A coal cleaning device capable of realizing large capacity cleaning

Abstract

The application discloses a kind of to realize large capacity selection's injection coal coal preparation plant, it is related to injection coal coal preparation technology field;Including fixed unit, rotating unit, screening unit, three cooperation, collaborative operation, realize injection coal large capacity, high-precision classification washing and selection;Wherein fixed unit is the load-bearing foundation of integral device, for fixed, support rotating unit and screening unit, guarantee the stability of each transmission, screening structure operation;Rotating unit is as water flow disturbance and power switching core, through controllable rotation stirring water, realize raw coal uniform dispersion, and rely on ratchet structure realizes positive and negative direction power switching, matches different separation process requirement;Screening unit is the core of classification and separation, through centrifugal self-adaptive screening structure, adjustable control filter structure and lifting type separation tank, complete coal slime, gravel, coal powder step-by-step separation, realize raw coal fine selection.

Description

Technical Field

[0001] This invention relates to the field of pulverized coal preparation technology, specifically to a pulverized coal preparation device capable of large-capacity fine selection. Background Technology

[0002] Pulverized coal injection in blast furnaces is a core energy-saving and efficiency-enhancing technology in modern blast furnace ironmaking. With its advantages of effectively reducing coke ratio, compressing pig iron production costs, optimizing blast furnace smelting conditions, and improving overall smelting technical and economic indicators, it has been widely adopted in the steel industry. The blast furnace injection process places stringent technical requirements on the quality of the injected pulverized coal, ensuring low ash and sulfur content while maintaining high calorific value, excellent grindability, combustibility, and conveying performance, and meeting the standards for low explosiveness and high reactivity.

[0003] Currently, the sources of raw materials for pulverized coal injection in the industry have gradually diversified, expanding from traditional single anthracite to various coal types such as lean coal, semi-lean coal, non-caking coal, and long-flame coal. At the same time, the performance of raw materials is optimized through different coal type ratios to suit the different blast furnace smelting needs. However, all types of raw coal contain a large amount of impurities such as gravel and coal slime after mining. If unrefined raw coal is used directly, the quality of pulverized coal injection will be significantly reduced, affecting blast furnace smelting efficiency and finished product quality. Therefore, raw coal refining is an essential and crucial process before the use of pulverized coal injection.

[0004] Existing traditional pulverized coal preparation equipment has significant technical shortcomings in practical applications: First, most equipment has a single sorting mode, which can only achieve simple solid-liquid separation and cannot perform precise graded separation of coal powder, coal slime, and gravel in raw coal. Impurities are not thoroughly removed, and the purity of the selected pulverized coal is difficult to meet the standards. Second, traditional equipment has limited processing capacity and is mostly suitable for small-batch, fine sorting scenarios. It cannot meet the production needs of large-scale continuous industrial washing and is inefficient. Third, some water-washing coal preparation equipment has poor coordination between water flow agitation and screening structure, resulting in uneven dispersion of raw coal. This easily leads to problems such as coal powder sedimentation and coal slime carrying coal powder, causing raw material waste. In addition, the sorting stability is poor and the finished product qualification rate is low, making it difficult to adapt to the large-scale, high-quality pulverized coal supply needs of modern blast furnace ironmaking, thus restricting the industry's efficient and low-cost production development. Summary of the Invention

[0005] This invention addresses the shortcomings of existing traditional pulverized coal preparation equipment, which suffers from a single sorting mode, inability to achieve precise separation of coal powder, coal slime, and gravel, small washing capacity, low operating efficiency, and poor coordination between water flow agitation and screening structure leading to uneven raw coal sorting, raw material waste, and low purity and qualification rate of finished products. These shortcomings prevent the equipment from meeting the demands of large-scale, high-quality industrial pulverized coal washing and preparation in the modern steel industry. The invention provides a pulverized coal preparation device capable of large-capacity fine selection, effectively solving the problems existing in the prior art.

