37results about How to "Improved particle size distribution" patented technology

The invention relates to the technical field of concrete materials, and particularly discloses a composite mineral admixture, a preparation method thereof and concrete. The preparation method of the composite mineral admixture comprises the following steps: mixing and modifying dolomite powder, gypsum and calcium hydroxide to obtain pre-modified dolomite powder; then adding hexadecyl trimethyl ammonium chloride and octylphenol polyoxyethylene ether to obtain modified dolomite powder; and adding nickel slag, metakaolin, desulfurized fly ash and a grinding aid, and grinding to obtain the composite mineral admixture. The concrete prepared from the composite mineral admixture is excellent in compressive strength, shrinkage resistance, permeation resistance and the like, and the strength and durability of the concrete can be remarkably improved.

The invention relates to the technical field of cement production and manufacturing, aims at solving the problems that an existing grinding system is single in function and cannot have multiple cement grinding processes at the same time, and provides a composite multi-process cement grinding system and process and a cement production method. Wherein the composite multi-process cement grinding system comprises a roller press grinding system and a ball mill grinding system, and the composite multi-process cement grinding process comprises three grinding processes, namely a combined grinding process, a semi-final grinding process and a final grinding process; the cement production method comprises the following steps: separately grinding clinker and a mixed material by using two sets of cement grinding systems, and then mixing by using a mixing system to obtain a finished product. According to the invention, the limitation of a single grinding system is broken through, the operability of the system is improved through an ingenious switching means, and the advantages and functions of production through one system and coexistence of multiple technological processes are realized.

The invention provides a foam surface particle stacking strength determination method and a foam stabilizing particle size distribution optimization method. The foam surface particle stacking strength determination method comprises the following steps: performing particle construction according to particle size distribution of target surface particles, uniformly distributing the constructed particles in a gridding target area at an initial moment, and endowing each constructed particle with an initial speed; repulsive force, attractive force, friction force, radial force Brown force and stress generated by the flow field action borne by each particle and the liquid phase volume fraction of each grid are determined; further determining the flow field velocity of each grid; further determining the resultant force, the dragging force and the lifting force of the gravity and the buoyancy borne by each particle; further determining the speed and the position of the particles in the next time step length; the steps are repeated until the simulation time requirement is met, and then the mechanical strength borne by the particle system is determined based on the repulsive force, the attraction force, the friction force, the radial force Brown force, the resultant force of the gravity and the buoyancy force, the dragging force and the lifting force borne by the particles.

The invention belongs to the field of sludge utilization, and relates to a method for preparing roadbed filler through solidification and modification of water supply plant sludge. Comprising the following main steps: mud detection: aiming at dewatered sludge of a water supply plant, carrying out mud index detection, analyzing mud characteristics of the sludge, and evaluating feasibility of preparing roadbed filler from the sludge and key of a curing modification technology; sludge conditioning: uniformly mixing dewatered sludge of a water supply plant with a hydration conditioner, carrying out material covering and stacking, and then digging, airing and crushing for later use; curing and modifying: sequentially adding a gel curing agent, high polymer fibers and a resin water-retaining agent into the conditioned sludge, and uniformly mixing to obtain roadbed filler; and filler detection: carrying out environmental index detection and indoor soil test on roadbed filler, and evaluating whether the mechanical properties of the sludge curing modified filler meet the design requirements or not. The method can realize water supply plant sludge solidification modification, improve the sludge bearing ratio and shear strength, reduce the environmental risk of using heavy metals and pathogenic bacteria in sludge building materials, and is beneficial to solving the double dilemma of sludge outlet shortage and road base material shortage in urban development.

