Pipeline inner support welding tool and welding method thereof

Abstract

The invention belongs to the field of auxiliary tools for pipeline welding, and particularly relates to a pipeline inner support welding tool which is of a cylindrical strip-shaped structure, the two ends of the welding tool are each provided with a supporting end abutting against the inner wall of a pipeline in a supporting mode, and the supporting ends are connected through a connecting part to form an integral structure. The supporting end is connected with the connecting part by means of a push-pull telescopic cylinder, a supporting leg rod is arranged on the supporting end, and the supporting end and the inner wall of the pipeline form abutting limiting by means of the supporting leg rod, and the invention further discloses a welding method based on the welding tool. The welding tool is supported in a pipeline, the pipe ends on the two sides of a welding gap are fixed through the supporting ends, the pipe ends are pulled close by means of the push-pull telescopic cylinder, the two sides of the pipe ends are aligned during welding, internal equipment does not need to be avoided during welding, and the welding efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of auxiliary tooling for pipeline welding, specifically relating to a pipeline internal support welding tooling and its welding method. Background Technology

[0002] Buried pipelines and large-diameter pipelines are widely used in fields such as oil, natural gas, water supply and drainage, and industrial fluid transportation. During the laying process, multiple pipe sections need to be welded together to form a complete pipeline. The quality of welding directly determines the sealing performance, structural strength, and service life of the pipeline system. Once deformation, misalignment, or leakage occurs after welding, the cost of subsequent maintenance is extremely high, and it may also cause environmental pollution and waste of raw materials.

[0003] Currently, the main welding auxiliary tooling used is divided into external pipe support tooling and internal pipe support tooling. External pipe support tooling is usually a bracket with rollers, which supports the pipe and aligns the two pipe sections. However, the alignment effect is limited by the collapse of the insulation or protective layer covering the pipe. Internal pipe support, such as using inflatable airbags pre-inserted into the pipe, requires manual assistance to push the two pipe sections into place before inflation. The airbags fill the cavities on both sides to align the misaligned pipe sections. However, this method requires protection of the airbag sidewalls during subsequent welding to prevent burn damage. Furthermore, the preliminary preparation work requires manual assistance for pipe beveling and pipe movement, resulting in low efficiency. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a pipe internal support welding fixture and its welding method, which can achieve pipe body alignment on both sides of the weld gap, providing favorable conditions for welding.

[0005] The specific technical solution adopted in this invention is: a welding fixture for supporting the pipeline, the welding fixture having a cylindrical strip structure, with support ends at both ends of the welding fixture respectively providing support against the inner wall of the pipeline, the support ends being connected to each other to form an integral structure by means of a connecting part, the support ends being connected to the connecting part by means of a push-pull telescopic cylinder, the support ends being provided with support legs, and the support ends forming abutment and limiting with the inner wall of the pipeline by means of the support legs.

[0006] The supporting end has a barrel-shaped structure, including an outer ring and a limiting groove plate fixed to the inner wall of the outer ring. The limiting groove plates are arranged in a circular array inside the outer ring. One end of the limiting groove plate is fixedly connected to a disc-shaped limiting cover. The limiting groove plate forms a barrel-shaped structure around the edge of the limiting cover. A push-pull groove plate is provided on the inner side of the limiting groove plate. A protruding slide rail is provided on the back of the push-pull groove plate. The limiting groove plate is provided with a concave slide groove. The slide rail and the slide groove fit together, allowing the push-pull groove plate to slide freely relative to the limiting groove plate.

[0007] One end of the push-pull groove plate is provided with a disc-shaped push-pull plate, and the push-pull groove plate surrounds the edge of the push-pull plate to form a barrel-shaped structure.

[0008] The support leg and the swing hole opened on the limiting groove plate form a fitting together. The swing hole has a flat, trumpet-shaped structure, and the support leg has the freedom to swing left and right relative to the swing hole.

[0009] The end of the support leg passes through the swing hole and abuts against the back of the push-pull groove plate. The back of the push-pull groove plate is provided with a wave-shaped drive groove. The end of the support leg is inserted into the drive groove. The drive groove moves the support leg as the push-pull groove plate moves.

