Tensile test device and test method for knitted fabrics

Abstract

The present application relates to the field of testing equipment, and in particular to a tensile testing device and a testing method for knitted fabrics, comprising a lifting body, wherein a movable clamp is installed inside the lifting body for lifting and sliding movement, and the lifting body is also provided with a fixed clamp, wherein the fixed clamp comprises a first clamp, a second clamp, a locking rod and a locking ring, wherein the first clamp is fixedly installed on the lifting body, one end of the locking rod is fixedly connected to the first clamp, the second clamp is provided with a through hole for the locking rod to pass through, the locking ring is threadedly sleeved on the locking rod, the top side of the second clamp is provided with a telescopic groove, the telescopic groove is provided with a rack for telescopic movement, the second clamp is provided with a rotating port connected to the telescopic groove on one side close to the first clamp, a gear is rotatably installed inside the rotating port, the gear is meshed with the rack, and the fixed clamp and the movable clamp have the same structure and are symmetrically arranged up and down. The present application has the effect of improving the accuracy of the experimental results.

Description

Technical Field

[0001] The present application relates to the field of testing equipment, and in particular to a tensile testing device and a testing method for knitted fabrics. Background Art

[0002] Tensile testing devices are widely used in the field of textile quality testing. They evaluate the strength and durability of fabrics by simulating tensile stress under actual use conditions. This technology is of great significance for ensuring product quality, optimizing production processes, and meeting the diverse needs of the market. With the rapid development of the textile industry, the requirements for tensile testing equipment are also increasing, especially in terms of accuracy, reliability and automation level, which have continuously made breakthroughs and promoted the progress and technological innovation of the entire industry.

[0003] At present, when testing the tensile properties of knitted fabrics, a fixed fixture and a movable fixture are usually used to achieve sample clamping and stretching operations.

[0004] However, due to the smooth surface of some fabrics, the wear of the fixtures, or the operator's operating errors, the fabric may slip when the movable fixture and the fixed fixture clamp the fabric for stretching. If the fabric moves a small distance after slipping, it is difficult for the experimenter to find that the fabric has slipped and to re-run the experiment. Then, the experimental results of the slipped fabric are directly used to calculate the tensile strength, which reduces the accuracy of the experimental results. Summary of the invention

[0005] In order to improve the accuracy of experimental results, the present application provides a tensile test device and a test method for knitted fabrics.

[0006] The tensile test device and test method for knitted fabrics provided in this application adopt the following technical solutions: The tensile testing device for knitted fabrics comprises a lifting body, wherein a movable clamp is installed inside the lifting body for lifting and sliding movement, and the lifting body is also provided with a fixed clamp, wherein the fixed clamp comprises a first clamp, a second clamp, a locking rod and a locking ring, wherein the first clamp is fixedly installed on the lifting body, one end of the locking rod is fixedly connected to the first clamp, the second clamp is provided with a through hole for the locking rod to pass through, the locking ring is threadedly sleeved on the locking rod, a telescopic groove is provided on the top side of the second clamp, a rack is provided on the telescopic groove for telescopic movement, a rotating opening connected to the telescopic groove is provided on the side of the second clamp close to the first clamp, a gear is rotatably installed inside the rotating opening, the gear is meshed with the rack, and the fixed clamp and the movable clamp have the same structure and are symmetrically arranged up and down.

[0007] By adopting the above technical solution and utilizing the meshing structure of the rack and the gear, when the fabric slips, the fabric drives the rack to move through the gear, thereby facilitating the detection of whether there is slippage. This design significantly improves the reliability of the test results and ensures the accuracy of the tensile performance measurement.

[0008] Optionally, a pressure sensor is fixedly installed on the inner bottom wall of the telescopic slot, a push plate and a pressure plate are provided between the rack and the pressure sensor, a spring is fixedly installed between the push plate and the pressure plate, and the spring is used to drive the pressure plate and the push plate away from each other.

[0009] By adopting the above technical solution, when the fabric slips and drives the rack to move, the rack will push the push plate to compress the spring, so that the pressure plate moves toward the pressure sensor and applies pressure. The change in pressure on the pressure sensor can be used to determine whether the fabric is slipping, so that the experimenter can easily find the fabric slipping and repeat the experiment.

