Noise-reducing acoustically insulating floor panel

Abstract

The application discloses a noise reduction and sound insulation large base plate, which comprises a lower plate, an upper plate laid on the lower plate and a sound absorption layer sandwiched between the lower plate and the upper plate, wherein the lower plate and the upper plate are both foam sandwich plates, the upper surface of the lower plate is provided with upward protruding ribs, the edges of the upper plate are provided with 90-degree downward folded edges, the lower surface of the upper plate and the folded edges are respectively bonded with the ribs, a cavity is formed between the upper plate and the lower plate, and the sound absorption layer is filled in the cavity. The application guarantees the reliability of noise reduction and sound insulation, the combination of the foam sandwich plate and the sound absorption layer effectively increases the thickness and reduces the density and weight, the cooperation of the ribs of the lower plate and the folded edges of the upper plate effectively improves the overall bending stiffness, effectively avoids the vibration and sag of the large base plate during the running process, forms the large base plate with high stiffness, low density, large thickness, light weight and high sound insulation, and meets the use requirement of the large base plate of the straddle-type monorail vehicle.

Description

Technical Field

[0001] This invention relates to a noise reduction and sound insulation base plate, belonging to the field of noise reduction and sound insulation pad technology. Background Technology

[0002] Straddle-type monorail transit is a type of urban rail transit system, a medium-capacity rail transit system suitable for urban above-ground spaces. It uses a single track to support, stabilize, and guide the vehicle, which uses rubber tires straddling the track beams. The area around the driver's cab of the straddle-type monorail vehicle is a noise source, including aerodynamic noise, tire noise, and impact vibration noise. During operation, the noise level near the driver's cab is relatively high. The large floor panel in front of the driver's cab needs noise reduction capabilities to block noise from the underframe. Currently used straddle-type monorail vehicle floor panels have a "panel + foam core + panel" sandwich structure with a total thickness of approximately 30mm, resulting in a weighted sound insulation of less than 30dB. To further improve sound insulation performance, damping slurry is sprayed onto the bottom surface of the floor panel after installation, sound-absorbing material is filled, and aluminum fiberboard is laid to increase the sound insulation, raising the weighted sound insulation to 35dB. This process is complex, time-consuming, and significantly increases the product weight.

[0003] Vibration and noise reduction control for straddle-type monorail vehicles mainly focuses on two aspects: noise sources and transmission paths. Noise reduction measures primarily rely on improving the sound insulation characteristics of the car body structure to reduce the energy of mid-to-high frequency noise inside the passenger compartment. However, as the requirements for train acoustic performance and car body lightweighting become increasingly stringent, increasing weight to improve structural sound insulation is clearly not in line with the overall requirements of train research and development, especially in the noise source area, namely the driver's cab area. Summary of the Invention

[0004] The noise reduction and sound insulation base plate provided by this invention ensures the reliability of noise reduction and sound insulation. The combination of foam sandwich panel and sound-absorbing layer effectively increases the thickness and reduces density and weight. The cooperation between the convex ribs of the lower plate and the flange of the upper plate effectively improves the overall bending stiffness and effectively avoids the vibration and sagging of the base plate during vehicle loading and operation. It forms a base plate with high stiffness, low density, large thickness, light weight and higher weighted sound insulation, which meets the usage requirements of the base plate of straddle-type monorail vehicles.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] The noise reduction and sound insulation base plate includes a lower plate, an upper plate laid on the lower plate, and a sound-absorbing layer sandwiched between the lower plate and the upper plate. Both the lower plate and the upper plate are foam sandwich panels. The lower plate has an upwardly protruding rib on its upper surface and a downwardly folded 90-degree flange on its edge. The lower surface of the upper plate and the flange are respectively bonded to the rib, forming a cavity between the upper plate and the lower plate. The sound-absorbing layer fills the cavity.

[0007] Preferably, the raised ribs are provided on the edge and upper surface of the lower plate, and the raised ribs are distributed in a crisscross pattern on the upper surface of the lower plate, with the sound-absorbing layer laid on the upper surface of the lower plate.

[0008] Preferably, the thickness of the lower plate is 5-7 mm, and the thickness of the upper plate is three to four times that of the lower plate. Both the upper and lower plates include a resin-based fiber-reinforced composite panel and a foam core layer sandwiched between the two panels. The density of the panel is 1500-2100 kg / m³, and the thickness is 0.5-1.5 mm. The density of the foam core layer is 70-300 kg / m³.

