Precautions during bearing operation

Core tip: machine operators and equipment maintenance engineers must be highly vigilant against bearing fault signals, such as abnormal sound, temperature rise and vibration of bearings. Operators and equipment maintenance engineers of machines testing bearings in operation must keep a high degree of vigilance in the "of bearings; Fault signalrdquo;, Such as abnormal sound, temperature rise and vibration of bearing. The methods to detect the running bearing are: observation, listening and touch.
Observation: regularly open the bearing housing to visually inspect the bearing and oil seal, and check the condition of the oil seal near the bearing to ensure that they are sufficient to prevent hot liquid or corrosive liquid and gas from penetrating into the bearing along the axis.
Listening: using listening to identify irregular operations is a very common method. If the bearing is in good operating condition, it will make a low whine sound. If it makes sharp hiss, squeak and other irregular sounds, it often indicates that the bearing is in poor operation. Sharp squeaks may be caused by improper lubrication; Improper bearing clearance will also cause metal sound; The dent on the raceway of the bearing outer ring will cause vibration and cause a smooth and crisp sound; If the knocking scar caused during installation will also produce noise, the noise will vary with the bearing speed; If there is intermittent noise, it indicates that the rolling parts may be damaged; If there are pollutants in the bearing, it will often cause hiss; Serious bearing damage will produce irregular and huge abnormal sound.
Touch: high temperature often indicates that the bearing is in abnormal working condition, and high temperature is also harmful to the lubricant of the bearing. If the bearing operates for a long time at a temperature of more than 120 ℃, the service life of the bearing will be greatly reduced. The reasons for the increase of bearing operating temperature include insufficient or excessive lubrication, impurities in the lubricant, excessive load, bearing damage, insufficient clearance and high friction of oil seal, etc. Therefore, it is necessary to continuously monitor the bearing temperature.