Mixed feed efficient mining method

Abstract

A mixed feed efficient mining method includes the steps that firstly, an air way, a machine way and a cutting hole are formed, a coal pillar is reserved at the left end of a working face, the length of the reserved coal pillar is larger than that of a single-drum coal mining machine, a machine nest is formed in the right side of the reserved coal pillar, and the length of the machine nest is not smaller than the sum of the length of a double-drum coal mining machine and the length of beveling feed; the single-drum coal mining machines are arranged in the roadways at the two ends of the fully mechanized coal mining face, the double-drum coal mining machines are arranged on the scraper conveyor at the machine nest section, when the double-drum coal mining machines run to be close to the left end or the right end of the fully mechanized coal mining face, reverse beveling feeding is directly carried out for next coal cutting, and it is not needed that coal is cut back and forth after conventional beveling feeding is carried out; coal pillars left at the two ends of the working face are cut by the two-end single-drum coal mining machine through vertical feeding, coal mining at the two ends and the middle section of the working face is achieved at the same time, the mining efficiency is greatly improved, the number of arranged working faces is reduced, the labor time of workers is shortened, and the economic benefits of enterprises are increased.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, and specifically, to a high-efficiency mining method with hybrid cutter entry. Background Art

[0002] In the existing coal mining technology, when using a double-drum shearer to mine the working face, the diagonal cutter entry process is generally used. When the double-drum shearer runs to both ends of the working face for the next cut, it needs to make a diagonal cutter entry at the end of the working face and reciprocate at the end to form a cut and cut and clean up the remaining coal. The conventional end diagonal cutter entry process has low efficiency. With the development of coal mine intelligence and the pursuit of improving mining efficiency, it cannot meet the needs of high-speed cutting. To achieve the production target, more working faces need to be arranged or the operation time needs to be extended, which is not conducive to the safe mining of coal mines.

[0003] Chinese invention patent CN 2023118651699 discloses a coal mining method with pre-opened cuts. By additionally arranging single-drum shearers at both ends of the scraper conveyor on the working face, the single-drum shearers make pre-opened cuts through vertical cutter entry. When the double-drum shearer runs to both ends, it makes a diagonal cutter entry into the pre-opened cuts to improve the mining efficiency. However, the depth of the pre-opened cuts at both ends needs to reach twice the cutting depth, and this process does not mention how to effectively support these cuts. On the other hand, there is a situation of running empty when the double-drum shearer makes a diagonal cutter entry into the pre-opened cuts. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the existing technology, and thus provide a high-efficiency mining method with hybrid cutter entry. When the double-drum shearer of the present invention runs close to the left or right end of the working face, it directly makes a reverse diagonal cutter entry for the next cut of coal, without the need for the conventional diagonal cutter entry and then reciprocating cutter entry to cut coal. The coal pillars remaining at both ends of the working face are cut by the single-drum shearers at both ends through vertical cutter entry, realizing simultaneous coal mining at both ends and the middle section of the working face, greatly improving the mining efficiency, being conducive to reducing the number of working face arrangements, reducing the labor time of workers, and increasing the economic benefits of the enterprise.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a high-efficiency mining method with hybrid cutter entry. First, the air roadway, machine roadway, and cutting eye are opened. Then, the specific mining steps are as follows: S1. Leave a coal pillar at the left end of the working face, and the length of the remaining coal pillar is greater than the length of the single-drum shearer. Open a machine pit on the right side of the remaining coal pillar, and the length of the machine pit is not less than the sum of the lengths of the double-drum shearer and the diagonal cutter entry length; S2. In the initial state, one scraper conveyor, several hydraulic supports, two single-drum shearers, and one double-drum shearer are arranged on the working face. The two single-drum shearers are respectively placed on the scraper conveyors in the roadways at both ends of the working face, and the double-drum shearer is placed on the scraper conveyor in the machine pit section; S3. The double-drum shearer cuts into the coal wall obliquely from left to right, and the hydraulic supports in the middle of the working face move the supports to follow the double-drum shearer for roof support. Then the double-drum shearer continues to cut coal from left to right until the length of the remaining coal pillar at the right end of the working face is equal to or equivalent to the initial remaining coal pillar length at the left end. At the same time, the single-drum shearer on the left side cuts the remaining coal pillar at the left end through vertical cutting. During this process, the hydraulic supports at the left end of the working face push the scraper conveyor and move the supports to follow the single-drum shearer on the left side for roof support until the remaining coal pillar at the left end is cut. S4. The hydraulic supports in the middle of the working face follow the scraper conveyor from left to right until they catch up with the double-drum shearer. S5. The double-drum shearer returns and cuts into the coal wall obliquely from right to left, and then the double-drum shearer continues to cut coal from right to left. The hydraulic supports in the middle of the working face move the supports to follow the double-drum shearer for roof support. At the same time, the single-drum shearer on the right side cuts the remaining coal pillar at the right end through vertical cutting. During this process, the hydraulic supports at the right end of the working face push the scraper conveyor and move the supports to follow the single-drum shearer on the right side for roof support until the remaining coal pillar at the right end is cut. S6. The hydraulic supports in the middle of the working face follow the scraper conveyor from right to left until they catch up with the double-drum shearer. S7. The double-drum shearer continues to cut coal from right to left. After the hydraulic supports in the middle of the working face move the supports to follow the double-drum shearer for roof support, they push the scraper conveyor until it cuts to the position where the length of the remaining coal pillar at the left end of the working face is equal to or equivalent to the initial remaining coal pillar length at the left end. At this time, the working face returns to the initial state. S8. Repeat steps S3, S4, S5, S6, and S7 to perform left-right symmetric cyclic coal mining operations until the entire working face is advanced.

