Cause Analysis of Melt Pump Failure

The melt pump head is mainly composed of pump shell, drive gear, driven gear, sliding bearing, front and rear end plates, gravel seal, etc. The melt pump uses melt self-lubrication, and lubrication groove holes are arranged on the cleaning bearing. It works under high temperature and pressure and has good wear resistance.

melt Pump head stuck by foreign body

Pump head stuck by foreign bodies is a frequent failure, metal foreign bodies and even damage the gear. In one factory, a scraper rod of the first-line final shrinkage kettle was dropped and the head of the pump was jammed. The second-line melt pump was jammed by the metal parts falling from the final shrinkage kettle, and the tooth of the driving gear was broken. In many accidents of blocking of melt pump, the main causes are bolts, scrapers, scrapers, orifice plates, ribs and fixed seats which fall off from the final shrinkage kettle.

Vibration of melt Pump Head

Our company has had an accident of shutdown and maintenance due to the intense vibration of the melt pump. At that time, the pump head had irregular and violent vibration. At the same time, the melt pump outlet pressure was also observed to fluctuate greatly, sometimes every few days, sometimes several times a day. No problem with melt pump was found during shutdown maintenance.