Welding fixtures

Abstract

This utility model belongs to the field of seat manufacturing technology, especially welding fixtures. Addressing the problem that existing fixtures are insufficient for precise assembly and efficient welding of leg support frame assemblies due to the large number and varied shapes of components, leading to part deviations and low installation efficiency, this invention proposes the following solution: a first welding fixture, a second welding fixture, and a third welding fixture. The first welding fixture includes a first mounting plate, two sets of first fixing components, two sets of second fixing components, and one set of third fixing components. The second welding fixture includes a second mounting plate and two sets of fourth fixing components. In this utility model, the welding fixture, through the coordinated operation of the first, second, and third welding fixtures, functions independently and can flexibly adapt to different welding needs, significantly improving production efficiency. The built-in precision pressing and fixing mechanism ensures stable clamping of components, enhancing welding stability and quality reliability.

Description

Technical Field

[0001] This utility model relates to the field of seat manufacturing technology, and in particular to welding fixtures. Background Technology

[0002] In the current field of mechanical manufacturing, welding fixtures are key equipment for ensuring precise assembly and high-quality welding of parts. As users' demands for seat comfort and convenience increase, the manufacturing standards for seat leg rests are also rising, which in turn increases the requirements for the welding precision and efficiency of related components. However, traditional welding fixtures still have the following problems in use:

[0003] During the welding process of the leg support frame assembly, due to the large number of components involved, and their varying shapes and sizes, traditional welding fixtures are insufficient to meet the demands for precise assembly and efficient welding. For example, the welding of components such as the left / right leg support mounting bracket assembly, the upper cover plate welding assembly, and the extension motor bracket welding assembly requires the fixture to possess high flexibility and precise positioning capabilities. However, existing welding fixtures often cannot simultaneously meet these requirements, easily leading to deviations during the welding process, affecting product quality, and resulting in low component installation and positioning efficiency, thus impacting the overall efficiency of the welding work.

[0004] To address the aforementioned problems, this utility model document proposes welding fixtures. Utility Model Content

[0005] The purpose of this utility model is to solve the shortcomings of the existing technology, such as the large number and different shapes of parts when welding the leg support frame assembly, the difficulty of traditional tooling to meet the requirements of precise assembly and efficient welding, and the easy occurrence of part deviation and low installation efficiency. Therefore, the proposed welding tooling is proposed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Welding fixtures, including:

[0008] The first welding fixture includes a first mounting plate, two sets of first fixing components, two sets of second fixing components, and a set of third fixing components. The first welding fixture is used to place and fix multiple parts to complete the combined assembly of the left / right leg support mounting bracket assembly and the upper cover plate welding assembly.

[0009] It also includes a second welding fixture, which includes a second mounting plate and two sets of fourth fixing components. The second welding fixture is used to place and fix the extension motor bracket and other cooperating parts to complete the assembly of the extension motor bracket welding assembly.

[0010] It also includes a third welding fixture, which includes a third mounting plate, a first placement frame, and a second placement frame. The third welding fixture is used to place and fix the left / right leg support mounting bracket assembly with the upper cover plate welding assembly, the extension motor bracket welding assembly, and other matching parts to complete the assembly of the leg support frame assembly.

[0011] In one possible design, the two sets of first fixing components and the two sets of second fixing components are symmetrically distributed and located on both sides of the third fixing component; the first fixing component includes a first movable seat slidably disposed on the top of the first mounting plate, a first cylinder fixedly mounted on the top of the first mounting plate, one end of the piston rod of the first cylinder being fixedly connected to one side of the first movable seat, a first pressing mechanism fixedly mounted on one side of the first movable seat, a second pressing mechanism and a third pressing mechanism fixedly embedded on the top of the first mounting plate, the second pressing mechanism and the third pressing mechanism being located on both sides of the first movable seat respectively, and the first pressing mechanism, the second pressing mechanism, and the third pressing mechanism all cooperating with the first movable seat to complete the clamping and fixing of the corresponding parts; the second fixing component includes a sliding... The first mounting plate has a second movable seat movably mounted on top of it. A second cylinder is fixedly mounted on the top of the first mounting plate. One end of the piston rod of the second cylinder is fixedly connected to one side of the second movable seat. A fourth pressing mechanism is fixedly mounted on one side of the second movable seat. The fourth pressing mechanism cooperates with the second movable seat to clamp and fix the corresponding components. The third fixing assembly includes a third movable seat slidably mounted on top of the first mounting plate. A third cylinder is fixedly mounted on the top of the first mounting plate. One end of the piston rod of the third cylinder is fixedly connected to one side of the third movable seat. A fourth cylinder is fixedly mounted on one side of the third movable seat. An abutment plate is fixedly mounted on one end of the piston rod of the fourth cylinder. The abutment plate cooperates with the third movable seat to clamp and fix the corresponding components.

