CN-121978101-A - Carbon fiber tow stretching wet method measurement device and method

CN121978101ACN 121978101 ACN121978101 ACN 121978101ACN-121978101-A

Abstract

The invention discloses a wet measurement device and a test method for stretching of carbon fiber tows, and relates to the technical field of carbon fibers. The system comprises a front image acquisition device, an ultrasonic device, a stretching device and a rear image acquisition device which are sequentially arranged, wherein the ultrasonic device is arranged between the front image acquisition device and the stretching device and comprises an ultrasonic solution tank for containing an organic solvent, an ultrasonic generating device is arranged in the ultrasonic solution tank and is used for enabling the organic solvent to vibrate, a conveying path of carbon fiber tows passes through an area where the ultrasonic solution tank contains the organic solvent, the front image acquisition device acquires pictures before stretching of the carbon fiber tows, and the rear image acquisition device acquires pictures after stretching of the carbon fiber tows. According to the invention, the sizing agent on the surface of the carbon fiber tows is dissolved under the action of an organic solvent and ultrasound, so that the widening quality is improved, and the testing efficiency and accuracy are improved through shooting by a front-mounted image acquisition device and a rear-mounted image acquisition device.

Inventors

LI MIN
ZHANG DUO
LI QINGHUI
ZHOU YUBO
WANG SHAOKAI
HOU LIYONG

Assignees

北京航空航天大学

Dates

Publication Date: 20260505
Application Date: 20260324

Claims (10)

1. The carbon fiber tow stretching wet method measurement device is characterized by comprising a front image acquisition device, an ultrasonic device, a stretching device and a rear image acquisition device which are sequentially arranged; The ultrasonic device is arranged between the front image acquisition device and the stretching device, and comprises an ultrasonic solution tank for containing an organic solvent, wherein an ultrasonic generating device is arranged in the ultrasonic solution tank and is used for oscillating the organic solvent; The front image acquisition device acquires a picture before the carbon fiber tows are widened, and the rear image acquisition device acquires a picture after the carbon fiber tows are widened.
2. The carbon fiber tow stretching wet method measurement device according to claim 1, wherein the ultrasonic generating device comprises at least two ultrasonic rollers, an ultrasonic bracket is arranged in the ultrasonic solution tank, the distance between the ultrasonic rollers on the ultrasonic bracket is adjustable, and the carbon fiber tows enter the ultrasonic solution tank and are output to the stretching device around the ultrasonic rollers.
3. The wet measurement device for stretching carbon fiber tows according to claim 1, wherein the stretching device comprises a plurality of first stretching rollers arranged, second stretching rollers are arranged in the direction in which the first stretching rollers output the carbon fiber tows, and the rear image acquisition device is arranged at least one of the second stretching rollers.
4. The wet measurement device for stretching of carbon fiber tows according to claim 3, further comprising a porous plate, wherein the porous plate is provided with a plurality of mounting holes, the number of the mounting holes is larger than the number of the first stretching rollers, and the first stretching rollers are detachably connected to the mounting holes.
5. A carbon fiber tow stretching wet measurement device according to claim 3, wherein a spray device is provided at the first stretching roller.
6. The wet measurement device for stretching of carbon fiber tows according to claim 3, wherein the first stretching roller and the second stretching roller are provided with stretching grooves with different widths at intervals.
7. The carbon fiber tow stretching wet method measurement device according to claim 1, further comprising an unreeling device and a reeling device, wherein a tension controller is arranged at the unreeling device.
8. The carbon fiber tow stretching wet measurement device according to claim 1, further comprising a guide assembly including a plurality of guide rollers for conveying the carbon fiber tows, at least one of the guide rollers being provided with the front image acquisition device.
9. The carbon fiber tow stretching wet method measurement device according to claim 1, wherein the front image acquisition device and the rear image acquisition device comprise a second upright post, a camera and an annular illuminating lamp, the camera is connected with the second upright post through a second adjustable connecting device, the annular illuminating lamp is connected with the second upright post through a third adjustable connecting device, the illumination end of the annular illuminating lamp and the imaging end of the camera face towards the carbon fiber tows, and the annular illuminating lamp is located between the camera and the carbon fiber tows.
10. A method for testing the stretching wet method of carbon fiber tows, which is applied to the device for testing the stretching wet method of carbon fiber tows according to claims 1-9, and comprises the following steps: S1, testing the width of the carbon fiber tows before stretching, namely conveying the carbon fiber tows through an ultrasonic generating device and a stretching device in sequence, wherein an organic solvent is not added in an ultrasonic liquid tank, the ultrasonic generating device is not started, and the carbon fiber tows are wound at a constant speed at a preset winding speed; S2, testing the width of the stretched fiber bundle, namely adding an organic solvent into an ultrasonic liquid tank after testing the width of the stretched fiber bundle, starting an ultrasonic generating device, and winding the carbon fiber bundle at a constant speed at a preset winding speed after the carbon fiber bundle runs stably; And S3, analyzing and processing the images acquired by the front image acquisition device and the rear image acquisition device by the control module to obtain the average width before and after the carbon fiber tows are stretched, and calculating the carbon fiber tows stretching ratio.

