Preparation method of circular structure three-dimensional spacer fabric

Abstract

The present invention belongs to the field of textile technology and relates to a method for preparing a circular three-dimensional spacer fabric. Specifically, the method comprises the following steps: a group of yarns a is used to weave an outer braided tube, and a group of yarns b is used to weave an inner braided tube. The outer braided tube is sheathed over the inner braided tube, and the inner diameter of the outer braided tube is larger than the outer diameter of the inner braided tube. During the weaving process, multiple spacer yarns are inserted between the interweaving points formed by yarns a and yarns b. The spacer yarns are repeatedly inserted as the weaving process proceeds. Upon completion of the weaving process, the circular three-dimensional spacer fabric is obtained. The method of the present invention is simple, can efficiently produce a circular three-dimensional spacer fabric, and the gauge of the circular three-dimensional spacer fabric is easily adjustable.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles and relates to a method for preparing a circular structured three-dimensional spacer fabric. Background Art

[0002] Circular three-dimensional spacer fabrics are textile materials with a specific shape and structure. They contain a spacer layer, which allows the fabric to maintain a certain thickness while also offering excellent breathability and elasticity. These fabrics have a wide range of applications, including as wrapping for sports equipment, supporting structures for medical devices, and sound insulation for automotive interiors. Circular three-dimensional spacer fabrics are highly sought after in the market due to their stable support and comfortable user experience.

[0003] However, spacer fabrics produced by traditional weaving technology are usually planar structures and cannot meet the needs of applications requiring circular structures.

[0004] To address the limitations of traditional weaving technology, patent application CN1431351A and the literature (Research on the Weaving Process and Performance of Circular Weft-knitted Spacer Fabrics [D]. Donghua University, 2007) both successfully produced circular three-dimensional spacer fabrics using circular knitting machines. However, this preparation method requires strict control of various parameters of the circular knitting machine during the weaving process, such as needle gauge and yarn tension, to ensure fabric quality and performance, and the production process is relatively complex.

[0005] Therefore, it is necessary to develop a method that can efficiently prepare circular structured three-dimensional spacer fabrics. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems existing in the prior art and provide a method for preparing a circular structured three-dimensional spacer fabric.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A method for preparing a circular structured three-dimensional spacer fabric comprises the following steps: using a group of yarns a to weave an outer braided tube, and simultaneously using a group of yarns b to weave an inner braided tube; the outer braided tube is sleeved over the inner braided tube, and the inner diameter of the outer braided tube is larger than the outer diameter of the inner braided tube; during the weaving process, multiple spacer wires are inserted between the interweaving points formed by yarns a and yarns b, and the spacer wires are repeatedly inserted as the weaving process proceeds; and upon completion of the weaving, the circular structured three-dimensional spacer fabric is obtained.

[0009] As the preferred technical solution:

[0010] According to the method for preparing a circular structure three-dimensional spacer fabric, a group of yarn carriers a distributed in an annular manner are controlled to rotate around a vertical virtual axis to drive a group of yarns a to be interwoven, and a group of yarn carriers b distributed in an annular manner and located inside the yarn carriers a are synchronously controlled to rotate around the virtual axis to drive a group of yarns b to be interwoven;

[0011] When yarn carrier a and yarn carrier b rotate one circle around the virtual axis, yarn a completes multiple interweaving to form m interweaving points a, and yarn b completes multiple interweaving to form m interweaving points b. The m interweaving points a are arranged at intervals from the m interweaving points b, where m is a positive integer.

[0012] n interweaving points a and n interweaving points b are selected from m interweaving points a and m interweaving points b respectively to form multiple pairs of interweaving points a and interweaving points b. For each pair of interweaving points a and interweaving points b, a spacer wire is inserted between the two when they are first formed, and then weaving is continued. When at least one new pair of interweaving points a and interweaving points b is formed directly below the pair of interweaving points a and interweaving points b, the spacer wire is inserted between the latest pair of interweaving points a and interweaving points b, and the process is repeated until the weaving is completed.