[0010] Optionally, a sliding groove is provided on a side of the second clamping plate close to the first clamping plate, and the sliding groove is located below the rotating mouth. A slider is slidably penetrated inside the sliding groove, and a movable mouth connected to the rotating mouth is provided on the inner wall of the sliding groove. The slider is hinged with a limit plate, and the limit plate is penetrated through the movable mouth and enters the rotating mouth. When the slider abuts against the inner bottom wall of the sliding groove, the limit plate abuts against the inner wall of the movable mouth away from the first clamping plate, and the limit plate is used to limit the rotation direction of the gear.

[0011] By adopting the above technical solution, the rotation direction of the rack driven by the gear when the cloth slips is opposite to the movement direction of the rack driven by the spring. The movement of the rack driven by the spring can be limited by the mutual compression of the gear and the cloth, and the gear is clamped by the limit plate, thereby further limiting the movement of the rack driven by the spring.

[0012] Optionally, the movable opening is inclined from one end connected to the rotating opening to the other end gradually approaching the first clamping plate.

[0013] By adopting the above technical solution, the inclined direction of the movable opening is conducive to guiding the tilting direction of the limit plate, thereby facilitating the limit plate to be used to limit the rotation direction of the gear.

[0014] Optionally, an elastic block is embedded on the side of the slider away from the first clamping plate. When the slider is against the bottom wall of the sliding groove, the elastic block is pressed and flush with the side of the slider away from the first clamping plate. When the elastic block is not pressed, the elastic block protrudes from the side of the slider away from the first clamping plate.

[0015] By adopting the above technical solution, when the first clamping plate and the second clamping plate move away from each other to loosen the fabric, the elastic block drives the slider to move, so that the limit plate stops limiting the rotation direction of the gear, thereby making it convenient for the experimenter to adjust the position of the telescopic rod before the stretching experiment begins.

[0016] Optionally, an adjustment port connected to the telescopic slot is formed on a side of the second clamping plate away from the first clamping plate, an adjustment rod is threadedly inserted on a side of the rack away from the gear, and the adjustment rod is slidably inserted into the adjustment port.

[0017] By adopting the above technical solution, the adjusting rod is engaged with the adjusting port, thereby limiting the rack from sliding out of the telescopic slot.

[0018] Optionally, a support rod is provided on a side of the second clamping plate away from the first clamping plate, the support rod is used to support the adjustment rod, a hanging rod is fixedly mounted on the support rod, and the hanging rod is L-shaped.

[0019] By adopting the above technical solution, before the lifting body drives the movable clamp to stretch the fabric, the hanging rod is hung on the second clamping plate, and the supporting rod supports the adjusting rod, so as to facilitate the resetting of the adjusting rod.

[0020] Optionally, the gear is coaxially provided with a rotating rod, the rotating rod rotates through the gear, the second clamping plate is provided with a rotating hole, the rotating port is connected to the rotating hole, and the rotating rod is rotatably inserted into the rotating hole.

[0021] By adopting the above technical solution, the stable rotation of the gear is achieved. Specifically, the gear is coaxially provided with a rotating rod, and the rotating rod cooperates with the rotating hole on the second clamping plate, ensuring that the gear can rotate smoothly when subjected to external force, avoiding the problem of unstable clamping caused by loose or offset gears, thereby improving the overall reliability of the test device.

[0022] Optionally, a portion of the rotating rod outside the gear is sleeved with an elastic sleeve.

[0023] By adopting the above technical solution, the elastic sleeve is sleeved on the part of the rotating rod outside the gear, which can effectively reduce the friction damage between the rotating rod and the external components and improve the service life of the equipment. At the same time, it is also convenient for the gear to press the cloth.

[0024] The tensile test method comprises the following steps: Use movable clamps and fixed clamps to clamp the fabric to be tested; The lifting host drives the movable fixture to rise until the fabric to be tested breaks and stops; Check whether the rack moves; if so, the fabric slips and is retested; if not, the tensile performance is calculated based on the pulling force required when the movable fixture pulls the fabric to be tested to break.

