Electric servo control type plasma welding machine

Abstract

The invention discloses an electric servo control type plasma welding machine which comprises a base and a first movable frame, the top of the first movable frame is fixedly connected with a fixed frame, the outer portion of the fixed frame is rotationally connected with rolling wheels, the interior of the first movable frame is slidably connected with a second movable frame, and a transmission mechanism is arranged in the second movable frame. The transmission mechanism comprises a first rotating rod. Belongs to the technical field of welding equipment. According to the electric servo control type plasma welding machine, a shell of a third servo motor is started to be closed, a second servo motor is started to drive one of six third rotating rods to rotate, under the action of a bevel gear ring and a bevel gear, the other five third rotating rods also rotate synchronously, meanwhile, a first servo motor is started to drive a roller to rotate, and the other five third rotating rods rotate synchronously. And through cooperation with overall movement of the steel wire brush, the rolling wheels are comprehensively and automatically cleaned, compared with manual cleaning, the efficiency is higher, the speed is higher, meanwhile, the risk that the hands of workers are scratched by welding slag does not exist, and safety is higher.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and more specifically, to an electrically servo-controlled plasma welding machine. Background Technology

[0002] With the continuous development of industrial manufacturing, the demand for manufacturing large equipment is increasing. This involves the welding of large cylindrical sections. The main function of longitudinal seam welding of cylindrical sections is to connect two or more cylindrical sections into a whole to achieve the requirements of structural integrity and strength. In the manufacturing process of large equipment or components, the welding of cylindrical sections is a key link because the cylindrical sections are large in size and heavy in weight, and it is difficult to fix them through conventional connection methods. Through longitudinal seam welding, multiple cylindrical sections can be effectively connected together to form a stable and reliable equipment or component, which helps to improve the overall strength, stability and service life of the equipment.

[0003] Currently available longitudinal seam welding machines suffer from problems such as large footprint, the need to dig pits, and workers having to climb up and down daily. Most importantly, the rollers used to rotate the workpiece easily accumulate metal debris and welding slag on their surfaces during welding. Since the rollers are in direct contact with the workpiece, if these debris and slag are not cleaned promptly, they can scratch the workpiece surface during rotation, especially for high-precision workpieces such as stainless steel and precision pipes, leading to appearance defects or damage to the anti-corrosion layer. Furthermore, these metal debris and slag can cause the rollers to jam, resulting in uneven force on the workpiece during rotation, which can easily lead to workpiece slippage, tipping, and other safety accidents. Manual cleaning is slow, and workers are prone to hand injuries from welding slag during the process. Therefore, we provide an electrically powered servo-controlled plasma welding machine. Summary of the Invention

[0004] The purpose of this invention is to provide an electrically servo-controlled plasma welding machine to solve the problems mentioned in the background art. During the welding process, metal debris and welding slag easily accumulate on the surface of the rollers. Since the rollers are in direct contact with the workpiece, if the metal debris and welding slag attached to the roller surface are not cleaned in time, the hard objects will scratch the surface of the workpiece when it rotates, especially for workpieces with high requirements such as stainless steel and precision pipes, which can lead to appearance defects or damage to the anti-corrosion layer. At the same time, the metal debris and welding slag attached to the rollers can also cause the rollers to jam, and the workpiece may suddenly experience uneven force when rotating, which can easily cause the workpiece to slip or tip over and other safety accidents. Manual cleaning is relatively slow, and workers' hands are also easily cut by welding slag during the manual cleaning process.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An electric servo-controlled plasma welding machine includes a base and a first movable frame. A fixed frame is fixedly connected to the top of the first movable frame, and rollers are rotatably connected to the outside of the fixed frame. A second movable frame is slidably connected inside the first movable frame, and a transmission mechanism is provided inside the second movable frame. The transmission mechanism includes a first rotating rod, which is rotatably connected to the second movable frame. A first swing plate is fixedly connected to the outside of the first rotating rod. A cleaning mechanism is provided on the top of the second movable frame, and the cleaning mechanism works in conjunction with the rollers. The cleaning mechanism includes a second rotating rod, which is rotatably connected to the second movable frame. A rotating plate is fixedly connected to the outside of the second rotating rod, and a housing is fixedly connected to the outside of the rotating plate. A third rotating rod is rotatably connected inside the housing, and six wire brushes are fixedly connected to the outside of the third rotating rod. The wire brushes can clean the rollers from six different directions. With the rotation of the rollers themselves and the overall back-and-forth movement of the wire brushes, the rollers can be thoroughly cleaned.

