一、前言一般电液伺服阀,是由电气液压伺服阀和压下缸内设置的数字位置检测器(电磁标尺)组合而成的位置控制系统,因此,该设备是高精度的和反应灵敏的液压压下装置。二、位置检测点在压下缸的中心线上,检测压下缸和柱塞间的位置相对变化。在压下缸的中心线上,检测柱塞位置的相对变化。 I. INTRODUCTION Generally, the electro-hydraulic servo valve is a position control system composed of electro-hydraulic servo valve and digital position detector (electromagnetic scale) set in the press cylinder. Therefore, the device is highly accurate and responsive Hydraulic pressure device. Second, the location of the test point in the pressure on the centerline of the cylinder, the pressure cylinder and the plunger to detect the relative changes in position. On the centerline of the depressor cylinder, the relative change in plunger position is detected.