Weekly Must-Do 5 Inspections (Basic Maintenance for Daily Stable Operation)
1. Furnace Chamber Cleaning and Seal Inspection
Inspection Content: Remove residual oxide scale, carbon deposits, and material debris from the furnace chamber; check the integrity of door seals and observation window gaskets for aging, damage, or deformation.
Operation Points: After cooling to room temperature, use specialized tools (such as steel brushes and vacuum cleaners) to clean the furnace chamber, avoiding hard objects that could scratch the chamber walls. If seals show leakage traces, tighten or replace them promptly.
Maintenance Purpose: Ensure furnace chamber sealing performance, reduce heat loss, improve heating uniformity; prevent residues from affecting product processing precision and prevent energy consumption increases from seal failures.
2. Cooling System Operation Status Check
Inspection Content: Check cooling water pipes, water tanks, and cooling tower operation, confirm normal water flow pressure (matching equipment rated parameters), with no leakage or blockages; check coolant level and cleanliness.
Operation Points: Verify water pressure data with pressure gauges, clean pipeline filter impurities; replenish coolant when insufficient, and completely replace if turbid or degraded.
Maintenance Purpose: Prevent cooling system failures that could cause equipment overheating, protecting core components such as heating elements and furnace body from damage.
3. Temperature Control Instruments and Sensor Calibration
Inspection Content: Compare temperature control instrument display values against standard thermometer errors, confirm thermocouples and RTD sensors are securely connected without looseness or corrosion.
Operation Points: Perform simple calibration per equipment manual instructions; if error exceeds the allowable range, contact professional technicians for repair. If sensor wiring shows oxidation, sand it down and re-tighten.
Maintenance Purpose: Ensure temperature control precision, preventing substandard product heat treatment quality due to inaccurate temperature measurement.
4. Electrical Wiring and Terminal Inspection
Inspection Content: Inspect power lines, control cabinet terminals, contactors, and other electrical components for signs of heating, scorching, or damaged cable insulation.
Operation Points: Perform inspection in a power-off state, tighten loose terminals with a screwdriver, clean dust inside the control cabinet; immediately replace aged or damaged cables to avoid short circuit risks.
Maintenance Purpose: Eliminate electrical safety hazards, ensure stable power supply to equipment, prevent unexpected power interruptions or electrical faults from affecting production.
5. Safety Protection Device Functional Testing
Inspection Content: Test over-temperature alarms, over-pressure protection, emergency stop buttons, and other safety devices for sensitivity and effectiveness; check ventilation and dust removal systems for normal operation without abnormal noise.
Operation Points: Simulate trigger conditions to verify alarm response speed, confirm that emergency stop buttons quickly cut power; clean dust removal filters to ensure proper ventilation.
Maintenance Purpose: Fortify the safety production line, preventing equipment damage or personnel safety incidents due to safety device failure.
Monthly Must-Do 5 Inspections (Deep Maintenance to Extend Equipment Service Life)
1. Heating Element Wear and Aging Detection
Inspection Content: Check heating wire and heating tube surfaces for deformation, breakage, or oxidation peeling; measure element resistance values within rated range.
Operation Points: Compare resistance data of heating elements in different areas; replace if significant differences exist; if element mounting bases are loose, re-secure and ensure insulation treatment.
Maintenance Purpose: Avoid localized heating element damage causing uneven furnace heating, reducing downtime maintenance costs caused by element failure.
2. Furnace Chamber Refractory Material Condition Check
Inspection Content: Check furnace chamber walls, roof, and floor refractory bricks and castables for cracking, detachment, or erosion, focusing on wear conditions in high-temperature areas.
Operation Points: Minor cracking can be filled with specialized repair materials; if damage area is large, shutdown for localized emergency repair is needed; avoid sharp objects impacting the refractory layer.
Maintenance Purpose: Protect furnace body structural integrity, prevent high-temperature gas leakage, extend furnace chamber service life, reduce energy loss.
3. Transmission Mechanism Lubrication and Operation Check
Inspection Content: For furnace door lifting mechanisms, conveyor belts, turntables, and other transmission components, check lubricant levels and lubrication effectiveness, verify smooth component operation without sticking or abnormal noise.
Operation Points: Apply manufacturer-recommended lubricants per equipment requirements, clean oil stains from component surfaces; adjust transmission belt tension, replace severely worn gears and bearings.
Maintenance Purpose: Reduce transmission component friction wear, ensure smooth equipment operation, lower mechanical failure rates.
4. Hydraulic/Pneumatic System Pressure and Seal Check
Inspection Content: If equipment has hydraulic or pneumatic systems, check system pressure stability, inspect oil and air pipes and joints for leakage; check hydraulic oil and compressed air cleanliness.
Operation Points: Use professional instruments to detect system pressure, tighten loose joints; regularly replace hydraulic oil filter elements, drain condensed water from compressed air storage tanks.
Maintenance Purpose: Ensure normal hydraulic/pneumatic system operation, avoiding impact on equipment movement precision due to insufficient pressure or leakage.
5. Equipment Operation Data Recording and Analysis
Inspection Content: Organize weekly maintenance records, compile equipment operating parameters (such as heating time, energy consumption, fault frequency), analyze data change trends.
Operation Points: Establish equipment maintenance ledgers, record abnormal conditions and treatment results; compare historical data to identify potential fault hazards (e.g., sudden energy consumption increase may indicate seal failure).
Maintenance Purpose: Optimize maintenance plans through data-driven management, achieve predictive maintenance, reduce unplanned downtime.
Conclusion
Heat treatment furnace maintenance must adhere to the principle of "prevention first, regular inspection, timely rectification." Weekly basic inspections focus on daily equipment operating status, while monthly deep inspections emphasize core component wear and system performance. Companies can refine maintenance standards based on equipment models, usage frequency, and production environment, clarify responsibility assignments, and maximize equipment efficiency through standardized operations, providing solid assurance for producing high-quality products.