[0006] Based on the above, several hydraulic supports located at the head and tail of the scraper conveyor are lag support brackets, and the rest of the hydraulic supports are timely support brackets.

[0007] Based on the above, step S3 is specifically as follows: The double-drum shearer cuts into the coal wall obliquely from left to right, and the timely support brackets in the middle of the working face move the supports to follow the double-drum shearer for roof support. At the same time, the single-drum shearer on the left side cuts into the coal wall vertically from the left roadway, and the single-drum shearer on the left side cuts the remaining coal pillar at the left end from left to right. First, it cuts the top coal. The lag support brackets at the left end of the working face extend the telescopic beams for roof support, and the timely support brackets at the left end of the working face move the supports for roof support and do not push the scraper conveyor temporarily. The double-drum shearer continues to cut coal from left to right, and the immediate support shields in the middle of the working face move to support the roof following the double-drum shearer; meanwhile, after the single-drum shearer on the left cuts through the left-end remaining coal pillar, it returns the shearer from right to left to continue cutting the left-end remaining coal pillar and the bottom coal. The immediate support shields at the left end of the working face follow the scraper conveyor from right to left, and do not move the shields temporarily. After the single-drum shearer on the left enters the left-end roadway, the delayed support shields at the left end of the working face push the scraper conveyor and then retract the telescopic beam and move the shields to support the roof. In this way, the single-drum shearer on the left completes one cycle of cutting the left-end remaining coal pillar with vertical cut-in in the roadway. The double-drum shearer continues to cut coal from left to right, and the immediate support shields in the middle of the working face move to support the roof following the double-drum shearer until it cuts to a length of the right-end remaining coal pillar equal to or equivalent to the initial left-end remaining coal pillar length; meanwhile, the single-drum shearer on the left repeats the cycle of cutting the left-end remaining coal pillar with vertical cut-in in the roadway until after cutting the left-end remaining coal pillar and entering the left-end roadway, the delayed support shields at the left end of the working face push the scraper conveyor and then retract the telescopic beam and move the shields to support the roof. The immediate support shields follow the scraper conveyor and do not move the shields temporarily. The scraper conveyor is pushed from left to right until it catches up with the double-drum shearer.

