WO2016208780A1 - Circuit hydraulique pour engin de chantier - Google Patents

Circuit hydraulique pour engin de chantier Download PDF

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Publication number
WO2016208780A1
WO2016208780A1 PCT/KR2015/006319 KR2015006319W WO2016208780A1 WO 2016208780 A1 WO2016208780 A1 WO 2016208780A1 KR 2015006319 W KR2015006319 W KR 2015006319W WO 2016208780 A1 WO2016208780 A1 WO 2016208780A1
Authority
WO
WIPO (PCT)
Prior art keywords
boom
hydraulic pump
bucket
cylinder
control valve
Prior art date
Application number
PCT/KR2015/006319
Other languages
English (en)
Korean (ko)
Inventor
강민혁
김진욱
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
강민혁
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, 강민혁 filed Critical 볼보 컨스트럭션 이큅먼트 에이비
Priority to PCT/KR2015/006319 priority Critical patent/WO2016208780A1/fr
Publication of WO2016208780A1 publication Critical patent/WO2016208780A1/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 combined flow rate supplied from the hydraulic pump to the working device when a plurality of working devices are operated simultaneously and combined work.
  • FIG. 1 is a hydraulic circuit diagram for a construction machine in a boom up and bucket in state according to the prior art.
  • a variable displacement first hydraulic pump 1 (hereinafter referred to as a first hydraulic pump) and a variable displacement second hydraulic pump 2 (hereinafter referred to as a second hydraulic pump) include an engine ( Not shown).
  • An arm cylinder 3 driven by the hydraulic oil of the first hydraulic pump 1 is connected to the first hydraulic pump 1 through the supply passage 4.
  • An arm control valve 5 for controlling the hydraulic oil flow direction supplied to the arm cylinder 3 at the time of switching by the application of a pilot pressure is provided on the downstream side of the supply passage 4 of the first hydraulic pump 1. Is installed.
  • the arm control valve (CBP) of the supply flow path 4 of the first hydraulic pump 1 has a CBP (center by pass) valve 6 which forms a pressure in the supply flow path 4 at the time of switching by application of a pilot pressure. 5) is installed on the downstream side.
  • CBP center by pass valve
  • the boom cylinder 7 and the bucket cylinder 8 driven by the working oil of the second hydraulic pump 2 are connected to the second hydraulic pump 2 through the supply passages 9 and 9a.
  • a bucket control valve 10 for controlling the hydraulic oil flow direction supplied to the bucket cylinder 8 at the time of switching by the application of pilot pressure is provided on the downstream side of the supply passage 9 of the second hydraulic pump 2. Is installed.
  • a boom first control valve 11 for controlling the flow direction of the hydraulic oil supplied to the boom cylinder 7 at the time of switching by the application of a pilot pressure is upstream of the supply flow path 9 of the second hydraulic pump 2. Is installed on the side.
  • Boom second control valve 13 for supplying the hydraulic oil of the first hydraulic pump 1 to the bucket cylinder 8 or the boom cylinder 7 through the confluence passage 12 at the time of switching by application of pilot pressure. MCV) is provided upstream of the supply passage 4 of the first hydraulic pump 1.
  • a part of the hydraulic oil of the second hydraulic pump 2 is supplied to the large chamber of the boom cylinder 7 through the supply passage 9 and the boom first control valve 11 and at the same time, the second hydraulic pump.
  • a part of the working oil of (2) passes through the flow path 9a and the bucket control valve 10 and is supplied to the large chamber of the bucket cylinder 8, respectively.
  • the pilot pressure by the operation of the operation lever is simultaneously applied to the boom second control valve 13 and the CBP valve 6 to switch the spool. Accordingly, a part of the hydraulic oil of the first hydraulic pump 1 passes through the second boom control valve 13, the arm control valve 5, the confluence flow passage 12, and the bucket control valve 10 to pass through the bucket cylinder 8. Is supplied to the large chamber. At the same time, a part of the hydraulic oil of the first hydraulic pump 1 passes through the boom second control valve 13, the arm control valve 5, the joining flow passage 12, the flow path 9a and the boom first control valve 11. It is supplied to the large chamber of the boom cylinder 7 so that it is joined with the hydraulic oil supplied from the second hydraulic pump (2).
