791 results about "Large particle" patented technology

The invention provides a Raney nickel electrode preparation method which comprises the following steps: 1, taking nickel powder with the particle size of 15-75 microns, nickel powder with the particle size of 75-150 microns and aluminum powder with the particle size of 15-75 microns, pouring the nickel powder, the nickel powder and the aluminum powder into a mixer, uniformly mixing without segregation phenomenon, and enabling the nickel powder, the nickel powder and the aluminum powder to respectively account for 70%-79%, 1%-10% and 20%; secondly, a plasma spraying technology is adopted, the temperature is regulated and controlled, so that the nickel powder and the aluminum powder with the particle size being 15-75 micrometers reach a molten state, and the nickel powder with the particle size being 75-150 micrometers reach a semi-molten state; spraying to a nickel net, and activating, cleaning and cutting to obtain a Raney nickel electrode; the nickel powder and the aluminum powder with different particle sizes are reasonably matched in the powder formula, the particle flying speed in spraying is properly increased, the spraying temperature is balanced, the powder with different particle sizes reaches different molten states, and therefore the large-particle nickel powder forms a good support in the coating, the bonding strength of the coating is remarkably improved, and the service life of the coating is prolonged. And the catalyst is not easy to fall off in the use process, so that the efficiency and the stability of the water electrolysis hydrogen production equipment are improved.

The invention discloses a large-particle pneumatic conveying pipeline optimal wind speed calculation method based on digital twinning and machine learning, and the method comprises the steps: S1, carrying out the digital twinning modeling of a gas fluid region and large-volume particles, including an overall pipeline fluid model, fluid region grid division, a large-particle model, and a large-particle transportation volume fraction algorithm; s2, a gas-solid coupling numerical simulation experiment is carried out to calculate simulation data, and the optimal conveying wind speed for conveying spherical particles with different volumes and masses is obtained; and S3, fitting simulation data by adopting multiple linear regression analysis in machine learning, establishing a pipeline optimal wind speed calculation model, and determining a high-order term order of an independent variable. According to the method, digital twinborn modeling is conducted on the pneumatic conveying pipeline and the large-size particles, the optimal conveying wind speed for conveying the spherical particles of different sizes and masses is obtained through a gas-solid coupling numerical simulation experiment, and it is avoided that data are obtained through complex, tedious and even difficult-to-execute actual experiments.

The invention relates to the technical field of sediment particle size detection, in particular to a river sediment particle size detection device which comprises a main body plate, a centrifugal partition mechanism enabling particles in a solution to be classified according to the size of the particle size is arranged in the main body plate, and the centrifugal partition mechanism comprises a first empty groove formed in the upper end of the main body plate; a supporting plate is rotationally matched in the first empty groove, a rotating body is arranged at the upper end of the supporting plate, the upper end of the rotating body is of an opening structure, a containing shell is arranged in the rotating body in a matched mode, the containing shell is of a transparent structure, and a bubble removing mechanism for removing bubbles through pressure reduction and ultrasonic waves is arranged at the lower end of the main body plate. A detection mechanism for detecting various particle sizes in a solution is arranged at the upper end of the main body plate; under the action of centrifugal force, particles with different particle sizes enter different adjacent baffle rings, meanwhile, under the shaking of the bubble removing mechanism, it can be guaranteed that particles with small particle size differences are evenly laid in the baffle rings, and the situation that small particles are blocked by large particles is prevented.

The invention relates to the field of multiphase numerical simulation, and discloses a large-scale particle flow numerical calculation method based on multi-ball filling, and the method comprises the steps: obtaining a fluid domain grid size, a fluid density and a large particle radius; calculating the radius of the small filling ball according to the size of the fluid domain grid; based on golden angle spiral distribution and minimum distance coverage judgment, determining the number and the positions of small filling balls, and generating a large particle model of multi-ball filling; obtaining the background flow field speed of the large particles and the filling small balls in the current time step, and calculating the background flow field speed and drag force of the large particles; updating through iterative calculation to obtain the speed and the position of the large particles and the small filling balls in the next time step; and adding drag force as a source item into a momentum equation to solve fluid motion, and obtaining a fluid computational domain grid speed in the next time step. Accurate numerical simulation of large-scale particles is realized.

