CN111720161B - Coal mine coal face upper corner gas extraction device - Google Patents
Coal mine coal face upper corner gas extraction device Download PDFInfo
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- CN111720161B CN111720161B CN202010627444.3A CN202010627444A CN111720161B CN 111720161 B CN111720161 B CN 111720161B CN 202010627444 A CN202010627444 A CN 202010627444A CN 111720161 B CN111720161 B CN 111720161B
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- 238000000605 extraction Methods 0.000 title claims abstract description 71
- 239000003245 coal Substances 0.000 title claims abstract description 64
- 239000007789 gas Substances 0.000 claims abstract description 92
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000011261 inert gas Substances 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 description 8
- 238000009423 ventilation Methods 0.000 description 6
- 210000001503 joint Anatomy 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Pipeline Systems (AREA)
Abstract
The invention discloses a gas extraction device for an upper corner of a coal mining working face of a coal mine, which comprises an air extraction pipeline and an air supply pipeline, wherein the air extraction pipeline and the air supply pipeline are fixedly connected through a fixed connecting frame; one end of the air exhaust pipeline is communicated with the filter tank body, the other end of the air exhaust pipeline is communicated with the water storage tank body, and the top end of the water storage tank body is provided with an exhaust pipeline; a plurality of first inclined connecting pipes are arranged on the side surface of the air extraction pipeline, and the included angle between each first inclined connecting pipe and one end, close to the filter box body, of the air extraction pipeline is not more than 75 degrees; one end of the gas supply pipeline extends into the coal face, the other end of the gas supply pipeline is communicated with the inert gas tank, a plurality of second inclined connecting pipes are arranged on the side face of the gas supply pipeline, and the included angle between each second inclined connecting pipe and one end, close to the inert gas tank, of the gas supply pipeline is not more than 75 degrees; the fixed connection frame is provided with a power fan, and an air outlet of the power fan is respectively communicated with the first inclined connection pipe and the second inclined connection pipe through an air outlet pipeline.
Description
Technical Field
The invention relates to the field of coal mines, in particular to a gas extraction device for an upper corner of a coal mining working face of a coal mine.
Background
Coal mines are areas where humans mine coal resources in coal-rich mining areas, and are generally divided into underground coal mines and opencast coal mines. When the coal seam is far from the ground surface, a tunnel is usually dug to the underground, so that the coal is a mineworker coal mine. When the coal seam is very close to the earth surface, the coal is generally excavated by directly stripping the earth surface, which is an open pit coal mine. The vast majority of coal mines in China belong to underground coal mines. Coal mines encompass a large area above ground and below ground as well as associated facilities. Coal mines are reasonable spaces excavated by humans when excavating geological formations rich in coal and generally include roadways, wells, and mining surfaces, among others. Coal is the most predominant solid fuel, one of the flammable organic rocks. It is formed by that the flourishing plants grown in a certain geologic age are gradually piled up into a thick layer in a proper geologic environment, and are buried in the water bottom or silt, and then are subjected to the natural coalification action in a long geologic age. In the geologic periods of the world, most coal is produced in the stratums of the stone charm, the pilaster, the Jurassic and the third era, which is an important coal-forming era. The carbon content of the coal is generally 46-97%, and the coal is brown to black and has dull to metallic luster. According to the degree of coalification, coal can be classified into peat, lignite, bituminous coal and anthracite.
The coal mining working face is a first production site of coal, has the characteristics of narrow operation space, more mechanical equipment, poor visual environment and high temperature, has frequent safety accidents, seriously influences the safety management work of the whole coal mine, and is a key area in the safety management work of the coal mine. The upper corner is generally used in mining terminology and refers to the return air side of the coal face, and is the triangular zone near the upper wall of the return air roadway and the edge of the gob. The ventilation of the area is poor, the temperature and the humidity are high, the gas released by intersection of the goaf and the mining face is easy to accumulate, the gas concentration is high, and the area is the key point for preventing and controlling the gas on the working face.
The existing upper corner gas extraction device uses an air exhaust fan as extraction power, and because an extraction pipeline is long and sometimes even reaches thousands of meters, the suction force of the air exhaust fan is continuously reduced along with the increase of the length, so that the working efficiency of gas extraction operation is seriously reduced.
