The jet type heat shrink packaging machine is widely used in the packaging process of industries such as food, daily chemical, and medicine due to its efficient and stable shrinkage effect. However, the wear and tear of equipment caused by complex working conditions such as high-temperature jet and mechanical transmission cannot be ignored. Scientific maintenance and upkeep can not only reduce failure rates and repair costs, but also significantly improve packaging quality. The following provides a systematic analysis of the operation and maintenance points of jet heat shrink packaging machines from two dimensions: daily maintenance and common troubleshooting.
1、 Daily maintenance: Details determine equipment stability
1. Cleaning and Decontamination
Jet system: Clean the residual plastic debris or glue at the jet nozzle after daily shutdown to avoid blockage and uneven airflow. Compressed air can be used for blowing, and sharp tools for scraping are prohibited.
Conveyor belt: Wipe the surface of the conveyor belt with a soft cloth to prevent contamination of the packaging or slipping.
Heating chamber: Regularly remove plastic residues attached to the surface of the heating tube (it is recommended to use specialized cleaning agents), otherwise it may cause local overheating or fire risks.
2. Key component inspection
Heating tube and temperature control system: Before starting up, confirm that the heating tube is not broken or deformed, and that the temperature displayed by the thermostat has an error of ≤ 5 ℃ compared to the actual temperature.
Transmission chain/belt: Observe the tightness, and it is recommended that the sagging amplitude should not exceed 5mm when pressed by fingers. If it is too loose, it is easy to slip, and if it is too tight, it accelerates wear.
Jet valve: Check if the air pressure is stable (usually maintained at 0.3-0.5MPa) and if the valve is sensitive when opening and closing.
3. Lubrication management
Add high-temperature lubricating grease (such as molybdenum disulfide) to moving parts such as gears and bearings every week to avoid dry friction;
Attention: The bearings of the conveyor belt motor need to use high-temperature resistant lubricants, as ordinary butter may fail due to melting at high temperatures.
2、 Common fault diagnosis and quick handling
1. Wrinkled or damaged shrink film
Possible reasons: high/low temperature, uneven jet pressure, and mismatched conveyor belt speed.
Countermeasure: Reset the temperature control parameters (recommended segmented heating), adjust the air pressure to a uniform state, calibrate the conveyor belt and synchronize it with the jet timing.
2. Abnormal noise during equipment operation
Possible reasons: lack of oil in transmission components, damaged bearings, and misaligned chains.
Countermeasure: Immediately stop the machine for lubrication, check if the bearings are stuck, reset the chain, and tighten the tensioning device.
3. Heating tube not working
Possible reasons: blown fuse, temperature controller malfunction, heating tube open circuit.
Troubleshooting steps: Use a multimeter to check the circuit for continuity → Replace the fuse → Test the temperature controller signal output → Measure the resistance value of the heating tube.