CN209132449U - A kind of automatic rainfall monitoring record and rainwater-sampling device - Google Patents
A kind of automatic rainfall monitoring record and rainwater-sampling device Download PDFInfo
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- CN209132449U CN209132449U CN201821662418.9U CN201821662418U CN209132449U CN 209132449 U CN209132449 U CN 209132449U CN 201821662418 U CN201821662418 U CN 201821662418U CN 209132449 U CN209132449 U CN 209132449U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The utility model discloses a kind of automatic rainfall monitoring record and rainwater-sampling devices, mainly include rainfall monitoring system, sampling system, PLC control and display system.Rainwater enters rainfall pipe through rainfall mouth, induces liquid level by pressure sensor, and signal real-time transmission is controlled and display system to the PLC;When rainfall pipe liquid level reaches the integral multiple of prompt sampling level intervals of setting, the alarm lamp of the PLC control and display system automatically turns on, the sampling system receives PLC control and the sampling of display system instruction, normally closed solenoid valve is closed after automatically opening 5~10s, rainwater in sampling bucket fully enters standard sampling bottle, artificial replacement standard sampling bottle simultaneously closes alarm lamp, completes primary sampling, system is automatically into next sampling period.The utility model has high degree of automation, precision height, samples timely, simple operation and other advantages, can satisfy the needs of production and scientific research.
Description
Technical field
The utility model belongs to rainfall monitoring and rainwater sampling technique field, is specifically related to a kind of automatic rainfall prison
Survey record and rainwater-sampling device.
Background technique
Rainwater as a kind of of great value water resource, it is used have save water resource, slow down flood,
The multi-meanings such as recharge of groundwater, control runoff pollution and improvement urban ecological environment.And accurate measurements Rainwater Quality is reasonable
Utilize rainwater resource, the important prerequisite of effectively control urban runoff pollution.Many scholars at home and abroad are to the diameter of different underlying surface
Stream Rainwater Quality is studied, but few with the research of rainfall situation of change to the water quality of natural rain, and it is main to study carefully it
The reason is that it is artificial difficult according to the practical operation of rainfall continuous acquisition rainwater sample, and there are biggish error and randomnesss.And
Rainfall gauge can only record rainfall and carry out point of natural rain in the case where cannot realizing a certain rainfall interval of setting simultaneously
Section acquisition.Therefore, one kind can continuously automatically record rainfall and accurately in the case where setting a certain rainfall interval from
The dynamic system for carrying out rainwater sampling is essential.This patent propose hereby a kind of new type auto rainfall monitoring record and
Rainwater sampling system.
Utility model content
The utility model is directed to during research natural rain water quality changes with rainfall, artificial according to rainfall quantitative change
It is difficult that change carries out sampling practical operation, lacks accuracy and timeliness, devise one kind can automatic and accurate record rainfall again
Can in the case where setting a certain rainfall interval automatic collection rainwater sample system.The utility model collection rainfall monitoring note
Record is collected in one with rainwater sample, has many advantages, such as that record is accurate, sampling is timely, simple and convenient for operation.
The utility model adopts the following technical solution: a kind of automatic rainfall monitoring record and rainwater-sampling device, mainly
Including rainfall monitoring system, sampling system, programmable logic controller (PLC) PLC control and display system three parts;
The rainfall monitoring system includes rainfall mouth, rainfall pipe, air-bubble level, tripod and pressure sensor;Rain
Water enters rainfall pipe through rainfall mouth, induces liquid level by pressure sensor, and signal real-time transmission to the PLC is controlled
And display system;When rainfall pipe liquid level reaches the integer of the prompt sampling level intervals of PLC control and display system setting
Times when, PLC control and display system automatically turn on alarm lamp and by sampled signal real-time transmissions to sampling system;
The sampling system includes sampling bucket, sampling platform, normally closed solenoid valve, headlamp, drainpipe, gas vent and mark
Quasi- sampling bottle;The sampling system is controlled according to PLC and the sampling of display system instructs, and normally closed solenoid valve automatically opens 5~
It is closed after 10s, the rainwater in sampling bucket fully enters standard sampling bottle, and it is artificial to replace standard sampling bottle and close alarm lamp, it is complete
At primary sampling, system is automatically into next period continuous sampling;
The PLC control and display system include main control module, man-machine interface and power supply;The main control module
The instruction set in the input signal and man-machine interface of real-time reception pressure sensor, by signal calculating be converted to PLC control and
Output is to man-machine interface after data needed for display system;The man-machine interface is system operatio panel, including alarm lamp, normally closed
Formula solenoid valve control knob, lighting lamp control knob, USB interface and system control and display window;The power supply is whole
A system provides stable electric power support;
Further, in the above scheme, the rainfall monitoring system, sampling system, PLC control and display system are adopted
It is designed with fissionization.The rainfall monitoring system, sampling system are located outside, and the PLC control and display system are located at room
In interior or tent.
