High-rigidity and high-brittleness filament continuous two-for-one twisting method and device and application thereof

Abstract

The invention discloses a continuous two-for-one twisting method and device for high-rigidity and high-brittleness filaments and application of the continuous two-for-one twisting method and device, and belongs to the technical field of textile processing. The device comprises a yarn inlet, a bobbin upper connecting device, a winding bobbin, a fixed base, a connecting device, a bobbin lower fixing device, a twisting device, a spindle, a yarn passing nozzle, an air ring and an air ring control device. The processing method comprises the steps that after being unwound from a winding bobbin, filaments sequentially pass through the balloon control device, the filament inlet and other components and are twisted through the twisting device, a balloon ring is formed, and the two-for-one twisting process is completed. The device is suitable for two-for-one twisting processing of high-modulus and high-brittleness inorganic nonmetal filaments, organic filaments, composite filaments and the like. Compared with the prior art, by optimizing the structural parameters of the balloon control device and the filament inlet, the end breakage rate of the high-modulus and high-brittleness filaments is remarkably reduced, the production efficiency and the product quality are improved, and wide application and popularization value is achieved.

Description

Technical Field

[0001] The present invention relates to the field of textile processing technology, and in particular to a method and device for continuous doubling of high-rigidity and high-brittleness filaments and applications thereof. Background Art

[0002] High-strength and high-brittleness filaments (such as basalt fiber and silicon carbide fiber) have broad application prospects in aerospace, defense, electronics, and other fields due to their excellent properties such as high strength, high modulus, and high-temperature resistance. However, the high brittleness of these fibers makes them prone to breakage during the traditional two-for-one twisting process, resulting in low production efficiency and unstable product quality. The balloon control device of traditional filament two-for-one twisting equipment has a small diameter, resulting in a small yarn bending angle and bending strain exceeding the fiber's fracture threshold. The right-angle design of the yarn inlet causes local stress concentration and a breakage rate of over 15%. Furthermore, the lack of a dynamic friction-reducing structure makes the fiber surface susceptible to friction damage.

[0003] Conventional filament two-for-one twisting devices (such as the Zhejiang Titan TH-6) present numerous challenges when processing high-strength, high-brittleness filaments. These challenges primarily stem from design flaws in the balloon control device and yarn inlet, a lack of dynamic friction-reducing mechanisms, and inappropriate processing parameters. The balloon control device's small diameter results in a narrow yarn bending angle, causing bending strains exceeding the fiber's breakage threshold. Furthermore, the right-angled or acutely angled edges easily scratch the fiber surface. The right-angled design of the yarn inlet subjects the fibers to significant bending stress upon entry, leading to localized stress concentration and potentially instantaneous breakage of high-strength, high-brittleness filaments. Furthermore, the conventional device lacks an effective dynamic friction-reducing mechanism, resulting in high friction between the fibers and the device during processing. This generates frictional heat, damages the fiber surface, reduces fiber strength, and further increases the risk of breakage. Furthermore, processing parameters (such as twist direction, twist, spindle speed, winding speed, and winding angle) are not optimized for the characteristics of high-strength, high-brittleness filaments. Consequently, the fibers cannot maintain adequate flexibility and strength during processing, further exacerbating the fiber breakage problem.

[0004] Although researchers have made some improvements to the processing technology for high-strength, high-brittleness filaments, existing technologies still cannot completely solve the problem of high-strength, high-brittleness filaments being easily broken during the two-for-one twisting process. For example, Chinese Invention Patent Publication No. CN105088431A discloses a two-for-one twisting method for conductive, low-shrinkage polyester industrial yarn on an ALLMA two-for-one twister. This method optimizes the design of the tension rod and twist disc guide holes by placing anti-entanglement pads and conductive yarn tubes in the spindle tank. However, this method is primarily targeted at low-shrinkage polyester industrial yarn and has poor processing effects on high-strength, high-brittleness filaments (such as basalt fiber and silicon carbide fiber). This is primarily due to the method's failure to optimize the structure of the balloon control device and the yarn inlet, nor to optimize the processing parameters based on the characteristics of high-strength, high-brittleness filaments. Therefore, it cannot effectively solve the problem of high-strength, high-brittleness filaments being easily broken during processing.

