REXROTH先导式顺序阀R900596755

REXROTH先导式顺序阀R900596755 DZ10-2-52/200，德国力士乐顺序阀，武汉百士自动化设备有限公司主营销售产品，原厂原装，拒绝假货，客户买的安心，用的放心。价格优惠，常用产品现货供应，欢迎新老客户询价采购！

 

DZ型先导顺序阀

1.结构和工作原理

DZ型先导顺序阀适用于按压力控制顺序动作的液压系统。DZ型阀是由先导阀、带插入式主阀芯的主阀及可供选择的单向阀组成。根据控制油的供给和排出的不同情况，构成不同型式。

背压阀DZ,,- 30/210

阀腔的压力油由通道通过阻尼器作用在先导阀的控制活塞上，同时压力油也通过阻尼器作用在主阀芯的上腔。当A腔压力升高超过弹簧的调定值时，控制活塞朝着弹簧的方向移动。此时主阀芯. 上腔的油通过阻尼器、控制边和通道流到B腔，并在主阀芯上形成1个压力差，使主阀芯打开，把A腔和B腔接通。在弹簧的作用下可保持这个开启压力的恒定。

在控制活塞上的泄漏油通过内部通道流到B腔。

若从B腔向A腔回油，可选择带有内装单向阀的结构。,

背压阀DZ,,- 30/210X,

这种阀的工作原理与DZ,,- 30/210 型相同，只是控制油输入方式不同。DZ,,一30/210X,, 型阀的控制油是通过通道从外部输入的。

顺序阀DZ,, 30/210Y

这种阀的工作原理与DZ,一30/210 型相同，只是控制活塞处泄漏油排出方式不同。DZ,,- 30/210Y 型阀控制活塞的泄漏油必须是通过通道或者是(在无背压的情况下排回油箱。控制油经过通道(9) 排到B腔。

卸荷阀DZ,,- 30/210XY

阀腔的压力油经过通道、阻尼器作用在先导阀的控制活塞上，同时A腔的压力油通过阻尼器作用主阀芯的上腔。当X腔的压力升高并超过弹簧调定的数值时，使控制活塞朝着弹簧的方向移动，由于控制活塞的移动使主阀芯上腔的油通过阻尼器和孔流到先导阀的弹簧腔。这样就使压力油在几乎没有压力损失的情况下从A腔流到B腔，从而达到卸荷的目地。弹簧腔的油在无背压的情况下从通道或排到油箱。若要使压力油从B向A流动，则选用带有单向阀的结构即可实现。

2.顺序阀的常见故障及排除

顺序阀及单向顺序阀的主要故障是不起顺序作用。这有二种情况，一种是进油腔和出油腔压力同时上升或下降;另一种是出油腔没有流量。

一种情况的原因之一是阀芯内的阻尼器(5)堵塞，使控制活塞的泄漏油无法进入调压弹簧腔流回油箱。时间一长，进入油腔压力通过泄漏油传入闪下腔，作用在阀芯下端面上，因阀芯下端面积比控制活塞要大得多，所以阀芯在液压力作用下使阀处于全开位置，变成一个常开阀，因此进油腔和出油腔压力会同时上升或下降。另外，阀芯在阀处于全开位置时卡住也会引起上述现象。阻尼器堵塞也是如此。

第二种情况的原因是泄油口安装成内部回油形式，使调压弹簧腔的油液压力等于出油腔油液压力。因阀芯，上端面积大于下端面积，阀芯在液压力作用下使阀口关闭，顺序阀变成一个常闭阀，出油腔没有流量。另外，阻尼器堵塞、阀芯在阀处于全关位置时卡住也会引起上述现象。( 出油腔没有流量)当端盖上的阻尼器堵塞时，控制油液就不能进入控制活塞腔，阀芯在调压弹簧力作用下使阀口关闭，出油腔同样也没有流量。

REXROTH先导式顺序阀R900596755 DZ10-2-52/200

德国力士乐REXROTH先导式顺序阀订货号物料号和型号：

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A11VO的LE2S控制系统

LE2S控制系统与LRS控制系统不同之处是采用了变功率比例电磁阀和变补偿压力比例电磁阀，可以实现变功率控制和变补偿压力控制。为此，在LRS控制系统中恒功率阀和油泵流量调节阀中都加上了比例电磁铁，成为变功率比例电磁阀和变补偿压力比例电磁阀。

