Automatic detection device for cylindricity of super-large-diameter structural member

The invention discloses an automatic detection device for cylindricity of a super-large-diameter structural member, and the device comprises a guide supporting column which is disposed at the center of an inner cavity of the structural member; the lifting platform is in sliding connection with the guide supporting columns; the circumferential transmission assembly comprises a rotating motor arranged on the lifting platform, the rotating motor is connected with a gear, and the gear is combined with a gear ring connected to the outer side of the guide supporting column in a sleeving mode; the rotating platform is fixedly connected with the gear ring and is provided with a bearing surface extending towards the outer side of the guide supporting column; and the measuring element is arranged on the bearing surface of the rotating platform and is used for measuring the roundness and cylindricity of the structural member. The large-size structural member cylindricity detection device can automatically complete cylin