WO2016093378A1 - Flow rate control device for construction machine - Google Patents

Flow rate control device for construction machine Download PDF

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Publication number
WO2016093378A1
WO2016093378A1 PCT/KR2014/011999 KR2014011999W WO2016093378A1 WO 2016093378 A1 WO2016093378 A1 WO 2016093378A1 KR 2014011999 W KR2014011999 W KR 2014011999W WO 2016093378 A1 WO2016093378 A1 WO 2016093378A1
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Prior art keywords
hydraulic
valve
pressure
pump
flow
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PCT/KR2014/011999
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French (fr)
Korean (ko)
Inventor
박형석
김남건
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
박형석
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Application filed by 볼보 컨스트럭션 이큅먼트 에이비, 박형석 filed Critical 볼보 컨스트럭션 이큅먼트 에이비
Priority to PCT/KR2014/011999 priority Critical patent/WO2016093378A1/en
Publication of WO2016093378A1 publication Critical patent/WO2016093378A1/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
    • 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

Definitions

  • the present invention relates to a flow control device, and more particularly, to a flow control device for a construction machine for recycling the flow rate is released to the working oil tank when a pressure exceeding the set pressure in the working device operated by the operating oil of the hydraulic pump.
  • FIG. 1 is a hydraulic circuit diagram of a flow control device for a construction machine according to the prior art.
  • a first hydraulic pump 1 and a second hydraulic pump 2 are connected to an engine (not shown).
  • a first hydraulic actuator (referred to as an example an arm cylinder) 3 which is driven by the hydraulic oil of the first hydraulic pump 1 to operate a work device (referred to as an arm) as an example is the first hydraulic pump ( Connected to 1).
  • a second hydraulic actuator (referred to as a boom cylinder as an example) 4 which is driven by the hydraulic oil of the second hydraulic pump 2 to operate a work device (referred to as a boom) is the second hydraulic pump ( 2) is connected.
  • (6) (MCV) is provided in the flow path 1a of the first hydraulic pump 1.
  • a second control valve for controlling the hydraulic oil supplied from the second hydraulic pump 2 to the second hydraulic actuator 4 when the pilot pressure is switched by the operation of the second operating lever RCV; 8) is installed in the flow path 2a of the second hydraulic pump 2.
  • a relief valve 10 is installed in the drain passage 9 connecting the oil passage 1a of the first hydraulic pump 1 and the oil passage 2a of the second hydraulic pump 2 to the hydraulic oil tank T.
  • reference numeral 11 denotes the hydraulic fluid of the first and second hydraulic pumps 1 and 2 when the first and second hydraulic levers 5 and 7 are switched by the first and second hydraulic actuators. It is a main control valve MCV including the first and second control valves 6 and 8 supplied to 3 and 4.
  • the flow rate control apparatus of the prior art uses hydraulic oil supplied from the first hydraulic pump 1 when the first control valve 6 is switched by the pilot pressure applied when the first operation lever 5 is operated.
  • the first hydraulic actuator 3 may be driven.
  • the first hydraulic pump 1 is supplied from the first hydraulic pump 1 by the operation of the first operating lever 5.
  • the first hydraulic actuator 3 is driven by hydraulic oil
  • the second hydraulic actuator 4 is driven by the hydraulic oil supplied from the second hydraulic pump 2 by the operation of the second operation lever 7. It can be driven.
  • the arm connected to the first hydraulic pump 1 and the boom connected to the second hydraulic pump 2 are operated so as to exceed the set pressure of the relief valve 10 on the arm during the composite operation.
  • the hydraulic oil discharged from the first hydraulic pump 1 passes through the relief valve 10 and is released to the hydraulic oil tank T. That is, there is a problem that causes energy loss due to unnecessary driving of the first hydraulic pump (1).
  • the present invention is to solve the above-mentioned problems, in the case of a complex operation by operating a work device such as a boom, arm, etc., the other side work device to the flow rate that is relief to the working oil tank when a pressure exceeding the set pressure in one work device
  • the first and second hydraulic pump and pilot pump are configured to achieve the above and other objects of the present invention.
  • a first hydraulic actuator driven by the hydraulic oil of the first hydraulic pump
  • a second hydraulic actuator driven by the hydraulic oil of the second hydraulic pump
  • a first control valve installed in a flow path of the first hydraulic pump and controlling hydraulic oil supplied from the first hydraulic pump to the first hydraulic actuator at the time of switching by operation of the first operating lever;
  • a second control valve installed in a flow path of the second hydraulic pump and controlling hydraulic oil supplied from the second hydraulic pump to the second hydraulic actuator when switching by operation of the second operation lever;
  • a main relief valve installed in the drain flow path connecting the flow path of the first hydraulic pump and the flow path of the second hydraulic pump to the hydraulic oil tank;
  • the main relief valve is installed in the drain flow path between the main relief valve and the hydraulic oil tank, and the main relief valve is set to any one of the first and second hydraulic actuators during the complex operation by driving the first and second hydraulic actuators.
  • a flow rate sharing valve configured to supply a flow rate, which is reliefd from the hydraulic pump connected to the overloaded hydraulic actuator to the hydraulic oil tank, to the other one of the first and second hydraulic actuators. It provides a flow control device for a construction machine, characterized in that.
  • the first hydraulic actuator is any one of a left driving motor, a swing motor and an arm cylinder
  • the second hydraulic actuator is any one of a right driving motor, a boom cylinder and a bucket cylinder.
  • the flow rate of the hydraulic pump connected to any one of the hydraulic actuators in which an overload is generated in excess of the set pressure is transferred to the other one of the first and second hydraulic actuators not overloaded. It is characterized in that the pilot-type control valve is switched on to supply.
  • a selection valve installed in a flow path between the pilot pump and the flow rate sharing valve and configured to apply the hydraulic oil supplied from the pilot pump to the flow rate sharing valve at a pilot pressure when switched to an on state;
  • Electro-proportional pressure reducing valves for generating a pilot pressure corresponding to an electrical signal applied with the hydraulic oil supplied from the pilot pump to apply the generated pilot pressure to the flow sharing valve are used.
  • a first pressure sensor which senses a pilot pressure applied to the first control valve by an operation of the first control lever and outputs a detection signal to the controller
  • a second pressure sensor which detects a pilot pressure applied to the second control valve by operating the second operation lever and outputs a detection signal to the controller
  • the first and second hydraulic pumps are provided with a third and fourth pressure sensors for detecting the occurrence of a pressure exceeding a set pressure and outputting a detection signal to the controller.
  • the controller is in a complex operation by driving the first and second hydraulic actuators by detection signals input from the first and second pressure sensors, and the first and second detection signals are input by detection signals input from the third and fourth pressure sensors.
  • the electrical signal is applied to the selection valve.
  • the check valve installed in the shared flow passage is the flow rate of the hydraulic pump connected to any one of the hydraulic actuator in which the overload occurs exceeding the set pressure of the first and second hydraulic actuators through the shared passage It prevents the flow back flow when it is supplied to the other one of the 1, 2 hydraulic actuator that is not overloaded.
  • FIG. 1 is a hydraulic circuit diagram of a flow control device for a construction machine according to the prior art
  • FIG. 2 is a hydraulic circuit diagram of a flow control device for a construction machine according to a preferred embodiment of the present invention
  • FIG. 3 is a state diagram used in the flow control device for a construction machine according to a preferred embodiment of the present invention.
  • FIG. 2 is a hydraulic circuit diagram of a flow control device for a construction machine according to a preferred embodiment of the present invention
  • Figure 3 is a state diagram of the flow control device for a construction machine according to a preferred embodiment of the present invention.
  • the first and second hydraulic pumps 1 and 2 and the pilot pump 13 are connected to an engine (not shown).
  • a first control valve 6 for controlling the hydraulic oil supplied from the first hydraulic pump 1 to the first hydraulic actuator 3 at the time of switching by the operation of the first operating lever 5 is the first hydraulic pressure. It is provided in the flow path 1a of the pump 1.
  • a second control valve 8 for controlling the hydraulic oil supplied from the second hydraulic pump 2 to the second hydraulic actuator 4 at the time of switching by the operation of the second operation lever 7 is the second hydraulic pressure. It is provided in the flow path 2a of the pump 2.
  • the main relief valve 10 is installed in the drain flow path 9 connecting the flow path 1a of the first hydraulic pump 1 and the flow path 2a of the second hydraulic pump 2 to the hydraulic oil tank T. do.
  • a pressure exceeding a set pressure of the main relief valve 10 is applied to any one of the first and second hydraulic actuators 3 and 4.
  • a flow rate sharing valve for supplying a flow rate relief from the hydraulic pump connected to the overloaded hydraulic actuator to the hydraulic oil tank T to the other of the first and second hydraulic actuators 3 and 4 (12) is installed in the drain passage (9) between the main relief valve (10) and the hydraulic oil tank (T).
  • the first hydraulic actuator 3 is any one of a left driving motor (not shown), a swing motor (not shown), and an arm cylinder, and the second hydraulic actuator 4 is a right driving motor (not shown).
  • a boom cylinder and a bucket cylinder (not shown).
  • the flow sharing valve 12 is
  • the flow rate of the hydraulic pump connected to any one of the first and second hydraulic actuators (3,4) overload the set pressure over the set pressure through the shared flow path 17 through the first and second hydraulic actuator ( Pilot control valves switched on can be used to supply the other of overloads 3 and 4).
