High-speed carbon fiber wear resistance testing device and testing method thereof

Abstract

The invention discloses a high-speed carbon fiber wear resistance testing device and a testing method thereof, and belongs to the technical field of carbon fiber wear resistance testing, the high-speed carbon fiber wear resistance testing device comprises a first movement mechanism and a second movement mechanism which move in a criss-cross manner; a plurality of friction rods which are distributed in parallel at intervals are arranged on the first movement mechanism; the second movement mechanism is provided with two yarn end clamps for clamping and connecting the two ends of the yarn to be subjected to friction test, the yarn end clamps are connected with a yarn adjusting and triggering assembly, and the friction rod is located between the two yarn end clamps and is configured to be in friction contact with the yarn to be subjected to friction test clamped by the two yarn end clamps. According to the high-speed carbon fiber wear resistance testing device and the testing method thereof disclosed by the invention, the performance test of yarns under multiple working conditions is realized, the speed is adjustable, and the testing speed and the testing efficiency are improved.

Description

Technical Field

[0001] This invention belongs to the field of carbon fiber abrasion resistance testing technology, specifically relating to a high-speed carbon fiber abrasion resistance testing device and its testing method. Background Technology

[0002] Fabric wear is a complex process involving multiple factors, and the degree of wear is difficult to assess using a single indicator. However, since the abrasion resistance and durability of a fabric mainly depend on the yarn composition, abrasion resistance properties of the yarn, and finishing processes, researching and measuring the abrasion resistance of yarn is of significant practical importance for predicting the wearing characteristics and abrasion resistance of textile products, improving yarn production processes, and enhancing yarn product quality and sizing effects.

[0003] The abrasion resistance of yarn is a crucial criterion for judging its quality. To avoid producing low-quality, easily damaged products, testing the abrasion resistance of yarn is essential. Existing yarn abrasion resistance tests are based on the abrasion life of the yarn when rubbed against external objects. Currently, the most common testing equipment on the market is the yarn abrasion tester. This equipment can only achieve unidirectional reciprocating friction motion, and its automation and integration levels are low, resulting in poor comparability and reproducibility of test results, failing to meet market demands. In actual fiber applications, multi-directional friction often occurs simultaneously. Therefore, a solution is needed to address the market's need for multi-directional, rapid, and accurate testing of yarn abrasion resistance. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-speed carbon fiber wear resistance testing device and its testing method. This invention solves the technical problem of wear resistance testing of carbon fiber under complex working conditions and greatly improves the testing speed. It can achieve high-speed movement, adjustable friction speed, and real-time monitoring of friction count, thus enriching the testing methods and improving the testing efficiency.

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution: In a first aspect, the present invention provides a high-speed carbon fiber abrasion resistance testing device, comprising: The first and second motion mechanisms move in a crisscross pattern; the speed of the first and second motion mechanisms is adjusted by a speed regulating mechanism, and they can achieve rapid cyclic reciprocating motion within a short stroke.

[0006] The first motion mechanism is equipped with several friction rods that are arranged in parallel and spaced apart. The second motion mechanism is equipped with two yarn end clamps and yarn end clamps for clamping the yarn to be tested at both ends. A yarn adjustment and triggering component is connected to the yarn end clamps. The friction rod is located between the two yarn end clamps and is configured to make frictional contact with the yarn to be tested clamped by the two yarn end clamps.

[0007] The speed regulation mechanism is achieved by a motor and a frequency converter; in conjunction with the crank-slider structure, it enables rapid cyclic reciprocating motion within a short stroke. The motor is connected to a reduction gearbox, and the output shaft of the reduction gearbox is connected to a rotating wheel via a key, driving the rotating wheel to rotate. The rotating wheel is connected to a spherical bearing via a connecting piece, and the spherical bearing is connected to the spherical bearing via a connecting rod. The spherical bearing is connected to the slider via a connecting piece, thereby driving the slider to move back and forth. The slider is fixedly connected to the axial motion platform connecting plate, and the axial motion platform connecting plate is connected to the axial motion platform, thereby driving the axial motion platform to move back and forth. To limit the back-and-forth movement of the axial motion platform to horizontal linear motion, linear bearings are fixedly installed on the left and right transmission mounting plates. The guide shaft moves linearly along the axial direction of the linear bearing, driving the slider to move left and right linearly, thus limiting the axial motion platform to horizontal linear motion.

