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When selecting coal washing machinery, the wear resistance of the equipment is a factor that must be taken into account. The quality of wear resistance has a direct impact on the service life of many types of machinery, and the length of this service life in turn affects the costs associated with it. Spraying polyurethane elastomer on the mechanical surfaces of metals can effectively improve the wear resistance of the metal materials used in coal sorting machinery. Sprayed polyurethane elastomers are a widely used material due to their excellent properties. It is a high-molecular-weight synthetic wear-resistant material whose properties are similar to those of rubber: it is wear-resistant, highly elastic, and strong, and its areas of application overlap almost entirely with those of rubber. Compared to wear-resistant rubber, it offers advantages such as higher wear resistance, resistance to corrosion and wear, impact resistance, and good plasticity, allowing it to be used to manufacture various components tailored to different operating conditions ； It has high hardness. Taking the ball mill, an important grinding device in coal processing machinery, as an example, the interior lining of the ball mill’s cylinder is made of high-hardness polyurethane, which enables the crushing of ore while also protecting the cylinder from wear. Rubber, due to its softer texture, cannot meet these requirements for ball mills; therefore, spray-applied polyurethane elastomers are increasingly being used in the market as wear-resistant materials. In terms of wear resistance, when submerged, the wear resistance of polyurethane-sprayed elastomers is 8 times that of cemented carbide steel, 7 times that of vulcanized rubber, and 3 times that of ultra-high molecular weight polyethylene ； Moreover, it has strong adhesion properties; different primers and adhesives can be used depending on the substrate, and suitable primers and adhesives can be found for both metal and non-metal substrates ； Construction is also very convenient: it can be carried out at room temperature, and it is not sensitive to humidity or temperature ； It causes no environmental pollution, contains no volatile organic compounds (VOCs), and is a new type of eco-friendly material ； Can cure rapidly at room temperature, without a catalyst ； It has an attractive appearance, good replication of the original shape, a continuous and dense coating without seams or pores, and excellent UV protection.