Apparatus for measuring screw bolt elongation amount for steam turbine assembly measurement

The bolt extending length measuring equipment being used in steam turbine assembling measurement relates to a measure tool which measures the cylinder bolt extending length while the steam turbine cylinder is assembling. For the facet bolt which is fixed in the steam turbine cylinder by torque wrench, the extending length can also be measured according to estimate measure the predicted wrenching power and bolt extending length by measuring the wrench rotation angle, however the estimated wrenching power and bolt extending length are not so accurate. The guide holder (6) of the utility model equipping in the female thread hole (2.2) is connected with the sleeve (2) thread, a locator (7) is arranged on the guild holder (6); one end of a measuring rod (5) equipping in center inner bore (2.1) of the sleeve is touched with a guild rod (1.1) of the dial gauge (1), another is fixed with the measuring head (9) by a long rod (8); a convex plate (5.1) which is connected with an inner plate hole (2.3) by a spring (3) is arranged on the measuring rod (5) being positioned at the inner plate hole (2.3) of the sleeve; both ends of the guide finger (4) is arranged in the slot (2.4) of the sleeve (2) and the radial pylome of the convex plate (5.1). The utility model has advantages of high measuring accuracy conveniently measurement and the measuring rod is easy to machining.