Shape-adjusting inner supporting roller device of spiral steel pipe former and using method of shape-adjusting inner supporting roller device

The invention belongs to the technical field of spiral welded pipe manufacturing, and particularly relates to a spiral steel pipe former shape adjusting inner supporting roller device and a using method. The device comprises a former inner pressing rod, a base connecting mechanism is fixedly connected to the upper portion of the left end of the former inner pressing rod, a big arm stand column outer box is arranged on the top of the base connecting mechanism, a big arm stand column inner box is arranged on the top of the inner side of the big arm stand column outer box in a sleeving mode, and a jack is arranged at the bottom of the inner side of the big arm stand column outer box. The telescopic end of the jack is fixedly connected with the bottom of the large arm stand column inner box body, two small supporting arms are arranged on the top of the inner side of the large arm stand column inner box body and form a Y shape, a small arm angle positioning lead screw is arranged between the Y-shaped small support