Electric arc welding device and method for new energy automobile frame

Abstract

The invention provides an electric arc welding device and method for a new energy automobile frame, and relates to the technical field of electric arc welding, the electric arc welding device comprises a feeding unit, a positioning welding assembly and a material receiving unit, the feeding unit bears a frame tray through multiple stations and conveys the frame tray to the positioning welding assembly, and the material receiving unit receives the frame tray; the frame trays are used for bearing components of a frame, and the adjacent frame trays have the functions of connection and distance fine adjustment. The station tables are meshed with the gear rings on the outer sides of the rotating shafts through the gears installed on the internal angle plates, independent rotation is achieved through cooperation with driving of the gear motor, synchronous rotation does not need to be dependent on the rotating shafts, when welding of the frame parts on a certain station table is unqualified, defective products can be transferred to a waste conveying belt through independent rotation of the station table to be automatically conveyed away, and the working efficiency is greatly improved. And the other station tables can continue to keep welding operation, so that the problem of overall shutdown caused by a single defective product of a traditional device is thoroughly solved, and the production efficiency and continuity are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of arc welding technology, and in particular to an arc welding apparatus and method for new energy vehicle frames. Background Technology

[0002] As a core load-bearing component of the entire vehicle, the chassis of a new energy vehicle directly determines the vehicle's driving safety, handling stability, and lightweight level. Its materials primarily utilize lightweight materials such as high-strength steel and aluminum alloys to meet the core requirement of new energy vehicles for extended driving range. Arc welding, with its advantages of high welding strength, mature technology, and controllable cost, has become the most crucial connection process in new energy vehicle chassis manufacturing. It not only requires welded joints to meet overall vehicle safety standards but also needs to balance mass production efficiency and compatibility with multiple vehicle models. With the accelerated iteration of new energy vehicle models, multi-model co-production, improved welding precision, and rapid handling of defective products have become key technical demands in the chassis welding field. Existing arc welding devices for new energy vehicle frames still suffer from the following technical defects: First, the workstations of traditional devices are mostly integral synchronous rotating structures. When a defective weld occurs at a single workstation, the machine must be stopped for disassembly and treatment, causing the entire production line to be interrupted and severely affecting production continuity. Second, the load-bearing structures of existing devices are mostly adapted to a single vehicle model. When producing multiple models, the entire set of tooling fixtures must be replaced, which not only increases equipment investment costs but also prolongs production changeover time, making it difficult to meet the needs of flexible production. Third, existing frame load-bearing components lack reliable connection mechanisms and spacing fine-tuning functions. When frame components are docked, positioning deviations are prone to occur, resulting in excessive gaps or misalignments in the welded joints, directly affecting welding accuracy and frame structural strength. Therefore, this invention proposes an arc welding device and method for new energy vehicle frames to solve the problems existing in the prior art. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes an arc welding device and method for new energy vehicle frames. It achieves rapid processing of defective products through an independently rotating workstation, ensuring production continuity. The workstation rotates independently via gears mounted on internal angle plates that mesh with a gear ring on the outer side of the rotating shaft, driven by a geared motor. This eliminates the need for synchronous rotation of the shaft. When a frame component on a particular workstation fails to weld properly, the defective product can be automatically transferred to a scrap conveyor belt and removed through the independent rotation of that workstation. The remaining workstations can continue welding operations, completely solving the problem of traditional devices causing overall shutdown due to a single defective product, significantly improving production efficiency and continuity.

[0004] To achieve the objectives of this invention, the invention is implemented through the following technical solution: an arc welding device for a new energy vehicle frame, comprising a feeding unit, a positioning welding assembly, and a receiving unit. The feeding unit carries a frame pallet through a multi-station system and delivers the frame pallet to the positioning welding assembly. The frame pallet is used to carry the components of the frame, and adjacent frame pallets have the functions of connection and fine-tuning the spacing. The positioning welding assembly includes a motion seat, a rotating shaft, and a worktable. There are two sets of motion seats, and the rotating shaft is rotatably connected between the two sets of motion seats. The rotating shaft is equipped with a worktable, and there are at least four sets of worktables. The four sets of worktables have the function of rotating synchronously with the rotating shaft and rotating independently. Each of the four sides of the worktable is provided with a guide groove for the movement of the vehicle frame pallet. A welding robot is movably mounted above the worktable, and a waste conveyor belt is mounted below the worktable.

