CN114352275B - Underground coal mining method - Google Patents
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- CN114352275B CN114352275B CN202111480950.5A CN202111480950A CN114352275B CN 114352275 B CN114352275 B CN 114352275B CN 202111480950 A CN202111480950 A CN 202111480950A CN 114352275 B CN114352275 B CN 114352275B
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- 239000003245 coal Substances 0.000 title claims abstract description 175
- 238000005065 mining Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 91
- 238000005520 cutting process Methods 0.000 claims abstract description 78
- 239000004484 Briquette Substances 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 18
- 238000005299 abrasion Methods 0.000 abstract description 3
- 238000001125 extrusion Methods 0.000 abstract description 3
- 230000036346 tooth eruption Effects 0.000 abstract description 3
- 230000000875 corresponding effect Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The invention provides an underground coal mining method, which comprises the following steps: cutting the coal wall by utilizing water jet to form a plurality of coal blocks; and the coal briquette is impacted by utilizing the coal dropping equipment so as to drop into the conveying equipment. According to the method, the traditional drum shearer is used for cutting broken coal walls by water jet to cut the coal walls, and as the coal walls are already cut into blocks, only the coal blocks are required to be collided and the coal is required to be guided to fall in the coal mining process, so that the load power of the shearer and the abrasion of cutting teeth can be greatly reduced; meanwhile, extrusion stress can not be generated on the coal wall, and the coal wall is effectively prevented from collapsing.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to an underground coal mining method.
Background
In the existing fully-mechanized mining process, a roller coal cutter or a coal planer is adopted for mining. In the cutting process, the cutting resistance is high, a large amount of dust is generated on the working face in the cutting process, and the cutting pick collides with the coal wall to generate the internal stress of the coal bed when the traditional coal mining machine is used for cutting, so that the mechanical property of the coal bed is influenced and changed. Meanwhile, sparks can be generated by friction in the cutting and crushing process, a certain potential safety hazard exists, and additional spraying equipment is required to be installed to prevent coal dust from spreading and sparks from being generated.
In the existing water mining process, high-pressure water jet is adopted for mining, and the high-pressure water jet is utilized to impact the surface of a coal bed to break up coal bodies, and hydraulic medium is used for completing the procedures of transportation, classification, lifting and the like. Meanwhile, the hydraulic transportation is carried out, a large amount of coal blocks are mixed with water to form slime water, and the yield and recovery rate of the lump coal are low. The hydraulic coal mining method without support is mainly adopted in the water mining process.
In carrying out the invention, the inventors have found that at least the following problems exist in the prior art: the sizes of coal blocks cut by a drum shearer or a coal planer are different, the yield of the block coal is low, and the quality of the coal is influenced. In the coal cutting process, the roller cutting pick is frequently worn, needs to be replaced, influences the working efficiency, increases the production cost and brings safety risks. In the water mining process, the requirement on the conditions of the top and bottom plates of the coal seam, particularly the top plate, becomes one of the main factors for limiting the popularization and application of hydraulic coal mining at present. For the coal seam with poor top plate stability, accidents such as midway falling and the like are frequent, and the recovery rate and the labor productivity are affected; the rock burst problem is more remarkable when the water mining is applied under the condition that the top plate is hard. The roadway in the water mining working face is dense. The coal body is severely cut, the integrity is weakened, the support stiffness is reduced, and the coal body is often affected by mining. The tunnel is extremely easy to be compressed and damaged, so that the stoping and tunneling are difficult. The problem of mine pressure is particularly pronounced in thick coal seams. The problem of supporting the water mining process affects the safety production.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the invention aims to provide a method for mining underground coal mine, which can improve the yield of lump coal.
In order to achieve the above object, the present invention provides a method for mining underground coal mine, which comprises:
cutting the coal wall by utilizing water jet to form a plurality of coal blocks;
and the coal briquette is impacted by utilizing the coal dropping equipment so as to drop into the conveying equipment.
According to the method, the traditional drum shearer is used for cutting broken coal walls by water jet to cut the coal walls, and as the coal walls are already cut into blocks, only the coal blocks are required to be collided and the coal is required to be guided to fall in the coal mining process, so that the load power of the shearer and the abrasion of cutting teeth can be greatly reduced; meanwhile, extrusion stress can not be generated on the coal wall, and the coal wall is effectively prevented from collapsing.
According to one embodiment of the invention, the method comprises:
installing a water cutting device on equipment on a fully-mechanized coal mining face;
the water cutting device generates a water jet.
