CN110359908B - Small-sized mechanical coal mining method for flexible shield support of steep coal seam - Google Patents
Small-sized mechanical coal mining method for flexible shield support of steep coal seam Download PDFInfo
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- CN110359908B CN110359908B CN201910513376.5A CN201910513376A CN110359908B CN 110359908 B CN110359908 B CN 110359908B CN 201910513376 A CN201910513376 A CN 201910513376A CN 110359908 B CN110359908 B CN 110359908B
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- 239000003245 coal Substances 0.000 title claims abstract description 292
- 238000005065 mining Methods 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005520 cutting process Methods 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 230000005641 tunneling Effects 0.000 claims abstract description 14
- 239000000178 monomer Substances 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000005422 blasting Methods 0.000 abstract description 5
- 238000003860 storage Methods 0.000 abstract description 4
- 101100008048 Caenorhabditis elegans cut-4 gene Proteins 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C29/00—Propulsion of machines for slitting or completely freeing the mineral from the seam
- E21C29/04—Propulsion of machines for slitting or completely freeing the mineral from the seam by cable or chains
- E21C29/14—Propulsion of machines for slitting or completely freeing the mineral from the seam by cable or chains by haulage cable or chain pulling the machine along the working face
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/08—Advancing mechanisms
- E21D23/10—Advancing mechanisms with advancing devices separate from the supporting construction
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Abstract
The invention provides a small-sized mechanical coal mining method of a flexible shield support of a steep coal seam, which comprises the tunneling of a horizontal transportation gateway, a horizontal return air gateway and an open cut hole of an inclined coal face; installing a plurality of flexible shield support single bodies on the goaf side in the cutting hole of the inclined coal face, connecting and fixing the plurality of flexible shield support single bodies by a plurality of steel wire ropes, and reserving a plurality of steel wire rope heads at two ends of the flexible shield support respectively; an upper traction rope and a lower traction rope which are connected with the head end and the tail end of the coal mining machine are respectively arranged on the coal mining side in the cutting hole of the inclined coal mining working face; the flexible shield support is pulled to move the support, small mechanical mining is carried out on the coal mine with thin coal seam and less coal storage amount without blasting and coal dropping, personnel is not needed to be on the spot during coal mining and support moving, safety and reliability are high, and labor intensity and cost are reduced.
Description
Technical Field
The invention relates to a coal mining method, in particular to a small-sized mechanized mining method for a steeply inclined coal seam, and belongs to the technical field of coal mining.
Background
For the exploitation of a steep coal seam, the prior art includes: the method comprises a flexible shield support coal mining method, a pseudo-inclined-strike long-wall subsection dense coal mining method, a suspended support top coal caving coal mining method, a steeply inclined coal seam comprehensive mechanized coal mining method and the like, wherein the pseudo-inclined-strike long-wall flexible shield support coal mining method is a method for blasting coal mining by arranging a flexible shield support in a strike long-wall roadway, and the coal caving process of the coal mining method is blasting coal caving, has greater safety risk and is a coal mining process which tends to be eliminated. Other methods have the defects of large equipment investment, difficult installation and moving of a coal face and the like, and have the problems of mutual 'frame biting' and frame reversing and the like when a fully mechanized support moves, particularly the existing coal mining method is difficult to mine coal mines with thin coal seams and small coal storage amount, so that the coal resources cannot be utilized. Therefore, there is a need for improvements in the prior art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention changes the coal falling process on the basis of the coal mining method of the pseudo-inclined walking long-wall flexible shield support, does not need blasting to fall coal, and combines the flexible shield support with a common small-sized coal mining machine to realize safe and reliable coal mining with low labor intensity and low cost in coal mines with thin coal seams and less coal storage amount. The invention provides a small-sized mechanical coal mining method of a flexible shield support of a steep coal seam.
