vibrate during use of the vertical roller mill

vibrate during use of the vertical roller mill

The material layer formed in the vertical grinding production process has a certain particle gradation, so it has a certain range of requirements on the particle size of the raw material Service online

vibrate during use of the vertical roller mill

Factors that cause the mill to vibrate during use of the vertical roller mill

The material layer formed in the vertical grinding production process has a certain particle gradation, so it has a certain range of requirements on the particle size of the raw material. If the particle size is too large or too small, the gradation balance will be destroyed, resulting in the toughness and rigidity of the material layer. The weakening is very harmful. First, the excessive particle size makes the primary grinding success rate decrease, increasing the number of material circulations, resulting in a significant decrease in the "medium-grained" material that does not meet the fineness requirements above the wind ring. This situation in turn affects the smooth passage of particles that meet the fineness requirements, thus causing a vicious circle.

At the same time, with the increase of the amount of powder returned, the powdery material on the material layer is increased, the original gradation balance is broken, the stability of the material layer is deteriorated, and the vibration is increased. This situation is often seen before and after limestone stacking, which can cause changes in the vertical roller mill system due to too much material in the pile head and pile tail. Appropriate reductions can be made in operation to stabilize the differential pressure and the layer.

Secondly, when the particle size of the material is too small, even when the powdery material is too much, the fine particle has poor adhesion and good fluidity, and it is difficult to form an effective material layer. The grinding roller is not easy to effectively "clam" the material for normal rolling, which is easy to cause The relative sliding of the grinding roller and the grinding disc causes severe vibration of the vertical grinding.

The presence of a large amount of powdery material will increase the concentration of dust, increase the pressure difference, increase the ventilation resistance, destroy the normal running track of the airflow, and weaken the gas lifting capacity. The necessary adjustments will soon lead to vertical grinding and stopping. In severe cases, a falling roller will cause severe vibration. If a large amount of powdery material is suddenly burned, the vertical roller mill will suddenly stop suddenly, and there is no adjustment time, so this situation is more difficult to control.

When it is found that the material is too fine, especially when the pressure difference has risen significantly, it should be greatly reduced in time, reduce the grinding pressure, reduce the outlet humidity, increase the water spray volume, appropriately reduce the speed of the powder separator, and ensure the stability of the material layer during operation. And the stability of the pressure difference is centered, and when there is a certain layer of material, the grinding pressure is gradually increased. In addition, when a large mass of material is mixed in the uniform particles, the undulation of the grinding roller is also caused.

In fact, in the selection and design of the vertical roller mill, the material is easy to wear. In general, the SBM vertical roller mill mainframe is 3500kw, because the material of our factory is poorly ground and becomes worse. The ability of the vertical roller mill will be reduced, and it can only be forced to reduce the operation, otherwise it will cause the vibration of the vertical roller mill, resulting in unstable operation.

Therefore, the change of material wearability is a very important indicator for vertical roller mill operation and assessment. When the grindability of the material deteriorates, the number of grinding of the material by the vertical roller mill will increase significantly, and the amount of powder returned on the grinding disc will rise sharply, especially the pressure difference will become very large, the ventilation will be poor, and the material will be suspended in the mill. In the body, the material layer is extremely unstable, the load of the powder selecting machine becomes larger, the fineness of the raw material becomes thicker, and the load of the mill becomes larger. If the material is not reduced in time, the vibration of the vertical roller mill will be very severe.

Under normal circumstances, the grindability of materials should be regularly tested to provide a basis for the operation of the vertical roller mill and the procurement and mining of the supply department. The influence of the change of material properties on the vertical roller mill is far more than this. The change of material properties will cause excessive wear of the liner and accelerate the wear progress of the liner. To ensure that the production volume is forced to increase the grinding pressure, the liner will have greater impact and Damage; excessive wear of the liner in turn causes vibration of the mill, so the material supply department should take into account the influence of the vertical roller mill on the material properties. Cost control should be considered together.

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