The the DTM320 of Wuhu Power Plant No. 13 furnace, Shanghai Boiler Plant production of ultra-high pressure, single steam drum, natural circulation, the silos pulverized coal, model SG-42/13.7-M418 type, configuration, two sets of Shenyang Heavy Machinery production/ 580 steel milling January 2001, on the 13th furnace b ball mill repair, thrown off the emperor bearing the superstructure, check measurement found emperor bearing expansion gap C = 7 mm, obviously too small (normal expansion gap should be greater than 20mm). Can not solve the problem, blocked the free expansion of coal mill body, the hollow shaft slinger and bearing friction, seriously affecting the safe operation of the coal mill. Resolved by conventional methods, to be top of the the Pulverize tank, coal pulverizer emperor bearing up bearing leveling alignment, in which case requiring substantial investment of manpower and resources, and maintenance of long life cycle, affecting the unit at full load run .
Make the main bearing side inner diameter D2 is greater than the hollow shaft gear oil ring outer diameter D1 can avoid expansion due to the coal pulverizer main bearing clearance is too small cause of Mill expansion blocked, so that the hollow shaft conflicts with the main bearing, which can seriously affect the issue of coal pulverizer safe operation.
We first make the aircraft turning tools, special tools, will be fixed in the coal mill emperor bearing hollow shaft sleeve parts to carry out simple alignment, so that it can rotate with the coal mill. Low speed turning, as long as each time turning the volume control in the regulation
Within the given range, you can port after bearing turning, turning 5 to 8 mm in normal circumstances, you can reach inside diameter
D2 is greater than the outer diameter D1 of the purpose, and the other considered prone to turning to the main bearing lubricant leakage, According to the form after turning
Like production of the corresponding packing seal.
Continuous operation for more than three years after the above processing, the coal mill emperor bearing has been stable, and the emperor bearing seals, no oil leakage phenomenon.
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