[0006] This invention is achieved through the following technical solution: A pulverized coal preparation device capable of large-capacity fine selection includes a fixed unit, a rotating unit, and a screening unit. The rotating unit includes a rotating funnel rotatably connected to the fixed unit. The screening unit includes a separation tank disposed inside the rotating funnel. A rotating shaft is rotatably connected to the middle of the separation tank, penetrating the separation tank. Paddles are fixedly connected to both the upper and lower ends of the rotating shaft, with the upper paddle located inside the separation tank and the lower paddle located inside the rotating funnel. Multiple sliding grooves are circumferentially fixedly connected to the middle of the rotating shaft, with sliding rods slidably connected within the grooves. A lever is fixedly connected to the outer end of each sliding rod. A rack is provided on the outer side of the lever. The rack is slidably connected to the bottom end of the separation groove and slides along the radial direction of the separation groove. A spring is fixedly connected between the outer end of the rack and the side wall of the separation groove. A gear shaft meshes on the rack. A third gear is fixedly connected to the upper end of the gear shaft. The third gear meshes on a first gear ring. The first gear ring is rotatably connected to the separation groove. Gear teeth are provided at both the lower and upper ends of the first gear ring. The lower end meshes with the third gear. Multiple fourth gears are circumferentially meshed at the upper end of the first gear ring. The fourth gears are fixedly connected to one end of a filter shaft. Multiple filter shafts are rotatably connected to the bottom of the separation groove. Multiple filter ports are provided at the bottom of the separation groove. Filter plates are provided on the filter ports and fixedly connected to the filter shafts.

[0007] Furthermore, the fixing unit includes a threaded rod, a fixed rod, and a fixed seat. Multiple threaded rods are threadedly connected around the separation groove. The threaded rods are rotatably connected to the fixed rod, and the fixed rod is fixedly connected to the fixed seat. The rotating funnel is rotatably connected inside the fixed seat.

[0008] Furthermore, the fixed rod extends into the rotating funnel, and the upper end of the threaded rod is fixedly connected to a fifth gear. All the fifth gears mesh together on the inner side of the second gear ring, which is rotatably connected to the fixed seat. The outer side of the second gear ring meshes with a sixth gear, which is fixedly connected to the output shaft of the second motor. The second motor is fixedly mounted on the fixed seat.

[0009] Furthermore, a first gear is provided on the outer side of the lower opening of the rotating funnel. The first gear meshes with a first ratchet. The first ratchet includes an outer wheel and an inner wheel. The outer wheel meshes with the first gear. A pawl is hinged to the inner side of the outer wheel. A ratchet tooth is provided on the outer side of the inner wheel. The pawl and the ratchet tooth mesh with each other. The inner wheel is fixedly connected to a drive shaft. A transmission belt is connected to the lower end of the drive shaft. The other end of the transmission belt is connected to the output shaft of a first motor. The first motor is fixedly mounted on a fixed unit.

[0010] Furthermore, a water-stop valve is provided below the lower opening of the rotating funnel. The water-stop valve includes two baffles, which are semi-circular. The baffles are fixedly connected to two hinge shafts, which are rotatably connected to a fixed unit. Gear teeth are provided at the same end of the two hinge shafts, and the gear teeth on the two hinge shafts mesh with each other.

[0011] Furthermore, a first bevel gear is fixedly connected to one of the hinge shafts. The first bevel gear meshes with a second bevel gear. The second bevel gear is rotatably connected to the fixed unit. A second gear is fixedly connected to the upper end of the second bevel gear. The second gear meshes with a second ratchet. The second ratchet has the same structure as the first ratchet, with the ratchet teeth and pawl facing opposite directions. The inner wheel of the second ratchet is fixedly connected to the drive shaft.

[0012] Furthermore, stirring ribs are provided on the inner wall of the rotating funnel.

[0013] The beneficial effects of this invention compared to the prior art are as follows: 1. Precise grading and sorting, high quality of finished product: This device can achieve step-by-step and differentiated separation of gravel, coal slime and coal powder in raw coal through the coordinated cooperation of water flow disturbance in the rotating unit and mechanical screening in the screening unit. It completely solves the problem of mixed separation and incomplete removal of impurities in traditional equipment, greatly improves the purity of pulverized coal products, and meets the stringent material standards for blast furnace injection.

[0014] 2. Large washing capacity and strong adaptability: The overall structure of this device is reasonable and the internal space is large. It overcomes the limitations of traditional equipment for small-batch sorting and can be adapted to large-scale and continuous industrial raw coal washing operations, which significantly improves the overall production efficiency.

[0015] 3. Strong structural linkage and high operational stability: This device relies on a linkage structure such as double ratchet forward and reverse steering power switching, centrifugal adaptive screening, and gear group synchronous transmission to realize the fully automated and coordinated operation of the mixing, screening, impurity removal, and unloading process. The various structures cooperate precisely and orderly, effectively avoiding the problems of raw coal sedimentation and coal powder entrainment and waste, and greatly improving the separation stability and finished product qualification rate.

