Opening method of blast furnace hot air bustle pipe

The invention provides an opening method of a blast furnace hot air bustle pipe. The opening method comprises the following steps: mounting a hot air branch pipe: wherein one end of the hot air branchpipe is mounted at an air inlet of a blast furnace and the other end faces towards the bustle pipe; preparing a positioning device, wherein the positioning device comprises a positioning plate, a center rod and a scribing pointer, one end of the center rod is fixedly connected with the positioning plate, and the scribing pointer is detachably installed on the center rod; forming a small hole, wherein the opening range of the bustle pipe is estimated according to the positions of the hot air branch pipes, and the small hole is formed in the bustle pipe within the opening range; mounting the positioning device: wherein the end of the central rod extends into the bustle pipe through the small hole, the positioning plate is fixed on the hot air branch pipes, then the positioning device entersthe bustle pipe, the scri