Pilot pump bleed control for earthmoving scrapers
    3.
    发明授权
    Pilot pump bleed control for earthmoving scrapers 失效
    用于接地刮刀的引导泵排放控制

    公开(公告)号:US3862643A

    公开(公告)日:1975-01-28

    申请号:US33591073

    申请日:1973-02-26

    Abstract: In an earthmoving scraper a low volume, low pressure, pilot pump supplies fluid pressure to a pilot control valve which routes this fluid through bleed lines to a remote scraper control valve that operates the bowl jacks on the scraper from a separate source of pressurized hydraulic fluid. By manually varying the bleed rates of the output of the pilot pump with the spool of the pilot valve, proportion actuation of the control valve can be obtained through differential pressures in the bleed lines connecting it to the pilot valve. A safety valve connected in the bowl carry circuit supplies an alternate source of fluid pressure to the pilot valve if the pilot pump fails, ensuring positive fail-safe operation of the system.

    Abstract translation: 在一个移土刮板中,低体积,低压的先导泵向先导控制阀提供流体压力,该先导控制阀通过排放管线将该流体引导到远程刮板控制阀,该远程刮刀控制阀从单独的加压液压流体源操作刮板上的碗形插口 。 通过用先导阀的阀芯手动改变先导泵的输出的排出速率,可以通过将其连接到先导阀的排放管中的差压来获得控制阀的比例致动。 如果先导泵发生故障,连接在碗托式回路中的安全阀向先导阀提供备用的流体压力源,确保系统正常的故障安全操作。

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