CN110578523A - Method and system for mining top coal of medium-thickness coal seam with extra-large dip angle - Google Patents
Method and system for mining top coal of medium-thickness coal seam with extra-large dip angle Download PDFInfo
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- CN110578523A CN110578523A CN201910981889.9A CN201910981889A CN110578523A CN 110578523 A CN110578523 A CN 110578523A CN 201910981889 A CN201910981889 A CN 201910981889A CN 110578523 A CN110578523 A CN 110578523A
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- 239000003245 coal Substances 0.000 title claims abstract description 223
- 238000005065 mining Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000004891 communication Methods 0.000 claims abstract description 6
- 238000011084 recovery Methods 0.000 claims description 24
- 239000011435 rock Substances 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 4
- 230000003028 elevating effect Effects 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 7
- 238000009423 ventilation Methods 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 244000048199 Hibiscus mutabilis Species 0.000 description 1
- 235000003973 Hibiscus mutabilis Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
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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
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
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- Excavating Of Shafts Or Tunnels (AREA)
Abstract
the invention provides a method and a system for mining caving coal of a medium-thickness coal seam with an extra-large dip angle. A vertical and horizontal U-shaped ventilation system is formed by communicating a process communication roadway with an upper air return roadway and a lower air inlet transportation roadway, so that timely ventilation is ensured in the coal mining process, a large-angle pseudo-inclined long arm mining mode of a medium-thickness coal seam with an extra-large inclination angle is changed into a vertical caving and caving coal mining mode through development arrangement of the roadway and installation work of mining equipment, coal between the upper air return roadway and the lower air inlet transportation roadway can be effectively mined, mechanized mining of the medium-thickness coal seam with the extra-large inclination angle is realized, the safety problem of mechanized mining with the extra-large inclination angle is effectively solved, the mining efficiency is high, and the mining equipment is stable and easy to install.
Description
Technical Field
The invention belongs to the technical field of mining engineering, and particularly relates to a method and a system for mining a medium-thickness coal seam with an extra-large dip angle by caving.
Background
the occurrence conditions for mining the steep coal seam are always the focus of attention of the industry at present. Because the mechanized mining of the steeply inclined coal seam is difficult, blasting mining or abandoned mining is usually adopted for mining of the steeply inclined coal seam, so that a large amount of resources are wasted, or the production efficiency is low, and safety accidents are frequent. Therefore, under the condition of a steep coal seam, how to safely and effectively mine coal resources is one of the problems to be solved in the coal industry.
The evolution of the mining method of the domestic steep coal seam can be summarized into the following five stages:
The first stage of development: in 1950, the first-line technical researchers in China adopt different methods according to different geological conditions, wherein the different methods comprise step reversing, horizontal layering, longwall and dip down, pneumatic pick coal dropping and the like.
And (3) a second development stage: in the beginning of sixty years, the steeply inclined coal seam is mainly drilled and blasted by an electric drill to drop coal, and a first air pick coal dropping mode is replaced. In order to enlarge the application range of the shield support, the shield support in the shape of Chinese character ' ba ', 7 ', etc. is applied in the mine areas of Huainan province, etc. Compared with a flat shield support, the shield support has good economic benefit. Meanwhile, the metal pillars and the metal hinged top beams are gradually adopted, the extraction process of the steeply inclined working face is improved, and a better technical and economic effect is achieved.
The third stage of development: in the middle of seventies, a pseudo-inclined flexible shield support coal mining method is mainly used, and a Huainan mining area is a typical case. The method has the advantages of good yield, simple process, small tunneling amount, safety, high efficiency and the like, and the mining area is still used at present. In order to improve the degree of mechanization under such conditions, the mining areas such as the henwest, the Panzhihua, the Huainan and the like have tested shearers, impact plows and ditches. In addition, similar tests are also carried out in other mining areas, but the success rate is not high, and the method cannot be popularized in a large area.
