Plate chain anti-loosening detection device

The utility model belongs to the technical field of plate chain detection, and particularly relates to a plate chain anti-loosening detection device which comprises a first detection mechanism and a second detection mechanism, the first detection mechanism is located at the downward moving end of a cover plate in the two ends of a plate chain, and the signal triggering range of the first detection mechanism is located on the normal track side face of the downward moving end of the cover plate along the plate chain. The signal triggering range of the first detection mechanism does not coincide with the normal track, and when the loosened or disengaged cover plate downwards moves along the end of the plate chain and falls to the signal triggering range of the first detection mechanism due to gravity, the first detection mechanism is triggered; the second detection mechanism is located below the plate link chain so as to detect the position of the cover plate passing through the position below the plate link cha