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    CONTROL DEVICE FOR ZERO-LEAK DIRECTIONAL CONTROL VALVES
    2.
    发明授权
    CONTROL DEVICE FOR ZERO-LEAK DIRECTIONAL CONTROL VALVES 有权

    公开(公告)号：EP3191716B1

    公开(公告)日：2018-11-21

    申请号：EP15756469.1

    申请日：2015-07-15

    申请人： Walvoil S.p.A.

    发明人： MUSIANI, Massimiliano ,  MESTURINI, Davide

    IPC分类号： F15B11/00

    CPC分类号： F15B11/16 ,  E02F3/325 ,  E02F9/2267 ,  E02F9/2271 ,  F15B11/003 ,  F15B13/01 ,  F15B2211/30515 ,  F15B2211/329 ,  F15B2211/355 ,  F15B2211/6355

    摘要： Hydraulic system, distributor and bidirectional valve to activate the hydraulic actuators (3; 3a, 3b) of an operating machine; the hydraulic system (1) having: a first high-pressure oil delivery (4); an oil drain (8); a slide valve with a spool, which is axially sliding and is suited to control a hydraulic actuator (3); a second low-pressure oil delivery (6); an activation valve (15); and a bidirectional valve (21) with a first passage opening (22) that can be hydraulically connected, by the slide valve (9) to the first delivery (4) and a second passage opening (23) hydraulically connected to the actuator (3); wherein, the bidirectional valve has an inlet opening (24) that can be connected, by the activation valve (15) to the second delivery (6) and an outlet opening (25) that can be connected, by the spool (12) to the drain (8).

    Hydraulic circuit for construction equipment
    3.
    发明授权
    Hydraulic circuit for construction equipment 有权

    公开(公告)号：EP1975324B1

    公开(公告)日：2018-10-24

    申请号：EP08005418.2

    申请日：2008-03-22

    申请人： Volvo Construction Equipment Holding Sweden AB

    发明人： Koo, Bon Seok

    IPC分类号： F15B11/16 ,  E02F9/22 ,  F15B11/17

    CPC分类号： E02F9/2239 ,  E02F9/2282 ,  E02F9/2285 ,  E02F9/2292 ,  F15B11/16 ,  F15B11/17 ,  F15B2211/20523 ,  F15B2211/20576 ,  F15B2211/265 ,  F15B2211/30505 ,  F15B2211/30595 ,  F15B2211/3116 ,  F15B2211/329 ,  F15B2211/50518 ,  F15B2211/5151 ,  F15B2211/7142

    摘要： A hydraulic circuit for construction equipment is disclosed, which can prevent an abrupt rotation of a swing device when a switching valve (7,8) for the swing device is shifted in a state that switching valves (3,4,1,2,5,6) for a traveling device and a working device have been shifted. The hydraulic circuit includes first to fourth hydraulic pumps (P 1 ,P 2 ,P 3 ,P 4 ); first to six (1-6) switching valves installed in the first to second hydraulic pumps, respectively, and shifted to control hydraulic fluid fed to working devices or traveling devices; a confluence switching valve (9) installed in the third hydraulic pump (P 3 ) and shifted to supply the hydraulic fluid to the working devices (1,2,5,6) on the first (P 1 ) and second (P 2 ) hydraulic pump sides; signal lines (15,16) for the traveling devices and the working devices; a first valve (21) connected between the signal line (15) for the traveling device and an intersection between the signal line (17) for the confluence switching valve (9) and a tank line (18); and a second valve (22) installed in a flow path (17a) between the first valve (21) and the tank line (18), shifted to discharge pressure in the signal line (17) for the confluence switching valve (9) to the tank line (18) or to block the flow path (17a) to form the signal pressure in the signal line (17) for the confluence (9).

    CONSTRUCTION-MACHINE HYDRAULIC CONTROL DEVICE
    4.
    发明公开
    CONSTRUCTION-MACHINE HYDRAULIC CONTROL DEVICE 审中-公开
    施工机械液压控制装置

    公开(公告)号：EP3306112A1

    公开(公告)日：2018-04-11

    申请号：EP16803218.3

    申请日：2016-05-26

    申请人： Hitachi Construction Machinery Co., Ltd.

    发明人： YAMASHITA, Ryohei ,  IMURA, Shinya ,  ISHIKAWA, Kouji ,  MORIKI, Hidekazu ,  AMANO, Hiroaki

    IPC分类号： F15B20/00 ,  E02F9/22 ,  F15B11/04 ,  F15B11/08

    CPC分类号： E02F9/2228 ,  E02F9/2235 ,  E02F9/2296 ,  E02F9/268 ,  F15B11/04 ,  F15B11/044 ,  F15B11/10 ,  F15B20/00 ,  F15B2211/30565 ,  F15B2211/31558 ,  F15B2211/329 ,  F15B2211/353 ,  F15B2211/355 ,  F15B2211/40515 ,  F15B2211/41581 ,  F15B2211/426 ,  F15B2211/6313 ,  F15B2211/6316 ,  F15B2211/6355 ,  F15B2211/665 ,  F15B2211/6654 ,  F15B2211/761 ,  F15B2211/862

    摘要： Disclosed is a hydraulic control system of a construction machine capable of achieving a reduction in meter-out pressure loss in accordance with variation of a negative load acting on a hydraulic actuator and capable of preventing deterioration in operability even when an abnormal condition arises in a pressure sensor detecting the magnitude of a negative load. There are provided meter-out flow lines through which a hydraulic fluid discharged from a hydraulic actuator flows; variable restrictors provided in the meter-out flow lines; a load sensor detecting the magnitude of a negative load which is a load applied to the hydraulic actuator by an external force and which is a load in the same direction as the operating direction of the hydraulic actuator; and a control device which, when the load abnormality sensor does not detect any abnormality in the load sensor, reduces the sum total of the opening areas of the variable restrictors in accordance with an increase in the magnitude of the negative load detected by the load sensor and the operation amount detected by the operation amount sensor and which, when the load abnormality sensor detects abnormality in the load sensor, reduces the sum total of the opening areas of the variable restrictors to a predetermined value in accordance with the operation amount detected by the operation amount sensor.