The invention provides a rapid detection method for water pollutants, which comprises the following steps: removing large-particle impurities and suspended solids in a water sample to be detected to obtain a target water sample; the method comprises the following steps: synchronously detecting multiple pollutant indexes of a target water sample through a multi-source sensor array to generate an initial detection data set; performing noise filtering and baseline correction on the initial detection data set to generate a target detection data set; performing space-time dimension dynamic fusion and feature decoupling on the target detection data set to generate water quality pollutant data and dynamic risk assessment indexes; and constructing a multi-dimensional risk assessment report by adopting the water quality pollutant data and the dynamic risk assessment indexes. By adopting a dynamic gradient filtering technology, impurity interference is effectively removed, dynamic risk assessment of a time dimension is realized, the accuracy and reliability of detection in a complex water quality environment are remarkably improved, and rapid and accurate water quality pollutant detection and risk assessment are realized.

The invention relates to the technical field of jet milling, in particular to a jet milling control method for a fluidized bed jet mill. The method comprises the following steps: acquiring the scattered particle weight increment of large particles and the fine weight increment of fine particles between adjacent sampling moments; dividing into an initial increasing stage and a uniform increasing stage according to the numerical value change of the weight increment of the scattered particles at the maximum value position; in the initial increasing stage, the retention degree is determined according to the trend change of the small weight increment; the drag force degree is determined according to the numerical comparison of the fine weight increment and the granular weight increment in the initial increasing stage and the uniform increasing stage; and determining an adjustment coefficient of the jet milling pressure by combining the retention degree and the drag force degree at the current moment, and regulating and controlling the jet milling pressure at the current moment according to the adjustment coefficient. The airflow crushing pressure can be adjusted and controlled more objectively and reasonably, and the airflow crushing efficiency is effectively improved.

The invention provides an optimization method of a magnesium slag sensible heat recovery system, which comprises the following steps: acquiring particle size distribution data of magnesium slag particles, and judging whether the problem of non-uniform particle size distribution exists or not according to a preset particle size threshold value; aiming at the problem of non-uniform particle size distribution, magnesium slag particles are classified by adopting a clustering algorithm, and the distribution areas of large particles and small particles are determined; according to the distribution area of the large particles, the rotating speed of the cooling roller is dynamically adjusted, and the accumulation probability of the large particles in the roller is reduced; the temperature change trend of the inner wall of the cooling roller is monitored in real time, and if it is detected that the local temperature abnormally rises, it is judged that local hot spots exist; when a local hot spot is detected, a spraying cooling system in the roller is started, and intensified cooling is conducted on a local area; pressure and temperature data of high-pressure and high-temperature water are collected in real time through a pressure sensor and a temperature sensor, and whether fluctuation exists or not is judged.

The invention discloses an impact-resistant and wear-resistant gate valve which comprises a main body assembly, a filtering assembly and an air compression assembly. The main body assembly is used for sealing and assembling the whole gate valve, the stability of the whole gate valve is guaranteed, the filtering assembly is used for blocking and filtering large-particle impurities in liquid flowing through the interior of a pipeline, and the air compression assembly is used for storing continuous pressure on the stamping plate to a certain degree. Through the stamping plate, the filtering holes formed in the stamping plate can accurately filter large-particle impurities in liquid flowing through the pipeline. In the liquid flowing process, large-particle impurities are blocked on one side by the stamping plate and cannot enter a deeper structure in the gate valve. The filtering process effectively protects a sealing piece, a valve element, a valve plate and other key components in the gate valve, component abrasion caused by friction and scraping of large-particle impurities is avoided, and therefore the precision and the sealing performance of the components are guaranteed.

