CN115752710A - Anechoic chamber verification support - Google Patents
Anechoic chamber verification support Download PDFInfo
- Publication number
- CN115752710A CN115752710A CN202211438957.5A CN202211438957A CN115752710A CN 115752710 A CN115752710 A CN 115752710A CN 202211438957 A CN202211438957 A CN 202211438957A CN 115752710 A CN115752710 A CN 115752710A
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- rack
- frame
- base
- automatically controlled
- telescopic link
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- 238000012795 verification Methods 0.000 title claims description 21
- 238000001514 detection method Methods 0.000 claims description 21
- 238000003556 assay Methods 0.000 claims 1
- 230000001939 inductive effect Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 10
- 230000008030 elimination Effects 0.000 description 9
- 238000003379 elimination reaction Methods 0.000 description 9
- 230000009467 reduction Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008713 feedback mechanism Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Abstract
The application discloses anechoic chamber examination support, including base, automatically controlled telescopic link, frame, rack, gear motor module and support bracket, automatically controlled telescopic link one end with the base rotates the cooperation together, the frame is in the same place with the other end cooperation of automatically controlled telescopic link, the base is located the both ends of automatically controlled telescopic link respectively with the frame, be provided with on the base and be used for the drive the rotatory rotating electrical machines of automatically controlled telescopic link, the rack install in on the frame, the gear motor module set up in on the frame, the gear motor module with the rack cooperation is in the same place, the rack with the base is in parallel state, the rack with automatically controlled telescopic link is in the vertical state, the gear motor module is used for the drive the rack removes on the frame, the support bracket directly or indirectly set up in on the rack.
Description
Technical Field
The invention relates to the field of acoustic test equipment, in particular to a support for calibrating an anechoic chamber.
Background
The main function of the anechoic chamber is to provide a free sound field space or a semi-free sound field space for an acoustic test, sound absorption processing is the key for ensuring that the anechoic chamber obtains good free sound field performance after being built, a microphone and a verification bracket for fixing the microphone are required to be arranged in the existing acoustic test, the existing verification bracket basically adopts a design of a telescopic sleeve and a tray (the tray is arranged on the telescopic sleeve, and the telescopic sleeve and the tray are in a vertical state), and the microphone, the fixed microphone and a preamplifier can be placed on the tray. The upper end of the inner pipe of the telescopic sleeve is fixed with the tray, can be adjusted up and down, and can also axially rotate, and the inner pipe and the outer pipe are compressed and fixed through screws. The calibration bracket with the structure has a problem in practical use, namely, when the microphone (or the microphone) is installed on a tray of the calibration bracket, the calibration bracket with the structure can only be manually operated to change the position of the microphone in the noise elimination chamber, so the calibration bracket with the structure cannot adjust the position of the microphone while testing is carried out, and the testing must be stopped when the position is required to be adjusted, so the adaptability is poor. In addition, the calibration bracket can not carry out 360-degree directivity test on the microphone, and can not meet a plurality of key index tests.
Disclosure of Invention
The invention provides a support for anechoic chamber verification, aiming at the problems.
The technical scheme adopted by the invention is as follows:
the utility model provides a anechoic chamber examination support, includes base, automatically controlled telescopic link, frame, rack, gear motor module and support bracket, automatically controlled telescopic link one end with the base rotates the cooperation together, the frame is in the same place with the other end cooperation of automatically controlled telescopic link, the base is located the both ends of automatically controlled telescopic link respectively with the frame, be provided with on the base and be used for the drive the rotatory rotating electrical machines of automatically controlled telescopic link, the rack install in on the frame, the gear motor module set up in on the frame, the gear motor module with the rack cooperation is in the same place, the rack with the base is in parallel state, the rack with automatically controlled telescopic link is in the vertical state, the gear motor module is used for the drive the rack removes on the frame, support bracket direct or indirect set up in on the rack.
In this kind of examination support, be used for placing the microphone on the support bracket, the rotating electrical machines on the base rotates and can drive automatically controlled telescopic link and rotate, and the rotation of automatically controlled telescopic link can drive the support bracket rotatory, and the gear motor module can drive the rack and move on the frame, and the rack removes and can drive the support bracket and remove, and when automatically controlled telescopic link stretches out and draws back, can drive the support bracket and remove, automatically controlled telescopic link, rotating electrical machines and gear motor three have realized the change of bearing seat position in three-dimensional space, so when this kind of examination support is placed in the noise elimination indoor, the microphone on the bearing seat can be in the change on the spatial position.
