Large-dip-angle pit outlet system for strip mine mining

Abstract

The invention belongs to the technical field of bulk material conveying, and particularly relates to a strip mine mining large-dip-angle pit outlet system which comprises a folding belt type conveying device and a wheel type belt type conveying device which are used for conveying materials with the conveying angle smaller than or larger than 30 degrees. The folding belt type conveying device comprises a first conveying belt, the first conveying belt is annularly arranged through multiple sets of carrier rollers, each set of carrier rollers comprises a bearing carrier roller on the inner side and an elastic pressing roller on the outer side, and the elastic pressing rollers are connected with the rack through springs. The wheel type belt conveying device comprises a second conveying belt, the second conveying belt is in a U shape, pulleys are connected to the two sides of the second conveying belt through end shafts, rail round pipes are arranged on the two sides of the rack, the pulleys are arranged on the rail round pipes, and a plurality of partition plates are arranged on the second conveying belt at intervals. Materials with the conveying angle smaller than 30 degrees are conveyed through the folding belt type conveying device, meanwhile, raised dust of bulk materials is reduced, materials with the conveying angle larger than 30 degrees are conveyed through the wheel type belt type conveying device, and large-dip-angle conveying is met.

Description

Technical Field

[0001] This invention belongs to the field of bulk material conveying technology, specifically a deep-angle pit exit system for open-pit mining. Background Technology

[0002] In the process of open-pit mining, bulk materials are transported from the mine pit to the surface, which is currently mostly done by truck. However, due to the limited climbing ability of trucks, the transportation distance is long, the freight cost is high, and the economic benefits are not good.

[0003] Therefore, using a conveyor for lifting not only avoids the problem of long transport distances but also ensures the continuity and efficiency of material transport. However, the following difficulties exist in using conveyors for material transport: First, it needs to meet the requirements for lifting and conveying at large angles. Second, it needs to minimize dust pollution. If a closed material conveying system such as a tubular belt conveyor is used, although the dust diffusion problem can be avoided, its conveying angle is generally no more than 18 degrees, which is difficult to meet the requirements for conveying at large angles. In this case, either the size of the mine pit can be increased and the inclination distance of the inner side of the mine pit can be leveled to reduce the lifting angle of the material conveying, or conveying equipment such as wheeled belt conveyors can be used. Although this meets the requirements for conveying at large angles, the dust pollution is more serious. Summary of the Invention

[0004] This invention addresses the problem that existing open-pit mining steep-angle material handling systems, when using conveyors, cannot coordinate steep-angle material handling with dust control, and that while existing enclosed material handling equipment can prevent dust pollution, the conveying angle is relatively small. The invention provides a steep-angle material handling system for open-pit mining that uses springs and elastic pressure rollers to ensure that the conveying angle of the first conveyor belt is increased to 30° or less, thus meeting most conveying requirements. For areas with conveying angles greater than 30°, a wheeled belt conveyor is used in conjunction, maximizing the ability to meet steep-angle material handling requirements while minimizing dust pollution.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: An open-pit mining steep-angle conveying system is provided for transporting materials from the bottom of the pit to the surface. It includes a folding belt conveyor and a wheeled belt conveyor. The folding belt conveyor is used for conveying materials with an angle of less than 30°, and the wheeled belt conveyor is used for conveying materials with an angle of greater than 30°, thus meeting different conveying requirements.

[0006] Both the folding belt conveyor and the wheeled belt conveyor are equipped with a moving mechanism below them, which is used to drive the corresponding folding belt conveyor or wheeled belt conveyor to move along the end-side extension direction of the open-pit mine, so as to facilitate the adjustment of the position of the conveyor during the lifting and conveying of open-pit mineral materials.

[0007] The folding belt conveyor includes a first belt conveyor mounted on a frame. The first belt conveyor is arranged in a Z-shape and has a first conveyor belt. Multiple sets of idlers are arranged in the middle section of the frame, making the first conveyor belt form a ring. Each set of idlers includes a bearing idler located inside the first conveyor belt and an elastic pressure roller located outside the first conveyor belt. The outer side of the elastic pressure roller is connected to the frame by a spring. The multiple sets of idlers ensure that the first conveyor belt in the lifting section wraps the bulk material, avoiding dust pollution during the lifting and conveying process. The spring and the elastic pressure roller work together to ensure the friction between the first conveyor belt and the material, effectively improving the conveying angle.

[0008] The wheeled belt conveyor includes a second conveyor mounted on a frame, a second conveyor belt mounted on the second conveyor belt, the second conveyor belt being U-shaped and having end shafts fixedly connected to both sides, with pulleys connected to the end shafts, and track tubes fixedly mounted on both sides of the frame, with the pulleys mounted on the corresponding track tubes, and multiple partitions spaced apart on the inner side of the second conveyor belt, the partitions ensuring that the conveying angle meets the material conveying requirements of greater than 30°.

