Rail transit composite lightweight sound insulation end wall structure

Abstract

This invention discloses a lightweight soundproof end wall structure made of composite materials for rail transit, which consists of a front supporting body and a rear soundproof body. The soundproof body has a sound-absorbing and vibration-damping main structure. The supporting body includes a steel frame for providing mechanical support for the end wall and decorative layers covering the front side and left and right sides of the steel frame. The steel frame has a frame cavity for sound insulation and weight reduction. The steel frame consists of a one-piece molded front panel, left panel, right panel, and rear panel. The rear panel includes: a left rear fold panel formed by folding the rear end of the left panel to the right; a left rear back fold panel formed by folding the left rear fold panel forward; and a left rear overlapping panel formed by folding the left rear back fold panel to the right. Similarly, the right rear fold panel forms a right rear fold panel formed by folding the rear end of the right panel to the left; a right rear back fold panel formed by folding the right rear fold panel forward; and a right rear overlapping panel formed by folding the right rear back fold panel to the left. The left and right rear fold panels support the left and right sides of the sound insulation body, respectively. Support members for the central area of ​​the sound insulation body are installed on the left and right rear overlapping panels. Its advantage lies in achieving lightweight construction of the end wall while meeting the structural strength requirements and sound insulation effect of the end wall.

Description

Technical Field

[0001] This invention relates to a lightweight soundproof end wall structure made of composite materials for rail transit, belonging to the field of wall soundproofing technology. Background Technology

[0002] The soundproof end wall is the partition wall between the front driver's cab and the rear passenger compartment in the front carriage of a train. Its basic requirements are that it has the necessary mechanical strength and the ability to insulate sound so that the driver's cab and the passenger compartment do not interfere with each other.

[0003] Driven by the development of the rail transit industry both domestically and internationally, lightweighting of rail transit has received increasing attention and importance. Lightweighting of interior components in rail transit vehicles is crucial for reducing vehicle weight and noise, increasing speed, and lowering energy consumption. While ensuring the overall strength of the vehicle, interior components have become a key area for lightweighting. Currently, weight reduction in interior components is mainly achieved by selecting lightweight raw materials and using appropriate molding processes and manufacturing methods to produce lightweight, high-strength interior products that meet performance requirements. The end walls used on rail transit vehicles not only require aesthetic appeal but also increasingly higher demands for lightweight design and sound insulation performance.

[0004] Currently, the end walls of rail transit vehicles mainly use sandwich structures made of aluminum honeycomb, fiberglass, and carbon fiber. Aluminum honeycomb panels are suitable for simple shapes without complex curved surfaces, but their manufacturing process requires a large amount of profiles and aluminum frames, resulting in significant weight and failing to meet lightweight requirements. Fiberglass sandwich panels typically use fiberglass as the skin and PET foam as the core material, formed using vacuum injection molding. Their advantages include relatively simple molding processes and good shaping capabilities, but they suffer from relatively poor dimensional stability, low stiffness, easy deformation, and significant weight. Furthermore, their fire resistance no longer meets the requirements of current vehicles. Carbon fiber sandwich panels use the same process as fiberglass sandwich panels and possess high strength and resistance to deformation, but their high cost makes them unsuitable for mass production. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to achieve lightweighting of the end wall while ensuring its sound insulation effect and mechanical strength.

[0006] To address the above problems, the technical solution proposed by this invention is as follows:

