Air-jet vortex spinning yarn guide cone and air-jet vortex spinning method

Abstract

The invention relates to an air-jet vortex spinning yarn guiding cone and an air-jet vortex spinning method, and belongs to the technical field of spinning machinery, the air-jet vortex spinning yarn guiding cone comprises a yarn guiding cone body, the yarn guiding cone body comprises a first circular truncated cone section, a second circular truncated cone section, a first cylindrical section and a second cylindrical section which are sequentially connected from upstream to downward movement and are coaxially arranged, the cone angle of the first circular truncated cone section is 12-20 degrees, and the cone angle of the second circular truncated cone section is 12-20 degrees. The axial length of the first circular truncated cone section is 19%-22% of the length of a spun fiber body, and the diameter of the downstream end of the first circular truncated cone section is 12%-16% of the length of the spun fiber body. Compared with the prior art, yarns with more excellent mechanical properties can be spun by the air-jet vortex spinning nozzle under the working condition that the total air pressure in the air chamber is 0.4 MPa-0. 65 MPa.

Description

Technical Field

[0001] The invention relates to an air jet vortex spinning guide cone and an air jet vortex spinning method, belonging to the field of spinning machinery and technology. Background Art

[0002] Air jet vortex spinning is an advanced spinning technology, the core of which is to use the high-speed rotating airflow formed in the nozzle device to achieve fiber twisting. In this process, the head end of the fiber entering the nozzle device is first introduced into the entrance of the yarn delivery cone and becomes the core part of the yarn, that is, the core fiber. These core fibers are arranged in parallel and constitute the basic structure of the yarn. At the same time, the tail end of the fiber is affected by the high-speed rotating airflow, and they will fall on the outer wall of the head end of the yarn delivery cone and rotate with the rotation of the airflow. These tail end fibers are entangled with the outside of the core fiber during the rotation process, forming a wrapped fiber, which provides additional strength and stability for the yarn. Compared with traditional ring yarn, the structure of air jet vortex yarn is looser, and the degree of internal and external transfer between fibers is lower, which leads to its relatively low strength and inferior mechanical properties to ring yarn. This structural difference makes air jet vortex yarn may not perform as well as ring yarn in some application scenarios.

[0003] As a key component of the air jet vortex spinning nozzle, the design and structure of the yarn guide cone have a direct impact on the motion state of the fiber during the twisting process. Therefore, the design of the yarn guide cone is directly related to the structure and mechanical properties of the air jet vortex yarn. A well-designed yarn guide cone can optimize the motion trajectory of the fiber, thereby improving the structure of the yarn and enhancing its mechanical properties.

[0004] In this technical field, an important research direction is how to design and manufacture a new type of air jet vortex spinning cone to improve the mechanical properties of the yarn. This cone needs to be able to more effectively control the movement of the fibers and increase the internal and external transfer between the fibers, thereby improving the strength and overall performance of the yarn. By improving the structure of the cone, the air jet vortex yarn can maintain its unique advantages while being comparable to or even surpassing the mechanical properties of traditional ring yarn. This will bring new technological breakthroughs to the textile industry and meet the market demand for high-performance yarns. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a jet vortex spinning yarn guide cone which can make the spun yarn have more excellent mechanical properties.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention provides a jet vortex spinning yarn guide cone, including a yarn guide cone, wherein the yarn guide cone includes a first frustum segment, a second frustum segment, a first cylindrical segment, and a second cylindrical segment which are connected and coaxially arranged in sequence from upstream to downward, the cone angle of the first frustum segment is 12° to 20°, the axial length of the first frustum segment is 19% to 22% of the length of the main body of the spun fiber, and the diameter of the downstream end of the first frustum segment is 12% to 16% of the length of the main body of the spun fiber.

[0007] Preferably, the diameter of the upstream end of the second truncated cone segment is equal to the downstream diameter of the first truncated cone segment, the cone angle of the second truncated cone segment is 62° to 68°, and the axial length of the second truncated cone segment is 18% to 20% of the length of the spun fiber body.

[0008] Preferably, the interior of the yarn guide cone is provided with a first cylindrical hole, a second cylindrical hole, a first truncated cone hole, a second truncated cone hole, and a third cylindrical hole which are sequentially connected and coaxially arranged from upstream to downstream, and the upstream end of the first truncated cone section is provided with an entrance connected to the first cylindrical hole.

