THREE-PARAMETER METHOD FOR CONTROLLING DETAILS OF EQUIPMENT IN PROCESSING AND FOOD INDUSTRIES

Abstract

Based on the dependences of the normalized characteristics on the informative parameters of the product, which include the cross-sectional area of the plate S, the magnetic permeability μ, the resistivity ρ of the flat sample σ and the frequency, amplitude and phase components of the multi-parameter signal, a universal three-parameter method for joint measurement control of magnetic, electrical and temperature parameters of weakly ferromagnetic and ferromagnetic flat products of processing and food production equipment has been developed. The TEP switching schemes that implement the proposed universal method for joint measurement control of the parameters of flat products, which involve heating of the plates during the control process, are described. The essence of the proposed three-parameter method is based on the analysis of the interaction of the external magnetic field with the magnetic field of eddy currents, which are induced by the exciting coil in the controlled flat product. In this case, the normalized specific magnetic flux Kt induces the EMF of the thermal TEP in the flat sample. Further, based on the experimental data of the determination of the components of the converter signals and the obtained calculation data related to the determination of the normalized parameters of the TEP, the algorithms of the measuring and calculation procedures were established. Thus, by measuring the magnetic fluxes: Фt in a flat sample, the reference magnetic flux Ф0 and the phase shift angle, it is possible to obtain data on the relative magnetic permeability µ, the electrical resistivity ρ and the temperature t. In this case, any change in the parameters µ, ρ and t leads to a change in the generalized parameter x, and therefore, to a change in the amplitude and phase components of the TEP signals with the sample.