CN201413563Y - Earthquake-sound, geomagnetic and earthquake motion anti-interference earthquake precaution device - Google Patents
Earthquake-sound, geomagnetic and earthquake motion anti-interference earthquake precaution device Download PDFInfo
- Publication number
- CN201413563Y CN201413563Y CN2009200139004U CN200920013900U CN201413563Y CN 201413563 Y CN201413563 Y CN 201413563Y CN 2009200139004 U CN2009200139004 U CN 2009200139004U CN 200920013900 U CN200920013900 U CN 200920013900U CN 201413563 Y CN201413563 Y CN 201413563Y
- Authority
- CN
- China
- Prior art keywords
- earthquake
- circuit
- alert
- signal
- sounds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses an earthquake-sound, geomagnetic and earthquake motion anti-interference earthquake precaution device, which consists of an earthquake sound detection, a geomagnetic detection, an earthquake detection, an AC voltage regulation power source and a starting delay circuit, wherein the earthquake sound detection comprises an earthquake sound sensor, a calculation amplifier,a band-pass filter, a secondary calculation amplifier, an active rectifier, a threshold value adjusting and shaping circuit, an earthquake identification circuit, a tocsin-earthquake-sound switchover,tocsin power amplifier and tocsin switching circuit; the geomagnetic detection comprises a magnetic sensor, a calculation amplification anti-interference circuit, a flexibility adjusting circuit, a window comparator, a tocsin switching circuit and a tocsin power amplifier; and the earthquake motion detection comprises an earthquake motion sensor, a calculation amplification anti-interference circuit, a flexibility adjusting circuit, a window comparator, a tocsin switching circuit and a tocsin amplifier.
Description
Technical field
The utility model relates to a kind of earthquake early-warning device, particularly a kind of earthquake sounds, earth magnetism, the anti-interference earthquake early-warning device of earthquake motion.
Background technology
Earthquake causes serious life and property loss, and providing practical earthquake pre-warning product to society is an effective protection against and mitigation of earthquake disasters measure, is the needs of social stability of benefiting the nation and the people.The most performance of existing in the market earthquake Alarm is single, reliability and anti-interference are poor.Ground acoustic alarm design in the past is to bore deep-well mostly, and is moving then more than hundred meters, waste financial resources, say and bore deep-well nothing more than mainly being anti-interference from adopting angle in fact, it is not too big with difference on the ground to adopt the underground hundreds of rice of sound, because compare with the seismic origin degree of depth, hundred meters degree of depth can be ignored.We know, are easier to survey and valuable earthquake precursors mainly contains three kinds by the prior art ratio: earthquake sounds, earth magnetism, earthquake motion, if can fully utilize, can improve the early warning performance.
Summary of the invention
The purpose of this utility model is to provide a kind of earthquake sounds, earth magnetism, the anti-interference earthquake early-warning device of earthquake motion, and it has fully utilized three kinds of omens of earthquake, thereby reaches early warning effect preferably.
