CN102877872A - Heavy large-mining-height full-protection large-dip-angle long-wall fully mechanized caving face automatic control supporting equipment - Google Patents
Heavy large-mining-height full-protection large-dip-angle long-wall fully mechanized caving face automatic control supporting equipment Download PDFInfo
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Abstract
The invention discloses heavy large-mining-height full-protection large-dip-angle long-wall fully mechanized caving face automatic control supporting equipment. A plurality of middle brackets are arranged on a caving face; transition brackets and leader brackets are respectively and sequentially arranged at the both sides of the middle brackets; look-ahead brackets are respectively arranged inside an upper gateway and a lower gateway; a group of end head brackets are arranged at the part, which is transversely aligned to the leader brackets, of the lower gateway; an anti-falling device is connected between top beams of the two adjacent brackets; bracket turning devices are respectively connected between the front ends and back ends of bases of the two adjacent brackets; an inclined-draw anti-falling device is connected between the top beam of the bracket at the lower side and the base of the bracket at the upper side; a front roller anti-sliding device and a back roller anti-sliding device are respectively connected between the front ends and back ends of the bases of the brackets, and a front roller and a back roller; auxiliary pushing mechanisms are respectively arranged at one sides of the leader brackets and the bases of the end head brackets; rigid handrail and stepping boards among the brackets are arranged at the both sides of a side pavement inside the brackets; and a stretchable protection network is arranged between every two front stand posts of the brackets. According to the large-mining-height full-protection large-dip-angle long-wall fully mechanized caving face, the working resistance of the bracket is more than 7000 KN; the length applicable to the caving surface is more than 200 m; the inclination angle is more than 50 degree; and the thickness of a coal layer is more than 1.8 m.
Description
Technical field
The present invention relates to a kind of fully mechanized coal face support apparatus, relate in particular to the large mining height full protection of a kind of heavy type high inclination-angle longwell fully mechanized coal face and automatically control support apparatus.
Background technology
At present, large inclination working surface is shortwall under the coal mine, generally is no more than 100～150 meters; Large tilt angle compound mining coordinative composition of equipments parameter mostly is SGZ800, and working resistance is no more than 6500KN, and working resistance is larger, and the weight of support is larger, and sliding force is larger, and the suffered bending power of equipment is larger, and the design of equipment and anti-skid difficulty are larger; The maximum angle that the high inclination-angle sublevel caving hydrau lic support is used does not all surpass 48 degree; Inclined Full-mechanized Mining Face adopts only face timbering or work plane to add end support more; Inclined Full-mechanized Mining Face adopts adjacent frame manually to control.
The shortcoming of above-mentioned prior art is: be difficult to be applicable to large mining height full protection high inclination-angle longwell fully mechanized coal face.
Summary of the invention
The purpose of this invention is to provide a kind of heavy large mining height full protection high inclination-angle longwell fully mechanized coal face that is applicable to large mining height full protection high inclination-angle longwell fully mechanized coal face and automatically control support apparatus.
The objective of the invention is to be achieved through the following technical solutions:
The large mining height full protection of heavy type of the present invention high inclination-angle longwell fully mechanized coal face is controlled support apparatus automatically, comprise many supports, the work plane place is provided with many intermediate supports, the both sides of intermediate support are provided with respectively 1 to 2 transition bracket and 2 to 4 crab bearers successively, be respectively equipped with 2 to 4 groups of advance timberings in upper crossheading and the lower crossheading, every group of advance timbering comprises two advance timberings that are arranged side by side, and the position of laterally aliging with crab bearer, vertically align with advance timbering in lower crossheading place is provided with one group of face end support;
Described one group of face end support comprises the two frame end head brackets that are arranged side by side, and wherein the face end support away from work plane is provided with four rear columns, four central posts, two front columns, and the face end support of close work plane is provided with four rear columns, four central posts;
The length of described work plane greater than 200 meters, inclination angle greater than 50 °, coal seam thickness greater than 1.8 meters, the supporting height of described support greater than 1.8 meters, working resistance greater than 7000KN;
Be connected with tilting prevention device between the back timber of adjacent two supports;
Be connected with respectively the accent rack device between the front-end and back-end of the base of adjacent two supports;
Be connected with the oblique pull tilting prevention device between the back timber of lower side stand and the base of upper side stand;
Be connected with respectively front slide shoe and rear slide shoe between the front-end and back-end of the base of support and front slide and the rear slide;
One side of the base of crab bearer and face end support is respectively equipped with assistant pushing mechanism;
The both sides, sidewalk are provided with foot rest between rigidity handrail and frame in the support frame;
Be provided with flexible protective screening between the front column of support.
