Stainless steel pipe inner and outer flow channel integrated welding equipment and welding method

Abstract

The invention belongs to the technical field of plasma arc welding machines, particularly relates to stainless steel pipe inner and outer flow channel integrated welding equipment and a welding method, and provides the following scheme aiming at the problem that a weak bending state is easily generated in a weldment due to non-uniform thermal expansion in the prior art. Comprising an objective table and a cantilever fixing box, the tops of the objective table and the cantilever fixing box are equal in height, a gap is reserved between the objective table and the cantilever fixing box, a movable fixing frame and a fixed frame are arranged at the ends, close to the opposite ends, of the upper surfaces of the objective table and the cantilever fixing box correspondingly, clamping mechanisms are arranged in the middles of the movable fixing frame and the fixed frame correspondingly, and the joint of two pipeline bodies is located over the gap. Side supporting frames which are symmetrical about the cantilever fixing box are arranged on the front side and the rear side of the cantilever fixing box correspondingly. Welding can be conducted from the inside and the outside of the pipe at the same time during welding, welding spot positions are synchronously conducted in the opposite directions at the same time, and it is helpful for avoiding overall bending of a weldment due to the fact that the single-side thermal expansion amplitude is too large.

Description

An integrated welding equipment and welding method for stainless steel pipe internal and external flow channels Technical Field

[0001] This invention relates to the field of plasma arc welding machine technology, and in particular to an integrated welding equipment and welding method for stainless steel pipe internal and external flow channels. Background Technology

[0002] In order to improve welding efficiency and ensure the integrity and uniformity of the weld, current automated arc welding equipment has also introduced a method of simultaneous internal and external welding when welding the joints of stainless steel pipes. That is, the welding points of the inner and outer welding guns are at the same point. Then, during welding, the welding equipment or the workpiece is rotated to complete the welding.

[0003] While this welding method increases the welding speed, it does not take into account the problem of thermal deformation. That is, if one side of the stainless steel pipe is welded, that side will expand due to heat, while the other side, which is not welded, will not expand or deform, or the degree of expansion and deformation will be small. This will cause the two stainless steel pipes to switch from a coaxial state to a slight bending state. Therefore, we propose a new type of integrated welding equipment and welding method for stainless steel pipe internal and external flow channels that can avoid the bending state of the weldment caused by uneven thermal expansion. Summary of the Invention

[0004] To overcome the aforementioned deficiencies in the prior art, the present invention aims to provide a device that allows the inner and outer welding devices to rotate in opposite directions, thereby placing the thermal expansion position at a centrally symmetrical position to counteract bending forces. The present invention provides an integrated welding device for the inner and outer channels of a stainless steel pipe, comprising a platform with equal top height and a gap between them, and a cantilever fixing box. A movable fixed frame and a stationary frame are respectively provided on the upper surfaces of the platform and the cantilever fixing box near their opposite ends, and a clamping mechanism is provided in the middle of both the movable fixed frame and the stationary frame. The joint of the two pipe bodies is located directly above the gap. Symmetrical side support frames are provided on the front and rear sides of the cantilever fixing box. The cantilever fixing box includes a counterweight base and a cantilever platform extending towards the platform. The outer wall of the counterweight base is fixed on the side near the platform. The device has a base wheel frame, and three centrally symmetrically distributed limiting rollers are respectively set at the top of the base wheel frame and the two side support frames. The three limiting rollers are rotatably connected to the same driven gear ring. The top of the two side support frames is also provided with long shafts adapted to the positions of the corresponding limiting rollers. A dual-axis motor is embedded in the middle of the upper surface of the counterweight base. The dual-axis motor and the two long shafts are each provided with planetary gears two meshing with the driven gear ring at the end near the stationary frame. A bearing frame is provided above the counterweight base, and a main drive rod coaxial with the driven gear ring is rotatably connected in the bearing frame. The two ends of the main drive rod are respectively provided with a sun gear and an internal welding module. The other end of the two long shafts and the dual-axis motor are each fixed with a planetary gear one meshing with the sun gear. An external welding device is provided on the side of the driven gear ring.

