An automatic welding tool for long sheet metal parts of a vehicle
By designing an automatic welding fixture with a flip-up support frame and limiting components, the problem of poor adaptability of the support seat was solved, enabling rapid switching of various types of long sheet metal parts and stable support during the welding process, thereby improving welding efficiency and precision.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAMEN BOZI IND & TRADE CO LTD
- Filing Date
- 2026-04-30
- Publication Date
- 2026-06-26
AI Technical Summary
In the existing technology, the support base for long sheet metal parts of vehicles has poor adaptability, resulting in low welding efficiency and the need to frequently replace the support base to adapt to different types of sheet metal parts.
An automatic welding fixture was designed, which includes a flip-up support frame and two mounting surfaces. The support frame is positioned before and after flipping by a positioning component, and different limiting components are installed on the two mounting surfaces to achieve support and limiting of long sheet metal parts of different types or specifications. Combined with the linkage between the three-axis robotic arm and the sliding support seat, real-time moving support is achieved during the welding process.
It improves the versatility and changeover efficiency of tooling, reduces welding deformation, enhances welding accuracy and efficiency, and adapts to various welding needs.
Smart Images
Figure CN122274531A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of welding equipment, and in particular to an automatic welding fixture for long sheet metal parts of vehicles. Background Technology
[0002] In automobile manufacturing, especially for large vehicles such as buses, coaches, and public buses, long sheet metal parts are required for the body. When welding long sheet metal parts, they are usually placed on rigid support seats. However, the support seats are usually only suitable for a single type of long sheet metal part, which has poor adaptability. When other types of sheet metal parts need to be welded, the entire support seat needs to be replaced, resulting in low efficiency of welding for different types. Summary of the Invention
[0003] To improve the adaptability of welding, this application provides an automatic welding fixture for long sheet metal parts of vehicles.
[0004] This application provides an automatic welding fixture for long sheet metal parts of vehicles, employing the following technical solution: An automated welding fixture for long sheet metal parts of vehicles includes: a welding device and a support device, the support device being located on one side of the welding device; the support device includes... Main frame; The support frame is rotatably connected to the main frame for flipping, with the two opposite sides being the first mounting surface and the second mounting surface, respectively. Positioning components, installed on the main frame, are used to position the support frame before and after flipping. A first limiting component, mounted on a first mounting surface, is used to support the workpiece to be welded; and The second limiting component is installed on the second mounting surface and is used to support the workpiece to be welded.
[0005] By adopting the above technical solution, the support frame is rotatably connected to the main frame, and the support frame before and after flipping is positioned by the positioning component, so that the first mounting surface and the second mounting surface can be switched according to actual needs, and the first limiting component and the second limiting component are installed respectively, thereby realizing the support and limiting of long sheet metal parts of different types or specifications without replacing the entire support device, improving the versatility and changeover efficiency of the tooling, and adapting to various welding needs.
[0006] Optionally, the first limiting component includes at least two supporting limiting seats, which are disposed on the first mounting surface and spaced apart along a straight direction, and are used to support the workpiece to be welded.
[0007] By adopting the above technical solution, the first limiting component includes at least two support limiting seats that are spaced apart along a straight line, which can provide multi-point support for long sheet metal parts and keep them stable during the welding process.
[0008] Optionally, the welding device includes a base, a three-axis robotic arm, and a welding assembly; the three-axis robotic arm is mounted on the base, and the welding assembly includes a welding torch detachably mounted on the three-axis robotic arm.
[0009] By adopting the above technical solutions, the three-axis robotic arm can precisely control the movement of the welding torch in three-dimensional space, realize the automated welding of long sheet metal parts, improve welding efficiency and quality, and the detachable design of the welding torch facilitates maintenance and replacement, adapting to different welding process requirements.
