A laser welding device and method for pipes in a shaft

Abstract

The application discloses a kind of vertical shaft inner pipeline laser welding device and method, specifically relates to pipeline welding technical field, including two support blocks, the top of two The same top plate is fixedly installed in support block, the top of the top plate is equipped with moving slot, the both ends inner wall between moving slot is rotatably connected with threaded rod, the threaded rod is provided with the moving block that is screw connected with it, the moving block is slidably connected with the both sides inner wall of moving slot, the outside wall of the one side of the top plate is fixedly installed with adjusting motor.The application is provided with lifting release mechanism, realizes the automatic grabbing and releasing function of pipeline, when hydraulic cylinder drives lifting cylinder to move down, the curved surface of upper fixed block is contacted with the trapezoidal inclined surface of clamping block, triggers clamping block to compress first spring and resets, completes the automatic locking of upper fixed block, after welding, realizes automatic release by secondary pressing, solve the problem of narrow space pipeline hoisting and quick release in vertical shaft.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline welding, in particular to a laser welding device and method for a pipeline in a vertical shaft. BACKGROUND

[0002] In the field of municipal engineering, water conservancy facilities and nuclear energy construction, pipeline welding in a vertical shaft as a typical high-altitude confined space operation puts special requirements on the integration and intelligentization of construction equipment. In such projects, the pipeline system is often welded by sectional hoisting, and the vertical and longitudinal depth of the operation surface often reaches more than 100 meters. Due to the limitation of the shaft wall structure, the operation space is usually less than 30% of the conventional ground operation.

[0003] Currently, the pipeline needs to be hoisted before welding in the vertical shaft. The mechanical clamping device currently uses a rigid locking structure. When the pipe body is released, manual intervention is required to unlock the mechanism. In the hoisting process, the nonlinear swing of the pipe body caused by gravity is difficult to eliminate, which may affect the subsequent welding quality and is inconvenient to use. Therefore, we propose a laser welding device and method for a pipeline in a vertical shaft. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art and to provide a laser welding device and method for a pipeline in a vertical shaft.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] A laser welding device for a pipeline in a vertical shaft, comprising two support blocks, a top plate is fixedly installed on the top of the two support blocks, a moving groove is formed in 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 threadedly connected to the threaded rod, the moving block is slidably connected to the inner walls of the two sides of the moving groove, an adjusting 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 with the output shaft of the adjusting motor, two hydraulic cylinders are fixedly installed on the bottom of the moving block, a connecting plate is fixedly installed on the extension end of each hydraulic cylinder, a water storage box is fixedly installed between the two connecting plates, a center block is arranged below the water storage box, four auxiliary alignment mechanisms are arranged on the center block, a hoisting release mechanism is arranged below the center block, and four sealing detection mechanisms are arranged on the water storage box.

[0007] Preferably, the auxiliary alignment mechanism comprises a side block fixedly installed outside the center block, the top of the side block is provided with a displacement slot, a displacement rod is arranged through the displacement slot and is in sliding connection with the inner wall of the displacement slot, a first telescopic rod is fixedly installed on the inner wall of one end of the displacement slot, the telescopic end of the first telescopic rod is fixedly connected to the displacement rod, the top of the displacement rod is rotatably connected to one end of two connecting rods, the other ends of the two connecting rods are rotatably connected to the water storage box, and a alignment block is fixedly installed on the side wall of the displacement rod close to the center block.

[0008] Preferably, the lifting release mechanism comprises a lifting cylinder fixedly installed on the bottom of the center block, four inner slots are formed in the inner wall of the lifting cylinder, a second telescopic rod is fixedly installed on the inner end side wall of each of the four inner slots, four clamping blocks are fixedly installed on the telescopic ends of the four second telescopic rods, the four clamping blocks are in sliding connection with the inner walls of the four inner slots respectively, a first spring is fixedly connected between each of the four clamping blocks and the inner end side wall of the four inner slots, a upper fixing block is arranged below the center block, a guide column is arranged on the bottom of the upper fixing block, a sliding block is slidably sleeved on the guide column, a bottom block is fixedly installed on the bottom of the guide column, a lifting pipe body is arranged below the bottom block, a first flange is arranged on the bottom block, a second flange is arranged on the lifting pipe body, and a plurality of connecting bolts are arranged on the first flange.

[0009] Preferably, the sealing detection mechanism comprises a detection cylinder fixedly installed on the bottom of the water storage box, a transmission rod is arranged through the detection cylinder and is in sliding connection with the detection cylinder, one end of the transmission rod is fixedly connected to the top of the center block, the other end of the transmission rod is fixedly installed with a piston in sliding connection with the inner wall of the detection cylinder, a second spring is fixedly connected between the piston and the inner bottom of the detection cylinder, and a suction pipe and a detection pipe are arranged on the detection cylinder and are in communication with the inside of the detection cylinder.

