The following are the daily maintenance points for 120mm hot-feed rubber extruders:

1. Equipment inspection:
- Before starting the machine every day, check whether the extruder barrel and process control temperature are within the process temperature range required for production. If there is any deviation, it needs to be adjusted appropriately.
- Check the quality of raw materials used for production and the amount of production materials in the extruder hopper when taking over, and check whether there are any debris.
- Patrol around the production equipment for a week to check the working conditions of each transmission part when the equipment is running, such as whether the rotation is smooth and normal, whether there are any abnormal sounds, and whether the temperature of the heating part is working normally.
- Check the voltage and current pointers of the main motor on the operation control box to ensure that the ammeter pointer is within the normal rated current index.
2. Cleaning and maintenance:
- Regularly clean the residual material in the extruder barrel to prevent the accumulation of materials from affecting the performance of the equipment and product quality. When cleaning, only bamboo or copper knives can be used to scrape the sticky material. Steel knives are not allowed to scrape the sticky material, and it is not allowed to remove the residual material on the screw by roasting with fire.
- Remove dust, oil and debris from the surface of the equipment in time, keep the appearance of the equipment clean and tidy, and avoid dirt accumulation that affects heat dissipation and normal operation of the equipment.
3. Lubrication maintenance:
- Check each lubrication part, such as bearings, gears, etc. at least 1-2 times per shift, add enough lubricating oil to ensure good lubrication. The temperature of the bearing part should not exceed 50℃ when working. If the temperature is too high, check the lubrication condition or whether there are other faults.
- Regularly replace the reduction gearbox lubricating oil. Generally, after 500 hours of use, there will be iron filings or other impurities in the reduction gearbox. At this time, the gears should be cleaned and the lubricating oil should be replaced.
4. Operation specifications:
- Before feeding production, the barrel and the molding mold must be heated and kept at a constant temperature for no less than the specified time. Feeding production is not allowed under conditions lower than the plasticizing temperature of the raw materials to prevent affecting product quality and damaging the equipment.
- The screw must be started at low speed, and the idling time shall not exceed 3 minutes. The screw speed is allowed to increase gradually only after running at low speed for a period of time to avoid the impact of instant high-speed start on the equipment.
- During work, the current changes of the main motor should be observed frequently. If the motor is found to be working under overload for a long time (momentary overload is allowed), the machine should be stopped immediately to find the cause of the fault and continue production after the fault is eliminated.
- When the extruder needs to be stopped for a long time, anti-rust grease should be applied to the working surfaces of the screw, barrel, and head. Small screws should be hung in the air or placed in a special wooden box and leveled with wooden blocks to prevent the screw from deformation or damage.
5. Safety matters:
- It is strictly forbidden to drop metal or other debris into the hopper to avoid damage to the screw and barrel. To prevent iron debris from entering the barrel, a magnetic component or magnetic frame can be installed at the material feeding port where the material enters the barrel. At the same time, it should be noted that the material must be screened in advance.
- If there is a power outage during production, the main drive and heating stop. When the power is restored, the barrel sections must be reheated to the specified temperature and kept warm for a period of time before the extruder can be started. The extruder must be manually turned first, and the motor must be started at a low speed after confirming that there is no abnormality.
- If abnormal sounds or other abnormal conditions occur during the operation of the extruder, the machine should be stopped immediately for inspection or repair. It is strictly forbidden to operate the equipment with defects.
6. Regular tightening:
- Regularly check whether the screws, bolts and other connectors of various parts of the equipment are loose, especially the key parts such as the fixing screws connecting the barrel and the machine base. If they are loose, they should be tightened in time. For example, after the barrel is heated and kept at a constant temperature for the first time, the fixing screws connecting the barrel and the machine base should be tightened again.
7. Parts maintenance:
- Regularly check the wear of the screw and barrel. For slight scratches or rough surfaces, use oilstone or fine sandpaper to grind them to make them smooth; if the wear is serious, they need to be repaired or replaced in time.
- Check the heating coil and temperature control system, repair or replace the damaged heating coil, adjust the position of the thermocouple, and ensure accurate temperature control.
- Check the wear of the transmission gears and rolling bearings. Gears with severe wear should be surveyed and mapped, and spare parts manufacturing and purchase plans should be proposed as needed, ready for replacement during the next maintenance.
- Check and calibrate the heating temperature of the barrel and the molding die (measured with a mercury thermometer) and the temperature displayed on the instrument on the control box to ensure the correct operation of the process temperature.
- Check whether the water, gas and oil pipelines are unobstructed, and clean and repair the leaking and blocked parts.
- Check and adjust the working position of the electric heating device, cooling fan and safety cover to ensure that they can work normally and effectively.