5
Principle of operation:
Unclean grain flows into the conical shaped inner
screen. The inner screen hole diameter allows the
grain to pass through, keeping the large impurities
back.
Having passed through the inner screen the grain
falls onto the outer cylindrically shaped screen.
Its slot dimensions are designed to keep the grain
back and allow light impurities to fall through. The
drum containing the inner and outer screens rotates
at approx. 22 rpm.
The combi cleaner is installed at an angle of inclina-
tion of approx. 9° to the rear, causing the crop to
move across the screens as a result of the rotary
movement of the drum.
After the mechanical cleaning, the crop is carried
to an aspiration cleaner where light impurities and
dust are extracted.
The impurities from both screens are collected in a
trough at the bottom of the unit.
At the bottom of the trough is an auger carrying the
trash to the front of the unit where the screenings
may either be discharged through a separate grav-
ity outlet (e.g. used when grading malting barley)
or delivered into the trash blow line by the combi
cleaner's fan and discharged together with the light
impurities.
Oversized impurities separated by inner screen can
also be discharged separately.
Crop
Large impurities
Small impurities
Light impurities
1 Intake
2 Inner screen
3 Outer screen
4 Auger
5 Screenings outlet
6 Fan
7 Venturi
8 Scoop elevating section
9 Aspiration chamber
10 Outlet, cleaned grain
11 Air bleed
12 Outlet from inner screen
13 Outlet for small grain,
used e.g. when grading
malting barley