[0010] The connecting part has a cylindrical structure. The push-pull telescopic cylinder is inserted into the cylindrical cavity of the connecting part and a set is provided at both ends of the connecting part. The telescopic end of the push-pull telescopic cylinder is connected to the push-pull column provided in the middle of the push-pull plate. The push-pull groove plate slides back and forth relative to the limiting groove plate by means of the telescopic movement of the push-pull telescopic cylinder. A connecting rod is also provided between the connecting part and the outer ring. The outer ring wall of the outer ring is provided with a through hole for the support leg rod to pass through.

[0011] The limiting cover is also equipped with a traveling wheel. The traveling wheel is connected to the limiting cover by a quadrilateral linkage mechanism to swing. One side of the quadrilateral linkage mechanism is also connected to a support telescopic cylinder. At least three sets of traveling wheels are arranged at equal intervals around the limiting cover.

[0012] A grinding assembly is also provided on the outer side of the cylinder wall of the connecting part. The grinding assembly includes a rotating ring and a bevel grinding head. The rotating ring has a rotational degree of freedom to rotate around the connecting part. The bevel grinding head is provided with a grinding groove that is concave into an annular groove. The bevel grinding head is clamped in the welding gap and rotated by means of a grinding motor. The grinding motor is mounted on the grinding base plate. The grinding base plate is oscillatingly connected to the rotating ring by means of a pitch seat.

[0013] The welding method of the present invention includes the following steps: S1. The pipe body to be welded is hoisted to the welding position of the pipeline, and a welding gap is formed between the pipeline and the pipe body to be welded; S2. Using the wheels, the welding fixture is passed through the pipe and moved to the weld seam. The support end of the welding fixture extends from the end of the pipe and is inserted into the pipe on the other side of the weld seam. S3. The push-pull telescopic cylinders on both sides retract synchronously, and the support ends form an expansion connection with the pipe wall and the pipe body respectively. With the help of welding fixtures, the pipe and the pipe body on both sides of the weld gap are aligned. The push-pull telescopic cylinders continue to retract to align the pipe ends on both sides of the weld gap. Then the push-pull telescopic cylinders extend to release the pipe wall. With the help of the traveling wheels, the middle of the connection part is located at the weld gap. S4. Continue to extend the push-pull telescopic cylinder to separate the pipe body to be welded from the pipeline and re-form the welding gap. After the width of the welding gap reaches the design requirements, welding is carried out.

[0014] In step S4, after the pipe body to be welded is separated from the pipeline, the push-pull telescopic cylinder continues to extend, so that the bevel grinding column can be lifted from the pipe cavity to the welding gap. Then the push-pull telescopic cylinder retracts, clamping the bevel grinding column in the welding gap. The bevel grinding column rotates and grinds in the welding gap with the help of the rotating ring to form the bevel at the pipe end. After grinding is completed, the welding gap is reopened. After the bevel grinding column is lowered, steps S3 and S4 are repeated to complete the welding.

[0015] The beneficial effects of this invention are: The welding fixture of the present invention is supported inside the pipe. The pipe ends on both sides of the welding gap are fixed by the support end and the pipe ends are pulled closer by the push-pull telescopic cylinder, so that the two sides of the pipe ends are aligned during welding and there is no need to avoid the internal equipment during welding, thus improving welding efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of welding fixtures inside a pipe. Figure 3 This is a schematic diagram of the interior of the support end; Figure 4 for Figure 3 Enlarged schematic diagram of part B; Figure 5 This is a schematic diagram showing the support rod abutting against the inner wall of the pipe. Figure 6 for Figure 1 An enlarged schematic diagram of part A in the middle; In the attached diagram, 1 is the connecting part, 2 is the push-pull telescopic cylinder, 3 is the support leg, 4 is the outer ring, 5 is the limiting groove plate, 6 is the limiting cover, 7 is the push-pull groove plate, 8 is the slide rail, 9 is the slide groove, 10 is the push-pull plate, 11 is the swing hole, 12 is the drive groove, 13 is the push-pull column, 14 is the connecting rod, 15 is the traveling wheel, 16 is the support telescopic cylinder, 17 is the rotating ring, 18 is the beveled grinding column head, 19 is the grinding motor, 20 is the grinding base plate, and 21 is the pitch seat. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Specific implementation examples Figure 1 and Figure 2 As shown, the present invention is a welding fixture for internal support of a pipeline. The welding fixture has a cylindrical strip structure. Both ends of the welding fixture are respectively provided with support ends that abut against the inner wall of the pipeline. The support ends are connected to each other by a connecting part 1 to form an integral structure. The support ends and the connecting part 1 are connected by a push-pull telescopic cylinder 2. The support ends are provided with support legs 3, and the support ends abut against the inner wall of the pipeline by means of the support legs 3.

