99 results about "Particle packing" patented technology

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 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 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 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 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 sorting device for modified plastic production comprises a main machine body, fixing plates are fixedly installed on the two sides of the inner wall of the main machine body, a movable frame is installed between the two sets of fixing plates, two sets of connecting plates are symmetrically and fixedly installed on the two sides of the movable frame, and the four sets of connecting plates are in sliding connection with the two sets of fixing plates respectively. And telescopic rods are fixedly installed at the four corners of the top side of the movable frame, and the top ends of the four sets of telescopic rods are jointly and fixedly connected with a sieve plate. The connecting rods can be driven to move flexibly through the cooperation of the driving motor and the rotating disc, the movable frame can be driven to move flexibly through the cooperation of the connecting rods and the connecting pins, and the sieve plate can move in the horizontal direction and the vertical direction at the same time through the cooperation of the telescopic rods, the sliding rods and the guide grooves. And low sorting efficiency caused by accumulation of the plastic particles at one position is avoided, and the production efficiency of products is improved.

The invention belongs to the technical field of electroacoustics, and particularly relates to a sound production device and electronic equipment, the sound production device comprises a shell, a sound production monomer and a breathable separator, the sound production monomer and the breathable separator are arranged in the shell, the sound production monomer is matched with the shell to define a front sound cavity and a rear sound cavity in the shell, and the rear sound cavity is filled with a sound absorbing material; the breathable separator is used for isolating the sound-absorbing material and the sound-producing monomer, the sound-absorbing material comprises first molecular sieve powder particles with the average particle size of 10-50 microns and sound-absorbing particles with the average particle size of 150-1000 microns, and the sound-absorbing particles are sphere-like particles formed by bonding a plurality of second molecular sieve powder particles; and the air-permeable aperture of the air-permeable separator is smaller than the minimum particle size of the first molecular sieve powder particles. According to the invention, the first molecular sieve powder particles can be filled in the narrow space of the rear sound cavity and the gaps where the sound-absorbing particles are stacked, so that the filling amount of the sound-absorbing material in the rear sound cavity is increased, the resonant frequency of the sound production device is effectively reduced, and the low-frequency acoustic performance of the sound production device is improved.

This invention discloses a centrifugal pump impeller structure for preventing clogging of chemical media containing solid particles, relating to the technical field of centrifugal pump impeller structures. It includes a centrifugal pump body with a pump chamber and an inlet and outlet chamber communicating with it. Adjustment chambers communicating with the outlet chamber are provided on both outer walls of the centrifugal pump body. A rotating shaft is rotatably mounted on the centrifugal pump body along the axis of the adjustment chamber. A double-suction impeller located within the pump chamber is detachably mounted on the rotating shaft. The double-suction impeller has multiple spirally arranged blades, with inlet channels for media passage formed between adjacent blades. By providing cylindrical protrusions on both sides of the double-suction impeller, and using a first air nozzle corresponding to the inlet channel and a second air nozzle corresponding to the outlet channel, along with a purging component to deliver high-pressure gas, active purging of the inlet and outlet channels is achieved. This allows for real-time cleaning of solid particle deposits on the blade surface, inlet and outlet channels, and in the gaps, preventing impeller clogging.

The utility model discloses a kind of noble metal drying devices, it is related to noble metal processing technical field, including support column, drying cabinet, door, vibration mechanism being set on drying cabinet, first sieve basket, second sieve basket, third sieve basket, fixing frame, fixed mechanism being set on fixing frame, rotating mechanism being set on drying cabinet, knock key, support plate, heating mechanism being set on support plate;Through the cooperation between vibration mechanism, first sieve basket, second sieve basket, third sieve basket, rotating mechanism, knock key and heating mechanism, rotating mechanism drives knock key to impact vibration mechanism constantly, so that vibration mechanism drives first sieve basket, second sieve basket and third sieve basket vibrate constantly, to realize the step-by-step screening of different particle size noble metal particles, avoid particle accumulation, simultaneously promote noble metal particles even heat by continuous vibration, significantly improve drying efficiency and effect.

