CN114278295A - Layered mining method for gangue-containing coal seam of coal mine - Google Patents
Layered mining method for gangue-containing coal seam of coal mine Download PDFInfo
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- CN114278295A CN114278295A CN202111674960.2A CN202111674960A CN114278295A CN 114278295 A CN114278295 A CN 114278295A CN 202111674960 A CN202111674960 A CN 202111674960A CN 114278295 A CN114278295 A CN 114278295A
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- 239000003245 coal Substances 0.000 title claims abstract description 372
- 238000005065 mining Methods 0.000 title claims abstract description 288
- 238000000034 method Methods 0.000 title claims abstract description 73
- 238000005452 bending Methods 0.000 claims abstract description 27
- 230000008602 contraction Effects 0.000 claims description 6
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- 238000005422 blasting Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
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Abstract
The invention discloses a layered mining method of a coal mine gangue-containing coal bed, which comprises the following steps: controlling the coal mining machine to advance along the mining direction and obliquely cutting and feeding the coal wall to enable the cutting part to enter the upper coal seam and the lower coal seam respectively; controlling the cutting part to lift to a proper height so as to only cut coal in an upper coal bed and a lower coal bed, continuously advancing the coal mining machine until a preset position is reached, moving the scraper conveyor by a step distance towards the direction of the coal wall after the coal mining machine passes through the machine, adjusting a corresponding chute into a bending section, and controlling the hydraulic support to push the telescopic rod to support the top of the coal wall in time; controlling the coal mining machine to turn around and carry out mining so as to cut the previous gangue layer; and controlling the coal mining machine to continuously recover until the initial mining position is reached. Therefore, the coal and the gangue in the coal wall are cut and mined twice in sequence, the cutting resistance of the coal mining machine when the gangue clamping layer is cut is reduced, the failure rate is greatly reduced, and the use reliability of the equipment is improved; the coal and the gangue can be respectively transported away in sequence, and the separation efficiency can be improved.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a layered mining method for a gangue-containing coal seam of a coal mine.
Background
The layered mining is a mining method which is commonly used for ultra-thick coal seams. The underground mining coal seam thickness classification is generally divided into: the coal seam comprises a thin coal seam, a medium-thickness coal seam, a thick coal seam and an extra-thick coal seam, wherein the thickness of the thin coal seam is generally less than or equal to 1.3 m; the thickness of the medium-thickness coal seam is generally between 1.3 and 3.5 meters; the thickness of a thick coal seam is generally more than 3.5 meters; the thickness of an extra thick coal seam is a coal seam with a thickness of more than 8 meters.
At present, for a complex medium-thickness coal seam with a working face with a mining height range of 2.5-6.0 m and underground working conditions of an upper coal seam, a gangue layer and a lower coal seam in sequence from top to bottom and uniformly distributed middle gangue layer in the mining direction, two coal mining processes are generally adopted in domestic mines, the first coal mining process is a one-time full-height coal mining process, the second coal mining process is a blasting mining process for the gangue layer, and the other coal seams are full-height coal mining processes.
However, in practice, in the face of the above-mentioned complex medium-thick coal seams, both coal mining processes have the following disadvantages:
(1) when the coal mining process of one-time mining full height is used, the coal mining machine is subjected to large cutting resistance, the requirement on the performance of the whole machine of the coal mining machine is high, and even if the mechanical performance of the coal mining machine is improved, the roller and the rocker arm of the cutting part need to be maintained or even replaced due to the problems of abrasion and the like after the coal mining machine works for a period of time, the problems of high equipment maintenance cost, slow working face propelling speed and the like are easily caused.
(2) When the blasting mining process is used, although equipment can be protected to a certain degree, the safety is low, and underground safety accidents are easy to happen.
(3) After the coal cutting is finished once, the cut coal and the gangue are mixed together, and the subsequent separation work is greatly hindered.
Disclosure of Invention
In order to solve part or all technical problems in the prior art, the invention provides a layered mining method for a gangue-containing coal seam of a coal mine.
