A welding device for pressure pipeline installation and a method thereof

Abstract

The application discloses a welding device for pressure pipeline installation and a method thereof, and belongs to the technical field of pipeline welding. The welding device comprises a welding gun and an annular driving assembly. The annular driving assembly is connected with a position compensation assembly for radial position compensation. The position compensation assembly is connected with an adjustable reciprocating driving assembly. The adjustable reciprocating driving assembly comprises a box body, a rotary driving assembly, a stepless adjusting assembly and a reciprocating moving assembly. The box body is fixedly connected with the driving end of the position compensation assembly. The rotary driving assembly is fixedly connected with the box body. The rotary driving assembly is connected with the stepless adjusting assembly. The stepless adjusting assembly is connected with the reciprocating moving assembly. The reciprocating moving assembly is slidably connected with the box body. The welding gun is fixedly installed at the end of the reciprocating moving assembly, which is away from the box body. The application is more suitable for the requirements of multi-layer welding of pressure pipeline welds and is beneficial to actual use.

Description

Technical Field

[0001] This invention relates to the field of pipeline welding technology, and specifically to a welding apparatus and method for installing pressure pipelines. Background Technology

[0002] Pressure pipelines are pipeline systems used to transport gases, liquids, or gas-liquid mixtures, generating high internal pressure. Pressure pipelines require welding during installation.

[0003] For example, Chinese patent CN104139265B provides an automatic welding mechanism for pipe outer walls using a flexible track. Two cam seats are connected by a pin shaft, and the angle is adjustable, suitable for different pipe diameters. They are fixed to the track by a cam locking mechanism. The angle adjustment plate, wheel seats, and cam seats together form the basic frame of the welding carriage. The welding carriage is gear-driven and can move in a uniform circular motion around the flexible track. The welding torch radial movement mechanism is mounted on the angle adjustment plate and is manually adjustable. The welding torch axial movement mechanism is connected to the radial movement mechanism via a radial movement cover plate. The axial movement drive motor drives the rack to move, realizing the axial movement of the welding torch. The welding torch oscillation mechanism is mounted at the front end of the rack support seat. The welding torch is directly driven by a stepper motor to oscillate back and forth around the weld center. It has advantages such as miniaturization, modularity, light weight, uniform weight distribution, economic practicality, simple control, stable operation, and easy compatibility with various traveling mechanisms of pipe outer wall welding machines.

[0004] However, when the welding torch swings, the welding end of the torch traces an arc. In actual welding, horizontal swinging is required to ensure that the weld fills the weld edge fully. At the same time, the weld width of the pressure pipeline is relatively large, and the swing angle required when swinging in the wider part is larger, which will further affect the filling effect. In addition, the elastic track is supported by n pads. Due to the support points of the two sets of pads, the surface of the elastic track between the pads tends to be planar. In fact, the shape formed by the elastic track is (n-1)-sided, and the elastic track cannot form a circle. The distance from the welding torch to the central axis of the pressure pipeline is the largest when the welding torch is at the pad, and the distance from the welding torch to the central axis of the pressure pipeline is the smallest when the welding torch is at the midpoint between the two sets of pads. This makes the welding trajectory (n-1)-sided, and a circular weld cannot be formed.

[0005] Based on this, the present invention designs a welding device and method for installing pressure pipelines to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a welding device and method for installing pressure pipelines.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A welding apparatus for installing pressure pipelines includes a welding torch and an annular drive assembly; The annular drive assembly for driving the welding torch to move circumferentially along the pressure pipe is connected to a position compensation assembly for radial position compensation. The position compensation component is connected to an adjustable reciprocating drive component for reciprocating drive and stepless adjustment of reciprocating distance; The adjustable reciprocating drive assembly includes a housing, a rotary drive assembly, a stepless adjustment assembly, and a reciprocating motion assembly. The housing is fixedly connected to the drive end of the position compensation assembly, the rotary drive assembly is fixedly connected to the housing, the rotary drive assembly is connected to the stepless adjustment assembly, the stepless adjustment assembly is connected to the reciprocating motion assembly, the reciprocating motion assembly is slidably connected to the housing, and the welding torch is fixedly installed at the end of the reciprocating motion assembly away from the housing.

[0008] Furthermore, the annular drive assembly includes an assembled annular support assembly, a drive assembly, and an L-shaped support plate. The assembled annular support assembly is in close contact with the pressure pipeline, the assembled annular support assembly is connected to the drive assembly, the drive assembly is connected to the L-shaped support plate, and the position compensation assembly is connected to the L-shaped support plate.

[0009] Furthermore, the assembled ring support assembly includes two sets of arc-shaped guide plates, multiple sets of support pads, a set of hinges, two sets of connecting blocks, and a set of locking pins. The ends of the two sets of arc-shaped guide plates near the inner wall of the pressure pipe are rotatably connected by hinges, and the other ends of the two sets of arc-shaped guide plates near the inner wall of the pressure pipe are fixedly connected to the two sets of connecting blocks one by one. The two sets of connecting blocks are fixedly connected by locking pins. The multiple sets of support pads are divided into two parts, and the support pads in each part are fixedly installed at equal intervals on the arc-shaped guide plates near the inner wall of the pressure pipe. The arc-shaped guide plates are connected to the drive assembly.

