Three-dimensional intersecting spiral knitting device and knitting method thereof

Abstract

The three-dimensional intersecting spiral knitting device comprises a first knitting unit and a second knitting unit, the two knitting units are arranged at intervals in a staggered mode to form a square matrix type combination, the first knitting unit comprises a supporting platform, a rotating disc and a yarn carrier, the rotating disc is rotationally connected with the supporting platform, and the yarn carrier is rotationally connected with the supporting platform. Four grooves are evenly distributed in the rotating disc and the supporting platform in the circumferential direction, each yarn carrier is arranged in the corresponding groove, and an outer tooth gear ring is arranged on the lower end face of the rotating disc. A rotating shaft is arranged in the center of the rotating disc, a rotating cam and a first driven gear are arranged at the upper end and the lower end of the rotating shaft, a second driven gear is arranged at the lower end of the rotating shaft of the second knitting unit, and an outer tooth ring gear, a first transmission gear and a second transmission gear are all connected with a driving motor. And respectively rotating to weave the silk threads. The total bearing capacity of the braided wire can be improved, and meanwhile, the bending resistance and the shearing resistance are enhanced.

Description

Technical Field

[0001] The invention relates to a composite material weaving technology, in particular to a three-dimensional intersecting spiral weaving device and a weaving method thereof. Background Art

[0002] At present, the equipment used in industrial development has increasingly higher requirements for material performance. Compared with ordinary materials, three-dimensional braided materials have better stress-bearing structure, lighter weight and more stable shape under the same volume. They can greatly improve material performance and are widely used in today's industrial production.

[0003] The development of three-dimensional braided materials in China is relatively late. Although remarkable research results have been achieved in recent years, most of the problems existing in domestic three-dimensional braided materials are that the braided materials have a single force direction, complex braiding procedures, high weaving difficulty, and high cost. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a three-dimensional intersecting spiral braiding device and a braiding method thereof with reasonable design, good braiding effect and high production efficiency.

[0005] The technical solution of the present invention is: A three-dimensional intersecting spiral braiding device comprises a first braiding unit and a second braiding unit, wherein the first braiding unit and the second braiding unit are arranged alternately to form a square array combination, wherein the first braiding unit comprises a supporting platform, a rotating disc and a yarn carrier, wherein the rotating disc is arranged on the supporting platform and the two are rotatably matched, wherein the rotating disc and the supporting platform are evenly distributed with four grooves along the circumference, wherein the yarn carrier is arranged in each of the grooves, and an outer toothed ring is arranged on the lower end surface of the rotating disc; A rotating shaft is arranged at the center of the rotating disc, a rotating cam is arranged at the upper end of the rotating shaft, the rotating cam pushes the yarn carrier to move back and forth in the groove between adjacent weaving units through a push rod, and a first driven gear is arranged at the lower end of the rotating shaft; The structure of the second weaving unit is different from that of the first weaving unit in that a second driven gear is provided at the lower end of the rotating shaft, and the installation height of the second driven gear is lower than that of the first driven gear; The outer gear ring, the first transmission gear and the second transmission gear are respectively connected to the driving motor to rotate respectively to weave the silk thread.

[0006] Further: the outer gear rings of the first weaving unit and the second weaving unit are connected together through a group of intermediate transition gears, and are finally connected to the outer gear ring drive motor; the first driven gear of the first weaving unit is connected together through another group of intermediate transition gears, and is finally connected to the first driven gear drive motor; the second driven gear of the second weaving unit is connected together through another group of intermediate transition gears, and is finally connected to the second driven gear drive motor.

[0007] Furthermore: the supporting platform is square, and a central step shaft hole is arranged on its upper end surface, the rotating disc is located at the upper part of the central step shaft hole, and the outer gear ring extends from the lower part of the central step shaft hole.

[0008] Furthermore: a stepped through hole is provided at the center of the rotating disc, wherein the small-diameter through hole is rotatably connected to the transmission shaft, the rotating cam is provided at the upper end of the rotating shaft, and the rotating cam is located in the large-diameter through hole, a radial through hole is provided between the large-diameter through hole and the groove, a push rod is provided in the radial through hole, and the two are slidably matched, a return spring is provided between the push rod and the hole wall of the large-diameter through hole, and the elastic force of the return spring makes the inner end of the push rod closely contact with the outer annular surface of the rotating cam.

