Sample preparation device and method for reducing gel content of carbon fiber multifilament tensile sample strip

Abstract

The invention discloses a sample preparation device and method for reducing the gel content of a carbon fiber multifilament tensile sample strip, and the sample preparation device for reducing the gel content of the carbon fiber multifilament tensile sample strip comprises a filament releasing roller, a filament guiding device, a plurality of filament spreading rollers, a plurality of gel spraying heads, a rolling furling device and a gel extruding and curing device. The yarn releasing roller is connected with a carbon fiber bundle yarn and is used for leading out the carbon fiber bundle yarn; the filament guiding device is located on the end face of one side of the filament releasing roller, the multiple filament spreading rollers are located on the end face of one side of the filament guiding device and used for spreading the carbon fiber bundles, the multiple glue spraying heads are located on the multiple end faces of the filament spreading rollers and used for spraying the carbon fiber bundles located on the filament spreading rollers, and the rolling folding device is located on the end faces of one sides of the multiple filament spreading rollers. According to the method, a glue spraying method is adopted to replace a traditional glue dipping method, the glue using amount is reduced, an extrusion method is adopted to replace a traditional glue scraping method, more glue is removed, and therefore the glue content of the carbon fiber multifilament tensile sample strip is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of material performance testing, and in particular relates to a sample preparation device and method for reducing the glue content of a carbon fiber multifilament drawing sample strip. Background Art

[0002] Carbon fiber is a high-performance synthetic material with a carbon content of more than 90%. It is usually made by high-temperature cracking of organic fibers and has a diameter of about 5-10μm. Carbon fiber is "lightweight and high-strength" with a specific gravity of only about 1 / 5 of that of steel and a strength of 5-7 times that of steel. It has the characteristics of high temperature resistance, corrosion resistance, and good conductivity. It is an ideal choice to replace traditional metal materials and is one of the strongest commercial fibers known to date. It is widely used in aerospace, automotive, sports equipment and other fields.

[0003] The tensile performance of carbon fiber multifilament is an important indicator for carbon fiber factory inspection. The test of the tensile performance of carbon fiber multifilament is closely related to the sample preparation conditions. The glue content of the sample has an important influence on the performance of the sample. Too high glue content is prone to form more defects, resulting in a decrease in sample performance and reducing the accuracy and stability of the test results.

[0004] The current mainstream sample preparation method is the sample preparation method disclosed by Japan's Toray. The samples prepared by this method have a high glue content. The main reason is that: after the sample passes through the glue dipping tank, it is completely immersed in glue. The sample is in a "glue-rich" state, and then the excess glue is removed by "scraping glue". This method has too much glue in the early stage, and the subsequent glue removal method removes less glue. The final carbon fiber multifilament stretched sample has a high glue content.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a sample preparation device and method for reducing the glue content of carbon fiber multifilament drawing spline, which can replace the traditional dipping method with a spraying method to reduce the amount of glue used, and replace the traditional scraping method with an extrusion method to remove more glue, thereby reducing the glue content of the carbon fiber multifilament drawing spline.

[0007] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows:

[0008] A sample preparation device for reducing the glue content of carbon fiber multifilament stretching spline, comprising a wire-releasing roller, a wire-guiding device, a plurality of wire-spreading rollers, a plurality of glue-spraying heads, a rolling and gathering device, and a glue-extruding and curing device. The wire-releasing roller is connected to the carbon fiber bundle and leads the carbon fiber bundle; the wire-guiding device is located on one side end face of the wire-releasing roller, a plurality of wire-spreading rollers are located on one side end face of the wire-guiding device, and the carbon fiber bundle is spread; a plurality of glue-spraying heads are located on a plurality of end faces of the wire-spreading roller, and the carbon fiber bundle on the wire-spreading roller is sprayed; the rolling and gathering device is located on a plurality of end faces of the wire-spreading rollers; the glue-extruding and curing device is located on a side end face of the rolling and gathering device, and the glue-extruding and curing device clamps the carbon fiber bundle.

[0009] In one or more embodiments of the present invention, the wire guiding device is provided with a wire guiding hole, and the carbon fiber bundle passes through the wire guiding hole.

[0010] In one or more embodiments of the present invention, the plurality of glue spray heads are three, wherein a pair of the glue spray heads are located at the upper end surface of the wire spreading roller, and another glue spray head is located at the bottom end surface of the wire spreading roller.

