High-brittleness aluminum oxide one-way large tow forming equipment

Abstract

The utility model discloses high-brittleness alumina one-way large tow forming equipment, which belongs to the technical field of alumina fiber forming and comprises an unwinding mechanism, a no-twist yarn collecting mechanism, a yarn spreading mechanism, a traction let-off mechanism, a gum dipping thermal forming mechanism and a winding mechanism. The yarn spreading mechanism comprises four vibrating rollers which are sequentially arranged from top to bottom, and the circle centers of the cross sections of the four vibrating rollers are alternately distributed left and right; and the vibration roller is used for unfolding the gathered alumina fiber large tows through vibration during axial reciprocating motion. Pressure is applied to the alumina fiber large tows through a series of vibration rollers, transverse displacement of the alumina fiber large tows is achieved, and therefore the fiber tows are widened and thinned. Through the synergistic effect of a plurality of vibration rollers, the alumina fiber large tows are uniformly spread to the required width, so that the consistency of resin infiltration and fiber distribution is ensured, the uniformity and consistency of the tows are ensured, and the overall uniformity of alumina fiber wide strips after subsequent curing molding can be improved.

Description

Technical Field

[0001] This utility model relates to a high-brittleness alumina unidirectional large filament forming equipment, belonging to the field of alumina fiber forming technology. Background Technology

[0002] With technological advancements and evolving consumer demands, the selection of backplane materials for 3C products (computers, communications, and consumer electronics) is constantly evolving. Given the stringent signal transmission requirements of 5G communication, new demands are being placed on the materials used in communication equipment. Metal backplanes, due to their signal shielding effect, may gradually be phased out. In this context, ceramic, carbon fiber, and glass materials have become popular alternatives to metal.

[0003] While carbon fiber materials are ideal for thin and portable 3C electronic products due to their lightweight, high strength, and high modulus, their structure and manufacturing methods can lead to electromagnetic shielding properties in certain applications, particularly for 3C products requiring wireless communication and electromagnetic wave transmission. This electromagnetic shielding can hinder signal transmission and affect product performance. Quartz fiber, with its unique physical and chemical properties, offers significant advantages in the backplane applications of 3C electronic products, especially in terms of wave transmission. Quartz fiber possesses excellent dielectric properties, making it an ideal wave-transmitting material for high-frequency communication equipment, ensuring efficient signal transmission. However, its relatively low modulus means weaker bending resistance. In applications requiring high-strength support, combining it with other materials may be necessary to improve overall mechanical strength.

[0004] In this context, ceramic fiber materials can be seen as a performance-enhanced version of glass fiber materials. Due to their high hardness, strong wear resistance, lack of signal shielding, and excellent heat dissipation, ceramic materials are considered ideal materials for mobile phone back panels in the 5G era. Alumina fiber materials, in particular, offer several advantages in 3C product back panel applications: First, their mechanical properties are far superior to glass fiber. Alumina fiber has a lower density (2.7–4.2 g / cm³). 3 It possesses high specific strength and high specific modulus, with a fracture toughness up to twice that of glass fiber, and also high hardness, making it far more wear-resistant than glass fiber. This makes backsheets made from it both lightweight and possess sufficient mechanical strength. Secondly, it has stable chemical properties and is resistant to acid and alkali corrosion. Thirdly, it has good dielectric properties, low dielectric loss, and minimal electromagnetic shielding effect, meaning it does not shield signals and is superior to glass fiber, making it suitable for the requirements of 5G communication and wireless charging technologies.

[0005] However, alumina fibers face several technical challenges in the manufacturing of back panel materials for 3C products due to their brittleness and fine filament characteristics. Firstly, the brittle nature of alumina fiber yarns makes them prone to breakage during processing. Uniform tension must be maintained throughout the process; otherwise, broken fibers will accumulate, impacting production efficiency. Secondly, when using very fine alumina fiber bundles for unidirectional stretching and pre-impregnation, the numerous gaps between fibers affect material uniformity, significantly impacting product appearance and mechanical properties. Utility Model Content

[0006] To solve at least one of the above problems, this utility model provides a high-brittleness alumina unidirectional large filament forming device.