    摘要翻译： 本发明提供一种建筑机械的液压控制装置，其能够根据作用于液压执行机构的负载的变动来实现出口节流用压力损失的降低，即使在压力产生异常的情况下也能够防止操作性的降低 传感器检测负载的大小。 设有流出液压流体的液压流体的流出流路， 设置在出口流量管线中的可变节流器; 负载传感器，其检测负载的大小，所述负负载是通过外力施加至所述液压致动器的负载，并且所述负载是与所述液压致动器的操作方向相同的方向上的负载; 以及控制装置，当所述负载异常传感器未检测到所述负载传感器中的任何异常时，根据由所述负载传感器检测到的所述负载的大小的增加来减小所述可变节流器的开口面积的总和 以及由所述操作量传感器检测到的操作量，并且当所述负载异常传感器检测到所述负载传感器中的异常时，根据由所述操作量检测器检测到的操作量，将所述可变限制器的开口面积的总和减小到预定值 操作量传感器。

    Hydraulic cylinder for example for use in a hydraulic tool and hydraulic system
    6.
    发明授权
    Hydraulic cylinder for example for use in a hydraulic tool and hydraulic system 有权
    液压缸例如用于液压工具和液压系统

    公开(公告)号：EP2813309B1

    公开(公告)日：2018-01-17

    申请号：EP14171734.8

    申请日：2014-06-10

    申请人： Demolition and Recycling Equipment B.V.

    发明人： De Gier, Gertrudis Maria Gerardus

    IPC分类号： B23D17/00 ,  E02F3/96 ,  F15B20/00 ,  F15B11/024

    CPC分类号： F15B15/149 ,  E02F3/965 ,  E02F9/2267 ,  E02F9/2271 ,  F15B11/022 ,  F15B11/024 ,  F15B13/0401 ,  F15B20/007 ,  F15B2011/0243 ,  F15B2211/30505 ,  F15B2211/3058 ,  F15B2211/329 ,  F15B2211/355 ,  F15B2211/50518 ,  F15B2211/5153 ,  F15B2211/55 ,  F15B2211/775 ,  F15B2211/8636 ,  F15B2211/8752

    摘要： The invention relates to a hydraulic cylinder 20, for example for use in a hydraulic tool, comprising at least one piston/cylinder combination composed of a cylinder body and a piston 14a accommodated in said cylinder body and provided with a piston rod 14 that projects from said cylinder body, wherein the cylinder body and the piston body define a first cylinder chamber 21a while the cylinder body, the piston body and the piston rod define a second cylinder chamber 21b, and wherein during operation the piston performs alternating forward and return operational cycles under the influence of a fluidum under pressure that is conducted to the first and the second cylinder chamber through a first and a second line, respectively, and a control valve 24 which regulates the supply of a fluid under pressure through the first or the second line to the piston/cylinder combination. The invention has for its object to provide an improved actuating cylinder as described above which immediately acts on the hydraulic system in the event of the emergency situations sketched above and which prevents permanent damage to the various components. According to the invention, the hydraulic cylinder is for this purpose characterised in that it comprises a safety valve 40 which is passive in a first position and which in a second position, if the pressure in the second cylinder chamber is higher than a preset load pressure, connects the second cylinder chamber to the first cylinder chamber via a differential valve 30 .

    FLUID PRESSURE CONTROL DEVICE
    8.
    发明公开
    FLUID PRESSURE CONTROL DEVICE 审中-公开
    流体压力控制装置

    公开(公告)号：EP3205888A1

    公开(公告)日：2017-08-16

    申请号：EP15849172.0

    申请日：2015-10-06

    申请人： KYB-YS Co., Ltd.

    发明人： MATSUZAKI, Keiichi ,  KOIKE, Fumiaki

    IPC分类号： F15B11/04 ,  F15B11/00 ,  F15B11/08 ,  F16K31/383 ,  F16K51/00

    CPC分类号： F15B13/01 ,  F15B21/044 ,  F15B2211/30515 ,  F15B2211/329 ,  F16K31/383 ,  F16K51/00

    摘要： A switching valve (22) of a fluid pressure control device (100) includes a pilot chamber (22a) to which pilot pressure is leaded via the pilot valve (10), a spool (36) configured to move in a valve-opening direction in accordance with the pilot pressure in the pilot chamber (22a), a biasing member (41) configured to bias the spool (36) in a valve-closing direction, and a conduction path (46) configured to lead one part of a pilot pressure fluid leaded to the pilot chamber (22a) to a drain passage (40). The conduction path (46) is configured to communicate with the drain passage (40), when the switching valve (22) moves by a predetermined stroke amount or more in the valve-opening direction.

    摘要翻译： 液压控制装置（100）的切换阀（22）具有经由先导阀（10）引导先导压力的先导室（22a），滑阀（36），该滑阀向开阀方向 ，根据先导室（22a）的先导压力，对阀芯（36）向闭阀方向施力的施力部件（41），以及将导阀的一部分导向 高压流体通向先导室（22a）至排放通道（40）。 当切换阀（22）向开阀方向移动规定行程量以上时，导通路（46）与排水路（40）连通。