CN113358556B - Testing device with inter-yarn friction coefficient and friction fatigue detection functions and application - Google Patents
Testing device with inter-yarn friction coefficient and friction fatigue detection functions and application Download PDFInfo
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Abstract
The invention relates to the technical field of yarn friction performance test, in particular to a test device with the functions of friction coefficient between yarns and friction fatigue detection. The testing device comprises a fixed plate body, an input yarn guide wheel set, a steering yarn guide wheel, an output yarn guide wheel set, a driving component and a counterweight, wherein the testing device also comprises an adjusting yarn guide roller component for eliminating yarn tension fluctuation to ensure tension balance of yarns, and the driving component is an eccentric structure capable of driving yarns in a twisting friction area formed after the yarns are twisted to continuously and oppositely run and rub; an automatic detection system is also included. The application of the testing device with the functions of friction coefficient and friction fatigue detection among yarns in representing the wear-resisting effect and the firmness of the coating on the surface of the yarns is also provided. The invention can truly simulate the yarn friction environment, can realize automatic stop of yarn breakage, has high yarn friction performance testing precision, stable and reliable working performance, simple operation, excellent repeatability and reproducibility and wide applicability, and is worth being widely popularized and applied.
Description
Technical Field
The invention relates to the technical field of yarn friction performance test, in particular to a test device with the functions of friction coefficient between yarns and friction fatigue detection and application thereof.
Background
During the textile process, there is often a relative movement between the yarns, between the yarns and the machine parts, so that friction problems between the yarns or between the yarns and other materials can occur. Having sufficient friction between yarns is a necessary condition for good dimensional stability of the fabric, but excessive friction can cause difficulty in beating up during weaving and thus affect the quality of the cloth cover. The magnitude of the coefficient of friction also directly affects the appearance and style of the fabric. For example, the frictional properties among yarns determine the interweaving resistance of the fabric to a certain extent, and if the interweaving resistance is larger, the fabric feel is generally harder and has a rough feel; if the interweaving resistance is smaller, the fabric is easy to be distorted in the sewing and taking processes. In addition, frictional resistance among yarns plays a decisive role in the difficulty of shearing deformation of the fabric, and the fabric is required to have good shearing deformation capability when the chest and back are plump. That is, the yarn friction performance is an important aspect of the fiber performance, and the interaction between the fibers or yarns plays an important role, both during the spun yarn twisting process and during the use of the fibrous article. The coefficient of friction, which is an important indicator of the frictional properties of yarns, becomes an important aspect of characterizing frictional properties.
As an important physical quantity of the friction coefficient between yarns, fibers, it can affect the processing and performance of the fabric. The yarn surface structure affects not only the strength, appearance and weaving process of the yarn, but also the performance of the woven fabric and the processed clothing. Therefore, the measurement of the yarn friction coefficient has important significance. The dynamic and static friction coefficient of the surface of the yarn is one of important means for representing the surface structure of the yarn, and can provide important basis for performance evaluation and quality monitoring of the yarn. The dynamic friction coefficient of the yarn has an important influence on the technological effect of the fabric and has a great influence on the clothing performance, comfort and appearance of the fabric. In terms of the measurement of the friction coefficient, many test methods such as a winch method and the like have appeared. However, the coefficient of friction obtained using conventional testing methods only reflects one aspect of the friction process and does not characterize the behavior of the fiber or yarn during repeated friction. Therefore, aiming at practical application working conditions, the yarn friction fatigue performance testing device is discussed, and the yarn friction fatigue performance testing device becomes an important aspect for further characterizing the friction performance of the fiber material.
