A non-contact yarn twisting motion analysis experimental platform based on machine vision

Abstract

This invention discloses a non-contact yarn twisting motion analysis experimental platform based on machine vision, comprising a frame module, a yarn twisting device, and an optical observation module. The frame module is a three-dimensional rectangular aluminum profile frame, forming the main structure of the experimental platform. The yarn twisting device includes a base, a back plate, a rotating mechanism, a plying mechanism, and a take-up mechanism, and the speed of yarn twisting is controlled by a drive motor. The optical observation module includes an LED light, a high-speed camera, and a universal bracket, and is used to capture images of yarn motion within the yarn twisting area. This platform, through non-contact optical measurement, can accurately study the yarn twisting motion law, meeting the testing and analysis needs under different fiber types and spinning speeds, and providing reliable experimental basis for optimizing the twisting process, reducing production losses, and achieving mass production of high-quality yarn.

Description

Technical Field

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

[0002] Yarn twisting is a core process in textile production. By twisting fiber slivers or single yarns to form a helical structure, it enhances key properties such as strength and abrasion resistance, directly determining the quality of woven products. Precise control of core parameters such as twist and twist direction is crucial for optimizing the process and achieving mass production of high-quality yarn. Therefore, constructing an efficient and precise experimental platform for analyzing yarn twisting motion is of great significance for technological upgrading in the textile industry.

[0003] Current yarn twisting parameter detection methods are mainly divided into two categories: contact and non-contact. Traditional contact-type equipment measures the yarn twist by clamping it, and can only measure the static twist after twisting, but cannot measure the dynamic parameters during the twisting process. Existing technology publication CN219065269U proposes a yarn twist detection device that uses a mechanical clamping structure at both ends and a rotating untwisting mechanism, achieving offline, static, and accurate measurement of yarn twist. However, compared to non-contact methods, it cannot dynamically detect the twisting process, is prone to damaging the yarn, and cannot perform continuous online testing, exhibiting significant limitations in real-time performance and non-destructive testing. Summary of the Invention

[0004] To overcome the drawbacks of contact measurement, this invention provides a non-contact yarn twisting motion analysis experimental platform based on machine vision. This platform can meet the needs of machine vision for testing and analyzing the motion states of fibers under different fiber types and spinning speeds during yarn twisting. It can provide reference data for optimizing the twisting process, reducing production losses, and achieving high-quality yarn mass production.

[0005] This invention is a non-contact yarn twisting motion analysis experimental platform based on machine vision, comprising: a frame module, a yarn twisting device, and an optical observation module; the frame module is constructed of aluminum profiles; the yarn twisting device is mounted on the frame module and includes a base and a back plate, the back plate being fixedly mounted on the base on the side away from the optical observation module; the base is provided with a rotating mechanism for driving yarn movement and a plying mechanism for merging twisted yarns; the back plate is provided with a take-up mechanism for winding yarn; a single strand of yarn is placed on a turntable in the rotating mechanism via a shaft; the rotating mechanism and the plying mechanism work together to merge and twist multiple strands of yarn, and then the take-up mechanism evenly winds the merged yarn to wind it up; the optical observation module is mounted on the frame module and is used to capture yarn motion images within the yarn twisting action area.

[0006] Preferably, the optical observation module includes an LED light, a high-speed camera, and a universal bracket; the LED light is mounted on the frame module via a movable slide rail, and the LED light can move along the length of the movable slide rail and adjust its position within the frame module; the high-speed camera is mounted on the universal bracket, and the universal bracket is used to adjust the position and attitude of the high-speed camera.

[0007] Preferably, the frame module is made of aluminum profiles. Using aluminum profiles to construct the experimental platform frame can take advantage of its high strength-to-weight ratio, ensuring sufficient structural rigidity for precision optical measurements while effectively reducing the overall weight of the platform, facilitating movement and deployment. The standardized T-slot structure provides excellent modular design freedom, enabling rapid assembly of the platform, subsequent functional expansion or structural adjustment, and facilitating flexible installation and precise positioning of various functional modules. In addition, the good corrosion resistance of aluminum profiles also ensures the long-term stability and durability of the frame under normal experimental environments.

