Special tool for welding A stand column welding assembly

Abstract

The invention belongs to the technical field of welding equipment, and particularly discloses a special welding tool for an A stand column welding assembly, which comprises a welding workbench, and a control system, a supporting assembly, a clamping assembly and a positioning assembly which are mounted on the welding workbench, and the supporting assembly is used for supporting a first sheet metal part; the positioning assembly is used for positioning the first sheet metal part and the second sheet metal part, and the clamping assembly is used for pressing the first sheet metal part and the second sheet metal part. By arranging the supporting assembly, the clamping assembly and the positioning assembly, positioning and clamping of the first sheet metal part and the second sheet metal part can be achieved, it is guaranteed that the positions of the first sheet metal part and the second sheet metal part are accurate, and the first sheet metal part and the second sheet metal part cannot move in the welding process.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding equipment, and particularly relates to a special welding fixture for welding an A-pillar welding assembly. Background Art

[0002] The automotive A-pillar is a connecting column that connects the roof and the front, left, and right compartments. For an automobile, the A-pillar not only plays a supporting role but also serves as a door frame; it is the first to bear the frontal collision of the vehicle head, protecting the passenger compartment from deformation and preventing the wheels and suspension from invading the passenger compartment.

[0003] As Figure 1 shown, the automotive A-pillar includes a first sheet metal part 1 and a second sheet metal part 2. Usually, the second sheet metal part 2 is placed inside the first sheet metal part 1 and positioned for welding and fixing. Currently, after manual positioning, spot welding is usually performed using welding equipment for positioning, and then welding is carried out, which may lead to inaccurate welding positioning. There are also fixture tools used to position and clamp the first sheet metal part 1 and the second sheet metal part 2. However, during the clamping process of the current welding fixture, it may block the welding position, making it difficult for the welding equipment to perform welding. Summary of the Invention

[0004] The purpose of the present invention is to provide a special welding fixture for welding an A-pillar welding assembly to solve the problem that the existing welding fixture blocks the welding position during clamping.

[0005] To achieve the above purpose, the technical solution of the present invention is as follows: A special welding fixture for welding an A-pillar welding assembly includes a welding workbench and a control system, a support component, a clamping component, and a positioning component installed on the welding workbench; the control system is used to control the clamping component and the positioning component; the support component is used to support the first sheet metal part, the positioning component is used to position the first sheet metal part and the second sheet metal part, and the clamping component is used to press the first sheet metal part and the second sheet metal part; the L-shaped first sheet metal part is divided into an installation side and an outer edge side, and the installation side is used to install the second sheet metal part; on both sides of the second sheet metal part, there are provided shaped welding plates that match the inner side of the first sheet metal part; on the outer edge of one side of the installation side of the first sheet metal part, there is a notch, and on the second sheet metal part, there is an ear corresponding to the notch.

[0006] The support assembly includes a first support base and a second support base. The first support base and the second support base are installed on the welding workbench. The first support base and the second support base are respectively located on both sides of the installation side, and the first support base is located on the side away from the outer edge side. Two sets of support structures are installed on the first support base. The two sets of support structures are respectively located on both sides of one end of the installation side of the first sheet metal part away from the outer edge side. Each set of support structures includes a first bottom support block and a first side support block. The first bottom support block is used to support the bottom of the first sheet metal part, and the first side support block is used to support the outer edge of the side of the first sheet metal part. A second bottom support block and a second side support block are installed on the second support base. The second bottom support block is used to support the bottom of the first sheet metal part near the outer edge side, and the second side support block is used to support the outer edge of the side of the first sheet metal part.

