50 results about "Grain shape" patented technology

The invention discloses a corn kernel size regulation gene X1 as well as an SNP (Single Nucleotide Polymorphism) marker and application thereof. The invention discovers that the X1 gene has the function of regulating and controlling the grain shape and the grain weight for the first time. The invention provides a novel SNP (Single Nucleotide Polymorphism) marker related to the corn grain size, the SNP marker has two alleles AA and GG, and the allele AA is clear to be regarded as an excellent / synergistic allele. The X1 gene provided by the invention can lead to increase of grain types such as the length of a corn grain of a mutant strain compared with that of a control grain; the length and other grain types of the X1 gene overexpression strain are reduced compared with those of the control grain. Precious gene resources are provided for corn breeding, and the application prospect is wide.

Disclosed are a MAX-Ag conductive composite coating and a preparation method therefor. The conductive composite coating comprises a MAX phase and an Ag phase. The chemical formula of the MAX phase is Mn+1AXn, where M is a transition metal element, A is an Al element, X is a C or N element, and n is an integer ranging from 1 to 3. The MAX phase is of a strip-shaped structure, and the Ag phase is of a nanotwinned structure. The Ag phase aggregates at the grain boundaries of the MAX phase, and the conductive composite coating is of an Ag-wrapped MAX phase structure as a whole. In the present invention, the MAX phase coating is designed, by means of Ag doping, to have a heterogeneous grain shape. The doped Ag affects the growth of MAX phase grains, so that the MAX phase grains are of the strip-shaped structure. Furthermore, the doped Ag is of the nanotwinned structure, and fully wraps the MAX phase grains. Ag is continuously distributed at the MAX grain boundaries. Such a special structure may effectively reduce the scattering of electrons, provide a strong conductive path, and enable the coating to have excellent conductive properties.

The invention relates to the technical field of rare earth powder processing, and discloses a rare earth powder continuous hot press molding strengthening process which comprises the following steps: S1, preparing corresponding high-purity rare earth metal and transition metal according to the material component requirements of a rare earth finished product, determining the proportion of raw materials so as to meet the performance requirements of the final product, and strictly inspecting the quality of the raw materials; and S2, smelting is conducted in a high-vacuum environment, and metal oxidation is prevented. The rare earth powder continuous hot press molding strengthening process can effectively solve the problems that in the process that loose rare earth powder is subjected to compression molding in the prior art to obtain a component in a specific geometrical shape, due to the fact that rare earth powder particles are irregular in shape and uneven in particle size distribution, flowing in a mold is not smooth during feeding, and the product quality is poor. The problem that the density of a pressed product is affected due to the fact that the rare earth powder is locally accumulated too much or too little due to the fact that the rare earth powder is inconsistent in internal density and pressure transmission is hindered is solved.

The invention discloses a prediction method for thermal residual stress of a discontinuous particle reinforced composite material, and belongs to the field of novel composite material modeling. The method specifically comprises the following steps: 1) constructing an initial convex polyhedron reinforced phase particle model; 2) establishing a composite material basic model; 3) performing volume scaling on the initial convex polyhedron reinforced phase particle model to obtain N target convex polyhedron reinforced phase particle models; 4) performing spatial rotation and translation on each target convex polyhedron reinforced phase particle model, and then combining the target convex polyhedron reinforced phase particle model with the composite material basic model to obtain a discontinuous particle reinforced composite material model; and 5) carrying out grid division, applying cooling boundary conditions, inputting thermodynamic attributes of corresponding materials, and carrying out numerical simulation on thermal mismatch behaviors in the cooling process of the discontinuous particle reinforced composite material. The method has the advantages of low modeling difficulty and few control parameters, and can effectively predict the influence of the reinforced phase particle shape on the thermal residual stress distribution of the composite material.

