Large gear unit repair on a two-chamber tube mill in the Burglengenfeld cement plant in an extremely confined space
H.-D. Winter, C. u. W. Keller GmbH & Co. KG, Troisdorf-Spich, Germany
A two-chamber tube mill that is about 50 years old is still in operation in the Burglengenfeld cement plant for grinding cement. The mill with dimensions of 3.8 m diameter x 14.1 m is driven through a central drive by two three-phase asynchronous motors with a nominal rating of 2 x 1350 kW. The central drive itself consists of a single-stage cylindrical pick-off gear unit, in which the two pinion shafts are driven through planetary reduction gears on the so-called Stoeckicht principle. The large gear and the pinion shafts have double helical gearing and had to be replaced because of wear. C. u. W. Keller GmbH & Co. KG were commissioned with the replacement of these gears. They faced some serious challenges as the replacement was complicated by the confined space. The absence of drawings also made it necessary to carry out extensive preliminary design and manufacturing work in advance. Thanks to years of experience and careful planning the gear repair was completed successfully within the given time window of three weeks and the quality of the gearing was raised from the former value of 8-9 to 4-5.
Summary CEMENT INTERNATIONAL 04/2016 pp 60-69
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