[0005] A further improvement is that the feeding unit includes a first base and a first frame. The first frame has at least four sets, and the first frame is located on top of the first base. The inner side of the first frame is provided with a first guide rod, and a first guide block is movably provided on the first guide rod. The first guide block is provided with a bearing plate, and the bearing plate is used to support the vehicle frame pallet. Both sides of the first frame are provided with a first drive belt, and both sides of the first guide block are connected to the first drive belt.

[0006] A further improvement is that the positioning welding assembly also includes a frame and a track rod. The track rod is provided on both sides below the frame. The motion seat includes a base and a lifting platform. The base is slidably mounted on the track rod, and a drive wheel is provided at the bottom of the base. The lifting platform is located above the base, and a bearing is provided above the lifting platform. The rotating shaft is rotatably connected between the bearings on both sides.

[0007] A further improvement is that: a first gear is provided on both sides of the rotating shaft, an encoder for identifying the rotation angle of the first gear is provided on the shaft seat on one side, and a second gear adapted to the first gear is rotatably provided on the outer side of the shaft seat on the other side. A pulley is connected to one side of the second gear. A motor is provided on the top of the lifting platform, and the output end of the motor is connected to the pulley through a wheel body and a belt. A guide plate is provided on the top of the motion seat near the feeding unit, and the guide groove is provided on the top of the guide plate.

[0008] A further improvement is that: movable slots are provided on the upper sides of both sides inside the frame, and connecting rods are movably installed inside the movable slots, and the welding robot is movably mounted on the connecting rods.

[0009] A further improvement is that: the workstation is provided with an inner corner plate, and a gear is rotatably provided on the inner side of the corner plate. The gear is driven to rotate by a reduction motor, and a gear ring adapted to the gear is provided on the outer side of the rotating shaft.

[0010] A further improvement is that: telescopic rods are rotatably provided at the four corners of one side of the workstation, and the output end of the telescopic rods is connected to a semi-circular plate. Semi-circular grooves are provided at the four corners of the workstation away from the telescopic rods, and the semi-circular plates are used to insert into the semi-circular grooves and rotate to fix them.

[0011] Further improvements include: the frame pallet includes a pallet and clamping claws; the four corners of the bottom of the pallet are rotatably equipped with bottom wheels and side wheels that are adapted to the guide grooves; the four corners of the top of the pallet are equipped with adjustment platforms for height and direction adjustment; the clamping claws are mounted on the adjustment platforms; the two ends of one side of the pallet are slidably equipped with insert rods; and a push cylinder is located in the middle of one side of the pallet; the output end of the push cylinder is connected to a connecting plate, and the connecting plate connects two sets of insert rods; a ball is movably equipped at one end of the outer side of the insert rod; a pneumatic rod is equipped at one end of the inner side of the insert rod; and a funnel block adapted to the ball is provided at the output end of the pneumatic rod; the two ends of the pallet away from the insert rods are equipped with slots adapted to the insert rods; and the inner side of the slots is equipped with fixing holes adapted to the ball.

[0012] A further improvement is that the receiving unit includes a second base, a second frame, and a second guide rod. The second frame is located above the second base, the second guide rod is located inside the second frame, and a second guide block is movably mounted on the second guide rod. A receiving rod for supporting the vehicle frame pallet is located above the second guide block. A second drive belt is provided on both sides of the second frame, and the upper surface of the second drive belt is connected to the second guide block.

[0013] An arc welding method for new energy vehicle frames includes the following steps: The multi-station support pallet of the frame is fed by the feeding unit and then delivered to the positioning and welding assembly. Each workstation supports the chassis pallet on three sides, and the chassis pallet supports the chassis components. During welding, the spacing between adjacent frame trays is finely adjusted to ensure that the frame components supported on them fit together, and welding is performed by a welding robot. By rotating the pivot, all workstations are rotated, allowing for the welding and processing of the frame components on the other side. When a frame component on a certain workstation fails to meet welding standards, the workstation rotates independently, sending the defective frame component onto the scrap conveyor belt for removal. The workstation then continues to rotate, allowing frame components on other sides to be welded, or it rotates to an empty side for frame components from other workstations to pass through and be discharged. When welding frame components for different vehicle models is required, different models of frame components are mounted on frame trays on different sides of the workbench, and switching is achieved by independently rotating the workbench. After welding is completed, the chassis pallet moves to the receiving unit for unloading.

