Tension yarn release device

Abstract

The utility model relates to the field of fiber reinforced composite material manufacturing discloses a kind of tension yarn releasing device, and tension yarn releasing device includes unwinding rotary shaft, detection rotary lever and friction belt;Unwinding rotary shaft includes unwinding section and friction section;The rotating shaft of detection rotary lever is fixed with the position of unwinding rotary shaft, but not coincident, detection rotary lever is set to make the detection end of detection rotary lever always resist the outer periphery of spool in the yarn releasing process of spool under first acting force;Friction belt is arranged around part friction section, one end of friction belt is fixed with the axial position of friction section, but not coincident, other end is connected to detection rotary lever by first elastic member, to make friction belt and friction section adhere under the elastic tension of first elastic member;In the yarn releasing process, the elastic tension of first elastic member decreases with the decrease of the diameter of spool detected by detection end, and the sliding friction between friction belt and friction section decreases with the decrease of the elastic tension of first elastic member.The device yarn releasing speed is stable, and tension control precision is high.

Description

Technical Field

[0001] This utility model relates to the field of fiber-reinforced composite material manufacturing technology, and specifically to a tension feeding device. Background Technology

[0002] In the field of fiber-reinforced composite material manufacturing technology, fiber filaments, such as glass fiber filaments, aramid filaments, polyester filaments, or fiber bundles produced through processes such as pre-impregnation and twisting, are typically used to produce reinforcing tapes. In these processes, pneumatic tension unwinding devices are usually used to unwind the filaments.

[0003] In existing technologies, pneumatic tension unwinding devices are fixedly mounted on a spindle frame. A drive cylinder outputs compressed gas from the pneumatic chamber, thereby driving the unwinding shaft to rotate with a nearly constant driving force. However, because the diameter of the spindle decreases continuously as the filament is unwound during the unwinding process, driving the unwinding shaft with a constant driving force causes the linear velocity of the filament to gradually decrease as unwinding progresses. This results in unstable unwinding speeds in existing tension unwinding devices, which are difficult to precisely adjust and control, failing to meet high-precision production requirements. Furthermore, pneumatic tension unwinding devices cannot be applied to rotating bodies, such as in the manufacture of RTP tubes where unwound fibers are wound onto a plastic core tube as a reinforcing layer. Utility Model Content

[0004] The purpose of this invention is to overcome the problems of large fluctuations in the feeding tension, difficulty in accurately controlling the feeding speed, and inability to be installed and used on rotating bodies in existing tension feeding devices. This invention provides a mechanical constant tension feeding device that features stable feeding speed, high precision in feeding tension control, and constant tension self-adaptation. It can be used on fixed frames or rotating bodies.

[0005] To achieve the above objectives, this utility model provides a tension feeding device, which includes: An unwinding shaft, the unwinding shaft including an unwinding section and a friction section for mounting a wire spindle in its axial direction; A detection rotating rod, wherein the rotation axis of the detection rotating rod is relatively fixed but not coincident with the position of the unwinding rotating shaft, and the detection rotating rod is configured such that, under the action of a first force, the detection end of the detection rotating rod always abuts against the outer periphery of the yarn spindle during the unwinding process; and A friction strip is provided around a portion of the friction segment. One end of the friction strip is fixed relative to but does not coincide with the axis of the friction segment, and the other end is connected to the detection rotating rod through a first elastic element, so that the friction strip and the friction segment are tightly attached under the elastic tension of the first elastic element. During the wire feeding process, the elastic tension of the first elastic element decreases as the diameter of the wire spindle detected by the detection end decreases, and the sliding friction between the friction band and the friction section decreases as the elastic tension of the first elastic element decreases.

[0006] In some embodiments, the detection lever includes: Connect the rotating shaft; A detection rod, the detection rod being connected to the connecting shaft, and the detection end being located at the end of the detection rod opposite to the connecting shaft; and An extension plate is connected to the outer periphery of the connecting shaft. One end of the first elastic member is connected to the first connecting portion of the extension plate. The first connecting portion and the detection rod are located on the same side of a first plane, which is the plane containing the axis of the unwinding shaft and the axis of the connecting shaft.