[0012] In one possible design, two sets of the fourth fixing components are symmetrically arranged, and the same fixing plate is fixedly installed at their bottom. The fixing plate is fixedly installed on the top of the second mounting plate. The fourth fixing component includes a fourth movable seat that is slidably installed on the top of the fixing plate. A fifth cylinder is fixedly installed on the top of the fixing plate. One end of the piston rod of the fifth cylinder is fixedly connected to one side of the fourth movable seat. Two fifth pressing mechanisms are fixedly installed on the top of the fourth movable seat through a bracket. The fourth fixing component also includes two sixth pressing mechanisms arranged on both sides of the fourth movable seat. Both sixth pressing mechanisms are fixedly installed on the top of the fixing plate. The two sixth pressing mechanisms and the two fifth pressing mechanisms cooperate with the fourth movable seat to complete the clamping and fixing of the corresponding parts.

[0013] In one possible design, both the first and second placement racks are fixedly mounted on the top of the third mounting plate. The first and second placement racks cooperate with each other to place the components to be installed. Seventh pressing mechanisms are provided on both sides of the first placement rack and on the side away from the second placement rack. All three seventh pressing mechanisms are fixedly connected to the top of the third mounting plate and cooperate with the first placement rack to press and fix the corresponding components. An eighth pressing mechanism is provided on the side of the first placement rack closest to the second placement rack. The eighth pressing mechanism is fixedly mounted on the top of the third mounting plate and cooperates with the second placement rack. Ninth pressing mechanisms are provided on both sides of the second placement rack. Two ninth pressing mechanisms are fixedly mounted on the top of the third mounting plate and cooperate with the second placement rack to press and fix the corresponding components.

[0014] In one possible design, the first pressing mechanism, the second pressing mechanism, the third pressing mechanism, the fourth pressing mechanism, the three sets of seventh pressing mechanisms, the two sets of ninth pressing mechanisms, the two sets of fifth pressing mechanisms, and the two sets of sixth pressing mechanisms all have the same structure. They are all composed of a drive cylinder, a mounting base, a rotating bracket, a rotating head, and a pressing plate. The mounting base is fixedly installed on the top of the drive cylinder. One end of the piston rod of the drive cylinder passes through the mounting base and is fixedly connected to the rotating head. The rotating bracket is rotatably installed on the top of the mounting base. One end of the pressing plate is rotatably connected to the rotating head. The outer wall of the pressing plate is rotatably connected to the rotating bracket. The drive cylinder can drive the pressing plate to perform lever movement with the rotating bracket as a fulcrum, so as to realize the lifting and lowering of one end of the pressing plate.

[0015] In one possible design, four support legs are fixedly installed on the bottom of the first mounting plate, the third mounting plate, and the second mounting plate to secure them to the platform to be installed. A photoelectric switch is fixedly installed on one side of the first mounting plate, the third mounting plate, and the second mounting plate to control multiple components to operate.

[0016] In this application, when the first welding fixture is in use, the operator can place the various components required for the left / right leg support mounting bracket assembly and the upper cover plate welding assembly into the corresponding positions on the first mounting plate; the first fixing component, the second fixing component and the third fixing component work together to clamp and fix the components;

[0017] Once all components are secured, the welding operation of the left / right leg support mounting bracket assembly and the upper cover plate welding assembly can be carried out. After welding is completed, the piston rods of each cylinder are retracted to release the clamps on the components, and the operator can remove the welded assembly from the first welding fixture.

[0018] When the second welding fixture is in use, the operator can place the extension motor bracket and other related parts on the fixed plate; the fourth fixing component starts to work, the piston rod of the fifth cylinder extends, and pushes the fourth moving seat to slide on the top of the fixed plate; the two fifth pressing mechanisms on the top of the fourth moving seat move accordingly, and at the same time, the two sixth pressing mechanisms on both sides of the fourth moving seat (fixed on the fixed plate) cooperate with the fifth pressing mechanisms, and the multiple pressing mechanisms work together to apply pressure to the parts to complete the clamping and fixing;

[0019] After the components are secured, the welding operation of the extension motor bracket welding assembly can be carried out. After the welding is completed, the corresponding extension motor bracket welding assembly can be removed from the second welding fixture.

