A welding fixture for leg support frame

Abstract

This utility model belongs to the field of seat manufacturing technology, and in particular, it is a welding fixture for leg support frames. Addressing the problems of existing traditional leg support welding fixtures, such as simple structure, poor positioning accuracy, cumbersome and inefficient component assembly, and difficulty in ensuring welding accuracy and consistency, the following solution is proposed: It includes a first welding fixture, a second welding fixture, and a third welding fixture. The first welding fixture comprises two first fixtures and one second fixture, with the two first fixtures having symmetrical structures. In this utility model, the leg support frame welding fixture achieves high-precision positioning and rapid welding of each component of the leg support frame through a modular multi-tool collaborative design. Three sets of dedicated tooling are used to adapt to different structural assemblies, forming a multi-dimensional fixing system combined with a sliding positioning mechanism and a pneumatic pressing component to ensure welding positioning accuracy. By configuring a support positioning structure and a photoelectric control system, assembly efficiency is significantly improved while ensuring operational safety.

Description

Technical Field

[0001] This utility model relates to the field of seat manufacturing technology, and in particular to a welding fixture for a leg support frame. Background Technology

[0002] In the field of seat manufacturing, the leg support frame, as a crucial component of the seat, directly impacts the overall performance and comfort of the seating due to its structural stability and welding precision. The leg support frame is typically assembled from multiple connecting rods, support components, and other parts through welding. These components require precise positioning and reliable fixation during welding to ensure the welded frame structure meets design requirements. However, traditional welding fixtures still suffer from the following technical shortcomings in practical applications:

[0003] The leg support frame is composed of multiple complex-shaped parts, which need to be assembled and welded through multiple processes. However, traditional tooling is not convenient for rapid and accurate assembly of parts due to its simple structure and insufficient positioning accuracy. Specifically, when using traditional welding tooling, operators need to repeatedly adjust the position of parts and manually fix them, which is time-consuming and labor-intensive. This not only results in low welding efficiency but also makes it difficult to guarantee welding accuracy and consistency.

[0004] To address the aforementioned problems, this utility model document proposes a welding fixture for the leg support frame. Utility Model Content

[0005] The purpose of this utility model is to solve the shortcomings of the existing technology, such as the simple structure of the traditional leg support welding fixture, poor positioning accuracy, cumbersome and inefficient assembly of parts, and difficulty in ensuring welding accuracy and consistency. Therefore, a leg support frame welding fixture is proposed.

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

[0007] A welding fixture for a leg support frame, comprising:

[0008] The first welding fixture includes two symmetrical first fixtures and second fixtures. The first fixture is provided with a first mounting plate, a first sliding seat, a first cylinder, a second pressing mechanism, a third pressing mechanism, a fourth pressing mechanism and a fifth pressing mechanism. The second fixture is provided with a second mounting plate and a second sliding seat.

[0009] The second welding fixture includes a third mounting plate, a third sliding seat, a positioning pin, an eighth pressing mechanism, a ninth pressing mechanism, a tenth pressing mechanism, and an eleventh pressing mechanism;

[0010] The third welding fixture includes a fourth mounting plate, a fourth sliding seat, a first abutting mechanism, a support seat, a nineteenth pressing mechanism, and a twentieth pressing mechanism;

[0011] The first cylinder, the second cylinder, the third cylinder and the fourth cylinder respectively drive the corresponding sliding seat to move. Each pressing mechanism includes a driving cylinder, a rotating bracket and a pressing plate. The driving cylinder drives the pressing plate to perform a lever pressing action through the rotating bracket.

[0012] In one possible design, the third, fourth, and fifth pressing mechanisms in the first tooling are arranged in a triangular pattern and form a three-dimensional positioning structure with the first pressing mechanism on the first sliding seat.

[0013] In one possible design, the second tooling has two sixth pressing mechanisms on the top of the second sliding seat, and the second mounting plate has two seventh pressing mechanisms. The sixth and seventh pressing mechanisms are symmetrically distributed to clamp the workpiece.

[0014] In one possible design, the top of the third sliding seat of the second welding fixture is horizontally fixed with a positioning pin, the eighth pressing mechanism and the tenth pressing mechanism are arranged on both sides of the third sliding seat, and the eleventh pressing mechanism is distributed around the third sliding seat to form a three-dimensional clamping.

