A kind of automobile door hinge reinforcing plate welding auxiliary device

Abstract

The application relates to the field of welding fixtures, and discloses an automobile door hinge reinforcing plate welding auxiliary device which comprises a fixture base, a welding mechanical arm is arranged on the side of the fixture base, a brazing head is arranged at the end of the welding mechanical arm, and a plurality of clamping compensation devices are arranged on the top of the fixture base; the locking of the support block on the fixture is realized by rotating and extruding the following piece through the locking piece in the clamping compensation device, the rebound phenomenon of the support block on the fixture caused by shaking and welding stress in the welding process is prevented, then the compensation piece is rotated by extruding the adjusting piece through the following piece, so that the extension length of the second clamping column is adjusted, when the thickness of the automobile body is uneven, the clamping force of the compensation piece and the support block on the fixture on the automobile body is adjusted by rotating the compensation piece, the compensation effect in the multi-point clamping is realized, and the stability of the reinforcing plate welding is improved.

Description

Technical Field

[0001] This invention relates to the field of welding fixture technology, and more specifically, to a welding auxiliary device for automotive door hinge reinforcement plates. Background Technology

[0002] Automotive door hinge reinforcement plates are metal reinforcing components welded between the inner door panel and the hinge mounting position, typically made of high-strength steel through stamping. Their core function is to enhance the local stiffness and impact resistance of the hinge connection area, ensuring that the hinge will not tear or shift during frequent opening and closing or side impacts, thereby guaranteeing the vertical support accuracy and collision safety of the door. To accurately and firmly weld the reinforcement plate to the inner door panel, a welding auxiliary device is required. This device typically consists of a positioning fixture, a clamping mechanism, and a welding guide groove, which quickly fixes the relative position of the reinforcement plate and the inner door panel, preventing thermal deformation or displacement during the welding process. It ensures both weld uniformity and structural strength, and significantly improves the efficiency and yield rate of mass production. A patent application with publication number CN220498192U discloses a welding equipment for automotive door hinge reinforcement plates, including a frame, a positioning mechanism, and a robot base. The frame has two sets of symmetrical slide rails on its upper surface, with a moving stage longitudinally slidably connected between each set of two slide rails. The robot base is located directly behind the frame, and a welding robot is mounted on its upper surface, with welding clamps at the robot's execution end. The positioning mechanism is located on the upper surface of the moving stage. The equipment includes a welding intermediate frequency control cabinet and a robot control cabinet. This automotive door hinge reinforcement plate welding equipment can effectively position the automotive door hinge reinforcement plate before welding begins, preventing positional displacement during subsequent welding. Furthermore, the use of automated control technology and a dual-station welding process significantly improves the overall efficiency of automotive door hinge reinforcement plate welding.

[0003] While the aforementioned device can improve the welding efficiency of the reinforcing plate through positioning during use, when the reinforcing plate is welded onto the vehicle body, multiple cylinders are generally used to clamp and limit the vehicle body frame. However, existing cylinders typically clamp at multiple points, both above and below. This clamping method can lead to insecure clamping at other points due to thickness errors in the vehicle body. Consequently, during subsequent welding of the reinforcing plate, the vehicle body is prone to stress deformation due to insufficient clamping strength. Summary of the Invention

[0004] This invention provides an auxiliary device for welding reinforcing plates for automotive door hinges, solving the problem in related technologies where, when reinforcing plates are welded to the vehicle body, multiple cylinders are typically used to clamp and limit the vehicle frame. However, existing cylinders generally clamp at multiple points, both vertically and horizontally. This clamping method can lead to insecure clamping at other points due to thickness variations in the vehicle body. Consequently, during subsequent welding of the reinforcing plate, the vehicle body is prone to stress deformation due to insufficient clamping strength.

