Fast-assembly fiber wide-temperature high-precision stretching auxiliary device and use method
By designing a fast-install fiber wide temperature high-precision tensile auxiliary device, the combination of fastener and limiting blocks solves the accuracy and reliability problems of the traditional clamping method, and realizes high-precision mechanical performance testing under different temperature conditions, reducing costs and avoiding stress concentration.
Patent Information
- Application Number
- CN202510170894.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2025-07-04
AI Technical Summary
Traditional clamping and fixing methods fail to provide sufficient accuracy and reliability for mechanical properties testing of fiber bundles and monofilament fibers, resulting in inaccurate test data and the use of adhesives that cannot be tested under stress concentration and high temperature conditions.
Using a fast-install fiber wide temperature high-precision tensile auxiliary device, the combination design of the first and second fastening blocks and limit blocks is achieved to achieve double tightening, avoid the use of adhesive, and ensure coaxiality of the specimen and the instrument and test accuracy.
It improves the accuracy and reliability of mechanical properties testing of fiber bundles and monofilament fibers, reduces costs, and is suitable for testing under different temperature conditions, avoiding the influence of stress concentration and adhesives.
Smart Images
Figure CN120253432A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of auxiliary detection of fiber products, and particularly to a quick-assembly fiber wide-temperature high-precision stretching auxiliary device and a using method thereof. Background Art
[0002] At present, fiber products are widely used in various industrial fields. Fiber products generally bear the influence of the surrounding environment during work. Under the influence of the environment, the mechanical properties under quasi-static conditions are different from the dynamic mechanical properties under high strain, and it is a continuous changing process. Therefore, accurately obtaining the changes in the mechanical properties of fiber bundles and single fiber filaments under different environments is a key point to ensure their application safety.
[0003] In the mechanical property tests of fiber bundles and single fiber filaments, especially under quasi-static conditions, the clamping method and fixing technology during the experiment are crucial. Due to the brittle characteristics of the fiber itself and the possible deformation problems during fixing and stretching, traditional clamping and fixing methods often cannot provide sufficient accuracy and reliability.
[0004] In the tensile experiment of fiber bundles or single fiber filaments, traditional clamping methods usually rely on metal clamps and adhesive auxiliary plates. Due to the strong rigidity of metal clamps, they may cause damage to the fiber during the clamping process, especially for high-strength and brittle fiber materials, and it is difficult to achieve the fixing effect of the clamp. This fixing method often leads to the following problems: misalignment between the fiber bundle and the clamp. When the fiber bundle or single fiber fails to be accurately aligned with the chuck of the testing machine, the axis of the fiber and the clamp is inconsistent during the stretching process, which may cause an offset moment and affect the accuracy of the test data; fiber bending or twisting often occurs during clamping, especially for high-strength fibers, and their brittleness makes the fiber prone to breakage during the clamping process; due to the application of the adhesive, stress concentration often occurs in the bonding area. Especially during the stretching process of the fiber, the bonding joint will bear a large tensile stress, which is easy to cause the fiber to break, and the adhesive requires a certain time to fully cure, which means a long experimental preparation time and cannot achieve the immediate use effect, resulting in a time delay; before the adhesive cures, its fluidity is strong, and it is impossible to ensure the precise fixing of the fiber. Once the adhesive cures and an experiment is carried out, the auxiliary plate and the adhesive usually cannot be reused; the adhesive will soften or fall off under high-temperature conditions, and it is impossible to conduct mechanical property tests on the specimen at high temperature; finally, an extensometer cannot be used on the auxiliary plate. The auxiliary plate is too thin to hold the extensometer, resulting in a reduction in test accuracy. Summary of the Invention
[0005] To solve the problem that the mechanical property tests of fiber bundles and single-filament fibers using traditional clamping and fixing methods in the above-mentioned existing technologies cannot provide sufficient accuracy and reliability, the present invention proposes a fast-installable fiber wide-temperature high-precision tensile auxiliary device and a usage method. Without using adhesives, it can reduce the test cost while increasing the number of uses and can be reused. At the same time, the present invention can control the position of the fiber test section to ensure the coaxiality of the test section and the instrument, avoid possible stress concentration, and further ensure the accuracy of the test.
