Online measurement device and online measurement method for single-wire diameter

The online detection device enables real-time detection of single filament diameter, solving the problem of low production efficiency in the single filament diameter detection process and ensuring the continuity and efficiency of the stranding process.

WO2026148871A1PCT designated stage Publication Date: 2026-07-16JIANGSU ZHONGTIAN TECH CO LTD +1

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
JIANGSU ZHONGTIAN TECH CO LTD
Filing Date
2025-08-21
Publication Date
2026-07-16

AI Technical Summary

Technical Problem

In existing technologies, the process of detecting the diameter of a single filament is prone to low production efficiency and requires intermittent shutdowns for testing.

Method used

An online detection device is used, which combines a stranding wheel, a diameter detection component, and a positioning sensor to achieve real-time detection of the diameter of a single filament without stopping the machine during the stranding process.

Benefits of technology

This ensures the continuous operation of the monofilament stranding process, improves production efficiency, and avoids increased time due to downtime for inspection.

✦ Generated by Eureka AI based on patent content.

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Abstract

An online measurement device for single-wire diameter, comprising: a twisting wheel disk (100), the twisting wheel disk (100) being provided with a plurality of mounting holes (110) distributed in the circumferential direction of the twisting wheel disk (100), and each mounting hole (110) being used for allowing a single wire (10) to pass through; a diameter measurement member (200), the diameter measurement member (200) being arranged on one side of the twisting wheel disk (100) and being used for measuring the diameter of the single wire (10) corresponding to the diameter measurement member (200); and an alignment sensor (300), the alignment sensor (300) being electrically connected to the diameter measurement member (200), and the alignment sensor (300) being configured to: as the twisting wheel disk (100) rotates, when the single wire (10) enters the measurement position of the diameter measurement member (200), trigger the diameter measurement member (200) to measure the diameter of the single wire (10) at the current corresponding position. The described solution solves the problem of low production efficiency easily caused by the single-wire diameter measurement process in the prior art. In addition, further provided is an online measurement method for single-wire diameter.
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Description

An online detection device and method for monofilament diameter Technical Field

[0001] This application relates to the technical field of monofilament diameter detection, and more particularly to an online detection device and method for monofilament diameter. Background Technology

[0002] Currently, during the production process of some products, it is often necessary to inspect the diameter of some parts.

[0003] In related technologies, taking steel-cored aluminum stranded wire as an example, steel-cored aluminum stranded wire consists of multiple monofilaments, which are twisted together by a frame stranding machine to form a stranded wire. In order to check whether the diameter of the monofilaments is qualified during production, the machine needs to be stopped intermittently and the diameter of the monofilaments needs to be tested.

[0004] However, the aforementioned method of detecting the diameter of monofilaments can easily lead to low production efficiency. Summary of the Invention

[0005] This application provides an online detection device and method for monofilament diameter to solve the problem that the existing monofilament diameter detection process easily leads to low production efficiency.

[0006] In a first aspect, embodiments of this application provide an online detection device for monofilament diameter, comprising:

[0007] A stranding wheel has a plurality of mounting holes distributed along the circumference of the stranding wheel, each mounting hole being used to thread a single filament.

[0008] A diameter detection element is disposed on one side of the stranding wheel and is used to detect the diameter of the monofilament corresponding to the diameter detection element;

[0009] A positioning sensor is electrically connected to the diameter detection element. The positioning sensor is configured such that, as the stranding wheel rotates, when the monofilament enters the detection position of the diameter detection element, it triggers the diameter detection element to detect the diameter of the monofilament at the corresponding current position.

[0010] In one possible implementation, the stranding wheel is rotatably provided with a plurality of guide wheels, each of which is respectively disposed in the mounting hole, and the periphery of the guide wheel is used to support the monofilament.

[0011] In one possible implementation, the guide wheel has a snap-fit ​​groove on its circumference for accommodating the monofilament, and the snap-fit ​​groove is coaxially arranged with the guide wheel.

[0012] In one possible implementation, the diameter detection device includes a profilometer and a protective cover, the profilometer being disposed inside the protective cover and used to detect the diameter of the monofilament.