  • the hydraulic fluid is installed in the flow path between the pilot pump 13 and the flow sharing valve 12, and the hydraulic oil supplied from the pilot pump 13 when switched to the ON state is supplied to the flow sharing valve 12.
  • a controller 15 for applying an electrical signal to switch the selection valve 14 to an ON state.
  • the selection valve 14 is
  • a solenoid valve switched to an ON state when an electrical signal is applied may be used.
  • the selection valve 14 is
  • An electromagnetic proportional pressure reducing valve for generating a pilot pressure corresponding to an electrical signal applied with the hydraulic oil supplied from the pilot pump 13 to apply the generated pilot pressure to the flow sharing valve 12 may be used.
  • a first pressure sensor (18) which detects a pilot pressure applied to the first control valve (6) by the operation of the first control lever (5) and outputs a detection signal to the controller (15);
  • the first and second hydraulic pumps 1 and 2 are provided with third and fourth pressure sensors 20 and 21 for detecting the occurrence of a pressure exceeding a set pressure and outputting a detection signal to the controller 15.
  • the controller 15 is working in combination by driving the first and second hydraulic actuators 3 and 4 by detection signals input from the first and second pressure sensors 18.19, and the third and fourth pressure sensors.
  • the selection valve An electrical signal can be applied to (14).
  • the flow rate of the hydraulic pump connected to any one of the first and second hydraulic actuators (3,4) overload set pressure is generated through the shared flow path 17, the first and second hydraulic actuator A check valve 16 may be installed in the shared flow path 17 to prevent flow backflow when supplied to the other one of the overloads (3, 4).
  • MCV main control valve
  • the first control valve 6 when the first control valve 6 is switched by the pilot pressure applied when the first operation lever 5 is operated, the first oil is supplied by the hydraulic oil supplied from the first hydraulic pump 1. 1
  • the hydraulic actuator 3 can be driven independently.
  • the pilot pressure applied to the first control valve 6 is sensed by the first pressure sensor 18 to input a detection signal to the controller 15.
  • the hydraulic pressure discharged from the first hydraulic pump 1 by the third pressure sensor 20 and supplied to the first hydraulic actuator 6 is sensed to input a detection signal to the controller 15. .
  • the pilot pressure applied to the second control valve 8 is sensed by the second pressure sensor 19 to input a detection signal to the controller 15.
  • the fourth pressure sensor 21 is discharged from the second hydraulic pump 2 to detect the hydraulic oil pressure supplied to the second hydraulic actuator 4 to input the detection signal to the controller 15. .
  • the first hydraulic actuator 3 is driven independently by the hydraulic oil supplied from the first hydraulic pump 1 by the operation of the first operating lever 5, and the second operating lever 7 is operated.
  • the second hydraulic pump (2) By operating the second hydraulic pump (2) by the operation of the second hydraulic actuator 4 can be driven independently.
  • the main relief valve may be connected to a work device (for example, an arm) connected to the first hydraulic actuator 3, or a work device (for example, a boom) connected to the second hydraulic actuator 4.
  • a work device for example, an arm
  • a work device for example, a boom
  • the hydraulic fluid discharged from the first hydraulic pump 1 or the second hydraulic pump 2 passes through the main relief valve 10 to the drain flow path 9, Passed through the flow sharing valve 12 to maintain the initial state is relief to the hydraulic oil tank (T).
  • the check valve 14 since the electrical signal is not applied to the check valve 14 from the controller 15, the check valve 14 is the initial state that the opening is opened by the elastic force of the valve spring (pilot pump ( 13) to prevent the hydraulic oil from being applied to the flow sharing valve 12 at a pilot pressure. That is, since the signal pressure port of the flow sharing valve 12 is connected to the hydraulic oil tank T by the check valve 14, the flow sharing valve 12 can maintain the initial state.
  • the first and second hydraulic actuators 3 and 4 may be checked by the detection signals detected by the first and second pressure sensors 18 and 19 and input to the controller 15.
  • the load pressure generated in the first and second hydraulic actuators 3 and 4 by the detection signals input by the third and fourth pressure sensors 20 and 21 and input to the controller 15 may be checked. do.
  • the work device connected to the first hydraulic actuator 3 by the detection signal input from the first and second pressure sensors 18 and 19 to the controller 15 and the second hydraulic actuator 4. You can confirm that you are working in the complex by operating the connected work device.
  • the first and second hydraulic actuators 3 and 4 are driven to perform a combined operation, and the working device connected to the second hydraulic actuator 4 exceeds the set pressure of the main relief valve 10.
  • the hydraulic fluid of the second hydraulic pump 2 passes through the main relief valve 10, the flow sharing valve 12, and the check valve 16 installed in the shared flow path 17 to the first hydraulic pump. It is supplied to the flow path 1a of the hydraulic pump 1. As a result, the hydraulic oil discharged from the first hydraulic pump 1 can be joined.
  • the first and second hydraulic actuators 3 and 4 are driven by the detection signals of the first and second pressure sensors 18 and 19 to perform the combined operation, and the third and fourth pressure sensors 20 and 21 are used.
  • No electrical signal is applied to the selection valve 14 from 15).
  • the hydraulic oil of the first and second hydraulic pumps 1 and 2 passes through the main relief valve 10 and the flow sharing valve 12 installed in the drain passage 9 to be released into the hydraulic oil tank T. .
  • the effect of being able to reuse the flow rate that is released to the hydraulic oil tank when a pressure exceeding the set pressure in the working device, such as the boom, arm, bucket of the excavator operated by the hydraulic oil of the hydraulic pump have.

Abstract

Disclosed is a hydraulic power circuit for recycling a flow which is relieved to an operating oil tank when a pressure exceeding a preset pressure occurs at an operating apparatus operating by means of the hydraulic fluid of a hydraulic pump. A hydraulic power circuit for a construction machine according to the present invention comprises: first and second hydraulic pumps and a pilot pump; a first hydraulic actuator which is driven by the hydraulic fluid of the first hydraulic pump; a second hydraulic actuator which is driven by the hydraulic fluid of the second hydraulic pump; first and second operation levers; a first control valve for controlling hydraulic fluid which is supplied from the first hydraulic pump to the second hydraulic actuator at the time of switching; a second control valve for controlling hydraulic fluid which is supplied from the second hydraulic pump to the second hydraulic actuator at the time of switching; a main relief valve which is installed in the flow path of the first hydraulic pump and in a drain flow path which connects the flow path of the second hydraulic pump to the operating oil tank; and a flow sharing valve installed in the drain flow path between the main relief valve and the operating oil tank.

Description

건설기계용 유량 제어장치Flow control device for construction machinery
본 발명은 유량 제어장치에 관한 것으로, 특히 유압펌프의 작동유에 의해 동작하는 작업장치에 설정압력을 초과하는 압력 발생시 작동유탱크로 릴리프되는 유량을 재활용하기 위한 건설기계용 유량 제어장치에 관한 것이다.The present invention relates to a flow control device, and more particularly, to a flow control device for a construction machine for recycling the flow rate is released to the working oil tank when a pressure exceeding the set pressure in the working device operated by the operating oil of the hydraulic pump.
도 1은 종래 기술에 의한 건설기계용 유량 제어장치의 유압회로도이다.1 is a hydraulic circuit diagram of a flow control device for a construction machine according to the prior art.
도 1에 도시한 바와 같이, 제1유압펌프(1) 및 제2유압펌프(2)가 엔진(미도시됨)에 연결된다. 상기 제1유압펌프(1)의 작동유에 의해 구동되어 작업장치(일 예로서 아암을 말함)를 동작시키는 제1유압액츄에이터(일 예로서 아암실린더를 말함)(3)가 상기 제1유압펌프(1)에 연결된다. 상기 제2유압펌프(2)의 작동유에 의해 구동되어 작업장치(일 예로서 붐을 말함)를 동작시키는 제2유압액츄에이터(일 예로서 붐실린더를 말함)(4)가 상기 제2유압펌프(2)에 연결된다.As shown in FIG. 1, a first hydraulic pump 1 and a second hydraulic pump 2 are connected to an engine (not shown). A first hydraulic actuator (referred to as an example an arm cylinder) 3 which is driven by the hydraulic oil of the first hydraulic pump 1 to operate a work device (referred to as an arm) as an example is the first hydraulic pump ( Connected to 1). A second hydraulic actuator (referred to as a boom cylinder as an example) 4 which is driven by the hydraulic oil of the second hydraulic pump 2 to operate a work device (referred to as a boom) is the second hydraulic pump ( 2) is connected.
제1조작레버(RCV)(5)의 조작에 의한 파일럿압력 인가시 절환되는 경우, 상기 제1유압펌프(1)로부터 상기 제1유압액츄에이터(3)에 공급되는 작동유를 제어하는 제1컨트롤밸브(6)(MCV)가 상기 제1유압펌프(1)의 유로(1a)에 설치된다.The first control valve for controlling the hydraulic oil supplied from the first hydraulic pump 1 to the first hydraulic actuator 3 when the pilot pressure is switched by the operation of the first operating lever (RCV) (5). (6) (MCV) is provided in the flow path 1a of the first hydraulic pump 1.