According to one embodiment of the invention, one end of the coal block is suspended, and the other end of the coal block is connected to the primary coal wall.
According to one embodiment of the invention, the depth of the coal block is 0.1m to 2m, the front length of the coal block is 1cm to 500cm, and the kerf width of the adjacent coal block is 0.5mm to 100mm.
According to one embodiment of the invention, the equipment on the fully mechanized face is one or more of a hydraulic support, a scraper conveyor and a shearer.
According to one embodiment of the invention, the method comprises:
the coal briquette is impacted by using a drum of a coal mining machine so as to fall into a conveyor trough.
According to one embodiment of the invention, the method comprises:
judging whether the distance between the water cutting device and the running front end of the coal cutter is smaller than a threshold value, and if the judgment result is yes, stopping cutting the coal wall by the water cutting device, retracting the side protection plates of the hydraulic support, retracting the water cutting device along with the side protection plates in sequence, and cutting coal from the coal blocks by the coal cutter in one direction;
and the hydraulic support behind the operation of the coal mining machine forwards pushes the newly exposed top plate to support, whether the distance between the water cutting device and the operation rear end of the coal mining machine is larger than a threshold value is judged, and under the condition that the judgment result is yes, the water cutting device stretches out and begins to cut the coal wall.
According to one embodiment of the invention, the water cutting device is arranged below the top beam of the hydraulic bracket, the water cutting device comprising:
the platform is connected with the top beam through a telescopic cylinder;
the water cutting spray head is rotatably arranged on the platform;
the control unit is connected with the water cutting spray head through a high-pressure pipeline and is used for controlling the direction and cutting action of the water cutting spray head.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic flow chart of a method for mining a coal mine in a well according to an embodiment of the invention.
FIG. 2 is a first operational schematic diagram of coal mining downhole using water jets in accordance with an embodiment of the present invention.
FIG. 3 is a second schematic diagram illustrating water jet mining according to an embodiment of the present invention.
The coal mining system comprises a coal mining layer 1, a water cutting spray head 2, a water cutting device 3, a top beam 4, a control unit 5, a water injection pipeline 6, a platform 7, coal blocks 8 and a roller 9.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention. On the contrary, the embodiments of the invention include all alternatives, modifications and equivalents as may be included within the spirit and scope of the appended claims.
The invention is described in further detail below with reference to the accompanying drawings and specific examples.
Example 1
FIG. 1 is a schematic flow chart of a method for mining a coal mine in a well according to an embodiment of the invention.
Referring to fig. 1-3, the underground coal mining method provided by the embodiment includes the following steps:
and S104, cutting the coal wall by utilizing water jet flow to form a plurality of coal blocks 8.
In the step, the coal wall is an object of coal mining work and refers to a coal body to be mined on a coal mining working face. The coal wall is positioned on the wall surface of the coal mining layer 1.
The coal wall is cut into strip-shaped coal blocks with one end connected to the original coal wall and the other end suspended by water jet.
And S106, utilizing coal dropping equipment to impact the coal blocks 8 so as to drop the coal blocks into the conveying equipment.
Because the coal blocks are suspended before impact, the impact force on the coal blocks is smaller than the direct coal mining force of the prior coal mining machine. The coal dropping device can use common underground equipment such as coal mining machines, coal planing machines and the like.
Through the steps, based on the characteristics of water jet cutting, sparks and dust cannot be generated in the cutting process, and the coal blocks are wetted in the cutting process so as to be convenient for subsequent transportation. Meanwhile, extrusion stress cannot be generated on the coal wall, and the coal wall can be effectively prevented from collapsing.
The kind and the mounting position of the means for forming the water jet can be determined according to the actual requirements. Whichever device is used to form the water jet, as long as the water jet is used to cut the coal wall into pieces, the coal wall can be cut without using the shearer drum in the prior art, and the problems in the prior art can be solved and the corresponding effects can be obtained.
Prior to step S104, the method may further include:
step S101, installing the water cutting device 3 on equipment on a fully-mechanized mining face.
Here, the equipment on the fully mechanized face is one or more of a hydraulic support, a scraper conveyor, and a shearer.
Step S103, the water cutting device 3 generates water jet.
As a possible implementation, one end of the coal block 8 is suspended and the other end is connected to the raw coal wall. The depth B of the coal blocks 8 is 0.1m to 2m, the front length A of the coal blocks 8 is 1cm to 500cm, and the kerf width C of the adjacent coal blocks 8 is 0.5mm to 100mm.
