Scraper-free coal mining method for self-sliding coal seam by steel wire rope traction digging and mining machine

Abstract

The invention relates to the technical field of coal mining, and particularly discloses a self-sliding coal seam steel wire rope traction digging and mining machine scraper-free coal mining method which comprises the following steps: S1, roadway arrangement: digging an upper roadway and a lower roadway in a coal seam; the upper roadway is used for returning air and is provided with a self-propelled lifting equipment vehicle set, and the lower roadway is used for air inlet and coal transportation; the area between the upper roadway and the lower roadway is a working face; s2, coal cutting operation, wherein the self-propelled lifting equipment vehicle group drags the digging and mining machine to move upwards along the working face through a steel wire rope to cut coal; and S3, supporting the coal-mined working face according to the thickness of the mined coal seam and the crushing degree of the coal seam roof. According to the method, the defects of low yield and work efficiency, high tunneling rate and pitwood consumption, high labor intensity, low recovery rate, multiple unsafe factors and the like of various coal mining methods of the existing self-sliding coal seam in the aspects of application and effect to different degrees are overcome, and the competitive capacity of a mine with the self-sliding coal seam in the current market economy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, in particular to a scraperless coal mining method using a self-sliding coal seam steel wire rope traction excavator. Background Art

[0002] In the mining of self-sliding coal seams (inclination ≥ 40°), traditional coal mining methods have the following technical bottlenecks:

[0003] 1. Scraper conveyor has poor adaptability:

[0004] Traditional mechanized mining and fully mechanized mining rely on scraper conveyors to transport coal. However, when the inclination angle is greater than 25°, the scraper chain is prone to breakage and energy consumption increases dramatically, resulting in the working face cost accounting for as high as 30% to 40%. Extremely thin coal seams (thickness less than 0.8m) are difficult to install scraper conveyors due to space limitations, and blasting mining technology is forced to be used, which is inefficient and has a recovery rate of less than 60%.

[0005] 2. Coal mining machine stability defects:

[0006] The drum of traditional coal mining machines is arranged with its axis perpendicular to the coal wall. During the wire rope traction process, it is easy for the drum to "drift away" from the coal wall due to the reaction force, requiring frequent shutdowns and adjustments, and the cutting efficiency is reduced by more than 40%.

[0007] 3. High cost of roof and floor management:

[0008] Existing technology mostly uses hydraulic supports to support thin coal seam roofs, but the supports are heavy, the moving speed is slow, and the support cost per ton of coal is high.

[0009] Therefore, there is an urgent need to provide a scraperless coal mining method using a self-sliding coal seam wire rope traction mining machine. By integrating the wire rope traction mining machine with the scraperless self-sliding transportation system, unmanned, low-cost mechanized mining in steeply inclined coal seams can be achieved, thereby solving the problems existing in the above-mentioned existing technologies. Summary of the Invention

[0010] The purpose of the present invention is to provide a self-sliding coal seam wire rope traction mining machine scraper-free coal mining method to solve the problems existing in the above-mentioned prior art.

[0011] To achieve the above object, the present invention provides a scraper-free coal mining method using a self-sliding coal seam steel wire rope traction miner, comprising the following steps:

[0012] S1. Tunnel layout: excavate upper and lower tunnels in the coal seam; the upper tunnel is used for air return and is equipped with a self-propelled lifting equipment vehicle, and the lower tunnel is used for air intake and coal transportation; the area between the upper and lower tunnels is the working face;

[0013] S2, coal cutting operation, the self-propelled lifting equipment group uses a wire rope to pull the mining machine along the working face to cut coal;

[0014] S3. Support the working face after coal mining based on the thickness of the mined coal seam and the degree of fracture of the coal seam roof.

[0015] Preferably, the length of the working surface is 40 meters to 200 meters.

[0016] Preferably, the working surface is arranged in a positive tilt or a downward pseudo tilt.

[0017] Preferably, the mining machine adopts dual coaxial rollers, the axial directions of the two coaxial rollers of the mining machine are parallel to the coal wall of the working face, and the rocker arm of the mining machine is arranged between the two coaxial rollers.

[0018] Preferably, the angle between the rocker arm and the working surface is 45°.

[0019] Preferably, the swing amplitude of the rocker arm of the mining machine is 5° to 15°.

[0020] Preferably, the self-propelled lifting equipment vehicle group is provided with a pulley block, and the steel wire rope, cable and water pipe connecting the self-propelled lifting equipment vehicle group and the mining machine are all wound around the pulley block.

