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High Frequency Viratory Screens

High Frequency Viratory Screens

High Frequency Viratory Screens

According to their structure and movement characteristics, screening machines are divided into circular High Frequency Viratory Screens, linear High Frequency Viratory Screens, resonant screens, fixed screens, roller screens, thick screens, cylindrical screens, etc. Different screens have their own materials when processing materials. Advantages and scope of application. Circular High Frequency Viratory Screens and linear High Frequency Viratory Screens are commonly used in mine production. These two types of High Frequency Viratory Screens have been introduced in the previous article(Vibrating Screens Manufacturers). This article mainly introduces the remaining ones.

Resonance Screen

Resonant screen is a kind of High Frequency Viratory Screen with the vibration frequency of the screen surface and the natural vibration frequency of the screen surface (including the loaded material). It can effectively use the natural frequency of the equipment and work in the near-common vibration state, so the power consumed is very small. . However, the structure of the resonant sieve is relatively complicated, the adjustment is troublesome, the failure rate is high, and there are many problems in terms of structural strength.

Fixed Screen

The working part of the fixed sieve is fixed, and the screening of the material is slid along the working surface by the material under the action of its own weight. Fixed sieves are used more in the concentrator, mainly for pre-screening before coarse or medium crushing. The fixed sieve has a simple structure, is convenient to manufacture, can be used without discharging power, and can directly discharge the ore to the sieve surface, thereby saving cost. However, its productivity is low and screening efficiency is low.

Roller Screen

The working surface of the roller screen is composed of a horizontally arranged rolling shaft having a plate on which the fine material passes through the gap between the rollers or the plates. The bulk material is moved by the roller to one end and discharged from the end.

The screen shaft of the roller screen is arranged at different working angles, and the speed is faster when the material is operated at a position with a higher working angle; the speed is gentler when the material is operated at a lower working angle. The materials under two different speeds start to move axially when they meet at a certain position on the screen surface, so that the materials are evenly distributed on the screen surface, thereby achieving the purpose of improving the screening efficiency. Roller screens are rarely used in concentrators.

Equal Thickness Screen

The equal-thickness sieving machine is also called a banana sieve because it is shaped like a banana. The principle is an efficient screening technique developed based on the theory of mass movement of the material on the screen surface. The characteristic is that regardless of the percentage of the particles in the feed which is smaller than the sieve hole, the thickness of the material layer on the sieve surface remains unchanged or increasing during the screening process: the ordinary sieve method is in the screening process, the sieve surface The thickness of the material layer is decremented. Therefore, the equal-thickness screening method can double the processing capacity of the screen machine.

Cylinder Sieve

The working part of the cylindrical sieve is cylindrical, and the entire sieve is rotated around the axis of the cylinder, and the axis is generally installed with a small inclination angle. The material is fed from one end of the cylinder, the fine grade material is passed through the screen opening of the cylindrical working surface, and the coarse material is discharged from the other end of the cylinder. The rotary screen has a low rotation speed, stable operation and good dynamic balance. However, the sieve hole is easy to block, the screening efficiency is low, the working area is small, and the productivity is low.

When selecting the sieving machine, the characteristics of the sieving material should be fully considered (the content of the material under the sieve, the content of the granules, the moisture and clay content of the material, the shape of the material, etc.), the structure of the sieving machine (screen area, Factors such as the number of screen layers, mesh size and shape, production process requirements (processing power, screening efficiency, etc.) ensure that equipment suitable for your own working conditions is selected.

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