CN208848066U - A kind of intelligent water supply control system based on LoRA spread spectrum mode networking - Google Patents
A kind of intelligent water supply control system based on LoRA spread spectrum mode networking Download PDFInfo
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- CN208848066U CN208848066U CN201821577743.5U CN201821577743U CN208848066U CN 208848066 U CN208848066 U CN 208848066U CN 201821577743 U CN201821577743 U CN 201821577743U CN 208848066 U CN208848066 U CN 208848066U
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- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 230000006855 networking Effects 0.000 title claims abstract description 27
- 238000001228 spectrum Methods 0.000 title claims abstract description 23
- 238000004891 communication Methods 0.000 claims abstract description 148
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- 230000003321 amplification Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
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- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
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Abstract
The utility model discloses a kind of intelligent water supply control systems based on LoRA spread spectrum mode networking, the intelligent water supply control system includes several water tanks, at least one LoRA radio network gateway and a remote server and the water inlet pipe for being connected to water tank top, be connected to water that water tank bottom end goes out in total on more branch's outlet pipes and the intelligent control box that is arranged on water storage box outer wall, it is provided on water inlet pipe into water control valve and discharge sensor, outlet water control valve and water flow sensor are provided on every branch's outlet pipe, the intelligent control box includes the MCU central controller being set in intelligent control box, LoRA communication module, card reader and dimensional code scanner.The utility model carries out networking by using LoRA communication and realizes real time communication, and networking mode is simpler and more direct, and anti-interference ability is stronger, and equipment transmission does not need largely to be routed, and effectively saves the labour of operator, reduces labor intensity.
Description
Technical field
The utility model belongs to water supply control technology field more particularly to a kind of intelligence based on LoRA spread spectrum mode networking
Water management system.
Background technique
With the rapid development of Internet of Things and wireless communication technique, people are inseparable with information network, channel radio
Letter plays an increasingly important role in people's lives, and it is the U.S. that LoRa, which is one of LPWAN communication technology,
A kind of overlength distance wireless transmission scheme based on spread spectrum that Semtech company uses and promotes, this scheme change
Mode is considered about the compromise of transmission range and power consumption in the past, is provided one kind for user and is simply able to achieve remote and large capacity
System, and then the covering scale of extended network, the LoRA communication technology are all widely applied in every field.Existing confession
Water control system mostly uses the mode of this communication to run, and in school student management of the use of water field using inner, mainly uses mechanical water
Table, the contactless valve control water meter of IC contact and conventional radio frequency radio remote transmitting water meter etc. are monitored water system, Er Qiejing
Serious water behavior steathily can often be encountered；It cannot achieve long-range monitoring for mechanical water meter, a large amount of manpower and material resources can be consumed
Meter reading is carried out, and water system is installed and may require that a large amount of wiring, the contactless valve control water meter of IC contact and conventional radio frequency
Radio remote transmitting water meter can efficiently solve wiring problem, but communication distance is close, and anti-interference is poor, and when installation needs a large amount of net
It closes and relays, and water system installation cost is high, operation communication cost is expensive, complex management, in order to be carried out to for water management
Supervision is monitored and is avoided in real time water behavior steathily to water control terminal it is necessary to which water control terminal is accessed Real Time Communication Network
It generates, while reducing installation cost and management operating cost, to become confession using low-power consumption long-distance radio communication technology
Water control system hot issue urgently to be solved.
Utility model content
The purpose of this utility model is to provide a kind of intelligent water supply control systems based on LoRA spread spectrum mode networking, originally
Utility model quickly can carry out Quick Acquisition and metering to water data and avoid stealing to monitor water system in real time
The generation of water behavior, and the water data of acquisition is uploaded to long-range server in real time, data transmission is expanded using based on LoRA
Frequency communication mode networking carries out real time communication, and networking mode is simpler and more direct, has coverage distance remote, to achieve the goals above, this
Utility model uses following technical effect:
According to the one aspect of this hair utility model, a kind of intelligent water supply control based on LoRA spread spectrum mode networking is provided
System processed, the intelligent water supply control system include several water tanks, at least one LoRA radio network gateway and a long-range clothes
Business device and be connected to the water inlet pipe on water tank top, be connected to water tank bottom end go out water in total on more branch's outlet pipes
With the intelligent control box being arranged on water storage box outer wall, it is provided on water inlet pipe into water control valve and discharge sensor,
Outlet water control valve and water flow sensor are provided on every branch's outlet pipe, the intelligent control box includes being set to intelligence
Can control MCU central controller, LoRA communication module, card reader and the dimensional code scanner in box, it is described enter water control valve, enter
Water flow sensor, outlet water control valve, water flow sensor, LoRA communication module, card reader and dimensional code scanner difference
It is connect by data line with the MCU central controller, the MCU central controller is wireless by LoRA communication module and LoRA
Gateway is communicatively coupled with the remote server.
