Large pipeline welding alignment equipment and method

Abstract

The invention relates to large pipeline welding alignment equipment and a butt joint method, and belongs to the technical field of large pipeline engineering construction. A first pipeline supporting module, a second pipeline supporting module and a fixed supporting piece are sequentially arranged on a bottom plate at intervals, and the first pipeline supporting module and the second pipeline supporting module are the same in structure and used for clamping a large pipeline and adjusting and moving the clamped pipeline in the left-right direction, the front-back direction and the up-down direction. The first pipeline supporting module, the second pipeline supporting module and the fixed supporting piece are each provided with a rotatable V-shaped block, the V-shaped blocks are used for containing a large pipeline, stability is good, influences from the external environment and the operation site environment are small, adjustment is convenient, assembly is rapid, manual control or automatic control can be achieved, and the large pipeline alignment welding device is suitable for field alignment welding operation of the large pipeline. The pipeline butt joint device has the advantages of being easy to operate, safe, reliable, stable in equipment operation, simple in structure, flexible to operate and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline welding, and in particular relates to a pipeline welding alignment device and method. Background Art

[0002] Large pipelines refer to pipelines with long length, heavy weight and large diameter. The traditional process of pipeline docking uses waste steel plate bottom welding and manual docking, which is time-consuming, labor-intensive and low-precision. Traditional manual pipeline docking requires 3-5 workers to cooperate and adjust one by one through hand chain hoists. On average, it takes more than an hour to successfully complete a docking, which is time-consuming and labor-intensive, resulting in great challenges in pipeline alignment. Therefore, it is of great significance to explore an efficient and high-precision large pipeline welding alignment equipment.

[0003] In the prior art, when aligning existing pipeline welding, hydraulic cylinder drive control, V-shaped blocks and angle cylinder clamping technology are used. However, when adjusting the pipeline, only one of the three directions of left and right, front and back, and up and down can be moved, or two of the three directions can be combined. It is very rare to move in three directions of left and right, front and back, and up and down. For example, CN214350621U discloses a pipeline welding auxiliary alignment device. When in use, the first adjustment mechanism rotates to control the first telescopic support frame to be opened and fixed on the inner wall of the pipeline on the left, and then the pipeline to be welded is inserted from the right side, and then the second adjustment mechanism is used to rotate and control the second telescopic support frame to be opened and fixed on the inner wall of the pipeline, and the distance between the two pipelines is adjusted. The two adjustment mechanisms are tightened to allow the support frame to hold the pipeline firmly, and the welding operation begins. The device can only move in the forward and backward directions; CN211804656U discloses a simple pipeline welding alignment device, through which the weld around the steel pipe can be accurately adjusted to a uniform width, and the device can only move in the left and right directions; For example, CN213945492U discloses a pipeline welding auxiliary alignment tool, including a fixed pipe clamping device, a cantilever bracket, a spacing adjustment movable slider, an up and down movable slider, a front and back movable slider and a movable pipe clamping device, which can adjust the gap between two sections of the pipeline, and can adjust the up and down, left and right relative positions between the two sections of the pipeline, which is equivalent to moving in three directions: left and right, front and back, and up and down. However, the pipeline is suspended by a cantilever bracket, which is not suitable for large pipeline welding alignment, because large pipelines have a large mass and are affected by external forces. Once they shake, their kinetic energy is very large, the alignment effect is poor, and even the safety of the operators is affected. Especially for field alignment welding operations, factors such as wind and nearby mechanical operations will cause the suspended large pipelines to shake.

[0004] In the prior art, the V-block is fixed, and its technical defects are not obvious for the welding alignment of small and medium-sized pipes. However, for the welding alignment of large pipes, the technical defects of the fixed V-block are obvious: due to the obvious deflection of the long-length large pipe, there is an angle between the axial direction of the deflected pipe and the surface of the V-block. When the pipe is dragged and moved, the resistance increases, the alignment is also difficult, and even when the pipe is dragged and moved, the outer peripheral surface of the pipe is damaged.