[0005] A further feature of this invention is that the external pipe welding equipment includes a cantilever pipe fixed to the side of the driven gear ring, and an extension arm is slidably inserted into the end of the cantilever pipe away from the driven gear ring. The end of the extension arm is fixed with a vertical channel steel slide rail with its opening facing the movable fixing frame. An electric slider is slidably connected inside the channel steel slide rail, and a welding gun is provided on the side of the electric slider away from the bottom of the channel. Because of the extendable extension arm, two pipe bodies with different diameters can be welded simultaneously with double weld seams.

[0006] A further feature of this invention is that the in-tube welding module includes a grooved slide rail one fixed to the end of the main drive rod with its opening facing the main drive rod. Two symmetrical connecting strips are fixed to the back of the grooved slide rail one, and an intermediate gear is rotatably connected between the two connecting strips. A grooved slide rail two, which is centrally symmetrically distributed with the grooved slide rail one, is fixed to the ends of the two connecting strips away from the grooved slide rail one. A cylindrical slider two is slidably connected in the groove of the grooved slide rail one, and a cylindrical slider one is slidably connected in the groove of the grooved slide rail two. A welding torch two and a caster wheel are respectively provided at the ends of the cylindrical slider one and the cylindrical slider two that are far apart from each other. Vertical and parallel racks are respectively embedded on the opposite sides of the cylindrical slider one and the cylindrical slider two, and both racks mesh with the intermediate gear.

[0007] A further feature of the present invention is that a short shaft is provided in the middle of the intermediate gear, and a knob is fixed at one end of the short shaft. A positioning bolt is screwed onto the surface of the knob near the circumferential edge, so that the cylindrical slider one and cylindrical slider two can be positioned in time after the extension distance is adjusted.

[0008] A further feature of the present invention is that all the circumferential outer walls of the limiting rollers are provided with annular grooves near the center, and the width of the annular grooves is adapted to the width of the driven gear ring, so as to prevent the driven gear ring from axial movement and overall skewing when rotating.

[0009] A further feature of this invention is that the shape of the movable fixed frame is the same as and symmetrical to the main structure of the stationary frame. The movable fixed frame includes a horizontal T-shaped plate and vertical F-shaped plate frames fixed to the front and rear sides of the T-shaped plate. A lifting device is fixed in the middle of the upper surface of the T-shaped plate, and the lifting device includes two lifters. The two lifters are fixed on the same straight line, and the drive ends of the two lifters are fixed with the same double-end drive motor to drive the two lifters to lift simultaneously and synchronously. W-shaped roller frames are fixed at the top of the two lifters, and symmetrical rollers are provided on the upper surfaces of both ends of the two W-shaped roller frames. This not only assists in the rapid axial movement and docking of large-mass pipe bodies, but also allows the two pipe bodies to be raised to the coaxial position of the main drive rod during welding.

[0010] A further feature of this invention is that guide rods are fixed to the lower surface of the W-shaped roller frame near both the front and rear ends, and sliding insertion holes adapted to the diameter of the guide rods are provided on the T-shaped plate; this ensures that the lifting device can lift the pipe body horizontally, thereby assisting in the quick and accurate docking of two pipe bodies.

[0011] A further feature of this invention is that the F-shaped plate frame includes a vertical plate and two forearm rods extending towards the weld. Each of the four forearm rods has a vertical adjusting groove on one side away from the vertical plate. The clamping mechanism includes four symmetrical L-shaped roller frames engaged in the adjusting grooves. The two forearm rods of the F-shaped plate frame closest to the front are respectively fixed with retaining springs on their upper and lower sides, and each retaining spring is fixed with a support roller frame on the side away from the forearm rod. Rollers are provided at the top of the support roller frames and in the middle of all the L-shaped roller frames. Symmetrical steel strips are fixed to the two forearm rods of the F-shaped plate frame away from the support roller frames, and the steel strips near the top pass sequentially through the L-shaped roller frames on their respective sides. The L-shaped roller frame opposite and the roller frame at the top have rollers with fixed pull ropes; near the front of the F-shaped plate frame, a Y-shaped shaft frame extending towards the middle of the two forearm rods is fixed in the middle of the surface, and the end of the Y-shaped shaft frame is rotatably connected to a composite rope winding wheel, which includes a coaxial rope winding roller and a worm gear, with two pull ropes centrally symmetrically distributed and wound on the rope winding roller; a servo motor is fixed below the Y-shaped shaft frame, and a worm gear meshing with the worm gear is fixed at the top of the output shaft of the servo motor; both forearm rods are provided with U-shaped positioning pins for fixing the L-shaped roller frame; by controlling the rotation of the worm gear, the two steel strips can be retracted simultaneously, thereby clamping the pipe body in the middle.

