Radial yarn interlacing device for polar fabric, method of using same, and method of weaving a polar fabric

Abstract

The application discloses a radial yarn interlacing yarn lifting device of a polar fabric, a use method of the device and a polar fabric weaving method, and the device comprises four lifting units arranged around a weaving yarn disc in a circumferential direction, each lifting unit is provided with N vertical air cylinders, a piston rod in the air cylinder is formed with an air channel, and two ports of the air channel are connected with a vacuum pump and a suction disc respectively; each air cylinder is provided with a yarn hanging hanger directly below; the N yarn hanging hangers are adsorbed on a row yarn suction disc; each radial yarn is fixed at 90 degrees on the weaving yarn disc, and the two ends are connected with the yarn hanging hangers of the adjacent lifting units respectively. The use method comprises the following steps: one end of a circumferential yarn is fixed, the other end of the circumferential yarn is made to move in a circumferential motion around the center of the weaving yarn disc, each air cylinder is alternately executed yarn lifting and yarn dropping along with the circumferential motion of the circumferential yarn, and the circumferential yarn is interlaced through the radial yarn; when a single air cylinder lifts the yarn, the adsorption force of the suction disc is greater than the magnetic force between the yarn hanging hanger and the row yarn suction disc, and all the air cylinders adjacent to the air cylinder execute yarn dropping, and the polar fabric product has high quality.

Description

Technical Field

[0001] This invention belongs to the technical field of polar fabric weaving equipment, specifically relating to a radial yarn interlacing and lifting device for polar fabrics, its usage method, and a polar fabric weaving method. Background Technology

[0002] Polar braided composites are a new type of material developed in the 1990s. These composites use polar fabrics as fiber reinforcements and are formed in combination with a certain matrix material. Thanks to the circumferential and radial orientation of the fibers inside the polar fabric, the polar fabric has a high rotational load-bearing capacity. Composite materials formed by planar polar fabrics are widely used in aero-engine rotor components and flywheel energy storage components.

[0003] Polar fabrics are approximately circular, two-dimensional planar fabrics composed of two systems of yarns: radial yarns and circumferential yarns. Their weaving process follows the internal fiber interlacing pattern of polar fabrics: radial yarns are sequentially lifted to separate them into weave points, and then circumferential yarns are introduced using a yarn-drawing device to complete the weaving of the polar fabric. During the weaving process, some radial yarns need to be partially lifted. During this lifting process, it is crucial to prevent the radial yarns from becoming loose or tangled, while also ensuring that the unlifted radial yarns remain in a fixed position to prevent them from unraveling.

[0004] Currently, the yarn lifting process for polar fabrics mainly relies on manual labor, which has the following drawbacks:

[0005] Firstly, when manually picking and lifting yarn using tools, it is extremely easy to generate severe friction or snagging with the yarn (especially brittle fibers such as high-performance carbon fiber and ceramic fiber), leading to fiber surface damage, pilling, or even breakage. Existing technology lacks an effective mechanism for real-time, elastic control of yarn tension during the yarn lifting process, making it impossible to avoid internal yarn damage caused by sudden or excessive operating tension, thus limiting the reliable weaving of high-performance yarns.

[0006] Secondly, due to the uncertainty in the force applied, operating angle, and timing of manual yarn lifting, the size and shape of the weave opening (the space for introducing the circumferential yarn after lifting) vary with each lifting. This inconsistency directly leads to uneven stress and significant local density fluctuations at the yarn interlacing points within the polar fabric after the circumferential yarn is introduced. Consequently, the final polar woven composite material component has weak points in its mechanical properties. When such polar woven composite materials are used in high-speed rotating components (such as aircraft engine rotors) or under high-load conditions, they are prone to failure at these weak points. Currently, there is a long-standing lack of automated yarn lifting technology and devices that can achieve precise consistency in lifting height, speed, and position, making it impossible to form a standard weave opening with constant geometric dimensions and ensuring the homogenization of the polar fabric structure and the stability of its mechanical properties.

[0007] Thirdly, at the process integration level, the existing technology fails to establish a coherent automated route between the yarn lifting process and other processes (such as the initial arrangement of radial yarns and the introduction of circumferential yarns). This makes the entire process from yarn fabrication to yarn lifting and then to weft insertion dependent on manual connection and intervention, further affecting the process complexity and weaving inconsistency of polar fabrics.

