Classified filtering and screening device for coal slurry concentration

Abstract

The present application relates to coal chemical technology field, disclose a kind of for coal slurry concentration with grading filter screening device, including shell, the top outer wall of the shell is fixed with first motor, the output end of the first motor is fixed with first stirring rod, the outer wall of the first stirring rod rotates in the inner wall of shell, the outer wall of the first stirring rod is fixed with scraper rake, the inner wall of the shell is fixed with blocking net, the lower surface of the scraper rake rotates in the upper surface of blocking net, the inner wall of the shell is close to the lower surface of discharge assembly of feed inlet, the discharge assembly includes baffle, the outer wall of the baffle slides in the inner wall of shell. By the two-stage different aperture screen of blocking net and filter screen, the layered interception and screening of coarse and fine impurities, particles are realized, blocking net retains steel ball, large coal cinder, and inclined scraper and scraper rake can clean accumulated material, can prevent coal dust adhesion, block mesh, reach the effect of reducing downtime maintenance frequency.

Description

Technical Field

[0001] This invention relates to the field of coal chemical technology, specifically to a graded filtration and screening device for coal slurry concentration. Background Technology

[0002] Coal slurry generally refers to coal-water slurry, a liquid-solid two-phase suspension fluid commonly used in coal chemical industry and clean coal combustion. It is made by mixing and grinding coal powder, water, and a small amount of chemical additives in a specific ratio. It belongs to coal-based liquid raw materials or fuels. The primary coal slurry produced by fine grinding mills will contain hard impurities such as grinding steel balls, large pieces of gangue, and coarse coal blocks. If it is directly concentrated, the hard objects will impact various parts. Moreover, the coal slurry contains sticky fine coal powder, which is very easy to adhere and accumulate.

[0003] In related technologies, coal slurry screening equipment usually adopts a fixed screen structure. However, the wet coal powder produced by the fine grinding mill has a high viscosity, which will adhere to the screen surface and block the screen holes, resulting in a decrease in screening efficiency. At this time, it is necessary to stop the machine and manually clean and unclog it, which increases labor costs and reduces the concentration efficiency. Summary of the Invention

[0004] This invention provides a grading and filtration screening device for coal slurry thickening, which solves the problem in related technologies that the powder produced by fine grinding mills has high viscosity, which will adhere to the screen surface and block the screen holes. At this time, the machine needs to be stopped for manual cleaning and unblocking, which increases labor costs and reduces thickening efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a grading and screening device for coal slurry concentration, comprising a housing, a first motor fixed to the top outer wall of the housing, a first stirring rod fixed to the output end of the first motor, the outer wall of the first stirring rod rotating on the inner wall of the housing, a scraper fixed to the outer wall of the first stirring rod, a baffle fixed to the inner wall of the housing, the lower surface of the scraper rotating on the upper surface of the baffle, an inclined scraper and a support column fixed to the outer wall of the first stirring rod, a rolling wheel rotating on the outer wall of the support column, a filter screen fixed to the inner wall of the housing, the lower surface of the inclined scraper sliding on the upper surface of the filter screen, a feed inlet on the inner wall of the housing, and a feeding assembly on the inner wall of the housing near the feed inlet, the feeding assembly including a baffle, the outer wall of the baffle sliding on the inner wall of the housing.

[0006] By adopting the above technical solution, the fine grinding mill is first connected to the feed inlet, so that the mixture discharged from the fine grinding mill falls onto the barrier screen. The barrier screen allows coal powder to pass through, while steel balls and incompletely refined coal lumps are blocked by the barrier screen. At this time, the first motor is started to drive the first stirring rod and scraper to rotate synchronously. During the rotation of the scraper, the coal powder attached to the surface of the barrier screen is scraped off, and the steel balls in the center of the barrier screen are pushed to move to the periphery of the barrier screen. The steel balls will enter the feeding component, which can facilitate the discharge of the steel balls. When the coal powder falls, it will pass through the filter screen, while those that cannot pass will be broken up or crushed by the crushing wheel. The inclined scraper can scrape off the coal powder attached to the surface of the filter screen. Then the baffle is opened to allow the steel balls and coal lumps to be fed back into the fine grinding mill for further grinding. This structure, in combination with the barrier screen and filter screen and other structures, can achieve multi-stage filtration and screening of coal powder, while mixing the coal powder with industrial water to prepare for the subsequent formation of coal slurry and thickening.

