Welding fixture for front wheel cover

Abstract

The utility model relates to the technical field of front wheel cover clamping, in particular to a front wheel cover welding clamp which comprises a base, a module arranged on the top of the base, a telescopic cylinder vertically arranged on one side of the base, a hinge frame arranged on the telescopic cylinder, a pressing frame hinged to the hinge frame and a pressing shaft arranged on the pressing frame. One end of the pressing frame is hinged to the telescopic end of the telescopic cylinder, the pressing shaft is located above the module, the pressing shaft is sequentially sleeved with a fixing ring, a spring and a connecting ring in the direction close to the module, the top of the pressing shaft is fixedly sleeved with the fixing ring, the two ends of the spring are installed on the fixing ring and the connecting ring respectively, and the connecting ring is sleeved with a fixing sleeve; the bottom of the fixing sleeve is installed on the connecting ring, the spring, the fixing ring and the pressing shaft are all movably sleeved with the fixing sleeve, the bottom end of the fixing sleeve is not higher than the bottom end of the pressing shaft, and a sealing ring made of elastic materials is arranged at the bottom of the fixing sleeve. The utility model provides a welding clamp for a front wheel cover. Welding slag generated by welding is splashed to a pressing shaft of the clamp.

Description

Technical Field

[0001] The utility model relates to the technical field of front wheel cover clamping, in particular to a welding fixture for a front wheel cover. Background Art

[0002] The front wheel cover of an automobile is a front protection device of the automobile and is installed above the front wheels of a motor vehicle. The main functions of the front wheel cover are to prevent dust and stones picked up by the vehicle tires during rolling from damaging the vehicle body, reduce noise pollution, protect the vehicle body part, and thus extend the service life of the motor vehicle. At the same time, the front wheel cover also has a certain beautifying effect and can improve the visual effect of the vehicle. In addition, the front wheel cover can also prevent the position of the tie rod ball head from rusting and avoid mud and sand splashing onto the vehicle body surface and scratching the car paint. The front wheel cover of an automobile belongs to a typical saddle-shaped covering part. Compared with general stamping products, the front wheel cover has the characteristics of complex shape, large wheel size, thin material, and high surface quality requirements, so the manufacturing process of the front wheel cover plate needs to go through various processing procedures such as stamping, cutting, trimming, and welding to be completed. Among them, the welding process is an important link in the automobile manufacturing process. This process mainly involves connecting the various components of the front wheel cover together by welding to ensure the structural strength and stability of the front wheel cover.

[0003] A welding fixture is a commonly used tool in the welding process. The workpiece to be welded is clamped by the welding fixture to ensure the welding dimensions of the workpiece, improve the assembly accuracy and efficiency, and at the same time prevent deformation caused by welding. In the automobile manufacturing process, the welding fixture plays a crucial role. Especially in the welding process of key parts such as the front wheel cover of an automobile, the welding fixture ensures that the welded part maintains the correct position and posture during the welding process through precise positioning and clamping functions, thereby improving the welding quality and production efficiency. However, due to the complex shape of the front wheel cover, the welding path of the front wheel cover is relatively complex, and welding slag often splashes during the welding process. For the welding process of the front wheel cover, it is difficult to control the flying law of the welding slag. Therefore, after the welding fixture is used for a long time, a large amount of welding slag often accumulates on the surface of the welding fixture, which affects the service life of the welding fixture. In addition, if these splashed welding slags fall on the clamping area of the welding fixture, it may affect the accuracy of the welding fixture for clamping the front wheel cover, unable to ensure that the front wheel cover maintains the correct position and posture during the welding process, and may even scratch the front wheel cover, thus affecting the manufacturing quality of the front wheel cover. Therefore, there is room for improvement in the splash prevention of the welding fixture to reduce or avoid the influence of the splashed welding slag on the use of the welding fixture, and further improve the stability of the use of the welding fixture to improve the welding quality of the front wheel cover. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the utility model provides a welding jig for a front wheel cover, which can prevent welding slag generated during welding from splashing onto the pressing shaft of the jig and avoid the welding slag from splashing onto the clamping area of the pressing shaft, so as to overcome the defects in the prior art.

