Colored spun yarn friction detection device and detection method

Abstract

The invention relates to a colored spun yarn friction detection device and method, and belongs to the technical field of detection.The device comprises a base, a clamp I, a clamp II and a tension adjusting mechanism are arranged on the base, the tension adjusting mechanism keeps yarn tension constant through the gravity of a balancing weight, and a sliding plate is slidably arranged on a supporting base I at the top of the base; a motor on a supporting seat II drives a sliding plate to reciprocate, a friction mechanism is arranged on one side of the sliding plate in a liftable mode, a driving motor of the friction mechanism drives a plurality of friction wheels to rotate around the axis of yarn, and multidirectional dynamic friction detection is achieved. A micro-wet water film is formed by utilizing capillary seepage, a sweat environment is accurately simulated, the clamps I and II are adaptive to yarns with different diameters, targeted detection of crossed yarns and knitting knots can be realized, and the problems of friction scene simulation distortion, insufficient wet state detection accuracy and the like of an existing device are solved.

Description

Technical Field

[0001] This invention belongs to the field of detection technology and relates to a device and method for detecting friction in colored spun yarn. Background Technology

[0002] Colored yarn, with its unique color mixing effect and good wearability, is widely used in clothing, home textiles, decoration and other fields. Its friction properties (including abrasion resistance, color fastness and so on) directly affect the service life and appearance stability of the end products. Therefore, the friction properties of colored yarn must be strictly controlled by professional testing equipment during the production process.

[0003] Currently, the friction testing devices for colored yarns on the market mainly consist of a base, a clamping mechanism, a friction actuator, and a drive component. Their core working principle involves fixing both ends of the yarn using the clamping mechanism, and then using a motor to drive a friction wheel to generate relative friction with the yarn. The friction performance is then judged by observing the wear and color fading of the yarn after friction. However, existing testing devices have many shortcomings in practical applications and cannot meet the needs for accurate and comprehensive testing. The friction wheels in existing devices mostly move in one direction or along a fixed trajectory, which can only detect friction in a single direction and at a single position of the yarn. They cannot replicate the multi-directional and dynamic friction experienced by the yarn during actual wear and use, and the test results cannot truly reflect the abrasion resistance of the yarn in actual use.

[0004] When a person wears clothing made of colored yarn, sweat causes the yarn surface to become slightly damp. The frictional properties under this environment are significantly different from those under dry conditions. However, existing devices that simulate wet friction often use methods such as spraying water or directly immersing the yarn in liquid, resulting in the yarn being over-wetted. This completely deviates from the real scenario of "slightly damp surface and dry interior" under the action of human sweat. As a result, it is impossible to accurately detect the color fastness and abrasion resistance of the yarn under sweat conditions, and the reference value of the test data is limited.

[0005] Therefore, a device and method for detecting friction in colored spun yarn are proposed to solve the problems mentioned above. Summary of the Invention

[0006] This invention addresses the pain points of friction performance testing technology in practical applications of colored yarn, namely, that traditional devices mostly perform friction in a single direction, failing to simulate the multi-directional dynamic effects during wear; wet simulations result in excessive wetting, which does not match the slightly damp environment of sweat; and the lack of targeted detection at cross knots leads to data distortion. To solve these problems, this invention starts by replicating a real-world scenario, designing a mechanism where multiple friction wheels rotate around the yarn, and selecting a transmission between a rotating ring and a toothed ring to achieve multi-directional contact. Simultaneously, a friction wheel receiving cavity and a screw are introduced to compress seepage, controlling a small amount of even seepage to form a surface film layer, reducing human spraying errors and improving test consistency.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a colored yarn friction detection device, comprising: a base, a clamp I slidably disposed on the top of the base, and a clamp II fixedly disposed on the top of the base, wherein the clamp I and the clamp II cooperate to clamp the two ends of the colored yarn; The tension adjustment mechanism is fixed to the top of the base and located on one side of the clamp I, and is used to drive the clamp I to move to tighten the colored yarn. Support base II, which is fixed to the top of the base, and a motor is fixed to one side of it; Support base I, which is fixed to the top of the base, has a sliding plate slidably disposed on one side of it, and the output end of the motor is connected to the sliding plate to drive the sliding plate to reciprocate; The friction mechanism is elliptical and mounted on one side of the slide plate. It includes multiple friction wheels I and II and a drive motor. The drive motor drives the multiple friction wheels I and II to rotate around the axis of the colored yarn, thereby realizing multi-directional friction detection of the yarn.

[0008] As a further improvement to the above technical solution: The friction mechanism also includes a fixed ring, a rotating ring, and a mounting base. The fixed ring is vertically connected to the slide plate. The rotating ring is rotatably embedded in the fixed ring. The mounting base is fixed in the rotating ring. Multiple friction wheels I and friction wheels II are mounted on the top of the mounting base, and their outer walls are provided with grooves that are compatible with the yarn. A toothed ring is fixedly sleeved on the outer wall of the rotating ring, and a cover plate is fixed on one side of the fixed ring. The drive motor is fixed to the cover plate, and a gear that meshes with the toothed ring is fixed at its output end. The drive motor drives the rotating ring to rotate through gear-toothed ring transmission.

[0009] A rotating seat is fixed on one side of the slide plate, and a stud is rotatably installed through the rotating seat. A lifting seat is slidably installed on one side of the slide plate, and a nut is fixed inside the lifting seat. The nut is threadedly engaged with the stud. The fixing ring is fixed on the side of the lifting seat away from the slide plate. Rotating the stud can drive the lifting seat to move the friction mechanism up and down.

[0010] The motor output end is fixed with a drive disk, and a drive rod is rotatably connected to the edge of the drive disk away from the motor. The other end of the drive rod is rotatably connected to the slide plate. When the motor drives the drive disk to rotate, it pulls the slide plate along the support seat I through the drive rod, thereby driving the friction mechanism to detect friction at different positions of the yarn.

