力士乐插装阀控制盖板LFA16GWA-71/A10P10

力士乐插装阀控制盖板LFA16GWA-71/A10P10 R900912635，德国REXROTH插装阀控制盖板，购买进口液压、气动、自动化控制工业配件，认准“上海韦米机电设备有限公司”，7年老店，保证产品原厂原装，价格优惠，售后无忧，欢迎新老客户咨询采购！
 
二通插装阀是插装阀基本组件( 阀芯、阀套、弹簧和密封圈)插到特别设计加工的阀体内，配以盖板、先导阀组成的一种多功能的复合阀。因每个插装阀基本组件有且只有两个油口，故被称为二通插装阀，早期又称为逻辑阀。
1、二通插装阀的特点
二通插装阀具有下列特点:流通能力大，压力损失小，适用于大流量液压系统;主阀芯行程短，动作灵敏，响应快，冲击小;抗油污能力强，对油液过滤精度无严格要求;结构简单，维修方便，故障少，寿命长;插件具有一阀多能的特性，便于组成各种液压回路，工作稳定可靠，插件具有通用化、标准化、系列化程度很高的零件，可以组成集成化系统。
2、二通插装阀的组成
二通插装阀由插装元件、控制盖板、先导控制元件和插装块体四部分组成。图1是二通插装阀的典型结构
控制盖板用以固定插装件，安装先导控制阀，内装棱阀、溢流阀等。控制盖板内有控制油通道，配有一个或多个阻尼螺塞。通常盖板有五个控制油孔:X、Y、Z1、Z2和中心孔a。由于盖板是按通用性来设计的，具体运用到某个控制油路上有的孔可能被堵住不用。为防止将盖板装错，盖板上的定位孔，起标定盖板方位的作用。另外，拆卸盖板之前就必须看清、记牢盖板的安.装方法。
先导控制元件称作先导阀，是小通径的电磁换向阀。块体是嵌入插装元件，安装控制盖板和其它控制阀、沟通主油路与控制油路的基础阀体。插装元件由阀芯、阀套、弹簧以及密封件组成(图3 )。每只插件有两个连接主油路的通口，阀芯的正面称为A口;阀芯环侧面的称作B口。阀芯开启，A口和B口沟通;阀芯闭合，A口和B口之间中断。因而插装阀的功能等同于2位2通阀。故称二通插装阀，简称插装阀。

根据用途不同分为方向阀组件、压力阀组件和流量阀组件。同一通径的三种组件安装尺寸相同，但阀芯的结构形式和阀套座直径不同。三种组件均有两个主油口A和B、一个控制口x。
插装阀基本组件：1-阀套2-密封件3-阀芯4-弹簧5-盖板6-阻尼孔7-阀芯。

