Plasma arc welding device for stainless steel square tube

Abstract

The invention relates to the technical field of pipeline welding, in particular to a stainless steel square pipe plasma arc welding device which comprises a base and further comprises a supporting mechanism, a welding mechanism and a clamping mechanism. The stainless steel square tube plasma arc welding device comprises a base, a welding mechanism and a clamping mechanism, the welding mechanism comprises a double-shaft air cylinder, a welding gun and an angle adjusting assembly, a base table is fixedly arranged at the top of the base, and the clamping mechanism is arranged at the top of the base table and comprises a sliding assembly, a lifting assembly, a rotating assembly, a centering assembly and two clamping plates. And by supporting the interiors of the two square pipes and clamping and limiting the exteriors of the two square pipes, the problem of welding deformation under the action of contraction force and thermal stress of a welding seam can be prevented, and then the plasma arc welding quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline welding, and particularly relates to a plasma arc welding device for stainless steel square pipes. Background Art

[0002] Pipe fittings are a general term for components in a pipeline system that play roles such as connection, control, direction change, flow diversion, sealing, and support. A stainless steel square pipe is a pipe made of stainless steel material. It is a hollow long steel bar with a square cross-section. Due to its structural characteristics of both light weight and high strength, it is widely used in industrial, construction, and household fields.

[0003] The existing stainless steel square pipe welding devices have the following deficiencies: 1. The existing devices generally only design a single-layer support structure, and the support effect on the two square pipes to be welded is poor. Under the action of the shrinkage force and thermal stress of the weld, the square pipes lack stable support and are prone to deformation during welding, thus reducing the quality of the finished product.

[0004] 2. The existing devices cannot flexibly adjust the clamping angles of the support structure and the fixture according to the placement angles of the two square pipes, so they cannot meet different welding requirements and reduce the practicality of the devices. Summary of the Invention

[0005] The purpose of the present invention is to provide a plasma arc welding device for stainless steel square pipes.

[0006] To achieve this purpose, the present invention adopts the following technical solutions: Provide a plasma arc welding device for stainless steel square pipes, including a base; It further includes a support mechanism, a welding mechanism, and a clamping mechanism; The support mechanism is arranged on the top of the base. The support mechanism includes a first plug post, a second plug post, a first turntable, a telescopic assembly, and a driving assembly. The telescopic assembly is arranged on the top of the base through a first vertical plate. The driving assembly is arranged on the top of the base. The first plug post is fixedly arranged on the telescopic assembly. The first turntable is fixedly arranged on the driving assembly. The second plug post is rotatably arranged on the top of the first turntable; The welding mechanism is arranged on the top of the base. The welding mechanism includes a double-axis cylinder, a welding torch, and an angle adjustment assembly. A second vertical plate is fixedly arranged on the top of the base. The double-axis cylinder is fixedly arranged on the top of the second vertical plate, and a push plate is fixedly arranged on its output end. The angle adjustment assembly is arranged on the push plate, and the welding torch is arranged on the angle adjustment assembly; A base platform is fixedly arranged on the top of the base. The clamping mechanism is arranged on the top of the base platform. The clamping mechanism includes a sliding assembly, a lifting assembly, a rotating assembly, a centering assembly, and two clamping plates.

[0007] Furthermore, the telescopic component includes a single-axis cylinder, a telescopic spring, a push rod, and a first mounting plate. The single-axis cylinder is inserted into the top of the first vertical plate, the push rod is fixedly arranged at its output end, the output end of the single-axis cylinder is fixedly connected to one end of the push rod, the first mounting plate is fixedly arranged at the end of the push rod away from the single-axis cylinder, the telescopic spring is sleeved on the outer wall of the push rod, the first vertical plate and the first mounting plate respectively abut against both ends of the telescopic spring, and one end of the first insertion post is fixedly connected to the end of the first mounting plate away from the push rod.

[0008] Furthermore, the driving component includes a stepping motor, a driving wheel, a driven wheel, a belt, and a first rotating shaft. The stepping motor is fixedly arranged on the top of the base, the driving wheel is fixedly arranged at its output end, the first rotating shaft is rotatably arranged on the top of the base, the driven wheel is fixedly arranged on the first rotating shaft, the belt is sleeved between the driving wheel and the driven wheel, and the bottom of the first turntable is fixedly connected to the top end of the first rotating shaft.

[0009] Furthermore, two support blocks are fixedly arranged on the top of the first turntable. An articulated shaft is hinged between the two support blocks. A first micro-motor is inserted into the outer wall of one of the support blocks, and its output end is fixedly connected to one end of the articulated shaft. An articulated block is fixedly arranged on the outer wall of the articulated shaft, and the top of the articulated block is fixedly connected to the bottom of the second insertion post through a second mounting plate.

