Variable-diameter coiling machine

The invention discloses a variable-diameter coiling machine, and belongs to the technical field of metallurgical machinery. The variable-diameter coiling machine comprises a rack, and is characterizedin that two ends of a 6-inch reel are fixed to one lateral side of the rack through bearing seats, the right end of the 6-inch reel extends out of the bearing seat and is connected with a motor through a coupler, and the bearing seats at the two ends of the 6-inch reel are respectively hinged to one air cylinder through a hinge lug; the two ends of a 3-inch reel are fixed to the other lateral side of the rack through bearing seats, the bearing seats at the two ends of the 3-inch reel are respectively connected with one air cylinder through a hinge lug, the bearing seats are connected with a linear sliding block, the linear sliding block is arranged on a linear guide rail and slides on the linear guide rail, and the linear guide rail is fixedly mounted on the rack. The variable-diameter coiling machine realizes the coiling of ultra-thin stainless steel belts with different inner diameters, improves the product tension precision and edge rolling uniformity precision, reduces the labor intensity of an operator, ensures the operation safety, and provides a high-level and high-precision stainless steel product for a user.