CN111810762A - Pipeline plugging device - Google Patents
Pipeline plugging device Download PDFInfo
- Publication number
- CN111810762A CN111810762A CN202010640014.5A CN202010640014A CN111810762A CN 111810762 A CN111810762 A CN 111810762A CN 202010640014 A CN202010640014 A CN 202010640014A CN 111810762 A CN111810762 A CN 111810762A
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- arc
- ring
- guide
- shaped part
- shaped
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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
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/1612—Devices for covering leaks in pipes or hoses, e.g. hose-menders by means of a plug
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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
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention relates to a pipeline plugging device which comprises a supporting rod, an expansion ring and a sealing cover, wherein the right end of the supporting rod is provided with a fixing ring, and the middle part of the supporting rod is provided with a sliding ring; the expansion ring comprises a first arc-shaped part and a second arc-shaped part which are alternately distributed along the circumferential direction, the first arc-shaped part is provided with a guide part, the side surfaces of the guide part, corresponding to the two ends of the first arc-shaped part, are guide surfaces, a sliding groove is arranged on each guide surface, guide holes are formed in the two side walls of each sliding groove, the guide holes on the adjacent first arc-shaped parts form a splayed shape, the second arc-shaped part is provided with a support lug, each support lug is correspondingly hinged with a fixed ring and a sliding ring through a first connecting rod and a second connecting rod, the two ends of the second arc-shaped part are respectively provided with a sliding block in each sliding groove, and the two; the sealing cover is sleeved on the expansion ring from right to left and is respectively fixedly connected with the first arc-shaped part. The pipeline plugging device has the advantages of simple structure, convenience in operation and control, reliability in plugging and high adaptability, and constant-diameter holes do not need to be formed in the pipeline, so that the operation efficiency is improved.
Description
Technical Field
The invention relates to a plugging device, in particular to a pipeline plugging device for plugging an opening of a gas pipeline.
Background
In the process of connecting, cutting and changing the gas pipe network, the operation of opening holes and plugging is frequently needed. The plugging machine adopted in the field at present mainly performs pipeline plugging through an expansion cylinder, and the practical application of the plugging machine has the following problems: 1. the pipeline is required to be provided with the equal-diameter holes, namely the pipeline is completely cut off, otherwise, the pipeline cannot be plugged through the expansion cylinder; 2. the difficulty and the workload for forming the equal-diameter holes are relatively large, so that the operation efficiency is influenced; 3. the expansion cylinder requires a high matching degree of the equal-diameter hole, so that the plugging is not tight frequently, and the plugging reliability and the operation safety are affected.
Disclosure of Invention
The invention aims to provide a pipeline plugging device which has the advantages of simple structure, convenience in operation and control, reliability in plugging and strong adaptability, and equal-diameter holes do not need to be formed in a pipeline, so that the hole opening difficulty is reduced, and the operation efficiency is improved.
In order to solve the problems in the prior art, the pipeline plugging device provided by the invention comprises a supporting rod, an expansion ring and a sealing cover, wherein a fixing ring is arranged at the right end of the supporting rod, and a sliding ring is arranged in the middle of the supporting rod; the expansion ring is coaxial with the supporting rod, the expansion ring comprises a first arc-shaped part and a second arc-shaped part which are alternately distributed along the circumferential direction, a guide part is arranged on the inner side of the first arc-shaped part, the side faces of the guide part, corresponding to the two ends of the first arc-shaped part, are obliquely arranged and are symmetrically distributed, a sliding groove is arranged on the guide surface, strip-shaped guide holes are formed in the two side walls of the sliding groove, the guide holes in the adjacent first arc-shaped parts form a splayed shape, a support lug is arranged in the middle of the inner side of the second arc-shaped part and is correspondingly hinged with a fixed ring and a sliding ring through a first connecting rod and a second connecting rod, two ends of the second arc-shaped part are respectively provided with a sliding block in the sliding groove; the sealing cover is sleeved on the expansion ring from right to left and is fixedly connected with the first arc-shaped part respectively.