[0010] Preferably, the upper fixing block and the sliding block are matched with the lifting cylinder, the vertical section of each of the four clamping blocks is a right trapezoidal shape, and the outer side walls of the upper fixing block and the sliding block are curved surfaces.

[0011] Preferably, one end of the suction pipe and the detection pipe in communication with the detection cylinder is located above the piston, and a one-way valve is arranged in each of the suction pipe and the detection pipe.

[0012] Preferably, one end of the suction pipe away from the detection cylinder is in communication with the water storage box, and one end of the detection pipe away from the detection cylinder penetrates the displacement rod.

[0013] The application also discloses a vertical shaft inner pipeline laser welding method.

[0014] First, the hoisting pipe body is connected and fixed with the bottom block through connecting bolts, and after the connection is completed, the hoisting pipe body is located directly below the hoisting cylinder;

[0015] Second, the hoisting pipe body is hoisted into the shaft and is butt-jointed with another pipe body by adjusting the motor, the hydraulic cylinder and the hoisting release mechanism; when the hoisting pipe body is hoisted, the righting block is abutted against the outer wall of the hoisting pipe body through the auxiliary righting mechanism, so that the hoisting pipe body is righted, and the butt-joint accuracy is improved;

[0016] Third, the butt-joint part of the hoisting pipe body and another pipe body in the shaft is laser welded, and after the welding is completed, the sealing detection mechanism is used to spray water on the welded part to detect the sealing property of the welding, the hoisting pipe body is separated from the hoisting cylinder through the hydraulic cylinder and the hoisting release mechanism, and the hoisting pipe body is separated and removed from the bottom block through the connecting bolts.

[0017] The beneficial effects of the present application are as follows:

[0018] The automatic grabbing and releasing functions of the pipeline are realized through the hoisting release mechanism; when the hydraulic cylinder drives the hoisting cylinder to move downward, the curved surface of the upper fixed block is in contact with the trapezoidal inclined surface of the clamping block, the clamping block is triggered to compress the first spring and then reset, the automatic locking of the upper fixed block is completed, the automatic release is realized through secondary pressing after the welding is completed, and the problems of pipeline hoisting and quick release in the narrow space in the shaft are solved.

[0019] The auxiliary swinging mechanism is provided, the center block can be driven to move downward through the self-weight of the hoisting pipe body, the four displacement rods are synchronously contracted toward the center through the transmission action of the connecting rod, the righting block forms a ring-shaped clamping structure, the outer wall of the pipeline is limited on the vertical axis, and the problems of easy swinging of the pipe body and great welding difficulty in the hoisting process of the deep shaft are effectively solved.

[0020] The sealing detection mechanism is provided, the piston is driven to move downward through the self-weight of the hoisting pipe body during hoisting, the water of the water storage box is temporarily stored in the detection cylinder, the second spring drives the piston to move upward when the center block is reset through the contraction of the hydraulic cylinder after the welding is completed, the water is sprayed to the welding opening through the detection pipe, and the sealing property detection is completed.

[0021] The present application can realize the grabbing and secondary pressing release of the hoisting pipe body, the auxiliary swinging mechanism is used to drive the connecting rod to synchronously contract through the self-weight of the hoisting pipe body, a ring-shaped vertical constraint is formed, the influence of hoisting swinging on the welding precision is effectively reduced, the sealing detection mechanism is provided, the welded part can be automatically sprayed with water to detect the sealing property after the welding is completed, and the automation degree is high. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a three-dimensional structure schematic view of one side of the pipeline laser welding device in the shaft;

[0023] Figure 2Another side of the vertical shaft in the pipeline laser welding device is a three-dimensional structure schematic view of the application;

[0024] Figure 3 A three-dimensional structure schematic view of the application along the center block is provided.

[0025] Figure 4 A three-dimensional structure schematic view of the application is provided. Figure 3 A three-dimensional structure schematic view of the application is provided.

[0026] Figure 5 A three-dimensional structure schematic view of the application is provided. Figure 3 A three-dimensional structure schematic view of the application is provided.

[0027] Figure 6 A three-dimensional structure schematic view of the application is provided. Figure 3 A three-dimensional structure schematic view of the application is provided.

[0028] 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 edge block, 11 detection cylinder, 12 detection pipe, 13 connecting rod, 14 displacement groove, 15 first telescopic rod, 16 displacement rod, 17 center block, 18 hoisting cylinder, 19 righting 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 hoisting pipe body, 32 second spring, 33 suction pipe, 34 piston, 35 transmission rod. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application.

