A FIXTURE FOR CHECKING OF AEROFOIL SECTIONS OF THE BABANA TYPE HOLLOW GUIDE BLADE OF LOW PRESSURE STEAM TURBINE AND A METHOD FOR THE SAME

摘要

A fixture (F) for checking of aerofoil sections of the banana type hollow guide blade of low pressure steam turbine consists of a base plate (6), a support plate (7) mounted on the base plate (6) for supporting a plurality of templates (9, 10) and for arresting the movement of templates in vertical direction. An end butting plate (8) butts one end face of the blade (1) for keeping the blade (1) in position for checking. The templates (9, 10) are located on the base plate by a plurality of cylindrical pins (14). The said templates are butted against the face of the base plate for arresting the movement of the said templates in horizontal direction. The fixture (F) is disposed with the sectional templates (9, 10) and tapered pins (11) for holding the aerofoil surface of the blade at two extreme position for the mounting arrangement of the banana blade (1) in the fixture (F) when the said taper pins (11) are disposed at four locating points of suction (2) and pressure (3) surfaces of the blade (1) for accommodating the variations of the actual sectional profile of the blade (1).