WO2014061834A1 - Automatic pressure control device for construction machine - Google Patents

Automatic pressure control device for construction machine Download PDF

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Publication number
WO2014061834A1
WO2014061834A1 PCT/KR2012/008439 KR2012008439W WO2014061834A1 WO 2014061834 A1 WO2014061834 A1 WO 2014061834A1 KR 2012008439 W KR2012008439 W KR 2012008439W WO 2014061834 A1 WO2014061834 A1 WO 2014061834A1
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WO
WIPO (PCT)
Prior art keywords
pressure
relief valve
main
main relief
hydraulic
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PCT/KR2012/008439
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French (fr)
Korean (ko)
Inventor
강민혁
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
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Priority to PCT/KR2012/008439 priority Critical patent/WO2014061834A1/en
Publication of WO2014061834A1 publication Critical patent/WO2014061834A1/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2282—Systems using center bypass type changeover valves
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/007—Overload
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5157—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/526—Pressure control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components

Definitions

  • the present invention relates to a pressure automatic control device for a construction machine, and more particularly, to a pressure control device for a construction machine to maintain a constant initial setting pressure of the main relief valve for setting the maximum pressure of the hydraulic system.
  • the engine 1 The engine 1,
  • a hydraulic actuator 4 such as a boom cylinder connected to the main hydraulic pump 2,
  • a control valve (5) installed in the flow path between the main hydraulic pump (2) and the hydraulic actuator (4), for controlling the starting, stopping, and direction change of the hydraulic actuator (4) at the time of switching;
  • An operation lever 6 which outputs an operation signal in proportion to the operation amount during operation by the driver
  • the hydraulic system is provided with a main relief valve (7) for relief of the hydraulic oil of the excess pressure to the hydraulic tank (T) in the event of an overload exceeding the set pressure.
  • the pilot signal pressure from the pilot pump 3 is input to the hydraulic pressure port of the control valve 5, so that the internal spool is left or right in the drawing. It is switched to the right direction.
  • the hydraulic system can maintain the maximum pressure set by the main relief valve 7.
  • the pressure of the main relief valve (7) is set to two pressures of standard pressure and high pressure, it is possible to work by increasing the pressure of the hydraulic system from standard pressure to high pressure according to the working conditions. That is, it is possible to increase the pressure to the set maximum pressure of the main relief valve 7 by the pilot pressure pressurized from the pilot pump (3).
  • the increase in the operating time of the construction machine causes a wear phenomenon of the internal components constituting the main relief valve (7), a pressure-down phenomenon that a pressure lower than the initially set maximum pressure of the hydraulic system is formed according to the amount of wear.
  • the change of the hydraulic system temperature inside the construction machine causes a change in the maximum pressure of the hydraulic system.
  • the set pressure of the hydraulic system can be kept constant, and the automatic control of the pressure for construction machinery, which allows the driver to easily reset through the operation of buttons on the work display window when the setting pressure of the main relief valve is changed. Associated with the device.
  • a hydraulic actuator connected to the main hydraulic pump
  • a control valve installed in a flow path between the main hydraulic pump and the hydraulic actuator and controlling the start, stop and direction change of the hydraulic actuator at the time of switching;
  • An operation lever for outputting an operation signal in proportion to the operation amount during operation by the driver
  • a main relief valve installed in a discharge flow path of the main hydraulic pump
  • a first pressure sensor installed in a flow path between the main hydraulic pump and the main relief valve and detecting a set pressure of the hydraulic system in relief in real time and outputting a detection signal
  • a second pressure sensor installed in a flow path between the main relief valve and the hydraulic tank, the second pressure sensor configured to detect the outlet pressure of the main relief valve in real time and output a detection signal during relief;
  • An electronic proportional control valve for generating a secondary pilot pressure and outputting the secondary pilot pressure to the main relief valve so as to be proportional or inversely proportional to the control signal input to adjust the setting pressure of the main relief valve;
  • a control unit for outputting a control signal to the electromagnetic proportional control valve to variably adjust the setting pressure of the main relief valve according to a detection signal input in real time from the first and second pressure sensors.
  • a control unit for outputting a control signal to the electromagnetic proportional control valve to variably adjust the setting pressure of the main relief valve according to a detection signal input in real time from the first and second pressure sensors.
  • a work display window provided with a key or a button for inputting an operation signal to the control unit so that a setting pressure of the main relief valve can be adjusted to a preset pressure by operating a key or a button by a driver.
  • Automatic pressure control device for a construction machine according to an embodiment of the present invention configured as described above has the following advantages.
  • FIG. 1 is a hydraulic circuit diagram of a pressure control device for a construction machine according to the prior art
  • FIG. 2 is a hydraulic circuit diagram of an automatic pressure control device for a construction machine according to an embodiment of the present invention.
  • FIG. 2 is a hydraulic circuit diagram of a pressure automatic control device for a construction machine according to a preferred embodiment of the present invention.
