CN110403289A - Intelligent helmet is used in a kind of search and rescue - Google Patents
Intelligent helmet is used in a kind of search and rescue Download PDFInfo
- Publication number
- CN110403289A CN110403289A CN201910623766.8A CN201910623766A CN110403289A CN 110403289 A CN110403289 A CN 110403289A CN 201910623766 A CN201910623766 A CN 201910623766A CN 110403289 A CN110403289 A CN 110403289A
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- module
- rescue
- search
- intelligent helmet
- helmet
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- 238000004891 communication Methods 0.000 claims abstract description 21
- 230000006698 induction Effects 0.000 claims abstract description 16
- 238000005286 illumination Methods 0.000 claims abstract description 5
- 230000003321 amplification Effects 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
- 230000035939 shock Effects 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 241000282472 Canis lupus familiaris Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/0406—Accessories for helmets
-
- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/0406—Accessories for helmets
- A42B3/0433—Detecting, signalling or lighting devices
-
- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/0406—Accessories for helmets
- A42B3/0433—Detecting, signalling or lighting devices
- A42B3/044—Lighting devices, e.g. helmets with lamps
-
- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/0406—Accessories for helmets
- A42B3/0433—Detecting, signalling or lighting devices
- A42B3/046—Means for detecting hazards or accidents
-
- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/30—Mounting radio sets or communication systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Helmets And Other Head Coverings (AREA)
Abstract
The invention discloses a kind of search and rescue intelligent helmets, including helmet main body, the control module for coordinating and controlling search and rescue intelligent helmet overall work is provided in the helmet main body, for providing the power module of burning voltage with intelligent helmet overall work for search and rescue, for realizing the audio-frequency module of broadcast and dialogue function, wireless communication module for being communicated with external equipment, the locating module confirmed for treating rescue personnel position, for incuding the life induction module to rescue personnel's vital sign, for realizing the lighting module and switch key of illumination functions；The power module, audio-frequency module, wireless communication module, locating module, life induction module, lighting module and switch key are connected to control module；In practical rescue operations, the search and rescue that rescue worker can provide through the invention obtain location information, heart rate information etc. to rescue personnel with intelligent helmet, realize effective quick progress of rescue task.
Description
Technical field
The present invention relates to equipment technical field is searched and rescued, in particular to intelligent helmet is used in a kind of search and rescue.
Background technique
For underground work person during carrying out underground work, since natural conditions are poor, working environment is severe, makes its work
Danger coefficient it is higher with respect to other work；Therefore, what trouble free service was that underground work faces at present most important, most severe asks
Topic；However when a fault occurs, it according to traditional search and rescue mode, such as rescue dogs and life-detection instrument, has the disadvantage in that
1, for be buried under face deeper to rescue personnel, it is difficult to determine its position；
2, the vital sign situation to rescue personnel can not be determined；
3, when large area disaster occurs, the quantity of professional rescue worker is often unable to satisfy rescue and requires, and time-consuming and laborious, shadow
Ring search and rescue progress.
In addition, underground work person is during the work time, the helmet can be all worn, however existing helmet structure is relatively easy,
Do not have higher protection to the life of underground work person.
As it can be seen that the prior art could be improved and improve.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of search and rescue intelligent helmets, just
Location information, the heart rate information etc. to rescue personnel are obtained in rescue worker, realizes effective quick progress of rescue task.
In order to achieve the above object, this invention takes following technical schemes:
A kind of search and rescue uses intelligent helmet, including helmet main body, is provided in the helmet main body
For coordinating and controlling the control module of search and rescue intelligent helmet overall work；
For providing the power module of burning voltage with intelligent helmet overall work for search and rescue；
For realizing the audio-frequency module of broadcast and dialogue function；
Wireless communication module for being communicated with external equipment；
The locating module confirmed for treating rescue personnel position；
For incuding the life induction module to rescue personnel's vital sign；
For realizing the lighting module of illumination functions；
The switch key opened and stopped working for controlling search and rescue intelligent helmet；
The power module, audio-frequency module, wireless communication module, locating module, life induction module, lighting module and switch are pressed
Key is connected to control module.
In the search and rescue intelligent helmet, the locating module includes 433 chip of double frequency and RF power amplification chip, described
433 chip of double frequency and RF power amplification chip are connected to control module.
