239 results about "Particle packing" patented technology

The invention relates to the technical field of wharf loading and unloading, and discloses a bulk grain wharf ship loading and unloading dual-purpose machine which comprises a conveyor main body and a frame, a discharging hopper is fixedly connected to the top of the conveyor main body, the bottom of the conveyor main body is rotationally connected with the outer wall of the frame, and a supporting frame is rotationally connected to the bottom of the conveyor main body; when a ship needs to be unloaded, a conveying pipeline enters a cabin through a moving assembly, then when a first motor is started to enable a rotating rod to rotate, a connecting rod can be driven to rotate, a concave-convex ring rotates, an extrusion pushing assembly ascends and extrudes gas, and finally high-pressure gas is sprayed out towards grain particles and permeates into gaps of the grain particles to form an air cushion effect; the friction force among grain particles is reduced, the mobility of the grain particles is enhanced, the grains are conveniently conveyed by the spiral auger, the situation that the grains are accumulated at the bottom of the spiral auger due to poor mobility of the grain particles, the grains are extruded and are prone to being damaged is effectively prevented, and the integrity of the grain particles is ensured.

The present invention relates to the field of grinding medium gradation simulation of ball mills. Disclosed is a particle packing theory-based method for grinding medium gradation simulation of a ball mill. The method comprises the following steps: establishing a numerical simulation coordinate system of a ball mill; performing discrete element numerical simulation and modeling on grinding media and material particles; performing periodic boundary modeling on the ball mill, and setting cut-off particle sizes of the material particles; adjusting the cut-off particle sizes of the material particles on the basis of a particle amount in the discrete element numerical simulation model; comparing simulation results of the different cut-off particle sizes to determine a cut-off particle size interval; performing coarse-grained modeling on the material particles in the ball mill, and correspondingly adjusting the width of a periodic boundary; and calculating the grinding effect of the material particles under different grinding medium gradations; and adjusting a particle size gradation of the material particles to obtain an optimal grinding medium gradation design. The optimal grinding medium gradation scheme and the adjusting method under different working conditions obtained according to the present invention can reduce the cement production cost.

The invention relates to the technical field of plastic particle production equipment, and discloses equipment and a method for producing plastic particles, the equipment comprises a water collecting tank, a plurality of spring rods are uniformly and fixedly mounted on the bottom wall of the water collecting tank, a cleaning tank is fixedly mounted among the telescopic ends of the plurality of spring rods, and a door-shaped frame is fixedly mounted at the top end of the cleaning tank. When a first roller rotates, a hook plate is driven to rotate synchronously, when the hook plate rotates to a guide column, the guide column is clamped into an arc-shaped groove formed in the side edge of the hook plate, so that when the hook plate continues to rotate, the whole cleaning box can be pulled downwards through the guide column, a plurality of spring rods supporting the cleaning box are shrunk, and after the hook plate crosses the guide column, the hook plate is clamped into the arc-shaped groove in the side edge of the hook plate. The cleaning box bounces upwards to be reset under the elastic force action of the spring rod, so that the cleaning box can generate longitudinal shaking, plastic particle accumulation is avoided, and the filtering efficiency of the first filtering belt and the second filtering belt on the plastic particles and the plastic particles is improved.

The invention relates to a ternary precursor and a preparation method and application thereof, the chemical general formula of the ternary precursor is [NiaCobMnc] 1-d-e (OH) 2 (SrSO4) d * (Sr (OH) 2) e, 0.8 < = a < 1.0, 0 < b < = 0.2, 0 < c < = 0.2, 0 < = d < = 0.0002, and 0 < = e < = 0.0002; the ternary precursor is sphere-like secondary particles formed by stacking primary particles, the primary particles comprise primary particles A and primary particles B, the thickness of the primary particles A is 50nm-150nm, the length of the primary particles A is 300nm-400nm, the thickness of the primary particles B is 20nm-40nm, the length of the primary particles B is 150nm-250nm, the number ratio of the primary particles A to the primary particles B is 0.2-5, and the number ratio of the primary particles A to the primary particles B is 0.2-5. In any two regions with the same area of the ternary precursor, the standard deviation of the content of the primary particles B is less than 1; the porosity of the ternary precursor is 10-20%, and the sulfur content is less than or equal to 600ppm. The ternary precursor is relatively large in specific surface area, good in morphology uniformity, high in tap density and low in sulfur content, so that the specific discharge capacity and the cycle performance of the lithium ion battery positive electrode material can be improved.