As seen from the above technical solution provided by the invention, the heavy large mining height full protection high inclination-angle longwell fully mechanized coal face that the embodiment of the invention provides is controlled support apparatus automatically, the length that can be applicable to work plane greater than 200 meters, inclination angle greater than 50 °, the coal seam thickness large mining height full protection high inclination-angle longwell fully mechanized coal face greater than 1.8 meters.
Description of drawings
The heavy large mining height full protection high inclination-angle longwell fully mechanized coal face that Fig. 1 provides for the embodiment of the invention is controlled the layout schematic diagram of support apparatus automatically;
Fig. 2 is the structural representation of intermediate support in the embodiment of the invention;
Fig. 3 is the structural representation of crab bearer in the embodiment of the invention;
Fig. 4 a is the structural representation of the face end support of close work plane in the embodiment of the invention;
Fig. 4 b is away from the structural representation of the face end support of work plane in the embodiment of the invention;
Fig. 4 c is the layout schematic diagram of one group of face end support in the embodiment of the invention;
Fig. 5 a is the side structure schematic diagram of three advance timberings in the embodiment of the invention;
Fig. 5 b is the plane structure schematic diagram of three advance timberings in the embodiment of the invention;
Fig. 6 is the structural representation of the tilting prevention device between the back timber of adjacent two supports in the embodiment of the invention;
Fig. 7 is the structural representation of the accent rack device between the front-end and back-end of the base of adjacent two supports in the embodiment of the invention;
Fig. 8 is the structural representation of the oblique pull tilting prevention device between the base of the back timber of lower side stand in the embodiment of the invention and upper side stand;
Fig. 9 is front-end and back-end and the front slide shoe between front slide and the rear slide and the structural representation of rear slide shoe of the base of embodiment of the invention medium-height trestle;
Figure 10 is the structural representation of the base of crab bearer in the embodiment of the invention;
Figure 11 is the structural representation of the assistant pushing mechanism of face end support in the embodiment of the invention;
Figure 12 is the structural representation of the flexible protective screening between front column in the embodiment of the invention;
Figure 13 is the structural representation of foot rest between the rigidity handrail of both sides, sidewalk in the embodiment of the invention medium-height trestle frame and frame.
Among the figure: 1, intermediate support, 2, transition bracket, 3, crab bearer, 4, face end support, 5, advance timbering, 6, rear column, 7, central post, 8, front column, 9, tilting prevention device, 10, transfer rack device, 11, the oblique pull tilting prevention device, 12, front slide shoe, 13, rear slide shoe, 14,, 15, assistant pushing mechanism, 16, flexible protective screening, 17, the rigidity handrail, 18, foot rest between frame.
The specific embodiment
The below will be described in further detail the embodiment of the invention.
The large mining height full protection of heavy type of the present invention high inclination-angle longwell fully mechanized coal face is controlled support apparatus automatically, and its better specific embodiment is:
Comprise many supports, the work plane place is provided with many intermediate supports, the both sides of intermediate support are provided with respectively 1 to 2 transition bracket and 2 to 4 crab bearers successively, be respectively equipped with 2 to 4 groups of advance timberings in upper crossheading and the lower crossheading, every group of advance timbering comprises two advance timberings that are arranged side by side, and the position of laterally aliging with crab bearer, vertically align with advance timbering in lower crossheading place is provided with one group of face end support;
Described one group of face end support comprises the two frame end head brackets that are arranged side by side, and wherein the face end support away from work plane is provided with four rear columns, four central posts, two front columns, and the face end support of close work plane is provided with four rear columns, four central posts;
The length of described work plane greater than 200 meters, inclination angle greater than 50 °, coal seam thickness greater than 1.8 meters, the supporting height of described support greater than 1.8 meters, working resistance greater than 7000KN;
Be connected with tilting prevention device between the back timber of adjacent two supports;
Be connected with respectively the accent rack device between the front-end and back-end of the base of adjacent two supports;
Be connected with the oblique pull tilting prevention device between the back timber of lower side stand and the base of upper side stand;
Be connected with respectively front slide shoe and rear slide shoe between the front-end and back-end of the base of support and front slide and the rear slide;
One side of the base of crab bearer and face end support is respectively equipped with assistant pushing mechanism;
The both sides, sidewalk are provided with foot rest between rigidity handrail and frame in the support frame;
Be provided with flexible protective screening between the front column of support.
