1143 results about "Small particles" patented technology

The utility model relates to the technical field of dust screening equipment, and particularly discloses a pipeline type vortex dust screening device which comprises a main shell, an annular cavity is formed in the main shell, a variable-diameter vortex assembly is arranged at one end of the main shell and comprises a conical barrel, one end of the conical barrel is communicated with the annular cavity, and the other end of the conical barrel is communicated with the annular cavity. A guide turbofan is mounted at the other end; the pipeline type vortex dust screening device flows through the inner wall of the conical barrel and forms vortex flow under the guiding action of the multiple guide blades, so that a buffering section is formed, meanwhile, vortex airflow further enters the annular cavity and forms secondary buffering, and the dust screening effect is improved. According to the cyclone separator, the cyclone separator is arranged in the annular cavity, other large-mesh particle dust falls down and is collected in the vortex process of the annular cavity, relatively light small-particle dust is directly output, so that the required particle dust is screened, the whole structure is simple, maintenance is convenient, energy consumption is relatively low, meanwhile, the conical cylinder and the annular cavity jointly form secondary separation, and the separation efficiency is improved. And large particles can be better screened out.

The invention relates to the technical field of waste resourceful treatment, in particular to a sponge titanium weight bottom skin crushing and impurity removing method which comprises the following steps of peeling, bottom skin brake cutting, water jet cutting and crushing, acid leaching and impurity removing, ultrasonic cleaning, argon drying and screening and recycling. The bottom skin is crushed into small-granularity particles by adopting a cross grid water jet cutting technology, metal impurities such as Fe and Ni are removed in combination with acid leaching treatment, residual impurities are removed through multi-stage ultrasonic cleaning, oxidation discoloration is avoided through argon atmosphere drying, and meanwhile water jet sand is recycled; in the process, key indexes such as brake cutting pressure, cutting parameters, acid leaching time and ultrasonic frequency are accurately controlled through a quantification formula. The method effectively solves the problems that equipment is easy to damage during crushing and impurities are difficult to remove in a traditional process, remarkably improves the grade of bottom leather materials, widens the downstream application range, improves the resource utilization rate and economic benefits, and is suitable for industrial batch production.

The application provides a gas purification system for butyronitrile glove production and belongs to the technical field of waste gas purification. The application comprises a treatment tank and further comprises a spraying cleaning assembly and a flow guiding and impurity removing assembly. Large-particle impurities are intercepted through initial filtration by a filter plate, small particles are centrifugally separated by a spiral blade, and then the waste gas is treated in stages by cooperating the spraying cleaning assembly and the flow guiding and impurity removing assembly. The gas is fully contacted with the purification liquid through a temporary storage barrel and a conical cylinder, so that the up-and-down wrapping type purification is realized, the gas-liquid contact area and reaction time are greatly increased, the mass transfer efficiency is greatly improved, and the waste gas is ensured to meet the discharge standard. The device optimizes the contact mechanism in multiple dimensions. On the one hand, the spiral blade guides the waste gas to spiral upward, thereby prolonging the residence time of the waste gas in the treatment tank. On the other hand, the temporary storage barrel and the conical cylinder cooperate to make the gas fully contact with the storage liquid in the temporary storage barrel, the sliding liquid in the conical cylinder and the liquid sprayed by the nozzle in sequence, thereby forming a triple purification path, ensuring that the gas and liquid are fully mixed and reacted, and ensuring the purification effect.

A method for manufacturing composite cathode particles based on a dual-coated ternary oxide for an electrochemical battery by a high speed rotation includes the steps of: placing a plurality of large NCM (lithium nickel manganese cobalt oxide) particles and a glass phase material into a first mixer for stirring by a first high speed rotation to form a plurality of glass-phase-layer-contained NCM particles; then mixing a plurality of small LLZO particles and the glass-phase-layer-contained NCM particles by a second high speed rotation of a second mixer to form a plurality of composite NCM particles; and then mixing the composite NCM particles, a plurality of first carbon nanotubes and a plurality of nanoscale amorphous carbons to form a plurality of carbon-material-contained positive electrode particles.

