CN105715272A - Fully-mechanized caving mining method for lower slice of ultra-thick hard coal - Google Patents
Fully-mechanized caving mining method for lower slice of ultra-thick hard coal Download PDFInfo
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Abstract
The invention discloses a fully-mechanized caving mining method for a lower slice of ultra-thick hard coal. The fully-mechanized caving mining method comprises steps as follows: the lower slice is subjected to roadway excavation, and top coal is reserved on a roadway of the lower slice; fully-mechanized caving equipment is mounted in the roadway of the lower slice; coal cutting is performed at the lower part of the lower slice by a coal cutter; caving coal recovery is performed on the top coal at the upper part of the lower slice. The top coal is taken as a roof for the fully-mechanized caving, mesh placement is not needed, the top coal is taken as caving coal to be recovered when moved behind a support, so that the safety of the roof is guaranteed, and the coal resource is recovered. The recovery rate of the coal resource is increased, the hidden danger of spontaneous combustion in a goaf is reduced, the safety is better, the efficiency is high, the benefit is good, and a new technology, a new method and new experience are provided for safe and efficient mining of the lower slice after a higher slice of the ultra-thick hard coal is subjected to fully-mechanized caving mining.
Description
Technical field
The present invention relates to the technical field of coal mining, particularly relate to the recovery method of a kind of special thick hard coal lower leaf.
Background technology
The state of the art of China's super high seam exploitation:
Super high seam is generally taked following four recovery method by current China: layering combine adopt, longwall top coal caving, large cutting height workface and strip mining transformation.Wherein layering fully-mechnized mining method tunnelling and comprehensive back production Roof Control difficulty of adopting are all relatively big, and support cost is high, and safety is poor, but also wants lapping.Longwall top coal caving method top coal needs presplit blasting time too thick, and bulk is many, and caving ability difference coal recovery rate is low, the easy spontaneous combustion in goaf；The hydraulic support that large cutting height workface method only has 7.2m, 8.8m high due to domestic current maximum mining height is also developed, and the super high seam exceeding this height can not all reclaim, and mining height is restricted, and ore deposit pressure is big, easy side fall roof；If strip mining transformation method coal seam is buried too deep, stripping-to-ore ratio is too big, both uneconomical, is also unfavorable for environmental conservation.These four recovery method all has bigger drawback.
Certain super high seam current mining:
Panel, recombination region two gross area 4.24 square kilometres of this super high seam.Overall thickness of coal bed is 9.63-10.35m, and average thickness is 10.0m, and inclination angle is 1-3 °, and buried depth is 76-106m, and recoverable reserves is 70,800,000 tons, and coal seam Protodyakonov coefficient is about 3, and joint fissure aplasia, coal seam toughness are better.
As it is shown in figure 1, this panel adopts layering to combine the recovery method adopted in the original plan, the coal seam thick to 10m, higher slice is combined and is adopted back production 4m, and 2m vacation top is stayed in centre, and lower leaf is combined and adopted back production 4m (such as Fig. 1).These panel higher slice both wings totally nine fully mechanized coal faces are had been carried out back production by March calendar year 2001 in May, 2005, and higher slice is visible coal reserve 28,300,000 tons, remain coal amount 42,500,000 tons.Owing to lower leaf exploits difficulty too greatly, safety is too poor, the higher slice exploitation time lower leaf of complete existing nearly 10 years so far never exploitation.If continuing by back production lower leaf in the original plan, not only wasting the thick coal resources (about 10,200,000 tons) of 2m, and a large amount of coal is retained in goaf and also can cause the major hidden danger of spontaneous combustion.
A kind of improve the coal resources rate of extraction therefore, it is necessary to design and can guarantee that special thick the comprehensive of hard coal lower leaf of safety and high efficiency puts back to mining method.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of improve the coal resources rate of extraction and can guarantee that special thick the comprehensive of hard coal lower leaf of safety and high efficiency puts back to mining method.
