CN114319170B - Multistage intelligent noise reduction barrier for railway traffic - Google Patents
Multistage intelligent noise reduction barrier for railway traffic Download PDFInfo
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- CN114319170B CN114319170B CN202210075084.XA CN202210075084A CN114319170B CN 114319170 B CN114319170 B CN 114319170B CN 202210075084 A CN202210075084 A CN 202210075084A CN 114319170 B CN114319170 B CN 114319170B
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- 230000009467 reduction Effects 0.000 title claims abstract description 89
- 230000004888 barrier function Effects 0.000 title claims abstract description 31
- 230000000712 assembly Effects 0.000 claims abstract description 11
- 238000000429 assembly Methods 0.000 claims abstract description 11
- 230000030279 gene silencing Effects 0.000 claims description 13
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 125000003003 spiro group Chemical group 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 5
- 230000008030 elimination Effects 0.000 abstract description 2
- 238000003379 elimination reaction Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 12
- 238000009434 installation Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000001743 silencing effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T30/00—Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
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Abstract
The invention relates to the technical field of railway noise reduction equipment, and discloses a multistage intelligent noise reduction barrier for railway traffic, which comprises a placing frame, wherein a plurality of groups of noise reduction assemblies are arranged on the inner wall of the placing frame, each group of noise reduction assemblies comprises a supporting frame, a conical sound collecting hopper is arranged on the inner wall of each group of supporting frame, and a noise reduction sleeve is fixedly arranged on the back surface of each group of conical sound collecting hopper through a hexagon bolt and a hexagon nut. This multistage intelligence noise barrier of making an uproar falls in railway transportation, through the acoustic control switch, make the pipeline fan form the turbulent air current in the front of device, noise sound wave is effectively subtracted through the energy of its inside of turbulent air current's in-process, noise sound wave after the reduction is by the passive operation of making an uproar of falling of component execution again, effectively improved the noise elimination effect of device in the reply ultra-high noise in-process, the travelling comfort of resident and waiting personnel in living environment and waiting environment has been strengthened, thereby the practicality of device has been strengthened.
Description
Technical Field
Technical Field
The invention relates to the technical field of railway noise reduction equipment, in particular to a multistage intelligent noise reduction barrier for railway traffic.
Background
Because the train or the high-speed rail rubs with the railway and the air in the running process and can generate higher noise in decibels, the residential areas and the parking stations which are positioned nearby the railway are influenced by the noise, and the noise reduction barrier in use mainly blocks the transmission of direct noise and sufficiently attenuates the diffraction noise, so that residents and waiting staff are positioned in the sound-shadow area with smaller noise.
Accordingly, the inventor has the problem of providing a multistage intelligent noise reduction barrier for railway traffic by taking the experience of design development and actual manufacturing in the related industry for many years and researching and improving the existing structure and the defects.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a multistage intelligent noise reduction barrier for railway traffic, which solves the problems in the prior art.
(II) technical scheme
In order to achieve the above purpose, the present invention provides the following technical solutions: the multistage intelligent noise reduction barrier for railway traffic comprises a placement frame, the inner wall of the placement frame is provided with a plurality of groups of noise reduction assemblies, each group of noise reduction assemblies comprises a support frame, each group of the inner wall of the support frame is provided with a conical sound collection bucket, the back of each group of the conical sound collection bucket is fixedly provided with a noise reduction sleeve through a hexagonal bolt and a nut, the input end of each group of the noise reduction sleeve is communicated with the output end of the corresponding conical sound collection bucket, the inside of each group of the noise reduction sleeve is provided with a pipeline fan, the inner wall of each group of the noise reduction sleeve is fixedly connected with the outer surface of the corresponding pipeline fan through a plurality of groups of refraction bent plates, the inner wall of each group of the conical sound collection bucket is fixedly provided with a vacuum refraction disc through a plurality of groups of first connecting rods, the inner wall of each group of the conical sound collection bucket is fixedly provided with a refraction vacuum pipe through a plurality of groups of second connecting rods, the back of each group of the noise reduction sleeve is fixedly provided with a reflection taper ring through a hexagonal bolt and a nut, the output end of each group of the noise reduction sleeve is respectively connected with the output end of the corresponding pipeline fan through a plurality of groups of sound control bent plates, the front face of the sound control frame is fixedly sleeved with a plurality of groups of sound control switches fixedly arranged on the inner wall of the sound control frames, each group of the sound control frames is fixedly connected with the front face of the sound control frames is fixedly provided with a plurality of sound control frames respectively, and fixing nuts are screwed on the outer surfaces of each group of fixing studs.
