CN105507812B - Waterpower hole-punching method is vaporized in a kind of microwave radiation hole - Google Patents
Waterpower hole-punching method is vaporized in a kind of microwave radiation hole Download PDFInfo
- Publication number
- CN105507812B CN105507812B CN201511019352.2A CN201511019352A CN105507812B CN 105507812 B CN105507812 B CN 105507812B CN 201511019352 A CN201511019352 A CN 201511019352A CN 105507812 B CN105507812 B CN 105507812B
- Authority
- CN
- China
- Prior art keywords
- hole
- microwave
- hydraulic flushing
- waveguide
- drilling
- 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.)
- Active
Links
- 238000004080 punching Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005855 radiation Effects 0.000 title claims abstract description 13
- 238000011010 flushing procedure Methods 0.000 claims abstract description 48
- 238000005553 drilling Methods 0.000 claims abstract description 47
- 239000003245 coal Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000008016 vaporization Effects 0.000 claims abstract description 8
- 238000009834 vaporization Methods 0.000 claims abstract description 6
- 238000000605 extraction Methods 0.000 claims abstract description 5
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 abstract description 7
- 238000003795 desorption Methods 0.000 abstract description 2
- 230000010349 pulsation Effects 0.000 abstract description 2
- 230000008646 thermal stress Effects 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 208000001613 Gambling Diseases 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Earth Drilling (AREA)
Abstract
Waterpower hole-punching method is vaporized in a kind of microwave radiation hole, microwave antenna is connected to the inner terminal of coaxial waveguide and drilling is sent into, waveguide switch is connected in the outermost end of coaxial waveguide, waveguide switch is connected with rectangular waveguide, and rectangular waveguide is connected with microwave generator.Microwave generator is opened, meanwhile, open hydraulic flushing in hole equipment, water under high pressure partial vaporization in the presence of microwave, impact coal-mass.After the completion of hydraulic flushing in hole, hydraulic flushing in hole drill bit and drilling rod, microwave antenna and coaxial waveguide are withdrawn from, drilling progress is sealed and mash gas extraction.The present invention causes hydrone to heat up and vaporize by microwave irradiation, forms the bubble-liquid two-phase jet uniformly blended, bubble-liquid two-phase jet severe impact coal body due to strong pulsation effect；Meanwhile, high-temperature high-pressure steam promotes desorption of mash gas, and thermal stress dredging coal body hole, the crack of generation form fracture network in coal body, the effect of hydraulic flushing in hole enhanced significantly.
Description
Technical field
The present invention relates to waterpower hole-punching method is vaporized in a kind of microwave radiation hole, belong to the related skill of underground coal mine waterpower punching
Art field, be particularly suitable for use in high gas layer.
Background technology
China's coal-bed gas preservation has micropore, hyposmosis, the feature of high absorption, and gas permeability of coal seam is poor, causes big portion
Divide drainage from coal seam difficult, have a strong impact on the methane drainage and utilization project rate of gas.With coal-bed gas Controlling research work carry out in a deep going way, very
Many scholars have reached certain common recognition, i.e., the release for carrying out coal seam by irrigation measure is anti-reflection, improves coal seam permeability, reinforcing
Take out coal-bed gas in advance.Hydraulic flushing in hole is using rock pillar or coal column as safety curtain, using high-pressure water jet to the coal body around drilling
Impacted, go out substantial amounts of coal body, so as to form hole.Due to the effect of crustal stress, the coal body around hole occurs significantly
The displacement of degree, causes the gas in the abundant release of hole surrounding medium, permeability coefficient increase, coal body significantly to be released
Put.However, pure water jets hydraulic pressure is higher, impact effect is poor；Although abradant jet can significantly improve impact effect, also can
A series of problems, such as triggering nozzle damage, gambling hole；Bubble-liquid two-phase jet can significantly improve these problems, however, gas-liquid is uniformly mixed
Mixed is a new problem.Therefore, a kind of new gas-liquid two-phase hydraulic flushing in hole method of research and development is needed badly, to solve answering for this technology
Use bottleneck.
The content of the invention
Technical problem：The purpose of the present invention be overcome weak point present in prior art there is provided a kind of method it is simple,
Vaporization waterpower hole-punching method in the microwave radiation hole of hydraulic flushing in hole efficiency can be greatly improved.