[0020] When the third welding fixture is in use, the operator places the left / right leg support mounting bracket assembly, the upper cover plate welding assembly, the extension motor bracket welding assembly, and other components on the first and second placement frames respectively; similarly, multiple sets of seventh, eighth, and ninth pressing mechanisms can work simultaneously to press and fix the corresponding components.

[0021] After all components are secured, the leg support frame assembly is welded. Once welding is complete, the operator can remove the welded leg support frame assembly from the third welding fixture.

[0022] When multiple pressing mechanisms are in operation, their corresponding drive cylinders will push one end of the corresponding pressing rod to lift and lower. At this time, the other end of the corresponding pressing rod can rotate the bracket as a fulcrum to move synchronously, thereby completing the pressing and releasing of the corresponding parts.

[0023] Beneficial effects: In this utility model, the welding fixture is made up of a first welding fixture, a second welding fixture and a third welding fixture, each of which has an independent function and positioning capability; this design makes the use of the fixture more flexible, and allows for quick selection and placement of parts according to different welding requirements, which greatly improves production efficiency.

[0024] In this invention, the welding fixtures, including the three welding fixtures, are equipped with precise pressing and fixing mechanisms. For example, the first fixing component, the second fixing component, and the third fixing component in the first welding fixture, as well as the fourth fixing component in the second welding fixture, all adopt a cylinder-driven and pressing plate lever motion method to achieve precise clamping and fixing of the parts. This design not only improves the stability during the welding process but also ensures the reliability of the welding quality.

[0025] In this utility model, the welding fixture is equipped with support legs at the bottom of each mounting plate, which facilitates fixing it to the platform to be installed. At the same time, photoelectric switches are provided on one side of each mounting plate to control the operation of multiple components, which improves the automation level and operational safety of the fixture, and effectively enhances the convenience and safety of operation.

[0026] In this utility model, the welding fixture, through the coordinated operation of the first, second, and third welding fixtures, functions independently and can flexibly adapt to different welding needs, significantly improving production efficiency. The built-in precision pressing and fixing mechanism of the fixture can ensure the stable clamping of parts, enhancing welding stability and quality reliability. In addition, the bottom support leg design of the mounting plate facilitates platform fixation, and the side photoelectric switch enables intelligent control of components, which not only improves the level of automation but also ensures safe and convenient operation, comprehensively optimizing the welding operation process and achieving efficient, precise, and safe welding production. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural schematic diagram of the welding fixture proposed in this utility model;

[0028] Figure 2 This is a schematic diagram of the first welding fixture structure proposed in this utility model;

[0029] Figure 3 This is a schematic diagram of the third welding fixture structure proposed in this utility model;

[0030] Figure 4 This is a schematic diagram of the second welding fixture structure proposed in this utility model;

[0031] Figure 5 This is a schematic diagram of the pressing mechanism of the welding fixture proposed in this utility model.

[0032] In the diagram: 1. Left / right leg support mounting bracket assembly and upper cover plate welding assembly; 2. Leg support frame assembly; 3. Extension motor bracket welding assembly; 4. First welding fixture; 5. Third welding fixture; 6. Second welding fixture; 7. First mounting plate; 8. First movable seat; 9. First cylinder; 10. First pressing mechanism; 11. Second pressing mechanism; 12. Third pressing mechanism; 13. Second movable seat; 14. Second cylinder; 15. Fourth pressing mechanism; 16. Third movable seat ; 17. Third cylinder; 18. Fourth cylinder; 19. Abutment plate; 20. Third mounting plate; 21. First placement frame; 22. Seventh pressing mechanism; 23. Second placement frame; 24. Eighth pressing mechanism; 25. Ninth pressing mechanism; 26. Second mounting plate; 27. Fourth moving seat; 28. Fifth cylinder; 29. ​​Fifth pressing mechanism; 30. Sixth pressing mechanism; 31. Drive cylinder; 32. Mounting seat; 33. Rotating bracket; 34. Rotating head; 35. Pressing plate. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0034] Example 1: Refer to Figure 1-5 A tooling fixture includes: a first welding fixture 4, a second welding fixture 6 and a third welding fixture 5, wherein each part works in concert to complete the welding assembly of different parts.