[0008] Furthermore, the second motion mechanism includes: Second sports platform, The second motion platform has a first guide shaft that extends upward and is fitted with a first linear bearing at each end; the top ends of the two first guide shafts are fixedly connected to a corresponding yarn end clamp, and at least one first guide shaft has a clamp seat fixedly connected to its top end. The clamp seat is equipped with a guide rail that is laterally arranged along the connection direction between the two yarn end clamps, and the yarn end clamp is laterally slidably connected to the guide rail.

[0009] Furthermore, a second guide shaft is connected to the middle of the second motion platform. The second guide shaft is sleeved on a second linear bearing, which is fixedly mounted on a mounting plate.

[0010] Furthermore, the yarn adjustment and triggering component includes a metal wire, a fixed pulley, a shaped weight, and a first photoelectric sensor; One end of the metal wire is fixedly connected to the yarn end clamp disposed on the clamp seat, and the other end of the metal wire is fixedly connected to the opposite-shaped weight after passing through a fixed pulley; The first photoelectric sensor is disposed on one side of the clamp seat and located in the stretching direction of the metal wire, and can cause the metal wire to move the yarn end clamp to slide laterally to trigger the first photoelectric sensor.

[0011] The second photoelectric sensor is disposed on the upper and lower transmission mounting plate and can be triggered by the longitudinal sliding of the second motion platform.

[0012] The third photoelectric sensor is mounted on the left and right transmission mounting plate and can be triggered by the lateral sliding of the first motion platform.

[0013] Furthermore, the first motion mechanism includes a first motion platform that is driven by a speed regulating mechanism to reciprocate laterally.

[0014] Furthermore, the friction rod is set at a perpendicular or inclined angle relative to the line connecting the two yarn end clamps, with the angle ranging from 0 to 116°.

[0015] Furthermore, the testing device also includes a test chamber, a test cover, and a touch screen; The test chamber is assembled from steel plates and accessories. A support is installed at the bottom of the test chamber and a level is installed at the top to ensure the levelness and stability of the entire test mechanism. The test cover is made of transparent material, and the touch screen is connected to the peripheral electrical equipment and PLC.

[0016] Furthermore, the mounting plate is provided with a speed regulating mechanism for driving the first motion mechanism and the second motion mechanism.

[0017] In a second aspect, the present invention provides a testing method for a high-speed carbon fiber abrasion resistance testing device as described in any one of the first aspects, comprising the following steps: The yarn to be tested for friction is clamped and fixed between the yarn end clamps on both sides of the second motion platform. The yarn tension is adjusted by adjusting the irregular weight connected to the metal wire on one side of the clamp seat and pulling the yarn end clamp by the metal wire. Several friction bars are detachably set on the first motion platform in parallel intervals so that the friction bars come into frictional contact with the yarn, and the angle between the friction bars and the yarn is adjusted according to the preset friction test performance requirements. Select the friction operation mode, set the operating parameters of the first and second motion mechanisms, including the friction speed under different operating modes, and the friction speed, friction count, and operating status can be displayed on the touch screen in real time; The test is initiated, and the number of reciprocating motions of the second motion platform is detected using the second photoelectric sensor, while the number of reciprocating motions of the first motion platform is detected using the third photoelectric sensor. The test stops when the set number of friction cycles is reached, or when the metal ribbon moves the yarn end clamp to slide laterally, triggering the photoelectric sensor, the test stops due to the broken yarn.

