EM32H - SUB-VERTICAL MECHANICAL BAR SCREEN WITH CHAINS ABOVE WATER AND OIL-PRESSURE UNIT FOR RAKE CONTROL
| Application | Screening of civil and industrial waste water |
| Characteristics | The machine is equipped with a fixed bar screen and a cleaning rake controlled by an oil-pressure cylinder. |
| Operation | The coarse bodies in the waste water are stopped by the bar screen. This material is removed by the cleaning rake and discharged in the upper part, out of water. The rake is guided by two lateral trolleys which are driven by two transmission chains. The rake engagement and disengagement is controlled by an oil-pressure cylinder. |
| 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 3500 mm. |
| Degree of filtration | From 20 mm to 80 mm. |
| Advantages | Moving/control parts above the water level, high force of penetration of the cleaning rake. |
| Optional | Torque limiting device to measure the cleaning rake stress with alarm and/or machine shutdown. Walkway and ladder to reach the top mechanical members. |
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.
TECHNICAL AND DIMENSIONAL DATA NECESSARY TO MAKE A QUOTATION
| 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.