Double shearer mining method

Abstract

The present invention provides a dual-miner mining method, which includes a first shearer mining a coal seam starting at point A and mining to point E. The first shearer then continues mining the coal seam from point E in a direction toward point A using an end-on oblique cutter; a second shearer mining the coal seam starting at point B and cutting through the triangular coal left by the first shearer at point E. After cutting through the triangular coal, the second shearer continues mining the coal seam toward point B. The dual-miner mining method of the present invention uses the second shearer to cut through the triangular coal left by the first shearer at point E, thereby shortening the overall operating time of the first and second shearers and improving coal seam mining efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, in particular to a double-coal mining method. Background Art

[0002] In related technology, coal seam mining is performed by installing two shearers on an extra-long working face to improve mining efficiency. The two shearers have different travel ranges, and during mining, the shearers must reciprocate along their corresponding travel ranges to mine the coal seam. However, because the shearers need to cut through any triangular coal left behind during their movement, this results in longer operating times and reduced mining efficiency. Summary of the Invention

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, embodiments of the present invention provide a dual-miner mining method, in which a second shearer is used to cut through the triangular coal left by the first shearer at point E, thereby shortening the operating time of the first and second shearers and improving coal seam mining efficiency.

[0004] The dual-coal mining method of the embodiment of the present invention includes:

[0005] The first coal mining machine and the second coal mining machine are set on the coal mining working surface, and points A, O, E and B are set on the coal mining working surface. Point O is located between point A and point B, and L AO >L OB , where L AO is the distance between point A and point O, L OB is the distance between point O and point B, point E is located between point O and point B, and L OE ≥L S , where L OE is the distance between point O and point E, L S is the length of the first coal mining machine;

[0006] The first coal mining machine starts mining the coal seam from point A and mines to point E, and then the first coal mining machine continues mining the coal seam from point E in a direction toward point A using an end oblique cutter feed;

[0007] The second coal mining machine starts to mine the coal seam from point B and cuts through the triangular coal left by the first coal mining machine at point E. After cutting through the triangular coal, the second coal mining machine continues to mine the coal seam toward point B.

[0008] The dual-coal mining method of an embodiment of the present invention uses the first coal mining machine to mainly mine the portion of the coal seam located between points A and O, and uses the second coal mining machine to mainly mine the portion of the coal seam located between points O and B, and the distance between points A and O is greater than the distance between points O and B, and the second coal mining machine is used to cut through the triangular coal left by the first coal mining machine at point E, thereby shortening the overall operating time of the first coal mining machine and the second coal mining machine, and improving the mining efficiency of the coal seam.

[0009] In some embodiments, the step of the first coal mining machine mining the coal seam from point A to point E specifically includes:

[0010] Setting point C on the coal mining working surface, wherein point C is located between point A and point O, and the distance between point A and point C is greater than the feed distance of the first coal mining machine;

[0011] The first coal mining machine mines the coal seam from point A using an end oblique cutter and mines to point C;

[0012] Then the first coal mining machine continues to mine the coal seam from point C in the direction toward point A, and returns to point A;

[0013] Then the first coal mining machine mines the coal seam again from the point A and mines to the point E.

[0014] In some embodiments, the step of mining the coal seam from point B by the second coal shearer and cutting through the triangular coal left by the first coal shearer at point E specifically includes:

[0015] The second coal mining machine mines the coal seam from point B by using the middle oblique cutting and mining to point O, and the feed distance L of the second coal mining machine is D Meet 2×L OB / 3≥L D ≥L OB / 3;

[0016] Then the second coal mining machine continues to mine the coal seam from the point O in the direction toward the point B, and returns to the point B;

[0017] Then the second coal mining machine again mines the coal seam from the point B using a central oblique cut, and cuts through the triangular coal left by the first coal mining machine at the point E.

[0018] In some embodiments, when the first shearer starts to move from the point A for the first time, the second shearer starts to move from the point B for the first time; and / or

[0019] The dual shearer mining method further comprises:

[0020] The first coal mining machine continues to mine the coal seam from point E in the direction toward point A, and completes mining when mining reaches point A;

[0021] After the second shearer cuts through the triangular coal left by the first shearer at point E, the second shearer continues mining the coal seam toward point B and completes mining at point B;

[0022] The time length from the start of mining to the completion of mining by the first coal mining machine is equal to the time length from the start of mining to the completion of mining by the second coal mining machine.

[0023] In some embodiments, when the first coal mining machine starts to move from the point E in the direction toward the point A, the second coal mining machine starts to move again from the point B.

[0024] In some embodiments, the cutting distance L of the second coal mining machine D Meet L D =L OB / 2.