The technical solution of the utility model is as follows:
A kind of earthquake sounds, earth magnetism, the anti-interference earthquake early-warning device of earthquake motion, by the ground acoustic detection, magnetic detection, earthquake motion detection, alternating current steady voltage plug, start delay circuit form, wherein:
Earthquake sounds are surveyed and are comprised the earthquake sounds sensor, operational amplifier, bandpass filter, two-level operating amplifier, active rectification, threshold values is adjusted and shaping circuit, the earthquake sounds identification circuit, alert sound earthquake sounds switch, alert sound power amplifier and alert acoustic(al) switch circuit, the signal that the ground sonic transducer produces outputs to the operational amplifier inverting input, amplify after bandpass filter is input to the in-phase input end of two-level operating amplifier, the ground acoustical signal of output is connected to threshold values adjustment and shaping circuit through active rectification, behind the earthquake sounds identification circuit, connect alert sound earthquake sounds and switch, alert sound power amplifier and alert acoustic(al) switch circuit;
Earth magnetism is surveyed and is comprised geomagnetic sensor, computing amplification anti-jamming circuit and sensitivity adjustment, window comparator, alert acoustic(al) switch circuit and alert sound power amplifier, the signal that geomagnetic sensor produces is the input window comparer after anti-jamming circuit and sensitivity adjustment are amplified in computing, and the ground magnetic signal of output connects alert acoustic(al) switch circuit and alert sound power amplifier;
Earthquake motion is surveyed and is comprised earthquake motion sensor, computing amplification anti-jamming circuit and sensitivity adjustment, window comparator, alert acoustic(al) switch circuit and alert sound power amplifier, the signal that the earthquake motion sensor produces is the input window comparer after anti-jamming circuit and sensitivity adjustment are amplified in computing, and the earthquake motion signal of output connects alert acoustic(al) switch circuit and alert sound power amplifier;
Alternating current steady voltage plug, 220V alternating current connect three terminal regulator behind rectification circuit, filter capacitor after the transformer step-down, connect filter capacitor after the voltage stabilizing again;
The start delay circuit is made up of V6, V7, V8, C26, R43, R44, R45, R46, D17, and C26 connects the V8 base stage through R46, the V8 collector connects the V7 base stage, the V7 collector connects the V6 base stage through R43, and the V7 base stage connects the V6 base stage through R45, R44, and C26 is through D17 plus earth.
Advantage of the present utility model is: 1, it is made up of three kinds of early warning signals, in the close time period, when two or more signal early warning, just causes people's attention; 2, the sonic transducer probe portion can receive vibration signal except the ground sonic transducer, also adopts the earthquake sounds identification circuit, and automatically switches to the identification of manually checking on, strong anti-interference performance; 3, deep-well be needn't bore, manpower, financial resources, material resources alleviated; 4, the earthquake sounds probe portion plays blocking effect to the sound signal of conducting in the air; 5, geomagnetic sensor changes responsive to the size and Orientation of terrestrial magnetic field.6, use universal elements, cost of manufacture is low, the cost performance height.
Description of drawings
Fig. 1 is the utility model one-piece construction block scheme;
Fig. 2 is the utility model circuit theory diagrams.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
Can see structure of the present utility model by Fig. 1, a kind of earthquake sounds, earth magnetism, the anti-interference earthquake early-warning device of earthquake motion, by the ground acoustic detection, the ground magnetic detection, earthquake motion detection and alternating current steady voltage plug, the start delay circuit is formed, wherein earthquake sounds are surveyed and are comprised the earthquake sounds sensor, operational amplifier, bandpass filter, two-level operating amplifier, active rectification, threshold values is adjusted and shaping circuit, the earthquake sounds identification circuit, alert sound earthquake sounds switch, alert sound power amplifier and alert acoustic(al) switch circuit, earth magnetism is surveyed and is comprised geomagnetic sensor, anti-jamming circuit and sensitivity adjustment are amplified in computing, window comparator, alert acoustic(al) switch circuit and alert sound power amplifier, earthquake motion is surveyed and is comprised the earthquake motion sensor, anti-jamming circuit and sensitivity adjustment are amplified in computing, window comparator, alert acoustic(al) switch circuit and alert sound power amplifier.