[0006] Preferably, a lifting frame is fixedly installed on the top of the base, and an outer longitudinal seam welding platform is movably installed on the outside of the lifting frame. Depending on the diameter of the cylinder, the equipment can be lowered to the corresponding height without digging a pit, and workers do not need to climb to work every day. Maintenance is also convenient. A guide rail is fixedly installed on the outside of the base and below the outer longitudinal seam welding platform. A frame is slidably connected to the outside of the guide rail, and the first movable frame is slidably connected to the frame.

[0007] Preferably, there are two fixed frames. One of the fixed frames is externally fixedly connected to a first servo motor, and the roller is fixedly connected to the output end of the first servo motor. The first movable frame is internally rotatably connected to a lead screw. The second movable frame is sleeved on the outside of the lead screw and is threadedly connected to the lead screw. The first movable frame is externally fixedly connected to a third servo motor, and the lead screw is fixedly connected to the output end of the third servo motor.

[0008] Preferably, a first gear is fixedly connected to the outside of the first rotating rod, a worm gear is rotatably connected to the top of the second movable frame, and a second gear is fixedly connected to the bottom of the worm gear. The second gear meshes with the first gear. When the first rotating rod drives the first gear to rotate, the first gear can cooperate with the second gear to drive the worm gear to rotate. A worm wheel is fixedly connected to the outside of the second rotating rod, and the worm wheel meshes with the worm gear. The worm wheel drives the second rotating rod to rotate, and then the rotating plate drives the housing to open or close automatically.

[0009] Preferably, a bevel gear ring is slidably connected inside the housing, and a bevel gear is fixedly connected to the outside of the third rotating rod. The bevel gear meshes with the bevel gear ring. There are three third rotating rods in total, symmetrically distributed. There are two second rotating rods in total, symmetrically distributed. A rack is fixedly connected to the outside of the fixed frame, and a third gear is rotatably connected inside the second movable frame. The third gear meshes with the rack. Under the action of the bevel gear and the bevel gear ring, the third rotating rod is driven to rotate.

[0010] Preferably, a second swing plate is fixedly connected to the outside of the first swing plate. A sliding groove is formed inside the second swing plate, and a sliding rod is slidably connected inside the sliding groove. The sliding rod is fixedly connected to a third gear. Both the second swing plate and the sliding groove are arc-shaped structures. Under the action of the rack, when the second movable frame moves as a whole, the third gear on the second movable frame will rotate. The third gear drives the sliding rod to make a circular motion, so that the sliding rod squeezes the inner wall of the sliding groove. This causes the first rotating rod to rotate through the second swing plate and the first swing plate. Since both the second swing plate and the sliding groove are arc-shaped structures, when the center of the second swing plate coincides with the center of the third gear, the second swing plate, the first swing plate, and the first rotating rod will no longer rotate.

[0011] Preferably, the second movable frame has a sliding connection of a limiting rod inside, the limiting rod being fixedly connected to the fixed frame, and there are two limiting rods in total, which are symmetrically distributed to limit the movement of the second movable frame.

[0012] Preferably, the conical gear ring has a limiting groove inside, and a limiting plate is slidably connected inside the limiting groove. The limiting plate is fixedly connected to the housing. The cross-section of the limiting groove and the limiting plate is T-shaped. The housing, the conical gear ring, the limiting groove, and the limiting plate are all semi-circular ring structures. When the conical gear ring is completely retracted into the housing, the two housings can be freely opened and closed. When opened, the two housings are located on both sides of the roller and will not affect the normal operation of the roller. When closed, the two housings form an enclosing structure, so that the wire brush on the housing is pressed against the roller that needs to be cleaned. After the second servo motor is started, it can drive the wire brush to rotate.