[0025] In some embodiments, point D and point G are set on the coal mining face, point D is located between point O and point B, and the distance between point D and point B is the feed distance of the second coal mining machine from point B to mine the coal seam, point G is located between point A and point O, and the distance between point A and point G is the feed distance of the first coal mining machine from point A to mine the coal seam, the coal mining face is provided with a scraper conveyor for guiding the first coal mining machine and the second coal mining machine, the scraper conveyor and the coal seam are arranged relative to each other in a first direction, and the portion of the scraper conveyor between point A and point G and the portion of the scraper conveyor between point D and point B are farther away from the coal seam in the first direction than the portion of the scraper conveyor between point G and point D;

[0026] The dual shearer mining method further comprises:

[0027] After the first coal mining machine mines the coal seam for the first time from point A and passes point G, pushing the portion of the scraper conveyor between point A and point G in the first direction toward the coal seam so that the portion of the scraper conveyor between point A and point O remains straight;

[0028] After the second coal mining machine mines the coal seam for the first time from point B and passes point D, pushing the portion of the scraper conveyor between point B and point D in the first direction toward the coal seam so that the portion of the scraper conveyor between point B and point O remains straight;

[0029] After the first coal mining machine mines the coal seam again from the point A and passes the point O, pushing the portion of the scraper conveyor between the point A and the point O in the first direction toward the coal seam;

[0030] Before the second coal mining machine mines the coal seam again from point B, the scraper conveyor is pushed in the first direction toward the coal seam at least in the portion between point O and point D, so that the portion between point A and point D of the scraper conveyor remains straight;

[0031] After the second coal mining machine mines the coal seam again from point B and passes point D, the portion of the scraper conveyor between point D and point B is pushed in the first direction toward the coal seam to keep the scraper conveyor straight at least in the portion between point A and point B.

[0032] In some embodiments, the distance L between the point A and the point C is AC Meet L AC ≥2×L S +L g , where L g is the length of the curved section of the scraper conveyor.

[0033] In some embodiments, point F is set on the coal mining working surface, and the second coal mining machine is located at point F when the first coal mining machine cuts through the triangular coal left by the first coal mining machine at point E. The distance L between point F and point O is FO Meet L FO ≥L S +L g , where L g is the length of the curved section of the scraper conveyor.

[0034] In some embodiments, the coal mining working face is an extra-long working face with a length greater than or equal to 600m. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a state diagram of the dual-coal mining method according to an embodiment of the present invention. Figure 1 ;

[0036] Figure 2This is a state diagram of the dual-coal mining method according to an embodiment of the present invention. Figure 2 ;

[0037] Figure 3 This is a state diagram of the dual-coal mining method according to an embodiment of the present invention. Figure 3 ;

[0038] Figure 4 This is a state diagram of the dual-coal mining method according to an embodiment of the present invention. Figure 4 ;

[0039] Figure 5 This is a state diagram of the dual-coal mining method according to an embodiment of the present invention. Figure 5 ;

[0040] Figure 6 This is a state diagram of the dual-coal mining method according to an embodiment of the present invention. Figure 6 ;

[0041] Figure 7 This is a state diagram of the dual-coal mining method according to an embodiment of the present invention. Figure 7 ;

[0042] Figure 8 This is a state diagram of the dual-coal mining method according to an embodiment of the present invention. Figure 8 ;

[0043] Figure 9 This is a state diagram of the dual-coal mining method according to an embodiment of the present invention. Figure 9 ;

[0044] Figure 10 This is a state diagram of the dual-coal mining method according to an embodiment of the present invention. Figure 10 ;

[0045] Figure 11 This is a state diagram of the dual-coal mining method according to an embodiment of the present invention. Figure 10 one;

[0046] Figure 12 This is a schematic diagram of the structure of the first coal mining machine and the second coal mining machine in the embodiment of the present invention. Figure 1 ;

[0047] Figure 13 This is a schematic diagram of the structure of the first coal mining machine and the second coal mining machine in the embodiment of the present invention. Figure 2 .

[0048] Reference numerals:

[0049] 1. First coal mining machine; 2. Second coal mining machine; 3. Scraper conveyor; 31. Scraper bending section; 4. First roller; 5. Second roller; 6. Coal seam. DETAILED DESCRIPTION

[0050] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0051] Please refer to the following Figure 1 -Attached Figure 13 A dual shearer mining method according to an embodiment of the invention is described.