[0005] This invention provides a welding auxiliary device for automotive door hinge reinforcement plates, including a clamp base. A welding robotic arm is provided on the side of the clamp base, and a brazing head is provided at the end of the welding robotic arm. Multiple clamping compensation devices are provided on the top of the clamp base. A vehicle body is placed on the clamping compensation devices, and the clamping compensation devices compensate for multi-point clamping of the vehicle body. The clamping compensation devices include clamp support columns, locking components, following components, upper clamp support blocks, adjusting components, first clamping columns, second clamping columns, compensation components, and lower clamp support blocks. Multiple clamp support columns are fixedly installed on the clamp base, and the top of each clamp support column is provided with... The clamp is equipped with a locking component. A lower clamp support block is fixedly installed at the lower part of the clamp support column, and an upper clamp support block is rotatably installed at the upper part of the clamp support column. A follower component is provided at the top of the clamp support column near the upper clamp support block. A first clamping column and a second clamping column are fixedly installed at the bottom of the upper clamp support block. The first clamping column and the second clamping column, together with the lower clamp support block, clamp the vehicle body at multiple points. An adjusting component is provided inside the upper clamp support block. The locking component presses the follower component to limit the upper clamp support block. The follower component presses the adjusting component, which in turn drives the compensating component to adjust the clamping force of the second clamping column.

[0006] As a further optimization of the present invention, the locking member includes a locking post fixedly installed on the top of the clamp support post, a cam block is provided on the outside of the locking post, and an adjusting nut is fixedly installed on the top of the cam block.

[0007] As a further optimization of the present invention, the following component includes a limiting following plate symmetrically arranged on the top of the clamp support column and fixedly installed. A first following plate is slidably installed inside the limiting following plate. A pressing rod is slidably installed inside the first following plate. A pressing block is fixedly installed on the side of the pressing rod. A first sliding rod is fixedly installed on the side of the pressing block. A first spring is provided outside the first sliding rod. The first sliding rod passes through the interior of the first following plate.

[0008] As a further optimization of the present invention, the adjusting member includes a first fixed column fixedly installed inside the support block on the clamp, an adjusting rod rotatably installed on the outside of the first fixed column, an adjusting protrusion provided inside the adjusting rod, the adjusting protrusion being connected to the compensation member, a first sliding column slidably installed at the bottom of the adjusting rod, a second spring provided outside the first sliding column, a U-shaped block fixedly installed at the end of the first sliding column, and a roller rotatably installed inside the U-shaped block.

[0009] As a further optimization of the present invention, the compensation component includes a rack slidably mounted on the top of the support block on the clamp, a second nut slidably mounted inside the support block on the clamp located at the top of the second clamping column, a first gear rotatably mounted on the top of the support block on the clamp, the first gear being threadedly connected to the second nut, and the rack meshing with the first gear.

[0010] As a further optimization of the present invention, the compensation component includes a second slide post slidably mounted inside the rack, and a third spring is disposed outside the second slide post.

[0011] As a further optimization of the present invention, the limiting follower plate is provided with a spring inside and connected to the first follower plate, and the first follower plate has a tendency to move closer to the cam block when it is not under force.

[0012] As a further optimization of the present invention, when the first clamping post and the second clamping post are close to the lower support block of the clamp, the height of the first following plate is higher than the height of the side groove of the upper support block of the clamp.

[0013] As a further optimization of the present invention, a torsion spring is provided at the connection position between the first fixed column and the adjusting rod.

[0014] As a further optimization of the present invention, the top of the support block on the fixture is provided with a protrusion to limit the position of the rack.

[0015] The beneficial effects of this invention are as follows: The present invention discloses an auxiliary welding device for automotive door hinge reinforcement plates. This device uses a locking component inside a clamping compensation device to rotate and press a following component, thereby locking the support block on the clamp and preventing springback caused by vibration and welding stress during welding. The following component then presses and adjusts the adjusting component, causing the compensation component to rotate and adjusting the extension length of the second clamping column. When the thickness of the vehicle body is uneven, the rotation of the compensation component adjusts the clamping force between the compensation component and the lower support block of the clamp, achieving a compensation effect for multi-point clamping and improving the stability of the reinforcement plate welding. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall shape of the device of the present invention; Figure 2 This is a schematic diagram of the overall device installation of the present invention; Figure 3 This is a schematic diagram of the internal structure of the clamping compensation device of the present invention; Figure 4 This is a schematic diagram of part of the connection structure of the clamping compensation device of the present invention; Figure 5 This is a schematic diagram of the internal structure of the compensation component of the present invention; Figure 6 This is a schematic diagram of the internal structure of the adjusting component of the present invention.

