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WO2016093378A1 - Dispositif de commande de débit destiné à un engin de construction - Google Patents

Dispositif de commande de débit destiné à un engin de construction 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
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic
valve
pressure
pump
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2014/011999
Other languages
English (en)
Korean (ko)
Inventor
박형석
김남건
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volvo Construction Equipment AB
Original Assignee
Volvo Construction Equipment AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volvo Construction Equipment AB filed Critical Volvo Construction Equipment AB
Priority to PCT/KR2014/011999 priority Critical patent/WO2016093378A1/fr
Publication of WO2016093378A1 publication Critical patent/WO2016093378A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

L'invention concerne un circuit de puissance hydraulique pour le recyclage d'un écoulement qui est libéré vers un réservoir d'huile de fonctionnement lorsqu'une pression dépassant une pression prédéfinie survient au niveau d'un appareil d'exploitation fonctionnant au moyen du fluide hydraulique d'une pompe hydraulique. Un circuit de puissance hydraulique, destiné à un engin de construction selon la présente invention, comprend : des première et seconde pompes hydrauliques et une pompe pilote; un premier actionneur hydraulique qui est entraîné par le fluide hydraulique de la première pompe hydraulique; un second actionneur hydraulique qui est entraîné par le fluide hydraulique de la seconde pompe hydraulique; des premier et second leviers de commande; une première soupape de commande permettant de commander le fluide hydraulique qui est fourni de la première pompe hydraulique au second actionneur hydraulique au moment de la commutation; une seconde soupape de commande permettant de commander le fluide hydraulique qui est fourni de la seconde pompe hydraulique au second actionneur hydraulique au moment de la commutation; un clapet de décharge principal qui est installé dans le trajet d'écoulement de la première pompe hydraulique et dans un trajet d'écoulement de drainage qui relie le trajet d'écoulement de la seconde pompe hydraulique vers le réservoir d'huile de fonctionnement; et un clapet de partage d'écoulement installé dans le trajet d'écoulement de drainage entre le clapet de décharge principal et le réservoir d'huile de fonctionnement.
PCT/KR2014/011999 2014-12-08 2014-12-08 Dispositif de commande de débit destiné à un engin de construction Ceased WO2016093378A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2014/011999 WO2016093378A1 (fr) 2014-12-08 2014-12-08 Dispositif de commande de débit destiné à un engin de construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2014/011999 WO2016093378A1 (fr) 2014-12-08 2014-12-08 Dispositif de commande de débit destiné à un engin de construction

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WO2016093378A1 true WO2016093378A1 (fr) 2016-06-16

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107201761A (zh) * 2017-06-05 2017-09-26 柳州柳工挖掘机有限公司 挖掘机电控正流量控制方法
CN107905287A (zh) * 2017-10-24 2018-04-13 柳州柳工挖掘机有限公司 挖掘机发动机启停控制系统及控制方法
CN109356218A (zh) * 2018-11-22 2019-02-19 广西柳工机械股份有限公司 装载机用分配阀及装载机液压系统
CN110747929A (zh) * 2019-09-19 2020-02-04 山东临工工程机械有限公司 正流量挖掘机功率及扭矩分配控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07158607A (ja) * 1993-12-09 1995-06-20 Hitachi Constr Mach Co Ltd 再生回路用弁装置
KR20090028874A (ko) * 2007-09-17 2009-03-20 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 중장비용 유압회로
KR20100044585A (ko) * 2008-10-22 2010-04-30 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 선회장치를 구비하는 건설장비용 유압회로
JP2011043219A (ja) * 2009-08-21 2011-03-03 Caterpillar Sarl 油圧回路の暖機制御装置
JP2014512497A (ja) * 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 建設機械のブーム制御用油圧回路

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07158607A (ja) * 1993-12-09 1995-06-20 Hitachi Constr Mach Co Ltd 再生回路用弁装置
KR20090028874A (ko) * 2007-09-17 2009-03-20 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 중장비용 유압회로
KR20100044585A (ko) * 2008-10-22 2010-04-30 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 선회장치를 구비하는 건설장비용 유압회로
JP2011043219A (ja) * 2009-08-21 2011-03-03 Caterpillar Sarl 油圧回路の暖機制御装置
JP2014512497A (ja) * 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 建設機械のブーム制御用油圧回路

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107201761A (zh) * 2017-06-05 2017-09-26 柳州柳工挖掘机有限公司 挖掘机电控正流量控制方法
CN107905287A (zh) * 2017-10-24 2018-04-13 柳州柳工挖掘机有限公司 挖掘机发动机启停控制系统及控制方法
CN107905287B (zh) * 2017-10-24 2019-09-17 柳州柳工挖掘机有限公司 挖掘机发动机启停控制系统及控制方法
CN109356218A (zh) * 2018-11-22 2019-02-19 广西柳工机械股份有限公司 装载机用分配阀及装载机液压系统
CN110747929A (zh) * 2019-09-19 2020-02-04 山东临工工程机械有限公司 正流量挖掘机功率及扭矩分配控制方法

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