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Treatment method of high temperature bearing temperature rise

Treatment method of high temperature bearing temperature rise

2021-04-19

Bearing is a key part of machinery. It usually operates in a complex environment of high temperature, impact, heavy load and low speed. Therefore, all kinds of faults will occur if it is repaired and handled improperly.Especially the abnormal bearing temperature will cause the running machine to often power off, which has a more serious impact on the production schedule.Now, we summarized the following points, to remind you of some of the more common reasons and their treatment, hope to help you.

1. Insufficient lubrication

Reason analysis:

Lack of lubricating oil is usually due to the selection of the type of lubricating oil.Normally, the working temperature of bearings is very high.For example, the temperature inside the roller bearing is close to 200℃. If the type of lubricating oil is not right, the oil used for lubrication will deteriorate or be evaporated because of high temperature and high pressure, so it loses the protection and lubrication function of the roller bearing.

In addition, if the lubricating oil is too little, or the replacement is not timely, it is possible to make the lubricating oil lose its own effect, causing the bearing to be unable to fully lubricate, and also cause the bearing temperature to rise, thus causing premature damage to the bearing.

Treatment mode:

In order to better ensure the lubrication of bearings, in the process of using lubricating oil, the synthetic oil with relatively stable viscosity at high temperature should be selected as far as possible.Every time the bearing has been operating for four months, the lubricating oil must be replaced in time.

2. Dust enters around the bearing

Reason analysis:

Many outdoors or relatively poor conditions, very easy to cause the bearing internal into a large amount of dust, this kind of dust and oil together, into a viscous oil and the least liquid powder mixture, not only will not bring any for bearing lubrication, also could deepen bearing wear, prompted the abnormal temperature rise of bearing.

Treatment mode:

When it is found that the dust enters the bearing interior and causes an abnormal rise in temperature, the oil seal should be replaced immediately, and the quality of the lubricating oil should be tested to ensure that there is no deterioration caused.If the dust accumulated in the bearing is too much, and the powder and oil mixture can not be discharged with the oil outlet, at this time, the internal end cover of the bearing can also be opened, the powder and oil mixture can be discharged by compressed air or adding hydrogen, and then a new lubricating oil can be added.

3. The sealing system is damaged

Reason analysis:

Bearing operating normally in the key position of the machine, the vast majority of the protection of the machine are relatively sealing solution, each link closely, indispensable, if that a link in the situation, there is air leakage or debris into the case, is cause the damage of oil seal, dust in a series of case, bearing temperature rise.

For example, the sealing air system is an important link to ensure that the roller bearing is not damaged.The blown air starts from the sealed fan and finally reaches the sealed air duct.The grinding roller installed on the grinding plate of the mill seals the air into the producing space.If the sealing cleaning system is damaged, it is easy to let a large amount of dust into the roller bearing, at the same time, it will slowly destroy the oil seal.

Treatment method:

When the temperature of the roller is abnormally high, the production should be stopped immediately and the inspection should be carried out. The inspection should be carried out step by step from the sealing of the fan to the direction of the wind, so as to facilitate the early plugging of leaks, sealing and unsealing.Because the mill work site is relatively bad, there are a lot of dust, so the fan filter is easy to be blocked.Therefore, technical personnel should be frequently cleaned, as far as possible to ensure that 15 days clean once.And because the working environment temperature is high, the air duct is easy to become soft deformation or air leakage phenomenon.It should also be 15 days to carry out a inspection, the fault from the root cause elimination.

4. Locally damaged bearings

Reason analysis:

Bearing long-term operation will also produce local damage problems, such as ball wear, interface loosening and so on.At this time, the bearing temperature will no doubt be found abnormal.

Treatment method:

When the machine run have other anomalies, to produce immediately, completes the maintenance inspection or remove, check the bearing surface is smooth, local rotation is not free, swinging amplitude is increased, the internal is found abnormal noise or at the instant of the boot operation bearing temperature conditions such as overload or fluctuate,If the damage is serious, the bearing should be replaced immediately to ensure safe production.

5. There is too much oil and impurities inside

Reason analysis:

At the beginning of production, the running resistance of the bearing will be relatively large, and the oil will gather too much.

Treatment method:

Immediately open the side end cover of the high temperature bearing to take the oil sample and do a good test. If the metal content in the oil exceeds the standard, it indicates that the bearing has long been worn, and the production should be terminated and the bearing replaced.

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