[0009] Furthermore: the push rod is a stepped rod structure, the diameter of the inner end rod section is larger than the diameter of the outer end rod section, and the large diameter rod section and the small diameter rod section are movably connected, and the movably connected includes a threaded connection or a snap connection.

[0010] Furthermore: each of the grooves is provided with a guide rail groove and an electromagnet, the guide rail at the lower end of each yarn carrier matches the guide rail groove, the two are slidably matched, each yarn carrier is provided with ferromagnetic metal material, and the upper end of the yarn carrier is provided with a wire column.

[0011] Furthermore, the supporting platform, rotating disc and yarn carrier are respectively made of aluminum alloy or ABS engineering plastics to reduce the friction of the slide rail during exchange; the ferromagnetic metal material is iron, cobalt or nickel.

[0012] Furthermore: there is no contact between adjacent support platforms or between the support platform and the rotating disc, and there is a gap between the two, and the gap is no greater than the width of the yarn carrier, so as to prevent the yarn carrier from falling.

[0013] A three-dimensional intersecting spiral braiding method using the three-dimensional intersecting spiral braiding device comprises the following steps: a. Form a suitable square array as required, and in the original state, no yarn carrier is placed in the outermost groove of the square array; b. The electromagnet is powered off, and the second transmission gear of the second weaving unit rotates 45 degrees, thereby driving the rotating cam to rotate. The rotating cam pushes the corresponding push rod forward, so that the left and right yarn carriers of the second weaving unit enter the groove of the first weaving unit. The electromagnet is powered on and adsorbs the ferromagnetic material on the yarn carrier to fix the yarn carrier, and all gears rotate 180 degrees. c. The electromagnet is powered off, and the second transmission gear of the second weaving unit rotates 90 degrees, driving the rotating cam to rotate. The rotating cam pushes the push rod forward, so that the upper and lower yarn carriers of the second weaving unit enter the groove of the first weaving unit. The electromagnet is powered on to fix the yarn carrier, and all gears rotate 180 degrees. d. The electromagnet is powered off, the second transmission gear of the second weaving unit rotates 45 degrees, the first transmission gear of the first weaving unit rotates 45 degrees, driving the rotating cam to rotate, and the rotating cam pushes the push rod forward, so that the left and right yarn carriers of the first weaving unit enter the groove of the second weaving unit, the electromagnet is powered on, the yarn carrier 3 is fixed, and all gears rotate 180 degrees; e. The electromagnet is powered off, the first transmission gear of the first weaving unit rotates 90 degrees, driving the rotating cam to rotate, and the rotating cam pushes the push rod forward, so that the upper and lower yarn carriers of the first weaving unit enter the groove of the second weaving unit, the electromagnet is powered on to fix the yarn carrier, all gears rotate 180 degrees, and the first transmission gear of the first weaving unit rotates 45 degrees; f. At this time, the yarn carrier and the rotating cam return to their original positions, and the above operations can be repeated repeatedly to finally form the fabric.

[0014] Further: the structural monomer is composed of four auxiliary lines wrapped around the axis, and the four auxiliary lines are at the four vertices of the circle, with the angle between the vertices being 90 degrees. They make circular motion with the midpoint of the disk as the center, and make uniform linear motion on the axis plane, spirally advancing 360 degrees in the guiding direction of the main line, and entangled with each other to form a structural monomer. The structural monomers are connected in an interlaced manner, and they are both the four lines that constitute a structural monomer and one of the four lines of the four adjacent structural monomers.

[0015] The beneficial effects of the present invention are: 1. The present invention comprises four auxiliary lines around the axis, which make circular motion with the midpoint of the disk as the center, uniform linear motion on the axis plane, spirally advance 360 ​​degrees around the guide direction of the main line, and entwine with each other to form a structural monomer. The structural monomers are staggered and connected to form a three-dimensional braided structure, which can improve the total bearing capacity of the braided line and enhance the bending resistance and shear resistance.

[0016] 2. The present invention can ensure the regularity and consistency of the movement of the yarn carrier by setting the guide rail, prevent deviation, and improve the weaving effect.

