Open-air coal mining device suitable for high-altitude area

Abstract

The invention relates to the technical field of coal mining equipment, and particularly discloses an open-air coal mining device suitable for high-altitude areas. The crushing mechanism comprises a roller arranged at the end part of the walking mechanism, crushing teeth arranged at the peripheral end of the roller and a first power piece for driving the roller to rotate; a collecting mechanism; the bucket is arranged at the end of the walking mechanism and located below the crushing mechanism, the driving plates are symmetrically and rotationally connected into the bucket, and the second power piece drives the driving plates to rotate. The conveying mechanism comprises a first conveying belt, a conveying roller and a second conveying belt which are sequentially arranged on the walking mechanism, and the feeding end of the first conveying belt communicates with the end of the bucket; the melting separation mechanism comprises hot air plates arranged on the walking mechanism and located above the conveying rollers, a collecting tank located below the conveying rollers and a ventilation assembly for supplying hot air to the hot air plates, and the problem that in traditional open-air coal mining in the high-altitude area, water and soil loss at the construction position is likely to be caused by unified removal of a frozen soil layer and a coal mine is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of coal mining equipment, and particularly discloses an open-pit coal mining device suitable for high-altitude areas. BACKGROUND

[0002] The open-pit coal mining in high-altitude areas faces unique natural environment challenges, and the characteristics and technical difficulties mainly lie in the following aspects: firstly, the extremely harsh natural environment causes serious challenges to the coal mining process, the average annual temperature in the high-altitude area is lower than 0 DEG C, and the frozen soil layer is deep, which leads to a significant increase in excavation cost; secondly, the ecology in the high-altitude area is extremely fragile, and the surface frozen soil layer is inevitably damaged in the coal mining process, which is easy to affect the soil structure and cause water and soil loss; thirdly, the excavated coal blocks contain a large amount of frozen soil, and the transportation cost is high, the subsequent sorting steps are numerous, and the processing time is long.

[0003] In summary, the main technical difficulty of the open-pit coal mining in the high-altitude area lies in the frozen soil environment in the high-altitude area, and currently, the following coal mining means are usually used for the open-pit coal mining in the high-altitude area: firstly, the frozen soil layer is first broken, and then the coal mine is excavated; although this method can reduce the impurity content of the excavated coal blocks, soften the soil, and reduce the excavation difficulty, the cost is high because the hot water needs to be sprayed back and forth for multiple times to melt the frozen soil layer, and the construction conditions of the coal mining site are poor due to the melting of the frozen soil, which is easy to cause the vehicle to sink in the mud, slip and other phenomena; and in the areas with low temperature, the melting effect of the frozen soil layer is not obvious, and even more soil surface may be frozen due to the spraying of hot water; secondly, the frozen soil layer and the coal mine are broken at the same time in the excavation process; although the construction conditions of the site are better, the broken coal blocks and the frozen soil layer are difficult to separate, and the sorting needs to be performed in the subsequent steps after the unified transportation, which not only easily causes the water and soil loss of the construction position, but also increases the cost of transportation and subsequent processing. SUMMARY

[0004] The purpose of the present application is to solve the problem that the unified breaking of the frozen soil layer and the coal mine in the traditional open-pit coal mining in the high-altitude area easily causes the water and soil loss of the construction position and increases the cost of transportation and subsequent processing.

