探头旋转式超声检测可以实现快速自动检测,被各钢厂广泛应用。探伤时探头和被检工件之间充满水环,水作为耦合介质,需要解决快速稳定问题,水流大小、气泡等都会影响超声波的发射和接收信号,导致检测灵敏度下降,造成缺陷误检、漏检。为了改善这种现象,设计了一种水流量自动调节系统,该系统由可编程逻辑控制器(Programmable Logic Controller, PLC)、执行机构、流量调节装置、流量测量装置组成。为了满足水流量精准调节,该系统采用闭环控制,通过输入给定的流量设定值和流量测量后的偏差值经过比例、积分、微分(Proportional Integral Derivative, PID)算法运算后得到控制量,作用于水流量调节装置,自动调节阀门开度大小,从而实现供水系统连续稳定工作,提高探伤设备的检测效率,降低劳动强度。

The probe rotary ultrasonic testing can achieve rapid and automatic detection, and has been widely used by various steel mills. During flaw detection, a water ring is filled between the probe and the workpiece for inspection, and water serves as the coupling medium. It is necessary to solve the problem of rapid stability. The water flow and bubbles can affect the emission and reception signals of ultrasonic waves, leading to a decrease in detection sensitivity, and resulting in defect misdetection and missed detection. In order to improve this phenomenon, an automatic water flow regulation system was designed, which consisted of a programmable logic controller (PLC), an actuator, a flow regulation device, and a flow measurement device. In order to meet the precise regulation of water flow, the system adopted closed-loop control. The control quantity was obtained by inputting the given flow setting value and the deviation value after flow measurement through proportional, integral, and differential (PID) algorithm calculation. It acted on the water flow adjustment device and automatically adjusted the valve opening size, thereby achieving continuous and stable operation of the water supply system, which improved the detection efficiency of the flaw detection equipment and reduced the labor intensity.