A yarn clamping device

Abstract

This invention discloses a yarn clamping device, belonging to the technical field of yarn equipment. The device has a base with a through-hole in the center. A first platform and a second platform are located on the upper end of the base. Limiting grooves are provided on both sides of the first platform, and a first magnetic column is installed in each groove. The second platform has a corresponding second magnetic column that magnetically engages with it. The first platform also has an alignment groove to ensure accurate clamping and positioning. The device adds a rotatable wheel with a curved receiving cavity, which, together with a limiting boss and an anti-slip structure, enables angle adjustment and prevents detachment. Anti-slip elements can be added to the contact surface of the magnetic column to improve clamping stability. This invention uses a magnetic clamping method to fix the yarn. It features a simple structure, quick assembly and disassembly, accurate positioning, and reliable clamping, solving the problems of cumbersome operation, large alignment deviations, and easy loosening of traditional devices. It is suitable for various yarn processing positioning and clamping scenarios and has good practicality.

Description

Technical Field

[0001] This invention relates to the field of yarn equipment technology, specifically to a yarn clamping device. Background Technology

[0002] Current common methods for yarn fineness testing include weighing and photoelectric image measurement. The weighing method involves cutting a certain length of yarn, drying it, weighing it, and then calculating its fineness. However, it is not easy to measure when the yarn length is short. Short yarns can be tested using optical methods, where a lens captures the cross-section of the yarn and measures its diameter. However, this method has significant drawbacks: the yarn is fluffy, fuzzy, and prone to curling in its natural state, resulting in poor testing accuracy. Manual hand-held operation is also inconvenient. For untwisted chemical filaments, manual twisting is required, which is difficult to operate and has low testing efficiency. Summary of the Invention

[0003] To solve the problem of yarn clamping, this invention proposes a yarn clamping device. The device includes a base with a central through-hole extending along its thickness. A first platform is connected to the upper surface of the base around the central through-hole. A first limiting groove and a second limiting groove are parallel to each other on the upper surface of the first platform, located on opposite sides of the central through-hole. A second platform is also connected to the upper surface of the base, and the second platform is connected to the front side of the first platform. The height of the second platform is level with and connected to the lower surfaces of the first and second limiting grooves. A first magnetic column is connected within the first and second limiting grooves, and the first magnetic column magnetically attracts and connects to a second magnetic column. The second magnetic column is located on the second platform, and its length is greater than that of the second platform. Two grooves are symmetrically arranged on both sides of the through-hole of the first platform. The magnetic surfaces of the first and second magnetic columns on both sides of the central through-hole are collinear with the two grooves.

[0004] Furthermore, the upper surface of the first platform of the base is provided with a first limiting groove, and the end away from the first limiting groove is provided with a receiving cavity. A rotating wheel adapted to the receiving cavity is movably connected in the receiving cavity. The rotating wheel includes a rotating end away from the central through hole and a connecting end near the central through hole. The connecting end includes a stepped third platform and a fourth platform. The side of the third platform near the central through hole is provided with a second limiting groove. The second limiting groove is parallel to the first limiting groove. The lower end surface of the cross-section of the second limiting groove is provided with a support platform of the same height as it. The height of the support platform is higher than that of the fourth platform. A first magnetic column is connected in the second limiting groove. The first magnetic column is magnetically attracted to a second magnetic column. The second magnetic column is located on the support platform, and the length of the second magnetic column is greater than that of the second platform. The magnetic surfaces of the first and second magnetic columns on both sides of the central through hole are collinear with the two grooves. By rotating the rotating end, the rotating wheel can rotate axially in the receiving cavity.

[0005] Furthermore, the receiving cavity is an arc-shaped receiving cavity; the rotating end is cylindrical and adapted to its size.

[0006] Furthermore, a limiting boss is provided inside the receiving cavity, and the height of the cavity surface at the end away from the central through hole is less than the height of the cavity surface at the end closer to the central through hole; the rotating end is provided with a limiting groove adapted to the limiting boss.

[0007] Furthermore, the outer edge of the rotating end is provided with anti-slip parts or anti-slip threads.

[0008] Furthermore, the first limiting groove and the second limiting groove are arc-shaped limiting grooves, and their cross-sections are superior arc shapes with a central angle greater than 180°.

[0009] Furthermore, the length of the first magnetic column is the same as the length of the first limiting groove and the second limiting groove.

[0010] Furthermore, a columnar optical fiber is connected inside the central through hole.