[0005] The technical solution adopted by the utility model is as follows: a welding jig for a front wheel cover, which includes a base, a module arranged on the top of the base, a telescopic cylinder vertically arranged on one side of the base, a hinge frame arranged on the telescopic cylinder, a pressing frame hinged on the hinge frame, and a pressing shaft arranged on the pressing frame. One end of the pressing frame is hinged to the telescopic end of the telescopic cylinder, and the pressing shaft is located above the module. A fixing ring, a spring, and a connecting ring are sequentially sleeved on the pressing shaft along the direction close to the module. The fixing ring is fixedly sleeved on the top of the pressing shaft. Both ends of the spring are respectively installed on the fixing ring and the connecting ring. A fixing sleeve is sleeved on the connecting ring, and the bottom of the fixing sleeve is installed on the connecting ring. The spring, the fixing ring, and the pressing shaft are all movably sleeved in the fixing sleeve. The bottom end of the fixing sleeve is not higher than the bottom end of the pressing shaft. A sealing ring made of an elastic material is arranged at the bottom of the fixing sleeve.

[0006] Preferably, a sealing ring is arranged above the sealing ring. The sealing ring and the sealing ring are of an integral structure. The sealing ring is press-fitted and sleeved in the fixing sleeve. The bottom end of the fixing sleeve is threadedly sleeved with a fixing cover. The fixing cover adopts a cylindrical structure. A sleeve hole is opened on the cover plate of the fixing cover, and the sealing ring is sleeved in the sleeve hole. The sealing ring is squeezed between the fixing cover and the connecting ring.

[0007] Preferably, a sealing cover is movably sleeved on the top of the fixing cover. The sealing cover adopts an inverted cylindrical structure. The inner cavity diameter of the sealing cover is consistent with the outer wall diameter of the fixing cover. A perforation is opened on the cover plate of the sealing cover, and the perforation is sleeved on the fixing sleeve. The aperture of the perforation is consistent with the outer wall diameter of the fixing sleeve. The sealing cover is installed on the fixing sleeve.

[0008] Preferably, a bearing is sleeved on the connecting ring. The inner ring of the bearing is installed on the connecting ring. The bearing is movably sleeved in the fixing sleeve. A plurality of first threaded holes are uniformly opened on the fixing sleeve along the circumferential direction of the fixing sleeve. First bolts are respectively threadedly sleeved in the plurality of first threaded holes. The fixing sleeve is clamped on the outer ring of the bearing through the first bolts.

[0009] Preferably, a partition plate is arranged on one side of the fixing sleeve. The partition plate is installed on the fixing sleeve. A second threaded hole is opened on the other side of the fixing sleeve. The second threaded hole is located below the first threaded hole. A second bolt is threadedly sleeved in the second threaded hole. The fixing sleeve is clamped on the connecting ring below the bearing through the second bolt.

[0010] Preferably, a strip board is arranged between the partition board and the fixed sleeve. The middle part of the strip board is installed on the fixed sleeve. An adjustment groove is formed in the strip board. A screw rod is movably sleeved in the adjustment groove. One side of the screw rod is installed on the partition board. A nut is threadedly sleeved on the other side of the screw rod. The strip board is located between the nut and the partition board, and the strip board is clamped on the partition board by the nut.

[0011] Preferably, a fixed frame is arranged below the hinge frame. The bottom end of the fixed frame is installed on the telescopic cylinder. The top end of the fixed frame is hinged to the bottom end of the hinge frame. The top end of the hinge frame is hinged to the pressing frame. The pressing shaft and the telescopic cylinder are respectively located on both sides of the hinge frame. The top end of the pressing shaft is installed on the pressing frame.

[0012] The beneficial effects of the present utility model are as follows: First, the pressing shaft is wrapped by the fixed sleeve provided in the present utility model to isolate and protect the pressing shaft, so as to prevent the welding slag generated by welding from splashing onto the pressing shaft. Through the fixed ring, spring and connecting ring provided, when the front wheel cover is clamped between the pressing shaft and the module, the sealing ring can be pressed on the front wheel cover to prevent the welding slag generated by welding from splashing into the gap between the front wheel cover and the fixed sleeve, thereby preventing the splashed welding slag from falling into the clamping area of the pressing shaft to meet the needs of welding protection.

[0013] Second, the gap between the sealing ring and the fixed sleeve is sealed by the sealing ring provided in the present utility model to prevent impurities such as dust from entering the gap between the sealing ring and the fixed sleeve through the bottom end of the fixed sleeve. Through the fixed cover provided, the sealing ring and the sealing ring can be conveniently loaded and unloaded, so as to facilitate the maintenance or replacement of the sealing ring and the sealing ring. Moreover, the present utility model seals the gap between the fixed cover and the fixed sleeve through the sealing cover provided, thereby preventing the splashed welding slag from falling into the gap between the fixed cover and the fixed sleeve.