插装阀主要组合与功能
1、插装方向控制阀
插装阀可以组合成各式方向控制阀。
1)作单向阀
将x腔和A或B腔连通，即成为单向阀。连接方法不同，其导通方式也不同。若在控制盖板上如图5c连接一个二位三通液动换向阀，即可组成液控单向阀。
2)
作二位二通阀
二位三通阀，即可组成二位二通电液阀。
3)作二位三通阀
连接二位四通阀，即可组成二位三通电液换向阀。
4)作二位四通阀
连接二位四通阀，即可组成二位四通电液换向阀。
5)作三位四通阀0型换向阀
连接三位四通阀换向阀和单向阀，即可组成三位四通阀中位为0型电液换向阀。
6)作多机能四通阀
连接换向阀，利用对电磁换向阀的控制实现多机能功能。
2、插装压力控制阀
对插装阀的x腔进行压力控制，便可构成压力控制阀。
1)作溢流阀或顺序阀
在压力型插装阀芯的控制盖板上连接先导调压阀(溢流阀) ,当出油口接油箱，此阀起溢流阀作用;当出油口接另一工作油路，则为顺序阀。
2)作卸荷阀
连接二位二通换向阀，当电磁铁通电时，出口接油箱，则构成卸荷阀。
3)作减压阀
采用插装阀芯和溢流阀连接，则构成减压阀。液压油P从1流入P2流出，出口油液通过阀芯上的中心阻尼孔、盖板和先导阀接通。当减压阀出口的压力较小，不足以顶开先导阀芯时，主阀芯上的阻尼孔只起通油作用，使主阀芯上、下两腔的液压力相等，而上腔又有一个小弹簧作用，必使主阀芯处在F端极限位置，减压阀芯大开，不起减压作用; 当压力增大到先导阀的开启压力时，先导阀打开，泄漏油液单独流回油箱，实行外泄。减压阀在调定压力下正常工作时，由于出口压力与先导 阀溢流压力和主阀芯弹簧力的平衡作用，维持节流降压口为某定值。当出口压力增大，由于阻尼孔液流阻力的作用产生压力降，主阀芯所受的力不平衡，使阀芯上移，减小节流降压口，使节流降压作用增强;反之，出口的压力减小时，阀芯下移，增大节流降压口，使节流降压作用减弱，控制出口的压力维持在调定值。
3、插装流量控制阀
插装流量阀同样有节流阀和调速阀等型式。
1)作节流阀
在方向控制插装阀的盖板上安装阀芯行程调节器，调节阀芯和阀体间节流口的开度便可控制阀口的通流面积，起节流阀的作用，如图12a。实际应用时，起节流阀作用的插装阀芯一般采用滑阀结构，并在阀芯上开节流沟槽。
2)作调速阀
插装式节流阀同样具有随负载变化流量不稳定的问题。如果采取措施保证节流阀的进、出口压力差恒定，则可实现调速阀功能。如图12b连接的减压阀和节流阀就起到这样的作用。

液压机是对金属材料塑料、橡胶和粉末冶金制品进行压力加工的设备，在工业部门得到了广泛应用,如金属材料的拉伸、冲裁弯曲翻边冷挤压以及成型加工等，还用于校正、压装、粉末冶金制品和磨料制品的压制成型及塑料制品、绝缘材料的压制成型等。为完成上述工作,液压机应能产生较大的压力,因此,液压系统工作压力、尺寸和流量也大,对其设计要求也高,是较典型的高压大流量系统。①液压系统压力应能经常变换和调节,并能产生较大压力，以满足不同的工作要求。②空程速度大、加压时推力大,系统功率大,要求功率利用率高。③空程与压制时,其速度与压力相差甚大,所以多采用高低压泵组或恒功率变量泵供油系统.以满足低压快速行程和高压慢速行程要求。
力士乐插装阀控制盖板LFA16GWA-71/A10P10 R900912635
力士乐REXROTH二通插装阀、定向功能，控制盖板LFA..GWA
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液压系统的振动与噪声是一个相当普遍的问题。近年来，随着液压技术向高速、高压和大功率方面的发展,液压系统的振动和噪声也日趋严重，并且成为妨碍液压技术进--步发展的因素之-。
振动是弹性物的固有特性，振动会产生噪声，噪声源于振动，因此振动和噪声是液压系统不可分割的两种物理现象。
研究和分析液压系统振动与噪声的成因，对降低或控制振动和噪声，并改善液压系统的性能有着极其深远的意义。
液压系统的振动主要来自机械系统运动导致的振动、流体工作过程中产生的振动。

简单介绍液压系统中的机械振动

在液压系统中主要体现在电动机、液压泵、液压马达的转轴在高速运转时，会产生一种频率与转速相对应的受迫振动。这种振动会通过泵站基础或管路传递到其他管道、油箱和阀件，电动机、液压泵、液压马达在使用过程中，因磨损等原因使得配合间隙增大、轴承位置窜动等。因此将会产生高频振动，电机与泵的联轴器也会因两半轴的不同轴、偏斜过大产生与转速同频率的振动。
这些振动*常见的表现是液压系统的噪声加大，加快运动机件的疲劳破坏。当振幅超过一 定限度时，就会导致机械构件产生过大的应力而失效。