[0011] A rectangular hole is provided on one side of the mounting base. Two parallel guide rods are fixed in the rectangular hole. A lever is slidably sleeved on the outer wall of the guide rod. A spring is sleeved on the guide rod. The two ends of the spring abut against the lever and the inner wall of the rectangular hole, respectively. Multiple friction wheels I are divided into two groups. One group is rotatably connected to the mounting base via a rotating shaft, and the other group of friction wheels I and friction wheels II are rotatably connected to the lever via a rotating shaft. The top of the mounting base is provided with a waist-shaped hole that matches the rotating shaft. The lever can slide along the guide rod to adjust the distance between the friction wheels and adapt to yarns of different diameters.

[0012] The friction wheel II has a receiving cavity at its top, and a sealing cap is threaded to the top of the receiving cavity. A diaphragm located inside the receiving cavity is fixed to the bottom of the sealing cap. A connecting cylinder is fixed to one side of the sealing cap, and a screw is threaded through the connecting cylinder. A piston head is rotatably connected to one end of the screw. Both the fixed ring and the rotating ring have rectangular openings at their tops that correspond to the receiving cavity. The test medium is injected into the receiving cavity through the rectangular openings. Rotating the screw pushes the piston head to squeeze the diaphragm, controlling the medium seepage rate to simulate a wet friction environment.

[0013] The clamp I includes a clamp base plate, a pressure plate I and a screw I. The clamp base plate is slidably connected to the top of the base, and its top has two clamping grooves I and one clamping groove II, with the clamping groove II located between the two clamping grooves I. The pressure plate I is placed in the clamping groove I and the clamping groove II respectively. The screw I passes through the pressure plate I and is threadedly connected to the base plate of the fixture. Tightening the screw I can make the pressure plate I press and fix the yarn.

[0014] The tension adjustment mechanism includes a support frame, two guide wheels, a pull rope, and a counterweight. The support frame is fixed to the top of the base, and the two guide wheels are respectively rotatably installed on the top of the support frame and on the side near the clamp I. One end of the pull rope is fixed to the base plate of the clamp, and the other end passes over two guide wheels and is fixed to the counterweight. A vertical guide rail is fixed on the side of the support frame away from the clamp I. The counterweight slides with the vertical guide rail. The clamp I is pulled by the gravity of the counterweight to maintain constant yarn tension.

[0015] The clamp II includes a fixed base, two sliding blocks, a pressure plate II and a screw II. The fixed base is fixed to the top of the base, and two parallel rectangular slots are opened on one side of it. The sliding blocks are slidably embedded in the rectangular slots respectively. A positioning post is fixed on one side of both the slide and the fixed seat. The pressure plate II is sleeved on the outer wall of the positioning post. The screw II passes through the pressure plate II and is threadedly connected to the slide and the fixed seat respectively. The fixed base is rotatably provided with a swing rod on the other side, with openings at both ends. An extension column is fixed on one side of the slide block, and the extension column is slidably locked in the opening. A rotating rod I is rotatably sleeved on the top extension column, and a rotating rod II is slidably sleeved on the rotating rod I. The rotating rod II is rotatably connected to the slide plate. A bolt is provided on one side of the rotating rod II, and the end of the bolt abuts against the rotating rod I to fix the relative positions of the two. When the slide plate moves, it can drive the slide block to move synchronously, realizing the friction detection of cross yarns.

[0016] A method for detecting friction in spun yarn, using the aforementioned spun yarn friction detection device, includes the following steps: S1: Select a counterweight according to the test requirements, place one end of the colored yarn in the groove of clamp I, and tighten screw I to fix it through pressure plate I; S2: Pull the lever to move a set of friction wheels I and II outward, placing the middle of the yarn between the two sets of friction wheels. Release the lever, and the spring pushes the lever to make the friction wheels clamp the yarn. The other end of the yarn is fixed by the pressure plate II and screw II of the clamp II. S3: Start the motor and drive motor. The motor drives the friction mechanism to move back and forth, and the drive motor drives the friction wheel to rotate around the yarn to complete the dry friction detection. S4: If wet testing is required, inject the test medium into the receiving cavity of friction wheel II through the rectangular opening, rotate the screw to adjust the medium seepage rate, and repeat S3 to complete the wet friction test; S5: To test the abrasion resistance of the yarn knot, fix one yarn to the two clamping slots I of clamp I, and cross the other yarn through and fix it to the two sliding blocks of clamp II. Fix rotating rod I and rotating rod II, start the motor to drive the sliding blocks to move, and complete the knot test.

[0017] The beneficial effects of this invention are as follows: 1. The present invention discloses a yarn friction detection device, wherein the friction mechanism drives multiple friction wheels to rotate around the yarn axis by a drive motor, and at the same time the motor drives the slide plate to move the friction mechanism back and forth, so as to realize multi-directional and dynamic friction detection of the yarn and replicate the friction state of the yarn in actual use; the arc groove on the outer wall of the friction wheel is adapted to yarns of different diameters, and the elastic cooperation between the lever and the spring can automatically adjust the contact pressure between the friction wheel and the yarn to ensure uniform and stable contact, and is suitable for the detection needs of yarns of various materials such as cotton, chemical fiber, and blended yarns; 2. The yarn friction testing device disclosed in this invention uses a friction wheel II made of sintered porous ceramic with a specific microporosity. Combined with a receiving cavity, a diaphragm, and a piston head structure driven by a screw, it forms a uniform, non-flowing micro-wet water film through capillary seepage, accurately simulating the friction conditions under human sweat environment. The anti-corrosion coating on the inner wall of the receiving cavity, the sealing cap with raw material tape, and the piston head sealing ring design effectively prevent the leakage of the test medium, ensure the stability of the environmental simulation, and solve the problem that existing devices cannot accurately simulate wet friction. 3. The yarn friction detection device disclosed in this invention is equipped with soft rubber anti-slip pads in clamps I and II, and the anti-slip texture design on the inner wall of the clamping groove and the bottom of the pressure plate ensures that the yarn is firmly clamped and does not slip, while avoiding damage to the yarn surface during clamping. Clamps I and II can clamp two crossed yarns at the same time. Through the cooperation of the slide, swing rod and rotating rod, targeted friction detection of the knotted area of ​​the yarn can be realized, accurately simulating the key wear parts in the actual use of the yarn, and greatly improving the practicality of the detection.