[0010] Optionally, the first limiting component includes a slide rail, and a first support, a sliding support, and a tail support that are sequentially distributed along the length of the slide rail and used to support the workpiece to be welded; the slide rail is mounted on a first mounting surface, and the first support and the tail support are both adjustablely mounted on the slide rail along the length of the slide rail; the sliding support slides on the slide rail along the length of the slide rail. The sliding support has a push seat, and the three-axis robotic arm has a push seat. When the three-axis robotic arm moves along the length of the parallel slide rail, the push seat abuts against the push seat to push the sliding support to move together, so that the sliding support is opposite to the welding torch to support the welding point.
[0011] By adopting the above technical solution, the sliding support seat, through the cooperation of the push seat and the push seat on the three-axis robotic arm, can move synchronously with the welding torch during the welding process, providing real-time support for the welding joint, effectively reducing the deformation of long sheet metal parts during the welding process, and improving welding accuracy and product quality.
[0012] Optionally, the push seat is hinged to the sliding support seat, and the push seat has an upright state and a downward swing state; the welding direction is from the first support seat to the tail support seat. When the push seat is in the upright state, the push seat can push the push seat when it moves along the welding direction; when the push seat is in the downward swing state, the push seat can pass through the push seat when it moves along the welding direction. The sliding support is provided with a locking element for cooperating with the pushed seat, which keeps the pushed seat in an upright state; the tail support is provided with an unlocking element for cooperating with the locking element. When the sliding support approaches the tail support, the unlocking element can unlock the locking element, so that when the pusher moves towards the tail support, it pushes the pushed seat to the lowered state and passes by the pushed seat.
[0013] By adopting the above technical solution, the push seat has an upright state and a downward swing state, and the state switching is achieved through the cooperation of the locking and unlocking parts, so that the sliding support seat can automatically disengage from the push seat when it approaches the tail support seat, making it easier for the welding torch to continue moving to complete the subsequent welding.
[0014] Optionally, the locking member moves on the sliding support, the push seat has a locking hole for the locking member to be inserted, the push seat is in an upright state when the locking member is inserted into the locking hole, and the locking member has a through hole extending in the direction of insertion into the locking hole; The unlocking component has an inclined unlocking surface. When the sliding support seat approaches the tail support seat, the unlocking component is inserted into the through hole and the unlocking surface abuts against the inner wall of the end of the through hole away from the push seat. As the sliding support seat moves towards the tail support seat, the unlocking surface moves the locking component away from the push seat to unlock it.
[0015] By adopting the above technical solution, the locking and unlocking components can automatically unlock through the cooperation of the through hole and the unlocking surface.
[0016] Optionally, a reset element is provided between the push seat and the sliding support seat, which gives the push seat a tendency to return to the upright position.
[0017] Optionally, a limit switch is provided on the sliding support base. The limit switch is electrically connected to the counter. When the pushed base moves to the swing-down state, the limit switch is triggered, causing the counter to count once.
[0018] By adopting the above technical solution, the limit switch is electrically connected to the counter, which can automatically count when the pushed seat swings down, record the number of welding operations or progress in real time, facilitate production management and quality traceability, and improve the informatization level of the welding process.
[0019] Optionally, the output end of the three-axis robotic arm has a mounting base, on which a rotation source is provided. The axis of the output end of the rotation source extends vertically, and a mounting bracket for mounting a welding torch is provided on the output end of the rotation source.
[0020] By adopting the above technical solution, the setting of the rotating source and the mounting clamp enables the welding torch to be adjusted at multiple angles, adapting to the welding needs of long sheet metal parts of different shapes and positions, and enhancing the flexibility and adaptability of the welding device.
[0021] Optionally, the three-axis robotic arm is equipped with hooks for hanging welding torches.
