WO2017018557A1 - Circuit hydraulique pour engin de chantier - Google Patents

Circuit hydraulique pour engin de chantier Download PDF

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Publication number
WO2017018557A1
WO2017018557A1 PCT/KR2015/007867 KR2015007867W WO2017018557A1 WO 2017018557 A1 WO2017018557 A1 WO 2017018557A1 KR 2015007867 W KR2015007867 W KR 2015007867W WO 2017018557 A1 WO2017018557 A1 WO 2017018557A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic
control valve
hydraulic cylinder
pump
hydraulic oil
Prior art date
Application number
PCT/KR2015/007867
Other languages
English (en)
Korean (ko)
Inventor
김진욱
강민혁
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
김진욱
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 볼보 컨스트럭션 이큅먼트 에이비, 김진욱 filed Critical 볼보 컨스트럭션 이큅먼트 에이비
Priority to PCT/KR2015/007867 priority Critical patent/WO2017018557A1/fr
Publication of WO2017018557A1 publication Critical patent/WO2017018557A1/fr

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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
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors

Definitions

  • the present invention relates to a hydraulic circuit, and more specifically, to a hydraulic circuit for construction machinery for controlling the hydraulic oil supplied from the hydraulic pump to the hydraulic cylinder and the hydraulic oil returned from the hydraulic cylinder to the hydraulic oil tank.
  • FIG. 1 is a hydraulic circuit diagram for a construction machine according to the prior art.
  • a variable displacement hydraulic pump (hereinafter referred to as a hydraulic pump) 1 and a pilot pump 2 are connected to an engine (not shown).
  • a hydraulic cylinder 3 driven by hydraulic oil supplied from the hydraulic pump 1 is connected to the hydraulic pump 1.
  • An operation lever RCV (not shown) for outputting a pilot pressure corresponding to the operation amount is provided in a flow path between the pilot pump 2 and the control valve 4.
  • the hydraulic oil of the hydraulic pump 1 passes through the spool of the control valve 4 and is supplied to the first chamber 3a of the hydraulic cylinder 3, and the second chamber 3b of the hydraulic cylinder 3 is provided.
  • the hydraulic oil discharged from) passes through the spool of the control valve 4 and is returned to the hydraulic oil tank (T). Therefore, the hydraulic cylinder 3 can be extended and driven.
  • the hydraulic oil of the hydraulic pump 1 passes through the spool of the control valve 4 and is supplied to the second chamber 3b of the hydraulic cylinder 3, and the first chamber 3a of the hydraulic cylinder 1 is supplied.
  • the hydraulic oil discharged from) passes through the spool of the control valve 4 and is returned to the hydraulic oil tank (T). Therefore, it is possible to shrink-drive the hydraulic cylinder 3.
  • the hydraulic oil supplied from the hydraulic pump 1 to the hydraulic cylinder 3 by the operation of the operation lever, and the amount of hydraulic oil discharged from the hydraulic cylinder 3 and returned to the hydraulic oil tank T is It is determined according to the opening area of the spool of the control valve 4 switched corresponding to the operation amount of the operation lever.
  • the notch for supplying the hydraulic oil of the hydraulic pump 1 to the hydraulic cylinder 3 and the notch for returning the hydraulic oil discharged from the hydraulic cylinder 3 to the hydraulic oil tank T are the control valves. It is because it forms in two places in the spool of (4).
  • the hydraulic oil of the hydraulic pump 1 is supplied to the hydraulic cylinder 3 according to the pressure generated in the hydraulic cylinder 3 or the movement of the equipment while the hydraulic cylinder 3 is extended or driven.
  • Independent control of the spool opening area of the control valve (4) for supply to the control valve and the spool opening area of the control valve (4) for returning the hydraulic oil discharged from the hydraulic cylinder (3) to the hydraulic oil tank (T) You will not be able to.
  • the opening area of the spool of the control valve 4 for returning to the valve is controlled dependently by the pilot pressure applied to the control valve 4 by the operation of the operation lever.
