Large tonnage pipe laying butt welding apparatus and method

Abstract

The application discloses a large-tonnage pipeline laying butt welding equipment and a method thereof, and relates to the technical field of pipeline installation equipment. The equipment comprises a wheel box, locking wheels installed at the bottom of the wheel box, and two groups of brake mechanisms arranged at the top of the wheel box to improve the stability of the wheel box. A traction mechanism for splicing pipelines is arranged at the top of the brake mechanisms. A positioning mechanism for positioning pipelines is further arranged at the top of the brake mechanisms. The positioning mechanism comprises a pipe fitting fixedly installed at the top of the base. An oil tank is slidably installed at the end of the pipe fitting. A plurality of groups of positioning hydraulic rods are fixedly installed at the outer side of the oil tank. The positioning mechanism cooperates with the traction mechanism to sequentially complete self-positioning of the wheel box, splicing of the pipelines, positioning of the pipeline interfaces and welding work. The large-tonnage pipeline laying butt welding equipment and the method thereof have the effects of automation, multifunction and high operation stability.

Description

Technical Field

[0001] This invention relates to the field of pipeline installation equipment technology, and in particular to a large-tonnage pipeline laying and butt welding equipment and method. Background Technology

[0002] In the technical fields of water conservancy and hydropower pipeline water supply projects, oil and gas pipelines, long-distance, large-diameter pipelines are commonly used. Due to their large size, weight, and length, these pipelines present certain installation difficulties. Currently, the installation of large-diameter pipelines typically involves manual chain hoisting or bulldozing / loading with bulldozers. These methods require a large number of workers, who must operate from outside the pipeline, resulting in low efficiency, difficulty in ensuring installation quality, and various safety hazards.

[0003] A Chinese patent application with application number 202221676303.1 describes a large-diameter, heavy-duty BCCP pipe installation device, comprising: a main frame, with a vertically movable support beam at one end of the main frame, the support beam being fixedly connected to lifting cylinders fixedly installed on both sides of the main frame, the lifting cylinders being used to drive the support beam to move up and down so that both ends abut against the inner wall of the pipe; tensioning cylinders are also arranged opposite to each other on both sides of the main frame and fixedly connected to the support beam, the tensioning cylinders being fixedly connected to an end steel beam positioned on the outer wall of another pipe via a chain; and multiple sets of drive wheel assemblies are arranged at the bottom of the main frame, the drive wheel assemblies being used to drive the main frame to move.

[0004] A current type of large-diameter, heavy-weight pipeline installation equipment has achieved automated pipeline docking. However, in actual operation, on the one hand, the installation equipment is prone to self-slippage during traction, and its own fixing efficiency needs to be improved. On the other hand, when pulling the pipeline with a chain, it is impossible to achieve positioning and calibration at the pipeline docking point, which leads to deviations in the position of the fitting pipeline port. Frequent control and calibration by workers are required, and the work efficiency and completeness still need to be improved. Summary of the Invention

[0005] This invention discloses a large-tonnage pipeline laying and welding equipment and method, aiming to solve the technical problem that the efficiency and completeness of existing large-tonnage pipeline installation equipment on the market need to be improved in actual operation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A large-tonnage pipeline laying and welding equipment includes a wheel box and a locking wheel installed at the bottom of the wheel box. The wheel box is characterized in that two sets of braking mechanisms to improve the stability of the wheel box are provided on the top of the wheel box. The braking mechanism includes two sets of telescopic support rods and longitudinal hydraulic rods symmetrically distributed at both ends of the wheel box. Each set of telescopic support rods and longitudinal hydraulic rods has a base fixedly installed on the top of its top.

[0008] The top of the braking mechanism is equipped with a traction mechanism for splicing the pipes.

[0009] The top of the braking mechanism is also provided with a positioning mechanism for positioning the pipeline. The positioning mechanism includes a pipe fitting fixedly installed on the top of another base. An oil tank is slidably installed at the end of the pipe fitting. Several sets of positioning hydraulic rods are fixedly installed on the outside of the oil tank. An extrusion member is fixedly installed at the end of each positioning hydraulic rod. The extrusion member extrudes and supports the inner wall of the pipeline.