[0010] Furthermore, the drive assembly includes a third motor, a third horizontal shaft, guide rollers, a gear ring, and a fourth mounting plate. The arc-shaped guide plate has equally spaced toothed grooves on the side wall away from the pressure pipe. Four sets of guide rollers are symmetrically fixedly installed at the bottom of the L-shaped support plate. The guide rollers are rotatably connected to the side wall of the arc-shaped guide plate. The side wall of the L-shaped support plate is fixedly connected to the third motor. The drive end of the third motor is fixedly connected to the third horizontal shaft. The third horizontal shaft is fixedly connected to the gear ring, and the gear ring meshes with the toothed grooves. The third horizontal shaft is rotatably connected to the fourth mounting plate, and the fourth mounting plate is fixedly installed at the bottom of the L-shaped support plate.

[0011] Furthermore, the position compensation component includes a fourth motor, a movable block, a second threaded rod, a fifth mounting plate, and a guide rail assembly. The fourth motor is fixedly mounted on the top of the L-shaped support plate. The top of the second threaded rod is fixedly connected to the drive end of the fourth motor, and the bottom of the second threaded rod is rotatably connected to the fifth mounting plate. The fifth mounting plate is fixedly connected to the side wall of the L-shaped support plate. The movable block is threadedly connected to the second threaded rod through a fixedly connected threaded sleeve. The guide rail of the guide rail assembly is fixedly connected to the side wall of the L-shaped support plate. The slider of the guide rail assembly is fixedly connected to the movable block, and the movable block is fixedly connected to the housing.

[0012] Furthermore, the rotation drive assembly includes a turntable, a second motor, a second mounting plate, a cross cylinder, and a transmission assembly. The second motor and the second mounting plate are fixedly installed at the bottom of the housing. The second mounting plate is rotatably connected to the cross cylinder via a bearing. The end of the cross cylinder away from the second motor is coaxially fixedly connected to the turntable. The cross cylinder and the turntable are connected to a stepless adjustment assembly. The second motor is driven by the cross cylinder via the transmission assembly.

[0013] Furthermore, the stepless adjustment assembly includes a limiting sleeve, a first motor, a first bevel gear, a second bevel gear, a second horizontal shaft, a sliding seat, a third mounting plate, and a first threaded rod. The first motor is fixedly installed at the end of the horizontal cylinder near the second motor. The drive end of the first motor is fixedly connected to the second horizontal shaft, and the second horizontal shaft is coaxially rotatably connected to the horizontal cylinder through a bearing. The end of the second horizontal shaft away from the first motor is fixedly connected to the first bevel gear, and the first bevel gear meshes with the second bevel gear. The bottom of the first threaded rod is fixedly connected to the second bevel gear, and the top of the first threaded rod is rotatably connected to the third mounting plate through a connected bearing. The sliding seat is threadedly connected to the first threaded rod through a threaded sleeve, and the sliding seat is limited and slidably connected to two sets of limiting sleeves. The side wall of the turntable away from the second motor is fixedly connected to the limiting sleeve, and the reciprocating motion assembly is fixedly connected to the sliding seat.

[0014] Furthermore, the reciprocating moving assembly includes a drive rod, a slide rod, a mounting base, a square frame, a first horizontal shaft, and a ball bearing. The first horizontal shaft is fixedly connected to the slide base away from the side wall of the second motor. The inner ring of the ball bearing is fixedly connected to the first horizontal shaft, and the outer ring of the ball bearing is slidably connected to the inner wall of the square frame. The drive rod is located at the end of the housing and is fixedly connected to the square frame. The end of the drive rod away from the housing is fixedly connected to the mounting base. The end of the slide rod away from the second motor is fixedly connected to the mounting base. The welding torch is fixedly mounted on the mounting base. Both the slide rod and the drive rod are slidably connected to the housing.

[0015] Furthermore, the moving part of the annular drive assembly is connected to a distance monitoring component for the distance monitoring component to the outer wall of the pressure pipe, and the distance monitoring component senses the orientation toward the central axis of the pressure pipe.

[0016] A method of using a welding apparatus for installing pressure pipelines includes the following steps: Step 1: Install the ring drive assembly onto the pressure pipeline, and install the welding torch onto the reciprocating moving component of the adjustable reciprocating drive assembly; Step 2: Activate the stepless adjustment component according to the width of the weld layer. The stepless adjustment component adjusts the unidirectional movement distance of the reciprocating component until the unidirectional movement distance of the reciprocating component matches the width of the weld layer. Step 3: The ring drive component drives the position compensation component to move, the position compensation component drives the housing of the adjustable reciprocating drive component to move, and at the same time, the rotation drive component drives the stepless adjustment component to rotate, the stepless adjustment component drives the reciprocating motion component to move back and forth, the reciprocating motion component drives the welding torch to move back and forth, and the welding torch moves along the pressure pipeline while moving back and forth along the welding layer, and the welding layer is welded in a fish scale pattern. Step 4: After the first welding layer is completed, the position compensation component adjusts the reciprocating drive component to move a distance equal to the thickness of one welding layer away from the circumferential axis of the pressure pipeline. Step 5: Repeat steps 2-4 until all weld layers are completed.

