CN206888947U - Coal bed drilling gas measurement system - Google Patents
Coal bed drilling gas measurement system Download PDFInfo
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- CN206888947U CN206888947U CN201720810999.5U CN201720810999U CN206888947U CN 206888947 U CN206888947 U CN 206888947U CN 201720810999 U CN201720810999 U CN 201720810999U CN 206888947 U CN206888947 U CN 206888947U
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- 238000005259 measurement Methods 0.000 title claims abstract description 61
- 239000003245 coal Substances 0.000 title claims abstract description 37
- 238000005553 drilling Methods 0.000 title claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 88
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 239000000945 filler Substances 0.000 claims abstract description 10
- 238000007569 slipcasting Methods 0.000 claims description 13
- 239000002775 capsule Substances 0.000 claims description 7
- 229920000768 polyamine Polymers 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 70
- 239000000523 sample Substances 0.000 description 28
- 238000005070 sampling Methods 0.000 description 20
- 238000004458 analytical method Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
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- 230000008901 benefit Effects 0.000 description 2
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- 238000007906 compression Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003442 weekly effect Effects 0.000 description 2
- 206010000234 Abortion spontaneous Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 230000001965 increasing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 208000015994 miscarriage Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 208000000995 spontaneous abortion Diseases 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model discloses a kind of coal bed drilling gas measurement system, including：Hole sealing device, detection device and measurement apparatus；The hole sealing device includes hole sealing tube, pouch hole sealing device, and the hole sealing tube inserts the drilling in the coal seam, and sealing of hole filler is filled between the hole sealing tube and the coal seam, and the sealing of hole pipe end sets the pouch hole sealing device；The detection device includes at least one detection beam tube, and the detection beam tube front end is inserted in the hole sealing tube, and the detection beam tube end passes the hole sealing tube and is connected with least one measurement apparatus.The utility model carries out sealing of hole by pouch hole sealing device, so as to ensure the authenticity of gas sample and accuracy, while is connected by detecting beam tube with measurement apparatus, realizes monitoring in real time.
Description
Technical field
Colliery correlative technology field is the utility model is related to, particularly a kind of coal bed drilling gas measurement system.
Background technology
At present underground survey goaf gas closes logical by one during wall construction all using wall buried-pipe system is closed in goaf
The 2 small weapon pipes toward goaf are led to outside wall, separately add triplate line, one end connecting valve and peephole, beat valve in sampling
Open, true gas sample can be got the short time using negative pressure sampler, accurate judgement goaf whether there is spontaneous combustion hidden danger.Extract
Gas load air bag, be transported to ground carry out from ground carry out extraction analytical test.
Wherein, most of goaf gas sample use prevent fires it is closed on press the Φ 25mm set sighting tube, during sampling
Valve is opened, sample time is 3-5 minutes, and ground is fed gas into using air bag, with mine gas multiple spot parameter chromatogram certainly
Dynamic analyzer is analyzed, and measures gas concentration.
However, existing coal seam gas measuring method, has the disadvantage that：
(1) mine is in recovery process, and all goafs adopted are connected, although by adjusting ventilating system
Equal pressure condition is in after making the crossheading closing of goaf two, but is influenceed by approaches the working surface back production, in most cases enclosing wall
Air-suction state is in, because observation tube is long on enclosing wall, residual gas in pipe, when fire check work samples at the scene,
Actual gas within the walls can not be got using inflator.
(2) goaf gas sample depends on the closed upper sighting tube for pressing the Φ 25mm set of preventing fires, but close when preventing fires
When closing circumferential crack and leaking out, goaf produces cell breath, prevent fires it is closed in have accumulated the gas that leaks out, can not be true by sighting tube
Just getting the actual gas in goaf, it is impossible to accurately reflect the true component of gas in goaf, face from analysis result without
Method judges that goaf whether there is spontaneous fire hidden danger.
(3) probe tube material is metal, conductive hidden danger be present, and miscarriage easily causes electrostatic and enters goaf, causes gas
The generation of accident.
(4) existing mode.Because place is more, scope it is wide, it is necessary to human and material resources it is very big, be unfavorable for mine and drop this increasing
Effect, to the burden in shaft production increase cost.
(5) each place is required for manual measurement, and manual measurement has unstability, inaccuracy, subjectivity be present
Error in judgement, cause goaf gas sample misalignment.
(6) sampling is uncertain, if goaf sampling line is negative pressure state (goaf air inlet), cannot manually take
Sample.Personnel cost is caused to waste.
