Three-dimensional braided fabric with one end sealed and production process

Abstract

The present invention provides a three-dimensional braided fabric with a sealed end and a production process method, which belongs to the field of three-dimensional braiding and is used to solve the technical problem in the prior art that the existing braiding process cannot weave a braided fabric with a sealed structure at one end. One end of the three-dimensional braided fabric is a sealed structure that is woven and formed integrally with the side wall; the process method for producing the three-dimensional braided fabric comprises the following steps: the winding spindles arranged on the inner circumference of the three-dimensional braiding machine are numbered 1 to 2N in sequence, and the yarn of the i-th winding spindle is connected with the yarn of the i+N-th winding spindle; the N connected yarns are centered and fixed; the core mold is installed and the three-dimensional braiding machine is started to start weaving until the three-dimensional braided fabric is woven. This application realizes the weaving of a three-dimensional braided fabric with a sealed end by connecting the yarn of the i-th winding spindle of the three-dimensional braiding machine with the yarn of the i+N-th winding spindle, and centering and fixing the N yarns, thereby expanding the application field of three-dimensional braiding.

Description

Technical Field

[0001] The invention belongs to the field of three-dimensional braiding, and in particular relates to a three-dimensional braided fabric with one end sealed and a production process method. Background Art

[0002] Three-dimensional woven composite materials are a type of textile structural composite materials. Compared with ordinary laminated composite materials, three-dimensional woven composite materials have higher impact damage tolerance and fracture toughness. Three-dimensional weaving technology can design the number of fibers according to actual needs, weave complex-shaped parts as a whole, and complete assemblies in one go, reducing the amount of secondary processing, such as circular, square, conical, and various shapes of gradual and transitional weaving, so it is economical, low-cost, and has a short manufacturing cycle. In addition, three-dimensional woven composite materials can be applied to the weaving of various complex geometric shapes, with high stability and integrity, strong designability, and can meet certain specific engineering needs by changing parameters such as weaving methods, weaving angles, and yarn density.

[0003] However, most of the currently woven composite materials are open at both ends, such as round tubes, square tubes and other tube-like parts. With the continuous expansion of the application fields of three-dimensional braided fabrics, higher requirements are placed on the strength and toughness of three-dimensional braided fabrics. The strength and toughness of three-dimensional braided fabrics with one end sealed are greatly improved compared with the existing braided fabrics with both ends open, but the existing braiding production processes cannot achieve the weaving of three-dimensional braided fabrics with one end sealed. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a three-dimensional braided fabric with a sealed end and a production process method, so as to solve the technical problem that the existing braiding process in the prior art cannot weave a braided fabric with a sealed structure at one end.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a process for producing a three-dimensional braided fabric with one end sealed, and the specific steps are as follows:

[0006] S1: Numbering 2N winding spindles arranged on the inner circumference of the three-dimensional braiding machine from 1 to 2N in sequence, connecting the yarn of the i-th winding spindle with the yarn of the i+N-th winding spindle, where: 1≤i≤N;

[0007] S2: The middle positions of the N connected yarns are positioned at the center position of the three-dimensional braiding machine and fixed;

[0008] S3: Install the core mold and start the three-dimensional braiding machine to start weaving until the three-dimensional braided fabric is completed.

[0009] As an optional solution, the specific steps of positioning and fixing the middle positions of the N connected yarns at the center position of the three-dimensional knitting machine in step S2 are:

[0010] S2-1: Install the centering component on the installation platform on one side of the 3D braiding machine so that the center axis of the centering component coincides with the center axis of the 3D braiding machine;

[0011] S2-2: Push the centering component to move toward the side close to the three-dimensional knitting machine, divide the yarn into M areas and center them; where: 2≤M≤N;

[0012] S2-3: spraying adhesive to fix the centers of the N yarns centered in step S2-2;

[0013] S2-4: Push the centering assembly back to the initial position.