The invention discloses a grinding device and method for producing an anti-collapse agent for drilling fluid, and relates to the technical field of grinding devices. By arranging the anti-collapse agent grinding mechanism, when anti-collapse agent raw materials are ground, large anti-collapse agent particles can be ground through a coarse grinding roller firstly, and then fine anti-collapse agent particles subjected to preliminary grinding are ground again through a fine grinding roller; according to the grinding mode, the situation that an energy-saving motor is overloaded and damaged due to the fact that the large-particle anti-collapse agent is clamped between the grinding plate and the grinding roller is avoided, the coarse grinding roller can rapidly crush the large-particle anti-collapse agent, and therefore grinding and crushing operation of the fine grinding roller is more convenient, the grinding and forming speed of the anti-collapse agent can be increased, and the quality of the anti-collapse agent is improved. And the material distribution assembly can release anti-collapse agent raw materials at a constant speed through an auger, the situation that the anti-collapse agent raw materials are accumulated on the grinding plate in a concentrated mode, and consequently the anti-collapse agent cannot be evenly ground is avoided, and the grinding and crushing speed of the anti-collapse agent is increased.

The invention relates to the technical field of feed processing, and provides a grain grinding device for feed production, the grain grinding device comprises a shell, a feed inlet and a discharge outlet, the feed inlet is fixedly communicated with the top of the shell, the discharge outlet is fixedly communicated with the bottom of the side wall of the shell, a grinding assembly is arranged at the top of the inner wall of the shell, and a screen is arranged at the bottom of the grinding assembly; the screen is obliquely and fixedly connected to the inner side wall of the shell, an ejection mechanism is arranged at the bottom of the inner wall of the shell, a circulating inlet and a circulating outlet are formed in the side wall of the shell, and a circulating conveying assembly is arranged on the outer wall of the shell. The ejection mechanism is arranged and comprises a plurality of ejection rods in one-to-one correspondence with the holes of the screen, the ejection rods penetrate through the holes to eject large particles clamped in the holes, the screen is prevented from being blocked, qualified particles can be conveniently output out of the grinding device through the holes of the screen, and the qualified particles are prevented from being conveyed back to the grinding assembly to be ground again; the probability that unqualified particles make contact with the grinding groove and the grinding pestle is increased, and the grinding efficiency is improved.

The utility model discloses a device for sorting copper and aluminum particles after crushing of waste lithium batteries, which is provided with a vibrating screen (1), and a material inlet at the upper part of the vibrating screen (1) receives materials generated by a crusher; the sorting device is also provided with a large particle sorting machine (4) and a small particle sorting machine (6); and a large particle outlet and a small particle outlet of the vibrating screen (1) are respectively connected with the large particle sorting machine (4) and the small particle sorting machine (6) through the conveying pipeline (3). By the adoption of the technical scheme, the copper-aluminum mixture generated in the waste lithium battery crushing and sorting process can be efficiently sorted, high-purity copper particles and aluminum particles are obtained, and recycling of waste materials is achieved; the process is reasonable and feasible, equipment is simple, and recovery cost is low.

The invention discloses a crushing device and an energy-saving crushing method for feed fine processing, and relates to the field of crushing devices.The crushing device comprises a rotating cylinder and a filter sieve, the filter sieve is hollow and cylindrical, a plurality of filter holes are formed in the filter sieve, the rotating cylinder can rotate in the filter sieve, and an operation assembly and a plurality of hammering assemblies are arranged in the rotating cylinder; the operation assembly comprises an operation rod, the operation rod is rotationally connected into the rotating cylinder, the hammering assembly comprises a hammering head, and the rotating cylinder can drive the hammering head to rotate. The distance between the hammering head and the filter sieve is matched with the diameter of a material, so that particle materials with different diameters are well crushed, large particle materials are ensured to have sufficient space to jump and participate in collision, the crushing efficiency is improved, the large particle materials cannot block small particle materials in the filter sieve from being discharged through filter holes, and the service life of the filter sieve is prolonged. The crushing and discharging efficiency is improved, excessive crushing caused by the fact that small-particle materials cannot be discharged in time is prevented, and the quality of the crushed materials is improved.

