Large-tow carbon fiber expansibility testing device and testing method
By combining airflow and mechanical vibration spinning techniques with a laser measuring instrument, the problem of uneven spinning and damage of large-tow carbon fiber was solved, achieving uniform spinning and quantitative measurement of carbon fiber, thus improving the efficiency and accuracy of prepreg production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-20
- Publication Date
- 2026-04-14
AI Technical Summary
Existing technologies lack devices for measuring the width of large-tow carbon fibers before and after spreading. Single spreading methods are difficult to guarantee spreading uniformity and are prone to damaging carbon fibers. Combined spreading methods do not meet the requirements of prepreg production and lack quantitative testing devices.
A combination of airflow and mechanical vibration yarn spreading methods, along with a laser measuring instrument, is used to achieve online continuous automatic measurement of carbon fiber bundles. The carbon fibers are uniformly spread through the airflow and mechanical vibration yarn spreading devices, and the width before and after yarn spreading is recorded using a laser measuring instrument.
It achieves uniform yarn spreading of large-tow carbon fibers, reduces damage, and enables continuous online quantitative measurement of the width before and after spreading, accurately evaluating the extensibility of carbon fibers and guiding the setting of prepreg production process parameters.
Smart Images
Figure CN121856529A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of carbon fiber performance testing technology, and in particular to a device and method for testing the extensibility of large-tow carbon fibers. Background Technology
[0002] Carbon fiber, due to its superior properties such as high specific strength, high specific modulus, fatigue resistance, and corrosion resistance, is widely used in aerospace, sporting goods, transportation, wind power generation, and other fields. Carbon fiber is generally classified into small-tow carbon fiber and large-tow carbon fiber according to the number of single filaments in its bundle; generally, carbon fiber with more than 48K single filaments is called large-tow carbon fiber. Compared with small-tow carbon fiber, large-tow carbon fiber is increasingly widely used due to its high cost-effectiveness and high component production efficiency. However, large-tow carbon fiber, due to its larger number of single filaments, higher basis weight, and coarser cross-section of the single fiber bundle, is not easy to unwind during processing (such as prepreg preparation, fabric weaving, and winding). This leads to easy friction between the fibers, causing single filament breakage, damage, and surface fuzzing. Furthermore, it makes it difficult for resin to penetrate the bundle, easily generating defects during composite material preparation, reducing the mechanical properties of the composite material, and limiting its widespread application.
[0003] Only through proper fiber spreading (also known as fiber spreading or filament spreading) can the carbon fibers fully impregnate with the resin, maximizing the reinforcing effect of large-tow carbon fibers. Fiber spreading has become a key process for large-tow carbon fibers, an essential step in achieving efficient and low-cost composite material preparation. Therefore, establishing a method for evaluating the scalability of large-tow carbon fibers through fiber spreading, based on the characteristics of large tows, and thereby improving the level of testing and evaluation of the process characteristics of large-tow carbon fibers, is a technical problem that urgently needs to be solved to expand the application of large-tow carbon fibers. Carbon fiber spreading refers to the process of widening and homogenizing the carbon fiber tow along its width direction and thinning it along its thickness direction using certain methods. Current methods for spreading carbon fiber tows mainly include mechanical / vibration spreading, ultrasonic spreading, airflow spreading, electrostatic spreading, and combinations thereof. Among these, mechanical vibration spreading is currently the most widely used spreading method for preparing prepregs.
[0004] Current methods for unwinding and testing large-tow carbon fibers have the following main shortcomings: (1) Current patents on large-tow carbon fiber spreading mainly focus on spreading devices for different spreading methods, and lack a width measurement device for large-tow carbon fiber before and after spreading. (2) Most of them are single yarn spreading methods, and most of them are mechanical yarn spreading methods. It is difficult to ensure uniform yarn spreading for large tow carbon fibers, and mechanical yarn spreading methods are prone to causing great damage to large tow carbon fibers. (3) Existing patents propose combined yarn spreading methods (such as mechanical yarn spreading and ultrasonic yarn spreading combination) which do not conform to the actual production situation of large tow carbon fiber prepreg (ultrasonic yarn spreading requires carbon fiber to pass through a solution of a certain concentration, which is absolutely not allowed in prepreg preparation) and are unlikely to have engineering guidance significance.
