Vehicle frame plasma arc welding equipment with stable clamping function

Abstract

The invention belongs to metal processing equipment, particularly relates to the field of frame welding, and discloses frame plasma arc welding equipment with a stable clamping function, which comprises a base, a first clamping plate is slidably connected in a sliding rail, and a second clamping plate is fixed at the top of the sliding rail. Rubber pads are fixed to the first clamping plate and the second clamping plate, electric telescopic rods are fixed to the periphery of the upper end face of the base, movable plates are fixed to the inner ends of the electric telescopic rods, mechanical arms are fixed to the four corners of the upper end face of the base, and plasma welding machines are fixed to the tail ends of the mechanical arms. According to the vehicle frame plasma arc welding equipment with the stable clamping function, a workpiece can be clamped by using a first clamping plate and a second clamping plate in a matched mode, then a sleeve moves upwards, a second friction pad and a first friction pad abut against each other, a second oil cylinder is conveniently locked, then a moving plate extrudes a first movable block, and the first clamping plate independently moves by a small distance; and the clamping effect is more stable.

Description

Technical Field

[0001] This invention pertains to metal processing equipment, and more specifically to the field of vehicle frame welding, and more specifically to a vehicle frame plasma arc welding equipment with a stable clamping function. Background Technology

[0002] Plasma arc welding is a welding method that uses a plasma arc as a heat source to melt the joint between two metals. It includes AC plasma arc welding, micro-beam plasma arc welding, reverse polarity plasma arc welding, pulsed plasma arc welding, and consumable electrode plasma arc welding. Its advantages are that within a certain thickness range, the workpiece can be welded without beveling or leaving gaps, and single-sided welding can achieve double-sided forming. In addition, the arc is stable, the heat is concentrated, the heat-affected zone is small, the deformation is small, and the productivity is high. It can be used for welding vehicle frames.

[0003] Existing plasma arc welding equipment typically uses clamps to hold and fix the workpiece before welding. However, the clamping effect is generally poor and the locking effect is insufficient, resulting in an unstable welding process. To address these issues, existing equipment needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to provide a vehicle frame plasma arc welding device with stable clamping function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a vehicle frame plasma arc welding equipment with stable clamping function, including a base, with clamping mechanisms fixed around the upper surface of the base, the clamping mechanism including a slide rail, a first clamping plate slidably connected inside the slide rail, a second clamping plate fixed to the top of the slide rail, and rubber pads fixed to both the first and second clamping plates.

[0006] Electric telescopic rods are fixed around the upper surface of the base. A movable plate is fixed to the inner end of the electric telescopic rod. A robotic arm is fixed to each of the four corners of the upper surface of the base. A plasma welding machine is fixed to the end of the robotic arm.

[0007] Preferably, a first tension spring is fixed on an inner wall of the slide rail, and the first clamping plate is fixed to the outer end of the first tension spring.

[0008] By adopting the above technical solution, the workpiece can be clamped and fixed by using the first clamping plate and the second clamping plate.

[0009] Preferably, a first hydraulic cylinder is fixed around the upper surface of the base, and a first piston is slidably connected inside the first hydraulic cylinder. A first movable block is fixed to the outer end face of the first piston, and the first movable block passes through the outer side of the first hydraulic cylinder.

[0010] By adopting the above technical solution, when the first movable block is squeezed, it will drive the first piston to move, which facilitates the outward pressure of oil.

[0011] Preferably, a second oil cylinder is fixed to the outer end of the slide rail, and the second oil cylinder is connected to the first oil cylinder through a first elastic connecting pipe. A second piston is slidably connected inside the second oil cylinder, and the second piston is connected to an inner wall of the second oil cylinder through a first compression spring. The second piston passes through the inner end of the second oil cylinder and is connected to a first clamping plate. A slot is provided at the bottom of the second oil cylinder, and a first friction pad is fixed at the bottom of the second oil cylinder.

[0012] By adopting the above technical solution, when the first movable block and the first piston are squeezed and move, the second piston and the first clamping plate move as a whole.

