| 摘要 |
A plate vibrator for compacting soil, asphalt and similar materials comprises a bottom plate on which is rigidly mounted a vibrating element driven by a power unit that is mounted resiliently on the bottom plate. The vibrating element comprises at least two counterrotating eccentric weights mounted on a shaft, the phase positions of the eccentrics being capable of adjustment in relation to each other by means of an adjusting mechanism so that the direction of the resultant of the centrifugal forces can be arbitrarily selected in relation to the bottom plate. The location of the element and power unit in relation to each other on the bottom plate and the distribution of the masses oscillating with the bottom plate are chosen to minimize structural height and maximize translational motion both forward and in reverse. In order to bring about a change in the phase position of the eccentrics in relation to each other, one or more of the eccentrics is mounted in such a manner that it can rotate in relation to the shaft, and the direction of rotation of such weights is, with the aid of a sprocket and chain transmission, opposite to that of the other weights, which are rigidly mounted on the shaft. The resultant vibrational force generated during the rotation of the shaft is thus directional. By means of the adjusting mechanism the plate can be given both a vibratory compacting motion and a forward or reverse motion along the surface that is to be compacted. |
