In-situ centering clamping device and method for plate specimen of tensile fatigue tester

Abstract

The invention discloses an in-situ centering clamping device and method for a plate specimen of a tensile fatigue tester. The device comprises upper flat clamping blocks and lower flat clamping blockswhich are used for clamping the upper and lower ends of the plate specimen, a side clamping mechanism used for clamping the two sides of the plate specimen and a clamping driving mechanism used for driving the side clamping mechanism are arranged between the upper flat clamping blocks and the lower flat clamping blocks, one side of the side clamping mechanism is fixedly connected with a height and transverse direction adjustment mechanism used for adjusting the side clamping mechanism vertically and transversely, and the lower part of the height and transverse direction adjustment mechanism is fixed to the middle plane of a clamping head of the tensile fatigue tester through a switch-type magnetic base. By means of the device, the coaxiality of the plate specimen on a clamp is guaranteed,the centering accuracy purpose during plate specimen installation of the tensile fatigue tester is achieved, and the consistency and the accuracy of a test result are ensured; moreover, based on thepremise that same functions are achieved, the device is conciser, the production cost is greatly reduced, and the reliability of the device is greatly improved.

Description

technical field [0001] The invention relates to a clamping device. In particular, it relates to an in-situ centering and clamping device and method for a flat sample of a tensile fatigue testing machine. Background technique [0002] The material universal testing machine is a device used for testing the mechanical properties of various materials. The basic mechanical performance indicators of materials, such as yield strength, tensile strength, elongation, elastic modulus, etc., can be obtained through tensile, compression, bending and other tests. As a kind of measuring equipment used for quality inspection, it has higher requirements on the quality of its products, and the accuracy of its test results must meet the requirements of relevant standards. For tensile testing machines, a crucial parameter that affects the accuracy of their test results is concentricity. There are two factors that affect the coaxiality. [0003] One is the structural rationality of the testi...

AI Technical Summary

Problems solved by technology

This method will seriously affect the user's work efficiency for users with many specifications and a large amount of testing (such as the testing laboratory of a steel company).

In addition, when adjusting manually, it often occurs that the positioning ruler is adjusted incorrectly due to incorrect readings, resulting in the flat sample being tested under the wrong conditions and obtaining wrong test results.

[0008] 2. The positioning ruler is easily damaged

This situation is bound to have an inestimable impact on the accuracy and consistency of test results

[0010] There is another intelligent flat sample centering device for tensile testing machine (CN 104713770 A), which does not rely on the plate to directly contact the gauge length section of the flat sample during the centering process, so that the flat sample with higher surface requirements The surface of the gauge length section is obviously affected, and a large number of scratches are prone to appear, which has an important impact on the test results of the fatigue test, and its manufacturing cost is high and the operation is complicated

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