[0009] Preferably, the moving mechanism includes a tracked vehicle, and the folding belt conveyor or wheeled belt conveyor is installed above the corresponding tracked vehicle, so that the movement of the tracked vehicle drives the movement of the corresponding conveyor.

[0010] Preferably, each set of idlers includes multiple carrying idlers, one of which is horizontally positioned and the remaining carrying idlers are symmetrically positioned about the horizontally positioned carrying idler. The two adjacent carrying idlers are positioned at an obtuse angle, and the multiple carrying idlers support the bottom and both sides of the first conveyor belt.

[0011] Preferably, each set of idlers has three load-bearing idlers, one of which is horizontally positioned and the other two are located at its two ends and are symmetrically positioned.

[0012] Preferably, each set of idlers includes multiple elastic pressure rollers, each of which is connected to a spring and the spring is mounted on the frame. The multiple elastic pressure rollers ensure that the two sides of the first conveyor belt are close to each other to wrap the conveyed material, while the springs work together to ensure the friction between the first conveyor belt and the material, preventing the material from slipping at a certain conveying angle.

[0013] Preferably, each set of idlers has two elastic pressure rollers, which are arranged opposite each other and at an obtuse angle.

[0014] Preferably, the second conveyor belt includes a horizontal belt and a vertical belt. Vertical belts are fixedly installed at both ends of the horizontal belt. The vertical belts are located outside the horizontal belt and are set at a right angle to the horizontal belt. The vertical belts ensure the limiting of the conveyed material and prevent the material from slipping off the sides of the second conveyor belt.

[0015] The beneficial effects of the present invention through the above technical solution are as follows: 1. In the existing open-pit mine material conveying system, although conveying by tubular belt conveyors and other conveying devices can avoid dust pollution, it cannot achieve large-angle conveying when facing sections with large conveying angles. If wheeled belt conveyors and other conveying devices are used, although large-angle conveying can be easily achieved, the problem of dust pollution cannot be avoided. The present invention achieves the effect of reducing dust pollution while conveying materials out of the pit by combining the two.

[0016] 2. Since the conveying angle of tubular belt conveyors and other conveying devices is generally below 18°, when used in conjunction with wheeled belt conveyors and other large-angle conveying equipment to achieve material discharge from pits, multiple sections can only be transported by wheeled belt conveyors and other conveying devices, resulting in serious dust pollution. Therefore, this invention, based on the existing tubular belt conveyor, uses springs to cause elastic pressure rollers to squeeze the first conveyor belt, thereby pressing the first conveyor belt and the material it wraps around. This increases the friction between the first conveyor belt and the material it wraps around, making it less prone to relative slippage. This achieves the effect of a folding belt conveyor that avoids dust pollution while achieving a maximum conveying angle of up to 30°. Thus, in open-pit mineral material discharge conveying systems, the use of wheeled belt conveyors can be reduced, maximizing the avoidance of dust pollution while ensuring smooth large-angle conveying.

[0017] 3. This invention, based on the existing wheeled belt conveyor, connects the pulley to the second conveyor belt via an end shaft, and fixes a corresponding partition on the inner side of the second conveyor belt. Compared with the separate setting of the pulley connecting shaft and the conveyor belt in the existing wheeled belt conveyor, this invention further reduces running resistance, reduces friction and wear, extends the service life of the conveyor belt, and reduces energy consumption. At the same time, the pulley and end shaft work together to prevent the second conveyor belt from sagging or deviating, and the pulley and track steel pipe work together to guide and limit the material conveying process of the second conveyor belt. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2This is a schematic diagram showing the positional relationship between the idler rollers and the first conveyor belt of the folding belt conveyor device of the present invention.

[0020] Figure 3 This is a structural diagram showing the positional relationship between the track tube, pulley, and second conveyor belt of the wheeled belt conveyor device of the present invention.

[0021] The numbers in the attached diagram are as follows: 1 is a folding belt conveyor, 11 is the first conveyor belt, 12 is a carrying idler, 13 is an elastic pressure roller, and 14 is a spring. 2 is a wheeled belt conveyor, 21 is a second conveyor belt, 22 is an end shaft, 23 is a pulley, 24 is a track tube, and 25 is a partition. 3 represents the mobile mechanism. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figures 1-3 As shown, this embodiment provides a steep-angle pit exit system for open-pit mining, used to transport materials from the bottom of the pit to the surface. It includes a folding belt conveyor 1 and a wheeled belt conveyor 2. Multiple folding belt conveyors 1 and wheeled belt conveyors 2 are sequentially arranged to transport materials within the open-pit mine. A moving mechanism 3 is provided below each of the folding belt conveyor 1 and wheeled belt conveyor 2 to drive the corresponding folding belt conveyor 1 or wheeled belt conveyor 2 along the end face extension direction of the open-pit mine. Specifically, the moving mechanism 3 includes a tracked vehicle. The folding belt conveyor 1 or wheeled belt conveyor 2 is mounted above the corresponding tracked vehicle, which is positioned on the end face of the open-pit mine. Each folding belt conveyor 1 or wheeled belt conveyor 2 is moved by two corresponding tracked vehicles.

