A continuous mining system and method for cross-elevation open-pit mine working faces

Abstract

The application discloses a kind of cross-elevation open-pit mine working face continuous mining system and mining method, main working line belt conveyor, secondary working line belt conveyor are arranged respectively on main working line, secondary working line, main working line belt conveyor is connected with end slope belt conveyor by being close to open-pit mine end slope one end;In the open-pit mine working slope on the side of main working line close to drop zone slope, bench advance mining forms advance groove, in the open-pit mine inner dump on the side of secondary working line close to drop zone slope, lagging formation lagging groove is discarded;In the surface of drop zone slope, inclined lifting belt conveyor is set in pseudo-inclined mode, and two ends of inclined lifting belt conveyor are located in advance groove and lagging groove respectively and are connected with main vehicle-mounted belt conveyor and secondary vehicle-mounted belt conveyor;The application can ensure the continuity of mining and the efficiency of coal production under the premise of maintaining the original mining required equipment.

Description

Technical Field

[0001] This invention relates to a continuous mining system, specifically to a continuous mining system and method for cross-elevation open-pit mine working faces. Background Technology

[0002] Continuous mining, one of the three major open-pit mining technologies, boasts numerous advantages such as high system efficiency and low transportation costs. However, this technology requires a continuous, relatively long, level working face to ensure its efficiency. Currently, due to geological changes such as gullies and fault subsidence, some open-pit mine working lines exhibit significant elevation differences, preventing the proper placement of belt conveyors at the working face. This drastically shortens the exploitable working line length of the continuous mining system, hindering the efficient operation of the equipment. Therefore, it is urgent to address the issue of belt conveyor placement in open-pit mines spanning different elevations to improve the applicability of continuous mining systems. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a continuous mining system and method for cross-elevation open-pit mine working faces, which ensures the continuity of mining and guarantees coal mine production efficiency while maintaining the original mining equipment.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a continuous mining system and mining method for a cross-elevation open-pit mine working face, comprising an end-side belt conveyor, a main working line belt conveyor, a secondary working line belt conveyor, an inclined hoisting belt conveyor, a main vehicle-mounted belt conveyor, and a secondary vehicle-mounted belt conveyor, wherein the end-side belt conveyor is installed on the end side of the open-pit mine.

[0005] The main working line belt conveyor and the secondary working line belt conveyor are respectively arranged on the bottom plate of the lowest coal mining bench of the main working line and the secondary working line. The end of the main working line belt conveyor that is close to the end of the open mine is connected to the end belt conveyor.

[0006] On the open-pit mine working side near the fault zone slope of the main working line, the bench advance mining forms an advance trench, while the open-pit mine spoil disposal site near the fault zone slope of the secondary working line forms a lag trench.

[0007] An inclined lifting belt conveyor is set up on the surface of the slope of the fault zone in a pseudo-inclined manner, with the two ends of the inclined lifting belt conveyor located in the leading trough and the lagging trough, respectively.

[0008] The inclined lifting belt conveyor in the advance trough is connected to the main working line belt conveyor via the main vehicle-mounted belt conveyor, and the inclined lifting belt conveyor in the lag trough is connected to the secondary working line belt conveyor via the secondary vehicle-mounted belt conveyor.

[0009] Furthermore, the bottom of the advance trough is located at the same horizontal level as the main working line belt conveyor, and the width of the advance trough meets the minimum turning radius of the truck and the minimum width for the layout and operation of the belt conveyor.

[0010] Furthermore, the width of the hysteresis trough meets the minimum turning radius of the truck and the minimum width for the layout and operation of the belt conveyor.

[0011] Furthermore, the vehicle-mounted belt conveyor is a short-distance belt conveyor installed on a self-propelled truck.

[0012] Furthermore, the part where the inclined lifting belt conveyor overlaps with the main vehicle-mounted belt conveyor is the unloading head, and the part where the inclined lifting belt conveyor overlaps with the secondary vehicle-mounted belt conveyor is the receiving tail.

[0013] A method for continuous mining of a cross-elevation open-pit mine face includes the following steps:

[0014] When the main working line and the secondary working line are both single-step:

[0015] S11, coal from the main working line and coal from the secondary working line are mined simultaneously. Coal mined from the secondary working line is transported to the surface sequentially via the secondary working line belt conveyor, the secondary car-mounted belt conveyor, the inclined elevator belt conveyor, the main car-mounted belt conveyor, the main working line belt conveyor, and the end-side belt conveyor. Coal mined from the main working line is transported to the surface sequentially via the main working line belt conveyor and the end-side belt conveyor.