[0012] A further feature of this invention is that the lower surface of the stationary frame is fixed to the top of the cantilever platform of the cantilever fixing box, and the lower surface of the movable fixing frame is slidably connected to the upper surface of the platform. The T-shaped plate of the movable fixing frame has coaxial pin holes near both ends on its horizontal side. The axis of the pin holes is parallel to the axis of the pipe body. Guide rods are slidably inserted into each pin hole, and a connecting block is fixed to one end of the guide rod near the cantilever fixing box. Compression springs are fixed between the connecting block and the side of the T-shaped plate. A reset rope is fixed to the other end of the T-shaped plate. A fixed pulley is embedded in the middle of the end of the platform away from the cantilever fixing box. An electric push rod for pulling the reset rope is provided on the lower surface of the platform. Under the action of the two compression springs, the clamped pipe body can be tightly pressed against the end of the pipe body to be welded, which can assist in pressing the two pipe bodies together during welding. Combined with the stationary nature of the pipe body, this reduces the possibility of deformation in the final shape.

[0013] A method for integrated welding of internal and external flow channels of stainless steel pipes includes the following steps: S1: Before use, the space between the upper and lower steel strips is widened until the pipe body can pass through. Then, the pipe body is pushed along the rollers on the lifting device to the welding position and passes through the lower steel strip. The lifting device is then controlled to lift the pipe body until the center line of the pipe body is concentric with the main drive rod. Then, the servo motor in the clamping mechanism is controlled to reverse so that the upper and lower steel strips are tightened simultaneously until the pipe body in their respective areas is clamped. S2: The electric push rod is controlled to reset. Under the action of two reset springs, the end of the pipe body on the moving fixed frame is tightly pressed against the end of the other pipe body. S3: Then, the plasma arc welding machine and the dual-axis motor connected to welding torch one and welding torch two are started. When welding torch one and welding torch two are welding simultaneously, they move in opposite directions until they each rotate one revolution to complete their respective welding tasks.

[0014] The beneficial effects of this invention are as follows: 1. By setting the in-pipe welding module at the end of the main drive rod and extending into the pipe body, and the driven gear ring that rotates in the opposite direction to the main drive rod, welding can be carried out simultaneously from inside and outside the pipe during welding, and the welding points can be moved synchronously in opposite directions at the same time, which helps to avoid excessive thermal expansion on one side, which would cause the weldment to bend as a whole.

[0015] 2. The extension distance can be freely adjusted according to the inner diameter of the pipe body through the set intermediate gear to adapt to pipe bodies with different inner diameters. Secondly, the universal wheel provides real-time support during welding to ensure that the distance between the nozzle of the welding torch and the weld seam remains unchanged, thus ensuring stable welding quality.

[0016] 3. By setting a reset rope and an electric push rod, during extrusion welding, the clamped pipe body can be tightly pressed against the end of the pipe body to be welded under the action of two compression springs. This can help to press the two pipe bodies together during welding. With the pipe body remaining stationary, the final shape can be less likely to deform. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the integrated welding equipment for internal and external flow channels of stainless steel pipes proposed in this invention during welding; Figure 2 is a schematic diagram of the overall structure of the integrated welding equipment for internal and external flow channels of stainless steel pipes proposed in this invention; Figure 3 is a schematic diagram of the integrated welding equipment for internal and external flow channels of stainless steel pipes proposed in this invention during rotating welding; Figure 4 is a top view of the integrated welding equipment for internal and external flow channels of stainless steel pipes proposed in this invention; Figure 5 is a cross-sectional view along line AA in Figure 4 of the integrated welding equipment for internal and external flow channels of stainless steel pipes proposed in this invention; Figure 6 is a schematic diagram of the overall structure of the movable fixing frame in the integrated welding equipment for internal and external flow channels of stainless steel pipes proposed in this invention; Figure 7 is a semi-sectional three-dimensional structural diagram of the welding module inside the pipe in the integrated welding equipment for internal and external flow channels of stainless steel pipes proposed in this invention; Figure 8 is a schematic diagram of the overall structure of the clamping mechanism in the integrated welding equipment for internal and external flow channels of stainless steel pipes proposed in this invention; Figure 9 is a schematic diagram of the installation position of the lifting device in the integrated welding equipment for internal and external flow channels of stainless steel pipes proposed in this invention; Figure 10 is a schematic diagram of the installation position of the composite winding rope wheel in the integrated welding equipment for internal and external flow channels of stainless steel pipes proposed in this invention.

