How to knot the lining of an induction heating furnace?

1. The composition of the lining material of the induction heating furnace: usually composed of quartz sand. The thickness of the furnace lining can be reduced, the electrical efficiency can be improved, and the overall efficiency can be high. A very important factor for the low energy consumption of small diameters is that the thickness of the furnace lining cannot be made very thin. When heating workpieces of different diameters in the same induction furnace, the energy consumption is always low when the diameter is large, and the energy consumption is high when the diameter is small. . This induction heating furnace lining has the characteristics of excellent construction performance, high strength, anti-cracking, high fluidity and high wear resistance.

2. The lining of the induction heating furnace is suitable for forging heating, metal quenching and tempering heating and stamping heating of the diathermy furnace. The applicable temperature is 1300-1400 ° C. It can be used for 3–8 months for one pouring and knotting, which effectively improves the induction heating furnace. Service life, reduce furnace cost. Because the casting furnace lining is mainly used for the direct contact with the round steel heating, it is required that the granular and powdery materials must have high volume stability, compactness and corrosion resistance, and the induction heating furnace should also have insulation.

3. The lining of the induction heating furnace should be prevented from falling and cracking during use. The reason for the cracking is that the raw materials are not good enough. The lining material is generally refractory cement. Once the cement absorbs moisture, it will be formed into powder, and it will fall off in pieces. The process is not in place. , Refractory cement is similar to ordinary building cement. It needs to be maintained and the time cannot be less. This maintenance is maintenance in a humid environment. The maintenance time is about 48 hours. Dry and no-bake two methods. In order to have a long service life of the furnace, the drying of the furnace lining is very important. The core is slow drying. When drying at a low temperature for a long time of 36h, the initial temperature rise should be very slow.

4. The lining of the induction heating furnace uses high wear-resistant corundum-based casting construction refractories; this type of material uses high-purity corundum as the main material and through reasonable particle size grading, the material has the characteristics of high fluidity, suitable construction, and high volume. The advantages of stability; short baking time, high strength, good wear resistance, no cracking, and long service life can be easily used in and around various coil turns.

This high-performance unshaped induction heating furnace pouring knotting material, when used, add quantitative water to stir evenly and pour it directly into the induction heating furnace. The induction coil equipment forms a solid whole with the coil. , high strength, wear resistance, excellent flow performance, long service life and other significant characteristics, widely used in induction heating furnaces, intermediate frequency heating furnaces, induction heating furnace linings.

5. The selection of the binding agent when the induction heating furnace is knotted should be appropriate, some do not use the binding agent, and some only add a small amount of flux. Acid ramming materials are commonly used as binders such as sodium silicate, ethyl silicate, silica gel, etc. Among them, dry ramming materials use borate; alkaline ramming materials commonly use magnesium chloride and sulfate; Higher carbon can form carbon-bonded organics and temporary binders at high temperatures. The dry ramming material is added with an appropriate amount of iron-containing flux. Chromium ramming materials are commonly used as mango pins.

6. After the lining of the induction heating furnace is knotted, the newly-made inductor that is put into production must be baked at low power (usually about 30KW) after being powered on, and the heating workpiece should be placed in the induction heating furnace for 2 hours. about. The reason is that the induction heating furnace manufacturer must pass water in the sensor during the debugging process. After the debugging, there must be residual water in the copper tube of the sensor. Especially in winter, very thin ice may form. So, the sensor must be wet. In order to ensure the service life of the furnace lining, the newly put into production of the inductor must be baked at low power, and then start production at high power after 2 hours.

7. There are basically two types of furnace lining assembly forms for induction heating furnace inductors, one is knotted furnace lining, and the other is assembled furnace lining. What we are mainly talking about here is the knotted furnace lining, but whether it is a knotted furnace lining or an assembled furnace lining, it will change when working at high temperature for a long time (mainly thermal expansion and cold contraction and oxidation). If used improperly, the phenomenon of heating material collision and extrusion furnace lining will also occur. Therefore, the use of the furnace lining has a certain period of time. This mainly depends on the situation during use.

8. When the lining of the induction heating furnace is in use, once a crack occurs, if the lining is knotted, the crack must be filled with knotting material in time if the crack does not exceed 2mm. If the crack exceeds 2mm, the lining must be re-knotted; if it is an assembled lining must be replaced. Therefore, the user must take necessary measures according to the actual situation, and must not act rashly, causing unnecessary consequences and burning out the sensor.

During the heating process of the induction heating furnace sensor, a lot of oxide skin that falls off from the heated workpiece will accumulate in the sensor. If the furnace lining is damaged, or there are cracks or cracks, if it is not cleaned in time, it is easy to catch fire, resulting in overcurrent protection of the intermediate frequency power supply, and second, it is easy to break down the inductor coil and cause short circuit between turns of the inductor. Therefore, the oxide scale in the induction furnace should be cleaned at least once every shift (8 hours).