Patent ID: 8955231
Filing Date: 2015-02-17
Classification: G01B,G01N

Abstract:
1. An extensometer for measuring high-temperature structural deformations by magnification, characterized in that the extensometer for measuring high-temperature structural deformations by magnification is consisted of a pair of extension bars ( 7 ), two mounting block assemblies ( 5 ), two connecting pieces ( 4 ), a deformation magnifying mechanism ( 6 ), a sensor ( 1 ) and a sensor bracket ( 3 ), the extension bar ( 7 ) is a round bar, one end of which is planar, the other end of which is tapered; the mounting block assemblies ( 5 ) are fixed at the planar ends of the extension bars ( 7 ) by inserting mounting screws ( 10 ) into mounting holes ( 12 ), respectively; the mounting block assembly ( 5 ) includes a first mounting block ( 5 a ) and a second mounting block ( 5 b ), a circular extension bar mounting surface ( 11 ) is arranged at the middle part of the contacting interface between the first mounting block ( 5 a ) and the second mounting block ( 5 b ), four mounting holes ( 12 ) are arranged on the extension bar mounting surface ( 11 ) respectively, one side of the second mounting block ( 5 b ) has a first semi-circular boss, at the middle part of which is arranged a first fixing hole ( 13 a ); one end of the connecting piece ( 4 ) is a second semi-circular boss, inside which is arranged a second fixing hole ( 13 b ), the connecting piece ( 4 ) and the second mounting block ( 5 b ) are fixed by inserting the mounting screws ( 10 ) into the first fixing holes ( 13 a ) and the second fixing holes ( 13 b ), the other end of the connecting piece ( 4 ) is a cuboid, inside which are arranged two fixing grooves ( 14 ), the deformation magnifying mechanism ( 6 ) and the sensor bracket ( 3 ) are mounted in the fixing grooves ( 14 ); the deformation magnifying mechanism ( 6 ) is a stepped symmetrical square cylinder with a constant width, four flexible hinges ( 17 ) are arranged symmetrically at the junctions of steps and the middle part of the cylinder, and form an arch bridge-shaped structure, two mounting holes ( 16 ) are arranged at each of two ends of the deformation magnifying mechanism ( 6 ), so as to mount the deformation magnifying mechanism ( 6 ) on the connecting pieces ( 4 ), the vault of the arch bridge-shaped structure is downward, the midpoint of the deformation magnifying mechanism ( 6 ) acts as an output end ( 18 ), the sensor ( 1 ) is mounted on the sensor bracket ( 3 ), perpendicular to the deformation magnifying mechanism ( 6 ) and connected to a test terminal ( 9 ).