CN114325881A - Intelligent tipping bucket type rainfall monitoring system and measuring instrument - Google Patents
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Abstract
The invention relates to the technical field of rainfall monitoring equipment, in particular to an intelligent tipping bucket type rainfall monitoring system; comprises a tipping bucket type rainfall sensor, a measuring circuit, a processor and a rainfall sensor. The tipping bucket type rainfall sensor forms a switching signal through rainfall; the measuring circuit converts the switching signal into precipitation observation element data; the rainfall sensor is used for qualitatively sensing and measuring the rainfall and forming rainfall state data of the presence or absence or the intensity of the rainfall; the processor stores threshold data, and carries out comprehensive comparison processing on rainfall observation element data acquired by the tipping bucket type rainfall sensing according to the rainfall state data and the threshold data, and judges whether the acquired rainfall observation element data is credible, suspicious or false. The invention aims to solve the problem that the quality of acquired rainfall data cannot be guaranteed because the acquired rainfall data cannot be proved and the quality control of the acquired rainfall data is difficult to realize by the conventional tipping bucket type rainfall sensor.
Description
Technical Field
The invention relates to the technical field of rainfall monitoring equipment, in particular to an intelligent tipping bucket type rainfall monitoring system and an intelligent tipping bucket type rainfall monitoring instrument.
Background
The tipping bucket type rainfall sensor has become the mainstream rainfall sensor for ground rainfall observation of meteorological departments in China at present, and plays an important role in meteorological service work.
With the application of intelligent processor technology to sensors, the sensors of the existing dump-bucket rainfall measuring instrument have been developed from a traditional analog type to a digital and intelligent type. The existing automatic meteorological station in China mainly adopts a CAN structural design of 'a main collector + an external bus + a sub collector + a sensor + peripheral equipment', the sensor adopts analog and digital sensors, and the structure is favorable for forming a unified automatic station but is not favorable for interchange, calibration and management among the sensors.
At present, the traditional tipping bucket rainfall sensor is only used for counting and has single function. The existing tipping bucket type rainfall sensor can only be combined with a data acquisition unit to realize the purpose of automatic rainfall observation. For example, the chinese publication No. CN213934261U discloses an automatic weather station operating state acquisition device, which comprises a controller, a rainfall signal acquisition module, a voltage signal acquisition module, a tipping bucket type rain gauge, a box door state module and a power supply module, and directly acquires an electrical parameter signal of an automatic weather station operating state through hardware connections such as a signal acquisition circuit, an optical coupler and a filter shaping circuit, and a field test is not required during operation and maintenance of equipment, and a faulty component can be directly replaced according to the electrical parameter signal of the acquired operating state, thereby improving the comprehensive analysis capability of the equipment and ensuring the timeliness.
However, the above dump bucket type rainfall sensor can only detect a faulty acquisition device, cannot perform intelligent correction, and cannot automatically recover to an initial state. Meanwhile, when the tipping bucket type rainfall sensor fails in operation, the rainfall data obtained by the tipping bucket type rainfall sensor cannot be subjected to evidence, so that the quality of the rainfall data obtained by the tipping bucket type rainfall sensor cannot be controlled, and the quality of the rainfall data cannot be guaranteed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an intelligent tipping bucket type rainfall monitoring system to solve the problems that the quality of acquired rainfall data cannot be guaranteed as the existing tipping bucket type rainfall sensor cannot assist in the certification of the acquired rainfall data, cannot control the quality of the rainfall data and cannot find the fault of the tipping bucket type rainfall sensor in time.
In order to achieve the purpose, the invention adopts the following technical scheme: an intelligent tipping bucket type rainfall monitoring system comprises a tipping bucket type rainfall sensor, a measuring circuit, a processor and a rainfall sensor;
the tipping bucket type rainfall sensor forms a switching signal through rainfall;
the input end of the measuring circuit is electrically connected with the tipping bucket type rainfall sensor, and the measuring circuit is used for acquiring the switching signal and converting the switching signal into precipitation observation element data;
the output end of the rainfall sensor is electrically connected with the input end of the processor, the rainfall sensor is arranged on one side of the outer cylinder wall of the tipping bucket type rainfall sensor, and the rainfall sensor is used for qualitatively sensing and measuring the rainfall and forming rainfall state data of the presence or absence or the intensity of the rainfall;
the input end of the processor is electrically connected with the output end of the measuring circuit, threshold data of historical rainfall extreme values of rainfall monitoring stations are stored in the processor, the processor comprehensively compares the acquired rainfall observation element data according to the rain sensation state data and the threshold data and judges whether the acquired rainfall observation element data is credible, suspicious or false, and the output end of the processor outputs the quality-controlled rainfall observation element data.
