Method for separating ore materials by multiple machines in combination

Abstract

The present application relates to a kind of mining material separate mining method of multi-machine combination, specifically: when laying working face, high-grade ore layer is left in the middle or upper middle of the height direction of ore wall, the top waste layer and the bottom waste layer are respectively above and below the high-grade ore layer of ore wall, the top waste layer is low-grade ore layer, the bottom waste layer includes adjacent low-grade ore layer and rock layer, at least three mining machines are set at the same time interval on the same working face, all mining machines first parallel mining high-grade ore layer, then parallel cutting top and bottom waste layer, top waste layer forms roof after cutting, bottom waste layer forms floor after cutting, all mining machines are matched with high-power rocker arm and medium-diameter drum, the diameter of drum is adapted to the thickness of high-grade ore layer.The present application can significantly improve mining efficiency and reduce mining cost.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of ore material separate mining process, especially suitable for the mining of underground bauxite with medium-high grade ore material layer thickness, good or very good working face roof condition. BACKGROUND

[0002] There are a large amount of hard materials such as bauxite rock in underground bauxite that need to be mined. Due to the high hardness of the material, a large cutting force is required, and the cutting head is also quickly worn out, so the cutting difficulty is great. Hard rock blocks formed by cutting can also hinder or even jam the walking system of the mining machine, and have a great impact on 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 also much smaller, resulting in high production cost. SUMMARY

[0003] The purpose of the present application is to provide a multi-machine combined ore material separate mining method to improve the mining efficiency and reduce the mining cost.

[0004] The main technical solution of the present application is as follows:

[0005] A multi-machine combined ore material separate mining method, when laying out the working face, the medium-high grade ore material layer is left in the middle or upper part of the height direction of the ore wall. The top and bottom of the medium-high grade ore material layer of the ore wall are the top and bottom waste material layers, respectively. The top waste material layer is a low-grade ore material layer, and the bottom waste material layer includes an upper and lower adjacent low-grade ore material layer and a rock layer. At least three mining machines are arranged at the same time interval on the same working face. All mining machines first mine the medium-high grade ore material layer in parallel, and then cut off the top and bottom waste material layers in parallel. The top waste material layer forms a roof after cutting, and the bottom waste material layer forms a floor after cutting.

[0006] All mining machines are equipped with high-power rocker arms and medium-diameter drums. The diameter of the drum is suitable for the thickness of the medium-high grade ore material layer.

[0007] The cut medium-high grade ore material and waste material are transported by the same conveyor at different times. The waste material is the top waste material and / or the bottom waste material. The top waste material is a low-grade ore material, and the bottom waste material is a mixture of low-grade ore material and rock or low-grade ore material.

[0008] The specifications and configurations of all mining machines are preferably the same.

[0009] When the working face is a large-inclination working face, the mining machines control the mining of the medium-high grade ore material layer from low to high in parallel, and the cutting of the top and bottom waste material layers from high to low in parallel.

[0010] The mining operation of each mining machine includes three stages of preparation, cutting ore and cutting rock. In the preparation stage, the pushing device pushes the conveyor towards the mine wall by a distance of a cutting depth, forming an S-shaped bending, and the corresponding mining machine is obliquely cut into the mine wall through the S-shaped bending. In the cutting ore stage, the corresponding mining machine continues to walk along the mine wall while mining the medium-high grade ore layer. In the cutting rock stage, the corresponding mining machine reverses and cuts off the top and bottom waste layers. In the preparation stage, the pushing device pauses after approaching each mining machine, waits for the corresponding mining machine to obliquely cut into the mine wall and stop, and then resumes pushing. After all the mining machines are sequentially obliquely cut into the mine wall, they enter the cutting ore stage simultaneously.

[0011] The multi-machine combined ore mining method can include the following steps:

[0012] S1. The two ends of the working face are marked as A end and B end respectively, and the mining machines E1, E2 and E3 are sequentially and spacedly parked in the direction from A end to B end, the mining machine E1 is parked between A end and the midpoint D of the working face, the mining machine E2 is parked between the midpoint D of the working face and B end, and the mining machine E3 is parked at B end. At this time, the parking position is the initial position of each mining machine. For a large-dip-angle working face, the higher end is taken as A end and the lower end is taken as B end.

