CN103899350A - Fully mechanized caving face supporting top coal gas extraction system - Google Patents
Fully mechanized caving face supporting top coal gas extraction system Download PDFInfo
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Abstract
A fully mechanized caving face supporting top coal gas extraction system comprises hydraulic supports. A top beam is arranged on the tops of the hydraulic supports, a groove is formed in the middle of the top beam in the length direction, a supporting main pipe is arranged below the top beam, an extraction hole communicated with the groove is formed in the top beam and connected with the supporting main pipe through a supporting branch pipe, the top beam is provided with at least one partition board in the length direction of the bottom surface of the groove, the partition board separates the groove to form extraction grooves, and ventilation groove holes enabling all the extraction grooves to be communicated are formed in the two sides of an upper end of the extraction hole of the top beam. According to the system, the fully mechanized caving face gas concentration can be reduced, the transfinite gas condition is reduced, the extraction rate and the yield of a working face are improved, the system has promotional value in national coal mine, fully mechanized caving face safety conditions are improved, the yield of coal is increased, and economic and social benefits are remarkable.
Description
Technical field
The invention belongs to coal mine gas extraction technical field, relate in particular to a kind of fully mechanized coal face frame and carry top coal gas drainage system.
Background technology
Over nearly 30 years, the Coal Mining Equipment Complement technology of China is through introduction, popularization, perfect, the development that improves several stages, in succession overcome a difficult problem for the aspects such as basic theory, fully mechanized coal face ore deposit pressure presentation attributes, coal winning technology, the raising rate of extraction, caving roof coal hydraulic support and corollary equipment, high-yield and high-efficiency and automatic technology and equipment, gas control, because top coal caving has, shortening mines prepares the remarkable advantages such as duration, coal mining work efficiency is high, tunnelling rate is few, is widely applied in China.Particularly since 2000, Longwall top coal caving technology has replaced layering to combine adopting, become the main method of the state-owned coal mining high seam of China substantially.
Most high seams of China are Gas-bearing Coal Seams, wherein more than 50% belong to high gas layer.Due to top-coal caving face full-seam mining, output is large, the absolute outburst amount of gas increases, and causes at stope, coal discharge outlet and tailgate and has gas exceeding limit and potential Gas Disaster impact, the bottleneck that gas problem has become restriction Sub-Level Caving technology to apply in China.
At present, carry out two kinds of technical schemes below the general employing of gas control at high gas fully mechanized coal face:
The first, select rational tunnel to arrange and face-airing mode
Generally, work plane adopts one to enter the U-shaped draft type of a time, requires face gas outburst amount to be not more than 5.0m
3when/min.When gas emission is greater than 5.0m
3after/min, just should consider to adopt other draft type.Most typical be exactly along roof arrange one with tailgate in the special drawing-off gas lane (You Chenggaochou lane, bypass air return system) of wrong 10m ~ 20m, form E type tunnel layout and draft type that typical top coal caving one enters two times.
In addition, what the high gas comprehensive coal face of being everlasting used also has: U+L type ventilates, and, on the basis of U-shaped ventilation, arranges a special gas tail road in the coal column outside of tailentry along roof; H type ventilates, and in goaf, stope drift active workings is remained, and uses as a special drawing-off gas lane.
Facts have proved, in special firedamp drainage lane, gas density is large, emission effect is good, reduce to a great extent the gas density in work plane and return airway, especially fine to upper corner drawing-off gas effect, having controlled preferably upper corner gas density, is the measure that high gas fully mechanized coal face is the most often selected.
This gas control mode has following shortcoming:
1), increased tunnelling and maintenance engineering amount, especially drawing-off gas lane is arranged in roof, is subject to dynamic pressure to affect deflection larger;
2), gas is dense in drawing-off gas lane, often meets or exceeds explosion limit, can accomplish in lane without equipment, without personnel although strengthen management, if there is spontaneous fire danger in coal seam, the safety in production of mine can be had a strong impact on;
3), can not solve coal discharge outlet gas exceeding limit problem in comprehensive coal face completely, although the gas of considerable part has been shunted in drawing-off gas lane, work plane, upper corner and return airway gas density are reduced, but drawing-off gas lane is arranged in work plane top top board, coal discharge outlet gas impact on work plane inside is less, and coal discharge outlet gas exceeding limit problem still exists.