[0013] As described above, in a method for preparing a circular structure three-dimensional spacer fabric, n interweaving points a are numbered from 1 to n in the order of appearance, and n interweaving points b are numbered from 1 to n in the order of appearance. The i-th interweaving point a and the i-th interweaving point b form a pair of interweaving points a and b for inserting spacer yarns, i=1,…,n, so that parallel spacer yarns can be formed.

[0014] According to the preparation method of a circular structure three-dimensional spacer fabric as described above, n interweaving points a are numbered from 1 to n in the order of appearance, and n interweaving points b are numbered from 1 to n in the order of appearance. The j+1th interweaving point a and the jth interweaving point b form a pair of interweaving points a and b for inserting spacer wires, and at the same time, they form a pair of interweaving points a and b for inserting spacer wires with the j+2th interweaving point b. The j+1th interweaving point b and the jth interweaving point a form a pair of interweaving points a and b for inserting spacer wires, and at the same time, they form a pair of interweaving points a and b for inserting spacer wires with the j+2th interweaving point a, j=1,…,n-2, so that cross-type spacer wires can be formed.

[0015] According to the preparation method of a circular structure three-dimensional spacer fabric as described above, n interweaving points a are numbered from 1 to n in the order of appearance, and n interweaving points b are numbered from 1 to n in the order of appearance. The i-th interweaving point a and the i-th interweaving point b form a pair of interweaving points a and b for inserting spacer wires, i=1,…,n, and at the same time, the j+1-th interweaving point a and the j-th interweaving point b form a pair of interweaving points a and b for inserting spacer wires, and at the same time, the j+2-th interweaving point b form a pair of interweaving points a and b for inserting spacer wires, the j+1-th interweaving point b and the j-th interweaving point a form a pair of interweaving points a and b for inserting spacer wires, and at the same time, the j+2-th interweaving point a form a pair of interweaving points a and b for inserting spacer wires, j=1,…,n-2, so that a composite spacer wire can be formed.

[0016] In the method for preparing a circular structured three-dimensional spacer fabric as described above, n=m.

[0017] The preparation method of the circular structure three-dimensional spacer fabric as described above adopts a hexagonal three-dimensional braiding machine, wherein the yarn carriers in the hexagonal three-dimensional braiding machine are distributed in r layers, and the layer numbers increase from the inside to the outside. The yarn carrier b is the yarn carrier of the r1 layer, the yarn carrier a is the yarn carrier of the r2 layer, and 3≤r1 <r2≤m。

[0018] The core of the hexagonal 3D braiding machine is a unique hexagonal cam arrangement that allows each cam to carry up to six yarn carriers, and the yarn carriers can move in six different planar directions. The hexagonal 3D braiding machine has been publicly published in papers such as "Novel three-dimensional braiding approach and its products [C] / / 17th International Conference on Composite Materials. Edinburgh, UK: ICCM, 2009: 27-31.", "Hexagonal braiding process, structure and performance and integrated design of braided composite materials [D]. Donghua University, 2013.", and "Construction and application of a new hexagonal 3D braiding machine [J]. Textile Guide, 2013, (04): 80-84."

[0019] The present invention controls the number of layers where the yarn carrier b is located to be at least 3 because if the number of layers where the yarn carrier b is located is less than 3, the movement trajectory of the yarn carrier at the corner of the weaving chassis is complex and the efficiency is low.

[0020] In the method for preparing a circular structure three-dimensional spacer fabric as described above, the difference between r2 and r1 is not less than 2; and the thickness of the circular structure three-dimensional spacer fabric exceeds 100 mm.