[0014] Third, through the bearing provided in the present utility model, the fixed sleeve can rotate around the connecting ring. Through the first threaded hole formed in the fixed sleeve and the first bolt threadedly sleeved on the first threaded hole, the fixed sleeve is clamped on the outer ring of the bearing by the first bolt, so as to facilitate the loading and unloading of the fixed sleeve and facilitate the maintenance or replacement of the fixed sleeve. Moreover, the present utility model limits the range of welding slag splash through the partition board provided to avoid the attachment of welding slag to the instrument, and fixes the rotating fixed sleeve through the second bolt provided, so as to facilitate the adjustment of the orientation of the partition board.

[0015] In addition, through the strip board, screw rod and nut provided in the present utility model, the partition board can be loaded and unloaded, and the position of the partition board can be conveniently adjusted to facilitate the adjustment of the range of limiting the welding slag splash. Moreover, through the fixed frame provided in the present utility model, by controlling the extension of the telescopic cylinder, the pressing frame can be driven to rotate, so as to clamp the front wheel cover between the pressing shaft and the module to meet the welding clamping requirements of the front wheel cover. Description of the Drawings

[0016] Figure 1 This is the first three-dimensional schematic diagram of the present utility model.

[0017] Figure 2 This is the second three-dimensional schematic diagram of the present utility model.

[0018] Figure 3 This is the assembled three-dimensional diagram of the pressure shaft, fixed sleeve and partition plate in the present utility model.

[0019] Figure 4 is Figure 3 the sectional view along the A-A direction in

[0020] Figure 5 is Figure 4 the enlarged schematic diagram at B in

[0021] Figure 6 This is the exploded view of the assembly of the pressure shaft and fixed sleeve in the present utility model.

[0022] Figure 7 This is the exploded view of the assembly of the fixed sleeve, sealing ring and fixed cover in the present utility model.

[0023] Figure 8 This is the exploded view of the assembly of the fixed sleeve, partition plate, first bolt and second bolt in the present utility model.

[0024] Figure 9 The usage state diagram of the present utility model for clamping the front wheel cover. Specific embodiments

[0025] Such as Figures 1 to 8As shown in the figure, a welding fixture for a front wheel housing includes a base 1, a module 6 provided on the top of the base 1, a telescopic cylinder 2 vertically provided on one side of the base 1, a hinge frame 3 provided on the telescopic cylinder 2, a pressing frame 4 hinged on the hinge frame 3, and a pressing shaft 5 provided on the pressing frame 4. One end of the pressing frame 4 is hinged to the telescopic end of the telescopic cylinder 2. The pressing shaft 5 is located above the module 6. A fixing ring 7, a spring 8, and a connecting ring 9 are sequentially sleeved on the pressing shaft 5 along the direction close to the module 6. The inner diameters of the fixing ring 7 and the connecting ring 9 respectively match the diameter of the pressing shaft 5. The fixing ring 7 is fixedly sleeved on the top of the pressing shaft 5. The two ends of the spring 8 are respectively installed on the fixing ring 7 and the connecting ring 9. A fixing sleeve 10 is sleeved on the connecting ring 9. The bottom of the fixing sleeve 10 is installed on the connecting ring 9. The spring 8, the fixing ring 7, and the pressing shaft 5 are all movably sleeved in the fixing sleeve 10. The bottom end of the fixing sleeve 10 is not higher than the bottom end of the pressing shaft 5. The outer wall of the fixing ring 7 is in contact with the inner wall of the fixing sleeve 10. The bottom of the fixing sleeve 10 is provided with a sealing ring 11 made of an elastic material. By providing the fixing sleeve 10 to wrap around the pressing shaft 5, the pressing shaft 5 can be isolated and protected, thereby preventing the welding slag generated during welding from splashing onto the pressing shaft 5. By providing the fixing ring 7, the spring 8, and the connecting ring 9, when the fixing sleeve 10 is squeezed, the fixing sleeve 10 and the connecting ring 9 can move up and down along the pressing shaft 5. Therefore, when the front wheel housing is clamped between the pressing shaft 5 and the module 6, the sealing ring 11 can be pressed on the front wheel housing. Since the sealing ring 11 is made of an elastic material, the sealing ring 11 deforms under pressure, so that the bottom surface of the sealing ring 11 fits on the front wheel housing to prevent the welding slag generated during welding from splashing into the gap between the front wheel housing and the fixing sleeve 10.

