With the continuous improvement of the power density of the intermediate frequency melting furnace , the safety of the furnace, the life of the lining and the noise are getting higher and higher , and the rationality of the structure of the furnace is becoming more and more important . The heavy steel furnace is durable. High strength, high efficiency and productivity, low noise, easy maintenance and many other advantages. Unlike the frame furnace , the heavy-duty steel shell furnace has a high-strength annular steel shell with a plurality of large inspection ports . When the furnace is running , the inspection port is closed, and each inspection port can be opened during inspection. The internal structure of the heavy-duty steel shell furnace is strong , which can avoid the deformation that may occur when pouring the cast iron and prolong the life of the lining. Moreover, due to the closed solid steel shell and the interior thereof, the sound absorbing insulation material can be added , so that the working noise is greatly reduced. The sturdy steel shell also effectively protects the induction coil from the risk of splashing metal , giving the furnace maximum safety during operation. In order to effectively insulate and improve the life of the lining , the heavy-duty steel shell furnace is also provided with a cooling ring at the top and the bottom respectively , which serves to uniform the lining temperature and reduce the thermal expansion. Stainless steel cooling low-power, high-intensity ring , greatly improving the efficiency of the furnace. 

 Heavy steel furnace steel is not only sturdy , but is designed specifically for medium frequency melting furnace thick-walled tube coil structure , and by the correct choice of the distance between the induction coil turns , so that maximum conversion efficiency of the coil, the minimum resistance. On the one hand , the thick-walled tube induction coil has a large current-carrying area and uniform wall thickness , and is less prone to damage caused by arcing and expansion ; on the other hand , the coil adopts a special support system , each of which is firmly locked and has good rigidity. It reduces the vibration caused by the electromagnetic force and greatly prolongs the service life of the lining. In addition , the induction coil is covered with 59% yoke , which effectively changes the distribution of the magnetic field . At the same time , the isolation cushion also reduces noise and vibration , increasing the efficiency of the yoke. The heavy-duty steel shell furnace also adopts an elongated coil design in which the induction coil extends and exceeds the furnace substrate portion , so that the load of the charge from the top to the bottom of the furnace body and the magnetic field are very uniform , which improves the energy conversion efficiency .The effect of the agitation force generated by the magnetic field on the bottom lining is also reduced.