Particle size distribution evaluation device

The utility model relates to the technical field of particle size distribution detection of crushed raw materials, in particular to a particle size distribution evaluation device. Comprising a barrel-shaped base and a screening frame, the barrel-shaped base is of a hollow pipe structure, a conical hopper is arranged at the bottom of the barrel-shaped base and communicates with an air supply pipe, and the air supply pipe communicates with a power air source; the screening frame is detachably mounted at the top of the barrel-shaped base; the screening frame comprises a plurality of filtering parts which are vertically stacked, and a filter screen is arranged in each filtering part; and the screening mesh number of each filter screen is sequentially increased from bottom to top. Gas is input from the bottom of the conical hopper, wood pulp crushed materials are blown upwards from the bottom, and the required particle size can be better screened; sequentially passing through a screening frame, and intercepting cr