Precautions for use of medium frequency induction heating furnace
The medium frequency induction heating furnace adopts the principle of electromagnetic induction heating. The induction current of the same frequency is generated by the alternating magnetic field generated by the inductor. The uneven distribution of the induction current in the workpiece makes the surface of the workpiece strong and 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 wiring between high-voltage, transformer, intermediate 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 heat loss.  
3. According to the casting process, select the appropriate capacity and frequency medium frequency electric furnace, 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 connection of furnace shell shall prevent metal contact from forming short circuit during operation.  
5 formulate reasonable casting process, standardize process operation from modeling, material selection, melting, pouring, heat treatment, cleaning and other aspects, and conduct scientific management 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 smelting. Pay attention to outlet water temperature and pressure at any time during smelting 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 chipping in the first furnace, because the metal chipping can penetrate into the furnace lining gap; Molten iron can only be poured into the furnace when it 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, 30 ~ 50% of the rated power should be used for continuous operation of more than 5 furnaces.