WO2016182099A1 - Circuit hydraulique pour engin de chantier - Google Patents

Circuit hydraulique pour engin de chantier Download PDF

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Publication number
WO2016182099A1
WO2016182099A1 PCT/KR2015/004768 KR2015004768W WO2016182099A1 WO 2016182099 A1 WO2016182099 A1 WO 2016182099A1 KR 2015004768 W KR2015004768 W KR 2015004768W WO 2016182099 A1 WO2016182099 A1 WO 2016182099A1
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WO
WIPO (PCT)
Prior art keywords
hydraulic
hydraulic oil
actuator
port
hydraulic actuator
Prior art date
Application number
PCT/KR2015/004768
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English (en)
Korean (ko)
Inventor
주상규
구본석
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
주상규
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, 주상규 filed Critical 볼보 컨스트럭션 이큅먼트 에이비
Priority to PCT/KR2015/004768 priority Critical patent/WO2016182099A1/fr
Publication of WO2016182099A1 publication Critical patent/WO2016182099A1/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 to a plurality of hydraulic actuators from a single hydraulic pump.
  • FIG. 1 is a hydraulic circuit diagram for a construction machine according to the prior art.
  • hydraulic pump 1 As shown in Fig. 1, a variable displacement hydraulic pump (hereinafter referred to as “hydraulic pump”) 1 is connected to an engine (not shown) or the like.
  • At least one hydraulic actuator (2, 3, 4) driven by the hydraulic oil of the hydraulic pump (1) is connected to the hydraulic pump (1).
  • the hydraulic oil of the hydraulic pump 1 is supplied to the hydraulic actuators (2, 3, 4) through the pump passage (5), or discharged from the hydraulic actuators (2, 3, 4)
  • a metering valve 7 for draining the hydraulic oil to the hydraulic oil tank T through the tank oil passage 6 is installed in the flow path between the hydraulic pump 1 and the hydraulic actuators 2, 3, 4.
  • the metering valve 7 (IMV; independent metering valve)
  • Second metering valve 7b for supplying the hydraulic oil of the hydraulic pump 1 to the other port of the hydraulic actuators 2, 3, and 4 (e.g., a small chamber) during switching by application of an electrical signal.
  • Port relief valves 9 and 10 are respectively installed in the relief passage 8 connected to one port and the other port of the hydraulic actuators 2, 3 and 4.
  • the port relief valves 9 and 10 are hydraulic actuators 2, 3 and 4 when the pressure generated by the hydraulic actuators 2, 3 and 4 exceeds the set pressure of the port relief valves 9 and 10.
  • Relief valves 9a, 10a protecting the hydraulic actuators 2, 3, 4 and the hydraulic actuators 2, 3, and 4 are driven by draining a part of the hydraulic oil to the hydraulic oil tank T.
  • cavitation occurs when the pressure becomes lower than the set pressure in the hydraulic oil tank T, the hydraulic oil of the hydraulic oil tank T is transferred to the hydraulic actuators 2, 3, and 4 through the tank flow path 6. It consists of check valves 9b and 10b that supply to and compensate for.
  • the first and third metering valves ( 7a, 7c are switched to the ON state to open the opening.
  • the second and fourth metering valves 7b and 7d maintain an initial state in which the opening is blocked by the elastic force of the valve spring because no electrical signal is applied.
  • the hydraulic oil of the hydraulic pump 1 is supplied to one port of the hydraulic actuator 2 via the pump passage 5 and the first metering valve 7a.
  • the hydraulic oil discharged from the other port of the hydraulic actuator (2) is returned to the hydraulic oil tank (T) via the third metering valve (7c) and the tank flow path (6).
  • the said hydraulic actuator 2 can be extended-driven (The drive of the said hydraulic actuators 3 and 4 becomes the same as the drive of the hydraulic actuator 2, and detailed description is abbreviate
  • the hydraulic actuators 2, 3, and 4 are provided with a plurality of port relief valves 9 and 10 each consisting of relief valves 9a and 10a and check valves 9b and 10b, the number of parts constituting the hydraulic circuit is increased. There is a problem that the cost and manufacturing cost is increased, so the overall price of the equipment rises, the price competitiveness falls.
  • the present invention is to solve the above problems, in the hydraulic circuit for construction machinery to control the hydraulic fluid supplied from a single hydraulic pump to a plurality of hydraulic actuators, a plurality of hydraulic pressure by a single port relief valve when the hydraulic actuator is overloaded
  • An object of the present invention is to provide a hydraulic circuit for a construction machine that can protect an actuator.
  • At least one hydraulic actuator driven by the hydraulic oil of the hydraulic pump
