A hook stitching device and system for forming a composite preform

Abstract

The application discloses a hook-sewing device and system for forming a composite material preform, wherein the hook-sewing device comprises a base, a rotating ring, a push rod, a bearing unit, a hook-sewing needle and a reset member; the base is provided with a supporting shaft; the rotating ring is rotatably installed on the supporting shaft; the push rod is slidably installed in the rotating ring and can move along the axial direction of the supporting shaft; the bearing unit is rotatably installed on the supporting shaft; the hook-sewing needle is placed on the bearing unit; the reset member is connected with the push rod; in the initial state, there is a certain distance between the push rod and the hook-sewing needle; under the action of external force, the push rod slides away from the rotating ring and is inserted with the hook-sewing needle, and the sewing is realized by cooperating with the rotation of the rotating ring; when the external force is removed, the push rod is reset to the initial state under the action of the reset member. The interlayer fracture toughness and fatigue strength of the preform product are improved through the sewing technology, and the manufacturing of the large structure preform product is realized by combining the sewing technology with the weaving technology, so that the preform product has good connection strength.

Description

Technical Field

[0001] This application belongs to the field of composite material preform manufacturing technology, specifically relating to a hooking device and system for forming composite material preforms. Background Technology

[0002] Three-dimensional textile composites are advanced structural composite materials with excellent mechanical properties. They can be used to manufacture the main load-bearing components of various structures and are currently widely used in important fields such as aviation, aerospace, automotive, and shipbuilding. The manufacturing process of three-dimensional composite preforms mainly employs bonding and weaving techniques.

[0003] However, bonding technology cannot guarantee the various mechanical properties of precast products under certain specific conditions; as for weaving technology, small precast products are mostly operated manually, which results in high processing costs and low production efficiency. For some large precast structural products with three-dimensional spatial shapes, the complexity of the process and the lack of flexibility of three-dimensional weaving machines make it difficult to achieve the desired results using only weaving methods. Summary of the Invention

[0004] To address the technical problems that existing bonding technologies cannot guarantee the mechanical properties of precast products under certain conditions, and that weaving technologies currently rely heavily on manual operation for small precast products, resulting in high processing costs and low production efficiency, thus failing to enable the manufacturing of large-scale precast structures, this application provides a hook-and-seam device for molding composite material precast bodies.

[0005] A first aspect of this application provides a hook-locking device for forming composite material preforms, comprising:

[0006] A base, on which a support shaft is provided;

[0007] A rotating ring is rotatably mounted on the support shaft;

[0008] The push rod is slidably mounted in the rotating ring and is capable of moving axially along the support shaft;

[0009] The support unit is rotatably mounted on the support shaft and is used to support the hook sewing needle;

[0010] A hook sewing needle is placed on the support unit;

[0011] A reset component is connected to the push rod;

[0012] Initially, there is a certain distance between the push rod and the hook needle;

[0013] Under the action of external force, the push rod slides away from the rotating ring and engages with the hook needle;

[0014] When the external force is released, the push rod is reset to its initial state under the action of the reset component.

[0015] In some alternative embodiments, a motor is also included, the output shaft of which is a gear shaft, and a gear is provided on the outer ring of the rotating ring, the gear meshing with the teeth on the gear shaft.

[0016] In some optional embodiments, the rotating ring is provided with a mounting groove, the push rod and the reset member are disposed in the mounting groove, the push rod can slide along the mounting groove under the action of external force, and the push rod can be reset under the action of the reset member when the external force is released.

[0017] In some alternative embodiments, a coil is also included, which is disposed in the mounting groove, and the push rod and the reset member are disposed within the coil. When the coil is energized, it can drive the push rod to move away from the rotating ring.

[0018] In some alternative embodiments, a bearing is also included, which is mounted on the support shaft, and the rotating ring is provided with a connecting hole, in which the bearing is embedded.

[0019] In some alternative embodiments, the support unit includes a support frame and a support ring, the support frame being mounted on the support shaft, the support ring being rotatably mounted on the support frame, and the axial direction of the support ring being parallel to the axial direction of the support shaft, the support ring being used to support the hook sewing needle.

