Maintenance and plugging device for gas pipeline

Abstract

A maintenance and plugging device for a gas pipeline. The maintenance and plugging device comprises a plugging airbag (20), and further comprises an inflation / deflation mechanism, an alignment mechanism and a telescopic supporting unit (10), wherein the inflation / deflation mechanism comprises a mounting bracket (8) and an air cylinder assembly, the air cylinder assembly being detachably assembled on the mounting bracket (8); the plugging airbag (20) is detachably assembled at an air port of the air cylinder assembly; the air port of the air cylinder assembly is in communication with an air port of the plugging airbag (20); a deflation switch of the air cylinder assembly is arranged outside a gas pipeline (1); the alignment mechanism is connected to the mounting bracket (8) to form a limiting arrangement of the plugging airbag (20) in the extension direction of the gas pipeline (1); and fixed ends of the supporting unit (10) are arranged around an outer peripheral surface of the air cylinder assembly, and rollers (24) are assembled at telescopic ends of the supporting unit (10), so as to form a limiting arrangement of the plugging airbag (20) in the radial direction of the gas pipeline (1), thereby ensuring the orientation stability of the plugging airbag (20) in the gas pipeline (1), and further preventing the plugging airbag (20) from sliding off, so as to further ensure the sealing reliability of the plugging airbag (20).

Description

A gas pipeline maintenance and sealing device Technical Field

[0001] The present invention relates to the technical field of gas pipeline maintenance equipment, and in particular to a gas pipeline maintenance and plugging device. Background Art

[0002] A gas pipeline is a large-diameter dedicated pipeline used to transport natural gas. It can transport natural gas from the mining site or processing plant to the urban gas distribution center or industrial enterprise users. It is also called a gas transmission pipeline.

[0003] During long-term use, gas pipelines require regular maintenance or repair to ensure the normal transportation of natural gas. When maintaining or repairing gas pipelines, a repair sealing device is required to temporarily seal the maintenance port of the gas pipeline. The commonly used sealing method is to use an inflatable sealing airbag to insert it into the gas pipeline, and then inflate the sealing airbag so that the sealing airbag expands to fit tightly with the inner wall of the gas pipeline to achieve a sealing effect.

[0004] Some existing repair and plugging devices lack positioning and support for the plugging airbag, resulting in poor stability of the plugging airbag in the gas pipeline, such as displacement or slippage, which in turn affects the sealing of the gas pipeline.

[0005] The other part of the maintenance and sealing device only has an inflation mechanism. After the inflation is completed, the valve of the sealing airbag located in the gas pipeline is closed. After the maintenance or repair is completed, it is necessary to enter the gas pipeline and manually open the valve to deflate the sealing airbag. However, due to the limited space in the gas pipeline, it is difficult for maintenance personnel to perform the deflation operation in the gas pipeline, causing operational inconvenience.

[0006] Summary of the Invention

[0007] Therefore, in order to solve the above problems, the present invention provides a gas pipeline maintenance and plugging device.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] 14. The repair and sealing device of claim 13, wherein the air-blocking device is configured to be installed in a manner that allows the air to be filled in and out of the gas pipe and to be retractable and slideable on the inner wall of the gas pipe. The air-blocking device comprises a mounting bracket and an air cylinder assembly for inflating and deflating air, the air cylinder assembly being detachably mounted on the mounting bracket, the air-blocking air bag being detachably mounted at the air port of the air cylinder assembly, the air port of the air cylinder assembly being connected to the air port of the air-blocking air bag, and the deflation switch of the air cylinder assembly being arranged outside the gas pipe. The docking mechanism is connected to the mounting bracket of the air-blocking device to form a limit setting for the air-blocking device and the air-blocking air bag in the extension direction of the gas pipe. The fixed end of the support unit is arranged around the outer circumference of the air cylinder assembly, the retractable end of the support unit is equipped with a roller, and the wheel surface of the roller abuts the inner wall of the gas pipe to form a limit setting for the air-blocking device and the air-blocking air bag in the radial direction of the gas pipe.

