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Gyratory Screen

Gyratory screens, also known as vibro screens or gyro screens, are circular vibrating screens that use imbalanced weights on a motor to produce precise vibrations for screening materials. Materials are fed to the center of the top screen and undersized materials pass through while oversized materials are discharged tangentially. The top weights create horizontal vibrations while bottom weights create vertical and tangential vibrations to control material flow over multiple screens. Key features include greater capacity, minimum blinding, longer screen life, and compact size. Gyratory screens are used in industries like food, ceramics, paper, oil, plastics, chemicals, and metals.

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Pradyumna Padukone
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507 views2 pages

Gyratory Screen

Gyratory screens, also known as vibro screens or gyro screens, are circular vibrating screens that use imbalanced weights on a motor to produce precise vibrations for screening materials. Materials are fed to the center of the top screen and undersized materials pass through while oversized materials are discharged tangentially. The top weights create horizontal vibrations while bottom weights create vertical and tangential vibrations to control material flow over multiple screens. Key features include greater capacity, minimum blinding, longer screen life, and compact size. Gyratory screens are used in industries like food, ceramics, paper, oil, plastics, chemicals, and metals.

Uploaded by

Pradyumna Padukone
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Gyratory Screen

Circular vibrating screens are designed for precision screening


operations. The vibrations are produces by the two imbalanced loads/
peculiar weights mounted on double ended heavy duty electric motor. This
motor will create the required vibration in such a way that the material in
the machine will be getting screened. At the time of operation the material in
the screen will move the perimeter of the screen and gets out through the
out let, both the wanted & unwanted material in different outlets. Such
screens are mostly known as "vibro screen" or "gyro screen" but also
sometimes known by the names mesh screening machines, screener,
vibrator, sifter, grader, classifier, separator, sorter or filter.

The material to be screened is fed on to the center of top screen. The


undersize material passes rapidly though the screen during its travel to the
periphery. The oversize material is continuously discharged through a
tangential outlet. Vibro sifters are 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
center of mass of the assembly. Rotation of the top eccentric weights creates
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 center of the vibrating
mass creating tilt on the screens giving vibration in vertical and tangential
planes. Increasing the vertical component of motion promotes turnover of
material on the screen surface helping maximum quantity of undersize

PDP@RNSRPM
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.

Key feature of vibro screen

Greater capacity - gyro screen 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.
Minimum blinding- gyro screen multi-plane action limits screen
blinding to an acceptable minimum. However, for material having
inherent blinding characteristics, we offer anti-blinding accessories to
eliminate blinding.
Longer screen life- screen cloth is held in uniform tension on
specially designed mesh frames. The tight screening surface vibrates
rigidly without flexing of wires, greatly reducing screen wear and
increasing screen life.
No 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.
Minimum space requirement - for equivalent capacity, vibro screen
requires less space than other screening systems. Compact units can
fit right into existing production lines.

The Gyratory screens find wide use in various application like in Food
industries, spices, flour, agro industries, wheat, sesame, whole spices,
soya, ceramics industries, zircon, glazed tiles, china clay, paper
industries, paper board, oil industries, agricultural fields, plastics
industries, PVC resin, pigments, emulsions, varnish, chemicals industries,
metal industries, Ferro alloys, cast iron powder, foundries etc.

PDP@RNSRPM

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