With the development of science and technology, the understanding of material crushing has also made great progress. Huge granular materials use various crushing methods to obtain products of several microns to meet various process requirements.
In industry, the most widely used material crushing method is still mechanical crushing, which mainly includes extrusion, splitting, breaking, grinding and impact crushing. Non-mechanical crushing has not yet been used in large-scale industrial production.
When the material is subjected to external force, the stress generated reaches the ultimate strength, and the material is crushed. There are several mechanical crushing methods.
A Crushing
Put the material between two extrusion surfaces, and after applying force, the material is crushed because the compressive stress reaches the compressive strength limit.
B Splitting
Put the material between a plane and a tooth. When the extrusion force is applied, tensile stress is generated in the material. Because its tensile stress reaches the tensile strength limit, it is split along the direction of the force.
C Breaking
Put the material between two surfaces with teeth. When the extrusion force is applied, the bending stress reaches the bending strength limit of the material, and the material is broken.
D Impact crushing
The material is crushed by the impact force of high-speed rotation. This method can be achieved in many ways. Since the force is applied instantaneously, the deformation does not have time to extend to all parts of the impacted object. Only considerable local stress is generated at the impacted part, and the material is broken along the internal micro cracks. Therefore, the crushing effect of dynamic load is much greater than that of static load.
E Grinding
Put the material between two relatively moving working surfaces, apply pressure and shear force at the same time, and when the shear stress generated in the material reaches its shear strength limit, the material is broken.
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