[0013] S2. The pushing device pushes the conveyor towards the mine wall by a distance of a cutting depth, and the pushing length is from A end to a position at a cutting distance from the mining machine E1. Then the mining machine E1 walks towards A end by a stop distance plus a cutting distance and stops, at this time the mining machine E1 is obliquely cut into the mine wall, which is called the mine wall cutting-in point position of the mining machine E1. The mining machines E2 and E3 stop and wait.

[0014] S3. The mining machines E1 and E3 stop and wait; the pushing device continues to push the conveyor, and the terminal point of the pushing is at a cutting distance from the mining machine E2. The mining machine E2 walks towards A end by a stop distance plus a cutting distance and stops, at this time the mining machine E2 is obliquely cut into the mine wall, which is called the mine wall cutting-in point position of the mining machine E2.

[0015] S4. The mining machines E1 and E2 stop and wait; the pushing device continues to push the conveyor, and the terminal point of the pushing is at a cutting distance from the mining machine E3. The mining machine E3 walks towards A end by a stop distance plus a cutting distance and stops, at this time the mining machine E3 is obliquely cut into the mine wall.

[0016] S5. The mining machines E1, E2 and E3 stop and wait; the pushing device continues to push the conveyor until B end.

[0017] S6. The mining machines E1 and E2 walk towards A end, and the mining machine E3 first walks towards B end, then returns to A end after reaching B end, and all the mining machines walk while mining the medium-high grade ore layer, wherein the mining machine E1 stops when walking to A end.

[0018] S7. Mining machine E1 stops after walking a stop distance to B end, and the middle-high grade ore layer is cut and loaded during walking, mining machines E2 and E3 continue to walk to A end, and the middle-high grade ore layer is mined during walking;

[0019] S8. Mining machine E1 continues to stop and wait, mining machine E2 stops when walking to the mining wall cutting point position of mining machine E1, mining machine E3 continues to walk to A end, and the middle-high grade ore layer is mined during walking;

[0020] S9. Mining machines E1 and E2 continue to stop and wait, mining machine E3 stops when walking to the mining wall cutting point position of mining machine E2, and the middle-high grade ore layer is mined during walking;

[0021] S10. The rocking arm height of mining machines E1, E2 and E3 is adjusted, so that the two rocking arms of each mining machine are aligned with the top waste layer and the bottom waste layer respectively, mining machine E1 stops at A end, mining machines E2 and E3 walk to B end, and the top and bottom waste layers are cut by the three mining machines during walking;

[0022] S11. Mining machines E1, E2 and E3 walk to B end while cutting the top and bottom waste layers; mining machine E1 stops at a stop distance in front of the mining wall cutting point position of mining machine E1 plus a bevel cutting distance; the pushing device pushes the conveyor to the mining wall by a cutting depth, and the pushing length is from A end to a bevel cutting distance away from mining machine E1; mining machines E2 and E3 stop respectively when walking to the mining wall cutting point position of mining machine E2 and B end;

[0023] S12. Mining machine E1 walks to the mining wall cutting point position of mining machine E1 after walking a stop distance plus a bevel cutting distance to A end and stops, at this time mining machine E1 bevels into the mining wall; mining machine E2 stops at a stop distance in front of the mining wall cutting point position of mining machine E2 plus a bevel cutting distance, the pushing device continues to push the conveyor, and the terminal point of pushing is a bevel cutting distance away from mining machine E2; mining machine E2 walks to the mining wall cutting point position of mining machine E2 after walking a stop distance plus a bevel cutting distance to A end and stops, at this time mining machine E2 bevels into the mining wall; mining machine E3 stops at B end; return to step S4 to prepare for the next cut mining.

[0024] In steps S10 and S11, the exposed roof formed after cutting the top waste layer is randomly supported by the support following each mining machine.