[0007] In some embodiments, the tension unwinding device further includes a mounting plate, wherein the unwinding shaft and the connecting shaft are rotatably connected to one side surface of the mounting plate, and the side surface of the mounting plate is perpendicular to the axial direction of the unwinding shaft. In some embodiments, one end of the friction strip is connected to the mounting plate; In some embodiments, the friction section is disposed between the unwinding section and the mounting plate.

[0008] In some embodiments, the expansion plate further includes a second connecting portion, which is located on the opposite side of the first connecting portion from the first plane; The tension feeding device further includes a second elastic element, one end of which is connected to the second connecting part, and the other end is connected to the mounting plate through a second connecting member. The elastic tension of the second elastic element provides the first force for the detection end to abut against the outer periphery of the yarn spindle.

[0009] In some embodiments, the second connector is configured to adjust the elastic tension of the second elastic element; In some embodiments, the friction band is connected to the mounting plate via a first connector, the first connector being configured to adjust the elastic tension of the first elastic element.

[0010] In some embodiments, the first elastic element is a tension spring, and the stretching direction of the first elastic element is parallel to the mounting plate; In some embodiments, the second elastic element is a tension spring, and the stretching direction of the second elastic element is parallel to the mounting plate.

[0011] In some embodiments, the first connector and / or the second connector includes: A mounting post, one end of which is connected to the mounting plate, and the other end of which has a radially penetrating adjustment hole; and An adjusting rod, one end of which is connected to the spring foot of the tension spring or the end of the friction band, and the other end is connected to an adjusting nut; The adjusting nut is disposed in the adjusting hole and is configured to be driven to rotate, thereby rotating the adjusting rod to adjust the elastic tension of the first elastic element or the second elastic element.

[0012] In some embodiments, the arc length S of the portion of the friction segment that contacts the friction band satisfies the following condition: S / C≥0.25.

[0013] In some embodiments, the detection end is provided with a roller, and the detection rotor is configured to cause the roller to roll and rub against the rotating spindle during the feeding process of the spindle.

[0014] In some embodiments, the tension unwinding device further includes: A quick stop is provided at the end of the unwinding section away from the friction section and is configured to abut the end of the spindle to limit the relative position of the spindle and the unwinding section in the axial direction. In some embodiments, the tension unwinding device further includes: An anti-rotation pin is provided on the outer periphery of the unwinding section near the friction section and is configured to be inserted into the spindle core notch of the spindle to limit the relative position of the spindle and the unwinding section in the circumferential direction.

[0015] Through the above technical solution, the tension unwinding device provided by this utility model, during the unwinding process, has its detection end of the detection rod abutting against the outer circumferential side of the spindle in real time under the action of the first force, thereby realizing real-time detection of the spindle diameter; the friction belt and the friction section undergo sliding friction, so that the unwinding tension of the tension unwinding device can be controlled by the friction force between the friction belt and the friction section. During the unwinding process of the spindle, as the diameter of the spindle gradually decreases as the filament wound on the spindle is gradually released, the detection rod rotates with the change of the spindle diameter under the action of the first force, so that the detection end always abuts against the outer circumferential side of the spindle, and the distance between the detection end abutting against the outer circumferential side of the spindle and the unwinding section decreases as the diameter of the spindle decreases; while the elastic tension of the first elastic element connected to the detection rod decreases as the detection end detects the decrease in the diameter of the spindle.

[0016] Because the friction belt and friction segment in this invention are tightly attached under the elastic tension of the first elastic element, the greater the elastic tension of the first elastic element, the greater the pressure between the friction belt and friction segment. According to the principle of sliding friction, the greater the pressure between the friction belt and friction segment, the greater the sliding friction between them. The tension unwinding device provided by this invention rotates its unwinding shaft under the combined rotational force of a constant external driving force and the frictional force of the friction belt. As the diameter of the yarn spindle gradually decreases, the frictional force of the friction belt gradually decreases, while the rotational force gradually increases.

