Extruder Is The Plastic Processing And Granulation Of Important Equipment

  Extruder is the plastic processing and granulation of important equipment, the normal use of extruder, can give full play to the effectiveness of the machine, maintain a good working condition. Must be carefully maintained to extend the service life of the machine.

  The main fault of the extruder is abnormal noise and abnormal vibration caused by the wear or damage of the driving parts, the bad lubrication and so on, as well as the foreign body, the blocking material of the links and so on.

  In order to avoid failure, in addition to strictly according to the requirements of day-to-day maintenance, maintenance and overhaul, but also need to know these:

  First, extruder screw wear

  Wear reason

  The normal wear and tear of screw extruder and barrel are mainly occurred in the feeding area and the metering area, the main wear reason is the dry friction between the slice particle and the metal surface, and when the slice warms and softens, the wear decreases.

  The abnormal wear of screw and barrel will occur when the screw ring knot and foreign body card die, and the ring-knot refers to the frozen material holding dead, if the screw extruder lacks the good protection device, the formidable driving force may break the screw, the card death will produce the unusual huge resistance, causes the screw surface serious damage and the machine cylinder serious scratches, the machine cylinder scratches is difficult to repair. The barrel from the design principle to ensure that the service life is longer than the screw rod, for the normal wear of the barrel, generally no longer repaired, often with the method of repairing screw thread, to restore the internal hole of the barrel and the radial clearance of the outer diameter of the screw rod.

  The solution of screw wear

  The local damage of screw thread is repaired by the method of surfacing special anti-wear and corrosion resistant alloy. Inert gas protection welding and plasma Argon arc welding are generally used, and metal spraying technology can be used to repair. First, the worn screw cylindrical surface grinding, the depth of about 1.5mm, then the surfacing alloy layer to sufficient size, to ensure sufficient processing allowance, the final grinding screw external circle and thread side to screw the shape of the original size.

  II. Abnormal noise

  (1) If occurs in the reducer, may be caused by the bearing damage or poor lubrication, may also be the gear wear, improper installation adjustment or poor meshing. It can be solved by replacing bearing, improving lubrication, changing gears or adjusting gear meshing condition.

  (2) If the noise is sharp, it should consider the deviation of the barrel position, which causes the possibility of the shaft head and the drive shaft to scrape. can be resolved by adjusting the cylinder.

  (3) If the barrel emits noise, it may be that the screw is curved or the setting temperature is too low to cause the excessive friction of the solid particles. It can be treated by straightening screw or by raising the setting temperature.

  III. Abnormal Vibration

  If this happens at the reducer, is due to the wear of bearings and gears caused by the replacement of bearings or gears can be resolved; if occurred in the barrel, it is due to the material mixed with hard foreign bodies, the need to check the material cleaning situation, when necessary in the hopper installed strong magnetic device, used to absorb iron filings.

  Four, screw the entrance of the ring blocking material

  This kind of fault is mainly due to cooling water or insufficient flow, need to check the cooling system, adjust the cooling water flow and pressure to the required requirements. It is also possible that the bulk of the material in the recycled material block into the feed mouth, the need to clean the feed.