Part dimension measurement instrument's top quick change device

The utility model discloses a part dimension measurement instrument's top quick change device, including turn round, a plurality of top, quick change slide rail, short chute, turn round including consecutive from top to bottom first motor, telescoping device, wedge head, the wedge head cross section is in -line, cross, triangle -shaped or hexagon, and the inside geomery of notch of top plane end is the same with wedge head, the quick change slide rail for rectangular arc and arc core on the axis of turning round, the equidistance is equipped with the round hole on the quick change slide rail,every round hole is equipped with the bearing, every is top fastens with the pointed end down in the bearing, the quick change slide rail slides between two short chute, and two short chute slide on the long chute of measuring apparatu wall at the vertical fixation, accessible constant head tank and location bump location between the quick change slide rail short chute. This device is applicable to the any instrument that