[0008] Based on the above, step S4 is specifically as follows: The double-drum shearer returns the shearer from right to left and makes an inclined cut-in to cut into the coal wall. The immediate support shields in the middle of the working face move to support the roof following the double-drum shearer, and do not push the scraper conveyor temporarily; meanwhile, the single-drum shearer on the right makes a vertical cut-in from the right-end roadway to cut into the coal wall. The single-drum shearer on the right cuts the right-end remaining coal pillar from right to left, first cutting the top coal. The delayed support shields at the right end of the working face extend the telescopic beam to support the roof, and the immediate support shields at the right end of the working face move the shields to support the roof, and do not push the scraper conveyor temporarily. The double-drum shearer continues to cut coal from right to left, and the immediate support shields in the middle of the working face move to support the roof following the double-drum shearer; meanwhile, after the single-drum shearer on the right cuts through the right-end remaining coal pillar, it returns the shearer from left to right to continue cutting the right-end remaining coal pillar and the bottom coal. The immediate support shields at the right end of the working face follow the scraper conveyor from left to right, and do not move the shields temporarily. After the single-drum shearer on the right enters the right-end roadway, the delayed support shields at the right end of the working face push the scraper conveyor and then retract the telescopic beam and move the shields to support the roof. In this way, the single-drum shearer on the right completes one cycle of cutting the right-end remaining coal pillar with vertical cut-in in the roadway. The double-drum shearer continues to cut coal from right to left, and the immediate support shields in the middle of the working face move to support the roof following the double-drum shearer; meanwhile, the single-drum shearer on the right repeats the cycle of cutting the right-end remaining coal pillar with vertical cut-in in the roadway until after cutting the right-end remaining coal pillar and entering the right-end roadway, the delayed support shields at the right end of the working face push the scraper conveyor and then retract the telescopic beam and move the shields to support the roof. The immediate support shields follow the scraper conveyor and do not move the shields temporarily. The scraper conveyor is pushed from right to left until it catches up with the double-drum shearer.

[0009] Based on the above, step S5 is specifically as follows: The double-drum shearer continues to cut coal from right to left. After the immediate support supports in the middle of the working face move the supports to follow the double-drum shearer for roof support and then push the scraper conveyor, until it cuts to the left end of the working face where the remaining coal pillar is equal or equivalent to the length of the initial remaining coal pillar at the left end. At this time, the working face returns to the initial state.

[0010] The present invention has prominent substantial features and remarkable progress compared with the prior art. Specifically, the present invention arranges single-drum shearers in the roadways at both ends of the fully-mechanized coal mining face, and arranges double-drum shearers on the scraper conveyors in the machine sump sections. When the double-drum shearer runs close to the left or right end of the working face, it directly performs reverse diagonal cutting to start the next cut of coal, without the need for the conventional diagonal cutting and then reciprocating cutting of coal. The remaining coal pillars at both ends of the working face are cut by the single-drum shearers at both ends through vertical cutting, realizing simultaneous coal mining operations at both ends and in the middle section of the working face, greatly improving the mining efficiency, being beneficial to reducing the number of working face arrangements, reducing the working hours of workers, and increasing the economic benefits of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of the working face layout of the present invention.

[0012] Figure 2 is a schematic diagram of the working face in the initial state of the present invention.

[0013] Figure 3 is a schematic diagram of the working face where the double-drum shearer cuts into the coal wall by diagonal cutting from left to right, and the single-drum shearer on the left cuts into the coal wall vertically from the left roadway.

[0014] Figure 4 is a schematic diagram of the working face after the single-drum shearer on the left cuts through the remaining coal pillar at the left end and returns to cut coal and enters the left roadway.

[0015] Figure 5 is a schematic diagram of the working face where the single-drum shearer on the left cuts into the coal wall vertically again from the left roadway.

[0016] Figure 6 is a schematic diagram of the working face where the double-drum shearer cuts coal from left to right until the length of the remaining coal pillar at the right end of the working face is equal or equivalent to the length of the initial remaining coal pillar at the left end, and the single-drum shearer on the left has cut the remaining coal pillar at the left end and entered the left roadway.

[0017] Figure 7 is a schematic diagram of the working face where the double-drum shearer returns and cuts into the coal wall by diagonal cutting from right to left, and the single-drum shearer on the right cuts into the coal wall vertically from the right roadway.

[0018] Figure 8It is a schematic diagram of the working face after the single-drum shearer on the right side of the present invention cuts through the remaining coal pillar at the right end and returns the cutter to cut coal and enters the roadway at the right end.

