Coal sorting device for coal power equipment

Abstract

A coal sorting device for coal power equipment relates to the field of coal sorting and comprises a feeding mechanism and a pneumatic sorting mechanism. The feeding hopper is arranged at the top feeding end of the coarse screening box, the coarse screening plate is arranged in the coarse screening box, a material conveying pipe is arranged at the discharging end of the coarse screening box, the pneumatic sorting mechanism is used for conducting negative-pressure screening on sorted materials and fine materials, a fine material guiding-out assembly is arranged at the discharging end of the negative-pressure fan, and a sorted material guiding-out assembly is arranged at the bottom of the sorting cylinder. According to the coal sorting device for the coal power equipment, sorted materials and fine materials are intensively sucked away and transferred through the negative pressure fan; dust is also absorbed by negative-pressure airflow in the coarse screening process, and dust cannot be generated; fine materials enter the sorting cylinder and are filtered for the second time through the fine material screening plate, and the fine materials are filtered out. The selected materials are stirred and ground by the stirring rod in the separation cylinder, fine materials and edges and corners attached to the surfaces of the selected materials are effectively ground, the fine materials in the selected materials are reduced to the minimum, impurities in the selected materials are reduced, and the purpose of fine separation of the coal materials is achieved.

Description

A coal sorting device for coal-fired power equipment Technical Field

[0001] This invention relates to the field of coal sorting technology, and in particular to a coal sorting device for coal-fired power equipment. Background Technology

[0002] In the coal-fired power generation process, coal sorting is a crucial preliminary step to ensure power generation efficiency and reduce equipment wear. After raw coal is mined, it needs to be crushed and then screened and graded by a sorting device to remove gangue, impurities, and coal particles of unqualified size. Coal that meets the combustion requirements of coal-fired power equipment is then transported and burned in subsequent processes, while unqualified coal is returned to the crushing system for secondary processing or disposed of separately. This improves coal utilization and reduces problems such as furnace coking and equipment wear.

[0003] However, coal sorting technology still faces challenges in screening techniques. On the one hand, dust generated during coal screening is difficult to collect, resulting in serious dust pollution that affects both the environment and the health of operators. On the other hand, the coal to be collected during the sorting process (hereinafter referred to as the sorted material) is easily mixed with fine particles. Due to the fine particles adsorbed on the surface of the sorted material, and the mutual squeezing and grinding during the later transportation process, new fine particles will be generated, thus affecting the quality of coal sorting. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, the purpose of this invention is to provide a coal sorting device for coal-fired power equipment, which does not generate dust during the sorting process, reduces impurities in the sorted material, and achieves the purpose of fine coal sorting.

[0006] To achieve the above objectives, this invention proposes a coal sorting device for coal-fired power equipment, comprising a feeding mechanism and a pneumatic sorting mechanism. The feeding mechanism includes a feed hopper, a coarse screen box, and a coarse screen plate. The feed hopper is located at the top feed end of the coarse screen box, and the coarse screen plate is located inside the coarse screen box for screening coarse materials. A material transmission pipe is provided at the discharge end of the coarse screen box. The pneumatic sorting mechanism is used for negative pressure screening of selected and fine materials. The pneumatic sorting mechanism includes a sorting cylinder, a negative pressure fan, and a fine material screen plate. The feed end of the sorting cylinder is connected to the output end of the material transmission pipe. A stirring rod is provided inside the sorting cylinder. The fine material screen plate is located on the side wall of the sorting cylinder, and a guide air hood is provided on the outside of the fine material screen plate. The negative pressure fan is located at the air outlet of the guide air hood, and a fine material discharge assembly is provided at the discharge end of the negative pressure fan. A material discharge assembly is provided at the bottom of the sorting cylinder.

[0007] Furthermore, the sorting cylinder has an inverted conical structure, the discharge end of the material conveying pipe is tangent to the circumferential surface of the sorting cylinder, and the inner wall of the sorting cylinder is provided with a raised grinding protrusion.