In the search and rescue intelligent helmet, the audio-frequency module include be set on search and rescue intelligent helmet for realizing
The loudspeaker of dialogue function and recording microphone, the audio coding chip for carrying out noise reduction to audio, for output volume into
The audio public affairs of row processing put chip；The audio-frequency module further includes being set on search and rescue intelligent helmet, for opening dialogue function
The dialogue key of energy；The loudspeaker, recording microphone, audio coding chip, audio public affairs put chip and dialogue key is connected to control
Molding block.
It further include the interface module for being attached with external equipment in the search and rescue intelligent helmet；It is described to connect
Mouth mold block includes projector's interface for being attached with outer projections equipment and for being attached with external lights equipment
Light units interface, projector's interface and light units interface are connected to control module.
In the search and rescue intelligent helmet, the lighting module includes the illumination for being set to search and rescue intelligent helmet front end
Lamp and the headlamp switch key opened and closed for controlling headlamp, the headlamp are connected to control by light units interface
Molding block, the headlamp switch key are connected to control module.
It further include the alarm module for realizing emergency alarm, the alarm module in the search and rescue intelligent helmet
It is connected to control module.
It further include for needing rescue worker and to be not required to what rescue worker distinguished in the search and rescue intelligent helmet
Personnel check module, and the personnel check module and are connected to control module.
In the search and rescue intelligent helmet, further include for detect to rescue personnel be impacted degree shock incude mould
Block, the shock induction module are connected to control module.
In the search and rescue intelligent helmet, it includes gravity sensor that the personnel, which check module, the gravity sensor
It is connected to control module.
The present invention has also correspondingly provided a kind of communication system based on above-mentioned search and rescue intelligent helmet, including search and rescue intelligence
The energy helmet and mobile device, the search and rescue carry out information exchange by wireless communication module and mobile device with intelligent helmet.
Beneficial effect
Compared with prior art, it the present invention provides a kind of search and rescue intelligent helmet, has the advantage that
(1) pass through the cooperation of double frequency 433 chip and RF power amplification chip, rescue worker can be known relatively interior at a distance to rescuer
The location information of member, convenient for the quick progress of rescue task.
(2) personnel, which check module, to improve the standard of rescue task to needing rescue personnel and be not required to rescue personnel and distinguish
Exactness.
(3) it communicates to be realized by search and rescue intelligent helmet between rescue personnel, to a certain extent, can help wait rescue
Personnel's realization is helped to save oneself.
Detailed description of the invention
Fig. 1 is the structural schematic diagram provided by the present invention searched and rescued and use intelligent helmet；
Fig. 2 is the system structure diagram provided by the present invention searched and rescued and use intelligent helmet；
Fig. 3 is the system construction drawing of locating module provided by the invention；
Fig. 4 is the system construction drawing of audio-frequency module provided by the invention；
Fig. 5 is the system construction drawing of interface module provided by the invention；
Fig. 6 is the structural schematic diagram of communication system provided by the present invention.
Specific embodiment
The present invention provides a kind of search and rescue intelligent helmets, to keep the purpose of the present invention, technical solution and effect more clear
Chu defines, and invention is further described in detail as follows in conjunction with drawings and embodiments.It should be understood that this place is retouched
It states that specific examples are only used to explain the present invention, is not intended to limit the present invention.
In the description of the present invention, it is to be understood that, the orientation or positional relationship of the instructions such as term " front end " is this hair
The bright orientation or positional relationship based on attached drawing, is merely for convenience of description of the present invention and simplification of the description.
Fig. 1 and Fig. 2 are please referred to, the present invention provides a kind of search and rescue intelligent helmet, including helmet main body 1, the helmets
It is provided on ontology 1
Control module, the control module are used to coordinate and control the overall work of search and rescue intelligent helmet；In the present embodiment,
The control module can be, but not limited to be MCU micro-control unit.
Power module, the power module is used to provide burning voltage for the overall work of search and rescue intelligent helmet, described
Power module is connected to control module；In the present embodiment, the power module can be, but not limited to be battery；The electric power storage
Pond is removable installed in helmet main body by buckle, is convenient for the replacement of battery.
Audio-frequency module, the audio-frequency module help user to realize that broadcast and dialogue function, the audio-frequency module are connected to control
Molding block.
Wireless communication module, the wireless communication module make search and rescue intelligent helmet can be with external equipment, such as cell phone
Etc. being communicated, the communication between search and rescue intelligent helmet can also be realized, the wireless communication module is connected to control module；In
In the present embodiment, the wireless communication module includes WIFI chip and Bluetooth chip.