[0030] Referring to Figures 1-6The utility model provides a kind of laser welding device of pipeline in shaft, two support blocks 6 are fixedly installed in the two sides of shaft respectively, the top of two support blocks 6 is fixedly installed with same top plate 1, the top of top plate 1 is equipped with moving groove 4, as the guide rail of screw transmission system, screw rod 2 is rotatably connected between the inner wall of both ends of moving groove 4, screw rod 2 is equipped with the moving block 3 of being connected with it screw, moving block 3 is slidably connected with the inner wall of both sides of moving groove 4, adjusting motor 5 is fixedly installed on the outer wall of one side of top plate 1, one end of screw rod 2 penetrates the inner wall of one end of moving groove 4 and is fixedly connected with the output shaft of adjusting motor 5, the bottom of moving block 3 is fixedly installed with two hydraulic cylinders 7, as lifting drive mechanism, the vertical motion of control water storage box 8, two hydraulic cylinders 7 are fixedly installed with connecting plate 9 on the telescopic end, two connecting plates 9 are fixedly installed with water storage box 8 between, the center block 17 of water storage box 8 is provided below, the center block 17 is provided with four auxiliary righting mechanisms, for automatic correction pipeline butt joint angle, ensure welding quality, auxiliary righting mechanism includes the side block 10 fixedly installed in the outside of center block 17, the top of side block 10 is equipped with displacement slot 14, displacement slot 14 is equipped with displacement rod 16 with the inner wall sliding connection of being penetrated, the inner wall of one end of displacement slot 14 is fixedly installed with first telescopic rod 15, the telescopic end of first telescopic rod 15 is fixedly connected in displacement rod 16, the top of displacement rod 16 is rotatably connected with one end of two connecting rods 13, the other end of two connecting rods 13 is rotatably connected on water storage box 8, the side wall of displacement rod 16 close to center block 17 is fixedly installed with righting resistance block 19.

[0031] The lower of center block 17 is provided with hoisting release mechanism, for realizing the grabbing hoisting of hoisting pipe body 31 and subsequent release separation, hoisting release mechanism includes hoisting cylinder 18 fixedly installed on the bottom of center block 17, the inner wall of hoisting cylinder 18 is equipped with four inner grooves 25, the inner end side wall of four inner grooves 25 is fixedly installed with second telescopic rod 26, four second telescopic rods 26 are fixedly installed with four clamping blocks 28 on the telescopic end, four clamping blocks 28 are slidably connected with the inner wall of four inner grooves 25 respectively, four clamping blocks 28 are fixedly connected with first spring 27 between the inner end side wall of four inner grooves 25 respectively, the lower of center block 17 is provided with upper fixed block 20, the bottom of upper fixed block 20 is provided with guide column 24, guide column 24 is slidably sleeved with sliding block 21, the bottom of guide column 24 is fixedly installed with bottom block 22, the lower of bottom block 22 is provided with hoisting pipe body 31, the bottom block 22 is provided with first flange 23, the hoisting pipe body 31 is provided with second flange 29, the first flange 23 is provided with multiple groups of connecting bolts 30, the upper fixed block 20 and sliding block 21 are adapted with hoisting cylinder 18, the vertical section of four clamping blocks 28 is all right angle trapezoidal shape, the outer side wall of upper fixed block 20 and sliding block 21 is curved surface.

[0032] Four sealing detection mechanisms are arranged on the water storage box 8, which are used for water spraying detection on the welding position to detect the sealing performance, and the use is more convenient. The sealing detection mechanism comprises a detection cylinder 11 fixedly installed on the bottom of the water storage box 8, a transmission rod 35 slidably connected to the bottom of the detection cylinder 11, one end of the transmission rod 35 is fixedly connected to the top of the center block 17, the other end of the transmission rod 35 is fixedly installed with a piston 34 slidably connected to the inner wall of the detection cylinder 11, the second spring 32 is fixedly connected between the piston 34 and the inner bottom of the detection cylinder 11, so as to realize the automatic reset of the piston 34, the detection cylinder 11 is provided with a suction pipe 33 and a detection pipe 12 which are communicated with the inside of the detection cylinder 11, one end of the suction pipe 33 and the detection pipe 12 which are communicated with the detection cylinder 11 is located above the piston 34, the suction pipe 33 and the detection pipe 12 are provided with a one-way valve, which controls the one-way water inlet and outlet, one end of the suction pipe 33 away from the detection cylinder 11 is communicated with the water storage box 8, and the other end of the detection pipe 12 away from the detection cylinder 11 penetrates the displacement rod 16.

