Positioning structure of pipeline robot

The invention belongs to the field of pipeline detection equipment machinery, and discloses a pipeline robot positioning structure which comprises two reducing devices and a control box installed between the two reducing devices, and a controller and a multi-sensor system are carried in the control box. Each reducing device comprises a lead screw main reducing device and three reducing main supports, the lead screw main reducing device is provided with three stepping motors for active reducing, the stepping motors drive belts through gears and drive lead screws to rotate synchronously, active reducing is achieved, one end of each reducing main support is connected with a connecting plate, and the other end of each reducing main support is connected with a connecting rod. The lead screw is provided with a pressure sensor and a variable-diameter moving rod, and the radius of the pipeline robot is directly influenced through reciprocating movement of the variable-diameter moving rod. And a motor power device is