CN110400556B - Buzzer structure convenient to mount and provided with composite audio - Google Patents
Buzzer structure convenient to mount and provided with composite audio Download PDFInfo
- Publication number
- CN110400556B CN110400556B CN201910509214.4A CN201910509214A CN110400556B CN 110400556 B CN110400556 B CN 110400556B CN 201910509214 A CN201910509214 A CN 201910509214A CN 110400556 B CN110400556 B CN 110400556B
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- hole
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- composite audio
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- 239000002131 composite material Substances 0.000 title claims abstract description 19
- 238000004804 winding Methods 0.000 claims description 12
- 230000004044 response Effects 0.000 claims description 4
- 230000002889 sympathetic effect Effects 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 24
- 230000017525 heat dissipation Effects 0.000 abstract description 2
- 210000000056 organ Anatomy 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Emergency Alarm Devices (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
The invention discloses a buzzer structure with composite audio frequency, which is convenient to install and comprises a shell, a piezoelectric buzzer piece and a resonance chamber, wherein the piezoelectric buzzer piece is arranged in the shell, the resonance chamber is arranged at the top end of the piezoelectric buzzer piece, and an outer ring is arranged at the bottom of the shell. The air at the bottom of the buzzer is circulated, and the heat dissipation effect of the buzzer is improved.
Description
Technical Field
The invention relates to the technical field of buzzers, in particular to a buzzer structure with a composite audio frequency, which is convenient to install.
Background
The buzzer is an electronic buzzer with an integrated structure, adopts direct current voltage for power supply, is widely applied to electronic products such as computers, printers, copiers, alarms, electronic toys, automobile electronic equipment, telephones, timers and the like as a sounding device, wherein the buzzer with composite audio comprises a piezoelectric buzzer, the piezoelectric buzzer mainly comprises a multivibrator, a piezoelectric buzzer, an impedance matcher, a resonance box, a shell and the like, the composite audio frequency is generated by the sound production of the piezoelectric buzzer, the existing buzzer has simple structure, the shell is fixed as a whole, when the mounting hole of the fixed plane is not fit with the fixed block of the buzzer due to error, the mounting of the buzzer is difficult, and the overlong connecting wire is exposed outside, the connecting wire can be wound with external objects, the normal work of the device is influenced, the installation wastes time and labor, therefore, a buzzer structure with a composite audio frequency is needed to solve the above problems.
Disclosure of Invention
The invention provides a buzzer structure with composite audio frequency, which can effectively solve the problems that the existing buzzer in the background art is simple in structure, the shell is integrally fixed, when a mounting hole of a fixing plane is not matched with a fixing block of the buzzer due to errors, the buzzer is difficult to mount, and the device is wound with an external object due to the fact that an overlong connecting wire is exposed outside, so that the normal work of the device is influenced, and the mounting is time-consuming and labor-consuming.
In order to achieve the purpose, the invention provides the following technical scheme: a buzzer structure with composite audio convenient to install comprises a shell, a piezoelectric buzzer piece and a resonance chamber, wherein the piezoelectric buzzer piece is installed inside the shell, the resonance chamber is arranged at the top end of the piezoelectric buzzer piece, and an outer ring is installed at the bottom of the shell;
the outer ring central point puts the department and has seted up the spout, the inside top of spout and bottom all seted up flutedly, spout internally mounted has the slider, the fixed block is installed to slider one end, connecting screw is installed on the slider top, connecting screw outside threaded connection has lock nut.
Preferably, the slider is T-shaped, and two T-shaped ends of the slider are clamped into the two grooves.
Preferably, the fixed block is connected with the sliding block through a movable shaft, so that the fixed block can freely rotate around the sliding block.
Preferably, the bottom end of the outer ring is provided with a wire take-up assembly;
the take-up assembly comprises a take-up box, a take-up pulley, a rotating shaft, a rotating ring, a through wire hole and a rubber pad;
the utility model discloses a take-up reel, including outer loop, take-up reel, rotating ring and line hole, the outer loop bottom is installed and is received the line box, it has the take-up pulley to receive line box internally mounted, the embedding of take-up pulley central point department of putting installs the pivot, rotatory ring has been cup jointed in the take-up pulley bottom outside, rotatory ring links to each other with pivot one end, and it is rotatory to drive the pivot by rotatory ring, it has seted.
