Plasma arc welding equipment

Abstract

The invention discloses plasma arc welding equipment, which belongs to the technical field of welding, and comprises a working plate, an arc welding nozzle, a welding area, a support plate, a movable cavity metal and a triangular block, by arranging the welding area and the supporting plate, a to-be-welded workpiece can be rapidly limited after being put in, when the triangular block moves upwards to the position with the same height as the supporting plate, multi-point supporting can be provided for the workpiece, then the stability and precision in the welding process are improved, and when the triangular block moves downwards and is in linkage with the supporting plate to retract into the moving cavity, the workpiece can be rapidly welded. On one hand, dust accumulation can be prevented from influencing the welding quality, and on the other hand, a workpiece can slide to the top of the triangular block, so that hard collision detection is carried out on the welded workpiece, a special detection link is omitted, and the detection accuracy and comprehensiveness are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding, and in particular relates to a plasma arc welding device. Background Art

[0002] Plasma arc welding is a processing method that uses the heat energy of a plasma arc to weld metals or non-metals. 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 to weld refractory, easily oxidized, and heat-sensitive materials, such as molybdenum, tungsten, beryllium, chromium, tantalum, nickel, titanium and their alloys, stainless steel, etc. However, traditional welding equipment usually relies on mechanical jigs or manual positioning, and additional operations are required to align and fix the workpieces. This design not only makes the limiting process time-consuming and reduces production efficiency, but also has a relatively single function, only having a limiting function and being inconvenient for detecting the welded workpieces. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a plasma arc welding device that can overcome or at least partially solve the above problems.

[0004] To solve the above technical problem, the basic concept of the technical solution adopted by the present invention is: a plasma arc welding device, including a work plate and an arc welding nozzle movably arranged above the work plate, and further including a welding area opened on the work plate. A pair of support plates are connected to the inner wall of the welding area. When the support plates are slidably connected to the work plate, a moving cavity for accommodating the support plates is provided inside the work plate. A triangular block linked to the support plates is provided below the center of the welding area. When the triangular block moves upward and enters the welding area, the two support plates slide from the corresponding moving cavities to the inner wall of the welding area and fit together. At the same time, the tops of the two support plates and the top of the triangular block are on the same horizontal plane. When the triangular block moves downward and exits the welding area, the two support plates retract into the corresponding moving cavities. At the same time, a preset gap space is formed between the triangular block and the bottom of the work plate.

[0005] Preferably, a plurality of support rods are fixedly connected to the top of the work plate, and a top plate is fixedly connected between the tops of the support rods. A first driving part is vertically installed on the top plate. The output end of the first driving part is fixedly connected to a lifting plate that slides along the surface of the support rod. A pair of vertical plates are fixedly connected to the bottom of the lifting plate. A second driving part is installed on one of the vertical plates. The output end of the second driving part is connected to a threaded rod rotatably arranged between the two vertical plates. An L-shaped bracket is threadedly connected to the threaded rod. The arc welding nozzle is vertically installed on the L-shaped bracket.

[0006] Preferably, a guide rod is fixedly connected between the two vertical plates, and the L-shaped bracket is slidably connected to the guide rod.

[0007] Preferably, an L-shaped fixing rod is fixedly connected to one side of the L-shaped bracket. An expansion cavity is provided inside the L-shaped fixing rod. A moving block is slidably connected to the inner wall of the expansion cavity. A extending rod is fixedly connected to the bottom of the moving block. The end of the extending rod passing through the outside of the L-shaped fixing rod is fixedly connected to a concave-shaped bracket. A first spring sleeved on the extending rod is fixedly connected between the top of the concave-shaped bracket and the bottom end of the L-shaped fixing rod. A connecting shaft is rotatably arranged on the concave-shaped bracket, and a roller is fixedly connected to the connecting shaft.

[0008] Preferably, a pair of concave grooves are provided on the top of the working plate, and the concave grooves communicate with the welding area.