[0005] In view of the above problems, there is a need for large-scale pipeline welding alignment equipment and alignment method. Summary of the invention

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions: On the one hand, a large-scale pipeline welding alignment device is used for outdoor large-scale pipeline welding operations, including a base plate, on which a first pipeline support module, a second pipeline support module and a fixed support are arranged in sequence and spaced apart. The first pipeline support module and the second pipeline support module have the same structure and are used to clamp the large pipeline and adjust and move the clamped pipeline in three directions: left and right, front and back, and up and down. The first pipeline support module, the second pipeline support module and the fixed support are all provided with rotatable V-blocks, and the V-blocks are used to place the large pipeline.

[0007] Preferably, the first pipe supporting module and the second pipe supporting module both include a direction adjusting device and a pipe clamping device.

[0008] A direction adjustment device is used to move the clamped pipe in three-dimensional directions of left and right, front and back, and up and down, and comprises a base, a left and right movable adjustment slide, a front and back movable adjustment slide, an up and down movable adjustment slide and a V-shaped block which are arranged in sequence from bottom to top, wherein the top surface of the base is provided with a first dovetail block which is arranged in the left and right directions, the bottom surface of the left and right movable adjustment slide is provided with a first dovetail groove which is arranged in the left and right directions, the first dovetail block is matched with the first dovetail groove and is slidably connected with the first dovetail groove; the top surface of the left and right movable adjustment slide is provided with a second dovetail block which is arranged in the front and back directions, the bottom surface of the front and back movable adjustment slide is provided with a second dovetail groove which is arranged in the front and back directions, the second dovetail block is matched with the second dovetail groove and is slidably connected with the second dovetail groove; The direction adjustment device also includes left and right hydraulic push rods and left and right hydraulic cylinders. The left and right hydraulic cylinders are connected to the left and right hydraulic cylinder flanges on the left or right side of the base through left and right hydraulic connecting columns. The left and right hydraulic push rods are connected to the left and right movable adjustment slides. The left and right hydraulic cylinders push the left and right movable adjustment slides to move left and right through the left and right hydraulic push rods. The direction adjustment device also includes: front and rear hydraulic push rods and front and rear hydraulic cylinders, the front and rear hydraulic cylinders are connected to the front and rear hydraulic cylinder flanges on the front side or rear side of the left and right movable adjustment slide seat through the front and rear hydraulic connecting columns, the front and rear hydraulic push rods are connected to the front and rear movable adjustment slide seat, and the front and rear hydraulic cylinders push the front and rear movable adjustment slide seat to move forward and backward through the front and rear hydraulic push rods; The forward and backward movable adjustment slide is arranged on the top surface of the forward and backward movable adjustment slide, and comprises a vertical heavy-load hydraulic cylinder, upper and lower hydraulic push rods, a vertical guide rail, a coupling base and a coupling; The vertical heavy-load hydraulic cylinder is fixedly connected to the center of the top surface of the front-rear movable adjustment slide, the vertical guide rails are fixedly connected to both sides of the front-rear movable adjustment slide, and the vertical guide rails are slidably connected to the coupling base; The V-block is fixedly connected to the coupling, the coupling is rotatably connected to the coupling base, the upper and lower hydraulic push rods are connected to the coupling base, and the vertical heavy-duty hydraulic cylinder pushes the V-block up and down through the upper and lower hydraulic push rods, the coupling base and the coupling.

[0009] The same device can be used to adjust and move large pipelines in three dimensions: left and right, front and back, and up and down, saving time for adjustment and movement, shortening the entire process, and improving the efficiency of large pipeline welding alignment.

[0010] Preferably, the pipe clamping device is arranged on the top surface of the V-block and is used to clamp large pipes, including: the pipe clamping device includes an angle clamping cylinder and a pipe clamping block, and the output shaft of the angle clamping cylinder is connected to the pipe clamping block.

