The screening efficiency and productivity of the rotary vibrating screen are the technical and economic indicators of the screening process. There is a certain relationship between them, and it is also related to other factors. The following three categories are the main factors that affect the screening process:
1、 The Properties of Sieve Surface and the Influence of Its Structural Parameters
The vibrating screen causes particles to move vertically with the screen surface, resulting in high screening efficiency and large production capacity. The relative motion between particles and the screen surface is mainly parallel to the bar screen, plane vibrating screen, and tube screen, which have low screening efficiency and production capacity. For a certain material, the productivity of the sieve is determined by the size of the sieve opening. The productivity depends on the width of the screen surface, which has a high productivity. The larger the effective screening area (i.e. the ratio of the sieve aperture area to the entire sieve surface area), the higher the unit area productivity and screening efficiency of the sieve surface. The larger the mesh size, the greater the productivity per unit sieve surface and the higher the screening efficiency.
2、 Physical properties of screened materials
The particle size composition, humidity, mud content, and particle shape of the material itself. When the content of fine particles in the material is high, the productivity of the sieve is also high. When the material humidity is high, the screening efficiency generally decreases. However, the larger the sieve size, the smaller the impact of moisture. Therefore, for wet materials with high moisture content, in order to improve the screening process, it is generally possible to increase the sieve size or use wet screening. Wet screening or pre washing should be used for materials with high mud content.
3、 The impact of production conditions
When the load of the sieve is large, the screening efficiency is low. The flatness of the sieve largely depends on the size of the sieve aperture and the overall screening efficiency; The larger the sieve aperture, the lower the screening efficiency required, and the higher the productivity. The uniformity of feed is of great significance for the screening process. The amplitude and frequency of the rotary vibrating screen are related to the structural and physical properties of the screen. Within a certain period of time, increasing vibration can improve the screening index.