Laser welding device and method for pipeline in vertical shaft

Abstract

The invention discloses a laser welding device and method for pipelines in a vertical shaft, and particularly relates to the technical field of pipeline welding, the laser welding device comprises two supporting blocks, the tops of the two supporting blocks are fixedly provided with the same top plate, the top of the top plate is provided with a moving groove, and a threaded rod is rotationally connected between the inner walls of the two ends of the moving groove; and a moving block in threaded connection with the threaded rod is arranged on the threaded rod, the moving block is slidably connected with the inner walls of the two sides of the moving groove, and an adjusting motor is fixedly installed on the outer wall of one side of the top plate. By arranging the hoisting and releasing mechanism, the automatic grabbing and releasing functions of a pipeline are achieved, when a hydraulic cylinder drives a hoisting barrel to move downwards, the curved surface of an upper fixing block makes contact with the trapezoidal inclined face of a clamping block, the clamping block is triggered to compress a first spring and then reset, automatic locking of the upper fixing block is completed, and after welding is completed, automatic releasing is achieved through secondary downward pressing; the problems of pipeline hoisting and quick release in a narrow space in a vertical shaft are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline welding, and particularly to a laser welding device and method for pipelines in a shaft. Background Art

[0002] In the fields of municipal engineering, water conservancy facilities and nuclear energy construction, pipeline welding in a shaft, as a typical high-altitude confined space operation, puts forward special requirements for the integration and intelligence of construction equipment. In such projects, the pipeline system mostly adopts the segmented hoisting and welding process. The vertical depth of the operation surface often reaches more than 100 meters, and due to the limitation of the shaft wall structure, the operating space is usually less than 30% of the conventional ground operation.

[0003] Currently, before welding pipelines in a shaft, the pipelines need to be hoisted. At present, most mechanical clamping devices adopt a rigid locking structure, and manual intervention is required to unlock the mechanism when the pipe body is released. Moreover, during the hoisting process, the non-linear swing of the pipe body caused by the gravity is difficult to eliminate, which is likely to affect the subsequent welding quality and is inconvenient to use. Therefore, we propose a laser welding device and method for pipelines in a shaft. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art and propose a laser welding device and method for pipelines in a shaft.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: A laser welding device for pipelines in a shaft includes two support blocks. The top of the two support blocks is fixedly provided with the same top plate. A moving groove is opened at the top of the top plate. A threaded rod is rotatably connected between the inner walls of the two ends of the moving groove. A moving block is arranged on the threaded rod and is in threaded connection with the threaded rod. The moving block is slidably connected to the inner walls of both sides of the moving groove. An adjustment motor is fixedly installed on the outer wall of one side of the top plate. One end of the threaded rod penetrates through the inner wall of one end of the moving groove and is fixedly connected to the output shaft of the adjustment motor. Two hydraulic cylinders are fixedly installed at the bottom of the moving block. Connecting plates are fixedly installed on the telescopic ends of the two hydraulic cylinders. A water storage box is fixedly installed between the two connecting plates. A central block is arranged directly below the water storage box. Four auxiliary alignment mechanisms are arranged on the central block. A hoisting release mechanism is arranged below the central block. Four seal detection mechanisms are arranged on the water storage box.

[0006] Preferably, the auxiliary alignment mechanism includes side blocks fixedly installed outside the central block. A displacement groove is formed at the top of the side block. A displacement rod passing through the displacement groove and slidingly connected to its inner wall is provided. A first telescopic rod is fixedly installed on the inner wall at one end of the displacement groove. The telescopic end of the first telescopic rod is fixedly connected to the displacement rod. One end of two connecting rods is rotatably connected to the top of the displacement rod, and the other ends of the two connecting rods are both rotatably connected to the water storage box. A alignment abutting block is fixedly installed on the side wall of the displacement rod close to the central block.

[0007] Preferably, the hoisting and releasing mechanism includes a hoisting cylinder fixedly installed at the bottom of the central block. Four inner grooves are formed on the inner wall of the hoisting cylinder. Second telescopic rods are fixedly installed on the inner side walls at the inner ends of the four inner grooves. Four clamping blocks are fixedly installed on the telescopic ends of the four second telescopic rods. The four clamping blocks are respectively slidingly connected to the inner walls of the four inner grooves. First springs are respectively fixedly connected between the four clamping blocks and the inner side walls at the inner ends of the four inner grooves where they are located. A upper fixing block is arranged below the central block. A guiding column is arranged at the bottom of the upper fixing block. A sliding block is slidably sleeved on the guiding column. A bottom block is fixedly installed at the bottom of the guiding column. A hoisting pipe body is arranged below the bottom block. A first flange is arranged on the bottom block. A second flange is arranged on the hoisting pipe body. Multiple groups of connecting bolts are arranged on the first flange.

