Circuit for controlling a double-action hydraulic drive cylinder
    1.
    发明授权
    Circuit for controlling a double-action hydraulic drive cylinder 失效
    用于控制双作用液压驱动气缸的电路

    公开(公告)号:US07752842B2

    公开(公告)日:2010-07-13

    申请号:US11988908

    申请日:2006-01-27

    IPC分类号: F15B11/044 F15B11/024

    摘要: Circuit for controlling a double-action hydraulic drive cylinder includes a directional control valve having working ports A and B, a pump port P, and a tank port T, wherein the directional control valve has a neutral position in which pump port P is blocked and working ports A, B are connected to tank port T. A pressure-limiting valve and a controllable load-holding valve are connected to the piston space in parallel, and a regeneration check valve is connected in series between a connection point for the parallel components and the rod space. A first precharge valve is connected between the working port A and the connection point, and a first bypass check valve is connected anti-parallel parallel with the first precharge valve and the load-holding valve. A second precharge valve is connected in series with the directional control valve between the tank port P and the rod space.

    摘要翻译: 用于控制双作用液压驱动气缸的电路包括具有工作端口A和B的方向控制阀,泵口P和罐口T,其中方向控制阀具有中止位置,泵端口P被阻塞, 工作端口A,B连接到油箱端口T.压力限制阀和可控制的负载保持阀并联连接到活塞空间,再生止回阀串联连接在并联部件的连接点 和杆空间。 第一预充阀连接在工作端口A和连接点之间,第一旁通止回阀与第一预充阀和负载保持阀并联反并联。 第二预充阀与罐口P和杆空间之间的方向控制阀串联连接。

    Load-holding brake valve
    3.
    发明授权
    Load-holding brake valve 有权
    承重制动阀

    公开(公告)号:US6098647A

    公开(公告)日:2000-08-08

    申请号:US125977

    申请日:1998-08-28

    CPC分类号: F15B13/015 F15B2013/008

    摘要: A hydraulically controllable valve for double-acting consumers that in the lowering mode drains off a flow of load volume from connection B to connection A in throttled fashion. To that end, the valve has a valve seat (5), which communicates with a sealing face (4) of a main piston (3). A pilot piston (8) is guided concentrically in the main piston (3) and communicates with a sealing face (7) to a pilot valve seat (6) in the main piston; the main piston (3) and the pilot piston (8) are held on the valve seat (5) and pilot valve seat (6), respectively, by the load pressure and/or by spring force. On the pressure-relieved side, the pilot piston (8) has a piston shank (9), guided in a seat bore, with a continuously decreasing throttling action and in particular throttle grooves (10), which form a throttle restriction. On hydraulic triggering, the pilot piston (8) is axially displaceable by means of an opening piston (20), so that the pilot valve (5, 6) opens, and a load volume flow flows out of a pilot chamber (15), receiving the springs, via the throttle restriction. The resultant load pressure reduction causes an axial displacement of the main piston (3) and the opening of the valve seat. An additional damping valve assembly reduces incident vibration of the load. A pressure limiting valve, independent of the return pressure, is integrated in the load-holding brake valve housing.

    摘要翻译: PCT No.PCT / EP97 / 00992 Sec。 371日期1998年8月28日 102(e)1998年8月28日PCT PCT 1997年2月28日PCT公布。 出版物WO97 / 32136 日期1997年9月4日一种用于双作用消耗器的液压可控阀,在降低模式下,以节流的方式将负载量从连接B流向连接A. 为此,阀具有与主活塞(3)的密封面(4)连通的阀座(5)。 导向活塞(8)同心地被引导到主活塞(3)中,并与主活塞中的先导阀座(6)的密封面(7)连通。 主活塞(3)和先导活塞(8)分别通过负载压力和/或弹簧力保持在阀座(5)和先导阀座(6)上。 在减压侧,导向活塞(8)具有在座位孔内引导的具有连续降低的节流动作的活塞杆(9),特别是形成节气门限制的节流槽(10)。 在液压触发时,先导活塞(8)通过打开活塞(20)可轴向移动,使得先导阀(5,6)打开,并且负载体积流量从先导室(15)流出, 通过节气门限制接收弹簧。 所产生的负载压力下降导致主活塞(3)的轴向位移和阀座的开口。 附加的阻尼阀组件减少了负载的入射振动。 压力限制阀独立于回流压力,集成在负载保持制动阀壳体中。