[0015] In one possible design, the first abutting mechanism of the third welding fixture penetrates the fourth mounting plate, the thirteenth pressing mechanism and the fourteenth pressing mechanism are symmetrically arranged on both sides of the first abutting mechanism, and the top of the fourth sliding seat is provided with the twelfth pressing mechanism; the fourteenth pressing mechanism is fixedly provided with the fifteenth pressing mechanism on both sides by brackets to assist in the fixing of the corresponding parts.

[0016] In one possible design, the top of the support base of the third welding fixture is provided with a sixteenth pressing mechanism and a seventeenth pressing mechanism, and the second abutting mechanism and the eighteenth pressing mechanism cooperate to form a center node pressing structure.

[0017] In one possible design, the piston rod of the driving cylinder of the pressing mechanism is connected to the rotating head, one end of the pressing plate is hinged to the rotating head, and the other end is hinged to the mounting seat fixedly installed on the top of the driving cylinder through the rotating bracket. When the driving cylinder extends and retracts, the pressing plate performs lever movement around the rotating bracket.

[0018] In one possible design, both the first abutting mechanism and the second abutting mechanism include a cylinder and an abutting plate, with the cylinder driving the abutting plate to move linearly to form complementary positioning.

[0019] In one possible design, the bottom of the first mounting plate, the second mounting plate, the third mounting plate, and the fourth mounting plate are all provided with support legs, and the top is provided with photoelectric switches to control the action of each cylinder in a linkage manner.

[0020] In this application, when the first welding fixture is in use, the operator can place the components required for the left connecting rod welding assembly and the right connecting rod welding assembly on the first mounting plates of the two first fixtures respectively; at the same time, the components of the left connecting rod welding assembly can be placed on the second mounting plate of the second fixture; then, multiple cylinders are activated to clamp and fix the corresponding components. After all components are fixed, welding operations are performed; after completion, each cylinder is reset to release the clamps so that the welding assembly can be removed.

[0021] When using the second welding fixture, the operator can place the components of the extension leg support frame assembly on the third mounting plate; then, multiple cylinders can be activated to clamp and fix the corresponding components. After all components are fixed, welding operations can be performed; after completion, each cylinder is reset and the clamping is released so that the extension leg support frame assembly can be removed.

[0022] When using the third welding fixture, the operator can place the components of the leg support frame sub-assembly on the fourth mounting plate; then, multiple cylinders can be activated to clamp and fix the corresponding components. After all components are fixed, welding operations can be performed; after completion, each cylinder is reset to release the clamps so that the leg support frame sub-assembly can be removed.

[0023] In this welding fixture, multiple pressing mechanisms operate on the same principle. Each mechanism uses the piston rod of a corresponding drive cylinder to extend and retract, causing the rotating head and pressing plate to move around the fulcrum of the rotating bracket. When the drive cylinder extends, one end of the pressing plate presses down to secure the parts; when it retracts, the pressing plate lifts to release the clamped parts. Simultaneously, the first and second abutting mechanisms, driven by cylinders, move their abutting plates linearly, allowing them to complement the positioning of adjacent pressing mechanisms.

[0024] Beneficial effects: In this utility model, the leg support frame welding fixture is designed with a first welding fixture, a second welding fixture and a third welding fixture, which are respectively designed to accurately position and fix different components of the leg support frame, ensuring that the relative positions of each component are accurate during the welding process, thereby greatly improving the welding precision; at the same time, the coordinated work between the fixtures can realize the rapid assembly and welding of the leg support frame, significantly improving production efficiency.

[0025] In this utility model, the leg support frame welding fixture adopts a modular design, and each fixture component can be flexibly adjusted and combined according to different models and structures of leg support frames to adapt to diverse production needs. For example, the first and second fixtures in the first welding fixture can be used for the combination and welding of the left connecting rod welding assembly, the right connecting rod welding assembly, and the left connecting rod welding assembly, respectively. The second and third welding fixtures are used for the placement, combination, and welding of the components of the extended leg support frame assembly and the leg support frame sub-assembly, respectively, reflecting the high adaptability and flexibility of the fixture.

[0026] In this utility model, the leg support frame welding fixture is equipped with various pressing mechanisms and fixing components, such as a first fixing component, a second fixing component, and a third fixing component. These components achieve stable fixing of the parts through the coordinated action of components such as sliding seats, cylinders, and pressing mechanisms. At the same time, the pressing mechanism adopts the lever principle design, and drives the pressing plate to perform lever movement through the driving cylinder, so as to lift and lower one end of the pressing plate, thereby obtaining a large pressing effect with a small driving force and further optimizing the fixing effect.