Above scheme it is further preferred that the intelligent control box further includes first control circuit and second control circuit,
First control output end of the MCU central controller by first control circuit and it is described enter water control valve be electrically connected, institute
The second control output end for stating MCU central controller is electrically connected by second control circuit and the outlet water control valve.
Above scheme in water tank it is further preferred that be fixed with water level sensor and temperature sensor, the water level
Sensor and temperature sensor pass through data line respectively and connect with the MCU central controller.
Above scheme on the water inlet pipe of the discharge sensor front end it is further preferred that be additionally provided with to enter manually
Water valve is additionally provided with manual water outlet valve on the outlet pipe of water flow sensor rear end.
Above scheme is it is further preferred that when the LoRA radio network gateway is multiple, phase between each LoRA radio network gateway
Mutual group-net communication, each LoRA radio network gateway include communication control unit, LoRA communication unit, wifi communication unit and remote
Journey wireless communication unit, the LoRA communication form unit, wifi communication unit and remote radio communication units lead to described respectively
Letter control unit is communicatively coupled, the communication control unit by remote radio communication units and the remote server into
Row communicates to connect, the mutual group-net communication of LoRA communication unit in each LoRA radio network gateway, the communication control unit
It is carried out wireless communication and is connect with the MCU central controller by LoRA communication unit and LoRA communication module.
Above scheme is it is further preferred that the LoRA communication unit includes LoRA radio communication chip and radio communication day
Line, LoRA radio communication chip passes sequentially through radio communication antenna and LoRA communication module and the MCU central controller carries out
Wireless communication connection.
Above scheme it is further preferred that the LoRA radio communication chip using 470MHz~510MHz common frequency band into
Row group-net communication.
Above scheme it is further preferred that the LoRA communication module and the MCU central controller by SPI interface or
CAN interface carries out real time communication connection.Above scheme it is further preferred that
Above scheme is it is further preferred that the remote radio communication units are that GPRS communication unit or 3G/4G/5G are communicated
Unit.
In conclusion the utility model has following technical effect that since the utility model uses above-mentioned technical proposal
(1), be originally applicable in it is novel Quick Acquisition and metering quickly can be carried out to water data, to be carried out to water system
Real time monitoring, avoids the generation of water behavior steathily, and the water data of acquisition is uploaded to long-range server in real time, data transmission
Real time communication is carried out using based on the networking of LoRA spread spectrum communication mode, networking mode is simpler and more direct, has coverage distance remote, safety
Height, anti-interference ability is stronger, does not need largely to be routed, and effectively saves the labour of operator, reduces labor intensity.
It is (2), provided by the utility model that swipe the card by two-dimensional code scanning or IC card scanning for water control system can be complete
Water supply consumption is carried out at payment, simplifies payment process, one of means of payment is selected according to the demand of water according to student
Water supply consumption is carried out, means of payment diversification better meets the demand of water user.To also avoid the generation of water behavior steathily,
This water management system is scientific and reasonable for structure, simple to operate, highly-safe and convenient.