Described rigidity handrail is L-type, and material is stainless steel, and it is stifled that two ends are provided with rubber, and the L end is fixed on the column of the both sides of walkway in the support towards the downside on inclined plane.
Specific embodiment:
One, work plane corollary equipment as shown in Figure 1, comprising:
Coal-winning machine: MG450/1020-WD;
Front and back scrapper conveyor: SGZ960/1400 drag conveyor;
Elevating conveyor: SZZ1000/400;
Crushing engine: PLM3000;
Conveyor self-movable foot end: DY1200;
Loader Shift: MY800;
Intermediate support: ZF8600/18/35D caving roof coal hydraulic support (extension product ZF10000/18/35D);
Transition bracket: ZFG8600/18/35D transitional hydraulic bracket (extension product ZFG10000/18/35D);
Crab bearer: ZFP8800/20/36D file leader's hydraulic support (extension product ZFG11000/18/35D);
2 of face end support: ZT20000/21/38(1 groups);
The advance timbering of upper and lower crossheading: ZT8670/23/35 type excavation support.
Two, equipment application site:
Peaceful coal group of Shenhua Zao Quan colliery (colliery, extension product Shenhua peaceful coal group Yang Chang gulf);
Geological conditions: coal seam average thickness 3.8m, 51 ° of mean obliquities, 55 ° of inclination maximums, return airway are special-shaped tunnel;
Face length: 255 meters;
Work plane strike length: 1200 meters;
Output: 3,500,000 ton/years.
Three, work plane is arranged and characteristics:
1, work plane and up and down crossheading full protection;
2, the large Mating parameters of heavy support;
3, termination, special-shaped tunnel and advance support;
4, the high inclination-angle longwell is combined and is put automatic control work plane.
Four, advance:
1, the coal wall of 255 meters of face lengths of work.
2, the corollary equipment parameter is large, working resistance is large, surpasses 6500KN.Working resistance is larger, and the weight of support is larger, and sliding force is larger, and the suffered bending power of equipment is larger, and the design of equipment and anti-skid difficulty are larger.
3, adapt to more than 50 degree of work plane inclination angle.
4, work plane, crossheading full protection comprise centre, transition, file leader, termination and advance timbering, and the tunnel is special-shaped tunnel.
5, adopt electric hydraulic control automatically to control.
6, the work plane daily output reaches more than 10000 tons, is the present domestic and international maximum output of large inclination working surface.
Four, take measures:
1, a complete set of anti-skid device: the accent rack device before and after the tilting prevention device that adjacent back timber links to each other, base, the oblique pull tilting prevention device, front and back slip to get shoe, transfer device at the bottom of the two guide rods of two jack;
2, head arranges stable anchor station.The high stability of crab bearer and face end support is the basis of full face and relies on;
3, advanced effectively lateral thruster.The width of side guard board is not less than 600mm, and side guard board adds reinforcing rib, heightens the rigidity of side guard board, and lateral thruster is the separately controllable form of bilateral, and lateral thruster installs the double hydraulic control reversible lock additional, can guarantee support about support power;
4, π shaped steel beam seat is set on the back timber, the usefulness of steady when emergent.
5, safeguard procedures:
1) the front stretchable waste rock stopping screen of frame is set between the front column;
2) per ten machine for casing-in or applying cover to book roads keep off gear cash device between cash device and frame;
3) the rigidity waste rock board is set before the frame;
4) as required, between machine road and frame the roller shutter type protective screening can be installed at any time;
6, assistant pushing mechanism:
1) crab bearer arranges assistant pushing mechanism;
2) face end support arranges assistant pushing mechanism;
7, hommization mechanism:
1) both sides, sidewalk arrange the rigidity handrail in the frame;
2) foot rest between frame is set between frame;
Five, specific constructive form:
1, the total assembling structure of support:
Intermediate support, as shown in Figure 2, design parameter such as following table:
Crab bearer, as shown in Figure 3, design parameter such as following table:
Face end support, shown in Fig. 4 a, 4b, 4c,
Design parameter such as following table:
Advance timbering, shown in Fig. 5 a, 5b, design parameter can be selected according to actual needs.
