The fault analysis of the extruder

1.1 Abnormal noise of the extruder
(1) If it occurs in the reducer, it may be caused by bearing damage or poor lubrication, gear wear, improper installation and adjustment or poor meshing. It can be solved by replacing bearings, improving lubrication, replacing gears or adjusting gear meshing conditions.
(2) If the noise is a sharp scraping sound, the possibility of scraping between the shaft head and the transmission shaft sleeve due to the deviation of the barrel position shall be considered. It can be solved by adjusting the barrel.
(3) If the barrel makes noise, it may be that the screw is bent to sweep the bore or the set temperature is too low, resulting in excessive friction of solid particles. It can be treated by straightening the screw or increasing the set temperature.

1.2 abnormal vibration of the extruder
If this happens at the reducer and is caused by the wear of the bearing and gear, the bearing or gear can be replaced; If it occurs at the barrel, it is due to the mixing of hard foreign matters in the material, and it is necessary to check the cleanliness of the material.
Main causes and solutions of wear of screw extruder

2.1 main causes of wear of screw extruder
The normal wear of screw and barrel of Screw Extruder mainly occurs in feeding area and metering area. The main wear reason is caused by dry friction between chip particles and metal surface. When the chip is heated and softened, the wear decreases.
Abnormal wear of the screw and barrel will occur when the screw is looped and foreign matters are stuck. Looping refers to the locking of the screw by condensed materials. If the screw extruder is lack of good protection device, the strong driving force may twist the screw, and the jamming will produce unusually great resistance, resulting in serious damage to the screw surface and serious scratch on the barrel, The scratch on the barrel is difficult to repair. In principle, the design ensures that the service life of the barrel is longer than that of the screw. For the normal wear of the barrel, it is generally not repaired. The method of repairing the screw thread is often used to restore the radial clearance between the L in the barrel and the outer diameter of the screw.