[0009] Preferably, the raised rib and the lower plate are integrally formed, the raised rib on the edge of the lower plate is bonded to the flange with structural adhesive, the raised rib on the upper surface of the lower plate is bonded to the lower surface of the upper plate with structural adhesive, and the width of the raised rib is 20-40mm and the height is 30-35mm.

[0010] Preferably, the flange is composed of a panel flange formed by folding the panel of the upper plate downward and a whole plate flange formed by folding the entire upper plate downward. The panel flange is set along the width edge of the upper plate, and the whole plate flange is set along the length edge of the upper plate. The panel flange and the whole plate flange are integrally formed, and the flange is flush with the lower surface of the lower plate.

[0011] Preferably, the sound-absorbing layer includes a sound-insulating pad bonded to the upper surface of the lower plate and sound-absorbing cotton pressed between the sound-insulating pad and the lower surface of the upper plate. The thickness of the sound-insulating pad is 1.0-2.0 mm. The upper surface of the sound-insulating pad is covered with an aluminum skin, and the sound-absorbing cotton is laid on the aluminum skin.

[0012] Preferably, mounting holes are formed on the protruding ribs at the edge of the lower plate, and the mounting holes extend upward through the upper plate. Both the upper and lower plates have mounting hole reinforcing blocks with a strength greater than that of the foam core layer in the foam core layer at the location of the mounting hole. The mounting hole reinforcing blocks are sandwiched between the two panels, and the mounting holes are formed on the mounting hole reinforcing blocks.

[0013] Preferably, the mounting hole reinforcing block is an aluminum block or a fiber-reinforced resin foam block with a density of 500-800 kg / m³.

[0014] Preferably, a blind hole reinforcing block is provided in the lower plate, and a sealing cap aligned with the blind hole reinforcing block is provided in the sound-absorbing layer. The blind hole reinforcing block is integrally formed with the panel of the lower plate, and the sealing cap abuts against the blind hole reinforcing block. A blind hole extending upward from the blind hole reinforcing block to the sealing cap is formed.

[0015] Preferably, a nut is pre-embedded between the blind hole reinforcement block and the sealing cap, the inner hole of the nut is aligned with the blind hole, the sealing cap is made of foam material with a density of 70-300 kg / m³, a resin-based fiber-reinforced composite panel is bonded to the surface of the sealing cap, and it is bonded to the lower surface of the upper plate with structural adhesive.

[0016] The beneficial effects of the invention are:

[0017] In this invention, both the lower and upper panels of the noise reduction and sound insulation base plate are made of foam sandwich panels, which can form an attenuation process of sound wave blocking, reflection, absorption, and re-blocking. The sound-absorbing layer blocks and absorbs sound waves, forming a multi-layered shielding attenuation of sound waves, improving the weighted sound insulation, and ensuring the reliability of noise reduction and sound insulation. The combination of foam sandwich panels and sound-absorbing layers effectively increases the thickness while reducing density and weight. The cooperation between the convex ribs of the lower panel and the flanges of the upper panel effectively improves the overall bending stiffness, effectively preventing the base plate from vibrating and sagging during vehicle operation. This results in a base plate with high stiffness, low density, large thickness, light weight, and higher weighted sound insulation, meeting the usage requirements of the base plate for straddle-type monorail vehicles.

[0018] Mounting holes are made on the base plate, and the mounting holes are made on the mounting hole reinforcement blocks. That is, reinforcement is made around the mounting holes. The reinforcement blocks are aluminum blocks or fiber-reinforced resin foam material with a density of 500-800 kg / m³, which effectively improves the local compressive strength of the mounting holes. The base plate is mechanically connected to the side wall of the vehicle body through the mounting holes, which effectively improves the connection strength and avoids collapse and deformation at the connection.

[0019] A blind hole reinforcement block is installed in the lower plate, and a sealing cap aligned with the blind hole reinforcement block is installed in the sound-absorbing layer. The blind hole extends upward from the blind hole reinforcement block to the sealing cap. A nut is pre-embedded between the blind hole reinforcement block and the sealing cap. The blind hole reinforcement block reinforces the outer periphery of the nut to effectively fix the nut. The sealing cap separates the interior of the large bottom plate from the blind hole to prevent moisture from entering the interior of the large bottom plate along the blind hole. The large bottom plate is connected to the vehicle chassis or light equipment through the blind hole to ensure connection strength and improve connection reliability. Attached Figure Description

[0020] Figure 1 This is a partial cross-sectional view of the noise reduction and sound insulation base plate in a specific implementation.

