Multi-machine combined and timely support ore separating method
The method of mining materials by combining multiple machines for timely support has solved the problems of high difficulty in cutting hard materials in underground bauxite and low output, achieving efficient and low-cost mining results and improving equipment utilization and production capacity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-09-26
- Publication Date
- 2026-03-27
AI Technical Summary
Cutting hard materials in underground bauxite mines is difficult, resulting in slow movement speed of mining machines, low output, high costs, and hard rock blocks that can easily jam the walking system and affect the traction system.
The method of timely support and material separation mining using multiple machines is adopted. Medium and high grade mineral material layers are laid on the upper part of the mine wall, and mining machines with high-power rocker arms and medium-diameter drums are equipped to mine the medium and high grade mineral material layers in parallel and support them immediately. Medium and high grade mineral materials and waste materials are transported in stages, and the mining machines are controlled to mine from low to high.
It improved mining efficiency and equipment utilization, reduced tunnel excavation, lowered engineering costs, and enhanced the reliability and productivity of mining machines.
Smart Images
Figure CN115492579B_ABST
Abstract
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, general or poor working face roof condition. BACKGROUND
[0002] There are a large number 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. Therefore, cutting is difficult, and the hard rock blocks formed by cutting can easily hinder or even jam the walking system of the mining machine, which has 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 and timely supported ore material separate mining method to improve the mining efficiency and reduce the mining cost.
[0004] The main technical scheme of the present application is as follows:
[0005] A multi-machine combined and timely supported ore material separate mining method, when laying out the working face, the medium-high grade ore material layer is left in the upper part of the height direction of the mine wall. The medium-high grade ore material layer of the mine wall is below the bottom waste material layer, which includes the low-grade ore material layer and the rock layer adjacent above and below. 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, then immediately support the exposed roof randomly by pulling the support to the mine wall side, and then cut off the bottom waste material layer in parallel. The upper part of the medium-high grade ore material layer is cut to form a roof, and the bottom waste material layer is cut to form a floor.
[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 medium-high grade ore material and waste material cut by cutting are transported by the same conveyor at different times. The waste material is the bottom waste material, which 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 parallel mining of the medium-high grade ore material layer from low to high, and the parallel cutting of the top and bottom waste material layer from high to low.
[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 to the mining wall by a distance of a cutting depth, forming an S-shaped bending, and the corresponding mining machine is obliquely cut into the mining wall through the S-shaped bending. In the cutting ore stage, the corresponding mining machine continues to walk along the mining wall while mining the medium-high grade ore layer. In the cutting rock stage, the corresponding mining machine walks reversely while cutting off the bottom waste layer. In the preparation stage, the pushing device pauses after approaching each mining machine, waits for the corresponding mining machine to obliquely cut into the mining wall and stop, and then resumes pushing. After all the mining machines are obliquely cut into the mining wall in turn, they enter the cutting ore stage simultaneously.
[0011] The multi-machine combined and timely supported 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 parked in turn at intervals 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 to the mining 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 to A end by a stop distance plus a cutting distance and stops, at which time the mining machine E1 is obliquely cut into the mining wall, which is called the mining 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 to A end by a stop distance plus a cutting distance and stops, at which time the mining machine E2 is obliquely cut into the mining wall, which is called the mining 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 to A end by a stop distance plus a cutting distance and stops, at which time the mining machine E3 is obliquely cut into the mining 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 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 simultaneously mine the middle-high grade ore layer, wherein the mining machine E1 stops when walking to the A end; after the upper part of the middle-high grade ore layer is mined, the exposed roof is formed, and the draw support randomly supports the roof;
[0018] S7. The mining machine E1 stops after walking to the B end by one stop distance, and the middle-high grade ore layer is cut and packed during the walking process, the mining machines E2 and E3 continue to walk to the A end, and the middle-high grade ore layer is simultaneously mined, and the draw support randomly supports the roof after the top of the middle-high grade ore layer is mined;
[0019] S8. The mining machine E1 returns to the A end and stops waiting, the mining machine E2 stops when walking to the mining wall cut-in point position of the mining machine E1, the mining machine E3 continues to walk to the A end, and the middle-high grade ore layer is simultaneously mined;
[0020] S9. The mining machines E1 and E2 continue to stop waiting, the mining machine E3 stops when walking to the mining wall cut-in point position of the mining machine E2, and the middle-high grade ore layer is simultaneously mined;
[0021] S10. The rocking arm heights of the mining machines E1, E2 and E3 are adjusted so that the two rocking arms of each mining machine are aligned with the bottom waste layer, the mining machines E1, E2 and E3 walk to the B end, and the three mining machines cut the bottom waste layer at the same time;
[0022] S11. The mining machines E1, E2 and E3 cut the bottom waste layer while walking to the B end; the mining machine E1 stops when walking to a position in front of the mining wall cut-in point position of the mining machine E1 by one stop distance plus one bevel cutting distance; the pushing device pushes the conveyor to the mining wall by one cutting depth, and the pushing length is from the A end to a position away from the mining machine E1 by one bevel cutting distance; the mining machines E2 and E3 stop when walking to the mining wall cut-in point position of the mining machine E2 and the B end, respectively;
[0023] S12. The mining machine E1 walks to the mining wall cut-in point position and stops at the position after walking to the A end by one stop distance plus one bevel cutting distance, and the mining machine E1 bevels into the mining wall at this time; the mining machine E2 stops when walking to a position in front of the mining wall cut-in point position of the mining machine E2 by one stop distance plus one bevel cutting distance; the pushing device continues to push the conveyor, and the terminal point of the pushing is away from the mining machine E2 by one bevel cutting distance; the mining machine E2 walks to the mining wall cut-in point position and stops at the position after walking to the A end by one stop distance plus one bevel cutting distance, and the mining machine E2 bevels into the mining wall at this time; the mining machine E3 stops when walking to the B end; return to step S4 to prepare for the next cut mining.