[0019] Figure 9 It is a schematic diagram of the working face where the single-drum shearer on the right side of the present invention vertically advances the cutter into the coal wall again from the right roadway.

[0020] Figure 10 It is a schematic diagram of the working face after the single-drum shearer on the right side of the present invention cuts the remaining coal pillar at the right end and enters the right roadway, and the timely support brackets in the middle of the working face follow the scraper conveyor from right to left until they catch up with the double-drum shearer.

[0021] Figure 11 It is a schematic diagram of the working face when the double-drum shearer of the present invention cuts coal from right to left until the length of the remaining coal pillar at the left end of the working face is equal to or equivalent to the length of the initial remaining coal pillar at the left end, and the working face returns to the initial state.

[0022] In the figure: 1. Single-drum shearer; 2. Double-drum shearer; 3. Scraper conveyor; 4. End hydraulic support; 5. Transition hydraulic support; 6. Timely support bracket; 7. Coal wall; 8. Air roadway; 9. Machine roadway; 10. Working face. Detailed implementation manners

[0023] The following further describes the technical solution of the present invention in detail through specific implementation manners.

[0024] As Figures 1 - 11 shown, a hybrid cutting and efficient mining method first opens an air roadway 8, a machine roadway 9 and a cut-through, and then the specific mining steps are as follows: (1) Leave a coal pillar at the left end of the working face 10, and the length of the remaining coal pillar is greater than the length of the single-drum shearer 1. Open a machine pit on the right side of the remaining coal pillar, and the length of the machine pit is not less than the sum of the lengths of the double-drum shearer 2 and the oblique cutting length; (2) Initial state: As Figure 1 and Figure 2 shown, one scraper conveyor 3, several hydraulic supports, two single-drum shearers 1 and one double-drum shearer 2 are arranged on the working face 10. The two single-drum shearers 1 are respectively placed on the scraper conveyor 3 in the roadways (air roadway and machine roadway) at both ends of the working face 10, and the double-drum shearer 2 is placed on the scraper conveyor 3 in the machine pit section. The several hydraulic supports at the head and tail of the scraper conveyor 3 are lagging support brackets (end hydraulic support 4 and transition hydraulic support 5), and the rest of the hydraulic supports are all timely support brackets 6; (3) As Figure 3As shown, the double-drum shearer 2 cuts into the coal wall 7 from left to right at an inclined angle for feed cutting. The immediate support shield 6 in the middle of the working face 10 moves its support to follow the double-drum shearer 2 for roof support (the immediate support shield 6 in the machine sump only needs to push the scraper conveyor). At the same time, the single-drum shearer 1 on the left cuts into the coal wall 7 vertically from the left roadway. The single-drum shearer 1 on the left cuts the remaining coal pillar at the left end from left to right. First, it cuts the top coal. The lag support shield at the left end of the working face 10 extends its telescopic beam for roof support. The immediate support shield 6 at the left end of the working face 10 moves its support for roof support and does not push the scraper conveyor for the time being. (4)As Figure 4 shown, the double-drum shearer 2 continues to cut coal from left to right. The immediate support shield 6 in the middle of the working face 10 moves its support to follow the double-drum shearer 2 for roof support. At the same time, after the single-drum shearer 1 on the left cuts through the remaining coal pillar at the left end, it returns and cuts the remaining coal pillar at the left end from right to left, cutting the bottom coal. The immediate support shield 6 at the left end of the working face 10 follows and pushes the scraper conveyor from right to left and does not move its support for the time being. After the single-drum shearer 1 on the left enters the left roadway, the lag support shield at the left end of the working face 10 pushes the scraper conveyor and then retracts its telescopic beam and moves its support for roof support, making the scraper conveyor 3 pushed to be horizontal as a whole. The single-drum shearer 1 on the left then completes one cycle of cutting the remaining coal pillar at the left end with vertical feed cutting in the roadway. (5)As Figure 5 shown, the double-drum shearer 2 continues to cut coal from left to right. The immediate support shield 6 in the middle of the working face 10 moves its support to follow the double-drum shearer 2 for roof support. At the same time, the single-drum shearer 1 on the left cuts into the coal wall 7 vertically from the left roadway again. The single-drum shearer 1 on the left cuts the remaining coal pillar at the left end from left to right. First, it cuts the top coal. The lag support shield at the left end of the working face 10 extends its telescopic beam for roof support. The immediate support shield 6 at the left end of the working face 10 moves its support for roof support and does not push the scraper conveyor for the time being. (6)As Figure 6 shown, the double-drum shearer 2 continues to cut coal from left to right. The immediate support shield 6 in the middle