CN213448072U - Telescopic noise reduction device for road and bridge - Google Patents
Telescopic noise reduction device for road and bridge Download PDFInfo
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- CN213448072U CN213448072U CN202022197019.3U CN202022197019U CN213448072U CN 213448072 U CN213448072 U CN 213448072U CN 202022197019 U CN202022197019 U CN 202022197019U CN 213448072 U CN213448072 U CN 213448072U
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- 230000000694 effects Effects 0.000 claims abstract description 16
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- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000010030 laminating Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Abstract
The utility model belongs to the technical field of road and bridge, in particular to a road and bridge telescopic noise reduction device, which comprises a bridge, a telescopic mechanism, noise reduction parts and a connecting bottom plate, wherein the two ends of the inner side of the bridge are movably connected with the telescopic mechanism, the two sides of the inner part of the bridge are connected with fixing bolts in a penetrating way, the bottom end of the bridge is movably connected with the connecting bottom plate, the two sides of the telescopic mechanism are movably connected with side fixing plates, the middle part of the inner side of the bridge is fixedly connected with the noise reduction parts, the noise reduction parts can reduce or eliminate the noise generated when the bridge is telescopic or a vehicle passes through the bridge, the noise reduction sponge plates and the rubber plates isolate the bridge, the noise generated by collision when the bridge is telescopic is avoided, and the energy lost by the transmission of different media and the increased sound when the sound is transmitted, the, the noise reduction function and the purpose are achieved, and the noise reduction function and the noise reduction effect of the device are effectively improved.
Description
Technical Field
The utility model belongs to the technical field of road and bridge, specifically be a flexible device of making an uproar that falls of road and bridge.
Background
A road bridge is composed of the linear structure built up by soil or stone, the road foundation including basic road body, side slopes, side ditches and other auxiliary facilities, the road bridge made of various building materials or mixture and used for car running, and the high-grade highway with high speed, comfort, safety and economy, the telescopic device applied to urban viaduct beams at home and abroad usually has two types, namely a type steel mold number type and a tooth-shaped plate type.
The telescopic noise reduction device for the existing road and bridge is low in practicability and poor in noise reduction effect, noise generated when the bridge is telescopic and collides with the telescopic noise reduction device and noise generated when a vehicle passes through the bridge cannot be weakened or eliminated, the telescopic noise reduction device for the existing road and bridge is not provided with a telescopic damping part, the amplitude of telescopic movement of the bridge cannot be reduced when the bridge is telescopic, the service life of the device and the bridge is influenced, the device is not perfect, and the social requirement cannot be met.
Therefore, how to design a road and bridge telescopic noise reduction device becomes a problem which needs to be solved currently.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a device of making an uproar falls in road and bridge is flexible to it is low to provide the practicality in solving above-mentioned background art, the not good problem of noise reduction effect.
In order to achieve the above object, the utility model provides a following technical scheme: a road and bridge telescopic noise reduction device comprises a bridge, a telescopic mechanism, noise reduction parts and a connecting bottom plate, wherein the inner two ends of the bridge are movably connected with the telescopic mechanism, the inner middle part of the bridge is fixedly connected with the noise reduction parts, the inner two sides of the bridge are connected with fixing bolts in a penetrating way, the bottom end of the bridge is movably connected with the connecting bottom plate, the two sides of the telescopic mechanism are movably connected with side fixing plates, the middle part of the telescopic mechanism is movably connected with a middle movable plate, the two sides of the bottom of the telescopic mechanism are movably connected with telescopic components, the middle part of the top of each side fixing plate is embedded and connected with a telescopic connecting hole, the inner wall of the inner top of each side fixing plate is embedded and connected with a telescopic movable groove, the middle position of the top of each middle movable plate is, one side of the telescopic member is movably connected with a telescopic block, the middle part of the other side of the telescopic member is movably connected with a telescopic ring, the top and the bottom of the middle of the other end of the telescopic block are tightly attached and connected with an outer telescopic spring post, the middle part of the noise reduction component is embedded and connected with a connecting plate, two sides of the bottom of the connecting plate are tightly attached and connected with noise reduction sponge plates, the top of the noise reduction part is connected with an outer side fixing plate in an embedded manner, two sides of the top end of the outer side fixing plate are connected with side connecting holes in an embedded manner, the inner side of the bottom end of the outer side fixing plate is embedded and connected with a bottom end fixing groove, two sides of the connecting bottom plate are movably connected with a side bottom plate, the middle part of the connecting bottom plate is movably connected with an inner side bottom plate, two ends of the inner side bottom plate are fixedly connected with side movable pins, and the middle part of the top end of the side bottom plate is connected with a bottom plate connecting hole in an embedded mode.