[0013] In one possible implementation, the diameter detection element is detachably provided with a connecting bracket, and the alignment sensor is detachably mounted on the connecting bracket.

[0014] In one possible implementation, a reference component is also included, which is used to determine the location of the first diameter-detected monofilament.

[0015] In one possible implementation, the reference assembly includes a magnetic element and a magnetic sensor, the magnetic element being disposed on the winch and corresponding to any one of the mounting holes;

[0016] The magnetic sensor is disposed on the diameter detection component. The magnetic sensor is used to identify the monofilament at the corresponding position as the first monofilament to be detected in diameter when the magnetic component enters the detection range of the magnetic sensor.

[0017] In one possible implementation, the magnetic sensor includes two spaced-apart sensing units, with the area between the two sensing units forming the detection range of the magnetic sensor.

[0018] In one possible implementation, the magnetic element includes a magnetic screw threaded onto the periphery of the winch disc, the magnetic screw corresponding to any one of the mounting holes.

[0019] Secondly, embodiments of this application also provide an online method for detecting the diameter of a single filament, employing the online detection device for the diameter of a single filament as described in any of the above embodiments, comprising the following steps:

[0020] Each monofilament is threaded into the mounting holes on the twisting wheel in the online detection device for the diameter of the monofilament, so that the monofilaments are twisted together by the twisting wheel.

[0021] When the alignment sensor in the online detection device for the diameter of the monofilament detects that the monofilament has entered the detection range of the diameter detection element in the online detection device for the diameter of the monofilament, it triggers the diameter detection element to detect the diameter of the monofilament at the current corresponding position.

[0022] As the stranding wheel rotates, the diameter of each of the single filaments in each of the mounting holes is detected sequentially.

[0023] This application provides an online detection device and method for monofilament diameter. The online detection device comprises: a stranding wheel with multiple mounting holes distributed circumferentially on it, each hole corresponding to a monofilament; a diameter detection element disposed on one side of the stranding wheel and used to detect the diameter of the monofilament corresponding to it; and a positioning sensor electrically connected to the diameter detection element. During operation, the stranding wheel continuously strands the monofilaments. When the positioning sensor detects any monofilament entering the detection position of the diameter detection element, it triggers the element to detect the diameter of the corresponding monofilament. Similarly, the diameter of each monofilament is detected online sequentially. This monofilament diameter detection process does not require machine downtime, ensuring continuous stranding and minimizing the time required for stranding, thus improving production efficiency and solving the problem of low production efficiency in existing monofilament diameter detection processes. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] Figure 1 is a schematic diagram of the structure of a single filament diameter detection device provided in this application;

[0026] Figure 2 is a schematic diagram of the line laser ranging operation of the profilometer in Figure 1;

[0027] Figure 3 is an enlarged structural diagram of part A in Figure 1.

[0028] Explanation of reference numerals in the attached drawings: 10-monofilament; 100-stranding wheel; 110-mounting hole; 120-guide wheel; 121-locking ring groove; 200-diameter measuring element; 210-profilometer; 220-protective cover; 300-alignment sensor; 310-connecting bracket; 400-reference assembly; 410-magnetic component; 420-magnetic sensor; 421-sensing unit.

[0029] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0030] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0031] In related technologies, the diameter of certain components in some products often needs to be inspected during the production process. Taking aluminum-coated steel wire as an example, aluminum-coated steel wire consists of multiple individual wires, which are twisted together to form a stranded wire during production. To verify whether the diameter of the individual wires is within acceptable limits during production, the diameter of each individual wire needs to be inspected.

[0032] When inspecting the diameter of a single filament, it is usually necessary to pause the frame stranding machine, inspect the diameter of each single filament in turn, and then restart the frame stranding machine to continue the single filament stranding process. However, this single filament diameter inspection process tends to increase the time taken for the single filament stranding process, resulting in lower production efficiency.