of the working face 10 moves its support to follow the double-drum shearer 2 for roof support until it cuts to a length of the remaining coal pillar at the right end of the working face 10 equal to or comparable to the initial length of the remaining coal pillar at the left end. At the same time, after the single-drum shearer 1 on the left finishes cutting the remaining coal pillar at the left end and returns and cuts the bottom coal from right to left until it enters the left roadway, the lag support shield at the left end of the working face 10 pushes the scraper conveyor and then retracts its telescopic beam and moves its support for roof support. The immediate support shield 6 follows and pushes the scraper conveyor and does not move its support for the time being. The pushing direction is from left to right until it catches up with the double-drum shearer 2. (7)As Figure 7As shown, the double-drum shearer 2 returns the cutter and cuts into the coal wall 7 obliquely from right to left. The immediate support shield 6 in the middle of the working face 10 moves the shield to follow the double-drum shearer 2 for roof support, and the scraper conveyor is not pushed forward for the time being. At the same time, the single-drum shearer 1 on the right cuts into the coal wall 7 vertically from the right roadway. The single-drum shearer 1 on the right cuts the remaining coal pillar at the right end from right to left. First, it cuts the top coal. The delayed support shield at the right end of the working face 10 extends the telescopic beam for roof support. The immediate support shield 6 at the right end of the working face 10 moves the shield for roof support, and the scraper conveyor is not pushed forward for the time being. (8)As Figure 8 shown, the double-drum shearer 2 continues to cut coal from right to left. The immediate support shield 6 in the middle of the working face 10 moves the shield to follow the double-drum shearer 2 for roof support. At the same time, after the single-drum shearer 1 on the right cuts through the remaining coal pillar at the right end, it returns the cutter and continues to cut the remaining coal pillar at the right end from left to right, cutting the bottom coal. The immediate support shield 6 at the right end of the working face 10 follows the scraper conveyor and is pushed forward from left to right, and the shield is not moved for the time being. After the single-drum shearer 1 on the right enters the right roadway, the delayed support shield at the right end of the working face 10 pushes the scraper conveyor forward and then retracts the telescopic beam and moves the shield for roof support, making the scraper conveyor 3 pushed to a horizontal position as a whole. The single-drum shearer 1 on the right then completes one cycle of the operation of cutting the remaining coal pillar at the right end by vertical roadway cutting. (9)As Figure 9 shown, the double-drum shearer 2 continues to cut coal from right to left. The immediate support shield 6 in the middle of the working face 10 moves the shield to follow the double-drum shearer 2 for roof support. At the same time, the single-drum shearer 1 on the right cuts into the coal wall 7 vertically from the right roadway. The single-drum shearer 1 on the right cuts the remaining coal pillar at the right end from right to left. First, it cuts the top coal. The delayed support shield at the right end of the working face 10 extends the telescopic beam for roof support. The immediate support shield 6 at the right end of the working face 10 moves the shield for roof support, and the scraper conveyor is not pushed forward for the time being. (10)As Figure 10 shown, the double-drum shearer 2 continues to cut coal from right to left. The immediate support shield 6 in the middle of the working face 10 moves the shield to follow the double-drum shearer 2 for roof support. At the same time, after the single-drum shearer 1 on the right finishes cutting the remaining coal pillar at the right end, it returns the cutter and continues to cut the remaining coal pillar at the right end from left to right, cutting the bottom coal. The immediate support shield 6 at the right end of the working face 10 follows the scraper conveyor and is pushed forward from left to right, and the shield is not moved for the time being. After the single-drum shearer 1 on the right enters the right roadway, the delayed support shield at the right end of the working face 10 pushes the scraper conveyor forward and then retracts the telescopic beam and moves the shield for roof support. The immediate support shield 6 follows the scraper conveyor and is pushed forward, and the shield is not moved for the time being. The pushing direction is from right to left until it catches up with the double-drum shearer 2. (11)As Figure 11As shown, the double-drum shearer 2 continues to cut coal from right to left. After the timely support bracket 6 in the middle of the working face 10 moves the support and follows the double-drum shearer 2 to support the roof, it then pushes the scraper conveyor until the length of the remaining coal pillar at the left end of the working face 10 is equal to or equivalent to the length of the initial remaining coal pillar at the left end. At this time, the working face 10 returns to the initial state; (12) Repeat the above steps (3) to (11) to perform left-right symmetric cyclic coal mining operations until the advancement of the entire working face 10 is completed.