Further, in the above scheme, the air-bubble level is set to transverse plane on tripod, rainfall mouth, rainfall
Pipe and pressure sensor are sequentially connected and vertical with transverse plane on tripod, and tripod is connected with rainfall pipe, be used for by rainfall mouth,
Rainfall pipe and pressure sensor are vertically fixed;The liquid level of the pressure sensor induction is 10~15 times of rainfall.
Further, in the above scheme, the pressure sensor has high-precision and high sensitivity, can be according to system
Setting, which instructs real-time monitoring and liquid level is converted to electric signal, is sent to PLC control and display system.
Further, in the above scheme, the sampling platform makes to sample bucket, normally closed solenoid valve, headlamp, draining
Pipe, gas vent and standard sampling bottle etc. are fixed, and guarantee that sampling bucket upper limb is horizontal.The normally closed solenoid valve, headlamp, draining
Pipe, standard sampling bottle are mounted under sampling platform, and the normally closed solenoid valve is set on drainpipe, and the headlamp passes through
Drainpipe is fixed;The standard sampling bottle is set to drainage pipe end, and gas vent is arranged on standard sample bottle cap.
Further, in the above scheme, the pressure sensor of rainfall monitoring system, the sampling system it is normal
Enclosed solenoid valve, headlamp are controlled by multidirectional water-proof cable with PLC and display system is connected;The pressure sensor,
Normally closed solenoid valve, headlamp, main control module, man-machine interface utilization voltage be 24V.
Further, in the above scheme, the reserved USB interface of the man-machine interface can realize the real-time note of monitoring data
It records and saves to USB flash disk, mobile hard disk or other magnetic mediums.
Further, in the above scheme, the system control of the man-machine interface and display window are mainly responsible for control
System is set and is carried out data record, including parameter setting window, system control window, data record window;The ginseng
Number setting window includes data record level intervals and sampling level intervals, and it includes that record is opened, record closes that system, which controls window,
Close, close alarm, zero calibration, accuracy correction, PLC reset, power supply, pull out USB flash disk key, data record window include the time, when
Between interval, rainfall, sampling sequence number.
Further, in the above scheme, sampling level intervals and record level intervals can be appointed by parameter setting window
Meaning setting can realize the flexibility of sampling according to rainfall intensity and sample requirement.
Further, in the above scheme, in the case where the sampling level intervals of setting are constant, the volume of sampling can lead to
Change sampling bucket internal diameter is crossed to be adjusted flexibly.
The beneficial effects of the utility model are: the utility model is on the basis to udometric function and principle grasp
On, a kind of automatic rainfall monitoring record and rainwater-sampling device of exploitation.The automatic rainfall monitoring record of the utility model
And rainwater sampling system can satisfy the needs of production and scientific research, has high degree of automation, precision height, samples timely, operation
The advantages that simple, can to avoid artificial sample non-timely and randomness, to improve the different rainfall plays of research, difference
Accuracy, comparativity of the natural rain water quality in area with rainfall changing rule, have very high application value.
1, high degree of automation: can be realized and automatically record rainfall in rainfall, automatic sampling and warning note is more
Standard sampling bottle is changed, compared with artificial sample, substantially increases the degree of automation.
2, high-precision: this equipment is by repeatedly calibration and calibration, and sensitive to the metering of rainfall accurate, systematic error is less than
± 4%.
3, the sampling interval is adjustable: the sampling level intervals of sample can arbitrarily be adjusted by man-machine interface, can be strong according to rainfall
Degree and sample requirement realize the flexibility of sampling.
4, sampling volume is adjustable: in the case where the sampling level intervals of setting are constant, the volume of sampling can pass through change
Sampling bucket internal diameter is adjusted flexibly.
5, it samples timely and convenient: level intervals can be sampled in the prompt of setting and sampled in time, saved human resources, mention
High sampling precision.