[0017] In this invention, the friction force of the friction belt compensates for the rotational force of the unwinding shaft, avoiding the situation in related technologies where the unwinding shaft is driven to rotate by a constant driving force, which leads to a decrease in the unwinding linear speed due to the reduction in the diameter of the filament spindle during the unwinding process. This causes the angular velocity of the unwinding shaft to gradually increase as the diameter of the filament spindle decreases, allowing the filament of the filament spindle to be unwound at a constant speed and with stable tension. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a tension feeding device provided by this utility model; Figure 2 yes Figure 1 The diagram shows a front view of the tension feeding device equipped with a spindle; Figure 3 yes Figure 2 The diagram shows a cross-sectional view of the tension feeding device along line AA.

[0019] Explanation of reference numerals in the attached figures 1-Tension unwinding device; 10-Unwinding shaft; 11-Unwinding section; 12-Friction section; 20-Detection rod; 21-Connecting shaft; 22-Detection rod; 23-Roller; 30-Extension plate; 31-First connecting part; 32-Second connecting part; 40-Friction belt; 50-Spindle; 51-Spindle material; 52-Spindle core notch; 60-First elastic element; 61-Second elastic element; 70-Mounting plate; 80-First connecting piece; 81-Second connecting piece; 90-Fast stop; 91-Anti-rotation pin; 801-Mounting column; 802-Adjusting rod; 803-Adjusting nut. Detailed Implementation

[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0021] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," and "rear," etc., indicating orientation or positional relationships, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] Furthermore, the terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0023] Understandably, in the field of fiber-reinforced composite material manufacturing technology, in order to ensure that the filament can be stably, smoothly, and evenly released from the spool to manufacture reinforcing strips or wound onto tubes as a reinforcing layer, the filament should be released with as much stable tension and constant linear speed as possible during the unwinding process. Current unwinding devices typically use a drive component to unwind the filament using a driving force. This driving force can act on the filament, causing the unwinding shaft to rotate, or it can act directly on the unwinding shaft to cause it to rotate.

[0024] The aforementioned driving force is typically provided by a cylinder, which makes the linear velocity of the unwound filament unstable and the tension difficult to control during the unwound process. Using a constant driving force to drive the unwound will cause the angular velocity of the unwinding shaft to gradually increase (the mass of the spool gradually decreases as the filament is unwound, and the angular velocity of the unwinding shaft gradually increases as the spool mass decreases), and the radius of the spool will also gradually decrease as the filament is unwound. Since the unwound filament needs to be wound around the unwinding shaft, the driving force needs to drive the unwinding shaft to rotate in addition to driving the spool rotation, and also overcome the friction of the unwinding shaft. Therefore, when using a constant driving force to drive the unwound, the rate of change of the angular velocity of the unwinding shaft is less than the rate of change of the spool radius. This causes the linear velocity of the filament to gradually decrease as the process continues, and it is difficult to achieve precise control of the linear velocity of the unwound filament by controlling the driving force.

[0025] To address the aforementioned technical problems, this utility model provides a tension unloading device 1. Please refer to [link / reference]. Figure 1 and Figure 2 , Figure 1This is a three-dimensional structural diagram of a tension unloading device provided by this utility model. Figure 2 yes Figure 1 The diagram shows a front view of the tension unwinding device equipped with a yarn bobbin. The tension unwinding device 1 provided by this utility model includes an unwinding shaft 10, a detection rotating rod 20, and a friction belt 40. The unwinding shaft 10 includes an unwinding section 11 and a friction section 12 for mounting the spindle 50 in its axial direction. The rotation axis of the detection rod 20 is fixed relative to but does not coincide with the position of the unwinding shaft 10. The detection rod 20 is configured such that, under the action of a first force, the detection end of the detection rod 20 always abuts against the outer periphery of the spindle 50 during the unwinding process. The friction band 40 is arranged around a portion of the friction section 12. One end of the friction band 40 is fixed relative to but does not coincide with the axial center of the friction section 12, and the other end is connected to the detection rod 20 through a first elastic element 60, so that the friction band 40 and the friction section 12 are tightly attached under the elastic tension of the first elastic element 60. During the unwinding process, the elastic tension of the first elastic element 60 decreases as the diameter of the spindle 50 detected by the detection end decreases, and the sliding friction between the friction band 40 and the friction section 12 decreases as the elastic tension of the first elastic element 60 decreases.

