基于PLC的拉深筋实验台电液控制系统改造设计

Innovative Design of Drawbead Experiment Device Electro Hydraulic Control System Based on PLC

原有继电器液压实验台采用继电器控制系统,设备陈旧老化,可靠性低,且可实现功能少,灵活性差,不能满足新的实验使用要求,在原实验台基础上进行了改造。新实验台利用CAN总线技术,采用一套基于现场总线(CAN-BUS)的PLC控制系统,扩大了实验台的功能范围,提高了控制系统的柔性,实现了实验数据处理的自动化。对原液压系统进行了改进,由传统的节流回路改为由电液比例阀和负载敏感泵组成的负载敏感回路,实现了多种工况的灵活转换。而且通过压力补偿技术可以实现工作油缸运动速度的可控性和智能性,通过负载敏感技术,减少了系统发热和能量损失,实现了电液控制系统的节能化设计。

The original hydraulic experiment device,which adopts the relay control system,gets older seriously,has low reliability,achieves less function and has poor flexibility.The original experiment device system can not meet the new experimental requirements,and must be transformed.By using the CAN bus technology and adopting a set of the PLC control system based on field bus（CAN-BUS） in the new experiment device,the scope of the experiment device capabilities are expanded,the flexibility of the control system is improved and the automation of experimental data processing is achieved.By means of the improvement from traditional throttle loop to load sensing circuit which is consisted of the electro hydraulic proportional valve and load sensing pump,the original hydraulic system has been improved to achieve a flexible conversion of variety working conditions.And the controllability and intelligence of the work cylinder velocity can be achieved by using pressure compensation technology and the system heat and energy loss can be reduced as well as the electro hydraulic control system for energy saving design can be achieved by using the load sensing technology.