Rust removal and spraying multifunctional robot for tunnel lining trolley

The invention relates to the technical field of tunnel secondary lining construction, and discloses a rust removal and spraying multifunctional robot for a tunnel lining trolley, which comprises a machine body, and driven assemblies for moving equipment along the surface of an arched steel template are arranged at four corners of the machine body; polishing assemblies used for polishing and grinding the surface of a steel formwork are movably arranged in an inner cavity of the machine body and the left end and the right end of the inner cavity of the machine body, a dust collection assembly used for collecting chippings and dust is installed in the middle of the outer wall of the machine body, and a spraying assembly used for regulating and controlling the release agent supply position and a debugging assembly are further installed in the inner cavity of the machine body. The surface, making contact with the bottom of the polishing roll shaft, of the steel formwork is polished and ground from back to front th