CN113431979B - Dismounting device for safety plug of gas pipeline - Google Patents
Dismounting device for safety plug of gas pipeline Download PDFInfo
- Publication number
- CN113431979B CN113431979B CN202110546227.6A CN202110546227A CN113431979B CN 113431979 B CN113431979 B CN 113431979B CN 202110546227 A CN202110546227 A CN 202110546227A CN 113431979 B CN113431979 B CN 113431979B
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- shell
- sealing
- gas pipeline
- ring
- rubber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow from or in pipes or hoses
- F16L55/11—Plugs
- F16L55/1108—Plugs fixed by screwing or by means of a screw-threaded ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow from or in pipes or hoses
- F16L55/11—Plugs
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a dismounting device for a safety plug of a gas pipeline, which comprises a knob, a slot, a fixing device, a rubber umbrella skirt head and a fixing bolt, wherein the fixing device is arranged, the fixing device is in threaded connection with the gas pipeline through a threaded joint to plug the gas pipeline, an outer sealing ring is arranged on the outer side of the fixing device, sealing rubber on the inner side of the outer sealing ring is sleeved on the outer side of the gas pipeline to perform double-layer sealing on the gas pipeline, so that the sealing effect on the gas pipeline is improved, a movable shell is arranged on the outer side of a shell of the outer sealing ring, the movable shell is supported through a spring, a rotating block and a lug are arranged on the outer side of the shell and the inner side of the movable shell, the shell can be rotated only by pressing the movable shell to align the positions of the rotating block and the lug, the shell is prevented from being easily rotated to be easily loosened to influence the sealing effect on the gas pipeline, increase the sealed effect of shutoff to gas pipeline, and easy dismounting, simple to use.
Description
Technical Field
The invention relates to the field related to pipeline plugs, in particular to a dismounting device for a safety plug of a gas pipeline.
Background
At present, fuel gas is a general term for gas fuel, and can be combusted to release heat for urban residents and industrial enterprises. The gas is various, mainly including natural gas, artificial gas, liquefied petroleum gas and methane, and the gas population in cities keeps a rapid growth situation in the 21 st century, and accordingly, the popularization rate of the Chinese gas industry is rapidly improved.
The gas pipeline generally needs the end cap to carry out the shutoff, avoids the gas to leak, and current end cap generally is the pipe cap form, and is fixed through carrying out threaded connection with gas pipeline, and sealed effect is general, causes the problem that the inside gas of gas pipeline leaked easily.
Disclosure of Invention
Therefore, in order to solve the above-mentioned disadvantages, the present invention provides a device for assembling and disassembling a safety plug of a gas pipeline.
The invention is realized by constructing a dismounting device for a safety plug of a gas pipeline, which comprises a knob and a fixing device, the middle part of the right end of the knob is provided with a slot, the left end of the knob is fixedly connected with a fixing device, the middle part of the left end of the fixing device is mutually locked with the rubber umbrella skirt head through a fixing bolt, the fixing device comprises a support column, a threaded joint, a rubber ring, an outer sealing ring and a support ring, the threaded joint is fixed in the middle of the left end of the support column, the rubber ring is sleeved outside the threaded joint, the right end of the rubber ring is mutually bonded with the support column, the outer side of the support column is sleeved with the outer sealing ring, the inner side of the outer sealing ring is in threaded connection with the support column, the right end of the outer side of the strut is provided with a support ring, the right end of the strut is fixedly connected with a knob, and the circle center of the left end of the threaded joint is mutually locked with the rubber umbrella skirt head through a fixing bolt.
Preferably, the external seal ring includes activity shell, turning block, sealed inner ring and spring, the activity shell inboard is provided with the turning block, the activity shell cup joints in the sealed inner ring outside, sealed inner ring right-hand member passes through spring and activity shell elastic connection, activity shell, sealed inner ring and spring all cup joint in the pillar outside, and sealed inner ring and pillar threaded connection.
Preferably, sealed inner ring includes shell, lug, bearing and sealing rubber, shell outside left end is provided with the lug, the inboard embedding of shell has the bearing, the inboard sealing rubber that bonds of bearing, the inside right side of shell cup joints at the pillar outer wall, and shell and pillar threaded connection, the movable shell cup joints in the shell outside, and the shell right-hand member passes through spring and movable shell elastic connection.
Preferably, the circle centers of the fixing device, the knob and the skirt head of the rubber umbrella are in the same straight line, and the slot and the knob are arranged concentrically.
