Positioning tool for welding automobile bumper
Patent Information
- Application Number
- CN202522529194.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-11-28
AI Technical Summary
[0003]然而，现有用于汽车保险杠焊接的定位工装，大多针对特定外形设计，属于定制化专用装备，导致其结构往往较为庞大、整体重量偏高
[0017]本实用新型通过在支撑块两侧均设置承载板，支撑块和承载板之间设置若干个定位块，且安装台两侧对称设置定位杆，进而便于对汽车保险杠进行快速定位夹持，且通过设置调节机构，进而便于对定位块和承载板工作角度进行调节，且承载板底端设置第三调节杆和第二调节管、定位块底端设置第二调节杆和第一调节管，螺纹杆可带动安装台移动，进而便于对承载板、定位块和支撑块工作角度进行调节，使得可对汽车保险杠凸面和凹面进行定位夹持，从而增加了汽车保险杠焊接定位工装的实用性。
Smart Images
Figure CN224879779U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automobile manufacturing and processing technology, specifically a positioning fixture for welding automobile bumpers. Background Technology
[0002] In modern society, automobiles have become an indispensable means of transportation in daily life, with various models ubiquitous on the streets. To enhance vehicle safety and protective performance, bumpers are typically installed at the front and rear of cars to provide cushioning and protection in the event of a collision. Welding is a crucial process in the manufacturing of car bumpers, involving the precise connection and fixation of multiple parts. To ensure welding quality and precision, specialized fixtures are often used to stably position the bumper, facilitating subsequent welding operations. Currently, most common positioning methods are based on fixed structural designs, which, while meeting the needs of mass production to some extent, still have limitations in adaptability and flexibility when dealing with bumpers of different models or special structures.
[0003] However, existing positioning fixtures for automotive bumper welding are mostly designed for specific shapes and are customized special-purpose equipment, resulting in their often bulky structure and high overall weight. When facing small-batch, multi-variety bumper welding tasks, these fixtures lack versatility, making replacement and adjustment extremely inconvenient, severely impacting production rhythm and equipment utilization. Furthermore, bumper welding often requires separate operations on its concave and convex surfaces, while existing positioning fixtures typically only effectively fix a single curved surface shape, failing to meet the positioning requirements for double-sided welding simultaneously. Therefore, completing the entire bumper welding process often necessitates at least two different sets of positioning fixtures, increasing tooling development and storage costs, reducing processing efficiency, and significantly restricting production flexibility.
[0004] Based on this, a positioning fixture for welding automobile bumpers is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content
[0005] The purpose of this utility model is to provide a positioning fixture for welding automobile bumpers, so as to solve the problems in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] A positioning fixture for welding car bumpers includes a mounting platform and a support plate. A support block is mounted on the upper end of the mounting platform. A mounting tube is fixedly installed in a mounting groove on the upper end of the mounting platform. A clamping mechanism for positioning and holding the car bumper is provided inside the mounting tube. The bottom end of the mounting platform is fixedly connected to the output ends of two telescopic rods, both of which are fixedly mounted on the upper end of the mounting base plate. Support plates are provided on both sides of the mounting platform. A hinge block is fixedly installed at the bottom end of the support plate. A second hinge seat is hinged to the hinge block. The second hinge seat is fixedly mounted at one end of a third adjusting rod. A second adjusting tube is slidably mounted on the third adjusting rod. Several positioning blocks are provided between the support plate and the mounting platform. A second adjusting rod is mounted at the bottom end of each positioning block. A first adjusting tube is sleeved on the second adjusting rod. A first hinge seat is hinged to one end of both the first and second adjusting tubes. An adjustment mechanism for easy adjustment is provided on one side of both the first and second hinge seats.
[0008] Based on the above technical solutions, this utility model also provides the following optional technical solutions:
[0009] In one alternative: a threaded rod is fixedly provided at the bottom of the mounting platform, a threaded tube is threadedly fitted on the threaded rod, and support frames are rotatably provided at both ends of the threaded tube. The support frames are fixedly installed inside the fixed box, and the fixed box is fixedly installed on the upper end of the mounting base plate. A worm gear is fixedly provided on the threaded tube, and a worm is meshed on the worm gear. Both ends of the worm are rotatably installed in the rotating holes inside the fixed box.