Detailed description of the invention
Fig. 1 is a kind of principle signal of the intelligent water supply control system based on LoRA spread spectrum mode networking of the utility model
Figure；
Fig. 2 is this practical LoRA spread spectrum mode group-net communication schematic diagram；
Fig. 3 is the communication control schematic diagram of this practical intelligent control box and LoRA radio network gateway；
In attached drawing, 1- water tank, 2-LoRA radio network gateway, 3- remote server, 4- water inlet pipe, 5- branch outlet pipe, 6-
Intelligent control box, 7- water level sensor, 8- temperature sensor, 9- smart phone, 20- communication control unit, 21-LoRA communication unit
Member, 22-wifi communication unit, 23- remote radio communication units, 40- enter water control valve, 41- discharge sensor, 42- hand
It moves into water valve, 50- outlet water control valve, 51- water flow sensor, 52- manual water outlet valve, 60-MCU central controller, 61-
LoRA communication module, 62- card reader, 63- dimensional code scanner, 64- first control circuit, 65- second control circuit.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, referring to the drawings and enumerate excellent
Embodiment is selected, the utility model is further described.However, it is necessary to illustrate, many details listed in specification
It is specific even without these just for the sake of making reader have a thorough explanation to the one or more aspects of the utility model
Details also may be implemented the utility model these aspect.
As shown in Figure 1, Figure 2 and Figure 3, according to a kind of intelligence based on LoRA spread spectrum mode networking provided by the utility model
Water management system, the intelligent water supply control system include several water tanks 1, at least one LoRA radio network gateway 2 and one
A remote server 3 and be connected to the water inlet pipe 4 on 1 top of water tank, be connected to 1 bottom end of water tank water outlet in total on it is more
Root branch outlet pipe 5 and the intelligent control box 6 being arranged on 1 outer wall of water tank, are provided with into water control valve 40 on water inlet pipe 4
With discharge sensor 41, outlet water control valve 50 and water flow sensor 51, institute are provided on every branch's outlet pipe 5
Stating intelligent control box 6 includes the MCU central controller 60 being set in intelligent control box 6, LoRA communication module 61, card reader 62
With dimensional code scanner 63, water intaking person selects to swipe the card according to demand or the two-dimensional code scanning means of payment is paid, and realizes automatic
It supplies water and sells, to preferably meet the demand of payment water supply consumption.It is described enter water control valve 40, discharge sensor
41, outlet water control valve 50, water flow sensor 51, LoRA communication module 61, card reader 62 and dimensional code scanner 63 are distinguished
It is connect by data line with the MCU central controller 60, the MCU central controller 60 passes through 61 He of LoRA communication module
LoRA radio network gateway 2 is communicatively coupled with the remote server 3；Water level sensor 7 and temperature are fixed in water tank 1
Sensor 8, the water level sensor 7 and temperature sensor 8 are connect by data line with the MCU central controller 60 respectively,
The water level sensor 7 is used to measure the height of water level in water tank 1, when water level is lower than the warning height in water tank 1, opens
It opens and carries out moisturizing into water control valve, discharge sensor 41 measures the discharge of water inlet pipe 4, the outlet water control valve at this time
50 for controlling the output control of branch's outlet pipe 5, and the water flow sensor 51 is discharged for measurement branches outlet pipe 5
Flow；The temperature sensor 8 is used to measure the coolant-temperature gage in water tank 1, (is lower than when setting temperature is not achieved in the temperature of water
At 65 DEG C), outlet water control valve 50 is not turned on, and carries out stopping heating when heating operation reaches 100 DEG C to the water in water tank 1；
It is additionally provided on the water inlet pipe 4 of 41 front end of discharge sensor and enters water valve 42 manually, it is right by entering water valve 42 manually
The water of water inlet pipe carries out overall control, is additionally provided with manual water outlet on the outlet pipe 5 of 41 rear end of water flow sensor
Valve 52 has hand to open manual water outlet valve, the water of available branch's outlet pipe outflow, at this after outlet water control valve 50 is opened
In utility model, needs to install 3 to 5 outlet valves on the outfall sewer of 1 bottom end of water tank, branch's outlet pipe 5 is distinguished
It is mounted in total outlet pipe, then outlet water control valve 50 and water flow sensor 51 is numbered, and also respectively to storage
On each water inlet pipe 4 of water tank 1 enter water control valve 40 and discharge sensor 41 is numbered, thus make the center MCU control
The control command that device 60 processed exports controls outlet water control valve and flow sensor；The intelligent control box 6 further includes
First control output end of one control circuit 64 and second control circuit 65, the MCU central controller 60 passes through the first control
Circuit 64 and it is described enter water control valve 40 be electrically connected, the second control output end of the MCU central controller 60 passes through second
Control circuit 65 has the electrical connection of outlet water control valve 50 with described, and the first control circuit 64 and second control circuit 65 are distinguished
Including pre-driver amplifying circuit, optical coupling isolator and postposition drive amplification circuit, wherein the first of MCU central controller 60
Control output end exports after being sequentially connected with corresponding pre-driver amplifying circuit, optical coupling isolator and postposition drive amplification circuit
Driving signal to enter water control valve 40 carry out open or close control, the second control output end of MCU central controller 60 with
The driving signal pair that corresponding pre-driver amplifying circuit, optical coupling isolator and postposition drive amplification circuit export after being sequentially connected
Outlet water control valve 50 carries out closure or openness control, wherein pre-driver amplifying circuit and postposition drive amplification circuit all use
Triode realizes the closure or openness control of control valve as drive amplification pipe.
