CN113029291A - Ultrasonic oil level monitoring device for transformer based on narrow-band Internet of things technology - Google Patents
Ultrasonic oil level monitoring device for transformer based on narrow-band Internet of things technology Download PDFInfo
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- CN113029291A CN113029291A CN202110285472.6A CN202110285472A CN113029291A CN 113029291 A CN113029291 A CN 113029291A CN 202110285472 A CN202110285472 A CN 202110285472A CN 113029291 A CN113029291 A CN 113029291A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 29
- 238000005516 engineering process Methods 0.000 title claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 9
- 239000007788 liquid Substances 0.000 description 4
- 238000007667 floating Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000002775 capsule Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010913 used oil Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2968—Transducers specially adapted for acoustic level indicators
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- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses an ultrasonic oil level monitoring device for a transformer based on a narrow-band Internet of things technology, which comprises an ultrasonic oil level sensor module, a microprocessor, a wireless communication module, a power supply module, a switch module and the like, wherein the ultrasonic oil level sensor module is positioned above the oil surface of a transformer conservator and transmits ultrasonic waves to the oil surface, and the ultrasonic waves return to the ultrasonic oil level sensor module after being transmitted to the oil surface; the microprocessor controls the ultrasonic oil level sensor module to work and processes the ultrasonic oil level sensor module according to the time interval from sending to receiving of ultrasonic waves to obtain oil level data or oil amount information; the microprocessor transmits the oil level data or the oil amount information to the terminal server through a narrow-band Internet of things module of the wireless communication module; the power supply module supplies power to each equipment module; the switch module controls power-on or power-off of each device. The advantages are that: the device combines all parts together, has realized the non-contact measurement to transformer conservator oil level, is applicable to the site work environment and the inner structure characteristic of transformer.
Description
Technical Field
The invention relates to the technical field of transformer detection devices, comprises ultrasonic sensors, monitoring means, wireless communication and other related technologies, and particularly relates to an intelligent ultrasonic oil level monitoring device for a transformer based on a narrow-band Internet of things technology.
Background
The oil level gauge is an important monitoring device for oil quantity parameters in oil-filled electrical equipment such as a transformer, and commonly used oil level gauges include a tubular oil level gauge and a pointer oil level gauge. The phenomenon that the oil level gauges are inaccurate in display and even invalid after the two oil level gauges are operated for a long time is commonly called as 'false oil level', and the phenomenon brings great harm to the operation of oil-immersed electrical equipment such as transformers and the like.
At present, more and more transformer substations have been realized unattended, if the oil level that is very important to transformer operation shows inaccurately or lacks on-line monitoring, will lead to core substation equipment state perception reliability lower, along with the construction of strong smart power grids and ubiquitous electric power thing networking, the oil level real-time on-line monitoring of transformer receives much attention.
In the prior art, the oil level of an oil conservator of a transformer is generally detected by two modes, namely horizontal glass tube indication or a metal floating ball type oil level meter. The former utilizes the pressure balance principle of a U-shaped liquid level meter, and the latter principle is that a floating ball connecting rod triggers magnetic force change and finally triggers gauge needle change. Because both the oil conservators and the oil conservators belong to pure mechanical structures, the oil conservators and the oil conservators can be directly contacted with transformer oil for detection, so that the oil conservators are required to be disassembled for maintenance when faults such as rupture of capsules in the oil conservators, pressure abnormity or rupture of floating balls, bending of connecting rods, blocking of gauge needles and the like occur, and the oil conservators are required to be subjected to a series of operations such as long period, weather restriction, high cost and the like after maintenance is finished. Therefore, an improved scheme is provided for the existing oil conservator oil level detection device, and the technical problem which needs to be solved urgently in the industry at present is solved.