[0033] Therefore, this application provides an online detection device and method for monofilament diameter. The online detection device for monofilament diameter includes: a stranding wheel with multiple mounting holes distributed circumferentially on the wheel, each hole corresponding to a monofilament; a diameter detection element disposed on one side of the stranding wheel and used to detect the diameter of the monofilament corresponding to it; and a positioning sensor electrically connected to the diameter detection element. During operation, the stranding wheel continuously strands the monofilaments. During stranding, when the positioning sensor detects any monofilament entering the detection position of the diameter detection element, it triggers the element to detect the diameter of the corresponding monofilament. Similarly, the diameter of each monofilament is detected online sequentially. This monofilament diameter detection process does not require machine downtime, ensuring continuous stranding and minimizing the time required for stranding, thus improving production efficiency and solving the problem of low production efficiency in existing monofilament diameter detection processes.

[0034] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0035] As shown in Figure 1, this embodiment of the application provides an online detection device for monofilament diameter, comprising:

[0036] The twisting wheel 100 has a plurality of mounting holes 110 distributed along the circumference of the twisting wheel 100, and each mounting hole 110 is used to pass through each monofilament 10 respectively.

[0037] A diameter detection element 200 is disposed on one side of the stranding wheel 100 and is used to detect the diameter of the monofilament 10 corresponding to the diameter detection element 200.

[0038] The alignment sensor 300 is electrically connected to the diameter detection element 200. The alignment sensor 300 is configured to trigger the diameter detection element 200 to detect the diameter of the monofilament 10 at the current corresponding position when the stranding wheel 100 rotates and the monofilament 10 enters the detection position of the diameter detection element 200.

[0039] It should be noted that the winch 100 is rotatably mounted. In practice, the winch 100 can be rotatably mounted on a frame, base or other component, and the rotation of the winch 100 can be controlled by a motor or other power component. This part is not shown in the attached drawings. It is only necessary to make the winch 100 rotate, and no other restrictions are imposed on it.

[0040] The twisting wheel 100 has multiple mounting holes 110, which are evenly distributed around the axis of the twisting wheel 100, so that each monofilament 10 can be correspondingly threaded through each mounting hole 110, thereby controlling the twisting of each monofilament 10 with each other when the twisting wheel 100 rotates. In the attached figure, only a portion of the monofilaments 10 on the twisting wheel 100 are shown for illustration.

[0041] The diameter detection element 200 and the alignment sensor 300 are both located on the periphery of the winch 100. The diameter detection element 200 and the alignment sensor 300 can be located on the same side of the winch 100, and the diameter detection element 200 and the alignment sensor 300 are on the same horizontal plane.

[0042] The alignment sensor 300 is electrically connected to the diameter detection element 200. When the alignment sensor 300 detects any single filament 10, it means that the single filament 10 is located at the detection position of the diameter detection element 200. Then, the diameter detection element 200 is triggered to detect the diameter of the single filament 10 at the current position.

[0043] During operation, the twisting wheel 100 continuously twists the individual filaments 10. During this twisting process, when the alignment sensor 300 detects any single filament 10 entering the detection position of the diameter detection element 200, it triggers the diameter detection element 200 to detect the diameter of the corresponding filament 10. Similarly, the diameter of each filament 10 is detected sequentially. This single filament diameter detection process does not require machine downtime, thus ensuring the continuous twisting process and minimizing the time required for twisting, thereby improving production efficiency. This solves the problem of low production efficiency in existing single filament diameter detection processes.

[0044] It should be noted that this online detection device for the diameter of a single filament can also be used to detect the diameter of other parts, such as rods, pipes, and cables, without limitation. In this embodiment, the diameter detection of the single filament 10 is taken as an example only.

[0045] As shown in Figure 1, specifically, the diameter detection component 200 includes a profilometer 210 and a protective cover 220. The profilometer 210 is disposed inside the protective cover 220 and is used to detect the diameter of the monofilament 10.

[0046] The model of the profilometer 210 is not limited. The alignment sensor 300 is electrically connected to the profilometer 210. The alignment sensor 300 can be a laser photoelectric sensor or other types, and there are no restrictions on this. Thus, the alignment sensor 300 triggers the profilometer 210 to work in order to detect the diameter of the monofilament 10.

[0047] It should be noted that, as shown in Figure 2, the profilometer 210 obtains the distance between each point on the semicircular surface of the monofilament 10 by means of line laser ranging, and then calculates the diameter of the monofilament 10 by means of image processing.