[0007] As one aspect of this utility model, a high-brittleness alumina unidirectional large filament forming device is provided, comprising: an unwinding mechanism, a non-twisted yarn collecting mechanism, a yarn spreading mechanism, a drawing and feeding mechanism, an adhesive-impregnated thermoforming mechanism, and a winding mechanism arranged sequentially; the unwinding mechanism is used to release the alumina fiber large filament bundle to the non-twisted yarn collecting mechanism, the non-twisted yarn collecting mechanism is used to collect the alumina fiber large filament bundle according to a predetermined process track and then feed the alumina fiber large filament bundle into the yarn spreading mechanism, the yarn spreading mechanism is used to spread and flatten the collected alumina fiber large filament bundle to obtain alumina fiber fine filament bundles, the drawing and feeding mechanism is used to draw the alumina fiber fine filament bundles to the adhesive-impregnated thermoforming mechanism, the adhesive-impregnated thermoforming mechanism is used to impregnate the alumina fiber fine filament bundles with adhesive and then heat and cure them to obtain alumina fiber wide strips, and the winding mechanism is used to wind and collect the alumina fiber wide strips.

[0008] The yarn unfolding mechanism includes four vibrating rollers arranged sequentially from top to bottom, with the centers of the cross-sections of the four vibrating rollers alternating left and right. The vibrating rollers are used to unfold the large bundle of alumina fibers by vibrating while moving axially back and forth.

[0009] Furthermore, the vibrating roller is made of ceramic.

[0010] Furthermore, the unwinding mechanism includes an unwinding device and a yarn limiting device arranged in sequence. The unwinding device is used to release the large bundle of alumina fibers to the untwisted yarn gathering mechanism, and the yarn limiting device is used to limit the large bundle of alumina fibers to maintain a predetermined width within the track according to the width of the alumina fiber bundle.

[0011] The yarn limiting device includes a limiting rod and two oppositely arranged limiting plates. The two limiting plates are provided with a plurality of limiting eyes. The two ends of the limiting rod are axially slidably connected to the two limiting plates through a pair of corresponding limiting eyes on the two limiting plates.

[0012] Furthermore, the unwinding mechanism also includes a constant tension yarn frame and a heating roller, which are sequentially arranged between the yarn limiting device and the yarn collecting mechanism.

[0013] Furthermore, the untwisted yarn collecting mechanism includes two horizontally arranged yarn collecting rods, which are parallel in the same vertical plane and form a gap between them to allow large bundles of alumina fibers to pass through.

[0014] Furthermore, a yarn path detection and adjustment mechanism is provided between the dip-coating thermoforming mechanism and the winding mechanism. The yarn path detection and adjustment mechanism is used to detect the position offset information of the alumina fiber strip and to adjust the alumina fiber strip to the target track according to the position offset information.

[0015] Furthermore, the yarn path detection and adjustment mechanism includes a laser detection device and a first tension adjustment system, which are communicatively connected;

[0016] The laser detection device is used to emit a laser beam to detect the positional offset information of the wide strips of alumina fibers;

[0017] The first tension adjustment system includes a first controller, a first tension sensor, a first lead wheel, and a first drive motor; the first tension sensor and the first drive motor are both communicatively connected to the first controller, and the first drive motor drives the first lead wheel.

[0018] The first tension sensor is used to monitor the tension of the alumina fiber strip between the dip-molding thermoforming mechanism and the winding mechanism in real time;

[0019] The first controller is used to generate a first control signal based on the tension and positional offset information of the alumina fiber strip between the dip-molding thermoforming mechanism and the winding mechanism;

[0020] The first drive motor is used to drive the first lead wheel after speed adjustment according to the first control signal to adjust the tension of the alumina fiber strip between the dip-molding thermoforming mechanism and the winding mechanism;

[0021] The first guide wheel is used to guide the wide strip of alumina fiber into the winding mechanism.

[0022] Furthermore, a second tension adjustment system is provided between the untwisted yarn gathering mechanism and the yarn spreading mechanism. The second tension adjustment system includes a second controller, a second tension sensor, a second lead wheel, and a second drive motor.

[0023] The second tension sensor is used to monitor the tension of the alumina fiber bundle between the untwisted yarn gathering mechanism and the yarn spreading mechanism in real time.

[0024] The second controller is used to generate a second control signal based on the tension of the large alumina fiber bundle between the untwisted yarn gathering mechanism and the yarn spreading mechanism;

[0025] The second drive motor is used to drive the second lead wheel after speed adjustment according to the second control signal to adjust the tension of the large alumina fiber bundle between the untwisted yarn gathering mechanism and the yarn spreading mechanism.