[0025] By adopting the above technical solution, after the fabric is clamped and stretched, the change in the rack position can be detected to accurately determine whether the fabric is slipping. Once the rack is found to move, it means that the fabric is slipping and needs to be retested, thereby reducing the occurrence of data deviations caused by fixture wear or improper operation, and significantly improving the credibility and accuracy of the test results.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: The meshing design of the gear and rack enables the tiny displacement of the fabric during the stretching process to be converted into obvious mechanical movement, which makes it easier for experimenters to accurately determine whether there is slippage and significantly improves the accuracy of the tensile test results. During the process of stretching the fabric, the gear and the fabric squeeze each other, thereby limiting the movement of the rack driven by the spring, and then limiting the rotation direction of the gear through the limit plate, thereby further reducing the occurrence of the situation where the rack is driven by the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a schematic diagram of the overall structure of the fixing fixture of an embodiment of the present application; Figure 3 yes Figure 2 Sectional view at AA; Figure 4 yes Figure 3 A cross-sectional view at point A; Figure 5 It is an exploded view of the rotating rod and the gear in the embodiment of the present application.

[0028] Explanation of the accompanying drawings: 1. lifting body; 2. movable clamp; 3. fixed clamp; 31. first clamp; 32. second clamp; 33. locking rod; 34. locking ring; 4. telescopic slot; 5. rotating mouth; 6. rack; 7. gear; 8. rotating rod; 9. hanging rod; 10. elastic sleeve; 11. pressure sensor; 12. push plate; 13. pressure plate; 14. spring; 15. sliding slot; 16. slider; 17. limit plate; 18. movable mouth; 19. elastic block; 20. adjustment mouth; 21. adjustment rod; 22. support rod. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-5 This application is described in further detail.

[0030] The embodiments of the present application disclose a tensile test device and a test method for knitted fabrics.

[0031] Reference Figure 1The tensile testing device for knitted fabrics comprises a lifting body 1, a movable clamp 2 is installed inside the lifting body 1 for lifting and sliding, and the lifting body 1 is also provided with a fixed clamp 3.

[0032] Reference Figure 2 , Figure 3 The fixing fixture 3 includes a first clamping plate 31, a second clamping plate 32, a locking rod 33 and a locking ring 34. The first clamping plate 31 is fixedly mounted on the inner bottom wall of the lifting body 1, one end of the locking rod 33 is fixedly connected to the first clamping plate 31, the second clamping plate 32 is provided with a through hole for the locking rod 33 to pass through, and the locking ring 34 is threadedly sleeved on the locking rod 33.

[0033] The cloth is placed between the first clamping plate 31 and the second clamping plate 32, and then the locking ring 34 is rotated. The locking ring 34 drives the second clamping plate 32 to press the cloth against the first clamping plate 31, so that the fixed clamp 3 can clamp the cloth. After the movable clamp 2 also clamps the cloth, the lifting body 1 drives the movable clamp 2 to rise, thereby stretching the cloth. After the cloth breaks, the lifting body 1 stops driving the movable clamp 2 to move. The experimenter calculates the cloth's tensile resistance based on the pulling force required for the lifting body 1 to drive the movable clamp 2 to break the cloth.

[0034] Reference Figure 3 , Figure 4 The top side of the second clamping plate 32 is provided with a plurality of telescopic slots 4, and the side of the second clamping plate 32 close to the first clamping plate 31 is provided with a plurality of rotating openings 5. The rotating openings 5 ​​correspond to the telescopic slots 4 one by one, and the rotating openings 5 ​​are connected with the telescopic slots 4. The telescopic slots 4 are provided with racks 6 for telescoping, and a gear 7 meshing with the rack 6 is provided inside the rotating openings 5. A rotating rod 8 is provided coaxially with the gear 7, and the rotating rod 8 rotates and penetrates the gear 7. The second clamping plate 32 is provided with a rotating hole, and the rotating opening 5 is connected with the rotating hole, and the rotating rod 8 is rotatably penetrated in the rotating hole.

[0035] The rotating hole penetrates from one side to the other side of the second clamping plate 32, thereby connecting each rotating port 5. After the rotating rod 8 passes through the rotating hole and each gear 7, it is convenient for the gear 7 to rotate inside the rotating port 5.

[0036] Reference Figure 5 The part of the rotating rod 8 outside the gear 7 is sleeved with an elastic sleeve 10. The elastic force of the elastic sleeve 10 blocks the rotating hole, thereby increasing the resistance of the rotating rod 8 being inserted into the rotating hole, thereby reducing the situation where the rotating rod 8 is automatically pulled out of the rotating hole.

[0037] When the fixed clamp 3 and the movable clamp 2 do not clamp the fabric, the gear 7 is partially outside the rotating opening 5. When the fixed clamp 3 and the movable clamp 2 clamp the fabric, the gear 7 is squeezed and retracted into the rotating opening 5 by the elasticity of the elastic sleeve 10, and the gear 7 is tightly against the fabric.

