70 results about "Large aggregate" patented technology

The invention discloses a biomass charcoal-based composite saline-alkali soil modifier which is obtained by mixing biomass charcoal and a glomalin extracting solution, oscillating, drying in the shade, and fully and uniformly mixing with monopotassium phosphate, potassium nitrate, potassium humate, algal polysaccharides and starch modified bentonite according to a formula. According to the modifier disclosed by the invention, after the glomalin is loaded on the biomass charcoal, under the supporting action of a carbon skeleton, the glomalin is used as an organic cementing substance for expanding a space, so that the soil agglomeration process is accelerated, the proportion of large aggregates is remarkably increased, and meanwhile, a positive promoting effect on the growth of a soil root system is achieved; the soil structure of a plough layer is improved, saline-alkali obstacles are reduced, and particularly the corn yield increasing effect is remarkable. In addition, the glomalin is loaded on the biomass charcoal, so that the degradation or loss of the glomalin is reduced, the glomalin can be slowly released and synergized under the action of microorganisms, and the application efficiency of the glomalin is improved.

The invention relates to the technical field of soil conditioning, and particularly discloses a soil conditioner and a preparation method and application thereof.The soil conditioner is prepared from, by weight, 160-200 parts of volcanic ash modified biochar, 50-70 parts of straw leavening and 50-70 parts of animal dung; the volcanic ash modified biochar is obtained by mixing volcanic slag and crop straw according to a mass ratio of 1: (4-5) and then carrying out carbonization reaction at 450-650 DEG C. According to the soil conditioner provided by the invention, the content of organic matters in black soil is increased, the content of water-stable large aggregates in the soil is increased, and the effects of recarburizing and improving the soil are achieved.

The invention provides a construction method of a concrete chloride ion diffusion coefficient model, which comprises the following steps: S1, acquiring a mix proportion of concrete, and acquiring a chloride ion diffusion coefficient of concrete mortar prepared according to the mix proportion; s2, building a two-dimensional three-phase geometric model of the concrete by utilizing finite element software based on the mix proportion; and S3, based on the constructed two-dimensional three-phase geometric model, establishing a chloride ion diffusion coefficient model. According to the method, the influence of large aggregate distribution is considered, concrete erosion can be simulated more accurately, and reliable technical support is provided for durability of large-particle-size aggregate concrete engineering.

The invention relates to a graphene oxide modified cement-based grouting material as well as a preparation method and application thereof. The graphene oxide modified cement-based grouting material is prepared from cement, graphene oxide, silica fume, a polycarboxylate superplasticizer, an accelerator and water. The invention also provides a preparation method of the graphene oxide modified cement-based grouting material, which comprises the following steps: adding GO into an aqueous solution containing a polycarboxylic acid water reducer, stirring and then carrying out ultrasonic treatment to form a GO suspension; premixing silica fume and cement to obtain a dry mixture; and adding the GO suspension into the dry mixture, mixing and stirring, and then doping an accelerator to obtain the graphene oxide modified cement-based grouting material. The invention further provides application of the graphene oxide modified cement-based grouting material as a reinforcement treatment material for loose accumulation bodies and broken rock stratums. The GO modified grouting material solves the problem that the performance of a cement-based material is affected due to the fact that GO is not uniformly dispersed and larger aggregates are easily formed in the existing GO modified grouting material.

Methods for producing an asphalt-based slurry seal composition are provided. An asphalt-based slurry seal base composition comprising asphalt emulsion, water, polymer emulsion, and solar reflective additive is obtained, where the seal base composition is free of an aggregate. Aggregate comprising a particle size mesh of no higher than mesh number 20 is obtained. The base composition is mixed with the aggregate obtaining slurry seal composition. The slurry seal composition is applied to an asphalt surface. Asphalt-based slurry seal compositions comprising asphalt emulsion, water, extender, sand, polymer emulsion, clay, fiber, solar reflective additive, and aggregate comprising a particle size mesh of no higher than mesh number 20 are also provided.