In the present invention, in conjunction with Fig. 1, Fig. 2 and Fig. 3, the LoRA radio network gateway 2 include communication control unit 20,
LoRA communication unit 21, wifi communication unit 22 and remote radio communication units 23, the LoRA communication form unit 21, wifi are logical
Letter unit 22 and remote radio communication units 23 are communicatively coupled with the communication control unit 20 respectively, the communication control
Unit 20 is communicatively coupled by remote radio communication units 20 with the remote server 3, the communication control unit 20
It is carried out wireless communication and is connect with the MCU central controller 60 by LoRA communication unit 21 and LoRA communication module 61, it is described
LoRA communication unit includes LoRA radio communication chip and radio communication antenna, and it is logical that LoRA radio communication chip passes sequentially through radio frequency
Letter antenna and LoRA communication module are carried out wireless communication with the MCU central controller and are connect；The LoRA radio network gateway 2 is to use
The bridge between the intelligent control box 6 of water tank 1 and remote server 3 is connected, it in real time will by LoRA communication module 61
It is uploaded to remote server 3 with water management information, one or more water tanks 1, every 3~5 layers is arranged in each layer of students' dormitory
A LoRA radio network gateway 2 is arranged in raw dormitory, and the LoRA communication module 61 in each water tank can connect LoRA radio network gateway 2,
LoRA radio network gateway 2 can pass through wifi communication unit 22, GPRS communication unit directly facing remote server 3 and between each other
Or the paths such as 3G/4G/5G communication unit are communicated, and the water supply data of collected water tank 1 are turned by protocol converter
Be uploaded to LoRA radio network gateway 2 after changing and by LoRA communication module 61, and by LoRA radio network gateway by GPRS, WIFI or
4G/5G communication sends data to host computer；The MCU central controller 60 is using based on Cortex-M4 series
LPC4337 microcontroller, the communication control unit 20 uses the AM3356 core based on ARM Cortex-A8 microprocessor
Piece, the LoRA radio communication chip are carried out using SX1301 radio communication chip and using 470MHz~510MHz common frequency band
Networking spread spectrum communication, transmission range are down to -142.5dBm, the remote radio communication units up to 15km or more, sensitivity
GPRS unit or 3G/4G/5G communication unit, the LoRA communication module 61 pass through SPI interface with the MCU central controller 60
Or CAN interface carries out real time communication connection, the LoRA communication module 61 is logical using the SX1278 spread spectrum based on 433MHz
Believe that chip, the reachable -148dBm of peak response support 0.2kbps-37.5kbps air interface transmission rate, it is highly sensitive and high
The ability that signal-to-noise ratio makes LoRa communication module have highly resistance immunity, transmission range reach 3km or more, can solve data biography very well
The interference problem occurred during defeated.