[0011] In one or more embodiments of the present invention, a plurality of the wire spreading rollers form a V shape.

[0012] In one or more embodiments of the present invention, the plurality of rolling and gathering devices each include a pair of rolling wheels and a rolling assembly rotation shaft, a central mold hole is provided on one end face of the rolling and gathering device, and the pair of rolling wheels compress the carbon fiber bundles.

[0013] In one or more embodiments of the present invention, the glue extrusion and curing device includes a pair of glue extrusion and curing plates, and the pair of glue extrusion and curing plates are provided with glue extrusion holes.

[0014] In one or more embodiments of the present invention, the glue extrusion hole is trumpet-shaped, and the end surface of the glue extrusion hole that contacts the rolling and gathering device has a larger opening.

[0015] In one or more embodiments of the present invention, a clamping and traction device is provided on one end face of the glue extrusion and curing device, and the clamping and traction device drives the carbon fiber bundle to move.

[0016] A method for a sample preparation device for reducing the rubber content of a carbon fiber multifilament drawing spline, comprising the following steps;

[0017] S1, unfolding the gathered carbon fiber bundles; drawing the carbon fiber bundles out from the pay-off roller, and sequentially entering the wire guide device and the wire spreading roller for unfolding;

[0018] S2, uniform spraying: using multiple spray heads to atomize the resin glue liquid and spray it evenly onto the surface of the unfolded carbon fiber bundle;

[0019] S3, gathering; introducing the sprayed carbon fiber bundle into a rolling gathering device for re-gathering;

[0020] S4, squeezing out excess glue; passing the re-gathered carbon fiber bundles in the above step S3 through a glue extrusion and curing device to draw a hole die, further shrinking and gathering, increasing the tendency of the carbon fiber multifilaments, and making the fibers further arranged axially to squeeze out excess glue;

[0021] S5, pressure-maintaining curing; using microwave curing to improve curing efficiency and reduce sample defects;

[0022] S6, making finished products; post-processing the cured specimens obtained in the above step S to eliminate internal stress.

[0023] In one or more embodiments of the present invention, the shapes of the carbon fiber bundles entering the wire guide device, the wire spreading roller, the rolling and gathering device and the glue extrusion and curing device in sequence are all different, including first-region carbon fiber bundles, second-region carbon fiber bundles, third-region carbon fiber bundles and fourth-region carbon fiber bundles. The unfolded area of ​​the carbon fiber bundles in the second region is larger than the unfolded area of ​​the carbon fiber bundles in the first region, the unfolded area of ​​the carbon fiber bundles in the third region is smaller than the unfolded area of ​​the carbon fiber bundles in the first region, and the unfolded area of ​​the carbon fiber bundles in the fourth region is smaller than the unfolded area of ​​the carbon fiber bundles in the third region.

[0024] Compared with the prior art, the sample preparation device and method for reducing the glue content of carbon fiber multifilament drawing spline of the present invention has the following benefits:

[0025] 1) The method of spraying glue and impregnation is adopted, and the carbon fiber multifilament carries less glue than the traditional dipping method; the carbon fiber multifilament carries less glue in the initial state of this method, and more glue is removed during the glue squeezing process, so the sample prepared by this method contains less glue than the traditional sample preparation method.

[0026] 2) In the traditional dipping method, the fiber is completely immersed in the resin liquid, and the fiber is easily damaged by the tension of the liquid. In this method, the tension of the spray-infiltrated liquid is smaller, which can reduce fiber damage.

[0027] 3) The traditional curing method is to maintain a certain tension on the impregnated multifilament and cure it in an oven. During the curing process, there is only tension along the linear direction of the fiber, and there is no constraint in the direction perpendicular to the linear direction. The fiber is easy to diffuse around, and the fiber bundles are loosely arranged, which is easy to form defects inside. This method maintains pressure for curing, and there is constraint in the direction perpendicular to the linear direction during the curing process, which can reduce internal defects of the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic structural diagram of a sample preparation device for reducing the rubber content of a carbon fiber multifilament stretched strip according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 A schematic diagram of the structure at A;

[0031] Figure 3 is a schematic diagram of a carbon fiber bundle in a processing state according to an embodiment of the present invention;

