CN115290411A - Tool and method for preparing carbon fiber multifilament tensile sample - Google Patents

Abstract

The invention provides a tool and a method for preparing a carbon fiber multifilament tensile sample, which comprises the following steps: support, dead lever, gag lever post, pulley, spring balance, frame and fixing bolt, the frame passes through the dead lever and installs on the support, be provided with the C type on the dead lever and press from both sides, the gag lever post includes first gag lever post and second gag lever post, be provided with the pulley on the gag lever post, the second gag lever post sets up the lower extreme at the frame, the upper portion of frame is provided with the spacing groove, peg graft at the spacing inslot at the both ends of first gag lever post, be provided with the locating hole on the frame of spacing groove upper end, fixing bolt installs in the locating hole, first gag lever post is connected to the one end of spring balance, and fixing bolt is connected to the other end, and preparation carbon fiber multifilament tensile sample's frock and method in this application can obviously improve carbon fiber multifilament tensile sample's quality and test data's accuracy, reduces test data's discreteness.

Description

Tooling and method for preparing carbon fiber multifilament tensile sample

technical field

The invention relates to the technical field of composite material detection, in particular to a tool and a method for preparing a carbon fiber multifilament tensile sample.

Background technique

Carbon fiber materials have a wide range of applications, especially thanks to their high strength properties, they can be applied to the production of a variety of special products, such as composite gas cylinders that need to withstand higher pressure. In order to ensure the performance of the obtained product, it is generally necessary to determine through various tests that the performance of the carbon fiber used meets the requirements.

Multifilament tensile properties are one of the important indicators to investigate the properties of carbon fiber bundles. Its mechanical properties can be used for finite element analysis and evaluation of carbon fiber body properties. In order to truly simulate the stress of carbon fibers, carbon fiber multifilament tensile performance tests are usually selected. The key point of the multifilament tensile performance test is the production of the multifilament sample. The sample preparation methods are divided into manual and mechanical. The mechanical sample preparation procedure is complex, and the processing requirements for the sample preparation workpiece are difficult, and the assembly and coordination accuracy is high, so it is not suitable Large-scale promotion, manual sample preparation is still a commonly used technology in the current industry because of its convenient process. The key points for making the sample itself are glue content control, tension control, and straight yarn shape. Tension control includes: the uniformity of tension inside the yarn bundle, the uniformity of tension in different samples, and the size of the tension. The common phenomenon of sample preparation in the industry is that the requirements for glue content are low and easy to control, but the tension control and sample width are only manually adjusted by people, and there are big differences between different people operating and different samples operated by the same person. , this kind of spline is prone to abnormal damage during the test process, which seriously affects the discreteness and accuracy of the test results. At present, there is no suitable tooling and sample preparation method.

The publication number is CN113884368A, and the invention patent titled "a carbon fiber tensile sample preparation method, preparation frame and sample" discloses another sample preparation method for carbon fiber samples, which mainly includes twisting each strand of carbon fiber into a round rod Shaped parallel to each other and fixed on the preparation frame, then adjust the sliding plate so that each strand of carbon fiber has the same tension, then evenly coat the carbon fiber with epoxy resin and let it stand for the epoxy resin to soak the carbon fiber, and wipe off the excess ring The first semi-finished sample is obtained after the epoxy resin glue is dripped. After the first curing process is performed on the first semi-finished sample, carbon fibers with a suitable length are cut off to obtain the second semi-finished sample, and the two ends of the second semi-finished sample are fixed and pasted with quick-drying glue. Reinforcement sheet, get the third semi-finished sample, fix the third semi-finished sample and paste the two ends of the reinforcement sheet and immerse it in epoxy resin, then take it out and control it to dry until the epoxy resin no longer drips, wipe off the excess epoxy resin glue After dripping, the finished sample is obtained through the second curing process; although this method can also make carbon fiber samples, there are still many defects. After the carbon fibers are wound on the fixed plate and the sliding plate, it is difficult to stretch the carbon fibers only by compression springs. It is very difficult. On the one hand, the carbon fiber has a large friction force in the dry yarn state. It is difficult for the sliding plate to transmit the tension. It can only move relative to the frame, and it is difficult to make the tension uniform. Fixed, the uniformity of the length of the single fiber inside the carbon fiber yarn cannot be guaranteed.