[0008] Preferably, the sealing detection mechanism includes a detection cylinder fixedly installed at the bottom of the water storage box. A transmission rod passing through the bottom of the detection cylinder and slidingly connected to it is provided. One end of the transmission rod is fixedly connected to the top of the central block. A piston slidingly connected to the inner wall of the detection cylinder is fixedly installed at the other end of the transmission rod. A second spring is fixedly connected between the piston and the inner bottom of the detection cylinder. An inhalation pipe and a detection pipe communicating with its interior are arranged on the detection cylinder.

[0009] Preferably, the upper fixing block and the sliding block are both adapted to the hoisting cylinder. The vertical cross-sections of the four clamping blocks are all right trapezoids. The outer side walls of the upper fixing block and the sliding block are both curved surfaces.

[0010] Preferably, the ends of the inhalation pipe and the detection pipe communicating with the detection cylinder are both located above the piston. Check valves are arranged in both the inhalation pipe and the detection pipe.

[0011] Preferably, the end of the inhalation pipe far from the detection cylinder is communicated with the water storage box. The end of the detection pipe far from the detection cylinder penetrates through the displacement rod.

[0012] The present invention also discloses a method for laser welding pipes in a shaft, including the following steps: In the first step, the hoisting pipe body is connected and fixed to the bottom block through the connecting bolts. After the connection is completed, the hoisting pipe body is located directly below the hoisting cylinder. In the second step, the hoisting pipe body is hoisted into the shaft and docked with another pipe body by adjusting the motor, hydraulic cylinder and hoisting release mechanism. When hoisting the hoisting pipe body, the auxiliary alignment mechanism is used to make the alignment abutting block abut against the outer wall of the hoisting pipe body to align it, improving the docking accuracy. In the third step, laser welding is performed on the docking part of the hoisting pipe body and another pipe body in the shaft. After welding, the welded part is subjected to water spray testing for its welding tightness by the sealing detection mechanism. The hoisting pipe body is separated from the hoisting cylinder by the hydraulic cylinder and hoisting release mechanism, and the hoisting pipe body is separated and removed from the bottom block by the connecting bolts.

[0013] Advantages of the present invention: By setting the hoisting release mechanism, the automatic grasping and releasing function of the pipeline is realized. When the hydraulic cylinder drives the hoisting cylinder to move down, the curved surface of the upper fixing block contacts the trapezoidal inclined surface of the block, triggering the block to compress the first spring and then reset, completing the automatic locking of the upper fixing block. After welding, automatic release is achieved by pressing down twice, solving the problems of hoisting and rapid release of pipelines in the narrow space of the shaft.

[0014] By setting the auxiliary swing mechanism, the center block can be driven to move down by the self-weight of the hoisting pipe body. Through the transmission of the connecting rod, the four displacement rods are driven to synchronously contract towards the center, forming an annular clamping structure with the alignment abutting blocks, restricting the outer wall of the pipeline on the vertical axis, effectively solving the problems of easy swing of the pipe body and large welding difficulty during the hoisting process in the deep shaft.

[0015] By setting the sealing detection mechanism, when the hoisting pipe body moves down by its own weight during hoisting, the piston is pulled down, sucking the water in the water storage box into the detection cylinder for temporary storage. When the hydraulic cylinder contracts and the center block returns to its original position after welding, the second spring pushes the piston up, spraying the water through the detection pipe onto the weld to complete the tightness detection.

[0016] The present invention can realize the grasping and secondary pressing release of the hoisting pipe body. By using the self-weight of the hoisting pipe body, the auxiliary swing mechanism drives the connecting rods to contract synchronously, forming an annular vertical constraint, effectively reducing the influence of hoisting swing on the welding accuracy. By setting the sealing detection mechanism, after welding, the welded part can be automatically subjected to water spray testing for its tightness, with a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a three-dimensional structural schematic diagram of one side of a pipeline laser welding device in a shaft proposed by the present invention; Figure 2 FIG. is a three-dimensional structural schematic diagram of the other side of a pipeline laser welding device in a shaft proposed by the present invention; Figure 3 FIG. is a three-dimensional structural schematic diagram of the present invention after being cut along a symmetry line of the center block; Figure 4 The present invention is attached Figure 3 Schematic diagram of the three-dimensional structure at A in the middle; Figure 5 The present invention is attached Figure 3 Schematic diagram of the structure at B in the middle; Figure 6 The present invention is attached Figure 3 Schematic diagram of the structure at point C in the middle.