[0008] Furthermore, the material selection and output component includes a material selection receiving seat, a material selection conveyor belt, and a material selection collection box, wherein the material selection receiving seat is disposed at the bottom of the sorting cylinder, the material selection conveyor belt is disposed inside the material selection receiving seat, and the material selection collection box is disposed below the material selection conveyor belt.

[0009] Furthermore, the material selection conveyor belt is equipped with an airtight scraper, which is adapted to the inner wall of the material selection receiving seat.

[0010] Furthermore, the fine material discharge assembly includes a blower, an elastic filter, and a fine material collection box, wherein one end of the elastic filter is connected to the air outlet of the negative pressure blower, the blower is sleeved on the outside of the elastic filter, and the fine material collection box is disposed at the discharge end of the elastic filter.

[0011] Furthermore, the other end of the elastic filter screen is provided with a discharge connector, the discharge connector is provided with a fine material discharge valve, the fine material collection box is provided at the discharge end of the fine material discharge valve, a quick-release connector is provided between the fine material collection box and the discharge connector, a fine material conveyor belt is provided inside the fine material collection box, and an exhaust port is provided at the top of the fine material collection box.

[0012] Furthermore, the inner wall of the air duct is provided with strip-shaped raised air grooves, the elastic filter is a tubular structure, the elastic filter is made of stretched filter material, and the exhaust end of the air duct is provided with an air outlet.

[0013] Furthermore, the bottom of the feed hopper is provided with a discharge conveyor belt, the surface of the discharge conveyor belt is provided with a scraper, the coarse screen plate is inclined, an elastic seat is provided between the edge of the coarse screen plate and the coarse screen box, a vibrating push rod is provided at the bottom of the coarse screen plate, an air inlet hood is provided on the coarse screen box, and a coarse material outlet is opened at the bottom of the coarse screen plate.

[0014] Furthermore, a stirring motor is provided at the top of the sorting cylinder, the power shaft of the stirring motor is connected to the stirring rod, and a cleaning brush is provided at the end of the stirring rod.

[0015] Furthermore, the surface of the fine material sieve plate is smoothly connected to the conical sidewall of the sorting cylinder, and the negative pressure fan is located at the bottom of the air guide hood.

[0016] Beneficial effects: This invention uses a coarse screen plate to perform initial screening of coal, and a negative pressure fan to concentrate and transfer the selected and fine materials; during the coarse screening process, dust is also absorbed by the negative pressure airflow, so no dust is generated; the fine materials are filtered out by a fine material screen plate in the sorting cylinder; the selected materials are stirred and ground by the stirring rod in the sorting cylinder, which effectively grinds the fine materials and edges attached to the surface of the selected materials, so as to minimize the fine materials in the selected materials, reduce impurities in the selected materials, and achieve the purpose of fine coal sorting.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, in which: FIG1 is a schematic diagram of the overall structure of a coal sorting device for coal-fired power equipment according to an embodiment of the present invention; FIG2 is a schematic diagram of the structure of a fine material discharge assembly and a sorting material discharge assembly in a coal sorting device for coal-fired power equipment according to an embodiment of the present invention; FIG3 is a front sectional view of a feeding mechanism in a coal sorting device for coal-fired power equipment according to an embodiment of the present invention; FIG4 is a front sectional view of a pneumatic sorting mechanism in a coal sorting device for coal-fired power equipment according to an embodiment of the present invention; FIG5 is an enlarged view of A in FIG4; FIG6 is a right sectional view of a ventilation duct in a coal sorting device for coal-fired power equipment according to an embodiment of the present invention; FIG7 is a top sectional view of a sorting cylinder in a coal sorting device for coal-fired power equipment according to an embodiment of the present invention.