[0007] Preferably, an elastic element is fixedly connected between the upper surface of the baffle and the inner wall of the outer shell, a pull rod is fixedly connected to the outer wall of the baffle, the upper and lower surfaces of the pull rod are slidably connected to the inner wall of the outer shell, and the outer shell between the outer wall of the baffle and the outer wall of the barrier net is designed with an inclination.

[0008] Preferably, a sliding column is fixedly connected to the inner wall of the baffle, and counterweights are fixedly connected to the outer walls of both ends of the sliding column. The outer walls of the counterweights are slidably connected to the inner wall of the outer shell.

[0009] Preferably, the inner wall of the baffle is provided with two sets of mounting grooves, and the inner wall of the outer shell is slidably connected with a mounting column, the outer wall of the mounting column being engaged with the inner wall of the mounting groove.

[0010] Preferably, the outer wall of the outer shell is provided with a concentration component, the concentration component includes a second motor, the outer wall of the second motor is fixedly connected to the outer wall of the outer shell, the output end of the second motor is fixedly provided with a second stirring rod, and the outer wall of the second stirring rod is rotatably connected to the inner wall of the outer shell.

[0011] Preferably, the inner wall of the outer shell is provided with a heating plate, a water inlet pipe and a discharge port, the inner wall of the outer shell is provided with a second one-way valve laterally, and the inner wall of the outer shell is provided with a first one-way valve at an angle.

[0012] Preferably, an electric push rod is fixedly connected to the top outer wall of the outer shell, a connecting column is fixedly provided at the output end of the electric push rod, a piston plate is fixedly connected to the outer wall of the connecting column, the outer wall of the piston plate is slidably connected to the outer wall of the second stirring rod, the inner wall of the piston plate is slidably connected to the inner wall of the outer shell, a guide block is fixedly connected to the lower surface of the piston plate, and the outer wall of the guide block is fixedly connected to the outer wall of the connecting column.

[0013] Preferably, the inner wall of the guide block is fixedly connected to a guide strip, the outer wall of the guide block is slidably connected to the inner wall of the outer shell, the inner wall of the guide block is slidably connected to the outer wall of the second stirring rod, and the lower surface of the guide block is fixedly connected to an annular plate, the outer wall of the annular plate being slidably connected to the inner wall of the outer shell.

[0014] Preferably, a water suction pipe is fixedly connected to the inner wall of the guide block, the lower side of the water suction pipe is in contact with the inner wall of the annular plate, the outer wall of the water suction pipe is fixedly connected to the inner wall of the connecting column, and a fixing column is fixedly connected to the inner wall of the connecting column.

[0015] Preferably, a telescopic tube is fixedly connected to the inner wall of the fixed column, and the telescopic tube is connected to the water suction pipe and the fixed column. The inner wall of the outer shell is fixedly connected to the outer wall of the telescopic tube. A switch valve is provided on the upper surface of the outer shell, and the inner wall of the switch valve is provided on the outer wall of the telescopic tube.

[0016] This invention provides a grading and screening device for coal slurry thickening. It has the following beneficial effects: 1. This invention uses two-stage screens with different apertures—a barrier screen and a filter screen—to achieve stratified interception and screening of coarse and fine impurities and particles. The barrier screen traps steel balls and large pieces of coal slag, while the filter screen controls the particle size of the finished coal slurry. Furthermore, the first stirring rod drives the grinding wheel and the inclined scraper to operate synchronously, eliminating the need to return coarse material to the fine grinding mill for secondary grinding. The inclined scraper and scraper rake can clean up accumulated material, preventing coal powder from adhering to and clogging the screen, thus reducing the frequency of downtime maintenance.

[0017] 2. This invention uses the inclined structure of the barrier net and the pushing action of the scraper to push steel balls and large pieces of coal slag to the feeding component area. The baffle can be opened quickly through the cooperation of structures such as baffles, elastic elements, and mounting columns, which can facilitate the recovery of steel balls and return them to the fine grinding mill for reuse.

