High-precision pitch changing equipment, pitch changing method thereof and pitch changing method of pitch changing mechanism

The invention discloses high-precision pitch changing equipment, a pitch changing method thereof, a pitch changing method of a pitch changing mechanism. The pitch changing mechanism comprises a base, a driving motor, a synchronous belt, optical shafts, toothless nuts, a connecting plate and a mounting plate, the two optical shafts are arranged on the base in an up-down spaced mode, and the synchronous belt is arranged on the peripheries of the two optical shafts in a sleeving mode and connected with an output shaft of the driving motor; a plurality of the toothless nuts are respectively arranged on each optical shaft, each toothless nut is correspondingly provided with the connecting plate, and each connecting plate is connected with the pick-and-place device mounting plate. The output shaft of the driving motor rotates to drive the synchronous belt to rotate clockwise or anticlockwise, the synchronous belt drives the two optical shafts to rotate synchronously, and the toothless nuts on the optical shafts con