Development of a Digital Angular Clearance Observer in Spindle Connections of the Main Rolling Cabinet
DOI:
https://doi.org/10.14529/power200314Keywords:
rolling stand, electric drive, spindle, wear, angular clearance, indirect measurement, observer, development, simulation model, research, technical execution, recommendationsAbstract
The systems monitoring the technical condition of rolling mill equipment should be developed based on modern digital technologies. Spindle connections breakdowns are one of the most frequent faults in the stands main electric drive lines. The paper justifies the problem of monitoring the spindle joints wear with periodic measurement of angular clearances in automatic mode On the example of the reversing stand of the plate mill 5000 of PJSC “Magnitogorsk Iron and Steel Works” (PJSC “MMK”) the problem of monitoring the wear of spindle joints based on recurring measurement of angular clearances in the automatic mode. The authors analyze the oscillograms of the speeds and torques of the motors in the emergency mode caused by the roll fault. The oscillatory properties of the “electric drive – roll” system, which increase the amplitude of the elastic moment during metal capture, have been confirmed. An angular gap observer has been developed. Its principle is based on the algorithmic calculation (restoration) of an unmeasured signal (gap) based on mathematical processing of physical parameters (speed and electromagnetic torque of the motor) measured at a given frequency. The paper also proposes a method for monitoring the wear of a spindle joint, which provides for an indirect determination of the angular clearance by integrating the speed with an open clearance. The interval for calculating the integral is determined by fixing the dynamic increase in the engine torque during its active closing while there is no metal in the rolls. The paper presents the structure of the observer and gives oscillograms that explain the possibility of its practical implementation. The characteristics of the simulation model of the electromechanical system of mill stand 5000 are given. The algorithms implementing the developed method are studied. A technical solution and an algorithm for adjusting the observer are proposed. The paper outlines the strategy for further
research and substantiates the directions in the creation of a digital spindle connections wear monitoring system. The technical effects provided by the implementation of the completed developments are noted.
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