[0018] This invention enables friction testing under various environments, including dry and wet conditions (simulating sweat). It can perform multi-directional friction testing of the entire yarn and also conduct specialized testing on key parts such as weaving and knotting points, covering the core testing needs in the production and use of colored yarns. By adjusting the distance between friction wheels with a lever, changing the weight of the counterweight, and using a multi-specification clamping groove design, it can adapt to the testing of colored yarns of different diameters and materials, greatly expanding the applicability of the device and reducing the equipment investment cost for testing various types of yarns.

[0019] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a three-dimensional structural schematic diagram of a yarn friction detection device according to the present invention; Figure 2 This is a schematic diagram of the structure of a colored yarn friction detection device according to the present invention from another perspective; Figure 3 This is a schematic diagram of the clamp I and tension adjustment mechanism of the colored yarn friction detection device of the present invention; Figure 4 This is a schematic diagram of the fixture I structure of the yarn friction detection device of the present invention; Figure 5 This is a schematic diagram of the fixture II structure of the yarn friction detection device of the present invention; Figure 6 for Figure 5 Another perspective structural diagram; Figure 7 This is an exploded view of the friction mechanism of a colored yarn friction detection device according to the present invention. Figure 8 This is a schematic diagram of the friction wheel installation structure of a colored yarn friction detection device according to the present invention; Figure 9 This is a cross-sectional view of the friction wheel II in the yarn friction detection device of the present invention; Figure 10 This is a schematic diagram of a clamping method for a yarn friction detection device according to the present invention; Figure 11 This is a schematic diagram of another clamping method of the colored yarn friction detection device of the present invention.

[0021] Reference numerals: 1. Base; 2. Protective cover; 3. Support seat I; 4. Slide plate; 5. Rotating seat; 6. Stud; 7. Lifting seat; 8. Friction mechanism; 81. Fixed ring; 82. Rotating ring; 83. Rectangular opening; 84. Mounting seat; 85. Friction wheel I; 86. Cover plate; 87. Drive motor; 88. Gear ring; 89. Friction wheel II; 891. Receiving cavity; 892. Groove; 893. Sealing cover; 894. Diaphragm; 895. Connecting cylinder; 896. Screw; 897. Piston head; 810. Rectangular hole; 811. Guide rod; 812. Lever; 813. Spring; 814. Oblong hole; 9. Clamp Fixture I; 91. Fixture base plate; 92. Clamping groove I; 93. Clamping groove II; 94. Screw I; 95. Pressure plate I; 10. Tension adjustment mechanism; 101. Support frame; 102. Guide wheel; 103. Pull rope; 104. Counterweight; 11. Fixture II; 111. Fixed seat; 112. Rectangular groove; 113. Slide; 114. Positioning column; 115. Pressure plate II; 116. Screw II; 117. Rotating rod I; 118. Rotating rod II; 119. Nut ring; 120. Bolt; 121. Swing rod; 122. Extension column; 12. Support seat II; 13. Motor; 14. Drive disc; 15. Drive rod. Detailed Implementation

[0022] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0024] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present 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. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] Example 1

[0026] like Figures 1-11 As shown, a yarn friction detection device is disclosed. The base 1 of the device is a rectangular plate structure made of high-strength aluminum alloy. The bottom of the base 1 is equipped with an anti-slip pad to prevent displacement during operation. The top surface is precision-machined to ensure the parallelism and flatness of the guide rails after installation, providing a foundation for the stable operation of each component. Two parallel transverse guide rails are bolted to the top of the base 1, extending along the length of the base 1. A slider adapted to the transverse guide rails is fixed to the bottom of the clamp base plate 91 of clamp I 9 by screws. The slider and guide rails are fitted with a clearance fit, and the guide rail surface is coated with grease to reduce friction during sliding. Dust covers are provided on both sides of the slider to prevent dust from entering the guide rail gap and affecting sliding accuracy, allowing clamp I 9 to slide stably along the length of the base 1. The fixing seat 111 of clamp II 11 is bolted to the end of the top of the base 1 away from the tension adjustment mechanism 10. Clamps I 9 and clamp II 111 are correspondingly arranged along the length of the base 1 and are used to clamp the two ends of the yarn.

[0027] The support frame 101 of the tension adjustment mechanism 10 is welded to the top of the base 1 near the clamp I9. The support frame 101 is a frame structure, and guide wheels 102 are rotatably mounted on its top crossbeam and the vertical beam near the clamp I9 via rotating shafts. Axial positioning sleeves are provided at both ends of the rotating shaft of the guide wheel 102 to prevent axial movement of the guide wheel 102 during rotation. The grooves of the two guide wheels 102 are correspondingly arranged. One end of the pull rope 103 is fixedly connected to the side of the clamp base plate 91 away from the clamp II 11 by screws. The pull rope 103 is made of high-strength nylon rope with a wear-resistant surface treatment. Wear-resistant pads are provided at the contact points with the grooves of the guide wheels 102 to prevent the pull rope 103 from wearing and breaking after long-term use. The other end passes through the grooves of the two guide wheels 102 in sequence and is fixedly connected to the top of the counterweight 104 by a buckle. A vertical guide rail is fixedly installed on the vertical beam of the support frame 101 on the side away from clamp I9. A sliding sleeve adapted to the vertical guide rail is fixedly installed on the back of the counterweight 104 by screws. The sliding sleeve slides on the vertical guide rail, allowing the counterweight 104 to rise and fall smoothly along the vertical guide rail. According to the tension required for the test, counterweights 104 of different weights are selected. The weight of the counterweight 104 is used to pull clamp I9 along the transverse guide rail away from clamp II11 through the pull rope 103, thereby tightening the yarn and ensuring that the yarn tension is constant during the test.

