Method for controlling spreader in crane

Details Method for controlling spreader in crane Method for controlling spreader in crane

2008-07-01

2008-07-01

Brahan, Thomas J. (Department: 3654)

Traversing hoists

Methods

C212S274000

Reexamination Certificate

active

10515052

ABSTRACT:
The invention relates to a method for controlling swaying and swinging of a spreader in a crane and the load attached thereto, the crane comprising: a trolley, hoist gears, hoisting ropes, on which the spreader is suspended from the trolley, auxiliary gears provided with motors and motor control equipment and auxiliary ropes, and in which method the forces of the auxiliary ropes exerted on the spreader are controlled by moving the auxiliary ropes using the auxiliary gears by means of torque instructions (Tcontrol) obtained on the basis of the rope forces (Frope) of the auxiliary ropes and the rotating speed data of the auxiliary gears, and whereby the rotating speed data of each auxiliary gear is formed gear-specifically as the difference between the measured rotating speed (nact) of the auxiliary gear and the calculated rotating speed (ncalc) of the auxiliary gear.

REFERENCES:
patent: 5769250 (1998-06-01), Jussila et al.
patent: 4-303390 (1992-10-01), None
patent: 9-158254 (1997-06-01), None
patent: WO-97/08094 (1997-03-01), None
patent: WO-02/22488 (2002-03-01), None
patent: WO-02/076873 (2002-10-01), None

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