Plasma arc welding device for circular tube

Abstract

The invention relates to the technical field of circular tube welding, in particular to a circular tube plasma arc welding device which comprises a bottom plate and further comprises a positioning mechanism, a welding mechanism, a polishing mechanism and an extraction mechanism, the positioning mechanism comprises two fixing frames and two electric clamping jaws, and the welding mechanism comprises a welding gun, a rotating ring, a rotating assembly and a moving assembly. The grinding mechanism comprises an L-shaped plate, a Z-shaped plate, a grinding block, a lifting assembly, a telescopic assembly and a transmission assembly, the extraction mechanism comprises an air draft fan blade, a storage assembly and a plurality of suction nozzles, the welding gun, a rotating ring, a rotating assembly and a moving assembly are arranged, the height of the welding gun can be adjusted through the moving assembly, the welding gun can be close to a round pipe needing to be welded, and the welding efficiency is improved. And meanwhile, the rotating assembly can drive the welding gun to rotate around the outer walls of the circular pipes, and plasma arc welding of the ends of the two circular pipes is achieved.

Description

Technical Field

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

[0002] Plasma arc welding refers to a fusion welding method that uses the high energy density beam of a plasma arc as a welding heat source. When processing round tubes, it is usually necessary to weld two round tubes together. During welding, plasma arc welding is usually used. Plasma arc welding has the advantages of fast welding speed, low heat input and small deformation, which can meet the welding needs of round tubes.

[0003] In the prior art, when round tubes are transported or stored, they are exposed to the outside for a long time, and an oxide layer will form on their surface. The oxide layer will block the direct bonding of the base metal, hinder the stability of the arc and the welding quality during the welding process, weaken the welding strength, and lead to unstable welding. It is impossible to remove the oxide layer from the welding area while welding. To address this problem, a round tube plasma arc welding device is now provided. Summary of the Invention

[0004] The object of the present invention is to provide a circular tube plasma arc welding device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A circular tube plasma arc welding device comprises a base plate, a positioning mechanism, a welding mechanism, a grinding mechanism and an extraction mechanism; The positioning mechanism includes two fixing frames and two electric clamping jaws; The welding mechanism includes a welding gun, a rotating ring, a rotating assembly and a moving assembly. The rotating assembly is installed at the top middle part of the base plate, the rotating ring is installed at one side of the rotating assembly, the moving assembly is fixed to the surface of the rotating ring, and the welding gun is installed on the moving assembly. The grinding mechanism includes an L-shaped plate, a Z-shaped plate, a grinding block, a lifting assembly, a telescopic assembly, and a transmission assembly. The L-shaped plate is located on one side of the welding gun and is fixed to the surface of the rotating ring. The Z-shaped plate is slidably arranged at the bottom end of the L-shaped plate. The grinding block is located below the Z-shaped plate. The lifting assembly is located between the grinding block and the Z-shaped plate. The telescopic assembly is located between the Z-shaped plate and the L-shaped plate. The transmission assembly is located between the telescopic assembly and the rotating assembly. The extraction mechanism includes an exhaust fan blade, a storage assembly and multiple suction nozzles. The storage assembly is installed on one side of the L-shaped plate, the exhaust fan blade is installed on the top of the storage assembly, and multiple suction nozzles are equidistantly arranged on both sides of the grinding block, and each suction nozzle is connected to the storage assembly.

[0006] As a further solution of the present invention: the rotating assembly includes a fixed plate, a fixed ring, a driving wheel, a driven wheel, a transmission belt and a motor, the fixed plate is fixed to the top of the base plate, the fixed ring is fixed to the top of the fixed plate, the rotating ring is rotatably arranged on the outside of the fixed ring through a bearing, the driven wheel is fixedly installed on the outer wall of the rotating ring, the driving wheel is located below the driven wheel and is rotatably arranged on one side of the fixed plate, the transmission belt is sleeved on the outer walls of the driving wheel and the driven wheel, the motor is installed on the side of the fixed plate away from the driving wheel, and the output end of the motor is fixedly connected to the driving wheel.

[0007] As a further solution of the present invention: the moving assembly includes a mounting plate, a guide plate, a moving block, a top plate and a first cylinder, the mounting plate is fixed to one side of the rotating ring, the guide plate is installed on one side of the mounting plate, the moving block is slidably set on the guide plate, the top plate is fixed to the top of the guide plate, the first cylinder is installed at the top of the top plate, the output end of the first cylinder passes through the top plate and is fixedly connected to the moving block, and the welding gun is fixed to the side of the moving block away from the guide plate.