[0028] Support base II 12 is bolted to the top of base 1 near the end of clamp I 9. Support base II 12 is an L-shaped plate structure. Shock-absorbing pads are provided between its horizontal plate and base 1 to reduce the transmission of vibrations generated by motor 13 during operation to base 1, thus reducing the impact on detection accuracy. Reinforcing ribs are provided on the vertical plate to enhance the structural strength of the support base and ensure the stability of motor 13 after installation. Motor 13 is bolted to the outer side of the vertical plate of support base II 12. Motor 13 is a servo motor with a keyway at the end of its output shaft. After being connected to drive disk 14 via a flat key, it is axially fixed with a lock nut to prevent drive disk 14 from loosening and falling off during rotation. Heat sinks are provided on the motor 13 housing to accelerate heat dissipation during operation and extend the service life of motor 13. Support base I 3 is bolted to the top center of base 1. Support base I 3 is a rectangular block structure. A horizontal guide rail is fixed to the side near motor 13. Limit blocks are provided at both ends of the guide rail to prevent the slide plate 4 from exceeding its travel range and causing component collision damage. The slide plate 4 is a rectangular plate structure. A slider adapted to the vertical guide rail is fixed to one side by screws. The connecting surface between the slider and the slide plate 4 is milled to ensure the perpendicularity after connection. The slider slides and engages with the vertical guide rail, allowing the slide plate 4 to move back and forth along the horizontal guide rail. The edge of the drive disk 14 away from the motor 13 is rotatably connected to one end of the drive rod 15 via a rotating shaft. The other end of the drive rod 15 is rotatably connected to the bottom edge of the slide plate 4 via a rotating shaft. After the motor 13 is started, the motor 13 drives the drive disk 14 to rotate. The drive disk 14 pulls the slide plate 4 along the vertical guide rail to make reciprocating up and down movements through the drive rod 15, thereby driving the friction mechanism 8 on one side of the slide plate 4 to move back and forth synchronously, realizing friction detection at different positions of the colored yarn.

[0029] A rotating seat 5 is bolted to one side of the slide plate 4. The rotating seat 5 has a U-shaped block structure with a locating pin between its two side plates to ensure the coaxiality of the two shaft holes. Deep groove ball bearings are installed in the shaft holes. The outer ring of the deep groove ball bearing is interference-fitted with the shaft hole, and the inner ring is transition-fitted with the stud 6. Bearing caps are provided at both ends of the bearing to prevent dust and impurities from entering the bearing and affecting the rotation flexibility. The stud 6 passes through the inner rings of the two deep groove ball bearings, allowing the stud 6 to rotate freely within the rotating seat 5. The top of the stud 6 extends to the top of the rotating seat 5 and is fixedly mounted with a handwheel. The surface of the handwheel has anti-slip textures to facilitate the operator to apply force when rotating. The connection between the handwheel and the stud 6 is fixed by welding, and the weld has reinforcing ribs to enhance the connection strength and prevent the handwheel from loosening after long-term rotation. A vertical guide rail is fixedly installed on one side of the slide plate 4 next to the rotating seat 5. The lifting seat 7 is a rectangular block structure. A slider adapted to the vertical guide rail is fixedly installed on one side of the slide plate 4 by screws. The slider slides and engages with the vertical guide rail. A nut is embedded and fixed inside the lifting seat 7. The nut and the insertion point of the lifting seat 7 adopt an interference fit and are circumferentially fixed by a pin to prevent the nut from rotating inside the lifting seat 7. The nut and the stud 6 are threadedly engaged. Turning the handwheel drives the stud 6 to rotate. Through the threaded engagement between the nut and the stud 6, the lifting seat 7 is driven to rise and fall along the vertical guide rail. The fixed ring 81 of the friction mechanism 8 is fixed to the side of the lifting seat 7 away from the slide plate 4 by bolts. The fixed ring 81 is a ring structure with an annular groove on its inner wall. The inner wall of the annular groove is ground to ensure the fitting accuracy with the rotating ring 82. The rotating ring 82 is rotatably installed in the annular groove. A thrust ball bearing is installed between the outer wall of the rotating ring 82 and the inner wall of the annular groove. The thrust ball bearing has cages on both sides to prevent the balls from falling out. The outer ring of the bearing is interference-fitted with the inner wall of the annular groove, and the inner ring is transition-fitted with the outer wall of the rotating ring 82 to reduce the friction when the rotating ring 82 rotates and ensure that the rotating ring 82 rotates smoothly. In addition, a protective cover 2 is fixed to the top of the base 1 by bolts to avoid mechanical accidents during operation and to not affect the movement of the lifting seat 7 and the slide plate 4.

[0030] The inner wall of the rotating ring 82 is fixedly connected to the mounting base 84 by welding. The mounting base 84 is a plate-shaped structure with positioning scales on its top to facilitate the even distribution and installation of multiple friction wheels I 85 and II 89. Multiple installation positions are evenly distributed along the circumference of the top of the mounting base 84. Multiple friction wheels I 85 and II 89 are rotatably mounted at their corresponding installation positions via rotating shafts. The rotating shafts of the friction wheels are fixedly connected to the mounting base 84 or the lever 812 via bearing seats. The bearing seats are fastened to the mounting base 84 or the lever 812 with screws to ensure the stability of the rotating shafts during rotation. The outer walls of both friction wheels I 85 and II 89 have grooves 892. The grooves 892 are arc-shaped, with their curvature matching the outer diameter of the spun yarn. The inner walls of the grooves 892 are polished to reduce wear during friction with the spun yarn. Simultaneously, the width of the grooves 892 is slightly larger than the diameter of the yarn, ensuring that the yarn can be completely embedded within the grooves 892, achieving comprehensive frictional contact and guaranteeing reliable contact between the friction wheels and the yarn. A gear ring 88 is fixedly fitted onto the outer wall of the rotating ring 82 via a flat key. A cover plate 86 is fixedly mounted on one side of the fixed ring 81 via bolts. The cover plate 86 is an annular plate structure, and a drive motor 87 is fixedly mounted on one side via bolts. The drive motor 87 is a geared motor, and its output shaft is connected to the gear via a flat key and is axially fixed by a cotter pin. The gear teeth are carburized to improve their hardness and wear resistance, extending their service life. The meshing clearance between the gear and the gear ring 88 is adjusted to ensure smooth and shock-free transmission. The output end of the drive motor 87 passes through the cover plate 86 and is fixedly connected to a gear via a flat key. This gear meshes with the gear ring 88. After the drive motor 87 is started, it drives the gear to rotate, which in turn drives the gear ring 88 and the rotating ring 82 to rotate synchronously. This, in turn, drives multiple friction wheels I 85 and II 89 on the mounting base 84 to perform circular motion around the axis of the spun yarn, realizing multi-directional friction detection of the yarn.