[0010] In one alternative embodiment: Each of the upper ends of the support plate is fitted with an adjusting plate; each of the two ends of the adjusting plate has a rotating block rotatably mounted on a rotating shaft; the rotating blocks are fixedly mounted on the upper end of the support plate; a first extension shaft is fixedly mounted on one end of the adjusting plate; a stop post is fixedly mounted on the first extension shaft; a connecting box is rotatably mounted on the extension shaft; the connecting box is fixedly mounted on the upper end of the support plate; the stop post has several first stop grooves; a third stop block is closely attached to the stop post; several first stop strips are provided at the bottom end of the third stop block; a first screw is rotatably mounted at the upper end of the third stop block; and a threaded hole is provided on the connecting box at the position corresponding to the first screw.
[0011] In one alternative embodiment: the clamping mechanism includes positioning rods, two of which are symmetrically arranged. Each positioning rod has a fixed sliding tube at one end, and a first adjusting rod is slidably mounted in the middle of each sliding tube. Each first adjusting rod has a fixed sliding block at one end, and the sliding blocks are slidably mounted inside the mounting tube. Each sliding block has a threaded hole in its middle, and is mounted on a bidirectional screw through the threaded hole. The bidirectional screw is rotatably mounted inside the mounting tube. A plurality of second stop grooves are arrayed on one side of the first adjusting rod. A first stop block is slidably mounted in one of the sliding grooves on one side of the sliding tube. A plurality of second stop strips are arrayed on one side of the first stop block. A second screw is rotatably mounted on one side of the first stop block, and a threaded hole is provided on one side of the mounting groove corresponding to the position of the second screw.
[0012] In one alternative: a connecting pipe is provided at one end of both the first adjusting pipe and the second adjusting pipe, a second stop block is slidably provided inside the connecting pipe, a third screw is rotatably provided on one side of the second stop block, a threaded hole is provided at the end of the connecting pipe corresponding to the position of the third screw, a plurality of third stop grooves are arrayed on one side of both the second adjusting rod and the third adjusting rod, and a plurality of third stop strips are arrayed on one side of the second stop block.
[0013] In one alternative embodiment: the adjusting mechanism includes a fixed tube, and each of the bottom ends of the first hinge seats is fixedly provided with a mounting seat. The mounting seat is fixedly connected to the mounting base plate by screws. A fixed tube is fixedly provided on one side of both the first and second hinge seats. A limiting ring is fixedly provided inside the fixed tube. A fixed shaft is fitted inside the fixed tube. The fixed shaft is fixedly provided on one side of the hinge block, the first adjusting tube, and the second adjusting tube. An external spline shaft is fixedly provided at one end of the fixed shaft. An internal spline shaft is fitted on the external spline shaft. A fixed disc is fixedly provided at one end of the internal spline shaft. Limiting rods are symmetrically provided on the internal spline shaft. The limiting rods are slidably provided in the limiting groove on one side of the limiting ring. A second return spring is provided between one end of the internal spline shaft and one end of the fixed shaft.
[0014] In one alternative: the upper end of the mounting base plate is provided with a plurality of adjustment holes arranged in an equally spaced array.
[0015] In one alternative: a baffle is fixedly provided inside the mounting tube, and an arc-shaped groove is provided on one side of the sliding block at a position corresponding to the baffle.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0017] This utility model facilitates the rapid positioning and clamping of car bumpers by setting bearing plates on both sides of the support block, setting several positioning blocks between the support block and the bearing plates, and symmetrically setting positioning rods on both sides of the mounting platform. Furthermore, by setting an adjustment mechanism, it is easy to adjust the working angle of the positioning blocks and the bearing plates. The bottom end of the bearing plate is set with a third adjustment rod and a second adjustment tube, and the bottom end of the positioning block is set with a second adjustment rod and a first adjustment tube. The threaded rod can drive the mounting platform to move, thereby facilitating the adjustment of the working angle of the bearing plate, positioning blocks, and support blocks. This allows for the positioning and clamping of the convex and concave surfaces of the car bumper, thus increasing the practicality of the car bumper welding positioning fixture. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of this utility model.
[0019] Figure 2 This is a schematic diagram of the internal structure of the fixing box of this utility model.
[0020] Figure 3 This is a schematic diagram of the baffle installation of this utility model.
[0021] Figure 4 This is a schematic diagram of the internal structure of the installation pipe of this utility model.
[0022] Figure 5 This is a schematic diagram of the structure of the second adjusting rod and the second stop block of this utility model.
