. A storage battery is connected in the fixed frame. One side of the storage battery is electrically connected to an electromagnet. The other side of the electromagnet is connected to a return spring. The other end of the return spring is connected to a second limiting block. A plurality of fixing blocks are connected to the first transmission plate and are distributed in a circumferential array centered on the central axis of the first transmission plate. Among them, two fixing blocks are used in cooperation to limit the second limiting block.

[0009] Further, the driving mechanism includes a connecting block connected to the bottom of the driving group. Two symmetrically arranged second transmission plates are rotatably connected to the connecting block. The other end of the second transmission plate is rotatably connected to a sliding seat. A bidirectional lead screw is rotatably connected in the workbench through a bearing. The sliding seat is threadedly connected to the bidirectional lead screw. A servo motor for driving the bidirectional lead screw to rotate is connected to one side of the workbench.

[0010] Further, one end of the first limiting block extends to the outside of the top of the workbench and is connected to a first telescopic cylinder. The telescopic end of the first telescopic cylinder is connected to a mounting seat. One side of the mounting seat is connected to a self-locking motor. The driving end of the self-locking motor is connected to a mounting block.

[0011] Further, a clamping member is inserted into the mounting block. A limiting screw for limiting the clamping member is threadedly connected to the mounting block.

[0012] Further, a first guide rod is connected in the workbench. The sliding seat is slidably connected to the first guide rod. A sliding opening adapted to the first guide rod is provided on the sliding seat.

[0013] Further, a support base is provided below the installation base. Two symmetrically arranged first support plates are slidably provided on the top of the support base. The other end of the first support plate is rotatably connected to the bottom of the installation base. A first connecting plate is connected between the two first support plates. A second telescopic cylinder is rotatably connected to the first connecting plate. Two symmetrically arranged second support plates are also rotatably connected to the support base. Among them, each first support plate and a second support plate correspond to each other to form a scissor-shaped support member. The other end of the second support plate is rotatably connected to the bottom of the installation base. A second connecting plate is connected between the two second support plates. The telescopic end of the second telescopic cylinder is rotatably connected to the second support plate.

[0014] Further, a rotating shaft is connected to one side of the transmission gear, and the other end of the rotating shaft is rotatably connected inside the workbench.

[0015] Further, a second guiding rod is connected to one side of the first limiting block. The second guiding rod is slidably connected to the inner wall of the workbench. A connecting groove adapted to the second guiding rod is opened inside the workbench.

[0016] Further, a plurality of guiding grooves adapted to the first limiting block are opened on the top of the workbench, and the plurality of guiding grooves are arranged in a cross shape.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the coordinated operation of at least four driving racks, transmission gears, first transmission plates, and first limiting blocks arranged in a rectangular array, the automotive end plate can be stably limited from multiple directions. Compared with the traditional bilateral clamping, this design can better adapt to the situation of diverse shapes, asymmetric structures, or the existence of special-shaped areas of automotive end plates. The vertical movement of the driving rack drives the transmission gear to rotate, and then the first limiting block moves, evenly distributing the clamping force, effectively preventing the end plate from displacing or deforming due to uneven force during the welding process, ensuring the welding quality, and improving the versatility of the fixture for various end plates.

[0018] 2. When facing special-shaped automotive end plate workpieces, the structures such as the turntable, electromagnet, return spring, second limiting block, and fixing block inside the transmission gear can be used for adjustment. By controlling the energization and de-energization of the electromagnet, some of the first limiting blocks can be kept stationary while some are working normally. For special-shaped end plates with one long side and one short side, their shapes can be accurately fitted, avoiding problems such as unstable clamping or ineffective clamping caused by irregular shapes, improving the adaptability and versatility of the welding fixture for workpieces with different shapes, and meeting the diverse production requirements.

[0019] 3. The first telescopic cylinder connected to the first limit block can adjust the position of the clamping member. The self-locking motor can adjust the angle of the clamping member. Moreover, the mounting block can facilitate the replacement of clamping members of different types or specifications through limit screws. During the welding process, according to the specific shape of the end plate and welding requirements, the position and angle of the clamping member can be precisely adjusted to make the clamping more stable and effectively improve the welding quality.

