Second, because of the sliding bearing frictional resistance is big, in the starting phase friction between shaft and bearing acceleration principle to achieve a fixed revolutions, motor to overcome a lot of friction resistance moment, generally starting current is working current 5-6 times as much.Using rolling bearing, after starting current is only about 2 times of working current.Main bearing after switching to rolling bearing, can reduce the motor power or increase the mill grinding medium load capacity, improve the efficiency of the motor. Third, after the switch to rolling bearing, because low RPM, carrying capacity is big, do not produce friction heat, so to grease can completely meet the requirements.And filling in time only a small amount of dry oil, can be regulated properly, do not need special care mill. After the fourth, the use of rolling bearing, wet grinding and cement raw material grinding device can remove bearing circulation cooling water, does not affect the bearing use fixed number of year, after rolling bearing seat with dry oil lubrication, no oil pollution phenomenon, improve the environmental health. Fifth, the use of the original mill hollow shaft processing or not processing with precision adjustment set again after the assembly of rolling bearing and the supporting bearing box.On-site installation 3-4 days can consign is used, the original foundation height the same mill.And investment in that series and effective.