2, anti-skid device:
The tilting prevention device that adjacent back timber links to each other, as shown in Figure 6, with the back timber connection of adjacent stent;
The accent rack device that base is forward and backward as shown in Figure 7, is located at respectively the front-end and back-end of bracket base;
The oblique pull tilting prevention device as shown in Figure 8, is connected between the base of the back timber of lower side stand and upper side stand;
The shoe of forward and backward slide as shown in Figure 9, is connected between the front and back ends and forward and backward slide of support;
3, transfer device at the bottom of the two guide rods of two jack, as shown in figure 10.
4, assistant pushing mechanism:
1) crab bearer arranges assistant pushing mechanism, as shown in figure 10.
2) face end support arranges assistant pushing mechanism, as shown in figure 11.
5, be provided with flexible protective screening between front column, as shown in figure 12.
6, the both sides, sidewalk arrange foot rest between rigidity handrail and frame in the frame, as shown in figure 13:
Handrail is L-type, and material is stainless steel, and it is stifled that beam-ends is provided with rubber, and L lateral incline downside is so that the pedestrian holds climbing.Handrail is fixed in the both sides of walkway in the frame: the front side of the rear side of two front columns and two rear columns.Be convenient to the height that the pedestrian helps for being installed on, adopt the mode that plate is increased in welding on the pipe collar, the handrail Connection Block is fixed on the column.
7, the structures such as rigidity gear cash device, high inclination-angle support bilateral activity side guard board, π type anti-fall base.
Six, electrohydraulic control system:
1, electrichydraulic control:
Adopt 20 functions, 20 outlet electric-hydraulic control reversing valves, the electrichydraulic control function comprises: and the front column ascending, descending (2 functions, 2 outlets, 2-DN20); The rear column ascending, descending (2 functions, 2 outlets, 2-DN20); Try to stop people from fighting each other, pushing and sliding (2 functions, 2 the outlet, 2-DN20); Left side backplate jack stretch, contract (2 functions, 2 export, 2-DN10); Right side backplate jack stretch, contract (2 functions, 2 the outlet, 2-DN10); Lift base (1 function, 1 the outlet, 1-DN10); Spraying (1 function, 1 outlet, 1-DN10); The wall supporting jack stretch, contract (2 functions, 2 the outlet, 2-DN10); The extensible canopy jack stretch, contract (2 functions, 2 the outlet, 2-DN10); Front cash jack stretch, contract (2 functions, 2 the outlet, 2-DN10); The side guard board release of upper side (1 function, 1 outlet, 1-DN10); (1 function, 1 exports, 1-DN10) to draw rear slide.
Electric-hydraulic control reversing valve master feed liquor P:DN25; Lead back liquid R:DN32.
2, manually control:
Manually the control function comprises: the beam jack is transferred at the end; Anti-down/anti-skidding jack; The tail boom jack; The plate jack; Walkway side block cash jack (10 one group), machine road waste rock board jack (10 group).
3, major function:
1) SAC type electrohydraulic control system can be finished the automatically controlled exercises function of support requirement.
2) electric-control system and electric-hydraulic control reversing valve can satisfy the separate unit support and " fall, move, rise " and be not more than 8 seconds circulation timei; The interlock of coal-winning machine and support, when trying to stop people from fighting each other in groups, one group on 8 supports, 4 supports are tried to stop people from fighting each other simultaneously, finish " fall, move, a rise " net cycle time and are not more than 12.5 seconds supporting requirement.
3) support can be realized in groups procedure auto-control, comprise in groups automatic moving frame, in groups automatically pushing and sliding, in groups automatically stretch wall supporting, in groups the automatic folding wall supporting, in groups automatically stretch extensible canopy, in groups the automatic folding extensible canopy, in groups automatically draw rear slide, automatically stretch front cash, automatic folding front cash in groups in groups.
4) support can be realized manual, the automatic operation that adjacent frame is automatically controlled, realizes the manual operation of this electromagnetic valve button.