  • the present invention is to solve the above-mentioned problems, dualizing the control valve for supplying the hydraulic oil of the hydraulic pump to the hydraulic cylinder or the hydraulic oil discharged from the hydraulic cylinder to the hydraulic oil tank in accordance with the pressure generated in the hydraulic cylinder It is an object of the present invention to provide a hydraulic circuit for construction machinery that can be controlled independently.
  • variable displacement hydraulic pump and a pilot pump a variable displacement hydraulic pump and a pilot pump
  • a hydraulic cylinder driven by the hydraulic oil supplied from the hydraulic pump
  • a hydraulic circuit for a construction machine characterized in that it comprises a proportional control valve for switching by applying a pilot pressure corresponding to the operation amount of the electric operation lever to the first control valve and the second control valve.
  • the present invention having the above-described configuration, during the operation of driving the hydraulic cylinder, supplying the hydraulic oil of the hydraulic pump to the hydraulic cylinder in accordance with the pressure generated in the hydraulic cylinder, or to control the hydraulic oil returned from the hydraulic cylinder to the hydraulic oil tank
  • By independently controlling the control valve for the dual it is possible to prevent excessive pressure rise in the hydraulic cylinder, it is possible to increase the working speed by adjusting the operating flow rate supplied to the hydraulic cylinder.
  • FIG. 2 is a hydraulic circuit diagram for a construction machine according to a preferred embodiment of the present invention.
  • FIG. 2 is a hydraulic circuit diagram for a construction machine according to a preferred embodiment of the present invention.
  • a variable displacement hydraulic pump (hereinafter referred to as a hydraulic pump) 10 and a pilot pump 11 are connected to the engine (not shown).
  • the hydraulic cylinder 12 driven by the hydraulic oil supplied from the hydraulic pump 10 is connected to the hydraulic pump 10.
  • a first control valve (MCV) 14 for returning the hydraulic oil discharged from the first chamber 12a of the cylinder 12 to the hydraulic oil tank T is a flow path between the hydraulic pump 10 and the hydraulic cylinder 12. Is installed on.
  • the second control valve (MCV) 15 for returning to (T) or supplying the hydraulic oil of the hydraulic pump 10 to the second chamber 12b of the hydraulic cylinder 12 is the hydraulic pump 10 And a flow path between the hydraulic cylinder 12.
  • the hydraulic oil supplied from the pilot pump 11 is transferred to the electric control lever 13.
  • the pilot pump has a proportional control valve 16 that converts the secondary pilot pressure to correspond to the manipulated variable and applies the secondary pilot pressure to the first control valve 14 and the second control valve 15 to switch the pilot pressure. (11) and the flow path between the first control valve 14 and the flow path between the pilot pump 11 and the second control valve (15).
  • PPRV proportional pilot reducing valve
  • the first and second proportional control valves 17 and 18 and the third and fourth proportional control valves 19 and 20 provide electrical signals generated by manipulation of the electric control lever 13.
  • the hydraulic cylinder 12 is any one of the boom cylinder, the arm cylinder and the bucket cylinder of the excavator.
  • the opening area of the spool of the first control valve 14 and the second control valve 15 is adjusted according to the magnitude of the pressure generated in the hydraulic cylinder 12 or the machine motion.
  • the flow path between the first control valve 14 and the hydraulic cylinder 12 and the flow path between the second control valve 15 and the hydraulic cylinder 12 is installed in the first It may be provided with a pressure sensor for detecting the pressure generated in the first chamber (12a) and the second chamber (12b).
  • the electrical signal resulting from operating the electric control lever 13 to drive the hydraulic cylinder 12 in an extension drive is the first proportional control valve 17.
  • the second proportional control valve 18 are applied simultaneously.
  • the hydraulic cylinder 12 can be extended and driven.