[0008] As a further solution of the present invention: the transmission assembly includes a spur gear, a first bevel gear, a second bevel gear, a rotating shaft and a ring gear, the ring gear is fixed to the inner wall of the fixed ring, the spur gear is located on one side of the ring gear and meshes with the ring gear, the spur gear is rotatably arranged on one side of the L-shaped plate, the first bevel gear is located on the side of the L-shaped plate away from the spur gear and is coaxially fixedly connected to the spur gear, the rotating shaft is rotatably arranged on the L-shaped plate, the second bevel gear is fixed to the surface of the rotating shaft, and the second bevel gear and the first bevel gear are meshed with each other.

[0009] As a further solution of the present invention: the telescopic assembly includes a disc, an insertion rod, a strip groove, two guide rails and two sliding bars. The disc is located below the L-shaped plate and fixed to the bottom end of the rotating shaft. The strip groove is opened at the top of the Z-shaped plate. One end of the insertion rod is fixed to the surface of the disc, and the other end of the insertion rod is inserted into the inside of the strip groove. The two sliding bars are symmetrically fixed to the top of the Z-shaped plate, and the two guide rails are symmetrically fixed to the bottom end of the L-shaped plate. Each sliding bar is slidably set inside a guide rail.

[0010] As a further solution of the present invention: the lifting assembly includes a second cylinder and multiple guide rods, the second cylinder is installed on the Z-shaped plate, the output end of the second cylinder passes through the Z-shaped plate and is connected to the grinding block, and the multiple guide rods are equidistantly slidably arranged on the Z-shaped plate, and the bottom end of each guide rod is fixedly connected to the grinding block.

[0011] As a further solution of the present invention: the storage assembly includes a collection box, two delivery pipes and multiple hoses, the collection box is installed on one side of the L-shaped plate, the two delivery pipes are symmetrically fixed on both sides of the L-shaped plate, multiple side panels are fixed on the surface of the grinding block, each suction nozzle is installed on a side panel, one end of each hose is connected to a suction nozzle, the other end of each hose is connected to a delivery pipe, the other end of each delivery pipe is connected to the collection box, and a filter is installed inside the collection box.

[0012] As a further solution of the present invention: the exhaust fan blades are installed at the top of the collection box, the top of the rotating shaft passes through the collection box and the filter screen inside the collection box and is fixedly connected to the exhaust fan blades, and a bearing is provided between the collection box and the rotating shaft.

[0013] As a further solution of the present invention: a plurality of pipe clamps for fixing the delivery pipes are symmetrically provided on both sides of the L-shaped plate.

[0014] As a further solution of the present invention: two fixing frames are symmetrically fixed on both sides of the top of the base plate, and each electric clamp is installed on one fixing frame.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. A circular tube plasma arc welding device of the present invention is provided with a welding gun, a rotating ring, a rotating assembly and a moving assembly. The moving assembly can be used to adjust the height of the welding gun so that the welding gun can be close to the circular tube to be welded. At the same time, the rotating assembly can drive the welding gun to rotate around the outer wall of the circular tube to achieve plasma arc welding of the two ends of the circular tube.

[0016] 2. A circular tube plasma arc welding device of the present invention is provided with an L-shaped plate, a Z-shaped plate, a grinding block, a lifting assembly, a telescopic assembly and a transmission assembly. The lifting assembly can be used to adjust the position of the L-shaped plate so that the L-shaped plate can contact the surface of the circular tube to be welded. When the rotating assembly is working, it can drive the grinding block to rotate synchronously to achieve grinding of the welding area. At the same time, during rotation, the telescopic assembly can be driven to work under the action of the transmission assembly, thereby driving the grinding block to move back and forth slightly along the length direction of the circular tube. That is, the grinding block can move in a circular motion along the surface of the circular tube under the action of the rotating assembly, and can also slide back and forth slightly along the length direction of the circular tube while moving in a circular motion, which can increase the friction with the surface of the circular tube and effectively improve the grinding effect, thereby effectively improving the removal effect of the oxide layer in the welding area, effectively avoiding the influence of the arc stability and welding quality during welding due to the presence of the oxide layer, and is conducive to increasing welding strength and improving welding stability.

[0017] 3. A circular tube plasma arc welding device of the present invention realizes the reciprocating movement of the insertion rod through the transmission assembly set up, that is, the rotating ring drives the grinding block to rotate while realizing the linkage effect, with high synchronization, and no additional drive source is required. It can effectively reduce the number of drive sources used in the plasma arc welding device and reduce costs.