[0017] 3. The present invention adopts the cooperation of the cam and the push rod, which can periodically push the yarn carrier to move back and forth, and can participate in the weaving of adjacent different rotating discs with good consistency.

[0018] 4. The outer gear ring, the first driven gear and the second driven gear of the present invention are connected in series in three layers, each layer is connected by an intermediate transition gear, and finally each layer is driven by a driving motor to achieve the purpose of unified rotation.

[0019] 5. The invention has reasonable design, good preparation effect and high production efficiency, and is especially suitable for large-scale production and has good economic benefits after promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural diagram of a three-dimensional intersecting spiral weaving device; Figure 2 for Figure 1 A side view of a three-dimensional intersecting spiral braiding device is shown; Figure 3 for Figure 1 A top view of a three-dimensional intersecting spiral braiding device is shown; Figure 4 for Figure 1 The three-dimensional structure diagram of the middle yarn carrier; Figure 5 for Figure 1 A magnified top view of a weaving unit; Figure 6 for Figure 5 One of the side views of the braiding unit shown; Figure 7 for Figure 5 A second side view of the braiding unit shown; Figure 8 for Figure 5 Structural diagram of the top push rod; Fig. 9 for Figure 1 Schematic diagram of the interconnection between the inner and outer gear rings. DETAILED DESCRIPTION

[0021] Example 1: See Figure 1 — Fig. 9 In the figure, 1-the first weaving unit, 2-the second weaving unit, 3-the yarn carrier, 11-the supporting platform, 12-the groove, 13-the guide groove, 14-the rotating cam, 15-the push rod, 16-the return spring, 17-the electromagnet, 18-the outer gear ring, 19-the first driven gear, 20-the rotating shaft, 21-the second driven gear, 22-the rotating disk, 31-the line column, 32-the base, 33-the guide rail.

[0022] A three-dimensional intersecting spiral weaving device comprises a first weaving unit 1 and a second weaving unit 2, wherein the first weaving unit 1 and the second weaving unit 2 are arranged alternately to form a square array combination (a 4*4 square array is shown in the figure, and a 7*7 square array, a 11*12 square array, or a 50*60 square array can also be formed, which is selected according to actual needs and is not listed one by one), wherein: the first weaving unit 1 comprises a supporting platform 11, a rotating disc 22 and a yarn carrier 3, the rotating disc 22 is arranged on the supporting platform 11 and the two are rotatably matched, the rotating disc 22 and the supporting platform 11 are evenly distributed with four grooves 12 along the circumference, each groove 12 is provided with a yarn carrier 3, and the lower end surface of the rotating disc 22 is provided with an external toothed ring 18; A rotating shaft 20 is arranged at the center of the rotating disc 22, a rotating cam 14 is arranged at the upper end of the rotating shaft 20, and the rotating cam 14 pushes the yarn carrier 3 to move back and forth in the groove 12 between adjacent weaving units through the push rod 15, and a first driven gear 19 is arranged at the lower end of the rotating shaft 20; The structure of the second weaving unit 2 is substantially the same as that of the first weaving unit 1, except that a second driven gear 21 is disposed at the lower end of the rotating shaft 20, and the installation height of the second driven gear 21 is lower than that of the first driven gear 19; The outer gear ring 18, the first transmission gear 19 and the second transmission gear 21 are respectively connected to the driving motor to realize respective rotation to weave the silk thread.

[0023] Preferred solution: The outer gear rings 18 of the first weaving unit 1 and the second weaving unit 2 are connected together through a set of intermediate transition gears ( Fig. 9 As shown in FIG. 1 , the first driven gear 19 of the first weaving unit 1 is connected together through another set of intermediate transition gears and is finally connected to the first driven gear driving motor; the second driven gear 21 of the second weaving unit 2 is connected together through another set of intermediate transition gears and is finally connected to the second driven gear driving motor. The number of driving motors is reduced.

[0024] Preferred solution: the supporting platform 11 is square, and a central step shaft hole is provided on its upper end face, the rotating disc 22 is located at the upper part of the central step shaft hole, and the outer gear ring 18 extends from the lower part of the central step shaft hole to facilitate mutual meshing connection.