[0013] Preferably, a second groove is provided in the outer wall of the slide rail, and a second tension spring is fixed at the bottom of the second groove. A sleeve is fixed at the top of the second tension spring, and the sleeve is slidably connected in the second groove. A second friction pad is fixed at the top of the sleeve.

[0014] By adopting the above technical solution, the second oil cylinder can be locked by using the first friction pad and the second friction pad together.

[0015] Preferably, a second compression spring is fixed to the inner bottom of the sleeve, and a locking block is fixed to the top of the second compression spring. The locking block passes through the second friction pad and is engaged in the slot.

[0016] By adopting the above technical solution, the locking block can be used to lock the second hydraulic cylinder.

[0017] Preferably, a limiting post is fixed at the bottom of the sleeve, and the limiting post passes through the bottom of the slide rail. The bottom of the locking block is connected to the pulling block by a connecting rope, and the connecting rope passes through the bottom of the sleeve and the limiting post. A limiting rod is fixed on the outer end face of the pulling block, and the limiting rod is slidably connected to the inner end face of the limiting post.

[0018] By adopting the above technical solution, when the pull block is squeezed and moves horizontally, the locking block will move under the pulling action of the connecting rope and unlock the second hydraulic cylinder.

[0019] Preferably, a third hydraulic cylinder is fixed around the upper surface of the base, and a third piston is slidably connected inside the third hydraulic cylinder. A second movable block is fixed to the inner end face of the third piston, and the second movable block passes through the inner side of the third hydraulic cylinder.

[0020] By adopting the above technical solution, oil can be drawn into the third cylinder when the second movable block and the third piston are squeezed and moved.

[0021] Preferably, a fourth hydraulic cylinder and a limiting sleeve are fixed around the upper surface of the base, and the fourth hydraulic cylinder passes through the limiting sleeve. The fourth hydraulic cylinder is connected to the third hydraulic cylinder through a second elastic connecting pipe, and a third movable block and a pressing block are fixed on the top two sides of the fourth hydraulic cylinder, respectively. The pressing block is wedge-shaped and fitted onto the pulling block.

[0022] By adopting the above technical solution, the extrusion block is used to extrude the pulling block.

[0023] Preferably, a fourth piston is slidably connected inside the fourth cylinder, and the fourth piston passes through the inner end of the fourth cylinder and is connected to the hook rod. A slide rail is provided at the bottom of the slide rail, and the hook rod passes through the slide rail.

[0024] By adopting the above technical solution, the hook rod is used to pull the first clamping plate.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. This frame plasma arc welding equipment with stable clamping function can achieve stable clamping. After the workpiece is placed on the slide rail and positioned between the first clamping plate and the second clamping plate, the moving plate moves and first presses the third movable block. The locking block releases the second hydraulic cylinder, the first tension spring returns to its original position from the tensioned state, and the second hydraulic cylinder and the first clamping plate move automatically. The first clamping plate and the second clamping plate work together to clamp the workpiece. Then the sleeve moves up, and the second friction pad abuts against the first friction pad to lock the second hydraulic cylinder. Then the moving plate presses the first movable block again, and the first clamping plate moves a short distance separately, making the clamping effect more stable.

[0027] 2. This frame plasma arc welding equipment with stable clamping function can automatically release the workpiece and lock the clamping parts. After two adjacent workpieces are put together, they can be welded using a plasma welding machine. The robotic arm can position the plasma welding machine. After the entire welding operation is completed, the moving plate releases the pressure on the third movable block. Then the moving plate moves and presses the second movable block. The hook rod pulls the first clamping plate and the second hydraulic cylinder to move. The second hydraulic cylinder is finally locked by the locking block. The first clamping plate completely releases the workpiece, making it convenient for workers to pick up the material. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 This is a front view structural diagram of the present invention;

[0030] Figure 3 This is a schematic diagram of the clamping mechanism of the present invention;

[0031] Figure 4 This is a front view cross-sectional structural diagram of the clamping mechanism of the present invention;

[0032] Figure 5 This is a partial three-dimensional structural diagram of the clamping mechanism of the present invention;

[0033] Figure 6 For the present invention Figure 1 Enlarged structural diagram at point A in the middle;

[0034] Figure 7 For the present invention Figure 2 Enlarged structural diagram at point B;

[0035] Figure 8 For the present invention Figure 3 Enlarged structural diagram at point C.