[0021] In the textile industry, spacer fabrics with a finished thickness exceeding 100mm are generally defined as extra-large-gauge spacer fabrics. The thickness of this type of fabric typically ranges from 100mm to 300mm, and in rare cases can even reach over 650mm. Extra-large-gauge spacer fabrics consist of two systems of surface yarns and one system of spacer yarns, forming a three-layer structure: an upper surface layer, a spacer layer, and a lower surface layer. The spacer yarns are arranged in a regular pattern between the two surface layers, forming a spacer layer with a certain thickness and spatial structure between the two surface layers of the fabric. The spacer yarns are arranged in three main forms within the fabric: mono-oblique, cross, and upright. Due to their exceptionally large spacing, this fabric exhibits unique and extensive application value, making it a versatile, high-performance textile material.

[0022] At present, the forming technologies of ultra-large gauge spacer fabrics are mainly divided into warp knitting and weaving.

[0023] Extra-large-gauge warp-knitted spacer fabrics are woven on modified double-needle-bar Raschel machines. Commonly used warp knitting machines range in gauge from E18 to E22, with working widths ranging from 1905 mm (75 inches) to 3505 mm (138 inches), and are typically equipped with five to six guide bars. During knitting, the first two guide bars loop the yarns on the front needles, forming one surface fabric; the second two guide bars loop the yarns on the rear needles, forming the other surface fabric. The middle one or two guide bars alternately loop the yarns on the front and rear needles, forming the spacer layer, thus creating a three-dimensional fabric with a defined spatial structure. Fabric thickness can be easily adjusted by adjusting the distance between the two lattice knockover plates. Depending on the arrangement of the filaments (monofilament or multifilament) in the spacer layer, the spacer yarn inlays can be categorized into V-shaped, X-shaped, I-shaped, and IXI-shaped configurations.

[0024] Ultra-large gauge woven spacer fabric is a novel fabric structure developed through weaving technology, primarily produced on rapier looms. It is a three-dimensional woven fabric composed of two parallel fabric surfaces connected by a set of spacer yarns or a set of spacer weaves. Different connection methods for the spacer layers can produce various interfacial structures, with common shapes including "V," "X," and "8."

[0025] However, the ultra-large-gauge spacer fabrics currently produced by these two molding methods are both planar structures and cannot be applied in applications requiring circular structures. There are no reports on circular structures in current ultra-large-gauge spacer fabric molding technology. Therefore, for applications requiring the production of ultra-large-gauge spacer fabrics with circular structures, existing molding technologies are unable to meet these requirements. The present invention addresses this problem by enabling the efficient and precise production of ultra-large-gauge spacer fabrics with circular structures.

[0026] In the present invention, the key factor affecting the thickness of the circular structure three-dimensional spacer fabric is the number of distribution layers of the yarn carriers. For each additional layer of yarn carrier, the fabric will increase a fixed contribution in the thickness direction. This contribution is recorded as the "single-layer contribution thickness" and is represented by "T". During the weaving process, since the difference between r2 and r1 is not less than 2, it means that at least two Ts are used to construct the thickness of the fabric. Therefore, the thickness of the circular structure three-dimensional spacer fabric will be greater than or equal to 2×T, that is, the thickness of the fabric at this time exceeds 100mm, which meets the definition of ultra-large gauge spacer fabric. In addition, the parameters that affect the density of the circular structure three-dimensional spacer fabric are mainly the thickness, quantity, weaving angle, and stretching speed of the yarn. The present invention can adjust these parameters during the weaving process to improve the control of the density of the circular structure three-dimensional spacer fabric, and it can also be processed and formed without the aid of auxiliary tools such as core rods.

[0027] In the method for preparing a circular structure three-dimensional spacer fabric as described above, the spacer yarns are fed by a feeding device, and the feeding device is located between the chassis and the collecting device of the hexagonal three-dimensional braiding machine;

[0028] The feeding device includes a supporting base, two slide rails, a yarn feeding track, a shuttle, a first driving device and a second driving device;

[0029] The two slide rails are fixed on the support base, arranged vertically and spaced apart. The yarn feeding track is slidably connected to the two slide rails at the same time, and the shuttle is slidably connected to the yarn feeding track. The first driving device is used to drive the shuttle to move horizontally along the yarn feeding track, and the second driving device is used to drive the yarn feeding track to move vertically along the two slide rails.

