material to be screened is fed on to the centre
of top screen. The undersize material passes
rapidly though the screen during its travel
to the periphery. The over size material is
continuously discharged through a tangential
outlet. Vibro Sifter sare equipped to handle
multiple screens one on top of the other with
feed trays in between to give several precise
sized fractions in a single screening operation.
Special designs with up to seven screens are
also available for grading.
The top weight on the motor
shaft rotates in a plane close to the centre
of mass of the assembly. Rotation of the top
eccentric weights create vibration in the horizontal
plane which causes the material to move across
the screen cloth to the periphery. Increasing
the top eccentric mass increases the horizontal
throw causing oversize material to discharge
at a faster rate.
The bottom eccentric weights
rotate below the centre of the vibrating mass
creating tilt on the screens giving vibration
in vertical and tangential planes. Increasing
the vertical component of motion promotes turn
over of material on the screen surface helping
maximum quantity of undersize material to pass
through the screen. The effective vertical motion
helps in minimizing blinding of screen.
The tangential component of
motion is controlled by the angle of lead given
to bottom weights with relation to top weights.
Variation in lead angle controls the spiral
pattern of material travel over the screen cloth.
Speed and Flow pattern of material travel over
the screen cloth can be set by the operator
for maximum through-put and screening efficiency.
Typical material travel patterns generated at
various lead angles are shown below.
Capacity - Gyroscreen gives greater
capacity per meter square of screening
area and oversize material is discharged
with relatively less percentage of fines
when compared to other screening machines.
Blinding – Gyroscreen multi-plane
action limits screen blinding to an
acceptable minimum. However, for material
having inherent blinding characteristics,
we offer anti-blinding accessories to
Screen Life - Screen cloth is
held in uniform tension on specially
designed mesh frames. The tight screening
surfaces vibrates rigidly without flexing
of wires, greatly reducing screen wear
and increasing screen life.
Transmitted Vibration –
No special flooring foundation is required.
The Vibro Screen may be placed wherever
required, like on the top of bins, on
wooden floors, or light structures.
- For equivalent capacity, Vibro Screen
requires less space than other screening
systems. Compact units can fit right
into existing Production Lines.