[0018] 3. The present invention uses a guide block, a guide strip, an annular plate, a water suction pipe, and a telescopic pipe to form a condensate collection circuit. The electric push rod drives the piston plate to form a water vapor purging circuit with the first one-way valve and the second one-way valve. The guide strip can collect condensate and prevent condensate from flowing back into the coal slurry, thereby improving the concentration efficiency and stabilizing the concentration.

[0019] 4. This invention uses an electric push rod to push and pull the piston plate to slide, so that the water inlet pipe can stably deliver water or air. With the water suction pipe and the switch valve, the pressure on the upper and lower sides of the piston plate can be stabilized. Thus, when the piston plate slides, water or gas can be sprayed in reverse through the first one-way valve into the two-stage screen, which can achieve a continuous blowing and cleaning effect. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the discharge port structure of the present invention; Figure 3 This is a schematic diagram of the barrier net structure of the present invention; Figure 4 This is a schematic diagram of the filter screen structure of the present invention; Figure 5 This is a schematic diagram of the baffle structure of the present invention; Figure 6 This is a schematic diagram of the counterweight structure of the present invention; Figure 7 This is a schematic diagram of the piston plate structure of the present invention; Figure 8 This is a schematic diagram of the flow guide block structure of the present invention.

[0021] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0022] The components are as follows: 1. Outer shell; 2. First motor; 3. First stirring rod; 4. Scraper rake; 5. Barrier net; 6. Filter screen; 7. Support column; 8. Compactor wheel; 9. Inclined scraper; 10. Feeding assembly; 101. Mounting column; 102. Elastic element; 103. Baffle; 104. Counterweight; 105. Sliding column; 106. Mounting groove; 107. Pull rod; 11. Feed inlet; 12. Concentration assembly; 1201. Second motor; 12 02. Second stirring rod; 1203. Electric push rod; 1204. Connecting column; 1205. Piston plate; 1206. Guide block; 1207. Annular plate; 1208. Guide strip; 1209. Water suction pipe; 1210. Fixed column; 1211. Telescopic pipe; 1212. Switch valve; 1213. Water inlet pipe; 1214. First check valve; 1215. Heating plate; 1216. Second check valve; 1217. Discharge port. Detailed Implementation

[0023] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see the appendix Figure 1 - Appendix Figure 5This invention provides a grading and screening device for coal slurry thickening, comprising a housing 1, a first motor 2 fixed to the top outer wall of the housing 1, a first stirring rod 3 fixedly disposed at the output end of the first motor 2, the outer wall of the first stirring rod 3 rotating on the inner wall of the housing 1, a scraper 4 fixed to the outer wall of the first stirring rod 3, a barrier net 5 fixed to the inner wall of the housing 1, the lower surface of the scraper 4 rotating on the upper surface of the barrier net 5, an inclined scraper 9 and a support column 7 respectively fixed to the outer wall of the first stirring rod 3, a rolling wheel 8 rotating on the outer wall of the support column 7, a filter screen 6 fixed to the inner wall of the housing 1, the lower surface of the inclined scraper 9 sliding on the upper surface of the filter screen 6, a feed inlet 11 opened on the inner wall of the housing 1, a feeding assembly 10 disposed on the inner wall of the housing 1 near the feed inlet 11, the feeding assembly 10 including a baffle 103, the outer wall of the baffle 103 sliding on the inner wall of the housing 1.

