How to calculate the process parameter of the vibrating screen
In the process of designing the vibrating screen, it is necessary to design its various structural parameters and process parameters reasonably. The process parameters mainly include the length and width of the screen surface, the opening rate of the screen surface, the productivity and screening efficiency of the screen. This article will introduce the calculation methods of these three process parameters.
The production rate of the vibrating screen is calculated according to the amount of raw material into the screen. The calculation method of productivity generally consists of flow method and average method. This article mainly introduces the averaging method. Productivity Q can be calculated as follows:
Q=FqrKLMNOP, where F is the working area of the sieve (m2), q is the productivity per sieve surface area, r is the bulk density of the material, and K, L, M, N, O, and P are the correction coefficients, which can be selected according to the specific situation .
2) The length and width of the sieve
According to the given productivity, the required screening efficiency and the screening characteristics of the material, the required screening area is calculated. Then find the width of the screen surface, usually the thickness of the material layer cannot be greater than 4 times the size of the screen hole. Generally, the screen surface length of the mine vibrating screen is generally about 4m, and the length ratio is about 2. The screen surface length of the coal vibrating screen used for final classification, dehydration and de-intermediation is about 6m, and the length ratio is about 1.5~2.5.
3) The opening rate of the screen surface
Round hole: For the lower square hole:. According to the calculation of these two formulas, it can be known that the opening rate of the steel plate screen surface is low, but the service life is long and the material selection is easy.
4) Screening efficiency
In screening operations, screening efficiency is a quality index that measures the screening process, and refers to the ratio of the weight of the product under the sieve to the weight of the grade under the sieve in the raw material. The sieving efficiency can generally be calculated by the following formula: where a is the percentage of the content of the product under the sieve in the raw material, and the other parameter is the percentage of the content of the product under the sieve in the sieve.
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