Coal mining gangue specification sorting and conveying

Abstract

The application discloses a gangue specification sorting and conveying device for coal mining, which comprises an input conveying belt horizontally placed on the ground, a raw material conveying device externally connected to the right side of the input conveying belt, a density sorting device fixedly placed on the left side of the input conveying belt, n groups of density sorting devices horizontally arranged, a transfer conveying belt fixedly placed between every two groups of the density sorting devices, and a waste output belt fixedly placed on the left side of the leftmost density sorting device; and a gangue conveying belt fixedly placed in front of each group of the density sorting devices.

Description

Technical Field

[0001] This invention relates to the field of coal mining equipment, specifically to a coal mining gangue sorting and conveying system. Background Technology

[0002] Coal gangue is a solid waste generated during coal mining and washing. It is a dark gray rock with a low carbon content and harder than coal, which is associated with coal seams during coal formation. It includes gangue from tunnel excavation, gangue extracted from the roof, floor, and interlayers during mining, and gangue from coal washing. Its main components are Al2O3 and SiO2, and it also contains varying amounts of Fe2O3, CaO, MgO, Na2O, K2O, P2O5, SO3, and trace rare elements (gallium, vanadium, titanium, cobalt). While some gangue can be used as raw material for building materials, the large-scale stockpiling of coal gangue not only wastes land resources but also poses risks such as spontaneous combustion, rain damage, and mudification, causing serious environmental harm. However, from a resource perspective, coal gangue is a valuable secondary resource. Its resource utilization is a necessary measure to prevent environmental disasters and is also an important aspect of achieving ecological civilization and circular economy development in my country's coal industry.

[0003] Coal gangue has a carbon content ranging from 5% to 45%. The different carbon contents lead to different utilization methods. Classifying it according to carbon content can effectively promote recycling. However, existing equipment cannot effectively sort coal gangue with different carbon contents, and its low level of automation greatly reduces the efficiency of gangue sorting.

[0004] Therefore, it is necessary to provide a coal mine gangue sorting and conveying system to solve the above problems. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a coal mine gangue sorting and conveying system, comprising:

[0006] An input conveyor belt is placed horizontally on the ground. A raw material conveying device is connected to its right side, and a density sorting device is fixedly placed on its left side. There are n groups of density sorting devices arranged horizontally, and a transfer conveyor belt is fixedly placed between each pair of the n groups of density sorting devices. A waste output belt is fixedly placed to the left of the leftmost density sorting device.

[0007] The gangue conveyor belt is fixedly placed in front of each density sorting device.

[0008] Furthermore, as a preferred embodiment, each of the density separation devices contains flotation liquids of different densities, with the density of the flotation liquids decreasing sequentially from right to left, and the density of the flotation liquids being equal to the lowest density of the gangue grade screened in the corresponding density separation device.

[0009] Furthermore, as a preferred embodiment, the density sorting device includes:

[0010] The device support is placed horizontally on the ground, and a low-carbon gangue transfer component is fixedly mounted on it. A high-carbon gangue lifting component is coaxially fixedly mounted above the low-carbon gangue transfer component. A high-carbon gangue turning component is rotatably mounted above the high-carbon gangue lifting component. A hydraulic rod is rotatably mounted between the high-carbon gangue turning component and the high-carbon gangue lifting component.

[0011] Furthermore, preferably, the low-carbon gangue transfer assembly includes:

[0012] A fixed shell is fixedly mounted above the device bracket. A first partition plate and a second partition plate are coaxially fixedly mounted inside the shell. A drive motor is fixedly mounted above the first partition plate, and a first pusher blade is coaxially fixedly mounted on its output shaft.

[0013] The second spacer plate has a drive motor fixedly mounted on its upper surface, and a second pusher blade is fixedly mounted on its output shaft.

[0014] Furthermore, as a preferred embodiment, the first partition plate and the second partition plate are respectively configured as fan-shaped plates of 225° and 315°, the other 45° area of ​​the second partition plate is configured as a rockfall outlet, and a liquid discharge plate is provided at a counterclockwise interval of 45° from the rockfall outlet. The 45° area between the rockfall outlet and the liquid discharge plate is located directly below the fan-shaped plate area of ​​the first partition plate.

