Commonly used classification methods of vibrating screen in powder industry
Screening is divided into dry screening and wet screening according to the moisture content of the material. In the sieving process, the material passes through the sieve holes, the necessary condition is that the size of the particles must be smaller than the sieve holes, and at the same time, the particles have the opportunity to pass through the sieve holes. The sufficient condition is that a certain form of relative motion must be maintained between the particles and the screen surface.
In order to explain the screening quality, the concept of screening efficiency was introduced, that is, the percentage of the mass of the screen material and the total input screen material. The average sieving efficiency of practical operation in industry is about 70%~80%, which is relative to the relative movement of the particles and the screen surface, the thickness of the material layer, the shape of the screen hole and the effective area ratio, the size distribution law of the material particles and the particle shape, The content of too fine particles and the moisture content of the material are related.
The job of the screening machine or equipment is the screen surface. The screen surface structure includes lattice screen (also called grid screen), plate screen (also called screen plate), braided screen (also called mesh screen) and so on. The grid screen and plate screen are used to screen block, granular material, braided screen Used for sieving powder or slurry. Since the moving screen surface strengthens the relative movement between the particles and the screen holes, it will inevitably strengthen the screening efficiency and processing capacity. Therefore, the classification of industrial screening equipment is actually divided according to the motion of the screen surface.