[0018] 4. A circular tube plasma arc welding device of the present invention, by providing an exhaust fan blade, a storage component and a plurality of suction nozzles, can drive the exhaust fan blade to rotate while the transmission component is working. At this time, the dust generated during grinding can enter the internal storage of the collection box through the suction nozzle, the hose and the conveying pipe, which can effectively prevent the dust generated by grinding from affecting the welding work of the welding gun, and the rotation of the exhaust fan blade and the rotation of the rotating ring form a linkage effect with high synchronization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a front view of the present invention.

[0021] Figure 3 It is a structural schematic diagram of the fixing frame and the electric clamping claw in the present invention.

[0022] Figure 4 It is a structural schematic diagram of the rotating ring in the present invention.

[0023] Figure 5 For the present invention Figure 4 Schematic diagram of the structure of part A.

[0024] Figure 6 It is a schematic diagram of the split structure of the fixed ring and the rotating ring in the present invention.

[0025] Figure 7 Schematic diagram of the structure of the mobile component in the present invention.

[0026] Figure 8 It is a structural schematic diagram of the L-shaped plate in the present invention.

[0027] Figure 9 For the present invention Figure 8 Schematic diagram of the enlarged structure of part B.

[0028] Figure 10 It is a structural schematic diagram of the Z-shaped plate in the present invention.

[0029] Among them: 11. Base plate; 12. Fixed frame; 13. Electric gripper; 14. Fixed plate; 15. Fixed ring; 16. Rotating ring; 17. Driving wheel; 18. Driven wheel; 19. Transmission belt; 20. Motor; 21. Welding gun; 22. Mounting plate; 23. Guide plate; 24. Moving block; 25. Top plate; 26. First cylinder; 27. L-shaped plate; 28. Ring gear; 29. Spur gear; 30. First bevel gear; 31. Second bevel gear; 32. Rotating shaft; 33. Disc; 34. Insert rod; 35. Z-shaped plate; 36. Guide rail; 37. Sliding bar; 38. Strip groove; 39. Grinding block; 40. Second cylinder; 41. Guide rod; 42. Suction nozzle; 43. Side plate; 44. Hose; 45. Delivery pipe; 46. Pipe clamp; 47. Collection box; 48. Exhaust fan blade. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] The present invention provides the following preferred embodiments: Example 1, as Figures 1-10 As shown, a circular tube plasma arc welding device includes a base plate 11, a positioning mechanism, a welding mechanism, a grinding mechanism and an extraction mechanism; The positioning mechanism includes two fixing frames 12 and two electric clamps 13. The positioning mechanism is used to fix the two round tubes to be welded so that the ends of the two round tubes are aligned, which facilitates subsequent welding work. The welding mechanism includes a welding gun 21, a rotating ring 16, a rotating assembly and a moving assembly. The rotating assembly is mounted on the top middle portion of the base plate 11, the rotating ring 16 is mounted on one side of the rotating assembly, and the moving assembly is fixed to the surface of the rotating ring 16. The welding gun 21 is mounted on the moving assembly. The moving assembly can be used to adjust the height of the welding gun 21 so that the welding gun 21 can be close to the round pipe to be welded. At the same time, the rotating assembly can drive the rotating ring 16 to rotate, thereby rotating the welding gun 21 so that the welding gun 21 rotates around the outer wall of the round pipe to achieve plasma arc welding of the two ends of the round pipe; Plasma welding forms a high-energy-density plasma arc by compressing the arc, and its temperature can reach over 30,000°C, which can quickly melt the welding point of the round tube and form a weld to achieve welding.