The invention discloses a cementing material capable of improving toughness, which comprises the following components in percentage by mass: 9.2-16.2 wt% of a high-activity auxiliary cementing material A, 49.4-53.5 wt% of a high-performance cementing material B and 30.3-41.4 wt% of a high-toughness auxiliary cementing material C. The high-activity auxiliary cementing material A is one or more of silica fume, slag or high-calcium fly ash; the high-performance cementing material B is high-iron-phase high-belite cement clinker, and the high-toughness auxiliary cementing material C is modified rubber powder. From the perspective of the cement clinker, the high-performance cementing material with high strength and large bending-compression ratio is prepared by adjusting the mineral composition of the cement clinker, optimizing the grain composition of the cement, adding the high-toughness auxiliary cementing material and the like, so that the problem of high brittleness of the cement-based material is fundamentally relieved.

This invention belongs to the field of industrial solid waste resource utilization technology, and relates to a circulating fluidized bed ash-based cementitious material for road base courses and its preparation method. The raw materials for the road base course cementitious material are composed of the following mass parts: 29-43 parts of circulating fluidized bed ash, 16-27 parts of ground blast furnace slag, 3-6 parts of silica fume, 7-15 parts of P.O42.5 silicate cement, 0.1-0.4 parts of activator, and 27-30 parts of water. The circulating fluidized bed ash is prepared by mixing circulating fluidized bed fly ash and slag in a mass ratio of (2-5):(5-10). This invention effectively alleviates the problems of fast setting time and shrinkage cracking of traditional road base course cementitious materials by utilizing the characteristics of micro-expansion and long hydration time of circulating fluidized bed ash. The advantage of this invention is that it promotes the large-scale utilization of circulating fluidized bed ash and contributes to carbon emission reduction in the road sector.

This invention discloses an integrated molding method for metallic chromium powder and additives, comprising: crushing chromite ore and mixing it with aluminum powder, adding additives, mixing and pressing the mixture into a compact, and then feeding it into an electric arc furnace for an electrothermal reaction; after the reaction, separating the slag and metallic chromium; crushing the prepared metallic chromium, adding a binder to the crushed metallic chromium powder, mixing, and then performing high-temperature sintering treatment to obtain high-temperature sintered metallic chromium powder, which is then cleaned and dried; pressing the dried metallic chromium powder into blocks to obtain the finished metallic chromium product. This invention addresses the issue of high carbon content in existing electrothermal methods for preparing metallic chromium by adding chromium trioxide, tin powder, or highly active tin powder to chromite ore. The reaction of chromium trioxide with carbon removes impurities, while the reaction of tin powder with sulfur generates volatile tin sulfide, thereby removing sulfur impurities from the metallic chromium and improving the purity of the finished metallic chromium product.

The invention relates to a flame retardant and a preparation method and application thereof, and relates to the technical field of flame retardants, the preparation method of the flame retardant comprises the following steps: adding hypophosphite, polyethylene glycol and a silane coupling agent into water, and stirring to obtain a first mixture; performing pulsed electric field treatment on the first mixture to obtain a second mixture; and filtering the second mixture, and washing and drying the obtained solid product to obtain the flame retardant. According to the invention, a material system composed of hypophosphite, polyethylene glycol and a silane coupling agent is modified by adopting a pulsed electric field technology, so that the physical properties such as particle size distribution and particle regularity of hypophosphite are remarkably improved, and the compatibility and flame-retardant effect of hypophosphite and a high polymer material are also improved; the defects of the existing hypophosphite flame retardant are overcome.

The invention relates to the technical field of glass bead production, and discloses a method for preparing glass beads by mixing open-hearth liquid slag with blast furnace waste slag and continuous casting slag, which comprises the following steps: S1, raw material pretreatment: pretreating the open-hearth liquid slag, firstly filtering the open-hearth liquid slag to remove impurities, and then introducing into an electrode heating furnace to heat, the method comprises the following steps: S1, preparing raw materials, S2, preparing raw materials, S3, preparing raw materials, S4, preparing raw materials, S4, preparing raw materials, S4, preparing raw materials, S4, preparing raw materials, S5, collecting and screening glass beads, and S6, detecting products and controlling quality. By adding sodium carbonate and borax for fine adjustment of components and performing ingredient calculation and mixing through accurate component analysis, the components of the mixed liquid slag can be adjusted, and the viscosity, surface tension and solidification characteristics of the mixed liquid slag are changed, so that the particle size distribution after air quenching granulation is optimized, the state and performance of a precipitated phase after slag liquid solidification are improved, and the production quality of glass beads is ensured.

