A Machine Vision-Based Experimental Platform for Yarn Twisting Motion Analysis

Abstract

This invention provides a machine vision-based experimental platform for analyzing yarn twisting motion. The platform includes a support frame, an LED light, twisting devices, a support platform, and at least two cameras. The two twisting devices are fixed to the support frame and arranged opposite each other, with a yarn connected between them. The support platform is connected to the support frame and supports the cameras. The cameras are used to capture the yarn twisting motion process. The LED light is connected to the support frame and provides illumination for the yarn twisting process. This provides an experimental platform capable of acquiring three-dimensional dynamic motion data of the yarn twisting process with high precision and non-contact, thus breaking through existing research bottlenecks and laying the foundation for a deeper understanding and optimization of the twisting process.

Description

Technical Field

[0001] This utility model relates to the field of machine vision yarn motion analysis technology, and in particular, to a machine vision-based experimental platform for yarn twisting motion analysis. Background Technology

[0002] The continuous development of the textile industry has placed higher demands on yarn structure and performance. As a key step in the yarn formation process, twisting directly determines important physical properties of the yarn, such as strength, hand feel, and luster. Therefore, a deep understanding of the dynamic behavior of fiber / yarn movement, trajectory, and interaction during twisting is crucial for optimizing twisting processes, improving yarn quality, and achieving precise production control.

[0003] However, current theoretical research on the complex dynamic behavior of fibers / yarns during yarn twisting is still incomplete. This lack of understanding directly leads to challenges in accurately controlling the twisting process in actual production, thus affecting the performance of the final yarn and production efficiency.

[0004] The core reason for the aforementioned research bottleneck lies in the three-dimensional, rapid, and drastically changing motion environment during yarn twisting. During this process, key parameters such as yarn speed and attitude undergo dramatic changes on minute spatial and temporal scales. Current technologies have significant limitations in measuring such complex motions.

[0005] 1. Traditional contact measurement methods intrude into the yarn movement area, inevitably interfering with the actual movement of the yarn, resulting in distorted measurement data that cannot reflect objective laws.

[0006] 2. Non-contact measurement techniques, especially traditional two-dimensional vision inspection methods, although avoiding physical interference, are difficult to accurately and completely capture the instantaneous three-dimensional motion trajectory of high-speed moving microfibers or yarns, and therefore cannot provide the accurate and reliable measured data required for research.

[0007] In recent years, machine vision technology, with high-speed cameras at its core, has shown great potential in the capture and dynamic tracking of high-speed moving targets due to its high temporal resolution. Applying this technology to the analysis of yarn twisting motion is considered an effective way to break through the bottlenecks of traditional measurement techniques and deeply reveal the twisting mechanism.

[0008] However, directly applying existing machine vision technology to the specialized field of yarn twisting motion still faces a series of severe challenges, especially in acquiring complete, instantaneous three-dimensional motion trajectory data of the yarn. Because fibers and yarns undergo rapid translation and rotation in three-dimensional space, traditional two-dimensional vision inspection methods can only acquire their projection information on the imaging plane, failing to reconstruct their complete spatial motion trajectory. This severely restricts in-depth exploration of the yarn twisting mechanism. Utility Model Content

[0009] In view of this, the purpose of this utility model is to provide a machine vision-based experimental platform for yarn twisting motion analysis, which can acquire three-dimensional dynamic motion data of yarn twisting process with high precision and non-contact, thereby breaking through the existing research bottleneck and laying the foundation for a deeper understanding and optimization of the twisting process.

[0010] To solve the above-mentioned technical problems, the technical solution of this utility model is: a machine vision-based yarn twisting motion analysis experimental platform, including a support frame, and further including: an LED light, a twisting device, a support platform, and at least two cameras. The two twisting devices are fixed on the support frame and arranged opposite to each other, and a yarn is connected between the two twisting devices. The support platform is connected to the support frame and is used to support the cameras. The cameras are used to capture the yarn twisting motion process, and the LED light is connected to the support frame and is used to provide illumination for the yarn twisting process.