[0030] Beneficial effects:

[0031] (1) The present invention uses a hexagonal braiding chassis and a mechanism similar to the weft delivery in weaving to achieve the gradual addition of spacer yarns during the weaving process, thereby preparing a circular structured spacer fabric.

[0032] (2) The preparation method of the present invention is simple and easy. By selecting the number of weaving units of the chassis and the distance between the diameter of the spacer fabric and the circular size, the thickness and diameter of the spacer fabric can be easily adjusted to meet different application requirements.

[0033] (3) The present invention can produce circular structure ultra-large spacing spacer fabrics that meet the needs of various application fields, thereby improving the application range of circular structure three-dimensional spacer fabrics, especially in situations where specific shapes and structures are required, such as high-end sports equipment, advanced medical equipment, and the automotive industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1A schematic diagram of a production facility for circular three-dimensional spacer fabrics (top view);

[0035] Figure 2 Weaving diagrams for linear tracks and tracks at corners;

[0036] Figure 3 This is a diagram of the interlacing pattern of spacer yarn feeding;

[0037] Figure 4 Schematic diagram of the structure of the feeding device; wherein 4-support base, 5-first slide rail, 6-second slide rail, 7-yarn feeding track, 8-first drive device, 9-second drive device, 10-shuttle;

[0038] Figure 5 Schematic diagram of the structure of a circular three-dimensional spacer fabric, a corresponds to Example 1, b corresponds to Example 2, and c corresponds to Example 3;

[0039] Figure 6 This is a three-dimensional schematic diagram of the production equipment for circular structure three-dimensional spacer fabrics. DETAILED DESCRIPTION

[0040] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0041] The production equipment of the circular structure three-dimensional spacer fabric in the following embodiments is as follows Figure 1 and Figure 6 As shown, it includes a hexagonal three-dimensional braiding machine, a feeding device and a collecting device, and the feeding device is located between the chassis of the hexagonal three-dimensional braiding machine and the collecting device;

[0042] like Figure 1 As shown, the yarn carriers in the hexagonal three-dimensional braiding machine are distributed in four layers, and the layer numbers increase from the inside to the outside. The yarn carrier b is the yarn carrier of the first layer, and the yarn carrier a is the yarn carrier of the third layer.

[0043] like Figure 4 As shown, the feeding device includes a support base 4, a first slide rail 5, a second slide rail 6, a yarn feeding track 7, a shuttle 10, a first drive device 8 and a second drive device 9; the first slide rail 5 and the second slide rail 6 are fixed to the support base 4, arranged vertically and spaced apart, the yarn feeding track 7 is slidably connected to the first slide rail 5 and the second slide rail 6 at the same time, the shuttle 10 is slidably connected to the yarn feeding track 7, the first drive device 8 is used to drive the shuttle 10 to move horizontally along the yarn feeding track 7, and the second drive device 9 is used to drive the yarn feeding track 7 to move vertically along the first slide rail 5 and the second slide rail 6;

[0044] When using the feeding device to feed the spacer yarn, the first drive device 8 is started first, and the spacer yarn moves horizontally along the yarn feeding track 7 toward the second drive device 9 under the drive of the shuttle 10, guiding the spacer yarn to the predetermined position where each pair of interweaving points a and interweaving points b are about to be formed. As the weaving process continues, the yarn carrier a and the yarn carrier b respectively drive the yarn a and the yarn b to interweave, forming a pair of interweaving points a and interweaving points b at the predetermined position, thereby "sandwiching" (i.e., fixing) the spacer yarn between the two; when a new pair of interweaving points a and interweaving points b is to be formed directly below the pair of interweaving points a and interweaving points b to feed the spacer yarn, the second drive device 9 is started, and the position of the yarn feeding track 7 in the vertical direction is adjusted so that the shuttle 10 can guide the spacer yarn to the position where the new pair of interweaving points a and interweaving points b are about to be formed.