[0010] Furthermore, the angle adjustment component includes a first electric push rod, a swing rod, an insertion rod, and a U-shaped frame. A cross plate is fixedly arranged on the outer wall of the push plate, the U-shaped frame is fixedly arranged on the top of the cross plate, the first electric push rod is hinged on the outer wall of the U-shaped frame, the welding torch is rotatably arranged on the top of the U-shaped frame through a rotating rod, the swing rod is fixedly arranged at one end of the rotating rod, the insertion rod is arranged at the output end of the first electric push rod, and an avoidance groove for the insertion rod to slide is arranged on the outer wall of the end of the swing rod away from the rotating rod.

[0011] Furthermore, the sliding component includes a second electric push rod, a push block, an electric slide table, and two sliders. Two guide rails are fixedly arranged on the top of the base platform. Each slider is slidably arranged on the top of one guide rail. The electric slide table is fixedly arranged between the tops of the two sliders. The push block is fixedly arranged at the bottom of the electric slide table. The second electric push rod is fixedly arranged on the top of the base platform, and its output end is fixedly connected to one end of the push block.

[0012] Furthermore, the lifting component includes a first gear, a second gear, a second micro-motor, a lead screw, and a lifting plate. A sliding plate is slidably arranged on the top of the electric slide table. Four guide rods are fixedly arranged on the top of the sliding plate. The lifting plate is slidably arranged between the four guide rods through four sliding columns. An L-shaped plate is fixedly arranged on the side wall of the sliding plate. The lead screw is rotatably arranged between the L-shaped plate and the sliding plate. The second gear is fixedly arranged on the bottom outer wall of the lead screw. The second motor is fixedly arranged on the top of the sliding plate, and the first gear is fixedly arranged at its output end. The first gear and the second gear are meshed and connected. The lead screw is threadedly connected to the bottom of the lifting plate.

[0013] Further, the rotating assembly includes a third gear, a fourth gear, a DC motor, and a second rotating shaft. The DC motor is fixedly arranged on the outer wall of the lifting plate, the third gear is fixedly arranged on its output end, the second rotating shaft is rotatably arranged on the top of the lifting plate, the fourth gear is fixedly arranged on the second rotating shaft, and the third gear and the fourth gear are meshed and connected.

[0014] Further, the centering assembly includes a support frame, a servo motor, a second turntable, two connecting rods, two sliding bars, and two sliding rails. The support frame is fixedly arranged at one end of the second rotating shaft away from the fourth gear, the servo motor is inserted into the support frame, the second turntable is fixedly arranged on its output end, the two sliding rails are symmetrically arranged on the support frame, each sliding bar is slidably arranged on one sliding rail, each connecting rod is hinged between one end of the turntable and one sliding bar, and each clamping plate is fixedly arranged on the outer wall of one sliding bar.

[0015] Further, a plurality of anti-slip pads are fixedly arranged on the outer wall of each clamping plate.

[0016] Advantages of the present invention: 1. By designing the support mechanism, namely the first plug post, the second plug post, the first turntable, the telescopic assembly, and the driving assembly, the inclination angle of the second plug post can be flexibly adjusted through the turntable and the driving assembly, and in cooperation with the first plug post, it can be inserted into the interiors of two square tubes with different placement angles, achieving a positioning effect on the two square tubes.

[0017] 2. By designing the clamping mechanism, namely the sliding assembly, the lifting assembly, the rotating assembly, the centering assembly, and two clamping plates, through the cooperation of the above structures, the two ends of the square tubes with different placement angles can be clamped and limited, preventing the square tubes from shifting during the welding process, which is beneficial to improving the plasma arc welding effect.

[0018] 3. Combining the two advantages in items 1 and 2, by internally supporting the two square tubes and externally clamping and limiting the two square tubes, the problem of welding deformation caused by the shrinkage force and thermal stress of the weld can be prevented, thereby improving the plasma arc welding quality.

[0019] 4. By designing the sliding assembly, the lifting assembly, the rotating assembly, and the centering assembly, the angles of the two clamping plates can be flexibly adjusted, thereby adjusting the clamping angle of the square tubes, meeting the welding requirements for different connection shapes of the two square tubes, meeting different usage requirements, further improving the flexibility of the present device, and enhancing the market competitiveness.

[0020] 5. By designing the angle adjustment assembly, the welding angle of the welding torch can be flexibly adjusted, facilitating the welding of all joints of the two square tubes with different connection shapes, improving the welding efficiency, and at the same time enhancing the practicality of the present welding device.

[0021] 6. By designing the telescopic component, the present invention can not only conveniently adjust the position of the first insertion rod, facilitating the feeding of square tubes, that is, facilitating the sleeving of square tubes onto the outer wall of the first insertion rod, but also, after each welding of two square tubes, the first insertion rod can be driven by a single-axis cylinder to be withdrawn from one of the horizontally placed square tubes. Thus, it is convenient for the horizontally placed steel pipe to drive the square tube welded to its bottom to be withdrawn from the outer wall of the second insertion rod at one time, realizing the separation from the device, and thereby improving the feeding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings in the embodiments of the present invention.