[0010] The end of the extrusion piece is equipped with a laser welding head. Before the traction mechanism pulls the pipeline, hydraulic oil drives several sets of positioning hydraulic rods to extend the extrusion piece, so that the traction mechanism is located at the axial position of the pipeline. After the traction mechanism pulls the pipeline to complete the initial docking, the hydraulic oil drives the extrusion piece to extend while the extrusion piece moves along the pipeline axis to calibrate and align the joint of the two pipelines and cooperate with the laser welding head for welding.

[0011] By setting up a braking mechanism, the wheel box drives the braking mechanism to move to the end of a pipe. The raised braking mechanism can lock the wheel box by compression. In conjunction with the traction mechanism, the two pipes are centered and connected. This significantly improves the stability of the connection while achieving automated pipe connection. At the same time, the positioning mechanism set on the top of the wheel box can perform initial positioning of the wheel box. After the two pipes are connected, it can work with the traction mechanism to complete the secondary positioning of the joint between the two pipes, thereby greatly improving the functionality and completeness of the connection of traditional equipment.

[0012] In a preferred embodiment, a set of electric push rods are symmetrically installed at both ends of the base, and a brake is rotatably installed at the output end of each set of electric push rods, the brake being pressed against the inner wall of the pipe.

[0013] By incorporating a braking mechanism on the wheel box, the wheel box drives the braking mechanism to move to the end of a pipe. The raised base can then move to the pipe's axis. With the output ends of two sets of electric push rods extending outward, two brake components are pressed against the inner walls on both sides of the pipe's axis. This compression, combined with the electronic locking of the locking wheel, locks the wheel box in multiple directions, significantly improving the stability of the connection process while achieving automated pipe docking.

[0014] In a preferred embodiment, the traction mechanism includes a winch fixedly mounted on top of the base, with a steel cable wound around the outer side of the winch, the steel cable passing through the interior of the base, and a hook fixedly mounted at the end of the steel cable.

[0015] By installing a steel cable structure on the top of the wheel box that is pulled by a winch, when the wheel box is locked to the end of one pipe, the hook at the end of the steel cable is connected to the end of another pipe, and the winch is used to wind up the steel cable to pull the two pipes to center and splice them, thereby realizing automated pipe docking and improving the safety and convenience of pipe docking.

[0016] In a preferred embodiment, a telescopic pipe is installed through the side of the oil tank, and an oil pipe is connected to the other end of the telescopic pipe, which is connected to the oil circuit of an external pump.

[0017] By adding an oil tank structure that slides onto the outside of the pipe fittings in addition to the wheel box, when the wheel box is located at the end of a pipe, the taut steel cable will cause the hook to press against the outside of the oil tank. As the oil circuit inside the oil tank is connected, the telescopic pipe is limited by the steel cable, and the positioning hydraulic rod pushed by the cable moves the pressing component outward, pressing against the inner wall of the pipe and initially centering the wheel box. When the hook pulls the ends of two pipes together, as the oil circuit inside the oil tank is connected, the telescopic pipe loses its limiting force and pushes the oil tank to move. This causes the positioning hydraulic rod to be located at the end of another pipe, and the positioning hydraulic rod pushed by the cable moves the pressing component outward, pressing against the inner wall of the other pipe and centering the joint of the two pipes. This, combined with the traction mechanism, enables different functions, significantly improving the functionality and completeness of traditional equipment during operation.

[0018] In a preferred embodiment, each of the telescopic struts is fitted with a clamp on its outer side, and the top of the wheel box is provided with a hinge, the clamp and the hinge being fixedly connected.

[0019] By installing clamps and hinges between the telescopic struts and wheel boxes, the clamps and hinges work together to support the base. When the equipment is not in use, the entire base can be flipped by pulling out the hinges, thereby reducing the footprint of the equipment and improving its functionality.

[0020] A method for butt welding equipment for laying large-tonnage pipelines includes the following steps:

[0021] S1. Control the locking wheel to drive the wheel box to move horizontally along the inside of a pipe until the wheel box moves to the end of the pipe;

[0022] S2. The positioning hydraulic rod extends to position the pipe fitting and braking mechanism at the pipe axis. After the braking mechanism locks in place, the positioning hydraulic rod retracts.

