Vibrating screen is an indispensable and important equipment in mines, chemical plants and cement plants. Its screening efficiency directly affects the production efficiency. We have prepared the following guide to help you improve the efficiency of the vibrating screen.
1. Use a large size sieve
The use of large-size sieves increases the vibration force and amplitude, increases the impact stress and shear stress of the sieve plate on the material, overcomes the adhesion between ore particles, reduces the clogging of the screen surface, and makes the screened materials loose quickly. , stratification and sieving. Due to the improvement of the operating conditions of the screen, the screening efficiency of the vibrating screen is effectively improved.
2. Increase the screening area in the vibrating screen
Reducing the material amount per unit screen surface can improve the screening efficiency. When the actual material amount on the screen surface is about 80% of the screen capacity, the screening efficiency of the screen is high. Due to the large number of screened fine particles, it is necessary to ensure sufficient screening area during screening, and appropriately lengthen the screen surface of the vibrating screen to make the aspect ratio above 2:1, which can effectively improve the screening efficiency.
3. Use a reasonable inclination angle to control the flow speed of the material
Generally speaking, the larger the inclination angle of the vibrating screen is, the faster the material on the screen moves, the larger the production capacity and the lower the efficiency. Therefore, in order to improve the screening efficiency of the equipment, the moving speed of the material on the screen surface can be controlled below 0.6m/s, and the left and right inclination of the screen surface can be maintained at about 15°.
4. Equal thickness screening method is adopted
With the progress of screening process, the thickness of materials on the screen surface gradually becomes thinner from the feed end to the discharge end, resulting in unreasonable feeding phenomenon, that is, the use of screen surface is tightened first and then loosened.
Therefore, the broken line screen surface with different inclination can be used to control the different moving speed of materials in each section of the screen surface, so that the ore flow can flow obliquely forward, so as to improve the through screen machine for difficult particles at the discharge end.
5. Adopt multi-layer screen
Almost all "difficult to screen particles" and "blocked particles" in the ordinary single-layer screening feed move from the feed end to the discharge end, thus affecting the stratification and screening of medium and fine materials. The multi-layer screen is adopted, the screen hole of the screen from the lower layer to the upper layer gradually increases, and the inclination angle of the screen surface gradually decreases.
In other words, materials with different particle sizes can be loosened, layered, pre screened and fine screened on the upper, middle and lower screen surfaces with different inclination angles and screen holes, so as to overcome screen hole blockage and improve screening efficiency.
The above introduces 5 methods to improve the screening rate of vibrating screen. In sand and gravel production, if the screening efficiency of vibrating screen is low, the above 5 methods can be adopted to improve the screening efficiency of vibrating screen.