[0022] In summary, this application includes at least one of the following beneficial effects: 1. By setting a flip-up support frame and different limit components on the two mounting surfaces, it is possible to quickly switch between supports for various types of long sheet metal parts, thereby improving the versatility and changeover efficiency of the tooling; 2. Through the linkage design of the sliding support base and the three-axis robotic arm, real-time moving support of the welding point is realized during the welding process, which effectively reduces welding deformation and improves welding accuracy. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application; Figure 2 This is a schematic diagram of the support device in Embodiment 1 of this application; Figure 3 yes Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the welding apparatus in Embodiment 1 of this application; Figure 5 This is a schematic diagram of the structure of Embodiment 2 of this application; Figure 6 This is a schematic diagram of the support device in Embodiment 2 of this application; Figure 7 This is a schematic diagram of the sliding support base in Embodiment 2 of this application; Figure 8 This is a schematic diagram of the explosive structure between the locking member and the pushed seat in Embodiment 2 of this application; Figure 9 This is a schematic diagram of the tail support in Embodiment 2 of this application.
[0024] Explanation of reference numerals in the attached drawings: 1. Welding device; 11. Base; 12. Three-axis robotic arm; 13. Welding assembly; 131. Welding torch; 132. Wire feeder; 2. Support device; 21. Main frame; 22. Support frame; 23. Positioning component; 24. First limiting component; 241. Support limiting seat; 242. Slide rail; 243. First support seat; 244. Sliding support seat; 245. Tail support seat; 25. Second limiting component; 4. First mounting surface; 5. Second mounting surface; 6. Push seat; 7. Push seat; 8. Locking component; 9. Unlocking component; 10. Lock hole; 14. Through hole; 15. Unlocking surface; 16. Limit switch; 17. Mounting clamp; 18. Hook; 19. Insertion hole; 20. Support part; 26. Mating groove; 27. Adjustment hole; 28. Boss; 29. Rotation source. Detailed Implementation
[0025] The following is in conjunction with the appendix Figure 1 To be continued Figure 9 This application will be described in further detail.
[0026] Example 1:
[0027] This application discloses an automatic welding fixture for long sheet metal parts of vehicles. (Refer to...) Figure 1 An automatic welding fixture for long sheet metal parts of vehicles includes a welding device 1 and a support device 2, with the support device 2 located on one side of the welding device 1. The support device 2 and the welding device 1 work together; the support device 2 provides support and limits for the long sheet metal part to be welded, while the welding device 1 performs automatic welding on the long sheet metal part. This synergy improves the efficiency and quality of welding long sheet metal parts.
[0028] Reference Figure 1 and Figure 2 Specifically, the support device 2 includes a main frame 21, a support frame 22, a positioning component 23, a first limiting component 24, and a second limiting component 25. The main frame 21 is the basic structure of the entire support device 2, providing a platform for the installation and support of other components. The main frame 21 is usually made of high-strength metal materials, such as steel, and its structure can be frame-type, with good stability and load-bearing capacity.
[0029] The support frame 22 is rotatably connected to the main frame 21 for flipping, with the first mounting surface 4 and the second mounting surface 5 on opposite sides. The support frame 22 can be made of aluminum alloy to reduce the overall weight while ensuring a certain level of strength. The support frame 22 is connected to the main frame 21 through rotating components such as bearings, allowing the support frame 22 to flip flexibly, and the axis of rotation of the support frame 22 extends horizontally.
[0030] Reference Figure 2 and Figure 3 The positioning element 23 is installed on the main frame 21 and is used to position the support frame 22 before and after flipping. The positioning element 23 can be a positioning pin or a positioning block. When the support frame 22 is flipped to the appropriate position, the positioning element 23 can fix it to ensure the accurate position of the support frame 22. Preferably, in this embodiment, both sides of one end of the support frame 22 are provided with insertion holes 19. The positioning element 23 is set as a push-pull type installed on the main frame 21. Push-pull type clamps corresponding to the insertion holes 19 are installed on both sides of the main frame 21. The push-pull type clamps drive the pressure head to move back and forth by swinging the push-pull handle. When the pressure head moves forward, it is inserted into the corresponding insertion hole 19 to position the support frame 22. When the pressure head moves backward, it leaves the insertion hole 19. At this time, the support frame 22 can be flipped 180°.