Preferably, each group of the outer surfaces of the cone sound collecting hopper, the silencing sleeve, the refraction bending plate, the vacuum refraction disc, the refraction vacuum taper pipe, the reflection taper ring, the ventilation pipe and the placement frame are all provided with anti-corrosion coatings.
Preferably, the back of each group of supporting frame all is provided with warning sign, and the back of each group of warning sign all is provided with information sign.
Preferably, the left side and the right side of the back of each group of the supporting frames are respectively provided with a lifting handle, and the outer surface of each group of the lifting handles is sleeved with an anti-skid handle sleeve.
Preferably, locknuts are screwed on the outer surfaces of the fixing studs in each group, and the rear ends of the fixing nuts in each group are attached to the front ends of the corresponding locknuts.
Preferably, the inner wall of the placement frame is provided with a plurality of groups of mounting plates, a plurality of groups of expansion nail holes are formed in the top of each group of mounting plates, and expansion bolts are sleeved on the inner wall of each group of expansion nail holes in a sliding manner.
Preferably, each group of the conical sound collecting hoppers and the inner wall of the reflecting cone ring are provided with honeycomb noise reduction layers, and each group of the honeycomb noise reduction layers is made of sound absorbing cotton.
(III) beneficial effects
Compared with the prior art, the invention provides a multistage intelligent noise reduction barrier for railway traffic, which has the following beneficial effects:
1. this multistage intelligence noise barrier of making an uproar falls in railway transportation, through the acoustic control switch, make the pipeline fan form the turbulent air current in the front of device, noise sound wave is effectively subtracted through the energy of its inside of turbulent air current's in-process, noise sound wave after the reduction is by the passive operation of making an uproar of falling of component execution again, effectively improved the noise elimination effect of device in the reply ultra-high noise in-process, the travelling comfort of resident and waiting personnel in living environment and waiting environment has been strengthened, thereby the practicality of device has been strengthened.
2. This multistage intelligence noise barrier of making an uproar falls in railway traffic, through the refraction bent plate, when the noise in the device protected railway area is in the settlement within range, noise sound wave is collected by toper sound collecting hopper, vacuum refraction dish and refraction vacuum taper pipe at air conduction's in-process and is transmitted between amortization sleeve pipe and the pipeline fan, then noise sound wave is offset through self angle mutual reflection by the refraction bent plate, has improved the flexibility of device under different noise environment, has effectively reduced the operation energy consumption of device to the suitability of device has been strengthened.
3. According to the multistage intelligent noise reduction barrier for railway traffic, through the noise reduction components, operators calculate long and high data according to the range of a sound image area required to be built by the device, the number of the noise reduction components is selected according to a principle after the calculation of the long and high data of the device is completed, then the noise reduction components are fixed through the fixing nuts and the fixing studs, the self modularization degree of the device is effectively improved, the speed of building and installing the device is accelerated, and therefore the practicability of the device is enhanced.
4. This multistage intelligent noise barrier of making an uproar falls in railway transportation, through porous amortization filling piece, make the noise sound wave of the most of making an uproar that falls the solid structure transmission of subassembly of amortization in the process pass through in the porous amortization filling piece of making an uproar, porous amortization filling piece is through the characteristic of self porous structure with the energy consumption attenuation of noise sound wave, has effectively reduced the quantity of device self solid structure transmission noise sound wave, has further improved the noise reduction effect of device to the suitability of device has been strengthened.