  • the engine 1 The engine 1,
  • a hydraulic actuator for example, a boom cylinder, etc. 4 connected to the main hydraulic pump 2;
  • a control valve (5) installed in a flow path between the main hydraulic pump (2) and the hydraulic actuator (4) and controlling the start, stop and direction change of the hydraulic actuator (4) during switching;
  • An operation lever (RCV) 6 which outputs an operation signal in proportion to the operation amount during operation by the driver;
  • a main relief valve 7 installed in the discharge flow path of the main hydraulic pump 2;
  • a second pressure sensor 9 which detects and outputs a detection signal
  • Electron proportional control valve 10 for generating a secondary pilot pressure to output to the main relief valve (7) so as to be proportional or inversely proportional to the control signal input from the outside to adjust the set pressure of the main relief valve (7) and ,
  • a work display window provided with a key or a button for inputting an operation signal to the controller 11 so that a setting pressure of the main relief valve 7 can be adjusted to a preset pressure by operating a key or a button by a driver ( Not shown).
  • the pilot signal pressure from the pilot pump 3 is input to the hydraulic pressure port of the control valve 5, so that the internal spool is left or right in the drawing. It is switched to the right direction.
  • the hydraulic oil from the main hydraulic pump 2 is supplied to the hydraulic actuator 4 via the control valve 5 in which the spool is switched, so that the boom and the like can be operated.
  • the hydraulic system can maintain the maximum pressure set by the main relief valve 7.
  • the first pressure sensor 8 installed at the inlet side of the main relief valve 7 detects the maximum pressure of the hydraulic system at the time of relief in real time, and the electric signal corresponding to the detected pressure is controlled by the controller 11. Is sent to.
  • the second pressure sensor 9 installed at the outlet side of the main relief valve 7 at the time of relief detects the outlet side pressure at the time of relief in real time, and the electric signal corresponding to the detected pressure is transmitted to the controller 11. Is sent.
  • control unit 11 may variably adjust the pressure of the main relief valve 7 by comparing and analyzing the electric signals input in real time from the first and second pressure sensors 8 and 9 with previously stored data. In order to transmit the electric signal to the electronic proportional control valve (10).
  • the electromagnetic proportional control valve 10 generates a secondary pilot pressure corresponding to the electric signal input from the control unit 11, so that the main relief valve 7 maintains the set pressure. Will be pressed.
  • the electromagnetic proportional control valve 10 generates a secondary pilot pressure corresponding to the input electric signal to pressurize the main relief valve 7, so that the electromagnetic proportional control valve 10 can be boosted to the initial setting pressure of the main relief valve 7. Will be.
  • the electromagnetic proportional control valve 10 generates a secondary pilot pressure corresponding to the input electric signal to pressurize the main relief valve 7, so that the initial setting pressure of the main relief valve 7 can be maintained. do.
  • the setting pressure of the main relief valve 7 can be automatically and repeatedly adjusted.
  • the control signal according to the operation of the key or button provided in the work display window by the driver is transmitted to the control unit 11.
  • control unit 11 transmits an electric signal corresponding to the input operation signal to the electromagnetic proportional control valve 10, and the main relief valve is generated by the secondary pilot pressure generated by the electromagnetic proportional control valve 10. (7) is pressed.

Abstract

Disclosed is an automatic pressure control device for a construction machine for constantly maintaining an initially set pressure of a main relief valve which sets a maximum pressure of a hydraulic system. According to the present invention, provided is an automatic pressure control device for a construction machine, which is applied to a construction machine comprising an engine, a main hydraulic pump, a pilot pump, a hydraulic actuator, a control valve, an operating lever and a main relief valve, and comprises: a first pressure sensor provided at a flow path between the main hydraulic pump and the main relief valve to detect in real-time a set pressure of a hydraulic system during pressure relief and output a detection signal; a second pressure sensor provided at a flow path between the main relief valve and a hydraulic tank to detect in real-time an outlet-side pressure of the main relief valve during pressure relief and output a detection signal; an electronic proportional control valve for generating a pilot pressure so as to be proportional or inversely proportional to a control signal inputted to adjust a set pressure of the main relief valve and outputting the generated pilot pressure to the main relief valve; and a control unit for outputting a control signal, by which the set pressure of the main relief valve can be variable adjusted, to the electronic proportional control valve according to the detection signals inputted in real-time from the first and second pressure sensors.

Description

건설기계용 압력 자동 제어장치Pressure automatic control device for construction machinery
본 발명은 건설기계용 압력 자동 제어장치에 관한 것으로, 특히 유압시스템의 최고 압력을 설정하는 메인 릴리프밸브의 초기 셋팅 압력을 일정하게 유지할 수 있도록 한 건설기계용 압력 자동 제어장치에 관한 것이다.The present invention relates to a pressure automatic control device for a construction machine, and more particularly, to a pressure control device for a construction machine to maintain a constant initial setting pressure of the main relief valve for setting the maximum pressure of the hydraulic system.
