OSCILLATION CONTROL METHOD IN CEILING CRANE

• Main Author: ARAI RYOICHI
• Format: Patent
• Language: English
• Published: 11.03.1991
• Subjects: CRANES; HAULING; HOISTING; LIFTING; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS,WINCHES, OR TACKLES; PERFORMING OPERATIONS; TRANSPORTING

PURPOSE:To perform bracing positively by stopping a crane in a position slightly more to the front by the specified quantity than the target position so as to provide the crane with correcting distance and suppresing the residual oscillation within this correcting distance. CONSTITUTION:When the length of a rope 5b and the weight of a lifted load are detected, a reference pattern generating device 1 generates a reference pattern formed of such a speed pattern that oscillation generated by the acceleration/deceleration of a crane 5 at the time of being moved by the specified distance becomes zero at the stop time of the crane 5, and the oscillation of the lifted load 5c at the time of the acceleration/deceleration including the stoppage of the crane 5 being zero is detected at a detecting device 2a. A correction pattern generating device 2a generates a correction pattern formed of such a speed pattern as to make this detected oscillation zero, and the correction pattern is added to the reference pattern at the combining device 3, thus stopping oscillation of the lifted load 5c. The crane 5 is stopped once in a position more to the front by the specified quantity than the target stop position and then subjected to the suppression of residual oscillation as well as positioning.