The invention discloses a method for simulating drying of particle materials in a roller dryer. According to the method, the particle shape, the rolling friction force, the acting force between particles and the evaporation model are comprehensively considered, the drying process of the particle materials in the roller dryer is modeled, the model is closer to the actual process, and the universality of the model is enhanced. The model disclosed by the invention can be used for observing the moisture content and the internal flow field of the material at any moment and any position in the drying process, and can be used for predicting the particle distribution and analyzing the drying effect. Besides, the material drying effect in the drying process can be comprehensively evaluated by changing parameters such as the shape of the roller, operation parameters, the shape of the dried material and the water content, and a theoretical basis is provided for process optimization.

The invention relates to the technical field of temporary plugging material selection, in particular to a hot dry rock reservoir temporary plugging material selection method based on a high-temperature force chain strength index, which comprises the following steps of: obtaining relative contact force distribution and cumulative distribution among particles by utilizing a photoelastic image of a crack plugging layer in a pressure bearing process, determining relative contact force classification, and selecting a high-temperature force chain strength index; key parameters of the temporary plugging material are obtained through the strong chain proportion; grading according to the grain shape multi-dimensional index value; calculating entropy weights of the key performance parameters of the temporary plugging material; calculating relative weights of the key performance parameters of the temporary plugging material in different leakage environments; obtaining a weight calculation comprehensive weight by using an AHP and an entropy evaluation method; calculating composite weights of different leakage types according to the comprehensive weight; calculating the strength index of the strong chain according to the composite weight and the leakage type proportion, and selecting the temporary plugging material by using the strength index of the strong chain. The invention solves the problem of lack of temporary plugging material selection for well leakage control of fractured reservoirs in the prior art.

The utility model belongs to the technical field of refractory material crushing, and discloses a refractory material crushing device, which comprises a crusher, an impeller and a motor, the interior of the crusher is fixedly connected with a shell, the interior of the impeller is provided with a cavity, the interior of the impeller is rotatably connected with a cutting gear, and the top end of the cavity of the impeller is fixedly connected with a material throwing disc. The top end of the material throwing disc is fixedly connected with a base, the rear side of the base is fixedly connected with a grinding head, the grinding head is arranged on the outer side of the cutting gear, a flow channel is formed in the outer side of the impeller, and materials are thrown out from the outer side of the flow channel on the outer side of the impeller under the action of centrifugal force and rotate towards the interior, arranged on the outer side of the impeller, of the shell. The problems that when refractory material broken stones are crushed, the crushing quality of a refractory material is poor, the refractory material cannot be uniformly crushed, the crushed finished product is not attractive in grain shape, and a grinding head is easily damaged when a wear-resistant material with high hardness is ground for a long time are solved.

The present disclosure relates to a system, a non-transitory computer readable medium and a method for determining a minimum amount of slurry to be added to a concrete mixture. This comprises measuring a plurality of n particles and determining, for each particle i: a particle volume (I), a particle surface area (II), a particle maximum size (III), a spherical volume (IV) and a spherical surface area (V) associated with a sphere having a diameter equal to the particle maximum size (III), and a remaining free surface. Then, for the plurality of particles, the shape irregularity factor is determined based on the remaining free surfaces of all n particles and the particle volume (I). The shape irregularity factor is used to determine a minimum amount of slurry for binding with a plurality of n particles to create a constructable concrete mixture, and a control signal is sent to a concrete preparation system.

The invention discloses a particle shape and particle size detection method in the melting suspension granulation process of an energetic material, which comprises the following steps: collecting a liquid drop image in the process of heating and dispersing the energetic material into a dispersion medium; determining droplet size distribution data according to the droplet image; determining whether the droplet size distribution meets a cooling crystallization condition, if so, performing crystallization treatment, and if not, adjusting the stirring rate until the droplet size distribution meets the cooling crystallization condition; crystallization of the energetic material is completed, and an energetic material crystal particle image is collected in the crystallization process; according to the energetic material crystal particle image, determining whether the crystal particle diameter distribution meets the crystallization and granulation ending condition or not, if yes, ending granulation detection, and if not, reheating to the melting temperature of the energetic material, then returning to perform liquid drop image acquisition, and if yes, ending detection until the crystallization and granulation ending condition is sufficient. According to the method, real-time dynamic monitoring of the melt crystallization spheroidization process of the energetic material is achieved, and the hysteresis problem of traditional off-line detection is solved.