[0006] The present invention is realized through the following technical solutions: It includes a first fastening block, a second fastening block detachably connected to the first fastening block, a third fastening block having the same structure as the first fastening block and symmetrically arranged, a fourth fastening block having the same structure as the second fastening block and symmetrically arranged, a first limiting block arranged between the first fastening block and the third fastening block, and a second limiting block arranged between the second fastening block and the fourth fastening block. The first limiting block and the second limiting block have the same structure; the first fastening block is generally rectangular parallelepiped-shaped, including a first groove opened at the center of any surface of the first fastening block and parallel to this plane, a connecting plate arranged on the same surface as the first groove, a second protrusion arranged on the surface perpendicular to the surface where the first groove is located, and a first cylinder arranged on the surface far from the second protrusion; a groove is opened at one end of the first cylinder close to the first groove, and a limiting hole is opened at the center of the first cylinder parallel to the first groove; an annular groove is opened on the surface of the first cylinder parallel to the first groove, and the annular groove is perpendicular to the first groove; a first protrusion is arranged on the surface of the second fastening block that is spliced with the first fastening block, and the first protrusion is matched with the first groove on the first fastening block for splicing. A first through hole is penetrated through the corresponding position of the second fastening block, and the first through hole is perpendicular to the first protrusion and is connected to the connecting plate on the first fastening block; the second fastening block further includes a third protrusion, and the third protrusion is arranged on the surface perpendicular to the first protrusion. A second cylinder is arranged on the surface of the second fastening block far from the third protrusion, and the shape of the second cylinder is the same as the shape of the groove opened on the first cylinder of the first fastening block; the first cylinder and the second cylinder form a complete cylinder after splicing. An annular groove is opened at the corresponding position on the circumferential surface of the second cylinder, and a limiting hole is opened at the corresponding position of the second cylinder parallel to the first protrusion; the first limiting block is generally strip-shaped, and grooves having the same shape as the second protrusion are arranged at both ends in the length direction of the first limiting block, and grooves having the same shape as the third protrusion are arranged at both ends in the length direction of the second limiting block; the tensile auxiliary device further includes a first fastening sleeve sleeved on the first cylinder of the spliced first fastening block and the second cylinder of the second fastening block, and a second fastening sleeve sleeved on the first cylinder of the spliced third fastening block and the second cylinder of the fourth fastening block.
[0007] Further, the stretching auxiliary device further includes a first pin block. The length of the connecting plate is greater than the depth of the first through hole. A through hole is provided at a position of the connecting plate away from the first groove, and this through hole is perpendicular to both the first groove and the connecting plate at the same time. The first pin block passes through the through hole on the connecting plate to fix the first fastening block and the second fastening block together.
[0008] Further, the cylinder formed by splicing the first cylinder and the second cylinder is a cylinder, and its axis is parallel to the first groove; annular grooves are provided on the circumferential surfaces of the first cylinder and the second cylinder.
[0009] Further, the first groove is arc-shaped; the second protrusion and the third protrusion are semi-cylindrical.
[0010] Further, a groove is provided on one side of the first cylinder away from the second protrusion. This groove passes through the limiting hole at the center of the first cylinder and extends along the surface of the first cylinder to the annular groove on the circumferential surface of the first cylinder.
[0011] Further, a groove is also provided on the surface of the second cylinder away from the third protrusion, and it extends along the surface of the second cylinder to the annular groove on the circumferential surface of the second cylinder.
[0012] Further, the number of both the connecting plate and the first through hole is four, and they are symmetrically arranged with respect to the first groove and the first protrusion respectively; the first fastening block and the second fastening block are fixedly connected by the first pin block and the second pin block, and the third fastening block and the fourth fastening block are fixedly connected by the third pin block and the fourth pin block; the structures of the second pin block, the third pin block and the fourth pin block are the same as that of the first pin block.
[0013] Further, a spring is arranged on the connecting plate at one end away from the first groove along the direction of the first through hole. One end of the spring contacts the first pin block, and the other end is fixedly connected with a limiting plate, and the limiting plate is fixedly connected with the connecting plate.
[0014] Further, a number of fourth protrusions are arranged on the inner walls of the first fastening sleeve and the second fastening sleeve along the circumferential direction.
