非接触式并行连铸方坯在线定尺切割系统研究

Research on a non-contact parallel continuous square billet on-line definite-length cutting system

针对接触式定尺测量存在的精度低、故障率高等缺陷,基于机器视觉技术,定时进行图像采集、图像预处理以及长度跟踪计算,实时计算出方坯的长度;预设定尺长度到后,工控机发切割信号给PLC,PLC控制切割机将方坯切割成定尺长度.在图像处理算法中,提出了前向轮廓跟踪算法,通过跟踪方坯图像的上边缘像素点,能够准确跟踪到方坯的头部,计算出方坯的长度.应用多线程并行处理技术,节省了程序的运行时间.试运行表明:能够满足连铸方坯定尺的实时性、稳定性和高精度测量要求.

Because of low-accuracy and easy-damage of the contact definite-length measurement, a non-contact continuous square billet on-line definite-length cutting system was designed based on machine vision. Through regular image capture, preprocessing and length calculation, the computer could calculate the length of the square billet on-line. For the definite length, the computer would send a cutting signal to the PLE, then the PLC would control the cutting machine, and the square billet could be cut to a definite length. At the length calculation stage, a forward contour-tracking algorithm was presented by tracking the upper edge pixels, which could track the head of the square billet and accurately calculate the length. In addition, the multi-threading parallel process technique was applied, which could greatly reduce the rtmtime of the program. Experimental results show that this system can achieve the goals of real-time, stabilization and high-accuracy.