The invention is completed by the following technical scheme: a small-sized mechanized coal mining method of a flexible shield support of a steep seam is characterized by comprising the following steps:
1) tunneling a horizontal transportation crossheading from outside to inside below the steep coal mining area until the coal mining end at the boundary of the coal mining area, and installing a coal transportation conveyor in the tunneling horizontal transportation crossheading; tunneling a horizontal return air crossheading from outside to inside above the horizontal transportation crossheading until the horizontal return air crossheading is positioned at the boundary of a coal mining area; tunneling an inclined coal face open-off cut so that the inclined coal face open-off cut is communicated with a lower horizontal transportation gateway and an upper horizontal return air gateway;
2) sequentially mounting a plurality of flexible shield support monomers on the goaf side in the cutting hole of the inclined coal face in the step 1), connecting and fixing the plurality of flexible shield support monomers by a plurality of steel wire ropes to form an integral flexible shield support for separating and blocking goaf waste rocks and keeping a coal mining space smooth, and reserving a plurality of steel wire rope heads at two ends of the integral flexible shield support respectively;
3) arranging an upper traction rope and a lower traction rope at the coal mining side in the cutting hole of the inclined coal mining working face in the step 1), wherein one ends of the upper traction rope and the lower traction rope are respectively fixed at the head end and the tail end of a rack of a coal mining machine, the other end of the upper traction rope penetrates through positioning pulleys fixed in a horizontal air return crossheading at intervals and is connected with an external winch after extending outwards, and the other end of the lower traction rope penetrates through the positioning pulleys fixed in the horizontal transportation crossheading at intervals and is connected with the external winch after extending outwards;
4) under the actions of tightening the upper traction rope and loosening the lower traction rope, the coal mining machine is pulled to cut coal from the coal mining end of the horizontal transportation gate at the lower part along the cutting hole of the inclined coal mining working face from bottom to top in an inclined manner, the cut coal automatically slides onto the coal conveying conveyor and is conveyed out of a coal mining area along with the coal conveying conveyor, and coal is mined until the horizontal return air gate at the upper part is stopped, so that primary coal cutting is finished;
5) after primary coal cutting is finished, the coal mining machine is dismounted from the traction ropes, the rope heads of a plurality of steel wire ropes reserved at the two ends of the flexible shield support are connected with the rope heads of the corresponding upper traction ropes and the lower traction ropes, and the flexible shield support is moved outwards along with the coal mining working face under the common tightening action of the upper traction ropes and the lower traction ropes;
6) after moving the frame, detaching the traction ropes from two ends of the flexible shield support, connecting the coal mining machine, under the tightening action of the lower traction rope and the loosening action of the upper traction rope, drawing the coal mining machine to return to the coal mining end of the horizontal transportation crossheading from top to bottom along the cut hole of the inclined coal mining working face, then drawing the coal mining machine from the coal mining end of the horizontal transportation crossheading at the lower part under the tightening action of the upper traction rope and the loosening action of the lower traction rope, mining coal from bottom to top along the inclined coal mining working face in an inclined manner, automatically sliding the mined coal to the coal conveying conveyor, conveying the coal to a coal mining area along the coal conveying conveyor, and mining the coal to the horizontal return air crossheading at the upper part to finish;
7) repeating the steps 4), 5) and 6) to enable the coal face to continuously push outwards until all the coal in the coal mining area is mined;
8) and repeating the steps 1) -7) to perform coal mining of the next steep coal mining area.
The coal cutter runs close to the bottom during the first mining, the coal cutting thickness is 0.2-0.4m, the 'cut' coal mining is completed, the upper coal automatically falls down after the original stress of the primary coal seam is damaged by the 'cut', if the coal seam is not easy to fall down, the coal cutting position of the coal cutter is adjusted by adjusting the position of the traction rope, the coal cutting is completed from bottom to top again, and different mining heights are completed by cutting coal with an indefinite number.
The coal conveying conveyor is a conventional scraper conveyor and is used for conveying fallen coal out of the coal mining area through the horizontal conveying gate way.
The coal cutter is conventional equipment and comprises a rack shell, a power machine arranged in the rack shell and a coal cutting chain saw driven by the power machine, wherein the rack is arranged in the inclined cutting hole, and the coal cutting chain saw is arranged below a coal wall, so that the coal cutting chain saw can rotate to break and saw coal under the driving of the power machine.
