Intra-pipe shuttling mechanism

The invention provides an intra-pipe shuttling mechanism. The intra-pipe shuttling mechanism comprises a plurality of layers of supporting platforms. The supporting platforms are connected through lifting components. Each supporting platform comprises a frame which is composed of supporting rods. One end of each lateral supporting rod is hinged to the edge of the corresponding frame. The other end of each lateral supporting rod is hinged to a friction plate. The frames and the lateral supporting rods are connected through mechanical telescopic components. The intra-pipe shuttling mechanism has the advantages that the intra-pipe shuttling mechanism can automatically climb or fall along the inner wall of a steel pipe, and damage to the inner surface of the pipe is avoided; the mechanism can pass through a pipeline with a turn angle being larger than 45 degrees and can serve as a construction platform for internal construction of large pipelines, or shuttle in large pipelines and small pipelines, or be used for detecting the interior of pipelines by carrying detection equipment, or be used for dredging, repairing and the like of the pipelines by carrying other equipment.