vessels of various diameters. Bubbles in the coating can be driven out and the coating can be densified, increasing the strength of the coating. The large-volume resin tank is installed at the bottom of the trolley, and the resin can be used to complete the spraying of multiple tanks, and the automatic feeding device (optional) is provided to save manpower. The S/F (F/F) double-wall spraying equipment produced by our company is a high-tech automatic spraying equipment widely used in underground