Electric vehicle frame welding device

Abstract

The invention provides an electric vehicle frame welding device, and belongs to the technical field of electric vehicle welding. The device comprises a base plate, a clamp seat, a connecting bolt, a fixed pin, a pressure pump, a placing plate and a fixed compression roller. A first connecting hole is formed in the base plate, and an air channel is formed in the base plate; the position of the clamp seat on the base plate is adjustable; the connecting bolt is used for connecting the clamp seat with the base plate; the fixing pin is arranged in the air channel in a sliding mode so as to fix the connecting bolt arranged in the second connecting hole in a penetrating mode. The pressure pump is connected with the air passage through a pipeline; the placing plate is used for placing a frame metal tube; the stationary platen is configured to move in an arcuate path relative to the placement plate. The invention particularly provides an electric vehicle frame welding device which can adapt to vehicle frames of different models and curve shapes and can carry out multi-point fixing on the vehicle frame to be welded.

Description

Technical Field

[0001] This invention belongs to the field of electric vehicle welding technology, specifically referring to an electric vehicle frame welding device. Background Technology

[0002] Electric vehicles, as a common mode of transportation, have a complex system structure, mainly including a load-bearing system, an energy system, a drive system, a braking system, and a driving system. Among these, the electric vehicle frame in the load-bearing system is one of the core components, playing a crucial role in supporting the vehicle body, the rider, and the weight of all loads.

[0003] Most electric vehicle frames are currently made up of multiple metal tubes connected by welding to form a three-dimensional structure. Due to the diverse design requirements of electric vehicles, the curved shapes of these metal tube frames also exhibit a wide variety, with significant differences in appearance between different models.

[0004] Welding is a crucial step in the production of electric vehicle frames. To ensure the precision and stability of the welding, the metal tubes to be welded must be securely fixed before welding. However, due to the significant differences in the shape of different frame models and the curved structure of the frames themselves, existing welding equipment is difficult to quickly adapt to this diversity and cannot provide a stable and reliable fixing effect for welding different models of electric vehicle frames. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide an electric vehicle frame welding device to at least partially solve the problems mentioned in the background art.

[0006] The technical solution adopted by this invention is as follows: This invention proposes an electric vehicle frame welding device, comprising: The base plate has a first connecting hole and an air passage inside it; Multiple sets of clamp seats are provided, and their positions on the base plate are adjustable. Each clamp seat is provided with a second connecting hole. A connecting bolt is configured to pass through a first connecting hole and a second connecting hole to connect the clamp seat to the base plate; A fixing pin is configured to slide within the airway to fix a connecting bolt that passes through the second connecting hole; A pressure pump is connected to an air passage via a pipeline. The pressure pump applies a driving force to the fixing pin to slide within the air passage, thereby controlling the fixing state of the fixing pin on the connecting bolt. A mounting plate for holding the metal tubing of the vehicle frame; The fixed pressure roller is configured to move relative to the placement plate. When the fixed pressure roller moves to one side of the placement plate, it reserves space for the metal tube to be fed onto the placement plate, thus avoiding the fixed pressure roller from blocking the placement plate and affecting the feeding of the metal tube. When the fixed pressure roller moves above the placement plate, it works with the placement plate to clamp and fix the metal tube.

[0007] Furthermore, a fixing groove is provided on the side wall of the connecting bolt, the fixing groove is adapted to the free end of the fixing pin, a partition is fixedly provided in the air passage, the fixing pin is slidably disposed on the partition, a piston plate is provided at one end of the fixing pin, the other end of the fixing pin is slidably disposed in the first connecting hole through the side wall of the air passage, a mounting plate is provided on the fixing pin, a return spring is connected between the mounting plate and the side wall of the air passage, and the return spring is sleeved on the fixing pin.

[0008] Furthermore, to improve the accurate correspondence between the fixing hole and the fixing pin on the connecting bolt, one of the base plate and the connecting bolt is provided with a positioning groove, and the other is provided with a positioning protrusion, and the positioning groove and the positioning protrusion are adapted to each other.

[0009] Furthermore, the placement plate is provided with a mounting base, the mounting base is rotatably provided with a rotating shaft, the rotating shaft is fixedly provided with a connecting plate, the fixed pressure roller is fixedly connected to the connecting plate, the mounting base is provided with a first motor, and the rotating shaft is connected to the output end of the first motor.

