CN212207692U - Gas pipeline earthquake emergency treatment device - Google Patents
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- CN212207692U CN212207692U CN202020933987.3U CN202020933987U CN212207692U CN 212207692 U CN212207692 U CN 212207692U CN 202020933987 U CN202020933987 U CN 202020933987U CN 212207692 U CN212207692 U CN 212207692U
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Abstract
The utility model provides a gas pipeline earthquake emergency treatment device, which comprises an MCU, a triaxial acceleration sensor, a valve closing sub-circuit, an electric valve with a shut-off pipeline part and a communication sub-circuit; the output end of the triaxial acceleration sensor is respectively and electrically connected with the GPIO port and the interrupt port of the MCU; the MCU is electrically connected with the input end of the valve closing sub-circuit; the MCU is also electrically connected with the communication sub-circuit; the output end of the valve closing sub-circuit is electrically connected with the input end of the electric valve, and the feedback signal end of the electric valve is electrically connected with the input end of the MCU; the three-axis acceleration sensor detects the vibration acceleration of the pipeline and sends the acceleration detection result to the MCU; the MCU opens the valve closing sub-circuit and the communication sub-circuit and executes the action of locally closing the valve, and the MCU can also communicate with the communication sub-circuit of the nearby adjacent gas pipeline earthquake emergency treatment device or a remote main station through the communication sub-circuit.
Description
Technical Field
The utility model belongs to the technical field of the seismic detection technique and specifically relates to a gas pipeline earthquake promptly deals with device is related to.
Background
The understanding of our country on the earthquake emergency disposal system of the gas system is as early as 2000 years, the enlightenment of the earthquake damage of the urban lifeline system is obtained from the experience of the earthquake damage of the osaka deity earthquake lifeline in japan, and the recognition that the earthquake safety control and the emergency disposal are more effective disaster reduction approaches. With the gradual enhancement of consciousness of disaster prevention and reduction, people analyze earthquake damage of a gas system, research and develop products such as mechanical earthquake pipeline valves and the like in a targeted manner, and when an earthquake occurs, the mechanical structure is utilized to close a gas pipeline, so that economic loss and secondary disasters caused by the earthquake are reduced.
However, the existing earthquake pipeline disaster prevention and reduction products have the defects that the threshold value of the trigger valve arranged on the full-mechanical earthquake pipeline valve is single, automatic control cannot be realized, misoperation and damage are easy to generate, long-term manual monitoring and field maintenance are needed, and installation and maintenance are not convenient enough.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a can detect seismic signal and reliably turn off gas pipeline's gas pipeline earthquake emergency treatment device.
The technical scheme of the utility model is realized like this: the utility model provides a gas pipeline earthquake promptly deals with device, its characterized in that: the device comprises an MCU (1), a triaxial acceleration sensor (2), a valve closing sub-circuit (3), an electric valve (4) with a pipeline closing part and a communication sub-circuit (5);
the output end of the triaxial acceleration sensor (2) is respectively and electrically connected with the GPIO port and the interrupt port of the MCU (1); the MCU (1) is electrically connected with the input end of the valve closing sub-circuit (3); the MCU (1) is also electrically connected with the communication sub-circuit (5); the output end of the valve closing sub-circuit (3) is electrically connected with the input end of the electric valve (4), and the feedback signal end of the electric valve (4) is electrically connected with the input end of the MCU (1);
the three-axis acceleration sensor (2) detects the vibration acceleration of the pipeline and sends the acceleration detection result to the MCU (1); the MCU (1) enters a working state and opens the valve closing sub-circuit (3) and the communication sub-circuit (5) according to an acceleration detection result, the valve closing sub-circuit (3) starts the electric valve (4) and executes the action of closing the valve, and the electric valve (4) feeds back the current position information of the closed pipeline part after the action to the MCU (1); the MCU (1) is communicated with a communication sub-circuit (5) of an adjacent gas pipeline earthquake emergency treatment device or a remote main station through the communication sub-circuit (5).
