Working principle, maintenance and maintenance of induction coil of medium frequency furnace
| 1. Heating principle of medium frequency furnace coil: The medium frequency power frequency conversion device of the medium frequency furnace converts the three-phase 50Hz alternating current into a single medium frequency current of 100Hz-8000Hz after being rectified and inverted. After being input into the medium frequency furnace coil, a high-density magnetic field is generated. The magnetic field cuts the metal in the medium frequency furnace coil to generate eddy currents. And self-heating, to achieve the purpose of metal heating 2. Medium frequency furnace coil heating function: The function of the heating coil of the medium frequency furnace is to make the medium frequency current pass through the spiral induction coil of the medium frequency furnace to generate a magnetic field. The size and distribution range of the internal magnetic field of the medium frequency furnace coil are determined by the design of the induction coil, that is to say, the size of the rectangular copper tube of the medium frequency furnace heating coil , The number of turns and the diameter of the induction coil have a lot to do with. Third, the structure of the medium frequency furnace coil heating: The coil heating of the medium frequency furnace is made of a rectangular red copper tube according to the designed copper tube specifications, diameter and number of turns on the winding machine. The coil is welded with copper screws, and the copper screws are installed with bakelite posts with a certain distance between turns. Fix the distance between the turns of the coil and keep the shape of the heating coil of the medium frequency furnace unchanged. The coil is generally sprayed with insulating paint, wound mica tape, wound glass ribbon and insulating paint curing four to the insulation treatment, and then knotting the furnace lining to protect the coil, assisting the bottom support Fixed, stainless steel furnace mouth plate, peripheral bakelite board, waterway, vertical row and snap-on connection row, etc., to form a complete medium frequency furnace coil. Fourth, the classification of medium frequency furnace coil heating: The medium frequency furnace is divided into an medium frequency heating furnace and an medium frequency melting furnace, and its coils are also divided into an medium frequency furnace heating coil and an medium frequency furnace smelting coil; the medium frequency furnace heating coil is also called an inductor and a diathermic furnace coil, and the smelting coil is also called a smelting furnace Coil. 5. Specification of copper tube heated by coil of medium frequency furnace: Commonly used specifications of heating coil for medium frequency furnace are: 10×10×2mm 12×14×2mm 14×16×2mm 16×18×2mm 18×20×2mm 20×10×2mm 22×18×2mm 24×15×2mm 25×20×2mm 26×20 ×2mm Sixth, the use of medium frequency furnace coil heating: 1. The heating coil of the medium frequency furnace is used in a poor environment, especially in the foundry and melting workshop, where there is a lot of dust or iron filings. Since iron filings or iron scum are easy to fall on the medium frequency furnace coil, this will cause the interturn wood surface of the medium frequency furnace coil to be carbonized. In the case of a short circuit between turns of the medium frequency furnace coil, inter-turn ignition occurs, which will break down the copper tube of the medium frequency furnace coil and cause an medium frequency furnace failure. Therefore, it is necessary to frequently clean the use site of the medium frequency furnace, focusing on the medium frequency furnace wire to the medium frequency furnace coil. 2. When we inspect and repair the heating coil water circuit of the medium frequency furnace, we must pay attention to the direction of the cooling water inlet and outlet of the medium frequency furnace coil. The correct direction of the cooling water is downward and upward to avoid the waterway. In this way, it is necessary to pay attention to the water flow rate when charging the coil of the medium frequency furnace, so as to ensure the cooling effect of the coil of the medium frequency furnace. 3. Regardless of whether the medium frequency furnace is used for diathermy or smelting, pay attention to the use of the furnace lining. If the lining of the medium frequency heating furnace is broken, the metal oxide scale will fall on the coil, causing a short circuit between turns. The lining of the medium frequency smelting furnace is broken and thinner, and the molten steel flows through the lining and flows to the induction coil). In this case, the high temperature molten iron will burn the induction coil of the medium frequency furnace. Therefore, it is necessary to check the lining material of the medium frequency furnace frequently to avoid damage to the lining caused by rapid cooling and heating. |
|
