Method for mining single coal outlet in ultra-long working surface

Abstract

A method for mining a single coal outlet in an ultra-long working surface comprises: disposing a scraper conveyor on a working surface and arranging two shearers at the two ends; the two shearers synchronously cutting notches in directions towards a middle portion of the working surface, obliquely inserting blades, and starting a normal mining operation; when the two shearers reach the middle portion of the ultra-long working surface, either one of the two shearers starting to operate in the reverse direction, while the other shearer does not change the direction of operation and performs a cutting and mining operation at a middle position of the working surface; and after the other shearer completes the cutting and mining operation at the middle position, starting to operate in the reverse direction. The steps above are a working cycle, and a plurality of working cycles are performed in sequence to complete mining work on the ultra-long working surface.

Description

A single coal outlet mining method for an ultra-long working face

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023108277702 filed in China on July 6, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the technical field of coal mining, and in particular to a single-coal outlet mining method for an ultra-long working face. Background Art

[0004] In coal mining, a reasonable working face length is crucial for achieving high production and efficiency. The length of a fully mechanized coal mining face depends on many factors. Theoretically, when unconstrained by geological conditions, ventilation and safety requirements, and the level of supporting equipment, the working face length is directly proportional to the face's unit output and production efficiency. Under the same geological conditions, the length of a fully mechanized coal mining face is primarily determined by the degree of mine pressure, roof control technology, mining techniques, and equipment level.

[0005] Among the working face mining methods currently used in coal mines, the mining efficiency of ultra-long working faces still has considerable room for improvement. In the implementation of ultra-long working face mining methods, increasing the working face length can reduce coal pillar loss, lower tunneling rates, and increase coal recovery rates. This is one of the effective ways to increase working face production, improve mining efficiency, and reduce coal losses.

[0006] To reduce the number of underground workers and ensure safe mine production, the State Administration of Work Safety has implemented a "one mine (well) one face" and "one mine (well) two faces" production model. As the number of working faces in mines decreases, increasing the length of working faces is the most effective way to increase mine production. Therefore, the applicant believes it is necessary to develop a single-coal outlet mining method for ultra-long working faces to improve mining efficiency in these faces.

[0007] Summary of the Invention

[0008] The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.

[0009] To achieve the above objectives, the present disclosure provides a method for mining a coal with a single coal outlet in an ultra-long working face, comprising the following steps:

[0010] S1. Arrange a scraper and a first shearer and a second shearer on the working face, with the initial working positions of the two shearers being located at the left and right ends of the working face respectively;

[0011] S2. Control the two shearers located at the left and right ends of the working face to synchronously open a notch and cut obliquely toward the middle of the working face, and begin normal mining operations on the extra-long working face until the two shearers reach the middle of the extra-long working face;

[0012] S3. When the two shearers reach the middle of the extra-long mining face, one of the two shearers begins to run in the reverse direction and begins to perform normal cutting and mining operations on the portion of the working face it has cut, while the other shearer continues to run in the same direction and performs cutting and mining operations on the middle portion of the extra-long working face.

[0013] S4. After the shearer mining the middle portion of the extra-long working face completes the cutting and mining operation at the middle portion, it begins to reverse and move toward its initial working position at the end of the extra-long working face, and begins normal cutting and mining operations on the working face it has mined.

[0014] Steps S5 and S1-S4 constitute a working cycle, and multiple working cycles are performed in sequence to complete the mining work of the super-long working face.

[0015] The embodiment of the present disclosure divides the working face into two half-areas on the left and right by setting up a scraper conveyor and two coal mining machines on an extra-long working face. The two coal mining machines can be responsible for the cutting and mining operations of their respective half-areas of the working face, and in each adjacent working cycle, the two coal mining machines realize alternating cutting and mining of the middle position of the working face. The mined coal blocks will be transported out from the same scraper conveyor and the same exit, thereby completing the mining of the extra-long working face.

[0016] In some embodiments, the step S2 specifically includes the following steps:

[0017] S21. Two coal shearers cut into the coal face at an angle from both ends of the extra-long working face, forming triangular coal areas at both ends of the extra-long working face.