[0008] Fourth, the high labor costs and complex processes make mass production difficult, failing to meet the demands for automated and large-scale production of polar fabrics. Current technologies neither address the yarn lifting devices involved in the weaving process of polar fabrics nor conduct research on the yarn lifting issues in this process. Summary of the Invention

[0009] To address the shortcomings of existing technologies, the purpose of this invention is to provide a radial yarn interlacing and lifting device for polar fabrics;

[0010] Another object of the present invention is to provide a method of using a radial yarn interlacing lifting device for polar fabrics;

[0011] Another object of the present invention is to provide a method for weaving polar fabrics.

[0012] A radial yarn interlacing lifting device for polar fabric includes: four lifting units, each lifting unit including: a lifting part and a fixing part, the lifting part including: N cylinders spaced apart, where N is an even number, each cylinder is vertically arranged, the piston rod of each cylinder faces downward, an air passage is formed inside the piston rod of each cylinder, the top end of the air passage is connected to a vacuum pump, and a suction cup is fixedly installed at the bottom end of each piston rod, and the suction cup is connected to the bottom end of the air passage;

[0013] The fixing part includes: a yarn feeding suction cup, which is located directly below N cylinders. The top surface of the yarn feeding suction cup is magnetically attached to N yarn hanging tags, with each suction cup facing one yarn hanging tag.

[0014] Four lifting units have their yarn feeding suction cups arranged circumferentially around the yarn weaving disc. The yarn weaving disc has an annular area for weaving polar fabrics. The annular area is divided into four sectors, each sector facing a lifting unit. The symmetry line of the sector and the center line of the yarn feeding suction cup facing it are on the same straight line. Adjacent sectors share a common radius side. M yarn hanging pins are formed on this common radius side at intervals, where M = 0.5N. The distance between the m-th yarn hanging pin on the four common radius sides corresponding to the four sectors and the center of the annular area is the same, where m = 1, 2, ..., M.

[0015] Each yarn hook hooks a single elastic control yarn. The elastic control yarns on both sides of the yarn hook are at a 90° angle. One end of each elastic control yarn is connected to the side of the yarn hook tag of a lifting unit near the weaving disc. The other end of each elastic control yarn is connected to the side of the yarn hook tag of another lifting unit near the weaving disc. The elastic control yarn between each yarn hook tag and its corresponding yarn hook is the radial yarn of a polar fabric.

[0016] Each lifting unit has N cylinders corresponding to two vacuum pumps. The even-numbered cylinders in the N cylinders correspond to the first vacuum pump, and the odd-numbered cylinders in the N cylinders correspond to the second vacuum pump.

[0017] In the above technical solution, the suction force of the suction cup is 60N to 80N.

[0018] In the above technical solution, the yarn feeding suction cup is made of permanent magnet material with a surface magnetic flux density ≥0.4T; the bottom of the yarn hanging tag is embedded with an iron piece to achieve adsorption with the yarn feeding suction cup 3-1.

[0019] In the above technical solution, N cylinders are fixedly mounted on a fixed bracket, which is horizontally positioned.

[0020] In the above technical solution, a yarn-splitting unit is fixed between each fan-shaped section and the yarn-distributing suction cup. Each yarn-splitting unit includes N+1 yarn-splitting components. The N+1 yarn-splitting components are arranged at intervals along a straight line and their relative positions are fixed. Each yarn-splitting component includes: a first fixing member, a second fixing member, and two yarn-splitting steel needles. The first fixing member, the two yarn-splitting steel needles, and the second fixing member are arranged in sequence along the vertical direction. The bottom end of the first fixing member is hinged to the top end of the upper yarn-splitting steel needle, and the top end of the second fixing member is hinged to the bottom end of the lower yarn-splitting steel needle. The bottom surface of the upper yarn-splitting steel needle is the first inclined surface, and the top surface of the lower yarn-splitting steel needle is the second inclined surface. The first inclined surface and the second inclined surface are in contact with each other. The space between the two yarn-splitting steel needles is used to pass through the circumferential yarn. With the direction of the circumferential yarn's advance as the front, the height of the first inclined surface gradually decreases from back to front.

[0021] A torsion spring is installed at the hinge between the first fixing member and the upper yarn-separating steel needle, and a torsion spring is installed at the hinge between the second fixing member and the lower yarn-separating steel needle. The two torsion springs can make the two yarn-separating steel needles rotate automatically, so that the first inclined surface and the second inclined surface are in contact. When the first inclined surface and the second inclined surface are in contact, the yarn-separating assembly is closed; when the first inclined surface and the second inclined surface are separated, the yarn-separating assembly is open.