[0016] 4. Easy to operate and highly practical: This device can complete all sorting processes through dual-motor coordinated control, with a high degree of automation. At the same time, it has a simple structure, low failure rate, and is easy to maintain and repair. It can be stably adapted to industrial-scale production scenarios for a long time, effectively reducing the production cost of pulverized coal beneficiation and improving the industry's production efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the fixed unit portion structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the rotating unit structure according to an embodiment of the present invention; Figure 3 This is an embodiment of the present invention. Figure 2 Enlarged structural diagram of A in the middle; Figure 4 This is a schematic diagram of the screening unit structure in an embodiment of the present invention; Figure 5 This is a schematic diagram of the first toothed ring structure according to an embodiment of the present invention. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0020] Please see Figures 1 to 5 This embodiment proposes a coal preparation device for pulverized coal injection that enables large-capacity fine selection. The device includes a fixed unit 1, a rotating unit 2, and a screening unit 3. These three units work precisely together to achieve large-capacity, high-precision grading and washing of pulverized coal. The fixed unit serves as the foundation of the entire device, fixing and supporting the rotating and screening units to ensure the stability of the transmission and screening structures. The rotating unit, as the core for water flow disturbance and power switching, achieves uniform dispersion of raw coal through controllable rotation and stirring of the water, and utilizes a ratchet structure to switch between forward and reverse power, matching the requirements of different separation processes. The screening unit, as the core for grading and separation, completes the step-by-step separation of coal slime, gravel, and coal powder through a centrifugal adaptive screening structure, an adjustable filtration structure, and a lifting separation tank, achieving fine selection of raw coal.

[0021] To ensure that the gravel, coal slime, and coal powder in the raw coal are fully distributed in the water, the water needs to be stirred to promote the full and uniform distribution of the coal powder. The rotating unit 2 includes a rotating funnel 21, which is rotatably connected to the fixed unit 1. The inner wall of the rotating funnel 21 is provided with stirring ribs. A first gear 211 is provided on the outer side of the lower opening of the rotating funnel 21. The first gear 211 meshes with a first ratchet 212. The first ratchet 212 includes an outer wheel and an inner wheel. The outer wheel meshes with the first gear 211. A pawl is hinged to the inner side of the outer wheel, and a ratchet tooth is provided on the outer side of the inner wheel. The pawl and the ratchet tooth mesh with each other. The inner wheel is fixedly connected to a drive shaft 213. The lower end of the drive shaft 213 is connected to a transmission belt. The other end of the transmission belt is connected to the output shaft of a first motor 214. The first motor 214 is fixedly installed on the fixed unit 1.

[0022] When the first motor 214 rotates forward, the pawl of the first ratchet 212 engages with the ratchet teeth, driving the rotating funnel 21 to rotate in the forward direction to stir the water; when the first motor 214 rotates in reverse, the first ratchet 212 idles, and the rotating funnel 21 stops running, realizing the controllable start and stop of the stirring process.

[0023] Because the release of water from the rotating funnel 21 needs to be controlled during use, a stop valve 22 is installed below the lower opening of the rotating funnel 21. The stop valve 22 includes two baffles 221, which are semi-circular. The baffles 221 are fixedly connected to two hinge shafts 222, which are rotatably connected to the fixed unit 1. Gear teeth are provided at the same end of the two hinge shafts 222, and the gear teeth on the two hinge shafts 222 mesh with each other. One of the hinge shafts 222... A first bevel gear 223 is fixedly connected to 22. The first bevel gear 223 meshes with a second bevel gear 224. The second bevel gear 224 is rotatably connected to the fixed unit 1. A second gear 225 is fixedly connected to the upper end of the second bevel gear 224. The second gear 225 meshes with a second ratchet 226. The second ratchet 226 has the same structure as the first ratchet 212, except that the ratchet teeth and pawl face opposite directions. The inner wheel of the second ratchet 226 is fixedly connected to the drive shaft 213.

[0024] Because the rotating funnel 21 agitates the water within it during rotation, it needs to remain in the funnel. When the funnel stops rotating, the stop valve 22 controls the release of water. Therefore, when the funnel 21 rotates, the drive shaft 213 cannot drive the second gear 225 to rotate under the action of the second ratchet 226, and the baffle 221 remains closed. The first motor 214 reverses, driving the drive shaft 213 to reverse as well. The first ratchet 212 stops transmitting power, the rotating funnel 21 stops rotating, and the drive shaft 213 transmits power to the second ratchet 226. The second ratchet 226 drives the second gear 225 and the second bevel gear 224 to rotate. The second bevel gear 224 drives the first bevel gear 223 to rotate, and the first bevel gear 223 drives the two hinge shafts 222 to rotate, opening the baffle 221 and allowing water to flow out of the rotating funnel 21.

