US20130291530A1 - Boom-swivel compound drive hydraulic control system of construction machine - Google Patents

Boom-swivel compound drive hydraulic control system of construction machine Download PDF

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Publication number
US20130291530A1
US20130291530A1 US13/996,818 US201013996818A US2013291530A1 US 20130291530 A1 US20130291530 A1 US 20130291530A1 US 201013996818 A US201013996818 A US 201013996818A US 2013291530 A1 US2013291530 A1 US 2013291530A1
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US
United States
Prior art keywords
boom
control valve
hydraulic
flow rate
spool
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.)
Abandoned
Application number
US13/996,818
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English (en)
Inventor
Sang-ho Bang
Byung-Uk Roh
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
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Volvo Construction Equipment AB
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Filing date
Publication date
Application filed by Volvo Construction Equipment AB filed Critical Volvo Construction Equipment AB
Assigned to VOLVO CONSTRUCTION EQUIPMENT AB reassignment VOLVO CONSTRUCTION EQUIPMENT AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BANG, SANG-HO, ROH, Byung-Uk
Publication of US20130291530A1 publication Critical patent/US20130291530A1/en
Abandoned 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
    • E02F9/2292—Systems with two or more pumps
    • 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
    • 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
    • E02F9/2025—Particular purposes of control systems not otherwise provided for
    • E02F9/2037—Coordinating the movements of the implement and of the frame
    • 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
    • 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
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • E02F9/2242—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
    • F15B2211/30595—Assemblies of multiple valves having multiple valves for multiple output members with additional valves between the groups of valves for multiple output members
    • 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
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
    • 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
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6658—Control using different modes, e.g. four-quadrant-operation, working mode and transportation mode
    • 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
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups

