Composition: It is composed of a bag supply control computer, multi-section bag supply belt, AC motor, dynamic weight weighing, photoelectric position detection switch, light curtain and bar code reader.Working principle: The bag supply control computer makes the bag supply belt rotate by controlling the inverter and AC motor, and accurately sends the package to the sorting car. Dynamic weight weighing, photoelectric detection switch and light screen respectively measure the weight and position of the package, and collect these data so that the package can be accurately wrapped.Efficiency and requirements: The packet supply efficiency increases step by step within 2000-4000 packets/hour. The label surface of the incoming package must face the specified direction (the label must face up when the scanner is the top scan, and the label cannot face down when the five-side scan), and the incoming package must be separated by a single piece.