GRAVITY SCREEN WITH BURDEN REMOVAL AND PORE-CLEANING MEANS

摘要

A burden removal system for removing solid burden from a stream of water. A screen (35) has an upper (36) and a lower surface (37) with pores (38) extending between them. The upper surface (36) is substantially horizontal. A drive bar (47) with a wiper blade (46) is cyclically bi-directionally driven with the blade (46) pushing burden along the upper surface (36) in one direction and rising above the burden in the opposite direction. Jet sprays (49) discharge water against the lower surface (37), preferably just ahead of the wiper blade (46) to assist the blade (46) in moving the burden and cleaning the pores (38).