[0017] In the picture: 1. Fixture base; 11. Welding robotic arm; 12. Brazing head; 13. Vehicle body; 2. Clamping compensation device; 21. Clamping support column; 22. Locking component; 221. Cam block; 222. Locking column; 223. Adjusting nut; 23. Following component; 231. Limiting following plate; 232. First following plate; 233. Pressing block; 234. First slide rod; 235. First spring; 236. Pressing rod; 24. Upper support block of clamp; 25. Adjusting component; 251. First fixed column; 252. Adjusting rod; 253. Adjusting protrusion; 254. First slide column; 255. Second spring; 256. U-shaped block; 257. Roller; 26. First clamping column; 27. Second clamping column; 28. Compensating component; 281. Second nut; 282. First gear; 283. Rack; 284. Second slide column; 285. Third spring; 29. ​​Lower support block of clamp. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] like Figures 1 to 3 As shown in the embodiment of the present invention, a welding auxiliary device for a car door hinge reinforcement plate includes a clamp base 1, a welding robotic arm 11 is provided on the side of the clamp base 1, a brazing head 12 is provided at the end of the welding robotic arm 11, and a plurality of clamping compensation devices 2 are provided on the top of the clamp base 1. A car body 13 is placed on the clamping compensation device 2, and the clamping compensation device 2 compensates when clamping the car body 13 at multiple points. like Figures 4 to 6 As shown, the clamping compensation device 2 includes a clamping support column 21, a locking element 22, a following element 23, an upper clamping support block 24, an adjusting element 25, a first clamping column 26, a second clamping column 27, a compensation element 28, and a lower clamping support block 29. Multiple clamping support columns 21 are fixedly installed on the clamping base 1. A locking element 22 is provided at the top of each clamping support column 21. A lower clamping support block 29 is fixedly installed at the bottom of each clamping support column 21. An upper clamping support block 24 is rotatably installed on the upper part of each clamping support column 21. The clamping compensation device 29 is located near the upper clamping support block 24. The top of the clamp support column 21 is provided with a follower 23, and the bottom of the upper support block 24 of the clamp is fixedly installed with a first clamping column 26 and a second clamping column 27. The first clamping column 26 and the second clamping column 27, together with the lower support block 29 of the clamp, clamp the vehicle body 13 at multiple points. The upper support block 24 of the clamp is provided with an adjusting member 25. The locking member 22 squeezes the follower 23 to limit the upper support block 24 of the clamp. The follower 23 squeezes the adjusting member 25 to drive the compensation member 28 to adjust the clamping force of the second clamping column 27.

[0020] It should be noted that when the multi-point clamping fixture clamps the vehicle body 13, it will be affected by the thickness error of the vehicle body 13. Therefore, during the subsequent clamping and welding process, the clamping force of other clamping points will be insufficient due to the thickness of the vehicle body 13. When the reinforcing plate is welded to the vehicle body 13, the resulting welding stress will lead to welding deformation and welding failure. Therefore, a clamping compensation device 2 is provided. By activating the motor or cylinder inside the clamping support column 21, the upper support block 24 of the clamping fixture is rotated, thereby causing the first clamping column 26 and the second clamping column 27 on the upper support block 24 of the clamping fixture to rotate towards the lower support block 29 of the clamping fixture, and the vehicle body 13 is placed on the lower support block 29 of the clamping fixture. When the first clamping post 26 and the second clamping post 27 move towards the lower support block 29 of the clamp, the vehicle body 13 can be clamped. If the thickness of the vehicle body 13 is uneven, and the clamping force of the first clamping post 26 and the lower support block 29 is sufficient, but the clamping force of the second clamping post 27 and the lower support block 29 is insufficient, the locking member 22 can be turned with a wrench, thereby driving the locking member 22 to rotate, so that the locking member 22 squeezes the following member 23, thereby locking the position of the upper support block 24 of the clamp. The travel distance of the following member 23 is less than a preset value. This preset value refers to the uniform clamping force of the first clamping post 26 and the compensating member 28 on the lower support block 29 of the clamp. The forces are the same. However, if the thickness of the vehicle body 13 at the clamping position of the first clamping post 26 is greater, resulting in insufficient clamping force of the second clamping post 27, then the travel of the following member 23 will be insufficient. This will cause the following member 23 to press against the adjusting member 25, causing the adjusting member 25 to rotate the compensating member 28. The rotation of the compensating member 28 adjusts the lifting height of the second clamping post 27, thereby adjusting the clamping force of the second clamping post 27 and the lower support block 29 of the clamp on the vehicle body 13, thus achieving the purpose of compensation and locking. The locking member 22 rotates to the closest end to the upper support block 24 of the clamp, which is the locking point. Therefore, there are parallel forces between the locking member 22 and the following member 23. During the welding process, the locking member 22 will not rotate automatically due to force. This device locks the support block 24 on the fixture by rotating and pressing the following member 23 inside the clamping compensation device 2, preventing the support block 24 on the fixture from rebounding due to vibration and welding stress during the welding process. Then, the following member 23 presses the adjusting member 25 to drive the compensation member 28 to rotate, thereby adjusting the extension length of the second clamping column 27. When the thickness of the vehicle body 13 is uneven, the clamping force of the compensation member 28 and the lower support block 29 of the fixture on the vehicle body 13 is adjusted by rotating the compensation member 28, achieving the compensation effect when clamping at multiple points and improving the stability of the reinforcing plate welding.