The fourth stage of development: in the late 80 s and early 90 s, the mining method of the steeply inclined coal seam is further improved. The length of the working surface, the increase of the unit production and the safe production conditions are further improved. For example, the successful diving, inclining and long-wall horizontal subsection coal mining method in the inspection field coal mine test of the Sichuan Hibiscus mutabilis bureau is a short-wall coal mining method and has the characteristics of large production capacity, good ventilation condition, convenient roof management and the like.
The fifth development stage: in the middle of the 90 s, the comprehensive mechanized mining popularization stage of the steeply inclined medium-thick, thick and extra-thick coal seam is reached.
In the last thirty years, seven methods for mining steeply inclined coal seams, such as medium-thickness coal seams, thick coal seams and extra-thick coal seams, are basically formed, and comprise the following steps: fully mechanized top coal caving in horizontal layering; roadway pillar-horizontal layered fully mechanized top coal caving; the dip angle trend is changed by inclining and layering, and the top coal is fully mined by long walls; fully mechanized top coal caving is arranged in a manner of inclined strike long wall variable line arrangement; the top coal is fully mechanized and caving in long wall in inclined layered trend; the inclined trend long wall pseudo-inclined arrangement fully mechanized mining once adopts the full height; a roadway column type fully mechanized top coal caving coal mining method. The methods still do not effectively solve the problem of mechanized mining of coal seams with the coal seam thickness of 1-5 meters and the coal seam incidence angle of 45-90 degrees, the traditional blasting mining process of the flexible shield support is still used, as shown in figures 1 and 2, the method has great technical safety problems, and the state proposes to close the mines for many times.
As shown in fig. 1 and 2, the working face of the pseudo-inclined long arm of the traditional flexible shield support is arranged into a coal seam 104, a rock stratum 102, a broken rock stratum 101, an upper air return roadway 105, a support 103 and a lower air inlet transportation roadway 106, the inclination angle of the coal seam is in the range of 45-90 degrees, and due to the fact that the inclination angle is too large, the anti-falling and anti-skidding of fully mechanized mining equipment cannot be set, the personnel is not easy to construct and manage, the potential safety hazard is large, and the mechanized mining is difficult to realize.
disclosure of Invention
In order to solve the technical problem, the invention provides a method and a system for mining the caving coal of a medium-thickness coal bed with an extra-large dip angle. The invention adopts the following technical scheme:
in some alternative embodiments, there is provided a method of mining a top coal from a medium thickness coal seam with an oversize dip angle, comprising: drilling a lower air inlet transportation roadway in a coal seam, wherein the tail end of the lower air inlet transportation roadway serves as a coal breakage working face, and an upper air return roadway is drilled at the upper part of the coal breakage working face; drilling a process connecting roadway on a rock stratum on the side face of the coal seam, wherein the process connecting roadway is respectively communicated with the upper air return roadway and the lower air inlet transportation roadway; installing mining equipment in the lower air inlet transportation roadway; the local main fan arranged in the upper return air roadway works to enable air to enter along the lower air inlet transportation roadway, flow into the upper return air roadway through the process connection roadway and be discharged; the caving rock mass pushes the loose coal at the lower part to flow downwards, the coal discharging spile on the coal return rear hydraulic support in the mining equipment does telescopic action, so that the flowing-down coal falls into the reversed loader in the mining equipment, and when the coal stops flowing, the coal discharging tail beam on the coal return rear hydraulic support swings to loosen the coal to enable the coal to flow.
in some optional embodiments, the method for mining the caving coal of the medium and thick coal seam with the extra-large dip angle further comprises the following steps: and a plurality of safety control holes communicated to the coal bed or the rock stratum are arranged in the process communication roadway.
In some optional embodiments, the process of installing mining equipment in the lower intake air haulage roadway includes: and overlapping the machine head of the reversed loader on a reversed loader pulley of the mining equipment, installing the reversed loader pulley on a track in the mining equipment, and paving a belt conveyor parallel to the track in the mining equipment in the lower air inlet transportation roadway.