[0017] Beneficial effects: This invention installs a ring drive assembly on a pressure pipeline and a welding torch on the reciprocating moving component of an adjustable reciprocating drive assembly. The stepless adjustment assembly is activated according to the weld layer width, adjusting the unidirectional moving distance of the reciprocating moving component until it matches the weld layer width. The ring drive assembly drives the position compensation assembly to move, which in turn moves the housing of the adjustable reciprocating drive assembly. Simultaneously, the rotation drive assembly drives the stepless adjustment assembly to rotate, which in turn drives the reciprocating moving component to move back and forth, which in turn drives the welding torch to move back and forth. This allows the welding torch to rotate along the pressure pipeline while simultaneously moving back and forth along the weld layer, achieving a fish-scale weld. After one weld layer is completed, the position compensation assembly adjusts the adjustable reciprocating drive assembly to move a distance equal to the weld layer thickness away from the circumferential axis of the pressure pipeline. The stepless adjustment assembly adjusts the unidirectional moving distance of the reciprocating moving component to meet the welding width requirements of the next weld layer, continuing the welding of the next weld layer. This process is repeated until all weld layers are completed, better meeting the requirements for multi-layer welding of pressure pipeline welds and facilitating practical use. In the welding process of this invention, the distance monitoring component monitors the distance from the moving part of the annular drive component to the outer wall of the pressure pipe. If the distance value is less than the set distance value between the distance monitoring component and the outer wall of the pressure pipe when the support part of the annular drive component is circular, it indicates that the distance from the support part of the annular drive component to the central axis of the pressure pipe at this point is less than the distance from the support part of the annular drive component to the central axis of the pressure pipe at this point when the support part of the annular drive component is circular. The difference between the distance from the support part of the annular drive component to the central axis of the pressure pipe at this point when the support part of the annular drive component is circular and the distance from the support part of the annular drive component to the central axis of the pressure pipe at this point is calculated. When the welding torch moves to this point, the position compensation component drives the welding torch to move away from the central axis of the pressure pipe by the difference distance. When the support part of the annular drive component is not circular, it can ensure that the welding torch always moves along a circular trajectory, thus ensuring the welding quality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 A three-dimensional representation of a welding apparatus for installing pressure pipelines according to the present invention. Figure 1 ; Figure 2 This is a front view of a welding apparatus for installing pressure pipelines according to the present invention; Figure 3 This is a left view of a welding apparatus for installing pressure pipelines according to the present invention; Figure 4 A three-dimensional representation of a welding apparatus for installing pressure pipelines according to the present invention. Figure 2 ; Figure 5 A three-dimensional representation of a welding apparatus for installing pressure pipelines according to the present invention. Figure 3 ; Figure 6 The three-dimensional representation of the adjustable reciprocating drive assembly of the present invention Figure 1 ; Figure 7 The three-dimensional representation of the adjustable reciprocating drive assembly of the present invention Figure 2 ; Figure 8 The three-dimensional representation of the adjustable reciprocating drive assembly of the present invention Figure 3 ; Figure 9 for Figure 2 Enlarged view of point A in the middle; Figure 10 for Figure 3 Enlarged view of point B in the middle; Figure 11 This is a circuit connection block diagram of the present invention.

[0020] The labels in the diagram represent: 1. Welding torch; 2. Distance monitoring assembly; 21. Distance sensor; 22. First mounting plate; 23. Controller; 3. Adjustable reciprocating drive assembly; 31. Housing; 32. Drive rod; 33. Slide rod; 34. Mounting base; 35. Square frame; 36. First horizontal shaft; 37. Ball bearing; 38. Limit sleeve; 39. Turntable; 310. First motor; 311. Second motor; 312. First bevel gear; 313. Second mounting plate; 314. Horizontal cylinder; 315. Transmission assembly; 316. Second bevel gear; 317. 318. Second horizontal axis; 319. Sliding seat; 320. Third mounting plate; 321. First threaded rod; 4. Ring drive assembly; 41. Third motor; 42. Third horizontal axis; 43. Guide roller; 44. Arc-shaped guide plate; 45. L-shaped support plate; 46. Support pad; 47. Hinge; 48. Connecting block; 49. Gear groove; 410. Gear ring; 411. Fourth mounting plate; 412. Locking pin; 5. Position compensation assembly; 51. Fourth motor; 52. Movable block; 53. Second threaded rod; 54. Fifth mounting plate; 55. Guide rail assembly. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] The present invention will be further described below with reference to embodiments.

[0023] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0024] Example 1, please refer to the appendix of the instruction manual. Figures 1-3 A welding device for installing pressure pipelines, comprising a welding torch 1 and an annular drive assembly 4; The annular drive assembly 4, which drives the welding torch 1 to move circumferentially along the pressure pipeline, is connected to a position compensation assembly 5 for radial position compensation. The position compensation component 5 is connected to an adjustable reciprocating drive component 3 for reciprocating drive and stepless adjustment of reciprocating distance; The adjustable reciprocating drive assembly 3 includes a housing 31, a rotary drive assembly, a stepless adjustment assembly, and a reciprocating motion assembly. The housing 31 is fixedly connected to the drive end of the position compensation assembly 5. The rotary drive assembly is fixedly connected to the housing 31. The rotary drive assembly is connected to the stepless adjustment assembly. The stepless adjustment assembly is connected to the reciprocating motion assembly. The reciprocating motion assembly is slidably connected to the housing 31. The welding torch 1 is fixedly installed at the end of the reciprocating motion assembly away from the housing 31. The moving part of the ring drive assembly 4 is connected to a distance monitoring assembly 2 for distance monitoring assembly 2 to the outer wall of the pressure pipe, and the distance monitoring assembly 2 senses the center axis of the pressure pipe.

