UHWPE fiber interface strength test sample preparation device and method

Abstract

The invention relates to a UHWPE fiber interface strength test sample preparation device and method, and the device comprises a substrate, and the same surface of the substrate is provided with two installation structures; each sample preparation mechanism comprises a first supporting plate and a second supporting plate which is parallel to the first supporting plate and is detachably fixed together with the first supporting plate, and the first supporting plate is provided with a plurality of first yarn penetrating holes penetrating through the thickness of the first supporting plate; the second supporting plate is provided with a plurality of second yarn penetrating holes which are in one-to-one correspondence with the first yarn penetrating holes and penetrate through the thickness of the second supporting plate, a plurality of grooves are formed in the face, opposite to the first supporting plate, of the second supporting plate, the first yarn penetrating holes and the second yarn penetrating holes are opposite to the grease injection space, and the two sample preparation mechanisms are connected with the two mounting structures in a one-to-one correspondence mode. According to the UHWPE fiber interface strength test sample preparation device, the problems that only one sample can be prepared once in the existing sample preparation process, and the discreteness of test data is relatively high and the test efficiency is low due to samples prepared for multiple times can be solved.

Description

Technical Field

[0001] The present invention relates to the field of interface strength testing between glass fiber and resin, and particularly to a device and method for preparing samples for testing the interface strength of UHWPE fibers. Background Art

[0002] UHWPE fiber, namely ultra-high molecular weight polyethylene fiber, has excellent properties such as high strength, impact resistance, and chemical corrosion resistance. Its fiber-reinforced composite materials are widely used in fields such as bulletproof protection, aerospace, and ocean engineering due to their excellent impact resistance, specific strength, and specific stiffness. The interface strength between UHMWPE fibers and the matrix resin is one of the key factors affecting the performance of composite materials. Currently, the testing methods include single fiber pull-out test, interlaminar shear strength test, etc. Among them, the single fiber pull-out test can directly measure the interface strength between the fiber and the matrix, and only one fiber is required for each test. However, the existing sample preparation device can only prepare one sample at a time. At least 3 samples are required for a single test. For samples prepared multiple times, the discreteness of the test data is relatively high, and the test efficiency is very low. Summary of the Invention

[0003] The present invention provides a device for preparing samples for testing the interface strength of UHWPE fibers, which can overcome the problems that the existing sample preparation can only prepare one sample at a time, and the samples prepared multiple times result in relatively high discreteness of test data and low test efficiency.

[0004] The device for preparing samples for testing the interface strength of UHWPE fibers according to the present invention includes:

[0005] A substrate, on the same surface of which there are two mounting structures. At two opposite ends of the substrate, there are a plurality of yarn routing grooves with the same quantity and corresponding to each other one by one. At these two ends of the substrate, there is respectively a yarn fixing structure, and the two yarn fixing structures are located on a diagonal line of the substrate;

[0006] Two sample preparation mechanisms, each of which includes a first support plate and a second support plate that is parallel to the first support plate and detachably fixed together. The first support plate has a plurality of first yarn-passing holes penetrating through the thickness of the first support plate; the second support plate has a plurality of second yarn-passing holes penetrating through the thickness of the second support plate. The first yarn-passing holes, the second yarn-passing holes correspond to the yarn routing grooves one by one and are located in the same vertical plane. On the surface of the second support plate opposite to the first support plate, there are a plurality of grooves. In the state where the second support plate is fixed to the first support plate, the grooves and the surface of the first support plate enclose a resin injection space with only the top opening. The first yarn-passing holes and the second yarn-passing holes are both opposite to the resin injection space. The two sample preparation mechanisms are connected to the two mounting structures correspondingly one by one. The same yarn passes through the two corresponding resin injection spaces of the two sample preparation mechanisms.

[0007] Preferably, the first support plate includes a vertical portion and a horizontal portion perpendicular to the vertical portion and connected to the bottom of the vertical portion. In the state where the first support plate is fixed to the second support plate, one vertical surface of the second support plate abuts tightly against one vertical surface of the vertical portion of the second support plate, and the bottom surface of the second support plate abuts tightly against the top surface of the horizontal portion of the first support plate.

[0008] Preferably, in the first sample preparation mechanism and the second sample preparation mechanism, the second support plate is closer to the end of the substrate than the first support plate.

[0009] Preferably, the first support plate is provided with an ejection hole, and the ejection hole is staggered from the bolt hole and the groove of the second support plate.

