Accurate counting and detecting method for belt transmission of packed objects

The invention discloses an accurate counting and detecting method for belt transmission of packed objects. In the upper part of both side frames of a belt conveyor, two pairs of opposite photoelectric switches are installed according to a set distance and situated in the opposite positions, and the photoelectric switches are connected with a counting control unit. The counting and detecting method comprises the following steps: 1) in each counting operation, the two pairs of photoelectric switches simultaneously detecting the first three pieces of single objects passing through a detection area, determining the reference transmission time value T reference, and automatically storing in the counting control unit; 2) detecting the running time length T test of the conveyed object passing through the change of the level of one pair of the photoelectric switches; and 3) obtaining number of objects conveyed and counting cumulatively according to n = T test/T reference. The accurate counting and detecting method ha