ROSTA
2.35
Oscillating Mountings
Hanging gyratory sifters
Hanging gyratory sifters are almost exclusively used in the
milling sector for the sorting of the different types of flour
(white flour, dark flour, black flour). These screens, which
are equipped with a central unbalanced shaft, normally
hang from the building ceiling on rattan or round fibre-glass
rods. Due to the relatively high weight of the screening ma-
chines, several rattan or fibre-glass rods are needed at each
corner of the box to ensure the suspension. In cases of very
high humidity in the buildings, both types of rods can slip out
of the clamps. Furthermore, it is very difficult to set it up so
that all the rods support approximately the same weight.
For these applications, ROSTA recommends the use of the
AV mounts, which have a very high carrying capacity. Only
one mounting set is thereby needed for each corner of the
screening box. In addition, the AV mountings can be deliv-
ered with right-hand and left-hand threads, which facilitates
the horizontal adjustment of the box. The AV mountings have
a long service life, and do not have to be periodically re-
placed, as it is the case with the rattan rods.
Upright staying gyratory sifters with eccentric shaft drive
Upright staying gyratory sifters with unbalanced shaft drive
Upright staying gyratory sifter machines frequently have this
classical type of crank drive. These screens are mainly used
in the flour processing sector, as well as in chipboard manu-
facturing plants. An eccentric shaft driven by belts transfers
the circular movement to the screen box. The screen box is
supported by four legs, each consisting of two ROSTA uni-
versal joints. The weight of the box lies completely on the
four supports, which accurately guide the box movement.
A very cost-efficient version of the upright staying gyratory
sifter. Requires no complicated eccentric drive. The AK
mountings or even the AV mountings must be over-
dimensioned, however, due to the lack of a precisely defined
guidance.
Please contact ROSTA for projects using upright staying gy-
ratory sifters with unbalanced shaft drive.