This invention relates to a damage inspection device for double-layer
fishing net
aquaculture cages, comprising an inner cage frame, an outer cage frame, an inner net layer, and an outer net layer, with the inner and outer net
layers enclosing multiple rectangular areas. A damage inspection device is installed within each rectangular area. Each damage inspection device includes a displacement drive
system and a positioning detection device. The displacement drive
system drives the positioning detection device to move along a planned
route within the rectangular area. The positioning detection device includes a detection box, a detection roller
assembly, a
pressure sensor assembly, and a
GPS positioning system. The detection roller
assembly includes inner and outer detection rollers, with a distance L1 between the inner and outer detection rollers greater than the width L0 of the rectangular area, allowing the double-layer net layer to be stretched. This invention can detect the integrity of the
fishing net based on the pressure
signal between the net layer and the detection rollers, detect damage to the double-layer net layer in real time, promptly report the location and size of the damage, and facilitate repairs to effectively avoid economic losses.