[0031] The first limiting component 24 is installed on the first mounting surface 4, and the second limiting component 25 is installed on the second mounting surface 5. Both the first limiting component 24 and the second limiting component 25 are used to support and limit the long sheet metal parts. The first limiting component 24 and the second limiting component 25 can be components of the same type but different models, or they can be components of different types. The first limiting component 24 and the second limiting component 25 can be set according to the requirements so that the support device 2 can support at least two different models of long sheet metal parts.
[0032] Specifically, in this embodiment, the first limiting component 24 includes at least two supporting limiting seats 241. In this embodiment, the number of supporting limiting seats 241 is specifically two, but in other embodiments, it can also be three, four, etc. The supporting limiting seats 241 are installed on the first mounting surface 4 and are spaced apart along the straight direction of the welding of the long sheet metal parts. The supporting limiting seats 241 have a supporting part 20, and the supporting part 20 forms a mating groove 26 for the long sheet metal parts to abut. When the long sheet metal parts are welded, they are placed on two supporting limiting seats 241 at the same time. The long sheet metal parts can limit the relative displacement between themselves and the supporting limiting seats 241 by their own weight, or a clamp 17 (not shown in the figure) can be installed on the supporting limiting seats 241 to clamp the long sheet metal parts and limit the movement of the supporting limiting seats 241.
[0033] The second limiting component 25 is mounted on the second mounting surface 5 and is used to support the workpiece to be welded. The second limiting component 25 can be a clamp or similar to the first limiting component 24. By flipping the support frame 22, the first limiting component 24 and the second limiting component 25 can be easily switched, thereby adapting to different models and types of long sheet metal parts and improving the versatility of the tooling.
[0034] Reference Figure 1 and Figure 4 The welding device 1 includes a base 11, a three-axis robotic arm 12, and a welding assembly 13. The base 11 serves as the foundation of the welding device 1, providing support and a mounting platform for the three-axis robotic arm 12 and the welding assembly 13. The three-axis robotic arm 12 is mounted on the base 11 and can adjust the position of its output end in the X, Y, and Z directions, where the X direction is the welding movement direction and is parallel to the distribution direction of the support limit seats 241. The three-axis robotic arm 12 is electrically driven, achieving precise movement control through a motor and transmission mechanism.
[0035] The welding assembly 13 includes a welding torch 131 and a wire feeder 132. The wire feeder 132 is mounted on the base of the three-axis robotic arm 12 and moves along the X-direction with the three-axis robotic arm 12. The welding torch 131 cooperates with the wire feeder 132 through a wire guide tube, allowing the wire feeder 132 to supply welding material to the welding torch 131. Simultaneously, the welding torch 131 is detachably mounted on the output end of the three-axis robotic arm 12, and the three-axis robotic arm 12 drives the welding torch 131 to perform automatic welding.
[0036] Furthermore, a mounting base is fixedly installed at the output end of the three-axis robotic arm 12. A rotation source 29 is mounted on the mounting base. The rotation source 29 is a forward and reverse reversible motor. The output end of the rotation source 29 is rod-shaped and extends vertically downward. A mounting clamp 17 for mounting the welding torch 131 is mounted on the output end of the rotation source 29. In this embodiment, the mounting clamp 17 is preferably a multi-functional clamp with a disc. The end of the multi-functional clamp with a disc for holding the welding torch 131 can rotate relative to the end for mounting to the output end of the rotation source 29, and the rotation axis is perpendicular to the rotation axis of the output end of the rotation source 29, so that the position of the welding torch 131 can be adjusted at multiple angles, so that the welding torch 131 can adapt to the welding requirements of long sheet metal parts of different specifications.
[0037] Among them, the three-axis robotic arm 12, the welding assembly 13, and the structure of the multi-functional clamp with a disc are common existing technologies, and will not be described in detail here.
[0038] Furthermore, the three-axis robotic arm 12 is equipped with a hook 18 for hanging the welding torch 131. The hook 18 can conveniently hang the welding torch 131. When the welding torch 131 is not in use, it can be hung on the hook 18 to prevent damage caused by careless placement. It also facilitates the retrieval and management of the welding torch 131.