Preferably, the tipping bucket type rainfall sensor comprises a counting tipping bucket, magnetic steel and a reed switch; the counting tipping bucket is used for counting rainfall, the magnetic steel is connected with the counting tipping bucket, the reed pipe is electrically connected with the input end of the measuring circuit, the magnetic steel and the reed pipe are in magnetic attraction fit under the state that the counting tipping bucket is turned over, and the reed pipe is magnetized and closed to generate the switching signal.
Preferably, the measurement circuit comprises an acquisition module, and the acquisition module is used for converting the switching signal into precipitation observation element data.
Preferably, the processor comprises an MCU, a data memory, a program memory, a driving circuit and a clock, and the MCU judges whether the rainfall observation element data is credible, suspicious or false according to the rainfall state data, the threshold data and the rainfall observation element data obtained by quality control; the data memory, the program memory, the driving circuit and the clock are in communication connection with the MCU, the data memory is used for storing the rain sensing state data and the threshold data, the program memory is used for storing program information for controlling the precipitation observation element data in a quality control mode, the driving circuit is used for amplifying signals acquired by the MCU, and the clock is used for providing clock pulses for the MCU.
Preferably, the system further comprises a power supply circuit, the processor and the measuring circuit are both electrically connected with the power supply circuit, and the power supply circuit is used for supplying power to the processor and the measuring circuit.
Preferably, the power supply circuit is provided with a power interface.
Preferably, the processor is provided with a data interface for data interaction.
Preferably, the system also comprises a monitoring circuit, wherein the measuring circuit is electrically connected with the tipping bucket type rainfall sensor, the measuring circuit, the rainfall sensor, the processor and the power supply circuit;
the measuring circuit is used for monitoring the working states of the tipping bucket type rainfall sensor, the measuring circuit, the processor, the rainfall sensor and the power supply circuit, forming monitoring information and feeding the monitoring information back to the MCU;
the data memory also stores backup data used in normal working state, the program memory also stores program information used for diagnosing and restoring the backup data, and the MCU is used for processing the monitoring information.
The invention also provides an intelligent tipping bucket rainfall measuring instrument which comprises the intelligent tipping bucket rainfall monitoring system.
Compared with the prior art, the beneficial effect that this scheme produced is:
1. switch signals are obtained through the tipping bucket type rainfall sensor, the switch signals are converted into precipitation observation element data by the measuring circuit, and the precipitation observation element data are processed by the processor, so that the rainfall is processed, diagnosed and controlled in quality. The rainfall sensor is used for qualitatively sensing and measuring the rainfall and forming rainfall state data with or without rainfall or strong and weak rainfall, the processor compares and judges the acquired rainfall state data and historical rainfall extreme value data stored in the memory with rainfall observation element data in sequence respectively, so that verification of the existing corroborative rainfall state data is realized, verification of threshold value data of historical rainfall extreme values is also realized, quality control of intelligent rainfall observation element data is realized, and faults of the tipping bucket type rainfall sensor can be found in time.
2. Through the setting of MCU, data memory, program memory, drive circuit and clock, data memory stores threshold value data, rain sensing state data and the backup data that is used for normal operating condition. The program memory stores program information for quality control of the water-lowering observation factor data and program information for diagnosis and restoration of backup data. Therefore, the MCU calls the threshold data, the rain sensing state data and the program information of the rainfall observation element data to control the quality of the rainfall observation element data. Meanwhile, program information for diagnosis is called through the MCU, and when abnormal faults occur in the working states of the tipping bucket type rainfall sensor, the measuring circuit, the processor and the power supply circuit, whether the work is normal or not can be automatically diagnosed, and fault positioning can be carried out; and calling program information for restoring the backup data through the MCU to restore corresponding faults, thereby intelligently and automatically diagnosing and maintaining the tipping bucket type rainfall sensor, the measuring circuit, the processor and the power supply circuit.