[0008] Preferably, the yarn twisting device can simulate the yarn twisting process and can adjust the yarn twisting speed through a motion controller, thus presenting different yarn twisting effects according to different fiber types and different spinning speeds.

[0009] Preferably, the rotating mechanism includes a drive motor, a first gear, multiple second gears, multiple central rotating shafts, and multiple turntables. The drive motor is fixedly installed at the bottom end of the base. The output end of the drive motor passes through the bottom end of the base and is fixedly fitted with the first gear. The first gear meshes with multiple second gears. The multiple central rotating shafts are each fixedly fitted with a second gear and a turntable. The multiple turntables are located at the top side of the multiple second gears.

[0010] Based on the above structure, the drive motor is used as the power output to drive the first gear to rotate. The second gear rotates due to meshing, which drives the central shaft to rotate. This causes multiple turntables to rotate synchronously and at the same speed along multiple central shafts. The single strand of yarn is fixedly installed on the top of the turntable through the shaft. The turntable drives the shaft to rotate, which twists each strand of yarn to a certain extent, making it easier for the multiple strands of yarn to not disperse after plying, thus effectively improving the quality of the plyed yarn.

[0011] Preferably, the upper end of the base is provided with a rotating groove, and an internal gear is fixedly installed in the rotating groove at the upper end of the base. The internal gear is coaxially arranged with the first gear and surrounds the outer periphery of the first gear. Multiple second gears are rotatably installed in the rotating groove, and the internal gear meshes with multiple second gears respectively.

[0012] Furthermore, by setting the internal gear, the two sides of the multiple second gears mesh with the first gear and the internal gear simultaneously, so that the multiple second gears are relatively balanced in force, ensuring that the multiple central rotating shafts fixedly connected to the second gears rotate smoothly and the mechanism operates smoothly.

[0013] Preferably, each of the central rotating shafts has an external thread structure at its top end and is screwed with a locking nut and a protective cap. The outer side wall of each of the protective caps is smooth, and the bottom outer side wall is respectively fitted with the corresponding locking nut.

[0014] Furthermore, the winding cylinder is sleeved and installed on the central rotating shaft, so that the bottom side of the cylinder contacts the top of the turntable. The cylinder is fixed on the turntable by rotating the locking nut on the external thread. The bottom ends of multiple protective caps are attached to the corresponding locking nuts and the locking nuts are pressed by rotating the locking nuts on the external thread. Through its smooth structure, the yarn can smoothly pass through the protective caps during twisting, preventing it from sticking or getting caught with the surrounding parts, which would cause the yarn to be pulled and damaged.

[0015] Preferably, the twisting mechanism includes a column, a guide disc, first guide holes, a support crossbeam, and a coil. The column is fixedly welded to the center of the top side of the first gear. The guide disc is fixedly installed on the top of the column. Multiple first guide holes are evenly distributed on the guide disc. The support crossbeam is fixedly installed in the middle of the front end of the back plate, directly above the guide disc. A coil is distributed on the support crossbeam. The yarn is passed through the corresponding first guide holes in sequence, and then multiple strands of yarn are passed through the coil. The drive motor is started to drive the guide disc to rotate, so that the multiple strands of yarn can be twisted and wound up.

[0016] Preferably, the take-up mechanism includes a fixed cross plate, a first guide roller, an open box, a support, a second guide roller, a take-up drum, and a take-up motor. The two fixed cross plates are fixedly installed on the left and right sides of the upper front end of the back plate. The first guide roller is rotatably installed between the two fixed cross plates. The open box is fixedly installed between the two fixed cross plates. A guide plate is formed on the top surface of the open box, and a guide groove is formed on its side. The guide groove is semi-circular in shape. A second guide hole is formed on the guide plate. The support is fixedly installed on the upper end of the fixed cross plate. The yarn roller is rotatably mounted on the support, and the take-up drum is rotatably mounted on the upper part of the back plate. The input end of the take-up drum is connected to the output end of the take-up motor. After the multiple strands of yarn are combined, they pass through the first guide roller and are introduced through the guide groove on the open box, which can keep the yarn tension and prevent slack. Then, they are led out through the second guide ring and then through the second guide roller, which plays the role of guiding the yarn and changing the yarn tension, so that the take-up work is flat and smooth. Finally, after being fixed on the take-up drum, the take-up motor is started to drive the take-up drum to rotate, so that the multiple strands of yarn are combined and wound on the take-up drum.

