Careful selection device null of raw materials such as

摘要

PURPOSE:To automatically select a foreign matter by holding a small sphere layer in a storage tank and equipping both a partition plate for partitioning the storage tank and a vibrator for vibrating the storage tank. CONSTITUTION:When a raw material 1 is continuously introduced from an inlet 4, the raw material 1 and small spheres 23 are fluidized by vibration and fine vibration of a storage tank 3. The raw material 1 falls to the upper face of the small sphere layer in a chamber 1b from the upper face of the small sphere layer in a chamber 1a of the inside of the storage tank 3. Then the raw material 1 falls to the upper faces of the small sphere layers of the chambers 1c, 1d and is continuously moved. Simultaneously in the respective chambers 1a-1d, the foreign matters 2 having sp. gr. larger than the small spheres 23 sink to the bottom of the layer thereof. The foreign matters 2 are carefully selected from the raw material 1 in the respective chambers and sink to the bottom part of the small sphere layer. Thereby time and labor are reduced.