도 1에 도시된 종래 기술에 의한 건설기계용 압력 제어장치는,Pressure control apparatus for construction machinery according to the prior art shown in Figure 1,
엔진(1)과,The engine 1,
엔진(1)에 연결되는 메인 유압펌프(2) 및 파일럿 펌프(3)와,A main hydraulic pump 2 and a pilot pump 3 connected to the engine 1,
메인 유압펌프(2)에 연결되는 붐실린더 등의 유압 액츄에이터(4)와,A hydraulic actuator 4 such as a boom cylinder connected to the main hydraulic pump 2,
메인 유압펌프(2)와 유압 액츄에이터(4) 사이의 유로에 설치되고, 절환시 유압 액츄에이터(4)의 기동, 정지 및 방향 전환을 제어하는 컨트롤밸브(5)와,A control valve (5) installed in the flow path between the main hydraulic pump (2) and the hydraulic actuator (4), for controlling the starting, stopping, and direction change of the hydraulic actuator (4) at the time of switching;
운전자에 의한 조작시 조작량에 비례하여 조작신호를 출력하는 조작레버(6)(RCV)와,An operation lever 6 (RCV) which outputs an operation signal in proportion to the operation amount during operation by the driver;
메인 유압펌프(2)의 토출 유로에 설치되며, 유압시스템에 설정 압력을 초과하는 과부하 발생시 초과된 압력의 작동유를 유압탱크(T)로 릴리프시키는 메인 릴리프밸브(7)를 구비한다.It is provided in the discharge flow path of the main hydraulic pump (2), the hydraulic system is provided with a main relief valve (7) for relief of the hydraulic oil of the excess pressure to the hydraulic tank (T) in the event of an overload exceeding the set pressure.
전술한 구성에 따르면, 운전자에 의해 상기 조작레버(6)를 조작하는 경우, 파일럿 펌프(3)로부터의 파일럿 신호압이 컨트롤밸브(5)의 수압포트에 입력되므로 내부 스풀이 도면상, 좌측 또는 우측 방향으로 절환된다.According to the above-described configuration, when the operation lever 6 is operated by a driver, the pilot signal pressure from the pilot pump 3 is input to the hydraulic pressure port of the control valve 5, so that the internal spool is left or right in the drawing. It is switched to the right direction.
따라서, 메인 유압펌프(2)로부터의 작동유가 상기 스풀이 절환된 컨트롤밸브(5)를 경유하여 유압 액츄에이터(4)에 공급되므로 붐 등을 작동시킬 수 있게 된다. Therefore, since the hydraulic oil from the main hydraulic pump 2 is supplied to the hydraulic actuator 4 via the control valve 5 in which the spool is switched, the boom and the like can be operated.
이때, 메인 유압펌프(2)의 토출유로에 설정 압력을 초과하는 과부하가 발생되는 경우, 초과된 압력의 작동유를 메인 릴리프밸브(7)를 통과시켜 유압탱크(T)로 귀환시킨다.At this time, when an overload exceeding the set pressure occurs in the discharge flow path of the main hydraulic pump 2, the hydraulic oil of the excess pressure passes through the main relief valve 7 to be returned to the hydraulic tank (T).
따라서, 유압시스템은 메인 릴리프밸브(7)에 의해 설정된 최고 압력을 유지할 수 있게 된다.Therefore, the hydraulic system can maintain the maximum pressure set by the main relief valve 7.
한편, 상기 메인 릴리프밸브(7)의 압력은 표준압과, 고압의 두 가지 압력으로 설정되어 있어, 작업 조건에 따라 유압시스템의 압력을 표준압에서 고압으로 승압시켜 작업할 수 있도록 되어 있다. 즉 상기 파일럿 펌프(3)로부터 가압되는 파일럿 압력에 의해 메인 릴리프밸브(7)의 설정된 최고 압력으로 승압시킬 수 있게 된다.On the other hand, the pressure of the main relief valve (7) is set to two pressures of standard pressure and high pressure, it is possible to work by increasing the pressure of the hydraulic system from standard pressure to high pressure according to the working conditions. That is, it is possible to increase the pressure to the set maximum pressure of the main relief valve 7 by the pilot pressure pressurized from the pilot pump (3).
한편, 건설기계의 가동시간 증가에 따라 메인 릴리프밸브(7)를 이루는 내부 부품의 마모 현상을 초래하고, 마모량에 따라 유압시스템의 초기 설정된 최고 압력보다 낮은 압력이 형성되는 압력다운 현상이 발생된다. 또한 건설기계 내부의 작동유 온도 변화에 의해서도 유압시스템 최고 압력의 변화는 발생하게 된다.On the other hand, the increase in the operating time of the construction machine causes a wear phenomenon of the internal components constituting the main relief valve (7), a pressure-down phenomenon that a pressure lower than the initially set maximum pressure of the hydraulic system is formed according to the amount of wear. In addition, the change of the hydraulic system temperature inside the construction machine causes a change in the maximum pressure of the hydraulic system.