According to the soil in-situ reconstruction and soil improvement method suitable for the open-air grassland mining area, soil in the grassland mining area is reconstructed, the subsoil layer, the isolation layer and the reconstructed soil layer are sequentially arranged from bottom to top, the added clay isolation layer has the water and fertilizer retention effect, plant growth is facilitated, and the soil in-situ reconstruction and soil improvement effects are achieved. Sandy soil and clay are compounded to serve as a reconstructed soil layer, the used clay is high in organic matter content and can be bonded into micro aggregates and large aggregates, the soil texture is compact, soil particle gaps are small, and the water and fertilizer retention capacity is high. On the basis, the multi-dimensional soil improvement method is provided and comprises the steps of platform and slope soil reconstruction, platform soil fertility improvement and platform microtopography finishing, and the ecology of the grassland mining area can be effectively restored through the synergistic effect of the multi-dimensional improvement scheme.

The utility model provides a detachable large aggregate screening device. The detachable large aggregate screening device comprises a supporting frame body, a support, a supporting rod, a screening net and an aggregate collecting base. Wherein the supporting rod comprises a short supporting rod and a long supporting rod; the supports are welded to the four corners of the supporting frame body respectively, and the supports are provided with inserting holes matched with the supporting rods. The long supporting rods are respectively inserted into the left upper support and the right upper support; the short supporting rods are respectively inserted into the supports at the left lower part and the right lower part; the supporting frame body is obliquely supported on the ground through the supporting rods; the screening net is fixedly mounted on the surface of the supporting frame body; and the aggregate collecting base is placed below the supporting frame body. According to the detachable large aggregate screening device, aggregate screening can be easily and conveniently achieved, the design of a detachable structure, a split structure and the like is adopted, installation and transportation are convenient, and the detachable large aggregate screening device has important engineering application value.

The present application provides a loose evaluation method for asphalt pavement, and belongs to the technical field of loose evaluation for asphalt pavement. The aggregate cleaning device is used to sweep and collect loose aggregate of the asphalt pavement in a specific area. The collected aggregate is conveyed to a vibration table for vibration and shaking. A laser array is used for scanning to obtain the particle size of all aggregates. The particle sizes of all aggregates are compared to obtain the particle size of the largest aggregate. Then, the identification range size is selected according to the particle size of the largest aggregate. The laser imaging principle is used to irradiate and identify the asphalt pavement from the top of the pavement to obtain each spalling pit hole in the test area. The loose rate of the asphalt pavement is calculated according to the size of the aggregate and the spalling pit hole. Then, the loose degree of the asphalt pavement is evaluated according to the loose rate. The scattered aggregate is collected for detection and grouping. The particle size of the aggregate is used as the reference value of the measurement range to realize more accurate measurement of the spalling pit hole area. The whole measurement process does not involve cutting the pavement or digging, which well protects the road.

The invention discloses an anti-rut and anti-stripping recycled asphalt mixed material. The material is mainly prepared from a treated RAP asphalt aggregate mixture and a new asphalt binder. Furthermore, the content of RAP in the RAP asphalt aggregate mixture is 25%-30%, and the effective utilization rate of the new asphalt binder is 75%. The method comprises the following steps: dividing an RAP asphalt aggregate mixture into aggregate with the maximum particle size of 25mm, heating the RAP and a new asphalt binder to obtain the viscosity of the coated aggregate, mixing until the aggregate is uniformly coated, continuously heating and compacting the mixture, repeatedly compacting 6 batches of recycled asphalt mixture with the compaction height of 150mm, and curing for 24 hours. The asphalt mixture designed by adopting a large aggregate size is better than a mixture with a small particle size in anti-rutting and anti-stripping performances.

The application provides a method for increasing the proportion of large-diameter soil aggregates based on straw utilization, and relates to the tobacco planting technical field.The method comprises the following steps: S1: crushing field straw and stubble by using a crusher to obtain crushed materials; S2: mixing the crushed materials with organic fertilizer and water, and centrally stacking on the surface of soil to pre-ferment to obtain mixed materials, then spraying bacteria liquid 1, covering a film, and carrying out aerobic fermentation to obtain fermented materials; S3: removing the film, uniformly spreading the fermented materials, spraying bacteria liquid 2, using a powder ridge deep plough to plough, and carrying out water irrigation treatment to carry out anaerobic fermentation.The method has a greater influence on the powder clay aggregates and the medium aggregates in the plough layer soil, and has a smaller influence on the large aggregates; for the plough bottom layer soil, the method reduces the proportion of the powder clay aggregates, realizes the expansion of the small-diameter aggregates, improves the proportion of the medium and large aggregates, and is beneficial to expanding the depth of the plough layer.

