Root positioning mechanism for T root blade profile detection of steam turbine

The invention provides a root positioning mechanism for T root blade profile detection of a steam turbine. The problems that the root is unreliable in positioning and clamping and the detection accuracy is influenced during the existing T root blade profile detection can be solved. The root positioning mechanism comprises a profile measuring tool bottom plate, wherein a positioning bottom plate is fixedly arranged on the profile measuring tool bottom plate; a root positioning assembly is fixedly arranged on the positioning bottom plate and comprises a positioning seat and radial positioning seats; the radial positioning seats symmetrical to each other are respectively arranged at two ends of the front side of the positioning seat; the positioning seat and the two radial positioning seats are of a concave structure of which the front side is open; a T root is positioned in the concave structure, and an upper shoulder surface of the T root is positioned by the two radial positioning seats; an inner radial surface of the T blade is positioned by the positioning seat; radial root tightening mechanisms are arranged on the positioning bottom plate and the front side of the concave structure; and the inner radial surface of the T root and the positioning seat are pressed by the radial root tightening mechanisms.