变功率比例电磁阀

在恒功率阀上加上比例电磁铁，其电磁力作用在阀杆上，其功能实际上是改变弹簧作用力。油泵功率与弹簧力FS成正比，通过改变比例电磁铁的输入电流I使电磁力变化，从而改变了油泵的功率控制曲线。

为了充分利用发动机功率，电控设定的大功率线高于发动机额定功率线PH;电控失效后，功率线低于PH,电控小功率线更低。比例电磁铁控制的恒功率曲线是一个区间。变功率控制在挖掘机有二大功用:

1.实现全功率控制:无变功率控制时，考虑到大气状态(气压，气温和湿度)变化、采用较差燃油和使用过程中发动机性能恶化等原因都会使得发动机功率有所下降，为了防止发动机过载和熄火,一般油泵功率设定都低于发动机额定功率。采用变功率阀，大功率设定高于发动机额定功率，可采用转速感应控制使发动机始终保持在发动机额定转速点工作，充分利用发动机功率。

2.实现工况控制:挖掘机要求在不同工况下作业，例如重掘削工况、经济作业工况和精细作业工况等，要求油泵功率有不同的设定，变功率控制能实现这个要求。

 

油泵流量调节变补偿压力阀在油泵流量调节阀上加，上比例电磁铁，通过改变电流可改变其电磁力，此电磁力作用在流量调节阀上，实际上是改变了弹簧力，上面己说明油泵流量调节阀的补偿压力取决于弹簧力，改变弹簧力也就改变了补偿压力。补偿压力与电流I成直线关系。在不同的补偿压力下，供给液压作用元件的流量与阀杆行程的关系。降低△PLS，供油量减少;阀秆行程加大，流量增加比较平缓。改变控制电流能使补偿压力变化，补偿压力变化能改变去液压作用元件的流量,起调速作用,变△PLS控制能更好地适应不同作业工况的流量需要，特别是改善了精细作业微动性能;另外随着发动机转速改变，泵的流量随着变化，补偿压力也应随之改变。应当说明，补偿压力阀输出的控制油直接操纵液压泵变量油缸,而功率阀输出的控制油经补偿压力阀操纵液压泵变量油缸，因此两阀的控制关系为补偿压力阀优先。各液压作用元件液压回路动臂、斗杆和铲斗液压回路其特征为:1.在油缸的两条油路中都设有限压阀防止过载;2.动臂和斗杆的液压回路中若需要可采用更新阀杆，实现更新功能。

行走液压回路由以下阀组成:限压阀二个 分别限制行走马达两油路压力，又起补油作用;平衡阀防止下坡时****;制动操纵阀由左右油路通过梭形阀引入压力油，在压力油作用下此阀打开，压力油通向制动器;减压阀在 压力油通向制动器的途中设减压阀，使通向制动器的油压降低，制动器承受较低压力,

 

剪叉式高空作业平台行走液压系统

剪叉式高空作业平台是一种常用的高空作业专项使用设备,其主要作用是将工作人员运送至高空进行作业或者垂直运送及卸载货物，广泛用于食品加工企业的设备检修及材料运送、仓库、建筑、桥梁及公路建设、电力维修、航空航天、船舶制造等领域。

因此,剪叉式高空作业平台的整机安全性，行走的稳定性,使用的舒适性就显得尤为重要。

 

剪叉式高空作业平台行走液压系统。

行走液压系统主用来实现剪叉式高空作业平台平稳行走,通过相应液压元件的控制，可实现行走制动的启停及高低速行走。电机泵为整个行走系统提供动力，过滤器用来过滤液压回油,调压阀用来控制整个行走液压系统的压力,制动器用来实现行走的启停,通过电磁换向阀与电磁换向阀配合使用,可实现剪叉前进与后退高低速行走，通过单向阀和的配合使用，可以防止马达在系统停止供油时继续行走出现吸空，保证马达侧管路充满液压油。

德国力士乐REXROTH顺序阀订货号物料号和型号：

R900766469 DZ30-1-52/100

R900716137 DZ30-1-52/100XM

R900536229 DZ30-1-52/100XYM

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