In the model design of commercial revolving stairs, the revolving stairs save space. If the space is relatively small, generally speaking, the opening size of the revolving stairs can be opened to 1300 * 1300MM, or 1400 * 1100MM at least. Now, the revolving stairs, also known as the central column revolving stairs, have only one stress point, that is, the center is stressed. The structure of the spiral staircase causes