[0007] A lightweight soundproof end wall structure made of composite materials for rail transit comprises a front supporting body and a rear soundproof body. The soundproof body has a main structure for sound absorption and vibration reduction. The supporting body includes a steel frame for providing mechanical support to the end wall and decorative layers covering the front and left and right sides of the steel frame. The steel frame has a frame cavity for sound insulation and weight reduction. The steel frame is composed of an integrally formed front panel, left panel, right panel, and rear panel. The rear panel includes: a left rear fold panel formed by folding the rear end of the left panel to the right, a left rear back fold panel formed by folding the left rear fold panel forward, and a left rear overlapping panel formed by folding the left rear back fold panel to the right; and a right rear fold panel formed by folding the rear end of the right panel to the left, a right rear back fold panel formed by folding the right rear fold panel forward, and a right rear overlapping panel formed by folding the right rear back fold panel to the left. The rear folding panel and the right rear folding panel are used to support the left and right sides of the sound insulation body, respectively. Support members are provided on the left and right rear overlapping panels to support the middle area of ​​the sound insulation body. The right end of the left rear overlapping panel and the left end of the right rear overlapping panel are folded backward to form a left support side panel and a right support side panel that abut against the middle area of ​​the sound insulation body. The support body also includes an A-frame. The left and right sides of the A-frame have a left inclined support plate and a right inclined support plate, respectively. The left end of the left inclined support plate is fixed to the front end of the left panel, and the right end of the left inclined support plate abuts against the front end of the left support side panel. The right end of the right inclined support plate is fixed to the front end of the right panel, and the left end of the right inclined support plate abuts against the front end of the right support side panel. A limiting plate is provided at the bottom of the A-frame. The left and right sides of the limiting plate are engaged between the left and right support side panels.

[0008] A layer of sound-absorbing cotton is filled between the left rear fold-back panel and the left support side panel, between the left support side panel and the right support side panel, and between the right support side panel and the right rear fold-back panel.

[0009] Two layers of sound-absorbing cotton are attached to the front side of the frame cavity.

[0010] The sound insulation body includes an epoxy panel two that is pressed onto the left rear folding panel and the right rear folding panel, a sound insulation sheet one that is pressed onto the rear side of the epoxy panel two, a phenolic foam block two that is pressed onto the back of the sound insulation sheet one, a sound insulation sheet two that is pressed onto the back of the phenolic foam block two, and an epoxy panel three that is pressed onto the back of the sound insulation sheet two. Beneficial effects

[0011] 1. While meeting the structural strength requirements and sound insulation effect of the end wall, the lightweighting of the end wall structure was achieved;

[0012] 2. By setting up the A-frame, the structural strength of the steel frame is significantly enhanced, while still meeting the requirements for lightweighting;

[0013] 3. The main body of the steel frame is formed by bending and stamping in one piece. The A-frame can be directly inserted into the frame cavity of the steel frame and then fixed with screws. The manufacturing and assembly are also very simple. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the horizontal cross-section of the end wall described in Embodiment 1;

[0015] Figure 2 This is a schematic diagram of the horizontal cross-section of the steel frame described in Embodiment 2;

[0016] Figure 3 This is a schematic diagram of the horizontal cross-section of the end wall described in Embodiment 2;

[0017] Figure 4 This is a top view of the A-frame described in Embodiment 3;

[0018] Figure 5 This is a schematic cross-sectional view of the steel frame and A-frame assembled as described in Example 3;

[0019] Figure 6 This is a schematic diagram of the horizontal cross-section of the end wall described in Embodiment 3.

[0020] In the diagram: 1. Supporting main body; 11. Steel frame; 111. Left side panel; 1111. Left rear fold panel; 1112. Left rear back fold panel; 1113. Left rear overlapping panel; 1114. Left supporting side panel; 112. Right side panel; 1121. Right rear fold panel; 1122. Right rear back fold panel; 1123. Right rear overlapping panel; 1124. Right supporting side panel; 113. Front panel; 114. 1. Frame cavity; 12. A-frame; 121. Left inclined support plate; 122. Right inclined support plate; 123. Limiting plate; 13. Countersunk screw; 14. Decorative layer; 15. Epoxy panel one; 16. Phenolic foam block one; 17. Sound-absorbing cotton layer one; 18. Sound-absorbing cotton layer two; 2. Sound insulation body; 21. Epoxy panel two; 22. Sound insulation sheet one; 23. Phenolic foam block two; 24. Sound insulation sheet two; 25. Epoxy panel three. Detailed Implementation

[0021] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1

[0022] like Figure 1As shown, a lightweight soundproof end wall structure made of composite materials for rail transit consists of a front supporting body 1 and a rear soundproof body 2. The soundproof body 2 has a sound-absorbing and vibration-damping main structure to ensure the overall soundproofing effect of the end wall. The supporting body 1 includes a steel frame 11 for providing mechanical support for the end wall and decorative layers 14 covering the front and left and right sides of the steel frame 11. The steel frame 11 has a frame cavity 114 for sound insulation and weight reduction. In this way, while meeting the mechanical strength requirements and ensuring the soundproofing effect of the end wall, the weight of the end wall is reduced by setting the frame cavity 114, which also saves materials and reduces manufacturing costs.

