Preparation tool for carbon fiber multifilament tensile sample

Abstract

The utility model relates to the technical field of carbon fiber multifilament preparation tools, and particularly discloses a carbon fiber multifilament tensile sample preparation tool which comprises a fiber winding assembly, an adjusting assembly and a supporting assembly. The fiber winding assembly comprises two fiber winding plates, a plurality of multifilament placing grooves are formed in the upper side face and the lower side face of each fiber winding plate, and the multifilament placing grooves can prevent samples from curling and being uneven; connecting ends are further arranged at the two ends of the fiber winding plates, adjusting assemblies are arranged at the connecting ends, the distance between the two carbon fiber winding plates can be adjusted, then the tension of wound carbon fibers is adjusted, and the dispersion influence of non-uniform tension of the carbon fibers on a test result is reduced; the fiber winding plate is flat and straight, a reinforcing sheet can be conveniently prepared in a sample clamping area under the positioning action of the multifilament placing groove, the obtained sample is flat, uniform, easy to clamp and uniform in stress, and the risk that the sample is damaged due to clamping is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon fiber multifilament preparation tooling, in particular to a preparation tooling for a carbon fiber multifilament tensile test sample. Background Art

[0002] Carbon fiber refers to high-strength, high-modulus fibers with a carbon content of over 90%. Its high-temperature resistance is the highest among all chemical fibers. Made from acrylic and viscose fibers through high-temperature oxidation and carbonization, it is an excellent material for the manufacture of high-tech equipment such as aerospace.

[0003] Existing winding frame tooling for carbon fiber multifilament tensile specimens is diverse. Multifilament specimens mainly made of a frame composed of round rods are prone to curling into a rod shape as a whole in the middle test area formed by the round frame; curling and unevenness may even occur in the clamping area of ​​the specimen, thereby affecting the adhesion of the reinforcement sheet, resulting in uneven clamping force during testing and scattered tensile test data. Some of them will solidify the spline and reinforcement sheet on the carbon fiber multifilament at the same time, but most of them are single-sided reinforced, and the reinforced area still has a single-sided weakness. The clamping area is still easily damaged during the test, affecting the test results. Therefore, a preparation tool for carbon fiber multifilament tensile specimens is proposed. Summary of the Invention

[0004] The purpose of the present utility model is to provide a preparation tool for carbon fiber multifilament tensile specimens, so as to solve the problem proposed in the above background technology that the existing carbon fiber multifilament specimen winding frame tooling is diverse, and the multifilament specimens mainly made of a frame composed of round rods are prone to curling into a rod shape as a whole in the middle test area formed by the round frame; even curling and unevenness may occur in the clamping area of ​​the specimen, thereby affecting the adhesion of the reinforcement sheet, resulting in uneven clamping force during the test and scattered tensile test data; there are also simultaneous curing of splines and reinforcement sheets, but most of them are single-sided reinforcement, and the reinforcement area is still weak on one side. During the test, the clamping area is still easily damaged first, affecting the test results.

[0005] To achieve the above-mentioned purpose, the present utility model provides the following technical solutions: a tool for preparing carbon fiber multifilament tensile specimens, comprising a fiber winding assembly and an adjustment assembly;

[0006] The fiber winding assembly includes two relatively arranged fiber winding plates, and a plurality of multifilament placement grooves are opened on the upper and lower side surfaces of the two fiber winding plates, and the multifilament placement grooves are used to position and lay the carbon fibers to be tested; the carbon fiber bundles are spirally wound on the two fiber winding plates along the multifilament placement grooves in turn, and the carbon fiber segments close to the multifilament placement grooves form the clamping area of ​​the sample, and the carbon fiber segments between the two fiber winding plates form the effective testing area of ​​the sample.

[0007] The adjustment assembly includes two second screws and a first nut, the second screws are connected to the two fiber winding plates in a "#" shape; the fiber winding plates are movably arranged along the second screws; two first nuts are provided on each second screw, which are respectively abutted against the inner side of the fiber winding plate; the first nut and the second screw are used to cooperate to adjust the distance between the two fiber winding plates.