[0036] In the diagram: 1. Base; 2. Clamping mechanism; 201. Slide rail; 202. First tension spring; 203. First clamping plate; 204. Second clamping plate; 205. Rubber pad; 206. First hydraulic cylinder; 207. First piston; 208. First movable block; 209. First elastic connecting pipe; 210. Second hydraulic cylinder; 211. Second piston; 212. First compression spring; 213. Slot; 214. First friction pad; 215. Second groove; 216. Second tension spring; 217. Sleeve; 218. Second... 219. Friction pad; 220. Second compression spring; 221. Locking block; 222. Limiting post; 223. Connecting rope; 224. Pulling block; 225. Limiting rod; 226. Third hydraulic cylinder; 227. Second movable block; 228. Second elastic connecting pipe; 229. Fourth hydraulic cylinder; 230. Limiting sleeve; 231. Third movable block; 232. Pressing block; 233. Fourth piston; 234. Hook rod; 235. Slide rail; 3. Electric telescopic rod; 4. Moving plate; 5. Robotic arm; 6. Plasma welding machine. Detailed Implementation

[0037] 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.

[0038] Please see Figures 1 to 8 The present invention provides a technical solution: a vehicle frame plasma arc welding equipment with stable clamping function, including a base 1, and clamping mechanisms 2 are fixed around the upper surface of the base 1. The clamping mechanism 2 includes a slide rail 201, a first clamping plate 203 is slidably connected in the slide rail 201, and a second clamping plate 204 is fixed on the top of the slide rail 201. Rubber pads 205 are fixed on both the first clamping plate 203 and the second clamping plate 204.

[0039] Electric telescopic rods 3 are fixed around the upper surface of the base 1. A movable plate 4 is fixed to the inner end of the electric telescopic rods 3. Mechanical arms 5 are fixed to the four corners of the upper surface of the base 1. A plasma welding machine 6 is fixed to the end of the mechanical arm 5.

[0040] In this embodiment, as Figure 1 , Figure 3 and Figure 5 As shown, a first tension spring 202 is fixed on an inner wall of the slide rail 201, and a first clamping plate 203 is fixed to the outer end of the first tension spring 202. The first tension spring 202 is initially in a stretched state. During the clamping process, the first clamping plate 203 first springs open and then moves a small distance. The first clamping plate 203 and the second clamping plate 204 can be used together to clamp and fix the workpiece.

[0041] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a first hydraulic cylinder 206 is fixed around the upper surface of the base 1, and a first piston 207 is slidably connected inside the first hydraulic cylinder 206. A first movable block 208 is fixed to the outer end face of the first piston 207, and the first movable block 208 passes through the outer side of the first hydraulic cylinder 206. When the first movable block 208 is squeezed and moves, the first movable block 208 and the first piston 207 move as a whole, which facilitates the removal of hydraulic oil in the first hydraulic cylinder 206.

[0042] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a second hydraulic cylinder 210 is fixed to the outer end of the slide rail 201, and the second hydraulic cylinder 210 is connected to the first hydraulic cylinder 206 through a first elastic connecting pipe 209. A second piston 211 is slidably connected inside the second hydraulic cylinder 210, and the second piston 211 is connected to an inner wall of the second hydraulic cylinder 210 through a first compression spring 212. The second piston 211 passes through the inner end of the second hydraulic cylinder 210 and is connected to the first clamping plate 203. A slot 213 is provided at the bottom of the second hydraulic cylinder 210, and a first friction pad 214 is fixed at the bottom of the second hydraulic cylinder 210. The first elastic connecting pipe 209 serves to connect the first hydraulic cylinder 206 and the second hydraulic cylinder 210. After the second hydraulic cylinder 210 is unlocked, the second hydraulic cylinder 210 and the first clamping plate 203 move as a whole under the action of the first tension spring 202. Then the first movable block 208 is squeezed, the first piston 207 slides inside the second hydraulic cylinder 210, and the first clamping plate 203 moves a small distance, making the clamping effect more secure.

