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SEPARATORS
1. Disk separator
2. Indented cylinder separator
3. Spiral separator
4. Specific gravity separator
5. Inclined ...
DISK SEPARATOR
 Separation - difference in length.
 pockets or indentations on its surfaces.
 smaller size materials - ...
Disk Separator
Disc
Disc in series
3
Prof. H. S. Chaudhari
 A number of distinct separations of varying length can be made
by installing combination of disk having pockets of diffe...
INDENTED CYLINDER SEPARATOR
 Separation on the basis of relative lengths like disk separators.
 It consists of a horizon...
Lifting and
dropping of
shorter seeds
into trough
Rejected
long seeds
Adjustable
trough
Conveying
augers
Intended Cylinder...
SPIRAL SEPARATOR
 separates as per there roundness.
 The main component of the separator is a stationary, open screw con...
Spiral Separator
8
Prof. H. S. Chaudhari
SPECIFIC GRAVITY SEPARATOR
 separation according to different in density or specific
gravity of the materials.
 This sep...
 The pressure or terminal velocity of the air raising through the
deck is controllable very closely within a wide range.
...
Specific Gravity Separator
11
Prof. H. S. Chaudhari
INCLINED DRAPER
 The separation due to difference in shape and surface texture.
 The mixture to be separated is fed over...
Seed hopper
Round or
Smooth
Seeds
Rough
Seeds
Canvas or
Rubber Draper
Inclined Draper
13
Prof. H. S. Chaudhari
VELVET ROLL SEPARATOR
 The velvet roll separator or roll mill separates grains on
the basis of difference in the shape an...
Metallic
duct Velvet
Roll
Rough
Seeds
Rough and
Some smooth
Seeds
More
smooth and
Some
Rough
Seeds
Smooth
Seeds
Velvet Rol...
MAGNETIC SEPARATOR
 The magnetic separator performs separation on the basis of surface
texture and Stickiness properties ...
Feed hopper
Water
spray
Iron powder mixing
Magnetic drum
Magnetic separator
17
Prof. H. S. Chaudhari
 The grain mixture is fed onto the top of a horizontal
revolving magnetic drum,
 The smooth grains that are relatively f...
 The grain mixture is passed over these magnetic drums
increased the efficiency of operation.
 The extent of difference ...
20
Prof.H.S.Chaudhari
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Types of Grains Separators- By Hema Gavit.

study of construction and working of grain separators

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Types of Grains Separators- By Hema Gavit.