3. The working states of the tipping bucket type rainfall sensor, the measuring circuit and the processor are monitored in real time through the monitoring circuit to form monitoring information, the monitoring information is fed back to the MCU, the MCU analyzes and contrasts the monitoring information and backup data of a normal working state, and therefore real-time monitoring is conducted on the operating states of the tipping bucket type rainfall sensor, the measuring circuit and the processor during working.
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In order to more clearly illustrate the embodiments of the present invention, the drawings, which are required to be used in the embodiments, will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.
FIG. 1 is a block diagram of an intelligent tipping bucket rainfall monitoring system according to the present invention;
FIG. 2 is a schematic circuit diagram of an acquisition module in the intelligent skip bucket rainfall monitoring system according to the present invention;
FIG. 3 is a schematic circuit diagram of a monitoring circuit in the intelligent tipping bucket rainfall monitoring system according to the present invention;
fig. 4 is a schematic circuit diagram of a power supply circuit in the intelligent skip bucket type rainfall monitoring system according to the present invention.
Reference numerals:
the rainfall sensor comprises a tipping bucket type rainfall sensor 1, a measuring circuit 2, a processor 3, an MCU31, a data memory 32, a program memory 33, a drive circuit 34, a clock 35, an RS232 interface 36, a rainfall sensor 4, a monitoring circuit 5, a power supply circuit 6 and a power supply interface 61.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
Referring to fig. 1-4, an intelligent skip bucket rainfall monitoring system includes a skip bucket rainfall sensor 1, a measuring circuit 2, a rainfall sensor 4 and a processor 3.
Wherein, tipping bucket formula rainfall sensor 1 forms switching signal through the rainfall. In this embodiment, the skip bucket type rainfall sensor 1 includes a counting skip bucket, magnetic steel and a reed switch. Specifically, the counting tipping bucket is used for receiving rainfall, the magnetic steel is connected with the counting tipping bucket, the reed pipe is electrically connected with the measuring circuit 2, and the magnetic steel is in magnetic attraction fit with the reed pipe and the reed pipe is magnetized and closed to generate a switching signal under the overturning state of the counting tipping bucket. Meanwhile, the top of the counting tipping bucket can be provided with a water bearing device, a tipping bucket, a collecting hopper and a metering tipping bucket from top to bottom. The specific working principle is as follows: rainfall collected by the water bearing device enters the upper tipping bucket through the funnel, the upper tipping bucket overturns under the action of self gravity, water enters the collecting funnel and is injected into the metering tipping bucket, the metering tipping bucket dumps the rainfall to the counting tipping bucket, the counting tipping bucket overturns once, the magnetic steel scans the reed pipe once, and the reed pipe is closed once instantaneously due to magnetization, so that a switching signal is generated.
The input end of the measuring circuit 2 is electrically connected with the tipping bucket type rainfall sensor 1 through a wire, and the measuring circuit 2 is used for acquiring a switching signal and converting the switching signal into rainfall observation element data. Specifically, the measurement circuit 2 is provided with an acquisition module, and the acquisition module is used for converting the switching signal into precipitation observation element data. IN this embodiment, please refer to fig. 2, that is, after the input end of the collecting module collects the switching signal, it samples the switching signal between IN + and IN-at the CNV rising edge through AD7685, so as to convert the switching signal into the precipitation observation element data through a/D conversion.
The output end of the rainfall sensor 4 is electrically connected with the input end of the processor 3 in a wire mode, the rainfall sensor 4 is installed on one side of the tipping bucket type rainfall sensor 1, and the rainfall sensor 4 is used for qualitatively sensing and measuring the rainfall and forming rainfall state data of the existence or the strength of the rainfall. The intensity of the rain sensing state data includes weak intensity, and strong intensity of neutralization. In this embodiment, the rainfall sensor 4 may be a piezoelectric rainfall sensor, such as a piezoelectric rainfall sensor of model CG-62. The piezoelectric vibrator vibrates according to the intensity of raindrops and the rainfall when being subjected to rain, and rain sensing state data of the presence or absence or intensity of the rainfall is formed through vibration.
