Although the process of physical screening and impurity removal is based on the aperture of the sieve, the movement trajectory of materials on the surface of the vibrating screen varies depending on the installation method of the excitation source and the structure of the mesh. The industry generally classifies vibrating screens based on the different movement trajectories of materials. A vibrating screen that moves materials in a straight line forward on the screen surface is called a linear screen, a vibrating screen that moves materials in a circular motion on the screen surface is called a circular vibrating screen, and a vibrating screen that moves materials in a reciprocating motion forward on the screen surface is called a fine screening machine.

Detailed comparison of 9 major differences between linear and circular vibrating screens

1. Different working principles

Circular vibrating screen is a device that uses an electric motor equipped with a triangular belt to drive the eccentric block of the exciter to rotate at high speed, generating a large centrifugal inertia force and exciting the sieve box to produce circular motion with a certain amplitude. The material on the screen is subjected to continuous throwing motion by the impulse transmitted by the sieve box on the inclined screen surface. During the process of meeting the material and the screen surface, particles smaller than the sieve hole are passed through the screen, thereby achieving classification.

The linear vibrating screen is driven by dual exciters. When the two exciters rotate synchronously and in the opposite direction, the excitation force generated by their eccentric blocks cancels each other out in the direction parallel to the motor axis, and overlaps into a resultant force in the direction perpendicular to the motor axis. Therefore, the motion trajectory of the screen machine is a straight line, and the two motor axes have an inclination angle relative to the screen surface. Under the combined effect of the excitation force and the self gravity of the material, the material is thrown up on the screen surface and jumps forward in a straight line, thus achieving the purpose of screening and grading the material.

2. The movement trajectory of materials on the sieve surface is different

The material on the circular vibrating screen moves in a circular motion, while the material on the linear screen moves forward in a straight line.

3. Different processing capabilities caused by screening efficiency

For a circular vibrating screen, since the exciter is arranged above the center of gravity of the screen box, the elliptical long axes at both ends of the screen box form a bottom eight shape, and the upper end of the elliptical long axis at the feeding end faces the discharge direction, which is conducive to the rapid dispersion of materials. The upper end of the elliptical long axis at the discharge end is opposite to the discharge direction, reducing the speed of material movement and facilitating the passage of difficult to screen materials. The arc-shaped screen surface also increases the effective area of the screen machine, thereby improving its processing capacity.

For linear vibrating screens, the linear motion trajectory inevitably leads to material stacking, and it is necessary to use a cleaning device to avoid clogging and stacking.

4. Different configurations of vibration motors

The circular vibrating screen is also known as a single axis vibrating screen because the exciter is a shaft that works using an inertia motor. The linear vibrating screen exciter consists of two shafts and works using the principle of vibration motor excitation, so it is also known as a double axis vibrating screen.