CN112211636B - Comprehensive mechanized coal mining method for irregular block sections - Google Patents
Comprehensive mechanized coal mining method for irregular block sections Download PDFInfo
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- CN112211636B CN112211636B CN202011291376.4A CN202011291376A CN112211636B CN 112211636 B CN112211636 B CN 112211636B CN 202011291376 A CN202011291376 A CN 202011291376A CN 112211636 B CN112211636 B CN 112211636B
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- 239000003245 coal Substances 0.000 title claims abstract description 120
- 238000005065 mining Methods 0.000 title claims abstract description 61
- 230000001788 irregular Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012546 transfer Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims description 3
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- 238000007726 management method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 210000003128 head Anatomy 0.000 description 3
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- 238000011084 recovery Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
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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
- E21D23/0004—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face
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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
- E21F13/00—Transport specially adapted to underground conditions
- E21F13/06—Transport of mined material at or adjacent to the working face
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Abstract
The invention discloses a comprehensive mechanized coal mining method for irregular block sections, which is characterized by comprising the following steps of: under the condition that the support strength of the support and the empty roof distance of the front end of the support top beam are unchanged, coal is cut by using a fully-mechanized coal mining machine or a continuous coal mining machine; loading the cut coal to a shuttle car by using the fully-mechanized coal mining machine or the continuous miner; and the shuttle car is adopted to convey the coal to a transfer conveyor of a transportation chute for unloading the coal, and the transfer conveyor is used for transferring the coal to a rubber belt conveyor for conveying the coal to the ground. According to the invention, the shuttle car is used for carrying coal, and for irregular block sections, the connection between the working face head or tail support and the scraper conveyor is not required to be removed, so that the working face which is lengthened or shortened is adapted to by adding or reducing the working face support in the retracting passage.
Description
Technical Field
The invention relates to the technical field of coal resource exploitation, in particular to a comprehensive mechanized coal mining method for irregular block sections.
Background
The coal resources in China are rich, and the consumption of the coal accounts for larger consumption proportion of primary energy. Experts expect that by 2030, the contribution rate of coal resources in China to economic development can occupy more than 50% in primary energy. In the coal mining process, a mode that a transportation gateway and an open-cut hole are mutually perpendicular is generally adopted to arrange a working face. The arrangement mode of the working face inevitably generates irregular block sections (triangular coal) which are not suitable for fully-mechanized mining of the long wall of the coal mining machine, thereby wasting a large amount of high-quality coal resources and reducing the resource recovery rate. Due to faults and other geological formations, regular working surfaces cannot be arranged, and irregular block segments can also be generated.
In addition, since protection of mine roadways requires a large number of coal pillars to be left, such irregular mining areas should be mined as the coal mining approaches tailsound. Mine practitioners have made some improvements in coal mining methods, such as short wall continuous mining and wangweili mining, to liberate irregular block section pressed coal. However, when the above-mentioned corner coal mining technique is applied, the new open-cut hole will have a large influence on the triangular coal mining, so most mines will choose to mine the corner coal first and mine the longwall face later, which seriously affects the normal longwall face mining operation, so that the mine cannot realize efficient mining.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a comprehensive mechanized coal mining method for irregular block sections. In order to achieve the above purpose, the invention adopts the following technical scheme: the comprehensive mechanized coal mining method for the irregular block section is characterized by comprising the following steps of:
firstly, under the condition that the support strength of the support and the empty top distance of the front end of the support top beam are unchanged, coal is cut by using a fully-mechanized coal mining machine or a continuous coal mining machine;
step two, loading the cut coal on a shuttle car by utilizing the fully-mechanized coal mining machine or the continuous miner in the step one;
and thirdly, unloading coal from the transfer conveyor which is used for conveying the coal to the transportation chute by adopting the shuttle car in the second step, and conveying the coal to the rubber belt conveyor by the transfer conveyor to the ground.
