Multi-machine combined efficient mining method for underground bauxite medium-thick seam

Abstract

The present application relates to a kind of underground bauxite medium-thick seam multi-machine combined high-efficiency mining method, specifically: when laying working face, high-grade ore layer is left in the middle of the height direction of the wall, the upper and lower high-grade ore layer of the wall is medium-grade ore layer, the high-grade ore layer and medium-grade ore layer are implemented once mining full height mixed mining operation as target ore layer, the upper and lower medium-grade ore layer forms roof and floor after mining, after the formation of roof, the exposed roof is supported randomly by moving support to the wall side, at least three mining machines are set at the same time interval on the same working face, all mining machines are divided into multiple mining sections, and each mining machine corresponds to a mining section, each mining machine performs continuous two-cut mining operation in the corresponding mining section, and the mining operation time of each mining machine overlaps each other. The present application can significantly improve the mining efficiency and reduce the mining cost.

Description

Technical Field

[0001] This invention relates to a method for mining medium-thick bauxite layers, which is suitable for situations where high-grade ore layers are relatively thick and account for a large proportion of the entire mining face. Background Technology

[0002] Underground bauxite mines contain a large amount of hard materials such as bauxite that need to be mined. Due to the high hardness of the materials, a large cutting force is required, and the cutting head wears out quickly, making cutting difficult. Moreover, the hard rock blocks formed by cutting can easily obstruct or even jam the walking system of the mining machine, greatly affecting the traction system of the mining machine. Therefore, the moving speed of the mining machine is usually much slower than that of the coal mining machine, and the output is correspondingly much smaller, resulting in higher production costs. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-machine combined high-efficiency mining method for medium-thick underground bauxite ore layers, which has high mining efficiency and good economic benefits.

[0004] The main technical solutions of this invention are as follows:

[0005] A multi-machine combined high-efficiency mining method for medium-thick underground bauxite ore layers involves setting up the working face with a high-grade ore layer located in the middle of the ore wall height. Above and below the high-grade ore layer are medium-grade ore layers. A full-height mixed mining operation is carried out using the high-grade and medium-grade ore layers as target ore layers. After mining, the upper and lower medium-grade ore layers form the roof and floor, respectively. After the roof is formed, supports are randomly provided to the exposed roof by pulling supports towards the ore wall. At least three mining machines are simultaneously set up at intervals on the same working face, dividing the working face into multiple mining sections. Each mining machine corresponds to one mining section. Each mining machine performs one round trip and two consecutive cuts within its corresponding mining section. The mining operation times of each mining machine overlap.

[0006] All mining machines are equipped with high-power rocker arms and medium-diameter drums. The drum diameter should be no less than twice the height of the mine wall.

[0007] Ideally, all mining machines should have the same specifications and configuration.

[0008] Furthermore, each mining operation of each mining machine includes a preparation stage and a cutting stage. In the preparation stage, the pushing device moves the conveyor towards the ore wall a certain depth, causing the conveyor to form an S-shaped bend. The corresponding mining machine then cuts into the ore wall through this S-shaped bend. In the cutting stage, the corresponding mining machine moves along the ore wall while simultaneously mining medium- and high-grade ore layers. During the preparation stage, the pushing device pauses after approaching each mining machine, waiting for the corresponding mining machine to cut into the ore wall before resuming its pushing motion. After each mining machine cuts into the ore wall, it directly enters its respective cutting stage.

[0009] The method for efficient multi-machine combined mining of medium-thick underground bauxite ore layers may include the following steps:

[0010] S1. The two ends of the working face are denoted as end A and end B respectively. Mining machines E1, E2 and E3 stop at intervals along the working face in the order from end A to end B. The stopping position at this time is the initial position of each mining machine. Mining machine E1 is between end A and the midpoint D of the working face, mining machine E2 is between the midpoint D of the working face and end B, and mining machine E3 is located at end B.

[0011] S2. The pushing device pushes the conveyor towards the mine wall a distance of one cutting depth. The pushing length is from end A to a point one oblique cutting distance away from mining machine E1. Mining machine E1 travels towards end A for at least one stopping distance plus one oblique cutting distance. At this point, mining machine E1 obliquely cuts into the mine wall. Mining machines E2 and E3 stop and wait.

