Qualitative evaluation of bean seed threshing by adapted threshing mechanism of cereal harvesting machine
1997
Ponican, J.
Design and kinematic parameters of threshing mechanism can have a significant effect on threshing quality of seed beans. In this work, an effect of circumferential velocity of threshing beater (7.8-11.77 m/s) and threshing clearance on a damage of bean seeds and bean under-grate separation is analysed. Experimental measurements were conducted on the model of adapted threshing mechanism. The adaptation was based on rubber coating of beater bars by molecular rubber UNIREP 33 as well as on using the new beater grate with plastic movable parts. Bean varieties Ultima and Kreola were chosen for threshing. Results show that when circumferential velocity is increased in the variety Ultima, damage increases from 6.4 to 21.5 %; in the variety Kreola, damage increases from 16.7 to 32.3 %. When the threshing clearance is widened, damage of seeds decreases, and more significantly decreases at a higher circumferential velocity of the beater drum. Of the given varieties, Ultima is less susceptible to damage. When evaluating the under-grate separation, a separation capability of beater grate in the variety Ultima increases ranging from 31.7 to 54.6 % and in the variety Kreola from 36.2 to 52.1 %. While the threshing clearance being widened, the under-grate separation is slightly decreased. Results indicate that the adapted model of threshing mechanism is more suitable in terms of bean seed damage and bean under-grate separation than the non-adapted version
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