[0023] S3. Connect the hook to another pipe and use a winch to wind up and pull the pipe to achieve docking;

[0024] S4. The positioning hydraulic rod continues to extend, and the extrusion part moves along the pipe axis to calibrate and align the joint of the two pipes, and to cooperate with the laser welding head for welding.

[0025] As can be seen from the above, the large-tonnage pipeline laying and welding equipment and method provided by the present invention have the following technical effects.

[0026] Firstly, by incorporating a braking mechanism into an existing large-diameter, heavy-weight pipeline installation device, the braking mechanism is moved to the end of a pipeline using a wheel box. The raised base then moves to the pipeline's axis. With the output ends of two sets of electric push rods extending outwards, two brake components press against the inner walls on both sides of the pipeline's axis. This pressing action, combined with the electrically controlled locking of the locking wheel, locks the wheel box in multiple directions, significantly improving the device's stability. Furthermore, an additional steel cable structure, pulled by a winch, pulls the two pipelines together for alignment. This achieves automated pipeline connection while enhancing safety and convenience during the connection process.

[0027] Secondly, by adding an oil tank structure that slides on the outside of the pipe fittings on top of the wheel box, when the wheel box is located at the end of a pipe, the taut steel cable will cause the hook to press against the outside of the oil tank. As the oil circuit inside the oil tank is connected, the telescopic pipe is limited by the steel cable, and the positioning hydraulic rod pushed by the cable moves the pressing component outward, pressing against the inner wall of the pipe and forming a preliminary centering position for the wheel box. When the hook pulls the ends of two pipes together, as the oil circuit inside the oil tank is connected, the telescopic pipe loses its limiting force and pushes the oil tank to move, which in turn causes the positioning hydraulic rod to be located at the end of another pipe. The positioning hydraulic rod pushed by the cable moves the pressing component outward, pressing against the inner wall of the other pipe and achieving a circular centering position at the joint of the two pipes. This, combined with the traction mechanism, achieves different functions, greatly improving the functionality and completeness of traditional equipment during operation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the first-view structure proposed in this invention.

[0029] Figure 2 This is a schematic diagram of the second-view structure proposed in this invention.

[0030] Figure 3The present invention proposes Figure 2 Enlarged view of the structure at point A in the middle.

[0031] Figure 4 This is a schematic diagram of the braking mechanism proposed in this invention.

[0032] Figure 5 This is a schematic diagram of the positioning mechanism proposed in this invention.

[0033] Figure 6 This is a side view of the device proposed in this invention located inside a pipeline.

[0034] Figure 7 This is a schematic diagram of the device storage state proposed in this invention.

[0035] Figure 8 The device operating state proposed in this invention Figure 1 .

[0036] Figure 9 The device operating state proposed in this invention Figure 2 .

[0037] Figure 10 The device operating state proposed in this invention Figure 3 .

[0038] In the diagram: 1. Wheel box; 2. Locking wheel; 3. Braking mechanism; 301. Telescopic strut; 302. Base; 3021. Through port; 303. Electric push rod; 304. Brake component; 305. Clamp; 306. Hinge component; 307. Longitudinal hydraulic rod; 4. Traction mechanism; 401. Winch; 402. Steel cable; 403. Hook; 404. Cross positioning component; 5. Positioning mechanism; 501. Pipe fitting; 5011. Through cavity; 502. Oil tank; 503. Positioning hydraulic rod; 504. Extrusion component; 5041. Auxiliary wheel; 505. Telescopic tube; 506. Oil pipe; 507. Sliding groove; 6. Photoelectric transmitter; 7. Photoelectric receiver; 8. Laser welding head. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] The invention discloses a large-tonnage pipeline laying and welding equipment and method, which is mainly applied to the scenario of connecting and installing large pipelines.

