Due to the turning and rolling of the material in the screen drum, the material stuck in the screen hole can be ejected to prevent the screen hole from being clogged. GTS series shaftless trommel screen machine mainly consists of motor, gearbox, screen drum, frame, sealing cover, inlet and outlet. The screen drum is mounted obliquely on the frame. The motor is coupled to the drum unit via a coupling through a reducer to drive the screen drum unit to rotate about its axis. After the material enters the screen drum, due to the tilting and rotation of drum screen, the material on the screen surface is turned over and rolled, so that the qualified material (the product under the sieve) is discharged through the screen, and the unqualified material (the product on the sieve) ) is discharged through the end of the screen drum.