[0045] In the following embodiments, the interweaving of yarn a and yarn b is described by taking the third layer of a hexagonal three-dimensional braiding machine as an example. Figure 2 As shown:

[0046] (1) Linear track weaving:

[0047] (1.1) Cam No. 2 rotates 180° clockwise, causing yarn carrier No. 1 and yarn carrier No. 2 to exchange positions;

[0048] (1.2) Cam 3 rotates 180° counterclockwise, causing cams 1 and 3 to swap positions. Yarns a and b are now interwoven.

[0049] (2) Track weaving at corners;

[0050] (2.1) Cam No. 2 rotates 120° clockwise to move yarn carrier No. 2 to the starting position of yarn carrier No. 1, and then transfers yarns a and b to cam No. 4;

[0051] (2.2) Cam 3 rotates 60° clockwise and cam 4 rotates 60° counterclockwise, transferring yarns a and b to cam 5.

[0052] (2.3) Cam 5 rotates 120° counterclockwise, and then transfers yarns a and b back to cam 3. Cam 3 rotates 60° counterclockwise, and finally returns yarns a and b to the starting position of yarn carrier 2. At this time, the yarns are interwoven.

[0053] The feeding and interweaving rules of spacer yarn are as follows Figure 3 shown.

[0054] Example 1

[0055] A method for preparing a circular three-dimensional spacer fabric comprises the following steps: controlling a yarn carrier a to rotate about a vertical virtual axis to drive a group of yarns a to interweave; synchronously controlling a yarn carrier b to rotate about the virtual axis to drive a group of yarns b to interweave; when yarn carriers a and b rotate one circle about the virtual axis, yarn a is interwoven multiple times to form m interweaving points a; and yarn b is interwoven multiple times to form m interweaving points b, where m is a positive integer;

[0056] The m interweaving points a are numbered from 1 to m in the order of appearance, and the m interweaving points b are numbered from 1 to m in the order of appearance. The i-th interweaving point a and the i-th interweaving point b form a pair of interweaving points a and b for inserting spacer wires, i = 1, ..., m;

[0057] For each pair of interweaving points a and b, a spacer yarn is inserted between the two through a feeding device when they are first formed, and then weaving is continued. When a new pair of interweaving points a and b is formed directly below the pair of interweaving points a and b, the spacer yarn is inserted between the latest pair of interweaving points a and b through the feeding device. This process is repeated until the weaving is completed, and a circular structure three-dimensional spacer fabric is obtained.

[0058] like Figure 5 As shown in a, the final circular structure three-dimensional spacer fabric consists of an inner braided tube (woven from yarn b), an outer braided tube (woven from yarn a) and parallel spacer wires located between the two; the thickness of the circular structure three-dimensional spacer fabric exceeds 100 mm.

[0059] Example 2

[0060] A method for preparing a circular three-dimensional spacer fabric comprises the following steps: controlling a yarn carrier a to rotate about a vertical virtual axis to drive a group of yarns a to interweave; synchronously controlling a yarn carrier b to rotate about the virtual axis to drive a group of yarns b to interweave; when yarn carriers a and b rotate one circle about the virtual axis, yarn a is interwoven multiple times to form m interweaving points a; and yarn b is interwoven multiple times to form m interweaving points b, where m is a positive integer;