[0018] In the diagram: 1. Side support frame; 2. Planetary gear one; 3. Long shaft; 4. Sun gear; 5. Limiting roller; 6. Planetary gear two; 7. Driven gear ring; 8. Main drive rod; 9. Cantilever pipe; 901. Extension arm; 10. External welding equipment; 11. Welding torch one; 12. Pipe body; 13. Movable fixed frame; 131. Pin hole; 14. Fixed pulley; 15. Lifting device; 16. Platform; 17. Fixed frame; 18. Bottom wheel frame; 19. Cantilever fixed box; 20. Dual-axis motor ; 21. Composite rope reel; 22. Steel strip; 23. In-pipe welding module; 231. Groove slide rail one; 232. Rack; 233. Welding gun two; 234. Columnar slider one; 235. Intermediate gear; 236. Universal wheel; 237. Columnar slider two; 24. Guide slide rod; 25. Return spring; 26. Servo motor; 27. Y-shaped shaft frame; 28. L-shaped roller frame; 29. ​​Idler roller frame; 30. Worm gear; 31. Pull rope; 32. Adjusting slot; 33. U-shaped positioning pin. Detailed Implementation

[0019] The technical solutions 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.

[0020] In this embodiment, referring to Figures 1-10, this solution specifically provides an integrated welding device for the inner and outer channels of stainless steel pipes, including a platform 16 with equal top height and a gap between them, and a cantilever fixing box 19. A movable fixing frame 13 and a stationary frame 17 are respectively provided on the upper surfaces of the platform 16 and the cantilever fixing box 19 near their opposite ends. A clamping mechanism is provided in the middle of both the movable fixing frame 13 and the stationary frame 17. Pipe bodies 12 with contacting ends and coaxial are fixed in each of the two clamping mechanisms. The joint of the two pipe bodies 12 is located at... Directly above the midpoint between the platform 16 and the cantilever fixing box 19; symmetrical side support frames 1 are respectively provided on the front and rear sides of the cantilever fixing box 19. The cantilever fixing box 19 includes a counterweight base and a cantilever platform extending towards the platform 16. A bottom wheel frame 18 is fixed to the outer wall of the counterweight base near the platform 16, and three centrally symmetrically distributed limiting rollers 5 are respectively provided at the top of the bottom wheel frame 18 and the two side support frames 1. The three limiting rollers 5 are rotatably connected to the same driven gear ring 7. The two side support frames 1 The top of the counterweight base is also equipped with a long shaft 3 that matches the position of the corresponding limiting roller 5. A dual-axis motor 20 is embedded in the middle of the upper surface of the counterweight base. The output shaft of the dual-axis motor 20 and the other two long shafts 3 are centrally symmetrically distributed. The dual-axis motor 20 and the two long shafts 3 are equipped with planetary gears 6 that mesh with the driven gear ring 7 at the ends near the stationary frame 17. A bearing frame is provided above the counterweight base, and a main drive rod 8 coaxial with the driven gear ring 7 is rotatably connected in the bearing frame. Sun gears 4 are respectively provided at both ends of the main drive rod 8. The inner welding module 23, the two long shafts 3, and the other end of the dual-shaft motor 20 are all fixed with planetary gears 2 that mesh with the sun gear 4; the side of the driven gear ring 7 is provided with an outer welding device 10; through the inner welding module 23 set at the end of the main drive rod 8 and extending into the pipe body 12, and the driven gear ring 7 which rotates in the opposite direction to the main drive rod 8, welding can be carried out simultaneously from inside and outside the pipe, and the welding points can be moved synchronously in opposite directions at the same time, which helps to avoid excessive thermal expansion on one side causing the weldment to bend as a whole.