The technical scheme of the invention is as follows:
a layered mining method for a coal mine gangue-containing coal bed is used for mining a complex medium-thick coal bed with the underground working condition that an upper coal bed, a gangue-containing layer and a lower coal bed are sequentially arranged from top to bottom and the gangue-containing layer in the middle is more uniformly distributed in the mining direction, a coal mining machine used in the layered mining method is a transversely-movable coal mining machine, a telescopic oil cylinder is arranged between a rocker arm shell and a rocker arm bracket in the transversely-movable coal mining machine and can drive the rocker arm shell to telescopically move relative to the rocker arm bracket in the transverse direction, and the coal mining machine can move along the track direction pushed by a hydraulic bracket, and the layered mining method comprises the following steps:
s1: controlling the coal mining machine to advance along the mining direction and obliquely cut and feed the coal wall so that cutting parts at two ends of the coal mining machine respectively enter the upper coal seam and the lower coal seam to cut coal;
s2: controlling the cutting parts at both ends of the coal mining machine to respectively rise and fall to proper heights so that the cutting parts can only cut coal in the upper coal seam and the lower coal seam, and the coal mining machine continues to advance along the mining direction until the coal mining machine reaches a preset position, wherein after the coal mining machine passes through the machine, the hydraulic support pushing slip is operated to enable the scraper conveyor to move by one step distance towards the direction of the coal wall, the corresponding chute is adjusted to be a bent section, and the hydraulic support pushing and stretching rod is controlled to timely support the top of the coal wall;
s3: controlling the coal mining machine to turn around and recover along the direction opposite to the mining direction so as to cut the retained gangue layer before cutting;
s4: controlling the shearer to continue to mine the gangue dumping layer until the shearer reaches an initial mining position in the S1.
Optionally, the S1 includes: adjusting the positions of the rocker arm shells in advance to enable cutting parts at the front end and the rear end of the coal mining machine to be in a transverse contraction state, directly controlling the rocker arm shells at the front end and the rear end of the coal mining machine to extend towards the coal wall before the coal mining machine enters the coal wall from the initial mining position along the mining direction, enabling the cutting parts to completely enter the coal wall, controlling the coal mining machine to mine coal along the mining direction, controlling the cutting parts at the front end and the rear end to lift to clear the coal wall in the moving process of the coal mining machine, and controlling a hydraulic support pushing and stretching rod at the other side of the hydraulic support pushing and sliding to timely support the top of the coal wall after the coal mining machine passes through the machine.
Optionally, the S1 includes: adjusting the position of the rocker arm shell in advance to enable cutting parts at the front end and the rear end of the coal mining machine to be in a transverse contraction state, controlling the coal mining machine to enter a coal wall from the initial mining position along the mining direction, enabling the rocker arm shells at the front end and the rear end of the coal mining machine to extend towards the coal wall in the advancing process of the coal mining machine until the cutting parts completely enter the coal wall, wherein after the coal mining machine passes through the coal mining machine, a hydraulic support pushing and stretching rod at the other side of the hydraulic support pushing and sliding device timely supports the top of the coal wall.
Optionally, the S1 includes: adjusting the track direction of the hydraulic support pushing and sliding device in advance to enable the hydraulic support pushing and sliding device to approach a coal seam in the mining direction to form a beveling bending section, controlling the coal mining machine to enter the coal wall from the initial mining position along the mining direction, adjusting the heights of cutting parts at the front end and the rear end of the coal mining machine to enable the cutting parts to obliquely cut the coal along the mining direction until the cutting parts completely enter the coal wall, wherein after the coal mining machine passes through the machine, a hydraulic support pushing and stretching rod at the other side of the hydraulic support pushing and sliding device supports the top of the coal wall in time.
Optionally, the S1 further includes: and controlling a scraper conveyor and a hydraulic support to pull and push a frame and slide a step distance towards the coal wall at the beveling bending section, so that the scraper conveyor is flush with a hydraulic support chute on the front side in the mining direction, then controlling the coal mining machine to turn around and carry out stoping along the direction opposite to the mining direction so as to cut the residual coal bed in the coal wall, and controlling cutting parts at two ends of the coal mining machine to lift so as to cut the coal wall, wherein after the coal mining machine passes through the machine, a hydraulic support push-and-pull rod on the other side of the hydraulic support push-and-slide is used for timely supporting the top of the coal wall.
Optionally, the S1 further includes: and controlling the coal mining machine to advance along the mining direction in an idle state and reach the tail position of the previous beveling cutter, adjusting the heights of cutting parts at two ends of the coal mining machine, preparing to cut coal in the upper coal seam and the lower coal seam, and adjusting the state of the hydraulic support pushing slip in a beveling cutter feeding area after the coal mining machine passes through the machine, so that the hydraulic support pushing slip inclines towards the coal seam to form a stoping bending section, so as to prepare for a subsequent stoping process, wherein after the coal mining machine passes through the machine, a hydraulic support pushing and stretching rod at the other side of the hydraulic support pushing slip supports the top of the coal wall in time.
