Induction melting electric furnace knotting furnace building method

1. Before the induction  melting  furnace is knotted, first check whether the coil insulation clay is intact. If the damage is serious, it should be repaired. The use of insulation clay plays an important role in the safe operation of the induction melting  furnace, mainly in the following aspects:

(1) After drying, the coil insulating cement layer with a thickness of 8mm ~ 15mm has good insulation performance and acts as an insulating protective layer between the coil and the lining; the thermal conductivity of the cement material is high, and there is no need to worry about the relatively thick cement layer. Hot surface lining.

(2) The rubber layer is located between the coil and the insulation layer. Under normal circumstances, the ambient temperature is very low (<300 °C). Occasionally, when the molten metal approaches the surface, the cement layer will release a small amount of residual moisture, which will reduce the insulation resistance. Early warning.

(3) The use of the cement itself is higher than 1800 ° C refractoriness, when occasional metal liquid leaks to its surface, the cement can provide a protective barrier to the coil, when the alarm occurs, the cement layer can provide a certain accident handling time.

(4) The rubber layer has a long service life and can be used repeatedly. The coil protection of the furnace is reliable, and at the same time, partial repair can be performed, thereby reducing the cost of building the furnace as a whole.

2. Asbestos board and asbestos cloth are laid in the intermediate frequency electric furnace. The joint width of asbestos board and asbestos cloth joint is 30mm ~ 40mm, the laying layer should be close to the furnace wall, and the upper and lower layers of the expansion ring are fixed at the same time. The installation position of the expansion ring can be determined according to the specific situation.

3. The use of building materials for medium frequency electric furnaces.

(1) If the quartz sand prepared by the factory is used, the furnace is built strictly according to the requirements of the factory, and the amount of boric acid is determined, and the furnace mouth, furnace wall and furnace bottom are built.

(2)self-dosing. The choice of building materials. It should be noted that not all quartz sand with SiO2 ≥99% can be used as the lining material of the induction furnace. The important thing is the size of the quartz crystal. The coarser the crystal grains, the less the lattice defects are (for example, the purity of crystalline quartz sand SiO2 is high. The appearance is white and transparent. The larger the furnace capacity, the higher the requirement for the grain.

Hand selection, mainly to remove blocks and other impurities; magnetic separation, must completely remove magnetic impurities. The ramming material must be slowly dried, and the drying temperature is 200 ° C ~ 300 ° C, and the temperature is kept for more than 4 hours. The choice of binder: using boric acid as a binder, the amount of addition is 1.5% to 2%; the amount of water glass outside the furnace mouth is 5% to 6%.