抄録
From the experiments at rice harvesting of three row type walking grain binder, the power requirements of each part, which were measured by the improved equipment, were as follows:
(1) The relations between rice feed rate and the mean torques of each part were the same as those in wheat. The binding unit torque was linearly increased with the increase of the weight of a rice bundle, and it was independent of the feed rate.
(2) The maximum torques of each part of binder were about 2-2.5 times of respective mean torques.
(3) The rice feed rate was about 2.5 times of wheat. When the straws were upright (straw inclination angle θ was equal 90 degrees), the mean torques of pick-up unit, cutting unit and driving wheel were almost the same as those in wheat, and the torque of cutting unit and pick-up unit was smaller than that of other unit.
(4) The torque of pick-up unit, when the straws inclined backward (θ<90°), was smaller than the one when the straws inclined ahead (θ>90°), the order of magnitude of torque, when straws inclined, was as follows: (θ<90°)>(θ<90°)>(θ=90°). It was possible to reap rice straws inclined in the range of 30°<θ<150°. They almost couldn't be picked up when θ=180°, but almost could be picked up when θ=0°, though many grain losses grew.
(5) In the case of rice harvesting, the torques of conveyor and binding unit were 2.5-3 and 5-6 times of wheat, respectively, and the weight of a bundle was also larger than wheat. It was considered that these large torques were due to the feed rate, the weight of a bundle and the friction of paddy and unsuitable timing of binding unit and others. Therefore, the binding unit should be improved in future.
The total power requirement at the second gear was small and economic compared with at the first gear except that the feed rate was low.
(6) Even in the case of upright straws (θ=90°), the total power requirements, which were 2.7-5.9 PS at the first gear and 3-4.6 Ps at the second gear were nearly full load for the engine. and the binding unit power at binding reached up to 66-76% of the total power.