The second, gas drainage technique mainly contains several large classes such as this coal bed gas drainage, goaf gas drainage, the next layer gas extraction, each class has multiple arrangement according to concrete geological conditions again, form gas drainage under suction system of all kinds, played key effect for administering gas.
In recent years, the rules and regulations such as new edition " safety regulations in coal mine ", " control coal and Gas Outburst regulation " are carried out effective gas drainage under suction to high gas, projecting mine mandatory requirement.As a kind of measure of adopting front reduction coal-bed gas concentration, gas drainage under suction is the effective way that fundamentally reduces top coal caving gas emission, and the safety factor of work plane can greatly improve back production time, is the Firedamp precaution measures that comprehensive coal face is preferentially selected.
This gas control mode has following shortcoming:
1), mash gas pumping drilling construction engineering quantity is large, sometimes also needs the drill site chamber of simultaneously constructing, it is difficult while boring coal seam to meet, boring length is restricted; The gas pumping time is long, and normal and production and driving interact, and sometimes even affect getting working face progress and output;
2), in the poor coal seam of gas permeability, gas pumping effect does not often reach requirement, coal seam anti-reflection engineering if desired also needs to construct in advance.
Summary of the invention
The present invention is in order to solve weak point of the prior art, provides a kind of convenient operation, engineering quantity is little, gas pumping is thorough, fully mechanized coal face frame safe and reliable, that do not affect digging operation carries top coal gas drainage system.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: fully mechanized coal face frame carries top coal gas drainage system, comprise hydraulic support, hydraulic support top is provided with back timber, described back timber middle part is provided with groove along its length one, back timber below is provided with frame and carries supervisor, and back timber is provided with the drainage holes being communicated with groove, and drainage holes and frame carry and between supervisor, carry arm by frame and be connected.
Described back timber is provided with at least one dividing plate along groove floor length direction, and dividing plate separates groove to form extraction groove, and back timber is provided with a ventilative slotted eye that all extraction grooves are communicated with in both sides, drainage holes place suitable for reading.
Described hydraulic support is arranged side by side at least two, each hydraulic support includes base, on each base, be equipped with front hydraulic vertical prop and rear hydraulic vertical prop, described back timber is located on front hydraulic vertical prop and rear hydraulic vertical prop, frame carries supervisor between front hydraulic vertical prop and rear hydraulic vertical prop, and top beam rear end is hinged with caving shield, and caving shield bottom is provided with and is provided with connecting rod between base, back timber front end is hinged with flip beam, between back timber and flip beam bottom, is provided with overturning oil cylinder.
The width of described groove is 250-350mm, and the degree of depth is 25-35mm.
Adopt technique scheme, first, the definition of longwall top coal caving and fully mechanized coal face once need to be described.Longwall top coal caving: full name is Coal Mining Equipment Complement technology, in the time of 5～20 meters of thick high seams of exploitation, in underlying seam, arrange coal-face, the window of top coal from hydraulic support emitted, original high seam is needed to the disposable extraction of coal (abbreviation full-seam mining) that layering repeatedly could extraction, there are many remarkable advantages.Fully mechanized coal face: refer to the coal-face that uses the exploitation of Coal Mining Equipment Complement technique.
In the system of top coal caving hydraulic support and top board composition, hydraulic support is implemented to control to top board by top coal, simultaneously the pressure of top board is delivered on hydraulic support by top coal, and top coal will be moved, is out of shape in the process of the power of transmission, broken, inbreak and emitting.The crack of top coal starts from the bearing pressure peak region of rib front, and under Action of Fixed Abutment Pressure, top coal occurs to shear and tensile failure, occurs the preexisting crack in crack or expansion coal body.Along with the revolution of the advance of the face, top board is sunk, top cleat in coal further develops.After top coal enters into hydraulic support top, by inbreak gradually, and be deposited on support caving shield and form a prose style free from parallelism.Top coal is continuous, a progressive destructive process from starting movement, breaking to inbreak, and along with the advance of the face, this process is also dynamically passed forward naturally.Grow and destructiveness according to top cleat in coal, along advance of the face direction, generally can be divided into Si Ge district: reset condition district I, compressive strain district II, draw and break split plot III and ⅣSi Ge district of prose style free from parallelism Mao Fang district.