[0015] Furthermore, as a preferred embodiment, a material discharge cylinder is fixedly installed below the material discharge port, and an input end of a gangue conveyor belt or a waste output belt is provided below the material discharge cylinder. The area outside the material discharge cylinder below the second partition plate is set as a flotation liquid circulation chamber, and a circulation pump is fixedly installed on its bottom side wall. The other end of the circulation pump is located on the upper side of the high-carbon gangue lifting component.

[0016] Furthermore, as a preferred embodiment, the high-carbon gangue lifting assembly includes:

[0017] The lifting shell is coaxially fixedly mounted on the upper end of the low-carbon gangue transfer component. An internal gear ring is rotatably mounted on the inner wall of its bottom. A first motor is meshed on the outer side of the internal gear ring. The first motor is fixedly embedded on the lifting shell. Multiple sets of lifting transmission gears are irregularly meshed on the inner side of the internal gear ring. A lifting screw is coaxially fixedly mounted above each set of transmission gears.

[0018] Furthermore, as a preferred embodiment, the lifting screw is divided into three parts from bottom to top: a cylindrical section, a first threaded section, and a second threaded section. The combined length of the cylindrical section and the first threaded section of each lifting screw is equal to the length of the second threaded section. A one-way bearing is provided at the bottom of the first threaded section, and its outer side is covered with a thread that mates with it. A lifting nut is also threaded onto the first threaded section.

[0019] Furthermore, as a preferred embodiment, the rising nut is slidably fitted inside the side wall of the lifting housing, and a longitudinal or transverse mesh rod is fixedly fitted between every two sets of rising nuts of equal height.

[0020] Furthermore, preferably, the high-carbon gangue turning component includes:

[0021] The flip shell has multiple sets of second threaded sections of lifting screws fixedly mounted on it, and each set of second threaded sections has a transmission gear fixedly mounted on its upper end. The transmission gears are meshed with internal gear rings on their outer sides, and the internal gear rings are meshed with a first motor on their outer sides. The first motor is fixedly embedded in the flip shell.

[0022] Compared with the prior art, the present invention provides a method for sorting and conveying coal gangue by specifications, which has the following beneficial effects:

[0023] This invention includes n sets of density separation devices, the number of which can be set according to the user's actual needs. Different grades of gangue are separated by configuring different flotation solution concentrations. The density separation device also includes a low-carbon gangue transfer component, which effectively transfers gangue that does not meet the grade requirements. Simultaneously, the outflowing flotation solution is returned to the density separation device via a circulation pump, ensuring separation efficiency while reducing costs. Furthermore, a high-carbon gangue lifting component is included, which forms a lifting net after separation and, with the assistance of a high-carbon gangue turning component, completes the transfer of gangue that meets the grade requirements. This saves manpower and resources while further improving gangue separation efficiency. Attached Figure Description

[0024] Figure 1 A schematic diagram of a coal mine gangue sorting and conveying structure.

[0025] Figure 2 A schematic diagram of a coal mine gangue sorting, conveying, and density sorting device.

[0026] Figure 3 A schematic diagram of a low-carbon gangue transfer assembly for sorting and conveying gangue in coal mines.

[0027] Figure 4 A schematic diagram of a high-carbon gangue lifting assembly for sorting and conveying gangue in coal mines.

[0028] In the diagram: 1. Input conveyor belt; 2. Density sorting device; 3. Gangue conveyor belt; 4. Transfer conveyor belt; 5. Waste output belt; 21. Device support; 22. Low-carbon gangue transfer assembly; 23. High-carbon gangue lifting assembly; 24. High-carbon gangue turning assembly; 25. Hydraulic rod; 26. Circulating pump; 221. Fixed housing; 222. First pusher blade; 223. First partition plate; 224. Second pusher blade; 225. Second partition plate. 226. Stone dropper; 227. Liquid dropper plate; 228. Material dropper; 229. Flotation liquid circulation chamber; 231. Lifting shell; 232. Internal gear ring; 233. First motor; 234. Transmission gear; 235. Lifting screw; 236. Lifting nut; 237. Longitudinal mesh rod; 238. Transverse mesh rod; 239. Tilting shell; 2351. Cylindrical section; 2352. First threaded section; 2353. Second threaded section. Detailed Implementation

[0029] Please see Figures 1-4 This invention provides a method for sorting and conveying coal gangue by specifications, comprising:

[0030] The input conveyor belt 1 is placed horizontally on the ground. A raw material conveying device is connected to its right side, and a density sorting device 2 is fixedly placed on its left side. There are n groups of density sorting devices 2 arranged horizontally, and a transfer conveyor belt 4 is fixedly placed between each pair of the n groups of density sorting devices 2. A waste output belt 5 is fixedly placed on the left side of the leftmost density sorting device 2.