[0025] The annular drive assembly 4 is installed on the pressure pipeline, and the welding torch 1 is installed on the reciprocating movement component of the adjustable reciprocating drive assembly 3. The stepless adjustment assembly is activated according to the weld layer width. The stepless adjustment assembly adjusts the unidirectional movement distance of the reciprocating movement component until it matches the weld layer width. The annular drive assembly 4 drives the position compensation assembly 5 to move, which in turn drives the housing 31 of the adjustable reciprocating drive assembly 3 to move. Simultaneously, the rotation drive assembly drives the stepless adjustment assembly to rotate, which in turn drives the reciprocating movement component to move back and forth. The reciprocating movement component then drives the welding torch 1 to move back and forth, allowing the welding torch 1 to rotate along the pressure pipeline while simultaneously moving back and forth along the weld layer, achieving a fish-scale weld. After one weld layer is completed, the position compensation assembly 5 adjusts the adjustable reciprocating drive assembly 3 to move a distance equal to the weld layer thickness away from the circumferential axis of the pressure pipeline. The stepless adjustment assembly adjusts the unidirectional movement distance of the reciprocating movement component to meet the weld width requirements of the next weld layer, and the welding of the next weld layer continues. This process is repeated until the weld layer is completed. Once all welding layers are completed, it better meets the requirements for multi-layer welding of pressure pipeline welds, which is beneficial for practical use. During the welding process, the distance monitoring component 2 monitors the distance from the moving part of the ring drive component 4 to the outer wall of the pressure pipeline. If the distance value is less than the set value of the distance monitoring component 2 to the outer wall of the pressure pipeline when the support part of the ring drive component 4 is circular, it means that the distance from the support part of the ring drive component 4 to the central axis of the pressure pipeline at this point is less than the distance from the support part of the ring drive component 4 to the central axis of the pressure pipeline at this point when the support part of the ring drive component 4 is circular. The difference between the distance from the support part of the ring drive component 4 to the central axis of the pressure pipeline at this point when the support part of the ring drive component 4 is circular and the distance from the support part of the ring drive component 4 to the central axis of the pressure pipeline at this point is calculated. When the welding torch 1 moves to this point, the position compensation component 5 drives the welding torch 1 to move away from the central axis of the pressure pipeline by the difference distance. When the support part of the ring drive component 4 is not circular, it can be ensured that the welding torch 1 always moves along a circular trajectory, thus ensuring the welding quality.

