CN114382438A - Hole packer for mine gas extraction - Google Patents
Hole packer for mine gas extraction Download PDFInfo
- Publication number
- CN114382438A CN114382438A CN202210074608.3A CN202210074608A CN114382438A CN 114382438 A CN114382438 A CN 114382438A CN 202210074608 A CN202210074608 A CN 202210074608A CN 114382438 A CN114382438 A CN 114382438A
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- CN
- China
- Prior art keywords
- mucus
- grouting
- bag type
- type plug
- bag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000605 extraction Methods 0.000 title claims abstract description 26
- 210000003097 mucus Anatomy 0.000 claims abstract description 72
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 238000002347 injection Methods 0.000 claims abstract description 32
- 239000007924 injection Substances 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims description 10
- 238000005422 blasting Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 11
- 239000003245 coal Substances 0.000 abstract description 9
- 238000007789 sealing Methods 0.000 abstract description 6
- 238000007711 solidification Methods 0.000 abstract description 6
- 230000008023 solidification Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 abstract description 3
- 239000011083 cement mortar Substances 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- 239000011440 grout Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
- F04B49/022—Stopping, starting, unloading or idling control by means of pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a hole packer for mine gas suction, which belongs to the technical field of mine hole packers and comprises an inner bag type plug and an outer bag type plug, wherein a grouting liquid pipe is communicated in the inner bag type plug and the outer bag type plug and is used for conveying grouting liquid, a middle mucus plugging section is formed between the inner bag type plug and the outer bag type plug, a mucus injection pipe is installed on the outer bag type plug and is used for conveying mucus, and the inner end of the mucus injection pipe extends into the middle mucus plugging section and the outer end of the mucus injection pipe extends out of the outer side of the outer bag type plug. According to the invention, the inner side and the outer side are sealed by adopting the bag bags in which the solidification type slurry can be injected, the middle mucus plugging section is formed between the bag bags at the two ends, and the mucus which is not solidified is injected into the middle mucus plugging section, so that the sealing effect of the hole packer on the drilled hole is ensured, the gas extraction concentration and efficiency are improved, and the safe production of a coal mine is ensured.
Description
Technical Field
The invention relates to the technical field of mine hole packers, in particular to a hole packer for mine gas extraction.
Background
At present, a grouting type hole packer is generally adopted to plug a drilled hole during mine gas extraction, and mainly comprises a grouting pipe, a gas drainage pipe, a one-way valve, an explosion valve, a bag, a plug and the like. When the hole packer is used, a grouting pipe of the hole packer is communicated with a grouting pump, the grouting liquid stirred in the stirring barrel enters the grouting pipe and the bag through the grouting pump, the bag is rapidly expanded, the outer diameter of the bag is fastened on the wall of the hole of the coal seam, and holes at two ends of the hole packer are sealed; when pressure reaches, the blast valve explodes, and the grout is full of the part in the middle of two bags, and then realizes that the multilayer is sealed, takes out gas through gas drainage pipe connection gas drainage pipeline and takes out gas. The grouting liquid is usually made of cement mortar, and is solidified and formed after a certain time.
However, the section form of the drill hole is sequentially divided into a crushing area, a plastic area and an elastic curve from the hole wall to the inside of the coal seam, irregular cracks exist in the crushing area and the plastic area, grouting liquid of the existing grouting type hole packer cannot well penetrate into the cracks, the crack distribution and crack development of the coal (rock) body around the drill hole change along with time, and the grouting liquid can be solidified after a period of time and cannot penetrate into newly generated cracks, so that the existing grouting type hole packer has poor sealing effect on the middle section, the problems of poor plugging, air leakage, short circuit in gas extraction and the like can be caused in the gas extraction process, the gas extraction concentration is low, the expected gas extraction effect cannot be achieved, and the safety production of a coal mine is influenced.
Therefore, a new hole packer for mine gas extraction needs to be developed.
Disclosure of Invention
In view of the above, the invention provides a hole packer for mine gas extraction, wherein the inner side and the outer side of the hole packer are plugged by bags into which solidification type slurry can be injected, a middle mucus plugging section is formed between the bags at the two ends, and mucus which does not solidify is injected into the middle mucus plugging section, so that the sealing effect of the hole packer on a drilled hole is ensured, the gas extraction concentration and efficiency are improved, and the safety production of a coal mine is ensured.
In order to solve the technical problem, the invention provides a hole packer for mine gas extraction, which comprises an inner bag type plug and an outer bag type plug, wherein the inner bag type plug and the outer bag type plug are communicated and provided with a grouting liquid pipe, the grouting liquid pipe is used for conveying grouting liquid, a middle mucus plugging section is formed between the inner bag type plug and the outer bag type plug, the outer bag type plug is provided with a mucus injection pipe, the mucus injection pipe is used for conveying mucus, the inner end of the mucus injection pipe extends into the middle mucus plugging section, and the outer end of the mucus injection pipe extends out of the outer side of the outer bag type plug.