[0026] The second guide wheel is used to guide the large bundle of alumina fibers into the yarn spreading mechanism.

[0027] Advantages of this utility model:

[0028] (1) The high-brittleness alumina unidirectional large tow forming device provided by this utility model applies pressure to the alumina fiber large tow through a series of vibrating rollers in the yarn spreading mechanism, thereby achieving lateral displacement of the alumina fiber large tow and making the fiber tow wider and thinner. Through the synergistic action of multiple vibrating rollers, the alumina fiber large tow can be evenly spread to the required width, ensuring the consistency of resin impregnation and fiber distribution, guaranteeing the uniformity and consistency of the tow, and improving the overall uniformity of the alumina fiber wide strip after subsequent curing. Moreover, the vibrating roller shafts in the yarn spreading mechanism are all made of ceramic material, which can reduce the wear of the alumina fiber large tow during the widening process and prevent fiber breakage.

[0029] (2) The high brittle alumina unidirectional large filament forming equipment provided by this utility model is based on the brittle characteristics of alumina fiber yarn. It is equipped with a yarn limiting device, a first tension control system, a second tension control system and a yarn path detection and adjustment mechanism, which can effectively ensure the uniformity of tension, the consistency of width and the stability of winding of alumina yarn.

[0030] (3) Compared with the production of small-tow alumina continuous fibers by unidirectional stretching and impregnation curing before preparing fiber strips, the high brittle alumina unidirectional large tow forming equipment provided by this utility model can achieve more precise control in the manufacturing process of the forming device, the overall uniformity of the prepared material is higher, and the process has better adaptability and adjustability, and can better reduce process costs.

[0031] (4) The high-brittleness alumina unidirectional large filament forming equipment provided by this utility model can achieve continuous production and improve production efficiency in actual production processes. Compared with the traditional single-roller winding, the multi-roller winding method composed of four vibrating rollers can process alumina fiber filaments faster, shorten the production cycle, and achieve larger-scale production and industrial application under the same time efficiency conditions. Attached Figure Description

[0032] Figure 1 This is a simplified structural diagram of a high-brittleness alumina unidirectional large filament forming device provided in Embodiment 1 of this utility model. Detailed Implementation

[0033] The following is a detailed description of this utility model.

[0034] Example 1:

[0035] like Figure 1 As shown, this utility model embodiment provides a high-brittleness alumina unidirectional large filament forming device, including: an unwinding mechanism, a non-twisted yarn collecting mechanism 7, a yarn spreading mechanism 9, a drawing and feeding mechanism 11, a resin impregnation thermoforming mechanism, and a winding mechanism 17 arranged sequentially; the unwinding mechanism is used to release the alumina fiber large filament bundle 2 to the non-twisted yarn collecting mechanism 7, the non-twisted yarn collecting mechanism 7 is used to collect the alumina fiber large filament bundle 2 according to a predetermined process track and then feed the alumina fiber large filament bundle 2 into the yarn spreading mechanism 9, the yarn spreading mechanism 9 is used to spread and flatten the collected alumina fiber large filament bundle 2 to obtain alumina fiber fine filament bundles, the drawing and feeding mechanism 11 is used to pull the alumina fiber fine filament bundles to the resin impregnation thermoforming mechanism, the resin impregnation thermoforming mechanism is used to impregnate the alumina fiber fine filament bundles with adhesive and then heat and cure them to obtain alumina fiber wide strips, and the winding mechanism 17 is used to wind and collect the alumina fiber wide strips.

[0036] The yarn unfolding mechanism 9 includes four vibrating rollers 10 arranged sequentially from top to bottom, with the centers of the cross-sections of the four vibrating rollers 10 alternately distributed to the left and right; the vibrating rollers 10 are used to unfold the aggregated alumina fiber bundles 2 by vibrating while moving axially back and forth.

