Continuous hot-dip galvanized aluminum-magnesium production method, air knife device, and air knife system

Abstract

The invention provides a continuous hot-dip galvanized aluminum-magnesium production method, an air knife device and an air knife system, and relates to the technical field of continuous hot-dip galvanizing production. It includes a main air knife and an inclined cooling device. The main air knife includes an upper lip and a lower lip that cooperate with each other. There is a first inclined surface on the outside of the upper lip. The inclined cooling device includes a first cooling section that is connected sequentially from bottom to top And the second cooling section, the first cooling section is connected with the first inclined surface, the first cooling section has a second inclined surface, the first cooling gas outlet is opened on the second inclined surface, and the surface of the second cooling section is opened with The second cooling gas outlet, and the spraying directions of the first cooling gas outlet and the second cooling gas outlet are inclined upward. The invention not only has the capability of scraping and blowing the traditional air knife to control the coating, but also has the function of alleviating tear marks. The combined air knife of the air knife and cooling device can cool the strip steel early and control the cooling rate of the coating.

Description

technical field [0001] The invention relates to the technical field of continuous hot-dip galvanizing production, in particular to a production method of continuous hot-dip galvanized aluminum-magnesium, an air knife device, and an air knife system. Background technique [0002] At present, the air knife used in the continuous hot-dip galvanizing production line is mainly used to control the galvanized layer. Its working principle is to use the air knife as the medium to control the coating. cool down. After the steel strip is coated, the air knife is used to control the cooling of the strip steel by a special cooling bellows to control the cooling of the strip steel and the size of the spangles, but it is difficult for the tear marks produced by thick coatings such as zinc aluminum magnesium, aluminum zinc, zinc aluminum, etc. Control, which is also the difficulty of continuous hot-dip plating products. [0003] The surface quality of the product is related to factors suc...

AI Technical Summary

Problems solved by technology

After the steel strip is coated, the air knife is used to control the cooling of the strip steel by a special cooling bellows to control the cooling of the strip steel and the size of the spangles, but it is difficult for the tear marks produced by thick coatings such as zinc aluminum magnesium, aluminum zinc, zinc aluminum, etc. Control, which is also the difficulty of continuous hot-dip plating products

[0003] The surface quality of the product is related to factors such as post-plating cooling rate, production line speed, cooling position, tear marks, coating thickness, etc. Among them, the surface of the product with tear marks is uneven, and the poor surface quality of the product will bring greater harm to subsequent production. , a serious threat to the service life of the working rolls of the tension leveling machine, skin pass machine and roller coating machine. In addition, the defect of tear marks is easy to increase the wear of the squeeze roller and the pressure roller

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