[0014] The beneficial effects of this invention are as follows: 1. This invention enables rapid processing of defective products through independently rotating workstations, ensuring production continuity: The workstations rotate independently by meshing gears mounted on internal corner plates with gear rings on the outer side of the rotating shaft, driven by a geared motor. This eliminates the need for synchronous rotation of the rotating shaft. When a frame component on a certain workstation fails to meet welding standards, the defective product can be automatically transferred to the waste conveyor belt and removed through the independent rotation of that workstation. The remaining workstations can continue welding operations, completely solving the problem of overall shutdown caused by a single defective product in traditional equipment, and significantly improving production efficiency and continuity.

[0015] 2. This invention features a workstation design with three sides supporting the chassis pallet and one side empty, adapting to flexible production of multiple vehicle models. Of the four sides of each workstation, three sides support the chassis pallet via guide grooves, while one side is reserved for vacancy. The chassis pallet can support corresponding chassis components according to the needs of different vehicle models. By independently rotating the workstation, different models of welding workpieces can be quickly switched without changing the entire set of tooling. For a series of vehicle models using the same basic components, co-line production can be achieved through combinations of chassis pallets on different sides, which reduces the tooling investment cost for multi-vehicle production, shortens the vehicle model changeover time, and significantly improves the equipment's versatility and flexible production capabilities.

[0016] 3. The vehicle frame tray of this invention has connection and spacing fine-tuning functions to ensure welding precision. Adjacent vehicle frame trays are reliably connected through a rod on one side of the tray and a slot on the other side. A cylinder drives the rod to extend and retract through a connecting plate. The cylinder drives the funnel block to push the ball into the fixing hole of the slot to complete the positioning. The spacing between adjacent vehicle frame trays can be precisely fine-tuned. This structure enables the vehicle frame components on the tray to be tightly connected before welding, effectively eliminating gaps and misalignments during component connection, significantly improving the tightness and welding precision of the welded joint, and ensuring the structural strength and dimensional stability of the new energy vehicle frame. Attached Figure Description

[0017] Figure 1 This is the front view of the present invention; Figure 2 This is a schematic diagram of the feeding unit of the present invention; Figure 3 This is a schematic diagram of the positioning and welding assembly of the present invention; Figure 4 This is a schematic diagram of the workstation mounting structure of the present invention; Figure 5 This is a schematic diagram of the workstation of the present invention; Figure 6 This is a schematic diagram of the vehicle frame tray of the present invention; Figure 7 This is a schematic diagram of the insertion rod of the present invention; Figure 8 This is a schematic diagram of the receiving unit of the present invention.

[0018] The components include: 1. Feeding unit; 2. Positioning welding assembly; 3. Receiving unit; 4. Chassis pallet; 5. Rotary shaft; 6. Workstation; 7. Guide groove; 8. Welding robot; 9. First base; 10. First frame; 11. First guide rod; 12. First guide block; 13. Bearing plate; 14. First drive belt; 15. Frame; 16. Track rod; 17. Base; 18. Drive wheel; 19. Lifting platform; 20. Shaft seat; 21. First gear; 22. Second gear; 23. Pulley; 24. Guide plate; 25. Live... 26. Moving groove; 27. Connecting rod; 28. Angle plate; 29. ​​Gear; 30. Gear ring; 31. Telescopic rod; 32. Semicircular plate; 33. Support plate; 34. Bottom wheel; 35. Side wheel; 36. Adjusting platform; 37. Clamping claw; 38. Inserting rod; 39. Push cylinder; 40. Connecting plate; 41. Ball bearing; 42. Air rod; 43. Funnel block; 44. Slot; 45. Waste conveyor belt; 46. Second base; 47. Second frame; 48. Second guide rod; 49. Second guide block; 50. Receiving rod; 51. Second drive belt. Detailed Implementation