[0024] The upper limit value of the length of the working face is preferably not less than 100 m.
[0025] The beneficial effects of the present application are:
[0026] The three or more mining machines are used to jointly mine in the same working face, and the capacity of the single face is greatly improved under the condition that the support and the conveyor are unchanged, and the economic benefit is greatly improved.
[0027] Due to the increase in capacity, the utilization rate of the working face equipment is improved, and the working face can be greatly lengthened, for example, from the original 100m to 100m-1000m or even longer, which is equivalent to the length of more than one original working face, so that the number of roadways between working faces is significantly reduced, thereby greatly saving the engineering cost brought by the roadway excavation amount.
[0028] For the distribution characteristics of the medium-high grade ore layer with moderate thickness, i.e., the hardness of the ore is low and the hardness of the bottom rock layer is high, the present application uses large mining machines, medium-diameter drums for cutting and loading the ore and waste material suitable for the thickness of the medium-high grade ore layer, which not only fully utilizes the capacity characteristics of the equipment, but also helps to ensure the reliability of the equipment; at the same time, the grade of the mined ore is ensured, and the mining efficiency is greatly improved.
[0029] For a large-dip-angle working face, the cutting of the rock with high hardness is mainly arranged during the downward movement of the mining machine, which can fully utilize the gravity of the mining machine, reduce the traction force consumption, and significantly reduce the wear and tear of the traction system of the mining machine. BRIEF DESCRIPTION OF DRAWINGS
[0030] Figure 1 The present application is a schematic diagram of the ore mining process for the same working face provided with three mining machines of the same specification and configuration;
[0031] Figure 2 The present application is a lateral schematic diagram of the working face equipment for the parallel mining of the medium-high grade ore layer by the three mining machines;
[0032] Figure 3 The present application is a lateral schematic diagram of the working face equipment for the parallel cutting of the bottom waste layer by the three mining machines;
[0033] Figure 4 The present application is a schematic diagram of the ore wall cutting state (before cutting, the three mining machines are all in the initial position);
[0034] Figure 5 The present application is a schematic diagram of the ore wall cutting state (the three mining machines are parallel mining the medium-high grade ore layer from low to high and supporting);
[0035] Figure 6 The present application is a schematic diagram of the ore wall cutting state (the whole ore wall mining is completed, and the three mining machines return to the initial position). BRIEF DESCRIPTION OF DRAWINGS:
[0037] E1. Mining machine; E2. Mining machine; E3. Mining machine; S. Conveyor; K. Medium-high grade ore; F. Waste (referring to low-grade ore or mixture of low-grade ore and rock); Lt. Stopping distance; Lx. Inclined cutting distance; T. Pushing device; Z. Support; D. Midpoint of working face;
[0038] Pull to the position; Pull from the position; ||: Stop pulling; Pull (the arrow direction indicates the pulling direction). DETAILED DESCRIPTION
[0039] The application discloses a kind of timely support ore mining method of multi-machine combination, it is a mechanized mining method, it is applicable to medium-high grade ore layer thickness moderate, roof condition general or poor working face.For example Figures 1-3 As shown, the main working face equipment needed to use includes mining machine, conveyor S, support Z and pushing device T. First, when laying working face, medium-high grade ore layer should be left in the upper part of the height direction of mine wall, and the medium-high grade ore layer below the mine wall is the bottom waste layer, which includes low-grade ore layer and rock layer adjacent to the top and bottom. Medium-high grade ore K is usable ore, and low-grade ore and rock are both waste F. At least three mining machines are arranged at the same time interval on the same working face, and all the mining machines first mine the medium-high grade ore layer in parallel, then immediately support the exposed roof randomly by pulling the support to the mine wall side, and then cut off the bottom waste layer in parallel. The upper part of the medium-high grade ore layer is cut to form a roof, and the bottom waste layer is cut to form a floor.