It is known that fibers and yarn assemblies deform during use, relative movement such as slippage, torsion, etc. occurs between fibers during the process, and when such relative movement occurs repeatedly, even continuously at a certain frequency, the relative frictional properties between yarns and fibers become important aspects in measuring the fatigue properties of materials. Taking a maritime work rope as an example, a plurality of bundles of fibers are twisted to form strands, and eight or twelve strands are woven to form the rope. In the marine environment, marine cables are repeatedly stretched and relaxed by the combined action of waves and ocean currents, etc. Friction constantly occurs between the interwoven strands and between the strands in the same direction side by side during the process. Over time, hairiness and fibrous debris form where the strands contact each other inside the cable. Inside the strand, the twisted strand also produces a decay in performance due to repeated friction. Therefore, the system for evaluating the friction performance between different yarns and providing data reference for coating and auxiliary development becomes a key to solving such failure problems. Meanwhile, the obtained dynamic and static friction coefficient with high reality and precision has important guiding significance on the performances of fabrics woven by the dynamic and static friction coefficient, the performance of processed clothes and the performance of ropes. The study of the yarn-to-yarn coefficient of friction and the instrumentation of measuring the yarn-to-yarn coefficient of friction are important methods and means for improving the quality of textiles.
At present, researchers at home and abroad continuously study a measuring method and a measuring instrument for the friction coefficient of yarns. Such as Swiss R-1182 direct-reading type electronic friction coefficient tester, japanese V-pennsyly friction coefficient tester, etc., which is used in China after being introduced into China in the last 80 th century, and cannot be popularized and used in China due to the relatively high price. With the development of technology, such instruments cannot meet the demands of current scientific researchers. After the 21 st century, lawson developed an instrument that could measure the overall quality of yarn, and CTT constant tension transmission systems could be used to measure the dynamic coefficient of friction from yarn to yarn. The system has higher measurement precision, can display friction coefficient curves in real time and store electronic documents, but the instrument is dependent on import and is relatively expensive, and is suitable for domestic conditional scientific research institutions, but not suitable for small factories. The american society for materials also developed the relevant standard ASTM D3412-01 for yarn friction coefficient testing, however, relatively few related devices were designed and developed. At present, the market demand of the yarn and yarn friction coefficient testing device with moderate price, simple and convenient operation and firm effect cannot be met.
Although the method of testing yarn-to-yarn friction fatigue performance is specified in the relevant standard ASTM D6611 for yarn friction coefficient testing, the details and principles of yarn-to-yarn friction testing are described, there are relatively few designs and developments for relevant equipment. The Chinese patent application number is 201410168957.7, which discloses a silver fiber fatigue resistance testing device, in particular a simulation device for simulating friction contact between silver fibers and crochets when the silver fibers are knitted on a knitting machine, and the firmness of silver plating on the surface of the silver fibers is represented by a resistance method. However, the above method cannot simulate the friction condition between the yarn and the actual application state of the yarn.
Further, as disclosed in chinese patent publication No. CN 104007060A, a device for continuously measuring friction coefficient between elastic fibers is specifically disclosed, the device comprising: the tension sensor (1) comprises a first yarn guiding wheel (1-1), a second yarn guiding wheel (2), a third yarn guiding wheel (3), a processor (4), a suspension load (5), a fourth yarn guiding wheel (6), a panel (7), a fixed bracket (8), a winding roller (9) and a steering yarn guiding wheel (10); the elastic fibers are mutually wound between the third yarn guide wheel (3) and the fourth yarn guide wheel (6) for one to several turns to form twisting points, and then the dynamic friction coefficient among the elastic fibers is measured by detecting the friction force of the fibers at the twisting points. Although the device can solve the technical problems that elastic fibers are easy to deform and large in tension detection difference, high-precision and continuous detection of the elastic fibers is realized. But there are also the following disadvantages: firstly, since the winding roller is driven by the motor to wind the yarn to be detected, the yarn continuous friction during one operation of the yarn is only tested, and the friction between yarns is not continuously generated for a friction area for a plurality of times until the yarn breaks, and as is known, in practical application of the yarn, the friction between yarns is continuously generated all the time. Therefore, the friction condition of the yarn and the actual application use state of the yarn cannot be simulated, and the friction coefficient fitting the actual use state of the yarn cannot be obtained, and the accuracy of the friction coefficient obtained by the final test is relatively low. Secondly, the second yarn guiding wheel, the third yarn guiding wheel and the fourth yarn guiding wheel are connected to form a wrap angle, and the wrap angle is smaller than 90 degrees. Due to the wrap angle, the yarn is very easy to generate fluctuation factors such as swing and the like which influence the tension balance of the yarn under the winding of the winding roller, so that the stability of the friction force on the yarn is influenced, the friction coefficient obtained through testing is finally influenced, and the accuracy of the friction coefficient measurement result is relatively low.