Drawings
FIG. 1 is a schematic diagram of a multistage intelligent noise reduction barrier structure for railway traffic;
FIG. 2 is a bottom view of a multi-stage intelligent noise reduction barrier structure for rail transit in accordance with the present invention;
FIG. 3 is a rear view of a noise reduction assembly of a multistage intelligent noise reduction barrier structure for railway traffic according to the present invention;
FIG. 4 is a cross-sectional view of a noise reduction assembly with a multi-stage intelligent noise reduction barrier structure for railway traffic according to the present invention;
fig. 5 is a schematic diagram of an exploded perspective view of a noise reduction assembly with a multistage intelligent noise reduction barrier structure for railway traffic.
In the figure: 1. placing a frame; 2. a noise reduction assembly; 3. a support frame; 4. conical sound collecting hopper; 5. a sound deadening sleeve; 6. a duct fan; 7. a refractive curved plate; 8. a first connecting rod; 9. a vacuum refractive disk; 10. a second connecting rod; 11. refractive vacuum taper pipe; 12. a reflective cone ring; 13. a ventilation pipe; 14. porous silencing filler blocks; 15. a sound control switch; 16. caution label; 17. a lifting handle; 18. a fixing plate; 19. fixing a stud; 20. a fixing nut; 21. a locknut; 22. a mounting plate; 23. an expansion bolt.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-5, the present invention provides a technical solution: the multistage intelligent noise reduction barrier for railway traffic comprises a placement frame 1, wherein a plurality of groups of noise reduction assemblies 2 are arranged on the inner wall of the placement frame 1, each group of noise reduction assemblies 2 comprises a support frame 3, a conical sound collecting hopper 4 is arranged on the inner wall of each group of support frames 3, a noise reduction sleeve 5 is fixedly arranged on the back surface of each group of conical sound collecting hopper 4 through a hexagonal bolt and a nut, the input end of each group of noise reduction sleeve 5 is communicated with the output end of the corresponding conical sound collecting hopper 4, a pipeline fan 6 is arranged in each group of noise reduction sleeve 5, the inner wall of each group of noise reduction sleeve 5 is fixedly connected with the outer surface of the corresponding pipeline fan 6 through a plurality of groups of refraction bent plates 7, a vacuum refraction disc 9 is fixedly arranged on the inner wall of each group of conical sound collecting hoppers 4 through a plurality of groups of first connecting rods 8, a refraction vacuum taper pipe 11 is fixedly arranged on the inner wall of each group of conical sound collecting hoppers 4 through a plurality of groups of second connecting rods 10, the rear end of each group of silencing sleeves 5 is fixedly provided with a reflecting conical ring 12 through hexagonal bolts and nuts, the back surface of each group of reflecting conical rings 12 is respectively inserted with a ventilating pipe 13, the output end of each group of ventilating pipes 13 is communicated with the input end of a corresponding pipeline fan 6, the inner wall of each group of supporting frames 3 is provided with a porous silencing filling block 14, the front surface of the placing frame 1 is fixedly provided with a sound control switch 15, the specific model of the sound control switch 15 is A021, the input end of each group of pipeline fans 6 is electrically connected with the output end of the sound control switch 15 through a lead, the outer surface of each group of supporting frames 3 is provided with a plurality of groups of fixing plates 18, the front surface of each group of fixing plates 18 is provided with a plurality of groups of fixing studs 19, the inner wall of each group of fixing holes is sleeved with the outer surface of the corresponding fixing studs 19 in a sliding way, the outer surface of each set of fixing studs 19 is provided with a fixing nut 20.
