A yarn testing device and method for in-situ testing the tensile and elongation properties of yarns after abrasion

Abstract

The present invention discloses a yarn testing device and method for in-situ testing the tensile and elongation properties of yarns after abrasion, belonging to the technical field of yarn abrasion testing. The device of the present invention includes a bearing panel and, in sequence on the bearing panel, a tension weight groove, a left yarn guide roller, a left stretching channel, a left clamping and stretching assembly, a left tension testing limiting rod, a tension sensing assembly, a right tension testing limiting rod, a yarn limiting channel, a swinging friction assembly, a right clamping and stretching assembly, a right stretching channel, a right yarn guide roller, and a right fixed yarn weight groove; the left clamping and stretching assembly, the tension sensing assembly, and the right clamping and stretching assembly are used to test the tensile strength of the yarn; the swinging friction assembly is used to test the abrasion resistance of the yarn. Through the tension sensing assembly and the clamping assembly, the tensile strength testing device and the abrasion resistance testing device are combined to realize the in-situ testing of the remaining tensile fracture properties of the yarn after abrasion, and on the basis of accurate in-situ testing, the workload of the testing personnel is reduced at the same time.

Description

Technical Field

[0001] The invention relates to a yarn testing device and method for in-situ testing the strength and elongation properties of yarn after abrasion, and belongs to the technical field of yarn abrasion testing. Background Art

[0002] Abrasion resistance and strength and elongation are two important test indicators for textiles. At present, the indicators used to evaluate yarn performance mainly include abrasion resistance times, breaking strength and elongation. The wear resistance of yarn is closely related to the service life of textile products. The yarn abrasion resistance test method can be divided into two categories according to the different abrasives. One is to use yarn as abrasive, and the other is to use metal materials, emery cloth or grinding wheels as abrasives. The tensile performance index of single yarn is one of the main bases for evaluating the grade of yarn. It is of great significance to the formulation of yarn production process, process adjustment, weaving process and production efficiency. The evaluation of yarn strength and elongation mainly uses the Uster single yarn strength tester test.

[0003] In recent years, the transformation of many yarn wear testers has been moving towards the direction of simulated weaving, and new wear testers have gradually emerged, such as the wear test between yarns and yarns, and the wear test between simulated yarns and metal parts of looms when weaving. For example, the patent document CN201911004175.9 provides a yarn fatigue life detection device under dynamic load conditions. The device arranges an introduction roller and a winding device on the frame, and fixes one end of the yarn to the winding device, and connects the other end to a weight through the introduction roller. The weight is used to continuously provide stable tension to the yarn, so that the yarn is transported in a single direction, eliminating the problem of unstable pre-tension caused by the connection at both ends of the yarn. For the simultaneous detection of multiple yarns, as long as the weight connected to each yarn If the masses are equal, it can ensure that the tension on each yarn is consistent, thereby improving the detection accuracy; the patent document CN201911004173.X provides a simulated weft beating device, which arranges a swinging friction part on one side of the reed. During the swinging process of the reed, the swinging friction part swings synchronously until it contacts the warp yarn and slides along a distance to simulate the friction force formed between the weft yarn and the warp yarn under the push of the reed, thereby improving the test accuracy of the warp yarn fatigue life test; the patent document CN206788174U provides a sizing yarn detection equipment, which helps textile manufacturers to make a judgment on the sizing yarn performance in advance before weaving and predict the weaving efficiency of the sizing yarn through a yarn guide wheel, a tension control device, a warp stop piece, a heald, a reed, and a yarn break sensing device.

[0004] However, the wear-resistant test device and method for simulating weaving loads must remove the yarn from the device after the test yarn is subjected to a certain load, and then use an independent tensile breaking strength tester to test the remaining breaking strength and elongation. During the transfer process, it will cause problems such as uneven twist distribution due to yarn untwisting and errors in the holding distance due to external human forces. The above method is not only cumbersome and inefficient, but also easily causes additional interference due to manual operation of the yarn, thereby affecting the accuracy of the test results. In addition, the existing wear-resistant test device uses a dropper that straddles the yarn to count the number of wear times and yarn breakage detection of the yarn. During the wear test, the dropper will shake, affecting the force stability of the yarn, and the dropper counting is not sensitive. Summary of the invention