(7) in actual mechanical process, gas analysis results change is bigger, usually above goaf internal gas, causes
Goaf gas distortion, while had nearly 10 days because goaf air pressure change can not be sampled normally in the presence of one month, it is impossible to it is accurate
Judge that goaf whether there is spontaneous combustion hidden danger.
Utility model content
Based on this, it is necessary to need manual measurement, and the easy distortion of goaf gas for existing coal seam sample mode
Technical problem, there is provided a kind of coal bed drilling gas measurement system.
A kind of coal bed drilling gas measurement system, including：Hole sealing device, detection device and measurement apparatus；
The hole sealing device includes hole sealing tube, pouch hole sealing device, and the hole sealing tube inserts the drilling in the coal seam, and institute
Filling sealing of hole filler between hole sealing tube and the coal seam is stated, the sealing of hole pipe end sets the pouch hole sealing device；
The detection device includes at least one detection beam tube, and the detection beam tube front end is inserted in the hole sealing tube, described
Detection beam tube end passes the hole sealing tube and is connected with least one measurement apparatus.
Further, the pouch hole sealing device is the pouch of pressurization gas injection.
Further, in addition to it is arranged between the hole sealing tube and the coal seam and around the hole sealing glue of the hole sealing tube
Capsule.
Further, in addition to tracheae is returned in slip casting, and the slip casting returns tracheae front end and inserts the sealing of hole filler, the slip casting
Returning tracheae end sets slip casting to return tracheae gate valve.
Further, the measurement apparatus includes being respectively communicated with the detection beam tube end U-shaped differential manometer, vacuum are born
Press table, gas drainage under suction multi-parameter sensor, mine explosion-suppression and intrinsic safety type fire bound polyamine device.
Further, in addition to multi-path pipe, the detection beam tube end and a pipeline of the multi-path pipe connect
Logical, the other pipelines of the multi-path pipe are corresponded with multiple measurement apparatus and connected.
Further, the multi-path pipe set on each pipeline connected with the measurement apparatus measurement mouth,
And control measurement mouth and the measurement gate valve of pipeline break-make.
Further, the multi-path pipe is connected by flexible pipe with the measurement apparatus.
The utility model carries out sealing of hole by pouch hole sealing device, so as to ensure the authenticity of gas sample and accuracy,
Connected simultaneously by detecting beam tube with measurement apparatus, realize monitoring in real time.
Brief description of the drawings
Fig. 1 is a kind of system schematic of coal bed drilling gas measurement system of the utility model；
Fig. 2 is the operation schematic diagram of the best embodiment of the utility model.
Embodiment
The utility model is described in more detail with specific embodiment below in conjunction with the accompanying drawings.
It is as shown in Figure 1 a kind of system schematic of coal bed drilling gas measurement system of the utility model, including：Sealing of hole fills
Put, detection device and measurement apparatus；
The hole sealing device includes hole sealing tube 1, pouch hole sealing device 2, and the hole sealing tube 1 inserts the drilling in the coal seam 3,
And sealing of hole filler 4 is filled between the hole sealing tube 1 and the coal seam 3, the end of hole sealing tube 1 sets the pouch hole sealing device
2；
The detection device includes at least one detection beam tube 5, and detection beam tube 5 front end is inserted in the hole sealing tube 1, institute
Detection beam tube 5 end is stated to pass the hole sealing tube 1 and be connected with least one measurement apparatus.
Specifically, using the principle of closed air chamber, hole sealing tube 1, capsule are installed additional inside the extraction borehole in connection goaf 6
Bag hole sealing device 2, meanwhile, beam tube circuit, beam tube sampling probe built in detection beam tube 5, install sieve aperture additional outside drilling, will detect
Beam tube 5 is connected with measurement apparatus.
The utility model can run continuous samples.Traditional sampling mode, nearly 10-15 days thief holes in goaf one month
For air inlet, it is impossible to be sampled, therefore gas station in goaf can not be grasped, natural coal seam fire line can not be slapped in real time
Hold, potential safety hazard be present.And the utility model can completely abolish hidden danger.
The utility model carries out sealing of hole by pouch hole sealing device, so as to ensure the authenticity of gas sample and accuracy,
Connected simultaneously by detecting beam tube with measurement apparatus, realize monitoring in real time.
In one of the embodiments, the pouch hole sealing device 2 is the pouch of pressurization gas injection.
The present embodiment utilizes the pliability of pouch, and compression strength is larger so that in drilling space can intact sealing, form one
The air chamber of individual permanent closure, as the main gas tank of sampling, to ensure the authenticity of gas sample and accuracy.