[0007] The clamping assembly includes a third support base, a first pressing mechanism and a second pressing mechanism. The third support base is installed on the welding workbench. The first pressing mechanism is installed on the third support base, and the second pressing mechanism is installed on the first support base. The first pressing mechanism includes a first driving member, a first connecting plate, four groups of connecting rods and four groups of first upper pressing blocks. The first driving member is installed on the third support base. The driving end of the first driving member is connected to the first connecting plate. Two groups of connecting rods are respectively connected to both sides of the first connecting plate. The four groups of connecting rods are respectively connected to the four groups of first upper pressing blocks. The four groups of first upper pressing blocks are respectively used to press both sides of the two sides of the second sheet metal part. The first driving member drives the first upper pressing blocks to press on the second sheet metal part through the first connecting plate and the connecting rods. The second pressing mechanism includes a second driving member, a second connecting plate and two groups of second upper pressing blocks. The second driving member is installed on the first support base. The driving end of the second driving member is connected to the second connecting plate. The side of the second connecting plate away from the second driving member is of a C-shaped structure. The two sides of the C-shaped structure are respectively connected to the two groups of second upper pressing blocks. The two groups of second upper pressing blocks are used to press on the outer edge of the side of the first sheet metal part and correspond to the first side support blocks. The second driving member drives the second upper pressing blocks to press on the outer edge of the side of the first sheet metal part through the second connecting plate.

[0008] The positioning component includes a first sheet metal positioning structure and a second sheet metal positioning structure. The first sheet metal positioning structure includes two groups of first positioning members, and the two groups of first positioning members are respectively installed on a first support base and a second support base. First through holes are provided on both sides of the first sheet metal, and the two groups of first positioning members are used to be inserted into the first through holes on both sides for positioning. The second sheet metal positioning structure includes two groups of second positioning members, and the two groups of second positioning members are respectively installed on both sides of a first connecting plate. Two groups of second through holes are provided on the second sheet metal, and the two groups of second positioning members are used to be inserted into the two groups of second through holes for positioning.

[0009] Furthermore, the first sheet metal positioning structure further includes a fourth support base, a third driving member, and a third positioning member. The fourth support base is installed on the welding workbench, and the third driving member is installed on the fourth support base. The third driving member is used to drive the third positioning member to move linearly. A third through hole is provided on the side of the installation side of the first sheet metal, and the third positioning member is used to be inserted into the third through hole for positioning.

[0010] Furthermore, a lifting ring is provided on the top of the welding workbench.

[0011] Furthermore, a moving component is provided on the lower side of the welding workbench.

[0012] Furthermore, an installation base is provided below the welding workbench. Four installation seats are provided at the bottom of the welding workbench, and the four installation seats are distributed in a rectangular shape. A vertical pulley and a horizontal pulley are provided on each installation seat. The vertical pulley can slide horizontally on the top of the installation base, and the horizontal pulley can slide horizontally on the outside of the installation base. Vertical through holes are provided on two of the installation seats, and installation columns capable of being aligned with the vertical through holes are provided on the installation base. A limiting column capable of rotating and moving vertically is provided in the installation column, and the limiting column can vertically move and be inserted into the vertical through hole for limiting. A vertical groove and a horizontal groove are provided on the installation column. The upper side of the vertical groove communicates with the horizontal groove. A groove is provided at the bottom of the horizontal groove away from the vertical groove. A limiting rod is connected to the limiting column, and the limiting rod can slide in the horizontal groove and the vertical groove, and the limiting rod can be located in the groove.

[0013] Furthermore, a handle component is installed on the welding workbench. The handle component includes a U-shaped tube and two L-shaped tubes. The horizontal sides of the two L-shaped tubes are connected to the welding workbench. The two sides of the U-shaped tube are connected to the vertical sides of the two L-shaped tubes through connecting pieces, and the U-shaped tube can rotate.

[0014] Furthermore, the connecting piece adopts a double-headed screw and two groups of nuts. Fourth through holes are correspondingly provided on the U-shaped pipe and the L-shaped pipe. The double-headed screw can pass through the fourth through holes on the U-shaped pipe and the L-shaped pipe, and the threaded section is located outside the fourth through holes. The two groups of nuts are respectively threadedly connected to the outside of the double-headed screw.

[0015] Furthermore, limit blocks are installed on both the first support base and the third support base. Limit grooves are provided on the limit blocks. The first connecting plate or the second connecting plate can move into the limit grooves; the limit grooves are used to limit the extreme pressing positions of the first connecting plate and the second connecting plate.