[0019] As shown in the figure: 1. Feeding mechanism; 11. Feed hopper; 12. Coarse screen box; 13. Discharge drive motor; 14. Coarse material outlet; 15. Air inlet hood; 16. Feeding nozzle; 17. Discharge conveyor belt; 171. Scraper; 18. Coarse screen plate; 181. Elastic seat; 182. Vibrating push rod; 19. Material conveying pipe; 191. Conveyor pipe outlet; 2. Pneumatic sorting mechanism; 21. Agitator motor; 22. Sorting cylinder; 221. Grinding protrusion; 23. Air guide hood; 231. Fine material screen plate; 24. Negative pressure fan; 25. Material receiving seat. 251. Support frame; 26. Fine material discharge assembly; 261. Air duct; 2611. Air channel; 262. Discharge connector; 263. Exhaust port; 264. Fine material collection box; 265. Fine material conveyor belt; 266. Elastic filter screen; 267. Fine material discharge valve; 268. Air duct outlet; 269. Quick-release connector; 27. Selective material discharge assembly; 271. Selective material outlet; 272. Selective material conveyor belt; 273. Selective material collection box; 274. Bin door; 275. Airtight scraper; 28. Agitator rod; 281. Cleaning brush; 3. Base plate. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] The coal sorting device for coal-fired power equipment according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0022] As shown in Figures 1-4, the coal sorting device for coal-fired power equipment provided in this embodiment of the invention includes a feeding mechanism 1 and a pneumatic sorting mechanism 2. The feeding mechanism 1 includes a feed hopper 11, a coarse screen box 12 and a coarse screen plate 18. The feed hopper 11 is located at the top feed end of the coarse screen box 12, and the coarse screen plate 18 is located inside the coarse screen box 12. The coarse screen plate 18 is used to screen coarse materials. The discharge end of the coarse screen box 12 is provided with a material transmission pipe 19, and an air inlet hood 15 is provided on the coarse screen box 12.

[0023] The pneumatic sorting mechanism 2 is used for negative pressure screening of materials and fine materials. The pneumatic sorting mechanism 2 includes a sorting cylinder 22, a negative pressure fan 24, and a fine material screen plate 231. The feed end of the sorting cylinder 22 is connected to the output end of the material transmission pipe 19. A stirring rod 28 is installed inside the sorting cylinder 22. The fine material screen plate 231 is installed on the side wall of the sorting cylinder 22. A guide air hood 23 is installed on the outside of the fine material screen plate 231. The negative pressure fan 24 is installed at the air outlet of the guide air hood 23. A fine material discharge component 26 is installed at the discharge end of the negative pressure fan 24. A material discharge component 27 is installed at the bottom of the sorting cylinder 22.

[0024] Specifically, in the coal sorting process, the material to be sorted is first placed in the feed hopper 11. The material falls down into the coarse screen box 12 along the feed hopper 11. The selected material, fine material and dust in the coal pass through the coarse screen plate 18 and fall below the coarse screen plate 18. At this time, the negative pressure fan 24 works to generate negative pressure airflow in the guide air hood 23, the sorting cylinder 22, the material transmission pipe 19 and the inside of the coarse screen box 12. Air is drawn in from the air inlet hood 15 on the coarse screen box 12. The air carries the selected material, fine material and dust and is drawn into the sorting cylinder 22 through the material transmission pipe 19. The fine material and dust are filtered and transferred through the fine material screen plate 231. The selected material is rotated and stirred in the sorting cylinder 22 by the stirring rod 28, so that the surfaces of the selected material come into contact and grind each other, which can grind away the fine material and sharp edges on the surface of the selected material, reducing the residue of fine material during the later transportation process. Finally, the selected material is discharged through the material discharge component 27 at the bottom of the sorting cylinder 22, and the fine material and dust absorbed by the negative pressure fan 24 are collected through the fine material discharge component 26.

[0025] In one embodiment of the present invention, as shown in Figures 1, 4 and 7, the sorting cylinder 22 has an inverted conical structure, the outlet 191 of the material transfer pipe 19 is tangent to the circumferential surface of the sorting cylinder 22, and the inner wall of the sorting cylinder 22 is provided with a plurality of raised grinding protrusions 221.

[0026] Specifically, in order to fully grind and peel off the fine material on the surface of the material being selected, the material transfer pipe 19 is tangentially connected to the circumferential surface of the sorting cylinder 22. In this way, the material being transported at high speed in the material transfer pipe 19 will rotate along the tangential direction after entering the sorting cylinder 22. Since the sorting cylinder 22 has an inverted conical structure, this ensures that the material being selected has sufficient upward support force during the centrifugal rotation process in the sorting cylinder 22, prolonging the contact time between the material being selected and the inner wall of the sorting cylinder 22. This allows the material to be fully ground by the grinding protrusions 221 on the inner wall of the sorting cylinder 22, and also allows the fine material and dust to be fully filtered out by the fine material screen plate 231.