Preferably, the support ring is annular, and the support ring external diameter is greater than activity shell right-hand member internal diameter.
Preferably, a layer of rubber pad is sleeved on the outer side of the movable shell, and anti-skid grains are arranged on the outer side of the rubber pad.
Preferably, the rotating blocks and the protruding blocks are respectively provided with two rotating blocks, and the two rotating blocks are arranged on the right sides of the protruding blocks.
Preferably, the outer wall of the shell is smooth, and the inner wall of the left end of the movable shell is attached to the shell.
Preferably, the inner sealing ring and the outer shell are concentrically arranged, and the outer shell, the bearing, the sealing rubber and the support are concentrically arranged.
Preferably, the outer side of the sealing rubber is cylindrical, and the inner diameter of the sealing rubber is gradually reduced from left to right.
Preferably, the shell and the projection are both made of stainless steel.
Preferably, the sealing rubber is made of nitrile rubber.
The invention has the following advantages: the invention provides a dismounting device for a safety plug of a gas pipeline through improvement, which has the following improvement compared with the same type of equipment:
the method has the advantages that: according to the dismounting device for the safety plug of the gas pipeline, the fixing device is arranged and is in threaded connection with the gas pipeline through the threaded connector to plug the gas pipeline, the outer sealing ring is arranged on the outer side of the fixing device, the sealing rubber on the inner side of the outer sealing ring is sleeved on the outer side of the gas pipeline to seal the gas pipeline in a double-layer mode, and the sealing effect on the gas pipeline is improved;
the method has the advantages that: according to the dismounting device for the safety plug of the gas pipeline, the movable shell is arranged on the outer side of the outer shell of the outer sealing ring and supported by the spring, the rotating block and the protruding block are arranged on the outer side of the outer shell and the inner side of the movable shell, the outer shell can only rotate by pressing the movable shell to align the rotating block and the protruding block, the phenomenon that the outer shell is easy to rotate and loose due to easy loosening is avoided, the sealing effect of the gas pipeline is influenced, the sealing effect of plugging the gas pipeline is improved, dismounting is convenient, and use is simple.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the internal structure of the present invention;
FIG. 3 is a schematic view of the strut structure of the present invention;
FIG. 4 is a cross-sectional view of the internal structure of the outer sealing ring of the present invention;
FIG. 5 is a right sectional view of the inner structure of the outer sealing ring of the present invention;
FIG. 6 is a cross-sectional view of the inner structure of the inner seal ring of the present invention.
Wherein: the device comprises a knob-1, a slot-2, a fixing device-3, a rubber umbrella skirt-4, a fixing bolt-5, a support column-31, a threaded joint-32, a rubber ring-33, an outer sealing ring-34, a support ring-35, a movable shell-341, a rotating block-342, a sealing inner ring-343, a spring-344, a shell-3431, a bump-3432, a bearing-3433 and sealing rubber-3434.
Detailed Description
The present invention will be described in detail below with reference to fig. 1 to 6, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, the invention provides a dismounting device for a safety plug of a gas pipeline by improvement, which comprises a knob 1 and a fixing device 3, wherein a slot 2 is formed in the middle of the right end of the knob 1, the left end of the knob 1 is fixedly connected with the fixing device 3, the middle of the left end of the fixing device 3 is locked with a rubber umbrella skirt head 4 through a fixing bolt 5, the centers of circles of the fixing device 3, the knob 1 and the rubber umbrella skirt head 4 are in the same straight line, and the slot 2 and the knob 1 are concentrically arranged, so that the gas pipeline is conveniently plugged.
Referring to fig. 2 and 3, the present invention provides a device for mounting and dismounting a safety plug of a gas pipeline by improvement, wherein the fixing device 3 includes a support column 31, a threaded joint 32, a rubber ring 33, an outer sealing ring 34 and a support ring 35, the threaded joint 32 is fixed in the middle of the left end of the support column 31, the rubber ring 33 is sleeved on the outer side of the threaded joint 32, the right end of the rubber ring 33 is adhered to the support column 31 to fix the rubber ring 33, the outer sealing ring 34 is sleeved on the outer side of the support column 31, the inner side of the outer sealing ring 34 is in threaded connection with the support column 31, so that the outer sealing ring 34 rotates and moves by being in threaded fit with the support column 31, the support ring 35 is arranged at the right end of the outer side of the support column 31, the movable shell 341 is supported by the support ring 35 to prevent the movable shell 341 from falling out of the right end of the support column 31, the right end of the support column 31 is fixedly connected with a knob 1, the center of the left end of the threaded joint 32 is locked with a rubber umbrella skirt 4 by a fixing bolt 5, fix rubber umbrella skirt 4, support ring 35 is the annular form, and support ring 35 external diameter is greater than activity shell 341 right-hand member internal diameter, supports activity shell 341 through support ring 35, avoids activity shell 341 to fall out from the pillar 31 right-hand member.