[0012] S3. Mining machine E1 continues to move towards end A while cutting and loading ore, leveling the top and bottom plates. The support frame follows the direction of movement of mining machine E1 and provides random support for the top plate. Then, the pushing device continues to push the conveyor, and the end point of the push is a slant-cut distance away from mining machine E2. Mining machine E2 moves towards end A for at least one stopping distance plus one slant-cut distance. At this time, mining machine E2 cuts into the ore wall at an angle.

[0013] S4. Mining machines E1 and E2 both move towards end A while cutting and loading ore, leveling the top and bottom plates. The supports follow the movement direction of mining machines E1 and E2 respectively, providing random support to the top plate. Mining machine E1 stops when it reaches end A. The pushing device continues to push the conveyor, and the end point of the push is one oblique cutting distance away from mining machine E3. Mining machine E3 moves towards end A at least one stopping distance plus one oblique cutting distance, at which point mining machine E3 obliquely cuts into the ore wall.

[0014] S5. Mining machine E1 travels towards end B for a stopping distance plus a slant cutting distance and then stops. The pushing device behind mining machine E1 in the direction of travel pushes the conveyor towards the ore wall a cutting depth distance, the pushing length being from end A to a point a slant cutting distance away from mining machine E1; mining machines E2 and E3 continue to travel towards end A while cutting and loading ore, leveling the top and bottom plates. The supports follow closely behind mining machines E2 and E3 in the direction of travel to provide random support for the top plate; the pushing device located behind mining machine E3 in the direction of travel continues to push the conveyor until end B;

[0015] S6. Mining machine E1 moves towards end A until it stops when it reaches end A. At this time, mining machine E1 cuts into the ore wall again at an angle. Mining machines E2 and E3 continue to move towards end A until they cut through the ore wall and stop. While moving, they cut the top plate and bottom plate flat. The supports follow the movement direction of mining machines E2 and E3 to provide random support for the top plate.

[0016] S7. Mining machine E1 moves towards end B while cutting and loading ore, leveling the top and bottom plates. The support frame follows the movement direction of mining machine E1 to provide random support for the top plate. Mining machines E2 and E3 quickly return to end B with empty cutters, with mining machine E2 stopping at its ore wall cutting point. The pushing device continues to push the conveyor, with the end point of the push being one oblique cutting distance from mining machine E2. When mining machine E3 is one stopping distance plus one oblique cutting distance from end B, it begins cutting and loading ore while moving, leveling the top and bottom plates. The support frame follows the movement direction of mining machine E3 to provide random support for the top plate.

[0017] S8. Mining machine E1 continues to move towards end B while cutting and loading ore, leveling the top and bottom plates. The support frame follows the direction of movement of mining machine E1 and provides random support for the top plate. The pushing device behind mining machine E1 moves the conveyor towards the ore wall by a cutting depth, the pushing length being from end A to a point a slant distance away from mining machine E1. Mining machine E2 moves towards end A by a stopping distance plus a slant distance and then stops. At this point, mining machine E2 makes a second slant cut into the ore wall. Mining machine E3 moves to end B and cuts through the top and bottom plates of the end.

[0018] S9. Mining machine E1 continues to move towards end B while cutting and loading ore, leveling the top and bottom plates. The support frame follows the movement direction of mining machine E1 and provides random support for the top plate. The pushing device behind mining machine E1 continues to push the conveyor, maintaining a slant distance between the end point of the push and mining machine E1. The conveyor between mining machine E2 and end B, under the continued pushing of the pushing device, reaches a point one stopping distance plus one slant distance from end B. Mining machine E2 moves towards end B while cutting and loading ore, leveling the top and bottom plates. The support frame follows the movement direction of mining machine E2 and provides random support for the top plate. Mining machine E3 moves from end B towards end A and stops after one stopping distance plus one slant distance. At this time, mining machine E3 makes a second slant cut into the ore wall.

[0019] S10. Mining machine E1 continues to move towards end B until it returns to its initial position and stops. During this movement, it cuts the top and bottom plates flat. The support frame follows the movement direction of mining machine E1 and provides random support for the top plate. The pushing device behind mining machine E1 continues to push the conveyor, maintaining a slant distance between the end point of the push and mining machine E1. Mining machine E2 continues to move towards end B until it returns to its initial position and stops. During this movement, it cuts the top and bottom plates flat. The support frame follows the movement direction of mining machine E2 and provides random support for the top plate. Mining machine E3 returns to end B and cuts the top and bottom plates flat. Then it returns to step S2 to continue the next cycle.