5) be equipped with infrared emitting, receiving system, can realize the associating auto-action with working surface coal mining machine.Have simultaneously the coal-winning machine of reception data signal and realize linkage function.Can timely manual operation carry out in the situation of corresponding actions according to the coal mining operation at side block cash device, support can satisfy and coal-winning machine, scrapper conveyor carry out automatic coal cutting requirement, also can realize in the Triangle Coal zone automatically trying to stop people from fighting each other.
6) stroke of the operating pressure of column, advancing jack, the position of coal machine, direction are monitored, and can show and store above-mentioned information on down-hole electrichydraulic control main frame, can be with transfer of data to the ground maneuvers center and show.
7) support electrohydraulic control system self-information and other fully-mechanized mining equipment (equipment such as coal-winning machine, drag conveyor, reprinting crushing engine, emulsion power pack, speech communication system, the stacked switch) information that need to upload can upload to ground and show in down-hole and aboveground computer by aboveground lower data transmission system, are linked into the mine automated system.
8) electrohydraulic control system be provided with audible alarm, anxious stop, this locking and fault self-diagnosis Presentation Function, and can operate manually easily, can carry out online parameter adjustment and set.
9) support is equipped with automatic spraying system, is independently controlled by electro hydraulic valve, realizes automatically assisting coal miner spray before the frame.
10) possess to cooperate with coal-winning machine and carry out full-automatic two-way, unidirectional, part and cut dark coal cutting function.
11) electric-control system is non-MS master-slave type, after work plane control system and the disconnection of crossheading main control system, still can finish various operating functions and operator scheme setting.
12) possess setting load and automatically keep function, compensation setting load adjustable (being no more than pump pressure); Has the sliding advance of support function.
13) electrohydraulic control system possesses the expanded function that work plane increases, reduces electrichydraulic control behind the support.
14) move frame action request (practical function when one action and auto-action):
(1) post (the front and back column is with falling) falls, the upper side of simultaneously electro hydraulic valve control side guard board unlocking function confession liquid, to the side guard board double hydraulic control reversible lock pressure release of upper side (when the front and back column falls separately, realizing said function), when falling the post function stop, the upper side of electro hydraulic valve control side guard board unlocking function mouth stops feed flow.
(2) try to stop people from fighting each other, the upper side of simultaneously electro hydraulic valve control side guard board unlocking function confession liquid, to the side guard board double hydraulic control reversible lock pressure release of upper side, when trying to stop people from fighting each other function stop, the upper side of electro hydraulic valve control side guard board unlocking function mouth stops feed flow.
(3) setting prop, the upper side of simultaneously electro hydraulic valve control side guard board unlocking function confession liquid is to the side guard board double hydraulic control reversible lock pressure release of upper side (realizing said function when the independent setting prop of front and back column).
(4) stretch side side guard board (first mining face is for facing rib right side side guard board).
The large mining height full protection of heavy type of the present invention high inclination-angle longwell fully mechanized coal face is controlled support apparatus automatically, the automatic control coal wall that can be used for 200～300 meters of high inclination-angles more than 50 °, face length, annual production surpasses 3,000,000 tons, is provided with a complete set of safety device, anti-skid device and hommization job platform.Be a kind of large-inclination-angle coal bed, large parameter heavy type support apparatus that adapts to, adapt to the longwell high-yield and high-efficiency and combine the support apparatus of putting fully-mechanized mining working, comprehensive fully mechanized mining, safety protection technique and the automatic control control technology of putting.
The hydraulic support working resistance 10000kN of specific embodiment, 1.8 meters of minimum altitudes, 3.5 meters of maximum heights, has high stability, high strength, high resistance to torsion, high reliability and permanent protective property energy, be provided with a complete set of support and the anti-skid device of transporter, be provided with separately controllable bilateral activity side guard board, between machine road and frame, be provided with extension type gear cash protector, be provided with rigidity waste rock board and Adjustable device cash net before the frame, the base side is transferred crossbeam at the bottom of being provided with the two guide rods of two jack, be provided with pedestrian's handrail and the staged foot rest of hommization, auxiliary foot pedals etc. can adapt to the comprehensive high-yield and high-efficiency work plane of putting of the large supporting longwall full-mechanized mining technique of the 50 above high inclination-angles of degree.
