Design Of A Throw-In Axial Flow Rice Thresher Fitted With Peg And Screw Threshing Mechanism

The research seeks to design a motorized rice thresher that can be manufactured by local artisans and accessed by all small-holder rice farmers. The concept of the thresher emanated from the working principles of a throw-in axial flow thresher a peg type threshing mechanism and a screw type threshing mechanism. Components of the thresher were designed and a prototype was made.The power requirement of the thresher was evaluated and validated with the power thresher standards of the Institute of Agricultural Machinery Japan which recommends an average power requirement of 3.5PS or less. The result was a rice thresher with threshing drum of diameter 400mm and length 1120mm a threshing drum shaft of diameter 36mm a shaft bearing SKF self-aligning of designation 1406 a V-belt of number B66 an SKF wedge belt pulleys of designation PHP3SPB125TB and PHP3SPB280TB and a main assembly drawing. The power requirement was 1.4PS 1.03kW for threshing long crops of length 1282mm at feed rates up to 402kghr and 1.2PS 0.88kW for threshing short crops of length 812mm at feed rates up to 429kghr.