[0023] Figure 6 This is a schematic diagram of the internal structure of the fixed tube of this utility model.
[0024] Figure 7 This is a schematic diagram of the installation of the stop post and the third stop block of this utility model.
[0025] Figure reference numerals: 11 Support block, 12 Mounting platform, 13 Telescopic rod, 14 Mounting tube, 15 Bidirectional screw, 16 First adjusting rod, 17 First stop block, 18 Sliding tube, 19 Positioning rod, 20 Threaded rod, 21 Threaded tube, 22 Worm gear, 23 Worm, 24 Fixing box, 25 Positioning block, 26 Second adjusting rod, 27 First adjusting tube, 28 Second stop block, 29 First hinge seat, 30 Mounting seat, 31 Mounting base plate, 32 Adjusting hole, 33 Bearing plate, 34 Adjusting plate, 35 Stop post, 36 Third stop block, 37 Third adjusting rod, 38 Second adjusting tube, 39 Internal spline shaft, 40 Fixing disc, 41 Fixing tube, 42 Limiting ring, 43 Limiting rod, 44 Second return spring, 45 Baffle. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.
[0027] In one embodiment, such as Figures 1-7 As shown, a positioning fixture for welding car bumpers includes a mounting platform 12 and a support plate 33. A support block 11 is mounted on the upper end of the mounting platform 12. A mounting tube 14 is fixedly installed in the mounting groove at the upper end of the mounting platform 12. The mounting tube 14 has a clamping mechanism inside for positioning and clamping the car bumper. The bottom end of the mounting platform 12 is fixedly connected to the output ends of two telescopic rods 13, which are both fixedly mounted on the upper end of the mounting base plate 31. Support plates 33 are provided on both sides of the mounting platform 12. A hinge block is fixedly installed at the bottom end of the support plate 33. A second hinge seat is hinged to the hinge block, and the second hinge seat is fixedly mounted on... At one end of the third adjusting rod 37, a second adjusting tube 38 is slidably provided on the third adjusting rod 37. Several positioning blocks 25 are provided between the bearing plate 33 and the mounting platform 12. A second adjusting rod 26 is installed at the bottom of the positioning block 25. A first adjusting tube 27 is sleeved on the second adjusting rod 26. A first hinge seat 29 is hinged to one end of the first adjusting tube 27 and the second adjusting tube 38. An adjusting mechanism is provided on one side of the first hinge seat 29 and the second hinge seat to facilitate adjustment. The clamping mechanism facilitates clamping and fixing of the car bumper, and the adjusting mechanism facilitates adjustment of the working position of the positioning block 25 and the bearing plate 33.
[0028] The mounting platform 12 is fixedly provided with a threaded rod 20 at its bottom end. A threaded tube 21 is threadedly fitted onto the threaded rod 20. Support frames are rotatably provided at both ends of the threaded tube 21. The support frames are fixedly installed inside the fixed box 24. The fixed box 24 is fixedly installed on the upper end of the mounting base plate 31. A worm gear 22 is fixedly provided on the threaded tube 21. A worm 23 is meshed on the worm gear 22. Both ends of the worm 23 are rotatably installed in the rotating holes inside the fixed box 24. In use, when it is necessary to adjust the working height of the mounting platform 12, the worm 23 is rotated. The worm 23 meshes with the worm gear 22, causing the threaded tube 21 to rotate. Under the action of the thread, the threaded rod 20 drives the mounting platform 12 to move.
[0029] Each of the support plates 33 is fitted with an adjusting plate 34 at its upper end. Rotating blocks are rotatably mounted on rotating shafts at both ends of the adjusting plate 34, and these rotating blocks are fixedly mounted on the upper end of the support plate 33. A first extension shaft is fixedly mounted on one end of the adjusting plate 34, and a stop post 35 is fixedly mounted on the first extension shaft. A connecting box is rotatably mounted on the extension shaft, and the connecting box is fixedly mounted on the upper end of the support plate 33. The stop post 35 has several first stop grooves, and a third stop block 36 is tightly attached to the stop post 35. The bottom of the 6 is provided with several first stop strips. The upper end of the third stop block 36 is provided with a first screw. The connecting box is provided with a threaded hole at the position of the first screw. When it is needed to position the car bumper, the tilt angle of the adjusting plate 34 is adjusted, and then the first screw is rotated. The first screw drives the third stop block 36 to move. The third stop block 36 is in close contact with the outer side of the stop post 35. The first stop strip is inserted into the first stop groove, thereby fixing the adjusting plate 34. Then the two adjusting plates 34 can position the two ends of the car bumper.