The invention discloses a method for detecting the particle size and the particle shape of graphite in a negative electrode material. The method comprises the following steps: (1) pretreatment: preparing a graphite suspension; (2) testing: taking 1mL of the graphite suspension in the step (1) and placing the graphite suspension in a flow imager for testing, wherein the parameter setting of the flow imager is as follows: the flow velocity is 0.15 mL / min-2 mL / min; the number of the tested particles is 30,000 to 50,000; the grain size and the grain shape of the graphite are obtained. The method for detecting the particle size and the particle shape of the graphite in the negative electrode material has the beneficial effects that the particle size and the particle size of a graphite sample can be detected at the same time through a flow imager, the detection result is high in accuracy, and the method can be used for guiding a graphitization processing technology and a subsequent pulping technology.

The utility model discloses a gravel blanking guiding device which comprises a support and a collecting frame arranged under the support and used for containing gravel and further comprises a crushing unit arranged at the upper end of the support and used for crushing the gravel. The material guiding unit comprises an upper material guiding assembly arranged on the upper portion of the crushing unit and used for guiding the raw materials into the crushing unit, and a lower material guiding assembly arranged on the lower portion of the crushing unit and used for guiding the crushed gravel into the collecting frame. Gravel which cannot directly penetrate out of an opening of the side blanking hole or the lower blanking hole due to the fact that the grain size or the grain shape is unqualified is crushed by the breaking teeth rotating at a high speed until the size is qualified, and then the gravel penetrates out of the opening of the side blanking hole or the lower blanking hole, so that the gravel with the unqualified grain size or the grain shape can be screened and crushed; and qualified gravel can be further crushed, and the quality grade of subsequently prepared concrete is greatly improved.

The invention relates to the technical field of machine-made sand detection, in particular to a machine-made sand granularity and grain shape detection system. A feeding system performs self-adaptive feeding through a flow sensor in combination with a PID (Proportion Integration Differentiation) algorithm; the drying system dynamically adjusts the temperature according to the initial water content, the real-time weight and the drying time of the machine-made sand, a terahertz time-domain spectroscopy system is combined with standard sample data to construct an equation set for water content detection to calculate the water content, and a laser-induced breakdown spectroscopy and machine vision fusion algorithm is adopted for powder content detection. Obtaining the powder content through a support vector machine model; according to particle size and particle shape detection, ultrasonic vibration dispersion is utilized, laser diffraction and X-ray tomography are utilized, and particle size distribution curves, sphericity, angularity and other particle size and particle shape characteristics are output through a deep learning model and a weighted average fusion algorithm; the invention aims to solve the problems of unstable feeding, unreasonable drying and insufficient detection precision and comprehensiveness in machine-made sand detection.

The invention relates to the technical field of concrete material performance prediction, in particular to a mechanical property prediction method and system for machine-made sand concrete. The method comprises the following steps: obtaining grain shape characteristics and grading characteristics of machine-made sand and hydration potential characteristics of a cementing material; fusing the grain shape feature, the grading feature and the hydration potential feature through a graph neural network to obtain a raw material intrinsic fusion feature; processing microscopic structure image features mapped by a real grain shape by using a knowledge graph to obtain a stress nephogram and a damage evolution feature, and obtaining a physical constraint gradient feature by combining the stress nephogram, the damage evolution feature and an experiment real strength value; quantifying the correlation among the structure image features, the mesoscopic mechanical response features and the mechanical properties of the concrete to obtain strong correlation mesoscopic structure features; and on the basis of the raw material intrinsic fusion features, the physical constraint gradient features and the strong correlation microstructure features, utilizing a multi-modal fusion physical information neural network to predict the mechanical properties of the machine-made sand concrete.