Technical scheme provides a kind of longwall top coal caving method of special thick hard coal lower leaf, comprises the following steps:
Lower leaf is carried out tunnelling, top coal reserve on the described tunnel of described lower leaf；
Install to combine in the described tunnel of described lower leaf and put equipment；
The bottom of described lower leaf is adopted coal-winning machine coal cutting；
Sub-Level Caving is adopted to reclaim in top coal described in the top of described lower leaf.
Further, described coal cutting is highly 4m, and the thickness of described Sub-Level Caving is 2m.
Further, adopting adjacent frame manual operation to carry out mobile hydraulic support, it is mobile that described hydraulic support follows described coal-winning machine wiping top, and described hydraulic support is used for supporting roof.
Further, after mobile described hydraulic support, forward scraper transporter is promoted.
Further, described Sub-Level Caving pulls rear portion scratch board conveyor after reclaiming.
Further, described coal-winning machine adopts end beveled feed, two-ways coal cutting.
Further, feed of cutting sth. askew described in further includes steps of
Cut sth. askew into cutter, before entering cutter, the head segment distance rib of forward scraper transporter is relative to tail section farther out, form bending section and straightway, after the described rib of the saturating described head section of described coal mining machine cut, along described bending section feed, described coal-winning machine progresses into described rib, until described coal-winning machine moves to described straightway；
Cutting Triangle Coal, described head moves forward so that described forward scraper transporter keeps straight, and described coal-winning machine moves to the direction of described head section and cuts Triangle Coal.
Further, described in cut Triangle Coal after, described coal-winning machine moves to the described tail section of described forward scraper transporter, the normal coal cutting of described coal-winning machine.
Further, described longwall top coal caving adopt one adopt one put, parallel operations, dual-wheel sequential put coal.
Further, described top coal puts coal by coal-caving supporter, and described coal-caving supporter includes rear tail boom and plate, and described rear tail boom offers coal discharge outlet, and described plate is used for being turned on and off described coal discharge outlet.
After adopting technique scheme, have the advantages that.
Due to the fact that top coal as combining the top board adopted, it is not necessary to lapping, reclaim as Sub-Level Caving after having arrived frame, both ensure that roof safety, reclaimed again coal resources.Improve coal recovery rate, reduce the hidden danger of Study on Protection of Spontaneous Combustion, safety is better, and efficiency is high, profitable, and after special thick hard coal higher slice fully-mechnized mining, the safe and efficient back production of lower leaf provides new technique, new method, new experience.
Accompanying drawing explanation
Fig. 1 is the generalized section of the comprehensive recovery method adopted of layering of certain special thick hard coal；
Fig. 2 is the generalized section of the recovery method of special thick hard coal in one embodiment of the invention；
Fig. 3 is the flow chart of the longwall top coal caving method of special thick hard coal lower leaf in one embodiment of the invention；
Fig. 4 is the initial state figure of the feed of cutting sth. askew of special thick hard coal lower leaf in one embodiment of the invention；
Fig. 5 is the profile of A-A in Fig. 4；
Fig. 6 is the cutting sth. askew into the state diagram of cutter step of the feed of cutting sth. askew of special thick hard coal lower leaf in one embodiment of the invention；
Fig. 7 is the profile of B-B in Fig. 6；
Fig. 8 is the state diagram cutting Triangle Coal step of the feed of cutting sth. askew of special thick hard coal lower leaf in one embodiment of the invention；
Fig. 9 is the profile of C-C in Fig. 8；
Figure 10 is the state diagram of the normal coal cutting of special thick hard coal lower leaf in one embodiment of the invention；
Figure 11 is the profile of D-D in Figure 10.
Accompanying drawing labelling synopsis:
1-rib 2-coal-winning machine 3-front scraper conveyor
4-rolls left the right cylinder of a 5-
Detailed description of the invention
The specific embodiment of the present invention is further illustrated below in conjunction with accompanying drawing.