The shape and arrangement of the front face of the coal block can be determined according to actual requirements. Coal blocks with different shapes and arrangements can be formed by controlling the water knives of the water cutting device 3.
The embodiment of the invention improves the coal mining process, combines the water mining process with the fully mechanized mining process, and applies the water jet technology to the coal mining of the fully mechanized mining working face. The traditional drum shearer is changed into a water jet type coal wall cutting machine, the end face of a coal wall cut by the water jet technology is flat, smooth and vertical, the cut lump coal is flatter, and the yield of the lump coal and the use value and economic value of raw coal can be improved. The water jet cutting is a non-heat source high-energy jet beam mining process, the cooling effect of water can reduce the temperature rise during coal wall cutting, water is soaked into the coal wall during cutting, raw coal dust in the coal wall is moistened, so that the coal wall loses flying ability, a dust falling spraying device is not required to be installed, floating dust generated during cutting is effectively reduced, the danger caused by sparks in the cutting process is avoided, the mechanical and chemical properties of a coal bed are not changed due to thermal stress, safe cutting processing can be performed in a high-gas dangerous operation area, and the mining safety is improved.
Example two
Wherein parts identical to or corresponding to those of the first embodiment are designated by corresponding reference numerals. For simplicity, only the points of distinction between the second embodiment and the first embodiment will be described.
The underground coal mining method provided by the embodiment comprises the following steps:
the coal pieces 8 may be impacted into the conveyor trough using the shearer drum 9.
Because the coal wall is already cut into blocks, the coal mining machine only plays roles of bumping coal blocks and guiding coal to fall in the coal mining process, and the load power of the coal mining machine and the abrasion of cutting teeth can be greatly reduced.
Specifically, the underground coal mining method provided by the embodiment further includes:
judging whether the distance between the water cutting device 3 and the running front end of the coal mining machine is smaller than a threshold value, and if the judgment result is yes, stopping cutting the coal wall by the water cutting device 3, retracting the side protection plates of the hydraulic support, retracting the water cutting device 3 along with the side protection plates in sequence, and cutting coal from the coal blocks 8 by the coal mining machine in one direction;
and the hydraulic support behind the operation of the coal mining machine forwards pushes the newly exposed top plate to support, whether the distance between the water cutting device and the operation rear end of the coal mining machine is larger than a threshold value is judged, and if so, the water cutting device stretches out and begins to cut the coal wall.
When the coal mining machine runs from one end of the working face to the other end, a complete coal mining cycle is realized after corresponding working procedures are completed. And the coal mining process is repeated in a circulating way, so that a new coal mining circulating process is formed.
Alternatively, referring to fig. 2, the water cutting device 3 in the above method may be disposed under the top beam 4 of the hydraulic bracket, and the water cutting device 3 includes:
the platform is connected with the top beam 4 through a telescopic cylinder;
a water cutting nozzle 2 rotatably mounted on the platform;
the control unit 5 is connected with the water cutting spray head 2 through a water injection pipeline 6 and is used for controlling the direction and cutting action of the water cutting spray head 2.
The height and pitch angle of the water cutting spray head can be adjusted by stretching and retracting the telescopic cylinder, and the water cutting spray head 2 can rotate at a set angle, so that the coal wall can be cut in various modes. It can be appreciated that the water injection pipeline 6 can be placed inside the hydraulic support, so that the working space occupied by the pipeline is reduced, and inconvenience and safety risks caused when the pipeline of the water cutting device moves along with the device are avoided.