[0017] Preferably, the LED lighting fixture is mounted on the frame via a movable slide rail, allowing the lighting position to be adjusted along the length of the slide rail. Operators can easily adjust the light source position along the length of the movable slide rail to achieve optimal lighting for different camera shooting angles.

[0018] Preferably, the high-speed camera is equipped with a high frame rate imaging system for capturing high-speed dynamic details.

[0019] The beneficial effects of this invention are as follows: Through the coordinated operation of the frame module, yarn twisting device, and optical observation module, non-contact observation of the yarn is achieved, effectively avoiding mechanical damage and motion interference to the yarn caused by traditional clamping equipment, and ensuring the authenticity of the yarn's movement under natural twisting conditions. The universal bracket supports multi-degree-of-freedom translation / rotation of the high-speed camera, enabling focusing at any angle; the LED lighting lamp is axially adjustable via a slide rail to meet the needs of different lighting scenarios; dual drive motors, in conjunction with a motion controller, can independently adjust the speed of the rotating mechanism and the take-up mechanism, simulating twisting conditions of different fiber types (such as cotton and chemical fibers) and spinning speeds (low to high). By comparing yarn motion images under different fiber types and twisting speeds, parameters such as yarn position, posture, and acceleration can be extracted, and key indicators such as twist uniformity and plying effect can be quantitatively analyzed, providing comprehensive data support for the study of twisting mechanisms and revealing the root causes of process defects. Experimental data can be directly used to calibrate twisting equipment parameters, optimize production efficiency and yarn strength, and promote high-quality production in the textile industry. Attached Figure Description

[0020] Figure 1 This is a panoramic structural schematic diagram of a non-contact yarn twisting motion analysis experimental platform based on machine vision according to the present invention. Figure 2 This is a schematic diagram of the yarn twisting device; Figure 3 This is a front cross-sectional view of the yarn twisting device. Figure 4 This is a schematic diagram of the left-side cross-sectional structure of the yarn twisting device; Figure 5 This is a schematic diagram of a single-strand yarn rotary twisting mechanism; Figure 6 This is a schematic diagram of an open box structure.

[0021] Reference numerals: 1. Frame module; 2. Yarn twisting device; 3. High-speed camera; 4. Universal bracket; 5. Movable slide rail; 6. LED lighting; 7. Base; 8. Back plate; 9. Drive motor; 10. Rotating groove; 11. First gear; 12. Second gear; 13. Internal gear; 14. Central shaft; 15. Turntable; 16. Shaft cylinder; 17. Locking nut; 18. Protective cap; 19. Column; 20. Conductor disc; 21. First conductor hole; 22. Support crossbeam; 23. Coiling coil; 24. Fixed crossbeam; 25. First conductor roller; 26. Opening box; 27. Conductor groove; 28. Conductor plate; 29. ​​Second conductor hole; 30. Support; 31. Second conductor roller; 32. Take-up drum; 33. Take-up motor. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6 The specific embodiments of the present invention will be further described in detail to make the technical solution of the present invention easier to understand and master.

[0023] This embodiment discloses a non-contact yarn twisting motion analysis experimental platform based on machine vision. It is an integrated device used to accurately study the yarn twisting motion law under controlled yarn twisting speed conditions through non-contact optical measurement methods. The platform consists of the following three functional modules and their internal components: 1. Framework Module The frame module 1 provides structural support and spatial layout benchmarks for the entire platform, and its design ensures the overall rigidity and operational stability of the system. Frame module 1 is a three-dimensional spatial structure tightly assembled from multiple aluminum profiles using high-strength bolts and specialized connectors, specifically exhibiting a stable rectangular configuration. Frame module 1 includes a bottom base, four vertical columns, and a top beam structure, creating an internal workspace to accommodate the core experimental components. The selection and connection methods of all aluminum profiles ensure that the frame possesses sufficient load-bearing capacity and deformation resistance, providing a foundation for stable experimental operation.