[0048] In addition, the protective cover 220 provides better protection for the profilometer 210, thereby reducing the possibility of damage to the profilometer 210 and extending its service life.

[0049] In practice, for example, a frame or other components can be set up on site and the protective cover 220 can be fixed on the bracket or other components to complete the installation of the protective cover 220. Of course, the installation method of the protective cover 220 is not limited, as long as the protective cover 220 and the profilometer 210 are located around the circumference of the winch 100. This is not shown in the attached drawings.

[0050] It should be noted that the diameter detection component 200 is detachably equipped with a connecting bracket 310, and the alignment sensor 300 is detachably mounted on the connecting bracket 310.

[0051] Specifically, the connecting bracket 310 is fixed to the outer wall of the protective cover 220 by screwing, and the alignment sensor 300 is connected to the connecting bracket 310 by screwing, thereby fixing the alignment sensor 300 to the diameter detection piece 200, so that the two form a whole, which facilitates subsequent modular installation or use, and at the same time ensures that the two are on the same horizontal line.

[0052] In other embodiments, the connecting bracket 310 may also be connected to the protective cover 220 and the alignment sensor 300 by snap-fit, pin-fit or other means.

[0053] As shown in Figure 1, in some embodiments, the twisting wheel 100 is rotatably provided with a plurality of guide wheels 120, each guide wheel 120 being respectively disposed in each mounting hole 110, and the periphery of the guide wheel 120 being used to support the monofilament 10.

[0054] Specifically, the monofilament 10, threaded through the mounting hole 110, is clamped between the periphery of the guide wheel 120 and the inner wall of the mounting hole 110. Thus, during the conveying of the monofilament 10 within the mounting hole 110, while ensuring optimal stability, the guide wheel 120 reduces the frictional resistance experienced by the monofilament 10, improving the ease of twisting the monofilaments 10 together. The attached diagram only illustrates a portion of the guide wheels 120 within the mounting holes 110; the remaining guide wheels 120 can be similarly configured during implementation.

[0055] As shown in Figure 1, the guide wheel 120 is further provided with a snap-fit ​​groove 121 on its circumference for accommodating the monofilament 10. The snap-fit ​​groove 121 is coaxially arranged with the guide wheel 120. The monofilament 10 is located in the snap-fit ​​groove 121, which makes the guide wheel 120 provide better support for the monofilament 10 and further improves the stability of the monofilament 10 conveying process.

[0056] During the diameter detection process of the monofilament 10, the diameter of each monofilament 10 is detected sequentially, resulting in multiple sets of diameter data on the diameter detection device 200. These data are then matched one-to-one with each monofilament 10 on the stranding wheel 100 to refine the diameter down to the individual monofilament 10. To facilitate this one-to-one correspondence between the diameter data and each monofilament 10, in some embodiments, the monofilament diameter detection device further includes a reference component 400, which is used to determine the location of the first monofilament 10 whose diameter is being detected.

[0057] It should be noted that the first monofilament 10 to be measured at the beginning of diameter detection is marked by the reference component 400. After the twisting wheel 100 rotates, the diameter of each monofilament 10 has been measured sequentially. A coordinate system or table is established with the monofilament 10 marked by the reference component 400 as the origin. Each monofilament 10 passing through the diameter detection component 200 is arranged sequentially. Then, multiple sets of data on the diameter detection component 200 can be matched one-to-one with each monofilament 10 in the coordinate system or table, thereby accurately obtaining the diameter of each monofilament 10. The process of matching this data is relatively convenient.

[0058] As shown in Figures 1 and 3, in some embodiments, the reference assembly 400 includes a magnetic element 410 and a magnetic sensor 420. The magnetic element 410 is disposed on the winch 100 and corresponds to any one of the mounting holes 110.

[0059] A magnetic sensor 420 is disposed on the diameter detection component 200. The magnetic sensor 420 is used to identify the monofilament 10 at the corresponding position as the first monofilament 10 to be detected when the magnetic component 410 enters the detection range of the magnetic sensor 420.

