A braiding tool and method of braiding a preform

Abstract

The application discloses a braiding tool and a preform braiding method, and the tool comprises a braiding outer ring and a braiding inner ring, wherein the diameter of the braiding inner ring is smaller than that of the braiding outer ring; the braiding inner ring is rotatably arranged in the braiding outer ring, and the ring centers of the braiding inner ring and the braiding outer ring coincide; the braiding inner ring comprises a left braiding inner ring and a right braiding inner ring which is detachably connected with the left braiding inner ring. The application solves the problem that the fibers cannot closely adhere to the mandrel at the braiding outer ring when the cross-sectional dimension of the mandrel is small by installing and detaching the braiding inner ring in the braiding outer ring and making the mandrel pass through the braiding inner ring; and the phenomenon that the fibers are unevenly covered at different positions is solved by rotating the braiding inner ring and adjusting the angle between the braiding inner ring and the braiding outer ring.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber preform preparation technology, specifically to a weaving fixture and a method for weaving preforms. Background Technology

[0002] Traditional braiding techniques typically use circular braiding machines to produce tubular products such as hoses, ropes, and cables. However, the new two-dimensional braiding technology, based on traditional braiding techniques, utilizes a seven-axis robotic arm to hold the mandrel and control its movement. Multiple yarns oriented along the preform forming direction are inclined and crossed according to a certain pattern, causing the yarns to intertwine and wrap around the mandrel, thus enabling the preparation of two-dimensional braided preforms with large diameters and complex shapes.

[0003] The axial cross-sectional shape varies considerably. Generally, the cross-section at the propeller handle position is circular or crescent-shaped, and the axial cross-sectional width varies greatly. When using two-dimensional weaving technology for production, in order to ensure that the entire structure can pass smoothly through the outer weaving ring, the size of the outer weaving ring depends on the maximum axial width. When weaving at the minimum axial cross-sectional width, because the outer weaving ring is too large, the fibers cannot tightly adhere to the mandrel at the outer weaving ring. The mandrel needs to be pulled further away from the outer weaving ring, which is not easy to calculate accurately. It is also inconvenient to operate when closing the loop and wastes raw materials. Summary of the Invention

[0004] The purpose of this invention is to provide a weaving method for weaving tooling and prefabricated parts, so as to solve the problem in the prior art that when the cross-sectional size of the mandrel becomes smaller or the cross-sectional size of the mandrel changes to a crescent shape, the fibers cannot be tightly attached to the mandrel or the coverage is uneven.

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0006] In a first aspect, this application discloses a weaving fixture, including a weaving outer ring and a weaving inner ring, wherein the diameter of the weaving inner ring is smaller than the diameter of the weaving outer ring;

[0007] The inner braided ring is rotatably disposed within the outer braided ring, and the centers of the inner braided ring and the outer braided ring coincide.

[0008] The braided inner ring includes a left braided inner ring and a right braided inner ring that is detachably connected to the left braided inner ring.

[0009] Furthermore, the braided outer ring is provided with at least one set of connecting holes, each set of connecting holes including two radial holes symmetrical about the ring center;

[0010] The braided inner ring is connected to the radial holes on the braided outer ring via a screw assembly.

[0011] Furthermore, the screw assembly includes a threaded rod and a nut;

[0012] One end of the threaded rod passes through the radial hole and is fixed to the braided outer ring with a nut, while the other end is connected to the braided inner ring via an anti-torsion screw assembly.

[0013] Furthermore, the woven outer ring is provided with two radial eyelets symmetrical about the ring center;

[0014] The braided inner ring is connected to the radial holes on the braided outer ring via a screw assembly.

[0015] Furthermore, the screw assembly includes a threaded rod and a nut;

[0016] One end of the threaded rod passes through the radial hole and is fixed to the braided outer ring with a nut, while the other end is connected to the connection between the left and right braided inner rings via an anti-torsion screw assembly.

[0017] Furthermore, the left and right braided inner rings have the same shape and size, with a plug at one end and a socket at the other end, and both the plug and the socket have side holes.

[0018] The plug of the left braided inner ring is inserted into the socket of the right braided inner ring and connected to the threaded rod through the anti-torsion screw assembly;

[0019] The plug of the right braided inner ring is inserted into the socket of the left braided inner ring and connected to the threaded rod via the anti-torsion screw assembly.

