Pipeline opening device for sealing pipeline and keeping stability

The pipeline opening device comprises a steel ring module, an expansion mechanism, a supporting mechanism, a motor module and a conveying mechanism, the expansion mechanism, the supporting mechanism and the motor module are fixed to the conveying mechanism, the steel ring module comprises an adjusting ring with the adjustable diameter, the supporting mechanism comprises a supporting rod, and the supporting rod is fixed to the adjusting ring. The adjusting ring is fixedly installed on the supporting rod, the expanding mechanism comprises a rotating shaft, a transmission mechanism, a lead screw, a disc and a telescopic block, the adjusting ring and the disc are concentric, an installation groove is formed in the circumferential direction of the disc, the telescopic block is movably installed in the installation groove, the transmission mechanism is installed in the disc, and one end of the lead screw penetrates through the disc to be connected with the telescopic block. The motor module comprises a motor, the m