Technical scheme：Waterpower hole-punching method is vaporized in the microwave radiation hole of the present invention, is included in coal seam a brill of constructing
Hole, comprises the following steps：
A, hydraulic flushing in hole drill bit is connected to hydraulic flushing in hole drilling rod front end and sent into drilling, until hydraulic flushing in hole drill bit is arrived
Up to roof；
Drilling is simultaneously sent into b, the front end that microwave antenna is connected to coaxial waveguide, until microwave antenna is reached in coal seam
Between position, connect waveguide switch in the exposed junction of coaxial waveguide, waveguide switch is connected with rectangular waveguide, rectangular waveguide
Pipe is connected with microwave generator；
C, opening microwave generator, the microwave of generation pass sequentially through rectangular waveguide, waveguide switch and coaxial waveguide,
Finally reach microwave antenna and the coal seam transmitting from microwave antenna into drilling；
D, the exposed junction connection hydraulic flushing in hole equipment by hydraulic flushing in hole drilling rod, conventional hydraulic punching operation is implemented to coal seam,
Water under high pressure partial vaporization in the presence of microwave, impact coal-mass；
E, when punching coal output reaches 2 ton hours, withdraw from hydraulic flushing in hole drill bit, hydraulic flushing in hole drilling rod, microwave antenna and coaxial
Waveguide, is sealed and mash gas extraction to drilling progress.
Described boring aperture is 113mm, and the diameter of hydraulic flushing in hole drill bit and hydraulic flushing in hole drilling rod is 75mm.
The working frequency of described microwave generator is 2.45GHz, and power is 2kW.
Beneficial effect：By adopting the above-described technical solution, the present invention in microwave radiation hole by vaporizing hydraulic flushing in hole, energy
Enough greatly improve hydraulic flushing in hole efficiency.Because the dielectric constant of water is larger, pass through microwave irradiation water jet so that hydrone is violent
Collide, heat up and vaporize, form the bubble-liquid two-phase jet uniformly blended, bubble-liquid two-phase jet is acute due to strong pulsation effect
Strong impact coal-mass；Meanwhile, high-temperature high-pressure steam promotes desorption of mash gas, thermal stress dredging coal body hole, the crack of generation, in coal body
Interior formation fracture network；Compared to pure water jets, the present invention realizes the lifting of target efficiency under relatively low hydraulic pressure；Relative to mill
Expect jet, the present invention solves abrasive material damage nozzle, and the problem of blocking drilling enhances the effect of hydraulic flushing in hole significantly.Its side
Method is simple, and easy to operate, crack effect is good, in the art with wide applicability.
Brief description of the drawings
Fig. 1 is that waterpower hole-punching method schematic diagram is vaporized in the microwave radiation hole of the present invention.
In figure：1- coal seams, 2- drillings, 3- hydraulic flushing in hole drill bits, 4- hydraulic flushing in hole drilling rods, 5- microwave antennas, 6- on-axis waves
Conduit, 7- waveguide switch, 8- rectangular waveguides, 9- microwave generators.
Embodiment
One embodiment of the present of invention is further described below in conjunction with the accompanying drawings：
Waterpower hole-punching method is vaporized in the microwave radiation hole of the present invention, is comprised the following steps that：
A, a drilling 2 of being constructed in coal seam 1, are connected to the front end of hydraulic flushing in hole drilling rod 4 by hydraulic flushing in hole drill bit 3 and send into
In drilling 2, until hydraulic flushing in hole drill bit 3 reaches roof；The described aperture of drilling 2 is 113mm, the He of hydraulic flushing in hole drill bit 3
The diameter of hydraulic flushing in hole drilling rod 4 is 75mm.
B, microwave antenna 5 is connected to the front end of coaxial waveguide 6 and drilling 2 is sent into, until microwave antenna 5 reaches coal seam
(1) centre position, connects waveguide switch 7, waveguide switch 7 connects with rectangular waveguide 8 in the exposed junction of coaxial waveguide 6
Connect, rectangular waveguide 8 is connected with microwave generator 9；
C, opening microwave generator 9, the microwave of generation pass sequentially through rectangular waveguide 8, waveguide switch 7 and coaxial waveguide
Pipe 6, finally reaches microwave antenna 5 and is launched from coal seam of the microwave antenna 5 into drilling 2；The work of described microwave generator 9
Frequency is 2.45GHz, and power is 2kW.
