At some cement factories, cement mill bearing is likely to be burned, which belongs to major accident. The main reasons for it are foreign materials entering into bearing or the poor lubrication system. In some cases, it can lead to damage to hollow shaft neck of bearing. Once burning occurred, it needs over ten hours or even a couple of days to repair. In order to solve cement mill bearing lubrication and management problems, people keep on researching sealing modes, installation technology and lubrication measures to guarantee bearing running in good condition. Here, we take 02.2mx6.5m cement mill as an example, talk about the oil lubrication of bearing.
Under the calling on energy saving and green industry, Hongxing Mining machinery is ready to create a good machinery environment avoid pollution. On the base of original ball mill bearing achievement, Hongxing has developed a new type energy saving bearing ball mill, which has stepped into batch production phase. Energy saving bearing ball mill is a kind of milling machine, and it mainly solves the old type ball mill problems of heavy and large power consumption. It is driven by bearing, and can realize intelligent power adjustment by PCI controlling circuit. This new machine adopts special manufacturing rolling bearing as barrel supporting structure.
At present, the static pressure bearing is widely used in large-scale energy-saving ball mills due to its property of high reliability, long service life, little energy consumption, great bearing capacity etc. No matter the ball mill is static or rotating, the entire fluid lubrication is realized through a thick layer of oil slick formed between the bearing bush and hollow shaft under the high-pressure oil outside. The lubrication state of the static pressure bearing has little to do with the oil slick pressure or rotating speed. When the mill starts to work, the space between the bearing bush and the hollow shaft remains a pure liquid friction and lubrication status, which is not easy to abrade the bearing bush. What’s more, the carrying capacity of the static pressure bearing is concerned with the oil pressure; therefore increasing the oil pressure can raise the supporting capacity of the oil slick.
Generally, cement plants often choose dynamic pressure lubricating method, which is major I will discuss in this article. At first, we should choose proper lubricating oil as well as additives, so that improve milling machine lubricating condition. The work features of cement mill bearing are large overload and linear velocity, suffering from impact and vibrating; the size of bearing bush and hollow shaft is also big, the improvement of shape, size, accuracy and smooth degree are effected by manufacturing conditions. Therefore, main bearings do not guarantee total liquid lubrication, but in boundary lubrication conditions. Excellent boundary lubrication (depending on the performance and strength of boundary film) can significantly reduce the coefficient of friction, reduce bearing wear.
The effect is very obvious when energy saving ball mill adopts rolling bearing. So, the requirement for rolling bearing manufacturing is rather strictly, as well as high technology degree. Therefore, as for most bearing types being easy to get, it is more economic to buy than repair. However, it is very important for ball mill bearing daily repair, the maintenance can prolong without doubt the bearing service life time.
To a large extend, cement mill malfunction is caused by no proper lubricating of main bearing. As cement machine develops to the direction of large scale and automatic, it is necessary to make out a thoughtful predictive maintenance plan.
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