[0021] Figure 2 This is a schematic diagram of the lower plate.

[0022] Figure 3 This is a schematic diagram of the upper plate.

[0023] Figure 4 This is a schematic diagram showing the bottom of the noise reduction and sound insulation base plate facing upwards.

[0024] Figure 5 This is a magnified sectional view of the bonding between the raised ribs and the overall flange in the noise reduction and sound insulation base plate.

[0025] Figure 6 This is a magnified sectional view showing the bonding of the raised ribs to the flange of the panel in the noise reduction and sound insulation base plate.

[0026] Figure 7This is a magnified sectional view showing the bonding of the raised ribs in the noise reduction and sound insulation base plate to the lower surface of the upper plate.

[0027] Figure 8 This is a partially enlarged sectional view of the mounting hole locations in the noise reduction and sound insulation base plate.

[0028] Figure 9 This is a magnified sectional view of the location of blind holes in the noise reduction and sound insulation base plate. Detailed Implementation

[0029] The following is combined Figures 1-9 The embodiments of the present invention will be described in detail below.

[0030] The noise reduction and sound insulation base plate includes a lower plate 1, an upper plate 2 laid on the lower plate 1, and a sound-absorbing layer 3 sandwiched between the lower plate 1 and the upper plate 2. Both the lower plate 1 and the upper plate 2 are foam sandwich panels. The lower plate 1 has an upwardly protruding rib 11 on its upper surface, and the upper plate 2 has a downwardly folded flange 21 on its edge. The lower surface of the upper plate 2 and the flange 21 are respectively bonded to the rib 11, forming a cavity between the upper plate 2 and the lower plate 1. The sound-absorbing layer 3 fills the cavity.

[0031] The lower plate 1 and upper plate 2 of the noise reduction and sound insulation base plate described above are both foam sandwich panels, which can form an attenuation process of sound wave blocking, reflection, absorption and then blocking again. The sound-absorbing layer 3 blocks and absorbs sound waves, forming a multi-layer shielding attenuation of sound waves, improving the weighted sound insulation, and ensuring the reliability of noise reduction and sound insulation. The combination of foam sandwich panels and sound-absorbing layers effectively increases the thickness and reduces the density and weight. The cooperation between the ribs 11 of the lower plate 1 and the flanges 21 of the upper plate 2 effectively improves the overall bending stiffness, effectively preventing the base plate from vibrating and sagging during vehicle operation, forming a base plate with high stiffness, low density, large thickness, light weight and higher weighted sound insulation, meeting the usage requirements of the base plate of straddle-type monorail vehicles.

[0032] The raised ribs 11 are provided on the edge and upper surface of the lower plate 1, and are distributed crisscrossingly on the upper surface of the lower plate. The sound-absorbing layer 3 is laid on the upper surface of the lower plate 1. The raised ribs 11 on both the edge and lower surface of the lower plate 1 effectively improve the strength of the lower plate. During molding, the sound-absorbing layer 3 is first laid on the upper surface of the lower plate 1, then structural adhesive is applied to the top surface and sidewalls of the raised ribs 11, and then the raised ribs 11 are bonded to the lower surface of the upper plate 2 and the flange 21.

[0033] The lower plate has a thickness of 5-7 mm, and the upper plate 2 is three to four times thicker than the lower plate 1. Both the upper plate 2 and the lower plate 1 consist of a resin-based fiber-reinforced composite panel and a foam core layer sandwiched between the two panels. The panel has a density of 1500-2100 kg / m³ and a thickness of 0.5-1.5 mm, while the foam core layer has a density of 70-300 kg / m³. The lower plate is a thin sandwich structure, and the upper plate is a thick sandwich structure. The panel is made of resin-based fiber-reinforced composite material, and the foam core layer is made of low-density foam material, resulting in a large base plate with high thickness, low sealing, and light weight.

