| 摘要 |
The invention relates to a device comprising a rotationally mounted drum, which is flown through by a fluid from the exterior to the interior. The stable casing of the drum is provided over the periphery thereof with a sieve-shaped hole structure. The inventive device also comprises permeable outer bellows, which radially cover the casing on the exterior. One more support such as wire gauze is optionally placed between said outer bellows and the sieve drum casing in order to increase the distance between the sieve drum casing and the outer bellows. According to the invention, a tensioning element, which extends in an axial direction and which is enlarged at least once in a radially direction over the working width of the sieve drum, is mounted in a manner that enables it to be axially displaced in order to tension, in any case, the outer bellows with the sieve drum lateral surface between the outer surface of the sieve drum casing and the inner surface of the outer bellows. After the tensioning element is displaced in an axial direction, the outer bellows are brought into frictional contact in an all-over manner with the sieve drum lateral surface whereby preventing the formation of folds in the outer bellows over a long period of time. |
