A semi-continuous raw coal transportation process in open-pit mines based on mine hoisting equipment

Abstract

A semi-continuous raw coal transportation process in open-pit mines based on a mine hoisting device involves several steps. First, the coal-loaded car travels uphill from the coal face along the mine road to the coal roof assembly point. Then, the car is lifted to a height by a mine hoisting device located between the coal roof assembly point and the crushing station platform, reaching the crushing station platform. Finally, the car travels along the mine road to the semi-fixed crushing station for coal unloading. The empty car then returns along the same route. The simultaneous lifting and lowering of the coal-loaded and empty cars via the mine hoisting device provides counterweight for each other. This design reduces the vehicle's travel distance, particularly minimizing the uphill climb for the coal-loaded car. By utilizing the mine hoisting device to address the most challenging driving conditions for the coal-loaded car, it not only improves operational efficiency and reduces fuel consumption but also minimizes the cross-traffic between the car and the dump truck, significantly reducing driving risks. Therefore, this design is not only highly efficient but also relatively safe.

Description

Technical Field

[0001] This invention relates to a transportation process, belonging to the field of coal mine transportation technology, and particularly to a semi-continuous raw coal transportation process in open-pit mines based on mine hoisting equipment. Background Technology

[0002] Currently, the raw coal mining and transportation processes in open-pit mines mainly include three types: continuous process, intermittent process, and semi-continuous process. Among them, the semi-continuous process combines the flexibility of the intermittent process with the high production efficiency of the continuous process, and is widely used in the Shenzhen-Dalian open-pit mine.

[0003] In the semi-continuous raw coal transportation process, the "single bucket – truck – semi-fixed crushing station – belt conveyor" semi-continuous process system features mature technology, a complete range of models, widespread practical application, reliable technology, and reasonable equipment matching at each stage, resulting in a high level of overall technological maturity. Therefore, the vast majority of open-pit mines in my country still employ this semi-continuous raw coal transportation process. The collected raw coal is transported by truck over long distances uphill to the semi-fixed crushing station, where it is crushed and then transported by belt conveyor to the coal storage yard or coal preparation plant. However, because this process still requires trucks to complete the transportation between the coal face and the semi-fixed crushing station, several problems remain. Problems include: limited climbing ability of coal transport trucks (slope not exceeding 8%), resulting in long uphill distances within the mine, low efficiency, and high transportation costs; high vehicle wear and tear, leading to high maintenance costs; high fuel consumption, high carbon emissions, and significant environmental pollution; difficulty in climbing slopes during extreme weather such as rain and snow, affecting energy supply; multiple intersections between coal transport trucks and other vehicles within the mine, posing significant safety hazards. At intersections, not only is slowing down required, impacting production efficiency, but the mine also needs to implement safety signage, retaining walls, and daily personnel training and management measures to ensure safe transportation at intersections; long uphill climbs within the mine also result in high labor intensity for drivers, significant dust pollution on coal transport roads, and a series of issues related to road watering and maintenance.

[0004] The information disclosed in this background section is intended only to enhance understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects and problems of low production efficiency and safety hazards in the existing technology, and to provide a semi-continuous raw coal transportation process for open-pit mines based on mine hoisting equipment with higher production efficiency and greater safety.

[0006] To achieve the above objectives, the technical solution of the present invention is: a semi-continuous raw coal transportation process in open-pit mines based on mine hoisting equipment, wherein the transportation process includes the following:

[0007] First, the coal trucks travel uphill from the coal face along the mine road to the coal roof assembly point. Then, the coal trucks are lifted to a height by the mine hoisting equipment located between the coal roof assembly point and the crushing station steps, and finally, the coal trucks travel along the mine road to the semi-fixed crushing station for coal unloading.

[0008] While the coal-carrying cars are in operation, empty cars are also in operation. First, the empty cars travel from the semi-fixed crushing station along the mine road to the crushing station steps. Then, the empty cars are lowered by the mine hoisting equipment to the coal roof collection point. Finally, they travel downhill along the mine road to the coal mining face for coal loading.

[0009] While the coal-carrying car is being lifted to a higher height by the mine truck lifting equipment, the empty car is simultaneously being lowered to a lower height by the same equipment. The coal-carrying car and the empty car run relative to each other and act as counterweights.