In conclusion, when the verification bracket is placed in the noise elimination chamber, the position of the microphone in the noise elimination chamber can be adjusted while testing is performed, and meanwhile, compared with manual adjustment, the adjustment speed is higher, and the adjustment precision is higher. And the automatic verification platform can be accessed, so that the verification efficiency is greatly improved.
In the bracket, the rotating motor on the base can drive the electric control telescopic rod to rotate by 0-360 degrees and also can rotate according to a set degree, so that the directivity test of the microphone is time-saving and labor-saving, and the automatic test is facilitated.
Optionally, a trigger switch is arranged on the bracket.
The specific trigger switch is used for cutting off a circuit, and when the rack directly or indirectly touches the trigger switch, the speed reduction motor module immediately stops rotating.
Optionally, the sound absorption device further comprises a sound absorption cover, the base is provided with the sound absorption cover, the electric control telescopic rod is provided with the sound absorption cover, and the frame is provided with the sound absorption cover.
Because automatically controlled telescopic link and gear motor module all rely on the motor to drive, and the motor can produce the noise with can not avoiding at the during operation, in order to avoid the motor noise to cause the influence to the test procedure, so on the base, all wrap the sound-absorbing cover on automatically controlled telescopic link and the rack (this just can cover rotating electrical machines completely like this, gear motor module and automatically controlled telescopic link), utilize the sound-absorbing cover to absorb the noise that the motor during operation produced, more importantly reduces the interference that the support self acoustic reflection caused the examination of the microphone simultaneously.
Optionally, the gear rack assembly further comprises a driving gear set and a worm gear set, wherein the driving gear set and the worm gear set are both arranged on the frame, the driving gear set and the worm gear set are combined together, the driving gear set and the gear rack are combined together, and the worm gear set and a worm gear on the gear motor module are combined together.
The driving gear set and the worm gear set are used for playing a linkage role, so that the gear motor set can drive the rack to move on the frame, the moving direction of the rack is perpendicular to the electric control telescopic rod, and the moving direction of the rack is parallel to the base.
Optionally, the electric control telescopic rod further comprises a support rod, the support rod is matched with the rack, the support bracket is matched with the support rod, the support rod is perpendicular to the rack, and the support rod and the electric control telescopic rod are in a parallel state.
Optionally, the rack support device further comprises a locking block, and the stay bar is matched with the rack through the locking block.
The locking block is used for mounting the stay bar on the rack.
Optionally, the locking device further comprises a touch block, the touch block and the locking block are both arranged on the rack, and the touch block and the locking block are respectively located at two ends of the rack.
The effect of specific latch segment and touch piece all is with trigger switch contact, when latch segment or touch piece and trigger switch contact, then represented the rack and has moved extreme position, and the gear motor module stops the motion immediately, prevents to harm examination support or measured appearance ware, avoids the loss.
Optionally, the bearing plate is provided with a locking screw.
The specific locking screw is a 1/4 locking screw, and because common microphones are all provided with British 1/4 nuts, the supporting bracket is provided with the British 1/4 locking screw which can be adjusted forwards and backwards and is used for reliably fixing the microphones, and the 1/4 locking screw can also be used as a basic fixing mode for expanding the module, so that the supporting bracket is simple and reliable.
Optionally, still include photoelectric detection switch and swinging boom, the swinging boom set up in on the rotating electrical machines, the photoelectric detection switch sets up on the base, the photoelectric detection switch is used for detecting the response swinging boom.
The photoelectric detection switch and the rotating arm are arranged to monitor the working state of the rotating motor, the rotating motor on the base can drive the rotating arm to rotate around the shaft of the rotating motor during working, and the rotating motor can drive the electric control lifting rod to rotate during working.
Optionally, the device further comprises a limiting block, and the limiting block is arranged on the base.
The specific limiting block is used for limiting the rotation of the rotating arm, so that the rotation angle value of the electric control telescopic rod is limited.
