Differences between Circular and Linear Vibrating Screen

Classification of vibrating screens

Vibrating screens can be classified according to their material trajectory.

Fine screening machines are less frequently used in the production of crushing mills, so the comparison here focuses on linear and circular screens. In practice, circular and linear vibrating screens are not fundamentally different in pattern and structural composition. The material is screened by the vibration of the screen surface for the purpose of screening, but the difference in the vibration trajectory will directly affect the purpose of screening.

Working principle

Circular vibrating screen

The electric motor is driven by a v-belt, which causes the eccentric wheel of the exciter to rotate at high speed and generate a large centrifugal inertia force, which excites the circular vibrating screen to produce a circular motion of a certain amplitude. The material on the screen is subjected to a continuous throwing motion by impulses transmitted from the screen box on the inclined screen surface and sieves particles smaller than the screen holes as they encounter the screen surface, thus achieving classification.

Linear vibrating screens

A vibrating motor is used as the source of vibration, causing the material to be thrown on the screen as it moves in a straight line. The material enters the linear vibrating screen evenly through the inlet and is passed through the multilayer screen producing several different sizes of oversize and undersize products which are discharged through their respective outlets.

Circular vibrating screen VS Linear vibrating screens

1.Environmental protection

Linear vibrating screen can adopt a fully enclosed structure, no dust, more conducive to environmental protection.

In the field of sand crushing or sand washing, circular vibrating screens have a large number of applications. In practice, the use of circular or linear vibrating screens depends mainly on the type of material and the application are handled by the user. The choice of equipment differs according to the purpose of the screening.

2.Fields of application

The circular vibrating screen is mainly used for classifying materials with high specific weight, large particles, and high hardness. It is widely used in the mining industry, for example in mines, coal, and quarries.

Linear screens are mainly used for fine-grained, light, and low-hardness materials and consist mainly of dry, fine-grained, or finely powdered materials. They are widely used in the food, chemical, building materials, and pharmaceutical industries.

3.Handling capacity

In the case of circular vibrating screens, the material is quickly dispersed because the exciter is arranged above the center of gravity of the screen box and the upper end of the long elliptical axis at the feed end faces the discharge direction. The upper end of the elliptical long axis at the discharge end is opposite to the discharge direction, which reduces the movement speed of the material and facilitates the screening of difficult-to-screen materials. The surface of the curved sieve increases the effective area of the sieve machine, thus increasing its handling capacity.

In addition, for difficult-to-screen materials, the circular vibrating screen can make the spindle reversed, so that the vibration direction is opposite to the direction of movement of the material, and the movement speed of the material along the screen surface is reduced. Improve the screening efficiency.

4.Environmental protection

Linear vibrating screen can adopt a fully enclosed structure, no dust, more conducive to environmental protection.

In the field of sand crushing or sand washing, circular vibrating screens have a large number of applications. In practice, the use of circular or linear vibrating screens depends mainly on the type of material and the application are handled by the user. The choice of equipment differs according to the purpose of the screening.