Preferably, a connecting wire is wound on the outer side of the take-up pulley, and one end of the connecting wire penetrates through the wire through hole;
preferably, a chassis component is mounted at the bottom end of the take-up box;
the chassis component comprises a chassis, a through hole, a bump, an inner ring, a bearing hole and a connecting spring;
the wire winding box is characterized in that a base plate is installed at the bottom end of the wire winding box, through holes are evenly formed in the edge portion of the base plate, a protruding block is inserted into the edge portion of the bottom end of the base plate, the top end of the protruding block is connected with an inner ring, bearing holes are evenly formed in the edge portion of the inner ring, and connecting springs are evenly installed at the top end of the inner ring.
Preferably, the diameter of the receiving hole is larger than that of the through hole.
Preferably, one end of the connecting spring is connected with the top end of the inner ring, and the other end of the connecting spring is connected with the bottom end of the wire winding box.
Preferably, the top end of the shell is provided with a top cover assembly;
the top cover assembly comprises a top cover, a sound playing hole, an L plate and an arc-shaped block;
the top cover is installed on the shell top, the broadcast hole has been seted up at the top cover top, the top cover bottom is installed with broadcast hole corresponding position department and is connect L board, the arc piece is installed to L board one end.
Preferably, the number of the sound holes and the number of the L plates are three, and the width of each L plate is larger than the diameter of each sound hole.
Compared with the prior art, the invention has the beneficial effects that: the invention has scientific and reasonable structure and safe and convenient use:
1. be provided with the outer loop, through the effect of spout, recess, slider and fixed block, be convenient for according to the actual conditions of mounted position to the concrete position of fixed block is adjusted to the slip slider, and cooperation connecting screw and lock nut's effect is deadlocked fixedly its position, thereby makes the bee calling organ better install fixedly, through the effect of loose axle, is convenient for fold the fixed block according to the actual demand and hides, easy operation, and it is convenient to install and use.
2. Be provided with and receive the line subassembly, through receiving the effect of line box, take-up pulley, pivot, rotatory ring and logical line hole, be convenient for store and accomodate the connecting wire of overlength, make its connecting wire that pulls out suitable length according to actual demand connect, avoid the connecting wire of overlength to expose and lead to the winding or damage outward, influence the device and normally work, the effect of cooperation rubber pad avoids connecting wire pulling in-process and leads to line hole limit portion to rub, uses safe and reliable more.
3. Be provided with the chassis subassembly, through the chassis, the through-hole, the lug, the inner ring with accept the effect in hole, when bee calling organ installation, through the extrusion lug, make the hole of accepting of inner ring one side coincide with the through-hole, make bee calling organ bottom and installation position produce the circulation of air, thereby improve bee calling organ's radiating effect, prolong its service life, cooperation coupling spring's effect, when the device dismantles, will accept the hole automatically and stagger with the through-hole, thereby avoid device to remove in the transportation debris get into inside accepting hole and the through-hole, influence the radiating effect of device.
4. Be provided with the top cap subassembly, through the effect of broadcast hole and L board, avoid the sympathetic response room to directly communicate with each other with external environment to the effect of cooperation arc piece, thus block the dust that gets into with the external world in L board one side, improve the dustproof effect of device, avoid external dust accumulation inside the sympathetic response room, influence bee calling organ's tone quality.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the housing of the present invention;
FIG. 3 is a schematic structural view of the area A in FIG. 2 according to the present invention;
FIG. 4 is a schematic structural view of a wire takeup assembly of the present invention;
FIG. 5 is a schematic structural view of the undercarriage assembly of the present invention;
FIG. 6 is a schematic structural view of the cap assembly of the present invention;
reference numbers in the figures: 1. a housing; 2. a piezoelectric buzzer; 3. a resonance chamber; 4. an outer ring; 5. a chute; 6. a groove; 7. a slider; 8. a fixed block; 9. a movable shaft; 10. connecting a screw rod; 11. locking the nut;
12. a wire take-up assembly; 1201. a wire rewinding box; 1202. a take-up pulley; 1203. a rotating shaft; 1204. a rotating ring; 1205. a through hole; 1206. a rubber pad;
13. a connecting wire;
14. a chassis assembly; 1401. a chassis; 1402. a through hole; 1403. a bump; 1404. an inner ring; 1405. a bearing hole; 1406. a connecting spring;