The invention provides an arc-shaped deterministic lateral displacement chip and an application method thereof, and the chip comprises a target curve flow channel which is a curve with the curvature greater than 0 and is bent towards a single side; the barrier column array is arranged in the target curve flow channel; the obstacle column array comprises a plurality of obstacle columns which are arranged in order, and when a particle solution flows through the obstacle column array, the advancing routes of particles with different sizes are different. According to the scheme, the obstacle column array formed by the multiple obstacle columns which are arranged in order is arranged in the target curve flow channel with the curvature larger than 0 and bent towards the single side, so that the length of the flow channel is shortened under the condition that the particle sorting precision is not lost, and the area occupied by the flow channel is reduced. In addition, the arc-shaped deterministic lateral displacement chip provided by the specification can be used for efficiently sorting sticky particles, and can be used for accurately sorting larger particles in a particle solution with impurities and filtering the impurities at the same time.

An efficient smelting device for metal material manufacturing relates to the technical field of metal smelting furnaces, and is characterized in that when a feeding bin is used for feeding, materials are filtered by using an internal screen, so that the materials with smaller granularity in the metal materials preferentially enter a furnace body, and the materials with larger granularity are retained on the screen in the feeding bin; along with the increase of the feeding amount of metal materials in the furnace body and the increase of the self weight of the furnace body, the furnace body and the furnace frame are driven to integrally move downwards under the action of gravity, the furnace frame moves downwards to drive the connecting rod to move downwards, the connecting rod drives the transmission gear and the transmission shaft to rotate and pushes the supporting semi-ring to drive the screen to move, and a gap is formed between the screen and the side wall of the feeding bin. Metal with large granularity on the screen can fall down from the gap to be fed, feeding of the furnace body is controlled through the change of the feeding self weight of the furnace body, metal materials with small granularity firstly enter the furnace body, the metal materials with large granularity are buffered through the metal materials with small granularity, and the impact force of the metal materials with large granularity on the furnace body is reduced.

The invention discloses a preparation method of a crack-free multi-element positive electrode material precursor. The preparation method comprises the following steps: step S1, a seed crystal preparation stage; and S2, a growth stage. At present, the (010) crystal face of a conventional ternary material precursor is basically outward, and one of the problems existing in large particles in the later growth period is a crack problem. A special process is adopted in the later stage of production, the (003) crystal face appears on the surface of a large particle, the crack problem caused by the stress problem existing in excessive (010) crystal faces is reduced, the appearing (003) crystal face occupies crack points, and therefore cracks are reduced.

The invention relates to the technical field of ceramic product production and manufacturing equipment and a preparation process, in particular to a spray granulation process which comprises the following steps: preparing zirconium oxide slurry with the solid content of 90%, conveying the zirconium oxide slurry to a nozzle through a pipeline, and enabling the slurry to meet airflow at the nozzle and be atomized into tiny liquid drops; atomized liquid drops make contact with hot airflow for drying, the airflow temperature is controlled by a temperature control system to gradually rise from the inlet section to the outlet section of the main tower, and an airflow system adjusts the airflow speed and the airflow direction; the particles with the particle size larger than or equal to 40 micrometers fall to a discharging port in the bottom of the main tower under the action of strong airflow, and the particle size is lt; particles with the particle size of 40 microns flow to a brown air opening under the action of relatively weak air flow; the dried large particles are guided out from a discharge hole in the bottom of the main tower through a strong airflow regulator to be collected, and the dried small particles are collected through a connecting pipeline and a cyclone separator through an air inlet; the large particles are directly stored or subsequently processed, and the small particles are further processed or sub-packaged. Precise classified collection is achieved, and the granulation quality and the production efficiency are improved.

Disclosed is a positive electrode material for a high-power lithium ion battery. The positive electrode material is in form of secondary particles with a hollow microsphere structure, and a shell of the secondary particles is formed by aggregating a plurality of primary particles. The secondary particles have a uniform particle size, a loose and porous surface, and a large specific surface area. The obtained particles are regular in shape, stable in material structure, so that the positive electrode material has high rate performance and excellent cycle performance. The disclosure also provides a preparation method for the positive electrode material comprising (1) synthesizing a NixCoyMz(OH)2 precursor by a co-precipitation method, such that the precursor has a central portion consisted by fine particles and a shell portion consisted by large particles having a larger particle size than that of the fine particles; (2) mixing the precursor and a lithium salt uniformly, and adding an oxide of a doping element during the mixing, and then sintering the mixture to provide a LiaNixCoyMzO2 positive electrode material. The preparation method is simple and low cost, and can be industrialized.

