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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