[0022] The method of using the radial yarn interlacing lifting device for the above-mentioned polar fabric includes: connecting one end of the circumferential yarn to the inner ring of the annular area, and making the other end of the circumferential yarn move in a circular motion around the center of the annular area. Each cylinder performs corresponding yarn lifting and yarn dropping as the circumferential yarn moves, so that a single circumferential yarn passes through the adjacent radial yarns in an alternating manner.

[0023] In each lifting unit, when any one of the N cylinders performs yarn lifting, all cylinders adjacent to that cylinder perform yarn dropping.

[0024] When the cylinder performs the yarn lifting action, the piston rod moves vertically downwards to approach the yarn hanging tag, making the suction force of the suction cup greater than the magnetic force between the yarn hanging tag and the yarn feeding suction cup. This causes the yarn hanging tag to detach from the yarn feeding suction cup and the suction cup to adhere to the yarn hanging tag. Consequently, the piston rod drives the yarn hanging tag to move vertically upwards, lifting the radial yarn connected to the yarn hanging tag, and the circumferential yarn passes under the radial yarn corresponding to the yarn lifting action.

[0025] When the cylinder performs the yarn dropping, the piston rod moves vertically downward to near the top of the yarn feeding suction cup, so that the suction force of the suction cup on the yarn hanging tag is less than the magnetic force between the yarn hanging tag and the yarn feeding suction cup. Under the combined action of gravity and magnetic force, the yarn hanging tag falls back onto the yarn feeding suction cup in the vertical direction, and the circumferential yarn passes over the top of the radial yarn corresponding to the yarn dropping.

[0026] A method for weaving polar fabrics, which involves using the aforementioned radial yarn interlacing and lifting device for polar fabrics.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. This invention provides a radial yarn interlacing lifting device for polar fabrics, solving the long-standing technical problem of automated yarn lifting in the field of polar fabrics. It achieves automatic lifting and resetting of the radial yarns. Through programmed control of the lifting unit, the height, speed, and position of each yarn lift are precisely consistent, resulting in a standard weave with constant geometric dimensions. This ensures that the lifting path and tension of each radial yarn are highly uniform during the introduction of the circumferential yarn, guaranteeing the structural consistency and mechanical properties of the polar fabric. This invention significantly reduces labor costs and operational complexity, substantially improves weaving efficiency, and lays the equipment foundation for the large-scale production of polar fabrics.

[0029] 2. The yarn separating unit works in concert with the lifting unit. The yarn separating unit, through the precise cooperation of two yarn separating steel needles, completes the accurate separation and guidance of the radial yarn during the automated yarn lifting process, which creates a precise and repeatable path for the introduction of the subsequent circumferential yarn, resulting in the woven polar fabric with regular yarn arrangement and uniform density.

[0030] 3. The polar fabric woven using the radial yarn interlacing and lifting device of this invention produces high-quality finished polar fabrics. This results in highly uniform and predictable superior mechanical properties in subsequent polar woven composite materials made from these fabrics, endowing them with higher and more stable circumferential load-bearing capacity and better fatigue resistance, effectively extending the service life of composite products. This invention is particularly applicable to high-performance yarns used in the preparation of composite materials such as carbon fiber and glass fiber. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the radial yarn interlacing and lifting device for polar fabrics according to the present invention.

[0032] Figure 2 This is a schematic diagram of a single lifting unit structure of the present invention (a braiding yarn disc is also shown in the figure).

[0033] Figure 3 This is a schematic diagram of the radial yarn arrangement of the present invention;

[0034] Figure 4 This is a schematic diagram of the radial yarn lifting process of the present invention;

[0035] Figure 5 This is a schematic diagram of the operation of a single yarn separating component of the present invention;

[0036] Figure 6 Photographs of actual polar fabrics;

[0037] Figure 7 (a) is a top view of a polar fabric-reinforced composite panel. Figure 7 (b) is a schematic diagram of the standard tensile specimen dimensions;

[0038] Figure 8 This is a comparison diagram of the stress-strain curves of the standard tensile specimens of Example 4 and Comparative Example 1.

