A carrier for a composite three-dimensional braiding machine

Abstract

The application discloses a yarn carrier of a composite material three-dimensional braiding machine, which comprises a ratchet wheel, a coil spring, a coil spring box and a ratchet wheel shaft, the ratchet wheel shaft is positioned in the center of the coil spring box, the coil spring box rotates relative to the ratchet wheel shaft, the ratchet wheel is located in the coil spring box and is fixedly sleeved on the ratchet wheel shaft, the coil spring is located in the coil spring box, one end of the coil spring is fixed in the coil spring box, and the other end of the coil spring is provided with an angle limit on the tooth back of the ratchet wheel, the outer side of the coil spring box is used for winding yarn, the coil spring box rotates when being pulled by the yarn, and the rotation of the coil spring box drives the angle of the coil spring to jump the tooth. Through the accurate cooperation of the coil spring and the ratchet wheel, dynamic adjustment of the yarn tension can be realized, the tension stability in the braiding process is ensured, the braiding quality problems caused by the tension fluctuation are reduced, and the probability of the yarn carrier component failure caused by the tension fluctuation in the braiding process is reduced.

Description

Technical Field

[0001] This invention relates to the field of three-dimensional weaving of composite materials, specifically to a yarn carrier for a three-dimensional weaving machine for composite materials. Background Technology

[0002] Unlike traditional manual 3D weaving where the yarn is generally under low tension, digital 3D weaving equipment requires the yarn to maintain constant tension throughout the weaving process. This ensures the yarn remains stable and prevents tangling. In digital 3D weaving, yarn tension is primarily controlled by the yarn carrier. However, yarn tension fluctuates at different stages of the weaving process, influenced by other processing units, affecting its position, angle, and length. Therefore, to ensure the uniformity of the prefabricated structure and reduce the probability of yarn carrier component failure, precise control of tension fluctuations is crucial. Currently available yarn carriers cannot meet these requirements. Summary of the Invention

[0003] Purpose of the invention: To address the above-mentioned shortcomings, this invention provides a yarn carrier for a three-dimensional composite material weaving machine with adjustable tension fluctuations, increased yarn throwing, controllable yarn output, and a miniaturized yarn carrier.

[0004] Technical Solution: To solve the above problems, the present invention employs a yarn carrier for a composite material three-dimensional braiding machine, comprising a ratchet, a coil spring, a coil spring box, and a ratchet shaft. The ratchet shaft is positioned at the center of the coil spring box, and the coil spring box rotates relative to the ratchet shaft. The ratchet is located inside the coil spring box and is fixedly sleeved on the ratchet shaft. The coil spring is located inside the coil spring box, with one end fixed inside the coil spring box and the other end having a bend angle limited to the back of the ratchet teeth. The outer side of the coil spring box is used for winding the yarn, and the coil spring box rotates as the yarn is pulled. The rotation of the coil spring box drives the bend angle teeth of the coil spring to skip.

[0005] Furthermore, it also includes a yarn guide frame fitted outside the spring box. The yarn guide frame is fixedly connected to the ratchet shaft and is used to guide the yarn. The yarn guide frame has a rounded corner yarn guide surface. The yarn slides tangentially to the yarn guide surface, effectively reducing yarn wear and fiber folding loss during weaving, improving fiber lifespan, and maintaining yarn tension stability.

[0006] Furthermore, the coil spring is a contact-type planar spiral spring with a multi-turn structure. When the yarn pulls the coil spring box to rotate counterclockwise, the coil spring box applies a tensile force to the coil spring. When the tensile force exceeds a threshold, the coil spring skips teeth on the ratchet.

[0007] The yarn throwing distance is a crucial functional parameter for the yarn carrier during weaving; it refers to the adjustable length of the yarn on the carrier. The yarn pulls the spring box to rotate counter-clockwise. The spring box, connected to the spring, applies tension to the spiral spring. The distance the yarn is stretched between the start of stretching and the skipping tooth is the yarn throwing distance. When the yarn tension fluctuation reaches a certain threshold, the bend angle moves between the ratchet teeth, causing a single-tooth skip on the ratchet. Each skip causes the spring to retract an adjustable length of yarn. Tension fluctuations are fed back to the outside of the spring box through the yarn guide to ensure stable tension control and uniform yarn release.