The comprehensive mechanized coal mining method for the irregular block section is characterized in that a working face is supported by a working face hydraulic support in support, and the working face hydraulic support is pushed to move by a baffle;
the comprehensive mechanized coal mining method for the irregular block section is characterized in that the fully-mechanized coal mining machine or the continuous coal mining machine withdraws from the working surface after cutting coal, and then a coal shoveling plate and a drawing frame are pushed to complete a working cycle;
the distance between the coal shoveling plate and the pulling frame is consistent with the cutting depth every time, the existing support is matched, and each coal cutter pushes and pulls the frame twice; in the process of exiting the fully-mechanized excavating machine, the following machine pushes a shovel and pulls a frame from the tail to the machine head once; then after the fully-mechanized coal mining machine exits the working face, the machine head pushes the shovel to the tail and the frame is pulled once, so that one coal cutting cycle is completed.
The comprehensive mechanized coal mining method for the irregular block section is characterized in that when the included angle between the working face return air roadway and the open-cut hole is an obtuse angle, a working face hydraulic support is preset in the retracting channel, and the working face hydraulic support preset in the retracting channel is increased to a part which is lengthened due to the pushing of the working face along with the pushing of the working face.
The comprehensive mechanized coal mining method for the irregular block section is characterized in that when the included angle between the working face return air roadway and the open-cut hole is an obtuse angle, the working face hydraulic support of the shortened part of the working face is retracted to the retracted channel along with the pushing of the working face.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the shuttle car is used for transporting coal, and for irregular block sections, the connection between the working face machine head or the machine tail support and the scraper conveyor is not required to be dismantled, so that the mining efficiency is improved.
2. The invention does not adopt a scraper conveyor to convey coal, so that a bracket can be directly added to a working surface or withdrawn to a withdrawal channel, and the connection between a working surface head or tail bracket and the scraper conveyor is not required to be removed, thereby realizing the adaptation to a lengthened or shortened working surface in a manner of adding or reducing the working surface bracket in the withdrawal channel.
3. The working face support is supported by adopting the working face hydraulic support, and the working face hydraulic support can move by means of the side ledge of the coal baffle plate, so that the automatic movement is realized under the condition of not being connected with the scraper conveyor. 4. The invention not only can mechanically mine the rest irregular coal mining block sections of the mine, but also can mechanically mine the main roadway protective coal pillar before the mine coal seam mining is finished.
The invention is described in further detail below with reference to the drawings and examples.
Drawings
Fig. 1 is a configuration diagram of equipment with an included angle between an irregular working surface return air tunnel and an open-cut eye being an obtuse angle.
Fig. 2 is a layout diagram of the equipment with the included angle between the return air tunnel and the open-cut eye of the irregular working surface as an acute angle.
FIG. 3 is a diagram of an integrated mechanized irregular surface and roadway layout of the present invention.
Reference numerals illustrate:
1-a hydraulic bracket at a stope line of a working face; 2-a reversed loader;
3-a fully-mechanized excavating machine; 4, a working face hydraulic support; 5, a working face return air cis-slot;
6, a working face transportation gateway 7, a working face to-be-mined body; 8-a shuttle car;
9, working face goaf; 10, stopping a mining line on a regular working surface;
11-cutting the irregular working surface; 12-coal belt conveyor lane;
13, a coal tray area return airway; 14-coal tray area east-side major road.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the invention is susceptible of embodiment in the drawings, it is to be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided to provide a more thorough and complete understanding of the invention. It should be understood that the drawings and embodiments of the invention are for illustration purposes only and are not intended to limit the scope of the present invention.
The invention discloses a comprehensive mechanized coal mining method for irregular block sections.
After the comprehensive mechanized coal mining machine cuts coal to a regular longwall working face stoping line 10, under the condition that the strength of the support 1 and the empty top distance of the front end of the support top beam are unchanged, cutting coal by using a fully-mechanized coal mining machine or a continuous coal mining machine 3, and conveying coal by using a shuttle car 8; coal is loaded onto a shuttle car 8 using a fully-mechanized or continuous miner 3. The shuttle car 8 conveys coal to the transportation gate 6, and the coal is discharged through the transfer conveyor 2 and is transferred to the rubber belt conveyor by the transfer conveyor 2 to be conveyed to the ground.
In this embodiment, the shuttle car is used for transporting coal, and for irregular block segments, no connection between the working face head or tail support and the scraper conveyor is required to be removed, so that the working face with a longer or shorter length can be adapted by adding or subtracting the working face support in the retracting channel.
