A company's 2000t/d new dry process cement production line and raw meal preparation system adopt Raw Ore Milling Equipment , the disc diameter is 3350mm, the number of grinding rolls is 3, the size of the roller is 1900 * 670mm, and the raw materials for grinding are limestone, sandstone, iron powder and fly ash.
The grinding roller surface wear life in general for about 12 months, in order to facilitate the research, we put the Ore Milling Equipment roll surface of a cycle is divided into four stages, namely the grinding roller surface wear in 0~39mm within the scope of the work period is called the early wear; surface abrasion in the range of 40~79mm work called middle roller wear roller Ore Milling Equipment; surface abrasion in the range of 80~99mm work roll wear called post grinding; surface wear in 100mm above work called excessive wear stage roll Ore Milling Equipment.
In many years of production practice, the grinding roller wear in the beginning and middle normal production, production, operation rate, power consumption is low, but in the later period of wear, Ore Milling Equipment production, operation rate decreased obviously, Ore Milling Equipment vibration, large power fluctuations, very prone to problems, are also more likely to vibration after parking, parking easy success of a car, the operator is difficult to operate in this period.
The grinding roller wear later, because the grinding roller and the grinding disc lining board after long time operation is under severe wear caused by uneven surface between the disc and the extrusion roller, and roller is the head in 3000 hours of maintenance, the grinding ability decreased, so keep the thin layer, low volume, low pressure control. To reduce the vibration of the Ore Milling Equipment. At the same time, due to the wear and tear of the grinding parts, the main motor load is large, and the internal load of the Ore Milling Equipment is large. The motor current is obviously larger than the normal one, and the hydraulic pressure can not be increased. Otherwise, the load of the main motor will be heavier, and the operation will be unstable and the vibration will increase. As the output is low, a large amount of material can not be produced by the circulating fan. Although the front valve of the fan is smaller, the current of the circulating fan is larger. Because the material layer is thin, it is not easy to stabilize the material layer, and our company doesn't use the sprinkling device, so the grinding temperature can't control the height, so as not to make the material too loose and cause the Raw Ore Milling Equipment vibration.