The electric heating pipe in packaging machines is the core component of the equipment heating system. Its failure can lead to problems such as heat sealing failure and downtime losses. In view of abnormal scenarios of electric heating pipes, the following quick diagnosis and replacement solutions are provided in combination with industry experience to help factories reduce downtime and improve equipment stability.
1. Electric heating pipe failure diagnosis process
Basic inspection
Appearance inspection: Observe whether the surface of the electric heating pipe of the packaging machine is oxidized, deformed or broken, and whether the terminals at both ends are burned.
Resistance test: Use a multimeter to measure the resistance value of the electric heating pipe. If the deviation is greater than 10% (such as the nominal 20Ω measured greater than 22Ω), it is determined that the internal resistance wire is damaged.
Insulation test: Detect the insulation resistance between the outer shell and the wire of the electric heating pipe. If it is less than 1MΩ, it needs to be replaced to avoid the risk of leakage.
Circuit system troubleshooting
Check whether the power supply line of the packaging machine is loose and whether the voltage is stable (standard 220V±10%). Test whether the solid-state relay/contactor is normally attracted to avoid the electric heating tube from not working due to interruption of the control signal.
Load balance verification
The multi-stage heat sealing knife needs to ensure that the power of the electric heating tube in each heating zone is consistent (such as a single tube ≤800W) to prevent local overload from causing chain failures.
2. Electric heating tube replacement operation guide
Safe power off and disassembly
Turn off the power of the packaging machine and hang a warning sign, remove the fixing screws and power connection wires of the electric heating tube.
Clean the carbon deposits or residues in the installation groove to ensure that the contact surface of the new tube is flat.
New tube installation specifications
Select an electric heating tube that matches the original model (power ±5%, length ±2mm) to avoid poor heat dissipation due to size mismatch.
Evenly apply thermal conductive silicone grease (thickness 0.1-0.3mm) to improve heat transfer efficiency.
Function verification
After power on, test the heating speed of the electric heating tube (industry standard: 3-5 minutes to reach the set temperature) and observe whether the temperature control system is stable.
Adjust the sealing pressure to 2-3kg/cm² and test whether the sealing strength meets the standard (composite film ≥12N/15mm).
III. Preventive maintenance recommendations
Periodic inspection Measure the resistance value of the electric heating tube every month and record the trend. Replace it in advance when the deviation is >5%.
Clean the heat dissipation duct every quarter to prevent dust accumulation from overheating and burning the electric heating tube.
Environmental adaptability optimization
When the workshop humidity is >70%, increase the inspection frequency of the electric heating tube insulation layer to avoid moisture causing short circuit.
In high temperature environment (>35℃), shorten the continuous working time of the electric heating tube to ≤8 hours/day.