[0026] Please refer to the accompanying drawings in the instruction manual. Figures 1-5 , Figure 9 and Figure 10 The annular drive assembly 4 includes an assembled annular support assembly, a drive assembly, and an L-shaped support plate 45. The assembled annular support assembly is in close contact with the pressure pipeline. The assembled annular support assembly is connected to the drive assembly. The drive assembly is connected to the L-shaped support plate 45. The position compensation assembly 5 is connected to the L-shaped support plate 45. The assembled ring support assembly includes two sets of arc-shaped guide plates 44, multiple sets of support pads 46, a set of hinges 47, two sets of connecting blocks 48, and a set of locking pins 412. The ends of the two sets of arc-shaped guide plates 44 near the inner wall of the pressure pipe are rotatably connected by hinges 47. The other ends of the two sets of arc-shaped guide plates 44 near the inner wall of the pressure pipe are fixedly connected to the two sets of connecting blocks 48 one by one. The two sets of connecting blocks 48 are fixedly connected by locking pins 412. The multiple sets of support pads 46 are divided into two parts, and the support pads 46 in each part are fixedly installed at equal intervals on the arc-shaped guide plates 44 near the inner wall of the pressure pipe. The arc-shaped guide plates 44 are connected to the drive assembly. The drive assembly includes a third motor 41, a third horizontal shaft 42, guide rollers 43, a gear ring 410, and a fourth mounting plate 411. The arc-shaped guide plate 44 has equally spaced toothed grooves 49 on the side wall away from the pressure pipe. The four sets of guide rollers 43 are symmetrically fixedly installed at the bottom of the L-shaped support plate 45. The guide rollers 43 are rotatably connected to the side wall of the arc-shaped guide plate 44. The side wall of the L-shaped support plate 45 is fixedly connected to the third motor 41. The drive end of the third motor 41 is fixedly connected to the third horizontal shaft 42. The third horizontal shaft 42 is fixedly connected to the gear ring 410, and the gear ring 410 is meshed with the toothed grooves 49. The third horizontal shaft 42 is rotatably connected to the fourth mounting plate 411, and the fourth mounting plate 411 is fixedly installed at the bottom of the L-shaped support plate 45. The guide roller 43 of the drive component of the ring drive assembly 4 is connected to a set of arc-shaped guide plates 44 of the assembled ring support assembly for limiting connection. Then, the two sets of arc-shaped guide plates 44 are wrapped around the pressure pipe, and the support pad 46 is in close contact with the outer wall of the pressure pipe. Then, the two sets of connecting blocks 48 are connected by locking pins 412, so that the assembled ring support assembly is installed on the pressure pipe. The welding torch 1 is installed on the reciprocating moving component of the adjustable reciprocating drive assembly 3. The stepless adjustment component is started according to the welding layer width. The stepless adjustment component adjusts the unidirectional moving distance of the reciprocating moving component until the unidirectional moving distance of the reciprocating moving component matches the welding layer width. The third motor 41 drives the reciprocating moving component. The third horizontal axis 42 rotates, which drives the gear ring 410 to rotate. The gear ring 410 rotates along the tooth groove 49. Under the guidance of the four sets of guide rollers 43, it drives the L-shaped support plate 45 to rotate along the arc-shaped guide plate 44. The L-shaped support plate 45 drives the position compensation component 5 to move. The position compensation component 5 drives the housing 31 of the adjustable reciprocating drive component 3 to move. At the same time, the rotation drive component drives the stepless adjustment component to rotate. The stepless adjustment component drives the reciprocating movement component to move back and forth. The reciprocating movement component drives the welding torch 1 to move back and forth, so that the welding torch 1 rotates along the pressure pipeline and moves back and forth along the welding layer, so that the welding layer can be welded in a fish scale pattern. Please refer to the accompanying drawings in the instruction manual. Figures 1-2 , Figures 4-5 The position compensation component 5 includes a fourth motor 51, a movable block 52, a second threaded rod 53, a fifth mounting plate 54, and a guide rail assembly 55. The fourth motor 51 is fixedly mounted on the top of the L-shaped support plate 45. The top of the second threaded rod 53 is fixedly connected to the drive end of the fourth motor 51, and the bottom of the second threaded rod 53 is rotatably connected to the fifth mounting plate 54. The fifth mounting plate 54 is fixedly connected to the side wall of the L-shaped support plate 45. The movable block 52 is threadedly connected to the second threaded rod 53 through a fixedly connected threaded sleeve. The guide rail of the guide rail assembly 55 is fixedly connected to the side wall of the L-shaped support plate 45. The slider of the guide rail assembly 55 is fixedly connected to the movable block 52, and the movable block 52 is fixedly connected to the housing 31. After the first welding layer is completed, the fourth motor 51 of the position compensation component 5 drives the second threaded rod 53 to rotate. The second threaded rod 53 drives the movable block 52 to move along the guide rail component 55. The movable block 52 drives the housing 31 to move. The adjustable reciprocating drive component 3 moves a distance equal to the thickness of one welding layer away from the circumferential axis of the pressure pipe, which in turn drives the welding torch 1 to move a distance equal to the thickness of one welding layer away from the circumferential axis of the pressure pipe. The stepless adjustment component adjusts the unidirectional movement distance of the reciprocating component to meet the welding width requirements of the next welding layer, and continues welding the next welding layer. During the welding process, the distance monitoring component 2 monitors the distance from the moving part of the annular drive component 4 to the outer wall of the pressure pipe. If the distance value is less than the distance set value of the distance monitoring component 2 to the outer wall of the pressure pipe when the arc guide plate 44 of the annular drive component 4 is circular, it indicates that the distance from the arc guide plate 44 of the annular drive component 4 to the outer wall of the pressure pipe at this point is too small. When the distance to the center axis of the pipeline is less than the distance from the arc-shaped guide plate 44 of the annular drive assembly 4 to the center axis of the pressure pipeline at this point, the difference between the distance from the arc-shaped guide plate 44 of the annular drive assembly 4 to the center axis of the pressure pipeline at this point and the distance from the arc-shaped guide plate 44 of the annular drive assembly 4 to the center axis of the pressure pipeline at this point is calculated. When the welding torch 1 moves to this point, the fourth motor 51 drives the second threaded rod 53 to rotate. The second threaded rod 53 drives the movable block 52 to move along the guide rail assembly 55. The guide rail assembly 55 drives the housing 31 to move. The housing 31 drives the welding torch 1 to move away from the center axis of the pressure pipeline by the difference distance, thereby achieving dynamic compensation. When the arc-shaped guide plate 44 of the annular drive assembly 4 is not in a circular position, it can be ensured that the welding torch 1 always moves along a circular trajectory, thus ensuring the welding quality.

[0027] Please refer to the accompanying drawings in the instruction manual. Figure 1 , Figure 4 , Figures 6-8 The rotation drive assembly includes a turntable 39, a second motor 311, a second mounting plate 313, a horizontal cylinder 314, and a transmission assembly 315. The second motor 311 and the second mounting plate 313 are fixedly installed at the bottom of the housing 31. The second mounting plate 313 is rotatably connected to the horizontal cylinder 314 through a bearing. The end of the horizontal cylinder 314 away from the second motor 311 is coaxially fixedly connected to the turntable 39. The horizontal cylinder 314 and the turntable 39 are connected to a stepless adjustment assembly. The second motor 311 is connected to the horizontal cylinder 314 through the transmission assembly 315. The transmission assembly 315 includes a set of synchronous belts and two sets of synchronous pulleys. The two sets of synchronous pulleys are fixedly connected to the cross cylinder 314 and the drive end of the second motor 311, respectively, and the two sets of synchronous pulleys are connected to a set of synchronous belts. The stepless adjustment assembly includes a limit sleeve 38, a first motor 310, a first bevel gear 312, a second bevel gear 316, a second horizontal shaft 317, a sliding seat 318, a third mounting plate 319, and a first threaded rod 320. The first motor 310 is fixedly mounted on the end of the horizontal cylinder 314 near the second motor 311. The drive end of the first motor 310 is fixedly connected to the second horizontal shaft 317, and the second horizontal shaft 317 is coaxially rotatably connected to the horizontal cylinder 314 through a bearing. The end of the second horizontal shaft 317 away from the first motor 310 is connected to the first bevel gear. 312 is fixedly connected, the first bevel gear 312 is meshed with the second bevel gear 316, the bottom of the first threaded rod 320 is fixedly connected with the second bevel gear 316, the top of the first threaded rod 320 is rotatably connected with the third mounting plate 319 through the connected bearing, the sliding seat 318 is threadedly connected to the first threaded rod 320 through the threaded sleeve, and the sliding seat 318 is limited and slidably connected with two sets of limiting sleeves 38, the side wall of the turntable 39 away from the second motor 311 is fixedly connected to the limiting sleeve 38, and the reciprocating moving component is fixedly connected to the sliding seat 318.

