A method and device for washing and coking fine coal using inferior coal

Abstract

The present invention relates to the technical field of clean coal recovery, and specifically relates to a device for washing and selecting coking clean coal from low-quality coal, including a washing and selecting frame, a feeding hopper, a liquid inlet pipe, and a collection pipe. The feeding hopper is arranged on the left side of the top of the washing and selecting frame, and the liquid inlet pipe and the collection pipe are respectively arranged on both sides of the washing and selecting frame. When the low-quality coal is flotated in the present invention, the clean coal in the low-quality coal floats to the upper layer of the suspension under the action of buoyancy, and the lower side of the scraping plate is used to quickly collect the upper-layer clean coal inside the washing and selecting frame, significantly improving the collection efficiency of the upper-layer flotation clean coal; when the low-quality coal enters the second sedimentation tank for clean coal flotation, by sending the suspension out of the air-blowing box, the mixture of coal slime and clean coal below the second sedimentation tank is dispersed, enabling the clean coal in the coal slime to float to the upper layer and be collected, further improving the collection efficiency of the clean coal in the low-quality coal, and at the same time reducing the waste of clean coal resources in the low-quality coal.

Description

Technical Field

[0001] The present invention relates to the technical field of clean coal recovery, and specifically to a method and device for washing and selecting coking clean coal from inferior coal. Background Art

[0002] Coal is the most important solid fuel and a type of combustible organic rock. It is formed by lush plants growing in a certain geological era, gradually accumulating into thick layers in a suitable geological environment, and being buried underwater or in sediment, and undergoing natural coalification over a long geological era. The raw coal mined from coal mines needs to be subjected to flotation treatment to obtain clean coal. The main coal washing processes in China's coal industry are jigging flotation, heavy medium flotation, and jigging heavy medium flotation. The main disadvantages of these three types of processes are that the production links are relatively simplified, mostly using mixed feeding, and the particles entering, due to different thicknesses, will interfere with each other during operation.

[0003] In the prior art, the devices used for washing and selecting coking clean coal from inferior coal have high costs, complex management and operation, and cannot efficiently collect the clean coal during flotation, resulting in a large amount of clean coal in the inferior coal sinking to the bottom, poor washing effect of the inferior coal, and low yield of coking clean coal.

[0004] Therefore, we have proposed a device for washing and selecting coking clean coal from inferior coal, and also disclosed the working method of this device. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a method and device for washing and selecting coking clean coal from inferior coal, which is used to quickly collect the clean coal during the flotation process, improve the yield of coking clean coal, and the washing effect of the inferior coal.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A device for washing and selecting coking clean coal from inferior coal includes a washing and selecting frame, a feeding hopper, a liquid inlet pipe, and a collecting pipe. The feeding hopper is arranged on the left side of the top of the washing and selecting frame, and the liquid inlet pipe and the collecting pipe are respectively arranged on both sides of the washing and selecting frame. A partition is arranged inside the washing and selecting frame. The partition divides the two sides inside the washing and selecting frame into a first sedimentation tank and a second sedimentation tank, and sedimentation frames are arranged at the bottoms of both the first sedimentation tank and the second sedimentation tank. A material turning component is arranged inside each of the two sedimentation frames. A scraping mechanism is arranged on the top of the washing and selecting frame;

[0007] The scraping mechanism includes a scraping frame. The scraping frame is arranged on the top of the washing and selecting frame, and a conveyor belt is rotatably arranged at the bottom of the scraping frame. A number of conveyor rollers are arranged inside the conveyor belt, and the surface of the conveyor rollers is in meshing transmission with the inner surface of the conveyor belt. A number of scraping plates are arranged on the surface of the conveyor belt;

[0008] The scraping plate is composed of a fixed plate and a movable plate. One side of the fixed plate is connected to the surface of the conveyor belt, and a movable plate is rotatably arranged on one side of the fixed plate. Grooves are formed on both sides of the movable plate, and rotating shafts are arranged inside the two grooves. One end of each of the two rotating shafts is connected to the inner wall of the fixed plate, and limiting torsion springs are sleeved on the surfaces of the two rotating shafts.

