Vertical roller mill Handling Precautions

Topics: Thermodynamics, Windmill, Material Pages: 6 (922 words) Published: December 9, 2013
In the production process of the industry , in accordance with rules and regulations to

operate the equipment is very important , here is the jaw crusher manufacturers in india

maintenance points on the vertical roller mill process experience raised some attention

should be paid based on years of equipment manufacturing .

Vibration : vibration roller mill work is prevalent , and reasonably vibration is allowed,

but if the vibration is too large , it will cause damage to the disc and roller machinery ,

as well as ancillary equipment and measuring instruments to destroy the material . layer of

uneven thickness vibration is the main reason , for other reasons as well : the mill there

are large metal objects ; grinding too much pressure ; damage resistant parts ; accumulator

charging pressure ranges ; insufficient ventilation wear .
In the operation should be strictly controlled within the allowable range of vibration to

create the prerequisites for the stable operation.
Material thickness : vertical mill Another important factor is the stable operation of the

bed stable layer material stability, wind, air pressure and volume of feed to stabilize , or

we need to maintain the material thickness by adjusting the air volume and the volume of feed

. If not promptly adjust the vibration will cause increased motor load stop jumping up or

system problems . In theory, the material thickness should be the diameter of the roller 2%

± 20mm, the vertical roller mill diameter 3000 mm, thus 60 ± 20 mm material thickness is

appropriate . In addition , the optimum thickness of material depends primarily on the

quality of raw materials , such as moisture content , particle size , particle size

distribution and grindability . Initial operation , in order to find the best material

thickness , gauge rings have debugging height . And of dam height under certain conditions ,

one of the important conditions for a stable material thickness is feeding granularity and

granularity level with the rationale . Feeding the average particle size is too small or too

fine , thin material layer ; average particle size is too large or too many chunks of

material when the material layer will thicken mill load increases. Material layer can be

stabilized by adjusting the amount of water spray , grinding pressure , circulating air flow

and separator revolutions and other parameters. Water is the prerequisite for the formation

of solid bed material , suitable grinding pressure to maintain the bed stable conditions , is

guaranteed within the ventilation means of grinding fineness of the raw material and moisture

Pressure : pressure is the pressure loss at the air ring is one of the important control

parameter. Large vertical mill operation due to wind effects , therefore , to keep the

pressure constant , grinding running to do. Pressure is a mirror of the mill case , the

operator can learn by observing the pressure inside the mill , the judge material , less

material, wind, small wind , grinding efficiency. And with the change in the volume of feed ,

grind size of ventilation , stable pressure values ​​are different , which in normal operation

should observe, pay attention to the accumulation of experience. If the pressure is too large

, indicating that the grinding resistance, circulating volume, you should take measures to

reduce material and increase the ventilation rate , increase water, stable material layer may

also be temporarily reduced classifier revolutions , so within the plot in fine grinding mill

discharge , the pressure to be back to normal , then the appropriate restore the parameters

to avoid over-grinding phenomenon , to prevent vibration intensified mill jump stop, full

mill accident occurred . If the pressure is too small , too little material in the mill

described polishing layer...
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