| (57) The invention concerns a method comprising the following steps:
a) a first step of wheat accumulation and dwell;
b) a step of layering the wheat over a first vibrating screen having smaller size
holes than the wheat size and being swept by an ascending air stream;
c) a step of separating the heavy wheat fraction by passing through a second vibrating
screen having larger size holes than the wheat size and being swept by an ascending
air stream;
d) a second step of wheat light fraction accumulation and dwell which did not go through
said vibrating screen during step (c); and
e) a step of dropping the wheat from step (d), said dropping being in the form of
a thin layer and in countercurrent with respect to an ascending air stream;
and a device comprising a loading well, two vibrating screens, a discharge well, and
a suction channel.
The invention affords large power savings and considerable reduction of the whole
wheat cleaning system vertical height.
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