CN110017893A - A kind of noise survey device - Google Patents
A kind of noise survey device Download PDFInfo
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- CN110017893A CN110017893A CN201910394413.5A CN201910394413A CN110017893A CN 110017893 A CN110017893 A CN 110017893A CN 201910394413 A CN201910394413 A CN 201910394413A CN 110017893 A CN110017893 A CN 110017893A
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- main box
- noise
- workbench
- measurement case
- box
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of noise survey devices, including elevating mechanism, workbench, storage measurement case, noise measuring set, wind gauge and battery；The workbench is set on elevating mechanism, and height can be adjusted by elevating mechanism；The storage measurement case is set on workbench；The storage measurement case includes main box and auxiliary box body；The noise measuring set and wind gauge are movably arranged in main box and auxiliary box body respectively；The battery is that noise measuring set and wind gauge are powered.Structure of the invention is ingenious, it is adjusted by height of the elevating mechanism to workbench, it can satisfy the noise-measuring demand of different height, the holding noise measuring set and wind gauge that noise measuring set and wind gauge can be safe and reliable are installed by storage measurement case, avoid instrument impaired, it is extremely easy to use.
Description
Technical field
The present invention relates to a kind of noise measuring device fields, and in particular to a kind of noise survey device.
Background technique
Each noise like is inevitably encountered in life, it can hamper people normally rest, study and work.Mesh
Before, it is all then to be placed with psophometer on its top by a simple lift rack that roadside noise measuring device is most of,
People are helped to measure in this way, so that people are measured back and forth without holding measuring instrument with hand for a long time, but existing survey
Device is measured there are some disadvantages, noise measuring device first is chronically exposed to outer, the serious shadow of the factors such as humidity, dust in environment
The service life of psophometer is rung, and reaches three-level or more in wind-force, or during the broiling summer when the temperature is excessively high, seriously
The use of psophometer is influenced, and this type of information can not be provided in existing psophometer for survey crew, causes to measure
The measurement result of personnel record's inaccuracy.
Summary of the invention
The object of the present invention is to provide a kind of easy to use, noise survey devices with long service life.
Realizing the technical solution of the object of the invention is: a kind of noise survey device, including elevating mechanism, work are put down
Platform, storage measurement case, noise measuring set, wind gauge and battery；The workbench is set on elevating mechanism, and high
Degree can be adjusted by elevating mechanism；The storage measurement case is set on workbench；Storage measurement case include main box and
Auxiliary box body；The noise measuring set and wind gauge are movably arranged in main box and auxiliary box body respectively；The battery is
Noise measuring set and wind gauge power supply.
The elevating mechanism includes pedestal, jacking sleeve, elevating lever and clamping screw；The jacking sleeve is set to pedestal
On；The elevating lever is slidably connected with jacking sleeve, and the top of elevating lever is connect with workbench；The jacking sleeve
Side wall is equipped with the inside and outside screw hole of connection；The clamping screw is threadedly coupled with the screw hole of jacking sleeve.
The workbench includes parent plate, rotating platform and positioning bolt；Described matrix plate is connect with elevating mechanism；Institute
Rotating platform is stated to be rotatably connected on the top surface of parent plate；The rotating platform, which is equipped with, runs through upper and lower screw hole；The positioning
Bolt is threadedly coupled with the screw hole of rotating platform；The main box of the storage measurement case is fixed on the rotating platform.
It further include temperature meter；The temperature meter is set on the parent plate of workbench.
The top surface of the main box of the storage measurement case is equipped with the inside and outside strip groove of connection；Rotation is equipped in the main box
Turn component；The rotary components include mounting plate, rotating handles and fixing bolt；The mounting plate be set to strip groove just under
Side；The mounting plate is equipped with the shaft being rotatablely connected with main tank body sidewall；The noise measuring set is fixed on the side of mounting plate
On face, and the sum of thickness of noise measuring set and mounting plate is not more than the thickness of strip groove；One end of the shaft is through master
The side wall of cabinet extends to the outside of main box；The rotating handles are fixed on the end that shaft is located on the outside of main box；Institute
Rotating handles are stated equipped with screw hole；The fixing bolt is threadedly coupled with the screw hole of rotating handles, and outside end and main box
Wall cooperation.