The utility model discloses knife roll equipment for cutting magnesium alloy ingots, which relates to the technical field of metal processing equipment and comprises a main shaft, a knife roll main body is fixedly mounted in the middle of the main shaft, bearing seats are fixedly mounted at two ends of the main shaft, through grooves are uniformly formed in the surface of the knife roll main body at intervals, and a plurality of knife holders are clamped in the through grooves. The tool aprons are spirally arranged on the knife roll main body, the tool aprons are fixedly connected to the bottom surfaces of the through grooves through screws, and tools are mounted on the tool aprons; the knife roll equipment has the advantages that the knife holder fixing screws are arranged in the radial direction of the knife roll body, and disassembly, assembly and operation are easy and convenient; the structure is simple, one-time machining forming is achieved, and vibration resistance is improved; the working efficiency is high, and the yield is greatly increased; the processed product is high in quality, and the granularity and the grain shape of the cut chips of the magnesium alloy ingot meet the standard requirements; operation is safe and reliable.

The present invention discloses an aluminum plate curtain wall imitating tortoise grain stone and a manufacturing method of the aluminum plate. The aluminum plate curtain wall comprises more than one panel unit (1). The panel unit (1) is made of an aluminum plate. The outer surface of each panel unit (1) is composed of a plurality of plates (11) with polygonal boundaries to form a tortoise grain shape. Each adjacent two plates (11) share a convex edge (12). A groove (13) is planed at the position corresponding to the convex edge (12) on the inner surface of the panel unit (1). The aluminum plate curtain wall imitating tortoise grain stone of the present invention has a realistic effect, and the patterns, colors, etc. can be adjusted arbitrarily. It is easy for industrial production, the cost is much lower than that of natural tortoise grain stone, and the installation and replacement are more convenient and safer.

The present invention provides a visual-based real-time control method for concrete formula and a device thereof, wherein the method includes a material property detection method, a mixing quality detection method, and a production quality adjustment formula method. Through the above structure, the present invention can effectively predict the working performance of the concrete mixing process and detect aggregate gradation and particle shape parameters in real time through the cooperation of the material property detection method, the mixing quality detection method, and the production quality adjustment formula method, thereby reducing the necessary performance detection time in the production process and improving production efficiency. When the performance of the current batch of concrete does not meet the requirements, the amount of aggregate to be supplemented is calculated through the current aggregate gradation and particle shape parameters, and adjusted in real time to ensure that the performance of the concrete can meet the requirements when it is discharged, reduce resource waste, and improve the efficiency of adjusting the formula.

This application provides a method and apparatus for precise rice seed sorting based on the fusion analysis of grain shape and color features, relating to the field of rice seed sorting. It solves the technical problem that existing technologies typically process grain shape and color information separately, failing to effectively identify composite defects involving both deformation and color changes. The method includes: acquiring a color image of the rice seeds to be sorted, and performing single-grain segmentation to extract the contour of each grain and its corresponding surface pixel region; calculating the grain shape anomaly index for each grain based on the contour; calculating the color anomaly index for each grain based on the surface pixel region; inputting the grain shape and color anomaly indices into a pre-trained lightweight fusion model to output a comprehensive quality score for each grain; comparing the comprehensive quality score with a set score threshold, and removing unqualified grains from the normal flow path. This application is used in the rice seed sorting process.

The invention relates to cloning of a rice chalkiness phenotype average value and plasticity major gene MPC5 and application of the rice chalkiness phenotype average value and plasticity major gene MPC5 in quality improvement. The major gene MPC5 capable of regulating and controlling the average value and plasticity of chalkiness phenotypes in an opposite mode is determined, and the verification of transgenic tests in a multi-point high-temperature and normal-temperature field for many years shows that after the MPC5 is knocked out, the chalkiness degree of grains is remarkably increased while the grain shape is remarkably widened, and the plasticity of the grains is reduced; overexpressed MPC5 grains are remarkably narrowed, the chalkiness is remarkably reduced, the plasticity is improved, and the expression level of the MPC5 is remarkably improved under a high-temperature condition. The major QTL for controlling the chalkiness phenotype average value and plasticity, the molecular breeding minimum SNPs combination of the major QTL and the molecular breeding minimum SNPs combination and the cloned major gene MPC5 for controlling the chalkiness phenotype average value and plasticity are important targets for cultivating high-temperature-resistant high-quality rice varieties and have wide application value.