[0025] After the rotating unit 2 fully disperses the raw coal in the water, the screening unit 3 is needed to separate the various parts of the raw coal. The screening unit 3 includes a separation tank 311, with a rotating shaft 312 rotatably connected in the middle of the separation tank 311. The rotating shaft 312 passes through the separation tank 311, and paddles 313 are fixedly connected to both the upper and lower ends of the rotating shaft 312. Multiple sliding grooves 314 are circumferentially fixedly connected to the middle of the rotating shaft 312, and sliding rods 315 are slidably connected within the sliding grooves 314. A lever 316 is fixedly connected to the outer end of the sliding rod 315. When the rotating shaft 312 rotates, the sliding rods 315 and the lever 316 slide outward under the action of centrifugal force. A rack 317 is provided on the outer side of the lever 316. The rack 317 is slidably connected to the bottom end of the separation tank 311 and can slide along the radial direction of the separation tank 311. A spring is fixedly connected between the outer end of the rack 317 and the side wall of the separation tank 311. A gear shaft 318 meshes with the rack 317. A third gear 319 is fixedly connected to the upper end of the gear shaft 318. The third gear 319 meshes with a first gear ring 320. The first gear ring 320 is rotatably connected to the separation groove 311. Gear teeth are provided at both the lower and upper ends of the first gear ring 320. The lower end meshes with the third gear 319. Multiple fourth gears 321 are circumferentially meshed at the upper end of the first gear ring 320. The fourth gears 321 are fixedly connected to one end of a filter shaft 322. The multiple filter shafts 322 are rotatably connected to the bottom of the separation groove 311. Multiple filter ports are provided at the bottom of the separation groove 311. Filter plates 323 are provided on each filter port and are fixedly connected to the filter shafts 322. The filter plates 323 can control whether the filter ports are open or closed.

[0026] Raw coal is placed in the separation tank 311. Both the rotating funnel 21 and the separation tank 311 are filled with water. Gravel and coal slime in the raw coal sink to the bottom of the water and reach the bottom of the separation tank 311. The rotating funnel 21 rotates to agitate the water. The rotation of the water in the rotating funnel 21 drives the rotating shaft 312 to rotate through the paddle 313. The paddle 313 at the upper end of the rotating shaft 312 agitates the water in the separation tank 311, causing the coal powder to suspend in the water. As the rotating shaft 312 rotates, the sliding rod 315 inside the sliding groove 314 of the rotating shaft 312 slides outward under the action of centrifugal force. This pushes the rack 317 to one end outward via the lever 316. The movement of the rack 317 causes the gear shaft 318 to rotate. The third gear 319 drives the first gear ring 320 to rotate, which in turn drives the fourth gear 321 to rotate, causing the filter shaft 322 to rotate and opening the filter plate 323. Because the water flow rotates at this time, it also causes the coal sludge at the bottom to rotate simultaneously. During this rotation, the coal sludge enters the filter opening and falls into the rotating funnel 21 below. Larger gravel cannot pass through the filter opening and remains in the separation tank 311.

[0027] The separation groove 311 is threadedly connected to the fixing unit 1.

[0028] After the coal slime is separated, the gravel and coal powder in the separation tank 311 need to be separated, and the filtered gravel can be cleaned at the same time. The separation tank 311 is threadedly connected to the fixing unit 1. The fixing unit 1 includes a threaded rod 111, a fixing rod 112, a fixing seat 113, a fifth gear 114, a second gear ring 115, a sixth gear 116, and a second motor 117. The separation groove 311 is threaded with multiple threaded rods 111 around its perimeter. Each threaded rod 111 is rotatably connected to a fixed rod 112, which is fixedly connected to a fixed base 113. A rotating funnel 21 is rotatably connected within the fixed base 113. The fixed rods 112 extend into the rotating funnel 21. The separation groove 311 is located inside the rotating funnel 21, with the upper paddle plate 313 located within the separation groove 311 and the lower paddle plate 313 located within the rotating funnel 21. A fifth gear 114 is fixedly connected to the upper end of each threaded rod 111. All fifth gears 114 mesh with the inner side of a second gear ring 115, which is rotatably connected to the fixed base 113. A sixth gear 116 meshes with the outer side of the second gear ring 115. The sixth gear 116 is fixedly connected to the output shaft of a second motor 117, which is fixedly mounted on the fixed base 113.

