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    • 1. 发明申请
    • HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE, PROVIDED WITH PROTECTION DEVICE
    • 建筑机械液压系统,具有保护装置
    • US20160003265A1
    • 2016-01-07
    • US14768285
    • 2013-02-19
    • Hea-Gyoon JOUNGSung-Gon KIMVOLVO CONSTRUCTION EQUIPMENT AB
    • Hea-Gyoon JOUNGSung-Gon KIM
    • F15B11/042F15B20/00
    • F15B11/0423E02F9/2235E02F9/226E02F9/2296F15B20/00F15B2211/20546F15B2211/3116F15B2211/40F15B2211/45F15B2211/611F15B2211/62F15B2211/6343F15B2211/6652
    • A hydraulic system for a construction machine having a protection device is disclosed, which can limit a flow rate of hydraulic fluid that is discharged from a hydraulic pump in accordance with a hydraulic fluid temperature and notify an operator of information on the hydraulic fluid temperature. The hydraulic system for a construction machine includes a hydraulic actuator operated by hydraulic fluid that is supplied from a hydraulic pump; a control valve installed in a flow path between the hydraulic pump and the hydraulic actuator to control a flow rate of the hydraulic fluid that is supplied from the hydraulic pump to the hydraulic actuator; an oil cooler installed in a return flow path from the control valve to an hydraulic fluid tank to cool the hydraulic fluid; a hydraulic fluid temperature sensor detecting in real time a hydraulic fluid temperature of the hydraulic fluid tank; a hydraulic pump regulator controlling a discharge flow rate of the hydraulic pump through adjustment of an inclination angle of a swash plate of the hydraulic pump; and a controller comparing the hydraulic fluid temperature detected by the hydraulic fluid temperature sensor with a predetermined hydraulic fluid temperature, and outputting a control signal to the hydraulic pump regulator so as to limit the discharge flow rate of the hydraulic pump to or below a predetermined flow rate if the detected hydraulic fluid temperature is equal to or lower than a predetermined lower limit value, or equal to or higher than a predetermined upper limit value.
    • 公开了一种用于具有保护装置的施工机械的液压系统,其可以根据液压流体温度限制从液压泵排出的液压流体的流量,并且向操作者通知关于液压流体温度的信息。 用于建筑机械的液压系统包括由液压泵供应的液压流体操作的液压致动器; 安装在所述液压泵和所述液压致动器之间的流路中的控制阀,以控制从所述液压泵向所述液压致动器供给的所述液压流体的流量; 安装在从控制阀到液压油箱的回流路径中以冷却液压流体的油冷却器; 液压油温度传感器实时检测液压油箱的液压油温度; 液压泵调节器,其通过调节所述液压泵的斜板的倾斜角度来控制所述液压泵的排出流量; 以及控制器,将由液压流体温度传感器检测的液压流体温度与预定的液压流体温度进行比较,并将控制信号输出到液压泵调节器,以将液压泵的排出流量限制在或低于预定流量 如果检测到的液压流体温度等于或低于预定的下限值,或者等于或高于预定的上限值的速率。
    • 2. 发明申请
    • FLOW CONTROL DEVICE AND FLOW CONTROL METHOD FOR CONSTRUCTION MACHINE
    • 流量控制装置和流量控制方法
    • US20150361995A1
    • 2015-12-17
    • US14760626
    • 2013-01-18
    • VOLVO CONSTRUCTION EQUIPMENT AB
    • Hea-Gyoon JOUNGSung-Gon KIM
    • F15B11/024F15B13/02
    • F15B11/024E02F9/2217E02F9/2225E02F9/2228E02F9/2282E02F9/2296F15B13/026F15B13/027F15B2211/20546F15B2211/3133F15B2211/505
    • Disclosed are a flow control device and a flow control method for a construction machine for preventing the loss of fluid exhausted from a hydraulic pump when a boom and an arm of an excavator are operated in combination. The flow control device for a construction machine according to the present invention includes: an engine; a variable capacity hydraulic pump connected to the engine; a first hydraulic cylinder and a second hydraulic cylinder connected to the hydraulic pump; a first control valve disposed in a center bypass channel of the hydraulic pump, the first control valve, in neutral, returning the fluid exhausted from the hydraulic pump to a hydraulic tank and, when switched, controlling the driving, stopping, and direction change of the first hydraulic cylinder; a second control valve disposed downstream of the center bypass channel of the hydraulic pump, the second control valve, in neutral, returning the fluid exhausted from the hydraulic pump to the hydraulic tank and, when switched, controlling the driving, stopping, and direction change of the second hydraulic cylinder; a regeneration fluid channel for supplementing and reusing fluid returned to the hydraulic tank during a compression stroke of the first hydraulic cylinder, and a regeneration valve disposed in the regeneration fluid channel; and a pressure-compensated flow control valve which is disposed in a meter-in fluid channel of a spool of the first control valve and limits the quantity of working fluid supplied from the hydraulic pump to the first hydraulic cylinder when the first hydraulic cylinder and the second hydraulic cylinder are operated in combination.
