Method of controlling casting molten aluminum level of aluminum wire rolling mill based on variable parameter increment (PI) control algorithm

Abstract

The invention discloses a method of controlling the casting molten aluminum level of an aluminum wire rolling mill based on a variable parameter increment (PI) control algorithm. The method comprisesthe following steps of: continuously collecting multiple liquid level data through a laser liquid gauge, and transferring the multiple liquid level data to a PLC (Programmable Logic Controller); firstly using the PLC to carry out median filtering on multiple liquid level data collected by the laser liquid gauge, and then carrying out smooth filtering to obtain a liquid level value; and using the PLC to analyze the liquid level value, judging the liquid level limit to which the limit level belongs, forming a deviation value e (k)=gk-yk through the liquid level value yk and the set height valuegk of the molten aluminum level, and controlling the positive rotation or negative rotation of a stepper motor through the parameter increment (PI) control algorithm.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and in particular relates to a method for controlling the casting aluminum liquid level of an aluminum wire rolling mill based on a variable parameter incremental PI control algorithm. Background technique [0002] Traditional aluminum wire rolling mill casting liquid level control adopts manual operation method, as attached Figure 4 shown. By turning the sliding code 19 on the control lever 12 to the left (or right), the tapered plug 14 is made upward (or downward), thereby controlling the opening and flow of the aluminum liquid storage tank 15 downward. Realize the effective control of the aluminum liquid level height of the casting aluminum liquid gap. If the aluminum liquid level of the wedge of molten aluminum is too high, it is easy to cause the liquid aluminum to overflow the wedge; if the liquid level of the aluminum liquid is too low, it is easy to form a broken strip of the ...

AI Technical Summary

Problems solved by technology

If the aluminum liquid level of the wedge of casting aluminum liquid is too high, it is easy to cause the aluminum liquid to overflow the wedge; if the aluminum liquid level of the casting aluminum liquid wedge is too low, it is easy to form a broken strip of the cast aluminum strip

Due to the small working range of the casting liquid level of the aluminum wire rolling mill, the workers are required to operate frequently and have a strong sense of responsibility

At the same time, the temperature of the casting liquid in the aluminum wire rolling mill is high (usually around 600°C), and in summer, the operators work very hard

[0003] When the high-temperature aluminum water flows down through the round hole of the aluminum liquid storage tank, the liquid aluminum level will fluctuate due to the large drop and the high flow rate. Continuous fluctuation, it is difficult to guarantee the accuracy of the measured wedge aluminum liquid level

[0004] Moreover, this control object is a first-order system with pure hysteresis. Since the downflow opening of the liquid aluminum storage tank is relatively large, it is difficult to control its opening through the tapered plug, and the small upward or downward movement of the tapered plug Changes, the flow rate changes greatly, and the conventional PID algorithm cannot achieve effective control

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