Further, the pipeline plugging device provided by the invention is characterized in that the end surface of the first arc-shaped part is flush with the guide surface, the sliding groove penetrates through the first arc-shaped part, the end surface of the second arc-shaped part is attached to the end surface of the first arc-shaped part, and the sliding block is flush with the outer arc surface of the second arc-shaped part.
Furthermore, the pipeline plugging device is characterized in that two guide posts are arranged on two sides of the sliding block respectively, and shaft sleeves are sleeved on the guide posts.
Further, the pipeline plugging device is characterized in that an axial guide groove is formed in the inner wall of the sliding ring, and a guide rail in the guide groove is arranged on the support rod.
Further, the pipe plugging device of the invention is characterized in that the support rod is provided with a stop ring at the left side position of the slip ring.
Further, the right end of the supporting rod is provided with a positioning disc, and the middle of the sealing cover is fixedly connected with the positioning disc.
Further, the pipeline plugging device is characterized in that hinge columns are symmetrically distributed on the sliding ring, and a U-shaped hinge seat is arranged at the left end of the supporting rod.
Further, the pipeline plugging device is characterized in that the number of the first arc-shaped parts and the number of the second arc-shaped parts are four.
Further, the pipeline plugging device is characterized in that the supporting rod is of a hollow tubular structure, and the sealing cover is made of rubber materials.
Compared with the prior art, the pipeline plugging device has the following advantages: the invention sets a support rod, an expansion ring and a sealing cover, wherein the right end of the support rod is provided with a fixed ring, and the middle part of the support rod is provided with a slip ring; the expansion ring and the support rod are coaxially arranged, the expansion ring is provided with a first arc-shaped part and a second arc-shaped part which are alternately distributed along the circumferential direction, the inner side of the first arc-shaped part is provided with a guide part, the guide part and the side face corresponding to the two ends of the first arc-shaped part form a guide surface which is obliquely arranged and symmetrically distributed, the guide surface is provided with a sliding groove, two side walls of the sliding groove are provided with elongated guide holes, the guide holes on the adjacent first arc-shaped parts form a splayed shape, the middle part of the inner side of the second arc-shaped part is provided with a support lug, the support lug is correspondingly hinged with a fixed ring and a sliding ring through a first connecting rod and a second connecting rod, the two ends of the second arc-shaped part are respectively provided with a sliding block in the sliding groove, and the two sides of; and the sealing cover is sleeved on the expansion ring from right to left and is fixedly connected with the first arc-shaped part respectively. Thus, the pipeline plugging device is formed. In practical application, firstly, the sliding ring is moved leftwards to enable the expansion ring and the sealing cover to be in a contraction state; then the plugging device is placed into the pipeline from the opening of the pipeline; and then the sliding ring is moved rightwards to expand the expansion ring and extrude the sealing cover on the inner wall of the pipeline, so that the aim of plugging the pipeline can be fulfilled. According to the invention, through arranging the expansion ring and the sealing cover, the expansion ring is provided with the first arc-shaped part and the second arc-shaped part which are alternately distributed along the circumferential direction, a relative sliding structure is arranged between the first arc-shaped part and the second arc-shaped part, and the guide holes on the adjacent first arc-shaped parts form a splayed shape.
The pipe plugging device of the present invention will be described in further detail with reference to the embodiments shown in the drawings.
