Multi-layer splicing multi-frequency sound absorption and noise reduction barrier

Abstract

The application discloses a multi-frequency band sound-absorbing and noise-reducing screen which can be spliced in multiple layers, comprising: a front screen assembly, a rear screen assembly and an inner clamp assembly; the front screen assembly comprises a sound guide plate, a first horizontal component and a first vertical component; two first horizontal components are fixed to the top and bottom of the sound guide plate respectively; two first vertical components are fixed to the two side faces of the sound guide plate respectively; the rear screen assembly comprises a rear screen plate, a second horizontal component and a second vertical component; the inside of the rear screen plate is filled with a first sound-absorbing material; two second horizontal components are fixed to the top and bottom of the rear screen plate respectively; two second vertical components are fixed to the two side faces of the rear screen plate respectively; the inner clamp assembly comprises an inner clamp plate, a third horizontal component and a third vertical component; two third horizontal components are fixed to the top and bottom of the inner clamp plate respectively; two third vertical components are fixed to the two side faces of the inner clamp plate respectively; and the inside of the inner clamp plate is filled with a second sound-absorbing material. The screen is convenient to splice and has good sound-absorbing effect.

Description

Technical Field

[0001] This invention relates to the field of sound absorption and noise reduction technology in civil engineering, and more specifically to a multi-band sound absorption and noise reduction barrier that can be spliced ​​in multiple layers. Background Technology

[0002] In civil engineering projects such as the construction of residential buildings, high-rise structures, large-span structures, highways, railways, and dams, various types of machinery and equipment are frequently used, generating construction noise at different frequencies. This noise severely affects the rest and work of nearby residents and workers. Therefore, noise barriers have become a current research hotspot, effectively reducing or even preventing the harm caused by construction noise to people's physical and mental health, and promoting healthier and more environmentally friendly construction sites in civil engineering.

[0003] Generally, the noise generated during civil engineering construction is often complex and has multi-frequency characteristics. Fixed noise barriers can only absorb noise in a limited range of frequencies, making it difficult to effectively reduce the spread of multi-frequency construction noise and its impact on people's health.

[0004] Therefore, developing a multi-band sound-absorbing and noise-reducing barrier that is easy to assemble and has good sound absorption effect is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a multi-band sound-absorbing and noise-reducing barrier that is easy to splice and has good sound absorption effect and can be spliced ​​in multiple layers.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A multi-layer, multi-band sound-absorbing and noise-reducing barrier, comprising:

[0008] A front screen assembly includes: a sound guide plate, a first horizontal member, and a first vertical member; the surface of the sound guide plate is evenly provided with a plurality of sound guide holes; two first horizontal members are provided and are respectively fixed to the top and bottom of the sound guide plate; two first vertical members are provided and are respectively fixed to the two sides of the sound guide plate.

[0009] A rear screen assembly includes: a rear screen panel, a second horizontal member, and a second vertical member; the rear screen panel is filled with a first sound-absorbing material; two second horizontal members are provided and fixed to the top and bottom of the rear screen panel respectively; two second vertical members are provided and fixed to the two sides of the rear screen panel respectively; positioning grooves are fixed on the outer sides of the first and second vertical members located on the same side as the sound guide plate and the rear screen panel; positioning protrusions are fixed on the outer sides of the first and second vertical members on the other side.

[0010] An inner clamping assembly is provided, and multiple inner clamping assemblies are stacked and fixed between the front screen assembly and the rear screen assembly; the inner clamping assembly includes: an inner clamping plate, a third horizontal member, and a third vertical member; the interior of the inner clamping plate is filled with a second sound-absorbing material; two third horizontal members are provided and fixed to the top and bottom of the inner clamping plate respectively; two third vertical members are provided and fixed to the two sides of the inner clamping plate respectively.

[0011] The beneficial effects of adopting the above technical solution are that, in this invention, adjacent front screen components and adjacent rear screen components are connected by positioning grooves and positioning protrusions, which makes it convenient to splice up barriers of the corresponding size according to actual needs; the rear screen panel is filled with a first sound-absorbing material and the inner clamping plate is filled with a second sound-absorbing material, which can absorb and reduce noise by using sound-absorbing materials with different sound absorption band characteristics as needed.