[0025] Preferred solution: A stepped through hole is provided at the center of the rotating disk 22, wherein the small-diameter through hole is rotatably connected to the transmission shaft 20, a rotating cam 14 is provided at the upper end of the rotating shaft 20, the rotating cam 14 is located in the large-diameter through hole, a radial through hole is provided between the large-diameter through hole and the groove 12, a push rod 15 is provided in the radial through hole, the two are slidably matched, a return spring 16 is provided between the push rod 15 and the hole wall of the large-diameter through hole, the elastic force of the return spring 16 makes the inner end of the push rod 15 closely contact with the outer annular surface of the rotating cam 14.

[0026] Preferred solution: The push rod 15 is a stepped rod structure, the diameter of the inner end rod section is larger than the diameter of the outer end rod section, and the large diameter rod section and the small diameter rod section are movably connected, and the movably connected includes a threaded connection or a snap connection, which is convenient for disassembly and assembly.

[0027] Preferred solution: A guide groove 13 and an electromagnet 17 are provided in each groove 12, and the guide rail 33 at the lower end of each yarn carrier 3 matches the guide groove 13, and the two are slidably matched. Each yarn carrier 3 is provided with ferromagnetic metal material (not shown in the figure), and a wire column 31 is provided at the upper end of the yarn carrier 3, with a base 32 in the middle, and yarn can be put on the wire column 31.

[0028] Optimal solution: the supporting platform 11, the rotating disc 22 and the yarn carrier 3 are respectively made of aluminum alloy or ABS engineering plastics to reduce the friction of the slide rail during exchange; the ferromagnetic metal material is iron, cobalt or nickel.

[0029] Optimal solution: There is no contact between adjacent support platforms 11 or between the support platform 11 and the rotating disk 22, and there is a gap between the two. The gap is no greater than the width of the yarn carrier 3 to prevent the yarn carrier 3 from falling.

[0030] Weaving method: 1. A suitable square array is formed as required, and in the original state, no yarn carrier 3 is placed in the outermost groove 12 of the square array.

[0031] 2. The electromagnet 17 is powered off, and the second transmission gear 21 of the second weaving unit 2 rotates 45 degrees, thereby driving the rotating cam 14 to rotate. The rotating cam 14 is similar to a shuttle shape, with two long sides and two short sides. The rotating cam 14 pushes the corresponding push rod 15 forward, so that the left and right yarn carriers 3 of the second weaving unit 2 enter the groove 12 of the first weaving unit 1. The electromagnet 17 is energized and adsorbs the ferromagnetic material on the yarn carrier 3 to fix the yarn carrier 3, and all gears rotate 180 degrees.

[0032] 3. The electromagnet 17 is powered off, and the second transmission gear 21 of the second weaving unit 2 rotates 90 degrees, driving the rotating cam 14 to rotate. The rotating cam 14 pushes the push rod 15 forward, so that the upper and lower yarn carriers 3 of the second weaving unit 2 enter the groove 12 of the first weaving unit 1. The electromagnet 17 is powered on to fix the yarn carrier 3, and all gears rotate 180 degrees.

[0033] 4. The electromagnet 17 is powered off, the second transmission gear 21 of the second weaving unit 2 rotates 45 degrees, the first transmission gear 19 of the first weaving unit 1 rotates 45 degrees, driving the rotating cam 19 to rotate, and the rotating cam 14 pushes the push rod 15 forward, so that the left and right yarn carriers 3 of the first weaving unit 1 enter the groove 12 of the second weaving unit 2, the electromagnet 17 is powered on, the yarn carrier 3 is fixed, and all gears rotate 180 degrees.

[0034] 5. The electromagnet 17 is powered off, and the first transmission gear 19 of the first weaving unit 1 rotates 90 degrees, driving the rotating cam 14 to rotate. The rotating cam 14 pushes the push rod 15 forward, so that the upper and lower yarn carriers of the first weaving unit 1 enter the groove 12 of the second weaving unit 2. The electromagnet 17 is powered on to fix the yarn carrier 3, all gears rotate 180 degrees, and the first transmission gear 19 of the first weaving unit 1 rotates 45 degrees.

[0035] At this time, the yarn carrier 3 and the rotating cam 14 return to their original positions, and the above operation can be repeated repeatedly.