[0010] The transportation process also includes the overall propulsion process for the mining truck hoisting equipment, which includes the following:

[0011] First, the surface soil of the open-pit mine is stripped and loaded onto trucks, which are then transported to the dump site via a spoil road. Next, the exposed coal is harvested and transported to a semi-fixed crushing station using coal trucks. This cycle is repeated as the open-pit mine advances to one side. As the open-pit mine advances, the spoil boundary of the dump site gradually approaches the mine hoisting equipment. If the distance between the spoil boundary and the mine hoisting equipment reaches a preset value, the operation of the coal trucks, empty trucks, and spoil trucks is suspended. The mine hoisting equipment then moves a certain distance away from the spoil boundary, and the operation of the coal trucks, empty trucks, and spoil trucks resumes. Coal mining work begins below the mine hoisting equipment, completing the overall advancement of the mine hoisting equipment.

[0012] The transportation process also includes a transportation process between the semi-fixed crushing station and the coal preparation plant, which includes the following:

[0013] The coal-carrying car travels to the semi-fixed crushing station to unload the coal. The unloaded coal is then transported to the coal preparation plant via a belt conveyor. After the coal is unloaded, the coal-carrying car becomes an empty coal car, which returns along the original route, completing the raw coal transportation process.

[0014] The "certain distance" refers to the width of the coal seam floor in an open-pit mine, which is the overall single-pass advance distance of the open-pit mine.

[0015] In the transportation process, the number of coal-carrying cars and empty coal-carrying cars operating simultaneously is at least one, that is, at least one coal-carrying car and at least one empty coal-carrying car are operating simultaneously.

[0016] The mine hoisting equipment includes a double-track device, several lifting support devices, several lifting frames, and several winches; the double-track device is connected to lifting support devices at both ends and the lower middle part; the several lifting support devices are respectively set at the relatively higher crushing station step, the relatively lower coal roof gathering point, and the coal seam step between the crushing station step and the coal roof gathering point; after the double-track device is erected, its axis forms an angle A with the ground.

[0017] The dual-track device includes several parallel rails, with at least two slides formed between the parallel rails. At least one lifting frame is slidably connected within each slide. The lifting frames move relative to each other, and when the lifting frames reciprocate, the overall center of gravity is vertically downward.

[0018] The lifting and lowering of the mining truck hoisting equipment refers to:

[0019] The winches are installed on the top surface of one end of the double-track device; the coal-loaded car enters one of the lifting frames and is pulled by one of the winches to be lifted up along one of the slides until it reaches the crushing station step, thus completing the lifting up; at the same time, the empty coal car enters another lifting frame and is pulled by another winch to be lowered up along another slide until it reaches the coal roof collection point, thus completing the lowering up.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. In this invention, a semi-continuous raw coal transportation process in an open-pit mine based on a mine hoisting device, the coal-carrying car first travels uphill from the coal face along the mine road to the coal roof assembly point. Then, the coal-carrying car is lifted to a height by a mine hoisting device located between the coal roof assembly point and the crushing station platform, reaching the crushing station platform. Finally, the coal-carrying car travels along the mine road to the semi-fixed crushing station for coal unloading. This design reduces the vehicle's travel distance, especially the uphill process of the coal-carrying car, and replaces the most challenging driving conditions of the coal-carrying car with a mine hoisting device. This not only improves operational efficiency and reduces fuel consumption of the coal-carrying car, but also reduces the cross-traffic between the car and the dump truck, significantly reducing driving risks. Therefore, this design is not only highly efficient but also relatively safe.

[0022] 2. In the semi-continuous raw coal transportation process of an open-pit mine based on a mine hoisting device, the coal-loaded car is simultaneously lifted to a higher height by the mine hoisting device, while the empty car is simultaneously lowered to a lower height by the same device. The coal-loaded car and the empty car run relative to each other, acting as counterweights. In application, this design, with the coal-loaded car and the empty car running synchronously relative to each other and acting as counterweights, not only reduces energy consumption during the lifting and lowering process, saving energy, but also facilitates coordinated operation during transportation, improving transportation efficiency. Therefore, this invention can reduce costs and improve transportation efficiency.

