The air knife mainly relies on the compressed gas passing through the air knife gap to form a knife-like airflow, which has the effect of "splitting" and "scraping" the zinc liquid brought out from the zinc pot on the surface of the steel strip. The air pressure of the fan changes the thickness of the zinc layer, so as to achieve the zinc layer required by the customer. And according to the use of galvanized products, quality requirements, and process requirements, the degree of automation of air knife equipment is also different, and the price range is large, ranging from tens to millions.
 
At present, there are only 2 sets of air knives in the conventional galvanizing production line (one for backup and one for use). Since the air knives often have zinc slag entering during the normal operation of the production line, air knife mark defects appear. When the cleaning is invalid, it is necessary to stop and replace the air knives. At present, the adjustment process of the air knife is cumbersome (because when adjusting the gap of the knife lip, we only need to move the knife lip in the vertical direction to realize the change of the knife lip gap, but in fact, when the knife lip is adjusted, its movement direction is along the knife lip The frame moves obliquely upward, that is, the numerical value of the inch changes in the horizontal and vertical directions, which increases the difficulty of adjustment and wastes manual adjustment time), the hardness of the knife lip is low, and the knife lip body is not specially treated, only the surface adopts the electroplating process This leads to the low hardness of the knife lip. When cleaning the knife lip, the scraper is very easy to scratch the knife lip, resulting in product quality defects such as air knife marks), frequent maintenance of the knife lip and high cost, and the matching method of the knife lip is: Line contact, in the process of producing low-coated products, the wind pressure cannot be kept stable, resulting in defects such as product surface quality defects. Therefore, in order to ensure product quality and reduce controllable costs, Qingdao Hexin Machinery Co., Ltd. decided to design a new set of air Knife.
 
 
1. an air knife for steel rolling and galvanizing line, it is characterized in that: comprise fan, air inlet pipe, air distribution hose, air knife cavity, upper knife lip and lower knife lip, the air inlet end of described air inlet pipe is connected In the fan, the air inlet pipe is provided with several air outlets, the several air outlets are correspondingly connected to the air distribution hose, the lower end of the air distribution hose unit is connected to the air knife cavity, and the air knife The upper knife lip is fixedly installed on the vertical wall of the cavity, the lower knife lip is fixedly installed on the horizontal wall of the air knife cavity, and a horizontal air blowing channel is formed between the upper knife lip and the lower knife lip, The horizontal air blowing channel is communicated with the air knife cavity, and a left support frame and a right support frame are respectively fixedly installed at the lower ends of the air inlet pipes, and the left support frame and the right support frame rotate with the air knife cavity. connect. 2. The air knife for steel rolling and galvanizing line according to claim 1, characterized in that: it further comprises a knife lip angle adjustment mechanism, and the knife lip angle adjustment mechanism comprises a hand wheel, an adjusting connecting rod, a turbine worm and a vertical connecting rod. The handwheel is fixedly connected to the adjustment link, the adjustment link is rotatably connected to the turbine worm through an adapter, the turbine worm is meshed and connected to the vertical link, and the vertical link An end is connected to the air knife cavity. 3 . The air knife for steel rolling and galvanizing line according to claim 2 , wherein a plurality of support seats are evenly arranged at the positions of the air inlet pipe corresponding to the adjustment connecting rods, and the adjustment rods are sleeved on the support seats. 4 . link. 4 . The air knife for steel rolling and galvanizing line according to claim 1 , wherein the upper knife lip is provided with a plurality of fixed adjustment holes, and the upper knife lip communicates with the air knife cavity through the fixed adjustment holes. 5 . body connection. 5 . The air knife for a steel rolling and galvanizing line according to claim 1 , wherein the air knife cavity is provided with a flow-stabilizing grid. 6 . 6 . The air knife for steel rolling and galvanizing line according to claim 1 , wherein the air inlet pipe comprises a left inclined section, a middle horizontal section and a right inclined section, and the left inclined section, the middle horizontal section and the right inclined section. 7 . The segments are connected to each other. 7 . The air knife for steel rolling and galvanizing line according to claim 1 , wherein the air knife cavity is connected with an air pressure detection tube, and a pressure gauge is arranged on the air pressure detection tube. 8 . 8 . The air knife for steel rolling and galvanizing line according to claim 1 , wherein the upper knife lip and the lower knife lip are made of alloy steel. 9 . 9 . The air knife for a steel rolling and galvanizing line according to claim 1 , wherein the number of the air outlet and the air distribution hose is 4-8. 10 .
 
The air knife for steel rolling and galvanizing line designed by Qingdao Hexin Machinery Co., Ltd. is characterized in that: the air inlet end of the air inlet pipe is connected to the fan, and the air inlet pipe is provided with several air outlets, and several air outlets are correspondingly connected to the air distribution hose, and the air distribution The lower end of the air hose unit is connected to the air knife cavity, the upper knife lip is fixedly installed on the vertical wall of the air knife cavity, and the lower knife lip is fixedly installed on the horizontal wall of the air knife cavity, between the upper knife lip and the lower knife lip A horizontal air blowing channel is formed, the horizontal air blowing channel is connected with the air knife cavity, the lower end of the air inlet pipe is respectively fixed with a left support frame and a right support frame, and the left support frame and the right support frame are rotatably connected with the air knife cavity. The design is scientific and reasonable, improves the hardness of the knife lip, prolongs the service life of the knife lip, avoids the phenomenon of sticking slag on the knife lip, and improves the processing quality of the product; and the air knife has an adjustable purging angle and a wide range of applications.