Application Research On The Drive And Control Of ShouGang CGL#2 Skin-pass-mill

ShouGang CGL#2 has imported the latest steel-galvanizing line in the world and the product covers CQ, DQ, DDQ, HSS, FH and so on. The line realizes automation during the whole process with the strips galvanized continuously. After treatment of plating, it uses the most popular four roll skin-pass-mill to ensure galvanized sheet smooth.This thesis is talking about galvanizing line of the introduction of skin-pass-mill as an example. Making the drive and hydraulic equipment for the long-term observation and research, combined with extensive reading of automation program, and from the steel mills of domestic other similar equipment control experience, to this skin-pass-mill of the depth analysis. It improved the surface quality and processing properties of the product greatly, its control system is very complex, the control accuracy is quite high. The system contains the operation control system and drive control system, hydraulic gap control system (HGC), elongation ratio control system, bending roll control system, wet roller system and so many kinds of system, involving machine, hydraulic, pneumatic, drive, automation, and other fields.The author has deeply understood the Skin-pass-mill systems of a variety of control systems. The problem of the Number 5 tension roll motor load unevenly distributed, as well as the calibration interruption and strip folds occur frequently have been made a comprehensive analysis. Focus on these above problem, I introduced K-DROP controlling method and gave some solutions. As for the traditional PID adjust of the skin-pass-mill, the author made great improvement and introduced fuzzy control concept successfully. The method and concept have been transformed the results applied to the actual production, and achieved better results, also improved the product quality.