[0033] A vertical shaft pipeline laser welding method, comprising the following steps:

[0034] Firstly, the hoisting pipe body 31 is connected and fixed with the bottom block 22 through the connecting bolt 30, and after the connection is completed, the hoisting pipe body 31 is located directly below the hoisting cylinder 18;

[0035] Secondly, the hoisting pipe body 31 is hoisted to the other pipe body in the vertical shaft through the adjustment of the motor 5, the hydraulic cylinder 7 and the hoisting release mechanism, when the hoisting pipe body 31 is hoisted, the auxiliary righting mechanism is used to make the righting block 19 abut against the outer wall of the hoisting pipe body 31 to right it, so that the butt joint accuracy is improved;

[0036] Thirdly, the butt joint of the hoisting pipe body 31 and the other pipe body in the vertical shaft is laser welded, after the welding is completed, the sealing detection mechanism is used to spray water on the welding position to detect the welding sealing performance, the hoisting pipe body 31 is separated from the hoisting cylinder 18 through the hydraulic cylinder 7 and the hoisting release mechanism, and the hoisting pipe body 31 is separated from the bottom block 22 through the connecting bolt 30.

[0037] When the application is used, 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, then the water storage box 8, the center block 17 and the hoisting cylinder 18 are moved downward by a distance through the hydraulic cylinder 7, so that the upper fixed block 20 enters the hoisting cylinder 18, the curved surface of the upper fixed block 20 will be in contact with the inclined surface of the four clamping blocks 28, and with the continuous downward movement of the hoisting cylinder 18 and through the setting of the second telescopic rod 26, the upper fixed block 20 can be moved from below the four clamping blocks 28 to above the four clamping blocks 28, and through the setting of the first spring 27, the four clamping blocks 28 can be reset to limit the upper fixed block 20 (at this time, the clamping block 28 is located between the upper fixed block 20 and the sliding block 21), then the water storage box 8, the center block 17 and the hoisting cylinder 18 are moved upward through the hydraulic cylinder 7, because the upper fixed block 20 is limited by the four clamping blocks 28, so that the upper fixed block 20 and the hoisted hoisting pipe body 31 can be lifted together;

[0038] When the hoisting pipe body 31 is lifted, the weight of the hoisting pipe body 31 will make the center block 17 move away from the water storage box 8, through the setting of 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, the second spring 32 is compressed, and when the center block 17 is away from the water storage box 8, through the setting of the connecting rod 13 and the first telescopic rod 15, the four displacement rods 16 can be close to each other, thereby the four righting blocks 19 can be close to each other, and the four righting blocks 19 close to each other will eventually abut against the outer wall of the hoisting pipe body 31, so that it is not easy to shake, by adjusting the motor 5, the threaded rod 2 can be rotated, thereby 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 moves to the vertical shaft directly above, the hoisting pipe body 31 is moved downward into the vertical shaft to be connected with another pipe body in the vertical shaft through the hydraulic cylinder 7, after the connection is completed, the connection between the hoisting pipe body 31 and the other pipe body is laser welded;

[0039] After the laser welding is completed, the water storage box 8 is moved downward by the hydraulic cylinder 7, in this process, the dead weight of the hoisting pipe body 31 no longer acts on the hoisting cylinder 18 and the center block 17, by setting the second spring 32, the center 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 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 pressing action, so that the water in the detection cylinder 11 is sprayed out between the welding of the hoisting pipe body 31 and the other pipe body through the detection pipe 12, thereby the sealing performance after welding can be detected, when the water storage box 8 and the center block 17 return to the initial position, the water storage box 8, the center block 17 and the hoisting cylinder 18 are moved downward again by the hydraulic cylinder 7, thereby the four clamping blocks 28 and the top of the sliding block 21 are in contact with each other, by setting the second extension rod 26, the four clamping blocks 28 can move to the lower side of the sliding block 21 and be in abutment with the outer curved surface of the sliding block 21 by setting the first spring 27, at this time, the water storage box 8, the center block 17 and the hoisting cylinder 18 are moved upward by the hydraulic cylinder 7, which can make the sliding block 21 slide upward on the guide column 24 by the first spring 27 and the four clamping blocks 28, when the sliding block 21 slides upward to abut against the upper fixed block 20, with the continuous upward movement of the hoisting cylinder 18, the four clamping blocks 28 will move to the upper side of the upper fixed block 20 from the curved surface of the sliding block 21 and the curved surface of the upper fixed block 20, and the sliding block 21 will also slide downward on the guide column 24 to the initial position due to the dead weight, thus 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 can be separated by the connecting bolt 30.