[0052] As attached Figure 1 -Attached Figure 13 As shown, the dual-coal mining method of the embodiment of the present invention includes setting a first coal mining machine 1 and a second coal mining machine 2 on the coal mining working surface, setting points A, O, E and B on the coal mining working surface, with point O located between point A and point B, and L AO >L OB , where L AO is the distance between point A and point O, L OB is the distance between point O and point B, point E is between point O and point B, and L OE ≥L S , where L OE is the distance between point O and point E, L S is the body length of the first coal mining machine 1.

[0053] The first coal mining machine 1 starts to mine the coal seam 6 from point A and mines to point E. Then, the first coal mining machine 1 continues to mine the coal seam 6 from point E in the direction toward point A by using an end oblique cutting feed.

[0054] The second shearer 2 starts mining the coal seam 6 from point B and cuts through the triangular coal left by the first shearer 1 at point E. After cutting through the triangular coal, the second shearer 2 continues mining the coal seam 6 toward point B.

[0055] like Figure 1 、 Figures 7 to 11 As shown, the coal mining face extends in the left-right direction, and the coal mining face is provided with a first coal mining machine 1, a second coal mining machine 2 and a scraper conveyor 3. The scraper conveyor 3 is located behind the coal seam 6 and extends in the left-right direction. The first coal mining machine 1 and the second coal mining machine 2 are arranged on the scraper conveyor 3 and can move in the left-right direction under the guidance of the scraper conveyor 3 to realize the mining of the coal seam 6. The first coal mining machine 1 is located at the tail of the scraper conveyor 3, and the second coal mining machine 2 is located at the head of the scraper conveyor 3. The coal flow direction of the scraper conveyor 3 is from left to right. The coal mining face is sequentially set with points A, O, E and B from left to right. L AO >L OB , L OE ≥L S .

[0056] like Figure 1 As shown, at the starting position, the first coal mining machine 1 is located at point A and the second coal mining machine 2 is located at point B. The first coal mining machine 1 moves rightward from point A to start mining the coal seam 6 and moves to point E. Figure 7-Figure 9 As shown in FIG. 1 , after the first shearer 1 moves to point E, it moves leftward from point E using an end-side oblique cut to continue mining the coal seam 6. At this time, a triangular coal left by the first shearer 1 appears at point E. The second shearer 2 moves leftward from point B to start mining the coal seam 6. Figure 10 and Figure 11 As shown, the second shearer 2 cuts through the triangular coal left by the first shearer 1 at point E during the mining process, and moves to the right to continue mining the coal seam 6 after cutting through the triangular coal.

[0057] The dual-miner mining method of the embodiment of the present invention uses a first miner to mainly mine the portion of the coal seam between point A and point O, and uses a second miner to mainly mine the portion of the coal seam between point O and point B, and the distance between point A and point O is greater than the distance between point O and point B, so that the working efficiency of the first miner and the second miner can be fully utilized to improve the mining efficiency of the coal seam. During the mining process, the second miner is used to cut through the triangular coal left by the first miner at point E, so that the first miner does not need to add an additional reciprocating movement between point A and point O to remove the triangular coal left at point E, thereby shortening the operating time of the first miner. At the same time, since the distance between point O and point B is less than the distance between point A and point O, and the first miner uses an end oblique cutting feed at point E, by setting the position of point O, using the second miner to cut through the triangular coal left at point E will not extend the operating time of the second miner, but can instead fully utilize the working efficiency of the second miner. Therefore, the dual-coal shearer mining method according to the embodiment of the present invention can shorten the overall operating time of the first coal shearer and the second coal shearer, thereby improving the mining efficiency of the coal seam.

[0058] In some embodiments, the first coal mining machine 1 mines the coal seam 6 from point A, and the step of mining to point E specifically includes setting point C on the coal mining working face, point C is located between point A and point O, and the distance between point A and point C is greater than the feed distance of the first coal mining machine 1.

[0059] Preferably, the distance L between point A and point C is AC Meet L AC ≥2×L S +L g , where L g is the length of the scraper bending section 31 of the scraper conveyor 3.

[0060] The first coal mining machine 1 mines the coal seam 6 from point A using an end oblique cutter and mines to point C. The first coal mining machine 1 then continues mining the coal seam 6 from point C in the direction toward point A and returns to point A.

[0061] Specifically, if Figures 1-4 As shown, the first shearer 1 first moves rightward from point A using an end-on bevel feed to mine coal seam 6, and continues mining to point C. During this process, a triangular coal section left behind by the first shearer 1 appears at point A. After reaching point C, the first shearer 1 moves leftward from point C to continue mining coal seam 6, and returns to point A to cut through the triangular coal section left behind by the first shearer 1 at point A, thus completing the first cut of the coal seam between points A and C.