Preferably, one end of the telescopic ring is fixedly connected with an inner telescopic spring column.
Preferably, the two ends of the bottom of the connecting plate are tightly attached and connected with rubber plates.
Preferably, the middle part of the inner side of the side bottom plate is embedded and connected with a side movable groove.
Preferably, the number of the telescopic mechanisms is one, the telescopic mechanisms are arranged at the two ends of the middle of the inner side of the bridge, and the telescopic mechanisms are movably connected with the bridge.
Preferably, the noise reduction part is arranged at the middle part of the inner side of the bridge, and the noise reduction part is fixedly connected with the bridge.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the device of making an uproar falls in the flexible of road bridge, telescopic machanism set up both ends in the middle of the inboard of bridge, telescopic machanism and bridge swing joint, and telescopic machanism can be connected between the bridge and satisfy the bridge flexible and deformation, and can also cushion the power that makes the flexible deformation of bridge, the effectual practicality that improves the device use.
2. The road and bridge telescopic noise reduction device comprises a noise reduction part, wherein the noise reduction part is arranged in the middle of the inner side of a bridge and is fixedly connected with the bridge, noise generated when the bridge is telescopic or a vehicle passes through the bridge can be reduced or eliminated by the noise reduction part so as to achieve the noise reduction effect and the noise reduction effect, and the noise reduction effect of the device are effectively improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic structural view of the telescopic mechanism of the present invention;
FIG. 3 is a schematic structural view of the telescopic member of the present invention;
fig. 4 is a schematic structural view of the noise reduction part of the present invention;
fig. 5 is a schematic view of the structure of the connection bottom plate of the present invention.
In the figure: 1. a bridge; 2. a telescoping mechanism; 3. a noise reduction component; 4. connecting the bottom plate; 5. fixing the bolt; 6. a side fixing plate; 7. a middle movable plate; 8. a telescoping member; 9. a middle connecting groove; 10. a flexible movable groove; 11. a telescopic movable block; 12. a telescopic connecting hole; 13. a telescopic block; 14. a telescopic ring; 15. an outer telescopic spring post; 16. an inner side telescopic spring column; 17. a connecting plate; 18. an outer fixing plate; 19. a bottom end fixing groove; 20. connecting holes on the side surface; 21. a noise reduction sponge plate; 22. a rubber plate; 23. a side floor; 24. a bottom plate connection hole; 25. an inside bottom plate; 26. a side movable groove; 27. and a side movable pin.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.
