The primary method of seed cleaning is the air-screen separator. It uses a combination of air, gravity, and screens to separate seed based on size, shape, and density.
These widely-use units come in a variety of models with two to eight vibrating screens. In all cases, the cleaning principles are the same.
The grains are fed into the hopper where they are evenly distributed by a feed roller and transferred through a controlled gate on the top sieve.
In the process the grains are subjected to primary aspiration by the use of air trunk which drains off chaff, straw, dust or deceased grains. Then the material is passed through sieve layer for separation according to their width and thickness.
After the separation, the graded material is subjected to air sifter and aspiration chamber where remaining light particles are sucked off by a strong upward draught of air.
The graded material and the impurities are automatically discharged in separate chutes.
These machines are suitable for efficient cleaning of all types of grains and seed.
Gentle vibratory feeder and the belt guard provide efficient cleaning of grain without causing any damage to the particles.
High in functionality, the shoes of the machine can easily be replaced for different type of cleaning. Feed cleaner is specially designed for heavy-duty operation.
Power: 5 HP
Salient Features:
Robust machine of all steel construction.
Dynamically balanced aspirator fan.
Low level feed hopper equipped with feed control gate.
Specially designed Nylon brushes to check sieve perforation clogging.
Step less variable air controls.
Air Chamber, Sieve Deck assembly and spouts are self-cleaning type.
Belt guard provided.
Sieve reciprocating provided by means of eccentric and connecting rods.
Operation:
Seeds/Grains are fed into a feed hopper where they are evenly distributed by a feed roller and drop through a controlled gate on the top sieve. Before falling on Top Screen, grains are subjected to primary aspiration which drains off chaff, straw, dust, deceased grains etc. Material is then passed through two sieve layer for separation according to width and thickness. Sieve perforations are kept cleaned by specially designed rubber balls. After passing through screens, cleaned/graded material again passes through air sifter and aspiration where remaining light particles are sucked off by a strong upward draught of air. Final product and impurities are collected separately through discharge chutes.
Varieties of Models in Seed / Grain Cleaning Machine:
Seed Cleaner/Grain Cleaner (PC - 2)
Seed Cleaner / Grain Cleaner (PC - 3)
Seed Cleaner/Grain Cleaner (PC - 5)
Seed Cleaner / Grain Cleaner (PC - 8)
Seed Cleaner/Grain Cleaner (UC - 30)
Source: http://www.agrosaw.co.in/