[0018] The present invention is as follows Figure 2 and Figure 1 As shown, the welding fixture is supported inside the pipe during use. The welding fixture is expanded into the pipe on both sides of the weld gap. By pushing and pulling the telescopic cylinder 2, the width of the weld gap meets the requirements and the two ends of the pipe are aligned, thereby providing positioning and support for subsequent welding operations and ensuring the high-quality completion of pipe welding.

[0019] Furthermore, such as Figure 1 As shown, the support end has a barrel-shaped structure including an outer ring 4 and a limiting groove plate 5 fixed to the inner wall of the outer ring 4. The limiting groove plate 5 is arranged in a circular array inside the outer ring 4. One end of the limiting groove plate 5 is fixedly connected to a disc-shaped limiting cover 6. The limiting groove plate 5 surrounds the edge of the limiting cover 6 to form a barrel-shaped structure. A push-pull groove plate 7 is provided on the inner side of the limiting groove plate 5. A protruding slide rail 8 is provided on the back of the push-pull groove plate 7. The limiting groove plate 5 is provided with a concave slide groove 9. The slide rail 8 and the slide groove 9 fit together, so that the push-pull groove plate 7 has the freedom to slide relative to the limiting groove plate 5.

[0020] like Figure 1 and Figure 3As shown, the support end of the present invention is barrel-shaped, wherein the outer ring 4 is connected to the limiting groove plate 5, and the bottom of the limiting groove plate 5 is also connected to the limiting cover 6. The limiting cover 6 connects the limiting groove plate 5 to form an outer barrel, wherein the outer ring 4 is fitted as a reinforcing ring on the cylindrical wall formed by the limiting groove plate 5, and the push-pull groove plate 7 forms an inner barrel by means of the push-pull plate 10, that is, one end of the push-pull groove plate 7 is provided with a disc-shaped push-pull plate 10, and the push-pull groove plate 7 surrounds the edge of the push-pull plate 10 to form a barrel-shaped structure.

[0021] Thus, by means of the relative movement between the inner and outer tubs, the support legs 3 embedded in the outer tub are driven.

[0022] Specifically, such as Figure 3 , Figure 4 , Figure 5 As shown, the support leg 3 and the swing hole 11 on the limiting groove plate 5 are fitted together. The swing hole 11 has a flat flared structure, and the support leg 3 has the freedom to swing left and right relative to the swing hole 11.

[0023] The swing hole 11 has a fan-shaped structure, with the side closer to the push-pull groove plate 7 being the small hole side and the side away from the push-pull groove plate 7 being the long hole side. The support rod 3 is as follows... Figure 4 As shown, the side of the push-pull groove plate 7 is set with a necked structure, so as to form a nested fit with the small hole side of the swing hole 11, and make the support leg 3 and the swing hole 11 have relative swing freedom.

[0024] Furthermore, such as Figure 5 As shown, the end of the support rod 3 passes through the swing hole 11 and abuts against the back of the push-pull groove plate 7. The back of the push-pull groove plate 7 is provided with a wave-shaped drive groove 12. The end of the support rod 3 is inserted into the drive groove 12. The drive groove 12 moves the support rod 3 as the push-pull groove plate 7 moves.

