基于软PLC控制的单侧浮动式夹紧定位机构的设计∗

摘要

A newclamping positioning pin shaft mechanismwith the function of position changing in a certain range was designed and manufactured on the basis of traditional fixture with a new method,which can adapt to the parts which exists error location and solve the positioning pin can′t smoothly into the positioning hole on some poor machining precision of workpiece clamping. Structure principle and working process was ana-lyzed in detail and the soft PLC control system on the basis of PC was designed. The monitoring information of field devices was realized by profibus and the data was fast uploaded to the upper computer by the indus-trial Ethernet. Thepracticeshows that the clamping position was accurate, adaptable, stable and reliable con-trol system was reliable.%针对传统固定式夹紧定位机构在对某些加工精度较差的工件进行夹紧过程中，销轴无法顺利进入定位孔的问题，以传统的夹紧定位机构为基础，采用新方法设计和制造了一种能够在一定范围内改变定位销轴位置的机构，以适应于存在误差的零部件的夹紧和定位。详细分析了其结构原理和工作过程，设计了基于PC的软PLC的控制系统，通过现场总线和串口通讯实现了对现场设备的监控，采用工业以太网完成数据向上位机的快速传输，实践表明夹紧定位准确，适应能力强，控制系统稳定可靠。