High-precision diaphragm adjusting mechanism

The invention relates to the technical field of photoelectric instruments, in particular to a high-precision diaphragm adjusting mechanism. Comprising a shell and further comprises a driving wheel/driven wheels, the driving wheel and the two driven wheels are rotationally installed in the shell, and the driving wheel and the driven wheels are distributed up and down; the steel belt is connected between the driving wheel and the driven wheel in a winding mode, and the top of the driving wheel and the steel belt are detachably locked through a pressing block; the left diaphragm and the right diaphragm have the same structure and are distributed in a central symmetry manner, the left diaphragm and the right diaphragm are vertically mounted in the shell in a sliding manner, and the outer side ends of the left diaphragm and the right diaphragm are detachably locked with the steel belt; and the tensioning wheel is arranged at the bottom of the inner cavity of the shell and can be vertically adjusted, so that the st