[0032] The grinding mechanism includes an L-shaped plate 27, a Z-shaped plate 35, a grinding block 39, a lifting assembly, a telescopic assembly and a transmission assembly. The L-shaped plate 27 is located on one side of the welding gun 21 and is fixed to the surface of the rotating ring 16. When the rotating ring 16 rotates, it can drive the L-shaped plate 27 to rotate synchronously. The Z-shaped plate 35 is slidably arranged at the bottom end of the L-shaped plate 27. The grinding block 39 is located below the Z-shaped plate 35. The lifting assembly is located between the grinding block 39 and the Z-shaped plate 35. The telescopic assembly is located between the Z-shaped plate 35 and the L-shaped plate 27. The transmission assembly is located between the telescopic assembly and the rotating assembly. The position of the L-shaped plate 27 can be adjusted by using the lifting assembly so that the L-shaped plate 27 can contact the surface of the circular tube to be welded. When the rotating assembly is working, it can drive the grinding block 39 to rotate synchronously to achieve grinding of the welding area. At the same time, during the rotation, the telescopic assembly can be driven to work under the action of the transmission assembly, thereby driving the grinding block 39 to move back and forth slightly along the length direction of the circular tube, that is, the grinding block 39 can move in a circular manner along the surface of the circular tube under the action of the rotating assembly, and can also slide back and forth slightly along the length direction of the circular tube while moving in a circular manner, which can increase the friction with the surface of the circular tube and effectively improve the grinding effect, thereby effectively improving the removal effect of the oxide layer in the welding area, effectively avoiding the influence of the oxide layer on the arc stability and welding quality during the welding process, and is conducive to increasing the welding strength and improving the welding stability. The extraction mechanism includes an extraction fan blade 48, a storage assembly, and a plurality of suction nozzles 42. The storage assembly is mounted on one side of the L-shaped plate 27, the extraction fan blade 48 is mounted on the top of the storage assembly, and the plurality of suction nozzles 42 are equidistantly arranged on both sides of the grinding block 39, and each suction nozzle 42 is connected to the storage assembly. While the transmission assembly is working, it can drive the exhaust fan blades 48 to rotate. At this time, the dust generated during grinding can enter the internal storage of the storage assembly through the suction nozzle 42, which can effectively prevent the dust generated by grinding from affecting the welding work of the welding gun 21. The rotation of the exhaust fan blades 48 and the rotation of the rotating ring 16 form a linkage effect with high synchronization.

[0033] like Figures 1-10 As shown, the rotating assembly includes a fixed plate 14, a fixed ring 15, a driving wheel 17, a driven wheel 18, a transmission belt 19 and a motor 20. The fixed plate 14 is fixed to the top of the base plate 11, and the fixed ring 15 is fixed to the top of the fixed plate 14. Specifically, the fixed ring 15 is mounted on the top of the fixed plate 14 by bolts, and the rotating ring 16 is rotatably arranged on the outside of the fixed ring 15 through a bearing, that is, the rotating ring 16 can rotate on the outer wall of the fixed ring 15, and the driven wheel 18 is fixedly mounted on the outer wall of the rotating ring 16. The driving wheel 17 is located below the driven wheel 18 and is rotatably arranged on one side of the fixed plate 14. The transmission belt 19 is sleeved on the outer walls of the driving wheel 17 and the driven wheel 18. The motor 20 is mounted on the side of the fixed plate 14 away from the driving wheel 17, and the output end of the motor 20 is fixedly connected to the driving wheel 17. When the rotating ring 16 needs to be rotated, the controller controls the motor 20 to work, and the motor 20 can drive the driving wheel 17 to rotate, and under the action of the transmission belt 19, it can drive the driven wheel 18 to rotate. Since the driven wheel 18 and the rotating ring 16 are fixedly connected, when the driven wheel 18 rotates, it can drive the rotating ring 16 to rotate on the fixed ring 15.

[0034] like Figures 1-10 As shown, the moving assembly includes a mounting plate 22, a guide plate 23, a moving block 24, a top plate 25 and a first cylinder 26. The mounting plate 22 is fixed to one side of the rotating ring 16, the guide plate 23 is mounted on one side of the mounting plate 22, the moving block 24 is slidably set on the guide plate 23, the top plate 25 is fixed to the top of the guide plate 23, the first cylinder 26 is mounted on the top of the top plate 25, the output end of the first cylinder 26 passes through the top plate 25 and is fixedly connected to the moving block 24, and the welding gun 21 is fixed to the side of the moving block 24 away from the guide plate 23; It should be noted that the axis of the rotating ring 16 coincides with the axis of the electric clamp 13, so that the axis of the round tube clamped by the electric clamp 13 coincides with the axis of the rotating ring 16; When it is necessary to move the position between the welding gun 21 and the round tube, the controller controls the first cylinder 26 to work, and the first cylinder 26 can drive the moving block 24 to slide on the guide plate 23, thereby driving the welding gun 21 to move, so that the welding gun 21 can move toward the direction close to the round tube, which is convenient for welding the connection between the two round tubes and can be applied to the welding processing of round tubes of different diameters.