[0005] In order to solve one or more of the above problems, the present invention provides a yarn testing device for in-situ testing the strength and elongation properties of yarn after grinding, comprising a load-bearing panel and a tension weight slot, a left yarn guide roller, a left stretching channel, a left clamping stretching assembly, a left tension test limit rod, a tension sensing assembly, a right tension test limit rod, a yarn limit channel, a swing friction assembly, a right clamping stretching assembly, a right stretching channel, a right yarn guide roller and a right fixed yarn weight slot sequentially located on the load-bearing panel;

[0006] Among them, the left clamping and stretching assembly, the tension sensing assembly and the right clamping and stretching assembly are used to test the tensile strength of the yarn;

[0007] The oscillating friction assembly is used to test the abrasion resistance of yarns.

[0008] In one embodiment, the left clamping and stretching assembly has the same structure as the right clamping and stretching assembly, and consists of a spring valve, a fixed clamping plate, a movable clamping plate, a silicone clamping gasket, a slider base, a servo motor rotating shaft, a slot limit plate and a limit slider; the spring valve is located at the end of the slider base away from the load-bearing panel, and is connected to the movable clamping plate; the fixed clamping plate is fixed on the slider base; the movable clamping plate is located in the slider base; the slider base is fixedly connected to the limit slider; the slot limit plate is fixedly connected to the slider base and is installed in the left stretching channel; the servo motor rotating shaft is a worm gear, which cooperates with the internal thread of the limit slider; the silicone clamping gasket is fixed on the movable clamping plate, and is located between the movable clamping plate and the fixed clamping plate.

[0009] In one embodiment, the tension sensing assembly is composed of a yarn guide pulley, a tension sensing element and a support base, and forms a tension testing module together with a left tension test limit support rod, a left limit slot, a right tension test limit support rod and a right limit slot; the left limit slot is fixed on the left tension test limit support rod, the right limit slot is fixed on the right tension test limit support rod, and the left tension test limit support rod and the right tension test limit support rod are fixed on the same horizontal plane on the load-bearing panel; the yarn guide pulley is fixed on the tension sensing element, a groove is provided on the pulley, the tension sensing element is fixed to the support base, and the support base is fixed on the load-bearing panel; the yarn guide pulley is located between the left tension test limit support rod and the right tension test limit support rod, and above the left limit slot and the right limit slot.

[0010] In one embodiment, the device also includes a longitudinal lifting component and a longitudinal lifting groove. The longitudinal lifting component is a smooth stainless steel rod, which is located in the longitudinal lifting groove and is fixedly connected to a linear drive mechanism installed on the bearing panel. It can move vertically up and down in the longitudinal lifting groove.

[0011] In one embodiment, the swing friction assembly consists of a left limit rod, a diamond friction roller, a right limit rod, a front limit rod group moving base, a diamond friction rod separate moving base, a diamond friction rod overall moving base, a right limit rod group moving base and a swing base; the left limit rod is fixed to the front limit rod group moving base, the diamond friction roller is fixed to the diamond friction rod separate moving base, the diamond friction rod separate moving base is fixed to the diamond friction rod overall moving base, and they are bases that can adjust the front and rear positions individually, each base is fixedly connected to a sand friction roller, and the right limit rod is fixed to the right limit rod group moving base; the front limit rod group moving base, the diamond friction rod overall moving base, and the right limit rod group moving base are fixed to the swing base, and the front and rear positions can be adjusted respectively; the swing base is fixed to the output shaft of the servo motor installed on the load-bearing panel.

[0012] In one embodiment, a weight for applying pre-tension weight is suspended in the tension weight slot, and the weight is suspended in the air.

[0013] In one embodiment, the right fixed yarn weight slot is used to hang a high grammage weight to stabilize one end of the yarn during the yarn winding process.

[0014] In one embodiment, a human-machine control panel is placed at the top of the load-bearing panel, and is used to adjust the travel and operating speed of the longitudinal lifting component, the swing angle range and swing operating speed of the swinging friction component, the moving travel and speed of the left clamping and stretching component and the right clamping and stretching component, and to record data on the number of yarn wear resistance, breaking strength, and breaking elongation.