[0009] Preferably, the diameter of the first cylindrical hole is smaller than the diameter of the second cylindrical hole, the diameter of the second cylindrical hole is smaller than the upstream end diameter of the first truncated cone hole, the upstream end diameter of the second truncated cone hole is equal to the downstream end diameter of the first truncated cone hole, and the downstream end diameter of the second truncated cone hole is equal to the diameter of the third cylindrical hole.

[0010] Preferably, part or all of the first cylindrical hole is provided inside the first conical segment, part or all of the second cylindrical hole and the first conical hole are provided inside the second conical segment, part or all of the second conical hole is provided inside the first cylindrical segment, and part or all of the third cylindrical hole is provided inside the second cylindrical segment.

[0011] The technical solution of the present invention also provides a jet vortex spinning method. When spinning yarn with a linear density not exceeding 40 tex, the diameter d of the first cylindrical hole and the linear density T of the yarn satisfy the following formula:

[0012] d=0.655+0.043T-0.0006T 2

[0013] The unit of diameter d is mm, and the unit of linear density T is tex.

[0014] Preferably, viscose fiber with a main body length of 38 mm is used as raw material, and the diameter d of the first cylindrical hole and the diameter of the entrance are both 1.3 mm, the cone angle α of the first frustum segment is set to 17°, the axial length h1 is 20.8% of the main body length of the spun fiber, the downstream end diameter of the first frustum segment is 14.1% of the main body length of the spun fiber, the cone angle β of the second frustum segment is 65°, and the axial length h2 is 18.9% of the main body length of the spun fiber.

[0015] Preferably, combed cotton fiber with a main body length of 33 mm is used as raw material, and the diameter d of the first cylindrical hole and the diameter of the entrance are both 1.4 mm, the cone angle α of the first frustum segment is set to 14°, the axial length h1 accounts for 19.7% of the main body length of the spun fiber, the downstream end diameter of the first frustum segment accounts for 15.3% of the main body length of the spun fiber, the cone angle β of the second frustum segment is 67°, and the axial length h2 accounts for 19.1% of the main body length of the spun fiber.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The yarn guide cone of the present invention is configured such that the cone angle of the first truncated cone section is set to 12° to 20°, the axial length is set to 19% to 22% of the length of the main body of the spun fiber, the downstream end diameter is set to 12% to 16% of the length of the main body of the spun fiber, the cone angle of the second truncated cone section is set to 62° to 68°, the axial length is set to 18% to 20% of the length of the main body of the spun fiber, and when spinning a yarn with a linear density not exceeding 40 tex, the relationship between the diameter d (unit: mm) of the first cylindrical hole and the linear density T (unit: tex) of the yarn satisfies d=0.655+0.043T-0.0006T. 2 , the jet vortex spinning nozzle can spin yarn with better mechanical properties than those of the prior art under the working condition that the total air pressure in the air chamber is 0.4MPa to 0.65MPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A longitudinal sectional view of the general structure of a jet vortex spinning nozzle device according to a specific embodiment of the present invention;

[0019] Figure 2 A three-dimensional diagram of a yarn guide cone according to Embodiment 1 of the present invention;

[0020] Figure 3 A longitudinal sectional view of a yarn guide cone according to Embodiment 1 of the present invention;

[0021] Figure 4 A three-dimensional diagram of a yarn guide cone according to Embodiment 2 of the present invention;

[0022] Figure 5 It is a longitudinal sectional view of the yarn guide cone according to Embodiment 2 of the present invention.

[0023] Figure numerals: 1, yarn guide cone; 2, first truncated cone section; 3, second truncated cone section; 4, first cylindrical section; 5, second cylindrical section; 6, first cylindrical hole; 7, second cylindrical hole; 8, first truncated cone hole; 9, second truncated cone hole; 10, third cylindrical hole; 11, inlet; 12, jet vortex spinning nozzle device; 13, fiber guide assembly; 14, vortex tube; 15, yarn guide tube; 16, nozzle housing; 17, guide body; 18, guide needle; 19, fiber guide channel; 20, cylindrical space; 21, air flow injection hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The present invention discloses a jet vortex spinning cone and a jet vortex spinning method, aiming to improve the mechanical properties of the jet vortex yarn to meet the needs of high-quality production. Figure 1 As shown, the yarn delivery cone 1 is located inside the air jet vortex spinning nozzle device 12. The nozzle device 12 is provided with a fiber guide assembly 13, a vortex tube 14, a yarn delivery cone 1 and a yarn delivery tube 15 in sequence from upstream to downstream. The fiber guide assembly 13, the vortex tube 14, the yarn delivery cone 1 and the yarn delivery tube 15 are installed in a nozzle housing 16.