The coal cutting position of the coal mining machine is adjusted by adjusting the position of the positioning traction rope, wherein the coal cutting position of the coal mining machine is the position of the coal mining machine on the thickness of a coal seam.
The winch is a conventional prop pulling winch and is provided with two winches which are respectively connected with an upper traction rope and a lower traction rope and used for driving the traction ropes to tighten and loosen, the coal mining machine is pulled by the traction ropes to complete coal mining during coal mining, and the flexible shield support is integrally moved after the traction ropes are connected with a plurality of wire rope ends reserved at two ends of the corresponding flexible shield support during support moving. The winch is placed in an underground roadway with fresh air flow.
The flexible shield support is a conventional device, at least three steel wire ropes for fixing a plurality of flexible shield support monomers are arranged, rope ends reserved at two ends of each steel wire rope are made into connecting buckles, the connecting buckles are connected with connecting buckles on the traction ropes through horseshoe rings, and the traction ropes are driven by a winch to move the support.
A plurality of positioning pulleys are arranged in the horizontal air return crossheading and the horizontal transportation crossheading and are used for tensioning the traction rope and controlling the position of the traction rope, so that the traction requirements of different coal mining areas are met.
Compared with the prior art, the invention has the following advantages and effects: by adopting the technical scheme, the coal mining machine and the flexible shield support in the prior art can be conveniently used for tunneling an upper return air crossheading, a lower transportation crossheading and an inclined open-off cut hole in a steep coal seam, and the invention is added with: a steel wire rope hauled shearer and a hauled flexible shield support moving frame. The small mechanical mining can be realized in coal mines with thin coal seams and small coal storage amount, coal automatically slides out of a coal face, blasting and coal dropping and coal conveying equipment are not needed on the coal face, and meanwhile, the coal and waste rock separation and the smooth ventilation space of the coal face are ensured, so that no people exist during coal mining of the coal face. Therefore, the coal mining method has extremely high safety and reliability, greatly reduces the labor intensity and the cost, provides reliable technical support for realizing mechanized safe mining for steep coal seams, especially thin coal seams which are not suitable for large-scale mechanized coal mining, and develops and utilizes more coal resources.
Drawings
FIG. 1 is a plan view of a coal face layout of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a sectional view taken along line A-A of FIG. 1;
fig. 4 is a schematic view of the connection between the rope end of the steel wire rope and the traction rope.
In the figure, 1 is an upper haulage rope, 2 is a horizontal return air crossheading, 3 is a haulage rope positioning pulley, 4 is an inclined coal face open cut hole, 5 is a flexible shield support, 6 is a steel wire rope for connecting and fixing the flexible shield support, 61 is a connecting buckle of a steel wire rope head, 7 is a coal mining machine, 71 is a coal cutting chain saw of the coal mining machine, 8 is a scraper conveyer, 9 is a pedestrian eye, 10 is a horizontal transportation crossheading, 11 is a lower haulage rope, 111 is a connecting buckle of the haulage rope head, and 12 is a horseshoe ring.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
Examples
A small-sized mechanized coal mining method of a flexible shield support of a steep seam comprises the following steps:
1) tunneling a horizontal transportation crossheading 10 from outside to inside below the steep coal mining area until the coal mining end is positioned at the boundary of the coal mining area, and installing a scraper conveyor 8 in the tunneling horizontal transportation crossheading 10; tunneling the horizontal return air gateway 2 from outside to inside above the horizontal transportation gateway 10 until the horizontal return air gateway is positioned at the boundary of the coal mining area; tunneling an inclined coal face open-off cut 4, so that the inclined coal face open-off cut 4 is communicated with a lower transportation gateway 10 and an upper return air gateway 2;
2) sequentially mounting a plurality of flexible shield support 5 monomers on the goaf side in the inclined coal face cutting hole 4 in the step 1), connecting and fixing the plurality of flexible shield support 5 monomers by four steel wire ropes 6 to form an integral flexible shield support 5 for separating and blocking goaf waste rocks and keeping a coal mining space smooth, and reserving rope heads of the four steel wire ropes 6 at two ends of the integral flexible shield support 5 respectively;