[0025] Figure 5 The limiting groove plate 5 is omitted, leaving only a set of support legs 3 that mate with the wave-shaped drive groove 12. Since the drive groove 12 is wave-shaped, and each set of support legs 3 is positioned between two wave crests, with the support legs 3 arranged in pairs, when the support legs 3 are located at a wave trough, as... Figure 6 The solid lines indicate that the two sets of support legs 3 are now spread outwards. Figure 6 The free end of the upper part of the middle support rod 3 is separated from the inner wall of the pipe. When the push-pull groove plate 7 moves outward or inward relative to the limiting groove plate 5, the support rod 3 will be located on the upper slope of the wave-shaped structure of the drive groove 12, thereby swinging the support rod 3 inward. Figure 6As shown by the dotted line, the two sets of support legs 3 close inward by swinging the support legs 3, and the free end of the support legs 3 abuts against the inner wall of the pipe, thereby forming a support limit, so that the support end abuts against the side wall of the pipe.

[0026] By using the wave-shaped arrangement of the drive groove 12 and the support rods 3 set between each set of wave crests, multiple sets of support rods 3 are set along the extension direction of the drive groove 12. Regardless of whether the drive groove 12 moves outward or inward, it can trigger the abutment limit of the support rods 3. This allows the single-function push-pull telescopic cylinder 2 to complete the locking and pulling operations of the support end, which helps to reduce equipment cost and maintenance difficulty.

[0027] Once the support end reaches the limit position, the push-pull telescopic cylinder 2 continues to push and pull, causing the support end and the pipe on that side to move towards the pipe on the other side, thereby adjusting the width of the weld gap. At this time, the pipe to be welded and installed later is placed on the support roller or on the piled-up earth platform. By fixing the support end and pushing and pulling the push-pull telescopic cylinder 2, further fine adjustment of the weld is achieved, avoiding the inconvenience caused by direct operation by personnel.

[0028] Furthermore, such as Figure 1 and Figure 6 As shown, the connecting part 1 has a cylindrical structure. The push-pull telescopic cylinder 2 is inserted into the cylindrical cavity of the connecting part 1, and a set is respectively provided at both ends of the connecting part 1. The telescopic end of the push-pull telescopic cylinder 2 is connected to the push-pull column 13 provided in the middle of the push-pull plate 10. The push-pull groove plate 7 slides back and forth relative to the limiting groove plate 5 by means of the telescopic movement of the push-pull telescopic cylinder 2. A connecting rod 14 is also provided between the connecting part 1 and the outer ring 4. The outer ring 4 has a through hole for the support leg 3 to pass through, and the outer ring avoids the movement of the support leg 3 by means of the through hole. The connecting rod 14 of the present invention is supported on the outer barrel and is specifically connected to the end of the limiting groove plate 5, so that the inner barrel can move back and forth relative to the outer barrel.

[0029] Furthermore, such as Figure 1 As shown, the limiting cover 6 is also provided with a traveling wheel 15. The traveling wheel 15 is connected to the limiting cover 6 by means of a quadrilateral linkage mechanism to form a swing connection. One side of the quadrilateral linkage mechanism is also connected to a support telescopic cylinder 16. At least three sets of traveling wheels 15 are arranged at equal intervals around the limiting cover 6.

[0030] The traveling wheel 15 of this invention is connected to a traveling motor, enabling the traveling wheel 15 to move the welding fixture along the radial direction of the pipe. The traveling wheel 15 is connected to the welding fixture via a quadrilateral linkage mechanism. When movement is required, it extends with the aid of a support telescopic cylinder 16. Figure 1As shown, the end where the traveling wheel 15 and the traveling motor are located is brought close to the inner wall of the pipe, and the welding fixture is moved by means of the traveling wheel 15 after contact.

[0031] Furthermore, a grinding assembly is provided on the outer side of the cylinder wall of the connecting part 1. The grinding assembly includes a rotating ring 17 and a bevel grinding head 18. The rotating ring 17 has a rotational degree of freedom to rotate around the connecting part 1. The bevel grinding head 18 is provided with a grinding groove that is recessed into an annular groove. The bevel grinding head 18 is clamped in the welding gap and rotated by means of a grinding motor 19. The grinding motor 19 is mounted on the grinding base plate 20. The grinding base plate 20 is connected to the rotating ring 17 by means of a pitch seat 21. The rotating ring 17 of the present invention has teeth arranged in a ring around its circumference. A drive motor is provided on the cylindrical wall of the connecting part 1. The drive motor drives the rotating ring 17 to rotate by means of the teeth. A pitch motor is provided on the pitch seat 21. The grinding base plate 20 is hinged to the pitch seat 21 by means of a hinge shaft. The pitch motor is driven by the hinge shaft. The pitch motor enables the grinding base plate 20 to pitch and rotate, so that the grinding column head can be raised into the weld gap or parallel to the axis of the connecting part 1.