[0041] Reference Figures 1 to 10A large-tonnage pipeline laying butt welding equipment and method thereof, including a wheel box 1 and a locking wheel 2 installed at the bottom of the wheel box 1. The top of the wheel box 1 is provided with two sets of braking mechanisms 3 to improve the stability of the wheel box 1. The braking mechanism 3 includes two sets of telescopic support rods 301 and longitudinal hydraulic rods 307 symmetrically distributed at both ends of the wheel box 1. A base 302 is fixedly installed on the top of each set of telescopic support rods 301 and longitudinal hydraulic rods 307.

[0042] The top of the braking mechanism 3 is equipped with a traction mechanism 4 for splicing the pipes;

[0043] The top of the braking mechanism 3 is also provided with a positioning mechanism 5 for positioning the pipeline. The positioning mechanism 5 includes a pipe fitting 501 fixedly installed on the top of another base 302. An oil tank 502 is slidably installed at the end of the pipe fitting 501. Several sets of positioning hydraulic rods 503 are fixedly installed on the outside of the oil tank 502. Each positioning hydraulic rod 503 has a pressing member 504 fixedly installed at its end. The pressing member 504 presses and supports the inner wall of the pipeline.

[0044] The positioning mechanism 5, in conjunction with the traction mechanism 4, sequentially completes the self-positioning of the wheel box 1, the splicing of the pipe, and the positioning and welding of the pipe interface. The end of the extrusion part 504 is equipped with a laser welding head 8. Before the traction mechanism 4 pulls the pipe, hydraulic oil drives several sets of positioning hydraulic rods 503 to extend the extrusion part 504, so that the traction mechanism 4 is located at the axial position of the pipe. After the traction mechanism 4 pulls the pipe to complete the initial docking, while the hydraulic oil drives the extrusion part 504 to extend, the extrusion part 504 moves along the pipe axis to calibrate and align the joint of the two pipes, and cooperates with the laser welding head 8 to weld. A photoelectric transmitter 6 is provided on the top of the base 302 connected to the telescopic support rod 301, and a photoelectric receiver 7 is provided on the top of the base 302 connected to the longitudinal hydraulic rod 307.

[0045] In this embodiment: the worker controls the locking wheel 2 to drive the wheel box 1 to move horizontally along the inside of a pipe until the wheel box 1 moves to the end of the pipe. At the same time, the worker controls the pump to inject hydraulic oil into the oil tank 502 and drives the positioning hydraulic rod 503 to extend. As several sets of positioning hydraulic rods 503 extend, the pipe fitting 501 will be positioned at the axis of the pipe. During this process, the telescopic support rod 301 will rise synchronously. The telescopic support rod 301 is driven and has no active extension function. Thus, it plays the role of positioning the braking mechanism 3 at the axis of the pipe using the positioning mechanism 5. Then, the longitudinal hydraulic rod 307 actively drives another set of bases 302 to rise until the photoelectric receiver 7 receives the photoelectric signal emitted by the photoelectric transmitter 6. The controller controls the longitudinal hydraulic rod 307 to stop running. At this point, both bases 302 are at the axis of the pipe.

[0046] Furthermore, a set of electric push rods 303 are symmetrically installed at both ends of the base 302. Each set of electric push rods 303 has a brake 304 rotatably installed at its output end. The brake 304 presses against the inner wall of the pipe. While the two bases 302 are positioned, the electric push rods 303 at both ends of the base 302 move synchronously, extending their output shafts outward and causing the brake 304 to press against and lock against the inner wall of the pipe. The locking wheel 2 locks synchronously. The specific state is shown in the attached figure. Figure 8 As shown, the positioning of wheel box 1 is completed;

[0047] After positioning wheel box 1, the worker can control the positioning hydraulic rod 503 to retract and reset. Then, the other pipe is horizontally lowered to the ground using a crane. Simultaneously, the traction mechanism 4 is horizontally connected to the outside of the other pipe and pulled horizontally, causing the two pipes to gradually come together. The specific state is shown in the attached figure. Figure 9 As shown; during the process of joining the two pipes, the positioning hydraulic rod 503 operates again. Unlike the first operation, which was limited by the taut traction mechanism 4, the positioning mechanism 5, operating for the second time, will move slightly to the end of the other pipe. At the same time, the positioning mechanism 5 extends outward again for positioning, cooperating with the pulling of the traction mechanism 4 to complete the positioning and splicing of the two pipes. The specific state is shown in the attached figure. Figure 10 As shown, if the pipeline needs to be welded and fixed, such as oil and gas pipelines, the laser welding head 8 can be used to spot weld and fix the joint. After the docking equipment is removed from the pipeline, further welding can be carried out manually. The accuracy of the welding position of the laser welding head 8 can be calibrated with the help of a visual recognition system. This is existing technology and will not be described in detail here.

