ロータリ・アップカット耕うん方式に関する研究 (第2報)

砕土・投てき・反転性能

抄録

The characteristics of soil breaking, soil scattering and soil turning on the up-cut method of rotary cultivation were studied, and these characteristicts including the load characteristics were considered synthetically.
It was considered that a soil breaking in the up-cut method arose from a tension mainly, these cracks were apt to grow irregularly but almost horizontally, and they were big and long so that the clods were larger than the case of a down-cut.
The influences to a soil breaking of the shape of blade and the rotor speed were almost same tendency as a down-cut method, but they were unsystematic slightly.
As a rule, the volume of scattered soil was about twice of the case of a down-cut, and its half volume flew to the front, a 10-20% of its volume flew to the rear and the remainder flew to upward, and these phenomena were influenced by the shape of blade, soil and working conditions.
The distribution of soil scattering on the ground was very broad and not concentric, and the characteristics of soil turning had almost some tendency but it was a little better than the down-cut method.
On the synthetically, it was considered that the up-cut method is convenient as the tilling method as the resistances of this method were small, and some vertical downward force was usually produced, but the existences of the tractive resistance to the rear and some soil scattering to the front are disagreeable as the tillage.
The volume of scattered soil was more than the down cut method and the phenomena of soil scattering to the front or upward are available for the many soil preparing and management works, but the shape of blade and shield, the fitting position of shield, and the working conditions must be carefully chosen.
In a word, the up-cut method will be promising as the tilling works or soil preparing and management works if shapes and the conditions are suitably chosen