[0027] In this utility model, a welding fixture for a leg support frame is designed with the operator's convenience and safety in mind. The fixture components are rationally arranged, and the interface is clear and easy to understand, facilitating quick learning and proficiency. Each fixture has a fixed support leg at its bottom for secure attachment to the platform, ensuring stability and safety during operation. Furthermore, each fixture has a fixed control component such as a photoelectric switch at its top for precise control of the working status of multiple components, further enhancing operational safety and reliability.

[0028] In this invention, the leg support frame welding fixture achieves high-precision positioning and rapid welding of each component of the leg support frame through modular multi-tool collaborative design: three sets of special tooling are used to adapt to different structural assemblies, and a multi-dimensional fixing system is formed by combining a sliding positioning mechanism and a pneumatic pressing component to ensure welding positioning accuracy; the tooling layout conforms to ergonomics, and is equipped with a support positioning structure and a photoelectric control system, which greatly improves assembly efficiency while ensuring operational safety, and effectively solves the technical problems of poor positioning accuracy and low processing efficiency of traditional tooling. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural schematic diagram of a welding fixture for a leg support frame proposed in this utility model;

[0030] Figure 2 This is a schematic diagram of the first tooling structure of a welding fixture for a leg support frame proposed in this utility model;

[0031] Figure 3 This is a schematic diagram of the second tooling structure of a leg support frame welding fixture proposed in this utility model;

[0032] Figure 4 This is a schematic diagram of the second welding fixture structure of a leg support frame welding fixture proposed in this utility model;

[0033] Figure 5 This is a schematic diagram of the third welding fixture structure of a leg support frame welding fixture proposed in this utility model;

[0034] Figure 6 This is a schematic diagram of the pressing mechanism of a welding fixture for a leg support frame proposed in this utility model.

[0035] In the diagram: 1. Left connecting rod one welding assembly; 2. Right connecting rod one welding assembly; 3. Left connecting rod two welding assembly; 4. First welding fixture; 5. Extension leg support frame assembly; 6. Second welding fixture; 7. Leg support frame sub-assembly; 8. Third welding fixture; 9. First mounting plate; 10. First sliding seat; 11. First cylinder; 12. First pressing mechanism; 13. Second pressing mechanism; 14. Third pressing mechanism; 15. Fourth pressing mechanism; 16. Fifth pressing mechanism; 17. Second mounting plate; 18. Second sliding seat; 19. Second cylinder; 20. Sixth pressing mechanism; 21. Seventh pressing mechanism; 22. Third mounting plate; 23. Third sliding seat; 24. Third cylinder; 5. Positioning pin; 26. Eighth pressing mechanism; 27. Ninth pressing mechanism; 28. Tenth pressing mechanism; 29. ​​Eleventh pressing mechanism; 30. Fourth mounting plate; 31. Fourth sliding seat; 32. Fourth cylinder; 33. Twelfth pressing mechanism; 34. First abutting mechanism; 35. Thirteenth pressing mechanism; 36. Fourteenth pressing mechanism; 37. Fifteenth pressing mechanism; 38. Support seat; 39. Sixteenth pressing mechanism; 40. Seventeenth pressing mechanism; 41. Second abutting mechanism; 42. Eighteenth pressing mechanism; 43. Nineteenth pressing mechanism; 44. Twentieth pressing mechanism; 45. Drive cylinder; 46. Mounting seat; 47. Rotating bracket; 48. Rotating head; 49. Pressing plate. Detailed Implementation

[0036] 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.

[0037] Example 1: Refer to Figure 1-6 A welding fixture includes: a first welding fixture 4, a second welding fixture 6 and a third welding fixture 8. Each fixture is fixed to the surface of the welding platform by a support leg and is automatically controlled by a corresponding photoelectric switch.

[0038] In this embodiment, the first welding fixture 4 includes two symmetrically arranged first fixtures and one second fixture. Each first fixture is based on a first mounting plate 9, with a first sliding seat 10 slidably mounted on its top. The piston rod of the first cylinder 11 is connected to the side of the first sliding seat 10 to drive the first sliding seat 10 to move. A first pressing mechanism 12 is fixed on the top of the first sliding seat 10. This mechanism drives a rotating head 48 through a corresponding driving cylinder 45, which in turn drives a corresponding pressing plate 49 to perform lever motion with a rotating bracket 47 as the fulcrum, thereby achieving the clamping or releasing of the parts to be welded.