[0035] like Figures 1-10 As shown, the transmission assembly includes a spur gear 29, a first bevel gear 30, a second bevel gear 31, a rotating shaft 32 and a ring gear 28. The ring gear 28 is fixed to the inner wall of the fixing ring 15. The spur gear 29 is located on one side of the ring gear 28 and meshes with the ring gear 28. The spur gear 29 is rotatably arranged on one side of the L-shaped plate 27. The first bevel gear 30 is located on the side of the L-shaped plate 27 away from the spur gear 29 and is coaxially fixedly connected to the spur gear 29, that is, when the spur gear 29 rotates, it can drive the first bevel gear 30 to rotate synchronously. The rotating shaft 32 is rotatably arranged on the L-shaped plate 27. The second bevel gear 31 is fixed to the surface of the rotating shaft 32. The second bevel gear 31 and the first bevel gear 30 mesh with each other. When the rotating ring 16 rotates, it can drive the L-shaped plate 27 to rotate synchronously. When the L-shaped plate 27 rotates, it can drive the spur gear 29 to rotate. Since the spur gear 29 and the ring gear 28 are engaged with each other, and the ring gear 28 is fixed to the inner wall of the fixed ring 15, when the L-shaped plate 27 rotates with the first cylinder 26, under the action of the ring gear 28, the spur gear 29 can rotate around the axis of the spur gear 29, thereby driving the first bevel gear 30 to rotate. Since the first bevel gear 30 and the second bevel gear 31 are engaged with each other, when the first bevel gear 30 rotates, it can drive the second bevel gear 31 and the rotating shaft 32 to rotate along the axis of the rotating shaft 32.

[0036] like Figures 1-10 As shown, the telescopic assembly includes a disc 33, an insertion rod 34, a strip groove 38, two guide rails 36 and two sliding bars 37. The disc 33 is located below the L-shaped plate 27 and is fixed to the bottom end of the rotating shaft 32. The disc 33 is located between the L-shaped plate 27 and the Z-shaped plate 35. The strip groove 38 is opened at the top of the Z-shaped plate 35. One end of the insertion rod 34 is fixed to the surface of the disc 33, and the other end of the insertion rod 34 is inserted into the inside of the strip groove 38. The two sliding bars 37 are symmetrically fixed to the top of the Z-shaped plate 35, and the two guide rails 36 are symmetrically fixed to the bottom end of the L-shaped plate 27. Each sliding bar 37 is slidably set inside a guide rail 36. The sliding bar 37 slides inside the guide rail 36 to support and guide the Z-shaped plate 35. When the rotating shaft 32 rotates under the action of the second bevel gear 31, it can drive the disc 33 to rotate synchronously, and the disc 33 can drive the insertion rod 34 to rotate. Since the insertion rod 34 is inserted into the inside of the strip groove 38, when the disc 33 rotates, the Z-shaped plate 35 can be driven to move back and forth slightly under the L-shaped plate 27 under the action of the insertion rod 34 and the strip groove 38, thereby driving the grinding block 39 to move back and forth slightly on the surface of the circular tube, that is, the grinding block 39 can move in a circular motion along the surface of the circular tube under the action of the rotating assembly, and can also slide back and forth slightly along the length direction of the circular tube while moving in a circular motion, which can increase the friction with the surface of the circular tube and effectively improve the grinding effect, thereby effectively improving the removal effect of the oxide layer in the welding area, effectively avoiding the influence of the presence of the oxide layer on the arc stability and welding quality during welding, which is beneficial to increase welding strength and improve welding stability.

[0037] like Figures 1-10 As shown, the lifting assembly includes a second cylinder 40 and a plurality of guide rods 41. The second cylinder 40 is mounted on the Z-shaped plate 35. The output end of the second cylinder 40 passes through the Z-shaped plate 35 and is connected to the grinding block 39. The plurality of guide rods 41 are equidistantly slidably arranged on the Z-shaped plate 35. The bottom end of each guide rod 41 is fixedly connected to the grinding block 39. When the position of the grinding block 39 needs to be adjusted, the controller controls the second cylinder 40 to work, and the second cylinder 40 can drive the grinding block 39 to move under the Z-shaped plate 35, so that the grinding block 39 can move toward the direction close to the circular tube and contact the circular tube, which is convenient for the subsequent grinding of the circular edge surface to remove the oxide layer. During this process, the guide rod 41 can slide on the Z-shaped plate 35 under the action of the grinding block 39, providing guidance for the movement of the grinding block 39.

