The items are conveyed in a single row through the transverse rollers of the modular belt-type centrally positioned conveyor. An internal positioning mechanism allows for zero-pressure release mode delivery, where each functional zone is driven by multiple unpowered rollers and connected by a certain number of redirecting rollers. With a unit load of 80 kg/m, the conveying speed can reach 2 m/s. Convert the parcel flow into a parcel flow with centered spacing, prepare for the subsequent DWS and sorting and supply processing steps, and ensure that the parcels will not overlap or be side by side during the single-piece separation process. More importantly, these functions do not require any Control system control.