[0025] Using the above-mentioned hybrid-knife efficient mining method, when the double-drum shearer 2 runs close to the left or right end of the working face 10, it directly performs reverse diagonal cutting to start the next knife of coal cutting, without the need for the conventional diagonal cutting and then back-and-forth cutting. The remaining coal pillars at both ends of the working face 10 are cut by the single-drum shearers 1 at both ends through vertical cutting, enabling simultaneous coal mining operations at both ends and the middle section of the working face 10, greatly improving the mining efficiency, facilitating the reduction of the number of working face 10 layouts, reducing the working hours of workers, and increasing the economic benefits of the enterprise.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A mixed-feed high-efficiency mining method, firstly, opening a ventilation lane, a machine lane and a cutting hole, characterized in that: then, the specific mining steps are as follows: S1. A coal pillar is left at the left end of the working face. The length of the remaining coal pillar is greater than the length of the single drum coal shearer. A machine nest is opened on the right side of the remaining coal pillar. The length of the machine nest is not less than the sum of the length of the double drum coal shearer and the oblique cutting feed length; S2. In the initial state, the working face is arranged with a scraper conveyor, several hydraulic supports, two single-drum coal mining machines and a double-drum coal mining machine. The two single-drum coal mining machines are placed on the scraper conveyors in the lanes at both ends of the working face, and the double-drum coal mining machine is placed on the scraper conveyor in the machine nest section; S3. The double-drum coal shearer cuts into the coal wall obliquely from left to right, and the hydraulic support frame in the middle of the working face follows the double-drum coal shearer to support the roof, and then the double-drum coal shearer continues to cut coal from left to right until the length of the remaining coal pillar at the right end of the working face is equal to or equivalent to the length of the initial remaining coal pillar at the left end; at the same time, the single-drum coal shearer on the left cuts the remaining coal pillar at the left end by vertically feeding, and during this process, the hydraulic support at the left end of the working face pushes and slides, and the frame follows the single-drum coal shearer on the left to support the roof until the remaining coal pillar at the left end is cut; S4. The double-drum shearer returns and cuts into the coal wall obliquely from right to left, and then continues to cut coal from right to left. The hydraulic support frame in the middle of the working face follows the double-drum shearer to support the roof. At the same time, the single-drum shearer on the right cuts the remaining coal pillar on the right end by vertical cutting. During this process, the hydraulic support on the right end of the working face pushes and slides, and the frame follows the single-drum shearer on the right to support the roof until the remaining coal pillar on the right end is cut. S5. The double-drum coal shearer continues to cut coal from right to left, and the hydraulic support in the middle of the working face follows the double-drum coal shearer to support the roof and then push and slide until the length of the coal pillar left at the left end of the working face is equal to or equivalent to the length of the initial coal pillar left at the left end. At this time, the working face returns to the initial state; S6. Repeat steps S3, S4 and S5 to carry out left-right symmetrical cyclic coal mining operations until the advancement of the entire working face is completed.

2. A mixed feed efficient mining method according to claim 1, characterized in that: Several hydraulic supports located at the head and tail of the scraper conveyor are delayed support supports, and the remaining hydraulic supports are timely support supports.

