Composite bogie antenna mounting beam and manufacturing method

Abstract

The application discloses a composite bogie antenna mounting beam and a manufacturing method, and relates to the technical field of railway vehicles. The application solves the problems of complex structure, large weight and easy cracking of the existing antenna mounting beam, improves the overall rigidity and reduces the overall weight. The specific scheme is as follows: the beam, the mounting bracket and the antenna mounting seat are made of composite materials, are integrally formed, the mounting bracket is fixedly arranged at the two ends of the horizontal beam, the antenna mounting seat is fixedly arranged at the middle position of the horizontal beam, at least one mounting hole and one process hole are arranged on the mounting bracket and the antenna mounting seat, and the horizontal beam, the mounting bracket and the antenna mounting seat are hollow and communicated.

Description

Technical Field

[0001] This invention relates to the field of railway vehicle technology, and in particular to a composite material bogie antenna mounting beam and its manufacturing method. Background Technology

[0002] A railway vehicle bogie includes a frame and wheels. The frame includes a central crossbeam and side beams. The side beams are located at both ends of the central crossbeam. The railway vehicle bogie also includes an antenna mounting beam, the two ends of which are connected to the ends of the side beams.

[0003] The inventors discovered that existing bogie antenna mounting beams are mainly metal welded structures, with obvious stress concentration at the welds, which can lead to weld cracking and structural fatigue failure due to severe vibration. Some existing technologies have replaced some components of the antenna mounting beam with composite materials, but they have not been designed from the perspective of overall molding, resulting in insignificant weight reduction and still a large number of connections, failing to fundamentally solve the problem of structural complexity. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a composite material bogie antenna mounting beam and its manufacturing method. The beam is made of composite material, and the horizontal beam, mounting bracket, and antenna mounting base are integrally formed, resulting in a hollow interior for the bogie antenna mounting beam. This eliminates weld seams and solves the problems of complex structure, heavy weight, and susceptibility to cracking in existing antenna mounting beams.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] In a first aspect, the present invention provides a composite material bogie antenna mounting beam, comprising a horizontal beam, a mounting bracket, and an antenna mounting base made of composite material. The horizontal beam, the mounting bracket, and the antenna mounting base are integrally formed. The mounting bracket is fixedly disposed at both ends of the horizontal beam, and the antenna mounting base is fixedly disposed at the middle position of the horizontal beam. Each of the mounting bracket and the antenna mounting base has at least one mounting hole and a process hole. The horizontal beam, the mounting bracket, and the antenna mounting base are hollow and interconnected internally.

[0007] As a further implementation, the bogie antenna mounting beam is formed by the docking of the first antenna mounting beam unit and the second antenna mounting beam unit, with the docking point between the first antenna mounting beam unit and the second antenna mounting beam unit being the parting surface.

[0008] As a further implementation, the outermost layer of the first antenna mounting beam unit and the second antenna mounting beam unit are both carbon fiber woven fabric, and the innermost layer is both carbon fiber unidirectional tape. Between the outermost layer and the innermost layer, there is at least one set of layered carbon fiber unidirectional tape-glass fiber woven fabric laid from the outside to the inside.

[0009] As a further implementation, the wall thickness of the first antenna mounting beam unit is greater than that of the second antenna mounting beam unit.

[0010] As a further implementation, the outer surfaces of the first antenna mounting beam unit and the second antenna mounting beam unit are flush, and the plies of the two antenna mounting beam units are aligned one by one from the outside to the inside. The excess plies on the first antenna mounting beam unit are respectively fixedly connected to the inner surface of the second antenna mounting beam unit.

[0011] As a further implementation, the main body of the horizontal beam is a hollow square column structure, with both ends of the main body of the horizontal beam angled upwards and fixedly connected to the mounting bracket.

[0012] As a further implementation, the end of the mounting bracket connected to the bogie side beam is a vertical plane and the plane is square, and the mounting bracket as a whole is a variable cross-section structure.