[0039] The implementation principle of an automatic welding fixture for long sheet metal parts of vehicles according to an embodiment of this application is as follows: the support frame 22 can be rotated around the main frame 21 and fixed by the positioning component 23, so that the first mounting surface 4 or the second mounting surface 5 faces upward, and different types of first limiting components 24 or second limiting components 25 are installed respectively to adapt to different models of long sheet metal parts. During welding, the long sheet metal part is placed on the corresponding limiting component, and the three-axis robotic arm 12 drives the welding gun 131 to move along the welding direction for automatic welding.
[0040] Example 2:
[0041] The difference between this embodiment and the above embodiment lies in the structure of the first limiting component 24.
[0042] Reference Figure 5 and Figure 6In this embodiment, the first limiting component 24 includes a slide rail 242, a first support 243, a sliding support 244, and a tail support 245. Similar to the limiting support in the above embodiment, the first support 243, the sliding support 244, and the tail support 245 also have supporting portions 20 for supporting and limiting the long sheet metal part. The supporting portions 20 of the first support 243 and the tail support 245 have rough surfaces, while the supporting portion 20 of the sliding support 244 has a smooth surface. The first support 243, the sliding support 244, and the tail support 245 are distributed sequentially along the length direction of the slide rail 242. The length direction of the slide rail 242 is parallel to the welding direction, which is from the first support 243 towards the tail support 245.
[0043] The slide rail 242 is fixedly installed on the first mounting surface 4. The slide rail 242 has multiple adjustment holes 27 evenly spaced along its length. The first support seat 243 and the tail support seat 245 are both inserted into the adjustment holes 27 by bolts or pins to lock them onto the slide rail 242. The first support seat 243 and the tail support seat 245 can adjust their positions on the slide rail 242 by cooperating with different adjustment holes 27, so that the first support seat 243 and the tail support seat 245 can be adjusted and installed on the slide rail 242 along the length of the slide rail 242. Thus, the distance between the first support seat 243 and the tail support seat 245 can be adjusted according to the length of the long sheet metal part.
[0044] The sliding support 244 slides along the length of the slide rail 242. The sliding support 244 has a pusher seat 6, and the output end of the three-axis robotic arm 12 has a pusher seat 7. When the three-axis robotic arm 12 moves along the welding direction, the pusher seat 7 abuts against the pusher seat 6 to push the sliding support 244 to move together, so that the sliding support 244 is opposite to the welding torch 131. This allows the sliding support 244 to support the welding joint of the long sheet metal part, thereby reducing deformation of the long sheet metal part during welding.
[0045] Reference Figure 6 and Figure 7 More specifically, the push-receiving seat 6 is plate-shaped and hinged at the bottom to the sliding support seat 244. The push-receiving seat 6 has an upright state and a downward swinging state. When the push-receiving seat 6 is in the upright state, it extends vertically. When the push-receiving seat 6 is in the downward swinging state, it swings downward toward the tail support seat 245. The sliding support seat 244 is provided with a locking member 8, which is used to lock the push-receiving seat 6 in the upright state. The tail support seat 245 is provided with an unlocking member 9, which unlocks the locking member 8.
[0046] Reference Figure 5 to Figure 7The welding process is as follows: the push seat 6 is initially locked in an upright position by the locking member 8, while the sliding support seat 244 abuts against or approaches the first support seat 243. Then, the long sheet metal part to be welded is placed simultaneously on the support portion 20 of the first support seat 243, the tail support seat 245, and the sliding support seat 244. Subsequently, the three-axis robotic arm 12 and the welding assembly 13 are activated, causing the welding torch 131 to move from the first support seat 243 to the tail support seat 245 for welding. During the welding process, when the welding torch 131 reaches the position opposite to the sliding support seat 244, the push seat 7 abuts against the side of the push seat 6 near the first support seat 243, causing the sliding support seat 244 to move together towards the tail support seat 245 under the push of the push seat 7. When the sliding support 244 moves close to the tail support 245, the unlocking component 9 unlocks the locking component 8, allowing the welding torch 131 to continue moving forward to weld the tail of the long sheet metal part. During this process, the pushed seat 6 is gradually pushed to the lowered position by the pushed seat 7, and the pushed seat 7 gradually passes the pushed seat 6, so that the pushed seat 6 does not affect the movement of the three-axis robotic arm 12.