Drawings
FIG. 1 is a front view of a pipe blanking plug of the present invention;
FIG. 2 is a top view of a pipe plugging device of the present invention;
FIG. 3 is a left body view of a pipe plugging device of the present invention;
FIG. 4 is a right body view of a pipe plugging device of the present invention;
FIG. 5 is a first perspective view of a pipe plugging device of the present invention;
FIG. 6 is a second perspective view of a pipe plugging device of the present invention;
FIG. 7 is a front view of a pipe plugging device of the present invention in an expanded position;
FIG. 8 is a top view of a pipe plugging device of the present invention in its expanded position;
FIG. 9 is a first perspective view of the pipeline plugging device of the present invention in an expanded state;
FIG. 10 is a second perspective view of the pipeline plugging device of the present invention in an expanded position;
FIG. 11 is a front view of a pipeline plugging device according to the present invention as it is retracted;
FIG. 12 is a top view of a pipeline plugging device according to the present invention shown retracted;
FIG. 13 is a first perspective view of a pipeline plugging device of the present invention shown retracted;
FIG. 14 is a second perspective view of the pipeline plugging device of the present invention shown retracted;
FIG. 15 is a front view of a first arcuate member of a pipeline plugging device according to the invention;
FIG. 16 is a first perspective view of a first arcuate member of a pipeline plugging device in accordance with the present invention;
FIG. 17 is a second perspective view of a first arcuate member of the pipeline plugging device of the present invention;
FIG. 18 is a front view of a second arcuate member of a pipe blanking plug according to the present invention;
FIG. 19 is a first perspective view of a second arcuate member of a pipeline plugging device in accordance with the present invention;
FIG. 20 is a second perspective view of a second arcuate member of the pipeline plugging device of the present invention;
FIG. 21 is a schematic view of the plugging status of a pipeline plugging device according to the present invention;
in fig. 7 to 14, the sealing cover is hidden to show the structure inside the sealing cover.
Detailed Description
First, it should be noted that, the directional terms such as up, down, left, right, front, rear, etc. described in the present invention are only described with reference to the accompanying drawings for easy understanding, and do not limit the technical solution and the claimed scope of the present invention.
As shown in fig. 1 to 21, the pipe plugging device according to the present invention comprises a support rod 1, an expansion ring 2 and a sealing cover 3. The right end of the support rod 1 is provided with a fixed ring 11, and the middle part of the support rod 1 is sleeved with a sliding ring 12. The expansion ring 2 and the support rod 1 are coaxially arranged, and the expansion ring 2 is provided with a first arc-shaped part 21 and a second arc-shaped part 22 which are alternately distributed along the circumferential direction. The inner side of the first arc-shaped part 21 is provided with a guide part 211, so that the guide part 211 and the corresponding side surface of the two ends of the first arc-shaped part 21 form a guide surface which is obliquely arranged and symmetrically distributed, the guide surface is provided with a sliding chute 212, two side walls of the sliding chute 212 are provided with elongated guide holes 213, and the guide holes 213 on the adjacent first arc-shaped parts 21 form a splayed shape. A support lug 221 is arranged in the middle of the inner side of the second arc-shaped part 22, the support lug 221 is hinged with the fixed ring 11 and the sliding ring 12 through the first connecting rod 4 and the second connecting rod 5, the two ends of the second arc-shaped part 22 are respectively provided with a slide block 222 in the sliding groove 212, and the two sides of the slide block 222 are respectively provided with a guide column 223 in the guide hole 213. The sealing cover 3 is sleeved on the expansion ring 2 from right to left and is fixedly connected with the first arc-shaped part 21 respectively.