3) an upper traction rope 1 and a lower traction rope 11 are respectively arranged at the coal mining side in the inclined coal mining face open-off hole 4 in the step 1), the inner ends of the upper traction rope 1 and the lower traction rope 11 are respectively fixed at the head end and the tail end of a rack of a coal mining machine 7, the outer end of the upper traction rope 1 penetrates through a positioning pulley 3 fixed in a horizontal air return crossheading 2 at intervals, and is connected with a first winch outside after extending outwards, the outer end of the lower traction rope 11 penetrates through the positioning pulley 3 fixed in a horizontal transportation crossheading 10 at intervals, and is connected with a second winch outside after extending outwards; the first winch and the second winch are arranged in an underground roadway with fresh air flow;
4) under the actions of tightening the upper traction rope 1 and loosening the lower traction rope 11, the coal mining machine 7 is pulled to obliquely cut coal from the coal mining end of the horizontal transportation crossheading 10 at the lower part along the cutting hole 4 on the inclined coal mining working face from bottom to top, the cut coal automatically slides onto the scraper conveyor 8 and is sent out of a coal mining area along with the scraper conveyor 8, and the coal is mined until the upper horizontal return air crossheading 2 is reached, so that the primary coal cutting is finished;
5) after primary coal cutting is finished, the coal mining machine 7 is detached from the inner ends of the upper and lower hauling ropes 1 and 11, four rope heads of a steel wire rope 6 reserved at two ends of the flexible shield support 5 are connected with the inner ends of the corresponding upper and lower hauling ropes 1 and 11, and the flexible shield support 5 is moved outwards along with the coal mining working face under the common tightening action of the upper and lower hauling ropes 1 and 11;
6) after the frame is moved to the proper position, four wire rope 6 rope heads at two ends of a flexible shield support 5 are detached from the inner ends of an upper traction rope 1 and a lower traction rope 11, an upper coal mining machine 7 is connected, under the tightening action of the lower traction rope 11 and the loosening action of the upper traction rope 1, the upper coal mining machine 7 is pulled to return to the coal mining end of a horizontal transportation crossheading 10 from top to bottom along an open cutting hole 4 of an inclined coal mining working face, then under the tightening action of the upper traction rope 1 and the loosening action of the lower traction rope 11, the upper coal mining machine 7 is pulled to start from the coal mining end of the horizontal transportation crossheading 10 at the lower part and obliquely mine coal from bottom to top along the open cutting hole 4 of the inclined coal mining working face, the mined coal automatically slides down to a scraper conveyor 8 and is sent out of a coal mining area along the scraper conveyor 8 to;
7) repeating the steps 4), 5) and 6) to continuously push the coal face outwards, and moving the flexible shield support 5 outwards while synchronously pushing the flexible shield support outwards along with the coal face till all coal in the coal mining area is mined;
8) and repeating the steps 1) -7) to perform coal mining of the next steep coal mining area.
The coal cutter 7 is conventional equipment and comprises a frame shell, a power machine arranged in the frame shell and a coal cutting chain saw 71 driven by the power machine, wherein the frame is arranged in the inclined cutting hole 4, and the coal cutting chain saw 71 is arranged below a coal wall, so that the coal cutting chain saw 71 can rotate under the driving of the power machine to break and saw coal.
A plurality of positioning pulleys 3 are arranged in the horizontal air return crossheading 2 and the horizontal transportation crossheading 10 and are used for tensioning the traction ropes 1 and 11 and controlling the positions of the traction ropes 1 and 11, so that the traction requirements of different coal mining areas are met.
The flexible shield support 5 is a conventional device, four steel wire ropes 6 for fixing a plurality of flexible shield supports 5 are arranged, rope ends reserved at two ends of each steel wire rope 6 are made into connecting buckles 61, the connecting buckles 61 are connected with connecting buckles 111 at the inner ends of the upper or lower hauling ropes 1 and 11 through horseshoe rings 12, and the winch drives the upper and lower hauling ropes 1 and 11 to move the flexible shield supports 5.