[0023] 3. The present invention provides a semi-continuous raw coal transportation process for open-pit mines based on a mine hoisting device, which further includes an overall propulsion process for the mine hoisting device. This process includes: firstly, stripping the surface soil of the open-pit mine in the stripping zone, loading it onto trucks, and transporting it to the dumping ground via a dump road; then, collecting the exposed coal and transporting it to a semi-fixed crushing station via coal trucks, repeating this cycle as the open-pit mine advances to one side; then, as the open-pit mine advances as a whole, the dumping boundary of the dumping ground gradually approaches the mine hoisting device. If the distance between the dumping boundary and the mine hoisting device reaches a predetermined value... After setting the value, the operation of the coal-loaded cars, empty cars, and dump trucks is paused. Then, the mine hoisting equipment moves a certain distance away from the dump boundary. Subsequently, the operation of the coal-loaded cars, empty cars, and dump trucks is resumed, and the raw coal mining work below the mine hoisting equipment is carried out, completing the overall advancement of the mine hoisting equipment. In application, although it is necessary to wait for the equipment to move during the overall advancement of the open-pit mine, the movement time is short, and the impact on the overall open-pit mine advancement process is small. Moreover, this transportation process can shorten the transportation distance, improve operating efficiency, and reduce safety hazards. Therefore, this invention is not only highly efficient but also relatively safe. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the transportation process of the present invention.

[0025] Figure 2 This is a schematic diagram of the transportation process route in this invention.

[0026] Figure 3 This is one of the reference diagrams showing the state changes of the overall propulsion process of the mining truck hoisting equipment in this invention.

[0027] Figure 4 This is one of the reference diagrams showing the state changes of the overall propulsion process of the mining truck hoisting equipment in this invention.

[0028] Figure 5 This is one of the reference diagrams showing the state changes of the overall propulsion process of the mining truck hoisting equipment in this invention.

[0029] Figure 6This is one of the reference diagrams showing the state changes of the overall propulsion process of the mining truck hoisting equipment in this invention.

[0030] Figure 7 This is a schematic diagram of the mining truck hoisting device in this invention.

[0031] Figure 8 This is a schematic diagram of the dual-track device in this invention.

[0032] Figure 9 This is a schematic diagram of the pile fixing frame in this invention.

[0033] Figure 10 This is a schematic diagram of the lifting support device in this invention.

[0034] Figure 11 This is a schematic diagram of the lifting frame in this invention.

[0035] Figure 12 This is a side view of the lifting frame structure in this invention.

[0036] In the diagram: 1. Mine truck hoisting equipment; 2. Double-track device; 21. Rail body; 210. Slide rail; 3. Lifting support device; 31. Pile fixing frame; 311. Pile fixing hole; 32. Several lifting pile legs; 322. Sliding pile shoe; 33. Inclined support platform; 33. Support column; 331. Inclined platform; 332. Inclined surface; 333. Lifting frame; 4. Left fixed plate; 41. Right fixed plate; 42. Pulley assembly; 43. Fixed frame; 44. Fixed pin shaft; 45. Car carrier passage; 441. Movable blocking plate; 442. Telescopic rod; 443. Winch; 5. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] See Figure 1 — Figure 7 A semi-continuous raw coal transportation process in open-pit mines based on mine hoisting equipment, the transportation process comprising the following:

[0039] First, the coal truck travels uphill from the coal mining face along the mine road to the coal roof assembly point. Then, the coal truck is lifted to a height by the mine hoisting equipment 1, which is located between the coal roof assembly point and the crushing station steps, and finally, the coal truck travels along the mine road to the semi-fixed crushing station for coal unloading.

[0040] While the coal-carrying cars are in operation, there are also empty cars. First, the empty cars travel from the semi-fixed crushing station along the mine road to the crushing station steps. Then, the empty cars are lowered by the mine car hoisting equipment 1 to the coal roof collection point. Finally, they travel downhill along the mine road to the coal mining face for coal loading.

[0041] While the coal-carrying car is being lifted to a higher height by the mine truck lifting device 1, the empty car is simultaneously being lowered to a lower height by the mine truck lifting device 1. The coal-carrying car and the empty car run relative to each other and serve as counterweights.