Top-coal caving face is positioned at the bottom in coal seam, and gas has exploitation coal body and two sources of coal body, support top.Because the density of gas is 55.4% of atmospheric density, floating effect is obvious, thereby on integrated caving hydraulic support, back timber and caving shield, in loose coal, gather a large amount of free gas, form so-called " gas storehouse ", cause the hydraulic support phenomenon that transfinites more, and the phenomenon that transfinites on hydraulic support is difficult to solve with method of ventilation, therefore cause a large amount of gas in the time putting coal to gush out from coal discharge outlet, directly threaten work plane safety in production.
Can be found out by above analysis, the coal body of hydraulic support top is positioned at rib line rear side, break split plot and prose style free from parallelism Mao Fang district in drawing, cranny development is abundant, coal body good permeability, simultaneously, due to the floating effect of gas, in loose coal crack, will gather a large amount of high concentration gas herein, especially at the work plane of high gas layer, will form top coal " gas storehouse ".Therefore, form negative pressure at hydraulic support top, will extraction arrive a large amount of high concentration gas, thereby improve gas storehouse absolute altitude, reduce gas storehouse and coal discharge outlet gas density.
The present invention proposes that fully mechanized coal face frame is carried to top coal gas drainage system and carries out research and development.Basic conception is: on the back timber of synthetical support, beat extraction hole, drainage device (comprising that frame carries supervisor and frame carries arm) is installed, utilize top-coal caving face cleat in coal to grow, the feature that gas permeability of coal seam is good, above hydraulic support, form negative pressuren zone, force top coal gas to be migrated to negative pressuren zone, realize the top coal gas on integrated caving hydraulic support top is carried out to extraction, drainage device on each hydraulic support is connected by flexible conduit and is communicated with the total drainage system of mine, forms top coal gas drainage system.The target that the present invention will realize is: utilize top coal gas drainage system to play to dam top coal gas, reduce its gushing out to coal-face; Meanwhile, the low level dead angle gas that goaf retains is also to the migration of negative pressure band, and negative pressure band is put raising the gas absolute altitude in coal goaf, can reduce like this gas density of coal discharge outlet.In addition, be arranged on hydraulic support because frame carries extraction pipeline, after installing, can use continuously, continue extraction during the whole advance of the face, saved the work such as drilling, sealing of hole continuous, management and using is very convenient.
At the leading abutment pressure of coal-face and hydraulic moving stand repeatedly under supporting role, top coal is cut by longitudinal crack, and these cracks have certain Communicating.In the situation that roof seals, the gas that top coal is gushed out will spread to both direction, spread to goaf and spread to work plane by gap between frame.The through back timber in longitudinal crack of top coal, because goaf is the scope of freedom, longitudinally cranny development, and there is the property of opening, and therefore more to the gas of goaf diffusion, thus coal discharge outlet gas exceeding limit caused.In the middle of comprehensive coal face back timber, have a depressed area, make to have a loose ventilating area on back timber, longitudinal crack of loose ventilating area and top coal is linked up, and this has created favourable objective condition for back timber perforate extraction top coal gas.If form a negative pressuren zone on Sub-Level Caving back timber, by the Gas-Flow that changes top coal and treat Sub-Level Caving to.
Therefore, back timber arranges reinforcement flange in the left and right sides, form the groove of wide about 300mm, dark about 30mm between back timber upper surface and two reinforcement flanges, has played the effect of less extraction gas leakage, depressed area is loose ventilating area, and drainage holes is arranged on a certain position of depressed area.
The connection that frame carries extraction pipeline is also one of key technology of the application.First will ensure that extraction pipeline and extraction hole, frame top are easy to connect, reliable, also will make extraction pipeline between frame be connected firmly, while preventing from moving frame, pipeline disconnects; In addition, for preventing that hydraulic support top from leaking coal (cash) and stopping up extraction hole and extraction pipeline, must setting can easy cleaning leak the device of coal.
For making pipeline and extraction hole easy to connect, ensure that sealing of hole does not tightly leak out simultaneously, design adopts strong magnets as linkage, back timber and the seal with elastometic washer of sealing of hole section pipeline.
Connect extraction pipeline between sealing of hole lengths of steel pipes, frame by PVC four-way, and leak the outlet of coal (cash) with the end opening of four-way as cleaning, end opening rubber stopper seal at ordinary times, opens rubber stopper when cleaning bastard coal.
The extraction pipeline of each hydraulic support is connected to the main pipe rail that traverses work plane, and main pipe rail is connected with the outside mine extraction of work plane system pipeline, forms frame and carries extraction system.