In the embodiment, the pseudo inclination angle of the coal face is more than 40 degrees, the mined coal automatically slides to the scraper conveyor 8 of the horizontal transportation crossheading 10 below the coal face, the length of the cut hole 4 of the inclined coal face is 100 m, the thickness of the mined coal layer is 0.8m, the thickness of one-time coal cutting is 0.3 m, and after one-time coal cutting, the coal completely automatically falls without multiple position adjustment. A goaf is arranged above the whole coal mining area, the upper section of the flexible shield support 5 automatically moves under the action of gravity of gangue without using a traction rope for dragging, and the lower section of the flexible shield support 5 automatically moves after using the traction rope for dragging. The coal mining machine used in coal mining has small volume and is convenient to mount and dismount. The traction winch adopts a prop drawing winch.
The embodiment realizes better coal mining and frame moving effects. The present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The small-sized mechanical coal mining method of the flexible shield support of the steeply inclined coal seam absorbs the advantages of the flexible shield support coal mining method, and realizes the self-sliding of coal on the coal face by utilizing the characteristic of large inclination angle of the steeply inclined coal seam. The winch drives the haulage rope to pull the coal mining machine to complete coal cutting and support moving, the concept is ingenious, no person is left when the coal face is mined, and the coal mining process of the steep coal seam is advanced to no person.
The coal mining method has the characteristics of small top control area, large circulation progress, high unit yield of a working face and low mining cost, and has good practical popularization value in mining of steeply inclined thin coal seams.
By the small-sized mechanical coal mining method of the flexible shield support of the steeply inclined coal seam, small-sized mechanical mining of the steeply inclined coal seam under the flexible shield support can be realized, unmanned operation during coal mining of a coal face is realized, remote control of personnel is realized, coal mining safety risks of coal mine workers are reduced, labor intensity is reduced, investment and production cost is reduced, and economic benefits are improved.
Claims (6)
1. A small-sized mechanized coal mining method of a flexible shield support of a steep seam is characterized by comprising the following steps:
1) tunneling a horizontal transportation crossheading from outside to inside below the steep coal mining area until the coal mining end at the boundary of the coal mining area, and installing a coal transportation conveyor in the tunneling horizontal transportation crossheading; tunneling a horizontal return air crossheading from outside to inside above the horizontal transportation crossheading until the horizontal return air crossheading is positioned at the boundary of a coal mining area; tunneling an inclined coal face open-off cut so that the inclined coal face open-off cut is communicated with a lower horizontal transportation gateway and an upper horizontal return air gateway;
2) sequentially mounting a plurality of flexible shield support monomers on the goaf side in the cutting hole of the inclined coal face in the step 1), connecting and fixing the plurality of flexible shield support monomers by a plurality of steel wire ropes to form an integral flexible shield support for separating and blocking goaf waste rocks and keeping a coal mining space smooth, and reserving a plurality of steel wire rope heads at two ends of the integral flexible shield support respectively;
3) arranging an upper traction rope and a lower traction rope at the coal mining side in the cutting hole of the inclined coal mining working face in the step 1), wherein the inner ends of the upper traction rope and the lower traction rope are respectively fixed at the head end and the tail end of a rack of a coal mining machine, the outer end of the upper traction rope penetrates through positioning pulleys fixed in a horizontal return air crossheading at intervals and is connected with an external winch after extending outwards, and the outer end of the lower traction rope penetrates through the positioning pulleys fixed in the horizontal transportation crossheading at intervals and is connected with the external winch after extending outwards;
4) under the actions of tightening the upper traction rope and loosening the lower traction rope, the coal mining machine is pulled to cut coal from the coal mining end of the horizontal transportation gate at the lower part along the cutting hole of the inclined coal mining working face from bottom to top in an inclined manner, the cut coal automatically slides onto the coal conveying conveyor and is conveyed out of a coal mining area along with the coal conveying conveyor, and coal is mined until the horizontal return air gate at the upper part is stopped, so that primary coal cutting is finished;