The invention provides a method and technology for preparing MHP through laterite-nickel ore hydrometallurgy crystallization control, and belongs to the technical field of laterite-nickel ore hydrometallurgy. The method comprises the steps that the number of multiple crystal nucleuses after a nucleation reaction is conducted on liquid obtained after iron and aluminum are removed is determined on the basis of nucleation reaction conditions; determining the average grain size of the plurality of crystal grains after the plurality of crystal nucleuses are subjected to primary growth on the basis of primary growth reaction conditions; and based on a Metropolis algorithm, the number of the crystal nucleuses and the average particle size, determining predicted particle size distribution of the agglomerated crystal grains after secondary agglomeration and growth of the plurality of crystal grains. According to the predicted particle size distribution result, the reaction conditions of the nucleation reaction and the primary growth reaction are adjusted, and the number of crystal nucleuses and the average particle size are controlled, so that the high-performance MHP product with better particle size distribution is obtained, and the method has a guiding effect on the crystallization process of MHP.

The invention discloses a zero-dimensional indium-based organic-inorganic hybrid perovskite material and a synthesis method thereof, and belongs to the technical field of photoelectric materials, the perovskite material has a general formula, R is one or more organic cations selected from methylamine, formamidine and cesium, and X is one or more halide ions selected from methylamine, formamidine and cesium; the invention further discloses a synthesis method of the material, the synthesis method comprises the steps of precursor solution preparation, coordination regulation and control, solvothermal reaction, product separation, surface modification, purification and drying, and the crystal structure and the surface chemical environment are precisely regulated and controlled through the synergistic effect of coordination regulation and surface passivation. The photoluminescence quantum yield of the material reaches 82% or above, and the material has excellent luminescence performance in a solution state, has ultrahigh environmental, water and thermal stability, and is lead-free, non-toxic and environment-friendly; the material can be widely applied to the photoelectric fields of light emitting diodes, X-ray scintillators, photocatalysis and the like, and the device performance is excellent.

The invention relates to the technical field of building materials, in particular to solid waste wave-absorbing concrete aggregate, a preparation method and concrete.The solid waste wave-absorbing concrete aggregate is prepared from, by weight, 18%-22% of coal gangue, 4%-6% of lithium slag, 8%-12% of steel slag with the particle size ranging from 0 mm to 5 mm, 17%-23% of steel slag which is subjected to hydrophobic treatment and has the particle size ranging from 5 mm to 10 mm and 40%-50% of steel slag which is subjected to carbonization treatment and has the particle size ranging from 10 mm to 20 mm. According to the aggregate, the preparation method and the concrete, the problem of poor stability can be effectively solved, and the concrete is higher in strength and better in wave absorbing performance.

The application discloses a kind of high-concentration amino acid surfactant transparent concentrate stabilization method, comprising the following steps: step one, raw material precision weighing and pretreatment, step two, first low-temperature assisted dispersion, step three, second step gradient temperature control dissolving, step four, three-dimensional synergistic stabilization treatment, step five, gradient pH precision control, step six, low-temperature homogenization curing, step seven, product filtration and detection;The application constructs the stabilization method of step-by-step gradient temperature control dissolving and three-dimensional synergistic stabilization system, different from the prior art one-step mixing, single thickening stabilization, by batch feeding, gradient temperature control dissolving, avoid high-concentration amino acid surfactant due to local concentration too high, temperature sudden change leads to molecular aggregation crystallization, from source inhibit turbidity and phase separation.