[0005] (4) There is no dedicated quantitative testing device for the extensibility testing of large tow carbon fibers in China, especially a lack of methods for online continuous measurement of the extensibility of large tow carbon fibers for combined yarn spreading methods.
[0006] Therefore, in order to reduce the damage to carbon fibers during the unwinding process, a single unwinding method is insufficient to fully unwind large-tow carbon fibers. It is particularly necessary to develop a combined unwinding method that conforms to the actual production process of large-tow carbon fiber prepreg, as well as a test method for the width of carbon fiber tows before and after unwinding. Summary of the Invention
[0007] This application provides a testing device and method for testing the scalability of large-tow carbon fibers to solve the problems mentioned in the background art.
[0008] In a first aspect, this application provides a large-tow carbon fiber scalability testing device, including an airflow spreading device, a mechanical vibration spreading device, a front width measuring device, and a rear width measuring device; the airflow spreading device is used to continuously move along a direction perpendicular to the plane of the carbon fiber filament and to blow hot air onto the carbon fiber filament; the mechanical vibration spreading device is used to spread the carbon fiber filament through mechanical vibration and heating; the front width measuring device is used to automatically identify and record the width of the carbon fiber filament before spreading; and the rear width measuring device is used to automatically identify and record the width of the carbon fiber filament after spreading.
[0009] Furthermore, the airflow yarn spreading device includes a hot air gun and a hot air gun motion module. The hot air gun is used to blow out hot air at a constant airflow, and the hot air gun motion module is used to adjust the effect of the hot air blowing by adjusting the relative position of the hot air gun nozzle and the yarn bundle, the blowing angle, the blowing motion frequency, and the blowing motion amplitude.
[0010] Furthermore, the heat gun has a power of 1600W and adopts stepless temperature control, with a temperature control range from room temperature to 600℃.
[0011] Furthermore, the vibration frequency of the hot air gun is 0.1~300 times / min, driven by a servo motor, and digitally set and displayed through a human-machine interface.
[0012] Furthermore, the left and right movement amplitude of the hot air gun is set to five adjustable levels: 30mm, 25mm, 20mm, 15mm, and 10mm.
[0013] Furthermore, the height of the hot air gun is adjustable by 25cm, and the angle adjustment range is 45~135° between the fiber running direction and the blowing direction.
[0014] Furthermore, the mechanical vibration yarn spreading device includes a yarn spreading roller group and a mold temperature controller. The yarn spreading roller group includes a guide roller, upper and lower vibration rollers, left and right vibration rollers, and a lifting roller. The upper and lower vibration rollers and the left and right vibration rollers have vibration and heating functions, and the lifting roller has lifting and heating functions.
[0015] Furthermore, both the front width measuring device and the rear width measuring device are laser measuring instruments with a width measuring range of 250mm and an accuracy of ±0.1mm.
[0016] Furthermore, it also includes an unwinding device and a winding device; the unwinding device is used to place the carbon fiber bundle and has a tension adjustment device to provide unwinding tension for the carbon fiber bundle unwinding process; the winding device is used to pull the carbon fiber bundle to run and wind the carbon fiber bundle.
[0017] Secondly, this application provides a method for testing the extensibility of large-tow carbon fibers, which is implemented using the large-tow carbon fiber extensibility testing device described above; The method for testing the scalability of large-tow carbon fibers includes: Large tow carbon fibers are sequentially passed through an airflow yarn spreading device, a front width measuring device, a mechanical vibration yarn spreading device, and a rear width measuring device. Set the parameters of the airflow yarn spreading device and the mechanical vibration yarn spreading device and start them to hot blow and spread the large tow carbon fiber. After the large tow carbon fiber has been run to the set length, the front width measuring device and the rear width measuring device record the set number of times the carbon fiber tow width is set before and after the yarn is spread at a set interval. Calculate the average width of the carbon fiber bundles before and after spreading.
