PROBLEM TO BE SOLVED: To provide an automatic boom expansion device of a work machine capable of reducing burden such as fatigue of an arm and a hand of an operator who inputs an operation for expanding a boom when the operator performs expansion of the boom.SOLUTION: When an engine speed of a first predetermined engine speed R1 or more is detected by an engine speed sensor 51 with an automatic expansion switch 53 is turned on, and an operation for making a speed of expansion of a boom 22 with respect to a boom expansion lever 52 to be a predetermined speed or more is inputted, an automatic expansion movement for continuing an expansion movement of the boom 22 is performed without input of an operation for expanding the boom 22 by the boom expansion lever 52.

    【課題】作業者がブームの伸縮動作を行う際に、ブームを伸縮させる操作を入力する作業者の腕や手の疲労等の負担を軽減することのできる作業機械のブーム自動伸縮装置を提供する。【解決手段】自動伸縮スイッチ53がオンの状態で、エンジン回転数センサ51によって第1所定回転数R1以上のエンジンの回転数が検出され、ブーム伸縮レバー52に対してブーム22の伸縮動作の速度を所定速度以上とする操作が入力されると、ブーム伸縮レバー52によるブーム22を伸縮する操作を入力しない状態で、ブーム22の伸縮動作を継続する自動伸縮動作を行う。【選択図】図4


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    Title :

    AUTOMATIC BOOM EXPANSION DEVICE OF WORK MACHINE


    Additional title:

    作業機械のブーム自動伸縮装置


    Contributors:

    Publication date :

    2015-12-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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