Description

Carbon fiber tow stretching wet method measurement device and method Technical Field The invention relates to the technical field of carbon fibers, in particular to a wet measurement device and a wet measurement method for stretching property of carbon fiber tows. Background Carbon fiber has become an indispensable high-performance fiber reinforcement in the fields of modern aerospace, pressure vessels and new energy by virtue of a series of excellent performances such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance and the like. Along with the high-speed growth of market demands, the refinement of the production process and the subsequent processing stability of the product are becoming the focus of industry attention. During secondary processing of carbon fibers (e.g., composite winding and layering), the stretching is one of the core process parameters that determine the quality of the final product. The stretching property refers to the width of a fiber bundle of carbon fibers after being stretched under specific conditions, reflects the distribution condition of the fibers in the using process of the carbon fibers, and has the advantages of poor wettability, low fiber strength conversion rate and reduced structural efficiency if the stretching ratio is too small, and is easy to form lap joints or gaps in the prepreg if the stretching ratio is too large or the width is uneven, so that the surface density uniformity and the appearance quality of the composite material are seriously affected. However, dry mechanical stretching techniques (e.g., low frequency vibration based spreader rolls) currently widely used in the industry have significant limitations. The method depends on macroscopic mechanical friction force, has large acting force scale and is difficult to finely control, fiber abrasion is easy to be aggravated, fuzziness is generated, the adhesion effect caused by the sizing agent on the surface of the carbon fiber is difficult to overcome, and the widening uniformity and the process stability are poor. In addition, the existing quality control means stay in an off-line manual measurement stage, only the static tow width is subjected to spot check, time and labor are wasted, the data size is small, and only the widened tow width is measured, so that the reliability of a test result is low. Therefore, how to provide a carbon fiber tow stretching wet method measurement device and a test method, which reduce the problems of fiber damage, high filament breakage rate and poor stretching uniformity caused by friction in the existing dry mechanical stretching process, improve the measurement efficiency and data measurement accuracy, and improve the reliability of the test result is a technical problem which needs to be solved by those skilled in the art. Disclosure of Invention Aiming at the defects and shortcomings in the prior art, the invention provides a carbon fiber tow stretching wet method measurement device and a measurement method, which are characterized in that a sizing agent on the surface of a carbon fiber tow is dissolved after an organic solvent and ultrasonic action, so that the viscosity of the carbon fiber tow is reduced, the dispersion and stretching of the carbon fiber tow are accelerated, and the stretching quality and the stretching efficiency are improved; the front image acquisition device and the rear image acquisition device continuously shoot a large number of images before and after the carbon fiber tows are widened in the test process, and the control module obtains the average width and the carbon fiber tows widening ratio before and after the carbon fiber tows are widened after analysis and treatment, so that the test efficiency and the accuracy of experimental results are effectively improved. In order to achieve the above purpose, the invention adopts the following technical scheme: the invention provides a carbon fiber tow stretching wet method measuring device, which comprises a front image acquisition device, an ultrasonic device, a stretching device and a rear image acquisition device which are sequentially arranged; The ultrasonic device is arranged between the front image acquisition device and the stretching device, and comprises an ultrasonic solution tank for containing an organic solvent, wherein an ultrasonic generating device is arranged in the ultrasonic solution tank and is used for oscillating the organic solvent; The front image acquisition device acquires a picture before the carbon fiber tows are widened, and the rear image acquisition device acquires a picture after the carbon fiber tows are widened. In one embodiment, the ultrasonic generating device comprises at least two ultrasonic rollers, an ultrasonic bracket is arranged in the ultrasonic solution tank, the distance between the ultrasonic rollers on the ultrasonic bracket is adjustable, and the carbon fiber tows enter the ult