[0062] Then the first coal mining machine 1 mines the coal seam 6 again from point A and mines to point E.

[0063] Specifically, if Figure 5-Figure 6 As shown, after the first coal mining machine 1 returns to point A, it moves to the right again from point A to mine the coal seam 6, and mines to point E. During this process, since the part between point A and point C has been cut once, the first coal mining machine 1 is in an empty knife state between point A and point C, and then starting from point C, the first cutting is performed on the part of the coal seam 6 to the right of point C.

[0064] In some embodiments, the second shearer 2 mines the coal seam 6 from point B and cuts through the triangular coal left by the first shearer 1 at point E. Specifically, the second shearer 2 mines the coal seam 6 from point B using a central oblique cut to mine the coal seam 6 to point O, and the feed distance L of the second shearer 2 is D Meet 2×L OB / 3≥L D ≥L OB Then the second coal mining machine 2 continues to mine the coal seam 6 from point O in the direction toward point B and returns to point B.

[0065] Specifically, if Figure 1-Figure 7 As shown, the second shearer 2 moves leftward from point B using a central oblique cut to mine the coal seam 6, and mines to point O. The feed distance L of the second shearer 2 is D Meet 2×L OB / 3≥L D ≥L OB / 3, in other words, the middle part of the middle oblique cutting refers to the middle part between point O and point B. During this process, the second shearer 2 leaves a triangular coal at point B. After the second shearer 2 reaches point O, it continues to mine the coal seam 6 from point O in the direction toward point B, and returns to point B to cut through the triangular coal left by the second shearer 2 at point B, thereby performing the first cutting of the coal seam between point O and point B. Preferably, the feed distance L of the second shearer 2 is D Meet L D =L OB / 2, in the process of the first coal mining machine 1 and the second coal mining machine 2 mining the coal seam 6, the second coal mining machine 2 first mines coal and moves to point O. In the process of the second coal mining machine 2 moving from point O to the right, the first coal mining machine 1 reaches point O and continues to move to point E. Therefore, in the process of the first coal mining machine 1 starting to move from point A again and reaching point E, the first coal mining machine 1 is in an empty knife state between point A and point C, and in an empty knife state between point O and point E. The first coal mining machine 1 performs the first cutting on the part of the coal seam 6 between point C and point O.

[0066] Then the second shearer 2 again mines the coal seam 6 from point B using a central oblique cut, and cuts through the triangular coal left at point E by the first shearer 1.

[0067] Specifically, if Figures 8-10 As shown, the second shearer 2 again moves leftward from point B using a central oblique cut to mine coal seam 6, and moves to the left of point O to cut through the triangular coal left by the first shearer 1 at point E. During this process, the second shearer 2 performs a second cut on the portion of coal seam 6 between points O and D, leaving another triangular coal between points D and B. Point D is set on the coal mining face, and the distance between points D and B represents the feed distance of the second shearer 2 mining coal seam 6 from point B.

[0068] Preferably, Figure 10 As shown, point F is set on the coal mining working face. When the second shearer 2 cuts through the triangular coal left by the first shearer 1 at point E, it is located at point F. The distance L between point F and point O is FO Meet L FO ≥L S +L g , where L g is the length of the scraper curved section 31 of the scraper conveyor 3.

[0069] The second coal mining machine adopts the middle oblique cutting feed to make the mining process and operation time of the second coal mining machine more coordinated with the mining process and operation time of the first coal mining machine. On the one hand, it can avoid interference between the first coal mining machine and the second coal mining machine. On the other hand, it can shorten the overall operation time of the first coal mining machine and the second coal mining machine, thereby improving the mining efficiency of the coal seam.

[0070] It can be understood that the second coal mining machine is not limited to adopting the middle oblique cutting feeding method. In other embodiments, the second coal mining machine adopts the end oblique cutting feeding method.

[0071] In some implementations, when the first shearer 1 starts moving from point A for the first time, the second shearer 2 starts moving from point B for the first time. And / or the dual-shearer mining method of an embodiment of the present invention further includes the first shearer 1 continuing to mine the coal seam 6 from point E in a direction toward point A, and completing mining when mining reaches point A; after the second shearer 2 cuts through the triangular coal left by the first shearer 1 at point E, the second shearer 2 continues to mine the coal seam 6 toward point B, and completes mining when mining reaches point B; the time between the start and completion of mining by the first shearer 1 and the time between the start and completion of mining by the second shearer 2 are equal.

