Method and system for rapid switching of hot-dip galvanized coating thickness based on dynamic compensation of tool distance

Abstract

The invention provides a method for rapidly switching the hot dip galvanized coating thickness based on knife distance dynamic compensation. The method comprises: S1: obtaining production process quantity information; S2: judging whether the working condition is required to be switched, if not, entering feedback control, and if so, entering a step S3; S3: obtaining a predicted coating thickness through a neural network prediction model, and carrying out iterative optimization on air knife parameters by using a specification optimization variable air knife parameter optimization method to obtain the air knife parameters (the air knife distance Df and the air knife pressure Pf) of the switching terminal point; S4: calculating the air knife pressure adjustment time length and the calculating the air knife pressure reference curve; S5: entering a switching control period, obtaining the current air knife pressure Pi, and calculating the current air knife distance Di adjusted through reverse compensation; S6: outputting Pi and Di, and executing the air knife parameter adjustment; and S7: detecting the weld seam position, judging whether the switching ends, if so, outputting the air knife distance Df and ending the switching, and otherwise, returning to the step S5. With the method of the present invention, the transition time of the system switching between the products having different specifications can be effectively reduced, and the number of transition products in the transition period can be reduced.

Description

technical field [0001] The invention relates to the technical field of industrial process optimization control, in particular to a method and system for rapid switching of hot-dip galvanized coating thickness based on dynamic compensation of tool distance. Background technique [0002] With good mechanical properties and corrosion resistance, cold-rolled hot-dip galvanized sheets have been widely used in industries such as automobiles, home appliances, and construction. The thickness of the zinc layer is an important performance index to measure the cold-rolled hot-dip galvanized sheet, and its control accuracy is directly related to the product quality and production cost of the cold-rolled hot-dip galvanized sheet. Too thick zinc layer will affect the spot weldability and adhesion of the product, and also cause waste of zinc raw materials; too thin zinc layer will affect the corrosion resistance of the product and cannot meet the product specification and quality requireme...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method and system for rapid switching of hot-dip galvanized coating thickness based on dynamic compensation of knife distance to solve the problem of slow air knife pressure adjustment and large zinc layer thickness gauge in the existing galvanizing production process. The measurement lag caused by the measurement lag causes the specification (coating thickness) switching time to be too long and produces a large number of transitional products.

[0009] The second purpose of the present invention is to provide a method and system for rapid switching of hot-dip galvanized coating thickness based on dynamic compensation of tool distance, so as to solve the problem of over-dependence on workers' experience and low control accuracy caused by manual operations in the existing galvanizing production process , The transition time of product specification changes is long, the consumption of zinc is large, and the quality fluctuates greatly

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