[0021] Referring to Figures 5 and 7, the external pipe welding equipment 10 includes a cantilever pipe 9 fixed to the side of the driven gear ring 7, and an extension arm 901 is slidably inserted into the end of the cantilever pipe 9 away from the driven gear ring 7. The end of the extension arm 901 is fixed with a vertical channel steel slide rail with its opening facing the movable fixing frame 13. An electric slider is slidably connected inside the channel steel slide rail, and a welding gun 11 is provided on the side of the electric slider away from the bottom of the channel. Because of the extension arm 901 that can be extended, two pipe bodies 12 with different diameters can be welded simultaneously with double weld seams.

[0022] Referring to Figure 7, the in-pipe welding module 23 includes a grooved slide rail 231 fixed to the end of the main drive rod 8 with its opening facing the main drive rod 8. Two symmetrical connecting strips are fixed to the back of the grooved slide rail 231, and an intermediate gear 235 is rotatably connected between the two connecting strips. A grooved slide rail 234, which is centrally symmetrical to the grooved slide rail 231, is fixed to the end of the two connecting strips away from the grooved slide rail 231. A cylindrical slider 237 is slidably connected in the groove of the grooved slide rail 231, and a cylindrical slider 234 is slidably connected in the groove of the grooved slide rail 234. A welding torch 233 and a caster wheel are respectively provided at the ends of the cylindrical slider 234 and the cylindrical slider 237 that are away from each other. 236; Vertical and parallel racks 232 are respectively embedded on the opposite side of cylindrical slider 1 234 and cylindrical slider 237. Both racks 232 mesh with the intermediate gear 235. Through the intermediate gear 235, the cylindrical slider 1 234 and cylindrical slider 237 can be moved in opposite directions according to the inner diameter of the pipe body 12 by controlling the rotation of the intermediate gear 235, thereby changing the distance between the universal wheel 236 and the end of the welding torch 233, so that the distance can be adapted to pipe bodies 12 with different inner diameters. Secondly, the universal wheel 236 provides real-time support during welding, ensuring that the distance between the nozzle of the welding torch 233 and the weld seam remains unchanged, ensuring stable welding quality.

[0023] Referring to Figure 7, a short shaft is provided in the middle of the intermediate gear 235, and a knob is fixed at one end of the short shaft. A positioning bolt is screwed onto the surface of the knob near the circumferential edge, which can position the cylindrical slider 234 and the cylindrical slider 237 in time after the extension distance is adjusted.

[0024] Referring to Figures 2-5, all the outer circumference of the limiting rollers 5 are provided with annular grooves near the center, and the width of the annular grooves is matched with the width of the driven gear ring 7 to prevent the driven gear ring 7 from axial movement and overall skewing when rotating.

[0025] Referring to Figures 5 and 9, the movable fixed frame 13 has the same and symmetrical shape as the main structure of the stationary frame 17. The movable fixed frame 13 includes a horizontal T-shaped plate and vertical F-shaped plate frames fixed to the front and rear sides of the T-shaped plate. A lifting device 15 is fixed in the middle of the upper surface of the T-shaped plate. The lifting device 15 includes two lifters, which are fixed on the same straight line. The drive ends of the two lifters are fixed with the same double-end drive motor to drive the two lifters to lift simultaneously and synchronously. W-shaped roller frames are fixed at the top of the two lifters, and symmetrical rollers are provided on the upper surfaces of both ends of the two W-shaped roller frames. This not only assists the rapid axial movement and docking of the large-mass pipe body 12, but also allows the two pipe bodies 12 to be raised to the coaxial position of the main drive rod 8 during welding.

[0026] Referring to Figure 9, guide rods are fixed on the lower surface of the W-shaped roller frame near both the front and rear ends, and sliding insertion holes with a diameter matching the guide rods are provided on the T-shaped plate; this ensures that the lifting device 15 can lift the pipe body 12 horizontally, thereby assisting the two pipe bodies 12 to connect quickly and accurately.