[0018] In the figure: 1 top plate, 2 threaded rod, 3 moving block, 4 moving groove, 5 adjustment motor, 6 support block, 7 hydraulic cylinder, 8 water storage box, 9 connecting plate, 10 side block, 11 detection cylinder, 12 detection tube, 13 connecting rod, 14 displacement groove, 15 first telescopic rod, 16 displacement rod, 17 center block, 18 lifting cylinder, 19 straightening block, 20 upper fixed block, 21 sliding block, 22 bottom block, 23 first flange, 24 guide column, 25 inner groove, 26 second telescopic rod, 27 first spring, 28 clamping block, 29 second flange, 30 connecting bolt, 31 lifting pipe body, 32 second spring, 33 suction pipe, 34 piston, 35 transmission rod. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Reference Figures 1-6, a laser welding device for pipes in a vertical shaft, comprising two support blocks 6, the two support blocks 6 are respectively fixedly mounted on both sides of the vertical shaft, the top of the two support blocks 6 is fixedly mounted with the same top plate 1, the top of the top plate 1 is provided with a moving groove 4, which serves as a guide rail for the threaded transmission system, and a threaded rod 2 is rotatably connected between the inner walls at both ends of the moving groove 4, and a moving block 3 threadedly connected thereto is provided on the threaded rod 2, and the moving block 3 is slidably connected to the inner walls on both sides of the moving groove 4, and an adjustment motor 5 is fixedly mounted on the outer wall of one side of the top plate 1, one end of the threaded rod 2 passes through the inner wall of one end of the moving groove 4 and is fixedly connected to the output shaft of the adjustment motor 5, and two hydraulic cylinders 7 are fixedly mounted on the bottom of the moving block 3 as a lifting drive mechanism to control the vertical movement of the water storage box 8, and a connecting rod 7 is fixedly mounted on the telescopic end of the two hydraulic cylinders 7 A connecting plate 9, a water storage box 8 is fixedly installed between the two connecting plates 9, a center block 17 is provided just below the water storage box 8, and four auxiliary straightening mechanisms are provided on the center block 17 for automatically correcting the pipe docking angle to ensure welding quality. The auxiliary straightening mechanism includes a side block 10 fixedly installed on the outside of the center block 17, a displacement groove 14 is provided on the top of the side block 10, a displacement groove 14 is provided, and a displacement rod 16 is provided in the displacement groove 14 and is slidably connected to its inner wall. A first telescopic rod 15 is fixedly installed on the inner wall of one end of the displacement groove 14, and the telescopic end of the first telescopic rod 15 is fixedly connected to the displacement rod 16, and the top of the displacement rod 16 is rotatably connected to one end of the two connecting rods 13, and the other ends of the two connecting rods 13 are rotatably connected to the water storage box 8, and a straightening block 19 is fixedly installed on the side wall of the displacement rod 16 close to the center block 17.

[0021] A lifting and releasing mechanism is provided below the center block 17 for realizing the grabbing and lifting and subsequent release and separation of the lifting tube body 31. The lifting and releasing mechanism comprises a lifting cylinder 18 fixedly mounted on the bottom of the center block 17. Four inner grooves 25 are provided on the inner wall of the lifting cylinder 18. The inner end side walls of the four inner grooves 25 are fixedly mounted with second telescopic rods 26. Four clamping blocks 28 are fixedly mounted on the telescopic ends of the four second telescopic rods 26. The four clamping blocks 28 are respectively slidably connected to the inner walls of the four inner grooves 25. A first spring 27 is fixedly connected between the four clamping blocks 28 and the inner end side walls of the four inner grooves 25. An upper fixed block 20 is provided below the core block 17, a guide column 24 is provided at the bottom of the upper fixed block 20, a sliding block 21 is slidably sleeved on the guide column 24, a bottom block 22 is fixedly installed at the bottom of the guide column 24, a hanging tube body 31 is provided below the bottom block 22, a first flange 23 is provided on the bottom block 22, a second flange 29 is provided on the hanging tube body 31, and multiple groups of connecting bolts 30 are provided on the first flange 23. The upper fixed block 20 and the sliding block 21 are both compatible with the hanging tube 18. The vertical sections of the four clamping blocks 28 are all right-angled trapezoidal shapes, and the outer side walls of the upper fixed block 20 and the sliding block 21 are both curved surfaces.

