Automatic polishing machine for outer walls of pipelines

[0023] The technical solutions of the present invention will be further described below with reference to the accompanying drawings.

[0024] The first polishing arm 100 has the same structure as the second polishing arm 200, and the rotational speed and rotation direction of the motor can be set to be different. The two ends of the first and second polishing arms are respectively connected, and the connected first and second polishing arms have an included angle with the pipe section, so that the polishing machine can automatically walk on the pipe due to the force. In this embodiment, the first and second polishing arms are arranged symmetrically with respect to the pipeline, that is, the projection of the first and second polishing arms on the plane where the axis of the pipeline is located is an "X" shape. In particular, the upper surface of one end and the lower surface of the other end of the first polishing arm 100 are respectively connected to the lower surface of one end