제2조작레버(RCV)(7)의 조작에 의한 파일럿압력 인가시 절환되는 경우, 상기 제2유압펌프(2)로부터 제2유압액츄에이터(4)에 공급되는 작동유를 제어하는 제2컨트롤밸브(8)가 상기 제2유압펌프(2)의 유로(2a)에 설치된다.A second control valve for controlling the hydraulic oil supplied from the second hydraulic pump 2 to the second hydraulic actuator 4 when the pilot pressure is switched by the operation of the second operating lever RCV; 8) is installed in the flow path 2a of the second hydraulic pump 2.
제1유압펌프(1)의 유로(1a) 및 상기 제2유압펌프(2)의 유로(2a)를 작동유탱크(T)에 연결하는 드레인유로(9)에 릴리프밸브(10)가 설치된다.A relief valve 10 is installed in the drain passage 9 connecting the oil passage 1a of the first hydraulic pump 1 and the oil passage 2a of the second hydraulic pump 2 to the hydraulic oil tank T.
도면중 미 설명부호 11은 상기 제1,2조작레버(5,7)의 조작에 의해 절환될 경우, 상기 제1,2유압펌프(1,2)의 작동유를 상기 제1,2유압액츄에이터(3,4)에 공급하는 제1,2컨트롤밸브(6,8)를 포함하는 메인 컨트롤밸브(MCV)이다.In the drawing, reference numeral 11 denotes the hydraulic fluid of the first and second hydraulic pumps 1 and 2 when the first and second hydraulic levers 5 and 7 are switched by the first and second hydraulic actuators. It is a main control valve MCV including the first and second control valves 6 and 8 supplied to 3 and 4.
종래 기술의 유량 제어장치는, 상기 제1조작레버(5)를 조작시 인가되는 파일럿압력에 의해 제1컨트롤밸브(6)를 절환시킬 경우 상기 제1유압펌프(1)로부터 공급되는 작동유에 의해 상기 제1유압액츄에이터(3)를 구동시킬 수 있다.The flow rate control apparatus of the prior art uses hydraulic oil supplied from the first hydraulic pump 1 when the first control valve 6 is switched by the pilot pressure applied when the first operation lever 5 is operated. The first hydraulic actuator 3 may be driven.
상기 제2조작레버(7)를 조작시 인가되는 파일럿압력에 의해 제2컨트롤밸브(8)를 절환시킬 경우 상기 제2유압펌프(2)로부터 공급되는 작동유에 의해 상기 제2유압액츄에이터(4)를 구동시킬 수 있다.When the second control valve 8 is switched by the pilot pressure applied when the second operation lever 7 is operated, the second hydraulic actuator 4 is provided by the working oil supplied from the second hydraulic pump 2. Can be driven.
전술한 바와 같이 상기 제1유압액츄에이터(3) 또는 상기 제2유압액츄에이터(4)를 단독 구동시킬 경우에, 상기 제1조작레버(5)의 조작에 의해 제1유압펌프(1)로부터 공급되는 작동유에 의해 상기 제1유압액츄에이터(3)를 구동시키고, 상기 제2조작레버(7)의 조작에 의해 상기 제2유압펌프(2)로부터 공급되는 작동유에 의해 상기 제2유압액츄에이터(4)를 구동시킬 수 있게 된다.As described above, when driving the first hydraulic actuator 3 or the second hydraulic actuator 4 alone, the first hydraulic pump 1 is supplied from the first hydraulic pump 1 by the operation of the first operating lever 5. The first hydraulic actuator 3 is driven by hydraulic oil, and the second hydraulic actuator 4 is driven by the hydraulic oil supplied from the second hydraulic pump 2 by the operation of the second operation lever 7. It can be driven.
한편, 상기 제1조작레버(5)를 조작시 상기 제1유압액츄에이터(3)의 구동에 의해 상기 아암을 동작시켜 작업하는 도중 상기 아암에 상기 릴리프밸브(10)의 설정압력을 초과하는 부하가 발생되고, 동시에 상기 제2조작레버(7)를 조작시 상기 제2유압액츄에이터(4)의 구동에 의해 상기 붐을 동작시켜 작업할 경우, 상기 제1유압펌프(1)로부터 토출되는 작동유는 상기 제1유압펌프(1)의 유로(1a) 및 상기 릴리프밸브(10)를 차례로 통과하여 작동유탱크(T)로 릴리프되는 동작을 반복하게 된다.On the other hand, while operating the arm by operating the first hydraulic actuator 3 when operating the first operation lever 5, the load exceeding the set pressure of the relief valve 10 to the arm during operation The hydraulic fluid discharged from the first hydraulic pump 1 is generated when the second boom is operated by operating the second hydraulic actuator 4 when the second operation lever 7 is operated. Repetitively passing through the flow path (1a) and the relief valve 10 of the first hydraulic pump 1 to the hydraulic oil tank (T) is repeated.
전술한 바와 같이 상기 제1유압펌프(1)에 연결되는 아암과 상기 제2유압펌프(2)에 연결되는 붐을 동작시켜 복합 작업하는 도중에 상기 아암에 상기 릴리프밸브(10)의 설정압력을 초과하는 부하가 발생되는 경우, 상기 제1유압펌프(1)로부터 토출되는 작동유가 상기 릴리프밸브(10)를 통과하여 작동유탱크(T)로 릴리프된다. 즉 상기 제1유압펌프(1)의 불필요한 구동으로 인해 에너지 손실을 초래하게 되는 문제점을 갖는다.As described above, the arm connected to the first hydraulic pump 1 and the boom connected to the second hydraulic pump 2 are operated so as to exceed the set pressure of the relief valve 10 on the arm during the composite operation. When a load is generated, the hydraulic oil discharged from the first hydraulic pump 1 passes through the relief valve 10 and is released to the hydraulic oil tank T. That is, there is a problem that causes energy loss due to unnecessary driving of the first hydraulic pump (1).
따라서, 본 발명은 전술한 문제점을 해결하고자 하는 것으로, 붐, 아암등의 작업장치를 동작시켜 복합작업하는 경우, 일측 작업장치에 설정압력을 초과하는 압력 발생시 작동유탱크로 릴리프되는 유량을 타측 작업장치 동작에 보충함에 따라 에너지 낭비를 방지하고, 작업장치 구동속도를 확보하여 작업성을 향상시킬 수 있도록 한 건설기계용 유량 제어장치를 제공하는 것을 목적으로 한다.Therefore, the present invention is to solve the above-mentioned problems, in the case of a complex operation by operating a work device such as a boom, arm, etc., the other side work device to the flow rate that is relief to the working oil tank when a pressure exceeding the set pressure in one work device It is an object of the present invention to provide a flow rate control device for construction machinery that prevents energy waste and improves workability by securing a working device driving speed.
상기 및 기타 본 발명의 목적을 달성하기 위하여 본 발명의 일 실시예에 따르면, 제1,2유압펌프 및 파일럿펌프;According to an embodiment of the present invention to achieve the above and other objects of the present invention, the first and second hydraulic pump and pilot pump;
상기 제1유압펌프의 작동유에 의해 구동하는 제1유압액츄에이터;A first hydraulic actuator driven by the hydraulic oil of the first hydraulic pump;
상기 제2유압펌프의 작동유에 의해 구동하는 제2유압액츄에이터;A second hydraulic actuator driven by the hydraulic oil of the second hydraulic pump;
조작량에 대응되는 파일럿압력을 출력하는 제1,2조작레버;First and second operation levers outputting pilot pressure corresponding to the operation amount;
상기 제1유압펌프의 유로에 설치되고, 상기 제1조작레버의 조작에 의해 절환시 상기 제1유압펌프로부터 상기 제1유압액츄에이터에 공급되는 작동유를 제어하는 제1컨트롤밸브;A first control valve installed in a flow path of the first hydraulic pump and controlling hydraulic oil supplied from the first hydraulic pump to the first hydraulic actuator at the time of switching by operation of the first operating lever;
상기 제2유압펌프의 유로에 설치되고, 상기 제2조작레버의 조작에 의해 절환시 상기 제2유압펌프로부터 상기 제2유압액츄에이터에 공급되는 작동유를 제어하는 제2컨트롤밸브;A second control valve installed in a flow path of the second hydraulic pump and controlling hydraulic oil supplied from the second hydraulic pump to the second hydraulic actuator when switching by operation of the second operation lever;
상기 제1유압펌프의 유로 및 상기 제2유압펌프의 유로를 작동유탱크에 연결하는 드레인유로에 설치되는 메인 릴리프밸브;A main relief valve installed in the drain flow path connecting the flow path of the first hydraulic pump and the flow path of the second hydraulic pump to the hydraulic oil tank;
상기 메인 릴리프밸브와 상기 작동유탱크사이의 상기 드레인유로에 설치되고, 상기 제1,2유압액츄에터를 구동시켜 복합 작업하는 도중에 상기 제1,2유압액츄에이터 중 어느 하나에 상기 메인 릴리프밸브의 설정압력을 초과하는 과부하가 발생되는 경우, 과부하가 발생되는 유압액츄에이터에 연결되는 유압펌프로부터 작동유탱크로 릴리프되는 유량을 상기 제1,2유압액츄에이터 중 다른 하나에 공급하게 되는 유량공유밸브;를 구비하는 것을 특징으로 하는 건설기계용 유량 제어장치를 제공한다.The main relief valve is installed in the drain flow path between the main relief valve and the hydraulic oil tank, and the main relief valve is set to any one of the first and second hydraulic actuators during the complex operation by driving the first and second hydraulic actuators. And a flow rate sharing valve configured to supply a flow rate, which is reliefd from the hydraulic pump connected to the overloaded hydraulic actuator to the hydraulic oil tank, to the other one of the first and second hydraulic actuators. It provides a flow control device for a construction machine, characterized in that.