Referring to fig. 4 and 5, the present invention provides a dismounting device for a safety plug of a gas pipeline by improvement, wherein an outer sealing ring 34 includes a movable shell 341, a rotating block 342, a sealing inner ring 343 and a spring 344, the rotating block 342 is disposed inside the movable shell 341, the movable shell 341 is sleeved outside the sealing inner ring 343, the right end of the sealing inner ring 343 is elastically connected to the movable shell 341 through the spring 344, the movable shell 341, the sealing inner ring 343 and the spring 344 are all sleeved outside a pillar 31, the inner sealing ring 343 is in threaded connection with the pillar 31, a rubber pad is sleeved on the outer side of the movable shell 341, and anti-skid lines are arranged on the outer side of the rubber pad, the movable shell 341 is anti-skid, two rotating blocks 342 and two convex blocks 3432 are arranged, and the two rotating blocks 342 are disposed at the right side of the protrusion 3432, so that the rotating blocks 342 move leftwards to align with the protrusion 3432, and the protrusion 3432 is further pushed to rotate by the rotation of the rotating blocks 342.
Referring to fig. 6, the present invention provides a dismounting device for a safety plug of a gas pipeline by improving, wherein a sealing inner ring 343 includes a housing 3431, a protrusion 3432, a bearing 3433 and a sealing rubber 3434, the left end of the outer side of the housing 3431 is provided with the protrusion 3432, the inner side of the housing 3431 is embedded with the bearing 3433, the sealing rubber 3434 is adhered to the inner side of the bearing 3433, the sealing rubber 3434 is rotatably connected to the housing 3431 through the bearing 3433, the right side of the inner side of the housing 3431 is sleeved on the outer wall of the support column 31, the housing 3431 is in threaded connection with the support column 31, the movable housing 341 is sleeved on the outer side of the housing 3431, the right end of the housing 3431 is elastically connected to the movable housing 341 through a spring 344, the outer wall of the housing 3431 is smooth, the inner wall of the left end of the movable housing 341 is attached to the housing 3431, the moving track of the movable housing 341 is limited, the outer side of the sealing rubber 3434 is cylindrical, the inner diameter of the sealing rubber 3434 is gradually reduced from left to right, the sealing rubber 3434 moves to seal the gas pipeline, the casing 3431 and the bump 3432 are made of stainless steel, have high hardness and are not easy to rust, and the sealing rubber 3434 is made of nitrile rubber, has high hardness and is not easy to damage.
Example two:
the invention provides a dismounting device for a safety plug of a gas pipeline through improvement, wherein a rubber ring is sleeved on the outer side of a knob 1, transverse anti-skidding lines are arranged on the outer side of the rubber ring, a sealing inner ring 343 and a shell 3431 are concentrically arranged, and the shell 3431, a bearing 3433, sealing rubber 3434 and a strut 31 are concentrically arranged, so that the sealing rubber 3434 and an external gas pipeline are concentrically arranged, and the sealing effect of the sealing rubber 3434 on the gas pipeline is improved.