The present invention provides a wear-resistant and stain-resistant UHPC white decorative board, a composition and a preparation method; the composition of the wear-resistant and stain-resistant UHPC white decorative board includes, by mass, 89-91 parts of white silicate cement, 8-15 parts of silane-modified white auxiliary cementitious material, 0.5-1.0 parts of organic silicon hydrophobic agent, 100-120 parts of stearic acid-modified white dolomite aggregate, 2.5-4 parts of liquid water reducer, 0.20-0.30 parts of liquid defoamer, 0.10-0.30 parts of anti-cracking fiber, and 18-22 parts of water. The UHPC white decorative board in the present invention has ultra-high performance, and it not only has good appearance quality, but also has excellent characteristics such as high strength and toughness, high density and high wear resistance, strong hydrophobicity and strong stain resistance.

This invention discloses a high-compact, high-capacity lithium iron phosphate cathode material and its preparation method. Using iron phosphate and iron hydroxide as a mixed iron source, a two-step synthesis method is employed. First, the two raw materials are ground to one large particle size and one small particle size. The large particle size is sintered at two different temperatures to prepare large and medium particles, while the small particle size is sintered at two different temperatures to prepare small and ultra-small particles. Then, the large and medium particles are mixed and ground to a large particle size, and the small and ultra-small particles are mixed and ground to a small particle size. The mixing of large and small particle sizes increases the particle size distribution, and sintering yields the high-compact, high-capacity lithium iron phosphate cathode material. The mixing and grinding of multiple particles in this invention further increases the particle size distribution and improves the compaction density of the cathode material. The use of a low-molecular-weight carbon source in the first sintering stage is beneficial for particle coating and improves particle roundness. The use of a high-molecular-weight carbon source in the second sintering stage constructs a continuous conductive network, ensuring the material's capacity is fully realized.

The invention belongs to the technical field of grinding devices, and discloses an art teaching pigment grinding device which comprises two mounting frames, connecting columns are symmetrically clamped and mounted between the bottom ends of the inner walls of the two mounting frames at equal intervals, and driving rods are symmetrically and rotationally connected to the top ends of the inner walls of the two mounting frames at equal intervals; a grinding assembly is rotationally connected between the two driving rods, the grinding assembly comprises a grinding barrel rotationally connected to the top ends of the driving rods, and a barrier plate is mounted at the top end of the inner wall of the grinding barrel in a clamped mode. And compared with a single grinding ball mode, the multi-layer screen cloth and the grinding balls are matched for use, so that concentrated collision of the grinding balls in unit volume can be dispersed and reduced, the abrasion to the inner wall of the grinding barrel and the grinding balls is reduced, and the service life of equipment is prolonged.

This invention discloses a gradient self-excited low-carbon cement and its preparation method, comprising the following raw materials in parts by weight: 15-20 parts of early-age self-excited cementitious material with a particle size of 0.1-10 μm and a specific surface area of ​​1150-1250 m². 2 / kg, uniformity coefficient >1.1; 45-50 parts of middle-aged self-stimulating cementitious material, particle specific surface area 380-400m² 2 / kg, uniformity coefficient > 1.1, R 45μm Silica residue <5%; 20-25 parts of long-term self-activating cementitious material, particle specific surface area 480-550 m² 2 / kg, uniformity coefficient > 1.1, R 45μm Residue on sieve <2%; 10-15 parts of rheology-active material, particle specific surface area 240-300 m² 2 / kg, uniformity coefficient > 0.9, R 45μm The residue on the sieve is less than 40%. This invention achieves a gradient self-excitation effect from early age to long age, ensuring the mechanical properties of low-carbon cement throughout its entire service life.