[0010] Preferably, both ends of the substrate are respectively provided with semi-cylindrical winding portions. The diameter of the winding portion is greater than the thickness of the substrate and protrudes from the upper surface and the lower surface of the substrate respectively. The yarn routing groove is located on the semi-circular arc surface of the winding portion.

[0011] The present invention also provides a method for preparing a UHWPE fiber interface strength test sample. Samples are prepared by the device as described above, including the following steps:

[0012] S1, Fix the first support plate and the second support plate together to form a sample preparation mechanism, and install the two sample preparation mechanisms on the two installation structures one by one;

[0013] S2, Pass the same yarn through all the first yarn passing holes, the second yarn passing holes and the resin injection space, and make the same yarn form multiple parallel segments on one side of the substrate where the two sample preparation mechanisms are installed. Each segment passes through the first sample preparation mechanism and the second sample preparation mechanism and is perpendicular to the first sample preparation mechanism and the second sample preparation mechanism;

[0014] S3, Inject resin into all the resin injection spaces;

[0015] S4, After the resin solidifies, take out the two sample preparation mechanisms from the substrate and remove the first support plate and the second support plate;

[0016] S5, Cut the yarn between adjacent two pieces of resin to form multiple samples.

[0017] The present invention also provides another method for preparing a UHWPE fiber interface strength test sample. Samples are prepared by the device as described above, including the following steps:

[0018] S1, Fix the first support plate and the second support plate together to form a sample preparation mechanism, and install the two sample preparation mechanisms on the two installation structures one by one;

[0019] S2. Pass the same yarn through all the first yarn passing holes, the second yarn passing holes and the resin injection spaces, and form multiple mutually parallel segments of the same yarn on one side of the substrate's sample preparation mechanism. Each segment passes through the first sample preparation mechanism and the second sample preparation mechanism and is perpendicular to the first sample preparation mechanism and the second sample preparation mechanism. The two ends of the yarn are fixedly connected to two yarn fixing structures respectively;

[0020] S3. Inject resin into all the resin injection spaces;

[0021] S4. After the resin solidifies, remove the two sample preparation mechanisms from the substrate and remove the first support plate and the second support plate;

[0022] S5. Cut the yarn between adjacent pieces of resin to form multiple samples.

[0023] The present invention also provides another method for preparing a UHWPE fiber interface strength test sample. The sample is prepared by the device as described above, including the following steps:

[0024] S1. Fix the first support plate and the second support plate together to form a sample preparation mechanism, and install the two sample preparation mechanisms on two installation structures respectively;

[0025] S2. Include: a. Pass the same yarn through the corresponding first yarn passing holes, the second yarn passing holes and the resin injection spaces, and make the yarn extend along the yarn routing grooves corresponding to both ends of the substrate to the other side of the substrate, make the yarn reach the yarn routing groove corresponding to the adjacent yarn routing groove obliquely, and extend along this yarn routing groove to the side of the substrate where the sample preparation mechanism is provided; b. Repeat a until the yarn passes through all the first yarn passing holes, the second yarn passing holes and the resin injection spaces, and form multiple mutually parallel segments of the same yarn on one side of the substrate's sample preparation mechanism;

[0026] S3. Inject resin into all the resin injection spaces;

[0027] S4. After the resin solidifies, remove the two sample preparation mechanisms from the substrate and remove the first support plate and the second support plate;

[0028] S5. Cut the yarn between adjacent pieces of resin to form multiple samples.

[0029] Compared with the prior art, the present invention has the following beneficial effects: By using the UHWPE fiber interface strength test sample preparation device and method of the present application, multiple samples can be made at one time under the same conditions by using one yarn, which can maximize the consistency of the samples, thereby reducing the discreteness of the sample test data. Description of the Drawings

[0030] Figure 1Schematic three-dimensional structure diagram of a device for preparing a sample for testing the interfacial strength of UHWPE fibers according to an embodiment of the present invention.

[0031] Figure 2 is Figure 1 Schematic cross-sectional structure diagram of the device for preparing a sample for testing the interfacial strength of UHWPE fibers in [[ ]] along line A-A.

[0032] Figure 3 is Figure 1 Schematic cross-sectional structure diagram of the device for preparing a sample for testing the interfacial strength of UHWPE fibers in [[ ]] along line B-B.

