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    • 2. 发明申请
    • 荷台の上下揺動用油圧駆動装置
    • 液压驱动装置,用于垂直运动装载运动平台
    • WO2007026734A1
    • 2007-03-08
    • PCT/JP2006/317051
    • 2006-08-30
    • 日立建機株式会社金子 智安田 知彦柳生 隆田中 康雄伏木 道生
    • 金子 智安田 知彦柳生 隆田中 康雄伏木 道生
    • B60P1/04F15B11/028F15B11/04F15B11/08
    • F15B11/028B60P1/162F15B2211/20523F15B2211/20538F15B2211/3116F15B2211/329F15B2211/7053
    • [PROBLEMS] To simplify switching control of a directional control valve and to simplify the structure of a directional control valve for controlling operation of a hoist cylinder. [MEANS FOR SOLVING PROBLEMS] In a hydraulic drive device for vertical pivoting movement of a load carrying platform, a first directional control valve (10) has only three switchover positions that are a neutral position (10A) relating to operation of stopping and holding a load carrying platform, a switching position (10B) relating to operation of lifting the load carrying platform, and a switchover position (10C) relating to operation of forced lowering of the load carrying platform. Further, in the device, also a second directional control valve (12) has only three switchover positions that are a neutral position (12A) relating to operation of stopping and holding a load carrying platform, a switching position (12B) relating to operation of lifting the load carrying platform, and a switchover position (12C) relating to operation of allowing the load carrying platform to fall by its own weight. The device has a first on-off valve (13), a second on-off valve (14), and a third on-off valve (15) that are proportional control solenoid valves for switching an appropriate one of the first directional control valve (10) and the second directional control valve (12).
    • [问题]为了简化方向控制阀的切换控制,并且简化用于控制起重缸的操作的方向控制阀的结构。 解决问题的手段在用于承载平台的垂直摆动的液压驱动装置中,第一方向控制阀(10)仅具有三个切换位置,这些切换位置是与停止和保持的操作有关的中立位置(10A) 承载平台,与起重承载平台的操作有关的切换位置(10B)以及与承载平台的强制降低的操作有关的切换位置(10C)。 此外,在该装置中,第二方向控制阀(12)也只有三个切换位置,它们是与停止和保持负载平台的操作相关的中立位置(12A),与操作相关的切换位置(12B) 提升承载平台,以及与允许承载平台自身落下的操作有关的切换位置(12C)。 该装置具有第一开关阀(13),第二开关阀(14)和第三开关阀(15),第三开关阀(15)是比例控制电磁阀,用于切换第一方向控制阀 (10)和第二方向控制阀(12)。