[0027] Referring to Figures 8-10, the F-shaped plate frame includes a vertical plate and two forearm rods extending towards the weld. Vertical adjustment slots 32 are provided on the opposite sides of the four forearm rods away from the vertical plate. The clamping mechanism includes four symmetrical L-shaped roller frames 28 that are engaged within the adjustment slots 32. The upper and lower sides of the two forearm rods of the F-shaped plate frame closest to the front are respectively fixed with abutment springs, and roller frames 29 are fixed to the ends of the abutment springs away from the forearm rods. Rollers are provided at the top of the roller frames 29 and in the middle of all the L-shaped roller frames 28. Symmetrical steel strips 22 are fixed to the two forearm rods of the F-shaped plate frame away from the roller frames 29. The steel strip 22 near the top passes sequentially through the rollers in the L-shaped roller frame 28 on its side, the opposite L-shaped roller frame 28, and the top roller frame 29, and is fixed with a pull rope 31. A Y-shaped shaft frame 27 extending between the two forearm rods is fixed to the center of the surface of the F-shaped frame near the front. A composite rope winding wheel 21 is rotatably connected to the end of the Y-shaped shaft frame 27. The composite rope winding wheel 21 includes a coaxial rope winding roller and a worm gear. Two pull ropes 31 are centrally symmetrically distributed and wound on the rope winding roller. A servo motor 26 is fixed below the Y-shaped shaft frame 27. A worm 30 that meshes with the worm gear is fixed to the top of the output shaft of the servo motor 26. U-shaped positioning pins 33 for fixing the L-shaped roller frame 28 are provided at the ends of the two forearm rods. By controlling the rotation of the worm gear, the two pull ropes 31 wound on the composite rope winding wheel 21 are wound up, and then the corresponding steel strip 22 is pulled towards the middle at the same time, and the steel strip 22 attached to the surface of the pipe body 12 is slowly tightened, and then the pipe body 12 in the middle is clamped.

[0028] Referring to Figures 6 and 8-10, the lower surface of the stationary frame 17 is fixed to the top of the cantilever platform of the cantilever fixed box 19, and the lower surface of the movable fixed frame 13 is slidably connected to the upper surface of the platform 16. The horizontal side of the T-shaped plate of the movable fixed frame 13 has coaxial pin holes 131 near both ends. The axis of the pin holes 131 is parallel to the axis of the pipe body 12. Guide rods 24 are slidably inserted into each pin hole 131, and a connecting block is fixed to one end of the guide rod 24 near the cantilever fixed box 19. The connecting block is connected to the side of the T-shaped plate. Compression springs are fixed between the two parts, and a reset rope is fixed to the other end of the T-shaped plate. A fixed pulley 14 is embedded in the middle of the end of the platform 16 away from the cantilever fixing box 19. An electric push rod for pulling the reset rope is provided on the lower surface of the platform 16. Due to the reset rope and electric push rod, when the extrusion welding is performed, the two pipe bodies 12 to be welded tend to move towards the contact surface and then press together. With the pipe body 12 remaining stationary, the possibility of deformation in the final shape can be reduced.

[0029] A method for integrated welding of internal and external flow channels of stainless steel pipes includes the following steps: S1: Before use, the space between the upper and lower steel strips 22 is opened until the pipe body 12 can pass through. Then, the pipe body 12 is pushed along the roller on the lifting device 15 to the welding position and passes through the lower steel strip 22. The lifting device 15 is then controlled to lift the pipe body 12 until the center line of the pipe body 12 is concentric with the main drive rod 8. Then, the servo motor 26 in the clamping mechanism is controlled to reverse so that the upper and lower steel strips 22 are tightened at the same time until the pipe body 12 in their respective areas is clamped. S2: The electric push rod is controlled to reset. Under the action of the two reset springs 25, the end of the pipe body 12 on the moving fixing frame 13 is tightly pressed against the end of the other pipe body 12. S3: Then, the plasma arc welding machine and the dual-axis motor 20 connected to the welding gun 11 and welding gun 233 are started. When welding gun 11 and welding gun 233 are welding at the same time, they move in opposite directions until they rotate one revolution to complete their respective welding tasks.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An integrated welding device for the inner and outer channels of a stainless steel pipe, comprising a platform (16) with equal top height and a gap between them, and a cantilevered fixing box (19), characterized in that, The upper surfaces of the platform (16) and the cantilever fixing box (19) are respectively provided with a movable fixing frame (13) and a stationary frame (17) near their opposite ends, and a clamping mechanism is provided in the middle of both the movable fixing frame (13) and the stationary frame (17). The joint of the two pipe bodies (12) is located directly above the gap. The front and rear sides of the cantilever fixing box (19) are respectively provided with side support frames (1) symmetrical about the cantilever fixing box (19). The cantilever fixing box (19) includes a counterweight base and a cantilever platform extending from the top to the platform (16). The outer wall of the counterweight base is fixed with a bottom wheel frame (18) near the platform (16), and the top of the bottom wheel frame (18) and the two side support frames (1) are respectively provided with three centrally symmetrically distributed limiting rollers (5). The three limiting rollers (5) are rotatably connected to the same driven gear. The top of the ring (7) and the two side support frames (1) are also provided with long shafts (3) that are adapted to the corresponding limiting rollers (5). The upper surface of the counterweight base is fitted with a dual-axis motor (20). The dual-axis motor (20) and the two long shafts (3) are provided with planetary gears (6) that mesh with the driven gear ring (7) at the end of the stationary frame (17). The counterweight base is provided with a bearing frame above it. The bearing frame is rotatably connected with a main transmission rod (8) that is coaxial with the driven gear ring (7). The two ends of the main transmission rod (8) are respectively provided with a sun gear (4) and an in-tube welding module (23). The other ends of the two long shafts (3) and the dual-axis motor (20) are fixed with planetary gears (2) that mesh with the sun gear (4). The side of the driven gear ring (7) is provided with an external welding device (10).