[0015] A method for testing the abrasion resistance of yarns by using the above-mentioned device to in-situ test the residual strength and elongation of the yarns after abrasion, the method comprising the following steps:

[0016] S1: facing the instrument, first hang one end of the yarn around the weight in the right fixed yarn weight slot, the weight is placed at the bottom of the rear weight slot, and the yarn is hung from the back to the front after it is fixed;

[0017] S2: hold the other end through the yarn feeding rear roller and through the right clamping stretching assembly;

[0018] S3: Continue to hold the yarn and pass it through the swinging friction assembly;

[0019] S4: Then the yarn passes through the longitudinal pulling component, the right tension test limit rod, the tension sensing component, the right tension test limit rod, and the yarn passing channel of the left clamping component in sequence, and finally passes through the left yarn feeding roller for output, and the other end of the yarn is hung on the weight for applying pre-tension provided in the tension weight slot, and the weight is placed in the tension weight slot in a suspended state, and it is confirmed that the yarn remains stable under the tension applied by the weight, and finally the clamping component on the right clamping stretching component is fixed;

[0020] S5: adjusting the stroke and running speed of the longitudinal lifting component, the swing angle range and swing running speed of the swing friction component through the human-machine control panel;

[0021] S6: Conduct yarn performance test. In the wear life test mode, the tension sensor component starts the yarn break detection function. When the tension sensor component detects that one of the yarns is worn out, the number of yarn breaks is displayed on the human-machine control panel, and the instrument does not stop working until all ten yarns are worn out. In the attenuation mode test, first set a certain number of pre-friction times for the ten yarns according to the wear mode parameters in the above steps. After the pre-friction is completed, the left clamping and stretching component is controlled to be clamped. At this time, both ends of the yarn are in a clamped and fixed state. Start the strong stretch test. The right clamping and stretching component moves horizontally in the right stretching channel and pulls the yarn toward the rear end until it breaks. During the breaking process, the human-machine control panel records the base movement distance and the yarn tension value measured by the tension sensor.

[0022] S7: Record the data of wear times, breaking strength and breaking elongation through the human-machine control panel.

[0023] The strength loss rate and elongation change rate are used to comprehensively evaluate the performance of the yarn. The calculation method of strength loss rate and elongation change rate is as follows:

[0024]

[0025]

[0026] Among them, the initial breaking strength of the yarn is F 0 , the elongation at break is L0 ; The breaking strength after pre-wear treatment is F, and the breaking elongation is L.

[0027] The beneficial effects of the present invention are:

[0028] (1) The present invention realizes in-situ testing of the residual tensile breaking properties of the yarn after wear, avoiding accidental untwisting, stretching and additional wear of the yarn during the offline testing operation. On the basis of precise in-situ testing, the workload of the tester is reduced at the same time.

[0029] (2) The present invention uses a rigid tension sensor as a component to determine whether the yarn is broken. Unlike the dropper wire straddling the yarn, it will not shake during the wear test, affecting the stability of the yarn force, and avoid the defect of insensitive dropper wire counting. In addition, the use of a tension sensor can realize online testing of the tensile breaking strength of the yarn, monitor the force of the yarn during the entire test cycle, and provide support for analyzing the friction strength of the yarn.

[0030] (3) The present invention is based on a yarn wear resistance testing device and method for in-situ testing of the residual strength and elongation of yarn after abrasion, and proposes to comprehensively evaluate the wear resistance of yarn by strength loss rate and elongation change rate, so as to more comprehensively meet the needs of evaluating yarn performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a schematic diagram of the overall structure of the yarn testing device for in-situ testing the strength and elongation properties of yarn after abrasion according to the present invention;

[0033] Figure 2 It is a schematic diagram of the yarn hanging method of the yarn testing device for in-situ testing the strength and elongation properties of yarn after grinding according to the present invention;

[0034] Figure 3 A schematic diagram of a specific yarn hanging method at a part of a swing friction assembly 12 of a yarn testing device for in-situ testing of the strength and elongation of yarn after grinding;

[0035] Figure 4 It is a structural schematic diagram of the left clamping and stretching assembly 5 of the yarn testing device for in-situ testing the strength and elongation properties of yarn after grinding according to the present invention;

