Spiral extension sleeve of dust blocking machine

The utility model discloses a spiral extension sleeve of a dust blocking machine, which comprises a groove sleeve and a mounting column, the lower end part of the groove sleeve is connected with the mounting column, the groove sleeve and the mounting column are arranged on the same axis, a groove matched with a cross flange at the spiral tail end is arranged in the center of the upper end of the groove sleeve, and the cross flange at the spiral tail end is arranged in the groove sleeve. A cross-shaped flange matched with a spiral groove in an original block making machine is arranged on the side face of the installation column, after the block making machine is used in a spiral mode, a good block making effect cannot be achieved due to the fact that the head portion is shortened due to abrasion, at the moment, the blunt portion of the head portion can be cut off, a spiral sleeve is sleeved on the head portion, and then the head portion is installed on the block making machine. The utility model provides a spi