Mechanical type rotation-speed-adjustable fan

The invention belongs to the technical field of fans and particularly relates to a mechanical type rotation-speed-adjustable fan. The mechanical type rotation-speed-adjustable fan comprises a fan rotary shaft, fan blades, a rotation speed adjusting mechanism, a gear motor, a conical hollow friction wheel and the like and is characterized in that the rotation speed of the fan blades is adjusted through the mechanical mechanism completely, when a shifting block is limited by the limit block of a first speed-position mechanism, an output friction wheel in in friction fit with the front conical end of the conical hollow friction wheel, and the fan blades rotate fast; when the shifting block is limited by the limit block of a second speed-position mechanism, the output friction wheel is in friction fit with the middle position of the conical hollow friction wheel, and the fan blades rotate faster; when the shifting block is limited by the limit block of a third speed-position mechanism, theoutput friction wheel is