Common problems and solutions of vibrating screen
Posted by Tony Chen on December 14th, 2020
Vibrating screen is a commonly used material screening equipment in mines and quarries, but it will inevitably encounter various failures during use, which will affect production.
This paper analyzes the five problems of vibrating screen shaft fracture, transmission failure, high shaft temperature, oil rejection and screen surface aging, and summarizes the treatment measures.
Cause analysis of common failures
1. Reasons for shaft fracture
In the actual use process, shaft fracture is a relatively common fault, which will cause the circular vibrating screen to stop working immediately, and the maintenance is also more complicated, so great attention must be paid. The main reasons for shaft fracture are as follows:
① Long-term metal fatigue.
The shaft is a metal material, which will be subjected to a large torque for a long time during use. The internal material of the shaft will gradually produce gaps, and the unbroken part will gradually yield and eventually break under the action of the torque.
② The tension of the V-belt is too large.
If the tension is too large, it will inevitably lead to a significant increase in the stress of the shaft during the working process, and even exceed the maximum strength of the shaft, which directly leads to the brittle failure of the shaft. Even if no brittle failure occurs, the internal force of the shaft will increase significantly. Fatigue failure of the shaft occurred early.
③ The shaft material is poor.
The torsional strength of different materials is quite different. If the texture of the material is poor, it will inevitably lead to low torsional strength and brittle failure easily.
Repair measures for shaft fracture
From the above analysis, it can be found that the cause of shaft fracture is not only the problem of the shaft material itself, but also human factors. To solve the problem of shaft fracture, we need to start from the following aspects:
① When purchasing a shaft, you must choose a regular manufacturer, and the purchaser must also conduct a detailed inspection of the product to ensure that there is no problem with the material itself.
② Transmission with materials is prohibited.
③ Strengthen daily maintenance and inspection, and check the shaft regularly. Once it is found to be bent or deformed, it must be replaced in time to avoid damage during transmission.
④ Adjust the tension of the V-belt, and reduce the tension of the V-belt as much as possible under the premise of ensuring normal transmission.
Causes of transmission failure
Transmission failure is also a common failure during use. Once the failure occurs, the equipment will be unusable, which will seriously affect production. At the same time, transmission faults are also more complicated, and there are greater difficulties in maintenance.
The more common transmission faults include wear of the flexibledisc coupling, cut off the connecting screw of the protective cylinder, cracking of the protective cylinder, damage to the bearing of the belt pulley, and tear of the petal-shaped belt.
According to experience, an important cause of transmission failure is the unreasonable control of the radial and lateral spacing. If the spacing is too small, it is easy to cause wear and tear between the peripheral chamber and related components, and ultimately lead to transmission failure.
Repair measures for transmission failure
In view of this failure, we can start from the following aspects:
① Perform preventive inspections on the transmission part on a regular basis. In the inspection process, pay special attention to the longitudinal and lateral spacing of the bearings to ensure that the spacing meets the requirements. It is also necessary to add lubricating oil in time to avoid serious wear.
② Open the middle protection tube every 3 months to replace the flexible disk and flap belt, and check and tighten the screws at each part.
③ Check the bearing support every week and add lubricant in time.
④ Observe the operation of the equipment. If there is an abnormal situation, stop the operation and perform a system inspection to avoid larger accidents.
Reasons for high bearing temperature
Although the bearing temperature is too high, it will not immediately have a direct impact on production, but if the high temperature continues for a long time, it will inevitably have a greater impact on the service life of the bearing. There are two main reasons for the excessively high bearing temperature:
① Working hours are too long.
Long-term work will inevitably generate a certain amount of heat, which will promote the volatilization of lubricating oil, and the volatilization of lubricating oil will further increase the friction and increase the temperature.
② There is insufficient lubricating oil.
Countermeasures for excessive bearing temperature
① Reasonably arrange the operating time of the equipment, improve the operating efficiency of the equipment, avoid the equipment from working continuously for a long time, and turn off the equipment in time when it is not needed.
② Regularly inspect the bearings and add lubricating oil to avoid excessive temperature caused by insufficient lubricating oil.
The screen surface ages faster
The main factors affecting the aging of the screen surface are the structure, material and tension of the screen surface.
① At this stage, most of the vibrating screen surfaces used in circular vibrating screens are polyurethane screen surfaces, that is, a layer of polyurethane is covered on the screen surface. The anti-aging performance of polyurethane itself is not very high, which will cause the aging speed of the screen surface. accelerate.
② In addition, most workers will not tighten the screen surface when installing the screen surface, which is also one of the reasons that accelerate the aging of the screen surface.
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Countermeasures for the rapid aging of the screen surface
Do the following three points:
① Need to choose high-quality screen surface;
② When installing the screen surface, it is necessary to tighten the screen surface as much as possible;
③ The screen surface that has been aging and cannot be used needs to be replaced in time to avoid larger problems.
