Judgment of roller bearing damage degree and appropriate technical treatment

1. Observation: If the roller bearing is well lubricated and there is no debris and moisture entering, it indicates that the oil seal of the bearing is not worn. If the original bearing box is opened, the bearing should be visually inspected and the oil seal should be checked regularly. Check the condition of the oil seal near the bearing to ensure that they are sufficient to prevent hot liquid, corrosive liquid and gas from penetrating into the bearing along the axis. If the oil seal is damaged, replace it as soon as possible. Check the automatic lubrication system to ensure that the oil or grease enters the bearing, and to ensure the correct amount of addition. At the same time, check whether the lubricant is discolored or blackened. If this is the case, it usually means that the lubricant contains impurities, which is the use of the bearing. It is also harmful.

2. Listening: It is a very common method to use hearing to recognize irregular operation. For example, using a screwdriver or electronic stethoscope to detect a streamlined abnormal noise is a method often used by experienced operators and maintenance personnel. If the bearing is in good running condition, it will make a low whining sound, such as sharp hissing, squeaking and other irregular sounds from the bearing, it may indicate that the bearing is already in a bad running state. Up.

3. Touch: High temperature often indicates that the bearing is in abnormal condition. High temperature is also harmful to the lubricant in the bearing. However, the high temperature of the bearing is caused by the lubricant in the rolling bearing. Operation will reduce bearing life. The reasons for the high temperature of the bearing include insufficient or excessive lubrication, impurities in the lubricant, excessive load, bearing damage, insufficient clearance, and friction caused by the oil seal. Under normal conditions, the bearing will have a natural temperature rise just after lubrication or after lubrication and it will last for one to two days.

(1). Check whether the cooling water pressure, water flow and piping system are normal. If the water pressure is low, it may be that the filter is clogged. If it cannot be processed in time, it can be shut down for processing. When it is confirmed that it can work, it can be put into use.

 (2). Check the oil pressure of the governor. If the oil pressure is low, it may cause the cooling water hydraulic valve to close.

 (3). Check whether the bearing has abnormal noise, and check whether the rolling bearing swing is abnormal.

 (4). Take an oil sample to observe whether the oil color has changed, and conduct a laboratory test to see whether it has deteriorated. If the deterioration is confirmed, the machine should be shut down and replaced with new oil.

 (5). Check whether the oil level of the oil level is normal. If it is abnormal, check whether the drain valve of the oil tank is closed tightly. If it is closed tightly, oil should be refilled. If the sealant is leaking oil, it should be shut down.