[0060] In this embodiment, the magnetic component 410 corresponds to any one of the mounting holes 110, thereby marking the monofilament 10 in the mounting hole 110, so that the monofilament 10 is marked as the first monofilament 10 to be used for diameter detection.

[0061] The model of the magnetic sensor 420 is not limited. The magnetic sensor 420 is set on the diameter detection component 200. The magnetic sensor 420 can be fixed on the protective cover 220, so that the magnetic sensor 420, the alignment sensor 300 and the diameter detection component 200 are all located on the same side of the winch 100. The magnetic sensor 420 is electrically connected to the alignment sensor 300 and the diameter detection component 200.

[0062] During the detection process, when the magnetic sensor 420 detects the magnetic component 410, it marks the corresponding single filament 10 as the first single filament 10 to be detected in diameter, and at the same time triggers the alignment sensor 300 and the diameter detection component 200 to start the diameter detection of each single filament 10.

[0063] In practice, for example, a PLC controller (not shown in the figure) can be added to control the signals or data. The magnetic sensor 420 transmits the signal to the PLC controller (not shown in the figure) to obtain the serial number reference of the single filament 10 so that each single filament 10 can be matched one-to-one with the diameter of the single filament 10 obtained by the profilometer 210.

[0064] In addition, during implementation, the magnetic sensor 420 can be set such that when the magnetic sensor 420 detects the magnetic element 410 again, it indicates that the twisting wheel 100 has rotated one revolution and the diameter of each single wire 10 has been detected. At this time, the alignment sensor 300 and the diameter detection element 200 are controlled to stop detection.

[0065] Of course, after the twisting wheel 100 rotates once, the alignment sensor 300 and the diameter detection component 200 can be continuously and repeatedly detected to measure the diameter of each filament 10. Finally, the data from each group can be integrated or averaged to obtain a more accurate value for the diameter of the filament 10.

[0066] As shown in Figures 1 and 3, specifically, the magnetic sensor 420 includes two spaced sensing units 421, and the area between the two sensing units 421 forms the detection range of the magnetic sensor 420.

[0067] The magnetic component 410 includes a magnetic screw, which is threaded onto the periphery of the hinged wheel 100 and corresponds to any one of the mounting holes 110.

[0068] Each sensing unit 421 can be fixed to the outer wall of the protective cover 220 by screwing or other means, and is located on the side of the protective cover 220 facing the winch 100. Two sensing units 421 can be distributed vertically at intervals, such that the area between the two sensing units 421 is the detection range of the magnetic sensor 420. Of course, they can also be distributed horizontally at intervals, and there is no limitation on this.

[0069] When the magnetic screw enters the detection range of the magnetic sensor 420, the magnetic sensor 420 is triggered. Furthermore, the magnetic screw can be easily installed or removed from the winch 100, improving its usability.

[0070] In other embodiments, the magnetic component 410 may also be configured as other components, such as a magnetic block, a magnetic pin, a magnetic nut, etc.

[0071] In summary, the online detection device for monofilament diameter provided in this application continuously winds each monofilament 10 by rotating the winding wheel 100 during operation. During the winding process, when the alignment sensor 300 detects any monofilament 10 entering the detection position of the diameter detection element 200, it triggers the diameter detection element 200 to detect the diameter of the monofilament 10 at the corresponding position. Similarly, the diameter of each monofilament 10 is detected online sequentially. This monofilament diameter detection process does not require machine downtime, thus ensuring the continuous winding process of the monofilament 10, minimizing the increase in winding time, improving production efficiency, and solving the problem of low production efficiency in the existing monofilament diameter detection process.

[0072] This application also provides an online method for detecting the diameter of a single filament, using the online detection device for the diameter of a single filament in any of the above embodiments, including the following steps:

[0073] Each monofilament 10 is threaded into the mounting holes 110 on the twisting wheel 100 in the online detection device for monofilament diameter, so that each monofilament 10 is twisted together by the twisting wheel 100.

[0074] When the alignment sensor 300 in the online detection device for monofilament diameter detects that monofilament 10 has entered the detection range of diameter detection element 200 in the online detection device for monofilament diameter, it triggers diameter detection element 200 to detect the diameter of monofilament 10 at the current corresponding position.