Optionally, the S3 includes: controlling the coal mining machine to turn around and recover along the direction opposite to the mining direction so as to cut the remaining gangue clamping layer, simultaneously controlling the rocker arm shell and the cutting part to push towards the mining empty side after reaching the bending section in the S2, completing rocker arm pushing by the coal mining machine after completely passing through the bending section in the S2, and enabling the cutting parts at the front end and the rear end to completely cut into the gangue clamping layer, wherein after the coal mining machine passes through the machine, a hydraulic support pushing and stretching rod at the other side of the hydraulic support pushing and sliding is used for pushing and stretching the top of the coal wall in time. (method 1 of step 5)
Optionally, the S3 includes: in S2, the shearer is directly operated at the predetermined position without moving the scraper conveyor by a step distance toward the coal wall or adjusting the chute to be a curved section, so as to push the shearer by a step distance toward the goaf side, and the cutting units at the front and rear ends are controlled to lift up and down to cut off the gangue and triangle coal at the current position, and then turn around to advance in the direction opposite to the mining direction until reaching the stoping curved section in S1, wherein after the shearer passes the shearer, the hydraulic support pushing and retracting rod at the other side of the hydraulic support pushing and retracting rod supports the top of the coal wall in time.
Optionally, the S4 includes: and when the coal mining machine reaches the stoping bending section in the S1, the coal mining machine continues to advance, the cutting part of the coal mining machine is controlled to be pushed towards the coal wall, after the coal mining machine completely passes through the stoping bending section, the rocker arm pushing of the coal mining machine is completed, the coal mining machine reaches the initial mining position in the S1, and a coal cutting step is completed, wherein after the coal mining machine passes through the machine, a hydraulic support pushing and stretching rod on the other side of the hydraulic support pushing and sliding is used for timely supporting the top of the coal wall.
The technical scheme of the invention has the following main advantages:
(1) the coal mining machine cuts the upper coal bed and the lower coal bed firstly, and then cuts the middle gangue clamping layer independently, at the moment, the gangue clamping layer has 3-direction degrees of freedom, the cutting resistance of the whole machine to the gangue clamping layer is reduced when the coal mining machine cuts, the failure rate of the coal mining machine is greatly reduced, and the use reliability of equipment can be improved;
(2) because the coal and the gangue in the coal wall are cut and mined twice in sequence, the coal cut firstly can be transported away in advance, the gangue cut later can be transported away later, the coal and the gangue can be respectively transported away in sequence, and the separation efficiency can be improved;
(3) in the mining method, the characteristic of transverse extension of the rocker arm of the coal mining machine can be utilized, the inclined cutting feed can be directly carried out, the process of reserving a bending section in advance by a scraper conveyor is omitted, the mining efficiency is improved, the processes of mining back, pushing and sliding and the like are omitted, the mining time is saved, and the mining efficiency is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a traversable shearer loader according to one embodiment of the present disclosure, wherein the rocker arm housing is in an extended state;
FIG. 2 is a schematic structural view of a traversable shearer loader according to one embodiment of the present disclosure, wherein the rocker arm housing is in a retracted state;
FIG. 3 is a schematic feed diagram of the first mode in step 1 of the layered mining method for the gangue in the coal mine according to one embodiment of the invention;
FIG. 4 is a schematic feed diagram of a second mode in step 1 of a method for stratified mining of a gangue layer in a coal mine according to one embodiment of the invention;
FIG. 5 is a schematic feed diagram of a third mode in step 1 of a method for stratified mining of a gangue layer in a coal mine according to one embodiment of the invention;
FIG. 6 is a schematic feed diagram of step 2 in a method for stratified mining of a coal mine seam with gangue according to an embodiment of the invention;
FIG. 7 is a schematic feed diagram of step 3 in a method for stratified mining of a coal mine seam with gangue according to an embodiment of the invention;
FIG. 8 is a schematic feed diagram of step 4 in a method of stratified mining a coal seam with gangue in a coal mine according to one embodiment of the invention;
FIG. 9 is a schematic representation of a first mode of feed for step 5 of a method of stratified mining a coal seam with gangue in a coal mine according to an embodiment of the present invention;
FIG. 10 is a schematic feed view of a second mode of step 5 in a method of stratified mining a coal seam in a coal mine according to an embodiment of the invention;