  • the load generated in the boom cylinder 7 is greater than the load generated in the bucket cylinder 8 when performing a complex operation by boom up and bucket in operation.
  • the hydraulic fluid supplied to join the boom cylinder 7 and the bucket cylinder 8 from the first hydraulic pump 1 in the combined operation is preferentially supplied to the bucket cylinder 8 rather than the boom cylinder 7. And join.
  • the bucket in is unbalanced due to the difference in flow rate supplied from the first hydraulic pump 1 to the boom cylinder 7 and the bucket cylinder 8 and joined. And an imbalance between the boom up operation.
  • the present invention is to solve the above-mentioned problems, the construction to control the combined flow rate supplied from the hydraulic pump to the working device when operating a plurality of working devices at the same time to balance the operation between the working devices It is an object to provide a hydraulic circuit for a machine.
  • the first hydraulic pump and the second hydraulic pump are configured to achieve the above and other objects of the present invention.
  • a CBP valve installed at a downstream side of a supply flow path of the first hydraulic pump
  • a bucket control valve installed downstream of the supply flow path of the second hydraulic pump and controlling a flow direction of the hydraulic oil supplied to the bucket cylinder during switching;
  • a boom first control valve installed at an upstream side of a supply flow path of the second hydraulic pump and configured to control a flow direction of the hydraulic oil supplied to the boom cylinder during switching;
  • a second boom control valve installed at an upstream side of a supply flow path of the first hydraulic pump and configured to supply hydraulic oil of the first hydraulic pump to the bucket cylinder or the boom cylinder through a confluence flow path at the time of switching;
  • the bucket joining shutoff valve installed in the joining flow path and the bucket joining shutoff valve are switched by a pilot pressure applied during a complex operation by driving the boom cylinder and the bucket cylinder, and the switching is performed by closing the joining flow path. It provides a hydraulic circuit for a construction machine, characterized in that for blocking the flow rate of the confluence supplied to the bucket cylinder from the hydraulic pump and supplying the flow rate of confluence to the boom cylinder through the second boom control valve.
  • FIG. 1 is a hydraulic circuit diagram for a construction machine in a boom up and bucket in state according to the prior art
  • FIG. 2 is a hydraulic circuit diagram for a construction machine in a boom up and bucket in state according to an embodiment of the present invention
  • FIG. 3 is a view for explaining a boom up alone driving state in the hydraulic circuit for construction machinery according to an embodiment of the present invention
  • FIG. 4 is a view for explaining the bucket-in alone driving state in the hydraulic circuit for construction machinery according to an embodiment of the present invention.
  • FIG. 2 is a hydraulic circuit diagram for a construction machine in a boom up and a bucket-in state according to an embodiment of the present invention
  • Figure 3 is a circuit for driving the boom up alone in the hydraulic circuit for construction machinery according to an embodiment of the present invention
  • 4 is a circuit for driving a bucket alone in a hydraulic circuit for a construction machine according to an embodiment of the present invention.
  • the hydraulic circuit for a construction machine according to an embodiment of the present invention, the variable displacement first hydraulic pump (hereinafter referred to as the first hydraulic pump) (1) and the variable displacement second hydraulic pressure A pump (hereinafter referred to as a second hydraulic pump) 2 is connected to the engine (not shown) or the like.
  • the first hydraulic pump the variable displacement first hydraulic pump
  • the variable displacement second hydraulic pressure A pump hereinafter referred to as a second hydraulic pump
  • An arm cylinder 3 driven by the hydraulic oil of the first hydraulic pump 1 is connected to the first hydraulic pump 1 through a supply passage 4.
  • An arm control valve 5 for controlling the hydraulic oil flow direction supplied to the arm cylinder 3 at the time of switching by the application of a pilot pressure is provided on the downstream side of the supply passage 4 of the first hydraulic pump 1. Is installed.
  • a CBP valve for forming a pressure in the supply passage 4 at the time of switching by the application of a pilot pressure is installed downstream of the arm control valve 5 in the supply passage 4 of the first hydraulic pump 1. .
  • the boom cylinder 7 and the bucket cylinder 8 driven by the working oil of the second hydraulic pump 2 are connected to the second hydraulic pump 2 through the supply passages 9 and 9a.