상기 제1유압액츄에이터는 좌측 주행모터, 스윙모터 및 아암실린더 중 어느 하나이고, 상기 제2유압액츄에이터는 우측 주행모터, 붐실린더 및 버킷실린더 중 어느 하나인 것을 특징으로 한다.The first hydraulic actuator is any one of a left driving motor, a swing motor and an arm cylinder, and the second hydraulic actuator is any one of a right driving motor, a boom cylinder and a bucket cylinder.
상기 유량공유밸브는The flow sharing valve
상기 제1유압액츄에이터와 상기 제2유압액츄에이터 중 어느 하나에 상기 메인 릴리프밸브의 설정압력을 초과하는 압력 발생시 작동유를 상기 작동유탱크로 릴리프시키는 초기상태와,An initial state in which one of the first hydraulic actuator and the second hydraulic actuator reliefs hydraulic fluid to the hydraulic oil tank when a pressure exceeding a set pressure of the main relief valve is generated;
상기 제1,2유압액츄에이터 중 설정압력을 초과하여 과부하가 발생되는 어느 하나의 유압액츄에이터에 연결되는 유압펌프의 유량을 공유유로를 통해 상기 제1,2유압액츄에이터 중 과부하가 발생되지않은 다른 하나에 공급하기 위해 온 상태로 절환되는 파일럿형제어밸브인 것을 특징으로 한다.Among the first and second hydraulic actuators, the flow rate of the hydraulic pump connected to any one of the hydraulic actuators in which an overload is generated in excess of the set pressure is transferred to the other one of the first and second hydraulic actuators not overloaded. It is characterized in that the pilot-type control valve is switched on to supply.
상기 파일럿펌프와 상기 유량공유밸브사이의 유로에 설치되고, 온 상태로 절환시 상기 파일럿펌프로부터 공급되는 작동유를 상기 유량공유밸브에 파일럿압력으로 인가시키는 선택밸브;A selection valve installed in a flow path between the pilot pump and the flow rate sharing valve and configured to apply the hydraulic oil supplied from the pilot pump to the flow rate sharing valve at a pilot pressure when switched to an on state;
상기 선택밸브를 온 상태로 절환시키기 위해 전기적신호를 인가시키는 콘트롤러;를 구비하는 것을 특징으로 한다.And a controller for applying an electrical signal to switch the selection valve to an on state.
상기 선택밸브는The selector valve
상기 유량공유밸브의 신호압포트를 상기 작동유탱크에 연결하는 초기상태와,An initial state of connecting the signal pressure port of the flow sharing valve to the hydraulic oil tank;
상기 유량공유밸브에 파일럿압력을 인가시켜 절환시키기 위해 전기적신호 인가시 온 상태로 절환되는 솔레노이드밸브가 사용되는 것을 특징으로 한다.In order to switch by applying a pilot pressure to the flow sharing valve is characterized in that the solenoid valve is switched to the on state when the electrical signal is applied.
상기 선택밸브는The selector valve
상기 파일럿펌프로부터 공급되는 작동유를 인가되는 전기적신호에 대응되게 파일럿압력을 생성하여 상기 유량공유밸브에 생성된 파일럿압력을 인가시키는 전자비례감압밸브가 사용되는 것을 특징으로 한다.Electro-proportional pressure reducing valves for generating a pilot pressure corresponding to an electrical signal applied with the hydraulic oil supplied from the pilot pump to apply the generated pilot pressure to the flow sharing valve are used.
상기 제1조작레버의 조작에 의해 상기 제1컨트롤밸브에 인가되는 파일럿압력을 감지하여 상기 콘트롤러에 검출신호를 출력하는 제1압력센서;A first pressure sensor which senses a pilot pressure applied to the first control valve by an operation of the first control lever and outputs a detection signal to the controller;
상기 제2조작레버의 조작에 의해 상기 제2컨트롤밸브에 인가되는 파일럿압력을 감지하여 상기 콘트롤러에 검출신호를 출력하는 제2압력센서;A second pressure sensor which detects a pilot pressure applied to the second control valve by operating the second operation lever and outputs a detection signal to the controller;
상기 제1,2유압펌프에 설정압력을 초과하는 압력 발생되는 것을 감지하여 상기 콘트롤러에 검출신호를 출력하는 제3,4압력센서를 구비하여,The first and second hydraulic pumps are provided with a third and fourth pressure sensors for detecting the occurrence of a pressure exceeding a set pressure and outputting a detection signal to the controller.
상기 콘트롤러는 상기 제1,2압력센서로부터 입력되는 검출신호에 의해 상기 제1,2유압액츄에이터의 구동에 의해 복합 작업 중이고, 상기 제3,4압력센서로부터입력되는 검출신호에 의해 상기 제1,2유압액츄에이터 중 어느 하나에 상기 메인 릴리프밸브의 설정압력을 초과하는 압력이 발생되는 경우, 상기 선택밸브에 전기적신호를 인가시키는 것을 특징으로 한다.The controller is in a complex operation by driving the first and second hydraulic actuators by detection signals input from the first and second pressure sensors, and the first and second detection signals are input by detection signals input from the third and fourth pressure sensors. When a pressure exceeding the set pressure of the main relief valve is generated in any one of the two hydraulic actuators, it is characterized in that the electrical signal is applied to the selection valve.
상기 공유유로에 설치되는 체크밸브, 상기 체크밸브는 상기 제1,2유압액츄에이터 중 설정압력을 초과하여 과부하가 발생되는 어느 하나의 유압액츄에이터에 연결되는 유압펌프의 유량을 상기 공유유로를 통해 상기 제1,2유압액츄에이터 중 과부하가 발생되지않은 다른 하나에 공급시킬 경우 유량 역류되는 것을 방지시킴;을 특징으로 한다.The check valve installed in the shared flow passage, the check valve is the flow rate of the hydraulic pump connected to any one of the hydraulic actuator in which the overload occurs exceeding the set pressure of the first and second hydraulic actuators through the shared passage It prevents the flow back flow when it is supplied to the other one of the 1, 2 hydraulic actuator that is not overloaded.
전술한 구성을 갖는 본 발명에 따르면, 붐, 아암등의 작업장치를 동작시켜 복합작업하는 경우, 일측 작업장치에 설정압력을 초과하는 압력 발생시 작동유탱크로 릴리프되는 유량을 타측 작업장치 동작에 사용함에 따라 에너지 낭비를 방지하고, 작업장치 구동속도를 확보하여 작업성을 향상시킬 수 있는 효과가 있다.According to the present invention having the above-described configuration, in the case of complex work by operating a work device such as a boom, arm, etc., to use the flow rate that is relief to the working oil tank when the pressure exceeding the set pressure in one work device for the other work device operation Accordingly, there is an effect of preventing energy waste and improving workability by securing a work device driving speed.
도 1은 종래 기술에 의한 건설기계용 유량 제어장치의 유압회로도,1 is a hydraulic circuit diagram of a flow control device for a construction machine according to the prior art,
도 2는 본 발명의 바람직한 실시예에 의한 건설기계용 유량 제어장치의 유압회로도,2 is a hydraulic circuit diagram of a flow control device for a construction machine according to a preferred embodiment of the present invention;
도 3은 본 발명의 바람직한 실시예에 의한 건설기계용 유량 제어장치의 사용상태도이다.3 is a state diagram used in the flow control device for a construction machine according to a preferred embodiment of the present invention.
〈도면의 주요 부분에 대한 참조 부호의 설명〉<Explanation of reference numerals for the main parts of the drawings>
1; 제1유압펌프One; 1st hydraulic pump
2; 제2유압펌프2; 2nd hydraulic pump
3; 제1유압액츄에이터3; 1st hydraulic actuator
4; 제2유압액츄에이터4; 2nd hydraulic actuator
5; 제1조작레버5; 1st operation lever
6; 제1컨트롤밸브6; 1st control valve
7; 제2조작레버7; 2nd operation lever
8; 제2컨트롤밸브8; Second Control Valve
9; 드레인유로9; Drain euro
10; 메인 릴리프밸브10; Main relief valve
11; 메인 컨트롤밸브(MCV)11; Main control valve (MCV)
12; 유량공유밸브12; Flow sharing valve
13; 파일럿펌프13; Pilot pump
14; 선택밸브14; Selector valve
15; 콘트롤러15; Controller
16; 체크밸브16; Check valve
17; 공유유로17; Euro
18; 제1압력센서18; 1st pressure sensor
19; 제2압력센서19; Second pressure sensor
20; 제3압력센서20; 3rd pressure sensor
21; 제4압력센서21; 4th pressure sensor
이하, 첨부도면을 참조하여 본 발명의 바람직한 실시예에 따른 건설기계용 유량 제어장치를 상세히 설명하기로 한다.Hereinafter, a flow control device for a construction machine according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.
