OPERATION DESCRIPTION

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 (lifting and lowering) and an oil-pressure unit for a strong engagement and disengagement of the 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, a limit switch stops it.
The oil-pressure piston makes the rake get deeply into the spaces between bars, then the geared motor receives a re-start signal and lifts the cleaning rake to the discharge point.
The piston is equipped with two internal proximity sensors which allow the total use of its stroke.
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 stops the motor and reverses the motion to make the cleaning rake go down again.
Meanwhile, the oil-pressure cylinder has taken the rake out of the screen.

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