A steel sheet has a predetermined chemical composition containing, in mass %, C: more than 0.18% and less than 0.30%, Mn: more than 2.50% and 4.00% or less, and other elements. The steel micro-structure at a position at a depth of ¼ of the sheet thickness from the surface in an L cross section of the steel sheet is, in area %, tempered martensite: 25 to 90%, ferrite: 5% or less, retained austenite: 10 to 50%, and bainite: 5% or less. At a position at a depth of ¼ of the sheet thickness from the surface of the L cross section, the proportion of a total area of retained austenite grains having an area of 1 μm2 or more and having a grain shape circularity of 0.1 or more is less than 50% with respect to the entire area of retained austenite. The steel sheet satisfies the formula CMnγ / CMnα≥1.2.

A rod of technical grade titanium for biomedicine has a structure consisting of ultra-fine grains of alpha phase with a hexagonal close-packed lattice, a fibrous deformation texture and a grain-subgrain structure type, wherein the volume fraction of elongated grains in a size range of 0.1-3 µm with a grain shape factor greater than 2 in mutually perpendicular planes is not less than 80%. Subgrains formed inside the elongated grains have low-angle boundaries that are misoriented from adjacent subgrains by an angle of up to 15°. A method for producing a rod of technical grade titanium for biomedicine includes intense plastic deformation of a billet of technical grade titanium at a temperature of not more than 450°С by rotary swaging at strain rates in a range of 10-2 to 10-4 s-1 and with a total true strain value of e≤2.2. As a result of the formation of an ultra-fine structure, a rod of technical grade titanium produced using the claimed method has high mechanical characteristics.

The invention discloses a preparation method of 5000 series marble grain aluminum alloy for anodic oxidation, which comprises the following steps of: optimizing chemical components, a hot rolling process, an annealing mode and the like, and adopting a small-working-rate cold rolling mode to reduce the influence of the rolling process on the grain shape; and the Al-Mg series H12 state aluminum alloy sheet for anodic oxidation with marbling is prepared, wherein the average grain diameter of the Al-Mg series H12 state aluminum alloy sheet for anodic oxidation is 0.5-1.5 mm, and the grain size is uniform. The novel anodic oxidation effect is achieved, the appearance similar to marble-shaped patterns can be obtained after the product is machined through a conventional anodic oxidation procedure, the product has the unique appearance advantage compared with a conventional anodic oxidation product, and the product grade can be effectively improved.

The utility model relates to the technical field of shoe material processing, in particular to a granular shoe sole forming mold. Which comprises an upper mold, a lower mold and particle forming modules, and a sole forming cavity is formed after the upper mold and the lower mold are assembled, and is characterized in that a plurality of mounting grooves are formed in the inner surface of the sole forming cavity, and the particle forming modules are detachably mounted in the mounting grooves; the shape, the size and the distribution position of the particle forming module can be replaced or adjusted as required; according to the sole forming mold capable of adjusting the particle distribution, the shape, the size and the distribution of the particles are flexibly adjusted by arranging the replaceable or adjustable particle forming modules, and the diversified requirements on the anti-skid performance of the sole in different scenes can be met.