The concrete working mode of piezoelectric rainfall sensor does: the rainfall and the rainfall intensity are measured and calculated by adopting an impact measurement principle, namely the raindrops are subjected to the action of raindrop weight and air resistance in the falling process, the speed is constant when the raindrops reach the ground, and the raindrop weight can be obtained by measuring impact force according to P = mv, so that the rainfall and the rainfall intensity are measured. The rainfall sensor detects the sensed rainfall state data and feeds back the sensed rainfall state data to the input end of the MCU through the output end.
The input end of the processor 3 is electrically connected with the output end of the measuring circuit 2 in a wire mode, and the processor 3 stores threshold data of historical rainfall extreme values of the rainfall monitoring station. That is, the threshold data specifically includes the historical rainfall limit values in the time and space domains of the station and the surrounding stations. The processor 3 processes the acquired rainfall observation element data according to the threshold data and the rainfall sensation state data, judges whether the acquired rainfall observation element data is credible, suspicious or false, and outputs the quality-controlled rainfall observation element data at the output end of the processor 3. Meanwhile, the processor 3 is provided with a data RS232 interface 36 for data interaction. The data RS232 interface 36 is an RS232 interface 36, and the 3-wire RS232 serial data RS232 interface 36 can be connected with other wired or wireless communication modules in an extensible mode to complete data interaction.
In particular, the processor 3 comprises an MCU31, a data memory 32, a program memory 33, a driver circuit 34 and a clock 35. The MCU31 is used for processing the acquired rainfall observation element data according to the threshold data and the rain sensation state data and judging whether the rainfall observation element data is credible, suspicious or false. The data memory 32, the program memory 33, the driving circuit 34 and the clock 35 are all in communication connection with the MCU31, the data memory 32 is used for storing threshold data, rain sensing state data and backup data for a normal operating state, the program memory 33 is used for storing program information of quality control precipitation observation element data, the driving circuit 34 is used for amplifying signals acquired by the MCU31, and the clock 35 is used for providing clock 35 pulses to the MCU 31. In this embodiment, the processor 3 may be an AT89S52 chip. The specific determination manner of the processor 3 is as follows: if the rainfall observation element data is credible, the output end of the processor 3 outputs a rainfall value with a credible mark, if the rainfall observation element data is suspicious, the output end of the processor 3 outputs a rainfall value with a suspicious mark, and if the rainfall observation element data is a false value, the output end of the processor 3 outputs an error rainfall value with an alarm function.
The data storage 32 stores threshold data, rain-feeling state data, and backup data for a normal operating state. The program memory 33 stores program information for quality control precipitation observation factor data and program information for diagnosing and restoring backup data. During operation, tipping bucket formula rainfall sensor 1 obtains the switch signal through the rainfall, the collection module in measuring circuit 2 converts the switch signal into precipitation observation element data, simultaneously, rainfall inductor 4 detects the existence and the size of the rain condition, MCU31 compares the judgement respectively through precipitation observation element data that obtain with rain sensation state data and threshold value data, MCU31 handles precipitation observation element data after the judgement, thereby realize the verification of existing evidences rain sensation state data, the control that has this threshold value of historical space time extreme value again, not only realize intelligence and carry out quality control to precipitation observation element data, and can realize timely discovery tipping bucket formula rainfall sensor 1's trouble.
Meanwhile, program information for diagnosis is called through the MCU31, and when abnormal faults occur in the working states of the tipping bucket type rainfall sensor 1, the measuring circuit 2, the processor 3 and the power supply circuit 6, whether the work is normal or not can be automatically diagnosed, and fault positioning can be carried out. The program information for restoring the backup data is called by the MCU31 to restore the corresponding fault, so that the intelligent maintenance guarantee for the tipping bucket type rainfall sensor 1, the measuring circuit 2, the processor 3 and the power supply circuit 6 is realized.