Further, the inner bag type plugging adopts an inner bag unit; or the inner side bag type plugging adopts a plurality of inner side bag units, an inner side grouting section is reserved between adjacent inner side bag units, and a grouting liquid pipe in the inner side grouting section is connected with an inner side explosion valve.
Further, an inner one-way valve is mounted on the grouting pipe in the inner bag unit.
Further, the outer bag type plugging adopts an outer bag unit; or the outer bag type plugging adopts a plurality of outer bag units, an outer grouting section is reserved between adjacent outer bag units, and an outer blasting valve is connected to a grouting liquid pipe located in the outer grouting section.
Further, an outer check valve is installed on the grouting pipe in the outer bag unit.
Further, the number of the inner pouch units is 1 to 5.
Further, the number of the outer pocket units is 1 to 5.
Further, the inner bladder unit adopts an annular bladder structure made of a flexible material.
Further, the outer bladder unit adopts an annular bladder structure made of a flexible material.
The technical scheme of the invention has the following beneficial effects:
1. the invention abandons the use of a common grouting pipe for middle section plugging, and can fill tiny cracks and newly generated cracks in time under the condition of continuous pressurization by utilizing the characteristics of high permeability, viscous liquid plugging property and no solidification of viscous liquid conveyed by a viscous liquid injection pipe, thereby ensuring the sealing effect of a drill hole, improving the gas extraction concentration and efficiency and ensuring the safe production of a coal mine.
2. The invention cancels a blast valve used in the middle mucus plugging section in the traditional two-plugging and one-injection process, and utilizes the mucus injection pipe to inject mucus with high permeability, mucus plugging property and no solidification into the middle mucus plugging section formed between the inner bag type plugging and the outer bag type plugging, thereby ensuring that the mucus is filled in small cracks and newly generated cracks in time and improving the sealing effect of the drilled hole.
3. The mucus in the invention has the characteristic of no solidification, the pressure of the mucus in the middle mucus plugging section can be monitored in real time by using the pressure gauge in a mode of arranging the pressure gauge at the outlet of the mucus injection pump, when the pressure detected by the pressure gauge is reduced and the pressure reduction value reaches a set value, the mucus injection pump is automatically started to supplement the mucus to the middle mucus plugging section, and when the pressure detected by the pressure gauge reaches the set pressure, the mucus injection pump automatically stops working, so that the middle mucus plugging section is always in a state of being filled with the mucus; after the middle mucus plugging section is filled with mucus, the hole sealing effect can be further improved by keeping the middle mucus plugging section under a certain pressure, and the pressure keeping value is specifically set according to the operation requirement and is generally 1-5 MPa.
Drawings
FIG. 1 is a schematic structural diagram of the present invention;
FIG. 2 is another schematic structural view of the present invention;
reference numerals:
an inner side bag type occlusion 100; an inboard grouting segment 110; an inboard burst valve 120; an inboard check valve 130; an outer pocket occlusion 200; an outer grouting section 210; an outboard burst valve 220; an outboard check valve 230; a grouting pipe 300; an intermediate mucus plugging section 400; and a mucus filling tube 500.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1-2 of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
As shown in fig. 1 and 2: a hole packer for mine gas extraction comprises an inner bag type plug and an outer bag type plug, wherein a grouting liquid pipe is communicated with the inner bag type plug and the outer bag type plug and used for conveying solidified grouting liquid, a middle mucus plugging section is formed between the inner bag type plug and the outer bag type plug, a mucus injection pipe is installed on the outer bag type plug, the inner end of the mucus injection pipe extends into the middle mucus plugging section, and the outer end of the mucus injection pipe extends out of the outer side of the outer bag type plug.
Specifically, as shown in fig. 1, the hole packer for mine gas extraction includes an inner bag type plug 100 and an outer bag type plug 200, the inner bag type plug 100 and the outer bag type plug 200 are connected to each other by a grouting pipe 300, the grouting pipe 300 is used for conveying solidified grouting liquid, an intermediate viscous liquid plugging section 400 is formed between the inner bag type plug 100 and the outer bag type plug 200, the outer bag type plug 200 is provided with a viscous liquid injection pipe 500, the viscous liquid injection pipe 500 is used for conveying viscous liquid, an inner end of the viscous liquid injection pipe 500 extends into the intermediate viscous liquid plugging section 400, and an outer end of the viscous liquid injection pipe 500 extends out of the outer bag type plug 200.
According to one embodiment of the present invention, as shown in figure 1, the inner bladder type closure 100 employs an inner bladder unit. The inner bag unit is made of an annular bag structure made of a flexible material, the flexible material is nylon cloth, and other flexible materials such as rubber or canvas cloth can be adopted.
