VIBRATION DIAGNOSTICS OF ELECTROMECHANICAL COMPLEXES OVER 40 KW

Abstract

Measurements were carried out at different points of the machine and workshop using the vibrometer “Vibran 2.2”. At the step of studying vibration spectrograms it was found that shock loads significantly prevail over vibration, and the main harmonic of vibration is characterized by a frequency of 7…8 Hz corresponds to the rotation frequency of the middle shafts of the machine. Theoretical methods have established the cause of the progressive vibration generated by the rotation of the massive shafts of the paper-making machine caused, on the one hand, by the bearings wear accompanied by deformation of the rings and mutual displacement of their axes of rotation and, on the other hand, by an increase in the radii of the eccentricity of the shafts, leading to increase in dynamic loads acting on the bearing units. The authors of the article, who are directly involved in the vibration diagnostics of the machine came to the conclusion that in order to reduce its vibration it is enough to replace bearings with new ones which due to prolonged operation (more than 25 years) and the influence of vibration and shock loads have long worked out their service life.