[0026] The terms "up," "down," "left," and "right" as used below refer to... Figure 2 The "up, down, left, right" in Chinese Figure 2 The angle shown is "front". The orientation or positional relationship is only for the convenience of describing this disclosure and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0027] exist Figure 1 and Figure 2 In one specific embodiment, the unwinding shaft 10 and the detection rod 20 are rotatably mounted on one side of the mounting plate 70. The unwinding section 11 of the unwinding shaft 10 is located on the front side away from the mounting plate 70, and the friction section 12 is located between the mounting plate 70 and the unwinding section 11. The rotation shaft of the detection rod 20 is mounted directly below the unwinding shaft 10, and the detection end of the detection rod 20 abuts against the lower right side of the spindle 50 mounted on the unwinding section 11 under the action of a first force. It is understood that in some other embodiments, the tension unwinding device 1 may not include the mounting plate 70, and the unwinding shaft 10 and the detection rod 20 may be mounted on a mounting bracket. In some embodiments, the detection rod 20 can detect the diameter of the spindle 50 in real time, thereby achieving real-time monitoring of the unwinding process.

[0028] exist Figure 1 and Figure 2In a specific embodiment, the friction band 40 is arranged around the upper half of the friction band 40. The friction band 40 and the friction segment 12 are in close contact with each other. The right end of the friction band 40 is connected to the detection rotating rod 20 on the lower right side of the friction segment 12 through the first elastic member 60, and the left end is connected to the mounting plate 70 on the lower left side of the friction segment 12. The first elastic member 60 is in an elastically stretched state. The friction band 40 and the friction segment 12 resist each other with a certain pressure under the elastic tension of the first elastic member 60. It can be understood that the contact area and contact position of the friction band 40 and the friction segment 12 in this utility model are not limited to the embodiment shown in the figure. As long as the friction band 40 and the friction segment 12 are tightly attached under the elastic tension of the first elastic member 60, and the elastic tension of the first elastic member 60 can decrease as the diameter of the spindle 50 detected by the detection end decreases, it is acceptable.

[0029] It is understood that the first force in this invention is provided by the detection end pressing against the outer periphery of the spindle 50, thereby making the elastic tension of the first elastic element 60 only related to the diameter of the spindle 50. Figure 1 and Figure 2 In a specific embodiment, during the unwinding process of the filament 51 on the spindle 50, the movement of the filament 51 causes the unwinding shaft 10 to rotate counterclockwise. As the diameter of the spindle 50 gradually decreases, the detection end gradually approaches the axis of the unwinding section 11, and the detection rod 20 also slowly rotates counterclockwise. The rotation of the detection rod 20 causes the first elastic element 60 to move towards the friction section 12, and the stretching length of the first elastic element 60 in the stretched state decreases; the tension of the first elastic element 60 acting on the friction belt 40 also decreases accordingly, and the pressure between the friction belt 40 and the friction section 12 also decreases accordingly; according to the principle of sliding friction, the sliding friction force between the friction belt 40 and the friction section 12 also decreases accordingly.

[0030] Through the above technical solution, the friction belt 40 in this utility model is connected to the detection rotating rod 20 through the first elastic element 60, providing friction force to the unwinding shaft 10. This friction force gradually decreases as the yarn spindle 50 unwinds, so that the fiber yarn is released with constant tension at the same traction speed. This avoids the situation in related technologies where the unwinding shaft is driven to rotate by a constant driving force, and the unwinding tension continuously increases due to the decrease in the diameter of the yarn spindle during the unwinding process, which makes the device unable to meet the high-precision production requirements and may even lead to yarn breakage.