따라서, 유압시스템에 허용범위를 초과하는 압력 다운이 발생되는 경우에 작업자가 직접 수동으로 압력 조정을 해야되는 어려움이 발생된다. 즉 작업자가 유압시스템의 최고 압력을 측정해가면서 메인 릴리프밸브(7)의 조정나사의 조정을 통하여 메인 릴리프밸브(7)의 최고 셋팅 압력을 재설정 해야되는 번거러움을 갖는다. Therefore, in the case where a pressure drop exceeding an allowable range occurs in the hydraulic system, a difficulty arises in that the operator must manually adjust the pressure. That is, the operator has the trouble of resetting the maximum setting pressure of the main relief valve 7 by adjusting the adjusting screw of the main relief valve 7 while measuring the maximum pressure of the hydraulic system.
또한, 작업자가 유압시스템의 최고 압력을 조정하기 위해서는 압력을 조정하는 동안 건설기계에 의한 작업을 멈추어야되는 문제점이 발생된다.In addition, in order for the operator to adjust the maximum pressure of the hydraulic system, a problem arises in that the work by the construction machine must be stopped while adjusting the pressure.
본 발명의 실시예는, 유압시스템의 설정 압력을 일정하게 유지할 수 있으며, 메인 릴리프밸브의 셋팅 압력 변경시 운전자가 작업표시창의 버튼 등의 조작을 통해 간편하게 재설정할 수 있도록 한 건설기계용 압력 자동 제어장치와 관련된다.According to the embodiment of the present invention, the set pressure of the hydraulic system can be kept constant, and the automatic control of the pressure for construction machinery, which allows the driver to easily reset through the operation of buttons on the work display window when the setting pressure of the main relief valve is changed. Associated with the device.
본 발명의 일 실시예에 의한 건설기계용 압력 자동 제어장치는,Automatic pressure control device for construction machinery according to an embodiment of the present invention,
엔진과,Engine,
상기 엔진에 연결되는 메인 유압펌프 및 파일럿 펌프와,A main hydraulic pump and a pilot pump connected to the engine;
상기 메인 유압펌프에 연결되는 유압 액츄에이터와,A hydraulic actuator connected to the main hydraulic pump;
상기 메인 유압펌프와 상기 유압 액츄에이터 사이의 유로에 설치되고, 절환시 유압 액츄에이터의 기동, 정지 및 방향 전환을 제어하는 컨트롤밸브와,A control valve installed in a flow path between the main hydraulic pump and the hydraulic actuator and controlling the start, stop and direction change of the hydraulic actuator at the time of switching;
운전자에 의한 조작시 조작량에 비례하여 조작신호를 출력하는 조작레버와,An operation lever for outputting an operation signal in proportion to the operation amount during operation by the driver;
상기 메인 유압펌프의 토출 유로에 설치되는 메인 릴리프밸브와,A main relief valve installed in a discharge flow path of the main hydraulic pump;
상기 메인 유압펌프와 메인 릴리프밸브 사이의 유로에 설치되며, 릴리프시 유압시스템의 설정 압력을 실시간으로 검출하여 검출신호를 출력하는 제1압력센서와,A first pressure sensor installed in a flow path between the main hydraulic pump and the main relief valve and detecting a set pressure of the hydraulic system in relief in real time and outputting a detection signal;
상기 메인 릴리프밸브와 유압탱크 사이의 유로에 설치되며, 릴리프시 메인 릴리프밸브의 출구측 압력을 실시간으로 검출하여 검출신호를 출력하는 제2압력센서와,A second pressure sensor installed in a flow path between the main relief valve and the hydraulic tank, the second pressure sensor configured to detect the outlet pressure of the main relief valve in real time and output a detection signal during relief;
상기 메인 릴리프밸브의 셋팅 압력을 조정하기 위해 입력되는 제어신호에 비례 또는 반비례하도록 2차 파일럿 압력을 생성하여 상기 메인 릴리프밸브에 출력하는 전자비례제어밸브와,An electronic proportional control valve for generating a secondary pilot pressure and outputting the secondary pilot pressure to the main relief valve so as to be proportional or inversely proportional to the control signal input to adjust the setting pressure of the main relief valve;
상기 제1,2압력센서들로부터 실시간으로 입력되는 검출신호에 따라 상기 메인 릴리프밸브의 셋팅 압력을 가변 조정할 수 있는 제어신호를 상기 전자비례제어밸브에 출력하는 제어부를 포함하는 것을 특징으로 하는 건설기계용 압력 자동 제어장치를 제공한다.And a control unit for outputting a control signal to the electromagnetic proportional control valve to variably adjust the setting pressure of the main relief valve according to a detection signal input in real time from the first and second pressure sensors. Provides a pressure automatic control device.
운전자에 의해 키이 또는 버튼을 조작하여 상기 메인 릴리프밸브의 셋팅 압력을 미리 설정된 압력으로 조정할 수 있도록, 상기 제어부에 조작신호를 입력할 수 있는 키이 또는 버튼이 구비된 작업표시창을 포함하는 것을 특징으로 한다.And a work display window provided with a key or a button for inputting an operation signal to the control unit so that a setting pressure of the main relief valve can be adjusted to a preset pressure by operating a key or a button by a driver. .