도 2는 본 발명의 바람직한 실시예에 의한 건설기계용 유량 제어장치의 유압회로도이고, 도 3은 본 발명의 바람직한 실시예에 의한 건설기계용 유량 제어장치의 사용상태도이다.2 is a hydraulic circuit diagram of a flow control device for a construction machine according to a preferred embodiment of the present invention, Figure 3 is a state diagram of the flow control device for a construction machine according to a preferred embodiment of the present invention.
도 2 및 도 3에 도시된 본 발명의 일 실시예에 따른 건설기계용 유량 제어장치는,2 and 3, the flow control device for a construction machine according to an embodiment of the present invention,
제1,2유압펌프(1,2) 및 파일럿펌프(13)가 엔진(미도시됨)에 연결된다.The first and second hydraulic pumps 1 and 2 and the pilot pump 13 are connected to an engine (not shown).
상기 제1유압펌프(1)의 작동유에 의해 구동되어 작업장치(일 예로서 아암을 말함)를 동작시키는 제1유압액츄에이터(일 예로서 아암실린더를 말함)(3)가 상기 제1유압펌프(1)에 설치된다.A first hydraulic actuator (referred to as an example an arm cylinder) 3 which is driven by the hydraulic oil of the first hydraulic pump 1 to operate a work device (referred to as an arm) as an example is the first hydraulic pump ( 1) is installed.
상기 제2유압펌프(2)의 작동유에 의해 구동되어 작업장치(일 예로서 붐을 말함)를 동작시키는 제2유압액츄에이터(일 예로서 붐실린더를 말함)(4)가 상기 제2유압펌프(2)에 설치된다.A second hydraulic actuator (referred to as a boom cylinder as an example) 4 which is driven by the hydraulic oil of the second hydraulic pump 2 to operate a work device (referred to as a boom) is the second hydraulic pump ( 2) is installed.
상기 제1조작레버(5)의 조작에 의해 절환시 상기 제1유압펌프(1)로부터 상기 제1유압액츄에이터(3)에 공급되는 작동유를 제어하는 제1컨트롤밸브(6)가 상기 제1유압펌프(1)의 유로(1a)에 설치된다.A first control valve 6 for controlling the hydraulic oil supplied from the first hydraulic pump 1 to the first hydraulic actuator 3 at the time of switching by the operation of the first operating lever 5 is the first hydraulic pressure. It is provided in the flow path 1a of the pump 1.
상기 제2조작레버(7)의 조작에 의해 절환시 상기 제2유압펌프(2)로부터 상기 제2유압액츄에이터(4)에 공급되는 작동유를 제어하는 제2컨트롤밸브(8)가 상기 제2유압펌프(2)의 유로(2a)에 설치된다.A second control valve 8 for controlling the hydraulic oil supplied from the second hydraulic pump 2 to the second hydraulic actuator 4 at the time of switching by the operation of the second operation lever 7 is the second hydraulic pressure. It is provided in the flow path 2a of the pump 2.
상기 제1유압펌프(1)의 유로(1a) 및 상기 제2유압펌프(2)의 유로(2a)를 작동유탱크(T)에 연결하는 드레인유로(9)에 메인 릴리프밸브(10)가 설치된다.The main relief valve 10 is installed in the drain flow path 9 connecting the flow path 1a of the first hydraulic pump 1 and the flow path 2a of the second hydraulic pump 2 to the hydraulic oil tank T. do.
상기 제1,2유압액츄에터(3,4)를 구동시켜 복합 작업하는 도중에 상기 제1,2유압액츄에이터(3,4) 중 어느 하나에 상기 메인 릴리프밸브(10)의 설정압력을 초과하는 과부하가 발생되는 경우, 과부하가 발생되는 유압액츄에이터에 연결되는 유압펌프로부터 작동유탱크(T)로 릴리프되는 유량을 상기 제1,2유압액츄에이터(3,4) 중 다른 하나에 공급하기 위한 유량공유밸브(12)가 상기 메인 릴리프밸브(10)와 상기 작동유탱크(T)사이의 상기 드레인유로(9)에 설치된다.During the operation of driving the first and second hydraulic actuators 3 and 4, a pressure exceeding a set pressure of the main relief valve 10 is applied to any one of the first and second hydraulic actuators 3 and 4. In the event of an overload, a flow rate sharing valve for supplying a flow rate relief from the hydraulic pump connected to the overloaded hydraulic actuator to the hydraulic oil tank T to the other of the first and second hydraulic actuators 3 and 4 (12) is installed in the drain passage (9) between the main relief valve (10) and the hydraulic oil tank (T).
상기 제1유압액츄에이터(3)는 좌측 주행모터(미도시됨), 스윙모터(미도시됨) 및 아암실린더 중 어느 하나이고, 상기 제2유압액츄에이터(4)는 우측 주행모터(미도시됨), 붐실린더 및 버킷실린더(미도시됨) 중 어느 하나일 수 있다.The first hydraulic actuator 3 is any one of a left driving motor (not shown), a swing motor (not shown), and an arm cylinder, and the second hydraulic actuator 4 is a right driving motor (not shown). , A boom cylinder and a bucket cylinder (not shown).
상기 유량공유밸브(12)는The flow sharing valve 12 is
상기 제1,2유압액츄에이터(3,4) 중 어느 하나에 상기 메인 릴리프밸브(10)의 설정압력을 초과하는 압력 발생시 작동유를 상기 작동유탱크(T)로 릴리프시키는 초기상태와,An initial state in which one of the first and second hydraulic actuators 3 and 4 reliefs the hydraulic fluid to the hydraulic oil tank T when a pressure exceeding a set pressure of the main relief valve 10 is generated;
상기 제1,2유압액츄에이터(3,4) 중 설정압력을 초과하여 과부하가 발생되는 어느 하나의 유압액츄에이터에 연결되는 유압펌프의 유량을 공유유로(17)를 통해 상기 제1,2유압액츄에이터(3,4) 중 과부하가 발생되지않은 다른 하나에 공급하기 위해 온(ON) 상태로 절환되는 파일럿형제어밸브가 사용될 수 있다.The flow rate of the hydraulic pump connected to any one of the first and second hydraulic actuators (3,4) overload the set pressure over the set pressure through the shared flow path 17 through the first and second hydraulic actuator ( Pilot control valves switched on can be used to supply the other of overloads 3 and 4).
상기 파일럿펌프(13)와 상기 유량공유밸브(12)사이의 유로에 설치되고, 온(ON) 상태로 절환시 상기 파일럿펌프(13)로부터 공급되는 작동유를 상기 유량공유밸브(12)에 파일럿압력으로 인가시키는 선택밸브(14);The hydraulic fluid is installed in the flow path between the pilot pump 13 and the flow sharing valve 12, and the hydraulic oil supplied from the pilot pump 13 when switched to the ON state is supplied to the flow sharing valve 12. A selection valve 14 to be applied thereto;
상기 선택밸브(14)를 온(ON) 상태로 절환시키기 위해 전기적신호를 인가시키는 콘트롤러(15);를 구비할 수 있다.And a controller 15 for applying an electrical signal to switch the selection valve 14 to an ON state.
상기 선택밸브(14)는The selection valve 14 is
상기 유량공유밸브(12)의 신호압포트를 상기 작동유탱크(T)에 연결하는 초기상태와,An initial state of connecting the signal pressure port of the flow sharing valve 12 to the hydraulic oil tank T;
상기 유량공유밸브(12)에 파일럿압력을 인가시켜 절환시키기 위해 전기적신호 인가시 온(ON) 상태로 절환되는 솔레노이드밸브가 사용될 수 있다.In order to switch by applying a pilot pressure to the flow sharing valve 12, a solenoid valve switched to an ON state when an electrical signal is applied may be used.
상기 선택밸브(14)는The selection valve 14 is
상기 파일럿펌프(13)로부터 공급되는 작동유를 인가되는 전기적신호에 대응되게 파일럿압력을 생성하여 상기 유량공유밸브(12)에 생성된 파일럿압력을 인가시키는 전자비례감압밸브(PPRV)가 사용될 수 있다.An electromagnetic proportional pressure reducing valve (PPRV) for generating a pilot pressure corresponding to an electrical signal applied with the hydraulic oil supplied from the pilot pump 13 to apply the generated pilot pressure to the flow sharing valve 12 may be used.
상기 제1조작레버(5)의 조작에 의해 상기 제1컨트롤밸브(6)에 인가되는 파일럿압력을 감지하여 상기 콘트롤러(15)에 검출신호를 출력하는 제1압력센서(18);A first pressure sensor (18) which detects a pilot pressure applied to the first control valve (6) by the operation of the first control lever (5) and outputs a detection signal to the controller (15);
상기 제2조작레버(7)의 조작에 의해 상기 제2컨트롤밸브(8)에 인가되는 파일럿압력을 감지하여 상기 콘트롤러(15)에 검출신호를 출력하는 제2압력센서(19);A second pressure sensor (19) for detecting a pilot pressure applied to the second control valve (8) by the operation of the second operation lever (7) and outputting a detection signal to the controller (15);
상기 제1,2유압펌프(1,2)에 설정압력을 초과하는 압력 발생되는 것을 감지하여 상기 콘트롤러(15)에 검출신호를 출력하는 제3,4압력센서(20,21)를 구비하여,The first and second hydraulic pumps 1 and 2 are provided with third and fourth pressure sensors 20 and 21 for detecting the occurrence of a pressure exceeding a set pressure and outputting a detection signal to the controller 15.