[0011] Furthermore, the magnetic surfaces of the first and second magnetic columns are respectively connected to anti-slip components.

[0012] Furthermore, the anti-slip component is a rubber sheet or a silicone sheet.

[0013] Furthermore, the yarn clamping device is connected to a counter for recording the number of rotations of the rotating end.

[0014] Furthermore, the rotating end has an arc-shaped protrusion on its side, and the receiving cavity is connected to a counter receiving component for accommodating the counter. The size of the cavity inside the counter receiving component is adapted to the volume of the counter, which can both accommodate the counter and provide a good limiting function. A through hole is provided between the counter receiving component and the receiving cavity, so that the counting operation button of the counter passes through the through hole and contacts and squeezes the protrusion when the rotating end rotates to this position to perform counting. A display window for displaying the counter display screen is provided on the front side of the counter receiving component.

[0015] Compared with the prior art, the beneficial effects of the present invention are reflected in: 1. This invention provides a yarn clamping device that clamps yarn using magnetic suction columns and magnetic suction surfaces. It is simple to operate, and the central through hole allows light to pass through during yarn measurement, facilitating more accurate measurement of the yarn diameter. 2. The present invention sets up symmetrical alignment grooves and a superior arc-shaped limiting groove with a central angle greater than 180°, which can realize yarn centering and posture constraint, correct the irregular shape of yarn that is fluffy, curly, or fuzzy, and eliminate detection errors caused by yarn shape distortion.

[0016] Meanwhile, the central through-hole can integrate a columnar optical fiber structure, which facilitates alignment detection and overcomes the technical defects of traditional optical detection methods, such as uncontrollable yarn posture and large alignment deviation leading to distorted detection results.

[0017] 3. When the yarn needs to be twisted, rotate the rotating wheel in the receiving cavity. The magnetic column in the second limiting groove rotates synchronously, which makes the yarn it holds rotate around the axis, thereby twisting the yarn. One rotation adds one twist to the yarn. This not only facilitates yarn twisting but also makes it easy to count the number of yarn twists. At the same time, the magnetic attraction between the two sets of magnetic columns allows the rotating wheel to remain stationary when no external force is applied. When an external force is applied, the rotating wheel rotates a certain angle, and the magnetic attraction makes the rotating wheel rotate one full turn quickly. The operation is convenient.

[0018] By using a rotating structure to actively shape and shape untwisted chemical filaments, the traditional manual quantitative twisting operation is replaced, reducing manual operation errors and operational difficulty. This effectively solves the industry pain points of poor adaptability of existing technologies to short yarns and untwisted filaments, as well as the high operational difficulty.

[0019] 4. The curved cavity prevents the rotating wheel from coming off from above, reducing positional misalignment and loosening issues; the limiting boss and limiting slot facilitate the positioning of the rotating wheel, improving operational stability.

[0020] 5. The yarn clamping device is equipped with a counting device to facilitate the counting of the number of yarn twists by the counting personnel. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the yarn clamping device according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the overall side structure of the yarn clamping device according to Embodiment 1 of the present invention; Figure 3 This is a front view of the yarn clamping device in use according to Embodiment 1 of the present invention. Figure 4 This is a schematic diagram of the yarn clamping device according to Embodiment 1 of the present invention when an optical fiber is installed; Figure 5 This is a schematic diagram of the overall structure of the base according to Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the overall structure of the rotating wheel according to Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the overall side structure of the rotating wheel according to Embodiment 2 of the present invention; Figure 8 This is a schematic diagram of the yarn clamping device according to Embodiment 2 of the present invention. Figure 9 This is a schematic diagram of the rotating wheel at different angles according to Embodiment 3 of the present invention; Figure 10 This is a schematic diagram of the overall structure of the base according to Embodiment 3 of the present invention; Figure 11 This is a schematic diagram of the counter structure according to Embodiment 3 of the present invention.

[0022] Base 1, central through hole 2, first platform 3, first limiting groove 4, second limiting groove 5, second platform 6, first magnetic suction post 7, second magnetic suction post 8, groove 9, yarn 10, receiving cavity 11, rotating end 12, connecting end 13, third platform 14, fourth platform 15, support platform 16, limiting boss 17, limiting slot 18, protrusion 19, counter receiving component 20, display window 21, counting operation button 22, counter display screen 23, optical fiber 24. Detailed Implementation

[0023] The technical solution of the present invention will be further described in detail below with reference to the embodiments and accompanying drawings.