[0047] Reference Figure 7 and Figure 8 The sliding support 244 has a boss 28. The locking member 8 is a square rod with a pointed front end, which slides along the axial direction parallel to the hinge axis of the push seat 6 and passes through the boss 28. The side wall of the push seat 6 has a locking hole 10 for the locking member 8 to be inserted. When the locking member 8 moves closer to the push seat 6 and is inserted into the locking hole 10, the pointed end and part of the square rod of the locking member 8 are inserted into the locking hole 10, keeping the push seat 6 in an upright state. The locking member 8 has a through hole 14 that passes through the opposite sides of the locking member 8 and extends along the length of the locking member 8. After the locking member 8 is inserted into the locking hole 10, the end of the through hole 14 away from the push seat 6 is still exposed. In addition, in some embodiments, the locking member 8 can be magnetically attracted into the locking hole 10 to improve the stability of the locking member 8.
[0048] Reference Figure 6 , Figure 7 and Figure 9 The unlocking element 9 is fixed to the tail support 245 via a connecting rod. The unlocking element 9 is a right-angled triangle with its pointed end facing the sliding support 244, and the inclined surface is the unlocking surface 15. When the sliding support 244 approaches the tail support 245, the unlocking element 9 is inserted into the insertion through hole 14, and the unlocking surface 15 abuts against the inner wall of the end of the through hole 14 away from the push seat 6. As the sliding support 244 continues to move closer to the tail support 245, the unlocking surface 15 pushes the locking element 8 away from the push seat 6, gradually unlocking the locking element 8's push lock hole 10. The unlocking is completed before the sliding support 244 abuts against the tail support 245.
[0049] Reference Figure 7Furthermore, a limit switch 16 is installed on the sliding support 244. The limit switch 16 is electrically connected to the counter. The limit switch 16 has a rocker arm, and the rocker arm of the limit switch 16 is located in the path of the downward swing of the pushed seat 6. When the pushed seat 6 moves to the downward swing state, it simultaneously pushes the limit switch 16 to trigger the counter to count once. This allows for the counting of welding operations or the recording of welding progress. The limit switch 16 is a common existing technology and will not be described in detail here.
[0050] Furthermore, in some embodiments, a reset member (not shown in the figure) is provided between the pushed seat 6 and the sliding support 244, which gives the pushed seat 6 a tendency to return to an upright position. The reset member can be a spring or a torsion spring. After the push seat 7 passes the pushed seat 6, the pushed seat 6 can automatically return to a near-vertical position under the action of the reset member.
[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. An automatic welding fixture for long sheet metal parts of vehicles, characterized in that, include: Welding device (1) and support device (2), the support device (2) is located on one side of welding device (1); The support device (2) includes Main frame (21); The support frame (22) is rotatably connected to the main frame (21) for flipping, and the two opposite sides are the first mounting surface (4) and the second mounting surface (5). Positioning component (23) is installed on the main frame (21) and is used to position the support frame (22) before and after flipping. The first limiting component (24) is mounted on the first mounting surface (4) and is used to support the workpiece to be welded; and The second limiting component (25) is installed on the second mounting surface (5) and is used to support the workpiece to be welded.
2. The automatic welding fixture for long sheet metal parts of vehicles according to claim 1, characterized in that: The first limiting component (24) includes at least two supporting limiting seats (241), which are disposed on the first mounting surface (4) and distributed at intervals along a straight line. The supporting limiting seats (241) are used to support the workpiece to be welded.
