HYDRAULIC SHOVEL WITH CRANE FUNCTION: Fid-Bau Portal

HYDRAULIC SHOVEL WITH CRANE FUNCTION

YONEKURA KIYOSHI

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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