[0016] The working principle of this technical solution is as follows:

[0017] Place the first sheet metal part on the first bottom support block, the first side support block, the second bottom support block and the second side support block, and insert the first positioning part and the third positioning part into the first through hole and the third through hole on the first sheet metal part respectively for positioning. Then start the second driving part. The second driving part drives two groups of second upper pressing blocks to press on the outer edge of the side of the first sheet metal part through the second connecting plate. Then place the second sheet metal part at the corresponding position of the first sheet metal part, and make the lug located at the notch position and the profiling welding plate located at the profiling position inside the first sheet metal part. Then start the first driving part. The first driving part drives the first upper pressing block to press on the second sheet metal part through the first connecting plate and the connecting rod, and drives the second positioning part to insert into the second through hole for positioning. Then the welding tool can be started to perform welding. After welding is completed, start the first driving part, the second driving part and the third driving part. The first driving part drives the first upper pressing block and the second positioning part to move away from the second sheet metal part through the first connecting plate and the connecting rod. The second driving part drives the second upper pressing block to move away from the first sheet metal part through the second connecting plate. The third driving part drives the third positioning part to move away from the first sheet metal part. Finally, take out the first sheet metal part.

[0018] The beneficial effects of this technical solution are as follows:

[0019] ① By setting the support assembly, the clamping assembly and the positioning assembly, this technical solution can realize the positioning and clamping of the first sheet metal part and the second sheet metal part, ensure the accurate positions of the first sheet metal part and the second sheet metal part, and prevent them from moving during the welding process.

[0020] ② In this technical solution, by setting the side of the second connecting plate away from the second driving part as a C-shaped structure and connecting four connecting rods to the first connecting plate, the interference with the welding tool can be reduced, and the welding position can be prevented from being blocked.

[0021] ③In this technical solution, the first connecting plate and the second connecting plate are limited by setting a limiting groove, so as to prevent the first upper pressing block and the second upper pressing block from damaging the first sheet metal part and the second sheet metal part.

[0022] ④In this technical solution, a lifting ring is set to facilitate the lifting of the welding workbench.

[0023] ⑤In this technical solution, by setting a moving component, the entire welding workbench can be moved, and a handle component is set to pull the welding workbench.

[0024] ⑥In this technical solution, by setting a limiting column, a limiting rod and a mounting column, the relative position between the welding workbench and the mounting base can be limited. When the limiting column moves downward and disengages from the vertical through hole, the limiting column is separated from the mounting seat, and the mounting seat can move horizontally and vertically on the mounting base. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the A column;

[0026] Figure 2 is a schematic structural diagram of the special welding tooling for the A column welding assembly of the present invention;

[0027] Figure 3 is Figure 2 the first three-dimensional view of the middle support assembly, the second pressing mechanism, and the first sheet metal part positioning structure;

[0028] Figure 4 is Figure 2 the second three-dimensional view of the middle support assembly, the second pressing mechanism, and the first sheet metal part positioning structure;

[0029] Figure 5 is Figure 2 the structural schematic diagram of the first pressing mechanism and the second sheet metal part positioning structure;

[0030] Figure 6 is Figure 2 the structural schematic diagram at the mounting seat. Detailed Description of the Invention

[0031] The following is a further detailed description through specific embodiments:

[0032] The reference numerals in the accompanying drawings of the specification include: the first sheet metal part 1, the second sheet metal part 2, the first through hole 3, the second through hole 4, the conformal welding plate 5, the support ear 6, the notch 7, the installation side 8, the outer edge side 9, the welding workbench 10, the installation base 11, the moving component 12, the lifting ring 13, the control system 14, the first support base 15, the second support base 16, the third support base 17, the fourth support base 18, the second driving part 19, the first driving part 20, the third driving part 21, the second connecting plate 22, the U-shaped structure 23, the first connecting plate 24, the connecting rod 25, the first side support block 26, the first bottom support block 27, the second upper pressing block 28, the first upper pressing block 29, the first positioning part 30, the second positioning part 31, the third positioning part 32, the installation column 33, the limit column 34, the vertical groove 35, the horizontal groove 36, the limit rod 37, the horizontal pulley 38, the vertical pulley 39, the installation seat 40, the L-shaped pipe 41, the U-shaped pipe 42, the connecting part 43, the second side support block 44, the second bottom support block 45.