[0072] like Figure 1 As shown, when the first coal mining machine 1 moves to the right from point A for the first time, the second coal mining machine 2 moves to the left from point B for the first time, so that in the subsequent mining process, the second coal mining machine 2 reaches point O first, and when the second coal mining machine 2 moves to the right from point O, the first coal mining machine 1 moves to point O, avoiding interference between the first coal mining machine 1 and the second coal mining machine 2, and ensuring the coordination of the first coal mining machine 1 and the second coal mining machine 2.

[0073] like Figure 10-11 As shown, the first shearer 1 moves leftward from point E to point A to perform a second cut on the portion of the coal seam 6 between points A and O, and the first shearer 1 completes mining of the coal seam 6 when it reaches point A. After cutting through the triangular coal left by the first shearer 1 at point E, the second shearer 2 moves rightward to point B to cut through the triangular coal left by the second shearer 2, completing a second cut on the portion of the coal seam 6 between points O and B, and the second shearer 2 completes mining of the coal seam 6 when it reaches point B.

[0074] The time it takes for the first shearer 1 to start mining and finish mining is equal to the time it takes for the second shearer 2 to start mining and finish mining. In other words, the time it takes for the first shearer 1 to complete two cuts is equal to the time it takes for the second shearer 2 to complete two cuts. On the one hand, this ensures that when the first shearer 1 and the second shearer 2 continue mining the coal seam, the second shearer 2 arrives at point O first, and only when the second shearer 2 moves to the right from point O does the first shearer 1 move to point O, avoiding interference between the first and second shearers 1 and 2 and ensuring coordination between the first and second shearers 1 and 2. On the other hand, the position of point O can be determined based on the time it takes for the first and second shearers 1 and 2 to run.

[0075] It is understood that the first and second shearers are not limited to simultaneously satisfying the first and second shearer operating time requirements and the first and second shearers starting mining at the same time. In other implementations, the first and second shearers have different operating time requirements, and the first and second shearers start mining at the same time to ensure coordination between the first and second shearers. Alternatively, the first and second shearers have different starting times, and the first and second shearers have equal running times to ensure coordination between the first and second shearers.

[0076] In some embodiments, when the first coal mining machine 1 starts to move from point E in the direction toward point A, the second coal mining machine 2 starts to move from point B again.

[0077] like Figure 7 As shown, while the first shearer 1 moves leftward from point E, the second shearer 2 moves leftward again from point B, so that the first shearer 1 and the second shearer 2 can complete mining at the same time, ensuring the coordination of the first shearer 1 and the second shearer 2. Furthermore, the first shearer 1 and the second shearer 2 can start mining at the same time and / or the running time of the first shearer 1 and the second shearer 2 is equal.

[0078] In some embodiments, point D and point G are set on the coal mining working surface, point D is located between point O and point B, and the distance between point D and point B is the feed distance of the second coal mining machine 2 from point B to mine the coal seam 6, point G is located between point A and point O, and the distance between point A and point G is the feed distance of the first coal mining machine 1 from point A to mine the coal seam 6, and the coal mining working surface is provided with a scraper conveyor 3 for guiding the first coal mining machine 1 and the second coal mining machine 2, and the scraper conveyor 3 and the coal seam 6 are in the first direction (such as Figure 1 The portion of the scraper conveyor 3 between point A and point G and the portion of the scraper conveyor 3 between point D and point B are relatively arranged in the front-to-back direction as shown, and the portion of the scraper conveyor 3 between point D and point B are farther away from the coal seam 6 in the first direction than the portion of the scraper conveyor 3 between point G and point D.

[0079] The dual-coal mining method of an embodiment of the present invention also includes pushing the portion of the scraper conveyor 3 between points A and G in a first direction toward the coal seam 6 after the first coal mining machine 1 mines the coal seam 6 from point A for the first time and passes point G, so that the portion of the scraper conveyor 3 between points A and O remains straight.

[0080] After the second coal mining machine 2 mines the coal seam 6 for the first time from point B and passes point D, the portion of the scraper conveyor 3 between points B and D is pushed in the first direction toward the coal seam 6 to keep the portion of the scraper conveyor 3 between points B and O straight.

[0081] After the first coal mining machine 1 mines the coal seam 6 again from point A and passes point O, the portion of the scraper conveyor 3 between points A and O is pushed in the first direction toward the coal seam 6 .

[0082] Before the second coal mining machine 2 mines the coal seam 6 again from point B, the scraper conveyor 3 is pushed in the first direction toward the coal seam 6 at least between points O and D to keep the scraper conveyor 3 between points A and D straight.

[0083] After the second coal mining machine 2 mines the coal seam 6 again from point B and passes point D, the portion of the scraper conveyor 3 between points D and B is pushed in the first direction toward the coal seam 6 to keep at least the portion of the scraper conveyor 3 between points A and B straight.