[0039] Furthermore, a second pressing mechanism 13, a third pressing mechanism 14, a fourth pressing mechanism 15, and a fifth pressing mechanism 16 are also fixed to the top of the first mounting plate 9. Among them, the second pressing mechanism 13 works in conjunction with the first fixing component, and the third to fifth pressing mechanisms are triangularly distributed to form a multi-point fixing structure for the left connecting rod-welded assembly 1 and the right connecting rod-welded assembly 2.

[0040] Furthermore, in this embodiment, the second tooling uses the second mounting plate 17 as a base, and a second sliding seat 18 is slidably disposed on its top. The second cylinder 19 can drive the second sliding seat 18 to move. The second sliding seat 18 supports two sixth pressing mechanisms 20 through a bracket. Two seventh pressing mechanisms 21 are also provided on the surface of the second mounting plate 17, which cooperate with the sixth pressing mechanisms 20 to complete the clamping and fixing of the left connecting rod second welding assembly 3.

[0041] In this embodiment, the second welding fixture 6 uses the third mounting plate 22 as its base, and two sets of third fixing components are symmetrically arranged on its top. Each set of third fixing components includes a third sliding seat 23, which is driven to slide by a third cylinder 24. The top of the third sliding seat 23 is fixedly mounted with a positioning pin 25 by a bracket, which can accurately position the parts. The eighth pressing mechanism 26, the tenth pressing mechanism 28, and four eleventh pressing mechanisms 29 are distributed around the third sliding seat 23, and cooperate with the ninth pressing mechanism 27 to form a three-dimensional fixing structure for the parts of the extension leg support frame assembly 5.

[0042] In this embodiment, the third welding fixture 8 is based on the fourth mounting plate 30, and a fourth fixing component, a fifth fixing component and a sixth fixing component are provided on its top.

[0043] Furthermore, in the fourth fixing assembly, the two fourth sliding seats 31 are driven by corresponding fourth cylinders 32 and move in opposite directions. Each fourth sliding seat 31 is provided with a twelfth pressing mechanism 33 on its top. The first abutting mechanism 34 penetrates the fourth mounting plate 30, and its cylinder drives the abutting plate to extend, cooperating with the thirteenth pressing mechanism 35, the fourteenth pressing mechanism 36 and the fifteenth pressing mechanisms 37 on both sides to complete the clamping of the core component of the leg support frame sub-assembly 7.

[0044] Furthermore, in the fifth fixing component, two support seats 38 are fixed to the surface of the fourth mounting plate 30. The sixteenth pressing mechanism 39 and the seventeenth pressing mechanism 40 on the top of the support seat cooperate with the second abutment mechanism 41 to achieve the positioning of the irregularly shaped parts. The second abutment mechanism 41 is fixedly inserted through the top of the fourth mounting plate 30, and the eighteenth pressing mechanism 42 is disposed on the side of the second abutment mechanism 41 to assist in fixing the parts.

[0045] Furthermore, the sixth fixing component consists of three nineteenth pressing mechanisms 43 and four twentieth pressing mechanisms 44, wherein adjacent nineteenth pressing mechanisms 43 are at a 90-degree angle to each other, and the first and last nineteenth pressing mechanisms 43 are on the same straight line, and the four twentieth pressing mechanisms 44 are arranged symmetrically in pairs to form a fully enclosed fixing structure for complex curved surface parts.

[0046] This application can be used in the field of seat manufacturing technology, or in other fields applicable to this application.

[0047] Example 2: Reference Figure 5 , 6 An improvement based on Example 1: a leg support frame welding fixture, which is applied to the field of seat manufacturing technology;

[0048] In this embodiment, the first to twentieth pressing mechanisms all employ the same lever-type pressing device: the piston rod of the drive cylinder 45 is fixedly connected to the rotating head 48, the rotating head 48 is hinged to the end of the pressing plate 49, the middle of the pressing plate 49 is hinged to the rotating bracket 47, and the other end of the rotating bracket 47 is hinged to the mounting base 46 fixedly installed on the top of the drive cylinder 45. When the piston rod of the drive cylinder 45 extends or retracts, the pressing plate 49 generates lever motion with the rotating bracket 47 as the fulcrum, which can achieve precise pressing or releasing of the parts to be welded.