The beneficial effects of the invention are: when the microphone is placed in the noise elimination chamber, the position of the microphone in the noise elimination chamber can be adjusted while testing is carried out, and meanwhile, compared with manual adjustment, the microphone is faster in adjustment speed and higher in adjustment precision. And the automatic verification platform can be accessed, so that the verification efficiency is greatly improved.
Description of the drawings:
figure 1 is a schematic, diagrammatic view of an anechoic chamber calibration mount;
FIG. 2 is a schematic view of the matching relationship among the electrically controlled telescopic rod, the rack and the base;
FIG. 3 is a schematic view of the installation positions of the rotating arm, the photoelectric switch and the limiting block on the base;
FIG. 4 is a schematic diagram of the detection principle of the rotary arm and the photoelectric switch;
FIG. 5 is a schematic view showing the engagement of the rack with the sound-absorbing cover;
fig. 6 is a schematic view showing the fitting relationship of the rack and the frame.
The figures are numbered: 1. a base; 2. a rotating electric machine; 3. an electric control telescopic rod; 4. a speed reduction motor module; 5. a frame; 6. a touch switch; 7. a touch block; 8. a rack; 9. a locking block; 10. a stay bar; 11. a support bracket; 1101. locking screws; 12. a microphone; 13. a sound absorbing cover; 14. a worm gear set; 15. a drive gear set; 16. a rotating arm; 17. a photoelectric detection switch; 1801. a first stopper; 1802. a second limiting block; 19. flat veneering; 20. obliquely pasting the surface; 21. a connecting seat.
The specific implementation mode is as follows:
the present invention will be described in detail below with reference to the accompanying drawings.
As shown in the accompanying drawings 1, 2 and 6, a anechoic chamber verification support comprises a base 1, an electric control telescopic rod 3, a frame 5, a rack 8, a speed reduction motor module 4 and a support bracket 11, wherein one end of the electric control telescopic rod 3 is rotationally matched with the base 1, the frame 5 is matched with the other end of the electric control telescopic rod 3, the base 1 and the frame 5 are respectively arranged at two ends of the electric control telescopic rod 3, the base 1 is provided with a rotating motor 2 used for driving the electric control telescopic rod 3 to rotate, the rack 8 is installed on the frame 5, the speed reduction motor module 4 is arranged on the frame 5, the speed reduction motor module 4 is matched with the rack 8, the rack 8 and the base 1 are in a parallel state, the rack 8 and the electric control telescopic rod 3 are in a vertical state, the speed reduction motor module 4 is used for driving the rack 8 to move on the frame 5, and the support bracket 11 is directly or indirectly arranged on the rack 8.
In this kind of examination support, be used for placing microphone 12 on the support bracket 11, 2 rotations of the rotating electrical machines on the base 1 can drive automatically controlled telescopic link 3 and rotate, and 3 rotations of automatically controlled telescopic link can drive support bracket 11 rotatory, and gear motor module 4 can drive rack 8 and move on frame 5, and rack 8 removes and can drive support bracket 11 and remove, and when automatically controlled telescopic link 3 stretches out and draws back, can drive support bracket 11 and remove, automatically controlled telescopic link 3, rotating electrical machines 2 and gear motor three have realized the change of bearing seat position in the three-dimensional space, so this kind of examination support places when in the noise elimination indoor, microphone 12 on the bearing seat can be in the change on the spatial position.
In conclusion, when the verification bracket is placed in the noise elimination chamber, the position of the microphone 12 in the noise elimination chamber can be adjusted while testing is performed, and compared with manual adjustment, the adjustment speed is higher, and the adjustment precision is higher. And the automatic verification platform can be accessed, so that the verification efficiency is greatly improved.
In the bracket, the rotating motor 2 on the base 1 can drive the electric control telescopic rod 3 to rotate by 0-360 degrees and also can rotate according to a set degree, so that the directivity test of the microphone is time-saving and labor-saving, and the automatic test is also facilitated.
As shown in fig. 1, 2 and 6, the bracket is provided with a trigger switch.
The specific trigger switch is used for cutting off a circuit, and when the rack 8 directly or indirectly touches the trigger switch, the speed reduction motor module 4 immediately stops rotating.
As shown in fig. 1, 2 and 6, the electric telescopic rod further comprises a sound absorption cover 13, the sound absorption cover 13 is arranged on the base 1, the sound absorption cover 13 is arranged on the electric telescopic rod 3, and the sound absorption cover 13 is arranged on the frame 5.
