Mechanical equipment will fail due to normal wear and tear during operation, such as motors, bearings, gears, etc. When hidden troubles occur, the equipment temperature will change abnormally. Infrared thermal imager can analyze the internal faults of equipment by detecting the temperature distribution outside the equipment without stopping the operation of the equipment, so as to maintain and overhaul the equipment in advance, shorten the downtime of the equipment as much as possible, effectively reduce the downtime loss of the equipment and improve the production efficiency.