[0023] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is Figure 1 an enlarged view of part A in Figure 3 is Figure 1 an enlarged view of part B in Figure 4 is a sectional structural schematic diagram of two square tubes of the present invention; Figure 5 is Figure 4 an enlarged view of part C in Figure 6 is Figure 4 an enlarged view of part D in Figure 7 is a three-dimensional structural schematic of the welding mechanism and the clamping mechanism of the present invention Figure 1 ; Figure 8 is Figure 7 an enlarged view of part E in Figure 9 is a three-dimensional structural schematic of the welding mechanism and the clamping mechanism of the present invention Figure 2 ; Figure 10 is Figure 9 an enlarged view of part F in Figure 11 is a schematic diagram of the welded finished product of two square tubes of the present invention; In the figure: the first plug post 10, the second plug post 11, the first turntable 12, the double-shaft cylinder 13, the welding torch 14, the push plate 15, the clamping plate 16, the single-shaft cylinder 17, the telescopic spring 18, the pushing rod 19, the first mounting plate 20, the stepping motor 21, the driving wheel 22, the driven wheel 23, the belt 24, the first rotating shaft 25, the first micro-motor 26, the hinged block 27, the second mounting plate 28, the first electric push rod 29, the swing rod 30, the inserting rod 31, the U-shaped frame 32, the rotating rod 33, the avoiding groove 34, the second electric push rod 35, the pushing block 36, the electric slide table 37, the slider 38, the first gear 39, the second gear 40, the second micro-motor 41, the lead screw 42, the lifting plate 43, the sliding plate 44, the sliding column 45, the third gear 46, the fourth gear 47, the DC motor 48, the second rotating shaft 49, the support frame 50, the servo motor 51, the second turntable 52, the connecting rod 53, the sliding strip 54, the sliding rail 55, the anti-slip pad 56. Detailed implementation manners

[0024] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation manners.

[0025] Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and cannot be understood as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product.

[0026] Referring to Figures 1 to 11 as shown, a plasma arc welding device for stainless steel square tubes includes a base; It further includes a support mechanism, a welding mechanism and a clamping mechanism; The support mechanism is arranged on the top of the base. The support mechanism includes the first plug post 10, the second plug post 11, the first turntable 12, a telescopic component and a driving component. The telescopic component is arranged on the top of the base through a first vertical plate. The driving component is arranged on the top of the base. The first plug post 10 is fixedly arranged on the telescopic component. The first turntable 12 is fixedly arranged on the driving component. The second plug post 11 is rotatably arranged on the top of the first turntable 12; The welding mechanism is arranged on the top of the base. The welding mechanism includes the double-shaft cylinder 13, the welding torch 14 and an angle adjustment component. A second vertical plate is fixedly arranged on the top of the base. The double-shaft cylinder 13 is fixedly arranged on the top of the second vertical plate. A push plate 15 is fixedly arranged on its output end. The angle adjustment component is arranged on the push plate 15. The welding torch 14 is arranged on the angle adjustment component; A base platform is fixedly arranged on the top of the base. The clamping mechanism is arranged on the top of the base platform. The clamping mechanism includes a sliding component, a lifting component, a rotating component, a centering component and two clamping plates 16.

[0027] Referring to Figures 1 to 11As shown in the figure, the telescopic component includes a single-axis cylinder 17, a telescopic spring 18, a push rod 19 and a first mounting plate 20. The single-axis cylinder 17 is inserted into the top of the first vertical plate, and the push rod 19 is fixedly arranged on its output end. The output end of the single-axis cylinder 17 is fixedly connected to one end of the push rod 19. The first mounting plate 20 is fixedly arranged at the end of the push rod 19 away from the single-axis cylinder 17. The telescopic spring 18 is sleeved on the outer wall of the push rod 19. The first vertical plate and the first mounting plate 20 are respectively in contact with both ends of the telescopic spring 18. One end of the first insertion post 10 is fixedly connected to the end of the first mounting plate 20 away from the push rod 19. This device is equipped with a controller, and each electrical device in the device is electrically connected to the controller. There is a gap with the same wall thickness as the square pipe to be welded between the first insertion post 10 and the second insertion post 11. When welding two vertically placed square pipes, the single-axis cylinder 17 is started through the controller, so that its output end contracts, thus driving the push rod 19 to pull to the left. Since the output end of the single-axis cylinder 17 and the first mounting plate 20 are respectively fixedly connected to both ends of the push rod 19, and one end of the first insertion post 10 is fixedly connected to the end of the first mounting plate 20 away from the push rod 19, the first insertion post 10 is driven to pull to the left through the push rod 19 until the first insertion post 10 moves away from above the second insertion post 11. During this process, the telescopic spring 18 is extruded by the first mounting plate 20 and changes from the initial state to a taut state, playing a buffering role. Then, one of the square pipes is vertically sleeved on the outer wall of the second insertion post 11. Next, the output end of the single-axis cylinder 17 and the push rod 19 thereon are driven by the controller to return to the initial position, so as to drive the first insertion post 10 on the first mounting plate 20 at one end of the push rod 19 to return to the initial position. Then, the other square pipe is sleeved on the outer wall of the first insertion post 10. At this time, the first insertion post 10 and the second insertion post 11 make the two square pipes fit and place vertically.

