Rotational assembly and handle having rotational assembly

A rotating assembly, comprising:

• a rotary shaft (1), an accommodating body (2) and a position-limiting switch (3), wherein
• an outer wall of the rotary shaft (1) is provided with a first tenon (11) and a second tenon (12);
• the accommodating body (2) is provided with a matching hole (21) for the first tenon (11) to insert and rotate therein, an inner wall of the matching hole (21) is provided with a convex rib (22), and by rotating the rotary shaft (1), a side wall of the first tenon (11) and a side wall of the convex rib (22) butt against or separate from each other, so that in an axial direction of the rotary shaft (1), the rotary shaft (1) is fixed or movable relative to the accommodating body (2);
• and
• when the side wall of the first tenon (11) and the side wall of the convex rib (22) butt against each other, the position-limiting switch (3) and the second tenon (12) are clamped together to prevent the rotary shaft (1) form rotating relative to the accommodating body (2).