On the basis of the technical scheme, preferably, the SPI ports of the three-axis acceleration sensor (2) are electrically connected with the SPI ports of the MCU (1) in a one-to-one correspondence manner, and the interrupt output end of the three-axis acceleration sensor (2) is electrically connected with the interrupt input end of the MCU (1); and an interrupt signal sent by an interrupt output end of the triaxial acceleration sensor (2) is used as a wake-up signal for the MCU (1) to enter a working state from a dormant standby state.
Preferably, the valve closing sub-circuit (3) comprises a boost chip U1 and a single-channel switch chip U2, the input end of the boost chip U1 is electrically connected with the +3.3V power supply, and the enable end of the boost chip U1 is electrically connected with the GPIO port of the MCU (1); the output end of the voltage boosting chip U1 is electrically connected with the input end and the enabling end of the single-channel switch chip U2, and the output end of the single-channel switch chip U2 is electrically connected with the electric valve (4).
Preferably, the opening position and the closing position of the pipe closing part of the electric valve (4) are both provided with a distance sensor S1, and the output end of the distance sensor S1 is electrically connected with the GPIO port of the MCU (1).
Still further preferably, the communication sub-circuit (5) includes a load switch U3, a level shift chip U4 and an NB-IOT communication unit U5, and an input end of the load switch U3 is electrically connected to a GPIO port of the MCU (1); the power supply input end of the load switch U3 is electrically connected with a +3.3V power supply, and the output end of the load switch U3 is electrically connected with the power supply end of the NB-IOT communication unit U5; the UART port of the MCU (1) and the URART port of the NB-IOT communication unit U5 are respectively electrically connected with the transceiving ports of the level conversion chip U4 in a one-to-one correspondence mode.
On the basis of the technical scheme, the intelligent control system further comprises a rechargeable power supply (6), wherein the rechargeable power supply (6) is electrically connected with the MCU (1), the three-axis acceleration sensor (2), the valve closing sub-circuit (3), the electric valve (4) and the communication sub-circuit (5) respectively.
On the other hand, the utility model also provides a processing method of gas pipeline earthquake emergency processing device, including following step:
s1: the method comprises the following steps that an MCU (1), a triaxial acceleration sensor (2), a valve closing sub-circuit (3), an electric valve (4) with a pipeline closing part and a communication sub-circuit (5) are initialized and configured, so that the electric valve (4) is located at a normally open position, and a gas pipeline supplies gas normally; the MCU (1) and the triaxial acceleration sensor (2) are in a dormant energy-saving state when not working; the triaxial acceleration sensor (2) is provided with a first acceleration threshold value and a second acceleration threshold value;
s2: when the gas pipeline vibrates and exceeds a first acceleration threshold value, the three-axis acceleration sensor (2) is activated and measures acceleration, and when the vibration acceleration detected by the three-axis acceleration sensor (2) is smaller than a second acceleration threshold value, the three-axis acceleration sensor (2) does not output and sleeps again after a period of time delay; when the vibration acceleration detected by the triaxial acceleration sensor (2) is above a second acceleration threshold value, an interrupt output end of the triaxial acceleration sensor (2) sends an interrupt signal to an interrupt input end of the MCU (1), awakens the MCU (1), and sends a vibration acceleration measurement result to the MCU (1) through the SPI port;
s3: the MCU (1) calculates the average value of the vibration acceleration according to the received vibration acceleration measurement result, and judges the earthquake intensity, wherein the average value of the peak acceleration reaches 0.125g and represents the intensity VII level earthquake, and the average value of the peak acceleration reaches 0.25g and represents the intensity VIII level earthquake; the average value of the peak acceleration reaches 0.5g, which represents IX grade earthquake;
s4: the MCU (1) respectively sends out enabling signals to the valve closing sub-circuit (3) and the communication sub-circuit (5) according to the earthquake intensity level, activates the valve closing sub-circuit (3) and the communication sub-circuit (5) and keeps the working state of the sub-circuits;
s5: the valve closing sub-circuit (3) drives the electric valve (4) to close the gas pipeline, and after the electric valve (4) is completely closed, the distance sensor S1 sends a feedback signal of the current position of the pipeline closing part back to the MCU (1); completing the execution process of the shutdown of the local gas pipeline earthquake emergency treatment device, and cutting off the gas supply of the gas pipeline;
s6: the MCU (1) also communicates the vibration acceleration measurement result, the vibration acceleration average value and the earthquake intensity information to a communication sub circuit (5) of an adjacent gas pipeline earthquake emergency treatment device or a remote main station through the communication sub circuit (5), further confirms the earthquake intensity with the adjacent gas pipeline earthquake emergency treatment device or the remote main station to form a majority combination judgment algorithm of a plurality of gas pipeline earthquake emergency treatment devices, and keeps the opening or closing state of each gas pipeline according to the judgment result; if the gas pipeline earthquake emergency disposal devices in the area are N, the remote master station receives earthquake intensity information sent by the M gas pipeline earthquake emergency disposal devices, and when M is larger than or equal to N/2, all the gas pipeline earthquake emergency disposal devices in the area act to cut off the gas pipelines of which the devices are located;
s7: when the three-axis acceleration sensor (2) does not send an interrupt signal to the MCU (1), the MCU (1) is automatically awakened periodically, and the communication sub-circuit (5) is started to actively send a heartbeat data packet in a normal working state to the remote master station.
