Abstract
A balanced oscillating method was used to reduce the draft force of male drainer as well as to lighten severe vibration caused by single oscillating method. With the results of the model tests, a prototype machine was designed and built to be able to oscillate two moles horizontally with same and different amplitudes, or inclined oscillation of the rear mole. The performance of the machine was tested in the field. The results are as follows:
1. The acceleration of vibration on the balanced type machine was decreased by 34.5 to 42.8% compared to that of single mole type. The amplitudes of variation in the moments of the rear shank were decreased with the increase of velocity, and the acceleration of vibration was decreased.
2. The draft force of the balanced type machine was decreased by 27.2 to 58.8% compared to that of non-oscillating machine, but increased 7 to 40% in comparison with that of the sigle oscillating one.
3. The oscillating torque was increased as the mole's amplitudes and frequencies increased, and the oscillating power became sometimes more than the draft power. The total power requirement was increased with the increase of frequency and velocity. It was observed that the total power requirement became less than that of non-oscillating operation at certain velocities and frequencies.
