Plasma arc welding equipment for straight seam welding of frame

Abstract

The invention discloses plasma arc welding equipment for frame straight seam welding, and relates to the technical field of plasma arc straight seam welding equipment.The plasma arc welding equipment comprises a rack installed on the upper surface of a machine base through bolts, and the side face, located below the rack, of the machine base is connected with a working rack for bearing a frame through bolts. According to the plasma arc welding equipment for frame straight seam welding, the end portions of the two frame workpieces are precisely bulldozed and aligned through the aligning mechanism, the initial assembly error is eliminated, rigid clamping is formed on the two sides of the frame workpieces through the clamping mechanism, the welding faces of the frame workpieces are forced to be tightly attached, and the welding efficiency is improved. The aligning mechanism, the clamping mechanism and the original pressing assembly form three-dimensional multi-point constraint on the frame workpiece, workpiece upwarp, transverse shrinkage and distortion caused by welding thermal stress are effectively resisted, finally, the clamping mechanism is in linkage with the top disc to operate, adsorption of the frame workpiece and the working table top is broken, quick and lossless workpiece taking is facilitated, and the welding quality is improved. And deformation of the frame workpiece is avoided.

Description

A plasma arc welding device for straight seam welding of vehicle frames Technical Field

[0001] This invention relates to the field of plasma arc straight seam welding equipment technology, specifically to a plasma arc welding equipment for straight seam welding of vehicle frames. Background Technology

[0002] In the automobile production process, plasma arc welding equipment is often used to perform straight seam welding on the vehicle frame. Plasma arc welding equipment is a high-efficiency and precision welding equipment. The vehicle frame usually contains thin plate structures. Plasma arc welding equipment can generate a small welding heat-affected zone, which can meet the welding requirements of thin plates. The equipment uses a high-temperature, high-energy-density plasma arc as a heat source. During the welding process, the plasma arc can stably penetrate the workpiece to achieve one-time penetration and high weld quality.

[0003] Referring to existing patent CN221791511U, a special machine for welding straight seams of thin plates includes a frame, which includes two parallel vertical supports and a crossbeam set at the top of the two vertical supports; a lifting mechanism, which is set on the frame, and a welding mechanism, on which a welding torch is movably mounted; and a clamping mechanism, which includes an upper clamping member and a lower clamping member, the upper clamping member being set at the bottom of the lifting mechanism and the lower clamping member being set directly below the lifting mechanism, the upper and lower clamping members being used to clamp the thin plate. The thin plate straight seam welding machine provided by this solution has a compact structure, is easy to operate, reduces the workload of operators, increases production efficiency, and reduces resource consumption; at the same time, the position and angle of the welding torch can be freely adjusted, and combined with the lifting platform, it can be used for welding different types of thin plates;

[0004] According to existing patents, plasma arc welding devices used for straight seam welding of vehicle frames typically employ upper and lower clamping to prevent displacement of the vehicle frame workpiece during welding. However, due to the thermal stress generated during welding, the vehicle frame workpiece undergoes not only longitudinal deformation but also lateral deformation during the welding process, and misalignment is prone to occur at the ends of the two vehicle frame workpieces. Furthermore, after welding, the vehicle frame workpiece often adheres to the worktable surface due to cooling contraction, micro-fusion, or vacuum adsorption, making it difficult to remove and easily causing workpiece damage. The aforementioned problems of single clamping point, inaccurate end alignment, and post-weld adhesion can easily lead to welding deformation and unstable fusion quality of the vehicle frame workpiece. Therefore, this solution proposes a plasma arc welding device for straight seam welding of vehicle frames. Summary of the Invention

[0005] The purpose of this invention is to provide a plasma arc welding device for straight seam welding of vehicle frames, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a plasma arc welding device for straight seam welding of vehicle frames, comprising a frame bolted to the upper surface of a base, a workbench supporting the vehicle frame being bolted to the side of the base below the frame, and an extension table being fixed to the end of the workbench away from the base;

[0007] Both sides of the workbench are equipped with clamping mechanisms to make the vehicle frame workpieces fit tightly together. The clamping mechanism includes clamping plates located on both sides of the workbench to press the outer side of the vehicle frame workpiece. The inner side of the clamping plate is movably sleeved with a first connecting rod and a second connecting rod distributed vertically. One end of the first connecting rod is provided with a drive plate and a top plate with one side edge being straight and the other side edge being convex.