15. a cap assembly; 1501. a top cover; 1502. a sound playing hole; 1503. an L plate; 1504. an arc-shaped block.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example (b): as shown in fig. 1-6, the invention provides a technical solution, a buzzer structure with composite audio frequency, which is convenient to install, comprises a shell 1, a piezoelectric buzzer piece 2 and a resonance chamber 3, wherein the piezoelectric buzzer piece 2 is installed in the shell 1, the resonance chamber 3 is arranged at the top end of the piezoelectric buzzer piece 2, and an outer ring 4 is installed at the bottom of the shell 1;
a sliding groove 5 is formed in the center of the outer ring 4, grooves 6 are formed in the top end and the bottom end of the inside of the sliding groove 5, a sliding block 7 is installed inside the sliding groove 5, a fixed block 8 is installed at one end of the sliding block 7, a connecting screw 10 is installed at the top end of the sliding block 7, a locking nut 11 is in threaded connection with the outer side of the connecting screw 10, the sliding block 7 is fixed inside the sliding groove 5 to slide conveniently, the sliding block 7 is T-shaped, two T-shaped ends of the sliding block 7 are clamped into the two grooves 6, the fixed block 8 is connected with the sliding block 7 through a movable shaft 9, the fixed block 8 freely rotates around the;
when the device carries out the during operation, at first place buzzer on the fixed plane, according to the concrete position of the mounting hole on the fixed plane, undulant slider 7, make it slide 5 inside at the spout, and slide to the position department corresponding with the mounting hole, thereby adjust fixed block 8 to suitable position, rotatory lock nut 11 after that, make it closely laminate with outer loop 4 top, utilize its frictional force with the 4 top of outer loop to carry out locking work with slider 7, carry out fixed connection with the mounting hole on fixed block 8 and the fixed plane through the screw after that, wherein, through the effect of loose axle 9, fold unnecessary fixed block 8 and hide, thereby accomplish the installation of buzzer, and easy operation, it is convenient to install and use.
In order to improve the heat dissipation effect of the device, a chassis assembly 14 is mounted at the bottom end of the take-up box 1201, the chassis assembly 14 comprises a chassis 1401, a through hole 1402, a bump 1403, an inner ring 1404, a bearing hole 1405 and a connecting spring 1406, the chassis 1401 is mounted at the bottom end of the take-up box 1201, the through hole 1402 is uniformly formed in the edge portion of the chassis 1401, the bump 1403 is mounted in the bottom end portion of the chassis 1401 in an inserted mode, the inner ring 1404 is connected to the top end of the bump 1403, the bearing hole 1405 is uniformly formed in the edge portion of the inner ring 1404, the connecting spring 1406 is uniformly mounted at the top end of the inner ring 1404, the diameter of the bearing hole 1405 is larger than that of the through hole 1402, the bearing hole 1405 and the through hole 1402 are staggered;
when the device is installed, lug 1403 and the fixed plane contact of chassis 1401 bottom, carry out zonulae occludens along with fixed block 8 and mounting hole, make lug 1403 atress rebound, thereby drive inner ring 1404 rebound, and make connecting spring 1406 compress, make the receiving hole 1405 and the coincidence of through-hole 1402 of inner ring 1404 one side, make chassis 1401 department circulation of air, improve the radiating effect between chassis 1401 and the fixed plane, when the device is dismantled, chassis 1401 bottom and fixed plane separation, then under the effect of connecting spring 1406 elasticity, make inner ring 1404 rebound, stagger receiving hole 1405 and through-hole 1402 automatically, avoid in the transportation removal process external impurity to get into through-hole 1402 and receiving hole 1405 inside to cause the jam, influence the radiating effect of device.
The bottom end of the outer ring 4 is provided with a wire take-up assembly 12, the wire take-up assembly 12 comprises a wire take-up box 1201, a wire take-up wheel 1202, a rotating shaft 1203, a rotating ring 1204, a wire through hole 1205 and a rubber pad 1206, the wire take-up box 1201 is arranged at the bottom end of the outer ring 4, the wire take-up wheel 1202 is arranged inside the wire take-up box 1201, a connecting wire 13 is wound outside the wire take-up wheel 1202, one end of the connecting wire 13 penetrates through the wire through hole 1205 to achieve the containing work of the connecting wire 13, the rotating shaft 1203 is embedded in the center of the wire take-up wheel 1202, the rotating ring 1204 is sleeved outside the bottom end of the wire take-up wheel 1202 and connected with one end of the rotating shaft 1203, the rotating shaft 1203 is driven to rotate by the rotating ring 1204;
when the device need carry out the switch on circuit, link to each other connecting wire 13 with external circuit, rotate rotatory ring 1204 after that, it is rotatory to drive pivot 1203 through rotatory ring 1204, and pivot 1203 drives take-up pulley 1202 and rotates, and take-up pulley 1202 rotates and drives connecting wire 13 and twine to accomodate the connecting wire 13 of external overlength and hide, avoid taking place the winding or causing wearing and tearing with other objects in the external world.
