A composite material rod and its manufacturing method

Abstract

In an embodiment of the present application, a composite material rod and a manufacturing method thereof are provided. By designing the composite material rod, it includes: a metal joint, an embedded sleeve, and a composite material layer; wherein: a nested connection part is provided at the end of the embedded sleeve, an internal thread is provided on the inner wall of the nested connection part, and a groove structure is provided on the outer wall; a screwing part is provided at the end of the metal joint, at least part of the outer wall of the screwing part is provided with an external thread, the screwing part is tightly connected to the internal thread of the nested connection part through the external thread, and at least part of the outer wall of the screwing part is exposed on the side of the nested connection part close to the metal joint; the composite material layer covers the embedded sleeve and the nested connection part, and covers the outer wall of the screwing part exposed on the side of the nested connection part close to the metal joint; compared with the prior art, the bearing capacity between the composite material and the metal joint can be increased.

Description

Technical Field

[0001] This application relates to the technical field of mechanical structures, and particularly to a composite material rod and a manufacturing method thereof. Background Art

[0002] Due to the characteristics of light weight and high strength, composite materials are mainly applied in the fields of aerospace, automotive industry, textile and machinery manufacturing. In recent years, their application in wind power equipment has also developed rapidly. The stress characteristics are mainly based on plate elements, and the connection methods are usually riveting and gluing, with relatively low requirements for connection performance. In the field of emergency bridges, structural connection is a key technology for equipment. The traditional connection methods have problems such as inconsistent deformation between adhesive bonding and mechanical connection. Shear failure is likely to occur at the connection of composite material pipes and rivets, directly affecting the bearing capacity and service safety of the equipment, and unable to meet the requirements for the connection performance of emergency bridge rods. Summary of the Invention

[0003] An embodiment of this application provides a composite material rod and a manufacturing method thereof.

[0004] In a first aspect, an embodiment of this application provides a composite material rod, including: a metal joint, an embedded sleeve, and a composite material layer; wherein:

[0005] A nested connection part is provided at the end of the embedded sleeve. The inner wall of the nested connection part is provided with internal threads, and the outer wall is provided with a groove structure;

[0006] A screwing part is provided at the end of the metal joint. At least part of the outer wall of the screwing part is provided with external threads. The screwing part is tightly connected to the internal threads of the nested connection part through the external threads, and at least part of the outer wall of the screwing part is exposed on the side of the nested connection part close to the metal joint;

[0007] The composite material layer covers the embedded sleeve and the nested connection part, and covers the outer wall of the screwing part exposed on the side of the nested connection part close to the metal joint.

[0008] In some optional embodiments, the nested connection part and the embedded sleeve are of an integral structure.

[0009] In some optional embodiments, the composite material layer is connected to the outer wall of the screwing part exposed on the side of the nested connection part close to the metal joint through an adhesive.

[0010] In some optional embodiments, the groove structure includes at least two axially distributed annular grooves. There are protrusions on both sides of the annular grooves, and the protrusions protrude relative to the outer wall of the embedded sleeve.

[0011] In some optional embodiments, the composite material layer includes a first-layer composite material pipe and a second-layer composite material pipe;

[0012] The first-layer composite material tube wraps the outer wall of the inserted tube and abuts against the protrusion at one end of the groove structure, and the end of the protrusion is coplanar with the surface of the first-layer composite material tube;

[0013] The second-layer composite material tube wraps the first composite material tube, and also wraps the nested connection part and the outer wall of the screwing part that is exposed on the side of the nested connection part close to the metal joint.

[0014] In some alternative embodiments, the thickness of the second composite material tube corresponding to the annular groove matches the annular groove.

[0015] In some alternative embodiments, the second composite material tube includes at least one layer of axial composite material and at least one layer of circumferential composite material provided corresponding to the annular groove, and the axial composite material and the circumferential composite material are arranged alternately.

[0016] In some alternative embodiments, the outer diameter of the composite material layer is more than 6 mm larger than the outer diameter of the inserted tube, and the outer diameter of the first composite material tube is more than 2 mm larger than the outer diameter of the inserted tube.

