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　　 Medium-frequency electric furnace's Maintenance is crucial in production—it enables the timely detection of potential hazards, helps prevent major accidents, extends equipment lifespan, ensures production safety, improves casting quality, and reduces costs. Regularly record relevant electrical parameters, cooling water temperatures, and temperatures at key areas of the furnace body (such as the furnace bottom, furnace sides, and copper busbars of the induction coil), and continuously monitor the operation of the electric furnace. Periodically start the diesel generator to ensure its reliable performance.

　　1. Regularly perform maintenance, lubrication, and tightening on the electric furnace according to the prescribed schedule (e.g., use dry compressed air to systematically remove dust from the induction coil, copper busbars, electrical control cabinet, etc.; lubricate moving parts and tighten bolts). Medium-frequency electric furnace.

　　2. Daily observe the water pressure gauge and water temperature gauge, and check the degree of aging of the rubber delivery hoses. Regularly inspect the flow rate of each cooling water branch pipe to ensure that the pipelines are unobstructed and that there are no leaks at the pipe joints—especially at the cooling water connections inside the solid power cabinet. Leaks are strictly prohibited. If a leak is detected, tighten the clamp on the pipe joint or replace the clamp. Regularly check the water levels in the water tower spray box, expansion tank, power distribution cabinet, and water tank, and replenish the water promptly as needed. Also, frequently monitor the condition of the standby pump and operate it every 3 to 5 days to ensure its absolute reliability.

　　3. Check whether the capacitor is leaking oil. If oil is leaking from the capacitor terminals, use a wrench to tighten the nut at the base of the terminals.

　　4. Mid-term maintenance: Polish the porcelain insulators and brackets on the AC incoming line side, the diode brackets in the rectifier section, the porcelain insulators of capacitors, the main contacts of IGBTs (thyristors), as well as the copper busbars for inverters and medium-frequency AC circuits using ethanol. Replace aged water pipes in the electrical cabinet, clear blockages at the nozzle necks, replace the water-cooling blocks for (IGBT) thyristors, and also replace the insulating plates for AC copper busbars and individual capacitors.

　　 Medium-frequency electric furnace Key points for safe operation:

　　1. Preparations Before Starting the Medium-Frequency Induction Furnace

　　(1) Inspect the furnace lining. When the thickness of the furnace lining (excluding asbestos boards) falls below 65–80 mm due to wear, maintenance must be performed.

　　(2) Check for cracks. Cracks exceeding 3 millimeters in width should be filled with lining material for repair to ensure unobstructed flow of cooling water.

　　2. Precautions for increasing the use of medium-frequency induction furnaces

　　(1) Do not add wet charges. When it is absolutely necessary, place the dry charge on the furnace after loading and use the method of heating the dry charge prior to melting to evaporate the moisture.

　　(2) Chip particles should be placed, as much as possible, on the residual molten iron remaining after steel tapping. The amount added in one go should be less than 10% of the furnace capacity, and must be added uniformly. Medium-frequency induction furnace

　　(3) Do not add tubular or hollow seals. This is because the air trapped in the sealing charge expands rapidly when heated, easily leading to an explosion accident.

　　(4) Regardless of the type of charge, the next charge should be added before the previous charge has melted.

　　(5) If furnace charge containing excessive rust or sand particles is used, or if too much uywc furnace charge is added at once, “bridging” is likely to occur. Therefore, it is essential to regularly monitor the liquid level to prevent bridging. When bridging occurs, the molten iron at the bottom of the furnace will overheat, leading to erosion of the lower furnace lining and potentially even causing a furnace breakthrough accident.

　　3. Medium-Frequency Induction Furnace Molten Iron Temperature Management

　　Please remember that during the production process, do not heat the molten iron to a temperature higher than that required by the casting material. Excessively high molten-iron temperatures can shorten the service life of the furnace lining. In acidic furnace linings, the following reaction occurs: SiO2 + 2C = Si + 2CO. When the molten-iron temperature exceeds 1500°C, this reaction proceeds rapidly, altering the composition of the molten iron, burning off carbon elements, and increasing the silicon content.