[0018] S22, controlling the two coal mining machines to run in opposite directions, thereby completing mining of the triangular coal areas at both ends of the extra-long working face;

[0019] S23. After completing the mining of the triangular coal area, the two coal mining machines changed their mining direction and resumed mining towards the middle of the super-long working face.

[0020] In some embodiments, in S3, when the first coal shearer runs in the reverse direction, the first coal shearer cuts obliquely in the direction of its movement to form a first central triangular coal area in the middle of the working face, and directly starts to move in the reverse direction after completing the oblique cutting to perform normal mining operations;

[0021] When the second shearer starts to run in the reverse direction of the first shearer, it maintains its original direction of running towards the middle of the extra-long mining face and continues to mine until it reaches the oblique cutting position of the first shearer. After completing the cutting in the middle of the working face, the second shearer starts to run in the reverse direction, cutting obliquely from the middle of the working face, forming a second central triangular coal area in the middle of the working face;

[0022] After the second coal mining machine completes the reverse oblique cutting, it resumes its movement toward the middle of the working face and mines the second middle triangular coal area until it reaches the first middle triangular coal area and stops mining. After completion, the second coal mining machine reverses again, and after running with an empty knife to the oblique cutting position in the middle of the working face, it performs normal cutting and mining operations on the working face until it reaches its initial working position at the end of the working face.

[0023] When the second coal mining machine mines to the first middle triangular area and runs in the opposite direction again, the first coal mining machine changes its running direction at the same time and moves with an empty knife toward the middle of the working face to the first middle triangular area, and begins to cut the middle first triangular area and cut through the coal body in the first middle triangular area. After that, the first coal mining machine changes its running direction and moves toward its initial working position at the end of the working face. After running with an empty knife for a distance, it performs normal cutting and mining operations on the working face.

[0024] In some embodiments, the first coal mining machine and the second coal mining machine perform cutting and mining operations on the middle position of the working face alternately in any adjacent working cycles, and the two coal mining machines perform each other's mining action processes in different mining working cycles.

[0025] In some embodiments, when the first coal mining machine completes the oblique cutting in the middle of the working face, the second coal mining machine completes the mining and cutting operation in the middle of the working face.

[0026] In some embodiments, when the two coal shearers are running toward the ends of the extra-long working face to perform coal mining operations, the two coal shearers respectively and simultaneously reach the initial working positions at the two ends of the extra-long working face.

[0027] In some embodiments, to ensure that the two shearers can reach their respective initial working positions at the same time, the working face length is L, and the average cutting speed of the shearer is V. g , the reverse idle time of the middle part of the first shearer is T k2 The time for the first shearer to cut the reverse triangular coal in the middle is T s , the idle time of the first shearer is T k3 , end bevel cutting time T x The time for the shearer to return and cut the triangular coal is T h , the first coal mining machine end operation time is T dtz , the second shearer end operation time is T dtyIn order to ensure the coordinated mining of the two shearers, the mining length of the first shearer is L m1 , the mining length of the second coal mining machine is L m2 , when only the second coal mining machine is cutting and mining the middle part of the working face, L m1 and L m2 The length should meet certain conditions:

[0028] L m1 =[LV g (T k2 +T s +T k3 -T x -T h +T tdz -T tdy )] / 2;

[0029] L m2 =[L+V g (T k2 +T s +T k3 -T x -T h +T tdz -T tdy )] / 2;

[0030] And L m1 <L m2 .

