A method for arranging a semi-continuous transportation system for open-pit coal mining and stripping

Abstract

The present invention discloses a method for arranging a semi-continuous transportation system for open-pit coal mining and stripping, comprising the following steps: S1: setting up a crushing station, and using a lifting belt conveyor to lift and transport coal materials to the end step; S2: the main belt conveyor adjusts the positions of the receiving end and the unloading end in time as the mining and stripping work line moves forward; S3: a sliding chute is installed on the frame of the diversion transfer belt conveyor, and the unloading vehicle can travel along the belt; S4: the coal storage bidirectional belt conveyor is respectively aligned with the coal unloading belt or the soil discharge belt conveyor; S5: the soil discharge belt conveyor system discharges the stripping material to the soil discharge step, and the coal transport belt conveyor is connected to the surface transportation system of the open-pit mine to transport the material to a designated location on the surface. The method of the present invention achieves efficient utilization of the system throughout the year; improves the total production capacity of the semi-continuous process system of the open-pit mine, expands the coal supply capacity in the peak season; has less impact on the original production system of the open-pit mine, and avoids dust pollution in the open-pit coal storage yard.

Description

Technical Field

[0001] The invention relates to an open-pit mining method, in particular to an arrangement method of a semi-continuous transportation system shared by open-pit coal mining and stripping, and belongs to the field of open-pit mining. Background Art

[0002] Semi-continuous processes are beneficial for reducing production costs and carbon emissions during the production process, and have great promotion value in open-pit mining. However, the process currently has the following problems or shortcomings. On the one hand, in recent years, the proportion of semi-continuous processes used in coal production in large open-pit coal mines in my country has gradually increased. However, with the increasing demand for emergency peak-shaving capacity of thermal power in my country, higher requirements have been placed on the stability and instantaneous overload capacity of semi-continuous process systems in open-pit mines. On the other hand, since most open-pit coal mines in my country are located in the north, the semi-continuous stripping process system has difficulty in winter production, generally requiring a shutdown of 3 to 5 months. This results in large unit capacity investment, high costs, and a long payback period for the system. Therefore, the promotion of semi-continuous stripping process is difficult, and there is an urgent need to design and improve new layout methods to increase the utilization rate of coal resources in mines. Summary of the Invention

[0003] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a method for arranging a semi-continuous transportation system shared by open-pit coal mining and stripping, so as to solve the problems of low mining efficiency caused by unreasonable layout of the semi-continuous mining process in existing coal mining.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A method for arranging a semi-continuous transportation system for open-pit coal mining and stripping, comprising the following steps:

[0006] S1: A crushing station is installed on the production working face of the open-pit mine. The crushing station is connected to the receiving side of the lifting belt conveyor. The unloading side of the lifting belt conveyor extends along the production working face and lifts and transports the coal material to the first or second end step of the surface around the open-pit mine. The lifting belt conveyor is also arranged to the adjacent coal seam step;

[0007] S2: The main belt conveyor is arranged on the surface around the open-pit mine, and one side of its receiving end is connected to the discharge end of the lifting belt conveyor. The discharge end of the main belt conveyor is located in the open-pit mine dump. The main belt conveyor moves forward with the mining and stripping work line, and the positions of the receiving end and the discharge end are adjusted in time;

[0008] S3: The diverter transfer belt conveyor is located on the steps of the dumping yard in the extended direction of the main belt conveyor, and is arranged perpendicular to the dumping work line. Its receiving end is connected to the discharge end of the main belt conveyor, and the discharge end of the diverter transfer belt conveyor is connected to the coal transport belt conveyor. A sliding chute is installed on the diverter transfer belt conveyor frame, and a discharge car is installed on the chute. The discharge car can move along the belt;

[0009] S4: The coal storage bidirectional belt conveyor is arranged on the side of the soil dumping yard near the end wall, with a length of 300~500 meters. One end is located under the unloading car of the diversion and transfer belt conveyor, and is equipped with a dual-purpose receiving and unloading device. The lower part of the other end is connected to a rotary unloading chute. The upper end of the rotary unloading chute is funnel-shaped and is installed on the surface of a rotatable disc. The large mouth of the funnel is aligned with the discharge port of the coal storage bidirectional belt conveyor to receive materials. The small mouth of the funnel can rotate with the rotatable disc and is aligned with the coal unloading belt or the soil dumping belt conveyor respectively, so as to transfer the raw coal to the coal unloading belt and transport it to the coal storage yard of the soil dumping flat plate, or transfer the stripping material to the soil dumping belt conveyor and finally discharge it. A loading funnel is installed near the unloading end of the coal storage bidirectional belt conveyor. By changing the transportation direction, the stockpiled raw coal is transported back to the diversion and transfer belt conveyor;

