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Mode of operation
Screen selection
To obtain optimal efficiency it is important to use
screens of correct slot/hole dimensions (see screen
sizes).
Adjustment of inclination
Check that the combi-cleaner has the correct incli-
nation. A recommendable staring point would be to
set the combi-cleaner to an angle of inclination of
approx. 5°
The inclination should never be less than 4.5°, and
the max. required inclination will normally be 7°.
The inclination affects the flow velocity, the layer
thickness on the screens and, accordingly, the
cleaning efficienty.
The effect of the inclination may be illustrated
by the following general information:
Inner screens
Large impurities are arrested by the inner screen.
At increased inclination it is easier to separate the
large impurities as they move more quickly across
the screen to the outlet at the end of the screen
drum.
The large impurities will have less time to be
rotated or broken and, accordingly, pass through
the screen.
This, however, also allows the crop less time to
pass throgh the screen before reaching the outlet at
the end of the screen drum - and being mixed with
the impurities.
5°
Outer screens
The small impurities are separated on the outer
screen. The outer screen is also used in the sorting
of malting barley to separate the small-sized grains.
At increased inclination the crop will move more
quickly across the outer screen, resulting in higher
capacity and reduced separation of the small impu-
rities which are allowed less time to pass through
the outer screen.
Capacity
The cleaning efficiency will generally depend on the
capacity, as a smaller load on the screens will im-
prove the separation of impurities. Therefore adjust
the material flow to the combi-cleaner to obtain the
desired cleaning efficiency.
Do not fill more grain into the machine than can be
handled by the inner screen. If the machine is over-
filled, part of the grain will reach the opposite end of
the screen drum and mix with the screenings from
the inner screen.
The best result is obtained with dry crops;
increased moisture content reduces the perfor-
mance of the combi-cleaner.
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