[0020] 4. The height of the workbench can be flexibly adjusted. According to the actual welding work requirements, start the second telescopic cylinder. Its telescopic action drives the scissor-shaped support member to expand or contract, thereby adjusting the height of the workbench to adapt to the heights of different operators and different welding equipment layouts. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is the first cross-sectional view of the present invention Figure 3 is the second cross-sectional view of the present invention; Figure 4 is the plan view of the present invention; Figure 5 is the present invention Figure 3 the enlarged view of the structure at A in; Figure 6 is the present invention Figure 4 the enlarged view of the structure at B in; Figure 7 is the present invention Figure 4 the enlarged view of the structure at C in; Figure 8 is the present invention Figure 1 the enlarged view of the structure at D in.

[0022] In the figures: 1. Mounting base; 21. Driving rack; 22. Transmission gear; 23. First transmission plate; 24. Fixed seat; 25. First limit block; 31. Turntable; 32. Fixed frame; 33. Storage battery; 34. Electromagnet; 35. Return spring; 36. Second limit block; 37. Connecting column; 38. Fixed block; 41. Connecting block; 42. Second transmission plate; 43. Sliding seat; 44. Bidirectional lead screw; 45. Servo motor; 51. First telescopic cylinder; 52. Mounting seat; 53. Self-locking motor; 54. Mounting block; 6. Clamping member; 7. Limit screw; 8. First guide rod; 91. Support base; 92. First support plate; 93. First connecting plate; 94. Second telescopic cylinder; 95. Second support plate; 96. Second connecting plate; 10. Rotating shaft; 11. Second guide rod; 12. Workbench. DETAILED DESCRIPTION OF THE INVENTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figure 1-8 , the present invention provides a technical solution: a welding fixture for an automotive end plate assembly, including a mounting base 1 and a workbench 12 connected to the top of the mounting base 1. It further includes a driving group vertically slidably connected in the workbench 12. The driving group includes at least four driving racks 21 connected in a rectangular array. One side of the driving rack 21 is meshed with a transmission gear 22. A first transmission plate 23 is provided on the transmission gear 22. One end of the first transmission plate 23 is rotatably connected to a fixed seat 24. A first limiting block 25 for limiting the workpiece is connected to the top of the fixed seat 24. A driving mechanism for driving the driving group to move vertically is provided in the workbench 12; The driving mechanism includes a connecting block 41 connected to the bottom of the driving group. Two symmetrically arranged second transmission plates 42 are rotatably connected to the connecting block 41. The other end of the second transmission plate 42 is rotatably connected to a sliding seat 43. A bidirectional lead screw 44 is rotatably connected in the workbench 12 through a bearing. The sliding seat 43 is threadedly connected to the bidirectional lead screw 44. A servo motor 45 for driving the bidirectional lead screw 44 to rotate is connected to one side of the workbench 12.

[0025] During specific implementation, the servo motor 45 is started to drive the bidirectional lead screw 44 to rotate. Since the sliding seat 43 is threadedly connected to the bidirectional lead screw 44, the two sliding seats 43 will move towards or away from each other. The sliding seat 43 drives the connecting block 41 to move vertically through the second transmission plate 42. The connecting block 41 is connected to the driving group, and then drives at least four driving racks 21 distributed in a rectangular array to move vertically. When the driving rack 21 moves, the transmission gear 22 meshed with it rotates. The first transmission plate 23 on the transmission gear 22 rotates with it. One end of the first transmission plate 23 is rotatably connected to the fixed seat 24, driving the first limiting block 25 to move, realizing the limiting of the workpiece. This setting can stably limit the workpiece from multiple directions. Compared with bilateral clamping, it can better adapt to the situation of diverse shapes, asymmetric structures or special-shaped areas of automotive end plates, making the clamping force evenly distributed, and preventing the end plate from displacing or deforming due to uneven force during the welding process.