Disclosure of Invention
The invention aims to provide an intelligent ultrasonic oil level monitoring device for a transformer based on a narrow-band Internet of things technology, which combines an ultrasonic oil level sensor module, a microprocessor, a wireless communication module, a power supply module, a switch module and other components to realize non-contact measurement of the oil level of a transformer conservator.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the utility model provides an ultrasonic wave oil level monitoring devices for transformer based on narrowband internet of things, contains:
the ultrasonic oil level sensor module is positioned above the oil surface of the transformer oil conservator, transmits ultrasonic waves to the oil surface, and returns to the ultrasonic oil level sensor module after the ultrasonic waves are transmitted to the oil surface;
the microprocessor is connected with the ultrasonic oil level sensor module, controls the ultrasonic oil level sensor module to work, and processes the ultrasonic oil level sensor module according to the time interval from sending to receiving of ultrasonic waves to obtain oil level data or oil amount information;
the wireless communication module is connected with the microprocessor and comprises a narrow-band Internet of things module, and the microprocessor transmits oil level data or oil amount information to the terminal server through the narrow-band Internet of things module;
the power supply module supplies power to each equipment module;
and the switch module is connected with the power supply module and is used for controlling the power-on or power-off of each device.
Optionally, the wireless communication module further includes:
the GPS module is used for measuring the positioning information of the transformer and transmitting the positioning information to the microprocessor;
and the plurality of ANT antennas are respectively connected with the GPS module and the narrow-band Internet of things module so as to realize the information transmission of the GPS module and the narrow-band Internet of things module.
Optionally, the wireless communication module further includes:
and the SIM card circuit is connected with the SIM card and is used for sending information to the SIM card.
Optionally, the method further includes:
and two ends of the first power supply driving module are respectively connected with the switch module and the microprocessor, and the first power supply driving module supplies power to the microprocessor to drive the microprocessor to work.
Optionally, the first power supply driving module is a 3.3V power supply circuit module.
Optionally, the method further includes:
and the two ends of the second power supply driving module are respectively connected with the switch module and the ultrasonic oil level sensor module, and the second power supply driving module supplies power to the ultrasonic oil level sensor module to drive the ultrasonic oil level sensor module to work.
Optionally, the second power supply driving module is a 12V power supply circuit module.
Optionally, the method further includes:
and the fault alarm device is connected with the microprocessor, and when the oil conservator or the ultrasonic oil level sensor module breaks down and the oil level or the oil temperature is abnormal, the fault alarm device carries out field alarm or remote alarm.
Optionally, the fault alarm device comprises an audible and visual alarm.
Optionally, the wireless communication module is connected with the microprocessor in a TTL serial port manner;
and/or the ultrasonic oil level sensor module comprises an ultrasonic sensor;
and/or the power module is a lithium subcell.
Compared with the prior art, the invention has the following advantages:
according to the intelligent ultrasonic oil level monitoring device for the transformer based on the narrow-band Internet of things technology, the ultrasonic oil level sensor module, the microprocessor, the wireless communication module, the power supply module, the switch module and the like are combined, non-contact measurement of the oil level of the transformer conservator is achieved, the device is suitable for the field working environment and the internal structural characteristics of the transformer, fixed-point detection can be achieved, and continuous detection of different points can be conducted.
Furthermore, in the intelligent ultrasonic oil level monitoring device for the transformer based on the narrow-band internet of things technology, the installation position of the ultrasonic oil level sensor module is adjustable, the ultrasonic oil level sensor module can be positioned and fixedly installed, the switch module, the first power supply driving module and the second power supply driving module are adopted for remote control, and the position of the ultrasonic oil level sensor module can be changed for mobile temporary detection.
Drawings
Fig. 1 is a schematic diagram of an ultrasonic oil level monitoring device for a transformer based on a narrow-band internet of things technology.
Detailed Description
The present invention will now be further described by way of the following detailed description of a preferred embodiment thereof, taken in conjunction with the accompanying drawings.
As shown in fig. 1, the present invention provides an ultrasonic oil level monitoring device for a transformer (referred to as an ultrasonic oil level monitoring device for a transformer for short) based on a narrow-band internet of things technology, the device includes: ultrasonic wave oil level sensor module 3, microprocessor 1, wireless communication module 2, power module 7 and switch module 6.
The ultrasonic oil level sensor module 3 is located above the oil level of the transformer conservator and used for detecting the height of the oil level. Ultrasonic wave oil level sensor module 3 is to the oil level transmission ultrasonic wave, and the ultrasonic wave returns after passing to the oil level ultrasonic wave oil level sensor module 3. Ultrasonic wave oil level sensor module 3 can further realize the survey of difference to the oil level transmission ultrasonic signal in different position. The frequency of the ultrasonic emission can be adjusted, so that the fixed-point detection can be realized, and the continuous detection of different points can be carried out. In the present embodiment, the ultrasonic fuel level sensor module 3 includes an ultrasonic sensor.