Locating module, the position that the locating module facilitates rescue worker to treat rescue personnel confirm, the positioning
Module is connected to control module.
Life induction module, the life induction module are used to incude the vital sign information to rescue personnel, the life
Life induction module is connected to control module；In the present embodiment, the life induction module includes being arranged in helmet main body
Heart rate sensor, the heart rate sensor are connected to control module；Heart rate sensor collects the heart rate information to rescue personnel, the heart
Rate information is transferred to control module after LDO linear voltage stabilization.
Lighting module, the lighting module for realizing illumination functions, convenient for rescue personnel in the process waited for rescue
Middle to carry out activity of saving oneself, the lighting module is connected to control module.
Switch key 11, the switch key are opened and stop working for controlling search and rescue intelligent helmet, the switch
Key is connected to control module；In the present embodiment, switch key 11 is secondary or physical bond, when needs use search and rescue intelligent helmet
When, switch key is pressed, search and rescue intelligent helmet enters normal operating conditions；When use finishes, switch key is pressed again,
Search and rescue are stopped working with intelligent helmet.
Further, referring to Fig. 3, the locating module includes 433 chip of double frequency and RF power amplification chip, the double frequency
433 chips and RF power amplification chip are connected to control module；In the present embodiment, the locating module further includes GPS fixed
Position module and Beidou positioning module；When GPS positioning module failure, positioning is basic standard, 433 chip of double frequency with RSSI algorithm
Location information is issued, then cooperates RF power amplification chip that signal is amplified, external equipment can be searched and rescued in relatively remote obtain with intelligence
The location information of the helmet；It is fixed using WIFI when the position of rescue worker and search and rescue intelligent helmet are closer (within the scope of 50 meters)
Position technology can calculate the more accurately circumference range where search and rescue intelligent helmet；As rescue worker and search and rescue intelligent helmet
Position further towards when (within the scope of 10 meters), using Ibeacon Bluetooth technology realize short distance high accuracy positioning.
433 chips have the function of positioning, detour and penetrate, and other than the influence of metal material, 433 chips, which can pass through, appoints
Anticipate material article and do not reduce its and read distance, i.e., by 433 chips, rescue worker can accurately grab buried under rubble
The location signal that search and rescue intelligent helmet is issued；And it is using 433 chip of double frequency, WIFI chip and Ibeacon Bluetooth chip
In order to ensure each chip has a label signal, RSSI algorithm and distance signal is cooperated to calculate, increase positioning precision and
Stability.
Further, please refer to Fig. 1 and Fig. 4, the audio-frequency module include be set to it is on search and rescue intelligent helmet, be used for
Realize dialogue function loudspeaker 21 and recording microphone 22, the audio coding chip for carrying out noise reduction to the audio that is exported,
The audio public affairs handled for the volume to exported audio put chip；The audio-frequency module further includes being set to search and rescue intelligence
On the energy helmet, for opening the dialogue key 23 of dialogue function；Loudspeaker 21, recording microphone 22, audio coding chip, audio are public
It puts chip and dialogue key 23 is connected to control module；In the present embodiment, the dialogue key is secondary or physical bond；As people to be rescued
It when member presses dialogue key, searches and rescues and is opened with the dialogue function of intelligent helmet, recording microphone and loudspeaking can be passed through to rescue personnel
Device realizes dialogue function, and audio-frequency information first passes through audio coding chip and carries out noise reduction, then is transmitted to control module, and control module is logical
It crosses 433 chip of double frequency and Bluetooth chip forwards audio-frequency information, wait for realizing dialogue function between rescue personnel with another one, it is another
After rescue personnel receives audio-frequency information, audio-frequency information is put after chip is adjusted volume using audio public affairs for position, is passed through
The broadcasting of loudspeaker progress audio-frequency information.
Further, Fig. 1 and Fig. 5 are please referred to, is additionally provided in the helmet main body for being attached with external equipment
Interface module；The interface module include projector's interface 31 for being attached with outer projections equipment and for it is outer
The light units interface that portion's light units are attached, projector's interface 31 and light units interface are connected to control mould
Block；In other embodiments, microcam and record key 32 can be set in helmet main body, record key 32 and miniature taken the photograph
Camera is connected to control module, and record key 32 is secondary or physical bond；Press record key, microcam to the scene of the accident into
Row shooting；After rescue personnel is rescued, external staff can connect projector by projector's interface, reproducible accident occur
Scene occurs, accident occurrence cause is further appreciated that.
