Stair stepper

A stair stepper, comprising:

• a base;
• a rotating mechanism comprising a first rotating shaft and a second rotating shaft that are fixed in an intersecting manner, the rotating mechanism being rotatably connected to the base through the first rotating shaft;
• and a pedal mechanism, a first sleeve pipe being provided in the middle of the pedal mechanism, and the pedal mechanism being rotatably sleeved on the second rotating shaft through the first sleeve pipe,
• wherein the stair stepper further comprises a linkage member, the linkage member comprises a second sleeve pipe, a limiting rod is provided on an outer wall of the second sleeve pipe, a vertical rod of the limiting rod is perpendicular to an axis of the second sleeve pipe and is fixedly connected to the second sleeve pipe, and a transverse rod of the limiting rod is parallel to the axis of the second sleeve pipe;
• the first sleeve pipe and the second sleeve pipe are sequentially sleeved on the second rotating shaft, and the linkage member is capable of rotating around the second rotating shaft and is capable of sliding on the second rotating shaft;
• an adapter is rotatably connected to a mounting position, corresponding to the first rotating shaft, on the base, and the transverse rod of the limiting rod is slidably connected to the adapter;
• a first limiting groove is provided at an edge of a pipe opening at one side, adjacent to the second sleeve pipe, of the first sleeve pipe, and a second limiting groove is provided on the base, so that when the linkage member slides towards the side of the first sleeve pipe, the vertical rod of the limiting rod is capable of entering the first limiting groove, and when the linkage member slides away from the side of the first sleeve pipe, the vertical rod of the limiting rod is capable of entering the second limiting groove.