Abnormal noise and vibration of the melt pump, core causes and countermeasures are as follows:
Main causes:
1. Cavitation (most common): Insufficient feed at the inlet or air suction can produce a "popping" sound and pressure fluctuations.
2. Bearing/gear wear: Leads to continuous abnormal noise and regular vibrations.
3. Misalignment/looseness: Misaligned couplings or loose base bolts can cause vibration of the entire machine.
4. Foreign object intrusion: Hard particles getting into the gears can trigger sudden impact noises.
Solutions:
1. Check the inlet immediately: Ensure sufficient feed and clear filters to eliminate air cavitation.
2. Shut down for inspection: Check and realign the couplings, and tighten all bolts.
3. Professional maintenance: If the above steps are ineffective, disassemble the pump to inspect bearings, gear wear, and any internal foreign objects, and promptly replace damaged components.
Core principle: First check external factors (feed, alignment), then inspect internal issues (wear, foreign objects).