[0038] When the fixed clamp 3 and the movable clamp 2 clamp the fabric for stretching, if the fabric slips and moves, the fabric will drive the gear 7 to rotate, and the gear 7 drives the rack 6 to move. The experimenter can judge whether the fabric slips by the position change of the rack 6, so that the experimenter can find the fabric slip and re-test, thereby improving the accuracy of the tensile test results.

[0039] Reference Figure 3 A pressure sensor 11 is fixedly installed on the inner bottom wall of the telescopic slot 4, a push plate 12 and a pressure plate 13 are arranged between the rack 6 and the pressure sensor 11, a spring 14 is fixedly installed between the push plate 12 and the pressure plate 13, and the spring 14 is used to drive the pressure plate 13 and the push plate 12 away from each other, the push plate 12 is pressed against the rack 6, and the pressure plate 13 is pressed against the pressure sensor 11.

[0040] The fabric slips and drives the gear 7 to rotate. The gear 7 drives the rack 6 to move toward the pressure sensor 11 to press the push plate 12. Then the push plate 12 applies pressure to the pressure sensor 11 through the spring 14 and the pressure plate 13, so that the pressure detected by the pressure sensor 11 changes. The lifting body 1 is integrated with a controller, which analyzes the results of the pressure sensor 11 to obtain the pressure on the pressure sensor 11. The experimenter judges whether the fabric slips by the pressure change on the pressure sensor 11.

[0041] Reference Figure 4 A sliding groove 15 is provided on one side of the second clamping plate 32 close to the first clamping plate 31, and the sliding groove 15 is located below the rotating opening 5. A slider 16 is slidably penetrated inside the sliding groove 15, and a movable opening 18 connected to the rotating opening 5 is provided on the inner wall of the sliding groove 15. The slider 16 is hingedly connected to a limit plate 17, and the limit plate 17 is penetrated through the movable opening 18 and enters the rotating opening 5.

[0042] When the first clamping plate 31 and the second clamping plate 32 clamp the fabric, the slider 16 is squeezed back into the sliding groove 15, so that the slider 16 abuts against the inner bottom wall of the sliding groove 15. When the slider 16 abuts against the inner bottom wall of the sliding groove 15, the limit plate 17 abuts against the inner wall of the movable opening 18 away from the first clamping plate 31. When the elastic force of the spring 14 drives the rack 6 to move away from the pressure sensor 11, the limit plate 17 is engaged with the gear 7. Since the limit plate 17 abuts against the inner wall of the movable opening 18 away from the first clamping plate 31, the limit plate 17 cannot continue to rotate away from the first clamping plate 31, thereby limiting the rotation direction of the gear 7. When the fabric slips, the fabric drives the gear 7, and the gear 7 pushes the limit plate 17 to flip toward the first clamping plate 31, thereby facilitating the rotation of the gear 7.

[0043] The movable opening 18 is inclined from one end connected to the rotating opening 5 to the other end gradually approaching the first clamping plate 31. The inclination of the movable opening 18 is conducive to guiding the tilting direction of the limiting plate 17, so that the limiting plate 17 is convenient for limiting the rotation direction of the gear 7.

[0044] The elastic block 19 is embedded in the side of the slider 16 away from the first clamping plate 31. When the slider 16 abuts against the inner bottom wall of the sliding groove 15, the elastic block 19 is pressed and flush with the side of the slider 16 away from the first clamping plate 31. When the elastic block 19 is not pressed, the elastic block 19 protrudes from the side of the slider 16 away from the first clamping plate 31.

[0045] After the first clamping plate 31 and the second clamping plate 32 release the cloth, the elastic block 19 drives the slider 16 to move toward the first clamping plate 31, so that the limit plate 17 can rotate close to or away from the first clamping plate 31 in the movable opening 18, thereby facilitating the adjustment of the top of each rack 6 to the same position. By keeping each rack 6 at the same position before stretching the cloth, it is convenient for the experimenter to find that the cloth is slipping.