Contents of the invention

In view of this, the present invention aims to propose a tooling and method for preparing carbon fiber multifilament tensile samples to solve the problem of uneven tension and poor straightness when preparing carbon fiber samples in the prior art, which causes the sample to be easily damaged during the test process. Abnormal damage occurs, which seriously affects the discreteness and accuracy of test results.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A tooling for preparing a carbon fiber multifilament tensile sample, comprising: a support, a fixed rod, a limit rod, a pulley, a spring balance, a frame and a fixing bolt, the frame is installed on the support through a fixed rod, and the fixed rod A C-shaped clip is arranged on the top, and the limit rod includes a first limit rod and a second limit rod. A pulley is arranged on the limit rod, and the second limit rod is arranged at the lower end of the frame. The upper part of the frame is provided with a limit slot, the two ends of the first limit rod are plugged into the limit slot, the frame at the upper end of the limit slot is provided with a positioning hole, and the fixing bolt is installed in the positioning hole Inside, one end of the spring scale is connected to the first limit rod, and the other end is connected to the fixing bolt.

The tooling for preparing carbon fiber multifilament tensile samples in this application fixes the carbon fiber yarn through a C-shaped clamp, which is firm and easy to use. The carbon fiber yarn is wound on the pulley, and the groove width of the pulley can be adjusted according to actual needs. It is convenient to make samples of different specifications, and the rotation of the pulley and sliding left and right can effectively avoid the problem of internal stress concentration of the sample, so that the sample is evenly stressed and straight, and the spring balance can make the tension of the sample consistent and stable. The bolts can adjust the position of the spring scale, which is convenient for adjusting the tensile force on the sample. When winding the carbon fiber yarn, the frame can rotate on the support, so that the carbon fiber yarn is evenly wound on the pulley. This structure is efficient and stable in sample preparation. Easy to operate.

Further, the C-shaped clip includes a first C-shaped clip and a second C-shaped clip.

The clamping end of the C-shaped clamp is a flat surface. When clamping the carbon fiber yarn, the flat surface can ensure that the tension of each yarn is the same, so that the yarn is evenly stressed. At the beginning of the carbon fiber yarn winding, Use the first C-shaped clip to fix the starting end of the yarn, and when the yarn is wound, use the second C-shaped clip to fix the end of the yarn, and the C-shaped clip can slide freely on the fixed rod, this structure is fixed Strong and easy to use.

Further, the limiting groove includes a first limiting groove and a second limiting groove, the first limiting groove is arranged on the left side of the frame, and the second limiting groove is arranged on the left side of the frame On the right side, the first limiting groove and the second limiting groove are symmetrical and parallel.

The first limiting groove is parallel to the second limiting groove, so that the first limiting rod can be kept parallel to the second limiting rod, so that the carbon fiber yarn is straight and evenly stressed.

Further, the left end of the first limiting rod is plugged into the first limiting groove, the right end of the first limiting rod is inserted into the second limiting groove, and the first limiting rod The limit rod can move in the limit slot.

This structure facilitates the installation and disassembly of the first limiting rod, and is also conducive to the movement of the first limiting rod in the limiting groove.

Further, the number of pulleys provided on the first limit rod and the second limit rod is the same, and the pulleys on the first limit rod and the second limit rod correspond to each other in the vertical direction.

The pulleys arranged on the first limit rod and the second limit rod correspond one to one, and this structure is convenient for keeping the yarn straight when winding the carbon fiber yarn, and is also convenient for operation.

Further, the positioning hole includes a first positioning hole and a second positioning hole, the first positioning hole is set on the left side of the frame, the second positioning hole is set on the right side of the frame, the The first positioning hole and the second positioning hole are symmetrical and parallel.

This structure is convenient for installing the fixing bolts, and when the spring balance is connected to the fixing bolts and the first limiting rod, the two ends of the first limiting rod can be parallel and uniformly stressed.