[0040] The application proposes a high-efficiency mining method of one-face multi-machine (more than three) combined operation in combination with the characteristics that the pulling speed of the mining machine is much lower than the pulling speed of the support and the pushing speed of the conveyor. By increasing the number of mining machines and the small-cost investment of the corresponding matching parts, the production capacity is multiplied, and the economic benefit is significantly improved.
[0041] All the mining machines are matched with high-power rocker arms and medium (or medium-small) diameter drums. The diameter of the drum should be adapted to the thickness of the medium-high grade ore layer. The so-called adaptation means that the diameter of the drum is smaller than but close to the thickness of the medium-high grade ore layer. If the diameter is too small, the mining efficiency will be affected, and if the diameter is too large, low-grade ore will be mixed. In view of the distribution characteristics of the medium-high grade ore layer with moderate thickness, i.e. "low hardness of ore and high hardness of bottom rock layer", the application uses large mining machines, medium-diameter drums adapted to the thickness of the medium-high grade ore layer to cut and load ore and waste, which not only fully utilizes the capacity characteristics of the equipment, but also helps to ensure the reliability of the equipment; at the same time, it also ensures the grade of the mined ore, greatly improving the mining efficiency.
[0042] The medium-high grade ore and waste are transported by the same conveyor at different times and can reach different conveying terminals, i.e. the ore bins, so as to ensure the grade of the ore. The waste is the bottom waste, which is a mixture of low grade ore and rock or low grade ore. If the low grade ore layer under 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 only contains low grade ore.
[0043] The specifications and configurations of all the mining machines are preferably the same, so as to facilitate the control and management of the operation process.
[0044] The method can be used for large inclination working faces, in which case the mining machines preferably control the mining of the medium-high grade ore layer from low to high, and the cutting of the top and bottom waste layers from high to low.
[0045] Further, the mining operation of each mining machine includes three stages, i.e. preparation, ore cutting and rock cutting. In the preparation stage, the pushing device pushes the conveyor to the wall by a distance of one cutting depth, forming an S-shaped bend, and the corresponding mining machine cuts into the wall through the S-shaped bend. In the ore cutting stage, the corresponding mining machine continues to walk along the wall while mining the medium-high grade ore layer. In the rock cutting stage, the corresponding mining machine walks in reverse while cutting the bottom waste layer. In the preparation stage, the pushing device pauses after approaching each mining machine, waits for the corresponding mining machine to cut into the wall and stop, and then resumes pushing. After all the mining machines cut into the wall in sequence, they enter the ore cutting stage simultaneously.
[0046] The following will take the embodiment shown in Figure 1 as an example to illustrate the implementation process of the method, which can include the following steps:
[0047] 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 right end of the illustrated working face, respectively). The mining machines E1, E2 and E3 are parked in sequence at intervals in the direction from A end to B end, ready to start a new cut. The specific positions are: 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 positions are the initial positions of the mining machines. At this time, the distribution of the medium-high grade ore layer and the waste layer on the wall is as shown in Figure 4 . The mining machine occupies a distance Lt in the stopped state, which is called the parking distance.
[0048] For large inclination working faces, the higher end is preferably taken as A end and the lower end is taken as B end.
[0049] S2. The pushing device pushes the conveyor towards the wall of the mine by a distance of one slice depth, and the pushing length is from the A end to a distance away from the mining machine E1 by a distance of one oblique cutting distance (which refers to the distance of the mining machine walking along the wall when it is obliquely cutting into the wall, denoted as Lx). After the pushing, the conveyor forms an S-shaped curve, which is a preparation for the mining machine E1 to obliquely cut into the wall on the track. Then the mining machine E1 walks towards the A end by a distance of one stop distance plus one oblique cutting distance, and then stops, at which time the mining machine E1 obliquely cuts into the wall, and this position is referred to as the wall cutting-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 wall of the mine, part of the floating material is squeezed towards the wall of the mine, the floating material that is too high slides into the conveying groove, and the remaining floating material is stacked above the front and rear of the shovel plate, providing a bottom cushion and sliding guide for the subsequent high-grade ore material into the conveying groove, and this process realizes the shovel loading of waste. For the first cut mining, the shovel-loaded waste is mainly the waste of the wall collapse, and for the subsequent cut mining, the shovel-loaded waste also includes the waste generated in the previous cut mining process.