The invention provides a dismounting device for a safety plug of a gas pipeline through improvement, and the working principle is as follows;
firstly, when a gas pipeline is plugged, inserting a rubber umbrella skirt head 4 into the pipeline, sealing the gas pipeline by a first layer through the rubber umbrella skirt head 4, then rotating a knob 1, driving a threaded joint 32 to rotate through a support column 31 by the knob 1, propelling the threaded joint 32 through the threaded fit between the threaded joint and the gas pipeline, screwing the threaded joint, sealing the right end of the gas pipeline by a sealing ring 33 at the right end of the threaded joint 32, and sealing the gas pipeline by a second layer;
secondly, the movable housing 341 is pressed leftwards, the movable housing 341 presses the strip spring 344 to move leftwards along the outer wall of the housing 3431, since two rotating blocks 342 are arranged in the movable housing 341 and two protrusions 3432 are arranged on the outer side of the housing 3431, and two rotating blocks 342 are arranged on the right side of the protrusion 3432, so that the rotating blocks 342 move leftwards and align with the positions of the protrusions 3432, then the movable housing 341 is rotated, the movable housing 341 pushes the protrusion 3432 through the rotating blocks 342, so that the protrusion 3432 drives the housing 3431 to rotate, the housing 3431 moves leftwards through the screw thread fit between the pillars 31, the housing 3431 drives the inner bearing 3433 and the sealing rubber 3434 to move leftwards, since the outer side of the sealing rubber 3434 is cylindrical and the inner diameter of the sealing rubber 3434 is gradually reduced from left to right, so that the sealing rubber 3434 moves leftwards to seal the gas pipe, the gas pipe is sealed by performing third layer sealing, so as to increase the sealing effect of sealing on the gas pipe, the sealing rubber 3434 is rotatably connected with the housing 3431 through the bearing 3433, the sealing rubber 3434 is prevented from being damaged due to the rotation friction with the gas pipeline;
thirdly, the shell 3431 can be rotated only by pressing the movable shell 341 to align the positions of the rotating block 342 and the bump 3432, so that the shell 3431 is prevented from being easily loosened due to easy rotation, the sealing effect on the gas pipeline is prevented from being affected, and the gas pipeline is sealed in three layers, so that the sealing effect on the gas pipeline is greatly increased;
fourthly, when the plug is disassembled, the plug can be pulled out by only pressing the movable shell 341 and then reversely rotating to loosen the sealing of the sealing rubber 3434 on the pipeline, and then reversely rotating the knob 1 to complete the disassembly, the disassembly and the assembly are convenient, and the use is simple.
The invention provides a dismounting device for a safety plug of a gas pipeline through improvement, a fixing device 3 is arranged, the fixing device 3 is in threaded connection with the gas pipeline through a threaded joint 32 to plug the gas pipeline, an outer sealing ring 34 is arranged on the outer side of the fixing device 3, sealing rubber 3434 on the inner side of the outer sealing ring 34 is sleeved on the outer side of the gas pipeline to seal the gas pipeline in a double-layer manner, the sealing effect on the gas pipeline is increased, a movable shell 341 is arranged on the outer side of a shell 3431 of the outer sealing ring 34 and is supported by a spring 344, a rotating block 342 and a lug 3432 are arranged on the outer side of the shell 3431 and the inner side of the movable shell 341, the rotating block 342 and the lug 3432 can rotate only by pressing the movable shell 341 to align the positions, the shell 3431 is prevented from easily rotating to be easily loosened, the sealing effect on the gas pipeline is influenced, and the sealing effect on the gas pipeline is increased, and the disassembly and the assembly are convenient, and the use is simple.
The basic principles and main features of the present invention and the advantages of the present invention have been shown and described, and the standard parts used in the present invention are all available on the market, the special-shaped parts can be customized according to the description and the accompanying drawings, the specific connection mode of each part adopts the conventional means of bolt and rivet, welding and the like mature in the prior art, the machinery, parts and equipment adopt the conventional type in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, and the details are not described herein.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A dismounting device for a safety plug of a gas pipeline comprises a knob (1), wherein the middle part of the right end of the knob (1) is provided with a slot (2);
the method is characterized in that: the rubber umbrella skirt structure is characterized by further comprising a fixing device (3), the left end of the knob (1) is fixedly connected with the fixing device (3), the middle of the left end of the fixing device (3) is mutually locked with the rubber umbrella skirt head (4) through a fixing bolt (5), the fixing device (3) comprises a support column (31), a threaded joint (32), a rubber ring (33), an outer sealing ring (34) and a support ring (35), the threaded joint (32) is fixed in the middle of the left end of the support column (31), the rubber ring (33) is sleeved on the outer side of the threaded joint (32), the right end of the rubber ring (33) is mutually bonded with the support column (31), the outer sealing ring (34) is sleeved on the outer side of the support column (31), the inner side of the outer sealing ring (34) is in threaded connection with the support column (31), the support ring (35) is arranged on the right end of the outer side of the support column (31), and the right end of the support column (31) is fixedly connected with the knob (1), the left end circle center of the threaded joint (32) is locked with a rubber umbrella skirt head (4) through a fixing bolt (5), the outer sealing ring (34) comprises a movable shell (341), a rotating block (342), a sealing inner ring (343) and a spring (344), the rotating block (342) is arranged on the inner side of the movable shell (341), the movable shell (341) is sleeved on the outer side of the sealing inner ring (343), the right end of the sealing inner ring (343) is elastically connected with the movable shell (341) through the spring (344), the movable shell (341), the sealing inner ring (343) and the spring (344) are all sleeved on the outer side of a strut (31), the sealing inner ring (343) is in threaded connection with the strut (31), the sealing inner ring (343) comprises a shell (3431), a bump (3432), a bearing (3433) and sealing rubber (3434), and the left end of the outer side of the shell (3431) is provided with the bump (3432), the bearing (3433) is embedded into the inner side of the outer shell (3431), the sealing rubber (3434) is bonded to the inner side of the bearing (3433), the outer wall of the support column (31) is sleeved on the right side of the inner portion of the outer shell (3431), the outer shell (3431) is in threaded connection with the support column (31), the movable shell (341) is sleeved on the outer side of the outer shell (3431), and the right end of the outer shell (3431) is elastically connected with the movable shell (341) through the spring (344).
