Date: Oct. 16, 2021
Vibrating screen is one of the indispensable equipment in the sand washing industry. The efficiency of the vibrating screen directly affects the efficiency of the industry. If the efficiency of the vibrating screen is low, it will cause boring waste and reduce the economic benefits of the enterprise. How to improve the efficiency of the vibrating screen is what many customers want to know. This article will analyze this problem for everyone.
Factors affecting the screening efficiency of the vibrating screen: material factors, equipment factors. Among them, the material factors include the moisture content, bulk density, particle size, and particle shape that affect the screening effect.
During the dry screening, materials with high moisture content or good wettability and adhesion are more likely to agglomerate and agglomerate, causing blockage of the screen holes and greatly reducing the screening efficiency.
When the bulk density of the material is large, the screening capacity of the vibrating screen is proportional to the bulk density.
The more sieve particles contained in the material, the easier it is to sieve the material, otherwise, the material is more difficult to sieve. The particle size d=1～1.5a (a is the sieve size) is easy to get stuck in the sieve of the vibrating screen, which is called obstruction. Granules affect the material to pass through the sieve. Therefore, the more difficult-to-screen particles and obstructive particles in the material, the lower the screening efficiency of the vibrating screen.
When the particle shape of the material is spherical, it is easy to pass through the square hole and round hole vibrating screen. When the particle shape of the material is strip, flake, or polygonal, it is more difficult to pass through the square hole and round hole sieve, but it is easier to pass Rectangular sieve holes.
In addition to material factors and equipment, factors will affect the boring screening results. Good manufacturers’ vibrating screens will have more accurate details such as the screen surface, sieve holes, and inclination angles, and will also be tailored according to the different types of customers. It can greatly reduce the loss, improve the screening effect and discharge quality. Equipment factors are specifically divided into screen surface size, screen surface inclination, opening rate, and screen hole shape
If the aspect ratio of the screen surface is too large or too small, the screening efficiency will be reduced. The aspect ratio of the vibrating screen surface should be within a suitable range, generally 2.5～3.
If the inclination angle of the screen surface is too small, the production capacity will be reduced; if the inclination angle is too large, the screening efficiency will be reduced. Therefore, it is very important to set a proper inclination angle for the vibrating screen. The inclination angle of the vibrating screen is generally 0°～25°, and the inclination angle of the fixed screen is generally 40°～45°.
The ratio of the sieve area of the vibrating screen to the area of the screen surface is called the opening rate. The screen with a large opening rate has high screening efficiency and large production capacity, but the relative strength of the screen is low and the life is short.
The shape of the sieve hole is different, and the passing capacity of the material varies greatly. Therefore, when choosing a vibrating screen, it should be noted that the screen hole pattern of the screen should be compatible with the particle shape of the material in the production line.
The amount of feed should be controlled reasonably to avoid too much or too little. When feeding, the material should be continuously and evenly fed so that the material is evenly distributed along the screen surface, which can effectively ensure higher production capacity and screening efficiency. In some cases, the vibrating screen is not fed along the full-screen width, which will cause the screen surface to not be fully utilized. Therefore, it is necessary to carefully check and adjust the feeding method in time during work. When the screening efficiency is unsatisfactory, you can consider adjusting the inclination angle of the vibrating screen. A proper inclination angle is beneficial to reduce the thickness of the material. Increase the opening rate of the vibrating screen sieve plate, high opening rate is conducive to improving the screening effect, usually, stainless steel welded sieve plate has a high opening rate. To reduce the hole blocking rate of the vibrating screen, consider choosing a sieve plate with a self-cleaning function. Compared with dry sieving, the sieving effect of wet sieving is better. For dry screening, the incoming moisture must be strictly controlled.
Material screening is an important link in the production of mines, chemical plants, cement plants, and other industries. Perform the above analysis when using vibrating screens and make these adjustments to the equipment. The effect of the screened materials will be better.
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