The two sides of the bar slot of the main box of the storage measurement case are equipped with baffle；The baffle is in semicircle shape.
The end of the mounting plate of the rotary components of the storage measurement case is equipped with the transverse slat that thickness is greater than bar shaped slot thickness.
The main box of the storage measurement case is equipped with moisture-proof component；The moisture-proof component includes drying box, chock plug and drying
Agent；The side wall of the main box is equipped with opening；The drying box is set on the inner wall at main box opening position, and drying box
Inner cavity and main box open communication；Plurality of through holes is evenly equipped on the drying box；The chock plug is set to opening for main box
In mouthful, and seal the opening of main box；The desiccant is set in dry box cavity.
Sliding sleeve, sliding bar and connection bolt are equipped in the auxiliary box body of the storage measurement case；The sliding sleeve is set
In on cabinet wall；The sliding bar is slidably connected with sliding sleeve, and end is connect with wind gauge；The sliding sleeve
Cylinder side wall, which is equipped with, runs through inside and outside screw hole；The connection bolt is threadedly coupled with sliding sleeve；The two sides of the auxiliary box body are equal
Equipped with semi-circular recesses.
The main box top edge of the storage measurement case and auxiliary box body are hinged, and auxiliary box body can be by overturning Gai Zhu
On the top of cabinet；The top edge of the main box is equipped with location hole；The auxiliary box body is equipped with can be with location hole cooperation
Positioning pin.
The inner wall of the main box of the storage measurement case is equipped with noise reduction sponge.
The sun-shading mechanism includes sunshading board, pumping rod, flexibility, spring and locating rod；The flexibility is fixed
On the bottom surface of sunshading board；Sliding block is slidably connected in the flexibility inner cavity；The pumping rod and locating rod are each attached to
On workbench, and the top of pumping rod is protruded into flexibility inner cavity and is fixed with sliding block；The spring is fixed on expanding sleeve
In tube inner chamber, and it is located at below sliding block；The bottom surface of the sunshading board is equipped with the locating slot with positioning boom end cooperation.
The photovoltaic panel is set on the sunshade plate top surface of sun-shading mechanism；The sunshading board is storage battery power supply.
Using above-mentioned technical proposal, the present invention has the following beneficial effects: (1) structure of the invention is ingenious, pass through liter
The height of workbench is adjusted in descending mechanism, can satisfy the noise-measuring demand of different height, measures case by storage
Preservation noise measuring set and wind gauge that noise measuring set and wind gauge can be safe and reliable are installed, avoid instrument by
Damage, it is extremely easy to use.
(2) elevating mechanism of the present invention, is bolted, and can adjust the height of workbench according to demand, be suitable for
More working environments, it is extremely easy to use.
(3) rotating platform of workbench of the invention realizes multi-faceted measurement, keeps measurement result more accurate.
(4) present invention is equipped with temperature meter, and survey crew can adjust sunshade according to the temperature that temperature meter is shown
Plate reduces influence of the high temperature to noise measuring set, while recording convenient for survey crew to temperature.
(5) present invention storage measurement case is equipped with rotary components, can be more flexible in measurement, can preferably store and make an uproar
Sound measuring appliance, it is extremely easy to use, and can be realized the multiangular measurement of noise measuring set, measurement result is more accurate.
(6) semicircle shape baffle of the present invention can provide operating space to the greatest extent for storage measurement case, can be from side
Preferably protection noise measuring set avoids instrument impaired.
(7) present invention is equipped with moisture-proof component, and moisture is avoided to lead to noise measuring set moisture damage.
(8) present invention storage measurement case is divided into two parts of main box and auxiliary box body, can be secondary by overturning when unused
Cabinet covers auxiliary box body on main box, can better protection instrument, and plane space can be saved.
(9) present invention storage measurement case is equipped with silencing cotton, absorbs noise, more environmentally-friendly.
(10) present invention is equipped with sun-shading mechanism, can keep the sun off for workbench, prevent measuring instrument sudden and violent because of high temperature
Solarization damages.