Disclosure of Invention
The invention aims to solve the problems and provides a coal mine coal face upper corner gas extraction device which is simple in structure and capable of improving extraction efficiency.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a gas extraction device at the upper corner of a coal mining working face of a coal mine comprises an air extraction pipeline and an air supply pipeline, wherein the air extraction pipeline is fixedly connected with the air supply pipeline through a fixed connecting frame; one end of the air exhaust pipeline is communicated with the filter tank body, the other end of the air exhaust pipeline is communicated with the water storage tank body, and the top end of the water storage tank body is provided with an exhaust pipeline; a plurality of first inclined connecting pipes are arranged on the side surface of the air extraction pipeline, the first inclined connecting pipes are communicated with the air extraction pipeline, and the included angle between each first inclined connecting pipe and one end, close to the filter box body, of the air extraction pipeline is not more than 75 degrees; one end of the gas supply pipeline extends into the coal face, the other end of the gas supply pipeline is communicated with the inert gas tank, a plurality of second inclined connecting pipes are arranged on the side face of the gas supply pipeline, the second inclined connecting pipes are communicated with the gas supply pipeline, and the included angle between each second inclined connecting pipe and one end, close to the inert gas tank, of the gas supply pipeline is not more than 75 degrees; and the fixed connecting frame is provided with a power fan, and an air outlet of the power fan is respectively communicated with the first inclined connecting pipe and the second inclined connecting pipe through an air outlet pipeline.
Furthermore, a water flow pipeline is sleeved on the outer side of the air exhaust pipeline, one end of the water flow pipeline is fixedly connected with the filtering box body, the other end of the water flow pipeline is arranged in a sealing mode, a water inlet and a water outlet are formed in the side face of the water flow pipeline, the water inlet is communicated with one end of a water inlet pipeline, and the other end of the water inlet pipeline is communicated with the water storage box body through a water pump; the water outlet is communicated with the water storage tank body through a water outlet pipeline.
Furthermore, one end of the first inclined connecting pipe penetrates through the water flow pipeline and then is communicated with the air exhaust pipeline, the other end of the first inclined connecting pipe is communicated with the air outlet pipeline, and the outer side wall of the first inclined connecting pipe is connected with the side wall of the water flow pipeline in a sealing mode.
Furthermore, all be provided with one-way discharge valve in first slope connecting pipe, the second slope connecting pipe, first slope connecting pipe, second slope connecting pipe all are connected with the air-out pipeline through quick connect joint.
Furthermore, quick connect coupling's one end cup joints in the air-out pipeline end outside and is connected with air-out pipeline lateral wall bearing, and quick connect coupling's other end inside wall is provided with the internal thread and passes through the internal thread and the external screw thread connection who sets up in first slope connecting pipe, second slope connecting pipe end outside.
Furthermore, seal sleeves are sleeved on the first inclined connecting pipe end, the second inclined connecting pipe end and the air outlet pipeline end, the seal sleeves are annular, and a seal groove is formed in one side of each seal sleeve and is embedded in the outer sides of the first inclined connecting pipe end, the second inclined connecting pipe end and the air outlet pipeline end through the seal groove.
Furthermore, the filtering box body is a rectangular box body, one side of the filtering box body is provided with a plurality of first air exhaust through holes, and the other side of the filtering box body is provided with a second air exhaust through hole and is communicated with an air exhaust pipeline through the second air exhaust through hole.
Furthermore, the top end of the water storage tank body is provided with a ventilation plate, the ventilation plate is fixedly connected to the bottom end of the exhaust pipeline, a ventilation through hole is formed in the ventilation plate, and activated carbon particles are placed in the exhaust pipeline above the ventilation plate.
