CN101457778B - 具有外部先导压力操作型闭锁阀的液压回路 - Google Patents
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Abstract
提供一种具有外部先导压力操作型闭锁阀的液压回路,能使为防止致动器因主控制阀的液压流体泄漏而推进所安装的双止回阀,由为移位主控制阀而供应的外部先导信号压力打开。该液压回路包括:与发动机相连的液压泵和先导泵;与液压泵相连的液压缸以当液压流体供应其中时而伸缩;主控制阀,安装在液压泵与液压缸间的流动路径中,并移位以控制液压缸的起动、停止和方向改变;操纵杆,根据使用者的操纵量输出来自先导泵的先导信号压力;双止回阀,安装在主控制阀与液压缸间的流动路径中以由用于移位主控制阀的先导信号压力打开,防止液压缸因主控制阀的液压流体泄漏而移动;和选择阀,响应根据操纵杆的操纵供应的先导信号压力而移位,以打开双止回阀。
Description
相关申请的交叉引用
本申请基于并要求于2007年12月10日提交于韩国知识产权局的申请号为10-2007-0127657的韩国专利申请的优先权,该在先申请的全部公开内容通过引用并入本文。
技术领域
本发明涉及一种具有外部先导压力操作型闭锁阀的液压回路,其能够防止或减弱致动器(例如,液压缸等)因控制供给该致动器液压流体的主控制阀的液压流体泄漏所致的推进现象(push phenomenon)。
更具体而言,本发明涉及一种具有外部先导压力操作型闭锁阀的液压回路,其能使为防止致动器因主控制阀的液压流体泄漏而致推进所安装的双止回阀,由为移位主控制阀而供应的外部信号压力来打开。
背景技术
如图1所示,传统的液压回路包括:与发动机(未示出)相连的液压泵p,和先导泵Pp;液压缸1,其与液压泵p相连以操作诸如悬臂等作业装置;主控制阀2,其安装在液压泵p与液压缸1之间的流动路径中,并响应从先导泵Pp供应的先导信号压力而移位,以控制液压缸1的起动、停止和方向改变;以及操纵杆11,其根据使用者对它的操纵量将先导信号压力从先导泵Pp供应至主控制阀2。
在附图中,附图标记“R”表示安装在先导泵Pp的流动路径中的安全阀,如果超过在先导信号线路中设定的压力的过载出现,则该安全阀通过将液压流体的一部分排放至液压箱来保护液压系统。
当液压缸1停止时,液压流体通过主控制阀2的阀芯间隙泄漏(即,液压流体的泄漏通过安装在主控制阀2中的阀芯的间隙而发生,其中主控制阀2根据从外部供给主控制阀2的先导信号压力而被移位),并由此使液压缸1推进,从而导致违背使用者意愿的安全事故发生。
如图2所示,另一传统的具有内部先导信号压力操作型闭锁阀的液压回路包括:分别与发动机(未示出)相连的液压泵p和先导泵Pp;液压缸1,其与液压泵p相连以操作诸如悬臂等作业装置;主控制阀2,其安装在液压泵p与液压缸1之间的流动路径中,并响应从外部供应的先导信号压力而移位,以控制液压缸1的起动、停止和方向改变;操纵杆11,其根据使用者对它的操纵量将先导信号压力从先导泵Pp供应至主控制阀2;以及双止回阀3(包括分别安装在流动路径中的止回阀4和阀簧5,以用作闭锁阀),其安装在主控制阀2与液压缸1之间的流动路径中,以由供应给液压缸1的液压力来打开/关闭,并防止液压缸因通过主控制阀2的阀芯间隙的液压流体泄漏而被推进。
此时,主控制阀2的阀芯被形成为,当该阀芯在中性状态时与液压箱相连,以防止止回阀4因主控制阀的反压力(back pressure)而被打开。
如果阀簧5的回弹力大于预置值,则止回阀4易于被供给液压缸1的液压力打开,并由此释放大量的液压流体。因此,如果主控制阀2的反压力增大,则止回阀4被打开,从而导致液压缸1的推进现象发生。
相反,如果阀簧5的回弹力小于预置值,则止回阀4在供给液压缸1的液压力达到预定压力值之后才被打开。因此,难以灵敏地操纵作业装置,从而降低操纵性,并且这可导致液压缸1的突然操作。