[0020] In some optional embodiments, the support frame is provided with a plurality of support rods evenly arranged along the circumferential direction, parallel to the axial direction of the support shaft, and a plurality of support rings are provided, the support rings being rotatably mounted on the support rods.

[0021] In some alternative embodiments, the outer wall of the support ring is provided with an annular groove, the cross-sectional shape of the annular groove is triangular, and the hook sewing needle is placed in the annular groove.

[0022] In some alternative embodiments, the hook needle is semi-circular in shape, with a thread hole and a needle tip at each end. The hook needle also has two insertion holes located between the thread hole and the needle tip, which are used to connect to the end of the push rod away from the rotating ring.

[0023] A second aspect of this application provides a hooking system for forming composite material preforms, including a robot and the hooking device for forming composite material preforms, wherein the robot's robotic arm is connected to the base.

[0024] A hook-joint device for forming composite material preforms according to one or more embodiments of this application has the following technical effects:

[0025] The push rod is slidably installed in the rotating ring and can move axially along the support shaft. Initially, there is a certain distance between the push rod and the hook needle. Under the action of external force, the push rod slides away from the rotating ring and engages with the hook needle, cooperating with the rotation of the rotating ring to achieve sewing. When the external force is released, the push rod returns to its initial state under the action of the reset component, preparing for the next sewing. The sewing technology improves the interlaminar fracture toughness and fatigue strength of precast products. Combining sewing and weaving technologies enables the manufacture of large-scale precast structural products, giving them better connection strength. It can also replace adhesive and riveting technologies and is applicable to the manufacturing process of composite material precast bodies in certain special fields. Attached Figure Description

[0026] Figure 1 A cross-sectional view of a hook-joint device for forming composite material preforms according to one or more embodiments of this application is shown;

[0027] Figure 2 This application shows Figure 1 Enlarged view of part A in the middle;

[0028] Figure 3 This application shows Figure 1 Enlarged view of part B in the middle;

[0029] Figure 4 A schematic diagram of the rotating ring of the hook-joint device for forming composite material preforms according to one or more embodiments of this application is shown;

[0030] Figure 5 A schematic diagram of the hook needle of the hook-sewing device for forming composite material preforms according to one or more embodiments of this application is shown;

[0031] Figure 6 A schematic diagram of the hook needle of the hook sewing device for forming composite material preforms according to one or more embodiments of this application is shown in the initial position.

[0032] Figure 7 A schematic diagram of a hook-sewing device for forming composite material preforms according to one or more embodiments of this application is shown, showing the hook-sewing needle rotating 120°.

[0033] Figure 8 This invention illustrates a schematic diagram showing the structure of a hook-sewing device for forming composite material preforms according to one or more embodiments of the present application, in which the hook needle returns to its initial position.

[0034] Figure 9A top view of a hook-joint system for forming composite preforms according to one or more embodiments of this application is shown;

[0035] Figure 10 A front view of a hook-locking system for forming composite preforms according to one or more embodiments of this application is shown.

[0036] Explanation of reference numerals in the attached drawings: 100-first braid, 200-second braid, 300-membrane, 1-base, 11-support shaft; 2-rotating ring, 21-mounting groove, 22-connecting hole; 3-push rod; 4-bearing unit, 41-support frame, 411-support rod, 42-support ring, 421-annular groove; 5-hooking needle, 51-threading hole, 52-needle tip, 53-insertion hole; 6-reset component; 7-motor; 8-coil; 9-bearing. Detailed Implementation

[0037] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0038] Before introducing the embodiments, the solution of combining weaving technology and sewing technology in this application will be explained: In the preparation process of three-dimensional composite material preform products, the woven body needs to be cut into blocks and laid on the mold. The woven body blocks need to be sewn together with hook needles to connect them into a whole, forming a complete three-dimensional woven body structure that fits on the mold, in preparation for subsequent processing.