[0039] Among them, 1-1: cylinder, 1-2: piston rod, 1-3: fixed bracket, 2: suction cup, 3-1: yarn feeding suction cup, 3-2: yarn hanging tag, 4: weaving yarn tray, 5: radial yarn, 6: yarn separating unit, 6-1: yarn separating steel needle, 6-2: first fixing part, 6-3: second fixing part, 7: circumferential yarn. Detailed Implementation

[0040] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0041] Example 1

[0042] like Figure 1 , Figure 2As shown, a radial yarn interlacing lifting device for polar fabric includes: four lifting units, each lifting unit including: a lifting part and a fixing part, the lifting part including: N cylinders 1-1 spaced apart (N varies with the fabric size and has no fixed range), N is an even number, each cylinder 1-1 is vertically arranged, the piston rod 1-2 of each cylinder 1-1 faces downward, an air passage is formed in the piston rod 1-2 of each cylinder 1-1, the top end of the air passage is connected to a vacuum pump (connected through an air pipe), and a suction cup 2 is fixedly installed at the bottom end of each piston rod 1-2, and the suction cup 2 is connected to the bottom end of the air passage;

[0043] The fixing part includes: yarn feeding suction cup 3-1, which is located directly below N cylinders 1-1. N yarn hanging tags 3-2 are magnetically attached to the top surface of the yarn feeding suction cup 3-1, with each suction cup 2 facing one yarn hanging tag 3-2 (the surface of the yarn hanging tag 3-2 is a smooth surface).

[0044] like Figure 3 As shown ( Figure 3 The quantity of the inner hanging tag 3-2 is for illustrative purposes only and is not limited to the actual number of tags. Figure 1 , Figure 2 (The number of hanging tags 3-2 varies and does not constitute a limitation on the present invention). The yarn feeding suction cups 3-1 of the four lifting units are arranged in a circumferential direction around the yarn weaving disc 4. The yarn weaving disc 4 has an annular area for weaving polar fabrics. The annular area is divided into four fan-shaped sections. Each fan-shaped section is directly opposite a lifting unit. The symmetry line of the fan-shaped section and the center line of the yarn feeding suction cup 3-1 directly opposite it are on the same straight line. Adjacent fan-shaped sections share a common radius side. M hanging nails (not shown) are formed on the common radius side at intervals. M=0.5N. The distance between the m-th hanging nail on the four common radius sides corresponding to the four fan-shaped sections and the center of the annular area is the same. m=1, 2...M.

[0045] Each yarn hook hooks onto one elastic control yarn. The elastic control yarns on both sides of the yarn hook are at a 90° angle. One end of each elastic control yarn is connected to the side of the yarn hook tag 3-2 of one lifting unit near the weaving disc 4, and the other end of each elastic control yarn is connected to the side of the yarn hook tag 3-2 of another lifting unit near the weaving disc 4. The elastic control yarn between each yarn hook tag 3-2 and its corresponding yarn hook is the radial yarn of a polar fabric (for details on the yarn hooks, yarn feeding suction cups, and yarn hook tags, please refer to CN120250236A).

[0046] Each lifting unit has N cylinders 1-1 corresponding to two vacuum pumps. The even-numbered cylinders 1-1 in the N cylinders 1-1 correspond to the first vacuum pump, and the odd-numbered cylinders 1-1 in the N cylinders 1-1 correspond to the second vacuum pump.

[0047] Preferably, the suction force of the suction cup 2 is 60N to 80N.

[0048] Preferably, the yarn feeding suction cup 3-1 is made of permanent magnet material with a surface magnetic flux density ≥0.4T (0.4T is the basic performance reference index to avoid the yarn feeding suction cup 3-1 being unable to effectively adsorb the hanging tag 3-2 due to the low permanent magnet adsorption level); the bottom of the hanging tag 3-2 is embedded with an iron piece to achieve adsorption with the yarn feeding suction cup 3-1.

[0049] The method of using the aforementioned radial yarn interlacing lifting device for polar fabrics includes: connecting one end of the circular yarn 7 to the inner ring of the annular region, and causing the other end of the circular yarn 7 to move in a circular motion around the center of the annular region (the circular motion of the circular yarn 7 can be achieved using a quantitative yarn feeding device for polar fabrics as described in CN118957870A, such as...). Figure 4 As shown), each cylinder 1-1 performs the corresponding yarn lifting and unwinding as the circumferential yarn 7 moves, so that a single circumferential yarn 7 passes through the adjacent two radial yarns 5 alternately, one above the other.

