A Tensioning Device for Testing the Performance of Carbon Fiber Multifilament Tensile Specimens

Abstract

The present invention relates to a tensioning device for testing the performance of a carbon fiber multifilament tensile spline, which includes a horizontally arranged bottom plate; a stretching module is arranged on the bottom plate, and the stretching module includes a first pressing component and a second pressing component for fixing the carbon fiber tow. At least one group of the first pressing component and the second pressing component is provided with a sliding component below, so that the pressing component provided with the sliding component can move in the extending direction of the carbon fiber tow. The end of the stretching module where the movable pressing component is located is the stretching end; a transmission structure and a driving device are arranged on the bottom plate, and the transmission structure is in transmission connection with the stretching end of the stretching module; the output end of the driving device is in transmission connection with one end of the transmission structure; it can conveniently realize the tensioning of the carbon fiber tow, facilitate the impregnation treatment of the tensioned carbon fiber tow, thereby ensuring the standardization of the produced test sample and the accuracy of the test results of the test sample.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite material performance testing, and particularly relates to a tensioning device for preparing a test sample of a carbon fiber multifilament tensile spline performance test. Background Art

[0002] Carbon fiber mainly refers to a new type of material composed of carbon-carbon chemical bonds, which has excellent properties such as heat resistance, thermal shock resistance, corrosion resistance, heat conduction, and electrical conductivity. Carbon fiber composites were first applied in the fields of rockets, aerospace, but with the rapid development of the technology for preparing composite materials, in recent years, carbon fiber composites have been widely applied to the fields of automobiles, wind power, sports equipment, medical devices, etc.

[0003] The parameters for evaluating the mechanical properties of carbon fiber composites mainly include tensile strength, tensile modulus, elongation at break, damage rate, etc. The numerical quality of these parameters is directly related to the product quality of carbon fiber composites. However, in the actual deep processing of carbon fiber composites, such as carbon fiber winding and unwinding, carbon fiber weaving, and different carbon fiber yarn spreading methods, etc., will cause a high filament breakage rate, and these process methods will affect the mechanical properties of carbon fiber composites. Especially as carbon fiber composites are increasingly applied to high-end fields, it becomes more and more important to calibrate the mechanical properties of carbon fibers produced by different process methods.

[0004] At present, the national standard GB / T3362-2017 "Test Method for Tensile Properties of Carbon Fiber Multifilaments" stipulates the method for preparing specimens by the manual dipping method of carbon fiber multifilaments. Among them, it is required that the carbon fiber tow be tightened and straightened on the stretching frame and then the tightened and straightened carbon fiber tow be impregnated. However, in the actual sample preparation process, there are few professional sample preparation devices that can tighten and straighten the carbon fiber tow, resulting in non-standard test samples, affecting the accuracy of the test results of the test samples, and also unable to accurately reflect the true mechanical properties of the test samples. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a tensioning device for preparing a test sample of a carbon fiber multifilament tensile spline performance test to solve the technical problem that it is difficult to tighten and straighten the carbon fiber tow in the method of preparing specimens by the manual dipping method of carbon fiber multifilaments in the prior art.

[0006] To achieve the above purpose, the technical solution adopted by a tensioning device for preparing a test sample of a carbon fiber multifilament tensile spline performance test of the present invention is as follows:

[0007] A tensioning device for preparing a test sample of a carbon fiber multifilament tensile spline performance test includes:

[0008] A bottom plate: horizontally arranged;

[0009] Stretching module: It is arranged on the bottom plate. The stretching module includes a first pressing component and a second pressing component for fixing the carbon fiber tow. At least one of the first pressing component and the second pressing component can move in the extending direction of the carbon fiber tow. The end of the movable pressing component of the stretching module towards which is the stretching end;

[0010] Transmission structure: It is arranged on the bottom plate. One end of the transmission structure is in transmission connection with the stretching end of the stretching module;

[0011] Driving device: It is arranged on the bottom plate. The output end of the driving device is in transmission connection with one end of the transmission structure.

