Ball bearing expansion
Wuhu Power Plant No. 13, Department of Shanghai Boiler Works furnace production of high pressure, single steam drum , natural circulation pulverized coal storage bin type , model SG-42/13.7-M418 type , configuration, two sets of Shenyang Heavy Machinery production DTM320 / 580 steel milling January 2001 , 13 B furnace overhaul ball mill , thrown off the emperor bearing cover, check measurements found that the emperor bearing expansion gap C = 7 mm, obviously too small ( normal for this expansion gap should be greater than 20 mm ) . If you can not solve the problem, because of the free expansion of the mill body is blocked, so that the hollow shaft slinger and bearing friction , seriously affect the safe operation of the mill . As resolved by conventional methods required a large tank top mill , the mill will shift emperor bearing, bearing leveling of alignment , so need to invest a lot of manpower and resources, and long maintenance cycle , the impact of the unit at full load operation .
However, if the inside diameter D2 make the main bearing B side is larger than the outer diameter of the hollow shaft slinger D1, can be a good way to avoid the main bearing mill because the mill expansion gap is too small due to expansion blocked, so that the hollow shaft and main bearing friction occurs , thus seriously affecting the safe operation of the mill problems .
So we first make a special tool holder lathe , mill emperor will be fixed in the hollow shaft sleeve bearing parts for simple alignment, so that it can rotate with the mill . Due to the low speed of the disk drive , as long as the volume control at every turning gauge
Within a predetermined range of the bearing can be turned inside the mouth , generally turning 5 ~ 8 mm, an inner diameter can be achieved
Larger than the outer diameter D1 D2 purpose prone main bearing oil leak after another taking into account the turning, and turning according to shape after
Produced a corresponding shaped packing seal.
After the above processing more than three years of continuous operation , the mill has been running stable emperor bearings and bearing seals intact emperor , no oil leakage .