[0026] Please refer to Figure 1-8, a turntable 31 is rotatably connected inside the transmission gear 22. A connecting column 37 is connected to the turntable 31. The first transmission plate 23 is rotatably connected to the connecting column 37. A fixed frame 32 is connected to the turntable 31. A storage battery 33 is connected inside the fixed frame 32. One side of the storage battery 33 is electrically connected to an electromagnet 34. The other side of the electromagnet 34 is connected to a return spring 35. The other end of the return spring 35 is connected to a second limit block 36. A plurality of fixed blocks 38 are connected to the first transmission plate 23 and are distributed in a circumferential array centered on the central axis of the first transmission plate 23. Among them, two fixed blocks 38 are used in cooperation to limit the second limit block 36.

[0027] During specific implementation, when encountering special-shaped automotive end plate workpieces, such as those with one long side and one short side, during the clamping operation, it is necessary to flexibly adjust the movement of some of the first limit blocks 25. At this time, the electromagnet 34 is powered on, and the electromagnet 34 generates a magnetic field, attracting the second limit block 36 to overcome the elastic force of the return spring 35 and move it towards the electromagnet 34. The second limit block 36 disengages from between the two originally inserted fixed blocks 38 and no longer limits the first transmission plate 23. When the driving rack 21 continues to move and drives the transmission gear 22 to rotate, since the second limit block 36 does not contact the fixed block 38, the transmission gear 22 cannot drive the first transmission plate 23 to rotate through the fixed block 38, that is, the transmission gear 22 idles. The first limit block 25 corresponding to this transmission gear 22 will not move with the rotation of the transmission gear 22 and remains stationary. For the other side that does not need to be adjusted, the electromagnet 34 is not powered on, and the second limit block 36 is inserted between the fixed blocks 38 under the action of the return spring 35 to limit the rotation of the first transmission plate 23. When the driving rack 21 drives the transmission gear 22 to rotate, the first transmission plate 23 rotates accordingly, and then drives the corresponding first limit block 25 to move normally, realizing the normal clamping of the workpiece. This setting can flexibly control the transmission relationship between the transmission gear 22 and the first transmission plate 23 by controlling the power on and off of the electromagnet 34, making some of the first limit blocks 25 remain stationary while the other first limit blocks 25 work normally, so as to better fit the shape of the special-shaped workpiece and achieve stable clamping of the special-shaped workpiece. It avoids the situation of unstable clamping or ineffective clamping caused by the irregular shape of the special-shaped workpiece, and improves the adaptability and versatility of the welding fixture to workpieces of different shapes.

[0028] Please refer to Figure 1-8 , one end of the first limit block 25 extends to the outside of the top of the workbench 12 and is connected to a first telescopic cylinder 51. The telescopic end of the first telescopic cylinder 51 is connected to a mounting seat 52. One side of the mounting seat 52 is connected to a self-locking motor 53. The driving end of the self-locking motor 53 is connected to a mounting block 54.

[0029] During specific implementation, the first telescopic cylinder 51 is activated, and its telescopic end drives the movement of the mounting base 52, thereby driving the movement of the self-locking motor 53 and the mounting block 54. When it is necessary to adjust the angle of the clamping member 6, the self-locking motor 53 is activated, and its driving end drives the mounting block 54 to rotate, realizing the adjustment of the angle of the clamping member 6. This setting can flexibly adjust the position and angle of the clamping member 6, further enhancing the adaptability to automotive end plates of different shapes. During the welding process, the position and angle of the clamping member 6 can be precisely adjusted according to the specific shape and welding requirements of the end plate, making the clamping more stable and improving the welding quality.

[0030] Please refer to Figure 1-8 , a clamping member 6 is inserted into the mounting block 54, and a limit screw 7 for limiting the clamping member 6 is threadedly connected to the mounting block 54.

