Factors affecting the screening performance of high-frequency vibrating screens

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The technical and economic indicators of a vibrating screen during the screening process are screening efficiency and productivity, with the former being a quality indicator and the latter a quantity indicator. There is a certain relationship between the two, and it is also related to many other factors that determine the outcome of screening. The factors that affect the screening process can be roughly divided into three categories: First, the physical properties of the material to be screened, which include the particle size distribution of the material itself, its humidity, the amount of mud present, and the shape of the particles. When the fine particle content of the material is high, the productivity of the sieve is also high. When the moisture content of the material is high, the screening efficiency generally decreases. However, the larger the sieve pore size, the less impact moisture has. Therefore, for wet materials with high moisture content, in order to improve the screening process, it is common to use larger sieve pores or employ wet screening. When the material has a high clay content (above 8%), wet screening or pre-concentration by washing should be employed. II. Properties of the screening surface and the influence of its structural parameters: The linear high-frequency vibrating screen causes particles and the screening surface to move perpendicularly to each other, which results in high screening efficiency and large production capacity. Vibrating screens such as planar high-frequency vibratory screens and drum screens, in which the relative movement between the particles and the screen surface is primarily parallel motion, have low screening efficiency and production capacity. For a given material, the productivity and screening efficiency of a sieve depend on the sieve mesh size. Productivity depends on the screen width; a wider screen results in higher productivity. The screening efficiency depends on the length of the screening surface; a longer screening surface results in higher efficiency. The aspect ratio is generally 2. The larger the effective sieve area (i.e., the ratio of the sieve pore area to the total sieve surface area), the higher the productivity per unit area of the sieve surface and the screening efficiency. The larger the sieve pore size, the higher the productivity per unit of sieve area and the greater the screening efficiency. III. Influence of production conditions When the load on the sieve is high, the screening efficiency is low. To a large extent, the smoothness of the screen in circular high-frequency vibration screens depends on the size of the screen pores and the overall screening efficiency ； The larger the sieve pores, and the lower the required screening efficiency, the higher the productivity. Feed uniformity is of great significance to the screening process. The inclination angle of the sieve should be appropriate, usually determined through testing. Another factor is the amplitude and frequency of vibration of the sieve, which are related to the structural properties of the sieve; within a certain range, increasing vibration can improve the screening performance.