[0010] Furthermore, the distance between the mounting base and the placement plate is adjustable; a threaded rod is threadedly connected to the placement plate, one end of which is rotatably connected to the mounting base, and a sliding rod is slidably provided on the placement plate, which is fixedly connected to the mounting base.

[0011] Furthermore, the placement plate is provided with a placement groove for placing metal tubes, and the placement groove has a V-shaped or U-shaped structure.

[0012] Furthermore, the height of both the mounting base and the rotating shaft is lower than the height of the bottom of the placement groove, and the connecting plate rotates and swings outside the placement plate.

[0013] Furthermore, the fixture base is provided with two sets of relatively movable blocks, each movable block is provided with a lifting cylinder, the free end of the lifting cylinder is provided with a frame plate, the placement plate is rotatably mounted on the frame plate, the frame plate is provided with a second motor, and the placement plate is connected to the output shaft of the second motor.

[0014] Furthermore, the fixture seat is provided with a movable cavity, and a sliding groove is formed on the top wall of the movable cavity. A bidirectional screw is rotatably provided in the movable cavity. Two sets of movable blocks are respectively connected to the two ends of the bidirectional screw through threads. The movable blocks are engaged and slidably disposed in the sliding groove. A movable motor is fixedly provided on the fixture seat. A driving gear is fixedly provided on the output shaft of the movable motor. A driven gear is fixedly provided on the bidirectional screw. The driving gear and the driven gear mesh.

[0015] Furthermore, an electric vehicle frame welding device further includes a push plate. The base plate is provided with a track. Two sets of support plates are fixedly provided at both ends of the clamp seat. Rollers are rotatably provided on the support plates. The support plates move along the track via the rollers. A push groove is provided on the support plates. The push plate is configured to move above the support plates. A telescopic cylinder is provided on the push plate. A push column is provided at the free end of the telescopic cylinder. The push column is adapted to the push groove. When the push column is inserted into the push groove of the support plate, the moving push plate drives the set of support plates to move on the track.

[0016] The technical solution provided by this invention has the following beneficial effects: (1) By connecting the bolts and the first and second connecting holes, the position of the clamp seat on the base plate can be flexibly adjusted. With the setting of multiple clamp seats, it can adapt to the metal tube fixing requirements of electric vehicle frames of different models and different curve shapes, solving the problem that the existing device is difficult to adapt to diverse frames. At the same time, by cooperating with multiple clamp seats, the frame can be precisely positioned at multiple points, effectively improving the stability and accuracy during welding.

[0017] (2) By using the matching structure of the connecting bolt and the fixing pin, combined with the control method of the pressure pump driving the fixing pin through the air passage, the fixing and loosening of the fixture seat can be realized quickly, which simplifies the operation process of adjusting the position of the fixture seat and improves the adjustment efficiency of the device; the fixed pin driven by air pressure has a uniform and stable force, which can ensure that the connection between the connecting bolt and the fixture seat and the base plate is firm, avoid loosening caused by vibration during the welding process, and ensure the welding quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an electric vehicle frame welding device according to an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of part A; Figure 3 This is a schematic cross-sectional view of the electric vehicle frame welding device according to an embodiment of the present invention, taken from the front view direction. Figure 4 for Figure 3 A magnified view of part B; Figure 5 This is a schematic diagram of the fixture seat of an electric vehicle frame welding device according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the placement plate and fixed pressure roller of an electric vehicle frame welding device according to an embodiment of the present invention; Figure 7 This is a top view of the fixture seat of an electric vehicle frame welding device according to an embodiment of the present invention; Figure 8 This is a side view of the placement plate and fixed pressure roller of an electric vehicle frame welding device according to an embodiment of the present invention.

[0019] The components are as follows: 1. Base plate; 2. First connecting hole; 3. Air passage; 4. Fixture seat; 5. Second connecting hole; 6. Connecting bolt; 7. Fixing pin; 8. Pressurizing pump; 9. Placement plate; 10. Fixed pressure roller; 11. Fixing groove; 12. Partition plate; 13. Piston plate; 14. Mounting plate; 15. Return spring; 16. Positioning groove; 17. Positioning protrusion; 18. Mounting seat; 19. Rotating shaft; 20. Connecting plate; 21. Threaded rod; 22. Slide rod; 23. Placement groove; 24. Moving block; 25. Lifting cylinder; 26. Frame plate; 27. Moving cavity; 28. Slide groove; 29. ​​Bidirectional screw; 30. Moving motor; 31. Driving gear; 32. Driven gear; 33. Push plate; 34. Track; 35. Support plate; 36. Roller; 37. Push groove; 38. Telescopic cylinder; 39. Push column.