[0005] Therefore, it is crucial to develop a continuous two-for-one twisting device suitable for high-rigidity and high-brittleness filaments to reduce the risk of fiber breakage during processing and improve production efficiency and product quality. Summary of the Invention

[0006] In order to solve the deficiencies in the prior art, the present invention aims to provide a method and device for continuous doubling of high-rigidity and high-brittleness filaments and their application, so as to solve the problems in the prior art of easy breakage, low production efficiency and unstable product quality during the processing of high-rigidity and high-brittleness filaments.

[0007] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0008] A high-rigidity and high-brittleness filament continuous two-for-one twisting device, comprising:

[0009] Yarn inlet: located above the filament twisting device, serving as the entrance for high-strength and high-brittle filaments to enter the twisting device;

[0010] Connecting device on the bobbin: connects the yarn inlet and the fixed base;

[0011] Winding bobbin: a package for storing raw yarn;

[0012] Fixed base: the base that supports the winding bobbin;

[0013] Connecting device: connects the fixed base and the fixing device under the bobbin;

[0014] Bore bobbin lower fixing device: fixes the lower bracket of the winding bobbin;

[0015] Twisting device: core twisting mechanism, fixedly connected to the spindle;

[0016] Spindle: driven to rotate by a transmission belt;

[0017] Yarn feeder: installed on the twisting device, guiding the high-strength and high-brittleness filaments in and out;

[0018] Balloon ring: a circular track formed when high-strength and high-brittle filaments are twisted;

[0019] Balloon control device: Its outer diameter is 50-55mm, thickness is 2-3mm, edge is semicircular arc, semicircular arc curvature radius is 2-3mm, and the upper and lower heights are adjustable;

[0020] The outer layer of the balloon control device is a self-lubricating wire-cutting ring, and the interior contains a fixed ring fixedly connected to the fixed base. The self-lubricating wire-cutting ring is one of a graphite ring, a self-lubricating ceramic ring, a self-lubricating plastic ring, and a lubricating metal ring.

[0021] The outer layer of the balloon control device is a self-lubricating wire-cutting ring, and the interior contains a fixed ring, which is fixedly connected to the fixed base. The balloon control device also contains a bearing. The high-rigidity and high-brittleness filament can drive the outer layer of the self-lubricating wire-cutting ring to rotate. The self-lubricating wire-cutting ring is one of a graphite ring, a self-lubricating ceramic ring, a self-lubricating plastic ring, and a lubricating metal ring.

[0022] The height of the balloon control device from the top of the wire inlet is 1-30 mm.

[0023] Preferably, the height of the balloon control device from the top of the wire inlet is 15-20 mm.

[0024] The wire inlet is in a trumpet shape, with the trumpet mouth facing upward and the edge being arc-shaped, and the inner curvature radius is 1-15 mm.

[0025] Preferably, the wire inlet is trumpet-shaped, with the trumpet mouth facing upward and the edge being arc-shaped, and the inner curvature radius is 5-10 mm.

[0026] A method for processing high-rigidity and high-brittleness filaments using the device comprises the following steps:

[0027] After the high-rigidity and high-brittleness filament is unwound from the winding bobbin, it first passes through the balloon control device, then enters the yarn inlet, and then passes through the internal holes of the connecting device on the bobbin, the fixed base, the winding bobbin, the fixed base, the connecting device, and the fixing device under the bobbin. It is twisted through the yarn mouth on the twisting device, and finally forms a balloon ring from bottom to top, completing the double twisting process.

[0028] The processing parameters of the double twisting are as follows: twisting direction is S or Z twist, twist 80-5000 T / m, spindle speed 3500-14000 rpm, winding speed 1-80 m / min, winding angle 5-25°, and winding bobbin size: inner diameter 37 mm × outer diameter 42 mm × length 240-320 mm.

[0029] The device is used for the two-for-one twisting of high-rigidity and high-brittleness filaments, wherein the high-rigidity and high-brittleness filaments are at least one of inorganic non-metallic filaments, organic filaments, and composite filaments.

