The drum body is made of wear-resistant steel plate of not less than 5mm. The inner diameter of Φ is 1000mm and the inner width is 500mm. The drum is made of two 50×50×5mm angles equal to 500mm wide inside the drum. It is welded symmetrically on the inner side of the drum. The power is not less than 1.5kw, with 25±1r/min, the motor drives the gear to rotate 200 rpm.