A conveyor based on the stability of elastic yarn tension

Abstract

This utility model discloses a conveyor based on the stable tension of elastic yarn, belonging to the field of textile machinery technology. The conveyor includes a housing, and a yarn feeding assembly, a tensioner, a tension detection module, and a control module mounted on the housing. The tensioner is located at the inlet end of the housing and pre-tensions the input elastic yarn; the tension detection module is located at the outlet end of the housing and is used to detect the real-time tension of the output yarn; the control module is electrically connected to both the tension detection module and the yarn feeding assembly, receiving tension signals and adjusting the rotational speed of the yarn feeding assembly accordingly, thus forming a closed-loop control system. This utility model, through the synergistic effect of pre-tensioning, real-time detection, and feedback control, can actively and quickly counteract tension fluctuations, ensuring that the elastic yarn maintains constant tension during conveying, effectively solving the textile quality problems caused by unstable tension, and has the advantages of high control precision, good stability, and strong adaptability.

Description

Technical Field

[0001] This utility model relates to the field of textile machinery technology, and in particular to a conveyor based on the stable tension of elastic yarn. Background Technology

[0002] In the textile industry, yarn transport is a crucial step in weaving and knitting processes, and the stability of yarn tension directly affects the quality of textiles. This is especially true for elastic yarns (such as spandex), which, due to their high elasticity and malleability, are more susceptible to speed variations, frictional resistance, or external disturbances during transport, leading to tension fluctuations. Unstable tension can cause problems in textiles such as uneven texture, shrinkage, yarn breakage, or other defects, reducing product consistency and yield.

[0003] Existing yarn conveyors typically employ mechanical tensioning devices (such as spring clamps or rocker arm structures) to initially tension the yarn, for example, by providing tension control through fixed-position guide rollers or friction plates. However, most of these devices lack real-time feedback mechanisms and cannot adapt to the dynamic changes in yarn during high-speed transport. When the yarn input speed, diameter, or environmental conditions change, mechanical tensioning alone often fails to maintain constant tension, easily resulting in excessively high or low tension. Furthermore, while some advanced conveyors incorporate simple sensors, they are usually complex in structure, expensive, and have slow adjustment responses, making it difficult to meet the accuracy and real-time requirements of elastic yarns.

[0004] Therefore, there is a need in this field for a yarn conveyor with a reasonable structure and rapid response, which can detect the tension of the output yarn in real time and automatically adjust the yarn feeding speed through closed-loop control, thereby ensuring that the elastic yarn maintains a stable tension range during the conveying process and improving the overall quality of textiles. Utility Model Content

[0005] This application provides a conveyor based on the stabilization of elastic yarn tension to solve the technical problem in the prior art where the lack of an effective real-time feedback and dynamic adjustment mechanism during the conveying process of elastic yarn leads to large tension fluctuations and inaccurate control, thus affecting the quality of textiles. To achieve the above objective, the following technical solution is provided: a conveyor based on the stabilization of elastic yarn tension, comprising: The housing, on which a yarn feeding assembly for conveying yarn is mounted, and the conveyor also includes: The tensioner is located at the inlet end of the machine housing and is used to pre-tension the elastic yarn input to the yarn feeding assembly. Tension detection module, which is set at the outlet end of the machine housing, is used to detect the tension of the elastic yarn after it has been conveyed by the yarn feeding assembly; The control module is mounted on the machine housing and is electrically connected to the tension detection module and the yarn feeding assembly. It is used to receive the tension signal from the tension detection module and adjust the speed of the yarn feeding assembly according to the signal.

[0006] Specifically, the tension detection module includes a mounting housing, a bushing fixedly installed inside the mounting housing, a rotating shaft rotatably installed inside the bushing, and a yarn swing rod for yarn passing around fixedly connected to the peripheral wall of the rotating shaft; A torsion spring is provided between the rotating shaft and the mounting housing to provide reset torque; A notch is provided on the side wall of the bushing, and the initial position of the yarn swing rod abuts against one side wall of the notch.