[0012] Beneficial effects: In the stretching module of the present invention, a first pressing component and a second pressing component are provided. The first pressing component and the second pressing component cooperate to clamp both ends of the carbon fiber tow. At least one of the first pressing component and the second pressing component can move in the extending direction of the carbon fiber tow, and the end of the movable pressing component of the stretching module towards which is the stretching end. Under the driving action of the driving device, it drives the transmission structure to realize the tensioning of the carbon fiber tow fixed between the first pressing component and the second pressing component in the stretching module, which can conveniently realize the tensioning of the carbon fiber tow, facilitate the impregnation treatment of the tensioned carbon fiber tow, thereby ensuring the standardization of the produced test sample and the accuracy of the test results of the test sample.

[0013] Further, both the first pressing component and the second pressing component can move in the extending direction of the carbon fiber tow. Both ends of the stretching module are stretching ends. The left end of the stretching module is the first stretching end, and the right end of the stretching module is the second stretching end; A tension display structure is arranged between the first stretching end and the first pressing component, and a fine adjustment structure is arranged at the second stretching end.

[0014] Beneficial effects: The tensioning of the carbon fiber tow in the stretching module can be adjusted respectively from the first stretching end and the second stretching end of the stretching module, and the combination of coarse adjustment and fine adjustment is more convenient to control the tension of the carbon fiber tow.

[0015] Further, the first pressing component and the second pressing component have the same structure, and both include a slide rail extending in the left-right direction relatively fixed on the bottom plate, a slider slidably adapted to the slide rail, a lower pressing plate fixedly arranged on the slider, and an upper pressing plate capable of moving up and down relative to the lower pressing plate; The upper pressing plate and the lower pressing plate are arranged corresponding to each other up and down.

[0016] Beneficial effects: The structures of the first pressing component and the second pressing component are simply and reasonably arranged. They can not only fix the carbon fiber tow, but also realize the sliding connection of the upper pressing plate and the lower pressing plate relative to the bottom plate, providing conditions for the tensioning of the carbon fiber tow clamped by the upper pressing plate and the lower pressing plate.

[0017] Furthermore, a mounting plate is fixedly provided on the lower pressing plate, a telescopic cylinder which can be telescopic in the up and down directions is fixed on the mounting plate, and the upper pressing plate is fixed to the lower end of the piston rod of the telescopic cylinder.

[0018] Beneficial effect: The arrangement of the mounting plate and the telescopic cylinder can realize the up and down movement of the upper pressing plate relative to the lower pressing plate.

[0019] The first stretching end includes a guide rail extending in the left-right direction, the guide rail and the slide rail of the clamping assembly are located on the same straight line, the guide rail sliding adapter is equipped with a guide block, a first fixed seat is fixed on the guide block, the first fixed seat is transmission-connected to the transmission structure, and the first fixed seat is transmission-connected to the first clamping assembly.

[0020] Beneficial effects: The first stretching end structure is simple to set up, and the setting of the first stretching end can realize the transmission connection between the transmission structure and the first clamping assembly.

[0021] Furthermore, the first clamping assembly includes a second fixed seat, which is fixed on the lower pressure plate; the tension display structure includes a tension sensor fixed on the first fixed seat, a first transmission pull ring fixed on the right side of the tension sensor, a second transmission pull ring fixed on the second fixed seat, and a tension spring arranged between the first transmission pull ring and the second transmission pull ring.

[0022] Beneficial effect: The setting of the tension display structure can facilitate the observation of the tension force on the carbon fiber tow.

[0023] The second clamping assembly includes a third fixing seat, which is fixed on the lower pressure plate; a fourth fixing seat is fixed at intervals on the right side of the second clamping assembly; the third fixing seat is provided with a circular groove with an opening facing the third side, a stop edge is provided at the opening of the circular groove, a threaded hole is provided on the fourth fixing seat, and the fine-tuning structure includes a fine-pitch bolt, one end of the fine-pitch bolt is adapted to the circular groove and is rotatably arranged in the circular groove, the fine-pitch bolt passes through the threaded hole on the fourth fixing seat and is threadably adapted to the threaded hole, and a handwheel is fixed to the end of the fine-pitch bolt away from the fourth fixing seat.