[0020] In step S2, the distance from the mining machine E1 to section A when it cuts obliquely into the ore wall is preferably 1 / 3 of the working face length; in step S3, the distance from the mining machine E2 to section A when it cuts obliquely into the ore wall is preferably 2 / 3 of the working face length.

[0021] The upper limit of the length of the working face is preferably not less than 100m.

[0022] The beneficial effects of this invention are:

[0023] Using three or more mining machines in the same working face for joint mining significantly increases the production capacity of a single face compared to single or double mining operations, while keeping the support and conveyor unchanged, and the economic benefits are also greatly improved.

[0024] Due to increased production capacity and improved utilization of working face equipment, the working face can be significantly lengthened, for example, from the original 100m to 100m-1000m or even longer, which is equivalent to more than one original working face length. This significantly reduces the number of roadways between working faces, thus greatly saving the engineering costs associated with roadway excavation.

[0025] The method of this invention allows for the mixed mining of medium-grade and high-grade ore through a single full-height extraction, while omitting the mining of low-grade ore, thereby achieving the highest mining efficiency and the best economic benefits.

[0026] Since the total thickness of the medium and high grade ore layers is large enough to meet the passage needs of the mining machine, there is no need to cut the low grade ore layers and rock layers at the top and bottom. This not only improves mining efficiency and reduces mining costs by mining the entire height in one go, but also avoids the wear and tear on the mining machine caused by cutting hard rocks and other waste materials, thus improving the working reliability of the mining machine. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the mineral mining process of the present invention;

[0028] Figure 2 A side view of the working face equipment when three mining machines are operating in parallel;

[0029] Figure 3 This is a schematic diagram of the ore wall cutting process (all three mining machines are in their initial positions before cutting begins);

[0030] Figure 4 This is a schematic diagram of the ore wall cutting status (mining machine E1 has completed the first cut, mining machine E2 is performing the first cut, and mining machine E3 is preparing to start the first cut).

[0031] Figure 5This is a schematic diagram of the ore wall cutting status (mining machine E1 starts the second cut, mining machine E2 prepares to execute the second cut, and mining machine E3 is executing the first cut);

[0032] Figure 6 This is a schematic diagram of the ore wall cutting process (mining machines E1, E2, and E3 complete the second cut). Attached image description:

[0034] E1. Mining machine; E2. Mining machine; E3. Mining machine; S. Conveyor; K. Medium and high grade ore; K1. Medium and high grade ore mined in the first cut of a cycle; K2. Medium and high grade ore mined in the second cut of a cycle; F. Waste; Lt. Stop distance; Lx. Inclined cutting distance; T. Pushing device; Z. Support; D. Midpoint of working face;

[0035] : Tow it to this position; : Begin traction from this position; ‖: Stop traction; : Towing (the arrow indicates the direction of traction); The mining machine moves back and forth in a local area to cut ore, level the top and bottom plates, and load the equipment. Detailed Implementation

[0036] This invention discloses a multi-machine combined high-efficiency mining method for medium-thick underground bauxite ore layers. It is a mechanized mining method suitable for working faces with thick high-grade ore layers. For example... Figure 1 , 2 As shown, the main working face equipment required includes a mining machine, a conveyor S, a support Z, and a pushing device T. First, when setting up the working face, the high-grade ore layer is placed in the middle of the mine wall height, with medium-grade ore layers above and below it. A full-height mixed mining operation is carried out using the high-grade and medium-grade ore layers as target ore layers. After mining the upper and lower medium-grade ore layers, a roof and floor are formed, respectively. After the roof is formed, the exposed roof is randomly supported by pulling the support towards the mine wall. Since the total thickness of the medium and high-grade ore layers is large enough to meet the passage requirements of the mining machine, the low-grade ore layers above the upper medium-grade ore layer and the rock layers below the lower medium-grade ore layer are not mined. This not only improves mining efficiency and reduces mining costs through full-height mining, but also avoids wear and tear on the mining machine caused by cutting hard rock and other waste materials, thus improving the reliability of the mining machine. Medium- and high-grade mineral materials K, K1, and K2 are usable materials, while low-grade mineral materials and rocks are considered waste material F. At least three mining machines should be installed simultaneously at intervals on the same working face. Figure 1In the illustrated embodiment, three mining machines are used. All mining machines divide the working face into multiple mining sections, with each mining machine corresponding to a mining section. Each mining machine makes one round trip within its corresponding mining section and performs two consecutive mining operations simultaneously. The mining operation times of each mining machine overlap with each other.