In one of the embodiments, in addition to it is arranged between the hole sealing tube 1 and the coal seam 3 and surround the envelope
The sealing of hole capsule 7 of hole pipe 1.
The present embodiment better ensures that air-tightness using sealing of hole capsule 7.
In one of the embodiments, in addition to tracheae 8 is returned in slip casting, and the slip casting returns the front end of tracheae 8 and inserts the sealing of hole
Filler 4, the slip casting return the end of tracheae 8 and set slip casting to return tracheae gate valve 81.
The present embodiment returns tracheae 7 to be monitored to sealing of hole filler 4 by slip casting.
In one of the embodiments, the measurement apparatus includes the U-shaped pressure being respectively communicated with detection beam tube 5 end
Difference meter 9, negative pressure of vacuum table 10, gas drainage under suction multi-parameter sensor 11, mine explosion-suppression and intrinsic safety type fire bound polyamine device 12.
In the present embodiment, U-shaped differential manometer 9, for measuring gas differential pressure inside and outside goaf, negative pressure of vacuum table 10, for surveying
Goaf negative pressure is measured, observation gas gushes out situation of change, and gas drainage under suction multi-parameter sensor 11 is dense for measuring goaf gas
Degree, oxygen concentration, carbonomonoxide concentration, temperature, mine explosion-suppression and intrinsic safety type fire bound polyamine device 12 include same communication
Ground surface end and downhole end, downhole end 121 connect that progress 24 hours is continual to analyze goaf gas with detection beam tube 5 end
Composition, and analysis result is uploaded to ground surface end 122.
In one of the embodiments, in addition to multi-path pipe 13, the detection end of beam tube 5 and the multi-channel pipe
One pipeline connection of part 13, the other pipelines of the multi-path pipe 13 are corresponded with multiple measurement apparatus and connected.
Preferably, using tee pipe fitting.
In one of the embodiments, the multi-path pipe is set on each pipeline connected with the measurement apparatus
Measure mouth and control measurement mouth and the measurement gate valve of pipeline break-make.
Wherein, it is preferably to survey mouth to measure mouth.The present embodiment is by installing measurement mouth and measurement gate valve so that fire check work
It when carrying out weekly fire check, also can manually sample, i.e., open the measurement gate valve on pipeline, after 3~5min is taken out,
Sampled in the mouth from surveying, it becomes possible to get real gas sample.After the completion of sampling, measurement gate valve is closed.Meanwhile also it can will measure mouth
It is connected with detection beam tube.
In one of the embodiments, the multi-path pipe is connected by flexible pipe with the measurement apparatus.
The present embodiment is connected using flexible pipe, so as to exclude conductive hidden danger.
As most preferred embodiment of the present utility model, a kind of coal bed drilling gas measurement system, sealed using extraction borehole
Property it is good, small by mining influence, the multinomial advantage such as can construct in advance, while be taken out using the beam tube drainage system of mine, gas
The convenience of place system, form the measurement of closing borehole gases and sampler and technique.
Hole sealing tube 1, pouch hole sealing device 2, the hole sealing tube 1 insert the drilling in the coal seam 3, and the hole sealing tube 1 with
Sealing of hole filler 4 is filled between the coal seam 3, the end of hole sealing tube 1 sets the pouch hole sealing device 2；
The detection device includes at least one detection beam tube 5, and detection beam tube 5 front end is inserted in the hole sealing tube 1, institute
Detection beam tube 5 end is stated to pass the hole sealing tube 1 and be connected with least one measurement apparatus.
As shown in Fig. 2 the drilling 14 for the two Φ 153mm that constructed in advance in connection lane, has installed Φ 108mm hole sealing tubes 1 and has gone forward side by side
Sealing of hole is gone, has been stayed in side 15 of rolling back and rationalizing and set ball valve, Φ 10mm have been laid in Φ 108mm hole sealing tubes 1 and have detected beam tube 5 to glue along side
16。
If Fig. 1 is in the end of hole sealing tube 1 installation pouch, filling sealing of hole filler 4 between hole sealing tube 1 and the coal seam 3, around envelope
Hole pipe 1 sets sealing of hole capsule 7.Detect and beam tube circuit, beam tube sampling probe are set in beam tube 5, while install additional and sieve in hole sealing tube 1
Hole, beam tube circuit are connected to U-shaped differential manometer 9, negative pressure of vacuum table 10, gas drainage under suction multi-parameter sensor 11, mine explosion-suppression and intrinsic safety
Type fire bound polyamine device 12.
