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The working principle of an external appearance inspection device relies on image analysis from industrial cameras. It customizes functional tests for various defects, such as polarity issues, misaligned edge seals, leakage, unbuckled edges, open seals, non-circular seals, bulges greater than 0.2mm, faulty caps, incorrect specifications, bad soldering points, color inconsistencies, and missing pins. Size detection involves checking dimensions like length, width, height, thread diameter, and specific local requirements.

As the product moves beneath the CCD sensor, the indexing platform halts, triggering a signal for the CCD to capture an image for comparison. The CCD processes the data, determining whether the product meets the quality criteria. If the product passes, the CCD sends another signal to the indexing platform, allowing it to proceed to the next work station for another image analysis. This continuous cycle repeats until all items are inspected, and they are then discharged into a frame.