[0023] In one possible implementation, the folding belt conveyor 1 is directly mounted on top of the tracked vehicle to achieve movement, and the loading end and unloading end of the wheeled belt conveyor 2 are respectively located on top of the corresponding tracked vehicles. The movement of the wheeled belt conveyor 2 is achieved by the synchronous movement of the two tracked vehicles.

[0024] The folding belt conveyor 1 includes a first belt conveyor mounted on a frame. The first belt conveyor is arranged in a Z-shape and has a first conveyor belt 11. The feeding end and discharge end of the first belt conveyor are horizontally aligned. Multiple sets of idlers are arranged in the middle section of the frame. Specifically, multiple sets of idlers are arranged on the frame corresponding to the inclined lifting section of the first belt conveyor. These multiple sets of idlers cause the first conveyor belt 11 to be arranged in a loop, i.e., the first conveyor belt 11 in the inclined section of the first belt conveyor is wound into a loop. Figure 2As shown, each set of idlers includes a carrying idler 12 located inside the first conveyor belt 11 and an elastic pressure roller 13 located outside the first conveyor belt 11. The outer side of the elastic pressure roller 13 is connected to the frame by a spring 14. Each set of idlers includes multiple carrying idlers 12, one of which is horizontally positioned, and the remaining carrying idlers 12 are symmetrically positioned about the horizontally positioned carrying idler 12. Adjacent carrying idlers 12 are set at an obtuse angle. Specifically, each set of idlers has three carrying idlers 12, one of which is horizontally positioned, and the other two are horizontally positioned. The support rollers 12 are located at both ends and symmetrically arranged. The horizontally arranged support rollers 12 support and lift the lower part of the first conveyor belt 11 to prevent it from sagging. The support rollers 12 on both sides limit the upward bending of the first conveyor belt 11 on both sides, and simultaneously limit the movement of the first conveyor belt 11. Each group of rollers includes multiple elastic pressure rollers 13. Each elastic pressure roller 13 is connected to a spring 14, and the spring 14 is mounted on the frame. Specifically, each group of rollers has two elastic pressure rollers 13, which are arranged opposite each other. The elastic pressure rollers 13 are set at an obtuse angle. By further bending the two sides of the first conveyor belt 11 to make them contact or overlap, and then limiting them with the elastic pressure rollers 13, the first conveyor belt 11 of the inclined section of the first belt conveyor wraps the conveyed material, thereby avoiding dust pollution. At the same time, it increases the friction between the material and the first conveyor belt 11. On this basis, the spring 14 presses the outside of the first conveyor belt 11, further increasing the friction between the first conveyor belt 11 and the material wrapped inside, ensuring that the first conveyor belt 11 presses the material wrapped inside, thereby avoiding relative slippage during the conveying process. The folding belt conveyor device 1 is used for conveying materials with a conveying angle of less than 30°. That is, under the pressing action of the spring 14, it can ensure that even at an inclination angle of 30°, it can meet the large inclination angle conveying of materials. Compared with the current situation of conventional conveying equipment such as existing tubular belt conveyors with a maximum conveying angle of 18°, it greatly improves the applicability of the device and reduces the use of conventional belt conveyors, wheeled belt conveyors and other conveying devices that cannot avoid dust pollution, thereby effectively reducing the dust pollution problem during large inclination angle conveying.

[0025] The wheeled belt conveyor 2 is used for conveying materials with an angle greater than 30°. The wheeled belt conveyor 2 includes a second conveyor mounted on a frame. A second conveyor belt 21 is mounted on the second conveyor belt. The second conveyor belt 21 is U-shaped and has end shafts 22 fixedly connected to both sides. Pulleys 23 are connected to the end shafts 22. Track tubes 24 are fixedly mounted on both sides of the frame, and the pulleys 23 are mounted on corresponding track tubes 24. Multiple partitions 25 are spaced apart on the inner side of the second conveyor belt 21. The second conveyor belt 21 includes a horizontal belt and a vertical belt. Vertical belts are fixedly mounted at both ends of the horizontal belt, with the vertical belts located outside the horizontal belt. Furthermore, it is set at a right angle to the horizontal belt, and the partition 25 limits the material along the conveying direction. The two vertical belts limit the material on both sides. Under the action of the horizontal belt, the two vertical belts and the partition 25, multiple conveying grids with open tops are formed. The material is located in the conveying grid, thus ensuring that the material will not fall back or slide even at a conveying angle greater than 30°. At the same time, compared with conventional wheeled belt conveyors, the end shaft 22 is fixedly connected to the vertical belt, which can further reduce the running resistance. Meanwhile, the pulley 23 and the track tube 24 are used to limit and guide the second conveyor belt 21, preventing the conveyor belt from running off-track.