[0037] This invention takes advantage of the fact that the traction speed of mining machines is much lower than that of support pulling and conveyor pushing, and proposes a highly efficient mining method for the joint operation of multiple (three or more) mining machines on one side. By increasing the number of mining machines and investing in corresponding supporting components at a low cost, the production capacity can be increased many times over, and the economic benefits can be significantly improved.

[0038] Based on economic calculations, mining medium-grade ore mixed with high-grade ore without affecting the final ore grade, mining the entire height in one go is the most economical and efficient method.

[0039] All mining machines are equipped with high-power rocker arms and medium-diameter drums. The drum diameter should be no less than twice the height of the mine wall.

[0040] All mining machines should ideally have the same specifications and configurations to facilitate control and management of the operation process.

[0041] Furthermore, each mining operation of each mining machine includes a preparation stage and a cutting stage. In the preparation stage, the pushing device moves the conveyor towards the ore wall a certain depth, causing the conveyor to form an S-shaped bend. The corresponding mining machine then cuts into the ore wall through this S-shaped bend. In the cutting stage, the corresponding mining machine moves along the ore wall while simultaneously mining medium- and high-grade ore layers. During the preparation stage, the pushing device pauses after approaching each mining machine, waiting for the corresponding mining machine to cut into the ore wall before resuming its pushing motion. Each mining machine directly enters its respective cutting stage after cutting into the ore wall. Compared to waiting for all mining machines to cut into the ore wall before entering the cutting stage, this approach is more efficient and time-efficient.

[0042] The following is based on Figure 1 The illustrated embodiment illustrates the implementation process of the multi-machine combined high-efficiency mining method for medium-thick underground bauxite ore layers, which may include the following steps:

[0043] S1. The two ends of the working face are designated as end A and end B (in this embodiment, they can correspond to the left and right ends of the working face shown in the diagram, respectively). Mining machines E1, E2, and E3 stop sequentially along the working face from end A to end B, preparing to start a new cut. The stopping positions at this time are the initial positions of each mining machine, with mining machine E1 between end A and the midpoint D of the working face, mining machine E2 between the midpoint D and end B, and mining machine E3 located at end B. At this time, the distribution of medium and high-grade ore layers on the ore wall is as follows: Figure 3 As shown. When the mining machine is stopped, it occupies a distance Lt, which is called the stopping distance.

[0044] S2. The pushing device pushes the conveyor towards the mine wall a distance of one cutting depth. The pushing length is from end A to a point one oblique cutting distance (the distance the mining machine travels along the mine wall during its oblique cutting entry, denoted as Lx) away from mining machine E1. After the pushing, the conveyor forms an S-shaped bend for the first time in one cycle. This S-shaped bend prepares the mining machine E1 for its first oblique cutting into the mine wall in one cycle. Mining machine E1 travels towards end A for at least one stopping distance plus one oblique cutting distance. At this point, mining machine E1 obliquely cuts into the mine wall and begins its first cut. Mining machines E2 and E3 stop and wait.

[0045] S3. Mining machine E1 continues to move towards end A while cutting and loading ore, leveling the top and bottom plates. The support frame follows the movement direction of mining machine E1, providing random support for the top plate. Then, the pushing device continues to push the conveyor (the so-called "continuing to push the conveyor" means using the previous end point as the starting point of this push, and maintaining the same unidirectional pushing sequence from one end of the working face to the other, pushing the conveyor towards the ore wall a cutting depth distance). The end point of the push is a slant-cut distance away from mining machine E2. Mining machine E2 moves towards end A at least one stopping distance plus one slant-cut distance. At this point, mining machine E2 cuts into the ore wall at an angle and begins the first cut. This position is called the ore wall entry point of mining machine E2. Mining machine E3 continues to stop and wait.

