Screening Quality Below Standard? Operational Anomalies? Save This Guide on Troubleshooting and Maintenance of Common Vibrating Screen Issues

A vibrating screen is a key piece of equipment in the production process of modified plastics, and its normal operation is crucial for ensuring product quality and production efficiency.

Identifying faults and resolving them promptly ensures the stable operation of the vibrating screen, which not only enhances production efficiency but also holds significant importance for the sorting operation.

The poor quality of screening is mainly reflected in.The material on the sieve contains too much fine powder, or the material under the sieve contains coarse particles that should not be present.This is usually related to the nature of the feed, equipment condition, and operating methods.

Issue phenomenon:Screening efficiency has plummeted, and processing capacity has.

Cause Analysis:When the feed contains a high amount of mud and water, it can cause the material to stick to the screen holes, blocking them.

Solution:

First, the screen holes should be cleaned.

Then appropriately adjust the spray volume and the inclination angle of the sieve surface.

Problem phenomenon:Large particles exceeding specifications appeared in the product, and the screen is partially damaged.

Cause analysis:When the screen is used for a long time, the mesh holes can become severely worn, significantly affecting the screening efficiency.

Solution:

Repair the worn sieve holes.

When the wear is severe, consideration should be given to replacing the screen.

Problem phenomenon:The screen utilization rate is low, local materials are too thick, and the screening is not thorough.

Cause Analysis:When the feed chute of the sieve is too narrow, it can cause the material to not be evenly distributed across the entire screen surface.

Solution: Translate the above content into English and directly output the translation result without any explanation.The width of the feed chute should be adjusted to ensure even feeding of the screen.

Problem phenomenon:The material layer on the screen is too thick, preventing fine particles from effectively passing through the screen.

Cause Analysis:This may be caused by an increase in feed quantity, blockage of screen holes, or a small screen surface inclination angle.

Solution: Translate the above content into English and directly output the translation result without any explanation.The feeding amount should be reduced, the screen mesh should be cleaned, or the screen surface tilt angle should be adjusted based on the specific situation.

Linear vibrating screen

The technical indicators of the sieve during operation include the sieve's rotation speed, vibration force, and amplitude frequency. Common types of faults include:The screen cannot start or the amplitude is too small, the speed is insufficient, the vibration force is weak, and the amplitude at four points is inconsistent.

Troubleshooting Steps:

Electrical First:Check for any electrical faults, such as motor damage or insufficient voltage.

Mechanical Follow-up:Check if the material on the screen surface is severely accumulated; if so, it should be cleared in a timely manner. Inspect the coupling bolts on the exciter for any looseness and check if the lubricant has solidified; if so, the bolts should be tightened promptly and the grease replaced.

Causes and Handling:

It may be due to electrical reasons; at this time, the cause should be identified and dealt with promptly.

It may also be that the drive belt is too loose, in which case the drive belt should be tightened.

Causes and Solutions:The possible reason is that the heavy weights on the flywheel are installed incorrectly or are too light. In this case, the weights on the flywheel should be adjusted.

Causes and Treatment:This may be caused by the asynchronous operation of two exciters on the same axis or material segregation. At this time, adjustments should be made to ensure the synchronous operation of the two exciters and promptly eliminate material segregation.

Multi-layer vibrating screen machine

The vibrating screen is often subjected to high-frequency vibrations, making its structural components prone to fatigue damage. Common failures include broken pipe beams, broken cross beams, and broken screen frames.

Prevention and Resolution:

If the tube beam wall is too thin, it may cause fractures. In this case, a thick-walled tube of the same model or a tube beam of a larger model should be selected. However, it should not be too large or too thick, so as not to increase the vibrating mass.

The connection points of the screens in the dehydration and dehydration medium sieve must have horizontal and vertical pressure strips. If there are no vertical pressure strips, water will leak and wash away the pipe beams, leading to breakage.

The wider the sieve, the more likely the beam will break. When the sieve width exceeds 3 meters, it is best to adopt a double-channel design.

Causes and Solutions:The fracture of the crossbeam is often caused by prolonged working time at the critical frequency, resulting in the loosening of a large number of high-strength bolts that secure the side plates, severe deformation of the springs, or excessive weight errors of the eccentric blocks. At this point, it is necessary to replace the damaged structural components and crossbeam, tighten the bolts, and adjust the mass of the eccentric blocks.

Solution:The screen frame is prone to cracking due to vibration, and the best way to solve this problem is to thicken the side panels or add auxiliary plates to the local areas near the vibrator to enhance the overall rigidity of the screen frame.

Circular vibrating screen

Abnormal noise is an early sign of equipment failure and should not be ignored.

Spring damage:When the spring is damaged, it will produce a loud noise; at this time, the spring should be replaced promptly.

Bearing wear:When the bearing is severely worn, it will produce loud noise, and at this time the machine should be stopped promptly to replace the bearing.

Loose bolts on the fixed bearing.Loose bolts on the fixed bearing can cause abnormal noise during the operation of the screen. At this time, the bolts should be tightened promptly.

The screen is not tightened.If the screen is not tightened, it will cause abnormal noise during operation and affect the screening effect. In this case, the screen should be tightened promptly.

When selecting a sieve, it is important to choose the appropriate one based on specific usage conditions and purposes, while allowing for some margin.

During installation, the installation diagram should be followed according to relevant standards and steps. Adequate preparations should be made before starting, and the order of starting and stopping should be remembered.

Dice should be regularly inspected and maintained during use. Inspection and maintenance should be carried out in accordance with relevant regulations, with special attention to areas prone to failure. Any problems discovered should be promptly resolved.