Detailed description of the invention
In order that the present invention can be more clearly and readily understood, right below according to specific embodiment and in conjunction with attached drawing
The present invention is described in further detail, wherein
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the structural schematic diagram of storage measurement case of the invention.
Fig. 3 is that the secondary lid of storage measurement case of the invention partly covers the structural schematic diagram on main box.
Fig. 4 is side view of the secondary cover cap of storage measurement case of the invention on main box.
Fig. 5 is the mounting plate of the main box of storage measurement case of the invention and the structural schematic diagram of noise measuring set.
Label in attached drawing are as follows: elevating mechanism 1, pedestal 1-1, jacking sleeve 1-2, elevating lever 1-3, clamping screw 1-4, work
Make platform 2, parent plate 2-1, rotating platform 2-2, bolt 2-3, storage measurement case 3, main box 3-1, strip groove 3-1-1, installation
Plate 3-1-2, transverse slat 3-1-2-1, rotating handles 3-1-3, fixing bolt 3-1-4, shaft 3-1-5, baffle 3-1-6, drying box 3-
1-7, through-hole 3-1-7-1, chock plug 3-1-8, location hole 3-1-9, auxiliary box body 3-2, sliding sleeve 3-2-1, sliding bar 3-2-2, spiral shell
Bolt 3-2-3, semi-circular recesses 3-2-4, positioning pin 3-2-5, noise measuring set 4, wind gauge 5, battery 6, sun-shading mechanism
7, sunshading board 7-1, locating slot 7-1-1, pumping rod 7-2, flexibility 7-3, sliding block 7-3-1, spring 7-4, locating rod 7-5, light
Lie prostrate plate 8, temperature meter 9.
Specific embodiment
(embodiment 1)
See Fig. 1 to Fig. 5, the present embodiment 1, a kind of noise survey device, including elevating mechanism 1, workbench 2,
Storage measurement case 3, noise measuring set 4, wind gauge 5 and battery 6.The workbench 2 is set on elevating mechanism 1, and
And height can be adjusted by elevating mechanism 1.The storage measurement case 3 is set on workbench.The storage measurement case 3 includes master
Cabinet 3-1 and auxiliary box body 3-2.The noise measuring set 4 and wind gauge 5 are movably arranged on main box 3-1 and odd-side respectively
In body 3-2.The battery 6 is that noise measuring set 4 and wind gauge 5 are powered.
Elevating mechanism 1 includes pedestal 1-1, jacking sleeve 1-2, elevating lever 1-3 and clamping screw 1-4.The jacking sleeve
1-2 is set on pedestal 1-1.The elevating lever 1-3 and jacking sleeve 1-2 is slidably connected, and the top of elevating lever 1-3 and work
Platform 2 connects.The side wall of the jacking sleeve 1-2 is equipped with the inside and outside screw hole of connection.The clamping screw 1-4 and jacking sleeve
The screw hole of 1-2 is threadedly coupled.
The workbench 2 includes parent plate 2-1, rotating platform 2-2 and positioning bolt 2-3.Described matrix plate 2-1 and liter
Descending mechanism 1 connects.The rotating platform 2-2 is rotatably connected on the top surface of parent plate 2-1.The rotating platform 2-2 is equipped with
Through upper and lower screw hole.The positioning bolt 2-3 is threadedly coupled with the screw hole of rotating platform 2-2.The master of the storage measurement case 3
Cabinet 3-1 is fixed on rotating platform 2-2.
It further include temperature meter 9.The temperature meter 9 is set on the parent plate 2-1 of workbench 2.
The top surface of the main box 3-1 of storage measurement case 3 is equipped with the inside and outside strip groove 3-1-1 of connection.It is set in main box 3-1
There are rotary components.Rotary components include mounting plate 3-1-2, rotating handles 3-1-3 and fixing bolt 3-1-4.Mounting plate 3-1-2 is set
In the underface of strip groove 3-1-1.Mounting plate 3-1-2 is equipped with the shaft 3-1-5 being rotatablely connected with main box 3-1 side wall.It makes an uproar
Sound measuring appliance 4 is fixed on the side of mounting plate 3-1-2, and the sum of thickness of noise measuring set 4 and mounting plate 3-1-2 is little
In the thickness of strip groove 3-1-1.One end of shaft 3-1-5 extends to the outside of main box 3-1 through the side wall of main box 3-1.