[0024] Beneficial effect: Turning the hand wheel can achieve adjustment of the second clamping assembly relative to the base plate through a fine-thread bolt, thereby achieving a coarse adjustment of the tensioning force of the carbon fiber tow by driving the transmission structure to adjust the first clamping assembly, and achieving fine adjustment of the carbon fiber tow through the fine-tuning structure, thereby facilitating control of the tensioning force of the carbon fiber tow.

[0025] The stretching modules are arranged in four groups at intervals along the front-to-back direction. The stretching ends of the stretching modules are provided with tensioning plates extending along the front-to-back direction. The tensioning plates are fixedly connected to the stretching ends of the stretching modules. The transmission structure is transmission-connected to the first stretching ends of the stretching modules through the tensioning plates.

[0026] Beneficial effects: The setting of the four groups of stretching modules can increase the efficiency of tensioning the carbon fiber tow.

[0027] The transmission structure is a lead screw and nut structure. The lead screw includes smooth shaft sections at both ends and a threaded section in the middle. The lead screw is supported on the bottom plate by two bearings arranged at intervals left and right. The bearings are rotationally matched with the smooth shaft sections of the lead screw. A nut is threadedly engaged with the threaded section, and the tensioning plate is fixedly connected to the nut.

[0028] Beneficial effects: The transmission structure is simply and reasonably arranged. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of a tensioning device for testing the performance of a carbon fiber multifilament stretching spline according to the present invention;

[0030] Figure 2 is Figure 1 a schematic structural diagram of another perspective of a tensioning device for testing the performance of a carbon fiber multifilament stretching spline in

[0031] Reference numerals: 1 - bottom plate; 2 - servo motor; 3 - servo motor mounting plate; 4 - bearing; 5 - bearing bracket; 6 - tensioning plate; 7 - guide block; 8 - first fixing seat; 9 - tension spring; 10 - fixing block; 11 - second transmission pull ring; 12 - second fixing seat; 13 - slider; 14 - lower pressing plate; 15 - upper pressing plate; 16 - telescopic cylinder; 17 - carbon fiber tow; 18 - mounting plate; 19 - cushion block; 20 - tension sensor; 21 - first transmission pull ring; 26 - third fixing seat; 27 - fine-thread bolt; 28 - fourth fixing seat; 29 - handwheel; 35 - nut; 36 - coupling. Detailed Description of the Invention

[0032] The following further describes in detail a tensioning device for testing the performance of a carbon fiber multifilament stretching spline according to the present invention in conjunction with the drawings and the specific embodiments:

[0033] As Figure 1 and Figure 2As shown in the figure, a tensioning device for testing the performance of a carbon fiber multifilament tensile spline according to the present invention includes a horizontally arranged bottom plate 1. A stretching module is arranged on the bottom plate 1. The stretching module includes a first pressing component and a second pressing component for fixing the carbon fiber filament bundle 17. The first pressing component and the second pressing component are arranged at a left-right interval. At least one group of the first pressing component and the second pressing component is provided with a sliding component below it so that the pressing component provided with the sliding component can move in the extending direction of the carbon fiber filament bundle 17. The end of the stretching module where the movable pressing component faces is the stretching end. In this embodiment, a first sliding component is arranged below the first pressing component, and a second sliding component is arranged below the second pressing component. Both the first pressing component and the second pressing component can move in the extending direction of the carbon fiber filament bundle 17. That is, both ends of the stretching module are stretching ends. The left end of the stretching module is the first stretching end, and the right end of the stretching module is the second stretching end.