The present disclosure describes a preformed or in some cases a hot applied thermoplastic marking composition comprising a planar top surface portion and a planar bottom surface portion that are coplanar to each other, wherein said bottom surface portion is directly applied to a substrate via application of heat or pressure or both heat and pressure and wherein said top surface portion comprises an intermix that exits throughout said thermoplastic composition and includes large grit size aggregate in the range of about 8 to about 20 mesh or grit size, thereby reducing or eliminating tire tracking while also improving long-term skid resistance.

The present application relates to the technical field of mine aggregate mining equipment, in particular to a mine aggregate conveying system braking reinforcement structure, comprising a support, a belt conveyor, a braking reinforcement device and a rockfall prevention device, which solves the problem that the existing mine aggregate conveying system mostly adopts belt conveyor inclined conveying, when braking occurs, the large aggregate on the belt conveyor will slide (roll) downward due to the action of braking inertia and its own gravity, not only driving other aggregate to roll (slide) downward to the outside of the belt conveyor, but also possibly falling into the inside of the belt conveyor, causing the phenomenon of jamming, reducing the conveying output of the aggregate, and additionally, the problem of needing to add artificial cleaning of the jammed aggregate, in addition, the problem of the aggregate falling downward to the outside of the belt conveyor possibly injuring the construction personnel passing below the belt conveyor, thereby causing unnecessary personal and economic losses is solved.

The utility model discloses a composite flame retardant processing, cooling and crystallizing device, which relates to the technical field of chemical machinery and equipment, and comprises a bottom plate, the outer wall of the top of the bottom plate is fixedly connected with a support frame, and the inner wall of the support frame is fixedly connected with a sleeve. And when the stirring frame rotates, the fixed plate is driven to move circumferentially together. At the moment, a fixing plate drives a second stirring rod to move together in the same track, a pinion connected with the second stirring rod rubs with a gear ring, the gear ring drives the second stirring rod to rotate, and when a sleeve rod rotates, the sleeve rod drives the second stirring rod to rotate together; the effect of fully and uniformly stirring the composite flame retardant solution is achieved, so that crystals are kept in a relatively dispersed state in the solution, the collision and aggregation opportunities among the crystals are reduced, the formation of large aggregates or agglomerates is avoided, fine and uniform crystal particles are favorably obtained, and the quality and performance of a product are improved.

The present invention discloses a method for simultaneously predicting the tensile strength and fracture toughness of concrete based on cube splitting specimens, aiming to solve the technical problem in the prior art that it is impossible to simultaneously test and detect the tensile strength and fracture toughness of concrete based on the same cube splitting specimen. The main steps are as follows: casting cube splitting specimens of different sizes with a fixed water-cement ratio, maximum aggregate size d max and aggregate type, and the joint height ratio α by static loading test method until the specimen is damaged to obtain the peak load P max ; calculating the virtual crack length and nominal stress of the specimen σ n ; equivalent crack length a e ; substituting the σ n and a e calculated for specimens of different heights into #imgabs0# for regression analysis to obtain the tensile strength and fracture toughness of concrete. The prediction result of the method of the present invention has high accuracy, reasonable prediction method, low test cost, is simple and practical, and is convenient for popularization and application.

This invention provides a method for constructing a chloride ion diffusion coefficient model for concrete, comprising the following steps: S1, obtaining the concrete mix proportion and the chloride ion diffusion coefficient of the concrete mortar made from the mix proportion; S2, based on the mix proportion, constructing a two-dimensional three-phase geometric model of the concrete using finite element software; S3, establishing a chloride ion diffusion coefficient model based on the constructed two-dimensional three-phase geometric model. This invention considers the influence of large aggregate distribution, enabling more accurate simulation of concrete erosion and providing reliable technical support for the durability of large-size aggregate concrete projects.

The application discloses a kind of efficient mixed delivery generation method and system of concrete three-dimensional mesoscopic model, it is related to mechanics and composite material numerical simulation technical field, including: determining aggregate gradation and carrying out interval discretization processing;Establish polyhedral aggregate geometric template library;Based on in-situ generation strategy, construct large aggregate skeleton;Based on global random sequence adsorption strategy, delivery medium aggregate;And based on space grid index mechanism, accelerate the delivery of small aggregate.The application uses the above-mentioned efficient mixed delivery generation method and system of concrete three-dimensional mesoscopic model, for the delivery of huge number of small aggregate, innovatively introduces background space grid index algorithm, the global collision detection complexity of traditional random sequence adsorption algorithm in the number of aggregate is exponentially increased O ( N 2 ), optimization is only needed in constant level detection O ( C ) in local neighborhood, so as to break the computing power bottleneck of high volume fraction mesoscopic model construction, realize the efficient delivery of mass aggregate.

