CN213041666U - Testing device - Google Patents
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- CN213041666U CN213041666U CN202022224064.3U CN202022224064U CN213041666U CN 213041666 U CN213041666 U CN 213041666U CN 202022224064 U CN202022224064 U CN 202022224064U CN 213041666 U CN213041666 U CN 213041666U
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Abstract
The utility model discloses a testing device, which comprises a bracket; the yarn winding device comprises at least one group of testing components, wherein each testing component comprises a movable rod capable of reciprocating and at least three fixed pulleys fixed on a support, the circle centers of the at least three fixed pulleys are not in the same straight line, and yarns can be sequentially connected with the fixed pulleys after being connected with the movable rods to form a winding part; a tension applying mechanism connected to the yarn; and a counting device. One end of the yarn is connected with the movable rod, the other end of the yarn is connected with the tension applying mechanism, and the middle part of the yarn is sequentially connected with the fixed pulley to form a winding part; under the double action of the reciprocating motion of the movable rod and the tension applying mechanism, reciprocating friction is generated between yarns forming the winding part, and the counting device counts until the yarns are worn and broken. Therefore, use the utility model provides a testing arrangement can effectively simulate the friction condition between inside yarn of rope and the yarn of rope among the cable in-service use, and then tests the internal friction of fibre rope.
Description
Technical Field
The utility model relates to a test technical field, in particular to testing arrangement.
Background
The service life of the rope is closely related to the wear resistance of the fiber used for weaving the rope, the weaving structure of the rope, the coating of the rope and other factors. The wear resistance of the fibers used for weaving the cable is particularly important, and the friction of the fiber cable is mainly reflected in internal friction (friction between yarns) and external friction (friction between yarns and contact objects) in the using process.
At present, most of the wear resistance testing devices sold on the market can only be used for testing the external friction (the friction between yarns and contact objects) of the fiber ropes, and no testing device is generally applicable to the internal friction (the friction between yarns) of the fiber ropes.
Therefore, how to design a testing device for detecting the internal friction of the fiber cable, which is generally applicable, is a technical problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a testing arrangement to the inside friction of test fiber rope.
In order to achieve the above object, the utility model provides a testing device for the yarn that awaits measuring, include:
a support;
the test assembly comprises a movable rod capable of reciprocating in a first direction and at least three fixed pulleys fixed on the support, the circle centers of the fixed pulleys are not on the same straight line, and the yarn to be tested can be connected with the movable rod and then sequentially connected with the fixed pulleys to form a winding part;
the tension applying mechanism is connected to one end, far away from the movable rod, of the yarn to be measured; and
and the counting device is used for counting the reciprocating stroke times of the movable rod.
Preferably, in the above test apparatus, the number of the fixed pulleys is three, and the fixed pulleys are a first fixed pulley, a second fixed pulley and a third fixed pulley;
the connecting line between the circle center of the first fixed pulley and the circle center of the second fixed pulley is parallel to the first direction, the third fixed pulley is arranged on one side, away from the movable rod, of the first fixed pulley, and the circle center of the third fixed pulley is positioned on the perpendicular bisector of the connecting line between the circle center of the first fixed pulley and the circle center of the second fixed pulley.
Preferably, in the above testing device, a connecting piece for connecting the tension applying mechanism is provided at an end of the yarn to be tested away from the movable rod.
Preferably, in the above test apparatus, the counting device includes a counting sensor provided to the connecting member and a display for displaying the number of reciprocating strokes of the movable rod.
Preferably, in the above test apparatus, the counting apparatus further comprises a reset switch capable of resetting the display.
Preferably, in the above test apparatus, the movable rod is a long strip-shaped structure, and the movable rod is provided with at least one connecting hole for connecting the yarn to be tested.
Preferably, in the above test device, the test device further includes rollers disposed on both sides of the movable rod and a rail disposed below the rollers, and the rollers can reciprocally roll along the rail in the first direction.