[0020] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0021] The technical solutions in 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, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0022] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments.

[0023] See Figures 1-5In this embodiment, the present invention provides an electric vehicle frame welding device, including a base plate 1, multiple sets of clamp seats 4, connecting bolts 6, fixing pins 7, a pressure pump 8, a placement plate 9, and a fixing roller 10; the base plate 1 has a first connecting hole 2, and an air passage 3 is formed inside the base plate 1; the position of the clamp seats 4 on the base plate 1 is adjustable, and the electric vehicle frame is fixed at multiple points by the cooperation of multiple sets of clamp seats 4, which improves the accuracy and stability of the electric vehicle frame welding; the clamp seats 4 have a second connecting hole 5; the connecting bolts 6 are configured to pass through the first connecting hole 2 and the second connecting hole 5 to connect the clamp seats 4 to the base plate 1; the fixing pins 7 are configured to... The connecting bolt 6, which is slidably disposed in the air passage 3, is fixed in the second connecting hole 5. The pressurizing pump 8 is connected to the air passage 3 through a pipe. The pressurizing pump 8 applies a driving force to the fixing pin 7 to slide in the air passage 3 through the air passage 3, so as to control the fixing state of the fixing pin 7 to the connecting bolt 6. The placement plate 9 is used to place the metal tube of the frame. The fixing pressure roller 10 is configured to move relative to the placement plate 9. When the fixing pressure roller 10 moves to one side of the placement plate 9, it reserves space for the metal tube to be fed to the placement plate 9, so as to avoid the fixing pressure roller 10 blocking the placement plate 9 and affecting the feeding of the metal tube. When the fixing pressure roller 10 moves above the placement plate 9, it works with the placement plate 9 to clamp and fix the metal tube.

[0024] In practical use, according to the model and size of the electric vehicle frame to be welded, the clamp seat 4 is moved to the corresponding position on the base plate 1, so that the first connecting hole 2 and the second connecting hole 5 of the clamp seat 4 correspond. The connecting bolt 6 is inserted into the first connecting hole 2 and the second connecting hole 5 to achieve the connection between the clamp seat 4 and the base plate 1. Then, the air passage 3 is pressurized by the pressure pump 8. The air pressure drives the fixing pin 7 to slide within the air passage 3. The sliding fixing pin 7 approaches the connecting bolt 6 and fixes the connecting bolt 6. After fixing, the connecting bolt 6 can stably fix the clamp seat 4 and the base plate 1. The metal tubes to be welded are placed on the corresponding placement plates 9. If a metal tube needs to be fixed at multiple points, multiple placement plates 9 can be used to support the metal tube at multiple points. Then, the relative position of the fixing pressure roller 10 and the placement plate 9 is adjusted, and the fixing pressure roller 10 fixes the metal tubes on the placement plate 9. Finally, the fixed metal tubes are welded.

[0025] Specifically, see Figure 4 In this embodiment, a fixing groove 11 is provided on the side wall of the connecting bolt 6. The fixing groove 11 is adapted to the free end of the fixing pin 7. A partition 12 is fixedly provided in the air passage 3. The fixing pin 7 is slidably disposed on the partition 12. One end of the fixing pin 7 is provided with a piston plate 13. The other end of the fixing pin 7 is slidably disposed in the first connecting hole 2 through the side wall of the air passage 3. A mounting plate 14 is provided on the fixing pin 7. A return spring 15 is connected between the mounting plate 14 and the side wall of the air passage 3. The return spring 15 is sleeved on the fixing pin 7.

[0026] In practical use, initially, the mounting plate 14 is forced by the return spring 15, causing the mounting plate 14 to move the fixing pin 7 into the air passage 3. After the connecting bolt 6 is inserted into the first connecting hole 2 and the second connecting hole 5, the pressurizing pump 8 is started. The pressurizing pump 8 applies pressure to the piston plate 13, causing the piston plate 13 to move the fixing pin 7 on the partition plate 12. The free end of the fixing pin 7 penetrates the side wall of the air passage 3 and inserts into the fixing groove 11 of the connecting bolt 6, thus fixing the connecting bolt 6. During this process, the return spring 15 is compressed.

[0027] It is understandable that multiple sets of first connecting holes 2 are provided on the base plate 1. The multiple sets of first connecting holes 2 can meet the fixed installation of the clamp seat 4 in multiple positions. Multiple sets of fixing pins 7 are slidably provided in the air passage 3. The multiple sets of fixing pins 7 fix the connecting bolts 6 inserted in the multiple sets of first connecting holes 2 respectively.