[0050] In this process, each cylinder 1-1 alternately performs yarn lifting and yarn dropping. When any one of the N cylinders 1-1 in each lifting unit performs yarn lifting, all cylinders 1-1 adjacent to that cylinder 1-1 perform yarn dropping.

[0051] like Figure 4 As shown, when cylinder 1-1 performs yarn lifting, piston rod 1-2 moves vertically downward to near yarn hanging tag 3-2, so that the suction force of suction cup 2 is greater than the magnetic force between yarn hanging tag 3-2 and yarn discharging suction cup 3-1, causing yarn hanging tag 3-2 to detach from yarn discharging suction cup 3-1 and suction cup 2 to adhere to yarn hanging tag 3-2. In turn, piston rod 1-2 drives yarn hanging tag 3-2 to move vertically upward, and radial yarn 5 connected to yarn hanging tag 3-2 is lifted, and circumferential yarn 7 passes under the radial yarn 5 corresponding to the yarn lifting operation.

[0052] When cylinder 1-1 performs the yarn dropping, piston rod 1-2 moves vertically downward to near the yarn feeding suction cup 3-1, so that the suction force of suction cup 2 on yarn hanging tag 3-2 is less than the magnetic force between yarn hanging tag 3-2 and yarn feeding suction cup 3-1. Under the combined action of gravity and magnetic force, yarn hanging tag 3-2 falls back to yarn feeding suction cup 3-1 in the vertical direction (the vacuum pump reduces the negative pressure of air extraction to reduce the negative pressure of suction cup 2, so that yarn hanging tag 3-2 can fall automatically). Circular yarn 7 passes over the radial yarn 5 corresponding to the yarn dropping operation.

[0053] In this embodiment, the cylinder and suction cup can be a vacuum-mounted free-mount cylinder (brand SMC, model ZCUK, the vacuum suction cup of this product is mounted on the piston rod).

[0054] Example 2

[0055] like Figure 1 As shown, a radial yarn interlacing lifting device for polar fabrics, based on embodiment 1, has N cylinders 1-1 fixedly mounted on a fixed bracket 1-3 (the cylinder body of cylinder 1-1 is fixedly mounted to the fixed bracket 1-3). The fixed bracket 1-3 is horizontally arranged to relative position the N cylinders 1-1 and provide stable support.

[0056] like Figure 1 As shown, a yarn separating unit 6 is fixed between each fan-shaped section and the yarn feeding suction cup 3-1. Each yarn separating unit 6 includes N+1 yarn separating components. The N+1 yarn separating components are arranged at intervals along a straight line and their relative positions are fixed. For example, Figure 5 As shown, a single yarn-dividing assembly includes: a first fixing member, a second fixing member, and two yarn-dividing steel needles 6-1 (the first fixing members of N+1 yarn-dividing assemblies are parallel to each other, and the second fixing members of N+1 yarn-dividing assemblies are parallel to each other). The first fixing member 6-2, the two yarn-dividing steel needles 6-1, and the second fixing member 6-3 are arranged in sequence along the vertical direction. The bottom end of the first fixing member is hinged to the top end of the upper yarn-dividing steel needle 6-1, and the top end of the second fixing member is hinged to the bottom end of the lower yarn-dividing steel needle 6-1. The bottom surface of the upper yarn-dividing steel needle 6-1 is the first inclined surface, and the top surface of the lower yarn-dividing steel needle 6-1 is the second inclined surface. The first inclined surface and the second inclined surface are in contact with each other. The two yarn-dividing steel needles 6-1 are used to pass through the circumferential yarn 7. With the direction of the circumferential yarn 7 forward as the front, the height of the first inclined surface gradually decreases from back to front.

[0057] A torsion spring is installed at the hinge between the first fixing member and the upper yarn-separating needle 6-1, and a torsion spring is installed at the hinge between the second fixing member and the lower yarn-separating needle 6-1. The two torsion springs can cause the two yarn-separating needles 6-1 to rotate automatically, thereby bringing the first inclined surface and the second inclined surface into contact. When the first inclined surface and the second inclined surface are in contact, the yarn-separating assembly is closed; when the first inclined surface and the second inclined surface are separated, the yarn-separating assembly is open.

