Production method, air knife device and air knife system for continuously hot-dip galvanizing aluminum magnesium

Abstract

The invention provides a production method, air knife device and air knife system for continuously hot-dip galvanizing aluminum magnesium, and relates to the technical field of continuous hot dip production. The air knife device comprises a main air knife and an inclined cooling device, wherein the main air knife comprises an upper knife lip and a lower knife lip which are matched with each other;the outer side of the upper knife lip is provided with a first inclined surface; the inclined cooling device comprises a first cooling section and a second cooling section which are sequentially connected from bottom to top; the first cooling section is matched and connected with the first inclined surface and provided with a second inclined surface; a first cooling gas outlet is formed in the second inclined surface; a second cooling gas outlet is formed in the surface of the second cooling section; and the gas injection directions of the first cooling gas outlet and the second cooling gas outlet are inclined upwards. The air knife device not only has the capabilities of scraping, blowing and controlling a coating as a traditional air knife, but also has the effect of reducing marks, andthe combined air knife device of the air knife and the cooling device can cool 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

Images