Automatic sampling and sample returning system for on-line detection of pulverized coal pipeline

The utility model discloses an automatic sampling and sample returning system for on-line detection of a pulverized coal pipeline, and belongs to the technical field of analysis and measurement. The device comprises a sampling pipeline, a sample return pipeline, a gas return pipeline and a cyclone separator. A sampling valve and a jet pump are arranged on the sampling pipeline, a sample return valve is arranged on the sample return pipeline, and an air return valve and an air return pump are arranged on the air return pipeline. A sampling plate and a supporting plate are sequentially arrangedat the lower end of the cyclone separator, a coal taking opening and a through hole are formed in the sampling plate and the supporting plate respectively, a pulverized coal online detection device isarranged above the supporting plate, and the coal taking opening moves between the through hole and the pulverized coal online detection device. And the sampling plate is in sealing contact with thecyclone separator and the s