US20140238010A1 - Control system for operating work device for construction machine - Google Patents

Control system for operating work device for construction machine Download PDF

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Publication number
US20140238010A1
US20140238010A1 US14/348,686 US201114348686A US2014238010A1 US 20140238010 A1 US20140238010 A1 US 20140238010A1 US 201114348686 A US201114348686 A US 201114348686A US 2014238010 A1 US2014238010 A1 US 2014238010A1
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United States
Prior art keywords
control valve
boom
control
flow path
center bypass
Prior art date
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Abandoned
Application number
US14/348,686
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English (en)
Inventor
Hea-Gyoon Joung
Young-Bog Song
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: JOUNG, HEA-GYOON, SONG, Young-Bog
Publication of US20140238010A1 publication Critical patent/US20140238010A1/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
    • 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
    • E02F9/2282—Systems using center bypass type changeover valves
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • 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
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
    • E02F9/12—Slewing or traversing gears
    • E02F9/121—Turntables, i.e. structure rotatable about 360°
    • E02F9/123—Drives or control devices specially adapted therefor
    • 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
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • 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
    • 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
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • 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
    • E02F9/2285—Pilot-operated systems
    • 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
    • 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
    • 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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • 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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3133—Regenerative position connecting the working ports or connecting the working ports to the pump, e.g. for high-speed approach stroke