It is the generalized section of the recovery method of special thick hard coal in one embodiment of the invention referring to Fig. 2, Fig. 2.The super high seam that gross thickness is 10m is divided into higher slice and lower leaf.Higher slice adopts back production 4m already by combining.Lower leaf thick for 6m is adopted longwall top coal caving method, mining height 4m, Sub-Level Caving 2m.Coal seam thick for this 2m can as combining the top board adopted, it is not necessary to lapping, reclaims as Sub-Level Caving, both ensure that roof safety, reclaimed again coal resources after having arrived frame.Namely by original plan recovery method " higher slice combine adopt 4m, centre stay 2m vacation top, lower leaf again combine adopt 4m " change into " and higher slice combine adopt 4m, lower leaf combine puts 6m " recovery method.
As it is shown on figure 3, Fig. 3 is the flow chart of the longwall top coal caving method of special thick hard coal lower leaf in one embodiment of the invention, specifically include following steps:
Step S101: lower leaf is carried out tunnelling, top coal reserve on the described tunnel of described lower leaf；
Step S102: install to combine in the described tunnel of described lower leaf and put equipment；
Step S103: the bottom of described lower leaf is adopted coal-winning machine coal cutting；
As in figure 2 it is shown, in the present embodiment, coal cutting is highly 4m.
It is preferred that coal cutting can be highly 3-5m.
Step S104: adopt Sub-Level Caving to reclaim in top coal described in the top of described lower leaf.
As in figure 2 it is shown, in the present embodiment, the thickness of described Sub-Level Caving is 2m.
It is preferred that the thickness of Sub-Level Caving can be 2-3m.
Due to the fact that top coal as combining the top board adopted, it is not necessary to lapping, reclaim as Sub-Level Caving after having arrived frame, both ensure that roof safety, reclaimed again coal resources.Improve coal recovery rate, reduce the hidden danger of Study on Protection of Spontaneous Combustion, safety is better, and efficiency is high, profitable, and after special thick hard coal higher slice fully-mechnized mining, the safe and efficient back production of lower leaf provides new technique, new method, new experience.
Preferably, as in figure 2 it is shown, adopt adjacent frame manual operation to carry out mobile hydraulic support, it is mobile that described hydraulic support follows described coal-winning machine wiping top, and described hydraulic support is used for supporting roof.
Wherein, during normal propelling when stability of cavern roof, adjacent frame manual operation is adopted to carry out mobile hydraulic support, hydraulic support must not front roll (top cutter) 3 framves of delayed coal-winning machine, strict implement is followed described coal-winning machine and is taken a step to wipe top mobile hydraulic support, it is ensured that hydraulic support front top plate is complete.Must closelying follow front roll during preliminary roof caving, roof cracking or periodic weighting and carry out mobile hydraulic support, the step pitch of mobile hydraulic support is 0.865m.
Preferably, as in figure 2 it is shown, after mobile described hydraulic support, promote forward scraper transporter.
Wherein, work surface coal is transported by anterior, rear portion scratch board conveyor, through being arranged on after with elevating conveyor, crusher in crushing becomes fritter, is finally reprinted on crossheading rubber conveyer by elevating conveyor.Front scraper conveyor is for transporting the coal that coal-winning machine is cut off, and rear portion drag conveyor is for transporting the coal of Sub-Level Caving.Promote forward scraper transporter, after mobile hydraulic support, it is necessary to assure the forward scraper transporter delayed coal-winning machine bending section distance no less than 23m.The step pitch promoting forward scraper transporter is 0.865m.Manually promote forward scraper transporter in accordance with the following methods: first by the head of forward scraper transporter to work surface pushing and sliding, then by the tail of forward scraper transporter to work surface pushing and sliding, and advancing jack gradually to be released according to launch direction, forbid to elapse transporter from two to centre, in order to avoid causing forward scraper transporter intermediate muster, bridging.
Preferably, as in figure 2 it is shown, after the recovery of described Sub-Level Caving, pull rear portion scratch board conveyor.