[0030] The high-strength and high-brittleness inorganic non-metallic filaments include basalt fibers, glass fibers, carbon fibers, alumina fibers, silicon carbide fibers, quartz fibers, boron fibers, and silicon nitride fibers; the high-strength and high-brittleness organic filaments include hemp-viscose filaments and bamboo-viscose filaments; the high-strength and high-brittleness composite filaments include composite filaments of high-strength and high-brittleness inorganic non-metallic filaments and various organic filaments.

[0031] The balloon control device in conventional filament twisting systems has a relatively small diameter, resulting in excessive bending strain during the bending process of high-strength, high-brittleness filaments, making them prone to breakage. To address this issue, the present invention increases the outer diameter of the balloon control device to 50-55mm. This improvement significantly increases the bending space for high-strength, high-brittleness filaments, increasing the bending angle and reducing the bending strain to well below the breaking threshold. By increasing the diameter of the balloon control device, stress concentration during the bending process is effectively reduced, lowering the risk of breakage.

[0032] On the basis of expanding the diameter of the balloon control device, its shape and structure have been further optimized. The edge of the balloon control device adopts a semicircular arc design with a curvature radius of 2-3mm, which avoids scratches on the high-rigidity and high-brittle filaments by sharp angles. At the same time, the thickness of the balloon control device is controlled at 2-3mm to ensure the lightness and flexibility of the device. In addition, the outer layer of the balloon control device adopts a self-lubricating wire ring to reduce the friction coefficient and significantly reduce the friction between the high-rigidity and high-brittle filaments and the device. It is fixedly connected to the fixed base to ensure the stability of the device. Through these optimized designs, the balloon control device can not only effectively control the bending stress of the high-rigidity and high-brittle filaments, but also reduce friction damage on the surface of the high-rigidity and high-brittle filaments.

[0033] To further reduce dynamic friction damage to high-strength, high-brittleness filaments in the balloon control device, the present invention incorporates a bearing-like disc structure. The balloon control device's outer self-lubricating wire ring utilizes a bearing-like disc structure, allowing the high-strength, high-brittleness filaments to drive the outer self-lubricating wire ring in rotation. This design transforms the dynamic friction between the high-strength, high-brittleness filaments and the device into rolling friction, significantly reducing the coefficient of friction and the generation of frictional heat. This also prevents micro-scraping damage to the surface of the high-strength, high-brittleness filaments by the self-lubricating wire ring, further reducing the breakage rate of the high-strength, high-brittleness filaments.

[0034] The yarn inlet of a traditional two-for-one twisting device is designed at a right angle, which causes local stress concentration and makes the high-rigidity and high-brittleness filaments easily break when entering the device. To solve this problem, the present invention designs the yarn inlet into a trumpet shape, with the trumpet mouth facing upward, the edges in an arc shape, and the internal curvature radius of 5-10mm. This design can effectively disperse the bending stress of the high-rigidity and high-brittleness filaments, making the stress distribution to the high-rigidity and high-brittleness filaments more uniform when entering the device. Compared with the traditional right-angled yarn inlet, the bending strain is reduced, which significantly reduces the risk of damage to the high-rigidity and high-brittleness filaments when entering the device.

[0035] Based on the adoption of a trumpet-shaped wire inlet, the curvature radius was further optimized. Multiple experiments verified that a 7mm radius of curvature for the high-strength, high-brittleness filament resulted in low bending strain and a moderate contact area, achieving both mechanical safety and thermal stability. If the curvature radius is too large (e.g., 12mm), while the bending strain is reduced, the contact area increases, increasing the probability of micro-scraping damage to the high-strength, high-brittleness filament surface and frictional heat, which can easily lead to thermal breakage. If the curvature radius is too small (e.g., 2mm), the bending strain increases, the contact pressure increases, and the breakage rate increases.

[0036] The height relationship between the balloon control device and the wire inlet has a significant impact on the processing effect of high-rigidity and high-brittleness filaments. The present invention designs the height of the balloon control device from the top of the wire inlet to be 1-30mm, preferably 15-20mm. When the height of the balloon control device is 18mm, the bending curvature radius of the high-rigidity and high-brittleness filaments in the balloon section and the wire inlet section can be simultaneously optimized to form a smooth transition. If the height of the balloon control device is too low (such as 10mm), the bending radius of the balloon section is reduced and the stress concentration increases; if the height is too high (such as 26mm), the bending angle of the wire inlet section is reduced, which will also exceed the critical stress gradient threshold and increase the breakage rate. By optimizing the height of the balloon control device, the bending stress balance of the high-rigidity and high-brittleness filaments in the balloon section and the wire inlet section is achieved, further reducing the risk of breakage of the high-rigidity and high-brittleness filaments.