In the invention, in order to prolong the service life of the device, the outer surfaces of each group of cone-shaped sound collecting hopper 4, the silencing sleeve 5, the refraction bending plate 7, the vacuum refraction disc 9, the refraction vacuum taper pipe 11, the reflection taper ring 12, the ventilation pipe 13 and the placement frame 1 are respectively provided with an anti-corrosion coating for isolating outside air and moisture, so that the corrosion speed of the cone-shaped sound collecting hopper 4, the silencing sleeve 5, the refraction bending plate 7, the vacuum refraction disc 9, the refraction vacuum taper pipe 11, the reflection taper ring 12, the ventilation pipe 13 and the placement frame 1 is reduced, and the service life of the device is prolonged.
In the invention, in order to reduce the probability of misusing the device by non-operators, the back surface of each group of supporting frames 3 is provided with the warning sign 16, and the back surface of each group of warning sign 16 is provided with the information mark for providing the non-operators with the information of the device without operation, thereby reducing the probability of misusing the device by the non-operators.
In the invention, in order to improve the convenience of the device in the process of installation and transportation, the left side and the right side of the back surface of each group of supporting frames 3 are respectively provided with the lifting handles 17 for providing a force position in the process of transportation or installation of the noise reduction assembly 2, and the outer surface of each group of lifting handles 17 is sleeved with an anti-skid handle sleeve, so that the convenience of the device in the process of installation and transportation is improved.
In the invention, in order to improve the stability of the device in the operation process, the locknuts 21 for providing pretightening force for the fixed nuts 20 are screwed on the outer surface of each group of fixed studs 19, so that the loosening probability of the fixed nuts 20 is reduced, and the rear end of each group of fixed nuts 20 is attached to the front end of the corresponding locknut 21, so that the stability of the device in the operation process is improved.
In the invention, in order to improve the stability of the device in the operation process, a plurality of groups of mounting plates 22 are arranged on the inner wall of the placement frame 1, a plurality of groups of expansion nail holes are formed at the top of each group of mounting plates 22, and expansion bolts 23 used for fixedly connecting the device with the mounting ground are slidably sleeved on the inner wall of each group of expansion nail holes, so that the stability of the device in the operation process is improved.
In the invention, in order to further improve the silencing effect of the device, the inner walls of each group of cone-shaped sound collecting hoppers 4 and the reflecting cone rings 12 are respectively provided with a honeycomb noise reduction layer for absorbing noise waves through the self porous structure, and each group of honeycomb noise reduction layers is made of sound absorption cotton, so that the area of noise reduction dead angles of the device is reduced, and the silencing effect of the device is further improved.
The electrical components are all connected with an external main controller and 220V mains supply, and the main controller can be conventional known equipment for controlling a computer and the like.
When in use, firstly, the length data of the device is calculated according to the range of the sound image area to be built, after the calculation of the length data of the device is completed, the number of the noise reduction components 2 is selected according to a principle, the placement frame 1 is manufactured after the number of the noise reduction components 2 is selected, then the placement frame 1 is fixedly installed at a set position, the noise reduction components 2 are fixed through the fixing nuts 20 and the fixing studs 19 after the installation of the placement frame 1 is completed, the noise reduction operation is carried out after the installation of the device is completed, when the noise in the railway area protected by the device is within the set range, the noise wave is collected by the cone-shaped sound collecting hopper 4 and reflected to the surface of the vacuum refraction disc 9 in the air conduction process, the vacuum refraction disc 9 transmits most of noise wave reflection to the outer surface of the refraction vacuum cone 11 through the sound insulation characteristic point of the vacuum cavity in the vacuum refraction disc 9, the refraction vacuum taper pipe 11 transmits most noise sound wave reflection to the space between the silencing sleeve 5 and the pipeline fan 6 through the sound insulation characteristic point of the vacuum cavity in the refraction vacuum taper pipe 