[0025] Specifically, firstly, the fine grinding mill is connected to the outer shell 1 through the feed inlet 11, so that the fine grinding mill discharges the mixture of ground coal powder and steel balls into the outer shell 1. At this time, the mixture will fall onto the barrier net 5, and the barrier net 5 is fixed to the inner wall of the outer shell 1 and close to the feeding component 10. At this time, the barrier net 5 allows the coal powder to pass through, while the steel balls and the not fully refined coal lumps will be blocked by the barrier net 5. Since the barrier net 5 is inclined towards the center at a small angle, the steel balls and the not fully refined coal lumps will gradually move towards the center of the barrier net 5. The first motor 2 installed on the upper side of the start-up housing 1 drives the first stirring rod 3 to rotate, which in turn drives the scraper 4 to rotate synchronously. The first motor 2 and the first stirring rod 3 are low-speed stirrs, which facilitates the mixing of coal powder with industrial water or other materials. At this time, the scraper 4 rotates on the outer wall of the barrier net 5. The scraper 4 is designed in an S-shape, so that the scraper 4 will scrape off the coal powder attached to the surface of the barrier net 5 during the rotation. Moreover, the special design of the scraper 4 will push the steel ball at the center of the barrier net 5 to move to the periphery of the barrier net 5. Since there is a feeding component 10 near the barrier net 5, the steel ball will enter the feeding component 10, which can facilitate the discharge of the steel ball. Secondly, the through holes of the barrier net 5 are large-diameter, which can block steel balls, large coal chunks, and other impurities from passing through. When large coal ore can be broken up, it will fall onto the filter net 6, while when it cannot be broken up, it will be discharged into the feeding assembly 10. At this time, coal powder falls onto the filter net 6, which has small-diameter through holes. The coal powder can then pass through the filter net 6 and enter the lower side of the filter net 6. Since the first stirring rod 3 rotates, it will drive the inclined scraper 9 and the support column 7 to rotate synchronously, and the inclined scraper 9 is in contact with the filter net 6. However, the rolling roller 8 installed on the outer wall of the support column 7 does not contact the filter screen 6. At this time, the coal powder passes directly through the filter screen 6, while the coal powder that cannot pass through will be impacted and broken up by the rolling roller 8 or crushed by the rolling roller 8. Due to the inclined design of the inclined scraper 9, the inclined scraper 9 can scrape off the coal powder attached to the surface of the filter screen 6. Furthermore, the lower side of the filter screen 6 all the way to the radius of the support column 7 contains industrial water or other substances, which allows the first stirring rod 3 to work with the inclined scraper 9 and the rolling roller 8 to stir and mix synchronously and scrape off the coal powder. Finally, the baffle 103 is opened to allow the steel ball and coal to be fed back into the fine grinding mill for further grinding. This structure, in conjunction with other structures such as the barrier net 5 and the filter net 6, can achieve multi-stage filtration and screening of coal powder while mixing the coal powder with industrial water to prepare for the subsequent formation of coal slurry and concentration.

[0026] Please see the appendix Figure 4 - Appendix Figure 6 An elastic element 102 is fixedly connected between the upper surface of the baffle 103 and the inner wall of the outer shell 1. A pull rod 107 is fixedly connected to the outer wall of the baffle 103. The upper and lower surfaces of the pull rod 107 are slidably connected to the inner wall of the outer shell 1. The outer shell 1 between the outer wall of the baffle 103 and the outer wall of the barrier net 5 adopts an inclined design. A sliding column 105 is fixedly connected to the inner wall of the baffle 103. A counterweight 104 is fixedly connected to the outer walls of both ends of the sliding column 105. The outer walls of the counterweight 104 are slidably connected to the inner wall of the outer shell 1. Two sets of mounting grooves 106 are opened on the inner wall of the baffle 103. An mounting post 101 is slidably connected to the inner wall of the outer shell 1. The outer wall of the mounting post 101 is engaged with the inner wall of the mounting groove 106.

[0027] Specifically, when the steel ball falls onto the barrier net 5 and is pushed by the scraper rake 4 to move to the perimeter of the barrier net 5, only the baffle 103 and the barrier net 5 are inclined, so that the steel ball can contact the baffle 103 through the inclined structure of the outer shell 1. The steel balls that cannot contact the baffle 103 around the perimeter of the barrier net 5 will fall back to the center of the barrier net 5, so that the steel ball can be stably discharged to the baffle 103. When it is necessary to open the baffle 103, pull the mounting column 101 to disengage it from the outer shell 1 and the baffle 103. At this time, pull the lever 107 to drive the baffle 103 to slide synchronously, so that the baffle 103 slides and compresses the elastic element 102. When the upper surface of the lever 107 contacts the inner wall of the outer shell 1, the mounting column 101 can be installed on the inner wall of the outer shell 1 and the baffle 103. At this time, the mounting column 101 will enter the mounting groove 106, and the elastic element 102 will push the baffle 103. With the help of the counterweight 104, the baffle 103 can hold the mounting column 101, which can prevent the baffle 103 from falling off. When the baffle 103 is opened, the steel balls can be discharged. At this time, the collected steel balls can be put back into the fine grinding mill. When the baffle 103 is closed, pull out the mounting post 101 to detach it from the housing 1, the baffle 103, and the mounting groove 106. At this time, the elastic element 102 will push the baffle 103 to reset, and the counterweight 104, together with the sliding post 105, will press down the baffle 103, so that the lower surface of the pull rod 107 is in contact with the inner wall of the housing 1. At this time, the mounting post 101 is reinstalled into the inner wall of the housing 1, the baffle 103, and the mounting groove 106, which can achieve the effect of quickly locking the baffle 103.

