伺服控制阀

伺服控制阀输入信号(电量、机械量)多为偏差信号(输入信号与反馈信号的差值),阀的输出量(压力、流量)也按照其输入量连续、成比例地进行控制的阀。这类阀的工作性能类似于比例控制阀,但具有较高的动态瞬应和静态性能,多用于要求较高的、响应快的闭环液压控制系统。

大型钢厂现场采用的主要伺服阀如:伺服阀，

1、基本结构：

主阀体（阀芯/阀套）、先导阀（伺服射流管）、电气控制盒（放大版）

2、工作原理

伺服射流管先导级

射流管先导级主要由力矩马达、射流管和接收器组成。

当线圈中有电流通过时,产生的电磁力使射流管喷嘴偏离零位,管内的大部分液流集中射向一侧的接收器,而另一侧接收 器所得到的流量减少,由此造成两接收器的压力变化。主阀阀芯因此压差而产生位移。

先导级的泄漏油通过喷嘴环形区域处的排出通道直接回油箱。

液压伺服控制系统

以伺服控制元件完成动力与运动方向控制，综合压力、流量、方向控制为一体，利用偏差控制进行纠偏，以满足精度控制需要，必须为闭环控制，可实现较高频率( 100HZ以上) ,有滑阀式、喷嘴挡板式、射流管式等，常采用机械伺服、电液伺服、气液伺服。

液压伺服系统的特点如下:

(1)反馈。把输出量的一部分或全部按一定方式回送到输入端，并和输入信号进行比较，这就是反馈。在上例中，反馈(检测时速装置输出)电压和给定(输入信号)电压是异号的，即反馈信号不断地抵消输入信号，这是负反馈。自动控制系统大多数是负反馈。

(2)偏差。要使液压缸输出一定的力和速度，伺服阀必须有一定的开口量，因此输入和输出之间必须有偏差信号。液压缸运动的结果又力图消除这个误差。但在伺服系统工作的任何时刻都不能完全消除这一-偏差，伺服系统正是依靠这一-偏差信号进行工作的。

(3)放大。执行元件(液压缸)输出的力和功率远远大于输入信号的力和功率，其输出的能量是液压能源供给的。

(4)跟进。液压缸的输出量完全跟进输入信号的变化。

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。

型号 2WRCE…/P and 3WRCE…/P 

高频响方向阀（块状安装），先导式，带集成电控器（OBE）和电位反馈

规格32至50

元件系列2X

安装尺寸按照DIN ISO 7368 (2WRCE型)

适合位置、速度和压力的闭环控制

通过比例阀控制

结构紧固

通过感应位置监测器对控制阀芯进行位置感应

规格63和80，请询问本公司

力士乐REXROTH三位三通方向高响应阀，先导操作，电感位置传感器3WRCBH

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力士乐REXROTH三位三通高响应方向阀（插装阀）与集成控制电子3WRCBEE

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