As shown in Figure 2, the earthquake sounds probe portion, the signal that ground sonic transducer B produces is through capacitor C 1, resistance R 2 is coupled to amplifier A1 inverting input, after amplifying again via R6, R7, R8, C3, C4, the bandpass filter that A2 forms, filter out the high low side sound signal except that the ground acoustical signal, the in-phase input end that outputs to A3 carries out secondary and amplifies, the output terminal of A3 is via capacitor C 6, resistance R 11, R12, R13, R14, R15, A4, the active rectifying circuit that A5 forms connects the inverting input of A6, R17 connects the in-phase input end of A6, constitute threshold values adjustment and shaping circuit, the A6 output terminal connects the V1 base stage through capacitor C 7, V1, N1, V2 constitutes the earthquake sounds identification circuit, make discontinuous wave, various interference wave blocking-up, wherein N1 is the NE555 integrated circuit, this circuit is connected into the delay monostable multivibrator circuit, input signal connects the pin 2 of N1 through transistor V1 collector, playing paraphase triggers, the pin 3 of N1 connects the base stage of V2 through resistance R 23, at measuring-signal waveform V1 current collection very between high period, V2 equals to add collector voltage, this moment, N1 was set, pin 3 also is a high level, the V2 base stage is biased simultaneously, therefore V2 current collection low level very between detection period, when delay width that the width of detected input signal is set greater than N1, the V2 collector applies the time of voltage greater than the base bias time, V2 collector output high level, measured signal this moment belongs to continuous wave, at this moment V2 collector one tunnel promotes luminotron D14, D14 is by R36 ground connection, produce voltage drop, the base stage that connects V5 through R37, the V5 collector is through R39 to V4 base stage, the collector of V4 connects the pin 6 of power amplifier N4, be the N4 power supply, the collector of V4 behind decoupling capacitor C22 again through divider resistance R40, the power end that connects alert sound sounding piece N3 after the R41 dividing potential drop, be connected with resistance R 42 on the N3, work the sound speed effect of regulating, the N3 output terminal is through the pin 3 of capacitor C 24 to N4, the pin 5 of N4 is through C25, loudspeaker BL ground connection, another Lu Zhikang moment the capacitor C 10 of suddenling change, connect C11 through R24, charge to C11, charging current promotes the V3 conducting, D1 is a fly-wheel diode, V3 through relay K to power supply 9V, K contact S movable end and lower end are connected, send chimes of doom, crossing left and right sides C11 charging in three seconds behind the alert sound prompting field staff finishes, duration of charging is by C11, the R24 decision, K discharges, the S end is connected with upper end C2 negative terminal again, the doubtful ground acoustical signal that the loudspeaker BL scene of sending is exaggerated, field staff's ear of choosing is again judged the true and false, as making a final check, take corresponding measure again.
The earth magnetism probe portion, geomagnetic sensor L1 is through coupling capacitance C17, resistance R 26 connects the inverting input of A7, connect C18 and R27 between the inverting input of A7 and the output terminal, C18 plays anti-interference effect, R27 plays the threshold values corrective action, be divided into different gears by earthquake intensity in actual applications, the output terminal of A7 connects by R28, R29, D8, D9, A8, A9, D10, the window comparator that D11 forms, promote luminotron D15, D15 is by R36 ground connection, produce voltage drop, through the base stage of R37 connection V5, the V5 collector is through R39 to V4 base stage, and the collector of V4 connects the pin 6 of power amplifier N4, be the N4 power supply, the collector of V4 behind decoupling capacitor C22 again through divider resistance R40, connect the power end of alert sound sounding piece N3 after the R41 dividing potential drop, be connected with resistance R 42 on the N3, work the sound speed effect of regulating, the N3 output terminal is through the pin 3 of capacitor C 24 to N4, and the pin 5 of N4 is through C25, loudspeaker BL ground connection.
The earthquake motion probe portion, earthquake motion sensor L2 is through capacitor C 21, resistance R 30 connects the inverting input of A10, connect C20 and R31 between the inverting input of A10 and the output terminal, C20 plays anti-interference effect, R31 plays the threshold values corrective action, be divided into different gears by earthquake intensity in actual applications, the output terminal of A10 connects by R32, R33, R34, R35, A11, A12, D12, the window comparator that D13 forms, promote luminotron D16, D16 is by R36 ground connection, produce voltage drop, through the base stage of R37 connection V5, the V5 collector is through R39 to V4 base stage, and the collector of V4 connects the pin 6 of power amplifier N4, be the N4 power supply, the collector of V4 behind decoupling capacitor C22 again through divider resistance R40, connect the power end of alert sound sounding piece N3 after the R41 dividing potential drop, be connected with resistance R 42 on the N3, work the sound speed effect of regulating, the N3 output terminal is through the pin 3 of capacitor C 24 to N4, and the pin 5 of N4 is through C25, loudspeaker BL ground connection.
The start delay circuit, form by V6, V7, V8, C26, R43, R44, R45, R46, D17, C26 connects the V8 base stage through R46, the V8 collector connects the V7 base stage, the V7 collector connects the V6 base stage through R43, and the V7 base stage connects the V6 base stage through R45, R44, and C26 is through D17 plus earth, play discharge process, charging rate is determined by C26, R46.When turning on the power switch K1, the 9V stabilized voltage supply is charged to C26 by R46, V8 base stage and emitter, V8 conducting between charge period, and V6, V7 end, and after the C26 charging finished, V8 ended, V6, V7 conducting, deferring procedure finishes.
