EXPERIMENTAL RESEARCHES OF WORKING PARAMETERS OF SPIRAL SCREWS FOR DISPENSING OF SLAGGING MIXTURES IN MOLDS OF CONTINUOUS CASTING MACHINES

The application prospects of dispensing systems for slagging mixtures in molds of continuous casting machines are illuminated and the necessity of their further improvement, in particular, through the use of spiral screw, is substantiated. The method and results of experimental researches of design and power parameters of flexible screws are given with inner diameter 15, 20 and 25 mm. They transport the fine granular materials by steel coils rotated with a frequency of 250–500  rpm and differed by outer diameters (11, 16 and 18  mm) and pitch of coils (5, 10, 15 and 20 mm). It is found, that the dependence of volume efficiency of spiral screw from rotation frequency of the working part in the studied range is linear for the tested combinations of geometrical parameters of the transporting device. Noticeable effect on the flow characteristics of the screw system has a ratio of spiral coil pitch Sv and its outer diameter dsp . The dependence of the change of spirals volume  flow for one of its turnover from this ratio has a non-linear form with a maximum in the range  Sv /dsp  =  0.9–1.1, and the minimum specifi  c energy of spiral screw was fi  xed at the values of Sv /dsp  =  0.5–0.6. The obtained data are used during the calculation and construction of a linear series of next generation dispensing slag-forming mixtures systems in molds of continuous casting machines with different cross-section.

slagging mixture, mold, flexible screw, sleeve, spiral, coil, winding pitch, torque, volumetric flow rate

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