[0018] The above-mentioned technical solution of this application has the following advantages: The large-tow carbon fiber spreadability testing device and method provided in this application overcome the problems of uneven spreadability and damage to carbon fibers caused by single spreadability methods, as well as the lack of quantitative testing methods. It achieves uniform spreadability of large-tow carbon fibers through a combination of mechanical vibration spreadability and airflow spreadability (referred to as the vibration-jet spreadability method), and uses a laser sensor to achieve online, continuous, and automatic measurement of the width of the large-tow carbon fibers before and after spreadability. The testing device of this application can comprehensively test and characterize the influence of multiple parameters on the spreadability of carbon fiber tows, and the method can objectively and accurately evaluate the spreadability of large-tow carbon fibers. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the structure of the large-tow carbon fiber expansion testing device provided in the embodiments of this application.
[0021] Reference numerals: 1—Unwinding device; 2—Airflow yarn spreading device; 3—Carbon fiber bundle; 4—Mechanical vibration yarn spreading device; 5—Guide roller; 6—Upper and lower vibrating rollers; 7—Lifting roller; 8—Front and left / right vibrating rollers; 9—Lifting roller; 10—Rear and left / right vibrating rollers; 11—Lifting roller; 12—Rear width measuring device; 13—Front width measuring device; 14—Setting roller; 15—Rewinding device. Detailed Implementation
[0022] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and processes are omitted so as not to obscure the description of this application with unnecessary detail.
[0023] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.
[0024] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0025] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. "A plurality" means "two or more."
[0026] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.
[0027] This application provides a device for testing the scalability of large-tow carbon fibers, such as... Figure 1 As shown, it includes five parts: unwinding device 1, airflow yarn spreading device 2, mechanical vibration yarn spreading device 4, width measuring device 12, and winding device 14.
[0028] Large-tow carbon fibers are unwound under a certain unwinding tension, at a certain speed, and with a certain frequency and amplitude, while being assisted by hot air blowing. The width of the carbon fiber tow before and after unwinding is measured. The role of each part in the process is described below according to the direction of carbon fiber tow movement.
[0029] The unwinding device 1 is used to place the carbon fiber yarn barrel, and the tension is provided by the reverse rotation of the servo motor. The tension is adjustable.
[0030] The airflow yarn spreading device 2 is located at the rear end of the unwinding device and consists of a hot air gun with adjustable angle, height, frequency, and amplitude. By continuously moving the hot air gun, the carbon fiber tow 3 is heated, and the sizing agent on the surface of the carbon fiber tow 3 softens under the hot air blowing, which helps the carbon fiber spread.
[0031] The mechanical vibration yarn spreading device 4 consists of a yarn spreading roller assembly and a mold temperature controller. The yarn spreading roller assembly is a multi-axial mechanical vibration yarn spreading device, arranged from front to back according to the carbon fiber movement direction: guide roller 5, upper and lower vibrating rollers 6, front lifting roller 7, front left and right vibrating rollers 8, lifting roller 9, rear left and right vibrating rollers 10, and rear lifting roller 11. The guide roller 5 is the roller before the upper and lower vibrating rollers 6 after the carbon fiber bundle 3 passes through the yarn guide hole, preventing the bundle from sticking, deforming, or twisting due to vibration during up-and-down vibration. The upper and lower vibrating rollers 6 are heated and vibrate up and down according to a set frequency and amplitude, changing the bundle tension and thinning the bundle. The front left and right vibrating rollers 8 and the rear left and right vibrating rollers 10 are heated and vibrate left and right according to a set frequency and amplitude, spreading the bundle left and right. The lifting rollers 7, 9, and 11 are adjusted vertically by a servo motor, changing the wrap angle of the bundle on the vibrating rollers.
[0032] The front width measuring device 13 and the rear width measuring device 12 automatically identify and record the width of the carbon fiber bundle before and after spreading using a laser measuring instrument.