[0024] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of the invention.

[0025] Example 1 This embodiment provides a yarn 10 clamping device, such as Figure 1-3As shown, the yarn 10 clamping device includes a base 1, with a central through hole 2 extending along the thickness direction in the middle of the base 1. A first platform 3 is connected to the upper end face of the base 1 around the central through hole 2. A first limiting groove 4 and a second limiting groove 5 are parallel to each other on the upper end face of the first platform 3. The first limiting groove 4 and the second limiting groove 5 are located on both sides of the central through hole 2. A second platform 6 is also connected to the upper end face of the base 1. The second platform 6 is connected to the front side of the first platform 3, and the height of the second platform 6 is equal to that of the first limiting groove 4 and the second limiting groove 5. The lower end faces of the two limiting grooves 5 are flat and connected. The first magnetic column 7 is connected in the first limiting groove 4 and the second limiting groove 5. The first magnetic column 7 is magnetically attracted to the second magnetic column 8. The second magnetic column 8 is located on the second platform 6, and the length of the second magnetic column 8 is greater than that of the second platform 6. Two grooves 9 are symmetrically arranged on both sides of the through hole of the first platform 3. The magnetic surfaces of the first magnetic column 7 and the second magnetic column 8 on both sides of the central through hole 2 are on the same straight line as the two grooves 9, ensuring that the yarn 10 threading path is straight and the centering accuracy is high.

[0026] In one or more embodiments described in this specification, the first limiting groove 4 and the second limiting groove 5 are arc-shaped limiting grooves, and their cross-sections are arc-shaped with a central angle greater than 180°. A cylindrical magnetic column with a size that matches the arc-shaped limiting groove is selected to form an encasing limiting structure, which can prevent the magnetic column from shifting or coming out during use, and the structure is more stable.

[0027] In use, one end of the yarn 10 is clamped between the first magnetic post 7 and the second magnetic post 8 on the right side, and the magnetic attraction between the first magnetic post 7 and the second magnetic post 8 fixes the yarn 10. The yarn 10 passes through the groove 9 and the central through hole 2 as a whole, and the other end of the yarn 10 is clamped between the first magnetic post 7 and the second magnetic post 8 on the left side and fixed. When the yarn 10 does not need to be twisted, the yarn 10 clamping device of this embodiment can be used to fix the yarn 10.

[0028] For ease of operation, the length of the first magnetic column 7 is preferably the same as the length of the first limiting groove 4 and the second limiting groove 5. The front end of the second magnetic column 8 is located on the second platform 6, forming a lever-type opening and closing structure. When the end of the second magnetic column 8 away from the magnetic surface is pressed down, the second platform 6 supports the front end of the second magnetic column 8. The operator only needs to press the tail end of the second magnetic column 8 to quickly open the clamping gap. After releasing, it automatically resets and clamps due to magnetic attraction. The clamping operation is simple and efficient.

[0029] This embodiment can achieve regular clamping of conventional twisted short yarn 10, effectively restraining irregular states such as curling, fluffing, and open hairs of the yarn 10, keeping the detection section of the yarn 10 straight and regular, and greatly reducing image detection errors.

[0030] like Figure 4As shown, if the yarn 10 needs to be illuminated during measurement, a columnar optical fiber 24 or a light guide column can be configured in the central through hole 2. The light source enters from one end of the light guide column, so that the detection light source concentrates and penetrates the detection area of ​​the yarn 10, improving the image clarity of the yarn 10 and effectively improving the detection accuracy of the diameter and fineness of the yarn 10. The yarn 10 image acquisition device can be set at the corresponding position above the central through hole 2 to acquire the image of the yarn 10 for the measurement and calculation of the fineness of the yarn 10.

[0031] Example 2 Compared to Example 1, this embodiment adds a rotatable twisting adjustment structure, which is suitable for testing scenarios involving untwisted chemical filaments and yarns 10 that require quantitative twisting pretreatment.

[0032] This invention provides a yarn 10 clamping device, which includes a base 1, such as... Figure 5 and Figure 8 As shown, the base 1 has a central through hole 2 extending along the thickness direction in the middle. The upper end face of the base 1 is connected to a first platform 3 around the central through hole 2. The upper end face of the first platform 3 is provided with a first limiting groove 4 parallel to it. The upper end face of the base 1 is also connected to a second platform 6. The second platform 6 is connected to the front side of the first platform 3, and the height of the second platform 6 is level with and connected to the lower end face of the first limiting groove 4. The first limiting groove 4 can be connected to a first magnetic column 7. The first magnetic column 7 is magnetically attracted to a second magnetic column 8. The second magnetic column 8 is located on the second platform 6, and the length of the second magnetic column 8 is greater than that of the second platform 6.