[0048] Reference Figures 1 to 2 , Figures 8 to 10 In a preferred embodiment, the traction mechanism 4 includes a winch 401 fixedly mounted on the top of a base 302. A steel cable 402 is wound on the outer side of the winch 401 and extends through the interior of the base 302. A hook 403 is fixedly mounted on the end of the steel cable 402.

[0049] Since a wheel box 1 is equipped with two bases 302, after the wheel box 1 and the two bases 302 are positioned, the steel cable 402 is also located at the axis of the pipe, ensuring the accuracy of the steel cable 402 when pulling the pipe and reducing deviation. At this time, the worker controls the winch 401 to run and unwinds the taut steel cable 402. At the same time, the hook 403 at the end of the steel cable 402 is engaged with the outer end of another pipe. Then the winch 401 is controlled to rewind, thereby pulling the two pipes to move in the center and splice them.

[0050] Specifically, a cross-shaped positioning element 404 is attached to the end of the hook 403. The cross-shaped positioning element 404 is engaged with the outside of the pipe, thereby assisting the traction of the steel cable 402 to pull the pipe. The cross-shaped positioning element 404 can be a cross-shaped adjustable bracket. The hook 403 is attached to the center of the cross-shaped positioning element 404 and is located at the axis of the pipe.

[0051] Reference Figures 1 to 2 , Figures 4 to 10 In a preferred embodiment, a telescopic pipe 505 is installed through the side of the oil tank 502, and the other end of the telescopic pipe 505 is connected to an oil pipe 506, which is connected to an external pump oil circuit.

[0052] During the process of controlling the external pump to introduce hydraulic oil into the oil tank 502 via the oil pipe 506, the telescopic pipe 505 connected to the oil pipe 506 cannot extend due to the constraint of the taut steel cable 402, thus preventing the oil tank 502 from changing position. At this time, the hydraulic oil will push the positioning hydraulic rod 503 and cause the extrusion member 504 to extend outward. Simultaneously, the telescopic support rod 301 will passively extend, and the base 302, pushed by the positioning hydraulic rod 503, will move synchronously towards the axis of the pipeline. Then, the positioning mechanism 5 will position the base 302 to the axis of the pipeline. At the heart of the matter; as the two pipes gradually come together, the external pump starts running again. Unlike the initial operation, when it was limited by the taut steel cable 402, the telescopic tube 505, now freed from the constraint of the steel cable 402, is pushed and extended as the hydraulic oil inside the oil pipe 506 is connected. Simultaneously, this extension pushes the oil tank 502 to move slightly along the outside of the fitting 501 to the end of the other pipe. At the same time, the positioning hydraulic rod 503 extends outward and presses against the unsealed joint of the two pipes, thus aligning and calibrating the joint to ensure it is flush. The specific details are shown in the attached diagram. Figure 10 As shown.

[0053] The outer side of the pipe fitting 501 is provided with a sliding groove 507, and the oil tank 502 is slidably connected to the outer side of the sliding groove 507, thereby limiting the oil tank 502.

[0054] Furthermore, each extrusion piece 504 has an auxiliary wheel 5041 rotatably mounted inside. The auxiliary wheel 5041 slides in contact with the inner wall of the pipe, thereby reducing the friction between the extrusion piece 504 and the pipe.

[0055] Specifically, each base 302 has a through-hole 3021 in the middle, through which the steel cable 402 passes. The pipe 501 has a cavity 5011 inside, through which the steel cable 402 passes and pulls the hook 403 to press against the outside of the oil tank 502, thereby limiting the oil tank 502 under normal conditions.