[0024] 2. Yarn twisting device The yarn twisting device 2 is responsible for simulating the yarn twisting process during the experiment and controlling the speed of yarn twisting. For example... Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the bottom end of the base 7 has a slot for fixing it to the bottom base of the frame module 1. The back plate 8 is fixedly installed on the base 7 away from the optical observation module. The drive motor 9 is fixedly installed at the bottom end of the base 7. The output end of the drive motor 9 passes through the bottom end of the base 7 and is fixedly fitted with a first gear 11. The upper end of the base 7 has a rotating groove 10. Second gears 12 are evenly placed at the edge of the rotating groove 10. Multiple second gears 12 mesh with the first gears 11. Multiple central rotating shafts 14 are fixedly fitted with second gears 12 and turntables 15. Multiple turntables 15 are located at the top side of multiple second gears 12. An internal gear 13 is provided at the inner edge of the rotating groove. The internal gear 13 is coaxial with the first gear 11 and surrounds the outer periphery of the first gear 11. The internal gear 13 meshes with multiple second gears 12. The column 19 is fixedly welded. At the center of the top side of the first gear 11, the wire disc 20 is fixedly installed on the top of the column 19. The wire disc 20 has evenly spaced first wire holes 21. The support crossbeam 22 is fixedly installed at the center of the front end of the back plate 8, directly above the wire disc 20. The support crossbeam 22 has a coil 23. The fixed crossbeam 24 is fixedly installed on the left and right sides of the upper front end of the back plate 8. The first wire roller 25 is rotatably installed between the two fixed crossbeams 24. The open box 26 is fixedly installed between the two fixed crossbeams 24. The top surface of the open box 26 has a wire plate 28, and the side has a wire groove 27. The wire groove 27 is semi-circular. The wire plate 28 has a second wire hole 29. The support 30 is fixedly installed on the upper end of the fixed crossbeam 24. The second wire roller 31 is rotatably installed on the support 30. The take-up drum 32 is rotatably installed on the upper end of the back plate 8. The input end of the take-up drum 32 is connected to the output end of the take-up motor 33.

[0025] The drive motor 9 drives the first gear 11 to rotate, causing multiple second gears 12 to revolve and rotate around the first gear 11. Multiple central shafts 14 and turntables 15 rotate synchronously at the same speed, causing different strands of yarn to twist into a certain single strand. The guide disc 20, which rotates synchronously and at the same speed as the first gear 11, guides the multiple strands of yarn to be twisted together. The twisted yarn passes through the coil 23 and is wound onto the take-up drum 32 by the take-up mechanism and the take-up motor 33.

[0026] 3. Optical observation module The optical observation module utilizes advanced optical imaging technology to capture and record the instantaneous motion of the yarn during the twisting process of multi-strand yarn in a non-contact, high-resolution manner. A professional-grade high-speed camera 3 is equipped with a high-frame-rate imaging system for capturing high-speed dynamic details. The high-speed camera 3 can continuously capture image sequences at a frame rate of thousands of frames per second or even higher, ensuring clear recording of the fine dynamic processes such as rotation and deformation of the yarn during high-speed twisting.

[0027] The high-speed camera 3 is fixedly mounted on a precision pan-tilt head using a standard structure. The pan-tilt head is mounted on a provided gimbal 4, offering manual adjustment with at least two degrees of freedom: pitch and yaw, and featuring a locking function for precise composition and focusing. The gimbal 4 has multi-degree-of-freedom adjustment capabilities, allowing for manual translation within a three-dimensional Cartesian coordinate system and angular adjustment along three rotation axes. All adjustments are equipped with scale indicators and locking devices to ensure accurate and stable position and orientation after adjustment.