[0037] In this embodiment of the invention, the alumina fiber bundle 2 is released from the unwinding mechanism. First, it passes through the untwisted yarn gathering mechanism 7 to gather the alumina fiber bundle 2 according to a predetermined process track and then sends it into the yarn spreading mechanism 9. The yarn spreading mechanism 9 adopts a multi-roller winding method, including four independently controlled vibrating rollers 10. By precisely controlling the axial displacement, speed and vibration frequency of the vibrating rollers 10, the wrapping angle and tension of the alumina fiber bundle 2 when it passes through the vibrating rollers 10 can be adjusted. At the same time, the high-frequency vibrating rollers 10 work in conjunction with a vibrating motor to ensure that the fiber bundle can spread evenly during the high-frequency vibration process when it passes through the roller surface, thus controlling the degree of fiber spreading. The specific settings and adjustments need to be determined based on actual production needs and the characteristics of alumina yarn products. The alumina fiber bundle 2 is sequentially moved and vibrated axially by four vibrating rollers 10 arranged from top to bottom through the yarn spreading mechanism 9, causing each alumina fiber bundle 2 to produce a lateral displacement, making the alumina fiber bundle 2 2-3 times wider and flattened. Each alumina fiber bundle 2 can be spread from 3mm to 8mm, thereby achieving the widening and thinning of the alumina fiber bundle 2, ensuring that each yarn is fully in contact with the yarn spreading device, evenly distributed, without overlapping yarn, and facilitating subsequent processing.

[0038] Next, the alumina fiber bundles from the yarn spreading mechanism 9 are fed into the drawing and feeding mechanism 11. The drawing and feeding mechanism 11 pulls the alumina fiber bundles to the impregnation and thermoforming mechanism. This provides power for the conveying of the alumina fiber bundles and reduces the tension on the alumina fiber bundles from subsequent mechanisms, significantly reducing the tension on the alumina fiber bundles. This ensures that the tension and speed of the alumina fiber bundles during conveying meet process requirements, thereby reducing fiber breakage. When the drawing and feeding mechanism 11 pulls the alumina fiber... After the alumina fiber bundles are fed into the resin or other adhesive in the resin impregnation tank 12 of the resin impregnation thermoforming mechanism, they are immersed in the resin to enhance the bonding force and performance between the yarns. The resin-impregnated alumina fiber bundles are then heated and cured by the heating device 13 of the resin impregnation thermoforming mechanism. The heating device 13 is specifically a heating roller 14. The resin impregnation and heating curing can enhance the overall performance of the fiber and obtain alumina fiber strips. Finally, the alumina fiber strips are sent to the winding mechanism 17, which winds and collects the alumina fiber strips on a turntable for easy subsequent storage and use.

[0039] Furthermore, the vibrating roller 10 is made of ceramic. The ceramic vibrating roller 10 can reduce the wear of the yarn during the spreading process, thereby reducing the possibility of yarn breakage.

[0040] Furthermore, the unwinding mechanism includes an unwinding device 1 and a yarn limiting device 3 arranged in sequence. The unwinding device 1 is used to release the alumina fiber bundle 2 to the untwisted yarn gathering mechanism 7, and the yarn limiting device 3 is used to limit the alumina fiber bundle to maintain a predetermined width within the track according to the width of the alumina fiber bundle.

[0041] The yarn limiting device 3 includes a limiting rod and two opposing limiting plates. The two limiting plates are provided with a plurality of limiting holes. The two ends of the limiting rod are axially slidably connected to the two limiting plates through the limiting holes on the two limiting plates respectively.

[0042] In this embodiment of the invention, the distance between the two limiting plates is adjusted along the axial direction of the limiting rod, so that the two limiting plates can limit the large alumina fiber bundle at the edge of the warp beam. In addition, each limiting plate in this embodiment of the invention is provided with two limiting eyes corresponding to each other. By setting the limiting rod between the upper set of limiting eyes or between the lower set of limiting eyes, the height of the limiting rod can be adjusted to provide different tensions to the large alumina fiber bundle, so that the yarn is evenly distributed after being released by the unwinding device 1, avoiding yarn stacking or excessive dispersion, thereby achieving balanced yarn stacking and ensuring that the bundle remains concentrated after unwinding. It should be understood that the number of limiting eyes on the limiting plate can be set according to specific needs, and multiple sets of limiting eyes can be further set to allow for fine adjustment of the height of the limiting rod, thereby achieving further adjustment of the tension of the large alumina fiber bundle before and after the yarn limiting device 3.

[0043] Because the alumina fiber bundle 2 uses multiple strands (≥4 strands) of yarn during the spreading process, after the alumina fiber bundle 2 is released from the yarn bundle roll of the unwinding mechanism, it first passes through the yarn limiting device 3 and then enters the untwisted yarn collecting mechanism 7, which can ensure the uniformity of the fiber spreading process and effectively avoid production abnormalities such as yarn overlap and gaps.