[0033] Figure 4 is Figure 1 Schematic top-view structure diagram of the device for preparing a sample for testing the interfacial strength of UHWPE fibers in [[ ]] when preparing a sample.

[0034] Figure 5 Schematic structure diagram of one of the samples prepared by the device for preparing a sample for testing the interfacial strength of UHWPE fibers according to an embodiment of the present invention.

[0035] Reference numerals

[0036] 1 Substrate, 11 Mounting groove, 12 Wire-winding part, 121 Yarn routing groove, 122 Yarn fixing structure;

[0037] 2 First sample preparation mechanism, 21 First support plate, 211 First yarn-passing hole, 212 First bolt hole, 213 Vertical part, 214 Horizontal part, 215 Ejection hole, 22 Second support plate, 221 Second yarn-passing hole, 222 Groove, 223 Second bolt hole;

[0038] 3 Second sample preparation mechanism, 31 First support plate, 32 Second support plate;

[0039] 4 Resin;

[0040] 5 Yarn. Detailed implementation manners

[0041] The present invention provides a device for preparing a sample for testing the interfacial strength of UHWPE fibers, as shown in [[ ]] Figure 1As shown, the device for preparing UHWPE fiber interface strength test samples includes: a substrate 1, a first sample preparation mechanism 2, and a second sample preparation mechanism 3. Two mounting structures are provided on the same surface of the substrate 1. A plurality of yarn routing grooves 121 with the same quantity and corresponding to each other are provided at two opposite ends of the substrate 1. One yarn fixing structure 122 is provided at each of the two ends of the substrate 1, and the two yarn fixing structures 122 are located on a diagonal line of the substrate 1 for fixing the two ends of the same yarn. In this embodiment, the yarn fixing structure 122 is a winding shaft fixed to the substrate 1, and the end of the yarn 5 can be wound around the winding shaft and fixed. The structures of the first sample preparation mechanism 2 and the second sample preparation mechanism 2 are the same, and both include a first support plate 21, 31 and a second support plate 22, 32 that is parallel to and detachably fixed to the first support plate 21, 31. The first support plate 21, 31 has a plurality of first yarn passing holes 211 penetrating through the thickness of the first support plate 21, 31; the second support plate 22, 32 has a plurality of second yarn passing holes 221 corresponding to the first yarn passing holes 211 one by one and penetrating through the thickness of the second support plate 22, 32. The first yarn passing holes 211, the second yarn passing holes 221 and the yarn routing grooves 121 correspond to each other one by one and are located in the same vertical plane, so that the part of the yarn 5 combined with the resin 4 can be kept perpendicular to the resin 4. A plurality of grooves 222 are provided on the surface of the second support plate 22, 32 opposite to the first support plate 21, 31. In the state where the second support plate 22, 32 is fixed to the first support plate 21, 31, the grooves 222 and the surface of the first support plate 21, 31 enclose a resin injection space with only the top opening. The first yarn passing holes 211 and the second yarn passing holes 221 both correspond to the resin injection space. The two sample preparation mechanisms are connected to the two mounting structures correspondingly one by one, and the same yarn 5 passes through all the resin injection spaces of the two sample preparation mechanisms.

[0042] When preparing samples, one end of the yarn 5 is passed through two corresponding yarn passing holes 211, 221 of the first sample preparation mechanism 2, then through two corresponding yarn passing holes 211, 221 and the resin injection space of the second sample preparation mechanism, the yarn 5 is reversely wound around the other side of the substrate, and then reversely, through two other corresponding yarn passing holes 211, 221 and the resin injection space of the first sample preparation mechanism and two other corresponding yarn passing holes 211, 221 and the resin injection space of the second sample preparation mechanism, and so on in sequence, so that the same yarn 5 passes through all the resin injection spaces in sequence. Resin 4 is injected into all the resin injection spaces. After the resin solidifies, the two sample preparation mechanisms are taken out from the substrate 1, the first support plate 21, 31 and the second support plate 22, 32 are removed, and the yarn 5 is cut between adjacent pieces of resin 4. Multiple samples can be formed using one yarn, and each sample is as Figure 5 shown, and all the samples are made at one time under the same conditions, which can maximize the consistency of the samples, thereby reducing the discreteness of the sample test data.

[0043] In this embodiment, as shown in the figure, the second support plates 22 and 32 are provided with 8 grooves 222 extending vertically. After the second support plates 22 and 32 are combined with the first support plates 21 and 31, 8 grease injection spaces are formed, and the two sample preparation mechanisms can form 16 grease injection spaces.