[0031] Please continue reading. Figure 1 and Figure 2In some embodiments, the detection rod 20 includes a connecting shaft 21, a detection rod 22, and an extension plate 30. The detection rod 22 is connected to the connecting shaft 21, and the detection end is located at the end of the detection rod 22 opposite to the connecting shaft 21. The extension plate 30 is connected to the outer periphery of the connecting shaft 21, and one end of the first elastic member 60 is connected to the first connecting portion 31 of the extension plate 30. The first connecting portion 31 and the detection rod 22 are located on the same side of a first plane, which is the plane containing the axis of the unwinding shaft 10 and the axis of the connecting shaft 21.

[0032] It is understood that in this embodiment, the connecting shaft 21 is the rotating shaft that connects the rotating rod. The detection rod 22 extends outward to detect the diameter of the wire spindle 50 and determine the rotation angle of the connecting shaft 21. The extension plate 30 connects the first elastic member 60 to the detection rotating rod 20.

[0033] in, Figure 1 and Figure 2 In the specific embodiment, the first plane can be understood as plane AA. In this embodiment, the extension plate 30 and the detection rod 22 are respectively connected to the side wall of the connecting shaft 21 perpendicular to the axial direction of the connecting shaft 21. Preferably, the extension plate 30 and the friction section 12 are disposed on the same plane, and the detection rod 22 is preferably disposed corresponding to the unwinding section 11. The first connecting part 31 of the detection rod 22 and the extension plate 30 is disposed on the same side of the first plane, so that when the detection rod 22 rotates toward the detection end and toward the unwinding shaft 10, the first connecting part 31 can also rotate toward the unwinding shaft 10, and the elastic tension of the first elastic member 60 connected to the first connecting part 31 can gradually decrease as the first connecting part 31 moves.

[0034] Please continue reading. Figure 1 and Figure 2 And please see Figure 3 , Figure 3 yes Figure 2 The diagram shows a cross-sectional view of the tension unwinding device along line AA. In some embodiments, the tension unwinding device 1 further includes a mounting plate 70, the unwinding shaft 10 and the connecting shaft 21 are rotatably connected to one side of the mounting plate 70, and this side of the mounting plate 70 is perpendicular to the axial direction of the unwinding shaft 10.

[0035] In this embodiment, the mounting plate 70 mounts the unwinding shaft 10 and the detection rod 20. In some embodiments, one end of the friction belt 40 is connected to the mounting plate 70, thereby fixing the position of the fixed end of the friction belt 40 relative to the axis of the friction section 12. In some embodiments, the friction section 12 is positioned between the unwinding section 11 and the mounting plate 70, making it easier to replace the spindle 50 in the tension unwinding device 1 provided in this embodiment.

[0036] Please continue reading. Figures 1 to 3 In some embodiments, the extension plate 30 further includes a second connecting portion 32, which is located on the opposite side of the first connecting portion 31 on the first plane; the tension feeding device 1 further includes a second elastic element 61, one end of which is connected to the second connecting portion 32, and the other end is connected to the mounting plate 70 via a second connecting member 81. The distance between the second connecting portion 32 and the friction section 12 is smaller than the distance between the second connecting member 81 and the friction section 12. The elastic tension of the second elastic element 61 provides the first force for the detection end to abut against the outer periphery of the spindle 50.

[0037] In some specific implementation methods, refer to Figure 1-3 The extension plate 30 is a rhombus-shaped plate, with its geometric center located on the axis of the connecting shaft 21. The first connecting part 31 and the second connecting part 32 are located at two opposite corners of the rhombus plate and are centrally symmetrical with respect to its geometric center. The lower end of the first elastic member 60 is connected to the first connecting part 31, and the upper end is connected to the friction band 40 above. The upper end of the second elastic member 61 is connected to the second connecting part 32, and the lower end is stretched downward and elastically connected to the mounting plate 70.

