The working temperature of the molten metal core of the induction melting furnace can reach up to 1600°C, which is high-risk equipment. Once the equipment, especially the steel shell furnace body, fails, it may cause major accidents. Therefore, it is of great significance to do a good job in the maintenance of the induction furnace from the details, and to understand the basic safety protection knowledge of the foundry melting furnace.
The common accidents of the furnace body of the crucible induction furnace include furnace leakage and furnace wear. If an accident occurs, if no measures are taken, it will cause the copper tube of the coil to rupture, the molten iron and the coolant will explode, which will cause major equipment accidents or personal injuries. Therefore, it is very important to clarify the cause of the accident, preventive measures and emergency measures after the accident.
1. Reasons for furnace leakage and furnace wear accidents
(1) The molten iron cools for too long and the lid is formed. It expands when heated again, and the lining is extruded to cause cracks in the lining. During the melting process, the molten iron penetrates through the cracks, causing the furnace to be worn or sprayed from the lid, causing a furnace injection accident.
(2) As the furnace age increases, the volume of the furnace lining becomes larger, the amount of molten iron in the furnace increases, the furnace lining is thinner, and the furnace cannot withstand the pressure of the molten iron locally, causing the furnace to wear.
(3) When the furnace lining is knotted, it partially fails to meet the requirements or partially brings in impurities and is not found, causing the above-mentioned defects to be penetrated during smelting.
(4) The rapid cooling of the furnace lining produces cracks, which penetrate through the cracks during the smelting process.
2. Preventive measures
(1) From the beginning of the furnace construction, a dedicated person must be strictly managed to ensure that the knots of each furnace lining are consistent. It is forbidden for sundries to fall into the furnace lining when knotting.
(2) Before each feeding, observe whether there are cracks in the furnace lining, perforation, etc., which may cause the furnace to penetrate. Once there is a problem, it must be dealt with.
(3) During the smelting process, due to equipment failure or other factors, the furnace cannot be opened for smelting for a long time, the molten iron should be turned out of the furnace to prevent cap formation.
During the smelting process, if the furnace body of the induction furnace has a furnace leak, it will cause heavy losses. Not only the entire furnace steel (iron) water will be scrapped, but the heart (inductor) of the furnace body will also be burned or even scrapped, and personal accidents may also occur. Therefore, in order to avoid unnecessary losses and affect production, it is very important to avoid furnace leakage when using induction melting furnaces. Generally speaking, the device leakage detection and alarm device is a necessary measure to ensure the safe operation of inductotherm induction furnaces and avoid the expansion of the incident.
Now, there is a way to install a stainless steel sheet (or disposable stainless steel wire mesh) on the inner side of the induction coil as the second electrode. The claws made of 6 to 7 stainless steel wires touch the liquid metal as the top electrode. If the molten metal penetrates the furnace lining and touches the stainless steel sheet (or stainless steel wire mesh), the leak detection alarm device will announce the leak alarm.
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