[0013] Preferably, a second servo motor is fixedly connected to the outside of one of the housings. The output shaft of the second servo motor passes through the housing and extends into the interior of the housing. The output shaft of the second servo motor is rotatably connected to the housing. One of the third rotating rods is fixedly connected to the output end of the second servo motor. The second servo motor directly drives one of the six third rotating rods to rotate. Then, under the action of the bevel gear ring and bevel gear, it drives the other five third rotating rods to rotate synchronously. Finally, the third rotating rod drives the wire brush to rotate.

[0014] Preferably, a fixed rod is fixedly connected to the top of the second movable frame, and a baffle is fixedly connected to the top of the fixed rod. The two sides of the baffle are arc-shaped, and the curvature is adapted to the meshing area of ​​the worm and worm wheel, so as to maximize the coverage of key parts. The baffle is located above the worm and worm wheel, so it will not affect the normal operation of the worm and worm wheel, and can give full play to the blocking function.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1) When using this electric servo-controlled plasma welding machine, starting the third servo motor drives the lead screw to rotate forward. The lead screw drives the second movable frame to move towards the fixed frame on the other side. Through the rack and third gear, it drives the slide bar to press against the inner wall of the slide groove, thereby driving the second swing plate, the first swing plate, and the first rotating rod to rotate. The first gear drives the worm gear to rotate through the second gear. The worm gear drives the second rotating rod to rotate through the worm wheel. At this time, the second rotating rod drives the rotating plate to rotate upward. The rotating plate then drives the housing to close until the center of the second swing plate coincides with the center of the third gear. At this time, the slide bar stops pressing. The inner wall of the chute, the second swing plate, the first swing plate, and the first rotating rod cease to rotate, while the second movable frame continues to move until the wire brush on the housing contacts the roller. At this point, the second servo motor is activated, driving one of the six third rotating rods to rotate. Under the action of the bevel gear ring and bevel gear, the other five third rotating rods also rotate synchronously. Simultaneously, the first servo motor is activated, driving the roller to rotate. Combined with the overall movement of the wire brush, this achieves fully automatic cleaning of the roller. Compared to manual cleaning, this method is more efficient and faster, and there is no risk of workers' hands being cut by welding slag, making it safer.

[0016] 2) When using this electric servo-controlled plasma welding machine, the two housings can be opened and closed freely without affecting the normal operation of the rollers. When closed, the two housings form an enclosing structure, allowing the wire brush on the housing to press against the rollers that need cleaning. After the second servo motor is started, it drives the wire brush to rotate, thereby automatically cleaning the iron filings and welding slag on the rollers. When the rollers need cleaning, the third servo motor can be started to rotate forward. Cleaning and welding do not interfere with each other. When the two housings of the cleaning mechanism are in the open state, they are located on both sides of the rollers and do not contact the roller surface, so they do not affect the welding operation of the rollers rotating the workpiece. There is no need to limit the workpiece size or welding path due to the existence of the cleaning mechanism. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the vehicle frame structure of the present invention; Figure 3This is a schematic diagram of the structure of the housing of the present invention when it is closed; Figure 4 This is a schematic diagram of the structure of the housing of the present invention when it is opened; Figure 5 This is a schematic diagram of the baffle of the present invention; Figure 6 This is a schematic diagram of the structure of the second swing plate of the present invention; Figure 7 This is a schematic diagram of the structure of the wire brush of the present invention; Figure 8 This is a schematic diagram of the bevel gear ring of the present invention.

