I. Precautions Before Start-up
1. Check that the power supply, wiring, and grounding wire are secure, free from aging, damage, or loose connections. Operation with a single phase is strictly prohibited.
2. Check that the heating elements, temperature control probes, and thermocouples are intact, and that the probes are not misaligned or have accumulated ash or coke.
3. Clean the furnace thoroughly, removing any debris, oil, or flammable materials. Ensure the ventilation and dehumidification system is unobstructed.
4. Check the tension of the conveyor belt/chain plate, drive motor, reducer, and ensure smooth operation without jamming or deviation.
5. Confirm that the over-temperature alarm, emergency stop switch, temperature control instruments, and timer are functioning correctly.
6. Preheat the furnace at a low temperature under no-load conditions. Do not directly raise the temperature to high levels at once to prevent damage to the heating elements from sudden heating.
II. Precautions During Operation
1. Increase the temperature gradually during the heating phase. Rapid heating is strictly prohibited. The set temperature should not exceed the equipment's rated maximum temperature. 2. Workpieces should be placed evenly, avoiding excessive width, height, or overlapping to prevent obstruction of air ducts and localized overheating.
3. Flammable, explosive, volatile solvents, alcohol, paint, and other similar materials are prohibited from being brought into the furnace to prevent fires or explosions.
4. During operation, it is strictly forbidden to open the furnace door, put hands inside the furnace, or cross the operating conveyor belt.
5. Continuously monitor the temperature control instruments and actual furnace temperature for overheating, temperature control malfunction, or heating element failure.
6. Observe the transmission system: ensure there are no abnormal noises, no deviation, and no slippage. Regularly check the tension of the chain/conveyor belt.
7. Maintain ventilation in the workshop. Exhaust gases and hot air should be discharged through the centralized exhaust ducts, avoiding direct airflow onto personnel.
8. In case of equipment malfunction (smoke, odor, tripping, abnormal noise), immediately press the emergency stop button, disconnect the power, and then investigate.
III. Material & Process Compatibility Considerations
1. Pre-baking of workpieces containing water or solvents is required. High-moisture materials must not be directly introduced into the high-temperature zone to prevent boiling over and corrosion from condensation inside the furnace.
2. Control the baking speed and temperature of oily or coated workpieces to avoid blistering, yellowing, cracking, and spontaneous combustion.
3. Do not mix workpieces of different materials or with different processes to prevent cross-contamination and temperature mismatch.
IV. Shutdown and Closure Considerations
1. After production, cool down before disconnecting the power. Turn off the heating first, but allow the conveyor belt to continue running unloaded until the furnace temperature drops below 80℃ before shutting down the entire machine.
2. Never directly disconnect the main power supply while the furnace is at high temperature to avoid damage to the heating elements and instruments due to residual heat.
3. Clean the furnace interior, removing any residue, fallen workpieces, and debris adhering to the conveyor belt to keep the furnace clean.
4. For long-term shutdowns, disconnect the main power supply and provide dust and moisture protection. V. Daily Maintenance & Upkeep
1. Regularly clean the heating elements, air ducts, and furnace chamber to prevent aging of the insulation cotton and decreased heating efficiency.
2. Regularly calibrate thermocouples and compare temperature control instruments to ensure accurate temperature readings.
3. Regularly lubricate transmission parts, check chain wear, and regularly tension and correct belt misalignment.
4. Regularly dust the electrical cabinet and check contactors, relays, and terminals for overheating or oxidation.
5. Re-inspect equipment grounding annually and regularly test the leakage current device.
VI. Safety Prohibitions (Red Lines)
- Overloading, unauthorized wiring modifications, and unauthorized increases in heating power are strictly prohibited.
- Operating equipment with defects or forcibly starting a faulty unit is strictly prohibited.
- Keep children and unauthorized personnel away from the operating area.
- Never directly pour water onto the furnace body to cool it down under high temperatures.