2. The dismounting device for the safety plug of the gas pipeline according to the claim 1 is characterized in that: the circle centers of the fixing device (3), the knob (1) and the rubber umbrella skirt head (4) are in the same straight line, and the slot (2) and the knob (1) are arranged concentrically.
3. The dismounting device for the safety plug of the gas pipeline according to claim 1, characterized in that: the support ring (35) is annular, and the outer diameter of the support ring (35) is larger than the inner diameter of the right end of the movable shell (341).
4. The dismounting device for the safety plug of the gas pipeline according to claim 1, characterized in that: a layer of rubber pad is sleeved on the outer side of the movable shell (341), and anti-skid grains are arranged on the outer side of the rubber pad.
5. The dismounting device for the safety plug of the gas pipeline according to the claim 1 is characterized in that: the number of the rotating blocks (342) and the number of the bumps (3432) are two, and the two rotating blocks (342) are arranged on the right side of the bump (3432).
6. The dismounting device for the safety plug of the gas pipeline according to claim 1 is characterized in that: the outer wall of the outer shell (3431) is smooth, and the inner wall of the left end of the movable shell (341) is attached to the outer shell (3431).
7. The dismounting device for the safety plug of the gas pipeline according to the claim 1 is characterized in that: the sealing inner ring (343) and the outer shell (3431) are arranged concentrically, and the outer shell (3431), the bearing (3433), the sealing rubber (3434) and the strut (31) are arranged concentrically.
8. The dismounting device for the safety plug of the gas pipeline according to the claim 1 is characterized in that: the outer side of the sealing rubber (3434) is cylindrical, and the inner diameter of the sealing rubber (3434) is gradually reduced from left to right.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110546227.6A CN113431979B (en) | 2021-08-18 | 2021-08-18 | Dismounting device for safety plug of gas pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110546227.6A CN113431979B (en) | 2021-08-18 | 2021-08-18 | Dismounting device for safety plug of gas pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113431979A CN113431979A (en) | 2021-09-24 |
| CN113431979B true CN113431979B (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110546227.6A Active CN113431979B (en) | 2021-08-18 | 2021-08-18 | Dismounting device for safety plug of gas pipeline |
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| CN (1) | CN113431979B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628520A (en) * | 2019-10-08 | 2021-04-09 | 中国石油化工股份有限公司 | High-pressure self-tightening pipeline plugging device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9982826B1 (en) * | 2015-01-28 | 2018-05-29 | Danco, Inc. | Universal plug |
| US9746088B2 (en) * | 2015-12-30 | 2017-08-29 | Tdw Delaware, Inc. | Device for sealing pipelines |
| CN107906299B (en) * | 2017-11-15 | 2019-06-25 | 西华大学 | A kind of pipeline inside capping tools |
| CN208397713U (en) * | 2018-06-28 | 2019-01-18 | 蒋晗 | A kind of gas pipeline multifunctional safe plug |
| CN109931458B (en) * | 2019-01-03 | 2021-01-05 | 哈尔滨学院 | Water-closing test plug for interior decoration |
| CN210623551U (en) * | 2019-10-13 | 2020-05-26 | 浙江海普管业有限公司 | Water pressure sealed waterproof rubber ring |
| CN212107453U (en) * | 2020-04-17 | 2020-12-08 | 天津市华钡燃气热力工程设计有限公司 | Gas engineering pipeline plugging device |
| CN212718655U (en) * | 2020-07-14 | 2021-03-16 | 巩本营 | Pipe orifice plugging device for intermittent period of gas pipeline construction |
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2021
- 2021-08-18 CN CN202110546227.6A patent/CN113431979B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628520A (en) * | 2019-10-08 | 2021-04-09 | 中国石油化工股份有限公司 | High-pressure self-tightening pipeline plugging device |
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