[0011] The clamping cylinder cooperates with the V-block to realize automatic positioning and clamping of the pipeline to ensure the stability of the pipeline.

[0012] Preferably, the fixed support member includes a third V-shaped block and a coupling base, the third V-shaped block is provided with a coupling, the coupling base is fixedly connected to the bottom plate, and the third V-shaped block is rotatably connected to the coupling base through the coupling.

[0013] The V-block is rotatable and can follow the deflection of the large pipeline, reducing the resistance during the alignment and movement of the large pipeline.

[0014] Preferably, the first pipe support module is fixedly connected to the base plate via a support block for lifting, and the base of the second pipe support module is fixedly connected to the base plate. Relative to the base plate, the heights of the first pipe support module, the second pipe support module and the fixed support member gradually decrease.

[0015] The first pipe support module, the second pipe support module and the fixed support are arranged from high to low, which can take into account the flexural characteristics of large pipes and facilitate alignment and welding.

[0016] Preferably, the rotation direction of the V-block is forward and backward.

[0017] On the other hand, the present invention discloses a method for welding and aligning a large pipeline based on the above-mentioned large pipeline welding and aligning device, provided that there are at least two sections of large pipelines to be welded, including a first large pipeline and a second large pipeline; Here are the steps: S1: Preparatory steps S1-1: adjusting the pipe clamping blocks of the pipe clamping devices on the first pipe supporting module and the second pipe supporting module to an open state; S1-2: hoisting and placing the first large-scale pipeline on the first V-shaped block of the first pipeline support module and the second V-shaped block of the second pipeline support module; S1-3: adjusting the pipe clamping blocks of the pipe clamping devices on the first pipe supporting module and the second pipe supporting module to a closed state; S1-4: Adjust the pipe clamping block of the pipe clamping device to press down linearly and clamp the first large pipe tightly; S1-5: hoist the second large-scale pipeline, place one end on the third V-shaped block of the fixed support, and place the rest on the ground; S2: Alignment step S2-1: Synchronously controlling the forward and backward movement adjustment slides on the first pipe support module and the second pipe support module to adjust the distance between the sections to be welded of the first large pipe and the second large pipe; S2-2: synchronously controlling the left-right movable adjustment slides on the first pipe support module and the second pipe support module, or independently controlling the left-right movable adjustment slides on the second pipe support module, to adjust the horizontal distance between the centers of the sections to be welded of the first large pipe and the second large pipe; S2-3: synchronously controlling the up-down movement adjustment slides on the first pipe support module and the second pipe support module, or independently controlling the up-down movement adjustment slides on the second pipe support module, to adjust the vertical spacing between the centers of the sections to be welded of the first large pipe and the second large pipe; S3: Welding Steps If in step S2, the first large pipe and the second large pipe are welded to a position where the flux can penetrate the welding position, welding is performed; otherwise, return to step S2 to continue alignment and adjustment.

[0018] In the S2 alignment step, S2-1, S2-2 and S2-3 are executed with priority given to the one with the largest spacing value to be adjusted at the beginning.

[0019] The beneficial effects of this application are: 1. Placing V-blocks on large pipelines can effectively offset external force interference during field operations, have good stability, and are conducive to alignment welding; 2. V-blocks can rotate forward and backward to follow the deflection of large pipelines and reduce resistance during the alignment and movement of large pipelines; 3. The same equipment can adjust and move the pipeline in three directions: left and right, front and back, and up and down. The whole process takes a short time and the pipeline docking accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall assembly of large pipeline welding alignment equipment; Figure 2 is a schematic diagram of the structure of the second pipeline support module; Figure 3 It is a schematic diagram of the assembly of the base, the left-right movable adjustment slide, and the front-back movable adjustment slide; Figure 4 Schematic diagram of adjusting the slide for left and right movement; Figure 5 is a schematic diagram of the second V-block; Figure 6 It is a schematic diagram of the assembly of the pipe clamping device, the second V-shaped block and the vertically movable adjustment slide in the second pipe support module; Figure 7 It is a working schematic diagram of the present invention.

