Rail transit vehicle mounting bracket and forming preparation method

Abstract

The present application relates to a kind of rail transit vehicle mounting bracket and forming preparation method, the integral shell structure made of fiber reinforced composite material, two ends are open setting, its top shell wall is used as the connecting wall of vehicle body with vehicle body, bottom shell wall is used as the equipment mounting wall with the antenna component cooperation of carrying, wherein, the ply thickness of top shell wall is greater than the ply thickness of bottom shell wall, the ply thickness of bottom shell wall is greater than the ply thickness of remaining two windward side shell walls, antenna installation area inside in the both ends of shell wall of shell structure is provided with sandwich, two windward side shell walls are provided with wind port, and flow guide pipe is arranged between corresponding wind port, the mounting bracket of the present application is light in weight, easy to install, avoids vibration cracking phenomenon, and high in use reliability.

Description

Technical Field

[0001] This invention relates to the field of rail transit technology, specifically to a rail transit vehicle mounting bracket and its molding and preparation method. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] The mounting brackets used to support antenna components on existing urban rail transit vehicles, subway cars, and EMU trains are mainly made of metal components, which have problems such as insufficient weight and installation convenience. Metal structures are formed by welding, which makes them prone to vibration and cracking. Furthermore, interference from other surrounding components makes it difficult for metal structures to be shaped in different forms. At the same time, considering factors such as weight, the metal brackets are not modally compatible with the vehicle body, resulting in resonance problems. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a rail transit vehicle mounting bracket and processing method, which is lightweight, easy to install, and will not cause vibration cracking.

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

[0006] In a first aspect, embodiments of the present invention provide a rail transit vehicle mounting bracket, which is an integral shell structure made of fiber-reinforced composite material, with open ends. The top shell wall is used to cooperate with the vehicle body as a vehicle body connecting wall, and the bottom shell wall is used to cooperate with the supported antenna components as an equipment mounting wall. The ply thickness of the top shell wall is greater than that of the bottom shell wall, and the ply thickness of the bottom shell wall is greater than that of the other two windward side shell walls. The antenna mounting areas at both ends of the shell structure are provided with a core, and the two windward side shell walls are provided with air passages, with guide pipes provided between the corresponding air passages.

[0007] Optionally, in each shell wall of the rail transit mounting bracket, the two outermost layers are made of glass fiber, and the remaining layers are made of carbon fiber.

[0008] Optionally, the ply thickness of the top shell wall is 4.5mm-5.5mm, preferably 5mm, the ply thickness of the bottom shell wall is 3.5mm-4.5mm, preferably 4mm, and the ply thickness of the two side shell walls is 2.5mm-3.5mm, preferably 3mm.

[0009] Optionally, the guide tube is fixedly connected to the side shell wall by rivets, and the guide tube is bonded to the side shell wall by adhesive.

[0010] Optionally, the windward side shell of the rail transit mounting bracket is provided with a binding hole.

[0011] Optionally, the top shell wall of the rail transit mounting bracket is provided with a clearance hole to avoid the bottom structure of the vehicle body.

[0012] Optionally, a composite material plate support frame is fixed to the surface of the central region of the shell structure. The composite material plate support frame is fixed to the inner side of the shell wall by rivets and bonded by adhesive.

[0013] Optionally, the sandwich core is made of PET foam.

[0014] Secondly, embodiments of the present invention provide a method for molding and preparing the rail transit vehicle mounting bracket as described in the first aspect, comprising the following steps:

[0015] A fiber fabric of a predetermined thickness is laid in the negative mold according to the pre-determined layup design requirements, and then injection is performed after the fiber fabric is laid.

[0016] After the injected resin has cured, the sandwich material is laid on top.

[0017] Continue laying the fiber fabric according to the predetermined layup design requirements until the target thickness required by the layup design is achieved, and then perform a second infusion.

[0018] After the resin material injected in the second stage cures, it forms a semi-finished mounting bracket.

[0019] The target holes are machined into the semi-finished mounting bracket, and the guide pipe is fixed between the two corresponding air inlets.