In a first embodiment, please refer to fig. 1-5, the present invention provides a technical solution: a road and bridge telescopic noise reduction device comprises a bridge 1, a telescopic mechanism 2, noise reduction parts 3 and a connecting bottom plate 4, wherein the two ends of the inner side of the bridge 1 are movably connected with the telescopic mechanism 2, the middle part of the inner side of the bridge 1 is fixedly connected with the noise reduction parts 3, the two sides of the inner part of the bridge 1 are connected with fixing bolts 5 in a penetrating way, the bottom end of the bridge 1 is movably connected with the connecting bottom plate 4, the two sides of the telescopic mechanism 2 are movably connected with side fixing plates 6, the middle part of the telescopic mechanism 2 is movably connected with a middle movable plate 7, the two sides of the bottom of the telescopic mechanism 2 are movably connected with telescopic components 8, the middle part of the top of the side fixing plate 6 is embedded and connected with a telescopic connecting hole 12, the inner wall of the inner side of the top of the side fixing plate 6 is embedded and connected with, one side swing joint of flexible component 8 has flexible piece 13, the opposite side middle part swing joint of flexible component 8 has flexible ring 14, top and bottom closely laminating in the middle of the other end of flexible piece 13 are connected with outside telescopic spring post 15, the middle part embedding of the part of making an uproar 3 is connected with connecting plate 17, the bottom both sides of connecting plate 17 closely laminating is connected with the sponge board 21 of making an uproar, the top nested connection of the part of making an uproar 3 has outside fixed plate 18, the top both sides embedding of outside fixed plate 18 is connected with side connecting hole 20, the inboard embedding in bottom of outside fixed plate 18 is connected with bottom fixed slot 19, the both sides swing joint of connecting bottom plate 4 has side bottom plate 23, the middle part swing joint of connecting bottom plate 4 has inboard bottom plate 25, the both ends fixedly connected with side loose pin 27 of inboard bottom plate 25.
Preferably, the inboard extension spring post 16 of one end fixedly connected with of expansion ring 14, expansion ring 14 is connected with flexible piece 13, and expansion ring 14 all sets up in telescopic member 8 with flexible piece 13, when expansion ring 14 contracts, the one end of expansion ring 14 will contact with telescopic member 8's one end, the inside of inboard extension spring post 16 is provided with the spring, the outside is rubber wrap, inboard extension spring post 16 can cushion telescopic ring 14's holding power, avoid the direct one end that strikes telescopic member 8 of expansion ring 14, the effect of protection has been played.
Preferably, the bottom both ends of connecting plate 17 are closely laminated and are connected with rubber slab 22, the bottom of connecting plate 17 can be from last to embedding in the middle spread groove 9 that middle fly leaf 7 set up down, thereby make the inboard contact in bottom of rubber slab 22 and middle fly leaf 7, rubber slab 22 can wrap up the sponge board 21 of making an uproar that falls that sets up on connecting plate 17, avoid making the sponge board 21 of making an uproar damaged because of the friction when embedding the bottom of connecting plate 17 in the middle spread groove 9, prevent to fall the sponge board 21 of making an uproar and damage.
Preferably, the middle part of the inner side of the side bottom plate 23 is embedded and connected with a side movable groove 26, the side bottom plate 23 is connected with the inner side bottom plate 25 on the connecting bottom plate 4 through a side movable pin 27, when the connecting bottom plate 4 is stretched, the two side bottom plates 23 move outwards, the side movable pin 27 can move in the side movable groove 26, the connecting bottom plate 4 is prevented from being damaged due to the stretching force, and the connecting bottom plate 4 can be used normally.
Preferably, the telescopic mechanism 2 is provided with one, the telescopic mechanism 2 is arranged at the middle two ends of the inner side of the bridge 1, the telescopic mechanism 2 is movably connected with the bridge 1, the telescopic mechanism 2 can connect the bridges 1 and meet the expansion and deformation of the bridge, and can also buffer the force for expanding and contracting the bridge 1, the telescopic mechanism 2 is provided with two side fixing plates 6 and a middle movable plate 7, a telescopic member 8 is arranged between the bottom of the side fixing plate 6 and the bottom of the middle movable plate 7, a telescopic block 13 on the telescopic member 8 is movably connected with a telescopic ring 14, the telescopic block 13 is connected with an outer telescopic spring post 15, the telescopic ring 14 is connected with an inner telescopic spring post 16, a telescopic movable block 11 on the middle movable plate 7 can be embedded into a telescopic movable groove 10 on the side fixing plate 6, when the telescopic mechanism 2 is installed, the two side fixing plates 6 arranged on the telescopic mechanism 2 are respectively attached between the two bridges 1, through the flexible connecting hole 12 of 5 embedding side fixed plate 6 settings of fixing bolt and run through bridge 1, then in the bottom plate connecting hole 24 that 5 embedding connecting bottom plate 4 settings of fixing bolt that will run through bridge 1 set up, and it is fixed to screw up through the screw thread with the nut, when flexible rocking between bridge 1, flexible movable block 11 can be at the activity of flexible movable groove 10, in the time of flexible piece 13 and the activity of telescopic ring 14 simultaneously, support and the shock attenuation through outside extension spring post 15 and inboard extension spring post 16, satisfy the flexible power that will make bridge 1 flexible between bridge 1 and cushion, the effectual practicality that improves the device use.