Because automatically controlled telescopic link 3 and gear motor module 4 all rely on the motor to drive, and the motor can produce the noise with can not avoiding when working, in order to avoid the motor noise to lead to the fact the influence to the test procedure, so on base 1, all wrap the sound-absorbing cover 13 on automatically controlled telescopic link 3 and the rack 8 (this just can cover rotating electrical machines 2, gear motor module 4 and automatically controlled telescopic link 3 completely so), utilize the sound-absorbing cover 13 to absorb the noise that the motor produced in working, more importantly reduces the interference that the support self acoustic reflection of examination caused to the examination of microphone simultaneously.
Specifically, the sound absorbing cover 13 sleeved on the base 1 is in a stepped circular truncated cone shape, the sound absorbing cover 13 sleeved on the electric control telescopic rod 3 is in a cylindrical shape, the shape of the sound absorbing cover 13 of the rack 8 is shown in figure 5, a connecting seat 21 is installed on the rack 8, the sound absorbing cover 13 on the rack 8 is in a roughly cylindrical shape,
as shown in fig. 1, 2 and 6, the electric vehicle further includes a driving gear set 15 and a worm gear set 14, the driving gear set 15 and the worm gear set 14 are both disposed on the frame 5, the driving gear set 15 is matched with the worm gear set 14, the driving gear set 15 is matched with the rack 8, and the worm gear set 14 is matched with the worm gear on the reduction motor module 4.
The driving gear set 15 and the worm gear set 14 are used for linkage, so that the gear motor module 4 can drive the rack 8 to move on the frame 5, the moving direction of the rack 8 is perpendicular to the electric control telescopic rod 3, and the moving direction of the rack 8 is parallel to the base 1.
As shown in fig. 1, 2 and 6, the electric telescopic rod further comprises a stay bar 10, the stay bar 10 is matched with the rack 8, the support bracket 11 is matched with the stay bar 10, the stay bar 10 is perpendicular to the rack 8, and the stay bar 10 is parallel to the electric telescopic rod 3.
As shown in fig. 1, 2 and 6, the locking device further comprises a locking block 9, and the stay bar 10 is matched with the rack 8 through the locking block 9.
The locking block 9 serves to mount the stay 10 to the rack 8.
As shown in fig. 1, 2 and 6, the device further includes a touch block 7, the touch block 7 and the locking block 9 are both disposed on the rack 8, and the touch block 7 and the locking block 9 are respectively located at two ends of the rack 8.
The specific locking block 9 and the touch block 7 are both in contact with the trigger switch, and when the locking block 9 or the touch block 7 is in contact with the trigger switch, it represents that the rack 8 has moved to the limit position, and the gear motor module 4 needs to immediately stop driving the rack 8 to move or immediately drive the rack 8 to move reversely.
As shown in fig. 1, 2 and 6, the support plate is provided with a locking screw 1101.
The specific locking screw 1101 is 1/4 locking screw 1101, because common microphones 12 are all provided with British 1/4 nuts, the supporting bracket 11 of the present invention is provided with the British 1/4 locking screw 1101 which can be adjusted back and forth for reliably fixing the microphones 12, and the 1/4 locking screw 1101 can also be used as a basic fixing mode for expanding the module, and is simple and reliable.
As shown in fig. 1, 2 and 6, the device further comprises a photoelectric detection switch 17 and a rotary arm 16, wherein the rotary arm 16 is disposed on the rotary motor 2, the photoelectric detection switch 17 is disposed on the base 1, and the photoelectric detection switch 17 is used for detecting the induction rotary arm 16.
The photoelectric detection switch 17 and the rotating arm 16 are arranged to monitor the working state of the rotating motor 2, the rotating motor 2 on the base 1 can drive the rotating arm 16 to rotate around the shaft of the rotating motor 2 when working, and the rotating motor 2 can drive the electric control lifting rod to rotate when working.
As shown in fig. 1, 2 and 6, the device further comprises a limiting block, and the limiting block is arranged on the base 1.