[0034] The rib 11 and the lower plate 1 are integrally formed. The rib 11 on the edge of the lower plate 1 is bonded to the flange 21 with structural adhesive. The rib 11 on the upper surface of the lower plate 1 is bonded to the lower surface of the upper plate 2 with structural adhesive. The width of the rib 11 is 20-40mm and the height is 30-35mm. The rib 11 and the lower plate 1 are integrally formed, which is simple to form, structurally stable, and will not detach. The rib 11 on the lower plate 1 improves the overall bending stiffness. The rib 11 is bonded to the lower surface of the upper plate 2 and the flange 21. Placing the rib 11 on the lower surface of the upper plate 2 ensures the overall strength of the base plate.

[0035] The flange 21 is composed of a panel flange 22 formed by folding the panel of the upper plate 2 downwards and a whole-plate flange 23 formed by folding the entire upper plate 2 downwards. The panel flange 22 is set along the width edge of the upper plate, and the whole-plate flange 23 is set along the length edge of the upper plate. The panel flange 22 and the whole-plate flange 23 are integrally formed, and the flange 32 is flush with the lower surface of the lower plate 1. The whole-plate flange 23 is bonded to the rib 11 to further improve the overall bending stiffness of the base plate.

[0036] The sound-absorbing layer 3 includes a sound-insulating pad 31 bonded to the upper surface of the lower plate and a sound-absorbing cotton 32 pressed between the sound-insulating pad 31 and the lower surface of the upper plate. The thickness of the sound-insulating pad 31 is 1.0-2.0mm. The upper surface of the sound-insulating pad 31 is covered with an aluminum skin, and the sound-absorbing cotton 32 is laid on the aluminum skin. On the area without raised ribs 21 on the upper surface of the lower plate, a sound insulation pad 31 is laid, followed by sound-absorbing cotton. The sound insulation pad is made of flame-retardant rubber material, with a total thickness of about 1.5mm and a surface density of about 2.3kg / ㎡. It has damping characteristics, and its fire resistance performance indicators such as smoke density and smoke toxicity meet the requirements of EN45545-2 rail transit fire protection standard R23 HL2 level. The lower plate is attached to the lower surface of the sound insulation pad 31, and the upper surface is covered with a layer of aluminum skin. Sound-absorbing cotton 32 is laid on the aluminum skin. The sound-absorbing cotton 32 is made of glass fiber or carbon fiber filaments, and is in a fluffy state that can be compressed to a certain extent. The density of the sound-absorbing cotton is less than 30kg / m³, the compression rate is more than 30%, the average sound absorption coefficient is more than 0.6, the thermal conductivity is less than 0.04W / (m·K), and the fire resistance performance meets the highest level requirements of EN45545-2 rail transit fire protection standard R1 HL3. The environmental performance meets the relevant rail transit standards.

[0037] In this design, mounting holes 4 are formed on the protruding ribs 11 at the edge of the lower plate 1, extending upwards through the upper plate 2. Both the upper plate 2 and the lower plate 1 have mounting hole reinforcing blocks 5 with a strength greater than that of the foam core layer at the location of the mounting hole. These reinforcing blocks 5 are sandwiched between the two panels, and the mounting holes 4 are formed on the reinforcing blocks 5. The mounting holes 4 are formed on the reinforcing blocks 5, meaning that reinforcement is applied around the mounting holes 4, effectively improving the local compressive strength of the mounting holes 4.

[0038] The mounting hole reinforcing block 5 is an aluminum block or a fiber-reinforced resin foam block with a density of 500-800 kg / m³. This effectively improves the local compressive strength of the mounting hole 4. The large base plate is mechanically connected to the vehicle body side wall through the mounting holes, effectively improving the connection strength and preventing collapse and deformation at the connection point.

[0039] The lower plate 1 is provided with a blind hole reinforcing block 6, and a sealing cap 7 aligned with the reinforcing block 6 is provided in the sound-absorbing layer 3. The blind hole reinforcing block 6 is integrally formed with the panel of the lower plate 1, and the sealing cap 7 abuts against the blind hole reinforcing block 6. A blind hole 8 extends upward from the blind hole reinforcing block 6 to the sealing cap 7. The blind hole 8 separates the interior of the bottom plate from the blind hole 8, preventing moisture from entering the interior of the bottom plate through the blind hole 8. The bottom plate is connected to the vehicle chassis or light equipment through the blind hole.