[0030] The clamping mechanism includes positioning rods 19, two of which are symmetrically arranged. Each positioning rod 19 has a fixed sliding tube 18 at one end. Each sliding tube 18 has a first adjusting rod 16 slidably mounted in its middle. Each first adjusting rod 16 has a fixed sliding block at one end. The sliding blocks are slidably mounted inside the mounting tube 14, and each sliding block has a threaded hole in its middle. The sliding blocks are mounted on a bidirectional screw 15 through the threaded holes. The bidirectional screw 15 is rotatably mounted inside the mounting tube 14. A plurality of second stop grooves are arrayed on one side of the first adjusting rod 16. A first stop block 17 is slidably mounted in one of the sliding grooves on one side of the sliding tube 18. A plurality of second stop grooves are arrayed on one side of the first stop block 17. The first stop block 17 has a second screw rotatably mounted on one side, and a threaded hole is provided on one side of the mounting groove corresponding to the position of the second screw. In use, when it is necessary to position and fix the car bumper, the sliding tube 18 slides on the first adjusting rod 16 according to the height of the middle part of the car bumper, so that the bottom end of the positioning rod 19 is in close contact with the upper end of the car bumper. Then, the second screw is rotated, and the second stop strip is inserted into the second stop groove, thereby fixing the positioning rod 19. Then, the bidirectional screw 15 is rotated, and under the action of the thread, the two sliding blocks move simultaneously and in opposite directions. When the bottom end of the positioning rod 19 is in close contact with the upper end of the car bumper, the car bumper is positioned and clamped.
[0031] Each of the first adjusting tube 27 and the second adjusting tube 38 has a connecting tube at one end. A second stop block 28 is slidably provided inside the connecting tube. A third screw is rotatably provided on one side of the second stop block 28. A threaded hole is provided at the end of the connecting tube corresponding to the position of the third screw. A plurality of third stop grooves are arrayed on one side of the second adjusting rod 26 and the third adjusting rod 37. A plurality of third stop strips are arrayed on one side of the second stop block 28. When it is necessary to adjust the working height of the positioning block 25 and the bearing plate 33, the second adjusting rod 26 slides inside the first adjusting tube 27 and the third adjusting rod 37 slides inside the second adjusting tube 38. Then, the third screw is rotated so that the third stop strip is inserted into the third stop groove, thereby fixing the second adjusting rod 26 and the third adjusting rod 37.
[0032] The adjusting mechanism includes a fixed tube 41. A mounting base 30 is fixedly provided at the bottom end of each of the first hinge seats 29. The mounting base 30 is fixedly connected to the mounting base plate 31 by screws. A fixed tube 41 is fixedly provided on one side of each of the first and second hinge seats. A limiting ring 42 is fixedly provided inside the fixed tube 41. A fixed shaft is fitted inside the fixed tube 41. The fixed shaft is fixedly provided on one side of the hinge block, the first adjusting tube 27, and the second adjusting tube 38. An external spline shaft is fixedly provided at one end of the fixed shaft. An internal spline shaft 39 is fitted on the external spline shaft. A fixed disc 40 is fixedly provided at one end of the internal spline shaft 39. Limiting rods 43 are symmetrically provided on the internal spline shaft 39. The limiting rod 43 is slidably disposed in the limiting groove on one side of the limiting ring 42. A second return spring 44 is provided between one end of the inner spline shaft 39 and one end of the fixed shaft. In use, when it is necessary to adjust the working angle of the positioning block 25, the second adjusting tube 38 and the bearing plate 33, the fixed plate 40 is pushed. The fixed plate 40 drives the inner spline shaft 39 to slide, and the inner spline shaft 39 drives the limiting rod 43 to slide, so that one end of the limiting rod 43 is disengaged from the limiting groove, so that the corresponding positioning block 25, the second adjusting tube 38 and the bearing plate 33 can be rotated. After the adjustment is completed, the fixed plate 40 is released. Under the action of the second return spring 44, the limiting rod 43 is inserted into the limiting groove, and then the fixing is completed again.
