The main factors affecting the vibrating screen and various screening mechanical processes

The technical and economic indicators of screening process are screening efficiency and productivity The former is quality index, the latter is quantity index There is a certain relationship between them, but also with many other factors, these factors determine the screening results The factors affecting the screening process can be roughly divided into three categories: first, the physical properties of the screened materials include the particle size composition, humidity, mud content and particle shape When the content of fine particles is large, the productivity of sieve is also large When the humidity of the material is large, the screening efficiency will be reduced generally However, the larger the mesh size is, the smaller the influence of moisture is Therefore, for wet materials with larger moisture content, in order to improve the screening process, the method of increasing the mesh size or wet screening can be generally used If the mud content of the material is large (when the mud content is greater than 8%), wet screening or pre washing shall be adopted 2 The influence of the properties of the screen surface and its structural parameters the vibrating screen makes the particles move vertically with the screen surface, so the screening efficiency is high and the production capacity is large The relative motion of particles and screen surface is mainly parallel bar screen, plane vibrating screen, cylinder screen, etc., which has low screening efficiency and production capacity For a certain material, the productivity and screening efficiency of the sieve depend on the size of the mesh The productivity depends on the screen width, which is high The screening efficiency depends on the length of screen surface, and the screening efficiency is high Generally, the aspect ratio is 2 The larger the effective screen area (i.e the ratio of the screen area to the whole screen area), the higher the unit area productivity and screening efficiency of the screen surface The larger the mesh size is, the higher the productivity per unit sieve surface is and the higher the screening efficiency is Third, the influence of production conditions when the load of the sieve is large, the screening efficiency is low To a large extent, the screen peace rate depends on the size of the screen hole and the total screening efficiency; the larger the screen hole is, the lower the screening efficiency is required, the higher the productivity is Feed uniformity is of great significance to the screening process The inclination angle of the sieve shall be suitable, which is generally determined by test The amplitude and vibration times of the sieve are related to the physical properties of the sieve structure In a certain range, increasing the vibration can improve the screening index.