CONNECTION OF THE TEMPERATURE IN CONTACT AREA OF THE WHEEL-RAIL SYSTEM WITH THE RAILWAY SLOPE OF INDUSTRIAL RAILWAY TRANSPORT

The  effect  of  the  guiding  slope  of  the  industrial  railway  track on the temperature in the contact area of the wheel of the career locomotive with the rail has been analyzed. As a result of theoretical and experimental studies it was found that the magnitude of the guiding slope of industrial railways affects a temperature change in the system wheel – rail of locomotives and is characterized by a temperature  coeffi cient of the slope ky . To determine the values of k_y on the mine locomotive  of  SCHÖMA  model  –  350  (Germany)  the  experimental stu dies were conducted at the enterprise of JSC “MOSMETROSTROY” in the context of the mines under construction in the Moscow metro. The temperature and sliding velocity in the contact zone of the  wheel – rail system was measured at different speeds and inclines of  the track. It was found that with increasing of track slope the temperature in contact zone of the wheel – rail system increases. Therefore the permissible speed of slipping of traction wheel pairs of the locomotive with the profiled sections in the quarry conditions will be higher. It was also shown that the new profiles of the working surfaces of wheel and rail, based on the criterion of temperature increase in the contact zone of 300 °С for conditions characteristic for open mining  parameters,  do  not provide rational operating conditions. Value of the temperature coefficient of the slope k_y in the interval of career track slope from 0 to 10 ‰ is equal to k_y = 0. The necessity to determine the temperature in the contact zone of the wheel –rail system for conditions of open mining works according to the formulas recommended for railways of general use is shown. The results of calculations performed by the developed technique showed satisfactory convergence with the experimental results. The approximation error of the coefficient of the mining conditions impact Kmc in the range of 25 ‰ to 45 ‰ is less than 5 %. The results of studies carried out according to the developed methodology, depending on the area of interest, are accepted for use by the enterprises of OJSC Uralasbest  and ZUMK-Engineering LLC (Zapadno-Uralsky Concern Group of  Companies, Russia).

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