CN114017095A - Gas spraying treatment device for upper corners of coal mines - Google Patents
Gas spraying treatment device for upper corners of coal mines Download PDFInfo
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- CN114017095A CN114017095A CN202111298683.XA CN202111298683A CN114017095A CN 114017095 A CN114017095 A CN 114017095A CN 202111298683 A CN202111298683 A CN 202111298683A CN 114017095 A CN114017095 A CN 114017095A
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- plate
- conical surface
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- 239000003245 coal Substances 0.000 title claims abstract description 28
- 238000005507 spraying Methods 0.000 title abstract description 14
- 239000007921 spray Substances 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000009434 installation Methods 0.000 claims abstract description 7
- 244000005700 microbiome Species 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 2
- 239000011707 mineral Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 48
- 238000000034 method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Nozzles (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a gas spraying treatment device for an upper corner of a coal mine, and relates to the technical field of mineral exploitation safety. The gas spraying treatment device for the upper corner of the coal mine comprises a shell, wherein the lower end face of the shell is fixedly connected with an installation channel, a second spray nozzle is arranged on the lower side wall of the installation channel, a first spray nozzle is arranged on the inner side face of the lower part of the shell, and an inner supporting plate is fixedly connected to the inner side face of the lower part of the shell; the inner wall department of shell is provided with interior conical surface, shell from the bottom up is located the internal diameter enlargement at interior conical surface, interior conical surface department is provided with the third shower nozzle. The upper plate is driven by the electric push rod to move up and down, and the pushing plate and the sliding plate are indirectly driven to move, so that the inner bag and the elastic cover can be pulled or extruded to deform, and the contact effect of gas and gas treatment liquid is promoted by combining with the additionally provided spray heads at three positions, and the treatment efficiency of the gas can be improved.
Description
Technical Field
The invention relates to the technical field of mineral exploitation safety, in particular to a gas spraying treatment device for an upper corner of a coal mine.
Background
Coal plays an important role in energy supply systems in China, and gas is inevitably generated during coal mining. Coal mine gas is also called coal bed gas and coal bed gas. The mixed gas composed of methane, carbon dioxide and nitrogen, etc. escaped from coal and surrounding rock. The gas is a harmful factor in coal mine production, not only pollutes air, but also causes explosion when encountering fire when the gas content in the air is 5-16 percent, thereby causing accidents.
The upper corner of the return air side of the coal face and the triangular zone close to the upper wall of the return air roadway and the edge of the gob is the place where gas is most easily gathered, and if the gas at the upper corner is not treated, safety accidents are very easy to happen.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a gas spraying treatment device for an upper corner of a coal mine, which solves the problem of gas spraying of the upper corner of the coal mine.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the gas spraying treatment device for the upper corner of the coal mine comprises a shell, wherein the lower end face of the shell is fixedly connected with an installation channel, the lower side wall of the installation channel is provided with a second spray head, the inner side face of the lower part of the shell is provided with a first spray head, and the inner side face of the lower part of the shell is fixedly connected with an inner supporting plate;
an inner conical surface is arranged on the inner wall of the shell, the inner diameter of the shell at the inner conical surface is enlarged from bottom to top, a third spray nozzle is arranged at the inner conical surface, and an air guide channel is arranged on the inner wall of the shell and above the inner conical surface;
an inner cavity is formed in the side wall of the shell, an inner bag is arranged at the bottom of the inner cavity, and a pushing plate is connected to the inner part of the inner cavity in a sliding mode;
the outer side surface of the shell is provided with a side mounting groove, the bottom surface of the side mounting groove is provided with an electric push rod, the output end of the electric push rod is fixedly connected with an upper plate, the lower surface of the upper plate is fixedly connected with a first connecting rod and a funnel head, the lower end of the first connecting rod is fixedly connected with a pushing plate, the lower surface of the funnel head is fixedly connected with a second connecting rod, and the lower end of the second connecting rod is fixedly connected with a sliding plate;
the middle part of the sliding plate is communicated, the outer side of the sliding plate which is communicated with the sliding plate is provided with an upper connecting block which is not connected with the sliding plate, and an elastic cover is fixedly connected between the inner supporting plate and the upper connecting block.
