WO2015068869A1 - Dispositif hydraulique pour engin de chantier - Google Patents

Dispositif hydraulique pour engin de chantier Download PDF

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Publication number
WO2015068869A1
WO2015068869A1 PCT/KR2013/010083 KR2013010083W WO2015068869A1 WO 2015068869 A1 WO2015068869 A1 WO 2015068869A1 KR 2013010083 W KR2013010083 W KR 2013010083W WO 2015068869 A1 WO2015068869 A1 WO 2015068869A1
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WO
WIPO (PCT)
Prior art keywords
boom
control valve
hydraulic
construction machine
signal
Prior art date
Application number
PCT/KR2013/010083
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English (en)
Korean (ko)
Inventor
정해균
김성곤
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
정해균
김성곤
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, 정해균, 김성곤 filed Critical 볼보 컨스트럭션 이큅먼트 에이비
Priority to PCT/KR2013/010083 priority Critical patent/WO2015068869A1/fr
Publication of WO2015068869A1 publication Critical patent/WO2015068869A1/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
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • 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
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/435—Control of dipper or bucket position; Control of sequence of drive operations for dipper-arms, backhoes or the like
    • 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
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • 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
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • F15B11/0426—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling the number of pumps or parallel valves switched on
    • 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
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-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
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31582—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having multiple pressure sources and a single output member