[0061] The m interweaving points a are numbered from 1 to m in the order of their appearance, and the m interweaving points b are numbered from 1 to m in the order of their appearance. The j+1th interweaving point a and the jth interweaving point b form a pair of interweaving points a and b for inserting spacer wires, and at the same time, form a pair of interweaving points a and b for inserting spacer wires with the j+2th interweaving point b. The j+1th interweaving point b and the jth interweaving point a form a pair of interweaving points a and b for inserting spacer wires, and at the same time, form a pair of interweaving points a and b for inserting spacer wires with the j+2th interweaving point a, where j=1,…,m-2;

[0062] For each pair of interweaving points a and b, a spacer yarn is inserted between the two through a feeding device when they are first formed, and then weaving is continued. When a new pair of interweaving points a and b is formed directly below the pair of interweaving points a and b, the spacer yarn is inserted between the latest pair of interweaving points a and b through the feeding device. This process is repeated until the weaving is completed, and a circular structure three-dimensional spacer fabric is obtained.

[0063] like Figure 5 As shown in b, the final circular structure three-dimensional spacer fabric is composed of an inner braided tube, an outer braided tube and a cross-type spacer wire located between the inner braided tube and the outer braided tube; the thickness of the circular structure three-dimensional spacer fabric exceeds 100 mm.

[0064] Example 3

[0065] A method for preparing a circular three-dimensional spacer fabric comprises the following steps: controlling a yarn carrier a to rotate about a vertical virtual axis to drive a group of yarns a to interweave; synchronously controlling a yarn carrier b to rotate about the virtual axis to drive a group of yarns b to interweave; when yarn carriers a and b rotate one circle about the virtual axis, yarn a is interwoven multiple times to form m interweaving points a; and yarn b is interwoven multiple times to form m interweaving points b, where m is a positive integer;

[0066] The m interweaving points a are numbered from 1 to m in the order of their appearance, and the m interweaving points b are numbered from 1 to m in the order of their appearance. The i-th interweaving point a and the i-th interweaving point b form a pair of interweaving points a and b for inserting spacer wires, i=1,…,m. At the same time, the j+1-th interweaving point a and the j-th interweaving point b form a pair of interweaving points a and b for inserting spacer wires, and at the same time, together with the j+2-th interweaving point b, form a pair of interweaving points a and b for inserting spacer wires. The j+1-th interweaving point b and the j-th interweaving point a form a pair of interweaving points a and b for inserting spacer wires, and at the same time, together with the j+2-th interweaving point a, form a pair of interweaving points a and b for inserting spacer wires, j=1,…,m-2;

[0067] For each pair of interweaving points a and b, a spacer yarn is inserted between the two through a feeding device when they are first formed, and then weaving is continued. When a new pair of interweaving points a and b is formed directly below the pair of interweaving points a and b, the spacer yarn is inserted between the latest pair of interweaving points a and b through the feeding device. This process is repeated until the weaving is completed, and a circular structure three-dimensional spacer fabric is obtained.

[0068] like Figure 5 As shown in c, the final circular structure three-dimensional spacer fabric is composed of an inner braided tube, an outer braided tube and a composite spacer wire located between the inner braided tube and the outer braided tube; the thickness of the circular structure three-dimensional spacer fabric exceeds 100 mm.