[0005] In order to achieve the above purpose, the basic scheme of the present application provides an open-pit coal mining device suitable for high-altitude areas, which comprises: a walking mechanism; a crushing mechanism comprising a roller provided at the end of the walking mechanism, crushing teeth provided at the circumferential end of the roller, and a first power member for driving the roller to rotate; The collecting mechanism comprises a shovel arranged at the end of the walking mechanism and below the crushing mechanism, a dial symmetrically connected in the shovel and a second power member for driving the dial to rotate; The conveying mechanism comprises a first conveying belt, a conveying roller and a second conveying belt arranged on the walking mechanism in sequence, and the feeding end of the first conveying belt is communicated with the end of the shovel; The melting and separating mechanism comprises a hot air plate arranged on the walking mechanism and above the conveying roller, a collecting groove arranged below the conveying roller and a ventilation assembly for supplying hot air to the hot air plate The principle and effect of the basic scheme are as follows: Compared with the prior art, the frozen soil layer and the coal mine are uniformly broken, so as to avoid the problem that the construction condition of the coal mining site is deteriorated due to the melting of the frozen soil, the coal mine can be collected at a lower cost in a high-altitude area with low temperature, and the frozen soil after being crushed is melted by the melting and separating mechanism, so as to separate the frozen soil and the coal block from each other, thereby reducing the subsequent conveying cost and processing cost, and the timely collection and melting treatment of the frozen soil can reduce the water and soil loss of the coal mining site without changing the construction condition of the coal mining site, so as to avoid damaging the soil environment of the coal mining site, and effectively solve the problem that the uniform breaking of the frozen soil layer and the coal mine easily causes the water and soil loss of the construction position, and increases the cost of transportation and subsequent processing in the traditional open-pit coal mining in a high-altitude area.

[0006] Further, the feeding end of the conveying roller is lower than the discharging end of the first conveying belt; The discharging end of the conveying roller is higher than the feeding end of the second conveying belt.

[0007] The setting mode facilitates the transportation of the frozen soil and the coal block along the first conveying belt to the conveying roller, facilitates the transportation of the coal block separated from the frozen soil along the conveying roller to the second conveying belt, and facilitates the transportation to the next processing position.

[0008] Further, the ventilation assembly comprises a gas tank and a vortex tube communicated with the gas tank, the cold end of the vortex tube is communicated with a cooling pipeline, the hot end of the vortex tube is communicated with a hot air pipeline, the hot air plate is provided with a ventilation cavity communicated with the hot air pipeline, and the side of the hot air plate facing the conveying roller is provided with a plurality of air outlets. The setting mode effectively utilizes the characteristics that one end of the vortex tube supplies cold air and the other end supplies hot air, so that the cold air of the vortex tube is used for heat dissipation and cooling of the power part such as the walking mechanism and the crushing mechanism, and the hot air melts the frozen soil on the conveying roller through the hot air plate, so as to realize the separation of the frozen soil and the coal block; and the low-temperature environment in the high-altitude area facilitates the high-pressure gas in the gas tank to keep a lower temperature, so as to generate hot air and cold air through the vortex tube.

[0009] Further, the collecting groove comprises a bottom frame arranged on the walking mechanism and an inner frame arranged in the bottom frame, a discharge gap is formed between the inner wall of the bottom frame and the outer wall of the inner frame, and the outer wall of the bottom frame is provided with a discharge pipeline in communication with the discharge gap. In this way, the water flow generated during the thawing of the frozen earth can be effectively separated from the earth, so that the water flow overflows from the edge of the inner frame and enters the discharge gap, and the earth is deposited at the bottom of the inner frame and is collected.

[0010] Further, the inner bottom of the inner frame is further provided with an air guide pipeline in communication with the hot air pipeline, the side wall of the air guide pipeline is provided with a plurality of air guide holes, a partition plate is arranged in the discharge gap, the partition plate divides the discharge gap into a foam discharge cavity and a bottom mud discharge cavity from top to bottom, and the discharge pipeline comprises a foam discharge pipeline and a bottom mud discharge pipeline in communication with the foam discharge cavity and the bottom mud discharge cavity respectively. The hot air supplied to the inner frame through the air guide pipeline can not only prevent the ice debris from falling into the inner frame and causing the liquid surface in the inner frame to be too low to freeze, but also form air bubbles in the inner frame to adsorb the residual coal powder in the earth, so that the coal powder and the foam are mixed and then enter the foam discharge cavity, thereby effectively collecting and utilizing the coal powder in the earth.