[0026] The fiber guide assembly 13 is provided with a guide body 17 and a guide needle 18 , and forms a fiber guide channel 19 for guiding the fiber bundle delivered by a drafting device (not shown) into the nozzle device 12 .

[0027] The vortex tube 14 is provided with a cylindrical space 20 for introducing the fiber bundle and airflow injection holes 21 arranged on the wall surface of the vortex tube 14 and distributed at equal intervals in the circumferential direction. Compressed air is injected into the cylindrical space 20 inside the vortex tube 14 through the airflow injection holes 21, thereby forming a high-speed rotating airflow in the space. The high-speed rotating airflow causes the fiber bundle to rotate while being transported downstream.

[0028] The head end of the yarn drawing cone 1 is located in the cylindrical space 20 inside the vortex tube 14, and is used to support the tail end of the fiber bundle when the tail end of the fiber bundle falls on the outer wall surface of the head end of the yarn drawing cone 1 under the action of the high-speed rotating airflow and rotates with the airflow. A yarn drawing tube 15 is provided downstream of the yarn drawing cone 1, which is used to draw the yarn (not shown) from the nozzle device 12.

[0029] The structure of the yarn guide cone 1 consists of four main parts, namely a first truncated cone section 2, a second truncated cone section 3, a first cylindrical section 4 and a second cylindrical section 5. These parts are sequentially connected from upstream to downstream and are coaxially arranged.

[0030] In this design, the cone angle of the first truncated cone section 2 is precisely controlled between 12° and 20°. Such a cone angle design helps the fiber tail end to fall more fully on the outer wall surface of the head end of the yarn delivery cone 1. At the same time, the axial length of the first truncated cone section 2 is set to 19% to 22% of the length of the main body of the spun fiber. Such a length ratio helps to maintain the expansion of the fiber tail end at the outer wall surface of the head end of the yarn delivery cone 1. In addition, the diameter of the downstream end of the first truncated cone section 2 is set to 12% to 16% of the length of the main body of the spun fiber. The precise control of this size helps to ensure that the fiber tail end is subjected to a stable rotating airflow during the rotation process.

[0031] The cone angle of the second truncated cone section 3 is set between 62° and 68°. This cone angle design helps the yarn guide cone 1 to effectively support the tail end of the rotating fiber. The axial length of the second truncated cone section 3 is 18% to 20% of the main length of the spun fiber. This length ratio helps to reduce the probability of the fiber being pulled out by the airflow and becoming a falling fiber. The diameter of the downstream end of the first truncated cone section 2 is equal to the diameter of the upstream end of the second truncated cone section 3. This design ensures a smooth transition of the fiber between the two truncated cone sections, improves the stability of the rotating airflow, and is conducive to the formation of better quality yarn.

[0032] The channel inside the yarn guide cone 1 is provided with a first cylindrical hole 6, a second cylindrical hole 7, a first truncated cone hole 8, a second truncated cone hole 9 and a third cylindrical hole 10 which are connected and coaxially arranged from upstream to downstream. The design of these channels not only ensures the smooth passage of the yarn, but also the effective cooperation between the yarn guide cone 1 and the yarn guide tube 15. In particular, the relationship between the diameter d (unit: mm) of the first cylindrical hole 6 and the linear density T (unit: tex) of the yarn is expressed by the formula d = 0.655 + 0.043T - 0.0006T 2 Accurate calculations are made to meet the needs of yarns with different linear densities, ensuring that when spinning yarns with a linear density not exceeding 40tex, the match between the aperture and the yarn linear density can be optimal.

[0033] The yarn guide cone 1 of the present invention can spin air-jet vortex yarn with better mechanical properties by precisely controlling the size and angle of each part and the design of the internal channel. This design not only improves the breaking strength of the yarn, but also helps to improve the uniformity and wear resistance of the yarn, thereby facilitating the high-quality production of air-jet vortex yarn. Through the application of this yarn guide cone 1, the spinning efficiency and product quality can be significantly improved, meeting the market demand for high-quality textiles.

[0034] Embodiment 1:

[0035] Figures 2 to 3 The present invention shows in detail a jet vortex spinning guide cone provided in Example 1. The guide cone 1 is a key component for spinning jet vortex pure viscose yarn, which can use viscose fiber with a main body length of 38 mm as a raw material and spin jet vortex pure viscose yarn with a linear density T of 21 tex at a nozzle air pressure of 0.58 MPa.