  1. 1. SEPARATORS 1. Disk separator 2. Indented cylinder separator 3. Spiral separator 4. Specific gravity separator 5. Inclined draper belt 6. Velvet roll separator 7. Magnetic separator Prof.H.S.Chaudhari 1
  2. 2. DISK SEPARATOR  Separation - difference in length.  pockets or indentations on its surfaces.  smaller size materials - caught in the pockets  larger - rejected.  used for removing the dissimilar material like wheat, rye, mustard, barley from oats.  It consists of a number of disks in series fitted on shaft inside of close housing which revolves on horizontal axis.  pockets are slightly undercut on each disk, as the disks revolve through a mixture of grains, the pockets pick up short grain and drop them into a through at the side of the machine. 2 Prof. H. S. Chaudhari
  3. 3. Disk Separator Disc Disc in series 3 Prof. H. S. Chaudhari
  4. 4.  A number of distinct separations of varying length can be made by installing combination of disk having pockets of different sizes.  for only one separation - combination of disks of a same size of pockets is used.  The mixture first passes through the disk with small pockets and then disks with pockets progressively larger from inlet to discharge.  three basic shapes disk pockets  The ‘R’ pocket derives its name from ‘rice’ and was designed to remove broken rice grains from whole grain.  The ‘V’ pocket derives its name from ‘Vetch’ and was design to pick up and remove round shape grains 4 Prof. H. S. Chaudhari
  5. 5. INDENTED CYLINDER SEPARATOR  Separation on the basis of relative lengths like disk separators.  It consists of a horizontal rotating cylinder which has indents on the inside surface.  The indents are closely spaced and hemispherical in shape.  short grains are picked up by the combined effect of fitting into the indents and centrifugal force.  dropped into an adjustable trough inside the cylinder.  A screw conveyor is provided in the bottom of the trough which conveys the material.  cylinder is kept at slight inclination to facilitate gravity flow of long grains in the cylinder. 5 Prof. H. S. Chaudhari
  6. 6. Lifting and dropping of shorter seeds into trough Rejected long seeds Adjustable trough Conveying augers Intended Cylinder Separator 6 Prof. H. S. Chaudhari
  7. 7. SPIRAL SEPARATOR  separates as per there roundness.  The main component of the separator is a stationary, open screw conveyor standing on one end.  The mixture is fed at the top of the unit.  The round materials of the mixture pick up speed as they slide or roll down the inclined surface, until their centrifugal force becomes sufficient enough to throw them in the outer helix.  While, the non-round materials are caught in the inner helix and are discharged through a separate spout.  rate of feeding is adjustable component.  The feeding should be such that each grains/particle rolls independently for effective separation.  device is less versatile as compared to other mechanical cleaners, but it is simple, inexpensive and quite useful for seed cleaning purposes. 7 Prof. H. S. Chaudhari
  8. 8. Spiral Separator 8 Prof. H. S. Chaudhari
  9. 9. SPECIFIC GRAVITY SEPARATOR  separation according to different in density or specific gravity of the materials.  This separator works on two principles, (1) the characteristics of grains to flow down over an inclined surface, (2) the floatation of the particle due to upward movement of air.  The main part of the device is a triangular-shaped perforated deck.  The deck is properly baffled underneath to ensure uniform distribution of air over it. 9 Prof. H. S. Chaudhari
  10. 10.  The pressure or terminal velocity of the air raising through the deck is controllable very closely within a wide range.  The mixture of grains is fed into feed box.  The air is blown up through the porous deck surface and bed of the grain by a fan at such a rate that the material is partially lifted from contact with the deck surface.  The lightest materials are lifted to the top of the stratified mass.  The heavier particles are not lifted by the air. The stratified mass moves along the direction of conveyance due to oscillating motion of the deck and is discharged at the right edge of the deck. 10 Prof. H. S. Chaudhari
  11. 11. Specific Gravity Separator 11 Prof. H. S. Chaudhari
  12. 12. INCLINED DRAPER  The separation due to difference in shape and surface texture.  The mixture to be separated is fed over the center of an inclined draper moving in upward direction.  The round and smooth grains roll or slide down with the draper at faster rate than the upwards motion of the belt and these are discharge in a hopper .  The flat shape or rough surfaced particles are carried to the top of inclined draper and dropped off into another hopper .  The belts of different degrees of roughness may be used as draper for separate materials. 12 Prof. H. S. Chaudhari
  13. 13. Seed hopper Round or Smooth Seeds Rough Seeds Canvas or Rubber Draper Inclined Draper 13 Prof. H. S. Chaudhari
  14. 14. VELVET ROLL SEPARATOR  The velvet roll separator or roll mill separates grains on the basis of difference in the shape and surface texture.  It is a finishing machine and should be used only after cleaning and separation of grain from the chaff trash.  It is effective in separation grain with rough seed coat or sharp angles from smooth surface grain 14 Prof. H. S. Chaudhari
  15. 15. Metallic duct Velvet Roll Rough Seeds Rough and Some smooth Seeds More smooth and Some Rough Seeds Smooth Seeds Velvet Roll Separator Section A-A 15 Prof. H. S. Chaudhari
  16. 16. MAGNETIC SEPARATOR  The magnetic separator performs separation on the basis of surface texture and Stickiness properties of the grains.  Since the grains do to contain any free iron, Therefore, are not attracted by the magnet.  A selective pretreatment of mixing Finely ground iron powder to feed mass is given.  The grain mixture is fed to a screw conveyor or other mixing device that tumbles and mixes the grain with a proportioned amount of water.  Due to moisture, iron powder adheres to rough, cracked, broken and sticky seed coat.  Moisture does not remain on smooth grains so no iron powder adheres to smooth surfaced grains. separation by magnetic separators. 16 Prof. H. S. Chaudhari
  17. 17. Feed hopper Water spray Iron powder mixing Magnetic drum Magnetic separator 17 Prof. H. S. Chaudhari
  18. 18.  The grain mixture is fed onto the top of a horizontal revolving magnetic drum,  The smooth grains that are relatively free of powder fall along the drum simply by gravity.  The materials with iron powder are attracted by the magnetic drum and stick to it and are removed by rotary brush or break in the magnetic field.  Most magnetic separators have two or three removing magnetic drums operating In a series. 18 Prof. H. S. Chaudhari
  19. 19.  The grain mixture is passed over these magnetic drums increased the efficiency of operation.  The extent of difference in seed coats, amount of water mixed, amount of iron powder and thoroughness of powder-water mixing operation affect the degree of successful separation by magnetic separators. 19 Prof. H. S. Chaudhari
  20. 20. 20 Prof.H.S.Chaudhari

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