基于QCS014A实验台的比例阀实验系统

Development of Proportional Valve Experiment System Based on QCS014A

基于原有QCS014A实验台开发了电液比例阀实验系统,在充分利用现有设备硬件基础上进行硬件补充和软件编制。该系统运用LabVIEW软件编写系统人机界面,通过串口实现人机界面和PLC通信,设定的控制参数通过PLC实现电磁阀通断和比例阀的阀芯位置控制,PLC同时采集压力流量等信号反馈给人机界面,经过相应处理,界面实时显示实验结果波形和比例阀性能指标。该比例阀实验系统可以进行电液比例换向阀、电液比例流量阀、电液比例溢流阀性能测试,实现比例阀的稳态控制特性、稳态负载特性、动态特性曲线测量。同时,为了加深学生对比例阀运用的了解,系统还可进行双缸同步实验,通过PID控制实现双缸精确同步。借此系统,开设了比例阀的性能测试和双缸同步实验,取得了良好实验效果。

In this paper,the electro hydraulic proportional valve test system was developed based on the original QCS014 A experimental platform. The hardware supplement and software development were carried out based on the existing equipment. The LabVIEW software was used to design man-machine interface,the interface and PLC were realized through the serial port. The control parameters were transferred to PLC to control solenoid valve and electro hydraulic proportional valve,then the pressure signal and flow signal were collected by PLC. The signals were fed back to the man-machine interface,and then the experiment waveforms and index were displayed after processing the corresponding. The electro-hydraulic proportional valve, the electro-hydraulic proportional flow valve, the electro hydraulic proportional relief valve could be test based on this proportional valve experiment system. The proportional valve steady control characteristics,the static load curve characteristics,the dynamic characteristics could be measured,also. At the same time,the double cylinder synchronization experiments through the PID control to achieve double cylinder precise synchronization could be carried out in order to deepen the students＇ understanding of the use of the electro hydraulic proportional valve. The performance test of proportional valve and the experiment of double cylinder synchronization were been made by this system and good results were achieved also.