Study Of Online Measuring Technique For Roller Wear Based On Optical Fiber Tiny Displacement Detecting

In 21st century the competitive focus of the world iron and steel industry is good quality and low cost of the product. And the main requests are precise size and right shape of the steel boards. After long time working, the surface of a roller will wear. So the shape of the roller will be changed. And the roller wear will result in difficult controlling the shape and the thickness of the board. Further more it can lead to the decline of the product quality of a rolling mill. So it is very urgent to detect the roller wear exactly and real time. Examining the profile of a working roller between the intervals of rolling is called online testing for roller wear. The study of online testing roller wear is very important for selecting the grinding time in reason; reducing the exchanging roller times, improving the quality of the product and realizing online grinding rollers. It has become one of the key technologies to improve the producing efficiency and economic benefits.Because of high sensitivity, stabilization and credibility, no electromagnetic interference and easily realized intelligent with the computer optical fiber sensor has get a broad attention by domestic and overseas investigators. In this paper, after summarizing the experience of the detecting methods inside and outside we carry on the theoretic and experimental studying of roller wear online detecting system based on optical fiber tiny displacement measurement. The main research contents are as follows:(1)Based on optical fiber tiny displacement measurement principle, the mechanism of converting roller wear to displacement for online precisely detecting was studied. The ration relation of roller wear and the distance between the probe and the roller surface was analyzed. Also the mathematics model of the system was set up.(2)The whole online optical fiber detecting system was designed. And the key technologies of the detecting system were studied. The optical fiber probe that can realize compensating automatically was designed. By using the technology of PSD and ratio disposal the light intensity stabilization can be ensured. Zero and temperature excursion can be restrained by using differential circuit. A three freedom of motion organ which can move along the radial axle and axial direction of the sensor were designed. By using programming software VC++6.0 the data collecting and processing system was designed.(3)Through analyzing the diversified factors which affect the precision of the detecting system, the principle of error separation and compensation was studied. The main contents are: working error of optical fiber sensor can be compensated by setting up reference channel; by using LSC the circular and rotator errors of the detected roller can be compensated; librations error can be compensated by using FIR digit filter based on Hamming window.(4)Based on artificial neural network and wavelet analysis, a new processing method for detecting data was found. So the sensitivity and measuring precision of the detecting system can be improved.(5)By using high speed data acquisition chip ADuC812, detecting data can be output in real time and accurately. And this can make the detecting system appropriate for working in rolling locale and detecting with high precision.(6)Experimental research and analysis have been completed. The main experiments include optical fiber sensor characteristics, the effect of the roller's states and ambience, and simulation of the analysis control software for the detecting system.