Definitions

  • the present invention relates to a hydraulic device for construction machinery, and more particularly, the flow rate discharged from two hydraulic pumps are joined to the boom cylinder when the operation of the boom in the construction site is joined to the boom cylinder and the speed-up mode switch during the operation of the boom lowering It relates to a hydraulic device for construction machinery that can increase the boom lowering speed by allowing the flow of the boom cylinder to be discharged to the hydraulic tank quickly in accordance with the operation of.
  • construction machinery including excavators or wheel loaders, are utilized for excavation or loading of soil and transfer of materials depending on the work requirements.
  • the work device including the boom, the arm and the bucket is driven by the hydraulic power source, and the movement of the work device is controlled to meet the work demand by the operator's operation.
  • the boom moves to raise and lower the pivotally connected arm and bucket, and the speed of movement is controlled by the flow rate provided to the boom cylinder.
  • FIG. 1 is a schematic view of an excavator for explaining the movement of the boom descending at the construction site
  • Figure 2 schematically shows a conventional hydraulic circuit diagram is driven boom shown in FIG.
  • a construction machine including an excavator typically includes an engine (not shown) installed inside the engine room 3 and a first hydraulic pump connected to the engine to provide hydraulic pressure.
  • the hydraulic pump P1 or the remote control valve 9 for outputting a pilot signal corresponding to the operation amount of the P1, the second hydraulic pump P2 and the operation lever 8 and the boom 2a for the up and down movement.
  • the hydraulic circuit including a boom control valve 6 and a boom confluence control valve 7 switched by an output pilot signal is provided.
  • a pilot signal is output from the remote control valve 9 corresponding to the operation amount of the operation lever 8, and the pilot signal is boom up or boom down. Is provided for spool switching of the boom control valve 6 or the boom confluence control valve 7 through each pilot flow passage 1a or 1b.
  • the boom control valve 6 is spooled to the right in the drawing so that the flow rate discharged from the second hydraulic pump P2 is transferred to the large chamber of the boom cylinder 5 through the supply passage 10b.
  • the boom confluence control valve 7 is also spooled to the right so that the flow rate discharged from the first hydraulic pump P1 is large through the supply passage 10a of the boom cylinder 5. It is supplied to the chamber 5a. Accordingly, during the boom up operation by the driver at the construction site, the boom rises relatively quickly.
  • the boom control valve 6 is spooled to the left in the drawing so that only the supply flow rate of the second hydraulic pump P2 is supplied to the small chamber 5b of the boom cylinder 5.
  • the boom has a relatively slow downward movement.
  • the work device including the boom 9 in the construction site it is necessary to move downward of the construction machine in contact with the ground (H) or to control the downward movement of the boom to the maximum digging depth. In this case, there is a problem that the work efficiency is lowered as the movement section of the boom lowering according to the boom down operation becomes larger.
  • the lowering speed of the boom needs to be controlled more quickly during the boom down operation at the construction site, the conventional hydraulic system is not able to increase the lowering speed of the boom.
  • Korean Patent Publication No. 2001-0061821 discloses a boom lowering speed control device of an excavator.
  • the hydraulic pressure of the large chamber of the boom cylinder is returned to the hydraulic tank through the selector valve.
  • this prior art is also limited to increasing the descending speed due to the weight of the boom, there is a disadvantage that can not increase the descending speed of the boom in accordance with the need of construction sites or boom lowering work.
  • the present invention was created to solve the above problems,
  • the flow rates of the two hydraulic pumps are joined and supplied to the boom cylinder.
  • the boom cylinder flow rate is controlled depending on the speed increase mode so that the construction machine can be quickly discharged to the hydraulic tank.
  • the purpose is to provide a hydraulic device for the purpose.
  • Another object of the present invention is to provide a hydraulic device for a construction machine that detects a lowering operation of the boom and controls the flow rate of the boom cylinder to be quickly discharged to the hydraulic tank.
  • Work tools including booms, arms and buckets
  • First and second hydraulic pumps connected to the engine and supplying hydraulic oil for driving the work device;
  • a remote control valve for outputting a pilot signal corresponding to the operation amount of the operation lever
  • a boom confluence control valve installed between the first hydraulic pump and the hydraulic cylinder for the work device and controlling a confluence flow rate supplied to the boom cylinder when the spool is switched;
  • a boom control valve installed between the second hydraulic pump and the boom cylinder to control movement of the boom
  • a controller electrically connected to the operation lever and outputting a preset control signal during a boom down operation
  • a boom down speed control valve for outputting a pilot signal pressure for switching the boom confluence control valve and the spool of the boom control valve during the boom down operation of the operation lever, the valve opening being controlled by a control signal applied from the controller. It is achieved by providing a hydraulic device for a construction machine comprising a.
  • the boom down speed control valve is composed of a solenoid valve.
  • the boom-down speed control valve is composed of an electromagnetic proportional control valve, the electromagnetic proportional control valve to proportionally control the pilot signal pressure supplied from the pilot pump, accordingly The hydraulic pressure is quickly discharged to the hydraulic tank.
  • a predetermined signal detection sensor is connected to the controller, and the signal detection sensor detects a boom up signal and a boom down signal for the boom confluence control valve and the boom control valve to increase the hydraulic pressure of the boom cylinder. Quickly discharge into the hydraulic tank.
  • the signal detection sensor comprises a pilot signal pressure sensor for spool switching.
  • a speed increase mode switch for increasing the boom lowering speed is connected to the controller.