전술한 바와 같이 구성되는 본 발명의 실시예에 의한 건설기계용 압력 자동 제어장치는 아래와 같은 이점을 갖는다.Automatic pressure control device for a construction machine according to an embodiment of the present invention configured as described above has the following advantages.
유압시스템의 설정 압력을 일정하게 유지할 수 있어 신뢰성을 제공하며, 메인 릴리프밸브의 셋팅 압력 변경시 운전자가 작업표시창의 버튼 등의 조작을 통해 간편하게 재설정하므로 편리하고, 또한 건설기계에 의한 작업을 멈추는 시간을 최소화할 수 있다.It provides reliability by maintaining the set pressure of the hydraulic system and it is convenient because the operator can easily reset by operating the buttons on the work display window when changing the setting pressure of the main relief valve, and it is convenient to stop the work by the construction machine. Can be minimized.
도 1은 종래 기술에 의한 건설기계용 압력 제어장치의 유압회로도,1 is a hydraulic circuit diagram of a pressure control device for a construction machine according to the prior art,
도 2는 본 발명의 일 실시예에 의한 건설기계용 압력 자동 제어장치의 유압회로도이다.2 is a hydraulic circuit diagram of an automatic pressure control device for a construction machine according to an embodiment of the present invention.
〈도면의 주요 부분에 대한 참조 부호의 설명〉<Explanation of reference numerals for the main parts of the drawings>
1; 엔진One; engine
2; 메인 유압펌프2; Main hydraulic pump
3; 파일럿 펌프3; Pilot pump
4; 유압 액츄에이터4; Hydraulic actuator
5; 컨트롤밸브5; Control valve
6; 조작레버(RCV)6; Operating lever (RCV)
7; 메인 릴리프밸브7; Main relief valve
8; 제1압력센서8; 1st pressure sensor
9; 제2압력센서9; Second pressure sensor
10; 전자비례제어밸브10; Electronic proportional control valve
11; 제어부11; Control
이하, 첨부도면을 참조하여 본 발명의 바람직한 실시예에 따른 건설기계용 압력 자동 제어장치를 설명하기로 한다.Hereinafter, with reference to the accompanying drawings will be described a pressure automatic control apparatus for a construction machine according to a preferred embodiment of the present invention.
도 2는 본 발명의 바람직한 실시예에 따른 건설기계용 압력 자동 제어장치의 유압회로도이다.2 is a hydraulic circuit diagram of a pressure automatic control device for a construction machine according to a preferred embodiment of the present invention.
도 2를 참조하면, 본 발명의 일 실시예에 따른 건설기계용 압력 자동 제어장치는,2, the automatic pressure control apparatus for a construction machine according to an embodiment of the present invention,
엔진(1)과,The engine 1,
상기 엔진(1)에 연결되는 메인 유압펌프(2) 및 파일럿 펌프(3)와,A main hydraulic pump 2 and a pilot pump 3 connected to the engine 1,
상기 메인 유압펌프(2)에 연결되는 유압 액츄에이터(일 예로서 붐실린더 등을 말함)(4)와,A hydraulic actuator (for example, a boom cylinder, etc.) 4 connected to the main hydraulic pump 2;
상기 메인 유압펌프(2)와 상기 유압 액츄에이터(4) 사이의 유로에 설치되고, 절환시 유압 액츄에이터(4)의 기동, 정지 및 방향 전환을 제어하는 컨트롤밸브(5)와,A control valve (5) installed in a flow path between the main hydraulic pump (2) and the hydraulic actuator (4) and controlling the start, stop and direction change of the hydraulic actuator (4) during switching;
운전자에 의한 조작시 조작량에 비례하여 조작신호를 출력하는 조작레버(RCV)(6)와,An operation lever (RCV) 6 which outputs an operation signal in proportion to the operation amount during operation by the driver;
상기 메인 유압펌프(2)의 토출 유로에 설치되는 메인 릴리프밸브(7)와,A main relief valve 7 installed in the discharge flow path of the main hydraulic pump 2;
상기 메인 유압펌프(2)와 메인 릴리프밸브(7) 사이의 유로에 설치되며(메인 릴리프밸브(7)의 입구측에 설치되는 것임), 릴리프시 유압시스템의 설정 압력을 실시간으로 검출하여 검출신호를 출력하는 제1압력센서(8)와,It is installed in the flow path between the main hydraulic pump (2) and the main relief valve (7) is installed on the inlet side of the main relief valve (7), and detects the set pressure of the hydraulic system in real time to detect the detection signal A first pressure sensor 8 for outputting the
상기 메인 릴리프밸브(7)와 유압탱크(T) 사이의 유로에 설치되며(메인 릴리프밸브(7)의 출구측에 설치되는 것임), 릴리프시 메인 릴리프밸브(7)의 출구측 압력을 실시간으로 검출하여 검출신호를 출력하는 제2압력센서(9)와,It is installed in the flow path between the main relief valve (7) and the hydraulic tank (T) is installed on the outlet side of the main relief valve (7), the relief pressure of the outlet side of the main relief valve (7) in real time A second pressure sensor 9 which detects and outputs a detection signal;
상기 메인 릴리프밸브(7)의 셋팅 압력을 조정하기 위해 외부로부터 입력되는 제어신호에 비례 또는 반비례하도록 2차 파일럿 압력을 생성하여 상기 메인 릴리프밸브(7)에 출력하는 전자비례제어밸브(10)와,Electron proportional control valve 10 for generating a secondary pilot pressure to output to the main relief valve (7) so as to be proportional or inversely proportional to the control signal input from the outside to adjust the set pressure of the main relief valve (7) and ,
상기 제1,2압력센서(8,9)들로부터 실시간으로 입력되는 검출신호에 따라 상기 메인 릴리프밸브(7)의 셋팅 압력을 가변 조정할 수 있는 제어신호를 상기 전자비례제어밸브(10)에 출력하는 제어부(11)를 포함한다.Outputs a control signal to the electromagnetic proportional control valve 10 to variably adjust the setting pressure of the main relief valve 7 according to the detection signals input from the first and second pressure sensors 8 and 9 in real time. And a control unit 11.