The utility model belongs to the technical field of coating filtering, and particularly relates to coating filtering treatment equipment which comprises a placement barrel, a fixing ring is fixedly connected to the outer circular wall of the placing barrel; the bottom end of the fixing ring is fixedly connected with a group of supporting legs; the top end of the placing barrel is fixedly connected with a connecting pipe; the top end of the connecting pipe is fixedly connected with a filtering barrel; a filter plate is arranged in the filter barrel; the top end of the filter plate is rotationally connected with a group of connecting plates; one side of each connecting plate is fixedly connected with a right-angle plate. A collecting frame is arranged on one side of each connecting plate, so that the defects in the prior art are overcome, and the problems that when a coating filtering device filters a coating, the coating carries some large particles, an existing filtering device cannot treat the particles, the particles are accumulated on the filtering plates and block the filtering plates, and the filtering effect is poor are solved. Therefore, not only is the filtering effect of the filtering plate reduced, but also the problem that internal mechanical equipment is gradually abraded due to excessive pressure of the equipment is solved.

The utility model relates to the technical field of plastic drying, and discloses a plastic particle drying structure which comprises a drying box and supporting legs fixedly installed on the wall face of the bottom of the drying box, a heating mechanism capable of conducting drying is arranged in the drying box, and the heating mechanism comprises a heating disc and an air inlet pipeline. The upper side wall face of the drying box is in sealed connection with a feeding hopper capable of conducting material injection, a driving motor capable of conducting transmission is arranged on the top wall face of the drying box, the output end of the driving motor is in transmission connection with a connecting rotating rod, and the connecting rotating rod is rotationally installed on the top wall face of the drying box. During use, materials are injected into the drying barrel through a feeding hopper, plastic products can be dried through a heating mechanism, meanwhile, a driving motor is started, a connecting rotating rod starts to rotate, a connecting rod drives the drying barrel to rotate, and the drying barrel drives plastic particles in the drying barrel to move; and the gelatinization phenomenon caused by accumulation of plastic particles can be avoided, and the product quality is improved.

The invention relates to the technical field of heat storage and energy conservation, and provides a moving bed high-temperature particle flow and heat transfer characteristic simulation and prediction method and system based on deep learning and electronic equipment. The method comprises the steps that high-temperature particle flow characteristic numerical simulation is conducted, and a three-dimensional moving bed high-temperature particle flow numerical model is established; simulating association of a bed structure, particle properties and particle accumulation and flow pattern rules, and establishing a particle distribution regulation and control strategy; performing numerical simulation on heat transfer characteristics of high-temperature particles, establishing association between particle flow characteristics and a temperature field, simulating a gas-solid two-phase composite heat transfer process of the particles, and establishing a temperature field control strategy; intelligent prediction of particle distribution and a temperature field is carried out, intelligent prediction of particle distribution and the temperature field at a specific moment is realized based on deep learning, and a regulation strategy based on numerical simulation is optimized. The particle flow and heat exchange characteristics of the moving bed are clarified, a theoretical support and a technical solution are provided for improving the waste heat recovery efficiency of the blast furnace slag, and the energy utilization rate can be increased.

According to the mullite porous ceramic and the preparation method thereof provided by the invention, solid waste fly ash is used as a raw material, andalusite is introduced as a silicon source regulator, alumina or calcined alumina is used as an aluminum source, and proportioning is carried out according to the chemical composition of near mullite; meanwhile, the structure of the mullite ceramic is regulated and controlled by combining the particle size of the raw material, a compression molding process and segmented sintering preparation. In the process, the preparation of the near-net-size mullite porous ceramic can be effectively realized through particle accumulation and volume expansion accompanied by mullite generation in the sintering process, the sintering shrinkage rate is less than or equal to 1%, the open porosity is more than or equal to 40%, the pore size distribution is unimodal distribution, and the bending strength is gt; and meanwhile, good gas flux is achieved.