[0028] The reciprocating moving assembly includes a drive rod 32, a slide rod 33, a mounting base 34, a square frame 35, a first horizontal shaft 36, and a ball bearing 37. The first horizontal shaft 36 is fixedly connected to the side wall of the slide base 318 away from the second motor 311. The inner ring of the ball bearing 37 is fixedly connected to the first horizontal shaft 36, and the outer ring of the ball bearing 37 is slidably connected to the inner wall of the square frame 35. The drive rod 32 is located at the end of the housing 31 and is fixedly connected to the square frame 35. The end of the drive rod 32 away from the housing 31 is fixedly connected to the mounting base 34. The end of the slide rod 33 away from the second motor 311 is fixedly connected to the mounting base 34. The welding torch 1 is fixedly mounted on the mounting base 34. Both the slide rod 33 and the drive rod 32 are slidably connected to the housing 31.

[0029] The second motor 311 of the rotation drive assembly drives the horizontal cylinder 314 to rotate along the second mounting plate 313 via the transmission assembly 315. The horizontal cylinder 314 drives the turntable 39 to rotate. The rotation of the turntable 39 drives the sliding seat 318 of the stepless adjustment assembly and the first motor 310 to rotate. The relative positions of the first bevel gear 312 and the second bevel gear 316 remain unchanged. The sliding seat 318 of the stepless adjustment assembly drives the first horizontal shaft 36 of the reciprocating motion assembly to rotate along the center of the turntable 39. The first horizontal shaft 36 drives the ball bearing 37 to rotate. The ball bearing 37 drives the square frame 35 of the reciprocating motion assembly to reciprocate. Under the action of the slide rod 33, the square frame 35 drives the drive rod 32 to reciprocate along the box 31. The drive rod 32 drives the mounting seat 34 to reciprocate. The mounting seat 34 drives the welding torch 1 to reciprocate, so that the welding torch 1 rotates along the pressure pipe and moves back and forth along the welding layer, so as to achieve fish scale welding of the welding layer. The first motor 310 of the stepless adjustment assembly drives the second horizontal shaft 317 to rotate, the second horizontal shaft 317 drives the first bevel gear 312 to rotate, the first bevel gear 312 drives the second bevel gear 316 to rotate, the second bevel gear 316 drives the first threaded rod 320 to rotate along the third mounting plate 319, the first threaded rod 320 drives the sliding seat 318 to rotate along the central axis of the first threaded rod 320, and the sliding seat 318 drives the first horizontal shaft 36 to move until the distance from the central axis of the first horizontal shaft 36 to the central axis of the turntable 39 is half the welding width of the next welding layer. The reciprocating distance of the mounting seat 34 can be adjusted according to the welding width of the welding layer, which better meets the requirements of multi-layer welding of pressure pipeline welds and is beneficial to practical use.

[0030] Please refer to the accompanying drawings in the instruction manual. Figure 1 , Figure 5 and Figure 11 The distance monitoring component 2 includes a distance sensor 21, a first mounting plate 22, and a controller 23. The distance sensor 21 and the first mounting plate 22 are fixedly mounted on the side wall of the L-shaped support plate 45. The distance sensor 21 is fixedly mounted on the bottom of the first mounting plate 22. The distance sensor 21 senses the center axis of the pressure pipe. The controller 23 is communicatively connected to the distance sensor 21, the third motor 41, the fourth motor 51, the second motor 311, and the first motor 310. During the welding process, distance sensor 21 monitors the distance from the moving part of the annular drive assembly 4 to the outer wall of the pressure pipe. If controller 23 determines that the distance is less than the set distance from the distance monitoring assembly 2 to the outer wall of the pressure pipe when the arc-shaped guide plate 44 of the annular drive assembly 4 is circular, it indicates that the distance from the arc-shaped guide plate 44 of the annular drive assembly 4 to the central axis of the pressure pipe at this point is less than the distance from the arc-shaped guide plate 44 of the annular drive assembly 4 to the central axis of the pressure pipe at this point when the arc-shaped guide plate 44 of the annular drive assembly 4 is circular. Controller 23 then calculates the distance from the arc-shaped guide plate 44 of the annular drive assembly 4 to the central axis of the pressure pipe. When the arc-shaped guide plate 44 of the ring drive assembly 4 is circular, the difference between the distance from the arc-shaped guide plate 44 of the ring drive assembly 4 at this point to the center axis of the pressure pipe and the distance from the arc-shaped guide plate 44 of the ring drive assembly 4 at this point to the center axis of the pressure pipe is calculated. When the welding torch 1 moves to this point, the controller 23 controls the fourth motor 51, and the fourth motor 51 drives the welding torch 1 to move away from the center axis of the pressure pipe by the difference distance. When the arc-shaped guide plate 44 of the ring drive assembly 4 is not circular, it can be ensured that the welding torch 1 always moves along a circular trajectory, thus ensuring the welding quality.