Definitions

  • the present invention relates to an attachment driving control system for a construction machine. More particularly, the present invention relates to an attachment driving control system for a construction machine, in which in the case where two attachments having different operating pressures are simultaneously driven (e.g., the case where a boom for performing a boom descending operation and an attachment such as a bucket are simultaneously driven), a flow rate of a hydraulic fluid is controlled to enable the simultaneous use of a parallel flow path and a tandem flow path, leading to a reduction in a pressure loss occurring in the control valve.
  • two attachments having different operating pressures e.g., the case where a boom for performing a boom descending operation and an attachment such as a bucket are simultaneously driven
  • a flow rate of a hydraulic fluid is controlled to enable the simultaneous use of a parallel flow path and a tandem flow path, leading to a reduction in a pressure loss occurring in the control valve.
  • a conventional boom driving control system for a construction machine in accordance with the prior art as shown in FIG. 1 includes:
  • first and second variable displacement hydraulic pumps (hereinafter, referred to as “first and second hydraulic pumps”) 2 and 3 that are connected to the engine 1 and a pilot pump 4 ;
  • a swing control valve 7 that controls the drive of a swing motor 6
  • an arm control valve 9 that controls the drive of an arm cylinder 8
  • a traveling control valve 11 that controls the drive of a left traveling motor 10
  • the swing control valve, the arm control valve, and the traveling control valve are installed in a first center bypass path 5 of the first hydraulic pump 2 so as to be connected to a parallel flow path 5 a, respectively;
  • a boom control valve 14 a that controls the drive of a boom cylinder 13
  • a bucket control valve 16 that controls the drive of a bucket cylinder 15
  • a traveling control valve 18 that controls the drive of a right traveling motor 17
  • the boom control valve, the bucket control valve, and the traveling control valve are installed in a second center bypass path 12 of the second hydraulic pump 3 and 2 so as to be connected to a parallel flow path 12 a , respectively;
  • a pilot signal pressure from a pilot pump 4 is supplied to the boom control valve 14 via the pressure generation device 19 .
  • the boom control valve 14 is shifted to the left on the drawing sheet to cause the boom to ascend, and thus the hydraulic fluid discharged from the second hydraulic pump 3 is supplied to a large chamber of the boom cylinder 13 via a load check valve 22 and the boom control valve 14 .
  • a hydraulic fluid flowing out of a small chamber of the boom cylinder 13 returns to the hydraulic tank T via the boom control valve 14 .
  • the boom cylinder 13 can be driven in a stretchable manner to cause the boom to ascend.
  • the pilot signal pressure from the pilot pump 4 is supplied to the boom control valve 14 via the pressure generation device 19 .
  • the boom control valve 14 is shifted to the right on the drawing sheet to cause the boom to descend, and thus the hydraulic fluid discharged from the second hydraulic pump 3 is supplied to the small chamber of the boom cylinder 13 via the boom control valve 14 .
  • the hydraulic fluid flowing out of the large chamber of the boom cylinder 13 returns to the hydraulic tank T via the boom control valve 14 and a back pressure check valve 23 .
  • the boom cylinder 13 can be driven in a retractable manner to cause the boom to descend.
  • the back pressure check valve 23 is mounted with a valve spring so that when a hydraulic fluid passes therethrough, a constant pressure is formed.
  • a regeneration line is installed in the back pressure check valve 23 so that the hydraulic fluid flowing out of the large chamber of the boom cylinder 13 can be regenerated to the small chamber of boom cylinder 13 along the regeneration line during the descending of the boom.
  • a lower pressure acts on the boom due to the descending operation by its own weight.
  • a throttle device is installed at a hydraulic fluid inlet side of a control spool (i.e., referring to the boom control valve 14 ) on a boom descending side so that simultaneous manipulability of the boom and the bucket can be maintained.
  • a throttle device is installed in the parallel flow path of each attachment that is operated at a relatively low pressure to produce a pressure causing the boom to ascend so that simultaneous manipulability of the boom for performing a boom ascending operation and another attachment can be implemented.
  • a tandem flow path is formed in the bucket control valve 16 and the traveling control valve 18 which are connected in parallel with the boom control valve 14 through the second center bypass path 12 . That is, in the case where the drive of the bucket cylinder 15 is controlled alone, the hydraulic fluid from the second hydraulic pump 3 flows into the bucket control valve 16 through the parallel flow path 12 a and the tandem flow path, thereby reducing an excessive pressure loss occurring when the hydraulic fluid from the second hydraulic pump 3 flows into the bucket control valve 16 through only the parallel flow path 12 a.
  • the second center bypass path 12 is blocked by the control spool on a boom descending side and the hydraulic fluid is supplied to the bucket cylinder 15 through only the parallel flow path 12 a.
  • a sufficient flow path cannot be secured by a priority control valve installed in the parallel flow path 12 a, thereby inducing an excessive pressure loss, and thus causing an energy loss.
  • variable control valve as a throttle valve 24 (see FIG. 2 ) may be installed in the parallel flow path 12 a, but there is a limitation in securing the flow path using the throttle device.
  • the present invention has been made to solve the aforementioned problem occurring in the prior art, and it is an object of the present invention to provide an attachment driving control system for a construction machine, in which in the case where two attachments having different operating pressures are simultaneously driven as in a boom descending operation and a bucket operation, a hydraulic fluid from the second hydraulic pump is allowed to flow into the bucket control valve through a parallel flow path and a tandem flow path, leading to a reduction in an unnecessary pressure loss occurring in the control valve, thereby reducing an energy loss and thus increasing an efficiency of a hydraulic system.
  • an attachment driving control system for a construction machine in accordance with an embodiment of the present invention, including:
  • first and second variable displacement hydraulic pumps connected to the engine and a pilot pump
  • a swing control valve configured to control the drive of a swing motor, an arm control valve configured to control the drive of an arm cylinder, and a traveling control valve configured to control the drive of a left traveling motor
  • the swing control valve, the arm control valve, and the traveling control valve are installed in a first center bypass path of the first hydraulic pump so as to be connected to a parallel flow path, respectively;
  • a boom control valve configured to control the drive of a boom cylinder, a bucket control valve configured to control the drive of a bucket cylinder, and a traveling control valve configured to control the drive of a right traveling motor
  • the boom control valve, the bucket control valve, and the traveling control valve are installed in a second center bypass path of the second hydraulic pump so as to be connected to a parallel flow path, respectively;
  • pressure generation devices configured to output a control signal corresponding to a manipulation amount
  • a bleed flow path formed on a control spool on a boom descending side of the boom control valve and configured to maintain the second center bypass path in an opened state instead of blocking the second center bypass path when the boom control valve is shifted to descend the boom through the manipulation of the pressure generation device;