[0008] The upper surfaces of both the extension table and the workbench are equipped with auxiliary mechanisms for aligning the ends of the vehicle frame workpieces. The auxiliary mechanism includes a second rotating seat fixed to the surfaces of the extension table and the workbench. An alignment plate for flipping and aligning the ends of the vehicle frame workpieces is movably sleeved on the inner side of the second rotating seat. Both ends of the alignment plate are fixed with elastic support mechanisms for supporting the tilted vehicle frame workpieces. The elastic support mechanism includes a pressure plate located at the corner of the vehicle frame workpiece.

[0009] Furthermore, a clamping assembly for positioning the top of the vehicle frame workpiece is installed below the top of the workbench frame on the frame, and a support plate for supporting the vehicle frame workpiece is bolted to the center of the workbench frame near the clamping assembly.

[0010] A second mounting plate and a fixing bracket are fixed on the outer side wall of the workbench, and a first mounting plate is installed at the bottom opening of the workbench by bolts.

[0011] Furthermore, the clamping mechanism is connected to the fixed frame and extends into the inner cavity of the workbench frame, and the auxiliary mechanism is connected to the second mounting plate.

[0012] Furthermore, a linear drive assembly for driving the welding control assembly to move laterally is mounted on the surface of the frame, and the welding control assembly is mounted on the outside of the linear drive assembly. A monitoring assembly for monitoring the welding operation is mounted on the surface of the frame near the welding control assembly, and a control panel is mounted on the side of the frame near the monitoring assembly.

[0013] Furthermore, both the first and second connecting rods are connected to the fixed frame via bearings, and a lifting plate is provided in the inner cavity of the workbench frame;

[0014] The workbench frame is fixed with a guide rail frame for the lifting plate to slide up and down on the inner side near the lifting plate. Both ends of the lifting plate are provided with strip grooves for the end of the second connecting rod to slide. A cylinder for driving the lifting plate to rise and fall is installed below the first mounting plate by bolts.

[0015] Furthermore, the end of the first connecting rod connected to the fixed frame is fixedly connected to the drive disk. One side of the drive disk is provided with a toothed block, and one side of the toothed block is meshed with a rack. The top disk and one end of the rack form an integral structure.

[0016] Furthermore, the inner side of the top plate is provided with an eccentrically connected bearing assembly, which includes a shaft and a fixed seat. The fixed seat is connected to the outer wall of the workbench, the shaft is connected to the top plate, and the shaft and the fixed seat are connected by a bearing.

[0017] Furthermore, a swing arm is fixedly connected to the end of the alignment plate, and an electric push rod is connected to one side of the swing arm and the second mounting plate via a hinge.

[0018] Furthermore, one end of the pressure plate is movably connected to a rotating seat, and a connecting block is fixed on the side of the rotating seat away from the pressure plate, and the connecting block is connected to both ends of the alignment plate.

[0019] Furthermore, a sliding rod is fixed in the inner cavity of the connecting block, and a slider and a support spring that provides elastic support to the slider are slidably sleeved on the outer side of the sliding rod.

[0020] The slider and the pressure plate are connected by a hinge, and a No. 3 connecting rod that supports the pressure plate is connected.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This plasma arc welding equipment for straight seam welding of vehicle frames uses an alignment mechanism to precisely flatten and align the ends of two vehicle frame workpieces, eliminating initial assembly errors. A clamping mechanism forms a rigid clamp on both sides of the vehicle frame workpieces, forcing their welding surfaces to fit tightly together. The alignment mechanism, clamping mechanism, and original pressing components form a three-dimensional multi-point constraint on the vehicle frame workpieces, effectively resisting the upward warping, lateral shrinkage, and torsional deformation of the workpieces caused by welding thermal stress. Finally, the clamping mechanism is linked to the top plate to break the adhesion between the vehicle frame workpieces and the worktable, facilitating quick and non-destructive removal of the parts, avoiding deformation of the vehicle frame workpieces, and improving the fusion quality.