[0010] Furthermore, the docking mechanism includes a fixing clamp unit for clamping the outer circumferential surface of the gas pipeline, a fixing piece symmetrically fixed on the fixing clamp unit, and a clamping unit for clamping the mounting bracket; the fixing piece has a limiting slide groove for accommodating the mounting bracket, and the mounting bracket can be movably passed through the limiting slide groove to form a detachable setting; the clamping unit is assembled on the fixing piece.

[0011] Furthermore, the fixing clamp unit includes at least two fixing clamps surrounding the outer circumference of the gas pipeline and a fixing column arranged between the ends of two adjacent fixing clamps, and the fixing clamps and the ends of the fixing column are fixed by a bolt; two fixing parts are respectively fixedly assembled on the corresponding fixing clamps.

[0012] Furthermore, the clamping unit includes a first screw-nut pair, a fixed bracket, a movable frame and a movable column that can be raised and lowered and assembled in the fixed bracket; the fixed bracket is fixed on the side of the fixed part away from the fixed clamp; the nut of the first screw-nut pair is fixed on the fixed bracket, and the end of the screw of the first screw-nut pair is sequentially passed through the nut of the first screw-nut pair and the fixed bracket and is fixed with the movable column; the two ends of the movable column are respectively fixedly assembled with the movable frames, and the two movable frames are respectively located on both sides of the fixed part; the mounting bracket passes through the limiting slide groove and the two movable frames, and an elastic connecting part is provided between the movable column and the fixed part.

[0013] Furthermore, the outer peripheral surface of the mounting bracket is provided with an inwardly concave fixing groove, and the inner wall of the movable frame has a protrusion that matches the fixing groove, and the protrusion corresponds to the fixing groove to form a clamping arrangement.

[0014] Furthermore, the elastic connecting member is a first spring.

[0015] Furthermore, the air cylinder assembly includes a second screw nut pair, a piston connecting pipe, a hollow air cylinder body and a movable plug arranged in the air cylinder body; the movable plug and the air cylinder body are sealed and form an air cavity connected to the air port of the air cylinder body, and the air port of the air cylinder body is the air port of the air cylinder assembly; the movable plug has a central cavity running through the inner and outer surfaces, and the piston connecting pipe is inserted in the central cavity of the movable plug and forms a sealing fixation; the nut of the second screw nut pair is fixed on the end of the piston connecting pipe away from the movable plug, and one end of the screw of the second screw nut pair is sequentially passed through the piston connecting pipe and the central cavity of the movable plug, and is equipped with a sealing plug that cooperates with the seal of the movable plug; the inner wall of the piston connecting pipe is provided with an air outlet long groove connected to the air cavity, and the screw of the second screw nut pair drives the sealing plug to switch between an inflation position for sealing and cooperating with the movable plug and a deflation position for releasing the seal and cooperating with the movable plug, so as to form a deflation switch setting of the air cylinder assembly.

[0016] Furthermore, the movable plug has a sealing groove for accommodating the sealing plug, and the sealing groove of the movable plug surrounds the central cavity; the sealing plug is movably inserted into the sealing groove of the movable plug.

[0017] Furthermore, the support unit includes a plurality of support seats, a support rod and a second spring, the support seats are evenly arranged on the outer circumference of the air cylinder body, the support rod is movably inserted in the support seat, the second spring is installed between the support rod and the support seat, and the roller is fixedly installed on one end of the support rod away from the support seat; the support seat is the fixed end of the support unit, and the end of the support rod away from the second spring is the telescopic end of the support unit.

[0018] Furthermore, a two-way valve is provided between the blocking airbag and the inflation and deflation mechanism.

[0019] The technical solution provided by the present invention has the following beneficial effects:

[0020] The inflation and deflation mechanism is positioned by the docking mechanism to achieve limited fixation of the sealing airbag fixed to the inflation and deflation mechanism in the extension direction of the gas pipeline. At the same time, the support unit circumferentially supports the gas cylinder assembly in the gas pipeline to achieve limited fixation of the inflation and deflation mechanism and the sealing airbag in the radial direction of the gas pipeline, thereby ensuring the posture stability of the sealing airbag in the gas pipeline, preventing the sealing airbag from slipping in the gas pipeline, and further ensuring the sealing reliability of the sealing airbag.