The pipeline plugging device with simple structure, convenient operation and control, reliable plugging and strong adaptability is formed by the structure. In practical application, the sliding ring 12 is moved leftwards to enable the expansion ring 2 and the sealing cover 3 to be in a contraction state; then placing the stopper into the pipeline from the opening of the pipeline 100; and then, moving the sliding ring 12 to the right to expand the expansion ring 2 and extrude the sealing cover 3 onto the inner wall of the pipeline, so that the aim of plugging the pipeline can be fulfilled. According to the invention, through arranging the expansion ring 2 and the sealing cover 3, the expansion ring 2 is provided with the first arc-shaped part 21 and the second arc-shaped part 22 which are alternately distributed along the circumferential direction, a relative sliding structure is arranged between the first arc-shaped part 21 and the second arc-shaped part 22, and the guide holes 213 on the adjacent first arc-shaped part 21 form a splayed shape, in the process of moving the sliding ring 12 left and right, the first connecting rod 4 and the second connecting rod 5 can play a role of pulling the second arc-shaped part 22 inwards and outwards, and the purpose of contracting and expanding the expansion ring 2 can be achieved through the relative sliding of the first arc-shaped part 21 and the second arc-shaped part 22. In practical applications, the sealing cover 3 is usually made of rubber material to ensure its extruding and deforming capabilities. In order to improve the stability of the structure and the smoothness of the movement, the present invention generally symmetrically arranges the first connecting rod 4 and the second connecting rod 5, and respectively arranges a U-shaped hinge joint at the end of each of the two. In order to simplify the structure and enhance the structural balance, the present invention generally provides four first arc-shaped parts 21 and four second arc-shaped parts 22, but the present invention is not limited to this, and three or more first arc-shaped parts 21 and four or more second arc-shaped parts 22 may be provided according to actual needs. In addition, it should be noted that the first arc-shaped part 21 and the second arc-shaped part 22 should form a complete ring after the expansion ring 2 is expanded in place, so as to ensure the uniformity of the expansion ring 2 extruding the sealing cover 3, and further improve the reliability of plugging.
As an optimized scheme, the embodiment adopts a structure that the end surface of the first arc-shaped part 21 is flush with the guide surface, and the sliding groove 212 penetrates through the first arc-shaped part 21; at the same time, the end surface of the second arc-shaped part 22 is attached to the end surface of the first arc-shaped part 21, and the slider 222 is flush with the outer arc-shaped surface of the second arc-shaped part 22. The arrangement simplifies the structure, improves the matching degree of the first arc-shaped part 21 and the second arc-shaped part 22, enhances the smoothness of action, realizes seamless butt joint of the outer arc-shaped surfaces of the first arc-shaped part 21 and the second arc-shaped part 22 when the expansion ring 2 is unfolded in place, and enhances the reliability of plugging. In order to enhance the structural stability and smooth operation, the present embodiment provides two guide posts 223 on two sides of the slider 222, and the guide posts 223 are sleeved with the shaft sleeves 224. Meanwhile, in order to avoid the slip ring 12 from deflecting in the moving process, the embodiment has the advantages that the inner wall of the slip ring 12 is provided with the guide groove along the axial direction, the support rod 1 is provided with the guide rail 13 in the guide groove, and the action smoothness of the slip ring 12 is enhanced through the matching of the guide groove and the guide rail 13.
As a specific embodiment, when the expansion ring 2 is contracted to the position, in order to position the sliding ring 12, the present specific embodiment provides the support rod 1 with the stop ring 14 at the left side position of the sliding ring 12. In the embodiment, a positioning disc 15 is further arranged at the right end of the support rod 1, and the middle part of the sealing cover 3 is fixedly connected with the positioning disc 15. The arrangement of the structure can relatively fix the middle part of the sealing cover 3, thereby enhancing the stability of the structure and the air flow impact resistance, but it should be pointed out that a certain deformation allowance is left between the expansion ring 2 and the positioning disc 15 of the sealing cover 3 so as not to influence the contraction and expansion action
In practical application, the invention further provides a first sealing protrusion and a second sealing protrusion on the outer peripheral wall of the sealing cover 3 at a position corresponding to the expansion ring 2, wherein the first sealing protrusion is provided with a plurality of circles at intervals in the axial direction, and the second sealing protrusion is provided with a plurality of circles at intervals in the circumferential direction. The first sealing bulges and the second sealing bulges which are distributed in a staggered mode effectively improve the extrusion deformation capacity of the sealing cover 3, and the adaptability to the inner wall of the pipeline and the reliability of plugging are enhanced. For the convenience of connecting a driving device, the symmetrically distributed hinge columns 121 are arranged on the slip ring 12, for the convenience of connecting a supporting device, the U-shaped hinge base 16 is arranged at the left end of the supporting rod 1, and the driving device and the supporting device are correspondingly arranged in the plugging machine, and are not described again. In order to realize the purpose of reducing weight, the invention leads the support rod 1 to adopt a hollow tubular structure.
