Sand and gravel separator is a sand and gravel separation equipment suitable for rivers, reservoirs, and coal yards. Composed of the hull, frame, gearbox, conveyor belt, rotary screen, engine or motor. This model has a simple structure, is economically applicable, and easy to operate. It is divided into drum type sand screening machine, washing drum type sand screening machine, vibrating screen type sand screening machine, etc. Separators are widely used in industries such as highways, hydropower, and construction for washing, grading, and impurity removal, as well as for washing fine-grained and coarse-grained materials. They are suitable for building and road construction sand and gravel, and can clean and separate soil and debris from sand and gravel. Their novel sealing structure, adjustable overflow weir plate, and excellent transmission device have good cleaning and dehydration effects.