Tensioning device for pipe replacement of oil and gas conveying pipeline and working method of tensioning device

Abstract

The invention discloses a tensioning device for pipe replacement of an oil and gas conveying pipeline and a working method of the tensioning device, and belongs to the field of oil and gas conveying pipeline replacement. The tensioning device comprises a linkage type tensioning driving mechanism, a first-stage tensioning mechanism and a second-stage tensioning mechanism, the first-stage tensioning mechanism and the second-stage tensioning mechanism are connected with the linkage type tensioning driving mechanism, and the linkage type tensioning driving mechanism is of an oil cylinder structure; the oil cylinder structure comprises a shell, a front end cover fixed to the end of the shell and a piston rod arranged in the shell in a sliding mode, the piston rod penetrates out of the shell through the front end cover and then is connected with the first-stage tensioning mechanism, and the piston rod is further connected with the hoisting shaft in a sliding mode. And the front end cover is fixedly connected with the secondary tensioning mechanism. By the adoption of the tensioning device for pipe replacement of the oil and gas conveying pipeline and the working method of the tensioning device, the two base discs are driven through the linkage type tensioning driving mechanism, the working efficiency is improved, the reliability and safety of equipment are improved, and therefore the tensioning device is suitable for pipeline end face groove machining in a narrow space in an urban pipeline repair project.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas pipeline replacement, and in particular to a tensioning device for oil and gas pipeline replacement and a working method thereof. Background Art

[0002] In the construction of modern urban infrastructure, the connection and maintenance of long-distance pipelines are key links to ensure the safe transmission of important materials such as energy and water resources. In order to ensure the quality and efficiency of pipeline connections, automatic welding technology is widely used in the installation and repair projects of long-distance pipelines. Automatic welding has very strict requirements on the size of the pipeline end face groove, so a special groove machine is required to process the pipeline end face groove. Traditional pipe end face groove machines usually use a cylinder piston rod to push two base plates to tighten the pipeline. Specifically, the piston rod in the cylinder pushes the front and rear base plates by compressing the elastic mechanism, so that the connecting rod on the base plate and the tensioning rod in the tensioning plate are retracted outward, thereby achieving uniform tightening of the pipeline. However, this traditional design has the following significant disadvantages: 1. The mechanism is too long: Since the tensioning mechanism is completely dependent on the movement of the cylinder piston rod, the entire mechanism is relatively long, resulting in a large volume of the entire beveling machine, which is difficult to adapt to the narrow operating space. Especially in urban emergency pipeline repair projects, when the cut problem pipeline is particularly short, the operating space is very limited, and the traditional end beveling machine cannot be used effectively.

[0003] 2. Complex parts: Traditional designs contain a large number of parts, such as elastic mechanisms, multiple connecting rods and tensioning rods, which not only increase the weight of the equipment, but also increase manufacturing costs and maintenance difficulties.

[0004] 3. Unstable lifting: As the mechanism is long and bulky, instability is prone to occur during the lifting process, increasing the potential safety hazard of construction. Summary of the invention

[0005] The purpose of the present invention is to provide a tensioning device for replacing an oil and gas pipeline and a working method thereof, so as to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides a tensioning device for replacing a pipe of an oil and gas transmission pipeline, comprising a linkage tensioning driving mechanism and a primary tensioning mechanism and a secondary tensioning mechanism respectively connected to the linkage tensioning driving mechanism, wherein the linkage tensioning driving mechanism is a cylinder structure, the cylinder structure comprising a housing, a front end cover fixed to the end of the housing, and a piston rod slidably arranged inside the housing, the piston rod is connected to the primary tensioning mechanism after passing through the front end cover and passing through the housing, and the piston rod is also slidably connected to the hoisting shaft; The front end cover is fixedly connected to the secondary tensioning mechanism.