[0034] The first sliding component and the second sliding component have the same structure, and both include a slide rail extending in the left-right direction relatively fixed to the bottom plate 1 and a slider 13 slidably adapted to the slide rail; the first pressing component and the second pressing component have the same structure, and both include a lower pressing plate 14 fixed on the slider 13 and an upper pressing plate 15 capable of moving up and down relative to the lower pressing plate 14. The upper pressing plate 15 and the lower pressing plate 14 are arranged corresponding to each other up and down. Specifically, the slide rails of the first sliding component and the second sliding component are located on the same straight line; the sliding component further includes a fixing block 10 fixed on the upper surface of the bottom plate 1 and extending in the left-right direction, and the lower surface of the slide rail is fixed on the fixing block 10. Tracks are arranged on the front and rear sides of the slide rail, and the slider 13 is slidably and guidingly adapted to the slide rail. The lower pressing plate 14 is a horizontal plate, and the upper pressing plate 15 is a horizontal long strip plate, and the length of the upper pressing plate 15 in the left-right direction is greater than the length in the front-rear direction, so that the lower pressing plate 14 and the upper pressing plate 15 can be mutually extruded, thereby providing a greater clamping force to the carbon fiber filament bundle 17 in the extending direction of the carbon fiber filament bundle 17.

[0035] Specifically, a vertically arranged mounting plate 18 is fixed on the rear side surface of the lower pressing plate 14, and a telescopic cylinder 16 is fixed on the front side surface of the mounting plate 18 through a cushion block 19. The telescopic cylinder 16 can expand and contract in the up-down direction. In this embodiment, the telescopic cylinder 16 is a three-axis cylinder. The three piston rods of the three-axis cylinder are arranged at intervals in the left-right direction and act synchronously. The upper pressing plate 15 is fixed at the lower ends of the three piston rods.

[0036] In this embodiment, the first pressing assembly further includes a second fixing base 12. The second fixing base 12 is fixedly connected to the slider 13 by bolts passing through the lower pressing plate 14. Therefore, when the slider 13 moves relative to the slide rail, the second fixing base 12 will move along with the movement of the slider 13. The second fixing base 12 includes a connecting plate vertically arranged on the left side of the lower pressing plate 14, and a connecting column fixedly connected perpendicularly to the connecting plate. Two connecting columns are arranged at intervals in the front-back direction, and bolt holes for the bolts to pass through are formed on the connecting columns. The connecting columns are arranged on the upper surface of the lower pressing plate 14, and an avoidance space for the upper pressing plate 15 is formed between the connecting columns. When the upper pressing plate 15 moves downward under the action of the telescopic cylinder 16 and clamps with the lower pressing plate 14, the upper pressing plate 15 just falls between the two connecting columns.

[0037] In this embodiment, the second pressing assembly further includes a third fixing base 26. The third fixing base 26 is fixedly connected to the slider 13 by bolts passing through the lower pressing plate 14. Therefore, when the slider 13 moves relative to the slide rail, the third fixing base 26 will move along with the movement of the slider 13. The third fixing base 26 includes a connecting plate vertically arranged on the right side of the lower pressing plate 14, and a connecting column fixedly connected perpendicularly to the connecting plate. Two connecting columns are arranged at intervals in the front-back direction, and bolt holes for the bolts to pass through are formed on the connecting columns. The connecting columns are arranged on the upper surface of the lower pressing plate 14, and an avoidance space for the upper pressing plate 15 is formed between the connecting columns. When the upper pressing plate 15 moves downward under the action of the telescopic cylinder 16 and clamps with the lower pressing plate 14, the upper pressing plate 15 just falls between the two connecting columns.

[0038] The first stretching end includes a guide rail extending in the left-right direction. The guide rail is directly fixed on the bottom plate 1, and the guide rail of the first stretching end and the slide rail of the sliding assembly are located on the same straight line. Guide grooves extending in the left-right direction are formed on the front and rear sides of the guide rail, and a guide block 7 is slidably fitted on the guide rail. A first fixing base 8 is fixed on the guide block 7. The first fixing base 8 is in an L shape and includes a first plate body fixedly connected to the guide block 7 and a second plate body fixedly connected perpendicularly to the first plate body. The first fixing base 8 is in transmission connection with the second pressing assembly.

