Analysis of the causes and characteristics of the vertical mill vibration

Vertical mill vibration analysis of the causes and characteristics of the 2019 - 09 - 11 Wang Zhanguang ( Jiaozuo strong cement) The current vertical mill as the mainstream of cement raw meal grinding equipment, its operation quality directly affects the enterprise benefit. The vibration of the roller mill, not only damage equipment, often carrying roller, roller and instability of the cause, affect production. Now according to the author's experience about the cause of vertical mill vibration and performance characteristics. Vertical mill vibration cause analysis of the vibration of vertical mill, the reason is various, transmission, material layer, foreign body, roller surface, mill, such as particle size, pressure can cause the vibration of vertical mill, an analysis is made below for your reference. 1. Transmission caused by the vibration characteristics of vertical mill parts including the motor, coupling, reducer, any link between the malfunction can cause vibration. Specifically, if insufficient coupling installation accuracy, namely for the error is bigger, can cause to the vibration of the axial vibration is given priority to; If the motor rotor and stator misalignment, alternating magnetic field will change as the direction of the magnetic field, will pull the rotor move, causing the axial vibration; Reducer bearing damage, the gear tooth broke can cause the vibration of the mill. When bearing damage, roller, cage, set each other inside and outside the interference caused by vibration, the axial positioning failure, installed on the shaft of the gear mesh can produce abnormal, such as moment bite root, meshing, causing severe vibration, at this point is often accompanied by a crush, friction shriek, when its relative stability, the vibration frequency is associated with the speed of the shaft. When a tooth broken, there will be a periodic vibration and associated with the rotation speed of shaft, when the broken fragments in tooth root, crown gear is inevitable, a depressing noise, frequency and speed synchronization. 2. Material layer instability caused by vibration and characteristics when material layer is not stable, roller mill and the spacing of constantly changing, when the roller is high low, cause vibration mill. Layers in the cause of the instability, may be unstable from feeding, may also be material in the mill wheel speed too fast, after all is not form a stable material layer; Keep-off circles highly discomfort, such as too low, difficult to block material, not form a stable material layer, and the material is too dry, carefully, and so on. 3. Pad size is too large vibration caused by raw material particle size is too large, such as higher than material thickness, suddenly the roller when roller by jacking, and then suddenly dropped, so inevitably cause vibration mill. Such vibration no obvious characteristics, determined by the large quantity and material fragility. 4. Vibration caused by foreign body into the ground and characteristics when iron and other foreign matter into the mill, roller not to be crushed, inevitably cause roller ups and downs, mill vibration, if foreign body in the system of circulation, will cause vibration in cycle time, from the vibration, the vibration of the; If the eyewinker card near the millstone as keep-off circle, the vibration frequency as the speed and the product of the number of roller mill. 5. Roller vibration caused by loss of round and characteristics of roller wear-resisting layer once appear, slag, impellers, roller are round, each rotation will suddenly lift once a week, form the regular vibration, if a hole, the basic vibration frequency is twice mill speed ( Or close to mill speed 2 times) , the vibration frequency, the higher the pit. 6. Mill broken or serious peeling when mill lining board broken or serious peeling, mill will be potholes, roller every here will suddenly sank, causing vibration, vibration frequency as the speed and the product of the number of roller mill. 7. Improper operation caused by the improper operation of vibrating roller mill can also cause vibrations, when wind ring high wind speed, grinding closed discharge reduction, the need to cycle the material and turn on a mill, powder material too much not form a solid material layer, differential pressure rise inside mill, mill vibration; Material is poor classifier speed is too high, returned to mill powder, caused the instability of raw material layer and, differential pressure rise within grinding, grinding machine vibration. This kind of vibration and operation relationship is bigger, vibration period and frequency operation adjustment. After vibration carrying roller, check material, fine powder gradually emptying, fall roller is normal, after grinding in differential pressure reaches a certain value, vibration again. 8. Roller pressure is too low when the roller pressure is too low, it is difficult to pressure fragmental materials, ups and downs of the roller, back and forth, hitting a millstone vibration is inevitable, if the pressure of the accumulator is lower, the hydraulic oil in the cylinder of ferment can also cause the oil temperature rise. Conclusion: this article is just opposite the cause and the characteristics of the ground vibration analysis, due to the limited experience level, analysis or incomplete or have inappropriate, please comment, next to continue to discuss the solution of the vertical mill vibration method. （ Source: wisdom cement)