| 摘要 |
<p>Device in which the various movements, in particular angular and telescopic movements, are executed with the aid of thrust jacks supplied with hydraulic fluids via mechanically or electrically controlled distributors connected to the jacks by flexible pipes, this device being characterised in that on each distributing element controlling a movement of the crane, there is provided a volumetric flow sensor so that the amount of hydraulic fluid supplied to the corresponding jack may be known moment by moment, and in consequence the angular position of the articulated arm relative to that on which the jack is bearing may be determined.</p> |