[0042] The transportation process also includes the overall propulsion process of the mine truck hoisting equipment 1, which includes the following:

[0043] First, the surface soil of the open-pit mine is stripped and loaded onto trucks in the stripping zone, and then transported to the dump site via the dump road. Next, the exposed coal is harvested and transported to the semi-fixed crushing station by coal trucks. This cycle is repeated, and the open-pit mine advances to one side. As the open-pit mine advances, the dump boundary of the dump site gradually approaches the mine hoisting equipment 1. If the distance between the dump boundary and the mine hoisting equipment 1 reaches a preset value, the operation of the coal trucks, empty trucks, and dump trucks is suspended. Then, the mine hoisting equipment 1 moves a certain distance away from the dump boundary, and the operation of the coal trucks, empty trucks, and dump trucks is resumed. The raw coal mining work below the mine hoisting equipment 1 is then carried out, completing the overall advancement of the mine hoisting equipment 1.

[0044] The transportation process also includes a transportation process between the semi-fixed crushing station and the coal preparation plant, which includes the following:

[0045] The coal-carrying car travels to the semi-fixed crushing station to unload the coal. The unloaded coal is then transported to the coal preparation plant via a belt conveyor. After the coal is unloaded, the coal-carrying car becomes an empty coal car, which returns along the original route, completing the raw coal transportation process.

[0046] The "certain distance" refers to the width of the coal seam floor in an open-pit mine, which is the overall single-pass advance distance of the open-pit mine.

[0047] In the transportation process, the number of coal-carrying cars and empty coal-carrying cars operating simultaneously is at least one, that is, at least one coal-carrying car and at least one empty coal-carrying car are operating simultaneously.

[0048] The mining truck hoisting equipment 1 includes a double-track device 2, several lifting support devices 3, several lifting frames 4, and several winches 5; the double-track device 2 is connected to lifting support devices 3 at both ends and the lower middle part; the several lifting support devices 3 are respectively set at the relatively higher crushing station step, the relatively lower coal roof collection point, and the coal seam step between the crushing station step and the coal roof collection point; after the double-track device 2 is erected, its axis forms an angle A with the ground.

[0049] The dual-track device 2 includes several parallel rails 21, with at least two slides 210 formed between the parallel rails 21. At least one lifting frame 4 is slidably connected in each slide 210. The lifting frames 4 move relative to each other. When the lifting frames 4 reciprocate, the overall center of gravity is vertically downward.

[0050] The lifting and lowering of the mining truck hoisting equipment 1 refers to:

[0051] The aforementioned winches 5 are installed on the top surface of one end of the double-track device 2; the coal-loaded car enters one of the lifting frames 4, is pulled by one of the winches 5, and is lifted up along one of the slides 210 until it reaches the crushing station step, thus completing the lifting up; at the same time, the empty coal car enters another lifting frame 4, is pulled by another winch 5, and is lowered down along another slide 210 until it reaches the coal roof collection point, thus completing the lowering down.

[0052] The principle of this invention is explained as follows:

[0053] Vehicle scheduling in this semi-continuous raw coal transportation process is achieved through a scheduling system that can monitor data such as the production load, real-time capacity, and single-vehicle workload of mining trucks in real time, and provide timely feedback to adjust vehicle operation status, improve the refined management and intelligent level of raw coal transportation, and reduce the difficulty of vehicle scheduling management. Any system that can achieve the above functions can be adapted.

[0054] Example 1:

[0055] See Figures 1-2 A semi-continuous raw coal transportation process in open-pit mines based on a mine hoisting device is described. The transportation process includes the following steps: First, the coal-carrying car travels uphill from the coal mining face along the mine road to the coal roof assembly point. Then, the coal-carrying car is lifted to a height by the mine hoisting device 1, which is located between the coal roof assembly point and the crushing station steps, and then to the crushing station steps. Finally, the coal-carrying car travels along the mine road to the semi-fixed crushing station for coal unloading.

[0056] In application, the original coal truck route runs from the coal floor through the spoil heap and then to the semi-fixed crushing station. The coal truck routes are concentrated within the spoil heap. As the mine advances as a whole, the spoil heap moves to one side, and the coal transport route within the spoil heap gradually lengthens, severely encroaching on the spoil space and affecting the overall mine advancement efficiency. The coal transport route of this transportation process can be far away from the inner spoil heap, freeing up spoil space, which is conducive to improving the efficiency of balanced advancement in open-pit mines. Moreover, it reduces the intersection of spoil trucks and coal trucks, reducing safety hazards.

