Abstract
Threshing is a significant operation in paddy cultivation, which affects quantitative and qualitative losses of grains. The axial flow paddy thresher ensures higher threshing quality by allowing crop to thresh in multiple passes. However, the retention time, over threshing and crop back feeding are some of the major issues in axial flow threshers and are mainly dependent on louvers spacing and inclination angle. Analysis of actual crop flow within the threshing unit will provide an opportunity to suggest improvementin existing axial flow paddy threshers. A magnetometer sensor (Make: Honeywell, Model: HMR 2300) based instrumentation system has been developed to analyse the crop flow path within axial flow threshing unit. A crop movement monitoring software was specially developed for instrumented system to record incident magnetic field. The developed system records incident magnetic field accurately and thus the actual crop flow path within threshing unit was easily detected. The observations revealed that the crop reappearedfor more than 2 – 4 times at the feed entrance after completion of one drum revolution, which leads to over threshing.
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