Sand screening device with crushing function

The sand screening device with the crushing function comprises a box body and a screening and crushing mechanism, a feeding hopper is installed at the top of the box body, and a sand box is movably installed at the bottom of an inner cavity of the box body. The sieve plate, the boss and the supporting table are matched; twice screening operation on the sand is realized; the sand screening effect is improved; the sieve plate is matched with the blanking plate; the operation of screening and collecting thick gravels is realized; the smooth proceeding of the next crushing work is ensured; a motorI, a pressing roller I, a pressing roller II and a motor II are matched; thick and big sand is crushed and processed; the operation of classifying, extruding and crushing is adopted, the first pressing roller and the second pressing roller are protected, the operation of obtaining finer sand is achieved, the utilization rate of the sand is increased, cost waste is reduced, and the efficiency of sand crushing operation an