[0058] When the yarn separating assembly is closed, it can constrain the position of the radial yarns 5, ensuring that they are arranged neatly and orderly, and preventing problems such as the radial yarns 5 shifting, crossing, tangling, or becoming tangled. The circumferential yarns 7 move in a circular motion, passing through all the yarn separating assemblies in sequence, and the yarn separating assembly is opened when passing through each one.

[0059] Example 3

[0060] A method for weaving polar fabrics, employing the radial yarn interlacing and lifting device of the polar fabric in Example 2, and weaving according to the method of using the radial yarn interlacing and lifting device of the polar fabric in Example 1, yields a polar fabric as shown below. Figure 6 As shown (both radial yarn 5 and circumferential yarn 7 are made of aramid), from Figure 6 As can be seen, this invention relies on a highly precise and automated radial yarn interlacing and lifting device to control the yarn lifting and weft insertion processes, effectively protecting the internal fibers of the radial yarn 5 and the circular yarn 7. Surface damage and breakage rates of the radial yarn 5 and the circular yarn 7 are significantly reduced, maximizing the preservation of the original mechanical properties of the fibers. Simultaneously, because this invention utilizes the automated control of the radial yarn interlacing and lifting device, the weave openings formed by adjacent radial yarns 5 maintain a high degree of consistency in size and shape. This results in uniform stress and stable structural density at the yarn interlacing points within the woven polar fabric. This fundamentally avoids problems such as uneven tension of the radial yarn 5, inconsistent tightness at the interlacing points of the radial yarn 5 and the circular yarn 7, and localized uneven density caused by fluctuations in weave opening dimensions, thereby eliminating the resulting mechanical weaknesses.

[0061] Example 4

[0062] A method for preparing a polar fabric-reinforced composite material plate includes the following steps:

[0063] Step 1: Select T800 high-strength carbon fiber as radial yarn 5 and circumferential yarn 7 (T800 high-strength carbon fiber was purchased from Shanxi Gangke Carbon Materials Co., Ltd.), and weave four identical polar fabrics using the polar fabric weaving method of Example 3. Then, stack the four polar fabrics layer by layer to form a reinforcing skeleton, and place the reinforcing skeleton into a vacuum bag mold.

[0064] Step 2: Mix type 6349 epoxy resin and curing agent at a weight ratio of 100:33. After stirring evenly with a stirrer, place the mixture in an oven and degas it under vacuum to obtain a resin mixture. Then, inject the resin mixture into a vacuum bag mold and fully impregnate the reinforcing skeleton with the pressure difference formed by the vacuum pump. Subsequently, place the vacuum bag mold in an oven and heat it to 80°C at a rate of 2°C / min. Maintain the temperature at 80°C for 3 hours to complete the curing and obtain a polar fabric reinforced composite material board.

[0065] Comparative Example 1

[0066] The preparation method of a polar fabric reinforced composite material plate is basically the same as that of the preparation method of the polar fabric reinforced composite material plate in Example 4. The only difference is the polar fabric. In this comparative example 1, the weaving method of the polar fabric is completed manually (the lifting and lowering of the radial yarn 5 are done manually. When lifting the yarn, the yarn tension of the radial yarn 5 needs to be adjusted manually to prevent the yarn from being loose or too tight. At the same time, it is necessary to ensure that the unlifted radial yarn 5 remains in place to avoid unraveling or misalignment). Then, the yarn is manually passed through the circumferential yarn 7 to weave the polar fabric.

[0067] like Figure 7As shown, to verify the practical application effect of the radial yarn interlacing lifting device for polar fabrics of the present invention, the polar fabric reinforced composite material plates of Example 4 and Comparative Example 1 were precisely cut along the radial direction to obtain standard tensile specimens (the length direction of the standard tensile specimens is parallel to the radial direction of the polar fabric reinforced composite material plate). The dimensions of the standard tensile specimens were 250 mm × 25 mm × 2 mm. According to the polymer matrix composite tensile property testing standard ASTM D3039, a universal testing machine was used to conduct radial tensile tests on the two sets of standard tensile specimens of Example 4 and Comparative Example 1. The tensile speed was 2 mm / min. The test results are as follows: Figure 8 As shown.

