EXPLANATION OF NOMINAL FREQUENCY OF IMPACTS OF MACHINE PUNCH TO OPEN THE IRON NOTCH
The purpose of the article is to determine the nominal frequency of impacts of a machine for opening the iron notch of blast furnace taking into consideration mechanical characteristics of bored notch masses and the freque- ncy of rotation of the drill rod. The effect of such factors as ultimate pressing strength and frequency of rotation of the drill rod on the desired frequency of punch impacts was estimated analytically. The recommendations to cho- ose the design parameters of hammer mechanism of the machine for opening the iron notch of blast furnace were worked out. There is a theoretic consideration of a process of interaction of tools and frozen notch mass while using different methods of opening of iron notch of blast furnace. The article presents new scientifically based theoret- ical results, which are essential for solving the problem of determining the power parameters for opening the iron notch, as well as for a choice of rational parameters of the mechanism of boring of opening machines. The problem was solved on the basis of a comprehensive study of real notch masses and iron notches of blast furnaces, as well as structures of punch. A mathematical model that allows determining the nominal frequency of the punch impa- cts was designed