[0022] There are four seal detection mechanisms arranged on the water storage box 8, which are used to spray water on the welded joints to detect their sealing performance, making it more convenient to use. The seal detection mechanism includes a detection cylinder 11 fixedly installed on the bottom of the water storage box 8. A transmission rod 35 is arranged through the bottom of the detection cylinder 11 and is slidably connected to it. One end of the transmission rod 35 is fixedly connected to the top of the central block 17, and the other end of the transmission rod 35 is fixedly installed with a piston 34 that is slidably connected to the inner wall of the detection cylinder 11. A second spring 32 is fixedly connected between the piston 34 and the inner bottom of the detection cylinder 11 to achieve the automatic reset of the piston 34. The detection cylinder 11 is provided with a suction pipe 33 and a detection pipe 12 that are connected to its interior. The ends of the suction pipe 33 and the detection pipe 12 connected to the detection cylinder 11 are both located above the piston 34. One-way valves are provided in both the suction pipe 33 and the detection pipe 12 to control the one-way flow of water. The end of the suction pipe 33 away from the detection cylinder 11 is connected to the water storage box 8, and the end of the detection pipe 12 away from the detection cylinder 11 penetrates through the displacement rod 16.

[0023] A method for laser welding pipes in a shaft includes the following steps: In the first step, the hoisting pipe body 31 is connected and fixed to the bottom block 22 through the connecting bolts 30. After the connection is completed, the hoisting pipe body 31 is located directly below the hoisting cylinder 18. In the second step, the hoisting pipe body 31 is hoisted into the shaft and docked with another pipe body by adjusting the motor 5, the hydraulic cylinder 7, and the hoisting release mechanism. When the hoisting pipe body 31 is lifted, through the auxiliary alignment mechanism, the alignment abutting block 19 abuts against the outer wall of the hoisting pipe body 31 to align it, improving the docking accuracy. In the third step, laser welding is performed on the docking joint of the hoisting pipe body 31 and another pipe body in the shaft. After the welding is completed, through the seal detection mechanism, water is sprayed on the welded joint to detect its welding sealing performance. The hoisting pipe body 31 is disengaged from the hoisting cylinder 18 through the hydraulic cylinder 7 and the hoisting release mechanism, and the hoisting pipe body 31 is separated and removed from the bottom block 22 through the connecting bolts 30.

