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Application Screening of civil and industrial waste water
Characteristics The machine is equipped with a fixed bar screen and one or more movable cleaning rakes driven by chains.
Operation The coarse bodies in the waste water are stopped by the bar screen. This material is removed by one or more cleaning rakes and discharged in the upper part, out of water. The rake is moved by two transmission chains, partially submerged in the water to be treated.
Materials Compact machine: hot dip galvanized carbon steel or stainless steel. The chains are always made of stainless steel.
Installation In a concrete channel.
Channel width From 500 to 1500 mm.
Degree of filtration From 10 to 80 mm.
Advantages Low cost, possibility of using more cleaning rakes.
Disadvantages Difficoltà ad asportare solidi di dimensioni superiori a 300 mm.
Optional Torque limiting device to measure the cleaning rake stress with alarm and/or machine shutdown.



The machine operation is controlled by a Pause-ON timer.
If the water level upstream the mechanical bar screen should increase and exceed a pre-set threshold, a level measurer can start the machine, even during the pause phase.
The machine stop and the beginning of the pause phase is possible only whether the cleaning rake has reached a pre-set position out of water and the material collected has been discharged.
The machine is operated by a geared motor which moves the cleaning rake.
During the lowering phase, the cleaning rake is in open position and remains open as far as the lowest position is reached.
When the cleaning rake reaches the bottom of the channel, the chain makes the rake get closer to the bar screen.
So during the lifting phase, the rake cleans the bars and holds the screened material inside.
Before the cleaning rake reaches the top position, a special device cleans its internal part and discharges the material outside, into a container or on a belt conveyor.
At the top, a limit switch controls the cleaning rake operation.


1.1 Design flow rate in the channel :m³/h
1.2 Max. flow rate in the channel :m³/h
1.3 Water max. level downstream the bar screen :mm.
1.4 Water max. level upstream the bar screen :mm.
1.5 Channel width :mm.
1.6 Channel height :mm.
1.7 Discharge elevation from the channel bottom :mm.
1.8 Spacing between the bars :mm.

It is also necessary that you mention the required materials of construction.