而且,止回阀4在特定作业条件下重复即时的打开/关闭操作,并由此发生抖动现象,从而导致剧烈的振动和噪声。
发明内容
因此,本发明致力于解决出现在现有技术中的上述问题,同时使现有技术实现的优点依然保持不受触动。
本发明的一个目的在于提供一种具有外部先导压力操作型闭锁阀的液压回路,其可使为防止致动器因主控制阀中的液压流体泄漏而致推进所安装的双止回阀,由为移位主控制阀而供应的外部信号压力来打开。
为了实现这些目的,提供一种具有外部先导压力操作型闭锁阀的液压回路,根据本发明实施例,该液压回路包括:分别与发动机相连的液压泵和先导泵;与所述液压泵相连的液压缸,以当液压流体供至该液压缸时进行伸展和收缩;主控制阀,其安装在所述液压泵与所述液压缸之间的流动路径中,并被移位以控制所述液压缸的起动、停止和方向改变;操纵杆,其根据使用者对它的操纵量输出来自所述先导泵的先导信号压力;双止回阀,其安装在所述主控制阀与所述液压缸之间的流动路径中,以由用于移位所述主控制阀的先导信号压力来打开,并防止所述液压缸因所述主控制阀的液压流体泄漏而移动;以及选择阀,其响应根据所述操纵杆的操纵供应的所述先导信号压力而移位,以打开所述双止回阀。
根据本发明实施例的液压回路可进一步包括梭阀,其安装在所述选择阀和所述主控制阀的先导信号线路的交汇点处,以选择被供应至所述主控制阀的信号压力中的高压,从而伸展或收缩所述液压缸。
所述双止回阀和所述选择阀可被形成为一体。
所述双止回阀和所述选择阀可被单独形成然后装配在一起。
所述双止回阀的阀簧的回弹力可被设定为大于由所述止回阀的两端之间的压力差产生的力,以便防止当所述主控制阀中产生反压力时所述止回阀被打开。
附图说明
本发明的以上和其它目的、特征和优点,通过以下结合附图的详细描述将更为显而易见,其中:
图1是传统液压回路的回路示意图;
图2是另一传统的具有内部先导压力操作型闭锁阀的液压回路的回路示意图;以及
图3是根据本发明实施例的具有外部先导压力操作型闭锁阀的液压回路的回路示意图。
具体实施方式
在下文中,将参照附图描述本发明的优选实施例。在说明书中所限定的内容,例如详细的结构和元件,只不过是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,因而本发明并不限于此。
如图3所示,根据本发明实施例的具有外部先导压力操作型闭锁阀的液压回路包括:分别与发动机(未示出)相连的液压泵p和先导泵Pp;液压缸1,其与液压泵p相连以操作诸如悬臂等作业装置;主控制阀2,其安装在液压泵p与液压缸1之间的流动路径中,并且响应从先导泵Pp供应的先导信号压力而移位,以控制液压缸1的起动、停止和方向改变;操纵杆11,其根据使用者对它的操纵量输出来自先导泵Pp的先导信号压力(即,二次压力);双止回阀6(包括止回阀8和阀簧9,以用作闭锁阀),其安装在主控制阀2与液压缸1之间的流动路径中,以由用于移位主控制阀2的先导信号压力来打开,并防止液压缸1因主控制阀2的液压流体泄漏而被移动;以及选择阀7,其响应根据操纵杆11的操纵从先导泵Pp供应的先导信号压力而被移位,以打开双止回阀6的止回阀8。
根据本发明实施例的液压回路进一步包括:梭阀10,其安装在选择阀7和主控制阀2的先导信号线路7a、2a和2b的交汇点处,以选择供应至主控制阀2的信号压力中的高压,从而伸展或收缩液压缸1。
双止回阀6和选择阀7形成为一体。
双止回阀6和选择阀7单独形成然后装配在一起。
双止回阀6的阀簧9的回弹力被设定为大于由止回阀8的两端之间的压力差产生的力,以防止当主控制阀2中产生反压力时止回阀8被打开。
在下文中,将参照附图描述根据本发明实施例的具有外部先导压力操作型闭锁阀的液压回路的操作。
A)在液压缸未被操作的情况下(在此情况下,主控制阀2保持在中性状态)
如图3所示,因为用于通过选择阀7的阀芯(处于如图3所示的状态)来打开止回阀8的先导信号线路与液压箱T相连,所以施加至止回阀8的信号压力被降低至大气压力水平。
