A tensioner

Abstract

The utility model relates to tension control technical field, concretely relates to a tension ware, the tension ware includes base and yarn guide wheel subassembly, wherein, the base has the mounting plane, the mounting plane forms the convex ring, the yarn guide wheel subassembly installs the inside of the convex ring and sets up, the yarn guide wheel subassembly includes upper yarn guide wheel seat and lower yarn guide wheel seat, be equipped with a plurality of yarn guide bars between the upper yarn guide wheel seat and lower yarn guide wheel seat, and the yarn is wound in the outer periphery of yarn guide bar, and the upper surface of lower yarn guide wheel seat is coplanar with the upper surface of convex ring, the utility model provides a tension ware, through setting the upper surface of convex ring on base and the upper surface of lower yarn guide wheel seat in yarn guide wheel subassembly are coplanar, thereby prevent yarn and breakage etc.

Description

Technical Field

[0001] This utility model relates to the field of tension control technology, specifically to a tensioner. Background Technology

[0002] Tensioners are key devices in textile machinery used to control and adjust yarn tension. During the warping process, by applying appropriate tension to the yarn, it is ensured that the yarn remains evenly and tightly arranged when wound onto the warp beam, thereby improving the quality and efficiency of subsequent weaving processes.

[0003] Based on their working principles, tensioners can be mainly divided into mechanical tensioners and electromagnetic tensioners. Among them, electromagnetic tensioners, with their more precise tension control, faster response speed, and more stable performance, are gradually becoming the preferred choice in high-end textile production. The core structure of an electromagnetic tensioner includes a tension generating unit such as a hysteresis coil and a guide wheel assembly connected to the central shaft of the hysteresis coil. In actual operation, the yarn is wound around the outer circumference of the guide wheel assembly. When the warp beam drives the yarn, the guide wheel assembly also rotates. At this time, the hysteresis coil generates a controllable damping force through electromagnetic effect, providing continuous and uniform tension to the yarn.

[0004] However, this structure has certain drawbacks in actual operation: when the warp beam suddenly stops, the guide wheel assembly often continues to rotate for a period of time due to inertia. This continuous inertial rotation can cause the yarn wound on the guide wheel to loosen, and some of the loosened yarn may detach from the working area of ​​the guide wheel assembly and slide below it. When the warp beam restarts, the yarn cannot continue to wrap around the guide wheel assembly and breaks. Utility Model Content

[0005] This invention addresses the technical problem in existing tensioners where yarn may run below the guide wheel assembly, leading to breakage during subsequent operation. A new tensioner is proposed that prevents yarn breakage during the next start-up of the warp beam by setting the upper surface of the convex ring on the base to be coplanar with the upper surface of the lower guide wheel seat in the guide wheel assembly.

[0006] The technical solution of this utility model:

[0007] A tensioner, comprising:

[0008] The base has a mounting surface on which a protruding ring is formed;

[0009] A yarn guide wheel assembly is installed inside the convex ring. The yarn guide wheel assembly includes an upper yarn guide wheel seat and a lower yarn guide wheel seat. A plurality of yarn guide rods are provided between the upper yarn guide wheel seat and the lower yarn guide wheel seat. Yarn is wound around the outer periphery of the yarn guide rods. The upper surface of the lower yarn guide wheel seat is coplanar with the upper surface of the convex ring.

[0010] Furthermore, the upper surface of the convex ring and the upper surface of the lower guide wheel seat are inclined at a certain angle toward the yarn inlet side.

[0011] Furthermore, the tensioner also includes a tension generating unit, which is installed inside the convex ring. The center of the upper guide wheel seat is connected to the central axis of the tension generating unit as it rotates. An inclined mounting surface is also formed on the mounting plane inside the convex ring, and a mounting seat is installed on the inclined mounting surface. The lower guide wheel seat is connected to the mounting seat through a bearing.

[0012] The yarn guide rods include a plurality of upper yarn guide rods and lower yarn guide rods arranged at intervals in sequence. The upper yarn guide rods are distributed circumferentially along the upper yarn guide wheel seat. One end of the upper yarn guide rod is connected to the upper yarn guide wheel seat, and the other end is inclined outward at a preset angle and extends into the corresponding lower movable hole on the lower yarn guide wheel seat. The lower yarn guide rods are distributed circumferentially along the lower yarn guide wheel seat. One end of the lower yarn guide rod is connected to the lower yarn guide wheel seat, and the other end is inclined inward at a preset angle and extends into the corresponding upper movable hole on the upper yarn guide wheel seat.