[0036] This structural monomer is composed of four auxiliary wires wrapped around the axis (hereinafter referred to as winding wires). The four auxiliary wires are at the four vertices of the circle, with the angle between the vertices being 90 degrees. They make circular motion with the midpoint of the disk as the center, and make uniform linear motion on the axis plane. They spiral forward 360 degrees in the guiding direction of the main line and entwine with each other to form a structural monomer. The structural monomers are connected in an interlaced manner, which constitute the four wires of a structural monomer and are also one of the four wires of the four adjacent structural monomers.

[0037] When the force direction of the structure changes greatly, windings with high toughness and tolerance, such as glass fiber, carbon fiber and other materials should be used. The silk thread can be flexibly changed according to the different environments in which the materials are used. For example, aramid silver fiber or polyimide silver fiber can be used for high temperatures, and ceramic fiber can be used if thermal insulation is required.

[0038] 1. Excellent mechanical properties: When subjected to tension in one direction, because the structural unit is composed of four wires interwoven with each other, the tension in different directions will be distributed to the four wires from the intersection point, so that the force will not act on one point, thereby improving the overall bearing capacity of the braided body.

[0039] 2. Strong shear resistance: When the braided body is subjected to shear force, because the braided wire is spiral in shape as a whole, when it is subjected to shear force in one direction, the direction of the shear force is difficult to be perpendicular to the force point on the braided wire, so the force will be decomposed and the shear force on the braided body will be reduced.

[0040] 3. Strong resistance to bending: When an object is bent, the greatest force is applied at the bent part. When the maximum yield limit of the object is exceeded, the object will break. However, the braided structure is spiral, which can disperse the stress at the bent part to the unbent part, reducing the force, increasing the overall yield limit of the bent part, and extending the service life of the braid.

[0041] The main form of the braided structure is a three-dimensional interwoven spiral shape, which can be used as the main body of a composite material or a tough material structure. However, when in use, in order to ensure that there is sufficient contact force between the winding wires, a brittle material should be poured to wrap the braided body.

[0042] Embodiment 2: This embodiment is basically the same as Embodiment 1, and the similarities are not repeated. The difference is that the outer gear ring, the first transmission gear 19 and the second transmission gear 21 are not connected together through an intermediate transition gear, but are connected to the drive motors respectively. This solution is suitable for small square arrays.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification made according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A three-dimensional intersecting spiral weaving device, comprising a first weaving unit and a second weaving unit, wherein the first weaving unit and the second weaving unit are arranged alternately to form a square array combination, wherein: The first weaving unit comprises a supporting platform, a rotating disc and a yarn carrier, wherein the rotating disc is arranged on the supporting platform and the two are rotatably matched, the rotating disc and the supporting platform are evenly distributed with four grooves along the circumference, each of the grooves is provided with the yarn carrier, and the lower end surface of the rotating disc is provided with an external toothed ring; A rotating shaft is arranged at the center of the rotating disc, a rotating cam is arranged at the upper end of the rotating shaft, the rotating cam pushes the yarn carrier to move back and forth in the groove between adjacent weaving units through a push rod, and a first driven gear is arranged at the lower end of the rotating shaft; The structure of the second weaving unit is different from that of the first weaving unit in that a second driven gear is provided at the lower end of the rotating shaft, and the installation height of the second driven gear is lower than that of the first driven gear; The outer gear ring, the first transmission gear and the second transmission gear are respectively connected to the driving motor to rotate respectively to weave the silk thread.

2. A three-dimensional intersecting spiral braiding device according to claim 1, characterized in that: The outer gear rings of the first weaving unit and the second weaving unit are connected together through a group of intermediate transition gears, and are finally connected to the outer gear ring drive motor; the first driven gear of the first weaving unit is connected together through another group of intermediate transition gears, and is finally connected to the first driven gear drive motor; the second driven gear of the second weaving unit is connected together through another group of intermediate transition gears, and is finally connected to the second driven gear drive motor.

3. A three-dimensional intersecting spiral braiding device according to claim 1, characterized in that: The supporting platform is square, and a central step shaft hole is arranged on its upper end surface. The rotating disc is located at the upper part of the central step shaft hole, and the outer gear ring extends from the lower part of the central step shaft hole.