此时,由于阀簧9的回弹力被设定为大于由止回阀8的两端之间的压力差产生的力,所以即使在主控制阀2中形成很高的反压力,双止回阀6的止回阀8依然被防止由阀簧9打开。
B)在液压缸被操作的情况下(在此情况下,主控制阀2被先导信号压力移位)
如图3所示,来自先导泵Pp的先导信号压力根据操纵杆11的操纵被供应至梭阀10,并且同时,通过先导信号线路2a和2b供应至主控制阀2的先导信号压力也被供应至梭阀10。
因此,供应至主控制阀2以伸展或收缩液压缸1的信号压力中的高压由梭阀10来选择。由梭阀10选择的信号压力通过先导信号线路7a供应至选择阀7,以沿如图所示的左侧方向移位内部阀芯。
因此,当来自液压泵p的液压流体经过主控制阀2供给液压缸1以伸展或收缩液压缸1时,来自先导泵Pp的先导信号压力同时通过被移位的选择阀7供应至一对止回阀8,以打开止回阀8。
此时,止回阀8由从先导泵Pp供应的用于移位主控制阀2的先导信号压力打开(在传统的液压回路中,止回阀由供给液压缸1的液压力打开)。因此,改善了作业装置的操纵性,并防止了因止回阀8的重复打开/关闭操作所致的噪声和振动。
如上所述,根据本发明实施例的具有外部先导压力操作型闭锁阀的液压回路具有以下优点。
由于为防止致动器因主控制阀中的液压流体泄漏而推进所安装的双止回阀,由为移位主控制阀而供应的外部先导信号压力来打开,因此改善了作业装置的操纵性,从而提高了工作效率,并防止了因振动和噪声所致的抖动现象,从而提高了设备的可靠性。
尽管出于示例目的对本发明的优选实施例进行了描述,但本领域技术人员应当理解,在不背离由所附权利要求所公开的本发明的范围和精神的情况下,可以进行各种修改、增加和替换。
Claims (5)
1.一种具有外部先导压力操作型闭锁阀的液压回路,包括:
分别与发动机相连的液压泵和先导泵;
与所述液压泵相连的液压缸;
主控制阀,其安装在所述液压泵与所述液压缸之间的流动路径中,并被移位以控制所述液压缸的起动、停止和方向改变;
操纵杆,其根据使用者对它的操纵量输出来自所述先导泵的先导信号压力;
双止回阀,其安装在所述主控制阀与所述液压缸之间的流动路径中,以由用于移位所述主控制阀的先导信号压力来打开,并防止所述液压缸因所述主控制阀的液压流体泄漏而移动;以及
选择阀,其响应根据所述操纵杆的操纵供应的所述先导信号压力而移位,以打开所述双止回阀。
2.根据权利要求1所述的液压回路,进一步包括梭阀,其安装在所述选择阀和所述主控制阀的先导信号线路的交汇点处,以选择被供应至所述主控制阀的信号压力中的高压,从而伸展或收缩所述液压缸。
3.根据权利要求1所述的液压回路,其中所述双止回阀和所述选择阀被形成为一体。
4.根据权利要求1所述的液压回路,其中所述双止回阀和所述选择阀被单独形成然后装配在一起。
5.根据权利要求1至4中任一项权利要求所述的液压回路,其中,所述双止回阀包括止回阀和阀簧,所述双止回阀的所述阀簧的回弹力被设定为大于由所述止回阀的两端之间的压力差产生的力,以便防止当所述主控制阀中产生反压力时所述止回阀被打开。
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EP2071195B1 (en) | 2017-05-03 |
KR20090060732A (ko) | 2009-06-15 |
EP2071195A3 (en) | 2012-11-21 |
EP2071195A2 (en) | 2009-06-17 |
JP2009138938A (ja) | 2009-06-25 |
US20090145123A1 (en) | 2009-06-11 |
US8146482B2 (en) | 2012-04-03 |
KR100956999B1 (ko) | 2010-05-11 |
CN101457778A (zh) | 2009-06-17 |
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