The present invention discloses an installation confirmation method, a confirmation system, and a confirmation terminal for a deep vertical shaft concrete chute, which include determining the maximum aggregate particle size of concrete to be transported, determining the chute flow rate, the chute flow rate, and calculating the inner diameter of the concrete chute: calculating the wall thickness of the concrete chute, determining the initial concrete discharge speed, determining the minimum vertical drop distance of the chute, and determining the depth of the vertical deep shaft; and determining whether to install a descender. The present invention determines relevant parameters of the concrete and determines the required chute parameters according to construction requirements, and then determines the parameters of the chute according to the above parameters, and then determines whether a descender is needed by comparing the chute parameters with the vertical deep shaft. If a descender is needed, the parameters of the descender are calculated to obtain an installation method for the descender.

The invention relates to the technical field of curing agents, in particular to a soil curing agent and a preparation method thereof.The soil curing agent is prepared from, by weight, 180-220 parts of fly ash, 160-180 parts of slag, 80-120 parts of calcium salt, 80-120 parts of potassium nitrate, 10-14 parts of microbial agents, 40-60 parts of sustained-release capsule particles and 20-30 parts of biological stimulants. Therefore, the soil structure is improved, and the content of large aggregates in the soil can be remarkably increased.

The utility model discloses a concrete stirrer for a concrete production line, which relates to the field of concrete and comprises a first shell, a second shell is arranged above the first shell, a toothed plate is rotatably mounted on the lower surface of the second shell, and the toothed plate is rotatably mounted in the middle of the upper surface of the first shell. A central column is arranged in the first shell, a top plate is fixedly mounted at the top end of the central column, the bottom end of the central column is rotationally clamped in the middle of the bottom surface of the first shell, and the top plate is rotationally mounted in the middle of the top end of the first shell. After the materials are fully mixed, the materials are conveyed into the first shell, wet mixing is completed in the first shell, then the materials are discharged from the discharging port, dry and wet separation is achieved, the materials are fully mixed firstly, and then water is added, so that the stirring uniformity can be improved, and the situation that the large aggregates are non-uniformly mixed is prevented.

A process for removing Pb2+ ions from fluids, such as gastrointestinal fluids is described. The process involves contacting gastrointestinal fluid with a particulate metal titanate ion exchanger represented by the empirical formula:AmTixMyOz where A is an exchangeable cation selected from the group consisting of potassium ion, sodium ion, lithium ion, calcium ion, magnesium ion, hydronium ion, and mixtures thereof, and M is optionally at least one framework metal selected from niobium (5+), zirconium (4+), tin (4+), iron (3+), iron (2+), cobalt (2+), and manganese (2+). The particulate metal titanate ion exchangers of the present disclosure are synthesized in the presence of complexing agents, including at least one multihydroxyl-containing complexing agent (MHCA), which facilitate metal transport and incorporation while imparting beneficial properties such as large aggregate size, well-behaved particle size distribution, and macroporosity.

This invention belongs to the field of agricultural microbial applications, specifically a multifunctional bacterium W1. It can induce the formation of a cementitious substance by hydrolyzing urea and amino acids to produce alkali, and simultaneously secretes extracellular polysaccharides and the plant growth-promoting substance indoleacetic acid. Furthermore, it exhibits a synergistic effect with hydrothermal charcoal. It was deposited on October 12, 2024, at the China General Microbiological Culture Collection Center, and the proposed classification name is *Defective Shortwave Monoclonal*. Brevundimonas diminuta The study, numbered CGMCC No.32186, used Bacterium W1, hydrothermal charcoal, inorganic nitrogen fertilizer, human and animal manure, and calcium source as soil conditioners for sandy soil and verified them by planting maize. It showed that the conditioners could promote the cementation of soil particles in sandy soil, increase the number of mechanical and water-stable large aggregates, increase the organic matter content of sandy soil, enhance the water and fertilizer retention capacity of sandy soil, enhance the drought resistance and nutrient absorption capacity of maize, and thus increase maize yield.