[0017] In some alternative embodiments, the material of the composite material layer includes carbon fiber composite material.

[0018] In a second aspect, an embodiment of the present application provides a manufacturing method of a composite material rod, including:

[0019] Providing an inserted tube, the end of the inserted tube is provided with a nested connection part, the inner wall of the nested connection part is provided with internal threads, and the outer wall is provided with a groove structure;

[0020] Providing a composite material layer on the surface of the inserted tube, the composite material layer wraps the inserted tube and the nested connection part, and at least partially locates on one side of the end of the nested connection part;

[0021] Providing a metal joint, the end of the metal joint is provided with a screwing part, and at least part of the outer wall of the screwing part is provided with external threads;

[0022] Fastening and connecting the external threads of the screwing part corresponding to the internal threads of the nested connection part, and at least part of the outer wall of the screwing part is exposed on the side of the nested connection part close to the metal joint and is wrapped by the composite material layer.

[0023] In the composite material rod and its manufacturing method provided by the embodiments of the present application, by designing the composite material rod, including: a metal joint, an embedded sleeve, and a composite material layer; wherein: a nested connection part is provided at the end of the embedded sleeve, an internal thread is provided on the inner wall of the nested connection part, and a groove structure is provided on the outer wall; a screwing part is provided at the end of the metal joint, at least part of the outer wall of the screwing part is provided with an external thread, the screwing part is tightly connected to the internal thread of the nested connection part through the external thread, and at least part of the outer wall of the screwing part is exposed on the side of the nested connection part close to the metal joint; the composite material layer covers the embedded sleeve and the nested connection part, and covers the outer wall of the screwing part exposed on the side of the nested connection part close to the metal joint; compared with the prior art, the bearing capacity between the composite material and the metal joint can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings generally illustrate, by way of example and not limitation, the various embodiments discussed herein.

[0025] Figure 1 is a schematic cross-sectional structure diagram of a composite material rod according to an embodiment of the present application;

[0026] Figure 2 is a schematic cross-sectional structure diagram of the nested connection part;

[0027] Figure 3 is a schematic cross-sectional structure diagram during the manufacturing process of the composite material rod according to an embodiment of the present application;

[0028] Figure 4 is another schematic cross-sectional structure diagram during the manufacturing process of the composite material rod according to an embodiment of the present application;

[0029] Figure 5 corresponding to Figure 4 is a partial structure diagram of the dashed part;

[0030] Figure 6 is a partial structure diagram of the second-layer composite material tube.

[0031] Symbol description:

[0032] 11 - metal joint; 12 - embedded sleeve; 13 - composite material layer; 14 - nested connection part; 15 - screwing part; 16 - internal thread; 17 - groove structure; 18 - annular groove; 19 - protrusion; 20 - first-layer composite material tube; 21 - second-layer composite material tube; 22 - axial composite material; 23 - circumferential composite material; 24 - external thread. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In order to be able to understand the features and technical content of the embodiments of the present application in more detail, the implementation of the embodiments of the present application will be described in detail below with reference to the drawings. The attached drawings are only for reference and explanation, and are not used to limit the embodiments of the present application.

[0034] In the description of the embodiments of the present application, it should be noted that unless otherwise stated and defined, the term "connection" should be understood in a broad sense. For example, it can be the connection inside two components, can be directly connected, or can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms can be understood according to specific circumstances.

[0035] It should be noted that the terms "first / second / third" involved in the embodiments of the present application are only used to distinguish similar objects and do not represent a specific order for the objects. It can be understood that "first / second / third" can be interchanged in a specific order or sequence when permitted. It should be understood that the objects distinguished by "first / second / third" can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0036] Figure 1 This is a schematic cross-sectional structure diagram of a composite material rod in an embodiment of the present application. The embodiments of the present application provide a composite material rod, as Figure 1 shown, including: a metal joint 11, an insert sleeve 12, and a composite material layer 13.

