中频感应熔炼炉工作频率在50Hz-10kHz 之间,需用变频器予以调频。中频感应熔炼炉以其电效率和热效率高、熔炼时间短、耗电较省、占地较少、投资较低、生产灵活和易于实施过程自动化等, 比工频感应熔炼炉更有优势。它适合熔炼各种铸铁, 特别适合熔炼合金铸铁、球墨铸铁和蠕墨铸铁,并对炉料的适应性较强, 炉料的品种和块度可在较宽范围内变动。中频感应熔炼炉具备其它铸铁熔炼用炉没有的优点, 使其近年来得到令人瞩目的发展,并在铸铁生产中广泛采用。 Medium frequency induction melting furnace working frequency between 50 hz to 10 KHZ, need FM frequency converter. Medium frequency induction melting furnace with its electrical efficiency and high thermal efficiency, short smelting time, the province, covers an area of less power consumption, low investment, flexible and easy to implement production process automation, etc., have more advantages than the power frequency induction furnace. It is suitable for various cast iron smelting, is especially suitable for smelting alloy cast iron, nodular cast iron and vermicular cast iron, and good adaptability of furnace charge, the burden of the breed and fragmentation can change in a wider scope. Medium frequency induction melting furnace has the advantages of the other cast iron smelting furnace without, make its get remarkable development in recent years, and widely used in the production of cast iron. 1、可控硅变频器 1, thyristor converter 中频感应熔炼炉的发展得益于可控硅变频器的使用。这种变频器通过直流中间回路, 用电子装置将三相交流电频率转换为所需的频率, 其效率95%-98%。新一代变频器采用数控电子线路为变频器提供了各种控制调节和保护功能。中频感应熔炼炉使用的变频器额定功率不断提高, 9000kW 变频器连接在12t 的炉子上, 铁液的熔化率为18t / h; 将中频感应熔炼炉功率密度提高到1000kW/ t , 能使熔化期缩短到35min。感应熔炼炉的熔化率依炉子的容量而变化, 一般中频感应熔炼炉熔化铁液的熔化率为0.14-35t / h。例如, 使用2t 容量的炉子, 可得到2 -2.38t/ h 的熔化率, 使用12t 容量的炉子则可达到18-21t/ h 的熔化率; 而采用工频感应熔炼炉熔化冷料的熔化率是: 115t 炉为0.75t/ h、3t 炉为1.5t/ h、5t炉为2.5t/ h、10t 炉为4t / h。可见中频感应熔炼炉的熔化率远大于工频感应熔炼炉, 这就可在选择铸铁生产熔炼设备时以小代大, 使用较小容量的中频感应熔炼炉代替较大容量的工频感应熔炼炉, 既减少了占地面积, 又降低了投资, 也保证了铁液的连续供应, 对于连续作业、生产能力较大的铸铁生产厂家十分有利。将中频感应熔炼炉用于连续铸造和离心铸造球墨铸铁管生产的铁液熔炼, 以它代替冲天炉, 或与高炉、冲天炉进行双联, 其生产能力将可得到充分发挥。 The development of the medium frequency induction melting furnace thanks to the use of thyristor inverter. This kind of inverter dc intermediate circuit, the three-phase alternating current frequency conversion with electronic devices for the required frequency, the efficiency of 95% to 95%. A new generation of inverter adopts numerical control circuit for frequency converter provides a variety of control and protection functions. Medium frequency induction melting furnace using the converter power rating, 9000 kw inverter connected to the 12 t on the stove, iron melting rate of 18 for t/h; The medium frequency induction melting furnace power density increased to 1000 kw/t, can make the melting period reduced to 35 min. Induction furnace melting rate varies according to the capacity of the furnace, the general medium frequency induction furnace melting iron melting rate is 0.14-35 t/h. For example, using the 2 t capacity stove, can get the fusion rate of 2-2.38 t/h, use the capacity of 12 t furnace can reach 18-21 t/h melting rate; With power frequency induction furnace melting slag melting rate: 115 t furnace is 0.75 t/h, 3 t furnace is 1.5 t/h, 2.5 t/h 5 t furnace, 10 t furnace for 4 t/h. Visible medium frequency induction furnace melting rate is greater than the power frequency induction melting furnace, it is a when choosing cast iron smelting production equipment with small generation, using a smaller capacity of medium frequency induction melting furnace instead of large capacity of power frequency induction melting furnace, both reduced the area, and reduce the investment, and ensures the continuous supply of iron liquid, for continuous operation, production capacity of large cast iron manufacturers. The medium frequency induction melting furnace used for continuous casting and centrifugal casting ductile iron pipe production of iron smelting, replace the cupola with it, or double with blast furnace, cupola, its production capacity will be available to give full play to.