[0018] Explanation of the numbers in the diagram: 1. Base; 2. Lifting frame; 3. Outer longitudinal seam welding platform; 4. Guide rail; 5. Car frame; 6. First movable frame; 7. Fixed frame; 8. Roller; 9. First servo motor; 10. Lead screw; 11. Second movable frame; 12. Transmission mechanism; 1201. First rotating rod; 1202. First gear; 1203. Worm gear; 1204. Second gear; 1205. Third gear; 1206. First swing plate; 1207. Second swing plate; 12 08. Slide groove; 1209. Slide rod; 1210. Rack; 13. Cleaning mechanism; 1301. Second rotating rod; 1302. Worm gear; 1303. Rotating plate; 1304. Housing; 1305. Bevel gear ring; 1306. Third rotating rod; 1307. Bevel gear; 1308. Wire brush; 1309. Limiting groove; 1310. Limiting plate; 1311. Second servo motor; 14. Limiting rod; 15. Fixing rod; 16. Baffle; 17. Third servo motor. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1 to 8An electric servo-controlled plasma welding machine includes a base 1 and a first movable frame 6. A fixed frame 7 is fixedly connected to the top of the first movable frame 6, and rollers 8 are rotatably connected to the outside of the fixed frame 7. A second movable frame 11 is slidably connected inside the first movable frame 6. A transmission mechanism 12 is provided inside the second movable frame 11. The transmission mechanism 12 includes a first rotating rod 1201, which is rotatably connected to the second movable frame 11. A first swing plate 1206 is fixedly connected to the outside of the first rotating rod 1201. A cleaning mechanism 13 is provided on the top of the second movable frame 11. The cleaning mechanism 13 works in conjunction with the rollers 8 to clean the rollers. The roller 8 is automatically cleaned. The cleaning mechanism 13 includes a second rotating rod 1301, which is rotatably connected to the second movable frame 11. A rotating plate 1303 is fixedly connected to the outside of the second rotating rod 1301. A housing 1304 is fixedly connected to the outside of the rotating plate 1303. A third rotating rod 1306 is rotatably connected inside the housing 1304. A wire brush 1308 is fixedly connected to the outside of the third rotating rod 1306. There are a total of six wire brushes 1308, which can clean the roller 8 from six different directions. With the rotation of the roller 8 itself and the back-and-forth movement of the wire brushes 1308 as a whole, the roller 8 can be thoroughly cleaned.

[0021] Furthermore, a lifting frame 2 is fixedly installed on the top of the base 1, and an outer longitudinal seam welding platform 3 is movably installed on the outside of the lifting frame 2. Depending on the diameter of the cylinder, the equipment can be lowered to the corresponding height without digging a pit. Workers do not need to climb to work every day, and maintenance is also convenient. A guide rail 4 is fixedly installed on the outside of the base 1 and below the outer longitudinal seam welding platform 3. A frame 5 is slidably connected to the outside of the guide rail 4, and the first movable frame 6 is slidably connected to the frame 5.

[0022] Furthermore, there are two fixed frames 7. One fixed frame 7 is externally fixedly connected to a first servo motor 9, and the roller 8 is fixedly connected to the output end of the first servo motor 9. The first movable frame 6 is internally rotatably connected to a lead screw 10. The second movable frame 11 is sleeved on the outside of the lead screw 10 and is threadedly connected to the lead screw 10. The first movable frame 6 is externally fixedly connected to a third servo motor 17, and the lead screw 10 is fixedly connected to the output end of the third servo motor 17. The third servo motor 17 drives the lead screw 10 to rotate, and the lead screw 10 drives the second movable frame 11 to move.

[0023] Furthermore, a first gear 1202 is fixedly connected to the outside of the first rotating rod 1201, and a worm gear 1203 is rotatably connected to the top of the second movable frame 11. A second gear 1204 is fixedly connected to the bottom of the worm gear 1203. The second gear 1204 meshes with the first gear 1202. When the first rotating rod 1201 drives the first gear 1202 to rotate, the first gear 1202 can cooperate with the second gear 1204 to drive the worm gear 1203 to rotate. A worm wheel 1302 is fixedly connected to the outside of the second rotating rod 1301. The worm wheel 1302 meshes with the worm gear 1203. When the worm gear 1203 rotates, it can drive the second rotating rod 1301 to rotate through the worm wheel 1302. The second rotating rod 1301 then drives the housing 1304 to automatically open or close through the rotating plate 1303.

