Hand Rake Screens
WEC Projects manufactures manually raked screens from mild steel. These screens are mainly used at the inlet to a packaged or municipal sewage treatment plant.
The bars are normally spaced at 25mm apart but this can be modified to suite the application.
All steel surfaces are suitably corrosion protection.
Mechanical Screens
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In addition to our rotary type screen the latest addition to our
supply of manufactured
products is the FRONT RAKE SCREEN.
While this is new to our range in terms of
production it is by no means a new product, as our Design Engineers, Quality
Control and Project Mangers have been involved with this type of screen for
many years. We have successfully installed and have in operation working units
that can be viewed on request.
The advantages of the Water Engineering Front
Rake Screen is in its simplicity of design in the Head mounted Direct Drive
Scraper Mechanism - Twin Action Drive Chains - Precision Cut Teeth and easy
Mounting arrangements
Rotary Screens
The Rotary Screen is a mechanically raked curved bar screen
suitable for small to medium screening installations where channel depths are
not excessive.
The design of the screen is simple with a minimum of moving parts, thus
ensuring reliability and the minimum of maintenance and has no moving parts
under water apart from the rake and arms, which submerge during the raking
operation only. Two diametrically opposed rake arm assemblies rotate about a
common shaft to sweep the curved screen clean. A shaft mounted geared motor
provides the raking motion and is protected from overload by a torque arm and
overload device. The rake arms are parked in a horizontal position out of the
flow and during flow travel upwards to remove screenings. Removal of the
screenings from the rake tines is by a simple scraper mechanism as the rake
rotates.
Screen Bars
The screen body assembly comprises a grid of curved concave to the
upstream flow thus presenting the maximum possible screening area. The grid is
supported at each end and between two side plates and forms a rigid
assembly.
Rakes And Tines
Two rakes opposed at 180 are rigidly mounted on tubular arms fixed to
a common shaft. The shaft is mounted through self-aligning and sealed
heavy-duty bearings to the top of the screen body. The rakes are driven by a
shaft mounted geared motor. During engagement the rake tines protrude
completely through the spaces between the bars in the screen, thus ensuring
complete cleaning of the grid.
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