  • a bucket control valve 10 for controlling the hydraulic oil flow direction supplied to the bucket cylinder 8 at the time of switching by the application of pilot pressure is provided on the downstream side of the supply passage 9 of the second hydraulic pump 2. Is installed.
  • a boom first control valve 11 for controlling the flow direction of the hydraulic oil supplied to the boom cylinder 7 at the time of switching by the application of a pilot pressure is upstream of the supply flow path 9 of the second hydraulic pump 2. Is installed on the side.
  • Boom second control valve 13 for supplying the hydraulic oil of the first hydraulic pump 1 to the bucket cylinder 8 or the boom cylinder 7 through the confluence passage 12 at the time of switching by application of pilot pressure. MCV) is provided upstream of the supply passage 4 of the first hydraulic pump 1.
  • the boom cylinder 7 and the bucket cylinder 8 is switched by the pilot pressure applied during the compounding operation, and the switching from the first hydraulic pump 1 due to the closing of the confluence passage 12
  • the bucket flow rate blocking valve 14 is connected to the flow path. It is installed at (12).
  • the bucket confluence shutoff valve 14 and the CBP valve 6 are switched by simultaneously applying the pilot pressure applied to the second boom control valve 13 to drive the boom up during the combined operation.
  • Orifice 16 provided in parallel passage 15 branched to supply passage 4 of first hydraulic pump 1 at the inlet side of arm control valve 5 and boom second control valve 13. It may be provided.
  • the spool of the boom first control valve 11 is switched by the pilot pressure applied by the operation of the operation lever (not shown). Therefore, the hydraulic oil of the second hydraulic pump 2 passes through the supply passage 9 and the boom first control valve 11 and is supplied to the large chamber of the boom cylinder 7.
  • pilot pressure by the operation of the operation lever is applied to the boom second control valve 13 to switch the spool. Since the pilot pressure applied to the second boom control valve 13 is simultaneously applied to the CBP valve 6 to switch the spool to close the opening, pressure is formed in the supply passage 4.
  • the hydraulic oil of the first hydraulic pump 1 is connected to the boom second control valve 13, the arm control valve 5, the bucket joining shutoff valve 14, the joining flow passage 12, the flow path 9a and the boom. Since it is supplied to the large chamber of the boom cylinder 7 through the 1st control valve 11, it joins with the hydraulic oil supplied from the said 2nd hydraulic pump 2. As shown in FIG. At this time, the hydraulic oil discharged from the small chamber of the boom cylinder 7 which is extended and driven passes through the boom first control valve 11 and is returned to the hydraulic oil tank.
  • the boom cylinder 7 may be driven by the hydraulic oil supplied from the first and second hydraulic pumps 1 and 2, thereby driving the boom up.
  • the spool of the bucket control valve 10 is switched by the pilot pressure applied by the operation of the operation lever (not shown).
  • the hydraulic oil of the second hydraulic pump 2 passes through the flow path 9a and the bucket control valve 10 and is supplied to the large chamber of the bucket cylinder 8.
  • the hydraulic oil of the first hydraulic pump 1 passes through the second boom control valve 13, the arm control valve 5, and the bucket joining shutoff valve 14 to be supplied to the joining flow path 12.
  • the hydraulic oil supplied from the second hydraulic pump (2) through the flow path (9a) through the bucket control valve 10 is supplied to the large chamber of the bucket cylinder (8).
  • the bucket cylinder 8 may be driven by the hydraulic oil supplied from the first and second hydraulic pumps 1 and 2 to drive the bucket in.
  • the spool of the boom first control valve 11 and the bucket control valve 10 is switched by the pilot pressure applied by the operation of the operation lever. Therefore, a part of the hydraulic oil of the second hydraulic pump 2 passes through the supply passage 9 and the boom first control valve 11 and is supplied to the large chamber of the boom cylinder 7, and at the same time the second hydraulic pump ( A part of the hydraulic oil of 2) passes through the flow path 9a and the bucket control valve 10 and is supplied to the large chamber of the bucket cylinder 8.
  • the pilot pressure by the operation of the operation lever is applied to the boom second control valve 13 to switch the spool.
  • the supply passage 4 of the first hydraulic pump 1 passing through the boom second control valve 13 is always open. Therefore, the hydraulic oil of the first hydraulic pump 1 is supplied to the arm control valve 5 through the supply passage 4 rather than being supplied to the arm control valve 5 through the parallel passage 15 provided with the orifice 16.
