WO2014133201A1 - Système hydraulique pour équipement de construction - Google Patents

Système hydraulique pour équipement de construction Download PDF

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Publication number
WO2014133201A1
WO2014133201A1 PCT/KR2013/001584 KR2013001584W WO2014133201A1 WO 2014133201 A1 WO2014133201 A1 WO 2014133201A1 KR 2013001584 W KR2013001584 W KR 2013001584W WO 2014133201 A1 WO2014133201 A1 WO 2014133201A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic
flow path
hydraulic cylinder
return flow
hydraulic pump
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/KR2013/001584
Other languages
English (en)
Korean (ko)
Inventor
정태랑
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/KR2013/001584 priority Critical patent/WO2014133201A1/fr
Publication of WO2014133201A1 publication Critical patent/WO2014133201A1/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
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
    • E02F9/2235—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps including an electronic controller
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members

Definitions

  • the present invention relates to a hydraulic system for construction machinery, and more specifically, when the hydraulic oil is supplied to the small chamber of the hydraulic cylinder and the hydraulic oil discharged from the large chamber is returned to the hydraulic oil tank, the back pressure formed in the return passage can be reduced.
  • Hydraulic pumps operated by an engine or the like;
  • a hydraulic cylinder 2 connected to and operated by the hydraulic pump 1;
  • the main control valve is installed in the flow path between the hydraulic pump 1 and the hydraulic cylinder 2 and controls the operation of the hydraulic cylinder 2 when the spool is switched by a control signal according to the operation of the operation lever 3. (4);
  • a controller 6 for outputting a control signal to the hydraulic pump regulator 5 in order to control the discharge flow rate of the hydraulic pump 1.
  • the hydraulic cylinder 2 is contracted by the hydraulic oil supplied from the hydraulic pump (1).
  • the hydraulic oil from the hydraulic pump 1 is the main control valve (4) It passes through and is supplied to the large chamber of the hydraulic cylinder 2.
  • the hydraulic oil discharged from the small chamber of the hydraulic cylinder 2 passes through the main control valve 4 and is returned to the hydraulic oil tank 8 via the return flow path 7.
  • the hydraulic cylinder 2 is extended and driven by the hydraulic oil supplied from the hydraulic pump (1).
  • the present invention is to solve the above-mentioned problems, when the hydraulic oil is supplied to the small chamber of the hydraulic cylinder and the hydraulic oil discharged from the large chamber is returned to the hydraulic tank to reduce the back pressure formed in the return passage to reduce the energy efficiency of the hydraulic system It is an object of the present invention to provide a hydraulic system for construction machinery that can increase the level of oil pressure.
  • a hydraulic cylinder connected to the hydraulic pump and operated
  • a main control valve installed in a flow path between the hydraulic pump and the hydraulic cylinder and controlling the operation of the hydraulic cylinder when switched by a control signal from the outside;
  • a controller for outputting a control signal to a hydraulic pump regulator for controlling the discharge flow rate of the hydraulic pump
  • a valve installed in the auxiliary return flow path, and when the hydraulic oil from the hydraulic pump is supplied to the small chamber of the hydraulic cylinder, the valve is switched by a control signal input from the controller to open the auxiliary return flow path. It provides a hydraulic system for construction machinery, characterized in that the hydraulic oil discharged from the large chamber of the hydraulic cylinder is discharged to the hydraulic oil tank through the return flow path and the auxiliary return flow path.
  • the inlet side of the auxiliary return passage is connected to the return passage and the outlet side is in direct communication with the hydraulic oil tank.
  • the valve is a
  • the inner diameter of the auxiliary return channel is characterized by the following relationship.
  • L A : S A (MR A + AR A ): MR A
  • the energy efficiency and equipment of the hydraulic system are lowered according to the lower back pressure formed in the return flow path. It is effective to increase fuel economy.
  • FIG. 1 is a hydraulic circuit diagram of a hydraulic system for a construction machine according to the prior art
  • FIG. 2 is a hydraulic circuit diagram of a hydraulic system for a construction machine according to an embodiment of the present invention.
  • FIG. 2 is a hydraulic circuit diagram of a hydraulic system for a construction machine according to a preferred embodiment of the present invention.
  • Hydraulic pumps Variable displacement hydraulic pumps (hereinafter referred to as "hydraulic pumps") 11 operated by an engine or the like;
  • a hydraulic cylinder 12 connected to and operated by the hydraulic pump 11;
  • the main control valve is installed in the flow path between the hydraulic pump 11 and the hydraulic cylinder 12 and controls the operation of the hydraulic cylinder 12 when the spool is switched by a control signal according to the operation of the operation lever 13. (14) (MCV);
  • a controller 16 for outputting a control signal to the hydraulic pump regulator 15 to control the discharge flow rate of the hydraulic pump 11;
  • the spool When the hydraulic oil from the hydraulic pump 11 is supplied to the small chamber of the hydraulic cylinder 12, the spool is switched by a control signal input from the controller 16, and the auxiliary return is provided in the auxiliary return flow path 19.
  • the hydraulic oil discharged from the large chamber of the hydraulic cylinder 12 is discharged to the hydraulic oil tank 17 through the return flow path 18 and the auxiliary return flow path 19, including a valve 20 that opens the flow path 19. .
  • the inlet side of the auxiliary return passage 19 can be connected to the return passage 18 and the outlet side of the auxiliary return passage 19 can be in direct communication with the hydraulic oil tank 17.
  • the valve 20 is
  • It may be an on-off solenoid valve that is switched to the state of opening the auxiliary return passage 19 when the control signal is input from the controller 16 after the initial setting to close the auxiliary return passage 19.
  • the inner diameter of the auxiliary return channel 19 can be defined by the following relationship.
  • L A is the cross sectional area of the large chamber of the hydraulic cylinder 12
  • S A is the cross sectional area of the small chamber of the hydraulic cylinder 12
  • MR A is the inner diameter of the return channel 18, and
  • AR A is the auxiliary return channel 19. Inside diameter).
  • the energy efficiency of the hydraulic system is increased by lowering the back pressure formed in the return flow path. It can be effective.

