On-line quantitative sampling detection device for tobacco lamina and on-line detection method for tobacco leaves

The invention discloses an on-line quantitative sampling and detecting device for tobacco lamina and an on-line tobacco leaf detecting method thereof. The on-line quantitative sampling and detecting device comprises a main conveying belt, a split-flow sampling and detecting belt, a blanking pipeline and a flow collecting conveying belt. The split-flow sampling detection belt is arranged above the main conveying belt and comprises a split-flow conveying belt, a negative pressure air pipe, a negative pressure fan, a detection conveying belt, a camera, a light source and an auxiliary trough. The negative pressure cavity is used for carrying out negative pressure online sampling on all the tobacco laminas conveyed on the flow dividing conveying belt, the machine vision system is used for detecting the shape, the area, the size, foreign matter impurities, the leaf stem ratio and other parameters of the tobacco laminas, and after detection, the tobacco laminas are conveyed and converged back to the main conveying b