Vibrator for ground compaction - with variable operational frequency obtained by varying eccentric rotation and adjusting its centre of gravity

摘要

The vibrator has an outer vibration pipe with a closed bottom end forming a point and containing an eccentric with a large striking weight above the closed end. This eccentric can be driven at a variable rate of rotation and the distance of the centre of gravity of the eccentric from its rotary shaft is also variable, eg in conjunction with the variation in its rate of rotation. Pref. the eccentric is in at least two parts, with the division between them extending perpendicular to the rotary shaft. The coupling between the two parts allows adjustment of their relative angular position. The vibrator allows the vibration frequency to be varied during operation to obtain the required compaction with the min. number of operations. The vibrator can have an electric or hydraulic drive motor.