Common faults and solutions of box type atmosphere annealing furnace

Box type atmosphere annealing furnaces are widely used in the metal industry, and their common faults and solutions are as follows:

Temperature control issues
Excessive temperature fluctuations
Reason: Sensor aging and decreased accuracy result in inaccurate temperature detection inside the furnace, providing incorrect temperature information to the control system, causing the heating or cooling device to malfunction; The performance of the heating element is unstable, such as local damage or poor contact of the heating wire, which leads to unstable heating power.
Solution: Check and calibrate the sensor, and replace it promptly if it is severely aged; Check if the heating element is securely connected and if there are any signs of damage. If there is any damage, replace the corresponding heating element.

The temperature cannot reach the set value
Reason: Insufficient heating power, possibly due to partial damage to the heating element, resulting in actual heating power lower than the design power; The insulation performance of the furnace body decreases, such as aging or damage of insulation materials, which causes rapid heat dissipation.
Solution: Conduct a comprehensive inspection of the heating element, identify damaged parts, and replace them; Check the insulation material and repair or replace it promptly if it is damaged.

Abnormal temperature display
Reason: Damaged or poorly connected temperature sensor; Temperature controller malfunction; Display screen malfunction.
Solution: Check if the temperature sensor is damaged or poorly connected, and replace or tighten it if necessary; Check if the temperature controller is working properly, and replace or repair it if there are any issues; Check if the display screen is damaged or poorly connected, and replace or tighten it if necessary.

Atmosphere control issues
Atmosphere leakage
Reason: The aging and damage of the sealing components have caused the atmosphere inside the furnace to leak; The connection part of the furnace body is not installed tightly.
Solution: Regularly check the condition of the seals and replace them promptly if aging or damage is found; Check if the connecting bolts of the furnace body are loose, and tighten them if they are loose.

Deviation in atmospheric composition
Reason: The gas flow meter is inaccurate, causing the proportions of various gases entering the furnace to not meet the set requirements; The gas purity inside the gas storage container is insufficient.
Solution: Check and calibrate the gas flow meter; Ensure that the gas purity inside the gas storage container meets the requirements.

Electrical system issues
Short-circuit fault
Reason: The insulation layer of the wire is damaged, causing direct contact between wires of different potentials; Electrical components are damp.
Solution: Immediately cut off the power supply, use professional electrical inspection tools to check the wires and electrical components, and identify the short circuit point; For wires with damaged insulation layers, replace them with new wires; Dry or replace damp electrical components.

Mechanical system issues
Furnace door malfunction
Reason: The furnace door transmission mechanism has malfunctioned, such as loose chains and worn gears; The furnace door is deformed.
Solution: Check the tension of the chain and adjust it if it is loose; Gears with severe wear should be replaced; For the problem of furnace door deformation, repair or replace the furnace door according to the degree of deformation.

fan failure
Reason: Blade damage, possibly due to long-term operation being affected by factors such as high temperature and airflow impact; Motor malfunction.
Solution: If the fan blades are found to be damaged, replace them promptly; If the fan cannot function properly due to a motor malfunction, follow the solution for the motor malfunction.

Motor malfunction
Reason: burnt motor winding, open circuit in power supply line; The motor bearings are damaged and the rotor is unbalanced.
Solution: In the case of motor winding burnout, it is necessary to replace the motor winding with a new one or the entire motor; Check the power supply circuit for a broken circuit, identify the point of the break, and repair it; If the motor bearings are damaged, they need to be replaced, and if the rotor is unbalanced, it needs to be balanced and corrected.