[0056] Before the pipeline is moved and calibrated, a pipeline moving device needs to be laid on the ground. The pipeline moving device can refer to the Chinese utility model patent applied for by the applicant, publication number CN210939056U. This pipeline moving device is responsible for moving the pipeline to be connected.

[0057] Reference Figures 2 to 3 , Figure 7 In a preferred embodiment, each telescopic strut 301 is fitted with a clamp 305 on its outer side, and the wheel box 1 is provided with a hinge 306 on its top. The clamp 305 and the hinge 306 are fixedly connected.

[0058] Under normal conditions, the clamp 305 and the hinge 306 work together to support the base 302. When the entire device is not in use, the entire base 302 is flipped and stored by pulling out the hinge 306, thereby reducing the footprint of the device. The steel cable 402 is in a loose state when stored. The specific structure is shown in the attached figure. Figure 7 As shown.

[0059] Working principle: During use, the worker controls the locking wheel 2 to move the wheel box 1 horizontally along the inside of a pipe until the wheel box 1 reaches the end of the pipe. Under normal conditions, the steel cable 402 is taut. At this time, the external pump is controlled to introduce hydraulic oil into the oil tank 502 through the oil pipe 506. Simultaneously, due to the restriction of the taut steel cable 402, the telescopic pipe 505 connected to the oil pipe 506 cannot extend, thus preventing the oil tank 502 from changing position. At this time, the hydraulic oil pushes the positioning hydraulic rod 503 and causes the extrusion part 504 to extend outward. During the extension, the telescopic support rod 301 is passively extended. Then, the positioning mechanism 5 positions the base 302 at the axis of the pipeline. Subsequently, the longitudinal hydraulic rod 307 actively drives the other set of bases 302 to rise until the photoelectric receiver 7 receives the photoelectric signal emitted by the photoelectric transmitter 6. The controller then controls the longitudinal hydraulic rod 307 to stop running. At this point, both bases 302 are at the axis of the pipeline. Then, the electric push rods 303 located at both ends of the bases 302 operate synchronously, extending the output shaft outward and driving the brake 304 to squeeze and jam against the inner wall of the pipeline. After completing the positioning of the wheel box 1, the external pump stops introducing hydraulic oil into the oil pipe 506. The specific state is as shown in the attached figure. Figure 8 As shown;

[0060] After positioning wheel box 1, the worker controls winch 401 to unwind the taut steel cable 402, simultaneously engaging the hook 403 at the end of the steel cable 402 with the outside of a cross-shaped positioning piece 404, and engaging the cross-shaped positioning piece 404 with the outside of another pipe. Then, the winch 401 is controlled to rewind, pulling the two pipes to move and join them together. The specific steps are shown in the attached figure. Figure 9 As shown;

[0061] During the gradual joining of the two pipes, the external pump operates again. Unlike the initial operation where it was limited by the taut steel cable 402, the telescopic tube 505, now freed from the cable 402's constraint, extends as the hydraulic oil inside the oil pipe 506 is connected. This extension pushes the oil tank 502 to move slightly horizontally along the outside of the fitting 501 to the end of the other pipe. Simultaneously, the positioning hydraulic rod 503 extends outward, thereby aligning and calibrating the other pipe to ensure the connection accuracy of the two pipe ends. The specific details are shown in the attached diagram. Figure 10 As shown, the laser welding head 8 can be used to spot weld and fix the joint. After the welding equipment is removed from the pipe, further welding can be performed manually.