[0037] The end of the insert sleeve 12 is provided with a nested connection portion 14, as Figure 2 shown, the inner wall of the nested connection portion 14 is provided with an internal thread 16 and the outer wall is provided with a groove structure 17.

[0038] The end of the metal joint 11 is provided with a screwing portion 15. At least part of the outer wall of the screwing portion 15 is provided with an external thread. The screwing portion 15 is tightly connected to the internal thread of the nested connection portion 14 through the external thread, and at least part of the outer wall of the screwing portion 15 is exposed on the side of the nested connection portion close to the metal joint 11.

[0039] The composite material layer 13 covers the insert sleeve 12 and the nested connection portion 14, and covers the outer wall of the screwing portion 15 exposed on the side of the nested connection portion close to the metal joint 11.

[0040] In some alternative embodiments, the nested connection portion 14 and the insert sleeve 12 are an integral structure.

[0041] Here, the insert sleeve 12 can be, for example, a metal pipe, and the nested connection portion 14 can be obtained by processing the end of the metal pipe.

[0042] In some alternative embodiments, the composite material layer 13 is connected to the outer wall of the screwing portion 15 exposed on the side of the nested connection portion 14 close to the metal joint 11 through an adhesive. Here, the adhesive can include, for example, epoxy resin.

[0043] In some alternative embodiments, the groove structure 17 includes at least two axially distributed annular grooves 18, and there are protrusions 19 on both sides of the annular grooves 18, and the protrusions 19 protrude relative to the outer wall of the nested tube 12.

[0044] In some alternative embodiments, as Figures 3 to 5 shown, the composite material layer 13 includes a first-layer composite material tube 20 and a second-layer composite material tube 21.

[0045] As Figure 3 shown, the first-layer composite material tube 20 covers the outer wall of the nested tube 12 and abuts against the protrusion 19 at one end of the groove structure 17, and the end of the protrusion 19 is coplanar with the surface of the first-layer composite material tube 20.

[0046] By providing the first composite material tube 20, the height difference between the end of the protrusion 19 and the outer wall of the nested tube 12 can be filled, so that the surface of the subsequent composite material is flat, so as to improve the axial bearing capacity of the subsequent composite material.

[0047] As Figure 4 and Figure 5 shown, the second-layer composite material tube 21 covers the first-layer composite material tube 20 and covers the outer walls of the nested connection part 14 and the screwing part 15 exposed on the side of the nested connection part 14 close to the metal joint 11.

[0048] In some alternative embodiments, the thickness of the second composite material tube 21 corresponding to the annular groove 18 matches the annular groove 18.

[0049] In some alternative embodiments, as Figure 6 shown, the second-layer composite material tube 21 includes at least one layer of axially arranged composite material 22 and at least one layer of circumferentially arranged composite material 23 provided corresponding to the annular groove 18, and the axially arranged composite material 22 and the circumferentially arranged composite material 23 are arranged alternately.

[0050] In some alternative embodiments, the outer diameter of the composite material layer 13 is more than 6 mm larger than the outer diameter of the nested tube 12, and the outer diameter of the first-layer composite material tube 20 is more than 2 mm larger than the outer diameter of the nested tube 12.

[0051] In some alternative embodiments, the material of the composite material layer 13 includes a carbon fiber composite material. The carbon fiber composite material may include carbon cloth and an adhesive. Here, the specific model of the carbon fiber of the carbon cloth can be selected according to actual needs, and the force-bearing direction of the carbon fiber can be set corresponding to the specific structure of the composite material layer 13.

[0052] Compared with the traditional connection method, the composite material rod of the embodiment of the present application can improve the bearing capacity between the composite material and the metal joint. Through actual manufacturing measurement, compared with the traditional connection method, the connection strength of the rod cross-section can be increased by more than 1.7 times.

[0053] An embodiment of the present application provides a manufacturing method for the composite material rod in the above embodiment, including:

[0054] Provide an embedded sleeve 12, the end of the embedded sleeve 12 is provided with a nested connection part 14, the inner wall of the nested connection part 14 is provided with internal threads, and the outer wall is provided with a groove structure.

