To provide a hydraulic shovel with a crane function improved in operational stability.SOLUTION: A hydraulic shovel is provide with: a confluence change-over valve 54 merging pressure oil from a second hydraulic pump 52 in an oil passage between a first hydraulic pump 51 and a boom direction change valve 55a; a first electromagnetic valve 59a switchable between a communication state communicating with a confluence pilot oil passage 56c in accordance with boom lifting operation and a cut-off state cutting off the confluence pilot oil passage 56c. An ECU 60 brings the first electromagnetic valve 59a into a communication state in an excavation operation mode and the first electromagnetic valve 59a into the cut-off state in a crane operation mode.SELECTED DRAWING: Figure 2

    【課題】操作の安定性を向上させたクレーン機能付き油圧ショベルを提供する。【解決手段】第1油圧ポンプ51とブーム用方向切換弁55aとの間の油路に第2油圧ポンプ52からの圧油を合流させる合流切換弁54、ブーム上げ操作に応じて合流パイロット油路56cを連通させる連通状態と合流パイロット油路56cを遮断する遮断状態とに切換可能な第1電磁弁59aを備え、ECU60は、掘削作業モードでは第1電磁弁59aを連通状態とし、クレーン作業モードでは第1電磁弁59aを遮断状態とする。【選択図】図2


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    Title :

    HYDRAULIC SHOVEL WITH CRANE FUNCTION


    Additional title:

    クレーン機能付き油圧ショベル


    Contributors:

    Publication date :

    2020-01-09


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    E02F Baggern , DREDGING / B66C Krane , CRANES / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



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