[0039] Reference Figures 1-8 As shown, a first aspect of this application provides a hook-sewing device for forming composite material preforms, comprising a base 1, a rotating ring 2, a push rod 3, a bearing unit 4, a hook-sewing needle 5, and a reset member 6, wherein:

[0040] A support shaft 11 is provided on the base 1;

[0041] Rotating ring 2 is rotatably mounted on the support shaft 11;

[0042] The push rod 3 is slidably installed in the rotating ring 2 and can move along the axial direction of the support shaft 11;

[0043] The supporting unit 4 is rotatably mounted on the support shaft 11 and is used to support the hook needle 5;

[0044] The hook needle 5 is placed on the support unit 4;

[0045] The reset component 6 is connected to the push rod 3; the reset component 6 may be a spring.

[0046] In the initial state, there is a certain distance between push rod 3 and hook needle 5;

[0047] Under the action of external force, the push rod 3 slides away from the rotating ring 2 and is inserted into the hook needle 5;

[0048] When the external force is released, the push rod 3 is reset to its initial state under the action of the reset member 6.

[0049] The hook-sewing device for forming composite preforms proposed in this embodiment is slidably installed in the rotating ring 2 via a push rod 3, and can move axially along the support shaft 11. Initially, there is a certain distance between the push rod 3 and the hook needle 5. Under external force, the push rod 3 slides away from the rotating ring 2 and engages with the hook needle 5, achieving sewing in conjunction with the rotation of the rotating ring 2. When the external force is released, the push rod 3 returns to its initial state under the action of the reset member 6, preparing for the next sewing. By using sewing technology to improve the interlaminar fracture toughness and fatigue strength of preform products, and combining sewing technology with weaving technology, large-scale structural preform products can be manufactured, giving them better connection strength. This technology can also replace adhesive and riveting techniques and can be applied in the manufacturing process of composite preforms in certain special fields.

[0050] In some optional embodiments, the stitching device for forming the composite preform further includes a motor 7, the output shaft of which is a gear shaft, and the outer ring of the rotating ring 2 is provided with a gear that meshes with the teeth on the gear shaft. The motor 7 is mounted on the base 1, and its output shaft is made in the form of a gear shaft and meshes with the gear on the outer ring of the rotating ring 2, driving the rotating ring 2 to rotate and be precisely positioned.

[0051] Of course, in some other embodiments, the output shaft of the motor 7 is a common shaft, and other mechanisms such as chain drive mechanism and belt drive mechanism can be used to drive the rotating ring 2 to rotate.

[0052] In some optional embodiments, the rotating ring 2 is provided with a mounting groove 21, and the push rod 3 and the reset member 6 are disposed in the mounting groove 21. The push rod 3 can slide along the mounting groove 21 under the action of external force, and the push rod 3 can be reset under the action of the reset member 6 when the external force is released. The length direction of the mounting groove 21 is parallel to the direction of the support shaft 11, so that the sliding direction of the push rod 3 is parallel to the support shaft 11, which facilitates the insertion of the push rod 3 with the hook needle 5 when sliding under the action of external force, so as to drive the hook needle 5 to rotate, realize the sewing operation, and improve the stability of the device.

[0053] In some optional embodiments, the hook-sewing device for forming the composite preform further includes a coil 8 disposed in the mounting groove 21. The push rod 3 and the reset member 6 are disposed within the coil 8. When the coil 8 is energized, it can drive the push rod 3 to move away from the rotating ring 2. When the coil 8 is energized, it generates a magnetic field, and the push rod 3 moves away from the rotating ring 2 under the action of the magnetic field force and inserts into the hook-sewing needle 5. After the power is turned off, the magnetic field force disappears, and the push rod 3 returns to its initial state under the action of the reset member 6, disengaging from the hook-sewing needle 5.

[0054] In some optional embodiments, the hook-jointing device for forming the composite preform further includes a bearing 9, which is mounted on the support shaft 11. The rotating ring 2 is provided with a connecting hole 22, and the bearing 9 is embedded in the connecting hole 22. By mounting the bearing 9 on the support shaft 11 and embedding it in the connecting hole 22 of the rotating ring 2, the rotating ring 2 can rotate relative to the support shaft 11. The bearing 9 reduces the rotational friction of the rotating ring 2, making its rotation smoother and improving the stability and reliability of the device.