[0031] During specific implementation, the clamping member 6 is inserted into the slot of the mounting block 54. By tightening the limit screw 7, its end abuts against the clamping member 6 to limit and fix the clamping member 6. When it is necessary to replace the clamping member 6 of different types or specifications, loosen the limit screw 7, and the original clamping member 6 can be taken out and a new clamping member 6 can be replaced. This setting facilitates the replacement of different clamping members 6 to adapt to automotive end plates of different materials, shapes, and sizes.

[0032] Please refer to Figure 1-8 , a first guide rod 8 is connected inside the workbench 12, and the sliding seat 43 is slidably connected to the first guide rod 8. A sliding opening adapted to the first guide rod 8 is provided on the sliding seat 43.

[0033] During specific implementation, when the sliding seat 43 moves driven by the bidirectional lead screw 44, since the first guide rod 8 passes through the sliding opening provided on the sliding seat 43, the first guide rod 8 provides a guiding function for the movement of the sliding seat 43, ensuring that the sliding seat 43 moves smoothly along the axial direction of the first guide rod 8 without deviation or shaking.

[0034] Please refer to Figure 1-8 , a support base 91 is provided below the mounting base 1. Two symmetrically arranged first support plates 92 are slidably provided on the top of the support base 91. The other ends of the first support plates 92 are rotatably connected to the bottom of the mounting base 1. A first connecting plate 93 is connected between the two first support plates 92. A second telescopic cylinder 94 is rotatably connected to the first connecting plate 93. Two symmetrically arranged second support plates 95 are also rotatably connected to the support base 91. Among them, each first support plate 92 and a second support plate 95 correspond to each other to form a scissor-shaped support member. The other ends of the second support plates 95 are rotatably connected to the bottom of the mounting base 1. A second connecting plate 96 is connected between the two second support plates 95. The telescopic end of the second telescopic cylinder 94 is rotatably connected to the second support plate 95.

[0035] During specific implementation, the second telescopic cylinder 94 is activated, and its telescopic end pushes the second support plate 95 to rotate around its rotation point with the support base 91. Since the first support plate 92 and the second support plate 95 correspond to each other to form a scissors-shaped support member, and one end of the first support plate 92 is slidably connected to the support base 91, the other end is rotatably connected to the mounting base 1, and the other end of the second support plate 95 is also rotatably connected to the mounting base 1, the telescopic movement of the second telescopic cylinder 94 drives the scissors-shaped support member to expand or contract, thereby adjusting the height of the mounting base 1 and the workbench 12. This setting can flexibly adjust the height of the workbench 12 according to the actual welding work requirements to adapt to the heights of different operators and different welding equipment layouts.

[0036] Please refer to Figure 1-8 , one side of the transmission gear 22 is connected to a rotating shaft 10, and the other end of the rotating shaft 10 is rotatably connected inside the workbench 12.

[0037] During specific implementation, when the transmission gear 22 rotates driven by the driving rack 21, the rotating shaft 10 connected to one side of the transmission gear 22 rotates around its rotation point inside the workbench 12, providing support and stability for the rotation of the transmission gear 22 and ensuring that the transmission gear 22 can smoothly mesh and drive with the driving rack 21.

[0038] Please refer to Figure 1-8 , one side of the first limit block 25 is connected to a second guide rod 11, and the second guide rod 11 is slidably connected to the inner wall of the workbench 12. A connecting groove adapted to the second guide rod 11 is formed inside the workbench 12.

[0039] During specific implementation, when the first limit block 25 moves driven by the transmission gear 22, the second guide rod 11 connected to one side of the first limit block 25 slides in the connecting groove formed in the inner wall of the workbench 12, providing guidance for the movement of the first limit block 25.

[0040] Please refer to Figure 1-8 , a plurality of guide grooves adapted to the first limit block 25 are formed at the top of the workbench 12, and the plurality of guide grooves are arranged in a cross shape.

[0041] During specific implementation, during the movement of the first limit block 25, it can move along the cross-shaped guide grooves formed at the top of the workbench 12. The guide grooves provide guidance for the movement of the first limit block 25, restricting its movement direction and ensuring that the first limit block 25 can accurately perform the limiting operation on the workpiece.