[0036] The design of the yarn guide cone 1 is a fine rotating body structure, which consists of four main parts: the first truncated cone section 2, the second truncated cone section 3, the first cylindrical section 4 and the second cylindrical section 5. These parts are connected in sequence from upstream to downstream and arranged coaxially to form a continuum to provide support for the rotation of the fiber bundle and make the rotating airflow in the cylindrical space 20 uniform and stable. On the upstream end face of the first truncated cone section 2, an inlet 11 is provided for the fiber bundle to enter the interior of the yarn guide cone 1. The internal channel is provided with a first cylindrical hole 6, a second cylindrical hole 7, a first truncated cone hole 8, a second truncated cone hole 9 and a third cylindrical hole 10, which are connected and coaxially arranged in sequence from upstream to downstream. In particular, the inlet 11 is connected to the first cylindrical hole 6 to ensure that the fiber bundle can smoothly enter the interior of the yarn guide cone 1.

[0037] In this embodiment, the diameter d of the first cylindrical hole 6 is equal to the diameter of the inlet 11, both of which are 1.3 mm. This design satisfies the formula d=0.655+0.043T-0.0006T 2 , where T is the linear density of the yarn. Such a design makes the diameter of the first cylindrical hole 6 match the linear density of the spun yarn, which is conducive to the close collection of fibers in the yarn. The outlet of the first cylindrical hole 6 is located near the downstream end of the first truncated cone section 2, which helps the fiber bundle to smoothly enter the yarn guide tube 15 after being output from the first cylindrical hole 6.

[0038] The cone angle α of the first truncated cone section 2 is set to 17°, and the axial length h1 is 7.9 mm, accounting for 20.8% of the main length of the spun fiber. This design helps the fiber tail end to fall more fully and expand on the outer wall surface of the head end of the yarn guide cone 1. The diameter of the downstream end of the first truncated cone section 2 is 5.36 mm, accounting for 14.1% of the main length of the spun fiber. The precise control of this size helps to ensure that the fiber tail end is subjected to a stable rotating airflow during the rotation process.

[0039] The diameter of the upstream end of the second truncated cone section 3 is equal to the diameter of the downstream end of the first truncated cone section 2, the cone angle β is 65°, and the axial length h2 is 7.2 mm, accounting for 18.9% of the main length of the spun fiber. Such a design helps the yarn guide cone 1 to effectively support the tail end of the rotating fiber and reduce the probability of the fiber being pulled by the airflow and becoming a falling fiber. The diameter of the second cylindrical hole 7 is larger than the diameter of the first cylindrical hole 6, and the diameter of the upstream end of the first truncated cone 8 is larger than the diameter of the second cylindrical hole 7. This increasing diameter design helps the effective cooperation between the yarn guide cone 1 and the yarn guide tube 15, and helps to make full use of the internal space of the yarn guide cone 1 to provide stable compressed air for the yarn guide tube 15.

[0040] The second cylindrical hole 7 and the first truncated cone hole 8 are roughly located inside the second truncated cone section 3, and the diameter of the upstream end of the second truncated cone hole 9 is equal to the diameter of the downstream end of the first truncated cone hole 8, and the diameter of the downstream end is equal to the diameter of the third cylindrical hole 10. The second truncated cone hole 9 is roughly located inside the first cylindrical section 4, and the third cylindrical hole 10 is roughly located inside the second cylindrical section 5. This layout helps to make full use of the internal space of the yarn guide cone 1 and provide stable compressed air for the yarn guide tube 15. The diameter of the second cylindrical section 5 is larger than the diameter of the first cylindrical section 4, forming a step surface, which helps to stably install the yarn guide cone 1 in the nozzle housing 16.

[0041] Compared with the prior art, the breaking strength of the air-jet vortex viscose yarn spun under the above working conditions using the yarn guide cone 1 of this embodiment is increased by 8%, and this significant improvement is conducive to the high-quality production of the air-jet vortex yarn. This improvement is not only due to the precise design of the yarn guide cone 1, but also due to the reasonable layout and size control of its internal channels, which are helpful to improve the uniformity and strength of the yarn, thereby meeting the production requirements of high-quality textiles.