[0028] Please see the appendix Figure 2 and attached Figure 7 The outer wall of the outer shell 1 is provided with a concentration component 12, which includes a second motor 1201. The outer wall of the second motor 1201 is fixedly connected to the outer wall of the outer shell 1. The output end of the second motor 1201 is fixedly provided with a second stirring rod 1202. The outer wall of the second stirring rod 1202 is rotatably connected to the inner wall of the outer shell 1. The inner wall of the outer shell 1 is provided with a heating plate 1215, a water inlet pipe 1213 and a discharge port 1217. The inner wall of the outer shell 1 is provided with a second one-way valve 1216 laterally and a first one-way valve 1214 inclinedly.

[0029] Specifically, after the first stirring rod 3 stirs and mixes the coal powder, the coal slurry will flow through the second one-way valve 1216. The second one-way valve 1216 can only allow the coal slurry on the filter screen 6 side to flow to the thickening component 12 side, while the first one-way valve 1214 can only allow the industrial water on the thickening component 12 side to enter the barrier screen 5 side, which can prevent the coal slurry or coal powder from flowing inside the outer shell 1. When the coal slurry enters the second stirring rod 1202 side, the heating plate 1215 will heat the coal slurry, which can accelerate the evaporation of water and thus increase the coal slurry concentration. At this time, the second motor 1201 is started to drive the second stirring rod 1202 to rotate, so that the second stirring rod 1202 can stir the coal slurry and accelerate the heating efficiency of the heating plate 1215 on the coal slurry. The second stirring rod 1202 controlled by the second motor 1201 has a higher speed than the first stirring rod 3. When the coal slurry is thickened, it is discharged through the discharge port 1217, while the water inlet pipe 1213 supplies water or other mixtures to the inside of the outer shell 1.

[0030] Please see the appendix Figure 7 and attached Figure 8 An electric push rod 1203 is fixedly connected to the top outer wall of the outer casing 1. A connecting post 1204 is fixedly installed at the output end of the electric push rod 1203. A piston plate 1205 is fixedly connected to the outer wall of the connecting post 1204. The inner wall of the piston plate 1205 is slidably connected to the outer wall of the second stirring rod 1202. The outer wall of the piston plate 1205 is slidably connected to the inner wall of the outer casing 1. A guide block 1206 is fixedly connected to the lower surface of the piston plate 1205. The outer wall of the guide block 1206 is fixedly connected to the outer wall of the connecting post 1204. A guide strip 1208 is fixedly connected to the inner wall of the guide block 1206. The outer wall of the guide block 1206 is slidably connected to the inner wall of the outer casing 1. The inner wall of the guide block 1206 is slidably connected to the outer wall of the second stirring rod 1202. An annular plate 1207 is fixedly connected to the lower surface of the housing 6. The outer wall of the annular plate 1207 is slidably connected to the inner wall of the housing 1. A water suction pipe 1209 is fixedly connected to the inner wall of the guide block 1206. The lower side of the water suction pipe 1209 is in contact with the inner wall of the annular plate 1207. The outer wall of the water suction pipe 1209 is fixedly connected to the inner wall of the connecting column 1204. A fixing column 1210 is fixedly connected to the inner wall of the connecting column 1204. A telescopic pipe 1211 is fixedly connected to the inner wall of the fixing column 1210. The telescopic pipe 1211 communicates with the water suction pipe 1209 and the fixing column 1210. The inner wall of the housing 1 is fixedly connected to the outer wall of the telescopic pipe 1211. A switch valve 1212 is provided on the upper surface of the housing 1. The inner wall of the switch valve 1212 is provided on the outer wall of the telescopic pipe 1211.