[0028] To provide high-intensity, uniform, stable, and flicker-free illumination for the high-speed camera 3, an LED light 6 is configured. This LED light 6 is mounted on one or more movable slide rails 5, which are fixedly mounted on the top or side crossbeams of the frame module 1. The back of the LED light 6 is fixedly mounted on a slider, allowing it to slide freely along the entire length of the slide rail and lock into any position. The light source can be flexibly arranged according to experimental needs, enabling the high-speed camera 3 to acquire clear observation images.

[0029] In this embodiment, the workflow is mainly divided into five parts: experimental preparation and platform configuration, yarn twisting device configuration, camera and lighting configuration, experimental execution and data acquisition and post-processing.

[0030] Experimental Preparation and Platform Configuration: First, the core component of the experimental platform, the yarn twisting device 2, is fixedly installed on the bottom base of the frame module 1 via a bottom slot. Then, the universal bracket 4 is installed on the frame. Depending on the yarn twisting area to be observed in the experiment, the operator precisely adjusts the three-dimensional position and spatial attitude of the high-speed camera 3 mounted on it within the working space of the frame module 1 using the manual or drive mechanism of the universal bracket 4. After adjustment, all adjustment axes of the universal bracket 4 are locked to ensure the high-speed camera 3 maintains a constant position and attitude during the experiment. Next, the operator adjusts the pan-tilt head fixed to the high-speed camera 3, changing the camera's pitch and yaw angles, and adjusting its front-to-back position or height to ensure the camera's field of view precisely covers the yarn twisting motion area. Precise focusing is then performed to ensure clear imaging of the target area. After adjustment, the pan-tilt head is locked. Finally, the prepared yarn sample meeting the experimental requirements is wound onto the shaft cylinder 16.

[0031] Configuration of the yarn twisting device: The winding cylinder 16 is fixedly mounted on the turntable 15 by locking with a locking nut 17 and a protective cap 18. The drive motor 9 is started, driving the first gear 11 to rotate. Multiple second gears 12 in the rotating groove 10 on the top side of the base 7 mesh with the first gear 11, revolving around the first gear 11 and rotating on their own axis, respectively. This drives multiple central shafts 14 to rotate, causing multiple turntables 15 to rotate synchronously and at the same speed along the multiple central shafts 14, thus twisting each strand of yarn to a certain extent. The twisting process makes it easier for the multi-strand yarns to disperse after plying, effectively improving the quality of the plyed yarn. The multi-strand yarns pass through the corresponding first guide hole 21. As the first gear drives the guide disc to rotate, the multi-strand yarns can be plyed, significantly improving the yarn strength and uniformity. The plyed yarns pass through the coil 23, the first guide roller 25, the guide groove 27, the second guide hole 29, and the second guide roller 31 in sequence. After being fixed on the take-up drum 32, the take-up motor 33 is started to drive the take-up drum 32 to rotate, so that the plyed yarns can be wound on the take-up drum 32.

[0032] Configure camera and lighting: Set the operating parameters of the high-speed camera 3 in the software: select the required resolution, set a higher frame rate, accurately set the exposure time to obtain a clear image, set the trigger mode and the predetermined recording duration or number of recording frames, configure the storage path of experimental data, file name generation rules, etc.; then set the brightness and angle of the adjustable LED light 6, and adjust its position axially through the movable slide rail 5 to meet the lighting conditions required for camera recording, ensuring that a clear recorded image can be obtained.

[0033] Experimental Execution: After configuring the relevant components of the experimental platform, the high-speed camera 3 and the yarn twisting device 2 were started. The drive motor selected was the Huichuan MS1H1-10C30CB-A331Z, rated at 3000r / min and maximum at 9000r / min, with a 23-bit absolute encoder and a rated power of 1kW. The driver selected was the SV660PS5R5I (pulse type), powered by 220V unidirectional power supply, with good matching of motor parameters. The motion controller selected was the Huichuan H3U-1616MT, which has 4 channels of 200kHz high-speed pulse output and can directly drive the SV660P pulse type driver, supporting JOG jogging, constant speed operation, and multi-segment speed gradient settings, with good matching of the twist-speed correspondence control requirements of the twisting experiment. Three yarn twisting speeds were set, and yarn twisting images of one fiber type under different twisting speed conditions were captured. Subsequently, three different fiber types were selected, and yarn twisting images were captured at the same yarn twisting speed.