[0015] The present invention also provides a usage method applicable to the quick-installable fiber wide-temperature high-precision stretching auxiliary device of the present invention, including the following steps:
[0016] Step 1: Place the first fastening block and the third fastening block symmetrically, with the second protrusions facing each other, and install the first limiting block on the first fastening block and the third fastening block;
[0017] Step 2: Place the fiber bundle into the first groove and snap the fiber bundle into the limiting hole at the center of the first cylinder;
[0018] Step 3: Place the second fastening block and the fourth fastening block symmetrically with the third protrusions facing each other, and install the second limiting block on the second fastening block and the fourth fastening block;
[0019] Step 4: Splice the second fastening block, the fourth fastening block, and the second limiting block installed in Step 3 together with the first fastening block, the third fastening block, and the first limiting block after the fiber bundle is inserted in Step 2, and fixedly connect them through the first pin block;
[0020] Step 5: Wind the fiber bundle around the circumferential grooves on the circumferential surfaces of the first cylinder and the second cylinder respectively through the annular grooves on the circumferential surfaces of the first cylinder and the second cylinder, and fasten it with the first fastening sleeve and the second fastening sleeve;
[0021] Step 6: Clamp the assembled tensile auxiliary device on the tensile testing machine, remove the first limiting block and the second limiting block, and then start the tensile test;
[0022] Step 7: After the tensile test is completed, remove the tensile auxiliary device, remove the first pin block, the first fastening sleeve, and the second fastening sleeve, and replace the fiber bundle for testing.
[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0024] 1. The present invention can realize quasi-static mechanical tensile tests on fiber monofilaments, fiber bundle specimens, or plastic rope specimens at different temperature conditions on an electronic universal testing machine.
[0025] 2. The present invention solves the fastening problem of fiber monofilaments or fiber bundle specimens (such as plastic rope specimens), prevents the specimens from slipping and the problem of stress concentration at the bonding end during the stretching process; the present invention has a two-fold fastening effect, the meshing of the fastening blocks is the first-fold clamping and fastening; the mutual meshing of the fastening grooves and the fastening block 11 realizes the second-fold clamping and fastening.
[0026] 3. The present invention no longer uses adhesives to fix the specimens, reduces the influence of adhesives on the specimens, and avoids the situation that adhesives will absorb stress waves during the test or cause stress concentration on the fibers at the bonding edge, resulting in inaccurate tests, making the experimental accuracy higher and ensuring the reliability of the experimental results.
[0027] 4. The present invention does not use adhesives, solves the problem of disposable use of the fixture, and reduces the fixture use cost.
[0028] 5. After the present invention clamps and fastens the fiber bundle specimen, the experiment can be carried out immediately, improving the efficiency of fiber monofilament or fiber bundle experiments.
[0029] 6. After the specimens are clamped twice by the present invention, the specimens are directly clamped, ensuring the effective test length of the specimens.
[0030] 7. The present invention can ensure the coaxiality with the instrument during the clamping process of the auxiliary plate.
[0031] 8. The present invention can use an extensometer to clamp the device to ensure the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 is a schematic diagram of the overall structure of the stretching auxiliary device of the present invention.
[0033] Figure 2 is a schematic diagram of the cooperation and assembly of a single fiber or fiber bundle and the stretching auxiliary device of the present invention.
[0034] Figure 3 is a partially enlarged view of the structure of the first fastening block or the third fastening block of the present invention.
[0035] Figure 4 is a partially enlarged view of the structure of the second fastening block or the fourth fastening block of the present invention.
[0036] Figure 5 is a partially enlarged view of the structure of the first limiting block or the second limiting block of the present invention.
[0037] Figure 6 is a partially enlarged view of the structure of the first, second, third or fourth pin blocks of the present invention.
[0038] Figure 7 is a partially enlarged view of the structure of the first fastening sleeve or the second fastening sleeve of the present invention.
[0039] Reference numerals in the figures:
[0040] 1. First fastening block; 2. Second fastening block; 3. Third fastening block; 4. Fourth fastening block; 5. First limiting block; 6. Second limiting block; 7. First pin block; 8. Second pin block; 9. Third pin block; 10. Fourth pin block; 11. First fastening sleeve; 12. Second fastening sleeve; 1001. First cylinder; 1002. First groove; 1003. Connecting plate; 1004. Second protrusion; 1005. Limiting plate; 2001. Second cylinder; 2002. First protrusion; 2003. First through hole; 2004. Third protrusion; 1101. Fourth protrusion. DETAILED DESCRIPTION OF THE INVENTION
[0041] The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the drawings.