[0044] As Figure 1 and Figure 2 shown, the two mounting structures are parallel mounting grooves 11. The lower end of the first sample preparation mechanism 2 extends into the first mounting groove 11, and the lower end of the second sample preparation mechanism extends into the second mounting groove 11. The widths of the two mounting grooves 11 are the same, and the widths of the two sample preparation mechanisms are also the same. The width of the mounting groove 11 is slightly larger than the width of the sample preparation mechanism. The depth of the mounting groove 11 is 1 / 3 - 1 / 2 of the overall height of the sample preparation mechanism, which enables the sample preparation mechanism to be stably held in the mounting groove 11, and at the same time facilitates the installation of the sample preparation mechanism in the mounting groove 11 and its removal from the mounting groove 11.

[0045] As Figure 1 shown, both ends of the substrate 1 are respectively provided with semi-cylindrical wire winding parts 12. The diameter of the wire winding part 12 is greater than the thickness of the substrate 1 and protrudes from the upper surface and the lower surface of the substrate 1 respectively. In this embodiment, the yarn routing groove 121 is located on the semi-circular arc surface of the wire winding part 12 and is semi-circular. The yarn 5 is wound around the semi-circular arc surface of the wire winding part 12, and its deformation is alleviated and it will not be cut by sharp edges. The yarn fixing structure 122 is also located on the wire winding part 12.

[0046] The first support plates 21 and 31 are provided with first bolt holes 212, and the second support plates 22 and 32 are both provided with second bolt holes 223. The first support plates 21 and 31 and the second support plates 22 and 32 are detachably connected by bolts passing through the bolt holes, and the bolt holes are distributed on both sides of each grease injection space.

[0047] The cross-section of the first support plates 21 and 31 is L-shaped, that is, it includes a vertical part 213 and a horizontal part 214 that is perpendicular to the vertical part 213 and connected to the bottom line of the vertical part 213. In the state where the first support plates 21 and 31 are fixed to the second support plates 22 and 32, a vertical surface of the second support plates 22 and 32 abuts tightly against a vertical surface of the vertical part 213 of the second support plates 22 and 32, and the bottom surface of the second support plates 22 and 32 abuts tightly against the top surface of the horizontal part 214 of the first support plates 21 and 31. The cross-section of the sample preparation mechanism is rectangular and is adapted to the cross-sectional shape of the mounting groove 11. In the first sample preparation mechanism 2 and the second sample preparation mechanism, the second support plates 22 and 32 are closer to the end of the substrate 1 than the first support plates 21 and 31.

[0048] The first support plates 21, 31 are further provided with ejection holes 215, and the ejection holes 215 are staggered from the bolt holes and the grooves 222 of the second support plates 22, 32. When the resin 4 solidifies, it will adhere to the first support plates 21, 31 and the second support plates 22, 32. After the ejection screws pass through the ejection holes 215, they will abut against the second support plates 22, 32, separating the second support plates 22, 32 from the resin 4. Then, it will be easier to separate the first support plates 21, 31 and the resin 4.

[0049] The present invention also provides a method for preparing a UHWPE fiber interfacial strength test sample. Samples are prepared by using the device described above, including the following steps:

[0050] S1, Fix the first support plates 21, 31 and the second support plates 22, 32 together to form sample preparation mechanisms 2, 3, and install the two sample preparation mechanisms 2, 3 on the two installation structures in a one-to-one correspondence;

[0051] S2, Pass the same yarn through all the first yarn passing holes 211, the second yarn passing holes 221 and the resin injection spaces, and make the same yarn form a plurality of parallel segments on the side of the substrate 1 where the two sample preparation mechanisms 2, 3 are installed. Each segment passes through the first sample preparation mechanism 2 and the second sample preparation mechanism 3 and is perpendicular to the first sample preparation mechanism 2 and the second sample preparation mechanism 3;

[0052] S3, Inject resin 4 into all the resin injection spaces;

[0053] S4, After the resin 4 solidifies, take out the two sample preparation mechanisms 2, 3 from the substrate 1, and remove the first support plates 21, 31 and the second support plates 22, 32;

[0054] S5, Cut the yarn between adjacent pieces of resin 4 to form a plurality of samples.

