3 Tips of Vibrating Screen Problems & Solutions

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3 Tips of Vibrating Screen Problems & SolutionsThere are many kinds of vibration screens, such as electromagnetic vibration screens, circular vibration screens,

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3 Tips of Vibrating Screen Problems & Solutions

There are many kinds of vibration screens, such as electromagnetic vibration screens, circular vibration screens, linear vibration screens, etc. The latter two belong to inertial vibration screens, which are commonly referred to as vibration screens. In daily production, vibration screen will encounter a variety of problems, such as poor screening quality, bearing overheating, abnormal sound, wrong technical indicators and so on.

Poor screening quality

There are many factors affecting the screening effect, including the nature of feeding, equipment factors, operation factors and so on. The reasons for poor screening quality include blocking of sieve hole, serious wear of sieve hole, uneven feeding of sieve, too thick material on sieve and insufficient inclination of sieve surface.

When the mud content and water content in the feed are high, the material will stick to the sieve hole and block the sieve hole. At this time, the sieve hole should be cleaned first, and then the spray amount and the inclination angle of the sieve surface should be adjusted appropriately.

When the screen is used for a long time, the wear of the screen hole will be serious and the screening effect will be seriously affected. At this time, the wear screen hole should be repaired. When the wear situation is very serious, the replacement of screen mesh should be considered.

When the feeding trough of the sieve is too narrow, the material can not be uniformly distributed along the whole sieve surface, which makes the sieve surface inefficient to use, and will affect the screening effect. At this time, the width of feeding trough should be adjusted to make the feeding of sieve uniform.

The excessive thickness of material on screen may be caused by the increase of feeding quantity, blocking of screen hole and small inclination angle of screen surface. At this time, it should be adjusted according to the specific situation.

For the circular vibrating screen, the most common reason for the poor screening effect is the inadequate inclination of the screen surface, so it is necessary to pad the back support. In practical application, the inclination angle of screen surface is more suitable when it is 20 degrees. The inclination angle of circular vibrating screen is generally 16-20 degrees. If the inclination angle is lower than 16 degrees, the phenomenon that the material on the screen is not moving smoothly or rolling upward will occur.

For linear vibrating screen and high frequency vibrating screen, the poor screening quality may be related to the movement direction of eccentric block, because two groups of eccentric blocks with the same mass need to rotate in self-synchronization and reverse direction to produce a single exciting force along the vibration direction at each instant, which has a fixed angle with the horizontal direction, so that the screen box can move in a reciprocating straight line. If not in the same phase, the direction of excitation force and direction of vibration will not overlap, and the effect of efficient screening will not be achieved.
 

Bearing overheating

Generally speaking, the bearing temperature should be kept between 35 and 60. If the bearing temperature is too high during the test run, there may be the following reasons:

Because the bearing on the vibrating screen bears a large load, a high frequency, and the load is always changing, the bearing must adopt a large clearance. If the bearing with ordinary clearance is used, the outer ring of the bearing must be grinded again to make it a large clearance.

There must be a clearance between the cover and the outer ring of the bearing to ensure the normal heat dissipation and certain axial movement of the bearing. The clearance can be adjusted by a gasket between the end cap and the bearing seat.

At this time, the bearings need to be oiled, cleaned, replaced and sealed to check the quality of oil and oil injection. In addition, there may be bearing wear or bearing quality problems.

Abnormal sound when the sieve is running

The possible causes of abnormal sound during the operation of sieve are spring damage, bearing wear, bolt loosening of fixed bearing, unstretched screen, etc.

When the spring is damaged, there will be greater noise. At this time, the spring should be replaced in time to prevent production accidents.

When bearing wear is serious, it will produce great noise. At this time, the machine should be stopped and the bearing should be replaced in time.

The loosening of the bolt of the fixed bearing will cause abnormal sound when the sieve is running. The bolt should be tightened in time at this time.

When the screen is not tightened, it will make the sound abnormal when the screen is running, and affect the screening effect of the screen. At this time, the screen should be tightened in time.

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