11, the noise sound wave between the silencing sleeve 5 and the pipeline fan 6 is mutually reflected and counteracted by the refraction bending plate 7 through the self angle in the transmission process, the residual noise sound wave passing through the refraction bending plate 7 is reflected and counteracted by the reflection taper ring 12, most noise sound wave transmitted through the solid structure of the noise reduction assembly 2 in the silencing process is transmitted to the porous silencing filling block 14, the porous silencing filling block 14 attenuates the energy consumption of the noise sound wave through the characteristic of the porous structure of the porous silencing filling block, at the moment, the device completes passive noise reduction operation, when the noise in the protected railway area of the device exceeds the set range, the sound control switch 15 controls the pipeline fan 6 to start, the pipeline fan 6 inputs reverse airflow into the cone-shaped sound collecting hopper 4 through the ventilation pipe 13, the reverse airflow in the cone-shaped sound collecting hopper 4 is sprayed to the surface of the vacuum refraction disc 9 under the guidance of the refraction vacuum taper pipe 11, the vacuum refraction disc 9 guides the reverse airflow to be output from the input end of the cone-shaped sound collecting hopper 4, at the moment, the reverse airflows output by the plurality of groups of cone-shaped sound collecting hoppers 4 form turbulent airflows from the front of the device under mutual interference, the energy in the noise sound wave passing through the turbulent airflows is effectively reduced, at the moment, the device completes the active noise reduction operation, the noise sound wave after the reduction is subjected to the passive noise reduction operation by the noise reduction assembly 2 again, and the sound control switch 15 controls the pipeline fan 6 to be turned off after the noise in the railway area protected by the device is restored to be within a set range.
In summary, according to the multistage intelligent noise reduction barrier for railway traffic, through the voice control switch 15, the pipeline fan 6 forms turbulent airflow on the front surface of the device, the energy in the noise sound wave passing through the turbulent airflow is effectively reduced, the noise sound wave after the reduction is subjected to passive noise reduction operation by the noise reduction component 2 again, the noise reduction effect of the device in the process of coping with ultra-high noise is effectively improved, the comfortableness of residents and waiting persons in living environments and waiting environments is enhanced, and therefore the practicability of the device is enhanced.
This multistage intelligence noise barrier of making an uproar falls in railway traffic, through refraction bent plate 7, when the noise in the device protected railway area is in the settlement within range, noise sound wave is collected by toper collection sound bucket 4, vacuum refraction dish 9 and refraction vacuum taper pipe 11 at air conduction's in-process and is transmitted between noise reduction sleeve pipe 5 and the pipeline fan 6, noise sound wave is offset by refraction bent plate 7 through self angle mutual reflection afterwards, the flexibility of device under different noise environment has been improved, the operation energy consumption of device has effectively been reduced, thereby the suitability of device has been strengthened.
According to the multistage intelligent noise reduction barrier for railway traffic, through the noise reduction assembly 2, operators calculate the length and height data according to the range of the sound image area required to be built by the device, the number of the noise reduction assemblies 2 is selected according to a principle after the calculation of the length and height data of the device is completed, then the noise reduction assemblies 2 are fixed through the fixing nuts 20 and the fixing studs 19, the self-modularization degree of the device is effectively improved, the building and installation speed of the device is accelerated, and therefore the practicability of the device is enhanced.
This multistage intelligent noise barrier of making an uproar falls in railway transportation, through porous amortization filling piece 14, make the noise sound wave of the majority that the noise in-process was passed through the solid structure of noise reduction subassembly 2 transmit in porous amortization filling piece 14, porous amortization filling piece 14 is through the characteristic of self porous structure with the energy consumption attenuation of noise sound wave, effectively reduced the quantity of device self solid structure transmission noise sound wave, further improved the noise reduction effect of device to the suitability of device has been strengthened.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents. .