[0012] Preferably, the rear screen panel includes: a support plate, a first support strip, and a first wire mesh; the support plate is located on the side of the rear screen panel away from the inner clamping plate; the first wire mesh is arranged parallel to the support plate, and the first sound-absorbing material is filled between the first wire mesh and the support plate; two first support strips are provided and fixed between the support plate and the first wire mesh, located on both sides of the support plate and the first wire mesh; the second vertical member is fixedly connected to the first support strip. The first wire mesh not only limits the first sound-absorbing material but also facilitates the sound absorption and noise reduction of the first sound-absorbing material.

[0013] Preferably, the inner clamping plate includes: a second support strip and a second wire mesh; two second wire meshes are provided and arranged in parallel, and the second sound-absorbing material is filled between the two second wire meshes; two second support strips are provided and fixed between the two second wire meshes, located on both sides of the second wire meshes; the third vertical member is fixedly connected to the second support strips. The arrangement of the second wire mesh facilitates noise to pass through the inner clamping plate for multiple sound absorption and noise reduction.

[0014] Preferably, a first splicing rod is fixed to the side of the first vertical member near the inner clamping plate; a second splicing rod is fixed to the side of the second vertical member near the inner clamping plate; a second splicing rod is fixed to the side of the third vertical member near the sound guide plate, and a first splicing rod is fixed to the side of the third vertical member near the rear screen plate; the first splicing rod and the second splicing rod are respectively located at opposite ends of the two side walls of the third vertical member, and are spliced ​​together. The arrangement of the first splicing rod and the second splicing rod facilitates the splicing and fixing of the front screen assembly, the rear screen assembly, and multiple inner clamping assemblies.

[0015] Preferably, a splicing hole is provided on the side where the first splicing rod and the second splicing rod are spliced; a splicing spring buckle is provided at the position corresponding to the splicing hole on the second splicing rod, and the splicing spring buckle is connected to the splicing hole. The splicing spring buckle is inserted into the splicing hole for splicing and fixing, making assembly and disassembly more convenient.

[0016] Preferably, the splicing spring buckle includes: a spring buckle pin, a return spring, a limiting plate, and a pull ring; the second splicing rod has a sliding cavity inside, and sliding holes are opened on both sides of the second splicing rod corresponding to the splicing hole; the spring buckle pin passes through the sliding hole, and one end of the spring buckle pin extending out of the sliding cavity is inserted into the splicing hole; the limiting plate is fixed to the outside of the spring buckle pin and is placed inside the sliding cavity near one end of the first splicing rod; the return spring is sleeved on the outside of the spring buckle pin, and the return spring is placed inside the sliding cavity and between the sliding cavity and the limiting plate; the pull ring is fixed to the outer end of the spring buckle pin. By pulling the pull ring, the spring buckle pin can be pulled to adjust its position, thereby realizing the insertion and separation between the spring buckle pin and the splicing hole, which is convenient for disassembly and assembly.

[0017] Preferably, roller devices are provided at both ends of the bottom of the first horizontal member at the lower end of the front screen assembly and at both ends of the bottom of the second horizontal member at the lower end of the rear screen assembly. The roller devices facilitate the movement of the barrier.

[0018] Preferably, the roller device includes: a fixed rod, a vertical rotating rod, a horizontal rotating rod, and a roller; the top of the fixed rod is connected to the bottom of the first horizontal member or the second horizontal member, the vertical rotating rod is connected to the bottom of the fixed rod, the horizontal rotating rod is arranged perpendicularly to the vertical rotating rod, and one end of the horizontal rotating rod is connected to the vertical rotating rod, and the other end is rotatably connected to the roller.

[0019] Preferably, the first sound-absorbing material is closed-cell aluminum foam; the second sound-absorbing material is one or more of glass wool, polyester fiber, or open-cell aluminum foam.

[0020] Preferably, the diameter of the splicing hole is 1-2 mm larger than the diameter of the spring-loaded pin; the diameter of the sliding hole is 1-2 mm larger than the diameter of the spring-loaded pin. This dimensional arrangement facilitates the movement of the spring-loaded pin within the sliding hole and facilitates insertion and separation from the splicing hole.

[0021] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a multi-band sound absorption and noise reduction barrier that can be spliced ​​in multiple layers, and its beneficial effects are as follows:

[0022] (1) In this invention, the front screen assembly is provided with a sound guide plate, and the inner clamping plate and the rear screen plate are filled with sound-absorbing material. Different numbers and thicknesses of inner clamping plates and different sound-absorbing materials can be selected according to the spectral characteristics of construction noise to achieve multi-band sound absorption and noise reduction control.

