Fiber prefabricated part weaving device

Abstract

The utility model discloses a fiber prefabricated part weaving device which comprises a yarn reversing mechanism, a weaving mechanism and a transfer mechanism, and the yarn reversing mechanism comprises an unwinding frame, a powder scattering mechanism, a yarn spreading mechanism, a heating mechanism, a cooling mechanism and a winding frame which are sequentially arranged. A large fiber spindle on the unwinding frame sequentially passes through the powder scattering mechanism, the yarn spreading mechanism, the heating mechanism and the cooling mechanism and then is wound on the winding frame to form a small fiber spindle. The knitting mechanism comprises a circular ring knitting machine and a mechanical arm, and the mechanical arm is used for driving a core shaft to move in a knitting ring of the circular ring knitting machine so as to form a prefabricated part wrapped with the core shaft; the transferring mechanism is arranged between the yarn reversing mechanism and the knitting mechanism and used for transferring the small fiber spindles to a yarn carrier of the circular ring knitting machine. Fiber accumulation is not prone to being generated, the fibers are in a sheet shape after being woven to the core mold to form the prefabricated part, the good and stable fiber width is kept, surface gaps of the prefabricated part are reduced, and consistency of the volume content of the formed fibers is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon fiber products, in particular to a fiber preform weaving device. Background Art

[0002] Traditional weaving technology generally uses circular braiding machines to produce similar tubular products such as hoses, ropes, and cables. The new two-dimensional weaving technology, based on the traditional weaving technology, uses a seven-axis robotic arm to clamp the core shaft to control the movement of the core shaft. By oriented along the molding direction of the preform, multiple yarns are tilted and crossed according to a certain rule, so that the yarns are intertwined and wrapped around the core shaft, thereby realizing the preparation of large-diameter and complex-shaped two-dimensional braided preforms.

[0003] At present, carbon fiber woven preforms, such as cylindrical preforms, propellers or landing gear, are produced using circular braiding machines in conjunction with seven-axis robotic arms. Dozens to hundreds of ingots of carbon fiber are needed to produce preforms. Each ingot will pass through many paths with variable angles and have a certain tension. The width of all fibers cannot be guaranteed to be consistent during the production process. Inconsistent fiber width will cause problems such as preform gaps and inconsistent fiber volume content after molding. Summary of the invention

[0004] The utility model aims to provide a fiber preform weaving device to solve the problem that fiber preforms produced by circular weaving machines in the prior art are prone to gaps.

[0005] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0006] The present application discloses a fiber preform weaving device, comprising:

[0007] The yarn rewinding mechanism comprises an unwinding frame, a powdering mechanism, a yarn spreading mechanism, a heating mechanism, a cooling mechanism and a winding frame which are arranged in sequence. The large fiber spindle on the unwinding frame passes through the powdering mechanism, the yarn spreading mechanism, the heating mechanism and the cooling mechanism in sequence and is then wound up on the winding frame to form a small fiber spindle.

[0008] A braiding mechanism, comprising a circular braiding machine and a mechanical arm, wherein the mechanical arm is used to drive a mandrel to move in a braiding ring of the circular braiding machine to form a preform wrapped with the mandrel;

[0009] The transfer mechanism is arranged between the yarn rewinding mechanism and the weaving mechanism, and is used for transferring the fiber spindles to the yarn carrier of the circular knitting machine.

[0010] Further, the powder spreading mechanism comprises a silo, a powder distributor for spreading powder onto the fibers, and two pressing rollers at the same level;

[0011] The outer circumferential surfaces of the two pressing rollers are tangent to each other, the material bin is located above the pressing rollers, and the powder distributor is located below the pressing rollers.

[0012] Furthermore, the yarn spreading mechanism comprises two tangent yarn spreading wheels, and the fibers pass through the two tangent yarn spreading wheels.

[0013] Furthermore, the heating mechanism is a heating lamp.

[0014] Furthermore, the cooling mechanism comprises two tangent metal rollers, and the fiber passes through the two tangent metal rollers.