The utility model provides a pair of gas pipeline earthquake promptly deals with device for prior art, has following beneficial effect:
(1) the utility model realizes the operation state switching of the gas pipeline valve by combining the triaxial acceleration sensor, the MCU and the valve shutoff sub-circuit, is in a dormant energy-saving state when not working or when the triaxial acceleration sensor does not send interrupt signals to the MCU, has lower power consumption, can stably operate for a long time, and avoids the workload of frequent maintenance;
(2) the triaxial acceleration sensor can be internally provided with two-stage vibration accelerator threshold values to prevent the damage of mechanical parts of the valve caused by the misoperation and frequent starting of a valve shutoff sub-circuit and an electric valve;
(3) the MCU can obtain the information detected by the triaxial acceleration sensor, further obtain the average value of the vibration acceleration and the corresponding seismic intensity, and execute corresponding gas pipeline keeping or turning-off measures;
(4) after the pipeline closing part of the electric valve runs to a closing or opening position, position information is sent to the MCU to prompt the MCU that the execution of the countermeasure is finished;
(5) the utility model is provided with a rechargeable power supply, which can be connected into the power grid to charge at ordinary times, and can also provide energy for the earthquake emergency treatment device for a long time when power is cut off or power is interrupted due to earthquake, thereby ensuring long-term stable operation;
(6) the MCU can further communicate with an earthquake emergency treatment device or a remote master station of an adjacent gas pipeline near the communication sub-circuit so as to further confirm whether the equipment has false alarm and whether a shutdown strategy is accurate; namely, the decision reliability of the turn-off action is further improved according to the number of the devices.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, adjacent drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of the structure of an earthquake emergency treatment device for a gas pipeline of the present invention;
FIG. 2 is a wiring diagram of the three-axis acceleration sensor and the MCU of the gas pipeline earthquake emergency treatment device of the present invention;
fig. 3 is a wiring diagram of the valve closing sub-circuit, the electric valve and the MCU of the emergency gas pipeline earthquake treatment device of the present invention;
fig. 4 is the utility model discloses a gas pipeline earthquake promptly deals with MCU and communication sub circuit's wiring diagram.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all the adjacent embodiments obtained by the ordinary skilled person without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the utility model provides a gas pipeline earthquake emergency treatment device, which comprises a MCU1, a triaxial acceleration sensor 2, a valve closing sub-circuit 3, an electric valve 4 with a pipeline cutting-off component, a communication sub-circuit 5 and a rechargeable power supply 6;
the output end of the triaxial acceleration sensor 2 is electrically connected with the GPIO port and the interrupt port of the MCU1 respectively; the MCU1 is electrically connected with the input end of the valve closing sub-circuit 3; the MCU1 is also electrically connected with the communication sub-circuit 5; the output end of the valve closing sub-circuit 3 is electrically connected with the input end of the electric valve 4, and the feedback signal end of the electric valve 4 is electrically connected with the input end of the MCU 1;
the three-axis acceleration sensor 2 detects the vibration acceleration of the pipeline and sends the acceleration detection result to the MCU 1; the MCU1 enters a working state and opens the valve closing sub-circuit 3 and the communication sub-circuit 5 according to an acceleration detection result, the valve closing sub-circuit 3 starts the electric valve 4 and executes the action of closing the valve, and the electric valve 4 feeds back the position information of the closed pipeline part after the action to the MCU 1; the MCU1 communicates through the communication sub-circuit 5 with the communication sub-circuit 5 of a nearby adjacent gas pipeline seismic emergency treatment device or with a remote master station.
