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　　 Medium-frequency electric furnace Maintenance is of great importance in production. Proper maintenance can promptly identify various potential hazards, prevent major accidents, extend the service life, ensure production safety, improve casting quality, and reduce costs. Operators should regularly record relevant electrical parameters, cooling water temperatures, and temperatures at key parts of the furnace (such as the furnace bottom, furnace sides, and copper busbars of the induction coil housing), and continuously monitor the operation of the electric furnace. Under normal circumstances, the diesel generator should be started periodically to ensure the reliable operation of the medium-frequency electric furnace.

　　Daily Maintenance of Medium-Frequency Induction Furnaces: 1. Perform regular maintenance, lubrication, and tightening of the furnace according to prescribed intervals. For example, use an air-compression system without water to remove dust from the induction coil, copper busbars, electrical cabinets, and other components; lubricate moving parts and tighten bolts. 2. Daily check the water pressure gauge and water temperature gauge, and inspect the hoses for signs of aging. Regularly verify the flow rate in each cooling-water branch pipe to ensure that the pipes are unobstructed and that there are no leaks at pipe joints—especially those in the solid-power cabinet. If a leak is detected, tighten the hose clamp or replace it. Periodically check the water level in the water tower spray basin and expansion tank, as well as the water levels in the power cabinet and water tank, and replenish them promptly. Frequently monitor the status of the standby pump and operate it every 3–5 days to ensure its reliable performance. 3. Inspect capacitors for oil leakage. If oil leakage is found at the capacitor terminals, use a wrench to tighten the nut at the base of the terminal. 4. Mid-term maintenance: Use ethanol to clean and polish the porcelain insulators on the AC input side, supports, diode brackets in the rectifier section, capacitor porcelain insulators, main contact points of the IGBT (thyristor), inverters, and medium-frequency AC copper busbars. Replace aged water pipes in the electrical cabinet, clear any blockages in faucet necks, replace the water-cooling blocks for IGBT thyristors, and replace the insulating plates for AC copper busbars and individual capacitors.

　　Key points for safe operation of medium-frequency induction furnaces: 1. Start-up Medium-frequency electric furnace Prior preparation: Inspect the lining. If the lining thickness (excluding the asbestos board) after wear falls below 65–80 millimeters, maintenance is required. Check for cracks. Cracks exceeding 3 millimeters should be repaired using lining materials to ensure unobstructed flow of cooling water. 2. Precautions when adding a medium-frequency induction furnace: Do not add wet charge materials. If it is absolutely necessary, first place dry charge materials into the furnace and then put the wet materials on top; use the heat generated inside the furnace before melting to evaporate the moisture. Chips should be placed as much as possible on the residual molten iron left after tapping; the amount added at one time should be less than 10% of the furnace capacity and must be evenly distributed. Do not add tubular or hollow sealing agents. This is because the air trapped within sealed charge materials expands rapidly when heated, easily leading to explosion accidents.

　　 Medium-frequency electric furnace In the event of an emergency, remain calm, stay calm, and handle the situation correctly to prevent the accident from escalating and minimize its impact. Therefore, it is essential to be familiar with potential accidents that may occur in induction furnaces and to know the proper procedures for dealing with them.