[0014] As an optional solution, in step S2-2, the specific steps of pushing the centering component to move toward the side close to the three-dimensional knitting machine, dividing the yarn into M areas and centering the yarn are as follows:

[0015] S2-2-1: Push the circular mounting plate of the centering assembly to move toward the side close to the three-dimensional braiding machine, and the front ends of M positioning columns arranged on the circular mounting plate in an equiangular array along the central axis of the circular mounting plate pass through the three-dimensional braiding machine, and the M positioning columns divide the yarn into M areas, where: 2≤M≤N;

[0016] S2-2-2: Push M positioning columns to slide along the radial line on the upper end surface of the center mounting plate, so that all yarns pass through the center axis of the centering assembly;

[0017] S2-2-3: Push the positioning plate of the centering assembly to move toward the side close to the yarn. The positioning plate pushes N yarns to the same plane to complete the centering of the yarn.

[0018] As an optional solution, the specific steps of spraying adhesive in step S2-3 to fix the center of the N yarns after centering in step S2-2 are:

[0019] S2-3-1: Push the positioning cylinder of the centering assembly to move toward the side close to the yarn, so that the M groups of yarns are respectively clamped into the M positioning grooves at the front end of the positioning cylinder;

[0020] S2-3-2: Spray adhesive from the middle of the positioning tube to fix the center of the N yarns centered in step S2-2.

[0021] As an optional solution, in step S3, the core mold is installed and the three-dimensional braiding machine is started to start braiding until the three-dimensional braided fabric is braided. The specific steps are:

[0022] S3-1: Install the core mold assembly on the installation platform on the other side of the 3D braiding machine so that the central axis of the core mold assembly coincides with the central axis of the 3D braiding machine;

[0023] S3-2: starting the three-dimensional braiding machine to start weaving the sealing structure until the weaving of the sealing structure at one end of the three-dimensional braided fabric is completed;

[0024] S3-3: Push the core mold of the core mold assembly to move toward the side close to the three-dimensional braiding machine, and the core mold pushes the sealing structure to move. The three-dimensional braiding machine continues to weave the side wall of the three-dimensional braided fabric until the side wall of the three-dimensional braided fabric reaches a predetermined length and the weaving is completed.

[0025] As an optional solution, when the centering assembly is installed on the installation platform on one side of the three-dimensional braiding machine, the central axis of the circular installation plate and the central axis of the positioning cylinder both coincide with the central axis of the three-dimensional braiding machine.

[0026] A three-dimensional braided fabric with one end sealed is manufactured by the above-mentioned process method for producing a three-dimensional braided fabric with one end sealed. One end of the three-dimensional braided fabric is a sealing structure, and the sealing structure is integrally woven with the side wall of the three-dimensional braided fabric.

[0027] As described above, the three-dimensional braided fabric with one end sealed and the production process of the present invention have at least the following beneficial effects:

[0028] 1. The present application realizes the weaving of a three-dimensional braided fabric with one end sealed by connecting the yarn of the i-th winding spindle of a three-dimensional braiding machine with the yarn of the i+N-th winding spindle, and centering and bonding N yarns through a centering component, thereby expanding the application field of three-dimensional weaving and providing high structural strength of the braided fabric.

[0029] 2. The present application centers N yarns by sliding the positioning column radially, pushes the N yarns to the same plane through the positioning plate, places the yarn card into the positioning groove, and fixes the centers of the N yarns with adhesive, thereby realizing rapid centering and fixation of the N yarns, facilitating subsequent weaving of the three-dimensional weaving machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A flow chart showing a process for producing a three-dimensional braided fabric of the present invention;

[0031] Figure 2 Shown is a schematic structural diagram of a centering assembly of the present invention;

[0032] Figure 3 Shown is a cross-sectional view of a centering assembly of the present invention;

[0033] Figure 4 Shown is a partial structural schematic diagram of the centering component of the present invention.