[0007] Specifically, a radial magnet is embedded at one end of the rotating shaft, and an angle sensing chip is set on the side wall of the mounting housing corresponding to the radial magnet. When the radial magnet rotates with the rotating shaft, the change in its magnetic field is detected by the angle sensing chip.

[0008] Specifically, the angle sensing chip is a Hall element.

[0009] Specifically, the mounting housing consists of a first housing and a second housing that are interlocked and fixed together, and the bushing is clamped and fixed between the first housing and the second housing; One end of the second housing has an annular positioning groove, and a positioning scale is also provided on the second housing via a bearing. One end of the torsion spring is fixed to the positioning scale, which has a protrusion that engages with the positioning tooth groove. The initial installation angle of the yarn swing rod is adjusted by rotating and locking the positioning scale.

[0010] Specifically, the tensioner includes a mounting block fixed to the housing, a wire inlet hole on the mounting block, and a first tensioning arm and a second tensioning arm that can swing relative to each other, which are hinged to the mounting block by a pin.

[0011] Specifically, the first tensioning arm has a first toothed pair at one end near the hinge point, and the second tensioning arm has a second toothed pair at one end near the hinge point that meshes with and drives the first toothed pair, so that the first tensioning arm and the second tensioning arm swing in opposite directions.

[0012] Specifically, both the mounting block and the first tensioning arm are equipped with loops for guiding the yarn; The mounting block has a preload pin threaded on its side. Rotating the preload pin will cause its end to press against the first tension arm and / or the second tension arm to fix its swing angle.

[0013] Specifically, the tensioner also includes a yarn baffle fixed to the side of the mounting block near the inlet hole to prevent the yarn from slipping off.

[0014] Specifically, the yarn feeding assembly includes a motor fixed inside the machine housing, a yarn feeding wheel mounted on the output shaft of the motor, and a yarn separating rod for evenly distributing the yarn at the inlet end of the machine housing.

[0015] The beneficial effects of this utility model are: This invention constructs a collaborative system of "pre-tensioning, real-time detection, and closed-loop feedback," utilizing signals from the tension detection module to control the rotational speed of the yarn feeding assembly, thus forming a dynamic adjustment closed loop. This solution upgrades passive mechanical control to active intelligent control, enabling millisecond-level response and offsetting various tension fluctuations, stabilizing the output tension within an extremely narrow range (generally, controlling the yarn tension within ±0.2CN). This solves the problem of fabric defects caused by unstable tension in elastic yarns, significantly improving the quality consistency and yield of superior products in textiles.

[0016] The tension detection module employs a non-contact sensing scheme using radial magnets and Hall elements, avoiding mechanical wear and achieving high-precision, high-reliability signal conversion. Simultaneously, a lockable positioning scale structure allows for convenient adjustment of the initial installation angle of the yarn swing arm, thereby improving product consistency. This solution enables the same equipment to quickly adapt to tension detection requirements of different yarns and processes, significantly enhancing the equipment's versatility and application range while ensuring long-term measurement accuracy.

[0017] The tensioner employs a double-tensioning arm design with gear meshing and linkage, achieving symmetrical balance of tension force, and the pretension force is intuitively locked through a pretensioning pin mechanism. Combined with auxiliary designs such as the yarn-separating rod of the yarn feeding assembly and the overall yarn-blocking disc, it ensures stable yarn path. It provides stable pretension force, effectively preventing yarn slippage and tangling, improving the reliability and continuity of system operation, and the adjustment method is simple and intuitive, making the equipment easy to operate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the appearance of this utility model; Figure 2 This is an exploded view of the present invention; Figure 3 This is an exploded view of the tension detection module in this utility model; Figure 4 This is a cross-sectional view of the internal structure of the tension detection module in this utility model; Figure 5 This is an exploded schematic diagram of the tensioner in this utility model.