[0042] Working principle: Preparation stage If the automotive end plate to be welded is of a conventional shape, roughly estimate its placement position on the workbench 12 and preliminarily determine the starting positions of the first limit blocks 25. If it is a special-shaped workpiece, analyze its shape characteristics in advance and plan which first limit blocks 25 need to remain stationary and which need to work normally for subsequent adjustment. At the same time, according to the operator's height, start the second telescopic cylinder 94 to adjust the height of the workbench 12. After the second telescopic cylinder 94 is started, its telescopic end pushes the second support plate 95 to rotate around the rotation point with the support base 91. Since the first support plate 92 and the second support plate 95 form a scissor-shaped support member and their connection methods with the mounting base 1 and the support base 91 are specific, the scissor-shaped support member expands or contracts, thereby realizing flexible adjustment of the height of the workbench 12.

[0043] Place the automotive end plate on the workbench 12 and start the servo motor 45. The output shaft of the servo motor 45 drives the bidirectional lead screw 44 to rotate, and the two sliding seats 43 threadedly connected thereto will move towards or away from each other. The sliding seat 43 drives the connecting block 41 to move vertically through the second transmission plate 42, and the connecting block 41 further drives at least four drive racks 21 distributed in a rectangular array to move vertically.

[0044] The drive rack 21 moves vertically, meshes with the transmission gear 22, and drives the transmission gear 22 to rotate. The rotation of the transmission gear 22 drives the first transmission plate 23 to rotate. One end of the first transmission plate 23 is rotatably connected to the fixed seat 24, driving the first limit block 25 at the top of the fixed seat 24 to move and clamp the workpiece.

[0045] If encountering a special-shaped automotive end plate workpiece, such as a situation where one side is long and the other side is short, flexibly adjust the actions of some first limit blocks 25. Energize the electromagnet 34 in the fixed frame 32 on the inner turntable 31 of the transmission gear 22 at the corresponding position. The electromagnet 34 generates a magnetic field, attracting the second limit block 36 to overcome the elastic force of the return spring 35 and move towards the electromagnet 34. The second limit block 36 disengages from between the two fixed blocks 38 where it was originally inserted and no longer limits the first transmission plate 23. When the drive rack 21 continues to move and drives the transmission gear 22 to rotate, the transmission gear 22 idles because the second limit block 36 is not in contact with the fixed block 38 and cannot drive the first transmission plate 23 to rotate through the fixed block 38, and the corresponding first limit block 25 remains stationary. On the other side that does not need to be adjusted, the electromagnet 34 is not energized, and the second limit block 36 is inserted between the fixed blocks 38 under the action of the return spring 35, restricting the rotation of the first transmission plate 23. When the drive rack 21 drives the transmission gear 22 to rotate, the first transmission plate 23 rotates accordingly, driving the corresponding first limit block 25 to move normally and realizing normal clamping of the workpiece.

[0046] When it is necessary to adjust the angle of the clamping member 6, start the self-locking motor 53, and its driving end drives the mounting block 54 to rotate, so as to realize the adjustment of the angle of the clamping member 6. If it is necessary to replace the clamping member 6 of different types or specifications, take out the clamping member 6 from the slot of the mounting block 54, loosen the limit screw 7 to replace it, and then tighten the limit screw 7 to limit and fix the new clamping member 6. Through these operations, according to the specific shape and welding requirements of the end plate, accurately adjust the position and angle of the clamping member 6 to make the clamping more stable and improve the welding quality.

Claims

1. A welding fixture for an automobile end plate assembly, comprising a mounting base (1) and a workbench (12) connected to the top of the mounting base (1), characterized in that: The invention also comprises a drive group vertically slidably connected to the workbench (12), the drive group comprising at least four drive racks (21) connected in a rectangular array, one side of the drive rack (21) being meshingly connected to a transmission gear (22), a first transmission plate (23) being provided on the transmission gear (22), one end of the first transmission plate (23) being rotatably connected to a fixed seat (24), a first limit block (25) for limiting the position of a workpiece being connected to the top of the fixed seat (24), and a drive mechanism for driving the drive group to move vertically is provided in the workbench (12).