[0055] The present invention also provides another method for preparing a UHWPE fiber interfacial strength test sample. Samples are prepared by using the device described above, including the following steps:

[0056] S1, Fix the first support plates 21, 31 and the second support plates 22, 32 together to form sample preparation mechanisms 2, 3, and install the two sample preparation mechanisms 2, 3 on the two installation structures in a one-to-one correspondence;

[0057] S2, Pass the same yarn through all the first yarn passing holes 211, the second yarn passing holes 221 and the resin injection spaces, and make the same yarn form a plurality of mutually parallel segments on the side of the substrate 1 where the two sample preparation mechanisms 2, 3 are installed. Each segment passes through the first sample preparation mechanism 2 and the second sample preparation mechanism 3 and is perpendicular to the first sample preparation mechanism 2 and the second sample preparation mechanism 3. The two ends of the yarn are fixed to the two yarn fixing structures 122 in a one-to-one correspondence;

[0058] S3. Inject resin 4 into all the resin injection spaces;

[0059] S4. After the resin 4 solidifies, remove the two sample preparation mechanisms 2 and 3 from the substrate 1, and remove the first support plates 21 and 31 and the second support plates 22 and 32;

[0060] S5. Cut the yarn between adjacent pieces of resin 4 to form multiple samples.

[0061] The present invention also provides a method for preparing a UHWPE fiber interface strength test sample. Samples are prepared by the device as described above, including the following steps:

[0062] S1. Fix the first support plates 21 and 31 and the second support plates 22 and 32 together to form the sample preparation mechanisms 2 and 3, and install the two sample preparation mechanisms 2 and 3 on the two installation structures one by one;

[0063] S2. Include: a. Pass the same yarn through the corresponding first yarn passing holes 211, second yarn passing holes 221 and resin injection spaces of the first sample preparation mechanism 2 and the second sample preparation mechanism 3, and extend the yarn along the corresponding yarn running grooves 121 at both ends of the substrate 1 to the other side of the substrate 1, so that the yarn reaches the yarn running groove 121 corresponding to the adjacent yarn running groove 121 obliquely, and extend along this yarn running groove 121 to the side of the substrate 1 where the sample preparation mechanisms 2 and 3 are installed; b. Repeat a until the yarn passes through all the first yarn passing holes 211, second yarn passing holes 221 and resin injection spaces, so that the same yarn forms multiple mutually parallel segments on the side of the substrate 1 where the two sample preparation mechanisms 2 and 3 are installed;

[0064] S3. Inject resin 4 into all the resin injection spaces;

[0065] S4. After the resin 4 solidifies, remove the two sample preparation mechanisms 2 and 3 from the substrate 1, and remove the first support plates 21 and 31 and the second support plates 22 and 32;

[0066] S5. Cut the yarn between adjacent pieces of resin 4 to form multiple samples.

[0067] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art make various modifications or equivalent replacements within the essence and protection scope of the present invention, which also fall within the protection scope of the present invention.

Claims

1. A device for preparing a sample for testing the interfacial strength of UHWPE fibers, characterized in that, Including: A substrate, on the same surface of the substrate are provided with two mounting structures, at two opposite ends of the substrate are provided with the same number of and a plurality of yarn routing grooves corresponding one by one, at the two ends of the substrate are respectively provided with a yarn fixing structure, and the two yarn fixing structures are located on a diagonal line of the substrate; Two sample preparation mechanisms, each sample preparation mechanism includes a first support plate and a second support plate which is parallel to the first support plate and detachably fixed together, the first support plate has a plurality of first yarn passing holes penetrating through the thickness of the first support plate; the second support plate has a plurality of second yarn passing holes penetrating through the thickness of the second support plate, the first yarn passing holes, the second yarn passing holes and the yarn routing grooves correspond one by one and are located in the same vertical plane, on the surface of the second support plate opposite to the first support plate are provided with a plurality of grooves, in the state where the second support plate is fixed to the first support plate, the grooves and the surface of the first support plate enclose a resin injection space with only the top end open, the first yarn passing holes and the second yarn passing holes are both opposite to the resin injection space, the two sample preparation mechanisms are connected to the two mounting structures correspondingly one by one, and the same yarn passes through the two corresponding resin injection spaces of the two sample preparation mechanisms.

2. The preparation device according to claim 1, characterized in that, The two mounting structures are parallel mounting grooves, and the lower ends of the sample preparation mechanisms extend into the mounting grooves.

