Middle-drive sand washer

The utility model relates to a centrally-driven sand washer, which belongs to the technical field of sand washing equipment and particularly comprises a plurality of sand washing wheels arranged side by side and uniformly mounted on a central shaft, bearing supports are respectively mounted on two sides of a sand washing box, and two ends of the central shaft are respectively mounted on the bearing supports through bearings. A plurality of driving rods are installed in the middles of the multiple sand washing wheels and are installed on the two sides of a middle wall plate of the sand washing wheel sand washing tank respectively, a plurality of gear meshing grooves are formed in gaps between the driving rods on the same side, the feeding end of the sand washing box is installed on a fixing support, a gear shaft is installed on the fixing support, and driving gears are installed at the two ends of the gear shaft respectively. Teeth of the driving gear are used for being inserted into the gear meshing groove to