[0020] Optionally, the cured resin material can be sanded before laying the core material.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. The mounting bracket of the present invention adopts an integrated shell structure made of fiber-reinforced composite material, instead of a welded metal structure, thus avoiding the welding points of the metal frame structure and further avoiding the vibration cracking phenomenon of the metal structure. It has good reliability and is lightweight and easy to install because it is made of fiber-reinforced composite material.

[0023] 2. The mounting bracket of the present invention has a top shell wall that cooperates with the vehicle body as a vehicle body connection wall, and a bottom shell wall that cooperates with the antenna component as an equipment mounting wall. The ply thickness of the top shell wall is greater than that of the bottom shell wall, and the ply thickness of the bottom shell wall is greater than that of the other two windward side shell walls, thus realizing a variable stiffness ply design. The antenna mounting areas at both ends of the shell structure are provided with a core to strengthen the structure, ensure the stability of the load-bearing capacity, and match the mode of the vehicle body, thus avoiding resonance.

[0024] 3. The mounting bracket of the present invention utilizes an integral molding process with a female mold during the molding process, which improves the overall quality of the component and solves the problems of welding deformation and cracking of metal structures. At the same time, through the design of the female mold structure, the mounting bracket can meet the matching requirements with other parts of the vehicle body after molding, thus solving the problem of difficulties in the irregular forming of metal structures. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention. Figure 2 ;

[0028] Figure 3 This is a front view of the overall structure of Embodiment 1 of the present invention;

[0029] Figure 4 This is a schematic diagram of the composite material plate support frame arranged inside the shell structure in Embodiment 1 of the present invention;

[0030] Figure 5 This is a schematic diagram of the composite material plate support frame structure of Embodiment 1 of the present invention;

[0031] Among them, 1. Top shell wall, 2. Bottom shell wall, 3. Windward side shell wall, 4. Clearance area, 5. Mounting hole, 6. Fixing hole, 7. Air outlet, 8. Guide pipe, 9. Binding hole, 10. Clearance hole, 11. Core, 12. Connection hole. Detailed Implementation

[0032] Example 1

[0033] This embodiment provides a mounting bracket for rail transit vehicles, such as... Figures 1-3As shown, an integral shell structure made of fiber-reinforced composite material is adopted. The shell structure is open at both ends, so the shell structure includes a top shell wall 1, a bottom shell wall 2, and two side shell walls.

[0034] The top shell wall 1 serves as the vehicle body connecting wall, used to fix it to the bottom of the vehicle body. The bottom shell wall 2 serves as the equipment bearing wall, used to fix the antenna components. The two side shell walls face the direction of the wind and serve as the windward side shell walls 3.

[0035] To match the vehicle body, the top shell wall 1 has a recessed portion forming a clearance area 4 to avoid the bottom of the vehicle body. In the entire shell structure, along the vertical direction, the size of the open end on one side is larger than the size of the open end on the other side. Therefore, the bottom shell wall 2 includes three parts: the two sides are parallel to the top shell wall 1, and the middle part is an arc-shaped inclined structure used to connect the two sides.

[0036] In the top shell wall 1, multiple mounting holes 5 are provided on both sides of the recessed part, and the entire mounting bracket can be fixed to the bottom of the vehicle body through the mounting holes 5.

[0037] The bottom shell wall 2 has fixing holes 6 at both ends for fixing the antenna components. The bottom shell wall 2 also has drainage holes for drainage.

[0038] Multiple air passages 7 are provided on both windward side shell walls 3. Preferably, four air passages 7 are provided. Considering the wind resistance effect, a guide pipe 8 is provided between the corresponding air passages 7. The guide pipe 8 is a flange pipe. The guide pipe 8 is fixed to the windward side shell wall 3 by the flanges at both ends and multiple rivets. At the same time, the two ends of the guide pipe 8 are bonded to the windward side shell wall 3 with adhesive to ensure the high strength of the guide pipe 8.

[0039] Multiple wire-binding holes 9 are provided on the windward side shell wall 3 of the aforementioned side for binding and fixing the antenna.

[0040] The top shell wall 1 is provided with a clearance hole 10 for avoiding the bottom structure of the vehicle body. In this embodiment, two clearance holes 10 are provided at both ends of the recessed part of the top shell wall 1.