[0016] S12: After the secondary working line advances to the design requirements, coal mining stops, and the secondary working line belt conveyor is moved towards the coal mining direction to complete the arrangement of the secondary working line belt conveyor for the next stage. Simultaneously, the secondary vehicle-mounted belt conveyor and the inclined elevator belt conveyor are moved forward. While internally discharging the lag trough of the previous stage, a lag trough for the next stage is reserved. After the main working line advances to the design requirements, coal mining stops, and the main working line belt conveyor is moved towards the coal mining direction to complete the arrangement of the main working line belt conveyor for the next stage. Advance mining forms the advance trough for the next stage, and the main vehicle-mounted belt conveyor and the inclined elevator belt conveyor are moved forward simultaneously.

[0017] When the main working line and the secondary working line are combined steps:

[0018] S21: Coal from the main working line and the secondary working line is mined simultaneously. The secondary working line adopts a narrow platform mining procedure, first mining the upper layers of the secondary working line, and then removing the belt conveyor of the secondary working line after mining is completed, and then mining the lower layers of the secondary working line. The main working line adopts a wide platform mining procedure, first mining the lower layers of the main working line, and then removing the belt conveyor of the main working line after mining is completed, and then mining the upper layers of the main working line. The coal transportation path for the main working line and the secondary working line of the combined bench is the same as that for the main working line and the secondary working line of the single bench.

[0019] S22: After the secondary working line advances layer by layer and the secondary working line advances layer by layer to meet the design requirements, coal mining stops. The secondary working line belt conveyor is moved towards the coal mining direction to complete the arrangement of the secondary working line belt conveyor for the next stage. Simultaneously, the secondary vehicle-mounted belt conveyor and the inclined elevator belt conveyor are moved forward. The lag trough of the previous stage is internally discharged while reserving the lag trough for the next stage. After the main working line advances layer by layer and the main working line advances layer by layer to meet the design requirements, coal mining stops. The main working line belt conveyor is moved towards the coal mining direction to complete the arrangement of the main working line belt conveyor for the next stage. Advance mining forms the advance trough for the next stage. Simultaneously, the main vehicle-mounted belt conveyor and the inclined elevator belt conveyor are moved forward.

[0020] Furthermore, when high coal output is required, the relocation of the secondary working line belt conveyor, secondary vehicle-mounted belt conveyor, and inclined elevator belt conveyor is not synchronized with the relocation of the main working line belt conveyor and main vehicle-mounted belt conveyor.

[0021] Compared with existing technologies, this invention can effectively avoid the adverse effects of working line breakage on continuous mining processes, maintain the integrity of continuous mining processes, and at the same time, the vehicle-mounted belt conveyor increases system flexibility and is applicable to multiple breakages. This invention has strong applicability and is suitable for single or multi-layer coal seams. The overall solution of this invention maintains the equipment and operation mode of the original continuous mining process, is simple to operate, and easy to implement. It can reduce at least one end-side belt conveyor, reducing mining costs. The solution of this invention uses a combination of advance trough and lag trough, which reduces the transport angle of the inclined lifting belt conveyor, allowing the use of ordinary belt conveyors, and greatly increases the applicability to mining areas. It can be used in various complex situations such as obstructed mining progress and tight internal drainage, facilitating flexible production arrangements and maintaining coal mine production efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the continuous mining system setup of the present invention;

[0023] Figure 2 This is a schematic diagram of the mining state when the main and secondary working lines of the present invention are single-step.

[0024] Figure 3 This is a schematic diagram of the early mining stage when the main and secondary working lines of this invention are combined steps;

[0025] Figure 4 This is a schematic diagram of the later stage of mining when the main and secondary working lines of the present invention are combined steps;

[0026] In the diagram: 1-Ground surface; 2-Main working line; 3-Secondary working line; 4-Main working line belt conveyor; 5-Secondary working line belt conveyor; 6-End side; 7-End side belt conveyor; 8-Working side; 9-Fall slope; 10-Advanced trough; 11-Internal spoil heap; 12-Lagging trough; 13-Inclined lifting belt conveyor; 14-Main vehicle-mounted belt conveyor; 15-Secondary vehicle-mounted belt conveyor; 16-Coal mining direction; 17-Layering on the main working line; 18-Layering on the secondary working line; 19-Layering below the secondary working line; 20-Layering below the main working line. Detailed Implementation

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figure 1 and Figure 2 As shown, the present invention provides a technical solution, a continuous mining system for a cross-elevation open-pit mine working face, including an end-side belt conveyor 7, a main working line belt conveyor 4, a secondary working line belt conveyor 5, an inclined lifting belt conveyor 13, a main vehicle-mounted belt conveyor 14, and a secondary vehicle-mounted belt conveyor 15, wherein the end-side belt conveyor 7 is installed on the end side 6 of the open-pit mine.

