High-precision probe clamping device for sampling positioning in neutron diffraction measurement

Abstract

The invention provides a high-precision probe clamping device for sampling positioning in neutron diffraction measurement. The device comprises a top plate, a base, a plurality of support connection columns, an upper positioning member and a lower positioning member, wherein the top plate and the base are arranged up and down; the support connection columns are vertically arranged between the topplate and the base; the upper positioning member and the lower positioning member are respectively arranged at center positions of the top plate and the base; coaxial and uni-diameter through holes are formed in the two positioning members to contain the upper and lower ends of a probe; a threaded hole matched with a fastening screw and communicated with the through hole in the corresponding positioning member is arranged on each positioning member; the threaded holes are horizontally arranged and located on the same side of the probe; through screw-in and screw-out of the fastening bolts, thetwo ends of the probe are clamped and loosened; and through rotating the positioning members along the thread direction to adjust the distance between the two positioning members, the straightening of the probe is realized. The device is capable of realizing rapid change and straightening operations for the probe under the premise of ensuring the mounting precision and verticality of the probe; and the probe is high in mounting precision and is beneficial for accurate positioning of samples.

Description

technical field [0001] The invention relates to the technical field of neutron diffraction residual stress detection, in particular to a probe clamping device, which is used for sample positioning when neutron diffraction is used to measure the residual stress of materials and components. Background technique [0002] The rapid development of the country is inseparable from the support of the engineering field. Nowadays, the use of large components in various engineering projects has become more and more widespread and frequent, and once a safety accident occurs due to damage to large components, the loss in terms of manpower and material resources will be huge. [0003] According to relevant research, residual stress is one of the important factors that cause local or global failure of materials and components. At present, the methods that can detect the residual stress inside the component are mainly divided into destructive testing method and non-destructive testing meth...

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Problems solved by technology

[0006] In different experimental environments, it is necessary to use probes of different diameters and materials to calibrate the origin of diffraction measurement, and the probes currently used are installed using the same integrated clamping method as the sample fixture, and the position after one installation It cannot be adjusted, and there is a problem of cumbersome probe replacement in the actual operation process. In addition, because the probe has a large length-to-diameter ratio and is fixed at one end while the other end is suspended, it is easy to deform and break.

If the probe needs to be replaced frequently or the probe is broken during the experiment, it will seriously affect the progress of the experiment, greatly increase the preparation time of the experiment, and lead to a serious waste of precious neutron beam time, resulting in huge economic losses

At the same time, in the above probe-based sample positioning method, the installation accuracy and verticality of the probe must be guaranteed at all times, which puts high demands on the clamping and replacement process of the probe

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