[0032] The present invention also includes a grinding component. Before adjusting the weld gap, the pipes on both sides are pushed and pulled to clamp the bevel grinding head 18 inside the weld gap. The grinding head is driven to rotate by the grinding motor 19, so that the pipe end is ground to form a weld bevel. In conjunction with the push-pull telescopic cylinder 2, the pipes on both sides are aligned and pulled, so that there is greater pressure at the weld gap. With the bevel grinding head 18, the bevel grinding can be completed quickly, shortening the welding preparation time.

[0033] The welding method of the present invention includes the following steps: S1. The pipe body to be welded is hoisted to the welding position of the pipeline, and a welding gap is formed between the pipeline and the pipe body to be welded; S2. Using the walking wheels 15, the welding fixture is passed through the pipe body and moved to the welding gap. The support end of one side of the welding fixture extends out from the end of the pipe body and is inserted into the pipe on the other side of the welding gap. S3. The push-pull telescopic cylinders 2 on both sides retract synchronously, and the support ends form an expansion connection with the pipe wall and the pipe body respectively. With the help of welding fixtures, the pipe and the pipe body on both sides of the weld gap are aligned. The push-pull telescopic cylinders 2 continue to retract, aligning the pipe ends on both sides of the weld gap. Then the push-pull telescopic cylinders 2 extend, releasing the pipe wall. With the help of the traveling wheels 15, the middle part of the connection part 1 is located at the weld gap. S4. Continue to extend the push-pull telescopic cylinder 2 to separate the pipe body to be welded from the pipeline and re-form the welding gap. After the width of the welding gap reaches the design requirements, welding is carried out.

[0034] In step S4, after the pipe body to be welded is separated from the pipeline, the push-pull telescopic cylinder 2 continues to extend, so that the bevel grinding head 18 can be lifted from the pipe cavity to the welding gap. Then the push-pull telescopic cylinder 2 retracts, clamping the bevel grinding head 18 in the welding gap. The bevel grinding head 18 rotates and grinds in the welding gap with the help of the rotating ring 17 to form the bevel at the pipe end. After grinding is completed, the welding gap is reopened. After the bevel grinding head 18 is lowered, steps S3 and S4 are repeated to complete the welding.

Claims

1. A welding fixture for supporting a pipe, wherein the welding fixture is a cylindrical strip structure, and both ends of the welding fixture are respectively provided with support ends that abut against the inner wall of the pipe, and the support ends are connected by a connecting part (1) to form an integral structure, characterized in that: The support end and the connecting part (1) are connected by a push-pull telescopic cylinder (2). The support end is provided with a support rod (3), and the support end forms an abutment limit with the inner wall of the pipe by means of the support rod (3).

2. The pipe internal support welding fixture according to claim 1, characterized in that: The support end has a barrel-shaped structure including an outer ring (4) and a limiting groove plate (5) fixed to the inner wall of the outer ring (4). The limiting groove plate (5) is arranged in a circular array inside the outer ring (4). One end of the limiting groove plate (5) is fixedly connected to a disc-shaped limiting cover (6). The limiting groove plate (5) surrounds the edge of the limiting cover (6) to form a barrel-shaped structure. A push-pull groove plate (7) is provided on the inner side of the limiting groove plate (5). A protruding slide rail (8) is provided on the back of the push-pull groove plate (7). The limiting groove plate (5) is provided with a concave slide groove (9). The slide rail (8) and the slide groove (9) fit together so that the push-pull groove plate (7) has the freedom to slide relative to the limiting groove plate (5).

3. The pipe internal support welding fixture according to claim 2, characterized in that: One end of the push-pull groove plate (7) is provided with a disc-shaped push-pull plate (10), and the push-pull groove plate (7) surrounds the edge of the push-pull plate (10) to form a barrel-shaped structure.

