Traversing hoists – Having means to prevent or dampen load oscillations – Antisway
Patent
1997-10-09
2000-10-24
Hess, Douglas
Traversing hoists
Having means to prevent or dampen load oscillations
Antisway
212272, B66C 1306, B66C 1316
Patent
active
061353019
ABSTRACT:
A transverse trolley (11) is transversally movable on a crane girder. A driver is provided for the transverse trolley (11). A pair of sheave blocks (14, 15) which is movable relative to a transverse trolley (11) are disposed on both (right and left) sides of a transverse trolley (11). Drivers are provided for the sheave blocks. Detectors (31 through 38) are provided which detect the displacement and velocity of the transverse trolley (11), the sway displacement and velocity of a hoisted load-piece (23) on both (right and left) sides and the displacement and velocity of the two sheave blocks (14, 15). A notch is disposed on an operation controlling panel of the transverse trolley (11) for setting a trolley transverse velocity by an operator. A transverse notch-driving control quantity detector (40) is provided which outputs signals indicative of notch-driving control quantity (a trolley transverse velocity set value) which is set by operating the notch. A controller is provided which effects sway-damping control of the load-piece hoisting device based on detection signals obtained from the detectors (31 through 38 and 40) and an optimizing control unit performs sway-damping control with optimal controlling quantities on the basis of a preset optimal gain K in accordance with the displacement and velocity and the notch-driving control quantity.
REFERENCES:
patent: 3921818 (1975-11-01), Yamagishi
patent: 4905848 (1990-03-01), Skjonberg
patent: 5127533 (1992-07-01), Virkkunen
patent: 5526946 (1996-06-01), Overton
patent: 5529193 (1996-06-01), Hytonen
patent: 5642822 (1997-07-01), Monzen et al.
patent: 5790407 (1998-08-01), Strickland et al.
patent: 5819962 (1998-10-01), Okubo et al.
Kouno Susumu
Miyata Noriaki
Monzen Tadaaki
Okubo Yoshiaki
Toyohara Takashi
Hess Douglas
Johnson R. B.
Mitsubishi Jukogyo Kabushiki Kaisha
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