[0031] In some embodiments, when only the second shearer is cutting and mining the middle part of the working face, the working face length L is recorded, and the first shearer is mining half of the face length L. m1 , the length of the mining area of ​​the second shearer is L m2 , roller center distance L1, scraper conveyor bending section length L2, coal mining machine bevel cutting progress speed V x , coal mining machine cutting speed V g , coal mining machine dispatching speed V d , then the running time of the first coal mining machine that reaches the middle of the working face and runs in the reverse direction is T z and the second shearer operating time T for cutting and mining in the middle of the working face y The calculation process is as follows:

[0032] The first shearer mining time T z The following conditions must be met:

[0033] End bevel cutting time: T x =(L1+L2) / V x ;

[0034] Time for the end to return to cut the triangular coal: T h =(L1+L2) / Vh ;

[0035] End empty knife return time: T d =(L1+L2) / V d ;

[0036] Time for cutting coal to the right: T zg1 =[L m1 -(L1+L2)] / V g ;

[0037] Middle drive oblique cutting feed time: T x =(L1+L2) / V x ;

[0038] Time for mid-drive return to cut triangular coal: T h =(L1+L2) / V h ;

[0039] First shearer first empty cut time: T k1 =(L1+L2) / V d ;

[0040] Second coal mining machine middle drive oblique cutting time: T x =(L1+L2) / V x ;

[0041] Time for the second shearer to return to cut the triangular coal: T h =(L1+L2) / V h ;

[0042] The first shearer's reverse idle cut time: T k2 =(L1+T x V g +T h V g ) / V d ;

[0043] Time of reverse triangular coal of the first shearer: T s =L2 / V x ;

[0044] First shearer idle time: T k3 =(L1+L2+T x V g +T h V g ) / V d

[0045] Time for cutting coal to the left: T zg2 =[L m1 -(L1+L2+T x V g +Th V g )] / V g ;

[0046] Operation time of the first shearer mining half area end: T dtz ;

[0047] First shearer mining half area shearer operation time: T z =2T x +2T h +T d +T k1 +T k2 +T s +T k3 +T zg1 +T zg2 +T dtz ;

[0048] The second shearer mining time T y The following conditions need to be met:

[0049] End bevel cutting time: T x =(L1+L2) / V x ;

[0050] Time for the end to return to cut the triangular coal: T h =(L1+L2) / V h ;

[0051] End empty knife return time: T d =(L1+L2) / V d ;

[0052] Time for cutting coal to the left: T yg1 =[L m2 -(L1+L2)] / V g ;

[0053] Right coal machine middle drive oblique cutting feed time: T x =(L1+L2) / V x ;

[0054] Time for right coal machine to return to cut triangular coal: T h =(L1+L2) / V h ;

[0055] Right coal machine reverse idle knife time: T d =(L1+L2) / V d ;

[0056] Time for cutting coal to the right: T yg2 =[L m2 -(L1+L2)] / V g ;

[0057] Right half end operation time: T dty

[0058] Coal mining machine operation time in the right half: T y =2T x +2T h +2T d +T yg1 +T yg2 +T dty ;

[0059] And it is necessary to ensure T z =T y .

[0060] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0062] FIG1 is a schematic diagram of the overall method steps of a single coal outlet mining method for an ultra-long working face according to an embodiment of the present disclosure;

[0063] FIG2 is a schematic diagram showing the detailed steps of step S2 of a single coal outlet mining method for an ultra-long working face according to an embodiment of the present disclosure;

[0064] FIG3 is a schematic diagram of the synchronous self-notching process of the shearer in the left and right half areas of the working face according to an embodiment of the present disclosure in a method for mining a super-long working face with a single coal outlet;

[0065] FIG4 is a schematic diagram of the synchronous oblique cutting process of the shearer in the left and right half areas of the working face according to an embodiment of the present disclosure in a method for mining a super-long working face with a single coal outlet;

[0066] 5 is a schematic diagram of the process of reversely cutting the left and right end triangular coals by the shearer in the left and right half areas of the working face in a method for mining a super-long working face with a single coal outlet according to an embodiment of the present disclosure;

[0067] FIG6 is a schematic diagram of the triangular coal emptying process of the shearer in the left and right half areas of the working face according to an embodiment of the present disclosure in a method for mining a super-long working face with a single coal outlet;

[0068] FIG7 is a schematic diagram of a first coal mining machine cutting-in-place process of a super-long working face single coal outlet mining method according to an embodiment of the present disclosure;

