Report on seperator

1. Project Report ofSeparator/Classifier
Group 2
 Muhammad Awais Talib
 Arslan Abdullah
 Luqman Arshad
 Huzaifa
 Asif Nawaz
 Hafiz M. Usama
 Mubashir Hassan
 Musdaiq imtaiz

2. Abstract
Effective separation of grains is an important process in the industrial utilization of the
constituents. In view of the limitations of the separator employing a multi separation process .
Machine parts were designed following standard engineering principles using locally available
materials. Separator classified by sieve analysis, and the fractions retained on the 2.5 and 5 mm
sieves were used for the evaluation of the machine performance. Operating the separator at 715
rpm yielded grain recovery is 96% retained on 2.5 mm sieves. Corresponding grain recovery
and capacity of seprator at the 715 revolution per minitue is 100, 81.71, 78.45% and 70 kg/h,
respectively. Separation of the retained materials on 5 mm sieve . The results showed that the
separation technique is viable for effective separation.
Objectives
1. To promote separator and provide basic information about it .
2. To educate the local people about the benefits of separator .
3. To promote interpenerorship and new bussiness ideas in the students .
4. To improve the functioning of separator in industry.
Introduction:
A sieve, or sifter, is a device for separating wanted elements from unwanted material or for
characterizing the particle size distribution of a sample, typically using a woven screen such as a mesh or
net or metal. The word "sift" derives from "sieve". In cooking, a sifter is used to separate and break up
clumps in dry ingredients such as flour, as well as to aerate and combine them. A strainer is a form of
sieve used to separate solids from liquid
Definition:
Sifter machine refers to a vibratory sifting device which is designed to carry out separation,
gradation and scalping functions. It is a circular unitary rotating screen that you primarily use to separate
and to grade different forms of materials in bulk.
Operation: Sifting, in its simplest form, employs the well-known principle that, in a dry material made
up of various particle sizes, agitation of the material will causemass. When the material is confined in a

3. container having a bottom opening, or openings, all the particles small enough will tend to pass through
the openings while the larger particles will be retained.
The speed and efficiency with which this separation by particle size takes place is largely determined by
the individual size and weight of the smaller particles, the pressure exerted on them from above by the
large particles, the amount and type of agitation employed, and the number of openings available. Sifter
Parts & Service screens are the result of engineering experience and skill in incorporating the above
outlined characteristics into a modern sifting machine, capable of continuous, efficient operation under
normal service conditions. In operation, the Gyratory Sifter receives the material to be processed at a rate
which does not exceed the capacity of the sifter. The sifter box becomes the container or containers, for
the material, and the sieves provide the openings through which certain particles are able to pass.
The movement necessary to cause the smaller particles to reach the openings and pass through them is
provided by a motor drive which rotates the sifter box at a rate of speed which has been found to provide
the most efficient results. As the particles pass through the sieve openings, they fall onto an inclined
collecting tray which directs their flow to a lower sieve or to a sifter outlet. The particles too large to pass
through the sieve openings pass over the end of the sieve and onto another sieve or to another sifter outlet.
To prevent any material from lodging in or blocking the sieve openings, cleaners are frequently provided
which act upon the underside of the sieve cloth. Various types of sieve cleaners are available, but the most
common method is to use small rubber balls. These balls ride on a coarse wire screen and are confirmed
in compartments.
When the sifter is in motion, the balls bounce constantly from the ball carrying wire to the underside of
the sieve to dislodge any particles blocking the sieve openings.
Working method:
The theory was set to evaluate the probable dispatch angles for grain particles.
Dispatch angle was defined as the angular displacement from the lowest point in the drum (where the
particle was fed) to the point where the particle was dislodged from contacting the surface of the drum
that is,where the gravitational force on the particle just overcomes its centrifugal force as the drum rotates
. The motion of each particle in the rotating drum is controlled by its inertia, centrifugal and gravity
forces,and the coefficient of friction at the particle-drum interface. It was assumed that the drum is
rotating at a specified angular velocity, and that, the particle was fed into the drum at its lowest point,
without impact, such that, bouncing does not occur.
Components ofthe separator

4. Fig. 2.1: Components of the separator
(1) frame (2)belt, (3) Motor (4) trough, (5) top screens,(6) Bottom (fine mish) screen(7) connecting
Rod
Process:
In many applications, it is desirable to accomplish more than one of the above types or degrees of
separations. For those installations, each of the Sifter Parts & Service Sifters can be furnished with one or
more screens to deliver various separations.
Generally speaking, the Sifter Parts & Service Sifters find application in four locations with respect to any
process
1. Ahead ofthe Process.
Here are the advantages can be two-fold. First, for sanitation to scalp off foreign material
from incoming product; second, to remove the material which is desired size before . This
can increase capacity or quality of the separation.
2. Within the Process.
The main function of a sifter within the process is to classify according to particle size.
Additional advantages can be seen as increased productivity or reducing the size of the
mill necessary on new installations. This can be accomplished by removing the desired
product before regrinding the oversize.
3. After the Process.

5. This application would be similar to that previously mentioned. The sifter could be used
to remove over and undersize material from good product. The sifter could also classify
the finished product into severalfractions or grades for packaging. An example would be
the screening of cracked corn into severalsizes – coarse,medium, fine and meal.
After Storage:
It is often possible that the finished material, after classification, is moved into storage
bins or hoppers, to await packaging or bulk load out. During this storage, there is always
the possibility of contamination with foreign material – or because of pressure and
moisture, a tendency to form lumps. Many processors find it advantageous to use a CS-1
Sifter just ahead of final packing or bulk load out.
Fig.2.2: sepearator or sifter

6. Fig.2.3: Third-angle-orthographic-projection-of-sieving-machine
4. Conclusion
A separator was developed, based on the motion of granular particles of dissimilar shapes in a
rotating drum. A rotary separator for grains the was developed, based on the motion of granular
particles of dissimilar shapes in a rotating drum. Separation of the mixture was feasible at low
rotational speeds of the drum.715 rpm for mixture of grain retained on 5 mm sieve, and other
material on 0.5 mm sieve and capacity 70 kg/h; separation efficiency, 78.5 and 73.7%. The
machine thus provides a viable technique for the practical separation of dry palm grain and
cleanable material.

7. References
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http://www.physicsforums.com/showtread.php?t=201254, retrieved: 13th of February, 2009