Yarn fatigue life testing device based on dynamic load conditions

Abstract

The invention relates to a yarn fatigue life detection device based on a dynamic load condition. The device comprises a rack. A tensioner for applying the tension to a yarn, an automatic warp stoppingdevice for detecting yarn breakage, a fixed friction piece in contact with the yarn in the yarn movement process, a simulated shedding structure in contact with the yarn in the yarn movement process,a simulated beating-up structure for simulating a beating-up motion, and a take-up device for realizing taking up of the yarn. According to the invention, a leading-in roller and the take-up device are arranged on the rack, one end of the yarn is fixedly connected to the take-up device and the other end is connected with a counter weight through the leading-in roller, and the counter weight provides the stable tension for the yarn continuously, so that the yarn is conveyed in one time in one direction and a problem of unstable pre-applied tension caused by connection of two ends of the yarnsis solved. A plurality of yarns can be detected simultaneously; and as long as the counter weight connected with each yarn has the equal mass, the tension on each yarn is ensure to be consistent, so that the detection precision is improved.

Description

Technical field: [0001] The invention belongs to the technical field of yarn performance detection, and in particular relates to a yarn fatigue life detection device under dynamic load conditions. Background technique: [0002] There is a phenomenon of yarn breakage during the weaving process. When a yarn breaks, the whole loom needs to be stopped, and the weaving will continue after the yarn is connected. It will form a defect that is easily observed by the naked eye. Therefore, the yarn breakage rate in the weaving process becomes a key factor affecting the efficiency and quality of cloth weaving. [0003] The traditional basis for judging the end-break rate in the yarn weaving process is the yarn tensile strength. Usually, a tensile strength tester is used to stretch the yarn until it breaks, detect the tensile strength of the yarn, and set Set a qualified value, and reach the strength of the yarn, it is considered that the breakage rate in the weaving process meets the ...

AI Technical Summary

Problems solved by technology

[0003] The traditional basis for judging the end-break rate in the yarn weaving process is the yarn tensile strength. Usually, a tensile strength tester is used to stretch the yarn until it breaks, detect the tensile strength of the yarn, and set Set a qualified value, and reach the strength of the yarn, it is considered that the breakage rate in the weaving process meets the requirements, but because the force on the yarn in the weaving process includes both tension and friction, and the friction exists in various forms, There are intermittent friction, continuous friction, impact friction, etc. Therefore, it is one-sided to judge the weaving performance of yarn only by a single tensile strength value, and cannot accurately judge the weaving performance of yarn

[0004] For this reason, the invention patent "A Yarn Tension Control Device and Method for Sizing Performance Evaluation" (Patent No.: 2018101381530) discloses a testing device that simultaneously rubs and stretches the yarn. Simulate the yarn weaving process to detect the fatigue life of the yarn during the weaving process (the number of hedging and weft beating), however, when the device is in use, the yarn needs to be connected end to end, and then move in the direction of the device , so there are many problems. Among them, it is difficult to control the yarn pretension when the yarn is knotted at the end, which makes it difficult to control the yarn tension. Especially when multiple yarns are detected at the same time, due to manual knotting, multiple yarns The pre-tension of each yarn is different, even if the tension adjustment device is used, the pre-tension of each yarn cannot be kept consistent, which leads to greater dispersion of the final test result data and inaccurate test results

[0005] Therefore, it is necessary to provide a structure that can effectively avoid the problem that the yarn pretension is difficult to control

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