[0046] S4. Mining machines E1 and E2 both move towards end A, simultaneously cutting and loading ore, leveling the top and bottom plates. Supports follow closely behind the moving directions of mining machines E1 and E2, providing random support to the top plate. Mining machine E1 stops when it reaches end A, completing the first cut. The pushing device continues to push the conveyor, with the endpoint of the push being one oblique cutting distance from mining machine E3. Mining machine E3 moves towards end A at least one stopping distance plus one oblique cutting distance. At this point, mining machine E3 obliquely cuts into the ore wall, and mining machine E3 begins its first cut. The ore wall mining situation at this time can be seen in [reference needed]. Figure 4 .

[0047] S5. Mining machine E1 travels towards end B for a stopping distance plus a diagonal cutting distance and then stops. The pushing device behind mining machine E1 in its travel direction pushes the conveyor towards the ore wall a cutting depth distance, from end A to a point a diagonal cutting distance away from mining machine E1, causing the conveyor to form an S-shaped bend again. This S-shaped bend prepares the track for mining machine E1 to diagonally cut into the ore wall when it makes its second cut. Mining machines E2 and E3 continue to travel towards end A while cutting and loading ore, leveling the top and bottom plates. The supports follow the travel direction of mining machines E2 and E3 respectively, providing random support for the top plate. The pushing device behind mining machine E3 in its travel direction continues to push the conveyor until end B, that is, straightening the conveyor.

[0048] S6. Mining machine E1 moves towards end A until it reaches end A and stops. At this point, mining machine E1 again cuts diagonally into the ore wall, preparing for the second cut. Mining machines E2 and E3 continue moving towards end A until they cut through the ore wall and stop. While moving, they level the top and bottom plates. The supports follow the movement of mining machines E2 and E3, providing random support to the top plate. The first cut of mining machine E2 is completed.

[0049] S7. Mining machine E1 moves towards end B while simultaneously cutting and loading ore, performing its second cut to level the top and bottom plates. The support frame follows the movement direction of mining machine E1, providing random support to the top plate. Mining machines E2 and E3 quickly return to end B empty, with mining machine E2 stopping at its ore wall entry point. The pushing device continues to push the conveyor, with the endpoint of the push being one oblique cutting distance from mining machine E2. When mining machine E3 is one stopping distance plus one oblique cutting distance from end B, it begins cutting and loading ore while moving, leveling the top and bottom plates. The support frame follows the movement direction of mining machine E3, providing random support to the top plate. The ore wall mining situation at this time can be seen in [reference needed]. Figure 5 .

[0050] S8. Mining machine E1 continues to move towards end B while cutting and loading ore, leveling the top and bottom plates. The support frame follows closely behind the direction of movement of mining machine E1, providing random support for the top plate. The pushing device behind mining machine E1 pushes the conveyor towards the ore wall a certain depth, the pushing length being from end A to a point a certain oblique cutting distance away from mining machine E1, causing the conveyor to form a third S-shaped bend. This S-shaped bend prepares the track for mining machine E1 to make its first cut into the ore wall in the next cycle. Mining machine E2 moves towards end A for a stopping distance plus an oblique cutting distance and then stops. At this point, mining machine E2 makes its second oblique cut into the ore wall, preparing for the second cut. Mining machine E3 moves to end B and cuts through the top and bottom plates of the end, thus completing the first cut of mining machine E3.

[0051] S9. Mining machine E1 continues to move towards end B while cutting and loading ore, leveling the top and bottom plates. The support frame follows the movement direction of mining machine E1 to provide random support for the top plate. The pushing device behind mining machine E1 continues to push the conveyor, maintaining a slant distance between the end point of the push and mining machine E1. The conveyor between mining machine E2 and end B is pushed by the pushing device until the end point reaches a distance of one stopping distance plus one slant distance from end B. Mining machine E2 moves towards end B while cutting and loading ore, leveling the top and bottom plates. The support frame follows the movement direction of mining machine E2 to provide random support for the top plate. Mining machine E3 moves from end B to end A and stops after one stopping distance plus one slant distance. At this time, mining machine E3 makes a second slant cut into the ore wall, preparing for the second cut.

[0052] S10. Mining machine E1 continues to move towards end B until it returns to its initial position and stops. During this movement, it cuts the top and bottom plates flat. The support frame follows the movement direction of mining machine E1 and provides random support for the top plate. The pushing device behind mining machine E1 continues to push the conveyor, maintaining a slant distance between the end point of the push and mining machine E1. Mining machine E2 continues to move towards end B until it returns to its initial position and stops. During this movement, it cuts the top and bottom plates flat. The support frame follows the movement direction of mining machine E2 and provides random support for the top plate. Mining machine E3 returns to end B and cuts the top and bottom plates flat. The second cut of mining machines E1, E2, and E3 is completed. The mining status of the ore wall at this time can be seen in [reference needed]. Figure 6 Then return to step S2 to continue the next loop.

