Daily maintenance of Hybrid Furnace

The daily maintenance of Hybrid Furnace (tube furnace box furnace integrated equipment) needs to be combined with the commonalities and modular characteristics of tube furnace and box furnace, and carried out from five dimensions: cleaning, inspection, calibration, environmental control, and safe operation. The specific maintenance points are as follows:

1. Cleaning and dust treatment
Internal cleaning of furnace
Tube furnace module: After each experiment, clean the residual powder inside the furnace tube with a soft brush or vacuum cleaner to avoid high-temperature carbonization and corrosion of the furnace tube. For carbon deposition, the furnace tube can be soaked in 10% dilute hydrochloric acid for 2 hours and then rinsed (ensuring compatibility of the furnace tube material).
Box type furnace module: Use a soft brush to clean the dust, debris, and oxide scale inside the furnace every month. The furnace wall stains can be wiped with a slightly damp soft cloth, but it is necessary to avoid moisture from contacting electrical components and heating parts to prevent short circuits.
Joint mode: If the equipment supports the collaborative work of tube furnace and box furnace, the two modules need to be cleaned separately after the joint experiment to avoid cross contamination.
External cleaning of furnace body
Wipe the exterior of the furnace and control panel with a damp cloth or specialized cleaning agent every week to prevent dust accumulation from affecting heat dissipation.

2. Key component inspection and maintenance
Heating element inspection
Tube furnace module: visually inspect heating wires (such as silicon molybdenum rods, resistance wires) monthly for oxidation, fracture, or localized melting. Tighten the wiring terminals between the heating element and the power supply every quarter to avoid local overheating caused by poor contact. If the diameter of the heating wire shrinks by more than 20% of its original size, or if the resistance value changes by more than ± 10%, it needs to be replaced immediately.
Box type furnace module: Open the furnace door every month to check whether the resistance wire is broken or deformed, ensuring uniform heating.
Sealing performance inspection
Tube furnace module: Fill the furnace tube with 0.1MPa nitrogen gas every month, apply soapy water to the interface, and observe the bubbles to determine leakage. Use a vacuum gauge to test the ultimate vacuum degree every quarter. If it is below 10 ⁻ ² Pa, check the sealing ring or vacuum pump.
Box type furnace module: Check the furnace door sealing strip monthly for aging and deformation, and replace it if necessary. During operation, the furnace door should not be opened or closed. It is strictly prohibited to open the door when the temperature is above 300 ℃ to prevent rapid temperature changes from damaging the equipment.
Electrical system inspection
Check the power cord for damage and aging every month, with a focus on inspecting cables in high-temperature areas (such as behind the furnace). Tighten the screws at the electrical connection points every quarter to ensure system stability. Invite professional personnel from manufacturers to conduct comprehensive maintenance every year, check the insulation performance, and replace insulation materials if necessary.

3. Temperature control system calibration
Temperature controller calibration
Use high-precision thermocouples (such as S-type) to calibrate the temperature measurement points inside the furnace every six months. If the error exceeds ± 5 ℃, adjust the PID parameters. The typical PID regulation values are P=30%, I=120 seconds, D=30 seconds, and temperature overshoot protection (such as ± 10 ℃) is also set to avoid damage to the heating element due to overheating.
Program testing
Run a step-by-step heating program every quarter (such as increasing from 20 ℃/min to 1000 ℃), record the deviation between the actual temperature curve and the set value, and ensure temperature control accuracy.

4. Environmental Control and Ventilation
Environmental humidity management
Maintain the operating environment humidity not exceeding 85% to avoid corrosion of electrical systems and furnace bodies by moisture. When not in use for a long time, cover the equipment with dust-proof cloth and choose materials with good breathability to prevent internal moisture.
Ventilation system maintenance
Ensure good ventilation around the equipment to prevent erosion from high-temperature exhaust gases. Check the ventilation and smoke ducts monthly to ensure they are unobstructed and avoid blockages caused by insect nesting or debris accumulation in spring and summer.

5. Safe operation and training
Operating Specifications
It is strictly prohibited to use equipment beyond the rated temperature, and the heating rate should not be too fast (recommended ≤ 10 ℃/min) to avoid thermal stress damage to the furnace. Sample placement should avoid direct contact with heating elements, and volatile/corrosive samples should be stored in sealed containers.
personnel training
Regularly provide technical training and safety education to operators to enhance their operational skills and ability to respond to emergencies. Develop detailed safety operating procedures, including emergency response measures, to ensure that operators operate in accordance with regulations.

6. Lubrication and vulnerable parts management
lubrication
Apply high-temperature grease (such as molybdenum disulfide) to the furnace door slide every six months to reduce friction and wear.
Replacement of vulnerable parts
Establish a list of vulnerable parts (such as sealing rings and heating elements), regularly inspect and replace severely worn components in a timely manner to avoid losses caused by downtime.