  • the electrical signal generated by operating the electric control lever 13 to contract the hydraulic cylinder 12 is the third proportional control valve 19.
  • the fourth proportional control valve 20 are applied simultaneously.
  • the electric control lever 13 is operated to switch the first and second control valves 14 and 15 by switching the first and second proportional control valves 17 and 18 so that the hydraulic cylinder ( 12) or the first and second control valves 14 and 15 by switching between the third and fourth proportional control valves 19 and 20 by operating the electric operation lever 13.
  • the hydraulic cylinder 12 can be driven to shrink.
  • the pressure detection signal generated on the first and second chambers 12a and 12b of the hydraulic cylinder 12 by the pressure sensor is input to the control unit ECU not shown, the electric operation is performed by the control unit.
  • the electrical signals applied to the first and second proportional control valves 17 and 18 or the third and fourth proportional control valves 19 and 20 are adjusted.
  • the first, second, third, and fourth proportional control valves 17, 18, 19, and 20 are controlled by controlling the electrical signals applied to the first, second, third, and fourth proportional control valves 13.
  • the magnitude of the pilot pressure applied to the first and second control valves 14 and 15 may be adjusted in the 3, 4 proportional control valves 17, 18, 19, and 20. Therefore, the opening area of the spool of the first and second control valves 14 and 15 can be controlled independently.
  • the first and second control valves 14 and 15 are switched by the operation of the electric operation lever 13 to supply the hydraulic oil of the hydraulic pump 10 to the hydraulic cylinder 12 and the hydraulic cylinder (
  • the first and second control valves by the operation of the electric operation lever 13 according to the pressure generated in the hydraulic cylinder 12 (
  • the spool opening area of 14, 15 can be controlled differently.
  • the electric signal by the operation of the electric operation lever 13 is simultaneously applied to the first and second proportional control valves 17 and 18 so that the first As the two control valves 14 and 15 are switched, the hydraulic oil of the hydraulic pump 10 passes through the first control valve 14 to be supplied to the first chamber 12a of the hydraulic cylinder 12.
  • the hydraulic oil discharged from the second chamber 12b of the hydraulic cylinder 12 may be returned to the hydraulic oil tank T. Therefore, the hydraulic cylinder 12 can be extended and driven.
  • the first and second control valves 14 and 15 are switched by simultaneously applying electric signals generated by the operation of the electric control lever 13 to the third and fourth proportional control valves 19 and 20. Accordingly, the hydraulic oil of the hydraulic pump 10 passes through the second control valve 15 to be supplied to the second chamber 12b of the hydraulic cylinder 12, and the first chamber 12a of the hydraulic cylinder 12 is provided. The hydraulic oil discharged from the tank can be returned to the hydraulic oil tank (T). Therefore, the hydraulic cylinder 12 can be driven to shrink.
  • the hydraulic cylinder 3 is supplied from the hydraulic pump 1 to the hydraulic cylinder 3 by spool switching of one control valve 4 (MCV) during expansion and contraction operation of the hydraulic cylinder 3.
  • MCV control valve 4
  • various priority valves or flow control valves on the main control valve (MCV) and the boom down side Booster valves are installed.
  • equipment to which an electromagnetic hydraulic valve system (not shown) equipped with an independent metering valve (IMV) is applied is provided with a proportional valve installed on top of a poppet installed in a supply passage of a hydraulic pump.
  • IMV independent metering valve
  • the electrohydraulic valve system has a disadvantage in that wear occurs in the seat of the poppet due to the impact of the opening / closing cycle.
  • the control performance of the poppet decreases due to the wear of the seat, the state of mounting the poppet alone and the performance of the electrohydraulic valve system combining the poppet and the electromagnetic proportional valve are different, thereby making it necessary to modify the electrohydraulic valve system.