[0031] A rectangular hole 810 is provided on one side of the mounting base 84, extending radially along the mounting base 84. Two guide rods 811 are arranged in parallel. The two ends of the guide rods 811 are connected to the inner wall of the rectangular hole 810 by threads, and threadlocker is applied to the connection to prevent the guide rods 811 from loosening after long-term use. The surface of the guide rods 811 is chrome-plated to improve surface hardness and wear resistance, reducing frictional wear with the through hole of the lever 812. The two guide rods 811 are respectively fixed to the inner walls of the two sides of the rectangular hole 810 by threads. The lever 812 is a rectangular plate structure with through holes at both ends. Wear-resistant bushings are provided on the inner walls of the through holes. The bushings slide with the guide rods 811 to reduce the friction when the lever 812 slides. The two guide rods 811 pass through the corresponding through holes, allowing the lever 812 to slide along the guide rods 811. The top of the lever 812 is provided with a bearing seat mounting surface, which is milled to ensure the flatness of the bearing seat after installation and to ensure smooth rotation of the friction wheel shaft. A spring 813 is sleeved on the outer wall of the guide rod 811. Spring seats are located at both ends of the spring 813, respectively fitting against the inner wall of the lever 812 and the rectangular hole 810. The spring seats are made of wear-resistant material to prevent excessive wear between the spring 813 and the contact surface during extension and retraction. One end of the spring 813 abuts against one side of the lever 812, and the other end abuts against the inner wall of the rectangular hole 810 on the side furthest from the center of the mounting base 84. The spring 813 is always in a compressed state, and its elastic coefficient has been selected to ensure a stable elastic force for the lever 812, maintaining appropriate contact pressure between the friction wheel and the yarn, and providing the lever 812 with an elastic force towards the center of the mounting base 84. Multiple friction wheels I 85 are divided into two groups. The shaft of one group of friction wheels I 85 is rotatably mounted on the top of the mounting base 84 via bearings. The shafts of the other group of friction wheels I 85 and all friction wheels II 89 are rotatably mounted on the top of the lever 812 via bearings. The top of the mounting base 84 has a waist-shaped hole 814 that matches the shaft. The waist-shaped hole 814 extends longitudinally along the mounting base 84. The bottom of the shaft passes through the waist-shaped hole 814 and is fixedly connected to the lever 812. When the lever 812 slides along the guide rod 811, the shaft moves along the waist-shaped hole 814, thereby driving the corresponding friction wheels I 85 and friction wheels II 89 to move closer to or away from the yarn, adapting to the friction detection requirements of yarns of different diameters. At the same time, the elastic force of the spring 813 ensures that the friction wheels and the yarn maintain a stable contact pressure.

[0032] The roller body of friction wheel II 89 is made of a material with a microporous structure. The receiving cavity 891 is used to store liquid. When the screw 896 is rotated to push the piston head 897, the pressure in the sealed cavity formed by the diaphragm 894, the receiving cavity 891 and the connecting cylinder 895 can be changed. This pressure change causes the liquid to slowly and evenly seep out to its outer surface through the micropores of the roller body under the action of capillary force, forming a micro-wet film that simulates the sweat environment. By adjusting the screw depth of the screw 896, the pressure in the cavity can be controlled, thereby achieving precise adjustment of the liquid seepage rate. The receiving cavity 891 is a cylindrical cavity with an anti-corrosion coating on its inner wall to prevent the test medium from corroding the receiving cavity 891. The inner wall has an internal thread, and the outer wall of the sealing cover 893 has an external thread. Teflon tape is wrapped on the external thread to enhance the sealing performance between the sealing cover 893 and the receiving cavity 891 and prevent the test medium from leaking. The sealing cover 893 is installed at the top of the receiving cavity 891 by a threaded connection. The bottom of the sealing cap 893 is fixedly connected to the diaphragm 894 with glue. The diaphragm 894 is made of elastic rubber and its size is adapted to the inner wall of the receiving cavity 891. The edge of the diaphragm 894 is fixed to the bottom of the sealing cap 893 with a pressure ring. The pressure ring is fastened to the sealing cap 893 with screws to ensure that the diaphragm 894 is firmly connected. The thickness of the diaphragm 894 is uniform, ensuring the consistency of elastic deformation, thereby accurately controlling the seepage rate of the test medium. The diaphragm 894 can elastically deform within the receiving cavity 891. A through hole is provided on one side of the sealing cap 893. One end of the connecting cylinder 895 is fixed in the through hole by welding. The welding is done with full welding process to ensure welding strength and sealing performance. The inner wall of the outer end of the connecting cylinder 895 is provided with internal threads, and the outer wall of the screw 896 is provided with external threads. The screw 896 is threaded and installed through one end of the connecting cylinder 895. The inner wall of the connecting cylinder 895 is honed to ensure the sliding fit accuracy with the piston head 897. One end of the screw 896 extends into the connecting cylinder 895 and is rotatably connected to the piston head 897 through a rotating shaft. The piston head 897 has a cylindrical structure and a sealing ring is provided on its outer wall to enhance the sealing performance between the piston head 897 and the inner wall of the connecting cylinder 895 and prevent air leakage. The outer wall of the piston head 897 slides and fits against the inner wall of the connecting cylinder 895. Both the fixed ring 81 and the rotating ring 82 have rectangular openings 83 at their tops. The positions of the rectangular openings 83 correspond to the receiving cavity 891 of the friction wheel II 89. The edges of the rectangular openings 83 are chamfered to facilitate the injection of the test medium. The size of the rectangular openings 83 is adapted to the opening of the receiving cavity 891, facilitating the injection of test media such as simulated sweat and lubricating oil into the receiving cavity 891. After the test medium is injected, the rotating screw 896 pushes the piston head 897 to move along the connecting cylinder 895. The piston head 897 then compresses the air inside the connecting cylinder 895, causing the diaphragm 894 to deform into the receiving cavity 891, controlling the seepage rate of the test medium and simulating friction conditions under different environments.