[0021] Figure 1-7 Middle: 100. bottom plate; 200. first pipeline support module; 300. second pipeline support module; 400. fixed support member; 500. direction adjustment device; 510. base; 511. The first dovetail block; 520. The slide for adjusting the left-right movement; 521. The first dovetail groove; 522. The second dovetail block; 523. The left-right hydraulic push rods; 524. The left-right hydraulic cylinders; 530. The slide for adjusting the front-back movement; 532. The front-back hydraulic push rods; 533. The front-back hydraulic cylinders; 540. The slide for adjusting the up-down movement; 541. The vertical heavy-duty hydraulic cylinders; 542. The upper and lower hydraulic push rods; 543. The vertical guide rails; 544. The coupling base; 545. The coupling; 551. The first V-block; 552. The second V-block; 553. The third V-block; 600. The pipe clamping device; 601. The corner clamping cylinder; 602. The pipe clamping block; 701. The first large pipe; 702. The second large pipe. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use.

[0023] Embodiment 1: Figure 1 As shown, this example discloses a welding alignment device used for outdoor large-scale pipeline welding operations, including a base plate 100. The base plate 100 is made of steel material and has a rectangular shape. It is laid on the ground in the field and does not impose excessive requirements on the flatness of the ground.

[0024] On the center line of the width direction of the bottom plate 100, the first pipeline support module 200, the second pipeline support module 300 and the fixed support member 400 are arranged in sequence and spaced apart. The first pipeline support module 200 is fixedly connected to the bottom plate 100 through a support block for lifting, and the base 510 of the second pipeline support module 300 is fixedly connected to the bottom plate 100. Relative to the bottom plate 100, the heights of the first pipeline support module 200, the second pipeline support module 300 and the fixed support member 400 are gradually reduced. Combined with the characteristics of high mobility of field operations, the fixed connection adopts a detachable fixed connection method such as bolts.

[0025] See also Figure 1-3 The first pipe support module 200 and the second pipe support module 300 have the same structure and are used to clamp large pipes and adjust and move the clamped pipes in three-dimensional directions: left and right, front and back, and up and down. The first pipe support module 200, the second pipe support module 300 and the fixed support member 400 are all provided with rotatable V-blocks, which are used to place large pipes.

[0026] The first pipe supporting module 200 is provided with a first V-shaped block 551 , the second pipe supporting module 300 is provided with a first V-shaped block 552 , and the fixing support member 400 is provided with a first V-shaped block 553 .

[0027] The V-block is used to place the large pipe, which means that the large pipe presses against the inner side of the V-block.

[0028] See also Figure 2-7 The first pipe supporting module 200 and the second pipe supporting module 300 both include a direction adjusting device 500 and a pipe clamping device 600 .

[0029] The direction adjustment device 500 is used to move the clamped pipe in three-dimensional directions of left and right, front and back, and up and down, and includes a base 510, a left and right movement adjustment slide 520, a front and back movement adjustment slide 530, an up and down movement adjustment slide 540 and a V-block arranged in sequence from bottom to top. The top surface of the base 510 has a first dovetail block 511 arranged in the left and right directions, and the bottom surface of the left and right movement adjustment slide 520 has a first dovetail groove 521 arranged in the left and right directions. The first dovetail block 511 is matched with the first dovetail groove 521 and is slidably connected to the first dovetail groove 521; the top surface of the left and right movement adjustment slide 520 has a second dovetail block 522 arranged in the front and back directions, and the bottom surface of the front and back movement adjustment slide 530 has a second dovetail groove arranged in the front and back directions. The second dovetail block 522 is matched with the second dovetail groove and is slidably connected to the second dovetail groove.