[0009] Preferably, an adjustment box is provided below the bottom of the triangular block. A moving plate is slidably connected to the inner wall of the adjustment box. A plurality of ejector rods are fixedly connected to the top of the moving plate. A second spring sleeved on the ejector rods is fixedly connected between the top of the moving plate and the top wall of the adjustment box. The end of the ejector rod passing through the top of the adjustment box is fixedly connected to the bottom of the triangular block. A third driving part is fixedly connected to the bottom wall of the adjustment box.

[0010] Preferably, when the third driving part is an electromagnet, the moving plate is made of iron plate.

[0011] Preferably, a plurality of first air pipes are connected to the adjustment box. The end of the first air pipe connected to the inside of the adjustment box corresponds to the upper area inside the adjustment box. The other end of the first air pipe communicates with the inside of the moving cavity. A pushing plate that fits the inner wall of the moving cavity is fixedly connected to the corresponding side of the support plate inside the moving cavity. A plurality of third springs are fixedly connected between the pushing plate and the side wall of the moving cavity. The elastic force of the third spring is less than that of the second spring, and the number of the third springs is less than that of the second springs.

[0012] Preferably, a plurality of second air pipes are connected to the adjustment box. The end of the second air pipe connected to the inside of the adjustment box corresponds to the lower area inside the adjustment box. The other end of the second air pipe communicates with a blowing plate. The output end of the blowing plate is located above the gap of the welding workpiece. The blowing plate is fixedly connected to the lifting plate. The second air pipe is a flexible pipe structure.

[0013] Preferably, a bottom plate is fixedly connected to the bottom of the adjustment box. A plurality of vertical brackets are fixedly connected between the bottom plate and the top of the working plate.

[0014] After adopting the above technical solutions, the present invention has the following beneficial effects compared with the prior art:

[0015] 1. By setting the welding area and the support plate, the workpiece to be welded can be directly placed in the welding area to quickly complete the positioning, without additional operations, saving the time for separate positioning operations, significantly accelerating the speed of the coincidence positioning of the two welded workpieces, and improving the production efficiency.

[0016] 2. By moving the triangular block upward to the same horizontal plane as the tops of the two support plates, a stable multi-point support is provided for the welded workpiece placed in the welding area, thereby improving the welding stability and precision.

[0017] 3. By moving the triangular block downward, the two support plates are linked to retract into the moving cavity. In this way, on the one hand, it can prevent dust accumulation on the support plates from causing subsequent workpieces to be placed unevenly and affecting the welding quality. On the other hand, when the support plates retract into the interior of the moving cavity, the welded workpiece can slide along the inner wall of the welding area to the top of the triangular block for hard collision detection. This not only saves the subsequent dedicated detection link and improves the production efficiency, but also, compared with elastic collision, this hard collision detection can more directly expose the areas with poor welding quality, improving the accuracy and comprehensiveness of the detection.

[0018] 4. Before the collision detection, during the process of the moving plate sliding down along the inner wall of the adjustment box, the gas in the adjustment box can be introduced into the blowing plate through the air delivery pipe to blow air on the welding part for cooling, accelerating the cooling speed, shortening the cooling time, improving the production efficiency, and at the same time avoiding the influence of high temperature on the detection result and ensuring the accuracy of the welding quality detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the drawings:

[0020] Figure 1 is a schematic diagram of the connection structure between the support plate and the welding area of a plasma arc welding device proposed by the present invention;

[0021] Figure 2 is a schematic diagram of the connection structure between the welding area of a plasma arc welding device proposed by the present invention and the placement of the workpiece to be welded;

[0022] Figure 3 For the present invention Figure 2 is a partially enlarged schematic diagram of part A in;

[0023] Figure 4 For the present invention Figure 1 is a schematic diagram of the structure of the arc welding spray head in;

[0024] Figure 5 For the present invention Figure 4 is a sectional view schematic diagram of the L-shaped fixing rod in;

[0025] Figure 6 For the present invention Figure 1 is a first connection structure schematic diagram between the triangular block and the welding area in;

[0026] Figure 7 For the present invention Figure 6 Schematic explosion structure diagram of the connection between the middle support plate and the working plate;

[0027] Figure 8 For the present invention Figure 1 Schematic diagram of the second connection structure between the triangular block and the welding area;

[0028] Figure 9 For the present invention Figure 8 Schematic diagram of the connection structure between the moving plate and the third driving part.

