Load-sensing active hydraulic control device
    6.
    发明公开
    Load-sensing active hydraulic control device 失效
    Lastdruckkompensierte hydraulische Steuereinrichtung。

    公开(公告)号:EP0684387A2

    公开(公告)日:1995-11-29

    申请号:EP95202286.1

    申请日:1992-12-23

    IPC分类号: F15B11/05

    摘要: A load-sensing active hydraulic control device is disclosed in which a plurality of cylinders (19,20) are connected in parallel and fed with hydraulic fluid from a variable discharge pump (1), thereby to control the variable discharge pump depending on horsepower constant control characteristics and which is capable of preventing, when one cylinder (20) is increased in load pressure, actuation of the other cylinder (19) from being stopped due to a decrease in the amount of hydraulic fluid discharged from the pump. A pilot valve (25) is provided which is changed over by a pressure actuation of a passage (18) of the one cylinder (20). The pilot valve is open to communicate a pilot chamber (4b) of a change-over valve (4) with a tank (T) when a pressure in the passage approaches a set pressure of an overload relief valve (22) of the passage. This results in a degree of opening of a variable orifice (6) of the change-over valve being reduced to decrease the amount of hydraulic fluid fed to the cylinder (20), thereby to ensure feeding of hydraulic fluid to the cylinder (19) correspondingly.

    摘要翻译: 公开了一种负载感测有源液压控制装置,其中多个气缸(19,20)并联连接并且从可变排放泵(1)供给液压流体,从而根据马力常数来控制可变排放泵 控制特性,并且能够防止当一个气缸(20)的负载压力增加时,另一气缸(19)的动作由于从泵排出的液压流体的量的减少而停止。 提供了先导阀(25),其通过一个气缸(20)的通道(18)的压力驱动而转换。 当通道中的压力接近通道的过载溢流阀(22)的设定压力时,先导阀打开以使转换阀(4)的先导室(4b)与罐(T)连通。 这导致转换阀的可变孔口(6)的开度减小,以减少供给到气缸(20)的液压流体的量,从而确保将液压流体供给到气缸(19) 相应地。