In view of the above, there is a need for a yarn and yarn friction performance testing device that can truly simulate the yarn and yarn friction environment, remove the stability factors affecting the yarn friction operation process, and realize automatic stop of yarn breakage, with high precision of testing results, stable and reliable working performance, simple operation, and wide applicability.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the testing device which can truly simulate the friction environment of yarns and the yarns, can realize automatic stop of yarn breakage, has high testing precision of yarn friction performance, stable and reliable working performance, is simple to operate and has wide applicability, and the testing device has the functions of detecting the friction coefficient and friction fatigue between yarns.
The technical scheme adopted by the invention for achieving the purpose is as follows: the testing device with the friction coefficient and the friction fatigue detection between yarns comprises a fixed plate body, an input yarn guide wheel set, a steering yarn guide wheel and an output yarn guide wheel set, wherein the input yarn guide wheel set is used for guiding yarns and is convenient for the yarns to pass through sequentially, the steering yarn guide wheel set is used for guiding the yarns, a driving component and a counterweight are respectively arranged at two ends of the yarns, the driving component and the counterweight are connected with the fixed plate body and are used for driving the yarns to run, the adjusting yarn guide roller component is arranged right above the steering yarn guide wheel and is used for eliminating yarn tension fluctuation so as to ensure tension balance of the yarns, and the driving component is an eccentric structure capable of driving the yarns in a twisting friction area formed after twisting the yarns to continuously run in opposite directions; the automatic detection system comprises display equipment used for parameter setting and displaying friction coefficient change conditions in the yarn friction process in real time, a detection element used for detecting friction circulation times of a yarn twisting friction area, a photoelectric switch used for detecting a counterweight, a tension sensor and a controller, wherein the photoelectric switch sends detection signals to the controller after detecting the counterweight, and the controller sends signals for stopping driving of the driving assembly to the driving assembly.
The driving assembly comprises a rotary table rotationally connected with the fixed plate body, a fixing piece fixedly connected with the end part of the yarn and a motor for driving the rotary table to rotate are eccentrically arranged on the rotary table, and the fixing piece is fixedly connected with the rotary table; the tension sensor comprises an input tension sensor arranged in the input yarn guiding wheel set and used for detecting the input tension and an output tension sensor arranged in the output yarn guiding wheel set and used for detecting the output tension.
The testing device with the friction coefficient and the friction fatigue detection between yarns comprises the adjusting yarn guiding roller assembly, and the right yarn guiding roller which is tangential to one side of the left yarn guiding roller, wherein the tangential position of the left yarn guiding roller and the right yarn guiding roller is the central position of the steering yarn guiding wheel.
The testing device with the inter-yarn friction coefficient and the friction fatigue detection functions is characterized in that the fixing plate body is provided with the accommodating cavity, a container for accommodating the solution when the yarns in the twisting friction area are subjected to wet friction is arranged in the accommodating cavity, the top of the accommodating cavity is provided with the bracket which is used for fixing the steering yarn guiding wheel and can be placed in the container, and the bracket is fixedly connected with the fixing plate body.
The testing device with the inter-yarn friction coefficient and the friction fatigue detection function is characterized in that the bottom of the accommodating cavity is provided with the bracket for supporting the container to lift in the accommodating cavity, and the bracket is in sliding connection with the fixed plate body.
The testing device with the functions of friction coefficient and friction fatigue detection between yarns is characterized in that the controller is a PLC controller, the detection element comprises an infrared counter, a detection signal is sent to the controller after the photoelectric switch detects the counter weight, and the controller sends a signal for stopping counting of the infrared counter to the infrared counter.
The testing device with the functions of friction coefficient and friction fatigue detection among yarns is characterized in that the yarn twisting friction area is self-twisting, and the number of turns of twisting is 2-5.
