Water Cooling Cable Maintenance

The water-cooled cable is the name of the intermediate frequency furnace connecting cable. It is mainly used to connect the capacitor bank and the heating coil. Since the resonant current of the intermediate frequency furnace is 10 times larger than the input current, the current passing through the cable is too large and the heat generation is too high. The cable is obviously uneconomical and unreasonable, so water is needed to cool this cable, which is a water-cooled cable.

1. Water-cooled cable structure:

The electrode of the water-cooled cable is made of an integral copper rod by turning and milling, and the surface is passivated or tinned; the wire of the water-cooled cable is made of enameled wire and woven by a CNC winding machine, with high flexibility and small bending radius; the outer sheath is used Synthetic rubber tube with reinforced interlayer, high pressure resistance. The sleeve and the electrode are cold-extruded and fastened on the equipment with copper clamps, which has good sealing performance and is not easy to leak.

Water-cooled cable maintenance matters:

1. The outer rubber tube of the water-cooled cable adopts a pressure rubber tube with a pressure resistance of 5 kg, and cooling water is passed through it. It is a part of the load circuit. It is subjected to tension and torsion during operation, and tilts together with the furnace body to cause twists and turns. Therefore, after a long working time Easily broken at flexible joints. Once broken, it will be difficult to start the intermediate frequency furnace, and sometimes it can be started normally, but during the process of increasing the power, the overcurrent protection will act.

Treatment method: Due to the high current density of the water-cooled cable on the intermediate frequency furnace, it is easy to break once it is short of water, and the circuit will be connected after the break, so it is not easy to use the instrument to detect. Shake up the intermediate frequency furnace, measure with a small resistance gear or replace the new water cable.

2. Because the water-cooled cable tilts together with the furnace body, it repeatedly bends, so it is easy to break the core. When confirming that the cable is broken, first disconnect the water-cooled cable from the output copper bar of the electric heating capacitor. After the core of the water-cooled cable is broken, the intermediate frequency power supply cannot start to work.

Processing method: oscilloscope can be used when testing. Connect the oscilloscope clips to both ends of the load, and there is no damped oscillation waveform when the start button is pressed. When it is determined that the cable is broken, first disconnect the flexible cable from the output copper bar of the intermediate frequency compensation capacitor, and measure the cable resistance with the RX1 gear of the multimeter. R is zero when continuous, and infinite when disconnected

3. The process of burning out the water-cooled cable is generally to cut off most of it first and then quickly burn off the unbroken part during high-power operation. At this time, the intermediate frequency power supply will generate a high overvoltage. If the overvoltage protection is unreliable , it will burn out the thyristor. After the water cooling cable is disconnected, the intermediate frequency power supply cannot start to work. If you do not check the cause and start repeatedly, it is likely to burn out the intermediate frequency voltage transformer.

Treatment method: Use an oscilloscope to check the fault, clamp the oscilloscope probe at both ends of the load, and observe whether there is an attenuation waveform when the start button is pressed.