The present invention is in the time that work is used, underground gas extraction pipeline and frame are carried to supervisor to be connected, and carry by frame the drainage holes that arm connects back timber on each hydraulic support respectively, under the diffusion of the grid consisting of back timber upper groove median septum, gas is pooled to ventilative slotted eye by each extraction groove, finally extracts out by drainage holes, initiatively form negative pressuren zone on back timber top, gas in the coal of extraction top, reduces gas thereby reach before top coal is emitted, and has reduced gas emission while putting coal.Every hydraulic support top all forms a negative pressuren zone, and negative pressure connects by top cleat in coal, can high efficiency, the mash gas extraction of high concentration, improve greatly extraction efficiency.Hydraulic support is arranged side by side several, and frame carries supervisor and traverses whole fully mechanized coal face, and is connected with the outside mine extraction of work plane system pipeline, forms frame and carries top coal gas drainage system, has solved the problem that while putting coal, gas easily transfinites.
Because longwall top coal caving uses extensively in China's coal-mine, comprehensive coal face gas control problem is the bottleneck that affects comprehensive coal face output and safety condition.Therefore the present invention can reduce Gas Full-Mechanized Caving Face concentration, reduces gas exceeding limit situation, increase work plane Homes Using TV and output.Therefore, have promotional value in national colliery, contribute to improve comprehensive coal face safety condition, improve coal production, economic and social benefit is remarkable.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the top view of back timber in Fig. 1;
Fig. 3 is A-A sectional view in Fig. 2.
Detailed description of the invention
As shown in Figure 1, Figure 2 and Figure 3, fully mechanized coal face frame of the present invention carries top coal gas drainage system, comprise hydraulic support, hydraulic support top is provided with back timber 1, back timber 1 middle part is provided with groove 7 along its length one, back timber 1 below is provided with frame and carries supervisor 2, and back timber 1 is provided with the drainage holes 3 being communicated with groove 7, and drainage holes 3 and frame carry arm 4 by frame between carrying and being responsible for 2 and be connected.
Back timber 1 can make to be made into integration, reinforcement flange also can be set in the left and right sides at back timber 1, between back timber 1 upper surface and two reinforcement flanges, form the groove 7 of wide about 300mm, dark about 30mm, play the effect of less extraction gas leakage, depressed area is loose ventilating area, and drainage holes 3 is arranged on a certain position of depressed area.
Back timber 1 is provided with at least one dividing plate 5 along groove 7 bottom surface length directions, and dividing plate 5 separates groove 7 to form extraction groove 6, and back timber 1 is provided with a ventilative slotted eye 8 that all extraction grooves 6 are communicated with in both sides, drainage holes 3 place suitable for reading.
Hydraulic support is arranged side by side at least two, each hydraulic support includes base 9, on each base 9, be equipped with front hydraulic vertical prop 10 and rear hydraulic vertical prop 11, back timber 1 is located on front hydraulic vertical prop 10 and rear hydraulic vertical prop 11, frame carries supervisor 2 between front hydraulic vertical prop 10 and rear hydraulic vertical prop 11, and back timber 1 rear end is hinged with caving shield 12, and caving shield 12 bottoms are provided with and are provided with connecting rod 13 between base 9, back timber 1 front end is hinged with flip beam 14, between back timber 1 and flip beam 14 bottoms, is provided with overturning oil cylinder.
The width of groove 7 is 250-350mm, and the degree of depth is 25-35mm.
In the system of top coal caving hydraulic support and top board composition, hydraulic support is implemented to control to top board by top coal, simultaneously the pressure of top board is delivered on hydraulic support by top coal, and top coal will be moved, is out of shape in the process of the power of transmission, broken, inbreak and emitting.The crack of top coal starts from the bearing pressure peak region of rib front, and under Action of Fixed Abutment Pressure, top coal occurs to shear and tensile failure, occurs the preexisting crack in crack or expansion coal body.Along with the revolution of the advance of the face, top board is sunk, top cleat in coal further develops.After top coal enters into hydraulic support top, by inbreak gradually, and be deposited on support caving shield 12 and form a prose style free from parallelism.Top coal is continuous, a progressive destructive process from starting movement, breaking to inbreak, and along with the advance of the face, this process is also dynamically passed forward naturally.Grow and destructiveness according to top cleat in coal, along advance of the face direction, generally can be divided into Si Ge district: reset condition district I, compressive strain district II, draw and break split plot III and ⅣSi Ge district of prose style free from parallelism Mao Fang district.
