4WRA6V30-22/G24N9K4/V-589力士乐比例阀

4WRA6V30-22/G24N9K4/V-589力士乐比例阀

功用：正向流通，反向受控流通

结构：普通单向阀 液控装置

工作原理：K不通压力油，工作方式同普通单向阀；K通压力油，阀口打开，可以反向流通

应用：∵液控单向阀具有良好的反密封性

常用于保压、锁紧和平衡回路

图形符号含义：

1、 位——用方格表示，几位即几个方格

2 、通——┴ 、┬ 箭头首尾和堵截符号与一个方格有几个交点即为几通。

3 、油口有固定方位和含义，p——进油口(左下）， T——回油口（右下） ，A.B——与执行元件连接的工作油口（左、右上）。

4 、弹簧——W、M，画在方格两侧

5 、常态位置 ——原理图中，油路应该连接在常态位置。如三位阀在中间一格。

滑阀的中位机能：即滑阀处于常态时的状态，有M型，H型，O型，P型，M型等。

 

电液比例阀是比例控制系统中的主要功率放大元件,按输入电信号指令连续地成比例地控制液压系统的压办流量等参数。与伺 服控制系统中的伺服阀相比,在某些方面还有一-定的性能差距(主要性能比较如表1所示),但它显著的优点是抗污染能力强,大大地减少了由污染而造成的工作故障,提高了液压系统的工作稳定性和可靠性。另一方面比例阀的成本比伺服阀低，结构也简单,已在许多场合获得广泛应用。

 

比例阀按功能分为三大类

(1)比例压力阀。有溢流阀减压阀,分别有直动和先导两种结构;可连续地或按比例地远程控制其输出油液压力;

(2)比例换向阀。有直动和先导两种结构,直动阀有带位移传感器和不带位移传感器两类。由于使用了比例电磁铁阀芯不仅可以换位，而且换位的行程可以连续地或按比例地变化。因而连通油口间的通流面积也可以连续或按比例地变化。所以比例换向阀不仅能够控制执行元件的方向而且能够控制其速度。因为这个原因比例阀中的比例换向阀应用也为普遍;

(3)比例流量阀。有比例调速阀和比例溢流流量控制阀,可连续地或按比例地远程控制其输出流量。

比例阀的输入单元是电-机械转换器,它将输入的电信号转换成机械量转换器有伺服电机和步进电机力马达和力矩马达比例电磁铁等形式。但常用的比例阀大都采用了比例电磁铁，比例电磁铁根据电磁原理设计,能使其产生的机械量(力或力矩和位移)与输入电信号(电流)的大小成比例,再连续地控制液压阀阀芯的位置，进而实现连续地控制液压系统的压力方向和流量。比例电磁铁的结构，它由线圈、衔铁推杆等组成,当有信号输入线圈时,线圈内磁场对衔铁产生作用力,衔铁在磁场中按信号电流的大小和方向成比例连续地运动,再通过固连在一起的销钉带动推杆运动,从而控制滑阀阀芯的运动。应用广泛的比例电磁铁是耐高压直流比例电磁铁。

4WRA6V30-22/G24N9K4/V-589力士乐比例阀

4WREE..型比例控制阀

1.结构和功能原理

该二位四通和三位四通比例方 向阀为直控,板式结构;由比例电磁操作,比例电磁.带中心螺纹,圈可单独拆卸,电磁的控制可通过外部放大器( WRA型)或内置的放大器(WRAE型)实现。

结构:

该阀由下列部分组成:

带安装底面的阀体( 1 )

带弹簧(3和4)的控制阀芯(2 )

带中心螺纹的电磁铁( 5和6 )

位移传感器(7 )

可选带内置放大器( 8 )

机械零位调整(9 ),

工作原理:

电磁铁(5和6 )不带电时,对中弹簧(3和4 )将控制阀芯(2 )保持在中位

比例电磁铁得电被激励后,会直接推动控制阀芯( 2),例如:控制电磁"b" (6 )被激励，控制阀芯(2)被推向左侧,位移与输入电信号成比例,这时,P口至A口及B口至T口通过阀芯与阀体形成的节流沟通并具有渐进的流量特性。电磁铁( 6 )失电控制.阀芯(2)被对中弹簧(3)重新推回中位。

在电磁铁失电的情况下,阀芯( 2 )在电磁跌复位弹簧的作用保持在机械中位。这对机能符号”V”的阀芯来说,与液压中位无关!当阀用于闭环控制而关闭时,阀芯则置于液压中位。

必须避免回油管路中的油全部排空, 必要时在回路中安装背压阀(背压约2 bar)。

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力士乐REXROTH比例方向阀，直控式4WRA ...XE

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力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯带位移电反馈，不带集成式放大版（OBE）4WRE

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力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯带位移电反馈，带集成式放大版（OBE）4WREE

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力士乐REXROTH三位四通比例方向阀，直接操作、集成式放大版（OBE）4WREEM

液压比例控制系统

以比例控制元件完成动力与运动方向控制，分为比例压力阀、比例流量阀、比例方向阀及比例方向流量阀，可为模拟量输入或数字量输入，视是否带反馈分为开环控制与闭环控制，一般获得频率不是很高(10HZ)以内，高频响阀可实现较高频率。

若精度要求不高可考虑使用电液比例控制系统，一般电液比例控制系统可达至以下精度

位置精度- 3 mm

速度精度带压力补偿器- 3%

加减速斜坡时间-0.5秒

压力带位移传感器的产品-比例压力阀设定的0.3% (如压力设定为200bar,精度可达0.6bar)

一般的多驱动器液压系统皆要求流量及压力控制，提供比例压力及流量控制系统

开环式比例压力及流量控制可用于定量泵及变量泵系统。

速度和流量比例控制的分别是:

流量控制只控制供油量,并不控制驱动元件的运动方向;

若系统负载及变速要求高，则要使用速度控制系统。

速度比例控制多用于自动化控制、注塑机、压力机等