The above; only for the better specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (2)
1. the large mining height full protection of a heavy type high inclination-angle longwell fully mechanized coal face is controlled support apparatus automatically, comprise many supports, it is characterized in that, the work plane place is provided with many intermediate supports, the both sides of intermediate support are provided with respectively 1 to 2 transition bracket and 2 to 4 crab bearers successively, be respectively equipped with 2 to 4 groups of advance timberings in upper crossheading and the lower crossheading, every group of advance timbering comprises two advance timberings that are arranged side by side, and the position of laterally aliging with crab bearer, vertically align with advance timbering in lower crossheading place is provided with one group of face end support;
Described one group of face end support comprises the two frame end head brackets that are arranged side by side, and wherein the face end support away from work plane is provided with four rear columns, four central posts, two front columns, and the face end support of close work plane is provided with four rear columns, four central posts;
The length of described work plane greater than 200 meters, inclination angle greater than 50 °, coal seam thickness greater than 1.8 meters, the supporting height of described support greater than 1.8 meters, working resistance greater than 7000KN;
Be connected with tilting prevention device between the back timber of adjacent two supports;
Be connected with respectively the accent rack device between the front-end and back-end of the base of adjacent two supports;
Be connected with the oblique pull tilting prevention device between the back timber of lower side stand and the base of upper side stand;
Be connected with respectively front slide shoe and rear slide shoe between the front-end and back-end of the base of support and front slide and the rear slide;
One side of the base of crab bearer and face end support is respectively equipped with assistant pushing mechanism;
The both sides, sidewalk are provided with foot rest between rigidity handrail and frame in the support frame;
Be provided with flexible protective screening between the front column of support.
2. the large mining height full protection of heavy type according to claim 1 high inclination-angle longwell fully mechanized coal face is controlled support apparatus automatically, it is characterized in that, described rigidity handrail is L-type, material is stainless steel, it is stifled that two ends are provided with rubber, the L end is fixed on the column of the both sides of walkway in the support towards the downside on inclined plane.
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| CN201210414764.6A CN102877872B (en) | 2012-10-25 | 2012-10-25 | Heavy large-mining-height full-protection large-dip-angle long-wall fully mechanized caving face automatic control supporting equipment |
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| CN201210414764.6A CN102877872B (en) | 2012-10-25 | 2012-10-25 | Heavy large-mining-height full-protection large-dip-angle long-wall fully mechanized caving face automatic control supporting equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103775084A (en) * | 2014-01-26 | 2014-05-07 | 四川川煤华荣能源股份有限公司花山煤矿 | Construction technology of large-inclined-angle and large-mining-height fully-mechanized coal mining equipment passing through geological-structured fracture zone |
| CN104594932A (en) * | 2014-12-29 | 2015-05-06 | 中国神华能源股份有限公司 | Mining supporting support equipment and mining method thereof |
| CN105065046A (en) * | 2015-07-13 | 2015-11-18 | 辽宁工程技术大学 | Flexible protection device between adjacent hydraulic support frames |
| CN105971648A (en) * | 2015-09-30 | 2016-09-28 | 北京中矿创新联盟能源环境科学研究院 | End support and equipment system of roadway-free and coal-pillar-free self-retained roadway mining method |
| CN106523012A (en) * | 2016-12-08 | 2017-03-22 | 四川航天电液控制有限公司 | Scraper conveyor pushing structure for pitching oblique mining way of fully-mechanized coal mining face of sharp-inclined coal seam |
| CN108167010A (en) * | 2018-03-02 | 2018-06-15 | 中煤北京煤矿机械有限责任公司 | For the handrail of high inclination-angle hydraulic support |
| US10494924B2 (en) | 2015-06-24 | 2019-12-03 | Manchao He | Longwall mine construction method N00 |
| CN112377233A (en) * | 2020-11-10 | 2021-02-19 | 四川川煤华荣能源股份有限公司 | End bracket moving method |
| US11008860B2 (en) | 2015-06-24 | 2021-05-18 | Manchao He | Equipment system for no-roadway no-coal-pillar retained roadway mining method |
| CN114635726A (en) * | 2022-04-01 | 2022-06-17 | 冀中能源峰峰集团有限公司 | Double-staggered arrangement method for upper end of fully mechanized caving face |
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