Further, referring to Fig. 1, the lighting module includes the headlamp for being set to search and rescue intelligent helmet front end
(not shown) and the headlamp switch key 41 opened and closed for controlling headlamp, the headlamp pass through light units
Interface is connected to control module, and headlamp switch key 41 is connected to control module；In the present embodiment, the headlamp can with but
It is not limited to LED light, the headlamp switch key is secondary or physical bond.
Further, the alarm module for realizing emergency alarm, the alarm mould are additionally provided in the helmet main body
Block is connected to control module；In the present embodiment, the alarm module is the alarm key 51 being set in helmet main body 1, report
Alert key 51 is secondary or physical bond.
Further, it is additionally provided in the helmet main body for needing rescue worker and be not required to rescue worker and distinguish
Personnel check module, the personnel check module and are connected to control module.
Further, it is impacted degree for detecting to rescue personnel referring to Fig. 2, being additionally provided in the helmet main body
Shock induction module, the shock induction module is connected to control module；In the present embodiment, the shock induction module packet
Include the thin-film pressure sensor equably, being circumferentially set on helmet main body outer edge；When the helmet experiences shock, respectively
The detected pressure value reached is fed back to control module by a thin-film pressure sensor, and control module is according to collected information
Judge to rescue personnel by the severity hit.
Further, it includes gravity sensor that the personnel, which check module, and the gravity sensor is connected to control module；
When rescue personnel is in rubble, 433 chip of double frequency is using detouring and penetrate two functions, at this point, gravity sensor
Signal can be shielded, if not including gravity sensor in 433 location signal of double frequency that rescue worker is received by mobile device
Signal determines the personnel then to need rescue personnel；If 433 location signal of double frequency includes gravity sensor signal, determining should
Personnel are to be not required to rescue personnel, improve the rescue speed and rescue accuracy of rescue worker, and improve survive to a certain extent
Rate.
Referring to Fig. 6, the present invention has also correspondingly provided a kind of communication system based on above-mentioned search and rescue intelligent helmet, packet
Search and rescue intelligent helmet and mobile device are included, the search and rescue carry out letter by wireless communication module and mobile device with intelligent helmet
Breath exchange；In the present embodiment, the wireless communication module can be, but not limited to be Bluetooth chip；By the communication system, rescue
The personnel of helping can be understood by mobile device to the location information of rescue personnel, heart rate information, the strength information that is impacted, gravity sensitive
Device signal etc. determines the rescue sequence to rescue personnel convenient for rescue worker, realizes effective quick progress of pick-up operation；This
Outside, in certain distance (related with the performance of 433 chip of double frequency and RF power amplification chip), to can be by searching between rescue personnel
It rescues and realizes communication with intelligent helmet, improve a possibility that saving oneself.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these replacements or change all should belong to claims appended hereto
Protection scope in.
Claims (10)
1. a kind of search and rescue uses intelligent helmet, including helmet main body, which is characterized in that be provided in the helmet main body
For coordinating and controlling the control module of search and rescue intelligent helmet overall work；
For providing the power module of burning voltage with intelligent helmet overall work for search and rescue；
For realizing the audio-frequency module of broadcast and dialogue function；
Wireless communication module for being communicated with external equipment；
The locating module confirmed for treating rescue personnel position；
For incuding the life induction module to rescue personnel's vital sign；
For realizing the lighting module of illumination functions；
The switch key opened and stopped working for controlling search and rescue intelligent helmet；
The power module, audio-frequency module, wireless communication module, locating module, life induction module, lighting module and switch are pressed
Key is connected to control module.
2. a kind of search and rescue according to claim 1 uses intelligent helmet, which is characterized in that the locating module includes double frequency
433 chips and RF power amplification chip, 433 chip of double frequency and RF power amplification chip are connected to control module.
3. a kind of search and rescue according to claim 1 uses intelligent helmet, which is characterized in that the audio-frequency module includes being set to
Search and rescue are translated on intelligent helmet for realizing the loudspeaker of dialogue function and recording microphone, the audio for carrying out noise reduction to audio
Code chip, the audio public affairs for being handled output volume put chip；The audio-frequency module further includes being set to search and rescue intelligence
On the energy helmet, for opening the dialogue key of dialogue function；The loudspeaker, recording microphone, audio coding chip, audio public affairs are put
Chip and dialogue key are connected to control module.