[0025] The upper limit value of the length of the working face is preferably not less than 100 m.

[0026] The beneficial effects of the present application are:

[0027] Using three or more mining machines in the same working face for joint mining greatly increases the single-face production capacity and significantly improves economic benefits, provided that the support and conveyor remain unchanged.

[0028] 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.

[0029] In response to the distribution characteristics of medium-to-high grade mineral layers with moderate thickness, characterized by "low mineral hardness and high bottom rock hardness", this invention employs a large mining machine and a medium-diameter drum adapted to the thickness of medium-to-high grade mineral layers to cut and load minerals and waste. This fully utilizes the capabilities of the equipment and helps ensure its reliability. At the same time, it also ensures the grade of the mined minerals and greatly improves mining efficiency.

[0030] With the total mining height remaining unchanged, this invention reduces the amount of rock that the mining machine cuts below the medium-to-high-grade mineral layer by mining the relatively low-grade mineral layer above the medium-to-high-grade mineral layer as top waste. This reduces the wear and tear on the mining machine and improves its operational reliability.

[0031] For steeply inclined working faces, the cutting of harder rocks is mainly arranged when the mining machine is descending. This can make full use of the mining machine's gravity, reduce traction consumption, and significantly reduce wear and tear on the mining machine's traction system. Attached Figure Description

[0032] Figure 1 A schematic diagram of the ore extraction process of the present invention when three mining machines of the same specifications and configuration are set up on the same working face;

[0033] Figure 2 A side view of the working face equipment when three mining machines are mining medium- to high-grade mineral layers in parallel;

[0034] Figure 3 A side view of the working face equipment when three mining machines are cutting the top and bottom waste layers in parallel;

[0035] Figure 4 This is a schematic diagram of the ore wall cutting process (all three mining machines are in their initial positions before cutting begins);

[0036] Figure 5 This is a schematic diagram of the ore wall cutting process (three mining machines are mining the medium-to-high grade ore layer in parallel from low to high).

[0037] Figure 6This is a schematic diagram of the mine wall cutting process (three mining machines are cutting the top and bottom waste layers in parallel from high to low and providing support).

[0038] Figure 7 This is a schematic diagram of the ore wall cutting process (the entire ore wall has been mined, and the three mining machines have returned to their respective initial positions). Attached image description:

[0040] E1. Mining machine; E2. Mining machine; E3. Mining machine; S. Conveyor; K. Medium- to high-grade ore; F. Waste (referring to low-grade ore or a mixture of low-grade ore and rock); Lt. Stopping distance; Lx. Inclined cutting distance; T. Pushing device; Z. Support; D. Midpoint of working face;

[0041] Towed to that position; Towing begins from this position; ||: Towing stops. Towing (the arrow indicates the direction of traction). Detailed Implementation

[0042] This invention discloses a multi-machine combined ore mining method, a mechanized mining method suitable for working faces with moderately thick medium-to-high grade ore layers and good or very good roof conditions. Figures 1-3 As shown, the main working face equipment required includes mining machines, conveyors S, supports Z, and moving devices T. First, when setting up the working face, the medium-to-high grade ore layer should be placed in the middle or upper-middle part of the mine wall height. Above and below the medium-to-high grade ore layer are the top waste layer and bottom waste layer, respectively. The top waste layer is a low-grade ore layer, and the bottom waste layer includes adjacent low-grade ore layers and rock layers. The medium-to-high grade ore K is usable ore, while the low-grade ore and rock are both waste F. At least three mining machines are simultaneously set up at intervals on the same working face. All mining machines first mine the medium-to-high grade ore layer in parallel, and then cut off the top and bottom waste layers in parallel. After the top waste layer is cut off, the roof is formed, and after the bottom waste layer is cut off, the bottom is formed.

[0043] 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.