[0021] like Figures 4 to 6As shown, the locking member 22 includes a locking post 222 fixedly installed on the top of the clamp support post 21. A cam block 221 is provided on the outside of the locking post 222, and an adjusting nut 223 is fixedly installed on the top of the cam block 221.

[0022] It should be noted that by contacting the adjusting nut 223 with a wrench and then rotating the adjusting nut 223, the cam block 221 can be rotated around the locking post 222, thereby achieving the squeezing effect on the follower 23. When the cam block 221 rotates to the point closest to the lower support block 29 of the fixture, it reaches the self-locking point of the cam block 221, thereby limiting the position of the support block 24 on the fixture.

[0023] like Figures 3 to 6 As shown, the following component 23 includes a limiting following plate 231 symmetrically arranged on the top of the clamp support column 21 and fixedly installed. A first following plate 232 is slidably installed inside the limiting following plate 231. A pressing rod 236 is slidably installed inside the first following plate 232. A pressing block 233 is fixedly installed on the side of the pressing rod 236. A first sliding rod 234 is fixedly installed on the side of the pressing block 233. A first spring 235 is provided on the outside of the first sliding rod 234. The first sliding rod 234 passes through the interior of the first following plate 232.

[0024] It should be noted that the cam block 221 first pushes up the extrusion rod 236, and the end of the extrusion rod 236 is equipped with an extrusion block 233. The extrusion block 233 is provided with a first slide rod 234 and a first spring 235 on its upper part. Therefore, it first drives the first following plate 232 to extrude the support block 24 on the clamp, thereby locking the support block 24 on the clamp. If the thickness of the vehicle body 13 is relatively thick, the extrusion rod 236 extrudes the extrusion block 233, thereby driving the extrusion block 233 to move forward continuously, thereby extruding the adjusting member 25. The position of the compensation member 28 is adjusted by the adjusting member 25, thereby adjusting the clamping force of the second clamping column 27, thereby achieving the effect of clamping compensation when clamping at multiple points.

[0025] like Figures 4 to 6 As shown, the adjusting member 25 includes a first fixed post 251 fixedly installed inside the support block 24 on the clamp. An adjusting rod 252 is rotatably installed on the outside of the first fixed post 251. An adjusting protrusion 253 is provided inside the adjusting rod 252. The adjusting protrusion 253 is connected to the compensation member 28. A first sliding column 254 is slidably installed at the bottom of the adjusting rod 252. A second spring 255 is provided on the outside of the first sliding column 254. A U-shaped block 256 is fixedly installed at the end of the first sliding column 254. A roller 257 is rotatably installed inside the U-shaped block 256.

[0026] It should be noted that the rotation of the first fixed column 251 causes the adjusting protrusion 253 to slide on the top of the support block 24 on the fixture. The adjusting protrusion 253 is connected to the compensation component 28, and the bottom of the adjusting rod 252 is provided with a first sliding column 254 and a roller 257. Therefore, when the pressing block 233 presses the roller 257, it can drive the adjusting rod 252 to rotate, thereby driving the adjusting protrusion 253 to slide, and thus achieving the function of adjusting the clamping force of the second clamping column 27.

[0027] like Figures 4 to 6 As shown, the compensation component 28 includes a rack 283 slidably mounted on the top of the support block 24 of the clamp, a second nut 281 slidably mounted inside the support block 24 of the clamp located on the top of the second clamping post 27, a first gear 282 rotatably mounted on the top of the support block 24 of the clamp, the first gear 282 being threadedly connected to the second nut 281, and the rack 283 meshing with the first gear 282.