[0008] Preferably, the carbon fiber multifilament tensile specimen preparation tool further includes a support assembly; the support assembly includes two fixed claws, which are respectively arranged on the outside of the second screw and are connected and fixed to the connecting end of the fiber winding plate.

[0009] Preferably, the fixing claw includes a first mounting plate and a second mounting plate, wherein both ends of the first mounting plate are connected to the connecting ends of the fiber winding plate; and the second mounting plate is arranged outside the first mounting plate.

[0010] Preferably, a U-shaped through hole is provided at each connecting end of the fiber winding plate, and a corresponding U-shaped through hole is also provided at each end of the first connecting plate of the fixing claw; a first screw is inserted into the U-shaped through hole on the connecting end of the fiber winding plate and the first mounting plate to connect and fix the fiber winding plate to the first mounting plate; a nut is provided at one end of the first mounting plate, and a second nut is provided on the other end.

[0011] Preferably, the angle between the multifilament placement groove and the horizontal edge of the fiber winding plate is between 85-89.2°.

[0012] Preferably, the area between the two fiber winding plates is an effective testing area for the carbon fiber multifilament tensile sample.

[0013] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects: on the one hand, the present invention adopts a plate-shaped fiber winding frame and provides a groove on the fiber winding plate, thereby avoiding the curling and unevenness of the sample caused by the use of a round rod-shaped frame in the prior art; on the other hand, by providing an adjustment component at both ends of the fiber winding plate, the first nut of the adjustment component cooperates with the second screw to adjust the distance between the two fiber winding plates, thereby adjusting the effective testing area of ​​the carbon fiber multifilament and realizing the convenient adjustment of the tension of the wound carbon fiber, thereby reducing the dispersion effect of the uneven tension of the carbon fiber on the test results; thirdly, the design of the multifilament placement groove in the present invention facilitates the preparation of double-sided reinforcement sheets when making samples. The prepared sample is flat, easy to clamp, and evenly stressed, reducing the risk of sample damage due to clamping. Using this tooling, a carbon fiber multifilament sample with double-sided reinforcement and straight end faces can be prepared at one time, effectively improving the sample preparation efficiency of the tensile sample. At the same time, the double-sided reinforcement of the carbon fiber multifilament improves the end clamping strength, ensures uniform force, and improves the stability of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 This is a schematic structural diagram of the utility model from a first perspective;

[0016] Figure 2 This is a schematic diagram of the structure of the utility model from a second perspective;

[0017] Figure 3 This is a schematic diagram of the top structure of the utility model;

[0018] Figure 4 This is a schematic diagram of the main structure of the utility model;

[0019] Figure 5 It is a schematic diagram of the bottom structure of the utility model.

[0020] Explanation of the accompanying drawings: 1. Connection end; 2. Fiber winding plate; 3. Multifilament placement groove; 4. First nut; 5. U-shaped through hole; 6. First mounting plate; 7. Second mounting plate; 8. Second nut; 9. First screw; 10. Second screw; 11. Nut; 12. Through hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application. Example

[0024] In the prior art, there are various winding frame toolings for existing carbon fiber multifilament specimens. Multifilament specimens mainly made of a frame composed of round rods are prone to curling into a rod shape as a whole in the middle test area formed by the round frame; curling and unevenness may even occur in the clamping area of ​​the specimen, thereby affecting the adhesion of the reinforcement sheet, resulting in uneven clamping force during testing and scattered tensile test data. Some of them will solidify the splines and reinforcement sheets on the carbon fiber multifilament at the same time, but most of them are reinforced on one side, and the reinforced area is still weak on one side. The clamping area is still easily damaged during the test, affecting the test results.