Preferably, in the above test device, the test device further includes a driving device for driving the roller to rotate, and a start button and a stop button for controlling the driving device.
Preferably, in the above test apparatus, the bracket is provided with a fixed shaft for mounting the fixed pulley, and a bearing is provided between the fixed pulley and the fixed shaft.
Preferably, in the above test apparatus, the tension applied to the yarn to be tested by the tension applying mechanism is adjustable.
When the testing device provided by the utility model is used, one end of the yarn to be tested is connected with the movable rod which can do reciprocating motion in the first direction, the other end is connected with the tension applying mechanism so as to apply preset tension to the yarn to be tested, and the middle part of the yarn to be tested is sequentially connected with at least three fixed pulleys which are not on the same straight line and form a winding part; under the double action of the reciprocating motion of the movable rod and the tension applying mechanism, reciprocating friction is generated between the yarn to be detected and the yarn to be detected, which form the winding part, until the yarn to be detected of the winding part is worn and broken, the counting device counts the reciprocating stroke frequency of the movable rod in the reciprocating friction process of the yarn to be detected and the yarn to be detected until the yarn to be detected of the winding part is worn and broken, and the reciprocating stroke frequency of the movable rod is the mutual friction stroke frequency between the yarns to be detected and the winding part. Therefore, use the utility model provides a testing arrangement can effectively simulate the friction condition between inside yarn of rope and the yarn of rope among the cable in-service use, and then test the internal friction of fibre rope to this testing arrangement simple structure has universal applicability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a testing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a testing assembly according to an embodiment of the present invention.
The device comprises a support 100, a test assembly 200, a movable rod 201, a connecting hole 2011, a roller 2012, a track 2013, a fixed pulley 202, a first fixed pulley 2021, a second fixed pulley 2022, a third fixed pulley 2023, a tension applying mechanism 300, a connecting piece 301, a counting device 400, a display 401, a counting sensor 402, a reset switch 403, a yarn to be tested 500, a winding portion 501, a driving device 600, a start button 601, and a stop button 602.
Detailed Description
In view of this, the core of the present invention is to provide a testing device for testing the internal friction of a fiber cable.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1 to 2, the present invention discloses a testing device for testing a yarn 500, which comprises a support 100, at least one set of testing components 200, a tension applying mechanism 300 and at least one counting device 400.
The testing assembly 200 is arranged on the support 100, the testing assembly 200 comprises a movable rod 201 capable of reciprocating in a first direction and at least three fixed pulleys 202 fixed on the support 100, the circle centers of the at least three fixed pulleys 202 are not on the same straight line, and a yarn 500 to be tested can be connected with the fixed pulleys 202 in sequence after being connected with the movable rod 201 to form a winding part 501;
the tension applying mechanism 300 is connected to one end of the yarn 500 to be measured away from the movable rod 201;
the counting means 400 is used to count the number of reciprocating strokes of the movable rod 201.
When the testing device provided by the utility model is used, one end of the yarn 500 to be tested is connected with the movable rod 201 which can do reciprocating motion in the first direction, the other end is connected with the tension applying mechanism 300, so that the predetermined tension can be applied to the yarn 500 to be tested, and the middle part of the yarn 500 to be tested is sequentially connected with at least three fixed pulleys 202 which are not in the same straight line and form a winding part 501; under the double action of the reciprocating motion of the movable rod 201 and the tension applying mechanism 300, reciprocating friction is generated between the yarn 500 to be measured constituting the winding part 501 and the yarn 500 to be measured until the yarn 500 to be measured of the winding part 501 is worn and broken, the counting device 400 counts the reciprocating stroke number of the movable rod 201 in the reciprocating friction process of the yarn 500 to be measured and the yarn 500 to be measured until the yarn 500 to be measured of the winding part 501 is worn and broken, and the reciprocating stroke number of the movable rod 201 in the first direction is the mutual friction stroke number between the yarns 500 to be measured constituting the winding part 501. Therefore, use the utility model provides a testing arrangement can effectively simulate rope in-service use the inside yarn 500 that awaits measuring of rope and the friction condition between the yarn 500 that awaits measuring, and then the internal friction of test fibre rope.
