CN110985108B - Air cannon for improving gas permeability of coal bed - Google Patents
Air cannon for improving gas permeability of coal bed Download PDFInfo
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- CN110985108B CN110985108B CN201911304501.8A CN201911304501A CN110985108B CN 110985108 B CN110985108 B CN 110985108B CN 201911304501 A CN201911304501 A CN 201911304501A CN 110985108 B CN110985108 B CN 110985108B
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- 239000003245 coal Substances 0.000 title claims abstract description 60
- 230000035699 permeability Effects 0.000 title claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 33
- 239000000725 suspension Substances 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims description 18
- 238000005553 drilling Methods 0.000 claims description 6
- 230000001737 promoting effect Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 73
- 238000005457 optimization Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 208000012661 Dyskinesia Diseases 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- 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)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses an air cannon for improving gas permeability of a coal seam, which comprises a gas cabin main body, a cannon barrel pipe structure, a cannon barrel pipe, a cannon mouth belt, a bearing sheet, a closed operation window, an air inlet, an air pipe, a heavy hammer structure, a metal plate, a heavy hammer suspension rope, a string rod, a heavy object block, a support plate, a string hole, a buffer washer and a bayonet. The invention has the beneficial effects that: through calculating required pressure in advance, for the heavy object piece of the corresponding quality of the inside weight structural configuration of gas storehouse, can carry out the bombardment to the coal seam, the during operation need not artificial operation, manpower resources have been saved, the multiunit device can carry out series connection work simultaneously, show and promote work efficiency, the metal block design is cambered surface structure, the effectual metal block sidespin that prevents, the material has been saved simultaneously, the weight that the lower part hung comprises the heavy object piece can realize the control to bombardment intensity, only need can realize the change of weight through changing the heavy object piece, and convenient use.
Description
Technical Field
The invention relates to an air cannon, in particular to an air cannon for improving the gas permeability of a coal seam, and belongs to the technical field of air cannons.
Background
The coal bed gas refers to hydrocarbon gas which is stored in a coal bed, takes methane as a main component, is adsorbed on the surface of coal matrix particles as a main component, is partially dissociated in coal pores or dissolved in coal bed water, is an associated mineral resource of coal, and belongs to unconventional natural gas, commonly called as gas. When the air concentration of the coal bed gas reaches 5% -16%, the coal bed gas can explode when exposed to fire, which is the root cause of coal mine gas explosion accidents. The coal bed gas is directly discharged into the atmosphere, the greenhouse effect of the coal bed gas is about 21 times of that of carbon dioxide, and the coal bed gas is extremely destructive to the ecological environment. If coal bed gas is mined before coal mining, the gas explosion rate of the coal mine is reduced by 70 to 85 percent.
When coal mining operation is carried out, coal seam gas can cause serious coal mine accidents, the coal seam is fractured by physical means, the gas permeability of the coal seam is increased, the gas adsorbed in the coal seam escapes, and the probability of gas accidents can be reduced.
Disclosure of Invention
The invention aims to solve the problems and provide an air cannon for improving the gas permeability of a coal seam, which has a simple working mode, can effectively release gas dissociating in the coal seam and reduce the probability of accidents.