The invention belongs to the field of magnetic materials, and particularly relates to a preparation method of nanocrystalline strips and nanoparticles based on gas-phase driving and liquid rolling. A crystallized thin strip is obtained through the processes of alloy melting, pouring, liquid rolling and the like, the width of the crystallized thin strip is 5-40 mm, the crystallized thin strip is subjected to the processes of heat treatment, crushing, chemical and physical driving particle separation and the like, finally, magnetic particle powder is obtained, the magnetic particle powder is a single crystal, no-damage particles account for 85% or above, the particle proportion of the particles with the damage volume smaller than or equal to 10% is 95% or above, the six-aspect particle size D80 is 8-10 nm and 20-30 nm, and the particle size D80 is 20-30 nm. The grain shape is of a hexagonal prism structure, the length-diameter ratio is (1.2-1.8): 1, and the magnetic induction is 35-80 A.m < 2 > / kg.

The invention relates to the technical field of grain shape measurement, in particular to a wheat grain shape measurer which comprises a bottom plate, a plurality of placement grooves are distributed in the bottom plate, length scale marks and width scale marks are arranged on the bottom plate close to the placement grooves, longitudinal limiting assemblies and transverse limiting assemblies are arranged in the placement grooves, and a plurality of transparent pressing plates are arranged on the bottom plate. The transparent pressing plates are in one-to-one correspondence with the placing grooves and are arranged above the placing grooves; according to the invention, the plurality of placing grooves are transversely distributed on the bottom plate in an array manner, so that a plurality of wheat grains can be measured at the same time, and the measurement efficiency is improved; the length scale marks and the width scale marks are arranged, so that the length and the width of the wheat can be conveniently and intuitively read; a longitudinal limiting assembly and a transverse limiting assembly are arranged in the placement groove, so that the wheat can be accurately positioned, the wheat is prevented from moving in the measurement process, and the accuracy of a measurement result is ensured; the arrangement of the transparent pressing plate can fix the wheat during measurement, prevents the wheat from jumping or shifting, and does not affect the observation of the grain shape of the wheat at the same time.

The invention discloses a grain shaping method and system. The method comprises the following steps: acquiring an image of a grain to be shaped as a sample image; modeling according to the sample image to form a three-dimensional model, and acquiring three-dimensional coordinates of the three-dimensional model as initial coordinates; according to the initial coordinate and the processing size data, obtaining a three-dimensional coordinate of the shaped grain as a target coordinate; a technological parameter package is initialized, the technological parameter package comprises a plurality of machining technological parameters, and the machining technological parameters comprise the cutting depth, the rotating speed of a tool nose, the moving speed of a tool bit and the deviation angle of the tool bit; according to the initial coordinates and the target coordinates, form change parameters are obtained through calculation, and corresponding machining process parameters are selected from the process parameter packet to serve as target machining parameters; determining machining compensation parameters according to the machining tool bit size data, wherein the machining compensation parameters comprise a tool bit axial wear compensation value and a tool bit radial wear compensation value; and finishing shaping processing of the to-be-shaped grain according to the target processing parameters and the processing compensation parameters.

The utility model relates to a kind of mine machinery technical field, disclose a kind of sand making machine crushing cavity structure, including crushing cavity, the inside of the crushing cavity is provided with crushing mechanism, the crushing mechanism is used to crush material, the bottom of the crushing mechanism is provided with discharge mechanism, the discharge mechanism is used to discharge material quickly, the crushing mechanism includes annular lining, the inner wall of the annular lining is fixedly connected in the inside of crushing cavity, the inside of the annular lining is fixedly connected with multiple positioning plate, the left side of multiple positioning plate is fixedly connected with fixed plate, the inside of the annular lining is fixedly connected with multiple taper surface shaping plate.In the utility model, material is thrown to crushing mechanism by throwing material disc, material is broken by multiple times impacting positioning plate and taper surface shaping plate, protective block blocks material rebound, multiple impact breaking and shaping of material are realized, the effect that finished product grain shape is neat, improve sanding rate and quality.