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] The embodiment is basically as shown in the attached Figures 1-6 figures: A special welding tool for the A-column welding assembly, as shown in Figure 2 the figures, includes a welding workbench 10 and a control system 14, a support assembly, a clamping assembly, and a positioning assembly installed on the welding workbench 10; the control system 14 is used to control the clamping assembly and the positioning assembly; the support assembly is used to support the first sheet metal part 1, the positioning assembly is used to position the first sheet metal part 1 and the second sheet metal part 2, and the clamping assembly is used to press the first sheet metal part 1 and the second sheet metal part 2. As shown in Figure 1 the figures, the L-shaped first sheet metal part 1 is divided into an installation side 8 and an outer edge side 9, and the installation side 8 is used to install the second sheet metal part 2; conformal welding plates 5 (a total of four groups) that match the inner side of the first sheet metal part 1 are respectively provided on both sides of the second sheet metal part 2. A notch 7 is provided on the outer edge of one side of the installation side 8 of the first sheet metal part 1, and a support ear 6 corresponding to the notch 7 is provided on the second sheet metal part 2.

[0035] As shown in Figure 3 and 4As shown, the support assembly includes a first support base 15 and a second support base 16. The first support base 15 and the second support base 16 are installed on the welding workbench 10. The first support base 15 and the second support base 16 are respectively located on both sides of the installation side 8, and the first support base 15 is located on the side away from the outer edge side 9. Two sets of support structures are installed on the first support base 15, and the two sets of support structures are respectively located on both sides of one end of the installation side 8 of the first sheet metal part 1 away from the outer edge side 9. Each set of support structures includes a first bottom support block 27 and a first side support block 26. The first bottom support block 27 is used to support the bottom of the first sheet metal part 1, and the first side support block 26 is used to support the outer edge of the side of the first sheet metal part 1. Two sets of second bottom support blocks 45 and one set of second side support blocks 44 are installed on the second support base 16. The two sets of second bottom support blocks 45 are used to support both sides of the bottom of the first sheet metal part 1 close to the outer edge side 9, and the second side support block 44 is used to support the outer edge of the side of the first sheet metal part 1.

[0036] As Figure 5 shown, the clamping assembly includes a third support base 17, a first pressing mechanism and a second pressing mechanism. The third support base 17 is installed on the welding workbench 10. The first pressing mechanism is installed on the third support base 17, and the second pressing mechanism is installed on the first support base 15. The first pressing mechanism includes a first driving member 20, a first connecting plate 24, four sets of connecting rods 25 and four sets of first upper pressing blocks 29. The first driving member 20 is installed on the third support base 17. The driving end of the first driving member 20 is connected to the first connecting plate 24. Two sets of connecting rods 25 are respectively connected to both sides of the first connecting plate 24. The four sets of connecting rods 25 are respectively connected to the four sets of first upper pressing blocks 29. The four sets of first upper pressing blocks 29 are respectively used to press both sides of the two sides of the second sheet metal part 2. The first driving member 20 drives the first connecting plate 24 and the connecting rods 25 to rotate, so as to drive the first upper pressing blocks 29 to press on the second sheet metal part 2. As Figure 3 、 4 shown, the second pressing mechanism includes a second driving member 19, a second connecting plate 22 and two sets of second upper pressing blocks 28. The second driving member 19 is installed on the first support base 15. The driving end of the second driving member 19 is connected to the second connecting plate 22. The side of the second connecting plate 22 away from the second driving member 19 is provided with a U-shaped structure 23. Both sides of the U-shaped structure 23 are respectively connected to the two sets of second upper pressing blocks 28. The two sets of second upper pressing blocks 28 are used to press on the outer edge of the side of the first sheet metal part 1 and correspond to the first side support blocks 26. The second driving member 19 drives the second connecting plate 22 to rotate, so as to drive the second upper pressing blocks 28 to press on the outer edge of the side of the first sheet metal part 1.

