CN115930015B - Flexible connection structure of composite material thin-wall round tube and forming method thereof - Google Patents
Flexible connection structure of composite material thin-wall round tube and forming method thereof Download PDFInfo
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- CN115930015B CN115930015B CN202211564758.9A CN202211564758A CN115930015B CN 115930015 B CN115930015 B CN 115930015B CN 202211564758 A CN202211564758 A CN 202211564758A CN 115930015 B CN115930015 B CN 115930015B
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Abstract
本发明公开了一种复合材料薄壁圆管的柔性连接结构，包括多节圆管和用于连接相邻圆管的金属圆环；所述金属圆环的外缘向外延伸形成有台肩，所述台肩的壁厚大于所述金属圆环的壁厚；所述圆管上设有止口，所述金属圆环通过所述台肩加胶过盈装配在所述圆管的止口上，所述圆管和所述金属圆环的连接处缠绕有复合材料层。本发明解决了传统连接结构其连接强度低、结构密封性差等问题，同时具有良好的装配工艺性，可以在装配过程中避免金属圆环的损伤。
The present invention discloses a flexible connection structure of a composite material thin-walled circular tube, comprising a plurality of circular tubes and a metal ring for connecting adjacent circular tubes; the outer edge of the metal ring extends outward to form a shoulder, the wall thickness of the shoulder is greater than the wall thickness of the metal ring; a stopper is provided on the circular tube, the metal ring is fitted on the stopper of the circular tube by gluing the shoulder, and a composite material layer is wound around the connection between the circular tube and the metal ring. The present invention solves the problems of low connection strength and poor structural sealing of the traditional connection structure, and at the same time has good assembly processability, and can avoid damage to the metal ring during the assembly process.
Description
Technical Field
The invention belongs to the technical field of mechanical structures, and particularly relates to a flexible connection structure of a thin-wall round tube made of composite materials.
Background
In current advanced mechanical structural designs, high specific strength composite materials are often used for the mechanical body structure in order to obtain better structural strength. Compared with the traditional metal structure, the metal structure can meet the use requirement under a harsher load environment. However, due to the limitations of materials and technology, metal components are still used for the connection between the components in such mechanical structures, and there is a problem of connection fit between the composite material and the metal two different materials, also called a flexible connection problem. The composite round tubes are used as a typical mechanical part, a plurality of sections of round tubes are often connected in order to meet the expected functional requirements, and the design of a flexible connection structure between the composite round tubes is particularly important in order to ensure that the whole formed by the plurality of sections of composite round tubes has good strength, rigidity and deformation coordination performance.
The difficulty of solving the technical problems is that:
The connection between the composite round tubes adopts a metal ring, and the connection design needs to solve three key technical problems. The novel composite round pipe connecting component has the advantages that the novel composite round pipe connecting component has enough connecting strength, a traditional connecting scheme generally adopts a simple butt joint structure, the outer side is wrapped with fibers for winding, the connecting strength is low, the problem that the structure is unstable and even loosens easily occurs in the service process is solved, the novel composite round pipe connecting component has good structural tightness, the whole multi-section composite round pipe is guaranteed not to leak air in the use process, the novel composite round pipe connecting component has good assembly manufacturability, the traditional connecting structure can only meet small interference fit below 0.5mm, and in the manufacturing and use of the advanced composite round pipe connecting component, the large interference fit above 0.5mm between the round ring and the composite round pipe is required to be realized under the condition that the metal ring with relatively weak strength is not damaged.
The significance of solving the technical problems is that:
In order to achieve the technical requirements, the invention designs a novel flexible connection structure between the multi-section composite round tubes, which can solve the problems of low connection strength, poor structural tightness and the like of the traditional connection structure, has good assembly manufacturability, and can avoid the damage of metal rings in the assembly process.
Disclosure of Invention
According to the problems, the invention provides a flexible connection structure of a thin-walled circular tube made of a composite material and a forming method thereof.
The technical scheme of the invention is as follows:
A flexible connection structure of a composite material thin-wall round pipe comprises a plurality of sections of round pipes and a metal ring for connecting adjacent round pipes;
the outer edge of the metal ring extends outwards to form a shoulder, and the wall thickness of the shoulder is larger than that of the metal ring;
The circular tube is provided with a spigot, the metal circular ring is assembled on the spigot of the circular tube in an interference manner through the shoulder glue adding manner, and a composite material layer is wound at the joint of the circular tube and the metal circular ring.
