Synchronous online symmetric stretching device

Abstract

The invention provides a synchronous online symmetric stretching device. The synchronous online symmetric stretching device comprises a symmetric stretching mechanism, a transmission mechanism, a supporting frame and a programmable logic controller, wherein the symmetric stretching mechanism is mounted in the supporting frame, one end of the symmetric stretching mechanism is connected with the transmission mechanism, and the transmission mechanism is connected with the programmable logic controller. The symmetric stretching mechanism comprises two screw-nut pairs, sliders and press plates, the screw-nut pairs are mounted on one side in the supporting frame, each screw-nut pair comprises a screw with two threads opposite in screwing direction and two nuts fittingly in sleeving joint with the two threads, and the ends, on the same side, of the screws pass through the supporting frame to be positioned on the outer side thereof. The synchronous online symmetric stretching device can be disposed in a specific test instrument (such as an x-ray diffractometer and raman spectrometer) and is capable of achieving synchronous online symmetric stretching strictly so as to improve accuracy of detection results.

Description

technical field [0001] The invention belongs to the technical field of supporting stretching equipment for performance testing of polymer materials, and in particular relates to a synchronous online symmetrical stretching device used in testing equipment such as X-ray diffractometers and Raman spectrometers. Background technique [0002] By studying the evolution of the ordered structure of materials at different scales (grain size, lamellae size, unit cell size, molecular chain conformation, molecular chain arrangement in the amorphous region, etc.) The corresponding relationship between certain macroscopic properties of materials can provide a theoretical basis for the processing technology and application methods of materials. However, the existing conventional stretching machines are not only bulky, but cannot be used in conjunction with equipment for testing ordered structures of different scales (such as X-ray diffractometers, Raman spectrometers, etc.) The evolution ...

AI Technical Summary

Problems solved by technology

However, the existing conventional stretching machines are not only bulky, but cannot be used in conjunction with equipment for testing ordered structures of different scales (such as X-ray diffractometers, Raman spectrometers, etc.) The evolution of the crystal form during the stretching process, the detection of microscopic morphology changes, etc.), and they are all uniaxial stretching. If they are matched with the equipment for testing ordered structures of different scales, the position of the test point will vary with the stretching during the test. The test point cannot be reset accurately due to changes during the stretching process, resulting in the problem that the test result is not accurate enough

Therefore, the offline detection method is usually used for detection at present, but the offline detection method has the following disadvantages: 1) The stress relaxation of the sample will inevitably occur during the transfer process after stretching, resulting in changes in the material structure, which cannot truly reflect a certain size of the material Correspondence between the structure and a certain macroscopic property of the material; 2) Non-continuity detection of the evolution process of the material structure

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