[0008] Furthermore, a yarn fixing groove is provided circumferentially on the outer side of the spring box, and the yarn is wound in the yarn fixing groove to prevent the yarn from slipping off.

[0009] The present invention also employs a three-dimensional weaving machine with a yarn carrier using the above-mentioned composite material three-dimensional weaving machine, wherein the yarn guide frame and the yarn carrier base are connected by fasteners to adapt to different models of bases.

[0010] Beneficial effects: Compared with the prior art, the significant advantages of this invention are:

[0011] 1. Improve yarn tension control: Through the precise cooperation of the coil spring and ratchet, the yarn tension can be dynamically adjusted, ensuring tension stability during the weaving process, reducing weaving quality problems caused by tension fluctuations, and reducing the probability of yarn carrier component failures caused by tension fluctuations during the weaving process.

[0012] 2. Improve weaving efficiency and precision: The ratchet combined with the spiral spring design enables precise control of yarn take-up and take-up. A fixed length of yarn is retrieved in a single skip, which is suitable for different process requirements, reduces manual intervention, and improves weaving efficiency and precision.

[0013] 3. Reduce yarn wear: By setting a yarn guide structure with rounded corners, the yarn slides tangentially during the yarn exit process, which effectively reduces the friction between the yarn and the guide surface and avoids fiber wear caused by sharp angles or high contact stress in traditional ceramic eye yarn exit.

[0014] 4. Extend yarn lifespan: By controlling the slippage of the yarn on the guide surface and the stable control of tension, the breakage or loss caused by yarn bending and excessive tension in traditional yarn carriers is effectively avoided, thereby extending the yarn lifespan.

[0015] 5. High Adaptability: The newly added yarn delivery and fixing structure can be directly adapted and installed with existing bases without significant modifications to existing equipment, exhibiting high versatility and facilitating its application in various composite material weaving equipment. This yarn carrier has a compact structure, strong fatigue resistance and reliability, and can operate stably for extended periods in the complex working environment of three-dimensional rotary weaving, ensuring the continuity and controllability of yarn release and tightening. It achieves adjustable tension fluctuations, increased yarn throwing, controllable yarn delivery, and a miniaturized and simplified yarn carrier design. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the yarn carrier of the present invention.

[0017] Figure 2 This is a cross-sectional schematic diagram of the yarn carrier of the present invention.

[0018] Figure 3 This is a schematic diagram of the yarn feeding direction from the main view of the yarn carrier of the present invention.

[0019] Figure 4 This is a side view of the yarn feeding direction of the yarn carrier of the present invention. Detailed Implementation

[0020] like Figures 1 to 4 As shown, the yarn carrier of a composite material three-dimensional braiding machine in this embodiment includes a spring box 2, a ratchet 3, a ratchet shaft 4, a spring 5, and a yarn guide frame 6. The ratchet shaft 4 is located in the center of the yarn carrier and is used to fix the ratchet 3. The spring 5 is a contact-type planar spiral spring located between the ratchet 3 and the spring box 2, and is used to provide the rebound force for the winding and unwinding of the yarn 1. One end of the spring 5 is fixedly connected to the spring box 2, and the other end is provided with a bend. The bend is limited to the back of the teeth of the ratchet 3 and engages with it to maintain the initial state of the spring 5. The spring 5 achieves unidirectional rotation through the bend. The spring box 2 is used to wind the yarn 1 and rotates as the yarn 1 is pulled. The yarn guide frame 6 is located outside the yarn 1 and includes a fixing component that adapts to the base and a yarn guide surface with rounded corners, such as... Figure 4 As shown, yarn 1 slides tangentially through the guide surface, effectively reducing yarn 1 wear and fiber folding loss during weaving.

[0021] The pitch of the ratchet 3 is adjusted according to the tension requirements; the coil spring 5 is a contact-type planar spiral spring with a multi-turn structure; the coil spring box 2 is a ring-shaped component with a yarn 1 fixing groove on its surface to prevent the yarn 1 from slipping off; the yarn guide frame 6 is connected to the yarn carrier base by fasteners to adapt to different models of bases.

