Fracture Reasons of Corrugated Pipe of thermoplast extrusion

　　The fracture of bellows is caused by fatigue failure due to excessive elongation or distortion in tension.

　　Reasons for excessive elongation or distortion of thermoplastic extrusion melt pumps include:

　　(1) Vigorous vibration is caused by misalignment of slurry pump and motor coupling, bending of pump shaft, damage of bearing, excessive axial movement, etc.

　　(2) eccentricity of dynamic and static rings;

　　(3) Resonance;

　　(4) Dry friction, due to poor lubrication, will cause excessive friction moment of sealing end surface, distortion of bellows, and cause dry friction or semi-dry friction because of serious evacuation, excessive compression and high end-to-face pressure ratio.