[0011] Further, the thawing and sorting mechanism further comprises a solvent adding assembly for adding a collecting agent and a foaming agent to the air guide pipeline, which comprises a Venturi tube arranged between the hot air pipeline and the air guide pipeline, a solvent pipe in communication with the side wall of the diffusion end of the Venturi tube, and a solvent tank in communication with the solvent pipe. The high-speed hot air flowing out of the vortex tube enters the Venturi tube to form a negative pressure environment for the solvent pipe, thereby adsorbing the solvent in the solvent tank through the solvent pipe, so as to automatically supply the solvent, so that the coal powder is mixed with the foam and floats up, and the collection and utilization of the coal powder in the earth are further improved. Further, the outer wall of the bottom frame is further provided with an air cavity in communication between the hot air pipeline and the Venturi tube, a fan blade driven by the air flow is rotatably connected in the air cavity, and a paddle shaft driven to rotate by the fan blade is rotatably connected in the inner frame. The high-speed hot air flowing out of the vortex tube also drives the paddle shaft to rotate through the fan blade, thereby achieving the purpose of stirring the liquid in the inner frame, so that the ice debris falling into the inner frame is submerged below the liquid surface and contacts the hot air to melt, thereby avoiding the phenomenon of ice formation on the liquid surface of the inner frame.

[0012] Further, the paddle shaft is rotated from the middle of the inner frame to the edge of the inner frame, the two paddle shafts are coaxially connected with the gear located outside the outer frame body and engaged with each other, the liquid discharge gap is further provided with a liquid discharge bin, the middle of the inner frame is provided with a plurality of liquid discharge ports communicated with the liquid discharge bin, and the liquid discharge pipeline further comprises a liquid discharge pipeline communicated with the liquid discharge bin. Through the above arrangement, the paddle shaft can push the foam to the two sides of the inner frame during rotation, and the body shaking of the walking mechanism during the coal mining process can push the foam out from the two sides of the inner frame, and the excess liquid can be directly discharged from the liquid discharge port, the liquid discharge bin and the liquid discharge pipeline. Part of the liquid enters the foam discharge cavity along with the paddle shaft, pushes the foam to flow, and carries the foam out from the foam discharge pipe.

[0013] Based on the same inventive concept, the present application provides an open coal mining method suitable for high-altitude areas, which comprises using the open coal mining device described above to carry out open coal mining in high-altitude areas.

[0014] Further, the steps of using the open coal mining device described above to carry out open coal mining in high-altitude areas are as follows: Step S1, driving the walking mechanism so that the roller of the crushing mechanism approaches the coal seam; Step S2, driving the crushing mechanism so that the roller crushes the coal seam; Step S3, driving the walking mechanism so that the bucket collects the crushed coal and frozen soil and is pushed to the first conveying belt by the push plate; Step S4, the coal and frozen soil flow to the conveying roller through the first conveying belt, the hot air plate supplies hot air to the surface of the conveying roller, the frozen soil is melted, the frozen soil is separated from the coal, and the melted frozen soil falls into the collection groove for centralized collection; Step S5, the coal separated from the frozen soil is transported to the second conveying belt by the conveying roller and enters the subsequent processing process.

[0015] Compared with the prior art, the present method uniformly breaks the frozen soil layer and the coal mine to avoid the problem that the melting of the frozen soil leads to the deterioration of the construction conditions of the coal mining site, can collect coal in high-altitude areas with lower cost and lower temperature, and melts the crushed frozen soil by the melting and separating mechanism to separate the frozen soil and the coal from each other, thereby reducing the subsequent conveying and processing costs, and timely collection and melting of the frozen soil can reduce the water and soil loss of the coal mining site without changing the construction conditions of the coal mining site, thereby avoiding the damage to the soil environment of the coal mining site and effectively solving the problem that the uniform breaking of the frozen soil layer and the coal mine in the traditional open coal mining in high-altitude areas easily leads to the water and soil loss of the construction site and increases the cost of transportation and subsequent processing. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of an open-pit coal mining device suitable for high-altitude areas proposed in an embodiment of the present application is shown; Figure 2 A schematic diagram of a crushing mechanism in an open-pit coal mining device suitable for high-altitude areas, proposed in an embodiment of the present application, is shown; Figure 3 A schematic diagram of a melting and separation mechanism in an open-pit coal mining device suitable for high-altitude areas, proposed in an embodiment of the present application, is shown; Figure 4 A cross-sectional view of a collecting tank in an open-pit coal mining device suitable for high-altitude areas, proposed in an embodiment of the present application, is shown; Figure 5 A schematic diagram of a ventilation assembly in an open-pit coal mining device suitable for high-altitude areas proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0018] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0019] The figure marks in the drawings of the specification include: walking mechanism 1, crushing mechanism 2, end roller 201, middle roller 202, roller bracket 203, connecting plate 204, sleeve 205, crushing teeth 206, collecting mechanism 3, dial 4, first conveyor belt 5, second conveyor belt 6, bottom frame 7, conveying roller 8, roller frame 9, hot air plate 10, hot air duct 11, connecting pipe 12, gear box 13, air disc 14, air guide branch pipe 15, drainage pipe 16, foam discharge pipe 17, bottom mud discharge pipe 18, inner frame 19, partition 20, foam discharge chamber 21, bottom mud discharge chamber 22, blade shaft 23, drainage bin 24, air guide pipe 25, vortex tube 26, Venturi tube 27, solvent tank 28.