[0007] Preferably, the primary tensioning mechanism and the secondary tensioning mechanism both include a base plate and a positioning shell covering the outer circumference of the base plate, and a plurality of tensioning components are evenly arranged on the base plate in a circumferential array, and each tensioning component includes a connecting rod rotatably connected to the base plate at one end and a tensioning rod rotatably connected to the other end of the connecting rod, and the other end of the tensioning rod is opened and fixedly connected to the tensioning shoe after passing through the telescopic channel on the positioning shell, and a moving gap is left between the tensioning rod and the inner wall of the telescopic channel; The base plate of the first-stage tensioning mechanism is fixedly connected to the piston rod, and the base plate of the second-stage tensioning mechanism is fixedly connected to the front end cover via a dragon-shaped positioning sleeve; The positioning shell of the primary tensioning mechanism is fixedly connected to the hoisting shaft and the connecting cover respectively, the connecting cover is fixedly connected to the positioning shell of the secondary tensioning mechanism, and the positioning shell of the secondary tensioning mechanism is fixedly connected to the front end cover; The connecting rod of the primary tensioning mechanism and the connecting rod of the secondary tensioning mechanism are arranged in an axisymmetric manner.

[0008] Preferably, in the initial state, the connecting rod of the primary tensioning mechanism and the connecting rod of the secondary tensioning mechanism are both arranged obliquely.

[0009] A working method of a tensioning device for replacing an oil and gas pipeline, comprising the following steps: S1. Use the lifting equipment to lift the tensioning device to the inside of the port of the pipeline to be repaired, and ensure that the lifting axis of the tensioning device is arranged concentrically with the pipeline to be repaired; S2. Start the oil cylinder structure. Driven by the hydraulic oil, the piston rod extends. During the extension process of the piston rod, the base plate of the primary tensioning mechanism is driven to move, and then the connecting rod of the primary tensioning mechanism is driven to rotate, thereby driving the tensioning rod of the primary tensioning mechanism to extend out of the telescopic channel until the tensioning boot of the primary tensioning mechanism presses against the inner wall of the pipe to be repaired; S3. The hydraulic oil continues to drive. At this time, the first-level tensioning mechanism does not move under the compression of the inner wall of the pipe to be repaired, so that the piston rod does not move. Under the action of the hydraulic oil, the outer shell and the front cover are pushed to move in the opposite direction, thereby driving the base plate of the second-level tensioning mechanism to move, driving the connecting rod of the second-level tensioning mechanism to rotate, and thus driving the tensioning rod of the second-level tensioning mechanism to pass through the telescopic channel until the tensioning shoe of the second-level tensioning mechanism presses against the inner wall of the pipe to be repaired.

[0010] Therefore, the present invention adopts the above-mentioned tensioning device for replacing oil and gas pipelines and the working method thereof, which has the following beneficial effects: 1. Efficient linkage tightening: The oil cylinder structure is used as the linkage tightening driving mechanism, and the first and second tightening mechanisms are driven by hydraulic oil to achieve separate actions, ensuring that the inner wall of the pipeline is gradually tightened at different stages, thereby improving the tightening effect; 2. Shorten the length of the mechanism: Compared with the traditional tensioning device, the elastic mechanism is removed, and the length of the tensioning device is shortened by half, which greatly reduces the volume of the entire beveling machine, allowing it to operate flexibly in a smaller space; At the same time, the reduction in the number of parts reduces the weight of the equipment, improving portability and installation stability; In addition, the shortened length of the mechanism makes the lifting more stable, significantly improving the safety during the construction process.

[0011] In summary, the present invention optimizes the structural design, eliminates unnecessary elastic mechanisms, and adopts a linked tensioning drive mechanism to push the primary tensioning mechanism and the secondary tensioning mechanism respectively to perform tensioning, thereby achieving efficient, precise and stable tensioning effects, significantly improving the quality and efficiency of oil and gas pipeline replacement construction, and also providing operators with a more convenient working experience.