In the support, the working face is supported by a working face hydraulic support, the irregular working face hydraulic support 4 is pushed by a coal baffle plate side ledge, and the support moving does not need the assistance of a scraper conveyor. The roof management method adopts the collapse type roof management, which is the same as the original regular working face.
The fully-mechanized coal mining machine or the continuous miner 3 withdraws from the working surface after cutting a coal cutter, and then the coal shoveling plate and the drawing frame are pushed to complete a working cycle. The distance between the coal shoveling plate and the pulling frame is consistent with the cutting depth every time, and the coal pushing frame is pushed and pulled twice every time. In the process of exiting the fully-mechanized coal mining machine, the following machine pushes the shovel and the pulling frame from the tail to the machine head once. Then after the fully-mechanized coal mining machine exits the working face, the machine head pushes the shovel to the tail and the frame is pulled once, so that one coal cutting cycle is completed.
When the working surface is pushed to the irregular block section, the length of the working surface is changed compared with the length of the original regular working surface for opening and cutting eyes, and the invention adapts to the length of the working surface which is lengthened or shortened by flexibly increasing or reducing the working surface bracket 4 in the return air slot 5.
Specifically, when the included angle between the working face return roadway and the open-cut hole is an obtuse angle, a working face hydraulic support is preset in the retracting channel, and the working face hydraulic support preset in the retracting channel is increased to a part which is lengthened due to the pushing of the working face along with the pushing of the working face; when the included angle between the working face return air tunnel and the open-cut eye is an obtuse angle, the working face hydraulic support of the shortened part of the working face is retracted to the retraction channel along with the pushing of the working face. The method is suitable for mechanized rapid mining of irregular working surfaces with large length variation range, not only can mechanically rapidly mine the rest irregular coal mining block sections of the mine, but also can mechanically rapidly mine the main roadway protective coal pillars before the mining of the mine coal seam is finished. Referring to fig. 1 and 2, fig. 1 is a schematic view of an apparatus for forming an obtuse angle between an irregular surface return tunnel 5 and an open-cut eye 11 according to an embodiment. Fig. 2 is a schematic view of an embodiment of the equipment configuration when the angle between the irregular working surface return air tunnel 5 and the open-cut hole 11 is acute. In fig. 1 and 2, the open cut length is L.
The invention is further described below in connection with the working surfaces 14201-14207 and 14204-14208 of the 4-2 coal seam available from Huixing mining Co.
The 4-2 coal seam 14201-14207 working face and the 14204-14208 working face of Huixing mining Co Ltd can produce irregular block sections of coal resources of about 70 ten thousand tons.
Through years of comprehensive mining practice and theoretical verification, the comprehensive mechanized rapid mining is carried out on irregular block sections of the 4-2 coal seam by adopting a comprehensive excavator or continuous miner, and the comprehensive mechanized irregular working surface and roadway arrangement are shown in figure 3.
(1) Irregular working face yield
The length of the irregular working surface is 20-100 meters, and the average length is 60 meters. The average coal feeding per shift is carried out, and the cycle progress is 1.46m. One cycle of coal cutting per shift, the shift yield is as follows: 1.46×3.6×60×1.3=410 (ton). Monthly production is calculated by 25 days, and the monthly yield of the working surface is as follows: 410×3×25= 30750 (ton).
(2) Safety production of irregular working surface
(1) Comprehensive mechanical irregular working face support adopts a fully mechanized mining support and a liquid supply system, the roof control area of the working face after coal cutting is consistent with that of fully mechanized mining, and a caving roof is managed. The hydraulic support can completely meet the safety requirement of roof management.
(2) The trackless electric explosion-proof shuttle car matched with the scheme is a mature product which is used for years in large and medium coal mines, and is safe and reliable.
(3) The mining of the irregular working face adopts a normal negative pressure ventilation system and a safety monitoring system, is consistent with the normal fully-mechanized mining face, and can meet the national safety management requirement.
(3) Economic and social benefit analysis
After 5-2 coal exploitation is finished, the coal resources of irregular blocks of the mine exceed 120 ten thousand tons. The total coal resources of the mine can be extracted by about 190 ten thousand tons, and the economic benefit can be 57000 ten thousand yuan. In the Shenmu area, because of more small and medium coal mines, the area of the well field is irregular, and the irregular small blocks formed by mine exploitation are more. The whole Shenmu area has more than 120 mines, each mine is calculated according to 100 ten thousand tons of recovered coal resources, one hundred million twenty millions of tons of recovered coal resources can be recovered, and the economic benefit is good. If the coal mining method is widely popularized and applied nationwide, the economic benefit can be more considerable.