[0018] Furthermore, different friction operating conditions include: In the first friction operation mode, the yarn to be tested on the second motion platform remains fixed, and the first motion platform drives the friction bar to perform reciprocating cyclic motion relative to the yarn. In the second friction operation mode, the friction bar of the first motion platform is fixed, while the yarn to be tested on the second motion platform performs reciprocating cyclic motion. In the third friction operation mode, the friction rod on the first motion platform and the test yarn on the second motion platform reciprocate in a cyclical motion.

[0019] Compared with existing technologies, the beneficial effects achieved by this invention are as follows: The high-speed carbon fiber wear resistance testing device and method provided by this invention solve the technical problem of wear resistance testing of carbon fiber under complex working conditions; and greatly improves the testing speed, enabling high-speed movement. The friction speed is adjustable and the number of friction cycles can be monitored in real time, enriching testing methods and improving testing efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a high-speed carbon fiber abrasion resistance testing device provided in an embodiment of the present invention.

[0021] Figure 2 This is a three-dimensional schematic diagram of a second motion mechanism provided in an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the appearance of a testing device provided in an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of a speed regulating mechanism provided in an embodiment of the present invention.

[0024] In the diagram: 1. Irregularly shaped weight; 2. Fixed pulley; 3. Metal wire; 4. Left yarn end clamp; 5. Yarn; 6. Friction rod; 7. Right yarn end clamp; 8. First motion platform; 9. Clamp seat; 21. Box body; 22. Protective cover; 23. Touch screen; 211. Upper platform of the test box; 24. Second motion platform; 25. First guide shaft; 26. First linear bearing; 27. Second guide shaft; 28. Second linear bearing; 29. ​​Upper and lower transmission mounting plate; 31. Rotary wheel; 32. Joint bearing; 33. Connecting rod; 34. Joint bearing; 35. Slider; 36. Axial motion platform connecting plate; 37. Third linear bearing; 38. Third guide shaft; 39. Left and right transmission mounting plate; 41. First photoelectric sensor; 42. Second photoelectric sensor; 43. Third photoelectric sensor. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] refer to Figure 1 , Figure 2 and Figure 3 As shown, this embodiment of the invention provides a high-speed carbon fiber abrasion resistance testing device, including a first motion mechanism and a second motion mechanism that move in a crisscross pattern. The first motion mechanism is equipped with several parallel and spaced friction rods 6; The second motion mechanism is equipped with two yarn end clamps and a yarn end clamp for clamping the yarn 5 to be tested at both ends. A yarn 5 adjustment and triggering component is connected to each yarn end clamp. A friction rod 6 is located between the two yarn end clamps and configured to make frictional contact with the yarn 5 clamped by the two clamps. The abrasion resistance of the yarn 5 is tested through friction between the friction rod 6 and the yarn 5. This solves the technical problem of abrasion resistance testing under complex working conditions of carbon fiber and greatly improves the testing speed, enabling high-speed motion. The friction speed is adjustable, and the number of friction cycles can be monitored in real time, enriching the testing methods and improving testing efficiency. Simultaneously, the adjustable speed motion overcomes the shortcomings of low-speed testing currently on the market, enriching the testing methods and improving testing efficiency.

[0029] The second motion mechanism includes a second motion platform 24. At each end of the second motion platform 24, there is a first guide shaft 25 that extends upward and is fitted with a first linear bearing 26. The top ends of the two first guide shafts 25 are fixedly connected to a corresponding yarn end clamp, and at least one first guide shaft 25 is fixedly connected to a clamp seat 9. The clamp seat 9 is equipped with a guide rail that is laterally arranged along the connection direction between the two yarn end clamps. The yarn end clamp is laterally slidably connected to the guide rail.

[0030] The first linear bearing 26 can be fixedly mounted on the test chamber and slide relative to the first guide shaft 25.

[0031] In some embodiments, four first guide shafts 25 are fixedly connected above the second motion platform 24. The first guide shafts 25 pass through the first linear bearings 26. The four first linear bearings 26 are fixedly connected to the test chamber. The four first guide shafts 25 reciprocate with the second motion platform 24.