[0043] In this embodiment, as Figure 3 , Figure 7 and Figure 8 As shown, a second groove 215 is provided in the outer wall of the slide rail 201, and a second tension spring 216 is fixed at the bottom of the second groove 215. A sleeve 217 is fixed at the top of the second tension spring 216, and the sleeve 217 is slidably connected in the second groove 215. A second friction pad 218 is fixed at the top of the sleeve 217. When the sleeve 217 moves upward and the second friction pad 218 abuts against the first friction pad 214, the second oil cylinder 210 can be locked.

[0044] In this embodiment, as Figure 3 , Figure 7 and Figure 8 As shown, a second compression spring 219 is fixed to the inner bottom of the sleeve 217, and a locking block 220 is fixed to the top of the second compression spring 219. The locking block 220 passes through the second friction pad 218 and is engaged in the slot 213. When the locking block 220 is engaged in the slot 213, it can lock the second oil cylinder 210. When the locking block 220 is pulled down and moves away from the slot 213, it can unlock the second oil cylinder 210.

[0045] In this embodiment, as Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, a limiting post 221 is fixed to the bottom of the sleeve 217, and the limiting post 221 passes through the bottom of the slide rail 201. The bottom of the locking block 220 is connected to the pull block 223 via a connecting rope 222, and the connecting rope 222 passes through the bottom of the sleeve 217 and the limiting post 221. A limiting rod 224 is fixed to the outer end face of the pull block 223, and the limiting rod 224 is slidably connected to the inner end face of the limiting post 221. When the pull block 223 is squeezed, it first moves horizontally, at which point the locking block... Under the pulling action of the connecting rope 222, 220 moves downward and leaves the slot 213, which facilitates the unlocking of the first hydraulic cylinder 206. The first hydraulic cylinder 206 and the first clamping plate 203 move as a whole, which facilitates clamping the workpiece. After the clamping block 220 moves down to the bottom, when the pull block 223 is pressed further, the pull block 223 moves upward, thereby driving the limiting post 221 and the sleeve 217 to move upward. The second friction pad 218 abuts against the first friction pad 214, which facilitates the locking effect.

[0046] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, a third oil cylinder 225 is fixed around the upper surface of the base 1, and a third piston 226 is slidably connected inside the third oil cylinder 225. A second movable block 227 is fixed to the inner end face of the third piston 226, and the second movable block 227 passes through the inner side of the third oil cylinder 225. When the moving plate 4 moves and squeezes the second movable block 227, the second movable block 227 and the third piston 226 move as a whole, which facilitates the extraction of oil into the third oil cylinder 225.

[0047] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, a fourth hydraulic cylinder 229 and a limiting sleeve 230 are fixed around the upper surface of the base 1. The fourth hydraulic cylinder 229 passes through the limiting sleeve 230 and is connected to the third hydraulic cylinder 225 through the second elastic connecting pipe 228. A third movable block 231 and a pressing block 232 are fixed on the top two sides of the fourth hydraulic cylinder 229, respectively. The pressing block 232 is wedge-shaped and fitted onto the pull block 223. The moving plate 4 is located between the second movable block 227 and the third movable block 231. When the moving plate 4 presses the third movable block 231 to move, the fourth hydraulic cylinder 229 moves accordingly. The limiting sleeve 230 supports and limits the fourth hydraulic cylinder 229. The pressing block 232 presses the pull block 223. The second elastic connecting pipe 228 connects the third hydraulic cylinder 225 and the fourth hydraulic cylinder 229. When the second movable block 227 and the third piston 226 are pressed and move, the hydraulic oil in the fourth hydraulic cylinder 229 can be drawn into the third hydraulic cylinder 225.