운전자에 의해 키이 또는 버튼을 조작하여 상기 메인 릴리프밸브(7)의 셋팅 압력을 미리 설정된 압력으로 조정할 수 있도록, 상기 제어부(11)에 조작신호를 입력할 수 있는 키이 또는 버튼이 구비된 작업표시창(미도시됨)을 포함한다.A work display window provided with a key or a button for inputting an operation signal to the controller 11 so that a setting pressure of the main relief valve 7 can be adjusted to a preset pressure by operating a key or a button by a driver ( Not shown).
전술한 구성에 따르면, 운전자에 의해 상기 조작레버(6)를 조작하는 경우, 파일럿 펌프(3)로부터의 파일럿 신호압이 컨트롤밸브(5)의 수압포트에 입력되므로 내부 스풀이 도면상, 좌측 또는 우측 방향으로 절환된다.According to the above-described configuration, when the operation lever 6 is operated by a driver, the pilot signal pressure from the pilot pump 3 is input to the hydraulic pressure port of the control valve 5, so that the internal spool is left or right in the drawing. It is switched to the right direction.
따라서, 메인 유압펌프(2)로부터의 작동유가 스풀이 절환된 컨트롤밸브(5)를 경유하여 유압 액츄에이터(4)에 공급되므로 붐 등을 작동시킬 수 있게 된다.Therefore, the hydraulic oil from the main hydraulic pump 2 is supplied to the hydraulic actuator 4 via the control valve 5 in which the spool is switched, so that the boom and the like can be operated.
이때, 상기 유압 액츄에이터(4)의 스트로크 엔드시, 메인 유압펌프(2)로부터의 작동유가 계속적으로 유압 액츄에이터(4)에 공급되어 유압시스템의 압력이 설정압력을 초과할 경우, 초과된 압력의 작동유를 메인 릴리프밸브(7)를 통과시켜 유압탱크(T)로 귀환시킨다.At this time, at the stroke end of the hydraulic actuator 4, the hydraulic oil from the main hydraulic pump 2 is continuously supplied to the hydraulic actuator 4, when the pressure of the hydraulic system exceeds the set pressure, the hydraulic oil of the excess pressure Passes through the main relief valve (7) to return to the hydraulic tank (T).
따라서, 유압시스템은 메인 릴리프밸브(7)에 의해 설정된 최고 압력을 유지할 수 있게 된다.Therefore, the hydraulic system can maintain the maximum pressure set by the main relief valve 7.
이때, 상기 메인 릴리프밸브(7)의 입구측에 설치된 제1압력센서(8)에 의해 릴리프시 유압시스템의 최고 압력을 실시간으로 검출하게 되며, 검출된 압력에 해당되는 전기신호는 제어부(11)에 전송된다.At this time, the first pressure sensor 8 installed at the inlet side of the main relief valve 7 detects the maximum pressure of the hydraulic system at the time of relief in real time, and the electric signal corresponding to the detected pressure is controlled by the controller 11. Is sent to.
또한, 릴리프시 메인 릴리프밸브(7)의 출구측에 설치된 제2압력센서(9)에 의해 릴리프시 출구측 압력을 실시간으로 검출하게 되며, 검출된 압력에 해당되는 전기신호는 제어부(11)에 전송된다.In addition, the second pressure sensor 9 installed at the outlet side of the main relief valve 7 at the time of relief detects the outlet side pressure at the time of relief in real time, and the electric signal corresponding to the detected pressure is transmitted to the controller 11. Is sent.
따라서, 상기 제어부(11)는 상기 제1,2압력센서(8,9)들로부터 실시간으로 입력되는 전기신호를 미리 저장된 데이터와 비교 분석하여, 상기 메인 릴리프밸브(7)의 압력을 가변 조정할 수 있도록 전자비례제어밸브(10)에 전기신호를 전송하게 된다.Accordingly, the control unit 11 may variably adjust the pressure of the main relief valve 7 by comparing and analyzing the electric signals input in real time from the first and second pressure sensors 8 and 9 with previously stored data. In order to transmit the electric signal to the electronic proportional control valve (10).