[0023] (2) The sound guide plate, rear screen plate and multiple inner plates are spliced ​​together by splicing snaps and splicing holes, which makes them easy to assemble and disassemble and has greater applicability.

[0024] (3) The noise reduction barrier is equipped with a roller device. Each noise reduction barrier is engaged by positioning grooves and positioning protrusions, which makes it easy to move and expand, and the layout is flexible, thus improving work efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 A front view of the barrier provided by the present invention;

[0027] Figure 2 Top view of the barrier provided by the present invention;

[0028] Figure 3 Provided by the present invention Figure 1 Sectional view at point AA;

[0029] Figure 4 Right view of the barrier provided by the present invention;

[0030] Figure 5 Provided by the present invention Figure 1 Sectional view at point BB;

[0031] Figure 6 A front view of the front screen assembly provided by the present invention;

[0032] Figure 7 Rear view of the front screen assembly provided by the present invention;

[0033] Figure 8 A top view of the front screen assembly provided by the present invention;

[0034] Figure 9 Provided by the present invention Figure 6 Sectional view at CC;

[0035] Figure 10 A left view of the front screen assembly provided by the present invention;

[0036] Figure 11 Right view of the front screen assembly provided by the present invention;

[0037] Figure 12 Provided by the present invention Figure 6 Sectional view at point DD;

[0038] Figure 13 A front view of the rear screen assembly provided by the present invention;

[0039] Figure 14 Rear view of the rear screen assembly provided by the present invention;

[0040] Figure 15 A top view of the rear screen assembly provided by the present invention;

[0041] Figure 16 Provided by the present invention Figure 13 Sectional view at EE;

[0042] Figure 17 Left view of the rear screen assembly provided by the present invention;

[0043] Figure 18 Right view of the rear screen assembly provided by the present invention;

[0044] Figure 19 Provided by the present invention Figure 13 Sectional view at FF;

[0045] Figure 20 A front view of the inner clamping component provided by the present invention;

[0046] Figure 21 Rear view of the inner clamping component provided by the present invention;

[0047] Figure 22 A top view of the inner clamping component provided by the present invention;

[0048] Figure 23 Provided by the present invention Figure 20 Sectional view at point GG;

[0049] Figure 24 Left view of the inner clamping component provided by the present invention;

[0050] Figure 25 Right view of the inner clamping component provided by the present invention;

[0051] Figure 26 Provided by the present invention Figure 20 Sectional view at HH;

[0052] Figure 27This is a process diagram illustrating the connection between the splicing spring buckle and the splicing hole provided by the present invention. In the diagram,

[0053] 1-Front screen assembly;

[0054] 11-Sound guide plate;

[0055] 111 - Sound guide hole;

[0056] 12-First horizontal member; 13-First vertical member;

[0057] 2- Rear screen assembly;

[0058] 21-Rear screen panel;

[0059] 211-Support plate; 212-First support strip; 213-First wire mesh;

[0060] 22-Second horizontal component; 23-Second vertical component; 24-First sound-absorbing material; 3-Positioning groove; 4-Positioning protrusion;

[0061] 5-Internal clamping components;

[0062] 51-Inner plate;

[0063] 511 - Second support strip; 512 - Second wire mesh;

[0064] 52 - Third horizontal component; 53 - Third vertical component; 54 - Second sound-absorbing material;

[0065] 6-First splicing rod;

[0066] 61 - Splicing hole;

[0067] 7-Second splicing rod;

[0068] 71-Assembled spring buckle;

[0069] 711-Snap-on pin; 712-Reset spring; 713-Limit plate; 714-Pull ring;

[0070] 72-Sliding cavity; 73-Sliding hole;

[0071] 8-Roller assembly;

[0072] 81-Fixed rod; 82-Vertical rotating rod; 83-Horizontal rotating rod; 84-Roller. Detailed Implementation

[0073] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0074] This invention discloses a multi-band sound-absorbing and noise-reducing barrier that can be spliced ​​in multiple layers, comprising:

[0075] The front screen assembly 1 includes: a sound guide plate 11, a first horizontal member 12, and a first vertical member 13; the surface of the sound guide plate 11 is evenly provided with a plurality of sound guide holes 111; there are two first horizontal members 12, which are respectively fixed to the top and bottom of the sound guide plate 11; there are two first vertical members 13, which are respectively fixed to the two sides of the sound guide plate 11.