[0009] Preferably, leveling rollers are rotatably arranged inside both the first sedimentation tank and the second sedimentation tank, and the rear ends of the two leveling rollers are driven by motors.

[0010] Preferably, two scraping motors are arranged on the top of the scraping frame, and first belt pulleys are arranged at both ends of the output shafts of the two scraping motors and one of the conveying rollers. The surfaces of the two first belt pulleys are connected by belt transmission.

[0011] Preferably, an air-blowing mechanism is further arranged on one side inside the second sedimentation tank. The air-blowing mechanism includes an air-blowing box, the air-blowing box is arranged at the bottom of the inner wall of the second sedimentation tank, and a filter plate is arranged below one side of the air-blowing box.

[0012] Preferably, a piston frame is slidably arranged inside the air-blowing box, and a sealing strip is arranged on the peripheral surface of the piston frame.

[0013] Preferably, screws are arranged on both sides of the top of the piston frame, driving rods are rotatably arranged on both sides of the top of the air-blowing box, the bottom ends of the two driving rods are respectively threadedly connected to the top ends of the two screws, an air-blowing motor is arranged on the top inner wall of the air-blowing box, and one end of the output shaft of the air-blowing motor extends to the top of the air-blowing box. Second belt pulleys are arranged at the top ends of the output shaft of the air-blowing motor and the two driving rods, and the surfaces of the three second belt pulleys are connected by belt transmission.

[0014] Preferably, a top plate is further arranged on the top of the air-blowing box.

[0015] Preferably, the material-turning assembly includes a material-turning roller and a material-turning sieve plate. The material-turning roller is rotatably arranged inside the sedimentation frame, and a plurality of material-turning sieve plates are arranged on the surface of the material-turning roller at equal angles. A material-turning motor is arranged on the front of the sedimentation frame, and the output shaft of the material-turning motor is connected to one end of the material-turning roller.

[0016] Preferably, a discharge hopper is arranged at the bottom of the sedimentation frame, and the inside of the discharge hopper is communicated with the inside of the sedimentation frame.

[0017] A method for washing and beneficiating coking clean coal with inferior coal is as follows:

[0018] Step 1: Feed the inferior coal into the interior of the washing rack through a feeding hopper, and introduce suspension into the interior of the washing rack through a liquid inlet pipe. At the same time, make two material leveling rollers rotate in opposite directions inside the first sedimentation tank and the second sedimentation tank respectively;

[0019] Step 2: After the inferior coal enters the interior of the first sedimentation tank, drive the scraper plate to rotate through a conveyor belt. The lower side of the scraper plate quickly collects the upper-layer clean coal inside the washing rack, and makes the clean coal in the upper-layer flotation enter the interior of the collection pipe for quick collection;

[0020] Step 3: When washing the inferior coal inside the second sedimentation tank, drive two driving rods to rotate synchronously in the same direction inside the air-blowing box by the output shaft of the air-blowing motor. During the rotation of the two driving rods, the two driving rods move downward. When the piston frame descends to the lower part inside the air-blowing box, control the output shaft of the air-blowing motor to rotate in the reverse direction, change the rotation direction of the two driving rods, and then make the two screw rods drive the piston frame to move upward, so that the piston frame moves up and down inside the air-blowing box, causing the suspension inside the second sedimentation tank to continuously gush out from the interior of the air-blowing box, separating the slime and the clean coal, and making the clean coal in the slime float to the upper layer of the suspension to be collected;

[0021] Step 4: When washing and coking clean coal from the inferior coal inside the first sedimentation tank and the second sedimentation tank, drive the turning roller to rotate inside the sedimentation frame by the output end of the turning motor. The turning sieve plate on the surface of the turning roller rotates inside the sedimentation frame, turning the slime accumulated in the sedimentation frame, making the clean coal mixed in the slime float under the action of buoyancy, and finally collecting and processing the gangue and slime inside the sedimentation frame through a discharge hopper.