The invention relates to the technical field of foam box waste recovery, and discloses a foam box production waste recovery device which comprises a support, and a feeding mechanism, a crushing mechanism and an extrusion mechanism are sequentially arranged on the support in the foam moving direction. The feeding mechanism comprises a base plate obliquely arranged on the support, the two ends of the base plate are rotationally connected with conveying rollers, the two conveying rollers are connected with the two ends of a conveying belt, a material taking needle is arranged on the outer side of the conveying belt, a suspension frame is arranged on the side face of the base plate, and a material guide groove parallel to the base plate is formed in the side, close to the ground, of the suspension frame. A high-voltage electrode plate is arranged on the side, close to the material guide groove, of the base plate, and after the material taking needle moves to the position between the high-voltage electrode plate and the material guide groove, static electricity is generated at the tip end of the material taking needle. By arranging the high-voltage electrode plate, the end of the material taking needle has static electricity, the material taking needle enables small-particle foam to directionally move along the material guide groove through the electrostatic adsorption effect, and flying of the small-particle foam is avoided.

The invention discloses a liquid collecting device for preventing circuit board etching waste liquid from precipitating, and relates to the technical field of etching waste liquid collection, the liquid collecting device comprises a collecting box, the top end of the collecting box is provided with a multi-layer treatment mechanism, the multi-layer treatment mechanism is used for putting a precipitating agent in the process of collecting the etching waste liquid and stirring the etching waste liquid during putting, and the collecting box is used for collecting the precipitating agent. The multi-layer treatment mechanism adsorbs the etching waste liquid after stirring treatment, a precipitant and the etching waste liquid are fully mixed through rotation of a treatment plate, formation of solid particles is facilitated, and the solid particles in the etching waste liquid can be buffered when the etching waste liquid is collected, so that abrasion between the solid particles and a separation structure is reduced, and the service life of the etching waste liquid is prolonged. Meanwhile, after the etching waste liquid is treated by the double-layer anti-precipitation mechanism, tiny particles in the etching waste liquid can be further adsorbed through rotation and reciprocating motion of the adsorption plate, so that the phenomenon that particle precipitation does not occur after the etching waste liquid is collected is ensured, and subsequent treatment of a user on the etching waste liquid is facilitated.

The invention belongs to the technical field of rainwater treatment, and particularly relates to an overflow and clarification integrated well structure suitable for a rainwater garden, the overflow and clarification integrated well structure comprises a well body shell, the well body shell is a vertically arranged hollow cavity structure; through three-stage purification of pretreatment, clarification and deep filtration, large-particle impurities are intercepted by a multi-way pipe intercepting net and a conical filter plate, suspended matter sedimentation is realized by a clarification cavity uniform distribution plate, a guide cylinder and sedimentation inclined holes, and small particles are intercepted and pollutants are adsorbed by filter fence filler, so that the rainwater quality is ensured to reach the standard, the pollution of a municipal pipe network is reduced, and the rainwater reuse potential is improved; buoyancy driving and mechanical limiting are combined to achieve full-automatic overflow control, when the water level rises, a buoyancy plate drives a component to start overflow and lock the component, when the water level drops, the component is automatically closed, and an anti-vortex plate and a guide vane guarantee overflow stability and prevent impurities from being involved in. And the linkage part periodically discharges impurities, external power is not needed, and the operation and maintenance cost is reduced.

The invention discloses a sulfur-containing magnetite beneficiation method which specifically comprises the following steps: S1, raw material preparation: crushing sulfur-containing magnetite to obtain small-particle sulfur-containing magnetite; s2, physicochemical property determination: detecting the particle size of the small-particle sulfur-containing magnetite, the content of magnetite in the small-particle sulfur-containing magnetite and the content of sulfur minerals in the small-particle sulfur-containing magnetite; s3, magnetic separation: according to the physicochemical properties of the small-particle sulfur-containing magnetite detected in the step S2, automatically controlling the magnetic field intensity of a magnetic separation process through a controller, and carrying out magnetic separation to obtain magnetite and sulfur-containing ore; the magnetic field intensity of the magnetic separation process is dynamically adjusted according to the iron ore particle size of the sulfur-containing magnetite, the magnetite content in the sulfur-containing magnetite and the sulfur mineral content, the trends of iron minerals and sulfur minerals are accurately controlled, optimal adjustment of the element trends is achieved, and the recovery rate of iron and sulfur is increased.

