The utility model relates to the technical field of detection, and discloses an on-line detection device for
metal heat treatment, which comprises a base, the upper side of the base is fixedly provided with a heat insulation cylinder, a fan and a driving
assembly respectively through a support frame, the heat insulation cylinder is a
hollow cylinder made of transparent materials, and the circumferential side of the heat insulation cylinder is fixedly provided with a fixed ring; a movable ring is rotatably mounted at the right end of the fixed ring, an industrial camera is fixedly mounted at the right end of the movable ring, the camera shooting end of the industrial camera faces the axis of the heat insulation
barrel, a rack section is fixedly mounted on the circumferential side of the movable ring, the driving
assembly and the rack section are assembled in a meshed mode, and the output end of the draught fan and the heat insulation
barrel are assembled in a communicated mode through a conveying
pipe. According to the utility model, the
image acquisition direction of the industrial camera can be adjusted, so that the defect condition of
metal can be detected at the optimal position; and a heat
insulation layer can be formed between the high-temperature
metal part and the industrial camera, and heat is continuously taken away by flowing air, so that the
adverse effect of high temperature on the industrial camera is further reduced.