[0027] In one embodiment of the present invention, as shown in Figures 2 and 4, the material selection and discharge assembly 27 includes a material selection receiving seat 25, a material selection conveyor belt 272, and a material selection collection box 273. The material selection receiving seat 25 has a support frame 251 at its bottom and is located at the bottom of the sorting cylinder 22. The material selection conveyor belt 272 is located inside the material selection receiving seat 25, and the material selection collection box 273 is located below the material selection conveyor belt 272. An airtight scraper 275 is provided on the material selection conveyor belt 272, and the airtight scraper 275 is adapted to the inner wall of the material selection receiving seat 25.

[0028] Specifically, when the sorting cylinder 22 is under negative pressure, in order to prevent external airflow from entering the sorting receiving seat 25, a sorting conveyor belt 272 is set on the sorting receiving seat 25, and an airtight scraper 275 is set on the sorting conveyor belt 272. In this way, the airtight scraper 275 makes the inside and outside of the sorting receiving seat 25 airtightly isolated during the process of transferring the sorted material in the sorting receiving seat 25, preventing air from entering the sorting receiving seat 25 and affecting the negative pressure suction of the material transfer pipe 19. Finally, the sorted material is discharged from the sorting outlet 271.

[0029] In one embodiment of the present invention, as shown in Figures 4-6, the fine material discharge assembly 26 includes a duct 261, an elastic filter 266, and a fine material collection box 264. One end of the elastic filter 266 is connected to the outlet end of the negative pressure fan 24. The duct 261 is sleeved on the outside of the elastic filter 266, and the fine material collection box 264 is located at the outlet end of the elastic filter 266. The inner wall of the duct 261 is provided with strip-shaped raised air grooves 2611. The elastic filter 266 has a tubular structure and is made of stretched filter material. The exhaust end of the duct 261 is provided with a duct outlet 268.

[0030] Specifically, after the fine material mixed with air is drawn into the negative pressure fan 24, the fine material enters the interior of the elastic filter 266. The airflow expands the elastic filter 266, and the air filtered by the elastic filter 266 is transported between the air ducts 2611. Finally, the clean air is discharged from the air outlet 268 of the air duct. Since the elastic filter 266 fills the air ducts 2611, the filtration area is increased, and the air is discharged more quickly. This makes the airflow of the negative pressure fan 24 smoother, reduces the impact on the suction force of the negative pressure fan 24, and the fine material is filtered faster.

[0031] In one embodiment of the present invention, as shown in FIG4, the other end of the elastic filter screen 266 is provided with a discharge connector 262, the discharge connector 262 is provided with a fine material discharge valve 267, the fine material collection box 264 is provided at the discharge end of the fine material discharge valve 267, a quick-release connector 269 is provided between the fine material collection box 264 and the discharge connector 262, the fine material collection box 264 is provided with a fine material conveyor belt 265 inside, and an exhaust port 263 is provided on the top of the fine material collection box 264.

[0032] Specifically, the fine material inside the elastic filter 266 is continuously pushed to the left by the airflow into the discharge connector 262. When a certain amount of fine material is stored in the elastic filter 266 and the discharge connector 262, the fine material discharge valve 267 on the discharge connector 262 is opened. The airflow inside the elastic filter 266 pushes the fine material to be discharged quickly into the fine material collection box 264. The fine material falls to the bottom of the fine material collection box 264 due to gravity. The air discharged into the fine material collection box 264 is discharged through the exhaust port 263 at the top of the fine material collection box 264. Then the fine material discharge valve 267 is closed, and the elastic filter 266 continues to collect fine material.