[0031] Specifically, in the initial state, the piston plate 1205, the guide block 1206, and the annular plate 1207 are located on the middle side of the inner wall of the outer shell 1. After the first stirring rod 3 finishes stirring the coal slurry, the electric push rod 1203 is activated to pull the connecting column 1204 to slide, so that the connecting column 1204 drives the piston plate 1205 and the guide block 1206 to slide. The guide block 1206 will drive the annular plate 1207 to clean the inner wall of the outer shell 1. At this time, the sliding of the guide block 1206 and the piston plate 1205 will create a negative pressure below the guide block 1206, so that the second one-way valve 1216 opens and allows the coal slurry to enter the second stirring rod 1202 through the guide block 1206, which can achieve the effect of conveniently transporting the coal slurry. The first one-way valve 1214 and the second one-way valve 1216 both adopt existing technology and will not be described in detail here. When the coal slurry is fully introduced into the second stirring rod 1202, the electric push rod 1203 is activated to push the connecting column 1204, piston plate 1205, guide block 1206 and annular plate 1207 to slide synchronously, so that the guide block 1206 pressurizes the coal slurry below. At this time, in conjunction with the stirring and heating of the second stirring rod 1202 and heating plate 1215, the effect of accelerating the concentration of coal slurry can be achieved. Since the heating plate 1215 heats the coal slurry, the water in the coal slurry will evaporate and be adsorbed by the conical surface of the guide block 1206. The guide strip 1208 installed on the outer wall of the guide block 1206 will adsorb the evaporated water and guide it, so that the water can be discharged into the annular plate 1207. When the guide block 1206 pressurizes the coal slurry and the annular plate 1207 is not full of water, the discharge port 1217 can be opened to allow the coal slurry to be discharged quickly through the discharge port 1217, and the pressure on the lower side of the guide block 1206 will decrease. When the annular plate 1207 is full of water, the switch valve 1212 can be opened to allow the water suction pipe 1209 to absorb the water in the annular plate 1207 and discharge it through the fixed column 1210 and the telescopic pipe 1211. Since the telescopic pipe 1211 is designed to be telescopic, the telescopic pipe 1211 can be stably connected to the fixed column 1210 when the piston plate 1205 slides. The number of times the switch valve 1212 is opened can be coordinated with the electric push rod 1203. After the electric push rod 1203 pushes and pulls several times, the switch valve 1212 can be opened once. After the water inside the annular plate 1207 is discharged, it is closed. At this time, the discharge port 1217 is opened to allow the coal slurry to be discharged. The water inlet pipe 1213 installed on the inner wall of the outer casing 1 can supply water or air. When water is needed inside the outer casing 1 on the side of the first stirring rod 3, the electric push rod 1203 is activated to push the piston plate 1205 to slide. At this time, the switch valve 1212 is opened to keep the air pressure under the guide block 1206 stable. Since the piston plate 1205 slides downward, a negative pressure is formed on the upper side of the piston plate 1205. The piston plate 1205 will draw water into the water inlet pipe 1213 to maintain the air pressure on the upper side of the electric push rod 1203. The electric push rod 1203 is activated to pull the piston plate 1205 to slide, causing the piston plate 1205 to squeeze water and discharge it through the first one-way valve 1214. Due to the inclined design of the first one-way valve 1214, the water is pressurized and discharged through the first one-way valve 1214, thereby achieving the effect of stabilizing and cleaning the barrier net 5. The water flows through the barrier net 5 and the filter net 6 into the interior of the outer shell 1, which can provide water for the coal slurry. When the water inlet pipe 1213 delivers air, the usage method is the same as the above process. When it is necessary to clean the inside of the outer casing 1, simply allow the water inlet pipe 1213 to supply water and allow the piston plate 1205 to slide back and forth continuously, so that the water continuously circulates on the inner wall of the outer casing 1 and is finally discharged from the discharge port 1217, which can achieve the effect of quickly cleaning the inside of the outer casing 1.