[0021] Moreover, after the maintenance or repair is completed, the blocking air bag can be deflated by simply using the deflation switch of the gas cylinder assembly arranged outside the gas pipeline, avoiding the maintenance personnel from performing the deflation operation inside the gas pipeline. The structure is simple and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic diagram showing the connection of a gas pipeline maintenance and plugging device according to an embodiment;

[0023] FIG2 is a schematic diagram showing the assembly of the fixing clamp unit and the fixing member on the gas pipeline in the embodiment;

[0024] FIG3 is an enlarged schematic diagram of area A in FIG1 ;

[0025] FIG4 is a partial view of the gas cylinder assembly in the embodiment;

[0026] FIG5 shows a state diagram of the gas cylinder body and the support unit in the gas pipeline according to the embodiment. DETAILED DESCRIPTION

[0027] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, one of ordinary skill in the art will understand other possible embodiments and the advantages of the present invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0028] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0029] 1 to 5 , the present embodiment provides a gas pipeline maintenance and plugging device (hereinafter referred to as the maintenance and plugging device), which includes a plugging airbag 20 for plugging the gas pipeline 1, an inflation and deflation mechanism, a docking mechanism for cooperating with the inflation and deflation mechanism for positioning, and a support unit 10 that can slide and be retracted on the inner wall of the gas pipeline 1. The inflation and deflation mechanism includes a mounting bracket and an air cylinder assembly for inflation and deflation, the air cylinder assembly is detachably mounted on the mounting bracket 8, the plugging airbag 20 is detachably mounted at the gas port of the air cylinder assembly, and the air cylinder assembly is removably mounted on the mounting bracket 8. The air port of the assembly is connected to the air port of the sealing airbag 20, and the deflation switch of the gas cylinder assembly is arranged outside the gas pipeline 1. The docking mechanism is connected to the mounting bracket 8 of the inflation and deflation mechanism to form a limit setting of the inflation and deflation mechanism and the sealing airbag 20 in the extension direction of the gas pipeline 1. The fixed end of the support unit 10 is arranged around the outer peripheral surface of the gas cylinder assembly, and the telescopic end of the support unit 10 is equipped with a roller 24, and the wheel surface of the roller 24 abuts the inner wall of the gas pipeline 1 to form a limit setting of the inflation and deflation mechanism and the sealing airbag 20 in the radial direction of the gas pipeline 1.

[0030] In this embodiment, a two-way valve 19 is provided between the blocking airbag 20 and the air cylinder assembly of the inflation and deflation mechanism, and the two-way valve 19 is always in an open state when the maintenance blocking device is in use, and is closed when not in use.

[0031] When the blocking airbag 20 is inflated, the air port of the air cylinder assembly and the air port of the blocking airbag 20 both serve as air inlets.

[0032] When the blocking airbag 20 is deflated, the air port of the air cylinder assembly and the air port of the blocking airbag 20 both serve as air outlets.

[0033] The inflation and deflation mechanism is positioned by the docking mechanism to achieve limited fixation of the sealing airbag 20 fixed to the inflation and deflation mechanism in the extension direction of the gas pipeline 1. At the same time, the support unit 10 provides circumferential support to the gas cylinder assembly in the gas pipeline 1 to achieve limited fixation of the inflation and deflation mechanism and the sealing airbag 20 in the radial direction of the gas pipeline 1, thereby ensuring the posture stability of the sealing airbag 20 in the gas pipeline 1, thereby preventing the sealing airbag 20 from slipping in the gas pipeline 1, and further ensuring the sealing reliability of the sealing airbag 20.

[0034] Moreover, after the maintenance or repair is completed, it is only necessary to use the deflation switch of the gas cylinder assembly arranged outside the gas pipeline 1 to perform the deflation operation on the blocking airbag 20, avoiding the maintenance personnel from performing the deflation operation inside the gas pipeline 1. The structure is simple and the operation is convenient.