[0019] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0020] Example 1 according to Figure 1 , 2 As shown in Figures 3, 4, 5, 6, 7, and 8, this embodiment proposes an arc welding device for a new energy vehicle frame, including a feeding unit 1, a positioning welding assembly 2, and a receiving unit 3. The feeding unit 1 carries a frame pallet 4 through a multi-station support and delivers the frame pallet 4 to the positioning welding assembly 2. The frame pallet 4 is used to carry the components of the frame, and adjacent frame pallets 4 have the function of connection and fine-tuning the spacing. The positioning welding assembly 2 includes a motion seat, a rotating shaft 5, and a work platform 6. There are two sets of motion seats, and the rotating shaft 5 is rotatably connected between the two sets of motion seats. The work platform 6 is provided on the rotating shaft 5, and there are at least four sets of work platforms 6. The four sets of work platforms 6 have the function of rotating synchronously with the rotating shaft 5 and rotating independently. Each of the four sides of the work platform 6 is provided with a guide groove 7 for the movement of the frame pallet 4. A welding robot 8 is movably installed above the work platform 6, and a waste conveyor belt 44 is installed below the work platform 6. The feeding unit 1 achieves batch loading and continuous conveying of the frame pallet 4 through a multi-station layout. After the frame pallet 4 enters the workstation 6 through the guide groove 7, adjacent pallets are connected by a connecting structure and the spacing is finely adjusted to support the frame components and ensure that the frame components fit precisely. The workstation 6 can achieve overall synchronous rotation through the rotating shaft 5 to meet the needs of multi-face welding. It can also rotate independently to transfer defective products to the waste conveyor belt 44. The welding robot 8 cooperates to complete precise welding. The receiving unit 3 receives the finished products, forming a closed-loop operation process of "feeding-welding-sorting-receiving".

[0021] The feeding unit 1 includes a first base 9 and a first frame 10. The first frame 10 has at least four sets and is located on top of the first base 9. A first guide rod 11 is provided inside the first frame 10, and a first guide block 12 is movably mounted on the first guide rod 11. A bearing plate 13 is mounted on the first guide block 12, and the bearing plate 13 is used to support the vehicle frame pallet 4. First drive belts 14 are provided on both sides of the first frame 10, and both sides of the first guide block 12 are connected to the first drive belts 14. The first base 9 provides stable support for the first frame 10. The first drive belts 14 synchronously drive the first guide blocks 12 connected to both sides, causing the first guide blocks 12 to slide smoothly along the first guide rod 11. The bearing plate 13 moves with the first guide block 12, accurately conveying the vehicle frame pallet 4 it carries to the designated position of the positioning welding assembly 2. Multiple sets of first frames 10 achieve multi-station feeding, improving feeding efficiency.

[0022] The positioning welding assembly 2 also includes a frame 15 and a track rod 16. The track rod 16 is located on both sides below the frame 15. The motion seat includes a base 17 and a lifting platform 19. The base 17 is slidably mounted on the track rod 16, and a drive wheel 18 is located at the bottom of the base 17. The lifting platform 19 is located above the base 17, and a bearing seat 20 is located above the lifting platform 19. The rotating shaft 5 is rotatably connected between the bearing seats 20 on both sides. The frame 15 provides the installation foundation for the overall welding structure. The drive wheel 18 drives the base 17 to slide along the track rod 16, realizing the horizontal position adjustment of the motion seat and receiving material from different workstations of the first frame 10. The lifting platform 19 is height-adjustable, allowing the rotating shaft 5 to be at a suitable welding height. The bearing seat 20 provides stable rotational support for the rotating shaft 5, ensuring the coaxiality and stability when the rotating shaft 5 drives the workstation 6 to rotate.

[0023] Both sides of the rotating shaft 5 are provided with first gears 21. An encoder for identifying the rotation angle of the first gear 21 is provided on one side of the shaft seat 20. A second gear 22, adapted to the first gear 21, is rotatably mounted on the outer side of the other side of the shaft seat 20. A pulley 23 is connected to one side of the second gear 22. A motor is located on the top of the lifting platform 19, and the output end of the motor is connected to the pulley 23 via a wheel and belt. A guide plate 24 is located on the top of the motion seat near the feeding unit 1, and a guide groove 7 is located on the top of the guide plate 24. The motor drives the pulley 23 to rotate via the wheel and belt, which in turn drives the second gear 22 to rotate. The second gear 22 meshes with the first gear 21, driving the rotating shaft 5 to rotate. The encoder identifies the rotation angle of the first gear 21 in real time, achieving precise control of the rotation angle of the rotating shaft 5. The guide groove 7 on the guide plate 24 mates with the guide groove 7 of the workstation 6, providing guidance for the pallet 4 to enter the workstation 6 from the feeding unit 1, ensuring smooth pallet movement.