[0015] Furthermore, it also includes a shaping component arranged on one side of the weaving mechanism;

[0016] The shaping component comprises a vacuum bag and an oven. The vacuum bag is detachably connected to the preform wrapped with the mandrel, and the oven is used to heat the preform with the vacuum bag.

[0017] Furthermore, a transfer mechanism is provided between the weaving mechanism and the shaping component, and the transfer mechanism is used to transfer the preform wrapped with the core shaft to the shaping component.

[0018] Furthermore, the transfer mechanism and the transport mechanism are both multi-axis robotic arms.

[0019] According to the above technical solution, the beneficial effects of this application are:

[0020] In the present application, the fibers are initially shaped by a yarn reversing mechanism before weaving. During the initial shaping process, powdering, heating and cooling are controlled to ensure the processing quality, dimensional stability and surface smoothness of the fiber material. The width of the initially shaped fiber yarn is stable and fiber accumulation is not easy to occur. After being woven onto a core mold to form a preform, the fibers are in sheet form, maintaining a good and stable fiber width, reducing surface gaps in the preform, and facilitating the consistency of the fiber volume content after molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall layout of the weaving device of the utility model;

[0022] Figure 2 This is a structural schematic diagram of the yarn reversing mechanism of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the circular knitting machine of the utility model;

[0024] Figure 4 It is a schematic diagram of the weaving mechanism of the utility model;

[0025] Figure 5 It is a flow chart of the knitting method of the utility model.

[0026] Among them: 100, yarn rewinding mechanism; 11, unwinding rack, 12, large fiber spindle, 13, powdering mechanism, 14, yarn spreading mechanism, 15, heating mechanism, 16, cooling mechanism, 17, winding rack, 18, small fiber spindle; 200, weaving mechanism; 21, circular braiding machine, 22, weaving ring, 23, yarn carrier, 24, core mold, 25, mechanical arm; 300, shaping component; 01, transfer mechanism; 02, transfer mechanism. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0028] It should be noted that in the description of the present invention, the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention rather than requiring that the present invention must be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. The terms "front", "rear", "left", "right", "up", and "down" used in the description of the present invention refer to the directions in the accompanying drawings, and the terms "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0029] A main purpose of the present application is to solve the problem that gaps are prone to occur in fiber preforms produced by circular braiding machines.

[0030] After the preform is produced, it needs to be removed from the core mold and then installed on a molding mold such as RTM for molding. However, it is generally difficult to demold during the demolding process. The fibers are easy to loosen and slip without the support of the core mold. After demolding, the preform cannot maintain its original shape and cannot be assembled on a molding mold such as RTM after demolding. Therefore, a further purpose of the present application is to solve the problem of easy slippage of fibers during demolding and difficulty in demolding.

[0031] In summary, the purpose of the present application is to reduce the surface gap of the woven preform, ensure that the fiber volume content at each position of the woven preform is basically consistent, and make it easy for the woven preform to separate from the core mold. After separating from the core mold, the preform can maintain its original shape intact, which is convenient for the operation of the next step.

[0032] like Figure 1-Figure 4As shown, the present application discloses a fiber preform weaving device, including a yarn rewinding mechanism, a weaving mechanism and a transfer mechanism, the yarn rewinding mechanism 100 includes a reeling frame 11, a powdering mechanism 13, a yarn spreading mechanism 14, a heating mechanism 15, a cooling mechanism 16 and a winding frame 17 which are arranged in sequence, the large fiber spindles 12 on the reeling frame 11 are sequentially passed through the powdering mechanism 13, the yarn spreading mechanism 14, the heating mechanism 15 and the cooling mechanism 16 and then are wound up on the winding frame 17 to form small fiber spindles 18; the weaving mechanism 200 includes a circular weaving machine 21 and a robot arm 25, the robot arm 25 is used to drive the core shaft 25 to move in the weaving ring 22 of the circular weaving machine 21 to form a preform wrapped with the core shaft 25; the transfer mechanism 01 is arranged between the yarn rewinding mechanism 100 and the weaving mechanism 200, and is used to transfer the small fiber spindles 18 to the yarn carrier 23 of the circular weaving machine 21.