[0037] The present invention achieves a synergistic effect by optimizing the structural parameters of the balloon control device and the yarn inlet. Under the conditions that the balloon control device has an outer diameter of 52mm, a thickness of 2.5mm, an edge curvature radius of 1.25mm, a bearing-like disc structure, an arc-shaped edge of the yarn inlet, an internal curvature radius of 7mm, and a height of 18mm from the balloon control device to the yarn inlet, the breakage rate of high-strength and high-brittleness filaments is significantly reduced, and processing stability is greatly improved. This synergistic optimization design not only solves the problem of high-strength and high-brittleness filaments being easily broken during the two-for-one twisting process, but also improves production efficiency and product quality.

[0038] The device of this invention is not only suitable for the two-for-one twisting of high-strength and high-brittleness inorganic non-metallic filaments (such as basalt fiber, alumina fiber, silicon carbide fiber, quartz fiber, boron fiber, and silicon nitride fiber), but can also be applied to the two-for-one twisting of high-strength and high-brittleness organic filaments (such as linen and bamboo viscose filaments) and high-strength and high-brittleness composite filaments. By optimizing the device structure and processing parameters, the present invention effectively addresses the issues of breakage, low production efficiency, and unstable product quality associated with traditional two-for-one twisting of these high-strength and high-brittleness filaments, proving promising for widespread application.

[0039] Compared with the existing technology, it has the following beneficial effects:

[0040] 1) The present invention significantly reduces the breakage rate of high-rigidity and high-brittleness filaments during the two-for-one twisting process by optimizing the design of the balloon control device and the yarn inlet.

[0041] 2) This invention significantly improves the production efficiency and product quality of high-strength, high-brittleness filaments by optimizing the device structure and processing parameters. The optimized design of the balloon control device and the yarn inlet ensures filament stability during processing, reduces downtime due to end breakage, and significantly improves production efficiency. Furthermore, optimized processing parameters (such as twist direction, twist, spindle speed, winding speed, and winding angle) better adapt to the characteristics of high-strength, high-brittleness filaments, ensuring that the filaments maintain good flexibility and strength during processing, further improving product quality.

[0042] 3) The device of the present invention has wide applicability and universality, and is suitable for the two-for-one twisting processing of various high-rigidity and high-brittleness filaments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic structural diagram of the chemical fiber two-for-one twisting machine used in Example 1;

[0044] 1. Yarn inlet used in Example 1; 2. Bobbin upper connecting device; 3. Fixed base; 4. Winding bobbin; 5. Fixed base; 6. Connecting device; 7. Bobbin lower fixing device; 8. Twisting device; 9. Yarn feeder; 10. Spindle; 11. Transmission belt; 12. Balloon ring; A. Balloon control device used in Example 1;

[0045] Figure 2 This is a schematic structural diagram of the balloon control device A used in Example 2;

[0046] Balloon control device A; A-1, self-lubricating wire feeding ring; A-2, fixed ring; A-3, bearing;

[0047] Figure 3 This is a schematic structural diagram of the wire inlet 1 used in Example 1; DETAILED DESCRIPTION

[0048] The raw materials in the examples and comparative examples of the present invention are all commercially available products.

[0049] Example 1

[0050] A method for continuous two-for-one twisting of high-rigidity and high-brittleness filaments is as follows:

[0051] The original balloon control device of the TH-6 chemical fiber two-for-one twister produced by Zhejiang Titan Co., Ltd. was replaced with the following balloon control device A; the balloon control device A comprises an outer layer of a self-lubricating wire ring A-1, an inner layer of a fixed ring A-2, and a fixed connection to a fixed base 3; the self-lubricating wire ring A-1 is a graphite ring; the balloon control device A has an outer diameter of 52 mm, a thickness of 2.5 mm, and a semicircular edge with a curvature radius of 1.25 mm. High-rigidity and high-brittleness filaments cannot drive the outer self-lubricating wire ring to rotate; the balloon control device A is 18 mm above the top of the wire inlet 1;

[0052] The yarn inlet of the TH-6 chemical fiber two-for-one twister of Zhejiang Titan Co., Ltd. was replaced with the following yarn inlet 1, which is trumpet-shaped, with the trumpet mouth facing upward, the edge is arc-shaped, and the internal curvature radius is 7 mm.