[0031] The gangue conveyor belt 3 is fixedly placed in front of each density sorting device 2;

[0032] In a preferred embodiment, n in the n groups of density sorting devices 2 is a positive integer greater than or equal to one, and its value is equal to the grade number of the carbon content of the coal gangue set before sorting. During operation, the value of n is determined according to the actual situation, and an appropriate number of density sorting devices 2, gangue conveyor belts 3 and primary transfer conveyor belts 4 are placed. The gangue raw material is conveyed to the density sorting device 2 through the input conveyor belt 1. The density sorting device 2 flips the gangue that meets the grade requirements from above onto the corresponding gangue conveyor belt 3, while the gangue that does not meet the grade requirements falls from below onto the transfer conveyor belt 4, which then conveys it to the next level density sorting device 2 for sorting, until it reaches the leftmost group of density sorting devices 2. At this time, the material falling below is the waste with a lower carbon content, which is conveyed to the designated position by the left waste output belt 5.

[0033] Furthermore, each of the density sorting devices 2 contains flotation liquids of different densities, with the density of the flotation liquids decreasing sequentially from right to left, and the density of the flotation liquids being equal to the lowest density of the gangue grade screened in the corresponding density sorting device 2.

[0034] In a preferred embodiment, when the rock quality is the same, the higher the carbon content of the gangue, the lower its average density. By utilizing the different densities of gangue with different carbon content grades, a flotation solution with a relative density is prepared. The density of the flotation solution is equal to the lowest density of the gangue grade screened in the density separation device 2. During separation, gangue that meets the grade requirement floats above the density separation device 2 because its density is less than or equal to the density of the flotation solution, while gangue that does not meet the grade requirement settles at the bottom of the density separation device 2 because its density is greater than the density of the flotation solution.

[0035] Furthermore, the density sorting device 2 includes:

[0036] The device support 21 is placed horizontally on the ground, and a low-carbon gangue transfer component 22 is fixedly mounted on it. A high-carbon gangue lifting component 23 is coaxially fixedly mounted above the low-carbon gangue transfer component 22. A high-carbon gangue turning component 24 is rotatably mounted above the high-carbon gangue lifting component 23. A hydraulic rod 25 is rotatably mounted between the high-carbon gangue turning component 24 and the high-carbon gangue lifting component 23.

[0037] In a preferred embodiment, when the gangue falls into the density sorting device 2, the gangue that meets the carbon content grade requirements of the density sorting device 2 floats above the flotation liquid inside and is lifted to the top of the density sorting device 2 by the high-carbon gangue lifting component 23. Then, the high-carbon gangue turning component 24 turns it over to the corresponding transfer conveyor belt 4. The gangue that does not meet the carbon content grade requirements of the density sorting device 2 settles at the bottom of the flotation liquid inside and is dropped onto the transfer conveyor belt 4 or the waste output belt 5 by the low-carbon gangue transfer component 22 inside, for further sorting or to end the sorting process.

[0038] Furthermore, the low-carbon gangue transfer component 22 includes:

[0039] A fixed shell 221 is fixedly mounted above the device bracket 21. A first partition plate 223 and a second partition plate 225 are coaxially fixedly mounted inside the shell. A drive motor is fixedly mounted above the first partition plate 223, and a first pusher blade 222 is coaxially fixedly mounted on its output shaft.

[0040] The second partition plate 225 is fixedly mounted on the upper surface of the second drive motor, and the second pusher blade 224 is fixedly mounted on its output shaft.

[0041] Furthermore, the first partition plate 223 and the second partition plate 225 are respectively set as fan-shaped plates of 225° and 315°. The other 45° area of ​​the second partition plate 225 is set as a rockfall outlet 226, and a liquid discharge plate 227 is provided at a counterclockwise interval of 45° from the rockfall outlet 226. The 45° area between the rockfall outlet 226 and the liquid discharge plate 227 is located directly below the fan-shaped plate area of ​​the first partition plate 223.