[0029] In the figure:

[0030] 1. Working plate; 11. Welding area; 12. Moving cavity; 13. Concave groove;

[0031] 2. Arc welding nozzle; 21. Support rod; 22. Top plate; 23. First driving part; 24. Lifting plate; 25. Vertical plate; 26. Second driving part; 27. Threaded rod; 28. L-shaped bracket; 29. Guide rod; 210. L-shaped fixing rod; 211. Telescopic cavity; 212. Moving block; 213. Extension rod; 214. Concave bracket; 215. First spring; 216. Connecting shaft; 217. Drum;

[0032] 3. Support plate; 4. Triangular block; 41. Adjusting box; 42. Moving plate; 43. Jacking rod; 44. Second spring; 45. Third driving part; 46. First air delivery pipe; 47. Pushing plate; 48. Third spring; 49. Second air delivery pipe; 410. Air blowing plate; 411. Bottom plate; 412. Vertical support. Specific embodiments

[0033] The following further describes the present invention in detail with reference to the drawings and embodiments, so that those skilled in the art can implement it according to the description in the specification.

[0034] It should be understood that terms such as "having", "including" and "comprising" as used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0035] In the description of the present invention, the orientation or positional relationship indicated by terms such as "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0036] Example 1: Refer to Figures 1 - 4, a plasma arc welding device, including a working plate 1 and an arc welding nozzle 2 movably arranged above the working plate 1, further including a welding area 11 opened on the working plate 1, and a pair of support plates 3 are arranged at the inner wall of the welding area 11.

[0037] In this embodiment, the shape of the welding area 11 is square, and its size is set according to the size after two workpieces to be welded overlap. During use, the two workpieces to be welded are placed from the top of the welding area 11 and supported on the tops of the two support plates 3. In this way, the two overlapping welded workpieces can be closely attached to the inner wall of the welding area 11. Such a design not only ensures the stability of the placement of the two welded workpieces, but also speeds up the speed of overlapping and limiting the two welded workpieces. Because only by directly placing the welded workpieces on the two support plates 3 of the welding area 11, the limiting can be quickly completed without setting an additional limiting contact mechanism, saving the time of separate limiting operation. After the two workpieces to be welded are placed and limited, finally, drive the arc welding nozzle 2 to move down to the welding height corresponding to one side of the gap between the two workpieces to be welded, and slowly move and weld to the other side of the gap.

[0038] Refer to Figure 2 and Figure 4 , to realize the movement of the arc welding nozzle 2 in the above technical solution, a plurality of support rods 21 are fixedly connected to the top of the working plate 1, a top plate 22 is fixedly connected between the tops of the support rods 21, a first driving part 23 is vertically installed on the top plate 22, the output end of the first driving part 23 is fixedly connected with a lifting plate 24 sliding along the surface of the support rod 21, a pair of vertical plates 25 are fixedly connected to the bottom of the lifting plate 24, a second driving part 26 is installed on one of the vertical plates 25, the output end of the second driving part 26 is connected with a threaded rod 27 rotatably arranged between the two vertical plates 25, an L-shaped bracket 28 is threadedly connected to the threaded rod 27, the arc welding nozzle 2 is vertically installed on the L-shaped bracket 28, a guide rod 29 is fixedly connected between the two vertical plates 25, and the L-shaped bracket 28 is slidably connected to the guide rod 29. During use, by starting the first driving part 23 using a cylinder to push the lifting plate 24 to slide down along the surfaces of the four support rods 21, the arc welding nozzle 2 is lowered to the preset height of the gap between the workpieces to be welded. Subsequently, start the second driving part 26 using a servo motor to drive the threaded rod 27 to rotate. Under the limiting action of the guide rod 29, the L-shaped bracket 28 threadedly connected to the threaded rod 27 can stably drive the arc welding nozzle 2 to slowly move from one side of the welded workpiece to the other side, so as to realize the welding at the gap between the two workpieces.