[0011] To achieve the above technical solution, the yarn is connected between two opposing twisting devices. Under sufficient lighting provided by LED lights, at least two cameras simultaneously capture the entire twisting process from different angles. This design enables non-contact, high-precision observation of the three-dimensional dynamic behavior of the yarn during twisting, overcoming the interference of traditional contact measurements on yarn movement and solving the problem that a single two-dimensional vision cannot capture the complete three-dimensional motion trajectory. Ultimately, this platform can provide accurate and reliable measured data for in-depth analysis of the yarn's motion posture, trajectory, and interactions, thereby optimizing the twisting process, improving yarn quality, and achieving precise production control.

[0012] As a preferred embodiment of this utility model, the twisting device includes a power motor, a support plate, and fixing rods. The power motor is connected to the support frame, and the power shaft of the power motor is connected to the support plate. A plurality of fixing rods are connected to the support plate and arranged along the axis of the support plate. The fixing rods are used to fix the yarn.

[0013] To achieve the above technical solution, a power motor drives a support plate connected to a power shaft to rotate at high speed. Multiple fixed rods arranged along the axis of the support plate are responsible for firmly clamping the yarn. Driven by the power motor, the yarn rotates at high speed around its own axis under the influence of the fixed rods, thereby achieving yarn twisting. This design makes the twisting process stable and controllable, providing standardized experimental conditions for subsequent machine vision systems to capture the yarn's motion posture and trajectory. This ensures the accuracy and repeatability of the dynamic behavior analysis of yarn twisting, ultimately helping to optimize the twisting process and improve yarn quality.

[0014] As a preferred embodiment of this utility model, the support plate is connected to a positioning protrusion, the positioning protrusion is provided with a positioning recess, the fixing rod includes a fixing part and a limiting part, the fixing part is fixedly connected to the positioning recess, and the limiting part is provided with a limiting ring groove for fixing the yarn, and a plurality of the limiting ring grooves are arranged along the length direction of the limiting part.

[0015] To achieve the above technical solution, a positioning protrusion with a positioning recess on the support plate allows the fixing part of the fixing rod to be precisely and firmly inserted, ensuring the positional stability of the fixing rod during the twisting process. Furthermore, multiple limiting annular grooves are formed along the length of the limiting part of the fixing rod. These grooves are specifically designed to stably fix the yarn, preventing slippage or displacement during high-speed twisting. This design not only ensures the accuracy and stability of twisting, avoiding problems such as yarn loosening or uneven twisting, but more importantly, it provides a reliable physical basis for the subsequent machine vision system to accurately capture the stable twisting motion of the yarn. This helps obtain high-precision motion data, enabling fine analysis and control of the yarn twisting process.

[0016] In a preferred embodiment of this utility model, the support frame has a first sliding groove along its width direction, a support plate is slidably connected to the first sliding groove, the support plate is fixed to the support frame by a first positioning bolt, and the power motor is connected to the support plate.

[0017] To achieve the above technical solution, a first groove is created on the support frame, allowing the support plate to slide along it and be fixed in the desired position by a first positioning bolt. Since the power motor is connected to the support plate, the position of the entire twisting device can be precisely adjusted and locked on the support frame. This design achieves flexible adjustability of the twisting device's position, enabling it to adapt to yarns of different lengths or adjust the shooting distance and angle. This provides a wider range of experimental parameters for the machine vision system to capture yarn movement, significantly improving the versatility and adaptability of the experimental platform.

[0018] In a preferred embodiment of this utility model, a second sliding groove is provided on the support plate. The second sliding groove is arranged along the length direction of the support frame. The power motor is mounted on the support plate through a connecting frame and fixed on the connecting frame. The connecting frame is slidably connected to the second sliding groove and fixed to the support plate through a second positioning bolt.

[0019] To achieve the above technical solution, a second sliding groove is provided on the support plate, and the power motor is fixed to it via a connecting frame. This connecting frame can slide within the second sliding groove and is secured by a second positioning bolt. This significantly enhances the flexibility of the experimental platform in setting twisting parameters.

[0020] As a preferred embodiment of this utility model, a vertical plate is fixedly connected to the support frame, and a third sliding groove is provided on the vertical plate. The third sliding groove is arranged along the height direction of the support frame, and the support platform is slidably connected to the third sliding groove and fixed to the vertical plate by a third positioning bolt.