Furthermore, a plurality of first slope connecting pipes are equidistantly arranged on the side surface of the air exhaust pipeline, and a plurality of second slope connecting pipes are equidistantly arranged on the side surface of the air supply pipeline.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the invention, through the design that the plurality of first inclined connecting pipes are arranged on the air exhaust pipeline and are communicated with the air outlet pipeline, when gas extraction operation is carried out, the power fan is started, air blown out from the air outlet of the power fan enters the air exhaust pipeline along the first inclined connecting pipes and moves towards the water storage box body along the air exhaust pipeline, at the moment, negative pressure is generated at one end of the air exhaust pipeline close to the filter box body, gas is sucked into the air exhaust pipeline under the action of the negative pressure and enters the water storage box body after being mixed with the air blown out by the power fan, and the gas is discharged from the air exhaust pipeline at the top end of the water storage box body after passing through water in the water storage box body;
when gas extraction operation is carried out, the gas extraction pipeline can be connected with the plurality of power fans through the plurality of first inclined connecting pipes according to the length of the gas extraction pipeline, so that the gas flow speed in the gas extraction pipeline can meet the use requirement of the gas extraction operation, the condition that the gas extraction efficiency is reduced due to the overlong gas extraction pipeline is avoided, and the working efficiency of the gas extraction operation is effectively improved; meanwhile, after the gas from the gas extraction pipeline passes through the water in the water storage tank body, the pollution components in the gas which can be dissolved in the water, so that the condition that the pollution gas is discharged into the atmosphere to cause environmental pollution is avoided, and the using effect of the invention is improved;
on the other hand, through the design that the gas supply pipeline is arranged and communicated with the inert gas tank, the inert gas in the inert gas tank can be conveyed to the coal face to be mixed with the gas through the principle the same as that of gas extraction, so that the inflammable and explosive performance of the gas is effectively reduced, the stable operation of the gas extraction is ensured, and the use effect of the gas extraction device is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view A of a portion of the present invention;
FIG. 3 is a partial enlarged view B of the present invention;
fig. 4 is a connection structure diagram of the air outlet pipeline and the first inclined connecting pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art without any creative effort, should be included in the protection scope of the present invention.
As shown in fig. 1 to 4, the gas extraction device at the upper corner of the coal mining working face in the embodiment includes an air extraction pipeline 1 and an air supply pipeline 3, wherein the air extraction pipeline 1 and the air supply pipeline 3 are fixedly connected through a fixed connecting frame 8; one end of the air extraction pipeline 1 is communicated with the filtering box body 4, the other end of the air extraction pipeline 1 is communicated with the water storage box body 9, and the top end of the water storage box body 9 is provided with an exhaust pipeline 901;
a plurality of first inclined connecting pipes 5 are arranged on the side surface of the air extraction pipeline 1 at equal intervals, the first inclined connecting pipes 5 are communicated with the air extraction pipeline 1, and the included angle between each first inclined connecting pipe 5 and one end, close to the filter box body 4, of the air extraction pipeline 1 is not more than 75 degrees; one end of the gas supply pipeline 3 extends into the coal mining working face, the other end of the gas supply pipeline 3 is communicated with the inert gas tank 15, a plurality of second inclined connecting pipes 7 are arranged on the side face of the gas supply pipeline 3 at equal intervals, the second inclined connecting pipes 7 are communicated with the gas supply pipeline 3, and the included angle between each second inclined connecting pipe 7 and one end, close to the inert gas tank 15, of the gas supply pipeline 3 is not more than 75 degrees;
and a power fan 13 is arranged on the fixed connecting frame 8, and an air outlet of the power fan 13 is respectively communicated with the first inclined connecting pipe 5 and the second inclined connecting pipe 7 through an air outlet pipeline 14.
According to the invention, through the design that the plurality of first inclined connecting pipes are arranged on the air exhaust pipeline and are communicated with the air outlet pipeline, when gas extraction operation is carried out, the power fan is started, air blown out from the air outlet of the power fan enters the air exhaust pipeline along the first inclined connecting pipes and moves towards the water storage box body along the air exhaust pipeline, at the moment, negative pressure is generated at one end of the air exhaust pipeline close to the filter box body, gas is sucked into the air exhaust pipeline under the action of the negative pressure and enters the water storage box body after being mixed with the air blown out by the power fan, and the gas is discharged from the air exhaust pipeline at the top end of the water storage box body after passing through water in the water storage box body;
when gas extraction operation is carried out, the gas extraction pipeline can be connected with the plurality of power fans through the plurality of first inclined connecting pipes according to the length of the gas extraction pipeline, so that the gas flow speed in the gas extraction pipeline can meet the use requirement of the gas extraction operation, the condition that the gas extraction efficiency is reduced due to the overlong gas extraction pipeline is avoided, and the working efficiency of the gas extraction operation is effectively improved; meanwhile, after the gas from the gas extraction pipeline passes through the water in the water storage tank body, the pollution components in the gas which can be dissolved in the water, so that the condition that the pollution gas is discharged into the atmosphere to cause environmental pollution is avoided, and the using effect of the invention is improved;
on the other hand, through the design that the gas supply pipeline is arranged and communicated with the inert gas tank, the inert gas in the inert gas tank can be conveyed to the coal face to be mixed with the gas through the principle the same as that of gas extraction, so that the inflammable and explosive performance of the gas is effectively reduced, the stable operation of the gas extraction is ensured, and the use effect of the gas extraction device is further improved.