[0044] All mining machines are matched with high-power rocker arms, medium (or medium-small) diameter drums, and the drum diameter should be adapted to the thickness of the medium-high grade ore layer. The so-called adaptation means that the drum diameter is smaller than but close to the thickness of the medium-high grade ore layer, and the diameter that is too small will affect the mining efficiency, and the diameter that is too large will mix in low-grade ore. In view of the distribution characteristics of the medium-high grade ore layer with medium thickness, i.e. the hardness of the ore is relatively low, and the hardness of the bottom rock layer is high, the present application uses a large mining machine, a medium diameter drum adapted to the thickness of the medium-high grade ore layer to cut and load the ore and waste, which not only fully utilizes the capacity characteristics of the equipment, but also is beneficial to ensure the reliability of the equipment, and also ensures the grade of the mined ore, greatly improving the mining efficiency.

[0045] In the case of the total mining height being unchanged, the present application can reduce the cutting amount of the mining machine on the rock with relatively high hardness located below the medium-high grade ore layer by mining the low-grade ore layer with relatively low hardness above the medium-high grade ore layer as the top waste, so that the wear of the mining machine can be reduced, and the working reliability of the mining machine can be improved.

[0046] The cut medium-high grade ore and waste are transported by the same conveyor at different times, and can reach different conveying endpoints, i.e. the ore bin, so as to ensure the grade of the ore. The waste is the top waste and / or the bottom waste, the top waste is the low-grade ore, and the bottom waste is the mixture of the low-grade ore and rock or the low-grade ore. If the low-grade ore layer located below the medium-high grade ore layer is thick enough, the rock layer does not need to be mined, and in this case, the bottom waste is only the low-grade ore.

[0047] The specifications and configurations of all mining machines are preferably the same, so as to facilitate the control and management of the operation process.

[0048] Further, the mining operation of each mining machine includes three stages of preparation, ore cutting and rock cutting. In the preparation stage, the pushing device pushes the conveyor to the mine wall by a cutting depth, forming an S-shaped bend, and the corresponding mining machine cuts into the mine wall through the S-shaped bend. In the ore cutting stage, the corresponding mining machine continues to walk along the mine wall while mining the medium-high grade ore layer. In the rock cutting stage, the corresponding mining machine walks reversely while cutting off the top and bottom waste layers. In the preparation stage, the pushing device pauses after approaching each mining machine, waits for the corresponding mining machine to cut into the mine wall and stop, and then resumes pushing. After all the mining machines cut into the mine wall in turn, they enter the ore cutting stage at the same time.

[0049] The ore mining method of the multi-machine combination can be used for large inclination working faces, in which case the mining machines are preferably controlled to mine the medium-high grade ore layer from low to high, and to cut off the top and bottom waste layers from high to low.

[0050] The following will be described by taking Figure 1The embodiment is used to illustrate the implementation process of the method, which can include the following steps:

[0051] S1. The two ends of the working face are marked as A end and B end (in this embodiment, they can correspond to the left end and the right end of the illustrated working face, respectively). The mining machines E1, E2 and E3 are parked in sequence in the direction from the A end to the B end at intervals, and are ready to start a new cut. The specific positions are: the mining machine E1 is parked between the A end and the midpoint D of the working face, the mining machine E2 is parked between the midpoint D of the working face and the B end, and the mining machine E3 is parked at the B end. At this time, the parking positions are the initial positions of the mining machines. At this time, the distribution of the high-grade ore layer and the waste layer on the mine wall is as shown in the figure. Figure 4 The mining machine occupies a distance Lt in the stopped state, which is called the parking distance.

[0052] For a large-dip-angle working face, the higher end is preferably taken as the A end, and the lower end is taken as the B end.