Definitions

  • the present invention relates to a hydraulic control system for a combined boom and swing operation of a construction machine such as an excavator. More particularly, the present invention relates to a hydraulic system for a construction machine, in which the driving speeds of the boom and the swing device are adjusted according to working conditions during a combined operation in which boom-up and swing manipulations are carried out to perform an excavating and loading work, thereby ensuring a smooth work.
  • a conventional hydraulic control system for a combined boom and swing operation of a construction machine in accordance with the prior art as shown in FIG. 1 includes:
  • first and second hydraulic pumps 1 and 2 connected to an engine (not shown);
  • an actuator (referring to “arm cylinder”) for a swing device and a work apparatus, which is connected to the first hydraulic pump 1 ;
  • boom cylinder an actuator for a work apparatus (referring to “boom cylinder”) connected to the second hydraulic pump 2 ;
  • a flow rate control valve (MCV) 3 configured to control a flow rate of a hydraulic fluid supplied respectively to the actuators for the swing device and the work apparatus from the first and second hydraulic pumps 1 and 2 .
  • a non-explained reference numeral 11 denotes a boom confluence spool that allows the hydraulic fluid discharged from the first hydraulic pump 1 to join the hydraulic fluid discharged from the second hydraulic pump 2 when a boom-up operation is performed.
  • an operator manipulates a boom manipulation lever 4 to shift a boom spool 5 and a boom confluence spool 11 so that the hydraulic fluid supplied to the boom cylinder via the boom spool 5 from the second hydraulic pump 2 and the hydraulic fluid supplied to the boom cylinder from the first hydraulic pump 1 via the boom confluence spool 11 join each other to cause the boom cylinder to be driven to perform a boom-up operation.
  • an operator manipulates a manipulation lever (not shown) for the swing device to shift a swing spool 6 so that the hydraulic fluid supplied to the arm cylinder from the first hydraulic pump 1 via the swing spool 6 causes the swing device to be driven to swivel the upper swing structure.
  • the hydraulic fluid discharged from the first hydraulic pump 1 is supplied to the boom cylinder via the boom spool 5 to drive the boom cylinder and the hydraulic fluid discharged from the first hydraulic pump 1 is distributingly supplied to the boom cylinder and the swing device, respectively, due to a difference in the pressure between the front ends of the boom confluence spool 11 and the swing spool 6 .
  • the present invention was made to solve the aforementioned problem occurring in the prior art, and it is an object of the present invention to provide a hydraulic control system for a combined boom and swing operation of a construction machine, in which an operator can easily adjust the driving speeds of the boom and the swing device depending on various kinds of working conditions such as the excavation depth or the height of a dump vehicle during a combined operation in which the boom and the swing device are manipulated to smoothly perform an excavating and loading work.
  • Another object of the present invention to provide a hydraulic control system for a combined boom and swing operation of a construction machine, in which in the case where an operator selects a certain work mode needed for the working conditions within an operator cab during the excavating and loading work, the flow rate of the hydraulic fluid distributed to a boom confluence spool and a swing spool is controlled depending on the selected work mode so that the driving speeds of the boom and the swing device can be adjusted under the working conditions needed by the operator.
  • a hydraulic control system for a combined boom and swing operation of a construction machine which includes first and second variable displacement hydraulic pumps, an actuator for a swing device and a work apparatus, which is connected to the first hydraulic pump, an actuator for a work apparatus connected to the second hydraulic pump, and a flow rate control valve configured to control a low rate of a hydraulic fluid supplied respectively to the actuators for the swing device and the work apparatus from the first and second hydraulic pumps, the hydraulic control system including:
  • a work mode selection switch configured to select a preset work mode according to working conditions
  • an electronic proportional pressure control valve mounted in a pilot fluid path that discharges a pilot signal pressure according to a manipulation amount of a boom manipulation lever when the boom manipulation lever is manipulated to perform a boom-up operation, the electronic proportional pressure control valve being configured to output a control signal pressure that is in proportion to the manipulation of the work mode selection switch;
  • variable flow rate control valve mounted in a flow path between the first hydraulic pump and a spool for the swing device, the variable flow rate control valve having an opening area variably adjusted in proportion to the control signal pressure of the electronic proportional pressure control valve;
  • a controller configured to previously set and store various kinds of work modes according to working conditions to control a flow rate of the hydraulic fluid supplied to the swing device spool and a boom confluence spool according to a work mode selected when the work mode selection switch is manipulated,
  • the flow rate of the hydraulic fluid supplied to the swing device spool and the boom confluence spool is variably controlled according to the selected work mode to adjust the driving speeds of the boom and the swing device.
  • the electronic proportional pressure control valve is mounted inside the flow rate control valve.
  • the electronic proportional pressure control valve is mounted outside the flow rate control valve.
  • variable flow rate control valve uses a variable orifice whose opening area is variably adjusted in proportion to the control signal pressure from the electronic proportional pressure control valve.
  • the hydraulic control system for a combined boom and swing operation of a construction machine in accordance with an embodiment of the present invention as constructed above has the following advantages.
  • An operator can easily adjust the driving speeds of the boom and the swing device depending on various kinds of working conditions such as the excavation depth or the height of a dump vehicle during a combined operation in which the boom and the swing device are manipulated to perform an excavating and loading work, thereby improving workability.
  • the driving speeds of the boom and the swing device can be adjusted under the working conditions needed by the operator, thereby improving convenience of the operator.