The invention belongs to the technical field of high-temperature alloy precision casting, and particularly relates to a high-porosity ceramic crucible with a large-particle skeleton structure and a preparation method. According to the method, a traditional crucible forming method is abandoned, a framework made of a large-particle material is firstly constructed, then gaps between the frameworks are accurately filled with a specific filling material, and therefore forming of the crucible is completed. Wherein the framework material comprises the following raw materials in parts by weight: 50-65 parts of 3-5mm white corundum, 30-45 parts of 1-3mm white corundum, 3-4.5 parts of gel powder, 0.5-2 parts of high-alumina cement and 5-8 parts of additional water; the filling material comprises the following raw materials in parts by weight: 20-45 parts of 0-120-mesh white corundum, 25-35 parts of alpha-alumina powder, 30-40 parts of silica sol and 0.5-1 part of an external surfactant. The basic strength of the crucible is stabilized, and the thermal shock resistance of the crucible is remarkably enhanced by optimizing the internal pore structure of the crucible.

The invention discloses a cement dosage detection method for oversized-particle-size cement stabilized macadam, which is characterized in that on one hand, the cement stabilized macadam passes through a 4.75 mm sieve to avoid coarse and fine segregation and poor representativeness of a sample, so that the aim of rapidly and accurately testing the cement dosage of the cement stabilized macadam is fulfilled, and on the other hand, an EDTA (Ethylene Diamine Tetraacetic Acid) titration method nomogram drawn by a temperature influence factor is considered; and the cement dosage of the cement stabilized macadam can be accurately judged.

A mask repairing method comprises the steps that a mask is provided, the mask comprises a light-transmitting substrate and a light shielding layer, and the light shielding layer is located on the top of the light-transmitting substrate and exposes part of the surface of the light-transmitting substrate; particle defect detection is carried out on the mask; under the condition that the defect of the particulate matter is detected, a deposition layer is formed on the particulate matter, and the deposition layer and the particulate matter serve as a particulate matter structure; and removing the particulate matter structure through a cleaning process. The deposition layer is formed on the particulate matter defect, and the vertical height and the volume of the particulate matter structure are increased, so that the effect that the particulate matter structure is infiltrated by the cleaning solution is improved, the particulate matter structure is easy to remove in a cleaning mode, the removal effect on the particulate matter defect is correspondingly improved, and the quality of the mask plate is improved.

The invention discloses an oscillation microbubble chip, a separation system and an acoustic manipulation method, the device utilizes the acoustic eddy current effect induced by oscillation microbubbles to realize micro-nano particle acoustic manipulation, the chip structure and operation are simple, the biocompatibility is high, and by designing the chip structure, due to the breathable and water-repellent characteristics of PDMS and the surface tension of fluid, the micro-nano particle acoustic manipulation can be realized. Alternatively arranged equilateral triangle column cavities with different sizes are formed on the side wall of the PDMS microfluidic channel to anchor bubbles. Bubble oscillation is driven by bulk acoustic waves generated by exciting a piezoelectric transducer through a signal generator, symmetrical vortexes are formed on the surfaces of the bubbles through secondary acoustic radiation force generated by bubble oscillation, then large-size particles are captured, and small-size particles flow to an outlet along with flowing under the action of drag force. Gradient separation is adopted to separate small particles from a mixed solution and enrich large particles, enrichment, separation and other control of microparticles are achieved through the acoustic vortex field effect of a specific structure, great potential is achieved in biological research, the structure is simple, the equipment cost is low, and integration is easy.