The utility model discloses a circuit structure has replaced current pure mechanical type earthquake pipeline valve. The MCU1 is actively awakened by detecting whether the vibration is detected by the three-axis acceleration sensor 2, the MCU1 enters a working state and further analyzes the acceleration detection result sent by the three-axis acceleration sensor 2, determines the intensity of the acceleration detection result, and performs a countermeasure of maintaining the current status of the electric valve 4 or turning off the electric valve 4.
As shown in fig. 2, the SPI ports of the triaxial acceleration sensor 2 and the SPI ports of the MCU1 are electrically connected in a one-to-one correspondence manner, and the terminal output end of the triaxial acceleration sensor 2 is electrically connected to the interrupt input end of the MCU 1. As can be seen from the figure, the triaxial acceleration sensor 2 of the present invention is an ADXL362 sensor of Texas instruments, which is an ultra-low power consumption MEMS accelerometer with built-in AD conversion function, and has adjustable threshold wake-up and sleep modes, and very small volume. The MCU1, which is an ARM Cortex-M3 based processor integrated with power management, may alternatively be the AduCM3029 from Texas instruments, USA. The SCLK, MOSI and/CS ports of the triaxial acceleration sensor 2 are connected with the SPI port of the MCU1, the interrupt output port INT2 of the triaxial acceleration sensor 2 is connected with the interrupt input port of the MCU1, and the high-level or low-level interrupt signal of the port can make the MCU1 enter the wake-up mode from the sleep mode. Of course, the MCU1 can also be a product with adjacent similar functions, such as an STM32 singlechip of semiconductor by Ruyi method.
As shown in fig. 3, the valve closing sub-circuit 3 includes a voltage boost chip U1 and a single-channel switch chip U2, an input terminal of the voltage boost chip U1 is electrically connected to the +3.3V power supply, and an enable terminal of the voltage boost chip U1 is electrically connected to a GPIO port of the MCU 1; the output end of the voltage boosting chip U1 is electrically connected with the input end and the enabling end of the single-channel switch chip U2. As can be seen from the figure, the enable signal output from the pin 41 of the MCU1 enables the boost chip U1 to work normally, thereby achieving voltage boosting. The voltage boost chip U1 can output +12V +30V voltage to the single-channel switch chip U2, and the output terminal of the single-channel switch chip U2 is electrically connected to the electric valve 4. The contacts of the electric valve 4 are powered, so that the shut-off pipe part rotates relative to the gas pipeline, and the gas pipeline is closed or opened. The boosting multiple of the boosting chip U1 can be determined by R1+ R2/R2.
As shown in fig. 3, in order to confirm the actual position of the shut-off pipe member, a distance sensor S1 may be disposed at both the open position and the closed position of the shut-off pipe member of the electric valve 4, the output terminal of the distance sensor S1 is electrically connected to the pin 42 of the MCU1, and the distance sensor S1 may send a position feedback signal back to the MCU 1.
In the utility model, the boost chip U1 can be TPS61096 chip of Texas instruments of America; the single-channel switch chip U2 may be TPS22810 available from Texas instruments, USA. Of course, adjacent chips with similar functions are also possible.
As shown in fig. 4, the communication sub-circuit 5 includes a load switch U3, a level shift chip U4, and an NB-IOT communication unit U5, wherein an input terminal of the load switch U3 is electrically connected to a GPIO port of the MCU 1; the power supply input end of the load switch U3 is electrically connected with a +3.3V power supply, and the output end of the load switch U3 is electrically connected with the power supply end of the NB-IOT communication unit U5; the UART port of the MCU1 and the URART port of the NB-IOT communication unit U5 are electrically connected with the transceiving ports of the level conversion chip U4 in a one-to-one correspondence mode.
