An arc welding device and method for buried gas pipeline interfaces

Abstract

The present invention discloses an electric arc welding device and method for buried gas pipeline interfaces, including a central slip ring. Columns are provided on both sides of the central slip ring. A pair of semi-circular clamping rings are respectively provided in front of and behind the central slip ring. Both sides of each pair of clamping rings are connected together through connecting seats. The central slip ring and the clamping rings are connected together through multiple telescopic cylinders capable of universal movement. An arc welding machine is provided in the central slip ring. Compared with the prior art, the present invention provides an efficient, safe and reliable solution for the welding of buried gas pipeline interfaces through the beneficial effects in aspects such as high automation degree, excellent welding quality, strong adaptability, simple operation, high safety, energy conservation and environmental protection.

Description

Technical Field

[0001] The present invention relates to the technical field of arc welding, and in particular to an arc welding device and method for buried gas pipeline interfaces. Background Art

[0002] In gas pipeline projects, the connection quality of interfaces is directly related to the safety and reliability of the entire pipeline system. In the installation and repair of buried gas pipelines, interface welding technology is even more crucial. Existing gas pipeline interface welding equipment usually adopts a fixed welding mechanism and cooperates with manual operation to complete the welding task. Its structural components mainly include a welding power source, a welding gun, a control system, etc. The welding power source provides stable electrical energy for the welding process, the welding gun is responsible for converting electrical energy into heat energy to heat and melt the pipeline interface, and the control system is responsible for adjusting welding parameters to ensure the stable progress of the welding process.

[0003] The welding equipment has many deficiencies in the welding of buried gas pipeline interfaces. The fixed welding mechanism is difficult to adapt to pipeline interfaces with different diameters and angles, which limits the scope of use of the equipment. Moreover, the welding equipment has high requirements for the skills of operators, with large training costs, which is not conducive to improving construction efficiency. In addition, when large pipelines are hoisted and aligned, due to the weight of the pipelines themselves and the limitations of hoisting equipment, it is very difficult to ensure the concentricity of the two pipelines. The deviation of concentricity will directly affect the welding quality and may even lead to welding failure. The existing technology lacks an effective concentricity control mechanism and relies on the experience of operators for fine-tuning, which undoubtedly increases the complexity and uncertainty of the operation. And the size of the interface gap of large pipelines has a direct impact on the welding quality. Too large or too small a gap may result in insecure welding or defects. During the hoisting process, due to the shape, weight of the pipelines and the influence of hoisting equipment, it is very difficult to precisely control the gap size.

[0004] Therefore, it is necessary to provide an arc welding device and method for buried gas pipeline interfaces to achieve fast, accurate and efficient welding operations, overcome the deficiencies of the existing technology, improve the efficiency and quality of gas pipeline interface welding, and provide strong support for the development of modern gas pipeline projects. Summary of the Invention

[0005] To achieve the above object, the present invention provides the following technical solution: An arc welding device for buried gas pipeline interfaces, including a central slip ring, columns are arranged on both sides of the central slip ring, a pair of semi-circular clamping rings are respectively arranged in front of and behind the central slip ring, both sides of each pair of clamping rings are connected together through connecting seats, and the central slip ring and the clamping rings are connected together through a plurality of telescopic cylinders that can move in all directions, and an arc welding machine is arranged in the central slip ring.

[0006] Further, as a preference, a plurality of clamping blocks are provided on the inner wall of the clamping ring. A connecting rod is fixed to the back surface of the clamping block, and the connecting rod is slidably connected to the clamping ring.

[0007] Further, as a preference, each connecting rod in the same clamping ring is connected together through a rotating ring. A plurality of arc-shaped grooves are formed in the rotating ring, and the connecting rod is slidably restricted in the arc-shaped grooves through a sliding pin;

[0008] A clamping rotating handle is fixed in the rotating ring.

