Classification and principle of vibration of bearings for woodworking band sawing machine

Bearing is one of the accessories often used in mechanical equipment, we will also use bearings in the design of woodworking band saw machine, it is also an important condition to ensure the normal work of woodworking band saw machine, bearing should be fixed in the work, and should not be back and forth vibration, some equipment service life is too long or inappropriate use of how to become bearing vibration, Today we will give you a detailed introduction to the classification and principle of bearing vibration.

The vibration of plain bearings can be divided into two forms according to its mechanism: One is forced vibration, also known as synchronous vibration, mainly caused by the unbalance of components on the shafting, the misalignment of the coupling, poor installation and other reasons, the frequency of vibration is the rotation frequency of the rotor and its frequency doubling, the amplitude of vibration before the critical speed of the rotor, with the increase of speed, over the critical speed, it decreases with the increase of speed. There is a resonance peak at the critical speed. Another kind of vibration is self-excited vibration, also known as sub-synchronous vibration, that is, oil film vortex and oil film oscillation, its vibration frequency is lower than the rotation frequency of the rotor (about half), often occurs suddenly at a certain speed, with great harm.

The principle of vibration diagnosis of plain bearings: in the design, manufacture and installation of plain bearings, the problems of reducing forced vibration, avoiding resonance and strengthening the dynamic stability of oil film have generally been considered. Therefore, under normal working conditions, the vibration level of lubricated bearings is limited to a lower level. If the vibration of the bearing exceeds this level, it will indicate that it has produced some kind of failure, in addition, vibration as a response to bearing excitation, according to the principle of frequency retention characteristics of the linear system, from its frequency component analysis, it is possible to find traces of various vibration sources.