[0048] In this embodiment, as Figure 3 and Figure 4 As shown, a fourth piston 233 is slidably connected inside the fourth cylinder 229, and the fourth piston 233 passes through the inner end of the fourth cylinder 229 and is connected to the hook rod 234. A slide rail 235 is provided at the bottom of the slide rail 201, and the hook rod 234 passes through the slide rail 235. When the second movable block 227 and the third piston 226 are squeezed and moved, the fourth piston 233 moves, and the hook rod 234 slides in the slide rail 235, so as to hook the first clamping plate 203 to move, so as to completely release the workpiece.

[0049] The method of use and advantages of this invention: The working process of this plasma arc welding equipment for vehicle frames with stable clamping function is as follows:

[0050] like Figures 1 to 8As shown: Slide rails 201 are distributed around the upper surface of the base 1, and three slide rails 201 are set as a group. Each group of slide rails 201 can hold one workpiece. When placing the workpiece on the slide rail 201, the workpiece needs to be positioned between the first clamping plate 203 and the second clamping plate 204. The first tension spring 202 is initially in a stretched state. After the material is loaded, the electric telescopic rod 3 extends, the moving plate 4 moves and presses the third movable block 231. The third movable block 231, the fourth hydraulic cylinder 229, and the pressing block 232 move as a whole. The pressing block 232 presses the pulling block 223. The pulling block 223 first... The locking block 220 moves downward and away from the locking slot 213 under the pulling action of the connecting rope 222, thereby unlocking the second hydraulic cylinder 210. The second hydraulic cylinder 210 and the first clamping plate 203 spring open under the action of the first tension spring 202. The first clamping plate 203 and the second clamping plate 204 can be used together to clamp the workpiece. When the locking block 220 moves to the bottom, the pressing block 232 continues to press the pulling block 223, the pulling block 223 moves upward, the limiting post 221 and the sleeve 217 move upward, the second friction pad 218 abuts against the first friction pad 214, and the second hydraulic cylinder 210 is released. After locking, the moving plate 4 presses against the first movable block 208, causing the first movable block 208 and the first piston 207 to move as a whole. The second piston 211 slides within the second oil cylinder 210, and the first clamping plate 203 continues to move a short distance, thus achieving a stable clamping effect. After completing the clamping and docking operation of two adjacent workpieces, the plasma welding machine 6 can be used for welding. During the welding process, the robotic arm 5 can be used to position the plasma welding machine 6. After completing the entire welding operation, the workpiece can be released, the electric telescopic rod 3 retracts, and the moving plate 4 moves back, thereby releasing the first movable block 208. The moving block 208 and the third movable block 231 are pressed together. Then the moving plate 4 continues to move and press the second movable block 227. The second movable block 227 and the third piston 226 move as a whole. The fourth piston 233 and the hook rod 234 move as a whole. The hook rod 234 pulls the first clamping plate 203 and the second oil cylinder 210 to move as a whole, thereby completely releasing the workpiece. The locking block 220 finally locks into the locking groove 213 and relocks the second oil cylinder 210. Then the moving plate 4 moves and releases the pressure on the second movable block 227. Finally, the hook rod 234 is manually slid and moved away from the first clamping plate 203.

[0051] In summary, this plasma arc welding equipment for vehicle frames with stable clamping function achieves the purpose of stable clamping and automatic release of workpieces and locking of clamped parts, thus meeting people's usage needs.

[0052] 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 preferred examples and are not intended to limit 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.

[0053] The terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention 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 limiting the scope of protection of the present invention.

[0054] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vehicle frame plasma arc welding device with stable clamping function, comprising a base (1), characterized in that: The base (1) has a clamping mechanism (2) fixed around its upper surface. The clamping mechanism (2) includes a slide rail (201), a first clamping plate (203) is slidably connected inside the slide rail (201), and a second clamping plate (204) is fixed on the top of the slide rail (201). Rubber pads (205) are fixed on both the first clamping plate (203) and the second clamping plate (204). Electric telescopic rods (3) are fixed around the upper surface of the base (1). A movable plate (4) is fixed at the inner end of the electric telescopic rods (3). Mechanical arms (5) are fixed at the four corners of the upper surface of the base (1). A plasma welding machine (6) is fixed at the end of the mechanical arm (5).

