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    • 63. 发明公开
    • Hydraulic control circuit for operating a split actuator mechanical mechanism
    • 液压控制回路用于操作分体执行器机械机构
    • EP1338802A3
    • 2003-10-15
    • EP03250939.0
    • 2003-02-15
    • Husco International, Inc.
    • Pfaff, Joseph L.Stephenson, Dwight B.
    • F15B11/05
    • F15B11/22F15B11/006F15B11/042F15B11/044F15B21/08F15B2211/20546F15B2211/30575F15B2211/3111F15B2211/3144F15B2211/31588F15B2211/329F15B2211/351F15B2211/353F15B2211/45F15B2211/6309F15B2211/6313F15B2211/6355F15B2211/6652F15B2211/6654F15B2211/7056F15B2211/7128
    • A system for simultaneously operating first and second hydraulic cylinders (14,16) has an inlet node for connection to a source of pressurized fluid (12) and an outlet node for connection to a tank (19). A two-position, three-way primary control valve (22) has a first port connected to the inlet node, a second port connected to the outlet node, and a common port. A first electrohydraulic proportional valve (32) connects the common port to a first port of the first cylinder (14), and a second electrohydraulic proportional valve (36) connects the common port to a first port of the second cylinder (16). A third electrohydraulic proportional valve (42) connects the inlet node to a second port of the first cylinder (14) and a second port of the second cylinder (16). A fourth electrohydraulic proportional valve (44) connects the tank (19) to a second port of the first cylinder (14) and to a second port of the second cylinder (16). Selectively operating the primary control valve and one of the third and fourth electrohydraulic proportional valves determines the direction in which the first and second cylinders move. Operation of the first and second electrohydraulic proportional valves meters hydraulic fluid to or from the first and second cylinders to control the rate of that movement.
    • 用于同时操作第一和第二液压缸(14,16)的系统具有用于连接到加压流体源(12)的入口节点和用于连接到箱(19)的出口节点。 两位三通主控制阀(22)具有连接到入口节点的第一端口,连接到出口节点的第二端口和公共端口。 第一电动液压比例阀(32)将公共端口连接到第一气缸(14)的第一端口,并且第二电动液压比例阀(36)将公共端口连接到第二气缸(16)的第一端口。 第三电动液压比例阀(42)将入口节点连接到第一气缸(14)的第二端口和第二气缸(16)的第二端口。 第四电动液压比例阀(44)将罐(19)连接到第一气缸(14)的第二端口和第二气缸(16)的第二端口。 选择性地操作主控制阀和第三和第四电动液压比例阀中的一个确定第一和第二气缸移动的方向。 第一和第二电动液压比例阀的操作对第一和第二汽缸的液压流体进行计量以控制该运动的速率。
    • 67. 发明授权
    • QUICK DROP VALVE
    • 快速下落阀
    • EP0500730B1
    • 1994-06-15
    • EP90917335.3
    • 1990-10-15
    • CATERPILLAR INC.
    • SMITH, David, P.
    • F15B11/08F15B13/02
    • F15B11/024F15B2011/0243F15B2211/30525F15B2211/3058F15B2211/3111F15B2211/3144F15B2211/31576F15B2211/329F15B2211/7107F15B2211/7128F15B2211/75Y10T137/2594
    • Quick drop valves are usable in hydraulic circuits in which fluid is expelled from a hydraulic cylinder due to gravity force acting on a load connected to the hydraulic cylinder. The present quick drop valve (10) has a sleeve (68) carried by a valve member (42) for establishing an orifice (66) through which the fluid expelled from the hydraulic cylinder (13) passes. When the flow rate of the expelled fluid exceeds a predetermined flow rate, a differential pressure generated by the orifice (66) causes the valve member (42) to start moving toward a quick drop position. In so doing, the sleeve (68) quickly establishes a more restrictive orifice (67) to immediately generate a higher differential pressure to cause the valve member to quickly move to the quick drop position. The more restrictive orifice also causes a greater amount of the expelled fluid to be returned by the valve member to the expanding ends of the hydraulic cylinders, yet still allows sufficient flow therethrough so that the quick drop action can be stopped if so desired. The sleeve also functions similar to a check valve and moves to a position permitting substantially unrestricted fluid flow through the quick drop valve when the fluid is being directed to the hydraulic cylinder to raise the load. An actuating chamber (61) is defined in the valve member (42) and is subjected to pressurized fluid generated in the circuit to hold the valve member (42) in a blocking position when the blade is forced into the ground.
    • 快速下降阀可用于液压回路中,由于作用在与液压缸连接的负载上的重力,流体从液压缸排出。 本快速下降阀(10)具有由阀构件(42)承载的用于建立从液压缸(13)排出的流体通过的孔口(66)的套筒(68)。 当排出流体的流量超过预定流量时,由孔口(66)产生的压差使阀构件(42)开始向快速下落位置移动。 在此过程中,套筒(68)快速地形成更加限制性的孔口(67),以立即产生更高的压差,以使阀门构件快速移动到快速下降位置。 限制性较强的节流孔也导致较大量的排出流体被阀构件返回到液压缸的扩张端,但仍允许足够的流量通过,从而如果需要可以停止快速下降动作。 套筒的功能类似于止回阀,并且当流体被引导到液压缸以提升负载时,该套筒移动到允许基本不受限制的流体流过快速下降阀的位置。 致动室(61)限定在阀构件(42)中并且当叶片被迫进入地面时受到在回路中产生的加压流体以将阀构件(42)保持在阻挡位置。