This invention relates to a closed-loop control method and system for improving the compaction density of LFP electrodes. The method involves real-time acquisition of images of the micro-particle packing of the coating slurry, synchronized with the rolling mill operation data; extraction of micro-pore distribution features from the images, establishing a mapping relationship between these features and the material's fractional-order constitutive parameters; combining real-time rolling pressure and roll gap data, obtaining the equivalent fractional-order derivative order and rheological viscosity of the electrode material through rapid inversion calculation; inputting the viscoelastic properties into a physically constrained recurrent neural network to predict the full-cycle thickness evolution curve of the electrode, including elastic rebound, creep, and relaxation processes, and calculating the predicted compaction density based on the steady-state value of the curve; constructing a planning model with the goal of minimizing the residual between the predicted density and the set target, and jointly optimizing the roll gap position compensation and hot roller heating power online to achieve closed-loop control of the compaction density.

The utility model relates to the technical field of plastic particle packing, in particular to a damp-proof plastic particle packing device for regeneration. According to the technical scheme, the device comprises a base, a containing barrel and a sealing plate, a fixing frame is fixedly installed on the upper surface of the containing barrel, a first hydraulic cylinder and a vacuum pump are fixedly installed on the upper surface of the fixing frame, the sealing plate is fixedly connected to the output end of the first hydraulic cylinder, and air cylinders are symmetrically and fixedly installed at the positions, close to the two sides of the upper surface, of the outer surface of the containing barrel; the output ends of the two air cylinders are fixedly connected with hollow plates, adsorption holes are formed in the inner sides of the two hollow plates, and ultrasonic sealing plates are fixedly installed at the positions, below the adsorption holes, of the inner sides of the two hollow plates. The reprocessed plastic particle vacuum packaging device facilitates vacuum packaging of reprocessed plastic particles, so that the sealing performance is improved, the reprocessed plastic particles are prevented from being contaminated by moisture due to damp, and the quality and later use of the reprocessed plastic particles are guaranteed.

The application provides an experimental device and method for formation dissolution in carbon dioxide geological storage. The device comprises: a visualized autoclave system, including an autoclave with a first visualized transparent window; a double-continuous-phase particle accumulation experimental model placed in the autoclave opposite to the first visualized transparent window, which comprises: a Hele-Shaw glass model, a double-continuous-phase suspension accommodated in the Hele-Shaw glass model, which is prepared by mixing a saturated solution of an alkaline calcium compound with a set amount of water-insoluble calcium salt, and inert particles uniformly accumulated in the double-continuous-phase suspension; a carbon dioxide injection system for injecting carbon dioxide gas into the autoclave in a set manner; and an information acquisition and regulation system for acquiring environmental parameters in the autoclave and image information of the double-continuous-phase particle accumulation experimental model during the formation dissolution experiment. The carbon dioxide storage in a saline aquifer and the formation dissolution process can be simulated and visually monitored under experimental conditions.

The utility model relates to an ore pulp production system which comprises a raw material bin, a crushing unit and a grinding unit are arranged on the downstream of the raw material bin in parallel, and a sorting unit is arranged on the downstream of the crushing unit; the crushing unit is used for crushing part of ore in the raw material bin, and the sorting unit is used for sorting crushed powder; and the grinding unit is used for grinding the sorted super-large particles and the ores in the raw material bin, converging the ground superfine slurry and the sorted medium and large particles and introducing the mixture into the kneading machine. According to the slurry prepared by the ore pulp production system, the particle size distribution of non-metal ore pulp can be changed, the flowability and pulping concentration of the ore pulp can be improved, the proportion of large particles and superfine particles in the ore pulp can be increased, and meanwhile, the particle stacking density can be improved.