[0031] Example 2, please refer to the accompanying drawings in the specification. Figures 1-11 A method of using a welding device for installing pressure pipelines includes the following steps: Step 1: Install the ring drive assembly 4 onto the pressure pipeline, and install the welding torch 1 onto the reciprocating moving component of the adjustable reciprocating drive assembly 3; Step 2: Activate the stepless adjustment component according to the width of the weld layer. The stepless adjustment component adjusts the unidirectional movement distance of the reciprocating component until the unidirectional movement distance of the reciprocating component matches the width of the weld layer. Step 3: The annular drive assembly 4 drives the position compensation assembly 5 to move, which in turn drives the housing 31 of the adjustable reciprocating drive assembly 3 to move. Simultaneously, the rotation drive assembly drives the stepless adjustment assembly to rotate, which in turn drives the reciprocating motion assembly to move back and forth. The reciprocating motion assembly then drives the welding torch 1 to move back and forth. The welding torch 1 rotates along the pressure pipeline while moving back and forth along the welding layer, resulting in a fish-scale weld. Furthermore, during the welding process, the distance monitoring assembly 2 monitors the distance from the moving part of the annular drive assembly 4 to the outer wall of the pressure pipeline. If the distance is less than the distance of the circular support part of the annular drive assembly 4, the distance monitoring assembly 2 will move to the outer wall of the pressure pipeline. The distance setting value of the outer wall of the pressure pipeline indicates that the distance from the support part of the annular drive component 4 at this point to the central axis of the pressure pipeline is less than the distance from the support part of the annular drive component 4 at this point to the central axis of the pressure pipeline when the support part of the annular drive component 4 is circular. The difference between the distance from the support part of the annular drive component 4 at this point to the central axis of the pressure pipeline when the support part of the annular drive component 4 is circular and the distance from the support part of the annular drive component 4 at this point to the central axis of the pressure pipeline is calculated. When the welding torch 1 moves to this point, the position compensation component 5 drives the welding torch 1 to move away from the central axis of the pressure pipeline by the difference distance. Step 4: After the welding of one layer is completed, the position compensation component 5 is adjusted and the reciprocating drive component 3 is moved away from the circumferential axis of the pressure pipeline by a distance equal to the thickness of one welding layer. Step 5: Repeat steps 2-4 until all weld layers are completed.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding apparatus for installing pressure pipelines, comprising a welding torch (1) and an annular drive assembly (4), characterized in that: The annular drive assembly (4) for driving the welding torch (1) to move circumferentially along the pressure pipe is connected to a position compensation assembly (5) for radial position compensation. The position compensation component (5) is connected to an adjustable reciprocating drive component (3) for reciprocating drive and stepless adjustment of reciprocating distance. The adjustable reciprocating drive assembly (3) includes a housing (31), a rotary drive assembly, a stepless adjustment assembly, and a reciprocating motion assembly. The housing (31) is fixedly connected to the drive end of the position compensation assembly (5). The rotary drive assembly is fixedly connected to the housing (31). The rotary drive assembly is connected to the stepless adjustment assembly. The stepless adjustment assembly is connected to the reciprocating motion assembly. The reciprocating motion assembly is in close contact with the housing (31) and is slidably connected. The welding torch (1) is fixedly installed at the end of the reciprocating motion assembly away from the housing (31).

2. The welding apparatus for pressure pipeline installation according to claim 1, characterized in that, The ring drive assembly (4) includes an assembled ring support assembly, a drive assembly and an L-shaped support plate (45). The assembled ring support assembly is in close contact with the pressure pipeline. The assembled ring support assembly is connected to the drive assembly. The drive assembly is connected to the L-shaped support plate (45). The position compensation assembly (5) is connected to the L-shaped support plate (45).

3. The welding apparatus for pressure pipeline installation according to claim 2, characterized in that, The assembled ring support assembly includes two sets of arc-shaped guide plates (44), multiple sets of support pads (46), a set of hinges (47), two sets of connecting blocks (48), and a set of locking pins (412). The two sets of arc-shaped guide plates (44) are rotatably connected at one end near the inner wall of the pressure pipe through the hinges (47). The other end of the two sets of arc-shaped guide plates (44) is fixedly connected to the two sets of connecting blocks (48) one by one. The two sets of connecting blocks (48) are fixedly connected through the locking pins (412). The multiple sets of support pads (46) are divided into two parts, and the support pads (46) in each part are fixedly installed at equal intervals on the arc-shaped guide plates (44) near the inner wall of the pressure pipe. The arc-shaped guide plates (44) are connected to the drive assembly.

4. The welding apparatus for pressure pipeline installation according to claim 3, characterized in that, The drive assembly includes a third motor (41), a third horizontal shaft (42), guide rollers (43), a gear ring (410), and a fourth mounting plate (411). The arc-shaped guide plate (44) has toothed grooves (49) at equal intervals away from the side wall of the pressure pipe. The four sets of guide rollers (43) are symmetrically fixedly installed at the bottom of the L-shaped support plate (45). The guide rollers (43) are rotatably connected to the side wall of the arc-shaped guide plate (44). The side wall of the L-shaped support plate (45) is fixedly connected to the third motor (41). The drive end of the third motor (41) is fixedly connected to the third horizontal shaft (42). The third horizontal shaft (42) is fixedly connected to the gear ring (410), and the gear ring (410) is meshed with the toothed grooves (49). The third horizontal shaft (42) is rotatably connected to the fourth mounting plate (411), and the fourth mounting plate (411) is fixedly installed at the bottom of the L-shaped support plate (45).

