TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The semi-humid grinder is a vertical type semi-humid grinder comprising a base seat, a base plate, an engine shell and an upper cover plate, where the upper cover plate is provided with a material inlet funnel, the base plate is connected with a material discharging funnel, two side walls of the engine shell are provided with windows, inner side wall of the engine shell is fixedly provided with a toothed plate, and a main rotary shaft is vertically arranged in the engine shell via bearings arranged on the base plate and the upper cover plate. The main rotary shaft is provided with multiple positioning plates, which are arranged at intervals, where at least two vertical pin shafts are connected with all positioning plates, each pin shaft is provided with multiple hammering sheets at intervals, lower end of at least one pin shaft is fixedly connected with a material discharging plate, and one end of the main rotary shaft is connected with a main electric motor via a belt wheel mechanism. The outer sides of the two windows are fixedly connected with engine rooms, where inner side of the engine room is provided with a vertical secondary rotary shaft via bearings arranged on upper end cover and lower end cover. The secondary rotary shaft is connected with multiple secondary positioning plates at intervals, where at least two vertical secondary pin shafts are connected with all secondary positioning plates, each secondary pin shaft is provided with multiple secondary hammering sheets at intervals, one end of the secondary rotary shaft is connected with a secondary electric motor via the belt wheel mechanism, and the hammering sheets and the secondary hammering sheets are vertically staggered. The multiple positioning plates of the vertical semi-humid grinder are sleeved on the main rotary shaft via connection keys and separating sleeves. The multiple hammering sheets are sleeved on the relative pin shafts via the separating sleeves. The multiple secondary positioning plates are sleeved on the secondary rotary shafts via the connection keys and the separating sleeves. The multiple secondary hammering sheets are sleeved on the relative secondary rotary shafts via the separating sleeves. The belt transmitter arranged on front end of a material inlet port of the rubbish roller sorting machine is provided with a collecting chamber, where tail end of the collecting chamber and a material outlet end of the semi-humid grinder are provided with air discharging pipes and the air discharging pipes are provided with fans. The fans are connected with lower end of a spraying type dust-removing tower via pipes, where upper end of the spraying type dust-removing tower is provided with an air discharging pipe.