Preferably, the mounting channel is connected with the inner bag through a channel on the lower side wall of the outer shell, and the second spray heads are annularly distributed on the lower side surface of the mounting channel.
Preferably, the first spray heads are annularly distributed along the inner side surface of the outer shell, and the inner support plate is positioned between the first spray heads and the inner conical surface.
Preferably, the air guide channels are annularly distributed along the inner part of the shell, and the lower end faces of the air guide channels penetrate through the upper edge line of the inner conical surface.
Preferably, the first spray head and the third spray head are both connected with the inner bag, and the upper side surface and the lower side surface of the inner bag are respectively fixedly connected with the lower surface of the pushing plate and the inner bottom surface of the inner cavity.
Preferably, the sliding plate is slidably connected with the inner wall of the outer shell above the inner conical surface.
Preferably, the elastic cover is made of rubber materials, and the axis of the funnel head is superposed with the axis of the middle through part of the sliding plate.
Preferably, the bottom surface of the side mounting groove is connected with the inward bag through a pipeline, the other end of the pipeline is connected with a pump body, and an inlet of the pump body is connected with a microorganism gas treatment liquid tank.
Preferably, the lower surface of the sliding plate is fixedly connected with a top column, and the top column is positioned right above the inner conical surface.
The working principle is as follows: the gas treatment liquid in the microorganism gas treatment liquid tank is sent into the inner bag by the pump body through a pipeline, at the moment, the electric push rod drives the upper plate to move upwards, meanwhile, the first connecting rod pulls the pushing plate to drive the inner bag to pull upwards, in addition, the second connecting rod pulls the sliding plate to move upwards, so that the upper connecting block pulls the upper end of the elastic cover upwards, due to the stretching action of the elastic cover, the gap between the elastic cover and the shell is increased, gas can be sucked into the gap between the elastic cover and the shell from the gap between the inner supporting plate and the inner wall of the shell, after the electric push rod drives the upper plate to move downwards, the pump body stops the pumping of the gas treatment liquid, the upper plate pushes the first connecting rod to enable the pushing plate to move downwards so as to enable the pushing plate to press downwards, the gas treatment liquid in the inner bag can be sprayed out from the first spray nozzle, the third spray nozzle and the second spray nozzle connected with the installation channel to treat the gas, and the funnel head is pushed to enable the second connecting rod to move downwards in the process that the upper plate moves downwards, the sliding plate is pushed downwards, so that the gap between the elastic cover and the inner wall of the shell is reduced, the gas sprayed in the gap reaches the through position of the sliding plate in the gap of the upper connecting block, then moves upwards along with the gas sprayed upwards from the inner side of the elastic cover, and finally is discharged upwards through the middle part of the funnel head, the gas guide channel ensures that the gas sprayed can be discharged upwards in the gap between the elastic cover and the inner wall of the shell, and can also provide a channel for gas treatment liquid carried by the gas and condensed into drops to fall onto the sliding plate and flow downwards, and the process is repeated in such a way to realize gas spraying treatment of the upper corner of the coal mine.
(III) advantageous effects
The invention provides a gas spraying treatment device for an upper corner of a coal mine. The method has the following beneficial effects:
1. according to the invention, the upper plate is driven to move up and down by the electric push rod, and the push plate and the sliding plate are indirectly driven to move, so that the inner bag and the elastic cover can be pulled or extruded to deform, and the contact effect of gas and gas treatment liquid is promoted and the gas treatment efficiency can be improved by combining the additionally provided spray heads at three positions.
2. According to the invention, the downward movement of the sliding plate is limited by the top column, so that the sliding plate is prevented from blocking the transition part between the air guide channel and the inner conical surface, and the upward discharge of sprayed gas and the falling of condensed gas treatment liquid are hindered.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a longitudinal sectional view of the present invention;
FIG. 4 is a side view of the present invention;
FIG. 5 is a bottom view of the present invention;
fig. 6 is a horizontal cross-sectional view of the present invention.
