Classified crushing treatment device for steel slag

The utility model relates to the technical field of crushing treatment, in particular to a graded crushing treatment device for steel slag. Comprising a box body, a discharging pipe, a supporting frame, a smashing assembly, a screening assembly, a drying assembly and a collecting assembly, the discharging pipe communicates with the box body, the smashing assembly, the screening assembly and the drying assembly are arranged on the box body, and the smashing assembly comprises a grinding disc, a plurality of grinding rollers, a plurality of mounting frames, a speed adjusting motor, a driving wheel, a driven wheel, a belt, a supporting plate and a rotating shaft; the supporting plate is fixedly connected with the box body, the driving wheel is fixedly connected with the output end of the speed adjusting motor, the driven wheel is fixedly connected with the rotating shaft, the belt is arranged on the outer wall of the driving wheel and the outer wall of the driven wheel in a sleeving mode, the grinding disc is fi