Further, the fixing bolts include first fixing bolts and second fixing bolts, the first fixing bolts are installed in the first positioning holes, and the second fixing bolts are installed in the second positioning holes.

The front end and the rear end of the first fixing bolt are respectively provided with a nut, the nut at the front end abuts against the left end face of the first positioning hole, and the nut at the rear end abuts against the right end of the first positioning hole, thereby fixing the first fixing bolt In the first positioning hole, the fixing method of the second fixing bolt is the same as that of the first fixing bolt.

Further, the spring balance includes a first spring balance and a second spring balance, the upper end of the first spring balance is connected to the first fixing bolt, the lower end is connected to one end of the first limit rod, and the upper end of the second spring balance is connected to The lower end of the second fixing bolt is connected to the other end of the first limiting rod.

By adjusting the tension of the first spring balance and the second spring balance, the two ends of the first limit rod are subjected to the same force, thereby ensuring that the sample is straight and uniformly stressed.

The present invention also provides a method for preparing a carbon fiber multifilament tensile sample based on the above-mentioned tooling, including:

S1. Select pulleys of corresponding quantity and specifications according to the sample requirements, and install the corresponding pulleys on the limit rods, and then install the limit rods on the frame;

S2. Place the frame vertically, and adjust the distance between the first limit rod and the second limit rod as required;

S3. After the tooling is ready, wrap one end of the carbon fiber yarn on the fixing rod in the middle of the frame, and then fix it with the first C-clip;

S4. Wrap the fixed carbon fiber yarns in the pulley grooves of the first limit rod and the second limit rod in sequence, and cut the carbon fiber yarn after winding;

S5, wind the carbon fiber yarn cut in step S4 on the fixing rod, and then fix it with the second C-shaped clip 212;

S6, using the mixed epoxy resin to infiltrate the carbon fiber yarn;

S7. After the carbon fiber yarn is soaked with epoxy resin, use the first spring balance to hook one end of the first limit rod, use the second spring balance to hook the other end of the second limit rod, and then stretch the first spring balance and the second Two spring scales, so that the pulling force of the first spring balance and the second spring balance reaches a preset value;

S8. Use fixing bolts to fix the spring scale in the positioning hole of the frame, and adjust the position of the fixing bolts to make the tension of the spring balance reach a preset value;

S9. According to the standard GB/T 3362-2017, control the size of the sample test area and the size of the reinforcement sheet. The two ends of the sample are respectively bonded and clamped with reinforcement sheets, and then cured. After the sample is cured, follow the standard GB/T3362- In 2017, the reinforcement sheet was divided to obtain the carbon fiber multifilament tensile sample.

In step S2, the size of the sample is changed by adjusting the distance between the first limiting rod and the second limiting rod.

In step S4, the carbon fiber yarn is first wound around the corresponding first group of pulleys on the first limit rod and the second limit rod, and after the yarn completely covers the grooves of the first group of pulleys, the second group of pulleys is then wound. Complete winding of the corresponding pulleys on the first stop bar and the second stop bar in turn, and then cut the carbon fiber yarn.

In step S7, after the carbon fiber yarn is infiltrated with epoxy resin, the yarn is stretched with a spring balance, and the yarn will automatically slide and adjust alignment under the lubrication of the resin, which facilitates the production of samples.

In step S9, kraft paper or fiberglass molded board can be selected as the reinforcing sheet, and then the reinforcing sheet is bonded to both ends of the sample with epoxy structural adhesive.

Further, the distance D between the first limiting rod and the second limiting rod is ≥350mm.

Compared with the prior art, the tooling and method for preparing carbon fiber multifilament tensile samples of the present invention have the following advantages:

First, it can effectively control the tension of the carbon fiber yarn, so that the tension of each sample is uniform and the size is controllable; second, it can make the sample straight and uniform in width, avoiding distortion and deformation of the sample; third, The tension of the sample can be precisely controlled by the spring scale, which is convenient for studying the best multifilament drawing tension; fourth, compared with the conventional method, the tensile strength and dispersion of the sample are greatly improved; both The preparation tooling and method in the present application can significantly improve the quality of the carbon fiber multifilament tensile sample and the accuracy of the test data, and reduce the discreteness of the test data.

