Construction and evaluation of a modified multicrop thresher model irr1-pak

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dc.contributor.authorKilasara,Wenceslaus George
dc.date.accessioned2025-10-02T09:22:23Z
dc.date.available2025-10-02T09:22:23Z
dc.date.issued1987
dc.descriptionDissertation
dc.description.abstractABSTRACT A modified IRRI-PAK Multicrop Axial-flow thresher has been manufactured at the International Rice Research Institute (1RRI), Engineering workshop, based on the blueprints of the IRRI-PAK-30 Multicrop Axial-flow Thresher from Pakistan.The modifications include, a piece of hollow shaft to the threshing cylinder shaft; bolted thresher stands; increased area of one of the cleaning screens, and omission of locks and hinges on the observation windows. Different models of four-wheel tractors were used.Three of the four crops used — sorghum variety casor 2; paddy varieties IR38, IR58 and 1917; and yellow corn were obtained from IRRI experimental plots. Wheat was found in Ilocos Region - Northern part of the Philippines.Settings which included increasing/decreasing aspirator air vents, varying the slope/pitch of the oscillating tray assembly, and varying the cylinder speed/peripheral velocity were the variables for the experiments conducted.A conveyor was used during sorghum threshing,An output of 1594 kgh 1 with 97.65% cleaning efficiency, 98.47% threshing efficiency, 1.27% grain loss were recorded.The paddy threshed, gave an output range of UJ7kgh”1■l,r"'r'’-“1 with cleaning efficiency of 93.39% 1569 kgh to 96.01%, and a threshing efficiency of above 99% and total grain loss of between 1.27% and 2.01%.The output of wheat varied from 790kghT1to 2110kgh cleaning efficiency of 76.60% to 96.57%. with Threshing efficiency increased with increased speed. The speed of 510rpm [17.81ms 1 ] gave 96.12% and 710rpm [24.79ms 1 ] gave 98.14%.The results for corn threshing were influenced by the concave bar clearance and or the design of the louvres which resulted to high grain losses from straw thrower (15.94% to 16.98%). The output ranged from 862 kgh -1 to 896 ,._^-lkgh with cleaning efficiency of 85.79% to 86.66% and threshing efficiency of above 99%.
dc.identifier.urihttps://www.suaire.sua.ac.tz/handle/123456789/7068
dc.language.isoen
dc.publisherSokoine University of Agriculture
dc.subjectThresher sittings
dc.titleConstruction and evaluation of a modified multicrop thresher model irr1-pak
dc.typeThesis

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