[0036] Figure 5 It is a structural schematic diagram of a tension sensor assembly 7 of a yarn testing device for in-situ testing of the strength and elongation properties of yarn after grinding according to the present invention;

[0037] Figure 6 It is a structural schematic diagram of a swing friction assembly 12 of a yarn testing device for in-situ testing of the strength and elongation properties of yarn after abrasion according to the present invention;

[0038] in,

[0039] 1. Load-bearing panel; 2. Tension weight slot; 3. Left yarn guide roller; 4. Left stretching channel; 5. Left clamping stretching assembly; 501. Spring valve; 502. Fixed clamping plate; 503. Mobile clamping plate; 504. Silicone clamping gasket; 505. Slider base 506. Servo motor rotating shaft; 507. Slot limit plate; 508. Limit slider; 6. Left tension test limit rod; 601. Left tension test limit support rod; 602. Left limit slot; 7. Tension sensor assembly; 701. Yarn guide pulley; 702. Tension sensor; 703. Support base; 8. Right tension test limit rod; 801, right tension test limit support rod; 802, right limit slot; 9, longitudinal pulling slot; 10, longitudinal pulling component; 11, yarn limit channel; 12, swing friction assembly; 121, left limit rod; 122, diamond friction roller; 123, right limit rod; 124, front limit rod group moving base; 125, diamond friction rod separate moving base; 126, diamond friction rod overall moving base; 127, right limit rod group moving base; 128, swing base; 13, right clamping stretching assembly; 14, right stretching channel; 15, right yarn guide roller; 16, right fixed yarn weight slot. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] Embodiment 1:

[0042] like Figure 1 As shown, the present embodiment provides a yarn testing device for in-situ testing the strength and elongation properties of yarn after grinding, including a load-bearing panel 1, a tension weight slot 2, a left yarn guide roller 3, a left stretching channel 4, a left clamping and stretching assembly 5, a left tension test limit rod 6, a tension sensing assembly 7, a right tension test limit rod 8, a longitudinal pulling slot 9, a longitudinal pulling component 10, a yarn limit channel 11, a swinging friction assembly 12, a right clamping and stretching assembly 13, a right stretching channel 14, a right yarn guide roller 15 and a right fixed yarn weight slot 16.

[0043] The left clamping and stretching assembly 5 and the right clamping and stretching assembly 13 have the same structure. Figure 4As shown, it is composed of a spring valve 501, a fixed clamping plate 502, a movable clamping plate 503, a silicone clamping gasket 504, a slider base 505, a servo motor rotating shaft 506, a slot limiting plate 507 and a limiting slider 508. The spring valve 501 is located at the end of the slider base 505 away from the bearing panel 1, and is connected to the movable clamping plate 503 for clamping the yarn; the fixed clamping plate 502 is fixed on the slider base 505; the movable clamping plate 503 is located in the slider base 505; the slider base 505 is fixedly connected to the limiting slider 508; the slot limiting plate 507 is fixedly connected to the slider base 505 and installed in the left stretching channel 4, so that the slider base 505 can move left and right in the left stretching channel 4; the servo motor rotating shaft 506 is a worm, which cooperates with the internal thread of the limiting slider 508. When the servo motor rotating shaft 506 rotates When the yarn is stretched, the limit slider 508 is driven to move; the silicone clamping gasket 504 is fixed on the movable clamping plate 503, located between the movable clamping plate 503 and the fixed clamping plate 502, and is used to clamp the yarn. The movable clamping plate 503 and the fixed clamping plate 502 are between the yarn passing channel; the left clamping and stretching assembly 5 is used to clamp the front end of the yarn during the strong stretch test and translate the stretched yarn in the left stretching channel 4. In addition to clamping and stretching the yarn during the strong stretch test, the right clamping and stretching assembly 13 also fixes and clamps the rear end of the yarn during the wear resistance test and expands the friction range of the yarn by movement.