    • 公开了一种用于在挖掘机的动臂和臂组合操作时防止从液压泵排出的流体损失的施工机械的流量控制装置和流量控制方法。 根据本发明的建筑机械的流量控制装置包括:发动机; 连接到发动机的可变容量液压泵; 连接到液压泵的第一液压缸和第二液压缸; 第一控制阀,设置在液压泵的中心旁通通道中,第一控制阀处于空档状态,将从液压泵排出的流体返回到液压箱,并且当切换时,控制驱动,停止和方向变化 第一液压缸; 设置在液压泵的中心旁通通道下游的第二控制阀,第二控制阀处于空档状态,将从液压泵排出的流体返回到液压箱,并且当切换时控制驱动,停止和方向变化 的第二液压缸; 再生流体通道,用于在第一液压缸的压缩冲程期间补充和重新使用返回到液压箱的流体;再生阀,设置在再生流体通道中; 以及压力补偿流量控制阀,其设置在所述第一控制阀的阀芯的流入通道中,并且当所述第一液压缸和所述第一液压缸和所述第二液压缸 第二液压缸组合操作。
    • 5. 发明申请
    • HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINE
    • 建筑机械液压回路
    • US20160160883A1
    • 2016-06-09
    • US14906141
    • 2013-07-24
    • VOLVO CONSTRUCTION EQUIPMENT AB
    • Hea-Gyoon JOUNGSung-Gon KIM
    • F15B11/16E02F9/22
    • F15B11/16E02F9/2225E02F9/2228E02F9/2267E02F9/2282E02F9/2285E02F9/2296F15B2211/35F15B2211/355F15B2211/36F15B2211/40515F15B2211/41554F15B2211/45F15B2211/575F15B2211/6316F15B2211/6654F15B2211/67
    • A hydraulic circuit for a construction machine is disclosed, which can prevent a loss of pressure during a combined work. The hydraulic circuit includes a variable displacement hydraulic pump, at least two hydraulic actuators driven by hydraulic fluid that is supplied from the hydraulic pump, control valves installed in a center bypass path of the hydraulic pump and shifted to control a start, a stop, and a direction change of the hydraulic actuators, parallel flow paths having inlets branched and connected to predetermined positions on an uppermost stream side of the center bypass path and outlets connected to inlet ports of the control valves, bleed-off paths formed on the control valves other than the lowermost downstream side control valve among the control valves to selectively communicate with the center bypass path, the bleed-off paths communicating with the center bypass path when the plurality of control valves are shifted for a combined work, and a switching valve installed on a lowermost downstream side of the center bypass path to intercept the center bypass path when pilot signal pressure is applied.
    • 公开了一种用于建筑机械的液压回路,其可以防止在组合作业期间的压力损失。 液压回路包括可变容量液压泵,由液压泵供给的至少两个由液压流体驱动的液压致动器,安装在液压泵的中心旁路路径中的控制阀,并转移以控制起动,停止和 液压致动器的方向改变,具有分流并连接到中心旁路路径的最上游侧上的预定位置的入口的平行流路和连接到控制阀的入口的出口,形成在控制阀上的排出路径其他 所述控制阀中的最下游侧控制阀与所述中心旁通路径选择性地连通,所述排出路径在所述多个控制阀被移动以进行组合作业时与所述中心旁路通路连通,所述切换阀安装在 中心旁路路径的最下游侧,以在导频信号压力时拦截中心旁路路径 应用。