[0028] It should be noted that the end of the adjusting protrusion 253 is fixedly installed on the side of the rack 283. Therefore, when the adjusting rod 252 rotates, it can drive the rack 283 to slide on the top of the support block 24 of the clamp. The rack 283 meshes with the first gear 282, thereby driving the first gear 282 to rotate. The first gear 282 meshes with the second nut 281, thereby driving the second nut 281 to rotate. This causes the second clamping column 27 to descend, thus adjusting the height of the second clamping column 27 and adjusting the clamping force of the second clamping column 27 and the lower support block 29 of the clamp on the vehicle body 13.

[0029] like Figures 4 to 6 As shown, the compensation component 28 includes a second slide post 284 slidably mounted inside the rack 283, and a third spring 285 is provided on the outside of the second slide post 284.

[0030] It should be noted that the compensation component 28 includes a second sliding post 284 slidably mounted inside the rack 283, and a third spring 285 is disposed outside the second sliding post 284. The second sliding post 284 and the third spring 285 keep the rack 283 in a certain position. Figure 5 When the rack 283 is not under force, the bottom height of the second clamping post 27 is the same as that of the first clamping post 26, thereby maintaining the same clamping force.

[0031] like Figures 4 to 6 As shown, the limiting follower plate 231 is internally provided with a spring connected to the first follower plate 232. When the first follower plate 232 is not under force, it tends to move towards the cam block 221.

[0032] It should be noted that the limiting follower plate 231 is internally provided with a spring connected to the first follower plate 232. When the first follower plate 232 is not under force, it tends to move towards the cam block 221. This is to prevent the first follower plate 232 from limiting the support block 24 on the fixture when the pressing rod 236 is not pressed by the cam block 221, and to prevent the pressing block 233 from pressing the adjusting member 25. This is to prevent the follower member 23 from affecting the adjusting member 25 and the support block 24 on the fixture in the normal state.

[0033] like Figures 4 to 6 As shown, when the first clamping post 26 and the second clamping post 27 are close to the lower support block 29 of the clamp, the height of the first following plate 232 is higher than the height of the side groove of the upper support block 24 of the clamp.

[0034] It should be noted that when the first clamping post 26 and the second clamping post 27 are close to the lower support block 29 of the clamp, the height of the first following plate 232 is higher than the height of the side groove of the upper support block 24 of the clamp. Only after the first clamping post 26 and the lower support block 29 of the clamp, as well as the second clamping post 27 and the lower support block 29 of the clamp, clamp the vehicle body 13, and then the rotating cam block 221 presses against the following member 23, so that the following member 23 can limit the upper support block 24 of the clamp.

[0035] like Figures 4 to 6 As shown, a torsion spring is provided at the connection position between the first fixed column 251 and the adjusting rod 252.

[0036] It should be noted that a torsion spring is provided at the connection position between the first fixed post 251 and the adjusting rod 252, so that under normal conditions, the bottom of the second clamping post 27 and the bottom of the first clamping post 26 are at the same level.

[0037] like Figures 4 to 6 As shown, the top of the support block 24 on the fixture is provided with a protrusion to limit the position of the rack 283.

[0038] It should be noted that the top of the support block 24 on the fixture is provided with a protrusion to limit the position of the rack 283, preventing the adjusting rod 252 from driving the rack 283 to move away from the locking member 22 under the action of the first fixed column 251.

[0039] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the embodiments described above, all of which are within the protection scope of the present invention.