[0009] Further, as a preference, ratchet teeth are provided on the outer wall of the rotating ring, and a ratchet pawl is rotatably provided at the edge of the clamping ring. The ratchet pawl can fit into the ratchet teeth on the outer wall of the rotating ring.

[0010] Further, as a preference, a clamping screw rod is rotatably provided in the connecting seat. The two clamping rings in the same pair are threadedly connected to the clamping screw rod in opposite directions;

[0011] The center of the clamping screw rod is connected with a turbine, and a worm meshing with the turbine is rotatably provided in the connecting seat. The worm penetrates outside the connecting seat.

[0012] Further, as a preference, each of the upright columns is connected with a lifting plate in a liftable manner, and the lifting plate is connected with the center sliding ring;

[0013] A lifting screw rod is rotatably provided in the upright column. The lifting screw rod is threadedly connected to the lifting plate, and the top of the lifting screw rod penetrates to the top of the upright column and is connected with a lifting rotating handle.

[0014] Further, as a preference, the lifting plate is rotatably connected to the center sliding ring and can be fastened.

[0015] Further, as a preference, a toothed ring with external teeth is rotatably provided on the inner side wall of the center sliding ring. The arc welding machine is fixed on the inner side wall of the toothed ring;

[0016] A driving gear is rotatably provided on the outer wall of the center sliding ring. The driving gear meshes with the toothed ring, and the driving gear can be driven to rotate by a driving motor;

[0017] The arc welding machine is telescopic.

[0018] Further, as a preference, a plurality of gap clamping strips are distributed on the inner wall of the toothed ring;

[0019] The gap clamping strips are rotatably connected to the toothed ring. Guide blocks are rotatably provided on the front and back surfaces of the center sliding ring corresponding to the inner wall of the toothed ring through torsion springs. Driven blocks are fixed on the front and back surfaces of the gap clamping strips.

[0020] An arc welding method for buried gas pipeline interfaces includes:

[0021] S1. Rotate the lifting and lowering grip. Through the action of the lifting screw rod, adjust the height of the central slip ring so that it reaches the predetermined installation height; if it is necessary to adjust the inclination angle of the central slip ring, loosen the fastening device between the lifting plate and the central slip ring, rotate the central slip ring to the required angle and then fasten it again;

[0022] S2. Push the clamping grip to rotate the rotating ring, change the diameter of the ring formed by the clamping blocks so that it matches the diameter of the pipeline;

[0023] S3. Move the pipeline to the predetermined welding position by a crane, and adjust the angle and position of the pipeline so that it is docked with the welding equipment and another pipeline;

[0024] S4. Align the two pairs of clamping rings with the interfaces of the pipelines at both ends respectively, ensure that the clamping rings are perpendicular to the axis of the corresponding pipelines, rotate the worm gear and through the action of the clamping screw rod, make the two clamping rings of the same pair move towards the pipeline direction simultaneously until the pipeline is clamped;

[0025] S5. Slowly adjust the telescopic length of each telescopic cylinder to be the same by applying pressure. At this time, the pipeline is concentric with the central slip ring. Subsequently, shortening the length of the telescopic cylinder can make the ends of the two pipelines fit towards the central slip ring;

[0026] S6. Fit the ends of the two pipelines into the gap clamping strip so that the gap width between the two pipelines is the width of the gap clamping strip;

[0027] S7. Adjust the telescopic length of the arc welding machine as needed to adapt to pipelines of different diameters; start the driving motor to make the arc welding machine rotate along the inner wall of the central slip ring. When the gear ring rotates clockwise and the driven block passes through the guiding block, the gap clamping strip tilts and leaves the joint of the pipeline to avoid contacting the molten pool after the pipeline is welded by the arc welding machine.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] In the present invention, the clamping blocks on the inner wall of the clamping ring are designed so that the equipment can adapt to pipelines of different diameters, while the lifting plate and the angle adjustment device enable the equipment to handle pipelines of different heights and inclination angles. Through simple rotation and pressing operations, functions such as the lifting, angle adjustment, pipeline clamping and welding of the equipment can be achieved.

