Common faults and solutions of box type resistance annealing furnace

The box type resistance annealing furnace may encounter various common faults during use. Here are some common faults and their solutions:
1. Heating fault
①.Heating up too slowly or unable to reach the set temperature
reason:
The voltage of the power grid is too low.
The three-phase current imbalance value exceeds the specified range.
The electric heating element is open circuit or missing phase.
The resistance value of the electric heating element does not meet the requirements or the power decreases.
Too much material is loaded into the furnace, resulting in excessive heat load.
The performance of the insulation screen or furnace lining deteriorates, resulting in excessive heat dissipation.
The output voltage of the furnace transformer is low.
The output power of the power regulator is too low.
Temperature control device malfunction.
resolvent:
Check and adjust the voltage of the power grid.
Measure and adjust the resistance of the electric heating element to ensure three-phase balance.
Check and replace damaged electric heating elements.
Reduce the loading amount and lower the heat load.
Replace the insulation layer or improve the furnace lining structure to reduce heat dissipation.
Check and adjust the output voltage of the furnace transformer.
Check or adjust the output power of the power regulator.
Eliminate the malfunction of the temperature control device.
②. Do not heat up
reason:
Power supply failure, such as poor contact of sockets and control switches.
The ammeter does not display, it may be due to a broken circuit in the electric furnace wire.
The controller is not working, which may be due to internal switch, fuse or furnace door travel switch malfunction.
resolvent:
Check and adjust or replace sockets and control switches.
Use a multimeter to check for open circuit in the electric furnace wire and replace any damaged wires.
Inspect the internal switches, fuses, and furnace door travel switches of the controller to ensure its normal operation.
2. Temperature control malfunction
①. Excessive temperature fluctuations
reason:
The temperature sensor is damaged or loose.
The temperature control instrument is malfunctioning.
Poor sealing of the furnace door leads to heat dissipation.
resolvent:
Check and replace the damaged temperature sensor.
Repair or replace temperature control instruments.
Check and improve the sealing performance of the furnace door.
②. Inaccurate temperature display
reason:
The reference temperature of the thermocouple does not meet the requirements.
Leakage or deterioration of thermocouple electrodes.
The compensation wire does not match the thermocouple or its polarity is reversed.
resolvent:
Check and adjust the reference temperature of the thermocouple.
Check and replace thermocouple electrodes that are leaking or have deteriorated.
Replace the matching compensation wire and ensure correct polarity connection.
3. Other common faults
①. Poor sealing performance
reason:
The sealing ring of the furnace cover is aging.
There are gas leakage points in the furnace body.
Poor sealing of vacuum pipelines, valves, etc.
resolvent:
Replace the aging furnace cover sealing ring.
Check and repair the leakage points in the furnace body.
Check and improve the sealing performance of the vacuum system.
②. Trip fault
reason:
The switch is damaged.
The resistance furnace is leaking electricity, and the protective switch is functioning.
Current overload.
resolvent:
Replace the damaged switch.
Check and repair the leakage problem of the resistance furnace.
Adjust the current load to avoid overload.
4. Preventive measures
Regular inspection: Regularly inspect and maintain the resistance furnace, including the working status of electric heating elements, temperature sensors, temperature control instruments, and furnace door seals.
Standardized operation: Use the resistance furnace strictly in accordance with the operating procedures to avoid malfunctions caused by improper operation.
Maintain cleanliness: Regularly clean the residue and dust inside the furnace to ensure that there are no flammable or explosive materials around the equipment.
Strengthen training: Improve operators’ understanding of the structure, working principle, and common fault handling methods of resistance furnaces, ensuring their ability to handle abnormal situations.
By implementing the above measures, common faults in box type resistance annealing furnaces can be effectively prevented, and the efficiency and safety of equipment use can be improved.