[0026] In this embodiment, a sealing ring 12 is provided above the sealing ring 11. The sealing ring 12 and the sealing ring 11 are of an integral structure. The sealing ring 12 is press-fitted in the fixing sleeve 10. The inner cavity diameter of the sealing ring 12 is not less than the outer wall diameter of the pressing shaft 5. The outer wall diameter of the sealing ring 12 is not less than the outer wall diameter of the sealing ring 11. The bottom end of the fixing sleeve 10 is threadedly sleeved with a fixing cover 13. The fixing cover 13 adopts a cylindrical structure. A sleeve hole 14 is opened on the cover plate of the fixing cover 13. The aperture of the sleeve hole 14 is not greater than the outer wall diameter of the sealing ring 12. The sealing ring 12 is sleeved in the sleeve hole 14. The sealing ring 12 is squeezed between the fixing cover 13 and the connecting ring 9, so as to install the sealing ring 12 and the sealing ring 11 between the fixing sleeve 10 and the connecting ring 9. By rotating the fixing cover 13, it is convenient to load and unload the sealing ring 12 and the sealing ring 11, so as to facilitate the maintenance or replacement of the sealing ring 12 and the sealing ring 11. The sealing ring 12 is used to seal the gap between the sealing ring 11 and the fixing sleeve 10 to prevent impurities such as dust from entering the gap between the sealing ring 11 and the fixing sleeve 10 through the bottom end of the fixing sleeve 10.

[0027] Specifically, a sealing cover 15 is movably sleeved on the top of the fixed cover 13. The sealing cover 15 adopts an inverted barrel structure. The inner cavity diameter of the sealing cover 15 is consistent with the outer wall diameter of the fixed cover 13. A perforation 16 is provided on the cover plate of the sealing cover 15. The perforation 16 is sleeved on the fixed sleeve 10, and the aperture diameter of the perforation 16 is consistent with the outer wall diameter of the fixed sleeve 10. The sealing cover 15 is installed on the fixed sleeve 10 to prevent splashing welding slag from falling into the gap between the fixed cover 13 and the fixed sleeve 10. Since the gap entrance between the sealing cover 15 and the fixed cover 13 is located at the bottom end of the sealing cover 15, the splashing welding slag is difficult to enter the gap between the sealing cover 15 and the fixed cover 13 in the direction from bottom to top. If it is to prevent the splashing welding slag from entering the gap between the sealing cover 15 and the fixed cover 13, a splash-proof ring made of elastic material can be installed at the bottom end of the sealing cover 15. The splash-proof ring is press-fitted and sleeved on the fixed cover 13 to seal the gap between the sealing cover 15 and the fixed cover 13.

[0028] Please participate again Figures 4 to 6 , a bearing 17 is sleeved on the connecting ring 9. The bearing 17 includes an inner ring, an outer ring rotatably sleeved on the inner ring, and a plurality of rotors arranged between the inner ring and the outer ring. The inner ring of the bearing 17 is installed on the connecting ring 9. The bearing 17 is movably sleeved in the fixed sleeve 10. A plurality of first threaded holes 18 are evenly provided on the fixed sleeve 10 along the circumferential direction of the fixed sleeve 10. A first bolt 19 is respectively threadedly sleeved in the plurality of first threaded holes 18. The fixed sleeve 10 is clamped on the outer ring of the bearing 17 through the first bolt 19. By turning the first bolt 19, it is convenient to load and unload the fixed sleeve 10, so as to facilitate the maintenance or replacement of the fixed sleeve 10. Through the provided bearing 17, the fixed sleeve 10 and the connecting ring 9 are rotatably connected to facilitate the rotation of the fixed sleeve 10 relative to the connecting ring 9.

[0029] In this embodiment, a partition plate 20 is provided on one side of the fixed sleeve 10. The partition plate 20 is installed on the fixed sleeve 10. A second threaded hole 21 is provided on the other side of the fixed sleeve 10. The second threaded hole 21 is located below the first threaded hole 18. A second bolt 22 is threadedly sleeved in the second threaded hole 21. The fixed sleeve 10 is clamped on the connecting ring 9 below the bearing 17 through the second bolt 22. The partition plate 20 is used to divide the welding area to limit the range of splashing welding slag. By turning the second bolt 22, the fixed sleeve 10 can be controlled to be in a rotating or fixed state to facilitate the adjustment of the orientation of the partition plate 20.

