Device and method for sorting objects

Abstract

In order to provide an airflow sorting device having high accuracy and easy adjustment properties with a simple configuration, there are provided a conduit which has a central shaft line and which lets an object to be sorted to fall due to gravity on the inside of the conduit along the central shaft line; an air supply port which is provided at a lower part of the conduit and configured to blow air upward along the central shaft line; a suction port which is provided above the air supply port of the conduit and is an opening oriented downward of a suction pipe provided parallel to the central shaft line; and an input port provided above the suction port of the conduit through which the object to be sorted is input into the periphery of the suction pipe which is in the conduit. Sorting is performed in the sorting device according to whether or not the object to be sorted is being suctioned by the suction port together with a part or the entirety of an airflow generated in the conduit by the air blown from the air supply port, and an airflow adjusting body which is provided below the suction port in the conduit and blocks a falling path of the object to be sorted which falls due to gravity, is provided, and the airflow adjusting body includes: a vertex on the central shaft line; and an inclined surface having a sectional shape, sectional areas of which are similar to each other and increase in size downward, and a drag force which acts on the object to be sorted which falls due to gravity increases downward from the suction port.