The invention relates to a controlled-release linalool emulsion based on a ternary system as well as a preparation method and application of the controlled-release linalool emulsion. The linalool emulsion is an oil-in-water Pickering emulsion composed of a water phase and an oil phase, the water phase comprises a ternary system composed of soybean protein isolate, pectin and hydroxypropyl methyl cellulose, and the oil phase is linalool essential oil. The preparation method comprises the following steps: respectively preparing soybean protein isolate, pectin and hydroxypropyl methyl cellulose solutions, and mixing to obtain a ternary composite water phase; and mixing the ternary composite water phase with the oil phase, and carrying out high-pressure homogenization treatment and ultrasonic treatment under a low-temperature condition to obtain the controlled-release linalool emulsion based on the ternary system. Compared with the prior art, the linalool essential oil emulsion embedding method solves the problem that linalool is easy to volatilize, and can be used in the fields of fruit and vegetable fresh keeping, tea fragrance maintaining and the like.

The application relates to a full-solid-waste high-activity composite admixture and a preparation method thereof, raw materials of the full-solid-waste high-activity composite admixture comprising: mixed-milling micro-powder of steel slag tailings and refining slag, and slag micro-powder; wherein the content of the mixed-milling micro-powder is 20-30 parts by weight, and the content of the slag micro-powder is 70-80 parts by weight. Through the synergistic effect of the raw material re-mixing, the activity of the admixture is improved, the stability of the chemical performance index of the admixture is ensured, the use proportion of the admixture in cement and mortar is improved, the consumption of cement is saved, and then the cost is reduced. The metallurgical industrial solid waste such as steel slag tailings, refining slag, blast furnace slag and the like is realized to be resourcefully utilized, and the problem that long-term stacking occupies land and cannot be absorbed is solved.

The invention relates to the technical field of preparation processes of battery-grade lithium carbonate, and discloses a preparation system of battery-grade lithium carbonate and a preparation method of the battery-grade lithium carbonate. Comprising a pulping tank, a homogenizing pump, a first reactor, a carbonization buffer tank, a first circulating pump, a filter, an ion exchange device, a delivery pump, a second reactor, a slurry buffer tank, a second circulating pump and post-treatment equipment which are sequentially connected through a main pipeline, the first proportioning valve is connected with the pulping tank through a first return pipeline, a second proportioning valve is arranged between the first circulating pump and the filter, the second proportioning valve is connected with the first reactor through a second return pipeline, and a third proportioning valve is arranged between the second circulating pump and the post-treatment equipment; and the third proportioning valve is connected with the second reactor through a third reflux pipeline. The preparation process is simplified, the use cost is reduced, and the preparation efficiency is improved.

The application discloses an oxygen-enhanced pH-responsive magnetic targeting photosensitizer delivery system, which is recorded as Fe3O4@mSiO2@MnO2@PS@PEG-b-PAsp, and the delivery system takes the superparamagnetic Fe3O4 core as a magnetic targeting matrix, is covered with mesoporous silica outside, and is crosslinked with polyethylene glycol-polyaspartic acid after being modified by amino on the surface of the mesoporous silica, so that the loading of the photosensitizer is realized. The oxygen-enhanced pH-responsive magnetic targeting photosensitizer delivery system provided by the application realizes the magnetic targeting property and the pH responsiveness, and realizes the effect of increasing the concentration of intracellular reactive oxygen species.

The utility model discloses a recycled asphalt concrete paving device, and relates to the technical field of asphalt concrete paving, the recycled asphalt concrete paving device comprises a first motor, a crushing mechanism is arranged on the outer wall of the first motor, and a feeding pipe is fixedly connected to the top of the crushing mechanism. At the moment, a first motor can be started firstly, then a first rotating shaft drives a first gear on the surface to rotate clockwise, then the first gear drives a first gear beside the first gear to rotate anticlockwise, and meanwhile the first rotating shaft rotates to drive a first belt wheel on the surface to rotate; then, a first belt wheel drives a first belt on the inner wall to conduct transmission and drives a second rotating shaft to rotate, then, the second rotating shaft drives a second gear to rotate clockwise, then, the second gear drives a second gear on the side to rotate anticlockwise, and then asphalt concrete is poured into a feeding pipe; afterwards, the asphalt concrete is conveyed into the center points of the first crushing wheels on the two sides through the limiting plates.