[0033] The winding device 15 pulls the carbon fiber bundle to run, and winds the unrolled carbon fiber bundle 3 after it passes through the setting roller 14.
[0034] Carbon fiber tow 3-yarn width test procedure: Place yarn drum -- Unwind -- Measure width before yarn unfolding -- Unwind -- Measure width after yarn unfolding -- Rewind.
[0035] The testing principle of the large-tow carbon fiber expansion testing device proposed in this application embodiment is as follows: the large-tow carbon fiber is unwound under a certain unwinding tension, at a certain speed, and at a certain vibration frequency and amplitude, while the unwinding is assisted by hot air blowing. The width of the carbon fiber filament before and after unwinding is measured.
[0036] This application proposes a large-tow carbon fiber scalability testing device, which achieves uniform scaling of large-tow carbon fibers through a combination of mechanical vibration scaling and airflow scaling. A laser sensor is used to continuously and automatically measure the width of the large-tow carbon fibers before and after scaling. It mainly consists of five parts: an unwinding device, an airflow scaling device, a mechanical vibration scaling device, a width measuring device, and a winding device. See details below. Figure 1 .
[0037] Unwinding Device: The unwinding device holds a spool of carbon fiber and includes a tension adjustment mechanism to provide unwinding tension for the carbon fiber tow. Tension is provided by a 400W servo motor operating in reverse. The servo motor adjusts its output torque in real time based on tension feedback data to ensure that the tension on the large tow of carbon fiber matches the set value (i.e., unwinding will only succeed when the tension of the pulled tow exceeds the set tension value; if the pulling force is too weak, unwinding will fail). The tension of the unwinding device is adjustable, with a damping range of 0.5N to 10N and a graduation value of 0.1N.
[0038] The airflow yarn spreading device consists of a hot air gun and a moving module. The hot air gun blows hot air at a constant volume, and the moving module adjusts the effect of the hot air blowing by changing the relative position of the gun nozzle and the yarn bundle, the blowing angle, the blowing frequency, and the blowing amplitude. By continuously moving the hot air gun perpendicular to the plane of the carbon fiber yarn bundle, the sizing agent on the surface of the carbon fiber yarn bundle softens under the action of the hot air, thus facilitating yarn spreading. The hot air gun has a power of 1600W and uses stepless temperature control, with a temperature range from room temperature to 600℃. The vibration frequency of the hot air gun (0.1~300 times / min) is driven by a servo motor and can be digitally set and displayed through a human-machine interface (HMI) for precise control. The left and right movement amplitude of the hot air gun can be manually switched according to process requirements, providing five adjustable levels: 30mm, 25mm, 20mm, 15mm, and 10mm. In addition, the structure of the hot air gun supports manual adjustment of angle and height, which facilitates quick positioning and optimization of angle and process parameters. The height can be adjusted by about 25cm, and the angle adjustment range is about 45~135° between the fiber running direction and the blowing direction (too large or too small an angle will result in too little airflow when the hot air blows onto the fiber).
[0039] Mechanical vibration yarn spreading device: Composed of a yarn spreading roller assembly and a mold temperature controller, it spreads carbon fiber tows through mechanical vibration and heating. The yarn spreading roller assembly is a multi-axial mechanical vibration yarn spreading device, consisting of 7 spreading rollers with a diameter of φ100mm and a surface roughness of 1.9μm±0.2μm, including 1 guide roller, 1 upper and lower vibrating roller, 2 left and right vibrating rollers, and 3 lifting rollers. The vibrating rollers have vibration and heating functions, and the lifting rollers have lifting and heating functions. Following the direction of carbon fiber movement, from front to back, the sequence is: guide roller, upper and lower vibrating roller, front lifting roller, front left and right vibrating roller, lifting roller, rear left and right vibrating roller, and rear lifting roller.
[0040] Width measuring device: Consists of two laser measuring instruments (one before and one after the carbon fiber bundle is unfurled). The laser measuring instruments can automatically identify and record the width of the carbon fiber bundle before and after unfurling, with a measurement range of 250mm and an accuracy of ±0.1mm.
