Split type welding structure spiral shaft of spiral vertical mill

The utility model discloses a split type welding structure spiral shaft of a spiral vertical mill and belongs to the technical field of mining machinery. The spiral blade structure comprises a main shaft, a flange and a spiral blade, and is characterized in that a shaft head at one end of the main shaft is provided with a spigot, the flange is sleeved outside the shaft head from one end, provided with the spigot, of the main shaft and correspondingly lapped on the spigot, the flange is welded with the main shaft, and the main shaft is welded with the flange. After the main shaft and the flange are welded, a key groove is formed in the end face in the radial direction at the same time, and the spiral blade is welded to the outer surface of the main shaft. The flange is compact and simple in structural form, convenient to manufacture, capable of effectively reducing manufacturing cost, firm and reliable, product quality is improved, and the phenomenon that the joint face of the flange and the shaft body is frac