[0035] In another preferred embodiment, the docking mechanism includes a fixing clamp unit 15 for clamping the outer peripheral surface of the gas pipeline 1, a fixing part 5 symmetrically fixed on the fixing clamp unit 15, and a clamping unit 16 for clamping the mounting bracket 8. The fixing part 5 has a limiting slide groove 51 for accommodating the mounting bracket 8. The mounting bracket 8 can be movably passed through the limiting slide groove 51 to form a detachable setting. The clamping unit 16 is assembled on the fixing part 5.

[0036] More specifically, the fixing clamp unit 15 includes two fixing clamps 2 surrounding the outer circumference of the gas pipeline 1 and a fixing column 4 arranged between the ends of the two adjacent fixing clamps 2. The ends of the fixing clamps 2 and the fixing column 4 are fixed by a bolt 3, and two fixing parts 5 are respectively fixedly assembled on the corresponding fixing clamps 2.

[0037] The clamping unit 16 shown in Figure 3 includes a first screw nut pair 14, a fixed bracket 6, a movable frame 12 and a movable column 11 that can be lifted and lowered and assembled in the fixed bracket 6. The fixed bracket 6 is fixed to the side of the fixing piece 5 away from the fixing clamp 2. The nut of the first screw nut pair 14 is fixed on the fixing bracket 6. The end of the screw of the first screw nut pair 14 is sequentially passed through the nut of the first screw nut pair 14 and the fixed bracket 6 and is fixed with the movable column 11. The two ends of the movable column 11 are respectively fixedly assembled with movable frames 12, and the two movable frames 12 are respectively located on both sides of the fixing piece 5. The mounting bracket 8 passes through the limiting slide groove 51 and the two movable frames 12, and an elastic connecting piece 7 is provided between the movable column 11 and the fixing piece 5.

[0038] The outer peripheral surface of the mounting bracket 8 is provided with an inwardly concave fixing groove 9 , and the inner wall of the movable frame 12 has a protrusion 13 that matches the fixing groove 9 , and the protrusion 13 corresponds to the fixing groove 9 to form a clamping arrangement.

[0039] In this specific embodiment, the elastic connecting member 7 is a first spring. When the first spring is in a compressed state, the first spring applies an upward elastic force to the movable column 11 .

[0040] The movable frame 12 has windows that pass through the inner and outer surfaces. The height of the windows of the movable frame 12 in the upper and lower directions is greater than the inner diameter of the limiting slide groove 51 of the fixing member 5, so that the protrusion 13 of the movable frame 12 can cooperate with the fixing groove 9 of the mounting bracket 8 to form a clamping setting.

[0041] The two fixing clamps 2 are respectively located above and below the gas pipeline 1. First, the two fixing clamps 2 are pressed against the outer circumference of the gas pipeline 1, and then the two fixing clamps 2 are fixed together by the fixing columns 4 and bolts 3. The pre-tightening force of the bolts 3 is adjusted to adjust the clamping force of the fixing clamp unit 15 on the gas pipeline 1 to achieve stable fixation.

[0042] The screw of the first screw nut pair 14 is rotated in the first direction by external force, and the external force overcomes the elastic limit of the first spring to drive the movable column 11 to slide downward in the fixed bracket 6, thereby driving the movable frame 12 fixed at both ends of the movable column 11 to move downward, and the protrusion 13 of the movable frame 12 gradually drops until the protrusion 13 of the movable frame 12 passes downward over the lowest point of the groove wall of the limiting slide groove 51 of the fixing member 5. At this time, the movable frame 12 is passed through the limiting slide groove 51 of the fixing member 5, and the installation position of the mounting bracket 8 in the extension direction of the gas pipeline 1 is adjusted to adjust the installation position of the gas cylinder assembly (with the sealing airbag 20) fixed on the mounting bracket 8 in the extension direction of the gas pipeline 1, thereby adjusting the sealing position of the sealing airbag 20 in the gas pipeline 1 along the extension direction of the gas pipeline 1.

