Vibrating screens are often utilised in industries that need to separate certain materials from a bulk product and classify them according to specific groups. These tools have vibrant chassis that can support several elements that are intended for the actual screening process. Some of these elements vibrate so that the bulk product can move and be screened along the way.
The screening action is significantly carried out by the screening elements. These elements often have either flat or slightly curved surfaces that are often filled with perforations. The perforations of these elements may then have certain sizes, ensuring that the desired products will be obtained fully.
The performance of the vibrating screens would typically depend on their overall condition. However, the materials that are being fed into these tools can also affect their performance. Some of the material factors that affect the performance of vibrating screens are as follows:
Materials that are being processed by vibrating screens can take up different shapes and appearance. Some of them may be angular, while others could be spherical. Other materials can also be ovaloid, flaky, acicular, or slabby. The components used in a vibrating screen should cater to the shape of the materials to avoid any slowdowns and mishaps during the screening operations.
Another factor that must be taken into account is the material size. The size of the materials can easily affect the screen performance given that they can either accelerate or slow down the screening process. Considering the size of the materials can help a business choose the perfect screening element, particularly on the size of its perforations as well as its overall composition.
As previously stated, materials can boast different sizes. And as materials with varying sizes are fed into the vibrating screen, the rate of passage through a screen opening can also vary. Size distribution can be measured through sieve analysis and can be expressed as the weight per cent of each fraction between consecutive sieves.
Aside from shape and size, the bulk density can also affect the performance of the vibrating screen. The process of screening is basically a volumetric measurement. However, the rate of the material passage by the screen or capacity is often charted in units of weight per unit time. For optimum performance of the screen, the actual rate of material from a varying bulk density must be modified.
One more material factor that can affect vibrating screen performance is moisture. Moisture that is often found in materials may be absorbed, adsorbed, or both. Surface moisture promotes the sticking of materials together, which would only resist the stratification process. Absorbed moisture in materials, alternatively, would only block screen perforations.
To find out more about vibrating screens, feel free to call us at Hawk Machinery. We have been manufacturing and supplying crushing, screening, feeding, and conveying equipment to the extractive industry together with plant layout and turnkey projects for more than 30 years now.