[0033] The clamp base plate 91 of clamp I9 is ​​a circular plate structure with two clamping slots I92 and one clamping slot II93 on its top. The clamping slot II93 is located between the two clamping slots I92. Both clamping slots I92 and clamping slot II93 are rectangular. A pressure plate I95 is placed in both clamping slots I92 and clamping slot II93. The pressure plate I95 is a rectangular plate structure. The bottom wall of the clamping slot and the bottom of the pressure plate are provided with anti-slip pads. The anti-slip pads are made of soft rubber material, which not only ensures the reliability of clamping, but also avoids damage to the yarn surface and prevents damage to the yarn during clamping. Two through holes are provided on the top of the pressure plate I95. The screw I94 passes through the through holes and is threadedly connected to the threaded hole on the top of the clamp base plate 91. The screw I94 fits tightly with the threaded hole of the clamp base plate 91 to ensure that it will not loosen after tightening, thus achieving long-term reliable clamping of the yarn. Tightening the screw I94 will push the pressure plate I95 to move downward, pressing and fixing the colored yarn placed in the clamping groove I92 or clamping groove II93, thus achieving reliable clamping of both ends of the yarn.

[0034] The fixture II 111 has a T-shaped fixed base with two parallel rectangular slots 112 on one side. The inner wall of the rectangular slots 112 is provided with guide strips. The slide 113 has guide slots on both sides that are adapted to the guide strips. The guide strips and guide slots slide together to ensure the straightness of the slide 113 when it moves. The two ends of the rectangular slots 112 are provided with buffer pads to prevent the slide 113 from colliding violently with the end of the slot when it moves. The slide 113 is a rectangular block structure that is slidably installed in the rectangular slots 112. The slide 113 can move horizontally along the rectangular slots 112. Positioning posts 114 are fixedly installed on one side of both the slide 113 and the fixed seat 111 by welding. The positioning posts 114 are cylindrical structures with polished surfaces to reduce friction with the through holes of the pressure plate II 115. The length of the positioning posts 114 is slightly greater than the thickness of the pressure plate to ensure that the pressure plate can be stably fitted on the positioning posts 114 without tilting. The outer wall of the positioning posts 114 is fitted with pressure plate II 115, which is a rectangular plate structure. Rubber pads with anti-slip textures are provided on the inner side of the pressure plate II 115 and on one side of the slide 113 and the fixed seat 111 to enhance the friction with the yarn and prevent the yarn from sliding after being clamped. The edges of the pressure plate are rounded to avoid sharp edges damaging the yarn. Through holes that fit the positioning posts 114 are provided on the pressure plate II 115 to facilitate the installation and positioning of the pressure plate II 115. One side of the pressure plate II115 has a through hole. Screws II116 pass through the corresponding through holes and are threaded into the threaded holes on one side of the slide 113 and the fixed seat 111, respectively. The head of screw II116 has an internal hexagonal groove for easy tightening with an internal hexagonal wrench. The threads of the screw are coated with anti-loosening glue to ensure that it will not loosen due to vibration after tightening. The length of the screw is selected to ensure that it can reliably press the pressure plate after tightening, while not excessively squeezing and damaging the yarn.

[0035] A swing rod 121 is rotatably mounted on the back of the fixed base 111 via a rotating shaft. The swing rod 121 is a long strip plate structure with openings at both ends. The openings are U-shaped groove structures, and the inner walls of the openings are provided with wear-resistant bushings. The bushings slide with the extension column 122 to reduce frictional loss between the swing rod 121 and the extension column 122 when rotating. The connection between the rotating shaft of the swing rod 121 and the fixed base 111 is supported by bearings, and the bearings are fixed by snap rings to ensure smooth rotation of the swing rod 121. An extension column 122 is fixedly installed on one side of the slide block 113 by welding. The extension column 122 is a cylindrical structure with a chamfer at its end to facilitate insertion into the opening of the swing rod 121. The weld between the extension column 122 and the slide block 113 is reinforced with a reinforcing rib to enhance the connection strength and prevent the extension column 122 from loosening and falling off after long-term use. It slides and engages in the openings at both ends of the swing rod 121. When one of the slide blocks 113 moves, the extension column 122 drives the swing rod 121 to rotate around the pivot, and then drives the other slide block 113 to move in the opposite direction synchronously through the opening at the other end, ensuring the synchronous movement of the two slide blocks 113 and making the yarn clamping more symmetrical and stable. A rotating rod I 117 is rotatably mounted on one side of the top extension column 122 via a rotating shaft. The rotating rod I 117 is a solid rectangular structure, and the rotating rod II 118 is a hollow rectangular structure. The inner wall of the rotating rod I 117 is provided with a guide key, and the outer wall of the rotating rod II 118 is provided with a guide groove that matches the guide key. The guide key and the guide groove slide together to prevent the rotating rod I 117 and the rotating rod II 118 from rotating relative to each other, ensuring smooth sliding between them. The outer wall of the rotating rod I 117 slides against the inner wall of the rotating rod II 118, allowing the rotating rod I 117 to slide along the axial direction of the rotating rod II 118. The other end of the rotating rod II 118 is rotatably connected to one side of the slide plate 4 via a rotating shaft. A nut ring 119 is fixedly installed on one side of the rotating rod II 118 by welding. The welding joint between the nut ring 119 and the rotating rod II 118 adopts a fillet welding process to ensure welding strength. The inner wall of the nut ring 119 has an internal thread. The internal thread is machined with precision control, and the clearance with the bolt 120 is moderate. The bolt 120 is threaded into the nut ring 119. One end of the bolt 120 contacts the end face of the rotating rod I 117. The head of the bolt 120 is knurled, which is convenient for the operator to tighten manually without additional tools, thus improving the convenience of operation. One end of the bolt 120 extends into the rotating rod II 118 and abuts against the end face of the rotating rod I 117. Tightening the bolt 120 can fix the relative position of the rotating rod I 117 and the rotating rod II 118 to control the movement and start / stop of the rotating rod I 117. When the slide plate 4 moves back and forth, the sliding block 113 moves synchronously through the rotating rod I 117 and rotating rod II 118, which allows one bent colored yarn to rub around another bent colored yarn.