[0022] The ratchet 3 is connected to the coil spring 5 through a bend structure. The bend is fixed at the end of the coil spring 5. The unidirectional skipping of the coil spring 5 is achieved by the movement of the bend between the teeth of the ratchet 3. The outer end of the coil spring 5 is fixedly connected to the coil spring box 2 through a fastener, and the inner end is engaged with the ratchet 3 through the bend structure. The skipping action of the coil spring 5 is driven by the rotation of the coil spring box 2. The rotation of the coil spring box 2 is achieved by the pulling of the yarn 1.

[0023] The working process of the yarn carrier described in this embodiment can be described in units as follows:

[0024] Working process of the fixing mechanism: The center of the coil spring 5 is limited by the ratchet 3 to maintain the initial state of the coil spring 5 and ensure that the coil spring 5 provides a stable rebound force during the winding and unwinding of the yarn 1.

[0025] Working process of ratchet 3: ratchet 3 is connected to coil spring 5 through a bend structure. The movement of the bend between the teeth of ratchet 3 realizes the one-way skipping of coil spring 5, ensuring that yarn 1 maintains one-way movement during winding and unwinding, and preventing yarn 1 from rolling back.

[0026] Working process of coil spring 5: Coil spring 5 applies tensile force to the spiral spring through the rotation of coil spring box 2. Coil spring 5 stores energy during the stretching process and adjusts the tension of yarn 1 through rebound force when the tension of yarn 1 fluctuates, so as to ensure the stability of the tension of yarn 1.

[0027] Working process of spring box 2: Spring box 2 rotates by pulling yarn 1. The rotation of spring box 2 drives the spring 5 to jump teeth, thereby realizing the dynamic adjustment of the tension of yarn 1.

[0028] Working process of yarn guide frame 6: The yarn guide frame guides the dynamic entry and exit of the yarn through the yarn guide component, controls the yarn tension, and reduces the contact wear between the yarn and the guide surface through the rounded corner design, ensuring the smooth sliding of the yarn.

[0029] Spring torque calculation: The spring is a key component of the yarn carrier, and its torque characteristics directly affect the rotation angle of the outer ring and the amount of yarn thrown. Let the spring stiffness coefficient be k, the spring box radius be r0, and the effective radius of the inner ring be r. i If the outer ring rotates by an angle φ, then the relationship between the rotation angle θ of the coil spring and the torque M is:

[0030] M=k·θ

[0031]

[0032] Calculation of outer ring rotation and yarn release amount: The relationship between the outer ring rotation angle φ and the yarn release length L is as follows:

[0033] L=φ·r o

[0034] When the yarn is subjected to tension fluctuations, the tension change ΔT will cause a change in the rotation angle of the coil spring Δθ, which in turn will cause a change in the outer ring angle Δφ. The corresponding change in the amount of yarn thrown ΔL is:

[0035]

[0036] Ratchet tooth skipping and yarn take-back calculation: The ratchet structure is the core component of the yarn carrier, used to control the amount of yarn taken back. Let the ratchet tooth pitch be p, and the take-back length L corresponding to the spring when the ratchet skips one tooth. r for:

[0037] L r =p·r o

[0038] Calculation of yarn release: The net change in yarn amount is calculated by the yarn release ΔL caused by the tightening of the coil spring and the yarn recovery L caused by the ratchet skipping teeth. r Decide:

[0039] L 放纱 =ΔL-L r

[0040] To meet the actual requirements of a constant tension greater than 2N for the yarn carrier and a tension deviation of less than 5% for each control unit, when the knitting angle is preset to 45°, this L 放纱 Given (6mm, 8mm), calculate the ratchet parameters, and the result is the ratchet diameter D. 棘轮 =52mm, number of ratchet teeth N 齿 =52 and gear module m=1.

[0041] Meanwhile, according to the formula for calculating the stiffness of a coil spring:

[0042]

[0043] G is the shear modulus of the material (unit: N / m). 2 The value usually depends on the material of the coil spring (such as steel, alloy, etc.), with a preset G = 8 × 10. 10 N / m 2 ; d is the wire diameter of the coil spring; N 圈 R is the number of coils in the coil spring. 涡旋 (where the average radius is the coil spring).