[0039] Refer to Figure 4 and Figure 5, to further improve the stability of the workpiece placed in the welding area 11 during the welding operation in cooperation with the arc welding nozzle 2, an L-shaped fixing rod 210 is fixedly connected to one side of the L-shaped bracket 28. An expansion cavity 211 is provided inside the L-shaped fixing rod 210. A moving block 212 is slidably connected to the inner wall of the expansion cavity 211. A extending rod 213 is fixedly connected to the bottom of the moving block 212. The end of the extending rod 213 passing through the outside of the L-shaped fixing rod 210 is fixedly connected to a concave-shaped bracket 214. A first spring 215 sleeved on the extending rod 213 is fixedly connected between the top of the concave-shaped bracket 214 and the bottom end of the L-shaped fixing rod 210. A connecting shaft 216 is rotatably provided on the concave-shaped bracket 214. A roller 217 is fixedly connected to the connecting shaft 216. During use, since the installation position of the arc welding nozzle 2 on the L-shaped bracket 28 is higher than the initial position of the roller 217, before the arc welding nozzle 2 descends to the preset height of the gap between the workpieces to be welded, the roller 217 will first contact the tops of the two welding workpieces. As the arc welding nozzle 2 continues to move downward, the roller 217 will squeeze the first spring 215 through the concave-shaped bracket 214, causing the extending rod 213 on the top of the concave-shaped bracket 214 to drive the moving block 212 to slide along the inner wall of the expansion cavity 211 until the arc welding nozzle 2 is adjusted to the appropriate welding distance. Through such a design, during the process of the arc welding nozzle 2 slowly moving from one side of the welding workpiece to the other side, the roller 217 always remains in contact with the top of the workpiece under the action of the first spring 215, stably limiting the welding workpiece, thereby helping to improve the welding quality at the gap between the two workpieces.

[0040] Refer to Figure 6 , to facilitate the picking and placing of the two workpieces to be welded at the welding area 11, a pair of concave grooves 13 are provided on the top of the workbench 1. The concave grooves 13 are communicated with the welding area 11. Through the opening design of the concave grooves 13, the workpiece can slide into or out of the welding area 11 from the side. Especially after welding is completed, the workpiece can be quickly taken out, effectively reducing the operation time.

[0041] Embodiment 2: Refer to Figure 6 and Figure 7 , on the basis of the above-mentioned Embodiment 1, when the support plate 3 is slidably connected to the workbench 1, a moving cavity 12 for accommodating the support plate 3 is provided inside the workbench 1. A triangular block 4 linked to the support plate 3 is provided below the center of the welding area 11. Through such a design, when the triangular block 4 moves upward and enters the welding area 11, the two support plates 3 slide from the corresponding moving cavities 12 to the inner wall of the welding area 11 and fit together. At the same time, the tops of the two support plates 3 and the top of the triangular block 4 are on the same horizontal plane, thereby providing a stable multi-point support for the welding workpiece placed at the welding area 11, significantly improving the stability and accuracy during the welding process.