[0024] Furthermore, a bevel gear ring 1305 is slidably connected inside the housing 1304, and a bevel gear 1307 is fixedly connected to the outside of the third rotating rod 1306. The bevel gear 1307 meshes with the bevel gear ring 1305. There are three third rotating rods 1306, which are symmetrically distributed. There are two second rotating rods 1301, which are symmetrically distributed. A rack 1210 is fixedly connected to the outside of the fixed frame 7, and a third gear 1205 is rotatably connected inside the second movable frame 11. The third gear 1205 meshes with the rack 1210. Under the action of the bevel gear 1307 and the bevel gear ring 1305, the six third rotating rods 1306 in different positions can rotate simultaneously.

[0025] Furthermore, a second swing plate 1207 is fixedly connected to the outside of the first swing plate 1206. A groove 1208 is formed inside the second swing plate 1207, and a sliding rod 1209 is slidably connected inside the groove 1208. The sliding rod 1209 is fixedly connected to the third gear 1205. Both the second swing plate 1207 and the groove 1208 are arc-shaped structures. Under the action of the rack 1210, when the second movable frame 11 moves as a whole, the third gear 1205 on the second movable frame 11 will rotate, driving the sliding rod 1209... 209 makes a circular motion, causing the slide rod 1209 to press against the inner wall of the slide groove 1208, thereby driving the first rotating rod 1201 to rotate through the second swing plate 1207 and the first swing plate 1206. Since the second swing plate 1207 and the slide groove 1208 are both arc-shaped structures, when the center of the second swing plate 1207 coincides with the center of the third gear 1205, the second swing plate 1207, the first swing plate 1206 and the first rotating rod 1201 no longer rotate. At this time, the slide rod 1209 only slides within the slide groove 1208.

[0026] Furthermore, the second movable frame 11 has a sliding connection of a limiting rod 14 inside. The limiting rod 14 is fixedly connected to the fixed frame 7. There are two limiting rods 14, which are symmetrically distributed. The limiting rods 14 limit the second movable frame 11. When the lead screw 10 rotates, the lead screw 10 can drive the second movable frame 11 to move.

[0027] Furthermore, a limiting groove 1309 is formed inside the bevel gear ring 1305, and a limiting plate 1310 is slidably connected inside the limiting groove 1309. The limiting plate 1310 is fixedly connected to the housing 1304. The cross-sections of the limiting groove 1309 and the limiting plate 1310 are both T-shaped structures. The housing 1304, the bevel gear ring 1305, the limiting groove 1309, and the limiting plate 1310 are all semi-circular annular structures. When the bevel gear ring 1305 is completely retracted into the housing 1304, the two... The housing 1304 can be opened and closed freely. When opened, the two housings 1304 are located on both sides of the roller 8, which will not affect the normal operation of the roller 8. When closed, the two housings 1304 form an enclosing structure, so that the wire brush 1308 on the housing 1304 is pressed against the roller 8 that needs to be cleaned. After the second servo motor 1311 is started, it can drive the wire brush 1308 to rotate, thereby using the wire brush 1308 to automatically clean the iron filings and welding slag on the roller 8.

[0028] Furthermore, a second servo motor 1311 is fixedly connected to the outside of one of the housings 1304. The output shaft of the second servo motor 1311 passes through the housing 1304 and extends into the interior of the housing 1304. The output shaft of the second servo motor 1311 is rotatably connected to the housing 1304. One of the third rotating rods 1306 is fixedly connected to the output end of the second servo motor 1311. The second servo motor 1311 directly drives one of the six third rotating rods 1306 to rotate. Then, under the action of the bevel gear ring 1305 and the bevel gear 1307, it drives the other five third rotating rods 1306 to rotate synchronously. Finally, the third rotating rod 1306 drives the wire brush 1308 to rotate, and the wire brush 1308 automatically cleans the iron filings and welding slag on the roller 8.