The invention discloses a high-dispersion and small-particle-size alpha-MoC1-x / SiO2 catalyst as well as a preparation method and application thereof. The catalyst is composed of alpha-MoC1-x nanoparticles dispersed on a silicon dioxide carrier, the alpha-MoC1-x / SiO2 catalyst is generated in a three-dimensional SiO2 confined network in a limited manner, wherein the three-dimensional SiO2 confined network is constructed by in-situ polycondensation of silica sol under the condition that the pH value is 2.3-2.8, and the molybdenum content is 30-60%; the average particle size of the alpha-MoC < 1-x > nanoparticles is 1.0-2.2 nm, and the alpha-MoC < 1-x > nanoparticles are highly dispersed in the SiO2 confinement structure; the alpha-MoC1-x nano-particles are face-centered cubic phase molybdenum carbide, and the mass fraction of the face-centered cubic phase molybdenum carbide is larger than or equal to 90 wt%. The alpha-MoC1-x / SiO2 obtained by the invention can realize higher methanol selectivity and intrinsic activity under the condition of 140-180 DEG C, and can stably operate for 100 hours. The invention provides a novel small-particle-size and high-dispersion molybdenum carbide catalytic material and a preparation strategy thereof for preparing methanol through low-temperature and high-selectivity CO2 hydrogenation.

The present invention discloses a non-thermal plasma treatment of metal powders in order to improve their processability by additive manufacturing (AM). The invention consists in bonding primary particles constituted of metals or metal alloys to a plurality of secondary particles constituted of metals, metal alloys, ceramics or polymers by the mean of a non-thermal plasma treatment. The primary particles have a larger mean diameter than the secondary. Both particles are injected through a non-thermal plasma glow discharge and / or in its afterglow region (region downstream the plasma discharge) where their surfaces are cleaned by removing contaminants and / or oxide layer and activated to react between each other. The functionalized metal powders are then collected and afterwards processed by AM leading to high quality parts. The functionalized metal powders produced by this plasma treatment improve the processability of metal by AM.

The invention provides amorphous nanocrystalline soft magnetic alloy powder, a preparation method thereof and a magnetic powder core, and relates to the technical field of soft magnetic materials. According to the preparation method of the amorphous nanocrystalline soft magnetic alloy powder, a high-energy electric pulse technology is adopted, an amorphous alloy material is instantly and rapidly heated and exploded, the particle size of the powder is accurately regulated and controlled by accurately regulating and controlling an energy input parameter and a spacing parameter, and the high-sphericity soft magnetic powder with the median particle size being 0.5-5 microns is prepared; the uniformity and dispersity of the powder are remarkably improved, and the problem of low particle size control precision in the prior art is solved. The preparation method is simple in technological process and low in energy consumption, impurities and defects introduced in a traditional multi-step technology are avoided, and the purity and performance of the material are improved. The prepared amorphous nanocrystalline soft magnetic alloy powder has the characteristics of small particle size, high sphericity, high saturation magnetization, low coercive force and high yield, and is particularly suitable for the fields of high-frequency magnetic elements and precision electronic devices.

The invention provides a gold mineral exploration method, device and system and a storage medium. Relates to the technical field of mineral exploration. The gold mineral exploration method comprises the following steps: acquiring a backscattered electron image of a sample to be detected, and screening bright mineral phase particles based on a preset gray threshold; performing energy spectrum analysis to obtain an actually measured energy spectrum corresponding to each bright mineral phase particle; and determining the gold-bearing minerals in the to-be-detected sample according to the actually measured energy spectrum. According to the method provided by the invention, the gold-bearing mineral is determined by analyzing the actually measured energy spectrum, and the identification accuracy and the automation efficiency of the micro-fine gold are improved; the method can effectively solve the problem of missed judgment caused by energy spectrum signal mixing and low matching degree due to fine or wrapped particles in a traditional method, so that more accurate process mineralogy data is obtained, and a reliable basis is provided for formulating an efficient dressing and smelting recovery scheme.

The utility model relates to the technical field of gas detection, in particular to a pulverized coal bunker CO gas analysis device which comprises a sampling probe (1), a cleaning structure is arranged on the sampling probe (1); the sampling probe (1) is connected with a detection module; the cleaning structure is used for removing smoke dust, impurities and condensates attached to the surface of the probe and components in the probe by applying reverse airflow into the sampling probe, so that the measurement accuracy is kept, the service life of equipment is prolonged, the maintenance workload is reduced, the sampling flow stability is ensured, and the system reliability is enhanced; the detection module can be used for removing water and possibly residual small particles in the sampled flue gas as well as tiny liquid drops or condensates possibly generated in the dehumidification process; the accurate detection of the CO gas concentration by the device can be effectively realized.