상기 콘트롤러(15)는 상기 제1,2압력센서(18.19)로부터 입력되는 검출신호에 의해 상기 제1,2유압액츄에이터(3,4)의 구동에 의해 복합 작업 중이고, 상기 제3,4압력센서(20,21)로부터 입력되는 검출신호에 의해 상기 제1,2유압액츄에이터(3,4) 중 어느 하나에 상기 메인 릴리프밸브(10)의 설정압력을 초과하는 압력이 발생되는 경우, 상기 선택밸브(14)에 전기적신호를 인가시킬 수 있다.The controller 15 is working in combination by driving the first and second hydraulic actuators 3 and 4 by detection signals input from the first and second pressure sensors 18.19, and the third and fourth pressure sensors. When the pressure exceeding the set pressure of the main relief valve 10 is generated in any one of the first and second hydraulic actuators 3 and 4 by the detection signal input from (20, 21), the selection valve An electrical signal can be applied to (14).
상기 제1,2유압액츄에이터(3,4) 중 설정압력을 초과하여 과부하가 발생되는 어느 하나의 유압액츄에이터에 연결되는 유압펌프의 유량을 상기 공유유로(17)를 통해 상기 제1,2유압액츄에이터(3,4) 중 과부하가 발생되지않은 다른 하나에 공급시킬 경우 유량 역류되는 것을 방지시키기 위한 체크밸브(16)가 상기 공유유로(17)에 설치될 수 있다.The flow rate of the hydraulic pump connected to any one of the first and second hydraulic actuators (3,4) overload set pressure is generated through the shared flow path 17, the first and second hydraulic actuator A check valve 16 may be installed in the shared flow path 17 to prevent flow backflow when supplied to the other one of the overloads (3, 4).
도면중 11은 메인 컨트롤밸브(MCV)이다.11 in the figure is the main control valve (MCV).
전술한 구성에 따르면, 상기 제1조작레버(5)를 조작시 인가되는 파일럿압력에 의해 제1컨트롤밸브(6)를 절환시킬 경우 상기 제1유압펌프(1)로부터 공급되는 작동유에 의해 상기 제1유압액츄에이터(3)를 단독 구동시킬 수 있다.According to the above configuration, when the first control valve 6 is switched by the pilot pressure applied when the first operation lever 5 is operated, the first oil is supplied by the hydraulic oil supplied from the first hydraulic pump 1. 1 The hydraulic actuator 3 can be driven independently.
이때, 상기 제1압력센서(18)에 의해 상기 제1컨트롤밸브(6)에 인가되는 파일럿압력을 감지하여 검출신호를 상기 콘트롤러(15)에 입력하게 된다. 또한 상기 제3압력센서(20)에 의해 상기 제1유압펌프(1)로부터 토출되어 상기 제1유압액츄에이터(6)에 공급되는 작동유 압력을 감지하여 검출신호를 상기 콘트롤러(15)에 입력하게 된다.At this time, the pilot pressure applied to the first control valve 6 is sensed by the first pressure sensor 18 to input a detection signal to the controller 15. In addition, the hydraulic pressure discharged from the first hydraulic pump 1 by the third pressure sensor 20 and supplied to the first hydraulic actuator 6 is sensed to input a detection signal to the controller 15. .
한편, 상기 제2조작레버(7)를 조작시 인가되는 파일럿압력에 의해 제2컨트롤밸브(8)를 절환시킬 경우 상기 제2유압펌프(2)로부터 공급되는 작동유에 의해 상기 제2유압액츄에이터(4)를 단독 구동시킬 수 있다.On the other hand, when the second control valve 8 is switched by the pilot pressure applied when operating the second operation lever (7) by the operating oil supplied from the second hydraulic pump (2) the second hydraulic actuator ( 4) can be driven alone.
이때, 상기 제2압력센서(19)에 의해 상기 제2컨트롤밸브(8)에 인가되는 파일럿압력을 감지하여 검출신호를 상기 콘트롤러(15)에 입력하게 된다. 또한 상기 제4압력센서(21)에 의해 상기 제2유압펌프(2)로부터 토출되어 상기 제2유압액츄에이터(4)에 공급되는 작동유 압력을 감지하여 검출신호를 상기 콘트롤러(15)에 입력하게 된다.At this time, the pilot pressure applied to the second control valve 8 is sensed by the second pressure sensor 19 to input a detection signal to the controller 15. In addition, the fourth pressure sensor 21 is discharged from the second hydraulic pump 2 to detect the hydraulic oil pressure supplied to the second hydraulic actuator 4 to input the detection signal to the controller 15. .
전술한 바와 같이 상기 제1조작레버(5)의 조작에 의해 제1유압펌프(1)로부터 공급되는 작동유에 의해 상기 제1유압액츄에이터(3)를 단독 구동시키고, 상기 제2조작레버(7)의 조작에 의해 상기 제2유압펌프(2)로부터 공급되는 작동유에 의해 상기 제2유압액츄에이터(4)를 단독 구동시킬 수 있게 된다.As described above, the first hydraulic actuator 3 is driven independently by the hydraulic oil supplied from the first hydraulic pump 1 by the operation of the first operating lever 5, and the second operating lever 7 is operated. By operating the second hydraulic pump (2) by the operation of the second hydraulic actuator 4 can be driven independently.
상기 제1유압액츄에이터(3)에 연결되는 작업장치(일 예로서 아암을 말함), 또는 상기 제2유압액츄에이터(4)에 연결되는 작업장치(일 예로서 붐을 말함)에 상기 메인 릴리프밸브(10)의 설정압력을 초과하는 과부하가 발생되는 경우, 상기 제1유압펌프(1) 또는 제2유압펌프(2)로부터 토출되는 작동유는 상기 드레인유로(9)에 메인 릴리프밸브(10)와, 초기상태를 유지하는 상기 유량공유밸브(12)를 통과하여 작동유탱크(T)로 릴리프된다.The main relief valve may be connected to a work device (for example, an arm) connected to the first hydraulic actuator 3, or a work device (for example, a boom) connected to the second hydraulic actuator 4. When an overload exceeding the set pressure of 10) occurs, the hydraulic fluid discharged from the first hydraulic pump 1 or the second hydraulic pump 2 passes through the main relief valve 10 to the drain flow path 9, Passed through the flow sharing valve 12 to maintain the initial state is relief to the hydraulic oil tank (T).
이때, 도 2에서와 같이, 상기 콘트롤러(15)로부터 상기 체크밸브(14)에 전기적신호가 인가되지않아 상기 체크밸브(14)는 밸브스프링의 탄성력에 의해 개구부가 개방되는 초기상태(파일럿펌프(13)의 작동유가 상기 유량공유밸브(12)에 파일럿압력으로 인가되지못하도록 차단시킨 상태를 말함)를 유지하게 된다. 즉 상기 유량공유밸브(12)의 신호압포트가 상기 체크밸브(14)에 의해 작동유탱크(T)에 연결된 상태이므로 상기 유량공유밸브(12)는 초기상태를 유지할 수 있게 된다.At this time, as shown in Figure 2, since the electrical signal is not applied to the check valve 14 from the controller 15, the check valve 14 is the initial state that the opening is opened by the elastic force of the valve spring (pilot pump ( 13) to prevent the hydraulic oil from being applied to the flow sharing valve 12 at a pilot pressure. That is, since the signal pressure port of the flow sharing valve 12 is connected to the hydraulic oil tank T by the check valve 14, the flow sharing valve 12 can maintain the initial state.
한편, 상기 제1조작레버(5) 조작에 의해 상기 제1컨트롤밸브(6)를 절환시키고 상기 제2조작레버(7)의 조작에 의해 상기 제2컨트롤밸브(8)를 절환시킬 경우, 상기 제1,2압력센서(18,19)에 의해 감지되어 콘트롤러(15)에 입력되는 검출신호에 의해 상기 제1,2유압액츄에이터(3,4)의 구동 여부를 확인할 수 있게 된다.On the other hand, when the first control valve 6 is switched by the first operation lever 5 and the second control valve 8 is switched by the operation of the second operation lever 7, The first and second hydraulic actuators 3 and 4 may be checked by the detection signals detected by the first and second pressure sensors 18 and 19 and input to the controller 15.
또한, 상기 제3,4압력센서(20,21)에 의해 감지되어 콘트롤러(15)에 입력되는 검출신호에 의해 상기 제1,2유압액츄에이터(3,4)에 발생되는 부하압력을 확인할 수 있게 된다.In addition, the load pressure generated in the first and second hydraulic actuators 3 and 4 by the detection signals input by the third and fourth pressure sensors 20 and 21 and input to the controller 15 may be checked. do.
따라서, 상기 제1,2압력센서(18,19)로부터 콘트롤러(15)에 입력되는 검출신호에 의해 상기 제1유압액츄에이터(3)에 연결되는 작업장치와, 상기 제2유압액츄에이터(4)에 연결되는 작업장치를 동작시켜 복합 작업중임을 확인할 수 있다.Accordingly, the work device connected to the first hydraulic actuator 3 by the detection signal input from the first and second pressure sensors 18 and 19 to the controller 15 and the second hydraulic actuator 4. You can confirm that you are working in the complex by operating the connected work device.