According to the testing device with the inter-yarn friction coefficient and friction fatigue detection functions, the weight of the counter weight can be adjusted according to the fineness of the yarns, the counter weight is 10-100mN/tex, and the weight accuracy of the counter weight is 0.001g.
The testing device with the functions of friction coefficient and friction fatigue detection among yarns is characterized in that the motor is a servo motor, and the rotation frequency of the servo motor is 0.01-2Hz.
The application of the testing device with the functions of friction coefficient and friction fatigue detection among yarns in representing the wear-resisting effect and the firmness of a coating on the surface of the yarns.
The testing device for testing friction coefficient and friction fatigue between yarns and application has the beneficial effects that:
the two-in-one testing device which can test the friction coefficient of the yarn and the friction fatigue of the yarn is manufactured for the first time, and the two-in-one testing device can realize the detection of the change condition of the friction coefficient in the friction process.
Firstly, the driving component with the eccentric structure is arranged, so that the yarn to be tested does not rotate along with the reciprocating motion of the fixing piece, continuous opposite running friction of the yarn in the twisting friction area is realized, namely continuous circulating friction is realized until the yarn breaks, the friction condition of the yarn and the actual application use state of the yarn can be simulated, the yarn friction performance test result which is attached to the actual use state of the yarn can be obtained, and the accuracy of the obtained yarn friction performance test result is high. Secondly, adjust the setting of yarn guide roller subassembly, can realize the removal to yarn reciprocating operation in-process tension fluctuation in order to guarantee that the yarn receives tension equilibrium, further improve the accuracy of yarn friction performance survey result. Thirdly, by arranging an automatic detection system, the counting of the detection element can be stopped when the yarn breaks, so that the accuracy of a final measurement result is ensured. Fourth, hold the setting in chamber on the fixed plate body, can effectively realize doing under wet two kinds of states, the test of yarn and yarn friction performance, but true simulation yarn and yarn friction environment help improving yarn friction performance test accuracy, simultaneously, yarn and yarn friction fatigue in-process's friction frequency and counter weight are adjustable, and the test can be set up according to the experimental requirement of difference, makes this device's suitability more extensive. The invention can be used for testing the self friction coefficient and the friction fatigue of continuous slender flexible structures such as filament bundles, spun yarns and the like. The yarn friction environment can be truly simulated, yarn breakage automatic stop can be realized, the yarn friction performance testing precision is high, the working performance is stable and reliable, the operation is simple, the repeatability and the reproducibility are excellent, the applicability is wide, and the yarn friction performance testing device is worthy of being widely popularized and applied.
Drawings
FIG. 1 is a schematic view of the structure of the testing device of the present invention when testing the yarn friction coefficient;
FIG. 2 is a schematic view of the structure of the testing device of the present invention when testing yarn friction fatigue;
FIG. 3 is a schematic view of another embodiment of the testing device of the present invention;
FIG. 4 is a schematic diagram of the structure of the testing device of the present invention.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples;
example 1
As shown in fig. 1-4, a testing device with friction coefficient and friction fatigue detection between yarns comprises a fixed plate body 1, an input yarn guiding wheel set 3 which is used for guiding yarns and is convenient for the yarns to pass through sequentially and is arranged along the length direction of the fixed plate body 1, a steering yarn guiding wheel 4 used for guiding the yarns, and an output yarn guiding wheel set 5, wherein driving components and counterweights 6 which are connected with the fixed plate body 1 and used for driving the yarns 2 to run are respectively arranged at two ends of the yarns 2. In order to ensure the tension balance applied to the yarn in the reciprocating operation process, the testing device of the invention further comprises an adjusting yarn guide roller assembly 7 which is arranged right above the steering yarn guide wheel 4 and used for eliminating yarn tension fluctuation so as to ensure the tension balance applied to the yarn. In order to achieve the purpose of continuously rubbing the yarn and realizing the purpose of truly simulating the actual application use state of the yarn, the driving assembly is arranged into an eccentric structure which can drive the yarn in the twisting friction area 8 formed after the yarn is twisted to continuously and oppositely run and rub. Wherein the twisting friction area 8 is formed by twisting the yarn 2 around itself and is located above the steering yarn guiding wheel 4. The twisting direction is determined according to the twisting direction of the yarn to be measured, and when the yarn to be measured is untwisted, either Z twisting or S twisting can be performed. When the yarn is a twisted yarn, the twist direction is the same as the twist direction of the yarn itself. The weight of the counterweight can be adjusted, and a bag containing steel balls or a vessel containing liquid can be adopted. The weight of the counter weight can be adjusted according to the fineness of the yarn, the counter weight is 10-100mN/tex, and the weight precision of the counter weight is 0.001g. In this embodiment, the input yarn guiding wheel set and the output yarn guiding wheel set are each composed of two yarn guiding wheels.