This invention relates to a three-dimensional coupled heat transfer calculation method and system for granular phase change heat accumulators, encompassing the field of phase change heat accumulators. The method includes: constructing a one-dimensional heat transfer model of the interior of each phase change particle in the heat accumulator; obtaining the simulated particle packing morphology using the discrete element method (DEM); analyzing this result to extract the particle ID, 3D coordinates of the sphere's center, and radius parameters; generating particle geometric entities based on the 3D coordinates and radius parameters of each particle's center, and simultaneously generating the tank geometric entity of the heat accumulator, thus obtaining a three-dimensional flow field calculation domain model of the fluid domain; naming each spherical orifice in the three-dimensional flow field calculation domain model according to the particle ID and importing it into CFD software for mesh generation; solving the one-dimensional heat transfer model and the solver independently for each particle, with the solver solving the meshed three-dimensional flow field calculation domain model and the one-dimensional heat transfer model solving the phase change heat transfer process inside the particle, achieving coupling through data exchange on the particle's outer wall surface. This invention significantly improves computational efficiency while effectively ensuring computational accuracy.

The application belongs to the technical field of mineral castings, and discloses a mineral casting batching equipment, which comprises a supporting seat, a batching equipment is linearly and equidistantly fixedly connected to the top of the supporting seat, a screening plate is fixedly connected to the inside of the batching equipment, fixed blocks are fixedly connected to the four corners of the screening plate, a protective pad is fixedly connected to one side of the fixed blocks, and a sliding rod is movably connected to the middle of the protective pad. The batching equipment is not prone to batching particle accumulation in the screening process of the screening plate, and the flowability of the screening plate is improved through the cooperation of the sliding rod, the scraping plate, the first push rod, the baffle and other structures. The first push rod is pushed and moved along the limiting sliding groove, the sliding ring moves the fixed plate through the first push rod, the fixed plate moves the scraping plate, the surface of the screening plate can clean the batching particle accumulation, the screening plate is not prone to blockage, the flowability of the screening plate is improved, and the normal use of the batching equipment can be ensured.

This application discloses a method for preparing high-strength and high-toughness ZTA ceramics from multi-graded powder, relating to the field of structural ceramic preparation technology. The method includes: preparing raw materials by mixing four-particle-graded ZTA-based powder, yttrium oxide-cerium dioxide composite sintering aid, DMAA gel system, dispersant, initiator, and deionized water in parts by mass; followed by powder pretreatment, gel slurry preparation, casting and curing, degreasing treatment, and three-stage pressureless sintering to obtain the finished ZTA ceramic product. This application achieves close particle packing through a four-particle-graded structure based on the Dingle model, achieves uniform molding using a low-toxicity DMAA gel system, and controls grain growth through a three-stage sintering process, ultimately obtaining high-strength and high-toughness ZTA ceramics suitable for waste incineration power generation, biomedicine, semiconductor packaging, and other fields.

This invention proposes a three-dimensional electrode electrochemical device with descaling function. It is divided into a softening chamber and an oxidation chamber by a partition. The softening chamber contains multiple cylindrical electrode groups. Under the action of an external electric field, the cathode reaction generates a strongly alkaline environment to precipitate scale-forming ions in the water. A gas flushing mechanism and an external programmable DC regulated power supply effectively achieve automatic descaling. The three-dimensional electrode group in the oxidation chamber consists of several anode plates and cathode plates arranged alternately at equal intervals. Insulating baskets filled with particle packing are placed between adjacent electrode plates. Ultrasonic vibrating plates are integrated around the three-dimensional electrode group. A porous sieve plate and aeration pipeline are installed at the bottom of the three-dimensional electrode group. A spray mechanism with rotating nozzles is installed at the top of the oxidation chamber. The combination of the three-dimensional electrode group, ultrasonic assistance, and circulating spray enhances the oxidation efficiency. This invention removes multiple pollutants from water simultaneously and efficiently in a single reactor without the need for external reagents, through a series of electrochemical reactions. It has the advantages of high treatment efficiency, high automation, and small footprint.