[0042] Such as Figures 1 to 7As shown in the figure, the present invention provides a quick-assembly fiber wide-temperature high-precision stretching auxiliary device, including a first fastening block 1, a second fastening block 2, a third fastening block 3, a fourth fastening block 4, a first limiting block 5 and a second limiting block 6. The first fastening block 1 and the third fastening block 3 have the same structure, the second fastening block 2 and the fourth fastening block 4 have the same structure, and the first limiting block 5 and the second limiting block 6 have the same structure. The first fastening block 1 and the second fastening block 2 are detachably connected, the third fastening block 3 and the fourth fastening block 4 are detachably connected, the first fastening block 1 and the third fastening block 3 are symmetrically arranged, a first limiting block 5 is arranged between the first fastening block 1 and the third fastening block 3, and a second limiting block 6 is arranged between the second fastening block 2 and the fourth fastening block 4. The splicing contact part between the first fastening block 1 and the second fastening block 2 clamps a fiber monofilament or a fiber bundle, and the splicing contact part between the third fastening block 3 and the fourth fastening block 4 also clamps a fiber monofilament or a fiber bundle.
[0043] As Figure 2 shown, the first fastening block 1 is generally rectangular in shape and includes a first cylinder 1001, a first groove 1002, a connecting plate 1003 and a second protrusion 1004. The first groove 1002 is opened at the center of any surface of the first fastening block 1 and is parallel to this plane, and is used for splicing with the second fastening block 2 and clamping a fiber monofilament or a fiber bundle. The first groove 1002 is preferably arc-shaped, so as to avoid damage to the fiber bundle by sharp angles. The connecting plate 1003 is arranged on the same surface as the first groove 1002 and is used for connecting the second fastening block 2. The second protrusion 1004 is arranged on the surface perpendicular to the surface where the first groove 1002 is located and is used for connecting the first limiting block 5. The second protrusion 1004 is preferably semi-cylindrical for easy adjustment. The first cylinder 1001 is arranged on the surface far from the second protrusion 1004. A groove is opened at one end of the first cylinder 1001 close to the first groove 1002, and a limiting hole for the fiber bundle to pass through is opened in the first cylinder 1001 parallel to the center of the first groove 1002. The first cylinder 1001 is preferably cylindrical, and the axis of the first cylinder 1001 is parallel to the first groove 1002. An annular groove is opened on the circumferential surface of the first cylinder 1001. In order to avoid damage to the fiber bundle by foreign objects at the first cylinder 1001, a groove can be opened on the surface of the first cylinder 1001 far from the second protrusion 1004. This groove passes through the limiting hole at the center of the first cylinder 1001 and extends along the surface of the first cylinder 1001 to the annular groove on the circumferential surface of the first cylinder 1001.
[0044] As Figure 4As shown in the figure, on the side of the second fastening block 2 that is spliced with the first fastening block 1, a first protrusion 2002 is provided. The first protrusion 2002 is matched with the first groove 1002 on the first fastening block 1 for splicing, and is used to clamp the fiber bundle or single fiber filament. A first through hole 2003 is provided through the second fastening block 2 at a corresponding position. The first through hole 2003 is perpendicular to the first protrusion 2002 and is used to connect with the connecting plate 1003 on the first fastening block 1. The second fastening block 2 further includes a third protrusion 2004. The third protrusion 2004 is provided on a surface perpendicular to the first protrusion 2002 and is used to connect with the second limiting block 6. Similar to the second protrusion 1004, the third protrusion 2004 is preferably semi-cylindrical for easy adjustment. On the side of the second fastening block 2 away from the third protrusion 2004, a second cylinder 2001 is provided. The shape of the second cylinder 2001 is the same as the shape of the groove formed on the first cylinder 1001 of the first fastening block 1. After the first cylinder 1001 and the second cylinder 2001 are spliced, a complete cylinder is formed, preferably a cylinder. Correspondingly, an annular groove is provided at a corresponding position on the circumferential surface of the second cylinder 2001, and a limiting hole is provided at a corresponding position on the second cylinder 2001 parallel to the first protrusion 2002 for passing through and limiting the fiber bundle. A groove is also provided on the surface of the second cylinder 2001 away from the third protrusion 2004 and extends along the surface of the second cylinder 2001 to the annular groove on the circumferential surface of the second cylinder 2001.