A water flow pipeline 2 is sleeved on the outer side of the air extraction pipeline 1, one end of the water flow pipeline 2 is fixedly connected with the filter box body 4, the other end of the water flow pipeline 2 is arranged in a sealing mode, a water inlet 201 and a water outlet 202 are arranged on the side face of the water flow pipeline 2, the water inlet 201 is communicated with one end of a water inlet pipeline 11, and the other end of the water inlet pipeline 11 is communicated with a water storage box body 9 through a water pump 10; the water outlet 202 is communicated with the water storage tank body 9 through the water outlet pipeline 12.
The design of the water flow pipeline can cool the gas in the air exhaust pipeline through the water in the water flow pipeline, open fire is extinguished when the gas is exploded, secondary damage caused by fire caused by gas explosion is avoided, meanwhile, the water flow pipeline is combined with the water storage tank body to realize water path circulation, no external water source is required to be provided, and the use effect of the invention is improved.
The outer side wall of the first inclined connecting pipe 5 is hermetically connected with the side wall of the water flow pipeline 2. One-way exhaust valves 6 are arranged in the first inclined connecting pipe 5 and the second inclined connecting pipe 7, and the first inclined connecting pipe 5 and the second inclined connecting pipe 7 are connected with an air outlet pipeline 14 through quick connection joints 19. One end of the quick connecting joint 19 is sleeved outside the end of the air outlet pipeline 14 and is connected with a bearing on the outer side wall of the air outlet pipeline 14, and the inner side wall of the other end of the quick connecting joint 19 is provided with an internal thread and is in threaded connection with an external thread arranged outside the ends of the first inclined connecting pipe 5 and the second inclined connecting pipe 7 through the internal thread.
When using quick-operation joint to go out the air duct end, first slope connecting pipe is connected or goes out the air duct end, second slope connecting pipe and connect, only need to contact end between them, then rotatory quick-operation joint who is connected with play air duct end bearing can keep away from the one end of air-out pipeline with quick-operation joint and first slope connecting pipe end or second slope connecting pipe end threaded connection to connection structure steadiness between the two has been guaranteed.
The sealing sleeve is designed to enable the connecting structure of the sealing sleeve, the first inclined connecting pipe end, the second inclined connecting pipe end and the air outlet pipeline end to be more stable, meanwhile, the air tightness is better when the air outlet pipeline end is connected with the first inclined connecting pipe or the second inclined connecting pipe, and the using effect of the air-conditioning system is further improved.
The filtering box body 4 is a rectangular box body, one side of the filtering box body 4 is provided with a plurality of first air exhaust through holes 401, and the other side of the filtering box body 4 is provided with a second air exhaust through hole 402 and is communicated with the air exhaust pipeline 1 through the second air exhaust through hole 402. The design of the filter box body can increase the adsorption area of the air exhaust pipeline, so that the working efficiency of gas extraction operation is further improved, meanwhile, the condition that other impurities are adsorbed into the air exhaust pipeline to block the air exhaust pipeline can be avoided, and the using effect of the gas extraction device is further improved.
The top end of the water storage tank body 9 is provided with a ventilating plate 16, the ventilating plate 16 is fixedly connected to the bottom end of the exhaust pipeline 901, a ventilating through hole 1601 is arranged on the ventilating plate 16, and activated carbon particles 17 are placed in the exhaust pipeline 901 above the ventilating plate 16. The active carbon can adsorb other polluting gases contained in the extracted gas again, so that the gas discharged from the exhaust pipeline is further ensured not to pollute the environment, and the use effect of the invention is improved.
