OBRABOTKAMETALLOV technology Vol. 25 No. 3 2023 Fig. 7. Mounting unit of the working rail: 1 – rail for moving the sanding trolley; 2 – sleeper; 3 – test sample (working rail); 4 – spacer; 5 – lining; 6 – mounting studs; 7 – nut Fig. 6. General view of the URSH: a – section of the railway track; b – rail grinding trolley; c – drive; d – DGS а b c d As the drive of the grinding wheel, a standard RSHP electric motor is used, upgraded to be able to realize the shaft rotation speed of 5,000 min-1 with the torque on the shaft of the electric motor necessary to ensure the operation of the grinding wheel. The modernization was as follows: 1) increasing the nominal rotation speed of rolling bearings from 4,000 min-1 to 6,700 min-1 by replacing the rolling bearing brand; 2) changing the stator winding circuit from Δ (440 V, 60 Hz) to Υ (380 V, 50 Hz) for connecting the stator windings to Δ to provide increased power on the motor shaft. The actual, calculated technical characteristics of the modernized grinding motors are presented in Table 1. The frame of the grinding block is mounted on axle in a movable frame of transverse displacement. A lever mechanism with a pneumatic drive is located in the frame, which provides pressing of the grinding wheel with the required force up to 3 kN. Also, this mechanism allows setting the angle of attack of the grinding wheel equal to 0.35°.
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