따라서, 상기 전자비례제어밸브(10)는 제어부(11)로부터 입력되는 전기신호에 대응하는 2차 파일럿 압력을 생성하여, 메인 릴리프밸브(7)가 설정압력을 유지할 수 있도록 메인 릴리프밸브(7)를 가압하게 된다.Accordingly, the electromagnetic proportional control valve 10 generates a secondary pilot pressure corresponding to the electric signal input from the control unit 11, so that the main relief valve 7 maintains the set pressure. Will be pressed.
즉, 상기 제1,2압력센서(8,9)에 의해 실시간으로 검출된 메인 릴리프밸브(7)의 입구측 및 출구측 압력이 초기 설정된 압력보다 낮을 경우에, 메인 릴리프밸브(7)의 셋팅 압력을 초기 설정압력으로 높일 수 있도록 제어부(11)로부터 전자비례제어밸브(10)에 전기신호가 입력된다.That is, when the inlet and outlet pressures of the main relief valve 7 detected in real time by the first and second pressure sensors 8 and 9 are lower than the initially set pressure, the setting of the main relief valve 7 is performed. An electrical signal is input from the controller 11 to the electromagnetic proportional control valve 10 so as to increase the pressure to the initial set pressure.
이로 인해, 전자비례제어밸브(10)는 입력된 전기신호에 대응하는 2차 파일럿 압력을 생성하여 메인 릴리프밸브(7)를 가압하게 되므로, 메인 릴리프밸브(7)의 초기 셋팅 압력으로 승압시킬 수 있게 된다.As a result, the electromagnetic proportional control valve 10 generates a secondary pilot pressure corresponding to the input electric signal to pressurize the main relief valve 7, so that the electromagnetic proportional control valve 10 can be boosted to the initial setting pressure of the main relief valve 7. Will be.
한편, 상기 제1,2압력센서(8,9)에 의해 실시간으로 검출된 메인 릴리프밸브(7)의 입구측 및 출구측 압력이 초기 설정된 압력보다 높을 경우에, 메인 릴리프밸브(7)의 셋팅 압력을 초기 설정압력으로 낮출 수 있도록 제어부(11)로부터 전자비례제어밸브(10)에 전기신호가 입력된다.On the other hand, when the inlet and outlet pressures of the main relief valve 7 detected by the first and second pressure sensors 8 and 9 in real time are higher than the initially set pressure, the setting of the main relief valve 7 is performed. An electrical signal is input from the controller 11 to the electromagnetic proportional control valve 10 so as to lower the pressure to the initial set pressure.
이로 인해, 전자비례제어밸브(10)는 입력된 전기신호에 대응하는 2차 파일럿 압력을 생성하여 메인 릴리프밸브(7)를 가압하게 되므로, 메인 릴리프밸브(7)의 초기 셋팅 압력을 유지할 수 있게 된다.As a result, the electromagnetic proportional control valve 10 generates a secondary pilot pressure corresponding to the input electric signal to pressurize the main relief valve 7, so that the initial setting pressure of the main relief valve 7 can be maintained. do.
따라서, 상기 메인 릴리프밸브(7)의 내부 부품의 마모로 인해 유압시스템의 최고 압력이 낮아지는 경우에, 제어부(11)로부터의 제어신호에 대응하여 전자비례제어밸브(10)에서 생성되는 2차 파일럿 압력에 의해 메인 릴리프밸브(7)의 셋팅 압력을 자동으로 반복하여 조정할 수 있게 된다.Therefore, when the maximum pressure of the hydraulic system is lowered due to abrasion of internal components of the main relief valve 7, the secondary generated by the electromagnetic proportional control valve 10 in response to a control signal from the control unit 11. By the pilot pressure, the setting pressure of the main relief valve 7 can be automatically and repeatedly adjusted.
이로 인해 유압시스템의 최고 설정 압력을 일정하게 유지할 수 있게 된다.This makes it possible to keep the maximum set pressure of the hydraulic system constant.
한편, 작업 조건에 따라 유압시스템의 설정 압력을 표준압에서 고압으로 승압시켜 작업하게 되는 경우, 운전자에 의해 작업표시창에 구비된 키이 또는 버튼을 조작함에 따른 제어신호가 제어부(11)에 전송된다.On the other hand, in the case of working by increasing the set pressure of the hydraulic system from the standard pressure to a high pressure according to the working conditions, the control signal according to the operation of the key or button provided in the work display window by the driver is transmitted to the control unit 11.
따라서, 상기 제어부(11)는 입력된 조작신호에 대응하는 전기신호를 전자비례제어밸브(10)에 전송하게 되고, 전자비례제어밸브(10)에 의해 생성되는 2차 파일럿 압력에 의해 메인 릴리프밸브(7)를 가압하게 된다.Accordingly, the control unit 11 transmits an electric signal corresponding to the input operation signal to the electromagnetic proportional control valve 10, and the main relief valve is generated by the secondary pilot pressure generated by the electromagnetic proportional control valve 10. (7) is pressed.