[0013] Furthermore, an inner annular protrusion is formed on the inner side of each yarn guide rod on the lower yarn guide wheel seat, facing the upper yarn guide wheel seat, and an outer annular protrusion is formed on the inner side of each yarn guide rod on the upper yarn guide wheel seat, facing the lower yarn guide wheel seat, with the inner annular protrusion extending into the outer annular protrusion.

[0014] Furthermore, the tension generating unit is a hysteresis device; the tension generating unit is mounted on the bottom of the mounting plane inside the convex ring by means of mounting screws, and a countersunk hole is formed on the mounting plane inside the convex ring corresponding to the mounting screws.

[0015] Furthermore, the tensioner also includes an inlet and a pretensioning assembly. A partition is integrally formed on the base, and the inlet is disposed in the middle of the partition. The yarn passes through the inlet and the pretensioning assembly, then winds around the yarn guide wheel assembly and is led out.

[0016] Furthermore, the pretensioning assembly includes a yarn guide fixed on the base, the yarn guide having a U-shaped groove formed thereon; the yarn guide is also provided with a lower pressure sheet, an upper pressure sheet and a counterweight sheet, the yarn is pressed between the lower pressure sheet and the upper pressure sheet and passes through the U-shaped groove on the yarn guide; the base is also provided with a fixing seat, the fixing seat and the yarn guide are connected by a U-shaped clip, the upper pressure sheet and the counterweight sheet can be flipped onto the fixing seat along the U-shaped clip.

[0017] Furthermore, the yarn is introduced through the inlet and pretension assembly, and wound 1-10 turns on the yarn guide wheel assembly, with the angle between the yarn exit direction and the inlet direction being 0-90 degrees.

[0018] Furthermore, a sensor mounting portion is also formed on the convex ring.

[0019] Furthermore, a control board is horizontally provided at the bottom of the tension generating unit, and the tension generating unit is electrically connected to the control board.

[0020] By adopting the above technical solution, the tensioner provided by this utility model has the following advantages compared with the prior art: This utility model provides a convex ring on the mounting plane, forming a mounting space of a certain size inside the convex ring, and ensuring that the upper surface of the convex ring is coplanar with the upper surface of the lower guide wheel seat in the guide wheel assembly, with only a small rotational gap between the lower guide wheel seat and the convex ring; when the warp beam of the warping machine suddenly stops operating, the guide wheel assembly will continue to operate for a period of time. Even if the yarn wrapped around the outer periphery of the guide wheel assembly becomes loose, it will not move below the lower guide wheel seat; when the warp beam starts again, the yarn can continue to move around the guide wheel assembly without breaking. Furthermore, this utility model only provides a convex ring, which has a small area and is easy to manufacture using molds or other methods. Attached Figure Description

[0021] Figure 1 This is a perspective view of the tensioner of this utility model from a first-view perspective.

[0022] Figure 2 This is a schematic diagram of the yarn guide wheel assembly and tension generating unit of this utility model from a first-view perspective;

[0023] Figure 3 This is a schematic diagram of the yarn guide wheel assembly and tension generating unit of this utility model from a second perspective.

[0024] Figure 4 This is a front view of the tensioner of this utility model;

[0025] Figure 5 for Figure 4 AA section view in the middle;

[0026] Figure 6 for Figure 4 BB section view in the middle;

[0027] Figure 7 This is a perspective view of the tensioner of this utility model from a second-view perspective.

[0028] Figure 8 This is a schematic diagram of the base and tension generating unit of this utility model;

[0029] Figure 9 This is a schematic diagram of the structure of the lower cover and control panel of this utility model.

