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　　 Medium-frequency electric furnace It is a power supply device that converts 50 Hz AC power into medium-frequency power (above 300 Hz up to 10,000 Hz), consisting of a furnace body, a frequency conversion unit, and furnace-front control systems.

　　 Medium-frequency electric furnace Principle: Based on the fundamental principle of electromagnetic induction, three-phase power-frequency AC is rectified and converted into DC, which is then transformed into an adjustable intermediate-frequency current. This current is supplied to a load consisting of capacitors and induction coils (the coils and capacitors can be connected either in parallel or in series). As the high-density magnetic flux lines generated by the induction coil cut through the metallic material within the coil, large eddy currents are induced in the metal. These eddy currents exhibit certain characteristics of intermediate-frequency currents: the free electrons within the metal itself flow through the resistive metal body, generating heat in the process. For example, if a metal cylinder is placed inside an AC intermediate-frequency current induction coil without direct contact with the coil, the temperature of the coil itself remains quite low. Yet, the surface of the cylinder heats up rapidly—reaching a red-hot state or even melting. The speed at which the cylinder turns red-hot and melts can be precisely controlled by adjusting the frequency and intensity of the current. Moreover, the temperature around the cylinder remains uniform. If the cylinder is positioned at the center of the coil, its heating and melting will not produce harmful gases or intense light pollution, making this process environmentally friendly.

　　Advantages of medium-frequency induction furnaces: 1. The central control circuit board is optimized by computer and features a highly integrated circuit combination, ensuring reliable quality, stable performance, and strong anti-interference capability. 2. The components of the medium-frequency induction furnace are easy to maintain and arranged in a coordinated and rational manner. 3. Building on zero-voltage startup, the furnace has been enhanced with automatic frequency sweeping and repeated startup functions. The voltage and current loops track each other closely, eliminating current surges and ensuring smooth equipment start-up and shutdown. 4. A single-signal, high-sensitivity trigger circuit is used as the inverter’s start-up signal, further improving the equipment’s starting performance and achieving a 100% success rate for equipment startups. 5. The constant-power circuit control system automatically adjusts the voltage and current to ideal setpoints quickly and seamlessly, without manual intervention, in response to changes in the charge material during production. 6. An advanced protection system includes comprehensive safeguards against overvoltage, overcurrent, undervoltage, water shortage, phase failure, and over/under voltage/current limits, ensuring the equipment’s reliability and operational stability. 7. The circuit design features a highly integrated architecture, making commissioning, operation, and troubleshooting fast, simple, and easy to learn.

　　 Medium-frequency electric furnace Heating devices offer advantages such as excellent thermal processing quality, high efficiency, light weight, compact size, and environmental friendliness. They represent a new generation of metal heating equipment and are rapidly replacing fuel furnaces, gas furnaces, coal-fired furnaces, and conventional resistance furnaces. Medium-frequency induction furnaces are the primary equipment in casting, forging, and heat-treatment workshops. Their reliability, stability, and safety are essential for ensuring the smooth and stable operation of continuous casting, forging, and heat-treatment production lines. Medium-frequency induction furnaces hold great promise for future development in the heat-treatment field, particularly in the production of pre-forging heating furnaces, through-heating furnaces, and induction heating systems used for processes including through-heating, rolling, forging, bending, heat treatment (quenching), and welding.