[0038] like Figures 1-10 As shown, the storage assembly includes a collection box 47, two delivery pipes 45 and multiple hoses 44. The collection box 47 is installed on one side of the L-shaped plate 27. The two delivery pipes 45 are symmetrically fixed on both sides of the L-shaped plate 27. Multiple side panels 43 are fixed to the surface of the grinding block 39. Each suction nozzle 42 is installed on a side panel 43. The side panels 43 are used to install the suction nozzle 42 and can support the suction nozzle 42. One end of each hose 44 is connected to a suction nozzle 42, and the other end of each hose 44 is connected to a delivery pipe 45. The other end of each delivery pipe 45 is connected to the collection box 47. A filter is installed inside the collection box 47. Specifically, the filter is used to filter metal dust in the air; When the exhaust fan blades 48 are working, the gas around the grinding block 39 can enter the interior of the suction nozzle 42. At the same time, the metal debris liquid generated by grinding enters the suction nozzle 42 along with the gas. Under the action of the hose 44 and the conveying pipe 45, the gas mixed with powder can enter the interior of the collection box 47. At this time, due to the action of the filter net, the dust in the air can be filtered, so that the dust can be stored in the interior of the collection box 47, which can effectively prevent the dust generated by grinding from affecting the welding work of the welding gun 21.

[0039] like Figures 1-10 As shown, the exhaust fan blades 48 are installed at the top of the collection box 47, and the top of the rotating shaft 32 passes through the collection box 47 and the filter screen inside the collection box 47 and is fixedly connected to the exhaust fan blades 48. When the rotating shaft 32 rotates, it can drive the exhaust fan blades 48 to rotate synchronously, so that the exhaust fan blades 48 can work with high synchronization. A bearing is provided between the collection box 47 and the rotating shaft 32, and the rotating shaft 32 is rotatably set on the collection box 47. Specifically, a mounting hole for the rotating shaft 32 to pass through is opened in the middle of the filter screen, and the rotating shaft 32 is rotatably set inside the first cylinder 26 through a bearing.

[0040] like Figures 1-10 As shown, a plurality of pipe clamps 46 for fixing the delivery pipe 45 are symmetrically provided on both sides of the L-shaped plate 27 . The arrangement of the pipe clamps 46 can support and limit the delivery pipe 45 , thereby ensuring the stability of the delivery pipe 45 .

[0041] like Figures 1-10As shown, two fixing frames 12 are symmetrically fixed on both sides of the top of the base plate 11 , and each electric clamp 13 is mounted on one fixing frame 12 .

[0042] Specifically, the electric clamp 13 is a three-jaw chuck, which can effectively position and fix the round tube, ensure the stability of the round tube, and facilitate subsequent welding work.