[0030] There are two dovetail grooves and dovetail blocks, which are configured in pairs, so that they have good supporting and guiding properties, avoiding loosening of the structure due to vibration during work and causing safety accidents, and ensuring smooth and precise movement of the slide.

[0031] The direction adjustment device 500 also includes left and right hydraulic push rods 523 and left and right hydraulic cylinders 524. The left and right hydraulic cylinders 524 are connected to the left and right hydraulic cylinder flanges on the left or right side of the base 510 through left and right hydraulic connecting columns. The left and right hydraulic push rods 523 are connected to the left and right movable adjustment slide 520. The left and right hydraulic cylinders 524 push the left and right movable adjustment slide 520 to move left and right through the left and right hydraulic push rods 523.

[0032] In this embodiment, the left and right hydraulic cylinders 524 of the first pipe support module 200 and the second pipe support module 300 are connected to the left and right hydraulic cylinder flanges on the right side of the base 510 through the left and right hydraulic connection columns. The direction adjustment device 500 also includes: front and rear hydraulic push rods 532 and front and rear hydraulic cylinders 533. The front and rear hydraulic cylinders 533 are connected to the front and rear hydraulic cylinder flanges on the front side or rear side of the left and right movable adjustment slide 520 through front and rear hydraulic connecting columns. The front and rear hydraulic push rods 532 are connected to the front and rear movable adjustment slide 530. The front and rear hydraulic cylinders 533 push the front and rear movable adjustment slide 530 to move forward and backward through the front and rear hydraulic push rods 532.

[0033] In this embodiment, the front and rear hydraulic cylinders 533 of the first pipe support module 200 are connected to the front and rear hydraulic cylinder flanges on the rear side of the left and right movable adjustment slide 520 through front and rear hydraulic connecting columns; the front and rear hydraulic cylinders 533 of the second pipe support module 200 are connected to the front and rear hydraulic cylinder flanges on the front side of the left and right movable adjustment slide 520 through front and rear hydraulic connecting columns.

[0034] The flange connection is easy to disassemble and assemble, and it is convenient to replace the seal and can also play a throttling and buffering role. The motion module drives the slide to move through the hydraulic cylinder to achieve smooth and rapid adjustment of the left and right displacement of the large pipeline. The hydraulic cylinder and the slide are connected by a flange. The flange connection can be used under various load conditions and is suitable for applications with larger compliance and higher precision requirements. It is suitable for the large pipeline welding and docking device.

[0035] The forward and backward movable adjustment slide 540 is arranged on the top surface of the forward and backward movable adjustment slide 530, and includes a vertical heavy-duty hydraulic cylinder 541, upper and lower hydraulic push rods 542, a vertical guide rail 543, a coupling base 544 and a coupling 545; The vertical heavy-load hydraulic cylinder 541 is fixedly connected to the center of the top surface of the forward and backward movable adjustment slide 530 , and the vertical guide rails 543 are fixedly connected to both sides of the forward and backward movable adjustment slide 530 . The vertical guide rails 543 are slidably connected to the coupling base 544 .

[0036] The V-block is fixedly connected to the connecting shaft 545, the connecting shaft 545 is rotatably connected to the connecting shaft base 544, the upper and lower hydraulic push rods 542 are connected to the connecting shaft base 544, and the vertical heavy-load hydraulic cylinder 541 pushes the V-block up and down through the upper and lower hydraulic push rods 542, the connecting shaft base 544 and the connecting shaft 545.

[0037] The pipe clamping device 600 is arranged on the top surface of the V-block and is used to clamp large pipes, including: the pipe clamping device 600 includes an angle clamping cylinder 601 and a pipe clamping block 602, and the output shaft of the angle clamping cylinder 601 is connected to the pipe clamping block 602.