[0024] The frame 15 has movable slots 25 on both sides above it, and a connecting rod 26 is movably mounted inside the movable slot 25. The welding robot 8 is movably mounted on the connecting rod 26. The connecting rod 26 can be adjusted to move horizontally along the movable slot 25. The welding robot 8 is mounted on the connecting rod 26, and through the multi-directional movement of the connecting rod 26 and the movement of its own joints, it can achieve multi-directional coverage of welding operations, adapt to the welding needs of frame components at different positions and angles on the workstation 6, and improve welding flexibility and coverage.

[0025] The workstation 6 has an internal corner plate 27, and a gear 28 is rotatably mounted on the inner side of the corner plate 27. The gear 28 is driven to rotate by a reduction motor. A gear ring 29 that matches the gear 28 is mounted on the outer side of the rotating shaft 5. The corner plate 27 provides mounting support for the gear 28. When the workstation 6 needs to rotate independently, the reduction motor drives the gear 28 to rotate, and the gear 28 meshes with the gear ring 29 on the rotating shaft 5, causing a single workstation 6 to rotate independently around the rotating shaft 5, realizing defective product sorting or vehicle model switching. When overall synchronous rotation is required, the reduction motor stops working, the gear 28 and the gear ring 29 are relatively fixed, and the workstation 6 rotates synchronously with the rotating shaft 5 to meet the requirements of multi-face welding.

[0026] Each of the four corners of one side of the workstation 6 is equipped with a telescopic rod 30, and the output end of the telescopic rod 30 is connected to a semi-circular plate 31. Each of the four corners of the workstation 6 away from the telescopic rod 30 is provided with a semi-circular groove. The semi-circular plate 31 is used to insert into the semi-circular groove and rotate to fix it. When multiple workstations 6 need to be used in combination or kept relatively fixed, the telescopic rod 30 extends to push the semi-circular plate 31 into the semi-circular groove of the adjacent workstation 6. After the semi-circular plate 31 rotates, it forms a snap-fit ​​with the semi-circular groove, achieving a stable connection between the workstations 6 and preventing welding accuracy from being affected by the relative displacement of the workstations 6 during welding. When disassembling, the semi-circular plate 31 rotates in the opposite direction, and the telescopic rod 30 retracts to separate the adjacent workstations 6.

[0027] The vehicle frame tray 4 includes a tray plate 32 and clamping claws 36. The tray plate 32 has four rotatable bottom corners equipped with bottom wheels 33 and side wheels 34 that are adapted to the guide grooves 7. The tray plate 32 has four adjustable platforms 35 at its top corners, capable of adjusting height and direction. The clamping claws 36 are mounted on the adjustable platforms 35. Insert rods 37 are slidably provided at both ends of one side of the tray plate 32, and a push cylinder 38 is located in the middle of one side of the tray plate 32. The output end of 38 is connected to a connecting plate 39, and the connecting plate 39 connects two sets of the insert rods 37. One end of the outer side of the insert rod 37 is provided with a ball bearing 40, and one end of the inner side of the insert rod 37 is provided with a pneumatic rod 41. The output end of the pneumatic rod 41 is provided with a funnel block 42 that is compatible with the ball bearing 40. Both ends of the support plate 32 on the side away from the insert rod 37 are provided with slots 43 that are compatible with the insert rod 37, and the inner side of the slots 43 is provided with fixing holes that are compatible with the ball bearing 40. The pallet 32 ​​moves smoothly along the guide groove 7 via the bottom wheel 33 and side wheel 34. The adjustment table 35 can adjust the height and direction of the clamping claw 36 according to the size and angle requirements of the frame components to achieve stable clamping of the frame components. When adjacent pallets are connected, the push cylinder 38 drives the insertion rod 37 to insert into the slot 43 of another pallet through the connecting plate 39. The air rod 41 pushes the funnel block 42 to press the ball 40, so that the ball 40 is embedded in the fixing hole, completing the pallet connection. When fine-tuning the spacing, the push cylinder 38 pushes to adjust the relative spacing to ensure the docking accuracy of the frame components. When separating, the air rod 41 pulls the funnel block 42 so that the ball 40 is located on the concave surface of the funnel block 42, releasing the fixing of the ball 40, and the insertion rod 37 can be pulled out.

