Studies on the Seedbed Making Tillage by Rotary Tiller (I)

General Properties of using Plate Shield

Abstract

When tilling is done, not only the rough-tilling, but having in mind all or a part of the procedure satisfying the condition as a seedbed, the author defines it as the seedbed making tillage. The results of test on the characteristics of rotary tillage using are as follows:
1) Restricting the initially tilled soil within the revolving locus circle of the tillage tine by the action of shield, thereby giving multi-tillage tine action to the soil, it was recognized that the pulverizing effect, stub-cutting performance, and ground leveling were improved.
2) In this experiment, the amount of the restricted soil was controlled by shield angle α measured from the plane normal to the direction of travel. As α was decreased, the soil clods became fine as a whole, the stubs were chopped to pieces, and the degree of the surface leveling became very high.
3) The average weight diameter (D_w-2) of the best soil pulverizing in the practical region was 18.8mm. In this case it was shown that D_w-1/D_w-2=2.4, P_sn/P_so=2.6, and compared with the soil pulverizing done by making the pitch of thee ordinary rotary tiller small, the pulverizing efficiency was extremely higher.
4) The relation between soil pulverizing resistance P_k and pulverized soil diameter D_wo=D_w-1-D_w-2 is P_k=a. D_woⁿ, and the relation between specific resistance of soil pulverizing K and tilling pitch P_i is K=a.P_i^-n.
5) The larger the initial average weight diameter D_w-1, the easier the pulverizing and the more amount of the pulverized soil. Generally, from the neighborhood of D_w-2 is 20mm, K begins to increase suddenly.
6) The tilling performance was similar to that of the common rotary tilling, but substantially both the rotor horsepower and wheel axle horsepower became larger.