[0033] When in use, the unwinding rack 11 starts to operate, and the fiber spindle 12 placed on the unwinding rack 11 is released to prepare for subsequent processing; when the fiber on the spindle passes through the powdering mechanism 13, a layer of powder will be evenly applied, which helps to reduce the friction and adhesion between the fibers and improve the smoothness of subsequent processing; then, the fiber passes through the yarn spreading mechanism 14, which ensures that the fiber is straight and kinked, providing a good foundation for heating and weaving. The fiber passing through the heating mechanism 15 is heated to soften the coating or resin that may exist, and promote its morphological stability and ability to combine with other materials during the weaving process. The fiber after the heat treatment immediately passes through the cooling mechanism to quickly solidify the changes caused by the heating, lock the structure and size of the fiber, and provide the necessary stability for subsequent weaving. Finally, the processed fiber spindle 18 is wound on the winding rack 17, ready to enter the weaving stage. The fiber spindle that has completed the yarn reversing process is transferred to the weaving area by the transfer mechanism, specifically to the yarn carrier 11 of the circular knitting machine, and the mechanical arm drives the mandrel 12 to move in the weaving ring 10 to form the required preform shape and structure.

[0034] In the present application, the fibers are initially shaped by a yarn reversing mechanism before weaving. During the initial shaping process, powdering, heating and cooling are controlled to ensure the processing quality, dimensional stability and surface smoothness of the fiber material. The width of the initially shaped fiber yarn is stable and fiber accumulation is not easy to occur. After being woven onto a core mold to form a preform, the fibers are in sheet form, maintaining a good and stable fiber width, reducing surface gaps in the preform, and facilitating the consistency of the fiber volume content after molding.

[0035] In a further embodiment, Figure 2As shown, the powdering mechanism 13 includes a silo, a powder distributor for spreading powder on the fiber, and two pressing rollers at the same level; the outer circumferential surfaces of the two pressing rollers are tangent, and the tangent setting makes the circular edges of the two pressing rollers lightly touch or just touch each other without overlapping. The tangent pressing rollers can convert the bonded powder particles in the powdering mechanism 13 into powdered materials, and can ensure that the powder is evenly transferred to the powder distributor to avoid excessive or uneven discharge. The powder distributor can accurately and evenly distribute the powdered material to the fiber.

[0036] In a further embodiment, Figure 2 As shown, the yarn spreading mechanism 14 includes two tangential yarn spreading wheels, and the fiber passes through the two tangential yarn spreading wheels. Two smooth, tangential circular yarn spreading wheels form a continuous but non-overlapping contact point. This design ensures that the fiber can pass smoothly between the two wheels, avoiding fiber entanglement caused by too large a gap or fiber extrusion damage caused by too small a gap. The fiber passes between the two tangential yarn spreading wheels from one end. During the passing process, the rotation of the yarn spreading wheel allows the fiber to be evenly stretched and spread, removes wrinkles in the fiber, and improves the straightness and parallelism of the fiber.

[0037] Furthermore, if Figure 2 As shown, the yarn spreading mechanism can also be equipped with a tension control system, which can finely control the tension of the fiber by adjusting the rotation speed and pressure of the yarn spreading wheel or using an additional tension adjustment device to ensure that the physical properties of the fiber are not damaged during the processing and meet the specific requirements of the subsequent processing for the fiber tension.

[0038] In a further embodiment, Figure 2 As shown, the heating mechanism 15 is a heating lamp. The present application uses a light source as a heating source, which can achieve rapid heating of the fiber and precise temperature control. For example, infrared heating lamps and LED heating lamps are specifically used.

[0039] In a further embodiment, Figure 2 As shown, the cooling mechanism 16 includes two tangent metal rollers, and the fibers pass through the two tangent metal rollers. The two tangent metal rollers ensure that the fibers can fully contact the metal surface when passing through, thereby achieving uniform heat dissipation. Metal materials have good thermal conductivity and can quickly absorb heat from the fibers and conduct it away, avoiding changes in fiber properties caused by local overheating or uneven cooling. The tangent metal roller design reduces the bending path of the fibers when passing through, reducing the risk of fiber damage or deformation caused by excessive bending, and is particularly suitable for fragile or highly elastic fiber materials.