5. The welding apparatus for pressure pipeline installation according to claim 2, characterized in that, The position compensation component (5) includes a fourth motor (51), a movable block (52), a second threaded rod (53), a fifth mounting plate (54), and a guide rail assembly (55). The fourth motor (51) is fixedly installed on the top of the L-shaped support plate (45). The top of the second threaded rod (53) is fixedly connected to the drive end of the fourth motor (51). The bottom of the second threaded rod (53) is rotatably connected to the fifth mounting plate (54). The fifth mounting plate (54) is fixedly connected to the side wall of the L-shaped support plate (45). The movable block (52) is threadedly connected to the second threaded rod (53) through a fixedly connected threaded sleeve. The guide rail of the guide rail assembly (55) is fixedly connected to the side wall of the L-shaped support plate (45). The slider of the guide rail assembly (55) is fixedly connected to the movable block (52), and the movable block (52) is fixedly connected to the housing (31).

6. The welding apparatus for installing pressure pipelines according to any one of claims 1-5, characterized in that, The rotation drive assembly includes a turntable (39), a second motor (311), a second mounting plate (313), a cross cylinder (314), and a transmission assembly (315). The second motor (311) and the second mounting plate (313) are fixedly installed at the bottom of the housing (31). The second mounting plate (313) is rotatably connected to the cross cylinder (314) through a bearing. The end of the cross cylinder (314) away from the second motor (311) is coaxially fixedly connected to the turntable (39). The cross cylinder (314) and the turntable (39) are connected to the stepless adjustment assembly. The second motor (311) is connected to the cross cylinder (314) through the transmission assembly (315).

7. The welding apparatus for pressure pipeline installation according to claim 6, characterized in that, The stepless adjustment assembly includes a limiting sleeve (38), a first motor (310), a first bevel gear (312), a second bevel gear (316), a second horizontal shaft (317), a sliding seat (318), a third mounting plate (319), and a first threaded rod (320). The first motor (310) is fixedly mounted on the end of the horizontal cylinder (314) near the second motor (311). The driving end of the first motor (310) is fixedly connected to the second horizontal shaft (317), and the second horizontal shaft (317) is coaxially rotatably connected to the horizontal cylinder (314) through a bearing. The end of the second horizontal shaft (317) away from the first motor (310) is connected to the first bevel gear (316). Gear (312) is fixedly connected, first bevel gear (312) meshes with second bevel gear (316), bottom of first threaded rod (320) is fixedly connected with second bevel gear (316), top of first threaded rod (320) is rotatably connected with third mounting plate (319) through connected bearing, sliding seat (318) is threadedly connected to first threaded rod (320) through threaded sleeve, and sliding seat (318) is limited and slidably connected with two sets of limit sleeves (38), turntable (39) is fixedly connected to the side wall away from second motor (311) and limit sleeve (38), reciprocating moving component is fixedly connected to sliding seat (318).

8. The welding apparatus for pressure pipeline installation according to claim 7, characterized in that, The reciprocating moving assembly includes a drive rod (32), a slide rod (33), a mounting base (34), a square frame (35), a first horizontal shaft (36), and a ball bearing (37). The first horizontal shaft (36) is fixedly connected to the side wall of the slide base (318) away from the second motor (311). The inner ring of the ball bearing (37) is fixedly connected to the first horizontal shaft (36), and the outer ring of the ball bearing (37) is slidably connected to the inner wall of the square frame (35). The drive rod (32) is fixedly connected to the square frame (35) at the end of the housing (31). The end of the drive rod (32) away from the housing (31) is fixedly connected to the mounting base (34). The end of the slide rod (33) away from the second motor (311) is fixedly connected to the mounting base (34). The welding torch (1) is fixedly installed on the mounting base (34). Both the slide rod (33) and the drive rod (32) are slidably connected to the housing (31).

9. The welding apparatus for installing pressure pipelines according to claim 1, characterized in that, The moving part of the ring drive assembly (4) is connected to a distance monitoring component (2) for distance monitoring component (2) to the outer wall of the pressure pipe, and the distance monitoring component (2) senses the center axis of the pressure pipe.

10. A method of using a welding apparatus for installing pressure pipelines according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Install the ring drive assembly (4) on the pressure pipeline and install the welding torch (1) on the reciprocating moving component of the adjustable reciprocating drive assembly (3); Step 2: Activate the stepless adjustment component according to the width of the weld layer. The stepless adjustment component adjusts the unidirectional movement distance of the reciprocating component until the unidirectional movement distance of the reciprocating component matches the width of the weld layer. Step 3: The ring drive assembly (4) drives the position compensation assembly (5) to move, the position compensation assembly (5) drives the housing (31) of the adjustable reciprocating drive assembly (3) to move, at the same time, the rotation drive assembly drives the stepless adjustment assembly to rotate, the stepless adjustment assembly drives the reciprocating motion assembly to move back and forth, the reciprocating motion assembly drives the welding torch (1) to move back and forth, the welding torch (1) rotates along the pressure pipeline and moves back and forth along the welding layer, and the welding layer is welded in a fish scale pattern; Step 4: After the welding of one layer is completed, the position compensation component (5) adjusts the reciprocating drive component (3) to move a distance equal to the thickness of one welding layer away from the circumferential axis of the pressure pipeline; Step 5: Repeat steps 2-4 until all weld layers are completed.

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