Control device for automatically stopping swiveling of cranes
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United States of America Patent
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Oct 20, 1998
Grant Date -
N/A
app pub date -
Mar 11, 1996
filing date -
Sep 9, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device which comprises first calculating means for calculating a lower-limit time Tmin of swiveling control on the basis of dynamic characteristics of a swiveling angular velocity control system, second calculating means for determining a swinging period T of the suspended load, third calculating means for selecting a smallest natural number n for which nT.gtoreq.Tmin, and braking and stopping control means for braking and stopping the rotary body with an angular acceleration .alpha. indicated by the equation .alpha.=-.OMEGA.O/nT (where .OMEGA.O is the swiveling angular velocity of the rotary body immediately prior to the initiation of automatic swiveling stopping control), and which eliminates influences of elastic vibrations so as to insure an excellent stopping accuracy.
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