[0042] In a preferred embodiment, the positions where the second pusher blade 224 contacts other components are covered with rubber strips to minimize gaps at the connection points between the second pusher blade 224 and other components, thus preventing flotation liquor leakage. In operation, drive motor one and drive motor two remain open, ensuring that the first pusher blade 222 and the second pusher blade 224 always rotate clockwise. The first partition plate 223 and the second partition plate 225 on both sides of the drop outlet 226 and the liquid drop plate 227 are solid plates at a 45° angle, which can effectively prevent flotation liquor leakage during the rotation of the second pusher blade 224.

[0043] Furthermore, a material discharge cylinder 228 is fixedly installed below the rock discharge port 226, and the input end of the gangue conveyor belt 3 or waste output belt 5 is provided below the material discharge cylinder 228. The area below the second partition plate 225, other than the material discharge cylinder 228, is set as a flotation liquid circulation chamber 229, and a circulation pump 26 is fixedly installed on its bottom side wall. The other end of the circulation pump 26 is set on the upper side of the high carbon gangue lifting component 23.

[0044] In a preferred embodiment, during operation, non-compliant gangue falls onto the first partition 223 or the second partition 225. The gangue on the first partition 223, pushed by the first pusher blade 222, eventually falls onto the second partition 225. The gangue on the second partition 225 is then divided into 45° compartments by the blades of the second pusher blade 224. Under the push of the second pusher blade 224, each compartment rotates clockwise. When it coincides with the leftmost region of the first partition 223, the compartment... When the compartment is in a closed state, it contains flotation liquid and gangue. As it continues to rotate, the lower part of the compartment gradually overlaps with the liquid discharge plate 227. The flotation liquid falls through the holes on it into the flotation liquid circulation chamber 229 below, and then returns to the density separation device 2 above via the external circulation pump 26, realizing the recycling of the flotation liquid. As it continues to rotate, the compartment assembly reaches the rock discharge port 226 and rotates continuously. The gangue inside falls through the discharge cylinder 228 onto the transfer conveyor belt 4 or waste output belt 5 below it.

[0045] Furthermore, the high-carbon gangue lifting assembly 23 includes:

[0046] The lifting housing 231 is coaxially fixedly mounted on the upper end of the low-carbon gangue transfer assembly 22. An internal gear ring 232 is rotatably mounted on the inner wall of its bottom. A first motor 233 is meshed on the outer side of the internal gear ring 232. The first motor 233 is fixedly embedded in the lifting housing 231. Multiple sets of lifting transmission gears 234 are irregularly meshed on the inner side of the internal gear ring 232. A lifting screw 235 is coaxially fixedly mounted above each set of transmission gears 234.

[0047] Furthermore, the lifting screw 235 is divided into three parts from bottom to top: a cylindrical section 2351, a first threaded section 2352, and a second threaded section 2353. The combined length of the cylindrical section 2351 and the first threaded section 2352 of each lifting screw 235 is equal to the length of the second threaded section 2353. A one-way bearing is provided at the bottom of the first threaded section 2352, and its outer side is covered with a thread that mates with it. A rising nut 236 is threaded on the first threaded section 2352.

[0048] Furthermore, the rising nut 236 is slidably assembled inside the side wall of the lifting housing 231, and a longitudinal mesh rod 237 or a transverse mesh rod 238 is fixedly assembled between every two sets of rising nuts 236 of equal height.

[0049] In a preferred embodiment, the distance between the upper and lower sets of the longitudinal mesh rods 237 or the transverse mesh rods 238 is equal and is a times the pitch of the lifting screw 235 (a is a positive integer). The first threaded section 2352 and the second threaded section 2353 of the lifting screw 235 are coaxially rotatably connected. When the lifting screw 235 rotates clockwise, the rising nut 236 mounted on it rises; when it rotates counterclockwise, the rising nut 236 falls, and the one-way bearing locks when rotating clockwise. The transverse mesh rods 238 and the longitudinal mesh rods 237 are distributed vertically and symmetrically arranged front-to-back or left-to-right. In the initial state, the transverse mesh rods 238 and the longitudinal mesh rods 237, as well as the rising nuts 236 at both ends, are located at the one-way bearings of their corresponding lifting screws 235, and the liquid level of the flotation liquid inside them is higher than the uppermost end of the first threaded section 2352. During sorting, the staggered transverse mesh rods 238 and the longitudinal mesh rods 237... The screen bar 237 effectively prevents gangue from getting stuck on the horizontal screen bar 238 or the vertical screen bar 237. After the sorting is completed, the first motor 233 is started, which drives the internal gear ring 232 to rotate clockwise. The transmission gear 234 meshing with it rotates clockwise, the lifting screw 235 rotates clockwise, and the lifting nut 236 rises. At the same time, the horizontal screen bar 238 and the vertical screen bar 237 rise until the uppermost horizontal screen bar 238 meshes with the second threaded section 2353. At this time, the horizontal screen bar 238 stops, and the first threaded section 2352 of the corresponding lifting screw 235 idles under the action of the transmission gear 234 until the lowermost vertical screen bar 237 meshes with the second threaded section 2353. All the vertical screen bars 237 and the horizontal screen bars 238 form a lifting screen, which is located at the bottom of the second threaded section 2353 and below the surface of the flotation liquid. The first motor 233 then stops rotating.

