In on-site operation and maintenance, operators often encounter uneven temperatures on both sides of the furnace chamber, fluctuations in heating rate, or deviations between thermocouple readings and the actual workpiece temperature. Such problems are often related to the furnace body structure, heating element layout, and temperature control method. The following summarizes several common questions based on the daily use of the KJX-30-10 box-type electric heating furnace.
A: The heating elements of the KJX-30-10 are arranged on both sides and at the bottom of the furnace chamber, with the purpose of transferring heat from multiple directions toward the center. A single thermocouple usually reflects only the temperature at one fixed point in the furnace. For batch loading or cases where workpieces are placed asymmetrically, it is recommended to install monitoring points at different positions in the furnace chamber, or regularly calibrate the effective heating zone with a portable temperature measuring instrument. Maintenance personnel can combine the zone display of the temperature control instrument to observe the on-off status of the heating elements in each zone, so as to promptly detect aging or poor contact of elements on one side.
A: The KJX-30-10 can be equipped with resistance wire, resistance strip, or silicon carbide rods as heating elements. Resistance wire and resistance strip are prone to oxidation, thinning, or local short circuits under long-term high temperature. Daily inspection should observe whether their surfaces glow red evenly and whether there is sagging or overlapping. The resistance value of silicon carbide rods will increase after a period of use, and the output needs to be adjusted with a voltage regulator or thyristor power controller. When replacing, it is recommended to replace the entire set to avoid uneven power distribution caused by mixing old and new. Regardless of the type of element, after power-off, the furnace door should only be opened after the furnace temperature has dropped to a safe range.
A: It is recommended to record the deviation between the displayed value and the set value of the temperature control instrument every shift; check whether the furnace door sealing strip is intact to avoid heat leakage causing lower edge temperatures; observe whether the electrical wiring terminals are loose or discolored due to heat; and listen to whether the fan and contactor operate with normal sounds. If the heating time is found to be significantly prolonged, first check the power supply voltage, element resistance, and whether the furnace lining insulation layer is damp or damaged. Regularly cleaning oxide scale and debris in the furnace chamber helps maintain temperature uniformity.
A: The KJX-30-10 box-type electric heating furnace is an integral furnace chamber heating equipment, suitable for high-temperature experiments such as laboratory elemental analysis and determination, powder and ceramic sintering, and dissolution analysis. It can also be used for small-batch heat treatment, annealing, or preheating processes in industrial and mining enterprises. Compared with electric heating coils and electric heating plates, its advantage lies in the ability to process materials integrally and in batches, and to achieve a relatively stable heating curve with programmed temperature control. Before use, a reasonable upper temperature limit and holding time should be set according to the material characteristics to avoid overheating operation.
