Research Of Real-time Monitoring System Of Rolled Wire Rods On Stelmor Line

Our country’s production of wire reached 13,616 million tons in 2014, more than 33% of the world’s total output wire, has become the world’s largest country of wire production, but we are not the nation that have the best quality of wire in the world. Due to the different applications of wire, the requirement of wire’s quality is increasingly high, including wire’s material homogeneity, uniformity of internal tension, fatigue resistance etc. There is a certain gap between our country and the industrialized countries in the world of wire’s quality, sophisticated high-wire still need to rely on imports, consume large amounts of foreign exchange.The emphasis of improving the quality of wire is controlling the cooling phase, Stelmor cooling line is now the most widely used and most efficient method of cooling wire, it does this by controlling the temperature drop of wire cooling process to ensure the stability of metallurgical changes inside wire, has important implications to the finished wire’s internal organization, mechanical properties and secondary oxidation. But the method that measure the temperature change of the entire cooling process has been empirical determination, it can’t obtain the information of temperature distribution that caused by scattered volumes’ overlapping, uneven distribution of cooling air damper and etc. We didn’t have such sophisticated equipment for precise temperature monitoring, so it’s difficult to ensure the metallurgical changes inside of the wire in consistency.On this basis, this paper proposes to develop a specialty monitoring products that can both watching and real-time detecting temperature of scattered rolling coil based on infrared image information and the theory of spectral analysis. By infrared thermal imaging technology to measure the temperature of the full range of scattered rolling coil, we can obtain the temperature data along the running direction of it, achieve the visualization of the temperature distribution and visual display the metallurgical phase transition point. Through these, we can verify the effectiveness of controlled cooling and improve the existing systems.The thesis includes the following several contents:1. Derive the basic formula of the dual-wavelength colorimetric temperature method and the apparatus correction factor K step by step starting from the basic principle of infrared temperature measurement- Planck’s radiation law;2. Design the principle of the system equipment, analysis the effect of filed environment to the selected wavelength that using for temperature measuring, select the optimal wavelength, calculate of the atmospheric infrared radiation and other factors affecting the measurement. Optimize the design of the optics to provide higher energy efficiency;3. Design site software processes, the use of the camera capture synchronization function and program and compile other software modules;4. Testing the finished devices with the blackbody furnace and calibrating parameters, like exposure time, synchronization correction, apparatus correction factor K;5. To extract the image information more clearly, we using histogram filtering, edge detection and other operations to the acquisition image data, and correcting the correspondence between the two cameras, finding the relationship between the two images.6. Finally, we show the experimental results of the online operation and analysis the error.