In some alternative embodiments, the present invention also provides a top coal caving system for a medium thickness coal seam with an extra large dip angle, comprising: the mining equipment is arranged in the lower air inlet transportation roadway; the mining apparatus includes: the coal recovery device comprises a coal recovery front hydraulic support, a coal recovery rear hydraulic support and a reversed loader, wherein the end part of the reversed loader is arranged in the coal recovery front hydraulic support and the coal recovery rear hydraulic support, a swing oil cylinder and a coal discharge tail beam are arranged on the coal recovery rear hydraulic support, and the action end of the swing oil cylinder is connected with the coal discharge tail beam, so that the coal discharge tail beam is driven to swing on the coal recovery rear hydraulic support when the swing oil cylinder does telescopic motion; the coal caving tail beam is provided with a telescopic oil cylinder and a coal caving inserting plate, and the action end of the telescopic oil cylinder is connected with the coal caving inserting plate, so that the coal caving inserting plate is driven to move on the coal caving tail beam in a reciprocating manner when the telescopic oil cylinder acts; further comprising: the local main fan is arranged in the upper return air roadway.
In some optional embodiments, the mining apparatus further comprises: a transfer pulley, a track and a belt conveyor; the elevating conveyor is characterized in that one end of the reversed loader is arranged in the hydraulic support before coal returning and the hydraulic support after coal returning, the other end of the reversed loader is hinged to the reversed loader pulley, the reversed loader pulley is arranged on the track, and the belt conveyor is parallel to the track and laid in the lower air inlet transportation roadway.
The invention has the following beneficial effects: a vertical and horizontal U-shaped ventilation system is formed by communicating a process communication roadway with an upper air return roadway and a lower air inlet transportation roadway, so that timely ventilation is ensured in the coal mining process, a large-angle pseudo-inclined long arm mining mode of a medium-thickness coal seam with an extra-large inclination angle is changed into a vertical caving and caving coal mining mode through development arrangement of the roadway and installation work of mining equipment, coal between the upper air return roadway and the lower air inlet transportation roadway can be effectively mined, mechanized mining of the medium-thickness coal seam with the extra-large inclination angle is realized, the safety problem of mechanized mining with the extra-large inclination angle is effectively solved, the mining efficiency is high, and the mining equipment is stable and easy to install.
drawings
FIG. 1 is a schematic view of a pseudo-diagonal long arm face layout of a conventional flexible shield support;
FIG. 2 is a schematic cross-sectional view of a coal face support of a conventional flexible shield support;
FIG. 3 is a schematic view of the spatial arrangement of the roadways of the present invention;
FIG. 4 is a schematic plan view of a roadway according to the present invention;
FIG. 5 is a schematic layout of a hydraulic support before coal recovery and a hydraulic support after coal recovery according to the present invention;
FIG. 6 is a schematic illustration of a mining equipment installation arrangement of the present invention;
FIG. 7 is a schematic view of a reversed loader mounting arrangement of the present invention;
FIG. 8 is a schematic view of an upper return air roadway, a process connection roadway and a lower intake air haulage roadway of the present invention;
Fig. 9 is a schematic sectional view of the space arrangement of the roadway according to the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others.
as shown in fig. 3-9, in some illustrative embodiments, the present invention provides a method of caving coal from a medium thickness coal seam with an oversize dip angle, comprising: roadway construction, equipment installation and production process.
Wherein, the tunnel construction includes: a coal seam 1 with a required height is selected, a lower air inlet transportation roadway 5 is drilled in the coal seam 1, the tail end of the lower air inlet transportation roadway 5 serves as a coal falling working surface 6, namely the lower air inlet transportation roadway 5 and the coal falling working surface 6 are horizontal, and an upper air return roadway 3 is drilled on the upper portion of the coal falling working surface 6. Meanwhile, a process connection roadway 4 is constructed, the process connection roadway 4 is drilled on the rock stratum 2 on the side face of the coal seam 1, and the process connection roadway 4 is communicated with the upper air return roadway 3 and the lower air inlet transportation roadway 5 respectively.
