Weather-resistant drive for tank scraper bridge used in waste water treatment plant, has track on vertical outer wall or on horizontal underside of projecting wall section

摘要

Drive wheel (6) track, is on the vertical outer wall (21) of the settlement tank (30). It is alternatively the underside of a projecting wall section. The drive axis (40) vertical or horizontal, as appropriate. Preferred features: The scraper comprises a traveling supportive framework (3) or bridge, with axles for wheels (1) running on the crest of the tank edge. The bridge has a supportive section projecting over the tank edge, to carry the drive wheel (6). The projecting wall section is integrally connected with the wall of the tank. A weather shield is placed over the vertical wall section to keep all precipitation off. It is a sheet metal rain deflector or a wall profile. An arrangement pivoting the drive wheel against the tank under spring loading is provided. The drive unit is also mounted to pivot. Variants of the drive wheel arrangement are described, assuring adequate drive friction, in accordance with the foregoing principles. In one example, drive and drive wheel are arranged on a horizontal carriage with a weight and wire rope providing normal force between drive wheel and track. A pneumatic tire is employed.