[0032] Figure 4 A cross-sectional view of a glue extrusion and curing device in one embodiment of the present invention;

[0033] Figure 5 is a cross-sectional view of a rolling and retracting device in one embodiment of the present invention;

[0034] Figure 6 is a cross-sectional view of a first region carbon fiber bundle in one embodiment of the present invention;

[0035] Figure 7 is a cross-sectional view of a carbon fiber bundle in the second region in one embodiment of the present invention;

[0036] Figure 8 is a cross-sectional view of a carbon fiber bundle in a third region in one embodiment of the present invention;

[0037] Fig. 9 FIG. 4 is a cross-sectional view of a fourth region carbon fiber bundle in one embodiment of the present invention.

[0038] Description of main reference numerals:

[0039] 1-wire release roller, 2-wire guiding device, 3-glue spray head, 4-wire spreading roller, 5-rolling and gathering device, 51-rolling component rotation axis, 6-glue extrusion and curing device, 61-glue extrusion hole, 62-glue extrusion and curing device, 7-clamping and traction device, 8-carbon fiber bundles, 9-carbon fiber bundles in the first area, 10-carbon fiber bundles in the second area, 11-carbon fiber bundles in the third area, 12-carbon fiber bundles in the fourth area. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0041] like Figure 1 As shown, a sample preparation device for reducing the glue content of carbon fiber multifilament drawing spline in one embodiment of the present invention includes a wire release roller 1, a wire guide device 2, a rolling and gathering device 5, a glue extrusion and curing device 6, a plurality of wire spreading rollers 4 and a plurality of glue spraying heads 3, which realizes the use of a glue spraying method to replace the traditional glue dipping method to reduce the amount of glue used, and an extrusion method to replace the traditional glue scraping method to remove more glue, thereby reducing the glue content of the carbon fiber multifilament drawing spline.

[0042] The sample used in this embodiment is a 48K large-tow carbon fiber sample. The carbon fiber multifilament tensile spline prepared by the traditional sample preparation method has a high rubber content, defects such as hollowness in the middle of the spline, low tensile strength, large discreteness of data results, and poor stability.

[0043] like Figure 1 As shown, the unwinding roller 1 is connected to the carbon fiber bundle 8 and draws out the carbon fiber bundle 8; the wire guide device 2 is located on one side end face of the unwinding roller 1. The wire guide device 2 is provided with a wire guide hole, and the carbon fiber bundle 8 passes through the wire guide hole. The rolling and gathering device 5 is located on one side end face of the plurality of unwinding rollers 4. The glue extrusion and curing device 6 is located on one side end face of the rolling and gathering device 5, and the glue extrusion and curing device 6 clamps the carbon fiber bundle 8.

[0044] The wire guide hole is a hole with a smooth inner wall, which plays a guiding role in the movement of the carbon fiber bundle 8.

[0045] The plurality of spreading rollers 4 are all located on one side end surface of the wire guide device 2 to spread the carbon fiber bundle 8 until the carbon fiber bundle 8 is spread to a thickness of approximately a single carbon fiber layer.

[0046] Specifically, a plurality of spreading rollers 4 form a V-shape, and under the action of the tension of the carbon fiber bundle 8 and the shear force of the plurality of spreading rollers 4 arranged in a "V" shape, the carbon fiber bundle 8 is evenly spread out along the width direction; wherein, while the carbon fiber bundle 8 passes through the spreading rollers 4, the glue spray head 3 evenly sprays the atomized resin onto the surface of the spread carbon fiber bundle 8.

[0047] The plurality of glue spray heads 3 are all located at the plurality of end surfaces of the spreading roller 4 , and are used to spray the carbon fiber bundles 8 located on the spreading roller 4 .

[0048] Preferably, there are three glue spray heads 3, one pair of which is located at the upper end surface of the wire spreading roller 4, and the other glue spray head 3 is located at the bottom end surface of the wire spreading roller 4. That is, one pair of glue spray heads 3 sprays the front side of the carbon fiber bundle 8, and the other glue spray head 3 sprays the back side of the carbon fiber bundle 8.

[0049] It should be noted that the spraying area of ​​the glue spray head 3 is the area where the carbon fiber bundles 8 contact the spreading roller 4. The main purpose of spraying this area is to reduce the damage to the fiber bundles caused by the shear force generated by the spraying. At the same time, it can also play a lubricating role and reduce the damage to the fiber bundles caused by friction.