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

Abstract

La présente invention concerne un circuit hydraulique pour commander de l'huile de travail qui est acheminée depuis une pompe hydraulique jusqu'à un vérin hydraulique et de l'huile de travail qui est renvoyée du vérin hydraulique jusqu'à un réservoir d'huile de travail. La présente invention concerne un circuit hydraulique pour un engin de chantier, caractérisé par le fait qu'il comprend : une pompe hydraulique et une pompe pilote ; un vérin hydraulique actionné par l'huile de travail de la pompe hydraulique ; un niveau manipulé électriquement ; une première soupape de commande installée dans un canal entre la pompe hydraulique et le vérin hydraulique de manière à acheminer, lors de la commutation, l'huile de travail depuis la pompe hydraulique jusqu'à une première chambre du vérin hydraulique ou à renvoyer l'huile de travail qui est déchargée depuis la première chambre du vérin hydraulique jusqu'à un réservoir d'huile de travail ; une seconde soupape de commande installée dans un canal entre la pompe hydraulique et le vérin hydraulique de manière à renvoyer, lors d'une commutation simultanément avec la première soupape de commande, l'huile de travail qui est déchargée depuis une seconde chambre du vérin hydraulique jusqu'au réservoir d'huile de travail ou pour acheminer l'huile de travail de la pompe hydraulique vers la seconde chambre du vérin hydraulique ; et des soupapes de commande proportionnelle installées dans un canal entre la pompe pilote et la première soupape de commande et dans un canal entre la pompe pilote et la seconde soupape de commande, respectivement, de telle sorte que, pour commander indépendamment la zone d'ouverture de tiroir de la première et de la seconde soupape de commande, une pression pilote correspondant au degré de manipulation du niveau manipulé électroniquement soit appliquée sur les première et secondes soupapes de commande, ce qui permet de commuter celles-ci.
PCT/KR2015/007867 2015-07-28 2015-07-28 Circuit hydraulique pour engin de chantier WO2017018557A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2015/007867 WO2017018557A1 (fr) 2015-07-28 2015-07-28 Circuit hydraulique pour engin de chantier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2015/007867 WO2017018557A1 (fr) 2015-07-28 2015-07-28 Circuit hydraulique pour engin de chantier

Publications (1)

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WO2017018557A1 true WO2017018557A1 (fr) 2017-02-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108980129A (zh) * 2018-07-24 2018-12-11 中国航空工业集团公司西安飞行自动控制研究所 一种负载保持控制阀

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006112616A (ja) * 2004-10-11 2006-04-27 Deere & Co 液圧エネルギ増強器
KR100929420B1 (ko) * 2006-12-28 2009-12-03 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 굴삭기의 붐 충격 완화장치 및 그 제어방법
KR20130133447A (ko) * 2012-05-29 2013-12-09 현대중공업 주식회사 굴삭기용 압력제어방식의 독립 유량제어 유압시스템
KR20140050009A (ko) * 2011-07-26 2014-04-28 볼보 컨스트럭션 이큅먼트 에이비 건설기계용 유압시스템
KR20140078860A (ko) * 2012-12-18 2014-06-26 현대중공업 주식회사 폐회로 독립 유량제어방식을 이용한 건설장비용 단독 펌프 유압시스템

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006112616A (ja) * 2004-10-11 2006-04-27 Deere & Co 液圧エネルギ増強器
KR100929420B1 (ko) * 2006-12-28 2009-12-03 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 굴삭기의 붐 충격 완화장치 및 그 제어방법
KR20140050009A (ko) * 2011-07-26 2014-04-28 볼보 컨스트럭션 이큅먼트 에이비 건설기계용 유압시스템
KR20130133447A (ko) * 2012-05-29 2013-12-09 현대중공업 주식회사 굴삭기용 압력제어방식의 독립 유량제어 유압시스템
KR20140078860A (ko) * 2012-12-18 2014-06-26 현대중공업 주식회사 폐회로 독립 유량제어방식을 이용한 건설장비용 단독 펌프 유압시스템

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108980129A (zh) * 2018-07-24 2018-12-11 中国航空工业集团公司西安飞行自动控制研究所 一种负载保持控制阀

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