[0035] In this embodiment, the first welding fixture 4 is used to place and fix multiple components to complete the assembly of the left / right leg support mounting bracket assembly and the upper cover welding assembly 1. The first welding fixture 4 includes a first mounting plate 7, two sets of first fixing components, two sets of second fixing components, and one set of third fixing components. Specifically, the first mounting plate 7 serves as the mounting base for the entire first welding fixture 4, and four corresponding support legs are fixedly mounted on its bottom. These four support legs fix the first mounting plate 7 to the platform to be installed. Simultaneously, a corresponding photoelectric switch is fixedly installed on one side of the first mounting plate 7, which is used to control the operation of multiple components.

[0036] Furthermore, in this embodiment, the two sets of first fixing components are symmetrically distributed and are located on both sides of the third fixing component. The first fixing component includes a first movable seat 8 slidably disposed on the top of the first mounting plate 7. A first cylinder 9 is fixedly mounted on the top of the first mounting plate 7, and one end of the piston rod of the first cylinder 9 is fixedly connected to one side of the first movable seat 8. When the piston rod of the first cylinder 9 extends or retracts, it can drive the first movable seat 8 to slide on the first mounting plate 7. A first pressing mechanism 10 is fixedly mounted on one side of the first movable seat 8, and a second pressing mechanism 11 and a third pressing mechanism 12 are fixedly embedded on the top of the first mounting plate 7. The second pressing mechanism 11 and the third pressing mechanism 12 are respectively located on both sides of the first movable seat 8. The first pressing mechanism 10, the second pressing mechanism 11, and the third pressing mechanism 12 all cooperate with the first movable seat 8 to complete the clamping and fixing of the corresponding components.

[0037] Furthermore, in this embodiment, the two sets of second fixing components are also symmetrically distributed and located on both sides of the third fixing component. The second fixing component includes a second movable seat 13 slidably disposed on the top of the first mounting plate 7. A second cylinder 14 is fixedly mounted on the top of the first mounting plate 7, and one end of the piston rod of the second cylinder 14 is fixedly connected to one side of the second movable seat 13. The extension and retraction of the piston rod of the second cylinder 14 can drive the second movable seat 13 to slide. A fourth pressing mechanism 15 is fixedly mounted on one side of the second movable seat 13. The fourth pressing mechanism 15 cooperates with the second movable seat 13 to complete the clamping and fixing of the corresponding components.

[0038] Furthermore, in this embodiment, the third fixing component includes a third movable seat 16 slidably disposed on the top of the first mounting plate 7. A third cylinder 17 is fixedly mounted on the top of the first mounting plate 7, and one end of the piston rod of the third cylinder 17 is fixedly connected to one side of the third movable seat 16. The extension and retraction of the piston rod of the third cylinder 17 causes the third movable seat 16 to slide. A fourth cylinder 18 is fixedly mounted on one side of the third movable seat 16, and an abutment plate 19 is fixedly mounted on one end of the piston rod of the fourth cylinder 18. The abutment plate 19 cooperates with the third movable seat 16 to complete the clamping and fixing of the corresponding components.

[0039] In this embodiment, the second welding fixture 6 is used to place and fix the extension motor bracket and other mating components to complete the assembly of the extension motor bracket welding assembly 3. The second welding fixture 6 includes a second mounting plate 26 and two sets of fourth fixing components. Four corresponding support legs are fixedly mounted on the bottom of the second mounting plate 26 for fixing it to the platform to be installed. A corresponding photoelectric switch is also fixedly mounted on one side of the second mounting plate 26 for controlling the operation of the components. The two sets of fourth fixing components are symmetrically arranged, and the same fixing plate is fixedly mounted on their bottoms. The fixing plate is fixedly mounted on the top of the second mounting plate 26.

[0040] Furthermore, in this embodiment, the fourth fixing component includes a fourth movable seat 27 slidably mounted on the top of the fixing plate, and a fifth cylinder 28 fixedly mounted on the top of the fixing plate. One end of the piston rod of the fifth cylinder 28 is fixedly connected to one side of the fourth movable seat 27. The extension and retraction of the piston rod of the fifth cylinder 28 causes the fourth movable seat 27 to slide.