In this embodiment, the driving assembly includes a turntable 9 rotatably connected to the fixed plate 1, a fixing member 10 fixedly connected to an end of the yarn 2 is eccentrically disposed on the turntable 9, and a motor (not shown in the drawing) for driving the turntable 9 to rotate, the fixing member 10 is fixedly connected to the turntable 9, the motor is a servo motor, and a rotation frequency of the servo motor is 0.01-2Hz. After the motor is started, the motor drives the turntable 9 to rotate, and the fixing piece 10 is fixedly connected with the turntable 9, so that the turntable 9 rotates to drive the fixing piece 10 to rotate, thereby driving the yarn to run. The yarn twisting friction area is formed by twisting the yarn, the number of turns of twisting can be 2-5, after the twisting of the yarn, the rotating disc 9 rotates to turn to the arrangement of the yarn guiding wheel 4, and then the balance weight at the other end of the yarn is combined, so that the yarn in the twisting friction area continuously and oppositely runs and rubs.
In order to ensure the balance of the tension applied to the yarn in the reciprocating operation process to the greatest extent, the adjusting yarn guiding roller assembly in the embodiment comprises a left yarn guiding roller 11 and a right yarn guiding roller 12 tangential to one side of the left yarn guiding roller 11, wherein the tangential part of the left yarn guiding roller 11 and the right yarn guiding roller 12 is the central part of the steering yarn guiding wheel 4. The yarn 2 after twisting can be tangent to the left yarn guiding roller 11 and the right yarn guiding roller 12 respectively by adjusting the setting of the yarn guiding roller assembly, so that the output end and the input end of the yarn 2 are arranged in a nearly parallel manner, and the influence of the swing fluctuation of the output end and the input end of the yarn 2 on the balance of friction force can be eliminated.
In this embodiment, in order to realize wet friction simulation of yarn, a holding cavity 13 is formed on the fixed plate body 1, a container 14 for holding a solution when wet friction is performed on yarn in a twisting friction area is arranged in the holding cavity 13, a bracket 15 for fixing the steering yarn guiding wheel 4 and capable of being placed in the container 14 is arranged at the top of the holding cavity 13, and the bracket 15 is fixedly connected with the fixed plate body 1. The bottom in holding the chamber is provided with the bracket 16 that is used for bearing the container and can realize that the container is holding the intracavity and go up and down, bracket 16 and fixed plate body 1 sliding connection, and concrete connection can adopt prior art to can realize the lift of bracket 16 and take the place as the standard, and this is not repeated here. The provision of a liftable carriage facilitates the placement of the container 14, ensuring that the level of the liquid in the container is beyond the friction area 8 of the yarn. In another embodiment, the bracket 15 is integrally formed with the fixed plate body 1.
The testing device further comprises an automatic detection system, wherein the automatic detection system comprises a display device 17 for parameter setting and displaying the friction coefficient change condition in the yarn friction process in real time, a detection element 18 for detecting the friction cycle times of a yarn twisting friction area, a photoelectric switch 19 for detecting a counterweight, and a controller. An input tension sensor 20 and an output tension sensor 21 for detecting input and output tension are provided in the input yarn guide pulley group 3 and the output yarn guide pulley group 5, respectively. And when the photoelectric switch detects the counterweight, a detection signal is sent to the controller, and the controller sends a signal for stopping the motor to the motor. The controller is a PLC controller, the detection element adopts an infrared counter, when two port yarns of the device are rubbed to break, the photoelectric switch sends detection signals to the controller after detecting the counter weight, and the controller sends signals for stopping counting by the infrared counter to the infrared counter. Wherein, the yarn is subjected to a friction cycle for every revolution of the fixing member 10, and the infrared counter counts once.
