Maintenance of main components of intermediate frequency melting furnace
Repair of main component coil of intermediate frequency melting furnace
In the maintenance of the intermediate frequency melting furnace , the fault of the DC smoothing reactor coil is a fault that is difficult to judge and handle. The faults that occur in DC smoothing reactors are:
(1) IF furnace maintenance-free re-gap reactor and the number of coil turns, changing the inductance of the reactor, affecting the power filter reactor, enables the direct current output occurs intermittent phenomenon, guide
The inverter bridge works unstablely, and the inverter ignites the inverter thyristor and adjusts the air gap of the small reactor and reduces the number of coil turns. When the inverter bridge is short-circuited, it will reduce the blocking current of the reactor.
The ability to rise, burning the thyristor to change the inductance of the reactor at will also affect the starting performance of the intermediate frequency power supply ;
(2) The intermediate frequency furnace maintenance reactor coil is loose. If the coil of the reactor is loose, when the electromagnetic force causes the coil jitter coil to vibrate when the intermediate frequency power supply is working, the sudden change of inductance is easy during light load starting and small current running.
Cause the inverter to fail;
(3) The insulation of the intermediate frequency furnace repair reactor coil is not good. Short circuit to ground or short circuit between turns, sparking discharge causes inductance of the reactor, sudden jump and strong electromagnetic interference make the intermediate frequency power supply unstable and produce abnormal sound and audio
The reason that the over-current burnt thyristor causes the insulation of the coil insulation layer to be short-circuited is: a. The cooling is not good, the temperature is too high, and the insulation of the insulation layer is deteriorated and sparked; b. The reactor coil is loose,
Between the coil insulation layer and the coil insulation layer, between the coil insulation layer and the core, the relative movement friction causes the insulation layer to be damaged; c. When the reactor coil scale is treated, the acid solution is infiltrated into the line
In the circle, the acid corrodes the copper tube and forms a copper salt to destroy the insulating layer.
