Case Study | Early Warning of Vibration Anomalies: Real-World Closed-Loop Resolution of Misalignment Risks in Raw Meal Mill Plate‑Chain Elevators

The plate-chain elevator is the core equipment for material conveying in cement raw‑mill systems. If the coaxial alignment between the motor and the reducer deviates, it will cause continuous wear on the coupling and bearings; in severe cases, this can lead to sudden shutdowns, disrupting the operation of the entire production line.

Recently, Zhongyun Technology’s intelligent operations and maintenance platform has proactively detected abnormal equipment vibrations, accurately diagnosed misalignment faults in drive systems, and guided enterprises in carrying out scheduled maintenance. By establishing a closed-loop workflow spanning early warning, diagnosis, repair, and verification, the platform provides a benchmark for preventive maintenance of equipment in the building materials industry.

1. The platform generates automated alerts, precisely identifying abnormal measurement points.

On July 9, 2026, the platform detected that the vertical vibration velocity at the drive end of the raw‑material mill plate‑chain elevator motor exceeded the set threshold, triggering an alarm. The platform automatically dispatched the alert to the operations and maintenance team, clearly indicating the alarmed equipment, the location of the measurement point, and the time of the alarm, thereby providing the team with a well-defined troubleshooting direction.

II. Spectrum-based professional analysis to identify equipment misalignment faults.

Upon receiving the alarm, the Zhongyun diagnostics team conducted an in-depth analysis, taking into account the equipment’s rated speed and structural parameters. The spectrum revealed dominant spectral components at twice the rotational frequency, a hallmark of misalignment faults. Based on this assessment, it was determined that a misalignment exists between the motor and the gearbox; it is recommended to schedule a shutdown soon to inspect the coupling condition.

III. On-site inspection after shutdown reveals severe wear on the coupling pin.

On that day, the equipment was shut down for inspection in accordance with the platform’s recommendations. Upon on-site verification, it was confirmed that the equipment exhibited misalignment. Following removal of the coupling’s nylon pin, the maintenance team performed alignment adjustments.

IV. Post-maintenance data verification: Vibration has significantly decreased, and operation is stable.

Following alignment of the coupling, the equipment was recommissioned. Platform monitoring data show that the vibration velocity at the motor’s drive end decreased significantly from 6.9 mm/s prior to the replacement to approximately 2.7 mm/s, with stable operation restored and the potential hazard completely eliminated.

V. Case Review: The Three Core Values of the Intelligent O&M Platform

The successful early warning and planned maintenance for the misalignment fault of this plate-chain elevator fully demonstrate the three core values of the intelligent operations and maintenance platform:

1. Early warning, enabling confident response: By issuing an alert before misalignment causes severe damage to the coupling, companies are given ample time to schedule maintenance and avoid unexpected shutdowns.
2. Precise diagnosis and targeted solutions: By leveraging spectral characteristics, misalignment faults can be accurately identified, enabling on-site root-cause analysis and preventing unnecessary disassembly and inspection.
3. Rapid closed-loop management ensures continuity: From early warning and diagnosis to maintenance and verification, the entire process is completed within the same day, guaranteeing stable production operations.

In the cement and building materials industries, heavy-duty conveying equipment operates under high loads for extended periods, and latent faults such as misalignment of drive components and bearing wear are difficult to detect early through manual inspections.

Zhongyun Technology specializes in industrial intelligent operations and maintenance, leveraging 24/7 online vibration and temperature monitoring combined with expert spectral diagnostics to provide round-the-clock remote protection for critical equipment such as mills, grinders, and fans. By harnessing data-driven predictive maintenance, the company helps factories reduce equipment failures, lower maintenance costs, and ensure stable production.

Do the hoists and bucket elevators at your plant frequently experience excessive vibration or coupling wear? Feel free to leave a comment in the discussion section to share your operational and maintenance expertise!