The invention relates to the field of debris flow disaster prevention and control, in particular to a method for predicting the flow of large-particle blocking and collapsing debris flow at the sudden shrinkage position of a channel, which comprises the following steps: determining the stress state information of large-particle materials according to the movement process of the large-particle materials in the channel along with debris flow; according to the stress state information and the stress balance condition, a flow prediction model of the large-particle blocking and collapsing debris flow at the channel sudden shrinkage position is constructed; building an experimental device, and placing a simulated large-particle material in the experimental device; obtaining debris flow characteristic parameters and large particle material motion characteristic parameters through an experimental device; and measuring the real channel to obtain a large particle material form parameter and a channel form parameter, so as to obtain the flow of the large particle blocking and collapsing debris flow at the channel sudden shrinkage part of the real channel. The experiment device is built to simulate the debris flow process for multiple times to obtain corresponding parameters, the debris flow is calculated in combination with the debris flow prediction model, and the debris flow prediction reliability is improved.

The invention provides powder coating equipment and a treatment method thereof. The powder coating equipment comprises a smashing assembly, a separation box, an auxiliary feeding assembly and a fan assembly. The discharging end of the smashing assembly communicates with the separating box, a large particle falling opening and a powder falling opening are formed in the left side and the right side of the lower surface of the separating box correspondingly, the other end of the large particle falling opening communicates with the feeding end of the auxiliary feeding assembly through a pipeline, and a filtering assembly is installed between the large particle falling opening and the inner wall of the separating box. The other end of the auxiliary feeding assembly communicates with the feeding end of the smashing assembly. A controllable vibration sliding plate and a filtering layer net are additionally arranged at a large particle falling opening, meanwhile, a third motor drives the filtering layer net to vibrate, recycled particles are automatically conveyed into an auxiliary feeding assembly in a sliding mode, smooth conveying of large particle powder is guaranteed, secondary screening and smashing are not needed, and the quality of powder coating is improved; and the powder coating has good adhesive force.

The invention belongs to the technical field of powder materials, and provides a method for improving the mixing uniformity of tungsten powder and element powder, and the method comprises the following steps: mixing the tungsten powder and the element powder, carrying out ball milling, and then carrying out ultrasonic cleaning to obtain first powder; sequentially carrying out three-dimensional mixing and ultrasonic cleaning on the first powder to obtain second powder; the second powder is subjected to double-cone mixing, and treatment is completed. Tungsten powder and element powder are mixed and then subjected to ball milling, different powder bodies are dispersed, and large particles are prevented from being agglomerated. Then, the mixed powder is cleaned in an ultrasonic cleaning mode, and a uniformly mixed system is obtained under the ultrasonic effect; under the action of three-dimensional mixing, mixed materials are accelerated to flow and diffuse, and agglomeration and accumulation caused by conventional mixing are avoided; and finally, under the action of double-cone mixing, the powder performs turbulent flow movement in the machine, and the materials are efficiently and uniformly mixed through complex impact, so that the tungsten powder and the element powder are mixed.

The utility model relates to an automatic weighing machine, which solves the problem of low efficiency during weighing of precious metals in the prior art. Comprising a shell, an electronic scale, a first feeding mechanism, a first feeding slide way, a second feeding mechanism, a second feeding slide way, a third feeding mechanism, a third feeding slide way and a cutter mechanism, and a storage barrel is arranged on a scale pan of the electronic scale. The automatic weighing machine is provided with the three feeding mechanisms, the first feeding mechanism can supply large-particle materials, the second feeding mechanism can supply small-particle materials, the rotating disc on the third feeding mechanism is wound with linear materials, the linear materials are conveyed through the feeding roller set, the cutter mechanism cuts off the linear materials, and the automatic weighing machine is convenient to use. In the weighing process, the large-particle materials and the small-particle materials are subjected to weight balancing to be close to the preset weight, then the linear materials are discharged and subjected to weight balancing compensation, the final weight balancing requirement is met, and therefore automatic weighing is achieved, weighing is accurate, and efficiency is high.