[0022] The present invention provides a method and device for washing and coking clean coal using inferior coal. Compared with the prior art, it has the following beneficial effects:

[0023] By arranging a scraping mechanism at the top of the washing rack, when the inferior coal is flotated inside the washing rack, the clean coal in the inferior coal floats to the upper layer of the suspension under the action of buoyancy. The conveyor belt in the scraping mechanism drives the scraping plate to rotate, and the lower side of the scraping plate quickly collects the upper-layer clean coal inside the washing rack, enabling the clean coal in the upper-layer flotation to enter the inside of the collection pipe for rapid collection, significantly improving the collection efficiency of the upper-layer flotation clean coal. When performing heavy-medium flotation clean coal of the inferior coal inside the washing rack, in cooperation with the air-blowing mechanism arranged on one side inside the washing rack, when the inferior coal enters the second settling tank for clean coal flotation, by controlling the piston rack inside the air-blowing tank to reciprocate up and down, the suspension inside the second settling tank is pumped into the inside of the air-blowing tank and then sent out from the inside of the air-blowing tank, thereby dispersing the mixture of slime and clean coal below the second settling tank, allowing the clean coal in the slime to float to the upper layer and be collected, further improving the collection efficiency of the clean coal in the inferior coal and reducing the waste of clean coal resources in the inferior coal.

[0024] By arranging sedimentation frames at the bottoms of the first settling tank and the second settling tank, and simultaneously arranging turning components inside the two sedimentation frames, when washing the coking clean coal in the inferior coal, the output end of the turning motor drives the turning roller to rotate inside the sedimentation frame, and the turning sieve plate on the surface of the turning roller rotates inside the sedimentation frame to turn the slime accumulated in the sedimentation frame, enabling the clean coal mixed in the slime to float under the action of buoyancy, avoiding the slime from piling up on the clean coal and causing waste of the clean coal. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of a device for washing coking clean coal using inferior coal according to an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the washing rack, scraping mechanism and sedimentation frame according to an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the internal structure of the washing rack according to an embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the sedimentation frame according to an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of the structure of the scraping rack and conveyor belt according to an embodiment of the present invention;

[0030] Figure 6 It is a schematic diagram of the structure of the conveyor belt and conveyor roller according to an embodiment of the present invention;

[0031] Figure 7 It is a schematic diagram of the structure of the scraping plate according to an embodiment of the present invention;

[0032] Figure 8This is a schematic diagram of the internal structure of the air-blowing box in the embodiment of the present invention.

[0033] In the figure, 10 is a coal washing rack; 20 is a feeding hopper; 30 is a liquid inlet pipe; 40 is a collection pipe; 50 is a partition; 60 is a sedimentation frame; 70 is a scraping mechanism; 80 is a material leveling roller; 90 is an air-blowing mechanism; 11 is a material turning roller; 12 is a material turning sieve plate; 13 is a material turning motor; 14 is a discharge hopper; 21 is a scraping rack; 22 is a conveyor belt; 23 is a conveying roller; 24 is a scraping motor; 25 is a first pulley; 26 is a scraping plate; 261 is a fixing plate; 262 is a movable plate; 263 is a groove; 264 is a rotating shaft; 265 is a limiting torsion spring; 31 is an air-blowing box; 32 is a filter plate; 33 is a piston frame; 34 is a sealing strip; 35 is a screw; 36 is a driving rod; 37 is an air-blowing motor; 38 is a second pulley; 39 is a top plate. Detailed implementation mode

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0035] Embodiment 1

[0036] Please refer to Figures 1 to 8 As shown in the figure, a device for washing and coking clean coal using low-quality coal includes a coal washing rack 10, a feeding hopper 20, a liquid inlet pipe 30 and a collection pipe 40. The feeding hopper 20 is arranged on the left side of the top of the coal washing rack 10, and the liquid inlet pipe 30 and the collection pipe 40 are respectively arranged on both sides of the coal washing rack 10. A partition 50 is arranged inside the coal washing rack 10. The partition 50 divides the two sides inside the coal washing rack 10 into a first sedimentation tank and a second sedimentation tank, and sedimentation frames 60 are arranged at the bottoms of both the first sedimentation tank and the second sedimentation tank. Turning components are arranged inside both sedimentation frames 60, and a scraping mechanism 70 is arranged on the top of the coal washing rack 10;

[0037] Material leveling rollers 80 are rotatably arranged inside both the first sedimentation tank and the second sedimentation tank, and the rear ends of both material leveling rollers 80 are driven by motors. By arranging the material leveling rollers 80 inside the first sedimentation tank and the second sedimentation tank, the low-quality coal is fully dispersed during the sedimentation process, so that the clean coal in the low-quality coal can float and be collected to the greatest extent, reducing the waste of clean coal.

