To provide a horizontal drum type old sand recovering device by which foundry sand ingots are crushed and sorted into old sand and ingots to perform smooth recovery and further, vibration and noise generated from a rotary drum used therefor can be remarkably reduced. 鋳物砂塊を破砕・粉砕して古砂と鋳塊とに選別回収が円滑に出来るようにし、しかもこれに使用する回転ドラムから発生する振動・騒音を大幅に低減する。 - 特許庁