The utility model discloses in, load switch U3 can select for use the TPS22917 chip of U.S. Texas instrument company, and level conversion chip U4 is MAX3485 chip, and NB-IOT communication unit U5 can select for use the E840-DTU terminal or Hua be the seaside NB-IOT terminal of company of one hundred million special electronics branch of academic or vocational technologies ltd.
As shown in fig. 1, the utility model discloses a rechargeable power supply 6, rechargeable power supply 6 respectively with MCU1, triaxial acceleration sensor 2, valve close sub-circuit 3, motorised valve 4 and communication sub-circuit 5 electric connection. Because the utility model discloses a be that the MCU1 of dormancy function has extremely low stand-by power consumption, can long-term steady operation. The rechargeable power supply 6 can obtain electric energy from a power grid at ordinary times and charge, and when fire disaster occurs to an earthquake and the power grid fails, the rechargeable power supply 6 can continuously supply power to the device to maintain normal operation of the device. The rechargeable power supply 6 may employ a UPS power supply.
The utility model discloses a use method, including following step:
s1: initially configuring the MCU1, the three-axis acceleration sensor 2, the valve closing sub-circuit 3, the electric valve 4 with a shut-off pipe component, and the communication sub-circuit 5 such that the electric valve 4 is normally in a normally open position; the MCU1 and the triaxial acceleration sensor 2 are in a dormant energy-saving state when not in operation; the triaxial acceleration sensor 2 sets a first acceleration threshold and a second acceleration threshold;
s2: when the gas pipeline vibrates and exceeds a first acceleration threshold, the three-axis acceleration sensor 2 is activated and acceleration measurement is carried out, and when the vibration acceleration detected by the three-axis acceleration sensor 2 is smaller than a second acceleration threshold, the three-axis acceleration sensor 2 does not output and sleeps again after a period of time delay; when the vibration acceleration detected by the triaxial acceleration sensor 2 is above a second acceleration threshold value, the interrupt output end of the triaxial acceleration sensor 2 sends an interrupt signal to the interrupt input end of the MCU1, the MCU1 is awakened, and the vibration acceleration measurement result is sent to the MCU1 through the SPI port; the first acceleration threshold may be set relatively small, such as 0.005g, g being the acceleration of gravity; the second acceleration threshold may be set to a vibration acceleration corresponding to seismic intensity with more severe consequences, such as 0.4 g;
s3: the MCU1 calculates the average value of the vibration acceleration according to the received vibration acceleration measurement result, and judges the earthquake intensity, wherein the average value of the peak acceleration reaches 0.125g and represents the intensity VII level earthquake, and the average value of the peak acceleration reaches 0.25g and represents the intensity VIII level earthquake; the average value of the peak acceleration reaches 0.5g, which represents IX grade earthquake; the method can also be confirmed according to the local longitude and latitude and a Chinese earthquake motion peak acceleration zone chart in GB18306-2018 appendix A;
s4: the MCU1 respectively sends out enabling signals to the valve closing sub-circuit 3 and the communication sub-circuit 5 according to the earthquake intensity level, and activates the valve closing sub-circuit 3 and the communication sub-circuit 5 and keeps the working state of the two sub-circuits;
s5: the valve closing sub-circuit (3) drives the electric valve (4) to close the gas pipeline, and after the electric valve (4) is completely closed, the distance sensor S1 sends a feedback signal of the current position of the pipeline closing part back to the MCU (1); completing the execution process of the shutdown of the local gas pipeline earthquake emergency treatment device, and cutting off the gas supply of the gas pipeline;
s6: the MCU (1) also communicates the vibration acceleration measurement result, the vibration acceleration average value and the earthquake intensity information to a communication sub circuit (5) of an adjacent gas pipeline earthquake emergency treatment device or a remote main station through the communication sub circuit (5), further confirms the earthquake intensity with the adjacent gas pipeline earthquake emergency treatment device or the remote main station to form a majority combination judgment algorithm of a plurality of gas pipeline earthquake emergency treatment devices, and keeps the opening or closing state of each gas pipeline according to the judgment result; if the gas pipeline earthquake emergency disposal devices in the area are N, the remote master station receives earthquake intensity information sent by the M gas pipeline earthquake emergency disposal devices, and when M is larger than or equal to N/2, all the gas pipeline earthquake emergency disposal devices in the area act to cut off the gas pipelines of which the devices are located;