Preferably, the length of the spigot is 400-600 m, and the wall thickness is 5-6 mm.
Preferably, the length of the shoulder is 20% -30% of the total length of the circular tube, and the wall thickness of the shoulder is thickened by 1% -3 mm compared with the spigot of the circular tube.
Preferably, the metal ring body is made of high-strength aluminum alloy, titanium alloy or structural steel.
Preferably, the composite material layer comprises a glass fiber circumferential layer, a glass fiber angle layer and a carbon fiber circumferential layer which are sequentially wound at the joint of the metal circular ring and the circular tube.
Further preferably, the thickness of the glass fiber circumferential layer is 2-4 mm, the connection part of the metal ring and the round tube is wound and covered in a circumferential direction of 90 degrees, the winding tension is 50-100N, and the layer-by-layer tension is reduced according to a certain proportion so as to achieve the effect that the residual tension of each layer is the same.
Further preferably, the thickness of the glass fiber angle layer is 1-3 mm, and the glass fiber angle layer is wound and covered on the outer side of the glass fiber circumferential layer according to a certain angle.
Further preferably, the winding angle of the glass fiber angle layer is 50-80 degrees.
Further preferably, the thickness of the carbon fiber circumferential layer is 5-10 mm, the circumferential 90-degree winding is covered on the outer side of the glass fiber angle layer, the winding tension is 40-180N, and the layer-by-layer tension is decreased according to a certain proportion so as to achieve the effect that the residual tension of each layer is the same.
The second object of the invention is:
A method for forming a flexible connection structure of a thin-walled circular tube made of composite materials comprises the following steps:
S101, gluing the seam allowance of the round pipe, sleeving one section of the round pipe on a core mold, pushing the shoulder of the metal ring through an auxiliary clamp, assembling the metal ring on the seam allowance of the round pipe in an interference manner, and pushing another section of the round pipe on the core mold;
s102, waiting for gluing and curing;
And S103, sequentially winding a glass fiber circumferential layer, a glass fiber angle layer and a carbon fiber circumferential layer at the joint of the metal ring and the circular tube, and curing to form a flexible connection structure for connecting the metal ring and the circular tube.
The invention has the advantages and beneficial effects that:
1. the connection strength is high.
The glass fiber circumferential layer is used for applying prestress to the circular tube and the metal ring which are relatively weak in the inner part, so that structural stress of the circular tube and the metal ring in the service process is reduced, and the strength safety margin of the connecting part is improved. The glass fiber angle layer is used for enhancing the axial rigidity of the connecting part of the metal ring and the circular pipe spigot, and can effectively reduce structural damage of the circular pipe made of the composite material caused by middle bending in the service process. The carbon fiber circumferential layer has larger thickness and proper winding tension, can effectively protect all parts such as the inner circular tube, the metal circular ring, the glass fiber composite material layer and the like, and improves the integral strength reliability of the connecting parts.
2. The sealing performance is good. In the invention, the outer side of the round pipe spigot and the inner side of the metal ring of the composite material form a sealing surface, and the sealing surface has high enough contact pressure under the action of high-tension winding of glass fiber so as to achieve good sealing effect. The shoulder of the metal ring can limit the axial displacement of the metal ring of the round tube made of the composite material under a complex load environment, prevent the structure from loosening, prolong the length of a potential air leakage channel and further improve the tightness of the connecting part.
3. The assembly process is good. In the invention, the shoulder of the metal ring is used for bearing axial assembly force in the assembly process, so that the stress on the relatively weak annular corrugation of the metal ring is avoided, and the assembly effect is ensured. The long spigot of the circular tube can effectively increase the matching area of the metal circular ring and the circular tube, is favorable for axial guiding during plug-in assembly, and further improves the integral straightness and coaxiality of the assembled connecting part.
Drawings
The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for the purpose of illustration only and thus are not limiting the scope of the present invention. Moreover, unless specifically indicated otherwise, the drawings are intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.
Fig. 1 is a schematic plan view of the present invention.
In the figure:
1-metal circular ring, 2-circular tube, 3-shoulder, 4-glass fiber circumferential layer, 5-glass fiber angle layer and 6-carbon fiber circumferential layer.
