The suspension is continuously added along the feed pipe and dispersed to the drum wall through six feeding holes on the small end wall of the screw. Due to the centrifugal force, the liquid is thrown out through the filter screen and the hole on the drum wall, and is discharged out of the machine through the filtrate outlet on the casing; the solid is retained on the filter screen to form a filter residue layer. Due to the difference of rotation speed between the screw and the drum, the screw conveyor will push the filter residue from the small end to the large end, which will be discharged from the slag discharge port of the filter shell at the large end of the drum. In this way, the suspension is automatically and continuously separated into filtrate and filter residue. The separation effect of the suspension is closely related to the rotating speed of the drum, the differential speed between the drum and the screw, the feed rate and the concentration of the suspension. The most appropriate parameters should be selected for different suspensions through experiments. The differential speed can be changed by adjusting the rotation speed of the rotating shaft when the rotating speed of the drum and the differential ratio remain unchanged.