[0020] Furthermore, the anti-torsion screw assembly includes an anti-torsion threaded rod and an anti-torsion nut;

[0021] Both the plug and the socket are provided with radial holes, and the end of the threaded rod is provided with a connecting hole. The threaded rod passes through the radial holes of the plug and the socket and connects to the inside of the plug.

[0022] The anti-torsion bar threaded rod is connected from the side hole to the connection hole of the threaded rod and fixed by the anti-torsion nut.

[0023] Furthermore, the outer periphery of the braided outer ring is also connected with a plurality of circular mounting feet for connection with a circular braiding machine.

[0024] Secondly, this application discloses a method for weaving prefabricated components, employing the weaving fixture described in any one of the first aspects, the method comprising:

[0025] The diameter of the braided outer ring is determined based on the maximum axial cross-sectional width of the mandrel, and the diameter of the braided inner ring is determined based on the minimum axial cross-sectional width of the mandrel.

[0026] The outer braided ring is fixed on a circular braiding machine, and a detachable inner braided ring is provided inside the outer braided ring. When the inner braided ring is installed inside the outer braided ring, the centers of the outer braided ring and the inner braided ring coincide, and the inner braided ring is rotatable relative to the outer braided ring.

[0027] Start the circular braiding machine and robotic arm, install the braiding inner ring according to the core mold cross-section size, or adjust the angle between the braiding inner ring and the braiding outer ring according to the core mold cross-section shape and size to braid the preform.

[0028] Furthermore, the process of installing a braided inner ring according to the core mold cross-sectional dimensions, or adjusting the angle between the braided inner ring and the braided outer ring according to the core mold cross-sectional shape and dimensions to braid the preform includes:

[0029] When the axial cross-sectional width of the mandrel increases to a preset value, weaving stops, the inner weaving ring is removed from the outer weaving ring, and the robotic arm pulls the mandrel out through the outer weaving ring at a constant speed to continue weaving.

[0030] When the axial cross-sectional width of the mandrel decreases to a preset value, weaving stops. The inner weaving ring is then installed into the outer weaving ring, and the robotic arm pulls the mandrel out through the inner weaving ring at a constant speed to continue weaving.

[0031] When the cross-section of the mandrel is crescent-shaped, the angle between the inner braiding ring and the outer braiding ring is adjusted according to the size of the crescent-shaped cross-section of the mandrel to complete the braiding of the crescent-shaped cross-section segment.

[0032] According to the above technical solution, the present invention has the following effects:

[0033] The braiding inner ring in the braiding fixture of this application includes a detachably connected left braiding inner ring and a right braiding half ring, which realizes the installation and removal of the braiding inner ring in the braiding outer ring. When the cross-sectional size of the mandrel becomes smaller, the mandrel passes through the braiding inner ring, solving the problem that when the perimeter of the mandrel cross-section becomes smaller, the fibers at the braiding outer ring cannot tightly adhere to the mandrel.

[0034] In this application, the inner ring of the weaving fixture is rotatably set inside the outer ring. When weaving to the crescent-shaped mandrel section, the uneven coverage of fibers at different positions can be solved by rotating the inner ring and adjusting the angle between the inner and outer rings. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the woven tooling of the present invention;

[0036] Figure 2 This is a schematic diagram of the braided inner ring structure in this invention;

[0037] Figure 3 This is a flowchart of the weaving method of the present invention.

[0038] The components are: 1. Braided outer ring; 101. Circular ring; 102. Circular ring mounting foot; 2. Braided inner ring; 201. Left braided inner ring; 202. Right braided inner ring; 2011. Side eyelet; 301. Upper screw assembly; 302. Lower screw assembly; 3011. Threaded rod; 3012. Nut; 401. Upper anti-torsion screw assembly; 402. Lower anti-torsion screw assembly. Detailed Implementation

[0039] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0040] It should be noted that in the description of this invention, the terms "front," "rear," "left," "right," "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "front," "rear," "left," "right," "upper," and "lower" used in the description of this invention refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0041] The braiding fixture of this application can be applied to prefabricated parts (such as blades or other prefabricated parts) with large changes in axial cross-sectional shape. By designing a braided outer ring and a braided inner ring that is detachably connected to the braided outer ring, the circumference at different positions of the prefabricated part is matched, which solves the problem that the fibers at the braided outer ring cannot be tightly attached to the mandrel when the circumference of the mandrel cross-section becomes smaller. When the mandrel cross-section is crescent-shaped, the uneven coverage of fibers at different positions is solved by rotating the angle of the braided inner ring relative to the braided outer ring.

