Hot dip galvanized coating control method and apparatus

Abstract

The invention relates the hot galvanizing zinc layer controlling means and device. On the around of strip there is electromagnetic means to make the zinc coating produce electromagnetic force to make the zinc coating surface produce pressure, and if the electromagnetic force is more than the interfacial force, the thick of zinc coating is reduced, controlling the intensity of alternating field to control electromagnetic force. The invention has the advantages of easy adjustment, high control accuracy, and improving the surface quality and product efficiency of strip.

Description

(1) Technical field [0001] The invention relates to a method and a device for controlling the hot-dip galvanized zinc layer on the surface of strip steel on a hot-dip galvanizing continuous production line. (2) Background technology [0002] On the hot-dip galvanizing continuous production line, the strip steel is pulled out of the zinc liquid at a very fast speed, and a large amount of zinc liquid is taken away and solidified before returning to the zinc pot, and the higher the operating speed, the higher the amount of zinc taken away , As a result, the galvanized layer is thick and uneven. The existing hot-dip galvanizing production line adopts roller plating method and blowing method to control the galvanized layer. [0003] The roller plating method is to install a pair of galvanized rollers made of pure iron or low-carbon steel at the zinc liquid surface at the outlet of the zinc pot, let the strip pass through the gap, and adjust the pressure of the two rollers to red...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the working speed is limited, and the speed is limited to 80 m / min. If the speed is high, it will cause uneven coating with thick sides and thin middle of the galvanized layer; it is impossible to accurately control the thickness of the coating, especially 100 grams / Meter 2 The following coatings are even more impossible; operation and maintenance are very troublesome, and the rollers must be stopped for replacement after 5 to 7 days of use.

However, in the blowing hot-dip galvanizing method, there are many factors that affect the thickness of the galvanized layer, such as the blowing pressure of the nozzle, the blowing angle, the distance from the nozzle to the strip, the height of the nozzle from the zinc liquid level, the gap of the nozzle, the belt The speed of steel, etc., and the influence on the coating in production are often criss-crossed and very complicated. Therefore, it is difficult to accurately control the thickness of the coating

At the same time, the strong airflow from the nozzle will cause a lot of noise

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