If the coupling is not well aligned, it will cause the bearing to heat up or fail.
The input shaft of most operating equipment is connected to the power shaft through the coupling, so the alignment of the coupling must be performed during assembly so that the drive shaft and the driven shaft are on the same axis. 80% of the heating of the motor tile is caused by poor alignment. Such as PY company raw material grinding reducer motor tile.
XC's cement mill reducer coupling itself has too much machining error, resulting in poor alignment, high motor bearing temperature and large equipment vibration. In addition, during the installation process of the coupling, it is necessary to pay attention to the relative position mark of the coupling end of the active end and the driven end to avoid too much deviation of the pin hole and cause the pin to be installed too tightly.
Rotor imbalance
Some rotors are subject to corrosion of the medium or wear of solid impurities during operation, or the shaft is bent, resulting in unbalanced centrifugal force, which causes the bearing to heat up, vibrate, and the raceway is severely worn until it is destroyed. This is especially important for circulating fans in the mill system. Due to the serious wear of the impeller, the balance of the rotor after wear is poor, and the vibration of the fan is large, which often causes the bearing to fail prematurely.
Check replacement is not timely
If the bearing is found to have severe fatigue flaking, oxidative corrosion, worn pits, cracks, and hardness reduced to HRC<60, or if excessive noise cannot be adjusted, it should be replaced in time. If the inspection or replacement is not timely, it will cause the bearing to have heat, abnormal sound, vibration, etc., or even serious damage to the rotor, thus affecting normal production. In addition, the improper vibration of the bearing and the looseness of the equipment's anchor bolts may cause indentation of the bearing raceway and the rolling element, and cracking of the inner and outer races of the bearing. During the operation of the bearing, the inspection shall be carried out according to the specified cycle.
Bad bearing quality
Rolling bearing parts work in the form of point contact or line contact for a long time under high alternating contact stress. The accuracy, longevity and reliability of the mainframe are largely determined by the bearings. Whether it is an ordinary bearing or a special special bearing, the mainframe puts high demands on its life, performance and reliability. Therefore, in the purchase and acceptance of the bearing must pay attention to inspection, first of all to use the products of regular brand-name manufacturers, the key parts even use original imported bearings, such as SKF bearings, NSK bearings, TIMKEN bearings and FAG bearings. Special parts should be specially designed, such as bearings for roller presses and vertical grinding rolls.
Although the rolling mill bearings of PY and JY have been specially ordered, due to the unstable quality of large-scale domestic bearing manufacturing, there has been a phenomenon of pitting and peeling on the inner surface of the rolling ring, causing the bearing to be fever and the roller press to frequently stop.
Improper bearing selection
When selecting the bearing, pay attention to the limit speed and load capacity of the bearing, and do not exceed the speed and overload.
