How to Operate a Mesh Belt Annealing Furnace

Industrial annealing furnaces are custom-designed non-standard electric furnaces tailored to user specifications, primarily employed for heat treatment processes such as quenching and heating of various workpieces within the aluminium industry.

Industrial annealing furnaces are extensively employed for quenching various rod-shaped components, long shafts, and parts requiring surface wear resistance, such as gears and rollers. Pit-type quenching (tempering) furnaces involve heating metal workpieces to a suitable temperature, maintaining it for a period, then rapidly cooling them by immersion in a quenching medium. Common quenching media include brine, water, mineral oil, and air. The furnace shell employs a welded frame structure using sectional steel and steel plates. Furnace cover operation may utilise overhead cranes, manual lifting beams, or electric hydraulic systems. Furnace lining: standard or full-fibre construction may be employed. The furnace opening incorporates a protective collar, designed to accommodate workpiece hooks and shield the opening from impact damage by components, thereby preventing heat loss and ensuring uniform furnace temperature distribution.

1. The machine room must be well-ventilated, maintained clean, tidy, and dry. Equipment operation requires a minimum of two personnel, with a designated operator in charge. Operators must be familiar with and adhere to quenching equipment operating procedures, wearing prescribed protective gear. Workpieces must be free of burrs, metal filings, and oil residues to prevent arcing. During operation, ensure workpieces do not contact the induction coil to avoid arcing. When using high-frequency quenching machines, adhere strictly to operational protocols for electrical, mechanical, and hydraulic systems. Repairs must be conducted by authorised personnel; discharge capacitors using a discharge rod before maintenance. Emergency repairs under live conditions are strictly prohibited.

2. Quenching furnaces utilise industrial electrical frequencies, low voltage, and high current to perform heating quenching or normalising on large workpieces. Electrical safety regulations must be strictly adhered to during operation.

3. To prevent injury from explosions during high-induction heating of large components, manufacturers of mesh belt annealing furnaces must strictly comply with high-frequency heat treatment operating procedures and corresponding large-item heat treatment process specifications. Each large workpiece must undergo ultrasonic flaw detection beforehand. Any components exhibiting white spots, severe segregation, porosity, or similar defects are prohibited from high-frequency heating. Workpieces must be deburred and cleaned of iron filings and oil contamination to prevent arcing. During production, a designated supervisor must be appointed, and operators must be thoroughly familiar with and strictly adhere to the high-frequency induction heating equipment operating procedures.