Sand-proof sealing roller with flushing nozzle

The sand prevention sealing roller comprises a supporting shaft, bearings, a roller body and sealing discs, the roller body is located on the supporting shaft in the radial direction through the bearings installed at the two ends of the interior of the roller body, the sealing discs are installed on the supporting shaft, and openings, leading to the bearings, of the two end faces of the roller body are blocked by the sealing discs. A bending channel which is used for stopping grinding materials to decelerate the grinding materials and throwing the grinding materials out under the action of centrifugal force is arranged between the sealing disc and the end face of the roller, the flushing spray head is arranged above the end of the roller, and the spraying direction of the flushing spray head points to the position between the sealing disc and the end face of the roller. And the direction of the inner slope is consistent with that of the inner slope closest to the outer side of the bent channel. The sand-preve