[0038] During the working process of the angle clamping cylinder 601, the piston first completes the rotation stroke - the pressure arm presses down and rotates to the designed specified position and angle, closes the pipe clamping block 602, and then completes the clamping stroke - that is, presses down linearly and clamps the large pipe.

[0039] See also Figure 1 and 7 The fixed support member 400 includes a third V-shaped block 553 and a coupling base 544. The third V-shaped block 550 is provided with a coupling 545. The coupling base 544 is fixedly connected to the bottom plate 100. The third V-shaped block 553 is rotatably connected to the coupling base 544 through the coupling 545.

[0040] The V-block is rotatable and can follow the deflection of the large pipeline, reducing the resistance during the alignment and movement of the large pipeline.

[0041] The device of the present invention is simple, flexible in operation and easy to use, and solves the problems of difficulty, time-consuming and high labor and technical requirements in pipe welding in large-scale pipeline construction, shortens the pipe welding time and improves construction efficiency.

[0042] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

[0043] Embodiment 2: This embodiment discloses a large-scale pipeline welding alignment method of a large-scale pipeline welding alignment device, which uses the large-scale pipeline welding docking device in the above embodiment 1 to perform large-scale pipeline welding operations in the field, provided that there are at least two sections of large-scale pipelines to be welded. In this embodiment, two sections of large-scale pipelines to be welded are taken as an example, a first large-scale pipeline 701 and a second large-scale pipeline 702. The method comprises the following steps: S1: Preparatory steps S1-1: adjusting the pipe clamping block 602 of the pipe clamping device 600 on the first pipe supporting module 200 and the second pipe supporting module 300 to an open state; S1-2: hoisting and placing the first large-scale pipeline 701 on the first V-shaped block 551 of the first pipeline support module 200 and the second V-shaped block 552 of the second pipeline support module 300; S1-3: adjusting the pipe clamping blocks 602 of the pipe clamping devices 600 on the first pipe supporting module 200 and the second pipe supporting module 300 to a closed state; S1-4: Adjust the pipe clamping block 602 of the pipe clamping device 600 to press down linearly and clamp the first large pipe 701; S1-5: hoist the second large-sized pipeline 702, place one end of the second large-sized pipeline 702 on the third V-shaped block 553 of the fixed support 400, and place the other end of the second large-sized pipeline 702 on the ground; S2: Alignment step S2-1: Synchronously controlling the forward and backward movement adjustment slide 530 on the first pipe support module 200 and the second pipe support module 300 to adjust the distance between the sections to be welded of the first large pipe 701 and the second large pipe 702; S2-2: synchronously controlling the left-right movable adjustment slide 520 on the first pipe support module 200 and the second pipe support module 300, or independently controlling the left-right movable adjustment slide 520 on the second pipe support module 300, to adjust the horizontal distance between the centers of the sections to be welded of the first large pipe 701 and the second large pipe 702; S2-3: synchronously controlling the up-down movement adjustment slide 540 on the first pipe support module 200 and the second pipe support module 300, or independently controlling the up-down movement adjustment slide 540 on the second pipe support module 300, to adjust the vertical distance between the centers of the sections to be welded of the first large pipe 701 and the second large pipe 702; In step S2, the "control" mentioned here can be performed by an operator based on experience, visual inspection and operation, or by installing an automatic control device.

[0044] S2-1, S2-2 and S2-3 are all optional steps, and only one of the steps, or two or three steps may be performed; after completing one step, another step may be performed and then the previous step may be repeated. As long as the first large pipeline 701 and the second large pipeline 702 are adjusted so that the flux can penetrate the welding position, step S2 is completed.

[0045] S3: Welding Steps If in step S2, the first large pipe 701 and the second large pipe 702 are welded to a position where the flux can penetrate the welding position, welding is performed; otherwise, return to step S2 to continue alignment and adjustment.

[0046] In the S2 alignment step, S2-1, S2-2 and S2-3 are executed with priority given to the one with the largest spacing value to be adjusted at the beginning.