  • FIG. 1 is a block diagram showing the main elements of a hydraulic control system for a combined boom and swing operation of a construction machine in accordance with the prior art
  • FIG. 2 is a block diagram showing the main elements of a hydraulic control system for a combined boom and swing operation of a construction machine in accordance with an embodiment of the present invention.
  • FIG. 3 is a graph showing the effects of a hydraulic control system for a combined boom and swing operation of a construction machine in accordance with an embodiment of the present invention.
  • EPPRV electronic proportional pressure control valve
  • a hydraulic control system for a combined boom and swing operation of a construction machine in accordance with an embodiment of the present invention as shown in FIG. 2 includes first and second variable displacement hydraulic pumps, an actuator for a swing device and a work apparatus, which is connected to the first hydraulic pump, an actuator for a work apparatus connected to the second hydraulic pump, and a flow rate control valve configured to control a flow rate of a hydraulic fluid supplied respectively to the actuators for the swing device and the work apparatus from the first and second hydraulic pumps.
  • the hydraulic control system includes:
  • a work mode selection switch 8 configured to select a preset work mode according to working conditions
  • an electronic proportional pressure control valve 9 mounted in a pilot fluid path 7 that discharges a pilot signal pressure according to a manipulation amount of a boom manipulation lever 4 when the boom manipulation lever 4 is manipulated to perform a boom-up operation, the electronic proportional pressure control valve 9 being configured to output a control signal pressure that is in proportion to a the manipulation of the work mode selection switch 8 ;
  • variable flow rate control valve 10 mounted in a flow path between the first hydraulic pump 1 and a spool 6 for the swing device, the variable flow rate control valve having an opening area variably adjusted in proportion to the control signal pressure of the electronic proportional pressure control valve 9 ;
  • controller configured to previously set and store various kinds of work modes according to working conditions to control a flow rate of the hydraulic fluid supplied to the swing device spool 6 and a boom confluence spool 11 according to a work mode selected when the work mode selection switch 8 is manipulated,
  • the flow rate of the hydraulic fluid supplied to the swing device spool 6 and the boom confluence spool 11 is variably controlled according to the selected work mode to adjust the driving speeds of the boom and the swing device.
  • the electronic proportional pressure control valve 9 is mounted inside the flow rate control valve (MCV) 3 .
  • the electronic proportional pressure control valve 9 may be constructed as an electro proportional pressure reducing valve (EPPRV), and may be mounted inside the flow rate control valve (MCV) 3 .
  • EPPRV electro proportional pressure reducing valve
  • the electronic proportional pressure control valve 9 is mounted outside the flow rate control valve.
  • variable flow rate control valve 10 may use a variable orifice whose opening area is variably adjusted in proportion to the control signal pressure from the electronic proportional pressure control valve 9 .
  • a non-explained reference numeral 11 denotes a boom confluence spool that allows the hydraulic fluid of the first hydraulic pump 1 to join the hydraulic fluid of the second hydraulic pump 2 when a boom-up operation is performed.
  • the operator manipulates the boom manipulation lever 4 to conduct a boom-up operation and drives the swing device to swivel an upper swing structure in order to perform an excavating and loading work
  • the operator manipulates the work mode selection switch 8 to select a certain work mode suitable for various kinds of working conditions such as the height of the ground surface of an excavation work site or the height of a dump vehicle.
  • a part of a pilot signal pressure passing by the boom manipulation lever 4 is supplied to a boom spool 5 to shift the boom spool according to the boom-up manipulation of the boom manipulation lever 4 .
  • the hydraulic fluid discharged from the second hydraulic pump 2 is supplied to a boom cylinder (not shown) after passing through the boom spool 5 to perform the boom-up operation.
  • a part of the pilot signal pressure passing by the boom manipulation lever 4 is supplied to the electronic proportional pressure control valve 9 mounted in the pilot flow path 7 .
  • the electronic proportional pressure control valve 9 outputs a pilot signal pressure in proportion to a select signal corresponding to a work mode selected according to the manipulation of the work mode selection switch 8 .
  • the signal pressure passing through the electronic proportional pressure control valve 9 is supplied to the variable flow rate control valve 10 so that the opening area of the variable flow rate control valve 10 is controlled. That is, the opening diameter of the variable flow rate control valve 10 is controlled in proportion to the control signal pressure outputted from the electronic proportional pressure control valve 9 depending on the selected work mode.
  • the flow rate of the hydraulic fluid discharged from the first hydraulic pump 1 and supplied to the spool 6 for the swing device is reduced to match the selected work mode, and the flow rate of the hydraulic fluid supplied to the boom confluence spool 11 is increased.
  • the boom-up operation is performed at a relatively high speed as compared to the swing operation of the upper swing structure so that the loading work can be carried out safely.
  • the hydraulic fluid discharged from the first hydraulic pump 1 is supplied to the boom cylinder in proportion to a pilot signal pressure Pi 1 outputted from the electronic proportional pressure control valve 9 to fit the work mode (meaning a line “a” on the graph of FIG. 3 ) selected by the manipulation of the work mode selection switch 8 .
  • the hydraulic control system for a combined boom and swing operation of a construction machine in accordance with an embodiment of the present invention, it is possible to adjust the driving speeds of the boom and the swing device depending on various kinds of working conditions such as the excavation depth or the height of a dump vehicle during a combined operation in which boom-up and swing manipulations are carried out to perform an excavating and loading work.
  • the driving speeds of the boom and the swing device are adjusted under the working conditions needed by the operator, thereby improving convenience and manipulability.