[0033] A receiving cavity 11 is provided at one end away from the first limiting groove 4. The receiving cavity 11 is an arc-shaped receiving cavity 11. A rotating wheel adapted to the receiving cavity 11 is movably connected inside the receiving cavity 11, such as... Figure 6-7 As shown, the rotating wheel includes a rotating end 12 away from the central through hole 2 and a connecting end 13 close to the central through hole 2. The rotating end 12 is cylindrical and adapted to the size of the receiving cavity 11.

[0034] The connecting end 13 includes a stepped third platform 14 and a fourth platform 15. The third platform 14 has a second limiting groove 5 on its side near the central through hole 2. The second limiting groove 5 is parallel to the first limiting groove 4 and is located on both sides of the central through hole 2. The lower end face of the cross-section of the second limiting groove 5 has a support platform 16 with the same height as it. The height of the support platform 16 is higher than that of the fourth platform 15. The second limiting groove 5 is connected to a first magnetic column 7. The first magnetic column 7 is magnetically attracted to a second magnetic column 8. The second magnetic column 8 is located on the support platform 16, and the length of the second magnetic column 8 is greater than that of the second platform 6. Two grooves 9 are also symmetrically arranged on both sides of the central through hole 2 of the first platform 3. The magnetic surfaces of the first magnetic column 7 and the second magnetic column 8 on both sides of the central through hole 2 are on the same straight line as the two grooves 9. By rotating the rotating end 12, the rotating wheel can rotate around the axis within the receiving cavity 11.

[0035] The receiving cavity 11 is provided with a limiting boss 17, and the height of the cavity surface at the end of the receiving cavity 11 away from the central through hole 2 is less than the height of the cavity surface at the end closer to the central through hole 2; the rotating end 12 is provided with a limiting groove 18 that is adapted to the limiting boss 17.

[0036] In some embodiments, the first limiting groove 4 and the second limiting groove 5 are arc-shaped limiting grooves, and their cross-sections are arc-shaped with a central angle greater than 180°. The magnetic column is cylindrical and its size is adapted to prevent the magnetic column from dislodging during operation.

[0037] In some embodiments, the outer edge of the rotating end 12 is provided with anti-slip parts or anti-slip threads, which can increase the friction during rotation operation and facilitate precise speed and angle control.

[0038] For ease of operation, the length of the first magnetic suction post 7 on the right side is the same as the length of the first limiting groove 4, and the front end of the second magnetic suction post 8 is located on the second platform 6. Pressing down on the end of the second magnetic suction post 8 away from the magnetic suction surface allows the second platform to support the front end of the second magnetic suction post 8, facilitating the opening and closing clamping operation of the first magnetic suction post 7 and the second magnetic suction post 8. The length of the first magnetic suction post 7 on the left side is the same as the length of the second limiting groove 5, and the front end of the second magnetic suction post 8 is located on the support platform 16. Pressing down on the end of the second magnetic suction post 8 away from the magnetic suction surface allows the support platform 16 to support the front end of the second magnetic suction post 8, facilitating the opening and closing clamping operation of the first magnetic suction post 7 and the second magnetic suction post 8.

[0039] When using, such as Figure 8 As shown, press the second magnetic column 8 on the rotating wheel to clamp the yarn 10 between the first magnetic column 7 and the second magnetic column 8. Place the rotating wheel into the receiving cavity 11 from the left side. The yarn 10 passes through the groove 9 and the central through hole 2, and the other end is clamped between the two magnetic columns of the first limiting groove 4 in the same way.

[0040] When it is necessary to twist the yarn 10, rotate the rotating end 12, and the rotating wheel rotates around the axis in the receiving cavity 11, increasing the number of twists of the yarn 10. At the same time, due to the magnetic attraction between the two sets of magnetic columns, the rotating wheel can remain stationary when no external force is applied. When an external force is applied, the rotating wheel rotates at a certain angle, and the magnetic attraction causes the rotating wheel to rotate quickly for one revolution and then stop. The operation is convenient and easy to count.

