关键词: 高温铝液, ＰＬＣ控制, 自适应神经模糊推理系统, Ｍａｔｌａｂ

Abstract: To ensure the stable feeding flow rate of the aluminum plate casting machine and the quality of the output aluminum plate, it is necessary to keep the high-temperature aluminum liquid level stable. In view of the problems of manual adjustment of aluminum liquid level in production relying on experience, poor real-time performance and high danger, a system for automatically controlling the height of high-temperature aluminum liquid level is designed. According to the production process in the factory, a mechanical structure of high-temperature aluminum liquid flow control device and a PLC-based control system are designed. The adaptive neurofuzzy inference system PID (ANFIS-PID) control strategy is proposed.ANFIS-PID combines the fuzzy inference system with the neural network, extracts fuzzy rules based on input and output information, obtains more suitable membership functions, realizes automatic adjustment of PID parameters, and has the learning ability of neural network. It ensures that the system is always in the optimal state as much as possible, which is conducive to improving the stability and adjustment speed of control.Matlab/Simulink simulation tests were conducted and compared with traditional PID control and self-disturbance control. The results showed that the ANFIS-PID strategy control had the smallest overshoot, which was 59.65% lower than that of traditional PID control, and the shortest rise time and adjustment time. The overall performance was better. At the same time, high-temperature aluminum liquid level control tests were carried out on the production site. The results showed that when ANFIS-PID control was used, the system adjustment speed was faster, the stability was higher, the overshoot was 46.42% lower than that of traditional PID control, and the time for high-temperature aluminum liquid to stabilize at the target liquid level height was shortened by 35 seconds. This proves that the control strategy has good control and adjustment ability and adaptive learning ability, and has better control effect on high-temperature aluminum liquid level. The system program has set up a self-check function for abnormal communication status, motor status, continuous abnormal liquid level and other situations, and is equipped with a configuration screen human-machine interaction system, which can monitor the working status of the system and the current liquid level in real time, making the system more user-friendly.The system has power-off protection function. When receiving the power-off signal, the system will reduce the flow rate to the minimum, which maximizes the safety problem of production after power failure. It further improves the safety and economy of production and is easier to put into production. The mechanical structure of circular power output group, flow control brazing and its fast clamping mechanism, laser liquid level monitoring mechanism are designed. The mechanical structure of high temperature aluminum liquid level automatic control system is reasonable and has the advantages of fast disassembly and assembly. It works well in production site, which further proves the rationality of the system.