由于受工艺条件、生产环境的制约，热轧带钢表面缺陷影响着热轧厂提高产品质量和生产率。文章介绍了Cognex 表面检测系统的基本原理和构成，并介绍了表面检测系统在八钢1750 热轧目前的使用情况。-Due to process conditions, the production constraints of the environment, affect the surface defects of hot rolled strip hot rolling mill to improve product quality and productivity. Cognex article introduces the basic principle of surface detection system and the composition of the surface inspection system introduced in August 1750 hot-rolled steel, the current usage.