[0050] like Figure 5 As shown, the plurality of rolling and gathering devices 5 each include a pair of rolling wheels and a rolling assembly rotation shaft 51, a central die hole is provided on one end face of the rolling and gathering device 5, and a pair of rolling wheels compress the carbon fiber bundle 8. That is, after the carbon fiber bundle 8 enters the wire spreading roller 4, it enters the rolling and gathering device 5 and is re-gathered by the rolling wheel rolling and gathering device.

[0051] It should be noted that when the carbon fiber bundle 8 passes through the central die hole of the rolling gathering device 5, the rolling wheels pressed against each other rotate along the rolling assembly rotation axis 51, which can reduce the friction resistance of the carbon fiber bundle 8 when passing through the central die hole of the rolling gathering device 5, thereby reducing fiber damage.

[0052] like Figure 1-Figure 4 As shown, the glue extrusion curing device 6 includes a pair of glue extrusion curing plates 62, and the pair of glue extrusion curing plates 62 are provided with glue extrusion holes 61. That is, the glue extrusion curing device 6 includes a glue extrusion part and a curing part. The glue extrusion part is mainly the glue extrusion holes 61, and the curing part is the glue extrusion curing plate 62. When the gathered carbon fiber bundle 8 passes through the "trumpet" shaped hole whose opening is narrowed from wide, the carbon fiber bundle 8 further shrinks and gathers, increasing the tendency of the carbon fiber multifilament to

[0053] The glue extrusion hole 61 is trumpet-shaped, and the end surface opening of the glue extrusion hole 61 in contact with the rolling and gathering device 5 is relatively large. Through the trumpet-shaped setting, the hole wall is smooth and wear-resistant, reducing friction resistance and avoiding damage to the carbon fiber bundle 8.

[0054] Specifically, after the carbon fiber bundles 8 move from the rolling gathering device 5 to the glue extrusion and curing device 6, the glue extrusion and curing device 6 further gathers the carbon fiber bundles 8 to increase the tendency of the carbon fiber multifilaments, so that the fibers are further arranged axially to squeeze out excess glue.

[0055] It should be noted that when the carbon fiber bundles 8 enter the glue extrusion and curing device 6 for gathering, the carbon fiber bundles 8 are in a static state. After the gathering of the carbon fiber bundles 8 is completed, the glue extrusion and curing device 6 is opened and a pair of glue extrusion and curing plates 62 are separated, and then the processed carbon fiber bundles 8 can be taken out.

[0056] Specifically, because sliding shear will cause resin tendency and abnormally increase tensile strength, a pressure-maintaining curing method is used to cure the sample. During curing, the carbon fiber bundle 8 is stationary relative to the glue squeezing curing device 6. At this time, the pressure perpendicular to the linear direction is relatively large. If the curing time is long, it is easy to cause the resin glue to be lost, resulting in glue shortage and defects in the sample. Therefore, a microwave curing method is used to improve the curing efficiency and reduce sample defects. The cured sample strip is taken out by opening the glue squeezing curing plate 62. The cross-sectional changes of the carbon fiber bundle are as follows: Figure 3 As shown in the third region carbon fiber bundle 11 and the fourth region carbon fiber bundle 12.

[0057] A clamping and traction device 7 is provided on one end face of the glue extrusion and curing device 6, and the clamping and traction device 7 drives the carbon fiber bundle 8 to move, that is, provides traction force for the carbon fiber bundle 8 to be processed.

[0058] like Figure 1-Figure 9 As shown, a method for preparing a sample device for reducing the rubber content of a carbon fiber multifilament drawing spline comprises the following steps;

[0059] S1, unfolding the gathered carbon fiber bundle 8; leading the carbon fiber bundle 8 from the wire-releasing roller 1, and sequentially entering the wire guide device 2 and the wire-spreading roller 4, and unfolding it, that is, Figure 6 1 and 2 , which is the original state of the rolling and gathering device 5 before processing.

[0060] S2, uniform spraying; while the carbon fiber bundle 8 passes through the wire spreading roller 4, the resin glue is atomized with multiple glue spray heads 3 and evenly sprayed onto the surface of the unfolded carbon fiber bundle 8, that is, Figure 7 As shown, Figure 7 The shape of the carbon fiber bundle 8 after being spread and sprayed by multiple spreading rollers 4. The main purpose is to reduce the damage to the fiber bundle caused by the shear force generated by the spraying, and it can also play a lubricating role and reduce the damage to the fiber bundle caused by friction.