The invention belongs to the technical field of concrete slab recycling, and particularly relates to a multi-erosion autoclaved aerated concrete slab recycling device and a construction method thereof.The multi-erosion autoclaved aerated concrete slab recycling device comprises a smashing mechanism, a screening mechanism, a briquetting mechanism, a material box and a feeding mechanism; the crushing mechanism comprises a box body, and a rotating shaft is rotationally mounted in the box body; the device further comprises a first pressing roller and a second pressing roller, the first pressing roller and the second pressing roller are both fixedly connected to the surface of the rotating shaft, and a supporting shaft is rotationally installed on one side of the box body. Intermittent meshing of an incomplete gear and a toothed plate is adopted to drive the screen to vibrate at high frequency, a buffer guide structure of a spring and a guide rod is matched, the screening effect is greatly improved, screen holes are prevented from being blocked, large particles and small particles of aggregate can be separated through the screen, the large particles can enter a material box again, a feeding mechanism can convey and smash the aggregate again, and the screening efficiency is improved. Small-particle aggregates can be pressurized and formed through the coordination action of the multidirectional dies (the bottom die, the side dies and the upper die) matched with the electric telescopic rod.

The invention relates to the technical field of coal washing, and discloses a dense medium flotation dual-system coupled fine coal slime high-recovery-rate coal washing device which comprises a flotation box, a collecting mechanism and a dispersing mechanism and further comprises two sets of flotation mechanisms fixedly installed on the two sides of the top of the flotation box and a driving mechanism rotationally installed on the top of the flotation box. The dispersing mechanism is composed of a dispersing hopper, a channel, a spiral plate and a coaxial forward and reverse rotating dispersing assembly; according to the technical scheme, bidirectional shearing force is applied to coal slime through forward and reverse rotating dispersing paddles in the rotating coaxial forward and reverse rotating dispersing assembly, large aggregates are crushed into fine particles, the surface area of coal particles is increased, and agent adsorption and bubble attachment are promoted; in the process, the rotating coaxial forward and reverse rotation dispersing assemblies form a three-dimensional turbulent flow field in the suspension liquid, so that coal particles and bubbles are fully mixed, the layering phenomenon is eliminated, it is ensured that all particles have opportunities to participate in flotation, the dispersing efficiency and air flotation selectivity of fine-particle coal slime are remarkably improved, and the concentrate quality is optimized.

The utility model belongs to the technical field of soil analysis experiment equipment, and particularly relates to a soil water stability large aggregate sample test tool which comprises a base, screws, a clamping ring and a nut sliding block, the base is used for supporting a sieve tray, the two screws are rotationally installed on the two opposite sides of the base respectively, the four screws are used for jointly clamping the sieve tray, and the nut sliding block is arranged on the base. Each screw rod is sequentially provided with a clamping ring and a nut sliding block from bottom to top, the nut sliding blocks are in threaded connection with the corresponding screw rods, and fixing claws are arranged on the clamping rings in an obliquely downward mode. The soil water stability large aggregate sample experiment device is suitable for small-component samples and soil water stability large aggregate sample experiments needing to rapidly obtain experiment results, and is easy to manufacture and high in practicability. Operation is simple and easy to understand, no complex internal structure exists, the self-weight positioning piece can automatically position and clamp the sieve tray through the self weight of the sieve tray placed on the base, the operation difficulty is lowered, and the operation efficiency of an experiment is improved.

This application discloses a fiber-reinforced aggregate mixing device for marine concrete, belonging to the technical field of concrete production equipment. It includes a mixing chamber with a stirring shaft inside. Several stirring blades are fixedly connected to the outer wall of the stirring shaft. Small particles are directly fed into the mixing chamber through the inlet. Large aggregates are first ground and crushed by an aggregate grinding unit before being added to the mixing chamber, making it easier for the aggregates to mix with other materials. A stirring motor drives a transmission rod to rotate. A lifting sleeve fitted onto the outer wall of the transmission rod, through a sliding fit between a protrusion and an annular groove, can rotate synchronously with the transmission rod and slide up and down along the annular groove. The bottom of the lifting sleeve is fixedly connected to the stirring shaft. Therefore, the stirring shaft and stirring blades can simultaneously complete rotational mixing and axial lifting movements, covering areas of different heights within the mixing chamber, breaking up material stratification, and ensuring uniform mixing, thus improving mixing efficiency.