[0042] Example 1

[0043] like Figures 1 to 2 As shown, this application provides a knitting fixture, including a knitting outer ring 1 and a knitting inner ring 2, wherein the diameter of the knitting inner ring 2 is smaller than the diameter of the knitting outer ring 1; the knitting inner ring 2 is rotatably disposed inside the knitting outer ring 1, and the centers of the knitting inner ring 2 and the knitting outer ring 1 coincide; the knitting inner ring 2 includes a left knitting inner ring 201 and a right knitting inner ring 202 detachably connected to the left knitting inner ring 201.

[0044] In this application, since the centers of the inner loop 2 and the outer loop 1 coincide, when the inner loop 2 and the outer loop 1 are in the same plane, that is, as shown... Figure 1As shown, the axes of the inner loop 2 and the outer loop 1 coincide at this point. When the inner loop 2 rotates 90°, it becomes perpendicular to the outer loop 1. At this point, the axes of the inner loop 2 and the outer loop 1 are perpendicular in space. This position is the limit of the rotation of the inner loop 2. The inner loop 2 can rotate between 0° and 90° to complete the weaving of a crescent-shaped core segment. The greater the change in the crescent-shaped size, the greater the rotation angle of the inner loop 2.

[0045] In this application, the rotation of the braided inner ring 2 can be achieved by automatic control or by manual control. For example, after the braided inner ring 2 is connected to the braided outer ring 1 by the connector, the angle of the braided inner ring 2 can be changed by rotating the connector. The process of rotating the connector can be done manually or by driving it to rotate through a motor and transmission components.

[0046] This application provides a left braided inner ring 201 and a right braided inner ring 202 that are detachably connected to the left braided inner ring 201. When the two are detached, the braided inner ring 2 can be removed from the braided outer ring 1. When the two are connected, the braided inner ring 2 can be connected in the braided outer ring 1, which facilitates the disassembly and installation of the braided inner ring 2.

[0047] In one embodiment, the braiding fixture includes an outer braiding ring 1 and an inner braiding ring 2. The outer braiding ring 1 includes a circular ring 101 and a circular ring mounting foot 102. The circular ring mounting foot 102 is disposed on the outer periphery of the circular ring 101 to connect the circular ring 101 to a circular braiding machine.

[0048] The ring 101 has two radial holes that are symmetrical about the center of the ring. The radial holes are holes that pass through from the outer side of the outer ring to the inner side of the ring. The direction of the holes is along the radial direction of the ring. The purpose of setting the radial holes is to connect the braided inner ring 2.

[0049] Specifically, the tooling also includes a screw assembly, which includes an upper screw assembly 301 and a lower screw assembly 302. The upper screw assembly 301 and the lower screw assembly 302 have the same structure, each including a threaded rod 3011 and two nuts 3012. The far end of the threaded rod 3011 (the end away from the ring center) passes through the radial holes of the ring 101 through the two nuts and is fixed to the ring 101. Its proximal end (the end closer to the ring center) is used for connecting the braided inner ring 2.

[0050] Specifically, the threaded rod 3011 has a hole at its proximal end, which is connected to the anti-torsion threaded rod assembly and the braided inner ring 2. The upper anti-torsion threaded rod assembly 401 and the lower anti-torsion threaded rod assembly 402 have the same structure, each including an anti-torsion threaded rod and an anti-torsion nut.

[0051] like Figure 2As shown, the braided inner ring 2 is a hollow ring comprising a left braided inner ring 201 and a right braided inner ring 202. Both the left and right braided inner rings have plugs and sockets, and are approximately 50mm long. The right braided inner ring 202 and the left braided inner ring 201 are connected as a whole through the plugs and sockets.

