Automatic centering clamp for rodlike sample for spectrograph

Abstract

The invention discloses an automatic centering clamp for a rodlike sample for a spectrograph. The automatic centering clamp comprises a substrate, an operating block, a butt clamp device, a bottom plate and a cover plate; a material hole, two first guiding straight chute openings and second grooves perpendicular to the first guiding straight chute openings are formed in the center of the substrate; the operating block comprises a main body part and an operating part; a trough and a second guiding straight chute opening are formed in the main body part; the butt clamp device comprises a spring,a first fixture block and a second fixture block; each of the first fixture block and the second fixture block is provided with a V shaped clamping part and a cylindrical hinge pin; the V shaped clamping part on the first fixture block and the V shaped clamping part on the second fixture block are arranged in a staggered manner in the axial direction of a to-be-clamped bar; a butt clamping devicelimiting groove is formed in the bottom plate or the substrate; the butt clamp device is embedded in the butt clamping device limiting groove; and the cylindrical hinge pins of the butt clamp deviceare arranged in the first guiding straight chute openings and the second guiding straight chute opening in a penetrating manner. The automatic centering clamp can realize automatic centering when clamping the rodlike sample.

Description

technical field [0001] The invention relates to the field of fixtures, in particular to an automatic centering fixture for a rod-shaped sample used in a spectrometer. Background technique [0002] The principle of spark direct-reading spectroscopic analysis is to make the sample change from solid to gaseous state under the action of electric spark excitation, and ionization of atoms and ions occurs. Since different elements have different absorption of spectra, the spectrum of electric spark is analyzed. Analysis, qualitative and quantitative analysis of the elements contained in the measured substance can be carried out according to the wavelength and intensity of the spectral line. [0003] Argon gas can make ionization easier, and drive away the oxygen, nitrogen and other gases released by the excitation of the sample, so as to keep the spectral intensity stable. Therefore, when using a spectrometer for testing, it must be carried out in a high-purity argon gas environmen...

AI Technical Summary

Problems solved by technology

When the sample to be tested is excited, the distance and position from the electrode will affect the final measurement result, so when performing quantitative analysis, the sample to be tested should be consistent with the conditions during calibration. However, when the diameter of the rod-shaped sample is smaller than the excitation hole diameter, it is difficult to keep the sample in the center of the excitation hole, it is easy to deviate from the center of the excitation hole, and it is impossible to ensure that the electrode is in a closed pure argon environment

[0005] At present, it is generally used to process smaller rod-shaped samples, such as slicing or hammering flattened, to make it into a sheet-like sample that can cover the excitation hole, so as to avoid the problem that the rod-shaped sample is difficult to center, but Such a process is cumbersome, time-consuming and labor-intensive

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