Copper Sleeve (Copper Contact Shoe) for Electric Arc Furnaces
The copper sleeve is a critical component of electric arc furnaces. During operation, it is pressed tightly onto the electrode shell by a pressure ring. Its primary function is to transmit secondary current to the electrode and feed it into the furnace while ensuring proper electrode baking.
Working Conditions
The copper sleeve operates under extremely harsh conditions, enduring high temperatures, hot furnace gases, and heavy dust. When furnace conditions are abnormal (e.g., flame spouting), the environment becomes even more severe, leading to premature wear and damage.
Another challenge is that the contact between the copper sleeve and the electrode is not fixed—it must be adjusted periodically as the electrode burns down, further worsening its working conditions.
Requirements for Copper Sleeves
● Excellent electrical conductivity
● High-temperature resistance
● Sufficient mechanical strength at elevated temperatures
● Simple structure for easy replacement
Material & Manufacturing
● Made from T2 forged copper for high density
● Cooling water channels are precision-drilled using deep-hole drilling to ensure superior conductivity and cooling performance
● Reduces power loss and extends service life
Basic Structure
● Copper Sleeve Body: The main structure, forged from high-quality copper for strength, conductivity, and heat resistance.
● Top Head Seat Hole: Located on one side, connects with the electrode for current transmission and mechanical linkage.
● Cooling Water Channel: Internal channels circulate cooling water to dissipate heat and maintain operational stability.
● Conductive Copper Tube: Connects to the cooling channel for current transfer. The tube’s increased contact area ensures stable transmission.
● Hanging Plate: Some sleeves include an arc-shaped hanging plate with a hole for easy installation and secure electrode contact.
Key Features
✔ High Conductivity: Forged copper enhances internal density, improving current transfer efficiency.
✔ Superior Heat Dissipation: Rapid heat transfer to cooling water prevents overheating.
✔ Strength & Heat Resistance: Withstands extreme furnace conditions (high temp, heavy current, slag erosion).
✔ Sealing Performance: High-temp seals prevent cooling water leaks.
Functions & Importance
● Current Transmission: Delivers power to electrodes, generating arcs for metal smelting.
● Electrode Support & Fixation: Ensures stability and positioning accuracy.
● Electrode Protection: Reduces resistance, heat loss, and wear, extending electrode lifespan.
Maintenance
● Regular Inspection: Check for damage, cooling channel blockages, and secure connections.
● Cleaning & Upkeep: Remove surface slag and replace cooling water to maintain efficiency.
● Troubleshooting: Address leaks or conductivity issues immediately to prevent further damage.
