Extensometer for measuring high-temperature structural deformations by magnification

摘要

The present invention relates to an extensometer for measuring high-temperature structural deformations by magnification, the structure of the extensometer is that: two mounting block assemblies are mounted at the planar ends of two extension bars respectively, the top ends of the extension bars are connected tightly with the surface of a test piece, two connecting pieces are mounted at the inner sides of the two mounting block assemblies respectively, a deformation magnifying mechanism and a sensor bracket are mounted on the connecting pieces, a sensor is mounted on the sensor bracket, two connecting pieces are mounted on a same straight line, and the straight line is parallel to a straight line at which the top ends of the two extension bars are located, so as to ensure that the deformation of the test piece is delivered equally to the deformation magnifying mechanism on the connecting pieces. The present invention can measure local deformations of various metal and non-metallic structures online for a long time in real time at high temperatures, extend the deformation of the test piece at high temperatures outside of the high temperature region, and measure the deformations after they are magnified through a mechanical magnifying mechanism, thus the present invention has a very high linearity, resolution, and accuracy, meanwhile has a light structure and a small size, and is easy to install.

主权项

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 (5a) and a second mounting block (5b), a circular extension bar mounting surface (11) is arranged at the middle part of the contacting interface between the first mounting block (5a) and the second mounting block (5b), four mounting holes (12) are arranged on the extension bar mounting surface (11) respectively, one side of the second mounting block (5b) has a first semi-circular boss, at the middle part of which is arranged a first fixing hole (13a); one end of the connecting piece (4) is a second semi-circular boss, inside which is arranged a second fixing hole (13b), the connecting piece (4) and the second mounting block (5b) are fixed by inserting the mounting screws (10) into the first fixing holes (13a) and the second fixing holes (13b), 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).