[0020] An open-pit coal mining device suitable for high altitude areas, for example Figure 1 As shown: it includes a traveling mechanism 1, a crushing mechanism 2 arranged on the traveling mechanism 1 to crush coal mines and frozen soil layers, a collecting mechanism 3 to collect the crushed coal blocks and frozen soil blocks, a conveying mechanism to transport the coal blocks and frozen soil blocks, and a melting and selection mechanism to screen the coal blocks and frozen soil blocks.

[0021] The walking mechanism 1 adopts a crawler vehicle which is more practical in high altitude areas, such as Figure 2 As shown, the crushing mechanism 2 includes a roller bracket 203 provided at the front end of the crawler vehicle, a roller rotatably connected to the roller bracket 203, and a first power member that drives the roller to rotate, wherein the roller includes an intermediate roller and an end roller 201, and the outer walls of the intermediate roller and the end roller 201 are staggered with a plurality of crushing teeth 206, and the intermediate roller and the end roller 201 are connected by an axis, and a sleeve 205 located between the ends of the intermediate roller and the end roller 201 is provided on the roller bracket 203 through a connecting plate 204, and the ends of the intermediate roller and the end roller 201 are rotatably connected along the end of the sleeve 205, and the shaft passes through the interior of the sleeve 205, and the first power member adopts two roller motors installed between the rollers, and the output shafts of the two roller motors extend into the sleeve 205 through the roller bracket 203 and the connecting plate 204 and are connected to the axis through a bevel gear pair, and the roller bracket 203 is connected to the crawler vehicle through a hydraulic arm.

[0022] like Figure 1 As shown, the collecting mechanism 3 includes a bucket provided at the front end of the crawler vehicle and below the crushing mechanism 2, a dial 4 symmetrically connected to the bucket, and a second power member driving the dial 4 to rotate. The bucket is tilted, and the bucket tilts upward from the front end to the rear end. The second power member adopts a dial servo installed on the back side of the bucket. The output shaft of the dial servo passes through the bucket and is respectively connected to the dial 4. The dial 4 is provided with a plurality of dial blocks.

[0023] like Figure 1 As shown, the conveying mechanism includes a first conveyor belt 5, conveyor rollers 8, and a second conveyor belt 6, which are sequentially mounted on the crawler vehicle frame. The feed end of the first conveyor belt 5 extends into the bucket and communicates with the gap between the two dials 4. The discharge end of the first conveyor belt 5 is higher than the feed end of the conveyor rollers 8, which in turn is higher than the feed end of the second conveyor belt 6. The second conveyor belt 6 is tilted upward to transport the coal to the next processing location, such as the bucket of a loading vehicle. The first conveyor belt 5, conveyor rollers 8, and second conveyor belt 6 are each driven by a conveying motor to rotate their pulleys and rollers in the same direction, and adjacent rollers are connected by a chain drive.

[0024] like Figure 3 As shown, the melting and selection mechanism includes a collection trough mounted on the crawler vehicle frame and located below the conveyor roller 8, a hot air plate 10 located above the conveyor roller 8, and a ventilation assembly that supplies hot air to the hot air plate 10. The collection trough is wider than the width of the conveyor roller 8, and the roller frame 9 of the conveyor roller 8 is equipped with baffles to prevent coal blocks and frozen soil from falling from both sides of the conveyor roller 8 into the collection trough. The hot air plate 10 is installed between the tops of the two baffles.