[0029] For the separation of gravel and coal dust, the rotating funnel 21 agitates the water, opening the filter port in the separation tank 311. The second motor 117 starts, driving the sixth gear 116 to rotate. The sixth gear 116 drives the second gear ring 115 to rotate, which in turn causes the fifth gear 114 and the threaded rod 111 to rotate. The rotation of the threaded rod 111 moves the separation tank 311 upwards. During this upward movement, water carrying coal dust flows from the filter port into the rotating funnel 21, while the gravel remains in the separation tank 311, thus achieving the separation of coal dust and gravel.

[0030] The separation steps of this device are as follows: Raw coal is placed into the separation tank 311. Both the rotating funnel 21 and the separation tank 311 are filled with water. Gravel and coal slime in the raw coal sink to the bottom of the water and reach the bottom of the separation tank 311. The first motor 214 starts, driving the drive shaft 213 to rotate via the transmission belt. The drive shaft 213 drives the ratchet to rotate, which in turn drives the first gear 211 and the rotating funnel 21 to rotate, agitating the water in the rotating funnel 21. The rotation of the rotating funnel 21 agitates the water, and the rotation of the water in the rotating funnel 21 drives the rotating shaft 312 to rotate via the paddle 313. The paddle 313 at the upper end of the rotating shaft 312 agitates the water in the separation tank 311, causing the coal powder to suspend in the water. As the rotating shaft 312 rotates, the sliding rod 315 inside the sliding groove 314 of the rotating shaft 312 slides outward under the action of centrifugal force. This pushes the rack 317 to one end outward via the lever 316. The movement of the rack 317 causes the gear shaft 318 to rotate. The third gear 319 drives the first gear ring 320 to rotate, which in turn drives the fourth gear 321 to rotate, causing the filter shaft 322 to rotate and opening the filter plate 323. Because the water flow rotates at this time, it also causes the coal sludge at the bottom to rotate simultaneously. During this rotation, the coal sludge enters the filter opening and falls into the rotating funnel 21 below. Larger gravel cannot pass through the filter opening and remains in the separation tank 311.

[0031] The coal slime filtered into the rotating funnel 21 accumulates at the lower end of the funnel 21. The first motor 214 reverses, driving the drive shaft 213 to reverse as well. The first ratchet 212 stops driving, and the rotating funnel 21 stops rotating. At the same time, the filter plate 323 closes the filter opening. The drive shaft 213 transmits power to the second ratchet 226, which drives the second gear 225 and the second bevel gear 224 to rotate. The second bevel gear 224 drives the first bevel gear 223 to rotate, and the first bevel gear 223 drives the two hinge shafts 222 to rotate, opening the baffle 221. Water flows out of the rotating funnel 21, carrying the coal slime out of the device.

[0032] Then, the first motor 214 drives the rotating funnel 21 to rotate again, while the second motor 117 starts, driving the sixth gear 116 to rotate. The sixth gear 116 drives the second gear ring 115 to rotate, and the rotation of the second gear ring 115 causes the fifth gear 114 and the threaded rod 111 to rotate. The rotation of the threaded rod 111 moves the separation tank 311 upward. During the upward movement of the separation tank 311, water carrying coal dust flows into the rotating funnel 21 from the filter port, while gravel remains in the separation tank 311, thus achieving the separation of coal dust and gravel. At this time, the water remaining in the rotating funnel 21 is coal dust that does not contain gravel and coal slime.

[0033] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this disclosure. Those skilled in the art should understand that this disclosure is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this disclosure. Various changes and modifications can be made to this disclosure without departing from its spirit and scope, and all such changes and modifications fall within the scope of this disclosure as claimed.

