Mechanical structure of grading sieve

A grading sieve is a sequential process of the granulation process. After the powder is compression molded and chopped, it must be sieved with a sieve to obtain particles of acceptable size. Larger unacceptable particles are returned to the particle breaker and chopped, while smaller unacceptable particles and fines are recycled to the granulator for regranulation.

According to different mechanical structures and working principles, the currently used particle sorting screens can be divided into two categories: flat rotating screens and vibrating screens. Among them, the vibration screen is divided into two types according to the vibration mode:

A: Eccentric transmission vibration screen and vibration motor vibration screen.

B: There are different types of vibrating screens, such as vibrating screens for eccentric vibrating screens and vibrating motors.

Here, the vibrating screen of the vibrating motor commonly used in the sorting process is introduced. It has the characteristics of small volume, stable operation, good equipment sealing, flexible adjustment and high work efficiency. The vibrating screen is mainly composed of a feeder, a sieve, a vibration mechanism and a frame. After the material enters the filling port, it is buffered and then flows into the upper screen to separate large particles. Small particles pass through the surface of the sieve and into the surface of the second sieve. At this point, unacceptable small particles and powder continue to pass through the second layer of the screen surface, and the second layer of the screen surface retains acceptable grain particles and enters the finished container and packaging process.

The vibrating screen usually consists of a vibrator, a screen box, a suspension or suspension device, a transfer device, and the like.

Vibrator:

Vibrators for single-axis vibrating screens and two-axis vibrating screens are usually classified into two types according to eccentricity reconstruction. The configuration of the eccentric is better for large eccentric wheels.

Screen frame:

The screen box consists of a screen frame, a screen surface and a pressing device. The screen frame consists of side walls and beams. The screen frame must be strong enough.

Device support:

There are two types of vibrating cages: suspension and seat. The seat type is relatively simple to install and the mounting height is low, which is generally preferred. The support device of the vibrating screen is mainly composed of elastic members, usually using a coil spring, a leaf spring and a rubber spring.

transmission:

The vibrating screen usually uses a V-belt drive. The structure of the vibrating screen is simple, and the number of revolutions of the vibrator can be arbitrarily selected, but the belt is easy to slip during the operation, which causes the screen hole to be clogged. The shaker is also driven directly by the clutch. The clutch can maintain the stable speed of the vibrator and has a long life, but the speed of the vibrator is difficult to adjust.

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