Detailed Description
First, it should be noted that the following detailed description of the specific structure, characteristics, advantages, and the like of the present invention will be given by way of example, however, all descriptions are merely illustrative, and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implied in the embodiments mentioned herein, or any single feature shown or implied in the figures, may nevertheless be continued in any combination or pruning between these features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity of the drawing, identical or similar features may be indicated at one point in the same drawing.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, or indirectly connected through an intermediate medium, and may be a communication between two elements or an interaction relationship between two elements, unless explicitly specified otherwise, and it will be understood by those of ordinary skill in the art that the above terms are in specific terms of the present invention as appropriate.
The present invention will be described in detail with reference to fig. 1.
Example 1:
a flexible connection structure of a composite material thin-wall round tube comprises a plurality of sections of round tubes 2 and a metal ring 1 for connecting adjacent round tubes 2;
the outer edge of the metal ring 1 extends outwards to form a shoulder 3, and the wall thickness of the shoulder 3 is larger than that of the metal ring 1;
The round pipe 2 is provided with a spigot, the metal ring 1 is assembled on the spigot of the round pipe 2 in an interference mode through the shoulder 3, and a composite material layer is wound at the joint of the round pipe 2 and the metal ring 1.
The working process comprises the following steps:
In this embodiment, as shown in fig. 1, the flexible connection structure includes 2 sections of round pipes 2, the round pipes 2 are made of composite materials, the 2 sections of round pipes 2 are connected by using a metal ring 1, during operation, one section of round pipe 2 is sleeved on a core mold, a shoulder 3 of the metal ring 1 is pushed by an auxiliary clamp, the metal ring 1 is assembled on a spigot of the round pipe 2 by glue adding interference, and then another section of round pipe 2 is pushed on the core mold. Wherein if the metal ring 1 is required to be firmly connected and have better assembly lubricity, the seam allowance of the round tube 2 can be coated with glue, and then the process is performed. After the glue is solidified, a glass fiber and carbon fiber double-layer composite material layer is wound at the joint of the circular tube 2 and the metal circular ring 1, and a connecting piece of the metal circular ring and the circular tube is formed after the solidification is completed. The composite material layer has the characteristics of high strength and wear resistance, can effectively protect the inside, and reduces the structural stress of each part such as the metal ring 1, the round tube 2 and the like in the service process.
Further, in an embodiment, it may be considered that the length of the spigot is 400-600 m, and the wall thickness is 5-6 mm. The long spigot of the circular tube 2 can effectively increase the matching area of the metal circular ring 1 and the circular tube 2 and is used for axial guiding of splicing assembly.
Further, in an embodiment, it may be further considered that the length of the shoulder 3 is 20% -30% of the total length of the circular tube 2, and the wall thickness of the shoulder 3 is thicker than the spigot of the circular tube 2 by 1-3 mm. The shoulder 3 of the metal ring 1 is used for bearing axial assembly force in the assembly process, so that the stress of the circumferential corrugation of the metal ring 1 is avoided, the axial displacement of the metal ring 1 of the round tube 2 in a complex load environment can be limited, the structure is prevented from loosening, the length of a potential leakage channel is prolonged, and the tightness of a connecting structure is improved.
Further, in the embodiment, it may be considered that the main body of the metal ring 1 is made of high-strength aluminum alloy, titanium alloy or structural steel, so as to improve the structural strength of the metal ring 1.
Further, it is also contemplated in the embodiment that the composite material layer includes a glass fiber circumferential layer 4, a glass fiber angle layer 5, and a carbon fiber circumferential layer 6 sequentially wound around the connection portion of the metal ring 1 and the round tube 2. In this embodiment, the composite material layer is a glass fiber and carbon fiber double-layer composite material layer, wherein the glass fiber composite material layer comprises a glass fiber circumferential layer 4 and a glass fiber angle layer 5, and the carbon fiber composite material layer comprises a carbon fiber circumferential layer 6.
Furthermore, in an embodiment, it may be further considered that the thickness of the glass fiber circumferential layer 4 is 2-4 mm, the circumferential 90 ° winding covers the connection between the metal ring 1 and the round tube 2, the winding tension is 50-100 n, and the layer-by-layer tension is decreased according to a certain proportion so as to achieve the same effect of the residual tension of each layer.