  • the operator can operate the speed increase mode switch to quickly discharge the flow from the large chamber of the boom cylinder to the hydraulic tank. There is an advantage.
  • the hydraulic device for construction machinery by detecting the lowering operation of the boom, simultaneously controlling the spool switching of the boom control valve and the boom confluence control valve proportionally simultaneously through the boom down speed control valve to increase the flow rate of the boom cylinder It has the advantage of being discharged quickly to the hydraulic tank.
  • FIG. 1 is a schematic diagram of an excavator for explaining the movement of the boom descending at the construction site
  • FIG. 2 is a conventional hydraulic circuit diagram schematically showing the driving of the boom shown in FIG. 1;
  • FIG. 3 is a hydraulic circuit diagram of a hydraulic device for a construction machine according to an embodiment of the present invention.
  • FIG. 4 is a hydraulic circuit diagram of a hydraulic device for a construction machine according to another embodiment of the present invention.
  • Figure 5 is a flow chart illustrating the step of controlling the spool switching of the boom control valve and the boom confluence control valve when operating the speed increase mode switch in accordance with an embodiment of the present invention
  • Figure 6 is a flow chart illustrating the step of controlling the spool switching of the boom control valve and the boom confluence control valve when operating the speed increase mode switch in accordance with another embodiment of the present invention
  • FIG. 1 is a schematic diagram of an excavator for explaining the movement of the boom descending in the construction site
  • Figure 2 is a conventional hydraulic circuit diagram schematically shown to explain the driving of the boom shown in Figure 1
  • Figure 3 is a view of the present invention 4 is a hydraulic circuit diagram of a hydraulic device for a construction machine according to an embodiment
  • FIG. 4 is a hydraulic circuit diagram of a hydraulic device for a construction machine according to another embodiment of the present invention
  • FIG. 5 is an operation of a speed increase mode switch according to an embodiment of the present invention.
  • Figure 6 is a spool switching of the boom control valve and boom confluence control valve during operation of the speed increase mode switch according to another embodiment of the present invention
  • reference numeral 1 denotes a pilot pump
  • 5 denotes a boom cylinder
  • 9 denotes a remote control valve of an operating lever
  • 20 denotes a boom confluence control valve
  • 21 denotes a boom control valve
  • 22 denotes a controller
  • 23 denotes a speed increase mode switch.
  • 40 are schematic representations of boom down speed control valves.
  • the hydraulic device for a construction machine according to the present invention is useful for increasing the work efficiency by increasing the speed of the boom down movement by the operator operating the speed increase mode switch in the construction site.
  • the hydraulic device for a construction machine includes an engine (not shown) mounted inside an engine room 3, a boom 2a, an arm 2b, and a bucket ( A working device 2 including 2c) and first and second hydraulic pumps P1 and P2 connected to the engine and supplying hydraulic oil for driving the working device 2 are included.
  • the work device 2 is composed of a plurality of hydraulic cylinders for the work device driven by the hydraulic oil discharged from the first hydraulic pump (P1) or the second hydraulic pump (P2), the first hydraulic pump ( Between the P1) or the second hydraulic pump P2 and the hydraulic cylinder for the work device, a plurality of hydraulic control valves for controlling the start, stop and direction change of the work device 2 may be configured.
  • the hydraulic oil discharged from the first hydraulic pump (P1) or the second hydraulic pump (P2) Arm cylinder control valve, bucket cylinder control valve or swing motor control valve may be further connected to be connected to the supply passage (10a or 10b).
  • Hydraulic device for a construction machine between the remote control valve 9 for outputting a pilot signal corresponding to the operation amount of the operation lever 8 and the first hydraulic pump (P1) and the hydraulic cylinder for the working device. It is installed between the boom confluence control valve 20 and the second hydraulic pump 21 and the boom cylinder (5) for controlling the flow rate of the flow supplied to the boom cylinder (5) when switching the spool and the boom (2a) It is configured to include a boom control valve 21 for controlling the movement of.
  • the remote control valve 9 outputs the pilot hydraulic oil supplied from the pilot pump 1 as a pilot signal corresponding to the operation amount of the operation lever 8.
  • the hydraulic device for a construction machine the boom down of the controller 22 and the operation lever 8 is electrically connected to the operation lever 8 and outputs a predetermined control signal during the boom down operation. Outputs a pilot signal pressure for switching the spools of the boom confluence control valve 20 and the boom control valve 21 during operation, while the valve opening is controlled by a control signal applied from the controller 22. It is configured to include a speed increase control valve (30, 40).
  • the control signal of the controller 22 includes an output of an electrical signal for performing a series of steps as shown in FIGS. 5 and 6, depending on a preset algorithm.
  • the controller 22 is connected to the boom down speed control valves 30 and 40 through a control line 27.
  • the control line 27 of the controller 22 is connected to a signal pressure port or a solenoid portion 31 or 41 formed in the boomdown speed-up control valves 30 and 40, and an electrical signal of the controller 22.
  • the opening amount or the communication flow rate of the boom down speed increasing control valves 30 and 40 is controlled depending on the output of.
  • the boom down speed control valve is composed of a solenoid valve 30, the solenoid valve 30 is configured to include a solenoid portion 31 and the inner flow path (33).
  • the boom down speed control valve is composed of an electromagnetic proportional control valve 40, the electromagnetic proportional control valve 40 is a solenoid portion 41 ) And an internal passage 43 and a pilot signal pressure port 42.
  • the electromagnetic proportional control valve 40 proportionally controls the pilot signal pressure supplied from the pilot pump 1, and accordingly, when a control signal is applied from the controller 22, the boom confluence control valve 20. ) And a secondary pilot signal pressure for spool switching of the boom control valve 21.