[0023] 2. This plasma arc welding equipment for straight seam welding of vehicle frames stands upright as a stop during welding and clamping, and completely clears space when removing parts after welding, providing unobstructed vertical operating space for workers or robotic arms to remove parts, thus solving the problem that fixed stops would interfere with material removal;

[0024] 3. This plasma arc welding equipment for straight seam welding of vehicle frames features an elastic support mechanism that ensures the pressure plate always rests against one side of the vehicle frame workpiece, providing elastic support for tilted workpieces. This facilitates cooperation with the top plate, assists in removing the vehicle frame workpiece from the worktable, and allows for elastic displacement of the contact position between the pressure plate and the workpiece, without hindering the alignment operation of the alignment plate. It can accommodate vehicle frame workpieces of different widths, providing a certain support distance for the workpiece. Furthermore, the elastic support mechanism is located at the four corners of the workpiece and works in conjunction with multiple clamping structures to effectively solve the problem of welding misalignment. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 is a schematic diagram of the base structure of the present invention;

[0027] Figure 3 is a schematic diagram of the frame structure of the present invention;

[0028] Figure 4 is a schematic diagram of the workbench structure of the present invention;

[0029] Figure 5 is a schematic diagram of the welding control assembly of the present invention;

[0030] Figure 6 is a schematic diagram of the clamping component structure of the present invention;

[0031] Figure 7 is a schematic diagram of the clamping plate structure of the present invention;

[0032] Figure 8 is a schematic diagram of the bearing assembly structure of the present invention;

[0033] Figure 9 is a schematic diagram of the clamping mechanism of the present invention;

[0034] Figure 10 is a schematic diagram of the top plate structure of the present invention;

[0035] Figure 11 is a schematic diagram of the No. 2 connecting rod structure of the present invention;

[0036] Figure 12 is a schematic diagram of the auxiliary mechanism structure of the present invention;

[0037] Figure 13 is a schematic diagram of the elastic support mechanism of the present invention;

[0038] Figure 14 is a schematic diagram of the slider structure of the present invention.

[0039] In the diagram: 1. Base; 2. Frame; 3. Control panel; 4. Linear drive assembly; 5. Clamping mechanism; 501. Lifting plate; 502. Guide rail frame; 503. First connecting rod; 504. Clamping plate; 505. Second connecting rod; 506. Strip groove; 6. Elastic support mechanism; 601. First rotating seat; 602. Pressure plate; 603. Third connecting rod; 604. Connecting block; 605. Slider; 606. Sliding rod; 607. Support 7. Spring; 8. Extension table; 9. Workbench frame; 10. Alignment plate; 11. Clamping assembly; 12. Welding control assembly; 13. Monitoring assembly; 14. Mounting plate No. 1; 15. Cylinder; 16. Mounting plate No. 2; 17. Fixing bracket; 18. Drive plate; 19. Top plate; 20. Rack; 21. Support plate; 21. Auxiliary mechanism; 2101. Rotary seat No. 2; 2102. Swing rod; 2103. Electric push rod; 22. Shaft seat assembly. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please refer to Figures 1-8. The present invention provides a technical solution: a plasma arc welding equipment for straight seam welding of vehicle frame, including a frame 2 that is bolted to the upper surface of a base 1, and a workbench 8 that supports the vehicle frame is bolted to the side of the base 1 located below the frame 2.

[0042] The surface of the frame 2 is equipped with a linear drive assembly 4 that drives the welding control assembly 11 to move laterally and linearly, and the welding control assembly 11 is installed on the outside of the linear drive assembly 4. The surface of the frame 2 near the welding control assembly 11 is equipped with a monitoring assembly 12 for monitoring the welding operation. The side of the frame 2 near the monitoring assembly 12 is equipped with a control panel 3. The end of the workbench frame 8 away from the base 1 is fixed with an extension table 7.

[0043] In practice, the operator first places the frame workpiece to be welded stably on the workbench 8 supported on the side of the machine base 1. The extension table 7 at the front end of the workbench 8 facilitates the placement of the workpiece. Then, the operator sets the process parameters such as welding current, voltage, gas flow and welding speed through the control panel 3 installed on the side of the machine base 2, and starts the automatic welding program. At this time, the linear drive component 4 installed on the surface of the machine base 2 drives the welding control component 11 to move in a horizontal linear motion. The welding control component 11, as the core execution unit of plasma arc welding, forms a high-temperature plasma arc through ionized protective gas to precisely weld the straight seam of the frame.

