The ball mill is a high-energy-consuming device in the beneficiation process. How to reduce the unit energy consumption directly affects the economic indicators of the beneficiation plant. We can, on the basis of the original, reform the ball mill and use rolling bearings instead of the original sliding bearings. It can relieve the bearing life under heavy load, axial turbulence of the cylinder, bearing sealing and other issues, and achieve the purpose of simple management and maintenance, and reduce fuel consumption and energy consumption.
The advantages of using a bearing alloy tile in a ball mill are: compliance, good inlay, saturation, and strong anti-gluing ability. However, it is difficult to manufacture and process, and it requires fine scraping. It takes time to replace the bearing, labor intensity is relatively large, and maintenance costs are relatively high. Lava is often caused by loose seals at the outlet. When the lubrication is not ideal, it is prone to wear and tear or tile burning. The on-site bad environment in the mining industry is rather poor. Dust and pulp may enter the main shaft. This is very unfavorable for rotating bearings. Therefore, seals are more important for rotary bearings than sliding bearings. The seal must not only prevent the lubricant from leaking, but also prevent the entry of harmful foreign substances and the entry of dust. Otherwise, it will cause serious wear of the bearing raceway, reduce the service life of the rotary bearing, and increase the extra load due to wear, eventually causing wear failure of the rotary bearing. .
Technical renovation program is as follows
Ball mill bearing type selection; ball mill bearing type should use double row radial spherical roller bearings. Because the load of the ball mill is relatively large, the bearing span is large at both ends, and the bending deformation of the ball mill barrel will produce different axes during operation. The radial spherical roller bearing has self-aligning performance, which can compensate the axial line of the cylinder caused by the deformation under the dynamic and static loads. It also has a relatively strong bearing capacity, and can reduce the size of the outer diameter. The choice of cooperation is due to the rotation of the inner ring of the ball mill roller bearing and the radial load in a fixed direction. Therefore, the inner ring is a cyclic load. The interference between the hollow shaft and the inner ring of the bearing must ensure that the pressure generated between the contact surfaces meets the bearing. The axial force and the frictional distance between the hollow journal and the inner ring of the bearing ensure that the two do not generate relative slip during rotation. However, the amount of interference must also ensure the normal operation of the bearing. If the amount of interference is too large, it will cause serious deformation of the bearing, or even scrapped. The outer ring of the rolling bearing does not rotate, and it bears a fixed radial load, so the outer ring is partially loaded. The clearance between the outer ring of the bearing and the bearing seat should be selected for clearance. The outer ring of the bearing can slide in the axial direction, and can also rotate around the axis. In order to compensate for axial expansion and contraction of the cylinder body, one end of the cylinder body is designed to be freely supported. In order to ensure the correct engagement of the gears, the hollow shaft of the discharge end is not allowed to move axially, and the telescopic clearance is set at the feed end. When the cylinder is heated and extended, the outer ring of the free end of the bearing can slide along the bearing seat, reducing the axial internal force of the cylinder and the end cap so as to adapt to the string movement after the cylinder is heated and extended.
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