[0012] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A half-cutaway view of a tensioning device for replacing an oil and gas pipeline according to the present invention; Figure 2 It is an axial cross-sectional view of a tensioning device for replacing an oil and gas pipeline according to the present invention; Figure 3 The present invention is a diagram showing the overall appearance of a tensioning device for replacing an oil and gas pipeline.

[0014] Reference numerals 1. Outer shell; 2. Piston rod; 3. Front end cover; 4. Dragon-shaped positioning sleeve; 5. Positioning shell; 6. Tensioning rod; 7. Connecting rod; 8. Base plate; 9. Tensioning shoe; 10. Secondary tensioning mechanism; 11. Connecting cover; 12. Primary tensioning mechanism; 13. Lifting shaft. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not used to limit the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0016] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0017] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0018] like Figure 1-Figure 3 As shown, a tensioning device for replacing an oil and gas pipeline comprises a linkage tensioning drive mechanism and a primary tensioning mechanism 12 and a secondary tensioning mechanism 10 respectively connected to the linkage tensioning drive mechanism. The linkage tensioning drive mechanism is a cylinder structure, which comprises an outer shell 1, a front end cover 3 fixed to the end of the outer shell 1, and a piston rod 2 slidably arranged inside the outer shell 1. The piston rod 2 is connected to the primary tensioning mechanism 12 after passing through the front end cover 3 and is also slidably connected to the lifting shaft 13; the front end cover 3 is fixedly connected to the secondary tensioning mechanism 10.

[0019] Specifically, the primary tensioning mechanism 12 and the secondary tensioning mechanism 10 both include a base plate 8 and a positioning shell 5 covering the outer circumferential side of the base plate 8. A plurality of tensioning components are evenly arranged in a circumferential array on the base plate 8. Each tensioning component includes a connecting rod 7 rotatably connected to the base plate 8 at one end and a tensioning rod 6 rotatably connected to the other end of the connecting rod 7. The other end of the tensioning rod 6 is opened and passes through the telescopic channel on the positioning shell 5 and is fixedly connected to the tensioning shoe 9. A moving gap is left between the tensioning rod 6 and the inner wall of the telescopic channel. The base plate 8 of the tensioning mechanism 12 is fixedly connected to the piston rod 2, and the base plate 8 of the secondary tensioning mechanism 10 is fixedly connected to the front end cover 3 via the dragon-shaped positioning sleeve 4; the positioning shell 5 of the primary tensioning mechanism 12 is fixedly connected to the lifting shaft 13 and the connecting cover 11 respectively, the connecting cover 11 is fixedly connected to the positioning shell 5 of the secondary tensioning mechanism 10, and the positioning shell 5 of the secondary tensioning mechanism 10 is fixedly connected to the front end cover 3; the connecting rod 7 of the primary tensioning mechanism 12 and the connecting rod 7 of the secondary tensioning mechanism 10 are arranged in an axially symmetrical manner.

[0020] In the initial state, the connecting rod 7 of the primary tensioning mechanism 12 and the connecting rod 7 of the secondary tensioning mechanism 10 are both arranged at an inclination.