[0049] In this embodiment, the first abutting mechanism 34 and the second abutting mechanism 41 have the same structure, both consisting of a cylinder and an abutting plate. Taking the first abutting mechanism 34 as an example, its cylinder body is fixedly inserted through the top of the fourth mounting plate 30, and one end of the piston rod can be fixedly connected to one side of the corresponding abutting plate. When the cylinder piston rod extends, the abutting plate can vertically press against the surface of the component, forming a rigid constraint with the surrounding pressing mechanism, which can effectively complete the fixing of the component and ensure good accuracy of subsequent welding.

[0050] However, as is well known to those skilled in the art, the working principles and wiring methods of the drive cylinder 45, multiple photoelectric switches and multiple cylinders are commonplace and are all conventional means or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0051] The working principle and usage process of this technical solution are as follows: When using the first welding fixture 4, the operator can place the required components for the left connecting rod-welding assembly 1 and the right connecting rod-welding assembly 2 onto the first mounting plates 9 of the two first fixtures respectively; in each first fixture, the piston rod of the first cylinder 11 extends, pushing the first sliding seat 10 to move towards the center along the guide rail of the first mounting plate 9; the first pressing mechanism 12 at the top of the first sliding seat 10 is activated simultaneously, and its driving cylinder 45 drives the pressing plate to perform lever movement, performing initial positioning of the components. The second pressing mechanism 13, the third pressing mechanism 14, the fourth pressing mechanism 15 and the fifth pressing mechanism 16 are activated in sequence. The third pressing mechanism 14, the fourth pressing mechanism 15 and the fifth pressing mechanism 16, which are triangularly distributed, apply pressure to the components from different directions, forming a three-dimensional spatial positioning with the first fixed component.

[0052] The second cylinder 19 of the second tooling drives the second sliding seat 18 to move, which in turn drives the sixth pressing mechanism 20 and the seventh pressing mechanism 21 to cooperate in clamping and fixing the components of the left connecting rod two welding assembly 3.

[0053] After all components are secured, welding is performed; once completed, each cylinder is reset and the clamps are released to allow the welded assembly to be removed.

[0054] When the second welding fixture 6 is in use, the operator can place the components of the extension leg support frame assembly 5 on the third mounting plate 22. The third cylinder 24 in the two sets of third fixing components drives the third sliding seat 23 to move, causing the positioning pin 25 to be inserted into the positioning hole of the corresponding component; the eighth pressing mechanism 26 and the tenth pressing mechanism 28 are started synchronously, and the pressing plate is driven by the driving cylinder 45 to press the component laterally. The four eleventh pressing mechanisms 29 apply vertical pressure to the components in adjacent areas respectively, and the ninth pressing mechanism 27 performs a covering pressing on the central component from the top.

[0055] After all components are fixed, welding is performed; once completed, each cylinder is reset and the clamps are released to allow the extension leg support frame assembly 5 to be removed.

[0056] When using the third welding fixture 8, the operator can place the components of the leg support frame sub-assembly 7 onto the fourth mounting plate 30. In the fourth fixing assembly, two fourth cylinders 32 drive the fourth sliding seat 31 to move towards the first abutting mechanism 34, and the twelfth pressing mechanism 33 clamps the components on both sides; the cylinder of the first abutting mechanism 34 pushes the abutting plate to extend, cooperating with the thirteenth pressing mechanism 35 and the fourteenth pressing mechanism 36 to complete axial positioning. The sixteenth pressing mechanism 39 and the seventeenth pressing mechanism 40 of the fifth fixing assembly vertically fix the components on the support seat 38, and the eighteenth pressing mechanism 42 and the second abutting mechanism 41 work together to achieve the pressing of the center node. The three nineteenth pressing mechanisms 43 of the sixth fixing assembly are distributed at ninety degrees, cooperating with four sets of twentieth pressing mechanisms 44 to perform multi-point pressing on the edge components.

[0057] After all components are fixed, welding is performed; once completed, each cylinder is reset and the clamps are released to allow the leg support frame sub-assembly 7 to be removed.

[0058] In this welding fixture, multiple pressing mechanisms operate on the same principle. Each mechanism extends and retracts its piston rod via a corresponding drive cylinder 45, causing the rotating head 48 and pressing plate to move around the fulcrum of the rotating bracket 47. When the drive cylinder 45 extends, one end of the pressing plate presses down to secure the component; when it retracts, the pressing plate lifts to release the clamped component. Simultaneously, the first abutting mechanism 34 and the second abutting mechanism 41, driven by cylinders, move their abutting plates linearly, forming complementary positioning with adjacent pressing mechanisms.