[0019] The attached figures are labeled as follows: 10. Machine housing; 20. Yarn feeding assembly; 21. Motor; 22. Yarn feeding roller; 23. Yarn separating rod; 30. Tensioner; 31. Mounting block; 32. First tensioning arm; 32a. First gear pair; 33. Second tensioning arm; 33a. Second gear pair; 34. Preload pin; 35. Wire loop; 40. Tension detection module; 41. Mounting housing; 41a. First housing; 41b. Second housing; 41c. Positioning groove; 42. Bushing; 43. Rotating shaft; 44. Yarn swing rod; 45. Torsion spring; 46. Radial magnet; 47. Chip; 48. Positioning scale; 50. Control module; 60. Yarn-blocking disc. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0021] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0022] The core of this invention lies in providing a conveyor based on stable elastic yarn tension. By constructing a collaborative system encompassing pre-tensioning, real-time detection, and closed-loop feedback control, it effectively solves the technical problem of large tension fluctuations in elastic yarn during conveying. The following will elaborate on the various components of this invention, their interconnections, working principles, and the resulting technical effects in a progressive manner.

[0023] The overall technical solution of this application is summarized as follows: See Figure 1 and Figure 2This utility model provides a conveyor based on the stabilization of elastic yarn tension. Its core concept is to establish a dynamic and intelligent tension stabilization system. The system uses a housing 10 as its structural foundation, housing all functional modules. The yarn conveying path follows a specific sequence: the yarn first enters the tensioner 30 located at the inlet end of the housing 10 for preliminary, adjustable pre-tensioning to eliminate large tension fluctuations from the yarn source; subsequently, the yarn is guided to the yarn feeding assembly 20, which actively and precisely conveys it; after passing through the yarn feeding assembly 20, the yarn enters the tension detection module 40 located at the outlet end of the housing 10. This module detects the actual tension value of the output yarn in real time with high precision; finally, the control module 50 receives the tension signal from the tension detection module 40, compares it with a preset target tension value, and adjusts the driving speed of the yarn feeding assembly 20 in real time and precisely according to the deviation, thus forming a closed-loop control system to ensure that the final output yarn tension is maintained within an extremely stable range. Example 1

[0024] This embodiment will describe in detail the technical solutions and effects of the yarn feeding assembly 20 and the tensioner 30, as follows: See Figure 2 As the power source for yarn delivery, the stability and controllability of the yarn feeding assembly 20 are fundamental to the entire system. The yarn feeding assembly 20 includes a motor 21 fixedly installed inside the housing 10. This motor 21 is preferably a servo motor or a stepper motor, due to its good speed regulation characteristics and control precision. A yarn feeding wheel 22 is directly mounted on the output shaft of the motor 21. The yarn is wound around the yarn feeding wheel 22 in a specific winding manner, such as multiple turns, and is actively pulled and conveyed by friction. To ensure that the yarn is evenly distributed on the yarn feeding wheel 22 and to avoid overlapping or slippage, a yarn separating rod 23 is also provided at the yarn inlet end of the housing 10, between the tensioner 30 and the yarn feeding wheel 22.

[0025] Specifically, the yarn separating rod 23 is a smooth, cylindrical rod. During yarn feeding, the yarn is wound in multiple turns around the yarn feeding wheel 22 and the yarn separating rod 23 to achieve yarn feeding. In actual operation, to prevent the yarn from falling off the yarn separating rod 23, the end of the yarn separating rod 23 can be set to a warped shape. In this device, the yarn separating rod 23 is fixed to the machine housing 10 by screws. The operator can adjust the tilt angle of the yarn separating rod 23 relative to the yarn feeding wheel 22 by tightening the screws, so that the yarn separating rod 23 tilts slightly towards the yarn feeding wheel 22 to achieve uniform yarn feeding during the yarn feeding process.