[0021] Preferably, when the coal seam thickness is less than 1.3 meters and the coal seam roof is not broken, the working face after coal mining is not supported; when the coal seam thickness is less than 1.3 meters but the coal seam roof is broken and cannot be naturally bent and closed after mining, and the coal seam thickness is not less than 1.3 meters, the working face after coal mining is supported.

[0022] Preferably, the support method adopts at least one of hydraulic support, single hydraulic support, downward pseudo-oblique segmented dense support, and adjustable flexible shielding support.

[0023] Preferably, the coal mining method is suitable for self-sliding coal seams with a coal seam inclination angle of 40° to 90°.

[0024] Compared with the prior art, the present invention has the following advantages and technical effects:

[0025] The scraperless coal mining method of the self-sliding coal seam wire rope traction miner provided by the present invention transforms ordinary machine mining and fully mechanized mining working faces into scraperless low-cost working faces, saving working face costs and enabling unmanned working faces during coal cutting; it transforms steeply inclined blasting working faces into machine mining working faces, realizing mechanized coal mining; for thin coal seams and extremely thin coal seams with supported working faces, when the coal seam roof is not broken, the support and scraper conveyor can be omitted, the working face is unmanned, the roof and floor plates are not broken, bent or closed, saving costs.

[0026] The present invention aims at coal seams with self-sliding characteristics and realizes unmanned and low-cost mechanized mining in steeply inclined coal seams by pulling a mining machine with a steel wire rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of coal mining operation using the present invention when the tunnel does not require support;

[0029] Figure 2 A schematic diagram of coal mining operations using the present invention when a tunnel requires support;

[0030] Figure 3 It is a schematic diagram of coal mining operation using the present invention when the working face is arranged in a pitching tilt;

[0031] In the figure: 1. Self-propelled lifting equipment vehicle group; 2. Mining machine; 3. Pulley block; 4. Wire rope; 5. Cable; 6. Water pipe; 7. Rocker arm; 8. Drum; 9. Scraper conveyor. DETAILED DESCRIPTION

[0032] It should be noted that, unless there is a conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other. The embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0033] like Figures 1 to 3 As shown, the present invention provides a scraper-free coal mining method using a wire rope traction miner in a self-sliding coal seam, which is suitable for self-sliding coal seams with a coal seam inclination of 40° to 90°, comprising the following steps:

[0034] S1. Tunnel layout: excavate upper and lower tunnels in the coal seam; the upper tunnel is used for return air and is equipped with a self-propelled hoisting equipment vehicle set 1, and the lower tunnel is used for air intake and coal transportation; the area between the upper and lower tunnels is the working face, which is 40 meters to 200 meters long and has a normal or downward-sloping layout;

[0035] S2, coal cutting operation, the self-propelled hoisting equipment group 1 pulls the mining machine 2 along the working face by the wire rope 4 to cut coal. The self-propelled hoisting equipment group 1 is provided with a pulley block 3. The wire rope 4, cable 5 and water pipe 6 connecting the self-propelled hoisting equipment group 1 and the mining machine 2 are all wound around the pulley block 3 to avoid breakage due to excessive bending;

[0036] The mining machine 2 adopts a double coaxial roller 8. The axial direction of the two coaxial rollers 8 of the mining machine 2 is parallel to the coal wall of the working face, which is significantly different from the arrangement of the axial direction of the rollers 8 of the traditional coal mining machine is perpendicular to the coal wall. The main movement direction of the picks of the two coaxial rollers 8 in contact with the coal body is from the inside of the coal wall to the outside of the coal wall, so that the rollers 8 bite the coal body tightly to prevent the mining machine 2 from drifting away from the coal wall under the action of traction. The rocker arm 7 of the mining machine 2 is set between the two coaxial rollers 8, and the angle between the rocker arm 7 and the working face is 45°, to prevent the rocker arm 7 from hindering the upward coal cutting of the mining machine 2; the coal cutting operation is carried out as a whole along the direction of the coal seam or the pseudo-inclined direction; in the continuous pulling process, the two coaxial rollers 8 continue to swing slightly along the axial direction, and the swing amplitude of the rocker arm 7 of the mining machine 2 is 5°~15°. The swing frequency matches the traction speed to ensure the coal cutting efficiency and uniform coal block size, thereby gradually cutting off the residual coal pieces between the rollers 8 and realizing continuous cutting; the mined coal blocks slide along the coal seam to the lower lane and are transported away by the scraper conveyor 9.

