Luoyang Judian Metal Hot Processing Equipment Co., LTD is mainly engaged in the manufacture of complete sets of equipment in the metal thermal processing industry and the integration of the entire production line.
The induction coil is the heating element of the entire furnace, and the rated power of each induction coil can be as high as 700~800 kilowatts. In order to increase the power, two or more induction coils can be installed in the same furnace. When these induction coils are used for melting or heat preservation, double-slot induction coils with rated powers of 1.1, 1.5 and 2 megawatts are more suitable, which can be determined by the manufacturer.
In order to form a whole, two single-slot induction coils are connected together with a common central slot. Induction coil elements, the coil is wound on a laminated sheet core composed of directional transformer steel plates. The induction coil can be cooled by air or water according to the manufacturer's conditions and the state of the molten metal.
Induction coils for sale
In order to prevent the heat from the slot from being transferred to the induction coil, a split metal shield is inserted between the induction coil and the furnace lining. Air cooling can be used for smelting low-melting-point metals, while water cooling is required for smelting ferrous metals. This allows the furnace lining to be made thinner, increasing thermal and electrical efficiency, and also acts as a "freeze" barrier when there is a slight leak in the lining.
The factory-made inductors are bolted directly to the frame, and special attention should be paid to prevent leaks at the joints. Spare induction coils are usually available on site. Currently, designers and users have been able to successfully replace induction coils while the furnace is hot or even full. However, there are many practical problems with this, and the usual practice is to use another furnace to work while the damaged induction coil is replaced.
The induction coil assembly uses a liner made of neutral material rammed or cast refractory or cast basic refractory. The liner is dried by induction heating before installation in the furnace. When the furnace is first melted and started, the trough can be sintered with the help of a hollow steel model. For a 200 kW induction coil, approximately 700 kg of lining material is used, while for an 1,100 kW induction coil, approximately 3 tons of lining material is used.
The temperature of the molten metal in the tank is 100~150℃ higher than that in the furnace. The lining material is the main condition that limits the different operating temperatures. Al.O: and MgO basic lining materials have recently been successfully used in furnaces of various powers. The axial length of the tank must be increased as much as possible and the radial distance between the induction coil and the tank must be minimized to keep the reactance value of the induction coil at the lowest value. A high reactance value means a large iron core, a large induction coil and a low power factor; the power factor is generally between 0.5 and 0.7 lagging. The cross-sectional area and shape of the tank dominate the effective power. The radial distance from the induction coil to the tank can be determined based on the heat flow and the life of the furnace lining. Cooling water jackets can be used on thinner walls. As described in the article, the charge must be grounded to facilitate the measurement of the amount of electricity for underground leakage. In addition, in the tank induction furnace, a spliced metal shielding plate is used to ensure that the furnace will not short-circuit when the molten metal leaks. Monitoring the reactance of the furnace lining also provides a more precise indication of the operation of the induction coil.
When melting ferrous materials, the induction coil frame is cooled by water. It must be circulating and separated from the cooling of the circuit. The frame must be very strong to support the relatively weak refractory material.
For melting ferrous metals, the average life of the induction coil is 9 months, and an expected service life of one year is reasonable.
Open trough induction furnaces have been built and are widely used in Italy for iron melting.
Trough induction furnaces are widely used for non-ferrous metal melting, and induction furnaces with lower induction coil power ratings such as 20 kW have been used for zinc and aluminum melting, and can also be used as holding furnaces for die casting. When melting aluminum, it is important to provide means for cleaning and removing the slag accumulated in the trough, and the slag must be cleaned every 5 to 6 hours.
Ajax-Weiart iron core induction furnaces with V-shaped induction coils have been successfully used in the brass industry. At lower melting temperatures, it is possible to use dry induction coils, which can be cooled with air. Trough induction furnaces can be used for casting to obtain gas-free metal of consistent quality and specifications, which is very low in the production of thin-walled castings.