In the present invention, in conjunction with Fig. 1, Fig. 2 and Fig. 3, when the LoRA radio network gateway 2 is multiple, each LoRA without
Gauze closes mutual group-net communication between 2, and each LoRA radio network gateway 2 includes communication control unit 20, LoRA communication unit
21, wifi communication unit 22 and remote radio communication units 23, LoRA communication form unit 21, wifi communication unit 22 and remote
Journey wireless communication unit 23 is communicatively coupled with the communication control unit 20 respectively, and the communication control unit 20 passes through remote
Journey wireless communication unit 20 is communicatively coupled with the remote server 3, and the LoRA in each LoRA radio network gateway 2 is logical
Believe that the mutual group-net communication of unit 21 reduces data transmission network to increase multiple independent spread spectrum communication local area network
Complexity increases the scale of wireless networking, and LoRA radio network gateway 2 receives the data sent from LoRA communication module 61
It is verified and is detected, then complete data forwarding into remote server 3, the communication control unit is communicated by LoRA
Unit 21 and LoRA communication module 61 are carried out wireless communication with the MCU central controller 60 to be connect, each LoRA radio network gateway 2
WLAN can be formed with multiple LoRA communication modules 61 to be communicated, LoRA radio network gateway 2 uses frequency hopping, carrier wave
The continuous interference for changing to prevent outer signals of frequency, carries out group-net communication using multiple LoRA radio network gateways, thus
To water tank 1 for water end (W.E.) is more dispersed or the farther away region of transmission range carries out networking, so that the scale covering surface of networking is bigger,
And mutual communication is not interfere with each other, and each gateway has voluntarily real-time judge and Automatic Optimal transmission link, very big
The cost of radio transmission apparatus, but also the application demand with large area covering have been saved in degree, and there is the network coverage
Height, flexible structure, high reliablity, versatile, construction are laid with advantage simple, easy to maintain, with other communication mode phases
Compare, signal ability through walls is stronger, can effectively reduce the usage quantity of trunking.
In conjunction with Fig. 1, Fig. 2 and Fig. 3, the working principle of the intelligent water supply control system of the utility model is further explained
It states, in students' dormitory, installable 1 to 3 water tank 1 of floor supply water and carries out real time measure control to the water consumption of student
System is swiped the card the amount of money in (IC card) operation and recording card when student needs with water by card reader 62, in IC card
Remaining sum, which meets MCU central controller 60 after consumption condition and can issue open command to outlet water control valve 50 and turn on, makes water logical
It crosses.When being unsatisfactory for watering condition, otherwise outlet water control valve 50 is not turned on, to not supply water outward, to the spending amount of water user,
Water consumption is measured and is controlled and is transmitted to consumption continuous data far by LoRA communication module 61 and LoRA radio network gateway 2
Journey server end 3, remote server 3 is for managing card and inquiry consumption data；It is scanned when using dimensional code scanner 63
When payment water intaking, need to open with the payment APP (wechat APP or Alipay APP) in smart phone 9, dimensional code scanner 63
The payment link two dimensional code on wechat APP or Alipay APP is scanned, payment amount is inputted and completes to pay, dimensional code scanner
The result of scanning payment can be uploaded to remote server 3 by 63, and the remote server 3 will be sent in MCU under payment result
Entreat controller 60,60 hand of MCU central controller to send payment result signal after and export water supply instruct make outlet water control valve 50
Unlatching discharges water, and outlet water control valve 50 is opened and strikes out the then water supply start of manual water outlet valve 52 with the hand, at this time water flow sensor
51 start to count water flow, and flow information is sent to MCU central controller 60 in real time and is uploaded to remote server 3,
After charge on traffic terminates, control command is closed in the output of MCU central controller 60 closes outlet water control valve 50, to complete reality
Now this consumption payment of supplying water is controlled.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without departing from the principle of this utility model, can also make several improvements and retouch, these improve and
Retouching also should be regarded as the protection scope of the utility model.
