Drag chain conveyor is a conveyor that uses scraper chain to transport bulk materials in the trough. The drag chain conveyor consists of machine head, middle part and tail part. As per the layout and structure, drag chain conveyor can be divided into parallel type and overlapping type.As per the number of chains and layout of chains, it can be divided into single chain, double chain, double center chain and three chain. The main structure and components of wide types of drag chain conveyor are basically the same, which is composed of head, middle part and tail part. In addition, there are hydraulic jack device for pushing conveyor and chain tightening device for chain tightening. The head part is composed of head frame, motor, hydraulic coupling, gearbox, bearing ,speed sensor and sprocket.