Imaging background device for high precision tensile machine

Abstract

The invention discloses an imaging background device for a high precision tensile machine. The imaging background device comprises a shell, coiling disks and a guide rod, wherein the coiling disks are arranged in the shell; two ends of a central shaft of each coiling disk are fixed on the shell; a return coil spring accommodating bin and a background belt accommodating bin are arranged in each coiling disk, and are used for accommodating a return coil spring and a background belt; the inner end of the return coil spring is fixed on the central shaft and the outer end of the return coil springis fixed on a clapboard; the clapboard is arranged between the return coil spring accommodating bin and the background belt accommodating bin; the outer end of the background belt can be freely stretched, and extends out of the shell to be arranged at one end of the guide rod; and the other end of the guide rod is fixed on the shell. The imaging background device is convenient to use and easy to operate; and the used background belt is stable without shaking. The coiling disks for accommodating black and white background belts are arranged in the device, so that background walls with black and white base colors are convenient to change, and the operation is convenient.

Description

technical field [0001] The invention belongs to the field of machinery, and in particular relates to an imaging background device used on a high-precision tensile machine. Background technique [0002] The tensile testing machine is used for mechanical performance testing of wire and cable products. Among them, the elongation test of cable insulation and sheath is the most commonly used item. The high-precision tensile testing machine uses a non-contact video extensometer for measurement. The principle of the video extensometer is to use LED light to irradiate the sample, and then use a camera with a polarizer to image, and use analysis software to track the position of the mark. When the material is stretched, the camera will automatically track the mark and record it at the moment of fracture. The elongation is automatically calculated from the stretch distance. The camera is a black and white camera, and there are only three colors of black, white and gray under the le...

AI Technical Summary

Problems solved by technology

When the color of the sample is white, the black mark on it is the same color as the background, so that the system cannot accurately track the mark point

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