[0028] Refer to Figures 1 to 11As shown, the driving component includes a stepper motor 21, a driving wheel 22, a driven wheel 23, a belt 24 and a first rotating shaft 25. The stepper motor 21 is fixedly arranged on the top of the base, the driving wheel 22 is fixedly arranged on its output end, the first rotating shaft 25 is rotatably arranged on the top of the base, the driven wheel 23 is fixedly arranged on the first rotating shaft 25, the belt 24 is sleeved between the driving wheel 22 and the driven wheel 23, the bottom of the first turntable 12 is fixedly connected to the top end of the first rotating shaft 25. When one of the seams of the two square tubes is welded, the push plate 15 is driven to contract by the double-axis cylinder 13, so that the welding torch 14 is driven to move away by the push plate 15, providing an avoidance space for the rotation of the two square tubes. After the welding torch 14 moves away, the stepper motor 21 is started by the controller, so that its output end drives the driving wheel 22 to rotate. Since the driven wheel 23 is rotatably connected to the base through the first rotating shaft 25, the driving wheel 22 and the driven wheel 23 are sleeved by the belt 24, and the first turntable 12 is fixedly connected to the first rotating shaft 25, and the second insertion post 11 is designed on the first turntable 12, thereby driving the two square tubes to rotate 90 degrees to facilitate the welding of the next seam of the two square tubes.

[0029] Refer to Figures 1 to 11 As shown, two support blocks are fixedly arranged on the top of the first turntable 12, a hinge shaft is hinged between the two support blocks, a first micro-motor 26 is inserted on the outer wall of one of the support blocks, and its output end is fixedly connected to one end of the hinge shaft. A hinge block 27 is fixedly arranged on the outer wall of the hinge shaft, and the top of the hinge block 27 is fixedly connected to the bottom of the second insertion post 11 through a second mounting plate 28. When welding a horizontally placed square tube and an obliquely placed square tube, the first micro-motor 26 is started by the controller, so that its output end drives the hinge shaft, that is, the hinge block 27 on the hinge shaft, to rotate. Since the hinge block 27 is fixedly connected to the second insertion post 11 through the second mounting plate 28, the second mounting plate 28 and the second insertion post 11 thereon are driven to rotate around the hinge shaft by the hinge block 27 until it stops at the required welding placement angle, and then one of the square tubes is sleeved on the outer wall of the second insertion post 11, and then the other horizontally placed square tube is sleeved on the outer wall of the first insertion post 10 and pressed against the obliquely placed square tube through the previous steps.

[0030] Refer to Figures 1 to 11As shown in the figure, the angle adjustment component includes a first electric push rod 29, a swing rod 30, a plug rod 31 and a U-shaped frame 32. A cross plate is fixedly arranged on the outer wall of the push plate 15, and the U-shaped frame 32 is fixedly arranged on the top of the cross plate. The first electric push rod 29 is hinged on the outer wall of the U-shaped frame 32. The welding torch 14 is rotatably arranged on the top of the U-shaped frame 32 through a rotating rod 33. The swing rod 30 is fixedly arranged at one end of the rotating rod 33. The plug rod 31 is arranged on the output end of the first electric push rod 29. An avoidance groove 34 for the plug rod 31 to slide is formed on the outer wall of the swing rod 30 away from the rotating rod 33. After the vertically placed square tube is clamped, the first electric push rod 29 is started by the controller, so that its output end extends or retracts. Since the first electric push rod 29 is rotatably connected to the U-shaped frame 32, the plug rod 31 is fixedly connected to its output end, and the plug rod 31 is inserted into the avoidance groove 34 on the swing rod 30, and the welding torch 14 is rotatably connected to the U-shaped rod through the rotating rod 33. Therefore, when the plug rod 31 moves in the avoidance groove 34, it drives the swing rod 30 and the welding torch 14 thereon to rotate until the welding torch 14 rotates to be flush with the butt joint position of the two square tubes. Then, the double-axis cylinder 13 is started by the controller, so that its output end drives the push plate 15 to move towards the end close to the square tube. When the push plate 15 drives the welding torch 14 to move close to the butt joint position of the two square tubes, the welding torch 14 is started to weld at this position. Preferably, in plasma arc welding, the gas is dissociated by the arc heating. When it passes through the water-cooled nozzle at high speed, it is compressed, increasing the energy density and dissociation degree, forming a plasma arc that sprays towards the butt joint position of the square tubes to weld the butt joint position of the two square tubes.