[0044] Furthermore, the unwinding mechanism also includes a constant tension yarn frame 4 and a heating roller 5, which are sequentially arranged between the yarn limiting device 3 and the yarn collecting mechanism.

[0045] The constant tension yarn holder 4 is used to maintain a constant yarn tension to ensure yarn quality during the textile process. Specifically, the constant tension yarn holder 4 includes:

[0046] Yarn frame outer frame: As the basic structure of the entire yarn frame, it supports other components;

[0047] Yarn bobbin and yarn bobbin drive device: The yarn bobbin is used to store yarn, and the yarn bobbin drive device (such as a stepper motor or servo motor) is connected to the yarn bobbin and drives the yarn bobbin to rotate, thereby releasing the yarn from the yarn bobbin;

[0048] Yarn guiding assembly: including yarn guiding rod, correction guide wheel, first yarn guiding wheel, second yarn guiding wheel and yarn guiding tube, used to guide the yarn from the yarn bobbin to subsequent textile equipment;

[0049] Suction fan: Fixedly installed at the bottom inside the outer frame of the yarn frame, connected to the constant tension control mechanism, and assists in controlling the tension of the yarn by generating constant suction;

[0050] Constant tension control mechanism: Communicatively connected to the yarn guide assembly, used to control the tension of the yarn as it passes through the yarn guide assembly. In this embodiment of the invention, the mechanism may include a tension guide wheel and an open-top and closed-top fan hood. The bottom of the fan hood is connected to a suction fan, and the suction force controls the up-and-down movement of the tension guide wheel, thereby maintaining a constant yarn tension.

[0051] Servo motor: Fixedly installed inside the outer frame of the yarn frame, located above the suction fan, and connected to the output shaft of the carbon fiber yarn tube for precise control of the unwinding speed of the yarn;

[0052] Yarn storage unit: Each yarn rack includes multiple yarn storage units. Each yarn storage unit includes a frame support, a spindle mounting rod, multiple miniaturized yarn storage spindles, and a tensioner for storage and tension control.

[0053] Yarn separating grids and yarn guide ceramic eyes: used to orderly separate and guide yarns, ensuring that the yarns are correctly delivered from the yarn storage unit to the textile equipment.

[0054] In this embodiment, a constant tension yarn frame 4 can draw 6-8 strands of 3mm unidirectional alumina fiber bundles 2 from the yarn limiting device 3 and pass them through a set of heating rollers 5. The constant tension yarn frame 4 is used to provide the alumina fiber bundles 2 with tension within a preset range when the unwinding device 1 releases the alumina fiber bundles 2. The heating rollers 5 are used to heat the alumina fiber bundles 2 to soften the sizing agent on the fiber surface, so as to facilitate better spreading of the alumina fiber bundles 2 and improve the uniformity of spreading.

[0055] Furthermore, the untwisted yarn collecting mechanism 7 includes two horizontally arranged yarn collecting rods 6, which are parallel in the same vertical plane and form a gap between them to allow the large bundle of alumina fibers 2 to pass through.

[0056] In this embodiment of the invention, a gap is provided between the two yarn collecting rods 6 to allow 6-8 strands of 3mm alumina fiber bundles 2 to pass through the cylindrical surface of the two yarn collecting rods 6. This can simultaneously prevent the alumina fiber bundles 2 from twisting during the collecting process, thus avoiding affecting subsequent processing.

[0057] Furthermore, a yarn path detection and adjustment mechanism is provided between the dip-impregnation thermoforming mechanism and the winding mechanism 17. The yarn path detection and adjustment mechanism is used to detect the position offset information of the alumina fiber strip and to adjust the alumina fiber strip to the target track according to the position offset information.

[0058] Specifically, the alumina fiber strips from the dip-resin thermoforming mechanism are sent to the yarn path detection and adjustment mechanism. The yarn path detection and adjustment mechanism can actively detect the final forming width of the alumina fiber strips and correct the yarn path to ensure that the error between the actual center axis of the alumina fiber strips and the preset center axis is within the preset error range, thereby improving the width uniformity of the alumina fiber strips after widening and enabling the alumina fiber strips to achieve the required physical and chemical properties.

[0059] Furthermore, the yarn path detection and adjustment mechanism includes a laser detection device 15 and a first tension adjustment system 16, which are communicatively connected.