[0043] Afterwards, the screw of the first screw nut pair 14 is rotated in a second direction opposite to the first direction by external force to drive the movable column 11 to slide upward in the fixed bracket 6, thereby driving the movable frame 12 fixed at both ends of the movable column 11 to move upward, and the protrusion 13 of the movable frame 12 gradually rises until the protrusion 13 of the movable frame 12 is engaged with the fixing groove 9 of the mounting bracket 8, so as to achieve the limited fixation of the mounting bracket 8 in the extension direction of the gas pipeline 1, thereby achieving the fixation of the blocking airbag 20 in the gas pipeline 1 along the extension direction of the gas pipeline 1. At this time, the first spring applies an upward elastic force to the movable column 11 and the protrusion 13 of the movable frame 12 to achieve elastic support, so as to further ensure the stability and firmness of the engaging relationship between the protrusion 13 of the movable frame 12 and the fixing groove 9 of the mounting bracket 8.

[0044] Of course, in other embodiments, the number of the fixing clips 2 may also be 3, 4, or 5, etc., which will not be described in detail here.

[0045] Furthermore, the elastic connecting member 7 may also be a spring assembly.

[0046] In another preferred embodiment, the gas cylinder assembly includes a second screw nut pair 29, a piston connecting pipe 17, a hollow gas cylinder body 18 and a movable plug 26 arranged in the gas cylinder body 18, the movable plug 26 and the gas cylinder body 18 are sealed and form an air cavity communicating with the gas port of the gas cylinder body 18, the gas port of the gas cylinder body 18 is the gas port of the gas cylinder assembly, the movable plug 26 has a central cavity that passes through the inner and outer surfaces, the piston connecting pipe 17 is inserted into the central cavity of the movable plug 26, and forms a sealed fixation, the nut of the second screw nut pair 29 Fixed at one end of the piston connecting tube 17 away from the movable plug 26, one end of the screw of the second screw nut pair 29 passes through the central cavities of the piston connecting tube 17 and the movable plug 26 in sequence, and is equipped with a sealing plug 30 that seals with the movable plug 26. The inner wall of the piston connecting tube 17 is provided with a long air outlet groove connected to the air cavity, and the screw of the second screw nut pair 29 drives the sealing plug 30 to switch between an inflation position that seals and cooperates with the movable plug 26 and a deflation position that releases the seal and cooperates with the movable plug 26, so as to form a deflation switch setting of the air cylinder assembly.

[0047] In this embodiment, one end of the long air outlet groove on the inner wall of the piston connecting tube 17 is connected to the air cavity and the central cavity of the movable plug 26, and the other end is connected to the outside atmosphere.

[0048] A handle is fixedly mounted on one end of the piston connecting tube 17 away from the movable plug 26 so that maintenance personnel can use the handle to conveniently force the piston connecting tube 17 and the movable plug 26 to move back and forth in the cylinder body 18 to achieve inflation.

[0049] When the air cylinder assembly is needed to inflate the blocking air bag 20, the maintenance personnel will first rotate the screw of the second screw nut pair 29 to drive the sealing plug 30 fixed on the screw of the second screw nut pair 29 to approach the movable plug 26 until the sealing plug 30 and the movable plug 26 are tightly fitted to form a good sealing fit (the position at this time corresponds to the inflation position) to prevent air leakage or deflation. After that, the maintenance personnel will use the handle to force the piston connecting tube 17 and the movable plug 26 to move back and forth repeatedly in the air cylinder body 18 to achieve inflation of the blocking air bag 20.

[0050] When it is necessary to deflate the blocking airbag 20, the maintenance personnel rotates the screw of the second screw nut pair 29 to drive the sealing plug 30 fixed on the screw of the second screw nut pair 29 away from the movable plug 26 until a gap is formed between the sealing plug 30 and the movable plug 26, that is, the sealing cooperation between the sealing plug 30 and the movable plug 26 is released (the position at this time corresponds to the deflation position). At this time, the gas in the blocking airbag 20 passes through the two-way valve 19, the air port of the cylinder body 18, the air cavity of the cylinder body 18, the central cavity of the movable plug 26 and the air outlet groove on the inner wall of the piston connecting tube 17 in sequence, and then is discharged into the outside atmosphere to achieve deflation of the blocking airbag 20.