The invention provides an AI algorithm for automatically generating a solid-state battery material formula and application, and relates to a solid-state battery material formula generation method, device and equipment, a medium and a product, and relates to the technical field of battery materials. The method comprises the following steps: generating a plurality of initial parameter groups based on a candidate particle size set and a candidate particle number set; obtaining a particle accumulation constraint condition; inputting the plurality of initial parameter groups and the particle accumulation constraint conditions into a constraint layer to obtain a plurality of constrained parameter groups conforming to the particle accumulation constraint conditions; inputting the constrained parameter groups into a battery performance parameter prediction model to obtain battery performance parameters corresponding to the constrained parameter groups; and based on the battery performance parameters corresponding to each constrained parameter group, determining a target parameter group in each constrained parameter group, and generating a solid-state battery positive electrode formula based on the target parameter group. The embodiment of the invention can optimize the positive electrode material system and improve the overall performance of the battery.

The invention discloses a jack-fruit-shaped manganese-rich precursor as well as a preparation method and application thereof. The manganese-rich precursor is of a composite multilevel structure, the composite multilevel structure is three-stage particles, the three-stage particles are composed of first-stage particles and second-stage particles jointly, and the second-stage particles are formed by stacking a plurality of first-stage particles and are of a sphere-like structure; the third-stage particles are formed by stacking a plurality of second-stage particles and are of jack-fruit-shaped structures; the specific surface area SSA of the manganese-rich precursor is larger than or equal to 80 and smaller than or equal to 200 m < 2 > / g, and the tap density TD of the manganese-rich precursor is larger than or equal to 1.3 g / cm < 3 >. The manganese-rich precursor has high specific surface area and high tap density at the same time, the change rule that the specific surface area and tap density of the precursor always present opposite changes is broken, and the positive electrode material end prepared from the precursor has higher capacity.

The invention provides a method and a system for wirelessly monitoring blockage of a filter screen of a dust remover. The method comprises the following steps: irradiating the surface of a filter screen by multi-wavelength laser to collect optical scattering data of particle accumulation, and extracting scattering angle distribution and intensity change characteristics under different wavelengths; collaborative analysis is carried out on a structured sequential sequence of particle accumulation distribution formed by multi-source scattering, a dynamic correlation mode is captured through scattering mode correlation processing, and an abnormal spectrogram fused with multi-wavelength collaboration is constructed; and mapping the data to a filter screen three-dimensional space coordinate to generate particle stacking density three-dimensional distribution data, generating a blockage position and severity level monitoring result according to a density over-threshold value, and pushing the blockage position and severity level monitoring result to a mobile terminal for display. According to the invention, three-dimensional space positioning and real-time grading alarm of the blockage degree of the filter screen are realized, and the maintenance accuracy of the purifier and the user response timeliness are improved.

The invention discloses a ceramic nanofiber membrane and preparation thereof, a catalytic ceramic nanofiber membrane and preparation and application thereof. The preparation method of the ceramic nanofiber membrane comprises the following steps: (1) cleaning a particle accumulation state ceramic membrane support body; (2) spraying the mullite fiber membrane layer slurry on one surface of a supporting body for multiple times by using a spraying method, after each spraying, applying negative pressure to a membrane for a preset time, then drying, and after the last drying, forming a spraying layer on one surface of the supporting body; and (3) sintering the obtained membrane at high temperature to obtain the ceramic nanofiber membrane which is provided with a support body and a mullite fiber membrane layer which is stably attached to one surface of the support body and is of a net-shaped structure formed by staggering and stacking mullite fibers. The catalytic ceramic nanofiber membrane comprises a ceramic nanofiber membrane and a catalyst loaded on the surface of the ceramic nanofiber membrane and in membrane holes. The ceramic nanofiber membrane provided by the invention has the advantages of high porosity, high mechanical strength, high membrane flux and the like, and is beneficial to subsequent catalyst loading and application in water treatment.