[0021] To achieve the above technical solution, a vertical plate is fixedly connected to the support frame, and a third sliding groove is provided on the vertical plate. This third sliding groove is positioned along the height of the support frame, allowing the support platform to slide along it and be securely fixed to the vertical plate by a third positioning bolt. This design enables precise height adjustment and locking of the support platform in the vertical direction, thereby greatly enhancing the vertical adjustment capability of the camera's shooting angle and field of view. This allows researchers to flexibly adjust the camera height according to experimental needs, ensuring that the machine vision system clearly and completely captures the dynamic behavior of the yarn at different vertical positions. This is crucial for obtaining more comprehensive three-dimensional motion data and improving the adaptability of the experimental platform and the accuracy of data acquisition.

[0022] As a preferred embodiment of this utility model, the support frame is provided with a fourth sliding groove along its own height direction, and a connecting block is fixedly connected to the outer wall of the LED lighting lamp. The connecting block is slidably connected to the fourth sliding groove and fixed to the support frame by a fourth positioning bolt.

[0023] To achieve the above technical solution, a fourth sliding groove is provided on the support frame along its height direction, and a connecting block fixedly connected to the outer wall of the LED light can slide within this fourth sliding groove and ultimately be fixed to the support frame by a fourth positioning bolt. This design allows for precise height adjustment and locking of the LED light along the vertical direction, ensuring optimal lighting effects in the twisting area.

[0024] As a preferred embodiment of this utility model, a support wheel is connected to the bottom wall of the support frame.

[0025] The above technical solution is achieved by connecting support wheels to the bottom wall of the support frame, allowing the entire experimental platform to be easily moved between different positions. This greatly enhances the convenience and deployability of the experimental platform. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0027] Figure 2 To illustrate the structural diagram of the connecting frame;

[0028] Figure 3 for Figure 2 Enlarged view of point A;

[0029] Figure 4 This is a schematic diagram illustrating the structure of the support platform.

[0030] Reference numerals: 1. Support frame; 2. LED lighting lamp; 3. Support platform; 4. Camera; 5. Twisting device; 6. Power motor; 7. Support plate; 8. Positioning protrusion; 9. Positioning recess; 10. Fixing rod; 11. Fixing part; 12. Limiting part; 13. Limiting ring groove; 14. First slide groove; 15. Support plate; 16. Second slide groove; 17. Connecting frame; 18. Vertical plate; 19. Third slide groove; 20. Fourth slide groove; 21. Connecting block; 22. Support wheel. Detailed Implementation

[0031] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0032] A machine vision-based experimental platform for analyzing yarn twisting motion includes a support frame 1, and further includes: an LED light 2, twisting devices 5, a support platform 3, and at least two cameras 4. The two twisting devices 5 are fixed to the support frame 1 and arranged opposite each other; one twisting device 5 is located on the top wall of the support frame 1, and the other twisting device 5 is located on the bottom wall of the support frame 1. The support frame 1 is an aluminum profile frame.

[0033] Yarn is connected between the two twisting devices 5.

[0034] The twisting device 5 includes a power motor 6, a support plate 7, and a fixing rod 10. The power motor 6 is connected to the support frame 1, and the power shaft of the power motor 6 is connected to the support plate 7, with the power shaft and the support plate 7 coaxially arranged. Six positioning protrusions 8 are integrally connected to the side of the support plate 7 opposite to the power motor 6, and the six positioning protrusions 8 are evenly distributed along the axis of the support plate 7. Positioning recesses 9 are formed on the positioning protrusions 8, and the cross-section of the positioning recesses 9 is a regular hexagon.

[0035] The fixing rod 10 includes an integrally formed fixing part 11 and a limiting part 12, and the cross-section of the fixing rod 10 is also hexagonal. A 90° bend is formed between the fixing part 11 and the limiting part 12. The fixing part 11 is fixedly connected to the positioning recess 9. A limiting annular groove 13 for fixing the yarn is formed on the limiting part 12, and multiple limiting annular grooves 13 are arranged along the length of the limiting part 12. One end of the yarn is fixed in the limiting annular groove 13 of the lower twisting device 5, and the other end of the yarn is fixed in the limiting annular groove 13 of the upper twisting device 5.