[0026] Based on the above, this invention, during the steep-angle conveying process in open-pit mining, firstly employs a folded belt conveyor 1 in areas where the conveying angle is 30° or less. Then, multiple sets of idler rollers are used to limit the material being lifted, enclosing it within a first conveyor belt 11 wound in a ring, thus avoiding dust pollution. Simultaneously, springs 14 press against the elastic pressure rollers 13, increasing the friction between the material and the first conveyor belt 11, thereby significantly expanding the conveying angle to meet material conveying needs of 30° or less. In areas requiring higher conveying angles, a wheeled belt conveyor is used to achieve steep-angle conveying. Specifically, partitions 25 and vertical belts limit the material during conveying. Therefore, in the entire system, only a small portion of the area requires non-enclosed conveying (i.e., only a small portion of the work section requires wheeled belt conveyor 2 for steep-angle conveying), greatly mitigating dust pollution while ensuring steep-angle conveying.

[0027] By utilizing the tracked vehicle of the mobile mechanism 3, the folding belt conveyor 1 and the wheeled belt conveyor 2 in the conveying system can be moved, thereby greatly improving the flexibility of open-pit mining. The working position and layout can be flexibly adjusted according to the actual situation.

[0028] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included within the scope of the present invention.

Claims

1. A steeply inclined pit-lifting system for open-pit mining, used to transport materials from the bottom of the pit to the surface, characterized in that, It includes a folding belt conveyor (1) and a wheeled belt conveyor (2). The folding belt conveyor (1) is used for conveying materials with an angle less than 30°, and the wheeled belt conveyor (2) is used for conveying materials with an angle greater than 30°. Both the folding belt conveyor (1) and the wheeled belt conveyor (2) are equipped with a moving mechanism (3) to drive the corresponding folding belt conveyor (1) or wheeled belt conveyor (2) to move along the end-side extension direction of the open-pit mine. The folding belt conveyor (1) includes a first belt conveyor mounted on a frame. The first belt conveyor is arranged in a Z-shape and a first conveyor belt (11) is mounted on the first belt conveyor. Multiple sets of idlers are mounted in the middle section of the frame. The multiple sets of idlers make the first conveyor belt (11) arranged in a ring. Each set of idlers includes a carrying idler (12) located inside the first conveyor belt (11) and an elastic pressure roller (13) located outside the first conveyor belt (11). The outer side of the elastic pressure roller (13) is connected to the frame by a spring (14). The wheeled belt conveyor (2) includes a second conveyor mounted on a frame. The second conveyor is equipped with a second conveyor belt (21). The second conveyor belt (21) is U-shaped and has end shafts (22) fixedly connected to both sides. The end shafts (22) are connected to pulleys (23). Track tubes (24) are fixedly mounted on both sides of the frame. The pulleys (23) are mounted on the corresponding track tubes (24). Multiple partitions (25) are spaced apart on the inner side of the second conveyor belt (21).

2. The open-pit mining steep-angle extraction system according to claim 1, characterized in that, The moving mechanism (3) includes a tracked vehicle, and the folding belt conveyor (1) or wheeled belt conveyor (2) is installed above the corresponding tracked vehicle.

3. The open-pit mining steep-angle extraction system according to claim 1, characterized in that, Each set of idlers includes multiple carrying idlers (12), one of which is horizontally positioned and the other carrying idlers (12) are symmetrically positioned about the horizontally positioned carrying idler (12), with an obtuse angle between adjacent carrying idlers (12).

4. The open-pit mining steep-angle extraction system according to claim 3, characterized in that, Each set of idlers has three carrying idlers (12), one of which is horizontally positioned and the other two are located at its two ends and are symmetrically positioned.

5. The open-pit mining steep-angle extraction system according to claim 1, characterized in that, Each set of rollers includes multiple elastic pressure rollers (13), each of which is connected to a spring (14) and the spring (14) is mounted on the frame.

6. The open-pit mining steep-angle pit-removal system according to claim 5, characterized in that, Each set of rollers has two elastic pressure rollers (13), which are arranged opposite each other and at an obtuse angle.

7. The open-pit mining steep-angle extraction system according to claim 1, characterized in that, The second conveyor belt (21) includes a horizontal belt and a vertical belt. The two ends of the horizontal belt are respectively fixedly provided with vertical belts. The vertical belts are located outside the horizontal belt and are set at right angles to the horizontal belt.

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