Patent ID: 7344637

Claim:
An apparatus for removing fine material to be screened from waste water, comprising: a sieve grate, said sieve grate being designed to be cylindrical, said sieve grate having an inner surface, an interior and an exterior, said sieve grate being designed and arranged to be rotatingly driven, said sieve grate being designed and arranged such that waste water can flow from the interior towards the exterior of said sieve grate, said sieve grate including a supporting body and a mesh sieve, said supporting body being located at the exterior of said sieve grate, said supporting body being made of a perforated sheet metal including comparatively large openings, said supporting body being designed and arranged to provide resistance and stability to said sieve grate, said mesh sieve being located in the interior of said sieve grate, said mesh sieve being designed and arranged to form a separation surface, said mesh sieve including meshes of a comparatively small size, and said mesh sieve being fixedly connected to said supporting body; and a detaching device, said detaching device being arranged outside of said sieve grate, said detaching device including a plurality of nozzles, said nozzles being designed and arranged to spray water from outside of said sieve grate towards the interior of said sieve grate in a way to detach material to be screened adhering to the inner surface of said sieve grate.