[0042] Refer to Figure 8 andFigure 9 , after the welding of two workpieces is completed, when the triangular block 4 moves downward and exits the welding area 11, the two support plates 3 retract into the corresponding moving cavities 12. With such a design, it can prevent the support plates 3 from accumulating dust due to long-term exposure, avoid the situation of uneven heights when placing workpieces subsequently, and thus affect the welding quality. At the same time, during this process, a preset gap space is formed between the bottom of the triangular block 4 and the bottom of the working plate 1. That is to say, after the two support plates 3 retract into the moving cavities 12, the welded workpiece, after losing the support of the support plates 3, will slide downward along the inner wall of the welding area 11 and fall on the top of the triangular block 4, thereby detecting the collision of the welded workpiece. If the quality of the welded workpiece is qualified, it will not break; if it is unqualified, it will break. This design eliminates the subsequent dedicated detection link and improves the production efficiency.

[0043] Referring to Figures 6 - 9 , to achieve the function that the support plate 3 can respond simultaneously according to the up and down movement of the triangular block 4 in the above technical solution, an adjustment box 41 is provided below the bottom of the triangular block 4. A moving plate 42 is slidably connected to the inner wall of the adjustment box 41. A plurality of ejector rods 43 are fixedly connected to the top of the moving plate 42. A second spring 44 sleeved on the ejector rods 43 is fixedly connected between the top of the moving plate 42 and the top wall of the adjustment box 41. One end of the ejector rod 43 passing through the top of the adjustment box 41 is fixedly connected to the bottom of the triangular block 4. A third driving part 45 is fixedly connected to the bottom wall of the adjustment box 41. When the third driving part 45 is an electromagnet, the moving plate 42 is made of iron plate material. A plurality of first air pipes 46 are communicated with the adjustment box 41. The end of the first air pipe 46 communicated inside the adjustment box 41 corresponds to the upper region inside the adjustment box 41. The other end of the first air pipe 46 is communicated with the inside of the moving cavity 12. A pushing plate 47 that fits with the inner wall of the moving cavity 12 is fixedly connected to the corresponding side of the support plate 3 inside the moving cavity 12. A plurality of third springs 48 are fixedly connected between the pushing plate 47 and the side wall of the moving cavity 12. The elastic force of the third spring 48 is less than the elastic force of the second spring 44, and the number of the third springs 48 is less than the number of the second springs 44. A bottom plate 411 is fixedly connected to the bottom of the adjustment box 41. A plurality of vertical brackets 412 are fixedly connected between the bottom plate 411 and the top of the working plate 1.

[0044] In the above technical solution, after the workpiece is welded, the third driving part 45 using an electromagnet is started, so that the third driving part 45 adsorbs the moving plate 42 made of iron plate. Subsequently, the moving plate 42 will slide along the inner wall of the adjustment box 41, and at the same time stretch the second spring 44 until the moving plate 42 is adsorbed on the third driving part 45. During the process of the moving plate 42 moving downward, the moving plate 42 will drive the triangular block 4 to fit on the top of the adjustment box 41. At this time, due to the gas pressurized by the upward movement of the adjustment box 41 in the moving cavity 12 before, after the moving plate 42 moves downward, these gases return to the upper area inside the adjustment box 41 through the first air pipe 46. At this time, the support plate 3 retracts into the moving cavity 12 under the action of the elastic reset of the third spring 48, so that the welded workpiece at the welding area 11 falls onto the triangular block 4 for collision detection.

[0045] When it is necessary to continue welding the welded workpiece subsequently, the third driving part 45 is driven to disconnect the adsorption of the moving plate 42. At this time, the moving plate 42 slides upward along the inner wall of the adjustment box 41 under the action of the elastic reset of the second spring 44, and the ejector rod 43 drives the triangular block 4 into the welding area 11 accordingly. During the process of the moving plate 42 sliding upward along the inner wall of the adjustment box 41, the gas in the upper area inside the adjustment box 41 will enter the moving cavity 12 through the first air pipe 46, which is used to drive the push plate 47 to slide along the inner wall of the moving cavity 12, so that the support plate 3 slides from the inside of the moving cavity 12 to the inner wall of the welding area 11 to fit, so as to place and support the workpiece to be welded subsequently.