[0030] Specifically, a strip plate 23 is provided between the partition plate 20 and the fixed sleeve 10. The middle part of the strip plate 23 is installed on the fixed sleeve 10. An adjustment groove 24 is formed in the strip plate 23. A screw rod 25 is movably sleeved in the adjustment groove 24. One side of the screw rod 25 is installed on the partition plate 20. A nut 26 is threadedly sleeved on the other side of the screw rod 25. The strip plate 23 is located between the nut 26 and the partition plate 20. The strip plate 23 is clamped on the partition plate 20 by the nut 26. It should be noted that in order to prevent the partition plate 20 from rotating after being clamped and fixed by the strip plate 23, the number of the screw rods 25 is not less than two; by turning the nut 26, it is convenient to load and unload the partition plate 20, and by adjusting the position of the screw rod 25 in the adjustment groove 24, it is convenient to adjust the position of the partition plate 20.

[0031] Please participate again Figure 1 and 2 Below the articulated frame 3, a fixed frame 27 is provided. The bottom end of the fixed frame 27 is installed on the telescopic cylinder 2. The top end of the fixed frame 27 is hinged to the bottom end of the articulated frame 3. The top end of the articulated frame 3 is hinged to the pressing frame 4. The pressing shaft 5 and the telescopic cylinder 2 are respectively located on both sides of the articulated frame 3. The top end of the pressing shaft 5 is installed on the pressing frame 4; for this reason, when the telescopic cylinder 2 is controlled to extend, the pressing frame 4 is driven to rotate around the fixed frame 27 through the articulated frame 3, so as to drive the pressing shaft 5 to move towards the module 6, so as to clamp the front wheel cover between the pressing shaft 5 and the module 6.

[0032] The usage method of this product is as follows: As Figures 1 to 8As shown in the figure, first, check the amount of welding slag attached to the fixed sleeve 10, the sealing ring 11, and the partition plate 20. If there is a large amount of welding slag attached to the fixed sleeve 10, the sealing ring 11, or the partition plate 20, the fixed sleeve 10, the sealing ring 11, or the partition plate 20 should be removed in time. That is, by unscrewing the first bolt 19, the fixed sleeve 13, or the nut 26, it is convenient to remove the fixed sleeve 10, the sealing ring 11, or the partition plate 20, so as to facilitate the cleaning of the large amount of welding slag attached to the fixed sleeve 10, the sealing ring 11, or the partition plate 20, and replace the fixed sleeve 10, the sealing ring 11, or the partition plate 20 that has been cleaned to meet the requirements of clamping the front fender. Then, according to the requirements of the welding slag splash prevention area, adjust the orientation of the partition plate 20 to limit the range of welding slag splash, and fix the rotating fixed sleeve 10 by turning the second bolt 22, so as to fix the rotation of the partition plate 20. Then, place the front fender to be welded between the pressing shaft 5 and the module 6, control the telescopic cylinder 2 to extend, drive the articulated frame 3 and the pressing frame 4 to turn, so as to drive the pressing shaft 5 to press towards the module 6, and then clamp the front fender between the pressing shaft 5 and the module 6; at the same time, drive the fixed sleeve 10 and the sealing ring 11 to squeeze towards the front fender, and use the extrusion of the spring 8 to press the sealing ring 11 on the front fender. Finally, use welding tools such as a welding torch to weld the components of the front fender to the front fender clamped between the pressing shaft 5 and the module 6 to complete the welding operation of the front fender. In addition, it should be noted that as Figure 9 shown, the welding operation of the front fender is completed on the welding platform. In order to prevent the front fender from shaking during the welding process, a variety of welding fixtures such as edge clamps need to be used in combination for clamping to meet the welding of the front fender. This product is only one of the common welding fixtures for the front fender.

[0033] Through this embodiment, the fixed sleeve 10 is arranged to wrap the pressing shaft 5 and isolate and protect the pressing shaft 5 to prevent the welding slag generated by welding from splashing onto the pressing shaft 5. Through the arranged fixed ring 7, spring 8, and connecting ring 9, when the front fender is clamped between the pressing shaft 5 and the module 6, the sealing ring 11 can be pressed on the front fender to prevent the welding slag generated by welding from splashing into the gap between the front fender and the fixed sleeve 10, so as to prevent the splashed welding slag from falling into the clamping area of the pressing shaft 5 to meet the needs of welding protection.

[0034] The above-described embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the present invention patent should be included in the scope of the patent application of the present invention.