[0010] S5: The soil discharge belt conveyor discharges the stripping material to the soil discharge step. The coal transport belt conveyor is connected to the surface transportation system of the open-pit mine to transport the material to the designated location on the surface. In the summer, when the demand for coal is low, the system is mainly used for stripping. The crushed stripping material is transported to the open-pit mine soil discharge yard (7) through the lifting belt conveyor (3), the main belt conveyor (6), the diversion transfer belt conveyor (8), the coal storage two-way belt conveyor (11), and the soil discharge belt conveyor (15). The soil discharge belt conveyor (15) is used for coal mining when it is moved. In the winter, when the demand for coal is high, the system is mainly used for coal mining. The raw coal is transported out through the lifting belt conveyor (3), the main belt conveyor (6), the diversion transfer belt conveyor (8), and the coal transport belt conveyor (9). When the coal transport belt conveyor (9) fails, the raw coal is stored on the flat plate of the dumping yard through the coal storage bidirectional belt conveyor (11); when the crushing station (1), the lifting belt conveyor (3), and the main belt conveyor (6) fail or the crushing station (1) and the lifting belt conveyor (3) need to be relocated, the raw coal stored in the coal storage yard is collected to meet the market demand, and the daily coal mining operation time is the ratio of the daily coal demand to the system coal mining capacity.

[0011] Furthermore, the crushing station and the lifting belt conveyor are arranged in groups, with at least two groups arranged.

[0012] Furthermore, a vibration device is arranged inside the rotary discharge chute 12 .

[0013] Preferably, in step S5, the material is first discharged to the bottom of the belt, and then gradually covered from the lowest to the highest.

[0014] The beneficial effects of the method of the present invention are:

[0015] This system ensures efficient year-round utilization of the crushing station, hoisting belt conveyors, and mainline belt conveyor systems; increases the overall production capacity of the open-pit mine's semi-continuous process system, expands coal supply during peak season, and promotes a shift from rigid to flexible coal production capacity; utilizes a stepped space slightly below the surface in the internal dump to store coal, minimizing impact on the open-pit mine's existing production system, improving the mine's emergency supply capacity while preventing dust pollution from the open-pit coal storage area. All required equipment is readily available, enabling standardized configuration, reducing system costs and operational complexity. The semi-continuous mining and stripping system shares a common end wall, leaving one end wall free for trucks, eliminating the need for overlapping transportation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a system layout diagram of the mining area;

[0017] Figure 2 Provide a simplified diagram of the system layout;

[0018] Figure 3 This is the relationship diagram between the diversion transfer belt conveyor and the coal storage bidirectional belt conveyor;

[0019] Figure 4 This is the relationship diagram of the coal storage bidirectional belt conveyor and adjacent systems.

[0020] In the figure, 1-crushing station; 2-production working face; 3-lifting belt conveyor; 4-surrounding surface of open-pit mine; 5-end wall; 6-mainline belt conveyor; 7-open-pit mine spoil dump; 8-diversion transfer belt conveyor; 9-coal transport belt conveyor; 10-unloading car, 11-coal storage two-way belt conveyor; 12-rotating unloading chute; 13-rotatable disc, 14-coal unloading belt, 15-soil discharge belt conveyor, 16-coal storage yard. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below with reference to the accompanying drawings.

[0022] A method for arranging a semi-continuous transportation system for open-pit coal mining and stripping, comprising the following steps:

[0023] S1: A crushing station 1 is installed on the open-pit mine production working face 2. The crushing station 1 is connected to the receiving side of a lifting belt conveyor 3. The unloading side of the lifting belt conveyor 3 extends along the production working face and lifts and transports the coal ore to the first or second end wall 5 steps on the surface 4 surrounding the open-pit mine. The lifting belt conveyor 3 is also deployed to adjacent coal seam steps. To increase mining efficiency, the crushing station 1 and the lifting belt conveyor 3 are grouped together, with at least two groups deployed. This allows for alternating relocation to maintain open-pit mine production continuity. This grouping also prevents individual equipment failures from causing the entire system to shut down and delay mining.

[0024] S2: The main belt conveyor 6 is arranged on the surface 4 around the open-pit mine, and one side of its receiving end is connected to the discharge end of the lifting belt conveyor 3. The discharge end of the main belt conveyor 6 is located in the open-pit mine dump 7. The main belt conveyor 6 moves forward with the mining and stripping work line, and the position of the receiving end and the discharge end is adjusted in time. Figure 1 and 2 shown.