Wherein, 1, a shell; 2. an elastic cover; 3. an inner support plate; 4. a first nozzle; 5. a second nozzle; 6. installing a channel; 7. a side mounting groove; 8. an electric push rod; 9. a pump body; 10. a microorganism gas treatment liquid tank; 11. an upper plate; 12. a funnel head; 13. a first link; 14. a second link; 15. an inner cavity; 16. a push plate; 17. a sliding plate; 18. a top pillar; 19. an upper connecting block; 20. a third spray head; 21. an inner conical surface; 22. an inner bag; 23. an air guide channel.
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 by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1-6, an embodiment of the present invention provides a gas spraying treatment device for upper corners of coal mines, including a housing 1, a mounting channel 6 is fixedly connected to a lower end surface of the housing 1, and is used for gas treatment liquid in an inner bag 22 to flow to each second nozzle 5, a second nozzle 5 is arranged on a lower side wall of the mounting channel 6 and is used for spraying the gas treatment liquid downward, the mounting channel 6 is connected to the inner bag 22 through a channel on the lower side wall of the housing 1, the second nozzles 5 are annularly distributed on a lower side surface of the mounting channel 6, a first nozzle 4 is arranged on an inner side surface of a lower portion of the housing 1 and is used for spraying the gas treatment liquid in the housing 1, the first nozzles 4 are annularly distributed along the inner side surface of the housing 1, an inner support plate 3 is fixedly connected to the inner side surface of the lower portion of the housing 1, and the inner support plate 3 is located between the first nozzle 4 and an inner conical surface 21;
the inner wall of the shell 1 is provided with an inner conical surface 21, the inner diameter of the shell 1 at the inner conical surface 21 is enlarged from bottom to top, the inner conical surface 21 is provided with a third spray head 20 for spraying gas treatment liquid upwards, the inner wall of the shell 1 and the upper part of the inner conical surface 21 are provided with gas guide channels 23 for discharging sprayed gas, the gas guide channels 23 are annularly distributed along the inside of the shell 1, the lower end surfaces of the gas guide channels 23 penetrate through the upper edge line of the inner conical surface 21, so that after the top column 18 is pushed against the inner conical surface 21 after the sliding plate 17 moves downwards, the sprayed gas can be discharged, and when the top column 18 is pushed against the inner conical surface 21, the sliding plate 17 leans against the upper edge of the inner conical surface 21;
an inner cavity 15 is formed in the side wall of the shell 1, an inner bag 22 is arranged at the bottom of the inner cavity 15, and a pushing plate 16 is connected to the inner part of the inner cavity 15 in a sliding mode and used for extruding or pulling the inner bag 22;
the outer side surface of the shell 1 is provided with a side mounting groove 7, it is ensured that after the electric push rod 8 is mounted, the outer side of the electric push rod 8 does not exceed the outer side surface of the shell 1, the electric push rod 8 is arranged on the bottom surface of the side mounting groove 7 and is used for driving the upper plate 11 to move up and down, after the upper plate 11 moves, the pushing plate 16 is driven by the first connecting rod 13 to move, after the upper plate 11 drives the funnel head 12 to move the second connecting rod 14, the sliding plate 17 is driven to move up and down, further, the sliding plate 17 drives the elastic cover 2 to deform by the upper connecting block 19, further, the space size between the elastic cover 2 and the inner wall of the shell 1 is changed, the output end of the electric push rod 8 is fixedly connected with the upper plate 11, the lower surface of the upper plate 11 is fixedly connected with the first connecting rod 13 and the funnel head 12, the lower end of the first connecting rod 13 is fixedly connected with the pushing plate 16, the lower surface of the funnel head 12 is fixedly connected with the second connecting rod 14, the lower end of the second connecting rod 14 is fixedly connected with a sliding plate 17, the sliding plate 17 is slidably connected with the inner wall of the shell 1 above the inner conical surface 21, the lower surface of the sliding plate 17 is fixedly connected with a top column 18, and the top column 18 is positioned right above the inner conical surface 21;
the middle part of the sliding plate 17 is penetrated, the outer side of the penetrating sliding plate is provided with an unconnected upper connecting block 19, the gap of the upper connecting block 19 can allow the gas sprayed by the third spray nozzle 20 between the elastic cover 2 and the shell 1 to move upwards from the penetrating part of the middle part of the sliding plate 17, the elastic cover 2 is fixedly connected between the inner supporting plate 3 and the upper connecting block 19, and the elastic cover 2 is made of rubber materials.