[0055] Set a composite material layer 13 on the surface of the embedded sleeve 12, the composite material layer 13 covers the embedded sleeve 12 and the nested connection part 14, and is at least partially located on one side of the end of the nested connection part.

[0056] Provide a metal joint 11, the end of the metal joint 11 is provided with a screwing part 15, and at least part of the outer wall of the screwing part 15 is provided with external threads.

[0057] Fasten and connect the external threads of the screwing part 15 corresponding to the internal threads of the nested connection part 14, and at least part of the outer wall of the screwing part 15 is exposed on the side close to the metal joint 11 of the nested connection part and is covered by the composite material layer 13.

[0058] The above description is only the preferred embodiment of the present application and the description of the applied technical principles. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosure concept. For example, the above features are mutually replaced with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A composite material rod, characterized in that, Comprising: A metal joint, a ferrule, and a composite material layer; wherein: A nested connection part is provided at the end of the ferrule, and an internal thread is provided on the inner wall of the nested connection part, and a groove structure is provided on the outer wall; A screwing part is provided at the end of the metal joint, and an external thread is provided on at least part of the outer wall of the screwing part. The screwing part is tightly connected to the internal thread of the nested connection part through the external thread, and at least part of the outer wall of the screwing part is exposed on the side of the nested connection part close to the metal joint; The composite material layer covers the ferrule and the nested connection part, and covers the outer wall of the screwing part exposed on the side of the nested connection part close to the metal joint; The groove structure includes at least two axially distributed annular grooves, and protrusions are provided on both sides of the annular grooves, and the protrusions protrude relative to the outer wall of the ferrule; The composite material layer includes a first-layer composite material tube and a second-layer composite material tube; The first-layer composite material tube covers the outer wall of the ferrule and abuts against the protrusion at one end of the groove structure, and the end of the protrusion is coplanar with the surface of the first-layer composite material tube; The second-layer composite material tube covers the first-layer composite material tube, and covers the nested connection part and the outer wall of the screwing part exposed on the side of the nested connection part close to the metal joint.

2. The composite material rod according to claim 1, characterized in that, The nested connection part and the ferrule are of an integral structure.

3. The composite material rod according to claim 1, characterized in that, The composite material layer and the outer wall of the screwing part exposed on the side of the nested connection part close to the metal joint are connected by an adhesive.

4. The composite material rod according to claim 1, characterized in that, The thickness of the second-layer composite material tube corresponding to the annular groove matches the annular groove.

5. The composite material rod according to claim 4, characterized in that, The second-layer composite material tube includes at least one layer of axial composite material and at least one layer of circumferential composite material provided corresponding to the annular groove, and the axial composite material and the circumferential composite material are arranged alternately.

6. The composite material rod according to claim 5, wherein The outer diameter of the composite material layer is more than 6 mm larger than the outer diameter of the ferrule, and the outer diameter of the first-layer composite material tube is more than 2 mm larger than the outer diameter of the ferrule.

7. The composite material rod according to any one of claims 1 to 6, characterized in that, The material of the composite material layer includes carbon fiber composite material.

8. A manufacturing method of a composite material rod, characterized in that, For manufacturing the composite material rod according to any one of claims 1 to 7, the method includes: Providing a ferrule, a nested connection part is provided at the end of the ferrule, and an internal thread is provided on the inner wall of the nested connection part, and a groove structure is provided on the outer wall; Setting a composite material layer on the surface of the ferrule, the composite material layer covers the ferrule and the nested connection part, and is at least partially located on one side of the end of the nested connection part; Providing a metal joint, a screwing part is provided at the end of the metal joint, and an external thread is provided on at least part of the outer wall of the screwing part; Tightly connecting the external thread of the screwing part to the internal thread of the nested connection part, and at least part of the outer wall of the screwing part is exposed on the side of the nested connection part close to the metal joint and is covered by the composite material layer.

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