[0069] FIG8 is a schematic diagram of the process of the first coal mining machine obliquely cutting in the middle of the working face in a method for mining with a single coal outlet in an ultra-long working face according to an embodiment of the present disclosure;

[0070] FIG9 is a schematic diagram of a reverse cutting process of a first shearer in a single-coal outlet mining method for an ultra-long working face according to an embodiment of the present disclosure;

[0071] FIG10 is a schematic diagram of a process in which a first shearer cuts empty and a second shearer is brought into position in a single-coal outlet mining method for an ultra-long working face according to an embodiment of the present disclosure;

[0072] FIG11 is a schematic diagram of the first shearer cutting and the second shearer middle oblique cutting process of a single coal outlet mining method for an ultra-long working face according to an embodiment of the present disclosure;

[0073] FIG12 is a schematic diagram of a process of reversely cutting through the second middle triangular coal by a second coal mining machine in an ultra-long working face single coal outlet mining method according to an embodiment of the present disclosure;

[0074] 13 is a schematic diagram of a process in which a first shearer moves forward with an empty cutter and a second shearer moves backward with an empty cutter in a method for mining a single coal outlet in an ultra-long working face according to an embodiment of the present disclosure;

[0075] FIG14 is a schematic diagram of the first shearer reversely cutting through the first middle triangular coal and the second shearer cutting process of a single coal outlet mining method for an ultra-long working face according to an embodiment of the present disclosure;

[0076] FIG15 is a schematic diagram of a reverse movement and cutting process of a right shearer in a single coal outlet mining method for an ultra-long working face according to an embodiment of the present disclosure;

[0077] FIG16 is a schematic diagram of the reverse normal cutting process of the first and second coal mining machines in an ultra-long working face single coal outlet mining method according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0078] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0079] An embodiment of the present disclosure provides a single-coal outlet mining method for an ultra-long working face, which is described in detail below with reference to Figures 1 to 16.

[0080] A single coal outlet mining method for an ultra-long working face comprises the following steps:

[0081] S1. Arrange a scraper and a first and second shearers on the working face. The two shearers are initially positioned at the left and right ends of the working face, dividing the working face into a left and a right half. The first shearer is initially positioned at the left end of the working face and is responsible for cutting and mining operations in the left half of the working face. The second shearer is initially positioned at the right end of the working face and is responsible for cutting and mining operations in the right half of the working face.

[0082] S2. Control the two shearers located at the left and right ends of the working face to synchronously open a notch and cut obliquely toward the middle of the working face, and begin normal mining operations on the extra-long working face until the two shearers reach the middle of the extra-long working face;

[0083] S3. When the two shearers reach the middle of the extra-long mining face, one of the two shearers begins to run in the reverse direction and begins to perform normal cutting and mining operations on the portion of the working face it has cut, while the other shearer continues to run in the same direction and performs cutting and mining operations on the middle portion of the extra-long working face.

[0084] S4. After the shearer mining the middle portion of the extra-long working face completes the cutting and mining operation at the middle portion, it begins to reverse and move toward its initial working position at the end of the extra-long working face, and begins normal cutting and mining operations on the working face it has mined.

[0085] Steps S5 and S1-S4 constitute a working cycle, and multiple working cycles are performed in sequence to complete the mining work of the super-long working face.

[0086] The embodiment of the present disclosure divides the working face into two half-areas on the left and right by setting up a scraper conveyor and two coal mining machines on an extra-long working face. The two coal mining machines can be responsible for the cutting and mining operations of their respective half-areas of the working face, and in each adjacent working cycle, the two coal mining machines realize alternating cutting and mining of the middle position of the working face. The mined coal blocks will be transported out from the same scraper conveyor and the same exit, thereby completing the mining of the extra-long working face.

[0087] Among them, in S2, the following steps are specifically included:

[0088] S21. Two coal shearers cut into the coal face at an angle from both ends of the extra-long working face, forming triangular coal areas at both ends of the extra-long working face.

