CN103459858B - 用于控制施工设备动臂的液压回路 - Google Patents
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- 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
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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
- 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
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
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- 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
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- 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
- E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
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- 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
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
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- 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
- E02F9/2271—Actuators and supports therefor and protection therefor
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- 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
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/003—Systems with load-holding valves
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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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/007—Overload
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
- F15B2211/30515—Load holding valves
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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
- 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
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/355—Pilot pressure control
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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
- 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
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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
- 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
- F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a return line
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5159—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a return line
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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
- 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
- F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
- F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel
Abstract
本发明公开一种用于控制施工设备动臂的液压回路,其中,从动臂油缸大室释放的工作油经过节流孔,以当动臂未操作时,如果施加超负荷,防止动臂下降。用于控制施工设备动臂的液压回路包括:动臂油缸,其经由第一路径和第二路径连接到液压泵;动臂控制阀,其安装在液压泵与动臂油缸之间的路径上;保持阀,其安装在动臂控制阀与动臂油缸的第一路径之间,并当动臂控制阀处于中性位置时,防止动臂自然下降;端口减压阀,其在保持提升阀的下部侧安装到第一路径,并当在第一路径产生超负荷时使工作油减压;以及阻尼阀,其安装在端口减压阀的下部侧,当动臂控制阀是中性时减缓经过端口减压阀的工作油,以通过节流孔减缓工作油,并在由于施加到动臂控制阀的动臂上升先导信号压力引起转化时,使经过端口减压阀的工作油排放到液压箱。
Description
技术领域
本发明涉及一种用于控制施工机械动臂的液压回路。更具体地,本发明涉及一种用于控制施工机械动臂的液压回路,其中,当在动臂未操纵的状态下,超负荷施加到动臂油缸时,从动臂油缸大室释放的液压流体经过节流孔,以便操作员可缓和动臂的突然下降运动。
背景技术
如图1所示,根据现有技术的用于控制施工机械动臂的常规液压回路包括:
液压泵1,液压泵1连接到发动机(未示出);
动臂油缸2,动臂油缸2通过第一路径(或动臂油缸大室侧的流动路径)2a和第二路径(或动臂油缸小室侧的流动路径)2b连接到液压泵1;
动臂控制阀3,动臂控制阀3可切换地安装在设置在液压泵1与动臂油缸2之间的流动路径中,并配置为被切换,以控制动臂油缸2的启动、停止、和换向;
保持阀6,保持阀6包括保持提升阀4和排液阀5,保持提升阀4安装在动臂控制阀3与动臂油缸2的第一流动路径2a之间,排液阀5配置为给保持提升阀4的背压室4a提供液压流体或从保持提升阀4的背压室4a排放液压流体,以便当动臂控制阀3处于中性状态时,防止由于流体泄露、空车重量等引起的动臂自然下降运动;以及
端口减压阀7,端口减压阀7在保持提升阀4的下游侧安装在第一路径2a中,并配置为当第一路径2a中发生超负荷时将液压流体排放到液压箱(未示出)。
在这种常规液压回路的情况下,当在动臂未操纵的状态下,超负荷沿动臂下降或降低的方向施加到动臂油缸2时,超过端口减压阀7预定压力的超负荷施加到安装在第一路径2a中的端口减压阀7,以便动臂油缸2大室侧的液压流体通过端口减压阀7排放到液压箱(未示出)。因此,常规液压回路引起的问题是,由于动臂的突然下降运动可能发生安全事故。
发明内容
技术问题
因此,本发明旨在解决现有技术中出现的上述问题,并且本发明的目的是提供一种用于控制施工机械动臂的液压回路,其中,当在动臂未操纵的状态下,超负荷施加到动臂油缸时,动臂油缸大室侧的液压流体经过节流孔然后减缓,以便操作员可缓和动臂的突然下降运动。
技术方案
为了实现以上目的,根据本发明,提供一种用于控制施工机械动臂的液压回路,包括:
液压泵,所述液压泵连接到发动机;
动臂油缸,所述动臂油缸通过第一路径和第二路径连接到液压泵;
动臂控制阀,所述动臂控制阀可切换地安装在设置在液压泵与动臂油缸之间的流动路径中,并配置为被切换,以控制动臂油缸的启动、停止、和换向;
保持阀,所述保持阀包括保持提升阀和排液阀,保持提升阀安装在动臂控制阀与动臂油缸的第一流动路径之间,排液阀配置为给保持提升阀的背压室提供液压流体或从保持提升阀的背压室排放液压流体,以便当动臂控制阀处于中性状态时,防止动臂的自然下降运动;
端口减压阀,所述端口减压阀在保持提升阀的下游侧安装在第一路径中,并配置为当第一路径中发生超负荷时使液压流体减压;以及
阻尼阀,所述阻尼阀安装在端口减压阀的下游侧,并配置为当动臂控制阀处于中性状态时,经过端口减压阀的液压流体经过节流孔以减缓液压流体,并当动臂控制阀被施加到其上的动臂上升先导信号压力切换时,经过端口减压阀7的液压流体排放到液压箱。
根据更优选的实施例,阻尼阀被动臂上升先导信号压力切换,所述动臂上升先导信号压力由用于操纵工作装置的远程控制阀的杆操纵产生。
有益效果
如以上配置的根据本发明实施例的用于控制施工机械动臂的液压回路具有以下优点。
当在动臂未操纵的状态下超负荷或恒定负荷施加到动臂油缸时,在进行臂的伸出操作情况下,动臂油缸大室侧的液压流体经过节流孔然后减缓,以便可缓和动臂的下降运动,因此操作员可防止突然的安全事故,由此确保稳定性和可靠性。
附图说明
图1是示出根据现有技术的用于控制施工机械动臂的液压回路的线路图;以及
图2是示出根据本发明实施例的用于控制施工机械动臂的液压回路的线路图。
图中主要元件的参考符号说明
1:液压泵
2:动臂油缸
3:动臂控制阀
4:保持提升阀
5:排液阀
6:保持阀
7:端口减压阀
8:节流孔
9:阻尼阀
10:远程控制阀(RCV)
具体实施方式
现在将结合附图详细描述本发明的优选实施例。在说明书中所限定的物质,例如具体的结构和元件,仅仅是为帮助本领域普通技术人员全面理解本发明而提供的具体细节,而本发明并不限于下文中所公开的实施例。
如图2所示,根据本发明实施例的用于控制施工机械动臂的液压回路包括:
液压泵1,液压泵1连接到发动机(未示出);
动臂油缸2,动臂油缸2通过第一路径(或动臂油缸大室侧的流动路径)2a和第二路径(或动臂油缸小室侧的流动路径)2b连接到液压泵1;
动臂控制阀3,动臂控制阀3可切换地安装在设置在液压泵1与动臂油缸2之间的流动路径中,并配置为被切换,以控制动臂油缸2的启动、停止、和换向;
保持阀6,保持阀6包括保持提升阀4和排液阀5,保持提升阀4安装在动臂控制阀3与动臂油缸2的第一流动路径2a之间,排液阀5配置为给保持提升阀4的背压室4a提供液压流体或从保持提升阀4的背压室4a排放液压流体,以便当动臂控制阀3处于中性状态时,防止动臂的自然下降运动;
端口减压阀7,端口减压阀7在保持提升阀4的下游侧安装在第一路径2a中,并配置为当第一路径2a中发生超负荷时使液压流体减压;以及
阻尼阀9,阻尼阀9安装在端口减压阀7的下游侧,并配置为当动臂控制阀3处于中性状态时,经过端口减压阀7的液压流体经过节流孔8以减缓液压流体,并当动臂控制阀3被施加到其上的动臂上升先导信号压力切换时,经过端口减压阀7的液压流体排放到液压箱(未经过节流孔)。
在此情况下,阻尼阀9被动臂上升先导信号压力切换,所述动臂上升先导信号压力由用于操纵工作装置的远程控制阀(RCV)的杆操纵产生。