[0037] The positioning assembly includes a first sheet metal part positioning structure and a second sheet metal part positioning structure. As Figure 3 、4 As shown, the first sheet metal part positioning structure includes two groups of first positioning parts 30, and the two groups of first positioning parts 30 are respectively installed on the first support base 15 and the second support base 16. The two sides of the first sheet metal part 1 are provided with first through holes 3, and the two groups of first positioning parts 30 are used to be inserted into the first through holes 3 on both sides for positioning. As Figures 3-5 As shown, the second sheet metal part positioning structure includes a fourth support base 18, a third driving part 21, a third positioning part 32 and two groups of second positioning parts 31. The two groups of second positioning parts 31 are respectively installed on both sides of the first connecting plate 24; two groups of second through holes 4 are provided on the second sheet metal part 2, and the two groups of second positioning parts 31 are used to be inserted into the two groups of second through holes 4 for positioning. The fourth support base 18 is installed on the welding workbench 10, and the third driving part 21 is installed on the fourth support base 18; the third driving part 21 is used to drive the third positioning part 32 to move linearly; a third through hole is provided on the side of the installation side 8 of the first sheet metal part 1, and the third positioning part 32 is used to be inserted into the third through hole for positioning.

[0038] Limit blocks are installed on both the first support base 15 and the third support base 17, and limit grooves are provided on the limit blocks. The first connecting plate 24 or the second connecting plate 22 can move into the limit grooves; the limit grooves are used to limit the extreme pressing positions of the first connecting plate 24 and the second connecting plate 22.

[0039] A lifting ring 13 is provided on the top of the welding workbench 10. A moving component 12 is provided on the lower side of the welding workbench 10, and the moving component 12 can adopt driving wheels.

[0040] As Figure 6 As shown, an installation base 11 is provided below the welding workbench 10; four groups of mounting seats 40 are provided at the bottom of the welding workbench 10, and the four groups of mounting seats 40 are distributed in a rectangle. Each group of mounting seats 40 is provided with a vertical pulley 39 and a horizontal pulley 38. The vertical pulley 39 can slide horizontally on the top of the installation base 11, and the horizontal pulley 38 can slide horizontally on the outside of the installation base 11; vertical through holes are provided on two of the groups of mounting seats 40, and mounting columns 33 that can be aligned with the vertical through holes are provided on the installation base 11. A limit column 34 that can rotate and move vertically is provided in the mounting column 33, and the limit column 34 can move vertically and be inserted into the vertical through hole for limiting. A vertical groove 35 and a horizontal groove 36 are provided on the mounting column 33, and the upper side of the vertical groove 35 is communicated with the horizontal groove 36. A groove is provided at the bottom of the horizontal groove 36 far from the vertical groove 35; a limit rod 37 is connected to the limit column 34, and the limit rod 37 can slide in the horizontal groove 36 and the vertical groove 35, and the limit rod 37 can be located in the groove.

[0041] As Figure 2As shown in the figure, a handle assembly is installed on the welding workbench 10. The handle assembly includes a U-shaped tube 42 and two L-shaped tubes 41. The horizontal sides of the two L-shaped tubes 41 are connected to the welding workbench 10; both sides of the U-shaped tube 42 are connected to the vertical sides of the two L-shaped tubes 41 through connectors 43, and the U-shaped tube 42 can rotate. The connector 43 uses a double-headed screw and two groups of nuts. Corresponding fourth through holes are provided on the U-shaped tube 42 and the L-shaped tube 41. The double-headed screw can pass through the fourth through holes on the U-shaped tube 42 and the L-shaped tube 41 and the threaded section is located outside the fourth through hole. The two groups of nuts are respectively threadedly connected to the outside of the double-headed screw.

[0042] The specific implementation process is as follows:

[0043] Place the first sheet metal part 1 on the first bottom support block 27, the first side support block 26, the second bottom support block 45 and the second side support block 44, and insert the first positioning member 30 and the third positioning member 32 into the first through hole 3 and the third through hole on the first sheet metal part 1 respectively for positioning. Then start the second driving member 19, and the second driving member 19 drives two groups of second upper pressing blocks 28 to press on the outer edge of the side of the first sheet metal part 1 through the second connecting plate 22. Then place the second sheet metal part 2 in the corresponding position of the first sheet metal part 1, and make the lug 6 located at the notch 7, and the conforming welding plate 5 located at the conforming position inside the first sheet metal part 1. After that, start the first driving member 20, and the first driving member 20 drives the first upper pressing block 29 to press on the second sheet metal part 2 through the first connecting plate 24 and the connecting rod 25, and drives the second positioning member 31 to insert into the second through hole 4 for positioning. After that, the welding tool can be started to perform welding. After welding is completed, start the first driving member 20, the second driving member 19 and the third driving member 21. The first driving member 20 drives the first upper pressing block 29 and the second positioning member 31 to move away from the second sheet metal part 2 through the first connecting plate 24 and the connecting rod 25. The second driving member 19 drives the second upper pressing block 28 to move away from the first sheet metal part 1 through the second connecting plate 22. The third driving member 21 drives the third positioning member 32 to move away from the first sheet metal part 1. Finally, take out the first sheet metal part 1.