[0042] Embodiment 2:

[0043] Figures 4 to 5A jet vortex spinning yarn guide cone provided in Example 2 is shown in detail, wherein the same components as those in Example 1 are marked with the same reference numerals. The yarn guide cone 1 is a key component for spinning jet vortex pure cotton yarn, which can use combed cotton fiber with a main body length of 33 mm as a raw material and spin jet vortex pure cotton yarn with a linear density T of 32 tex at a nozzle air pressure of 0.63 MPa.

[0044] The design of the yarn guide cone 1 is a fine rotating body structure, which consists of four main parts: the first truncated cone section 2, the second truncated cone section 3, the first cylindrical section 4 and the second cylindrical section 5. These parts are connected in sequence from upstream to downstream and arranged coaxially to form a continuum to provide support for the rotation of the fiber bundle and make the rotating airflow in the cylindrical space 20 uniform and stable. On the upstream end face of the first truncated cone section 2, an inlet 11 is provided for the fiber bundle to enter the interior of the yarn guide cone 1. The internal channel is provided with a first cylindrical hole 6, a second cylindrical hole 7, a first truncated cone hole 8, a second truncated cone hole 9 and a third cylindrical hole 10, which are connected and coaxially arranged in sequence from upstream to downstream. In particular, the inlet 11 is connected to the first cylindrical hole 6 to ensure that the fiber bundle can smoothly enter the interior of the yarn guide cone 1.

[0045] In this embodiment, the diameter d of the first cylindrical hole 6 is equal to the diameter of the inlet 11, both of which are 1.4 mm. This design satisfies the formula d=0.655+0.043T-0.0006T 2 , where T is the linear density of the yarn. Such a design makes the diameter of the first cylindrical hole 6 match the linear density of the spun yarn, which is conducive to the close collection of fibers in the yarn. The outlet of the first cylindrical hole 6 is located near the downstream end of the first truncated cone section 2, which helps the fiber bundle to smoothly enter the yarn guide tube 15 after being output from the first cylindrical hole 6.

[0046] The cone angle α of the first truncated cone section 2 is set to 14°, and the axial length h1 is 6.5 mm, accounting for 19.7% of the main length of the spun fiber. This design helps the fiber tail end to fall more fully and expand on the outer wall surface of the head end of the yarn guide cone 1. The diameter of the downstream end of the first truncated cone section 2 is 5.05 mm, accounting for 15.3% of the main length of the spun fiber. The precise control of this size helps to ensure that the fiber tail end is subjected to a stable rotating airflow during the rotation process.

[0047] The diameter of the upstream end of the second truncated cone section 3 is equal to the diameter of the downstream end of the first truncated cone section 2, the cone angle β is 67°, and the axial length h2 is 6.3 mm, accounting for 19.1% of the main length of the spun fiber. Such a design helps the yarn guide cone 1 to effectively support the tail end of the rotating fiber and reduce the probability of the fiber being pulled by the airflow and becoming a falling fiber. The diameter of the second cylindrical hole 7 is larger than the diameter of the first cylindrical hole 6, and the diameter of the upstream end of the first truncated cone 8 is larger than the diameter of the second cylindrical hole 7. This incremental diameter design helps the effective cooperation between the yarn guide cone 1 and the yarn guide tube 15, and helps to make full use of the internal space of the yarn guide cone 1 to provide stable compressed air for the yarn guide tube 15.

[0048] The second cylindrical hole 7 and the first truncated cone hole 8 are roughly located inside the second truncated cone section 3, and the diameter of the upstream end of the second truncated cone hole 9 is equal to the diameter of the downstream end of the first truncated cone hole 8, and the diameter of the downstream end is equal to the diameter of the third cylindrical hole 10. The second truncated cone hole 9 is roughly located inside the first cylindrical section 4, and the third cylindrical hole 10 is roughly located inside the second cylindrical section 5. This layout helps to make full use of the internal space of the yarn guide cone 1 and provide stable compressed air for the yarn guide tube 15. The diameter of the second cylindrical section 5 is larger than the diameter of the first cylindrical section 4, forming a step surface, which helps to stably install the yarn guide cone 1 in the nozzle housing 16.

[0049] Compared with the prior art, the breaking strength of the air jet vortex pure cotton yarn spun under the above working conditions using the yarn guide cone 1 of this embodiment is increased by 12%, and this significant improvement is conducive to the high-quality production of the air jet vortex yarn. This improvement is not only due to the precise design of the yarn guide cone 1, but also due to the reasonable layout and size control of its internal channels, which are helpful to improve the uniformity and strength of the yarn, thereby meeting the production requirements of high-quality textiles.