The microprocessor 1 (namely a main control chip MCU) is connected with the ultrasonic oil level sensor module 3, the microprocessor 1 controls the ultrasonic oil level sensor module 3 to work, and oil level data or oil amount information is obtained by processing according to the time interval from the sending to the receiving of ultrasonic waves by the ultrasonic oil level sensor module 3.
For example, the oil level information may be converted in the following manner: the liquid level distance is calculated by the formula L ═ C × T/2, where L is the distance from the ultrasonic level sensor module 3 to the liquid level, C is the ambient sound velocity, and T is the ultrasonic transmission time, i.e., the time interval T. Wherein, the formula of temperature compensation of sound velocity is as follows: the ambient sound velocity is 331.5+0.6 × ambient temperature, and the current ambient sound velocity C is obtained.
The wireless communication module 2 is connected with the microprocessor 1, the wireless communication module 2 comprises a Narrow-Band Internet of Things (NB-IOT, which is an important branch of the Internet of everything) module, and the microprocessor 1 transmits oil level data or oil amount information to a terminal server through the Narrow-Band Internet of Things module. According to the practical application condition, the terminal server can send instruction information to the microprocessor 1 through the wireless communication module 2 so as to adjust, control and monitor the condition.
Optionally, the wireless communication module 2 is connected to the microprocessor 1 in a TTL (Transistor-Transistor Logic level-Transistor Logic) serial port manner.
The power module 7 supplies power to each equipment module. In the present embodiment, the power module 7 is a lithium subcell (19000 mAH). The switch module 6 is connected with the power module 7, and the switch module 6 is used for controlling the power-on or power-off of each device.
Based on the characteristic that the ultrasonic waves are reflected on the medium interfaces with different acoustic impedance ratios, the ultrasonic oil level sensor module 3 reflects the modulated ultrasonic waves on the interfaces of liquid (transformer oil) and gas (or vacuum environment) or solid (such as a capsule of an oil conservator), so that the generated echo is received by the ultrasonic oil level sensor module 3, and the microprocessor 1 can obtain oil level data or an oil amount signal of the oil conservator according to the time from sending to receiving of the ultrasonic oil level sensor module 3. The wireless communication module 2 is used for transmitting the oil quantity signal processed by the microprocessor 1 to a terminal server in real time so as to monitor the oil quantity of the conservator of the transformer in real time.
To ensure the reliability of signal transmission and enrich the signal transmission paths, the wireless communication module 2 of this embodiment further includes: a GPS module and several ANT antennas 8. The GPS module is used to determine the positioning information of the transformer and transmit it to the microprocessor 1. Each ANT antenna 8 is respectively connected with the GPS module and the narrow-band Internet of things module so as to realize the information transmission of the GPS module and the narrow-band Internet of things module.
Further, the wireless communication module 2 further includes a SIM card circuit. The SIM card circuit is connected to a SIM (Subscriber Identity module) card 9, and the SIM card circuit is used for sending information to the SIM card 9, and the SIM card circuit can provide data traffic and network services. In this way, the oil level information can be stored and uploaded in real time by means of the inserted SIM card 9. In another implementation, a temperature sensor can be further arranged to measure oil temperature information of the oil, and the oil temperature information is transmitted to the terminal server or the SIM card 9 end in combination with the wireless communication module 2.
The ultrasonic oil level monitoring device for the transformer of the present invention further comprises: a first power supply driving module 4. The two ends of the first power supply driving module 4 are respectively connected with the switch module 6 and the microprocessor 1, and the first power supply driving module 4 supplies power to the microprocessor 1 to drive the microprocessor 1 to work. In this embodiment, the first power supply driving module 4 is a 3.3V power supply circuit module.
The ultrasonic oil level monitoring device for the transformer of the present invention further comprises: and a second power supply driving module 5. The two ends of the second power supply driving module 5 are respectively connected with the switch module 6 and the ultrasonic oil level sensor module 3, and the second power supply driving module 5 supplies power to the ultrasonic oil level sensor module 3 to drive the ultrasonic oil level sensor module 3 to work. In this embodiment, the second power supply driving module 5 is a 12V power supply circuit module.
