Floating guide rail for three-coordinate measurement

The utility model discloses a floating guide rail for three-coordinate measurement, relates to the technical field of three coordinates, and solves the technical problem of how to arrange a positioning structure for preventing a bearing device from sliding in a conveying device in a simple structural form. The device comprises a rack and a floating unit arranged on one side of the rack, and the floating unit comprises a supporting rail vertically arranged on the rack in a sliding mode, a supporting assembly arranged on one side of the supporting rail and a linear driving source. The supporting assembly comprises a guide strip transversely arranged on the rack in a sliding mode, a groove formed in the upper surface of the guide strip and a supporting roller which is arranged on the side wall of the supporting rail and carries out gravity supporting through the upper surface of the guide strip, and the driving source drives the guide strip to transversely slide. According to the utility model, vertical limitati