Displacement measuring device for tensile testing

Abstract

The invention discloses a displacement measurement device for a tensile test. The displacement measurement device comprises an upper cross bar, a stand column and a lower cross bar. One end of the lower cross bar is connected to the stand column and the other end of the lower cross bar is connected to a lower measurement rod. A support frame is provided with a first connection end, a second connection end and a third connection end. The upper end of a guide pipe is connected to the first connection end. The upper edge of the second connection end is provided with a second through hole along a vertical direction. An upper measurement rod goes through the second through hole and the lower end of the upper measurement rod presses against the lower measurement rod. A gap is formed between the upper measurement rod and the second through hole. A limiting part is arranged on the upper measurement rod and is located above the second connection end. The shortest distance between the limiting part and the second connection end is less than or equal to a measuring range of an installed extensometer. The third connection end is connected to the upper cross bar. The upper cross bar and the lower cross bar are arranged along a horizontal direction. The stand column, the guide pipe, the upper measurement rod and the lower measurement rod are arranged along a vertical direction. The displacement measurement device protects an extensometer, reduces labor intensity of an operator, improves production test efficiency and reduces a cost.

Description

technical field [0001] The invention relates to equipment for high-temperature tensile testing, in particular to a displacement measuring device for protecting an extensometer. Background technique [0002] Universal testing machine is a material testing machine integrating tensile, bending, compression, shearing and other functions, mainly used for mechanical performance tests of metal and non-metal materials. [0003] In the tensile test of metal materials and non-metallic materials, the extensometer can be directly clamped on the stretched part of the sample during the normal temperature tensile test, so as to obtain the specified non-proportional elongation stress value. . In the high temperature tensile test, due to the limitation of high temperature and high temperature furnace, the extensometer cannot be directly clamped on the tensile part of the sample, such as figure 1 As shown, the beam 1 at the mobile end is provided with a mobile bracket 3, and the testing mac...

AI Technical Summary

Problems solved by technology

[0004] figure 1 Although the displacement measuring device 6 with the extensometer installed can be used to measure the elongation parameter and calculate the non-proportional elongation rate, if an operation error occurs during the experiment, the action of taking the extensometer will be slow, which may cause The extensometer exceeds the limit, which affects the accuracy of the extensometer. In severe cases, the extensometer will be scrapped

For example: ①During the test, due to the relatively high brittleness of some materials, when doing the tensile test, the yield point just appeared, and the sample 5 was broken. At this time, the extensometer 7 is still installed in the displacement measurement On the device 6, under the action of inertia, the moving beam 1 of the testing machine accelerates, and the moving distance exceeds the range of the extensometer 7, causing the extensometer 7 to exceed the range (the range of the extensometer is 10mm), after the extensometer exceeds the range Accuracy will be affected; ② When doing the experiment, if the tester's attention is not concentrated, he forgets to take the extensometer 7 when the test parameters have been completed and the sample has been broken. In this case, the extensometer will be scrapped, and Extensometers imported from abroad generally cost 30,000 to 40,000 RMB per piece. Therefore, the production test cost is high and the test rate is very low, which is far from suitable for batch production inspection.

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