[0076] The rear screen assembly 2 includes a rear screen panel 21, a second horizontal member 22, and a second vertical member 23. The interior of the rear screen panel 21 is filled with a first sound-absorbing material 24. Two second horizontal members 22 are provided and fixed to the top and bottom of the rear screen panel 21, respectively. Two second vertical members 23 are provided and fixed to the two sides of the rear screen panel 21, respectively. The outer sides of the first vertical member 13 and the second vertical member 23 located on the same side as the sound guide plate 11 and the rear screen panel 21 are fixed with positioning grooves 3. The outer sides of the first vertical member 13 and the second vertical member 23 on the other side are fixed with positioning protrusions 4.

[0077] The inner clamping assembly 5, in multiple forms, is stacked and fixed between the front screen assembly 1 and the rear screen assembly 2. The inner clamping assembly 5 includes: an inner clamping plate 51, a third horizontal member 52, and a third vertical member 53. The inner clamping plate 51 is filled with a second sound-absorbing material 54. Two third horizontal members 52 are provided and fixed to the top and bottom of the inner clamping plate 51, respectively. Two third vertical members 53 are provided and fixed to the two sides of the inner clamping plate 51, respectively. Multiple inner clamping assemblies 5 can be added according to actual usage needs.

[0078] To further optimize the above technical solution, the rear screen panel 21 includes: a support plate 211, a first support strip 212, and a first wire mesh 213; the support plate 211 is located on the side of the rear screen panel 21 away from the inner clamping plate 51; the first wire mesh 213 is arranged parallel to the support plate 211, and the first sound-absorbing material 24 is filled between the first wire mesh 213 and the support plate 211; two first support strips 212 are provided and fixed between the support plate 211 and the first wire mesh 213, located on both sides of the support plate 211 and the first wire mesh 213; the second vertical member 23 is fixedly connected to the first support strip 212.

[0079] To further optimize the above technical solution, the inner clamping plate 51 includes: a second support strip 511 and a second wire mesh 512; two second wire meshes 512 are provided and arranged in parallel, and a second sound-absorbing material 54 is filled between the two second wire meshes 512; two second support strips 511 are provided and fixed between the two second wire meshes 512, located on both sides of the second wire meshes 512; a third vertical member 53 is fixedly connected to the second support strips 511. The second sound-absorbing material 54 in each inner clamping plate 51 can be different. Different sound-absorbing materials and different numbers and thicknesses of inner clamping plates can be selected according to the spectral characteristics of construction noise to achieve multi-band sound absorption and noise reduction control.

[0080] To further optimize the above technical solution, a first splicing rod 6 is fixed on the side of the first vertical member 13 near the inner clamping plate 51; a second splicing rod 7 is fixed on the side of the second vertical member 23 near the inner clamping plate 51; a second splicing rod 7 is fixed on the side of the third vertical member 53 near the sound guide plate 11, and a first splicing rod 6 is fixed on the side near the rear screen plate 21; the first splicing rod 6 and the second splicing rod 7 are respectively located at the two opposite ends of the two side walls of the third vertical member 53, and are spliced ​​together.

[0081] To further optimize the above technical solution, a splicing hole 61 is provided on one side where the first splicing rod 6 and the second splicing rod 7 are spliced; a splicing spring buckle 71 is provided at the position corresponding to the splicing hole 61 on the second splicing rod 7, and the splicing spring buckle 71 is connected to the splicing hole 61. Multiple splicing holes 61 are evenly provided along the height direction of the first splicing rod.

[0082] To further optimize the above technical solution, the splicing spring buckle 71 includes: a spring buckle pin 711, a return spring 712, a limiting plate 713, and a pull ring 714; the second splicing rod 7 has a sliding cavity 72 inside, and sliding holes 73 are opened on both sides of the second splicing rod 7 corresponding to the splicing hole 61. The spring buckle pin 711 passes through the sliding hole 73, and one end of the spring buckle pin 711 extending out of the sliding cavity 72 is inserted into the splicing hole 61; the limiting plate 713 is fixed to the outside of the spring buckle pin 711 and is placed inside the sliding cavity 72 near one end of the first splicing rod 6; the return spring 712 is sleeved on the outside of the spring buckle pin 711, and the return spring 712 is placed inside the sliding cavity 72 and located between the sliding cavity 72 and the limiting plate 713; the pull ring 714 is fixed to the outer end of the spring buckle pin 711.

