The electric Induction furnace is a power supply device that converts 50HZ AC power into an intermediate frequency (above 300HZ to 1000HZ). It converts three-phase AC power after rectification into DC, and then converts the DC into an adjustable intermediate frequency current, which is supplied by a capacitor with the intermediate frequency alternating current flowing in the induction coil, high-density magnetic lines of force are generated in the induction coil, and the metal material contained in the induction coil is cut, and a large eddy current is generated in the metal material to achieve the purpose of heating.
The working principle of electric Induction furnace
The electric Induction furnace is mainly composed of a power supply, an induction coil and a crucible made of refractory materials in the induction coil. The crucible contains metal charge, which is equivalent to the secondary winding of the transformer. When the induction coil is connected to the AC power supply, an alternating magnetic field is generated in the induction coil. The magnetic field lines cut the metal charge in the crucible, and an induced electromotive force is generated in the charge. Since the charge itself forms a closed loop, the secondary winding is characterized by only one turn and is closed. Therefore, the induced current is generated in the charge at the same time, and when the induced current passes through the charge, the charge is heated to promote its melting.
The electric induction furnace uses an intermediate frequency power supply to establish an intermediate frequency magnetic field, which induces eddy currents and generates heat inside the ferromagnetic material, so as to achieve the purpose of heating the material. The intermediate frequency electric furnace uses a 200-2500Hz intermediate frequency power supply for induction heating, melting and heat preservation. The electric induction furnace is mainly used for smelting carbon steel, alloy steel, special steel, and can also be used for smelting and heating of non-ferrous metals such as copper and aluminum. The medium frequency furnace is small in size and weight, high efficiency, low power consumption, fast melting and heating, easy control of furnace temperature, and high production efficiency.
Smelting principle of electric Induction furnace
The electric Induction furnace control system adopts thyristor AC, digital DC power conversion non-theoretical relay control, with high reliability and high working frequency anti-interference, automatic tracking, and the workflow function without manual intervention, automatically matching the load and power supply. Due to the protection capabilities of overcurrent, overvoltage, lack of phase, and insufficient water pressure, the operation will not damage the components in the event of any failure of the equipment, which reduces the use and maintenance costs of the Induction furnace. The temperature feedback system can be increased, and the closed-loop automatic adjustment system for the temperature composition: increases the separation temperature of the attached machine to achieve the temperature at which only forged qualified workpieces are sent. In addition, industrial machinery control and heating systems are used to realize intelligent control and intelligent temperature precision execution of smelting temperature controller control coupling.
The principle of electric Induction furnace steelmaking
Intermediate frequency furnace is a power supply device that converts 50Hz AC power at power frequency into an intermediate frequency (above 300Hz to 10000Hz), equipped with induction coils and compensation capacitors, and heating equipment using the principle of electromagnetic induction. The electric Induction furnace is widely used in smelting and heating of non-ferrous and ferrous metals, such as smelting pig iron, ordinary steel, stainless steel, tool steel, copper, aluminum, gold, silver and alloys, etc.; steel and copper parts for diathermy forging, aluminum ingots for extrusion, etc.; quenching and tempering of metals, Heat treatment such as quenching. The heating device of the intermediate frequency furnace has the advantages of small size, lightweight, high efficiency, excellent thermal processing quality and a favorable environment. It is rapidly eliminating coal-fired furnaces, gas furnaces, oil-fired furnaces and ordinary resistance furnaces. The induction furnace is a new generation of metal heating equipment.
What is the working principle of the thyristor in the inverter cabinet of the electric Induction furnace?
There are two types of thyristors: one-way thyristor and two-way thyristor, both of which have three electrodes. One-way thyristors have cathode (K), anode (A), and control electrode (G). The bidirectional thyristor is equivalent to two single-phase thyristors in reverse parallel connection. That is, one of the unidirectional silicon anodes is connected to the other cathode, and its leading end is called T2 pole, and one of the unidirectional silicon cathodes is connected to the other anode, and its leading end is called T2 pole. Extremely (G).
1. Discrimination of single and two-way thyristors: first measure two poles, if the positive and negative test pointers do not move (R×1 gear), it may be A, K or G, A pole (for one-way thyristor) ) It may also be T2, T1 or T2, G pole (for triac).
If one of the measurement instructions is tens to hundreds of ohms, it must be a one-way thyristor, and the red pen is connected to the K pole, the black pen is connected to the G pole, and the rest is the A pole. If the positive and negative test instructions are tens to hundreds of ohms, it must be a triac. Then turn the knob to R×1 or R×10 to repeat the test. One of them must have a larger resistance value, and the larger one is connected to the G pole, the black pen is connected to the T1 pole, and the rest is the T2 pole. .
2. The difference in performance: turn the knob to R×1, for 1~6A one-way SCR, the red pen is connected to the K pole, and the black pen is connected to the G and A poles at the same time, and the black pen does not depart from the A pole. When the G pole is disconnected, the pointer should indicate dozens of ohms to one hundred ohms. At this time, the SCR has been triggered, and the trigger voltage is low (or the trigger current is small). Then turn off the A pole momentarily and turn it on again, and the pointer should return to the ∞ position, indicating that the SCR is good.
For the 1~6A triac, the red pen is connected to the T1 pole, and the black pen is connected to the G and T2 poles at the same time. The G pole should be disconnected under the premise of ensuring that the black pen does not separate from the T2 pole. The pointer should indicate dozens to more than one hundred Europe (depending on the size of the thyristor current and different manufacturers). Then reverse the two pens and repeat the above steps to measure once. The pointer indicates that it is a little more than ten to several tens of ohms larger than the previous time, which indicates that the thyristor is good and the trigger voltage (or current) is small.
If the A pole or the T2 pole is kept on and the G pole is turned off, and the pointer immediately returns to the ∞ position, it means that the trigger current of the SCR is too large or damaged. For the one-way SCR, close the switch K, the light should be on, and the K light will not stop when the K is disconnected, otherwise the SCR is damaged. For the triac, close the switch K, the light should be on, and open the K, the light should go out continuously. Then reverse the battery and repeat the above steps. The results should be the same, which means it is good. Otherwise, the device has been damaged.
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