[0028] Specifically, see Figure 4 In this embodiment, to improve the accurate correspondence between the fixing hole and the fixing pin 7 on the connecting bolt 6, one of the base plate 1 and the connecting bolt 6 is provided with a positioning groove 16, and the other is provided with a positioning protrusion 17. The positioning groove 16 and the positioning protrusion 17 are adapted to each other. When the connecting bolt 6 is inserted into the first connecting hole 2 and the second connecting hole 5, the positioning protrusion 17 is embedded into the positioning groove 16, so that the installation position of the connecting bolt 6 can be controlled, and the fixing groove 11 is oriented towards the fixing pin 7, thereby ensuring that the fixing pin 7 can be stably inserted into the fixing groove 11, and realizing the fixing of the connecting bolt 6 by the fixing pin 7.

[0029] Specifically, see Figure 6 In this embodiment, the placement plate 9 is provided with a mounting base 18, the mounting base 18 is rotatably provided with a rotating shaft 19, the rotating shaft 19 is fixedly provided with a connecting plate 20, the fixed pressure roller 10 is fixedly connected to the connecting plate 20, the mounting base 18 is provided with a first motor, and the rotating shaft 19 is connected to the output end of the first motor.

[0030] In use, the first motor drives the rotating shaft 19 to rotate. The rotating shaft 19 drives the fixed pressure roller 10 to rotate coaxially with the rotating shaft 19 through the connecting plate 20, adjusting the relative position of the fixed pressure roller 10 and the placement plate 9. When the fixed pressure roller 10 is removed from the placement plate 9, sufficient space can be reserved for the placement of the metal tube. After the metal tube is placed, the fixed pressure roller 10 is driven to swing back to above the placement plate 9, and the fixed pressure roller 10 presses and fixes the metal tube on the placement plate 9.

[0031] Specifically, see Figure 6In this embodiment, the distance between the mounting base 18 and the placement plate 9 is adjustable. By adjusting the position of the mounting base 18, the fixed pressure roller 10 is always pressed against the middle of the placement plate 9. A threaded rod 21 is threadedly connected to the placement plate 9. One end of the threaded rod 21 is rotatably connected to the mounting base 18. A sliding rod 22 is slidably provided on the placement plate 9. The sliding rod 22 is fixedly connected to the mounting base 18. By rotating the threaded rod 21, the distance between the mounting base 18 and the placement plate 9 can be adjusted under the driving action of the threaded rod 21 and the sliding guide action of the sliding rod 22.

[0032] In practical use, when pressing and fixing metal tubes of different diameters, the vertical distance between the fixing roller 10 and the placement plate 9 is different, that is, the included angle required for the rotating shaft 19 to rotate and rise is different. For ease of understanding, refer to... Figure 8 Assuming the rotation angle of the rotating shaft 19 is α, if the diameter of the metal tube is large, the required rotation angle α of the rotating shaft 19 is small, and the vertical distance between the fixed pressure roller 10 and the placement plate 9 is large; if the diameter of the metal tube is small, the required rotation angle α of the rotating shaft 19 is large, and the vertical distance between the fixed pressure roller 10 and the placement plate 9 is small. Regardless of whether the rotation angle is large or small, both situations will cause the fixed pressure roller 10 to press against a position biased towards one end of the placement plate 9, rather than pressing against the top of the placement plate 9, thus affecting the stability of the metal tube's pressing and fixing. Therefore, by adjusting the distance between the mounting base 18 and the placement plate 9 to adapt to different swing angles of the fixed pressure roller 10, the center of the fixed pressure roller 10 and the placement plate 9 are always aligned. For example, when fixing a small-diameter metal tube, the distance between the mounting base 18 and the placement plate 9 can be increased, and with the large-angle rotation of the rotating shaft 19, the fixed pressure roller 10 can press against the metal tube on the placement plate 9. When fixing a small-diameter metal tube, the distance between the mounting base 18 and the placement plate 9 can be reduced, and with the small-angle rotation of the rotating shaft 19, the fixed pressure roller 10 can press against the metal tube on the placement plate 9. In this way, the fixed pressure roller 10 can be vertically raised and lowered along the center line of the placement plate 9, and the pressing position of the fixed pressure roller 10 against the metal tube corresponds to the center of the placement plate 9, thereby improving the pressing and fixing stability of the fixed pressure roller 10 against the metal tube on the placement plate 9.

