Positive Solutions for handling the ball mill main bearing expansion gap is too

If the main bearing ball mill expansion gap is too small, due to the mill body free expansion blocked, so that the hollow shaft slinger and bearing friction, seriously affecting the safe operation of the mill.
 
Once a power plant on the 13th oven Wuhu, Shanghai Boiler Factory production of high pressure, single steam drum, natural circulation, storage bin type pulverized coal fired boilers, model SG-42 / 13.7-M418 type, configured with two sets of Shenyang Heavy Machinery Production DTM320 / 580 steel ball mill in January 2001, the 13th ball mill overhaul furnace B, thrown off the emperor bearing cover, check the measurement found emperor bearing expansion gap C = 7 mm, obviously too small (normal for this expansion gap should greater than 20 mm).
 
If the operator in the usual manner, shall be top mill large tank, after the emperor mill bearing shift, leveling alignment of the bearing housing, such action requires a lot of manpower and resources, and a long maintenance cycle, the full impact of the unit load operation.
 
How to make the main bearing B-side of the inner diameter D2 is greater than the outer diameter of the hollow shaft slinger D1 it? Because this can be a good reason to avoid mill mill main bearing expansion gap is too small due to the expansion blocked, the hollow shaft and main bearing friction occurs, which seriously impact the safe operation of the mill.
 
So the operator first production aircraft tools special tool, which is fixed to the mill site emperor bearing hollow shaft sleeve, simple alignment, so that it can rotate with the mill. Due to the low speed of the disk drive, as long as each turning control in the specified range, after bearing can be turned inside the mouth.
 
Under normal circumstances turning 5 ~ 8 mm, can achieve an inner diameter larger than the outer diameter D1 D2 purpose, prone main bearing lubricant leakage after the other to consider turning, but also according to the shape produced after turning the corresponding packing seal.
 
However, what is surprising is that the power plant after the above process more than three years of continuous operation, the mill has been running stable bearing the emperor and the emperor bearing the seal intact, there is no oil leakage, etc. appear.