[0052] Furthermore, the plugs and sockets of the left braided inner ring 201 and the right braided inner ring 202 are also provided with radial holes, allowing the upper threaded rod 3011 to pass sequentially through the outer side of the left braided outer ring, the outer side of the right braided outer ring, the inner side of the right braided outer ring, and finally abut against the inner side of the left braided outer ring. Similarly, the lower threaded rod 3011 can pass sequentially through the outer side of the right braided outer ring 202, the outer side of the left braided inner ring 201, the inner side of the left braided inner ring 201, and finally abut against the inner side of the right braided inner ring 202.

[0053] The plugs and sockets of the left braided inner ring 201 and the right braided inner ring 202 are also provided with side holes. The anti-torsion threaded rods of the upper anti-torsion screw assembly 401 and the lower anti-torsion screw assembly 402 are inserted into the side holes and fixed by the anti-torsion nut.

[0054] The above solution can achieve the installation and fixation of the braided inner ring 2 through the screw assembly and the anti-torsion screw assembly, and the rotation of the braided inner ring 2 relative to the braided outer ring can be achieved by rotating the screw assembly.

[0055] In some other embodiments, an additional set of radial holes can be added to the braided outer ring 1, which corresponds to four screw assemblies. The braided inner ring 2 and the braided outer ring 1 are connected by the four screw assemblies. This allows for a better connection of the braided inner ring 2. However, when rotating the braided inner ring, the two additional screw assemblies need to be removed.

[0056] The braiding inner ring in the braiding fixture of this application includes a detachably connected left braiding inner ring and a right braiding half ring, which realizes the installation and removal of the braiding inner ring in the braiding outer ring. When the cross-sectional size of the mandrel becomes smaller, the mandrel passes through the braiding inner ring, solving the problem that when the perimeter of the mandrel cross-section becomes smaller, the fibers at the braiding outer ring cannot tightly adhere to the mandrel.

[0057] In this application, the inner ring of the weaving fixture is rotatably set inside the outer ring. When weaving to the crescent-shaped mandrel section, the uneven coverage of fibers at different positions can be solved by rotating the inner ring and adjusting the angle between the inner and outer rings.

[0058] The tooling structure of this application is simple and easy to operate. Without increasing production costs too much, it allows the original equipment to be used for the production of prefabricated parts of more shapes and improves the product quality of the prefabricated parts.

[0059] Example 2

[0060] Based on the weaving fixture provided in Embodiment 1, this embodiment also provides a weaving method for prefabricated components, such as... Figure 3 As shown, the method includes the following steps:

[0061] Step 1: Determine the diameter of the braided outer ring 1 based on the maximum axial cross-sectional width of the mandrel, and determine the diameter of the braided inner ring 2 based on the minimum axial cross-sectional width of the mandrel.

[0062] In this step, the diameter of the outer braided ring 1 must be greater than the maximum axial cross-sectional width of the mandrel, and the diameter of the inner braided ring 2 must be greater than the minimum axial cross-sectional width of the mandrel, so that the mandrel can pass smoothly through the outer braided ring 1 and the inner braided ring 2.

[0063] Step 2: Fix the outer braided ring 1 on the circular braiding machine, and set a detachable inner braided ring 2 inside the outer braided ring 1. When the inner braided ring 2 is installed inside the outer braided ring 1, the centers of the outer braided ring 1 and the inner braided ring 2 coincide, and the inner braided ring 2 can rotate relative to the outer braided ring 1.

[0064] Step 3: Start the circular braiding machine and robotic arm, install the braiding inner ring 2 according to the core mold cross-section size, or adjust the angle of the braiding inner ring 2 relative to the braiding outer ring 1 according to the core mold cross-section shape and size to braid the preform.

[0065] In step 3, the process of installing the braided inner ring 2 according to the core mold cross-sectional dimensions, or adjusting the angle of the braided inner ring 2 relative to the braided outer ring 1 according to the core mold cross-sectional shape and dimensions to braid the preform includes:

[0066] When the axial cross-sectional width of the mandrel decreases to the preset value, weaving stops. The inner weaving ring 2 is installed into the outer weaving ring 1, and the robotic arm pulls the mandrel out through the inner weaving ring 2 at a constant speed to continue weaving.

[0067] When the cross-section of the mandrel is crescent-shaped, adjust the angle between the inner weaving ring 2 and the outer weaving ring 1 according to the size of the crescent-shaped cross-section of the mandrel to complete the weaving of the crescent-shaped cross-section segment.

[0068] In this step, as the size of the crescent-shaped cross-section increases, the angle between the inner braided ring 2 and the outer braided ring 1 is increased.

