In the use of spreaders, there are often factors that are unfavorable to production. For example, some spreader structures will make it difficult to remove dust from the surface of the zinc liquid, making it difficult to remove the zinc dust during operation and affecting the surface quality of the workpiece; the spreader itself and the zinc The Zn-Fe alloy reaction in the liquid will also increase zinc slag, increase the iron content in the zinc liquid, and make the fluidity of the zinc liquid worse.