[0038] It should be noted that the elastic tension of the second elastic element 61 acting on the detection shaft in this embodiment needs to be large enough so that the detection end of the detection shaft can abut against the outer periphery of the spindle 50 under the action of the elastic tension of the second elastic element 61. The first elastic element 60 does not need to provide elastic tension for the detection end to abut against the spindle 50. It only needs to shorten accordingly according to the angle change of the detection rod 20 when the detection end abuts against the spindle 50, and gradually reduce the force acting on the detection rod 20 as the length shortens.

[0039] It should be noted again that the second elastic element 61 can be one of the existing materials such as tension spring, compression spring, leaf spring, torsion spring, elastic rubber, etc. Depending on the material, its position may be different, but its function is to provide the first force to make the detection end of the detection rod 20 fit tightly against the outer circumference of the spindle 50.

[0040] Please continue reading. Figures 1 to 3In some embodiments, the second connector 81 is configured to adjust the elastic tension of the second elastic member 61; in some embodiments, the friction band 40 is connected to the mounting plate 70 via a first connector 80, the first connector 80 being configured to adjust the elastic tension of the first elastic member 60. It is understood that in this embodiment, the first connector 80 and the second connector 81 can respectively adjust the elastic tension of the first elastic member 60 and the second elastic member 61.

[0041] In some embodiments, the first connector 80 and the second connector 81 are respectively configured to adjust the relative positions between the ends of the first elastic element 60 and the second elastic element 61 and the mounting plate 70, thereby adjusting the elastic tension of the first elastic element 60 and the second elastic element 61; in some embodiments, the first connector 80 and the second connector 81 are respectively configured to adjust the torsion angle of the first elastic element 60 and the second elastic element 61, thereby adjusting the elastic tension of the first elastic element 60 and the second elastic element 61.

[0042] Please continue reading. Figures 1 to 3 In some embodiments, the first elastic element 60 is a tension spring, and the stretching direction of the first elastic element 60 is parallel to the mounting plate 70; in some embodiments, the second elastic element 61 is a tension spring, and the stretching direction of the second elastic element 61 is parallel to the mounting plate 70.

[0043] In some embodiments, the first connecting portion 31 and the second connecting portion 32 are respectively two through holes provided on the expansion plate 30, and the spring legs of the tension spring pass through the through holes to connect the first elastic element 60 and the second elastic element 61 to the expansion plate 30. It can be understood that the stretching direction of the first elastic element 60 is parallel to the mounting plate 70, and the stretching direction of the second elastic element 61 is parallel to the mounting plate 70, so that the tension unloading device 1 is subjected to stable force.

[0044] Please continue reading. Figures 1 to 3 In some embodiments, the first connector 80 and / or the second connector 81 include a mounting post 801 and an adjusting rod 802; one end of the mounting post 801 is connected to the mounting plate 70, and the other end is provided with an adjusting hole extending radially through; one end of the adjusting rod 802 is connected to the spring foot of the tension spring or the end of the friction band 40, and the other end is connected to an adjusting nut 803. The adjusting nut 803 is partially disposed in the adjusting hole and is configured to be driven to rotate, thereby rotating the adjusting rod 802 to adjust the elastic tension of the first elastic member 60 or the second elastic member 61.

[0045] It is understood that in this embodiment, the mounting post 801 connects the mounting plate 70 and the tension spring, while the adjusting rod 802 and the adjusting nut 803 adjust the tension of the tension spring. Preferably, the position of the adjusting hole on the mounting post 801 is on the same plane as the position of the extension plate 30, so that the tension spring can be stretched in a direction parallel to the mounting plate 70, thus stabilizing the force on the tension unloading device 1. In use, the tension unloading device 1 of this embodiment can be pre-rotated with the adjusting nut 803, causing the tension spring to twist as the adjusting rod 802 rotates, thereby adjusting the tension spring to a suitable tension.

[0046] In some embodiments, the arc length S of the portion of the friction segment 12 that contacts the friction band 40 satisfies the following condition with respect to the circumference C of the friction circumference surface of the friction segment 12: S / C≥0.25.