[0033] The sorting device of the present invention has a base plate 3 at its bottom. Both the fine material collection box 264 and the sorting material collection box 273 are mounted on the base plate 3. The fine material in the fine material collection box 264 is transferred via a fine material conveyor belt 265. Furthermore, the bottoms of both the fine material collection box 264 and the sorting material collection box 273 can be moved on the base plate 3 by drive wheels, allowing for timely material transfer. A quick-release connector 269 between the fine material collection box 264 and the discharge connector 262 facilitates separation of the fine material collection box 264 and the discharge connector 262, allowing for easy transfer of the fine material collection box 264. A door 274 is provided on one side of the sorting material collection box 273 for easy unloading of the sorted material.

[0034] In one embodiment of the present invention, as shown in FIG3, a discharge conveyor belt 17 is provided at the bottom of the feed hopper 11, a scraper 171 is provided on the surface of the discharge conveyor belt 17, a coarse screen plate 18 is inclined, an elastic seat 181 is provided between the edge of the coarse screen plate 18 and the coarse screen box 12, a vibrating push rod 182 is provided at the bottom of the coarse screen plate 18, and a coarse material outlet 14 is opened at the bottom of the coarse screen plate 18.

[0035] Specifically, the scraper 171 on the surface of the discharge conveyor belt 17 can block the feeding nozzle 16 at the bottom of the feed hopper 11. The discharge conveyor belt 17 rotates through the discharge drive motor 13. When the discharge conveyor belt 17 rotates, the scraper rotates to sweep and transfer the coal material in the feeding nozzle 16, thereby controlling the output of coal material.

[0036] During the initial screening of coal, the coarse screen plate 18 blocks the coarse material. The coarse material rolls down along the inclined coarse screen plate 18 and is eventually discharged from the coarse material outlet 14. In order to prevent the coarse material from getting stuck on the coarse screen plate 18, a vibrating push rod 182 is set at the bottom of the coarse screen plate 18 to make the coarse screen plate 18 vibrate up and down, thus preventing the coarse material from getting stuck on the coarse screen plate 18. Vibration can also accelerate the selection of materials and the passage of fine materials through the coarse screen plate 18. The edge of the coarse screen plate 18 is separated from the coarse screen box 12 by the elastic seat 181, so as not to affect the up and down vibration of the coarse screen plate 18.

[0037] In one embodiment of the present invention, as shown in FIG7, a stirring motor 21 is provided at the top of the sorting cylinder 22. The power shaft of the stirring motor 21 is connected to the stirring rod 28. A cleaning brush 281 is provided at the end of the stirring rod 28. The stirring rod 28 is driven to rotate by the stirring motor 21. The stirring rod 28 agitates the material to accelerate the rotation and grinding of the material. The cleaning brush 281 at the end of the stirring rod 28 cleans the material on the inner wall of the sorting cylinder 22 and the fine material screen plate 231, reducing the residue on the inner wall of the sorting cylinder 22 and preventing the fine material screen plate 231 from getting stuck.

[0038] In one embodiment of the present invention, as shown in FIG7, the surface of the fine material screen plate 231 is smoothly connected to the conical sidewall of the sorting cylinder 22, so that the material rotation is smoother during the material rotation process. The negative pressure fan 24 is set at the bottom of the air guide hood 23, and the fine material can be effectively sucked in completely by the negative pressure fan 24 under the action of airflow and its own gravity.

[0039] To clearly illustrate the above embodiments, referring to Figures 1-7, the specific working principle of the coal sorting device for coal-fired power equipment of the present invention is as follows: During coal sorting, the material to be sorted is first placed in the feed hopper 11. Subsequently, the material enters the feed nozzle 16 under gravity. At this time, the discharge drive motor 13 operates, driving the discharge conveyor belt 17 to rotate, which in turn causes the scraper plate 171 to rotate, scraping and transferring the coal in the feed nozzle 16, causing the coal to fall onto the coarse screen plate 18.

[0040] Fine and coarse materials can pass through the coarse screen plate 18, while coarse materials are blocked by the coarse screen plate 18. The coarse materials roll down the inclined coarse screen plate 18 and are eventually discharged from the coarse material outlet 14. The vibrating push rod 182 located at the bottom of the coarse screen plate 18 vibrates continuously, causing the coarse screen plate 18 to vibrate up and down, thereby accelerating the passage of fine and coarse materials through the coarse screen plate 18 and effectively preventing coarse materials from getting stuck on the coarse screen plate 18.