2. The integrated welding equipment for internal and external flow channels of stainless steel pipes according to claim 1, characterized in that, The external welding equipment (10) includes a cantilever tube (9) fixed to the side of the driven gear ring (7), and an extension arm (901) is slidably inserted at one end of the cantilever tube (9) away from the driven gear ring (7), and a vertical channel steel slide rail with an opening facing the movable fixed frame (13) is fixed at the end of the extension arm (901). An electric slider is slidably connected inside the channel steel slide rail, and a welding gun (11) is provided on the side of the electric slider away from the bottom of the channel.

3. The integrated welding equipment for internal and external flow channels of stainless steel pipes according to claim 2, characterized in that, The in-pipe welding module (23) includes a grooved slide rail one (231) fixed to the end of the main drive rod (8) and with its opening facing the main drive rod (8). Two mutually symmetrical connecting strips are fixed to the back of the grooved slide rail one (231), and an intermediate gear (235) is rotatably connected between the two connecting strips. A grooved slide rail two is fixed to the end of the two connecting strips away from the grooved slide rail one (231) and is centrally symmetrically distributed with the grooved slide rail one (231). A cylindrical slider two (237) is slidably connected in the groove of the slide rail two, and a cylindrical slider one (234) is slidably connected in the groove of the slide rail two. A welding gun two (233) and a caster wheel (236) are respectively provided at the ends of cylindrical slider one (234) and cylindrical slider two (237) that are far apart. Vertical and parallel racks (232) are respectively embedded on the opposite side of cylindrical slider one (234) and cylindrical slider two (237), and both racks (232) mesh with the intermediate gear (235).

4. The integrated welding equipment for internal and external flow channels of stainless steel pipes according to claim 3, characterized in that, The intermediate gear (235) has a short shaft in the middle, and a knob is fixed at one end of the short shaft. A positioning bolt is screwed onto the surface of the knob near the circumferential edge.

5. The integrated welding equipment for internal and external flow channels of stainless steel pipes according to claim 4, characterized in that, All of the aforementioned limiting rollers (5) have annular grooves reserved near the center on their outer circumference, and the width of the annular grooves is adapted to the width of the driven gear ring (7).

6. The integrated welding equipment for internal and external flow channels of stainless steel pipes according to claim 5, characterized in that, The shape of the movable fixed frame (13) is the same as and symmetrical to the main structure of the stationary frame (17). The movable fixed frame (13) includes a horizontal T-shaped plate and vertical F-shaped plate frames fixed on the front and rear sides of the T-shaped plate. A lifting device (15) is fixed in the middle of the upper surface of the T-shaped plate. The lifting device (15) includes two lifters. The two lifters are fixed on the same straight line. The drive ends of the two lifters are fixed with the same double-end drive motor to drive the two lifters to lift at the same time and in a synchronous manner. W-shaped roller frames are fixed at the top of the two lifters. Symmetrical rollers are provided on the upper surfaces of the two ends of the two W-shaped roller frames.