[0083] To further optimize the above technical solution, roller devices 8 are provided at both ends of the bottom of the first horizontal member 12 at the lower end of the front screen assembly 1 and at both ends of the bottom of the second horizontal member 22 at the lower end of the rear screen assembly 2.

[0084] To further optimize the above technical solution, the roller device 8 includes: a fixed rod 81, a vertical rotating rod 82, a horizontal rotating rod 83, and a roller 84; the top of the fixed rod 81 is connected to the bottom of the first horizontal member 12 or the second horizontal member 22, the vertical rotating rod 82 is connected to the bottom of the fixed rod 81, the horizontal rotating rod 83 is arranged perpendicular to the vertical rotating rod 82, and one end of the horizontal rotating rod 83 is connected to the vertical rotating rod 82, and the other end is rotatably connected to the roller 84.

[0085] To further optimize the above technical solution, the first sound-absorbing material 24 is selected as closed-cell aluminum foam; the second sound-absorbing material 54 is selected as one or more of glass wool, polyester fiber, or open-cell aluminum foam. Figure 3 As shown, there are three inner panels 51. The second sound-absorbing material 54 arranged sequentially from front to back on the three inner panels 51 is open-cell aluminum foam, polyester fiber, and glass wool. The first sound-absorbing material 24 uses closed-cell aluminum foam, which not only ensures the sound insulation effect of the rear panel 21, but also reduces its weight.

[0086] To further optimize the above technical solution, the first horizontal component 12, the first vertical component 13, the second horizontal component 22, the second vertical component 23, the third horizontal component 52, and the third vertical component 53 are made of rectangular tubes.

[0087] To further optimize the above technical solution, the diameter of the splicing hole 61 is 1-2 mm larger than the diameter of the spring-loaded pin 711; the diameter of the sliding hole 73 is 1-2 mm larger than the diameter of the spring-loaded pin 711. This ensures that the spring-loaded pin 711 can be smoothly pulled out and then smoothly inserted into the splicing hole 61, realizing the multi-layer splicing of the sound guide plate 11, the rear screen plate 21, and each inner clamping plate 51.

[0088] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0089] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-band sound-absorbing and noise-reducing barrier that can be spliced ​​in multiple layers, characterized in that, include: The front screen assembly (1) includes: a sound guide plate (11), a first horizontal member (12), and a first vertical member (13); the surface of the sound guide plate (11) is uniformly provided with a plurality of sound guide holes (111); there are two first horizontal members (12), which are respectively fixed to the top and bottom of the sound guide plate (11); there are two first vertical members (13), which are respectively fixed to the two sides of the sound guide plate (11); The rear screen assembly (2) includes: a rear screen panel (21), a second horizontal member (22), and a second vertical member (23); the interior of the rear screen panel (21) is filled with a first sound-absorbing material (24); two second horizontal members (22) are provided and are respectively fixed to the top and bottom of the rear screen panel (21); two second vertical members (23) are provided and are respectively fixed to the two sides of the rear screen panel (21); the outer sides of the first vertical member (13) and the second vertical member (23) located on the same side of the sound guide plate (11) and the rear screen panel (21) are fixed with positioning grooves (3); the outer sides of the first vertical member (13) and the second vertical member (23) on the other side are fixed with positioning protrusions (4); An inner clamping assembly (5) is provided in multiple forms and is stacked and fixed between the front screen assembly (1) and the rear screen assembly (2); the inner clamping assembly (5) includes: an inner clamping plate (51), a third horizontal member (52) and a third vertical member (53); the inner clamping plate (51) is filled with a second sound-absorbing material (54); there are two third horizontal members (52) and they are respectively fixed to the top and bottom of the inner clamping plate (51); there are two third vertical members (53) and they are respectively fixed to the two sides of the inner clamping plate (51); The first vertical member (13) is fixed with a first splicing rod (6) on the side near the inner clamping plate (51); the second vertical member (23) is fixed with a second splicing rod (7) on the side near the inner clamping plate (51); the third vertical member (53) is fixed with a second splicing rod (7) on the side near the sound guide plate (11) and with a first splicing rod (6) on the side near the rear screen plate (21); the first splicing rod (6) and the second splicing rod (7) are located at opposite ends of the two side walls of the third vertical member (53) and are spliced ​​together. A splicing hole (61) is provided on one side where the first splicing rod (6) and the second splicing rod (7) are spliced; a splicing spring buckle (71) is provided at the position corresponding to the splicing hole (61) of the second splicing rod (7), and the splicing spring buckle (71) is connected to the splicing hole (61).