D, the exposed junction connection hydraulic flushing in hole equipment by hydraulic flushing in hole drilling rod 4, implement conventional hydraulic punching to coal seam 1 and make
Industry, water under high pressure partial vaporization in the presence of microwave, impact coal-mass；
E, when punching coal output reaches 2 ton hours, withdraw from hydraulic flushing in hole drill bit 3, hydraulic flushing in hole drilling rod 4, microwave antenna 5 and same
Axle waveguide 6, carries out sealing and mash gas extraction to drilling 2.
Embodiment 1, as shown in figure 1, in microwave radiation hole vaporize waterpower hole-punching method：First, in Di Chou lanes routinely
Method constructed in coal seam 1 aperture be 113mm layer-through drilling 2.After the completion of the construction of drilling 2, common drilling rod and brill are exited
Head, is connected to the inner terminal of hydraulic flushing in hole drilling rod 4 by hydraulic flushing in hole drill bit 3 and sends into drilling 2, until hydraulic flushing in hole drill bit 3 is arrived
Up to roof, the diameter of hydraulic flushing in hole drill bit 3 and hydraulic flushing in hole drilling rod 4 is 75mm.Microwave antenna 5 is connected to on-axis wave
The inner terminal of conduit 6 simultaneously sends into drilling 2, until microwave antenna 5 reaches the centre position in coal seam 1, in the outermost of coaxial waveguide 6
End connection waveguide switch 7, waveguide switch 7 is connected with rectangular waveguide 8, and rectangular waveguide 8 is connected with microwave generator 9,
The working frequency of microwave generator 9 is 2.45GHz, and power is 2kW.Microwave generator 9 is opened, the microwave of generation passes sequentially through square
Corrugated waveguide 8, waveguide switch 7 and coaxial waveguide 6, finally reach microwave antenna 5 and are launched from microwave antenna 5 to drilling 2.
Then, the outermost end of hydraulic flushing in hole drilling rod 4 is connected into hydraulic flushing in hole equipment, conventional hydraulic punching operation, high pressure is implemented to coal seam 1
Water partial vaporization in the presence of microwave, impact coal-mass.When punching coal output reaches 2 ton hours, hydraulic flushing in hole drill bit 3, water are withdrawn from
Power punching drilling rod 4, microwave antenna 5 and coaxial waveguide 6, carry out sealing and mash gas extraction to drilling 2.
Claims (3)
1. vaporizing waterpower hole-punching method in a kind of microwave radiation hole, it is included in coal seam（1）Middle one drilling of construction（2）, its feature
It is, it is further comprising the steps of：
A, by hydraulic flushing in hole drill bit（3）It is connected to hydraulic flushing in hole drilling rod（4）Front end, pass through hydraulic flushing in hole drilling rod（4）By waterpower
Punching drill bit（3）Feeding drilling（2）It is interior, until hydraulic flushing in hole drill bit（3）Reach roof；
B, by microwave antenna（5）It is connected to coaxial waveguide（6）Front end and send into drilling（2）, until microwave antenna（5）Reach
Coal seam（1）Centre position, in coaxial waveguide（6）Exposed junction connection waveguide switch（7）, waveguide switch（7）With square
Corrugated waveguide（8）Connection, rectangular waveguide（8）With microwave generator（9）Connection；
C, opening microwave generator（9）, the microwave of generation passes sequentially through rectangular waveguide（8）, waveguide switch（7）And on-axis wave
Conduit（6）, finally reach microwave antenna（5）And by microwave antenna（5）To drilling（2）Interior coal seam transmitting；
D, in hydraulic flushing in hole drilling rod（4）Expose one end connection hydraulic flushing in hole equipment of drilling, to coal seam（1）Implement conventional hydraulic punching
Hole operation, water under high pressure partial vaporization in the presence of microwave, impact coal-mass；
E, when punching coal output reaches 2 ton hours, withdraw from hydraulic flushing in hole drill bit（3）, hydraulic flushing in hole drilling rod（4）, microwave antenna（5）With
Coaxial waveguide（6）, to drilling（2）Progress is sealed and mash gas extraction.