[0034] Data Acquisition and Post-Processing: After the experiment, the digital video files or image sequence files containing a large number of image frames captured by the high-speed camera 3 are automatically saved to the designated data storage location. The operator then exports the acquired raw image data from the experimental platform to a dedicated data analysis workstation.

[0035] In this embodiment, the acquired data is processed using specialized image processing software as follows: Image preprocessing: 5×5 Gaussian filtering was used to remove salt and pepper noise, adaptive histogram equalization was used to enhance the contrast between the yarn and the background, and radial distortion correction was completed by combining the distortion coefficients (k1=-0.12, k2=0.08) obtained from camera calibration. The distortion error of the corrected image is < 0.2 pixels.

[0036] Target recognition and segmentation: Based on the improved U-Net semantic segmentation model (training set contains 5000 labeled images), the yarn outline is accurately extracted from complex backgrounds. The recognition accuracy reaches 98.7% under different illumination intensities (500–2000 lux), and the single frame processing time is <10ms.

[0037] Feature extraction and tracking: The centroid coordinates of the yarn are extracted by LK optical flow method (accuracy ±0.1mm), and cross-frame tracking is achieved by combining Kalman filtering. The temporal evolution sequence of yarn position and attitude (torsion angle) is constructed, and the tracking loss rate is <0.5%.

[0038] Motion parameter calculation: The instantaneous velocity (v=Δx / Δt) and acceleration (a=Δv / Δt) of the yarn are calculated using the central difference method, and the angular velocity is obtained by the second derivative of the attitude angle.

[0039] Statistical analysis of the calculated parameters revealed the motion patterns and characteristics under different twisting speeds and fiber types, clarifying a significant correlation between twisting speed and fiber type on the yarn twisting effect. Firstly, twisting speed directly affects yarn motion stability: at a high speed of 9000 r / min, the yarn tracking success rate drops to 94.5%, and the acceleration fluctuation is 2.8 times that at 3000 r / min, easily leading to uneven twisting and hair lifting; at around 6000 r / min, the yarn tracking success rate reaches 97.8%, the acceleration variation coefficient is controlled within 0.10, and the twisting uniformity is optimal. Secondly, the difference in fiber rigidity determines the stability of twisting: at the same twisting speed, polyester yarn has the best recognition accuracy (98.7%) and acceleration coefficient of variation (0.08), exhibiting the best shape retention and twisting stability; viscose fiber yarn (96.8% recognition accuracy, 0.11 coefficient of variation) is second best; cotton fiber yarn, due to its strong flexibility and easy deformation, is most significantly affected by twisting speed, with a recognition accuracy of 95.3% and acceleration coefficient of variation of 0.15. The above quantitative analysis clarifies the intrinsic relationship between yarn motion and the three sets of twisting speeds and the three fiber types, deepens the understanding of the yarn twisting and plying mechanism, and verifies the theoretical model and numerical simulation results. This provides detailed experimental data for targeted optimization of twisting processes for different fiber yarns, reducing production losses, and achieving mass production of high-quality yarns.

[0040] Of course, the above are just typical examples of the present invention. In addition, the present invention may have many other specific embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims

1. A non-contact yarn twisting motion analysis experimental platform based on machine vision, characterized in that, include: Frame module (1), yarn twisting device (2), optical observation module; The frame module (1) is made of aluminum profile; the yarn twisting device (2) is installed on the frame module (1), the yarn twisting device (2) includes a base (7) and a back plate (8), the back plate (8) is fixedly installed on the base (7) on the side away from the optical observation module, the base (7) is provided with a rotating mechanism for driving the yarn movement and a twisting mechanism for merging twisted yarn, the back plate (8) is provided with a winding mechanism for winding the yarn; the optical observation module is set on the frame module (1) and is used to capture the yarn movement image in the yarn twisting action area.

