A throw ball main shaft system for sand blasting machine

The utility model discloses a throw ball main shaft system for sand blasting machine, it is including the throwing ball main shaft and the main shaft bearing pedestal of mutually supporting, the outside of main shaft bearing pedestal is equipped with compressed air inlet and is used for radiating main shaft water cooling jacket, has the water inlet and the delivery port of relative setting on thismain shaft water cooling jacket, the main shaft bearing pedestal and throw the axle head of ball main shaft between be equipped with with the bearing cover of compressed air inlet intercommunication,should throw border that the ball main shaft goes out the axle head still be equipped with with the dustproof maze of bearing cover matched with machinery gland, form the labyrinth chamber body between dustproof maze gland of machinery and the bearing cover, this labyrinth chamber body is introduced compressed air and is formed positive atmospheric pressure through the compressed air inlet on thebearing pedestal. The util