[0034] In the figure: 201-center mounting plate; 202-positioning plate; 203-spring; 204-guide rod; 205-positioning column; 206-electric cylinder; 207-guide rail module; 208-positioning cylinder; 209-positioning groove; 210-delivery pipeline; 211-adhesive nozzle; 2011-mounting hole; 2021-long hole; 2022-avoidance hole. DETAILED DESCRIPTION

[0035] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0036] See also Figures 1 to 4 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0037] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0038] Embodiment 1:

[0039] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 , a process for producing a three-dimensional braided fabric with one end sealed, the specific steps are:

[0040] S1: Number the 2N winding spindles arranged on the inner circumference of the three-dimensional braiding machine from 1 to 2N in sequence, and connect the yarn of the i-th winding spindle with the yarn of the i+N-th winding spindle, where: 1≤i≤N.

[0041] In this embodiment, the three-dimensional braiding machine has 176 winding spindles arranged along the inner circumference. When it is necessary to weave a three-dimensional braided fabric with one end sealed, the yarn of the first winding spindle is connected to the yarn of the 89th winding spindle, and so on, until the yarn of the 88th winding spindle is connected to the yarn of the 176th winding spindle.

[0042] S2: The middle positions of the N connected yarns are positioned at the center of the three-dimensional knitting machine and fixed; the specific steps are:

[0043] S2-1: Install the centering component on the installation platform on one side of the 3D braiding machine so that the center axis of the centering component coincides with the center axis of the 3D braiding machine.

[0044] In this embodiment, when the centering assembly is installed on the installation platform on one side of the 3D knitting machine, it is necessary to ensure that the central axis of the circular installation plate and the central axis of the positioning cylinder 208 coincide with the central axis of the 3D knitting machine.

[0045] S2-2: Push the centering component to move toward the side close to the three-dimensional knitting machine, divide the yarn into M areas and center them; where: 2≤M≤N; the specific steps are:

[0046] S2-2-1: Push the circular mounting plate of the centering assembly to move toward the side close to the three-dimensional braiding machine, and the front ends of M positioning columns arranged on the circular mounting plate in an equiangular array along the central axis of the circular mounting plate pass through the three-dimensional braiding machine, and the M positioning columns divide the yarn into M areas, where: 2≤M≤N;

[0047] S2-2-2: Push M positioning columns to slide along the radial line on the upper end surface of the center mounting plate, so that all yarns pass through the center axis of the centering assembly;

[0048] S2-2-3: Push the positioning plate of the centering assembly to move toward the side close to the yarn. The positioning plate pushes N yarns to the same plane to complete the centering of the yarn.

[0049] In this example, see Figure 2 , Figure 3 and Figure 4 The centering assembly includes a center mounting plate 201, a positioning plate 202, a spring 203, a guide rod 204, a positioning column 205, an electric cylinder 206 and a guide rail module 207; the positioning plate 202 is arranged in parallel with the center mounting plate 201, and the center axes of the positioning plate 202 and the center mounting plate 201 coincide with the axis of the three-dimensional knitting machine 1, the center mounting plate 201 and the positioning plate 202 are connected by a spring 203, one end of the guide rod 204 is fixed to the end face of the positioning plate 202 close to the center mounting plate 201, the other end of the guide rod 204 is slidably guided with the center mounting plate 201, and the spring 203 is sleeved on the outer wall of the guide rod 204;

[0050] M groups of guide rail modules 207 and electric cylinders 206 are installed on the center mounting plate 201 in an equiangular array along the center axis of the center mounting plate 201. One end of M positioning columns 205 is installed on the slider of the guide rail module 207. The axis of the positioning column 205 is perpendicular to the end face of the center mounting plate 201. The telescopic end of the electric cylinder 206 is fixedly connected to the slider of the guide rail module 207. The positioning plate 202 is provided with a long hole 2021 to prevent the positioning column 205 from sliding.

[0051] In this embodiment, the value of M is 6. During production, the centering component is installed on the mounting frame, and the centering component is pushed horizontally by a pneumatic cylinder or an electric cylinder to move it closer to or away from the three-dimensional knitting machine. In step S2-2-1, the positioning column 205 at the front end is passed through the yarn of the three-dimensional knitting machine through the center mounting plate 201; in step S2-2-2, the positioning column 205 is pushed by the electric cylinder 206 to move close to the center axis of the three-dimensional knitting machine; in step S2-2-3, the centering component is continued to be pushed forward, and the positioning plate 202 contacts the yarn, pushing the center position of the yarn to the same plane.