  • a pilot pressure applied to switch the boom second control valve 13 is simultaneously applied to the CBP valve 6 and the bucket confluence shutoff valve 14 to switch the spool (shown in FIG. 2).

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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

L'invention concerne un circuit hydraulique pour un engin de chantier, le circuit hydraulique régulant un débit de confluence fourni par une pompe hydraulique à une pluralité d'appareils de travail lorsqu'un travail composite est réalisé en actionnant simultanément les appareils de travail. Le circuit hydraulique, selon la présente invention, comprend : une soupape CBP située au niveau du côté aval le plus loin d'un trajet d'écoulement d'alimentation pour une première pompe hydraulique ; un vérin de flèche et un vérin de benne qui sont entraînés par une huile hydraulique d'une seconde pompe hydraulique ; une soupape de commande de benne qui commande la direction d'écoulement de l'huile hydraulique fournie par la seconde pompe hydraulique au vérin de benne lorsque cette dernière est commutée ; une première soupape de commande de flèche qui commande la direction d'écoulement de l'huile hydraulique fournie par la seconde pompe hydraulique au vérin de flèche lorsque cette dernière est commutée ; une seconde soupape de commande de flèche qui fournit l'huile hydraulique de la première pompe hydraulique au vérin de benne ou au vérin de flèche par l'intermédiaire d'un trajet d'écoulement commun lorsque cette dernière est commutée ; et une soupape d'arrêt de liaison de benne située sur le trajet d'écoulement commun, la soupape d'arrêt de liaison de benne étant commutée en entraînant le vérin de flèche ou le vérin de benne lorsqu'un travail composite est réalisé, et arrêtant le débit de confluence fourni par la première pompe hydraulique au vérin de benne grâce à la fermeture du trajet d'écoulement commun lorsque cette dernière est commutée, et fournissant le débit de confluence au vérin de flèche à travers la seconde soupape de commande de flèche.
PCT/KR2015/006319 2015-06-22 2015-06-22 Circuit hydraulique pour engin de chantier WO2016208780A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2015/006319 WO2016208780A1 (fr) 2015-06-22 2015-06-22 Circuit hydraulique pour engin de chantier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2015/006319 WO2016208780A1 (fr) 2015-06-22 2015-06-22 Circuit hydraulique pour engin de chantier

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WO2016208780A1 true WO2016208780A1 (fr) 2016-12-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111945803A (zh) * 2020-08-25 2020-11-17 中国铁建重工集团股份有限公司 一种铲装机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100023332A (ko) * 2008-08-21 2010-03-04 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 건설장비용 유압시스템
KR20110072587A (ko) * 2009-12-23 2011-06-29 볼보 컨스트럭션 이큅먼트 에이비 건설장비용 유압시스템
KR20120086288A (ko) * 2009-10-15 2012-08-02 히다찌 겐끼 가부시키가이샤 작업 기계의 유압 시스템
KR20140074306A (ko) * 2011-10-07 2014-06-17 볼보 컨스트럭션 이큅먼트 에이비 건설기계용 작업장치 구동 제어시스템
WO2014092222A1 (fr) * 2012-12-14 2014-06-19 볼보 컨스트럭션 이큅먼트 에이비 Circuit hydraulique pour engins de chantier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100023332A (ko) * 2008-08-21 2010-03-04 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 건설장비용 유압시스템
KR20120086288A (ko) * 2009-10-15 2012-08-02 히다찌 겐끼 가부시키가이샤 작업 기계의 유압 시스템
KR20110072587A (ko) * 2009-12-23 2011-06-29 볼보 컨스트럭션 이큅먼트 에이비 건설장비용 유압시스템
KR20140074306A (ko) * 2011-10-07 2014-06-17 볼보 컨스트럭션 이큅먼트 에이비 건설기계용 작업장치 구동 제어시스템
WO2014092222A1 (fr) * 2012-12-14 2014-06-19 볼보 컨스트럭션 이큅먼트 에이비 Circuit hydraulique pour engins de chantier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111945803A (zh) * 2020-08-25 2020-11-17 中国铁建重工集团股份有限公司 一种铲装机

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