液压冲击现象
在液压系统中，当液体流动方向突然改变或停止时，液体流动速度发生急剧变化。由于流动液体的惯性和运动部件的惯性，使系统中的压力在某一-瞬间
突然急剧上升，形成一个压力峰值，这种现象称为液压冲击。液压冲击形成的瞬时压力峰值称为冲击压力其值是正常工作压力的3~4倍。它不仅会引起系统产生巨大的振动和噪声，恶化工作条件，导致密封装置、管路和液压元件损坏，还会引起某些液压元件产生误动作，破坏系统的工作循环，降低设备的工作质量或造成设备的损坏。因此，研究液压冲击产生的原因及危害，采取减小和预防液压冲击的措施，对提高液压系统的工作稳定性和工作性能有着重要的意义。

液压冲击会使系统瞬时压力比正常工作压力高得很多，甚至超过正常工作压力的2-3倍以上。突然关闭油缸的出油口时，用示波器实测得到的油缸出油口的压力曲线。在液压缸正常工作时，油液压力约为4.5Mpa，突然关闭其出油口后，压力瞬时增加到近12. OMpa,增大到原油压的三倍。
液压冲击的危害是很严重的，会产生巨大的振动和噪声，且使油温升高，还会使密封装置、管件、连接件及其他元辅件损坏。例如，有一-直径为25mm，壁厚为1.5mm的油管，当系统工作压力只有7-10Mpa时，便发现有破坏现象，而这种油管的实际静止破坏压力约高达50- -60Mpa，从而可见，除压力脉动使油管产生疲劳之外，主要原因是液压冲击所致的破坏结果。所以，搞清液压冲击的产生原因，估算出它的压力值，并采取抑制和防治措施是非常重要的。

液压冲击的危害主要有四个方面:
1、系统中的部分元件如管道、仪表等因受到过高的液压冲击力而遭到破坏，一般来说液压冲击力可以达到普通工作压力的3到4倍。
2、系统的可靠性和稳定性会收到液压冲击的影响，如压力继电器会因液压冲击而发出错误信号，干扰液压系统的正常工作。
3、系统受到液压冲击时，发出较大的噪声和振动，并可能令连接件松动、压力阀调节压力改变并出现泄漏。
4、在液压冲击过程中，导管中形成的高频率的重复载荷，容易使导管疲劳破坏。

产生流体冲击问题的主要原因
1、液流通道迅速关闭或换向时的液压冲击。
2、运动部件在高速运动中突然被制动。
3、流体中空气引起的液压冲击。

1、液流通道迅速关闭时的液压冲击
液压冲击多发生在油液突然停止运动的时候，例如迅速关闭阀门，油液的流动速度突然降为零，这时油液受到挤压，使油液的动能转换为压力能，于是油液的压力急剧升高，冲撞液压系统产生液压冲击波，并迅速在管道内传播。液压冲击波的传递、反射、油液方向的变化将反复进行，直到耗尽引起冲击的能量，冲击现象才会结束。因此，管路中的油液流速突然变化是产生冲击的外界条件，而油液本身的惯性是产生冲击现象的内在因素。
液流通道迅速关闭时的液压冲击(水锤现象)
液体自一具有固定液面的压力容器沿长度为1,直径为d的管道经出口处的阀门以速度v0流出。若将阀门突然关闭，此时紧靠阀门门口B处的一- 层液体停止流动，压力升高△p。其后液体也依次停止流动，动能形成压力波，并以速度c向A传播。此后B处压力降低△p，形成压力降波，并向A传播。而后当A处先恢复初始压力后压力波又传向B。则如此循坏使液流振荡。振荡终因摩擦损失而停止。
液流换向时产生的冲击
当换向阀移到中间位置时，压力油突然与液压缸切断，但是由于运动部件的惯性作用，使液压缸一端油腔中的液体受压缩，压力突然升高，而另一端油腔中的压力下降，形成局部真空。因此，液流换向时产生液压冲击。