[0044] like Figure 5 As shown, the tension sensing assembly 7 is composed of a yarn guide pulley 701, a tension sensing element 702 and a support base 703, and together with the left tension test limit support rod 601, the left limit card slot 602, the right tension test limit support rod 801 and the right limit card slot 802, a tension testing module is formed to detect the tension of the yarn; the left limit card slot 602 is fixed on the left tension test limit support rod 601, the right limit card slot 802 is fixed on the right tension test limit support rod 801, and the left tension test limit support rod 601 and the right tension test limit support rod 801 are connected to each other. The test limit support rod 801 is fixed on the same horizontal plane of the bearing panel 1; the yarn guide pulley 701 is fixed on the tension sensor 702, and the pulley is provided with a groove for placing the yarn. The tension sensor 702 is fixed on the support base 703, which is used to test the tension of the yarn during the tensile test. The support base 703 is fixed on the bearing panel 1, and the yarn guide pulley 701 is located between the left tension test limit support rod 601 and the right tension test limit support rod 801, and above the left limit slot 602 and the right limit slot 802.

[0045] The longitudinal pulling component 10 is a smooth stainless steel rod, which is located in the longitudinal pulling groove 9 and is fixedly connected to the linear drive mechanism installed on the bearing panel 1. It can move vertically up and down in the longitudinal pulling groove 9 to apply a tensile load to the yarn to be tested, and at the same time, the yarn to be tested can be stretched to achieve the up and down rolling friction on the diamond friction roller 122 in the swing friction component 12;

[0046] like Figure 6 As shown, the swing friction assembly 12 is composed of a left limit rod 121, a diamond friction roller 122, a right limit rod 123, a front limit rod group moving base 124, a diamond friction rod individual moving base 125, a diamond friction rod overall moving base 126, a right limit rod group moving base 127 and a swing base 128. The left limit rod 121 is fixed to the front limit rod group moving base 124, the diamond friction roller 122 is fixed to the diamond friction rod individual moving base 125, the diamond friction rod individual moving base 125 is fixed to the diamond friction rod overall moving base 126, which are bases that can be adjusted individually, and each base is fixedly connected to a sand friction roller, and the right limit rod 123 is fixed to the right limit rod group moving base 127; the front limit rod group moving base 124, the diamond friction rod overall moving base 126, and the right limit rod group moving base 127 are fixed to the swing base 128, and the swing base 128 is fixed to the installation On the output shaft of the servo motor of the bearing panel 1; the left limit rod 121, the diamond grinding friction roller 122 and the right limit rod 123 can all be adjusted through the corresponding base position, so that the yarn forms a set precise encirclement angle on the diamond grinding friction roller 122, and gives the yarn a multi-dimensional friction load under the action of the swinging base 128 at a certain rate of swing; the position adjustment is through the long strip hole set on the base. When the position is adjusted, the screws are tightened to fix the position of the base. The diamond grinding friction roller 122 is fixed on a two-layer movable base. The purpose is to more accurately adjust the encirclement angle of the yarn bypassing the diamond grinding friction roller 122.

[0047] The yarn in the tension weight slot 2 is suspended with a small weight for applying pre-tension to the yarn, and the weight is suspended in the air, while one end of the yarn in the right fixed yarn weight slot 16 is fixed on a high-weight weight to stabilize one end of the yarn during the winding process.

[0048] The human-machine control panel 17 is placed at the top of the bearing panel 1, and is used to adjust the travel and operating speed of the longitudinal lifting component 10, the swing angle range and swing operating speed of the swing friction component 12, the moving stroke and speed of the left clamping and stretching component 5 and the right clamping and stretching component 13, as well as record the number of yarn wear resistance, breaking strength, and breaking elongation data.

[0049] Embodiment 2:

[0050] This embodiment provides a method for testing the abrasion resistance of yarns by in-situ testing the residual strength and elongation of yarns after abrasion using the device described in Embodiment 1. The method comprises the following steps:

[0051] S1: facing the instrument, first hang one end of the yarn around one end of the large gram weight used as a fixing, and place the weight in the right fixed yarn weight slot 16. After fixing, the yarn is hung and wound from back to front.