[0084] like Figure 12 and Figure 13 As shown, the first coal mining machine 1 and the second coal mining machine 2 preferably adopt double-drum coal mining machines, and the first coal mining machine 1 and the second coal mining machine 2 both include a first drum 4 and a second drum 5, wherein the first drum 4 is located on the left and the second coal mining machine 2 is located on the right, and the first drum 4 and the second drum 5 can move in the front and rear directions respectively. Figure 12 In the structure shown, the first roller 4 extends backward and the second roller 5 extends forward. Figure 13 In the illustrated structure, the first roller 4 extends forward and the second roller 5 extends backward.

[0085] like Figures 1-13 As shown, the dual-coal mining method of the embodiment of the present invention preferably includes Figures 1-11 eleven states.

[0086] Status as before Figure 1 As shown, at this time, the first coal mining machine 1 is located at point A, the second coal mining machine 2 is located at point B, the portion of the scraper conveyor 3 between point A and point G and the portion of the scraper conveyor 3 between point D and point B are farther away from the coal seam 6 in the front-to-back direction than the portion of the scraper conveyor 3 between point G and point D, so that the first coal mining machine 1 can subsequently feed in an end oblique cutting manner, and the second coal mining machine 2 can subsequently feed in a middle oblique cutting manner, the right end of the portion of the scraper conveyor 3 between point A and point G is the scraper bending section 31, and the left end of the portion of the scraper conveyor 3 between point D and point B is the scraper bending section 31.

[0087] Status 2 Figure 2As shown, the first shearer 1 initially moves rightward from point A to mine the coal seam 6, with the first roller 4 of the first shearer 1 extending rearward and the second roller 5 of the first shearer 1 extending forward. The second shearer 2 moves synchronously with the first shearer 1 and initially moves leftward from point B to mine the coal seam 6, with the first roller 4 of the second shearer 2 extending forward and the second roller 5 of the second shearer 2 extending rearward.

[0088] Status three Figure 3 As shown, the first shearer 1 first moves rightward from point A and reaches point C. After the first shearer 1 first mines the coal seam 6 from point A and passes point G, the portion of the chute conveyor 3 between points A and G is pushed forward to keep the portion of the chute conveyor 3 between points A and O straight, allowing the first shearer 1 to subsequently cut through the triangular coal left at point A. Preferably, the portion of the chute conveyor 3 between points A and G is pushed forward when the first shearer 1 reaches point C. The second shearer 2 first moves leftward from point B and passes point D. After the second shearer 2 passes point D, the portion of the chute conveyor 3 between points B and D is pushed forward to keep the portion of the chute conveyor 3 between points B and O straight, allowing the second shearer 2 to subsequently cut through the triangular coal left at point B. Preferably, the portion of the chute conveyor 3 between points B and D is pushed forward synchronously with the portion of the chute conveyor 3 between points A and G.

[0089] Status 4 Figure 4 As shown, the first shearer 1 moves leftward from point C to point A with the first roller 4 extending forward and the second roller 5 extending backward, so as to cut through the triangular coal left by the first shearer 1 at point A. The second shearer 2 continues to move leftward.

[0090] Status Five Figure 5 As shown, the first shearer 1 moves rightward again from point A with the first roller 4 extending rearward and the second roller 5 extending forward, and is located between point C and point O. The second shearer 2 reaches point O.

[0091] Status Six Figure 6 As shown, the second shearer 2 moves rightward from point O with the first roller 4 extending rearward and the second roller 5 extending forward. The first shearer 1 maintains a certain distance from the second shearer 2 and continues to move rightward to point O. Preferably, when the first shearer 1 reaches point O, the second shearer 2 reaches point D.

[0092] Status 7 Figure 7As shown, the second shearer 2 continues to move rightward to point B to cut through the triangular coal remaining at point B. The first shearer 1 maintains a certain distance from the second shearer 2 and continues to move rightward to point E. After the first shearer 1 passes point O, it pushes forward the portion of the chute conveyor 3 between points A and O. The right end of the portion of the chute conveyor 3 between points A and O forms a curved scraper section 31, enabling the first shearer 1 to subsequently perform a second cut on the coal seam 6. Preferably, when the first shearer 1 reaches point E, it pushes forward the portion of the chute conveyor 3 between points A and O.