[0028] The receiving unit 3 includes a second base 45, a second frame 46, and a second guide rod 47. The second frame 46 is located above the second base 45, and the second guide rod 47 is located inside the second frame 46. A second guide block 48 is movably mounted on the second guide rod 47. A receiving rod 49 for supporting the vehicle frame pallet 4 is located above the second guide block 48. Second drive belts 50 are provided on both sides of the second frame 46, and the upper surface of the second drive belts 50 is connected to the second guide block 48. The second base 45 provides stable support for the second frame 46. The second drive belts 50 drive the second guide block 48 to move along the second guide rod 47. The receiving rod 49 moves with the second guide block 48 to the discharge end of the workstation 6 to receive the vehicle frame pallet 4 after welding. Then, the second drive belts 50 drive the second guide block 48 to move, transporting the vehicle frame pallet 4 to the designated discharge position, realizing the orderly collection of finished products.

[0029] Example 2 according to Figure 1 , 2 As shown in figures 3, 4, 5, 6, 7, and 8, this embodiment proposes an arc welding method for new energy vehicle frames, comprising the following steps: Multi-station feeding ensures continuous material supply: The feeding unit 1 continuously transports the frame pallet 4 to the positioning welding assembly 2 through the multi-station support, eliminating the need for frequent machine stops for material loading and significantly improving the overall production cycle time.

[0030] Multi-faceted support improves workstation utilization: Each workstation 6 supports the frame tray 4 on three sides, making full use of the workstation space and supporting multiple frame components at the same time, supporting batch welding processing.

[0031] Fine-tuning the spacing ensures welding precision: Before welding, the spacing between adjacent frame trays 4 is finely adjusted to ensure a tight fit between frame components. Combined with the precise operation of the welding robot 8, this effectively reduces the risk of welding gaps and misalignment, and improves welding quality.

[0032] Overall synchronous rotation improves multi-face welding efficiency: The rotating shaft 5 drives all workstations 6 to rotate synchronously, which can complete multi-face welding without disassembling or repositioning the frame components, reducing process changeover time.

[0033] Independent rotation enables rapid diversion of defective products: When a defective part appears on a single workstation 6, it can be rotated independently to send the defective product to the waste conveyor belt 44 without affecting the normal operation of other workstations 6 and avoiding the overall shutdown of the production line.

[0034] Workstation recycling ensures smooth processes: After defective products are diverted, workstation 6 can be quickly switched to other bearing surfaces to continue welding, or a discharge channel can be reserved on the empty surface to ensure that the welding and discharge processes do not interfere with each other and improve production continuity.

[0035] Flexible switching adapts to multi-model production: The frame trays 4 on different sides of the workstation 6 can carry frame components of different models. The model can be quickly switched by the independent rotation of the workstation 6 without changing the entire set of tooling, reducing the equipment investment and switching costs for multi-model production.

[0036] Orderly material discharge ensures the standardization of finished products: After welding, the chassis pallet 4 moves precisely to the receiving unit 3 to realize the orderly collection and transfer of finished products, avoid the accumulation or damage of finished products, and improve the integrity and standardization of the production process.

