Extruder failure analysis

The extruder is a common plastic machinery equipment. During the daily operation of the extruder, various faults may occur in the extruder, which affects the normal production of the plastic machinery. Below we will analyze the faults of the extruder.
Common faults and solutions of rod extruders
1.1. Abnormal noise
(1) If it occurs in the reducer, it may be caused by bearing damage or poor lubrication, or it may be caused by gear wear, improper installation 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, consideration should be given to the possibility that the barrel position is deflected, causing scraping of the shaft head and transmission sleeve. This can be solved by adjusting the barrel.
(3) If the barrel makes noise, it may be that the screw is bent or the set temperature is too low, causing excessive friction of solid particles. It can be handled by straightening the screw or increasing the set temperature.
1.2 Abnormal vibration
If this happens at the reducer, it is caused by the wear of the bearings and gears, which can be solved by replacing the bearings or gears; if it happens at the barrel, it is due to hard foreign matter mixed in the material, and the cleanliness of the material needs to be checked.
The main causes and solutions of screw extruder wear
2.1 Main causes of screw extruder wear
The normal wear of the screw and barrel of the screw extruder mainly occurs in the feeding area and metering area. The main cause of wear is the dry friction between the sliced particles and the metal surface. The wear decreases when the slices heat up and soften.
Abnormal wear of the screw and barrel will occur when the screw is knotted and foreign matter is stuck. Ring knot means that the screw is locked by the condensed material. If the screw extruder lacks a good protection device, the strong driving force may cause it to break. If the screw gets stuck, it will produce unusually huge resistance, causing serious damage to the surface of the screw and serious scratches to the barrel. Scratches to the barrel are difficult to repair. The design principle of the barrel ensures that the service life is longer than that of the screw. Normal wear and tear of the barrel is generally not repaired. The method of repairing the screw thread is often used to restore the radial clearance between the inner hole of the barrel and the outer diameter of the screw.