Structure characteristics and working condition analysis of ball mill bearing

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Structure characteristics and working condition analysis of ball mill bearing

Ball mill Generally, it is composed of feeding part, rotating part, discharging part, transmission part and bearing part. The bearing part, as the main bearing part, carries most of the load of the ball mill. Its stable operation plays an important role in the ball mill. Once the bearing fault occurs, it will directly affect the normal work of the ball mill, seriously affect the production efficiency, and cause huge economic losses to the enterprise.

 Ball mill bearing

Structural characteristics of bearing

At present, most of the ball mills adopt the static bearing with larger bearing capacity, which is mainly composed of bearing bush, waist drum bearing liner and bearing seat. The hydrostatic oil film produced can avoid direct contact between bearing bush and hollow shaft, and to a large extent avoid Bush burning. Hydrostatic oil film is produced by a specific oil supply system with constant flow or constant pressure of pressure oil. There are oil passages and oil chambers in the bearing bush. Since the oil inlet is located at the center of the lower surface of the bearing bush, the lower surface of the bearing bush is in contact with the upper surface of the bearing liner, so it is necessary to drill an oil pipe groove on the upper surface of the bearing liner to distribute the oil pipe providing pressure oil. Due to the influence of the deformation of the bearing body on the bearing capacity.

There are two kinds of bearing liner structures: one is to cut a coiled tubing groove on the upper part of the bearing liner, which is called the continuous groove bearing liner; the other is to cut the oil pipe groove only at the place where the oil pipe passes through, and the center of the upper surface of the bearing liner is still a solid body, which is called the discontinuous groove bearing liner. This paper analyzes the two kinds of bearing liners and compares their stress and deformation under severe working conditions, so as to obtain a more reasonable structural design.

 Ball mill

Working condition analysis

During the stable operation of the ball mill, the static bearing can produce a constant thickness of hydrostatic oil film, which can avoid the direct contact between the rotary hollow shaft and the bearing bush of the ball mill. However, in the process of ball mill start work stop, it is inevitable that there will be instantaneous overload, oil supply system failure and power failure, which will cause the oil film to break or even disappear. In this case, the hollow shaft and bearing bush will directly contact, so that the bearing part will bear greater pressure. Therefore, the full load static condition under the condition of direct contact between hollow shaft and bearing bush is selected as the typical case Two kinds of bearing liners are analyzed.

The results show that the contact stress of the bearing liner in the two cases is basically the same, except for the contact area between the upper surface of the bearing liner and the lower surface of the bearing bush, the contact stress of the discontinuous groove bearing liner is greater than that of the continuous groove bearing liner, on the whole, the contact stress of the discontinuous groove bearing liner is relatively less than that of the continuous groove bearing liner; in both cases, the contact stress of the saddle seat and the bearing bush is relatively small The stress of the discontinuous groove bearing liner is far less than that of the continuous groove bearing liner on the corresponding bearing liner, and the stress concentration is obvious at the oil pipe groove of the continuous groove bearing liner.

The automatic self-aligning function of bearing liner makes the center of its upper surface bear greater stress. The discontinuous groove bearing liner can bear a certain load at the center of the upper surface because of its continuous body, so it contacts with the bearing bush, so the contact stress is large; while the continuous groove bearing liner transfers the load to other places, resulting in stress concentration at the edge of oil pipe groove.

Because the bearing liner plays an important role in the bearing load of ball mill, in order to prolong the service life of bearing liner and reduce the cost of occurrence and maintenance, it is suggested to select the intermittent groove bearing liner from the perspective of reducing stress and strain.

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