Clamp with all-freedom constraints for impact fatigue testing machine

Abstract

The invention discloses a clamp with all-freedom constraints for an impact fatigue testing machine. A general clamp can not ensure reliable clamping under effects of reciprocating impacts of the impact fatigue testing machine, and even the clamp itself is damaged. The clamp of the invention is composed of a distance adjusting mechanism, an X-direction clamping mechanism, a Y-direction clamping mechanism, a Z-direction clamping mechanism and a Z-direction clamping and self locking mechanism, wherein the distance adjusting mechanism is used for adjusting the distance between two sample supporting seats to be applied to samples of different lengths; the X-direction clamping mechanism, the Y-direction clamping mechanism and the Z-direction clamping mechanism are used for clamping a sample to constrain all freedoms of the sample; and the Z-direction clamping and self locking mechanism is used for preventing the Z-direction clamping mechanism in the impact direction from getting loose. The clamp of the invention can be used for clamping a rectangular section sample for the impact fatigue testing machine, all freedoms of the sample can be constrained, and as the self locking device is arranged in the impact direction, the reliability and the safety of sample clamping can be ensured.

Description

technical field [0001] The invention belongs to the technical field of fixtures, and relates to a full-degree-of-freedom-constrained fixture for an impact fatigue testing machine, which is specially used for clamping a rectangular cross-section sample subject to the vertical reciprocating impact of the impact fatigue testing machine. Background technique [0002] The components of the mechanical system are sometimes subjected to repeated impact loads, and their impact fatigue characteristics need to be evaluated. At present, domestic impact fatigue testing machines have not yet produced mature products, and the fixtures for clamping impact fatigue testing machine samples are quite lacking. Different from the vertical clamping of the existing fatigue testing machine, the sample of the impact fatigue test is generally clamped in the horizontal direction, and because the sample is continuously subjected to reciprocating impact, the general fixture cannot guarantee reliable clam...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a full-degree-of-freedom tester for impact fatigue testing machines, aiming at the defects that the impact fatigue testing machine fixtures cannot hold rectangular cross-section samples of different lengths, and cannot guarantee the safety and reliability of clamping samples under impact. Constrained fixture, which can be used to clamp rectangular cross-section samples of any size, and can constrain all degrees of freedom of the sample, and is equipped with a self-locking device in the impact direction to ensure the reliability and safety of sample clamping

Images