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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)
US13/996,818 2010-12-27 2010-12-27 Boom-swivel compound drive hydraulic control system of construction machine Abandoned US20130291530A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2010/009361 WO2012091187A1 (fr) 2010-12-27 2010-12-27 Système de commande hydraulique d'entraînement combiné flèche/pivot pour machine de construction

Publications (1)

Publication Number Publication Date
US20130291530A1 true US20130291530A1 (en) 2013-11-07

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US13/996,818 Abandoned US20130291530A1 (en) 2010-12-27 2010-12-27 Boom-swivel compound drive hydraulic control system of construction machine

Country Status (6)

Country Link
US (1) US20130291530A1 (fr)
EP (1) EP2660478B1 (fr)
JP (1) JP2014505810A (fr)
KR (1) KR20130137192A (fr)
CN (1) CN103299089B (fr)
WO (1) WO2012091187A1 (fr)

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WO2016111393A1 (fr) * 2015-01-08 2016-07-14 볼보 컨스트럭션 이큅먼트 에이비 Procédé de commande d'entraînement d'actionneur hydraulique d'engin de chantier
US20160251833A1 (en) * 2013-10-31 2016-09-01 Kawasaki Jukogyo Kabushiki Kaisha Hydraulic drive system of construction machine
US9926135B2 (en) * 2012-10-09 2018-03-27 The Heil Co. Externally controlled switch mechanism
US10968604B2 (en) 2017-05-09 2021-04-06 Hitachi Construction Machinery Co., Ltd. Work machine
US11286962B2 (en) * 2017-09-29 2022-03-29 Volvo Construction Equipment Ab Flow control valve and hydraulic machine including the same
US20240084555A1 (en) * 2022-09-08 2024-03-14 XCMG European Reseach Center GmbH Construction machine with a hydraulic system

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CN104520596B (zh) * 2012-08-27 2017-03-08 沃尔沃建造设备有限公司 用于施工机械的液压系统
CN103015473A (zh) * 2012-12-10 2013-04-03 三一重机有限公司 挖掘机、动臂对回转优先控制方法及优先阀
KR102131447B1 (ko) 2013-11-12 2020-07-08 현대모비스 주식회사 차량의 에어벤트
JP6400220B2 (ja) * 2016-03-11 2018-10-03 日立建機株式会社 建設機械の制御装置
CA3081344C (fr) * 2017-11-01 2023-10-17 Clark Equipment Company Systeme de commande pour machine electrique
DE102019201182A1 (de) * 2019-01-30 2020-07-30 Putzmeister Engineering Gmbh Fahrzeug

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EP2660478A1 (fr) 2013-11-06
JP2014505810A (ja) 2014-03-06
EP2660478A4 (fr) 2014-08-20
KR20130137192A (ko) 2013-12-16
EP2660478B1 (fr) 2017-03-15
CN103299089B (zh) 2016-08-10
WO2012091187A1 (fr) 2012-07-05
CN103299089A (zh) 2013-09-11

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