Alternating current steady voltage plug part, 220V alternating current are after transformer T step-down, through rectification circuit D3-7 rectification, connect three terminal regulator N2 again after C14, C15 filtering, N2 is LM7809, again by C12, C13 filtering, supply with whole device stabilized power source, R25, D2 are the 9V indicator light circuits.
At the earthquake sounds probe portion, because common rectifying tube has the 0.6V tube voltage drop, thus bigger to the semaphore request amplitude, so select active rectifying circuit.The observed result of earthquake sounds threshold value setting during with reference to the Tangshan aftershock, promptly loudness can reach about 80 decibels near the earthquake epicenter, 3 grades of left and right sides of omen earthquake sounds in the well.Shaping circuit can be a digital signal with analog signal conversion.The pin 3 of N2 is given ground sonic transducer power supply through biasing resistance R1.
It is LM324 that each integrated circuit of the utility model can adopt following model: A1-A12 in the specific implementation, and N1 is NE555, and N2 is LM7809, and N3 is KD-9561, and N4 is LM386.
Earthquake sounds sensor production: punch at reinforcing bar one end vertical centre with drill bit, be subjected to the Electret condenser microphone that has welded shielding line words to be placed on the inside in facing, put microphone afterbody in the hole into spring again, shielding line is worn out from the punching of reinforcing bar side, pound in the hand-hole gently with the plastics disk at last and seal, again wire hole is sealed.
Geomagnetic sensor is made: iron core is removed a character segment, get final product with the electromagnetic wire coiling.
The earthquake motion sensor production: with electromagnetic wire coiling hollow coil, profile is made disc, hangs over that magnet places the hollow coil top on the casing.
When earthquake sounds take place, because earthquake sounds are continuous waves, after the waveform width surpasses setting value, D14 is luminous, and BL sends chimes of doom, and reporting to the police after having spent about 3 seconds stops, transfer the doubtful ground acoustical signal that is exaggerated at once, take corresponding measure through field staff's ear judgement of choosing again.
When earth magnetism takes place, because the geomagnetic sensor magnetic field detection is towards the earth, sensor produces induced signal, D15 is luminous, BL reports to the police, preceding 13 minutes discovery compass deflection phenomenons take place with reference to 5.12 violent earthquakes of Beichuan middle school, Wenchuan in threshold values, and compass magnetic field is about 30-100 Gauss at this moment, and the terrestrial magnetic field changes must compass deflection could take place greater than this magnetic field.
When earthquake motion takes place, because the buffer action of extension spring is arranged, inductive coil and magnet produce motion mutually, in inductive coil, produce signal, owing to adopt the compressional wave signal alarm, this 10-30 can in time report to the police in the time about second in advance before shear wave arrives, and helps like this reducing injures and deaths in face of the terrible disaster.
The ground sonic transducer is owing to adopt ferrous materials and sealing, can only receive the signal that vibration produces, insensitive to the signal of spatial transmission, but high to vibration signal sensitivity, because ferrous materials propagation speed of sound is higher, can accomplish at every moment to catch the sound of the earth again.Geomagnetic sensor adopts electromagnet structure, the magnetic direction variable signal is produced principle is: when magnetic direction is consistent with sensor iron core direction, earth magnetism is the most weak to the induced signal of sensor, when the iron core direction of magnetic direction and sensor differs 90 when spending, stronger to the sensor sensing signal, because such variation has been arranged, when the deflection terrestrial magnetic field, sensor has just produced induced signal.The earthquake motion sensor does not produce false alarm through the utilization and operation reliability is very desirable for many years, and 5.9 grades of earthquakes take place Chifeng City, the Inner Mongol in August, 2003 Balin Left Banner, instant alarming, and this technology belongs to contactless operation, has solved the bad drawback of contact in the long-term work.
