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(11) | EP 0 869 096 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Suspended load swing displacement detector |
| (57) A swing displacement detector comprises a swing displacement detector 15 for detecting
relative displacement xl between a trolley 4 and a suspended load 6 in a crane suspending
the suspended load 6 by a rope 5 or the like; a crane upper structure displacement
detector 16 for detecting the displacement of a crane upper structure 1 supporting
the trolley 4 from the ground surface; and an arithmetic means 17 for receiving as
inputs the measured value xl of suspended load displacement by the swing displacement
detector 15, and the measured value x2 of crane upper structure displacement by the
crane upper structure displacement detector 16, and for correcting the measured value
xl of suspended load displacement based on the difference between the measured value
xl of suspended load displacement and the measured value x2 of crane upper structure
displacement. Thus, the vibrational component of the crane upper structure can be
eliminated from the measured value of swing of the suspended load, whereby the swing
component of the suspended load can be detected highly accurately. |