The application provides a low-crystallinity hydroxyapatite microsphere for implantation and a preparation method thereof, and the preparation method comprises the following steps: preparing a mixed solution of a calcium source reagent and a phosphorus source reagent, adding inorganic acid, alkali and a buffer into the mixed solution, adding a surfactant, and obtaining a hydroxyapatite micro-particle precipitate through constant-temperature reaction; cleaning the hydroxyapatite micro-particle precipitate, and preparing a hydroxyapatite micro-particle suspension by adding water; and performing spray drying on the hydroxyapatite micro-particle suspension to obtain the hydroxyapatite microsphere; wherein the surfactant is one or more of PEG and PVP. The hydroxyapatite microsphere obtained by the application has stable structure, belongs to spherical large particles, is easy to inject, and is not prone to agglomeration; when the hydroxyapatite microsphere is injected into a human body, the hydroxyapatite microsphere has good supporting effect; and the preparation method of the application is simple, has few process steps, and is easy to realize reaction conditions, and is suitable for large-scale production.

The invention provides an atmospheric environment monitoring system and method. The method comprises the following steps: measuring the concentration of small particles in each detection period through an oscillating balance; determining the local difference degree of the small particle concentration change information entropy at each moment in the atmosphere based on the concentration of all the small particles, and determining the sudden change moment when the small particles are agglomerated based on all the local difference degrees; determining the concentration of large particles in each detection period through an oscillating balance; determining a positive trend and a negative trend of the change of the concentration of the large particles in the atmosphere based on the concentration of all the large particles, and determining a sudden change moment when the large particles are subjected to temperature inversion settlement based on the positive trend and the negative trend; and according to the sudden change moment when the small particles are agglomerated and the sudden change moment when the large particles are subjected to temperature reversal sedimentation, determining the starting moment when the concentration of the particulate matters in the atmosphere is subjected to the upside-down abnormity. By adopting the scheme of the invention, the starting moment of the upside-down phenomenon can be detected, so that the upside-down phenomenon can be handled in time, and the accuracy of environment monitoring is improved.

Provided is an image forming apparatus including a photosensitive drum and an intermediate transfer member, in which when an area of particles on a surface of the photosensitive drum is denoted by S1 and an area other than the particles is denoted by S2, S1 / (S1+S2) is at least 0.70 and not more than 1.00, and in a particle size distribution of the particles, when a particle size of a peak top having a larger particle size value between a first peak having the maximum frequency and a second peak having the second highest frequency among peaks having a particle size of 20 nm or more at a peak top is denoted by DA and an arithmetic mean curvature of peak points in a surface roughness shape of the intermediate transfer member is denoted by Spc, 80 nm≤DA≤2×(1 / Spc) is satisfied.

The invention discloses multi-stage screening and conveying equipment, and relates to the technical field of screening equipment. Comprising a screening shell, a screening mechanism used for conveying materials is arranged on the screening shell, the screening mechanism comprises an adjusting assembly, the adjusting assembly comprises two sets of supporting shafts connected in the screening shell in a penetrating mode, the outer walls of the supporting shafts are rotationally connected with sliding rail supports, and first screening nets connected through locking assemblies are arranged in the sliding rail supports; after entering the screening shell, materials are primarily screened through the first screening net, large particles or impurities are removed, then the materials fall into the second screening net to be screened more finely, particles with different particle sizes are further separated out, and the screening efficiency can be remarkably improved through the classified screening mode; the materials are classified more accurately according to the particle size, it is ensured that the screened materials meet the specification requirement, and the multi-stage screening conveying equipment can meet the screening requirements of the materials of different types and properties.

The utility model discloses an automatic sorting device for screening and sorting brown sugar particles. Brown sugar particles entering from the feeding port of the screening box body can be screened and classified through the vibrating screen, large particles can be left on the first screen mesh of the vibrating screen, small and medium particles fall onto the second screen mesh after passing through the first screen mesh, and small particles fall onto the second screen mesh after passing through the second screen mesh. Medium particles roll down from the inclined second screen mesh, large particles roll down from the first screen mesh fall onto one discharge hopper group under the action of the two discharge hopper groups, and after being guided out, the large particles are conveyed by the material conveying mechanism to be conveyed into the discharge hopper group. According to the automatic screening and sorting device, large particles are conveyed into the smashing assembly to be smashed and then enter the screening box body to be screened, the practicability of the automatic screening and sorting device is improved, large particles which do not meet the standard can be sorted out, smashed and then screened, small particles and medium particles which meet the standard are sorted out, and the screening efficiency is improved. And the sorting efficiency is also improved.