4. A three-dimensional intersecting spiral braiding device according to claim 1, characterized in that: A stepped through hole is provided at the center of the rotating disc, wherein the small-diameter through hole is rotatably connected to the transmission shaft, the rotating cam is provided at the upper end of the rotating shaft, and the rotating cam is located in the large-diameter through hole, a radial through hole is provided between the large-diameter through hole and the groove, a push rod is provided in the radial through hole, and the two are slidably matched, and a return spring is provided between the push rod and the hole wall of the large-diameter through hole, and the elastic force of the return spring makes the inner end of the push rod closely contact with the outer annular surface of the rotating cam.

5. A three-dimensional intersecting spiral braiding device according to claim 4, characterized in that: The push rod is a stepped rod structure, the diameter of the inner end rod section is larger than the diameter of the outer end rod section, and the large diameter rod section and the small diameter rod section are movably connected, and the movably connected includes a threaded connection or a snap connection.

6. A three-dimensional intersecting spiral braiding device according to claim 1, characterized in that: A guide rail groove and an electromagnet are arranged in each of the grooves. The guide rail at the lower end of each yarn carrier matches the guide rail groove, and the two are slidably matched. Ferromagnetic metal material is arranged on each yarn carrier, and a wire column is arranged at the upper end of the yarn carrier.

7. A three-dimensional intersecting spiral braiding device according to claim 6, characterized in that: The supporting platform, rotating disc and yarn carrier are respectively made of aluminum alloy or ABS engineering plastics to reduce the friction of the slide rail during exchange; the ferromagnetic metal material is iron, cobalt or nickel.

8. A three-dimensional intersecting spiral braiding device according to claim 1, characterized in that: There is no contact between adjacent support platforms or between the support platform and the rotating disc, and there is a gap between the two. The gap is no greater than the width of the yarn carrier, so as to prevent the yarn carrier from falling.

9. A three-dimensional intersecting spiral braiding method using the three-dimensional intersecting spiral braiding device according to any one of claims 1 to 8, comprising the following steps: a. Form a suitable square array as required, and in the original state, no yarn carrier is placed in the outermost groove of the square array; b. The electromagnet is powered off, and the second transmission gear of the second weaving unit rotates 45 degrees, thereby driving the rotating cam to rotate. The rotating cam pushes the corresponding push rod forward, so that the left and right yarn carriers of the second weaving unit enter the groove of the first weaving unit. The electromagnet is powered on and adsorbs the ferromagnetic material on the yarn carrier to fix the yarn carrier, and all gears rotate 180 degrees. c. The electromagnet is powered off, and the second transmission gear of the second weaving unit rotates 90 degrees, driving the rotating cam to rotate. The rotating cam pushes the push rod forward, so that the upper and lower yarn carriers of the second weaving unit enter the groove of the first weaving unit. The electromagnet is powered on to fix the yarn carrier, and all gears rotate 180 degrees. d. The electromagnet is powered off, the second transmission gear of the second weaving unit rotates 45 degrees, the first transmission gear of the first weaving unit rotates 45 degrees, driving the rotating cam to rotate, and the rotating cam pushes the push rod forward, so that the left and right yarn carriers of the first weaving unit enter the groove of the second weaving unit, the electromagnet is powered on, the yarn carrier 3 is fixed, and all gears rotate 180 degrees; e. The electromagnet is powered off, the first transmission gear of the first weaving unit rotates 90 degrees, driving the rotating cam to rotate, and the rotating cam pushes the push rod forward, so that the upper and lower yarn carriers of the first weaving unit enter the groove of the second weaving unit, the electromagnet is powered on to fix the yarn carrier, all gears rotate 180 degrees, and the first transmission gear of the first weaving unit rotates 45 degrees; f. At this time, the yarn carrier and the rotating cam return to their original positions, and the above operations can be repeated repeatedly to eventually form the fabric.

10. A three-dimensional intersecting spiral weaving method according to claim 9, characterized in that: This structural monomer is composed of four auxiliary lines wrapped around the axis. The four auxiliary lines are at the four vertices of the circle, with the angle between the vertices being 90 degrees. They make circular motion with the midpoint of the disk as the center, make uniform linear motion on the axis plane, spiral forward 360 degrees in the guiding direction of the main line, and entwine with each other to form a structural monomer. The structural monomers are connected in an interlaced manner, and they are both the four lines that constitute a structural monomer and one of the four lines of the four adjacent structural monomers.

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