The axial vibration fault has occurred in operation of the pulverized coal exhausters equipped for boilers of 2×360 MW units.It is discovered in disassembiling repair that the looseness in fit between the inner sleeve of bearing no2 and the shaft neck appeared in operation is the cause leading to vibration fault

resulting in rubbing between the shaft neck and the raised soulder of shaft due to abrasion of inner sleeve of the bearing and main shaft.After replacing the whole set of rotary shaft and bearings

the vibration fault has been eliminated

the vibration of bearings in operation of the exhauster being in a good situation.