The first nozzle 4 and the third nozzle 20 are both connected with an inner bag 22, and the upper and lower side surfaces of the inner bag 22 are respectively fixedly connected with the lower surface of the push plate 16 and the inner bottom surface of the inner cavity 15.
The axis of the funnel head 12 coincides with the axis of the middle through part of the sliding plate 17.
The bottom surface of the side mounting groove 7 is connected with the inner bag 22 through a pipeline, the other end of the pipeline is connected with the pump body 9, the inlet of the pump body 9 is connected with the microorganism gas treatment liquid tank 10, and the pump body 9 is used for sending the microorganism gas treatment liquid tank 1 into the inner bag 22.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A gas sprays treatment device for coal mine upper corner, includes shell (1), its characterized in that: the lower end face of the shell (1) is fixedly connected with an installation channel (6), the lower side wall of the installation channel (6) is provided with a second spray head (5), the inner side face of the lower part of the shell (1) is provided with a first spray head (4), and the inner side face of the lower part of the shell (1) is fixedly connected with an inner support plate (3);
an inner conical surface (21) is arranged on the inner wall of the shell (1), the inner diameter of the shell (1) is enlarged at the position of the inner conical surface (21) from bottom to top, a third spray nozzle (20) is arranged at the position of the inner conical surface (21), and an air guide channel (23) is arranged on the inner wall of the shell (1) and above the inner conical surface (21);
an inner cavity (15) is formed in the side wall of the shell (1), an inner bag (22) is arranged at the bottom of the inner cavity (15), and a pushing plate (16) is connected to the inner part of the inner cavity (15) in a sliding manner;
a side mounting groove (7) is formed in the outer side surface of the shell (1), an electric push rod (8) is arranged on the bottom surface of the side mounting groove (7), an upper plate (11) is fixedly connected to the output end of the electric push rod (8), a first connecting rod (13) and a funnel head (12) are fixedly connected to the lower surface of the upper plate (11), the lower end of the first connecting rod (13) is fixedly connected with a pushing plate (16), a second connecting rod (14) is fixedly connected to the lower surface of the funnel head (12), and a sliding plate (17) is fixedly connected to the lower end of the second connecting rod (14);
the middle part of the sliding plate (17) is through, the outer side of the through sliding plate is provided with an unconnected upper connecting block (19), and an elastic cover (2) is fixedly connected between the inner supporting plate (3) and the upper connecting block (19).
2. A gas spray abatement device for a coal mine upper corner according to claim 1, wherein: the mounting channel (6) is connected with the inner bag (22) through a channel on the lower side wall of the shell (1), and the second spray heads (5) are annularly distributed on the lower side surface of the mounting channel (6).
3. A gas spray abatement device for a coal mine upper corner according to claim 1, wherein: the first spray heads (4) are distributed annularly along the inner side face of the shell (1), and the inner supporting plate (3) is located between the first spray heads (4) and the inner conical surface (21).
4. A gas spray abatement device for a coal mine upper corner according to claim 1, wherein: the air guide channels (23) are annularly distributed along the interior of the shell (1), and the lower end faces of the air guide channels (23) penetrate through the upper edge line of the inner conical surface (21).
5. A gas spray abatement device for a coal mine upper corner according to claim 1, wherein: the first spray head (4) and the third spray head (20) are both connected with the inner bag (22), and the upper side surface and the lower side surface of the inner bag (22) are respectively fixedly connected with the lower surface of the push plate (16) and the inner bottom surface of the inner cavity (15).
