Main factors affecting screening effect of vibrating screen system
The technical and economic indexes of vibrating screen screening process are screening efficiency and productivity. The former is a quality indicator and the latter is a quantity indicator. There is a certain relationship between them, but also related to many other factors, which determine the screening results. The factors affecting the screening process can be divided into three categories:
1. Physical properties of screened materials
Including the particle size composition, humidity, mud content and particle shape of the material itself.
When the fine particle content of the material is large, the productivity of the sieve is also large. Generally speaking, the screening efficiency will decrease when the humidity of the material is high. However, the larger the size of the sieve hole is, the smaller the influence of moisture is. Therefore, for wet materials with large moisture content, in order to improve the screening process, the method of enlarging the sieve hole or wet screening can be generally adopted. If the sludge content of the material is large (when the sludge content is greater than 8%), wet screening or pre washing should be adopted.
2. Influence of sieve surface properties and structural parameters
For a certain material, the productivity and screening efficiency of the sieve depend on the size of the sieve hole. The productivity depends on the screen width, which is high. The screening efficiency depends on the length of the screen surface, which is long and has high screening efficiency. Generally, the length width ratio is 2.
The larger the effective screen area (i.e. the ratio of screen hole area to the whole screen surface area), the higher the productivity per unit area of screen surface and screening efficiency. The larger the mesh size, the greater the productivity per unit screen surface and the higher the screening efficiency.
3. Influence of production conditions
When the load of vibrating screen is large, the screening efficiency is low. To a large extent, the efficiency of vibrating screen depends on the size of screen hole and the total screening efficiency; The larger the sieve hole is, the lower the screening efficiency is required, and the higher the productivity is.

The inclination angle of the sieve should be appropriate, which is generally determined through tests. Then there is the amplitude and vibration times of the sieve, which is related to the structural physical properties of the sieve. Within a certain range, increasing the vibration can improve the screening index.