[0068] from Figure 8 It can be seen that both the standard tensile specimens in Example 4 and Comparative Example 1 exhibited linear elastic deformation behavior in which stress and strain were proportional during the tensile process, and both eventually experienced sudden brittle fracture. However, they differed significantly in their ultimate tensile properties: Comparative Example 1 (i.e., Figure 8 The radial tensile strength of the standard tensile specimen in "manual yarn lifting" is 263 MPa, while that in Example 4 (i.e.) Figure 8 The radial tensile strength of the standard tensile specimen inside the "interlaced yarn lifting device" reached 331 MPa. Compared with manual yarn lifting, the radial tensile strength of the standard tensile specimen in Example 4 increased by approximately 25.8%.

[0069] The above results show that the manual yarn lifting in Comparative Example 1 is highly dependent on the skill level of the operator. It is easily affected by fluctuations in manual operation, resulting in poor consistency of the weave size and shape, uneven tension of the radial yarn 5, inconsistent tightness of the yarn interlacing points, and uneven density of the local structure. This leads to the formation of mechanical weak points inside the fabric, making it impossible to guarantee the homogenization of the polar fabric structure and the stability of its mechanical properties. Ultimately, the prepared standard tensile specimens break prematurely in the weak areas during radial tensioning, exhibiting low radial tensile strength. In contrast, Example 4 uses the radial yarn interlacing lifting device of the present invention for polar fabrics, which can achieve uniform and stable tension control of the radial yarn 5, ensuring the straightness and orientation accuracy of the radial yarn 5, and effectively reducing fiber damage during weaving. As a result, the standard tensile specimens of Example 4 can achieve a highly synergistic load-bearing effect when subjected to external tensile loads.

[0070] The present invention has been described above by way of example. It should be noted that any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort without departing from the core of the present invention fall within the protection scope of the present invention.

Claims

1. A radial yarn interlacing and lifting device for polar fabrics, characterized in that, include: Four lifting units, each lifting unit includes: a lifting part and a fixing part. The lifting part includes: N cylinders (1-1) spaced apart, where N is an even number. Each cylinder (1-1) is vertically arranged. The piston rod (1-2) of each cylinder (1-1) faces downward. An air passage is formed inside the piston rod (1-2) of each cylinder (1-1). The top end of the air passage is connected to a vacuum pump. A suction cup (2) is fixedly installed at the bottom end of each piston rod (1-2), and the suction cup (2) is connected to the bottom end of the air passage. The fixing part includes: a yarn feeding suction cup (3-1), which is located directly below N cylinders (1-1). The top surface of the yarn feeding suction cup (3-1) is magnetically attached to N yarn hanging tags (3-2), with each suction cup (2) facing one yarn hanging tag (3-2). The yarn feeding suction cups (3-1) of the four lifting units are arranged around the yarn weaving disc (4) in a circumferential direction. A circular area for weaving polar fabric is formed on the yarn weaving disc (4). The circular area is divided into four fan-shaped sections. Each fan-shaped section is directly opposite a lifting unit. Two adjacent fan-shaped sections share a common radius side. M yarn hanging nails are formed at intervals on the common radius side, where M=0.5N. Each yarn hook hooks a single elastic control yarn. The elastic control yarns on both sides of the yarn hook are at a 90° angle. One end of each elastic control yarn is connected to the side of the yarn hook tag (3-2) of a lifting unit near the weaving disc (4). The other end of each elastic control yarn is connected to the side of the yarn hook tag (3-2) of another lifting unit near the weaving disc (4). The elastic control yarn between each yarn hook tag (3-2) and its corresponding yarn hook is the radial yarn (5) of a polar fabric.

2. The radial yarn interlacing and lifting device for polar fabrics according to claim 1, characterized in that, The suction force of the suction cup (2) is 60N~80N.

3. The radial yarn interlacing and lifting device for polar fabrics according to claim 1, characterized in that, The yarn feeding suction cup (3-1) is made of permanent magnet material with a surface magnetic flux density ≥0.4T; the bottom of the yarn hanging tag (3-2) is embedded with an iron piece to achieve adsorption with the yarn feeding suction cup (3-1).

4. The radial yarn interlacing and lifting device for polar fabrics according to claim 1, characterized in that, N cylinders (1-1) are fixedly mounted on a fixed bracket (1-3), which is horizontally positioned.