Referring to fig. 3 and fig. 4, the limiting blocks include a first limiting block 1801 and a second limiting block 1802, a flat attaching surface 19 (perpendicular to the base 1) and an inclined attaching surface 20 (an included angle between the flat attaching surface and the base 1 is an acute angle) are disposed on both the first limiting block 1801 and the second limiting block 1802, the flat attaching surface 19 on the first limiting block 1801 and the flat attaching surface 19 on the second limiting block 1802 are in the same plane, the inclined attaching surface 20 on the second limiting block 1802 and the inclined attaching surface 20 on the first limiting block 1801 are opposite in inclination direction, a through hole is disposed on the base 1, the first limiting block 1801 and the second limiting block 1802 are respectively mounted in the through hole of the base 1 through a spring, when the first limiting block 1801 and the second limiting block 1802 are squeezed, the first limiting block 1801 and the second limiting block 1802 can rebound to the base under the action of the spring, when the external squeezing is removed, the photoelectric detection switch 17 of the rotating arm 16 senses and detects that the flat attaching surface 19 of the rotating arm 16 or the second limiting block 1801 or the flat attaching surface 1802, and only the rotating arm can rotate to the most of the two limiting blocks 1802, and the rotating arm 16 can rotate by the angle, and the rotating arm can be limited by the two limiting arm 16.
Taking the direction shown in fig. 4 as an example, when the rotating arm 16 rotates counterclockwise, the rotating arm 16 will contact with the oblique attaching surface 20 on the second limiting block 1802 first, and press the second limiting block 1802 into the base 1, when the second limiting block 1802 rotates to be sensed by the photo detection switch 17, the rotating arm 16 will attach to the flat attaching surface 19 on the first limiting block 1801, the rotating arm 16 cannot rotate continuously, at this time, if the rotating arm 16 rotates to change to rotate clockwise, the rotating arm 16 will rotate to press the first limiting block 1801, and when the rotating arm 16 rotates to attach to the flat attaching surface 19 of the second limiting block 1802, the rotating arm 16 cannot rotate continuously. In use, the position of the rotary arm 16 detected by the photodetection switch 17 may be set as an initial position (0 ° position) or a final position (360 ° position). Therefore, the photoelectric detection switch 17 is arranged at the initial position of 0 degree or 360 degrees in the verification bracket, and whether the rotating shaft reaches the initial position is fed back according to the on-off state of the photoelectric detection switch. The triggering logic is that the photoelectric detection switch 17 is turned off before being turned on, and the rotating arm 16 reaches the initial position. One end of the rotating arm 16 far away from the shaft is provided with a baffle plate with a light through hole or a light through seam in the middle of fan-shaped sides at two sides, the extension line of the fan-shaped sides passes through the rotating axis, and the angle from the two fan-shaped sides to the light through hole or the light through seam is determined. When the fan-shaped edge blocks the signal of the photoelectric detection switch 17, the signal input by the photoelectric detection switch 17 is interrupted, the microprocessor calculates and outputs a proper motor driving signal according to the angle difference between the current position and the final position of the rotating arm 16, so that the rotating arm 16 is finally positioned in the light through hole or the light through gap, the signal output of the photoelectric detection switch 17 can be just allowed, and the motor completely stops outputting at the moment. The design of the two-time feedback mechanism of first-on and second-off can effectively solve the technical problem that the rotating arm 16 exceeds the initial position when the impact is limited by the inertia counterclockwise (clockwise) or when no mechanical limit block exists.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, which is defined by the claims and their equivalents, and can be directly or indirectly applied to other related fields of technology.
Claims (10)
1. The utility model provides a anechoic chamber examination support, its characterized in that, includes base, automatically controlled telescopic link, frame, rack, gear motor module and support bracket, automatically controlled telescopic link one end with the base rotates the cooperation together, the frame is in the same place with the other end cooperation of automatically controlled telescopic link, the base is located the both ends of automatically controlled telescopic link respectively with the frame, be provided with on the base and be used for the drive the rotatory rotating electrical machines of automatically controlled telescopic link, the rack install in on the frame, the gear motor module set up in on the frame, the gear motor module with the rack cooperation is in the same place, the rack with the base is in parallel state, the rack with automatically controlled telescopic link is in the vertical state, the gear motor module is used for the drive the rack removes on the frame, the support bracket directly or indirectly set up in on the rack.
