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Non-contact measuring device and method for dynamic tension and twist of yarn

A non-contact measurement and tension technology, used in measurement devices, textiles and papermaking, instruments, etc., can solve the problems of time-consuming and laborious operation, inconvenient installation, and inconvenient use.

Inactive Publication Date: 2004-03-03
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main defect of this method is: the yarn needs to bypass the test rod during measurement, which is inconsistent with the movement state of the yarn during normal work, so the measured yarn tension is different from the actual tension of the yarn during normal spinning; The rod needs to be fixed on the spinning area on the frame, which is inconvenient to install, so it is not convenient to use on the production site
These methods, firstly, the measurement accuracy is not high enough, and the operation is time-consuming and laborious, and secondly, they can only measure the twist of the spun yarn, but cannot measure the dynamic twist of the yarn during the spinning process.

Method used

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  • Non-contact measuring device and method for dynamic tension and twist of yarn
  • Non-contact measuring device and method for dynamic tension and twist of yarn
  • Non-contact measuring device and method for dynamic tension and twist of yarn

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Example 1 - Measuring Spinning Dynamic Tension. There are two calculation formulas: ①P=T(ω / λ) 2 [1+0.5(λr m ) 2 ]②P=Tω 2 [πcos(α 0 / 2) / (2λKcosα 0 )] 2 . In the above formula: λ=[arcsin(r k / r m )] / h, K = ∫ 0 π / 2 ( 1 - k 2 sin 2 φ ) - 1 / 2 dφ , k = ( 1 - cos α 0 ) / ( 1 + ...

Embodiment 2

[0086] Embodiment 2 - automatic measurement of spinning dynamic twist with the method and device of the present invention. Method for automatic measurement of spinning dynamic twist:

[0087] 1. The speed sensor 18 is installed on the front roller of the spinning machine to measure the speed n of the front roller d (rev / min), then the yarn longitudinal velocity v=πn d D (m / min), wherein D is the front roller diameter (m); the speed sensor 14 is mounted on the ring plate to measure the speed n (rev / min) of the traveler.

[0088] 2. The measurement signals of the rotational speed sensor 14 and the rotational speed sensor 18 are input into the computer through the integrated data collector, and the computer automatically calculates the yarn twist at this moment according to the following formula: t w =n / v=n / (πnd D) (twist / m).

[0089] 3. The results are displayed on the display screen of the monitor, or printed out.

[0090] 25tex cotton yarn is spun on the FA506 spinning fra...

Embodiment 3

[0091] Embodiment 3--measuring the twist of spun yarn with the method of the present invention and its device. Method for measuring twist and diameter of spun yarn:

[0092] 1. Install the yarn to be tested on the yarn clamping frame, stretch the yarn tightly, and pay attention not to pull the yarn too tight or too loose.

[0093] 2. The CCD camera captures the yarn image, and the image information is stored in the computer through the image card.

[0094] 3. The image information in the computer is processed by smoothing, denoising, thresholding, etc. to extract image feature parameters: twist number N, yarn image length L 0 , Yarn image diameter d 0 .

[0095] 4. Carry out the calibration experiment, that is: any actual yarn length value is given, the yarn length value on the image is measured, and the equivalent coefficient D is calculated according to the following formula 2 = actual yarn length value / yarn length value on the image.

[0096] 5. Calculate the actual tw...

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Abstract

The present invention provides an equipment which is capable of measuring dynamic tension and twist of yarn in spinning process and measuring twist of spun yarn. Said invention also provides a non-contact method for implementing the above-mentioned measurement. Said invention is simple and reliable, its equipment is easy to install, can be extensively used in automatic and intelligent yarn production, and its measuring accuracy is high.

Description

technical field [0001] The invention relates to a spinning tension and twist measuring device and its measuring method, in particular to a yarn dynamic tension and twist measuring device and its measuring method in the spun yarn and twisting process of the spinning process, as well as measuring The method of spinning the twist of the yarn. Background technique [0002] The known measurement methods of spinning tension are all contact measurement methods at present, that is, let the yarn bypass the test rod, and under the action of the yarn tension, the test rod will produce a slight movement, thereby causing the capacitance, resistance or voltage in the test circuit to change. The change of the signal can be processed to indicate the change of the yarn tension, and the value of the yarn tension can be measured after calibration. For example, the Swiss-made R-3192 electronic yarn tension meter (Switzerland Rothschild: Electronic Tensionmeter R-3192) used in large quantities ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01H13/00G01D21/02
Inventor 梅顺齐向新柱杜雄星赵延雯吴世林余联庆张智明尤洪松
Owner WUHAN TEXTILE UNIV
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