A method for predicting and adjusting thickness of continuous hot-dip galvanized coating on strip steel

Abstract

The invention discloses a strip steel continuous hot-galvanized plating layer thickness prediction and adjustment method. A plating layer thickness prediction model is built by a regression analysis method; a plating layer thickness prediction value is calculated in real time; and according to strip steel hot-galvanized process data and a present plating layer thickness target value, an air knife adjusting quantity is calculated. The plating layer thickness prediction method can predict the plating layer thickness value in real time and calculate an air knife adjusting quantity reference value to bring convenience for operators to timely adjust air knife parameters. The method realizes the plating layer thickness dynamic prediction, guarantees the plating layer thickness to quickly reach the target thickness, and prevents long-time plating layer thickness fluctuation.

Description

Technical field [0001] The invention belongs to the technical field of continuous hot-dip galvanizing of strip steel, and is suitable for coating thickness prediction and operation guidance of a continuous hot-dip galvanizing production line of strip steel. Background technique [0002] The hot-dip galvanizing process of strip steel is a complex multi-variable system, and there are errors or large lag problems in the measurement of the coating thickness, which results in the generally low precision of the coating thickness control. There are usually two methods of coating thickness detection: hot thickness gauge and cold thickness gauge. The hot thickness gauge is installed above the air knife, and the detection has almost no lag, but there are large errors in the measurement of coating thickness. Most of the hot-dip galvanizing production lines for strip steel use cold thickness gauges. The cold thickness gauges are more accurate in measuring the thickness of the coating, but us...

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Problems solved by technology

[0004] Patent 2 (CN 102465246) is a device and method for measuring the thickness of the zinc layer in a continuous hot-dip galvanizing line. In the invention, the corresponding result of the coating thickness and the adjustment amount of the air knife is calculated after the measurement of the coating thickness gauge, and the thickness gauge is usually installed 100 meters behind the air knife. There is a serious lag in the corresponding results, resulting in a lag in the operator's adjustment of the coating thickness

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