[0041] In this embodiment, precise manual twisting of untwisted filaments can be achieved by rotating the rotating wheel, replacing the traditional manual twisting method. The twist is uniform and has good repeatability. Moreover, the magnetic locking structure can achieve rotational positioning and self-locking. The rotating wheel remains fixed when there is no external force, and can quickly return to its position after force is applied. This facilitates twist counting and quantitative twisting, effectively solving the problems of high difficulty and poor consistency in the pre-processing of existing untwisted filament detection.

[0042] Example 3 To facilitate counting the number of twists in the yarn, this embodiment also proposes a yarn clamping device that can count, which is a partial improvement on the basis of embodiment 2. To make the technical solution of this embodiment clearer, this embodiment mainly describes the differences from embodiment 2. The specific technical solution is: the yarn clamping device is connected to a counter for recording the number of rotations of the rotating end.

[0043] The counter structure used in this embodiment is as follows: Figure 11 As shown, this counter is a commercially available electronic counter.

[0044] like Figure 9 As shown, the rotating end has an arc-shaped protrusion 19 on its side, such as... Figure 10 As shown, the side end of the receiving cavity is connected to a counter receiving member 20 for accommodating the counter. The size of the cavity inside the counter receiving member is adapted to the volume of the counter, which can both accommodate the counter and play a good limiting role. A through hole is provided between the counter receiving member and the receiving cavity, so that the counting operation button 22 of the counter passes through the through hole and contacts and squeezes the protrusion 19 when the rotating end rotates to the position to perform counting. A display window 21 for displaying the counter display screen 23 is provided on the front side of the counter receiving member 20.

[0045] To better ensure compatibility between the receiving cavity, rotating wheel, and counter during assembly and use, the shape of their contact parts can be appropriately adjusted without affecting the functional structure.

[0046] In use, manually rotate end 12. When the protrusion 19 contacts the counting operation button, continue rotating. The protrusion will press against the counter operation button, thus triggering the counting operation. One rotation triggers one count, indicating that the yarn has been twisted one turn. The count value on the display screen can be observed at any time through the display window to know the number of yarn twists.

[0047] In some embodiments, the magnetic surfaces of the first magnetic column 7 and the second magnetic column 8 are respectively connected to anti-slip components, which can be rubber sheets or silicone sheets to increase the clamping firmness and prevent the yarn 10 from slipping or loosening.

[0048] In some embodiments, the diameter of the first magnetic post 7 and the second magnetic post 8 is 4-10 mm, the length is 8-15 mm, and the size of the limiting groove matches the size of the magnetic post.

[0049] Considering the small and precise clamping requirements of the equipment, the optimal choice is a neodymium iron boron cylindrical magnetic column with a diameter of 5mm and a length of 10-12mm. It has moderate magnetic attraction, stable clamping, and compact assembly, and is suitable for testing various short yarns 10 and chemical filaments. Those skilled in the art can reasonably adjust the size parameters according to the thickness of the yarn 10 to be tested to ensure a suitable magnetic clamping force on the yarn 10.

[0050] This invention adapts to conventional flat clamping detection and controllable twisting detection scenarios through two sets of embodiments. The structures are complementary and the working conditions are fully covered. It can effectively solve the pain points of existing short yarn and untwisted filament fineness detection, such as messy posture, inaccurate centering, unstable clamping, difficulty in twisting, and low detection accuracy. It has outstanding engineering practical value.

[0051] It should be noted that the above description is for illustrative purposes only and does not limit the scope of this specification.

[0052] Obviously, those skilled in the art can make various modifications and changes to it under the guidance of this specification.

[0053] However, these modifications and changes are still within the scope of this specification.

[0054] It should be understood that the directional terms such as front, back, left, right, top, bottom, and side used in this specification are descriptions with reference to the illustrated state in the drawings, and are only used to clearly illustrate the structural composition, and are not intended to limit the location of the scope of protection of this invention.

[0055] As long as the established assembly relationship is maintained between the components, their installation orientation can be changed arbitrarily. Such equivalent substitutions in orientation are all within the protection scope of this invention.

[0056] In addition, specific terms are used in this specification to describe the embodiments thereof.

[0057] For example, "one embodiment" or "some embodiments" means a feature, structure, or characteristic that is related to at least one embodiment of this specification.

[0058] Therefore, it should be emphasized and noted that "one embodiment" mentioned twice or more in different places in this specification does not necessarily refer to the same embodiment.

[0059] Furthermore, certain features, structures, or characteristics in one or more embodiments of this specification may be appropriately combined.