[0053] S2. The pushing device pushes the conveyor towards the mine wall by a distance of a section depth, and the pushing length is from the A end to a position at a distance of a bevel cutting distance (which refers to the distance of the mining machine walking along the mine wall when it is bevel cut into the cut, and is denoted as Lx) from the mining machine E1. After the pushing, the conveyor will form an S-shaped curve, which is a preparation for the mining machine E1 to bevel cut into the mine wall on the track. Then the mining machine E1 walks towards the A end by a parking distance plus a bevel cutting distance and stops, at which time the mining machine E1 is bevel cut into the mine wall, and this position is called the mine wall cut-in point position of the mining machine E1. The mining machines E2 and E3 stop and wait. In this step, as the conveyor chute is pushed towards the mine wall, part of the float is squeezed towards the mine wall, the float that is too high slides into the conveying groove, and the remaining float is piled up above the front and rear of the shovel plate, providing a bottom cushion and guidance for the subsequent high-grade ore to slide into the conveying groove, which realizes the shovel loading of waste. For the first cut mining, the shovel-loaded waste is mainly the waste of the mine wall collapse, and for the subsequent cut mining, the shovel-loaded waste also includes the waste generated in the previous cut mining process.

[0054] S3. The mining machines E1 and E3 stop and wait; the pushing device continues to push the conveyor (the so-called continued pushing of the conveyor refers to taking the end point of the previous pushing as the starting point of this time, and keeping the same one-way pushing sequence from one end of the working face to the other end to push the conveyor towards the mine wall by a distance of a section depth), and the end point of the pushing is at a distance of a bevel cutting distance from the mining machine E2. The conveyor continues to shovel the waste during the pushing; the mining machine E2 walks towards the A end by a parking distance plus a bevel cutting distance and stops, at which time the mining machine E2 is bevel cut into the mine wall, and this position is called the mine wall cut-in point position of the mining machine E2.

[0055] S4. Mining machines E1 and E2 stop and wait; 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. During the pushing process, the conveyor continues to shovel and load waste; mining machine E3 moves towards end A by one stopping distance plus one oblique cutting distance and then stops. At this time, mining machine E3 obliquely cuts into the mine wall.

[0056] S5. Mining machines E1, E2, and E3 stop and wait; the pushing device continues to push the conveyor to end B, that is, to flatten the conveyor and eliminate the S-shaped bend, and the conveyor is finished loading waste.

[0057] Steps S1-S5 are the preparation stage. The pushing device pushes the conveyor towards the mine wall by a cutting depth, and each mining machine cuts into the mine wall obliquely in sequence, which prepares for mining the high-grade ore layer.

[0058] S6. Mining machines E1 and E2 move towards point A, while mining machine E3 first moves towards point B, then turns back towards point A. All mining machines move simultaneously, mining the medium-to-high grade ore layer (see...). Figure 2 Mining machine E1 stops when it reaches end A.

[0059] S7. Mining machine E1 moves to end B and then stops. During the movement, it cuts and fills the medium and high grade ore layer cleanly. Mining machines E2 and E3 continue to move to end A, mining the medium and high grade ore layer at the same time.

[0060] S8. Mining machine E1 continues to stop and wait. Mining machine E2 stops when it reaches the cutting point of the ore wall of mining machine E1. Mining machine E3 continues to move towards end A, mining the medium and high grade ore layer while moving.

[0061] S9. Mining machines E1 and E2 remain stationary and wait. Mining machine E3 stops when it reaches the cut-in point of the ore wall from mining machine E2, and continues mining the medium-to-high grade ore layer while moving. By this step, the medium-to-high grade ore layer is essentially mined out. The ore wall condition can be referenced. Figure 5 .

[0062] Steps S6-S9 constitute the ore cutting stage, where three mining machines simultaneously mine the medium-to-high-grade ore layer, significantly increasing production efficiency. Due to favorable roof conditions, no support is implemented immediately after the medium-to-high-grade ore is mined separately, but this does not affect the safety of the working face.

[0063] S10. Adjust the boom heights of mining machines E1, E2, and E3 so that the two booms of each mining machine are aligned with the top and bottom scrap layers respectively (see...). Figure 3 Mining machine E1 stops at point A, while mining machines E2 and E3 move towards point B (i.e., downwards). Simultaneously, all three mining machines remove the top and bottom waste layers. The condition of the mine wall can be referenced. Figure 6 .