  • a predetermined signal detection sensor 44 is configured to be connected to the controller 22, the signal detection sensor 44 is the boom confluence control valve 20 and boom control valve 21 The hydraulic pressure of the boom cylinder 5 is quickly discharged to the hydraulic tank T by detecting the boom up signal and the boom down signal.
  • the signal detection sensor 44 includes a pilot signal pressure sensor for spool switching, and a boom down signal for the boom confluence control valve 20 and the boom control valve 21, for example, an operation.
  • the pilot signal pressure output from the remote control valve 9 is sensed.
  • a speed increase mode switch 23 for increasing the boom lowering speed is connected to the controller 22.
  • the speed increase mode switch 23 may be electrically connected to the controller 22 through a control line connected to one side of the cab or the operation lever 8.
  • the pilot signal pressure from the remote control valve 9 is transmitted through the pilot line 20a. Is provided.
  • the pilot signal pressure acts as a boom up signal to spool the boom confluence control valve 20 and the boom control valve 21 to the right in the drawing.
  • the pressure oil discharged from the second hydraulic pump P2 is supplied to the large chamber 5a of the boom cylinder 5 through the supply line 13, and at the same time, the pressure oil discharged from the first hydraulic pump P1 also merges.
  • the line 24 is supplied to the large chamber 5a of the boom cylinder 5.
  • the operator can increase the speed of the boom down movement faster by operating the speed increase mode switch 23 in the construction site. For example, when the construction site needs to control the downward movement of the boom 2a to the bottom of the ground H or to the maximum excavation depth, the operator activates the speed increase mode switch 23 ON. In addition, the operation lever 8 of the boom 2a is driven.
  • the driver operates the operation lever 8 while the operator activates the speed increase mode switch 23 in an ON state.
  • the controller 22 provides the solenoid valve 30 with a control signal for speed increase according to a preset algorithm.
  • the solenoid valve 30 acts as a signal pressure control valve for increasing the speed of the boom 2a.
  • the solenoid valve 30 is switched to the right in the drawing so that the internal flow path 33 is a pilot flow path 21a for boom down. In communication with.
  • the pilot signal pressure spools the boom confluence control valve 20 and the boom control valve 21 through the pilot flow passage 21a to the left in the drawing. Accordingly, the pressure oil is simultaneously discharged from the large chamber 5a of the boom cylinder 5 which is under the combined hydraulic pressure to the hydraulic tank T through the respective return lines 26, thereby increasing the downward movement of the boom 2a. do.
  • the above-described boom lowering movement can be controlled at twice the speed according to a preset algorithm in the controller 22, and the speed increase rate is varied to meet the specifications of the equipment and the needs of the operator. Can be modified.
  • the driver activates the speed increase mode switch 23 to the ON (on) state as well as operating the operation lever 8 to the boom
  • the controller 22 provides a control signal for increasing the speed to the proportional control valve 40 according to a preset algorithm.
  • the proportional control valve 40 acts as a proportional signal pressure control valve for increasing the speed of the boom 2a.
  • the proportional control valve 40 is switched to the right in the drawing so that the internal flow path 43 is a pilot flow path for the boom down. It is in communication with 21a.
  • the internal flow path 43 of the proportional control valve 40 is switched to connect the pilot oil pressure discharged from the pilot pump 1 to the pilot flow path 21a.
  • the boom confluence control valve 20 and the boom control valve 21 are spooled to the left in the drawing by the pilot signal pressure via the internal flow path 43 and the pilot flow path 21a of the proportional control valve 40. Switch. Accordingly, the oil pressure is simultaneously discharged from the large chamber 5a of the boom cylinder 5, which is under the combined hydraulic pressure, to the hydraulic tank T through the respective return lines 26, thereby increasing the descending speed of the boom 2a. Will be.
  • the controller 22 determines whether the driver boom down operation. Subsequently, when the speed increase mode switch 23 is activated in the ON state, the downward movement of the boom is controlled to correspond to the secondary signal pressure output through the proportional control valve 40.
  • the driver activates the above-mentioned speed increase mode switch 23 to lower the speed of the boom.
  • the hydraulic device for a construction machine with a float function according to the present invention, when the operation of the boom in the construction site, the flow rate discharged from the hydraulic pumps are joined and supplied to the boom cylinder, under the ground (H) at the construction site Alternatively, when the boom must be lowered to the maximum digging depth, the flow rate of the boom cylinder is quickly discharged to the hydraulic tank according to the operation of the speed increase mode switch, which is very useful for increasing and controlling the boom lowering speed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention concerne un dispositif hydraulique pour un engin de chantier comprenant: une soupape de commande de raccordement de flèche disposée entre une première pompe hydraulique et un vérin hydraulique pour un dispositif de chantier et commandant l'écoulement de raccordement fourni à un vérin de flèche pendant une conversion de tiroir; une soupape de commande de flèche disposée entre une seconde pompe hydraulique et le vérin de flèche et commandant le mouvement de la flèche; un dispositif de commande électriquement connecté à un levier d'actionnement et émettant un signal de commande prédéfini au moment de l'opération de descente; et une soupape de commande d'accélération de descente émettant une pression de signal pilote pour la conversion des tiroirs de la soupape de commande de raccordement de flèche et de la soupape de commande de flèche pendant une opération de descente du levier d'actionnement de sorte qu'un degré d'ouverture de soupape soit commandé selon le signal de commande appliqué depuis le dispositif de commande.
PCT/KR2013/010083 2013-11-07 2013-11-07 Dispositif hydraulique pour engin de chantier WO2015068869A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2013/010083 WO2015068869A1 (fr) 2013-11-07 2013-11-07 Dispositif hydraulique pour engin de chantier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2013/010083 WO2015068869A1 (fr) 2013-11-07 2013-11-07 Dispositif hydraulique pour engin de chantier