[0025] S3: The diverter transfer belt conveyor 8 is located on the steps of the dumping yard in the extended direction of the main belt conveyor 6 and is arranged perpendicular to the dumping working line. Its receiving end is connected to the discharge end of the main belt conveyor 6, and the discharge end of the diverter transfer belt conveyor 8 is connected to the coal conveying belt conveyor 9. A sliding chute is installed on the frame of the diverter transfer belt conveyor 8, and a discharge vehicle 10 is installed on the chute. The discharge vehicle 10 can travel along the belt;

[0026] S4: The coal storage bidirectional belt conveyor 11 is arranged on the side of the soil dump near the end wall 5, with a length of 300 to 500 meters. One end is located below the discharge car 10 of the diversion transfer belt conveyor 8, and is equipped with a dual-purpose receiving and unloading device. The other end is connected to the lower part of the rotary discharge chute 12. The upper end of the rotary discharge chute 12 is funnel-shaped and is integrally mounted on the surface of a rotatable disc 13. The large opening of the funnel is aligned with the discharge port of the coal storage bidirectional belt conveyor 11 to receive the material. The small opening of the funnel can rotate with the rotatable disc 13 and be aligned with the coal discharge belt 14 or the soil discharge belt conveyor 15 respectively, so as to transfer the raw coal to the coal discharge belt 14 and transport it to the coal storage yard 16 on the flat plate of the soil dump, or transfer the stripped material to the soil discharge belt conveyor 15 and finally discharge it. When transporting large pieces of coal, too much material will accumulate in the channel, causing it to be blocked due to insufficient transportation. In order to avoid this problem, a vibration device is arranged inside the rotary discharge chute 12. The coal storage bidirectional belt conveyor 11 is equipped with a charging hopper near one end of the unloading position. By changing the transportation direction, the stored raw coal is transported back to the diversion transfer belt conveyor 8. Figure 3 and 4 shown.

[0027] S5: The soil discharge belt conveyor 15 discharges the stripping material to the soil discharge step. The coal transport belt conveyor 9 is connected to the surface transportation system of the open pit mine to transport the material to the designated location on the surface. The soil discharge is first discharged to the bottom of the belt, gradually covering the surface from the lowest to the highest, and gradually discharging the soil from the lowest to the highest, so that the mining surface remains as flat as possible and prevents landslides.

[0028] The method of the present invention implements a semi-continuous conveyor system layout for mining and stripping in an open-pit mine, enabling the simultaneous mining of coal resources and the disposal of waste materials. At the open-pit mine's production working face 2, the mined raw coal is crushed at a crushing station 1 and then transported by an elevating belt conveyor 3 to a higher level end wall 5. From there, it is transported to a mainline belt conveyor 6, which moves forward along the mining and stripping line, and then to a subsequent diversion transfer belt conveyor 8. The coal is then transported to the surface of the open-pit mine by a subsequent coal transport belt conveyor 9 for centralized transport.

[0029] A sliding chute is installed on the diverting and transferring belt conveyor 8 to allow the unloading vehicle 10 to travel. This allows the unloading vehicle 10 to transfer materials from the diverting and transferring belt conveyor 8 to the two-way coal storage belt conveyor 11. Because both ends of the two-way coal storage belt conveyor 11 can receive and discharge materials, free back-and-forth transfer is possible. The materials transported by the two-way coal storage belt conveyor 11 pass through the rotating discharge chute 12 and selectively fall onto the coal unloading belt 14 or the soil discharge belt conveyor 15. When coal is needed, the coal unloading belt 14 is selected to transport it to the coal storage yard 16 on the soil discharge flat plate. When waste materials such as stripping materials need to be transported, the soil discharge belt conveyor 15 is selected to send the materials out for disposal.

[0030] The transportation system's operational procedures are tailored to the seasonal production characteristics of the open-pit mine. Summer is traditionally the off-season for coal demand, and the system primarily focuses on stripping. Crushed stripping material is transported to the dump via the lifting belt conveyor 3, the main line belt conveyor 6 system, the diverting transfer belt conveyor 8, the coal storage bidirectional belt conveyor 11, and the soil removal belt conveyor 15 system. The soil removal belt conveyor 15 is then used for coal mining when it is relocated. Winter, traditionally the peak season for coal demand, is primarily focused on coal mining. Crushed raw coal is transported out via the lifting belt conveyor 3, the main line belt conveyor 6 system, the diverting transfer belt conveyor 8, and the coal transport belt conveyor 9 system. If the coal transport belt conveyor 9 system malfunctions, the raw coal is deposited on the dump flatbed via the coal storage bidirectional belt conveyor 11. If the crushing station 1, lifting belt conveyor 3, or main line belt conveyor 6 system malfunctions, or if the crushing station 1 or lifting belt conveyor 3 needs to be relocated, raw coal stored in the coal storage yard 16 is collected to meet market demand. The system adopts a time-sharing mining and stripping operation mode, giving priority to ensuring the production needs of raw coal. The daily coal mining operation time during normal production period is:

[0031] T=Q / q

[0032] Where: T is the time the system serves coal mining operations, h; Q is the daily coal demand of the open pit mine, t; q is the system coal mining capacity, t / h.