According to one embodiment of the present invention, as shown in fig. 1, an inner check valve 130 is installed on a grout pipe 300 located in an inner bag unit.
According to one embodiment of the present invention, as shown in fig. 1, the outer bladder type occlusion 200 employs an outer bladder unit. The outer bag unit is of an annular bag structure made of a flexible material, the flexible material is nylon cloth, and other flexible materials such as rubber or canvas cloth can be adopted.
According to one embodiment of the present invention, as shown in fig. 1, an outer check valve 230 is installed on the grout pipe 300 located in the outer bag unit.
According to another embodiment of the present invention, as shown in fig. 2, the inner bag type plug 100 uses 2 inner bag units, an inner grouting section 110 is left between adjacent inner bag units, and an inner burst valve 120 is connected to a grouting pipe 300 located in the inner grouting section 110. In this embodiment, the inner bag-type closure 100 uses 2 inner bag units, but obviously, more inner bag units, such as 3, 4, or 5, may be used for the inner bag-type closure 100.
According to another embodiment of the present invention, as shown in fig. 2, the outer bag type plug 200 uses 2 outer bag units, an outer grouting section 210 is left between adjacent outer bag units, and an outer burst valve 220 is connected to a grouting pipe 300 located in the outer grouting section 210. In this embodiment, the outer bag-type plug 200 uses 2 outer bag units, and obviously, the outer bag-type plug 200 may also use more outer bag units, such as 3, 4, or 5 units.
The working method (or working principle) of the invention is as follows:
the invention adopts two plugs in the traditional 'two plugs and one injection' to form the middle mucus plugging section between the two plugs, cancels the structure of injecting slurry into the middle mucus plugging section by adopting a blast valve, and optimizes the structure of injecting mucus into the middle mucus plugging section by adding a mucus injection pipe. When the grouting device is used, the grouting pipe is communicated with a grouting pump, the grouting liquid stirred in the stirring barrel enters the grouting pipe, the inner side bag and the outer side bag through the grouting pump, the bags expand rapidly, the outer diameters of the bags are fastened on the wall of the coal seam hole, and holes at two ends of a drilled hole are sealed; stopping grouting and plugging the grouting pipe when the pressure is reached; connecting the mucus injection tube with a mucus injection pipeline, a pressure gauge and a mucus injection pump; injecting the prepared and stirred mucus into the middle sections plugged by the two bags through a pipeline system connected with the mucus injection pump to ensure that the mucus fully permeates into the cracks, filling the middle sections to reach certain pressure, automatically stopping the work of the mucus injection pump, keeping certain pressure in the middle mucus plugging sections, and completing plugging of drilled holes. When a new crack is formed, mucus permeates into the new crack, the pressure of the middle section is reduced, the mucus injection pump automatically starts grouting until the pressure in the middle mucus plugging section is recovered again, the whole system stops working, and waits for next mucus supplement, so that the high-quality plugging effect is effectively ensured, the gas extraction effect is ensured, and the safety production of a coal mine is ensured.
In addition, although multi-bag type plugging is available at present, common cement mortar type solidification grouting liquid is injected into the bag and between the adjacent bags, and the common grouting liquid is solidified after a period of time, so that a newly generated gap cannot be plugged, and the plugging effect is poor. Specifically, the inside bag type plugging of the invention can adopt a plurality of inside bag units, an inside grouting section is reserved between adjacent inside bag units, and a grouting liquid pipe in the inside grouting section is connected with an inside explosion valve; meanwhile, the outer bag type plugging also adopts a plurality of outer bag units, a grouting section is reserved between adjacent outer bag units, and a grouting liquid pipe in the grouting section is connected with an outer blasting valve; after the inner bag type plug and the outer bag type plug adopt the structure of the multi-bag unit, common cement mortar grouting liquid can be injected into the inner bag unit and the outer bag unit before mucus is injected into the middle mucus plugging section, when the pressure in the inner bag unit and the outer bag unit respectively reaches the pressure value of an inner blasting valve between two adjacent inner bag units and an outer blasting valve between two adjacent outer bag units, the inner bag unit and the outer bag unit are broken, the grouting liquid can enter an inner grouting section between two adjacent inner bag units and an outer grouting section between two adjacent outer bag units until the inner grouting section and the outer grouting section are filled and pressure-maintained, the invention breaks the traditional idea of plugging by adopting common cement mortar grouting liquid, skillfully combines the two ends of the common grouting liquid plug with the middle mode of the non-solidified mucus plugging, the plugging effect is greatly improved, and plugging is reliable.