Wherein, pulling rear portion scratch board conveyor, delayed to put coal point 15m carried out above, the step pitch pulling rear portion scratch board conveyor is 0.865m, pulled to work surface by the head of rear portion scratch board conveyor or pulled to work surface by tail, the bending section of rear portion scratch board conveyor must not less than 23m, and maximum horizontal bends 1～2 °.When coal mining machine cut to termination and complete feed, promote the head or the tail that pull rear portion scratch board conveyor after forward scraper transporter, operation of trying to stop people from fighting each other, forbid to pull rear portion scratch board conveyor from two to centre.Draw shifting to put and to keep straight in place, shifting when rear portion scratch board conveyor shuts down, must not be drawn.
Above-mentioned operation can be: coal-winning machine coal cutting → shifting frame → push away forward scraper transporter → put coal → draw rear portion scratch board conveyor.
Preferably, described coal-winning machine adopts end beveled feed, two-ways coal cutting.
Further, feed of cutting sth. askew described in further includes steps of
Cutting sth. askew into cutter, before entering cutter, the head segment distance rib of forward scraper transporter is relative to tail section farther out, form bending section and straightway, after the described rib of coal mining machine cut saturating head section, along bending section feed, coal-winning machine progresses into rib, until coal-winning machine moves to straightway；
Wherein, as illustrated in figures 4-5, for the initial state figure of the feed of cutting sth. askew of special thick hard coal lower leaf.Fig. 4 is the cross section of the work surface being perpendicular to Fig. 2.During initial state, head section (in Fig. 4 the part in left side) the distance rib of forward scraper transporter 3 relative to tail section (in Fig. 4 the part on right side) farther out, forms bending section 31 and straightway 32, and coal-winning machine 2 cuts the rib 1 of head section.Now, the cylinder 4 that rolls left is at top board, and right cylinder 5 is at base plate.
As shown in fig. 6-7, cutting sth. askew into the state diagram of cutter step for the feed of cutting sth. askew of special thick hard coal lower leaf.After coal machine 2 cuts the rib 1 of head section, the cylinder 4 that rolls left is fallen to base plate, and right cylinder 5 is raised up to top board, reversely draws, and along bending section 31 feed of forward scraper transporter 3, rib 1 cut gradually by coal-winning machine 2, and fuselage stops traction after fully entering straightway 32.Owing to coal-winning machine 2 is along bending section 31 feed, therefore as shown in Figure 6, rib 1 defines one section of Triangle Coal.
Cutting Triangle Coal, head moves forward so that forward scraper transporter keeps straight, and coal-winning machine moves to the direction of head section and cuts Triangle Coal.
Wherein, as Figure 8-9, for the state diagram cutting Triangle Coal step of the feed of cutting sth. askew of special thick hard coal lower leaf.Coal-winning machine 2 is cut sth. askew after cutter completes, head moves forward, forward scraper transporter 3 is made to keep straight, the cylinder 4 that rolls left of coal-winning machine 2 is raised up to top board, and right cylinder 5 is fallen to base plate, the anteriorly head section direction traction coal cutting of scratch board conveyor 3, after cutting rib, base plate (referring to Figure 11) is down to by the cylinder 4 that rolls left, and carrys out flyback cutter two to three times, cuts flat tail base plate.
In the present embodiment, after cutting Triangle Coal, the tail section of coal-winning machine anteriorly scratch board conveyor moves, the normal coal cutting of coal-winning machine.
Wherein, as shown in figs. 10-11, for the state diagram of the normal coal cutting of special thick hard coal lower leaf.After coal-winning machine 2 cuts the rib 1 of head, the cylinder 4 that rolls left is fallen to base plate, and right cylinder 5 is raised up to top board, the tail section direction traction coal cutting of coal-winning machine 2 portion's scratch board conveyor 3 further along, follows coal-winning machine 2 mobile hydraulic support, supporting roof.
It is preferred that described longwall top coal caving adopt one adopt one put, parallel operations, dual-wheel sequential put coal.
Specifically, when coal-winning machine is from head toward tail coal cutting, start to put coal from head, it is put into tail and stops；During from tail toward head coal cutting, start to put coal from tail.