2. waterpower hole-punching method is vaporized in a kind of microwave radiation hole according to claim 1, it is characterised in that：Described brill
Hole（2）Aperture is 113 mm, hydraulic flushing in hole drill bit（3）With hydraulic flushing in hole drilling rod（4）Diameter be 75 mm.
3. waterpower hole-punching method is vaporized in a kind of microwave radiation hole according to claim 1, it is characterised in that：Described is micro-
Wave producer（9）Working frequency be 2.45 GHz, power be 2 kW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511019352.2A CN105507812B (en) | 2015-12-29 | 2015-12-29 | Waterpower hole-punching method is vaporized in a kind of microwave radiation hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511019352.2A CN105507812B (en) | 2015-12-29 | 2015-12-29 | Waterpower hole-punching method is vaporized in a kind of microwave radiation hole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105507812A CN105507812A (en) | 2016-04-20 |
| CN105507812B true CN105507812B (en) | 2017-08-11 |
Family
ID=55716078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511019352.2A Active CN105507812B (en) | 2015-12-29 | 2015-12-29 | Waterpower hole-punching method is vaporized in a kind of microwave radiation hole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105507812B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106499366B (en) * | 2016-11-01 | 2019-04-26 | 中国矿业大学 | A kind of coal bed gas enhanced recovery method that microwave is mutually cooperateed with ultrasonic wave |
| CN106285605B (en) * | 2016-11-01 | 2019-06-04 | 中国矿业大学 | A kind of microwave liquid nitrogen collaboration freeze thawing coal seam anti-reflection method |
| CN106321142A (en) * | 2016-11-01 | 2017-01-11 | 中国矿业大学 | Rock cross-cut coal uncovering method combining microwave-assisted extraction with grouting reinforcement |
| CN106761796B (en) * | 2016-11-22 | 2018-08-28 | 东北大学 | Microwave stress release device and application on a kind of TBM for rock-burst prevention |
| CN106769498A (en) * | 2016-11-22 | 2017-05-31 | 东北大学 | The power thermal coupling loading device and test method of rock sample under microwave |
| CN106812512A (en) * | 2017-03-02 | 2017-06-09 | 新疆大学 | Low-permeability water-bearing coal seam reservoirs microwave steam explosion is anti-reflection drop absorbing method |
| CN106869991B (en) * | 2017-03-06 | 2019-02-19 | 中国矿业大学 | A kind of coal body anti-reflection method of microwave hot air coupling heat injection |
| CN111305755B (en) * | 2018-12-12 | 2022-03-08 | 中国石油化工股份有限公司 | High-temperature abrasive jet drilling system and drilling method |
| CN110029997A (en) * | 2019-04-28 | 2019-07-19 | 湖南科技大学 | A kind of presplitting Sub-Level Caving method based on microwave hydrothermal effect |
| CN110374594B (en) * | 2019-06-13 | 2020-11-03 | 太原理工大学 | Method and device for weakening strong mine pressure of thick hard roof during mining of underlying coal seam through microwave heating |
| CN110374595B (en) * | 2019-06-13 | 2020-12-15 | 太原理工大学 | Microwave heating U-type method for reducing composite strong mine pressure of thick hard top plate and left coal pillar |
| CN111287702A (en) * | 2020-02-20 | 2020-06-16 | 中国矿业大学 | Coal bed permeability increasing method with ice particle abrasive jet flow slotting and microwave heat injection in cooperation |
| CN112212748B (en) * | 2020-10-21 | 2023-11-24 | 中冶北方（大连）工程技术有限公司 | Well and tunnel construction method and device based on microwave fracturing rock |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB382792A (en) * | 1931-02-02 | 1932-11-03 | Johannes Anthonius Alphonsus M | Method of and means for making bore holes |
| GB2042399B (en) * | 1979-01-15 | 1982-09-22 | Boc Ltd | Method and apparatus for penetrating a body of material or treating a surface |
| CN103790516A (en) * | 2014-03-04 | 2014-05-14 | 中国石油大学(北京) | New well drilling method for efficient rock breaking by means of heating power jet flow |
| CN204402376U (en) * | 2014-12-22 | 2015-06-17 | 中石化胜利石油工程有限公司钻井工艺研究院 | A kind of double-wall drill pipe well system |
-
2015
- 2015-12-29 CN CN201511019352.2A patent/CN105507812B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB382792A (en) * | 1931-02-02 | 1932-11-03 | Johannes Anthonius Alphonsus M | Method of and means for making bore holes |