[0051] Further preferably, as shown in FIG4 , the movable plug 26 has a sealing groove for accommodating the sealing plug 30 , the sealing groove of the movable plug 26 surrounds the central cavity, and the sealing plug 30 is movably inserted into the sealing groove of the movable plug 26 .

[0052] When inflation is required, by moving the sealing plug 30 into the sealing groove of the movable plug 26, the outer wall of the sealing plug 30 and the groove wall of the sealing groove of the movable plug 26 can fit more closely to further ensure airtightness.

[0053] When deflation is required, the screw of the second screw nut pair 29 is rotated to make the sealing plug 30 and the screw of the second screw nut pair 29 rotate and move synchronously until they are moved out of the sealing groove of the movable plug 26, thereby releasing the sealing fit between the sealing plug 30 and the movable plug 26.

[0054] In another preferred embodiment, the support unit 10 shown in Figure 5 includes four support seats 21, a support rod 23 and a second spring 22. The support seats 21 are evenly arranged on the outer peripheral surface of the air cylinder body 18, and the support rod 23 is movably inserted into the support seat 21. A second spring 22 is installed between the support rod 23 and the support seat 21. The end of the support rod 23 facing away from the support seat 21 is fixedly equipped with a roller 24. The support seat 21 is the fixed end of the support unit 10, and the end of the support rod 23 facing away from the second spring 22 is the telescopic end of the support unit 10.

[0055] In a specific implementation, the number of the support seat 21, the support rod 23, the second spring 22 and the roller 24 is four.

[0056] The four support seats 21 are arranged at equal angles on the outer peripheral surface of the cylinder body 18 , that is, the interval between two adjacent support seats 21 (or two adjacent support rods 23 ) is 90 degrees.

[0057] Through the elastic connection of the second spring 22, elastic support is achieved between the support rod 23 and the support seat 21, so that when the roller 24 on the support rod 23 is subjected to the supporting reaction force of the inner wall of the gas pipeline 1, the second spring 22 is forced to undergo elastic deformation, so that the roller 24 forms corresponding elastic expansion and contraction, so as to adaptively adjust the radial position of the gas cylinder body 18 in the gas pipeline 1, thereby ensuring the posture stability of the blocking airbag 20 in the gas pipeline 1, and preventing the blocking airbag 20 from slipping in the gas pipeline 1.

[0058] The specific method of using the maintenance and plugging device of this embodiment is as follows:

[0059] When the gas pipeline 1 needs to be maintained and blocked, first, the two fixing clamps 2 are respectively engaged and connected to the upper and lower sides of the outer circumference of the gas pipeline 1, and then the two fixing clamps 2 are fixed by the fixing columns 4 and bolts 3, and the bolts 3 are tightened to make the fixing clamps 2 hug the outer circumference of the gas pipeline 1.

[0060] At the same time, the gas cylinder assembly is detachably connected to the mounting bracket 8 through a connecting plate, and then the valve of the two-way valve 19 is opened. Thereafter, the uninflated sealing airbag 20 and the gas cylinder body 18 are inserted into the gas pipeline 1 in sequence. The rollers 24 on the outer periphery of the gas cylinder body 18 roll and adaptively retract on the inner wall of the gas pipeline 1 to ensure the posture stability of the sealing airbag 20 in the gas pipeline 1.

[0061] Then, the two ends of the mounting bracket 8 are respectively passed through the limiting slide grooves 51 of the corresponding fixing parts 5, and after adjusting the blocking position of the blocking airbag 20 in the gas pipeline 1, the protrusion 13 of the movable frame 12 and the fixing groove 9 of the mounting bracket 8 are clamped together through the clamping unit 16 to achieve the limiting fixation of the movable frame 12 in the extension direction of the gas pipeline 1, prevent the movable frame 12 and the mounting bracket 8 from loosening, and improve the tightness between them.