이때, 상기 제4압력센서(21)로부터 상기 콘트롤러(15)에 입력되는 검출신호에 의해 상기 제2유압액츄에이터(4)에 연결되는 작업장치에 상기 메인 릴리프밸브(10)의 설정압력을 초과하는 과부하가 발생되는 경우, 상기 콘트롤러(15)로부터 상기 선택밸브(14)에 전기적신호가 인가된다.At this time, the working pressure connected to the second hydraulic actuator 4 by the detection signal input from the fourth pressure sensor 21 to the controller 15 exceeds the set pressure of the main relief valve 10. When an overload occurs, an electrical signal is applied from the controller 15 to the selection valve 14.
따라서, 도 3에서와 같이, 상기 콘트롤러(15)로부터 전기적신호 인가에 의해 상기 선택밸브(14)가 도면상, 하측방향으로 절환되므로, 상기 파일럿펌프(13)의 작동유가 상기 선택밸브(14)를 경유하여 상기 유량공유밸브(12)의 신호압포트에 파일럿압력으로 인가된다. 즉 상기 유량공유밸브(12)는 도면상, 하측방향으로 절환되므로 상기 작동유탱크(T)와 연결되는 드레인유로(9)는 차단된다.Therefore, as shown in FIG. 3, since the selection valve 14 is switched downward in the drawing by the application of an electrical signal from the controller 15, the operating oil of the pilot pump 13 is changed to the selection valve 14. The pilot pressure is applied to the signal pressure port of the flow rate sharing valve 12 via. That is, since the flow sharing valve 12 is switched in the downward direction, the drain flow path 9 connected to the hydraulic oil tank T is blocked.
따라서, 상기 제2유압액츄에이터(4)에 연결되는 작업장치에 상기 메인 릴리프밸브(10)의 설정압력을 초과하는 과부하가 발생되는 경우, 상기 제2유압펌프(2)의 작동유를 작동유탱크(T)로 릴리프시키지않고, 상기 유량공유밸브(12) 및 공유유로(17)를 통과시켜 제1유압펌프(1)에 연결되는 제1유압액츄에이터(3)에 보충 공급할 수 있게 된다.Therefore, when an overload exceeding the set pressure of the main relief valve 10 occurs in the work device connected to the second hydraulic actuator 4, the hydraulic oil of the second hydraulic pump 2 is supplied to the hydraulic oil tank T. It is possible to make a supplementary supply to the first hydraulic actuator (3) connected to the first hydraulic pump (1) by passing through the flow rate sharing valve (12) and the shared flow passage (17) without relief.
전술한 바와 같이 상기 제1,2유압액츄에이터(3,4)가 구동되어 복합 작업중이고, 상기 제2유압액츄에이터(4)에 연결되는 작업장치에 상기 메인 릴리프밸브(10)의 설정압력을 초과하는 과부하가 발생되는 경우, 상기 제2유압펌프(2)의 작동유를 상기 메인 릴리프밸브(10), 유량공유밸브(12), 공유유로(17)에 설치된 체크밸브(16)를 통과시켜 상기 제1유압펌프(1)의 유로(1a)에 공급하게 된다. 이로 인해 상기 제1유압펌프(1)로부터 토출되는 작동유에 합류시킬 수 있게 된다.As described above, the first and second hydraulic actuators 3 and 4 are driven to perform a combined operation, and the working device connected to the second hydraulic actuator 4 exceeds the set pressure of the main relief valve 10. When an overload occurs, the hydraulic fluid of the second hydraulic pump 2 passes through the main relief valve 10, the flow sharing valve 12, and the check valve 16 installed in the shared flow path 17 to the first hydraulic pump. It is supplied to the flow path 1a of the hydraulic pump 1. As a result, the hydraulic oil discharged from the first hydraulic pump 1 can be joined.
한편, 상기 제1,2압력센서(18,19)에 의한 검출신호에 의해 상기 제1,2유압액츄에이터(3,4)가 구동되어 복합 작업중이고, 상기 제3,4압력센서(20,21)에 의한 검출신호에 의해 상기 제1,2유압액츄에이터(3,4)에 연결되는 작업장치에 상기 메인 릴리프밸브(10)의 설정압력을 초과하는 과부하가 발생된 것으로 판단되는 경우, 상기 콘트롤러(15)로부터 상기 선택밸브(14)에 전기적신호가 인가되지않게 된다.On the other hand, the first and second hydraulic actuators 3 and 4 are driven by the detection signals of the first and second pressure sensors 18 and 19 to perform the combined operation, and the third and fourth pressure sensors 20 and 21 are used. When it is determined that an overload exceeding the set pressure of the main relief valve 10 is generated in the work device connected to the first and second hydraulic actuators 3 and 4 by the detection signal of the controller, No electrical signal is applied to the selection valve 14 from 15).
도 2에서와 같이, 상기 콘트롤러(15)로부터 선택밸브(14)에 전기적신호가 인가되지않아 상기 선택밸브(14)가 초기상태를 유지하고, 또한 상기 파일럿펌프(13)로부터 작동유가 유량공유밸브(12)에 파일럿압력으로 인가되지않아 상기 유량공유밸브(12)가 초기상태를 유지하게 된다.As shown in FIG. 2, no electrical signal is applied from the controller 15 to the selection valve 14 so that the selection valve 14 maintains its initial state, and the operating oil flows from the pilot pump 13 to the flow sharing valve. The flow rate sharing valve 12 is maintained at an initial state because it is not applied to the pilot pressure at 12.
따라서, 상기 제1,2유압펌프(1,2)의 작동유는 상기 드레인유로(9)에 설치된 메인 릴리프밸브(10)와 유량공유밸브(12)를 통과하여 작동유탱크(T)로 릴리프되어진다.Therefore, the hydraulic oil of the first and second hydraulic pumps 1 and 2 passes through the main relief valve 10 and the flow sharing valve 12 installed in the drain passage 9 to be released into the hydraulic oil tank T. .
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, 유압펌프의 작동유에 의해 동작하는 굴삭기의 붐, 아암, 버킷 등의 작업장치에 설정압력을 초과하는 압력 발생시 작동유탱크로 릴리프되는 유량을 재사용할 수 있는 효과가 있다.According to the present invention having the above-described configuration, the effect of being able to reuse the flow rate that is released to the hydraulic oil tank when a pressure exceeding the set pressure in the working device, such as the boom, arm, bucket of the excavator operated by the hydraulic oil of the hydraulic pump have.

Claims (8)

  1. 제1,2유압펌프 및 파일럿펌프;First and second hydraulic pumps and pilot pumps;
    상기 제1유압펌프의 작동유에 의해 구동하는 제1유압액츄에이터;A first hydraulic actuator driven by the hydraulic oil of the first hydraulic pump;
    상기 제2유압펌프의 작동유에 의해 구동하는 제2유압액츄에이터;A second hydraulic actuator driven by the hydraulic oil of the second hydraulic pump;
    조작량에 대응되는 파일럿압력을 출력하는 제1,2조작레버;First and second operation levers outputting pilot pressure corresponding to the operation amount;
    상기 제1유압펌프의 유로에 설치되고, 상기 제1조작레버의 조작에 의해 절환시 상기 제1유압펌프로부터 상기 제1유압액츄에이터에 공급되는 작동유를 제어하는 제1컨트롤밸브;A first control valve installed in a flow path of the first hydraulic pump and controlling hydraulic oil supplied from the first hydraulic pump to the first hydraulic actuator at the time of switching by operation of the first operating lever;
    상기 제2유압펌프의 유로에 설치되고, 상기 제2조작레버의 조작에 의해 절환시 상기 제2유압펌프로부터 상기 제2유압액츄에이터에 공급되는 작동유를 제어하는 제2컨트롤밸브;A second control valve installed in a flow path of the second hydraulic pump and controlling hydraulic oil supplied from the second hydraulic pump to the second hydraulic actuator when switching by operation of the second operation lever;
    상기 제1유압펌프의 유로 및 상기 제2유압펌프의 유로를 작동유탱크에 연결하는 드레인유로에 설치되는 메인 릴리프밸브;A main relief valve installed in the drain flow path connecting the flow path of the first hydraulic pump and the flow path of the second hydraulic pump to the hydraulic oil tank;
    상기 메인 릴리프밸브와 상기 작동유탱크사이의 상기 드레인유로에 설치되고, 상기 제1,2유압액츄에터를 구동시켜 복합 작업하는 도중에 상기 제1,2유압액츄에이터 중 어느 하나에 상기 메인 릴리프밸브의 설정압력을 초과하는 과부하가 발생되는 경우, 과부하가 발생되는 유압액츄에이터에 연결되는 유압펌프로부터 작동유탱크로 릴리프되는 유량을 상기 제1,2유압액츄에이터 중 다른 하나에 공급하게 되는 유량공유밸브;를 구비하는 것을 특징으로 하는 건설기계용 유량 제어장치.The main relief valve is installed in the drain flow path between the main relief valve and the hydraulic oil tank, and the main relief valve is set to any one of the first and second hydraulic actuators during the complex operation by driving the first and second hydraulic actuators. And a flow rate sharing valve configured to supply a flow rate, which is reliefd from the hydraulic pump connected to the overloaded hydraulic actuator to the hydraulic oil tank, to the other one of the first and second hydraulic actuators. Flow control device for a construction machine, characterized in that.
