| 摘要 |
The apparatus comprises a vibrator and a device for anchoring the vibrator to surface of tank wall in such a manner that the bond between the surface-anchoring device and the tank wall surface is releasable. The surface-anchoring device includes either an electromagnet or a permanent magnet, or a vacuum cup. Release is obtained by deenergizing the electromagnet, or by releasing the vacuum. Cams mounted adjacent the permanent magnet bear against the tank wall and force the pole pieces away from the tank wall to release the magnetic bond. The tank wall vibrates over a considerable area and the vibrations are transmitted to the insulation material to settle same. A rope supports the apparatus when the surface bond is released so that it can be shifted to a different wall portion.
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