air knife unit for galvanizing lines by Qingdao Hexin Machinery Co.,Ltd.

 Air knife unit, air knife unit for galvanizing lines


Address:  BeiAn Industrial park, Qingdao,China


Qingdao Hexin Machinery Co., Ltd. specializes in manufacturing strip steel hot-dip galvanizing air knives wiping equipments of various structural forms, which are used in continuous strip steel hot-dip galvanizing production lines.

We have 20 years of manufacturing experience, and have made a lot of improvements and designs on the basis of the original air knife to derive different air knife structure forms. performance.

They are respectively matched with 90-200 m/min line speed units. The control range of hot-dip galvanized coating is 30-275 g/m2, and the control range of hot-dip Al-Zn-Si coating is 20-200 g/m2. The advantage is that the amount of zinc on the plate surface is uniform and the dispersion difference between the left, middle and right three points is less than ±2%.

With the increase in demand for high-end home appliance plates and automotive high-end plates, the requirements for strip galvanized air knife equipment have also been greatly improved. The main technical requirement is to realize automatic control of coating thickness. The automatic control of air knife according to national conditions is an inevitable trend.

Our company has done research and analysis on a number of imported equipment, integrated the advantages and disadvantages of many equipment, and has developed its own products to meet the needs of the market and improve the level of domestic equipment manufacturing.

Qingdao Hexin Machinery Co., Ltd. adopts advanced processing methods and strict production management methods, which makes the air knife keep improving in processing accuracy.

The role of air knife made by HEXIN:

The laminar gas blown from the air knife lip to the steel strip has a dual role, one is zinc scraping, and the other is cooling. 

The dominant role is whether to scrap zinc or cool, which is determined by the size of the gap between the knife lip and the gas pressure.

 It is decided that when the gas pressure is constant, the size of the lip gap determines the leading role of the gas.

The HEXIN air knife equipments are highly approved by customers, air knife rigs with integrated knife-to-strip distance, tilt angle control, quick open, and edge-coating control device. 

The air knife lip gap height can be adjusted,  and the HEXIN Air knife positioners are featuring  integrated height, skew, etc.,(Air knife unit, air knife unit for galvanizing lines)

The introduction of air knife made by HEXIN:

Control the position of the air knife with high precision: 0.02mm

Automatic closed-loop high-precision control based on zinc layer thickness gauge

Control the zinc layer with the highest precision under different strip steel and production conditions

The precise settings of the gap and contour of the knife lip are extremely excellent

The precise purge mode ensures the best coating quality

Three-nozzle knife lip, completely eliminate defects such as zinc liquid flow marks


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