  • a metering valve that supplies and compensates the hydraulic oil supplied from the hydraulic oil tank through the tank flow path to the hydraulic actuator when the pressure generated during operation of the hydraulic actuator falls below a set pressure in the hydraulic oil tank;
  • a non-return check valve installed in the first relief passage connected to the one side port and the other port of the hydraulic actuator
  • a port relief valve installed in a second relief flow passage connected to an inlet of the first relief flow passage and an outlet connected to the hydraulic oil tank, and the port relief valve is configured to generate a pressure exceeding a set pressure of the port relief valve to the hydraulic actuator. And draining a part of the hydraulic oil of the hydraulic actuator to the hydraulic oil tank through the check valve.
  • FIG. 2 is a hydraulic circuit diagram for a construction machine according to an embodiment of the present invention.
  • FIG. 2 is a hydraulic circuit diagram for a construction machine according to an embodiment of the present invention.
  • a variable displacement hydraulic pump (hereinafter referred to as "hydraulic pump") 1 is connected to an engine (not shown) or the like.
  • At least one hydraulic actuator (2, 3, 4) (e.g., an boom cylinder, an arm cylinder, a bucket cylinder of an excavator) driven by the hydraulic oil of the hydraulic pump 1 is connected to the hydraulic pump 1 Connected.
  • the hydraulic oil of the hydraulic pump 1 When switching by the application of an electrical signal, the hydraulic oil of the hydraulic pump 1 is supplied to the hydraulic actuators (2, 3, 4) through the pump flow path 5 and discharged from the hydraulic actuators (2, 3, 4) The hydraulic oil is drained to the hydraulic oil tank (T) through the tank flow path (6), and the pressure generated during the operation of the hydraulic actuators (2, 3, 4) falls below the set pressure in the hydraulic oil tank (T) to generate cavitation.
  • the hydraulic oil of the hydraulic oil tank (T) When the hydraulic oil of the hydraulic oil tank (T) is supplied to the hydraulic actuator (2, 3, 4) through the tank flow path (6) and the third, fourth untunging valve (7c, 7d) (make up)
  • the metering valve 7 is installed in the conduit between the hydraulic pump 1 and the hydraulic actuators 2, 3, 4.
  • a port relief valve 15 is installed in a second relief flow passage 14 having an inlet connected to the first relief flow passage 11 and an outlet connected to the hydraulic oil tank T, wherein the port relief valve 15 is When the pressure generated in the hydraulic actuator (2, 3, 4) exceeds the set pressure of the port relief valve 15, a part of the hydraulic oil of the hydraulic actuator (2, 3, 4) and the check valve (12 or 13) The hydraulic actuators 2, 3, and 4 may be protected by draining the hydraulic oil tank T through the two relief passages 14.
  • a first metering valve 7a for supplying hydraulic oil of the hydraulic pump 1 to one port of the hydraulic actuators 2, 3, and 4 when switching to an ON state by application of an electrical signal;
  • a second metering valve 7b for supplying hydraulic oil of the hydraulic pump 1 to the other port of the hydraulic actuators 2, 3, and 4 when switching to an ON state by applying an electrical signal;
  • the first metering valve 7a to drain the hydraulic oil discharged from the other port of the hydraulic actuators 2, 3, and 4 to the hydraulic oil tank T when switching to the ON state by applying an electrical signal.
  • the second metering valve 7b to drain the hydraulic oil discharged from one port of the hydraulic actuators 2, 3, and 4 to the hydraulic oil tank T when switching to the ON state by the application of an electrical signal. And a fourth metering valve 7d interlocked with the fourth metering valve.
  • the second and fourth metering valves 7b and 7d maintain an initial state in which the opening is blocked by the elastic force of the valve spring because no electric signal is applied.
  • the hydraulic oil from the hydraulic pump 1 is supplied to one port (large chamber) of the hydraulic actuator 2 via the pump channel 5 and the first metering valve 7a.
  • the hydraulic oil discharged from the other port (small chamber) of the hydraulic actuator 2 is returned to the hydraulic oil tank (T) via the third metering valve (7c) and the tank flow path (6).
  • the said hydraulic actuator 2 can be extended-driven (The drive of the said hydraulic actuators 3 and 4 becomes the same as the drive of the hydraulic actuator 2, and detailed description is abbreviate
  • the plurality of hydraulic actuators 2 are provided by one port relief valve 15. 3 and 4 can be protected (in the conventional hydraulic circuit, the port relief valves 9 and 10 are provided in the hydraulic actuators 2, 3 and 4, respectively).
  • the number of parts constituting the hydraulic circuit for construction machinery can be reduced, thereby reducing the cost and manufacturing cost, thereby lowering the price of the equipment.