Example two
On the basis of the first embodiment, the present embodiment further includes a monitoring circuit 5, and an input end of the monitoring circuit 5 is electrically connected to an output end of the dump bucket rainfall sensor 1, an output end of the measuring circuit 2, and an output end of the processor 3 through wires. The monitoring circuit 5 is used for monitoring the working states of the tipping bucket rainfall sensor 1, the measuring circuit 2 and the processor 3, forming monitoring information and feeding the monitoring information back to the MCU 31. The MCU is electrically connected with the measuring circuit 2 and is used for processing rainfall observation element data information and state information.
In this embodiment, referring to fig. 3, the monitoring circuit 5 may be a current signal monitoring circuit 5 formed by an a7840 chip. The input end of the monitoring circuit 5 is respectively and directly connected with the output end of the tipping bucket type rainfall sensor 1, the output end of the measuring circuit 2 and the output end of the processor 3 in series, an output current signal is converted into a voltage signal by the sampling resistor, the voltage signal is introduced into the signal input end of A7840 through R1, and photoelectric isolation and linear transmission are carried out by U3. Therefore, the input signal is detected, and the monitoring information is formed.
The working states of the tipping bucket type rainfall sensor 1, the measuring circuit 2 and the processor 3 are monitored in real time through the monitoring circuit 5 to form monitoring information, the monitoring information is fed back to the MCU31, the MCU31 analyzes and contrasts the monitoring information and backup data of a normal working state, and therefore the tipping bucket type rainfall sensor has the advantages of being reliable in performance, high in accuracy, easy to maintain and backup, and capable of guaranteeing signal acquisition, data processing and quality control of rainfall. Therefore, the method has the characteristics of reliable performance, high accuracy, easiness in maintenance and easiness in backup. The rainfall signal acquisition, data processing, quality control and the self-detection of the tipping bucket rainfall sensor 1 are realized, so that the rainfall data acquisition accuracy is guaranteed.
EXAMPLE III
On the basis of the first embodiment, the present embodiment further includes a power supply circuit 6. The processor 3, the monitoring circuit 5 and the measuring circuit 2 are all electrically connected with the power supply circuit 6, the power supply circuit 6 is used for supplying power to the processor 3, the monitoring circuit 5 and the measuring circuit 2, and the monitoring circuit 5 can monitor the working state of the power supply circuit 6 to form state information. Meanwhile, the power supply circuit 6 is provided with a power supply interface 61. Meanwhile, the measuring circuit 2 can also detect the working state of the power supply circuit 6, form monitoring information and feed back the monitoring information to the MCU 31. In this embodiment, referring to fig. 4, the detection circuit, the processor 3 and the measurement circuit 2 may be powered by the power supply circuit 6 by using an external storage battery or an external power supply through the power interface 61. Therefore, the processor 3, the monitoring circuit 5 and the measuring circuit 2 can be supplied with power in a voltage-stabilizing manner in real time.
The invention also provides an intelligent tipping bucket rainfall measuring instrument which comprises the intelligent tipping bucket rainfall monitoring system. Preferably, the sensor in the intelligent tipping bucket rainfall measuring instrument is the above intelligent tipping bucket rainfall monitoring system. Therefore, the intelligent tipping bucket rainfall measuring instrument realizes the functions of signal acquisition, data processing, quality control, self-detection, self-diagnosis, self-recovery and the like.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (9)
1. An intelligent tipping bucket type rainfall monitoring system is characterized by comprising a tipping bucket type rainfall sensor (1), a measuring circuit (2), a processor (3) and a rainfall sensor (4);
the tipping bucket type rainfall sensor (1) forms a switching signal through rainfall;
the input end of the measuring circuit (2) is electrically connected with the tipping bucket type rainfall sensor (1), and the measuring circuit (2) is used for acquiring the switching signal and converting the switching signal into rainfall observation element data;
the output end of the rainfall sensor (4) is electrically connected with the input end of the processor (3), the rainfall sensor (4) is arranged on one side of the outer cylinder wall of the tipping bucket type rainfall sensor (1), and the rainfall sensor (4) is used for qualitatively sensing and measuring the rainfall and forming rainfall state data of the existence or the strength of the rainfall;
the input end of the processor (3) is electrically connected with the output end of the measuring circuit (2), threshold data of historical rainfall extreme values of rainfall monitoring sites are stored in the processor (3), the processor (3) comprehensively compares the acquired rainfall observation element data according to the rain sensation state data and the threshold data and judges whether the acquired rainfall observation element data is credible, suspicious or false, and the output end of the processor (3) outputs the rainfall observation element data after quality control.