[0036] The device also includes a PLC controller, which is fixed to one side of the base 1 and electrically connected to the motor 13 and the drive motor 87 respectively. It is used to control the reciprocating stroke and speed of the motor 13 and the rotation speed of the drive motor 87 to achieve coordinated operation between the two. The PLC controller is equipped with an operation panel, through which detection parameters can be preset.

[0037] When using this device, first check whether the connections of each component are secure and whether sufficient grease has been applied to the guide rails and bearings. Select a counterweight 104 of appropriate weight according to the test requirements. Place one end of the colored yarn in the clamping groove II93 of the clamp I9 and tighten the screw I94 to press the pressure plate I95 against one end of the yarn. Turn the handwheel adjusting stud 6 to drive the lifting seat 7 and friction mechanism 8 to rise and fall, so that the grooves 892 of friction wheels I85 and II89 contact the yarn. The spring 813 pushes the lever 812 to keep the friction wheels and yarn horizontal. Pull the lever 812 outward to drive a set of friction wheels I85 and II89 to move outward, placing the middle part of the colored yarn on the two sets of friction wheels I85 and II89. Between 89, release lever 812. At this time, lever 812 returns to its original position under the force of spring 813, causing the two sets of friction wheels I 85 and friction wheels II 89 to clamp the colored yarn. Place the other end of the yarn between the pressure plate II 115 of clamp II 111 and the fixed seat 111, tighten screw II 116 to make the pressure plate II 115 press the other end of the yarn. The weight of counterweight 104 pulls clamp I 9 through pull rope 103 to tighten the yarn. Start motor 13 and drive motor 87. Motor 13 drives slide plate 4 and friction mechanism 8 to move back and forth. Drive motor 87 drives friction wheels I 85 and friction wheels II 89 to rotate around the yarn axis, realizing multi-directional and dynamic friction detection of colored yarn (e.g. Figure 10 (as shown) To simulate friction under specific conditions, an appropriate amount of test medium is injected into the receiving cavity 891 of friction wheel II 89 through rectangular opening 83. After injection, the sealing cover 893 is closed, and the piston head 897 is adjusted by rotating screw 896 to control the seepage rate of the test medium. When the yarn comes into contact with friction wheel II 89, the medium seeping from its outer wall simulates sweat soaking into the yarn. Motor 13 and drive motor 87 are started. Motor 13 drives slide plate 4 and friction mechanism 8 to move reciprocally, while drive motor 87 drives friction wheel I 85 and friction wheel II 89 to rotate around the yarn axis, achieving multi-directional, dynamic friction detection of the yarn. During the detection process, the friction condition of the yarn can be observed to ensure the normal operation of the detection process. After the detection is completed, motor 13 and drive motor 87 are turned off, screw I 94 and screw II 116 are loosened, and the yarn can be removed to observe its wear, color fading, etc., after friction, completing the detection process.

[0038] Next, fix both ends of a yarn in the two clamping grooves I92, and simultaneously drive the friction mechanism 8 to move upward to a safe position. Another colored yarn passes through this yarn, with both ends fixed to one side of the two slide blocks 113. Tighten bolts 120 to fix rotating rod I117 and rotating rod II118. Start motor 13, which drives slide plate 4 to move back and forth. Slide plate 4 drives slide block 113 to move back and forth via rotating rod I117 and rotating rod II118. During this movement, the colored yarn can move back and forth, most realistically testing the abrasion resistance of the colored yarn at the weaving knot (e.g., ...). Figure 11 (As shown).

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A device for detecting friction in spun yarn, characterized in that, include: A base (1) is provided with a clamp I (9) slidably disposed on the top of the base (1) and a clamp II (11) is fixedly disposed on the top of the base (1). The clamp I (9) and the clamp II (11) cooperate to clamp the two ends of the colored yarn. Tension adjustment mechanism (10), which is fixed to the top of the base (1) and located on one side of the clamp I (9), is used to drive the clamp I (9) to move to tighten the colored yarn; Support base II (12), which is fixed to the top of the base (1), and a motor (13) is fixed on one side of it; Support seat I (3), the support seat I (3) is fixed to the top of the base (1), and a sliding plate (4) is slidably provided on one side of it. The output end of the motor (13) is connected to the sliding plate (4) to drive the sliding plate (4) to move back and forth. Friction mechanism (8), which can be raised and lowered on one side of the slide plate (4), includes multiple friction wheels I (85), friction wheels II (89) and drive motor (87). The drive motor (87) drives multiple friction wheels I (85) and friction wheels II (89) to rotate around the axis of the colored yarn, so as to realize multi-directional friction detection of the yarn.

2. The yarn friction detection device according to claim 1, characterized in that, The friction mechanism (8) also includes a fixed ring (81), a rotating ring (82) and a mounting base (84). The fixed ring (81) is vertically connected to the slide plate (4). The rotating ring (82) is rotatably embedded in the fixed ring (81). The mounting base (84) is fixed in the rotating ring (82). Multiple friction wheels I (85) and friction wheels II (89) are installed on the top of the mounting base (84). The outer wall of each wheel is provided with a groove (892) that is compatible with the yarn. The outer wall of the rotating ring (82) is fixedly fitted with a toothed ring (88), and a cover plate (86) is fixed on one side of the fixed ring (81). The drive motor (87) is fixed to the cover plate (86), and its output end is fixed with a gear that meshes with the toothed ring (88). The drive motor (87) drives the rotating ring (82) to rotate through the gear-toothed ring transmission.

3. The yarn friction detection device according to claim 2, characterized in that, A rotating seat (5) is fixed on one side of the slide plate (4). A stud (6) is inserted through and rotated inside the rotating seat (5). A lifting seat (7) is slidably arranged on one side of the slide plate (4). A nut is fixed inside the lifting seat (7). The nut is threadedly engaged with the stud (6). The fixing ring (81) is fixed on the side of the lifting seat (7) away from the slide plate (4). Rotating the stud (6) can drive the lifting seat (7) to drive the friction mechanism (8) to rise and fall.