[0036] The power motor 6 is a servo motor.

[0037] The support frame 1 has a first groove 14 along its width direction, and a support plate 15 is slidably connected to the first groove 14 and fixed to the support frame 1 by a first positioning bolt (not shown in the figure).

[0038] A second sliding groove 16 is provided on the support plate 15, and the second sliding groove 16 is arranged along the length direction of the support frame 1. The power motor 6 is fixed on the connecting frame 17, and the connecting frame 17 is slidably connected to the second sliding groove 16 and fixed to the support plate 15 by a second positioning bolt (not shown in the figure).

[0039] A vertically arranged upright plate 18 is fixedly connected to the support frame 1. A third sliding groove 19 is provided on the upright plate 18, and the third sliding groove 19 is arranged along the height direction of the support frame 1. The support platform 3 is slidably connected to the third sliding groove 19 and fixed to the upright plate 18 by a third positioning bolt (not shown in the figure).

[0040] The support platform 3 supports the camera 4, which is a high-speed camera, and there are two cameras 4, located on the left and right sides of the upright plate 18, respectively. The camera 4 is used to film the yarn twisting process.

[0041] The support frame 1 has a fourth sliding groove 20 along its height direction. A connecting block 21 is fixedly connected to the outer wall of the LED lighting lamp 2. The connecting block 21 is slidably connected to the fourth sliding groove 20 and fixed to the support frame 1 by a fourth positioning bolt.

[0042] The cross-sections of the first slide 14, the second slide 16, the third slide 19, and the fourth slide 20 are all T-shaped.

[0043] LED lighting 2 provides illumination for the yarn twisting process.

[0044] Support wheels 22 are connected to the bottom wall of support frame 1. The support wheels 22 are heavy-duty omnidirectional, ensuring that the platform can move smoothly in any horizontal direction. Each support wheel 22 integrates a mechanical locking mechanism, which is braked by a foot-operated brake pedal.

[0045] Before the experiment begins, yarn needs to be prepared. The two ends of a single yarn are securely fixed to two twisting devices 5 located on the top and bottom walls of the support frame 1, respectively. Each twisting device 5 includes a servo motor, whose power shaft is coaxially connected to the support plate 7. Six positioning protrusions 8, evenly distributed along the axis, are integrally connected to the side of the support plate 7 facing away from the servo motor. These positioning protrusions 8 have positioning recesses 9 with a regular hexagonal cross-section. The fixing rod 10 has an integrally formed fixing part 11 and a limiting part 12 with a 90° bend between them. The fixing part 11 of the fixing rod 10 is precisely inserted into the positioning recesses 9, ensuring the stability of the yarn fixation. Simultaneously, multiple limiting annular grooves 13 are formed along the length of the limiting part 12 of the fixing rod 10 to securely fix the two ends of the yarn, preventing it from loosening during high-speed movement.

[0046] To precisely adjust experimental conditions, the platform is designed with multiple adjustment mechanisms:

[0047] 1. Lateral adjustment of the twisting device 5: The support frame 1 has a first sliding groove 14 along its own width direction, and the support plate 15 is slidably connected to it and fixed by the first positioning bolt. Since the power motor 6 is mounted on the support plate 15 through the connecting frame 17, this structure allows the entire twisting device 5 to move along the width direction of the support frame 1.

[0048] 2. Longitudinal fine-tuning of the power motor 6: A second sliding groove 16 is provided on the support plate 15, and the second sliding groove 16 is set along the length direction of the support frame 1. The power motor 6 is fixed on the connecting frame 17, the connecting frame 17 is slidably connected to the second sliding groove 16, and is fixed to the support plate 15 by the second positioning bolt. This allows the power motor 6 to be adjusted more precisely in longitudinal displacement on the support plate 15.

[0049] 3. Height adjustment of camera 4: A vertically arranged upright plate 18 is fixedly connected to the support frame 1. A third sliding groove 19 is provided on the upright plate 18, and the third sliding groove 19 is set along the height direction of the support frame 1. The support platform 3 is slidably connected to the third sliding groove 19 and fixed to the upright plate 18 by a third positioning bolt. Two high-speed cameras 4 are supported on the support platform 3 and are located on the left and right sides of the upright plate 18, respectively, for filming the yarn twisting process.