[0043] The specific working process of the present invention is as follows: First, place the two round tubes to be welded together on the two electric clamps 13 respectively, and use the two electric clamps 13 to clamp and position the two round tubes respectively so that the ends of the two round tubes are aligned, which facilitates the subsequent welding work; Then the controller controls the first cylinder 26 to work, and the first cylinder 26 can drive the moving block 24 to slide on the guide plate 23, thereby driving the welding gun 21 to move, so that the welding gun 21 can move in the direction close to the round tube, which is convenient for welding the connection between the two round tubes. At the same time, the controller controls the second cylinder 40 to work, and the second cylinder 40 can drive the grinding block 39 to move under the Z-shaped plate 35, so that the grinding block 39 can move in the direction close to the round tube and contact the round tube, which is convenient for subsequent grinding and removing the oxide layer on the surface of the round edge. During this process, the guide rod 41 can slide on the Z-shaped plate 35 under the action of the grinding block 39, providing a guide for the movement of the grinding block 39; Then the controller controls the motor 20 to work, and the motor 20 can drive the driving wheel 17 to rotate, and under the action of the transmission belt 19, it can drive the driven wheel 18 to rotate. Since the driven wheel 18 and the rotating ring 16 are fixedly connected, when the driven wheel 18 rotates, it can drive the rotating ring 16 to rotate on the fixed ring 15, thereby rotating the welding gun 21, so that the welding gun 21 rotates around the outer wall of the round tube, realizing plasma arc welding of the two ends of the round tube; At the same time, when the rotating ring 16 rotates, it can drive the L-shaped plate 27 to rotate synchronously, and when the L-shaped plate 27 rotates, it can drive the spur gear 29 to rotate. Since the spur gear 29 and the ring gear 28 are meshed with each other, and the ring gear 28 is fixed to the inner wall of the fixed ring 15, when the L-shaped plate 27 rotates with the first cylinder 26, under the action of the ring gear 28, the spur gear 29 can rotate around the axis of the spur gear 29, thereby driving the first bevel gear 30 to rotate. Since the first bevel gear 30 and the second bevel gear 31 are meshed with each other, when the first bevel gear 30 rotates, it can drive the second bevel gear 31 and the rotating shaft 32 to rotate along the axis of the rotating shaft 32. When the rotating shaft 32 rotates under the action of the second bevel gear 31, it can drive the disc 33 to rotate synchronously, and the disc 33 can drive the insertion rod 34 to rotate. , and because the insertion rod 34 is inserted into the inside of the strip groove 38, when the disc 33 rotates, the Z-shaped plate 35 can be driven to move back and forth slightly under the L-shaped plate 27 under the action of the insertion rod 34 and the strip groove 38, thereby driving the grinding block 39 to move back and forth slightly on the surface of the circular tube, that is, the grinding block 39 can move in a circular manner along the surface of the circular tube under the action of the rotating assembly, and can also slide back and forth slightly along the length direction of the circular tube while moving in a circular manner, which can increase the friction with the surface of the circular tube, effectively improve the grinding effect, thereby effectively improving the removal effect of the oxide layer in the welding area, effectively avoiding the influence of the oxide layer on the arc stability and welding quality during the welding process, which is beneficial to increase the welding strength and improve the welding stability; At the same time, when the rotating shaft 32 rotates, it can drive the exhaust fan blades 48 to rotate synchronously, so that the exhaust fan blades 48 work. When the exhaust fan blades 48 work, the gas around the grinding block 39 can enter the inside of the suction nozzle 42. At the same time, the metal debris liquid generated by grinding enters the suction nozzle 42 along with the gas. Under the action of the hose 44 and the conveying pipe 45, the gas mixed with powder can enter the inside of the collection box 47. At this time, due to the action of the filter, the dust in the air can be filtered, so that the dust can be stored in the collection box 47, which can effectively prevent the dust generated by grinding from affecting the welding work of the welding gun 21.

[0044] The beneficial effects of the present invention are specifically embodied in that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A circular tube plasma arc welding device, comprising a base plate (11), characterized in that: It also includes a positioning mechanism, a welding mechanism, a grinding mechanism and an extraction mechanism; The positioning mechanism includes two fixing frames (12) and two electric clamping claws (13); The welding mechanism comprises a welding gun (21), a rotating ring (16), a rotating assembly and a moving assembly, wherein the rotating assembly is mounted on the middle portion of the top end of the base plate (11), the rotating ring (16) is mounted on one side of the rotating assembly, the moving assembly is fixed to the surface of the rotating ring (16), and the welding gun (21) is mounted on the moving assembly; The grinding mechanism includes an L-shaped plate (27), a Z-shaped plate (35), a grinding block (39), a lifting assembly, a telescopic assembly and a transmission assembly, wherein the L-shaped plate (27) is located on one side of the welding gun (21) and is fixed to the surface of the rotating ring (16), the Z-shaped plate (35) is slidably arranged at the bottom end of the L-shaped plate (27), the grinding block (39) is located below the Z-shaped plate (35), the lifting assembly is located between the grinding block (39) and the Z-shaped plate (35), the telescopic assembly is located between the Z-shaped plate (35) and the L-shaped plate (27), and the transmission assembly is located between the telescopic assembly and the rotating assembly; The extraction mechanism includes an extraction fan blade (48), a storage assembly, and a plurality of suction nozzles (42), wherein the storage assembly is mounted on one side of the L-shaped plate (27), the extraction fan blade (48) is mounted on the top of the storage assembly, and the plurality of suction nozzles (42) are equidistantly arranged on both sides of the grinding block (39), and each suction nozzle (42) is connected to the storage assembly.

2. A circular tube plasma arc welding device according to claim 1, characterized in that: The rotating assembly comprises a fixed plate (14), a fixed ring (15), a driving wheel (17), a driven wheel (18), a transmission belt (19) and a motor (20), wherein the fixed plate (14) is fixed to the top of the bottom plate (11), the fixed ring (15) is fixed to the top of the fixed plate (14), the rotating ring (16) is rotatably arranged on the outside of the fixed ring (15) through a bearing, the driven wheel (18) is fixedly mounted on the outer wall of the rotating ring (16), the driving wheel (17) is located below the driven wheel (18) and is rotatably arranged on one side of the fixed plate (14), the transmission belt (19) is sleeved on the outer walls of the driving wheel (17) and the driven wheel (18), the motor (20) is mounted on a side of the fixed plate (14) away from the driving wheel (17), and the output end of the motor (20) is fixedly connected to the driving wheel (17).