This invention provides a non-contact testing device and method for coarse-particle packing vibration compaction, relating to the field of geotechnical engineering technology. The device includes a transparent test cylinder apparatus, a compactor, and a monitoring device. The transparent test cylinder apparatus comprises a base plate, a pad plate, and a cylinder body connected in sequence. The base plate is fixedly mounted on a workbench, and the cylinder body is mounted on the base plate. The cylinder body has a hollow cylindrical structure and is filled with a transparent soil sample. The cylinder wall includes transparent and non-transparent areas. The pad plate is positioned between the base plate and the cylinder body. The compactor is positioned above the cylinder body, with its hammering direction pointing towards the center of the compaction cylinder. The monitoring device measures through the transparent area of ​​the cylinder towards the transparent soil sample. The monitoring device includes a binocular industrial camera and an infrared moisture meter. The compactor-cylinder apparatus proposed in this invention effectively solves the problem that traditional test cylinders cannot observe the particle size distribution reorganization and pore structure evolution processes during compaction.

The invention relates to the technical field of battery material preparation, and discloses a ternary precursor and a preparation method thereof, and a positive electrode material and application thereof. The chemical formula of the ternary precursor is Ni < x > Co < y > Mn < z > M < a + b > (OH) < 2 >, and x < lt > is larger than or equal to 0.80; 1, 0 < = y < lt >; 0.1, 0 < = zlt; 0 < = a + b < 0.01, and x + y + z + a + b = 1; m comprises Pb and Sr; the ternary precursor particles are secondary particles formed by stacking strip-shaped primary particles, and each ternary precursor particle comprises a core part located in the interior and a shell part wrapping the core part; the porosity of the core part is 5-12%, and Pb is doped in the core part; the porosity of the shell part is 12-30%, and Sr is doped in the shell part; and the D50 of the ternary precursor is 8-11 [mu] m. The precursor has better electrochemical performance.

The utility model relates to the technical field of plastic particle mixing, in particular to a plastic particle hot melting mixing device which comprises a double-helix mixing conveying mechanism and a mixing barrel arranged at the input end of the double-helix mixing conveying mechanism in a communicated mode, and further comprises a material mixing unit and an intermittent discharging assembly. A stirring piece used for preliminarily mixing at least two plastic particles entering the mixing barrel is arranged in the mixing barrel, and the intermittent discharging assembly is located between the mixing barrel and the mixing barrel and used for controlling the output end of the mixing barrel to synchronously and intermittently discharge materials into the mixing barrel. According to the utility model, a plurality of plastic particles are respectively and randomly matched and put into the mixing barrels, the plastic particles in each mixing barrel are preliminarily stirred and mixed through the stirring piece, and the preliminary mixed materials in each mixing barrel are synchronously released into the mixing barrels in a small amount and multiple times through the intermittent blanking assembly; plastic particle accumulation caused by continuous discharging is avoided, and the uniform mixing efficiency is improved through a small number of plastic particles.

The application discloses a kind of experimental device of powder particle packing gradation characterization, device is equipped with the loading material container of upper opening, the air-permeable sheet is equipped in the loading material container, the air-permeable sheet is densely covered with air-permeable round hole, the bottom of the loading material container is communicated with the top of connecting pipe, the bottom end of the connecting pipe is connected with the one end of U-shaped tube, the U-shaped tube is equipped with mark line on the pipe wall of one side of connecting pipe, the connecting pipe is equipped with valve three-way pipe, the valve three-way pipe is connected with vacuum pump in main machine by bypass connection.The application obtains the gradation index of powder particle packing by detecting the time of a certain amount of gas crossing the compacted powder particle packing pore layer by layer, calculating the ratio of the increasing time of gas permeating powder particle packing structure and the increasing thickness layer by layer, taking the arithmetic average of each layer ratio, reflecting the gradation state of real accumulation of powder particle.