It should be noted that, the limit positions of the movable rod 201 that reciprocates to both sides are the first dead point and the second dead point, respectively, and the process that the movable rod 201 moves from the first dead point to the second dead point and then returns to the first dead point, or the process that the movable rod 201 moves from any initial position and returns to the initial position after passing through the first dead point and the second dead point is 1 reciprocating stroke.
The number of the test assemblies 200 provided by the present invention can be 1, 2 or 6, and the number of the test assemblies as long as the number can meet the test requirement is within the protection scope of the present invention; preferably, the testing device provided by the embodiment of the present invention includes 12 testing assemblies 200, and can simultaneously test the internal friction of 12 sets of yarns 500 to be tested.
Moreover, the counting device 400 may be one, when the yarn 500 to be tested on one testing component 200 of the plurality of testing components 200 is worn and broken, after the worker records the number displayed by the counting device 400, the worker continues to test the yarn 500 to be tested on the other testing components 200, and then records the number when the yarn 500 to be tested is worn and broken successively until the yarn 500 to be tested on all the testing components 200 is worn and broken; the number of the counting devices 400 can also be multiple, each testing component 200 corresponds to one counting device 400, and the counting devices 400 only record the reciprocating stroke times of the movable rods 201 when the yarn 500 to be tested on the corresponding testing component 200 is broken and worn; preferably, the counting device 400 provided by the embodiment of the present invention is plural, and each testing component 200 corresponds to one counting device 400, so that the labor cost can be saved.
In addition, the fixed pulleys 202 not in the same straight line can be randomly arranged, arranged in a polygon or arranged in an array, and the like, and the arrangement form that the yarn 500 to be measured is sequentially connected with at least three fixed pulleys 202 not in the same straight line to form the winding part 501 belongs to the protection scope of the utility model; preferably, the testing assembly 200 provided by the embodiment of the present invention includes three fixed pulleys 202, namely a first fixed pulley 2021, a second fixed pulley 2022 and a third fixed pulley 2023, wherein the first fixed pulley 2021, the second fixed pulley 2022 and the third fixed pulley 2023 are arranged in a triangle.
Specifically, a connection line between a circle center of the first fixed pulley 2021 and a circle center of the second fixed pulley 2022 is parallel to the first direction, the third fixed pulley 2023 is disposed on a side of the first fixed pulley 2021 away from the movable rod 201, and a circle center of the third fixed pulley 2023 is located on a perpendicular bisector of the connection line between the circle center of the first fixed pulley 2021 and the circle center of the second fixed pulley 2022, so that the yarn 500 to be measured is sequentially wound around the first fixed pulley 2021 and the third fixed pulley 2023, and then wound over the third fixed pulley 2023 to form the winding portion 501, and then wound around the second fixed pulley 2022.
It should be noted that, the present invention does not limit the distance between the first fixed pulley 2021, the second fixed pulley 2022 and the third fixed pulley 2023, and all distances that can satisfy the testing requirement are within the protection scope of the present invention; preferably, the center distance between the first fixed pulley 2021 and the second fixed pulley 2022 provided by the embodiment of the present invention is 140 ± 2mm, and the distance between the center of the third fixed pulley and the line connecting the centers of the first fixed pulley 2021 and the second fixed pulley 2022 is 254 ± 2 mm.
In addition, the diameters of the first fixed pulley 2021, the second fixed pulley 2022 and the third fixed pulley 2023 may be equal or unequal, and the fixed pulley 202 that can meet the use requirement is within the protection scope of the present invention; preferably, the diameters of the plurality of fixed pulleys 202 provided by the embodiment of the present invention are all equal, so as to facilitate the generalization of the components.
As shown in fig. 2, the end of the yarn 500 to be measured away from the movable rod 201 is provided with a connecting member 301 to connect the tension applying mechanism 300.