[0089] S22, controlling the two coal mining machines to run in opposite directions, thereby completing mining of the triangular coal areas at both ends of the extra-long working face;

[0090] S23. After completing the mining of the triangular coal area, the two coal mining machines changed their mining direction and resumed mining towards the middle of the super-long working face.

[0091] After completing the normal cutting and mining operation toward the center of the working face, step S3 begins. In S3, when the first shearer is running in the reverse direction, the first shearer cuts obliquely in its direction of movement, forming a first central triangular coal area in the middle of the working face. After completing the oblique cutting, the first shearer immediately starts moving in the reverse direction to perform normal mining operations.

[0092] When the second shearer starts to run in the reverse direction of the first shearer, it maintains its original direction of running towards the middle of the extra-long mining face and continues to mine until it reaches the oblique cutting position of the first shearer. After completing the cutting in the middle of the working face, the second shearer starts to run in the reverse direction, cutting obliquely from the middle of the working face, forming a second central triangular coal area in the middle of the working face;

[0093] After the second coal mining machine completes the reverse oblique cutting, it resumes its movement toward the middle of the working face and mines the second middle triangular coal area until it reaches the first middle triangular coal area and stops mining. After completion, the second coal mining machine reverses again, and after running with an empty knife to the oblique cutting position in the middle of the working face, it performs normal cutting and mining operations on the working face until it reaches its initial working position at the end of the working face.

[0094] When the first shearer completes the oblique cutting in the middle of the working face, the second shearer completes the mining and cutting operation in the middle of the working face;

[0095] When the second coal mining machine mines to the first middle triangular area and runs in the opposite direction again, the first coal mining machine changes its running direction at the same time and moves with an empty knife toward the middle of the working face to the first middle triangular area, and begins to cut the middle first triangular area and cut through the coal body in the first middle triangular area. After that, the first coal mining machine changes its running direction and moves toward its initial working position at the end of the working face. After running with an empty knife for a distance, it performs normal cutting and mining operations on the working face.

[0096] In some embodiments, within any adjacent working cycles, the first and second shearers alternately perform cutting and mining operations in the middle of the working face. The two shearers perform each other's mining operations in different mining working cycles. This allows the two shearers to alternately cut and mine the middle of the working face. This results in similar wear and tear between the two shearers, avoiding the excessive wear that can occur when a single shearer mines the middle of the working face.

[0097] The first coal shearer and the second coal shearer cooperate in mining operations, which requires that when the two coal shearers are running toward the end of the extra-long working face to perform coal mining operations, the two coal shearers reach the initial working positions at the two ends of the extra-long working face respectively and simultaneously.

[0098] To ensure that the two shearers can reach their respective initial working positions at the same time when they move towards their initial working positions at both ends of the working face, the length of the working face is L, and the average cutting speed of the shearer is V. g , the reverse idle time of the middle part of the first shearer is T k2 The time for the first shearer to cut the reverse triangular coal in the middle is T s , the idle time of the first shearer is T k3 , end bevel cutting time T x The time for the shearer to return and cut the triangular coal is T h , the first coal mining machine end operation time is T dtz , the second shearer end operation time is T dty In order to ensure the coordinated mining of the two shearers, the mining length of the first shearer is L m1 , the mining length of the second shearer is L m2 , when only the second coal mining machine is cutting and mining the middle part of the working face, L m1 and L m2 The length should meet certain conditions:

[0099] L m1 =[LV g (T k2 +T s +T k3 -T x -T h +T tdz -T tdy )] / twenty one)

[0100] L m2 =[L+V g (T k2 +T s +T k3 -T x -T h +T tdz -T tdy )] / twenty two)

[0101] And it is necessary to ensure L m1 <L m2 , and L m2 -L m1 =V g (T k2 +T s +T k3 -T x -T h +T tdz -T tdy). That is, when the second shearer is cutting and mining the middle of the working face, the mining length of the first shearer is less than the mining length of the second shearer. In the next working cycle, when the first shearer is mining the middle of the working face, the mining length of the first shearer needs to be greater than the mining length of the second shearer in this working cycle.