6, the single safety of power supply: 24V a-c transducer power supply is turned using 220V, 220V power frequency supply is after automatic conversion
The voltage of all electrical equipments is 24V, it can be ensured that rainy day safe operation.
7, easy communication: reserved USB interface can realize recording and saving in real time to USB flash disk, mobile hard disk for monitoring data
Or other magnetic mediums.
8, system reliability and high stability, remaining process is full-automatic in addition to it manually need to replace standard sampling bottle, only
Maintenance need to be inspected periodically.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model;
Fig. 2 is system control and display window schematic diagram in man-machine interface.
Wherein, 1- rainfall monitors system;2- rainfall mouth;3- rainfall pipe;4- air-bubble level;5- tripod;6- pressure
Sensor;7- sampling system;8- sampling bucket;9- sampling platform;10- normally closed solenoid valve;11- headlamp;12- drainpipe;13-
Exhaust outlet;14- standard sampling bottle;15-PLC control and display system;16- main control module;17- man-machine interface;18- alarm
Lamp;19- solenoid valve control knob;20- lighting lamp control knob;21-USB interface;The control of 22- system and display window;23- is supplied
Power supply;24- multiphase water-proof cable;25- parameter setting window;26- system controls window;27- data display window.
Specific embodiment
The utility model is further described in detail with reference to the accompanying drawings and detailed description.
As shown in Figure 1 a kind of automatic rainfall monitoring record and rainwater-sampling device mainly include rainfall monitoring system
System 1, sampling system 7, programmable logic controller (PLC) PLC control and display system 15;Rainfall monitor system 1 include rainfall mouth 2,
Rainfall pipe 3, air-bubble level 4, tripod 5 and pressure sensor 6, rainwater enters rainfall pipe 3 through rainfall mouth 2, by pressure sensing
Device 6 induces liquid level, and signal real-time transmission to PLC is controlled and display system 15;When 3 liquid level of rainfall pipe reaches
When the integral multiple for the prompt sampling level intervals that PLC is controlled and display system 15 is set, the PLC control and display system 15 are certainly
It is dynamic to open alarm lamp 18 and by sampled signal real-time transmission to sampling system 7;Sampling system 7 include sampling bucket 8, sampling platform 9,
Normally closed solenoid valve 10, headlamp 11, drainpipe 12, gas vent 13 and standard sampling bottle 14;Sampling system 7 is controlled according to PLC
And the sampling instruction of display system 15, normally closed solenoid valve 10 are closed after automatically opening 5~10s, the rainwater in sampling bucket 8 is whole
Into standard sampling bottle 14, artificial standard sampling bottle 14 of replacing simultaneously closes alarm lamp 18, completes primary sampling, system automatically into
Next sampling period;PLC control and display system 15 include main control module 16, man-machine interface 17 and power supply 23;It is described
The instruction set in the input signal and man-machine interface 17 of 16 real-time reception pressure sensor 6 of main control module, signal is calculated
Output is to man-machine interface after data needed for being converted to PLC control and display system 15;Man-machine interface 17 is system operatio panel,
Including the control of alarm lamp 18, solenoid valve control knob 19, lighting lamp control knob 20, USB interface 21 and system and display window
22;The system of man-machine interface 17 controls and display window 22 is mainly responsible for and is set to system and carry out data record;Power supply
Power supply 23 provides the electric power support for stablizing safety for whole system.Rainfall monitors system 1, sampling system 7, PLC control and shows
Show that system 15 is designed using fissionization.Rainfall monitoring system 1, sampling system 7 are located outside, PLC control and display system 15
In indoor or tent.
Wherein, air-bubble level 4 is set to transverse plane on tripod 5, rainfall mouth 2, rainfall pipe 3 and pressure sensor 6 according to
It is secondary connection and it is vertical with transverse plane on tripod 5, tripod 5 be connected with rainfall pipe 3, be used for by rainfall mouth 2, rainfall pipe 3 and press
Force snesor 6 is vertically fixed.The liquid level that pressure sensor 6 incudes is 10~15 times of rainfall, and pressure sensor has
High-precision and highly sensitive, real-time monitoring can be instructed according to default and liquid level is converted to electric signal is sent to
PLC control and display system 15.