[0050] 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 wall of the mine by a distance of one slice depth), and the end point of the pushing is away from the mining machine E2 by a distance of one oblique cutting distance, and the conveyor continues to shovel the waste during the pushing; the mining machine E2 walks towards the A end by a distance of one stop distance plus one oblique cutting distance, and then stops, at which time the mining machine E2 obliquely cuts into the wall, and this position is referred to as the wall cutting-in point position of the mining machine E2.
[0051] S4. The mining machines E1 and E2 stop and wait; the pushing device continues to push the conveyor, and the end point of the pushing is away from the mining machine E3 by a distance of one oblique cutting distance, and the conveyor continues to shovel the waste during the pushing; the mining machine E3 walks towards the A end by a distance of one stop distance plus one oblique cutting distance, and then stops, at which time the mining machine E3 obliquely cuts into the wall.
[0052] S5. The mining machines E1, E2 and E3 stop and wait; the pushing device continues to push the conveyor until the B end, i.e. the conveyor is pushed flat and the S-shaped curve is eliminated, and the conveyor finishes shoveling the waste.
[0053] Steps S1-S5 are the preparation stage, the pushing device pushes the conveyor towards the wall of the mine by a distance of one slice depth, and the mining machines obliquely cut into the wall in turn, preparing for the mining of the high-grade ore layer.
[0054] S6. The mining machines E1 and E2 walk towards the A end, the mining machine E3 first walks towards the B end, and then returns to walk towards the A end after reaching the B end, and all the mining machines walk simultaneously to mine the high-grade ore layer (see Figure 2). Wherein the mining machine E1 stops when it reaches the A end. After the upper part of the medium-high grade ore layer is mined, the exposed roof is formed, and the draw support supports the roof randomly (see Figure 5 ).
[0055] S7. The mining machine E1 stops after walking a stop distance to the B end, and the medium-high grade ore layer is cut and loaded during the walking process. The mining machines E2 and E3 continue to walk to the A end, and the medium-high grade ore layer is mined during the walking process. After the top of the medium-high grade ore layer is mined, the draw support supports the roof randomly.
[0056] S8. The mining machine E1 returns to the A end and stops waiting. The mining machine E2 stops when it reaches the mining wall cut-in point position of the mining machine E1. The mining machine E3 continues to walk to the A end and mines the medium-high grade ore layer during the walking process.
[0057] S9. The mining machines E1 and E2 continue to stop waiting. The mining machine E3 stops when it reaches the mining wall cut-in point position of the mining machine E2. The medium-high grade ore layer is mined during the walking process. By this step, the medium-high grade ore layer is basically mined. The mining wall state can be referred to Figure 5 .
[0058] Steps S6-S9 are the mining cutting stage. The three mining machines simultaneously mine the medium-high grade ore layer, and the production efficiency can be doubled. After the upper part of the medium-high grade ore layer is mined, the roof is supported in time to avoid affecting the safety of the working face.
[0059] S10. Adjust the rocker arm height of the mining machines E1, E2 and E3, so that the two rocker arms of each mining machine are aligned with the bottom waste layer (see Figure 3 ), and the mining machines E1, E2 and E3 walk to the B end (i.e. downward), and cut the bottom waste layer during the walking process. The mining wall state can be referred to Figure 6 .
[0060] S11. The mining machines E1, E2 and E3 cut the bottom waste layer while walking to the B end; the mining machine E1 stops at a stop distance plus an oblique cutting distance before the mining wall cut-in point position of the mining machine E1 (in front of the walking direction of the mining machine E1, the same below); the pusher moves the conveyor to the mining wall by a cutting depth distance, and the moving length is from the A end to a position away from the mining machine E1 by an oblique cutting distance; the mining machines E2 and E3 stop when they respectively reach the mining wall cut-in point position of the mining machine E2 and the B end. At this time, the mining wall cutting state can be referred to Figure 6 .