[0064] S11. The mining machines E1, E2 and E3 cut the top and bottom waste layers while walking towards the B end; the mining machine E1 stops at a stop distance plus an oblique cutting distance in front of the mining wall cutting-in point position of the mining machine E1 (in front of the walking direction of the mining machine E1, the same below); the pushing device pushes the conveyer towards the mining wall by a cutting depth distance, the pushing length is from the A end to a position which is an oblique cutting distance away from the mining machine E1 ; the mining machines E2 and E3 stop respectively at the mining wall cutting-in point position of the mining machine E2 and the B end. At this time, the mining wall cutting condition is shown in Figure 7 .

[0065] S12. The mining machine E1 reaches the mining wall cutting-in point position of the mining machine E1 and stops after walking towards the A end by a stop distance plus an oblique cutting distance, at this time the mining machine E1 obliquely cuts into the mining wall; the mining machine E2 stops at a stop distance plus an oblique cutting distance in front of the mining wall cutting-in point position of the mining machine E2, the pushing device continues to push the conveyer, the terminal point of the pushing is an oblique cutting distance away from the mining machine E2; the mining machine E2 reaches the mining wall cutting-in point position and stops after walking towards the A end by a stop distance plus an oblique cutting distance, at this time the mining machine E2 obliquely cuts into the mining wall; the mining machine E3 stops at the B end, thus completing a cycle of one cut. Then return to step S4 to prepare for the next cut mining.

[0066] Steps S10-S12 are the rock cutting stage, after the three mining machines cut the top and bottom waste layers and stop at the initial positions of each, the pushing conveyer is prepared for the next cut mining. The three mining machines cut the top and bottom waste layers at the same time, the production efficiency is multiplied.

[0067] Further, in the steps S10, S11, the exposed roof formed after cutting the top waste layer is randomly supported by a support following each mining machine (see Figure 6 、 7 ).

[0068] The upper limit value of the length of the mining wall of the working face is preferably not less than 100 m, for example 100-1000 m, or even longer, which can greatly reduce the number of roadways between the mining walls compared to the original 100 m, thus greatly saving the engineering cost corresponding to the amount of roadway excavation.

