Abstract
The experiment was carried out to examine the number of operational procedures, required power, pulverizing property and ridge height, when the pulverizing device with a rotary tilling tine attached to a horizontal screw type blade was set and used for ridge-making operation, and the various characteristics as the one process ridge-making machine were investigated.
(1) The arrangement of the tine of the pulverizing device was made such that the tine was attached symmetrically in left and right sides in relation to the shaft center and directed inwards, so that the ridge-making effect was not reduced. When the cover (apron) for preventing scattering was attached to the rear of the pulverizing device, the pulverizing effect was somewhat improved, but the required power increased rapidly, and the operation sometimes became impossible.
(2) The required power was 6-20 PS when the tilling width of the blades was 145cm, the tilling depth was 13-18cm, and the tilling pitch was 10-20cm, and also the width and depth of action of the pulverizing device were 85-110cm and 9-42cm, respectively. As the general tendency, the power increased in proportion to the increase of the number of revolution of the ridge-making shaft (the increase of tilling pitch) and the increase of tilling depth.
(3) The form of ridges was affected by the presence of the apron, and it was triangular when the apron was not used, but it was changed to semi-cylindrical form as the top of ridges fell in when the apron was used. The ridge height changed with tilling depth, and turned out to be 30-40cm when the tilling depth was 13-18cm (without the apron). But the difference according to tilling pitch was scarcely observed.
(4) The vibration of the machine body during operation decreased linearly as the number of revolution of the ridge-making shaft increased, and the amplitude was 2.0-0.5cm at the portion of the machine body with large amplitude, thus it was found that operation can be carried out stably.
