Vertical Ultrafine Mill Treatment Measures
Normal operation of the Ultrafine Mill did not maintain reasonable material layer and surface shape, it will cause vibration Ultrafine Mill. Through the practice analysis, we think that the causes of the vibration of the vertical Ultrafine Mill and the treatment measures have the following aspects:
- 1, the Ultrafine Mill enters a foreign body to cause vibration. From the grinding and grinding of metal foreign objects, such as air guide blades, after maintenance tools, and so on. If the smaller metal can lift the roller and reduce the suction, it will be taken out from the feed back at the back of the material; if the larger metal is to be taken out of the grinding door.
- 2, the excessive thickness of the material layer causes vibration. Feeding the large amount of material, layer thickness, grinding, the material can not be reduced ability to study fine grinding retention unqualified powder more, and air system is inadequate, the decrease of wind speed, spraying ring can not be qualified with a timely powder system, the grinding cavity, increased circulating concentrations of powdery material again on the disc, thick material layer. Such a vicious cycle makes the material roll excessively high and causes vibration. At this time, the feed volume should be reduced in time to ensure that the system is well ventilated and the material is unblocked.
- 3, the thin layer of the material causes vibration. A small amount of feeding or feeding too small, powdery material, the material flow is strong, and the poor adhesion of the grinding roller roller, make the disc material quickly made by grinding of qualified product. The excess air volume will quickly bring out the fine powder out of the system, so that the material layer on the grinding disc is too thin or the effective material can not be formed, which causes the contact of the grinding roller and the grinding disc to cause vibration. At this time, the feed quantity, the air volume and the water spray amount can be increased, and a certain material layer of the vertical Ultrafine Mill can be maintained to make it stable.
- 4, the grinding material is unstable, and the thickness of the material layer is too large. No reasonable material layer and surface shape, such as migrant workers, feeding, weighfeeders blockage caused by large fluctuations. The measure is uniform feeding.
- 5, the system air volume is not reasonable. The system volume is too large, the material stays in the grinding time is short, the discharge capacity, less material and vibration; air flow over an hour, the material stay too long in grinding, repeated grinding the material too small, high pressure and vibration. In addition, when feeding water to increase or decrease, the inlet temperature suddenly increased or decreased, the tail air exhaust door suddenly becomes larger or smaller, will directly affect the ventilation quantity of vertical Ultrafine Mill. At this time, if the adjustment is not timely, it will cause vibration to be unavoidable. Therefore, when the moisture of the material is increased, the quantity of feed, the water spray, the air temperature of the grinding and the ventilation of the vertical Ultrafine Mill are solved.
- 6, the speed of the pulverized machine is too high. The speed of the classifier is too high, and the finished products cannot be discharged in time. The material is repeated grinding to increase the internal circulation volume, then the differential pressure is high, then the vertical Ultrafine Mill buffering layer becomes thinner, causing vibration.
- 7, the small amount of water spray causes vibration. Small amount of water, high differential pressure and thin layer of material cause vibration.
- 8, the particle size of the material is too large or too small to cause vibration. Because the disc speed must, feeding size increases, the centrifugal effect is more obvious, the grinding efficiency will drop, can’t keep a good shape of charge level more Wang, external circulation increases, caused by vibration. The treatment measures are: control the material layer to make it a little thicker than normal, reduce the air volume and inlet temperature, and reduce the grinding pressure. When the grinding material is too fine, most of the grinding is suspended in the grinding Ultrafine Mill. But the power selection machine is limited, and at this time the material on the disc can also cause vibration. The treatment measures are: reducing the temperature, reducing the air pump, reducing the speed of the pulverized machine and increasing the water spray.
- 9, the pressure setting is not reasonable or the pressure of nitrogen is unbalanced. The setting of grinding pressure is too large or too small, or due to the lack of nitrogen pressure and imbalance in normal production, it will cause excessive vibration of the roller when it moves up and down. The treatment measures are to adjust the pressure and check the pressure of the nitrogen package.
- 10, the retaining ring is too high and too low. The retaining ring is too low to maintain certain material level and cause vibration due to the thin material. The retaining ring is too high, the material thickness is low, the air volume is reduced, the discharge is not smooth, and the differential pressure is high, which causes vibration.