The invention realizes the aim through the following technical scheme, and the air cannon for improving the gas permeability of the coal bed comprises a gas bin main body, wherein an air inlet is formed in one side surface of the gas bin main body, an air pipe is fixedly penetrated through the other opposite side surface of the gas bin main body, the air inlet is communicated with a coal bed air compressing pipe, the coal bed air compressing pipe provides a high-pressure air source for the gas bin main body, a closed operation window is arranged in the side surface of the gas bin main body, one end of the gas bin main body is connected with a cannon barrel pipe structure, the cannon barrel pipe structure comprises a cannon barrel pipe, a cannon mouth belt and a bearing sheet, the cannon barrel pipe is arranged at one end of the gas bin main body, one end of the cannon barrel pipe is provided with a circle of the cannon mouth belt, the bearing sheet is arranged on the inner side wall of the cannon barrel pipe and is arranged in, the heavy hammer structure comprises a metal plate, a heavy hammer suspension rope, string rods, a heavy object block, a support plate, string holes, a buffer washer and a bayonet, wherein one side edge of the metal plate is abutted against one side of the bearing sheet, one side of the metal plate is also connected with the heavy hammer suspension rope, the other end of the heavy hammer suspension rope is fixedly connected with one side of the support plate, two string rods are relatively and vertically fixed on one side of the support plate, a plurality of heavy object blocks are arranged, the middle part of each heavy object block is provided with two string holes, the string rods penetrate through the string holes, the middle part of each heavy object block is also provided with the bayonet, the heavy hammer suspension rope penetrates through the bayonet, one side of each heavy object block is also fixedly connected with a circle of the buffer washer, one side of the metal plate close to the muzzle belt is of an arc surface structure, and the thickness of the central part of the metal plate is smaller than that of the edge part, the blast hole area is communicated with an air duct, and the air duct is suitable for extending into a drilling hole of a coal bed.
Preferably, in order to further enhance the tightness of the gas cabin, reduce the occurrence of gas leakage, and ensure the working efficiency, the heavy hammer structure further comprises a sealing gasket, wherein the sealing gasket is fixed on one side of the metal plate, and the other side of the sealing gasket is abutted against one side of the bearing sheet.
Preferably, in order to prevent the weight from directly damaging the gas chamber when falling down accidentally and reduce the loss, a falling cushion pad is further arranged at one end of the inner part of the gas chamber main body and is arranged right below the supporting plate.
Preferably, in order to increase the structural stability of the gas cabin as a whole and enable the gas cabin to better bear high-pressure gas inside, the gas cabin body is spherical in overall structure, and the opposite end of the gas cabin body, which is provided with the cannon barrel pipe, is a plane structure.
Preferably, in order to ensure that the metal plate is stably lifted under the action of gas pressure and prevent abnormal movement caused by uneven stress from causing gas leakage in advance, one side of the metal plate close to the muzzle belt is of an arc surface structure, and the thickness of the central part of the metal plate is smaller than that of the edge part.
Preferably, in order that the air cannons can uniformly apply pressure to the coal seam when bombarding, the muzzle belt comprises a plurality of circular muzzles which are equidistantly distributed on the circumference of the cannon barrel.
Preferably, the gas bin, the gun muzzle belt and the air inlet pipe are integrally formed.
Preferably, the periphery wall of air duct is equipped with the sealing washer in the cover, the sealing washer is suitable for sealed the periphery wall of air duct with the clearance between the internal perisporium of drilling.
The invention has the beneficial effects that: the invention can bombard the coal bed by calculating the required pressure in advance and configuring weight blocks with corresponding mass for the weight structure in the gas bin, does not need manual operation during working, saves human resources, simultaneously can carry out series working by a plurality of groups of devices, obviously improves the working efficiency, the metal plate in the weight structure can be gradually lifted under the gas pressurization effect provided by the gas inlet, the weight suspended at the lower part and composed of the weight blocks can realize the control of the bombardment strength, the metal block is designed into a cambered surface structure, the metal block is effectively prevented from sidespin, simultaneously materials are saved, when the metal block is jacked to a muzzle area, air is instantaneously released by the muzzle around the gun barrel, the coal bed is locally fractured, the fracture extension in the coal bed is promoted, the gas absorbed on the coal bed is released, the gas extraction efficiency of the gas can be improved, and the weight for adjusting the bombardment strength is composed of a plurality of groups of weight blocks, the weight of the heavy hammer can be changed only by replacing the heavy object, and the use is convenient.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the connection between the barrel structure and the weight structure shown in FIG. 1;
FIG. 3 is a schematic diagram of the structure of the weight shown in FIG. 2.