  2. 제1항에 있어서,The method of claim 1,
    상기 제1유압액츄에이터는 좌측 주행모터, 스윙모터 및 아암실린더 중 어느 하나이고, 상기 제2유압액츄에이터는 우측 주행모터, 붐실린더 및 버킷실린더 중 어느 하나인 것을 특징으로 하는 건설기계용 유량 제어장치.The first hydraulic actuator is any one of a left traveling motor, a swing motor and an arm cylinder, and the second hydraulic actuator is any one of a right traveling motor, a boom cylinder and a bucket cylinder.
  3. 제1항에 있어서, 상기 유량공유밸브는According to claim 1, wherein the flow rate sharing valve
    상기 제1유압액츄에이터와 상기 제2유압액츄에이터 중 어느 하나에 상기 메인 릴리프밸브의 설정압력을 초과하는 압력 발생시 작동유를 상기 작동유탱크로 릴리프시키는 초기상태와,An initial state in which one of the first hydraulic actuator and the second hydraulic actuator reliefs hydraulic fluid to the hydraulic oil tank when a pressure exceeding a set pressure of the main relief valve is generated;
    상기 제1,2유압액츄에이터 중 설정압력을 초과하여 과부하가 발생되는 어느 하나의 유압액츄에이터에 연결되는 유압펌프의 유량을 공유유로를 통해 상기 제1,2유압액츄에이터 중 과부하가 발생되지않은 다른 하나에 공급하기 위해 온 상태로 절환되는 파일럿형제어밸브인 것을 특징으로 하는 건설기계용 유량 제어장치.Among the first and second hydraulic actuators, the flow rate of the hydraulic pump connected to any one of the hydraulic actuators in which an overload is generated in excess of the set pressure is transferred to the other one of the first and second hydraulic actuators not overloaded. A flow control device for a construction machine, characterized in that the pilot-type control valve is switched on to supply.
  4. 제3항에 있어서,The method of claim 3,
    상기 파일럿펌프와 상기 유량공유밸브사이의 유로에 설치되고, 온 상태로 절환시 상기 파일럿펌프로부터 공급되는 작동유를 상기 유량공유밸브에 파일럿압력으로 인가시키는 선택밸브;A selection valve installed in a flow path between the pilot pump and the flow rate sharing valve and configured to apply the hydraulic oil supplied from the pilot pump to the flow rate sharing valve at a pilot pressure when switched to an on state;
    상기 선택밸브를 온 상태로 절환시키기 위해 전기적신호를 인가시키는 콘트롤러;를 구비하는 것을 특징으로 하는 건설기계용 유량 제어장치.And a controller for applying an electrical signal to switch the selection valve to an on state.
  5. 제4항에 있어서, 상기 선택밸브는The method of claim 4, wherein the selection valve
    상기 유량공유밸브의 신호압포트를 상기 작동유탱크에 연결하는 초기상태와,An initial state of connecting the signal pressure port of the flow sharing valve to the hydraulic oil tank;
    상기 유량공유밸브에 파일럿압력을 인가시켜 절환시키기 위해 전기적신호 인가시 온 상태로 절환되는 솔레노이드밸브가 사용되는 것을 특징으로 하는 건설기계용 유량 제어장치.And a solenoid valve switched to an on state when an electrical signal is applied to switch the pilot pressure to the flow sharing valve.
  6. 제4항에 있어서, 상기 선택밸브는The method of claim 4, wherein the selection valve
    상기 파일럿펌프로부터 공급되는 작동유를 인가되는 전기적신호에 대응되게 파일럿압력을 생성하여 상기 유량공유밸브에 생성된 파일럿압력을 인가시키는 전자비례감압밸브가 사용되는 것을 특징으로 하는 건설기계용 유량 제어장치.And an electromagnetic proportional pressure reducing valve for generating a pilot pressure corresponding to an electrical signal applied with the hydraulic oil supplied from the pilot pump to apply the generated pilot pressure to the flow sharing valve.
  7. 제4항에 있어서,The method of claim 4, wherein
    상기 제1조작레버의 조작에 의해 상기 제1컨트롤밸브에 인가되는 파일럿압력을 감지하여 상기 콘트롤러에 검출신호를 출력하는 제1압력센서;A first pressure sensor which senses a pilot pressure applied to the first control valve by an operation of the first control lever and outputs a detection signal to the controller;
    상기 제2조작레버의 조작에 의해 상기 제2컨트롤밸브에 인가되는 파일럿압력을 감지하여 상기 콘트롤러에 검출신호를 출력하는 제2압력센서;A second pressure sensor which detects a pilot pressure applied to the second control valve by operating the second operation lever and outputs a detection signal to the controller;
    상기 제1,2유압펌프에 설정압력을 초과하는 압력 발생되는 것을 감지하여 상기 콘트롤러에 검출신호를 출력하는 제3,4압력센서를 구비하여,The first and second hydraulic pumps are provided with a third and fourth pressure sensors for detecting the occurrence of a pressure exceeding a set pressure and outputting a detection signal to the controller.
    상기 콘트롤러는 상기 제1,2압력센서로부터 입력되는 검출신호에 의해 상기 제1,2유압액츄에이터의 구동에 의해 복합 작업 중이고, 상기 제3,4압력센서로부터입력되는 검출신호에 의해 상기 제1,2유압액츄에이터 중 어느 하나에 상기 메인 릴리프밸브의 설정압력을 초과하는 압력이 발생되는 경우, 상기 선택밸브에 전기적신호를 인가시키는 것을 특징으로 하는 건설기계용 유량 제어장치.The controller is in a complex operation by driving the first and second hydraulic actuators by detection signals input from the first and second pressure sensors, and the first and second detection signals are input by detection signals input from the third and fourth pressure sensors. 2. When the pressure exceeds the set pressure of the main relief valve is generated in any one of the hydraulic actuator, the flow control device for a construction machine, characterized in that for applying an electrical signal to the selection valve.
  8. 제3항에 있어서,The method of claim 3,
    상기 공유유로에 설치되는 체크밸브, 상기 체크밸브는 상기 제1,2유압액츄에이터 중 설정압력을 초과하여 과부하가 발생되는 어느 하나의 유압액츄에이터에 연결되는 유압펌프의 유량을 상기 공유유로를 통해 상기 제1,2유압액츄에이터 중 과부하가 발생되지않은 다른 하나에 공급시킬 경우 유량 역류되는 것을 방지시킴;을 특징으로 하는 건설기계용 유량 제어장치.The check valve installed in the shared flow passage, the check valve is the flow rate of the hydraulic pump connected to any one of the hydraulic actuator in which the overload occurs exceeding the set pressure of the first and second hydraulic actuators through the shared passage The flow rate control device for a construction machine, characterized in that the flow rate is prevented from flowing back when supplied to the other one of the 1,2 hydraulic actuator that is not overloaded.
PCT/KR2014/011999 2014-12-08 2014-12-08 Flow rate control device for construction machine WO2016093378A1 (en)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN107201761A (en) * 2017-06-05 2017-09-26 柳州柳工挖掘机有限公司 Excavate Electrical Control positive flow control method
CN107905287A (en) * 2017-10-24 2018-04-13 柳州柳工挖掘机有限公司 Digger engine start-stop control system and control method
CN109356218A (en) * 2018-11-22 2019-02-19 广西柳工机械股份有限公司 Loading machine distributing valve and loader hydraulic system
CN110747929A (en) * 2019-09-19 2020-02-04 山东临工工程机械有限公司 Power and torque distribution control method for positive flow excavator

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JPH07158607A (en) * 1993-12-09 1995-06-20 Hitachi Constr Mach Co Ltd Valve device for regenerative circuit
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KR20100044585A (en) * 2008-10-22 2010-04-30 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Hydraulic circuit of construction equipment of having swing apparatus
JP2011043219A (en) * 2009-08-21 2011-03-03 Caterpillar Sarl Warm-up control device of hydraulic circuit
JP2014512497A (en) * 2011-04-19 2014-05-22 ボルボ コンストラクション イクイップメント アーベー Hydraulic circuit for boom control of construction machinery

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JPH07158607A (en) * 1993-12-09 1995-06-20 Hitachi Constr Mach Co Ltd Valve device for regenerative circuit
KR20090028874A (en) * 2007-09-17 2009-03-20 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Hydraulic circuit for heavy equipment
KR20100044585A (en) * 2008-10-22 2010-04-30 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Hydraulic circuit of construction equipment of having swing apparatus
JP2011043219A (en) * 2009-08-21 2011-03-03 Caterpillar Sarl Warm-up control device of hydraulic circuit
JP2014512497A (en) * 2011-04-19 2014-05-22 ボルボ コンストラクション イクイップメント アーベー Hydraulic circuit for boom control of construction machinery

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107201761A (en) * 2017-06-05 2017-09-26 柳州柳工挖掘机有限公司 Excavate Electrical Control positive flow control method
CN107905287A (en) * 2017-10-24 2018-04-13 柳州柳工挖掘机有限公司 Digger engine start-stop control system and control method
CN107905287B (en) * 2017-10-24 2019-09-17 柳州柳工挖掘机有限公司 Digger engine start-stop control system and control method
CN109356218A (en) * 2018-11-22 2019-02-19 广西柳工机械股份有限公司 Loading machine distributing valve and loader hydraulic system
CN110747929A (en) * 2019-09-19 2020-02-04 山东临工工程机械有限公司 Power and torque distribution control method for positive flow excavator

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