[0102] In some embodiments, the mining time of the two shearers is determined. When only the second shearer is cutting and mining the middle part of the working face, the working face length L is recorded, and the first shearer is mining the half-area face length L. m1 , the length of the mining area of ​​the second shearer is L m2 , roller center distance L1, scraper conveyor bending section length L2, coal mining machine bevel cutting progress speed V x , coal mining machine cutting speed V g , coal mining machine dispatching speed V d , then the running time of the first coal mining machine that reaches the middle of the working face and runs in the reverse direction is T z and the second shearer operating time T for cutting and mining in the middle of the working face y The calculation process is as follows:

[0103] The first shearer mining time T z The following conditions must be met:

[0104] End bevel cutting time: T x =(L1+L2) / V x ;

[0105] Time for the end to return to cut the triangular coal: T h =(L1+L2) / V h ;

[0106] End empty knife return time: T d =(L1+L2) / V d ;

[0107] Time for cutting coal to the right: T zg1 =[L m1 -(L1+L2)] / V g ;

[0108] Mid-drive oblique cutting feed time: T x =(L1+L2) / V x ;

[0109] Time for mid-drive return to cut triangular coal: T h =(L1+L2) / V h ;

[0110] First shearer first empty cut time: T k1 =(L1+L2) / V d ;

[0111] Second coal mining machine middle drive oblique cutting time: T x =(L1+L2) / V x ;

[0112] Time for the second shearer to return to cut the triangular coal: T h =(L1+L2) / V h ;

[0113] The first shearer's reverse idle cut time: T k2 =(L1+T x V g +T h V g ) / V d ;

[0114] Time of reverse triangular coal of the first shearer: T s =L2 / V x ;

[0115] First shearer idle time: T k3 =(L1+L2+T x V g +T h V g ) / V d

[0116] Time for cutting coal to the left: T zg2 =[L m1 -(L1+L2+T x V g +T h V g )] / V g ;

[0117] Operation time of the first shearer mining half area end: T dtz ;

[0118] First shearer mining half area shearer operation time: T z =2T x +2T h +T d +T k1 +T k2 +T s +T k3 +T zg1 +T zg2 +T dtz ;

[0119] The second shearer mining time T y The following conditions need to be met:

[0120] End bevel cutting time: Tx =(L1+L2) / V x ;

[0121] Time for the end to return to cut the triangular coal: T h =(L1+L2) / V h ;

[0122] End empty knife return time: T d =(L1+L2) / V d ;

[0123] Time for cutting coal to the left: T yg1 =[L m2 -(L1+L2)] / V g ;

[0124] Right coal machine middle drive oblique cutting feed time: T x =(L1+L2) / V x ;

[0125] Time for right coal machine to return to cut triangular coal: T h =(L1+L2) / V h ;

[0126] Right coal machine reverse idle knife time: T d =(L1+L2) / V d ;

[0127] Time for cutting coal to the right: T yg2 =[L m2 -(L1+L2)] / V g ;

[0128] Right half end operation time: T dty

[0129] Coal mining machine operation time in the right half: T y =2T x +2T h +2T d +T yg1 +T yg2 +T dty ;

[0130] And it is necessary to ensure T z =T y .

[0131] When T z =T y， That is, T k1 +T k2 +T s +T k3 +T zg1 +T zg2 +Tdtz =T d +T yg1 +T yg2 +T dty

[0132] Solving the above equations (1) and (2) yields:

[0133] L m1 =[LV g (T k2 +T s +T k3 -T x -T h +T tdz -T tdy )] / twenty one)

[0134] L m2 =[L+V g (T k2 +T s +T k3 -T x -T h +T tdz -T tdy )] / twenty two)

[0135] Since the working time of the left and right half areas is equal, the working time of the right half area is the working time of the whole working area. z =T y .