[0031] Refer to Figures 1 to 11 As shown in the figure, the sliding component includes a second electric push rod 35, a push block 36, an electric slide table 37 and two sliders 38. Two guide rails are fixedly arranged on the top of the base. Each slider 38 is slidably arranged on the top of a guide rail. The electric slide table 37 is fixedly arranged between the tops of the two sliders 38. The push block 36 is fixedly arranged at the bottom of the electric slide table 37. The second electric push rod 35 is fixedly arranged on the top of the base, and its output end is fixedly connected to one end of the push block 36. After another horizontally placed square tube is sleeved on the outer wall of the first insertion column 10 and abuts against the inclined square tube, the second electric push rod 35 is started by the controller to make its output end extend or retract. Since its output end is fixedly connected to the push block 36 and the push block 36 is fixedly connected to the electric slide table 37, its output end drives the electric slide table 37 and the slide plate 44 on its top to slide left and right until the two clamping plates 16 slide to the side of the inclined square tube.

[0032] Refer to Figures 1 to 11As shown in the figure, the lifting assembly includes a first gear 39, a second gear 40, a second micro-motor 41, a lead screw 42, and a lifting plate 43. A sliding plate 44 is slidably disposed on the top of the electric slide 37. Four guide rods are fixedly disposed on the top of the sliding plate 44. The lifting plate 43 is slidably disposed between the four guide rods through four sliding columns 45. An L-shaped plate is fixedly disposed on the side wall of the sliding plate 44. The lead screw 42 is rotatably disposed between the L-shaped plate and the sliding plate 44. The second gear 40 is fixedly disposed on the outer wall of the bottom of the lead screw 42. The second motor is fixedly disposed on the top of the sliding plate 44. The first gear 39 is fixedly disposed on its output end. The first gear 39 and the second gear 40 are meshed and connected. The lead screw 42 is threadedly connected to the bottom of the lifting plate 43. When the second rotating shaft 49 rotates, since the support frame 50 is fixedly connected to the end of the second rotating shaft 49 away from the fourth gear 47, the support frame 50 is driven to rotate. Since the centering assembly is designed on the support frame 50, the two clamping plates 16 are driven to rotate until the two clamping plates 16 are rotated to the same placement angle as the obliquely placed square tube, and then the DC motor 48 is powered off to stop the rotation of the second rotating shaft 49. Then, the second micro-motor 41 is started through the controller, so that the first gear 39 on its output end rotates. Since the second gear 40 is fixedly connected to the bottom of the lead screw 42, the lead screw 42 is rotatably designed between the L-shaped plate and the sliding plate 44, and the lead screw 42 is threadedly connected to the lifting plate 43, the lifting plate 43 and the two clamping plates 16 thereon are driven to lift until the two clamping plates 16 just tightly fit against the two ends of the obliquely placed square tube after being extended. Then, the two clamping plates 16 are brought closer to each other through the centering assembly to clamp and limit the two ends of the obliquely placed square tube. Then, the welding of all the joints of the two square tubes is carried out in sequence through the previous steps, and thus the welding work of a horizontally placed square tube and an obliquely placed square tube is completed.

[0033] Referring to Figures 1 to 11 As shown in the figure, the rotating assembly includes a third gear 46, a fourth gear 47, a DC motor 48, and a second rotating shaft 49. The DC motor 48 is fixedly disposed on the outer wall of the lifting plate 43. The third gear 46 is fixedly disposed on its output end. The second rotating shaft 49 is rotatably disposed on the top of the lifting plate 43. The fourth gear 47 is fixedly disposed on the second rotating shaft 49. The third gear 46 and the fourth gear 47 are meshed and connected. When the two clamping plates 16 slide to the side of the obliquely placed square tube, the DC motor 48 is started through the controller, so that the third gear 46 is driven to rotate by its output end. Since the fourth gear 47 is fixedly connected to the second rotating shaft 49, the third gear 46 and the fourth gear 47 are meshed and connected, and the second rotating shaft 49 is rotatably connected to the lifting plate 43, the second rotating shaft 49 is driven to rotate.

[0034] Referring to Figures 1 to 11As shown in the figure, the centering assembly includes a support frame 50, a servo motor 51, a second turntable 52, two connecting rods 53, two sliding bars 54 and two sliding rails 55. The support frame 50 is fixedly arranged at one end of the second rotating shaft 49 away from the fourth gear 47. The servo motor 51 is inserted on the support frame 50, and the second turntable 52 is fixedly arranged at its output end. The two sliding rails 55 are symmetrically arranged on the support frame 50. Each sliding bar 54 is slidably arranged on one sliding rail 55. Each connecting rod 53 is hinged between one end of the turntable and one sliding bar 54. Each clamping plate 16 is fixedly arranged on the outer wall of one sliding bar 54. When the two square tubes are placed vertically and in contact with each other, start the electric slide table 37, so as to drive the sliding plate 44 at its top to slide towards one end close to the square tube. When it slides to the position where the two clamping plates 16 are located on both sides of the vertically placed square tube, start the servo motor 51 through the controller, so that its output end drives the second turntable 52 to rotate. Since one end of the turntable and one sliding bar 54 are respectively hinged to both ends of one connecting rod 53, each sliding bar 54 is slidably connected to one sliding rail 55, and each clamping plate 16 is fixedly connected to one sliding bar 54, the two clamping plates 16 are driven to approach each other, so as to realize the clamping and limiting of the vertically placed square tube.