[0045] As Figure 5 shown, the first limiting block 5 is integrally strip-shaped. Grooves with the same shape as the second protrusion 1004 are provided at both ends of the first limiting block 5 in the length direction. Correspondingly, grooves with the same shape as the third protrusion 2004 are provided at both ends of the second limiting block 6 in the length direction.
[0046] As Figures 1 to 4 and Figure 6 shown, the stretching auxiliary device further includes a first pin block 7. The first pin block 7 is strip-shaped, with a part of its length direction being rough and a part of its thickness increasing from the center away from the rough part. The length of the connecting plate 1003 is greater than the depth of the first through hole 2003. A through hole is provided at a position on the connecting plate 1003 away from the first groove 1002, and this through hole is perpendicular to both the first groove 1002 and the connecting plate 1003. The first pin block 7 passes through the through hole on the connecting plate 1003 to fix the first fastening block 1 and the second fastening block 2 together.
[0047] As Figures 1 to 4 and Figure 7As shown, the stretching assisting device further includes a first fastening sleeve 11 and a second fastening sleeve 12, and the first fastening sleeve 11 and the second fastening sleeve 12 are in a ring shape. The first fastening sleeve 11 is sleeved on the first cylinder 1001 of the spliced first fastening block 1 and the second cylinder 2001 of the second fastening block 2 for secondary fastening of the wound fiber bundle. The second fastening sleeve 12 is sleeved on the first cylinder 1001 of the spliced third fastening block 3 and the second cylinder 2001 of the fourth fastening block 4 for secondary fastening of the wound fiber bundle.
[0048] The second protrusions 1004 on the first fastening block 1 and the second protrusions 1004 on the third fastening block 3 are arranged facing each other and are connected by a first limiting block 5. Similarly, the third protrusions 2004 on the second fastening block 2 and the third protrusions 2004 on the fourth fastening block 4 are arranged facing each other and are connected by a second limiting block 6. Through the meshing and cooperation of the first fastening block 1, the first limiting block 5, the third fastening block 3, the second fastening block 2, the second limiting block 6 and the fourth fastening block 4, the coaxiality of the fiber bundle and the tensile testing machine can be maintained when the stretching assisting device of the present invention is fixed to the tensile testing machine.
[0049] In some embodiments, the number of the connecting plates 1003 is four, and correspondingly, the number of the first through holes 2003 is also four, and they are symmetrically arranged relative to the first groove 1002 and the first protrusion 2002 respectively. The first fastening block 1 and the second fastening block 2 are fixedly connected by a first pin block 7 and a second pin block 8, and the third fastening block 3 and the fourth fastening block 4 are fixedly connected by a third pin block 9 and a fourth pin block 10. The structures of the second pin block 8, the third pin block 9 and the fourth pin block 10 are the same as that of the first pin block 7.
[0050] In some embodiments, a spring is arranged at one end of the connecting plate 1003 away from the first groove 1002 along the direction of the first through hole 2003. One end of the spring contacts the first pin block 7, and the other end is fixedly connected with a limiting plate 1005, and the limiting plate 1005 is fixedly connected with the connecting plate 1003. The spring is used to prevent the first pin block 7 from falling during transportation or experiments. When the first pin block 7 needs to be removed, the limiting plate 1005 is pulled out, so as to drive the spring to disengage from the first pin block 7 and make it fall, realizing the loading and unloading of the first pin block 7.
[0051] In some embodiments, a plurality of fourth protrusions 1101 are arranged on the inner walls of the first fastening sleeve 11 and the second fastening sleeve 12 along the circumferential direction. The fourth protrusions 1101 are used to cooperate with the annular grooves on the circumferential directions of the first cylinder 1001 and the second cylinder 2001, so as to enhance the fastening effect of the device on the fiber bundle. The number of the fourth protrusions 1101 is preferably four.