[0025] See also Figure 1-5 The utility model provides a technical solution: a preparation tool for carbon fiber multifilament tensile test specimens, including a fiber winding assembly, an adjustment assembly and a support assembly. The fiber winding assembly includes two fiber winding plates 2 arranged opposite to each other, and a plurality of multifilament placement grooves 3 are opened on the upper and lower side surfaces of the two fiber winding plates 2; the angle between the multifilament placement grooves 3 and the horizontal edges of the fiber winding plates 2 is 85-89.2°, so that the fibers can be spirally wound on the multifilament placement grooves 3 of the two fiber winding plates 2, and the fiber segments attached to the multifilament placement grooves 3 form the clamping area of ​​the sample, and the fiber segments located between the two fiber winding plates 2 form the effective testing area of ​​the sample. Regardless of the clamping area or the effective testing area of ​​the sample, the fibers can be ensured to be flat and evenly distributed, and the tension they are subjected to is consistent; the fiber winding plates 2 are also provided with connecting ends 1 at both ends;

[0026] A U-shaped through hole 5 is provided at each connecting end of the filament winding plate, and a corresponding U-shaped through hole 5 is also provided at each end of the first connecting plate 6 of the fixing claw; a first screw 9 is inserted into the U-shaped through hole 5 on the connecting end 1 of the filament winding plate 2 and the first mounting plate 6 to connect and fix the filament winding plate 2 to the first mounting plate 6; a nut 11 is provided at one end of the first mounting plate 6, and a second nut 8 is provided on the other end;

[0027] The adjustment assembly includes two second screws 10 and a first nut 4. Each connection end 1 of the fiber winding plate 2 is provided with a through hole 12 that cooperates with the second screw 10. The two second screws 10 respectively pass through the through holes 12 of the connection end 1 and are connected to the fiber winding plate 2 in a "#" shape. Two first nuts 4 are respectively provided on the second screw 10, each abutting the inner side of the fiber winding plate 2. According to the required length of the effective test area of ​​the specimen, the spacing between the two fiber winding plates 2 is adjusted, and then the first nut 4 is abutted and fixed to the inner side of the fiber winding plate 2 to begin fiber winding. After winding is completed, the position of the second nut 4 can be appropriately adjusted to ensure that the fiber is tensioned and straight.

[0028] The support assembly includes two fixed jaws, one positioned outside the second screw 10. The fixed jaws include a first mounting plate 6 and a second mounting plate 7, with the second mounting plate 7 secured to one side of the first mounting plate 6. Corresponding U-shaped through-holes 5 are provided at both ends of the first mounting plate 6 and at the connecting end 1 of the filament winding plate 2. A first screw 9 passes through the U-shaped through-holes in the first mounting plate 6 and the filament winding plate 2 and is tightened with a second nut 8 to secure the fixed jaws to the filament winding plate 2. The fixed jaws facilitate fiber winding with a handheld tool or can be mounted on a winding machine, where a program is used to rotate the tool for automated fiber winding.

[0029] Working process:

[0030] (1) Insert the two second screw rods 10 through the through holes 12 on the connecting end 1 of the fiber winding plate 2, adjust the distance between the two fiber winding plates 2, and then fix them with the first nut 4. Use the first screw rod 9 to pass through the U-shaped through holes 5 on the connecting end 1 and the first mounting plate 6 in turn, and fix them with the second nut 8 to complete the installation of the support assembly. Then, install the tooling on the winding machine frame.

[0031] (2) Clean the surface of the fiber winding plate 2 and spray a release agent on the inner side of the multifilament placement groove 3. Paste a double-sided tape on the bottom upper wall of the multifilament placement groove 3. Cut fibers equal to the length of the multifilament placement groove, preferably the same fibers as the test batch, and paste them on the double-sided tape in the multifilament placement groove 3 to form a single-sided reinforcement sheet. Then, manually or automatically rotate the tooling to spirally wind the fiber to be tested along the multifilament placement groove 3.

[0032] (3) After winding is completed, loosen the second nut 8 of the fixed claw, and then adjust the first nut 4 on the second screw 10 so that the carbon fibers inside the multifilament placement groove 3 are tensioned and straightened; then stop rotating the first nut 4, and rotate the second nut 8 to tighten the first mounting plate 6 and the fiber winding plate 2;

[0033] (4) Paste double-sided tape on the upper surface of the carbon fiber layer in the multifilament placement groove 3, and then lay another layer of fiber with the same length as the multifilament placement groove 3 to form a reinforcement sheet on the second side;

[0034] (5) Manually drip glue to soak the fiber or immerse the entire tooling in the glue tank, then wipe off the excess glue and transfer the entire tooling to the oven for heating and curing;

[0035] (6) Finally, the cured carbon fiber multifilament is cut to a suitable length for subsequent carbon fiber multifilament tensile test.