[0062] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A large tonnage pipe laying butt welding equipment, comprising a wheel box (1) and a locking wheel (2) mounted on the bottom of the wheel box (1), characterized in that, The top of the wheel box (1) is provided with two groups of brake mechanisms (3) for improving the stability of the wheel box (1), the brake mechanisms (3) comprise two groups of telescopic struts (301) and longitudinal hydraulic rods (307) symmetrically distributed at both ends of the wheel box (1), and a base (302) is fixedly installed at the top of each group of telescopic struts (301) and longitudinal hydraulic rods (307); The top of the brake mechanism (3) is provided with a traction mechanism (4) for splicing pipelines, the traction mechanism (4) comprises a winch (401) fixedly installed at the top of one base (302), a steel cable (402) is wound on the outer side of the winch (401), the steel cable (402) penetrates from the inside of the base (302) and comes out, and a hook (403) is fixedly installed at the end of the steel cable (402); The top of the brake mechanism (3) is also provided with a positioning mechanism (5) for positioning pipelines, the positioning mechanism (5) comprises a pipe fitting (501) fixedly installed at the top of another base (302), an oil tank (502) is slidingly installed at the end of the pipe fitting (501), a plurality of groups of positioning hydraulic rods (503) are fixedly installed on the outer side of the oil tank (502), an extrusion piece (504) is fixedly installed at the end of each positioning hydraulic rod (503), the extrusion piece (504) is extruded and supported on the inner wall of the pipeline, a telescopic pipe (505) is throughly installed on the side of the oil tank (502), an oil pipe (506) is throughly connected to the other end of the telescopic pipe (505) and connected to the oil circuit of an external pump, a through cavity (5011) is formed in the inside of the pipe fitting (501), the steel cable (402) penetrates from the inside of the through cavity (5011) and extrudes the hook (403) to contact the outer side of the oil tank (502), and an auxiliary wheel (5041) is rotatably installed in the inside of each extrusion piece (504) and slidingly contacts the inner wall of the pipeline; The end of the extrusion piece (504) is provided with a laser welding head (8), before the traction mechanism (4) pulls the pipeline, the hydraulic oil drives a plurality of groups of positioning hydraulic rods (503) to drive the extrusion piece (504) to extend, so that the traction mechanism (4) is located at the axial position of the pipeline, after the traction mechanism (4) pulls the pipeline to complete the initial butt joint, the extrusion piece (504) moves along the axial direction of the pipeline while extending under the drive of the hydraulic oil, so as to calibrate and align the joint of the two pipelines, and cooperate with the laser welding head (8) to perform welding; A group of electric push rods (303) are symmetrically installed at both ends of the base (302), an output end of each group of electric push rods (303) is rotatably installed with a brake piece (304), and the brake piece (304) extrudes and contacts the inner wall of the pipeline.

2. A large tonnage pipe laying butt welding apparatus as claimed in claim 1, wherein, The top of the base (302) connected with the telescopic support rod (301) is provided with a photoelectric emitter (6), and the top of the base (302) connected with the longitudinal hydraulic rod (307) is provided with a photoelectric receiver (7).

3. A large tonnage pipe laying butt welding apparatus as claimed in claim 1, wherein, The outer side of each telescopic support rod (301) is sleeved and fixed with a hoop (305), the top of the wheel box (1) is provided with a hinged piece (306), and the hoop (305) and the hinged piece (306) are fixedly connected.

4. A large tonnage pipe laying butt welding apparatus as claimed in claim 3 wherein, The end of the hook (403) is hung with a cross positioning piece (404), and the cross positioning piece (404) is clamped on the outer side of the pipeline.

5. A large tonnage pipe laying butt welding apparatus as claimed in claim 1 wherein, The outer side of the pipe fitting (501) is provided with a sliding groove (507), and the oil tank (502) is slidingly connected to the outer side of the sliding groove (507).

6. A large tonnage pipe laying butt welding apparatus as claimed in claim 3 wherein, The middle part of each base (302) is provided with a through hole (3021), and the steel cable (402) penetrates through the inside of the through hole (3021).

7. The method of using a large tonnage pipe laying butt welding apparatus as defined in claim 1 wherein, The method comprises the following steps: S1, control the locking wheel (2) to drive the wheel box (1) to move horizontally along the inside of a pipeline until the wheel box (1) moves to the end of the pipeline; S2, control the positioning hydraulic rod (503) to extend, so that the pipe fitting (501) and the stopping mechanism (3) are positioned at the axis of the pipeline, and after the stopping mechanism (3) is locked, the positioning hydraulic rod (503) is retracted; S3, connect the hook (403) with another pipeline, and realize butt joint by winding the traction pipeline through the winch (401); S4, the positioning hydraulic rod (503) continues to extend, and the extrusion piece (504) moves along the axis direction of the pipeline, which is used for calibrating and aligning the joint of the two pipelines, and cooperating with the laser welding head (8) to perform welding.

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