4. The pipe internal support welding fixture according to claim 2, characterized in that: The support rod (3) and the swing hole (11) on the limiting groove plate (5) are fitted together. The swing hole (11) has a flat flared structure. The support rod (3) has the freedom to swing left and right relative to the swing hole (11).

5. The pipe internal support welding fixture according to claim 4, characterized in that: The end of the support rod (3) passes through the swing hole (11) and abuts against the back of the push-pull groove plate (7). The back of the push-pull groove plate (7) is provided with a wave-shaped drive groove (12). The end of the support rod (3) is inserted into the drive groove (12). The drive groove (12) moves the support rod (3) as the push-pull groove plate (7) moves.

6. The pipe internal support welding fixture according to claim 2, characterized in that: The connecting part (1) has a cylindrical structure. The push-pull telescopic cylinder (2) is inserted into the cylindrical cavity of the connecting part (1) and a set is provided at both ends of the connecting part (1). The telescopic end of the push-pull telescopic cylinder (2) is connected to the push-pull column (13) provided in the middle of the push-pull plate (10). The push-pull groove plate (7) slides back and forth relative to the limiting groove plate (5) by means of the telescopic movement of the push-pull telescopic cylinder (2). A connecting rod (14) is also provided between the connecting part (1) and the outer ring (4). The outer ring wall of the outer ring (4) is provided with a through hole for the support leg rod (3) to pass through.

7. The pipe internal support welding fixture according to claim 2, characterized in that: The limiting cover (6) is also provided with a traveling wheel (15). The traveling wheel (15) is connected to the limiting cover (6) by means of a quadrilateral linkage mechanism. One side of the quadrilateral linkage mechanism is also connected to a support telescopic cylinder (16). At least three sets of traveling wheels (15) are arranged at equal intervals around the limiting cover.

8. The pipe internal support welding fixture according to claim 2, characterized in that: A grinding assembly is also provided on the outer side of the cylinder wall of the connecting part (1). The grinding assembly includes a rotating ring (17) and a bevel grinding head (18). The rotating ring (17) has a rotational degree of freedom to rotate around the connecting part (1). The bevel grinding head (18) is provided with a grinding groove that is recessed into an annular groove. The bevel grinding head (18) is clamped in the welding gap and rotated by means of a grinding motor (19). The grinding motor (19) is set on the grinding base plate (20). The grinding base plate (20) is connected to the rotating ring (17) by means of a pitch seat (21).

9. A welding method based on the pipe internal support welding fixture according to claim 1, characterized in that: Includes the following steps: S1. The pipe body to be welded is hoisted to the welding position of the pipeline, and a welding gap is formed between the pipeline and the pipe body to be welded; S2. Using the walking wheels (15), the welding fixture is passed through the pipe and moved to the welding gap. The support end of the welding fixture on one side extends out from the end of the pipe and is inserted into the pipe on the other side of the welding gap. S3. The push-pull telescopic cylinders (2) on both sides retract synchronously, and the support ends form an expansion connection with the pipe wall of the pipe and the pipe body respectively. With the help of welding fixtures, the pipe and the pipe body on both sides of the weld gap are aligned. The push-pull telescopic cylinders (2) continue to retract, aligning the pipe ends on both sides of the weld gap. Then the push-pull telescopic cylinders (2) extend, releasing the pipe wall. With the help of the walking wheels (15), the middle of the connecting part (1) is located at the weld gap. S4. Continue to extend the push-pull telescopic cylinder (2) to separate the pipe body to be welded from the pipeline and re-form the welding gap. After the width of the welding gap reaches the design requirements, welding is carried out.

10. The welding method according to claim 9, characterized in that: In step S4, after the pipe body to be welded is separated from the pipeline, the push-pull telescopic cylinder (2) continues to extend, so that the bevel grinding column (18) can be lifted from the pipe cavity to the welding gap. Then the push-pull telescopic cylinder (2) retracts, clamping the bevel grinding column (18) in the welding gap. The bevel grinding column rotates and grinds in the welding gap with the help of the rotating ring (17) to form the bevel at the pipe end. After grinding is completed, the welding gap is reopened. After the bevel grinding column (18) is lowered, steps S3 and S4 are repeated to complete the welding.

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