The application relates to a solid engine grain isostatic pressing and compacting device and method, which comprises the following steps: firstly, obtaining a pre-solidified high-solid-content special-shaped grain; then, assembling a matched supporting tool according to the grain shape; then, loading the grain with the supporting tool into a wall tool and moving into an engine shell; covering a diaphragm with a certain strength and elongation on the inner hole surface of the grain, and passing a liquid with a specific temperature into the lowest part of the diaphragm cavity to discharge the air between the diaphragm and the grain, so that the diaphragm is tightly attached to the inner wall surface of the grain; installing a top cover to ensure that the diaphragm edge exceeds a sealing ring, so that the grain is completely separated from the liquid; finally, connecting a hydraulic pump through a pressure measuring connector to gradually increase the cavity pressure in stages, so that the pressure solidification and heat solidification are realized. The application can realize high compacting of 3D printing solid grains with multiple burning rates and complex grain shapes, and fundamentally solves the problems of structural integrity and combustion caused by the low compacting density of 3D printing high-solid-content solid grains.

The utility model discloses a high-strength self-sealing cement concrete machine-made sand production device which comprises a sand making box body, a crushing mechanism and a polishing mechanism are sequentially arranged in the sand making box body from top to bottom, and a driving mechanism used for driving the crushing mechanism and the polishing mechanism is arranged at the upper end of the sand making box body. The grinding mechanism comprises a grinding seat and a circular-truncated-cone-shaped grinding disc, the outer ring of the grinding seat is connected with the inner wall of the sand making box body, a circular-truncated-cone-shaped opening penetrating up and down is coaxially formed in the middle of the grinding seat, and the circular-truncated-cone-shaped grinding disc is coaxially arranged in the circular-truncated-cone-shaped opening; an annular grinding gap is formed between the outer side face of the circular-truncated-cone-shaped grinding disc and the inner wall of the circular-truncated-cone-shaped opening. According to the machine-made sand grinding device, the grinding mechanism is arranged below the crushing mechanism, the particle morphology edge angles of crushed machine-made sand can be ground in a rolling mode along with rotation of the circular-truncated-cone-shaped grinding disc in the grinding mechanism, the particle shape of the machine-made sand tends to be round, and therefore the high-strength self-sealing performance of concrete when the machine-made sand is used is improved.

The invention discloses a sand making machine with the adjustable sand grain size, and relates to the technical field of sand making machines, the sand making machine comprises a screening treatment box, a screening assembly is installed in the screening treatment box, a secondary crushing box is installed at the upper end of the screening treatment box, and a crushing assembly is installed in the secondary crushing box; transmission assemblies are installed on the left side and the right side of the crushing assembly correspondingly, and a control mechanism is installed on the transmission assembly located on the left side. A primary crushing part is installed above the middle of the secondary crushing box, a frame body is further installed on the secondary crushing box, a feeding hopper is installed on the frame body, and an adjusting mechanism is installed on the primary crushing part. According to the sand making machine with the adjustable sand grain size, secondary crushing is conducted on materials through cooperation of the primary crushing part and the crushing assembly, the productivity is guaranteed, the grain shape and grading quality of finished sand are improved, the primary crushing grain size and the secondary crushing grain size can be adjusted at the same time, and the adjusting efficiency and coordination are improved.

To accurately estimate a three dimensional shape of particles from an observation result of two-dimension.SOLUTION: (A) calculating, from a two-dimension image of a plurality of particles to be estimated, an indicator value in a two-dimension of shapes of the particles, (B) generating, from the two-dimension image, a plurality of estimated three dimensional shapes of a first generation, and (C) calculating, for the plurality of estimated three dimensional shapes of the first generation, a feature parameter indicating a shape feature, (D) generating a plurality of estimated three dimensional shapes of the next generation using a control parameter and a feature parameter based on a relationship between an indicator value in the two-dimension of the plurality of estimated three dimensional shapes of the current generation and an indicator value in the two-dimension of the grain shape, and (E) evaluating the relationship between the indicator value in the two-dimension of the plurality of estimated three dimensional shapes of the next generation and the indicator value in the two-dimension of the grain shape, and further executing a process of generating the plurality of estimated three dimensional shapes of the next generation until a process termination condition is satisfied.SELECTED DRAWING: Figure 1