[0032] For example, two first guide shafts 25 are configured on the left side of the second motion platform 24 and are fixedly connected to the left end clamp seat 9. The left yarn end clamp 4 moves up and down with the left end clamp seat 9. At the same time, two first guide shafts 25 on the right side are fixedly connected to the right yarn end clamp 7, and the right yarn end clamp 7 moves up and down accordingly. Since all four first guide shafts 25 are fixedly connected to the up and down motion platform, the four first guide shafts 25 move synchronously, which ensures that the yarn end clamps on both sides move up and down synchronously.

[0033] A second guide shaft 27 is connected to the middle of the second motion platform 24. The second guide shaft 27 is sleeved on a second linear bearing 28. The second linear bearing 28 is fixedly mounted on a mounting plate. A speed regulating mechanism for driving the reciprocating motion of the second guide shaft 27 is provided on the mounting plate.

[0034] The second linear bearing 28 can be fixedly mounted on the test chamber and slide relative to the second guide shaft 27.

[0035] The speed regulation mechanism is achieved by a motor and a frequency converter; in conjunction with the crank-slider structure, it enables rapid cyclic reciprocating motion within a short stroke. The motor is connected to a gearbox, and the output shaft of the gearbox is connected to a rotating wheel 31 via a key, driving the rotating wheel to rotate. The rotating wheel is connected to a spherical bearing 32 via a connecting piece, and the spherical bearing 32 is connected to a spherical bearing 34 via a connecting rod 33. The spherical bearing 34 is connected to a slider 35 via a connecting piece, thereby driving the slider 35 to move back and forth. The slider 35 is fixedly connected to the axial motion platform connecting plate 36, which is connected to the axial motion platform 8, thereby driving the axial motion platform 8 to move back and forth. To limit the back and forth movement of the axial motion platform 8 to horizontal linear motion, a linear bearing 37 is fixedly installed on the left and right transmission mounting plate 39. The guide shaft 38 moves linearly along the axial direction of the linear bearing 37, driving the slider to move left and right linearly, thus limiting the axial motion platform 8 to horizontal linear motion.

[0036] In this embodiment, speed control is achieved using a power speed regulation system. By employing linear reciprocating sliding guide technology, guide rail sliders are used for left and right movement, and linear bearings are used for up and down movement. This reduces frictional resistance, enables continuous reciprocating motion with flexible guidance, reduces motor load, and extends motor service life.

[0037] The yarn 5 adjustment and triggering assembly includes a metal wire 3, a fixed pulley 2, an irregularly shaped weight 1, and a first photoelectric sensor; One end of the metal wire 3 is fixedly connected to a yarn end clamp mounted on the clamp seat 9, and the other end of the metal wire 3 is fixedly connected to a weight of a different shape after passing through a fixed pulley 2. A first photoelectric sensor is disposed on one side of the clamp seat 9 and located in the stretching direction of the metal wire 3, and can cause the metal wire 3 to drive the yarn end clamp to slide laterally to trigger the first photoelectric sensor. A second photoelectric sensor is disposed on the upper and lower transmission mounting plates, and can cause the second motion platform to slide longitudinally to trigger the second photoelectric sensor. A third photoelectric sensor is disposed on the left and right transmission mounting plates, and can cause the first motion platform to slide laterally to trigger the third photoelectric sensor.

[0038] When yarn 5 breaks due to friction, under the tension of the irregular weight 1, the yarn end clamp on the left side is pulled by the metal wire 3. The yarn end clamp on the left side moves to the left along the guide rail of the left end clamp seat 9, thereby triggering the first photoelectric sensor. At this time, the counting stops, and the touch screen displays the number of abrasion resistance times of yarn 5.

[0039] The first motion mechanism includes a first motion platform 8 that is driven by a speed regulating mechanism to reciprocate laterally. The first motion platform 8 is driven by the speed regulating mechanism, which is located inside the housing or on the mounting plate.

[0040] The friction rod 6 is set at a perpendicular or inclined angle relative to the line connecting the two yarn end clamps, with the angle ranging from 0 to 116°.