2. The plasma arc welding equipment for vehicle frames with stable clamping function according to claim 1, characterized in that: A first tension spring (202) is fixed on one inner wall of the slide rail (201), and the first clamping plate (203) is fixed to the outer end of the first tension spring (202).

3. The plasma arc welding equipment for vehicle frames with stable clamping function according to claim 1, characterized in that: The base (1) is fixed with a first oil cylinder (206) around its upper surface, and a first piston (207) is slidably connected inside the first oil cylinder (206). A first movable block (208) is fixed to the outer end face of the first piston (207), and the first movable block (208) passes through the outer side of the first oil cylinder (206).

4. The plasma arc welding equipment for vehicle frames with stable clamping function according to claim 3, characterized in that: The outer end of the slide rail (201) is fixed with a second oil cylinder (210), and the second oil cylinder (210) is connected to the first oil cylinder (206) through a first elastic connecting pipe (209). A second piston (211) is slidably connected inside the second oil cylinder (210), and the second piston (211) is connected to an inner wall of the second oil cylinder (210) through a first compression spring (212). The second piston (211) passes through the inner end of the second oil cylinder (210) and is connected to the first clamping plate (203). A slot (213) is provided at the bottom of the second oil cylinder (210), and a first friction pad (214) is fixed at the bottom of the second oil cylinder (210).

5. The plasma arc welding equipment for vehicle frames with stable clamping function according to claim 1, characterized in that: The slide rail (201) has a second groove (215) inside its outer wall, and a second tension spring (216) is fixed at the bottom of the second groove (215). A sleeve (217) is fixed at the top of the second tension spring (216), and the sleeve (217) is slidably connected in the second groove (215). A second friction pad (218) is fixed at the top of the sleeve (217).

6. The plasma arc welding equipment for vehicle frames with stable clamping function according to claim 5, characterized in that: The inner bottom of the sleeve (217) is fixed with a second compression spring (219), and the top of the second compression spring (219) is fixed with a locking block (220). The locking block (220) passes through the second friction pad (218) and is engaged in the slot (213).

7. The plasma arc welding equipment for vehicle frames with stable clamping function according to claim 6, characterized in that: The bottom of the sleeve (217) is fixed with a limiting post (221), and the limiting post (221) passes through the bottom of the slide rail (201). The bottom of the locking block (220) is connected to the pull block (223) by a connecting rope (222), and the connecting rope (222) passes through the bottom of the sleeve (217) and the limiting post (221). The outer end face of the pull block (223) is fixed with a limiting rod (224), and the limiting rod (224) is slidably connected to the inner end face of the limiting post (221).

8. The plasma arc welding equipment for vehicle frames with stable clamping function according to claim 1, characterized in that: The base (1) has a third oil cylinder (225) fixed around its upper surface, and a third piston (226) is slidably connected inside the third oil cylinder (225). The inner end face of the third piston (226) is fixed with a second movable block (227), and the second movable block (227) passes through the inner side of the third oil cylinder (225).

9. A plasma arc welding device for vehicle frames with stable clamping function according to claim 8, characterized in that: The fourth oil cylinder (229) and the limiting sleeve (230) are fixed around the upper surface of the base (1), and the fourth oil cylinder (229) passes through the limiting sleeve (230). The fourth oil cylinder (229) is connected to the third oil cylinder (225) through the second elastic connecting pipe (228). The third movable block (231) and the pressing block (232) are fixed on the top two sides of the fourth oil cylinder (229), respectively. The pressing block (232) is wedge-shaped and attached to the pull block (223).

10. A plasma arc welding device for vehicle frames with stable clamping function according to claim 9, characterized in that: The fourth piston (233) is slidably connected inside the fourth cylinder (229), and the fourth piston (233) passes through the inner end of the fourth cylinder (229) and is connected to the hook rod (234). The bottom of the slide rail (201) is provided with a slide track (235), and the hook rod (234) passes through the slide track (235).

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