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工作原理和结构说明：Operation principle and structure explanation
3.1．工作原理：Operation principle
电液推杆以电动机正反转，带动双向泵输出压力油，经液压阀控制，送至液压缸，实现活塞杆的往复运动。
Electrohydraulic push rod drives the two-way pump to output pressure oil with rotation of motor clockwise and counter-clockwise, by control of hydraulic valve, send to the hydraulic cylinder, to achieve the reciprocating movement of the piston rod.
3.2．过载自动保护功能：Automatic overload protection function:
电液推杆工作时，当活塞杆所受外力超过调定的输出力距活塞运动到终点；油路中的油压迅速增高至调定值，安全阀迅速溢流，实现过载保护。电机仍在运转，但不会烧毁。
When the electrohydraulic push rod works, if the external force suffered by the piston rod is more than the setting output torque, the piston moves to the end; oil pressure in the oil pipeline increases rapidly to the setting value, the safety valve overflows rapidly, to achieve overload protection. Motor is still running, but will not burned.
3.3．自锁功能：Self-locking Function
电液推杆的油路中，设计了自锁阀。电机停止，活塞杆能自锁在任意位置上，处于保压状态。
In the oil pipeline of the electrohydraulic push rod, a self-locking valve is designed. When the motor stops, the piston rod can self-lock at any locations, in the state of pressure keeping.
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