[0052] S2-3: Spraying adhesive to fix the center of the N yarns after centering in step S2-2; the specific steps are:

[0053] S2-3-1: Push the positioning cylinder of the centering assembly to move toward the side close to the yarn, so that the M groups of yarns are respectively clamped into the M positioning grooves at the front end of the positioning cylinder;

[0054] S2-3-2: Spray adhesive from the middle of the positioning cylinder 208 to fix the center of the N yarns centered in step S2-2.

[0055] In this example, see Figure 2 , Figure 3 and Figure 4 The centering component also includes a positioning cylinder 208, a mounting hole 2011 is provided at the center of the center mounting plate 201, and a positioning cylinder 215 is installed in the mounting hole 2011. The side wall of the positioning cylinder 208 close to the positioning plate 202 is provided with M positioning grooves 209 arranged in an array at equal angles along the center axis of the positioning cylinder 208; an avoidance hole 2022 for avoiding the positioning cylinder 208 is provided at the center position of the positioning plate 202, and when the spring 203 is in a free state, the end of the positioning cylinder 208 close to the positioning plate 202 does not extend out of the end surface of the positioning plate 202 away from the side of the center mounting plate 201; a delivery pipeline 210 for delivering adhesive is installed in the positioning cylinder 208, and an adhesive nozzle 211 is installed at one end of the delivery pipeline 210 close to the positioning plate 202, and the other end of the delivery pipeline 210 is connected to the adhesive pumping component.

[0056] In this embodiment, the center position of the center mounting plate 201 is assumed to be the coordinate origin, the number of positioning grooves 209 is 6 groups, the positioning posts 205 are rotated 60° from the positive direction of X, and the positioning grooves 209 are rotated 60° from 30°. Through the above settings, the yarn between the two positioning posts 205 in step S2-3-1 is just located at the front end of the positioning groove 209, which is convenient for the positioning groove 209 to clamp the yarn.

[0057] S2-4: Push the centering assembly back to the initial position.

[0058] S3: Install the core mold and start the 3D braiding machine to start braiding until the 3D braided fabric is braided. The specific steps are as follows:

[0059] S3-1: Install the core mold assembly on the installation platform on the other side of the 3D braiding machine so that the central axis of the core mold assembly coincides with the central axis of the 3D braiding machine;

[0060] S3-2: starting the three-dimensional braiding machine to start weaving the sealing structure until the weaving of the sealing structure at one end of the three-dimensional braided fabric is completed;

[0061] S3-3: Push the core mold of the core mold assembly to move toward the side close to the three-dimensional braiding machine, and the core mold pushes the sealing structure to move. The three-dimensional braiding machine continues to weave the side wall of the three-dimensional braided fabric until the side wall of the three-dimensional braided fabric reaches a predetermined length and the weaving is completed.

[0062] To summarize, the present invention connects the yarn of the i-th winding spindle of the three-dimensional braiding machine with the yarn of the i+N-th winding spindle and performs centering bonding on the N yarns, thereby achieving the weaving of a three-dimensional braided fabric with one end sealed, thereby expanding the application field of three-dimensional weaving and providing high structural strength to the braided fabric.

[0063] Embodiment 2:

[0064] A three-dimensional braided fabric with one end sealed is manufactured by the above-mentioned process method for producing a three-dimensional braided fabric with one end sealed. One end of the three-dimensional braided fabric is a sealing structure, and the sealing structure is integrally woven with the side wall of the three-dimensional braided fabric.

[0065] In this embodiment, by setting one end of the three-dimensional braided fabric as a sealing structure, the strength and toughness of the three-dimensional braided fabric are improved.