Claims (2)
1, a kind of earthquake sounds, earth magnetism, the anti-interference earthquake early-warning device of earthquake motion is characterized in that: by the ground acoustic detection, magnetic detection, earthquake motion detection, alternating current steady voltage plug, start delay circuit form, wherein
Earthquake sounds are surveyed and are comprised the earthquake sounds sensor, operational amplifier, bandpass filter, two-level operating amplifier, active rectification, threshold values is adjusted and shaping circuit, the earthquake sounds identification circuit, alert sound earthquake sounds switch, alert sound power amplifier and alert acoustic(al) switch circuit, the signal that the ground sonic transducer produces outputs to the operational amplifier inverting input, amplify after bandpass filter is input to the in-phase input end of two-level operating amplifier, the ground acoustical signal of output is connected to threshold values adjustment and shaping circuit through active rectification, behind the earthquake sounds identification circuit, connect alert sound earthquake sounds and switch, alert sound power amplifier and alert acoustic(al) switch circuit;
Earth magnetism is surveyed and is comprised geomagnetic sensor, computing amplification anti-jamming circuit and sensitivity adjustment, window comparator, alert acoustic(al) switch circuit and alert sound power amplifier, the signal that geomagnetic sensor produces is the input window comparer after anti-jamming circuit and sensitivity adjustment are amplified in computing, and the ground magnetic signal of output connects alert acoustic(al) switch circuit and alert sound power amplifier;
Earthquake motion is surveyed and is comprised earthquake motion sensor, computing amplification anti-jamming circuit and sensitivity adjustment, window comparator, alert acoustic(al) switch circuit and alert sound power amplifier, the signal that the earthquake motion sensor produces is the input window comparer after anti-jamming circuit and sensitivity adjustment are amplified in computing, and the earthquake motion signal of output connects alert acoustic(al) switch circuit and alert sound power amplifier;
Alternating current steady voltage plug, 220V alternating current connect three terminal regulator behind rectification circuit, filter capacitor after the transformer step-down, connect filter capacitor after the voltage stabilizing again;
The start delay circuit is made up of V6, V7, V8, C26, R43, R44, R45, R46, D17.
2, a kind of earthquake sounds according to claim 1, earth magnetism, the anti-interference earthquake early-warning device of earthquake motion, it is characterized in that: the ground sonic transducer is made up of reinforcing bar, microphone in the body, spring, shielding line and plastics disk, shielding line is welded on the microphone in the body, microphone in the body is positioned at reinforced hole, and the microphone afterbody has spring and plastics disk in the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200139004U CN201413563Y (en) | 2009-05-20 | 2009-05-20 | Earthquake-sound, geomagnetic and earthquake motion anti-interference earthquake precaution device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200139004U CN201413563Y (en) | 2009-05-20 | 2009-05-20 | Earthquake-sound, geomagnetic and earthquake motion anti-interference earthquake precaution device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201413563Y true CN201413563Y (en) | 2010-02-24 |
Family
ID=41715444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200139004U Expired - Fee Related CN201413563Y (en) | 2009-05-20 | 2009-05-20 | Earthquake-sound, geomagnetic and earthquake motion anti-interference earthquake precaution device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201413563Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354434A (en) * | 2011-11-01 | 2012-02-15 | 贵州大学 | Wireless intelligent monitoring and early-warning method and device for slope geological hazard based on acoustic emission |
| CN103048682A (en) * | 2011-10-16 | 2013-04-17 | 义乌震星地质勘探仪器有限公司 | Multi-method starting device for collecting seismic data |
| CN103048681A (en) * | 2011-10-15 | 2013-04-17 | 义乌震星地质勘探仪器有限公司 | Seismic data collection starter capable of setting threshold value |