[0050] Furthermore, the high-carbon gangue overturning assembly 24 includes:

[0051] The flip shell 239 has multiple sets of second threaded sections 2353 of lifting screws 235 fixedly mounted on it, and each set of second threaded sections 2353 has a transmission gear 234 fixedly mounted on its upper end. The multiple sets of transmission gears 234 have an internal gear ring 232 meshing with their outer sides, and a first motor 233 meshing with their outer sides. The first motor 233 is fixedly embedded in the flip shell 239.

[0052] In a preferred embodiment, when the longitudinal mesh rod 237 and the transverse mesh rod 238 form a lifting mesh, the first motor 233 on the tilting shell 239 starts. Under the transmission of the internal gear ring 232 and the transmission gear 234, the second thread section 2353 of the lifting screw 235 on it rotates clockwise, the lifting mesh rises as a whole, and lifts the qualified gangue floating above the flotation liquid away from the surface of the flotation liquid until it reaches its limit position and the gangue is completely separated from the flotation liquid. Then, the hydraulic rod 25 is activated to retract, and the high-carbon gangue tilting component 24 tilts until it pours the gangue in the lifting mesh onto the corresponding gangue conveyor belt 3 and stops, returning to the initial position. At this time, the first motor 233 on the tilting shell 239 is activated. Motor 233 reverses, causing the lifting mesh to gradually engage fully with the corresponding first threaded section 2352 of the lifting screw 235 under the drive of the second threaded section 2353 of the lifting screw 235. At this time, the second threaded section 2353 of the lifting screw 235 idles, stopping the first motor 233 on the rotating shell 239. The first motor 233 on the high-carbon gangue lifting assembly 23 reverses, and the lifting mesh gradually descends until it reaches the initial position of the original uppermost transverse mesh rod 238. Under the action of the one-way bearing at this point, the transverse mesh rod 238 remains relatively stationary, while the remaining longitudinal mesh rods 237 and transverse mesh rods 238 continue to descend until they return to their initial positions, completing the sorting work of gangue at this grade.

[0053] In practice, the following steps are included: During operation, the value of n is determined according to the actual situation, and an appropriate number of density sorting devices 2, gangue conveyor belts 3 and primary transfer conveyor belts 4 are placed. The gangue raw material is conveyed to the density sorting device 2 through the input conveyor belt 1. The density sorting device 2 flips the gangue that meets the grade requirements onto the corresponding gangue conveyor belt 3 through the high-carbon gangue lifting component 23 and the high-carbon gangue turning component 24. The gangue that does not meet the grade requirements falls onto the transfer conveyor belt 4 through the low-carbon gangue transfer component 22, and is then conveyed to the next level density sorting device 2 for sorting until it reaches the leftmost set of density sorting devices 2. At this time, the waste material with low carbon content that falls below it is conveyed to the designated position by the left waste output belt 5.

