CN104379846A - 挖掘机用压力控制方式的独立流量控制液压系统 - Google Patents

挖掘机用压力控制方式的独立流量控制液压系统 Download PDF

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CN104379846A
CN104379846A CN201380028549.5A CN201380028549A CN104379846A CN 104379846 A CN104379846 A CN 104379846A CN 201380028549 A CN201380028549 A CN 201380028549A CN 104379846 A CN104379846 A CN 104379846A
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control
actuator
pressure
hydraulic
proportional control
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崔林局
申东斌
朴泰成
李钟赞
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HD Hyundai Heavy Industries Co Ltd
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Hyundai Heavy Industries Co Ltd
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    • 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
    • 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
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/162—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • 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
    • F15B11/006—Hydraulic "Wheatstone bridge" circuits, i.e. with four nodes, P-A-T-B, and on-off or proportional valves in each link
    • 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
    • F15B2211/30—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
    • F15B2211/30575—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 in a Wheatstone Bridge arrangement (also half bridges)
    • 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
    • F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/35—Directional control combined with flow control
    • F15B2211/351—Flow control by regulating means in 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
    • F15B2211/30—Directional control
    • F15B2211/35—Directional control combined with flow control
    • F15B2211/353—Flow control by regulating means in return line, i.e. meter-out control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/51—Pressure control characterised by the positions of the valve element
    • F15B2211/513—Pressure control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • 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
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6346—Electronic controllers using input signals representing a state of input means, e.g. joystick position
    • 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
    • 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
    • F15B2211/6652—Control of the pressure source, e.g. control of the swash plate angle
    • 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
    • F15B2211/6654—Flow rate control

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

Abstract

本发明涉及挖掘机用压力控制方式的独立流量控制液压系统，其目的在于提供一种挖掘机用压力控制方式的独立流量控制液压系统，其在连接于促动器的各流路上设置电子比例控制阀，从而通过独立流量控制方式能够对挖掘机液压系统进行可变控制。本发明包括:压力控制方式液压泵,其为促动器提供液压油；多个促动器,其和液压泵连接并得到液压油的供应从而驱动作业装置；第一、二电子比例控制阀,其分别设置于从液压泵连接至各促动器的柱塞侧流路及负荷侧流路上；第三、四电子比例控制阀,其分别设置于从所述促动器连接至液压槽的柱塞侧流路及负荷侧流路上；控制器，其根据控制杆的操作量,控制液压泵及与各个促动器连接的第一、二、三、四电子比例控制阀,从而对流路的面积进行可变控制，由此，根据控制杆的操作量,通过第一、二、三、四电子比例控制阀,对流路的面积进行可变控制。