Landscapes

  • 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)
  • Operation Control Of Excavators (AREA)

Abstract

La présente invention concerne un système hydraulique pour équipement de construction, destiné à réduire une contre-pression formée dans une voie d'écoulement de retour lorsque de l'huile active est apportée à la petite chambre d'un vérin hydraulique, de sorte que l'huile active refoulée à partir d'une grande chambre est retournée vers un réservoir d'huile active. La présente invention concerne un système hydraulique pour équipement de construction, comprenant : une pompe hydraulique ; un vérin hydraulique qui fonctionne du fait qu'il est relié à la pompe hydraulique ; une soupape de régulation principale qui est procurée à une voie d'écoulement entre la pompe hydraulique et le vérin hydraulique et régule le fonctionnement du vérin hydraulique lorsqu'elle est commutée par un signal de régulation en provenance de l'extérieur ; un dispositif de régulation destiné à délivrer le signal de régulation à un régulateur de pompe hydraulique afin de réguler le débit de refoulement de la pompe hydraulique ; une voie d'écoulement de retour auxiliaire reliée à la voie d'écoulement de retour à partir de la soupape de régulation principale jusqu'au réservoir d'huile active ; et une soupape qui est procurée à la voie d'écoulement de retour auxiliaire et commutée par le signal de régulation entré par le dispositif de régulation, afin d'ouvrir la voie d'écoulement de retour auxiliaire lorsque l'huile active en provenance de la pompe hydraulique est apportée à la petite chambre du vérin hydraulique, l'huile active refoulée à partir de la grande chambre du vérin hydraulique étant refoulée vers le réservoir d'huile hydraulique par l'intermédiaire de la voie d'écoulement de retour et de la voie d'écoulement de retour auxiliaire.
PCT/KR2013/001584 2013-02-27 2013-02-27 Système hydraulique pour équipement de construction Ceased WO2014133201A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2013/001584 WO2014133201A1 (fr) 2013-02-27 2013-02-27 Système hydraulique pour équipement de construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2013/001584 WO2014133201A1 (fr) 2013-02-27 2013-02-27 Système hydraulique pour équipement de construction

Publications (1)

Publication Number Publication Date
WO2014133201A1 true WO2014133201A1 (fr) 2014-09-04

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Application Number Title Priority Date Filing Date
PCT/KR2013/001584 Ceased WO2014133201A1 (fr) 2013-02-27 2013-02-27 Système hydraulique pour équipement de construction

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112343874A (zh) * 2019-08-08 2021-02-09 Smc德国股份有限公司 双作用气缸的流体回流装置及用于操作该气缸的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990031196A (ko) * 1997-10-09 1999-05-06 김형벽 굴삭기의 붐 하강 작동시에 발생되는 충격을완화하기 위한 장치
JP2002339904A (ja) * 2001-05-21 2002-11-27 Komatsu Ltd 建設機械の油圧回路
JP2010216608A (ja) * 2009-03-18 2010-09-30 Caterpillar Sarl 作動油の気泡除去回路
KR20100130034A (ko) * 2009-06-02 2010-12-10 볼보 컨스트럭션 이큅먼트 에이비 해머장치를 구비한 굴삭기용 유압시스템
JP2013007175A (ja) * 2011-06-23 2013-01-10 Kobelco Contstruction Machinery Ltd 作業機械

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990031196A (ko) * 1997-10-09 1999-05-06 김형벽 굴삭기의 붐 하강 작동시에 발생되는 충격을완화하기 위한 장치
JP2002339904A (ja) * 2001-05-21 2002-11-27 Komatsu Ltd 建設機械の油圧回路
JP2010216608A (ja) * 2009-03-18 2010-09-30 Caterpillar Sarl 作動油の気泡除去回路
KR20100130034A (ko) * 2009-06-02 2010-12-10 볼보 컨스트럭션 이큅먼트 에이비 해머장치를 구비한 굴삭기용 유압시스템
JP2013007175A (ja) * 2011-06-23 2013-01-10 Kobelco Contstruction Machinery Ltd 作業機械

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112343874A (zh) * 2019-08-08 2021-02-09 Smc德国股份有限公司 双作用气缸的流体回流装置及用于操作该气缸的方法

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