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Application Screening of civil and industrial waste water
Characteristics The machine is equipped with a fixed bar screen and a bucket controlled by two drive units, one for the vertical motion and one for the opening and closing.
Operation The coarse bodies in the waste water are stopped by the bar screen. This material is removed by the moving bucket and discharged in the upper part, out of water.
The bucket is guided by two trolleys which are driven by two cable systems (one for the vertical motion and one for the opening and closing).
Materials Compact machine: hot dip galvanized carbon steel or stainless steel. The control parts are always above the water level.
Installation In a concrete channel.
Channel width From 1000 to 3000 mm.
Degree of filtration From 15 to 100 mm.
Advantages Suitable for very deep channels, even with sand on the bottom and/or large size solids.
Disadvantages Not suitable for small or shallow channels.
Optional Torque limiting device to measure the bucket/rake stress with alarm and/or machine shutdown. Walkway and ladder to reach the top mechanical members.



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 bucket has reached a pre-set position out of water and the material collected has been discharged.
The machine is controlled by no. 2 geared motors, one for the bucket lifting and lowering and the second one for its engagement into the bar screen and then for its disengagement.
In the drive unit upper part, there are no. 3 drums (no. 2 side drums + no. 1 central drum). They are driven by a geared motor and they wind and unwind the cables which lift and lower the screening bucket/rake.
The second geared motor operates a pulley which controls the bucket/rake operation by winding and unwinding the central cable. 
During the lowering phase, the bucket is in open position and remains open as long as the lowest position is reached.
When the bucket lays on the bottom, the traction cable is loosened and a limit switch intervenes to stop the motor (this limit switch is connected to the cable).
Then, the first geared motor rotation direction is reversed, the second geared motor starts up to wind the central cable and the bucket/rake is inserted into the bar screen.
So the bucket/rake is lifted again and during the lifting phase it cleans the bar screen and holds the screened material inside.
Before the bucket gets to the top position, it is cleaned by a special device and the screened material is discharged 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 bucket go down again.
Meanwhile, the second geared motor moves the central drum which separates the screening rake from the bar screen.
During the lowering phase, the bucket/rake remains far from the bar screen.


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.