The above examples are only for describing the preferred embodiments of the present invention, and do not limit the scope of the claimed invention, and various modifications made by those skilled in the art according to the technical solutions of the present invention should fall within the scope of the invention defined by the claims without departing from the design concept of the present invention.
Claims (9)
1. The pipeline plugging device is characterized by comprising a support rod (1), an expansion ring (2) and a sealing cover (3), wherein a fixing ring (11) is arranged at the right end of the support rod (1), and a sliding ring (12) is arranged in the middle of the support rod (1); the expansion ring (2) is coaxial with the support rod (1), the expansion ring (2) comprises a first arc-shaped part (21) and a second arc-shaped part (22) which are alternately distributed along the circumferential direction, a guide part (211) is arranged on the inner side of the first arc-shaped part (21), the guide part (211) and the side surface corresponding to the two ends of the first arc-shaped part (21) are inclined guide surfaces which are symmetrically distributed, a sliding groove (212) is arranged on the guide surfaces, strip-shaped guide holes (213) are arranged on the two side walls of the sliding groove (212), the guide holes (213) on the adjacent first arc-shaped parts (21) form a splayed shape, a support lug (221) is arranged in the middle of the inner side of the second arc-shaped part (22), the support lug (221) is hinged with the fixed ring (11) and the sliding ring (12) correspondingly through a first connecting rod (4) and a second connecting rod (5), and slide blocks (222) in the sliding groove (212) are respectively arranged, guide posts (223) in the guide holes (213) are respectively arranged on two sides of the sliding block (222); the sealing cover (3) is sleeved on the expansion ring (2) from right to left and is fixedly connected with the first arc-shaped part (21) respectively.
2. The pipe plugging device according to claim 1, wherein the end surface of said first arc-shaped member (21) is flush with the guiding surface, said sliding groove (212) extends through the first arc-shaped member (21), the end surface of said second arc-shaped member (22) is attached to the end surface of the first arc-shaped member (21), and said sliding block (222) is flush with the outer arc-shaped surface of the second arc-shaped member (22).
3. The pipe plugging device according to claim 2, wherein two guide posts (223) are respectively provided on both sides of the sliding block (222), and a bushing (224) is sleeved on each guide post (223).
4. A pipe plugging device according to claim 3, wherein the inner wall of the sliding ring (12) is provided with an axial guide groove, and the support rod (1) is provided with a guide rail (13) in the guide groove.
5. The pipe closure according to any of claims 4, wherein the support bar (1) is provided with a stop ring (14) at the left side of the slip ring (12).
6. The pipe plugging device according to claim 5, wherein a positioning disc (15) is arranged at the right end of the supporting rod (1), and the middle part of the sealing cover (3) is fixedly connected with the positioning disc (15).
7. The pipe plugging device according to any one of claims 1-6, wherein said slip ring (12) is provided with symmetrically distributed hinge columns (121), and the left end of said support rod (1) is provided with a U-shaped hinge seat (16).
8. The pipe blanking device of any one of claims 1-6, wherein there are four of said first arcuate member (21) and said second arcuate member (22), respectively.