[0041] As the coal material, including fine particles and dust, falls through the coarse screen plate 18 and below it, the negative pressure fan 24 starts working, creating negative pressure airflow in the guide hood 23, the sorting cylinder 22, the material transfer pipe 19, and the interior of the coarse screen box 12. Air is drawn in through the air inlet hood 15 on the coarse screen box 12, carrying the coal material, fine particles, and dust through the material transfer pipe 19 into the sorting cylinder 22. After entering the sorting cylinder 22, the material rotates along its cross-section. Because the sorting cylinder 22 has an inverted conical structure, it provides sufficient upward support for the material as it rotates and centrifugally within the cylinder. Simultaneously, the stirring motor 21 drives the stirring rod 28 to rotate, further accelerating the rotation of the material within the sorting cylinder 22. This prolongs the contact time between the material and the grinding protrusions 221 on the inner wall of the sorting cylinder 22, allowing for thorough grinding of the material and ensuring that fine particles and dust are effectively filtered out by the fine particle screen plate 231.

[0042] Subsequently, the selected material enters the material outlet assembly 27 at the bottom of the sorting cylinder 22 and is transferred via the material conveyor belt 272. Furthermore, the airtight scraper 275, during the transfer of material from the material receiving seat 25, ensures airtight isolation between the inside and outside of the material receiving seat 25, preventing outside air from entering and thus avoiding affecting the negative pressure suction of the material transfer pipe 19.

[0043] Fine particles mixed with air are drawn into the negative pressure fan 24 and enter the interior of the elastic filter 266. The airflow expands the elastic filter 266, and the filtered air is transported between the air channels 2611, finally being discharged clean air from the air outlet 268 of the air duct. Because the elastic filter 266 is distributed between the air channels 2611, its surface undergoes uneven deformation, increasing the filtration area and allowing air to be discharged more quickly. This ensures smoother airflow from the negative pressure fan 24, reduces the impact on the suction force of the negative pressure fan 24, and also accelerates the filtration speed of the fine particles.

[0044] As the fine material inside the elastic filter 266 is propelled to the left by the airflow into the discharge connector 262, once a certain amount of fine material has been stored in the elastic filter 266 and the discharge connector 262, the fine material discharge valve 267 on the discharge connector 262 opens, and the airflow inside the elastic filter 266 propels the fine material to be quickly discharged into the fine material collection box 264. The fine material falls to the bottom of the fine material collection box 264 under gravity, while the air entering the fine material collection box 264 is discharged through the exhaust port 263 at the top of the fine material collection box 264. Subsequently, the fine material discharge valve 267 closes, the elastic filter 266 continues to collect fine material, and then the fine material in the fine material collection box 264 is transferred out via the fine material conveyor belt 265.

[0045] In summary, the coal sorting device for coal-fired power equipment in this embodiment of the invention uses a negative pressure fan 24 to centrally suck away and transfer the selected materials and fine materials; during the coarse screening process, dust is also absorbed by the negative pressure airflow, so no dust is generated; the fine materials are filtered out by the fine material screen plate 231 after entering the sorting cylinder 22; the selected materials are stirred and ground by the stirring rod 28 in the sorting cylinder 22, which effectively grinds the fine materials and edges attached to the surface of the selected materials, so as to minimize the fine materials in the selected materials, reduce the impurities in the selected materials, and achieve the purpose of fine coal sorting.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A coal sorting device for coal-fired power equipment, characterized in that, The system includes a feeding mechanism (1) and a pneumatic sorting mechanism (2), wherein: the feeding mechanism (1) includes a feed hopper (11), a coarse screen box (12), and a coarse screen plate (18), wherein the feed hopper (11) is located at the top feed end of the coarse screen box (12), the coarse screen plate (18) is located inside the coarse screen box (12), the coarse screen plate (18) is used to screen coarse materials, and the discharge end of the coarse screen box (12) is provided with a material transmission pipe (19); the pneumatic sorting mechanism (2) includes a sorting cylinder (22), a negative pressure fan (24), and a fine material screen plate (231). The sorting cylinder (22) has its feed end connected to the output end of the material transfer pipe (19). The sorting cylinder (22) is equipped with a stirring rod (28). The fine material screen plate (231) is located on the side wall of the sorting cylinder (22). The fine material screen plate (231) is located on the outside of the fine material screen plate (231). The negative pressure fan (24) is located at the air outlet of the air outlet of the air outlet of the air outlet of the negative pressure fan (24). The negative pressure fan (24) is equipped with a fine material discharge assembly (26) at its discharge end. The sorting cylinder (22) is equipped with a material discharge assembly (27) at its bottom.