Description of drawings

Fig. 1 is the structural representation of the first viewing angle of the tooling for preparing carbon fiber multifilament tensile samples in the present invention;

Fig. 2 is a structural schematic diagram of a second viewing angle of the tooling for preparing a carbon fiber multifilament tensile sample in the present invention.

Explanation of reference signs:

1-support, 2-fixing rod, 21-C-type clamp, 211-first C-type clamp, 212-second C-type clamp, 3-limit rod, 31-first limit rod, 310-limit Slot, 311-the first limit groove, 312-the second limit groove, 32-the second limit rod, 4-pulley, 5-spring balance, 51-the first spring balance, 52-the second spring balance, 6-frame, 7-fixing bolt, 71-the first fixing bolt, 72-the second fixing bolt, 8-positioning hole, 81-the first positioning hole, 82-the second positioning hole.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Example 1

As shown in Figure 1-2, a tool for preparing carbon fiber multifilament tensile samples includes: support 1, fixed rod 2, limit rod 3, pulley 4, spring balance 5, frame 6 and fixing bolt 7, the The frame 6 is installed on the support 1 through the fixed rod 2, the fixed rod 2 is provided with a C-shaped clip 21, the limiting rod 3 includes a first limiting rod 31 and a second limiting rod 32, the The stop bar 3 is provided with a pulley 4, the second stop bar 32 is arranged at the lower end of the frame 6, the top of the frame 6 is provided with a stop slot 310, and the two ends of the first stop bar 31 are inserted In the limiting groove 310, the frame 6 at the upper end of the limiting groove 310 is provided with a positioning hole 8, the fixing bolt 7 is installed in the positioning hole 8, and one end of the spring scale 5 is connected to the first limiting rod 31, the other end is connected with the fixing bolt 7.

The tooling for preparing carbon fiber multifilament tensile samples in this application fixes the carbon fiber yarn through the C-shaped clamp 21, which is firm and easy to use. The carbon fiber yarn is wound on the pulley 4, and the groove width of the pulley 4 can be adjusted according to actual needs. Adjustment is convenient for making samples of different specifications, and the problem of internal stress concentration of the sample can be effectively avoided through the rotation and left and right sliding of the pulley 4, so that the sample is stressed evenly and straightly, and the spring balance 5 can make the tension of the sample Consistent and stable, the fixed bolt 7 can adjust the position of the spring scale 5, which is convenient to adjust the tensile force on the sample. When winding carbon fiber yarn, the frame 6 can rotate on the support 1, so that the carbon fiber yarn can be evenly wound on the pulley 4 In terms of structure, sample preparation is efficient, stable and easy to operate.

As a preferred example of the present invention, the C-shaped clip 21 includes a first C-shaped clip 211 and a second C-shaped clip 212 .

Specifically, the clamping end of the C-shaped clamp 21 is a flat surface. When clamping the carbon fiber yarn, the flat surface can ensure that the tension of each yarn is the same, so that the yarn is evenly stressed. At the beginning of winding, use the first C-shaped clip 211 to fix the starting end of the yarn. After the yarn winding is completed, use the second C-shaped clip 212 to fix the end of the yarn, and the C-shaped clip 21 can be placed on the fixed rod 2 Sliding freely on the top, this structure is firmly fixed and easy to use.

As a preferred example of the present invention, the limiting groove 310 includes a first limiting groove 311 and a second limiting groove 312, the first limiting groove 311 is arranged on the left side of the frame 6, the The second limiting groove 312 is disposed on the right side of the frame 6 , and the first limiting groove 311 and the second limiting groove 312 are symmetrical and parallel.

Specifically, the first limiting groove 311 and the second limiting groove 312 are parallel, so that the first limiting rod 31 can be kept parallel to the second limiting rod 32 , so that the carbon fiber yarn is straight and stressed evenly.

Preferably, the limiting groove 310 is a blind groove, which can limit the first limiting rod 31 .

Preferably, the vertical section of the limiting groove 310 is rectangular, so that the first limiting rod 311 can move up and down in the limiting groove 310, and the distance between the first limiting rod 311 and the second limiting rod 312 can be changed. , and then change the tension force on the carbon fiber yarn, and facilitate the tensioning of the carbon fiber yarn during the operation.

