The material can be conveyed forward by rotating or reciprocating motion of the working member or by the flow of the medium in the pipeline. For example, the working components of the roller conveyor are a series of rollers, and the rollers rotate to convey materials; the working components of the screw conveyor are spirals, and the spirals rotate in the trough to push materials along the trough; the working components of the vibration conveyor are troughs, and the trough moves to and fro to convey the materials placed therein.