[0037] This invention enables rapid processing of defective products through independently rotating workstations 6, ensuring production continuity. Workstations 6 rotate independently via gears 28 mounted on internal corner plates 27 that mesh with gear rings 29 on the outer side of rotating shaft 5, driven by a geared motor. This eliminates the need for synchronous rotation of rotating shaft 5. When a frame component on a certain workstation 6 fails to meet welding standards, the defective product can be automatically transferred to the waste conveyor belt 44 through the independent rotation of that workstation 6. The remaining workstations 6 can continue welding operations, completely solving the problem of overall shutdown caused by a single defective product in traditional equipment, and significantly improving production efficiency and continuity. Furthermore, this invention features a workstation 6 with three sides bearing load and one side empty, adapting to flexible production of multiple vehicle models. Of the four sides of each workstation 6, three sides bear the chassis pallet 4 via guide grooves 7, while one side is reserved for an empty state. The chassis pallet 4 can bear the corresponding chassis components according to the needs of different vehicle models. By independently rotating the workstation 6, different models of welding workpieces can be quickly switched without changing the entire set of tooling. For a series of vehicle models using the same basic components, co-line production can be achieved by combining chassis pallets 4 on different sides, which not only reduces the tooling investment cost for multi-vehicle production but also shortens the vehicle model changeover time, greatly improving the equipment's versatility and flexible production capabilities. Meanwhile, the frame tray 4 has connection and spacing fine-tuning functions to ensure welding precision. Adjacent frame trays 4 are reliably connected to slots 43 on the other side through the insertion rod 37 on one side of the tray 32. The cylinder 38 drives the insertion rod 37 to extend and retract through the connecting plate 39. The air rod 41 drives the funnel block 42 to push the ball 40 into the fixing hole of the slot 43 to complete the positioning. The spacing between adjacent frame trays 4 can be precisely fine-tuned. This structure enables the frame components on the frame tray 4 to be tightly connected before welding, effectively eliminating gaps and misalignment problems when components are connected, significantly improving the tightness and welding precision of the welded joint, and ensuring the structural strength and dimensional stability of the new energy vehicle frame.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric arc welding device for a new energy vehicle frame, comprising a feeding unit (1), a positioning welding assembly (2) and a receiving unit (3), characterized in that: The feeding unit (1) is provided with a plurality of workpiece carrying trolleys (4), and the trolleys (4) are used to carry the components of the frame and have the functions of connection and fine adjustment of the distance between the adjacent trolleys (4); The positioning and welding assembly (2) comprises a moving seat, a rotating shaft (5) and a workbench (6). The moving seat is provided with two groups. The rotating shaft (5) is rotatably connected between the two groups of moving seats. The workbench (6) is arranged on the rotating shaft (5) and is provided with at least four groups. The four groups of workbenches (6) have the functions of synchronous rotation and independent rotation with the rotating shaft (5). The four sides of the workbench (6) are provided with guide grooves (7) for the movement of the trolley (4). The welding robot (8) is movably arranged above the workbench (6). The waste conveying belt (44) is arranged below the workbench (6).

2. The electric arc welding device for a new energy vehicle frame according to claim 1, characterized in that: The feeding unit (1) comprises a first base (9) and a first rack (10). The first rack (10) is provided with at least four groups. The first rack (10) is arranged on the top of the first base (9). The first guide rod (11) is arranged on the inner side of the first rack (10). The first guide block (12) is movably arranged on the first guide rod (11). The first guide block (12) is provided with a carrying disc (13). The carrying disc (13) is used to carry the trolley (4). The first driving belt (14) is arranged on both sides of the first rack (10). The first guide block (12) is connected with the first driving belt (14) on both sides.

3. The electric arc welding device for a new energy vehicle frame according to claim 1, characterized in that: The positioning and welding assembly (2) further comprises a rack (15) and a track rod (16). The track rod (16) is arranged on both sides below the rack (15). The moving seat comprises a base (17) and a lifting platform (19). The base (17) is slidably arranged on the track rod (16). The bottom of the base (17) is provided with a driving wheel (18). The lifting platform (19) is arranged above the base (17). The top of the lifting platform (19) is provided with an axle seat (20). The rotating shaft (5) is rotatably connected between the two axle seats (20).

4. The electric arc welding device for a new energy vehicle frame according to claim 3, characterized in that: The first gear (21) is arranged on both sides of the rotating shaft (5). The encoder is arranged on one side of the axle seat (20) to identify the rotation angle of the first gear (21). The second gear (22) is rotatably arranged on the outer side of the other axle seat (20) and is matched with the first gear (21). The second gear (22) is connected with the belt pulley (23) on one side. The motor is arranged on the top of the lifting platform (19). The output end of the motor is connected with the belt pulley (23) through the wheel body. The guide plate (24) is arranged on the top of the moving seat near the feeding unit (1). The guide groove (7) is arranged on the top of the guide plate (24).