[0041] In this embodiment, the top shell wall 1, the bottom shell wall 2, and the two windward side shell walls 3 are integrally formed and are all made of fiber-reinforced composite materials. In order to meet the modal matching with the vehicle body and avoid resonance, a variable stiffness design is adopted, that is, the ply thickness of the top shell wall 1 is greater than the ply thickness of the bottom shell wall 2, and the ply thickness of the bottom shell wall 2 is greater than the ply thickness of the two windward side shell walls 3.

[0042] Specifically, the ply thickness of the top shell wall 1 is 4.5mm-5.5mm, preferably 5mm; the ply thickness of the bottom shell wall 2 is 3.5mm-4.5mm, preferably 4mm; and the ply thickness of the two windward side shell walls 3 is 2.5mm-3.5mm, preferably 3mm.

[0043] The top shell wall 1 and the bottom shell wall 2 are squeezed into two windward side shell walls 3. The two outermost layers of fiber-reinforced fabric are glass fiber, and the remaining layers of fiber-reinforced fabric are carbon fiber.

[0044] The shell structure has antenna mounting areas at both ends, and a core 11 is provided inside the shell wall corresponding to the middle of the antenna mounting area to reinforce the structure.

[0045] The core 11 is located inside the shell wall. Each of the four shell walls has a core 11 in the middle area of ​​the antenna mounting area, so that the four shell walls form a ring-shaped protrusion structure in the middle of the antenna mounting area.

[0046] The core 11 is made of PET foam. By setting the core, the rigidity of the entire mounting bracket is improved, the modality is improved, the matching degree with the vehicle body modality is increased, and resonance is avoided.

[0047] like Figures 4-5 As shown, a composite material plate support frame 13 is also provided on the side of the central region of the four side shell walls. The composite material plate support frame 13 is made of carbon fiber composite material and includes a plate body and flanges provided on the four edges of the plate body.

[0048] The composite material plate support frame 13 is used for structural reinforcement, increasing the structural strength of the entire mounting bracket. The thickness of the composite material plate support frame 13 is 2.5mm-3.5mm, preferably 3mm. Two weight-reducing holes are provided on the plate to reduce the weight of the composite material plate support frame.

[0049] The flange of the composite material plate support frame 13 is fixedly connected to the shell wall by rivets and connecting holes 12 provided on the shell wall, and the composite material plate is bonded and fixed to the shell wall by adhesive.

[0050] The rail transit vehicle mounting bracket in this embodiment adopts an integrated shell structure made of fiber-reinforced composite material instead of a welded metal structure. This avoids the welding points of the metal frame structure, thereby further avoiding vibration cracking of the metal structure. It has good reliability and is lightweight and easy to install because it is made of fiber-reinforced composite material.

[0051] Example 2

[0052] This embodiment provides a method for molding and manufacturing the rail transit mounting bracket described in Embodiment 1, including the following steps:

[0053] Step 1: Lay out a fiber fabric of a predetermined thickness on the negative mold according to the pre-determined layup design requirements. Preferably, the predetermined thickness is half of the total layup thickness. The total layup thickness is determined according to the layup design requirements.

[0054] The shape of the female mold matches the shape of the entire rail transit vehicle mounting bracket.

[0055] Step 2: After the fiber fabric is laid out, resin material is injected using the vacuum infusion method. Existing methods can be used for vacuum infusion, and the specific steps are not described in detail here.

[0056] Step 3: After the resin material has cured, the surface of the cured resin material is polished to achieve a smooth surface, and then the core 11 is laid in the middle of the antenna installation area.

[0057] Step 4: Continue to lay the other half of the fiber fabric according to the pre-determined layering design requirements. After the laying is completed, the resin material is injected a second time until the required thickness is reached. After the resin material injected a second time has cured, the core 11 is located inside the shell wall, forming a sandwich structure, which forms a semi-finished product of the rail transit vehicle mounting bracket.

[0058] Step 5: Using existing mechanical drilling methods, machine the target holes on the semi-finished mounting bracket, including air vent 7, clearance opening 10, mounting hole 5, fixing hole 6, connecting hole 12, binding hole 9, drainage hole, etc.