The invention discloses a small particle shape and granularity detection method based on an image. According to the method, an image device is combined with an object space telecentric lens to collect small particle images; performing target detection on the particles in the image by adopting an improved YOLOv9-CSA model to obtain a bounding box of the particles; inputting the bounding box as a prompt into the SAM2-PDA model, and generating an initial segmentation mask of the particles; for a particle aggregation scene, identifying and screening out single particle masks which are not shielded through a particle shape detection algorithm based on contour geometric features; and calculating the area and the equivalent circle diameter of the particles based on the screened masks, and finally obtaining accurate particle size distribution data such as D10, D50, D90, the average diameter and the total number of the particles. According to the method, through cooperative work of the constructed YOLOv9-CSA and SAM2-PDA and in combination with geometric feature particle screening, the precision and reliability of particle size analysis of the small particles are effectively improved, and an efficient and automatic solution is provided for industrial-grade particle size detection.

Provided is an aqueous inorganic coating agent capable of forming a coating film having high antifogging properties. [Solution] The aqueous inorganic coating agent comprises small-particle colloidal silica having an average particle diameter of 3 nm or more and 10 nm or less, large-particle colloidal silica having an average particle diameter of more than 10 nm and 100 nm or less, at least one of a sodium phosphate compound and a potassium phosphate compound, boric acid, and water.

The present disclosure provides an aquarium feed with slow-release function, and preparation method and uses thereof. Raw materials of the aquarium feed comprise granulated feeds with different particle sizes and slow-release binding agent; the granulated feeds with different particle sizes are bonded by the slow-release binding agent; the slow-release binding agent contains attractant and slow-release adhesive; and the slow-release adhesive is gel-like in water. The aquarium feed in the present disclosure can be slowly released into tiny particles with uneven size in water, allowing aquarium creatures with different body sizes or living in different water layers (comprising surface, middle and bottom layers) to find suitable food for themselves, thus improving the feed utilization rate and aquarium creatures' weight growth rate, and reducing difference of the body length.

The invention provides silver powder and a preparation method thereof, and belongs to the technical field of metal powder preparation. According to the method, the silver powder microstructure control agent and the small-particle silver powder oriented growth inducer are used in a combined mode, the pH value, the temperature and the adding mode of the reaction solution are cooperatively controlled, and the large-flake silver powder with the small-particle thick-flake silver powder growing in an oriented arrangement mode is obtained. An oxidizing agent solution and a reducing agent solution are added into a base solution at the same time, sodium citrate in the base solution controls generation of small-particle thick-sheet-shaped silver powder, an alkaline inducer can promote oriented growth of silver powder particles while adjusting the pH of the solution, then target silver powder is prepared, and on the other hand, in an alkaline reaction system, the prepared silver powder is high in sedimentation rate and high in stability. The solid-liquid separation effect is good, and the waste liquid treatment cost is low. Compared with dendritic or traditional single flaky silver powder, the flaky silver powder prepared through the method has the advantages that the sintering shrinkage rate of powder slurry is low, the contact effect between silver powder particles is better, the sintering activity and conductivity are good, and the market application prospect is good.

The present application relates to a kind of feeding protection system with feeding mixing function and its feeding method, including mobile platform, mobile platform is provided with the mixing mechanism for feeding mixing, mobile platform is also provided with airflow mill mechanism, mixing mechanism is connected with the air flow mill mechanism between discharging conduit, the present application overcomes the deficiencies of prior art, provide a kind of feeding protection system with feeding mixing function and its feeding method, when directly through pipeline between feeding mixing equipment and pulverizing equipment material conveying, it is extremely easy to cause the blockage of material, and cannot accurately control the amount of mixed material conveying to pulverize, it can cause material backlog and blockage, seriously affect the efficiency of production, while part of material is shorter in airflow mill and is not collided and pulverized into smaller particles when directly being discharged to carry out next step production, affect the quality of product problem.

This invention provides an amino-modified copper-silicon catalyst, its preparation method, and its application, belonging to the field of catalyst technology. The copper oxide particles in the copper-silicon catalyst provided by this invention have a small particle size and high dispersibility on the silica surface, which can significantly improve the catalytic activity of the copper-silicon catalyst, thereby improving the selectivity of ethanol in the hydrogenation of diethyl oxalate. Example results show that, at 180℃ and a hydrogen-to-ester ratio of 25, the copper-silicon catalyst provided by this invention achieves a diethyl oxalate conversion rate of 96.66% and an ethanol selectivity of 84.72% for diethyl oxalate. Furthermore, after 270 hours of stable reaction, the diethyl oxalate conversion rate still reaches 94.7%, and the ethanol selectivity still reaches 66.29%, indicating that the copper-silicon catalyst does not show significant deactivation.