[0050] 4. Height adjustment of LED lighting lamp 2: The support frame 1 has a fourth slide groove 20 along its own height direction. A connecting block 21 is fixedly connected to the outer wall of the LED lighting lamp 2. The connecting block 21 is slidably connected to the fourth slide groove 20 and fixed to the support frame 1 by a fourth positioning bolt. All these T-shaped cross-section slide groove designs ensure the stability and accuracy of adjustment.

[0051] During the experiment, two twisting devices 5, precisely driven by servo motors, propelled the yarn through high-speed rotation and twisting. Simultaneously, LED lights 2 provided ample and uniform illumination to the twisting area. Two high-speed cameras 4 synchronously captured the instantaneous motion of the yarn during high-speed twisting in three-dimensional space from different perspectives at a high frame rate.

[0052] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A machine vision-based experimental platform for analyzing yarn twisting motion, comprising a support frame (1), characterized in that, Also includes: The system includes an LED light (2), a twisting device (5), a support platform (3), and at least two cameras (4). The two twisting devices (5) are fixed on the support frame (1) and arranged opposite each other. A yarn is connected between the two twisting devices (5). The support platform (3) is connected to the support frame (1) and is used to support the cameras (4). The cameras (4) are used to film the yarn twisting process. The LED light (2) is connected to the support frame (1) and is used to provide illumination for the yarn twisting process.

2. The experimental platform for yarn twisting motion analysis based on machine vision according to claim 1, characterized in that: The twisting device (5) includes a power motor (6), a support plate (7) and a fixing rod (10). The power motor (6) is connected to the support frame (1), and the power shaft of the power motor (6) is connected to the support plate (7). A plurality of fixing rods (10) are connected to the support plate (7) and arranged along the axis of the support plate (7). The fixing rods (10) are used to fix the yarn.

3. The experimental platform for yarn twisting motion analysis based on machine vision according to claim 2, characterized in that: The support plate (7) is connected to a positioning protrusion (8), and the positioning protrusion (8) is provided with a positioning recess (9). The fixing rod (10) includes a fixing part (11) and a limiting part (12). The fixing part (11) is fixedly connected to the positioning recess (9). The limiting part (12) is provided with a limiting ring groove (13) for fixing the yarn. A plurality of the limiting ring grooves (13) are arranged along the length direction of the limiting part (12).

4. The experimental platform for yarn twisting motion analysis based on machine vision according to claim 2, characterized in that: The support frame (1) has a first sliding groove (14) along its width direction. A support plate (15) is slidably connected to the first sliding groove (14). The support plate (15) is fixed to the support frame (1) by a first positioning bolt. The power motor (6) is connected to the support plate (15).

5. The experimental platform for yarn twisting motion analysis based on machine vision according to claim 4, characterized in that: The support plate (15) is provided with a second sliding groove (16), which is arranged along the length of the support frame (1). The power motor (6) is mounted on the support plate (15) through a connecting frame (17). The power motor (6) is fixed on the connecting frame (17). The connecting frame (17) is slidably connected to the second sliding groove (16) and fixed to the support plate (15) through a second positioning bolt.

6. The experimental platform for yarn twisting motion analysis based on machine vision according to claim 1, characterized in that: A vertical plate (18) is fixedly connected to the support frame (1). A third sliding groove (19) is provided on the vertical plate (18). The third sliding groove (19) is set along the height direction of the support frame (1). The support platform (3) is slidably connected to the third sliding groove (19) and fixed to the vertical plate (18) by a third positioning bolt.

7. The experimental platform for yarn twisting motion analysis based on machine vision according to claim 1, characterized in that: The support frame (1) has a fourth slide groove (20) along its height direction. A connecting block (21) is fixedly connected to the outer wall of the LED lighting lamp (2). The connecting block (21) is slidably connected to the fourth slide groove (20) and fixed to the support frame (1) by the fourth positioning bolt.

8. A machine vision-based experimental platform for analyzing yarn twisting motion according to any one of claims 1-7, characterized in that: Support wheels (22) are connected to the bottom wall of the support frame (1).

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