2. The automobile end plate assembly welding fixture according to claim 1, characterized in that: A rotating disk (31) is rotatably connected inside the transmission gear (22), a connecting column (37) is connected to the rotating disk (31), the first transmission plate (23) is rotatably connected to the connecting column (37), a fixing frame (32) is connected to the rotating disk (31), a storage battery (33) is connected inside the fixing frame (32), one side of the storage battery (33) is electrically connected to an electromagnet (34), the other side of the electromagnet (34) is connected to a return spring (35), the other end of the return spring (35) is connected to a second limit block (36), and a plurality of fixed blocks (38) are connected to the first transmission plate (23) and are distributed in a circumferential array with the central axis of the first transmission plate (23) as the center, wherein two fixed blocks (38) are used in combination to limit the second limit block (36).

3. The automobile end plate assembly welding fixture according to claim 1, characterized in that: The driving mechanism comprises a connecting block (41) connected to the bottom of the driving group, two second transmission plates (42) symmetrical to each other are rotatably connected to the connecting block (41), the other end of the second transmission plate (42) is rotatably connected to a sliding seat (43), a bidirectional screw rod (44) is rotatably connected to the workbench (12) via a bearing, the sliding seat (43) is threadedly connected to the bidirectional screw rod (44), and a servo motor (45) for driving the bidirectional screw rod (44) to rotate is connected to one side of the workbench (12).

4. The automobile end plate assembly welding fixture according to claim 1, characterized in that: One end of the first limit block (25) extends to the outside of the top of the workbench (12) and is connected to a first telescopic cylinder (51); the telescopic end of the first telescopic cylinder (51) is connected to a mounting seat (52); one side of the mounting seat (52) is connected to a self-locking motor (53); and the driving end of the self-locking motor (53) is connected to a mounting block (54).

5. The automobile end plate assembly welding fixture according to claim 4, characterized in that: A clamping piece (6) is inserted into the mounting block (54), and a limiting screw (7) for limiting the position of the clamping piece (6) is threadedly connected to the mounting block (54).

6. The automobile end plate assembly welding fixture according to claim 3, characterized in that: A first guide rod (8) is connected inside the workbench (12), the sliding seat (43) is slidably connected to the first guide rod (8), and a sliding opening adapted to the first guide rod (8) is provided on the sliding seat (43).

7. The automobile end plate assembly welding fixture according to claim 1, characterized in that: A support base (91) is provided below the mounting base (1), and two mutually symmetrical first support plates (92) are slidably provided on the top of the support base (91), the other end of the first support plate (92) is rotatably connected to the bottom of the mounting base (1), a first connecting plate (93) is connected between the two first support plates (92), a second telescopic cylinder (94) is rotatably connected to the first connecting plate (93), and two mutually symmetrical second support plates (95) are also rotatably connected to the support base (91), wherein each first support plate (92) and a second support plate (95) correspond to each other to form a scissor-shaped support member, the other end of the second support plate (95) is rotatably connected to the bottom of the mounting base (1), a second connecting plate (96) is connected between the two second support plates (95), and the telescopic end of the second telescopic cylinder (94) is rotatably connected to the second support plate (95).

8. The automobile end plate assembly welding fixture according to claim 1, characterized in that: One side of the transmission gear (22) is connected to a rotating shaft (10), and the other end of the rotating shaft (10) is rotatably connected inside the workbench (12).

9. The automobile end plate assembly welding fixture according to claim 1, characterized in that: A second guide rod (11) is connected to one side of the first limit block (25), the second guide rod (11) is slidably connected to the inner wall of the workbench (12), and a connection groove adapted to the second guide rod (11) is provided in the workbench (12).

10. The automobile end plate assembly welding fixture according to claim 1, characterized in that: A plurality of guide grooves adapted to the first limit block (25) are provided on the top of the workbench (12), and the plurality of guide grooves are arranged in a cross shape.

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