Claas DOMINATOR 130, Руководство оператора

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11 Fieldwork
11.2 Description and function
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11.2.2 Threshing mechanism
Threshing is performed by drum and concave. The
bulk of the grain together with the chaff and broken
straw passes through the concave onto the prepara-
tion floor of the sieve pan. The impeller delivers the
straw and remainder of the grain to the straw walkers.
A deflector curtain behind the impeller holds back
bouncing grains and deflects them down onto the front
of the straw walkers.
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11.2.3 Straw walker
The straw walkers separate the remainder of the grain
from the straw. The straw is either removed out of the
combine through the rear panel or undergoes further
processing by special attachments (e. g. straw chop-
per). The grains separated by the straw walkers are
returned to the sieve pan via the under-walker return
floor. Crankshafts with agitator tines intensify the loos-
ening of the straw on the straw walkers.
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11.2.4 Cleaning unit
Grain mixed with chaff and broken straw is fluffed by
means of the shaking action of the preparation floor
and at the same time moved onto the sieves.
The wind blast of the cleaning fan blows the light parti-
cles (chaff) to the rear, out of the machine. The grain
falls through the upper and lower sieve into the clean
grain auger trough and is conveyed into the grain tank
by the clean grain elevator. All parts heavier than chaff
and bigger than grain travel over the upper sieve and
lower sieve, drop into the returns auger and are moved
to the returns elevator. The elevator carries the returns
to the drum for further threshing. Swinging the grain
tank unloading tube into operating position allows the
grain tank to be quickly emptied into a truck or trailer
alongside the combine.
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11.2.5 Disawning
When combining grain which is unusually hard to dis-
awn or in which it is hard to separate the seeds from
the heads or husks, additional disawning plates can be
installed in the concave.