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Medium frequency Steel-shell furnace There are many components, and a large component itself may include numerous smaller ones. Today, we’ll introduce you to the structural components of the furnace body.

(1) Intermediate frequency Steel-shell furnace The induction coil: The induction coil is the heart of the induction furnace. It converts electromagnetic energy into thermal energy, thereby melting the metal charge in the crucible. The coil is made by winding rectangular copper tubes into a multi-turn spiral shape. Its surface is coated with high-strength insulating paint and wrapped with insulating tape. Additionally, fire-resistant clay is applied between turns of the coil in medium-frequency furnaces. Water-cooling rings are installed above and below the induction coil.

(2) Intermediate frequency Steel-shell furnace Magnetic yoke of the induction furnace: The magnetic yoke is assembled from high-quality silicon steel laminations and is arranged around the outside of the induction coil, serving as a supporting framework. It also helps confine the stray magnetic flux leaking from the induction coil, thereby preventing heating of metal components.

(3) Water-cooled cables for induction furnaces: Due to the frequent tilting of the furnace, the flexible conductors in the water-cooled cables may break, and loose connection bolts at the terminal ends could lead to current imbalance. Typically, the service life of water-cooled cables is set at three years based on the number of furnace tilts; after three years, they must be replaced. If the bolts show discoloration, they should be promptly tightened or replaced.

(4) Intermediate frequency Steel-shell furnace Lining of the furnace equipment: Induction furnaces operate at high temperatures and experience significant temperature fluctuations during production. They are also subjected to slag erosion and electromagnetic stirring. The high-temperature molten iron directly erodes the crucible lining, making it extremely vulnerable to damage. Moreover, refractory construction costs are high. Therefore, extending the service life of induction furnace linings and reducing the frequency of refractory repairs are crucial for cost reduction.

(5) Intermediate frequency Steel-shell furnace Crucible Leakage Alarm System for Equipment: To ensure safe production, prevent crucible leakage accidents and their escalation, and facilitate the assessment of furnace lining condition to extend the furnace’s service life, it is essential to install a crucible leakage alarm system. Typically, a DC-type alarm device is used, featuring a stainless steel wire bottom electrode that comes into contact with the molten iron and a stainless steel plate (or mesh) side electrode (the second electrode) positioned between the bottom electrode and the furnace lining induction coil.

It can be seen that each component of the energy-saving medium-frequency furnace equipment has its own specific function. Yet, these components rely on their respective functions to work in coordination and collaboration with other parts.