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为实现大型回转件超声波探伤系统中探头的自动定位,研制了一种基于可编程逻辑控制器(PLC)的闭环控制系统。根据工业现场的实际环境,设计了以带AD转换模块的小型PLC为控制核心,利用位置接近开关、微型继电器以及直流小电机阵列来实现对超声波探头对工件表面的实时跟踪,保障无损检测信号的采集精度。介绍了系统的硬件(控制电路及机构设计)组成和基于PLC编程器的软件开发。
In order to realize the automatic positioning of the probe in the ultrasonic flaw detection system of large rotary parts, a closed-loop control system based on programmable logic controller (PLC) was developed. According to the actual situation in the industrial field, a small PLC with AD conversion module is designed as the control core. The position proximity switch, micro-relay and DC small motor array are used to realize the real-time tracking of the surface of the workpiece by the ultrasonic probe to ensure the nondestructive detection signal Acquisition accuracy. The system hardware (control circuit and mechanism design) and software development based on PLC programmer are introduced.