Blast furnace ironmaking is one of the important production process chains (ironmaking, steelmaking, casting and rolling) in the iron and steel industry, and the blast furnace charging system is a key link in blast furnace ironmaking production. The raw materials are continuously sent to the blast furnace through the furnace top to ensure the normal demand of blast furnace ironmaking. D32 frequency converter has a mature application in the double-car hoisting and feeding system of iron-making blast furnace.