Rotating drum screen

GRSI

CATEGORY WATER INTAKE
TYPOLOGY SCREENS

WHEN TO USE IT

The GRSI, a rotating drum screen for micro-screening, is particularly suitable for installation in intake from sea, lake or river water, intended for cooling systemsin industrial processes, desalination, potabilization, irrigation or generalproduction processes.

HOW IT IS MADE

The machine is composed of: a sturdy cylindrical supporting structure stiffened by means of steel profiles arranged in a radial pattern, ideal for having a large free cylindrical surface which is at the same time very robust and able to withstand heavy loads such as rotation in water and the thrusts of the hydraulic flow; a series of filter panels bolted to the above structure and easily removable, each panel consists of a frame and a filter screen in square mesh or perforated sheet metal; a fixed shaft supporting the entire structure; two sturdy supports mounted on the sides of the drum and equipped with special self-lubricating bushings for continuous operation even in water, suitably sized to support the drum during rotation with respect to the fixed shaft; a gearmotor with cylindrical gears for the rotation of the drum by means of a pinion which meshes with the rack; a counter-current washing bar of the filtering surface, from the inside to the outside, complete with high pressure nozzles; a hopper for collecting the screened material and washing water; a sealing system consisting of gaskets mounted between the rotating drum and a fixed steel part mounted on the channel wall. The protection against overloads is guaranteed by standard dynamometric devices or, on request, by electronic absorption limiters. The simplicity of its design and the fully automatic cleaning allow this screen to always guarantee high performance and reliability over time.

HOW IT WORKS

The incoming water flow has an axial direction with respect to the drum; the front surface of the screen is closed and forces the flow to cross the cylindrical surface, made up of filter panels, from the outside to the inside. The water recombines after filtration and continues its motion along the axis of the drum, inside the screen, and then moves away from it. The screened material held on the outside of the screen is pushed into a hopper by the washing water which sprays from the inside to the outside of the drum.