The tunnel construction process still includes: and a plurality of safety control holes 15 communicated with the coal seam 1 or the rock stratum 2 are arranged in the process communication roadway 4. The safety control hole 15 is used for processing the looseness and gas extraction of the coal seam 1, processing the caving of the overlying rock stratum 2 of the coal seam 1 and various water on the upper part of the coal seam, and eliminating the potential safety hazard of coal mining.
wherein, equipment fixing includes: and mining equipment is arranged in the lower air inlet transportation roadway 5. The process of installing mining equipment in the lower air intake haulage roadway includes: a rail 7 is installed in the lower air inlet transportation roadway 5 and used for transporting installed equipment, a hydraulic support 11 before coal recovery and a hydraulic support 12 after coal recovery are installed at first, then a reversed loader 10 and a reversed loader pulley 8 are installed, the reversed loader 10 is hinged with the hydraulic support 11 before coal recovery, a machine head of the reversed loader 10 is lapped on the reversed loader pulley 8 of the mining equipment, the reversed loader pulley 8 is installed on the rail 7, and a belt conveyor 9 parallel to the rail 7 is laid in the lower air inlet transportation roadway 5.
the local main fan 17 is installed in the upper return air tunnel 3 at the intersection of the upper return air tunnel 3 and the process connection tunnel 4. The local main fan 17 is used for pumping harmful gas generated by scattered coal 19 on the upper part of the coal dropping working surface 6 into the upper return air tunnel 3 and accelerating the flow of the wind speed in the upper return air tunnel 3.
Wherein, the production process comprises:
The local main fan 17 works to enable air 16 to enter along the lower air inlet transportation roadway 5, flow into the upper air return roadway 3 through the process connection roadway 4 and be discharged, and the local main fan 17 discharges gas above the coal drop working face 6 and accelerates the flow of the gas in the upper air return roadway 3;
The falling rock body 18 pushes the loosened coal at the lower part to flow downwards, the coal discharging inserting plate 14 on the hydraulic support 12 performs telescopic action after coal return, so that the falling coal falls onto the reversed loader 10 in the mining equipment, the falling coal 19 falls onto the tail of the reversed loader 10, the fallen coal 19 is conveyed to the ground through the belt conveyor 9 by the reversed loader 10, and when the coal stops flowing, the coal discharging tail beam 20 on the hydraulic support 12 swings after coal return, and the coal is loosened to flow.
In some illustrative embodiments, the present disclosure also provides a superdip angle medium thickness coal seam caving coal mining system comprising: the mining equipment is arranged in the lower air inlet transportation roadway 5.
The mining apparatus includes: the device comprises a coal return front hydraulic support 11, a coal return rear hydraulic support 12, a reversed loader 10, a reversed loader pulley 8, a track 7, a belt conveyor 9, a swing oil cylinder 13, a coal discharge tail beam 20, a telescopic oil cylinder 21 and a coal discharge inserting plate 14.
One end of the reversed loader 10 is arranged in the coal return front hydraulic support 11 and the coal return rear hydraulic support 12, and the other end is hinged with the reversed loader pulley 8. The transshipment pulley 8 is arranged on the track 7, and the belt conveyor 9 is parallel to the track 7 and is laid in the lower air inlet transportation roadway 5.
The swing oil cylinder 13 and a coal discharge tail beam 20 for loosening the coal bed are arranged on the coal return rear hydraulic support 12, and the coal discharge tail beam 20 is hinged with the coal return rear hydraulic support 12; the action end of the swing oil cylinder 13 is connected with the coal discharge tail beam 20, the fixed end of the swing oil cylinder is connected with the coal return rear hydraulic support 12, and when the swing oil cylinder 13 does telescopic motion, the coal discharge tail beam 20 is driven to swing on the coal return rear hydraulic support 12, so that loose and scattered coal 19 is achieved.
The coal caving tail beam 20 is internally provided with a telescopic oil cylinder 21 and a coal caving inserting plate 14 for blocking coal and caving coal, the action end of the telescopic oil cylinder 21 is connected with the coal caving inserting plate 14, when the telescopic oil cylinder 21 acts, the coal caving inserting plate 14 is driven to reciprocate on the coal caving tail beam 20, namely the coal caving inserting plate 14 stretches on the coal caving tail beam 20, and when a falling rock body 18 pushes the scattered coal 19 to fall, the coal caving inserting plate 14 stretches to realize coal caving.
