PROBLEM TO BE SOLVED: To provide an extension/contraction control device for a boom with a simple structure in which a height position of a hook block is maintained substantially constant when a boom is extended even when the winding number of a wire rope is changed.SOLUTION: A boom extension/contraction device 50 includes a winding number input device 35 into which the winding number n of a wire rope 34 wound on a hook block 40 is input and a drive control device 33 controlling to vary the speed of extending/contracting a telescopic boom 21 in accordance with the operation amount input into a boom telescopic operation lever 30 into which an operation for extending/contracting the telescopic boom 21 is input. The drive control device 33 controls a boom telescopic cylinder such that the extension speed of the telescopic boom 21 becomes equal to or less than a limit value when an extension speed of the telescopic boom 21 according to the operation amount of the boom telescopic operation lever 30 exceeds the speed of the limit value obtained by dividing a delivery speed of the wire rope 34 according to the operation amount of a winch operation lever 32 by the winding number n.SELECTED DRAWING: Figure 2
【課題】ブームの伸縮制御装置において、簡単な構成で、ワイヤロープの掛け数が変っても、ブームの伸長の際に、フックブロックの高さ位置が略一定にする。【解決手段】ブーム伸縮装置50は、フックブロック40への、ワイヤロープ34の掛け数nが入力される掛け数入力装置35と、伸縮ブーム21を伸縮させる操作が入力されるブーム伸縮操作レバー30に入力された操作量に応じて伸縮ブーム21を伸縮させる速度を変化させるように制御する駆動制御装置33と、を備え、駆動制御装置33は、ブーム伸縮操作レバー30への操作量に応じた伸縮ブーム21の伸長速度が、ウインチ操作レバー32への操作量に応じたワイヤロープ34の繰出速度を掛け数nで除して得られた制限値の速度を上回ったときは、伸縮ブーム21の伸長速度を制限値以下となるようにブーム伸縮シリンダを制御する。【選択図】図2
EXPANSION/CONTRACTION CONTROL DEVICE FOR BOOM
ブームの伸縮制御装置
2018-06-28
Patent
Electronic Resource
Japanese
IPC: | B66C Krane , CRANES |
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