A fixture system for detecting mechanical properties of carbon fiber tows

Abstract

The utility model discloses a kind of clamp systems for detecting carbon fiber tow mechanical properties, including at least one fixture device, fixture device includes: fixed part;First clamp, fixed in fixed part, outer surface includes first clamping surface, first clamping surface includes first clamping area and second clamping area;Second clamp, slidably set in fixed part, outer surface includes second clamping surface, second clamping surface is opposite with first clamping surface, first clamping surface and second clamping surface jointly form the clamping space for clamping carbon fiber tow, second clamping surface includes third clamping area and fourth clamping area, third clamping area is opposite with first clamping area, fourth clamping area is opposite with second clamping area;Wherein, first clamping area and third clamping area are all provided with multiple first sawteeth, second clamping area and fourth clamping area are all provided with multiple second sawteeth, and the surface roughness of second sawteeth is greater than the surface roughness of first sawteeth.

Description

Technical Field

[0001] This utility model relates to the field of carbon fiber technology, and more specifically, to a clamping system for testing the mechanical properties of carbon fiber bundles. Background Technology

[0002] The mechanical properties of carbon fiber tow are its core performance indicators, affecting the load-bearing capacity and application performance of composite materials. Excellent mechanical properties (such as high strength and high modulus) ensure that composite materials play a crucial role in aerospace, automotive manufacturing, wind turbine blades, and other fields. Therefore, the testing of mechanical properties is essential for the research and development and application of carbon fiber materials. During mechanical property testing, fixtures are needed to hold the carbon fiber tow. However, during the clamping process, problems such as slippage and damage to the carbon fiber tow may occur.

[0003] Therefore, finding a clamping system to reduce carbon fiber tow damage is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] To address the aforementioned technical problems, this invention provides a clamping system for testing the mechanical properties of carbon fiber tow.

[0005] This utility model provides a clamping system for testing the mechanical properties of carbon fiber tow. The clamping system includes at least one clamping device, which includes:

[0006] Fixing part;

[0007] A first clamp is fixed to the fixing part. The outer surface of the first clamp includes a first clamping surface, and the first clamping surface includes a first clamping area and a second clamping area.

[0008] The second clamp is slidably disposed on the fixed part. The sliding direction of the second clamp is perpendicular to the first clamping surface. The outer surface of the second clamp includes a second clamping surface, which is opposite to the first clamping surface. The first clamping surface and the second clamping surface together form a clamping space for clamping carbon fiber bundles. The second clamping surface includes a third clamping area and a fourth clamping area, which are opposite to the first clamping area and the fourth clamping area is opposite to the second clamping area.

[0009] The first clamping area and the third clamping area are each provided with a plurality of first serrations, and the second clamping area and the fourth clamping area are each provided with a plurality of second serrations, wherein the surface roughness of the second serrations is greater than the surface roughness of the first serrations.

[0010] In some embodiments of this utility model, the height of the first saw tooth is lower than the height of the second saw tooth;

[0011] The tooth pitch between adjacent first saw teeth is smaller than the tooth pitch between adjacent second saw teeth;

[0012] The first saw tooth has a tooth height of 0.1 mm to 0.3 mm, a tooth pitch of 0.2 mm to 0.5 mm between adjacent first saw teeth, and a surface roughness of 0.8 μm to 1.2 μm; the second saw tooth has a tooth height of 0.3 mm to 0.5 mm, a tooth pitch of 0.5 mm to 1 mm between adjacent second saw teeth, and a surface roughness of 1.2 μm to 1.6 μm.

[0013] In some embodiments of this utility model, the outer surface of the first clamp further includes a side surface opposite to the first clamping surface, and a first surface and a second surface disposed opposite to each other. The two sides of the first surface and the second surface are respectively connected to the first clamping surface and the side surface. A limiting groove is provided on the first surface and / or the second surface, and both ends of the limiting groove penetrate the first clamping surface and the side surface. The limiting groove is used to accommodate the carbon fiber bundle. The groove wall of the limiting groove includes a first groove wall and a second groove wall disposed opposite to each other, with the first groove wall and the second groove wall forming an included angle. The clamping device further includes:

[0014] A first adjusting device is disposed on the first clamp, and the first adjusting device is used to adjust the distance between the first groove wall and the second groove wall.