| GB2042399B (en) * | 1979-01-15 | 1982-09-22 | Boc Ltd | Method and apparatus for penetrating a body of material or treating a surface |
| CN103790516A (en) * | 2014-03-04 | 2014-05-14 | 中国石油大学(北京) | New well drilling method for efficient rock breaking by means of heating power jet flow |
| CN204402376U (en) * | 2014-12-22 | 2015-06-17 | 中石化胜利石油工程有限公司钻井工艺研究院 | A kind of double-wall drill pipe well system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105507812A (en) | 2016-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105507812B (en) | Waterpower hole-punching method is vaporized in a kind of microwave radiation hole | |
| CN106285605A (en) | A kind of microwave liquid nitrogen works in coordination with freeze thawing coal seam anti-reflection method | |
| CN105484720B (en) | The coal seam anti-reflection method that a kind of On Microwave-assisted Extraction is mutually cooperateed with hydraulic fracturing | |
| CN102852506B (en) | High-pressure pneumatic blasting pressure relieving and transmission increasing method | |
| CN108361061B (en) | Low permeability coal seam electric detonation and microwave-assisted liquid nitrogen freeze thawing anti-reflection device and method | |
| CN106761796B (en) | Microwave stress release device and application on a kind of TBM for rock-burst prevention | |
| CN105525901B (en) | A kind of coal seam hydraulic fracture reinforcing anti-reflection method based on microwave irradiation | |
| CN106285604A (en) | A kind of microwave-assisted supercritical carbon dioxide circulation frac system and method | |
| CN110359913B (en) | Safe and efficient mining method for improving permeability of low-permeability sandstone type uranium deposit | |
| CN105971660A (en) | Ultrasonic cavitation and hydrofracture combined stimulation coalbed methane extraction method | |
| CN104213921B (en) | Based on the freezing type coal uncovering method of hydraulic slotted liner technique | |
| CN104632270A (en) | Oscillating impulse type high-energy gas fracturing and heat injection alternating gas-extracting method | |
| CN106499366A (en) | A kind of coal bed gas enhanced recovery method that microwave is mutually cooperateed with ultrasound wave | |
| CN106869991B (en) | A kind of coal body anti-reflection method of microwave hot air coupling heat injection | |
| CN104696003A (en) | Coal seam gas extraction method capable of realizing drilling and cutting integration and oscillation and heat injection cooperative reinforcement | |
| CN204804691U (en) | Drilling rig is assisted to millimeter wave | |
| CN107816340B (en) | Process method for thermally extracting shale gas by combining high-power ultrasonic waves with branch horizontal well | |
| CN108194070A (en) | A kind of ultrasonic action and hydraulic slotted liner technique integrated apparatus, complex intensifying gas drainage system and method | |
| CN212003131U (en) | Enhanced gas extraction system applying hot steam and microwave radiation in cooperation with permeability-increasing coal seam | |
| CN104481574A (en) | Method for improving coal seam gas permeability through high energy acoustoelectric composite technology | |
| CN209855850U (en) | Enhanced gas extraction device for step-by-step permeability-increasing coal seam | |
| CN102080525A (en) | High-pressure gas injection hole-drilling pressure-releasing outburst prevention method | |
| CN110388206B (en) | Method and device for plasma uplink fracturing of residual coal pillar in residual mining area | |
| CN111520110B (en) | Supercritical CO of horizontal well2Method and system for developing enhanced geothermal energy by fracturing | |
| CN110029997A (en) | A kind of presplitting Sub-Level Caving method based on microwave hydrothermal effect |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171227 Address after: 221116 Research Institute, China University of Mining and Technology, Xuzhou University, Jiangsu, China, Co-patentee after: The large Mine Safety Technology of Xuzhou chats and equipment research and development centre Patentee after: China University of Mining & Technology Address before: 221116 Research Institute, China University of Mining and Technology, Xuzhou University, Jiangsu, China, Patentee before: China University of Mining & Technology |