2. The anechoic chamber assay support of claim 1, wherein a trigger switch is provided on said support.
3. The anechoic chamber verification support as claimed in claim 1, further comprising a sound absorbing cover, wherein the base is provided with the sound absorbing cover, the electrically-controlled telescopic rod is provided with the sound absorbing cover, and the frame is provided with the sound absorbing cover.
4. The anechoic chamber verification bracket of claim 1, further comprising a drive gear set and a worm gear set, wherein the drive gear set and the worm gear set are both disposed on the frame, the drive gear set and the worm gear set are combined together, the drive gear set and the rack are combined together, and the worm gear set and a worm gear on the gear motor module are combined together.
5. The anechoic chamber certification stand of claim 1, further comprising a brace engaged with the rack, the support bracket engaged with the brace, the brace perpendicular to the rack, and the brace parallel to the electrically controlled telescoping pole.
6. The anechoic chamber verification mount of claim 5, further comprising a locking block, wherein the brace is mated with the rack by the locking block.
7. The anechoic chamber verification support as claimed in claim 6, further comprising a touch block, wherein the touch block and the locking block are both disposed on the rack, and the touch block and the locking block are respectively disposed at two ends of the rack.
8. The anechoic chamber certification stand of claim 1, wherein the support tray is provided with locking screws.
9. The anechoic chamber verification support of claim 1, further comprising a photoelectric detection switch and a rotary arm, wherein the rotary arm is disposed on the rotary motor, the photoelectric detection switch is disposed on the base, and the photoelectric detection switch is configured to detect the inductive rotary arm.
10. The anechoic chamber verification bracket of claim 9, further comprising a stop block disposed on the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211438957.5A CN115752710A (en) | 2022-11-17 | 2022-11-17 | Anechoic chamber verification support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211438957.5A CN115752710A (en) | 2022-11-17 | 2022-11-17 | Anechoic chamber verification support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115752710A true CN115752710A (en) | 2023-03-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211438957.5A Pending CN115752710A (en) | 2022-11-17 | 2022-11-17 | Anechoic chamber verification support |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990041924U (en) * | 1998-05-28 | 1999-12-27 | 전주범 | Stopper device for shock absorption of rotating arm |
| KR101260038B1 (en) * | 2011-11-02 | 2013-05-06 | 한국산업기술시험원 | Directional characteristics of noise meter measuring device |
| CN204675368U (en) * | 2015-05-30 | 2015-09-30 | 歌尔声学股份有限公司 | A kind of classification pickup device |
| CN111649208A (en) * | 2020-06-01 | 2020-09-11 | 中国船舶科学研究中心 | Digital acoustic equipment compatibility test platform based on motion control |
| CN113588068A (en) * | 2021-09-09 | 2021-11-02 | 国网上海市电力公司 | Power transformer noise auxiliary detection device and execution method |
| CN214845018U (en) * | 2020-12-10 | 2021-11-23 | 广东省建设工程质量安全检测总站有限公司 | Building sound insulation detection device |
| CN113959559A (en) * | 2021-11-08 | 2022-01-21 | 陕西省计量科学研究院 | Turntable of sound level meter calibrating device |
-
2022
- 2022-11-17 CN CN202211438957.5A patent/CN115752710A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990041924U (en) * | 1998-05-28 | 1999-12-27 | 전주범 | Stopper device for shock absorption of rotating arm |
| KR101260038B1 (en) * | 2011-11-02 | 2013-05-06 | 한국산업기술시험원 | Directional characteristics of noise meter measuring device |
| CN204675368U (en) * | 2015-05-30 | 2015-09-30 | 歌尔声学股份有限公司 | A kind of classification pickup device |
| CN111649208A (en) * | 2020-06-01 | 2020-09-11 | 中国船舶科学研究中心 | Digital acoustic equipment compatibility test platform based on motion control |
| CN214845018U (en) * | 2020-12-10 | 2021-11-23 | 广东省建设工程质量安全检测总站有限公司 | Building sound insulation detection device |
| CN113588068A (en) * | 2021-09-09 | 2021-11-02 | 国网上海市电力公司 | Power transformer noise auxiliary detection device and execution method |
| CN113959559A (en) * | 2021-11-08 | 2022-01-21 | 陕西省计量科学研究院 | Turntable of sound level meter calibrating device |
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