7. The integrated welding equipment for internal and external flow channels of stainless steel pipes according to claim 6, characterized in that, The lower surface of the W-shaped roller frame is fixed with guide rods near both the front and rear ends, and the T-shaped plate is provided with sliding holes that match the diameter of the guide rods.

8. The integrated welding equipment for internal and external flow channels of stainless steel pipes according to claim 7, characterized in that, The F-shaped plate frame includes a vertical plate and two forearm rods extending towards the weld. Each of the four forearm rods has a vertical adjusting groove (32) on one side away from the vertical plate. The clamping mechanism includes four symmetrical L-shaped roller frames (28) engaged in the adjusting grooves (32). The two forearm rods of the F-shaped plate frame closest to the front are respectively fixed with a retaining spring on their upper and lower sides. Each retaining spring has a roller frame (29) fixed at the end away from the forearm rod. Rollers are provided at the top of the roller frame (29) and in the middle of all the L-shaped roller frames (28). Symmetrical steel strips (22) are fixed on the two forearm rods of the F-shaped plate frame away from the roller frame (29). The steel strips (22) near the top pass sequentially through the L-shaped roller frames on their respective sides. 28) The L-shaped roller frame (28) on the opposite side and the roller frame (29) at the top are equipped with rollers and pull ropes (31); the F-shaped plate frame near the front is fixed with a Y-shaped shaft frame (27) extending to the middle of the two forearm rods, and the end of the Y-shaped shaft frame (27) is rotatably connected to a composite rope winding wheel (21), the composite rope winding wheel (21) includes a coaxial rope winding roller and a worm gear, and the two pull ropes (31) are centrally symmetrically distributed and wound on the rope winding roller; a servo motor (26) is fixed below the Y-shaped shaft frame (27), and a worm (30) that meshes with the worm gear is fixed at the top of the output shaft of the servo motor (26); U-shaped positioning pins (33) are provided at the ends of the two forearm rods to fix the L-shaped roller frame (28).

9. The integrated welding equipment for internal and external flow channels of stainless steel pipes according to claim 8, characterized in that, The lower surface of the stationary frame (17) is fixed to the top of the cantilever platform of the cantilever fixed box (19), and the lower surface of the movable fixed frame (13) is slidably connected to the upper surface of the platform (16). The horizontal side of the T-shaped plate of the movable fixed frame (13) is provided with coaxial pin holes (131) near both ends. The axis of the pin holes (131) is parallel to the axis of the pipe body (12). Guide slide rods (24) are slidably inserted in the pin holes (131). A connecting block is fixed at one end of the guide slide rod (24) near the cantilever fixed box (19). A compression spring is fixed between the connecting block and the side of the T-shaped plate. A reset rope is fixed at the other end of the T-shaped plate. A fixed pulley (14) is embedded in the middle of the end of the platform (16) away from the cantilever fixed box (19). An electric push rod for pulling the reset rope is provided on the lower surface of the platform (16).

10. A method for integrated welding of internal and external flow channels of stainless steel pipes, applied to the integrated welding equipment for internal and external flow channels of stainless steel pipes as described in claim 9, characterized in that, Includes the following steps: S1: Before use, first open the space between the upper and lower steel strips (22) until the pipe body (12) can pass through. Then, push the pipe body (12) along the roller on the lifting device (15) to the welding position and pass through the lower steel strip (22). Then control the lifting device (15) to lift the pipe body (12) until the center line of the pipe body (12) is concentric with the main drive rod (8). Then control the servo motor (26) in the clamping mechanism to reverse so that the upper and lower steel strips (22) are tightened at the same time until Clamp the pipe body (12) in their respective areas; S2: Control the electric push rod to reset, and under the action of the two reset springs (25), make the end of the pipe body (12) on the moving fixed frame (13) tightly squeeze the end of the other pipe body (12); S3: Then start the plasma arc welding machine and the dual-axis motor (20) connected to welding gun one (11) and welding gun two (233). When welding gun one (11) and welding gun two (233) are welding at the same time, they move in opposite directions until they rotate one revolution to complete their respective welding tasks.

Images