This invention discloses a grain vibrating screening and conveying machine, belonging to the field of grain conveying technology. It includes a screening box with a bottom support frame at its bottom, a blower located above the right side wall of the screening box, a feed hopper on the right side of the top surface of the screening box, and several vibrating screening components arranged inside the screening box. Several discharge ports are arranged on the bottom surface of the screening box. This invention achieves one-time grading and screening of large, medium, and small particles, as well as impurities, by arranging multiple vibrating screening components along the long side of the screening box and coordinating with horizontal airflow from the blower. Simultaneously, by utilizing the decreasing diameter of the screen holes along the airflow direction on the screening plate, and the irregular vibration generated by the impact of grain and the rebound of the torsion springs, smaller grain particles can quickly fall from the screen holes into their respective screening zones, effectively avoiding mixing of grains of different sizes and greatly improving screening quality and efficiency.

The utility model discloses a high frequency vibrating screen device for zirconium titanium ore sorting relates to mineral processing field. A high frequency vibrating screen device for zirconium titanium ore sorting, including screening box, still include: a plurality of oblique settings screening board, from top to bottom equal interval staggered fixed connection in screening box, the both sides of screening box are opened in the symmetry and have the flow through cavity, the utility model discloses through the consistent screen hole design of multilayer screening board and high frequency vibration cooperation, has realized zirconium titanium ore material's efficient continuous screening, and small particle is fast and sieves when first contact screen surface, and large particle is repeatedly refined through multistage screening board, finally through first discharge port and second discharge port accurate separation, effectively improved the screening efficiency, and through continuously to the feed pipe conveying material, and the device can continuous operation, need not stop machine to take and put material, and the continuity of production is greatly improved, reduces manpower cost and equipment loss, especially suitable for the efficient production demand of large -scale zirconium titanium ore processing enterprise.

The utility model discloses a fly ash recycling stirring slurrying device which comprises a tank body, a sealing cover is fixed at the top of the tank body through bolts, a fly ash storage barrel is arranged at the top of the sealing cover, a plurality of material guide pipes are fixed and communicated with the bottom of the fly ash storage barrel, the material guide pipes penetrate through the sealing cover and are fixed with the sealing cover, and the material guide pipes are communicated with the tank body. When fly ash is screened on the bucket-shaped sieve, small-particle fly ash is filtered by the bucket-shaped sieve and then thrown into water in the tank body, the fly ash falls into the water in the form of dispersed powder or fine powder flow, and the powder does not act collectively any more, but takes a single particle or a very tiny particle cluster as a unit. When the fly ash is mixed with water, the fly ash almost falls off or is scattered into the water, so that the production of false aggregates is avoided, the fly ash can be more fully mixed with the water, and the stirring time is shortened and the pulping efficiency is improved due to the fact that no false aggregates exist.

The application provides a double-face milling device for processing automobile accessories, and relates to the technical field of automobile accessory processing. The device comprises a workbench fixing base, a double-direction milling device, a workbench main body and an accessory clamping device. The double-direction milling device is installed on both sides of the workbench fixing base. The workbench main body is movably installed on the top of the workbench fixing base. The accessory clamping device is movably installed on the top of the workbench main body. The device collects the milling debris, uses a processing waste recycling device to reduce the scattering range of the debris, and achieves the purpose of centralized collection of the processing debris. The device uses the staggered rotation of multiple extrusion discs at different positions to compress and crush the collected debris and waste. Compared with a common solid crushing cylinder, the overall mass of the device is lighter. The device can extrude and crush the waste into smaller particles in a short time, so that the waste storage box can accommodate more waste.

This invention relates to the field of lepidolite calcination technology, and particularly to a high-temperature calcination process and apparatus for lepidolite based on tail gas purification. The apparatus includes a calcination kiln body, and a feed hopper and a discharge cylinder rotatably connected to both ends of the kiln body. The kiln body is equipped with a conveying and screening mechanism for graded calcination of lepidolite, and a recovery and purification mechanism for multi-stage treatment of calcination tail gas is located on one side of the kiln body. This invention achieves graded conveying and processing of lepidolite through the counter-rotation of the kiln body and the rotating cylinder, controlling the transit time of lepidolite within the kiln body. This avoids the phenomenon of some lepidolite being discharged too slowly or too quickly, leading to local over-calcination or incomplete calcination. The graded screening calcination process for lepidolite allows small lepidolite particles to be retained by the screening mesh, delaying discharge and extending the calcination interval, creating a difference in calcination time between small and large lepidolite particles. This effectively avoids the problems of over-calcination of small particles and incomplete calcination of large particles.

