Research And Application Of Ink Reaction Temperature Control System

Ink is an indispensable raw material for the printing industry and widely used in various printing industries.As the demand for society continues to expand,the types and output of inks have been increasing.It has always been the focus of research on how to produce excellent inks.The quality of the ink is mainly determined by the reaction process.Temperature is the most critical factor affecting the quality of the reaction.Once the temperature does not meet the requirements of the ink reaction process,it will not only directly affect the quality and production efficiency of the ink,but also waste raw materials and cause pollution.Therefore,it is necessary to focus on how to control the temperature inside the reactor so that it can follow the ink process setting curve with a certain precision and stability.In the actual ink reaction process,the raw material state and temperature environment in the reactor will always change due to the chemical reaction,which makes the system nonlinear and time-varying.In the second reaction process,materials are added regularly,which will cause serious Interference,resulting in irregular temperature changes;and the reactor is also a typical inertia lag system,it is difficult to establish an accurate mathematical model;and the ink process has requirements for overshoot,response time,recovery speed,especially system stability Accuracy <1°C,which increases the difficulty of temperature control during ink reaction.In order to realize the requirements of ink reaction temperature control,this paper designs the overall scheme design of ink reaction kettle temperature control system,takes S7-1500 as the main controller,and designs various module schemes such as temperature measurement link,temperature heating link and control loop.For the difficulty of ink temperature control,the traditional PID control effect is difficult to meet the ink process requirements.To this end,fuzzy control is introduced to establish a fuzzy PID controller.Based on the fuzzy rules,the controller can continuously adjust the proportional,integral and differential gain coefficients of the PID according to the temperature change,so that the controller has good adjustment ability,not only in the Rapid adjustment can also improve the control effect when disturbed;gray predictive control is also introduced,and the fuzzy PID controller forms a closed loop,and a gray prediction module is established in the feedback loop to predict the temperature at the next moment as the input of the controller.With advanced control,it can reduce the impact of lag.The model of the reactor temperature system is also established according to the principle of heat balance.The feasibility of the algorithm is verified by simulation.The results show that the control method combined with gray prediction and fuzzy PID is better than pure PID or fuzzy PID.Finally,according to the overall scheme,the hardware and software implementation of the system is completed.The Siemens S7-1500 is used as the controller to build the lower computer control system.The program of the main program and each sub-module is written based on the Siemens Botu platform.The configuration is based on Siemens WINCC.The upper computer monitoring system realizes the functions of state control and monitoring of the system.The actual ink production process was used to verify the control effect of the system.Through the experimental data analysis,the response time of the system was<6min,the overshoot was <1%,and the steady state accuracy was <1°C,which not only followed.It has good properties,stableness and high precision,and can meet the process requirements of ink reaction.