5. The electric arc welding device for a new energy vehicle frame according to claim 4, characterized in that: The movable groove (25) is arranged on both sides of the top of the rack (15). The connecting rod (26) is movably arranged in the movable groove (25). The welding robot (8) is movably arranged on the connecting rod (26).

6. The electric arc welding device for a new energy vehicle frame according to claim 5, characterized in that: The inside of the work station table (6) is provided with an angle plate (27), and the inner side of the angle plate (27) is rotatably provided with a gear (28), the gear (28) is driven to rotate by a speed reducer motor, and the outer side of the rotating shaft (5) is provided with a gear ring (29) matched with the gear (28).

7. The electric arc welding device for a new energy vehicle frame according to claim 6, characterized in that: The four corners of one side of the work station table (6) are rotatably provided with telescopic rods (30), and the output ends of the telescopic rods (30) are connected with semicircular plates (31), the four corners of the side of the work station table (6) away from the telescopic rods (30) are provided with semicircular grooves, and the semicircular plates (31) are used for being inserted into the semicircular grooves and being rotatably fixed. 8.The arc welding device for a new energy vehicle frame of claim 1, wherein: The frame tray (4) comprises a supporting plate (32) and a clamping jaw (36), the bottom of the supporting plate (32) is rotatably provided with a bottom wheel (33) and a side wheel (34) matched with the guide groove (7) at the four corners, the top of the supporting plate (32) is provided with an adjusting table (35) capable of adjusting height and direction at the four corners, the clamping jaw (36) is mounted on the adjusting table (35), the supporting plate (32) is slidably provided with a plug rod (37) at both ends of one side, and a push cylinder (38) is arranged at the middle position of the inside of the supporting plate (32), the output end of the push cylinder (38) is connected with a connecting plate (39), the connecting plate (39) connects two groups of plug rods (37), one end of the outer side of the plug rod (37) is movably provided with a ball (40), one end of the inner side of the plug rod (37) is provided with a gas rod (41), the output end of the gas rod (41) is provided with a funnel block (42) matched with the ball (40), both ends of the side of the supporting plate (32) away from the plug rod (37) are provided with plug grooves (43) matched with the plug rod (37), and the inner side of the plug groove (43) is provided with a fixing hole matched with the ball (40). 9.The arc welding device for a new energy vehicle frame of claim 1, wherein: The receiving unit (3) comprises a second base (45), a second rack (46) and a second guide rod (47), the second rack (46) is arranged above the second base (45), the second guide rod (47) is arranged on the inner side of the second rack (46), and a second guide block (48) is movably arranged on the second guide rod (47), the upper side of the second guide block (48) is provided with a receiving rod (49) for bearing the frame tray (4), and the two sides of the second rack (46) are provided with second drive belts (50), and the upper surfaces of the second drive belts (50) are connected with the second guide block (48).

10. An electric arc welding method for a new energy automobile frame, using the electric arc welding device for a new energy automobile frame in any one of claims 1-9, comprising the following steps: Through the multi-station bearing frame tray (4) of the feeding unit (1), the frame tray (4) is sent to the positioning and welding assembly (2); Each group of work station tables (6) bears the frame tray (4) through three faces, and bears the frame parts through the frame tray (4); During welding, the spacing between adjacent frame trays (4) is finely adjusted so that the frame parts carried thereon fit, and welding is performed by a welding robot (8); Through the rotation of the rotating shaft (5), all the work station tables (6) are rotated, and the frame parts of another face are welded; When the frame component on a certain station table (6) is not qualified for welding, the station table (6) rotates independently, and the unqualified frame component is sent to the waste conveying belt (44) for conveying away; Then the station table (6) continues to rotate, changes the frame component on the other surface for welding, or turns to the empty surface for the frame component of the other station table (6) to pass through the discharge; When the frame components of different vehicle models need to be welded, different types of frame components are carried on the frame trays (4) on different surfaces of the station table (6), and the switching is realized through the independent rotation of the station table (6); After the welding is completed, the frame tray (4) moves to the receiving unit (3) for discharging.

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