[0039] Specifically, a tensile force display structure is provided between the first stretching end and the first pressing assembly. The pressure display structure includes a tension sensor 20 fixed to the right side of the second plate body of the first fixed seat 8, a first transmission pull ring 21 fixed to the right end of the tension sensor 20, a second transmission pull ring 11 fixed to the left side of the connecting plate of the second fixed seat 12 of the first pressing assembly, and a stretching spring 9 disposed between the first transmission pull ring 21 and the second transmission pull ring 11. When the first stretching end is pulled, the stretching spring 9 is stretched, and the stretching spring 9 will guide the slider 13 in the first sliding assembly to move relative to the slide rail, so that one end of the carbon fiber tow 17 clamped by the upper pressing plate 15 and the lower pressing plate 14 moves to the left, realizing the preliminary tensioning of the carbon fiber tow 17. The tension sensor 20 in the tensile force display structure can display the tension of the carbon fiber tow 17.

[0040] In this embodiment, the second stretching end is the second pressing assembly. A fourth fixed seat 28 is fixedly spaced on the right side of the second pressing assembly. There is a circular groove (not shown in the figure) with an opening facing right on the right side of the third fixed seat 26 in the second pressing assembly. An annular retaining edge is provided at the opening of the circular groove. A threaded hole is provided on the fourth fixed seat 28. The fine-tuning structure includes a fine-thread bolt 27. One end of the fine-thread bolt 27 is adapted to the circular groove and is rotatably disposed in the circular groove. The annular retaining edge can prevent the fine-thread bolt 27 from slipping out of the circular groove. The fine-thread bolt 27 passes through the threaded hole on the fourth fixed seat 28 and is threadedly engaged with the threaded hole. A handwheel 29 is fixed to the end of the fine-thread bolt 27 away from the fourth fixed seat 28. By rotating the handwheel 29, the handwheel 29 drives the rotation of the fine-thread bolt 27 in the threaded hole, realizing the pushing of the second stretching end, and thus realizing the fine-tuning of the tension of the carbon fiber tow 17.

[0041] In this embodiment, four groups of stretching modules are arranged at intervals in the front-rear direction. A tensioning plate 6 extending in the front-rear direction is provided at the first stretching end of the stretching module. In this embodiment, the tensioning plate 6 is fixedly connected to the first fixed seat 8 at the stretching end of each stretching module.

[0042] The carbon fiber multifilament stretching spline performance test sample tensioning device of the present invention further includes a driving device and a transmission structure provided on the bottom plate 1. The output end of the driving device is drivingly connected to one end of the transmission structure, and the transmission structure is drivingly connected to the stretching end of the stretching module. Specifically, the four groups of stretching modules share a set of driving device and transmission structure. The transmission structure is drivingly connected to the first stretching end of each stretching module through the tensioning plate 6. Moreover, the driving device and the transmission structure are arranged in the middle of the four groups of stretching modules in the front-rear direction. In this embodiment, the driving device is a servo motor 2. A servo motor mounting plate 3 is fixed to the bottom plate 1 by bolts, and the servo motor 2 is fixed to the servo motor mounting plate 3 by bolts.

[0043] The transmission structure is a lead screw nut structure. The lead screw in the lead screw nut is drivingly connected to the output end of the servo motor 2 through a coupling 36. The lead screw includes smooth shaft sections at both ends and a threaded section in the middle. The lead screw is supported on the bottom plate 1 by two bearings 4 arranged at intervals left and right. The bearings 4 are rotationally matched with the smooth shaft sections of the lead screw. A nut 35 is threadedly engaged with the threaded section, and a tensioning plate 6 is fixedly connected to the nut 35. In this embodiment, a bearing bracket 5 is provided below the bearing 4, and the bearing 4 is fixed on the bottom plate 1 through the bearing bracket 5.