Preferably, one noise reduction part 3 is arranged, the noise reduction part 3 is arranged at the middle part of the inner side of the bridge 1, the noise reduction part 3 is fixedly connected with the bridge 1, the noise reduction part 3 can reduce or eliminate the noise generated when the bridge stretches or the vehicle passes through the bridge 1, the noise reduction part 3 is provided with an outer side fixing plate 18 made of rubber and a T-shaped connecting plate 17, the connecting plate 17 is embedded into the outer side fixing plate 18, the connecting plate 17 is connected with two noise reduction sponge plates 21 and two rubber plates 22, the outer side fixing plate 18 is provided with a side connecting hole 20 and a bottom fixing groove 19, when the noise reduction part 3 is installed, the bottom of the connecting plate 17 is embedded into a middle connecting groove 9 arranged on a middle movable plate 7 on the installed telescopic mechanism 2, the bottom end of the connecting plate 17 is contacted with the installed connecting bottom plate 4 and supports the connecting plate 17 through the connecting bottom plate 4, simultaneously, bottom fixed slot 19 is laminated and is wrapped up the telescopic machanism 2 of installing, when embedding fixing bolt 5 in bridge 1, imbed fixing bolt 5 from side connecting hole 20, the top of connecting plate 17 and the top of outside fixed plate 18 let the top of falling the part of making an uproar 3 form an arc, when the vehicle passes through the top of bridge 1 with the device, the production of noise reduction, fall and make an uproar sponge board 21 and rubber slab 22 and isolate between bridge 1, collision noise generation when avoiding bridge 1 to stretch out and draw back, and through the medium that changes the sound conduction and the energy that the increase sound lost in different medium conduction, the conduction of noise generation when contact collision between the separation device component, in order to reach the effect and the purpose of making an uproar of falling, the effectual noise reduction and the effect that has improved the device.
The working principle is as follows: firstly, whether the inner telescopic spring column 16 is damaged or not is checked, one end of the telescopic ring 14 is fixedly connected with the inner telescopic spring column 16, the telescopic ring 14 is connected with the telescopic block 13, the telescopic ring 14 and the telescopic block 13 are both arranged in the telescopic member 8, when the telescopic ring 14 contracts, one end of the telescopic ring 14 is in contact with one end of the telescopic member 8, a spring is arranged inside the inner telescopic spring column 16, the outer side of the inner telescopic spring column is wrapped by rubber, the inner telescopic spring column 16 can buffer the supporting force of the telescopic ring 14, the telescopic ring 14 is prevented from directly impacting one end of the telescopic member 8, and the protection effect is achieved;
then, whether the rubber plate 22 is damaged or not is checked, the rubber plate 22 is closely attached to two ends of the bottom of the connecting plate 17, the bottom of the connecting plate 17 can be embedded into the middle connecting groove 9 formed in the middle movable plate 7 from top to bottom, so that the rubber plate 22 is in contact with the inner side of the bottom of the middle movable plate 7, the rubber plate 22 can wrap the noise reduction sponge plate 21 arranged on the connecting plate 17, the noise reduction sponge plate 21 is prevented from being damaged due to friction when the bottom of the connecting plate 17 is embedded into the middle connecting groove 9, and the noise reduction sponge plate 21 is prevented from being damaged;
then, whether the side bottom plates 23 can be normally used is checked, the middle parts of the inner sides of the side bottom plates 23 are embedded and connected with side movable grooves 26, the side bottom plates 23 are connected with the inner side bottom plates 25 on the connecting bottom plate 4 through side movable pins 27, when the connecting bottom plate 4 is stretched, the two side bottom plates 23 move outwards, the side movable pins 27 can move in the side movable grooves 26, the connecting bottom plate 4 is prevented from being damaged due to the stretching force, and the connecting bottom plate 4 can be normally used;
