Vibrating screen is a widely used large screening machine, both dewatering and recovery functions, simple structure, easy maintenance and operation, saving investment costs and floor space. Its main role is dewatering, grading, demineralization, coal slurry dewatering, froth coal dewatering, etc., the role in coal mining, construction occasions, etc.
Screening efficiency is the main process index to measure the screening work. When sieving materials, two kinds of products can be obtained: on-screen and off-screen. In fact, the product on the screen will still contain fine particles that can be screened down. That is to say, the mass of the fines grade material under the screen is necessarily smaller than the total mass of the fines grade material in the original feed. In the real sieve, it is very difficult to weigh out the weight of the material to be sieved.
The calculation formula is: E=β(α-θ)/α(β-θ)*100%.
In fact, it is very difficult to calculate the sieving efficiency by theoretical methods. At present, it is common to use experimental methods to first determine the percentage of subscreen product content in the original feed material a, and then determine the percentage of subscreen level content in the product on the screen c, and then the sieving efficiency can be calculated.
Screening efficiency is related to many factors, such as the moisture content of the material, the number of difficult to screen particles, the shape of the material particles, the shape of the screen hole, the effective area of the screen surface, the length of the screen surface and the thickness of the material layer.