Claims

1. A method for preparing a circular structure three-dimensional spacer fabric, characterized in that: A group of yarns a is used to weave an outer braided tube, and a group of yarns b is used to weave an inner braided tube. The outer braided tube is sleeved on the inner braided tube, and the inner diameter of the outer braided tube is larger than the outer diameter of the inner braided tube. During the weaving process, multiple spacer wires are inserted between the interweaving points formed by yarns a and yarns b. As the weaving process progresses, the spacer wires are repeatedly inserted. After the weaving is completed, a circular three-dimensional spacer fabric is obtained. The specific process is as follows: a group of yarn carriers a distributed in a ring are controlled to rotate around a vertical virtual axis, driving a group of yarns a to be interwoven; a group of yarn carriers b distributed in a ring and located inside the yarn carriers a are synchronously controlled to rotate around the virtual axis, driving a group of yarns b to be interwoven; When yarn carrier a and yarn carrier b rotate one circle around the virtual axis, yarn a completes multiple interweaving to form m interweaving points a, and yarn b completes multiple interweaving to form m interweaving points b. The m interweaving points a are arranged at intervals from the m interweaving points b, where m is a positive integer. Selecting n interweaving points a and n interweaving points b from the m interweaving points a and the m interweaving points b, respectively, to form a plurality of pairs of interweaving points a and b; inserting a spacer yarn between each pair of interweaving points a and b when they are first formed; then continuing the weaving process; and when at least one new pair of interweaving points a and b is formed directly below the pair of interweaving points a and b, inserting the spacer yarn between the latest pair of interweaving points a and b; and repeating this process until the weaving is completed; A hexagonal three-dimensional braiding machine is used. The yarn carriers in the hexagonal three-dimensional braiding machine are distributed in r layers. The layer numbers increase from the inside to the outside. The yarn carrier b is the yarn carrier of the r1 layer, and the yarn carrier a is the yarn carrier of the r2 layer. 3≤r1 <r2≤m; The spacer yarn is fed by a feeding device, which is located between the chassis and the collecting device of the hexagonal 3D braiding machine; The feeding device includes a supporting base, two slide rails, a yarn feeding track, a shuttle, a first driving device and a second driving device; The two slide rails are fixed on the support base, arranged vertically and spaced apart. The yarn feeding track is slidably connected to the two slide rails at the same time, and the shuttle is slidably connected to the yarn feeding track. The first driving device is used to drive the shuttle to move horizontally along the yarn feeding track, and the second driving device is used to drive the yarn feeding track to move vertically along the two slide rails.

2. The method for preparing a circular structure three-dimensional spacer fabric according to claim 1, characterized in that: The n interweaving points a are numbered from 1 to n in the order of appearance, and the n interweaving points b are numbered from 1 to n in the order of appearance. The i-th interweaving point a and the i-th interweaving point b form a pair of interweaving points a and b for inserting spacer wires, i=1,…,n.

3. The method for preparing a circular structure three-dimensional spacer fabric according to claim 1, characterized in that: The n interweaving points a are numbered from 1 to n in the order of their appearance, and the n interweaving points b are numbered from 1 to n in the order of their appearance. The j+1th interweaving point a and the jth interweaving point b form a pair of interweaving points a and b for inserting spacer wires, and at the same time, they form a pair of interweaving points a and b for inserting spacer wires with the j+2th interweaving point b. The j+1th interweaving point b and the jth interweaving point a form a pair of interweaving points a and b for inserting spacer wires, and at the same time, they form a pair of interweaving points a and b for inserting spacer wires with the j+2th interweaving point a, j=1,…,n-2.

4. The method for preparing a circular structure three-dimensional spacer fabric according to claim 1, characterized in that: The n interweaving points a are numbered from 1 to n in the order of their appearance, and the n interweaving points b are numbered from 1 to n in the order of their appearance. The i-th interweaving point a and the i-th interweaving point b form a pair of interweaving points a and b for inserting spacer wires, i=1,…,n. At the same time, the j+1-th interweaving point a and the j-th interweaving point b form a pair of interweaving points a and b for inserting spacer wires, and at the same time, they form a pair of interweaving points a and b for inserting spacer wires with the j+2-th interweaving point b. The j+1-th interweaving point b and the j-th interweaving point a form a pair of interweaving points a and b for inserting spacer wires, and at the same time, they form a pair of interweaving points a and b for inserting spacer wires with the j+2-th interweaving point a, j=1,…,n-2.

5. The method for preparing a circular structure three-dimensional spacer fabric according to claim 1, characterized in that: n=m.

6. The method for preparing a circular structure three-dimensional spacer fabric according to claim 1, characterized in that: The difference between r2 and r1 is not less than 2; the thickness of the circular structure three-dimensional spacer fabric exceeds 100mm.

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