then, the telescopic mechanism 2 is installed, one telescopic mechanism 2 is arranged, the telescopic mechanisms 2 are arranged at the middle two ends of the inner side of the bridge 1, the telescopic mechanisms 2 are movably connected with the bridge 1, the telescopic mechanisms 2 can connect the bridges 1 and meet the expansion and deformation of the bridge, and can also buffer the force for expanding and contracting the bridge 1, the telescopic mechanisms 2 are provided with two side fixing plates 6 and a middle movable plate 7, a telescopic member 8 is arranged between the side fixing plates 6 and the bottom of the middle movable plate 7, a telescopic block 13 on the telescopic member 8 is movably connected with a telescopic ring 14, the telescopic block 13 is connected with an outer telescopic spring column 15, the telescopic ring 14 is connected with an inner telescopic spring column 16, a telescopic movable block 11 on the middle movable plate 7 can be embedded into a telescopic movable groove 10 on the side fixing plate 6, when the telescopic mechanisms 2 are installed, two side fixing plates 6 arranged on a telescopic mechanism 2 are respectively attached between two bridges 1, are embedded into telescopic connecting holes 12 arranged on the side fixing plates 6 through fixing bolts 5 and penetrate through the bridges 1, then the fixing bolts 5 penetrating through the bridges 1 are embedded into bottom plate connecting holes 24 arranged on a connecting bottom plate 4 and are screwed and fixed through nuts, when the bridges 1 are stretched and shaken, telescopic movable blocks 11 can move in telescopic movable grooves 10, and when a telescopic block 13 and a telescopic ring 14 move, the telescopic movable blocks are supported and damped through an outer telescopic spring column 15 and an inner telescopic spring column 16, so that the stretching between the bridges 1 is met, the force for stretching the bridges 1 is buffered, and the practicability of the device is effectively improved;
finally, the noise reduction part 3 is installed, one noise reduction part 3 is arranged, the noise reduction part 3 is arranged at the middle part of the inner side of the bridge 1, the noise reduction part 3 is fixedly connected with the bridge 1, the noise reduction part 3 can reduce or eliminate the noise generated when the bridge stretches or the vehicle passes through the bridge 1, the noise reduction part 3 is provided with an outer side fixing plate 18 made of rubber and a T-shaped connecting plate 17, the connecting plate 17 is embedded into the outer side fixing plate 18, the connecting plate 17 is connected with two noise reduction sponge plates 21 and two rubber plates 22, the outer side fixing plate 18 is provided with a side connecting hole 20 and a bottom fixing groove 19, when the noise reduction part 3 is installed, the bottom of the connecting plate 17 is embedded into a middle connecting groove 9 arranged on a middle movable plate 7 on the installed telescopic mechanism 2, the bottom end of the connecting plate 17 is contacted with the installed connecting bottom plate 4 and supports the connecting plate 17 through the connecting, meanwhile, the bottom end fixing groove 19 is attached to and wraps the installed telescopic mechanism 2, when the fixing bolt 5 is embedded into the bridge 1, the fixing bolt 5 is embedded into the side connecting hole 20, the top of the connecting plate 17 and the top of the outer side fixing plate 18 enable the top of the noise reduction component 3 to form an arc shape, when a vehicle passes through the top ends of the bridge 1 and the device, the noise is reduced, the noise reduction sponge plate 21 and the rubber plate 22 isolate the bridge 1 from each other, the noise caused by collision when the bridge 1 stretches is avoided, and by changing the medium of sound transmission and increasing the energy loss of sound transmission in different media, the noise transmission generated during the contact collision between the device components is obstructed, in order to reach the effect and the purpose of making an uproar of falling, the effectual effect and the effect of making an uproar of falling that has improved the device, this is exactly this road and bridge device of making an uproar's theory of operation that falls that stretches out and draws back.