[0038] The material turning assembly includes a material turning roller 11 and a material turning sieve plate 12. The material turning roller 11 is rotatably arranged inside the sedimentation frame 60, and a number of material turning sieve plates 12 are equiangularly distributed on the surface of the material turning roller 11. A material turning motor 13 is arranged on the front of the sedimentation frame 60, and the output shaft of the material turning motor 13 is connected to one end of the material turning roller 11. The output end of the material turning motor 13 is used to drive the material turning roller 11 to rotate inside the sedimentation frame 60. The material turning sieve plates 12 on the surface of the material turning roller 11 rotate inside the sedimentation frame 60 to turn the slime accumulated in the sedimentation frame 60, so that the clean coal mixed in the slime floats under the action of buoyancy, avoiding the accumulation of slime on the clean coal and causing waste of clean coal. A discharge hopper 14 is arranged at the bottom of the sedimentation frame 60, and the inside of the discharge hopper 14 is communicated with the inside of the sedimentation frame 60. The discharge hopper 14 is used to collect and process the slime inside the sedimentation frame 60.

[0039] The scraping mechanism 70 includes a scraping frame 21. The scraping frame 21 is arranged on the top of the washing frame 10, and a conveyor belt 22 is rotatably arranged at the bottom of the scraping frame 21. A number of conveyor rollers 23 are arranged inside the conveyor belt 22, and the surface of the conveyor roller 23 is meshed and driven with the inner surface of the conveyor belt 22. Two scraping motors 24 are arranged on the top of the scraping frame 21, and the output ends of the two scraping motors 24 and both ends of one of the conveyor rollers 23 are provided with first belt pulleys 25. The surfaces of the two first belt pulleys 25 are connected by belt drive. By the operation of the two scraping motors 24, one of the conveyor rollers 23 is driven to rotate, so as to realize the rotation of the conveyor belt 22 at the bottom of the scraping frame 21. A number of scraping plates 26 are arranged on the surface of the conveyor belt 22. The scraping plate 26 is composed of a fixed plate 261 and a movable plate 262. One side of the fixed plate 261 is connected to the surface of the conveyor belt 22, and a movable plate 262 is also rotatably arranged on one side of the fixed plate 261. Grooves 263 are opened on both sides of the movable plate 262, and rotating shafts 264 are arranged inside the two grooves 263. One end of each of the two rotating shafts 264 is connected to the inner wall of the fixed plate 261, and limiting torsion springs 265 are sleeved on the surfaces of the two rotating shafts 264. By means of the limiting torsion springs 265 arranged on the surfaces of the rotating shafts 264, the movable plate 262 can rotate at a certain angle on one side of the fixed plate 261. In the natural state, the movable plate 262 and the fixed plate 261 are in a horizontal state. When the fixed plate 261 moves to the upper side driven by the conveyor belt 22, one side of the movable plate 262 contacts the inner wall of the scraping frame 21. At this time, one side of the movable plate 262 receives a thrust, so that one side of the movable plate 262 rotates on one side of the fixed plate 261, and then the scraping plate 26 can stably rotate on the surface of the conveyor belt 22. When the conveyor belt 22 drives the scraping plate 26 to rotate, the lower side of the scraping plate 26 quickly collects the upper-layer clean coal inside the washing frame 10, so that the clean coal in the upper-layer flotation enters the inside of the collection pipe 40 for quick collection, significantly improving the collection efficiency of the upper-layer flotation clean coal.

