The vibration of mill body of vertical roller mill is a normal phenomenon exists in working condition, reasonable vibration is allowed, if the mill has a violent vibration, it will cause damage to millstone, roller lining and accessory equipment. Therefore, vibration values in working condition should be controlled strictly within a scope of allowance (below 20mm/s is better), the mill can operate stably. There are many reasons for mill vibration, but below are the common reasons: fed material is not uniform, damage between millstone and mill roller is serious, fluctuation of air volume and air temperature, grinding pressure is too high or too low, there is foreign material in mill, material layer is too thin or too thickness, energy accumulator pressure is too big or too small, scraper plate is damage, air volume is not uniform, capacity of fed material has a big fluctuation etc.

Mill vibration can be controlled in production through reducing materials and reducing grinding pressure, meanwhile, spray water and circulation wind value can be adjusted to improve condition of mill according to material layer thickness and out temperature. It can even through lifting mill roller to avoid violent vibration if required, after the condition of mill is stable and fed material properly according to differential pressure.