[0035] Referring to Figures 1 to 11 As shown in the figure, a plurality of anti-slip pads 56 are fixedly arranged on the outer wall of each clamping plate 16. The plurality of anti-slip pads 56 are made of rubber material, which can improve the friction between the two clamping plates 16 and the square tube, and is beneficial to improving the clamping effect.

[0036] The working principle of the present invention: The device is equipped with a controller, and each electrical device in the device is electrically connected to the controller. There is a gap consistent with the wall thickness of the square tube to be welded between the first plug post 10 and the second plug post 11. When welding two vertically placed square tubes, start the single-axis cylinder 17 through the controller, so that its output end contracts, thus driving the push rod 19 to pull to the left. Since the output end of the single-axis cylinder 17 and the first mounting plate 20 are respectively fixedly connected to both ends of the push rod 19, and one end of the first plug post 10 is fixedly connected to the end of the first mounting plate 20 away from the push rod 19, the first plug post 10 is driven to pull to the left through the push rod 19 until the first plug post 10 moves away from above the second plug post 11. During this process, the telescopic spring 18 is squeezed by the first mounting plate 20 and changes from the initial state to the tight state, playing a buffering role. Then, one of the square tubes is vertically sleeved on the outer wall of the second plug post 11. Then, drive the output end of the single-axis cylinder 17 and the push rod 19 thereon to return to the initial position through the controller, so as to drive the first plug post 10 on the first mounting plate 20 at one end of the push rod 19 to return to the initial position. Then, the other square tube is sleeved on the outer wall of the first plug post 10. At this time, the first plug post 10 and the second plug post 11 make the two square tubes vertically placed and in contact with each other.

[0037] After the two square tubes are placed vertically and fitted together, start the electric slide table 37, which drives the slide plate 44 on its top to slide towards one end close to the square tube. When it slides to the position where the two clamping plates 16 are on both sides of the vertically placed square tube, start the servo motor 51 through the controller, so that its output end drives the second turntable 52 to rotate. Since one end of the turntable and a slide bar 54 are respectively hinged to both ends of a connecting rod 53, each slide bar 54 is slidably connected to a slide rail 55, and each clamping plate 16 is fixedly connected to a slide bar 54, the two clamping plates 16 are driven to approach each other, thereby realizing the clamping and limiting of the vertically placed square tube. A number of anti-slip pads 56 are made of rubber material, which can increase the friction between the two clamping plates 16 and the square tube, and is beneficial to improving the clamping effect.

[0038] After the vertically placed square tube is clamped, start the first electric push rod 29 through the controller, so that its output end extends or retracts. Since the first electric push rod 29 is rotatably connected to the U-shaped frame 32, the insertion rod 31 is fixedly connected to its output end, and the insertion rod 31 is inserted into the avoidance groove 34 on the swing rod 30. The welding torch 14 is rotatably connected to the U-shaped rod through the rotating rod 33. Therefore, when the insertion rod 31 moves in the avoidance groove 34, it drives the swing rod 30 and the welding torch 14 thereon to rotate until the welding torch 14 rotates to be flush with the butt joint position of the two square tubes. Then start the double-axis cylinder 13 through the controller, so that its output end drives the push plate 15 to move towards one end close to the square tube. When the push plate 15 drives the welding torch 14 to move close to the butt joint position of the two square tubes, start the welding torch 14 to weld at this position. Preferably, in plasma arc welding, the gas is dissociated by arc heating, and when it passes through the water-cooled nozzle at high speed, it is compressed, increasing the energy density and degree of dissociation, forming a plasma arc that sprays towards the butt joint position of the square tube to weld the butt joint position of the two square tubes.

[0039] When one of the seams of the two square tubes is welded, drive the push plate 15 to contract through the double-axis cylinder 13, so that the welding torch 14 is driven to move away by the push plate 15, providing an avoidance space for the rotation of the two square tubes. After the welding torch 14 moves away, start the stepping motor 21 through the controller, so that its output end drives the driving wheel 22 to rotate. Since the driven wheel 23 is rotatably connected to the base through the first rotating shaft 25, the driving wheel 22 and the driven wheel 23 are sleeved with a belt 24, and the first turntable 12 is fixedly connected to the first rotating shaft 25, and the second insertion column 11 is designed on the first turntable 12, so that the two square tubes are driven to rotate 90 degrees to facilitate the welding of the next seam of the two square tubes. According to the above steps, all four seams of the two square tubes can be welded, and then the welding work of the two square tubes that need to be vertically fixedly connected is completed.