[0033] Specifically, see Figure 4 In this embodiment, a placement groove 23 is provided on the placement plate 9. The placement groove 23 is used to place the metal tube. The placement groove 23 has a V-shaped or U-shaped structure. The placement groove 23 is set in a V-shaped or U-shaped structure and, together with the fixed pressure roller 10, achieves three-point stable limiting and fixing of the metal tube.

[0034] Specifically, see Figure 4In this embodiment, the height of the mounting base 18 and the rotating shaft 19 is lower than the height of the bottom of the placement groove 23. The connecting plate 20 rotates and swings outside the placement plate 9. With the above position setting, when the rotating shaft 19 drives the fixed pressure roller 10 to adjust its position through the connecting plate 20, the movement trajectory of the connecting plate 20 and the fixed pressure roller 10 can be prevented from interfering with the position of the metal tube.

[0035] Specifically, see Figure 5 and Figure 8 In this embodiment, the fixture base 4 is provided with two sets of relatively movable blocks 24, the movable blocks 24 are provided with lifting cylinders 25, the free end of the lifting cylinders 25 is provided with a frame plate 26, the placement plate 9 is rotatably mounted on the frame plate 26, the frame plate 26 is provided with a second motor, and the placement plate 9 is connected to the output shaft of the second motor.

[0036] In practical use, the height of the placement plate 9 is adjusted by the lifting cylinder 25, and the angle of the placement plate 9 is adjusted by the second motor to meet the multi-point fixing requirements of metal tubes with different curved shapes.

[0037] Specifically, see Figure 7 In this embodiment, the fixture base 4 is provided with a movable cavity 27, and a sliding groove 28 is provided on the top wall of the movable cavity 27. A bidirectional screw 29 is rotatably provided in the movable cavity 27. Two sets of movable blocks 24 are respectively connected to the two ends of the bidirectional screw 29 by threads. The movable blocks 24 are engaged and slidably disposed in the sliding groove 28. A movable motor 30 is fixedly provided on the fixture base 4. A driving gear 31 is fixedly provided on the output shaft of the movable motor 30. A driven gear 32 is fixedly provided on the bidirectional screw 29. The driving gear 31 and the driven gear 32 mesh. Specifically, in this embodiment, both the driving gear 31 and the driven gear 32 are bevel gears.

[0038] In practical use, the frame is mostly symmetrical. The moving motor 30 drives the driving gear 31 to rotate. Through the meshing of the driving gear 31 and the driven gear 32, the bidirectional screw 29 is driven to rotate. The bidirectional screw 29 drives two sets of moving blocks 24 to move relative to each other. The two sets of moving blocks 24 drive the placement plate 9 and the fixed pressure roller 10 connected to them to move. The two sets of placement plates 9 fix the two ends of the symmetrical metal tube respectively.

[0039] Specifically, see Figure 1 and Figure 2In this embodiment, an electric vehicle frame welding device further includes a push plate 33, a track 34 on a base plate 1, two sets of support plates 35 fixed at both ends of a fixture seat 4, rollers 36 rotatably mounted on the support plates 35, the support plates 35 moving along the track 34 via the rollers 36, a push groove 37 on the support plates 35, the push plate 33 being configured to move above the support plates 35, a telescopic cylinder 38 on the push plate 33, a push column 39 at the free end of the telescopic cylinder 38, the push column 39 being adapted to the push groove 37, when the push column 39 is inserted into the push groove 37 of the support plate 35, the moving push plate 33 drives the set of support plates 35 to move on the track 34, thereby realizing the position adjustment of the fixture seat 4 on the base plate 1.

[0040] It should be noted that the movement of the push plate 33 can be driven by the lead screw and slide bar 22 drive mechanism. The lead screw and slide bar 22 drive mechanism is existing technology, specifically including a drive screw and a guide slide bar 22. The drive screw is driven to rotate by a motor. One end of the push plate 33 is threadedly connected to the drive screw, and the other end is slidably connected to the guide slide bar 22. Under the drive of the drive screw and the guidance of the guide slide bar 22, the position of the push plate 33 is adjusted. When the push plate 33 moves above the support plate 35 of a certain set of clamp seats 4, the push column 39 is driven to move down by the telescopic cylinder 38. The push column 39 is inserted into the push groove 37 of the support plate 35. When the push plate 33 is driven to move, it can drive the support plate 35, that is, the clamp seat 4, to move, thereby realizing the position adjustment of the clamp seat 4 on the base plate 1.

