There are many large mechanical equipment in iron and steel enterprises, including rolling mills, motors, blowers, circulation fans, speed reducers, gear boxes, etc. These equipment are key assets in iron and steel production, which are very valuable but usually lack of spare parts reserve. Due to the dynamic operating conditions of heavy load, discontinuous operation, variable working conditions, and the poor working environment of dust and harmful media, these equipment often fail and break down before reaching the expected service life, leading to unplanned shutdowns, forced shutdowns for maintenance, and even major production accidents, which cause huge economic losses to the enterprise.