[0015] In some embodiments of this utility model, the clamping device further includes:

[0016] An elastic layer is disposed on the groove wall surface of the limiting groove.

[0017] In some embodiments of this utility model, the first clamping surface and the groove wall surface of the limiting groove are connected by a transition arc surface.

[0018] In some embodiments of this utility model, the clamping device further includes:

[0019] A second adjusting device is connected to the second clamp and is used to drive the second clamp to slide so as to adjust the distance between the first clamping surface and the second clamping surface.

[0020] In some embodiments of this utility model, the second adjusting device includes:

[0021] A pressure sensor is used to detect the pressure value between the first clamping surface and the second clamping surface;

[0022] A regulating valve is connected to the second clamp, and the regulating valve is used to drive the second clamp to slide according to the pressure value, so as to adjust the distance between the first clamping surface and the second clamping surface.

[0023] In some embodiments of this utility model, the clamping system further includes:

[0024] A twisting device is used to twist the carbon fiber bundle held by the clamping device.

[0025] In some embodiments of this utility model, the twisting device includes:

[0026] First robotic arm;

[0027] Second robotic arm;

[0028] A drive motor is electrically connected to both the first and second robotic arms. The drive motor is used to drive the first and second robotic arms to move in coordination to twist the carbon fiber bundle.

[0029] In some embodiments of this utility model, at least one of the clamping devices includes a first clamping device and a second clamping device, wherein the clamping space of the first clamping device is opposite to the clamping space of the second clamping device, so that the first clamping device and the second clamping device can jointly clamp the same bundle of fiber filaments.

[0030] The technical solutions provided by the embodiments of this utility model can achieve the following beneficial effects:

[0031] This utility model provides a clamping system for testing the mechanical properties of carbon fiber bundles. By setting a first sawtooth and a second sawtooth with different roughness, when the first sawtooth and the second sawtooth clamp the carbon fiber bundle at the same time, the first sawtooth can avoid damage to the carbon fiber bundle, and the second sawtooth can avoid slippage of the carbon fiber bundle. This avoids the problems of carbon fiber slippage or damage caused by using a sawtooth with a single roughness, thereby improving the reliability of the clamping system for holding carbon fiber bundles. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a clamping system for detecting the mechanical properties of carbon fiber tow according to an exemplary embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of a clamping system for detecting the mechanical properties of carbon fiber tow according to another exemplary embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of a clamping system for detecting the mechanical properties of carbon fiber tow according to another exemplary embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the limiting groove provided according to an exemplary embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the structure of an elastic layer according to an exemplary embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of a clamping system for detecting the mechanical properties of carbon fiber tow, according to another exemplary embodiment of the present invention.

[0039] The following labels are used in the attached diagram:

[0040] 10. Clamping device; 11. Fixing part; 12. First clamp; 13. Second clamp; 14. First adjusting device; 15. Elastic layer; 20. Twisting device; 101. First clamping device; 102. Second clamping device; 121. First clamping area; 122. Second clamping area; 123. First surface; 124. Second surface; 131. Third clamping area; 132. Fourth clamping area; N. Limiting groove; R. Transition arc surface. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] The mechanical properties of carbon fiber tow are its core performance indicators, affecting the load-bearing capacity and application performance of composite materials. Excellent mechanical properties (such as high strength and high modulus) ensure that composite materials play a crucial role in aerospace, automotive manufacturing, wind turbine blades, and other fields. Therefore, the testing of mechanical properties is essential for the research and development and application of carbon fiber materials. During mechanical property testing, clamps are used to hold the carbon fiber tow. However, unreasonable serration roughness of the clamps often leads to poor clamping performance, thus affecting subsequent mechanical property testing. When the serration roughness is large, the carbon fiber tow is less prone to slippage, but the tow is susceptible to damage. When the serration roughness is small, the carbon fiber tow is less prone to damage, but slippage is more likely.

