Abstract
A cone type thresher is constructed of a conical cylinder (inner cone) and a conical concave (outer cone). Research described in this paper was conducted to investigate the threshing efficiency of rice, separating efficiency, threshing loss, cleaning efficiency, damage of rice and rice threshing power requirement of the cone type thresher.
The effect of inner cone speed upon the threshing efficiency is larger than that of outer cone speed and the effect of outer cone speed upon the separating efficiency is larger than that of inner cone speed.
When inner cone speed is 600 to 800rpm, outer cone speed is 200rpm and the rotating direction of both cones is same, both threshing loss and damage of rice become below 1 percent.
The feeding rate must be increased through improvement of the feeding mechanism.