[0030] in,

[0031] Base 1, mounting plane 11, convex ring 12, inclined mounting surface 121, mounting seat 122, bearing 123, through hole 124, countersunk hole 125, sensor mounting part 126, partition 13, mounting post 14, bayonet 15, supporting plane 151, supporting arc surface 152; yarn guide wheel assembly 2, upper yarn guide wheel seat 21, upper yarn guide rod 22, upper movable hole 23, outer annular protrusion 24, lower yarn guide wheel seat 25, lower yarn guide... Rod 26, lower movable hole 27, inner annular protrusion 28; tension generating unit 3, central shaft 31; guide component 4; pretension assembly 5, yarn guide component 51, U-shaped groove 511, lower pressure yarn sheet 52, upper pressure yarn sheet 53, counterweight 54, fixing seat 55, U-shaped clip 56; control plate 6; lower cover 7, bent edge 71, mounting edge 72, mounting hole 721, nut post 73; pressure plate 8, pressing protrusion 81, pressing pin 82. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0033] 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. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0035] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0036] like Figure 1-9 As shown, this embodiment provides a tensioner, which includes a base 1 and a yarn guide assembly 2. The base 1 is the main housing of the tensioner. The base 1 has a mounting plane 11 for mounting the yarn guide assembly 2. A protruding ring 12 is formed on the mounting plane 11. The inner and outer sidewalls of the protruding ring 12 are preferably both arc surfaces.

[0037] The yarn guide wheel assembly 2 is installed inside the convex ring 12. The yarn guide wheel assembly 2 includes an upper yarn guide wheel seat 21 and a lower yarn guide wheel seat 25. Both the upper yarn guide wheel seat 21 and the lower yarn guide wheel seat 25 are preferably circular plates. A plurality of yarn guide rods are provided between the upper yarn guide wheel seat 21 and the lower yarn guide wheel seat 25. The yarn is wound around the outer periphery of these yarn guide rods. The upper surface of the lower yarn guide wheel seat 25 is coplanar with the upper surface of the convex ring 12.

[0038] In this embodiment, the convex ring 12 is provided on the mounting plane 11. A mounting space of a certain size is formed inside the convex ring 12, and the upper surface of the convex ring 12 is coplanar with the upper surface of the lower guide wheel seat 25 in the guide wheel assembly 2. There is only a small rotational gap between the lower guide wheel seat 25 and the convex ring 12. When the warp beam of the warping machine suddenly stops, the guide wheel assembly 2 will continue to operate for a period of time. Even if the yarn wrapped around the outer periphery of the guide wheel assembly 2 becomes loose, it will not move below the lower guide wheel seat 25. When the warp beam starts again, the yarn can continue to move around the guide wheel assembly 2 without breaking. Furthermore, this embodiment only provides the convex ring 12, which has a small area and is easy to manufacture using molds or other methods.

[0039] Preferably, in this embodiment, the upper surface of the convex ring 12 and the upper surface of the lower guide roller seat 25 are both inclined at a certain angle towards the yarn inlet side, for example, 2-3 degrees. This facilitates the smooth entry of the yarn from the inlet side into the guide roller assembly 2, and prevents the yarn from contacting the top edge of the convex ring 12 near the yarn inlet side, thus preventing damage to the yarn and affecting its tension. In addition, by setting the inclination angle, impurities such as lint and fibers can slide directly off or slide off onto the mounting plane 11 outside the convex ring 12 during vibration. Since the convex ring 12 occupies a small proportion of the mounting plane 11, the mold structure can be simplified, making it easier to manufacture, and allowing impurities such as lint and fibers to fall onto the mounting plane 11 outside the convex ring 12 more quickly.

[0040] like Figure 5-6 As shown, the tensioner in this embodiment also includes a tension generating unit 3, which is installed inside the convex ring 12. The tension generating unit 3 is preferably a hysteresis device. The center of the upper guide wheel seat 21 is rotated and connected to the central shaft 31 of the tension generating unit 3, for example, by direct fixation or by means of pins, keys, etc. An inclined mounting surface 121 is also recessed on the mounting plane 11 inside the convex ring 12. A mounting seat 122 is mounted on the inclined mounting surface 121. The lower guide wheel seat 25 is connected to the mounting seat 122 via a bearing 123, such that the centerline of the lower guide wheel seat 25 is inclined at a certain angle relative to the centerline of the upper guide wheel seat 21. Through holes 124 are provided on the mounting seat 122 and the mounting plane 11 to allow the central shaft 31 to pass through. The mounting plane 11 inside the convex ring 12 can be further recessed to a certain depth as needed to facilitate the installation of various components.

