| 摘要 |
The determination of the maximum elongation of the trolley of a tower crane takes place continuously when the jib swings over a zone which is forbidden for the load and delimited by a straight line. This takes place by measuring, by means of angular sensors, the rotation alpha of the crane with respect to an origin located at the centre O of the straight line AB and by calculating, from this angle, and from the measured then memorised value R, the distance of the crane G from the straight line AB. The value thus calculated is used to emit a signal for stopping the rotation of the jib and of the trolley. <IMAGE>
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