[0055] In some optional embodiments, the supporting unit 4 includes a support frame 41 and a support ring 42. The support frame 41 is mounted on the support shaft 11, and the support ring 42 is rotatably mounted on the support frame 41, with the axial direction of the support ring 42 parallel to the axial direction of the support shaft 11. The support ring 42 is used to support the hook needle 5. By mounting the support frame 41 on the support shaft 11 and rotatably mounting the support ring 42 on the support frame 41, with the axial direction of the support ring 42 parallel to the axial direction of the support shaft 11, the hook needle 5 can be perpendicular to the push rod 3. This facilitates the insertion of the push rod 3 with the hook needle 5 when it moves along the axial direction of the support shaft 11, improving the stability and reliability of the device.

[0056] In some optional embodiments, the support frame 41 is provided with a plurality of support rods 411 evenly arranged along the circumferential direction. The length direction of the support rods 411 is parallel to the axial direction of the support shaft 11. Multiple support rings 42 are provided, and each support ring 42 is rotatably mounted on the support rod 411. The multiple support rings 42 support the hook-stitch needle 5. The rotatable support rings 42 reduce the friction experienced by the hook-stitch needle 5 during rotation, improving the smoothness of device operation and enhancing the reliability and stability of the device.

[0057] In some optional embodiments, the outer wall of the support ring 42 is provided with an annular groove 421, the cross-sectional shape of which is triangular, and the hook needle 5 is placed in the annular groove 421. The annular groove 421 provides good support for the hook needle 5. After the push rod 3 is inserted into and connected to the hook needle 5, it can limit the hook needle 5 along the axial and radial directions of the support shaft 11. By rotating the rotating ring 2 and the push rod 3 together, the hook needle 5 is rotated, thus realizing the sewing operation.

[0058] In some optional embodiments, the hook-and-eye needle 5 is semi-circular in shape, with a thread hole 51 and a needle tip 52 at each end. The hook-and-eye needle 5 also has two insertion holes 53 located between the thread hole 51 and the needle tip 52. These insertion holes 53 are used to connect to the end of the push rod 3 furthest from the rotating ring 2. The hook-and-eye needle 5 is semi-circular in shape, with a thread hole 51 at its tail for threading and a needle tip 52 at its head for piercing the knitted fabric. An insertion hole 53 is located at a distance of 30° from both the needle tip 52 and the thread hole 51. The push rod 3 is inserted into the insertion hole 53, causing the hook-and-eye needle 5 to rotate and perform hook-and-eye stitching.

[0059] The working principle of the hook-sewing device for forming the composite preform is as follows: Initially, the push rod 3 is inserted into the insertion hole 53 of the hook-sewing needle 5 near the thread hole 51. The insertion hole 53 near the thread hole 51 stops at a 90° position. Figure 6 As shown; when the robot carrying the hook-sewing device is positioned at the needle insertion point, the motor 7 drives the rotating ring 2 to rotate clockwise, and the rotating ring 2 drives the push rod 3 to rotate synchronously, that is, it drives the hook-sewing needle 5 to rotate along the support ring 42, rotating 120° clockwise and stopping. At this time, the hook-sewing needle 5 pierces the knitted body, and the insertion hole 53 near the needle tip 52 stops at the 210° position, as shown. Figure 7 As shown; the push rod 3 retracts, the motor 7 rotates in the reverse direction, and the insertion hole 53 near the needle tip 52 stops at the 210° position. The push rod 3 is then inserted into the insertion hole 53 near the needle tip 52, and then rotates 240° forward, positioning the insertion hole 53 near the thread hole 51 back to its initial position, as shown. Figure 8 As shown; the push rod 3 retracts again, the motor 7 rotates 120° in the opposite direction, the push rod 3 is pushed out and inserted into the insertion hole 53 of the hook needle 5, reaching the initial position, ready for the next hooking action.

[0060] A second aspect of this application provides a hooking system for forming composite material preforms, including a robot and the hooking device for forming composite material preforms, wherein the robot's robotic arm is connected to the base.