[0041] In some embodiments, the testing apparatus further includes a test chamber, a test cover, and a touch screen.

[0042] The test chamber is assembled from steel plates and accessories. A support is installed at the bottom of the chamber, and a level is mounted on top to ensure the levelness and stability of the entire testing mechanism. The test cover is made of transparent material, and the touchscreen connects to the external electrical equipment and PLC. An integrated test interface, signal acquisition, and output control are developed through an HMI interface, enabling real-time monitoring of key parameters such as stopping method, friction speed, number of friction cycles, and operating status, thus improving experimental efficiency and safety.

[0043] In a second aspect, the present invention provides a testing method for a high-speed carbon fiber abrasion resistance testing device as described in any of the first aspects, comprising the following steps: The yarn 5 to be tested for friction is clamped and fixed between the yarn end clamps on both sides of the second motion platform 24. The tension of the yarn 5 is adjusted by adjusting the irregular weight 1 connected to the metal wire 3 on one side of the clamp seat 9 and pulling the yarn end clamp by the metal wire 3. Several friction rods 6 are detachably arranged in parallel intervals on the first motion platform 8 so that the friction rods 6 come into frictional contact with the yarn 5, and the angle between the friction rods and the yarn is adjusted according to the preset friction test performance requirements. According to the preset friction operation mode, the operating parameters of the first motion mechanism and the second motion mechanism are set, including the friction speed under different operating conditions. The friction speed, friction count, and operating status can be displayed on the touch screen in real time. Start the test and use the second photoelectric sensor to detect the number of reciprocating motions of the second motion platform 24; The test stops when the set number of friction cycles is reached, or when the metal wire 3 drives the yarn end clamp to slide laterally, triggering the first photoelectric sensor, the test stops due to the broken wire.

[0044] In some embodiments, different friction operating conditions include: In the first friction operation mode, the yarn 5 to be tested on the second motion platform 24 remains fixed, and the first motion platform 8 drives the friction rod 6 to perform reciprocating cyclic motion relative to the yarn 5. In the second friction operation mode, the friction rod 6 of the first motion platform 8 is fixed, while the yarn 5 to be tested on the second motion platform 24 performs reciprocating cyclic motion. In the third friction operation mode, the friction rod 6 on the first motion platform 8 and the test yarn to be rubbed on the second motion platform 24 reciprocate in a circular motion simultaneously.

[0045] In this embodiment, the speed adjustment range is 25-360 revolutions / minute, the angle adjustment range is 0-116, and the friction stroke is 30mm or 35mm (adjustable).

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-speed carbon fiber abrasion resistance testing device, characterized in that, include: The first and second motion mechanisms move in a crisscrossing manner; The first motion mechanism is equipped with several friction rods that are arranged in parallel and spaced apart. The second motion mechanism is equipped with two yarn end clamps and yarn end clamps for clamping the yarn to be tested at both ends. A yarn adjustment and triggering component is connected to the yarn end clamps. The friction rod is located between the two yarn end clamps and is configured to make frictional contact with the yarn to be tested clamped by the two yarn end clamps.

2. The high-speed carbon fiber abrasion resistance testing device according to claim 1, characterized in that, The second motion mechanism includes: Second sports platform, The second motion platform has a first guide shaft that extends upward and is fitted with a first linear bearing at each end; the top ends of the two first guide shafts are fixedly connected to a corresponding yarn end clamp, and at least one first guide shaft has a clamp seat fixedly connected to its top end. The clamp seat is equipped with a guide rail that is laterally arranged along the connection direction between the two yarn end clamps, and the yarn end clamp is laterally slidably connected to the guide rail.

3. The high-speed carbon fiber abrasion resistance testing device according to claim 2, characterized in that, A second guide shaft is connected to the middle of the second motion platform. The second guide shaft is sleeved on a second linear bearing, which is fixedly mounted on a mounting plate.

