Bag opening mechanism

The invention discloses a bag opening mechanism. The bag opening mechanism comprises a frame, a lower conveying roller component, a driving piece and a floating core ball. The lower conveying roller component comprises a first lower conveying roller, a second lower conveying roller and a lower conveying roller mounting plate. The lower conveying roller mounting plate is fixed on the frame; and the first lower conveying roller and the second lower conveying roller are mounted on the lower conveying roller mounting plate, and support the floating core ball. The floating core ball is connected with a connecting rod; and one end, far from the floating core ball, of the connecting rod is connected with a copying tool. The driving piece drives the first lower conveying roller and the second lower conveying roller to rotate. The bag opening mechanism cannot generate the abnormal condition of unsuccessful bag opening caused by smaller thickness of a drum film and bad electrostatic absorption bonding of the drum film, so that the drum film with the thickness smaller than 0.015 mm can be opened, the bag opening success rate reaches 100%, and the bag opening success rate is high. In addition, the bag opening mechanism is excellent in operation stability, quick in bag opening and high in bag opening efficiency.