[0053] Using the above-mentioned replaced TH-6 chemical fiber two-for-one twisting machine of Zhejiang Titan Co., Ltd., the 8tex, 80F basalt filament is unwound from the winding bobbin 4, first passes through the balloon control device A, then enters the yarn inlet 1, and then passes through the internal holes of the connecting device 2 on the bobbin, the fixed base 3, the winding bobbin 4, the fixed base 5, the connecting device 6, and the lower fixing device 7 of the bobbin, and is twisted and drawn out through the yarn mouth 9 on the twisting device 8, finally forming a balloon ring 12 from bottom to top, completing the stable two-for-one twisting process; wherein the twisting direction is S twist, the twist is 350T / m, the spindle 10 spindle speed is 4500rpm, the winding speed is 25.71m / min, the winding angle is 15.0°, and the size of the winding bobbin 4 is: inner diameter 37mm×outer diameter 42mm×length 320mm.

[0054] Example 2

[0055] A method for continuous doubling of high-rigidity and high-brittleness filaments is basically the same as that of Example 1, with the only difference being that the balloon control device A further comprises a bearing A-3, and the high-rigidity and high-brittleness filaments can drive the outer self-lubricating wire-cutting ring A-1 to rotate, and the self-lubricating wire-cutting ring A-1 is a graphite ring.

[0056] Example 3

[0057] A method for continuous twisting of high-rigidity and high-brittleness filaments is basically the same as that of Example 2, with the only difference being that the height of the balloon control device A from the top of the yarn inlet 1 is 10 mm.

[0058] Example 4

[0059] A method for continuous two-for-one twisting of high-rigidity and high-brittleness filaments is basically the same as that in Example 2, with the only difference being that the height of the balloon control device A from the top of the yarn inlet 1 is 26 mm.

[0060] Example 5

[0061] A method for continuous doubling of high-rigidity and high-brittleness filaments is basically the same as that of Example 2, with the only difference being that the filament inlet 1 is trumpet-shaped, with the trumpet mouth facing upward and the edge being arc-shaped, and the internal curvature radius being 12 mm.

[0062] Example 6

[0063] A method for continuous doubling of high-rigidity and high-brittleness filaments is basically the same as that of Example 2, with the only difference being that the filament inlet 1 is trumpet-shaped, with the trumpet mouth facing upward and the edge being arc-shaped, and the inner curvature radius being 2 mm.

[0064] Comparative Example 1

[0065] A method for continuous two-for-one twisting of high-rigidity and high-brittleness filaments is basically the same as that in Example 1, the only difference being that the yarn inlet 1 is changed to the original yarn inlet of the TH-6 chemical fiber two-for-one twister, which is a hollow cylindrical shape with an inner diameter of 3 mm.

[0066] Comparative Example 2

[0067] A method for continuous doubling of high-rigidity and high-brittleness filaments is basically the same as Example 1, the only difference being that the balloon control device A is replaced with the original balloon control device of the above-mentioned TH-6 chemical fiber doubling machine. The original balloon control device has an upper outer diameter of 44 mm, a lower outer diameter of 49 mm, and a thickness of 2.5 mm, with a smooth transition between the upper and lower parts. The high-rigidity and high-brittleness filaments cannot drive the outer aluminum alloy ring to rotate, and the height of the original balloon control device from the top of the yarn inlet 1 is set to 18 mm.

[0068] Comparative Example 3

[0069] A method for continuous two-for-one twisting of high-strength and high-brittleness filaments is substantially the same as that of Example 1, except that the balloon control device A is replaced with the original balloon control device of the TH-6 chemical fiber two-for-one twister. The original balloon control device has an upper outer diameter of 44 mm, a lower outer diameter of 49 mm, a thickness of 2.5 mm, and a smooth transition between the upper and lower portions. The high-strength and high-brittleness filaments cannot drive the outer aluminum alloy ring to rotate. The height of the original balloon control device from the top of the yarn inlet 1 is set to 18 mm.