[0025] like Figure 4As shown, the collecting tank comprises a bottom frame 7 provided on the track vehicle frame through a plurality of dampers and an inner frame 19 provided in the bottom frame 7, a drainage gap is formed between the inner wall of the bottom frame 7 and the outer wall of the inner frame 19, and the outer wall of the bottom frame 7 is provided with a drainage pipeline in communication with the drainage gap, wherein a drainage bin 24 and a partition plate 20 are provided in the drainage gap, the drainage bin 24 surrounds the outer wall of the inner frame 19, and the middle part of the front and rear two sections of the inner frame 19 is provided with a plurality of drainage ports in communication with the drainage bin 24, and the partition plate 20 divides the drainage gap into a foam discharge cavity 21 and a bottom mud discharge cavity 22 from top to bottom, and the bottom of the inner frame 19 is provided with a through groove in communication with the bottom mud discharge cavity 22. The drainage pipe includes a drainage pipeline 16 in communication with the drainage bin 24, a foam discharge pipe 17 in communication with the foam discharge cavity 21, and a bottom mud discharge pipe 18 in communication with the bottom mud discharge cavity 22. The drainage pipeline 16, the foam discharge pipe 17 and the bottom mud discharge pipe 18 are all in communication with control valves, and during operation, the drainage pipeline 16 and the foam discharge pipe 17 are in a normally open state, and the bottom mud discharge pipe 18 is opened periodically and filters the soil through a filter.

[0026] Correspondingly, a plurality of air guide pipes 25 supplied with hot air by the ventilation assembly are provided in the inner frame 19, the side wall of the air guide pipe 25 is provided with a plurality of air guide holes, and the inner frame 19 is symmetrically and rotatably connected to two paddle shafts 23, the paddle shaft 23 is provided with a plurality of paddles, and the paddle shaft 23 is coaxially connected to gears located outside the outer frame body and meshing with each other, as Figure 3 As shown, the gears are installed for protection through a gear box 13, and a gas disc 14 is further installed outside the gear box 13, a gas cavity is formed in the gas disc 14, and a fan blade driven to rotate by air flow is arranged in the gas cavity, and the fan blade shaft of the fan blade is coaxially connected to one of the paddle shafts 23.

[0027] As Figure 5 As shown, the ventilation assembly comprises a gas tank and a vortex pipe 26 in communication with the gas tank, the cold end of the vortex pipe 26 is communicated with a cooling pipeline, the hot end of the vortex pipe 26 is communicated with a hot air pipeline 11, the cooling pipeline is used for heat dissipation and cooling of the power part such as the walking mechanism 1 and the crushing mechanism 2, and the end of the hot air pipeline 11 is in communication with the hot air plate 10, and the hot air plate 10 is provided with a plurality of air outlets on the side facing the conveying roller 8; a hot air branch pipe is further provided on the hot air pipeline 11, the hot air branch pipe is communicated with the gas disc 14 through a connecting pipe 12, and the hot air branch pipe is communicated with a solvent adding assembly after penetrating out of the gas disc 14, wherein the solvent adding assembly comprises a Venturi tube 27 communicated with the connecting pipe 12, a solvent pipe communicated with the side wall of the diffusion end of the Venturi tube 27, and a solvent tank 28 communicated with the solvent pipe, and the solvent pipe and the solvent tank 28 are two respectively for supplying collecting agent and foaming agent respectively, and the end of the Venturi tube 27 is communicated with the air guide pipes 25 in the inner frame 19 through a plurality of air guide branch pipes 15.