As a preferred example of the present invention, the left end of the first limiting rod 31 is inserted into the first limiting groove 311, and the right end of the first limiting rod 31 is inserted into the second limiting groove. and the first limiting rod 31 can move in the limiting groove 310 .

Specifically, this structure facilitates the installation and disassembly of the first limiting rod 31 , and also facilitates the movement of the first limiting rod 31 in the limiting groove 310 .

As a preferred example of the present invention, the number of pulleys 4 provided on the first limiting rod 31 and the second limiting rod 32 is the same, and the pulleys 4 on the first limiting rod 31 and the second limiting rod 32 One-to-one correspondence in the vertical direction.

Specifically, the pulleys 4 provided on the first limiting rod 31 and the second limiting rod 32 correspond one-to-one. This structure is convenient for keeping the yarn straight and easy to operate when winding the carbon fiber yarn.

As a preferred example of the present invention, the positioning hole 8 includes a first positioning hole 81 and a second positioning hole 82, the first positioning hole 81 is arranged on the left side of the frame 6, and the second positioning hole 82 is disposed on the right side of the frame 6, and the first positioning hole 81 and the second positioning hole 82 are symmetrical and parallel.

Specifically, this structure facilitates the installation of the fixing bolt 7, and when the spring balance 5 is connected to the fixing bolt 7 and the first limiting rod 31, both ends of the first limiting rod 31 can be parallel and evenly stressed.

Preferably, the positioning hole 8 is a through hole, which is convenient for installing the fixing bolt 7 .

Preferably, the vertical cross-section of the positioning hole 8 is rectangular, so that the fixing bolt 7 has a larger adjustment distance, and it is convenient to adjust the tension of the spring balance 5 .

As a preferred example of the present invention, the fixing bolt 7 includes a first fixing bolt 71 and a second fixing bolt 72, the first fixing bolt 71 is installed in the first positioning hole 81, and the second fixing bolt 72 Installed in the second positioning hole 82.

Specifically, the front end and the rear end of the first fixing bolt 71 are respectively provided with a nut, the nut at the front end abuts against the left end surface of the first positioning hole 81, and the nut at the rear end abuts against the right end of the first positioning hole 81, thereby The first fixing bolt 71 is fixed in the first positioning hole 81 , and the fixing method of the second fixing bolt 72 is the same as that of the first fixing bolt 71 .

As a preferred example of the present invention, the spring balance 5 includes a first spring balance 51 and a second spring balance 52, the upper end of the first spring balance 51 is connected to the first fixing bolt 71, and the lower end is connected to the first limit rod 31, the upper end of the second spring balance 52 is connected to the second fixing bolt 72, and the lower end is connected to the other end of the first limit rod 31.

Specifically, by adjusting the tension of the first spring balance 51 and the second spring balance 52, the two ends of the first limit rod 31 are subjected to the same force, thereby ensuring that the sample is straight and uniformly stressed.

Preferably, a mechanical spring balance or a digital spring balance can be used.

Example 2

As shown in Figure 1-2, a method for preparing a carbon fiber multifilament tensile sample includes:

S1. Select pulleys 4 of corresponding quantity and specifications according to the sample requirements, and install the corresponding pulleys 4 on the limit rod 3, and then install the limit rod 3 on the frame 6;

S2. Place the frame 6 vertically, and adjust the distance between the first stop bar 31 and the second stop bar 32 as required;

S3, after the tooling is ready, wrap one end of the carbon fiber yarn on the fixing rod 2 in the middle of the frame 6, and then fix it with the first C-shaped clip 211;

S4. Wrap the fixed carbon fiber yarn in the pulley 4 grooves of the first stop bar 31 and the second stop bar 32 in sequence, and cut the carbon fiber yarn after the winding is completed;

S5, wind the carbon fiber yarn cut in step S4 on the fixing rod 2, and then fix it with the second C-shaped clip 212;

S6, using the mixed epoxy resin to infiltrate the carbon fiber yarn;