[0030] In the present invention, through the automatic adjustment of the telescopic cylinder, this equipment can quickly and accurately clamp the pipeline and align the pipeline concentrically with the central slip ring. This process does not require manual intervention, greatly reducing the operation difficulty and labor intensity and improving the work efficiency. The built-in arc welding machine in the equipment can rotate evenly along the inner wall of the central slip ring to achieve continuous and uniform welding of the pipeline. At the same time, the design of the gap clamping strip ensures that the gap width of the pipeline interface is consistent, avoiding the generation of welding defects and ensuring the welding quality. Brief Description of the Drawings

[0031] Figure 1 It is a three - dimensional structure schematic diagram of an electric arc welding device for buried gas pipeline interfaces;

[0032] Figure 2 It is a top view of an electric arc welding device for buried gas pipeline interfaces;

[0033] Figure 3 It is a structure schematic diagram of a clamping ring;

[0034] Figure 4 It is a structure schematic diagram of a central sliding ring;

[0035] Figure 5 It is a structure schematic diagram of a gap clamping strip;

[0036] In the figure: 1. Central sliding ring; 2. Column; 21. Lifting plate; 22. Lifting rotating handle; 23. Lifting screw rod; 3. Clamping ring; 31. Connecting seat; 32. Worm; 33. Clamping screw rod; 34. Turbine; 4. Telescopic cylinder; 5. Electric arc welder; 6. Clamping block; 61. Connecting rod; 7. Rotating ring; 71. Arc - shaped groove; 72. Clamping rotating handle; 73. Pawl; 8. Gear ring; 81. Gap clamping strip; 82. Guide block; 83. Driven block; 9. Driving motor; 91. Driving gear. Detailed Embodiment

[0037] Please refer to Figure 1 and Figure 2 In an embodiment of the present invention, an electric arc welding device for buried gas pipeline interfaces includes a central sliding ring 1. On both sides of the central sliding ring 1, there are columns 2. In front of and behind the central sliding ring 1, there are respectively a pair of semi - circular clamping rings 3. Both sides of each pair of clamping rings 3 are connected together through a connecting seat 31. The central sliding ring 1 and the clamping rings 3 are connected together through a plurality of telescopic cylinders 4 that can move in all directions. An electric arc welder 5 is provided in the central sliding ring 1.

[0038] When the telescopic cylinder 4 is in a pressure - relief state, the two groups of clamping rings 3 can move in multiple directions, so as to clamp the end side walls of two pipes. After clamping the pipes, the telescopic length of each telescopic cylinder 4 is slowly adjusted to be the same by pressurization. At this time, the pipes are concentric with the central sliding ring 1. Subsequently, shortening the length of the telescopic cylinder 4 can make the ends of the two pipes fit towards the central sliding ring 1, so as to weld the interfaces of the two pipes through the electric arc welder 5.

[0039] In this embodiment, a plurality of clamping blocks 6 are provided on the inner wall of the clamping ring 3. A connecting rod 61 is fixed on the back of the clamping block 6, and the connecting rod 61 is slidably connected to the clamping ring 3. By sliding the connecting rod 61, the diameter of the ring formed by the plurality of clamping blocks 6 can be changed, so that the clamping ring 3 can clamp pipes with different diameters.

[0040] Please refer to Figure 3 , in this embodiment, each connecting rod 61 in the same clamping ring 3 is connected together through a swivel ring 7. A plurality of arc-shaped grooves 71 are formed in the swivel ring 7, and the connecting rod 61 is slidably restricted in the arc-shaped groove 71 through a sliding pin;

[0041] A clamping turning handle 72 is fixed in the swivel ring 7.

[0042] That is to say, by pushing the clamping turning handle 72 to rotate the swivel ring 7 to change the contact position between the arc-shaped groove 71 and the connecting rod 61, each connecting rod 61 in the same clamping ring 3 can be pushed to synchronously expand and contract, so as to quickly change the diameter of the ring formed by the clamping blocks 6.