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments 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 device of making an uproar falls in flexible of road and bridge, includes bridge (1), telescopic machanism (2), falls the part of making an uproar (3) and connects bottom plate (4), its characterized in that: the noise reduction device is characterized in that telescopic mechanisms (2) are movably connected to two inner sides of the bridge (1), noise reduction parts (3) are fixedly connected to the middle of the inner side of the bridge (1), fixing bolts (5) are connected to two inner sides of the bridge (1) in a penetrating manner, a connecting bottom plate (4) is movably connected to the bottom of the bridge (1), side fixing plates (6) are movably connected to two sides of the telescopic mechanisms (2), middle movable plates (7) are movably connected to the middle of the telescopic mechanisms (2), telescopic members (8) are movably connected to two sides of the bottom of the telescopic mechanisms (2), telescopic connecting holes (12) are connected to the middle of the top of the side fixing plates (6) in an embedded manner, telescopic movable grooves (10) are connected to the inner wall of the inner side of the top of the side fixing plates (6), and middle connecting grooves (9), the flexible movable block (11) of top both ends fixedly connected with of middle fly leaf (7), one side swing joint of flexible component (8) has flexible piece (13), the opposite side middle part swing joint of flexible component (8) has telescopic ring (14), top and the bottom is closely laminated and is connected with outside extension spring post (15) in the middle of the other end of flexible piece (13), the middle part embedding of the part of making an uproar (3) of falling is connected with connecting plate (17), the bottom both sides of connecting plate (17) are closely laminated and are connected with the sponge board of making an uproar (21) of falling.
2. The telescopic noise reduction device for road and bridge according to claim 1, wherein: the top nested connection of making an uproar part (3) falls has outside fixed plate (18), the top both sides embedding of outside fixed plate (18) is connected with side connecting hole (20), the inboard embedding in bottom of outside fixed plate (18) is connected with bottom fixed slot (19), the both sides swing joint of connecting bottom plate (4) has side bottom plate (23), the middle part swing joint of connecting bottom plate (4) has inboard bottom plate (25), the both ends fixedly connected with side activity round pin (27) of inboard bottom plate (25), the top middle part embedding of side bottom plate (23) is connected with bottom plate connecting hole (24).
3. The telescopic noise reduction device for road and bridge according to claim 1, wherein: one end of the telescopic ring (14) is fixedly connected with an inner telescopic spring column (16).
4. The telescopic noise reduction device for road and bridge according to claim 1, wherein: the two ends of the bottom of the connecting plate (17) are tightly attached and connected with rubber plates (22).
5. The telescopic noise reduction device for road and bridge according to claim 2, wherein: the middle part of the inner side of the side bottom plate (23) is embedded and connected with a side movable groove (26).
6. The telescopic noise reduction device for road and bridge according to claim 1, wherein: the telescopic mechanism (2) is provided with one, the telescopic mechanism (2) is arranged at the middle two ends of the inner side of the bridge (1), and the telescopic mechanism (2) is movably connected with the bridge (1).
7. The telescopic noise reduction device for road and bridge according to claim 1, wherein: the noise reduction component (3) is arranged one, the noise reduction component (3) is arranged in the middle of the inner side of the bridge (1), and the noise reduction component (3) is fixedly connected with the bridge (1).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN202022197019.3U CN213448072U (en) | 2020-09-29 | 2020-09-29 | Telescopic noise reduction device for road and bridge |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN202022197019.3U CN213448072U (en) | 2020-09-29 | 2020-09-29 | Telescopic noise reduction device for road and bridge |
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CN213448072U true CN213448072U (en) | 2021-06-15 |
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CN202022197019.3U Expired - Fee Related CN213448072U (en) | 2020-09-29 | 2020-09-29 | Telescopic noise reduction device for road and bridge |
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CN (1) | CN213448072U (en) |
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2020
- 2020-09-29 CN CN202022197019.3U patent/CN213448072U/en not_active Expired - Fee Related
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Granted publication date: 20210615 |