[0024] When the present invention is in use, the first flange 23 on the bottom block 22 and the second flange 29 on the hoisting pipe body 31 of a certain size are connected and fixed by the connecting bolt 30, and the hoisting pipe body 31 is located directly below the hoisting cylinder 18. Subsequently, the water storage box 8, the central block 17 and the hoisting cylinder 18 are moved downward by a certain distance through the hydraulic cylinder 7, so that the upper fixing block 20 enters the hoisting cylinder 18. The curved surface of the upper fixing block 20 will come into contact with the inclined surfaces of the four clamping blocks 28. As the hoisting cylinder 18 continues to move downward and by setting the second telescopic rod 26, the upper fixing block 20 can move from below the four clamping blocks 28 to above the four clamping blocks 28. And by setting the first spring 27, the four clamping blocks 28 can be reset to limit the upper fixing block 20 (at this time, the clamping block 28 is located between the upper fixing block 20 and the sliding block 21). Subsequently, the water storage box 8, the central block 17 and the hoisting cylinder 18 are moved upward by the hydraulic cylinder 7. Since the upper fixing block 20 is limited by the four clamping blocks 28, the upper fixing block 20 and the hoisting pipe body 31 below it can be lifted accordingly; When the hoisting pipe body 31 is lifted, the self-weight of the hoisting pipe body 31 will cause the central block 17 to move away from the water storage box 8. By setting the transmission rod 35, the piston 34 can slide downward in the detection cylinder 11, thereby generating a suction effect, so that the water in the water storage box 8 is sucked into the detection cylinder 11 through the suction pipe 33, and the second spring 32 is compressed. When the central block 17 moves away from the water storage box 8, by setting the connecting rod 13 and the first telescopic rod 15, the four displacement rods 16 can be made to approach each other, and then the four alignment abutting blocks 19 can be made to approach each other. The four mutually approaching alignment abutting blocks 19 will finally abut against the outer wall of the hoisting pipe body 31, making it not easy to shake. By adjusting the motor 5, the threaded rod 2 can be rotated, and then the moving block 3 can move left and right. Finally, the left and right movement of the hoisting pipe body 31 is realized. After the hoisting pipe body 31 is moved directly above the shaft, the hoisting pipe body 31 is moved downward into the shaft by the hydraulic cylinder 7 to be docked with another pipe body in the shaft. After the docking is completed, laser welding is performed on the docking part of the hoisting pipe body 31 and the other pipe body; After laser welding is completed, the water storage box 8 is moved downward by the hydraulic cylinder 7. During this process, the self-weight of the hoisting pipe body 31 no longer acts on the hoisting cylinder 18 and the central block 17. By setting the second spring 32, the central block 17 can gradually approach the water storage box 8 and finally return to the initial position. By setting the connecting rod 13, the four displacement rods 16 can be made to move away from each other. At the same time, by setting the transmission rod 35 and the piston 34, the piston 34 can slide upward in the detection cylinder 11, thereby generating a squeezing effect, so that the water in the detection cylinder 11 is sprayed through the detection pipe 12 to the welding joint between the hoisting pipe body 31 and another pipe body, and then the sealing performance after welding can be detected. When the water storage box 8 and the central block 17 return to the initial position, the water storage box 8, the central block 17 and the hoisting cylinder 18 are moved downward by the hydraulic cylinder 7 for a certain distance, so that the tops of the four clamping blocks 28 contact the sliding block 21. By setting the second telescopic rod 26, the four clamping blocks 28 can move to the lower side of the sliding block 21 and the outer curved surfaces of the four clamping blocks 28 are abutted against the sliding block 21 by setting the first spring 27. At this time, the water storage box 8, the central block 17 and the hoisting cylinder 18 are moved upward by the hydraulic cylinder 7. Through the first spring 27 and the four clamping blocks 28, the sliding block 21 can slide upward on the guide post 24. When the sliding block 21 slides upward to abut against the upper fixing block 20, as the hoisting cylinder 18 continues to move upward, the four clamping blocks 28 will move from the curved surface of the sliding block 21 and the curved surface of the upper fixing block 20 to the upper side of the upper fixing block 20, and the sliding block 21 will then slide down to the initial position on the guide post 24 due to its own weight. In this way, the automatic separation of the hoisting pipe body 31 and the hoisting cylinder 18 can be realized. Finally, the first flange 23 and the second flange 29 are disassembled by the connecting bolt 30.

[0025] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A laser welding device for a pipeline in a vertical shaft, comprising two support blocks (6), characterized in that: The tops of the two support blocks (6) are fixedly mounted with a top plate (1), a movable groove (4) is provided on the top of the top plate (1), a threaded rod (2) is rotatably connected between the inner walls at both ends of the movable groove (4), a movable block (3) is provided on the threaded rod (2) and is threadedly connected thereto, the movable block (3) is slidably connected to the inner walls on both sides of the movable groove (4), an adjustment motor (5) is fixedly mounted on the outer wall of one side of the top plate (1), one end of the threaded rod (2) passes through the inner wall of one end of the movable groove (4) and is in contact with the adjustment motor (5). The output shaft of the whole motor (5) is fixedly connected, two hydraulic cylinders (7) are fixedly installed on the bottom of the moving block (3), connecting plates (9) are fixedly installed on the telescopic ends of the two hydraulic cylinders (7), a water storage box (8) is fixedly installed between the two connecting plates (9), a center block (17) is arranged directly below the water storage box (8), four auxiliary straightening mechanisms are arranged on the center block (17), a lifting release mechanism is arranged below the center block (17), and four sealing detection mechanisms are arranged on the water storage box (8).