[0044] To address the aforementioned technical problems, this utility model provides a clamping system for testing the mechanical properties of carbon fiber bundles. By setting a first sawtooth and a second sawtooth with different roughness, when the first sawtooth and the second sawtooth simultaneously clamp the carbon fiber bundle, the first sawtooth can provide a uniform clamping force to prevent damage to the carbon fiber bundle, while the second sawtooth can prevent the carbon fiber bundle from slipping. This avoids problems such as carbon fiber slippage or damage caused by using a sawtooth with a single roughness, thereby improving the reliability of the clamping system in clamping the carbon fiber bundle.

[0045] The following description, in conjunction with the accompanying drawings, details a clamping system for testing the mechanical properties of carbon fiber tow according to the present invention.

[0046] like Figure 1 and Figure 2As shown, an exemplary embodiment of this utility model provides a clamping system for testing the mechanical properties of carbon fiber tow. The clamping system includes at least one clamping device 10, which includes a fixing part 11, a first clamp 12, and a second clamp 13. The first clamp 12 is fixed to the fixing part 11, and its outer surface includes a first clamping surface, which includes a first clamping area 121 and a second clamping area 122. The second clamp 13 is slidably disposed on the fixing part 11, and its sliding direction is perpendicular to the first clamping surface. The outer surface of the second clamp 13 includes a second clamping surface, which is opposite to the first clamping surface. The first and second clamping surfaces together form a clamping space for clamping the carbon fiber tow. The second clamping surface includes a third clamping area 131 and a fourth clamping area 132, where the third clamping area 131 is opposite to the first clamping area 121, and the fourth clamping area 132 is opposite to the second clamping area 122. The first clamping area 121 and the third clamping area 131 are each provided with a plurality of first serrations, and the second clamping area 122 and the fourth clamping area 132 are each provided with a plurality of second serrations, wherein the surface roughness of the second serrations is greater than that of the first serrations.

[0047] In this embodiment, when the carbon fiber tow is located between the first clamp and the second clamp, being held by the first serrations of the first and second clamps can prevent damage to the carbon fiber tow, and being held by the second serrations of the first and second clamps can prevent slippage of the carbon fiber tow due to insufficient friction. By using first and second serrations of different roughness in both the first and second clamps, problems such as carbon fiber slippage or damage caused by using serrations of a single roughness are avoided, thereby improving the reliability of the clamping system.

[0048] For example, the first clamp 12 can be fixed to the fixing part 11 by a screw device. The first clamping area 121 and the second clamping area 122 are arranged adjacent to each other, and the third clamping area 131 and the fourth clamping area 132 are arranged adjacent to each other. The size of the first serrations of the first clamping area 121 and the third clamping area 131 can be the same or different, and the size of the second serrations of the second clamping area 122 and the fourth clamping area 132 can be the same or different.

[0049] For example, the first clamping surface may further include a fifth clamping region and a sixth clamping region arranged adjacent to each other, and the second clamping surface may further include a seventh clamping region and an eighth clamping region arranged adjacent to each other, with the fifth clamping region opposite to the seventh clamping region and the sixth clamping region opposite to the eighth clamping region. Each of the fifth and seventh clamping regions is provided with a plurality of first serrations S1, and each of the sixth and eighth clamping regions is provided with a plurality of second serrations S2. The fifth clamping region is adjacent to the second clamping region 122, and the seventh clamping region is adjacent to the fourth clamping region 132.

[0050] For example, the first clamp 12 and the second clamp 13 may be made of precipitation hardened stainless steel with a nitrided surface to improve wear resistance and life.