[0044] During the welding process, the linear drive component 4 drives the welding control component 11 to move laterally, so that the gaps between the two sides of the frame are connected and fused together. The monitoring component 12 collects images or sensor signals of the welding area in real time and feeds them back to the control panel 3 to realize dynamic monitoring and closed-loop quality control of the welding process.

[0045] Referring to Figures 1-6, 9 and 11, it can be seen that the frame 2 is equipped with a clamping assembly 10 for positioning the top of the vehicle frame workpiece below the top of the workbench 8. The workbench 8 is equipped with a support plate 20 for supporting the vehicle frame workpiece by bolts near the center of the clamping assembly 10. The second mounting plate 15 and the fixing bracket 16 are fixed on the outer side wall of the workbench 8. The first mounting plate 13 is installed at the bottom opening of the workbench 8 by bolts.

[0046] In practice, during welding, the clamping component 10 is first moved downwards and pressed against the surface of the frame workpiece, exposing the relative joint of the frame workpiece. Then, the welding control component 11 moves at the center opening of the clamping component 10 to weld the gap of the frame. The support plate 20 supports the weld.

[0047] Referring to Figures 3-11, both sides of the workbench 8 are equipped with clamping mechanisms 5 that are connected to the fixed frame 16 and make the vehicle frame workpieces fit tightly together. The clamping mechanisms 5 extend into the inner cavity of the workbench 8. The clamping mechanisms 5 include clamping plates 504 located on both sides of the workbench 8 that press the outer side of the vehicle frame workpieces. The inner side of the clamping plates 504 is movably sleeved with a first connecting rod 503 and a second connecting rod 505 that are distributed vertically.

[0048] The first connecting rod 503 and the second connecting rod 505 are both connected to the fixed frame 16 by bearings. The inner cavity of the workbench frame 8 is provided with a lifting plate 501. The inner side of the workbench frame 8 near the lifting plate 501 is fixed with a guide rail frame 502 for the lifting plate 501 to slide up and down. Both ends of the lifting plate 501 are provided with strip grooves 506 for the end of the second connecting rod 505 to slide.

[0049] In practice, before welding, the chassis workpiece is placed between the workbench 8 and the frame 2, and then raised by the lifting plate 501. The guide rail 502 stably guides the lifting movement of the lifting plate 501. The lifting plate 501 drives the strip groove 506 to rise, and the strip groove 506 squeezes the end of the second connecting rod 505. According to Figure 9, after being squeezed by the strip groove 506, the second connecting rod 505 will rotate on the fixed frame 16. The other end of the second connecting rod 505 lifts the clamping plate 504 upward. The clamping plate 504 squeezes the first connecting rod 503, causing the first connecting rod 503 to rotate with the second connecting rod 505, driving the clamping plate 504 to rise and approach the two sides of the chassis workpiece, clamping and squeezing the two sides of the chassis workpiece, so that the welding surfaces of the two chassis workpieces are tightly attached, preventing the torsional deformation caused by the thermal stress generated by the high temperature of welding. The clamping plates 504 on both sides can form a rigid constraint on the workpiece, effectively resisting this deformation trend.

[0050] Compared to the limiting method that only uses top clamping, this clamping setting on both sides can be carried out simultaneously and in conjunction with top clamping. This can prevent the frame workpiece from warping upwards and shrinking laterally during welding. It also reduces the gap between the frame workpieces, avoiding uneven heat transfer, insufficient penetration, or even defects such as porosity and incomplete penetration caused by excessive gaps.

[0051] Referring to Figures 8 and 9, a cylinder 14 for driving the lifting plate 501 to rise and fall is bolted to the bottom of the first mounting plate 13.

[0052] In practice, cylinder 14 pushes the lifting plate 501 to rise and fall, and the strip groove 506 squeezes the second connecting rod 505 to make it rotate, thereby simultaneously raising the two side clamping plates 504 to rigidly clamp the frame workpiece.