[0047] Understandably, a small contact area between the friction belt 40 and the friction section 12 leads to insufficient friction between them. During the unwinding process, changes in the diameter of the spindle 50 are difficult to be reflected back to the frictional force between the friction belt 40 and the friction section 12 through changes in the tension of the first elastic element 60. This results in the friction belt 40 failing to effectively compensate for the rotational force of the unwinding shaft 10. In this embodiment, the arc length S of the portion of the friction section 12 that contacts the friction belt 40 satisfies the condition that S / C ≥ 0.25 with respect to the circumference C of the friction surface of the friction section 12. This allows the friction belt 40 to sensitively compensate for the rotational force of the unwinding shaft 10.

[0048] Please continue reading. Figures 1 to 3 In some embodiments, the detection end is provided with a roller 23, and the detection rotating rod 20 is configured to cause the roller 23 to roll and rub against the rotating spindle 50 during the yarn feeding process. It can be understood that in this embodiment, the roller 23 rolls as the yarn 51 is fed out during the yarn feeding process, thereby effectively reducing the damage to the yarn 51 caused by the detection end scraping it.

[0049] Please continue reading. Figure 2 In some embodiments, during the unwinding process, the roller 23 of the detection rod 20 rotates in the opposite direction to the unwinding shaft 10; thereby minimizing the influence of the detection rod 20 on the rotation of the spindle 50 during the unwinding process, reducing the scraping of the detection end on the filament 51, ensuring that the filament 51 can be unwound smoothly, and minimizing the damage to the filament 51.

[0050] Please continue reading. Figures 1 to 3In some embodiments, the tension unwinding device 1 further includes a quick stop 90, which is disposed at the end of the unwinding section 11 away from the friction section 12 and is configured to abut the end of the spindle 50 to limit the relative position of the spindle 50 and the unwinding section 11 in the axial direction.

[0051] In this embodiment, when installing the spindle 50, the tension unwinding device 1 can first slip the spindle 50 from the front end of the unwinding shaft 10 onto the unwinding section 11, and then have the stop portion of the quick stop 90 abut against the front end of the spindle 50, thereby restricting the relative position of the spindle 50 and the unwinding section 11 in the axial direction. It is understood that in some other embodiments, the tension unwinding device 1 can also use other stop components and stop structures to fix the axial position of the spindle 50.

[0052] Please continue reading. Figures 1 to 3 In some embodiments, the tension unwinding device 1 further includes an anti-rotation pin 91, which is disposed on the outer peripheral side of the unwinding section 11 near the friction section 12 and configured to insert into the spindle core notch 52 of the spindle 50 to limit the relative position of the spindle 50 and the unwinding section 11 in the circumferential direction. (Reference) Figure 3 In the tension unwinding device 1 provided in this embodiment, after the spindle 50 and the unwinding section 11 are installed, the anti-rotation pin 91 extends into the spindle core notch 52 of the spindle 50, thereby preventing the spindle 50 from slipping relative to the unwinding section 11 during the unwinding process.

[0053] Those skilled in the art should understand that the above embodiments or implementation methods are for illustrative purposes only and are not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or implementation methods or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the different embodiments or implementation methods can be combined in any way.

Claims

1. A tension unloading device, characterized in that, The tension unwinding device (1) includes: The unwinding shaft (10) includes an unwinding section (11) and a friction section (12) for mounting the spindle (50) in its axial direction. A detection rotating rod (20) is provided, wherein the rotation axis of the detection rotating rod (20) is fixed relative to but does not coincide with the position of the unwinding rotating shaft (10). The detection rotating rod (20) is configured such that, under the action of a first force, the detection end of the detection rotating rod (20) always abuts against the outer periphery of the spindle (50) during the unwinding process of the spindle (50); and A friction band (40) is provided around a portion of the friction segment (12). One end of the friction band (40) is fixed relative to but does not coincide with the axial position of the friction segment (12). The other end is connected to the detection rotating rod (20) through a first elastic element (60) so that the friction band (40) and the friction segment (12) are tightly attached under the elastic tension of the first elastic element (60). During the wire feeding process, the elastic tension of the first elastic element (60) decreases as the diameter of the wire spindle (50) detected by the detection end decreases, and the sliding friction between the friction band (40) and the friction section (12) decreases as the elastic tension of the first elastic element (60) decreases.