Using the principle of closed air chamber, after the advance of the face, glue is got rid of into goaf 6 along drill end, is closed in goaf
Period, sealing of hole pouch 7 is pressurizeed more than 13Mpa using force (forcing) pump, centre forms independent air chamber, prevents extraneous gas enters from boring
Hole, while using the pliability of pouch, compression strength is larger, enables the intact sealing in space in drilling, and extraneous gas can enter, shape
Into the air chamber of a permanent closure, the main gas tank as sampling.
Detection beam tube 5 is 4 core beam tubes, is scheduled in back production front lay in goaf.Wherein, U-shaped differential manometer 9, adopted for measuring
Gas differential pressure inside and outside dead zone, negative pressure of vacuum table 10, for measuring goaf negative pressure, observation gas gushes out situation of change, and gas is taken out
Multi-parameter sensor 11 is put, for measuring goaf gas concentration, oxygen concentration, carbonomonoxide concentration, temperature, mine explosion-suppression is simultaneous
Intrinsic safety type fire bound polyamine device 12 includes the ground surface end and downhole end of same communication, and downhole end connects with detection beam tube 5 end
It is logical to carry out 24 hours continual analysis goaf gas componants, and analysis result is uploaded to ground surface end.
Above-mentioned connected mode is all connected using flexible pipe by various devices, and one is filled on the pipeline being connected in threeway with drainage tube
Gate valve corresponding to individual, while weld one small survey mouth.So, when fire check work carries out weekly fire check, also
It can manually sample, i.e., the gate valve in threeway be opened, wait to take out 3~5min, be sampled in the mouth from surveying, it becomes possible to get real gas
Sample.After the completion of sampling, gate valve is closed.Meanwhile the survey mouth in threeway can be connected with detection beam tube.
In implementation process, it is divided into system two kinds of sampling and artificial sample automatically.
(1) automatic sampling.The utility model coal bed drilling gas measurement system is loaded in drilling, will using sealing of hole capsule
Bore closed, drill interior " main gas tank " for forming a closing.Detection beam tube in air chamber is connected to underground by crossover sub
Data chemical examination is carried out in substation, result of laboratory test is directly transferred to ground by optical cable, forms form.
(2) drainage system is observed.Borehole gases measurement and sampler are closed after, detection beam tube is passed through soft
Pipe is connected to extraction pipeline, and pipeline sets threeway, install sensor in threeway, you can observe goaf gas station at any time.
(3) manual sampling, can pull out U-shaped differential manometer, and being connected to negative pressure sampler in thief hole is sampled.
Using coal bed drilling gas measurement system of the present utility model, have the advantages that：
(1) can continuity be sampled, due to traditional sampling mode, nearly 10-15 days thief holes in goaf one month
For air inlet, it is impossible to be sampled, and then gas station in goaf can not be grasped, natural coal seam fire line can not be slapped in real time
Hold, potential safety hazard be present, hidden danger can be completely abolished using the system.
(2) can automatic sampling and sampling switching mutually manually, pass through the transformation to pipeline threeway, fire check work is to live
, can be true to get goaf from survey mouth with gas cylinder after 1~2min as long as the gate valve opened when carrying out fire check
Gas sample scene is analyzed, and the timely and effective true gas sample composition for grasping goaf of energy, can find that existing safety is hidden in time
Suffer from, substantially increase safety coefficient.
(3) goaf gas sample is carried out by drilling, the gas sample of acquirement can more accurately reflect the true of gas in goaf
Real component, at the same sample the operating environment of personnel, operating efficiency is also greatly improved.
(4) the goaf gas data analysis contrast Jing Guo commerical test (four months), it can be seen that two drillings 14 obtain
Gas sample it is more more regular than the gas sample oxygen concentration that obtains in the connection closed peephole in lane, being leaked out by closed crack, it is smaller to influence.Take
The oxygen concentration of sample is below closing wall sampling concentration, and (drilling takes average oxygen concentration 4.6%, gas density 25%, closed observation
Pipe takes average oxygen concentration 6.8%, gas density 13.5%), more accurate and effective.
(5) existing wall probe tube is KJ25 steel pipes, conductive hidden danger be present, and uses the system sampling, analysis to exclude
Such hidden danger.