[0053] Referring to Figures 7-11, a drive disk 17 is fixedly connected to one end of the first connecting rod 503 connected to the fixed frame 16. A toothed block is provided on one side of the drive disk 17, and a rack 19 is meshed with one side of the toothed block. One end of the rack 19 is connected to an integrally formed top plate 18. The rotating disc of the drive disk 17 meshes with the rack 19, and the rack 19 then drives the top plate 18 to rotate.

[0054] The top plate 18 is an arc-shaped structure with one side edge being straight and the other side edge being convex. The inner side of the top plate 18 is provided with an eccentrically connected bearing assembly 22. The bearing assembly 22 includes a shaft and a fixed seat. The fixed seat is connected to the outer wall of the workbench 8, the shaft is connected to the top plate 18, and the shaft and the fixed seat are connected by a bearing. The rack 19 is arc-shaped.

[0055] In specific implementation, after the clamping plate 504 moves away from both sides of the frame workpiece, the frame workpiece is no longer restricted by the clamping plate 504. During the process of the clamping plate 504 moving away, the first connecting rod 503 and the second connecting rod 505 rotate in the opposite direction to the rotation of the clamping. At this time, the first connecting rod 503 drives the drive disk 17 to rotate. The toothed block of the drive disk 17 and the rack 19 are meshed, so that the drive disk 17 drives the rack 19 to rotate in the opposite direction. The rack 19 then drives the top plate 18 to rotate. Because the top plate 18 is restricted by the bearing assembly 22, the convex part of the top plate 18 rotates upward in an eccentric manner and squeezes one side of the frame workpiece, so that one side of the frame workpiece is tilted, as shown in Figure 11.

[0056] After welding is completed, the welded surface of the chassis workpiece may temporarily adhere to the workbench 8 due to thermal expansion or cooling contraction. The top plate 18 lifts one side of the chassis workpiece and uses the lever principle to lift it smoothly from one side, thereby breaking the complete contact between the workpiece and the workbench, eliminating the vacuum suction force, and allowing the workpiece to be removed quickly and without damage. The curvature of the top plate 18 provides progressive and uniform support, replacing the point contact method of pry bars or sharp edges, and preventing the formation of indentations or local deformation on the workpiece surface.

[0057] Referring to Figures 3, 5-7 and 12, the upper surfaces of the extension table 7 and the workbench 8 are equipped with auxiliary mechanisms 21 for aligning the ends of the vehicle frame workpieces. The auxiliary mechanisms 21 are connected to the second mounting plate 15. The auxiliary mechanisms 21 include a second rotating seat 2101 fixed to the surfaces of the extension table 7 and the workbench 8.

[0058] The inner side of the second rotating seat 2101 is movably sleeved with an alignment plate 9 for flipping and aligning the end of the frame workpiece. The end of the alignment plate 9 is fixedly connected with a swing rod 2102 that drives the alignment plate 9 to rotate. One side of the swing rod 2102 is connected to the second mounting plate 15 through a hinge with an electric push rod 2103.

[0059] In practice, during welding, the chassis workpiece is first placed on the workbench 8. Then, the electric push rod 2103 is activated, causing the output end of the electric push rod 2103 to extend and push the swing rod 2102. Subsequently, the end of the swing rod 2102 drives the alignment plate 9 to rotate around the axis of the second rotating seat 2101, so that the alignment plate 9 is adjusted from a horizontal state to a vertical state and pressed against both ends of the chassis workpiece. This adjusts the ends of the two chassis workpieces that were not aligned to a straight and aligned state, avoiding the situation where the ends are different lengths during welding. This ensures a tight connection between the two chassis workpieces. Combined with the lateral clamping of the clamping mechanism 5, it prevents deformation and cracking caused by defects such as incomplete penetration or undercut, thus improving the welding quality.

[0060] When the alignment plate 9 is in a horizontal position, it does not affect the removal of the chassis workpiece. Compared with the fixed vertical alignment structure, the movable and adjustable alignment plate 9 is more convenient and does not require manual alignment by the staff.