[0033] The mounting base plate 31 has several adjustment holes 32 arranged at equal intervals on its upper end. In use, it is convenient to increase the number of positioning blocks 25 according to the shape of the car bumper. At the same time, the installation position of the mounting seat 30 corresponding to the bearing plate 33 can be adjusted according to the length of the car bumper.
[0034] A baffle 45 is fixedly installed inside the mounting tube 14. An arc-shaped groove is provided on one side of the sliding block at the position corresponding to the baffle 45, which facilitates the protection of the bidirectional screw 15 during use.
[0035] The above embodiment discloses a positioning fixture for welding car bumpers. When positioning the car bumper, the tilt angle of the adjusting plate 34 is adjusted, and then the first screw is rotated. The first screw drives the third stop block 36 to move, and the third stop block 36 is tightly against the outer side of the stop post 35. The first stop strip is inserted into the first stop groove, thereby fixing the adjusting plate 34. The two ends of the car bumper are placed on the two adjusting plates 34, and several positioning blocks 25 can position the car bumper. Simultaneously, the middle of the car bumper... The sliding tube 18 slides on the first adjusting rod 16 according to the height of the middle of the car bumper, so that the bottom end of the positioning rod 19 is in close contact with the upper end of the car bumper. Then, the second screw is rotated and the second stop strip is inserted into the second stop groove, thereby fixing the positioning rod 19. Then, the double screw 15 is rotated, and under the action of the thread, the two sliding blocks move simultaneously and in opposite directions. When the bottom end of the positioning rod 19 is in close contact with the upper end of the car bumper, the car bumper is positioned and clamped.
[0036] When positioning the convex surface of a car bumper is required, the support block 11 is replaced, the worm gear 23 is rotated, and the worm gear 23 meshes with the worm wheel 22, driving the threaded tube 21 to rotate. Under the action of the thread, the threaded rod 20 drives the mounting platform 12 to move. At the same time, the second adjusting rod 26 slides inside the first adjusting tube 27, thereby adjusting the working height of the positioning block 25. The third adjusting rod 37 slides inside the second adjusting tube 38, thereby adjusting the working height of the bearing plate 33. Subsequently, the fixed plate 40 is pushed, and the fixed plate 40 drives the internal spline shaft 39 to slide. The key shaft 39 drives the limiting rod 43 to slide, causing one end of the limiting rod 43 to disengage from the limiting groove, allowing the corresponding positioning block 25, the second adjusting tube 38, and the bearing plate 33 to rotate. After adjustment, the fixing plate 40 is released, and under the action of the second return spring 44, the limiting rod 43 is inserted into the limiting groove, thus completing the fixation again. At this time, the working height of the bearing plate 33 is higher than the working height of the support block 11, and the working height of several positioning blocks 25 between the bearing plate 33 and the support block 11 is set in a gradually decreasing state, thereby enabling the positioning of the convex surface of the car bumper.
[0037] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A positioning fixture for welding automobile bumpers, comprising a mounting platform (12) and a support plate (33), wherein a support block (11) is mounted on the upper end of the mounting platform (12), and a mounting tube (14) is fixedly disposed in the mounting groove at the upper end of the mounting platform (12), characterized in that, The mounting tube (14) is equipped with a clamping mechanism for positioning and clamping the car bumper. The bottom end of the mounting platform (12) is fixedly connected to the output ends of two telescopic rods (13). The telescopic rods (13) are all fixedly mounted on the upper end of the mounting base plate (31). The mounting platform (12) is equipped with a bearing plate (33) on both sides. The bottom end of the bearing plate (33) is fixedly equipped with a hinge block. A second hinge seat is hinged on the hinge block. The second hinge seat is fixedly mounted on one end of the third adjusting rod (37). A second adjusting tube (38) is slidably provided on the rod (37). Several positioning blocks (25) are provided between the bearing plate (33) and the mounting platform (12). A second adjusting rod (26) is installed at the bottom of the positioning block (25). A first adjusting tube (27) is sleeved on the second adjusting rod (26). A first hinge seat (29) is hinged at one end of the first adjusting tube (27) and the second adjusting tube (38). An adjusting mechanism is provided on one side of the first hinge seat (29) and the second hinge seat to facilitate adjustment.