[0136] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0137] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0138] Although the embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for mining a coal from a single coal outlet in an ultra-long working face, comprising the following steps: S1. Arrange a scraper and a first coal mining machine and a second coal mining machine on the working face, and the initial working positions of the two coal mining machines are located at the left and right ends of the working face respectively; S2, control the two coal mining machines located at the left and right ends of the working face to synchronously open a notch and cut obliquely toward the middle of the working face, and start normal mining operations on the extra-long mining working face until the two coal mining machines mine to the middle of the extra-long working face; S3. When the two coal mining machines reach the middle of the extra-long mining face, any one of the two coal mining machines starts to run in the reverse direction and starts to carry out reverse normal cutting and mining operations on the part of the working face it has cut, while the other coal mining machine keeps running in the same direction and carries out cutting and mining operations on the middle of the extra-long working face; S4, after the coal mining machine mining the middle part of the extra-long working face completes the cutting and mining operation at the middle position, it starts to run in the reverse direction, running towards the initial working position of the mining machine at the end of the extra-long working face, and starts to perform normal cutting and mining operations on the working face it has mined; Steps S5 and S1-S4 constitute a working cycle, and multiple working cycles are performed in sequence to complete the mining work on the super-long working face.

2. The method for mining a super-long working face with a single coal outlet according to claim 1, wherein S2 specifically comprises the following steps: S21, two coal mining machines cut into the coal face obliquely from both ends of the extra-long working face, forming triangular coal areas at both ends of the extra-long working face; S22, controlling the two coal mining machines to run in opposite directions respectively, and completing the mining of the triangular coal areas at both ends of the super-long working face; S23. After completing the mining of the triangular coal area, the two coal mining machines changed the mining direction and resumed mining towards the middle of the super-long working face.

3. A method for mining a super-long working face with a single coal outlet as claimed in claim 1 or 2, wherein in said S3, when the first coal mining machine runs in the reverse direction, the first coal mining machine cuts obliquely in the direction of its movement to form a first central triangular coal area in the middle of the working face, and directly starts to move in the reverse direction after completing the oblique cutting to perform normal mining operations; When the first coal shearer starts to run in the reverse direction, the second coal shearer maintains its original direction of running towards the middle of the super-long mining face and moves until it runs to the oblique cutting position of the first coal shearer. After completing the cutting in the middle of the working face, the second coal shearer starts to run in the reverse direction and cuts obliquely from the middle of the working face to form a second middle triangular coal area in the middle of the working face; After the second coal mining machine completes the reverse bevel cutting, it resumes moving toward the middle of the working face and The coal mining area is mined until the mining is stopped at the first middle triangular coal area. After completion, the second coal mining machine runs in the reverse direction again. After the empty knife runs to the oblique cutting position in the middle of the working face, the working face is normally cut and mined to the initial working position of the coal mining machine at the end of the working face. When the second coal mining machine mines to the first middle triangular area and then runs in the opposite direction again, the first coal mining machine simultaneously changes its running direction and moves with an empty knife toward the middle of the working face to the first middle triangular area, and begins to cut the middle first triangular area and cut through the coal body in the first middle triangular area. After that, the first coal mining machine changes its running direction and moves toward its initial working position at the end of the working face. After running with an empty knife for a distance, it performs cutting and mining operations on the working face normally.

4. A single coal outlet mining method for an ultra-long working face as described in claim 3, wherein in any adjacent working cycles, the first coal mining machine and the second coal mining machine alternately perform cutting and mining operations on the middle position of the working face, and the two coal mining machines execute each other's mining action processes in different mining working cycles.

5. A single coal outlet mining method for an ultra-long working face as described in claim 3 or 4, wherein when the first coal mining machine completes the oblique cutting in the middle of the working face, the second coal mining machine completes the mining and cutting operation in the middle of the working face.

6. A single coal outlet mining method for an ultra-long working face as described in any one of claims 3 to 5, wherein when two coal mining machines are running toward the end of the ultra-long working face to perform coal mining operations, the two coal mining machines reach the initial working positions at the two ends of the ultra-long working face respectively and simultaneously.