The present invention discloses a method for simulating and predicting the maximum packing density of a multi-size particle filling system, comprising: S1, determining characteristic parameters of the filling particles of the filling system; S2, establishing a simulation box and setting an initial packing density; S3, inserting the filling particles into the simulation box to complete initial modeling; S4, reducing the simulation box according to a predetermined ratio to increase the packing density; S5, performing relaxation under the conditions of a microcanonical ensemble; S6, calculating the packing density and the relative overlap change rate of the filling particles; S7, determining whether the relative overlap change rate is greater than a threshold: if so, proceeding to step S8; if not, executing steps S4 to S6 again; S8, calculating the maximum packing density of the system based on the packing density and relative overlap change rate calculated in step S6. The present invention can simulate and predict the maximum packing density of a multi-size particle filling system, provide effective guidance for the filler gradation scheme of the filling system, shorten the product design and development cycle, and reduce costs.

The invention discloses a method for generating a particle accumulation body simulation model of natural three-dimensional shape characteristics of a building material. The method comprises the following steps: step 1, manufacturing a natural particle simulation model; the randomly generated three-dimensional coordinate control points are endowed with natural sphericity and roundness to obtain a natural particle simulation model; 2, making a particle accumulation body simulation model; the natural particle simulation model obtained in the first step is filled into a discrete element block mass, gravity deposition is applied to the discrete element block mass through a discrete element method, and a particle accumulation body simulation model is obtained. A solid foundation is provided for exploring the microscopic geometrical characteristics of the contact particle accumulation body and the macromechanical properties of civil engineering materials, and a new way is provided for efficiently generating a particle accumulation body database with accurate contact information.

The present invention relates to the technical field of hot blast furnaces, and in particular to an air distribution plate expansion structure, comprising an air distribution plate body and a castable layer; the air distribution plate body comprises a first air distribution plate and a second air distribution plate, a first gap is provided between the first air distribution plate and the second air distribution plate, and a sealing assembly for sealing the first gap is provided between the first air distribution plate and the second air distribution plate; the castable layer comprises a first castable layer and a second castable layer respectively provided on the first air distribution plate and the second air distribution plate, a second gap is provided between the first castable layer and the second castable layer; the second gap comprises a transverse gap portion and a vertical gap portion, the ends of the two vertical gap portions are respectively connected to the two ends of the transverse gap portion, and the two vertical gap portions extend to the top and the bottom of the castable layer respectively. The advantage of the present invention is that by arranging the castable layer and the air distribution plate in sections and leaving a gap with a special-shaped cross-section on the castable layer, dust-containing particles are prevented from accumulating and restricting the expansion of the castable layer.

The utility model discloses a device for classifying waste metal after fine crushing treatment, which comprises a base, a mounting frame and a conveying belt, and further comprises a material uniformizing mechanism and a magnetic separation mechanism which are positioned above the conveying belt, and a vibration material distributing mechanism fixed on the base, and the vibration material distributing mechanism comprises a plurality of material distributing grooves; the conveying belt is fixedly connected to the base through the conveying belt fixing frame, and the vibration distributing mechanism is located below a discharging port of the conveying belt. According to the whole structure of the device, efficient and automatic metal sorting is achieved through multiple screening, grading and stable design, and the sorting precision, stability and working efficiency of equipment are greatly improved; the problems that in the prior art, non-magnetic metal and metal particles with small density difference cannot be effectively separated through a single screening mode, and the screening precision is affected by metal particle accumulation are solved.

The present invention discloses a grading method for high-purity ultrafine spherical powder. By mixing raw powders and additive powders with different particle size distributions, a multi-peak distribution of the mixed powder in particles of each particle size level is formed. According to the classical continuous particle packing theory, the present invention rationally matches ultrafine spherical alumina powder and high-purity ultrafine spherical silica powder with different particle size distributions in a specific proportion. Through the ratio, close packing is achieved in a specific particle size region, achieving the effect of high filling rate during application, with the volume fraction being up to more than 90% at most. At the same time, the oil absorption values of the ultrafine spherical alumina powder and the high-purity ultrafine spherical silica powder are also reduced.

