Technical characteristics and advantages of one-to-two medium frequency smelting furnace
The one-to-two medium frequency melting furnace, as its name implies, is a power supply with two furnaces working at the same time. The power is arbitrarily distributed. One is for smelting and the other is for heat preservation. Uninterrupted melting. When needed, it can be kept at an accurate temperature, heat up, temper, etc. Limit increase in production.
The one-to-two medium frequency furnace adopts the “series inverter type thyristor medium frequency power supply technology”. Although the thyristor fully controlled rectifier electric furnace is used, it does not use it for voltage regulation. It only uses it to achieve soft start and act as an electronic switch in the event of a fault to quickly cut off the power supply. , In normal operation, the thyristor is always in the fully-on state, so that the power supply of the grid has a high power factor and reduces harmonic interference. The rectifier control circuit adopts a digital shift trigger circuit. The digital shift trigger circuit has the advantages of good repeatability, good stability, good symmetry, strong anti-interference ability, and convenient debugging. If the digital quantity setting is used, it can still realize remote control.
First, high efficiency
The series inverter adopts a half-bridge circuit, the number of main circuit components is relatively reduced, and there is a high power factor, so it has a higher power.
Good starting characteristics, can be started at will under full load and heavy load, and the starting success rate is 100%. Improve the power factor to ensure that the power factor reaches 95% at any power.
Constant power output. The power output adopts constant control. During the smelting process, when the load and temperature change, the load is always full power output, thus shortening the smelting time.
Second, it has a complete protection and operating status monitoring system
For example, use sensors to obtain signals for incoming line current, voltage, channel current, and voltage, and provide double closed-loop digital circuits for current limiting, voltage limiting, excessive overvoltage repeated protection, water temperature and water pressure protection, and so on. Both KK SCR and KP SCR have self-turn-off time protection.
Third, there is a complete detection system
The working temperature of the inverter and filter capacitor is monitored by a temperature switch meter. Once the cooling water temperature exceeds the set value or there is a water circuit failure, an alarm will be issued and the power supply will be cut off. The power supply cooling water input has a water pressure relay electrical control, and the cooling water output has a temperature switch meter to monitor undervoltage, and an alarm will be issued and the power supply will be cut off if over temperature.
Our company’s latest thyristor series-connected one-to-two medium frequency power supply
- Use occasion: It is suitable for the occasions where two furnaces of molten steel need to be produced at the same time for casting relatively large workpieces. It is suitable for the working mode of one power supply and two furnace bodies working at the same time, one for smelting and the other for heat preservation. It is suitable for casting production line that requires continuous and uninterrupted tapping of molten steel to be compatible with the production rhythm of sand molds.
- Compared with the traditional parallel connection: it can work in a detuned state and adjust the output power through frequency modulation. In the event of any failure, the inverter thyristor will not be burnt. It can adapt to the working mode of heavy load start-up operation. The thyristor of the rectifier bridge is always in the fully-on state during the entire operation of the equipment, so the power factor of the entire smelting process is above 0.96. Improve overall operating efficiency and save operating costs. The resonant tank current is close to the DC current and is relatively small, so the loss on the overall line is relatively small, which improves the overall efficiency. The work caused by frequent replacement of water-cooled cables or furnace switch is eliminated, and the labor intensity of workers is reduced.