All four problems of extruder are solved!
All four problems of extruder are solved!
Extruder is the important equipment of plastic molding and granulation and the normal use of extruder can give full play to the efficiency of the machine and maintain a good working condition. It is necessary to maintain diligently and prolong the life of the machine.
The main failure of the extruder is abnormal noise and abnormal vibration caused by normal wear and transmission parts, such as abrasion or damage of transmission parts, etc., and also the death of foreign body card and blocking material.
In order to avoid failure, we need to know these things in addition to strict daily maintenance, maintenance and maintenance.
1. The extrusion screw wear
The wear reason
Screw extruder screw and barrel of the normal wear mainly occurred in the loading area and measurement area, the main wear reason is sliced dry friction between particles and metal surface, when wear after the heat up to soften.
Screw and barrel is not normal wear and tear will be in the screw ring junction and foreign bodies stuck, splice refers to the material of screw is frozen lock, if the screw extruder lack of good protection device, a powerful driving force likely to twist off the screw, stuck will produce unusually large resistance, cause serious damage on the surface of the screw and barrel of the serious scratch, barrel scratch is difficult to repair. Barrel from the design principle, guarantee the service life is longer than the screw, the barrel of the normal wear and tear, generally no longer repair, often use the method of repairing screw thread, restore the barrel inner hole and the screw diameter with radial clearance.
Solution for screw wear
The local damage of screw thread is repaired by the method of surfacing. Inert gas shielded welding and plasma argon arc welding are generally used, and metal spraying technology can be used to repair. First will wear screw cylindrical surface grinding, depth of about 1.5 mm, then surfacing welding alloy layer to enough size, ensuring we'll have enough machining allowance, finally and the cylindrical grinding screw thread profile to the appearance of the screw size for the original size.
2. Abnormal noise
(1) if it occurs in a speed reducer, it may be caused by bearing damage or lubrication, or it may be caused by gear wear, improper installation or improper meshing. It can be solved by changing bearing, improving lubrication, changing gear or adjusting gear meshing condition.
(2) if the noise is a sharp scraping sound, it should consider the deflection of the cylinder position, resulting in the possibility of the shaft head and transmission shaft. Can be solved by adjusting cylinder.
(3) if the cylinder emits noise, it may be the bending of the screw or setting the temperature too low to cause excessive friction of the solid particles. It can be processed through the alignment screw or the setting temperature.
Iii. Abnormal vibration
If this happens at the reducer, it is caused by the wear of the bearing and the gear, which can be replaced by the replacement of the bearing or gear. If it occurs in the machine tube, it is because of the hard foreign material in the material. It is necessary to check the cleaning condition of the material and install the strong magnetic device in the hopper to absorb the iron filings when necessary.
4. Ring nodules at the entrance of the screw
This fault is mainly caused by the cooling water interruption or the lack of flow. It is necessary to check the cooling system and adjust the cooling water flow and pressure to the requirements. It is also possible that the raw material of the raw material is clogging the feeding mouth.