[0032] Work process: First, the coal powder, grinding steel balls, and mixed water produced by the fine grinding mill are fed into the inner shell 1 of the device through the feed inlet 11. The material first falls onto the surface of the barrier net 5. At this time, the first motor 2 is started to drive the first stirring rod 3 to rotate at low speed. The scraper 4 installed on the outer wall of the first stirring rod 3 will operate synchronously. At this time, the scraper 4 can scrape off the coal powder adhering to the surface of the barrier net 5 to prevent the mesh from clogging. At the same time, it pushes the intercepted steel balls and large pieces of coal slag to move around the barrier net 5. The material passing through the barrier net 5 falls onto the small-diameter filter screen 6. The first stirring rod 3 synchronously drives the inclined scraper 9, the support column 7, and the rolling wheel 8 to rotate. The inclined scraper 9 cleans the material on the surface of the filter screen 6. The rolling wheel 8 does not contact the filter screen and crushes and disperses the coarse coal particles intercepted on the filter screen. The refined particles fall through the filter screen 6 to complete the secondary particle size screening. When it is necessary to recycle the steel balls, pull the lever 107 to drive the baffle 103 to slide and compress the elastic element 102. At this time, pull out the mounting column 101 to release the lock. After the baffle 103 is opened, the steel balls and large pieces of coal slag in the feeding assembly 10 are discharged and sent back to the fine grinding mill for re-grinding. After discharge, the baffle 103 is reset and the mounting column 101 is inserted to lock it in place. The primary coal slurry, formed by two-stage screening and mixing, accumulates in the cavity below the filter screen 6. At this time, the electric push rod 1203 is activated to pull the connecting column 1204 upward, causing the piston plate 1205, guide block 1206, and annular plate 1207 to move upward simultaneously. A negative pressure is formed below the guide block 1206, causing the second one-way valve 1216 to open and allowing the coal slurry to flow in. At this time, the electric push rod 1203 is activated to push the piston assembly downward in the opposite direction, and the second one-way valve 1216 is reset and closed, blocking the backflow of the coal slurry. The hot plate 1215 continuously heats the coal slurry, evaporating the free water inside the coal slurry. At the same time, the second motor 1201 is started to drive the second stirring rod 1202 to run, stirring the coal slurry to make the heating uniform, accelerate the evaporation of water, and increase the solid content of the coal slurry. The water vapor generated by heating contacts the guide block 1206 and the guide strip 1208 and flows into the bottom annular plate 1207. When the water in the annular plate 1207 accumulates to a certain amount, the switch valve 1212 is opened. The accumulated water is discharged outward through the water suction pipe 1209, the fixed column 1210, and the telescopic pipe 1211. After the drainage is completed, the switch valve 1212 is closed. A water inlet pipe 1213 is connected to the outside of the device, through which clean water or compressed air can be introduced. The electric push rod 1203 pushes the piston plate 1205 downward, creating a negative pressure on the upper side of the piston plate 1205, which draws out the water and air in the water inlet pipe 1213. At this time, the electric push rod 1203 pushes the piston plate 1205 upward, causing the first one-way valve 1214 to open. High-pressure water and air are sprayed in the opposite direction to the left side, thoroughly blowing and cleaning the barrier net 5 and the filter net 6, enabling the equipment to self-clean.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grading and screening device for coal slurry thickening, comprising a shell (1), characterized in that, A first motor (2) is fixed to the top outer wall of the outer shell (1). A first stirring rod (3) is fixed to the output end of the first motor (2). The outer wall of the first stirring rod (3) rotates on the inner wall of the outer shell (1). A scraper (4) is fixed to the outer wall of the first stirring rod (3). A barrier net (5) is fixed to the inner wall of the outer shell (1). The lower surface of the scraper (4) rotates on the upper surface of the barrier net (5). An inclined scraper (9) and a support are respectively fixed to the outer wall of the first stirring rod (3). The outer wall of the support column (7) is rotated with a rolling wheel (8), the inner wall of the outer shell (1) is fixed with a filter screen (6), the lower surface of the inclined scraper (9) slides on the upper surface of the filter screen (6), the inner wall of the outer shell (1) is provided with a feed inlet (11), and the inner wall of the outer shell (1) near the feed inlet (11) is provided with a feeding assembly (10), the feeding assembly (10) includes a baffle (103), the outer wall of the baffle (103) slides on the inner wall of the outer shell (1).

