The PET preform injection molding machine is one of the commonly used equipment in the plastic processing industry. It usually works for a long time. Therefore, how to ensure that the injection molding machine works normally and stably in continuous production is a problem that deserves attention and efforts to solve for both the injection molding machine manufacturers and users. From the user's perspective, under the premise of correctly selecting the injection molding machine model, regular preventive maintenance is an effective way to ensure the normal operation of the injection molding machine.
To keep your PET preform injection molding machine running smoothly, here are some maintenance recommendations:
The hydraulic oil used in the hydraulic system will gradually age due to high temperature, oxidation and pollutants during long-term use, producing colloids, sediments and acidic substances, etc., which will cause hydraulic system pollution.
Regularly check and clean the hydraulic system: Regularly check the filter element, filter screen and seals of the hydraulic system, and clean or replace the parts that need to be replaced. Keep the hydraulic system clean and prevent dust and impurities from entering the system.
There are usually more dust, particles and impurities in the injection molding workshop, which may enter the hydraulic system through air or other channels, causing system pollution.
Install suitable filters and filtering equipment, and regularly check and clean the filters to remove particles and impurities in the hydraulic system. Determine the selection and replacement cycle of the filter according to the use of the PET preform injection molding machine.
Keep the inside of the control box clean to prevent dust and debris from entering the control system and affecting the normal operation of electrical components. Clean the control box and the surrounding environment regularly, use compressed air or a soft brush to remove dust accumulation, and ensure that the circuit board and connector surfaces are clean.
Check the connections of electrical components regularly to ensure that all cables and terminals are securely fastened and not loose or oxidized. Pay special attention to high current transmission parts, such as heating elements and motor connectors, to ensure that the connections are firm to avoid failures caused by high temperatures due to looseness.
Ensure that the heat dissipation and ventilation system of the vertical injection molding machine control box is operating normally. Keep the vents unobstructed and ensure air circulation to prevent electrical components from being damaged by overheating. Check the working status of the cooling fan and heat sink regularly, and clean or replace them in time.
Regular calibration and testing of electrical control systems is an important step to ensure the stability of the equipment. Check the accuracy and stability of sensors, switches and controllers to ensure that they work within the normal range.
During maintenance and servicing, pay attention to the safe operation of the vertical injection molding machine. When repairing electrical components, be sure to cut off the power first and follow the relevant safety operating procedures to avoid injuries caused by electric shock or other safety hazards.
During the use of the injection molding machine, it is necessary to regularly observe whether the lubrication points of the injection molding machine are in normal working condition. Note that the time for each lubrication must be sufficient to ensure that each lubrication point of the entire lubrication system is well lubricated. The lubrication modulus (interval time) of the machine and the time for each lubrication are achieved through the reasonable setting of computer parameters.
Regularly observe the working condition of the lubrication system and keep the lubricating oil in the oil tank at a reasonable oil level. If poor lubrication is found, lubricate in time and check the lubrication condition of each lubrication point to ensure good lubrication of the machine.
Weekly maintenance inspection items for PET injection molding machines
1. Check and tighten all connecting bolts, such as elbow connections and fastening bolts of moving parts, mold fastening and connecting bolts or screws of movable parts in its structure, limit switch fixing locking screws, etc.;
2. Check the cooling pipelines and oil circuits of each system in the cooling device of hydraulic oil and lubricating oil to check for oil and water leakage, and tighten or replace the sealing gasket appropriately if necessary;
3. Carefully check the changes in grease in each lubrication point and oil pipeline, whether there is water mixed in the oil, whether there is metal powder or other debris mixed in the oil, and replace the lubricating oil or filter it if necessary.
1. Check the quality of hydraulic oil. If the oil contains impurities, insufficient oil or water, it should be handled in time and the insufficient hydraulic oil should be added;
2. Check whether the circuits of each point device are loose;
3. Check the ventilation filter on the electric control box, remove dirt, and remove and clean it if necessary;
4. Clean the hydraulic oil filter;
5. Clean each active surface (such as the pull rod, injection seat sliding guide surface, etc.), and then re-apply new lubricating oil.
1. Check the quality of hydraulic oil. Generally, the hydraulic oil of the injection molding machine is required to be replaced with new oil every 12-18 months. When the new equipment is used, the hydraulic oil should be discharged from the hydraulic system of the injection molding machine after 3 months of use. Clean the control valves, pipelines, and oil tanks in the hydraulic system (because the new equipment is initially used, the worn iron powder and unclean debris in the pipeline are mixed into the oil), filter the hydraulic oil (with a 150-mesh filter), and re-add it to the oil tank;
2. Correct the temperature difference error between the thermocouple temperature measuring instrument display and the temperature point measured by the thermometer, clean Remove dirt from the contact points of the thermocouple and calibrate the correct working temperature measurement position of the thermocouple;
3. Check the firmness of all wire connection points in the control box, check whether the rubber insulation layer of the line is aging, prevent leakage, and replace the line wires if necessary;
4. Check the mechanical transmission reduction system, such as the cleaning of the bearings, check the wear condition, and replace the bearings if necessary;
5. Check the wear condition of the gear tooth surface and the quality of the lubricating oil in the reduction box, and keep records;
6. Check the wear condition of the screw and barrel, repair the slight wear and scratches, and repair the serious wear and tear, keep records, and propose a replacement plan.
7. Each drive motor, hydraulic pump, and motor should be disassembled and inspected, check the wear condition of the bearings, pump body, etc., add lubricating oil (grease) after cleaning, keep records of the worn parts, and propose a repair or replacement plan;
8. Check some sealing rings and wearing parts, and replace them if necessary.
Regular maintenance of your PET preform molding machine can save you more time and money. With the above machinery maintenance tips, you can greatly extend the life of your preform injection molding machine and its operation and improve your return on investment. If you still want to consult or understand related issues, you can send an email to contact our engineer team. We will guide you for free!
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