[0044] When the carbon fiber multifilament tensile spline performance test sample tensioning device of the present invention is in use, first, the servo motor 2 is powered on and reset to the middle position, the telescopic cylinder 16 is connected to the air source, and the carbon fiber tow 17 is placed between the first pressing assembly and the second pressing assembly in a certain direction. The upper pressing plate 15 of the pressing assembly moves downward to clamp with the lower pressing plate 14 to clamp the end of the carbon fiber tow 17. In the same way as the first stretching module clamps the carbon fiber tow 17, the carbon fiber tow 17 is clamped on the other three stretching modules respectively. Then the servo motor 2 is started, and the servo motor 2 simultaneously tensions the first stretching ends of the four stretching modules through the transmission mechanism. During the stretching process, the carbon fiber tow 17 is quickly and preliminarily tensioned, and the tension sensor 20 displays the tension value. However, due to different operations, there will be certain differences in the initial positions where the carbon fiber tows 17 are clamped on the four stretching modules. When the servo motor 2 synchronously tensions the carbon fiber tows 17, there will be slight differences in the tension values displayed by the tension sensors 20. When the tension values of the preliminarily tensioned carbon fiber tows 17 all reach the set value, the servo motor 2 stops working; then the tension values of the carbon fiber tows 17 are adjusted respectively through the fine-tuning structure, so that the tension values of the four stretching modules are equal, and the tensioning process of the entire carbon fiber tow 17 is completed.

[0045] After each carbon fiber tow 17 is stretched and tightened and has equal tension values, the impregnating liquid is coated on the tensioned carbon fiber tow 17, and left to stand and dry to complete the preparation of the entire carbon fiber multifilament tensile test spline.

[0046] In the above embodiment, a first sliding assembly is provided below the first pressing assembly, and a second sliding assembly is provided below the second pressing assembly. Both the first pressing assembly and the second pressing assembly can move in the extending direction of the carbon fiber tow. Both ends of the stretching module are stretching ends. The left end of the stretching module is the first stretching end, and the right end of the stretching module is the second stretching end; a tension display structure is provided between the first stretching end and the first pressing assembly, and a fine-tuning structure is provided at the second stretching end; in other embodiments, only a first sliding assembly is provided below the first pressing assembly, and the second pressing assembly is fixedly arranged. At this time, one end of the stretching module is the stretching end. At this time, a tension display structure is provided between the stretching end and the first pressing assembly, and the fine-tuning structure is not provided.

[0047] In the above embodiments, a mounting plate is fixedly arranged on the lower pressing plate, and a telescopic air cylinder capable of telescoping in the up and down direction is fixed on the mounting plate, and the upper pressing plate is fixed to the lower end of the piston rod of the telescopic air cylinder; in other embodiments, a U-shaped frame is fixedly arranged on the lower pressing plate, and a telescopic air cylinder that telescopes in the up and down direction is fixed on the U-shaped frame, and the upper pressing plate is fixed to the lower end of the piston rod of the telescopic air cylinder.

[0048] In the above embodiments, the first pressing assembly includes a second fixed seat, and the second pressing assembly includes a third fixed seat; in other embodiments, the first pressing assembly does not include the second fixed seat, and at this time the second transmission pull ring is directly fixed on the lower pressing plate; the second pressing assembly also does not include the third fixed seat, and at this time, the circular groove is directly formed on the lower pressing plate.

[0049] In the above embodiments, four groups of stretching modules are arranged at intervals in the front and back directions; in other embodiments, two groups, six groups, eight groups, etc. of stretching modules are arranged at intervals in the front and back directions.