[0061] S12. The mining machine E1 reaches the mining wall cut-in point position of the mining machine E1 and stops after walking a stop distance plus a cutting distance to the A end, at which time the mining machine E1 cuts into the mining wall; the mining machine E2 stops at a position in front of the mining wall cut-in point position of the mining machine E2 by a stop distance plus a cutting distance, the pushing device continues to push the conveyor, and the pushing end is away from the mining machine E2 by a cutting distance; the mining machine E2 reaches the mining wall cut-in point position of the mining machine E2 and stops after walking a stop distance plus a cutting distance to the A end, at which time the mining machine E2 cuts into the mining wall; the mining machine E3 stops at the B end, and thus the cycle of one cut is completed. Then, the step S4 is returned to prepare for the next cut mining.
[0062] The steps S10-S12 are the cutting stage, and after the three mining machines cut away the bottom waste layer, they stop at the initial positions respectively and prepare for the next cut mining by pushing the conveyor. The three mining machines simultaneously cut the top and bottom waste layers, and the production efficiency is doubled.
[0063] The upper limit 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, thereby greatly saving the engineering cost corresponding to the amount of roadway excavation.
Claims
1. A method for combined multi-machine and timely support ore material separation, characterized in that: The middle and high grade ore layer is arranged at the upper part of the mining wall during the layout of the working face, and the lower part of the middle and high grade ore layer of the mining wall is the bottom waste layer, the bottom waste layer includes the upper and lower adjacent low grade ore layer and rock layer, three mining machines are arranged at the same time on the same working face, all the mining machines first mine the middle and high grade ore layer in parallel, then immediately support the exposed roof randomly by pulling the support to the mining wall side, and then cut off the bottom waste layer in parallel, the upper part of the middle and high grade ore 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 interval parked in the direction from the A end to the B end, 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 position is the initial position of each mining machine; for a large dip angle working face, the higher one end is taken as the A end, and the lower one 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 stop 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 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 stop 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 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 stop 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 returns to walk to the A end after reaching the B end, 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; after the upper part of the middle and high grade ore layer is mined, the exposed roof is formed, and the roof is randomly supported by pulling the support; S7. The mining machine E1 stops after walking to the B end by a stop distance, the middle and high grade ore layer is cut and loaded 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, and the roof is randomly supported by pulling the support after the top of the middle and high grade ore layer is mined; S8. The mining machine E1 returns to the A end and stops and waits, the mining machine E2 stops when walking to the mining wall cutting point position of the mining machine E1, and the mining machine E3 continues to walk to the A end, and mines the middle and high grade ore layer at the same time. S9. The mining machines E1 and E2 continue to stop and wait, the mining machine E3 stops when it reaches the position of the mining wall cut-in point of the mining machine E2, and mines the middle and high grade ore layer while walking; S10. The rocking arm heights of the mining machines E1, E2 and E3 are adjusted so that the two rocking arms of each mining machine are aligned with the bottom waste layer, and the mining machines E1, E2 and E3 walk towards the B end, and cut off the bottom waste layer while walking; S11. The mining machines E1, E2 and E3 cut off the bottom waste layer while walking towards the B end; the mining machine E1 stops when it reaches a stop distance and an oblique cutting distance in front of the mining wall cut-in point of the mining machine E1; the pushing device pushes the conveyor towards the mining wall by a distance of a cutting depth, and 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 when they respectively reach the mining wall cut-in point of the mining machine E2 and the B end; S12. The mining machine E1 reaches the mining wall cut-in point of the mining machine E1 and stops after walking a stop distance and an oblique cutting distance towards the A end, at which time the mining machine E1 obliquely cuts into the mining wall; the mining machine E2 stops when it reaches a stop distance and an oblique cutting distance in front of the mining wall cut-in point of the mining machine E2; the pushing device continues to push the conveyor, and the terminal pushing point is an oblique cutting distance away from the mining machine E2; the mining machine E2 reaches the mining wall cut-in point of the mining machine E2 and stops after walking a stop distance and an oblique cutting distance towards the A end, at which time the mining machine E2 obliquely cuts into the mining wall; the mining machine E3 stops when it reaches the B end; Return to step S4 to prepare for the next cut mining.
2. The method of claim 1, wherein the method is characterized by: All the mining machines are equipped with high-power rocking arms and medium-diameter drums, and the diameter of the drum is adapted to the thickness of the middle and high grade ore layer.
3. The method of claim 2, wherein the method further comprises: The middle and high grade ore and waste cut by the cutting are transported by the same conveyor at different times, and the waste is the bottom waste, which is a mixture of low grade ore and rock or low grade ore.
4. The method of claim 3, wherein the method further comprises: All the mining machines have the same specifications and configurations.
5. The method of claim 1, 2, 3 or 4, wherein: The upper limit of the length of the working face is not less than 100 m.
Citation Information
Patent Citations
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CN111594169A
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CN111622762A