[0061] S3, gathering; the sprayed carbon fiber bundle 8 is introduced into the rolling gathering device 5 for re-gathering; that is, Figure 8 As shown in FIG. 1 , the shape of the carbon fiber bundle 8 after being gathered by the rolling gathering device 5 is shown. Figure 8 As shown, it is a diagram showing the shape of the carbon fiber bundle 8 after the carbon fiber bundle 8 is gathered.

[0062] S4, squeeze out the excess glue; the carbon fiber bundle 8 re-gathered in step S3 is pulled through the hole die of the glue extrusion curing device 6 to further shrink and gather, increase the carbon fiber multifilament tendency, and make the fibers further axially arranged to squeeze out the excess glue. Fig. 9 As shown, it is the shape diagram after entering the glue extrusion and curing device 6 for curing.

[0063] That is, the gathered carbon fiber bundles 8 enter the glue extrusion curing device 6, and when passing through the "trumpet"-shaped hole 61 which becomes narrower from wide, the carbon fiber bundles 8 further shrink and gather, increasing the tendency of the carbon fiber multifilaments, so that the fibers are further arranged axially to squeeze out excess glue.

[0064] S5, pressure-maintaining and curing: taking out the processed carbon fiber bundle 8 from the glue extrusion and curing device 6. Using microwave curing can improve curing efficiency and reduce sample defects.

[0065] S6, making finished products: the cured sample obtained in step S5 is post-processed to eliminate internal stress, that is, post-processed in an oven to improve the degree of curing and eliminate internal stress, and the preparation of the carbon fiber multifilament tensile sample is completed.

[0066] like Figure 3 As shown, the shapes of the carbon fiber bundles 8 entering the wire guiding device 2, the wire spreading roller 4, the rolling and gathering device 5 and the extrusion and curing device 6 in sequence are all different, including the first-region carbon fiber bundles 9, the second-region carbon fiber bundles 10, the third-region carbon fiber bundles 11 and the fourth-region carbon fiber bundles 12, that is, the first-region carbon fiber bundles 9 are the initial state of the carbon fiber bundles 8 when entering the wire guiding device 2, the second-region carbon fiber bundles 10 are the shape when entering the wire spreading roller 4, the third-region carbon fiber bundles 11 are the state when entering the rolling and gathering device 5, and the fourth-region carbon fiber bundles 12 are the shape when entering the extrusion and curing device 6.

[0067] The unfolded area of ​​the carbon fiber bundle 10 in the second region is larger than the unfolded area of ​​the carbon fiber bundle 9 in the first region, the unfolded area of ​​the carbon fiber bundle 11 in the third region is smaller than the unfolded area of ​​the carbon fiber bundle 9 in the first region, and the unfolded area of ​​the carbon fiber bundle 12 in the fourth region is smaller than the unfolded area of ​​the carbon fiber bundle 11 in the third region.

[0068] Compared with the traditional dipping method, the glue spraying and impregnation method of this method can make the carbon fiber multifilament carry less glue; compared with the traditional scraping method, the glue extrusion removal method of this method can remove more glue; the carbon fiber multifilament in the initial state of this method carries less glue, and more glue is removed during the glue squeezing process, so the sample prepared by this method has a lower glue content than the traditional sample preparation method. In the traditional dipping method, the fiber is completely immersed in the resin liquid, and the fiber is easily damaged by the liquid tension. In this method, the tension of the liquid spraying and impregnation is small, which can reduce fiber damage. The traditional curing method is to keep the impregnated multifilament under a certain tension and cure it in an oven. During the curing process, there is only tension along the linear direction of the fiber, and there is no constraint in the direction perpendicular to the linear direction. The fiber is easy to spread around, and the fiber bundles are loosely arranged, which is easy to form defects inside. In this method, pressure-maintaining curing has a constraint in the direction perpendicular to the linear direction during the curing process, which can reduce internal defects of the sample.