Further, described top coal puts coal by coal-caving supporter, and described coal-caving supporter includes rear tail boom and plate, and described rear tail boom offers coal discharge outlet, and described plate is used for being turned on and off described coal discharge outlet.
Wherein, transition frame (2 frame) and two ends file leader's frame (8 frame) totally 10 framves do not put coal.Putting coal every time and open two coal discharge outlets, spacing 10 frame puts coal, utilizes the rear tail boom of coal-caving supporter and plate to put coal, is put into after seeing cash and closes the door.Two sole duties of per tour are put coal work and are put coal, put the delayed shifting frame 10 frame Sub-Level Caving of coal work for one, and another name is put coal work and put coal work 10 frame apart from previous name and simultaneously put coal.
The a certain specific embodiment of the present invention describes as follows:
Da-liuta coal mine live chickens rabbit well recombination region two panel lower leaf head adopts 12 times, face, 202 comprehensive coal faces, and run of mine coal seam grand mean coal thickness 10.0m, higher slice has adopted average coal thickness 4.0m；Lower leaf remains average coal thickness 6.0m, and on 12, the 202 former overlying basement rock of work surface subsided in 2005.12 times 202 face length 249.8m of lower leaf, propelling length 1124.5m, area 0.28 square kilometre, seam inclination 1-3 °, buried depth 63.4-99.3m.Work surface selects north coal ZFY10200/25/42 hydraulic support, 7LS6C/LWS738 type double-ended shearer, and JOY2 × 2 × 1050KW (Sub-Level Caving) front and rear part drag conveyor is as the main corollary equipment produced.
This work surface adopts longwall top coal caving technique, combines and adopts back production 4.0m, Sub-Level Caving 2.0m.Top coal thick for this 2m is first as combining the top board adopted, it is prevented that leak cash roof fall before frame, pushes away with support and adopts Sub-Level Caving to reclaim after having been moved to frame, emit leakage, reclaimed again coal resources before so can preventing frame, can reduce again the hidden danger that goaf is got angry.This fully mechanized coal face back production 320 meters, average coal cutting every day 12 cutter, average daily yield 2.0 ten thousand tons.Odd-numbered day the highest coal cutting 22 cutter, odd-numbered day maximum output is 3.5 ten thousand tons.Working face extraction process do not have periodic weighting, it does not have the various problems such as clumb, leakage cash occur, field practice is respond well, and actual mining very safety is smoothly efficiently.This work surface coal recovery rate reaches 90% (improve 23 percentage points than former scheme), and this work surface is many reclaiming coal resources about 46.7 ten thousand tons altogether, calculates by 150 yuan of profits of ton coal, many creation economic benefits about 70,050,000 yuan.
The invention have the advantages that
(1) accumulate new experience for special thick hard coal seam exploitation, new technique.From the whole country, after the thick hard coal seam of spy first adopts higher slice, lower leaf adopts longwall top coal caving, and the whole nation is beyond example temporarily, and the innovation of this technology is respond well, and the seam mining for conditions of similarity provides valuable practical experience, has certain application value.
(2) when when utilizing higher slice back production, jumbo is to the destruction of ground coal and lower leaf back production, support supports the destruction to top coal repeatedly, it is achieved that being sufficiently destroyed top coal during lower leaf longwall top coal caving, it is ensured that the good caving ability of top coal.This is also an important innovative point, is also at home and abroad propose first.
(3) resource recovery is of a relatively high.Top coal caving top-coal recovery rate is by 70% consideration, and comprehensive recovery is up to about 90%.Selecting with lower leaf to combine and adopt process for stoping and stay and set compared with top coal thick for 2m do not adopt, the coal resources of 7,140,000 tons can be reclaimed in whole recombination region more, and ton coal presses 150 yuan of benefit calculation, creates the economic benefit of about 10.7 hundred million yuan more.
(4) avoid top coal thick for 2m to lose, greatly reduce the something lost coal in goaf, greatly reduce the hidden danger of Study on Protection of Spontaneous Combustion.
