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众所周知,伺服阀的类型很多。就控制液压缸运动位置的伺服阀来说,有滑阀式伺服阀和电液伺服阀等。在众多的位置控制伺服机构中,均采用直接检测位移量并把位移量反馈到伺服阀而对工作机构的定位进行控制。这些伺服机构的控制精度较高,各控制元件、传感元件、检测元件和伺服阀的加工精度要求也高,加工工艺复杂,而且对装配也有严格地要求。因此这类伺服机构造价昂贵,限制了其应用;而且这类伺服机构环节较多,检修不方便。所
As we all know, there are many types of servo valves. To control the position of the hydraulic cylinder servo valve, a spool valve servo valve and electro-hydraulic servo valve. In a large number of position control servo, are used to directly detect the displacement and the displacement feedback to the servo valve to control the positioning of the working mechanism. The control precision of these servo institutions is high, the control precision of each control element, sensor element, detection element and servo valve is also high, the processing craft is complicated, and the assembly also has the strict request. Therefore, this type of servo mechanism is expensive, which limits its application; moreover, there are many such servo mechanisms, and the maintenance is inconvenient. The