The utility model discloses a kind of plastic particle screening devices, it is related to plastic particle screening technical field, including screening box, the inside of screening box is provided with vibrating discharge mechanism, vibrating discharge mechanism includes support plate.The utility model is through the setting of vibrating discharge mechanism, can reach the vibration of screening plate, with the effect of large particle plastics discharging, in use process, it can avoid because relatively difficult to vibrate screening plate, and lead to some large particle plastics to the through-hole on screening plate block, simultaneously when the number of plastic particles is more, make plastic particles accumulate on screening plate, make the situation that screening plate cannot normally screen plastic particles appear, guarantee the screening efficiency of the device, also avoid because relatively difficult to discharge screening out large particle plastics, and lead to need manual to screen out large particle plastics, make discharging consume relatively long time situation appear, guarantee the practicability of the device.

The invention provides a positive electrode precursor and a preparation method and application thereof. An eccentric closed cavity or a concentric closed cavity is formed in the positive electrode precursor, the positive electrode precursor further comprises a solid shell wrapping the closed cavity, and the solid shell is formed by stacking primary particles; the thickness of the primary particles is gradually increased in the radial direction from the inner wall of the closed cavity to the outer surface of the solid shell. The invention provides a positive electrode precursor with an internal closed cavity structure and a solid shell, wherein the solid shell layer is formed by closely packing primary particles; the positive electrode material prepared from the positive electrode precursor can still keep an internal closed cavity, so that the structural stability of the positive electrode material can be maintained, and a lithium ion transmission path is shortened, thereby solving the contradiction between high power and long service life and ensuring the safety of the battery.

The utility model relates to the technical field of drainage mechanisms, in particular to a drainage mechanism of an underpass tunnel, which comprises a drainage shell and a water storage shell. The floating bag moves upwards under the buoyancy of water, then the sliding block drives the first positioning rod and the second positioning rod to move upwards through the fixing plate, at the moment, the second positioning rod slides upwards on the inner wall of the limiting sleeve, and when the first positioning rod pushes the first shell out, the second positioning rod drives the second shell to move upwards, so that the first shell is pushed out. The height of the second shell is relatively high, and the surface of the second shell is coated with a warning coating, so that pedestrians can be reminded; solid particles are blocked by a stop block, then the fixed particles are accumulated on one side of the stop block, a floating bag floats upwards, then a first positioning rod pushes a first shell out of an inner cavity of a water storage shell through a limiting sleeve, and at the moment, floating impurities brought by water flow can float out of the water storage shell; the controller controls the water suction pump to pump out water in the inner cavity of the water storage shell, and the practicability is better.

The application discloses a carbonate rock powder-based mineral admixture and a preparation method thereof, and relates to the technical field of mineral compositions; the carbonate rock powder-based mineral admixture comprises the following components in proportion by weight: 50-60 parts of carbonate rock powder, 30-40 parts of biomass ash and 10 parts of red mud; the three kinds of bulk solid wastes, i.e., the carbonate rock powder, the biomass ash and the red mud, are compounded, the inherent defects of single carbonate rock powder in the application in concrete are successfully solved, and high-quality and bulk-quantity utilization of multi-source solid wastes are realized; based on the physical and chemical synergistic effect among the components, tight particle packing is realized, when the carbonate rock powder-based mineral admixture is applied in concrete, not only the workability of fresh concrete is ensured, but also the hardened concrete structure is extremely dense, and the mechanical strength, the impermeability, the corrosion resistance and other durability of the hardened concrete structure are improved.

