When maintaining and servicing medium-frequency furnaces, be sure to keep these key points in mind.
2021-03-02
Medium-frequency furnace maintenance should include a weekly or bi-weekly shutdown to thoroughly inspect all machine functions, ensuring you stay informed about the equipment's condition. Below are the daily tasks as well as the weekly or bi-weekly inspection steps. Implementing the correct maintenance practices will effectively extend the lifespan of your equipment—let’s explore them together!
Before starting the medium-frequency furnace each day, it is essential to confirm that both the power supply pump and the furnace body pump are turned on. The water pressure should be maintained at 1.5 to 1.7 kg/cm² in the power cabinet and 1.5 to 2 kg/cm² in the furnace body. To ensure optimal operation of the medium-frequency furnace, a temperature-measuring gun must be used daily to monitor the temperatures of the thyristors, as well as the operating temperatures of the RC snubber resistors and the equalizing resistors. The temperature measurement process is divided into three distinct stages:
First, measure the temperature about 5 to 10 minutes after starting the medium-frequency furnace with approximately one-third of its power—this is done during the initial melt of the first batch of molten steel. Next, take another temperature reading when the furnace is nearly full of steel. Finally, perform the third measurement at the very end of the melting process, when the furnace is running at full power for the last time today. Of course, all three temperature readings must be recorded promptly to help identify and address any potential issues as they arise. Before operating the medium-frequency furnace, always start the water pump 10 minutes in advance to check for leaks or water seepage. If any leaks are detected, take immediate action to prevent disruptions to production. Additionally, if you notice that the temperature of a resistor in the rectifier’s RC protection circuit differs significantly from the others, investigate right away—this could indicate an open capacitor or a faulty resistor. Typically, when the system is functioning properly, the reactor will produce a noticeable humming sound with a slight vibration upon startup.
If the medium-frequency furnace detects an abnormal thyristor temperature, it should immediately investigate the cause—whether the water pipe has bent, leading to insufficient water flow and overheating, or if there’s dirt buildup inside the thyristor housing causing blockage.
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