In the figure: 1. the gas cabin comprises a gas cabin body, 2, a gun barrel pipe structure, 21, a gun barrel pipe, 22, a gun muzzle belt, 23, a bearing sheet, 3, a closed operation window, 4, a gas inlet, 5, a gas pipe, 6, a heavy hammer structure, 61, a metal plate, 62, a sealing gasket, 63, a heavy hammer suspension rope, 64, a string rod, 65, a heavy block, 66, a supporting plate, 67, a string hole, 68, a buffer gasket, 69, a bayonet, 7 and a falling buffer cushion.
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.
Referring to fig. 1-3, an air cannon for improving gas permeability of a coal seam comprises a gas bin main body 1, wherein a gas inlet 4 is formed in a side surface of the gas bin main body 1, a gas pipe 5 is further fixedly penetrated through the other opposite side surface of the gas bin main body 1, the gas inlet 4 is communicated with a coal seam compressed air pipe, the coal seam compressed air pipe provides a high-pressure gas source for the gas bin main body 1, a closed operation window 3 is formed in the side surface of the gas bin main body 1, one end of the gas bin main body 1 is connected with a cannon barrel pipe structure 2, the cannon barrel pipe structure 2 comprises a cannon barrel 21, a cannon mouth belt 22 and a bearing sheet 23, the cannon barrel 21 is formed in one end of the gas bin main body 1, one end of the cannon barrel 21 is provided with a circle of the cannon mouth belt 22, the bearing sheet 23 is arranged on an inner side wall of the cannon barrel 21, one end of the bearing sheet 23 is connected with a weight structure 6, the weight structure 6 comprises a metal plate 61, a weight suspension rope 63, a string rod 64, a weight block 65, a support plate 66, a string hole 67, a buffer washer 68 and a bayonet 69, one side edge of the metal plate 61 is abutted against one side of the bearing sheet 23, one side of the metal plate 61 is further connected with the weight suspension rope 63, the other end of the weight suspension rope 63 is fixedly connected with one side of the support plate 66, two string rods 64 are relatively and vertically fixed on one side of the support plate 66, a plurality of the weight blocks 65 are arranged, two serial holes 67 are arranged in the middle of the weight blocks 65, the string rod 64 penetrates through the string hole 67, the middle part of the heavy object block 65 is also provided with the bayonet 69, the weight suspension line 63 penetrates through the bayonet 69, and one side of the weight block 65 is also fixedly connected with a circle of the buffer washer 68.
As a technical optimization scheme of the present invention, the weight structure 6 further includes a sealing washer 62, the sealing washer 62 is fixed to one side of the metal plate 61, and the other side of the sealing washer 62 abuts against one side of the bearing sheet 23.
As a technical optimization scheme of the invention, a falling cushion pad 7 is further arranged at one end inside the gas cabin body 1, and the falling cushion pad 7 is arranged right below the supporting plate 66.
As a technical optimization scheme of the present invention, the overall structure of the gas cabin body 1 is spherical, and the opposite end of the gas cabin body 1, where the cannon barrel pipe 21 is provided, is a plane structure.
As a technical optimization scheme of the invention, one side of the metal plate 61, which is closer to the muzzle band 22, is of a cambered surface structure, and the thickness of the central part of the metal plate 61 is smaller than that of the edge part.
As a technical optimization scheme of the present invention, the muzzle band 22 includes a plurality of circular muzzles equidistantly distributed on the circumference of the barrel 21.
As a technical optimization scheme of the invention, the air bin 1, the muzzle belt 22 and the air inlet 4 are integrally formed, the integrally formed air bin 1, the muzzle belt 22 and the air inlet 4 have high structural strength and are not easy to damage, the airtightness among the air bin 1, the muzzle belt 22 and the air inlet 4 can be improved, the assembly process among the air bin 1, the muzzle belt 22 and the air inlet 4 is eliminated, and the assembly efficiency is improved.