[0043] In this embodiment, ratchet teeth are formed on the outer wall of the swivel ring 7, and a ratchet pawl 73 is rotatably provided at the edge of the clamping ring 3. The ratchet pawl 73 can fit into the ratchet teeth on the outer wall of the swivel ring 7. That is to say, the swivel ring 7 can only rotate in one direction, so that the diameter of the ring formed by the clamping blocks 6 can be quickly reduced, and cannot be enlarged under the action of an external force, thereby playing a clamping role.

[0044] In this embodiment, a clamping screw 33 is rotatably provided in the connecting seat 31. The two clamping rings 3 in the same pair are threadedly connected to the clamping screw 33 in the opposite direction;

[0045] The center of the clamping screw 33 is connected with a turbine 34, and a worm 32 meshing with the turbine 34 is rotatably provided in the connecting seat 31. The worm 32 penetrates outside the connecting seat 31.

[0046] By rotating the worm 32, the two clamping rings 3 in the same pair can be clamped or separated.

[0047] Please refer to Figure 4 , in this embodiment, each column 2 is connected with a lifting plate 21 in a liftable manner, and the lifting plate 21 is connected with the central sliding ring 1;

[0048] A lifting screw 23 is rotatably provided in the column 2. The lifting screw 23 is threadedly connected with the lifting plate 21. The top of the lifting screw 23 penetrates through the top of the column 2 and is connected with a lifting turning handle 22.

[0049] By rotating the lifting turning handle 22, the height of the central sliding ring 1 can be adjusted to adapt to pipes installed at different heights.

[0050] In this embodiment, the lifting plate 21 is rotatably connected with the central sliding ring 1 and can be fastened. By rotating the central sliding ring 1, the inclination angle of the central sliding ring can be changed to adapt to pipes with an inclined slope.

[0051] In this embodiment, a toothed ring 8 with external teeth is rotatably provided on the inner side wall of the central slip ring 1, and the arc welding machine 5 is fixed on the inner side wall of the toothed ring 8;

[0052] A driving gear 91 is rotatably provided on the outer wall of the central slip ring 1, the driving gear 91 meshes with the toothed ring 8, and the driving gear 91 can be driven to rotate by a driving motor 9.

[0053] By means of the driving motor 9, the arc welding machine 5 can be rotated one circle along the inner wall of the central slip ring 1, so as to evenly weld the seams of the two pipes fitted to the central slip ring 1.

[0054] In this embodiment, the arc welding machine 5 is telescopic to change its length so as to adapt to pipes with different diameters.

[0055] In this embodiment, a plurality of gap clamping strips 81 are distributed on the inner wall of the toothed ring 8. When the ends of the two pipes are fitted to the central slip ring 1, the gap clamping strips 81 are located between the seams of the two pipes, so that the seam width of the pipes is appropriate, avoiding too wide or too narrow seams to reduce the welding quality.

[0056] Please refer to Figure 4 , in this embodiment, the gap clamping strips 81 are rotatably connected to the toothed ring 8, and guiding blocks 82 are rotatably provided on the front and rear surfaces of the central slip ring 1 corresponding to the inner wall of the toothed ring 8 through torsion springs, and driven blocks 83 are fixed on the front and rear surfaces of the gap clamping strips 81.

[0057] The gap clamping strips 81 can rotate between facing the center of the central slip ring 1 and tilting to a certain angle. When the toothed ring 8 rotates clockwise and the driven block 83 passes through the guiding block 82, the gap clamping strips 81 tilt and leave the seam of the pipe, avoiding contacting the molten pool after welding by the arc welding machine 5. When the toothed ring 8 rotates counterclockwise and the driven block 83 passes through the guiding block 82, the gap clamping strips 81 rotate back towards the center of the central slip ring 1;

[0058] The gap clamping strips 81 in this embodiment are made of graphite material and have a good self-lubricating effect, ensuring that they can slide smoothly in the pipe gap.

