Cylindrical sieving device and method for selecting powder particles using the same

摘要

The present invention is a cylindrical sieve device comprising an upper sorting chamber provided with an oscillating perforated plate and a coarse grain-discharging port, and a granular material-sorting method using same. The cylindrical sieve device is characterized in that: a flow-regulating plate extending longer than the radius of a circular sieve frame is provided inside the upper sorting chamber; said flow-regulating plate is disposed at a slant with respect to the direction that passes through the center of the sieve frame and toward a region comprising the coarse grain-discharging port; a granular material flow channel opening through which a granular material on the perforated plate can be moved between the two regions partitioned by the flow-regulating plate is provided on an extension line of the flow-regulating plate; and the width of said granular material flow channel opening is set to be at least 3% of the diameter of the circular sieve frame. The cylindrical sieve device is able to significantly reduce the amount of normal grains discharged together with the coarse grains and is able to significantly improve yield when the normal grains are made into product.