[0075] As the twisting wheel 100 rotates, the diameter of the monofilament 10 in each mounting hole 110 is checked in sequence.

[0076] In summary, the online detection method for the diameter of monofilament 10 provided in this application embodiment does not require machine downtime during the detection process, thereby ensuring the continuous operation of the monofilament 10 twisting process, reducing the time required for the monofilament 10 twisting process, improving production efficiency, and solving the problem that the diameter detection process of monofilament 10 in the prior art is prone to low production efficiency.

[0077] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. An online detection device for monofilament diameter, characterized in that, include: A twisting wheel (100) has a plurality of mounting holes (110) distributed circumferentially along the twisting wheel (100), and each mounting hole (110) is used to thread each monofilament (10) through it respectively. A diameter detection element (200) is disposed on one side of the stranding wheel (100) and is used to detect the diameter of the monofilament (10) corresponding to the diameter detection element (200); A positioning sensor (300) is electrically connected to the diameter detection element (200). The positioning sensor (300) is configured to trigger the diameter detection element (200) to detect the diameter of the monofilament (10) at the current corresponding position when the monofilament (10) enters the detection position of the diameter detection element (200) as the stranding wheel (100) rotates.

2. The online detection device for monofilament diameter according to claim 1, characterized in that, The twisting wheel (100) is rotatably provided with a plurality of guide wheels (120), each of the guide wheels (120) being respectively disposed in each of the mounting holes (110), and the periphery of the guide wheel (120) being used to support the monofilament (10).

3. The online detection device for monofilament diameter according to claim 2, characterized in that, The guide wheel (120) has a snap-fit ​​groove (121) on its periphery for accommodating the monofilament (10), and the snap-fit ​​groove (121) is coaxially arranged with the guide wheel (120).

4. The online detection device for monofilament diameter according to claim 1, characterized in that, The diameter detection component (200) includes a profilometer (210) and a protective cover (220). The profilometer (210) is disposed inside the protective cover (220) and is used to detect the diameter of the monofilament (10).

5. The online detection device for monofilament diameter according to claim 1, characterized in that, The diameter detection component (200) is detachably provided with a connecting bracket (310), and the alignment sensor (300) is detachably provided on the connecting bracket (310).

6. The online detection device for monofilament diameter according to any one of claims 1-5, characterized in that, It also includes a reference component (400) for determining the location of the first diameter-detected monofilament (10).

7. The online detection device for monofilament diameter according to claim 6, characterized in that, The reference assembly (400) includes a magnetic element (410) and a magnetic sensor (420). The magnetic element (410) is disposed on the winch disc (100) and corresponds to any one of the mounting holes (110). The magnetic sensor (420) is disposed on the diameter detection element (200). The magnetic sensor (420) is used to identify the monofilament (10) at the corresponding position as the first monofilament (10) to be detected when the magnetic element (410) enters the detection range of the magnetic sensor (420).

8. The online detection device for monofilament diameter according to claim 7, characterized in that, The magnetic sensor (420) includes two spaced sensing units (421), and the area between the two sensing units (421) forms the detection range of the magnetic sensor (420).

9. The online detection device for monofilament diameter according to claim 7, characterized in that, The magnetic component (410) includes a magnetic screw threaded onto the periphery of the hinged wheel (100), and the magnetic screw corresponds to any one of the mounting holes (110).

10. An online method for detecting the diameter of a single filament, using the online detection device for the diameter of a single filament as described in any one of claims 1-9, characterized in that, Includes the following steps: Each monofilament (10) is threaded through the mounting holes (110) on the twisting wheel (100) in the online detection device for the diameter of the monofilament, so that each monofilament (10) is twisted together by the twisting wheel (100); When the alignment sensor (300) in the online detection device for the diameter of the monofilament detects that the monofilament (10) has entered the detection range of the diameter detection element (200) in the online detection device for the diameter of the monofilament, the diameter detection element (200) is triggered to detect the diameter of the monofilament (10) at the current corresponding position. As the twisting wheel (100) rotates, the diameter of the monofilament (10) in each of the mounting holes (110) is detected in sequence.