YSL Overflow Screw Conveyor is a new type of screw conveyor. Its discharge port is open upward, and it is equipped with a certain height of overflow bucket, which relies on the extrusion of spiral blades in the opposite direction at the discharge port to overflow from bucket. It is suitable for conveying and controlling powdery and granular materials. It has the characteristics of simple structure and good air locking performance, which can save the need of rigid impeller feeder and other feeding equipment to connect directly with the feeding port under the stock bin. Achieve material sealing, steady flow.