The basic operation of air knives involves the use of compressed air to produce high-velocity air blasts to cool off, dry, or move parts or items on a conveyor belt. It is also directed toward factory blades and other machinery that are subjected to high heat, to regulate their temperature and maintain optimum operation throughout the production cycle. Oftentimes, it is made of stainless steel, so as to withstand corrosive industrial sites. A kit would have a standard generator for compressed air supply.
Pressurized air passes through a tight gap created by two blades of air knives, which is the key to increasing the velocity of the air stream that comes out. Modern designs have employed the use of tear-drop-shaped nozzles for greater precision, speed, and intensity. Some designs air knife are curved, and four main units can be attached together to form a 360-degree angle blow off, which is capable of drying exteriors and interiors of round parts. This flexibility in the design allows for air knife to tailor-fit according to various production needs.
There are certain components and procedures to ensure proper care and maintenance of air knives, and it starts from the day of installation. It is important to note at the onset the diameter of air pipe lines, making sure that they suit the air knife unit. Incompatibility of air knife and its pipes will result in restriction of pressurized air, leading to pressure leaks, which pose danger to on site workers. Notwithstanding, air pressure leaks can cause delays that compromise the entire production.
Air knives can be jeopardized also when dirty air gets through the generator. This is especially true in factories that deal with a lot of oil and other liquids, and there are high levels of oxidation. I can also happen when outside atmosphere is sourced for compressed air supply. In such cases, it is worthwhile to add into an air knife kit a reliable filter that is equipped with auto drainer. This accessory is certain to add more years to the unit.
Intermittent cleaning of
air knives is another way to guarantee long years of service, although it doesnt have to be as often. The main unit itself is practically maintenance-free. Disassembling it can be accomplished following the manual that comes with the kit. Regulators, other nozzle types, and shot-off valves are often purchased together with the air knife unit to make way for various tasks.