Claims (7)
1. The utility model provides a multistage intelligence noise barrier of making an uproar, is including placing frame (1), its characterized in that: the inner wall of the placement frame (1) is provided with a plurality of groups of noise reduction assemblies (2), each group of noise reduction assemblies (2) comprises a support frame (3), each group of noise reduction assemblies is provided with a conical sound collecting hopper (4) on the inner wall of the support frame (3), a noise reduction sleeve (5) is fixedly arranged on the back surface of each conical sound collecting hopper (4) through a plurality of groups of second connecting rods (10), the input end of each noise reduction sleeve (5) is communicated with the output end of the corresponding conical sound collecting hopper (4), a pipeline fan (6) is arranged in each group of noise reduction sleeve (5), the inner wall of each noise reduction sleeve (5) is fixedly connected with the outer surface of the corresponding pipeline fan (6) through a plurality of groups of refraction bent plates (7), a vacuum refraction disc (9) is fixedly arranged on the inner wall of each conical sound collecting hopper (4) through a plurality of groups of first connecting rods (8), a refraction cone vacuum pipe (11) is fixedly arranged on the inner wall of each group of conical sound collecting hopper (4) through a plurality of groups of second connecting rods (10), the back end of each noise reduction sleeve (5) is fixedly connected with the output end of the corresponding cone fan (13) through a reflection ring (13) through a plurality of cone rings (12), every group braced frame (3)'s inner wall all is provided with porous amortization filling piece (14), place the front fixed mounting of frame (1) have acoustic control switch (15), every group the input of pipeline fan (6) all passes through the wire electricity with the output of acoustic control switch (15) and is connected, every group braced frame (3)'s surface all is provided with multiunit fixed plate (18), every group fixed orifices have all been seted up in the front of fixed plate (18), place the back of frame (1) and be equipped with multiunit fixed double-screw bolt (19), every group the inner wall of fixed orifices all with the slidable suit of the surface of corresponding fixed double-screw bolt (19), every group fixed nut (20) are all spiro union to the surface of fixed double-screw bolt (19).
2. The multi-stage intelligent noise reduction barrier for railway traffic of claim 1, wherein: each group of the conical sound collecting hoppers (4), the silencing sleeves (5), the refraction bent plates (7), the vacuum refraction discs (9), the refraction vacuum taper pipes (11), the reflection taper rings (12), the ventilation pipes (13) and the outer surfaces of the placement frames (1) are provided with anti-corrosion coatings.
3. The multi-stage intelligent noise reduction barrier for railway traffic of claim 1, wherein: the back of each group of supporting frame (3) all is provided with warning sign (16), and the back of every group warning sign (16) all is provided with information sign.
4. The multi-stage intelligent noise reduction barrier for railway traffic of claim 1, wherein: the left side and the right side of the back of each group of the supporting frames (3) are respectively provided with a lifting handle (17), and the outer surface of each group of the lifting handles (17) is sleeved with an anti-skid handle sleeve.
5. The multi-stage intelligent noise reduction barrier for railway traffic of claim 1, wherein: and locknuts (21) are screwed on the outer surface of each group of fixing studs (19), and the rear ends of each group of fixing nuts (20) are attached to the front ends of the corresponding locknuts (21).
6. The multi-stage intelligent noise reduction barrier for railway traffic of claim 1, wherein: the inner wall of the placement frame (1) is provided with a plurality of groups of mounting plates (22), the top of each group of mounting plates (22) is provided with a plurality of groups of expansion nail holes, and the inner wall of each group of expansion nail holes is sleeved with expansion bolts (23) in a sliding way.
7. The multi-stage intelligent noise reduction barrier for railway traffic of claim 1, wherein: each group of the inner walls of the cone sound collecting hopper (4) and the reflecting cone ring (12) are provided with honeycomb noise reduction layers, and each group of the honeycomb noise reduction layers is made of sound absorbing cotton.
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| CN202210075084.XA CN114319170B (en) | 2022-01-22 | 2022-01-22 | Multistage intelligent noise reduction barrier for railway traffic |
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| US5606622A (en) * | 1994-09-29 | 1997-02-25 | The Boeing Company | Active noise control in a duct with highly turbulent airflow |
| CN206727802U (en) * | 2017-04-04 | 2017-12-08 | 安徽海盾建材有限公司 | A kind of new material production denoising device |
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