About the bearing in the application of the various problems

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Transmission machinery bearings are indispensable parts of general use. Wrong choice, poor installation, improper use, maintenance is not timely will affect their life, causing equip ment failure, resulting in significant economic losses.

Bearing normal life called "narrow life." Bearing operation bearing inner and outer raceway and roller rolling surface, due to repeated load, material fatigue pitting.

Paper Machinery loss most bearings: dryer bearings, drive gear bearing, press roll, drive roll and other large roller type bearings.

First, the dryer

Such as: the operating side using 3,113,740 bearings, drive side bearing using 3,113,748. Bearing with the bearing outer ring is designed to transition fit, the inner adapter using shifting sets. In actual use, most bearing temperature is high, some up to 100 ℃ or more, or even burning phenomenon, and forced downtime.contact ball bearing

Second, the bearings used in the process several situations

1, the installation of the bearing preload does not meet the requirements, the inner ring and shaft relative rotation, causing severe wear of the journal; sometimes too large an adapter, the bearing during operation, due to thermal expansion is not enough space, leading to bearing inner ring burst.

2, bearing and bearing outer rings with improper tightening is too large, because the two different materials, different coefficient of expansion, bearing multi-cast iron or cast steel, the bearing, the outer ring of carbon chromium steel, in a certain temperatures, the transition fit into a tight fit when the interference exceeds a certain range, it will cause the outer ring burst; while the gap is too large, the bearing outer ring and bearing relative rotation, causing the bearing housing is worn, causing severe roller vibration, resulting in broken paper or paper cited difficulties.

3, the analysis, the load, high speed devices, such as bearing and shaft insufficient interference (preload not meet the requ irements), then the load bearing inner ring rotates, the inner circumference of the bearing generated between sliding direction of the creep phenomenon, so that the degree of wear increases with the surface, the shaft and the casing is damaged. Meanwhile, the invasion of the powder worn the bearing, causing the bearing to heat and vibration. Due to bearing friction heat generated by the rotation, the shaft and bearing chamber circulated out. Bearing chamber thermal conditions better than the shaft, so that the bearing outer ring than the inner ring, the rolling element low temperature 5-10 ℃. Moreover, since the hollow shaft through the steam dryer, the heat from the shaft to the bearing, and in the production operation, the bearing inner and outer temperature difference is even greater.high speed bearing

Third, bearing installation does not regulate the operation of the common

For bearing installation, many operators use "red cap" (barbecue heated) violations approach is very wrong. Broiled only difficult to control the temperature, the more important it is easy to change the bearing material resulting in "injuries", local heating and the bearing inner ring, the stress concentration easily deformed or even burst, shorten life. Recommended cooking oil or electric heating method installed bearings.