Integrated steel rail grinding unit and steel rail grinding equipment

The integrated steel rail polishing unit comprises a polishing module and a feeding module, the polishing module comprises a frameless motor and a core part, a rotating shaft sleeve is arranged in the frameless motor in a sleeved mode, a main shaft is arranged in the rotating shaft sleeve in a sleeved mode, and the frameless motor, the rotating shaft sleeve and the main shaft are coaxially arranged. The spindle is connected into the core part in a penetrating mode, a grinding wheel is installed at the bottom end of the spindle, and a box body is arranged outside the core part. The feeding module comprises a feeding motor, the output end of the feeding motor is connected with a lead screw, the lead screw and the main shaft both penetrate through the core part, and the lead screw drives the main shaft to move axially through the core part. The whole inertia is small, a small-inertia and low-power feeding motor can be matched, the operation energy consumption is reduced, meanwhile, a middle transmission part is