[0040] Example 2

[0041] As a further supplementary solution to the above embodiments of the present invention, a gas injection mechanism 90 is further provided on one side inside the second sedimentation tank. The gas injection mechanism 90 includes a gas injection box 31. The gas injection box 31 is arranged at the bottom of the inner wall of the second sedimentation tank, and a filter plate 32 is arranged below one side of the gas injection box 31. A number of filter holes are arranged inside the filter plate 32, and the gas injection box 31 is communicated with the inside of the second sedimentation tank through the filter holes;

[0042] A piston frame 33 is slidably arranged inside the gas injection box 31, and a sealing strip 34 is arranged on the peripheral surface of the piston frame 33. The surface of the sealing strip 34 is in sliding contact with the inner wall surface of the gas injection box 31. The sealing strip 34 on the peripheral surface of the piston frame 33 is used to ensure the sealing between the piston frame 33 and the gas injection box 31. When controlling the piston frame 33 to slide up and down inside the gas injection box 31, the piston frame 33 sends the air below the gas injection box 31 to the outside through the filter plate 32. Then the piston frame 33 slides upward, sucking the suspension inside the second sedimentation tank into the gas injection box 31. At the same time, the filter plate 32 is used to block the large-volume particulate matters in the suspension to prevent the large-volume particulate matters from entering the gas injection box 31 and damaging the inner wall of the gas injection box 31, thereby affecting the connection sealing between the piston frame 33 and the gas injection box 31.

[0043] Screws 35 are arranged on both sides of the top of the piston frame 33. Driving rods 36 are rotatably arranged on both sides of the top of the gas injection box 31. The bottom ends of the two driving rods 36 are respectively threadedly connected to the top ends of the two screws 35. A gas injection motor 37 is arranged on the top of the inner wall of the gas injection box 31, and one end of the output shaft of the gas injection motor 37 extends to the top of the gas injection box 31. Second belt pulleys 38 are arranged at the top ends of the output shaft of the gas injection motor 37 and the two driving rods 36, and the surfaces of the three second belt pulleys 38 are connected by belt transmission. The output shaft of the gas injection motor 37 is used to drive the two driving rods 36 to rotate synchronously in the same direction inside the gas injection box 31. During the rotation of the two driving rods 36, the screws 35 threadedly connected to their bottom ends will move downward along the two driving rods 36 due to the rotational limit of the piston frame 33. Thus, the downward movement of the piston frame 33 inside the gas injection box 31 is realized. When the piston frame 33 descends to the lower part inside the gas injection box 31, the output shaft of the gas injection motor 37 is controlled to rotate in the reverse direction, changing the rotation direction of the two driving rods 36, so that the two screws 35 drive the piston frame 33 to move upward, realizing the flexible driving of the piston frame 33 to move up and down inside the gas injection box 31.

[0044] The top of the air inflation box 31 is also provided with a top plate 39, which is used to seal the top of the air inflation box 31 to prevent the suspension from rusting the second pulley 38 and the belt.

[0045] Embodiment 3

[0046] Please refer to Figures 1 to 8 As shown in the figure, a method for washing and coking fine coal with low-quality coal is as follows:

[0047] Step 1: Feed the low-quality coal into the inside of the washing rack 10 through the feeding hopper 20, and introduce the suspension into the inside of the washing rack 10 through the liquid inlet pipe 30. At the same time, start the driving motors of the material leveling rollers 80 inside the first settling tank and the second settling tank, and let the two material leveling rollers 80 rotate in the first settling tank and the second settling tank respectively in opposite directions, so that the low-quality coal is fully dispersed during the settling process.

[0048] Step 2: After the low-quality coal enters the inside of the first settling tank, the gangue in the low-quality coal falls to the lower part inside the first settling tank. In the second settling tank, the high-density substances of the low-quality coal sink, while the coking fine coal floats on the upper layer of the suspension due to its low density. At this time, by the operation of the two scraping motors 24, one of the conveyor rollers 23 is driven to rotate, so as to realize the rotation of the conveyor belt 22 at the bottom of the scraping rack 21. In the natural state, the movable plate 262 and the fixed plate 261 are in a horizontal state. When the fixed plate 261 moves to the upper side driven by the conveyor belt 22, one side of the movable plate 262 contacts the inner wall of the scraping rack 21. At this time, one side of the movable plate 262 receives a thrust force, so that one side of the movable plate 262 rotates on one side of the fixed plate 261, and then the scraping plate 26 can stably rotate on the surface of the conveyor belt 22. When the conveyor belt 22 drives the scraping plate 26 to rotate, the lower side of the scraping plate 26 quickly collects the upper-layer fine coal inside the washing rack 10, so that the fine coal in the upper-layer flotation enters the inside of the collecting pipe 40 for quick collection.