[0013] As a further implementation, a boss-shaped gasket is installed in the mounting hole, with the small-diameter portion of the gasket inserted into the mounting hole for transmitting fastening pressure.

[0014] Secondly, the present invention provides a method for manufacturing a composite material bogie antenna mounting beam, specifically as follows: a first antenna mounting beam unit and a second antenna mounting beam unit are manufactured separately, and the first antenna mounting beam unit and the second antenna mounting beam unit are combined and formed by a combination of molding and bag pressing.

[0015] As a further implementation method, the first antenna mounting beam unit and the second antenna mounting beam unit are respectively laid in the upper mold and the lower mold. Before the mold is closed, an air bag is placed in the cavity. When the mold is closed, the layup of the first antenna mounting beam unit and the second antenna mounting beam unit are aligned one by one along the outer surface to the inner surface. The excess layup of the first antenna mounting beam unit is fixedly connected to the inner surface of the second antenna mounting beam unit. After the mold is closed, molding and air inflation are performed in one integrated curing process.

[0016] The beneficial effects of the present invention are as follows:

[0017] (1) The present invention is made of composite materials and integrates the horizontal beam, mounting bracket and antenna mounting seat into one piece, making the interior of the bogie antenna mounting beam hollow, eliminating the splicing and welding of steel plates at the mounting bracket and antenna mounting seat, reducing the connection positions, eliminating welds, improving the overall rigidity of the antenna mounting beam while reducing the overall weight.

[0018] (2) The carbon fiber unidirectional strip in the first antenna mounting beam unit and the second antenna mounting beam unit of the present invention makes the maximum use of the anisotropy of the composite material, realizes the lightweight design of the force flow, and introduces glass fiber woven cloth to improve the overall impact resistance and fatigue resistance of the bogie antenna mounting beam. The carbon fiber woven cloth ensures the appearance of the visible surface of the outer layer of the bogie antenna mounting beam.

[0019] (3) The outer surfaces of the first antenna mounting beam unit and the second antenna mounting beam unit are flush, and the plies of the two antenna mounting beam units are aligned one by one from the outside to the inside. The excess plies on the first antenna mounting beam unit are fixedly connected to the inner surface of the second antenna mounting beam unit in sequence, thereby realizing the continuity of fibers at the parting surface and giving full play to its enhancement effect.

[0020] (4) The mounting hole of the present invention is equipped with a boss-shaped gasket. The bolt tightening pressure is transmitted through the gasket, which avoids the composite board being directly compressed, thereby avoiding local stress concentration damage to the mounting hole. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] Figure 1 This is a schematic diagram of the overall structure of a composite material bogie antenna mounting beam according to one or more embodiments of the present invention;

[0023] Figure 2 This is a partial cross-sectional structural diagram of the parting surface location according to one or more embodiments of the present invention;

[0024] Figure 3 This is a partial cross-sectional structural diagram of the mounting hole location according to one or more embodiments of the present invention;

[0025] In the diagram: the spacing or dimensions between parts have been exaggerated to show their positions; the diagram is for illustrative purposes only.

[0026] Among them, 1. Horizontal beam; 2. Mounting bracket; 3. Antenna mounting base; 4. First mounting hole; 5. First process hole; 6. Second mounting hole; 7. Second process hole; 8. Gasket; 9. Parting surface. Detailed Implementation

[0027] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0028] As described in the background section, existing bogie antenna mounting beams are mainly metal welded structures, with significant stress concentration at the welds, leading to weld cracking due to severe vibration and structural fatigue failure. Some existing technologies have replaced some components of the antenna mounting beam with composite materials, but they have not been designed from the perspective of overall molding, resulting in insignificant weight reduction and the presence of numerous connections, failing to fundamentally solve the problem of structural complexity. To address the above technical issues, this invention proposes a composite material bogie antenna mounting beam and its manufacturing method.

