A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
HYDRAULIC SYSTEM FOR CONSTRUCTION EQUIPMENT
압력보상밸브가 구비된 유압시스템에 있어서 선회와 작업장치를 조작하는 복합작동시 조작성을 향상하기 위한 유압시스템을 개시한다. 본 발명에 따른 건설기계용 유압시스템에 있어서, 유압펌프와, 작업장치 및 선회용 조작장치와, 유압펌프에 연결되는 작업장치용 액츄에이터 및 선회모터와, 액츄에이터에 공급되는 작동유를 제어하는 제1제어밸브와, 선회모터에 공급되는 작동유를 제어하는 제2제어밸브와, 액츄에이터의 부하압력을 검출하는 유로에 설치되며 부하압력중 최대 압력을 취하는 체크밸브와, 최대 로드센싱 압력과 제1제어밸브 토출유로 압력차에 의해 개구량이 제어되는 제1압력보상밸브와, 최대 로드센싱 압력과 제2제어밸브 토출유로 압력차에 의해 개구량이 제어되는 제2압력보상밸브와, 최대 로드센싱 압력라인의 압력을 검출하는 최대부하압력센서와, 유압펌프의 토출유량을 제어하는 제어부를 구비하되, 선회와 작업장치를 복합작동시킬 경우 선회측 부하압력이 작업장치측 제1압력보상밸브에 연결되지않도록 구성된 것을 특징으로하는 유압시스템을 제공한다.
A hydraulic system for a construction machine having a pressure compensation valve is disclosed, which improves operability when a combined operation of a swing device and an attachment is performed. The hydraulic system includes a hydraulic pump, attachment and swing operation devices, an attachment actuator and a swing motor connected to the hydraulic pump, a first control valve controlling hydraulic fluid being supplied to the actuator, a second control valve controlling hydraulic fluid being supplied to the swing motor, a check valve installed on a flow path for detecting load pressures of the actuator to take a maximum pressure of the load pressures, a first pressure compensation valve having an opening amount that is controlled by a difference between the maximum load sensing pressure and the pressure of a discharge flow path of the first control valve, a second pressure compensation valve having an opening amount that is controlled by a difference between the maximum load sensing pressure and the pressure of the discharge flow path of the second control valve, a maximum load pressure sensor detecting the pressure of a maximum load sensing pressure line, and a control unit controlling a discharge flow rate of the hydraulic pump, wherein the system is configured so that the swing load pressure is not connected to the first pressure compensation valve on the attachment side when a combined operation of the swing device and the attachment is performed.
HYDRAULIC SYSTEM FOR CONSTRUCTION EQUIPMENT
압력보상밸브가 구비된 유압시스템에 있어서 선회와 작업장치를 조작하는 복합작동시 조작성을 향상하기 위한 유압시스템을 개시한다. 본 발명에 따른 건설기계용 유압시스템에 있어서, 유압펌프와, 작업장치 및 선회용 조작장치와, 유압펌프에 연결되는 작업장치용 액츄에이터 및 선회모터와, 액츄에이터에 공급되는 작동유를 제어하는 제1제어밸브와, 선회모터에 공급되는 작동유를 제어하는 제2제어밸브와, 액츄에이터의 부하압력을 검출하는 유로에 설치되며 부하압력중 최대 압력을 취하는 체크밸브와, 최대 로드센싱 압력과 제1제어밸브 토출유로 압력차에 의해 개구량이 제어되는 제1압력보상밸브와, 최대 로드센싱 압력과 제2제어밸브 토출유로 압력차에 의해 개구량이 제어되는 제2압력보상밸브와, 최대 로드센싱 압력라인의 압력을 검출하는 최대부하압력센서와, 유압펌프의 토출유량을 제어하는 제어부를 구비하되, 선회와 작업장치를 복합작동시킬 경우 선회측 부하압력이 작업장치측 제1압력보상밸브에 연결되지않도록 구성된 것을 특징으로하는 유압시스템을 제공한다.
A hydraulic system for a construction machine having a pressure compensation valve is disclosed, which improves operability when a combined operation of a swing device and an attachment is performed. The hydraulic system includes a hydraulic pump, attachment and swing operation devices, an attachment actuator and a swing motor connected to the hydraulic pump, a first control valve controlling hydraulic fluid being supplied to the actuator, a second control valve controlling hydraulic fluid being supplied to the swing motor, a check valve installed on a flow path for detecting load pressures of the actuator to take a maximum pressure of the load pressures, a first pressure compensation valve having an opening amount that is controlled by a difference between the maximum load sensing pressure and the pressure of a discharge flow path of the first control valve, a second pressure compensation valve having an opening amount that is controlled by a difference between the maximum load sensing pressure and the pressure of the discharge flow path of the second control valve, a maximum load pressure sensor detecting the pressure of a maximum load sensing pressure line, and a control unit controlling a discharge flow rate of the hydraulic pump, wherein the system is configured so that the swing load pressure is not connected to the first pressure compensation valve on the attachment side when a combined operation of the swing device and the attachment is performed.
HYDRAULIC SYSTEM FOR CONSTRUCTION EQUIPMENT
건설기계용 유압시스템
2016-09-13
Patent
Electronic Resource
Korean
IPC:
E02F
Baggern
,
DREDGING