[0041] Furthermore, in this embodiment, two fifth pressing mechanisms 29 are fixedly installed on the top of the fourth movable seat 27 via a bracket. The fourth fixing assembly also includes two sixth pressing mechanisms 30 disposed on both sides of the fourth movable seat 27, and both sixth pressing mechanisms 30 are fixedly installed on the top of the fixing plate. The two sixth pressing mechanisms 30 and the two fifth pressing mechanisms 29 cooperate with the fourth movable seat 27 to complete the clamping and fixing of the corresponding components.

[0042] In this embodiment, the third welding fixture 5 is used to place and fix the left / right leg support mounting bracket assembly with the upper cover plate welding assembly 1, the extension motor bracket welding assembly 3, and other cooperating components to complete the assembly of the leg support frame assembly 2. The third welding fixture 5 includes a third mounting plate 20, a first placement frame 21, and a second placement frame 23. Four corresponding support legs are fixedly installed on the bottom of the third mounting plate 20 to fix it on the platform to be installed. A corresponding photoelectric switch is fixedly installed on one side of the third mounting plate 20 to control the operation of the components.

[0043] Furthermore, in this embodiment, the first placement frame 21 and the second placement frame 23 are both fixedly installed on the top of the third mounting plate 20. The first placement frame 21 and the second placement frame 23 cooperate with each other and are both used to place the parts to be installed.

[0044] Furthermore, in this embodiment, a seventh pressing mechanism 22 is provided on both sides of the first placement frame 21 and on the side away from the second placement frame 23. All three seventh pressing mechanisms 22 are fixedly connected to the top of the third mounting plate 20. All three seventh pressing mechanisms 22 cooperate with the first placement frame 21 to complete the pressing and fixing of the corresponding components.

[0045] Furthermore, in this embodiment, an eighth pressing mechanism 24 is provided on the side of the first placement frame 21 near the second placement frame 23. The eighth pressing mechanism 24 is fixedly installed on the top of the third mounting plate 20 and cooperates with the second placement frame 23.

[0046] Furthermore, in this embodiment, a ninth pressing mechanism 25 is provided on both sides of the second placement frame 23. Both ninth pressing mechanisms 25 are fixedly installed on the top of the third mounting plate 20. Both ninth pressing mechanisms 25 cooperate with the second placement frame 23 to complete the pressing and fixing of the corresponding components.

[0047] This application can be used in the field of seat manufacturing technology, or in other fields applicable to this application.

[0048] Example 2: Reference Figure 2 , 3 4, 5, Improvements based on Example 1: Welding fixtures, which are applied to the field of seat manufacturing technology;

[0049] In this embodiment, the first pressing mechanism 10, the second pressing mechanism 11, the third pressing mechanism 12, the fourth pressing mechanism 15, the three sets of seventh pressing mechanisms 22, the two sets of ninth pressing mechanisms 25, the two sets of fifth pressing mechanisms 29, and the two sets of sixth pressing mechanisms 30 all have the same structure, and each is composed of a drive cylinder 31, a mounting base 32, a rotating bracket 33, a rotating head 34, and a pressing plate 35.

[0050] The mounting base 32 is fixedly mounted on the top of the drive cylinder 31. One end of the piston rod of the drive cylinder 31 passes through the mounting base 32 and is fixedly connected to the rotating head 34. The rotating bracket 33 is rotatably mounted on the top of the mounting base 32. One end of the pressing plate 35 is rotatably connected to the rotating head 34, and the outer wall of the pressing plate 35 is rotatably connected to the rotating bracket 33. The drive cylinder 31 can drive the pressing plate 35 to perform lever movement with the rotating bracket 33 as the fulcrum, so as to lift and lower one end of the pressing plate 35, thereby completing the pressing and fixing or releasing of the parts.

[0051] However, as is well known to those skilled in the art, the working principles and wiring methods of the first cylinder 9, the second cylinder 14, the third cylinder 17, the fourth cylinder 18, the fifth cylinder 28, the drive cylinder 31, and the corresponding photoelectric switches are commonplace and belong to conventional methods or common knowledge. They will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0052] The working principle and usage process of this technical solution are as follows: When the first welding fixture 4 is in use, the operator can place the various parts required for the left / right leg support mounting bracket assembly and the upper cover plate welding assembly 1 into the corresponding positions of the first mounting plate 7; the first fixing component, the second fixing component and the third fixing component work together to clamp and fix the parts;

[0053] Once all components are secured, the welding operation can be carried out between the left / right leg support mounting bracket assembly and the upper cover plate welding assembly 1. After welding is completed, the piston rods of each cylinder retract, releasing the clamps on the components. The operator can then remove the welded assembly from the first welding fixture 4.