[0040] In this design, a nut 9 is pre-embedded between the blind hole reinforcing block 6 and the sealing cap 7. The inner hole of the nut 9 is aligned with the blind hole 8. The sealing cap 7 is made of foam material with a density of 70-300 kg / m³. A resin-based fiber-reinforced composite panel is bonded to the surface of the sealing cap 7 and is then bonded to the lower surface of the upper plate 2 with structural adhesive. The nut 9 is pre-embedded between the blind hole reinforcing block 6 and the sealing cap 7, and the blind hole reinforcing block 6 reinforces the outer periphery of the nut 8, effectively fixing the nut 9. The large base plate is connected to the vehicle chassis or light equipment via the nut 9, ensuring connection strength and improving connection reliability.

[0041] The technical solutions of the embodiments of the present invention have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A noise reduction and sound insulation floor panel, comprising a lower panel, an upper panel laid on the lower panel, and a sound absorbing layer sandwiched between the lower panel and the upper panel, the lower panel and the upper panel are both foam sandwich panels, characterized in that: The upper surface of the lower plate has upwardly protruding ribs, the edges of the upper plate have downwardly folded 90-degree flanges, the lower surface of the upper plate and the flanges are bonded to the ribs, respectively, and a cavity is formed between the upper plate and the lower plate, and the sound-absorbing layer is filled in the cavity; The ribs are arranged on the edges and the upper surface of the lower plate, and the ribs are distributed longitudinally and transversely on the upper surface of the lower plate, and the sound-absorbing layer is laid on the upper surface of the lower plate; The thickness of the lower plate is 5-7 mm, and the thickness of the upper plate is three to four times the thickness of the lower plate, and the upper plate and the lower plate each comprise a panel of a resin-based fiber-reinforced composite material and a foam core layer sandwiched between the two panels, the panel has a density of 1500-2100 kg / m³ and a thickness of 0.5-1.5 mm, and the foam core layer has a density of 70-300 kg / m³; The blind hole reinforcing block is arranged in the lower plate, the sealing cap aligned with the blind hole reinforcing block is arranged in the sound-absorbing layer, the blind hole reinforcing block is integrally formed with the panel of the lower plate, the sealing cap abuts against the blind hole reinforcing block, and the blind hole extending from the blind hole reinforcing block to the sealing cap is formed in the blind hole reinforcing block; The blind hole reinforcing block and the sealing cap are pre-buried with a nut, the inner hole of the nut is aligned with the blind hole, the sealing cap is made of a foam material with a density of 70-300 kg / m³, the surface of the sealing cap is bonded with a panel of a resin-based fiber-reinforced composite material, and the lower surface of the upper plate is bonded with the sealing cap through structural glue.

2. The noise reducing acoustical floor panel of claim 1, wherein: The ribs and the lower plate are integrally formed, the ribs on the edges of the lower plate are bonded with the flanges through structural glue, the ribs on the upper surface of the lower plate are bonded with the lower surface of the upper plate through structural glue, the width of the ribs is 20-40 mm, and the height of the ribs is 30-35 mm.

3. The noise reducing acoustical floor underlayment of claim 1, wherein: The flange is composed of a panel flange formed by folding the panel of the upper plate downwardly and an integral flange formed by folding the whole upper plate downwardly, the panel flange is arranged along the width edge of the upper plate, the integral flange is arranged along the length edge of the upper plate, and the panel flange and the integral flange are integrally formed, and the flange is flush with the lower surface of the lower plate.

4. The noise reducing acoustical floor underlayment of claim 1 wherein: The sound-absorbing layer comprises a sound insulation pad bonded to the upper surface of the lower plate and sound-absorbing cotton compressed between the sound insulation pad and the lower surface of the upper plate, the thickness of the sound insulation pad is 1.0-2.0 mm, the upper surface of the sound insulation pad is covered with an aluminum skin, and the sound-absorbing cotton is laid on the aluminum skin.

5. The noise reducing soundproof floor panel of claim 1, wherein: Mounting holes are formed in the ribs on the edges of the lower plate, the mounting holes penetrate the upper plate upwardly, and mounting hole reinforcing blocks with a strength greater than that of the foam core layer are arranged in the foam core layer at the positions of the mounting holes in the upper plate and the lower plate, the mounting hole reinforcing blocks are sandwiched between the two panels, and the mounting holes are formed in the mounting hole reinforcing blocks.

6. The noise reducing acoustical floor panel of claim 5, wherein: The mounting hole reinforcing blocks are aluminum blocks or fiber-reinforced resin foaming blocks with a density of 500-800 kg / m³.

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