FIG. 11 is a schematic feed of step 6 in a method of stratified mining a coal seam with gangue in a coal mine according to an embodiment of the invention;
description of reference numerals:
1: the rocker arm housing 2: telescopic oil cylinder
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
When the underground working condition needs to be mined is that an upper coal seam, a gangue clamping layer and a lower coal seam are sequentially arranged from the top to the bottom, and the gangue clamping layer in the middle is distributed on a complex medium-thickness coal seam which is relatively uniform in the mining direction, the traditional mining process is difficult and the equipment damage rate is high due to the fact that the hardness of gangue clamping is high, the geological structure of the working face is complex, and the gangue clamping layer is extruded by the coal seam. According to one embodiment of the invention, a layered mining method of a coal mine gangue-containing coal bed is provided, which can be used for the complicated medium-thick coal bed, in the layered mining method, a coal mining machine firstly cuts two layers of coal, namely an upper layer and a lower layer, and then independently cuts a gangue-containing layer in the middle of a coal wall, when the gangue-containing layer is cut, the gangue-containing layer has 3-direction degrees of freedom, the internal stress is released, the cutting resistance of the whole machine subjected to the gangue-containing layer is reduced when the coal mining machine cuts, the failure rate of the coal mining machine is greatly reduced, and the use reliability of the equipment can be improved.
Specifically, as shown in fig. 1 and 2, the shearer loader used in the slice mining method according to the present embodiment is a traverse rocker arm shearer in which a telescopic cylinder 2 is provided between a rocker arm housing 1 and a rocker arm bracket, the telescopic cylinder 2 can drive the rocker arm housing 1 to move telescopically in a lateral direction with respect to the rocker arm bracket, and the shearer can move in a track direction along which a hydraulic mount is pushed.
The stratified mining method of the present embodiment includes:
s1: controlling the coal mining machine to advance along the mining direction and obliquely cutting and feeding the coal wall so that cutting parts at two ends of the coal mining machine respectively enter an upper coal seam and a lower coal seam to cut coal;
s1 may be regarded as step 1 of the stratified mining method, in step 1, the miter cut feed may take three modes, as shown in fig. 3, where the mining direction is from left to right, and the initial mining position is the leftmost end, and in the first mode, the method includes: the method comprises the steps of adjusting the positions of rocker arm shells in advance to enable cutting parts at the front end and the rear end of a coal mining machine to be in a transverse contraction state, directly controlling the rocker arm shells at the front end and the rear end of the coal mining machine to extend towards a coal wall before the coal mining machine enters the coal wall from an initial mining position along a mining direction, enabling the cutting parts to completely enter the coal wall, controlling the coal mining machine to mine coal along the mining direction, controlling the cutting parts at the front end and the rear end to lift to clean the coal wall in the moving process of the coal mining machine, and enabling a hydraulic support pushing and stretching rod located on the other side of the hydraulic support pushing and sliding to support the top of the coal wall in time after the coal mining machine passes through the machine.
As shown in fig. 4, the second mode includes: the method comprises the steps of adjusting the positions of rocker arm shells in advance to enable cutting parts at the front end and the rear end of the coal mining machine to be in a transverse contraction state, controlling the coal mining machine to enter a coal wall from an initial mining position along a mining direction, enabling the rocker arm shells at the front end and the rear end of the coal mining machine to extend towards the coal wall in the advancing process of the coal mining machine until the cutting parts completely enter the coal wall, and enabling a hydraulic support pushing and stretching rod at the other side of a hydraulic support pushing and sliding device to support the top of the coal wall in time after the coal mining machine passes through the machine.
As shown in fig. 5, the third mode includes: adjusting the track direction of the hydraulic support pushing slip in advance to enable the hydraulic support pushing slip to approach the coal bed in the mining direction to form a beveling bending section, controlling the coal mining machine to enter the coal wall from the initial mining position along the mining direction, adjusting the heights of cutting parts at the front end and the rear end of the coal mining machine to enable the cutting parts to obliquely cut the coal along the mining direction until the cutting parts completely enter the coal wall, wherein after the coal mining machine passes through the machine, a hydraulic support pushing telescopic rod at the other side of the hydraulic support pushing slip supports the top of the coal wall in time.