3. The automatic welding fixture for long sheet metal parts of vehicles according to claim 1, characterized in that: The welding device (1) includes a base (11), a three-axis robotic arm (12), and a welding assembly (13); the three-axis robotic arm (12) is mounted on the base (11), and the welding assembly (13) includes a welding torch (131) that is detachably mounted on the three-axis robotic arm (12).
4. An automatic welding fixture for long sheet metal parts of vehicles according to claim 3, characterized in that: The first limiting component (24) includes a slide rail (242), and a first support seat (243), a sliding support seat (244), and a tail support seat (245) arranged sequentially along the length of the slide rail (242) for supporting the workpiece to be welded; the slide rail (242) is mounted on the first mounting surface (4), and the first support seat (243) and the tail support seat (245) are both adjustablely mounted on the slide rail (242) along the length of the slide rail (242); the sliding support seat (244) slides on the slide rail (242) along the length of the slide rail (242); The sliding support (244) has a push seat (6), and the three-axis robotic arm (12) has a push seat (7). When the three-axis robotic arm (12) moves along the length of the parallel slide rail (242), it pushes the sliding support (244) to move together by contacting the push seat (6) with the push seat (7), so that the sliding support (244) is opposite to the welding torch (131) to support the welding point.
5. An automatic welding fixture for long sheet metal parts of vehicles according to claim 4, characterized in that: The push seat (6) is hinged to the sliding support seat (244), and the push seat (6) has an upright state and a downward swing state; the welding direction is from the first support seat (243) towards the tail support seat (245). When the push seat (6) is in the upright state, the push seat (7) can push the push seat (6) when it moves along the welding direction; when the push seat (6) is in the downward swing state, the push seat (7) can pass through the push seat (6) when it moves along the welding direction. The sliding support (244) is provided with a locking member (8) for cooperating with the pushed seat (6), and the locking member (8) keeps the pushed seat (6) in an upright state; the tail support (245) is provided with an unlocking member (9) for cooperating with the locking member (8). When the sliding support (244) approaches the tail support (245), the unlocking member (9) can unlock the locking member (8), so that when the push seat (7) moves towards the tail support (245), it pushes the pushed seat (6) to a downward swing state and passes through the pushed seat (6).
6. An automatic welding fixture for long sheet metal parts of vehicles according to claim 5, characterized in that: The locking member (8) moves on the sliding support (244), the push seat (6) has a lock hole (10) for the locking member (8) to be inserted, the push seat (6) is in an upright state when the locking member (8) is inserted into the lock hole (10), and the locking member (8) has a through hole (14) extending in the direction of insertion into the lock hole (10). The unlocking component (9) has an inclined unlocking surface (15). When the sliding support (244) approaches the tail support (245), the unlocking component (9) is inserted into the through hole (14) and the unlocking surface (15) abuts against the inner wall of the end of the through hole (14) away from the push seat (6). During the movement of the sliding support (244) towards the tail support (245), the unlocking surface (15) moves the locking component (8) away from the push seat (6) to unlock it.
7. An automatic welding fixture for long sheet metal parts of vehicles according to claim 5, characterized in that: A reset member is provided between the push seat (6) and the sliding support seat (244), which gives the push seat (6) a tendency to reset to the upright state.
8. An automatic welding fixture for long sheet metal parts of vehicles according to claim 5, characterized in that: A limit switch (16) is provided on the sliding support (244). The limit switch (16) is electrically connected to the counter. When the pushed seat (6) moves to the swing state, the limit switch (16) is triggered, causing the counter to count once.
9. An automatic welding fixture for long sheet metal parts of vehicles according to claim 3, characterized in that: The output end of the three-axis robotic arm (12) has a mounting base, on which a rotation source (29) is provided. The axis of the output end of the rotation source (29) extends vertically, and a mounting clip (17) for mounting a welding torch (131) is provided on the output end of the rotation source (29).
10. An automatic welding fixture for long sheet metal parts of vehicles according to claim 3, characterized in that: The three-axis robotic arm (12) is equipped with a hook (18) for hanging a welding torch (131).