The action end of the oil cylinder is the end which moves when the oil cylinder works, and the other end is a fixed end. The hydraulic support 12 behind the coal recovery, the hydraulic support 11 before the coal recovery and the reversed loader 10 mutually guide and walk.
the invention also discloses a caving coal mining system for the medium and thick coal seam with the extra-large dip angle, which comprises the following steps: and the local main fan 17 is arranged in the upper return air roadway 3 and is positioned at the intersection point of the upper return air roadway 3 and the process connection roadway 4. The local main fan 17 is used for pumping harmful gas generated by scattered coal 19 on the upper part of the coal dropping working surface 6 into the upper return air tunnel 3 and accelerating the flow of the wind speed in the upper return air tunnel 3.
the caving coal mining system for the medium and thick coal seam with the extra-large dip angle needs roadway construction before use, and the roadway construction comprises the following steps: lower portion air inlet haulage roadway 5 is drilled in coal seam 1, and the end of lower portion air inlet haulage roadway 5 is as coal breakage working face 6, and lower portion air inlet haulage roadway 5 is level with coal breakage working face 6 promptly, and drills out upper portion return air tunnel 3 on coal breakage working face 6 upper portion. A process connecting roadway 4 is drilled on the rock stratum 2 on the side face of the coal seam 1, and the process connecting roadway 4 is communicated with an upper air return roadway 3 and a lower air inlet transportation roadway 5 respectively. And a plurality of safety control holes 15 communicated with the coal seam 1 or the rock stratum 2 are arranged in the process communication roadway 4. The safety control hole 15 is used for processing the looseness and gas extraction of the coal seam 1, processing the caving of the overlying rock stratum 2 of the coal seam 1 and various water on the upper part of the coal seam, and eliminating the potential safety hazard of coal mining.
The process of installing mining equipment in the lower air intake haulage roadway 5 includes: a rail 7 is installed in the lower air inlet transportation roadway 5 and used for transporting installed equipment, a hydraulic support 11 before coal recovery and a hydraulic support 12 after coal recovery are installed at first, then a reversed loader 10 and a reversed loader pulley 8 are installed, the reversed loader 10 is hinged with the hydraulic support 11 before coal recovery, a machine head of the reversed loader 10 is lapped on the reversed loader pulley 8 of the mining equipment, the reversed loader pulley 8 is installed on the rail 7, and a belt conveyor 9 parallel to the rail 7 is laid in the lower air inlet transportation roadway 5.
The local main fan 17 works so that the wind 16 enters along the lower air inlet transportation roadway 5, flows into the upper air return roadway 3 through the process connection roadway 4 and is discharged, and the local main fan 17 discharges the gas above the coal drop working surface 6 and accelerates the flow of the gas in the upper air return roadway 3.
The falling rock body 18 pushes the loosened coal at the lower part to flow downwards, the coal discharging inserting plate 14 on the hydraulic support 12 performs telescopic action after coal return, so that the falling coal falls onto the reversed loader 10 in the mining equipment, the falling coal 19 falls onto the tail of the reversed loader 10, the fallen coal 19 is conveyed to the ground through the belt conveyor 9 by the reversed loader 10, and when the coal stops flowing, the coal discharging tail beam 20 on the hydraulic support 12 swings after coal return, and the coal is loosened to flow.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
Claims (5)
1. The caving coal mining method for the medium-thickness coal seam with the extra-large dip angle is characterized by comprising the following steps of:
Drilling a lower air inlet transportation roadway in a coal seam, wherein the tail end of the lower air inlet transportation roadway serves as a coal breakage working face, and an upper air return roadway is drilled at the upper part of the coal breakage working face;
Drilling a process connecting roadway on a rock stratum on the side face of the coal seam, wherein the process connecting roadway is respectively communicated with the upper air return roadway and the lower air inlet transportation roadway;
Installing mining equipment in the lower air inlet transportation roadway;
the local main fan arranged in the upper return air roadway works to enable air to enter along the lower air inlet transportation roadway, flow into the upper return air roadway through the process connection roadway and be discharged;
the caving rock mass pushes the loose coal at the lower part to flow downwards, the coal discharging spile on the coal return rear hydraulic support in the mining equipment does telescopic action, so that the flowing-down coal falls into the reversed loader in the mining equipment, and when the coal stops flowing, the coal discharging tail beam on the coal return rear hydraulic support swings to loosen the coal to enable the coal to flow.
