Tracking gear Mesh Frequency - gearbox Cement plant

Equipment, plant overview, Context

The Cement Plant is operating 24 Hours 7 days a week, established for in the Middle East operating classical machinery. The Equipment
analyzed is a large crusher. The Wi-care sensors (8) where installed on the motor, the intermediate shaft and the gearbox in both axial and radial direction. Customer wants to perform a routine inspection previous a planned shutdown in the preventive maintenance program. Due
to travel expenses and delay for paperwork accessing the site, I-Care suggest the installation of Wi-care wireless vibration/temperature monitoring.

Analyst diagnosis and spectrum justification: Gear Mesh Frequency

We detect a gear mesh frequency of the output pinion with the grith gear (22Xoutput speed of the gearbox, 56.3 Hz). The amplitudes measured on the motor (Sensor 6000) are higher than those measured on the pinion (Sensor 6300). In fact amplitudes are amplified by resonance. We recommend following amplitudes.

On trends (sensor 6000) amplitudes have decrease over last week. Amplitudes measured in axial are higher due to misalignment of the pinion with the grith gear. We always detect amplitudes modulations from a non-uniform meshing caused probably by a slightly oval shape of grith gear or wear problem on tooth.

We detect a frequency (16.6 Hz) which corresponds on motor rotation frequency. No action required. Balancing OK. Motor Alignment OK. We do not detect any bearing defect           


Wi-care case study gearbox -2





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Nicolas Bleret, I-care, Belgique
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