It should be noted that the tension applying mechanism 300 provided in the embodiment of the present invention can be connected with the yarn 500 to be measured through the connecting piece 301, but not only limited to the connecting piece 301, and the yarn 500 to be measured can also be directly connected with the tension applying mechanism 300, as long as the connection mode can connect the tension applying mechanism 300 and the yarn 500 to be measured, all belong to the protection scope of the present invention.
In addition, the connecting member 301 may be a disc, a strip, or a square, and the like, and any structure capable of connecting the tension applying mechanism 300 and the yarn 500 to be measured is within the protection scope of the present invention; preferably, the connecting member 301 provided by the embodiment of the present invention is a plate-shaped structure, and the connecting member 301 is provided with a hole for fixing the yarn 500 to be measured.
Further, the counting means 400 includes a counting sensor 402 for counting the number of reciprocating times of the movable bar 201, and a display 401 for displaying the number of reciprocating strokes of the movable bar 201.
The counting sensor 402 may be provided in any component such as the holder 100, the movable rod 201, or the link 301, as long as it can count the number of reciprocating strokes of the movable rod 201; preferably, the counting sensor 402 provided by the embodiment of the present invention is disposed on the connecting member 301, and the number of times of the up-down stroke of the connecting member 301 is equal to the number of times of the reciprocating stroke of the movable rod 201 in the first direction, that is, the number of times of the reciprocating stroke of the movable rod 201 in the first direction can be obtained by counting the number of times of the up-down stroke of the connecting member 301.
In addition, the counting sensor 402 can be a photoelectric sensor, a hall sensor, an infrared counting sensor, etc., and all the sensors that can count the reciprocating stroke frequency of the movable rod 201 belong to the protection scope of the present invention.
The embodiment of the utility model provides a counting assembly 400 still includes reset switch 403 to make the reciprocal stroke number that display 401 shows reset, count again the yarn 500 that awaits measuring of follow-up examination of awaiting measuring.
Further, the movable rod 201 is a long strip-shaped structure, and at least one connection hole 2011 is formed in the movable rod 201 and used for connecting the yarn 500 to be measured.
It should be noted that, the connecting hole 2011 for connecting the yarn 500 to be measured is not limited to the connecting hole 2011, but may also be a connecting rod, a connecting hook, a connecting ring, or the like disposed on the movable rod 201, as long as the structure capable of connecting the yarn 500 to be measured all belongs to the protection scope of the present invention.
As shown in fig. 1, the testing device further includes rollers 2012 disposed at two sides of the movable rod 201 and a rail 2013 disposed below the rollers 2012, and the rollers 2012 can reciprocally roll along the rail 2013 in the first direction, so as to drive the movable rod 201 to reciprocally move in the first direction, so that friction occurs between the yarns 500 to be tested forming the winding portion 501.
The embodiment of the utility model provides a gyro wheel 2012 can be U type sheave, V type sheave or H type sheave etc. as long as can follow track 2013 and all belong to at the gyro wheel of first direction reciprocating roll the utility model discloses protection scope.
Further, the testing device further comprises a driving device 600, a start button 601 and a stop button 602; the driving device 600 is used for driving the roller 2012 to rotate, and the start button 601 and the stop button 602 are used for controlling the start and stop of the driving device 600.
It should be noted that the driving device 600 may be a synchronous motor, a speed reduction motor, or an engine, and all devices that can drive the roller 2012 to rotate belong to the protection scope of the present invention; preferably, the driving device 600 provided by the embodiment of the present invention is a synchronous motor.
The driving device 600 is connected with the roller 2012 through a connecting rod, and the length of the reciprocating stroke of the roller 2012 can be adjusted by adjusting the length of the connecting rod, so as to adjust the length of the reciprocating stroke of the movable rod 201; the utility model does not limit the length of the reciprocating stroke of the movable rod 201, and the length of the reciprocating stroke which can meet the test requirement is within the protection scope of the utility model; preferably, the length of the reciprocating stroke of the movable rod 201 provided by the embodiment of the present invention is between 30mm and 80 mm.
