Grain Threshers

These machines thresh and clean harvested rice, soybean, millet, beniseed (sesame) and guinea-corn by dislodging the seeds from the paricles.

Three types have been fabricated:

  1. Axial flow type ASI thresher: This model works by feeding the panicles at one end of the machine for the seeds to be dislodged with the aid of beaters as the panicles are conveyed horizontally on a concave screen. It has a mobile carriage with tyres that can enable it to be transported easily to any farm site.

    Performance indices and Specifications:

    • Capacity = 6,500kg per day
    • Winnowing or cleaning efficiency = 98%
    • Seed retention efficiency = 99%
    • Whole seed (non damage) Percentage =100%
    • Straw throwing distance from machine = 3.5m
    • Power requirement (diesel engine or electric motor) = 5HP
    • Air flow rate of winnowing fan
    • Reciprocatory speed of screen

    Features:

    • Adjustable air flow rates to suit cleaning of different grains
    • Simplicity in the design of the reciprocatory system
    • Low power consumption

    Performance indices and Specifications:

    • Capacity = 7,500kg per day
    • Threshing efficiency = 99%
    • Winnowing or cleaning efficiency = 95%
    • Seed retention efficiency = 98%
    • Whole seed (non damage) Percentage =99%
    • Straw throwing distance from machine = 12m
    • Revolution per minute (R.P.M) of threshing drum = 850
    • Power requirement (diesel engine) = 20HP
    • Air flow rate of winnowing fan
    • Reciprocatory speed of screen


  2. Centrifugal flow thresher: This machine threshes the seeds and throws the straws with the aid of a drum fabricated to have both threshing tines and fan blades that rotates above a concave screen. Unlike the axial flow model, materials that are fed though the hopper are threshed by the tines on the drum and while the straws are thrown out directly in front of the hopper at an angle of 1800. A reciprocatory screen and blower assembly further cleans the seeds.

    Features and Specifications:

    • Capacity = 5,000kg per day
    • Threshing efficiency = 99%
    • Winnowing or cleaning efficiency = 95%
    • Seed retention efficiency = 95%
    • Whole seed (non damage) Percentage =99%
    • Straw throwing distance from machine = 5m
    • Revolution per minute (R.P.M) of threshing drum = 700
    • Power requirement (diesel engine) = 10HP
    • Air flow rate of winnowing fan
    • Reciprocatory speed of screen


  3. Pedal thresher: This is a manual thresher which has pedal that is operated by leg. It has a solid threshing drum which has beaters. The materials are fed into the thresher by holding them against the beaters as the drum is actuated with the aid of the led on the pedal.

    Performance indices and specifications :

    • Capacity = 5,00kg per day
    • Threshing efficiency = 99%
    • Seed retention efficiency = 95%
    • Whole seed (non damage) Percentage =99%
    • Revolution per minute (R.P.M) of threshing drum = 450
    • Grain cleanliness = 85%