[0028] Based on the same inventive concept, the embodiment provides an open-pit coal mining method suitable for high-altitude areas, which comprises using the open-pit coal mining device described above to perform open-pit coal mining in a high-altitude area, and the steps are as follows: Step S1, driving the tracked vehicle, and adjusting the hydraulic arm to make the roller of the crushing mechanism 2 close to the coal seam; Step S2, starting the roller motor, and the roller motor drives the intermediate roller and the end roller 201 to rotate through the bevel gear pair, so that the crushing teeth 206 on the roller crush the coal seam and the frozen soil layer; Step S3, driving the tracked vehicle, and collecting the crushed coal and frozen soil in the bucket while crushing the coal mine, and the steering wheel drives the dial 4 to rotate, and the dial block on the dial 4 moves the crushed frozen soil and coal to the first conveyor belt 5; Step S4, the coal and frozen soil are flowed to the conveying roller 8 through the first conveyor belt 5, the vortex tube 26 supplies hot air to the hot air plate 10, the hot air is supplied to the surface of the conveying roller 8 through the air outlet hole of the hot air plate 10, the frozen soil is melted, the frozen soil is separated from the coal, and the melted frozen soil is collected in the collecting groove; In this process, the cold air of the vortex tube 26 is used to cool and cool the power parts such as the walking mechanism 1 and the crushing mechanism 2; and, the high-speed hot air flowing out of the vortex tube 26 forms a negative pressure environment for the solvent pipe when entering the Venturi tube 27, thereby absorbing the solvent in the solvent tank 28 through the solvent pipe, mixing the collecting agent and the foaming agent with the airflow, and then entering the inner frame 19 through the air guide pipe 25 to form bubbles, using the natural hydrophobicity of coal dust and the hydrophilic property of clay, so that the foam is mixed with the coal dust and floats to the surface of the liquid, and the high-speed hot air flowing out of the vortex tube 26 also drives the paddle to rotate the paddle shaft 23, the paddle shaft 23 rotates from the middle of the inner frame 19 to the edge of the inner frame 19 to stir the liquid in the inner frame 19, and the foam is stirred to the two sides of the inner frame 19, and the body shaking of the walking mechanism 1 during the coal mining process drives the foam to be stirred out of the two sides of the inner frame 19, and the excess liquid is directly discharged from the liquid discharge port, the liquid discharge bin 24 and the liquid discharge pipe 16, part of the liquid enters the foam discharge chamber 21 with the paddle shaft 23, and pushes the foam to flow and discharge the foam from the foam discharge pipe 17; the soil is deposited at the bottom of the inner frame 19 and is collected, and is periodically discharged through the bottom mud discharge pipe 18 for filtration.

[0029] Step S5, the coal separated from the frozen soil is transported to the second conveyor belt 6 by the conveying roller 8, and enters the subsequent processing process.

[0030] Compared with the prior art, the frozen soil layer and the coal mine are uniformly broken in the embodiment, so as to avoid the problem that the construction condition of the coal mining site is deteriorated due to the melting of the frozen soil, the coal mine can be collected at a lower cost in a high-altitude area with low temperature, the broken frozen soil is melted by the melting and separating mechanism, so as to separate the frozen soil and the coal block from each other, thereby reducing the subsequent conveying cost and processing cost, and the timely collection and melting of the frozen soil can reduce the water and soil loss of the coal mining site without changing the construction condition of the coal mining site, so as to avoid the damage to the soil environment of the coal mining site, and effectively solve the problems that the water and soil loss of the construction position is caused by the uniform breaking of the frozen soil layer and the coal mine in the traditional open-pit coal mining in a high-altitude area, and the cost of transportation and subsequent processing is increased, and the flotation is used to effectively realize the collection and utilization of the coal powder in the soil.

[0031] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any indirect modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. An open-pit coal mining device suitable for high-altitude areas, characterized in that: include: Traveling mechanism; The crushing mechanism includes a roller provided at the end of the traveling mechanism, crushing teeth provided at the peripheral end of the roller, and a first power member for driving the roller to rotate; collecting agencies; It includes a bucket provided at the end of the traveling mechanism and located below the crushing mechanism, a dial symmetrically connected to the bucket for rotation, and a second power member driving the dial for rotation; The conveying mechanism includes a first conveying belt, a conveying roller, and a second conveying belt which are sequentially arranged on the traveling mechanism, wherein the feeding end of the first conveying belt is connected to the end of the bucket; The melting and selecting mechanism comprises hot air plates arranged on the traveling mechanism and respectively located above the conveying rollers, a collecting trough located below the conveying rollers and a ventilation component for supplying hot air to the hot air plates.

