World population has gradually increased and, as the result
of this increase, cultivation areas of grain group which is one of the basic
requirements of human have been expanded. As parallel with this expansion the
grain group should be stored for short and long term. Since the grain group is
not in pure situation within the place stored after harvesting, it should be
cleaned from foreign matters i.e. from grass, stones and sands. While screening
process made manually in sieves continued day after day in the past, the
systems which sieve tons of grain per hour have been developed thanks to state-of-
the-art technology nowadays. The name of this unit is pre-cleaning unit. Preclearing
consists of 5 main components as of its general structure. Drum case, drum,
upper chamber. It has high resistance against corrosion. 10,9quality class
bolts have been used as fastening element. Bolts ant nuts are dacromate plated
and have high yield strength. St 37 quality black sheet has been used for
cyclone and its parts have been joined
by means of welding. In order to increase resistance against corrosion, 2 coats
of primer have been applied and 1 coat of paint has been applied over primer.