[0046] It should be noted that after the moving plate 42 is adsorbed by the third driving part 45, the triangular block 4 generates a hard collision with the welded workpiece, rather than an elastic collision. This hard collision can achieve a more ideal detection effect for the welded workpiece under specific detection requirements than an elastic collision.

[0047] During the hard collision process, the triangular block 4 comes into contact with the welded workpiece instantly and applies a large impact force. Since the collision time is extremely short and the energy transfer is rapid and concentrated, the stress distribution borne by the welded workpiece at the moment of collision is more definite and concentrated. For detecting the bonding strength of the welding part, a hard collision can more directly expose the areas with poor welding quality. For example, when there are defects such as incomplete welding or slag inclusion at the welding part, under the huge impact force generated by the hard collision, cracks, fractures and other phenomena are more likely to occur at these defective parts, thus more intuitively showing the problems existing in the welding quality.

[0048] In contrast, during an elastic collision, there is a buffering process between the triangular block 4 and the welded workpiece. The collision force is gradually applied and released. During this process, part of the energy is stored and released in the form of elastic potential energy, resulting in a relatively dispersed stress distribution on the welded workpiece and a smaller impact force. This makes it possible that some minor welding defects, such as tiny pores and lack of fusion, may not be immediately revealed during an elastic collision, thus affecting the accuracy and comprehensiveness of detection.

[0049] Embodiment 3: Referring to Figure 1 、 Figure 2 and Figure 9 , on the basis of the above Embodiment 2, a plurality of second air pipes 49 are connected to the adjustment box 41. One end of the second air pipe 49 connected to the inside of the adjustment box 41 corresponds to the lower area inside the adjustment box 41. The other end of the second air pipe 49 is connected to a blowing plate 410. The output end of the blowing plate 410 is located above the gap of the welded workpiece. The blowing plate 410 is fixedly connected to the lifting plate 24. The second air pipe 49 is of a flexible hose structure. When the moving plate 42 slides along the inner wall of the adjustment box 41 and before contacting the third driving part 45, the gas in the lower area inside the adjustment box 41 will be introduced into the blowing plate 410 through the second air pipe 49. In this way, before the completed welded workpiece falls onto the triangular block 4 for collision detection, the blowing plate 410 can blow air to cool the welding area. This design can accelerate the natural cooling speed of the welding area of the welded workpiece, shorten the workpiece cooling time, and improve production efficiency. At the same time, after being cooled by blowing air, the temperature of the welded workpiece decreases. When it subsequently falls onto the triangular block 4 for collision detection, it will not affect the detection equipment or lead to inaccurate detection results due to high temperature. Moreover, the structure of the cooled workpiece is more stable, which is more conducive to accurately detecting the welding quality.

[0050] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content to obtain equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A plasma arc welding device, comprising: A working plate (1) and an arc welding nozzle (2) movably arranged above the working plate (1), characterized in that it further comprises: A welding area (11) opened on the working plate (1), and a pair of support plates (3) are connected to the inner wall of the welding area (11); When the support plate (3) is slidably connected to the working plate (1), a moving cavity (12) for accommodating the support plate (3) is provided inside the working plate (1), and a triangular block (4) linked to the support plate (3) is provided below the center of the welding area (11); When the triangular block (4) moves upward and enters the welding area (11), the two support plates (3) slide from the inside of the corresponding moving cavity (12) to the inner wall of the welding area (11) and fit together. At the same time, the tops of the two support plates (3) are on the same horizontal plane as the top of the triangular block (4); When the triangular block (4) moves downward and exits the welding area (11), the two support plates (3) retract into the corresponding moving cavity (12) inside. At the same time, a preset gap space is formed between the triangular block (4) and the bottom of the working plate (1).