The invention provides low-carbon corrosion-resistant composite cement and a preparation method thereof. In the pretreatment process of ordinary silicate and high-silicon iron-rich phase low-carbon corrosion-resistant cement clinker, according to the characteristics of raw materials, different cement clinker main distribution intervals are concentrated in corresponding intervals of a grading model to achieve a close packing effect, meanwhile, hydration intervals of silicon-phase minerals and aluminum-phase minerals are matched, and the high-silicon iron-rich phase low-carbon corrosion-resistant cement clinker is obtained. More aluminum ions are promoted to enter the gel, the gel structure is optimized, the clinker consumption is reduced, and the overall mechanical property and durability of the material are improved. Through the synergistic excitation effect between the composite reinforcer and the cement hydration product, the hydration degree of the auxiliary cementing material is improved, the pore structure is optimized, the hydration interval of the silicon-phase mineral and the aluminum-phase mineral is further matched, the dosage of cement clinker is reduced, the dosage of the auxiliary cementing material such as the building regenerated micro powder is increased, and the utilization rate of the cement is increased. The effects of reducing carbon and reducing emission are further achieved.

This invention relates to the field of non-metallic mine backfilling technology, and particularly to a potash mine solid-liquid tailings-based backfill material and its preparation method. The preparation method of the backfill material includes: mixing potassium phosphate with tailings to obtain a phosphate brine solution; dry mixing composition 1 of a composite binder with the tailings to obtain a uniform dry material; adding the phosphate brine solution to obtain a uniform slurry 1; adding a mineral carrier-loaded slow-release alkali source to the uniform slurry 1 to obtain a uniform slurry 2; first adding a polycarboxylate superplasticizer to the uniform slurry 2 and mixing, then adding an associative thickener solution and mixing, and finally adding anionic polyacrylamide to obtain the backfill material. The backfill material prepared by this invention achieves a coordinated balance between slurry fluidity, anti-segregation, pumpability, and backfill strength, providing an economical, environmentally friendly, and efficient technical solution for backfilling non-metallic mine goaf areas.

This invention, entitled "A Camellia Seed Oil Microcapsule Emulsion and Its Preparation Method and Application," belongs to the field of cosmetic technology. The technical problem it aims to solve is the deficiency in existing technologies where camellia seed oil is prone to rancidity, leading to reduced stability and bioavailability of formulations. This invention provides a camellia seed oil microcapsule emulsion system that can slow down the rancidity process, thus achieving a transition from oil-soluble to water-soluble camellia seed oil. The key technical solution is a camellia seed oil microcapsule emulsion, the raw materials of which consist of camellia seed oil, sodium caseinate, chitosan hydrochloride, PE9010, and a solvent.

A special cement for wind power generation concrete tower and a preparation method thereof belong to the technical field of cement. The cement comprises the following components by weight: 80-85 parts of clinker, 3-5 parts of gypsum, 3-4 parts of stone, 8-12 parts of mineral powder and a grinding aid; the content of tetracalcium aluminoferrate in the clinker is ≥14%, and the alkali content is 0.45-0.55%; the steps are as follows: (1) adding clinker, gypsum and stone to a roller press for extrusion to obtain component A; (2) component A is selected by a powder selector and then mixed with a grinding aid to obtain component B; (3) the mineral powder and the milled component B are mixed to obtain a special cement for wind power generation concrete tower. The special cement for wind power generation concrete tower prepared by the present invention has high compressive strength; it has high adaptability by adopting low-alkali clinker, and the content of tetracalcium aluminoferrate in the clinker is ≥14%, so that it has high flexural strength; the proportion of clinker in the special cement for wind power generation concrete tower is high and the proportion of other auxiliary materials is low, so the water consumption of cement standard consistency can be effectively reduced.