9. The pipe plugging device according to any one of claims 1 to 6, wherein said support rod (1) is a hollow tubular structure and said sealing cap (3) is made of rubber material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010640014.5A CN111810762B (en) | 2020-07-06 | 2020-07-06 | Pipeline plugging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010640014.5A CN111810762B (en) | 2020-07-06 | 2020-07-06 | Pipeline plugging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111810762A true CN111810762A (en) | 2020-10-23 |
| CN111810762B CN111810762B (en) | 2021-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010640014.5A Active CN111810762B (en) | 2020-07-06 | 2020-07-06 | Pipeline plugging device |
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| CN (1) | CN111810762B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464761A (en) * | 2021-06-28 | 2021-10-01 | 宁波忻杰燃气用具实业有限公司 | Quick shutoff frock of cutting off |
| CN114526395A (en) * | 2022-03-21 | 2022-05-24 | 北京市燃气集团有限责任公司 | Double-seal pipeline plugging device |
| CN114526394A (en) * | 2022-03-21 | 2022-05-24 | 北京市燃气集团有限责任公司 | Electrically driven pipeline plugging device |
| CN114636044A (en) * | 2022-03-21 | 2022-06-17 | 北京天兴燃气工程有限公司 | Self-guide flow gas pipeline plugging device |
| CN114658949A (en) * | 2022-03-21 | 2022-06-24 | 北京市燃气集团有限责任公司 | Self-diversion double-seal pipeline plugging device |
| CN115143338A (en) * | 2022-03-21 | 2022-10-04 | 北京市燃气集团有限责任公司 | Self-diversion pipeline plugging device based on hydraulic drive |
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| US4693278A (en) * | 1986-11-10 | 1987-09-15 | T. D. Williamson, Inc. | Safety closure member |
| JP2004044625A (en) * | 2002-07-09 | 2004-02-12 | Tanaka Giken Kk | Gas shutoff tool |
| CN201306574Y (en) * | 2008-10-28 | 2009-09-09 | 张杰城 | Pipe end port plugging device |
| US9016320B1 (en) * | 2011-06-30 | 2015-04-28 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Intelligent flow control valve |
| CN103277627B (en) * | 2013-05-30 | 2015-04-15 | 中国石油大学(北京) | Spherical dual-seal plugging device |
| CN204176236U (en) * | 2014-10-13 | 2015-02-25 | 北京市燃气集团有限责任公司 | A kind of fluid line pipe fitting blocking device |
| CN106499908B (en) * | 2016-12-15 | 2018-06-19 | 福州市水务管网维护有限公司 | A kind of expansion type pipe plugging head and its main body mechanism |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464761A (en) * | 2021-06-28 | 2021-10-01 | 宁波忻杰燃气用具实业有限公司 | Quick shutoff frock of cutting off |
| CN114526395A (en) * | 2022-03-21 | 2022-05-24 | 北京市燃气集团有限责任公司 | Double-seal pipeline plugging device |
| CN114526394A (en) * | 2022-03-21 | 2022-05-24 | 北京市燃气集团有限责任公司 | Electrically driven pipeline plugging device |
| CN114636044A (en) * | 2022-03-21 | 2022-06-17 | 北京天兴燃气工程有限公司 | Self-guide flow gas pipeline plugging device |
| CN114658949A (en) * | 2022-03-21 | 2022-06-24 | 北京市燃气集团有限责任公司 | Self-diversion double-seal pipeline plugging device |
| CN114526395B (en) * | 2022-03-21 | 2022-08-23 | 北京市燃气集团有限责任公司 | Double-seal pipeline plugging device |
| CN114658949B (en) * | 2022-03-21 | 2022-09-09 | 北京市燃气集团有限责任公司 | Self-diversion double-seal pipeline plugging device |
| CN115143338A (en) * | 2022-03-21 | 2022-10-04 | 北京市燃气集团有限责任公司 | Self-diversion pipeline plugging device based on hydraulic drive |
| CN114658949B8 (en) * | 2022-03-21 | 2022-11-01 | 北京市燃气集团有限责任公司 | Self-diversion double-seal pipeline plugging device |
| CN115143338B (en) * | 2022-03-21 | 2023-09-12 | 北京市燃气集团有限责任公司 | Hydraulic drive-based self-conduction pipeline plugging device |
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