  • a center bypass shift valve installed on a lowermost downstream side of the second center bypass path and configured to be shifted by a control signal pressure for shifting the boom control valve
  • the attachment is a bucket
  • the control valve that controls the attachment is the bucket control valve
  • the attachment driving control system for a construction machine in accordance with an embodiment of the present invention as constructed above has the following advantages.
  • a hydraulic fluid from the second hydraulic pump is allowed to flow into the bucket control valve through the parallel flow path and the tandem flow path (i.e., in this case, a flow path can secured as much as a flow rate of the hydraulic fluid passing through the tandem flow path), leading to a reduction in a pressure loss occurring in the control valve, thereby reducing an energy loss.
  • FIG. 1 is a hydraulic circuit diagram showing an attachment driving control system for a construction machine in accordance with the prior art
  • FIG. 2 is an enlarged view showing of an main part of a variable control valve applied to an attachment driving control system for a construction machine in accordance with the prior art;
  • FIG. 3 is a hydraulic circuit diagram showing a attachment driving control system for a construction machine in accordance with an embodiment of the present invention.
  • FIG. 4 is an enlarged view showing of a main part of a priority control valve applied to an attachment driving control system for a construction machine in accordance with an embodiment of the present invention.
  • An attachment driving control system for a construction machine in accordance with an embodiment of the present invention as shown in FIGS. 3 and 4 includes:
  • first and second variable displacement hydraulic pumps (hereinafter, referred to as “first and second hydraulic pumps”) 2 and 3 that are connected to the engine 1 and a pilot pump 4 ;
  • a swing control valve 7 that controls the drive of a swing motor 6
  • an arm control valve 9 that controls the drive of an arm cylinder 8
  • a traveling control valve 11 that controls the drive of a left traveling motor 10
  • the swing control valve, the arm control valve, and the traveling control valve are installed in a first center bypass path 5 of the first hydraulic pump 2 so as to be connected to a parallel flow path 5 a, respectively;
  • a boom control valve 14 a that controls the drive of a boom cylinder 13
  • a bucket control valve 16 that controls the drive of a bucket cylinder 15
  • a traveling control valve 18 that controls the drive of a right traveling motor 17 wherein the boom control valve, the bucket control valve, and the traveling control valve are installed in a second center bypass path 12 of the second hydraulic pump 3 and 2 so as to be connected to a parallel flow path 12 a , respectively;
  • a bleed flow path 25 that is formed on a control spool on a boom descending side of the boom control valve 14 a and maintains the second center bypass path 12 in an opened state instead of blocking the second center bypass path when the boom control valve 14 a is shifted to descend the boom through the manipulation of the pressure generation device 19 ; and a center bypass shift valve 26 that is installed on a lowermost downstream side of the second center bypass path 12 and is shifted by a control signal pressure for shifting the boom control valve 14 a.
  • a hydraulic fluid from the second hydraulic pump 3 flows into the bucket control valve 16 through the parallel flow path 12 a and a tandem flow path connected to the second center bypass path 12 when a boom for performing a boom descending operation and an attachment (i.e., referring to a bucket) having an operating pressure relatively higher than that of the boom are simultaneously driven.
  • the configuration of the attachment driving control system shown in FIG. 1 is the same as that of the attachment driving control system shown in FIG. 1 except the bleed flow path 25 that is formed on a control spool on a boom descending side of the boom control valve 14 a and maintains the second center bypass path 12 in an opened state instead of blocking the second center bypass path 12 when the boom control valve 14 a is shifted to descend the boom through the manipulation of the pressure generation device 19 , and the center bypass shift valve 26 that is installed on the lowermost downstream side of the second center bypass path 12 and is shifted by a control signal pressure for shifting the boom control valve 14 a.
  • the detailed description of the same configuration and operation thereof will be omitted to avoid redundancy, and the same elements are denoted by the same reference numerals.
  • the boom control valve 14 a is shifted to the right on the drawing sheet in response to a pilot signal pressure from the pilot pump 4 , which passes through the pressure generation device 19 , by the manipulation of the pressure generation device 19 .
  • a hydraulic fluid discharged from the second hydraulic pump 3 is supplied to a small chamber of the boom cylinder 13 via a load check valve 22 and the boom control valve 14 a.
  • a hydraulic fluid flowing out of a large chamber of the boom cylinder 13 returns to a hydraulic tank T via the boom control valve 14 a and a back pressure check valve 23 .
  • the boom cylinder 13 is driven in a retractable manner to cause the boom to descend.
  • the hydraulic fluid flowing out of the large chamber of the boom cylinder 13 is partially regenerated to the small chamber of the boom cylinder 13 through a regeneration line formed on a control spool (i.e., referring to the boom control valve 14 a ) on a boom descending side.
  • the hydraulic fluid discharged from the second hydraulic pump 3 is supplied to an inlet side of the bucket control valve 16 via the second center bypass path 12 and the bleed flow path 25 formed on a control spool on a boom descending side of the boom control valve 14 a.
  • the bleed flow path 25 is connected to a spool path of the bucket control valve 16 via a load check valve 27 of the bucket control valve 16 .
  • a hydraulic fluid passing through a priority control valve installed on a parallel flow path 12 a joins a hydraulic fluid passing through the load check valve 27 , and then flows into a spool of the bucket control valve 16 .
  • a hydraulic fluid from the second hydraulic pump 3 flows into the spool of the bucket control valve 16 through the parallel flow path 12 a .
  • the hydraulic fluid from the second hydraulic pump 3 also flows into the spool of the spool of the bucket control valve 16 through the second center bypass path 12 .
  • a pressure loss is reduced as much as a flow rate of a hydraulic fluid flowing into the spool of bucket control valve 16 through the second center bypass path 12 .
  • the reduction in the pressure loss can also be applied to the traveling control valve 18 .
  • the attachment driving control system for a construction machine in accordance with an embodiment of the present invention is advantageous in that in the case where two attachments having different operating pressures are simultaneously driven as in a boom descending operation and a bucket operation, a hydraulic fluid from the second hydraulic pump is allowed to flow into the bucket control valve through the parallel flow path and the tandem flow path, leading to a reduction in a pressure loss occurring in the control valve, thereby increasing energy efficiency of the hydraulic system.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
US14/348,686 2011-10-07 2011-10-07 Control system for operating work device for construction machine Abandoned US20140238010A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2011/007439 WO2013051740A1 (fr) 2011-10-07 2011-10-07 Système de commande pour faire fonctionner un dispositif de travail d'une machine de construction