| CN103064105A (en) * | 2012-12-27 | 2013-04-24 | 辽宁工程技术大学 | Earthquake monitor in mine area |
| CN103197342A (en) * | 2013-04-02 | 2013-07-10 | 徐万洪 | Seismic monitoring and pre-warning circuit |
| CN105590456A (en) * | 2016-03-01 | 2016-05-18 | 深圳先进技术研究院 | Geomagnetic threshold value adjusting method and geomagnetic threshold value adjusting system |
| CN105629326A (en) * | 2015-12-28 | 2016-06-01 | 太原理工大学 | Micro-seismic monitoring sensor |
| CN104181578B (en) * | 2013-05-24 | 2017-09-29 | 北京嘉岳同乐极电子有限公司 | earthquake detection system and detection method |
-
2009
- 2009-05-20 CN CN2009200139004U patent/CN201413563Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048681A (en) * | 2011-10-15 | 2013-04-17 | 义乌震星地质勘探仪器有限公司 | Seismic data collection starter capable of setting threshold value |
| CN103048681B (en) * | 2011-10-15 | 2016-06-22 | 山西晋明海科技开发有限公司 | The seismic data collection starter that threshold value can be arranged |
| CN103048682A (en) * | 2011-10-16 | 2013-04-17 | 义乌震星地质勘探仪器有限公司 | Multi-method starting device for collecting seismic data |
| CN102354434A (en) * | 2011-11-01 | 2012-02-15 | 贵州大学 | Wireless intelligent monitoring and early-warning method and device for slope geological hazard based on acoustic emission |
| CN103064105A (en) * | 2012-12-27 | 2013-04-24 | 辽宁工程技术大学 | Earthquake monitor in mine area |
| CN103064105B (en) * | 2012-12-27 | 2015-06-17 | 辽宁工程技术大学 | Earthquake monitor in mine area |
| CN103197342A (en) * | 2013-04-02 | 2013-07-10 | 徐万洪 | Seismic monitoring and pre-warning circuit |
| CN104181578B (en) * | 2013-05-24 | 2017-09-29 | 北京嘉岳同乐极电子有限公司 | earthquake detection system and detection method |
| CN105629326A (en) * | 2015-12-28 | 2016-06-01 | 太原理工大学 | Micro-seismic monitoring sensor |
| CN105590456A (en) * | 2016-03-01 | 2016-05-18 | 深圳先进技术研究院 | Geomagnetic threshold value adjusting method and geomagnetic threshold value adjusting system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201413563Y (en) | Earthquake-sound, geomagnetic and earthquake motion anti-interference earthquake precaution device | |
| CN202189153U (en) | Underground pipeline detecting instrument | |
| CN102984377A (en) | Smart phone with earthquake early warning function and early warning method thereof | |
| US6097296A (en) | Apparatus and method for detecting tornadoes | |
| CN105160822A (en) | Early earthquake early warning apparatus with acousto-optic short-term memory | |
| CN201229646Y (en) | Earthquake pre-warning apparatus triggered by magnetic needle induced geomagnetic variation | |
| CN201885794U (en) | Intelligent external-force-damage prevention online monitoring device for transmission lines | |
| CN102279413B (en) | Earthquake alarm | |
| CN205982656U (en) | Earthquake warning device of application laser and overlength optic fibre | |
| KR102183039B1 (en) | Alarm device with non-directional vibration detection function and vibration analysis function, and handrail including the same | |
| CN2241346Y (en) | Advanced alarm device for seism | |
| CN205450298U (en) | Life information detection instrument | |
| CN111551982A (en) | Earthquake pre-alarm | |
| CN203562074U (en) | Simple household earthquake alarm | |
| CN105824043A (en) | Optical fiber-buried laser light source earthquake alarming device | |
| CN103382743B (en) | Based on constructure shakeproof system and the induction control method thereof of magnetic control shape memory alloy | |
| CN106226825A (en) | A kind of metal detecting device | |
| CN205692338U (en) | A kind of earthquake alarming device utilizing overlength optical fiber light path to monitor | |
| CN203870766U (en) | Cutting-magnetic-line earthquake alarm device | |
| CN105336112A (en) | Civil earthquake alarm | |
| CN204348031U (en) | High-rise residential building earthquake monitor alarm device in early stage | |
| CN205508071U (en) | Magnetic suspension earthquake detector | |
| CN205281711U (en) | Resident family's distress system of talkbacking | |
| CN2218932Y (en) | Household earthquake alarm | |
| CN104282116B (en) | High-rise residential building earthquake early stage monitor alarm device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100224 Termination date: 20110520 |