[0054] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A coal mining gangue specification sorting and conveying device, characterized in that: The utility model relates to a gangue sorting device, including: The input conveying belt (1) is horizontally placed on the ground, and the right side is circumscribed with raw material conveying device, and the left side is fixedly placed with density sorting device (2), the density sorting device (2) is horizontally arranged with n groups, and the n group density sorting device (2) is fixedly placed with transfer conveyor belt (4) between two two, and the left side of the leftmost density sorting device (2) is fixedly placed with waste output belt (5); The gangue conveying belt (3) is fixedly placed in front of each group of density sorting device (2); The density sorting device (2) includes: The device support (21) is horizontally placed on the ground, and the low carbon gangue transfer assembly (22) is fixedly assembled on it, the high carbon gangue lifting assembly (23) is coaxially fixedly assembled above the low carbon gangue transfer assembly (22), the high carbon gangue turnover assembly (24) is rotatably assembled above the high carbon gangue lifting assembly (23), and the hydraulic rod (25) is rotatably assembled between the high carbon gangue turnover assembly (24) and the high carbon gangue lifting assembly (23); The low carbon gangue transfer assembly (22) includes: The fixed shell (221) is fixedly assembled above the device support (21), the first spacing plate (223) and the second spacing plate (225) are coaxially fixedly assembled in it, the driving motor one is fixedly assembled above the first spacing plate (223), and the first stone leaf (222) is coaxially fixedly assembled on the output shaft of the driving motor one; The second spacing plate (225) is fixedly assembled with the driving motor two on the upper surface, and the second stone leaf (224) is coaxially fixedly assembled on the output shaft of the driving motor two; The high carbon gangue lifting assembly (23) includes: The lifting shell (231) is coaxially fixedly assembled on the upper end of the low carbon gangue transfer assembly (22), the inner gear ring (232) is rotatably assembled on the bottom inner wall of the lifting shell (231), the first motor (233) is engagedly assembled on the outer side of the inner gear ring (232), the first motor (233) is fixedly embedded on the lifting shell (231), a plurality of lifting transmission gears (234) are irregularly engaged on the inner side of the inner gear ring (232), and the lifting lead screws (235) are coaxially fixedly assembled above each group of transmission gears (234); The high carbon gangue turnover assembly (24) includes: The turnover shell (239) is fixedly assembled with the second thread section (2353) of a plurality of lifting lead screws (235) thereon, the transmission gears (234) are fixedly assembled on the upper end of each group of second thread sections (2353), a plurality of transmission gears (234) are engagedly assembled on the outer side of the inner gear ring (232), the first motor (233) is engagedly assembled on the outer side of the inner gear ring (232), and the first motor (233) is fixedly embedded on the turnover shell (239).

2. The coal mining gangue specification sorting and conveying device according to claim 1, characterized in that: Each group of density sorting device (2) is filled with different density floatation liquid, the density of floatation liquid gradually reduces from right to left, and the density of floatation liquid is equal to the lowest density of the gangue grade screened in the corresponding density sorting device (2).

3. The coal mining gangue size sorting and conveying device according to claim 1, characterized in that: The first spacing plate (223) and the second spacing plate (225) are respectively arranged as 225° and 315° sector plates, the second spacing plate (225) is additionally arranged as a rockfall opening (226) in a 45° area, and the rockfall opening (226) is provided with a liquid falling hole plate (227) at a position 45° away in the counterclockwise direction, and the 45° area between the rockfall opening (226) and the liquid falling hole plate (227) is directly below the sector plate area of the first spacing plate (223).

4. The coal mining gangue size sorting and conveying device according to claim 3, characterized in that: The rockfall opening (226) is fixedly provided with a falling cylinder (228) below, the falling cylinder (228) is provided with an input end of the gangue conveying belt (3) or the waste output belt (5) below, and the area below the second spacing plate (225) and outside the falling cylinder (228) is arranged as a flotation liquid circulating chamber (229), and a circulating pump (26) is fixedly provided on the bottom side wall of the flotation liquid circulating chamber (229), and the other end of the circulating pump (26) is arranged on the upper side of the high-carbon gangue lifting assembly (23).

5. The coal mining gangue specification sorting and conveying device according to claim 1, characterized in that: The lifting lead screw (235) is divided into three parts from bottom to top, namely a cylindrical section (2351), a first threaded section (2352) and a second threaded section (2353), and the length of the cylindrical section (2351) and the first threaded section (2352) of each group of lifting lead screws (235) is equal to the length of the second threaded section (2353), the lowermost part of the first threaded section (2352) is provided with a one-way bearing, the outer side of which is covered with a thread matched therewith, and the first threaded section (2352) is threadedly provided with a lifting nut (236).

6. The coal mining gangue specification sorting and conveying device according to claim 5, characterized in that: The lifting nut (236) is slidingly provided in the side wall of the lifting shell (231), and longitudinal net rods (237) or transverse net rods (238) are fixedly provided between every two groups of equal-height lifting nuts (236).

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