[0052] S2: holding the other end through the yarn feeding rear roller 15 and through the yarn passing channel of the right clamping and stretching assembly 13;

[0053] S3: Continue to hold the yarn and make it pass through the swing friction assembly 12, and form a set friction surrounding angle on the diamond grinding friction roller, such as Figure 3 As shown;

[0054] S4: Then, the yarn passes through the longitudinal pulling component 10, the right tension test limit rod 8, the tension sensing component 7, the right tension test limit rod 8, and the yarn passage of the left clamping component 5 in sequence, and finally passes through the left yarn feeding roller 3 for output, and the other end of the yarn is hung around the weight for applying pre-tension, and the weight is placed in the tension weight slot 2 in a suspended state, and it is confirmed that the yarn remains stable under the tension applied by the weight, and finally the spring valve 501 on the right clamping and stretching component 13 is fixed;

[0055] S5: adjusting the stroke and running speed of the longitudinal pulling component 10, the swing angle range and swing running speed of the swing friction component 12 through the human-machine control panel 17;

[0056] S6: Conduct yarn performance test. In the wear life test mode, the tension sensor component 7 starts the yarn break detection function. When the tension sensor component 7 detects that one of the yarns is worn out, the number of yarn breaks is displayed on the human-machine control panel 17. The instrument does not stop working until all ten yarns are worn out. In the attenuation mode test, first set a certain number of pre-friction times for the ten yarns according to the wear mode parameters in the above steps. After the pre-friction is completed, manually control the spring valve 501 to clamp the left clamping stretching component 5. At this time, both ends of the yarn are in a clamped and fixed state. Start the strong stretch test. The right clamping stretching component 13 moves horizontally in the right stretching channel and pulls the yarn toward the rear end until it breaks. During the breaking process, the human-machine control panel 17 records the base movement distance and the yarn tension value measured by the tension sensor 7.

[0057] S7: Record the data of the number of wear times, breaking strength and breaking elongation through the human-machine control panel 17.

[0058] The method of hanging yarn is as follows Figure 2 shown.

[0059] The strength loss rate and elongation change rate are used to comprehensively evaluate the performance of the yarn. The calculation method of strength loss rate and elongation change rate is as follows:

[0060]

[0061]

[0062] Among them, the initial breaking strength of the yarn is F 0 , the elongation at break is L 0 ; The breaking strength after pre-wear treatment is F, and the breaking elongation is L.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A yarn testing device for in-situ testing of the strength and elongation of yarn after abrasion. It is characterized in that It includes a load-bearing panel and a tension weight slot, a left yarn guide roller, a left stretching channel, a left clamping stretching assembly, a left tension test limit rod, a tension sensing assembly, a right tension test limit rod, a yarn limit channel, a swing friction assembly, a right clamping stretching assembly, a right stretching channel, a right yarn guide roller and a right fixed yarn weight slot which are sequentially located on the load-bearing panel; Among them, the left clamping and stretching assembly, the tension sensing assembly and the right clamping and stretching assembly are used to test the tensile strength of the yarn; The oscillating friction assembly is used to test the abrasion resistance of yarn; The left clamping and stretching assembly has the same structure as the right clamping and stretching assembly, and is composed of a spring valve, a fixed clamping plate, a movable clamping plate, a silicone clamping gasket, a slider base, a servo motor rotating shaft, a slot limit plate and a limit slider; the spring valve is located at the end of the slider base away from the bearing panel, and is connected to the movable clamping plate; the fixed clamping plate is fixed to the slider base; the movable clamping plate is located in the slider base; the slider base is fixedly connected to the limit slider; the slot limit plate is fixedly connected to the slider base and installed in the left stretching channel; the servo motor rotating shaft is a worm, which cooperates with the internal thread of the limit slider; the silicone clamping gasket is fixed to the movable clamping plate, and is located between the movable clamping plate and the fixed clamping plate; The tension sensing assembly is composed of a yarn guide pulley, a tension sensing element and a supporting base, and forms a tension testing module with a left tension test limit support rod, a left limit card slot, a right tension test limit support rod and a right limit card slot; the left limit card slot is fixed on the left tension test limit support rod, the right limit card slot is fixed on the right tension test limit support rod, and the left tension test limit support rod and the right tension test limit support rod are fixed on the same horizontal plane on the load-bearing panel; the yarn guide pulley is fixed on the tension sensing element, a groove is provided on the pulley, the tension sensing element is fixed to the supporting base, and the supporting base is fixed on the load-bearing panel; the yarn guide pulley is located between the left tension test limit support rod and the right tension test limit support rod, and above the left limit card slot and the right limit card slot; The swing friction assembly consists of a left limit rod, a diamond friction roller, a right limit rod, a front limit rod group moving base, a diamond friction rod separate moving base, a diamond friction rod overall moving base, a right limit rod group moving base and a swing base; the left limit rod is fixed to the front limit rod group moving base, the diamond friction roller is fixed to the diamond friction rod separate moving base, the diamond friction rod separate moving base is fixed to the diamond friction rod overall moving base, and they are bases that can adjust the front and rear positions individually, each base is fixedly connected to a sand friction roller, and the right limit rod is fixed to the right limit rod group moving base; the front limit rod group moving base, the diamond friction rod overall moving base, and the right limit rod group moving base are fixed to the swing base, and can adjust the front and rear positions respectively.