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US20140238010A1 true US20140238010A1 (en) 2014-08-28

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US14/348,686 Abandoned US20140238010A1 (en) 2011-10-07 2011-10-07 Control system for operating work device for construction machine

Country Status (6)

Country Link
US (1) US20140238010A1 (fr)
EP (1) EP2772653A4 (fr)
JP (1) JP5802338B2 (fr)
KR (1) KR20140074306A (fr)
CN (1) CN103842663A (fr)
WO (1) WO2013051740A1 (fr)

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US20150013318A1 (en) * 2012-01-27 2015-01-15 Doosan Infracore Co., Ltd. Hydraulic pressure control device for swing motor for construction machinery
US20160160883A1 (en) * 2013-07-24 2016-06-09 Volvo Construction Equipment Ab Hydraulic circuit for construction machine
US9790965B2 (en) 2013-02-19 2017-10-17 Volvo Construction Equipment Ab Hydraulic system for construction machine, provided with protection device
US10001146B2 (en) 2013-01-18 2018-06-19 Volvo Construction Equipment Ab Flow control device and flow control method for construction machine
US10094092B2 (en) 2013-06-28 2018-10-09 Volvo Construction Equipment Ab Hydraulic circuit for construction machinery having floating function and method for controlling floating function
EP3832031A4 (fr) * 2019-03-20 2022-05-11 Hitachi Construction Machinery Co., Ltd. Pelle hydraulique

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CN104179738B (zh) * 2014-08-07 2016-04-13 龙工（上海）精工液压有限公司 一种滑移装载机开式液压系统
EP3196367B1 (fr) * 2014-09-19 2022-04-13 Volvo Construction Equipment AB Circuit hydraulique pour engin de chantier
WO2016098926A1 (fr) * 2014-12-17 2016-06-23 볼보 컨스트럭션 이큅먼트 에이비 Procédé de commande pour entraîner un actionneur hydraulique d'un engin de chantier
WO2016208780A1 (fr) * 2015-06-22 2016-12-29 볼보 컨스트럭션 이큅먼트 에이비 Circuit hydraulique pour engin de chantier
JP7198072B2 (ja) * 2018-12-13 2022-12-28 キャタピラー エス エー アール エル 建設機械の油圧制御回路
JP7305532B2 (ja) * 2019-12-28 2023-07-10 株式会社クボタ 流量制御弁

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US20100313557A1 (en) * 2009-06-16 2010-12-16 Volvo Construction Equipment Holding Sweden Ab. Hydraulic system for construction equipment having float function

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JP2014534386A (ja) 2014-12-18
EP2772653A4 (fr) 2015-10-21
WO2013051740A1 (fr) 2013-04-11
KR20140074306A (ko) 2014-06-17
CN103842663A (zh) 2014-06-04
EP2772653A1 (fr) 2014-09-03

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