The medium frequency induction heating furnace adopts the principle of electromagnetic induction heating. With the help of the inductor, the alternating magnetic field is generated to produce the induced current of the same frequency. The uneven distribution of the induced current in the workpiece makes the surface of the workpiece strong, the interior weak and close to 0 to the heart, so as to achieve the purpose of heating. However, because it is a heating equipment, you should know these precautions when using it.  
1. The medium frequency induction furnace shall adopt a special rectifier transformer to increase the power supply voltage and limit the no-load operation of the transformer.  
2. Standardize the installation, shorten the connection between high voltage, transformer, medium frequency power supply and electric furnace, and select T2 copper or oxygen free copper with high purity, especially induction coil and water-cooling cable. Increasing its cross-sectional area can effectively reduce current and heat loss.  
3. Select the medium frequency electric furnace with appropriate capacity and frequency according to the casting process, increase the power density to improve the melting efficiency and reduce the additional loss.  
4. Steel shell furnace body with furnace cover is preferred to reduce heat loss and electromagnetic loss of furnace wall and furnace mouth. The furnace shell is connected to prevent short circuit caused by metal contact during operation.  
5. Formulate reasonable casting process, standardize process operation and scientific management from modeling, material selection, melting, pouring, heat treatment and cleaning, so as to reduce energy consumption.  
6. Strengthen equipment management and maintenance, reduce failure rate and ensure smooth production.  
7. Regularly check whether the connecting parts of each conductive system are in good contact, especially whether the screws at the connection between the water-cooling cable and the induction coil are fastened. The insulating table and insulating boots must be inspected once a year.  
8. It is strictly forbidden to cut off power and water during the smelting process. Pay attention to the outlet water temperature and water pressure at any time during the smelting process to keep the water pressure at 0.1 ~ 0.3MPa and the outlet water temperature below 55 °.  
9. During charging operation, the cold and wet furnace charge shall be dried first and shall not be directly added into the molten liquid. It is best to avoid using the metal cutting in the first furnace, because the metal cutting can penetrate into the furnace lining gap; Molten iron can be poured into the furnace only when the furnace is heated to about 1000 ℃, and iron block induction heating can be added to the furnace heating.
10. The freezing and sealing time of furnace charge shall not be too long to avoid furnace explosion; After sintering the furnace lining, it is advisable to use 30 ~ 50% of the rated power and work continuously for more than 5 furnaces.