(5) employing Longwall top coal caving technology technique solves to combine under this special geologic condition and adopts tip to face distance scope Roof Control problem, has effectively stopped the generation of leakage cash and roof fall accident.Exploiting lower leaf according to high working face full-seam mining, fully mechanized coal face will not have solid top plate, and the spoil inbreak of higher slice goaf is difficult to back production.And adopt longwall top coal caving " directly top " to be generally top coal 2 meters thick, this part coal is first as combining the top board adopted, cash roof fall is leaked before preventing frame, push away with support and after having been moved to frame, adopt Sub-Level Caving to reclaim, reach both to prevent leakage cash roof fall before frame, having reclaimed again the target of coal resources, roof control is respond well.
(6) special thick hard coal higher slice is combined and is adopted lower leaf and combine the process for stoping put, and during higher slice back production, base plate does not need lapping, without presplitting during lower leaf Sub-Level Caving, realize the safety and high efficiency of lower leaf surplus resources, cost is low, and efficiency is high, improves overall economic efficiency.
(7) when at present whole nation coal situation is bad, alleviate well alive and continue the problem of anxiety, not only enable the fat coal back production of recombination region lower leaf more than 3,000 ten thousand tons, solve again pressure stubble problem simultaneously, make 22 coals also be released.
(8) coal thickness is changed strong adaptability by longwall top coal caving lower leaf.The super high seam relatively big for Coal Seam Thickness Change, hardness is bigger, Full-mechanized Mining Face propelling is affected little by Coal Seam Thickness Change.When changing for live chickens rabbit well 12 coal recombination region lower leaf coal thickness local, longwall top coal caving is adopted to can be good at adapting to Coal Seam Thickness Change.
(9) the new recovery method set advantage of separate zone production and Sub-Level Caving, finds a new process for stoping for the special thick safe efficient back production of hard coal.
Above-described is only principles of the invention and preferred embodiment.It should be pointed out that, for the person of ordinary skill of the art, on the basis of the principle of the invention, it is also possible to make other modification some, also should be regarded as protection scope of the present invention.
Claims (10)
1. the longwall top coal caving method of a special thick hard coal lower leaf, it is characterised in that comprise the following steps:
Lower leaf is carried out tunnelling, top coal reserve on the described tunnel of described lower leaf；
Install to combine in the described tunnel of described lower leaf and put equipment；
The bottom of described lower leaf is adopted coal-winning machine coal cutting；
Sub-Level Caving is adopted to reclaim in top coal described in the top of described lower leaf.
2. special thick the comprehensive of hard coal lower leaf according to claim 1 puts back to mining method, it is characterised in that described coal cutting is highly 4m, and the thickness of described Sub-Level Caving is 2m.
3. the longwall top coal caving method of special thick hard coal lower leaf according to claim 1, it is characterised in that adopting adjacent frame manual operation to carry out mobile hydraulic support, it is mobile that described hydraulic support follows described coal-winning machine wiping top, and described hydraulic support is used for supporting roof.
4. the longwall top coal caving method of special thick hard coal lower leaf according to claim 1, it is characterised in that after mobile described hydraulic support, promote forward scraper transporter.
5. the longwall top coal caving method of special thick hard coal lower leaf according to claim 1, it is characterised in that described Sub-Level Caving pulls rear portion scratch board conveyor after reclaiming.
6. the longwall top coal caving method of the special thick hard coal lower leaf according to any one of claim 1-5, it is characterised in that described coal-winning machine adopts end beveled feed, two-ways coal cutting.
7. the longwall top coal caving method of special thick hard coal lower leaf according to claim 6, it is characterised in that described in feed of cutting sth. askew further include steps of
Cut sth. askew into cutter, before entering cutter, the head segment distance rib of forward scraper transporter is relative to tail section farther out, form bending section and straightway, after the described rib of the saturating described head section of described coal mining machine cut, along described bending section feed, described coal-winning machine progresses into described rib, until described coal-winning machine moves to described straightway；
Cutting Triangle Coal, described head moves forward so that described forward scraper transporter keeps straight, and described coal-winning machine moves to the direction of described head section and cuts Triangle Coal.