[0044] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0045] The above are only embodiments of the present invention. Specific structures and common knowledge such as characteristics well-known in the art are not described in detail herein. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the invention pertains before the filing date or the priority date, can know all the prior art in this field, and have the ability to apply conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, combine their own abilities to improve and implement this solution. Some typical well-known structures or well-known methods should not become an obstacle for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope claimed in this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. The special welding tooling for the welding of the A column welding assembly is characterized in that: It includes a welding workbench (10) and a control system (14), a support assembly, a clamping assembly, and a positioning assembly installed on the welding workbench (10); the control system (14) is used to control the clamping assembly and the positioning assembly; the support assembly is used to support the first sheet metal part (1), the positioning assembly is used to position the first sheet metal part (1) and the second sheet metal part (2), and the clamping assembly is used to press the first sheet metal part (1) and the second sheet metal part (2); the L-shaped first sheet metal part (1) is divided into an installation side (8) and an outer edge side (9), and the installation side (8) is used to install the second sheet metal part (2); on both sides of the second sheet metal part (2), there are provided follow-shaped welding plates (5) that match the inner side of the first sheet metal part (1); on one outer edge of one side of the installation side (8) of the first sheet metal part (1), there is a notch (7), and on the second sheet metal part (2), there is an ear (6) corresponding to the notch (7). The support assembly includes a first support base (15) and a second support base (16), the first support base (15) and the second support base (16) are installed on the welding workbench (10), the first support base (15) and the second support base (16) are respectively located on both sides of the installation side (8), and the first support base (15) is located on the side away from the outer edge side (9); two groups of support structures are installed on the first support base (15), and the two groups of support structures are respectively located on both sides of one end of the installation side (8) of the first sheet metal part (1) away from the outer edge side (9); each group of support structures includes a first bottom support block (27) and a first side support block (26), the first bottom support block (27) is used to support the bottom of the first sheet metal part (1), and the first side support block (26) is used to support the outer edge of the side of the first sheet metal part (1); a second bottom support block (45) and a second side support block (44) are installed on the second support base (16), the second bottom support block (45) is used to support the bottom of the first sheet metal part (1) close to the outer edge side (9), and the second side support block (44) is used to support the outer edge of the side of the first sheet metal part (1). The clamping assembly includes a third support base (17), a first pressing mechanism, and a second pressing mechanism. The third support base (17) is installed on the welding workbench (10). The first pressing mechanism is installed on the third support base (17), and the second pressing mechanism is installed on the first support base (15). The first pressing mechanism includes a first driving member (20), a first connecting plate (24), four groups of connecting rods (25), and four groups of first upper pressing blocks (29). The first driving member (20) is installed on the third support base (17), and the driving end of the first driving member (20) is connected to the first connecting plate (24). Two groups of the connecting rods (25) are respectively connected to both sides of the first connecting plate (24), and the four groups of connecting rods (25) are respectively connected to the four groups of first upper pressing blocks (29). The four groups of first upper pressing blocks (29) are respectively used to press both sides of two sides of the second sheet metal part (2). The first driving member (20) drives the first upper pressing blocks (29) to press on the second sheet metal part (2) through the first connecting plate (24) and the connecting rods (25). The second pressing mechanism includes a second driving member (19), a second connecting plate (22), and two groups of second upper pressing blocks (28). The second driving member (19) is installed on the first support base (15), and the driving end of the second driving member (19) is connected to the second connecting plate (22). The side of the second connecting plate (22) away from the second driving member (19) is provided with a U-shaped structure (23), and both sides of the U-shaped structure (23) are respectively connected to the two groups of second upper pressing blocks (28). The two groups of second upper pressing blocks (28) are used to press on the outer edge of the side of the first sheet metal part (1) and correspond to the first side support block (26). The second driving member (19) drives the second upper pressing blocks (28) to press on the outer edge of the side of the first sheet metal part (1) through the second connecting plate (22). The positioning assembly includes a first sheet metal part (1) positioning structure and a second sheet metal part (2) positioning structure. The first sheet metal part (1) positioning structure includes two groups of first positioning members (30). The two groups of first positioning members (30) are respectively installed on the first support base (15) and the second support base (16). First through holes (3) are provided on both sides of the first sheet metal part (1). The two groups of first positioning members (30) are used to be inserted into the first through holes (3) on both sides for positioning. The second sheet metal part (2) positioning structure includes two groups of second positioning members (31). The two groups of second positioning members (31) are respectively installed on both sides of the first connecting plate (24). Two groups of second through holes (4) are provided on the second sheet metal part (2). The two groups of second positioning members (31) are used to be inserted into the two groups of second through holes (4) for positioning.