[0059] Step 6: After the opening is completed, install the composite material plate support frame in the middle area of ​​the shell. Fix the composite material plate support frame through the connecting holes and rivets, and use adhesive to fix the composite material plate support frame to the shell wall. Then install the guide pipe 8 between the corresponding air outlets 7. The guide pipe 8 is fixed to the shell wall through the flange at the end and the rivets. At the same time, the flange at the end of the guide pipe is bonded to the shell wall with adhesive.

[0060] Step 7: After step 6 is completed, the formed product is sprayed with paint. After the paint is applied, the entire rail transit vehicle mounting bracket is manufactured.

[0061] The processing method of this embodiment utilizes an integral molding process with a female mold, which improves the overall quality of the component and solves the problems of welding deformation and cracking in metal structures. At the same time, through the design of the female mold structure, the mounting bracket can meet the matching requirements with other parts of the vehicle body after molding, thus solving the problem of difficulties in the irregular forming of metal structures.

[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A rail transit vehicle mounting bracket, characterized in that, The structure is a one-piece shell made of fiber-reinforced composite material, with open ends. The top shell wall is used to connect with the vehicle body as a vehicle body connection wall, and the bottom shell wall is used to connect with the antenna components as an equipment mounting wall. The ply thickness of the top shell wall is greater than that of the bottom shell wall, and the ply thickness of the bottom shell wall is greater than that of the other two windward shell walls. The antenna mounting areas at both ends of the shell structure are equipped with cores, and the two windward shell walls are equipped with air vents, with guide pipes installed between the corresponding air vents.

2. The rail transit vehicle mounting bracket of claim 1, wherein, In each shell wall of the rail transit vehicle mounting bracket, the two outermost layers are made of glass fiber, while the remaining layers are made of carbon fiber.

3. The rail transit vehicle mounting bracket as described in claim 1, characterized in that, The ply thickness of the top shell wall is 4.5mm-5.5mm, the ply thickness of the bottom shell wall is 3.5mm-4.5mm, and the ply thickness of the two side shell walls is 2.5mm-3.5mm.

4. A rail transit vehicle mounting bracket as described in claim 3, characterized in that, The top shell wall has a ply thickness of 5 mm, the bottom shell wall has a ply thickness of 4 mm, and the two side shell walls have a ply thickness of 3 mm.

5. A rail transit vehicle mounting bracket as described in claim 1, characterized in that, The guide tube is fixedly connected to the side shell wall by rivets, and the guide tube is bonded to the side shell wall by adhesive.

6. A rail transit vehicle mounting bracket as described in claim 1, characterized in that, The windward side shell of the rail transit vehicle mounting bracket is provided with a binding hole.

7. A rail transit vehicle mounting bracket as described in claim 1, characterized in that, The top shell of the rail transit vehicle mounting bracket is provided with a clearance hole to avoid the bottom structure of the vehicle body.

8. A rail transit vehicle mounting bracket as described in claim 1, characterized in that, A composite material plate support frame is fixed to the inner surface of the central area of ​​the shell structure. The composite material plate support frame is fixed to the inner surface of the shell wall by rivets and bonded by adhesive.

9. A rail transit vehicle mounting bracket as described in claim 1, characterized in that, The sandwich core is made of PET foam.

10. A method for molding and preparing a rail transit vehicle mounting bracket according to any one of claims 1-9, characterized in that, Includes the following steps: A fiber fabric of a predetermined thickness is laid in the negative mold according to the pre-determined layup design requirements, and then injection is performed after the fiber fabric is laid. After the injected resin has cured, the sandwich material is laid on top. Continue laying the fiber fabric according to the predetermined layup design requirements until the target thickness required by the layup design is achieved, and then perform a second infusion. After the resin material injected in the second stage cures, it forms a semi-finished mounting bracket. The target holes are machined into the semi-finished frame of the mounting bracket, and the guide pipe is fixed between the two corresponding air inlets.

11. The method for molding and preparing a rail transit vehicle mounting bracket as described in claim 10, characterized in that, Before laying the core material, the cured resin material is sanded.

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