Rotating handles 3-1-3 is fixed on the end that shaft 3-1-5 is located on the outside of main box 3-1.Rotating handles 3-1-3 is equipped with spiral shell
Hole.Fixing bolt 3-1-4 is threadedly coupled with the screw hole of rotating handles 3-1-3, and end and main box 3-1 outer wall cooperate.
The two sides of the bar slot 3-1-1 of the main box 3-1 of the storage measurement case 3 are equipped with baffle 3-1-6.The baffle
3-1-6 is in semicircle shape.
The end of the mounting plate 3-1-2 of the rotary components of the storage measurement case 3 is equipped with thickness and is greater than strip groove 3-1-1
The transverse slat 3-1-2-1 of thickness.
The main box 3-1 of the storage measurement case 3 is equipped with moisture-proof component.The moisture-proof component includes drying box 3-1-7, plug
Head 3-1-8 and desiccant.The side wall of the main box 3-1 is equipped with opening.The drying box 3-1-7 is set to main box 3-1 and opens
On the inner wall of oral area position, and the open communication of the inner cavity of drying box 3-1-7 and main box 3-1.It is equal on the drying box 3-1-7
It is furnished with plurality of through holes 3-1-7-1.The chock plug 3-1-8 seals main box 3-1's in the opening of main box 3-1
Opening.The desiccant is set in the inner cavity drying box 3-1-7.
Sliding sleeve 3-2-1, sliding bar 3-2-2 and connection bolt 3- are equipped in the auxiliary box body 3-2 of the storage measurement case 3
2-3.The sliding sleeve 3-2-1 is set on cabinet 3-2 inner wall.The sliding bar 3-2-2 and sliding sleeve 3-2-1 sliding connects
It connects, and end is connect with wind gauge 5.The sliding sleeve 3-2-1 side wall, which is equipped with, runs through inside and outside screw hole.The company
Connecting bolt 3-2-3 is threadedly coupled with sliding sleeve 3-2-1.The two sides of the auxiliary box body 3-2 are equipped with semi-circular recesses 3-2-4.
The top edge main box 3-1 of the storage measurement case 3 and auxiliary box body 3-2 are hinged, and auxiliary box body 3-2 can pass through
Overturning is covered on the top in main box 3-1.The top edge of the main box 3-1 is equipped with location hole 3-1-9.The auxiliary box body 3-
2 are equipped with the positioning pin 3-2-5 that can cooperate with location hole 3-1-9.
The inner wall of the main box 3-1 of the storage measurement case 3 is equipped with noise reduction sponge.
It further include sun-shading mechanism 7.The sun-shading mechanism 7 includes sunshading board 7-1, pumping rod 7-2, flexibility 7-3, spring
7-4 and locating rod 7-5.The flexibility 7-3 is fixed on the bottom surface of sunshading board 7-1.It is sliding in the inner cavity the flexibility 7-3
It is dynamic to be connected with sliding block 7-3-1.The pumping rod 7-2 and locating rod 7-5 are each attached on workbench 2, and pumping rod 7-2
Top is protruded into the inner cavity flexibility 7-3 and is fixed with sliding block 7-3-1.The spring 7-4 is fixed in the inner cavity flexibility 7-3,
And it is located at below sliding block 7-3-1.The bottom surface of the sunshading board 7-1 is equipped with the locating slot 7- cooperated with the end locating rod 7-5
1-1。
It further include photovoltaic panel 8.The photovoltaic panel 8 is set on the top surface sunshading board 7-1 of sun-shading mechanism 7.The sunshading board 7-1
For the power supply of battery 6.