3. A mixed feed efficient mining method according to claim 2, characterized in that: Step S3 is specifically as follows: the double-drum coal shearer cuts into the coal wall obliquely from left to right, and the timely support bracket in the middle of the working face moves to follow the double-drum coal shearer to support the roof; at the same time, the single-drum coal shearer on the left side cuts into the coal wall vertically from the left end lane, and the single-drum coal shearer on the left side cuts the remaining coal pillar on the left end from left to right, cutting the top coal first, and the delayed support bracket at the left end of the working face extends the telescopic beam to support the roof, and the timely support bracket at the left end of the working face moves to support the roof, and does not push and slide for the time being; The double-drum coal shearer continues to cut coal from left to right, and the timely support bracket in the middle of the working face moves to follow the double-drum coal shearer for roof support; at the same time, after the single-drum coal shearer on the left cuts through the remaining coal pillar at the left end, it returns from right to left to continue cutting the remaining coal pillar at the left end and cuts the bottom coal. The timely support bracket at the left end of the working face follows and slides from right to left without moving the bracket temporarily. After the single-drum coal shearer on the left enters the left end roadway, the delayed support bracket at the left end of the working face pushes and slides, retracts the telescopic beam and moves the bracket for roof support. The single-drum coal shearer on the left then realizes a one-cycle operation of vertically entering the roadway to cut the remaining coal pillar at the left end; The double-drum coal mining machine continues to cut coal from left to right, and the timely support bracket in the middle of the working face moves to follow the double-drum coal mining machine for roof support until the length of the remaining coal pillar at the right end of the working face is equal to or equivalent to the initial length of the remaining coal pillar at the left end; at the same time, the single-drum coal mining machine on the left repeats the cyclic operation of vertically advancing into the tunnel to cut the remaining coal pillar at the left end, until the remaining coal pillar at the left end is cut and enters the left end tunnel, the delayed support bracket at the left end of the working face pushes and slides, retracts the telescopic beam and moves to support the roof, the timely support bracket follows the push and slides, and does not move for the time being, and the pushing direction is from left to right until it catches up with the double-drum coal mining machine.

4. A mixed feed efficient mining method according to claim 2, characterized in that: Step S4 is specifically as follows: the double-drum coal shearer returns and cuts obliquely from right to left into the coal wall, and the timely support bracket in the middle of the working face moves to follow the double-drum coal shearer to support the roof without pushing and sliding; at the same time, the single-drum coal shearer on the right side vertically cuts into the coal wall from the right end lane, and the single-drum coal shearer on the right side cuts the remaining coal pillar on the right end from right to left, cutting the top coal first, and the lagging support bracket at the right end of the working face extends the telescopic beam to support the roof, and the timely support bracket at the right end of the working face moves to support the roof without pushing and sliding; The double-drum coal shearer continues to cut coal from right to left, and the timely support bracket in the middle of the working face moves to follow the double-drum coal shearer for roof support; at the same time, after the single-drum coal shearer on the right cuts through the remaining coal pillar at the right end, it returns from left to right to continue cutting the remaining coal pillar at the right end and cuts the bottom coal. The timely support bracket at the right end of the working face follows and slides from left to right without moving the bracket temporarily. After the single-drum coal shearer on the right enters the right end roadway, the delayed support bracket at the right end of the working face pushes and slides, retracts the telescopic beam and moves the bracket for roof support. The single-drum coal shearer on the right completes a cycle of vertically cutting the remaining coal pillar at the right end of the roadway; The double-drum coal mining machine continues to cut coal from right to left, and the timely support bracket in the middle of the working face moves to follow the double-drum coal mining machine for roof support; at the same time, the single-drum coal mining machine on the right repeats the cyclic operation of vertically advancing into the tunnel to cut the remaining coal pillar on the right end, until the remaining coal pillar on the right end is cut and enters the right end tunnel, the delayed support bracket at the right end of the working face pushes and slides, retracts the telescopic beam and moves to support the roof, the timely support bracket follows the push and slides, and does not move for the time being, and the pushing direction is from right to left until it catches up with the double-drum coal mining machine.

5. A mixed feed efficient mining method according to claim 2, characterized in that: Step S5 is specifically as follows: the double-drum coal mining machine continues to cut coal from right to left, and the timely support bracket in the middle of the working face follows the double-drum coal mining machine to support the roof and then push and slide until the length of the remaining coal pillar at the left end of the working face is equal to or equivalent to the initial remaining coal pillar at the left end. At this time, the working face returns to its initial state.

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