[0047] The so-called "initial time" is before the S2 step is performed.

[0048] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A large-scale pipeline welding alignment device, used for field large-scale pipeline welding operations, comprising a base plate (100), characterized in that: A first pipe support module (200), a second pipe support module (300) and a fixed support member (400) are sequentially arranged at intervals on a bottom plate (100); the first pipe support module (200) and the second pipe support module (300) have the same structure and are used to clamp a large pipe and to adjust and move the clamped pipe in three directions, left and right, front and back, and up and down; the first pipe support module (200), the second pipe support module (300) and the fixed support member (400) are all provided with rotatable V-shaped blocks, and the V-shaped blocks are used to place the large pipe.

2. A large-scale pipeline welding alignment device according to claim 1, characterized in that: The first pipeline support module (200) and the second pipeline support module (300) both comprise a direction adjustment device (500) and a pipeline clamping device (600); The direction adjustment device (500) is used to move the clamped pipe in three-dimensional directions, namely left-right, front-back, and up-down directions, and comprises a base (510), a left-right movable adjustment slide (520), a front-back movable adjustment slide (530), an up-down movable adjustment slide (540), and a V-shaped block, which are arranged in sequence from bottom to top. The top surface of the base (510) is provided with a first dovetail block (511) arranged in the left-right direction, the bottom surface of the left-right movable adjustment slide (520) is provided with a first dovetail groove (521) arranged in the left-right direction, the first dovetail block (511) is matched with the first dovetail groove (521), and is slidably connected with the first dovetail groove (521); the top surface of the left-right movable adjustment slide (520) is provided with a second dovetail block (522) arranged in the front-back direction, the bottom surface of the front-back movable adjustment slide (530) is provided with a second dovetail groove arranged in the front-back direction, the second dovetail block (522) is matched with the second dovetail groove, and is slidably connected with the second dovetail groove; The direction adjustment device (500) further comprises left and right hydraulic push rods (523) and left and right hydraulic cylinders (524); the left and right hydraulic cylinders (524) are connected to the left and right hydraulic cylinder flanges on the left side or right side of the base (510) through left and right hydraulic connection columns; the left and right hydraulic push rods (523) are connected to the left and right movable adjustment slide (520); the left and right hydraulic cylinders (524) push the left and right movable adjustment slide (520) to move left and right through the left and right hydraulic push rods (523); The direction adjustment device (500) further comprises: a front and rear hydraulic push rod (532) and a front and rear hydraulic cylinder (533); the front and rear hydraulic cylinder (533) is connected to a front and rear hydraulic cylinder flange on a front side or a rear side of a left and right movable adjustment slide seat (520) through a front and rear hydraulic connection column; the front and rear hydraulic push rod (532) is connected to the front and rear movable adjustment slide seat (530); the front and rear hydraulic cylinder (533) pushes the front and rear movable adjustment slide seat (530) to move forward and backward through the front and rear hydraulic push rod (532); The forward and backward movable adjustment slide (540) is arranged on the top surface of the forward and backward movable adjustment slide (530), and comprises a vertical heavy-load hydraulic cylinder (541), upper and lower hydraulic push rods (542), a vertical guide rail (543), a connecting shaft base (544) and a connecting shaft (545); A vertical heavy-load hydraulic cylinder (541) is fixedly connected to the center of the top surface of the front-rear movable adjustment slide (530), and a vertical guide rail (543) is fixedly connected to both sides of the front-rear movable adjustment slide (530). The vertical guide rail (543) is slidably connected to the shaft coupling base (544); The V-shaped block is fixedly connected to the connecting shaft (545), the connecting shaft (545) is rotatably connected to the connecting shaft base (544), the upper and lower hydraulic push rods (542) are connected to the connecting shaft base (544), and the vertical heavy-load hydraulic cylinder (541) pushes the V-shaped block to move up and down through the upper and lower hydraulic push rods (542), the connecting shaft base (544) and the connecting shaft (545).