Claims

1. A welding fixture for a front fender, comprising a base (1), a module (6) arranged on the top of the base (1), a telescopic cylinder (2) vertically arranged on one side of the base (1), a hinge frame (3) arranged on the telescopic cylinder (2), a pressing frame (4) hinged on the hinge frame (3), and a pressing shaft (5) arranged on the pressing frame (4). One end of the pressing frame (4) is hinged to the telescopic end of the telescopic cylinder (2), and the pressing shaft (5) is located above the module (6). It is characterized in that: A fixed ring (7), a spring (8) and a connecting ring (9) are sequentially sleeved on the pressure shaft (5) along the direction close to the module (6). The fixed ring (7) is fixedly sleeved on the top of the pressure shaft (5). Two ends of the spring (8) are respectively installed on the fixed ring (7) and the connecting ring (9). A fixed sleeve (10) is sleeved on the connecting ring (9). The bottom of the fixed sleeve (10) is installed on the connecting ring (9). The spring (8), the fixed ring (7) and the pressure shaft (5) are all movably sleeved in the fixed sleeve (10). The bottom end of the fixed sleeve (10) is not higher than the bottom end of the pressure shaft (5). A sealing ring (11) made of elastic material is arranged at the bottom of the fixed sleeve (10).

2. The welding fixture for the front fender according to claim 1, characterized in that: A sealing ring (12) is arranged above the sealing ring (11). The sealing ring (12) and the sealing ring (11) are of an integral structure. The sealing ring (12) is press-fitted and sleeved in the fixed sleeve (10). The bottom end of the fixed sleeve (10) is threadedly sleeved with a fixed cover (13). The fixed cover (13) adopts a cylindrical structure. A sleeve hole (14) is opened on the cover plate of the fixed cover (13). The sealing ring (12) is sleeved in the sleeve hole (14). The sealing ring (12) is squeezed between the fixed cover (13) and the connecting ring (9).

3. The welding fixture for the front fender according to claim 2, characterized in that: A sealing cover (15) is movably sleeved on the top of the fixed cover (13). The sealing cover (15) adopts an inverted cylindrical structure. The inner cavity diameter of the sealing cover (15) is in line with the outer wall diameter of the fixed cover (13). A through hole (16) is opened on the cover plate of the sealing cover (15). The through hole (16) is sleeved on the fixed sleeve (10). The aperture of the through hole (16) is in line with the outer wall diameter of the fixed sleeve (10). The sealing cover (15) is installed on the fixed sleeve (10).

4. The welding jig for the front fender according to claim 1, characterized in that: A bearing (17) is sleeved on the connecting ring (9). The inner ring of the bearing (17) is installed on the connecting ring (9). The bearing (17) is movably sleeved in the fixed sleeve (10). A plurality of first threaded holes (18) are evenly opened on the fixed sleeve (10) along the circumferential direction of the fixed sleeve (10). A first bolt (19) is respectively threadedly sleeved in each of the plurality of first threaded holes (18). The fixed sleeve (10) is clamped on the outer ring of the bearing (17) through the first bolt (19).

5. The welding fixture for the front fender according to claim 4, characterized in that: A partition plate (20) is arranged on one side of the fixed sleeve (10). The partition plate (20) is installed on the fixed sleeve (10). A second threaded hole (21) is opened on the other side of the fixed sleeve (10). The second threaded hole (21) is located below the first threaded hole (18). A second bolt (22) is threadedly sleeved in the second threaded hole (21). The fixed sleeve (10) is clamped on the connecting ring (9) below the bearing (17) through the second bolt (22).

6. The welding jig for the front fender according to claim 5, characterized in that: A slat (23) is provided between the partition plate (20) and the fixing sleeve (10). The middle part of the slat (23) is mounted on the fixing sleeve (10). An adjustment groove (24) is formed in the slat (23). A screw rod (25) is movably sleeved in the adjustment groove (24). One side of the screw rod (25) is mounted on the partition plate (20). A nut (26) is threadedly sleeved on the other side of the screw rod (25). The slat (23) is located between the nut (26) and the partition plate (20). The slat (23) is clamped on the partition plate (20) by the nut (26).

7. The welding jig for the front fender according to claim 1, characterized in that: A fixing frame (27) is provided below the hinge frame (3). The bottom end of the fixing frame (27) is mounted on the telescopic cylinder (2). The top end of the fixing frame (27) is hinged to the bottom end of the hinge frame (3). The top end of the hinge frame (3) is hinged to the pressing frame (4). The pressing shaft (5) and the telescopic cylinder (2) are respectively located on both sides of the hinge frame (3). The top end of the pressing shaft (5) is mounted on the pressing frame (4).

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