[0021] A working method of a tensioning device for replacing an oil and gas pipeline, comprising the following steps: S1. Use a hoisting device to hoist the tensioning device to the inside of the port of the pipeline to be repaired, and ensure that the hoisting axis 13 of the tensioning device is arranged concentrically with the pipeline to be repaired; S2, start the oil cylinder structure, and under the drive of the hydraulic oil, the piston rod 2 extends. During the extension process of the piston rod 2, the base plate 8 of the primary tensioning mechanism 12 is driven to move, and then the connecting rod 7 of the primary tensioning mechanism 12 is driven to rotate, thereby driving the tensioning rod 6 of the primary tensioning mechanism 12 to extend out of the telescopic channel until the tensioning shoe 9 of the primary tensioning mechanism 12 presses against the inner wall of the pipe to be repaired; S3, the hydraulic oil continues to drive, at this time, the primary tensioning mechanism 12 does not move under the compression of the inner wall of the pipe to be repaired, so that the piston rod 2 does not move, and the housing 1 and the front end cover 3 are pushed to move in the opposite direction under the action of the hydraulic oil, thereby driving the base plate 8 of the secondary tensioning mechanism 10 to move, driving the connecting rod 7 of the secondary tensioning mechanism 10 to rotate, thereby driving the tensioning rod 6 of the secondary tensioning mechanism 10 to pass through the telescopic channel until the tensioning shoe 9 of the secondary tensioning mechanism 10 presses against the inner wall of the pipe to be repaired.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A tensioning device for replacing an oil and gas pipeline, characterized in that: It includes a linkage tension driving mechanism and a primary tension mechanism and a secondary tension mechanism respectively connected to the linkage tension driving mechanism. The linkage tension driving mechanism is a cylinder structure. The cylinder structure includes a shell, a front end cover fixed to the end of the shell, and a piston rod slidably arranged inside the shell. The piston rod passes through the front end cover and passes through the shell to connect with the primary tension mechanism. The piston rod is also slidably connected to the hoisting shaft. The front end cover is fixedly connected to the secondary tensioning mechanism.

2. The tensioning device for replacing an oil and gas pipeline according to claim 1, characterized in that: The primary tensioning mechanism and the secondary tensioning mechanism both include a base plate and a positioning shell covering the outer circumference of the base plate. A plurality of tensioning components are evenly arranged on the base plate in a circumferential array. Each tensioning component includes a connecting rod rotatably connected to the base plate at one end and a tensioning rod rotatably connected to the other end of the connecting rod. The other end of the tensioning rod is opened and passed through a telescopic channel on the positioning shell and is fixedly connected to a tensioning shoe. A moving gap is left between the tensioning rod and the inner wall of the telescopic channel. The base plate of the primary tensioning mechanism is fixedly connected to the piston rod, and the base plate of the secondary tensioning mechanism is fixedly connected to the front end cover via a dragon-shaped positioning sleeve; The positioning shell of the primary tensioning mechanism is fixedly connected to the hoisting shaft and the connecting cover respectively, the connecting cover is fixedly connected to the positioning shell of the secondary tensioning mechanism, and the positioning shell of the secondary tensioning mechanism is fixedly connected to the front end cover; The connecting rod of the primary tensioning mechanism and the connecting rod of the secondary tensioning mechanism are arranged in an axisymmetric manner.

3. The tensioning device for replacing an oil and gas pipeline according to claim 2, characterized in that: In the initial state, the connecting rod of the primary tensioning mechanism and the connecting rod of the secondary tensioning mechanism are both arranged tilted.

4. A working method of a tensioning device for replacing an oil and gas pipeline as claimed in claim 2 or 3, characterized in that: The following steps are involved: S1. Use the lifting equipment to lift the tensioning device to the inside of the port of the pipeline to be repaired, and ensure that the lifting axis of the tensioning device is arranged concentrically with the pipeline to be repaired; S2. Start the oil cylinder structure. Driven by the hydraulic oil, the piston rod extends. During the extension process of the piston rod, the base plate of the primary tensioning mechanism is driven to move, and then the connecting rod of the primary tensioning mechanism is driven to rotate, thereby driving the tensioning rod of the primary tensioning mechanism to extend out of the telescopic channel until the tensioning boot of the primary tensioning mechanism presses against the inner wall of the pipe to be repaired; S3. The hydraulic oil continues to drive. At this time, the first-level tensioning mechanism does not move under the compression of the inner wall of the pipe to be repaired, so that the piston rod does not move. Under the action of the hydraulic oil, the outer shell and the front end cover are pushed to move in the opposite direction, thereby driving the base plate of the second-level tensioning mechanism to move, driving the connecting rod of the second-level tensioning mechanism to rotate, and thus driving the tensioning rod of the second-level tensioning mechanism to pass through the telescopic channel until the tensioning shoe of the second-level tensioning mechanism presses against the inner wall of the pipe to be repaired.

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