8. the longwall top coal caving method of special thick hard coal lower leaf according to claim 7, it is characterised in that described in cut Triangle Coal after, described coal-winning machine moves to the described tail section of described forward scraper transporter, the normal coal cutting of described coal-winning machine.
9. the longwall top coal caving method of special thick hard coal lower leaf according to claim 6, it is characterised in that described longwall top coal caving adopt one adopt one put, parallel operations, dual-wheel sequential put coal.
10. the longwall top coal caving method of the special thick hard coal lower leaf according to any one of claim 1-5, it is characterized in that, described top coal puts coal by coal-caving supporter, described coal-caving supporter includes rear tail boom and plate, offering coal discharge outlet on described rear tail boom, described plate is used for being turned on and off described coal discharge outlet.
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| CN201610210161.2A CN105715272A (en) | 2016-04-06 | 2016-04-06 | Fully-mechanized caving mining method for lower slice of ultra-thick hard coal |
| CN202011043111.2A CN111946345A (en) | 2016-04-06 | 2016-04-06 | Fully-mechanized caving mining method for layering under ultra-thick hard coal |
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| CN106948818A (en) * | 2017-05-12 | 2017-07-14 | 河南理工大学 | Coal method is put in a kind of many wheel layerings |
| CN107780964A (en) * | 2017-10-09 | 2018-03-09 | 中国神华能源股份有限公司 | Fully-mechanized mining working crossheading ground coal recovery system and recovery method |
| CN108716401A (en) * | 2018-06-28 | 2018-10-30 | 中国矿业大学 | A kind of thick sandstone separate zone production method |
| CN111101942A (en) * | 2018-10-29 | 2020-05-05 | 西安科技大学 | Method and system for recovering residual coal on lower wall in caving coal mining of inclined extra-thick coal seam |
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| CN113404492A (en) * | 2021-07-22 | 2021-09-17 | 河南神火煤电股份有限公司 | Fully-mechanized mining working face soft channel dust settling system and method |
| RU2772836C1 (en) * | 2021-10-19 | 2022-05-26 | Федеральное государственное бюджетное образовательное учреждение высшего образования «Кузбасский государственный технический университет имени Т.Ф.Горбачева» (КузГТУ) | Method for developing thick slow and inclined coal seams with division into inclined layers |
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| CN113738364B (en) * | 2021-09-26 | 2022-09-30 | 中国矿业大学 | Intelligent fully-mechanized top coal caving hydraulic support teaching-free memory coal caving system |
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| CN106948818A (en) * | 2017-05-12 | 2017-07-14 | 河南理工大学 | Coal method is put in a kind of many wheel layerings |
| CN107780964A (en) * | 2017-10-09 | 2018-03-09 | 中国神华能源股份有限公司 | Fully-mechanized mining working crossheading ground coal recovery system and recovery method |
| CN108716401A (en) * | 2018-06-28 | 2018-10-30 | 中国矿业大学 | A kind of thick sandstone separate zone production method |
| CN111101942A (en) * | 2018-10-29 | 2020-05-05 | 西安科技大学 | Method and system for recovering residual coal on lower wall in caving coal mining of inclined extra-thick coal seam |
| CN112127887A (en) * | 2020-09-23 | 2020-12-25 | 国家能源集团宁夏煤业有限责任公司 | Coal mining method |
| CN113404492A (en) * | 2021-07-22 | 2021-09-17 | 河南神火煤电股份有限公司 | Fully-mechanized mining working face soft channel dust settling system and method |
| CN113404492B (en) * | 2021-07-22 | 2023-08-08 | 河南神火煤电股份有限公司 | Soft channel dust fall system and method for fully mechanized coal mining face |
| RU2772836C1 (en) * | 2021-10-19 | 2022-05-26 | Федеральное государственное бюджетное образовательное учреждение высшего образования «Кузбасский государственный технический университет имени Т.Ф.Горбачева» (КузГТУ) | Method for developing thick slow and inclined coal seams with division into inclined layers |
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