2. The coal sorting device for coal-fired power equipment according to claim 1, characterized in that, The sorting cylinder (22) has an inverted conical structure. The discharge end of the material transfer pipe (19) is tangent to the circumferential surface of the sorting cylinder (22). The inner wall of the sorting cylinder (22) is provided with a plurality of raised grinding protrusions (221).

3. The coal sorting device for coal-fired power equipment according to claim 1, characterized in that, The material selection and export component (27) includes a material selection receiving seat (25), a material selection conveyor belt (272), and a material selection collection box (273). The material selection receiving seat (25) is located at the bottom of the sorting cylinder (22), the material selection conveyor belt (272) is located inside the material selection receiving seat (25), and the material selection collection box (273) is located below the material selection conveyor belt (272).

4. The coal sorting device for coal-fired power equipment according to claim 3, characterized in that, An airtight scraper (275) is provided on the material selection conveyor belt (272), and the airtight scraper (275) is adapted to the inner wall of the material selection receiving seat (25).

5. The coal sorting device for coal-fired power equipment according to claim 1, characterized in that, The fine material discharge assembly (26) includes a duct (261), an elastic filter (266), and a fine material collection box (264). One end of the elastic filter (266) is connected to the air outlet of the negative pressure fan (24). The duct (261) is sleeved on the outside of the elastic filter (266). The fine material collection box (264) is located at the discharge end of the elastic filter (266).

6. The coal sorting device for coal-fired power equipment according to claim 5, characterized in that, The other end of the elastic filter screen (266) is provided with a discharge connector (262), the discharge connector (262) is provided with a fine material discharge valve (267), the fine material collection box (264) is provided at the discharge end of the fine material discharge valve (267), a quick-release connector (269) is provided between the fine material collection box (264) and the discharge connector (262), a fine material conveyor belt (265) is provided inside the fine material collection box (264), and an exhaust port (263) is provided on the top of the fine material collection box (264).

7. The coal sorting device for coal-fired power equipment according to claim 5, characterized in that, The inner wall of the air duct (261) is provided with a strip-shaped protruding air groove (2611), the elastic filter (266) is a tubular structure, the elastic filter (266) is made of a stretched filter, and the exhaust end of the air duct (261) is provided with an air duct outlet (268).

8. The coal sorting device for coal-fired power equipment according to claim 1, characterized in that, The bottom of the feed hopper (11) is provided with a discharge conveyor belt (17), the surface of the discharge conveyor belt (17) is provided with a scraper (171), the coarse screen plate (18) is inclined, the edge of the coarse screen plate (18) is provided with an elastic seat (181) between it and the coarse screen box (12), and the bottom of the coarse screen plate (18) is provided with a vibrating push rod (182); the coarse screen box (12) is provided with an air inlet hood (15), and the bottom of the coarse screen plate (18) is provided with a coarse material outlet (14).

9. The coal sorting device for coal-fired power equipment according to claim 1, characterized in that, The top of the sorting cylinder (22) is provided with a stirring motor (21), the power shaft of the stirring motor (21) is connected to the stirring rod (28), and the end of the stirring rod (28) is provided with a cleaning brush (281).

10. The coal sorting device for coal-fired power equipment according to claim 1, characterized in that, The surface of the fine material screen plate (231) is smoothly connected to the conical sidewall of the sorting cylinder (22), and the negative pressure fan (24) is located at the bottom of the air guide hood (23).

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