[0061] The working principle of the grouting system is as follows: Figure 9 and Figure 10As shown, the first knitted body 100 and the second knitted body 200 are aligned and placed on the fetal membrane 300. The robot carries the hook-sewing device to the needle insertion point and makes the movement trajectory plane of the hook-sewing needle perpendicular to the joint surface between the first knitted body 100 and the second knitted body 200. After the hook-sewing action is completed, the robot carries the hook-sewing device to lift up and tighten the suture to make the suture tension appropriate. The robot then repositions itself to the next needle insertion point, and the spacing of the suture stitches is controlled accordingly. The above process is repeated to complete the suture connection between the first knitted body 100 and the second knitted body 200.

[0062] The hook-and-seam system for forming composite material preforms provided in this application embodiment ensures that the suture stitch spacing is uniform, the insertion depth is consistent, and the tension of the suture thread can be controlled during the sewing process, thus ensuring sewing quality and improving efficiency.

[0063] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0064] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0065] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0066] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0067] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A stitching device for forming a composite preform, the stitching device comprising: The utility model relates to a hook sewing device for composite material preform, which comprises a base, a rotating ring, a push rod, a bearing unit, a hook sewing needle and a reset member. The base is provided with a support shaft, and the rotating ring is rotatably installed on the support shaft. The push rod is slidably installed in the rotating ring and can move along the axial direction of the support shaft. The bearing unit is rotatably installed on the support shaft and is used for bearing the hook sewing needle. The hook sewing needle is placed on the bearing unit. The push rod is connected with the reset member. In the initial state, there is a certain distance between the push rod and the hook sewing needle. Under the action of external force, the push rod slides away from the rotating ring and is inserted with the hook sewing needle. When the external force is removed, the push rod is reset to the initial state under the action of the reset member. The bearing unit comprises a support frame and a support ring. The support frame is installed on the support shaft, and the support ring is rotatably installed on the support frame. The axial direction of the support ring is parallel to the axial direction of the support shaft, and the support ring is used for supporting the hook sewing needle.

2. The composite preform hook-seaming apparatus of claim 1, wherein, The shape of the hook sewing needle is semicircular.

3. The composite preform hook-seaming apparatus of claim 2, wherein, The two ends of the hook sewing needle are respectively a threading hole and a needle tip.

4. The composite preform hook-seaming apparatus of claim 3, wherein, The hook sewing needle is also provided with two insertion holes.

5. The composite preform hook-seaming apparatus of claim 4, wherein, The two insertion holes are arranged between the threading hole and the needle tip.

6. The composite preform hook-seaming apparatus of claim 1, wherein, The insertion holes are used for connecting with one end of the push rod away from the rotating ring.

7. The composite preform hook-seaming apparatus of claim 6, wherein, The utility model also comprises a motor.

8. A stitch system for forming a composite preform, characterized in that, The output shaft of the motor is a gear shaft. The outer ring of the rotating ring is provided with a gear. The gear is engaged with the gear teeth on the gear shaft. The rotating ring is provided with an installation groove. The push rod and the reset member are arranged in the installation groove. The push rod can slide along the installation groove under the action of external force. The push rod can be reset under the action of the reset member when the external force is removed. The utility model also comprises a coil. The coil is arranged in the installation groove. The push rod and the reset member are arranged in the coil. The coil can drive the push rod to move away from the rotating ring in the energized state. The utility model also comprises a bearing. The bearing is installed on the support shaft. The rotating ring is provided with a connecting hole. The bearing is embedded in the connecting hole. The support frame is uniformly provided with a plurality of support rods parallel to the axial direction of the support shaft in the circumferential direction. The support ring is provided with a plurality of support rings. The support ring is rotatably installed on the support rod. The outer wall of the support ring is provided with an annular groove. The cross-sectional shape of the annular groove is triangular. The hook sewing needle is placed in the annular groove. The utility model relates to a robot and a hook sewing device for composite material preform formed according to any one of claims 1-7. The mechanical arm of the robot is connected with the base.

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