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Vertical Roller Pre Grinding Mill

Vertical Roller Pre Grinding Mill

Vertical Roller Pre Grinding Mill Vibration Is Too Large

In the normal operation, the reasonable material layer and material shape of the Vertical Roller Pre Grinding Mill are not maintained, which will cause the Vertical Roller Pre Grinding Mill to vibrate. Through practice analysis, we believe that the causes of vibration and treatment of Vertical Roller Pre Grinding Mills are as follows:

  • 1. The inside of the Vertical Roller Pre Grinding Mill enters foreign matter and causes vibration. Metal foreign objects from inside the Vertical Roller Pre Grinding Mill and outside the mill, such as wind guide blades, and tools left over after repair. If it is a small metal, it can lift the grinding roller and reduce the air suction, and take it out from the material returning port; if it is a large metal, it should be opened and removed.
  • 2. The material layer is too thick to cause vibration. The amount of material entering the interior of the Vertical Roller Pre Grinding Mill is too large → the material layer becomes thicker → the grinding capacity is reduced → the material cannot be finely ground in time → the Vertical Roller Pre Grinding Mill has more unqualified powder, and the system has insufficient air volume, and the wind speed of the spray ring Decrease → can not take the qualified powder out of the system in time → the circulating concentration in the grinding chamber is increased → the powdery material returns to the grinding disc → thickening the layer. Such a vicious cycle causes the layer to hold up the grinding roller too high to cause vibration. At this time, the feed amount should be reduced in time to ensure that the system is well ventilated and the discharge is smooth.
  • 3. The material layer is too thin to cause vibration. The amount of material entering the inside of the Vertical Roller Pre Grinding Mill is small or the material is too fine, and there are many powdery materials. At this time, the material has strong fluidity and poor adhesion, and the rolling of the grinding roller makes the material on the grinding disc quickly become qualified. Finished product. Excess air volume will soon take the fine powder out of the system, making the upper layer of the grinding disc too thin or unable to form an effective layer, causing the grinding roller and the grinding disc to contact and cause vibration. At this time, the feeding amount can be increased, the air volume can be reduced, the water spray amount can be increased, and a certain layer of the Vertical Roller Pre Grinding Mill can be kept to be stable.
  • 4. The material entering the interior of the Vertical Roller Pre Grinding Mill is unstable, and the thickness of the material layer fluctuates too much. There is no reasonable material layer and material shape, such as the laborer feeding, the feeding scale is blocked, causing large fluctuations. The measure is uniform feeding.
  • 5. The system air volume is unreasonable. When the air volume of the system is too large, the material has a short residence time inside the Vertical Roller Pre Grinding Mill, a large discharge amount, and less material and vibration; when the air volume is too small, the material stays in the Vertical Roller Pre Grinding Mill for a long time, and the repeated grinding makes the material too fine. The differential pressure is high and vibrates. In addition, when the moisture entering the inside of the Vertical Roller Pre Grinding Mill increases or decreases, the inlet temperature suddenly rises or falls, and the tailgate damper suddenly becomes larger or smaller, which will directly affect the ventilation of the Vertical Roller Pre Grinding Mill. At this time, if the adjustment is not timely, it will be inevitable to cause vibration. Therefore, when the moisture entering the material inside the Vertical Roller Pre Grinding Mill increases, the feed amount is reduced, the water spray is reduced, the wind temperature is increased, and the ventilation capacity of the Vertical Roller Pre Grinding Mill is increased.
  • 6. The speed of the classifier is too high. The speed of the powder selection machine is too high → the finished material can not be discharged out of the mill in time, the material is repeatedly ground → the internal circulation is increased → the differential pressure is high → the buffer layer of the Vertical Roller Pre Grinding Mill is thinned, causing vibration.
  • 7. The small amount of water spray causes vibration. The amount of water spray is small → the differential pressure is high → the material layer is thin and causes vibration.
  • 8. The material entering the interior of the Vertical Roller Pre Grinding Mill is too large or too small to cause vibration. Due to the certain rotation speed of the grinding disc, the larger the particle size of the material entering the Vertical Roller Pre Grinding Mill, the more obvious the centrifugal effect. At this time, the grinding efficiency will decrease, and the shape of the material surface will not be maintained, and the external circulation will increase, causing vibration. . The treatment measures are: controlling the material layer to make it slightly thicker than normal, reducing the air volume and the inlet temperature, and reducing the grinding pressure. When the material entering the interior of the Vertical Roller Pre Grinding Mill is too fine, most of it has been suspended in the mill after entering the inside of the Vertical Roller Pre Grinding Mill. The capacity of the classifier is limited, and at this time, the material on the plate is less likely to cause vibration. The treatment measures are: lowering the temperature, reducing the ventilation, reducing the speed of the classifier, and increasing the water spray.
  • 9. Unreasonable pressure setting or unbalanced nitrogen pressure. The grinding pressure is set too large or too small, or the normal pressure in the normal production due to insufficient and unbalanced nitrogen gas pressure causes the upstream and downstream movements of the grinding roller to cause vibration. The treatment measures are: adjust the pressure and check the nitrogen pressure.
  • 10. The retaining ring is too high and too low. The retaining ring is too low to maintain a certain layer of material, and the material is thin and causes vibration; the retaining ring is too high, the material is thick, the air volume is reduced, the discharging is not smooth, and the differential pressure is high, causing vibration.

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