Top-coal caving face is positioned at the bottom in coal seam, and gas has exploitation coal body and two sources of coal body, support top.Because the density of gas is 55.4% of atmospheric density, floating effect is obvious, thereby in loose coal, gather a large amount of free gas on integrated caving hydraulic support, back timber 1 and caving shield 12, form so-called " gas storehouse ", cause the hydraulic support phenomenon that transfinites more, and the phenomenon that transfinites on hydraulic support is difficult to solve with method of ventilation, therefore cause a large amount of gas in the time putting coal to gush out from coal discharge outlet, directly threaten work plane safety in production.
Can be found out by above analysis, the coal body of hydraulic support top is positioned at rib line rear side, break split plot and prose style free from parallelism Mao Fang district in drawing, cranny development is abundant, coal body good permeability, simultaneously, due to the floating effect of gas, in loose coal crack, will gather a large amount of high concentration gas herein, especially at the work plane of high gas layer, will form top coal " gas storehouse ".Therefore, form negative pressure at hydraulic support top, will extraction arrive a large amount of high concentration gas, thereby improve gas storehouse absolute altitude, reduce gas storehouse and coal discharge outlet gas density.
The present invention proposes that fully mechanized coal face frame is carried to top coal gas drainage system and carries out research and development.Basic conception is: on the back timber 1 of synthetical support, beat extraction hole, drainage device (comprising that frame carries supervisor 2 and frame carries arm 4) is installed, utilize top-coal caving face cleat in coal to grow, the feature that gas permeability of coal seam is good, above hydraulic support, form negative pressuren zone, force top coal gas to be migrated to negative pressuren zone, realize the top coal gas on integrated caving hydraulic support top is carried out to extraction, drainage device on each hydraulic support is connected by flexible conduit and is communicated with the total drainage system of mine, forms top coal gas drainage system.The target that the present invention will realize is: utilize top coal gas drainage system to play to dam top coal gas, reduce its gushing out to coal-face; Meanwhile, the low level dead angle gas that goaf retains is also to the migration of negative pressure band, and negative pressure band is put raising the gas absolute altitude in coal goaf, can reduce like this gas density of coal discharge outlet.In addition, be arranged on hydraulic support because frame carries extraction pipeline, after installing, can use continuously, continue extraction during the whole advance of the face, saved the work such as drilling, sealing of hole continuous, management and using is very convenient.
At the leading abutment pressure of coal-face and hydraulic moving stand repeatedly under supporting role, top coal is cut by longitudinal crack, and these cracks have certain Communicating.In the situation that roof seals, the gas that top coal is gushed out will spread to both direction, spread to goaf and spread to work plane by gap between frame.The through back timber 1 in longitudinal crack of top coal, because goaf is the scope of freedom, longitudinally cranny development, and there is the property of opening, and therefore more to the gas of goaf diffusion, thus coal discharge outlet gas exceeding limit caused.In the middle of comprehensive coal face back timber 1, have a depressed area, make to have a loose ventilating area on back timber 1, longitudinal crack of loose ventilating area and top coal is linked up, and this has created favourable objective condition for back timber 1 perforate extraction top coal gas.If form a negative pressuren zone on Sub-Level Caving back timber 1, by the Gas-Flow that changes top coal and treat Sub-Level Caving to.
The connection that frame carries extraction pipeline is also one of key technology of the application.First will ensure that extraction pipeline and extraction hole, frame top are easy to connect, reliable, also will make extraction pipeline between frame be connected firmly, while preventing from moving frame, pipeline disconnects; In addition, for preventing that hydraulic support top from leaking coal (cash) and stopping up extraction hole and extraction pipeline, must setting can easy cleaning leak the device of coal.
For making pipeline and extraction hole easy to connect, ensure that sealing of hole does not tightly leak out simultaneously, design adopts strong magnets as linkage, back timber 1 and the seal with elastometic washer of sealing of hole section pipeline.
Connect extraction pipeline between sealing of hole lengths of steel pipes, frame by PVC four-way, and leak the outlet of coal (cash) with the end opening of four-way as cleaning, end opening rubber stopper seal at ordinary times, opens rubber stopper when cleaning bastard coal.