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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)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention concerne un circuit hydraulique pour réguler l'huile hydraulique fournie par une pompe hydraulique unique à une pluralité d'actionneurs hydrauliques. Le circuit hydraulique, selon la présente invention, comprend : au moins un actionneur hydraulique entraîné par l'huile hydraulique d'une pompe hydraulique; une soupape de dosage qui fournit l'huile hydraulique de la pompe hydraulique à l'actionneur hydraulique et évacue l'huile hydraulique, qui est évacuée de l'actionneur hydraulique, à un réservoir d'huile hydraulique lors d'une commutation, et compense la pression générée pendant que l'actionneur hydraulique est entraîné, en fournissant l'huile hydraulique du réservoir d'huile hydraulique à l'actionneur hydraulique lorsque la pression chute à la pression de consigne du réservoir d'huile hydraulique ou moins; un clapet de non-retour pour empêcher un reflux, qui est installé sur un premier passage d'écoulement de surpression qui est relié à des orifices opposés de l'actionneur hydraulique pour communiquer avec les orifices; et une soupape de surpression d'orifice installée sur un second passage d'écoulement de surpression pour évacuer une partie de l'huile hydraulique de l'actionneur hydraulique dans le réservoir d'huile hydraulique à travers le clapet de non-retour lorsqu'une pression dépassant une pression de consigne est générée dans l'actionneur hydraulique, le second passage d'écoulement de surpression comprenant une entrée reliée au premier passage d'écoulement de surpression et une sortie reliée au réservoir d'huile hydraulique.
PCT/KR2015/004768 2015-05-12 2015-05-12 Circuit hydraulique pour engin de chantier WO2016182099A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2015/004768 WO2016182099A1 (fr) 2015-05-12 2015-05-12 Circuit hydraulique pour engin de chantier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2015/004768 WO2016182099A1 (fr) 2015-05-12 2015-05-12 Circuit hydraulique pour engin de chantier

Publications (1)

Publication Number Publication Date
WO2016182099A1 true WO2016182099A1 (fr) 2016-11-17

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PCT/KR2015/004768 WO2016182099A1 (fr) 2015-05-12 2015-05-12 Circuit hydraulique pour engin de chantier

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Country Link
WO (1) WO2016182099A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0567655U (ja) * 1992-05-20 1993-09-07 日立建機株式会社 油圧ショベルの油圧回路
KR20060106661A (ko) * 2005-03-31 2006-10-12 나부테스코 가부시키가이샤 유압 회로 및 그 밸브 장치
JP2013072444A (ja) * 2011-09-26 2013-04-22 Kobe Steel Ltd 作業機械の油圧駆動装置
KR20140050004A (ko) * 2011-07-12 2014-04-28 볼보 컨스트럭션 이큅먼트 에이비 건설기계용 유압 액츄에이터 댐핑 제어시스템
KR101389956B1 (ko) * 2007-04-25 2014-04-30 가야바코교 가부시기가이샤 유체압 구동유닛 및 제설장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0567655U (ja) * 1992-05-20 1993-09-07 日立建機株式会社 油圧ショベルの油圧回路
KR20060106661A (ko) * 2005-03-31 2006-10-12 나부테스코 가부시키가이샤 유압 회로 및 그 밸브 장치
KR101389956B1 (ko) * 2007-04-25 2014-04-30 가야바코교 가부시기가이샤 유체압 구동유닛 및 제설장치
KR20140050004A (ko) * 2011-07-12 2014-04-28 볼보 컨스트럭션 이큅먼트 에이비 건설기계용 유압 액츄에이터 댐핑 제어시스템
JP2013072444A (ja) * 2011-09-26 2013-04-22 Kobe Steel Ltd 作業機械の油圧駆動装置

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