Claims

1. A pulverized coal preparation device capable of large-capacity fine coal selection, characterized in that, The system includes a fixed unit (1), a rotating unit (2), and a screening unit (3). The rotating unit (2) includes a rotating funnel (21), which is rotatably connected to the fixed unit (1). The screening unit (3) includes a separation groove (311), which is located inside the rotating funnel (21). A rotating shaft (312) is rotatably connected in the middle of the separation groove (311). The rotating shaft (312) passes through the separation groove (311). Paddles (313) are fixedly connected to both the upper and lower ends of the rotating shaft (312). The upper paddle (313) is located inside the separation groove (311), and the lower paddle (313) is located in the rotating funnel (21). Multiple sliding grooves (314) are fixedly connected circumferentially in the middle of the rotating shaft (312). A sliding rod (315) is slidably connected in the sliding groove (314), and a lever (316) is fixedly connected to the outer end of the sliding rod (315). A rack (317) is provided on the outer side of the lever (316). The rack (317) is slidably connected to the bottom end of the separation groove (311). The rack (317) slides along the radial direction of the separation groove (311). A spring is fixedly connected between the outer end of the rack (317) and the side wall of the separation groove (311). A gear shaft (318) meshes on the rack (317). A third gear (319) is fixedly connected to the upper end of the gear shaft (318). The third gear (319) meshes on a first gear ring (320). The first gear ring (320) rotates... The first gear ring (320) is connected to the separation tank (311). Both the lower and upper ends of the first gear ring (320) are provided with gear teeth. The lower end meshes with the third gear (319). The upper end of the first gear ring (320) is circumferentially meshed with multiple fourth gears (321). The fourth gears (321) are fixedly connected to one end of the filter shaft (322). Multiple filter shafts (322) are rotatably connected to the bottom of the separation tank (311). Multiple filter ports are provided at the bottom of the separation tank (311). Filter plates (323) are provided on the filter ports. The filter plates (323) are fixedly connected to the filter shafts (322).

2. The pulverized coal preparation device capable of large-capacity fine coal selection according to claim 1, characterized in that, The fixing unit (1) includes a threaded rod (111), a fixing rod (112), and a fixing seat (113). Multiple threaded rods (111) are threaded around the separation groove (311). The threaded rods (111) are rotatably connected to the fixing rod (112). The fixing rod (112) is fixedly connected to the fixing seat (113). The rotating funnel (21) is rotatably connected inside the fixing seat (113).

3. The pulverized coal preparation device capable of large-capacity fine coal selection according to claim 2, characterized in that, The fixed rod (112) extends into the rotating funnel (21). The upper end of the threaded rod (111) is fixedly connected to the fifth gear (114). All the fifth gears (114) mesh together on the inner side of the second gear ring (115). The second gear ring (115) is rotatably connected to the fixed seat (113). The outer side of the second gear ring (115) meshes with the sixth gear (116). The sixth gear (116) is fixedly connected to the output shaft of the second motor (117). The second motor (117) is fixedly mounted on the fixed seat (113).

4. The pulverized coal preparation device capable of large-capacity fine coal selection according to claim 1, characterized in that, A first gear (211) is provided on the outer side of the lower opening of the rotating funnel (21). The first gear (211) meshes with a first ratchet (212). The first ratchet (212) includes an outer wheel and an inner wheel. The outer wheel meshes with the first gear (211). A pawl is hinged to the inner side of the outer wheel. A ratchet tooth is provided on the outer side of the inner wheel. The pawl and the ratchet tooth mesh with each other. The inner wheel is fixedly connected to the drive shaft (213). A transmission belt is connected to the lower end of the drive shaft (213). The other end of the transmission belt is connected to the output shaft of the first motor (214). The first motor (214) is fixedly installed on the fixed unit (1).

5. A pulverized coal preparation device capable of large-capacity fine coal selection according to claim 4, characterized in that, A stop valve (22) is provided below the lower opening of the rotating funnel (21). The stop valve (22) includes two baffles (221). The two baffles (221) are semi-circular. The baffles (221) are fixedly connected to two hinge shafts (222). The hinge shafts (222) are rotatably connected to the fixed unit (1). Gear teeth are provided at the same end of the two hinge shafts (222). The gear teeth on the two hinge shafts (222) mesh with each other.

6. A pulverized coal preparation device capable of large-capacity fine coal selection according to claim 5, characterized in that, A first bevel gear (223) is fixedly connected to one of the hinge shafts (222). The first bevel gear (223) meshes with a second bevel gear (224). The second bevel gear (224) is rotatably connected to the fixed unit (1). A second gear (225) is fixedly connected to the upper end of the second bevel gear (224). The second gear (225) meshes with a second ratchet (226). The second ratchet (226) has the same structure as the first ratchet (212). The ratchet teeth and pawl face opposite directions. The inner wheel of the second ratchet (226) is fixedly connected to the drive shaft (213).

7. A pulverized coal preparation device capable of large-capacity fine coal selection according to claim 1, characterized in that, The inner wall of the rotating funnel (21) is provided with stirring ribs.

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