[0049] Step 3: When washing inferior coal inside the second settling tank, the output shaft of the air-blowing motor 37 drives two driving rods 36 to rotate synchronously in the same direction inside the air-blowing box 31. During the rotation of the two driving rods 36, the screw rods 35 threadedly connected to their bottom ends are rotationally limited by the piston frame 33. Therefore, the two screw rods 35 will move downward along the two driving rods 36 during the rotation of the two driving rods 36, thereby realizing the downward movement of the piston frame 33 inside the air-blowing box 31. When the piston frame 33 descends to the lower part inside the air-blowing box 31, control the output shaft of the air-blowing motor 37 to rotate in the reverse direction, change the rotation direction of the two driving rods 36, and then let the two screw rods 35 drive the piston frame 33 to move upward, so that the piston frame 33 moves up and down inside the air-blowing box 31, thereby continuously causing the suspension inside the second settling tank to gush out from inside the air-blowing box 31, separating the slime and clean coal, and allowing the clean coal in the slime to float to the upper layer of the suspension and be collected;

[0050] Step 4: When washing and coking clean coal from inferior coal inside the first and second settling tanks, the output end of the turning motor 13 drives the turning roller 11 to rotate inside the sedimentation frame 60. The turning sieve plate 12 on the surface of the turning roller 11 rotates inside the sedimentation frame 60 to turn the slime accumulated in the sedimentation frame 60, allowing the clean coal mixed in the slime to float under the action of buoyancy. Finally, the discharge hopper 14 is used to collect and process the gangue and slime inside the sedimentation frame 60.

[0051] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0052] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0053] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for washing and beneficiating coking clean coal using inferior coal, comprising a washing and beneficiating rack (10), a feeding hopper (20), a liquid inlet pipe (30) and a collecting pipe (40). The feeding hopper (20) is arranged on the left side of the top of the washing and beneficiating rack (10), and the liquid inlet pipe (30) and the collecting pipe (40) are respectively arranged on both sides of the washing and beneficiating rack (10). It is characterized in that: Inside the washing and screening rack (10), a partition plate (50) is provided. The partition plate (50) divides the two sides inside the washing and screening rack (10) into a first settling tank and a second settling tank. Sedimentation frames (60) are provided at the bottoms of both the first settling tank and the second settling tank. Inside both of the sedimentation frames (60), a material turning assembly is provided. A scraping mechanism (70) is provided at the top of the washing and screening rack (10). The scraping mechanism (70) includes a scraping rack (21). The scraping rack (21) is provided at the top of the washing and screening rack (10). A conveyor belt (22) is rotatably provided at the bottom of the scraping rack (21). Inside the conveyor belt (22), a number of conveyor rollers (23) are provided. The surface of the conveyor roller (23) is meshed and driven with the inner surface of the conveyor belt (22). At the top of the scraping rack (21), two scraping motors (24) are provided. At both ends of one of the conveyor rollers (23), first belt pulleys (25) are provided at the output ends of the two scraping motors (24). The surfaces of the two first belt pulleys (25) are connected by belt drive. A number of scraping plates (26) are provided on the surface of the conveyor belt (22). The scraping plate (26) is composed of a fixed plate (261) and a movable plate (262). One side of the fixed plate (261) is connected to the surface of the conveyor belt (22). A movable plate (262) is rotatably provided on one side of the fixed plate (261). Grooves (263) are provided on both sides of the movable plate (262). Inside both of the grooves (263), a rotating shaft (264) is provided. One end of each of the two rotating shafts (264) is connected to the inner wall of the fixed plate (261). Limiting torsion springs (265) are sleeved on the surfaces of the two rotating shafts (264). On one side inside the second settling tank, an air-blowing mechanism (90) is further provided. The air-blowing mechanism (90) includes an air-blowing box (31). The air-blowing box (31) is provided at the bottom of the inner wall of the second settling tank. A filter plate (32) is provided below one side of the air-blowing box (31). A piston rack (33) is slidably provided inside the air-blowing box (31). A sealing strip (34) is provided on the peripheral surface of the piston rack (33). Screws (35) are provided on both sides of the top of the piston rack (33). Driving rods (36) are rotatably provided on both sides of the top of the air-blowing box (31). The bottom ends of the two driving rods (36) are respectively threadedly connected to the top ends of the two screws (35). An air-blowing motor (37) is provided on the top inner wall of the air-blowing box (31). One end of the output shaft of the air-blowing motor (37) extends to the top of the air-blowing box (31). Second belt pulleys (38) are provided at the top ends of the output shaft of the air-blowing motor (37) and the top ends of the two driving rods (36). The surfaces of the three second belt pulleys (38) are connected by belt drive. The material turning assembly includes a material turning roller (11) and a material turning sieve plate (12). The material turning roller (11) is rotatably arranged inside the sedimentation frame (60), and a number of material turning sieve plates (12) are equiangularly distributed on the surface of the material turning roller (11). A material turning motor (13) is arranged on the front surface of the sedimentation frame (60), and the output shaft of the material turning motor (13) is connected to one end of the material turning roller (11). A discharge hopper (14) is arranged at the bottom of the sedimentation frame (60), and the inside of the discharge hopper (14) is communicated with the inside of the sedimentation frame (60).