[0051] In one embodiment, such as Figure 1 and Figure 2 As shown, the height of the first saw tooth is lower than the height of the second saw tooth. The tooth pitch between adjacent first saw teeth is smaller than the tooth pitch between adjacent second saw teeth. Specifically, the tooth height of the first saw tooth is 0.1 mm to 0.3 mm, the tooth pitch between adjacent first saw teeth is 0.2 mm to 0.5 mm, and the surface roughness of the first saw tooth is 0.8 μm to 1.2 μm. The tooth height of the second saw tooth is 0.3 mm to 0.5 mm, the tooth pitch between adjacent second saw teeth is 0.5 mm to 1 mm, and the surface roughness of the second saw tooth is 1.2 μm to 1.6 μm.

[0052] In this embodiment, since the roughness of the saw teeth is related to the height of the saw teeth and the tooth pitch between adjacent saw teeth, by setting the height of the first saw teeth to be greater than the height of the second saw teeth, and the tooth pitch between adjacent first saw teeth to be less than the tooth pitch between adjacent second saw teeth, the surface roughness of the first saw teeth can be lower than the surface roughness of the second saw teeth, thereby improving the reliability of the fixture system.

[0053] In one embodiment, such as Figure 3 and Figure 4 As shown, the outer surface of the first clamp 12 also includes a side surface opposite to the first clamping surface, and a first surface 123 and a second surface 124 disposed opposite to each other. The two sides of the first surface 123 and the second surface 124 are respectively connected to the first clamping surface and the side surface. The first surface 123 and / or the second surface 124 are provided with a limiting groove N, and the two ends of the limiting groove N penetrate the first clamping surface and the side surface. The limiting groove N is used to accommodate the carbon fiber bundle. The groove wall surface of the limiting groove N includes a first groove wall surface and a second groove wall surface disposed opposite to each other. The first groove wall surface and the second groove wall surface are disposed at an angle. The clamp device 10 also includes a first adjustment device 14. The first adjustment device 14 is disposed on the first clamp 12. The first adjustment device 14 is used to adjust the distance between the first groove wall surface and the second groove wall surface.

[0054] In this embodiment, by providing a limiting groove, the carbon fiber bundle can be guided to be clamped by the first clamp and the second clamp, thereby improving the reliability of the clamping system in clamping the carbon fiber bundle. Furthermore, by providing a first adjustment device, the distance between the first groove wall and the second groove wall can be adjusted, enabling the system to guide carbon fiber bundles of different widths and preventing them from detaching from the limiting groove, thus expanding the applicability of the clamping system.

[0055] For example, the limiting groove N may include a V-shaped groove, a U-shaped groove, etc., and the first groove wall and the second groove wall may be at an angle of 30 degrees, 45 degrees, 90 degrees, etc.

[0056] For example, a limiting device may also be provided on the first clamp 12, the limiting device including a limiting groove N and a first adjusting device 14. The limiting device can be used to form the first clamp 12.

[0057] For example, the width of the adjustable limiting groove N of the first adjusting device 14 can be 2mm-5mm, and the depth of the limiting groove N can include 2mm, 3mm, and 4mm, etc. The first adjusting device can include a threaded adjusting device. For example, the outer surface of the first clamp 12 also includes a third surface and a fourth surface facing away from each other, and the two sides of the third surface and the fourth surface are respectively connected to the first clamping surface and the side surface. The first groove wall and the second groove wall are connected by an elastic support member. The first adjusting device 14 includes a bolt and a nut, the bolt passes through the third surface and exits through the fourth surface, and the nut is screwed onto the part of the bolt that protrudes from the fourth surface. By tightening or loosening the nut, the distance between the first groove wall and the second groove wall can be adjusted under the action of the deformable elastic support member. Of course, the first adjusting device 14 can also be in other configurations, which are not specifically limited here, as long as it can adjust the distance between the first groove wall and the second groove wall.

[0058] In one embodiment, such as Figure 5 As shown, the clamping device 10 also includes an elastic layer 15, which is disposed on the groove wall surface of the limiting groove N.

[0059] In this embodiment, since the surface of the limiting groove is relatively rough, it may damage the carbon fiber bundle. By setting an elastic layer, the elastic layer can deform and fit tightly against the carbon fiber bundle, avoiding damage and slippage of the carbon fiber bundle, thereby improving the reliability of subsequent clamping of the carbon fiber bundle.

