小负载液压缸活塞杆漂移故障分析
Fault Analysis of Piston Rod Drift in Small Load Hydraulic Cylinder

本文利用AMESim软件对不同的液压系统建立了小负载液压缸仿真模型，根据实际产品参数对液压缸模型进行配置。由于液压缸的内泄漏特性，当活塞杆完全回收、换向阀回到中位后，在一定的时间内出现活塞杆漂移现象，本文针对某型液压缸从内漏量、工作压力、系统背压、静摩擦力4个方面对内泄漏特性的影响开展了研究。结果表明：活塞杆自动伸出的行程取决于伸出时负载和密封圈静摩擦力的大小，完全伸出所需要的时间取决于内泄漏量的大小。最终提出了防止液压缸由于内泄漏特性导致活塞杆漂移故障的措施。
In this paper, AMESim software is used to establish the simulation model of small load hydraulic cylinder for different hydraulic systems, and the hydraulic cylinder model is configured according to the actual product parameters. Because of the internal leakage characteristics of the hydraulic cylinder, when the piston rod is fully recovered and the reversing valve returns to the middle position, the piston rod will automatically extend out in a certain period of time. This paper studies the influence of the internal leakage, working pressure, system back pressure and static friction force on the internal leakage characteristics of a certain type of hydraulic cylinder. The results show that the stroke of the piston rod automatically extending depends on the size of the load and the static friction force of the sealing ring, and the time required for extension depends on the amount of internal leakage. Finally, the measures to prevent fault of the piston rod drift due to the internal leakage of the hydraulic cylinder are put forward.