2. The tension unwinding device according to claim 1, characterized in that, The detection rotating rod (20) includes: Connect the rotating shaft (21); The detection rod (22) is connected to the connecting shaft (21), and the detection end is located at the end of the detection rod (22) opposite to the connecting shaft (21); and An extension plate (30) is connected to the outer periphery of the connecting shaft (21). One end of the first elastic element (60) is connected to the first connecting part (31) of the extension plate (30). The first connecting part (31) and the detection rod (22) are located on the same side of a first plane. The first plane is the plane containing the axis of the unwinding shaft (10) and the axis of the connecting shaft (21).

3. The tension unwinding device according to claim 2, characterized in that, The tension unwinding device (1) further includes a mounting plate (70), the unwinding shaft (10) and the connecting shaft (21) are rotatably connected to one side of the mounting plate (70), and the side of the mounting plate (70) is perpendicular to the axial direction of the unwinding shaft (10), wherein: One end of the friction strip (40) is connected to the mounting plate (70); and / or The friction section (12) is disposed between the unwinding section (11) and the mounting plate (70).

4. The tension unwinding device according to claim 3, characterized in that, The expansion plate (30) further includes a second connecting part (32), which is located on the opposite side of the first connecting part (31); The tension feeding device (1) further includes a second elastic element (61), one end of which is connected to the second connecting part (32) and the other end is connected to the mounting plate (70) through the second connecting part (81). The elastic tension of the second elastic element (61) provides the first force for the detection end to abut against the outer periphery of the spindle (50).

5. The tension unwinding device according to claim 4, characterized in that, The second connector (81) is configured to adjust the elastic tension of the second elastic member (61); and / or The friction band (40) is connected to the mounting plate (70) via a first connector (80), the first connector (80) being configured to adjust the elastic tension of the first elastic member (60).

6. The tension unwinding device according to claim 5, characterized in that, The first elastic element (60) is a tension spring, and the stretching direction of the first elastic element (60) is parallel to the mounting plate (70); and / or The second elastic element (61) is a tension spring, and the stretching direction of the second elastic element (61) is parallel to the mounting plate (70).

7. The tension unwinding device according to claim 6, characterized in that, The first connector (80) and / or the second connector (81) include: Mounting post (801), one end of which is connected to the mounting plate (70), and the other end is provided with a radially penetrating adjustment hole; and Adjusting rod (802), one end of which is connected to the spring foot of the tension spring or the end of the friction band (40), and the other end is connected to an adjusting nut (803). The adjusting nut (803) is partially disposed in the adjusting hole and is configured to be driven to rotate and drive the adjusting rod (802) to rotate in order to adjust the elastic tension of the first elastic element (60) or the second elastic element (61).

8. The tension unwinding device according to any one of claims 1-7, characterized in that, The arc length S of the part of the friction segment (12) that is in contact with the friction band (40) satisfies the following condition with the circumference C of the friction circumference surface of the friction segment (12): S / C≥0.

25.

9. The tension unwinding device according to any one of claims 1-7, characterized in that, The detection end is provided with a roller (23), and the detection rotating rod (20) is configured to cause the roller (23) to roll and rub against the rotating spindle (50) during the feeding process of the spindle (50).

10. The tension unwinding device according to any one of claims 1-7, characterized in that, The tension feeding device (1) further includes: A fast stop (90) is disposed at the end of the unwinding section (11) away from the friction section (12) and is configured to abut the end of the spindle (50) to limit the relative position of the spindle (50) and the unwinding section (11) in the axial direction; and / or An anti-rotation pin (91) is provided on the outer periphery of the unwinding section (11) near the friction section (12) and is configured to insert a spindle core notch (52) into the spindle (50) to limit the relative position of the spindle (50) and the unwinding section (11) in the circumferential direction.

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