[0060] For example, the elastic layer 15 may include an elastic pad with a built-in polyurethane having a Shore hardness of 60A-80A. The thickness of the elastic layer is 0.5mm to 1mm, the compression of the elastic layer 15 is 0.3mm to 0.8mm, and the elastic modulus of the elastic layer 15 is 10MPa to 20MPa.

[0061] In one embodiment, such as Figure 3 As shown, the first clamping surface and the groove wall of the limiting groove N are connected by a transition arc surface R.

[0062] In this embodiment, by setting a transition arc surface, stress concentration can be eliminated, making the carbon fiber bundles at the transition arc surface less prone to breakage, thereby improving the reliability of the fixture system.

[0063] For example, the radius of the transition arc surface R is 1 mm to 2 mm.

[0064] In one embodiment, the clamping device 10 further includes a second adjusting device connected to the second clamp 13. The second adjusting device is used to drive the second clamp to slide so as to adjust the distance between the first clamping surface and the second clamping surface.

[0065] In this embodiment, by driving the second clamp to slide closer to the first clamp using the second adjustment device, the clamping force of the first and second clamps on the carbon fiber bundle can be adjusted, so that the carbon fiber bundle can determine its mechanical properties under the action of a suitable clamping force. By driving the second clamp to slide further away from the first clamp using the second adjustment device, the preload tension between the first and second clamps can be adjusted, thereby improving the reliability of the clamping system.

[0066] For example, the preload tension is 20N to 50N.

[0067] In one embodiment, the second adjusting device includes a pressure sensor and an adjusting valve. The pressure sensor is used to detect the pressure value between the first clamping surface and the second clamping surface. The adjusting valve is connected to the second clamp 13 and is used to drive the second clamp 13 to slide according to the pressure value, so as to adjust the distance between the first clamping surface and the second clamping surface.

[0068] In this embodiment, by adjusting the regulating valve and observing the value of the pressure sensor, the clamping force of the first clamp and the second clamp on the carbon fiber bundle can be determined, thereby improving the reliability of clamping the carbon fiber bundle.

[0069] For example, the pressure sensor has a range of 0N to 50N and an accuracy of 0.5N. The clamping system may also include a control device connected to both the pressure sensor and the regulating valve to automatically control the clamping force between the first clamp 12 and the second clamp 13.

[0070] In one embodiment, such as Figure 6 As shown, the clamping system also includes a twisting device 20, which is used to twist the carbon fiber bundle held by the clamping device 10.

[0071] In this embodiment, since carbon fiber bundles need to be twisted when using a fixture to test their mechanical properties, a twisting device is set up to eliminate the need for manual twisting, thereby improving the testing efficiency.

[0072] For example, the number of twists can be 6, 7, 8, etc.

[0073] In one embodiment, the twisting device 20 includes a first robotic arm, a second robotic arm, and a drive motor. The drive motor is electrically connected to both the first and second robotic arms and is used to drive the first and second robotic arms to move in coordination to twist the carbon fiber tow.

[0074] In this embodiment, after the carbon fiber bundle is clamped by the first and second robotic arms, the first and second robotic arms are driven to rotate by the drive motor, which can twist the carbon fiber bundle, thereby improving the reliability of the twisting device.

[0075] In one embodiment, such as Figure 6 As shown, at least one clamping device 10 includes a first clamping device 101 and a second clamping device 102, with the clamping space of the first clamping device 101 opposite to the clamping space of the second clamping device 102, so that the first clamping device 101 and the second clamping device 102 can jointly clamp the same bundle of fiber filaments.

[0076] In this embodiment, by setting up a first clamping device and a second clamping device, the mechanical property testing device can detect the mechanical properties of the carbon fiber bundle between the first clamping device and the second clamping device, thereby improving the reliability of the clamping system from scratch.

