The Hazards of Bearing Overheating in Disc Granulators

Bearing overheating is a common operational fault in disc granulators. If not addressed promptly, a minor anomaly can gradually escalate into a serious accident, directly compromising production efficiency and equipment service life. When bearings are subjected to prolonged high temperatures, the lubricating grease melts rapidly, drains away, or even carbonizes, thereby losing its essential lubrication and friction-reducing properties. This leads to dry friction between the rolling elements and raceways, accelerating wear and causing pitting or scorching; in severe cases, the bearing may seize completely, resulting in the sudden shutdown of the main machine.

High temperatures cause thermal expansion in the bearing's inner and outer rings as well as the main shaft, altering the critical fit clearances. Mild consequences include increased equipment vibration, abnormal operating noises, and general instability of the machine body; severe consequences involve the bending or deformation of the main shaft and a loss of coaxial alignment, thereby compromising the structural precision of the entire unit. Concurrently, a sudden surge in bearing resistance places a significantly heavier load on the motor and reducer. This can lead to unstable current flow, belt slippage and burnout, accelerated wear of reducer gears, and even the burning out of motor coils—triggering a cascade of interconnected failures.

Equipment instability also directly impairs the granulation process, manifesting as issues such as uneven granule size, low pelletizing rates, and discontinuous discharge, ultimately degrading the quality of the finished product. Furthermore, faults triggered by bearing overheating often necessitate a major overhaul involving machine disassembly—specifically to replace bearings, realign the main shaft, and repair transmission components. This not only drives up maintenance costs but also forces a shutdown of the production line, causing significant delays in production schedules.

Therefore, bearing overheating must not be overlooked. Routine daily inspections—covering lubrication, sealing, clearances, and operating temperatures—are essential. By promptly identifying and addressing any anomalies, operators can ensure the stable, safe, and long-term operation of the disc granulation production line.