Specific-gravity stoner

The utility model discloses a specific gravity stoner which comprises a machine body, a sieve plate is obliquely arranged in the machine body, a side plate is arranged on the top side of the sieve plate, one side of the side plate is connected with an electric cylinder, and a dredging mechanism is arranged on the other side of the side plate. The dredging mechanism comprises a mounting frame, one side of the mounting frame is fixedly connected with the electric cylinder, a roller is rotationally connected into the mounting frame, a sliding groove is formed in the inner wall of a groove of the roller, the sliding groove is made of iron, one side of the adsorption part is inserted into the sliding groove, the sliding groove is magnetically connected with the adsorption part, and the roller makes contact with the sieve plate; and a supporting spring is arranged in the groove, a fixing plate is arranged on the bottom side of the supporting spring, adsorption pieces are fixedly connected to the two sides of the fi