[0093] Status Eight Figure 8 As shown, before the second shearer 2 mines the coal seam 6 again from point B, the portion of the chute conveyor 3 between the point corresponding to the feed position of the second shearer 2 and point O is pushed forward. The point corresponding to the feed position of the second shearer 2 is located between point D and point B, and the portion of the chute conveyor 3 between the point corresponding to the feed position of the second shearer 2 and point D is a curved scraper section 31, so that the portion of the chute conveyor 3 between points A and D remains straight, allowing the second shearer 2 to subsequently perform a second cut on the coal seam 6. Preferably, when the second shearer 2 is at point B, the portion of the chute conveyor 3 between the point corresponding to the feed position of the second shearer 2 and point O is pushed forward.

[0094] Then, the first shearer 1 moves leftward from point E with the first roller 4 extended forward and the second roller 5 extended backward, to perform a second cut on the coal seam 6, leaving a triangular coal at point E. The second shearer 2 moves leftward from point B for the second time with the first roller 4 extended forward and the second roller 5 extended backward, and is located between points D and B.

[0095] Status Nine Figure 9 As shown, the first coal mining machine 1 and the second coal mining machine 2 continue to move to the left to mine the coal seam 6. Preferably, when the second coal mining machine 2 reaches point O, the first coal mining machine 1 is located at the midpoint between point A and point O, or passes through the midpoint between point A and point O.

[0096] Status Figure 10 As shown, the first shearer 1 continues to move leftward to point F, thereby cutting through the triangular coal left by the first shearer 1 at point E. After the second shearer 2 passes point D, the portion of the chute conveyor 3 between points D and B is pushed forward to keep the portion of the chute conveyor 3 between points A and B straight, allowing the second shearer 2 to subsequently cut through the triangular coal left at point B. Preferably, when the second shearer 2 is at point F, the portion of the chute conveyor 3 between points D and B is pushed forward.

[0097] Status 11 Figure 11As shown, the first coal mining machine 1 moves to point A to complete the mining of the coal seam 6, and the second coal mining machine 2 moves from point F to the right and to point B with the first roller 4 extending backward and the second roller 5 extending forward to complete the mining of the coal seam 6.

[0098] After the first coal mining machine 1 and the second coal mining machine 2 have completed the mining of the coal seam 6, the first coal mining machine 1 and the second coal mining machine 2 can be shut down or on standby, or the scraper conveyor 3 can be pushed to put the scraper conveyor 3 in state one, and then the first coal mining machine 1 and the second coal mining machine 2 can be used to mine the coal seam 6 for the next time.

[0099] It should be noted that the first coal mining machine 1 and the second coal mining machine 2 are not limited to starting in state 1, nor are they limited to stopping or standing by in state 11. During the process of mining the coal seam 6, the first coal mining machine 1 and the second coal mining machine 2 can stop or stand by in any state, and continue to operate from the state when they were stopped or on standby after restarting.

[0100] The dual-coal mining method of the embodiment of the present invention is applicable to ultra-long working faces. In other words, the coal mining working face is an ultra-long working face. The ultra-long working face refers to a coal mining working face with a length greater than or equal to 450m. Preferably, the coal mining working face is an ultra-long working face with a length greater than or equal to 600m.

[0101] In the description of the present invention, it should be understood that the terms "length", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0102] Furthermore, the terms "first" and "second" are used solely for distinction and are not to be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0103] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean 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 invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0104] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A dual-coal mining method, characterized in that: include: A first coal mining machine (1) and a second coal mining machine (2) are arranged on the coal mining working surface, and points A, O, E and B are set on the coal mining working surface, with point O located between point A and point B, and L AO >L OB , where L AO is the distance between point A and point O, L OB is the distance between point O and point B, point E is located between point O and point B, and L OE ≥L S , where L OE is the distance between point O and point E, L S is the body length of the first coal mining machine (1); The first coal mining machine (1) starts mining the coal seam (6) from the point A and mines to the point E, and then the first coal mining machine (1) continues mining the coal seam (6) from the point E in a direction toward the point A by using an end oblique cutter; The second coal mining machine (2) starts mining the coal seam (6) from the point B and cuts through the triangular coal left by the first coal mining machine (1) at the point E. After cutting through the triangular coal, the second coal mining machine (2) continues mining the coal seam (6) toward the point B. The steps of the first coal mining machine (1) mining the coal seam (6) from point A and mining to point E specifically include: setting point C on the coal mining working surface, wherein point C is located between point A and point O, and the distance between point A and point C is greater than the feed distance of the first coal mining machine (1); the first coal mining machine (1) mines the coal seam (6) from point A using end oblique cutting feed and mines to point C; then the first coal mining machine (1) continues to mine the coal seam (6) from point C in the direction toward point A and returns to point A; then the first coal mining machine (1) mines the coal seam (6) again from point A and mines to point E; The steps of the second coal mining machine (2) mining the coal seam (6) from point B and cutting through the triangular coal left by the first coal mining machine (1) at point E specifically include: the second coal mining machine (2) mining the coal seam (6) from point B using a central oblique cutting feed and mining to point O, and the feed distance L of the second coal mining machine (2) is D Meet 2×L OB / 3≥L D ≥L OB / 3; then the second coal mining machine (2) continues to mine the coal seam (6) from point O in the direction toward point B and returns to point B; then the second coal mining machine (2) mines the coal seam (6) again from point B using a central oblique cut and cuts through the triangular coal left by the first coal mining machine (1) at point E.