[0052] The present invention also provides a method of using the stretching assistance device described in the present invention, which includes the following steps:
[0053] Step 1: Place the first fastening block 1 and the third fastening block 3 symmetrically, with the second protrusion 1004 facing each other, and install the first limiting block 5 on the first fastening block 1 and the third fastening block 3;
[0054] Step 2: Place the fiber bundle into the first grooves 1002 of the first fastening block 1 and the third fastening block 3, and snap the fiber bundle into the limiting holes in the centers of the first cylinders 1001 of the first fastening block 1 and the third fastening block 3 to fix the position;
[0055] Step 3: Place the second fastening block 2 and the fourth fastening block 4 symmetrically, with the third protrusion 2004 facing each other, and install the second limiting block 6 on the second fastening block 2 and the fourth fastening block 4;
[0056] Step 4: Splice the second fastening block 2, the fourth fastening block 4, and the second limiting block 6 installed in Step 3 together with the first fastening block 1, the third fastening block 3, and the first limiting block 5 after threading the fiber bundle in Step 2, and fix the connection through the first pin block 7; during this process, the fiber needs to be kept in a straightened state all the time;
[0057] Step 5: Wind the fiber bundle around the first cylinder 1001 and the second cylinder 2001 respectively through the annular grooves on the circumferential surfaces of the first cylinder 1001 and the second cylinder 2001, and fasten with the first fastening sleeve 11 and the second fastening sleeve 12; the first fastening sleeve 11 and the second fastening sleeve 12 are provided with fourth protrusions 1101 that fit the annular grooves, and the fourth protrusions 1101 can be sleeved on the first cylinder 1001 and the second cylinder 2001 through the annular grooves and rotated to fit on the first cylinder 1001 and the second cylinder 2001 to perform double fastening on the fiber:
[0058] Step 6: Clamp the assembled stretching assistance device on a tensile testing machine, and start the tensile test after removing the first limiting block 5 and the second limiting block 6;
[0059] Step 7: After the tensile test is completed, remove the stretching assistance device, remove the first pin block 7, the first fastening sleeve 11, and the second fastening sleeve 12, and replace the fiber bundle for testing.
[0060] The present invention is applied to the high-precision tensile test of single fibers and fiber bundles under different temperature environmental conditions using an electronic universal testing machine. By using the present invention, the mechanical properties of fiber bundles under different treatments can be tested at different temperatures. During the experiment, the coaxiality of the test section and the instrument pull rod is ensured, and the problem of stress concentration that may occur at the bonding site due to the use of adhesives is avoided. At the same time, the fiber bundle and the single-filament fiber are doubly fastened. Finally, after the installation is completed, an extensometer can be used to clamp the device before the tensile test starts, further increasing the test accuracy. In the traditional method, metal sheets are fixed with adhesives, and the adhesives will affect the accuracy of the experiment. Based on the abandonment of adhesives, the present invention reduces the experimental cost and enables the auxiliary plate to be reused. The fixture has a simple structure, is easy to manufacture, and can be produced.
[0061] The present invention does not use adhesives and designs a quick-installable fiber wide-temperature high-precision tensile auxiliary device, which can reduce the test cost while increasing the number of uses and can be reused. At the same time, the present invention can control the position of the fiber test section, ensure the coaxiality of the test section and the tensile testing machine, avoid possible stress concentration, and further ensure the accuracy of the test. For the disposable fixed auxiliary plate using adhesives, due to the characteristics of the adhesives, they may absorb stress waves during the test or cause stress concentration on the fibers at the bonding edge, resulting in inaccurate tests. Moreover, the adhesives and the thin metal auxiliary plates increase the test cost, and due to the characteristics of the glue itself, it cannot be used in a high-temperature environment, so the mechanical properties of the test piece cannot be tested under high-temperature conditions. However, the present invention can be used immediately, saving the time required for the adhesive of the auxiliary plate to solidify, can be tested under different temperature loads, and an extensometer can be clamped on the device before the test, which has higher accuracy than the traditional test and increases the accuracy of the test results.