[0041] Winding device: pulls the carbon fiber bundle and winds it up. It provides power for automatic winding, can continuously move the carbon fiber and collect the unwinding carbon fiber bundle, and has an automatic stop function when the preset length is reached.
[0042] The test method for testing the tow spread of large-tow carbon fibers using the large-tow carbon fiber spreadability testing device described above is as follows: Step 1: Place a large tow of carbon fiber onto the unwinding device 1.
[0043] Step 2: Pass the large tow of carbon fiber through the airflow spreading device 2, guide roller 5, upper and lower vibrating rollers 6, lifting roller 7, front left and right vibrating rollers 8, lifting roller 9, rear left and right vibrating rollers 10 and lifting roller 11 in sequence, and fix it on the winding device 15. Take care to avoid damaging the carbon fiber tow and do not allow the fibers to be flipped or twisted.
[0044] Step 3: Set the parameters of the carbon fiber extensibility test device according to the recommended values in Table 1. The parameters will vary depending on the type of carbon fiber and sizing agent.
[0045] Table 1 Recommended values for parameters of the large-tow carbon fiber scalability testing apparatus Step 4: Start the mechanical vibration yarn spreading device 4 and start the winding device 15.
[0046] Step 5: After the large carbon fiber bundle has traveled at least 2m, the front width measuring device 13 and the rear width measuring device 12 record the width of the carbon fiber bundle before and after the yarn spreading 20 times at intervals of 0.5 meters.
[0047] Step 6: Calculate the average width of the unfolded filament bundle before unfolding, denoted as L1, accurate to 0.1mm; calculate the average width of the unfolded filament bundle after unfolding, denoted as L2, accurate to 0.1mm.
[0048] The following is a description through specific embodiments.
[0049] Example 1 A yarn spool wound with carbon fiber A-48K is installed on the unwinding device 1. The carbon fiber bundle passes sequentially through guide roller 5, upper and lower vibrating rollers 6, lifting roller 7, front left and right vibrating rollers 8, lifting roller 9, rear left and right vibrating rollers 10, and lifting roller 11, and is then fixed on the winding device 15. The yarn spreading parameters are set, and heating is started. After each roller reaches the set temperature, yarn spreading and traction are initiated. Once the bundle runs stably, automatic recording is started. After at least 20 data points are automatically recorded, the fiber bundle operation is stopped. The test data for this carbon fiber are shown in Table 2.
[0050] Table 2 Results of A-48K carbon fiber ductility test Example 2 A yarn spool wound with carbon fiber B-50K is installed on the unwinding device 1. The carbon fiber bundle passes sequentially through guide roller 5, upper and lower vibrating rollers 6, lifting roller 7, front left and right vibrating rollers 8, lifting roller 9, rear left and right vibrating rollers 10, and lifting roller 11, and is fixed on the constant speed winding device 15. The yarn spreading parameters are set, and heating is started. After each roller reaches the set temperature, yarn spreading and traction are started. After the bundle runs stably, automatic recording is started. After at least 20 data points are automatically recorded, the fiber bundle operation is stopped. The test data for this carbon fiber are shown in Table 3.
[0051] Table 3. Results of B-50K Carbon Fiber Extensibility Test The large-tow carbon fiber expansion testing device and testing method provided in this application have the following advantages: (1) They absorb the advantages of different yarn spreading methods and make up for the shortcomings of using a single yarn spreading method. Based on the combination of mechanical vibration yarn spreading and airflow yarn spreading, they achieve uniform yarn spreading of large-tow carbon fibers, with less damage to carbon fibers and high yarn spreading efficiency; (2) They can comprehensively test and characterize the influence of various parameters (tension, speed, temperature, vibration frequency and amplitude, airflow temperature and frequency, etc.) on the expansion of large-tow carbon fibers; (3) They can continuously and quantitatively measure the expansion of large-tow carbon fibers online in real time; (4) They can reflect the actual large-tow carbon fiber prepreg production process, accurately analyze the influence of carbon fiber yarn spreading process parameters on expansion, and accurately guide the setting and adjustment of large-tow carbon fiber prepreg production process parameters.