s7: when the three-axis acceleration sensor (2) does not send an interrupt signal to the MCU (1), the MCU (1) is automatically awakened periodically, and the communication sub-circuit (5) is started to actively send a heartbeat data packet in a normal working state to the remote master station.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A gas pipeline earthquake emergency treatment device is characterized in that: the device comprises an MCU (1), a triaxial acceleration sensor (2), a valve closing sub-circuit (3), an electric valve (4) with a pipeline closing part and a communication sub-circuit (5);
the output end of the triaxial acceleration sensor (2) is respectively and electrically connected with the GPIO port and the interrupt port of the MCU (1); the MCU (1) is electrically connected with the input end of the valve closing sub-circuit (3); the MCU (1) is also electrically connected with the communication sub-circuit (5); the output end of the valve closing sub-circuit (3) is electrically connected with the input end of the electric valve (4), and the feedback signal end of the electric valve (4) is electrically connected with the input end of the MCU (1);
the three-axis acceleration sensor (2) detects the vibration acceleration of the pipeline and sends the acceleration detection result to the MCU (1); the MCU (1) enters a working state and opens the valve closing sub-circuit (3) and the communication sub-circuit (5) according to an acceleration detection result, the valve closing sub-circuit (3) starts the electric valve (4) and executes the action of closing the valve, and the electric valve (4) feeds back the current position information of the closed pipeline part after the action to the MCU (1); the MCU (1) is communicated with a communication sub-circuit (5) of an adjacent gas pipeline earthquake emergency treatment device or a remote main station through the communication sub-circuit (5).
2. A gas pipeline seismic emergency treatment device as claimed in claim 1, wherein: the SPI ports of the three-axis acceleration sensor (2) are electrically connected with the SPI ports of the MCU (1) in a one-to-one correspondence manner, and the interrupt output end of the three-axis acceleration sensor (2) is electrically connected with the interrupt input end of the MCU (1); and an interrupt signal sent by an interrupt output end of the triaxial acceleration sensor (2) is used as a wake-up signal for the MCU (1) to enter a working state from a dormant standby state.
3. A gas pipeline seismic emergency treatment device as claimed in claim 2, wherein: the valve closing sub-circuit (3) comprises a boosting chip U1 and a single-channel switch chip U2, the input end of the boosting chip U1 is electrically connected with a +3.3V power supply, and the enabling end of the boosting chip U1 is electrically connected with a GPIO port of the MCU (1); the output end of the voltage boosting chip U1 is electrically connected with the input end and the enabling end of the single-channel switch chip U2, and the output end of the single-channel switch chip U2 is electrically connected with the electric valve (4).
4. A gas pipeline seismic emergency treatment device as claimed in claim 3, wherein: and the opening position and the closing position of the pipe closing part of the electric valve (4) are both provided with a distance sensor S1, and the output end of the distance sensor S1 is electrically connected with the GPIO port of the MCU (1).
5. A gas pipeline seismic emergency treatment device as claimed in claim 4, wherein: the communication sub-circuit (5) comprises a load switch U3, a level conversion chip U4 and an NB-IOT communication unit U5, wherein the input end of the load switch U3 is electrically connected with a GPIO port of the MCU (1); the power supply input end of the load switch U3 is electrically connected with a +3.3V power supply, and the output end of the load switch U3 is electrically connected with the power supply end of the NB-IOT communication unit U5; the UART port of the MCU (1) and the URART port of the NB-IOT communication unit U5 are respectively electrically connected with the transceiving ports of the level conversion chip U4 in a one-to-one correspondence mode.
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| CN202020933987.3U CN212207692U (en) | 2020-05-28 | 2020-05-28 | Gas pipeline earthquake emergency treatment device |
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| CN202020933987.3U CN212207692U (en) | 2020-05-28 | 2020-05-28 | Gas pipeline earthquake emergency treatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210302602A1 (en) * | 2020-03-31 | 2021-09-30 | Omron Corporation | Seismic sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210302602A1 (en) * | 2020-03-31 | 2021-09-30 | Omron Corporation | Seismic sensor |
| US11635534B2 (en) * | 2020-03-31 | 2023-04-25 | Omron Corporation | Seismic sensor |
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