[0023] As described above, decorative layer 14 is merely a decorative skin.

[0024] The steel frame 11 is composed of an integrally formed front panel 113, left panel 111, right panel 112 and rear panel. The rear panel includes: a left rear fold panel 1111 formed by folding the rear end of the left panel 111 to the right, a left rear back fold panel 1112 formed by folding the left rear fold panel 1111 forward, a left rear overlapping panel 1113 formed by folding the left rear back fold panel 1112 to the right, and a right rear fold panel 1121 formed by folding the rear end of the right panel 112 to the left, a right rear back fold panel 1122 formed by folding the right rear back fold panel 1121 forward, and a right rear overlapping panel 1123 formed by folding the right rear back fold panel 1122 to the left. The left rear fold panel 1111 and the right rear fold panel 1121 are used to support the left and right sides of the sound insulation body 2, respectively. Support members for supporting the middle area of ​​the sound insulation body 2 are provided on the left rear overlapping panel 1113 and the right rear overlapping panel 1123. In this way, the steel frame 11 is a lightweight hollow structure that can ensure the mechanical strength of both sides of the end wall as well as the mechanical strength of the middle area of ​​the end wall.

[0025] Epoxy panels 15 are attached to the left rear overlapping panel 1113 and the right rear overlapping panel 1123. A phenolic foam block 16 with vibration damping and sound absorption function is placed between the center of the epoxy panel 15 and the sound insulation body 2, serving as a load-bearing support for the center of the sound insulation body 2. Sound-absorbing cotton layers 17 are filled between the epoxy panels 15 and the sound insulation body on both sides of the phenolic foam block 16. The phenolic foam block has a certain strength, and its placement in the middle can meet appropriate load-bearing requirements.

[0026] The sound insulation body 2 includes an epoxy panel 21 pressed onto the left rear folding panel 1111 and the right rear folding panel 1121, a sound insulation sheet 22 pressed onto the rear side of the epoxy panel 21, a phenolic foam block 23 pressed onto the back of the sound insulation sheet 22, a sound insulation sheet 24 pressed onto the back of the phenolic foam block 23, and an epoxy panel 25 pressed onto the back of the sound insulation sheet 24. The sound insulation sheets 22 and 24 provide two levels of sound insulation for the end wall; the phenolic foam block 23 provides overall vibration reduction and noise reduction for the end wall, and possesses the required mechanical strength, thereby ensuring basic structural strength and further achieving sound insulation effects.

[0027] A layer of sound-absorbing cotton 18 is attached to the front side of the cavity 114 of the frame to achieve overall sound absorption of the end wall.

[0028] The epoxy panel 325 is also the decorative panel on the rear side of the sound insulation body 2. Example 2

[0029] like Figure 2 , 3 As shown, the difference from Embodiment 1 is that the right end of the left rear overlapping panel 1113 and the left end of the right rear overlapping panel 1123 are folded backward to form a left support side panel 1114 and a right support side panel 1124 that abut against the middle region of the sound insulation body 2. Sound-absorbing cotton layer 17 is filled between the left rear folded panel 1112 and the left support side panel 1114, between the left support side panel 1114 and the right support side panel 1124, and between the right support side panel 1124 and the right rear folded panel 1122. In this way, the rear ends of the left support side panel 1114 and the right support side panel 1124 directly support the middle region of the sound insulation body 2, and the sound-absorbing cotton layer 17 further enhances the sound absorption effect of the end wall. Example 3

