（1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling， Yanshan University，Qinhuangdao 066004，Hebei，China 2. Qinhuangdao Shouqin Metal Materials Co.， Ltd.， Qinhuangdao 066000，Hebei，China）
Abstract：A lot of complex factors were analyzed in the iron making productive on-site in order to deal with the fluctuation of burden distribution laps of bell-less top in blast furnace. The key reason of fluctuation that the feedback angle of selsyn could not correspond to the rotating angle of throttle valve accurately was confirmed in the current study. The mathematic model was built based on the control mode by means of the feedback angle of selsyn. The rotating angle of throttle valve was controlled by the feedback of selsyn instead of the linear displacement of hydro-cylinder. Magnetostrictive displacement transducer was assembled in the hydro-cylinder so as to keep the signal away from outside interference. The linearity error was less than 150 μm when the displacement range of Magnetostrictive displacement transducer was 300 mm. The stability of the burden distribution was improved significantly and the error range of laps between burden distribution and foreman requirement is less than ±0.5 after using the new controlled mode.
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2017, Vol. 52 