The invention discloses a high-molecular impact-resistant protective coating and a preparation method thereof, and belongs to the technical field of high-molecular materials, and the high-molecular impact-resistant protective coating comprises the following raw materials: 30-50 parts by weight of epoxy resin, 15-20 parts by weight of silicon resin, 10-20 parts by weight of an impact-resistant modifier, 7-15 parts by weight of a filler, 2-10 parts by weight of an auxiliary agent and 10-20 parts by weight of a curing agent. By adding sodium lauryl sulfate, the compatibility of polyvinyl alcohol and a coating matrix can be improved, and polyvinyl alcohol can form a net structure in the curing process, so that the toughness and the impact resistance of an impact-resistant modifier are improved, the impact resistance and the hardness of the coating are remarkably improved, and meanwhile, by virtue of a specific filler ratio, the coating has a good application prospect. The barium sulfate, the mica powder, the walnut shell powder and the kaolin are combined with the organic resin, so that good grain composition is realized, an advantage complementary effect is exerted, and a more uniform and compact coating structure is formed, so that the rigidity and the strength of the coating are improved, and meanwhile, when the coating is impacted by external force, stress is effectively dispersed.

The application discloses a modified epoxy emulsion for water-based heavy-duty anticorrosive paint and a preparation method and application thereof, and relates to the following technical scheme: a functional group modified carbon nine resin is reversely emulsified with an epoxy resin to obtain a modified epoxy emulsion with small particle size, good stability and excellent water-based anticorrosive performance, the average particle size of the modified epoxy emulsion dispersion phase is small, the particle size distribution is good, the emulsion performance is stable, the preparation process is simple, and large-scale industrial production can be realized; after the modified epoxy emulsion is made into an anticorrosive paint primer, the salt water resistance of the coating reaches more than 300 hours without blistering, the salt mist resistance can reach more than 1440 hours without blistering, and the C4 level heavy-duty anticorrosive paint standard requirement is met.

The application discloses a vertical roller mill and a machine-made sand production system, and relates to grinding equipment technology. The roller mill comprises a grinding part, wherein a grinding disc and a grinding roller constitute part of the grinding part. The roller mill comprises a pre-milling part and an adaptive material blocking adjusting part. The pre-milling part is composed of a feeding center shaft and milling units, and the feeding center shaft is located above the grinding disc. The N milling units are uniformly distributed around the feeding center shaft, and the pre-milling part of the milling units is in contact with the grinding end face of the grinding disc. The adaptive material blocking adjusting part comprises a rocker seal frame, a material blocking device and a linkage assembly. The rocker seal frame serves as a grinding roller support and is installed on the roller mill rack. The material blocking device comprises a fixed material blocking device and a sliding material blocking device combined with the fixed material blocking device through vertical movement, and the two devices jointly form a surrounding blocking structure. The linkage assembly connects the rocker seal frame and the sliding material blocking device, so that the rocker seal frame drives the sliding material blocking device to move upwards through the linkage assembly. Through the technical innovations, the performance of the vertical roller mill is comprehensively improved.

This utility model relates to a novel grinding disc-assisted grinding device for a sand mill, comprising a frame, a variable frequency motor fixedly installed inside the frame, a bearing seat fixedly installed above the frame, a drive shaft mounted on the bearing seat, the variable frequency motor and the drive shaft connected by a drive belt device, a grinding cylinder fixedly mounted on the bearing seat by grinding cylinder fixing bolts, and an end cap fixedly mounted on the other end of the grinding cylinder by end cap fixing bolts. The bearing seat, grinding cylinder and end cap form a sealed grinding chamber, in which a grinding disc, a conical spacer and a rotor are arranged. The conical spacer is a spacer with a tapered structure. The grinding disc and the conical spacer are mounted on the drive shaft, and the rotor is mounted at the farthest end of the drive shaft. The stirring device composed of the grinding disc, the conical spacer and the rotor rotates with the drive shaft. This utility model solves the problems of traditional cylindrical spacers not being able to fully utilize the grinding chamber space and having low grinding efficiency, and square spacers having high energy consumption and relatively insufficient uniform mixing ability.