Provided in the present application are a sodium-ion battery positive electrode precursor having a core-shell structure, a manufacturing method therefor, and the use thereof. Said precursor comprises a core and a shell on the surface of the core, the core comprising NiaFebMn1-a-b-cMc(OH)2, wherein 0.3≤a≤0.5, 0.2≤b≤0.4 and 0≤c≤0.01, and the shell comprising NixCuyFezMn1-x-y-z-vNv(OH)2, wherein 0.1≤x<0.3, 0.02≤y≤0.2, 0.2≤z≤0.4 and 0≤v≤0.01, and the shell containing pores. In said precursor of the present application, primary particles of the core are of a dense packing while primary particles of the shell are of a loose packing, so that compaction density, energy density, porosity and specific surface area of the material are improved, thus improving properties of the material.

The utility model relates to a swing type granulator which comprises a granulating mechanism, the granulating mechanism comprises a feeding hopper and a discharging hopper, the feeding hopper is communicated with the discharging hopper, the discharging hopper is communicated with a material guide pipe, a material collecting mechanism is arranged at the bottom end of the material guide pipe, the material collecting mechanism comprises a material receiving box, a swing frame and a vibration motor, and the material receiving box is installed on the swing frame. The vibration motor is connected with the swing frame, finished product particles are collected through the material receiving box, the vibration motor drives the swing frame to vibrate, vibration force is transmitted to the material receiving box, the particles accumulated in the material receiving box are flatly laid in the material receiving box under the action of the vibration force, and the situation that the material guiding pipe is blocked due to particle accumulation is avoided; therefore, the stacked particles do not need to be manually bulldozed, and the working intensity of workers is reduced.

The invention belongs to the technical field of lithium batteries, and relates to a material particle size grading optimization method and system based on a genetic algorithm and discrete element simulation. The method comprises the following steps: carrying out particle size distribution test on a material to be optimized to obtain a particle size distribution result as an optimizable particle size range; carrying out three-component peak separation on the obtained particle size distribution result, and approximately representing the particle size distribution of the material through three-component spherical particles; optimizing the stacking density of the three-component spherical particles in an optimizable particle size range by utilizing a genetic algorithm, and enabling the optimized stacking density of the three-component spherical particles to be approximate to the compaction density of the three-component spherical particles; obtaining physical property data of the material; and carrying out simulation verification on the compaction density of the three-component spherical particles obtained by optimization by using a discrete element model according to physical property data of a material. According to the method, optimization design is carried out on the particle size of the material based on discrete element analog simulation and a genetic optimization algorithm, and the large and small particle gradation of the high-compaction-density material can be rapidly screened.

The invention relates to an energy-absorbing metal ceramic composite particle stack and a preparation method thereof, the composite particle stack comprises superelastic ceramic particles CexZr (1-x) O2 and metal particles M, and the component expression is y% M (at) (100-y)% CexZr (1-x) O2, wherein the particle size of the superelastic ceramic particles is 1-10 [mu] m; the metal particles M are one of Cu, Al, Ti, Ni or alloy, and the particle size is 0.5-5 [mu] m; in the component expression, x is an atom molar ratio, and x is more than or equal to 0.14 and less than or equal to 0.18; y is the mass ratio, and 5 < = y < = 45. The metal ceramic composite particle stack is formed by dispersing superelastic ceramic particles and metal particles through a solvent, drying, stacking and pre-pressing the superelastic ceramic particles and the metal particles. The metal ceramic composite particle accumulation provided by the invention has excellent compressive strength, energy dissipation density and cycling stability, the preparation process is energy-saving and time-saving, and the metal ceramic composite particle accumulation has wide application in the fields of damping, shock absorption, energy absorption and the like.