2. The dual-coal mining method according to claim 1, characterized in that: When the first coal mining machine (1) starts to move from the point A for the first time, the second coal mining machine (2) starts to move from the point B for the first time; and / or The dual shearer mining method further comprises: The first coal mining machine (1) continues mining the coal seam (6) from point E in a direction toward point A, and completes mining when mining reaches point A; After the second coal mining machine (2) cuts through the triangular coal left by the first coal mining machine (1) at the point E, the second coal mining machine (2) continues to mine the coal seam (6) toward the point B, and completes the mining when it reaches the point B; The duration from the start of mining to the completion of mining by the first coal mining machine (1) is equal to the duration from the start of mining to the completion of mining by the second coal mining machine (2).

3. The dual-coal mining method according to claim 2, characterized in that: When the first coal mining machine (1) starts to move from the point E in the direction toward the point A, the second coal mining machine (2) starts to move again from the point B.

4. The dual-coal mining method according to claim 1, characterized in that: The cutting distance L of the second coal mining machine (2) D Meet L D =L OB / 2.

5. The dual-coal mining method according to any one of claims 1 to 4, characterized in that: Point D and point G are set on the coal mining working face, point D is located between point O and point B, and the distance between point D and point B is the feed distance of the second coal mining machine (2) from point B to mine the coal seam (6), point G is located between point A and point O, and the distance between point A and point G is the feed distance of the first coal mining machine (1) from point A to mine the coal seam (6), the coal mining working face is provided with a scraper conveyor (3) for guiding the first coal mining machine (1) and the second coal mining machine (2), the scraper conveyor (3) and the coal seam (6) are arranged relative to each other in a first direction, and the portion of the scraper conveyor (3) between point A and point G and the portion of the scraper conveyor (3) between point D and point B are farther away from the coal seam (6) in the first direction than the portion of the scraper conveyor (3) between point G and point D; The dual shearer mining method further comprises: After the first coal mining machine (1) mines the coal seam (6) from the point A for the first time and passes the point G, the portion of the scraper conveyor (3) between the point A and the point G is pushed in the first direction toward the coal seam (6) so that the portion of the scraper conveyor (3) between the point A and the point O remains straight; After the second coal mining machine (2) mines the coal seam (6) from the point B for the first time and passes the point D, the portion of the scraper conveyor (3) between the point B and the point D is pushed in the first direction toward the coal seam (6) so that the portion of the scraper conveyor (3) between the point B and the point O remains straight; After the first coal mining machine (1) mines the coal seam (6) again from the point A and passes the point O, the portion of the scraper conveyor (3) between the point A and the point O is pushed in the first direction toward the coal seam (6); Before the second coal mining machine (2) mines the coal seam (6) again from the point B, the scraper conveyor (3) is pushed in the first direction toward the coal seam (6) at least in the portion between the point O and the point D, so that the portion of the scraper conveyor (3) between the point A and the point D remains straight; After the second coal mining machine (2) mines the coal seam (6) again from point B and passes point D, the portion of the scraper conveyor (3) between point D and point B is pushed in the first direction toward the coal seam (6) so that at least the portion of the scraper conveyor (3) between point A and point B remains straight.

6. The dual-coal mining method according to claim 5, characterized in that: The distance L between point A and point C AC Meet L AC ≥2×L S +L g , where L g is the length of the scraper bending section (31) of the scraper conveyor (3).

7. The dual-coal mining method according to claim 5, characterized in that: Point F is set on the coal mining working surface. The second coal mining machine (2) is located at point F when the first coal mining machine (1) cuts through the triangular coal left at point E. The distance L between point F and point O is FO Meet L FO ≥L S +L g , where L g is the length of the scraper bending section (31) of the scraper conveyor (3).

8. The dual-coal mining method according to any one of claims 1 to 4, characterized in that: The coal mining working face is an extra-long working face with a length greater than or equal to 600m.

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