General Maintenance Applicable to All Industrial and Heat Treatment Furnaces
1. Daily Cleaning
Clean oxides, dust, oil stains, and debris from the furnace chamber. Accumulated buildup can affect heating efficiency and accelerate component aging.
2. Temperature Control System
Calibrate temperature control instruments, thermocouples, and temperature probes to eliminate temperature deviations. Check circuits to prevent aging, short circuits, or loose connections.
3. Heating Element Maintenance
Inspect heating wires, heating tubes, and silicon carbide rods for breakage, deformation, or corrosion. Tighten loose connections and promptly replace any that are burnt out.
4. Furnace Body Sealing
Check furnace doors, furnace mouths, and platform sealing strips and gaskets for air leakage. Air leakage increases energy consumption. Ensure the furnace chamber atmosphere is maintained.
5. Electrical and Gas Protection
Inspect circuit connectors, contactors, relays, and gas pipelines. Immediately stop and repair if any abnormality is detected.
6. Safety Protection
Check over-temperature protection devices, emergency stop switches, furnace body grounding, and heat dissipation and ventilation devices to ensure all safety protection systems are functional.
7. Periodic De-energized Inspection
After shutdown, inspect hot components after they have naturally cooled. Do not directly start up with load immediately.
Annealing Furnace and Pit Furnace Specialized Maintenance
Strictly control heating and cooling rates to prevent rapid heating or sudden cooling, which can cause cracks in the furnace liner or furnace body structure.
Arrange furnace workpieces with appropriate gaps. Avoid dense stacking to ensure uniform temperature circulation.
In pit furnaces, strictly control furnace temperature and stability. Clean scale and protective coatings from the pit interior to ensure smooth hot air circulation.
For platform-type annealing furnaces, focus on maintaining the lifting mechanism, guides, and chains. Apply lubrication regularly to prevent clamping or deviation.
When loading and unloading during annealing, use care to avoid scratching the furnace chamber, burning plates, or heating elements.
Tempering Furnace Specialized Maintenance
Circulation Fan: Top Priority
Regularly check the hot air circulation fan blades and bearings and apply grease. The fan directly determines temperature uniformity. Never overlook this.
Thoroughly clean oxide scale and dust from the tempering furnace chamber to ensure hot air circulation and heat transfer.
Check the furnace body insulation layer to eliminate localized uneven temperature or heat dissipation issues that affect tempering effectiveness.
Inspect the charging racks regularly for deformation or breakage to prevent workpiece tipping or equipment jamming.
Control furnace chamber humidity and cleanliness. Prevent water vapor from entering and causing hydrogen embrittlement or oxidation.
Strictly follow process standards for temperature control system calibration. Control the tempering temperature and holding time precisely.
Strictly Prohibited Maintenance Practices
- When performing maintenance, disconnect power, allow the furnace to cool, and strictly prohibit hot work or powered inspection.
- During furnace interior work, use low-voltage lighting and high-temperature resistant protective equipment to prevent burns and dust inhalation.
- Before entering the furnace for inspection, first open the furnace door for ventilation, then enter after the gas has dissipated.
- Strictly prohibit unauthorized modification of circuits, modification of heating power, or disabling of safety protection devices.
- When replacing sealing components and thermocouples, calibrate before use. Do not cut corners during installation.
- If the equipment experiences vibration, abnormal odor, or circuit breaker tripping, stop immediately for investigation. Do not force continued operation.