In addition, the reciprocating frequency of the movable rod 201 can be adjusted by adjusting the rotating speed of the driving device 600, the reciprocating frequency of the movable rod 201 is not limited by the utility model, and the reciprocating frequency which can meet the test requirement is within the protection scope of the utility model; preferably, the reciprocating frequency of the movable rod 201 provided by the embodiment of the present invention is 30-150 times/min.
Further, a fixed shaft for mounting the fixed pulley 202 is arranged on the bracket 100, and a bearing is arranged between the fixed pulley 202 and the fixed shaft, so that friction between the fixed pulley 202 and the fixed shaft is reduced in the test process, and smooth test is ensured.
The bearing may be a tapered roller bearing, a double row deep groove ball bearing, a thrust ball bearing, or the like, as long as friction between the fixed pulley 202 and the fixed shaft during the test can be reduced.
When the tension applying mechanism 300 of the present invention is used, the tension applied by the tension applying mechanism 300 is configured according to 1% -5% of the breaking strength of the yarn 500 to be measured. The utility model provides a tension applying mechanism 300 can adjust the tension that awaits measuring yarn 500 was applyed to in the test demand of the yarn of satisfying different materials.
Moreover, the tension applying mechanism 300 may be a weight-adjustable component such as a heavy hammer, an iron block or a weight, or a tension controller capable of automatically adjusting tension, and any mechanism capable of adjusting tension of the yarn 500 to be measured is within the protection scope of the present invention; preferably, you should adopt spare part of adjustable weight, simple structure, convenient to manufacture with novel embodiment.
As shown in fig. 1, in the testing device according to the embodiment of the present invention, when in use, one end of the yarn 500 to be tested is connected to the connecting hole 2011 of the movable rod 201, and sequentially wound around the first fixed pulley 2021 and the third fixed pulley 2023, the yarn 500 to be tested located at two sides of the third fixed pulley 2023 is wound three times above the third fixed pulley 2023, so as to form a winding angle of 360 ° × 3 ═ 1080 °, the yarn 500 to be measured far away from one end of the connecting hole 2011 is wound on the second fixed pulley 2022, the tail end of the yarn 500 to be measured is connected with the tension applying mechanism 300 through the connecting piece 301, the tension applying mechanism 300 is configured according to 1% -5% of the breaking strength of the yarn 500 to be measured, the diameters of the first fixed pulley 2021, the second fixed pulley 2022 and the third fixed pulley 2023 are all 25.4mm, the center distance between the first fixed pulley 2021 and the second fixed pulley 2022 is 140mm, and the center of the third fixed pulley 2023 is 254mm below the midpoint of the line connecting the centers of the first fixed pulley 2021 and the second fixed pulley 2022; the driving device 600 is started through the starting button 601, the driving device 600 drives the roller 2012 to do reciprocating motion in the first direction through the connecting rod, the movable rod 201 further does reciprocating motion in the first direction, the length of the reciprocating stroke of the movable rod 201 is 50 +/-4 mm, the reciprocating motion frequency is 60 times/min, the counting sensor 402 counts the up-down stroke frequency of the yarn 500 to be tested connected with one end of the tension applying mechanism 300, the up-down stroke frequency is displayed on the display 401, the number is equal to the reciprocating stroke frequency of the movable rod 201 in the first direction until the yarn 500 to be tested is worn and broken, the counting device 400 does not count again, the driving device 600 is closed through the stopping button 602, and the display 401 keeps the recorded reciprocating stroke frequency until the reset switch 403 is pressed to reset the display 401, and preparation is continuously made for subsequent tests.
