Kinematics of Rice Transplanter (I)

Driving torque and Contact pressure of float

Abstract

This report is to examine the locomotive characteristics of a float type rice transplanter. The main results obtained are the followings;
(1) The driving torque of the float type rice transplanter can be obtained theoretically by equation (11). If the acceleration and the handling force are negligible, it can be obtained theoretically by equation (12).
(2) The distribution of the contact pressure of the float can be measured by plugging the subminiature pressure sensors in the bottom plate of the float (Fig. 2). The measured results are in Fig. 4 and 5.
(3) The driving torque which the float type rice transplanter needs for its locomotion in the puddling field was measured. The torque at 100% slippage as at turning was also measured (Table 1).
(4) The carried load by the float amounted to 50-65% of the total weight. This load, however, may be varied depending on the size of the float, the condition of the paddled field and so forth.
(5) The coefficient of sliding resistance of the float was measured in the puddled field. The measured value was in the range of 0.15-0.42. The coefficient of rolling resistance of the wheels was also obtained as follows;
diameter of the wheel 560mm; 0.30-0.62
diameter of the wheel 460mm; 0.32-0.68