2. A laser welding device for pipelines in a shaft according to claim 1, characterized in that: The auxiliary straightening mechanism comprises a side block (10) fixedly mounted on the outside of a central block (17); a displacement groove (14) is provided on the top of the side block (10); a displacement rod (16) is provided in the displacement groove (14) and is slidably connected to the inner wall thereof; a first telescopic rod (15) is fixedly mounted on the inner wall of one end of the displacement groove (14); the telescopic end of the first telescopic rod (15) is fixedly connected to the displacement rod (16); the top of the displacement rod (16) is rotatably connected to one end of two connecting rods (13); the other ends of the two connecting rods (13) are rotatably connected to the water storage box (8); and a straightening block (19) is fixedly mounted on a side wall of the displacement rod (16) close to the central block (17).

3. The laser welding device for pipelines in a shaft according to claim 2, characterized in that: The hoisting release mechanism comprises a hoisting cylinder (18) fixedly mounted on the bottom of the center block (17), four inner grooves (25) are provided on the inner wall of the hoisting cylinder (18), the inner end side walls of the four inner grooves (25) are fixedly mounted with second telescopic rods (26), the telescopic ends of the four second telescopic rods (26) are fixedly mounted with four clamping blocks (28), the four clamping blocks (28) are respectively slidably connected to the inner walls of the four inner grooves (25), and the four clamping blocks (28) are respectively fixedly connected to the inner end side walls of the four inner grooves (25). 27), an upper fixed block (20) is provided below the center block (17), a guide column (24) is provided at the bottom of the upper fixed block (20), a sliding block (21) is slidably sleeved on the guide column (24), a bottom block (22) is fixedly installed at the bottom of the guide column (24), a hanging tube body (31) is provided below the bottom block (22), a first flange (23) is provided on the bottom block (22), a second flange (29) is provided on the hanging tube body (31), and a plurality of connecting bolts (30) are provided on the first flange (23).

4. The laser welding device for pipelines in a shaft according to claim 3, characterized in that: The sealing detection mechanism comprises a detection cylinder (11) fixedly mounted on the bottom of the water storage box (8); a transmission rod (35) is provided through the bottom of the detection cylinder (11) and is slidably connected thereto; one end of the transmission rod (35) is fixedly connected to the top of the center block (17); a piston (34) is fixedly mounted on the other end of the transmission rod (35) and is slidably connected to the inner wall of the detection cylinder (11); a second spring (32) is fixedly connected between the piston (34) and the inner bottom of the detection cylinder (11); and a suction pipe (33) and a detection pipe (12) are provided on the detection cylinder (11) and are communicated with the interior thereof.

5. The laser welding device for pipelines in a vertical shaft according to claim 3, characterized in that: The upper fixed block (20) and the sliding block (21) are both compatible with the hoisting tube (18), the vertical cross-sections of the four clamping blocks (28) are all right-angled trapezoidal shapes, and the outer side walls of the upper fixed block (20) and the sliding block (21) are all curved surfaces.

6. The laser welding device for pipelines in a shaft according to claim 4, characterized in that: One end of the suction pipe (33) and the detection pipe (12) connected to the detection cylinder (11) is located above the piston (34), and a one-way valve is provided in each of the suction pipe (33) and the detection pipe (12).

7. The laser welding device for pipelines in a vertical shaft according to claim 4, characterized in that: One end of the suction tube (33) away from the detection cylinder (11) is connected to the water storage box (8), and one end of the detection tube (12) away from the detection cylinder (11) passes through the displacement rod (16).

8. A welding method according to the laser welding device for pipelines in a shaft according to any one of claims 1 to 7, characterized in that: The following steps are involved: The first step is to connect and fix the hanging tube body (31) to the bottom block (22) by connecting bolts (30). After the connection is completed, the hanging tube body (31) is located directly below the hanging tube (18); In the second step, the hoisting pipe body (31) is hoisted into the vertical shaft and docked with another pipe body by adjusting the motor (5), the hydraulic cylinder (7) and the hoisting release mechanism. When the hoisting pipe body (31) is hoisted, the auxiliary straightening mechanism is used to make the straightening block (19) abut against the outer wall of the hoisting pipe body (31) to straighten it, thereby improving the docking accuracy. In the third step, laser welding is performed on the joint between the lifting pipe body (31) and the other pipe body in the shaft. After the welding is completed, water is sprayed on the weld to detect the welding sealing through the sealing detection mechanism. The lifting pipe body (31) is separated from the lifting cylinder (18) through the hydraulic cylinder (7) and the lifting release mechanism, and the lifting pipe body (31) is separated from the bottom block (22) by the connecting bolts (30).

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