Claims

1. A method for combined mining of mineral material by a plurality of machines, characterized in that: The middle and high grade ore layer is arranged in the middle or upper part of the height direction of the mining wall when the working face is laid out, the upper and lower parts of the middle and high grade ore layer of the mining wall are the top and bottom waste layers respectively, the top waste layer is a low grade ore layer, the bottom waste layer includes the low grade ore layer and the rock layer adjacent to the upper and lower parts, three mining machines are arranged at the same time on the same working face with a time interval, all the mining machines first mine the middle and high grade ore layer in parallel, and then cut off the top and bottom waste layers in parallel, the top waste layer forms a roof after cutting, and the bottom waste layer forms a floor after cutting, and the method comprises the following steps: S1. The two ends of the working face are marked as A end and B end respectively, the mining machines E1, E2 and E3 are sequentially and intervally stopped at the A end and the B end in the direction from the A end to the B end, the mining machine E1 is stopped between the A end and the middle point D of the working face, the mining machine E2 is stopped between the middle point D of the working face and the B end, and the mining machine E3 is stopped at the B end, and the stopping positions at this time are the initial positions of the mining machines; for a large inclination working face, the higher end is taken as the A end, and the lower end is taken as the B end; S2. The pushing device pushes the conveyor to the mining wall by a distance of one cutting depth, the pushing length is from the A end to a position which is one oblique cutting distance away from the mining machine E1; then the mining machine E1 walks to the A end by a stopping distance plus an oblique cutting distance and stops, at this time the mining machine E1 is obliquely cut into the mining wall, and this position is called the mining wall cutting-in point position of the mining machine E1; the mining machines E2 and E3 stop and wait; S3. The mining machines E1 and E3 stop and wait; the pushing device continues to push the conveyor, and the terminal point of the pushing is one oblique cutting distance away from the mining machine E2; the mining machine E2 walks to the A end by a stopping distance plus an oblique cutting distance and stops, at this time the mining machine E2 is obliquely cut into the mining wall, and this position is called the mining wall cutting-in point position of the mining machine E2; S4. The mining machines E1 and E2 stop and wait; the pushing device continues to push the conveyor, and the terminal point of the pushing is one oblique cutting distance away from the mining machine E3; the mining machine E3 walks to the A end by a stopping distance plus an oblique cutting distance and stops, at this time the mining machine E3 is obliquely cut into the mining wall; S5. The mining machines E1, E2 and E3 stop and wait; the pushing device continues to push the conveyor until the B end; S6. The mining machines E1 and E2 walk to the A end, the mining machine E3 first walks to the B end, and then walks to the A end after reaching the B end, and all the mining machines walk and mine the middle and high grade ore layer at the same time, wherein the mining machine E1 stops when walking to the A end; S7. The mining machine E1 stops after walking to the B end by a stopping distance, and the middle and high grade ore layer is cut and loaded clean during the walking process, the mining machines E2 and E3 continue to walk to the A end, and the middle and high grade ore layer is mined at the same time; S8. The mining machine E1 continues to stop and wait, the mining machine E2 stops when walking to the mining wall cutting-in point position of the mining machine E1, the mining machine E3 continues to walk to the A end, and the middle and high grade ore layer is mined at the same time; S9. The mining machines E1 and E2 continue to stop and wait, the mining machine E3 stops when walking to the mining wall cutting-in point position of the mining machine E2, and the middle and high grade ore layer is mined at the same time. S10. Adjust the height of the swing arms of the mining machines E1, E2 and E3 so that the two swing arms of each mining machine are aligned with the top and bottom waste layers respectively, the mining machine E1 walks to the A end and stops, the mining machines E2 and E3 walk to the B end, and the three mining machines cut off the top and bottom waste layers at the same time; S11. The mining machines E1, E2 and E3 walk to the B end at the same time and cut off the top and bottom waste layers; the mining machine E1 walks to a stop distance in front of the mining wall cut-in point position of the mining machine E1 plus a bevel cutting distance and stops; the pushing device pushes the conveyor to the mining wall by a cutting depth, and the pushing length is from the A end to a bevel cutting distance away from the mining machine E1; the mining machines E2 and E3 stop respectively when they walk to the mining wall cut-in point position of the mining machine E2 and the B end; S12. The mining machine E1 walks to the mining wall cut-in point position of the mining machine E1 and stops after walking a stop distance plus a bevel cutting distance to the A end, at which time the mining machine E1 bevels into the mining wall; the mining machine E2 stops at a stop distance plus a bevel cutting distance in front of the mining wall cut-in point position of the mining machine E2, the pushing device continues to push the conveyor, and the terminal pushing point is a bevel cutting distance away from the mining machine E2; the mining machine E2 walks to the mining wall cut-in point position of the mining machine E2 and stops after walking a stop distance plus a bevel cutting distance to the A end, at which time the mining machine E2 bevels into the mining wall; the mining machine E3 walks to the B end and stops; Return to step S4 to prepare for the next cut mining.

2. The method of claim 1, wherein: All mining machines are equipped with high-power swing arms and medium-diameter drums, and the diameter of the drum is adapted to the thickness of the medium-high grade ore layer.

3. The method of claim 2, wherein: The medium-high grade ore and waste cut off by cutting are transported by the same conveyor at different times, the waste is top waste and / or bottom waste, the top waste is low-grade ore, and the bottom waste is a mixture of low-grade ore and rock or low-grade ore.

4. The method of claim 3, wherein: All mining machines have the same specifications and configurations.

5. The method of claim 1, 2, 3 or 4, wherein: In steps S10 and S11, the exposed roof formed after cutting off the top waste layer is randomly supported by the support following each mining machine.

6. The method of claim 1, 2, 3 or 4, wherein: The upper limit of the length of the working face is not less than 100m.

7. The method of claim 5, wherein: the plurality of machines are associated with a single mining operation. The upper limit of the length of the working face is not less than 100m.

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