Rotating speed measuring device and rotating speed measuring method suitable for bell-type furnace fan

Abstract

The invention provides a rotating speed measuring device and a fan rotating speed measuring method suitable for a bell-type furnace fan. The rotating speed measuring device comprises a rotating speedmeasuring front-end signal conditioning circuit, an MCU main control module, a digital-to-analog conversion module, a 4-20 mA output module and a voltage adjusting and distributing module. The rotating speed measurement front-end signal conditioning circuit comprises a signal sampling module, a photoelectric isolation module, a driving enhancement module and a signal filtering module, wherein thesignal sampling module, the photoelectric isolation module, the driving enhancement module, the signal filtering module, the MCU main control module, a digital-to-analog conversion module and an 4-20mA output module are connected in sequence; the voltage adjusting and distributing module is connected with the MCU main control module, the digital-to-analog conversion module and the 4-20mA output module. The rotating speed measuring front-end signal conditioning circuit is used for collecting, isolating, enhancing and filtering signals output by the rotating speed sensor, the signals input intothe microcontroller are purer, and therefore a more accurate rotating speed value is obtained.

Description

technical field [0001] The invention relates to the field of speed measurement, in particular to a speed measuring device and a method for measuring the speed of a fan of a bell-type furnace, especially a speed measuring device and a method for measuring a speed of a fan suitable for a high-temperature fan. Background technique [0002] The high-temperature circulating bell-type furnace fan used in the bell-type furnace promotes the circulation of the protective gas in the furnace, improves the temperature uniformity of the heated material in the furnace and improves the efficiency of temperature control, and finally improves the quality of steel coil products and the production efficiency of the bell-type furnace. Due to the harsh working conditions of the high-temperature circulating bell-type furnace fan, it needs to run at high load and high speed in a high-temperature environment, so monitoring the speed of the motor has become an important issue. In the past, indirect ...

AI Technical Summary

Problems solved by technology

This solution converts the received infrared light signal into a digital signal through a voltage comparator. The accuracy of such a digital signal is relatively rough, and it only displays the measured speed locally without further transmission and control. It is not suitable for the bell furnace industry.

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