Claims (9)
1. a kind of intelligent water supply control system based on LoRA spread spectrum mode networking, it is characterised in that: the intelligent water supply control
System includes several water tanks, at least one LoRA radio network gateway and a remote server and is connected to water tank top
Water inlet pipe, be connected to water that water tank bottom end goes out in total on more branch's outlet pipes and the intelligence that is arranged on water storage box outer wall
It can control box, be provided on water inlet pipe into water control valve and discharge sensor, be provided on every branch's outlet pipe
Outlet water control valve and water flow sensor, the intelligent control box include the center the MCU control being set in intelligent control box
Device, LoRA communication module, card reader and dimensional code scanner, it is described enter water control valve, discharge sensor, go out water management
Valve, water flow sensor, LoRA communication module, card reader and dimensional code scanner pass through respectively in data line and the MCU
Controller connection is entreated, the MCU central controller passes through LoRA communication module and LoRA radio network gateway and the remote server
It is communicatively coupled.
2. a kind of intelligent water supply control system based on LoRA spread spectrum mode networking according to claim 1, feature exist
In: the intelligent control box further includes first control circuit and second control circuit, the first control of the MCU central controller
Output end by first control circuit and it is described enter water control valve be electrically connected, the MCU central controller second control it is defeated
Outlet is electrically connected by second control circuit and the outlet water control valve.
3. a kind of intelligent water supply control system based on LoRA spread spectrum mode networking according to claim 1, feature exist
In: water level sensor and temperature sensor are fixed in water tank, the water level sensor and temperature sensor pass through respectively
Data line is connect with the MCU central controller.
4. a kind of intelligent water supply control system based on LoRA spread spectrum mode networking according to claim 1, feature exist
In: it is additionally provided on the water inlet pipe of the discharge sensor front end and enters water valve manually, in the water flow sensor
Manual water outlet valve is additionally provided on the outlet pipe of rear end.
5. a kind of intelligent water supply control system based on LoRA spread spectrum mode networking according to claim 1, feature exist
In: when the LoRA radio network gateway is multiple, mutual group-net communication between each LoRA radio network gateway, each LoRA is wireless
Gateway includes communication control unit, LoRA communication unit, wifi communication unit and remote radio communication units, the LoRA communication
Form unit, wifi communication unit and remote radio communication units are communicatively coupled with the communication control unit respectively, described
Communication control unit is communicatively coupled by remote radio communication units and the remote server, and each LoRA is wireless
The mutual group-net communication of LoRA communication unit in gateway, the communication control unit communicate mould by LoRA communication unit and LoRA
Block is carried out wireless communication with the MCU central controller and is connect.
6. a kind of intelligent water supply control system based on LoRA spread spectrum mode networking according to claim 5, feature exist
In: the LoRA communication unit includes LoRA radio communication chip and radio communication antenna, and LoRA radio communication chip successively leads to
It crosses radio communication antenna and LoRA communication module and is carried out wireless communication with the MCU central controller and is connect.
7. a kind of intelligent water supply control system based on LoRA spread spectrum mode networking according to claim 6, feature exist
In: the LoRA radio communication chip carries out group-net communication using 470MHz~510MHz common frequency band.
8. a kind of intelligent water supply control system based on LoRA spread spectrum mode networking according to claim 6, feature exist
In: the LoRA communication module and the MCU central controller pass through SPI interface or CAN interface progress real time communication company
It connects.
9. a kind of intelligent water supply control system based on LoRA spread spectrum mode networking according to claim 5, feature exist
In: the remote radio communication units are GPRS communication unit or 3G/4G/5G communication unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821577743.5U CN208848066U (en) | 2018-09-27 | 2018-09-27 | A kind of intelligent water supply control system based on LoRA spread spectrum mode networking |
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| CN201821577743.5U CN208848066U (en) | 2018-09-27 | 2018-09-27 | A kind of intelligent water supply control system based on LoRA spread spectrum mode networking |
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Denomination of utility model: An intelligent water supply control system based on Lora spread spectrum networking Effective date of registration: 20200813 Granted publication date: 20190510 Pledgee: Nanning Nanfang Financing Guarantee Co.,Ltd. Pledgor: GUANGXI SHENNENGDA INTELLIGENT TECHNOLOGY Co.,Ltd. Registration number: Y2020450000031 |
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Date of cancellation: 20231011 Granted publication date: 20190510 Pledgee: Nanning Nanfang Financing Guarantee Co.,Ltd. Pledgor: GUANGXI SHENNENGDA INTELLIGENT TECHNOLOGY Co.,Ltd. Registration number: Y2020450000031 |