[0062] Afterwards, the handle on the piston connecting tube 17 is used to repeatedly push and pull the piston connecting tube 17, so that the piston connecting tube 17 drives the movable plug 26 to move back and forth repeatedly in the cylinder body 18, so that the gas from the outside is sucked into the air cavity of the cylinder body 18 through the gap formed between the movable plug 26 and the cylinder body 18, and then the gas is pressed into the blocking airbag 20. The operation is repeated to inflate the blocking airbag 20 so that the blocking airbag 20 fits tightly against the inner wall of the gas pipeline 1. At the same time, the support unit 10 is adaptively extended and retracted to match the real-time posture of the blocking airbag 20 in the gas pipeline 1, so as to achieve the blocking of the maintenance port of the gas pipeline 1, and then the gas pipeline 1 can be maintained and repaired.

[0063] After completing the maintenance and inspection of the gas pipeline 1, the screw of the second screw nut pair 29 is rotated to make the sealing plug 30 and the screw of the second screw nut pair 29 rotate and move synchronously until they are moved out of the sealing groove of the movable plug 26, so as to release the sealing cooperation between the sealing plug 30 and the movable plug 26. The gas in the sealing airbag 20 passes through the two-way valve 19, the air port of the cylinder body 18, the air cavity of the cylinder body 18, the central cavity of the movable plug 26 and the air outlet groove on the inner wall of the piston connecting tube 17 in sequence, and then is discharged into the outside atmosphere to achieve the deflation of the sealing airbag 20.

[0064] After the deflation of the blocking airbag 20 is completed, the blocking airbag 20 releases the blocking of the gas pipeline 1, and then the clamping relationship between the clamping unit 16 and the mounting bracket 8 is released, and then the mounting bracket 8 is pulled out from the fixing part 5 to realize the detachable separation between the mounting bracket 8 and the docking mechanism, and then the gas cylinder assembly and the mounting bracket 8 are disassembled and separated through the connecting plate, and then the blocking airbag 20 and the gas cylinder body 18 are pulled out of the gas pipeline 1, and then the blocking airbag 20 and the gas cylinder body 18 are disassembled, and the valve of the two-way valve 19 is closed at the same time, and then the fixing clamp 2 is removed from the gas pipeline 1 and neatly stacked respectively, thereby completing the disassembly of the maintenance blocking device, so as to facilitate the storage of the various components of the maintenance blocking device, and also facilitate carrying and secondary use, and the structure is simple and easy to operate.

[0065] Of course, in other embodiments, the number of the support seat 21, the support rod 23, the second spring 22 and the roller 24 can be 3 or 5, etc., which will not be described in detail here.

[0066] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A repair plugging device for a gas pipeline, comprising a plugging airbag for plugging the gas pipeline, characterized in that: It also includes a gas charging and discharging mechanism, a docking mechanism that cooperates with the gas charging and discharging mechanism for positioning, and a support unit that can slide on the inner wall of the gas pipeline and is retractable; The inflation and deflation mechanism comprises a mounting bracket and a gas cylinder assembly for inflation and deflation, the gas cylinder assembly is detachably mounted on the mounting bracket, the blocking air bag is detachably mounted at the gas port of the gas cylinder assembly, the gas port of the gas cylinder assembly is connected to the gas port of the blocking air bag, and the deflation switch of the gas cylinder assembly is arranged outside the gas pipeline; The docking mechanism is connected to the mounting bracket of the inflation and deflation mechanism to form a limiting arrangement of the inflation and deflation mechanism and the blocking airbag in the extension direction of the gas pipeline; The fixed end of the support unit is arranged around the outer circumferential surface of the gas cylinder assembly, and the telescopic end of the support unit is equipped with a roller, and the wheel surface of the roller abuts against the inner wall of the gas pipeline to form a limiting setting of the inflation and deflation mechanism and the sealing airbag in the radial direction of the gas pipeline.