4. The yarn friction detection device according to claim 1, characterized in that, The output end of the motor (13) is fixed with a drive disk (14), and a drive rod (15) is rotatably connected to the edge of the drive disk (14) away from the motor (13). The other end of the drive rod (15) is rotatably connected to the slide plate (4). When the motor (13) drives the drive disk (14) to rotate, the drive rod (15) pulls the slide plate (4) to move back and forth along the support seat I (3), thereby driving the friction mechanism (8) to detect friction at different positions of the yarn.

5. The yarn friction detection device according to claim 2, characterized in that, A rectangular hole (810) is provided on one side of the mounting base (84). Two parallel guide rods (811) are fixed inside the rectangular hole (810). A lever (812) is slidably sleeved on the outer wall of the guide rod (811). A spring (813) is sleeved on the guide rod (811). The two ends of the spring (813) abut against the lever (812) and the inner wall of the rectangular hole (810) respectively. Multiple friction wheels I (85) are divided into two groups. One group is rotatably connected to the mounting base (84) via a rotating shaft. The other group of friction wheels I (85) and friction wheels II (89) are rotatably connected to the lever (812) via a rotating shaft. The mounting base (84) has a waist-shaped hole (814) on its top that matches the rotating shaft. The lever (812) can slide along the guide rod (811) to adjust the distance between the friction wheels and adapt to yarns of different diameters.

6. The yarn friction detection device according to claim 5, characterized in that, The friction wheel II (89) has a receiving cavity (891) at the top, and a sealing cover (893) is threaded to the top of the receiving cavity (891). A diaphragm (894) located inside the receiving cavity (891) is fixed at the bottom of the sealing cover (893). A connecting cylinder (895) is inserted and fixed to one side of the sealing cap (893). A screw (896) is threaded through the connecting cylinder (895). A piston head (897) is rotatably connected to one end of the screw (896). A rectangular opening (83) corresponding to the receiving cavity (891) is opened on the top of both the fixed ring (81) and the rotating ring (82). The test medium is injected into the receiving cavity (891) through the rectangular opening (83). The rotating screw (896) pushes the piston head (897) to squeeze the diaphragm (894) to control the medium seepage rate to simulate a wet friction environment.

7. The yarn friction detection device according to claim 1, characterized in that, The clamp I (9) includes a clamp base plate (91), a pressure plate I (95) and a screw I (94). The clamp base plate (91) is slidably connected to the top of the base (1). Two clamping grooves I (92) and one clamping groove II (93) are opened on its top. The clamping groove II (93) is located between the two clamping grooves I (92). The pressure plate I (95) is placed in the clamping groove I (92) and the clamping groove II (93) respectively. The screw I (94) passes through the pressure plate I (95) and is threadedly connected to the clamp base plate (91). Tightening the screw I (94) can make the pressure plate I (95) press and fix the yarn.

8. The yarn friction detection device according to claim 7, characterized in that, The tension adjustment mechanism (10) includes a support frame (101), two guide wheels (102), a pull rope (103) and a counterweight (104). The support frame (101) is fixed to the top of the base (1), and the two guide wheels (102) are respectively rotatably installed on the top of the support frame (101) and on the side near the clamp I (9). One end of the pull rope (103) is fixed to the base plate (91) of the clamp, and the other end passes around the two guide wheels (102) and is fixed to the counterweight (104). The support frame (101) is fixed with a vertical guide rail on the side away from the clamp I (9). The counterweight (104) slides with the vertical guide rail. The counterweight (104) pulls the clamp I (9) by gravity to maintain the constant yarn tension.

9. The yarn friction detection device according to claim 1, characterized in that, The clamp II (11) includes a fixed seat (111), two slides (113), a pressure plate II (115) and a screw II (116). The fixed seat (111) is fixed to the top of the base (1), and two parallel rectangular slots (112) are opened on one side. The slides (113) are slidably embedded in the rectangular slots (112). The slide (113) and the fixed seat (111) are both fixed with a positioning post (114) on one side. The pressure plate II (115) is sleeved on the outer wall of the positioning post (114). The screw II (116) passes through the pressure plate II (115) and is threaded to the slide (113) and the fixed seat (111) respectively. The fixed seat (111) is rotatably provided with a swing rod (121) on the other side, with openings at both ends. An extension column (122) is fixed on one side of the slide (113). The extension column (122) is slidably locked in the opening. The top extension column (122) is rotatably fitted with a rotating rod I (117). The rotating rod I (117) is slidably fitted with a rotating rod II (118). The rotating rod II (118) is rotatably connected to the slide plate (4). A bolt (120) is provided on one side of the rotating rod II (118). The end of the bolt (120) abuts against the rotating rod I (117) to fix their relative positions. When the slide plate (4) moves, it can drive the slide (113) to move synchronously, realizing the friction detection of the cross yarns.

10. A method for detecting friction in spun yarn, characterized in that, The yarn friction detection device according to any one of claims 1 to 9 comprises the following steps: S1: Select a counterweight (104) according to the test requirements, place one end of the colored yarn in the clamping groove of clamp I (9), tighten screw I (94) and fix it by pressure plate I (95); S2: Pull the lever (812) to move a set of friction wheels I (85) and friction wheels II (89) outward, place the middle part of the yarn between the two sets of friction wheels, release the lever (812), and the spring (813) pushes the lever (812) to make the friction wheels clamp the yarn. The other end of the yarn is fixed by the pressure plate II (115) and screw II (116) of the clamp II (11). S3: Start the motor (13) and drive motor (87). The motor (13) drives the friction mechanism (8) to move back and forth, and the drive motor (87) drives the friction wheel to rotate around the yarn to complete the dry friction detection. S4: If wet testing is required, inject the test medium into the receiving cavity (891) of the friction wheel II (89) through the rectangular opening (83), rotate the screw (896) to adjust the medium seepage rate, and repeat S3 to complete the wet friction test; S5: To test the abrasion resistance of the knotted area of ​​the yarn, fix one yarn to the two clamping slots I (92) of clamp I (9), and cross the other yarn through and fix it to the two slides (113) of clamp II (11). Fix rotating rod I (117) and rotating rod II (118), start motor (13) to drive slide (113) to move, and complete the knotted area test.

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