Plane rotary screen is a kind of screening equipment widely used in mineral processing, coal preparation and other industries, its working principle is mainly to use the movement of eccentric blocks to achieve the vibration of the screen, so as to realize the screening of materials.
When the plane rotary screen is working, the eccentric block does a uniform reciprocating reciprocating motion around the center in the drive box, and this movement is transmitted to the screen machine through the drive box, so that the screen vibrates. The vibration direction of the screen is perpendicular to the movement direction of the material on the screen surface, and this vibration mode can make the material jump on the screen surface, so as to realize the screening of the material.
After the material enters the sieve body through the feed port, it can be evenly distributed on the screen surface of the plane rotary screen under the action of vibration force. Due to the continuous change of the vibration direction of the screen, the movement trajectory of the material on the screen surface also presents a variety of forms. At the feed end, the material moves in a horizontal circle, and as the material continues to advance, the material gradually becomes elliptical in the length direction. At the outfeed end, the trajectory of the material becomes approximately reciprocating in a straight line.
The screen of the plane rotary screen generally adopts a multi-layer structure, and materials of different specifications can be screened through different screens. Smaller materials can quickly pass through the lower screens, while larger materials are blocked in the upper screens. Due to the continuous change of the vibration direction of the screen, the upper and lower layers of materials move to the discharge end at the same time, so as to realize the screening of materials.
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In addition, the inclination angle of the plane rotary screen is generally 4-9 degrees, and the size of this angle can be adjusted according to the actual needs. When the inclination angle is large, the movement speed of the material on the screen surface is faster, but it is easy to cause the loss of the material; When the inclination angle is small, the movement speed of the material on the screen surface is slower, but the accuracy of screening can be improved. Therefore, in practical application, it is necessary to select the appropriate inclination angle according to the actual situation to achieve the best screening effect.
In short, the working principle of the plane rotary screen is mainly to use the movement of the eccentric block to realize the vibration of the screen, so as to realize the screening of materials. By adjusting the movement trajectory and inclination angle of the eccentric block, different screening requirements for materials can be realized. This kind of equipment has the advantages of simple structure, convenient operation and large processing capacity, so it has been widely used in mineral processing, coal preparation and other industries.