[0030] The fault zone divides the coal seam mining line into multiple segments at different elevations. Two adjacent segments are considered a unit. Within a unit, the segment closer to the surface 1 is the main working line 2, and the segment farther away is the secondary working line 3. On the bottom of the lowest mining bench of the main working line 2 and secondary working line 3, the main working line belt conveyor 4 and secondary working line belt conveyor 5 are respectively arranged. The end of the main working line belt conveyor 4 closest to the open-pit mine end face 6 is connected to the end face belt conveyor 7. On the side of the main working line 2 closest to the fault zone slope 9... On the open-pit mine working side 8, the advanced mining of the bench forms an advanced trench 10. The bottom of the advanced trench 10 is located at the horizontal level of the main working line belt conveyor 4. The width of the advanced trench 10 meets the minimum turning radius of the truck and the minimum width for the layout and operation of the belt conveyor, and is generally not less than 30m. On the side of the secondary working line 3 near the slope 9 of the fault zone, the waste dump 11 in the open-pit mine forms a delayed waste dump 12. The width of the delayed waste dump 12 meets the minimum turning radius of the truck and the minimum width for the layout and operation of the belt conveyor, and is generally not less than 30m.

[0031] An inclined lifting belt conveyor 13 is installed on the surface of the slope 9 of the fault zone using a pseudo-inclined method. The installation angle of the inclined lifting belt conveyor 13 is the maximum angle that can be used to maintain the maximum conveying capacity, which is generally 12-14°. Usually, the slope angle of the working face 8 of the open mine is greater than the installation angle of the inclined lifting belt conveyor 13. Therefore, the two ends of the inclined lifting belt conveyor 13 are located in the advance trough 10 and the lag trough 12, respectively.

[0032] The inclined lifting belt conveyor 13 in the advance trough 10 is connected to the main working line belt conveyor 4 via the main vehicle-mounted belt conveyor 14, and the inclined lifting belt conveyor 13 in the lag trough 12 is connected to the secondary working line belt conveyor 5 via the secondary vehicle-mounted belt conveyor 15. The vehicle-mounted belt conveyor is a short-distance belt conveyor installed on a self-propelled truck. The length of the conveyor can be adjusted as needed. The part where the inclined lifting belt conveyor 13 overlaps with the main vehicle-mounted belt conveyor 14 is the unloading head, which changes the inclined lifting belt conveyor 13 from inclined to horizontal unloading. The part where the inclined lifting belt conveyor 13 overlaps with the secondary vehicle-mounted belt conveyor 15 is the receiving tail, which changes the material from horizontal transportation to inclined lifting transportation.

[0033] When mining coal in a continuous mining system for a cross-elevation open-pit mine, there are two scenarios: one is when the working line is a single bench, and the other is when the working line is a combination of benches.

[0034] like Figure 1 and Figure 2 As shown, when the main working line 2 and the secondary working line 3 are single-step:

[0035] S11, the coal from the main working line 2 and the secondary working line 3 are mined simultaneously. The coal mined from the secondary working line 3 is transported to the surface 1 sequentially via the secondary working line belt conveyor 5, the secondary vehicle-mounted belt conveyor 15, the inclined lifting belt conveyor 13, the main vehicle-mounted belt conveyor 14, the main working line belt conveyor 4, and the end-side belt conveyor 7. During the mining process of the secondary working line 3, all areas except the lag trough 12 are normally discharged internally, and only the space of the lag trough 12 is retained. The coal mined from the main working line 2 is transported to the surface 1 sequentially via the main working line belt conveyor 4 and the end-side belt conveyor 7.

[0036] S12, after the secondary working line 3 advances to the design requirements, coal mining stops, and the secondary working line belt conveyor 5 is moved towards the coal mining direction 16 to complete the arrangement of the secondary working line belt conveyor 5 in the next stage. At the same time, the secondary vehicle-mounted belt conveyor 15 and the inclined lifting belt conveyor 13 are moved forward. The space of the lagging trough 12 in the previous stage is drained inward while reserving the lagging trough 12 for the next stage. After the main working line 2 advances to the design requirements, coal mining stops, and the main working line belt conveyor 4 is moved towards the coal mining direction 16 to complete the arrangement of the main working line belt conveyor 4 in the next stage. Advance mining forms the advance trough 10 of the next stage. At the same time, the main vehicle-mounted belt conveyor 14 and the inclined lifting belt conveyor 13 are moved forward.