Publications (1)

Publication Number Publication Date
WO2015068869A1 true WO2015068869A1 (fr) 2015-05-14

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110848181A (zh) * 2019-10-18 2020-02-28 中联重科股份有限公司 液压传动系统和起重机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010061821A (ko) * 1999-12-29 2001-07-07 양재신 굴삭기의 붐하강 속도제어장치
JP2002212979A (ja) * 2001-01-15 2002-07-31 Shin Caterpillar Mitsubishi Ltd 作業機械におけるブームシリンダの油圧制御回路
KR100795612B1 (ko) * 2001-07-16 2008-01-17 두산인프라코어 주식회사 유압중장비의 붐하강제어장치
KR100876980B1 (ko) * 2003-04-30 2009-01-07 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 붐 플롯포지션 기능을 갖는 유압회로
KR20090111792A (ko) * 2009-09-11 2009-10-27 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 굴삭기의 붐 충격 완화장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010061821A (ko) * 1999-12-29 2001-07-07 양재신 굴삭기의 붐하강 속도제어장치
JP2002212979A (ja) * 2001-01-15 2002-07-31 Shin Caterpillar Mitsubishi Ltd 作業機械におけるブームシリンダの油圧制御回路
KR100795612B1 (ko) * 2001-07-16 2008-01-17 두산인프라코어 주식회사 유압중장비의 붐하강제어장치
KR100876980B1 (ko) * 2003-04-30 2009-01-07 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 붐 플롯포지션 기능을 갖는 유압회로
KR20090111792A (ko) * 2009-09-11 2009-10-27 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 굴삭기의 붐 충격 완화장치

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110848181A (zh) * 2019-10-18 2020-02-28 中联重科股份有限公司 液压传动系统和起重机

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