[0040] like Figure 3 and Figure 4 As shown, the braiding mechanism 200 adopts a conventional circular braiding machine, which will not be further described in this application.

[0041] In a further embodiment of the present application, Figure 1 As shown, the weaving device also includes a shaping component 300 arranged on one side of the weaving mechanism 200; the shaping component 300 includes a vacuum bag and an oven, the vacuum bag is detachably connected to the preform wrapped with the core shaft 12, and the oven is used to heat the preform with the vacuum bag.

[0042] The shaping component 300 of the present application includes a vacuum bag and an oven. When in use, the vacuum bag is tightly wrapped around the preform to ensure that the internal pressure of the preform is uniform, and then the preform is placed in an oven for heating. Heating promotes the curing of the resin or further stabilizes the fiber structure, completing the shaping of the product. The preform fibers are bonded together by heat setting, and the carbon fibers between the layers are also bonded together. After the shaping agent in the preform is cooled and formed into a film, the original shape of the preform can be maintained, ensuring that the subsequent core removal operation is not prone to fiber loosening and slippage.

[0043] Furthermore, a transfer mechanism 02 is provided between the braiding mechanism 200 and the shaping assembly 300, and the transfer mechanism 02 is used to transfer the preform wrapped with the mandrel 12 to the shaping assembly. The transfer mechanism 02 and the transfer mechanism 01 are both multi-axis robotic arms, and the setting of the multi-axis robotic arms improves the automation of the device.

[0044] In one embodiment of the present application, a preform weaving method is also disclosed. The method is implemented by using a weaving device in any of the above embodiments. Figure 5 As shown, the method comprises the following steps:

[0045] Step 1, carbon fiber yarn rewinding. A single fiber large spindle 12 is installed on the unwinding frame 11 of the yarn rewinding machine. After the single carbon fiber is initially shaped by the setting agent powdering mechanism 13, the yarn spreading mechanism 14, the heating mechanism 15, and the cooling mechanism 16, it is finally unwound and wound onto the small fiber spindle 18. This step sets the carbon fiber initially by setting the powdering amount at 3-10g / m2, the heating temperature at 100℃-110℃, and the unwinding speed at 2m / s-3m / s. At this time, the carbon fiber presents a sheet-like shape with a stable width and is not easy to deform, and maintains good flexibility. In the next weaving process, there are fewer fiber filaments and it is not easy to pile up together.

[0046] Step 2, carbon fiber weaving. Install the fiber spindle 18 that has completed the reverse yarn in step 1 onto the yarn carrier 23 of the circular braiding machine 21. The fibers on the spindle pass through the track on the yarn carrier 23 and then pass through the braiding ring 22 together. Use a cable tie to tie all the carbon fibers together. The robot arm 25 clamps the mandrel 24 and moves it to the front of the braiding ring 22. When the machine is turned on, the spindle moves on the track of the circular braiding machine 21 to interweave the yarns. The robot arm 25 clamps the mandrel 24 to support the interwoven carbon fibers and passes them forward horizontally through the braiding ring 22. At this time, the interwoven carbon fibers wrap the mandrel 24 to complete the single-layer braiding. The mandrel 24 moves horizontally backward in the braiding ring 22 to complete the second layer of braiding. The mandrel 24 repeats the reciprocating motion in the braiding ring to complete the multi-layer braiding to the required thickness. After shutting down, remove the preform from the seven-axis robot arm.

[0047] Step 3: Shape the carbon fiber woven preform. Wrap the surface of the woven preform with a vacuum bag and evacuate to a pressure of ≥850mbar, heat it in an oven to 120°C, and keep it for 30 minutes to complete heat setting. After the preform is cooled, remove the vacuum bag and detach it from the core mold. The preform can maintain its original shape, making it easy to load it into the molding mold for subsequent RTM and other processes.