[0040] When it is necessary to weld a horizontally placed square pipe and an inclined square pipe, the first micro-motor 26 is started through the controller, so that the output end thereof drives the hinge shaft, that is, the hinge block 27 on the hinge shaft to rotate. Since the hinge block 27 is fixedly connected to the second insertion column 11 through the second mounting plate 28, the second mounting plate 28 and the second insertion column 11 thereon are driven by the hinge block 27 to rotate around the hinge shaft until it is rotated to the required welding placement angle and then stopped. Then one of the square pipes is sleeved on the outer wall of the second insertion column 11, and the other horizontally placed square pipe is sleeved on the outer wall of the first insertion column 10 and pressed against the inclined square pipe through the previous steps.

[0041] After the other horizontally placed square pipe is sleeved on the outer wall of the first insertion column 10 and pressed against the inclined square pipe, the second electric push rod 35 is started through the controller, and its output end extends or contracts. Since its output end is fixedly connected to the push block 36, and the push block 36 is fixedly connected to the electric sliding table 37, the electric sliding table 37 and the top slide plate 44 thereon are driven to slide left and right through its output end until the two clamping plates 16 slide to the side of the inclined square pipe.

[0042] When the two clamping plates 16 slide to the side of the inclined square pipe, the DC motor 48 is started through the controller, so that the output end thereof drives the third gear 46 to rotate. Since the fourth gear 47 is fixedly connected to the second rotating shaft 49, the third gear 46 and the fourth gear 47 are meshed and connected, and the second rotating shaft 49 is rotatably connected to the lifting plate 43, and then the second rotating shaft 49 is driven to rotate. Since the support frame 50 is fixedly connected to the end of the second rotating shaft 49 away from the fourth gear 47, the support frame 50 is driven to rotate. Since the centering assembly is designed on the support frame 50, the two clamping plates 16 are driven to rotate until the two clamping plates 16 are rotated to the same placement angle as the inclined square pipe, and then the DC motor 48 is powered off to stop the rotation of the second rotating shaft 49. Then the second micro-motor 41 is started through the controller, so that the first gear 39 on its output end rotates. Since the second gear 40 is fixedly connected to the bottom of the lead screw 42, the lead screw 42 is rotationally designed between the L-shaped plate and the slide plate 44, and the lead screw 42 is threadedly connected to the lifting plate 43, so that the lifting plate 43 and the two clamping plates 16 thereon are driven to lift until the two clamping plates 16 just tightly press against both ends of the inclined square pipe after being extended. Then the two clamping plates 16 are made to approach each other through the centering assembly to clamp and limit both ends of the inclined square pipe. Then the seams of the two square pipes are welded in sequence through the previous steps, thereby completing the welding work of a horizontally placed square pipe and an inclined square pipe.

Claims

1. A plasma arc welding device for a stainless steel square tube, comprising a base, characterized in that: it further comprises a support mechanism, a welding mechanism and a clamping mechanism; The support mechanism is arranged on the top of the base. The support mechanism includes a first insertion column (10), a second insertion column (11), a first turntable (12), a telescopic component and a driving component. The telescopic component is arranged on the top of the base through a first vertical plate. The driving component is arranged on the top of the base. The first insertion column (10) is fixedly arranged on the telescopic component. The first turntable (12) is fixedly arranged on the driving component. The second insertion column (11) is rotatably arranged on the top of the first turntable (12); The welding mechanism is arranged on the top of the base. The welding mechanism includes a double-axis cylinder (13), a welding torch (14) and an angle adjustment component. A second vertical plate is fixedly arranged on the top of the base. The double-axis cylinder (13) is fixedly arranged on the top of the second vertical plate. A push plate (15) is fixedly arranged on its output end. The angle adjustment component is arranged on the push plate (15). The welding torch (14) is arranged on the angle adjustment component; A base platform is fixedly arranged on the top of the base. The clamping mechanism is arranged on the top of the base platform. The clamping mechanism includes a sliding component, a lifting component, a rotating component, a centering component and two clamping plates (16).

2. The plasma arc welding device for stainless steel square tubes according to claim 1, wherein: The telescopic component includes a single-axis cylinder (17), a telescopic spring (18), a pushing rod (19) and a first mounting plate (20). The single-axis cylinder (17) is inserted into the top of the first vertical plate. The pushing rod (19) is fixedly arranged on its output end. The output end of the single-axis cylinder (17) is fixedly connected to one end of the pushing rod (19). The first mounting plate (20) is fixedly arranged at the end of the pushing rod (19) away from the single-axis cylinder (17). The telescopic spring (18) is sleeved on the outer wall of the pushing rod (19). The first vertical plate and the first mounting plate (20) are respectively in contact with both ends of the telescopic spring (18). One end of the first insertion column (10) is fixedly connected to the end of the first mounting plate (20) away from the pushing rod (19).

