Study on the Plowing Capacity of the 4 wheel tractor (IX)

On the Efficiency of Rotary Tilling Operation

Abstract

There are four kinds of method, of rotary tilling, i. e. Succesible plowing method, Alternated plowing method, Cycloidal plowing method and Rotational plowing method, as shown in Fig. 1, and five kinds of method of tilling the headland, i. e., Over-line turning method, Additioval plowing method (for A line), Additional plowing method (for B line), Combinative plowing method and Semi-followed plowing method, as shown in Fig. 2, which are the same methods as two-way plow's
The formulas of the futile running distance that are calculated by combining these method are as follow:
(1) Σ S+0=S⋅B/b
(2) ΣS+2l⋅B/b=(S+2l)⋅B/b
(3) ΣS+(S+2l)⋅2l/b+A=S⋅B/b+(S+2l)⋅2l/b+A
(4) ΣS+B⋅2l/b+A=(S+2l)⋅B/b+A
(5) ΣS+(l+πr/2)4l/b=1/b{(π+4)(B-2l)r+2l(2l+πr)}
provided that {S=U in Cycloidal plowing method S=E in Rotational plowing method
But when calculating the practical working efficiency, It is necessary to add the distances converted the time lossles which occur at gear change, and the variation of speed which occures at revesse.
These formulas are shown in Tab. 1 and the specifications of the tractors used in the test are shown in Tab. 2. The efficiency curve of the each plowing method, When the area of the field is (20m)²-(100m)². are shown in Fig. 3. From these results, altornated plowing method in the main area and Over-line turning method in the outside area indicate the highest efficiency respectively. Additional plowing method (for B line) and Combinative plowing mathod indicate the less efficiency than the former. Additional method (for A line) and Cycloidal method indicate comparatively low efficiency, but their efficiency may elevate a little if B line is divided suitably.
The relation of plowing method and the area in order to have 80% of efficiency is shown in Tab. 4.
The efficiency curves, generally tend to increase with the increase of the area, and this tendency is the most remarkable in Additional method (for B line).
Considering the the slenderness rate of the field, the efficiencies of the three kinds of tractor increase with this rate as shown in Fig. 4.