| 摘要 |
An aggregate classifying apparatus is provided to selectively sort foreign materials when crushing a waste concrete lump into concrete pieces of a predetermined size or less using a cone crusher. An aggregate classifying apparatus for selecting foreign materials is characterized in that: the apparatus comprises a cylindrical screen(30) into which tree branches(22) as foreign materials and waste concrete pieces(24) are injected; the cylindrical screen is formed in the form of a drum, the drum having projections with a fixed height spirally formed on the entire inner surface thereof; a plurality of holes are formed in valleys between the projections; the foreign materials and concrete pieces are placed on the valleys to discharge the concrete pieces through the holes and move and discharge the foreign materials from the cylindrical screen to an opening part opposite to an injection port; and an inner drum(200) which is formed on the same central axis as the cylindrical screen and has a diameter smaller than that of the cylindrical screen is positioned inside the cylindrical screen. |