[0053] Mining machines E1, E2, and E3 are each responsible for mining a section of the mine wall, and their mining processes overlap in time, so their mining efficiency is significantly higher than that of a single or dual mining machine.

[0054] This invention solves the problem of connection between two adjacent cycles in the mining process by allowing each mining machine to move from its initial position to the other end of the ore wall section it is responsible for and then back to its initial position through two feeds in one cycle.

[0055] In step S2, the distance from the mining machine E1 to section A when it cuts obliquely into the ore wall is preferably 1 / 3 of the working face length; in step S3, the distance from the mining machine E2 to section A when it cuts obliquely into the ore wall is preferably 2 / 3 of the working face length, so that the lengths of each mining section are as close to equal as possible, ensuring that each mining machine mines synchronously and minimizing the extra waiting time of any mining machine due to asynchrony.

[0056] The upper limit of the length of the working face is preferably not less than 100m, for example, 100-1000m, or even longer. Compared with the original 100m, the number of roadways between the mine walls can be greatly reduced, thus greatly saving the engineering cost corresponding to the amount of roadway excavation.

Claims

1. A multi-machine combined high-efficiency mining method for medium-thick underground bauxite ore layers, characterized in that: When setting up the working face, the high-grade ore layer is left in the middle of the mine wall height direction. Above and below the high-grade ore layer are medium-grade ore layers. A full-height mixed mining operation is carried out using the high-grade and medium-grade ore layers as the target ore layers. After mining, the upper and lower medium-grade ore layers form the roof and floor respectively. After the roof is formed, the exposed roof is randomly supported by pulling the supports towards the mine wall side. Three mining machines are simultaneously set up at intervals on the same working face. All mining machines divide the working face into multiple mining sections, with each mining machine corresponding to a mining section. Each mining machine performs one round trip and two consecutive cuts within its corresponding mining section. The mining operation times of each mining machine overlap, including the following steps: S1. The two ends of the working face are denoted as end A and end B respectively. Mining machines E1, E2 and E3 stop at intervals along the working face in the order from end A to end B. The stopping position at this time is the initial position of each mining machine. Mining machine E1 is between end A and the midpoint D of the working face, mining machine E2 is between the midpoint D of the working face and end B, and mining machine E3 is located at end B. S2. The pushing device pushes the conveyor towards the mine wall a distance of one cutting depth. The pushing length is from end A to a point one oblique cutting distance away from mining machine E1. Mining machine E1 travels towards end A for at least one stopping distance plus one oblique cutting distance. At this point, mining machine E1 obliquely cuts into the mine wall. Mining machines E2 and E3 stop and wait. S3. Mining machine E1 continues to move towards end A while cutting and loading ore, leveling the top and bottom plates. The support frame follows the direction of movement of mining machine E1 to provide random support for the top plate. Then, the pushing device continues to push the conveyor, and the end point of the push is a slant distance away from mining machine E2. Mining machine E2 moves towards end A for at least one stopping distance plus one slant distance. At this point, mining machine E2 cuts into the ore wall at an angle. This position is called the ore wall entry point of mining machine E2. Mining machine E3 continues to stop and wait. S4. Mining machines E1 and E2 both move towards end A while cutting and loading ore, leveling the top and bottom plates. The supports follow the movement direction of mining machines E1 and E2 respectively, providing random support to the top plate. Mining machine E1 stops when it reaches end A. The pushing device continues to push the conveyor, and the end point of the push is one oblique cutting distance away from mining machine E3. Mining machine E3 moves towards end A at least one stopping distance plus one oblique cutting distance, at which point mining machine E3 obliquely cuts into the ore wall. S5. Mining machine E1 travels towards end B for a stopping distance plus a slant cutting distance and then stops. The pushing device behind mining machine E1 in the direction of travel pushes the conveyor towards the ore wall a cutting depth distance, the pushing length being from end A to a point a slant cutting distance away from mining machine E1; mining machines E2 and E3 continue to travel towards end A while cutting and loading ore, leveling the top and bottom plates. The supports follow closely behind mining machines E2 and E3 in the direction of travel to provide random support for the top plate; the pushing device located behind mining machine E3 in the