[0062] The present invention can be used for the mechanical property testing of single fibers and fiber bundles under quasi-static tensile environments, which can ensure the coaxiality between the fiber test section and the machine pull rod during clamping, avoiding the possible deviations or errors in traditional methods, thereby ensuring the accuracy of tensile testing; ensuring the length of fiber testing, avoiding stress concentration during the traditional tensile testing process, ensuring uniform stress distribution in the fiber bundle throughout the tensile process, and improving the reliability of the experiment; at the same time, this device is not only applicable to the conventional room temperature environment, but also capable of performing high-precision mechanical tests under different temperature conditions, which is particularly important for the performance evaluation of fibers and fiber bundles in different working environments, especially their performance at extreme temperatures; at the same time, the test does not require pre-gluing and prefabrication, and can directly clamp the fibers or fiber bundles for testing, reducing the complexity and cost of the experiment; finally, after the device is installed, an extensometer can be used for clamping to ensure the accuracy of the test results. Generally speaking, the present invention provides a fiber tensile test auxiliary device with a simple structure, convenient operation and high precision, which can provide more reliable support for the mechanical property testing of fiber materials.
[0063] In addition to the above embodiments, the present invention may have other implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.
Claims
1. A quick-installable fiber wide-temperature high-precision stretching auxiliary device, characterized in that: It includes a first fastening block (1), a second fastening block (2) detachably connected to the first fastening block (1), a third fastening block (3) having the same structure as the first fastening block (1) and symmetrically arranged, and a fourth fastening block (4) having the same structure as the second fastening block (2) and symmetrically arranged, a first limiting block (5) disposed between the first fastening block (1) and the third fastening block (3), and a second limiting block (6) disposed between the second fastening block (2) and the fourth fastening block (4). The first limiting block (5) and the second limiting block (6) have the same structure. The first fastening block (1) is generally rectangular in shape and includes a first groove (1002) opened at the center of any one surface of the first fastening block (1) and parallel to this plane, a connecting plate (1003) disposed on the same surface as the first groove (1002), a second protrusion (1004) disposed on the surface perpendicular to the surface where the first groove (1002) is located, and a first cylinder (1001) disposed on the surface away from the second protrusion (1004). A groove is opened at one end of the first cylinder (1001) close to the first groove (1002), and a limiting hole is opened at the center of the first cylinder (1001) parallel to the first groove (1002). An annular groove is opened on the surface of the first cylinder (1001) parallel to the first groove (1002), and the annular groove is perpendicular to the first groove (1002). A first protrusion (2002) is provided on the surface of the second fastening block (2) that is spliced with the first fastening block (1). The first protrusion (2002) is matched with the first groove (1002) on the first fastening block (1) for splicing. A first through hole (2003) is provided through the corresponding position of the second fastening block (2). The first through hole (2003) is perpendicular to the first protrusion (2002) and is connected to the connecting plate (1003) on the first fastening block (1). The second fastening block (2) further includes a third protrusion (2004). The third protrusion (2004) is disposed on the surface perpendicular to the first protrusion (2002). A second cylinder (2001) is provided on the surface of the second fastening block (2) away from the third protrusion (2004). The shape of the second cylinder (2001) is the same as the shape of the groove opened on the first cylinder (1001) of the first fastening block (1). After the first cylinder (1001) and the second cylinder (2001) are spliced, a complete cylinder is formed. An annular groove is opened at the corresponding position on the circumferential surface of the second cylinder (2001), and a limiting hole is opened at the corresponding position of the second cylinder (2001) parallel to the first protrusion (2002). The first limiting block (5) is generally strip-shaped. Grooves having the same shape as the second protrusion (1004) are provided at both ends in the length direction of the first limiting block (5). Grooves having the same shape as the third protrusion (2004) are provided at both ends in the length direction of the second limiting block (6).The stretching auxiliary device further includes a first fastening sleeve (11) sleeved on the first cylinder (1001) of the spliced first fastening block (1) and the second cylinder (2001) of the second fastening block (2), and a second fastening sleeve (12) sleeved on the first cylinder (1001) of the spliced third fastening block (3) and the second cylinder (2001) of the fourth fastening block (4).; 2. The quick-installable fiber wide-temperature high-precision stretching auxiliary device according to claim 1, characterized in that: The stretching auxiliary device further includes a first pin block (7). The length of the connecting plate (1003) is greater than the depth of the first through hole (2003). A through hole is provided at a position of the connecting plate (1003) away from the first groove (1002), and this through hole is perpendicular to both the first groove (1002) and the connecting plate (1003). The first pin block (7) passes through the through hole in the connecting plate (1003) to fix the first fastening block (1) and the second fastening block (2) together.