The invention discloses a control method for preventing material blockage of an alloy gate valve, which belongs to the technical field of material conveying and comprises the following steps: S1, optimizing dynamic parameters of a gate, including regulating the length of the gate and controlling the inclination angle; s2, optimizing an opening and closing action process, including stroke subsection control and vibration-assisted material cleaning; s3, the sealing surface is self-cleaned through the periodic maintenance action; the periodic maintenance action comprises the step of executing full-stroke cleaning once after 10 opening and closing cycles are completed every time, material retention in the gate valve can be reduced, blockage caused by particle accumulation is effectively prevented, the accuracy and the sealing performance of the opening and closing action of the gate valve are improved, and meanwhile the shutdown maintenance frequency caused by material blockage is reduced.

The invention discloses a synthesis method of a high-power anti-water-absorption phosphate positive electrode material, which comprises the following steps of: performing micro-nanocrystallization on a precursor, uniformly dispersing by sanding on the basis, fully refining the precursor, a carbon source and a lithium source in a liquid phase system by sanding, and realizing highly uniform contact, thereby obtaining the high-power anti-water-absorption phosphate positive electrode material. The carbon source can uniformly coat the surfaces of the particles and be embedded on the interfaces, so that the particles are in contact with channels and form a continuous conductive phase after heat treatment, and the uniformly compounded primary particles are compactly packaged into a spherical secondary structure through spray drying and secondary granulation, so that the exposed specific surface area is reduced, and an internal conductive contact network is locked; therefore, pulping viscosity fluctuation and gelation risks caused by moisture adsorption and abnormal solvent adsorption are inhibited, an internal conductive network and particle accumulation morphology are locked, and finally, synergistic improvement of conductivity, water absorption resistance and processing consistency is realized.

The invention discloses a coal particle sampling device capable of movably intercepting and sampling, and relates to the technical field of coal optionality. Comprising a supporting stand column, a supporting transverse plate fixedly arranged at the top of the supporting stand column, a collecting supporting plate fixedly arranged on one side of the supporting stand column and multiple sets of sampling and collecting bins horizontally arranged at the top of the collecting supporting plate at intervals. And a second driving motor is arranged above the supporting transverse plate, and the output end of the second driving motor is connected with a rotating rod part. According to the sampling device disclosed by the invention, the two groups of sampling baffle blocks which are inclined inwards are arranged below the sampling handrails, so that the distance between the two groups of sampling handrails is larger than particles, and the distance between the bottoms of the two groups of sampling baffle blocks is smaller than the sizes of the particles, so that the particles are arranged between the two groups of sampling baffle blocks and the two groups of sampling handrails; other coal particles can fall down from the two sides along the sampling handrails, the situation that the coal particles are accumulated is avoided, the distance between the two sets of sampling handrails can be adjusted, and therefore sampling of the coal particles with different particle sizes can be achieved.

The invention relates to an outdoor particle furnace and belongs to the field of outdoor devices. The outdoor particle furnace comprises a furnace body, a rotating plate and a rotating mechanism. The rotating plate is arranged in the furnace body so as to divide the furnace body into a combustion cavity and a containing cavity which are arranged in the gravity direction, and a protrusion is arranged on the side, facing the combustion cavity, of the rotating plate; the rotating mechanism is at least partially arranged in the containing cavity, and the rotating mechanism is used for driving the rotating plate to rotate so as to drive the protrusions to stir the granular comburent; the rotating mechanism drives the rotating plate to rotate so as to drive the protrusions, located in the combustion cavity, of the rotating plate to rotate, so that particles are stirred to be looser, the particles can be more evenly distributed, later-added particles are prevented from being accumulated at the same position, the particles can be evenly combusted, and the contact area of the particles and air is increased; therefore, sufficient combustion of the particles is facilitated.

The invention discloses a method and a system for forming an elliptical particle accumulation body, which are applied to the technical field of geotechnical engineering and material science, and the method comprises the following steps: defining a space boundary and a calculation rule; generating bottom-layer elliptical particles according to a placement sequence from left to right, and placing the bottom-layer elliptical particles: determining an arc section in contact with a boundary line of the container, and determining the center of the first bottom-layer elliptical particle based on translation and offset calculation of a left boundary and a lower boundary; bottom-layer elliptical particles are randomly generated, the bottom-layer elliptical particles and the previous elliptical particles form an invasion block, and based on line segment information after the lower boundary and the right boundary of the container are shifted, putting judgment of the bottom-layer elliptical particles is carried out; and generating and placing upper-layer elliptical particles: randomly generating the upper-layer elliptical particles, traversing a current accumulation body surface layer elliptical particle set to form a corresponding invasion block body, and carrying out putting judgment on the upper-layer elliptical particles based on line segment information after the left boundary, the right boundary and the upper boundary of the container are shifted. According to the invention, the generation of the elliptical particle accumulation body with high density and low porosity is realized.