The application discloses a small sample-based concrete porosity gradient distribution measurement method based on nuclear magnetic resonance, realizes nondestructive measurement of the spatial gradient distribution of the porosity of a large aggregate concrete body, and solves the technical bottleneck that traditional nuclear magnetic resonance technology cannot obtain the continuous variation information of the porosity of the large aggregate concrete from the surface to the inside under the limitation of the size of the cavity of the equipment by establishing a mathematical mapping relationship between a small-size test block and the body porosity distribution. The method innovatively introduces statistical sampling theory and spatial weighted analysis into the field of concrete nondestructive testing, and realizes accurate reconstruction of the porosity gradient distribution of a large concrete body by using a small sample.

The invention discloses an asphaltene dispersant and a preparation method thereof, and belongs to the technical field of petrochemical industry. A plurality of ester polar functional groups exist in the asphaltene dispersant provided by the invention, so that asphaltene can be easily combined through intermolecular forces such as hydrogen bonds, and meanwhile, nitrogen atoms in the center of the asphaltene dispersant have a pair of lone pair electrons which can be used as acceptors of the hydrogen bonds to form the hydrogen bonds with hydrogen atoms in asphaltene molecules, so that the asphaltene dispersants are formed. Therefore, the adsorption force of the asphaltene lamellar structure is weakened; moreover, the long alkyl side chain can play a supporting role among asphaltenes, so that the asphaltenes are further prevented from being gathered, and large aggregates are not easy to form among the asphaltenes. Due to the characteristics, the addition amount of the asphaltene dispersant in the crude oil is less than or equal to 0.05%, and the addition amount is small, so that the preparation cost can be reduced. In addition, the addition amount is small, so that the influence of the addition of the asphaltene dispersant on the performance of the crude oil can be reduced.

The application provides a soil improvement method and a corn seeding method based on the vertical tillage principle, wherein straw is crushed, all the straw is returned to the field and uniformly scattered on the ground surface; combined soil preparation is carried out, and deep scarification and harrowing are sequentially carried out, the deep scarification depth reaches the plough pan, and the harrowing operation rakes part of the straw into the soil; two vertical tillage operations are carried out, part of the straw is mixed into the soil after the operation, and part of the straw is left to cover the ground surface. The soil water holding capacity can be significantly improved, the formation of large aggregates is promoted, the soil penetration resistance is reduced, the soil compaction is reduced, and the soil water erosion is reduced; and the corn seeding method provided by the application can promote the growth of the above-ground part and the root system of crops and significantly improve the crop yield.

The utility model discloses a scattering device for graphene preparation, and relates to the technical field of pay-off, the scattering device comprises a crushing box, a crushing mechanism is arranged in the crushing box, a high-speed dispersing mechanism is arranged in a dispersing box, and the output end of a second motor is connected with a rotating shaft. Through the arrangement of the crushing mechanism and the high-speed dispersion mechanism, the crushing mechanism primarily crushes and disperses graphene raw materials through mechanical force, mainly aims at large aggregates and particles, the high-speed dispersion mechanism serves as a second defense line, and the leaked fishes are dispersed again through high shear force and impact force, so that the large aggregates and particles are dispersed again. All agglomerated graphene raw materials can be thoroughly dispersed, the dispersion effect of the graphene is remarkably improved through a dual dispersion mechanism, the particle size distribution of graphene particles is more uniform through the continuous action of preliminary dispersion and fine dispersion, the agglomeration phenomenon is effectively restrained, and the product quality is improved. Therefore, the dispersity and the reinforcing effect of the graphene in the composite material are improved.

The utility model discloses a hot aggregate elevator for an asphalt concrete mixing plant, which relates to the technical field of elevators and comprises a base, an aggregate tray and a stabilizing block, a screening net is arranged at the top of the stabilizing block, a discharge port is arranged at the bottom of the aggregate tray, a triangular inclined block is arranged at the bottom of the aggregate tray, and a concentration box is mounted at the bottom of the aggregate tray. A sliding rail is installed on the inner wall of the concentration box, a sliding plate is movably installed on the inner wall of the sliding rail, and a concentration frame is arranged on the outer wall of the sliding plate. The screening mechanism is installed, the triangular inclined block is moved to the position below the stabilizing block, the screening net is placed above the stabilizing block, large aggregate is screened above the screening net through the screening net in the aggregate adding process, after screening is completed, the aggregate enters the centralizing frame to be collected, the centralizing frame is pulled, and then the aggregate is collected. And then, the centralizing frame is lifted to enable the fixing blocks to move from the fixing grooves, the centralizing frame is moved out of the centralizing box, and feeding of the equipment is facilitated.