[0054] When the second welding fixture 6 is in use, the operator can place the extension motor bracket and other related components on the fixed plate; the fourth fixing component starts to work, the piston rod of the fifth cylinder 28 extends, and pushes the fourth moving seat 27 to slide on the top of the fixed plate; the two fifth pressing mechanisms 29 on the top of the fourth moving seat 27 move accordingly, and at the same time, the two sixth pressing mechanisms 30 on both sides of the fourth moving seat 27 (fixed on the fixed plate) cooperate with the fifth pressing mechanisms 29, and multiple pressing mechanisms work together to apply pressure to the components to complete the clamping and fixing;

[0055] After the components are fixed, the welding operation of the extension motor bracket welding assembly 3 can be carried out. After the welding is completed, the corresponding extension motor bracket welding assembly 3 can be removed from the second welding fixture 6.

[0056] When the third welding fixture 5 is in use, the operator places the left / right leg support mounting bracket assembly, the upper cover plate welding assembly 1, the extension motor bracket welding assembly 3, and other components on the first placement frame 21 and the second placement frame 23 respectively; similarly, multiple sets of seventh pressing mechanisms 22, eighth pressing mechanisms 24 and ninth pressing mechanisms 25 can work simultaneously to press and fix the corresponding components.

[0057] After all the components are fixed in place, the leg support frame assembly 2 is welded. After welding is completed, the operator can remove the welded leg support frame assembly 2 from the third welding fixture 5.

[0058] When multiple pressing mechanisms are in operation, their corresponding drive cylinders 31 will push one end of the corresponding pressing rod 35 to lift and lower. At this time, the other end of the corresponding pressing rod 35 can rotate the bracket 33 as a fulcrum to move synchronously, thereby completing the pressing and releasing of the corresponding parts.

[0059] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0060] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. Welding fixture, characterized in that, include: The first welding fixture (4) includes a first mounting plate (7), two sets of first fixing components, two sets of second fixing components and a set of third fixing components. The first welding fixture (4) is used to place and fix multiple parts to complete the combined assembly of the left / right leg support mounting bracket assembly and the upper cover welding assembly (1). It also includes a second welding fixture (6), which includes a second mounting plate (26) and two sets of fourth fixing components. The second welding fixture (6) is used to place and fix the extension motor bracket and other cooperating parts to complete the assembly of the extension motor bracket welding assembly (3). It also includes a third welding fixture (5), which includes a third mounting plate (20), a first placement frame (21), and a second placement frame (23). The third welding fixture (5) is used to place and fix the left / right leg support mounting bracket assembly, the upper cover plate welding assembly (1), the extension motor bracket welding assembly (3), and other matching parts to complete the assembly of the leg support frame assembly (2).

2. The welding fixture according to claim 1, characterized in that, The two sets of first fixing components and the two sets of second fixing components are symmetrically distributed and are located on both sides of the third fixing component; the first fixing component includes a first movable seat (8) slidably disposed on the top of the first mounting plate (7), a first cylinder (9) is fixedly mounted on the top of the first mounting plate (7), one end of the piston rod of the first cylinder (9) is fixedly connected to one side of the first movable seat (8), a first pressing mechanism (10) is fixedly mounted on one side of the first movable seat (8), a second pressing mechanism (11) and a third pressing mechanism (12) are fixedly embedded on the top of the first mounting plate (7), the second pressing mechanism (11) and the third pressing mechanism (12) are respectively located on both sides of the first movable seat (8), the first pressing mechanism (10), the second pressing mechanism (11) and the third pressing mechanism (12) all cooperate with the first movable seat (8) to complete the clamping and fixing of the corresponding parts; the second fixing component includes a first movable seat (8) slidably disposed on the top of the first mounting plate (7) The second movable seat (13) has a second cylinder (14) fixedly installed on the top of the first mounting plate (7). One end of the piston rod of the second cylinder (14) is fixedly connected to one side of the second movable seat (13). A fourth pressing mechanism (15) is fixedly installed on one side of the second movable seat (13). The fourth pressing mechanism (15) cooperates with the second movable seat (13) to complete the clamping and fixing of the corresponding parts. The third fixing component includes a third movable seat (16) slidably disposed on the top of the first mounting plate (7). A third cylinder (17) is fixedly installed on the top of the first mounting plate (7). One end of the piston rod of the third cylinder (17) is fixedly connected to one side of the third movable seat (16). A fourth cylinder (18) is fixedly installed on one side of the third movable seat (16). One end of the piston rod of the fourth cylinder (18) is fixedly installed with an abutment plate (19). The abutment plate (19) cooperates with the third movable seat (16) to complete the clamping and fixing of the corresponding parts.