In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A hole packer for mine gas extraction is characterized in that: the inner side bag type plug (100) and the outer side bag type plug (200) are communicated, a grouting liquid pipe (300) is arranged in the inner side bag type plug (100) and the outer side bag type plug (200) in a communicating mode, the grouting liquid pipe (300) is used for conveying grouting liquid, a middle mucus plugging section (400) is formed between the inner side bag type plug (100) and the outer side bag type plug (200), a mucus injection pipe (500) is installed on the outer side bag type plug (200), the mucus injection pipe (500) is used for conveying mucus, the inner end of the mucus injection pipe (500) extends into the middle mucus plugging section (400), and the outer end of the mucus injection pipe extends out of the outer side bag type plug (200).
2. The hole packer for mine gas extraction according to claim 1, wherein: the inner bag type plugging (100) adopts an inner bag unit; or the inner bag type plugging device (100) adopts a plurality of inner bag units, an inner grouting section (110) is reserved between the adjacent inner bag units, and an inner blasting valve (120) is connected to a grouting pipe (300) positioned in the inner grouting section (110).
3. The hole packer for mine gas extraction according to claim 2, wherein: an inner check valve (130) is mounted on a grouting pipe (300) located in the inner bag unit.
4. The hole packer for mine gas extraction according to claim 1, wherein: the outer bag type plugging (200) adopts an outer bag unit; or the outer bag type plugging device (200) adopts a plurality of outer bag units, an outer grouting section (210) is reserved between the adjacent outer bag units, and an outer blasting valve (220) is connected to a grouting pipe (300) positioned in the outer grouting section (210).
5. The hole packer for mine gas extraction according to claim 4, wherein: an outer check valve (230) is installed on the grouting pipe (300) in the outer bladder unit.
6. The hole packer for mine gas extraction according to claim 2, wherein: the number of the inner bag units is 1 to 5.
7. The hole packer for mine gas extraction according to claim 4, wherein: the number of the outer pocket units is 1 to 5.
8. The hole packer for mine gas extraction according to claim 2, wherein: the inner bag unit adopts an annular bag structure made of flexible materials.
9. The hole packer for mine gas extraction according to claim 4, wherein: the outer bag unit is of an annular bag structure made of flexible materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210074608.3A CN114382438A (en) | 2022-01-21 | 2022-01-21 | Hole packer for mine gas extraction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210074608.3A CN114382438A (en) | 2022-01-21 | 2022-01-21 | Hole packer for mine gas extraction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114382438A true CN114382438A (en) | 2022-04-22 |
Family
ID=81203980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210074608.3A Pending CN114382438A (en) | 2022-01-21 | 2022-01-21 | Hole packer for mine gas extraction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114382438A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020030398A1 (en) * | 2000-03-13 | 2002-03-14 | Drake Ronald D. | Method and system for mining hydrocarbon-containing materials |
| WO2012155696A1 (en) * | 2011-05-13 | 2012-11-22 | 中国矿业大学 | High-pressure resistant drilled hole sealing method |
| CN103352675A (en) * | 2013-07-01 | 2013-10-16 | 陕西煤业化工技术研究院有限责任公司 | Gas extraction, drilling and sealing device and method |
| CN109339736A (en) * | 2018-12-19 | 2019-02-15 | 河南理工大学 | A kind of mash gas pumping drilling solid-liquid two-phase hole sealing device and technique |
| CN214330681U (en) * | 2021-01-22 | 2021-10-01 | 山西保海科技有限责任公司 | Three-blocking two-injection hole packer for coal mine gas extraction drill hole |
| CN114320206A (en) * | 2022-01-18 | 2022-04-12 | 平顶山市安泰华矿用安全设备制造有限公司 | Mining gas drainage hole sealing system |
-
2022
- 2022-01-21 CN CN202210074608.3A patent/CN114382438A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020030398A1 (en) * | 2000-03-13 | 2002-03-14 | Drake Ronald D. | Method and system for mining hydrocarbon-containing materials |
| WO2012155696A1 (en) * | 2011-05-13 | 2012-11-22 | 中国矿业大学 | High-pressure resistant drilled hole sealing method |
| CN103352675A (en) * | 2013-07-01 | 2013-10-16 | 陕西煤业化工技术研究院有限责任公司 | Gas extraction, drilling and sealing device and method |
| CN109339736A (en) * | 2018-12-19 | 2019-02-15 | 河南理工大学 | A kind of mash gas pumping drilling solid-liquid two-phase hole sealing device and technique |
| CN214330681U (en) * | 2021-01-22 | 2021-10-01 | 山西保海科技有限责任公司 | Three-blocking two-injection hole packer for coal mine gas extraction drill hole |
| CN114320206A (en) * | 2022-01-18 | 2022-04-12 | 平顶山市安泰华矿用安全设备制造有限公司 | Mining gas drainage hole sealing system |
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