[0057] Example 2:

[0058] The basic content is the same as in Example 1, except that:

[0059] See Figures 3-6 The transportation process also includes the overall propulsion process of the mine hoisting equipment 1, which includes the following: First, the surface soil of the open-pit mine is stripped and loaded onto trucks in the stripping zone, and transported to the dump site via the dump road. Then, the exposed coal is collected and transported to the semi-fixed crushing station by coal trucks. This cycle is repeated, and the open-pit mine is advanced to one side as a whole. Then, as the open-pit mine advances as a whole, the dump boundary of the dump site gradually approaches the mine hoisting equipment 1. If the distance between the dump boundary and the mine hoisting equipment 1 reaches a preset value, the operation of the coal trucks, empty trucks, and dump trucks is suspended. Then, the mine hoisting equipment 1 moves a certain distance away from the dump boundary. Subsequently, the operation of the coal trucks, empty trucks, and dump trucks is resumed, and the raw coal mining work below the mine hoisting equipment 1 is carried out, completing the overall advancement of the mine hoisting equipment 1.

[0060] In application, Figures 3-6 This is a diagram illustrating the overall progress of the open-pit mine. Figure 3 Assuming the mine hoisting equipment 1 is in its final configuration, and the width of the coal seam floor is approximately 80 meters, to avoid disrupting the normal left-to-right advancement of the open-pit mine, the mine hoisting equipment 1 will move once every 80 meters the open-pit mine advances to the right. That is, after the open-pit mine advances 80 meters, it will reach... Figure 4 At this point, the coal seam slope reaches the side of the mine hoisting equipment 1. The mine hoisting equipment needs to be moved, and it will move 80 meters to reach... Figure 5 At this point, the raw coal pressed under the mine hoisting equipment 1 can be mined normally without affecting the normal coal mining process of the entire mine. However, when the mine hoisting equipment 1 moves, the steps at elevations 1025 and 1055 below it serve as the route for dump trucks. The dump trucks, loaded with stripped rock and soil, travel from these steps to the dump site. Therefore, to ensure safety, the dump trucks must pause and wait for the equipment to move while the mine hoisting equipment 1 is in motion. Since the equipment movement only takes a few hours, the impact on dumping is negligible compared to the entire open-pit mine's advancement process. Then, the open-pit mine continues its advancement, reaching... Figure 6 The process continues in the same state, repeating the previous steps to complete the open-pit mine's cyclical advancement.

[0061] Example 3:

[0062] The basic content is the same as in Example 2, except that:

[0063] While the coal-carrying car is being lifted to a higher height by the mine truck lifting equipment, the empty car is simultaneously being lowered to a lower height by the same equipment. The coal-carrying car and the empty car run relative to each other and act as counterweights.

[0064] In application, in order to maintain stability during the lifting and lowering process, the lifting and lowering are synchronized and relative to each other. The two act as counterweights to each other, which can reduce energy consumption and improve the coordination of vehicle operation.

[0065] Example 4:

[0066] The basic content is the same as in Example 3, except that:

[0067] First, the coal-loaded car travels uphill from the coal face along the mine road to the coal roof assembly point. Then, the coal-loaded car is lifted to a certain height by the mine hoisting device 1, which is located between the coal roof assembly point and the crushing station platform, and finally travels along the mine road to the semi-fixed crushing station for coal unloading. Simultaneously, an empty car is also in operation. The empty car first travels from the semi-fixed crushing station along the mine road to the crushing station platform, and then descends to a certain height by the mine hoisting device 1, reaching the coal roof assembly point. Finally, it travels downhill along the mine road to the coal face for coal loading.

[0068] In this application, taking an annual production capacity of 35 million tons as an example, the basic calculation data is as follows: A single mine car carries 210 tons of coal; the daily working time is 14.8 hours, and the annual working days are 330. The climbing speed of the coal-carrying car is 13.5 km / h; the speed of the coal-carrying car on flat roads is 25.5 km / h; the speed of the empty car on flat roads is 33 km / h; the speed of the empty car on downhill roads is 34.5 km / h; the average speed of the coal-carrying car from the coal face to the roof is 23.17 km / h; the average speed of the empty car from the roof to the coal face is 35.52 km / h; the average distance from the coal face to the roof is 2 km; the loading time is 5 minutes; and the unloading time in the semi-fixed crushing station is 2.5 minutes. After adopting the mine car hoisting equipment 1 of this transportation process, the running time of the mine car in the mine car hoisting equipment 1 on this hoisting section is approximately 3.56 minutes. The distance between the 1st and the semi-fixed crushing station on flat road is approximately 0.6 km, with a gradient of 0 degrees. The travel time under heavy load and no-load conditions can be calculated from this. In the original process, the distance between the coal roof and the fixed crushing station on flat road is 2.4 km, and the distance on the uphill section is 1.4 km. The travel time can be calculated from this. In summary, using the semi-continuous transportation process of this invention, the time for a coal truck to travel from the coal face to the semi-fixed crushing station, unload the coal, and return to the coal face is approximately 22.1 minutes, while the original transportation process takes 34.7 minutes. After comprehensive calculation, using this raw coal transportation process to complete the semi-continuous raw coal transportation work requires only 13 mining trucks to meet the annual output, while the original transportation process requires 20 mining trucks. Therefore, this semi-continuous transportation process can save 7 mining trucks. The saved number of mining trucks can further reduce fuel consumption, vehicle tire wear, maintenance costs, and labor costs, further improving economic efficiency.

