Induction furnace is a kind of induction furnace which can convert the power frequency of 50 Hz AC to medium frequency (300 Hz to 20 K) The three-phase power frequency alternating current is converted into direct current after rectification, and then the direct current is converted into adjustable intermediate frequency current to supply the intermediate frequency alternating current flowing through the capacitor and induction coil. High density magnetic lines of force are generated in the induction coil, and the metal materials in the induction coil are cut to produce large eddy current in the metal materials. This kind of eddy current also has some properties of intermediate frequency current, that is, the free electrons of metal flow in the metal body with resistance to generate heat. For example, if a metal cylinder is placed in an induction coil with alternating medium frequency current, the metal cylinder does not directly contact with the induction coil, and the temperature of the coil itself is very low, but the surface of the cylinder is heated to reddening or even melting, and the reddening and melting speed can be achieved by adjusting the frequency and the current strength. If the cylinder is placed in the center of the coil, the temperature around the cylinder is the same, and the heating and melting of the cylinder do not produce harmful gas and strong light pollution.
Induction furnace is widely used for metal smelting, mainly used for smelting ferrous materials such as steel, alloy steel, special steel, cast iron, stainless steel, zinc and other non-ferrous materials, as well as copper, aluminum and other non-ferrous metals melting, heating and heat preservation, and can be used for double operation with blast furnace. Forging heating 〔 used for bar, round steel, square steel, steel plate diathermy, temperature supplement, blue quenching, blanking, on-line heating, local heating, on-line forging of metal materials (such as gear, half shaft connecting rod, bearing, etc.), extrusion, hot rolling, heating before shearing, spraying heating, hot assembly, quenching and tempering of metal materials as a whole, etc. Quenching and tempering heat treatment (mainly for shaft (straight shaft, variable diameter shaft, camshaft, crankshaft, gear shaft, etc.); gear; sleeve, ring, plate; machine screw; guide rail; plane; ball head; hardware tools and other mechanical (automobile, motorcycle) parts surface heat treatment and metal material overall quenching and tempering, annealing, tempering, etc.).
The induction smelting furnace is composed of four main parts: furnace shell, induction coil, furnace lining and tilting speed reducer. The induction coil is a spiral cylinder made of rectangular hollow copper tube, and cooling water is supplied in the tube during smelting. The copper bar led out from the coil is connected with the water cooling cable, the furnace lining is close to the induction coil, and is made of quartz sand by compaction and sintering. The tilting of the furnace body is caused by tilting, and the furnace reducer rotates directly. Tilting furnace reducer is a two-stage variable-speed, with good self-locking, stable and reliable rotation. In case of emergency breakpoint, it can manually tilt the furnace to avoid danger. The control of tilting furnace reducer motor of two furnace bodies can be selected through the furnace selection switch. The switch box with four core rubber wire can make the operator stand at the appropriate position to control the tilting and reset of furnace body.