2. The device for washing and coking clean coal using inferior coal according to claim 1, wherein: Uniform material rollers (80) are rotatably arranged inside both the first sedimentation tank and the second sedimentation tank, and the rear ends of the two uniform material rollers (80) are driven by motors.

3. A device for washing and coking clean coal using inferior coal according to claim 1, characterized in that: A top plate (39) is further arranged on the top of the air blowing box (31).

4. A method for washing and coking fine coal using inferior coal, characterized in that: The specific steps are as follows: Step 1: Feed the inferior coal into the inside of the washing rack (10) through the feeding hopper (20), introduce the suspension into the inside of the washing rack (10) through the liquid inlet pipe (30), and at the same time, let the two uniform material rollers (80) rotate in the first sedimentation tank and the second sedimentation tank respectively in opposite rotation directions. Step 2: After the inferior coal enters the inside of the first sedimentation tank, drive the scraping plate (26) to rotate through the conveyor belt (22). The lower side of the scraping plate (26) quickly collects the upper-layer clean coal inside the washing rack (10), and makes the clean coal in the upper-layer flotation enter the inside of the collection pipe (40) for quick collection. Step 3: When washing the inferior coal inside the second sedimentation tank, drive the two drive rods (36) to rotate synchronously in the same direction inside the air blowing box (31) by the output shaft of the air blowing motor (37). During the rotation of the two drive rods (36), the two drive rods (36) move downward. When the piston frame (33) descends to the lower part inside the air blowing box (31), control the output shaft of the air blowing motor (37) to rotate in the reverse direction, change the rotation direction of the two drive rods (36), and then drive the piston frame (33) to move upward by the two screw rods (35), so that the piston frame (33) moves up and down inside the air blowing box (31), making the suspension inside the second sedimentation tank continuously gush out from the inside of the air blowing box (31), separating the coal slime and the clean coal, and making the clean coal in the coal slime float to the upper layer of the suspension to be collected. Step 4: When washing and coking clean coal from the inferior coal inside the first sedimentation tank and the second sedimentation tank, drive the material turning roller (11) to rotate inside the sedimentation frame (60) by the output end of the material turning motor (13). The material turning sieve plates (12) on the surface of the material turning roller (11) rotate inside the sedimentation frame (60), turn the coal slime accumulated in the sedimentation frame (60), make the clean coal mixed in the coal slime float under the action of buoyancy, and finally collect and process the gangue and coal slime inside the sedimentation frame (60) by using the discharge hopper (14).

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