To solve the main bearing of ball mill new ways of expanding gap is too small

Wuhu power plant boiler no. 13 of Shanghai boiler plant production of ultra-high pressure, single steam drum, natural circulation, storage type pulverized coal furnace, the model of SG - 42/13. 7 - M418 type with 2 sets of shenyang heavy machinery factory production of DTM320/580 steel ball mill in January 2001, 13 furnace b steel ball mill maintenance, be stripped away the bearing cover, check the measuring found after bearing clearance C = 7 mm, obviously too small ( Normal expansion gap should be greater than 20 mm) 。 Such as can not solve the problem, because of the coal mill body free expansion, hollow axle gear oil ring and the bearing friction, seriously affect the safe running of coal mill. As is solved by conventional methods, must be the top coal mill large pot, will be left in mill housings backward-shift, for bearing seat look is leveling, so need to spend a lot of manpower material resources, and maintenance cycle is long, affects full load operation. But if you can make the inner diameter of the bearing seat b side D1, D2 is greater than the hollow axle gear oil ring diameter can avoid very well because of the coal mill main bearing coal mill in inflation caused by the expansion gap is too small, make the hollow shaft and the main bearing friction, which seriously influence the safe operation of the coal mill. So we first make tool specialized tools, should be fixed in their bearing mill hollow shaft collar, find is simple, can make it along with the coal mill roll. Due to the plate of the car speed is low, as long as each cutting quantity control within the prescribed scope, can mouth inside the bearing seat after turning, usually turning 5 ~ 8 mm, can achieve the purpose of inner diameter D1, D2 is greater than the diameter, the other after considering turning prone to main bearing lubricating oil leak, and according to the shape of the turning produced corresponding to packing seal. After the above processing run continuously for more than 3 years, after bearing mill has been running stability, and their bearing seal in good condition, no oil leakage phenomenon.