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摘要

PCT No. PCT/EP96/02900 Sec. 371 Date Feb. 4, 1997 Sec. 102(e) Date Feb. 4, 1997 PCT Filed Jul. 3, 1996 PCT Pub. No. WO97/02081 PCT Pub. Date Jan. 23, 1997A device for removing material screened or filtered out of a liquid flowing in a channel (3), especially in waste water treatment plants, is described. The device comprises an unpowered cylindrical grating surface (8) being immersed partly in the liquid and being formed by a plurality of substantially semicircular grating bars (10) located with distance to each other. The device further comprises a removing beam (12) rotatably driven about the axis (2) of the grating surface (8) and having removing elements (15) extending between the grating bars (10) from the inside of the cylinder to the outside. A conveying device (17) for the material is provided which is positioned with respect to the grating surface (8) and leads to a point outside the liquid in the channel (3), the device having a tube-like housing (22) with an opening (23) for the entry of the material and a driven screw (20) inside the housing (22). The unpowered at least about semicircular formed grating bars (10) of the grating surface (8) are positioned with their convex surfaces facing the flow direction (5) of the liquid in the channel (3) so that the material is deposited on the outside of the grating surface (8). The removing elements (15) on the removing beam (12) extend from the inside of the cylinder to the outside between the grating bars (10) in the direction opposite to the flow of the liquid according arrows (29) through the slots (11) between the grating bars (10).