Ball Mill Roller Bearings

Ball Mill Roller Bearings

Ball mill roller bearing temperature anomaly will affect production schedule? The reasons and solutions are here. Roller bearing is the core part of rolling mill. It can run in the complex environment of high temperature, impact, heavy load and low speed. Therefore, various failures can occur if improper maintenance is performed. In particular, abnormal temperature of roller bearing will lead to frequent shut-off of power switch of grinding machine, which will seriously affect production schedule. Today, we have summarized the common causes and treatment methods of abnormal temperature of roller bearing, in the hope of bringing production help to us.

Insufficient lubrication

Cause analysis:

The reason for the oil shortage is usually because the type of oil selected is a problem. In general, the higher working temperature of mill roller bearings, bearing inner temperature is close to 200 ℃. If the type of lubricant is not correct, the oil used for lubrication will deteriorate or evaporate due to high temperature and pressure, thus losing the function of protecting and lubricating roller bearings, which will increase the heat bearing generated by roller friction. This leads to an abnormal increase in bearing temperature. In addition, if the lubricant is too small, or the lubricant is not replaced in time, the original function of the lubricant may be lost, resulting in insufficient lubrication of roller bearings, resulting in higher bearing temperature. Leading to premature bearing damage.

Practice:

To ensure lubrication of ball mill roller bearings, viscosity and more stable synthetic oils must be selected at high temperatures when lubricants are selected. When the bearing runs for four months, the oil must be replaced in time, and the lubricating oil should not be less than 40 liters.

Roller internal bearing into a lot of powder

Cause Analysis:

If a ball mill internal bearing enters a large amount of powder, the powder will bind with the lubricant and become a viscous and poorly flowing mixture of powders and oils, not only will not play any lubrication of the bearing, but also Increase the wear of the bearing, so that the temperature of the roller bearing is abnormally increased.

Approach:

When it is found that the powder enters into the bearing and causes an abnormal increase in bearing temperature, the oil seal must be replaced immediately, and the quality of the oil should be reviewed to ensure that it has not deteriorated. If there is too much powder inside the bearing and the powdered oil mixture cannot be discharged with the oil outlet, then the inner end cap of the bearing can be opened, and the powdered oil mixture can be discharged through the compressed air or the hydrogen filling method, and the new filling can be added. Lubricants.

Damaged sealing system

Cause Analysis:

Sealed air system is the key to ensure that the roller seal is not damaged. Sealed air system consists of sealed fan and air duct. The blown air starts from the sealed fan and finally reaches the sealed air duct. The grinding roller mounted on the grinding disc seals the air to form a space. In this way, an annular seal cleaning system can be formed, which can not only ensure that the powder does not enter the roller bearing, but also prevent the powder from damaging the oil seal. All links are closely linked and indispensable. If any one of the links has problems, air leakage or debris will cause the pressure of the air seal ring to decrease, and the air volume will be insufficient. The annular air sealing system cannot Formation, followed by oil seal damage, powder entry, bearing temperature rise in a series of situations.

Approach:

When the roller temperature rises abnormally, the production must be immediately stopped and an investigation should be conducted. From the sealed blower, step-by-step inspections should be made in the direction of the wind so that loopholes, sealing and unsealing can be closed in time. Because the working environment of the mill is rather harsh, long-term and a large number of powders are accompanied, so the fan filter is easily blocked, so the technicians must be cleaned and cleaned as much as possible, and try to do it once every half month. And because of the high temperature in the work environment, the air duct is easy to soften or deform, or a leakage phenomenon occurs. It is also necessary to conduct a half-month investigation to kill faults in the cradle.

Roller bearing local damage

Cause Analysis:

Roller bearings are particularly concerned with the quality of the bearings, but local damage may also occur during prolonged operation, such as ball wear, interface loosening, and so on. At this point, the roller bearing temperature will certainly be abnormal.

Approach:

When the surface of the roller bearing is uneven, the local rotation is blocked, the amplitude of left and right swing increases, and the internal noise occurs; or the overload or ups and downs of the bearing temperature occur at the instant of the start-up operation of the mill, and the production must be stopped immediately, and maintenance inspection or disassembly must be performed. If the damage is serious, replace the roller bearing in time to ensure production safety.

Excessive internal grease and impurities

Cause Analysis:

At the time of starting the production, the roller bearing's running resistance was relatively large, and the grease accumulated too much.

Approach:

Immediately open the bearing side end cover and take the oil sample for testing. If the metal content in the grease exceeds the standard, it means that the bearing has worn out, and production must be stopped and the bearing replaced.

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