[0041] like Figure 1-3As shown, the yarn guide rod includes a plurality of upper yarn guide rods 22 and lower yarn guide rods 26 arranged sequentially at intervals. For example, each upper yarn guide rod 22 is adjacent to two lower yarn guide rods 26 on both sides, and each lower yarn guide rod 26 is adjacent to two upper yarn guide rods 22 on both sides. The upper yarn guide rods 22 are distributed circumferentially along the upper yarn guide wheel seat 21. One end of each upper yarn guide rod 22 is fixedly connected to the upper yarn guide wheel seat 21, and the other end is inclined outward at the same preset angle, for example, 3-7 degrees. A corresponding lower movable hole 27 is provided on the lower yarn guide wheel seat 25, and the other end of each upper yarn guide rod 22 extends into the lower movable hole 27 on the lower yarn guide wheel seat 25. The lower guide rods 26 are distributed circumferentially along the lower guide wheel seat 25. One end of each lower guide rod 26 is fixedly connected to the lower guide wheel seat 25, and the other end is inclined inward at a set angle, for example, 3-7 degrees. Correspondingly, an upper movable hole 23 is provided on the upper guide wheel seat 21, and the other end of each lower guide rod 26 extends into the upper movable hole 23 on the upper guide wheel seat 21. In this way, when the yarn moves, it can spiral upward along the outer circumference of each guide rod, and it can ensure that when the yarn is wound around the outer circumference of each guide rod, it will not directly detach from above or below.

[0042] Furthermore, the lower guide wheel seat 25 has an inner annular protrusion 28 formed on the inner side of each guide rod facing the upper guide wheel seat 21, and the upper guide wheel seat 21 has an outer annular protrusion 24 formed on the inner side of each guide rod facing the lower guide wheel seat 25. The inner annular protrusion 28 extends into the outer annular protrusion 24. This prevents impurities such as lint and fibers from entering the inner central shaft 31 and bearing 123, reducing the impact on rotation, and preventing them from falling downwards from the through hole 124 in the middle of the mounting base 122.

[0043] The tension generating unit 3 is mounted on the bottom of the mounting plane 11 inside the convex ring 12 by means of mounting screws. The mounting plane 11 inside the convex ring 12 has a countersunk hole 125 corresponding to the mounting screws; this does not affect the setting of the mounting base 122.

[0044] The tensioner in this embodiment also includes an inlet 4 and a pretension assembly 5. A partition 13 is integrally formed on the base 1, and the inlet 4 is disposed in the middle of the partition 13. The inlet 4 is preferably an inlet ceramic eye. The yarn enters the guide wheel assembly 2 after passing through the inlet 4 and the pretension assembly 5, and then winds around the guide wheel assembly 2 before being led out. Figure 4 As shown, the yarn is introduced through the inlet 4 and the pretension assembly 5, and wound around the yarn guide wheel assembly 2 for 1-10 turns, preferably 3-4 turns, in a clockwise or counterclockwise direction; the angle α between the yarn exit direction and the inlet direction is 0-90 degrees, preferably 90 degrees, to facilitate the yarn being led out to the warping machine.

[0045] Furthermore, the pretension assembly 5 in this embodiment includes a yarn guide 51 fixed on the base 1. The yarn guide 51 is preferably a yarn guide eye, and a U-shaped groove 511 is formed on it. A lower pressure sheet 52, an upper pressure sheet 53, and a counterweight 54 are sequentially fitted onto the yarn guide 51. The yarn is pressed between the lower pressure sheet 52 and the upper pressure sheet 53 at a certain height and passes through the U-shaped groove 511 on the yarn guide 51, thereby providing a certain pretension as needed. A fixing seat 55 is also provided on the base 1. A U-shaped clip 56 connects the fixing seat 55 and the yarn guide 51. The upper pressure sheet 53 and the counterweight 54 can also be flipped along the U-shaped clip 56 onto the fixing seat 55 to adjust the pretension as needed.

[0046] Furthermore, in this embodiment, a sensor mounting portion 126 is also formed on the convex ring 12, that is, a protrusion extends from the outer side wall of the convex ring 12 corresponding to the yarn exit position to form the sensor mounting portion 126, which can be used to mount a tension detection sensor for detecting tension.