Description

挖掘机用压力控制方式的独立流量控制液压系统
技术领域
本发明涉及挖掘机用压力控制方式的独立流量控制液压系统，更为详细地，涉及一种挖掘机用压力控制方式的独立流量控制液压系统，其在促动器(actuator)控制所必需的各流路上全部设置电子比例控制阀，从而对流路的面积进行可变控制，由此大幅提高流量控制的自由度。
背景技术
现有挖掘机的液压系统，其在遥控阀RCV(Remote Control Valve)中立时，从泵(pump)中排出一定流量，并根据使所述流量流向槽(Tank)的旁通(By-pass)流路的有无，可大致分为存在旁通(By-pass)流路的空档通路系统(Open-Center Sys.)和不存在旁通(By-pass)流路的空档闭路系统(Closed-Center Sys.)，并且进一步地，空档通路系统(Open-Center Sys.)分为负流量控制系统(Negative Flow Control Sys.)和正流量控制系统(Positive Flow Control Sys.)，而空档闭路系统(Closed-CenterSys.)则以负荷传感器系统(Load Sensing Sys.)为代表，且分别具有如下特征。
1)负流量控制系统(Negative Flow Control System)
图1表示现有的负流量控制系统，负流量控制系统(Negative Flow Control System)作为一种控制方式，其通过旁通(By-pass)流路的压力PN的变化来控制泵(Pump)的排量，所述旁通(By-pass)流路的压力PN根据旁通(By-pass)流路的流量变化而变化。
图1的可变节流口(Orifice)A1、A2、A3的面积的值根据一个线轴(spool)上切口(Notch)加工来决定，根据线轴的位移其相对值的比率相互约束并变化。以根据其中A2的面积和负荷而变化的负荷压力PL为依据，经过旁通(By-pass)流路80的流量发生变化，从而使旁通(By-pass)流路上的压力PN变化，变化的PN通过负(Negative)流路传递到泵，以控制泵的排量。
2)正流量控制系统(Positive Flow Control System)
图2表示现有的正流量控制系统，正流量控制系统(Positive Flow Control Sys.)作为一种控制方式，其根据遥控阀(RCV，Remote Control Valve)二次压力P2来控制泵排量。根据驾驶员的遥控阀(RCV)操作，遥控阀(RCV)的二次压力P2发生变化，根据以此决定的线轴的位移，可变节流口(Orifice)A1、A2、A3的面积对应线轴位移根据切口(Notch)加工时确定的相互约束的比例而变化。但是和负流量控制系统(Negative FlowControl System.)不同，泵的排量根据遥控阀(RCV)二次压力P2来控制，并且旁通(By-pass)流路80上的压力PN无法传递到泵，因此不参与泵的流量控制。
3)负荷传感器系统(Load Sensing System)
图3表示现有的负荷传感器系统,负荷传感器系统(Load Sensing Sys.)作为一种控制方式,其通过可变节流口(Orifice)A1、A2的面积和节流口(Orifice)前/后端的压力差dP1(PL1-PA1)来控制泵的流量。根据驾驶员的遥控阀(RCV)操作，遥控阀(RCV)的二次压力P2发生变化，根据以此决定的线轴的位移，可变节流口(Orifice)A1、A2的面积对应线轴位移根据切口(Notch)加工时确定的相互约束的比例而变化。此时利用压力补偿阀,从而将可变节流口A1的前/后端压力差维持为预先设定(setting)的一定的值,此时,泵的流量由经过压力补偿阀使PA1产生的泵压力PP和负荷压力PL来决定。当负荷压力不同的多个促动器同时运作时，通过止回阀(check valve)选择其中更大的负荷压力，从而决定泵的流量。
所述现有的系统中基本上一个线轴承接一个促动器,并通过所述线轴上机械加工的各切口(notch),来同时控制连接于相应线轴承接的促动器的各流路的面积及流量,因此，存在如下方面的问题：无法高效地应对负荷的大小、方向、重力能能否利用等各种使用环境的变化，并且其表现为根据挖掘机驾驶员个人驾驶习惯及喜好的挖掘机操作性变更对应限制，从而给驾驶员带来了不便，并且限制系统的流量控制的自由度，进而限制能量效率改善。
先行技术文献
(专利文献1)公开专利公报公开号10-2009-0059180(2009.06.11)
(专利文献2)登记专利公报登记号10-0651695(2006.11.23)
发明内容
本发明的目的在于提供一种挖掘机用压力控制方式的独立流量控制液压系统，其在连接于促动器(actuator)的各流路上设置电子比例控制阀，从而通过独立流量控制方式对挖掘机液压系统进行可变控制。
本发明的目的在于提供一种挖掘机用压力控制方式的独立流量控制液压系统，其在挖掘机液压系统中设置有压力控制方式泵，并能够将挖掘机液压系统实现为空档闭路(Closed Center)系统。
本发明包括:压力控制方式液压泵,其为促动器提供液压油(hydraulic fluid)；多个促动器,其和液压泵连接并得到液压油的供应从而驱动作业装置；第一、二电子比例控制阀,其分别设置于从液压泵连接至各促动器的柱塞(piston)侧流路及负荷(load)侧流路上；第三、四电子比例控制阀,其分别设置于从所述促动器连接至液压槽(tank)的柱塞(piston)侧流路及负荷侧流路上；控制器,其根据控制杆(joystick)的操作量，控制液压泵及和各促动器连接的第一、二、三、四电子比例控制阀,从而对流路的面积进行可变控制。