2. The yarn testing device for in-situ testing the strength and elongation properties of yarn after abrasion according to claim 1, It is characterized in that It also includes a longitudinal lifting component and a longitudinal lifting groove, which are located between the right tension test limit rod and the yarn limit channel. The longitudinal lifting component is a smooth stainless steel rod, which is located in the longitudinal lifting groove and is fixedly connected to a linear drive mechanism installed on the load-bearing panel, and can move vertically up and down in the longitudinal lifting groove.

3. The yarn testing device for in-situ testing the strength and elongation properties of yarn after abrasion according to claim 1, It is characterized in that The tension weight slot is used to hang weights with pre-tensioned gram weights, and the weights are suspended in the air.

4. The yarn testing device for in-situ testing the strength and elongation properties of yarn after abrasion according to claim 1, It is characterized in that The right weight slot is used to hang a high-weight weight to stabilize one end of the yarn during the winding process.

5. The yarn testing device for in-situ testing the strength and elongation properties of yarn after abrasion according to claim 1, It is characterized in that The human-machine control panel is placed on the top of the load-bearing panel, and is used to adjust the travel and operating speed of the longitudinal lifting component, the swing angle range and swing operating speed of the swing friction component, the moving travel and speed of the left clamping and stretching component and the right clamping and stretching component, and to record the number of yarn wear resistance, breaking strength, and breaking elongation data.

6. A method for testing the abrasion resistance of yarns by in-situ testing the residual strength and elongation of yarns after abrasion using the device according to any one of claims 1 to 5, It is characterized in that The method comprises the following steps: S1: First, hang one end of the yarn on the weight in the right fixed yarn weight slot, and the weight is placed at the bottom of the rear weight slot. After the weight is fixed, the yarn is hung from the back to the front; S2: hold the other end through the yarn feeding rear roller and through the right clamping stretching assembly; S3: Continue to hold the yarn and pass it through the swinging friction assembly; S4: Then the yarn passes through the longitudinal pulling component, the right tension test limit rod, the tension sensing component, the right tension test limit rod, and the yarn passing channel of the left clamping component in sequence, and finally passes through the left yarn feeding roller for output, and the other end of the yarn is hung on the weight for applying pre-tension provided in the tension weight slot, and the weight is placed in the tension weight slot in a suspended state, and it is confirmed that the yarn remains stable under the tension applied by the weight, and finally the clamping component on the right clamping stretching component is fixed; S5: adjusting the stroke and running speed of the longitudinal lifting component, the swing angle range and swing running speed of the swing friction component through the human-machine control panel; S6: Conduct yarn performance test. In the wear life test mode, the tension sensor component starts the yarn break detection function. When the tension sensor component detects that one of the yarns is worn out, the number of yarn breaks is displayed on the human-machine control panel, and the instrument does not stop working until all ten yarns are worn out. In the attenuation mode test, first set a certain number of pre-friction times for the ten yarns according to the wear mode parameters in the above steps. After the pre-friction is completed, the left clamping and stretching component is controlled to be clamped. At this time, both ends of the yarn are in a clamped and fixed state. Start the strong stretch test. The right clamping and stretching component moves horizontally in the right stretching channel and pulls the yarn toward the rear end until it breaks. During the breaking process, the human-machine control panel records the base movement distance and the yarn tension value measured by the tension sensor. S7: Record the data of wear times, breaking strength and breaking elongation through the human-machine control panel.

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