Circular vibrating screen is a kind of screening machine used more in coal preparation plants. This kind of screen is simple in structure and low in maintenance. It is mostly used for screening coarse-grained materials. In coal preparation plants, it is mainly used for the preparation and screening of lump coal before selection, and can also be used for general classification and screening of coal. Circular vibrating screens are divided into single-shaft circular vibrating screens and double-shaft circular vibrating screens according to the number of exciters used. The so-called self-centering refers to the work of the screen, the center line of the drive pulley on the screen box does not change in space, that is, the center line of the pulley on the screen box does not vibrate together with the screen box. According to the structure of the exciter, this screen can be divided into two types: bearing eccentric type and pulley eccentric type.

Features of circular vibrating screen:

1. Large processing capacity and high screening efficiency.

2. The vibrator adopts bearing thin oil lubrication and an external block eccentric structure. It has the characteristics of large excitation force, low bearing load, low temperature and low noise. (Bearing temperature rise is less than 35°).

3. The overall disassembly and assembly of the vibrator is convenient for maintenance and replacement, which greatly shortens the maintenance period. (It only takes 1 to 2 hours to replace the vibrator).

4. The side plate of the screen adopts the whole plate cold work, no welding, high strength and long service life. The cross beam and the side plate are connected by torsion shear high-strength bolts, no welding, and the cross beam is easy to replace.

5. The screen machine adopts rubber spring to reduce vibration. Compared with metal spring, it has the advantages of low noise, long life, smooth cross-vibration zone, and small dynamic load on each fulcrum of the screen machine.

6. The connection between the motor and the vibration exciter adopts a flexible coupling, which has the advantages of long service life and small impact on the motor.

Q & A about the circular vibrating screen:

1.    Why is the circular vibrating screen called Circular?

The movement of the circular vibrating screen seems to move up and down. In fact, the power part is doing circular or elliptical movement. Since the upper and lower parts of the equipment are supported by springs, the circular vibration trajectory of the equipment is buffered and smoothed. It is offset, resulting in a screen movement that seems to be out of specification.

2. In addition to the different principles of circular vibrating screen and linear screen, what is the difference in application?

The circular vibrating screen mainly screens materials with high specific gravity, large particles and high hardness. It is widely used in mines, coal, quarries and other mining industries. It is an ideal equipment for processing primary and secondary crushed materials. It can also be used for screening finished materials. The linear screen mainly screens fine particles, light specific gravity, and low hardness materials. It is usually widely used in the food, chemical, building materials, and pharmaceutical industries. The screen surface is linearly reciprocating, and the upper material layer is moving forward at the same time , It is also compacted in the process of jumping and falling, so it is especially suitable for dehydration, de-medium, de-liquid and heavy-medium removal in heavy-medium beneficiation. It is widely used in coal preparation plants.