Further, as shown in fig. 6, the mining direction is a direction from right to left, and S1 further includes: and 2, controlling the scraper conveyor and the hydraulic support to pull and push the support towards the coal wall at the beveling bending section by a step distance so that the scraper conveyor is flush with a hydraulic support chute on the front side in the mining direction, then controlling the coal mining machine to turn around and carry out stoping along the direction opposite to the mining direction so as to cut the residual coal bed in the coal wall, and controlling the cutting parts at the two ends of the coal mining machine to lift so as to cut the coal wall clean, wherein after the coal mining machine passes through the machine, the hydraulic support push-telescopic rod on the other side of the hydraulic support push-slide supports the top of the coal wall in time.
As shown in fig. 7, S1 further includes: and 3, controlling the coal mining machine to advance along the mining direction in an idle cutter state and reach the tail position of the previous beveling cutter, adjusting the heights of cutting parts at two ends of the coal mining machine, preparing to cut coal in an upper coal seam and a lower coal seam, and adjusting the state of the hydraulic support pushing slip in the beveling cutter area after the coal mining machine passes through the machine, so that the hydraulic support pushing slip inclines towards the coal seam to form a stoping bending section, so as to prepare for a subsequent stoping process, wherein after the coal mining machine passes through the machine, the hydraulic support pushing and extending rod at the other side of the hydraulic support pushing slip supports the top of the coal wall in time.
Wherein the miter cut feed area refers to the area of travel of the shearer from no entry of the cutting section into the coal wall until fully into the coal wall.
As shown in fig. 8, the predetermined position is the rightmost end, and the stratified mining method according to the present embodiment further includes:
s2: controlling the cutting parts at the two ends of the coal mining machine to respectively rise and fall to proper heights so that the cutting parts can only cut coal in an upper coal seam and a lower coal seam, and continuing to advance along the mining direction until the coal mining machine reaches a preset position, wherein after the coal mining machine passes through the machine, the hydraulic support is operated to push the scraper conveyor to move one step distance towards the direction of the coal wall, the corresponding chute is adjusted to be a bending section, and the hydraulic support is controlled to push the telescopic rod to timely support the top of the coal wall;
s2 may be regarded as step 4 of the stratified mining method.
S3: controlling the coal mining machine to turn around and carry out mining along the direction opposite to the mining direction so as to cut the retained gangue layer before cutting;
the step S3 can be regarded as step 5 of the layered mining method, and in the step 5, when mining the gangue layer in the middle of the cutting, two ways can be adopted.
As shown in fig. 9, the first mode of step 5 includes: controlling the coal mining machine to turn around and recover along the direction opposite to the mining direction so as to cut the remaining gangue layer, simultaneously, after reaching the bending section in S2, controlling the rocker arm shell and the cutting part to push towards the mining empty side along the direction opposite to the mining direction, and after completely passing through the bending section in S2, completing the pushing of the rocker arm by the coal mining machine, and enabling the cutting parts at the front end and the rear end to completely cut into the gangue layer, wherein after the coal mining machine passes through the machine, the hydraulic support pushing and extending rod at the other side of the hydraulic support pushing and sliding is used for timely supporting the top of the coal wall.
As shown in fig. 10, the second mode of step S3 includes: in S2, the scraper conveyor is not moved by a step distance towards the direction of the coal wall, the corresponding chute is not adjusted to be a bending section, the coal mining machine is directly operated at a preset position to push the scraper conveyor to a mining side by a step distance, the cutting parts at the front end and the rear end are controlled to lift up and down to cut off the gangue and the triangular coal at the current position, then the coal mining machine turns around in the direction opposite to the mining direction until the coal mining machine reaches the stoping bending section in S1, and after the coal mining machine passes through the machine, the hydraulic support pushing and stretching rod at the other side of the hydraulic support pushing and sliding is used for timely supporting the top of the coal wall.
Further, the stratified mining method of the present embodiment further includes:
s4: the shearer is controlled to continue to mine the interbedded layer until the shearer reaches the initial mining position in S1.
