PROBLEM TO BE SOLVED: To provide a boom attaching/detaching structure in which a boom foot pin can be easily pulled out when taking out a boom from a revolving super structure, and the vertical movement of a base end part of the boom suspended by a crane can be suppressed.SOLUTION: In a boom attaching/detaching structure BD, a telescopic boom is attached to a revolving super structure by inserting a boom foot pin into insertion holes 38a1, 38b1 of boom foot 38a, 38b and an insertion hole 14a of an attachment bracket 14R, and the telescopic boom is taken out from the revolving super structure by pulling out the boom foot pin from these insertion holes. A hydraulic cylinder 70R capable of extending or contracting the tip of a cylinder rod 72 in a vertical direction is attached to the attachment bracket 14R. In a state of aligning the position of each insertion hole, a downward block 80 attached to the lower side of the boom foot 38b and an upward block 73 attached to the tip of the cylinder rod 72 are provided so as to engage with each other.

    【課題】ブームを上部旋回体から取り外す場合に、ブームフートピンを容易に抜き取ることができ、クレーンで吊り上げるブームの基端部の上下動を抑制することができるブーム脱着構造を提供すること。【解決手段】ブーム脱着構造BDでは、ブームフート38a,38bの挿通孔38a1,38b1及び取付ブラケット14Rの挿通孔14aに、ブームフートピン14Rを挿通することで、伸縮ブームが上部旋回体に取付けられ、これら挿通孔からブームフートピン14Rを抜き取ることで伸縮ブームが上部旋回体から取り外される。取付ブラケット14Rには、シリンダロッド72の先端部を上下方向に伸縮可能な油圧シリンダ70Rが取付けられている。各挿通孔の位置が合う状態で、ブームフート38bの下側に取付けられている下向ブロック80と、シリンダロッド72の先端部に取付けられている上向ブロック73とが係合するように設けられている。【選択図】図4


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    Title :

    BOOM ATTACHING/DETACHING STRUCTURE


    Additional title:

    ブーム脱着構造


    Contributors:

    Publication date :

    2015-07-06


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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