2. The non-contact yarn twisting motion analysis experimental platform based on machine vision according to claim 1, characterized in that, The optical observation module includes an LED lighting lamp (6), a high-speed camera (3), and a universal bracket (4); the LED lighting lamp (6) is mounted on the frame module (1) via a movable slide rail (5), and the LED lighting lamp (6) can move along the length of the movable slide rail (5) and adjust its position within the frame module (1); the high-speed camera (3) is mounted on the universal bracket (4), and the universal bracket (4) is used to adjust the position and attitude of the high-speed camera (3).

3. The non-contact yarn twisting motion analysis experimental platform based on machine vision according to claim 1, characterized in that, The rotating mechanism includes a drive motor (9), a first gear (11), multiple second gears (12), multiple central rotating shafts (14), and multiple turntables (15). The drive motor (9) is fixedly installed at the bottom end of the base (7). The output end of the drive motor (9) passes through the bottom end of the base (7) and is fixedly fitted with the first gear (11). The first gear (11) meshes with multiple second gears (12) respectively. Each of the multiple central rotating shafts (14) is fixedly fitted with a corresponding second gear (12) and a turntable (15). The multiple turntables (15) are located at the top side of the multiple second gears (12).

4. The non-contact yarn twisting motion analysis experimental platform based on machine vision according to claim 1, characterized in that, The upper end of the base (7) is provided with a rotating groove (10). An internal gear (13) is fixedly installed in the rotating groove (10) at the upper end of the base (7). The internal gear (13) is coaxially arranged with the first gear (11) and the internal gear (13) surrounds the outer circumference of the first gear (11). A plurality of second gears (12) are rotatably installed in the rotating groove (10). The internal gear (13) meshes with the plurality of second gears (12) respectively.

5. The rotating mechanism according to claim 3, characterized in that, Each of the central rotating shafts (14) has an external thread structure near its top end, and each of the external thread structures is screwed with a locking nut (17). Each of the central rotating shafts (14) has a protective cap (18) screwed to its top end. The outer walls of each of the protective caps (18) are smooth, and the bottom outer walls are respectively in contact with the corresponding locking nuts (17).

6. The non-contact yarn twisting motion analysis experimental platform based on machine vision according to claim 1, characterized in that, The combined structure includes a column (19), a wire disc (20), a first wire hole (21), a support crossbeam (22), and a coil (23). The column (19) is fixedly welded to the center of the top side of the first gear (11). The wire disc (20) is fixedly installed on the top of the column (19). The wire disc (20) is evenly provided with a plurality of first wire holes (21). The support crossbeam (22) is fixedly installed in the middle of the front end of the back plate (8), located directly above the wire disc (20). The coil (23) is provided on the support crossbeam (22).

7. The non-contact yarn twisting motion analysis experimental platform based on machine vision according to claim 1, characterized in that, The take-up mechanism includes a fixed horizontal plate (24), a first guide roller (25), an open box (26), a support (30), a second guide roller (31), a take-up drum (32), and a take-up motor (33). The two fixed horizontal plates (24) are fixedly installed on the left and right sides of the upper front end of the back plate (8). The first guide roller (25) is rotatably installed between the two fixed horizontal plates (24). The open box (26) is fixedly installed between the two fixed horizontal plates (24). A guide plate (28) is provided on the top surface of the open box (26), and a guide groove (27) is provided on the side. The guide groove (27) is semi-circular. A second guide hole (29) is provided on the guide plate (28). The support (30) is fixedly installed on the upper end of the fixed horizontal plate (24). The second guide roller (31) is rotatably installed on the support (30). The take-up drum (32) is rotatably installed on the upper end of the back plate (8). The input end of the take-up drum (32) is connected to the output end of the take-up motor (33).

8. The optical observation module according to claim 2, characterized in that, The high-speed camera (3) is equipped with a high frame rate imaging system for capturing high-speed dynamic details.

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