[0046] Reference Figure 2 , Figure 3 The second clamping plate 32 is provided with an adjustment port 20 connected to the telescopic slot 4 on one side away from the first clamping plate 31, and the rack 6 is threadedly plugged with an adjustment rod 21 on one side away from the gear 7, and the adjustment rod 21 is slidably inserted into the adjustment port 20. The second clamping plate 32 is provided with a support rod 22 on one side away from the first clamping plate 31, and the support rod 22 is used to support the adjustment rod 21, and the support rod 22 is fixedly installed with a suspension rod 9, and the suspension rod 9 is L-shaped.

[0047] The adjustment rod 21 is engaged with the adjustment port 20, thereby limiting the rack 6 from being pulled out of the telescopic slot 4. At the same time, after the rack 6 or the adjustment rod 21 is worn, the adjustment rod 21 can be unscrewed from the rack 6, thereby facilitating the replacement of the rack 6 and the adjustment rod 21. In the process of clamping the cloth by the movable clamp 2 and the fixed clamp 3, the experimenter may need to pull the cloth to adjust the position. When the experimenter pulls the cloth, the cloth will drive the gear 7 to move. The support rod 22 supports each adjustment rod 21 by hanging on the second clamping plate 32 through the hanging rod 9, so that it is convenient to make each rack 6 extend out of the telescopic slot 4 to the same length, while reducing the situation where the experimenter pulls the cloth to drive the gear 7 to rotate.

[0048] In the embodiment of the present application, the movable clamp 2 and the fixed clamp 3 have the same structure and are symmetrically arranged up and down.

[0049] The tensile test method, using the tensile test device of this embodiment, comprises the following steps: Use the movable clamp 2 and the fixed clamp 3 to clamp the fabric to be tested; The lifting host drives the movable fixture 2 to rise until the fabric to be tested breaks and stops; Check whether the rack 6 moves; if so, the fabric slips and is retested; if not, the tensile performance is calculated based on the pulling force required when the movable clamp 2 pulls the fabric to be tested to break.

[0050] The implementation principle of the tensile test device and test method for knitted fabrics in the embodiment of the present application is as follows: at the beginning, the hanging rod 9 is hung on the second clamping plate 32, and the support rod 22 supports each adjustment rod 21, so that each rack 6 extends out of the telescopic slot 4 to the same length. The support rod 22 drives the adjustment rod 21 to abut against the inner bottom wall at one end of the adjustment port 20, thereby limiting the adjustment rod 21 from sliding inside the adjustment port 20, thereby limiting the movement of the rack 6 and the rotation of the gear 7.

[0051] The cloth is placed between the first clamping plate 31 and the second clamping plate 32, and the locking ring 34 is rotated, so that the locking ring 34 drives the dripping clamping plate to move, and the second clamping plate 32 presses the cloth against the first clamping plate 31. After the second clamping plate 32 presses the cloth against the first clamping plate 31, the hanging rod 9 is removed from the second clamping plate 32, so as to facilitate the sliding of the adjustment rod 21 in the adjustment port 20, and then facilitate the movement of the rack 6 and the rotation of the gear 7.

[0052] At the same time, after the first clamping plate 31 and the second clamping plate 32 clamp the fabric, the slider 16 is squeezed back into the sliding groove 15 by the first clamping plate 31, so that the limit plate 17 abuts against the inner wall of the movable opening 18 away from the first clamping plate 31, thereby limiting the limit plate 17 from turning away from the first clamping plate 31. When the elastic force of the spring 14 drives the rack 6 to move, the limit plate 17 engages with the gear 7, thereby limiting the movement of the rack 6. When the fabric slips, the fabric drives the gear 7 to rotate, and the limit plate 17 turns toward the first clamping plate 31, thereby facilitating the rotation of the gear 7.

[0053] Then the lifting body 1 drives the movable clamp 2 to rise and stretch the fabric until the fabric breaks. After the fabric breaks, the experimenter determines whether the fabric is slipping by observing whether the position of the gear 7 changes or whether the pressure detected by the pressure sensor 11 changes. If the fabric is slipping, the experimenter restarts the experiment. If the fabric is not slipping, the experimenter calculates the tensile performance based on the pulling force required by the movable clamp 2 to pull the fabric to be tested to break.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. The tensile test device for knitted fabrics is characterized by: The invention comprises a lifting body (1), wherein a movable clamp (2) is installed inside the lifting body (1) for lifting and sliding movement, and the lifting body (1) is also provided with a fixed clamp (3), wherein the fixed clamp (3) comprises a first clamping plate (31), a second clamping plate (32), a locking rod (33) and a locking ring (34), wherein the first clamping plate (31) is fixedly installed on the lifting body (1), one end of the locking rod (33) is fixedly connected to the first clamping plate (31), and the second clamping plate (32) is provided with a through hole for the locking rod (33) to pass through. The locking ring (34) is threadedly sleeved on the locking rod (33); a telescopic groove (4) is provided on the top side of the second clamp (32); a rack (6) is telescopically arranged in the telescopic groove (4); a rotating opening (5) connected to the telescopic groove (4) is provided on the side of the second clamp (32) close to the first clamp (31); a gear (7) is rotatably installed inside the rotating opening (5); the gear (7) is meshed with the rack (6); the fixed clamp (3) and the movable clamp (2) have the same structure and are symmetrically arranged up and down.

