Test device for measuring double bolt relaxation under tangential alternating load

Abstract

The invention discloses a test device for measuring double bolt relaxation under tangential alternating load, which belongs to the field of mechanical engineering and mechanics. The device has the advantages that the structure is simple; the price is low; the bolt relaxation can be reflected through measuring attenuation of axial tightening forces of the double bolts; influences on the bolt relaxation by the interaction between the double bolts and the joint surface tangential displacement changes are also considered; the test precision for measuring the tangential relaxation of the double bolts and the data accuracy are improved; and the sensitivity is high, and the response speed is quick. The device comprises an upper connector, pre-buried strain gauge bolts, an eddy current transducerand a lower connector. The pre-buried strain gauge bolts with higher precision are adopted, and the data can be outputted in real time and saved; and the high-precision loading and the frequency control on a tensile test machine are also combined, and the data accuracy is ensured. A large amount of accurate data are provided for follow-up analysis, and the measurement precision is improved. The device reflects the interaction between the double bolts through the pre-tightening force changes and different relaxation curves of the double bolts during tightening and loading processes.

Description

technical field [0001] The invention relates to a test device for measuring the relaxation of double bolts under tangential alternating load, which belongs to the field of mechanical engineering and mechanics. Background technique [0002] Bolt connection is widely used in mechanical structures. It has the advantages of simple structure, reliable connection, and convenient disassembly. As an important connection part, the performance of bolts is crucial to the reliability and safety of the structure. Due to the long-term use of these structures, the fasteners with a certain bolt pre-tightening force will decrease under the action of alternating external force, resulting in loosening of the bolted joints, and the loosening of the bolt fasteners will cause Failure of machinery and equipment will reduce the service life and reliability of the equipment, and even cause safety accidents, seriously threatening personal and property safety. Therefore, it is necessary to find out t...

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Problems solved by technology

[0004] Based on the above, in order to solve the above problems and study the law of bolt relaxation more systematically, in view of the fact that the current double-bolt relaxation research is not accurate and rarely considers the interaction of the two bolts and the influence of the tangential displacement change of the joint surface on the bolt relaxation, Therefore, a device with simple structure, more accurate measurement data and high measurement accuracy is required

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