Abstract
Two soybean threshing devices were developed and tested. The general principle of operation was to impart impact energy to the pods to thresh the beans from standing uncut plants. Two configurations of nylon chords assembled on rotating shafts threshed over 95% of the beans and removed between 34 and 43% of the material other than grain (MOG). A particle blasting device, throwing two types of plastic grit of 0.047 and 0.018 g mass/grit, and soybean seeds of 0.15 g mass/seed with a high speed stream of air, threshed 97, 88, and 95% of the pods, respectively. They also removed 2.0, 1.1, and 0.25% of the MOG and detached 4.6, 3.1, and 0.65% of the pods from the stems when compared to the total pods attached to stems, respectively. Blasting the pods with the heavier plastic grits versus the lighter grits resulted in 0.18 versus 0.98% broken seed contents.
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