2. The tensile strength test device for knitted fabrics according to claim 1, characterized in that: A pressure sensor (11) is fixedly mounted on the inner bottom wall of the telescopic slot (4); a push plate (12) and a pressure plate (13) are provided between the rack (6) and the pressure sensor (11); a spring (14) is fixedly mounted between the push plate (12) and the pressure plate (13); the spring (14) is used to drive the pressure plate (13) and the push plate (12) to move away from each other.

3. The tensile strength test device for knitted fabrics according to claim 2, characterized in that: A sliding groove (15) is provided on a side of the second clamping plate (32) close to the first clamping plate (31), the sliding groove (15) being located below the rotating opening (5), a sliding block (16) being slidably penetrated inside the sliding groove (15), an active opening (18) connected to the rotating opening (5) being provided on the inner wall of the sliding groove (15), the sliding block (16) being hingedly connected to a limiting plate (17), the limiting plate (17) being penetrated through the active opening (18) and entering the rotating opening (5), when the sliding block (16) is in contact with the inner bottom wall of the sliding groove (15), the limiting plate (17) is in contact with the inner wall of the active opening (18) away from the first clamping plate (31), and the limiting plate (17) is used to limit the rotation direction of the gear (7).

4. The tensile strength test device for knitted fabrics according to claim 3, characterized in that: The movable opening (18) is arranged in an inclined manner from one end connected to the rotating opening (5) to the other end gradually approaching the first clamping plate (31).

5. The tensile strength test device for knitted fabrics according to claim 3, characterized in that: An elastic block (19) is embedded on the side of the slider (16) away from the first clamping plate (31); when the slider (16) abuts against the inner bottom wall of the sliding groove (15), the elastic block (19) is pressed to be flush with the side of the slider (16) away from the first clamping plate (31); when the elastic block (19) is not pressed, the elastic block (19) protrudes from the side of the slider (16) away from the first clamping plate (31).

6. The tensile strength test device for knitted fabrics according to claim 1, characterized in that: An adjustment opening (20) connected to the telescopic slot (4) is provided on a side of the second clamping plate (32) away from the first clamping plate (31), and an adjustment rod (21) is threadedly inserted on a side of the rack (6) away from the gear (7), and the adjustment rod (21) is slidably inserted into the adjustment opening (20).

7. The tensile strength test device for knitted fabrics according to claim 6, characterized in that: A support rod (22) is provided on a side of the second clamping plate (32) away from the first clamping plate (31), the support rod (22) being used to support the adjustment rod (21), and a suspension rod (9) is fixedly mounted on the support rod (22), the suspension rod (9) being L-shaped.

8. The tensile strength test device for knitted fabrics according to claim 1, characterized in that: The gear (7) is coaxially provided with a rotating rod (8), the rotating rod (8) rotatably penetrates the gear (7), the second clamping plate (32) is provided with a rotating hole, the rotating opening (5) is connected to the rotating hole, and the rotating rod (8) rotatably penetrates the rotating hole.

9. The tensile strength test device for knitted fabrics according to claim 8, characterized in that: The portion of the rotating rod (8) located outside the gear (7) is sleeved with an elastic sleeve (10).

10. A tensile test method, using the tensile test device for knitted fabrics as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Using a movable clamp (2) and a fixed clamp (3) to clamp the fabric to be tested; The lifting host drives the movable clamp (2) to rise until the fabric to be tested breaks and then stops; Check whether the rack (6) moves; if so, the fabric is slipped and retested; if not, the tensile performance is calculated based on the pulling force required when the movable clamp (2) pulls the fabric to be tested to break.

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