Parameters that the display device 17 can set include motor frequency, weight of the counterweight, experimental sample information, and the like. The values detected by the infrared counter at the test end, the real-time tension of the yarn input end and the yarn output end, and the static and dynamic friction coefficients are displayed on the display device 17. The display device 17 may be in signal connection with the controller by wired or wireless means.
The controller processes the values detected by the input tension sensor 20 and the output tension sensor 21 by using a previously written calculation program. For example, the operation procedure includes the following operation procedures: t2=maximum value-minimum value is calculated from the tension sensor detection value, using the following formula: μs (coefficient of friction) =ln ((T2- Δt/2)/t1+Δt/2))/2n, the coefficient of friction μs of the elastic fiber surface is calculated, but the mathematical model calculated from the data processing detected by the tension sensor is not limited to the example.
The invention also provides an application of the testing device with the functions of detecting the friction coefficient and friction fatigue among yarns in representing the wear-resisting effect and the firmness of the coating on the surface of the yarns.
The invention can test the friction coefficient and the friction fatigue property of the yarn after being treated by coating and the like besides the conventional test of the friction coefficient and the friction fatigue property of the yarn.
The dry friction refers to the friction coefficient and friction fatigue between yarns obtained by a testing device under the atmospheric environment condition. The wet coefficient of friction and friction fatigue are achieved by placing a beaker containing water or other liquid under the test end. The level of water or other liquid in the beaker is above the yarn twisting friction zone. The specific beaker is placed on the bracket 16, and the bracket 16 can be adjusted up and down, so that the placement of the beaker is convenient, and the liquid level of the liquid in the beaker is ensured to exceed the friction area.
The specific steps of the yarn-yarn friction coefficient and friction fatigue test experiment are as follows: (1) Measuring the fineness of the yarns, and calculating the weight of the counterweight according to the standard and experimental requirements; (2) The steel balls are added into the pockets, so that the counterweight meets the corresponding weight requirement; (3) Fixing the yarn to be tested on the fixing piece 10 in a section, sequentially bypassing the input yarn guiding wheel set 3, the steering yarn guiding wheel 4 and the output yarn guiding wheel set 5 according to the test mode, and twisting the yarn according to the requirements in a friction area; (4) Tying the other end of the yarn to the counterweight 6, if the friction coefficient and the friction fatigue performance in a wet state need to be measured, placing a beaker containing purified water on the bracket 16, and moving the bracket 16 upwards so that the water surface is beyond the twisting friction area 8; (5) setting a test frequency; (6) starting the test until the yarn breaks; (7) recording the number of yarn breaks; (8) The change in tension during friction is recorded and the coefficient of friction is calculated.
In this example, the fiber dry yarn and yarn friction fatigue performance was tested:
the fineness of the yarns is measured by respectively measuring HMPE fibers, nylon fibers and polyester fibers and is determined according to the standard of 25 mN/tex. The yarn to be measured is fixed on the fixing piece 10 in a section, the other end sequentially bypasses the input yarn guiding wheel set 3, the steering yarn guiding wheel 4, the yarn guiding wheel of the output yarn guiding wheel set 5 and the sensor, and is twisted for 3 circles in a friction area according to requirements. The other end of the yarn 2 is tied to the weight 6, and the fall arrest line is tied to the fall arrest hook and the weight 6. The test frequency was set at 1Hz. The test was started until the yarn was broken and the number of yarn breaks was recorded.