5. The radial yarn interlacing and lifting device for polar fabrics according to claim 1, characterized in that, A yarn-splitting unit (6) is fixed between each fan-shaped section and the yarn-distributing suction cup (3-1). Each yarn-splitting unit (6) includes N+1 yarn-splitting components. The N+1 yarn-splitting components are arranged at intervals along a straight line and their relative positions are fixed. Each yarn-splitting component includes: a first fixing member (6-2), a second fixing member (6-3), and two yarn-splitting steel needles (6-1). The first fixing member (6-2), the two yarn-splitting steel needles (6-1), and the second fixing member (6-3) are arranged sequentially in the vertical direction. 2) The bottom end of the second fixing part (6-3) is hinged to the top end of the upper yarn separating steel needle (6-1), and the top end of the second fixing part (6-3) is hinged to the bottom end of the lower yarn separating steel needle (6-1). The bottom surface of the upper yarn separating steel needle (6-1) is the first inclined surface, and the top surface of the lower yarn separating steel needle (6-1) is the second inclined surface. The first inclined surface and the second inclined surface are in contact with each other. The two yarn separating steel needles (6-1) are used to pass through the circumferential yarn (7). With the direction of the circumferential yarn (7) forward as the front, the height of the first inclined surface gradually decreases from back to front. A torsion spring is installed at the hinge between the first fixing member (6-2) and the upper yarn separating steel needle (6-1), and a torsion spring is installed at the hinge between the second fixing member (6-3) and the lower yarn separating steel needle (6-1). The two torsion springs can make the two yarn separating steel needles (6-1) rotate automatically so that the first inclined surface and the second inclined surface are in contact. When the first inclined surface and the second inclined surface are in contact, the yarn separating assembly is closed. When the first inclined surface and the second inclined surface are separated, the yarn separating assembly is open.

6. The radial yarn interlacing and lifting device for polar fabrics according to claim 1, characterized in that, The symmetry line of the fan shape and the center line of the yarn feeding cup (3-1) directly opposite it are on the same straight line.

7. The radial yarn interlacing and lifting device for polar fabrics according to claim 1, characterized in that, The distance between the m-th hanging pin on the four common radius sides of the four sectors and the center of the annular region is the same, where m = 1, 2, ..., M.

8. The radial yarn interlacing and lifting device for polar fabrics according to claim 1, characterized in that, Each lifting unit has N cylinders (1-1) corresponding to two vacuum pumps. The even-numbered cylinders (1-1) in the N cylinders (1-1) correspond to the first vacuum pump, and the odd-numbered cylinders (1-1) in the N cylinders (1-1) correspond to the second vacuum pump.

9. The method of using the radial yarn interlacing and lifting device for polar fabrics according to any one of claims 1 to 8, characterized in that, include: One end of the circumferential yarn (7) is connected to the inner ring of the annular area, and the other end of the circumferential yarn (7) moves in a circular motion with the center of the annular area as the center. Each cylinder (1-1) performs the corresponding yarn lifting and yarn dropping as the circumferential yarn (7) moves in a circular motion, so that a single circumferential yarn (7) passes through the adjacent two radial yarns (5) alternately. When any one of the N cylinders (1-1) in each lifting unit performs yarn lifting, all cylinders (1-1) adjacent to that cylinder (1-1) perform yarn dropping. When the cylinder (1-1) performs the yarn lifting action, the piston rod (1-2) moves vertically downward to near the yarn hanging tag (3-2), so that the suction force of the suction cup (2) is greater than the magnetic force between the yarn hanging tag (3-2) and the yarn feeding suction cup (3-1), causing the yarn hanging tag (3-2) to detach from the yarn feeding suction cup (3-1) and the suction cup (2) to attract the yarn hanging tag (3-2), thereby causing the piston rod (1-2) to drive the yarn hanging tag (3-2) to move vertically upward, and the radial yarn (5) connected to the yarn hanging tag (3-2) is lifted, and the circumferential yarn (7) passes under the radial yarn (5) corresponding to the yarn lifting action; When the cylinder (1-1) performs the doffing, the piston rod (1-2) moves vertically downward to near the yarn feeding suction cup (3-1), so that the suction force of the suction cup (2) on the yarn hanging tag (3-2) is less than the magnetic force between the yarn hanging tag (3-2) and the yarn feeding suction cup (3-1). Under the combined action of gravity and magnetic force, the yarn hanging tag (3-2) falls back onto the yarn feeding suction cup (3-1) in the vertical direction, and the circumferential yarn (7) passes over the radial yarn (5) corresponding to the doffing.

10. A method for weaving polar fabrics, characterized in that, The fabric is woven using the radial yarn interlacing and lifting device of any one of 1 to 8.

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