2. The open-pit coal mining device suitable for high-altitude areas according to claim 1, characterized in that: The feed end of the conveying roller is lower than the discharge end of the first conveyor belt; The discharge end of the conveying roller is higher than the feed end of the second conveyor belt.

3. The open-pit coal mining device suitable for high-altitude areas according to claim 1, characterized in that: The ventilation assembly includes an air tank and a vortex tube connected to the air tank. The cold end of the vortex tube is connected to a cooling pipe, and the hot end of the vortex tube is connected to a hot air pipe. A ventilation cavity connected to the hot air pipe is provided in the hot air plate, and a plurality of air outlet holes are provided on the side of the hot air plate facing the conveying roller.

4. The open-pit coal mining device suitable for high-altitude areas according to claim 3, characterized in that: The collecting trough comprises a bottom frame arranged on the walking mechanism and an inner frame arranged in the bottom frame, a discharge gap is formed between the inner wall of the bottom frame and the outer wall of the inner frame, and a discharge pipe communicating with the discharge gap is provided on the outer wall of the bottom frame.

5. The open-pit coal mining device suitable for high-altitude areas according to claim 4, characterized in that: An air guide duct connected to the hot air duct is also provided at the bottom of the inner frame, and a number of air guide holes are provided on the side walls of the air guide duct. A partition is provided in the discharge gap, and the partition divides the discharge gap into a foam discharge cavity and a bottom mud discharge cavity above and below. The discharge duct includes a foam discharge pipe and a bottom mud discharge pipe respectively connected to the foam discharge cavity and the bottom mud discharge cavity.

6. The open-pit coal mining device suitable for high-altitude areas according to claim 5, characterized in that: The melting and selecting mechanism also includes a solvent adding component for adding a collector and a foaming agent to the air guide duct, including a venturi tube arranged between the hot air duct and the air guide duct, a solvent tube connected to the side wall of the diffusion end of the venturi tube, and a solvent box connected to the solvent tube.

7. The open-pit coal mining device suitable for high-altitude areas according to claim 6, characterized in that: The outer wall of the bottom frame is also provided with an air cavity connected between the hot air duct and the venturi tube. The cylinder is rotatably connected to a fan blade driven by the airflow, and the inner frame is rotatably connected to a blade shaft driven by the fan blade.

8. The open-pit coal mining device suitable for high-altitude areas according to claim 7, characterized in that: The blade shaft rotates from the middle of the inner frame toward the edge of the inner frame, and the two blade shafts are coaxially connected to gears located outside the outer frame and meshing with each other. A drainage bin is also provided in the drainage gap, and a plurality of drainage ports connected to the drainage bin are provided in the middle of the inner frame. The discharge pipe also includes a drainage pipe connected to the drainage bin.

9. A method for open-pit coal mining suitable for high-altitude areas, characterized in that: The method comprises using the open-pit coal mining device according to any one of claims 1 to 8 to carry out open-pit coal mining in high-altitude areas.

10. The open-pit coal mining method suitable for high-altitude areas according to claim 9, characterized in that: The steps of using the open-pit coal mining device according to any one of claims 1 to 8 to perform open-pit coal mining in high-altitude areas are as follows: Step S1, driving the traveling mechanism so that the roller of the crushing mechanism approaches the coal seam; Step S2, driving the crushing mechanism so that the rollers crush the coal seam; Step S3: driving the traveling mechanism so that the bucket collects the crushed coal blocks and frozen soil, and the bucket is moved to the first conveyor belt by the dial; Step S4: The coal blocks and frozen soil flow through the first conveyor belt to the conveyor roller. The hot air plate supplies hot air to the surface of the conveyor roller to melt the frozen soil, separating the frozen soil from the coal blocks. The melted frozen soil falls into the collection trough for centralized collection. In step S5, the coal blocks separated from the frozen soil are transported by conveying rollers to the second conveyor belt and enter the subsequent processing process.

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