The extraction pipeline of each hydraulic support is connected to the main pipe rail that traverses work plane, and main pipe rail is connected with the outside mine extraction of work plane system pipeline, forms frame and carries extraction system.
The present invention is in the time that work is used, underground gas extraction pipeline and frame are carried to supervisor 2 to be connected, and carry by frame the drainage holes 3 that arm 4 connects back timber 1 on each hydraulic support respectively, under the diffusion of the grid forming by back timber 1 upper groove 7 median septums 5, gas is pooled to ventilative slotted eye 8 by each extraction groove 6, finally extract out by drainage holes 3, initiatively form negative pressuren zone on back timber 1 top, gas in the coal of extraction top, reduce gas thereby reach before top coal is emitted, reduced gas emission while putting coal.Every hydraulic support top all forms a negative pressuren zone, and negative pressure connects by top cleat in coal, can high efficiency, the mash gas extraction of high concentration, improve greatly extraction efficiency.Hydraulic support is arranged side by side several, and frame carries supervisor 2 and traverses whole fully mechanized coal face, and is connected with the outside mine extraction of work plane system pipeline, forms frame and carries top coal gas drainage system, has solved the problem that while putting coal, gas easily transfinites.
More than show and described general principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and manual, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (4)
1. fully mechanized coal face frame carries top coal gas drainage system, comprise hydraulic support, hydraulic support top is provided with back timber, it is characterized in that: described back timber middle part is provided with groove along its length one, back timber below is provided with frame and carries supervisor, back timber is provided with the drainage holes being communicated with groove, and drainage holes and frame carry and between supervisor, carry arm by frame and be connected.
2. fully mechanized coal face frame according to claim 1 carries top coal gas drainage system, it is characterized in that: described back timber is provided with at least one dividing plate along groove floor length direction, dividing plate separates groove to form extraction groove, and back timber is provided with a ventilative slotted eye that all extraction grooves are communicated with in both sides, drainage holes place suitable for reading.
3. fully mechanized coal face frame according to claim 1 and 2 carries top coal gas drainage system, it is characterized in that: described hydraulic support is arranged side by side at least two, each hydraulic support includes base, on each base, be equipped with front hydraulic vertical prop and rear hydraulic vertical prop, described back timber is located on front hydraulic vertical prop and rear hydraulic vertical prop, frame carries supervisor between front hydraulic vertical prop and rear hydraulic vertical prop, top beam rear end is hinged with caving shield, caving shield bottom is provided with and is provided with connecting rod between base, back timber front end is hinged with flip beam, between back timber and flip beam bottom, be provided with overturning oil cylinder.
4. fully mechanized coal face frame according to claim 1 and 2 carries top coal gas drainage system, it is characterized in that: the width of described groove is 250-350mm, and the degree of depth is 25-35mm.
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Cited By (9)
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| CN104763455A (en) * | 2015-03-06 | 2015-07-08 | 河南理工大学 | Frame-mounted gas drainage type top coal caving hydraulic support |
| CN104763461A (en) * | 2015-03-06 | 2015-07-08 | 河南理工大学 | Hydraulic bracket-carrying gas drainage device for fully mechanized top coal caving |
| CN104806284A (en) * | 2015-03-06 | 2015-07-29 | 河南理工大学 | Intelligent top-cave hydraulic support gas drainage device |
| CN105179000A (en) * | 2015-10-27 | 2015-12-23 | 中国神华能源股份有限公司 | Hydraulic support |
| CN106761580A (en) * | 2017-01-23 | 2017-05-31 | 中国矿业大学 | A kind of soft country rock Gas Full-Mechanized Caving Face pumping method |
| CN108979619A (en) * | 2018-09-14 | 2018-12-11 | 华北科技学院 | The determination method of longwall top coal caving lead abutment pressure peak position |
| CN111500334A (en) * | 2020-04-18 | 2020-08-07 | 张宏 | High-combustion-rate coal briquette with coal slag not easy to crack |
| CN113653527A (en) * | 2021-09-17 | 2021-11-16 | 中煤科工集团重庆研究院有限公司 | Method for extracting top coal gas during fully mechanized top coal caving period of extra-thick coal seam |
| WO2022022056A1 (en) * | 2020-07-29 | 2022-02-03 | 煤炭科学研究总院 | Light electric support for coal mine |
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