A destacker unit for a destacking system is for destacking objects with a flange that are stacked together, such as a stack of trays, containers, cups or other objects. A destacking system includes at least one destacker unit for repeated destacking of one tray at a time in a predetermined direction. A stack of objects each having a flange extending outwards along its perimeter may be destacked in a predetermined direction by rotational motion of the destacker unit. The destacker unit may include a wheel unit, having a threaded rotation axis, including: a lower surface for carrying the stacked objects, and an inclined member located above the lower surface and having an inclined upper surface and a bottom surface. The distance between the upper and bottom surface increases around at least a part of the periphery of the wheel unit. The thread orientation corresponds to the inclination of the surface.

The present disclosure relates to a bucket-feeding apparatus with bucket separation function, comprising: a bucket-infeed assembly that includes a guide bracket, and a bucket-separating assembly that includes a wheel unit and a power-source unit. The guide bracket is used to guide the conveying direction of buckets. The wheel unit is drivingly connected to the power-source unit, and the surface of the wheel unit is provided with a helical groove whose thread pitch gradually increases. The outer surface of the bucket body has a rim portion, the rim portion contacting the helical groove. When the wheel unit rotates, the bucket is driven and guided by the guide bracket, and because the thread pitch of the helical groove gradually increases, the spacing between adjacent buckets moving along the wheel unit gradually enlarges; the negative-pressure suction between stacked buckets is decomposed many times, thereby reducing the load required during separation.