Further, in an embodiment, it may be further considered that the glass fiber angle layer has a thickness of 1 to 3mm, and is wound around and covered on the outer side of the glass fiber circumferential layer 4 at a certain angle.
Further, it is also contemplated in the embodiment that the winding angle of the glass fiber angle layer is 50 ° to 80 °.
Furthermore, in an embodiment, it may be considered that the thickness of the carbon fiber circumferential layer 6 is 5-10 mm, the circumferential direction is wound and covered on the outer side of the glass fiber angle layer by 90 ° with winding tension of 40-180 n, and the layer-by-layer tension is decreased according to a certain proportion so as to achieve the same effect of the residual tension of each layer.
In this embodiment, the glass fiber circumferential layer 4 adopts a large tension winding process, applies a certain prestress to the metal ring 1, effectively enhances the connection strength of the mating surface of the metal ring 1 and the spigot of the circular tube 2, and obtains good structural tightness. The glass fiber angle layer 5 is used for enhancing the axial rigidity of the connecting part of the metal ring 1, and effectively reducing the structural damage of the round tube 2 caused by middle bending in the service process. The carbon fiber circumferential layer 6 has larger thickness and proper winding tension, can effectively protect all parts inside, and reduces the structural stress of all parts such as the metal ring 1, the round tube 2 and the like in the service process.
Example 2:
A method for forming a flexible connection structure of a thin-walled circular tube made of composite materials comprises the following steps:
s101, gluing the seam allowance of the round tube 2, sleeving one section of the round tube 2 on a core die, pushing the shoulder 3 of the metal ring 1 through an auxiliary clamp, gluing the metal ring 1 on the seam allowance of the round tube 2 in an interference fit mode, and pushing another section of the round tube 2 on the core die;
s102, waiting for gluing and curing;
S103, sequentially winding a glass fiber circumferential layer 4, a glass fiber angle layer 5 and a carbon fiber circumferential layer 6 at the joint of the metal ring 1 and the circular tube 2, and curing to form a flexible connection structure for connecting the metal ring 1 and the circular tube 2.
Application example 1:
A flexible connection structure prepared using the flexible connection structure molding method of the composite material thin-walled round tube in example 2, wherein:
The selected size parameters of the round tube 2 are that the spigot length is 400mm and the wall thickness is 5mm;
the shoulder 3 is selected with the dimension parameters of 80mm in length and 8mm in wall thickness;
Parameters of the glass fiber circumferential layer 4 are thickness 2mm, winding 10 layers, and winding tension of each layer is 86N/85N/84N/82N/81N/80N/79N/78N/77N/76N;
parameters of the glass fiber angle layer 5 are thickness 1mm, angle 70 degrees and winding tension 60N;
The parameters of the carbon fiber circumferential layer 6 are that the thickness is 5mm, the winding tension of each layer is 172N/172N/164N/156N/148N/140N/133N/125N/118N/111N/104N/97N/84N/77N/71N/65N/58N/52N/46N.
According to the above example, under the normal use condition of the composite material thin-wall round tube, a flexible connection structure is adopted, and the advantages are that:
(1) The connection strength is higher. The torsional failure load limit of the above examples may be increased by about 20% and the tensile failure load limit may be increased by about 40% over conventional butt-joint, shouldereless, or fiber-free high tension wound connection structures. The metal ring 1 and the round tube 2 can additionally obtain about 250MPa of prestress, and meanwhile, the residual tension of each layer of the glass fiber composite material is equal to about 50N, and the residual tension of each layer of the carbon fiber composite material is equal to about 40N. And the residual tension can effectively improve the load of the first layer failure under the working state of the connecting part. The above example has higher connection strength than the conventional connection structure.
(2) The sealing performance is better. Compared with the traditional butt joint structure, the shouldereless structure or the connection structure without fiber and large-tension winding, under the test of the helium mass spectrometer leak detector, the vacuum single-point leak rate of the above example can be improved from 10 -4Pa·m3/s to more than 10 - 6Pa·m3/s, and the use requirement of a more severe vacuum sealing environment can be met.