[0037] like Figure 3 and Figure 4 As shown, when the main working line 2 and the secondary working line 3 are combined steps:

[0038] S21, the coal in the main working line 2 and the secondary working line 3 are mined simultaneously. The secondary working line 3 adopts a narrow platform mining procedure, first mining the upper layer 18, and after mining is completed, the secondary working line belt conveyor 5 is moved, and then the lower layer 19 is mined. After the excavator is moved, the width of the working face is small, which increases the working slope angle and reduces the lag of the mining and drainage face. The main working line 2 adopts a wide platform mining procedure, first mining the lower layer 20, and after mining is completed, the main working line belt conveyor 4 is moved, and then the upper layer 17 is mined. After the excavator is moved, the width of the working face is large, ensuring that the open-pit mine has sufficient coal reserves. The coal transportation path for the main working line 2 and the secondary working line 3 of the combined bench is the same as the coal transportation path for the main working line 2 and the secondary working line 3 of the single bench.

[0039] After the secondary working line layer 18 and the secondary working line layer 19 have advanced to the design requirements, coal mining is stopped. The secondary working line belt conveyor 5 is moved towards the coal mining direction 16 to complete the arrangement of the secondary working line belt conveyor 5 in the next stage. At the same time, the secondary vehicle-mounted belt conveyor 15 and the inclined lifting belt conveyor 13 are moved forward. The space of the lagging trough 12 in the previous stage is internally discharged while reserving the lagging trough 12 for the next stage. After the main working line layer 20 and the main working line layer 17 have advanced to the design requirements, coal mining is stopped. The main working line belt conveyor 4 is moved towards the coal mining direction 16 to complete the arrangement of the main working line belt conveyor 4 in the next stage. Advance mining forms the advance trough 10 of the next stage. At the same time, the main vehicle-mounted belt conveyor 14 and the inclined lifting belt conveyor 13 are moved forward.

