Crane control method

Details Crane control method Crane control method

1986-08-11

1988-01-05

Nase, Jeffrey V.

Traversing hoists

With haul-in line

212147, 212270, B66C 1900

Patent

active

047170298

ABSTRACT:
In a control method of a crane in which a parcel suspended by a rope is laterally transported by a trolley, the accelerating time and decelerating time of the trolley are obtained on the basis of the mass of trolley, mass of suspended parcel including a suspending device, and rope length, and when the trolley is started, the accelerating force which is necessary to allow the velocity of trolley to become an objective velocity for the accelerating time is instructed, and after this accelerating time has elapsed, the trolley is allowed to uniformly run at the objective velocity. During the constant speed running, the stop position of the trolley is predicted on the basis of the decelerating time. When the trolley reaches the start position of the decelerating operation such that the trolley can be stopped at the objective position, the decelerating force which is necessary to reduce the trolley velocity to zero for the decelerating time is instructed.

REFERENCES:
patent: 3517830 (1970-06-01), Virkkala
patent: 3921818 (1975-11-01), Yamagishi
patent: 4512711 (1985-04-01), Ling et al.
patent: 4603783 (1986-08-01), Tax et al.

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