2. The intelligent skip bucket rainfall monitoring system according to claim 1 wherein the skip bucket rainfall sensor (1) comprises a counting skip bucket, magnetic steel and a reed switch;
the counting tipping bucket is used for counting rainfall, the magnetic steel is connected with the counting tipping bucket, the reed pipe is electrically connected with the input end of the measuring circuit (2), the magnetic steel and the reed pipe are in magnetic attraction fit under the overturning state of the counting tipping bucket, and the reed pipe is magnetized and closed to generate the switch signal.
3. The intelligent skip rainfall monitoring system of claim 2 wherein the measurement circuit (2) comprises an acquisition module for converting the switching signal into precipitation observation factor data.
4. The intelligent dump bucket rainfall monitoring system of claim 1 or 3 wherein the processor (3) comprises an MCU (31), a data memory (32), a program memory (33), a driving circuit (34) and a clock (35), wherein the MCU (31) is used for quality control of the acquired rainfall observation element data according to the rain sensing state data and the threshold value data and judging whether the rainfall observation element data is credible, suspicious or false;
the data memory (32), the program memory (33), the driving circuit (34) and the clock (35) are in communication connection with the MCU (31), the data memory (32) is used for storing the rain sensation state data and the threshold data, the program memory (33) is used for storing program information for controlling the rainfall observation element data in a quality mode, the driving circuit (34) is used for amplifying signals acquired by the MCU (31), and the clock (35) is used for providing clock (35) pulses for the MCU (31).
5. The intelligent skip rainfall monitoring system according to claim 4 further comprising a power supply circuit (6), wherein the processor (3) and the measuring circuit (2) are both electrically connected to the power supply circuit (6), and the power supply circuit (6) is used for supplying power to the processor (3) and the measuring circuit (2).
6. Intelligent skip rainfall monitoring system according to claim 5 wherein the power supply circuit (6) is provided with a power interface (61).
7. Intelligent skip rainfall monitoring system according to claim 6 wherein the processor (3) is provided with a data RS232 interface (36) for data interaction.
8. The intelligent skip bucket rainfall monitoring system according to claim 4 further comprising a monitoring circuit (5), wherein the measuring circuit (2) is electrically connected with the skip bucket rainfall sensor (1), the measuring circuit (2), the processor (3), the rainfall sensor (4) and the power supply circuit (6);
the measuring circuit (2) is used for monitoring the working states of the tipping bucket type rainfall sensor (1), the measuring circuit (2), the rainfall sensor (4), the processor (3) and the power supply circuit (6), forming monitoring information and feeding the monitoring information back to the MCU (31);
the data memory (32) is also used for storing backup data used in a normal working state, the program memory (33) is also used for storing program information used for diagnosing and recovering the backup data, and the MCU (31) is used for processing the monitoring information.
9. An intelligent skip rainfall gauge comprising the intelligent skip rainfall monitoring system of any one of claims 1-8.
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| EP3781965A1 (en) * | 2018-04-17 | 2021-02-24 | SUEZ Groupe | Device, method and computer program product for validating data provided by a rain sensor |
| CN109840260A (en) * | 2019-02-02 | 2019-06-04 | 中国水利水电科学研究院 | A kind of extensive real-time rainfall automatic Observation station ranked data processing method based on dynamic interpolation |
| CN111103636A (en) * | 2019-12-06 | 2020-05-05 | 江西武大扬帆科技有限公司 | Automatic rain condition measuring and reporting system |
| CN112649901A (en) * | 2020-11-30 | 2021-04-13 | 中水三立数据技术股份有限公司 | Telemetering terminal with rainfall false alarm preventing function and implementation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI793041B (en) * | 2022-07-05 | 2023-02-11 | 國立臺灣大學 | Calibration systems |
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| CN114325881B (en) | 2024-05-31 |
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