4. The high-speed carbon fiber abrasion resistance testing device according to claim 2 or 3, characterized in that, The yarn adjustment and triggering component includes a metal wire, a fixed pulley, a shaped weight, and a first photoelectric sensor; One end of the metal wire is fixedly connected to the yarn end clamp disposed on the clamp seat, and the other end of the metal wire is fixedly connected to the opposite-shaped weight after passing through a fixed pulley; The first photoelectric sensor is disposed on one side of the clamp seat and located in the stretching direction of the metal wire, and can cause the metal wire to move the yarn end clamp to slide laterally to trigger the first photoelectric sensor.

5. The high-speed carbon fiber abrasion resistance testing device according to claim 1, characterized in that, The first motion mechanism includes a first motion platform that is driven by a speed regulating mechanism to reciprocate laterally; The speed regulation mechanism is achieved by a motor and a frequency converter, which, together with the crank-slider structure, enables rapid cyclic reciprocating motion within a short stroke. The motor is connected to a reduction gearbox, and the output shaft of the reduction gearbox is connected to a rotating wheel via a key, which drives the rotating wheel to rotate. The rotating wheel is connected to the slider via a spherical bearing, thereby driving the slider to move back and forth. The slider is fixedly connected to the axial motion platform connecting plate, which is configured to connect to either the first motion platform or the second motion platform. The slider is connected to the third guide shaft along the axial direction of movement. The third guide shaft passes through the third linear bearing along the axial direction of movement to make left and right linear movements. The third linear bearing is fixedly installed on the left and right transmission mounting plate.

6. The high-speed carbon fiber abrasion resistance testing device according to claim 5, characterized in that, The friction bar is set at a perpendicular or inclined angle relative to the line connecting the two yarn end clamps, with the angle ranging from 0 to 116°.

7. The high-speed carbon fiber abrasion resistance testing device according to claim 1, characterized in that, The testing device also includes a test chamber, a test cover, and a touch screen; The test chamber is assembled from steel plates and accessories. A support is installed at the bottom of the test chamber and a level is installed at the top to ensure the levelness and stability of the entire test mechanism. The test cover is made of transparent material, and the touch screen is connected to the peripheral electrical equipment and PLC.

8. The high-speed carbon fiber abrasion resistance testing device according to claim 3, characterized in that, The mounting plate is provided with a speed regulating mechanism for driving the first motion mechanism and the second motion mechanism.

9. A test method for the high-speed carbon fiber abrasion resistance testing device as described in any one of claims 1 to 8, characterized in that, Includes the following steps: The yarn to be tested for friction is clamped and fixed between the yarn end clamps on both sides of the second motion platform. The yarn tension is adjusted by adjusting the irregular weight connected to the metal wire on one side of the clamp seat and pulling the yarn end clamp by the metal wire. Several friction bars are detachably set on the first motion platform in parallel intervals so that the friction bars come into frictional contact with the yarn, and the angle between the friction bars and the yarn is adjusted according to the preset friction test performance requirements. According to the preset friction operation mode, the operating parameters of the first motion mechanism and the second motion mechanism are set, including the friction speed under different operating conditions. The friction speed, friction count, and operating status can be displayed on the touch screen in real time. The test is initiated, and the number of reciprocating motions of the second motion platform is detected using the second photoelectric sensor, while the number of reciprocating motions of the first motion platform is detected using the third photoelectric sensor. The test stops when the set number of friction cycles is reached, or when the metal ribbon moves the yarn end clamp to slide laterally, triggering the first photoelectric sensor, the wire breakage stops.

10. The method for testing the wear resistance of high-speed carbon fiber according to claim 9, characterized in that, Different friction operating conditions include: In the first friction operation mode, the yarn to be tested on the second motion platform remains fixed, and the first motion platform drives the friction bar to perform reciprocating cyclic motion relative to the yarn. In the second friction operation mode, the friction bar of the first motion platform is fixed, while the yarn to be tested on the second motion platform performs reciprocating cyclic motion. In the third friction operation mode, the friction rod on the first motion platform and the test yarn on the second motion platform reciprocate in a cyclical motion.

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