[0077] For example, the first clamping device 101 and the second clamping device 102 can be arranged along a preset direction, which can be a vertical direction. Along the preset direction, the first clamp 12 of the first clamping device 101 is arranged opposite to the second clamp 13 of the second clamping device 102, and the second clamp 13 of the first clamping device 101 is arranged opposite to the first clamp 12 of the second clamping device 102. Alternatively, the first clamp 12 of the first clamping device 101 is arranged opposite to the first clamp 12 of the second clamping device 102, and the second clamp 13 of the first clamping device 101 is arranged opposite to the second clamp 13 of the second clamping device 102.

[0078] For example, the first surface 123 of the first clamp 12 of the first clamping device 101 is provided with a limiting groove N, the second surface 124 of the second clamping device 102 is provided with a limiting groove N, and the twisting device 20 is disposed at the limiting groove N of the second clamping device 102.

[0079] For example, after placing the carbon fiber tow into the limiting groove N of the first clamping device 101, the second adjusting device of the first clamping device 101 controls the first clamp 12 and the second clamp 13 of the first clamping device 101 to close, and the second adjusting device of the second clamping device 102 controls the first clamp 12 and the second clamp 13 of the second clamping device 102 to close. Then, the twisting device 20 is controlled to twist the carbon fiber tow. Then, the preload tension of the first clamping device 101 and the second clamping device 102 is adjusted (this can be achieved by the second adjusting device or by controlling the reverse stretching between the first clamp 12 and the second clamp 13), and the first clamping device 101 and the second clamping device 102 are closed again. Then, the mechanical properties of the carbon fiber tow between the first clamping device 101 and the second clamping device 102 are tested.

[0080] For example, mechanical properties can be tested using a pneumatic-electronic universal testing machine.

[0081] Example 1:

[0082] Taking the testing of the mechanical properties of T800 grade carbon fiber tow as an example, one end of the carbon fiber tow is placed in the limiting groove N of the first clamping device 101. The carbon fiber tow can automatically compress the elastic layer 15 to fit tightly. The carbon fiber tow passes through the clamping space of the first clamping device 101 and the clamping space of the second clamping device 102. The first clamping device and the second clamping device are closed. The other end of the carbon fiber tow is placed in the twisting device 20. The twisting device 20 twists the carbon fiber tow 6 to 7 times. Then the twisting device moves towards the limiting groove of the second clamping device 102, locking the other end of the carbon fiber tow into the limiting groove N. Then, a preload tension (20N to 25N) is applied to the first clamping device 101 and the second clamping device 102 through two second adjustment devices. Then, the electronic universal testing machine is started to stretch the carbon fiber tow between the first clamping device 101 and the second clamping device 102 at 20mm / min to obtain the mechanical properties. Table 1 provides the mechanical property indicators of this application compared with conventional clamps.

[0083] Performance indicators Traditional clamps The clamping system of this utility model Fracture anomaly rate / % 38.6 14.8 CV value of tensile strength / % 6.0 3.1 Damage to carbon fiber bundles at the clamp 23% showed obvious slippage and damage. 6% showed slight slippage

[0084] It is understood that the clamps in Table 1 refer to the arc transition structure, while the transmission clamp has a right-angle transition structure in this area. Using the clamping system provided by this utility model, the coefficient of variation (CV) of the mechanical properties (tensile strength) of the carbon fiber tow decreased from 8.2% to 3.5%. The damage level on the surface of the carbon fiber tow also decreased from 22% to 5%, and the effective breakage rate of the carbon fiber tow increased from 77% to 85%.