4. it is according to claim 1 it is a kind of search and rescue use intelligent helmet, which is characterized in that further include be used for and external equipment into
The interface module of row connection；The interface module includes projector's interface for being attached with outer projections equipment and is used for
The light units interface being attached with external lights equipment, projector's interface and light units interface are connected to control
Molding block.
5. a kind of search and rescue according to claim 4 uses intelligent helmet, which is characterized in that the lighting module includes being set to
The headlamp of search and rescue intelligent helmet front end and the headlamp switch key opened and closed for controlling headlamp, the headlamp
It is connected to control module by light units interface, the headlamp switch key is connected to control module.
6. a kind of search and rescue according to claim 1 uses intelligent helmet, which is characterized in that further include for realizing emergency alarm
Alarm module, the alarm module is connected to control module.
7. a kind of search and rescue according to claim 2 uses intelligent helmet, which is characterized in that further include for needing rescue worker
Module is checked with the personnel that rescue worker distinguishes are not required to, the personnel check module and are connected to control module.
8. a kind of search and rescue according to claim 6 uses intelligent helmet, which is characterized in that further include for detecting people to be rescued
Member is impacted the shock induction module of degree, and the shock induction module is connected to control module.
9. a kind of search and rescue according to claim 7 uses intelligent helmet, which is characterized in that it includes weight that the personnel, which check module,
Force snesor, the gravity sensor are connected to control module.
10. a kind of communication system based on the described in any item search and rescue intelligent helmets of claim 1-9, which is characterized in that packet
Search and rescue intelligent helmet and mobile device are included, the search and rescue carry out letter by wireless communication module and mobile device with intelligent helmet
Breath exchange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910623766.8A CN110403289A (en) | 2019-07-11 | 2019-07-11 | Intelligent helmet is used in a kind of search and rescue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910623766.8A CN110403289A (en) | 2019-07-11 | 2019-07-11 | Intelligent helmet is used in a kind of search and rescue |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110403289A true CN110403289A (en) | 2019-11-05 |
Family
ID=68361013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910623766.8A Pending CN110403289A (en) | 2019-07-11 | 2019-07-11 | Intelligent helmet is used in a kind of search and rescue |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013057745A1 (en) * | 2011-10-18 | 2013-04-25 | Brooklin S.R.L. | Multifunction protective helmet |
| CN103501336A (en) * | 2013-09-30 | 2014-01-08 | 东北大学 | Internet-of-things-based rescuer safety protection and monitoring system and method |
| CN104660995A (en) * | 2015-02-11 | 2015-05-27 | 尼森科技（湖北）有限公司 | Disaster relief visual system |
| CN207125382U (en) * | 2017-09-08 | 2018-03-23 | 宁波市众环智能科技发展有限公司 | A kind of intelligent search and rescue device |
| CN108294391A (en) * | 2018-04-20 | 2018-07-20 | 张丝敏 | A kind of crash helmet or cap |
| CN211833041U (en) * | 2019-07-11 | 2020-11-03 | 汇盈讯科智能科技(佛山市)有限责任公司 | Search for and rescue and use intelligent helmet and communication system |
-
2019
- 2019-07-11 CN CN201910623766.8A patent/CN110403289A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013057745A1 (en) * | 2011-10-18 | 2013-04-25 | Brooklin S.R.L. | Multifunction protective helmet |
| CN103501336A (en) * | 2013-09-30 | 2014-01-08 | 东北大学 | Internet-of-things-based rescuer safety protection and monitoring system and method |
| CN104660995A (en) * | 2015-02-11 | 2015-05-27 | 尼森科技（湖北）有限公司 | Disaster relief visual system |
| CN207125382U (en) * | 2017-09-08 | 2018-03-23 | 宁波市众环智能科技发展有限公司 | A kind of intelligent search and rescue device |
| CN108294391A (en) * | 2018-04-20 | 2018-07-20 | 张丝敏 | A kind of crash helmet or cap |
| CN211833041U (en) * | 2019-07-11 | 2020-11-03 | 汇盈讯科智能科技(佛山市)有限责任公司 | Search for and rescue and use intelligent helmet and communication system |
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