[0069] Example 5:

[0070] The basic content is the same as in Example 4, except that:

[0071] See Figures 7-8The mine hoisting equipment 1 includes a double-track device 2, several lifting support devices 3, several lifting frames 4, and several winches 5. The double-track device 2 is connected to lifting support devices 3 at both ends and the lower middle part. The several lifting support devices 3 are respectively set at the relatively high crushing station step, the relatively low coal roof collection point, and the coal seam step between the crushing station step and the coal roof collection point. After the double-track device 2 is erected, its axis forms an angle A with the ground. The double-track device 2 includes several parallel rail bodies 21, and at least two slide rails 210 are formed between the several parallel rail bodies 21. At least one lifting frame 4 is slidably connected in each slide rail 210. The several lifting frames 4 move relative to each other. When the lifting frames 4 reciprocate, the overall center of gravity is vertically downward.

[0072] In application, two lifting frames 4 are slidably connected within a single slide rail 210, one of which runs along the upper track surface of the double track device 2 and the other runs along the lower track surface of the double track device 2. At least four lifting frames 4 can run simultaneously within the two slide rails 210.

[0073] Example 6:

[0074] The basic content is the same as in Example 5, except that:

[0075] See Figures 9-12 The lifting support device 3 includes a fixed pile frame 31, a plurality of lifting pile legs 32, and an inclined support platform 33. The fixed pile frame 31 is I-shaped, with fixed pile holes 311 at each of its four corners, and lifting pile legs 32 passing through each fixed pile hole 331. Sliding pile shoes 322 are provided at the bottom of each lifting pile leg 32. The inclined support platform 33 includes a support column 331 and an inclined platform 332. One end of the support column 331 is connected to the middle of the fixed pile frame 31, and the other end is hinged to the inclined platform 332. The bottom surface of the inclined support platform 33 protrudes downwards in the middle, forming a triangular inclined surface 333. The lifting frame 4 includes... The system includes a left fixed plate 41, a right fixed plate 42, a pulley assembly 43, and a fixed frame 44. Both ends of the bottom surface of the left fixed plate 41 and the right fixed plate 42 are hinged to the pulley assembly 43, which contacts the rail body 21. The top of the fixed frame 44 is hinged to the left fixed plate 41 and the right fixed plate 42 via a fixed pin 45. The fixed frame 44 is a hollow cage structure with openings at both ends forming a vehicle carrying channel 441. Movable blocking plates 442 are provided at both ends of the vehicle carrying channel 441. The sides of the movable blocking plates 442 are hinged to the fixed frame 44, and their top surfaces are connected to the fixed frame 44 via telescopic rods 443.

[0076] In application, the coal-loaded car enters the car-carrying channel 441 of one of the lifting frames 4, while the empty car enters the car-carrying channel 441 of the other lifting frame 4. The telescopic rod 443 retracts, pulling up one end of the movable blocking plate 442 to fix the coal-loaded car or the empty car in its respective car-carrying channel 441, preventing it from sliding back and forth. Then, one winch 5 pulls the coal-loaded car upward and the other pulls the empty car downward. The coal-loaded car and the empty car run relative to each other and act as counterweights.