[0060] Similarly, it should be noted that, in order to simplify the description disclosed in this specification and thereby aid in the understanding of one or more embodiments of the invention, multiple features may sometimes be grouped into a single embodiment, drawing, or description thereof in the foregoing description of the embodiments of this specification.

[0061] However, this disclosure method does not mean that the features required by the subject matter of this specification are more than those mentioned in the claims.

[0062] In fact, the features of the embodiments are fewer than all the features of the single embodiments disclosed above.

[0063] Finally, it should be understood that the embodiments described in this specification are only used to illustrate the principles of the embodiments in this specification.

[0064] Other variations may also fall within the scope of this specification.

[0065] Therefore, alternative configurations of the embodiments in this specification are to be regarded as consistent with the teachings of this specification, rather than as examples or limitations.

[0066] Accordingly, the embodiments described herein are not limited to those explicitly presented and described herein.

Claims

1. A yarn clamping device, characterized in that: The system includes a base with a central through-hole extending along its thickness. A first platform is connected to the upper surface of the base around the central through-hole. A first limiting groove and a second limiting groove are parallel to each other on the upper surface of the first platform, located on opposite sides of the central through-hole. A second platform is also connected to the upper surface of the base, and the second platform is connected to the front side of the first platform. The height of the second platform is level with and connected to the lower surfaces of the first and second limiting grooves. A first magnetic column is connected within the first and second limiting grooves. The first magnetic column magnetically attracts and connects to a second magnetic column, which is located on the second platform and has a length greater than that of the second platform. Two grooves are symmetrically arranged on both sides of the through-hole of the first platform. The magnetic surfaces of the first and second magnetic columns on both sides of the central through-hole are aligned with the two grooves.

2. The yarn clamping device according to claim 1, characterized in that: The upper surface of the first platform of the base is provided with a first limiting groove, and the end away from the first limiting groove is provided with a receiving cavity. A rotating wheel adapted to the receiving cavity is movably connected in the receiving cavity. The rotating wheel includes a rotating end away from the central through hole and a connecting end near the central through hole. The connecting end includes a stepped third platform and a fourth platform. The side of the third platform near the central through hole is provided with a second limiting groove. The second limiting groove is parallel to the first limiting groove. The lower end surface of the cross-section of the second limiting groove is provided with a support platform of the same height as it. The height of the support platform is higher than that of the fourth platform. A first magnetic column is connected in the second limiting groove. The first magnetic column is magnetically attracted to a second magnetic column. The second magnetic column is located on the support platform, and the length of the second magnetic column is greater than that of the second platform. The magnetic surfaces of the first and second magnetic columns on both sides of the central through hole are collinear with the two grooves. By rotating the rotating end, the rotating wheel can rotate axially in the receiving cavity.

3. The yarn clamping device according to claim 2, characterized in that: The receiving cavity is an arc-shaped receiving cavity, and the rotating end is a cylindrical shape adapted to its size.

4. A yarn clamping device according to claim 2, characterized in that: The cavity is provided with a limiting boss, and the height of the cavity surface at the end away from the central through hole is less than the height of the cavity surface at the end closer to the central through hole; the rotating end is provided with a limiting groove that matches the limiting boss.

5. A yarn clamping device according to claim 2, characterized in that: The outer edge of the rotating end is provided with anti-slip parts or anti-slip threads.

6. A yarn clamping device according to claim 1 or 2, characterized in that: The first limiting groove and the second limiting groove are arc-shaped limiting grooves, and their cross-sections are superior arc shapes with a central angle greater than 180°.

7. A yarn clamping device according to claim 1 or 2, characterized in that: The length of the first magnetic column is the same as the length of the first limiting groove and the second limiting groove.

8. A yarn clamping device according to claim 1 or 2, characterized in that: A columnar optical fiber is connected inside the central through hole.

9. A yarn clamping device according to claim 2, characterized in that: The yarn clamping device is connected to a counter for recording the number of rotations of the rotating end.

10. A yarn clamping device according to claim 9, characterized in that: The rotating end has an arc-shaped protrusion on its side, and the receiving cavity is connected to a counter receiving component for accommodating the counter. A through hole is provided between the counter receiving component and the receiving cavity, so that the counting operation button for the counter passes through the through hole and contacts and squeezes the protrusion when the rotating end rotates to the position to perform counting. A display window for displaying the counter display screen is provided on the front side of the counter receiving component.

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