Principle:
Agitation by Oscillation.
Particles are made to pass through different sieves placed in nests which oscillate back and forth in motion.
Construction:
Consists of a metal frame on which sieves of different no. can be mounted.
The sieves are arranged in a dissenting order of mesh size.
The metal frame is fixed using screws and a capping on a vibrating frame.
The vibrating frame is operated by an electrical motor whose speed can be controlled.
The timer helps in maintaining time of the operation.
Working:
The powder to be screened is kept on the uppermost sieve and is capped and bolted.
The machine's timer is set to the desired time (Usually 20 mins) and operated at desired speed.
The vibrations cause oscillations resulting in passing of material from one sieve to another.
After a given time the machine is stopped, the metal frame is loosed and screens are separated to collect the material.
Advantages:
Easy operation.
Less power consumption.
Economical.
Disadvantages:
Fines may generate due to attrition.
Clogging may happen if powder is not sufficiently dried.
Commonly Asked Questions.
With a well labelled diagram describe construction and working of “Sieve Shaker”.
Write a short note on “Sieve Shaker”.