The application provides a high-thermal-conductivity heating element and a preparation method thereof. The high-thermal-conductivity heating element is prepared from first black silicon carbide powder, second black silicon carbide powder, flaky graphite, polyvinyl alcohol aqueous solution and a small amount of high-thermal-conductivity MgO sintering aid. The particle sizes of the first black silicon carbide powder and the second black silicon carbide powder are different, and the particle size ratio of the first black silicon carbide powder and the second black silicon carbide powder satisfies the Horsfield filling relationship. The application uses two silicon carbide powder raw materials with different particle size distributions, so that the D50 index satisfies the Horsfield filling relationship, the small-particle-size silicon carbide powder can be filled in the gaps formed by the particle accumulation of the large-particle-size silicon carbide powder, the forming density of the pressed silicon carbide heating sheet blank is improved, the requirement for realizing the densification of the heating sheet through the shrinkage of the later high-temperature sintering is reduced, the sintering temperature is reduced, and the loss of the flaky graphite in the sintering process is avoided.

The invention provides a multi-core cable and an extrusion molding device for production thereof, and belongs to the technical field of cable production. Comprising an extrusion box, a feeding assembly and an extrusion head, the feeding assembly is arranged on one side of the extrusion box, the extrusion head is arranged on the other side of the extrusion box, the feeding assembly comprises a feeding barrel and an extension barrel, the extension barrel is arranged on the upper surface of the feeding barrel and communicates with the feeding barrel, and two second air cylinders are vertically and symmetrically installed on the upper surface of the extension barrel; a first air cylinder is horizontally installed between the two second air cylinders, a feeding pipe is installed on the outer wall of the feeding barrel, the telescopic end of the first air cylinder is fixedly connected with a sliding block, a driving rod is installed on the side of the sliding block in a threaded mode, and the driving rod vertically penetrates into the extending barrel from the upper surface of the extending barrel. According to the plastic particle screening device, the sliding block, the driving rod and other components are driven by the first air cylinder, so that the screen shakes in the fixing frame, the mutual stacking and blocking state among plastic particles is broken through the shaking design, the screening efficiency is improved, and the problem that the screening speed is low due to particle stacking is solved.

The application discloses a method and system for forming an elliptical particle accumulation body, and applies to the fields of geotechnical engineering and material science technology, and comprises the following steps: defining a space boundary and a calculation rule; generating and placing bottom-layer elliptical particles in a left-to-right placement order: determining a circular arc segment in contact with a container boundary line, and determining the center of a first bottom-layer elliptical particle based on translation and offset calculation of a left boundary and a lower boundary; randomly generating a bottom-layer elliptical particle, forming an intrusion block with a previous elliptical particle, and performing placement judgment of the bottom-layer elliptical particle based on line segment information after offset of the lower boundary and the right boundary of the container; generating and placing upper-layer elliptical particles: randomly generating an upper-layer elliptical particle, traversing a current accumulation body surface elliptical particle set to form a corresponding intrusion block, and performing placement judgment of the upper-layer elliptical particle based on line segment information after offset of the left boundary, the right boundary and the upper boundary of the container. The application realizes generation of an elliptical particle accumulation body with high density and low porosity.

This invention relates to the field of 3D printing technology, specifically to a method for generating 3D printed slices applicable to large-scale particle packing structures with small particle sizes. The method includes the following steps: inputting three-dimensional particle structure data; extracting the three-dimensional particle structure data using a multi-source coordinate extraction module to obtain the centroid coordinates and diameter; drawing slice images layer by layer based on the centroid coordinates and diameter data; performing grayscale adjustment processing on the slice images; and outputting a complete slice image sequence based on the grayscale-adjusted slice images. This invention employs an external, independent slicing process, completely replacing the printer's built-in onboard slicing program. By combining multi-source coordinate extraction and grayscale adjustment mechanisms, this invention effectively solves the clogging problem that easily occurs during the printing of small-diameter particle packing structures with pores, and addresses the technical deficiency of existing onboard slicing programs that cannot complete slicing due to excessive memory usage when processing small-diameter, large-scale packed particle models.