[0085] The embodiments described in this specification are merely examples of implementations of the inventive concept. The scope of protection of this utility model should not be considered as limited to the specific forms described in the embodiments. The scope of protection of this utility model also includes equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A clamping system for testing the mechanical properties of carbon fiber tow, characterized in that, The clamping system includes at least one clamping device, the clamping device comprising: Fixing part; A first clamp is fixed to the fixing part. The outer surface of the first clamp includes a first clamping surface, and the first clamping surface includes a first clamping area and a second clamping area. The second clamp is slidably disposed on the fixed part. The sliding direction of the second clamp is perpendicular to the first clamping surface. The outer surface of the second clamp includes a second clamping surface, which is opposite to the first clamping surface. The first clamping surface and the second clamping surface together form a clamping space for clamping carbon fiber bundles. The second clamping surface includes a third clamping area and a fourth clamping area, which are opposite to the first clamping area and the fourth clamping area is opposite to the second clamping area. The first clamping area and the third clamping area are each provided with a plurality of first serrations, and the second clamping area and the fourth clamping area are each provided with a plurality of second serrations, wherein the surface roughness of the second serrations is greater than the surface roughness of the first serrations.

2. The clamping system for testing the mechanical properties of carbon fiber tow according to claim 1, characterized in that, The height of the first saw tooth is lower than the height of the second saw tooth; The tooth pitch between adjacent first saw teeth is smaller than the tooth pitch between adjacent second saw teeth; The first saw tooth has a tooth height of 0.1 mm to 0.3 mm, a tooth pitch of 0.2 mm to 0.5 mm between adjacent first saw teeth, and a surface roughness of 0.8 μm to 1.2 μm; the second saw tooth has a tooth height of 0.3 mm to 0.5 mm, a tooth pitch of 0.5 mm to 1 mm between adjacent second saw teeth, and a surface roughness of 1.2 μm to 1.6 μm.

3. The clamping system for testing the mechanical properties of carbon fiber tow according to claim 1, characterized in that, The outer surface of the first clamp further includes a side surface opposite to the first clamping surface, and a first surface and a second surface disposed opposite to each other. The two sides of the first surface and the second surface are respectively connected to the first clamping surface and the side surface. A limiting groove is provided on the first surface and / or the second surface, and both ends of the limiting groove penetrate the first clamping surface and the side surface. The limiting groove is used to accommodate the carbon fiber bundle. The groove wall surface of the limiting groove includes a first groove wall surface and a second groove wall surface disposed opposite to each other, forming an included angle. The clamping device further includes: A first adjusting device is disposed on the first clamp, and the first adjusting device is used to adjust the distance between the first groove wall and the second groove wall.

4. The clamping system for testing the mechanical properties of carbon fiber tow according to claim 3, characterized in that, The clamping device further includes: An elastic layer is disposed on the groove wall surface of the limiting groove.

5. The clamping system for testing the mechanical properties of carbon fiber tow according to claim 3, characterized in that, The first clamping surface and the groove wall of the limiting groove are connected by a transition arc surface.

6. The clamping system for testing the mechanical properties of carbon fiber tow according to claim 1, characterized in that, The clamping device further includes: A second adjusting device is connected to the second clamp and is used to drive the second clamp to slide so as to adjust the distance between the first clamping surface and the second clamping surface.

7. The clamping system for testing the mechanical properties of carbon fiber tow according to claim 6, characterized in that, The second adjusting device includes: A pressure sensor is used to detect the pressure value between the first clamping surface and the second clamping surface; A regulating valve is connected to the second clamp, and the regulating valve is used to drive the second clamp to slide according to the pressure value, so as to adjust the distance between the first clamping surface and the second clamping surface.

8. The clamping system for testing the mechanical properties of carbon fiber tow according to any one of claims 1 to 7, characterized in that, The clamping system also includes: A twisting device is used to twist the carbon fiber bundle held by the clamping device.

9. The clamping system for testing the mechanical properties of carbon fiber tow according to claim 8, characterized in that, The twisting device includes: First robotic arm; Second robotic arm; A drive motor is electrically connected to both the first and second robotic arms. The drive motor is used to drive the first and second robotic arms to move in coordination to twist the carbon fiber bundle.

10. The clamping system for testing the mechanical properties of carbon fiber tow according to any one of claims 1 to 7, characterized in that, At least one of the clamping devices includes a first clamping device and a second clamping device, wherein the clamping space of the first clamping device is opposite to the clamping space of the second clamping device, so that the first clamping device and the second clamping device can jointly clamp the same bundle of fiber filaments.

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