direction of travel continues to push the conveyor until end B; S6. Mining machine E1 moves towards end A until it stops when it reaches end A. At this time, mining machine E1 cuts into the ore wall again at an angle. Mining machines E2 and E3 continue to move towards end A until they cut through the ore wall and stop. While moving, they cut the top plate and bottom plate flat. The supports follow the movement direction of mining machines E2 and E3 to provide random support for the top plate. S7. Mining machine E1 moves towards end B while cutting and loading ore, leveling the top and bottom plates. The support frame follows the movement direction of mining machine E1 to provide random support for the top plate. Mining machines E2 and E3 quickly return to end B with empty cutters, with mining machine E2 stopping at its ore wall cutting point. The pushing device continues to push the conveyor, with the end point of the push being one oblique cutting distance from mining machine E2. When mining machine E3 is one stopping distance plus one oblique cutting distance from end B, it begins cutting and loading ore while moving, leveling the top and bottom plates. The support frame follows the movement direction of mining machine E3 to provide random support for the top plate. S8. Mining machine E1 continues to move towards end B while cutting and loading ore, leveling the top and bottom plates. The support frame follows the direction of movement of mining machine E1 and provides random support for the top plate. The pushing device behind mining machine E1 moves the conveyor towards the ore wall by a cutting depth, the pushing length being from end A to a point a slant distance away from mining machine E1. Mining machine E2 moves towards end A by a stopping distance plus a slant distance and then stops. At this point, mining machine E2 makes a second slant cut into the ore wall. Mining machine E3 moves to end B and cuts through the top and bottom plates of the end. S9. Mining machine E1 continues to move towards end B while cutting and loading ore, leveling the top and bottom plates. The support frame follows the movement direction of mining machine E1 and provides random support for the top plate. The pushing device behind mining machine E1 continues to push the conveyor, maintaining a slant distance between the end point of the push and mining machine E1. The conveyor between mining machine E2 and end B, under the continued pushing of the pushing device, reaches a point one stopping distance plus one slant distance from end B. Mining machine E2 moves towards end B while cutting and loading ore, leveling the top and bottom plates. The support frame follows the movement direction of mining machine E2 and provides random support for the top plate. Mining machine E3 moves from end B towards end A and stops after one stopping distance plus one slant distance. At this time, mining machine E3 makes a second slant cut into the ore wall. S10. Mining machine E1 continues to move towards end B until it returns to its initial position and stops. During this movement, it cuts the top and bottom plates flat. The support frame follows the movement direction of mining machine E1 and provides random support for the top plate. The pushing device behind mining machine E1 continues to push the conveyor, maintaining a slant distance between the end point of the push and mining machine E1. Mining machine E2 continues to move towards end B until it returns to its initial position and stops. During this movement, it cuts the top and bottom plates flat. The support frame follows the movement direction of mining machine E2 and provides random support for the top plate. Mining machine E3 returns to end B and cuts the top and bottom plates flat. Then it returns to step S2 to continue the next cycle.

2. The method for efficient multi-machine combined mining of medium-thick underground bauxite strata as described in claim 1, characterized in that: All mining machines are equipped with high-power rocker arms and medium-diameter drums. The drum diameter should be no less than twice the height of the mine wall.

3. The method for efficient multi-machine combined mining of medium-thick underground bauxite strata as described in claim 2, characterized in that: All mining machines have the same specifications and configurations.

4. The method for efficient multi-machine combined mining of medium-thick underground bauxite ore layers as described in claims 1, 2, or 3, characterized in that: In step S2, when the mining machine E1 cuts into the ore wall at an angle, the distance to section A is 1 / 3 of the working face length; in step S3, when the mining machine E2 cuts into the ore wall at an angle, the distance to section A is 2 / 3 of the working face length.

5. The method for efficient multi-machine combined mining of medium-thick underground bauxite strata as described in claim 1, 2, or 3, characterized in that: The maximum length of the working face shall not be less than 100m.

6. The method for efficient multi-machine combined mining of medium-thick underground bauxite strata as described in claim 4, characterized in that: The maximum length of the working face shall not be less than 100m.

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