The invention does not adopt a scraper conveyor to convey coal, so that a bracket can be directly added to a working surface or withdrawn to a withdrawal channel, and the connection between a working surface head or tail bracket and the scraper conveyor is not required to be removed, thereby realizing the adaptation to a lengthened or shortened working surface in a manner of adding or reducing the working surface bracket in the withdrawal channel.
The invention not only can mechanically mine the rest irregular coal mining block sections of the mine, but also can mechanically mine the main roadway protective coal pillar before the mine coal seam mining is finished.
According to the invention, the coal recovery rate is improved by recovering the coal resources of the irregular block section, and the method has good economic benefit.
The foregoing description is only a preferred embodiment of the invention, and is not intended to limit the invention in any way, and any simple modification, variation and equivalent structural transformation made to the above embodiment according to the technical matter of the invention still fall within the scope of the technical scheme of the invention.
Claims (1)
1. The comprehensive mechanized coal mining method for the irregular block section is characterized by comprising the following steps of:
firstly, under the condition that the support strength of the support and the empty top distance of the front end of the support top beam are unchanged, coal is cut by using a fully-mechanized coal mining machine or a continuous coal mining machine;
step two, loading the cut coal on a shuttle car by utilizing the fully-mechanized coal mining machine or the continuous miner in the step one;
step three, unloading coal from a transfer conveyor which conveys the coal to a transportation chute by adopting the shuttle car in the step two, and conveying the coal to a rubber belt conveyor by the transfer conveyor to the ground;
the first step is to adopt a working face hydraulic support for supporting, wherein the working face hydraulic support is pushed to move by a baffle;
in the second step, the fully-mechanized coal mining machine or the continuous miner withdraws from the working surface after cutting the coal with a cutter, and then the coal shoveling plate and the drawing frame are pushed to complete a working cycle;
step two, the distance between the coal shoveling plate and the pulling frame is consistent with the cutting depth in each pushing, supporting the existing bracket, and pushing and pulling the frame twice for each coal knife; in the process of exiting the fully-mechanized excavating machine, the following machine pushes a shovel and pulls a frame from the tail to the machine head once; then after the fully-mechanized coal mining machine exits the working face, pushing the shovel from the machine head to the machine tail and pulling the frame once to complete a coal cutting cycle;
when the included angle between the working face return air tunnel and the open-cut hole is an obtuse angle, a working face hydraulic support is preset in the retracting channel, and the working face hydraulic support preset in the retracting channel is increased to a part which is lengthened due to the pushing of the working face along with the pushing of the working face;
and step two, when the included angle between the working face return air tunnel and the open-cut hole is an acute angle, the working face hydraulic support of the shortened part of the working face is retracted to the retraction channel along with the pushing of the working face.
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| CN202011291376.4A CN112211636B (en) | 2020-11-18 | 2020-11-18 | Comprehensive mechanized coal mining method for irregular block sections |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB283598A (en) * | 1927-01-15 | 1929-02-14 | Demag Ag | Improvements in methods and means for filling in disused workings and the like in mines |
| CN102704935A (en) * | 2012-05-31 | 2012-10-03 | 库尔勒金川矿业有限公司 | Extra-long working surface fully mechanized coal mining process |
| CN104500069B (en) * | 2014-11-27 | 2017-03-22 | 中国煤炭科工集团太原研究院有限公司 | Continuous coal mining machine top-coal mining process for extremely-thick coal seam bound coal |
| CN111305842B (en) * | 2020-03-13 | 2021-08-03 | 天地(榆林)开采工程技术有限公司 | Rapid butt joint installation method based on cutter handle type fully mechanized coal mining face |
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Address after: 719300 Ma Jia Ta Xiang Eat Kai Gou Cun, Shenmu City, Yulin City, Shaanxi Province Patentee after: Shenmu Huixing Mining Co.,Ltd. Address before: 719300 chikaigou village, Majiata Township, Shenmu City, Ankang City, Shaanxi Province Patentee before: Shenmu Huixing Mining Co.,Ltd. |
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