[0061] Referring to Figures 5-7 and 11-14, both ends of the alignment plate 9 are fixed with elastic support mechanisms 6 to support the tilted frame workpiece. The elastic support mechanism 6 includes connecting blocks 604 fixed at both ends of the alignment plate 9. A sliding rod 606 is fixed in the inner cavity of the connecting block 604. A slider 605 and a support spring 607 that elastically supports the slider 605 are slidably sleeved on the outer side of the sliding rod 606.

[0062] The outer side of the connecting block 604 is connected to an inclined pressure plate 602 via a first rotating seat 601. The slider 605 and the pressure plate 602 are connected by a third connecting rod 603 that supports the pressure plate 602 via a hinge. The pressure plate 602 is inclined near the outer edge of the frame workpiece.

[0063] In practice, after the top plate 18 lifts one side of the frame workpiece, the other side of the frame workpiece contacts the pressure plate 602, which exerts a certain squeezing force on the pressure plate 602. This causes the pressure plate 602 to squeeze the slider 605 through the third connecting rod 603, and the end of the pressure plate 602 rotates on the first rotating seat 601. Then the slider 605 slides down on the sliding rod 606 and squeezes the support spring 607, causing the support spring 607 to contract. The rebound force of the support spring 607 provides elastic support to the slider 605, so that the pressure plate 602 always presses against one side of the frame workpiece, providing elastic support for the tilted frame workpiece. This facilitates cooperation with the top plate 18 and helps the frame workpiece to detach from the worktable.

[0064] The pressure plate 602 is inclined near the outer edge of the frame workpiece. During the process of adjusting the alignment plate 9 from a horizontal state to a vertical state, the pressure plate 602 is close to the corner of the frame workpiece. Due to the inclined edge, the corner of the frame workpiece can easily squeeze the pressure plate 602, so that the end of the pressure plate 602 can rotate on the first rotating seat 601. The position in contact with the frame workpiece can be elastically displaced, which does not hinder the alignment operation of the alignment plate 9. It can also meet the needs of frame workpieces of different widths and provide a certain support distance for the frame workpiece. At the same time, the elastic support mechanism 6 is located at the four corners of the frame workpiece and cooperates with multiple clamping structures to effectively solve the welding misalignment problem.

[0065] In summary, when using the plasma arc welding equipment for straight seam welding of vehicle frames, the vehicle frame workpiece is first placed on the workbench 8. Before alignment, the electric push rod 2103 pushes the swing rod 2102 to raise the alignment plate 9 and flatten the ends of the two workpieces. Then, the cylinder 14 drives the lifting plate 501 to rise, and the second connecting rod 505 is squeezed through the strip groove 506, which in turn links the first connecting rod 503 to make the clamping plates 504 on both sides clamp the workpieces simultaneously, ensuring that the welding surfaces are tightly fitted. During welding, the linear drive component 4 drives the welding control component 11 to move along the straight seam to complete the welding. The monitoring component 12 monitors in real time. After welding, the clamping plate 504 is released, and the drive disc 17 is driven by the connecting rod to mesh with the rack 19, so that the top plate 18 rotates eccentrically to lift one side of the workpiece, breaking the suction and making it easier to remove the workpiece. At the same time, the other side of the workpiece is provided with adaptive elastic support by the pressure plate 602 under the action of the support spring 607. The contents not described in detail in this description are existing technologies known to those skilled in the art.

Claims

1. A plasma arc welding device for straight seam welding of vehicle frames, comprising a frame (2) bolted to the upper surface of a base (1), wherein a workbench (8) supporting the vehicle frame is bolted to the side of the base (1) located below the frame (2), characterized in that: An extension table (7) is fixed at one end of the workbench (8) away from the machine base (1); clamping mechanisms (5) for tightly fitting the chassis workpieces are installed on both sides of the workbench (8). The clamping mechanism (5) includes clamping plates (504) located on both sides of the workbench (8) for pressing the outer side of the chassis workpiece. A first connecting rod (503) and a second connecting rod (505) distributed vertically are movably sleeved on the inner side of the clamping plate (504). One end of the first connecting rod (503) is provided with a drive disc (17) and a top disc (18) with one side edge straight and the other side edge convex. The upper surfaces of the extension table (7) and the workbench (8) are equipped with auxiliary mechanisms (21) for aligning the ends of the frame workpiece. The auxiliary mechanism (21) includes a second rotating seat (2101) fixed on the surfaces of the extension table (7) and the workbench (8). The inner side of the second rotating seat (2101) is movably fitted with an alignment plate (9) for flipping and aligning the ends of the frame workpiece. Both ends of the alignment plate (9) are fixed with elastic support mechanisms (6) for supporting the inclined frame workpiece. The elastic support mechanism (6) includes a pressure plate (602) located at the corner of the frame workpiece.