[0047] Furthermore, the tension generating unit 3 is vertically positioned, with a control plate 6 horizontally mounted at its bottom. The tension generating unit 3 is electrically connected to the control plate 6 via a cable, and its operation is controlled by the control plate 6 to generate appropriate tension. The control plate 6 is also connected to the tension detection sensor to achieve tension feedback and adjustment, ensuring stable output tension. In existing tensioners, the control plate 6 is generally vertically positioned to the side of the tension generating unit 3, for example... Figure 6 On the right side of the structure. Compared with the prior art, this embodiment places the control board 6 at the bottom of the tension generating unit 3. The size of the control board 6 can be set to be larger, allowing for functional expansion as needed and facilitating the arrangement of components on the control board 6. Furthermore, a speed detection sensor can be easily installed on the control board 6 to detect the speed of the tension generating unit 3, thereby detecting problems such as wire breakage. In addition, space is reserved on the side of the tension generating unit 3 to facilitate cable arrangement and the addition of other components.

[0048] In this embodiment, the base 1 has an opening at its bottom, which is covered by a lower cover 7. The control plate 6 is mounted on the lower cover 7 on the side near the base 1. This facilitates the installation of the tension generating unit 3 and the control plate 6, and the lower cover 7 can be designed to match the structural dimensions of the control plate 6, making it easy for future expansion and upgrades. The lower cover 7 is preferably made of metal, and more preferably of a non-magnetic material such as aluminum, to reduce interference with the tension generating unit 3. The metal material of the lower cover 7 allows heat from the tensioner to dissipate quickly, especially the heat generated by the control plate 6 mounted on the lower cover 7, which can be directly and quickly dissipated through the lower cover 7. Several nut posts 73 can be provided on the bottom surface of the lower cover 7 to support the control plate 6, and several connecting holes are provided on the control plate 6 for installation with screws; the nut posts 73 can be fixed to the lower cover 7 by riveting or other methods. The base 1 is preferably made of plastic, which is lightweight, low-cost, and easy to manufacture.

[0049] Furthermore, in this embodiment, the outer edge of the bottom surface of the lower cover 7 is bent towards the base 1 to form a bent edge 71. The inner side of the bent edge 71 and the bottom surface of the lower cover 7 form the mounting space for the control board 6. In this way, in addition to the bottom of the control board 6, the heat around the control board 6 can also be dissipated outwards more quickly. The bent edge 71 is also bent outwards to form a mounting edge 72. The mounting edge 72 is provided with multiple mounting holes 721. A plurality of mounting posts 14 are correspondingly formed in the base 1. The mounting can be connected to the mounting posts 14 by screws passing through the mounting holes 721 for installation.

[0050] Preferably, the control board 6 is also equipped with a speed detection sensor. The speed detection sensor can be, but is not limited to, a Hall switch, a proximity switch, etc., and a corresponding triggering element needs to be set on the rotating part of the tension generating unit 3. This allows for convenient speed detection, thereby enabling real-time determination of problems such as wire breakage.

[0051] Furthermore, in this embodiment, a bayonet 15 is formed on the base 1. The bayonet 15 is generally U-shaped, with a supporting plane 151 formed on its bottom surface, and a supporting arc surface 152 formed in the middle of the supporting plane 151. A pressure plate 8 is also provided on the open side of the bayonet 15. One end of the pressure plate 8 is hinged to the base 1, and the other end is detachably connected to the base 1 by screws. A pressing protrusion 81 is formed on the inner side of the pressure plate 8, and a pressing pin 82 is threaded onto the pressing protrusion 81. The tensioner can be clamped and installed on a vertical pipe. If the pipe is a square pipe, it is clamped by the supporting plane 151 and the pressing protrusion 81 on the inner side of the pressure plate 8; if the pipe is a round pipe, it is clamped by the supporting arc surface 152 and the pressing pin 82 on the pressure plate 8. Thus, it can be adapted to various pipes for installation.