In use, the present apparatus is placed on working region, the present apparatus consolidate into 1-1 calmly on the ground by pedestal, pass through to
The upper elevating lever 1-3 promoted in jacking sleeve 1-2, is then fixed by clamping screw 1-4, so that the present apparatus can
The measurement that noise data is carried out in effective height, needs to need according to the actual situation at this time, pulls up sunshading board 7-1, because
To be provided with pumping rod 7-2 in flexibility 7-3, while pulling sunshading board 7-1 in this way, because pumping rod 7-2 is motionless, institute
Band movable slider 7-3-1 compressed spring 7-4 is stated, is then rotated, so that it is no longer sheltered from noise measuring set 4, can be good at
Surrounding noise data is collected, auxiliary box body 3-2 is overturn, by rotating the rotating handles 3-1-3 of main box 3-1, makes to install
Plate 3-1-2, which is overturn to noise measuring set 4, stretches out main box 3-1, carries out noise-measuring, rotation rotation handle by noise measuring set 4
After hand 3-1-3 to suitable angle, by the fixing bolt 3-1-4 on rotating handles 3-1-3 to present rotating handles 3-1-3 into
Row is fixed, if measurement direction needs to adjust, rotates rotating platform 2-2, then passes through 2-3 pairs of bolt on rotating platform 2-2
Rotating platform 2-2 is fixed, and guarantees the stability and accuracy of measurement in this way.
The present apparatus over time, measures ambient noise, and survey crew's compartment time carries out data record,
This sample device can complete work well, and in this way when hot weather, rotating sun-shading board 7-1 can survey for noise
Measuring device 4 keeps the sun off, and prevents the damage of noise measuring set 4, is provided with drying box 3-1-7, drying box 3- in storage measurement case 3
It is filled with desiccant in 1-7, prevents rainy weather in this way, causes the dampness of noise measuring set 4 to cause to damage, passes through chock plug 3-1-8
What be can be convenient replace, and in the fall windy weather when, wind speed can be measured by wind gauge 5, convenient for survey
Amount personnel record wind speed.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of noise survey device, it is characterised in that: including elevating mechanism (1), workbench (2), storage measurement case
(3), noise measuring set (4), wind gauge (5) and battery (6)；The workbench (2) is set on elevating mechanism (1),
And height can be adjusted by elevating mechanism (1)；Storage measurement case (3) is set on workbench；The storage measures case
It (3) include main box (3-1) and auxiliary box body (3-2)；The noise measuring set (4) and wind gauge (5) activity setting respectively
In main box (3-1) and auxiliary box body (3-2)；The battery (6) is noise measuring set (4) and wind gauge (5) is powered.
2. noise survey device according to claim 1, it is characterised in that: the elevating mechanism (1) includes pedestal
(1-1), jacking sleeve (1-2), elevating lever (1-3) and clamping screw (1-4)；The jacking sleeve (1-2) is set to pedestal (1-1)
On；The elevating lever (1-3) is slidably connected with jacking sleeve (1-2), and the top of elevating lever (1-3) and workbench (2)
Connection；The side wall of the jacking sleeve (1-2) is equipped with the inside and outside screw hole of connection；The clamping screw (1-4) and jacking sleeve
The screw hole of (1-2) is threadedly coupled.
3. noise survey device according to claim 1, it is characterised in that: the workbench (2) includes matrix
Plate (2-1), rotating platform (2-2) and positioning bolt (2-3)；Described matrix plate (2-1) is connect with elevating mechanism (1)；The rotation
Turn platform (2-2) to be rotatably connected on the top surface of parent plate (2-1)；The rotating platform (2-2), which is equipped with, runs through upper and lower spiral shell
Hole；The positioning bolt (2-3) is threadedly coupled with the screw hole of rotating platform (2-2)；The main box of storage measurement case (3)
(3-1) is fixed on rotating platform (2-2).
4. noise survey device according to claim 3, it is characterised in that: further include temperature meter (9)；It is described
Temperature meter (9) is set on the parent plate (2-1) of workbench (2).