Specifically, as shown in fig. 11, S4 includes: and 6, when the coal mining machine reaches the stoping bending section in the S1, the coal mining machine continues to advance, the cutting part of the coal mining machine is controlled to be pushed towards the coal wall, after the coal mining machine completely passes through the stoping bending section, the rocker arm of the coal mining machine is pushed, the coal mining machine reaches the initial mining position in the S1, and a coal cutting step is completed, wherein after the coal mining machine passes through the machine, the hydraulic support pushing and stretching rod on the other side of the hydraulic support pushing and sliding is used for timely supporting the top of the coal wall.
As can be seen, the stratified mining method in the present embodiment has the following advantages:
(1) the coal mining machine cuts the upper coal bed and the lower coal bed firstly, and then cuts the middle gangue clamping layer independently, at the moment, the gangue clamping layer has 3-direction degrees of freedom, the cutting resistance of the whole machine to the gangue clamping layer is reduced when the coal mining machine cuts, the failure rate of the coal mining machine is greatly reduced, and the use reliability of equipment can be improved;
(2) because the coal and the gangue in the coal wall are cut and mined twice in sequence, the coal cut firstly can be transported away in advance, the gangue cut later can be transported away later, the coal and the gangue can be respectively transported away in sequence, and the separation efficiency can be improved;
(3) in the mining method, the characteristic of transverse extension of the rocker arm of the coal mining machine can be utilized, the inclined cutting feed can be directly carried out, the process of reserving a bending section in advance by a scraper conveyor is omitted, the mining efficiency is improved, the processes of mining back, pushing and sliding and the like are omitted, the mining time is saved, and the mining efficiency is improved.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A layered mining method for a coal mine gangue-containing coal bed is characterized in that the layered mining method is used for mining a complex medium-thickness coal bed under the working condition that an upper coal bed, a gangue-containing layer and a lower coal bed are sequentially arranged from top to bottom and the gangue-containing layer in the middle is uniformly distributed in the mining direction, a coal mining machine used in the layered mining method is a transversely-movable rocker arm type coal mining machine, a telescopic oil cylinder is arranged between a rocker arm shell and a rocker arm bracket and can drive the rocker arm shell to telescopically move in the transverse direction relative to the rocker arm bracket, and the coal mining machine can move in the track direction of pushing sliding of a hydraulic bracket, and the layered mining method comprises the following steps:
s1: controlling the coal mining machine to advance along the mining direction and obliquely cut and feed the coal wall so that cutting parts at two ends of the coal mining machine respectively enter the upper coal seam and the lower coal seam to cut coal;
s2: controlling the cutting parts at both ends of the coal mining machine to respectively rise and fall to proper heights so that the cutting parts can only cut coal in the upper coal seam and the lower coal seam, and the coal mining machine continues to advance along the mining direction until the coal mining machine reaches a preset position, wherein after the coal mining machine passes through the machine, the hydraulic support pushing slip is operated to enable the scraper conveyor to move by one step distance towards the direction of the coal wall, the corresponding chute is adjusted to be a bent section, and the hydraulic support pushing and stretching rod is controlled to timely support the top of the coal wall;
s3: controlling the coal mining machine to turn around and recover along the direction opposite to the mining direction so as to cut the retained gangue layer before cutting;
s4: controlling the shearer to continue to mine the gangue dumping layer until the shearer reaches an initial mining position in the S1.
2. The method for stratified mining of a coal mine gangue seam as claimed in claim 1, wherein said S1 includes: adjusting the positions of the rocker arm shells in advance to enable cutting parts at the front end and the rear end of the coal mining machine to be in a transverse contraction state, directly controlling the rocker arm shells at the front end and the rear end of the coal mining machine to extend towards the coal wall before the coal mining machine enters the coal wall from the initial mining position along the mining direction, enabling the cutting parts to completely enter the coal wall, controlling the coal mining machine to mine coal along the mining direction, controlling the cutting parts at the front end and the rear end to lift to clear the coal wall in the moving process of the coal mining machine, and controlling a hydraulic support pushing and stretching rod at the other side of the hydraulic support pushing and sliding to timely support the top of the coal wall after the coal mining machine passes through the machine.
3. The method for stratified mining of a coal mine gangue seam as claimed in claim 1, wherein said S1 includes: adjusting the position of the rocker arm shell in advance to enable cutting parts at the front end and the rear end of the coal mining machine to be in a transverse contraction state, controlling the coal mining machine to enter a coal wall from the initial mining position along the mining direction, enabling the rocker arm shells at the front end and the rear end of the coal mining machine to extend towards the coal wall in the advancing process of the coal mining machine until the cutting parts completely enter the coal wall, wherein after the coal mining machine passes through the coal mining machine, a hydraulic support pushing and stretching rod at the other side of the hydraulic support pushing and sliding device timely supports the top of the coal wall.