[0029] Furthermore, a fixed rod 15 is fixedly connected to the top of the second movable frame 11, and a baffle 16 is fixedly connected to the top of the fixed rod 15. The two sides of the baffle 16 are arc-shaped, and the curvature is adapted to the meshing area of ​​the worm gear 1203 and the worm wheel 1302, which can maximize the coverage of key parts. The baffle 16 is located above the worm gear 1203 and the worm wheel 1302, which will not affect the normal operation of the worm gear 1203 and the worm wheel 1302, and can also play a blocking role. When the wire brush 1308 automatically cleans the roller 8, the iron filings and welding slag that are cleaned off will be directly blocked by the baffle 16, preventing the iron filings and welding slag from falling into the meshing gap of the worm gear 1203 and the worm wheel 1302 and avoiding jamming.

[0030] The usage steps of this invention are as follows: When using this electric servo-controlled plasma welding machine, initially, the housing 1304 is in an open state, located on both sides of the rollers 8 and close to one of the fixed frames 7, without affecting the normal operation of the rollers 8. When cleaning of the rollers 8 is required, first start the third servo motor 17 to drive the lead screw 10 to rotate forward. The lead screw 10 drives the second movable frame 11 to move towards the other fixed frame 7. During this process, under the action of the rack 1210, the third gear 1205 on the second movable frame 11 will rotate. 05 will cause the slide bar 1209 to perform circular motion, causing the slide bar 1209 to press against the inner wall of the slide groove 1208, thereby causing the second swing plate 1207, the first swing plate 1206, and the first rotating rod 1201 to rotate. The first rotating rod 1201 then drives the first gear 1202 to rotate, and the first gear 1202 drives the worm gear 1203 to rotate through the second gear 1204. The worm gear 1203 drives the second rotating rod 1301 to rotate through the worm wheel 1302. At this time, the second rotating rod 1301 causes the rotating plate 1303 to rotate upward. The rotating plate 1303 drives the housing 1304 to close until the second swing plate 1207 rotates until its center coincides with the center of the third gear 1205. At this point, the slide rod 1209 no longer presses against the inner wall of the slide groove 1208, and the second swing plate 1207, the first swing plate 1206, and the first rotating rod 1201 also stop rotating. However, the second movable frame 11 continues to move until the wire brush 1308 on the housing 1304 contacts the roller 8, activating the second servo motor 1311 to drive the six third rotating rods 1306. With one rotation, under the action of the bevel gear ring 1305 and bevel gear 1307, the other five third rotating rods 1306 also rotate synchronously. At the same time, the first servo motor 9 is started to drive the roller 8 to rotate. With the overall movement of the wire brush 1308, the roller 8 is fully and automatically cleaned. Compared with manual cleaning, it is more efficient and faster. At the same time, the workers' hands will not be cut by welding slag, which is safer. After the wire brush 1308 has swept the entire roller 8, the third servo motor 17 drives the lead screw 10 to reverse and drive the whole system to reset.

[0031] 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.

Claims

1. An electrically powered servo-controlled plasma arc welder comprising a base (1) and a first movable carriage (6), characterised in that: The top of the first movable frame (6) is fixedly connected with a fixed frame (7), the outer part of the fixed frame (7) is rotatably connected with a roller (8), the inner part of the first movable frame (6) is slidably connected with a second movable frame (11), the inner part of the second movable frame (11) is provided with a transmission mechanism (12), the transmission mechanism (12) comprises a first rotating rod (1201), the first rotating rod (1201) is rotatably connected with the second movable frame (11), the outer part of the first rotating rod (1201) is fixedly connected with a first swing plate (1206), the top of the second movable frame (11) is provided with a cleaning mechanism (13), the cleaning mechanism (13) comprises a second rotating rod (1301), the second rotating rod (1301) is rotatably connected with the second movable frame (11), the outer part of the second rotating rod (1301) is fixedly connected with a rotating plate (1303), the outer part of the rotating plate (1303) is fixedly connected with a shell (1304), the inner part of the shell (1304) is rotatably connected with a third rotating rod (1306), the outer part of the third rotating rod (1306) is fixedly connected with a steel wire brush (1308).