따라서, 운전자가 메인 릴릴프밸브(7)의 셋팅 압력을 조정할 경우, 건설기계를 이용한 작업을 멈추지않고도 간편하게 조정할 수 있게 된다.Therefore, when the driver adjusts the setting pressure of the main relief valve 7, it can be easily adjusted without stopping the work using the construction machine.
여기에서, 상술한 본 발명에서는 바람직한 실시예를 참조하여 설명하였지만, 해당 기술분야에서 숙련된 당업자는 하기의 특허청구범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경할 수 있음을 이해할 수 있을 것이다.Herein, while the present invention has been described with reference to the preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be changed.
전술한 구성을 갖는 본 발명에 따르면, 굴삭기 등에 적용되는 유압시스템의 설정 압력 변경시 운전자가 작업표시창의 버튼 등의 조작을 통해 간편하게 재설정할 수 있는 효과가 있다.According to the present invention having the above-described configuration, there is an effect that the driver can easily reset through the operation of the button of the work display window when changing the set pressure of the hydraulic system applied to the excavator.

Claims (2)

  1. 엔진;engine;
    상기 엔진에 연결되는 메인 유압펌프 및 파일럿 펌프;A main hydraulic pump and a pilot pump connected to the engine;
    상기 메인 유압펌프에 연결되는 유압 액츄에이터;A hydraulic actuator connected to the main hydraulic pump;
    상기 메인 유압펌프와 상기 유압 액츄에이터 사이의 유로에 설치되고, 절환시 유압 액츄에이터의 기동, 정지 및 방향 전환을 제어하는 컨트롤밸브;A control valve installed in a flow path between the main hydraulic pump and the hydraulic actuator and controlling the start, stop, and direction change of the hydraulic actuator during switching;
    조작량에 비례하여 조작신호를 출력하는 조작레버;An operation lever for outputting an operation signal in proportion to the operation amount;
    상기 메인 유압펌프의 토출 유로에 설치되는 메인 릴리프밸브;A main relief valve installed in a discharge flow path of the main hydraulic pump;
    상기 메인 유압펌프와 메인 릴리프밸브 사이의 유로에 설치되며, 릴리프시 유압시스템의 설정 압력을 실시간으로 검출하여 검출신호를 출력하는 제1압력센서;A first pressure sensor installed in a flow path between the main hydraulic pump and the main relief valve and detecting a set pressure of the hydraulic system in relief and outputting a detection signal in real time;
    상기 메인 릴리프밸브와 유압탱크 사이의 유로에 설치되며, 릴리프시 메인 릴리프밸브의 출구측 압력을 실시간으로 검출하여 검출신호를 출력하는 제2압력센서;A second pressure sensor installed in a flow path between the main relief valve and the hydraulic tank, the second pressure sensor detecting the outlet pressure of the main relief valve in real time and outputting a detection signal during relief;
    상기 메인 릴리프밸브의 셋팅 압력을 조정하기 위해 입력되는 제어신호에 비례 또는 반비례하도록 파일럿 압력을 생성하여 상기 메인 릴리프밸브에 출력하는 전자비례제어밸브; 및An electronic proportional control valve configured to generate a pilot pressure to be proportional to or inversely proportional to a control signal input to adjust a set pressure of the main relief valve and output the pilot pressure to the main relief valve; And
    상기 제1,2압력센서들로부터 실시간으로 입력되는 검출신호에 따라 상기 메인 릴리프밸브의 셋팅 압력을 가변 조정할 수 있는 제어신호를 상기 전자비례제어밸브에 출력하는 제어부를 포함하는 것을 특징으로 하는 건설기계용 압력 자동 제어장치.And a control unit for outputting a control signal to the electromagnetic proportional control valve to variably adjust the setting pressure of the main relief valve according to a detection signal input in real time from the first and second pressure sensors. Pressure automatic control device.
  2. 제1항에 있어서, 운전자에 의해 키이 또는 버튼을 조작하여 상기 메인 릴리프밸브의 셋팅 압력을 미리 설정된 압력으로 조정할 수 있도록, 상기 제어부에 조작신호를 입력할 수 있는 키이 또는 버튼이 구비된 작업표시창을 포함하는 것을 특징으로 하는 건설기계용 압력 자동 제어장치.The work display window according to claim 1, further comprising a key or a button for inputting an operation signal to the control unit so that a setting pressure of the main relief valve can be adjusted to a preset pressure by operating a key or a button by a driver. Automatic pressure control device for construction machinery comprising a.
PCT/KR2012/008439 2012-10-16 2012-10-16 Automatic pressure control device for construction machine WO2014061834A1 (en)

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CN113390627A (en) * 2021-06-30 2021-09-14 四川航天烽火伺服控制技术有限公司 Pressure reducing valve centrifugal overload test device
CN113390627B (en) * 2021-06-30 2022-11-15 四川航天烽火伺服控制技术有限公司 Pressure reducing valve centrifugal overload test device

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