5) after primary coal cutting is finished, the coal mining machine is dismounted from the traction ropes, the rope heads of a plurality of steel wire ropes reserved at the two ends of the flexible shield support are connected with the rope heads of the corresponding upper traction ropes and the lower traction ropes, and the flexible shield support is moved outwards along with the coal mining working face under the common tightening action of the upper traction ropes and the lower traction ropes;
6) after moving the frame, detaching the traction ropes from two ends of the flexible shield support, connecting the coal mining machine, under the tightening action of the lower traction rope and the loosening action of the upper traction rope, drawing the coal mining machine to return to the coal mining end of the horizontal transportation crossheading from top to bottom along the cut hole of the inclined coal mining working face, then drawing the coal mining machine from the coal mining end of the horizontal transportation crossheading at the lower part under the tightening action of the upper traction rope and the loosening action of the lower traction rope, mining coal from bottom to top along the inclined coal mining working face in an inclined manner, automatically sliding the mined coal to the coal conveying conveyor, conveying the coal to a coal mining area along the coal conveying conveyor, and mining the coal to the horizontal return air crossheading at the upper part to finish;
7) repeating the steps 4), 5) and 6) to enable the coal face to continuously push outwards until all the coal in the coal mining area is mined;
8) and repeating the steps 1) -7) to perform coal mining of the next steep coal mining area.
2. The small-scale mechanized coal mining method of the flexible shield support of the steeply inclined coal seam according to claim 1, wherein the coal conveyor is a conventional scraper conveyor for conveying fallen coal out of the coal mining area through a horizontal transportation gate.
3. The small-scale mechanized coal mining method of the flexible shield support of the steeply inclined coal seam according to claim 1, wherein the coal mining machine is a conventional device and comprises a housing, a power machine arranged in the housing, and a coal cutting chain saw driven by the power machine, the housing is arranged in the inclined cutting hole, the coal cutting chain saw is arranged below the coal wall, and the coal cutting chain saw is driven by the power machine to rotate to break and saw coal.
4. The small-scale mechanized coal mining method of the flexible shield support of the steeply inclined coal seam according to claim 1, wherein the winch is a conventional prop pulling winch, two winches are provided and are respectively connected with the upper and lower hauling ropes for driving the hauling ropes to tighten and loosen, the coal mining machine is hauled by the hauling ropes during coal mining to complete coal mining, and the flexible shield support is moved integrally after being connected with a plurality of wire rope heads reserved at two ends of the corresponding flexible shield support through the hauling ropes during moving.
5. The small-scale mechanized coal mining method of the flexible shield support of the steeply inclined coal seam according to claim 1, characterized in that the flexible shield support is a conventional device, at least three steel wire ropes for fixing a plurality of flexible shield support monomers are provided, rope heads reserved at two ends of each steel wire rope are made into connecting buckles, and the connecting buckles are connected with the connecting buckles on the hauling rope through horseshoe rings.
6. The small-sized mechanized coal mining method of the flexible shield support of the steeply inclined coal seam according to claim 1, wherein a plurality of positioning pulleys are arranged in the horizontal air return crossheading and the horizontal transportation crossheading, and are used for tensioning a traction rope and controlling the position of the traction rope to meet the traction requirements of different coal mining areas.
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| CN111828072A (en) * | 2020-07-23 | 2020-10-27 | 四川川煤石洞沟煤业有限责任公司 | Arched flexible shield support and system for gob-side entry retaining of coal mine |
| CN112682040A (en) * | 2020-12-29 | 2021-04-20 | 四川川煤石洞沟煤业有限责任公司 | Mining method for large-dip-angle coal seam flexible shield support falling frame arrangement zero coal pillar |
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| CN101245710A (en) * | 2007-09-12 | 2008-08-20 | 中国矿业大学(北京) | Vertical shaft bucket conveyer and its unmanned work face coal mining method |
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