| 摘要 |
PURPOSE:To reduce public nuisances due to vibration by mounting a thyristor circuit supplying the AC power of predetermined frequency, voltage and AC wave-form to an electromagnet incorporated into a driving section obtaining reciprocative vibration by electromagnetic force and changing frequency, amplitude and a vibrating wave-form. CONSTITUTION:The electromagnet 1 is excited by a coil 2 connected to the DC output of a power circuit, and a strong magnetic field is generated at the end section 3. The coil 8 of the electromagnet 5 is connected to the output of the variable voltage, variable frequency and variable voltage wave-form of the power circuit, and a magnetic field corresponding to voltage, frequency and the voltage wave-form set to prescribed conditions is generated at the end section 9. Sucking force or repulsive force proportional to the intensity of the magnetic field of the end section 9 is generated in a clearance between the end sections 3, 9 at that time, and the electromagnet 5 is vibrated in predetermined amplitude, frequency and vibrating wave-form in response to voltage, frequency and the voltage wave-form set to the prescribed conditions by means of the power circuit. The vibration of the electromagnet 5 is transmitted to a hydraulic chuck through a center rod 11 and a plate 12, and a fixed pile is driven. |