[0026] The technical advantages of this solution are as follows: By directly driving the yarn feeding wheel 22 with the motor 21, power transmission is direct, avoiding problems such as slippage and lag that may occur with traditional belt or gear drives, thus ensuring the initial stability and rapid response of the conveying speed. This lays a solid foundation for subsequent precise speed control.

[0027] The setting of the yarn separating rod 23 effectively prevents the yarn from gathering or tangling on the yarn feeding wheel 22 during high-speed conveying. The uniform yarn distribution ensures that the friction between the yarn and the yarn feeding wheel 22 is constant, avoiding local tension fluctuations caused by changes in the contact area, thus avoiding potential factors of unstable yarn tension from the source.

[0028] See Figure 2 and Figure 5 Furthermore, the tensioner 30, as the first line of defense of the system, is mainly responsible for the preliminary, manually set stabilization treatment of the input elastic yarn.

[0029] The tensioner 30 includes a mounting block 31 fixed to the inlet end of the housing 10 by screws or clips. The mounting block 31 has an inlet hole for the yarn to pass through. A first tensioning arm 32 and a second tensioning arm 33, which can swing relative to the mounting block 31, are hinged to the mounting block 31 via a pin. After passing through the inlet hole, the yarn passes around these two tensioning arms along a specific path. By changing the swing angle of the tensioning arms, the wrap angle and path length of the yarn are changed, thereby adjusting the tension.

[0030] The technical effects of this solution are as follows: To optimize the tensioning effect and achieve symmetrical and balanced tensioning of the yarn, a key improvement of this utility model lies in the linkage design of the tensioning arms. Specifically, a first toothed pair 32a is provided at the end of the first tensioning arm 32 near the hinge point, and a second toothed pair 33a, which meshes and drives the first toothed pair 32a, is provided at the end of the second tensioning arm 33 near the hinge point. This design enables the first tensioning arm 32 and the second tensioning arm 33 to swing synchronously in opposite directions.

[0031] When the yarn tension increases, pushing the first tensioning arm 32 to swing in one direction, the second tensioning arm 33 will simultaneously swing in the opposite direction through the gear pair. This symmetrical motion balances the torque generated by the yarn on the two tensioning arms, greatly reducing the swaying of the tensioner itself caused by inertia or vibration, providing a smoother and more consistent positive pressure, and thus outputting a more stable pretension force. Compared to a single swing arm or independent swing arm design, this structure significantly improves the quality of pretensioning.

[0032] Both the mounting block 31 and the first tensioning arm 32 are equipped with yarn guide loops 35 to ensure accurate yarn path. A preload pin 34 is threaded onto the side of the mounting block 31. By rotating the preload pin 34, its end can be moved forward or backward, thereby tightening or loosening the root of the first tensioning arm 32 and / or the second tensioning arm 33. After adjusting to the required tensioning arm angle, i.e., the required preload force, tightening the preload pin 34 locks its position, preventing the set value from drifting due to vibration or other reasons during operation. This mechanical locking structure is simple, reliable, low-cost, and intuitive to adjust.

[0033] As a further preferred embodiment of this invention, a yarn-blocking disc 60 is also fixedly provided on the side of the tensioner 30 near the inlet hole. The yarn-blocking disc 60 is typically a disc with a central hole, which restricts the threaded yarn within a set working area, effectively preventing the yarn from accidentally falling off the inlet hole or tensioning arm during high-speed operation, thus avoiding yarn breakage or production interruption and improving the reliability of continuous operation of the equipment. Example 2

