Temperature measuring device for plate glass furnaces
OLED HD display technology is more complex, and the quality of the carrier glass is very high, so the production and manufacturing process of the carrier glass needs very high capacity. The melting temperature of compound plays a very important role in the melting process of plate glass. It not only affects the energy usage in the melting process, but also affects the quality of liquid glass.
The carrier glass belongs to the high aluminum alkali free glass, its characteristic is that the softening point is up to 1650℃(the most appropriate temperature is 1700℃). Because the deviation of load plate glass for furnace temperature should be in the range of ±2℃, so for the method of temperature measurement, the deviation of temperature measurement device, material requirements are particularly high. In the general production process, the internal temperature of furnace is measured by infrared radiation and thermocouple. The infrared imager is limited by its own measurement deviation, which far exceeds the requirement of temperature deviation of the carrier glass liquid. For the temperature measurement of plate glass liquid glass, because the temperature of the glass liquid in the furnace can reach 1700℃, the service life of the thermocouple is greatly reduced at such high temperature. If the terminal post of the thermocouple element is often exposed at the high temperature of 1000℃, it is easy to increase the resistivity due to the generation of oxides, which seriously affects the feedback result and causes the distortion of temperature measurement.
To avoid this phenomenon, it is usually necessary to remove the oxide on the thermocouple terminal to achieve the accuracy of the signal transmission of the thermocouple. But this method of removal is dangerous, difficult and inefficient. So many high temperature furnace temperature measuring device use infrared temperature measurement, but in the production due to smoke, gas and other factors will produce attenuation of infrared. The volatiles and oxide coating in the furnace will also change the infrared radiation coefficient and reduce the accuracy of infrared temperature measurement.
The light emitted by infrared thermometer reaches the lens through the Angle adjusting compensator, and then shines on the detected object tungsten block through the lens. The glass liquid contact block is tungsten block. The temperature and temperature change of the tungsten block are detected, and the temperature and temperature change inside the furnace are indirectly detected and recorded. The indirect monitoring method can accurately and long-term monitor the temperature of the glass liquid on the carrier plate, which eliminates the problem of inaccurate temperature measurement caused by the material of the temperature measuring element can not withstand high temperature or the substance such as soot and slag covering the monitoring element. Tungsten block has good thermal conductivity, which can quickly guide the temperature of glass liquid in the furnace from one side of the tungsten block to the other side for infrared thermometer measurement and recording. The light emitted by the infrared thermometer reaches the lens through the Angle adjustment compensator, and then shines on the detected object tungsten block through the lens to detect the temperature and temperature change of the tungsten block, so as to indirectly detect the temperature and temperature change of the glass furnace and record.
We can produce tungsten block according to customer's requirement.
