| In the normal smelting process of submerged arc furnace(SAF),complex physical and chemical reactions occur in the furnace,and strong electric current is introduced into the SAF through the electrode.The position of the electrode tip affects the arc length,and then affects the temperature and the chemical reaction speed in the furnace.Therefore,the electrode penetration needs to be controlled within a certain range,and should not be too deep or too shallow.Because the electrode current is very strong,even if there is the metal shielding effect of the furnace wall,there will be a magnetic field which reflects the size and direction of the current in the SAF.Therefore,the key parameters such as the electrode tip can be obtained by analyzing the distribution of the magnetic field information,which has important practical significance and broad application prospect in stabilizing the furnace condition,improving the process,reducing energy consumption,reducing accidents and increasing economic benefits in the process of SAF.A detector for the path tangent direction of AC magnetic field flow is designed in this study.The detector can analyze the path tangent direction according to the magnetic field component measured by the probe during two revolutions.Firstly,the probe was rotated 180 degrees around the azimuth axis to detect the position of the maximum value of the magnetic field component in this process and secondly,rotated 180 degrees in this position around the pitch axis to detect the position of the maximum value of the magnetic field component,then in this position the path tangent direction of AC magnetic field flow was indicated finally by an indicating rod.In this paper,the main work is as follows:(1)The working principle of the detector is researched.Firstly,based on the structure and the magnetic field distribution model of the furnace,the concept of the path tangent direction of magnetic field flow is derived,and then the mathematical model of the detector is discussed,and the principle of determining the path tangent direction of magnetic field flow is analyzed.Through the two rotation,the three-dimensional space problem is transformed into two dimensional plane.Then,the structure of the detector is designed to lay the foundation for the realization of the object and function.(2)The system construction and function module development of the detector are introduced.Firstly,from the two aspects of the construction of mechanical parts and the design and implementation of control system,the general structure of the detector system is expounded,and the related software for engineering implementation is introduced briefly.Then,the design and implementation of each function module of the detector are described in detail from the two aspects of the basic function development and the control interface design,which paves the way for the integrated test of the detector system.(3)The system integration test of the detector is carried out.Firstly,the output signal of the knob potentiometer is used as the test signal,and it is verified that under the excitation of the signal the detector system can realize the expected functions.Then,in the AC magnetic field environment,the system integration test of the detector is carried out,and it is proved that the detector system can realize the indication of the path tangent direction of AC magnetic field flow,and realize the functions of leveling,starting,storing,resetting and reappearance,thus achieving the desired goal. |