[0034] Based on Embodiment 1, this embodiment will describe in detail the technical solution and technical effects of the tension detection module 40, as follows: See Figure 3 and Figure 4 The tension detection module 40 includes a mounting housing 41 for protection and support. A bushing 42 is fixedly mounted inside the mounting housing 41, and a rotating shaft 43 is rotatably mounted inside the bushing 42 via a bearing or sliding bearing. A yarn lever 44 is fixedly connected to the peripheral wall of the rotating shaft 43, and the output yarn passes over this lever. A torsion spring 45 is provided between the rotating shaft 43 and the mounting housing 41, and the rotating shaft 43 is rotatably connected to the bushing 42 via a bearing. The torsion spring 45 provides a reset torque for the yarn lever 44. The torque of the torsion spring 45 is zero in its initial position. When the yarn tension changes, it overcomes the torque of the torsion spring 45, pushing the yarn lever 44 to rotate around the rotating shaft 43 by a certain angle. The greater the tension, the greater the rotation angle. To provide a clear mechanical zero point and prevent the lever from wobbling, a notch is provided in the side wall of the bushing 42. When the yarn lever 44 is initially in a zero-tension position, it is positioned in the middle of this notch and does not contact the side wall of the notch.

[0035] Furthermore, to accurately convert the mechanical rotation angle of the yarn swing arm 44 into an electrical signal, a radial magnet 46, i.e., a magnet with its magnetic poles pointing radially, is embedded at one end of the shaft 43. On the side wall of the mounting housing 41, opposite the radial magnet 46, an angle sensing chip 47 is positioned; this chip is preferably a Hall element. When a change in yarn tension causes the shaft 43 and the radial magnet 46 to rotate synchronously, the direction of the magnetic field on the magnet surface changes continuously relative to the Hall element. The Hall element can sensitively detect this change in magnetic field and output a proportional electrical signal, such as a voltage value.

[0036] The technical advantages of this solution are as follows: The non-contact detection method of both the radial magnet 46 and the angle sensing chip 47 completely avoids signal noise and lifespan issues caused by mechanical friction, wear, and contact resistance, resulting in extremely high accuracy, reliability, and lifespan. Simultaneously, the Hall element has a fast response speed, enabling it to capture instantaneous changes in tension.

[0037] Different elastic yarns require different ideal tension ranges, thus requiring the detection module to have different detection sensitivities, i.e., the amount of output signal change corresponding to a unit tension change.

[0038] Furthermore, the mounting housing 41 consists of a first housing 41a and a second housing 41b that are interlocked and fixed together, with the bushing 42 securely clamped between them. An annular positioning groove 41c is formed at one end of the second housing 41b. A positioning scale 48 is also rotatably mounted on the second housing 41b via a bearing. One end of the torsion spring 45 is fixed to the positioning scale 48. The positioning scale 48 has a protrusion similar to a ratchet structure that engages with the positioning groove 41c. During operation, the initial installation angle of the yarn swing arm 44 can be adjusted by rotating and locking the positioning scale 48 into engagement with the positioning groove 41c. After adjustment, the protrusion engages with the positioning groove 41c, locking the positioning scale 48 and preventing loosening.

[0039] In this design, by adjusting the position of the positioning scale 48, the initial installation position of the yarn swing arm 44 is substantially changed. This change in the initial position of the yarn swing arm 44 adjusts its detection range during tension detection. This allows the same equipment to adapt to various process requirements from low to high tension with simple adjustments, broadening its application range and making the device suitable for yarns of different materials and with different elongation properties. Example 3

[0040] Based on the two embodiments described above, this embodiment will detail the system closed-loop control logic of the control module 50, as follows: The control module 50 is the brain of this device, responsible for processing information and issuing control commands. The control module 50 is typically a circuit board with a microprocessor (MCU) at its core, mounted on the housing 10, and electrically connected to the angle sensing chip 47 of the tension detection module 40 and the motor 21 of the yarn feeding assembly 20. It internally stores preset target tension values.

[0041] The control module 50 continuously reads the voltage signal sent by the angle sensing chip 47, representing the real-time tension F1. Then, it compares F1 with the preset target tension value F0 and calculates the tension deviation E = F0 - F1. Next, based on the magnitude and direction of the deviation E, it uses PID control to generate a control signal, such as a PWM pulse signal, and sends it to the driver of the drive motor 21.