Claims

1. A tensioning device for testing the performance of a carbon fiber multifilament tensile spline sample, characterized in that, Comprising: Base plate: Horizontally arranged; Stretching module: Arranged on the base plate. The stretching module includes a first pressing component and a second pressing component for fixing the carbon fiber tow. At least one group of the first pressing component and the second pressing component is provided with a sliding component below, so that the pressing component provided with the sliding component can move in the extending direction of the carbon fiber tow. The end of the stretching module where the movable pressing component is located is the stretching end; Transmission structure: Arranged on the base plate. The transmission structure is in transmission connection with the stretching end of the stretching module; Driving device: Arranged on the base plate. The output end of the driving device is in transmission connection with one end of the transmission structure; A first sliding component is arranged below the first pressing component, and a second sliding component is arranged below the second pressing component. Both the first pressing component and the second pressing component can move in the extending direction of the carbon fiber tow. Both ends of the stretching module are stretching ends. The left end of the stretching module is the first stretching end, and the right end of the stretching module is the second stretching end; A tension display structure is arranged between the first stretching end and the first pressing component, and a fine-tuning structure is arranged at the second stretching end; The first stretching end includes a guide rail extending in the left-right direction. The guide rail and the slide rail of the sliding component are on the same straight line. The guide rail is slidably fitted with a guide block, and a first fixing seat is fixed on the guide block. The first fixing seat is in transmission connection with the transmission structure, and is in transmission connection between the first fixing seat and the first pressing component; The second pressing component includes a third fixing seat, and the third fixing seat is fixed on the lower pressing plate; A fourth fixing seat is fixedly arranged at intervals on the right side of the second pressing component; The third fixing seat is provided with a circular groove with an opening facing right, and an annular retaining edge is arranged at the opening of the circular groove. A threaded hole is opened on the fourth fixing seat. The fine-tuning structure includes a fine-thread bolt. One end of the fine-thread bolt is adapted to the circular groove and is rotatably arranged in the circular groove. The fine-thread bolt passes through the threaded hole on the fourth fixing seat and is threadedly fitted with the threaded hole. A hand wheel is fixed at the end of the fine-thread bolt away from the fourth fixing seat.

2. The tensioning device for preparing a test sample for testing the performance of a carbon fiber multifilament tensile spline according to claim 1, characterized in that, The first sliding component and the second sliding component have the same structure, and both include slide rails extending in the left-right direction relatively fixed on the base plate and sliders slidably fitted with the slide rails; The first pressing component and the second pressing component have the same structure, and both include a lower pressing plate fixed on the slider and an upper pressing plate capable of moving up and down relative to the lower pressing plate; The upper pressing plate and the lower pressing plate are arranged corresponding to each other up and down.

3. The tensioning device for preparing a test sample for testing the properties of a carbon fiber multifilament tensile spline according to claim 2, characterized in that, An installation plate is fixedly arranged on the lower pressing plate, and a telescopic cylinder capable of telescoping in the up-down direction is fixed on the installation plate. The upper pressing plate is fixed at the lower end of the piston rod of the telescopic cylinder.

4. A tensioning device for preparing a test sample of a carbon fiber multifilament tensile spline according to claim 1, characterized in that, The first pressing component includes a second fixing seat, and the second fixing seat is fixed on the lower pressing plate; The tension display structure includes a tension sensor fixed on the first fixing seat, a first transmission pull ring fixed on the right side of the tension sensor, a second transmission pull ring fixed on the second fixing seat, and a stretching spring arranged between the first transmission pull ring and the second transmission pull ring.

5. The tensioning device for preparing test samples of carbon fiber multifilament tensile spline performance according to claim 1, characterized in that, Four groups of stretching modules are arranged at intervals in the front-rear direction. A tensioning plate extending in the front-rear direction is arranged at the first stretching end of the stretching module. The tensioning plate is fixedly connected to the first stretching end of each stretching module. The transmission structure is in transmission connection with the first stretching end of each stretching module through the tensioning plate.

6. The tensioning device for preparing a test sample for testing the properties of a carbon fiber multifilament tensile spline according to claim 5, characterized in that, The transmission structure is a lead screw nut structure. The lead screw includes smooth shaft sections at both ends and a threaded section in the middle. The lead screw is supported on the bottom plate by two bearings arranged at intervals left and right. The bearings are rotationally matched with the smooth shaft sections of the lead screw, and a nut is threadedly fitted on the threaded section. The tension plate is fixedly connected to the nut.

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