[0059] An arc welding method for buried gas pipeline interfaces includes:

[0060] S1. Rotate the lifting and turning handle 22, and adjust the height of the central slip ring 1 through the action of the lifting screw 23 to reach the predetermined installation height; if it is necessary to adjust the inclination angle of the central slip ring, the fastening device between the lifting plate 21 and the central slip ring 1 can be loosened, and the central slip ring 1 can be rotated to the required angle and then fastened again;

[0061] S2. Rotate the rotating ring 7 by pushing the clamping and turning handle 72 to change the diameter of the ring formed by the clamping blocks 6 to match the diameter of the pipe;

[0062] S3. Move the pipeline to the predetermined welding position by a crane, and adjust the angle and position of the pipeline so that it is docked with the welding equipment and another pipeline;

[0063] S4. Align the two pairs of clamping rings 3 with the interfaces of the pipelines at both ends respectively, ensure that the clamping rings 3 are perpendicular to the axis of the corresponding pipelines, and rotate the worm 32 and the clamping screw 33 so that the two clamping rings 3 of the same pair move towards the pipeline direction simultaneously until the pipeline is clamped;

[0064] S5. Slowly adjust the telescopic length of each telescopic cylinder 4 to be the same by pressurization. At this time, the pipeline is concentric with the central sliding ring 1. Subsequently, shortening the length of the telescopic cylinder 4 can make the ends of the two pipelines fit towards the central sliding ring 1;

[0065] S6. The ends of the two pipelines fit into the gap strip 81 so that the gap width between the two pipelines is the width of the gap strip 81;

[0066] S7. Adjust the telescopic length of the arc welding machine 5 as needed to adapt to pipelines with different diameters; start the drive motor 9 to make the arc welding machine 5 rotate along the inner wall of the central sliding ring 1. When the gear ring 8 rotates clockwise and the driven block 83 passes through the guide block 82, the gap strip 81 tilts and leaves the joint of the pipeline to avoid contacting the molten pool after welding by the arc welding machine 5.

[0067] In addition, observe whether the arc welding machine 5 welds the joints of the two pipelines evenly during the welding process, pay attention to observing the welding quality, and ensure that the weld is flat and free of defects such as pores and slag inclusions;

[0068] After welding, rotate the worm 32 to release all the clamping rings 3 from the pipeline, move the central sliding ring 1 to the next welding point, and start the drive motor 9 to reset the arc welding machine 5. When the gear ring 8 rotates counterclockwise and the driven block 83 passes through the guide block 82, the gap strip 81 rotates back towards the center of the central sliding ring 1.

[0069] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. An arc welding device for a buried gas pipeline interface, comprising a center slip ring (1), characterized in that: The central slip ring (1) is provided with uprights (2) on both sides, and a pair of semicircular clamping rings (3) are provided at the front and rear of the central slip ring (1), respectively. Both sides of each pair of clamping rings (3) are connected together via a connecting seat (31), and the central slip ring (1) and the clamping rings (3) are connected together via a plurality of telescopic cylinders (4) capable of universal movement, and an arc welding machine (5) is provided in the central slip ring (1); The inner wall of the clamp ring (3) is provided with a plurality of clamp blocks (6), a connecting rod (61) is fixed to the back of the clamp block (6), and the connecting rod (61) is slidably connected to the clamp ring (3); Each connecting rod (61) in the same clamp ring (3) is connected together via a rotating ring (7), a plurality of arc grooves (71) are provided in the rotating ring (7), the connecting rod (61) is slidably restricted in the arc grooves (71) via sliding pins, and a clamping handle (72) is fixed in the rotating ring (7); The outer wall of the rotating ring (7) is provided with ratchet teeth, and the edge of the clamping ring (3) is rotatably provided with a ratchet pawl (73), and the ratchet pawl (73) can fit into the ratchet teeth on the outer wall of the rotating ring (7); The inner side wall of the center slip ring (1) is rotatably provided with a gear ring (8) having external teeth, and the arc welding machine (5) is fixed to the inner side wall of the gear ring (8); A driving gear (91) is rotatably provided on the outer wall of the central slip ring (1), the driving gear (91) being meshed with the ring gear (8), and the driving gear (91) can be driven to rotate by a driving motor (9); The arc welding machine (5) is retractable; The inner wall of the gear ring (8) is distributed with a plurality of gap clamping strips (81); The slit clamping strip (81) is rotatably connected to the gear ring (8); the front and rear surfaces of the center slip ring (1) corresponding to the inner wall of the gear ring (8) are rotatably provided with guide blocks (82) via torsion springs; and the front and rear surfaces of the slit clamping strip (81) are fixed with driven blocks (83).