Further, the ultrasonic oil level monitoring device for the transformer of the present invention further comprises: and a fault alarm device. The fault alarm device is connected with the microprocessor 1 and outputs fault alarm according to the information output by the microprocessor 1. When the oil conservator or the ultrasonic oil level sensor module 3 breaks down, and the oil level or the oil temperature is abnormal, the fault alarm device carries out on-site alarm or remote alarm. Depending on the field environment, in the present embodiment, the malfunction alerting device includes an audible and visual alarm.
Each circuit or component of this embodiment can adopt current any circuit or component that have similar function according to actual conditions, on the basis of realizing whole monitoring devices structure and function, reduces whole monitoring devices's cost and guarantees the security, the accuracy nature of detector.
In summary, the ultrasonic oil level monitoring device for the intelligent transformer based on the narrow-band internet of things combines the ultrasonic oil level sensor module 3, the microprocessor 1, the wireless communication module 2, the power module 7, the switch module 6 and other components, so that the non-contact measurement of the oil level of the transformer conservator is realized.
Furthermore, in the intelligent ultrasonic oil level monitoring device for the transformer based on the narrow-band internet of things technology, the installation position of the ultrasonic oil level sensor module 3 is adjustable, positioning and fixing installation can be performed, remote control is performed by the switch module 6, the first power supply driving module 4 and the second power supply driving module 5, and the position of the ultrasonic oil level sensor module 3 can be changed for mobile temporary detection.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. The utility model provides an ultrasonic wave oil level monitoring devices for transformer based on narrowband internet of things, its characterized in that contains:
the ultrasonic oil level sensor module is positioned above the oil surface of the transformer oil conservator, transmits ultrasonic waves to the oil surface, and returns to the ultrasonic oil level sensor module after the ultrasonic waves are transmitted to the oil surface;
the microprocessor is connected with the ultrasonic oil level sensor module, controls the ultrasonic oil level sensor module to work, and processes the ultrasonic oil level sensor module according to the time interval from sending to receiving of ultrasonic waves to obtain oil level data or oil amount information;
the wireless communication module is connected with the microprocessor and comprises a narrow-band Internet of things module, and the microprocessor transmits oil level data or oil amount information to the terminal server through the narrow-band Internet of things module;
the power supply module supplies power to each equipment module;
and the switch module is connected with the power supply module and is used for controlling the power-on or power-off of each device.
2. The ultrasonic oil level monitoring device for the transformer based on the narrowband internet of things technology of claim 1, wherein the wireless communication module further comprises:
the GPS module is used for measuring the positioning information of the transformer and transmitting the positioning information to the microprocessor;
and the plurality of ANT antennas are respectively connected with the GPS module and the narrow-band Internet of things module so as to realize the information transmission of the GPS module and the narrow-band Internet of things module.
3. The ultrasonic oil level monitoring device for the transformer based on the narrowband internet of things technology of claim 1 or 2, wherein the wireless communication module further comprises:
and the SIM card circuit is connected with the SIM card and is used for sending information to the SIM card.
4. The ultrasonic oil level monitoring device for the transformer based on the narrow-band internet of things technology as claimed in claim 1, further comprising:
and two ends of the first power supply driving module are respectively connected with the switch module and the microprocessor, and the first power supply driving module supplies power to the microprocessor to drive the microprocessor to work.
5. The ultrasonic oil level monitoring device for the narrow-band Internet of things technology-based transformer of claim 4,
the first power supply driving module is a 3.3V power supply circuit module.
6. The ultrasonic oil level monitoring device for the transformer based on the narrow-band internet of things technology as claimed in claim 1, further comprising:
and the two ends of the second power supply driving module are respectively connected with the switch module and the ultrasonic oil level sensor module, and the second power supply driving module supplies power to the ultrasonic oil level sensor module to drive the ultrasonic oil level sensor module to work.
7. The ultrasonic oil level monitoring device for the narrow-band Internet of things technology-based transformer of claim 6,
the second power supply driving module is a 12V power supply circuit module.