[0029] Example 1

[0030] In a typical embodiment of the present invention, such as Figures 1-3 As shown, a composite material bogie antenna mounting beam is proposed. The bogie antenna mounting beam is composed of two parts joined together. For ease of understanding, this embodiment is described using the first antenna mounting beam unit and the second antenna mounting beam unit. The joint between the first antenna mounting beam unit and the second antenna mounting beam unit is the parting surface 9.

[0031] The bogie antenna mounting beam includes a horizontal beam 1, a mounting bracket 2, and an antenna mounting base 3. The horizontal beam 1, the mounting bracket 2, and the antenna mounting base 3 are all made of composite materials and are integrally molded, making the overall structure a variable cross-section closed cavity structure to improve the overall rigidity of the bogie antenna mounting beam.

[0032] There are two mounting brackets 2, which are fixedly installed at both ends of the horizontal beam 1 and are mainly used for connecting with the side beam of the bogie; the antenna mounting base 3 is fixedly installed at the middle position of the horizontal beam 1 and is mainly used for the installation of signal transceiver antennas in the railway vehicle signaling system.

[0033] Both the mounting bracket 2 and the antenna mounting base 3 are provided with mounting holes and process holes for mounting the mounting bracket 2, the antenna mounting base 3 and other components. Specifically, the mounting bracket 2 is provided with at least one first mounting hole 4 and a first process hole 5, which are arranged opposite to each other on both sides of the mounting bracket 2. The antenna mounting base 3 is provided with at least one second mounting hole 6 and a second process hole 7, which are arranged opposite to each other on both sides of the antenna mounting base 3.

[0034] It is understandable that the number and location of mounting holes and process holes on mounting bracket 2 and antenna mounting base 3 can be determined according to actual design requirements, and no further restrictions are imposed here.

[0035] like Figure 1As shown, the main body of the horizontal beam 1 is a hollow square column structure. The two ends of the main body of the horizontal beam 1 are inclined upward to form end faces that connect with the mounting bracket 2. The mounting bracket 2 is fixedly installed at both ends of the horizontal beam 1 to enclose the interior of the horizontal beam 1.

[0036] The end of the mounting bracket 2 that connects to the side beam of the bogie is a vertical plane and this plane is square. The mounting bracket 2 as a whole is a variable cross-section structure. The end of the mounting bracket 2 that connects to the side beam of the bogie has the largest cross-sectional area, and the end that connects to the end of the horizontal beam 1 has the smallest cross-sectional area.

[0037] The interior of the mounting bracket 2 is hollow, and the internal space of the mounting bracket 2 is also a variable cross-section structure. The cross-sectional area of ​​the end of the mounting bracket 2 that is connected to the horizontal beam 1 is the same as that of the end of the horizontal beam 1.

[0038] The antenna mounting base 3 is also a variable cross-section structure and is hollow inside. The antenna mounting base 3 is fixedly installed at the bottom of the middle position of the horizontal beam 1. The interior of the antenna mounting base 3 and the mounting bracket 2 are connected to the interior of the horizontal beam 1.

[0039] The horizontal beam 1, mounting bracket 2, and antenna mounting base 3 are integrally formed and are variable cross-section closed cavity structures. This changes the original bogie antenna mounting beam structure, eliminates the steel plate splicing and welding at the mounting bracket 2 and antenna mounting base 3, reduces connection positions, eliminates welds, improves overall rigidity, and reduces overall weight.

[0040] Both the first antenna mounting beam unit and the second antenna mounting beam unit are made of composite materials. Specifically, the outermost layer of both the first and second antenna mounting beam units is carbon fiber woven fabric, and the innermost layer is carbon fiber unidirectional tape. Between the outermost and innermost layers, there is at least one set of layered carbon fiber unidirectional tape-glass fiber woven fabric laid from the outside to the inside. The wall thickness of the first antenna mounting beam unit is greater than that of the second antenna mounting beam unit, that is, the first antenna mounting beam unit has more layers than the second antenna mounting beam unit.