5. noise survey device according to claim 1, it is characterised in that: the main tank of storage measurement case (3)
The top surface of body (3-1) is equipped with the inside and outside strip groove (3-1-1) of connection；Rotary components are equipped in the main box (3-1)；It is described
Rotary components include mounting plate (3-1-2), rotating handles (3-1-3) and fixing bolt (3-1-4)；The mounting plate (3-1-2)
Set on the underface of strip groove (3-1-1)；The mounting plate (3-1-2) is equipped with and is rotatablely connected with main box (3-1) side wall
Shaft (3-1-5)；The noise measuring set (4) is fixed on the side of mounting plate (3-1-2), and noise measuring set (4) and
The sum of thickness of mounting plate (3-1-2) is not more than the thickness of strip groove (3-1-1)；One end of the shaft (3-1-5) is through master
The side wall of cabinet (3-1) extends to the outside of main box (3-1)；The rotating handles (3-1-3) are fixed on the position shaft (3-1-5)
On end on the outside of main box (3-1)；The rotating handles (3-1-3) are equipped with screw hole；The fixing bolt (3-1-4) with
The screw hole of rotating handles (3-1-3) is threadedly coupled, and end and main box (3-1) outer wall cooperate.
6. noise survey device according to claim 5, it is characterised in that: the main tank of storage measurement case (3)
The two sides of the bar slot (3-1-1) of body (3-1) are equipped with baffle (3-1-6)；The baffle (3-1-6) is in semicircle shape.
7. noise survey device according to claim 1, it is characterised in that: the main tank of storage measurement case (3)
Body (3-1) is equipped with moisture-proof component；The moisture-proof component includes drying box (3-1-7), chock plug (3-1-8) and desiccant；The master
The side wall of cabinet (3-1) is equipped with opening；The drying box (3-1-7) is set on the inner wall at main box (3-1) opening position, and
And the open communication of the inner cavity of drying box (3-1-7) and main box (3-1)；It is evenly equipped on the drying box (3-1-7) a plurality of
Through-hole (3-1-7-1)；The chock plug (3-1-8) seals opening for main box (3-1) in the opening of main box (3-1)
Mouthful；The desiccant is set in the inner cavity drying box (3-1-7).
8. noise survey device according to claim 1, it is characterised in that: the odd-side of storage measurement case (3)
Sliding sleeve (3-2-1), sliding bar (3-2-2) and connection bolt (3-2-3) are equipped in body (3-2)；Sliding sleeve (the 3-2-
1) it is set on cabinet (3-2) inner wall；The sliding bar (3-2-2) is slidably connected with sliding sleeve (3-2-1), and end and wind
Force measurement device (5) connection；Sliding sleeve (3-2-1) side wall, which is equipped with, runs through inside and outside screw hole；Connection bolt (the 3-2-
3) it is threadedly coupled with sliding sleeve (3-2-1)；The two sides of the auxiliary box body (3-2) are equipped with semi-circular recesses (3-2-4).
9. noise survey device according to claim 1, it is characterised in that: the main tank of storage measurement case (3)
Hingedly, and auxiliary box body (3-2) can be by overturning the top that cover in main box (3-1) by the body top edge (3-1) and auxiliary box body (3-2)
In portion；The top edge of the main box (3-1) is equipped with location hole (3-1-9)；The auxiliary box body (3-2) is equipped with can be with positioning
The positioning pin (3-2-5) of hole (3-1-9) cooperation.
10. noise survey device according to claim 1, it is characterised in that: further include sun-shading mechanism (7)；It is described
Sun-shading mechanism (7) includes sunshading board (7-1), pumping rod (7-2), flexibility (7-3), spring (7-4) and locating rod (7-5)；
The flexibility (7-3) is fixed on the bottom surface of sunshading board (7-1)；It is slidably connected in flexibility (7-3) inner cavity
Sliding block (7-3-1)；The pumping rod (7-2) and locating rod (7-5) are each attached on workbench (2), and pumping rod (7-2)
Top protrude into it is fixed with sliding block (7-3-1) in the inner cavity flexibility (7-3)；The spring (7-4) is fixed on flexibility (7-
3) in inner cavity, and it is located at below sliding block (7-3-1)；The bottom surface of the sunshading board (7-1) is equipped with and the end locating rod (7-5)
The locating slot (7-1-1) of cooperation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910394413.5A CN110017893A (en) | 2019-05-13 | 2019-05-13 | A kind of noise survey device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910394413.5A CN110017893A (en) | 2019-05-13 | 2019-05-13 | A kind of noise survey device |
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| CN110017893A true CN110017893A (en) | 2019-07-16 |
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