S7. After the carbon fiber yarn is infiltrated with epoxy resin, use the first spring balance 51 to hook one end of the first limit rod 31, use the second spring balance 52 to hook the other end of the second limit rod 32, and then stretch the first A spring balance 51 and a second spring balance 52, so that the pulling force of the first spring balance 51 and the second spring balance 52 reaches a preset value;

S8, using the fixing bolt 7 to fix the spring scale 5 in the positioning hole 8 of the frame 6, by adjusting the position of the fixing bolt 7, the pulling force of the spring balance 5 reaches a preset value;

S9. According to the standard GB/T 3362-2017, control the size of the sample test area and the size of the reinforcement sheet. The two ends of the sample are respectively bonded and clamped with reinforcement sheets, and then cured. After the sample is cured, follow the standard GB/T3362- In 2017, the reinforcement sheet was divided to obtain the carbon fiber multifilament tensile sample.

In step S2, the size of the sample is changed by adjusting the distance between the first limit rod 31 and the second limit rod 32, but the distance D between the first limit rod 31 and the second limit rod 32≥ 350mm.

In step S4, the carbon fiber yarn is first wound around the corresponding first group of pulleys 4 on the first stop bar 31 and the second stop bar 32, and after the yarn completely covers the grooves of the first group of pulleys 4, it is then wound around the first group of pulleys 4. The two sets of pulleys 4 complete the winding of the corresponding pulleys 4 on the first stop bar 31 and the second stop bar 32 in turn, and then cut the carbon fiber yarn.

In step S7, after the carbon fiber yarn is infiltrated with epoxy resin, the yarn is stretched using the spring balance 5, and the yarn will automatically slide and adjust alignment under the lubrication of the resin, which is convenient for the production of the sample.

In step S9, kraft paper or fiberglass molded board can be selected as the reinforcing sheet, and then the reinforcing sheet is bonded to both ends of the sample with epoxy structural adhesive.

Preferably, select a long strip of FRP molded plate with a width of 50mm as the reinforcement sheet, and control the size of the sample test area according to the requirements of GB/T3362-2017. The samples are parallel to each other and the gaps are equal, and then they are cured. Here, the reinforcing sheet can be cured in a curing furnace. After the curing is completed, the reinforcing sheet is cut according to the size specified in GB/T3362-2017, and the carbon fiber multifilament is obtained. Tensile specimen.

Zhongfu Shenying T700-24k grade carbon fiber was tested using the above carbon fiber multifilament tensile sample preparation method, and the results are shown in Table 1:

Table 1

In summary, using the method in this application to prepare carbon fiber multifilament tensile samples has the following advantages. First, the tension of carbon fiber yarns can be effectively controlled, so that the tension of each sample is uniform and the size is controllable; Second, it can make the sample straight and uniform in width, avoiding the twisting and deformation of the sample; third, the tension of the sample can be precisely controlled through the spring scale 5, which is convenient for studying the best multifilament drawing tension; 4. Compared with the conventional method, the tensile strength and dispersion of the sample are greatly improved; both the preparation tooling and the method in this application can significantly improve the quality of the carbon fiber multifilament tensile sample and the accuracy of the test data To reduce the discreteness of the test data.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be based on the scope defined in the claims.

Claims (10)

