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ABSTRACT
Rice deshelling is a part of the entire milling process which involves the removal of chaffs from rice paddy by applying shearing forces which detach the chaffs from the rice grains. A rice deshelling machine was designed and fabricated using locally sourced materials to meet small to medium scale rice deshelling for rural farmers. The machine which comprised of feed hopper, shutter, knurled shaft with screw, electric motor and bearings had a base length of 600mm by 200mm breadth at the top end and 400mm breadth at the lower end.
Test operations carried out with the machine after production showed that it had a throughput capacity of 1547kg/hr and mechanical efficiency of 89%. 3 test runs of rice deshelling using the machine that were conducted revealed that it took the machine an average time of 41 seconds to deshell about 18kg of rice paddy. Rice milled with thee machine were adjudged okay by physical measurement in comparison with already shelled rice.
The aim of the research which was to design and fabricate a rice deshelling machine was achieved and the objectives of developing a preliminary conceptual design, analyzing and testing of the fabricated rice deshelling machine prototype was achieved.