4. The method for stratified mining of a coal mine gangue seam as claimed in claim 1, wherein said S1 includes: adjusting the track direction of the hydraulic support pushing and sliding device in advance to enable the hydraulic support pushing and sliding device to approach a coal seam in the mining direction to form a beveling bending section, controlling the coal mining machine to enter the coal wall from the initial mining position along the mining direction, adjusting the heights of cutting parts at the front end and the rear end of the coal mining machine to enable the cutting parts to obliquely cut the coal along the mining direction until the cutting parts completely enter the coal wall, wherein after the coal mining machine passes through the machine, a hydraulic support pushing and stretching rod at the other side of the hydraulic support pushing and sliding device supports the top of the coal wall in time.
5. The method for stratified mining of a coal mine gangue seam as claimed in claim 4, wherein said S1 further comprises: and controlling a scraper conveyor and a hydraulic support to pull and push a frame and slide a step distance towards the coal wall at the beveling bending section, so that the scraper conveyor is flush with a hydraulic support chute on the front side in the mining direction, then controlling the coal mining machine to turn around and carry out stoping along the direction opposite to the mining direction so as to cut the residual coal bed in the coal wall, and controlling cutting parts at two ends of the coal mining machine to lift so as to cut the coal wall, wherein after the coal mining machine passes through the machine, a hydraulic support push-and-pull rod on the other side of the hydraulic support push-and-slide is used for timely supporting the top of the coal wall.
6. The method for stratified mining of a coal mine gangue seam as claimed in claim 5, wherein said S1 further comprises: and controlling the coal mining machine to advance along the mining direction in an idle state and reach the tail position of the previous beveling cutter, adjusting the heights of cutting parts at two ends of the coal mining machine, preparing to cut coal in the upper coal seam and the lower coal seam, and adjusting the state of the hydraulic support pushing slip in a beveling cutter feeding area after the coal mining machine passes through the machine, so that the hydraulic support pushing slip inclines towards the coal seam to form a stoping bending section, so as to prepare for a subsequent stoping process, wherein after the coal mining machine passes through the machine, a hydraulic support pushing and stretching rod at the other side of the hydraulic support pushing slip supports the top of the coal wall in time.
7. The method for stratified mining of a coal mine gangue seam as claimed in claim 6, wherein said S3 includes: controlling the coal mining machine to turn around and recover along the direction opposite to the mining direction so as to cut the remaining gangue clamping layer, simultaneously controlling the rocker arm shell and the cutting part to push towards the mining empty side after reaching the bending section in the S2, completing rocker arm pushing by the coal mining machine after completely passing through the bending section in the S2, and enabling the cutting parts at the front end and the rear end to completely cut into the gangue clamping layer, wherein after the coal mining machine passes through the machine, a hydraulic support pushing and stretching rod at the other side of the hydraulic support pushing and sliding is used for pushing and stretching the top of the coal wall in time.
8. The method for stratified mining of a coal mine gangue seam as claimed in claim 6, wherein said S3 includes: in S2, the shearer is directly operated at the predetermined position without moving the scraper conveyor by a step distance toward the coal wall or adjusting the chute to be a curved section, so as to push the shearer by a step distance toward the goaf side, and the cutting units at the front and rear ends are controlled to lift up and down to cut off the gangue and triangle coal at the current position, and then turn around to advance in the direction opposite to the mining direction until reaching the stoping curved section in S1, wherein after the shearer passes the shearer, the hydraulic support pushing and retracting rod at the other side of the hydraulic support pushing and retracting rod supports the top of the coal wall in time.
9. The method for stratified mining of a coal mine gangue seam as claimed in claim 7, wherein said S4 includes: and when the coal mining machine reaches the stoping bending section in the S1, the coal mining machine continues to advance, the cutting part of the coal mining machine is controlled to be pushed towards the coal wall, after the coal mining machine completely passes through the stoping bending section, the rocker arm pushing of the coal mining machine is completed, the coal mining machine reaches the initial mining position in the S1, and a coal cutting step is completed, wherein after the coal mining machine passes through the machine, a hydraulic support pushing and stretching rod on the other side of the hydraulic support pushing and sliding is used for timely supporting the top of the coal wall.
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