[0044] The width 'b' of a coil spring is primarily determined by its application and mechanical requirements, and its size is usually closely related to the load it bears. Generally, the coil spring width can be estimated using the following formula:

[0045]

[0046] d is the wire diameter of the coil spring; N 圈This represents the number of coil turns in the coil spring. The coil spring parameters are calculated, including the spring stiffness: k. 涡旋 ≈231.48N; Spring width: b=25mm; Number of spring coils: N 圈 = 10 laps.

[0047] These parameters will ensure that the coil spring can provide appropriate elasticity and control during yarn pulling, thereby enabling precise yarn release and retrieval and meeting design requirements.

[0048] The yarn carrier of the present invention, based on having the functions of taking in and releasing yarn, achieves real-time stability of yarn take-in tension by automatically triggering the machine through changes in external yarn tension; the ratchet assembly, as a pure mechanical structure with unidirectional damping characteristics, has the characteristics of simple structure and stable performance, making the overall structure of the yarn carrier highly efficient and simple.

Claims

1. A yarn carrier for a three-dimensional composite material braiding machine, characterized in that, Includes a ratchet (3), a coil spring (5), a coil spring box (2), and a ratchet shaft (4). The ratchet shaft (4) is positioned at the center of the coil spring box (2), and the coil spring box (2) rotates relative to the ratchet shaft (4). The ratchet (3) is located inside the coil spring box and is fixedly sleeved on the ratchet shaft (4). The coil spring (5) is located inside the coil spring box (2). One end of the coil spring (5) is fixed inside the coil spring box (2), and the other end is provided with a bend angle limited to the back of the teeth of the ratchet (3). The outer side of the coil spring box (2) is used to wind yarn, and the coil spring box (2) rotates as the yarn is pulled. The rotation of the coil spring box (2) drives the bend angle of the coil spring (5) to skip teeth. Determine the ratchet tooth pitch p based on the tension and yarn feed requirements of the yarn feeder: in, r is the yarn recovery length corresponding to the spring skipping one tooth on the ratchet. o The outer diameter of the spring box. For yarn feed rate, This represents the change in the amount of yarn polishing. The change in tension. The effective radius of the inner ring of the coil spring. This is the spring stiffness coefficient.

2. The yarn carrier of the composite material three-dimensional braiding machine according to claim 1, characterized in that, It also includes a yarn guide frame (6) sleeved outside the spring box (2), the yarn guide frame (6) being fixedly connected to the ratchet shaft (4), and the yarn guide frame (6) being used to guide the yarn.

3. The yarn carrier of the composite material three-dimensional braiding machine according to claim 2, characterized in that, The yarn guide frame (6) is provided with a rounded corner yarn guide surface, and the yarn slides by being tangent to the yarn guide surface.

4. The yarn carrier of the composite material three-dimensional braiding machine according to claim 1, characterized in that, The coil spring is a contact-type planar spiral spring with a multi-turn structure.

5. The yarn carrier of the composite material three-dimensional braiding machine according to claim 4, characterized in that, When the yarn pulls the coil spring box to rotate counterclockwise, the coil spring box applies a tensile force to the coil spring. When the tensile force exceeds the threshold, the coil spring skips teeth on the ratchet.

6. The yarn carrier of the composite material three-dimensional braiding machine according to claim 1, characterized in that, The outer side of the spring box (2) is provided with a yarn fixing groove, and the yarn is wound in the yarn fixing groove.

7. The yarn carrier of the composite material three-dimensional braiding machine according to claim 1, characterized in that, The formula for calculating the stiffness coefficient of the coil spring is as follows: in, The shear modulus of the material. The wire diameter of the coil spring. This represents the number of coils in the coil spring. is the average radius of the coil spring.

8. The yarn carrier of the composite material three-dimensional braiding machine according to claim 7, characterized in that, The width of the coil spring is: in, This represents the width of the coil spring.

9. A three-dimensional knitting machine, characterized in that, The yarn carrier of the composite material three-dimensional braiding machine according to any one of claims 1-8 is adopted.

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