Threshing

1. 13. THRESHERS
RVG

4. METHODS OF THRESHING : 3 TYPES
•1. Manually
•2. Animal-drawn threshers
•3. Power threshers

9. RVG

17. RVG

19. OLPAD THRESHER:
 Olpad threshers are also used for threshing wheat crop.
A pair of bullocks pulls it around over the dried crop spread in a circular form on the threshing ground.
Threshing is continued till the entire material becomes a homogeneous mixture of grain and ‘bhusa’ (chaff).
It consists of about 20 circular grooved discs each of 45-cm diameter and 3-mm thickness placed 15 cm apart
in three rows.
 An operator’s seat is provided on the frame to control the movement of animals.
All discs are mounted staggered to give more effective cutting of the straw.
It has 3 or 4 wheels to facilitate its movement from one place to other.
Threshing by this thresher is fairly efficient and cheap but is quite slow with low output capacity.
 This machine can be used for threshing wheat, barley, gram etc.
 Olpad Thresher is made by former in Olpad Village, Gujarat State.
600 kgs of wheat and 1100kgs of wheat straws comes from 16 hours threshing.

20. Olpad thresher

21. TUBULAR HAND MAIZE SHELLER

22.  Maize being an important crop of India, mechanical shellers are in great demand by the growers. Even small and marginal
farmers need manually operated (hand held) or table mounted maize shellers.
 The traditional method of separating kernels from cobs by pressing with fingers or with sickle is tedious operation. The
simple hand tools developed can be successfully used by the growers of this crop in small plots yielding small quantity of
grain.
 The three models are made of G.I. Pipe at a minimum cost. The capacity of these shellers ranges between 25 and 50 k g
of grain per hour..
 Maize sheller is used to remove corn pearls from the cobs.
 Tubular hand maize sheller is a simple metal pipe of diameter 65 mm and length 70 mm with four tapering blades or
vanes welded on the inner surface of the pipe equally spaced.
RVG

23. * The pipe is made of 1 mm thick mild steel sheet. The sheet is rolled over a cylindrical mandrel (to form the
cylindrical shape) and is welded at the ends.
* The vanes are 55 mm in length and are tapered from a width of 27 to 22 mm. These vanes are bent in „L‟ shape and
bottom portion of vane is welded to the inner surface of the cylinder.
* One leg of the vane will be supported by the inner cylindrical face and the other will project radially towards the
centre and acts as the shelling element.
* These four vanes are placed at an equal interval of 90 degrees.
Construction details of tubular hand maize shellers

24. THANK
YOU
RVG