[0070] The yarn inlet 1 is changed to the original yarn inlet of the TH-6 chemical fiber two-for-one twister, which is a hollow cylindrical shape with an inner diameter of 3 mm.

[0071] Test Example 1

[0072] End breakage rate test:

[0073] The method of continuous doubling of high-rigidity and high-brittleness filaments in the embodiment and the comparative example was adopted. Under the conditions of temperature 25±2°C and humidity 65±5%, the ends were immediately connected after each breakage. The time not connected after the breakage was not included in the total test time. The test time was 120 minutes per case. Ten random spindle positions were used in each case, and the average value was taken as the final result.

[0074] The calculation formula of broken ends rate:

[0075] Breakage rate (times / 10,000 meters) = total number of breaks / total running length (meters) × 10,000

[0076] Total running length = winding speed × test time

[0077] The test results are shown in Table 1.

[0078] Table 1

[0079] Experimental plan End breakage rate (times / 10,000 meters) Example 1 0.8 Example 2 0.3 Example 3 1.2 Example 4 0.8 Example 5 0.7 Example 6 1.0 Comparative Example 1 4.8 Comparative Example 2 7.6 Comparative Example 3 Frequent breaks and inability to twist continuously

[0080] According to research on material mechanics and the fracture mechanism of high-rigidity and high-brittleness filaments, the core indicator of stress concentration fracture of high-rigidity and high-brittleness filaments (such as basalt fiber and ceramic fiber) during bending is bending strain, which is quantified by the following formula:

[0081] The calculation formula of bending strain ε is:

[0082] ε=d / 2R

[0083] Where:

[0084] d: fiber diameter (unit: mm)

[0085] R: Bending radius (i.e. the curvature radius of the bending arc, unit: mm)

[0086] When the diameter d of the high-strength and high-brittleness filament is fixed, the bending radius R is the core factor determining the risk of fracture: the smaller the bending radius R, the greater the degree to which the outer material of the high-strength and high-brittleness filament is forced to stretch when it is bent, and the resulting tensile stress increases sharply; once this stress exceeds the fracture strength limit of the high-strength and high-brittleness filament itself (brittle materials lack the ability to plastically deform), the molecular bonding structure on the outside of the high-strength and high-brittleness filament will instantly collapse and break.

[0087] The core advantage of Example 2 over Example 1 is that when the air ring control device adopts a bearing-type disc structure, the high-rigidity and high-brittleness filament drives the outer self-lubricating wire-cutting ring to rotate synchronously, so that the relative speed of the filament and the contact surface of the self-lubricating wire-cutting ring is reduced, and the dynamic friction is converted into rolling friction, the friction coefficient is reduced, and the friction heat generation is reduced. At the same time, the micro-scraping damage to the surface of the filament by the self-lubricating wire-cutting ring is avoided, thereby reducing the breakage rate of the basalt filament from 0.8 times / 10,000 meters to 0.3 times / 10,000 meters (a decrease of 67%).

[0088] The height of the balloon device in Example 2 is more appropriate than that in Example 3 and Example 4. When the height of the balloon control device is 18 mm (Example 2), the bending curvature radii of the high-rigidity and high-brittleness filament in the balloon section and the filament inlet section are simultaneously optimized to form a smooth transition; while Example 3 (height 10 mm) forces the bending radius of the upper balloon section of the balloon control device to be reduced, and Example 4 (height 26 mm) causes the bending angle of the lower balloon section of the balloon control device to be reduced. Both exceed the critical stress gradient threshold, resulting in an increase in the breakage rate.

[0089] The difference between Example 2 and Example 5 and Example 6 may be the precise balance between bending strain and frictional heat. When the internal curvature radius of the wire inlet is 7 mm (Example 2), the bending strain is low and the contact area is moderate, achieving dual optimization of mechanical safety and thermal stability; while in Example 5 (curvature radius of 12 mm), although the bending strain is reduced, the contact area is increased, the probability of micro-scraping damage to the surface of the high-rigidity and high-brittle filament is increased, and the frictional heat is increased, causing thermal breakage; Example 6 (curvature radius of 2 mm) increases the bending strain, the contact pressure becomes larger, and the breakage rate increases.

