Research And Design Of Ultra Fast Cooling Control System For Short Pass Hot Rolled Strip

Hot rolling cooling process is an important process to determine the comprehensive performance of finished strip steel.In the production process of strip steel cooling in hot rolling plant,the research on hot rolling cooling control can not only improve the quality of strip steel,but also save energy and improve production efficiency.This design takes the process technology of 70 m UFC short cooling line in a hot strip mill as the research object,improves the ineffective cooling section caused by the middle detector in the process,and designs a new control system more suitable for the improved process.The new control system consists of three parts.The first is the preset module of ultrafast cooling section and laminar cooling rough adjustment section.This part follows the original control system.The second is the laminar cooling fine adjustment section.In order to improve its dynamic performance and meet the requirements of control accuracy,a master-slave fuzzy control system based on variable structure fuzzy control is proposed.In Simulink simulation,the actual strip thickness and speed are used to design the M-function package for controlling the output decision-making to control the temperature,and the actual crimp temperature is used for simulation comparison.The third is the deeply affected laminar flow fine-tuning section,and a fuzzy PID control system is proposed to meet the control requirements.This design uses Siemens s7-1500 series programmable controller as the main control unit,carries on PLC programming to realize the master-slave fuzzy control system and fuzzy PID control system based on variable structure fuzzy control.In order to improve the process and control system of post rolling cooling of hot rolled strip in China,combined with the development trend and cutting-edge technology at home and abroad,introduce foreign advanced technology and management experience,and then formulate a post rolling cooling control scheme suitable for China according to the actual situation of Chinese enterprises.Only by introducing not only equipment but also technology,can we really improve the industrial control level of hot rolled strip production process in China as a whole.A reasonable control scheme is conducive to China’s technological reform and create more economic benefits,making the automation level of China’s industrial field vigorous and upward.