[0033] The entire system has a reasonable layout and is easy to operate, which can realize seasonal production and is more reasonable and efficient.

Claims

1. A method for arranging a semi-continuous transport system for open-pit coal mining and stripping, characterized in that: The following steps are involved: S1: A crushing station (1) is set up on the production working face (2) of the open-pit mine, and the crushing station (1) is connected to the receiving side of the lifting belt conveyor (3). The unloading side of the lifting belt conveyor (3) extends along the production working face (2) and lifts and transports the coal material to the first or second end wall (5) step of the surface (4) around the open-pit mine, and the lifting belt conveyor (3) is also arranged to the adjacent coal seam step; S2: The main belt conveyor (6) is arranged on the surface (4) around the open-pit mine, and one side of its receiving end is connected to the discharge end of the lifting belt conveyor (3). The discharge end of the main belt conveyor (6) is located in the open-pit mine dump (7). The main belt conveyor (6) adjusts the positions of the receiving end and the discharge end in time as the mining and stripping working line moves forward; S3: The diverting transfer belt conveyor (8) is located on the step of the dumping field in the extension direction of the main belt conveyor (6), and is arranged perpendicular to the dumping working line. Its receiving end is connected to the discharge end of the main belt conveyor (6), and the discharge end of the diverting transfer belt conveyor (8) is connected to the coal conveying belt conveyor (9). A sliding chute is installed on the frame of the diverting transfer belt conveyor (8), and a discharge car (10) is installed on the chute. The discharge car (10) can travel along the belt; S4: The coal storage bidirectional belt conveyor (11) is arranged on the side of the dumping site near the end wall (5), with a length of 300~500 meters. One end is located below the unloading vehicle (10) of the diversion and transfer belt conveyor (8), and is equipped with a dual-purpose device for receiving and unloading materials. The lower part of the other end is connected to a rotating unloading trough (12). The upper end of the rotating unloading trough (12) is funnel-shaped and is installed on the surface of a rotatable disc (13). The large mouth of the funnel is aligned with the discharge port of the coal storage bidirectional belt conveyor (11), receiving materials. The funnel The small opening can rotate with the rotatable disc (13) and be aligned with the coal unloading belt (14) or the soil discharge belt conveyor (15) respectively, so as to realize the transfer of the transported raw coal to the coal unloading belt (14) and transport it to the coal storage yard (16) on the soil discharge flat plate, or transfer the transported stripping material to the soil discharge belt conveyor (15) and finally discharge it. A loading funnel is installed near the unloading end of the coal storage bidirectional belt conveyor (11), and the stored raw coal is transported back to the diversion transfer belt conveyor (8) by changing the transportation direction; S5: The soil discharge belt conveyor (15) discharges the stripping material to the soil discharge step. The coal transport belt conveyor (9) is connected to the surface transportation system of the open-pit mine to transport the material to the designated location on the surface. In the summer, when the demand for coal is low, the system is mainly used for stripping. The crushed stripping material is transported to the open-pit mine soil discharge yard (7) through the lifting belt conveyor (3), the main belt conveyor (6), the diversion transfer belt conveyor (8), the coal storage two-way belt conveyor (11), and the soil discharge belt conveyor (15). The soil discharge belt conveyor (15) is used for coal mining when it is moved. In the winter, when the demand for coal is high, the system is mainly used for coal mining. The crushed raw coal is transported out through the lifting belt conveyor (3), the main belt conveyor (6), the diversion transfer belt conveyor (8), and the coal transport belt conveyor (9). When the coal transport belt conveyor (9) fails, the raw coal is stored on the flat plate of the dumping yard through the coal storage bidirectional belt conveyor (11); when the crushing station (1), the lifting belt conveyor (3), and the main belt conveyor (6) fail or the crushing station (1) and the lifting belt conveyor (3) need to be relocated, the raw coal stored in the coal storage yard is collected to meet the market demand, and the daily coal mining operation time is the ratio of the daily coal demand to the system coal mining capacity.

2. The method for arranging a semi-continuous transportation system for open-pit coal mining and stripping according to claim 1, characterized in that: The crushing station (1) and the lifting belt conveyor (3) are configured in a group.

3. The method for arranging a semi-continuous transportation system for open-pit coal mining and stripping according to claim 1 or 2, characterized in that: A vibration device is arranged inside the rotary discharge chute (12).

4. The method for arranging a semi-continuous transportation system for open-pit coal mining and stripping according to claim 1 or 2, characterized in that: In step S5, the material is first discharged to the bottom of the belt, and then gradually covered from the lowest to the highest level.

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