同时,当动臂控制阀3处于中性状态时,使经过端口减压阀7的液压流体经过节流孔8,以降低液压流体排放到液压箱的排放速率。当动臂控制阀3被施加到动臂控制阀3的动臂上升先导信号压力切换时,经过端口减压阀7的液压流体直接排放到液压箱。同样,不包括节流孔8的配置基本上与图1所示的液压回路的配置相同,因此为了避免冗长,将省略其配置和操作的详细描述。相同参考符号表示相同元件。
在下文将结合附图详细描述根据本发明实施例的用于控制施工机械动臂的液压回路的使用实例。
如图2所示,当在动臂未操纵的状态下,即,动臂控制阀3处于中性状态,超负荷沿动臂下降的方向施加动动臂油缸2时,超过预定压力的压力施加到安装在动臂油缸2的第一路径2a中的端口减压阀3,因此端口减压阀3将液压流体排到液压箱。在此情况下,经过端口减压阀7之后减压的液压流体经过安装在端口减压阀7下游侧的阻尼阀9的节流孔8,然后排放到液压箱(见图2),以使返回液压箱的液压流体的排放速率可降低。为此,操作员可缓和动臂突然下降的下降速率,由此确保稳定性。
相反,动臂上升先导信号压力通过远程控制阀(RCV)的杆操纵提供给动臂控制阀3,以操纵诸如动臂的工作装置,以使动臂控制阀3的阀芯切换到图纸上的右侧。同时,一部分动臂上升先导信号压力施加到阻尼阀9的信号压力接收部,以使阀芯在图纸上向上切换。
因此,从液压泵1排放的液压流体经由第一路径2a,通过保持提升阀4提供给动臂油缸2,从而使动臂油缸以伸展的方式被驱动,以提升或抬起动臂。在此情况下,当在动臂油缸2中发生超负荷时,超过预定压力的超负荷施加到安装在第一路径2a中的端口减压阀7,以使流入第一路径2a中的液压流体经过端口减压阀7,然后排放到液压箱。此时,经过端口减压阀7之后减压的液压流体立即经过阻尼阀9,然后排放到液压箱。换句话说,当动臂油缸2以伸展的方式被驱动以使超负荷发生时,经过端口减压阀7的液压流体可迅速排放到液压箱。
工业应用性
如上所述,按照根据本发明实施例的用于控制施工机械动臂的液压回路,当在动臂未操纵的状态下超负荷施加到动臂油缸时,动臂油缸大室侧的液压流体经过节流孔然后减缓,以便可缓和动臂的下降运动,因此操作员可防止突然的安全事故。
Claims (2)
1.一种用于控制施工机械动臂的液压回路,包括:
液压泵,所述液压泵连接到发动机;
动臂油缸,所述动臂油缸通过第一路径和第二路径连接到所述液压泵;
动臂控制阀,所述动臂控制阀可切换地安装在设置在所述液压泵与所述动臂油缸之间的流动路径中,并配置为被切换,以控制所述动臂油缸的启动、停止、和换向;
保持阀,所述保持阀包括保持提升阀和排液阀,所述保持提升阀安装在所述动臂控制阀与所述动臂油缸的第一流动路径之间,所述排液阀配置为给所述保持提升阀的背压室提供液压流体或从所述保持提升阀的背压室排放液压流体,以便当所述动臂控制阀处于中性状态时,防止所述动臂的自然下降运动;
端口减压阀,所述端口减压阀在所述保持提升阀的下游侧安装在所述第一路径中,并配置为当所述第一路径中发生超负荷时使液压流体减压;以及
阻尼阀,所述阻尼阀安装在所述端口减压阀的下游侧,并配置为当所述动臂控制阀处于中性状态时,经过所述端口减压阀的液压流体经过节流孔,以减缓液压流体,并当所述动臂控制阀被施加到其上的动臂上升先导信号压力切换时,经过所述端口减压阀的液压流体排放到液压箱。
2.如权利要求1所述的用于控制施工机械动臂的液压回路,其中,所述阻尼阀被动臂上升先导信号压力切换,所述动臂上升先导信号压力由用于操纵工作装置的远程控制阀的杆操纵产生。
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US10001146B2 (en) | 2013-01-18 | 2018-06-19 | Volvo Construction Equipment Ab | Flow control device and flow control method for construction machine |
CN104981615B (zh) | 2013-02-19 | 2017-11-10 | 沃尔沃建造设备有限公司 | 用于设置有保护装置的工程机械的液压系统 |
KR20160023710A (ko) | 2013-06-28 | 2016-03-03 | 볼보 컨스트럭션 이큅먼트 에이비 | 플로팅기능을 갖는 건설기계용 유압회로 및 플로팅기능 제어방법 |
WO2016093378A1 (ko) * | 2014-12-08 | 2016-06-16 | 볼보 컨스트럭션 이큅먼트 에이비 | 건설기계용 유량 제어장치 |
CN111868338B (zh) * | 2018-03-22 | 2022-07-26 | 住友重机械工业株式会社 | 挖土机 |
DE102020212201B4 (de) * | 2020-09-28 | 2022-12-01 | Hawe Hydraulik Se | Separates hydraulisches Dämpfungsmodul und Lasthalteventil mit separatem hydraulischen Dämpfungsmodul |
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EP2700827A1 (en) | 2014-02-26 |
US20140010688A1 (en) | 2014-01-09 |
EP2700827A4 (en) | 2015-03-11 |
JP5832634B2 (ja) | 2015-12-16 |
KR20140010414A (ko) | 2014-01-24 |
CN103459858A (zh) | 2013-12-18 |
US9482214B2 (en) | 2016-11-01 |
JP2014512497A (ja) | 2014-05-22 |
WO2012144665A1 (ko) | 2012-10-26 |
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