3. The welding fixture according to claim 2, characterized in that, The two sets of fourth fixing components are symmetrically arranged, and the same fixing plate is fixedly installed at their bottom. The fixing plate is fixedly installed on the top of the second mounting plate (26). The fourth fixing component includes a fourth movable seat (27) that is slidably installed on the top of the fixing plate. A fifth cylinder (28) is fixedly installed on the top of the fixing plate. One end of the piston rod of the fifth cylinder (28) is fixedly connected to one side of the fourth movable seat (27). Two fifth pressing mechanisms (29) are fixedly installed on the top of the fourth movable seat (27) by a bracket. The fourth fixing component also includes two sixth pressing mechanisms (30) arranged on both sides of the fourth movable seat (27). The two sixth pressing mechanisms (30) are fixedly installed on the top of the fixing plate. The two sixth pressing mechanisms (30) and the two fifth pressing mechanisms (29) cooperate with the fourth movable seat (27) to complete the clamping and fixing of the corresponding parts.

4. The welding fixture according to claim 3, characterized in that, The first placement bracket (21) and the second placement bracket (23) are both fixedly installed on the top of the third mounting plate (20). The first placement bracket (21) and the second placement bracket (23) cooperate with each other and are used to place the parts to be installed. A seventh pressing mechanism (22) is provided on both sides of the first placement bracket (21) and on the side away from the second placement bracket (23). The three seventh pressing mechanisms (22) are all fixedly connected to the top of the third mounting plate (20). The three seventh pressing mechanisms (22) cooperate with the first placement bracket (21) to press and fix the corresponding parts. The first placement frame (21) is provided with an eighth pressing mechanism (24) on the side near the second placement frame (23). The eighth pressing mechanism (24) is fixedly installed on the top of the third mounting plate (20) and cooperates with the second placement frame (23). The second placement frame (23) is provided with a ninth pressing mechanism (25) on both sides. The two ninth pressing mechanisms (25) are fixedly installed on the top of the third mounting plate (20) and cooperate with the second placement frame (23) to complete the pressing and fixing of the corresponding parts.

5. The welding fixture according to any one of claims 2-4, characterized in that, The first pressing mechanism (10), the second pressing mechanism (11), the third pressing mechanism (12), the fourth pressing mechanism (15), the three sets of seventh pressing mechanisms (22), the two sets of ninth pressing mechanisms (25), the two sets of fifth pressing mechanisms (29), and the two sets of sixth pressing mechanisms (30) all have the same structure. They are all composed of a driving cylinder (31), a mounting base (32), a rotating bracket (33), a rotating head (34), and a pressing plate (35). The mounting base (32) is fixedly installed on the top of the driving cylinder (31). In this unit, one end of the piston rod of the driving cylinder (31) passes through the mounting base (32) and is fixedly connected to the rotating head (34). The rotating bracket (33) is rotatably mounted on the top of the mounting base (32). One end of the pressing plate (35) is rotatably connected to the rotating head (34). The outer wall of the pressing plate (35) is rotatably connected to the rotating bracket (33). The driving cylinder (31) can drive the pressing plate (35) to perform lever movement with the rotating bracket (33) as the fulcrum, so as to realize the lifting and lowering of one end of the pressing plate (35).

6. The welding fixture according to claim 1, characterized in that, The bottom of the first mounting plate (7), the third mounting plate (20), and the second mounting plate (26) are all fixedly equipped with four support legs to fix them to the platform to be installed. A photoelectric switch is fixedly installed on one side of the first mounting plate (7), the third mounting plate (20), and the second mounting plate (26) to control multiple components to work.

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