The application discloses a dust collector with dust compression function and relates to the technical field of dust removal equipment. The dust collector comprises a collector main body, a wind collecting pipe fixedly connected and communicated with the outer wall of the collector main body, a connecting flange fixedly connected with the top of the wind collecting pipe, a connecting box fixedly connected with the bottom outer wall of the collector main body, a bottom box fixedly connected with the bottom outer wall of the connecting box and an ionization dust removal device arranged in the collector main body. The ionization dust removal device is arranged to collect the dust not completely collected in the collector main body. The wind mixed with the dust enters the collector main body through the wind collecting pipe, the small-particle dust is floated to the air deflector along the airflow and is limited in the ionization plate to be charged with the same electric charge, the dust is adsorbed through the opposite-charge adsorption plate, the dust falls after power-off after use, the dust is prevented from escaping outside the device body, and the collection effect is improved.

The invention discloses a method for industrially producing a micro-particle conductive aggregate. The method comprises the following steps: pretreating glass beads to obtain a micron-sized rough surface; preparing conductive paste containing large-particle graphene and water-based acrylic resin; at least three continuous spraying fluidized beds which are connected in series are adopted, and the surfaces of the microbeads are coated with bonding layers, conductive layers and protective layers in sequence; and finally, continuous curing and screening are carried out. According to the method, efficient, continuous and large-scale production of the conductive aggregate is achieved, and the problems that graphene is prone to agglomeration and uneven in dispersion and the coating binding force of a traditional process is poor are effectively solved. The obtained conductive aggregate is excellent in conductivity, good in solvent resistance, high in adhesive force and suitable for the fields of anti-static mortar, resin self-leveling materials, coatings and the like.

An organopolysiloxane that is represented by formula (1), has a small particle size of a water-in-oil emulsion, has a narrow distribution width, and is excellent in the production of a water-in-oil emulsion having excellent stability over time. [In the formula, R1 are each independently a group selected from C1-20 alkyl groups, C6-20 aryl groups, and C7-20 aralkyl groups.　R2 are each independently a group selected from formulae (2)-(7) (where x4 is an integer of 3-10; y1 is the average of the degrees of polymerization of glycerol groups and is 1-5; and the proportion of groups having the degree of polymerization with the highest content among the glycerol group degrees of polymerization 1-5 to all groups represented by (6) is 90% or more).]

The utility model discloses a historical building outer wall grey sculpture repairing and toning preparation device, which belongs to the technical field of toning preparation and is technically characterized by comprising a main body assembly, a crushing assembly, a stirring assembly and a filtering assembly. According to the pigment preparation device, when pigment preparation is carried out, large pigment blocks can be firstly placed in the crushing assembly, the large pigment blocks can be ground by operating the crushing assembly, so that the large pigment blocks are crushed into small particles, and after crushing is completed, various pigment blocks can be stirred and mixed through the stirring assembly; after mixing, pigment particles can be filtered through the filtering assembly, so that pigment blocks still containing large particles are avoided, and the pigment blocks can be taken out for use after being filtered.

The application discloses an online detection and metering method applied to a coal washing system, and comprises the following steps: conveying raw coal in a coal receiving machine to a sizing screen, detecting the particle size of the oversize and undersize of the sizing screen, and sending an alarm information of sizing screen abnormality when the particle size of the undersize is uneven; carrying out crushing detection on the oversize, selecting large raw coal after crushing for secondary crushing, and sending an alarm information of crusher abnormality when the raw coal needing secondary crushing exceeds a preset range; conveying the raw coal after secondary crushing and the undersize to a coal washer for classification to obtain gangue and medium coal; carrying out secondary screening on the medium coal through a jig to obtain fine coal with a smaller particle size, and when the particle size of the fine coal after secondary screening does not meet a preset requirement, the coal after secondary screening is put into the jig for tertiary screening, and when the fine coal after tertiary screening still does not meet the preset requirement, an alarm information of jig abnormality is sent; and metering the fine coal meeting the preset requirement.