[0041] In practical use, after adjusting the positions of multiple sets of clamp seats 4, the distance between the two sets of moving blocks 24 is adjusted. Then, the height of the placement plate 9 is adjusted by the lifting cylinder 25, and the angle of the placement plate 9 is adjusted by the second motor. The metal tube of the frame is placed in the placement slot 23 of the placement plate 9. The first motor drives the rotating shaft 19 to rotate. The rotating shaft 19 drives the fixed pressure roller 10 to move along the arc path through the connecting plate 20. The fixed pressure roller 10 presses on the metal tube and fixes the position of the metal tube in conjunction with the placement plate 9.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. An electric vehicle frame welding device, characterized in that, include: The base plate (1) has an air passage (3) inside. The base plate (1) is provided with multiple adjustable clamp seats (4). The clamp seats (4) are connected to the base plate (1) by connecting bolts (6). The fixing pin (7) is slidably disposed in the air passage (3) to fix the connecting bolt (6); Placement plate (9) is used to place the metal tubes of the vehicle frame; The fixed pressure roller (10) is configured to move relative to the placement plate (9). When the fixed pressure roller (10) moves to one side of the placement plate (9), it reserves space for the metal tube to be fed to the placement plate (9). When the fixed pressure roller (10) moves above the placement plate (9), it clamps and fixes the metal tube together with the placement plate (9).

2. The electric vehicle frame welding device according to claim 1, characterized in that: The base plate (1) has a first connecting hole (2), and the clamp seat (4) has a second connecting hole (5). The connecting bolt (6) is configured to pass through the first connecting hole (2) and the second connecting hole (5) to connect the clamp seat (4) to the base plate (1).

3. The electric vehicle frame welding device according to claim 2, characterized in that: The side wall of the connecting bolt (6) is provided with a fixing groove (11), which is adapted to the free end of the fixing pin (7). A partition (12) is fixedly provided in the air passage (3). The fixing pin (7) is slidably disposed on the partition (12). One end of the fixing pin (7) is provided with a piston plate (13). The other end of the fixing pin (7) is slidably disposed in the first connecting hole (2) through the side wall of the air passage (3) to fix the connecting bolt (6) which is disposed in the second connecting hole (5). A mounting plate (14) is provided on the fixing pin (7). A return spring (15) is connected between the mounting plate (14) and the side wall of the air passage (3). The return spring (15) is sleeved on the fixing pin (7).

4. The electric vehicle frame welding device according to claim 1, characterized in that: One of the base plate (1) and the connecting bolt (6) is provided with a positioning groove (16), and the other is provided with a positioning protrusion (17), wherein the positioning groove (16) and the positioning protrusion (17) are adapted to each other.

5. The electric vehicle frame welding device according to claim 1, characterized in that: The placement plate (9) is provided with a mounting base (18), and a rotating shaft (19) is rotatably provided on the mounting base (18). A connecting plate (20) is fixedly provided on the rotating shaft (19), and the fixed pressure roller (10) is fixedly connected to the connecting plate (20).

6. The electric vehicle frame welding device according to claim 5, characterized in that: The distance between the mounting base (18) and the placement plate (9) is adjustable.

7. The electric vehicle frame welding device according to claim 6, characterized in that: The height of the mounting base (18) and the rotating shaft (19) is lower than the height of the bottom of the placement groove (23), and the connecting plate (20) rotates and swings outside the placement plate (9).

8. The electric vehicle frame welding device according to claim 1, characterized in that: The clamp seat (4) is provided with two sets of relatively movable blocks (24), and the movable blocks (24) are provided with lifting cylinders (25). The free end of the lifting cylinders (25) is provided with a frame plate (26), and the placement plate (9) is rotatably mounted on the frame plate (26).

9. The electric vehicle frame welding device according to claim 8, characterized in that: It also includes a push plate (33), a track (34) on the base plate (1), two sets of support plates (35) fixed at both ends of the clamp seat (4), rollers (36) rotatably mounted on the support plate (35), the support plate (35) moves along the track (34) via the rollers (36), a push groove (37) is opened on the support plate (35), the push plate (33) is configured to move above the support plate (35), a telescopic cylinder (38) is mounted on the push plate (33), a push column (39) is mounted on the free end of the telescopic cylinder (38), the push column (39) is adapted to the push groove (37), when the push column (39) is inserted into the push groove (37) of the support plate (35), the moving push plate (33) drives the set of support plates (35) to move on the track (34).

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