Outer race of a disassembled girth gear
The outer race with the damaged tooth visible at the bottom of the image.

Gear damage in low-RPM pinion drive detected with Airius wireless sensors

Prominent non-ferrous metals company Aurubis Bulgaria AD utilized Airius wireless vibration sensors to detect damage in a ball mill's pinion drive gear.

Measurements on the slow-rotating pinion drive gear, operating at 187 RPM, showed a significant increase in vibration velocity from 5.5 mm/s to 21.5 mm/s between April and October 2020. The Airius sensors, measuring three-axial vibration, temperature, and enveloping, revealed dominating gear mesh frequencies, indicative of gear damage. Additional enveloping technique readings identified increasing bearing noise, aligning with the Ball Pass Frequency Inner Race (BPFI) symptom.

Despite the observed deterioration, careful monitoring allowed the ball mill to operate until its planned November 2020 maintenance, during which a broken tooth on the girth gear was discovered. This case highlights the importance of predictive monitoring in industrial maintenance for timely interventions and preventing critical failures.

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Case Study
Filename/description Language Size Modified
CS_039B_Girth_gear_Aurubis_BG.pdf English (United Kingdom) 14 MB 10/3/2023
Case study involving girth gear damage on a ball mill, detected with Airius sensors.

Airius wireless vibration sensors

Optimal for remote condition monitoring of standard production equipment, remote or inaccessible machines, the wireless Airius sensors perform time-based vibration and temperature measurements – keeping a watchful eye on your machinery.

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