2. The arc welding equipment for concealed gas pipeline interface according to claim 1 is characterized in that: A clamping screw (33) is rotatably provided in the connection seat (31), and the two clamping rings (3) of the same pair are connected to the clamping screw (33) via reverse threads; The center of the clamping screw (33) is connected to a worm wheel (34), and a worm (32) meshing with the worm wheel (34) is rotatably provided in the connecting seat (31), and the worm (32) extends to the outside of the connecting seat (31).

3. The arc welding equipment for concealed gas pipeline interface according to claim 2 is characterized in that: Each of the uprights (2) is liftably connected to a lifting plate (21), and the lifting plate (21) is connected to a central slip ring (1); A lifting screw (23) is rotatably provided in the column (2), the lifting screw (23) is threadedly connected to the lifting plate (21), and the top of the lifting screw (23) penetrates the top of the column (2) and is connected to the lifting handle (22).

4. The arc welding equipment for concealed gas pipeline interface according to claim 3 is characterized in that: The lifting plate (21) is rotatably connected to the central slip ring (1) and can be fastened.

5. A method for arc welding a concealed gas pipeline interface, using an arc welding device for concealed gas pipeline interface according to claim 4, characterized in that: include: S1. Turn the lifting handle (22) to adjust the height of the center slip ring (1) through the action of the lifting screw (23) so that it reaches a predetermined installation height; if the tilt angle of the center slip ring needs to be adjusted, loosen the fastening device between the lifting plate (21) and the center slip ring (1), turn the center slip ring (1) to the desired angle, and then re-tighten it; S2, by pushing the clamping handle (72) to rotate the rotating ring (7), the diameter of the ring formed by the clamping block (6) is changed to match the diameter of the pipe; S3, move the pipeline to the predetermined welding position by means of a crane, and adjust the angle and position of the pipeline so that it can be butted with the welding equipment and another pipeline; S4, align the two pairs of clamping rings (3) with the interfaces of the pipes at both ends respectively, ensure that the clamping rings (3) are perpendicular to the axis of the corresponding pipes, rotate the worm (32), and the clamping screw (33) to make the two clamping rings (3) of the same pair move towards the pipe at the same time until the pipes are clamped; S5. Slowly adjust the telescopic length of each telescopic cylinder (4) to be consistent by applying pressure, so that the pipeline is concentric with the center slip ring (1), and then shorten the length of the telescopic cylinder (4) to fit the ends of the two pipelines to the center slip ring (1); S6, the ends of the two pipes are fitted into the gap clamping strip (81), so that the width of the gap between the two pipes is the width of the gap clamping strip (81); S7. Adjust the telescopic length of the arc welder (5) as required to adapt to pipes of different diameters; start the drive motor (9) to rotate the arc welder (5) along the inner wall of the center slip ring (1); when the gear ring (8) rotates the driven block (83) clockwise through the guide block (82), the gap clamping strip (81) tilts and leaves the joint of the pipe to avoid contact with the molten pool after welding by the arc welder (5).

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