Claims

1. A welding auxiliary device for reinforcing plates of automobile door hinges, comprising a clamp base (1), characterized in that: The side of the clamp base (1) is provided with a welding robot arm (11), the end of the welding robot arm (11) is provided with a brazing head (12), the top of the clamp base (1) is provided with multiple clamping compensation devices (2), the clamping compensation device (2) is placed on the vehicle body (13), and the clamping compensation device (2) compensates when clamping the vehicle body (13) at multiple points; The clamping compensation device (2) includes a clamping support column (21), a locking element (22), a following element (23), an upper clamping support block (24), an adjusting element (25), a first clamping column (26), a second clamping column (27), a compensation element (28), and a lower clamping support block (29). Multiple clamping support columns (21) are fixedly installed on the clamping base (1). A locking element (22) is provided at the top of each clamping support column (21). A lower clamping support block (29) is fixedly installed at the bottom of each clamping support column (21). An upper clamping support block (24) is rotatably installed on the upper part of each clamping support column (21). The clamping compensation device (2) includes a clamping support column (21), a locking element (22), a following element (23), an upper clamping support block (24), and an adjusting element (25) near the upper clamping support block (24). A follower (23) is provided on the top of the clamp support column (21). A first clamping column (26) and a second clamping column (27) are fixedly installed on the bottom of the upper support block (24) of the clamp. The first clamping column (26) and the second clamping column (27) together with the lower support block (29) of the clamp clamp the vehicle body (13) at multiple points. An adjusting member (25) is provided inside the upper support block (24) of the clamp. The locking member (22) squeezes the follower (23) to limit the upper support block (24) of the clamp. The follower (23) squeezes the adjusting member (25) to drive the compensation member (28) to adjust the clamping force of the second clamping column (27).

2. The auxiliary device for welding a reinforcing plate of an automobile door hinge according to claim 1, characterized in that: The locking component (22) includes a locking post (222) fixedly installed on the top of the clamp support post (21), and a cam block (221) is provided on the outside of the locking post (222). An adjusting nut (223) is fixedly installed on the top of the cam block (221).

3. The auxiliary device for welding a reinforcing plate of an automobile door hinge according to claim 2, characterized in that: The following component (23) includes a limiting following plate (231) fixedly installed on the top of the clamp support column (21) and symmetrically arranged. A first following plate (232) is slidably installed inside the limiting following plate (231). A pressing rod (236) is slidably installed inside the first following plate (232). A pressing block (233) is fixedly installed on the side of the pressing rod (236). A first sliding rod (234) is fixedly installed on the side of the pressing block (233). A first spring (235) is provided on the outside of the first sliding rod (234). The first sliding rod (234) passes through the interior of the first following plate (232).

4. The auxiliary device for welding a reinforcing plate of an automobile door hinge according to claim 3, characterized in that: The adjusting component (25) includes a first fixed column (251) fixedly installed inside the support block (24) on the clamp. An adjusting rod (252) is rotatably installed on the outside of the first fixed column (251). An adjusting protrusion (253) is provided inside the adjusting rod (252). The adjusting protrusion (253) is connected to the compensation component (28). A first sliding column (254) is slidably installed at the bottom of the adjusting rod (252). A second spring (255) is provided on the outside of the first sliding column (254). A U-shaped block (256) is fixedly installed at the end of the first sliding column (254). A roller (257) is rotatably installed inside the U-shaped block (256).

5. The auxiliary device for welding a reinforcing plate of an automobile door hinge according to claim 4, characterized in that: The compensation component (28) includes a rack (283) slidably mounted on the top of the support block (24) of the clamp, a second nut (281) slidably mounted inside the support block (24) of the clamp located on the top of the second clamping post (27), a first gear (282) rotatably mounted on the top of the support block (24) of the clamp, the first gear (282) being threadedly connected to the second nut (281), and the rack (283) meshing with the first gear (282).

6. The auxiliary device for welding a reinforcing plate of an automobile door hinge according to claim 5, characterized in that: The compensation component (28) includes a second slide post (284) slidably mounted inside the rack (283), and a third spring (285) is provided on the outside of the second slide post (284).

7. The auxiliary device for welding a reinforcing plate of an automobile door hinge according to claim 6, characterized in that: The limiting follower plate (231) is internally provided with a spring connected to the first follower plate (232), and the first follower plate (232) has a tendency to move closer to the cam block (221) when it is not under force.

8. The auxiliary device for welding a reinforcing plate of an automobile door hinge according to claim 7, characterized in that: When the first clamping post (26) and the second clamping post (27) are close to the lower support block (29) of the clamp, the height of the first following plate (232) is higher than the height of the side groove of the upper support block (24) of the clamp.

9. The auxiliary device for welding a reinforcing plate of an automobile door hinge according to claim 8, characterized in that: A torsion spring is provided at the connection position between the first fixed column (251) and the adjusting rod (252).

10. The auxiliary device for welding a reinforcing plate of an automobile door hinge according to claim 9, characterized in that: The top of the support block (24) of the fixture is provided with a protrusion to limit the position of the rack (283).

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