TABLE 1 Friction fatigue of different fiber yarns in dry state
| Raw materials | Linear density (D) | Weight per unit fineness (mN/tex) | Weight of balance weight (g) | Number of fatigue times |
| HMPE | 1611 | 25 | 457 | 6593 |
| Kevlar | 1468 | 25 | 416 | 1127 |
| nylon | 1629 | 25 | 462 | 5243 |
| ET | 3056 | 25 | 866 | 5360 |
Example 2
The same points as those of the embodiment 1 are not repeated, and the difference is that the embodiment tests the friction fatigue performance of the wet state fiber yarn and the yarn:
the fineness of the yarns is measured by respectively measuring HMPE fibers, nylon fibers and polyester fibers and is determined according to the standard of 60 mN/tex. The yarn to be measured is fixed on the fixing piece 10 in a section, the other end sequentially bypasses the input yarn guiding wheel set 3, the steering yarn guiding wheel 4, the yarn guiding wheel of the output yarn guiding wheel set 5 and the sensor, and is twisted for 3 circles in a friction area according to requirements. The other end of the yarn is tied to the counterweight 6 and the fall arrest line is tied to the fall arrest hook and the counterweight 6. A beaker containing purified water is placed on the carriage 16 and the carriage 16 is moved upwards so that the water surface is above the twisting friction zone 8. The test frequency was set at 0.5Hz. The test was started until the yarn was broken and the number of yarn breaks was recorded.
TABLE 2 Friction fatigue of different fiber yarns in wet state
| Raw materials | Linear density (D) | Weight per unit fineness (mN/tex) | Weight of balance weight (g) | Number of fatigue times |
| HMPE | 1611 | 60 | 1096 | 3896 |
| Kevlar | 1468 | 60 | 999 | 103 |
| nylon | 1629 | 60 | 1108 | 6223 |
| PET | 3056 | 60 | 2079 | 1144 |
Example 3
The points of the dry fiber yarn and the yarn friction coefficient are tested in this example, which are the same as those in examples 1 and 2, and are not described in detail:
the fineness of the yarns is measured by respectively measuring HMPE fibers, nylon fibers and polyester fibers and is determined according to the standard of 25 mN/tex. The yarn to be measured is fixed on the fixing piece 10 in a section, the other end sequentially bypasses the input yarn guiding wheel set 3, the steering yarn guiding wheel 4 and the output yarn guiding wheel set 5 yarn guiding wheel and the sensor, and is twisted for 2 circles in a friction area according to requirements. The other end of the yarn is tied to the counterweight 6 and the fall arrest line is tied to the fall arrest hook and the counterweight 6. The test frequency was set at 0.5Hz. The test was started until the yarn broke, and the change in coefficient of friction was recorded.
TABLE 3 coefficient of friction of different fiber yarns in dry state
Example 4
The points identical to those of examples 1, 2 and 3 are not repeated, and the difference is that the friction coefficient between the wet yarn and the yarn is tested in this example:
the fineness of the yarns is measured by respectively measuring HMPE fibers, nylon fibers and polyester fibers and is determined according to the standard of 60 mN/tex. The yarn to be measured is fixed on the fixing piece 10 in a section, the other end sequentially bypasses the input yarn guiding wheel set 3, the steering yarn guiding wheel 4, the yarn guiding wheel of the output yarn guiding wheel set 5 and the sensor, and is twisted for 3 circles in a friction area according to requirements. The other end of the yarn is tied to the counterweight 6 and the fall arrest line is tied to the fall arrest hook and the counterweight 6. The beaker containing purified water is placed on the carriage 16 and the carriage is moved upwards so that the water surface is above the twisting friction zone 8. The test frequency was set at 0.5Hz. The test was started until the yarn broke, and the change in coefficient of friction was recorded.