In order to improve the dustproof effect of the device, a top cover assembly 15 is installed at the top end of the shell 1, the top cover assembly 15 comprises a top cover 1501, broadcast holes 1502, an L plate 1503 and arc-shaped blocks 1504, the top cover 1501 is installed at the top end of the shell 1, the broadcast holes 1502 are formed in the top of the top cover 1501, the L plate 1503 is installed at the position, corresponding to the broadcast holes 1502, of the bottom of the top cover 1501, the arc-shaped blocks 1504 are installed at one end of the L plate 1503, the broadcast effect of the device is improved, meanwhile, the dustproof effect of the device is further improved, the number of the broadcast holes 1502 is three, and the width of the L plate 1503 is larger than;
when the device uses, spread away the inside sound of resonating chamber 3 through broadcast hole 1502, realize broadcast work, external environment's gas simultaneously flows into to resonating chamber 3 inside through broadcast hole 1502, effect through L board 1503, make the external air current of inflow carry out the baffling, and the effect of cooperation arc piece 1504, the dust that will mix with in the air current blocks, make the dust stop in L board 1503 one side, avoid it to get into and accumulate on piezoelectricity buzzer 2 in resonating chamber 3, influence buzzer's tone quality, improve the dustproof effect of device.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a buzzer structure that easy to assemble has compound audio frequency, includes shell (1), piezoelectricity buzzing piece (2) and sympathetic response room (3), shell (1) internally mounted has piezoelectricity buzzing piece (2), piezoelectricity buzzing piece (2) top is provided with sympathetic response room (3), its characterized in that: an outer ring (4) is arranged at the bottom of the shell (1);
outer ring (4) central point puts the department and has seted up spout (5), recess (6) have all been seted up to spout (5) inside top and bottom, spout (5) internally mounted has slider (7), fixed block (8) are installed to slider (7) one end, connecting screw (10) are installed on slider (7) top, connecting screw (10) outside threaded connection has lock nut (11).
2. The buzzer structure with composite audio frequency convenient to install according to claim 1, characterized in that: the slider (7) is T-shaped, and the T-shaped two ends of the slider (7) are clamped into the two grooves (6).
3. The buzzer structure with composite audio frequency convenient to install according to claim 1, characterized in that: the fixed block (8) is connected with the sliding block (7) through a movable shaft (9), so that the fixed block (8) can freely rotate around the sliding block (7).
4. The buzzer structure with composite audio frequency convenient to install according to claim 1, characterized in that: the bottom end of the outer ring (4) is provided with a wire take-up component (12);
the wire take-up assembly (12) comprises a wire take-up box (1201), a wire take-up wheel (1202), a rotating shaft (1203), a rotating ring (1204), a wire through hole (1205) and a rubber pad (1206);
the utility model discloses a wire winding machine, including outer ring (4), wire winding box (1201) is installed to outer ring (4) bottom, wire winding box (1201) internally mounted has take-up pulley (1202), pivot (1203) are installed in the embedding of take-up pulley (1202) central point department of putting, rotatory ring (1204) have been cup jointed in the outside of take-up pulley (1202) bottom, rotatory ring (1204) link to each other with pivot (1203) one end, and it is rotatory to drive pivot (1203) by rotatory ring (1204), wire winding box (1201) one side has been seted up and has been led to line hole (1205), the inside cementing of wire winding hole (1205) has.
5. The buzzer structure with composite audio frequency easy to install according to claim 4, characterized in that: a connecting wire (13) is wound on the outer side of the take-up pulley (1202), and one end of the connecting wire (13) penetrates through the through wire hole (1205).
