Crushing method and crush theory

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(1) Crushing method 2FU China feed industry information network – based on feed, service animal husbandry

During the processing process, for cereals and cakes, etc. Feed, common crushing, grinding, crushing and smashing 2FU China feed industry information network – based feed, serving animal husbandry

a. Crush crush mdash; mdash; Materials are shocked by external impacts in an instant, which is most advantageous for pulverizing brittle materials, due to high adaptability, high productivity, and is widely used in feed mills. 2FU China Feed Industry Information Network – Based on Feed, Service Animal Husbandry

B. The material is broken when the shear stress reaches the shear strength limit of the material. 2FU China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry

c. Crushed mdash; mdash; Material is placed between two crushing surfaces, and the powder after pressure is applied due to pressure The compressive strength limit is reached, so the crushing effect is better. 2FU China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry

Decoulated mdash; mdash; The direction of the pressure line is cleaved, and the material is broken when the tensile stress on the split plane reaches or exceeds the material tensile strength limit. 2FU China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry

2FU China Feed Industry Information Network – Based on Feed, Serving livestock The mechanical properties of materials have a great relationship with the crushing method to be selected. According to the relationship between material strain and stress, the mechanical properties include the following five types:

2FU China feed industry information network – based feed, service animal husbandry

a. Intensity mdash ; mdash; the strength of the material refers to its resistance to the external force. It is usually shown in the force or PA of the unit area in the unit area when the material is destroyed, and the compression strength, tensile strength, distortion intensity, bending strength, and shear strength can be divided into compressive strength, tensile strength, distortion intensity.

2FU China Feed Industry Information Network – Based on Feed, Service Animal Husbandry

B. Hardness Mdash; Mdash; Hardness Indicates that materials resistance to other materials to scale or press their surface, or understand The energy required to produce a local deformation at the solid surface.

2FU China Feed Industry Information Network -Based on feed, serving livestock

C. brittle mdash; brittleness is a nature opposite the plasticity, from deformation Elastic deformation, without plastic deformation, so its limit intensity does not exceed the elastic limit. 2FU China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry

D. Toughness Mdash; Mdash; The toughness of the material refers to the ability to absorb energy during plastic deformation under the action of external force. . The larger the absorption energy, the better the toughness, and vice versa. 2FU China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry

Easy Work (Bravine) Mdash; Mdash; It is not enough to fully accurately express material crushing only with intensity and hardness. The degree of difficulty, because the pulverization process is determined to be influenced by the physical properties of material, and is also affected by many factors such as material granularity, granular, pulverized method. The so-called fragile property is required to smash the material from a certain particle size to a certain specified particle size under certain pulverization conditions. 2FU China Feed Industry Information Network – Based on Feed, Service Animal Husbandry

For a specific material, there is an internal connection between the above five mechanical properties, resulting in a comprehensive properties of materials. Complexity, these have an effect on the deformation force required for pulverization. In general, the stronger strength, the smaller the hardness, the smaller the brittleness, the larger the toughness, the more deformation it needs. The important basis for selecting a pulverization method is the physical properties of the pulverized material. Among them, the strength and cracking property of the crushed material is two main indicators, which is effective for ray, impact and extrusion; for the tough material, the crispy material is compromised. In the feed processing, the pulverization of the grain raw materials is generally used with a hammer pulverizer, which is mainly striking and pulverized, and the raw material containing fiber is mainly used as shear and grind. In summary, according to the physical and mechanical properties of materials, it is important to correct the pulverization method, which is of great significance for improving the power consumption and energy consumption. 2FU China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry

2FU China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry

Rosin-rammler, etc. According to this double-made analysis, it can be inferred that the damage and pulverization of the particles are not caused by a destructive formation, but is composed of two or more destructive effects. 2FU China Feed Industry Information Network – Based on Feed, Service Animal Husbandry

A. Volume Crushed Model Mdash; MDAThe entire particles were destroyed, and the generated substance was mostly the intermediate particles having a large particle size after pulverization. As the pulverization process progresses, these intermediate particles are gradually pulverized into fine powder components, striking crushing and squeezing and pulverizing this model are relatively close. 2FU China Feed Industry Information Network – Based on Feed, Service Animal Husbandry

Surface Crushing Model Mdash; Mdash; Only at a certain moment, only the surface of the particles produces damage, grinding Cut the fine powder ingredient, which is basically not involved in the interior of the particles. This situation is a typical grinding and grinding pulverization.

2FU China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry

Available in the granules; the force applied to the particles makes the particles produce uniform dispersibility damage, directly pulverized Come into a fine powder. The uniform pulverization model only consists of extremely non-tight particles. 2FU China Feed Industry Information Network – Based on Feed, Service Animal Husbandry The actual pulverization process is often a combination of the precedational pulverization model, the former constitutes excessive ingredients, the latter forms a stable component. The particle size distribution of the pulverized product obtained by the mass crushing and the surface area is different. The particle size after volume is narrow, but the fine particles are smaller, the surface is pulverized, but the particle size distribution is wider, that is, There are also more crude particles. 2FU China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry


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