Chain sludge scraper bridge

The chain sludge scraper bridge consists of a support structure anchored at the two sides of the tank that support four shafts and the chains, which are fixed to vanes that scrape the bottom and collect the suspended solids. In particular, the four shafts are arranged in rhomboidal section and fixed to the walls of the rectangular steel sedimentation tank by flanges. Two mesh chains, on which the collecting blades are mounted, rotate on the four shafts, one of which is actuated by the motor reduction unit and one by return.
The collecting blades have the dual function of sludge scraper blades and foaming blades. Moved by the motor reduction unit by the entire tank length, they convey the deposits on the bottom towards the collecting sump located at the rear tank end. At the same time, the blades convey the suspended solids to the oil remover pipe, from where they are extracted.
The deposits (sludge, sand, crystal debris, etc.) are then extracted from the collecting sump whereas the clean water overflows from the discharge channels through a spillway blade.
In order to adjust the chain tension and prevent them from being passed over by the toothed wheels, the sludge scraper bridge described in this manual is fitted with a pulley tensioning gear.

Drawing of the sludge scraper bridge with chain, model PRC 100