2. The electrically powered servo-controlled plasma arc welder of claim 1 wherein: The top of the base (1) is fixedly provided with a lifting frame (2), the outer part of the lifting frame (2) is movably provided with an outer longitudinal seam welding platform (3), the outer part of the base (1) and below the outer longitudinal seam welding platform (3) is fixedly provided with a guide rail (4), the outer part of the guide rail (4) is slidably provided with a vehicle frame (5), the first movable frame (6) is slidably connected with the vehicle frame (5). ​ 3. The electrically powered servo-controlled plasma arc welder of claim 1 wherein: The outer part of one of the two fixed frames (7) is fixedly provided with a first servo motor (9), the roller (8) is fixedly connected with the output end of the first servo motor (9), the inner part of the first movable frame (6) is rotatably provided with a lead screw (10), the second movable frame (11) is sleeved on the outer part of the lead screw (10), the second movable frame (11) is threadedly connected with the lead screw (10), the outer part of the first movable frame (6) is fixedly provided with a third servo motor (17), the lead screw (10) is fixedly connected with the output end of the third servo motor (17).

4. The electrically powered servo-controlled plasma arc welder of claim 1 wherein: The outer part of the first rotating rod (1201) is fixedly provided with a first gear (1202), the top of the second movable frame (11) is rotatably provided with a worm (1203), the bottom of the worm (1203) is fixedly provided with a second gear (1204), the second gear (1204) is meshedly connected with the first gear (1202), the outer part of the second rotating rod (1301) is fixedly provided with a worm wheel (1302), the worm wheel (1302) is meshedly connected with the worm (1203).

5. The electrically powered servo-controlled plasma arc welder of claim 1 wherein: the controller is further programmed to: monitor the current through the plasma arc torch; and adjust the current through the plasma arc torch to maintain a constant current through the plasma arc torch. The inside of the shell (1304) is slidably connected with a bevel gear (1305), the outside of the third rotating rod (1306) is fixedly connected with a bevel gear (1307), the bevel gear (1307) is meshedly connected with the bevel gear (1305), the third rotating rod (1306) is shared by three, the three third rotating rods (1306) are symmetrically distributed, the second rotating rod (1301) is shared by two, the two second rotating rods (1301) are symmetrically distributed, the outside of the fixed frame (7) is fixedly connected with a rack (1210), the inside of the second movable frame (11) is rotatably connected with a third gear (1205), and the third gear (1205) is meshedly connected with the rack (1210).

6. The electrically powered servo-controlled plasma arc welder of claim 1 wherein: The outside of the first swing plate (1206) is fixedly connected with a second swing plate (1207), the inside of the second swing plate (1207) is provided with a sliding groove (1208), the inside of the sliding groove (1208) is slidably connected with a sliding rod (1209), the sliding rod (1209) is fixedly connected with the third gear (1205), and the second swing plate (1207) and the sliding groove (1208) are both circular arc structures.

7. The electrically powered servo-controlled plasma arc welder of claim 1 wherein: The inside of the second movable frame (11) is slidably connected with a limiting rod (14), the limiting rod (14) is fixedly connected with the fixed frame (7), and the limiting rod (14) is shared by two, and the two limiting rods (14) are symmetrically distributed.

8. The electrically powered servo-controlled plasma arc welder of claim 5 wherein: The inside of the bevel gear (1305) is provided with a limiting groove (1309), the inside of the limiting groove (1309) is slidably connected with a limiting plate (1310), the limiting plate (1310) is fixedly connected with the shell (1304), the limiting groove (1309) and the limiting plate (1310) are both T-shaped structures in cross section, and the shell (1304), the bevel gear (1305), the limiting groove (1309) and the limiting plate (1310) are all semi-circular ring structures.

9. The electrically powered servo-controlled plasma arc welder of claim 1 wherein: The outside of one of the shells (1304) is fixedly connected with a second servo motor (1311), the output shaft of the second servo motor (1311) penetrates through the shell (1304) and extends into the inside of the shell (1304), the output shaft of the second servo motor (1311) is rotatably connected with the shell (1304), and one of the third rotating rods (1306) is fixedly connected with the output end of the second servo motor (1311).

10. The electrically powered servo-controlled plasma arc welder of claim 1 wherein: The top of the second movable frame (11) is fixedly connected with a fixed rod (15), and the top of the fixed rod (15) is fixedly connected with a baffle (16).

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