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Committed to stable performance automatic bottle production line since 1990s

A manufacturer specializing in the production of PET blow molding machines and molds

by:Yosion Machinery     2021-06-29
Common faults and diagnosis methods of blow molding machine Fault 1: PET bottle transparency is absolutely not good Reasons: 1. Heating temperature is too high 2. Heating time is too long 3. Compressed air contains water 4. Injection moulding tube itself is absolutely opaque 5. Embryo Tube design is absolutely uncomfortable. 6. The expansion ratio is very small. Elimination methods: 1. Cool down 2. Reduce heating time 3. Use a dryer to remove water 4. Improve embryo tube quality, select materials and increase raw material dryness 5. Improve embryo tube size Design 6. Reduce the diameter of the embryo tube. Fault 2: The PET bottle appears pearly and white. Reasons: 1. The heating temperature is so low. 2. The wall thickness of the embryo tube is never uniform. 3. The thickness of the embryo tube is very thick. , Increase the temperature or slow down the revolution speed 2. Improve the quality of the embryo tube 3. Reduce the thickness of the embryo tube, or try to increase the outer cover of the heating device to increase the surface temperature of the embryo tube. Trouble 3: The position of the PET bottle bottom nozzle moves westward Reasons: 1. It was too early to start blowing 2. The stretch rod did not go down to the bottom 3. The center line of the stretch rod and the bottle axis shifted westward 4. The embryo tube wall thickness was never uniform or the injection density was never uniform 5. Heating is never uniform. Elimination methods: 1. Delay the blowing time or increase the descending speed of the stretch rod 2. Adjust the position of the magnetic pole switch 3. Adjust the position of the stretch rod 4. Improve the quality of the embryo tube 5. Improve the heating conditions, or Check whether there is any problem with the rotation of the embryo tube. Trouble 4: The wall thickness of the PET bottle is never the same. Reasons: 1. The position of the stretch rod is never in the center of the embryo tube. 2. The blowing holes are absolutely asymmetrical and the aperture is never the same. 3. The stretching ratio is so low Or the inflation ratio is very small. 4. The embryo tube never rotates in the heating furnace. 5. The wall thickness of the embryo tube or the injection density will never be eliminated. Methods: 1. Adjust the position of the stretch rod 2. Adjust the blowing Air hole position and hole diameter 3. Increase the stretching ratio or inflation ratio 4. Check the rotation device 5. Improve the quality of the embryo tube. Failure 5. The lower part of the bottle is very thick. Reasons: 1. The upper temperature is so low 2. The distance between the mold vent holes The lower part is far away 3. The stretching ratio is so low 4. The upper part of the bottle has a too low inflation ratio 5. The stretching rod speed is very slow. Elimination methods: 1. The upper part is heated 2. The position of the vent hole is adjusted 3. The stretching ratio is increased 4. . Change the shape of the bottle 5. Adjust the stretch rod speed. Fault 6: The bottle is very thin in the middle of the day. Reasons: 1. Start blowing earlier 2. The top temperature is too high 3. The top of the embryo tube is very thin. Troubleshooting: 1. Delay the start blowing time 2. Lower the top temperature 3. , Increasing the thickness of the top of the embryo tube. Fault 7: Obvious reasons for the bottle clamping line: 1. Insufficient mold clamping pressure 2. Early sealing time 3. Mold problem 4. The size of the embryo tube tooth mouth and the mold match will never match the troubleshooting method: 1. Increase the fit Mold pressure, adjust the mold clamping support rod angle (<5 degrees) 2. Then move the mold clamping stroke switch position 3. Repair the mold or check the mold assembly position, such as whether the guide post is loose or whether the mold has not been compressed 4 , Repair mold tooth mouth fitting fault 8: The top of the bottle or the bottleneck is rolled up, and the cause of the material accumulation: 1. The delayed blowing time is very long 2. One roll, one good 3. The temperature at the accumulation place is very low 4. The action uses air pressure It is absolutely unstable and affects the descending speed of the stretch rod. Elimination methods: 1. Shorten the delayed blowing time or reduce the descending speed of the stretch rod. 2. Reduce the air volume on the side of the reel. 3. Increase the heating temperature of the embryo tube. 4. Add a gas storage tank to the action air source, or shorten the gas supply pipeline failure 9: The bottom of the bottle is stretched and perforated. Reasons: 1. The temperature is not enough and has not penetrated 2. The delay stretch time is very long 3. The stretch is higher than too much. Big 4. The top of the embryo tube is very thin 5. The tip of the stretched rod is very sharp. Elimination methods: 1. Heat 2. Shorten the delay stretching time 3. Reduce the stretch higher than 4, Improve the design of the top of the embryo tube 5. Round the stretch Extending rod head failure 10: Causes of bottom blasting: 1. The delayed blowing time is very short 2. The delayed mold opening time is very short 3. The temperature is very high 4. The exhaust valve will never work. Troubleshooting: 1. Extend the delayed blowing Air time or increase the descending speed of the stretching rod 2. Lengthen the delay opening time 3. Cool down 4. Use gasoline to clean the exhaust valve. Fault 11: The bottom of the bottle is never full. Reasons: 1. The bottom temperature of the bottle is very high. 2. The mold bottle Insufficient or uneven vents at the bottom 3. The stretch rod has not reached the top 4. The design of the stretch rod head never conforms to the shape of the top of the embryo tube 5. The blowing pressure is insufficient 6. The blowing valve flow is insufficient 7. The bottle The bottom curve design is definitely not good. Elimination methods: 1. Reduce the temperature at the top of the heating zone or use a damp cloth to reduce the temperature at the top of the embryo tube 2. Increase the number of vent holes and make them evenly distributed 3. Adjust the stretch rod to the bottom of the bottle 4. Replace Stretch the rod head 5. Increase the blowing pressure. 6. Use gasoline to clean the blowing valve. 7. Increase the bottom curve and streamline design of the bottle blowing machine. Operating points 1. Before starting each shift, it is necessary to add lubricating oil to each movable part. (Manipulator, manipulator guide rail, opening and closing mold guide. 2. The swing arm can be added once a day (3-4), and the large chain and small chain of the heating machine can be added once a month. Always check whether the main reducer and the heating machine are reduced Lack of oil. The main engine bearing can be refilled once every 3 months.
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