3. The quick-installable fiber wide-temperature high-precision stretching auxiliary device according to claim 2, wherein: The cylinder formed by splicing the first cylinder (1001) and the second cylinder (2001) is a cylinder, and its axis is parallel to the first groove (1002); annular grooves are provided on the circumferential surfaces of the first cylinder (1001) and the second cylinder (2001).
4. The quickly-installable fiber wide-temperature high-precision stretching auxiliary device according to claim 3, characterized in that: The first groove (1002) is arc-shaped; the second protrusion (1004) and the third protrusion (2004) are semi-cylindrical.
5. The quick-installable fiber wide-temperature high-precision stretching auxiliary device according to claim 3, characterized in that: A groove is provided on one surface of the first cylinder (1001) away from the second protrusion (1004). This groove passes through the limiting hole at the center of the first cylinder (1001) and extends along the surface of the first cylinder (1001) to the annular groove on the circumferential surface of the first cylinder (1001).
6. The quickly-installable fiber wide-temperature high-precision stretching auxiliary device according to claim 3, characterized in that: A groove is also provided on the surface of the second cylinder (2001) away from the third protrusion (2004), and it extends along the surface of the second cylinder (2001) to the annular groove on the circumferential surface of the second cylinder (2001).
7. The quick-installable fiber wide-temperature high-precision stretching auxiliary device according to claim 3, wherein: The number of the connecting plates (1003) and the first through holes (2003) is four each, and they are symmetrically arranged relative to the first groove (1002) and the first protrusion (2002) respectively; the first fastening block (1) and the second fastening block (2) are fixedly connected through the first pin block (7) and the second pin block (8), and the third fastening block (3) and the fourth fastening block (4) are fixedly connected through the third pin block (9) and the fourth pin block (10); the structures of the second pin block (8), the third pin block (9) and the fourth pin block (10) are the same as that of the first pin block (7).
8. The quickly-installable fiber wide-temperature high-precision stretching auxiliary device according to claim 3, characterized in that: A spring is provided at one end of the connecting plate (1003) away from the first groove (1002) along the direction of the first through hole (2003). One end of the spring contacts the first pin block (7), and the other end is fixedly connected to a limiting plate (1005), and the limiting plate (1005) is fixedly connected to the connecting plate (1003).
9. The quick-installable fiber wide-temperature high-precision stretching auxiliary device according to claim 3, characterized in that: A number of fourth protrusions (1101) are provided on the inner walls of the first fastening sleeve (11) and the second fastening sleeve (12) along the circumferential direction.
10. A method for using a quick-installable fiber wide-temperature high-precision stretching auxiliary device according to any one of claims 4 to 9, characterized in that: It includes the following steps: Step 1: Place the first fastening block (1) and the third fastening block (3) symmetrically, with the second protrusions (1004) facing each other, and install the first limiting block (5) on the first fastening block (1) and the third fastening block (3); Step 2: Place the fiber bundle into the first groove (1002), and snap the fiber bundle into the limiting hole at the center of the first cylinder (1001); Step 3: Place the second fastening block (2) and the fourth fastening block (4) symmetrically, with the third protrusions (2004) facing each other, and install the second limiting block (6) on the second fastening block (2) and the fourth fastening block (4); Step 4: Assemble the second fastening block (2), the fourth fastening block (4), and the second limiting block (6) installed in Step 3 with the first fastening block (1), the third fastening block (3), and the first limiting block (5) into which the fiber bundle was inserted in Step 2, and fix them by the first pin block (7); Step 5: Wind the fiber bundle around the circumferential surfaces of the first cylinder (1001) and the second cylinder (2001) through the annular grooves on the circumferential surfaces of the first cylinder (1001) and the second cylinder (2001), and fasten them with the first fastening sleeve (11) and the second fastening sleeve (12); Step 6: Clamp the assembled stretching auxiliary device on the stretching testing machine, remove the first limiting block (5) and the second limiting block (6), and then start the stretching test; Step 7: After the stretching test is completed, remove the stretching auxiliary device, remove the first pin block (7), the first fastening sleeve (11), and the second fastening sleeve (12), and replace the fiber bundle for testing.