As a technical optimization scheme of the invention, the muzzle belt 22 is communicated with an air duct, the air duct is suitable for extending into a drill hole of a coal seam, a sealing ring is sleeved on the outer peripheral wall of the air duct, and the sealing ring is suitable for sealing a gap between the outer peripheral wall of the air duct and the inner peripheral wall of the drill hole. Through setting up the air duct, can lead the impact air that the air cannon produced to the coal seam depths, and then can promote the impact effect of air to the coal seam fracture to further promote the air permeability in coal seam and the efficiency of adopting of gas. And through set up the sealing washer on the air duct, not only can prevent that the air shock wave that the air duct produced from revealing through drilling and influencing the impact effect, can promote the stability of air duct moreover, prevent that the air duct is not hard up in drilling.
When the coal mine air storage bin is used, firstly, a plurality of the devices are linearly arranged at a target place, an air inlet 4 between every two devices is connected with an air pipe 5, the air inlet 4 of the first device is connected with an air pump, the tail end of the last air pipe 5 is kept sealed, and the air inlet 4 of the first air bin main body 1 is communicated with an air compression pipe of a coal mine.
The required weight mass is calculated in advance according to the required bombardment intensity, when the weight mass needs to be changed, the operation of replacing the weight block 65 of the internal weight structure 6 can be directly carried out through the closed operation window 3 arranged on the air chamber main body 1, when the weight block 65 is replaced, a bayonet 69 and a string hole 64 are arranged on the weight block 65, the bayonet 69 and the string hole 64 are sequentially sleeved on the weight suspension rope 63 and the string rod 64 on the support plate 66, the weight block 65 is prevented from falling off from the support plate 66 when the air cannon works, on the other hand, one side of each weight block 65 close to the support plate 66 is provided with a circle of buffer gasket 68, the damage of the weight block during cannon opening is reduced, the noise is reduced, the weight structure 6 is suspended in the cannon barrel 21 through the weight suspension rope 63 and the metal plate 61 and is supported by the bearing sheet 23, after the weight is balanced, the closed operation window is sealed again, then, the air pump is opened, gas is injected into the gas bin, the gas is pumped gradually, the pressure in the gas bin gradually increases, finally, the metal plate 61 is enabled to start to lift along the inner wall of the gun barrel pipe 21 under the action of pressure, and finally, the metal plate is lifted to the gun muzzle belt 22, compressed gas is released to the coal bed arranged at the gun muzzle from the gun muzzle of the gun muzzle belt 22 to the periphery, so that the coal bed is broken at the bombarded position, the air permeability of the coal bed is increased, adsorbed gas in the coal bed escapes, the gas extraction efficiency of the gas can be improved, after the gun is started, the heavy hammer drives the metal plate 61 to fall back under the action of gravity, and then, next blasting can be.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides an air cannon for promoting coal seam gas permeability, includes gas storehouse main part (1), its characterized in that: the gas bin is characterized in that an air inlet (4) is formed in the side face of the gas bin main body (1), an air pipe (5) is fixedly penetrated through the other opposite side face of the gas bin main body (1), the air inlet (4) is communicated with a coal seam compressed air pipe, the coal seam compressed air pipe provides a high-pressure air source for the gas bin main body (1), a closed operation window (3) is formed in the side face of the gas bin main body (1), one end of the gas bin main body (1) is connected with a gun barrel pipe structure (2), the gun barrel pipe structure (2) comprises a gun barrel pipe (21), a gun muzzle belt (22) and bearing pieces (23), the gun barrel pipe (21) is arranged at one end of the gas bin main body (1), one end of the gun barrel pipe (21) is provided with a circle of the gun muzzle belt (22), the bearing pieces (23) are arranged on the inner side wall of the gun barrel pipe (21) and the gun muzzle, one end of the bearing sheet (23) is connected with a heavy hammer structure (6), the heavy hammer structure (6) comprises a metal plate (61), a heavy hammer suspension rope (63), string rods (64), a heavy object block (65), a supporting plate (66), string holes (67), a buffer washer (68) and a bayonet (69), one side edge of the metal plate (61) is abutted against one side of the bearing sheet (23), one side of the metal plate (61) is also connected with the heavy hammer suspension rope (63), the other end of the heavy hammer suspension rope (63) is fixedly connected with one side of the supporting plate (66), one side of the supporting plate (66) is also relatively and vertically fixed with two string rods (64), a plurality of heavy object blocks (65) are arranged, the middle part of each heavy object block (65) is provided with two string holes (67), the string rods (64) penetrate through the string holes (67), the middle part of each heavy object block (65) is also provided with the bayonet (69), the heavy hammer suspension rope (63) penetrates through the bayonet (69), one side of the heavy object block (65) is further fixedly connected with a circle of buffer washer (68), one side, close to the muzzle belt (22), of the metal plate (61) is of an arc surface structure, the thickness of the center of the metal plate (61) is smaller than that of the edge portion, the muzzle belt (22) is communicated with an air guide pipe, and the air guide pipe extends into a drilling hole of a coal seam.