[0037] S3. Depending on the thickness of the mined coal seam and the degree of fracture of the coal seam roof and floor, the working face after coal mining may be supported or not; when the coal seam thickness is less than 1.3 meters and the coal seam roof is not fractured, the working face after coal mining is not supported, no one is working in the mining working face, the roof is bent and sunk without fracture through natural closure, and the floor is bulged without fracture through natural closure; when the coal seam thickness is less than 1.3 meters but the coal seam roof is fractured and the coal seam thickness is not less than 1.3 meters, the working face after coal mining is supported; the support method adopts at least one of the following: hydraulic support, single hydraulic support, downward pseudo-inclined segmented dense support, and adjustable flexible shielding support.

[0038] The scraperless coal mining method of the self-sliding coal seam wire rope traction miner provided by the present invention transforms ordinary machine mining and fully mechanized mining working faces into scraperless low-cost working faces, saving working face costs and enabling unmanned working faces during coal cutting; it transforms steeply inclined blasting working faces into machine mining working faces, realizing mechanized coal mining; for thin coal seams and extremely thin coal seams with supported working faces, when the coal seam roof is not broken, the support and scraper conveyor can be omitted, the working face is unmanned, the roof and floor plates are not broken, bent or closed, saving costs.

[0039] The present invention solves the defects of various existing self-sliding coal seam mining methods in terms of application and effect, such as low output and work efficiency, high excavation rate and pit wood consumption, high labor intensity, low recovery rate and many unsafe factors, etc., which improves the competitiveness of mines with self-sliding coal seams in the current market economy.

[0040] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A self-sliding coal seam wire rope traction mining machine scraper-free coal mining method, characterized in that: The following steps are involved: S1. Tunnel layout: excavate upper and lower tunnels in the coal seam; the upper tunnel is used for air return and is equipped with a self-propelled lifting equipment vehicle, and the lower tunnel is used for air intake and coal transportation; the area between the upper and lower tunnels is the working face; S2, coal cutting operation, the self-propelled lifting equipment group uses a wire rope to pull the mining machine along the working face to cut coal; S3. Support the working face after coal mining based on the thickness of the mined coal seam and the degree of fracture of the coal seam roof.

2. The scraperless coal mining method using a self-sliding coal seam wire rope traction mining machine according to claim 1 is characterized in that: The length of the working surface is 40 meters to 200 meters.

3. The scraperless coal mining method using a self-sliding coal seam wire rope traction miner according to claim 1 is characterized in that: The working surface is arranged in a positive inclination or a downward pseudo-inclination.

4. The scraperless coal mining method using a self-sliding coal seam wire rope traction miner according to claim 1 is characterized in that: The mining machine adopts double coaxial rollers, the axial directions of the two coaxial rollers of the mining machine are parallel to the coal wall of the working face, and the rocker arm of the mining machine is arranged between the two coaxial rollers.

5. The scraperless coal mining method using a self-sliding coal seam wire rope traction mining machine according to claim 4 is characterized in that: The included angle between the rocker arm and the working surface is 45°.

6. The scraperless coal mining method using a self-sliding coal seam wire rope traction mining machine according to claim 4 is characterized in that: The swing amplitude of the rocker arm of the mining machine is 5° to 15°.

7. The scraperless coal mining method using a self-sliding coal seam wire rope traction miner according to claim 1 is characterized in that: The self-propelled lifting equipment vehicle group is provided with a pulley group, and the steel wire rope, cable and water pipe connecting the self-propelled lifting equipment vehicle group and the mining machine are all wound around the pulley group.

8. The scraperless coal mining method using a self-sliding coal seam wire rope traction miner according to claim 1 is characterized in that: When the coal seam thickness is less than 1.3 meters and the coal seam roof is not broken, the working face after coal mining is not supported; when the coal seam thickness is less than 1.3 meters but the coal seam roof is broken and cannot be naturally bent and closed after mining, and the coal seam thickness is not less than 1.3 meters, the working face after coal mining is supported.

9. The scraperless coal mining method using a self-sliding coal seam wire rope traction mining machine according to claim 8, characterized in that: The support method adopts at least one of hydraulic support, single hydraulic support, downward pseudo-inclined segmented dense support, and adjustable flexible shielding support.

10. The scraperless coal mining method using a self-sliding coal seam wire rope traction mining machine according to claim 1, characterized in that: This coal mining method is suitable for self-sliding coal seams with an inclination of 40° to 90°.

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