3. A large-scale pipeline welding alignment device according to claim 2, characterized in that: The pipe clamping device (600) is arranged on the top surface of the V-shaped block and is used to clamp a large pipe. The pipe clamping device (600) comprises a rotary clamping oil cylinder (601) and a pipe clamping block (602). The output shaft of the rotary clamping oil cylinder (601) is connected to the pipe clamping block (602).

4. A large-scale pipeline welding alignment device according to claim 3, characterized in that: The fixed support member (400) comprises a third V-shaped block (553) and a shaft coupling base (544); a shaft coupling (545) is provided on the third V-shaped block (553); the shaft coupling base (544) is fixedly connected to the bottom plate (100); and the third V-shaped block (553) is rotatably connected to the shaft coupling base (544) via the shaft coupling (545).

5. A large-scale pipeline welding alignment device according to claim 4, characterized in that: The first pipeline support module (200) is fixedly connected to the bottom plate (100) via a support block for raising, and the base (510) of the second pipeline support module (300) is fixedly connected to the bottom plate (100), and the heights of the first pipeline support module (200), the second pipeline support module (300) and the fixed support member (400) gradually decrease relative to the bottom plate (100).

6. A large-scale pipeline welding alignment device according to any one of claims 1 to 5, characterized in that: The rotation direction of the V-block is forward and backward.

7. A large pipeline welding alignment method based on a large pipeline welding alignment device according to any one of claims 1 to 6, characterized in that: There are at least two sections of large pipelines to be welded, including a first large pipeline (701) and a second large pipeline (702); Here are the steps: S1: Preparatory steps S1-1: adjusting the pipe clamping blocks (602) of the pipe clamping devices (600) on the first pipe supporting module (200) and the second pipe supporting module (300) to an open state; S1-2: hoisting and placing the first large-scale pipeline (701) on the first V-shaped block (551) of the first pipeline support module (200) and the second V-shaped block (552) of the second pipeline support module (300); S1-3: adjusting the pipe clamping blocks (602) of the pipe clamping devices (600) on the first pipe supporting module (200) and the second pipe supporting module (300) to a closed state; S1-4: adjusting the pipe clamping block (602) of the pipe clamping device (600) to press down linearly and clamp the first large pipe (701); S1-5: hoisting the second large-sized pipeline (702), placing one end of the second large-sized pipeline on the third V-shaped block (553) of the fixed support (400), and placing the rest of the second large-sized pipeline on the ground; S2: Alignment step S2-1: synchronously controlling the forward and backward movement adjustment slides (530) on the first pipe support module (200) and the second pipe support module (300) to adjust the spacing between the sections to be welded of the first large pipe (701) and the second large pipe (702); S2-2: synchronously controlling the left-right movable adjustment slide (520) on the first pipe support module (200) and the second pipe support module (300), or independently controlling the left-right movable adjustment slide (520) on the second pipe support module (300), to adjust the horizontal spacing between the centers of the sections to be welded of the first large pipe (701) and the second large pipe (702); S2-3: synchronously controlling the up-down movable adjustment slide (540) on the first pipe support module (200) and the second pipe support module (300), or independently controlling the up-down movable adjustment slide (540) on the second pipe support module (300), to adjust the vertical spacing between the centers of the cross sections to be welded of the first large pipe (701) and the second large pipe (702); S3: Welding Steps If in step S2, the first large pipe (701) and the second large pipe (702) are welded to a position where the flux can penetrate the welding position, welding is performed; otherwise, the process returns to step S2 to continue alignment and adjustment.

8. The large pipeline welding alignment method according to claim 7, characterized in that: In the S2 alignment step, S2-1, S2-2 and S2-3 are executed with priority given to the one with the largest spacing value to be adjusted at the beginning.

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