2. The graded filtration and screening device for coal slurry concentration according to claim 1, characterized in that, An elastic element (102) is fixedly connected between the upper surface of the baffle (103) and the inner wall of the outer shell (1). A pull rod (107) is fixedly connected to the outer wall of the baffle (103). The upper and lower surfaces of the pull rod (107) are slidably connected to the inner wall of the outer shell (1). The outer shell (1) between the outer wall of the baffle (103) and the outer wall of the barrier net (5) is designed to be inclined.

3. The graded filtration and screening device for coal slurry thickening according to claim 2, characterized in that, The inner wall of the baffle (103) is fixedly connected to a sliding column (105), and the outer walls of both ends of the sliding column (105) are fixedly connected to counterweights (104). The outer walls of the counterweights (104) are slidably connected to the inner wall of the outer shell (1).

4. The graded filtration and screening device for coal slurry thickening according to claim 3, characterized in that, The inner wall of the baffle (103) is provided with two sets of mounting grooves (106), and the inner wall of the outer shell (1) is slidably connected with a mounting post (101), and the outer wall of the mounting post (101) is engaged with the inner wall of the mounting groove (106).

5. The graded filtration and screening device for coal slurry concentration according to claim 1, characterized in that, The outer wall of the outer shell (1) is provided with a concentration component (12), the concentration component (12) includes a second motor (1201), the outer wall of the second motor (1201) is fixedly connected to the outer wall of the outer shell (1), the output end of the second motor (1201) is fixedly provided with a second stirring rod (1202), and the outer wall of the second stirring rod (1202) is rotatably connected to the inner wall of the outer shell (1).

6. The graded filtration and screening device for coal slurry thickening according to claim 5, characterized in that, The inner wall of the outer shell (1) is provided with a heating plate (1215), a water inlet pipe (1213) and a discharge port (1217). The inner wall of the outer shell (1) is provided with a second one-way valve (1216) in the horizontal direction and a first one-way valve (1214) in the inclined direction.

7. The graded filtration and screening device for coal slurry thickening according to claim 5, characterized in that, An electric push rod (1203) is fixedly connected to the top outer wall of the outer shell (1). A connecting column (1204) is fixedly provided at the output end of the electric push rod (1203). A piston plate (1205) is fixedly connected to the outer wall of the connecting column (1204). The inner wall of the piston plate (1205) is slidably connected to the outer wall of the second stirring rod (1202). The outer wall of the piston plate (1205) is slidably connected to the inner wall of the outer shell (1). A guide block (1206) is fixedly connected to the lower surface of the piston plate (1205). The outer wall of the guide block (1206) is fixedly connected to the outer wall of the connecting column (1204).

8. The graded filtration and screening device for coal slurry thickening according to claim 7, characterized in that, The inner wall of the guide block (1206) is fixedly connected to the guide strip (1208), the outer wall of the guide block (1206) is slidably connected to the inner wall of the outer shell (1), the inner wall of the guide block (1206) is slidably connected to the outer wall of the second stirring rod (1202), the lower surface of the guide block (1206) is fixedly connected to the annular plate (1207), and the outer wall of the annular plate (1207) is slidably connected to the inner wall of the outer shell (1).

9. The grading and screening device for coal slurry thickening according to claim 8, characterized in that, The inner wall of the guide block (1206) is fixedly connected to a water suction pipe (1209), the lower side of the water suction pipe (1209) is in contact with the inner wall of the annular plate (1207), the outer wall of the water suction pipe (1209) is fixedly connected to the inner wall of the connecting column (1204), and the inner wall of the connecting column (1204) is fixedly connected to a fixing column (1210).

10. The graded filtration and screening device for coal slurry concentration according to claim 9, characterized in that, The inner wall of the fixed column (1210) is fixedly connected to the telescopic pipe (1211), and the telescopic pipe (1211) is connected to the water suction pipe (1209) and the fixed column (1210). The inner wall of the outer shell (1) is fixedly connected to the outer wall of the telescopic pipe (1211). The upper surface of the outer shell (1) is provided with a switch valve (1212), and the inner wall of the switch valve (1212) is provided on the outer wall of the telescopic pipe (1211).

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