自脱型コンバインの機能に関する研究 (第2報)

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書誌事項

タイトル別名
  • Fumctional Studies of the Small Combine with Self-feeding Type Thresher (part 2)
  • ジダツガタ コンバイン ノ キノウ ニ カンスル ケンキュウ 2 ジドウ ダッコクキ ノ カクブ トルク ノ ドウトクセイ
  • The Dynamic Characteristics of Fluctuating Torques of the Functional Elements of the Thresher
  • 自動脱穀機の各部トルクの動特性

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抄録

Power requirements of the self-feeding type thresher were measured in order to findt he functions of the small rice combine with self-feeding type thresher.<br>In this paper, the characteristics of the fluctuating torques at each element of the thresher were discussed by means of the power spectral density and the moving average analysis.<br>1) The maximum value of the threshing cylinder torque of the self-feeding thresher was 1.5-2.0 times of its mode, and the cylinder torque of the self-feeding thresher did not fluctuate so heavily as the cylinder torque of the large combine.<br>2) As the result of the power spectral analysis, the distinguished frequency of the fluctuating torque of the threshing cylinder was about 5.5Hz and those of the others about 20Hz, independently of load, respectively. These fluctuations of the torques seemed to be the peculiar ones of the tested thresher.<br>3) By filtering the above mentioned fluctuations by means of the moving average method from the original oscillograms recorded for feeding one binded sheaf, the transient fluctuations of the torque at the beginning of threshing was discussed, and the tollowing results were obtained.<br>a) The threshing torque reached the maximumm value when a binded sheaf was conveyed with a feed chain to a portion of 1/4-3/4 of the cylinder length. This shows that the threshing action is almost finished between this portion and the panicle is spreaded and threshed gradually.<br>b) The maximum values for dried rice were about 1.5kg-m and continued for 0.65 sec, that for green rice about 2.0kg-m and 0.95sec. This shows that it is more difficult to thresh green rice than dried.<br>c) After these maximum values, the torque of the cylinder decreased to 1kg-m for dried rice and 1.6kg-m for green, and these values had continued untill the sheaf was transported to the end of the cylinder.<br>d) The torques of the sub-threshing cylinder, fans and screw conveyor shafts did not almost fluctuate.

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