2. The plasma arc welding equipment for straight seam welding of vehicle frames according to claim 1, characterized in that: The frame (2) is located below the top of the workbench (8) and a clamping assembly (10) for positioning the top of the frame workpiece is installed. The workbench (8) is near the center of the clamping assembly (10) and a support plate (20) for supporting the frame workpiece is installed by bolts. A second mounting plate (15) and a fixing frame (16) are fixed on the outer side wall of the workbench (8). A first mounting plate (13) is installed at the bottom opening of the workbench (8) by bolts.

3. The plasma arc welding equipment for straight seam welding of vehicle frames according to claim 2, characterized in that: The clamping mechanism (5) is connected to the fixed frame (16), and the clamping mechanism (5) extends into the inner cavity of the workbench frame (8). The auxiliary mechanism (21) is connected to the second mounting plate (15).

4. The plasma arc welding equipment for straight seam welding of vehicle frames according to claim 1, characterized in that: The surface of the frame (2) is equipped with a linear drive assembly (4) that drives the welding control assembly (11) to move laterally in a straight line, and the welding control assembly (11) is installed on the outside of the linear drive assembly (4). The surface of the frame (2) near the welding control assembly (11) is equipped with a monitoring assembly (12) for monitoring the welding operation, and a control panel (3) is installed on the side of the frame (2) near the monitoring assembly (12).

5. The plasma arc welding equipment for straight seam welding of vehicle frames according to claim 3, characterized in that: The first connecting rod (503) and the second connecting rod (505) are connected to the fixed frame (16) by bearings. The inner cavity of the workbench frame (8) is provided with a lifting plate (501). The inner side of the workbench frame (8) near the lifting plate (501) is fixed with a guide rail frame (502) for the lifting plate (501) to slide. Both ends of the lifting plate (501) are provided with strip grooves (506) for the end of the second connecting rod (505) to slide. The cylinder (14) for driving the lifting plate (501) to rise and fall is installed below the first mounting plate (13) by bolts.

6. The plasma arc welding equipment for straight seam welding of vehicle frames according to claim 5, characterized in that: The first connecting rod (503) is connected to the fixed frame (16) at one end and the drive disk (17) is fixedly connected. The drive disk (17) has a toothed block on one side, and a rack (19) is meshed on one side of the toothed block. The top plate (18) and one end of the rack (19) form an integral structure.

7. The plasma arc welding equipment for straight seam welding of vehicle frames according to claim 6, characterized in that: The inner side of the top plate (18) is provided with an eccentrically connected bearing assembly (22). The bearing assembly (22) includes a shaft and a fixed seat. The fixed seat is connected to the outer wall of the workbench (8), the shaft is connected to the top plate (18), and the shaft and the fixed seat are connected by a bearing.

8. The plasma arc welding equipment for straight seam welding of vehicle frames according to claim 1, characterized in that: The end of the alignment plate (9) is fixedly connected to a swing rod (2102), and one side of the swing rod (2102) is connected to the second mounting plate (15) via a hinge to an electric push rod (2103).

9. The plasma arc welding equipment for straight seam welding of vehicle frames according to claim 1, characterized in that: One end of the pressure plate (602) is movably connected to a rotating seat (601). A connecting block (604) is fixed on the side of the rotating seat (601) away from the pressure plate (602), and the connecting block (604) is connected to both ends of the alignment plate (9).

10. The plasma arc welding equipment for straight seam welding of vehicle frames according to claim 9, characterized in that: A slide rod (606) is fixed in the inner cavity of the connecting block (604). A slider (605) and a support spring (607) that provides elastic support to the slider (605) are slidably sleeved on the outside of the slide rod (606). A third connecting rod (603) that supports the pressure plate (602) is connected between the slider (605) and the pressure plate (602) through a hinge.

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