According to the underground coal mining method based on the water jet provided by the first embodiment and the second embodiment, the water cutting equipment is combined with the equipment on the fully-mechanized coal mining working face, the high-pressure water pump is connected with the water jet cutting equipment through the water injection pipe, the high-pressure water pump is pressurized during working, the high-pressure water flow reaches the nozzle of the water jet cutting equipment through the pipeline and is ejected out, the coal seam is crushed and cut, the coal mine support is ensured, meanwhile, the coal wall is effectively prevented from collapsing, and the coal mining process is improved.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. First feature any process or method description in the "under", "below" and "flow charts" of second features or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiment of the present invention.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (4)
1. A method of mining a coal mine downhole, the method comprising:
cutting the coal wall by utilizing water jet to form a plurality of coal blocks (8), wherein one end of each coal block (8) is suspended, and the other end of each coal block is connected to the primary coal wall;
the coal briquette (8) is impacted by utilizing coal dropping equipment so as to drop into conveying equipment;
wherein the method further comprises: installing a water cutting device (3) on equipment on a fully-mechanized coal mining working surface; the water cutting device (3) generates a water jet, wherein the water cutting device (3) is arranged below a top beam (4) of the hydraulic support, and the water cutting device (3) comprises: the water injection device comprises a platform, a water cutting spray head (2) and a control unit (5), wherein the platform is connected with a top beam (4) through a telescopic cylinder, the water cutting spray head (2) is rotatably arranged on the platform, the control unit (5) is connected with the water cutting spray head (2) through a water injection pipeline (6) and is used for controlling the pointing and cutting actions of the water cutting spray head (2), and the water injection pipeline (6) is arranged in the hydraulic support;
the method further comprises the steps of: judging whether the distance between the water cutting device (3) and the running front end of the coal mining machine is smaller than a threshold value, and under the condition that the judgment result is yes, stopping cutting the coal wall by the water cutting device (3), retracting the side protection plate of the hydraulic support, and retracting the water cutting device (3) along with the side protection plate in sequence, wherein the coal mining machine cuts coal on the coal blocks (8) in one direction; and the hydraulic support behind the operation of the coal mining machine forwards pushes the newly exposed top plate to support, whether the distance between the water cutting device (3) and the operation rear end of the coal mining machine is larger than a threshold value is judged, and under the condition that the judgment result is yes, the water cutting device (3) stretches out and begins to cut the coal wall.
2. A method of underground coal mining according to claim 1, wherein the depth of the coal blocks (8) is 0.1m to 2m, the length of the front face of the coal blocks (8) is 1cm to 500cm, and the kerf width of adjacent coal blocks (8) is 0.5mm to 100mm.
3. A method of underground mining according to claim 1, wherein the equipment on the fully mechanized face is one or more of a hydraulic prop, a scraper conveyor and a shearer.
4. A method of downhole coal mining according to claim 1, wherein the method comprises:
the coal (8) is impacted by a roller (9) of the coal mining machine so as to fall into a conveyor trough.
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| CN202111480950.5A CN114352275B (en) | 2021-12-06 | 2021-12-06 | Underground coal mining method |
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| CN202111480950.5A CN114352275B (en) | 2021-12-06 | 2021-12-06 | Underground coal mining method |
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| CN114352275B true CN114352275B (en) | 2024-04-09 |
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| CN118391016B (en) * | 2024-06-27 | 2024-09-17 | 华电煤业集团数智技术有限公司 | Coal mine fully-mechanized coal mining face control system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3827755A (en) * | 1971-12-11 | 1974-08-06 | Fletcher Sutcliffe Wild Ltd | Drum type rotary coal cutter with water jet orifices |
| CN101922290A (en) * | 2010-08-12 | 2010-12-22 | 浙江大学 | Coal-rock interface identification method, identification system and identification probe |
| CN101985877A (en) * | 2010-09-09 | 2011-03-16 | 王逢旦 | High pressure water jet cutting drum coal dropping double power shearer |
| CN103089256A (en) * | 2011-11-07 | 2013-05-08 | 刘素华 | Water cutting falling coal mining method and water cutting falling coal mining machine |
| CN113006785A (en) * | 2021-03-22 | 2021-06-22 | 神华神东煤炭集团有限责任公司 | High-pressure water jet coal mining machine and control method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11434761B2 (en) * | 2020-02-19 | 2022-09-06 | Joy Global Underground Mining Llc | Impact feedback system for longwall shearer operator |
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2021
- 2021-12-06 CN CN202111480950.5A patent/CN114352275B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3827755A (en) * | 1971-12-11 | 1974-08-06 | Fletcher Sutcliffe Wild Ltd | Drum type rotary coal cutter with water jet orifices |
| CN101922290A (en) * | 2010-08-12 | 2010-12-22 | 浙江大学 | Coal-rock interface identification method, identification system and identification probe |
| CN101985877A (en) * | 2010-09-09 | 2011-03-16 | 王逢旦 | High pressure water jet cutting drum coal dropping double power shearer |
| CN103089256A (en) * | 2011-11-07 | 2013-05-08 | 刘素华 | Water cutting falling coal mining method and water cutting falling coal mining machine |
| CN113006785A (en) * | 2021-03-22 | 2021-06-22 | 神华神东煤炭集团有限责任公司 | High-pressure water jet coal mining machine and control method thereof |
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