[0036] In summary, this tooling can adjust the distance between the two carbon fiber winding plates 2 through the action of the first nut 4 and the second screw 10 on the two end sides of the fiber winding plate 2, thereby realizing the convenient adjustment of the tension of the wound carbon fiber and reducing the dispersion effect of the uneven carbon fiber tension on the test results. The design of the multifilament placement groove 3 can facilitate the pasting of fiber reinforcement sheets on both sides of the sample clamping area when winding the fiber, so as to strengthen the sample clamping area. The fiber winding plate 2 is straight, and the prepared sample is flat, easy to clamp, and uniformly stressed, which reduces the risk of sample damage due to clamping. Using this tooling, a straight carbon fiber multifilament sample can be prepared at one time, which effectively improves the sample preparation efficiency of the tensile sample. At the same time, the double-sided reinforcement of the carbon fiber multifilament improves the end clamping strength, ensures uniform stress, and improves the stability of the test data.

[0037] Those skilled in the art will appreciate that various combinations and / or combinations of features described in the various embodiments and / or claims of the present invention may be employed, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, various combinations and / or combinations of features described in the various embodiments and / or claims of the present invention may be employed without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

Claims

1. A tool for preparing carbon fiber multifilament tensile test specimens, characterized by: The invention comprises a fiber winding assembly and an adjustment assembly; the fiber winding assembly comprises two fiber winding plates (2) arranged opposite to each other, and a plurality of multifilament placement grooves (3) are provided on the upper and lower sides of the two fiber winding plates (2), and the multifilament placement grooves (3) are used to position and lay the carbon fibers to be tested; the fiber winding plates (2) are also provided with connection ends (1) at both ends; the adjustment assembly comprises two second screw rods (10) and first nuts (4), and the second screw rods (10) are connected to the two fiber winding plates (2) arranged opposite to each other in a "#" shape; the fiber winding plates (2) are movably arranged along the second screw rods (10); two first nuts (4) are provided on each second screw rod (10), respectively abutting against the inner side of the fiber winding plate; the first nuts (4) cooperate with the second screw rods (10) to adjust the spacing between the two fiber winding plates (2).

2. The tool for preparing a carbon fiber multifilament tensile test specimen according to claim 1, characterized in that: It also includes a support assembly, which includes two fixed claws, which are respectively arranged on the outside of the second screw (10) and are connected and fixed to the connection end (1) of the fiber winding plate (2).

3. The tool for preparing a carbon fiber multifilament tensile test specimen according to claim 2, characterized in that: The fixed clamping claw comprises a first mounting plate (6) and a second mounting plate (7), wherein both ends of the first mounting plate (6) are connected to the connecting end (1) of the fiber winding plate (2); and the second mounting plate (7) is arranged on the first mounting plate (6).

4. The tool for preparing a carbon fiber multifilament tensile test specimen according to claim 3, characterized in that: A U-shaped through hole (5) is provided at each connection end (1) of the fiber winding plate (2), and a corresponding U-shaped through hole (5) is also provided at each end of the first connection plate (6) of the fixed claw; a first screw rod (9) is inserted into the U-shaped through hole (5) on the connection end (1) of the fiber winding plate (2) and the first mounting plate (6) to connect and fix the fiber winding plate (2) and the first mounting plate (6); a nut (11) is provided at one end of the first mounting plate (6), and a second nut (8) is provided at the other end.

5. The tool for preparing a carbon fiber multifilament tensile test specimen according to claim 4, characterized in that: The angle between the multifilament placement groove (3) and the horizontal edge of the fiber winding plate (2) is between 85° and 89.2°.

6. The tool for preparing a carbon fiber multifilament tensile test specimen according to claim 5, characterized in that: The fiber section between the two fiber-wound plates (2) forms an effective testing area of ​​the sample.

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