2. The positioning fixture for welding automobile bumpers according to claim 1, characterized in that, The mounting platform (12) is fixedly provided with a threaded rod (20) at the bottom end. A threaded tube (21) is threadedly fitted on the threaded rod (20). Both ends of the threaded tube (21) are rotatably provided with support frames. The support frames are fixedly installed inside the fixed box (24). The fixed box (24) is fixedly installed on the upper end of the mounting base plate (31). A worm gear (22) is fixedly provided on the threaded tube (21). A worm (23) is meshed on the worm gear (22). Both ends of the worm (23) are rotatably installed in the rotating holes inside the fixed box (24).
3. The positioning fixture for welding an automobile bumper according to claim 2, characterized in that, The upper end of each of the bearing plates (33) is provided with an adjusting plate (34). Each of the two ends of the adjusting plate (34) is provided with a rotating block. The rotating blocks are fixedly provided on the upper end of the bearing plate (33). A first extension shaft is fixedly provided on one end of the adjusting plate (34). A stop post (35) is fixedly provided on the first extension shaft. A connecting box is rotatably provided on the extension shaft. The connecting box is fixedly provided on the upper end of the bearing plate (33). The stop post (35) is provided with several first stop grooves. A third stop block (36) is closely attached to the stop post (35). Several first stop strips are provided at the bottom end of the third stop block (36). A first screw is rotatably provided at the upper end of the third stop block (36). A threaded hole is provided on the connecting box at the position of the first screw.
4. The positioning fixture for welding an automobile bumper according to claim 1, characterized in that, The clamping mechanism includes positioning rods (19), two positioning rods (19) are symmetrically arranged, one end of each positioning rod (19) is fixedly provided with a sliding tube (18), the middle of each sliding tube (18) is slidably provided with a first adjusting rod (16), one end of each first adjusting rod (16) is fixedly provided with a sliding block, the sliding blocks are slidably provided inside the mounting tube (14), the middle of each sliding block is provided with a threaded hole, the sliding blocks are all set on a bidirectional screw (15) through the threaded hole, the bidirectional screw (15) is rotatably provided inside the mounting tube (14), one side of the first adjusting rod (16) is provided with a plurality of second stop grooves, one side of the sliding tube (18) is provided with a first stop block (17) slidably provided in the sliding groove, one side of the first stop block (17) is provided with a plurality of second stop strips, one side of the first stop block (17) is rotatably provided with a second screw, one side of the mounting groove is provided with a threaded hole corresponding to the position of the second screw.
5. A positioning fixture for welding automobile bumpers according to claim 1, characterized in that, The first adjusting tube (27) and the second adjusting tube (38) are each provided with a connecting tube at one end. The connecting tube is provided with a second stop block (28) that slides inside. The second stop block (28) is provided with a third screw on one side. The end of the connecting tube is provided with a threaded hole corresponding to the position of the third screw. The second adjusting rod (26) and the third adjusting rod (37) are provided with a plurality of third stop grooves on one side. The second stop block (28) is provided with a plurality of third stop strips on one side.
6. The positioning fixture for welding an automobile bumper according to claim 1, characterized in that, The adjustment mechanism includes a fixed tube (41). A mounting base (30) is fixedly provided at the bottom end of each of the first hinge seats (29). The mounting base (30) is fixedly connected to the mounting base plate (31) by screws. A fixed tube (41) is fixedly provided on one side of each of the first hinge seats (29) and the second hinge seat. A limiting ring (42) is fixedly provided inside the fixed tube (41). A fixed shaft is fitted inside the fixed tube (41). The fixed shaft is fixedly installed on the hinge block and the first adjustment... On one side of the tube (27) and the second adjusting tube (38), an external spline shaft is fixedly provided at one end of the fixed shaft, and an internal spline shaft (39) is fitted on the external spline shaft. A fixed plate (40) is fixedly provided at one end of the internal spline shaft (39), and a limiting rod (43) is symmetrically provided on the internal spline shaft (39). The limiting rod (43) is slidably provided in the limiting groove on one side of the limiting ring (42). A second return spring (44) is provided between one end of the internal spline shaft (39) and one end of the fixed shaft.
7. A positioning fixture for welding automobile bumpers according to claim 1, characterized in that, The mounting base plate (31) has several adjustment holes (32) arranged in an evenly spaced array on its upper end.
8. A positioning fixture for welding automobile bumpers according to claim 4, characterized in that, The mounting tube (14) is fixedly provided with a baffle (45), and an arc groove is provided on one side of the sliding block at the position corresponding to the baffle (45).