[0050] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A jet vortex spinning yarn guide cone, characterized in that: The invention comprises a yarn guide cone (1), wherein the yarn guide cone (1) comprises a first truncated cone section (2), a second truncated cone section (3), a first cylindrical section (4), and a second cylindrical section (5) which are sequentially connected and coaxially arranged from upstream to downstream, wherein the cone angle of the first truncated cone section (2) is 12° to 20°, the axial length of the first truncated cone section (2) is 19% to 22% of the length of the main body of the spun fiber, and the diameter of the downstream end of the first truncated cone section (2) is 12% to 16% of the length of the main body of the spun fiber.

2. The air jet vortex spinning yarn guide cone according to claim 1, characterized in that: The diameter of the upstream end of the second frustoconical segment (3) is equal to the downstream diameter of the first frustoconical segment (2), the cone angle of the second frustoconical segment (3) is 62° to 68°, and the axial length of the second frustoconical segment (3) is 18% to 20% of the length of the main body of the spun fiber.

3. The air jet vortex spinning yarn guide cone according to claim 2, characterized in that: The yarn guide cone (1) is provided with a first cylindrical hole (6), a second cylindrical hole (7), a first truncated cone hole (8), a second truncated cone hole (9), and a third cylindrical hole (10) which are connected in sequence and coaxially arranged from upstream to downstream, and the upstream end of the first truncated cone section (2) is provided with an inlet (11) connected to the first cylindrical hole (6).

4. The air jet vortex spinning yarn guide cone according to claim 3, characterized in that: The diameter of the first cylindrical hole (6) is smaller than the diameter of the second cylindrical hole (7), the diameter of the second cylindrical hole (7) is smaller than the upstream end diameter of the first truncated cone hole (8), the upstream end diameter of the second truncated cone hole (9) is equal to the downstream end diameter of the first truncated cone hole (8), and the downstream end diameter of the second truncated cone hole (9) is equal to the diameter of the third cylindrical hole (10).

5. The air jet vortex spinning yarn guide cone according to claim 4, characterized in that: The first truncated cone section (2) is provided with part or all of the first cylindrical hole (6), the second truncated cone section (3) is provided with part or all of the second cylindrical hole (7) and the first truncated cone hole (8), the first cylindrical section (4) is provided with part or all of the second truncated cone hole (9), and the second cylindrical section (5) is provided with part or all of the third cylindrical hole (10).

6. A method for air jet vortex spinning using the air jet vortex spinning cone according to any one of claims 3 to 5, characterized in that: When spinning yarn with a linear density not exceeding 40 tex, the diameter d of the first cylindrical hole (6) and the linear density T of the yarn satisfy the following formula: d=0.655+0.043T-0.0006T 2 , Among them, the diameter d is in mm and the linear density T of the yarn is in tex.

7. The air jet vortex spinning method according to claim 6, characterized in that: Viscose fiber with a main body length of 38 mm is used as raw material, and a jet vortex pure viscose yarn with a linear density T of 21 tex is spun at a nozzle air pressure of 0.58 MPa. The diameter d of the first cylindrical hole (6) and the diameter of the inlet (11) are both 1.3 mm. The cone angle α of the first truncated cone section (2) is set to 17°, and the axial length h1 is 7.9 mm, accounting for 20.8% of the main body length of the spun fiber. The downstream end diameter of the first truncated cone section (2) is 5.36 mm, accounting for 14.1% of the main body length of the spun fiber. The cone angle β of the second truncated cone section (3) is 65°, and the axial length h2 is 7.2 mm, accounting for 18.9% of the main body length of the spun fiber.

8. The air jet vortex spinning method according to claim 6, characterized in that: Combed cotton fiber with a main body length of 33 mm is used as raw material, and jet vortex pure cotton yarn with a linear density T of 32 tex is spun at a nozzle air pressure of 0.63 MPa. The diameter d of the first cylindrical hole (6) and the diameter of the inlet (11) are both 1.4 mm. The cone angle α of the first truncated cone section (2) is set to 14°, and the axial length h1 is 6.5 mm, accounting for 19.7% of the main body length of the spun fiber. The downstream end diameter of the first truncated cone section (2) is 5.05 mm, accounting for 15.3% of the main body length of the spun fiber. The cone angle β of the second truncated cone section (3) is 67°, and the axial length h2 is 6.3 mm, accounting for 19.1% of the main body length of the spun fiber.

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