External grinding head for large-sized sleeping car

The invention relates to an external grinding head for a large-sized sleeping car, which comprises a connecting sleeve in which a spindle is arranged. The external grinding head is characterized in that: one end of the connecting sleeve is provided with an end cap, which the other end is provided with a motor; and one end of the spindle is connected with the power output end of the motor, while the other end extends out of the end cap and is provided with an abrasive disk at the end part. The spindle and the connecting sleeve are fixed by a bearing. The abrasive disk and a gasket are fixed on the spindle by a round nut. The motor is arranged on a fixed plate. Compared with the prior art, the external grinding head has the advantages that: 1, the installation is so convenient that the external grinding head can be arranged on general sleeping cars without any professional installation personnel, and the application range is wide; 2, the structure is simple and practical and no high maintenance cost is required; 3, the abrasive disk can be replaced simply by a common worker without requiring calibration and dynamic balance like a grinding wheel, to be replaced, of an external grinder, so time and labor are saved; and 4, the operation is simple, common lathe operators can operate the external grinding head independently without receiving training.