本发明在驱动作业装置的多个促动器的控制所需的各流路上设置有电子比例控制阀，从而根据控制杆(joystick)的操作量分别控制各电子比例控制阀,由此可控制(独立流量控制)流路及流量,因而具有如下效果：可大幅提升挖掘机等建设重装备的流量控制的自由度。
本发明通过提升建设重装备的流量控制的自由度,以减少驾驶员的不便，并可期待燃料费用改善的效果。
本发明设置为在驱动作业装置的促动器的入口侧流路和出口侧流路上,各电子比例控制阀通过控制器联动,从而可有效确保作业者所需的操作性能(操作装置的速度),并且当作业装置进行复合操作时，不需要设置用于促动器的可变速度操作的额外的阀门装置。
本发明设置有根据控制杆(joystick)的操作量在控制器中控制压力的压力控制方式的液压泵,通过电子比例控制阀来控制流入至各促动器的流路及流量,因此具有如下效果:实现在控制杆(joystick)中立时,从泵中不仅不排出一定流量,而且没有旁通(By-pass)流路的空档闭路系统(Closed Center)。
附图说明
图1是表示现有的负流量控制系统(Negative Flow Control System)的示例图。
图2是表示现有的正流量控制系统(Positive Flow Control System)的示例图。
图3是表示现有的负荷传感器系统(Load Sensing System)的示例图。
图4是表示根据本发明的结构的示例图。
符号说明
10:促动器(actuator)          20:液压泵
31:柱塞(piston)侧入口流路   32:负荷(load)侧入口流路
33:柱塞(piston)侧出口流路   34:负荷(load)侧出口流路
41:第一电子比例控制阀  42:第二电子比例控制阀
43:第三电子比例控制阀  44:第四电子比例控制阀
50:液压槽   60：控制杆(joystick)
70：控制器
具体实施方式
图4是表示根据本发明的结构的示例图,本发明包括有:多个促动器(actuator)10,其对作业装置进行驱动；压力控制方式液压泵20,其为促动器10提供液压油(hydraulicfluid)；第一、二电子比例控制阀41、42,其分别设置于从液压泵20连接至各促动器10的柱塞(piston)侧入口流路31及负荷(load)侧入口流路32上；第三、四电子比例控制阀43、44,其分别设置于从促动器10连接至液压槽(tank)50的柱塞(piston)侧出口流路33及负荷(load)侧出口流路34上；控制器70,其根据控制杆(joystick)60的操作量,控制连接于各个促动器10的第一、二、三、四电子比例控制阀41、42、43、44,从而对流路的面积进行可变控制。
所述液压泵20作为压力控制方式液压泵,依靠发动机来驱动，向多个促动器供应液压油,所述液压泵20的排量根据控制器70来控制。
所述促动器10用于驱动各种作业装置(未示出),依靠柱塞(piston)侧入口流路31及负荷(load)侧入口流路32与液压泵20连接,依靠柱塞(piston)侧出口流路33及负荷(load)侧出口流路34与液压槽50连接。所述促动器10具备有多个。
所述第一电子比例控制阀41设置于柱塞(piston)侧入口流路31，所述第二电子比例控制阀42设置于负荷(load)侧入口流路32；所述第三电子比例控制阀43设置于柱塞(piston)侧出口流路33；所述第四电子比例控制阀44设置于负荷(load)侧出口流路34。
所述第一、二、三、四电子比例控制阀41、42、43、44分别设置于各促动器10所连接的流路上,并与控制器70连接,从而根据控制杆(joystick)60的操作量得到控制。
所述控制器70与控制杆连接并输入控制杆60的操作量信息,根据所述输入的操作量信息,依靠预先输入的运算法则(algorithm),控制与各促动器10连接的第一、二、三、四电子比例控制阀41、42、43、44及压力控制方式液压泵20,进而控制驱动器10的速度。
如上所述地构成的本发明由各个促动器10为第一、二、三、四电子比例控制阀41、42、43、44所控制的独立流量控制构成,并实现在控制杆中立时,不从泵排出一定流量且没有旁通(By-pass)流路的空档闭路系统(Closed-Center System)。
所述构成的本发明中,如果驾驶员操作控制杆(RCV),则同时驱动促动器数字及控制杆(RCV)操作量信息被输入,并根据预先输入的运算法则(algorithm)来决定各促动器的速度,通过控制器来控制第一、二、三、四电子比例控制阀及压力控制方式的泵,进而控制支配促动器运动的可变节流口的面积及可变节流口前/后端的压力差,由此实现根据操作者指示的促动器的目标速度。
本发明并非限定于所述优选的实施例,并且在不脱离权利要求书中请求的本发明的要旨的情况下,在本发明所属技术领域内,具有一般知识的技术人员能够进行各种变形实施,并且此变形属于本权利要求记载的范围。

Claims (1)

1.一种挖掘机用压力控制方式的独立流量控制液压系统,其特征在于，包括:
多个促动器(10),其驱动作业装置；
压力控制方式液压泵(20),其为促动器(10)提供液压油；
第一、二电子比例控制阀(41、42),其分别设置于从液压泵(20)连接至各促动器(10)的柱塞侧入口流路(31)及负荷侧入口流路(32)上；
第三、四电子比例控制阀(43、44),其分别设置于从促动器(10)连接至液压槽(50)的柱塞侧出口流路(33)及负荷侧出口流路(34)上；
控制器(70),其根据控制杆(60)的操作量,控制连接于各促动器(10)的第一、二、三、四电子比例控制阀(41、42、43、44),从而对流路的面积进行可变控制，
由此，根据控制杆的操作量,通过第一、二、三、四电子比例控制阀,对流路的面积进行可变控制。
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