[0030] like Figure 4As shown in Figure 6, this embodiment is a further optimization of Embodiment 2, in that: the supporting body 1 also includes an A-frame 12, with a left inclined support plate 121 on the left side and a right inclined support plate 122 on the right side. The left end of the left inclined support plate 121 is fixed to the front end of the left side panel 111, and the right end of the left inclined support plate 121 abuts against the front end of the left side support panel 1114. The right end of the right inclined support plate 122 is fixed to the front end of the right side panel 112, and the left end of the right inclined support plate 122 abuts against the front end of the right side support panel 1124. A limiting plate 123 is provided at the bottom of the A-frame 12, and the left and right sides of the limiting plate 123 are engaged between the left side support panel 1114 and the right side support panel 1124. The A-frame 12 can be made of lightweight alloy material. This significantly strengthens the structural strength of the steel frame 11. The limiting plate 123 connects the left inclined support plate 121 and the right inclined support plate 122, and also secures the A-frame 12 in the simplest way. Conversely, the A-frame 12 prevents the rear panel of the steel frame 11 from tilting left or right. Assembly of the A-frame 12 with the main body of the steel frame 11 is also simple: insert the A-frame 12 into the frame cavity 114 from one end of the steel frame 11, and then use countersunk screws 13 to fix the bottom end of the left inclined support plate 121 to the front end of the left panel 111, and the bottom end of the right inclined support plate 122 to the front end of the right panel 112.

[0031] The above embodiments are only used to describe the present invention more clearly, and should not be regarded as limiting the scope of protection covered by the present invention. Any equivalent modifications should be regarded as falling within the scope of protection covered by the present invention.

Claims

1. A lightweight sound-insulating end wall structure made of composite materials for rail transit, characterized in that: It consists of a front supporting body (1) and a rear sound insulation body (2). The sound insulation body (2) has a sound-absorbing and vibration-damping main structure. The supporting body (1) includes a steel frame (11) for providing mechanical support for the end wall and decorative layers (14) covering the front and left and right sides of the steel frame (11). The steel frame (11) has a frame cavity (114) for sound insulation and weight reduction. The steel frame (11) is composed of an integrally formed front panel (113), a left panel (111), a right panel (112), and a rear panel. The rear panel includes: a left panel (111). The left rear panel (1111) formed by folding the rear end to the right, the left rear panel (1111) formed by folding the left rear panel (1111) forward and back to form the left rear back panel (1112), the left rear overlapping panel (1112) formed by folding the left rear panel (1112) to the right and the right rear panel (1122) formed by folding the rear end of the right panel (112) to the left and back to form the right rear overlapping panel (1123), the left rear panel (1111) and the right rear panel (1121). Support members are provided on the left and right sides of the sound insulation body (2) to support the middle area of ​​the sound insulation body (2), respectively, on the left rear overlapping panel (1113) and the right rear overlapping panel (1123); the right end of the left rear overlapping panel (1113) and the left end of the right rear overlapping panel (1123) are respectively folded backward to form a left support side panel (1114) and a right support side panel (1124) that abut against the middle area of ​​the sound insulation body (2); the support body (1) also includes an A-frame (12), the left side and the right side of the A-frame (12) respectively have a left inclined support plate (121) and a right inclined support plate (121). The support plate (122) has its left end fixed to the front end of the left side panel (111), and its right end abutting against the front end of the left side panel (1114). The right end of the right side support plate (122) is fixed to the front end of the right side panel (112), and its left end abutting against the front end of the right side panel (1124). The bottom end of the A-frame (12) is provided with a limiting plate (123), and the left and right sides of the limiting plate (123) are engaged between the left side panel (1114) and the right side panel (1124).

2. The lightweight sound-insulating end wall structure of composite materials for rail transit according to claim 1, characterized in that: A layer of sound-absorbing cotton (17) is filled between the left rear fold panel (1112) and the left support side panel (1114), between the left support side panel (1114) and the right support side panel (1124), and between the right support side panel (1124) and the right rear fold panel (1122).

3. The lightweight sound-insulating end wall structure of composite materials for rail transit according to claim 1, characterized in that: A second layer of sound-absorbing cotton (18) is attached to the front side of the frame cavity (114).

4. The lightweight sound-insulating end wall structure of composite materials for rail transit according to claim 1, characterized in that: The sound insulation body (2) includes an epoxy panel two (21) pressed on the left rear folding panel (1111) and the right rear folding panel (1121), a sound insulation sheet one (22) pressed on the rear side of the epoxy panel two (21), a phenolic foam block two (23) pressed on the back of the sound insulation sheet one (22), a sound insulation sheet two (24) pressed on the back of the phenolic foam block two (23), and an epoxy panel three (25) pressed on the back of the sound insulation sheet two (24).

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