[0042] 1. When F1 < F0, the tension is too low: Control module 50 will determine that the tension needs to be increased. At this time, control module 50 issues a command to reduce the speed of motor 21. Since the speed of the yarn feed roller 22 is reduced, while the traction speed of downstream weaving equipment such as knitting needles remains basically unchanged, the yarn will be tightened, thereby increasing the tension F1 until it approaches F0.

[0043] 2. When F1 > F0, indicating excessive tension: Control module 50 determines that the tension needs to be reduced. At this time, control module 50 issues a command to increase the speed of motor 21. As the speed of yarn feeding roller 22 increases, it more actively feeds the yarn, relieving the tension of the yarn, thereby reducing tension F1 until it approaches F0.

[0044] 3. Dynamic Adjustment Process: The "detection-comparison-adjustment" process of the control module 50 is continuous and high-speed, with a response time in the millisecond range. Therefore, when this equipment is in use, any factor that causes tension fluctuations, such as uneven yarn supply, slight wear on the surface of the yarn feeding wheel, or slight speed fluctuations in downstream equipment, will be detected and corrected by the control module 50.

[0045] This invention achieves active, real-time, and adaptive control of elastic yarn tension through the aforementioned closed-loop control logic. It upgrades traditional passive and static tension control to active, dynamic, and intelligent control. The ultimate effect is that the tension of the elastic yarn output from the conveyor is firmly stabilized within a preset, minimal fluctuation range, generally controlled within ±0.2CN (the tension fluctuation range can be adaptively adjusted according to different specifications and materials of the yarn). This ensures that the finished fabric has a uniform texture, no color difference, no defects, and consistent physical properties, improving the quality of finished textile products and reducing the defect rate.

[0046] The workflow of this utility model is as follows: 1. Threading and Initial Setup: The operator draws the elastic yarn from the yarn bobbin, passes it sequentially through the yarn guide plate 60 of the tensioner 30, the yarn inlet hole, the yarn loop 35, and around the first and second tensioning arms 32 and 33. The yarn is then guided around the yarn separating rod 23, wound several times on the feed roller 22, and finally passes over the yarn swing rod 44 of the tension detection module 40 before being output to downstream textile equipment. According to the yarn specifications and process requirements, the preload of the tensioner 30 is adjusted via the preload pin 34, and the detection sensitivity of the tension detection module 40 is set by rotating the positioning scale 48. The target tension value F0 is set on the control module 50.

[0047] 2. Start-up and operation: Start the equipment. The downstream textile equipment begins to pull the yarn, and the motor 21 of the yarn conveying assembly 20 starts to convey the yarn at the same time.

[0048] 3. Dynamic Stabilization Process: The system enters automatic operation mode. The tension detection module 40 monitors the tension of the output yarn in real time and transmits the signal to the control module 50. The control module 50 continuously and finely adjusts the speed of the motor 21 based on the deviation between the real-time tension and the target tension to ensure constant output tension.

[0049] 4. Abnormal Handling: In case of extreme situations such as yarn breakage, the yarn swing arm 44 will quickly rebound to the initial position at the notch under the action of the torsion spring 45. If the control module 50 detects a sharp change or disappearance of the tension signal, it can immediately trigger a stop alarm to play a safety protection role.

[0050] It should be noted that, in this embodiment, the angle sensing chip 47 can be any type of magnetic sensor other than a Hall element, such as an anisotropic magnetoresistive (AMR) sensor or a giant magnetoresistive (GMR) sensor. The control algorithm of the control module 50 can employ fuzzy control, adaptive control, or other control algorithms besides the PID algorithm. The specific structure of the tensioner 30 can take other forms, such as a spring-loaded roller tensioning mechanism, but its core function remains to provide the system with preliminary, adjustable pre-tensioning.