[0052] As can be seen from the above, the tensioner provided in this embodiment prevents problems such as yarn breakage when the warp beam is subsequently started by setting the upper surface of the convex ring on the base to be coplanar with the upper surface of the lower guide wheel seat in the guide wheel assembly.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tensioner, characterized in that, include: A base (1) having a mounting plane (11) on which a protruding ring (12) is formed; The yarn guide wheel assembly (2) is installed on the inner side of the convex ring (12). The yarn guide wheel assembly (2) includes an upper yarn guide wheel seat (21) and a lower yarn guide wheel seat (25). A plurality of yarn guide rods are provided between the upper yarn guide wheel seat (21) and the lower yarn guide wheel seat (25). The yarn is wound around the outer periphery of the yarn guide rods. The upper surface of the lower yarn guide wheel seat (25) is coplanar with the upper surface of the convex ring (12).

2. The tensioner according to claim 1, characterized in that, The upper surface of the convex ring (12) and the upper surface of the lower guide wheel seat (25) are inclined at a certain angle toward the yarn inlet side.

3. The tensioner according to claim 2, characterized in that, The tensioner also includes a tension generating unit (3), which is installed inside the convex ring (12). The center of the upper guide wheel seat (21) is connected to the central axis (31) of the tension generating unit (3) as it rotates. An inclined mounting surface (121) is also formed on the mounting plane (11) inside the convex ring (12). A mounting seat (122) is installed on the inclined mounting surface (121). The lower guide wheel seat (25) is connected to the mounting seat (122) through a bearing (123). The yarn guide rods include a plurality of upper yarn guide rods (22) and lower yarn guide rods (26) arranged at intervals in sequence. The upper yarn guide rods (22) are distributed circumferentially along the upper yarn guide wheel seat (21). One end of the upper yarn guide rod (22) is connected to the upper yarn guide wheel seat (21), and the other end is inclined outward at a preset angle and extends into the corresponding lower movable hole (27) on the lower yarn guide wheel seat (25). The lower yarn guide rods (26) are distributed circumferentially along the lower yarn guide wheel seat (25). One end of the lower yarn guide rod (26) is connected to the lower yarn guide wheel seat (25), and the other end is inclined inward at a preset angle and extends into the corresponding upper movable hole (23) on the upper yarn guide wheel seat (21).

4. The tensioner according to claim 3, characterized in that, The lower guide wheel seat (25) has an inner annular protrusion (28) on the inner side of each guide rod and facing the upper guide wheel seat (21), and the upper guide wheel seat (21) has an outer annular protrusion (24) on the inner side of each guide rod and facing the lower guide wheel seat (25), with the inner annular protrusion (28) extending into the outer annular protrusion (24).

5. The tensioner according to claim 3, characterized in that, The tension generating unit (3) is a hysteresis device; the tension generating unit (3) is mounted on the bottom of the mounting plane (11) inside the convex ring (12) by means of mounting screws, and a countersunk hole (125) is formed on the mounting plane (11) inside the convex ring (12) corresponding to the mounting screws.

6. The tensioner according to claim 1, characterized in that, The tensioner also includes an inlet (4) and a pretension assembly (5). A partition (13) is integrally formed on the base (1). The inlet (4) is disposed in the middle of the partition (13). The yarn passes through the inlet (4) and the pretension assembly (5) and is wound around the yarn guide wheel assembly (2) before being led out.

7. The tensioner according to claim 6, characterized in that, The pretensioning assembly (5) includes a yarn guide (51) fixed on the base (1), and a U-shaped groove (511) is formed on the yarn guide (51); the yarn guide (51) is also provided with a lower pressure plate (52), an upper pressure plate (53) and a counterweight plate (54), the yarn is pressed between the lower pressure plate (52) and the upper pressure plate (53) and passes through the U-shaped groove (511) on the yarn guide (51); the base (1) is also provided with a fixing seat (55), and a U-shaped clip (56) is connected between the fixing seat (55) and the yarn guide (51), the upper pressure plate (53) and the counterweight plate (54) can be flipped along the U-shaped clip (56) onto the fixing seat (55).

8. The tensioner according to claim 6, characterized in that, The yarn is introduced through the inlet (4) and the pretension assembly (5), and wound 1-10 turns on the yarn guide wheel assembly (2). The angle between the yarn exit direction and the inlet direction is 0-90 degrees.

9. The tensioner according to claim 1, characterized in that, A sensor mounting portion (126) is also formed on the convex ring (12).

10. The tensioner according to claim 3, characterized in that, The tension generating unit (3) has a horizontally mounted control plate (6) at its bottom, and the tension generating unit (3) is electrically connected to the control plate (6).

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