Three-phase horizontal screw centrifuge

The three-phase horizontal spiral centrifuge comprises a machine body, a speed changer and a shell, the shell is fixed to the top of the machine body, a rotary drum is rotationally arranged in the shell, a supporting shaft is rotationally arranged in the rotary drum, a spiral piece is wound around the outer portion of the supporting shaft, a feeding port is formed in the supporting shaft, and the speed changer is arranged in the feeding port. The exterior of the rotary drum extends to the left end of the shell through a shaft and is connected with a driven wheel, a first shaft is movably arranged in the transmission, a first gear is fixed to the exterior of the first shaft, a second shaft is movably arranged in the transmission, a second gear is fixed to the second shaft, and a third gear is fixed to one end of the second shaft; one end of the supporting shaft extends into the transmission and is connected with a fourth gear, through the acceleration effect between the gears, the rotation speed of the spiral