(3) The assembly manufacturability is better. Compared with the traditional butt joint structure, the shouldereless structure or the connection structure wound by the fiber under large tension, the assembly with larger interference magnitude of more than 0.5mm can be met by the above example, and the annular corrugation of the relatively weak metal round tube in the assembly process is ensured not to be deformed or even damaged greatly.
In summary, the invention provides a flexible connection structure of a thin-walled circular tube made of a composite material and a forming method thereof.
The foregoing examples illustrate the invention in detail, but are merely preferred embodiments of the invention and are not to be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (4)
1. A flexible connection structure of a composite material thin-wall round pipe is characterized by comprising a plurality of sections of round pipes and a metal ring for connecting adjacent round pipes;
the outer edge of the metal ring extends outwards to form a shoulder, and the wall thickness of the shoulder is larger than that of the metal ring;
the circular tube is provided with a spigot, the metal circular ring is assembled on the spigot of the circular tube in an interference manner through the shoulder glue adding manner, and a composite material layer is wound at the joint of the circular tube and the metal circular ring;
the composite material layer comprises a glass fiber circumferential layer, a glass fiber angle layer and a carbon fiber circumferential layer which are sequentially wound at the joint of the metal circular ring and the circular tube;
the thickness of the glass fiber circumferential layer is 2-4 mm, the connection part of the metal ring and the round tube is covered by circumferential 90-degree winding, the winding tension is 50-100N, and the layer-by-layer tension is reduced according to a certain proportion so as to achieve the effect that the residual tension of each layer is the same;
The thickness of the glass fiber angle layer is 1-3 mm, and the glass fiber angle layer is wound and covered on the outer side of the glass fiber circumferential layer according to a certain angle;
the winding angle of the glass fiber angle layer is 50-80 degrees;
The thickness of the carbon fiber circumferential layer is 5-10 mm, the circumferential direction is wound and covered on the outer side of the glass fiber angle layer at 90 degrees, the winding tension is 40-180N, and the layer-by-layer tension is reduced according to a certain proportion so as to achieve the effect that the residual tension of each layer is the same.
2. The flexible connection structure of a composite material thin-walled circular tube as claimed in claim 1, wherein the length of the shoulder is 20% -30% of the total length of the circular tube, and the wall thickness of the shoulder is 1-3 mm thicker than the spigot of the circular tube.
3. The flexible connection structure of a composite material thin-walled circular tube as claimed in claim 2, wherein the metal circular ring main body is made of high-strength aluminum alloy, titanium alloy or structural steel.
4. A method for forming a flexible connection structure of a thin-walled circular tube made of a composite material as set forth in claim 3 is characterized by comprising the following steps:
S101, gluing the seam allowance of the round pipe, sleeving one section of the round pipe on a core mold, pushing the shoulder of the metal ring through an auxiliary clamp, assembling the metal ring on the seam allowance of the round pipe in an interference manner, and pushing another section of the round pipe on the core mold;
s102, waiting for gluing and curing;
And S103, sequentially winding a glass fiber circumferential layer, a glass fiber angle layer and a carbon fiber circumferential layer at the joint of the metal ring and the circular tube, and curing to form a flexible connection structure for connecting the metal ring and the circular tube.
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| CN215488175U (en) * | 2021-07-22 | 2022-01-11 | 中国石油化工股份有限公司 | Oil pipeline fire-free connecting device |
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| EP0865613A1 (en) * | 1995-12-05 | 1998-09-23 | Lwt Instruments Inc. | Composite material structures having reduced signal attenuation |
| JP5856447B2 (en) * | 2011-11-17 | 2016-02-09 | サムテック株式会社 | Long high pressure vessel |
| ITMI20120973A1 (en) * | 2012-06-05 | 2013-12-06 | Cifa Spa | PIPING FOR ABRASIVE MATERIALS, WHICH CONCRETE OR SIMILAR MATERIALS, AND ITS IMPLEMENTATION PROCEDURE |
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| CN215488175U (en) * | 2021-07-22 | 2022-01-11 | 中国石油化工股份有限公司 | Oil pipeline fire-free connecting device |
Non-Patent Citations (1)
| Title |
|---|
| 基于遗传算法的柔性连接件多目标优化设计;杨子龙、舒朝霞;中国核科学技术进展报告（第六卷）——中国核学会2019年学术年会论文集第4册（同位素分离分卷）;20200430;第六卷;第61-65页 * |
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