TABLE 4 coefficient of friction of different fiber yarns in dry state
According to the invention, the driving assembly with the eccentric structure is arranged, the specific motor drives the fixing piece 10 to rotate, so that the yarn fixed on the fixing piece realizes reciprocating friction of the yarn in the yarn twisting friction area according to the guidance of the yarn guiding wheel, thereby realizing friction fatigue of the yarn and the yarn, and tension sensors are arranged at two ends of the yarn friction area to monitor the yarn tension, so as to realize the test of the friction coefficient of the yarn and the yarn. The friction frequency can be changed by adjusting the rotation frequency of the motor; friction under different tension can be realized by adjusting the mass of the counterweight. The yarn friction times are counted by scanning an internal infrared counter, and relevant information such as tension of input and output ends of a friction area, friction frequency and the like is stored and displayed in a display device. The invention has the characteristics of high test precision, stable and reliable working performance, repeatable operation, simple operation, wide applicability and the like.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a have testing arrangement that friction coefficient and friction fatigue detected between yarn concurrently, includes the fixed plate body, is provided with the input yarn guide wheel group that the yarn passed through in proper order of being convenient for of yarn along the length direction of fixed plate body for the yarn direction turns to the yarn guide wheel, and the output yarn guide wheel group is provided with the drive assembly and the counter weight that are used for driving yarn operation that are connected with the fixed plate body respectively at the both ends of yarn, its characterized in that: the testing device also comprises an adjusting yarn guide roller assembly which is arranged right above the steering yarn guide wheel and used for eliminating yarn tension fluctuation so as to ensure tension balance of the yarns, and the driving assembly is an eccentric structure which can drive the yarns in a twisting friction area formed after the yarns are twisted to continuously and oppositely run and rub; the automatic detection system comprises display equipment for parameter setting and displaying friction coefficient change conditions in the yarn friction process in real time, a detection element for detecting friction cycle times of a yarn twisting friction area, a photoelectric switch for detecting a counterweight, a tension sensor and a controller, wherein the photoelectric switch sends a detection signal to the controller after detecting the counterweight, and the controller sends a signal for stopping driving of a driving assembly to the driving assembly;
the driving assembly comprises a rotary table rotationally connected with the fixed plate body, a fixing piece fixedly connected with the end part of the yarn and a motor for driving the rotary table to rotate are eccentrically arranged on the rotary table, and the fixing piece is fixedly connected with the rotary table;
the adjusting yarn guide roller assembly comprises a left yarn guide roller and a right yarn guide roller which is tangential to one side of the left yarn guide roller, and the tangential part of the left yarn guide roller and the right yarn guide roller is the central part of the steering yarn guide wheel, so that the influence of swing fluctuation of the output end and the input end of yarns on the balance of friction force can be eliminated;
the fixing plate body is provided with a containing cavity, a container for containing solution when wet friction is carried out on yarns in a twisting friction area is arranged in the containing cavity, and a bracket which is used for fixing a steering yarn guiding wheel and can be placed in the container is arranged at the top of the containing cavity and is fixedly connected with the fixing plate body;
the bottom of the accommodating cavity is provided with a bracket for supporting the container to realize lifting of the container in the accommodating cavity.
2. The test device with both inter-yarn friction coefficient and friction fatigue detection according to claim 1, wherein: the controller is a PLC controller, the detection element comprises an infrared counter, a detection signal is sent to the controller after the photoelectric switch detects the counterweight, and the controller sends a signal for stopping counting by the infrared counter to the infrared counter.
3. The test device with both inter-yarn friction coefficient and friction fatigue detection according to claim 1, wherein: the yarn twisting friction area is self twisting, and the number of turns of twisting is 2-5.
4. The test device with both inter-yarn friction coefficient and friction fatigue detection according to claim 2, wherein: the weight of the counterweight can be adjusted according to the fineness of the yarns, the counterweight is 10-100mN/tex, and the weight precision of the counterweight is 0.001g.
5. The test device with both inter-yarn friction coefficient and friction fatigue detection according to claim 4, wherein: the motor is a servo motor, and the rotation frequency of the servo motor is 0.01-2Hz.
6. Use of a test device according to any one of claims 1-5 for characterizing the abrasion resistance and the firmness of a coating on a yarn surface, in combination with the detection of the friction coefficient and the friction fatigue between yarns.
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| CN113933154B (en) * | 2021-10-12 | 2024-05-24 | 泰山玻璃纤维邹城有限公司 | Electronic grade glass fiber brittleness test device and test method |
| CN114002099A (en) * | 2021-11-01 | 2022-02-01 | 山东黄河三角洲纺织科技研究院有限公司 | Carbon nanotube coating conductive yarn rubbing fastness test equipment and test method |
| CN114674698B (en) * | 2022-05-26 | 2022-08-12 | 南通禾欧服饰有限公司 | Yarn performance testing device |
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