The intermediate frequency melting furnace water cooling cable uses the water cooling cable to solve the large current transmission of the melting furnace. It is installed between the capacitor bank and the induction coil to ensure the normal transmission of the variable frequency current and make the intermediate frequency melting furnace operate normally. if
If there is a problem with the water-cooled cable of the smelting furnace, the following faults will occur:
I. The water-cooled cable of the intermediate frequency melting furnace is a part of the load circuit of the melting furnace because it is connected to the induction coil of the intermediate frequency melting furnace. The cable is subjected to tension and torsion, and the furnace body tilts and bends, resulting in fatigue fracture. In the process of water-cooled cable breakage, generally first break off most of it, and then burn off the unbroken part quickly during high-power operation. At this time, the intermediate frequency power supply will generate a high overvoltage. If the overvoltage protection is not reliable, the It will burn out the thyristor. After the water cooling cable is disconnected, the intermediate frequency power supply cannot start to work. Since the water-cooled cable is at risk of breakage, it is necessary to regularly check whether the water-cooled cable has a harbinger of breakage. You can disconnect the water-cooled cable from the output copper bar of the electric heating capacitor, and measure the resistance value of the cable with a multimeter electrical block (200Q block). The resistance value is normal. zero, and infinity when disconnected. When measuring with a multimeter, the furnace body should be turned over to the dumping position, and the water-cooled cable should be dropped, so that the broken part can be completely separated, so as to correctly judge whether the core is broken.
2. The leakage of the water-cooled cable of the intermediate frequency melting furnace is easy to distinguish. You can observe whether there are traces of water seepage on the contact surface of the water-cooled cable forehead hoop and water nozzle, and observe whether the water-cooled cable hose of the intermediate frequency smelting furnace has cracked marks, or the hose is burned out due to the induction heating caused by metal objects such as iron filings touching the hose. If there is any damage, immediately Replace the hose.
3. Whether the connection of the water-cooled cable of the intermediate frequency melting furnace is loose, especially the connecting bolts, must be tightened and not loosened to cause virtual connection, which will cause damage to the intermediate frequency power thyristor.
4. Check whether the water path of the water-cooled cable of the intermediate frequency melting furnace is unobstructed to ensure that the circulating cooling is normal. Due to the frequent blockage of the water circuit, the cooling effect is reduced, and the temperature of the water-cooled cable of the intermediate frequency melting furnace increases and the cable is burned out. When checking the water-cooled cables of the intermediate frequency melting furnace, the flow rate of the waterway should be observed, and the waterway cooling should not be judged only by the high water pressure of the cooling waterway.