[0069] Step 3 may also include stopping weaving when the axial cross-sectional width of the mandrel increases to a preset value, removing the inner weaving ring 2 from the outer weaving ring 1, and having the robotic arm pull the mandrel out through the outer weaving ring 1 at a uniform speed to continue weaving.

[0070] The weaving method will be explained in detail below using the example of a woven propeller prefabricated component.

[0071] Step 1: Determine the diameter of the outer braided ring 101 based on the maximum axial cross-sectional width of the blade core mold, and determine the diameter of the inner braided ring 2 based on the minimum axial cross-sectional width of the blade core mold.

[0072] Step 2: Install the outer braided ring 1 onto the circular braiding machine using the ring mounting foot 102.

[0073] Step 3: After the seven-axis robotic arm fixes the core mold propeller root and the fiber together, the seven-axis robotic arm pulls the core mold out at a uniform speed and passes it through the inner side of the braided outer ring 1. The circular braiding machine simultaneously braids the fiber to cover the core mold. The braiding stops when the minimum axial cross-sectional width of the propeller core mold is reached, and the seven-axis robotic arm stops moving.

[0074] Step 4: Manually press the fibers inside the braided ring 101 to adhere to the mandrel. Align the left and right braided inner rings to form a whole braided inner ring 2. Place the fibers inside the ring and adjust the position of the left and right braided half-rings so that their upper and lower radial holes are aligned with the upper and lower radial holes of the braided outer ring 1 to form a straight line. Pass the upper screw assembly 301 and the lower screw assembly 302 through the upper and lower radial holes of the braided outer ring 1, insert them into the holes of the left and right braided half-rings and press them against the inner side of the left and right braided inner rings. Tighten the two nuts 3012 to fix them. The inner braided ring 2 is positioned at the center of the outer braided ring 1. The upper anti-torsion threaded rod 401 is passed sequentially through the front side of the left braided inner ring 201, the front side of the right braided inner ring 202, the hole of the upper threaded rod 3011, and the rear side of the right braided inner ring 202, finally abutting against the interior of the rear side of the left braided inner ring 201. The anti-torsion nut is tightened. The lower anti-torsion threaded rod 402 is then passed sequentially through the front side of the right braided inner ring 202, the front side of the left braided inner ring 201, the hole of the lower threaded rod 3011, and the rear side of the left braided inner ring 201, finally abutting against the interior of the rear side of the right braided inner ring 202. The anti-torsion nut is tightened to fix the left and right braided half-rings so that they cannot rotate. The circular braiding machine is started normally, and the seven-axis robotic arm pulls the mandrel out at a uniform speed, passing it through the inner side of the braided inner ring 2. The fiber braiding covers the mandrel, completing the braiding at the minimum axial section width of the blade mandrel.

[0075] Step 5: When the cross-sectional area of ​​the braided core mold is at the crescent-shaped position, the anti-torsion screw assembly can be removed, the screw assembly loosened, the braided inner ring 2 rotated, the angle of the braided inner ring 2 relative to the braided outer ring adjusted, and then the screw assembly tightened again to fix the position of the braided inner ring 2. Insert the upper and lower anti-torsion threaded rods and tighten the nuts to fix the braided inner ring 2 so that its angle cannot be rotated. The circular braiding machine is started normally, and the seven-axis robotic arm pulls the core mold out at a uniform speed through the inside of the left and right braided half rings 2. The fiber braiding covers the core mold to complete the braiding of the crescent-shaped cross-section.

[0076] This application can match the circumference at different positions of the blade, solving the problem that the fibers at the braided ring cannot tightly adhere to the mandrel when the circumference of the mandrel cross section becomes smaller; it can also solve the problem of uneven fiber coverage at different positions when the cross section of the braided mandrel is crescent-shaped.