3. A circular tube plasma arc welding device according to claim 2, characterized in that: The moving assembly comprises a mounting plate (22), a guide plate (23), a moving block (24), a top plate (25) and a first cylinder (26), wherein the mounting plate (22) is fixed to one side of the rotating ring (16), the guide plate (23) is mounted on one side of the mounting plate (22), the moving block (24) is slidably arranged on the guide plate (23), the top plate (25) is fixed to the top end of the guide plate (23), the first cylinder (26) is mounted on the top end of the top plate (25), the output end of the first cylinder (26) passes through the top plate (25) and is fixedly connected to the moving block (24), and the welding gun (21) is fixed to the side of the moving block (24) away from the guide plate (23).

4. A circular tube plasma arc welding device according to claim 3, characterized in that: The transmission assembly includes a spur gear (29), a first bevel gear (30), a second bevel gear (31), a rotating shaft (32) and a ring gear (28), wherein the ring gear (28) is fixed to the inner wall of the fixed ring (15), the spur gear (29) is located on one side of the ring gear (28) and meshes with the ring gear (28), the spur gear (29) is rotatably arranged on one side of the L-shaped plate (27), the first bevel gear (30) is located on a side of the L-shaped plate (27) away from the spur gear (29) and is coaxially fixedly connected to the spur gear (29), the rotating shaft (32) is rotatably arranged on the L-shaped plate (27), the second bevel gear (31) is fixed to the surface of the rotating shaft (32), and the second bevel gear (31) and the first bevel gear (30) are meshed with each other.

5. The circular tube plasma arc welding device according to claim 4, characterized in that: The telescopic assembly includes a disc (33), an insertion rod (34), a strip groove (38), two guide rails (36) and two sliding bars (37). The disc (33) is located below the L-shaped plate (27) and is fixed to the bottom end of the rotating shaft (32). The strip groove (38) is opened at the top end of the Z-shaped plate (35). One end of the insertion rod (34) is fixed to the surface of the disc (33), and the other end of the insertion rod (34) is inserted into the inside of the strip groove (38). The two sliding bars (37) are symmetrically fixed to the top end of the Z-shaped plate (35). The two guide rails (36) are symmetrically fixed to the bottom end of the L-shaped plate (27). Each sliding bar (37) is slidably arranged inside a guide rail (36).

6. The circular tube plasma arc welding device according to claim 5, characterized in that: The lifting assembly includes a second cylinder (40) and a plurality of guide rods (41), wherein the second cylinder (40) is mounted on the Z-shaped plate (35), an output end of the second cylinder (40) passes through the Z-shaped plate (35) and is connected to the grinding block (39), and the plurality of guide rods (41) are equidistantly slidably arranged on the Z-shaped plate (35), and the bottom end of each guide rod (41) is fixedly connected to the grinding block (39).

7. The circular tube plasma arc welding device according to claim 6, characterized in that: The storage assembly includes a collection box (47), two delivery pipes (45) and a plurality of hoses (44), the collection box (47) is installed on one side of the L-shaped plate (27), the two delivery pipes (45) are symmetrically fixed on both sides of the L-shaped plate (27), a plurality of side plates (43) are fixed on the surface of the grinding block (39), each suction nozzle (42) is installed on a side plate (43), one end of each hose (44) is connected to a suction nozzle (42), the other end of each hose (44) is connected to a delivery pipe (45), the other end of each delivery pipe (45) is connected to the collection box (47), and a filter is installed inside the collection box (47).

8. The circular tube plasma arc welding device according to claim 7, characterized in that: The exhaust fan blade (48) is installed at the top of the collection box (47), the top of the rotating shaft (32) passes through the collection box (47) and the internal filter screen of the collection box (47) and is fixedly connected to the exhaust fan blade (48), and a bearing is provided between the collection box (47) and the rotating shaft (32).

9. The circular tube plasma arc welding device according to claim 8, characterized in that: A plurality of pipe clamps (46) for fixing the delivery pipe (45) are symmetrically provided on both sides of the L-shaped plate (27).

10. The circular tube plasma arc welding device according to claim 9, characterized in that: Two fixing frames (12) are symmetrically fixed on both sides of the top of the base plate (11), and each electric clamp (13) is installed on one fixing frame (12).

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