[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. A welding fixture for a leg support frame, characterized in that, include: The first welding fixture (4) includes two symmetrical first fixtures and second fixtures. The first fixture is provided with a first mounting plate (9), a first sliding seat (10), a first cylinder (11), a second pressing mechanism (13), a third pressing mechanism (14), a fourth pressing mechanism (15) and a fifth pressing mechanism (16). The second fixture is provided with a second mounting plate (17) and a second sliding seat (18). The second welding fixture (6) includes a third mounting plate (22), a third sliding seat (23), a positioning pin (25), an eighth pressing mechanism (26), a ninth pressing mechanism (27), a tenth pressing mechanism (28), and an eleventh pressing mechanism (29); The third welding fixture (8) includes a fourth mounting plate (30), a fourth sliding seat (31), a first abutting mechanism (34), a support seat (38), a nineteenth pressing mechanism (43), and a twentieth pressing mechanism (44). The first cylinder (11), the second cylinder (19), the third cylinder (24) and the fourth cylinder (32) drive the corresponding sliding seat to move respectively. Each pressing mechanism includes a driving cylinder (45), a rotating bracket (47) and a pressing plate (49). The driving cylinder (45) drives the pressing plate (49) to perform the lever pressing action through the rotating bracket (47).

2. The welding fixture for the leg support frame according to claim 1, characterized in that, In the first tooling, the third pressing mechanism (14), the fourth pressing mechanism (15) and the fifth pressing mechanism (16) are arranged in a triangular pattern and form a three-dimensional positioning structure with the first pressing mechanism (12) on the first sliding seat (10).

3. The welding fixture for the leg support frame according to claim 1, characterized in that, The second sliding seat (18) of the second tooling is provided with two sixth pressing mechanisms (20) on top, and the second mounting plate (17) is provided with two seventh pressing mechanisms (21). The sixth pressing mechanisms (20) and the seventh pressing mechanisms (21) are symmetrically distributed to clamp the workpiece.

4. The welding fixture for the leg support frame according to claim 1, characterized in that, The third sliding seat (23) of the second welding fixture (6) is horizontally fixed with a positioning pin (25). The eighth pressing mechanism (26) and the tenth pressing mechanism (28) are arranged on both sides of the third sliding seat (23), and the eleventh pressing mechanism (29) is distributed around the third sliding seat (23) to form a three-dimensional clamp.

5. The welding fixture for the leg support frame according to claim 1, characterized in that, The first abutting mechanism (34) of the third welding fixture (8) penetrates the fourth mounting plate (30). The thirteenth pressing mechanism (35) and the fourteenth pressing mechanism (36) are symmetrically arranged on both sides of the first abutting mechanism (34). The top of the fourth sliding seat (31) is provided with the twelfth pressing mechanism (33). The fourteenth pressing mechanism (36) is fixedly provided with the fifteenth pressing mechanism (37) on both sides by brackets to assist in the fixing of the corresponding parts.

6. The welding fixture for the leg support frame according to claim 5, characterized in that, The support base (38) of the third welding fixture (8) is provided with a sixteenth pressing mechanism (39) and a seventeenth pressing mechanism (40) on the top. The second abutting mechanism (41) and the eighteenth pressing mechanism (42) cooperate to form a center node pressing structure.

7. The welding fixture for the leg support frame according to claim 1, characterized in that, The piston rod of the driving cylinder (45) of the pressing mechanism is connected to the rotating head (48). One end of the pressing plate (49) is hinged to the rotating head (48), and the other end is hinged to the mounting seat (46) fixedly installed on the top of the driving cylinder (45) through the rotating bracket (47). When the driving cylinder (45) extends and retracts, the pressing plate (49) moves around the rotating bracket (47) in a lever motion.

8. The welding fixture for the leg support frame according to claim 1, characterized in that, The first abutting mechanism (34) and the second abutting mechanism (41) both include a cylinder and an abutting plate. The cylinder drives the abutting plate to move linearly to form complementary positioning.

9. The welding fixture for the leg support frame according to any one of claims 1-8, characterized in that, The first mounting plate (9), the second mounting plate (17), the third mounting plate (22) and the fourth mounting plate (30) are all provided with support legs at the bottom and photoelectric switches at the top to control the action of each cylinder.

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