6. A gas spray abatement device for a coal mine upper corner according to claim 1, wherein: the sliding plate (17) is connected with the inner wall of the shell (1) above the inner conical surface (21) in a sliding mode.
7. A gas spray abatement device for a coal mine upper corner according to claim 1, wherein: the elastic cover (2) is made of rubber materials, and the axis of the funnel head (12) is superposed with the axis of the middle through part of the sliding plate (17).
8. A gas spray abatement device for a coal mine upper corner according to claim 1, wherein: the bottom surface of the side mounting groove (7) is connected with an inward bag (22) through a pipeline, the other end of the pipeline is connected with a pump body (9), and an inlet of the pump body (9) is connected with a microorganism gas treatment liquid tank (10).
9. A gas spray abatement device for a coal mine upper corner according to claim 1, wherein: the lower surface of the sliding plate (17) is fixedly connected with a top column (18), and the top column (18) is positioned right above the inner conical surface (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111298683.XA CN114017095B (en) | 2021-11-04 | 2021-11-04 | Gas spraying treatment device for upper corners of coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111298683.XA CN114017095B (en) | 2021-11-04 | 2021-11-04 | Gas spraying treatment device for upper corners of coal mine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114017095A true CN114017095A (en) | 2022-02-08 |
| CN114017095B CN114017095B (en) | 2024-04-12 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111298683.XA Active CN114017095B (en) | 2021-11-04 | 2021-11-04 | Gas spraying treatment device for upper corners of coal mine |
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| Country | Link |
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| CN (1) | CN114017095B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201810334U (en) * | 2010-09-28 | 2011-04-27 | 江苏省矿业工程集团有限公司第四工程处 | Air return corner gas system utilizing compressed air spray |
| CN103775127A (en) * | 2013-12-31 | 2014-05-07 | 中国矿业大学 | Method for comprehensively treating gas in low-air-permeability high-gas-content coal seam group |
| CN204511508U (en) * | 2015-03-11 | 2015-07-29 | 杨宏俊 | A kind of gas exceeding limit automatic processing device |
| CN108161066A (en) * | 2017-12-29 | 2018-06-15 | 重庆宏雷机械制造有限公司 | A kind of end axis drilling equipment |
| CN108652956A (en) * | 2018-03-25 | 2018-10-16 | 重庆添与电子商务有限公司 | Push-press type nasal cleaner |
| CN110894794A (en) * | 2019-12-17 | 2020-03-20 | 大同煤矿集团有限责任公司 | Comprehensive treatment method for gas on fully mechanized caving face of three-soft extra-thick coal seam |
| CN113236339A (en) * | 2021-04-19 | 2021-08-10 | 中国煤炭地质总局勘查研究总院 | Gas spraying treatment device for upper corners of coal mines |
-
2021
- 2021-11-04 CN CN202111298683.XA patent/CN114017095B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201810334U (en) * | 2010-09-28 | 2011-04-27 | 江苏省矿业工程集团有限公司第四工程处 | Air return corner gas system utilizing compressed air spray |
| CN103775127A (en) * | 2013-12-31 | 2014-05-07 | 中国矿业大学 | Method for comprehensively treating gas in low-air-permeability high-gas-content coal seam group |
| CN204511508U (en) * | 2015-03-11 | 2015-07-29 | 杨宏俊 | A kind of gas exceeding limit automatic processing device |
| CN108161066A (en) * | 2017-12-29 | 2018-06-15 | 重庆宏雷机械制造有限公司 | A kind of end axis drilling equipment |
| CN108652956A (en) * | 2018-03-25 | 2018-10-16 | 重庆添与电子商务有限公司 | Push-press type nasal cleaner |
| CN110894794A (en) * | 2019-12-17 | 2020-03-20 | 大同煤矿集团有限责任公司 | Comprehensive treatment method for gas on fully mechanized caving face of three-soft extra-thick coal seam |
| CN113236339A (en) * | 2021-04-19 | 2021-08-10 | 中国煤炭地质总局勘查研究总院 | Gas spraying treatment device for upper corners of coal mines |
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| CN114017095B (en) | 2024-04-12 |
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