2. The repair plugging device for a gas pipeline according to claim 1, characterized in that: The docking mechanism includes a fixing clamp unit for clamping the outer circumferential surface of the gas pipeline, a fixing piece symmetrically fixed on the fixing clamp unit, and a clamping unit for clamping the mounting bracket; the fixing piece has a limiting slide groove for accommodating the mounting bracket, and the mounting bracket can be movably passed through the limiting slide groove to form a detachable arrangement; the clamping unit is assembled on the fixing piece.

3. The repair plugging device for gas pipelines according to claim 2, characterized in that: The fixing clamp unit includes at least two fixing clamps surrounding the outer circumference of the gas pipeline and a fixing column arranged between the ends of two adjacent fixing clamps, and the ends of the fixing clamp and the fixing column are fixed by a bolt; two fixing members are respectively fixedly assembled on the corresponding fixing clamps.

4. The repair plugging device for gas pipelines according to claim 2, characterized in that: The clamping unit includes a first screw nut pair, a fixed bracket, a movable frame and a movable column that can be lifted and lowered and is assembled in the fixed bracket; the fixed bracket is fixed to the side of the fixing piece away from the fixing clamp; the nut of the first screw nut pair is fixed to the fixing bracket, and the end of the screw of the first screw nut pair is successively passed through the nut of the first screw nut pair and the fixed bracket and is fixed with the movable column; the two ends of the movable column are respectively fixedly assembled with the movable frames, and the two movable frames are respectively located on both sides of the fixing piece; the mounting bracket passes through the limiting slide groove and the two movable frames, and an elastic connecting piece is arranged between the movable column and the fixing piece.

5. The repair plugging device for a gas pipeline according to claim 4, characterized in that: The outer peripheral surface of the mounting bracket is provided with an inwardly concave fixing groove, and the inner wall of the movable frame has a convex block matching the fixing groove, and the convex block corresponds to the fixing groove to form a clamping arrangement.

6. The repair plugging device for a gas pipeline according to claim 4, characterized in that: The elastic connecting member is a first spring.

7. The repair plugging device for gas pipelines according to claim 1, characterized in that: The gas cylinder assembly comprises a second screw nut pair, a piston connecting pipe, a hollow gas cylinder body and a movable plug arranged in the gas cylinder body; the movable plug and the gas cylinder body are sealed and form an air cavity connected to the gas port of the gas cylinder body, and the gas port of the gas cylinder body is the gas port of the gas cylinder assembly; the movable plug has a central cavity that runs through the inner and outer surfaces, and the piston connecting pipe is inserted in the central cavity of the movable plug to form a sealing fixation; the nut of the second screw nut pair is fixed to the end of the piston connecting pipe away from the movable plug, and one end of the screw of the second screw nut pair passes through the central cavity of the piston connecting pipe and the movable plug in turn, and is equipped with a sealing plug that cooperates with the sealing of the movable plug; the inner wall of the piston connecting pipe is provided with a long air outlet groove connected to the air cavity, and the screw of the second screw nut pair drives the sealing plug to switch between an inflation position that seals and cooperates with the movable plug and a deflation position that releases the seal and cooperates with the movable plug, so as to form a deflation switch setting of the gas cylinder assembly.

8. The repair plugging device for a gas pipeline according to claim 7, characterized in that: The movable plug has a sealing groove for accommodating the sealing plug, and the sealing groove of the movable plug surrounds the central cavity; the sealing plug can be movably inserted in the sealing groove of the movable plug.

9. The maintenance plugging device for a gas pipeline according to claim 7, wherein: The support unit includes a plurality of support seats, a support rod and a second spring, the support seats are evenly arranged on the outer circumferential surface of the air cylinder body, the support rod is movably inserted in the support seat, the second spring is installed between the support rod and the support seat, and the roller is fixedly installed on one end of the support rod away from the support seat; the support seat is the fixed end of the support unit, and the end of the support rod away from the second spring is the telescopic end of the support unit.

10. The repair and plugging device for gas pipelines according to any one of claims 1-9, characterized in that: A two-way valve is arranged between the blocking airbag and the inflation and deflation mechanism.

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