[0040] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A laser welding device for pipes inside a vertical shaft, comprising two support blocks (6), characterized in that, 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). A threaded rod (2) is rotatably connected between the inner walls of the two ends of the moving groove (4). A moving block (3) is provided on the threaded rod (2) and threadedly connected to it. The moving block (3) is slidably connected to the inner walls of both sides of the moving groove (4). An adjusting 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 adjusting motor (5). Two hydraulic cylinders (7) are fixedly mounted at the bottom of the moving block (3). A connecting plate (9) is fixedly mounted on the telescopic end of the two hydraulic cylinders (7). A water storage box (8) is fixedly installed between the two connecting plates (9). A central block (17) is set directly below the water storage box (8). Four auxiliary alignment mechanisms are set on the central block (17). The auxiliary alignment mechanisms include side blocks (10) fixedly installed on the outside of the central block (17). A displacement groove (14) is opened on the top of the side block (10). A displacement rod (16) is slidably connected to the inner wall of the displacement groove (14). A first telescopic rod (15) is fixedly installed 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). A leveling block (19) is fixedly installed on the side wall of the displacement rod (16) near the center block (17). A hoisting release mechanism is provided below the center block (17). The hoisting release mechanism includes a hoisting cylinder (18) fixedly installed on the bottom of the center block (17). Four inner grooves (25) are opened on the inner wall of the hoisting cylinder (18). A second telescopic rod (26) is fixedly installed on the inner end side wall of each of the four inner grooves (25). Four locking blocks (28) are fixedly installed on the telescopic ends of each of the four second telescopic rods (26). The four locking blocks (28) are slidably connected to the inner walls of the four inner grooves (25). (28) A first spring (27) is fixedly connected to the inner end sidewall of the four inner grooves (25). An upper fixing block (20) is provided below the center block (17). A guide post (24) is provided at the bottom of the upper fixing block (20). A sliding block (21) is slidably fitted on the guide post (24). A bottom block (22) is fixedly installed at the bottom of the guide post (24). A lifting pipe 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 lifting pipe body (31). Multiple sets of connecting bolts (30) are provided on the first flange (23). Four sealing detection mechanisms are provided on the water storage box (8).The sealing detection mechanism includes a detection cylinder (11) fixedly installed on the bottom of the water storage box (8). A transmission rod (35) is slidably connected to the bottom of the detection cylinder (11). One end of the transmission rod (35) is fixedly connected to the top of the center block (17). A piston (34) is fixedly installed at the other end of the transmission rod (35) and 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). The detection cylinder (11) is provided with a suction pipe (33) and a detection pipe (12) communicating with its interior.

2. The laser welding device for pipes inside a vertical shaft according to claim 1, characterized in that, The upper fixing block (20) and the sliding block (21) are both adapted to the hoisting cylinder (18). The vertical cross-section of the four locking blocks (28) is a right trapezoidal shape, and the outer side walls of the upper fixing block (20) and the sliding block (21) are curved surfaces.

3. The laser welding device for pipelines inside a vertical shaft according to claim 2, characterized in that, The ends of the suction tube (33) and the detection tube (12) connected to the detection cylinder (11) are both located above the piston (34), and both the suction tube (33) and the detection tube (12) are equipped with one-way valves.

4. The laser welding device for pipelines inside a vertical shaft according to claim 3, characterized in that, The end of the suction tube (33) away from the detection cylinder (11) is connected to the water storage box (8), and the end of the detection tube (12) away from the detection cylinder (11) passes through the displacement rod (16).

5. A welding method for a laser welding device for pipes inside a vertical shaft according to claim 4, characterized in that, Includes the following steps: First, the hoisting pipe (31) is connected and fixed to the bottom block (22) by connecting bolts (30). After the connection is completed, the hoisting pipe (31) is positioned directly below the hoisting cylinder (18). The second step is to lift the lifting pipe (31) into the shaft and connect it with another pipe by adjusting the motor (5), hydraulic cylinder (7) and lifting release mechanism. When the lifting pipe (31) is lifted, the auxiliary straightening mechanism is used to make the straightening block (19) abut against the outer wall of the lifting pipe (31) to straighten it and improve the docking accuracy. The third step is to perform laser welding on the joint between the hoisting pipe (31) and another pipe in the shaft. After the welding is completed, the welding joint is sprayed with water to test its welding seal through the sealing detection mechanism. The hoisting pipe (31) is separated from the hoisting cylinder (18) by the hydraulic cylinder (7) and the hoisting release mechanism, and the hoisting pipe (31) is separated from the bottom block (22) by the connecting bolts (30).

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