[0052] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application.
[0053] It should be clarified that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. This application is not limited to the specific structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.
[0054] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A device for testing the extensibility of large-tow carbon fibers, characterized in that, The device includes an airflow yarn spreading device, a mechanical vibration yarn spreading device, a front width measuring device, and a rear width measuring device. The airflow yarn spreading device is used to continuously move along a direction perpendicular to the plane of the carbon fiber bundle and blow hot air onto the carbon fiber bundle. The mechanical vibration yarn spreading device is used to spread the carbon fiber bundle through mechanical vibration and heating. The front width measuring device is used to automatically identify and record the width of the carbon fiber bundle before spreading. The rear width measuring device is used to automatically identify and record the width of the carbon fiber bundle after spreading.
2. The large-tow carbon fiber scalability testing device as described in claim 1, characterized in that, The airflow yarn spreading device includes a hot air gun and a hot air gun motion module. The hot air gun is used to blow out hot air at a constant air volume. The hot air gun motion module is used to adjust the effect of hot air blowing by adjusting the relative position of the hot air gun nozzle and the yarn bundle, the blowing angle, the blowing motion frequency, and the blowing motion amplitude.
3. The large-tow carbon fiber scalability testing device as described in claim 2, characterized in that, The heat gun has a power of 1600W and uses stepless temperature control, with a temperature control range from room temperature to 600℃.
4. The large-tow carbon fiber scalability testing device as described in claim 2, characterized in that, The vibration frequency of the hot air gun is 0.1~300 times / min, driven by a servo motor, and digitally set and displayed through a human-machine interface.
5. The large-tow carbon fiber scalability testing device as described in claim 2, characterized in that, The left and right movement amplitude of the hot air gun is adjustable in five levels: 30mm, 25mm, 20mm, 15mm, and 10mm.
6. The large-tow carbon fiber scalability testing device as described in claim 2, characterized in that, The height of the hot air gun is adjustable by 25cm, and the angle adjustment range is 45~135° between the fiber running direction and the blowing direction.
7. The large-tow carbon fiber scalability testing device as described in claim 1, characterized in that, The mechanical vibration yarn spreading device includes a yarn spreading roller assembly and a mold temperature controller. The yarn spreading roller assembly includes a guide roller, upper and lower vibration rollers, left and right vibration rollers, and a lifting roller. The upper and lower vibration rollers and the left and right vibration rollers have vibration and heating functions, and the lifting roller has lifting and heating functions.
8. The large-tow carbon fiber scalability testing device as described in claim 1, characterized in that, Both the front and rear width measuring devices are laser measuring instruments with a width measuring range of 250 mm and an accuracy of ±0.1 mm.
9. The large-tow carbon fiber scalability testing device as described in claim 1, characterized in that, It also includes an unwinding device and a winding device; the unwinding device is used to place the carbon fiber bundle and has a tension adjustment device to provide unwinding tension for the carbon fiber bundle unwinding process; the winding device is used to pull the carbon fiber bundle and wind the carbon fiber bundle.
10. A method for testing the scalability of large-tow carbon fibers, characterized in that, This is achieved using the large-tow carbon fiber scalability testing device as described in any one of claims 1 to 9; The method for testing the scalability of large-tow carbon fibers includes: Large tow carbon fibers are sequentially passed through an airflow yarn spreading device, a front width measuring device, a mechanical vibration yarn spreading device, and a rear width measuring device. Set the parameters of the airflow yarn spreading device and the mechanical vibration yarn spreading device and start them to hot blow and spread the large tow carbon fiber. After the large tow carbon fiber has been run to the set length, the front width measuring device and the rear width measuring device record the set number of times the carbon fiber tow width is set before and after the yarn is spread at a set interval. Calculate the average width of the carbon fiber bundles before and after spreading.