6. The buzzer structure with composite audio frequency easy to install according to claim 4, characterized in that: the bottom end of the take-up box (1201) is provided with a chassis component (14);
the chassis component (14) comprises a chassis (1401), a through hole (1402), a bump (1403), an inner ring (1404), a bearing hole (1405) and a connecting spring (1406);
the wire winding box is characterized in that a base plate (1401) is installed at the bottom end of the wire winding box (1201), through holes (1402) are uniformly formed in the edge portion of the base plate (1401), a protruding block (1403) is installed at the edge portion of the bottom end of the base plate (1401) in an inserted mode, the top end of the protruding block (1403) is connected with an inner ring (1404), bearing holes (1405) are uniformly formed in the edge portion of the inner ring (1404), and connecting springs (1406) are uniformly installed at the top end of the.
7. The buzzer structure with composite audio frequency convenient to install according to claim 6, characterized in that: the diameter of the bearing hole (1405) is larger than that of the through hole (1402).
8. The buzzer structure with composite audio frequency convenient to install according to claim 6, characterized in that: one end of the connecting spring (1406) is connected with the top end of the inner ring (1404), and the other end of the connecting spring (1406) is connected with the bottom end of the take-up box (1201).
9. The buzzer structure with composite audio frequency convenient to install according to claim 1, characterized in that: a top cover assembly (15) is mounted at the top end of the shell (1);
the top cover assembly (15) comprises a top cover (1501), a broadcast hole (1502), an L-shaped plate (1503) and an arc-shaped block (1504);
top cap (1501) is installed on shell (1) top, sound hole (1502) have been seted up at top cap (1501) top, top cap (1501) bottom is installed L board (1503) with sound hole (1502) corresponding position department, arc piece (1504) are installed to L board (1503) one end.
10. The buzzer structure with composite audio frequency easy to install according to claim 9, characterized in that: the number of the sound holes (1502) is three, the number of the L plates (1503) is three, and the width of each L plate (1503) is larger than the diameter of each sound hole (1502).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910509214.4A CN110400556B (en) | 2019-06-13 | 2019-06-13 | Buzzer structure convenient to mount and provided with composite audio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910509214.4A CN110400556B (en) | 2019-06-13 | 2019-06-13 | Buzzer structure convenient to mount and provided with composite audio |
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| Publication Number | Publication Date |
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| CN110400556A CN110400556A (en) | 2019-11-01 |
| CN110400556B true CN110400556B (en) | 2021-05-07 |
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| CN201910509214.4A Active CN110400556B (en) | 2019-06-13 | 2019-06-13 | Buzzer structure convenient to mount and provided with composite audio |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111179892B (en) * | 2019-12-24 | 2020-08-14 | 汉得利（常州）电子股份有限公司 | High sound pressure level piezoelectric buzzer |
| CN112581926B (en) * | 2020-12-15 | 2022-03-11 | 新沂市承翔电子有限公司 | Electronic buzzer with high protection performance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3824185B2 (en) * | 1996-03-11 | 2006-09-20 | Ｔｄｋ株式会社 | Piezoacoustic transducer |
| CN2557652Y (en) * | 2002-07-10 | 2003-06-25 | 彭建 | Theft-proof alarm device for coiling door |
| US9671306B2 (en) * | 2011-05-23 | 2017-06-06 | Widget Lab Inc. | Water leak warning device |
| CN204680369U (en) * | 2015-05-29 | 2015-09-30 | 肇庆奥迪威传感科技有限公司 | Hummer |
| CN204857176U (en) * | 2015-08-13 | 2015-12-09 | 常州东村电子有限公司 | Single line package electromagnetic buzzer drive circuit who integrates entirely |
| CN106504735B (en) * | 2016-12-29 | 2023-08-11 | 汉得利（常州）电子股份有限公司 | Welding-free high-frequency high-sound pressure buzzer and production method |
| CN107174697A (en) * | 2017-07-28 | 2017-09-19 | 余军辉 | Infusion alarm |
| CN107893937A (en) * | 2017-12-14 | 2018-04-10 | 淮安市君睿创智工业设计有限公司 | A kind of Intelligent House Light device |
| CN207731638U (en) * | 2018-01-30 | 2018-08-14 | 东莞市声必利电子有限公司 | A kind of buzzer facilitating installation |
| CN208515477U (en) * | 2018-05-08 | 2019-02-19 | 南京晶能新能源智能汽车制造有限公司 | A kind of lithium battery automobile charge reminder device |
| CN208733822U (en) * | 2018-08-16 | 2019-04-12 | 金志远 | A kind of unidirectional-folding mechanism convenient for adjusting installation |
| CN208889313U (en) * | 2018-09-04 | 2019-05-21 | 广州凯立达电子股份有限公司 | A kind of piezoelectric active buzzer |
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