It should be noted that the testing device provided by the utility model can be used for testing the dry yarn wear resistance under dry condition, and can also be used for testing the wet yarn wear resistance under wet condition; when testing the wear resistance of the dry yarn, the testing device is placed in an environment with the relative humidity of 55-75% and the temperature of 16-25 ℃ for testing; when testing the wear resistance of the wet yarn, the winding part 501 formed by the fixed pulley 202 and the yarn 500 to be tested is completely immersed in fresh water, and the temperature is controlled to be 16-25 degrees for testing.
The terms "first" and "second," and the like in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include steps or elements not listed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A testing device for a yarn (500) to be tested, comprising:
a bracket (100);
the test assembly (200) comprises a movable rod (201) capable of reciprocating in a first direction and at least three fixed pulleys (202) fixed to the support (100), the circle centers of the at least three fixed pulleys (202) are not on the same straight line, and the yarn (500) to be tested can be connected with the fixed pulleys (202) in sequence after being connected with the movable rod (201) to form a winding part (501);
the tension applying mechanism (300) is connected to one end, far away from the movable rod (201), of the yarn (500) to be tested; and
a counting device (400) for counting the reciprocating stroke times of the movable rod (201).
2. The testing device according to claim 1, characterized in that the number of the fixed pulleys (202) is three, respectively a first fixed pulley (2021), a second fixed pulley (2022) and a third fixed pulley (2023);
the connecting line between the circle center of the first fixed pulley (2021) and the circle center of the second fixed pulley (2022) is parallel to the first direction, the third fixed pulley (2023) is arranged on one side of the first fixed pulley (2021) far away from the movable rod (201), and the circle center of the third fixed pulley (2023) is positioned on the perpendicular bisector of the connecting line between the circle center of the first fixed pulley (2021) and the circle center of the second fixed pulley (2022).
3. The testing device according to claim 1, characterized in that the end of the yarn (500) to be tested remote from the movable bar (201) is provided with a connection member (301) for connecting the tension applying mechanism (300).
4. A testing device according to claim 3, wherein the counting device (400) comprises a counting sensor (402) arranged at the connecting member (301) and a display (401) for displaying the number of reciprocating strokes of the movable rod (201).
5. A test device according to claim 4, wherein the counting device (400) further comprises a reset switch (403) capable of resetting the display (401).
6. The testing device according to claim 1, characterized in that the movable rod (201) has a strip-shaped structure, and the movable rod (201) is provided with at least one connecting hole (2011) for connecting the yarn (500) to be tested.
7. The testing device according to claim 1, further comprising rollers (2012) disposed on both sides of the movable bar (201) and a track (2013) disposed below the rollers (2012), the rollers (2012) being reciprocally rollable along the track (2013) in the first direction.
8. The testing device according to claim 7, characterized in that it further comprises a drive device (600) for driving the roller (2012) in rotation, a start button (601) and a stop button (602) for controlling the drive device (600).
9. The testing device according to claim 1, wherein a fixed shaft for mounting the fixed pulley (202) is arranged on the bracket (100), and a bearing is arranged between the fixed pulley (202) and the fixed shaft.
10. The testing device according to claim 1, characterized in that the tension applied by the tension applying mechanism (300) to the yarn (500) to be tested is adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022224064.3U CN213041666U (en) | 2020-09-30 | 2020-09-30 | Testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022224064.3U CN213041666U (en) | 2020-09-30 | 2020-09-30 | Testing device |
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| CN213041666U true CN213041666U (en) | 2021-04-23 |
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| CN202022224064.3U Active CN213041666U (en) | 2020-09-30 | 2020-09-30 | Testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358556A (en) * | 2021-06-11 | 2021-09-07 | 青岛大学 | Testing device with yarn friction coefficient and friction fatigue detection functions and application |
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2020
- 2020-09-30 CN CN202022224064.3U patent/CN213041666U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358556A (en) * | 2021-06-11 | 2021-09-07 | 青岛大学 | Testing device with yarn friction coefficient and friction fatigue detection functions and application |
| CN113358556B (en) * | 2021-06-11 | 2023-06-23 | 青岛大学 | Testing device with inter-yarn friction coefficient and friction fatigue detection functions and application |
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