[0041] In this embodiment, the first antenna mounting beam unit is ply-layered from the outside in as carbon fiber woven fabric - carbon fiber unidirectional tape - glass fiber woven fabric - carbon fiber unidirectional tape - glass fiber woven fabric - carbon fiber unidirectional tape. The second antenna mounting beam unit is ply-layered from the outside in as carbon fiber woven fabric - carbon fiber unidirectional tape - glass fiber woven fabric - carbon fiber unidirectional tape. The carbon fiber unidirectional tape, arranged according to the principal stress direction, makes maximum use of the anisotropy of the composite material, realizing a lightweight design that follows the force flow. The introduction of glass fiber woven fabric improves the overall impact resistance and fatigue resistance of the bogie antenna mounting beam. The carbon fiber woven fabric ensures the appearance of the visible outer layer of the bogie antenna mounting beam.

[0042] It is understood that, in other embodiments, the number of layers of the first antenna mounting beam unit and the second antenna mounting beam unit can be determined according to design requirements, and no further restrictions are imposed here.

[0043] like Figure 2 As shown, the bogie antenna mounting beam has a progressive layup structure at parting surface 9. Specifically, the wall thickness of the first antenna mounting beam unit is greater than that of the second antenna mounting beam unit. The outer surfaces (i.e., the outermost visible outer surfaces) of the first antenna mounting beam unit and the second antenna mounting beam unit are flush. From the outside to the inside, the layups of the first antenna mounting beam unit and the second antenna mounting beam unit are aligned one by one. The excess layups on the first antenna mounting beam unit are sequentially fixedly connected to the inner surface (i.e., the innermost surface) of the second antenna mounting beam unit, thereby achieving the continuity of fibers at parting surface 9 to fully exert its enhancement effect.

[0044] like Figure 3 As shown, a gasket 8 is also installed in the mounting hole. The gasket 8 has a boss-shaped structure and is made of metal. The small-diameter part of the gasket 8 is inserted into the mounting hole. The bolt tightening pressure is transmitted through the metal gasket, which avoids the composite board being directly compressed, thereby avoiding local stress concentration damage to the mounting hole.

[0045] Example 2

[0046] In a typical embodiment of the present invention, a method for manufacturing a composite material bogie antenna mounting beam is provided, the specific process of which is as follows:

[0047] The mounting bracket 2, horizontal beam 1, and antenna mounting base 3 of the bogie antenna mounting beam are structurally integrated using a combination of molding and bagging methods.

[0048] Specifically, the complex overall structure of the composite material bogie antenna mounting beam is divided into two parts: the first antenna mounting beam unit and the second antenna mounting beam unit, which are manufactured separately.

[0049] During the preparation process, the layers are first laid on the upper and lower mold surfaces according to the layup design sequence, and progressive layup is carried out at 9 points on the mold parting surface to achieve the continuity of each layup.

[0050] That is, the first antenna mounting beam unit is laid in the upper mold according to the layer design, so that the carbon fiber woven fabric of the first antenna mounting beam unit is attached to the inner surface of the upper mold, and then laid in the order of carbon fiber woven fabric-carbon fiber unidirectional tape-glass fiber woven fabric-carbon fiber unidirectional tape-glass fiber woven fabric-carbon fiber unidirectional tape.

[0051] The second antenna installation beam unit is laid in the lower mold according to the layer design, so that the carbon fiber woven fabric of the second antenna installation beam unit is attached to the inner surface of the lower mold. Then, it is laid in the order of carbon fiber woven fabric - carbon fiber unidirectional tape - glass fiber woven fabric - carbon fiber unidirectional tape.

[0052] Before mold assembly, pre-made air bags are placed in the cavities of the first antenna mounting beam unit and the second antenna mounting beam unit.