[0077] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A method for weaving precast components, characterized in that, A type of woven workwear is adopted; The braiding fixture includes a braided outer ring (1) and a braided inner ring (2), wherein the diameter of the braided inner ring (2) is smaller than the diameter of the braided outer ring (1); The inner braided ring (2) is rotatably disposed within the outer braided ring (1), and the centers of the inner braided ring (2) and the outer braided ring (1) coincide. The braided inner ring (2) includes a left braided inner ring (201) and a right braided inner ring (202) detachably connected to the left braided inner ring (201). The weaving method includes: The diameter of the braided outer ring (1) is determined based on the maximum axial cross-sectional width of the mandrel, and the diameter of the braided inner ring (2) is determined based on the minimum axial cross-sectional width of the mandrel; The outer braided ring (1) is fixed on a circular braiding machine, and a detachable inner braided ring (2) is provided inside the outer braided ring (1). When the inner braided ring (2) is installed inside the outer braided ring (1), the centers of the outer braided ring (1) and the inner braided ring (2) coincide, and the inner braided ring (2) is rotatable relative to the outer braided ring (1). Start the circular braiding machine and robotic arm, install the braiding inner ring (2) according to the core mold cross-section size, or adjust the angle of the braiding inner ring (2) relative to the braiding outer ring (1) according to the core mold cross-section shape and size to braid the preform; The step of installing the braided inner ring (2) according to the cross-sectional dimensions of the mandrel or adjusting the angle of the braided inner ring (2) relative to the braided outer ring (1) according to the cross-sectional shape and dimensions of the mandrel to braid the preform includes: When the axial cross-sectional width of the mandrel increases to a preset value, weaving stops, the inner weaving ring (2) is removed from the outer weaving ring (1), and the robotic arm pulls the mandrel out through the outer weaving ring (1) at a constant speed to continue weaving; When the axial cross-sectional width of the mandrel decreases to a preset value, weaving stops. The inner weaving ring (2) is installed into the outer weaving ring (1), and the robotic arm pulls the mandrel out through the inner weaving ring (2) at a constant speed to continue weaving. When the cross section of the mandrel is crescent-shaped, the angle of the inner weaving ring (2) relative to the outer weaving ring (1) is adjusted according to the size of the crescent-shaped cross section of the mandrel to complete the weaving of the crescent-shaped cross section.

2. The weaving method according to claim 1, characterized in that, The braided outer ring (1) is provided with at least one set of connecting holes, each set of connecting holes including two radial holes symmetrical about the center of the ring; The braided inner ring (2) is connected to the radial holes on the braided outer ring (1) via a screw assembly.

3. The weaving method according to claim 2, characterized in that, The screw assembly includes a threaded rod (3011) and a nut (3012). One end of the threaded rod (3011) is fixed to the braided outer ring (1) by passing through the radial hole and by a nut (3012), and the other end is connected to the braided inner ring (2) by an anti-torsion screw assembly.

4. The weaving method according to claim 1, characterized in that, The braided outer ring (1) is provided with two radial holes that are symmetrical about the center of the ring; The braided inner ring (2) is connected to the radial holes on the braided outer ring (1) via a screw assembly.

5. The weaving method according to claim 4, characterized in that, The screw assembly includes a threaded rod (3011) and a nut (3012). One end of the threaded rod (3011) is fixed to the braided outer ring (1) by passing through the radial hole and by a nut (3012), and the other end is connected to the connection between the left braided inner ring (201) and the right braided inner ring (202) by an anti-torsion screw assembly.

6. The weaving method according to claim 3 or 5, characterized in that, The left braided inner ring (201) and the right braided inner ring (202) have the same shape and size, with a plug at one end and a socket at the other end, and side holes (2011) at both the plug and the socket. The plug of the left braided inner ring (201) is inserted into the socket of the right braided inner ring (202) and connected to the threaded rod (3011) through the anti-torsion screw assembly; The plug of the right braided inner ring (202) is inserted into the socket of the left braided inner ring (201) and connected to the threaded rod (3011) through the anti-torsion screw assembly.

7. The weaving method according to claim 6, characterized in that, The anti-torsion screw assembly includes an anti-torsion threaded rod and an anti-torsion nut; Both the plug and the socket are provided with radial holes, and the end of the threaded rod (3011) is provided with a connecting hole. The threaded rod (3011) passes through the radial holes of the plug and the socket and connects to the inside of the plug. The anti-torsion rod threaded rod is connected from the side hole (2011) to the connection hole of the threaded rod (3011) and fixed by the anti-torsion nut.

8. The weaving method according to claim 1, characterized in that, The outer periphery of the braided outer ring (1) is also connected to a plurality of circular ring mounting feet (102) for connection with a circular braiding machine.

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