OBRABOTKAMETALLOV Vol. 25 No. 3 2023 technology а b Fig. 8. Rail grinding trolley device: a – grinding trolley with transverse displacement frame; b – a grinding cradle with an installed grinding head and the possibility of transverse inclination Ta b l e 1 Technical characteristics of modernized electric motors Switching scheme Mode Current frequency, Hz Voltage, V Current, A Rotation speed, min–1 Shaft torque, N·m Power, kW D Idling 85 254 24 5100 0 0 Nominal mode 85 254 45 5029 49.8 26.2 Increase of the torque by 1.15 times from the nominal 85 254 56 5019 57.3 30.1 Increase of the torque by 1.5 times from the nominal 85 254 66 4994 74.7 39.1 Increase of the torque by 1.63 times from the nominal 85 254 70 4985 81.2 42.4 Increase of the torque by 2 times from the nominal 85 254 80 4958 99.6 51.7 Pressing the grinding wheel to the rail surface being processed is carried out on the basis of the pressure difference in the rod and piston cavities of the pneumatic cylinder. Pressure adjustment in the cavities of the pneumatic cylinder is carried out by a proportional pressure regulator based on data on the current load in the windings of the grinding motor. In accordance with the previously established characteristics of the technological process of high-speed grinding of rails, the URSH has the following technical characteristics: – the range of rotation speed of the grinding wheel is 3,600–5,000 rpm; – the range of change in the trolley movement speed is 4–30 km/h; – the range of the angle of inclination of the grinding motor from + 20° to - 60° from the vertical; – the angle of attack of the grinding wheel is 0.35° and is provided with the opening to meet the working movement of the trolley; – the range of change in the pressing force of the grinding wheel to the rail is 0–5 kN without taking into account the mass of the grinding motor.
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