2. The multi-band sound-absorbing and noise-reducing barrier that can be spliced ​​in multiple layers according to claim 1, characterized in that, The rear screen panel (21) includes: a support plate (211), a first support strip plate (212), and a first wire mesh (213); the support plate (211) is located on the side of the rear screen panel (21) away from the inner clamping plate (51); the first wire mesh (213) is arranged parallel to the support plate (211), and the first sound-absorbing material (24) is filled between the first wire mesh (213) and the support plate (211); there are two first support strip plates (212), which are fixed between the support plate (211) and the first wire mesh (213) and located on both sides of the support plate (211) and the first wire mesh (213); the second vertical member (23) is fixedly connected to the first support strip plate (212).

3. The multi-band sound-absorbing and noise-reducing barrier that can be spliced ​​in multiple layers according to claim 1, characterized in that, The inner clamping plate (51) includes: a second support strip (511) and a second wire mesh (512); there are two second wire meshes (512) arranged in parallel, and the second sound-absorbing material (54) is filled between the two second wire meshes (512); there are two second support strips (511) and they are fixed between the two second wire meshes (512) and located on both sides of the second wire meshes (512); the third vertical member (53) is fixedly connected to the second support strip (511).

4. The multi-band sound-absorbing and noise-reducing barrier that can be spliced ​​in multiple layers according to claim 1, characterized in that, The splicing spring buckle (71) includes: a spring buckle pin (711), a return spring (712), a limiting plate (713), and a pull ring (714); the second splicing rod (7) has a sliding cavity (72) inside, and sliding holes (73) are opened on both sides of the second splicing rod (7) corresponding to the splicing hole (61). The spring buckle pin (711) passes through the sliding hole (73), and one end of the spring buckle pin (711) extending out of the sliding cavity (72) is connected to the splicing hole (61). 61) Interlocking; the limiting plate (713) is fixed to the outside of the snap pin (711) and placed inside the sliding cavity (72) near one end of the first splicing rod (6); the return spring (712) is sleeved on the outside of the snap pin (711), the return spring (712) is placed inside the sliding cavity (72) and located between the sliding cavity (72) and the limiting plate (713); the pull ring (714) is fixed to the outer end of the snap pin (711).

5. A multi-layered, multi-band sound-absorbing and noise-reducing barrier according to any one of claims 1, 2, and 4, characterized in that, Roller devices (8) are provided at both ends of the bottom of the first horizontal member (12) at the lower end of the front screen assembly (1) and at both ends of the bottom of the second horizontal member (22) at the lower end of the rear screen assembly (2).

6. A multi-band sound-absorbing and noise-reducing barrier that can be spliced ​​in multiple layers according to claim 5, characterized in that, The roller device (8) includes: a fixed rod (81), a vertical rotating rod (82), a horizontal rotating rod (83), and a roller (84); the top of the fixed rod (81) is connected to the bottom of the first horizontal member (12) or the second horizontal member (22), the vertical rotating rod (82) is connected to the bottom of the fixed rod (81), the horizontal rotating rod (83) is arranged perpendicularly to the vertical rotating rod (82), and one end of the horizontal rotating rod (83) is connected to the vertical rotating rod (82), and the other end is rotatably connected to the roller (84).

7. The multi-band sound-absorbing and noise-reducing barrier that can be spliced ​​in multiple layers according to claim 1, characterized in that, The first sound-absorbing material (24) is selected from closed-cell aluminum foam; the second sound-absorbing material (54) is selected from one or more of glass wool, polyester fiber, or open-cell aluminum foam.

8. A multi-band sound-absorbing and noise-reducing barrier that can be spliced ​​in multiple layers according to claim 4, characterized in that, The diameter of the splicing hole (61) is 1-2 mm larger than the diameter of the spring-loaded pin (711); the diameter of the sliding hole (73) is 1-2 mm larger than the diameter of the spring-loaded pin (711).

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