2. The plasma arc welding device according to claim 1, characterized in that, A plurality of support rods (21) are fixedly connected to the top of the working plate (1), a top plate (22) is fixedly connected between the tops of the support rods (21), a first driving part (23) is vertically installed on the top plate (22), the output end of the first driving part (23) is fixedly connected with a lifting plate (24) sliding along the surface of the support rod (21), a pair of vertical plates (25) are fixedly connected to the bottom of the lifting plate (24), a second driving part (26) is installed on one of the vertical plates (25), the output end of the second driving part (26) is connected with a threaded rod (27) rotatably arranged between the two vertical plates (25), an L-shaped bracket (28) is threadedly connected to the threaded rod (27), and the arc welding nozzle (2) is vertically installed on the L-shaped bracket (28).

3. A plasma arc welding device according to claim 2, characterized in that, A guide rod (29) is fixedly connected between the two vertical plates (25), and the L-shaped bracket (28) is slidably connected to the guide rod (29).

4. A plasma arc welding device according to claim 2, characterized in that, An L-shaped fixing rod (210) is fixedly connected to one side of the L-shaped bracket (28), a telescopic cavity (211) is provided inside the L-shaped fixing rod (210), a moving block (212) is slidably connected to the inner wall of the telescopic cavity (211), a extending rod (213) is fixedly connected to the bottom of the moving block (212), the extending rod (213) penetrates through one end outside the L-shaped fixing rod (210) and is fixedly connected with a concave-shaped bracket (214), a first spring (215) sleeved on the extending rod (213) is fixedly connected between the top of the concave-shaped bracket (214) and the bottom end of the L-shaped fixing rod (210), a connecting shaft (216) is rotatably arranged on the concave-shaped bracket (214), and a roller (217) is fixedly connected to the connecting shaft (216).

5. A plasma arc welding device according to claim 1, characterized in that, A pair of concave grooves (13) are provided on the top of the working plate (1), and the concave grooves (13) communicate with the welding area (11).

6. An arc plasma welding device according to claim 2, characterized in that, Below the bottom of the triangular block (4) is provided an adjustment box (41). A moving plate (42) is slidably connected to the inner wall of the adjustment box (41). The top of the moving plate (42) is fixedly connected with a plurality of ejector rods (43). A second spring (44) sleeved on the ejector rods (43) is fixedly connected between the top of the moving plate (42) and the top wall of the adjustment box (41). One end of the ejector rod (43) passing through the top of the adjustment box (41) is fixedly connected to the bottom of the triangular block (4). The bottom wall of the adjustment box (41) is fixedly connected with a third driving part (45).

7. An arc plasma welding apparatus according to claim 6, characterized in that, When the third driving part (45) is an electromagnet, the moving plate (42) is made of iron plate material.

8. An arc plasma welding device according to claim 6, characterized in that, A plurality of first air pipes (46) are communicated with the adjustment box (41). One end of the first air pipe (46) communicated inside the adjustment box (41) corresponds to the upper area inside the adjustment box (41). The other end of the first air pipe (46) is communicated with the inside of the moving cavity (12). One side of the support plate (3) corresponding to the inside of the moving cavity (12) is fixedly connected with a push plate (47) that fits the inner wall of the moving cavity (12). A plurality of third springs (48) are fixedly connected between the push plate (47) and the side wall of the moving cavity (12). The elastic force of the third spring (48) is less than the elastic force of the second spring (44), and the number of the third springs (48) is less than the number of the second springs (44).

9. A plasma arc welding device according to claim 6, characterized in that, A plurality of second air pipes (49) are communicated with the adjustment box (41). One end of the second air pipe (49) communicated with the inside of the adjustment box (41) corresponds to the lower area inside the adjustment box (41). The other end of the second air pipe (49) is communicated with a blowing plate (410). The output end of the blowing plate (410) is corresponding to the upper part of the gap of the welding workpiece. The blowing plate (410) is fixedly connected to the lifting plate (24). The second air pipe (49) is of a flexible pipe structure.

10. A plasma arc welding device according to claim 6, characterized in that, The bottom of the adjustment box (41) is fixedly connected with a bottom plate (411). A plurality of vertical brackets (412) are fixedly connected between the bottom plate (411) and the top of the working plate (1).

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