Claims

1. A high-rigidity and high-brittleness filament continuous two-for-one twisting device, characterized in that: include: Yarn inlet (1): located above the filament twisting device, serving as the entrance for high-strength and high-brittle filaments to enter the twisting device; The connecting device (2) on the yarn tube is connected to the yarn inlet (1) and the fixed base (3); Winding tube (4): stores the package of raw yarn; Fixed base (5): a base supporting the winding bobbin (4); Connecting device (6): connecting the fixed base (5) and the lower fixing device (7) of the bobbin; The lower fixing device (7) of the bobbin is used to fix the lower bracket of the winding bobbin (4); Twisting device (8): core twisting mechanism, fixedly connected to the spindle (10); Spindle (10): driven to rotate by a transmission belt (11); Yarn mouth (9): It is installed on the twisting device (8) to guide the high-rigidity and high-brittleness filaments in and out; Balloon ring (12): a circular track formed when high-strength and high-brittleness filaments are twisted; Balloon control device (A): Its outer diameter is 50-55mm, thickness is 2-3mm, edge is semicircular arc, curvature radius of semicircular arc is 2-3mm, and height can be adjusted up and down.

2. The device according to claim 1, wherein: The outer layer of the air ring control device (A) is a self-lubricating wire-cutting ring (A-1), and the interior contains a fixed ring (A-2), which is fixedly connected to a fixed base (3). The self-lubricating wire-cutting ring (A-1) is one of a graphite ring, a self-lubricating ceramic ring, a self-lubricating plastic ring, and a lubricating metal ring.

3. The device according to claim 2, characterized in that: The outer layer of the balloon control device (A) is a self-lubricating wire-cutting ring (A-1), and the interior contains a fixed ring (A-2) fixedly connected to the fixed base (3). The balloon control device (A) also contains a bearing (A-3). The high-rigidity and high-brittleness filament can drive the outer layer of the self-lubricating wire-cutting ring to rotate. The self-lubricating wire-cutting ring (A-1) is one of a graphite ring, a self-lubricating ceramic ring, a self-lubricating plastic ring, and a lubricating metal ring.

4. The device according to claim 1, wherein: The height of the balloon control device (A) from the top of the wire inlet (1) is 1-30 mm.

5. The device according to claim 4, characterized in that: The height of the balloon control device (A) from the top of the wire inlet (1) is 15-20 mm.

6. The device according to claim 1, wherein: The wire inlet (1) is in the shape of a trumpet, with the trumpet mouth facing upwards and an arc-shaped edge, and the inner curvature radius is 1-15 mm.

7. The device according to claim 6, characterized in that: The wire inlet (1) is in the shape of a trumpet, with the trumpet mouth facing upwards and an arc-shaped edge, and the inner curvature radius is 5-10 mm.

8. A method for processing high-rigidity and high-brittleness filaments using the device according to any one of claims 1 to 7, characterized in that: include: After the high-strength and high-brittleness filament is unwound from the winding tube (4), it first passes through the balloon control device (A), then enters the yarn inlet (1), and then passes through the internal holes of the connecting device (2) on the yarn tube, the fixed base (3), the winding tube (4), the fixed base (5), the connecting device (6), and the fixing device (7) under the yarn tube, and is twisted through the yarn mouth (9) on the twisting device (8), and finally forms an balloon ring (12) from bottom to top, completing the stable twisting process.

9. Use of the device according to any one of claims 1 to 7, characterized in that: The invention is applied to the two-for-one twisting process of high-rigidity and high-brittleness filaments, wherein the high-rigidity and high-brittleness filaments are at least one of inorganic non-metallic filaments, organic filaments and composite filaments.

10. The use according to claim 9, characterized in that: The high-strength and high-brittleness inorganic non-metallic filaments include basalt fibers, glass fibers, carbon fibers, alumina fibers, silicon carbide fibers, quartz fibers, boron fibers, and silicon nitride fibers; the high-strength and high-brittleness organic filaments include hemp-viscose filaments and bamboo-viscose filaments; the high-strength and high-brittleness composite filaments include composite filaments of high-strength and high-brittleness inorganic non-metallic filaments and various organic filaments.

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