现在广泛使用的是无氧氮气压力检测。
Oxygen free nitrogen pressure testing is now widely recommended.
分析了活塞杆与铲头碰撞点的选择方法和氮气室的初始压力和初始容积的确定方法。
Analyse choice method of collision point of cylinder and shovel head and confirm initial pressure and volume of nitrogen chamber.
然后介绍回收氮气压力的控制过程及PID控制器与变频器的联接方式。
Then introduced the connections of the recycling nitrogen pressure controlled process and PID controller and frequency inverter .
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