Device for measuring crane track center line

The utility model is suitable for the technical field of engineering measurement. The utility model provides a device for measuring the center line of a crane track. The device comprises a measuring track and a measuring assembly used for measuring a track center line. The measuring assembly comprises a connecting piece, a positioning piece and a rotating shaft. The connecting piece is positionedon the upper surface of the upper flange; the positioning pieces are three identical components; the positioning piece is stringed on a shaft where the connecting piece is located; wherein the connecting pieces and the positioning pieces are connected through the rotating shafts, the three positioning pieces are located on the same horizontal plane when clamping the web, and by arranging the connecting pieces and the positioning pieces, when the positioning pieces make contact with the web, the positions where the connecting pieces are located are the positions of the center lines of the rails. Therefore, no matter wh