[0077] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A semi-continuous raw coal transportation process in open-pit mines based on mine hoisting equipment, characterized in that, The transportation process includes the following: First, the coal truck runs uphill from the coal mining face along the mine road to the coal roof assembly point. Then, the coal truck is lifted to a height by the mine hoisting equipment (1) set between the coal roof assembly point and the crushing station steps, and is lifted to the crushing station steps. Finally, the coal truck runs along the mine road to the semi-fixed crushing station to unload the coal. While the coal-carrying car is running, an empty coal car is also running. First, the empty coal car runs from the semi-fixed crushing station along the mine road to the crushing station steps. Then, the empty coal car descends in height via the mine car hoisting equipment (1) to the coal roof collection point. Finally, it runs downhill along the mine road to the coal mining face for coal loading. While the coal-carrying car is being lifted to a higher height by the mine car lifting equipment (1), the empty coal car is simultaneously being lowered to a lower height by the mine car lifting equipment (1). The coal-carrying car and the empty coal car run relative to each other and serve as counterweights. The transportation process also includes the overall propulsion process of the mine truck hoisting equipment (1), which includes the following: First, the surface soil of the open-pit mine is stripped and loaded onto trucks in the stripping area, and transported to the dump site via the dump road. Then, the exposed coal is collected and transported to the semi-fixed crushing station by coal trucks. This cycle is repeated, and the open-pit mine is advanced to one side as a whole. Then, as the open-pit mine advances as a whole, the dump boundary of the dump site gradually approaches the mine hoisting equipment (1). If the distance between the dump boundary and the mine hoisting equipment (1) reaches the preset value, the operation of the coal trucks, empty coal trucks and dump trucks is suspended. Then, the mine hoisting equipment (1) moves a certain distance away from the dump boundary. Then, the operation of the coal trucks, empty coal trucks and dump trucks is resumed, and the raw coal mining work under the mine hoisting equipment (1) is carried out to complete the overall advancement of the mine hoisting equipment (1).

2. The semi-continuous raw coal transportation process in open-pit mines based on mine hoisting equipment according to claim 1, characterized in that: The transportation process also includes a transportation process between the semi-fixed crushing station and the coal preparation plant, which includes the following: The coal-carrying car travels to the semi-fixed crushing station to unload the coal. The unloaded coal is then transported to the coal preparation plant via a belt conveyor. After the coal is unloaded, the coal-carrying car becomes an empty coal car, which returns along the original route, completing the raw coal transportation process.

3. The semi-continuous raw coal transportation process in open-pit mines based on mine hoisting equipment according to claim 2, characterized in that: The "certain distance" refers to the width of the coal seam floor in an open-pit mine, which is the overall single-pass advance distance of the open-pit mine.

4. A semi-continuous raw coal transportation process in open-pit mines based on a mine hoisting device, as described in any one of claims 1-3, characterized in that: In the transportation process, the number of coal-carrying cars and empty coal-carrying cars operating simultaneously is at least one, that is, at least one coal-carrying car and at least one empty coal-carrying car are operating simultaneously.

5. A semi-continuous raw coal transportation process in open-pit mines based on a mine hoisting device, as described in any one of claims 1-3, characterized in that: The mining truck hoisting equipment (1) includes a double-track device (2), several lifting support devices (3), several lifting frames (4) and several winches (5); the double-track device (2) is connected to lifting support devices (3) at both ends and the lower middle part; the several lifting support devices (3) are respectively set at the relatively high crushing station step, the relatively low coal roof collection point, and the coal seam step between the crushing station step and the coal roof collection point; after the double-track device (2) is erected, its axis forms an angle A with the ground.

6. The semi-continuous raw coal transportation process in open-pit mines based on mine hoisting equipment according to claim 5, characterized in that: The dual-track device (2) includes several parallel tracks (21), and at least two slides (210) are formed between the parallel tracks (21). At least one lifting frame (4) is slidably connected in a single slide (210). The lifting frames (4) move relative to each other. When the lifting frames (4) slide back and forth, the overall center of gravity is vertically downward.

7. The semi-continuous raw coal transportation process in open-pit mines based on mine hoisting equipment according to claim 6, characterized in that: The lifting and lowering of the mining truck hoisting equipment (1) refers to: The aforementioned winches (5) are set on the top surface of one end of the double-track device (2); the coal car enters one of the lifting frames (4), is pulled by one of the winches (5), and is lifted up along one of the slides (210) until it reaches the crushing station step, thus completing the height lifting; at the same time, the empty coal car enters another lifting frame (4), is pulled by another winch (5), and is lowered down along another slide (210) until it reaches the coal roof collection point, thus completing the height lowering.

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