2. The air cannon for improving gas permeability of a coal seam according to claim 1, wherein: the heavy hammer structure (6) further comprises a sealing washer (62), the sealing washer (62) is fixed to one side of the metal plate (61), and the other side of the sealing washer (62) is abutted to one side of the bearing sheet (23).
3. The air cannon for improving gas permeability of a coal seam according to claim 2, wherein: the gas cabin is characterized in that a falling cushion pad (7) is further arranged at one end of the interior of the gas cabin body (1), and the falling cushion pad (7) is arranged under the supporting plate (66).
4. The air cannon for improving gas permeability of a coal seam according to claim 3, wherein: the integral structure of the gas cabin body (1) is spherical, and the opposite end of the gas cabin body (1) provided with the cannon barrel pipe (21) is of a plane structure.
5. The air cannon for improving gas permeability of a coal seam according to claim 4, wherein: the muzzle band (22) comprises a plurality of circular muzzles which are equidistantly distributed on the circumference of the cannon barrel (21).
6. The air cannon for improving gas permeability of a coal seam according to claim 5, wherein: the gas cabin body (1), the muzzle belt (22) and the air inlet (4) are integrally formed.
7. The air cannon for improving gas permeability of a coal seam according to claim 1, wherein: the periphery wall of air duct is equipped with the sealing washer in the cover, the sealing washer is suitable for sealed the periphery wall of air duct with the clearance between the internal perisporium of drilling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911304501.8A CN110985108B (en) | 2019-12-17 | 2019-12-17 | Air cannon for improving gas permeability of coal bed |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911304501.8A CN110985108B (en) | 2019-12-17 | 2019-12-17 | Air cannon for improving gas permeability of coal bed |
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| CN110985108B true CN110985108B (en) | 2021-07-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114737939B (en) * | 2022-03-25 | 2023-10-10 | 华北科技学院(中国煤矿安全技术培训中心) | Solid-gas mixed air cannon suitable for coal seam permeability improvement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103274135A (en) * | 2013-06-24 | 2013-09-04 | 张井龙 | Bunker dredging machine |
| CN203685187U (en) * | 2013-10-17 | 2014-07-02 | 湖南汉寿中煤科技有限公司 | Oriented CO2 air cannon device |
| CN104500019B (en) * | 2014-11-18 | 2017-02-22 | 辽宁工程技术大学 | Reinforced anti-reflection method for promoting gas extraction |
| CN106761901B (en) * | 2016-12-02 | 2020-04-03 | 中国矿业大学(北京) | Technique and equipment for preventing coal rock dynamic disaster by coal rock mass impact for mine |
| CN107701163B (en) * | 2017-10-11 | 2019-05-07 | 山东科技大学 | A kind of thermal agitation cooperates the secondary permeability improvement device in coal seam and method with drilling gas explosion |
| CN107956505A (en) * | 2017-10-18 | 2018-04-24 | 西安交通大学 | Coal mine down-hole drilling anti-reflection method based on controllable shock wave technology |
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