[0048] In step 1, the carbon fiber is initially shaped by the powdering mechanism 13 and the heating mechanism 15. The width of the initially shaped carbon fiber yarn is stable and fiber accumulation is not easy to occur. After being woven onto the core mold to form a preform, the carbon fiber is in sheet form, maintaining a good and stable fiber width and reducing surface gaps of the preform.

[0049] In step 3, the entire preform is vacuum-heated, and the shaping agent used to initially shape the carbon fibers melts to bond the interwoven carbon fibers together, while also bonding the carbon fibers between the layers together. After the shaping agent in the preform cools and forms a film, the original shape of the preform can be maintained, and fibers are not likely to loosen or slip after leaving the core mold.

[0050] In summary, this application has the following advantages:

[0051] The carbon fiber is initially shaped before yarn rewinding. The width of the initially shaped carbon fiber yarn is stable and fiber accumulation is not easy to occur. After being woven onto the core mold to form a preform, the carbon fiber appears in a sheet shape, maintaining a good and stable fiber width and reducing the surface gaps of the preform.

[0052] Before removing the core mold, the preform fibers are bonded together through heat setting, and the carbon fibers between layers are also bonded together. After the setting agent in the preform is cooled and formed into a film, the original shape of the preform can be maintained, and the fibers are not likely to fall apart and slip after leaving the core mold.

[0053] The application steps are simple and the operation is convenient. On the basis of not increasing too much production cost, the weaving technology is applicable to the production of more products.

[0054] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A fiber preform weaving device, characterized in that: include: The yarn rewinding mechanism (100) comprises an unwinding frame (11), a powdering mechanism (13), a yarn spreading mechanism (14), a heating mechanism (15), a cooling mechanism (16) and a winding frame (17) which are arranged in sequence, wherein the large fiber spindle (12) on the unwinding frame (11) passes through the powdering mechanism (13), the yarn spreading mechanism (14), the heating mechanism (15) and the cooling mechanism (16) in sequence and is then wound on the winding frame (17) to form a small fiber spindle (18); A braiding mechanism (200) comprising a circular braiding machine (21) and a mechanical arm (25), wherein the mechanical arm (25) is used to drive a core shaft (24) to move in a braiding ring (22) of the circular braiding machine (21) to form a preform wrapped with the core shaft (24); A transfer mechanism (01) is arranged between the yarn rewinding mechanism (100) and the weaving mechanism (200) and is used to transfer the fiber spindles (18) to the yarn carrier (23) of the circular knitting machine (21).

2. The fiber preform weaving device according to claim 1, characterized in that: The powder spreading mechanism (13) comprises a silo, a powder distributor for spreading powder onto the fibers, and two pressing rollers located at the same level; The outer circumferential surfaces of the two pressing rollers are tangent to each other, the material bin is located above the pressing rollers, and the powder distributor is located below the pressing rollers.

3. The fiber preform weaving device according to claim 1, characterized in that: The yarn spreading mechanism (14) comprises two tangent yarn spreading wheels, and the fibers pass through the two tangent yarn spreading wheels.

4. The fiber preform weaving device according to claim 1, characterized in that: The heating mechanism (15) is a heating lamp.

5. The fiber preform weaving device according to claim 1, characterized in that: The cooling mechanism (16) comprises two tangential metal rollers, and the fibers pass through the two tangential metal rollers.

6. The fiber preform weaving device according to claim 1, characterized in that: It also includes a shaping component (300) arranged on one side of the weaving mechanism (200); The shaping component (300) comprises a vacuum bag and an oven, wherein the vacuum bag is detachably connected to a preform wrapped with a core shaft (24), and the oven is used to heat the preform with the vacuum bag.

7. The fiber preform weaving device according to claim 6, characterized in that: A transfer mechanism (02) is also provided between the braiding mechanism (200) and the shaping component (300), and the transfer mechanism (02) is used to transfer the preform wrapped with the core shaft (24) to the shaping component.

8. The fiber preform weaving device according to claim 7, characterized in that: The transfer mechanism and the transport mechanism are both multi-axis robotic arms.

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