| 摘要 |
<p>The present invention relates to a sand selection machine including a drum screen having net holes precisely selecting sand, and a driving apparatus driving to rotate a drum screen. According to the apparatus for preventing net clogging of a sand sorting machine, a rail, on which a roller guiding a rubber scraper moves, is installed on the edge plane of one end or both ends where net holes of the drum screen are not formed, and at least four strike inducing protrusions are installed on the rail. If the rubber scraper including a net clogging prevention striker and the inducing roller automatically wipe out the drum while moving on the rail without power by rotation of the screen drum, the rubber scraper successively strikes the screen by using the falling height difference of the empty surface while the roller rides on strike inducing protrusions and turns over so that sand attached to the inner surface and holes of the screen is effectively shaken off to solve the net clogging. The inclined side of a right-angled triangle of the strike inducing protrusion is arranged in the rotational direction of the drum screen, and the orthogonal side is arranged in the rotational opposite direction of the drum screen.</p> |
