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    [notice] four major problems of extruder will be solved for you!

    release time:2020-03-04  viewed:772次
     Extruder is an important equipment for plastic molding and granulation. The normal use of extruder can give full play to the efficiency of the machine and keep a good working condition. It is necessary to maintain the machine and extend its service life.
    The main faults of extruder are abnormal noise and abnormal vibration caused by abnormal wear, wear or damage of transmission parts, poor lubrication, etc., as well as foreign matters stuck, link blocking, etc.
    In order to avoid the occurrence of faults, in addition to the daily maintenance, service and overhaul in strict accordance with the requirements, it is also necessary to know these:
    I. screw wear of extruder
    Cause of wear
    The normal wear of screw and barrel of Screw Extruder mainly occurs in feeding area and metering area. The main wear reason is dry friction between chip particles and metal surface. When the chip is heated and softened, the wear decreases.
    The abnormal wear of screw and barrel will occur when the screw ring knot and foreign matters are stuck. The ring knot means that the screw is locked by the condensed materials. If the screw extruder lacks good protection device, the strong driving force may break the screw, which will produce extraordinary huge resistance, causing serious damage to the screw surface and severe scratch of the barrel. It is difficult to repair the scratch of the barrel 。 The design principle of the barrel ensures that the service life of the barrel is longer than that of the screw. For the normal wear of the barrel, generally, it will not be 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.
    The solution of screw wear
    The local damage of screw thread was repaired by overlaying special anti-wear and anti-corrosion alloy. Generally, inert gas arc welding and plasma argon arc welding are used, and metal spraying technology can also be used for repair. First, grind the worn outer circle surface of the screw to a depth of about 1.5mm, then weld the alloy layer to a sufficient size to ensure sufficient machining allowance, and finally grind the outer circle of the screw and the side of the thread to the original size of the screw. Content from dedecms
    2、 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 and adjustment or poor engagement. It can be solved by changing bearings, improving lubrication, changing gears or adjusting gear engagement.
    This article comes from Zhimeng
    (2) If the noise is sharp scraping sound, the possibility of scraping between the shaft head and the drive shaft sleeve caused by the deflection of the barrel position shall be considered. It can be solved by adjusting the barrel. This article comes from Zhimeng
    (3) If the barrel makes noise, it may be that the screw is bent to sweep the chamber 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.
    3、 Abnormal vibration
    If this situation occurs at the reducer, it is caused by the wear of the bearing and gear, it can be solved by replacing the bearing or gear; if it occurs at the barrel, it is due to the mixing of hard foreign matters in the material, it is necessary to check the material cleaning, if necessary, install a strong magnetic device in the hopper to absorb iron chips.
    4、 Ring blocking material at screw inlet
    This kind of fault is mainly caused by cooling water cut-off or insufficient flow. It is necessary to check the cooling system and adjust the cooling water flow and pressure to the specified requirements. It is also possible that the large recycled material block in the raw material will block the feed port, and the feed port needs to be cleaned.

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