3. The preparation device according to claim 1, characterized in that, Both the first support plate and the second support plate include bolt holes, and the first support plate and the second support plate are detachably connected by bolts passing through the bolt holes.

4. The preparation device according to claim 1, characterized in that, The first support plate includes a vertical portion and a horizontal portion perpendicular to the vertical portion and connected to the bottom of the vertical portion, in the state where the first support plate is fixed to the second support plate, a vertical surface of the second support plate abuts tightly against a vertical surface of the vertical portion of the second support plate, and the bottom surface of the second support plate abuts tightly against the top surface of the horizontal portion of the first support plate.

5. The preparation device according to claim 4, characterized in that, In the first sample preparation mechanism and the second sample preparation mechanism, the second support plate is closer to the end of the substrate than the first support plate.

6. The preparation device according to claim 1, wherein The first support plate is provided with ejection holes, and the ejection holes are staggered from the bolt holes and the grooves of the second support plate.

7. The preparation device according to claim 1, characterized in that At both ends of the substrate are respectively provided with semi-cylindrical winding portions, the diameter of the winding portions is greater than the thickness of the substrate, and the winding portions protrude from the upper surface and the lower surface of the substrate respectively, and the yarn routing grooves are located on the semi-circular arc surfaces of the winding portions.

8. A method for preparing a test sample for the interfacial strength of UHWPE fibers, characterized in that, Preparing a sample by the device according to any one of claims 1-9, including the following steps: S1, fixing the first support plate and the second support plate together to form a sample preparation mechanism, and installing the two sample preparation mechanisms on the two mounting structures correspondingly one by one; S2, passing the same yarn through all the first yarn passing holes, the second yarn passing holes and the resin injection spaces, and making the same yarn form a plurality of parallel segments on one side of the substrate where the sample preparation mechanisms are installed, and each segment passes through the first sample preparation mechanism and the second sample preparation mechanism and is perpendicular to the first sample preparation mechanism and the second sample preparation mechanism; S3, injecting resin into all the resin injection spaces; S4, after the resin solidifies, taking out the two sample preparation mechanisms from the substrate and removing the first support plate and the second support plate; S5, cutting the yarn between adjacent two pieces of resin to form a plurality of samples.

9. A method for preparing a UHWPE fiber interface strength test sample, characterized in that, Preparing a sample by the device as described in claim 9, comprising the following steps: S1, fixing the first support plate and the second support plate together to form a sample preparation mechanism, and correspondingly mounting the two sample preparation mechanisms on two mounting structures; S2, passing the same yarn through all the first yarn passing holes, the second yarn passing holes and the resin injection spaces, and forming a plurality of mutually parallel segments of the same yarn on one side of the substrate where the sample preparation mechanism is mounted. Each said segment passes through the first sample preparation mechanism and the second sample preparation mechanism and is perpendicular to the first sample preparation mechanism and the second sample preparation mechanism, and the two ends of the yarn are correspondingly fixed on two yarn fixing structures; S3, injecting resin into all the resin injection spaces; S4, after the resin solidifies, taking out the two sample preparation mechanisms from the substrate and removing the first support plate and the second support plate; S5, cutting the yarn between adjacent two pieces of resin to form a plurality of samples.

10. A method for preparing a sample for testing the interfacial strength of UHWPE fibers, characterized in that, Preparing a sample by the device as described in claim 8, comprising the following steps: S1, fixing the first support plate and the second support plate together to form a sample preparation mechanism, and correspondingly mounting the two sample preparation mechanisms on two mounting structures; S2, including: a, passing the same yarn through the corresponding first yarn passing hole, the second yarn passing hole and the resin injection space, and making the yarn extend to the other side of the substrate along the yarn routing groove, making the yarn reach the yarn routing groove corresponding to the adjacent yarn routing groove obliquely, and extending along this yarn routing groove to the side of the substrate where the sample preparation mechanism is provided; b, repeating a until the yarn passes through all the first yarn passing holes, the second yarn passing holes and the resin injection spaces, and forming a plurality of mutually parallel segments of the same yarn on one side of the substrate where the sample preparation mechanism is mounted; S3, injecting resin into all the resin injection spaces; S4, after the resin solidifies, taking out the two sample preparation mechanisms from the substrate and removing the first support plate and the second support plate; S5, cutting the yarn between adjacent two pieces of resin to form a plurality of samples.

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