[0051] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A conveyor based on the stable tension of elastic yarn, comprising a housing (10), wherein a yarn feeding assembly (20) for conveying yarn is disposed on the housing (10), characterized in that, The conveyor also includes: Tensioner (30), the tensioner (30) is provided at the inlet end of the housing (10) for pre-tensioning the elastic yarn input to the yarn feeding assembly (20); Tension detection module (40), the tension detection module (40) is set at the outlet end of the housing (10) and is used to detect the tension of the elastic yarn after being conveyed by the yarn feeding assembly (20); The control module (50) is disposed on the housing (10) and electrically connected to the tension detection module (40) and the yarn feeding assembly (20). It is used to receive the tension signal from the tension detection module (40) and adjust the rotation speed of the yarn feeding assembly (20) according to the signal.

2. The conveyor according to claim 1, characterized in that, The tension detection module (40) includes a mounting shell (41), a bushing (42) is fixedly installed inside the mounting shell (41), a rotating shaft (43) is rotatably installed inside the bushing (42), and a yarn swing rod (44) for yarn to pass around is fixedly connected to the peripheral wall of the rotating shaft (43). A torsion spring (45) providing a reset torque is provided between the rotating shaft (43) and the mounting housing (41). The bushing (42) has a notch in its side wall, and the initial position of the yarn swing rod (44) abuts against one side wall of the notch.

3. The conveyor according to claim 2, characterized in that, A radial magnet (46) is embedded at one end of the rotating shaft (43), and an angle sensing chip (47) is provided on the side wall of the mounting shell (41) corresponding to the radial magnet (46). When the radial magnet (46) rotates with the rotating shaft (43), the change in its magnetic field is detected by the angle sensing chip (47).

4. The conveyor according to claim 3, characterized in that, The angle sensing chip (47) is a Hall element.

5. The conveyor according to claim 2, characterized in that, The mounting shell (41) is composed of a first shell (41a) and a second shell (41b) that are fastened together, and the bushing (42) is clamped and fixed between the first shell (41a) and the second shell (41b); One end of the second housing (41b) is formed with an annular positioning groove (41c), and a positioning scale (48) is also rotatably provided on the second housing (41b) via a bearing. One end of the torsion spring (45) is fixed to the positioning scale (48), which has a protrusion that engages with the positioning groove (41c). The initial installation angle of the yarn swing rod (44) is adjusted by rotating and locking the positioning scale (48).

6. The conveyor according to claim 1, characterized in that, The tensioner (30) includes a mounting block (31) fixed on the housing (10). The mounting block (31) has a wire inlet hole. The mounting block (31) is also hinged with a first tensioning arm (32) and a second tensioning arm (33) that can swing relative to each other by means of a pin.

7. The conveyor according to claim 6, characterized in that, The first tensioning arm (32) has a first tooth pair (32a) at one end near the hinge point, and the second tensioning arm (33) has a second tooth pair (33a) at one end near the hinge point that meshes with the first tooth pair (32a) for transmission, so that the first tensioning arm (32) and the second tensioning arm (33) swing in opposite directions.

8. The conveyor according to claim 6, characterized in that, Both the mounting block (31) and the first tensioning arm (32) are provided with thread loops (35) for guiding the yarn. The mounting block (31) has a preload pin (34) threaded on its side. Rotating the preload pin (34) will cause its end to abut against the first tension arm (32) and / or the second tension arm (33) to fix its swing angle.

9. The conveyor according to claim 6, characterized in that, The tensioner (30) also includes a yarn baffle (60) fixed to the mounting block (31) near the inlet hole to prevent the yarn from coming off.

10. The conveyor according to claim 1, characterized in that, The yarn feeding assembly (20) includes a motor (21) fixed inside the housing (10), a yarn feeding wheel (22) is mounted on the output shaft of the motor (21), and a yarn separating rod (23) is also provided at the inlet end of the housing (10).

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