Claims (9)
1. The utility model provides a coal mine coal face upper corner gas drainage device which characterized in that: the gas extraction device comprises an air extraction pipeline and an air supply pipeline, and the air extraction pipeline is fixedly connected with the air supply pipeline through a fixed connecting frame; one end of the air exhaust pipeline is communicated with the filter tank body, the other end of the air exhaust pipeline is communicated with the water storage tank body, and the top end of the water storage tank body is provided with an exhaust pipeline; a plurality of first inclined connecting pipes are arranged on the side surface of the air extraction pipeline, the first inclined connecting pipes are communicated with the air extraction pipeline, and the included angle between each first inclined connecting pipe and one end, close to the filter box body, of the air extraction pipeline is not more than 75 degrees; one end of the gas supply pipeline extends into the coal face, the other end of the gas supply pipeline is communicated with the inert gas tank, a plurality of second inclined connecting pipes are arranged on the side face of the gas supply pipeline, the second inclined connecting pipes are communicated with the gas supply pipeline, and the included angle between each second inclined connecting pipe and one end, close to the inert gas tank, of the gas supply pipeline is not more than 75 degrees; and the fixed connecting frame is provided with a power fan, and an air outlet of the power fan is respectively communicated with the first inclined connecting pipe and the second inclined connecting pipe through an air outlet pipeline.
2. The coal mine coal face upper corner gas extraction device according to claim 1, characterized in that: a water flow pipeline is sleeved on the outer side of the air exhaust pipeline, one end of the water flow pipeline is fixedly connected with the filtering box body, the other end of the water flow pipeline is arranged in a sealing mode, a water inlet and a water outlet are formed in the side face of the water flow pipeline, the water inlet is communicated with one end of a water inlet pipeline, and the other end of the water inlet pipeline is communicated with the water storage box body through a water pump; the water outlet is communicated with the water storage tank body through a water outlet pipeline.
3. The coal mine coal face upper corner gas extraction device according to claim 2, characterized in that: one end of the first inclined connecting pipe penetrates through the water flow pipeline and then is communicated with the air exhaust pipeline, the other end of the first inclined connecting pipe is communicated with the air outlet pipeline, and the outer side wall of the first inclined connecting pipe is hermetically connected with the side wall of the water flow pipeline.
4. The coal mine coal face upper corner gas extraction device according to claim 3, characterized in that: and the first inclined connecting pipe and the second inclined connecting pipe are connected with the air outlet pipeline through quick connecting joints.
5. The coal mine coal face upper corner gas extraction device of claim 4, characterized in that: the one end of quick connect coupling cup joints in the air-out pipeline end outside and is connected with air-out pipeline lateral wall bearing, and quick connect coupling's other end inside wall is provided with the internal thread and passes through the internal thread and set up the external screw thread connection in first slope connecting pipe, second slope connecting pipe end outside.
6. The coal mine coal face upper corner gas extraction device of claim 5, characterized in that: the first inclined connecting pipe end, the second inclined connecting pipe end and the air outlet pipeline end are all sleeved with sealing sleeves, the sealing sleeves are annular, and one side of each sealing sleeve is provided with a sealing groove and is embedded outside the first inclined connecting pipe end, the second inclined connecting pipe end and the air outlet pipeline end through the sealing grooves.
7. The coal mine coal face upper corner gas extraction device of claim 6, characterized in that: the filter box body is a rectangular box body, one side of the filter box body is provided with a plurality of first air exhaust through holes, and the other side of the filter box body is provided with a second air exhaust through hole and is communicated with an air exhaust pipeline through the second air exhaust through hole.
8. The coal mine coal face upper corner gas extraction device according to claim 7, characterized in that: the top end of the water storage box body is provided with a ventilating plate, the ventilating plate is fixedly connected to the bottom end of the exhaust pipeline, a ventilating through hole is formed in the ventilating plate, and activated carbon particles are placed in the exhaust pipeline above the ventilating plate.
9. The coal mine coal face upper corner gas extraction device according to claim 8, characterized in that: the first inclined connecting pipes are arranged on the side face of the air exhaust pipeline at equal intervals, and the second inclined connecting pipes are arranged on the side face of the air supply pipeline at equal intervals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010627444.3A CN111720161B (en) | 2020-07-02 | 2020-07-02 | Coal mine coal face upper corner gas extraction device |
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| CN202010627444.3A CN111720161B (en) | 2020-07-02 | 2020-07-02 | Coal mine coal face upper corner gas extraction device |
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| CN111720161B true CN111720161B (en) | 2021-12-07 |
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| CN112832845B (en) * | 2021-01-11 | 2022-09-02 | 重庆工程职业技术学院 | Gas extraction device and method for upper corner of coal mining working face of coal mine |
| CN114000914B (en) * | 2021-12-07 | 2024-05-03 | 安阳鑫龙煤业（集团）红岭煤业有限责任公司 | Coal mine gas extraction device |
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