[0060] Laser detection device 15 is used to emit a laser beam to detect the positional offset information of the alumina fiber strips;

[0061] Specifically, two laser emitters are positioned on either side of an alumina fiber strip, allowing their emitted laser beams to pass through the alumina fiber strip and form light spots on the opposite side. Detectors are placed on both sides of the alumina fiber strip to receive the light spots formed by the laser beams passing through the strip and to calculate the positional offset of the spot center. By measuring the positional offset of the center of the light spots formed by the two laser beams on either side of the alumina fiber strip, the width of the alumina fiber strip can be calculated. If the positional offset of the spot center differs from the expected position, it indicates that the alumina fiber strip has been misaligned. The tension of the alumina fiber strip is adjusted by a first tension adjustment system 16 to return the alumina fiber strip to the correct path.

[0062] The first tension adjustment system 16 includes a first controller, a first tension sensor, a first lead wheel, and a first drive motor; the first tension sensor and the first drive motor are both communicatively connected to the first controller, and the first drive motor drives the first lead wheel.

[0063] The first tension sensor is used to monitor the tension of the alumina fiber strip between the dip-molding thermoforming mechanism and the winding mechanism 17 in real time.

[0064] The first controller is used to generate a first control signal based on the tension and position offset information of the alumina fiber strip between the dip-molding thermoforming mechanism and the winding mechanism 17;

[0065] The first drive motor is used to drive the first lead wheel after speed adjustment according to the first control signal to adjust the tension of the alumina fiber strip between the dip-impregnation thermoforming mechanism and the winding mechanism 17.

[0066] The first guide wheel is used to guide the wide strip of alumina fiber into the winding mechanism 17.

[0067] Except when the position of the alumina fiber strip deviates, the tension needs to be adjusted by the first tension adjustment system 16 to bring the alumina fiber strip back to the correct path. The first tension adjustment system 16 itself will measure and feed back the actual tension value of the alumina fiber strip to the first controller in real time through the first tension sensor. The first controller compares the actual tension value with the set value, generates and outputs the first control signal based on the difference between the two to control the first drive motor to adjust the speed of the first lead wheel, and then adjusts the speed of the winding mechanism 17 to adjust the tension so that the actual tension is equal to the given tension.

[0068] Furthermore, a second tension adjustment system 8 is provided between the untwisted yarn gathering mechanism 7 and the yarn spreading mechanism 9. The second tension adjustment system 8 includes a second controller, a second tension sensor, a second lead wheel, and a second drive motor.

[0069] The second tension sensor is used to monitor the tension of the alumina fiber bundle 2 between the untwisted yarn gathering mechanism 7 and the yarn spreading mechanism 9 in real time.

[0070] The second controller is used to generate a second control signal based on the tension of the alumina fiber bundle 2 between the untwisted yarn gathering mechanism 7 and the yarn spreading mechanism 9;

[0071] The second drive motor is used to drive the second lead wheel after speed adjustment according to the second control signal to adjust the tension of the alumina fiber bundle 2 between the untwisted yarn gathering mechanism 7 and the yarn spreading mechanism 9;

[0072] The second guide wheel is used to guide the large alumina fiber bundle 2 into the yarn spreading mechanism 9.

[0073] Specifically, in this embodiment of the present invention, after the alumina fiber bundle 2 is gathered by the untwisted yarn gathering mechanism 7, the second tension sensor monitors the tension of the alumina fiber bundle 2 in real time and feeds it back to the second controller in real time. The second controller adjusts the speed of the second guide wheel according to the feedback tension value so that the tension of the alumina fiber bundle 2 reaches the ideal state, thereby achieving uniform widening and ensuring yarn spreading stability. The working principle of the second tension adjustment system 8 can refer to the working principle of the first tension adjustment system 16, and will not be described in detail here.