3. The plasma arc welding device for a stainless steel square tube according to claim 2, characterized in that: The driving component includes a stepping motor (21), a driving wheel (22), a driven wheel (23), a belt (24) and a first rotating shaft (25). The stepping motor (21) is fixedly arranged on the top of the base. The driving wheel (22) is fixedly arranged on its output end. The first rotating shaft (25) is rotatably arranged on the top of the base. The driven wheel (23) is fixedly arranged on the first rotating shaft (25). The belt (24) is sleeved between the driving wheel (22) and the driven wheel (23). The bottom of the first turntable (12) is fixedly connected to the top end of the first rotating shaft (25).

4. A plasma arc welding device for stainless steel square tubes according to claim 3, characterized in that: Two support blocks are fixedly arranged on the top of the first turntable (12). An articulated shaft is hinged between the two support blocks. A first micro-motor (26) is inserted into the outer wall of one of the support blocks. Its output end is fixedly connected to one end of the articulated shaft. An articulated block (27) is fixedly arranged on the outer wall of the articulated shaft. The top of the articulated block (27) is fixedly connected to the bottom of the second insertion column (11) through a second mounting plate (28).

5. The plasma arc welding device for a stainless steel square tube according to claim 4, characterized in that: The angle adjustment assembly includes a first electric push rod (29), a swing rod (30), a plug rod (31) and a U-shaped frame (32). A cross plate is fixedly arranged on the outer wall of the push plate (15). The U-shaped frame (32) is fixedly arranged on the top of the cross plate. The first electric push rod (29) is hinged on the outer wall of the U-shaped frame (32). The welding torch (14) is rotatably arranged on the top of the U-shaped frame (32) through a rotating rod (33). The swing rod (30) is fixedly arranged at one end of the rotating rod (33). The plug rod (31) is arranged on the output end of the first electric push rod (29). An avoidance groove (34) for the plug rod (31) to slide is formed on the outer wall of the swing rod (30) far away from the rotating rod (33).

6. The plasma arc welding device for stainless steel square tubes according to claim 5, characterized in that: The sliding assembly includes a second electric push rod (35), a push block (36), an electric slide table (37) and two sliders (38). Two guide rails are fixedly arranged on the top of the base. Each slider (38) is slidably arranged on the top of a guide rail. The electric slide table (37) is fixedly arranged between the tops of the two sliders (38). The push block (36) is fixedly arranged at the bottom of the electric slide table (37). The second electric push rod (35) is fixedly arranged on the top of the base, and its output end is fixedly connected with one end of the push block (36).

7. An apparatus for plasma arc welding of stainless steel square tubes according to claim 6, characterized in that: The lifting assembly includes a first gear (39), a second gear (40), a second micro motor (41), a lead screw (42) and a lifting plate (43). A sliding plate (44) is slidably arranged on the top of the electric slide table (37). Four guide rods are fixedly arranged on the top of the sliding plate (44). The lifting plate (43) is slidably arranged between the four guide rods through four sliding columns (45). An L-shaped plate is fixedly arranged on the side wall of the sliding plate (44). The lead screw (42) is rotatably arranged between the L-shaped plate and the sliding plate (44). The second gear (40) is fixedly arranged on the outer wall of the bottom of the lead screw (42). The second motor is fixedly arranged on the top of the sliding plate (44). The first gear (39) is fixedly arranged on its output end. The first gear (39) and the second gear (40) are meshed and connected. The lead screw (42) is threadedly connected with the bottom of the lifting plate (43).

8. A plasma arc welding device for stainless steel square tubes according to claim 7, characterized in that: The rotating assembly includes a third gear (46), a fourth gear (47), a DC motor (48) and a second rotating shaft (49). The DC motor (48) is fixedly arranged on the outer wall of the lifting plate (43). The third gear (46) is fixedly arranged on its output end. The second rotating shaft (49) is rotatably arranged on the top of the lifting plate (43). The fourth gear (47) is fixedly arranged on the second rotating shaft (49). The third gear (46) and the fourth gear (47) are meshed and connected.

9. A plasma arc welding device for stainless steel square tubes according to claim 8, characterized in that: The centering component includes a support frame (50), a servo motor (51), a second turntable (52), two connecting rods (53), two sliding bars (54) and two sliding rails (55). The support frame (50) is fixedly arranged at one end of the second rotating shaft (49) away from the fourth gear (47). The servo motor (51) is inserted on the support frame (50). The second turntable (52) is fixedly arranged at its output end. The two sliding rails (55) are symmetrically arranged on the support frame (50). Each sliding bar (54) is slidably arranged on one sliding rail (55). Each connecting rod (53) is hinged between one end of the turntable and one sliding bar (54). Each clamping plate (16) is fixedly arranged on the outer wall of one sliding bar (54).

10. A plasma arc welding device for stainless steel square tubes according to claim 9, characterized in that: A plurality of anti-slip pads (56) are fixedly arranged on the outer wall of each clamping plate (16).

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