1. A frock for preparing a carbon fiber multifilament tensile sample is characterized in that it comprises: a support (1), a fixed rod (2), a limit rod (3), a pulley (4), a spring scale (5), frame (6) and fixing bolts (7), the frame (6) is installed on the support (1) through the fixing rod (2), the fixing rod (2) is provided with a C-shaped clip, the limit Rod (3) comprises first limit rod (31) and second limit rod (32), and pulley (4) is arranged on described limit rod (3), and described second limit rod (32) is provided with At the lower end of the frame (6), the upper part of the frame (6) is provided with a limiting groove (310), and the two ends of the first limiting rod (31) are inserted into the limiting groove (310), and the Positioning holes (8) are arranged on the frame (6) at the upper end of the limit groove (310), the fixing bolts (7) are installed in the positioning holes (8), and one end of the spring balance (5) is connected to the first The limit rod (31), the other end is connected with the fixing bolt (7). 2. The tool according to claim 1, characterized in that the C-shaped clip (21) comprises a first C-shaped clip (211) and a second C-shaped clip (212). 3. The tool according to claim 1, characterized in that, the limiting groove (310) comprises a first limiting groove (311) and a second limiting groove (312), and the first limiting groove ( 311) is set on the left side of the frame (6), the second limit groove (312) is set on the right side of the frame (6), the first limit groove (311) and the second limit groove The bit slots (312) are symmetrical and parallel. 4. The tool according to claim 3, characterized in that, the left end of the first limiting rod (31) is plugged into the first limiting groove (311), and the first limiting rod ( The right end of 31) is plugged into the second limiting groove (312), and the first limiting rod (31) can move in the limiting groove (310). 5. The tooling according to claim 1, characterized in that, the number of pulleys (4) provided on the first limit rod (31) and the second limit rod (32) is the same, and the first limit rod (31) and the pulley (4) on the second stop rod (32) correspond one to one in the vertical direction. 6. The tool according to claim 1, characterized in that, the positioning hole (8) comprises a first positioning hole (81) and a second positioning hole (82), and the first positioning hole (81) is arranged at On the left side of the frame (6), the second positioning hole (82) is arranged on the right side of the frame (6), the first positioning hole (81) and the second positioning hole (82) are symmetrical and parallel. 7. The tool according to claim 6, characterized in that, the fixing bolt (7) comprises a first fixing bolt (71) and a second fixing bolt (72), and the first fixing bolt (71) is installed on In the first positioning hole (81), the second fixing bolt (72) is installed in the second positioning hole (82). 8. The tool according to claim 7, characterized in that, the spring balance (5) comprises a first spring balance (51) and a second spring balance (52), and the upper end of the first spring balance (51) is connected to the first spring balance (51). A fixing bolt (71), the lower end is connected to one end of the first limiting rod (31), the upper end of the second spring scale (52) is connected to the second fixing bolt (72), and the lower end is connected to the first limiting rod. the other end of the bit rod (31). 9. A method for preparing a carbon fiber multifilament tensile sample based on tooling according to claim 1, characterized in that, comprising: S1. According to the requirements of the sample, select the pulleys (4) of the corresponding quantity and specifications, and install the corresponding pulleys (4) on the limit rod (3), and then install the limit rod (3) on the frame (6) ; S2, the frame (6) is placed vertically, and the distance between the first stop bar (31) and the second stop bar (32) is adjusted as required; S3, after the tooling is ready, wind one end of the carbon fiber yarn on the fixing bar (2) in the middle of the frame (6), and then fix it with the first C-shaped clip (211); S4, wrap the fixed carbon fiber yarn in the pulley (4) groove of the first stop bar (31) and the second stop bar (32) in sequence, and cut the carbon fiber yarn after winding; S5, wind the carbon fiber yarn cut in step S4 on the fixing bar (2), then fix with the second C-shaped clip (212); S6, using the mixed epoxy resin to infiltrate the carbon fiber yarn; S7. After the carbon fiber yarn is soaked by epoxy resin, use the first spring balance (51) to hook one end of the first limit rod (31), and use the second spring balance (52) to hook the second limit rod (32) The other end of the first spring balance (51) and the second spring balance (52) are stretched, so that the tension of the first spring balance (51) and the second spring balance (52) reaches a preset value; S8. Use the fixing bolt (7) to fix the spring scale (5) in the positioning hole (8) of the frame (6), and adjust the position of the fixing bolt (7) to make the tension of the spring balance (5) reach a preset value; S9. According to the standard GB/T 3362-2017, control the size of the sample test area and the size of the reinforcement sheet. The two ends of the sample are respectively bonded and clamped with reinforcement sheets, and then cured. After the sample is cured, follow the standard GB/T 3362 - In 2017, split the reinforcement sheet to obtain the carbon fiber multifilament tensile sample. 10. the preparation method that is used for carbon fiber multifilament tensile sample as claimed in claim 9, is characterized in that, the spacing D between the first stop bar (31) and the second stop bar (32) ≥350mm.

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