(6) personnel's operation in tunnel is sampled, highly shortened sample time, the operating efficiency for sampling personnel improves
30% or so, save artificial, vehicle cost.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to the utility model patent scope.It should be pointed out that for the common of this area
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (8)
- A kind of 1. coal bed drilling gas measurement system, it is characterised in that including：Hole sealing device, detection device and measurement dress Put；The hole sealing device includes hole sealing tube, pouch hole sealing device, and the hole sealing tube inserts the drilling in the coal seam, and the envelope Sealing of hole filler is filled between coal seam described in Kong Guanyu, the sealing of hole pipe end sets the pouch hole sealing device；The detection device includes at least one detection beam tube, and the detection beam tube front end is inserted in the hole sealing tube, the detection Beam tube end passes the hole sealing tube and is connected with least one measurement apparatus.
- 2. coal bed drilling gas measurement system according to claim 1, it is characterised in that the pouch hole sealing device is to add The pouch of pressure injection gas.
- 3. coal bed drilling gas measurement system according to claim 1, it is characterised in that also include being arranged on the sealing of hole Between pipe and the coal seam and around the sealing of hole capsule of the hole sealing tube.
- 4. coal bed drilling gas measurement system according to claim 1, it is characterised in that also return tracheae including slip casting, institute State slip casting and return the tracheae front end insertion sealing of hole filler, the slip casting returns tracheae end and sets slip casting to return tracheae gate valve.
- 5. coal bed drilling gas measurement system according to claim 1, it is characterised in that the measurement apparatus includes and institute It is simultaneous to state U-shaped differential manometer, negative pressure of vacuum table, gas drainage under suction multi-parameter sensor, mine explosion-suppression that detection beam tube end is respectively communicated with Intrinsic safety type fire bound polyamine device.
- 6. coal bed drilling gas measurement system according to claim 1, it is characterised in that also including multi-path pipe, institute State a pipeline connection of detection beam tube end and the multi-path pipe, the other pipelines of the multi-path pipe with it is multiple described Measurement apparatus corresponds connection.
- 7. coal bed drilling gas measurement system according to claim 6, it is characterised in that the multi-path pipe is each Measurement mouth and control measurement mouth and the measurement gate valve of pipeline break-make are set on the pipeline connected with the measurement apparatus.
- 8. coal bed drilling gas measurement system according to claim 6, it is characterised in that the multi-path pipe passes through soft Pipe connects with the measurement apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720810999.5U CN206888947U (en) | 2017-07-06 | 2017-07-06 | Coal bed drilling gas measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720810999.5U CN206888947U (en) | 2017-07-06 | 2017-07-06 | Coal bed drilling gas measurement system |
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| Publication Number | Publication Date |
|---|---|
| CN206888947U true CN206888947U (en) | 2018-01-16 |
Family
ID=61298933
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| CN201720810999.5U Active CN206888947U (en) | 2017-07-06 | 2017-07-06 | Coal bed drilling gas measurement system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042812A (en) * | 2020-01-13 | 2020-04-21 | 煤科集团沈阳研究院有限公司 | Underground fixed-point sampling device and method |
| CN111579282A (en) * | 2020-05-28 | 2020-08-25 | 安徽理工大学 | In-situ detection method for primary CO in coal bed |
| CN113279721A (en) * | 2021-07-16 | 2021-08-20 | 山东辛丁技术有限公司 | Good oil sampling packer of stability |
| CN114184235A (en) * | 2021-12-16 | 2022-03-15 | 内蒙古科技大学 | Gob-side entry retaining side goaf collecting device and method |
-
2017
- 2017-07-06 CN CN201720810999.5U patent/CN206888947U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042812A (en) * | 2020-01-13 | 2020-04-21 | 煤科集团沈阳研究院有限公司 | Underground fixed-point sampling device and method |
| CN111579282A (en) * | 2020-05-28 | 2020-08-25 | 安徽理工大学 | In-situ detection method for primary CO in coal bed |
| CN113279721A (en) * | 2021-07-16 | 2021-08-20 | 山东辛丁技术有限公司 | Good oil sampling packer of stability |
| CN113279721B (en) * | 2021-07-16 | 2021-09-28 | 山东辛丁技术有限公司 | Good oil sampling packer of stability |
| CN114184235A (en) * | 2021-12-16 | 2022-03-15 | 内蒙古科技大学 | Gob-side entry retaining side goaf collecting device and method |
| CN114184235B (en) * | 2021-12-16 | 2023-09-22 | 内蒙古科技大学 | Gob-side entry retaining side goaf collecting device and gob-side entry retaining side goaf collecting method |
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