2. The special welding tooling for the A-pillar welding assembly according to claim 1, characterized in that: The positioning structure of the first sheet metal part (1) further includes a fourth support base (18), a third driving part (21) and a third positioning part (32). The fourth support base (18) is installed on the welding workbench (10), and the third driving part (21) is installed on the fourth support base (18). The third driving part (21) is used to drive the third positioning part (32) to move linearly. A third through hole is provided on the side of the installation side (8) of the first sheet metal part (1), and the third positioning part (32) is used to be inserted into the third through hole for positioning.

3. The special welding tooling for the A-pillar welding assembly according to claim 1, characterized in that: A lifting ring (13) is provided on the top of the welding workbench (10).

4. The special welding tooling for the A-pillar welding assembly according to claim 1, characterized in that: A moving assembly (12) is provided on the lower side of the welding workbench (10).

5. The special welding tooling for the A-pillar welding assembly according to claim 4, characterized in that: An installation base (11) is provided below the welding workbench (10). Four groups of mounting seats (40) are provided at the bottom of the welding workbench (10), and the four groups of mounting seats (40) are distributed in a rectangle. A vertical pulley (39) and a horizontal pulley (38) are provided on each group of mounting seats (40). The vertical pulley (39) can slide horizontally on the top of the installation base (11), and the horizontal pulley (38) can slide horizontally on the outside of the installation base (11). Vertical through holes are provided on two of the groups of mounting seats (40), and mounting columns (33) capable of being aligned with the vertical through holes are provided on the installation base (11). A limiting column (34) capable of rotating and moving vertically is provided in the mounting column (33), and the limiting column (34) can vertically move and be inserted into the vertical through hole for limiting. A vertical groove (35) and a horizontal groove (36) are provided on the mounting column (33), and the upper side of the vertical groove (35) communicates with the horizontal groove (36). A groove is provided at the bottom of the horizontal groove (36) away from the vertical groove (35). A limiting rod (37) is connected to the limiting column (34), and the limiting rod (37) can slide in the horizontal groove (36) and the vertical groove (35), and the limiting rod (37) can be located in the groove.

6. The special welding tooling for the A-pillar welding assembly according to claim 1, characterized in that: A handle assembly is installed on the welding workbench (10). The handle assembly includes a U-shaped tube (42) and two L-shaped tubes (41). The horizontal sides of the two L-shaped tubes (41) are connected to the welding workbench (10). The two sides of the U-shaped tube (42) are connected to the vertical sides of the two L-shaped tubes (41) through connectors (43), and the U-shaped tube (42) can rotate.

7. The special welding tooling for the A-pillar welding assembly according to claim 6, characterized in that: The connector (43) adopts a double-headed screw and two groups of nuts. Corresponding fourth through holes are provided on the U-shaped tube and the L-shaped tube. The double-headed screw can pass through the fourth through holes on the U-shaped tube and the L-shaped tube and the threaded section is located outside the fourth through hole. The two groups of nuts are respectively threadedly connected to the outside of the double-headed screw.

8. The special welding tooling for the A-pillar welding assembly according to claim 1, characterized in that: Limit blocks are installed on both the first support base (15) and the third support base (17). Limit grooves are provided on the limit blocks, and the first connecting plate (24) or the second connecting plate (22) can move into the limit grooves; the limit grooves are used to limit the extreme pressing positions of the first connecting plate (24) and the second connecting plate (22).

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