The pit-type tempering furnace is a cylindrical, periodic-operation industrial heat treatment equipment, primarily used for tempering and normalizing metal parts, and quenching, annealing, and aging treatment of light alloys such as aluminum alloy die castings. Its outer shell is constructed of welded steel sections and plates, equipped with an electric hydraulic lifting furnace cover and a hot air circulation system. Temperature uniformity is maintained at ≤±3℃ through air guide ducts and circulating fans.
This equipment employs three-zone independent temperature control technology. Heating elements are made of high-resistance iron-chromium alloy strips, and the furnace lining often uses all-fiber aluminosilicate modules or composite refractory materials to enhance energy efficiency. The electrical system integrates an intelligent temperature controller, frequency controller, and paperless recorder, featuring automatic alarms, process time prompts, and power interlock safety functions. The maximum load capacity is 15,000 kg, and the effective heating zone size is Φ2800×1600 mm. Some models support a drip-feed protective atmosphere to reduce oxidation and can be remotely controlled via a PLC/PID system.