7. A method for mining a super-long working face with a single coal outlet as claimed in claim 6, wherein in order to ensure that the two coal mining machines can reach their respective initial working positions at the same time, the length of the working face is L, and the average cutting speed of the coal mining machine is V g , the reverse idle time of the middle part of the first coal mining machine is T k2 The time for the first coal mining machine to cut the reverse triangular coal in the middle is T s , the idle time of the first coal mining machine is T k3 , end bevel cutting time T x The time for the coal mining machine to return to cut the triangular coal is T h , the first coal mining machine end operation time is T dtz , the second coal mining machine end operation time is T dty In order to ensure the coordinated mining of the two coal mining machines, the mining length of the first coal mining machine is L m1 , the mining length of the second coal mining machine is L m2 , when only the second coal mining machine is cutting and mining the middle part of the working face, L m1 and L m2 The length should meet certain conditions: L m1 =[LV g (T k2 +T s +T k3 -T x -T h +T tdz -T tdy )] / 2; L m2 =[L+V g (T k2 +T s +T k3 -T x -T h +T tdz -T tdy )] / 2; and L m1 <L m2 .

8. A method for mining a super-long working face with a single coal outlet as claimed in claim 7, wherein when only the second coal mining machine is cutting and mining the middle part of the working face, the length of the working face is L, and the length of the half area mined by the first coal mining machine is L m1 , the length of the mining area of ​​the second coal mining machine is L m2 , roller center distance L1, scraper conveyor bending section length L2, coal mining machine bevel cutting progress speed V x , coal mining machine cutting speed V g , coal mining machine dispatching speed V d , then the running time of the first coal mining machine that reaches the middle of the working face and runs in the reverse direction is T z and the second coal mining machine operating time T for cutting and mining in the middle of the working face y The calculation process is as follows: The first coal mining machine mining time T z The following conditions must be met: End bevel cutting time: T x =(L1+L2) / V x ; Time for the end to return to cut the triangular coal: T h =(L1+L2) / V h ; End empty knife return time: T d =(L1+L2) / V d ; Time to cut coal to the right: T zg1 =[L m1 -(L1+L2)] / V g ; Mid-drive oblique cutting time: T x =(L1+L2) / V x ; Time for mid-drive return to cut triangular coal: T h =(L1+L2) / V h ; First time of empty cutting of the first coal mining machine: T k1 =(L1+L2) / V d ; The second coal mining machine middle drive oblique cutting time: T x =(L1+L2) / V x ; Time for the second coal mining machine to return to cut the triangular coal: T h =(L1+L2) / V h ; The first coal mining machine reverse empty knife time: T k2 =(L1+T x V g +T h V g ) / V d ; Time for the first coal mining machine to reverse triangular coal: T s =L2 / V x ; First coal mining machine idle time: T k3 =(L1+L2+T x V g +T h V g ) / V d Time to cut coal to the left: T zg2 =[L m1 -(L1+L2+T x V g +T h V g )] / V g ; The first coal mining machine mining half area end operation time: T dtz ; First shearer mining half area shearer operation time: T z =2T x +2T h +T d +T k1 +T k2 +T s +T k3 +T zg1 +T zg2 +T dtz ; The second coal mining machine mining time T y The following conditions need to be met: End bevel cutting time: T x =(L1+L2) / V x ; Time for the end to return to cut the triangular coal: T h =(L1+L2) / V h ; End empty knife return time: T d =(L1+L2) / V d ; Time to cut coal to the left: T yg1 =[L m2 -(L1+L2)] / V g ; Right coal machine middle drive oblique cutting time: T x =(L1+L2) / V x ; Time for right coal machine to return to cut triangular coal: T h =(L1+L2) / V h ; Right coal machine reverse empty knife time: T d =(L1+L2) / V d ; Time to cut coal to the right: T yg2 =[L m2 -(L1+L2)] / V g ; Right half end operation time: T dty Coal mining machine operation time in the right half area: T y =2T x +2T h +2T d +T yg1 +T yg2 +T dty ; And it is necessary to ensure T z =T y .

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