How to maintain and inspect the air knife?

The air knife is a very delicate tool, especially the lip part. Although it is made of aluminum alloy/stainless steel, it is very easy to be deformed by collision, so it must be carefully cared for. When the air knife is replaced by the sinking roller during shutdown, the lip of the air knife must be covered with the air knife cover first. When the steel belt tension is opened, the fan is turned on first, and then the knife cover is removed to prevent the steel belt from scratching the air knife lip. Tools made of copper sheets must be used to clean the air knife. If there is sticky residue on the upper or lower part of the air knife lip, it must also be scraped with a softer tool to avoid damaging the air knife.

When lifting the air knife, the lip must be protected and must not be hit.

The inner and outer surfaces of the air knife lip are plated with a layer of hard chrome. The hard chrome layer on the inner surface can reduce the friction resistance of the air flow, and the hard chrome layer on the outer surface can increase the hardness of the surface, prevent collision deformation, and make the surface very smooth and round, not easy to stick to slag, and reduce the nodules of the air knife. Therefore, this hard chrome layer must be protected from damage. When repairing the air knife, the zinc slag and zinc vapor crystals inside and outside must be gently wiped off with metallographic sandpaper to make the air knife lip smooth and new, so that it is not easy to stick to slag during use.

If there is a small deformation at the air knife lip, it can be partially polished with an oil stone. Pay special attention not to use the oil stone to polish a large area to minimize the damage to the hard chrome layer. If the air knife lip is refurbished, the hard chrome layer must be removed first and then polished to the original size, and re-plated with hard chrome. The air knife equipped with an air filter must remove the filter and clean it at least every two or three months to prevent the filter from clogging and increasing resistance.