2. the method for caving coal in extra-large dip angle medium-thickness coal seams as claimed in claim 1, further comprising: and a plurality of safety control holes communicated to the coal bed or the rock stratum are arranged in the process communication roadway.
3. The method for mining the caving coal of the medium and thick coal seam with the extra large inclination angle according to claim 2, wherein the process of installing mining equipment in the lower air intake transportation roadway comprises the following steps: and overlapping the machine head of the reversed loader on a reversed loader pulley of the mining equipment, installing the reversed loader pulley on a track in the mining equipment, and paving a belt conveyor parallel to the track in the mining equipment in the lower air inlet transportation roadway.
4. super large inclination medium thickness coal seam caving coal mining system, its characterized in that includes: the mining equipment is arranged in the lower air inlet transportation roadway; the mining apparatus includes: the coal recovery device comprises a coal recovery front hydraulic support, a coal recovery rear hydraulic support and a reversed loader, wherein the end part of the reversed loader is arranged in the coal recovery front hydraulic support and the coal recovery rear hydraulic support, a swing oil cylinder and a coal discharge tail beam are arranged on the coal recovery rear hydraulic support, and the action end of the swing oil cylinder is connected with the coal discharge tail beam, so that the coal discharge tail beam is driven to swing on the coal recovery rear hydraulic support when the swing oil cylinder does telescopic motion; the coal caving tail beam is provided with a telescopic oil cylinder and a coal caving inserting plate, and the action end of the telescopic oil cylinder is connected with the coal caving inserting plate, so that the coal caving inserting plate is driven to move on the coal caving tail beam in a reciprocating manner when the telescopic oil cylinder acts; further comprising: the local main fan is arranged in the upper return air roadway.
5. The super dip angle medium thickness seam caving coal mining system of claim 4, wherein said mining apparatus further comprises: a transfer pulley, a track and a belt conveyor; the elevating conveyor is characterized in that one end of the reversed loader is arranged in the hydraulic support before coal returning and the hydraulic support after coal returning, the other end of the reversed loader is hinged to the reversed loader pulley, the reversed loader pulley is arranged on the track, and the belt conveyor is parallel to the track and laid in the lower air inlet transportation roadway.
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| CN201910981889.9A CN110578523A (en) | 2019-10-16 | 2019-10-16 | Method and system for mining top coal of medium-thickness coal seam with extra-large dip angle |
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| CN201910981889.9A CN110578523A (en) | 2019-10-16 | 2019-10-16 | Method and system for mining top coal of medium-thickness coal seam with extra-large dip angle |
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| CN111119892A (en) * | 2020-01-03 | 2020-05-08 | 高九华 | By-pass air return extra-large inclination angle medium-thickness coal seam caving coal mining system |
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| CN113803070A (en) * | 2021-10-27 | 2021-12-17 | 西安科技大学 | Horizontal subsection coordinated mining method for steeply inclined short-distance ultra-thick coal group |
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| CN111119892A (en) * | 2020-01-03 | 2020-05-08 | 高九华 | By-pass air return extra-large inclination angle medium-thickness coal seam caving coal mining system |
| CN111551084A (en) * | 2020-06-05 | 2020-08-18 | 华北科技学院 | Deep hole blasting coal breakage method for large-dip-angle coal seam |
| CN113803070A (en) * | 2021-10-27 | 2021-12-17 | 西安科技大学 | Horizontal subsection coordinated mining method for steeply inclined short-distance ultra-thick coal group |
| CN113803070B (en) * | 2021-10-27 | 2024-02-27 | 西安科技大学 | Horizontal sectional coordination mining method for steep short-distance super-thick coal group |
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