[0040] Ideally, main working line 2 and secondary working line 3 should advance simultaneously to meet design requirements. Conveyors on both lines could then be relocated simultaneously, reducing the frequency of on-site relocation work, minimizing safety hazards, and ensuring coal output. However, due to various factors, it's difficult for main working line 2 and secondary working line 3 to reach design requirements simultaneously. Therefore, the relocation of conveyors on main working line 2 and secondary working line 3 must be carried out sequentially. If the open-pit mine has a tight production schedule and high coal output requirements, the conveyor relocation can proceed after either main working line 2 or secondary working line 3 reaches its design requirements; simultaneous relocation of conveyors on both lines is unnecessary. Conversely, if the open-pit mine has a relaxed production schedule and lower coal output requirements, the relocation can proceed after either main working line 2 or secondary working line 3 reaches its design requirements, waiting for the latter to reach its design requirements before relocating both conveyors simultaneously to reduce the frequency of on-site relocation work and minimize safety hazards.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any minor modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of continuous mining across an elevation strip mine working face, characterised by, The method comprises the following steps: A main working line belt conveyor (4) and a secondary working line belt conveyor (5) are arranged on the floor of the lowermost coal mining step of the main working line (2) and the secondary working line (3) respectively, and the main working line belt conveyor (4) is connected with the end slope belt conveyor (7) at one end close to the open-pit mine end slope (6); An advanced slot (10) is formed by step advanced mining on the open-pit mine working slope (8) on the side of the main working line (2) close to the falling belt slope (9), and a lag slot (12) is formed by lag dumping on the open-pit mine inner dumping site (11) on the side of the secondary working line (3) close to the falling belt slope (9); An inclined lifting belt conveyor (13) is arranged on the slope surface of the falling belt slope (9) in a pseudo-inclined manner, and the two ends of the inclined lifting belt conveyor (13) are located in the advanced slot (10) and the lag slot (12) respectively; The inclined lifting belt conveyor (13) in the advanced slot (10) is connected with the main working line belt conveyor (4) through the main vehicle-mounted belt conveyor (14), and the inclined lifting belt conveyor (13) in the lag slot (12) is connected with the secondary working line belt conveyor (5) through the secondary vehicle-mounted belt conveyor (15); When the main working line (2) and the secondary working line (3) are single steps: S11, the coal in the main working line (2) and the coal in the secondary working line (3) are mined simultaneously, and the coal mined in the secondary working line (3) is transported to the ground (1) in sequence through the secondary working line belt conveyor (5), the secondary vehicle-mounted belt conveyor (15), the inclined lifting belt conveyor (13), the main vehicle-mounted belt conveyor (14), the main working line belt conveyor (4), and the end slope belt conveyor (7); the coal mined in the main working line (2) is transported to the ground (1) in sequence through the main working line belt conveyor (4) and the end slope belt conveyor (7); S12, after the secondary working line (3) advances to the design requirement, coal mining is stopped, the secondary working line belt conveyor (5) is moved to the coal mining direction (16), the arrangement of the secondary working line belt conveyor (5) in the next stage is completed, the secondary vehicle-mounted belt conveyor (15) and the inclined lifting belt conveyor (13) are moved forward synchronously, the lag slot (12) in the previous stage is internally dumped, and the lag slot (12) in the next stage is reserved; after the main working line (2) advances to the design requirement, coal mining is stopped, the main working line belt conveyor (4) is moved to the coal mining direction (16), the arrangement of the main working line belt conveyor (4) in the next stage is completed, the next stage advanced slot (10) is formed by advanced mining, and the main vehicle-mounted belt conveyor (14) and the inclined lifting belt conveyor (13) are moved forward synchronously; When the main working line (2) and the secondary working line (3) are combined steps: S21, the coal of the main working line (2) and the coal of the secondary working line (3) are mined simultaneously, the secondary working line (3) adopts a narrow platform mining procedure, the upper layer (18) of the secondary working line is mined first, after the mining is completed, the secondary working line belt conveyor (5) is moved, and then the lower layer (19) of the secondary working line is mined; the main working line (2) adopts a wide platform mining procedure, the lower layer (20) of the main working line is mined first, after the mining is completed, the main working line belt conveyor (4) is moved, and then the upper layer (17) of the main working line is mined; the mining coal transportation path of the combined bench main working line (2) and the secondary working line (3) is the same as that of the single bench main working line (2) and the secondary working line (3); S22, after the upper layer (18) and the lower layer (19) of the secondary working line are advanced to the design requirement, the coal mining is stopped, the secondary working line belt conveyor (5) is moved to the coal mining direction (16), the arrangement of the secondary working line belt conveyor (5) of the next stage is completed, the secondary truck-mounted belt conveyor (15) and the inclined lifting belt conveyor (13) are moved forward at the same time, the internal discharge of the lagging groove (12) of the previous stage is performed while the lagging groove (12) of the next stage is reserved; after the lower layer (20) and the upper layer (17) of the main working line are advanced to the design requirement, the coal mining is stopped, the main working line belt conveyor (4) is moved to the coal mining direction (16), the arrangement of the main working line belt conveyor (4) of the next stage is completed, the leading groove (10) of the next stage is formed by leading mining, and the main truck-mounted belt conveyor (14) and the inclined lifting belt conveyor (13) are moved forward at the same time.

2. A method of continuous mining across a highwall bench according to claim 1, characterised in that: The bottom of the leading groove (10) is located at the horizontal height of the main working line belt conveyor (4), and the width of the leading groove (10) meets the minimum turning radius of the truck and the minimum width of the belt conveyor arrangement and operation.

3. A method of continuous mining across a highwall bench according to claim 1, characterised in that: The width of the lagging groove (12) meets the minimum turning radius of the truck and the minimum width of the belt conveyor arrangement and operation.

4. A method of continuous mining across a highwall bench face according to claim 1, characterised in that: The truck-mounted belt conveyor is a short-distance belt conveyor installed on a self-propelled truck.

5. A method of continuous mining across a highwall bench face according to claim 1, characterised in that: The joint part of the inclined lifting belt conveyor (13) and the main truck-mounted belt conveyor (14) is a discharge head, and the joint part of the inclined lifting belt conveyor (13) and the secondary truck-mounted belt conveyor (15) is a receiving tail.

6. A method of continuous mining across a highwall bench face according to claim 1, characterised in that: When the coal output requirement is high, the movement and arrangement of the secondary working line belt conveyor (5), the secondary truck-mounted belt conveyor (15) and the inclined lifting belt conveyor (13) are not synchronized with the movement and arrangement of the main working line belt conveyor (4) and the main truck-mounted belt conveyor (14).

Images