Full-automatic mark spraying device in cast pipe industry

The utility model provides a full-automatic mark spraying device in the cast pipe industry, and relates to the technical field of automatic mark spraying. The full-automatic mark spraying device in the cast pipe industry comprises a supporting frame, a transmission assembly is fixedly connected to the top of the supporting frame, a rotating assembly is arranged on one side of the transmission assembly, three sleeves are arranged on one side of the rotating assembly, threaded rods are slidably connected into the sleeves, and springs are arranged on the outer sides of the threaded rods. When the full-automatic mark spraying device in the cast pipe industry moves to the smooth surface of the threaded rod, threaded connection between the threaded rod and the rotating frame can be changed into sliding connection, at the moment, the threaded rod does not continue to move downwards, a cast pipe body continues to rotate towards one side along with the rotating frame, and then the outer surface of the cast pipe body i