[0074] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A unidirectional large tow forming device for high-brittle alumina, characterized in that, include: The system comprises, in sequence, an unwinding mechanism, a non-twisted yarn gathering mechanism, a yarn spreading mechanism, a drawing and feeding mechanism, a resin-impregnated thermoforming mechanism, and a winding mechanism. The unwinding mechanism releases large bundles of alumina fibers to the non-twisted yarn gathering mechanism. The non-twisted yarn gathering mechanism gathers the large bundles of alumina fibers according to a predetermined process track and then feeds them into the yarn spreading mechanism. The yarn spreading mechanism spreads and flattens the gathered large bundles of alumina fibers to obtain fine bundles of alumina fibers. The drawing and feeding mechanism pulls the fine bundles of alumina fibers to the resin-impregnated thermoforming mechanism. The resin-impregnated thermoforming mechanism impregnates the fine bundles of alumina fibers with an adhesive and then heats and cures them to obtain wide strips of alumina fibers. The winding mechanism winds and collects the wide strips of alumina fibers. The yarn unfolding mechanism includes four vibrating rollers arranged sequentially from top to bottom, with the centers of the cross-sections of the four vibrating rollers alternately distributed to the left and right; the vibrating rollers are used to unfold the aggregated alumina fiber bundles by vibrating while moving axially back and forth.

2. The high-brittleness alumina unidirectional large tow forming equipment according to claim 1, characterized in that, The vibrating roller is made of ceramic.

3. The high-brittleness alumina unidirectional large tow forming equipment according to claim 1, characterized in that, The unwinding mechanism includes an unwinding device and a yarn limiting device arranged in sequence. The unwinding device is used to release the large alumina fiber bundle to the untwisted yarn gathering mechanism, and the yarn limiting device is used to limit the large alumina fiber bundle to maintain a predetermined width within the track according to the width of the alumina fiber bundle. The yarn limiting device includes a limiting rod and two oppositely arranged limiting plates. The two limiting plates are provided with a plurality of limiting eyes. The two ends of the limiting rod are axially slidably connected to the two limiting plates through a pair of corresponding limiting eyes on the two limiting plates.

4. The high-brittleness alumina unidirectional large tow forming equipment according to claim 3, characterized in that, The unwinding mechanism further includes a constant tension yarn frame and a heating roller, which are sequentially arranged between the yarn limiting device and the yarn collecting mechanism.

5. The high-brittleness alumina unidirectional large tow forming equipment according to claim 1, characterized in that, The untwisted yarn collecting mechanism includes two horizontally arranged yarn collecting rods, which are parallel in the same vertical plane and form a gap between them to allow large bundles of alumina fibers to pass through.

6. The high-brittleness alumina unidirectional large tow forming equipment according to claim 1, characterized in that, A yarn path detection and adjustment mechanism is provided between the dip-molding thermoforming mechanism and the winding mechanism. The yarn path detection and adjustment mechanism is used to detect the position offset information of the alumina fiber strip and to adjust the alumina fiber strip to the target track according to the position offset information.

7. The high-brittleness alumina unidirectional large tow forming equipment according to claim 6, characterized in that, The yarn path detection and adjustment mechanism includes a laser detection device and a first tension adjustment system, and the laser detection device and the first tension adjustment system are communicatively connected. The laser detection device is used to emit a laser beam to detect the positional offset information of the alumina fiber strips. The first tension adjustment system includes a first controller, a first tension sensor, a first lead wheel, and a first drive motor; the first tension sensor and the first drive motor are both communicatively connected to the first controller, and the first drive motor drives the first lead wheel. The first tension sensor is used to monitor the tension of the alumina fiber strip between the dip-molding thermoforming mechanism and the winding mechanism in real time; The first controller is used to generate a first control signal based on the tension of the alumina fiber strip between the dip-molding thermoforming mechanism and the winding mechanism and the position offset information; The first drive motor is used to drive the first lead wheel after speed adjustment according to the first control signal to adjust the tension of the alumina fiber strip between the dip-molding thermoforming mechanism and the winding mechanism; The first lead wheel is used to guide the wide strip of alumina fiber into the winding mechanism.

8. The high-brittleness alumina unidirectional large tow forming equipment according to claim 1, characterized in that, A second tension adjustment system is provided between the untwisted yarn gathering mechanism and the yarn spreading mechanism. The second tension adjustment system includes a second controller, a second tension sensor, a second lead wheel, and a second drive motor. The second tension sensor is used to monitor the tension of the alumina fiber bundle between the untwisted yarn gathering mechanism and the yarn spreading mechanism in real time; The second controller is used to generate a second control signal based on the tension of the alumina fiber bundle between the untwisted yarn gathering mechanism and the yarn spreading mechanism; The second drive motor is used to drive the second lead wheel after speed adjustment according to the second control signal to adjust the tension of the large alumina fiber bundle between the untwisted yarn gathering mechanism and the yarn spreading mechanism; The second guide wheel is used to guide the large bundle of alumina fibers into the yarn spreading mechanism.

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