8. The ultrasonic oil level monitoring device for the transformer based on the narrow-band internet of things technology as claimed in claim 1, further comprising:
and the fault alarm device is connected with the microprocessor, and when the oil conservator or the ultrasonic oil level sensor module breaks down and the oil level or the oil temperature is abnormal, the fault alarm device carries out field alarm or remote alarm.
9. The ultrasonic oil level monitoring device for the narrow-band Internet of things technology-based transformer of claim 8,
the fault alarm device comprises an audible and visual alarm.
10. The ultrasonic oil level monitoring device for the narrow-band Internet of things technology-based transformer of claim 1,
the wireless communication module is connected with the microprocessor in a TTL serial port mode;
and/or the ultrasonic oil level sensor module comprises an ultrasonic sensor;
and/or the power module is a lithium subcell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110285472.6A CN113029291A (en) | 2021-03-17 | 2021-03-17 | Ultrasonic oil level monitoring device for transformer based on narrow-band Internet of things technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110285472.6A CN113029291A (en) | 2021-03-17 | 2021-03-17 | Ultrasonic oil level monitoring device for transformer based on narrow-band Internet of things technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114355251A (en) * | 2021-11-22 | 2022-04-15 | 深圳供电局有限公司 | Transformer state parameter acquisition device and transformer start-stop monitoring system |
| CN115507918A (en) * | 2022-09-27 | 2022-12-23 | 戴天智能科技（上海）有限公司 | Transformer oil level detection method and system based on ultrasonic principle |
| CN117146934A (en) * | 2023-08-31 | 2023-12-01 | 陕西声科电子科技有限公司 | Oil level gauge for power transformer oil conservator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63113709A (en) * | 1986-10-31 | 1988-05-18 | Shinko Electric Co Ltd | Power supply controller for mobile robot |
| CN105043506A (en) * | 2015-06-02 | 2015-11-11 | 林聪� | Ultrasonic oil conservator oil level detector for power transformer |
| CN105738902A (en) * | 2014-12-08 | 2016-07-06 | 西安天动数字科技有限公司 | Parking detection device |
| CN105784071A (en) * | 2016-04-26 | 2016-07-20 | 江苏省电力公司常州供电公司 | Oil level ultrasonoscope for transformer oil conservator |
-
2021
- 2021-03-17 CN CN202110285472.6A patent/CN113029291A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63113709A (en) * | 1986-10-31 | 1988-05-18 | Shinko Electric Co Ltd | Power supply controller for mobile robot |
| CN105738902A (en) * | 2014-12-08 | 2016-07-06 | 西安天动数字科技有限公司 | Parking detection device |
| CN105043506A (en) * | 2015-06-02 | 2015-11-11 | 林聪� | Ultrasonic oil conservator oil level detector for power transformer |
| CN105784071A (en) * | 2016-04-26 | 2016-07-20 | 江苏省电力公司常州供电公司 | Oil level ultrasonoscope for transformer oil conservator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114355251A (en) * | 2021-11-22 | 2022-04-15 | 深圳供电局有限公司 | Transformer state parameter acquisition device and transformer start-stop monitoring system |
| CN115507918A (en) * | 2022-09-27 | 2022-12-23 | 戴天智能科技（上海）有限公司 | Transformer oil level detection method and system based on ultrasonic principle |
| CN117146934A (en) * | 2023-08-31 | 2023-12-01 | 陕西声科电子科技有限公司 | Oil level gauge for power transformer oil conservator |
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Effective date of registration: 20211014 Address after: 1122 Yuanshen Road, Pudong New Area, Shanghai, 200126 Applicant after: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Applicant after: EAST CHINA ELECTRIC POWER TEST AND RESEARCH INSTITUTE Co.,Ltd. Applicant after: SHANGHAI SHENGLUN ELECTRICAL EQUIPMENT Co.,Ltd. Address before: 1122 Yuanshen Road, Pudong New Area, Shanghai, 200126 Applicant before: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Applicant before: EAST CHINA ELECTRIC POWER TEST AND RESEARCH INSTITUTE Co.,Ltd. Applicant before: DAI TIAN INTELLIGENCE TECHNOLOGY (SHANGHAI) Co.,Ltd. |
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Application publication date: 20210625 |