Alloy steel pipe welding burr grinding structure and grinding method

The invention discloses an alloy steel pipe welding burr grinding structure and a grinding method, and relates to the field of grinding or polishing devices, machine tools or technologies, the alloy steel pipe welding burr grinding structure comprises a supporting frame, a U-shaped placing frame fixed on the supporting frame and a pipeline, and the pipeline can rotate on the U-shaped placing frame; a motor is further slidably mounted at one end of the bottom plate, a rotating shaft is fixedly mounted at the output end of the motor, a rotating disc is fixedly mounted on the rotating shaft, two racks are mounted on the rotating disc, a gear meshed with the racks is mounted between the two racks, an adjusting shaft is mounted on the gear, and a penetrating shaft driving the adjusting shaft to rotate is rotatably mounted on the side wall of the rotating shaft. A polishing ring is installed on the outer side of the welding position of the pipeline, relative friction is generated between the pipeline and the polish