[0069] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0070] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A sample preparation device for reducing the rubber content of carbon fiber multifilament drawing spline, characterized in that: Including; A pay-off roller connects the carbon fiber bundles and draws out the carbon fiber bundles; A wire guiding device, located on one end surface of the wire unwinding roller; A plurality of spreading rollers are located on one side of the wire guide device to spread the carbon fiber bundles; A plurality of glue spray heads are located at a plurality of end surfaces of the spreading roller to spray the carbon fiber bundles located on the spreading roller; A rolling gathering device is located on one end surface of the plurality of wire spreading rollers; The glue extrusion and curing device is located on one side end surface of the rolling and gathering device, and the glue extrusion and curing device clamps the carbon fiber bundles.

2. A sample preparation device for reducing the rubber content of carbon fiber multifilament drawing spline according to claim 1, characterized in that: The wire guiding device is provided with a wire guiding hole, and the carbon fiber bundle passes through the wire guiding hole.

3. A sample preparation device for reducing the rubber content of carbon fiber multifilament drawing spline according to claim 1 or 2, characterized in that: There are three of the plurality of glue spray heads, one pair of which is located at the upper end surface of the wire spreading roller, and the other glue spray head is located at the bottom end surface of the wire spreading roller.

4. A sample preparation device for reducing the rubber content of carbon fiber multifilament drawing spline according to claim 3, characterized in that: A plurality of the wire spreading rollers form a V shape.

5. A sample preparation device for reducing the rubber content of carbon fiber multifilament drawing strips according to claim 1 or 4, characterized in that: The plurality of rolling and gathering devices each comprise a pair of rolling wheels and a rolling assembly rotation shaft. A central die hole is provided on one end face of the rolling and gathering device. The pair of rolling wheels compress the carbon fiber bundles.

6. A sample preparation device for reducing the rubber content of carbon fiber multifilament drawing strips according to claim 1, characterized in that: The glue extrusion and curing device comprises a pair of glue extrusion and curing plates, and the pair of glue extrusion and curing plates are provided with glue extrusion holes.

7. A sample preparation device for reducing the rubber content of carbon fiber multifilament drawing strips according to claim 6, characterized in that: The glue extrusion hole is trumpet-shaped, and the end surface of the glue extrusion hole in contact with the rolling and gathering device has a larger opening.

8. A sample preparation device for reducing the rubber content of carbon fiber multifilament drawing strips according to claim 7, characterized in that: A clamping and traction device is arranged on one end face of the glue extrusion and curing device, and the clamping and traction device drives the carbon fiber bundle to move.

9. A method for reducing the rubber content of carbon fiber multifilament drawing spline sample preparation device, characterized in that: The method comprises the following steps: S1, unfolding the gathered carbon fiber bundles; drawing the carbon fiber bundles out from the pay-off roller, and sequentially entering the wire guide device and the wire spreading roller for unfolding; S2, uniform spraying: using multiple spray heads to atomize the resin glue liquid and spray it evenly onto the surface of the unfolded carbon fiber bundle; S3, gather; The sprayed carbon fiber bundles are introduced into a rolling gathering device for re-gathering; S4, squeezing out excess glue; passing the re-gathered carbon fiber bundles in the above step S3 through a glue extrusion and curing device to draw a hole die, further shrinking and gathering, increasing the tendency of the carbon fiber multifilaments, and making the fibers further arranged axially to squeeze out excess glue; S5, pressure-maintaining curing; using microwave curing to improve curing efficiency and reduce sample defects; S6, making finished products; post-processing the cured specimens obtained in the above step S5 to eliminate internal stress.

10. The method for preparing a sample device for reducing the rubber content of carbon fiber multifilament drawing spline according to claim 9, characterized in that: The shapes of the carbon fiber bundles entering the wire guide device, the wire spreading roller, the rolling and gathering device and the glue extrusion and curing device in sequence are all different, including carbon fiber bundles in the first area, carbon fiber bundles in the second area, carbon fiber bundles in the third area and carbon fiber bundles in the fourth area. The unfolding area of ​​the carbon fiber bundles in the second area is larger than the unfolding area of ​​the carbon fiber bundles in the first area, the unfolding area of ​​the carbon fiber bundles in the third area is smaller than the unfolding area of ​​the carbon fiber bundles in the first area, and the unfolding area of ​​the carbon fiber bundles in the fourth area is smaller than the unfolding area of ​​the carbon fiber bundles in the third area.

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