Abstract:
Brake failure detection system for a construction machine is provided comprising a display means to display the information on the construction machine's operating status and provide warnings for abnormal functions; a memory means for storing normal functional status variables on ranges of variables that can be compared for abnormal status of the construction machine; at least one detection means to detect the construction machine's status variables related to an operating state of the machine or surrounding environment; and an electronic control unit for the construction machine that controls various conditions of the machine and compares the current status variables detected by the detection means with the normal functional status variables stored in said memory means to determine whether the current status variables are in one of three predetermined status levels including, normal, a preliminary warning, and warning.
Abstract:
A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic actuator (110), first and second counter-balance valves (300, 400), first and second control valves (700, 800), and first and second blocking valves (350, 450). A net load (90) is supported by a first chamber (116, 118) of the hydraulic actuator, and a second chamber (118, 116) of the hydraulic actuator may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first blocking valve prevents the fluctuating hydraulic fluid flow from opening the first counter-balance valve. The first blocking valve may drain leakage from the first counter-balance valve.
Abstract:
본 발명에 따른 건설기계용 유압식 비상정지장치는, 전기모터와 전원 사이에 전기적으로 연결 설치되며, 상기 전기모터에 공급되는 전원을 제어하는 전기제어 컨트롤러; 상기 전기제어 컨트롤러와 상기 전원 사이에 전기적으로 연결 설치되며, 비상시에 상기 전기제어 컨트롤러에 인가되는 전기를 차단하는 스위치; 페달 스트로크에 따라서 내부에 저장된 유압을 토출하는 실린더를 구비하며, 운전자에 의한 페달조작에 의해 파일럿 신호압을 제공하는 비상페달; 및 방향절환밸브와 유압 액츄에이터 사이의 유로에 설치되며 상기 파일럿 신호압에 의해 차단 상태로 전환되어 유압펌프로부터 공급되는 작동유를 유압탱크로 드레인시키는 제1 및 제2 전환밸브;를 포함하여 구성된다.
Abstract:
The present disclosure relates to a valve arrangement (60) for a boom control system (30) or for other control systems for work machine (10) components that may be lowered under gravity. The problem addressed is the prevention of the boom (13) or other work machine (10) component from dropping uncontrollably under a hose burst condition. The disclosure provides a valve arrangement (60) for a hydraulic system (30) for raising and lowering a component of a work machine (10). The valve arrangement (60) comprises an inlet (61) and an outlet (62). A pilot operated load control valve (63) is fluidly connected between the inlet (61) and the outlet (62), the load control valve (63) having an energised unidirectional state allowing hydraulic fluid to pass from the outlet (62) to the inlet (61) and a de-energised unidirectional state allowing hydraulic fluid to pass from the inlet (61) to the outlet (62). A pilot conduit (65) is configured to direct pilot hydraulic fluid to actuate the load control valve (63). A connecting conduit (67) fluidly connects the pilot conduit (65) to the inlet (61), the connecting conduit (67) comprising a flow restriction (68) and a check valve (69) configured to allow hydraulic fluid to flow only in a direction from the pilot conduit (65) towards the inlet (61).
Abstract:
유온에 따라 유압펌프로부터 토출되는 유량을 제한하고 유온에 대한 정보를 운전자에게 알려줄 수 있도록 한 보호장치가 구비된 건설기계용 유압시스템을 개시한다. 본 발명에 따른 건설기계용 유압시스템에 있어서, 유압펌프로부터 공급되는 작동유에 의해 작동되는 유압 액츄에이터; 유압펌프와 유압 액츄에이터 사이의 유로에 설치되고 유압펌프로부터 유압 액츄에이터에 공급되는 유량을 제어하는 콘트롤밸브; 콘트롤밸브로부터 작동유 탱크로의 귀환유로에 설치되어 작동유를 냉각시키는 오일쿨러; 작동유 탱크의 유온을 실시간으로 검출하는 유온 센서; 유압펌프의 사판경전각 조절에 의해 유압펌프의 토출유량을 제어하는 유압펌프 레귤레이터; 유온 센서에 의해 검출된 유온과 미리 설정된 유온을 비교하여 검출된 유온이 소정의 하한설정값 이하일 경우 또는 소정의 상한설정값 이상일 경우, 유압펌프의 토출유량을 미리 설정된 설정유량 이하로 제한하기 위해 유압펌프 레귤레이터에 제어신호를 출력하는 콘트롤러를 포함하는 것을 특징으로 하는 보호장치가 구비된 건설기계용 유압시스템을 제공한다.
Abstract:
A dipper assembly for a mining shovel includes a dipper body, a dipper door pivotably coupled to the dipper body, an arm, a housing coupled to one of the body and the door, and a piston. The arm includes a first end pivotably coupled to the body and a second end pivotably coupled to the door. The movement of the door relative to the body drives the arm to pivot relative to the body. The housing includes an inlet in fluid communication with a fluid source, an outlet, and a cylinder partially defining a pump chamber in fluid communication with the inlet and the outlet. The piston is movable within the cylinder and biased in a first direction. The pivoting movement of the arm causes the piston to move in a second direction opposite the first direction. The movement of the piston changes a volume of the pump chamber.