High-precision energy-saving galvanized air knife

Abstract

The invention discloses a high-precision energy-saving galvanized air knife. The high-precision energy-saving galvanized air knife comprises an upper knife piece and a lower knife piece, a lip cavity is formed between the upper knife piece and the lower knife piece, and air can be sprayed outwards from the lip cavity; the tail end of the lip cavity is connected with a stripe-shaped distributing hole, and air is pumped into the lip cavity via the stripe-shaped distributing hole; the stripe-shaped distributing hole is communicated with a first air cavity, and air flows inside the first air cavity are input into the stripe-shaped distributing hole; a second air cavity is arranged inside the first air cavity and provided with a plurality of rows of airflow distributing holes, and the air input into the second air cavity can be input into the first air cavity via the airflow distributing holes. According to the high-precision energy-saving galvanized air knife, by changing the structures of the air cavities and the air distributing manners, the pressure stability can be enhanced and the pressure distribution non-uniformity can be reduced; by increasing the length of the straight section of knife lips, the proportion of laminar air flows can be enhanced, and airflow scattering can be reduced, and the use performance of the air knife can be improved.

Description

technical field [0001] The invention relates to an air knife, in particular to a high-precision energy-saving galvanized air knife. Background technique [0002] The air knife is used to control the thickness of the galvanized layer of the strip steel on the hot-dip galvanized strip steel production line. The zinc liquid on the surface of the steel sheet is sprayed to control the thickness of the galvanized layer on the surface of the steel sheet, thereby ensuring the quality of the cold-rolled galvanized sheet. [0003] Due to its structural characteristics, the currently used air knife has less laminar flow components in the airflow, basically sprays out in a divergent state, has poor scraping ability, and is difficult to accurately control the coating amount of thin coatings, which is not energy-saving. The blowing pressure is unevenly distributed in the width direction, and it is easy to cause over-galvanizing at the edge when producing thick plates or thicker galvanizi...

AI Technical Summary

Problems solved by technology

[0003] Due to its structural characteristics, the currently used air knife has less laminar flow components in the airflow, and basically sprays out in a divergent state.

The air blowing pressure is unevenly distributed in the width direction, and it is easy to cause over-galvanizing on the edge when producing thick plates or thicker galvanizing quantities

Poor air pressure stability and uneven coating thickness on the board surface restrict the improvement of product quality

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