The invention belongs to the technical field of 3D printing concrete materials, and particularly relates to 3D printing waste glass recycled lightweight aggregate concrete and a preparation method thereof. The concrete is prepared from the following raw materials: cement, silica fume, fine aggregate, waste glass recycled lightweight aggregate, a viscosity modifier, nano silicon dioxide, nano cellulose fibers, a water reducing agent, fly ash, a defoaming agent and water. The lightweight 3D printing concrete with different densities is prepared by replacing sand with the lightweight aggregate prepared by recycling the waste glass, the tackifier, the thixotropic agent, the nano-crystalline cellulose fiber, the water reducer and the fly ash are used for competitive synergistic effect to improve the water-retaining property and the rheological property, a nano-micron multi-scale synergistic system is constructed, multi-stage particle accumulation is effectively realized, and the 3D printing concrete with different densities is prepared. The problems that the constructability is difficult to improve while the density of conventional 3D printing lightweight aggregate concrete is reduced and the lightweight aggregate of low-density 3D printing concrete floats upwards are solved, the printable window time is prolonged, and the interface performance of an aggregate matrix is enhanced.

The present invention belongs to the technical field of oil and gas production and provides a method for establishing a clay model and an online testing method for the performance of a sand screen model. The method for establishing a clay model includes establishing agglomerate base particles formed by connecting at least two clay base models; adding a preset size of adsorption viscosity on the surface of the agglomerate base particles; piling up a number of agglomerate base particles to form a pure clay model; wherein the connection force between the clay base models in the agglomerate base particles is greater than the adsorption viscosity on the surface of the agglomerate base particles. The present invention uses the agglomerate base particles as the most basic particles in the clay model to form a large agglomerate with a larger size and richer morphology, thereby better simulating and restoring the mechanical morphology of clay particles when agglomerating and dispersing when the clay model moves, so that the movement of the clay model is more in line with the actual situation.

The invention relates to an intelligent impact tendency evaluation method based on multitask gating mechanism coal, which belongs to the technical field of crossing of electric digital data processing and geological engineering, and comprises the following steps of: 1, collecting related data, and constructing a data set; 2, training a coal body impact tendency intelligent evaluation model based on multi-task learning by using the constructed data set, so that the model learns nonlinear mapping of a coal body microstructure and macroscopic mechanical properties; and 3, inputting particle accumulation and joint structure information of to-be-detected coal into the model trained in the step 2, carrying out regression analysis to obtain a coal impact tendency index, and judging the coal impact tendency according to a standard. According to the method, a low-cost and high-reliability intelligent solution is provided for mine dynamic disaster prevention and control, and the method has technical innovation and engineering application value.

The invention belongs to the technical field of ice cream production, and discloses a particle plane spreading device which comprises a rack, a rotary drum, a material taking assembly and a material guiding assembly, a material collecting groove is formed in the rack, and particles are contained in the material collecting groove; the rotary drum is provided with a feeding hole and a discharging hole, and the feeding hole is communicated with the material collecting groove; the material taking assembly is rotationally arranged in the rotary drum and is used for taking and feeding materials; the material guiding assembly comprises an elastic piece and a vibration driving piece, and the vibration driving piece is configured to drive the elastic piece to vibrate so that the particles can bounce from the elastic piece and be scattered through the discharging opening. Automatic rotating material taking and feeding are achieved, and the particle taking precision and speed are improved; compared with the prior art, the influence of the particle size on the plane scattering uniformity is avoided, no particles are accumulated on the scattering surface, plane scattering of particles of multiple sizes can be achieved at the same time, and the plane scattering precision and efficiency of the particles are improved.