[0066] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A process for producing a three-dimensional braided fabric with one end sealed, characterized in that: The specific steps are: S1: Numbering 2N winding spindles arranged on the inner circumference of the three-dimensional braiding machine from 1 to 2N in sequence, connecting the yarn of the i-th winding spindle with the yarn of the i+N-th winding spindle, where: 1≤i≤N; S2: The middle positions of the N connected yarns are positioned at the center position of the three-dimensional braiding machine and fixed; S3: installing the core mold and starting the three-dimensional braiding machine to start braiding until the three-dimensional braided fabric is braided; The specific steps of positioning and fixing the middle positions of the N connected yarns at the center position of the three-dimensional knitting machine in step S2 are: S2-1: Install the centering component on the installation platform on one side of the 3D braiding machine so that the center axis of the centering component coincides with the center axis of the 3D braiding machine; S2-2: Push the centering component to move toward the side close to the three-dimensional braiding machine, divide the yarn into M areas and center them; where: 2≤M≤N; S2-3: spraying adhesive to fix the centers of the N yarns centered in step S2-2; S2-4: Push the centering assembly back to the initial position; In step S2-2, the specific steps of pushing the centering component to move toward the side close to the three-dimensional knitting machine, dividing the yarn into M areas and centering the yarn are as follows: S2-2-1: Push the circular mounting plate of the centering assembly to move toward the side close to the three-dimensional braiding machine, and the front ends of M positioning columns arranged on the circular mounting plate in an equiangular array along the central axis of the circular mounting plate pass through the three-dimensional braiding machine, and the M positioning columns divide the yarn into M areas, where: 2≤M≤N; S2-2-2: Push M positioning columns to slide along the radial line on the upper end surface of the center mounting plate, so that all yarns pass through the center axis of the centering assembly; S2-2-3: Push the positioning plate of the centering assembly to move toward the side close to the yarn. The positioning plate pushes N yarns to the same plane to complete the centering of the yarn.

2. The process for producing a three-dimensional braided fabric with one end sealed as claimed in claim 1, characterized in that: The specific steps of spraying adhesive in step S2-3 to fix the center of the N yarns after centering in step S2-2 are: S2-3-1: Push the positioning cylinder of the centering assembly to move toward the side close to the yarn, so that the M groups of yarns are respectively clamped into the M positioning grooves at the front end of the positioning cylinder; S2-3-2: Spray adhesive from the middle of the positioning tube to fix the center of the N yarns centered in step S2-2.

3. The process for producing a three-dimensional braided fabric with one end sealed as claimed in claim 1, characterized in that: In step S3, the core mold is installed and the three-dimensional braiding machine is started to start braiding until the three-dimensional braided fabric is braided. The specific steps are as follows: S3-1: Install the core mold assembly on the installation platform on the other side of the 3D braiding machine so that the central axis of the core mold assembly coincides with the central axis of the 3D braiding machine; S3-2: starting the three-dimensional braiding machine to start weaving the sealing structure until the weaving of the sealing structure at one end of the three-dimensional braided fabric is completed; S3-3: Push the core mold of the core mold assembly to move toward the side close to the three-dimensional braiding machine, and the core mold pushes the sealing structure to move. The three-dimensional braiding machine continues to weave the side wall of the three-dimensional braided fabric until the side wall of the three-dimensional braided fabric reaches a predetermined length and the weaving is completed.

4. The process for producing a three-dimensional braided fabric with one end sealed as claimed in claim 2, characterized in that: When the centering assembly is mounted on the mounting platform on one side of the three-dimensional braiding machine, the central axis of the circular mounting plate and the central axis of the positioning cylinder coincide with the central axis of the three-dimensional braiding machine.

5. A three-dimensional braided fabric with one end sealed, characterized in that: A three-dimensional braided fabric is manufactured by the process for producing a three-dimensional braided fabric with one end sealed as described in any one of claims 1 to 4, wherein one end of the three-dimensional braided fabric is a sealing structure, and the sealing structure is integrally woven with the side wall of the three-dimensional braided fabric.

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