[0053] During mold closing, the plies of the first antenna mounting beam unit and the second antenna mounting beam unit are aligned one by one along the outer surface to the inner surface, and the excess plies of the first antenna mounting beam unit are fixedly connected to the innermost surface (inner surface) of the second antenna mounting beam unit.

[0054] After mold closing, molding and inflation are carried out in one step. The outer surface of the bogie antenna mounting beam is controlled by a mold composed of an upper mold and a lower mold, and the inner surface is pressured by an air bag.

[0055] It should be noted that during demolding, the air bag can be left inside the bogie antenna mounting beam or pulled out from the process hole. The specific method can be determined according to actual requirements, and no further restrictions are imposed here.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A composite material bogie antenna mounting beam, characterized in that, The device includes a horizontal beam, mounting bracket, and antenna mounting base made of composite materials. The horizontal beam, mounting bracket, and antenna mounting base are integrally formed. The mounting bracket is fixedly installed at both ends of the horizontal beam, and the antenna mounting base is fixedly installed at the middle position of the horizontal beam. Each mounting bracket and antenna mounting base has at least one mounting hole and one process hole. The horizontal beam, mounting bracket, and antenna mounting base are hollow and interconnected. The bogie antenna mounting beam is formed by connecting a first antenna mounting beam unit and a second antenna mounting beam unit. The outermost layer of the first antenna mounting beam unit and the second antenna mounting beam unit are both carbon fiber woven fabric, and the innermost layer is both carbon fiber unidirectional tape. Between the outermost layer and the innermost layer, there is at least one set of layered carbon fiber unidirectional tape-glass fiber woven fabric laid from the outside to the inside. The joint between the first antenna mounting beam unit and the second antenna mounting beam unit of the bogie antenna mounting beam is a parting surface; the wall thickness of the first antenna mounting beam unit is greater than that of the second antenna mounting beam unit; the outer surfaces of the first antenna mounting beam unit and the second antenna mounting beam unit are flush, and the plies of the two antenna mounting beam units are aligned one by one from the outside to the inside; the excess plies on the first antenna mounting beam unit are respectively fixedly connected to the inner surface of the second antenna mounting beam unit; the first antenna mounting beam unit and the second antenna mounting beam unit are combined and formed by a combination of molding and bag pressing.

2. The composite material bogie antenna mounting beam according to claim 1, characterized in that, The main body of the horizontal beam is a hollow square column structure, with both ends of the main body of the horizontal beam angled upwards and fixedly connected to the mounting bracket.

3. The composite material bogie antenna mounting beam according to claim 1, characterized in that, The end of the mounting bracket that connects to the side beam of the bogie is a vertical plane and the plane is square. The mounting bracket as a whole is a variable cross-section structure.

4. The composite material bogie antenna mounting beam according to claim 1, characterized in that, A boss-shaped gasket is installed in the mounting hole, and the small-diameter portion of the gasket is inserted into the mounting hole for transmitting tightening pressure.

5. A method for manufacturing a composite material bogie antenna mounting beam as described in any one of claims 1-4, characterized in that, Specifically, the first antenna mounting beam unit and the second antenna mounting beam unit are manufactured separately, and the first antenna mounting beam unit and the second antenna mounting beam unit are assembled by a combination of molding and bag pressing.

6. The method for manufacturing a composite material bogie antenna mounting beam according to claim 5, characterized in that, The first antenna mounting beam unit and the second antenna mounting beam unit are laid in the upper mold and the lower mold respectively. Before the mold is closed, an air bag is placed in the cavity. When the mold is closed, the layup of the first antenna mounting beam unit and the second antenna mounting beam unit are aligned one by one along the outer surface to the inner surface. The excess layup of the first antenna mounting beam unit is fixedly connected to the inner surface of the second antenna mounting beam unit. After the mold is closed, molding and air inflation are performed in one step to cure.

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