Sampling platform 9 adopts sampling bucket 8, normally closed solenoid valve 10, headlamp 11, drainpipe 12, gas vent 13 and standard
Sample bottles 14 etc. are fixed, and guarantee that sampling 8 upper limbs of bucket are horizontal.Normally closed solenoid valve 10, headlamp 11, drainpipe 12, standard sample
Bottle 14 is mounted under sampling platform 9, and normally closed solenoid valve 10 is set on drainpipe 12, and headlamp 11 is solid by drainpipe 12
It is fixed, to provide illumination in insufficient light for replacement standard sampling bottle 14.Standard sampling bottle 14 is set to drainage pipe end, mark
Gas vent 13 is set on quasi- 14 bottle cap of sampling bottle, it is ensured that rainwater smoothly flows into standard sampling bottle 14.
The rainfall monitors the pressure sensor 6 of system, the normally closed solenoid valve 10 of the sampling system, headlamp 11
It is controlled by multidirectional water-proof cable 24 with PLC and display system 15 is connected;The pressure sensor 6, normally closed solenoid valve
10, headlamp 11, main control module 16, man-machine interface 17 utilization voltage be 24V.
The USB interface 21 that PLC control and display system 15 are reserved can realize recording and saving in real time to U for monitoring data
Disk, mobile hard disk or other magnetic mediums.
As shown in Fig. 2, the system control of man-machine interface 17 and display window 22 include parameter setting window 25, system control
Window 26, data record window 27.Parameter setting window 25 includes data record level intervals and sampling level intervals, system control
Window 26 processed includes that record is opened, record is closed, closes alarm, zero calibration, accuracy correction, PLC reset, power supply, pulls out USB flash disk
Key, data record window include time, time interval, rainfall, sampling sequence number.It samples level intervals and record level intervals can
It is arbitrarily set by parameter setting window 25, the flexibility of sampling can be realized according to rainfall intensity and sample requirement.In sample solution
In the case that bit interval is constant, the volume of sampling can be adjusted flexibly by changing sampling 7 internal diameters of bucket.
In the case where the sampling level intervals of setting are constant, the volume of sampling can be flexible by changing sampling 8 internal diameters of bucket
Adjustment.
Application method, comprising the following steps:
S1: the spacious flat position at outdoor selection one, installation rainfall monitor system, sampling system, adjustment installation
Keep bubble placed in the middle in the air-bubble level 4 of transverse plane on tripod 5, adjustment sampling platform 9 keeps sampling 8 upper limbs of bucket horizontal;
S2: PLC control and display system 15 are placed in indoor or tent, using multidirectional water-proof cable 24 by rainfall
Monitoring system 1, sampling system 7, PLC control and display system 15 connect, and click the power key of system control window 26, pass through ginseng
Number setting window 25 sets data record level intervals and prompt sampling level intervals, injects tap water to rainfall pipe 3, passes through people
The debugging of system is completed at machine interface 17, and USB flash disk is inserted into USB interface;
S3: when rainfall starts, first clicking the zero aligning key of system control window 26, then click record start button, institute
It states automatic rainfall monitoring record and rainwater sampling system 7 is started to work;
S4: with the accumulation of rainfall, 27 time of occurrence of data record window, rainfall duration, rainfall and sampling sequence number
Record data, when 3 liquid level of rainfall pipe reach parameter setting window 25 setting prompt sampling level intervals integral multiple
When, alarm lamp 18 automatically opens prompt replacement standard sampling bottle 14, and it is artificial to replace standard sampling bottle 14 and put closing alarm keys, it is complete
At primary sampling, next sampling period is hereafter carried out automatically.
S5: at the end of rainfall, the record stop key in PLC control and display system 15, the automatic rainfall are clicked
Monitoring record and rainwater sampling system stop working, and click pulls out USB flash disk key and closes power supply, complete the automatic of a catchment
Rainfall monitoring record and rainwater sampling operation.
Using above-mentioned monitoring system and method, calibration is simulated to the accuracy of rainfall monitoring system respectively and is gone forward side by side
Actual samples operation is gone, test result is shown in Table 1~4.As shown in Table 1, the measurement of the rainfall monitoring system of the utility model
Accuracy error is between ± 4%.By the actual monitoring situation of table 2~4 it is found that Tthe utility model system stabilization working properly,
It achieves the desired results.
The accuracy of 1 system of table
2 system automatic monitor for continuously of table record and sampling (2018.05.22)
3 system automatic monitor for continuously of table record and sampled result (2018.07.05)
4 system automatic monitor for continuously of table record and sampled result (2018.07.07-2018.07.08)
It should be understood that embodiment and example discussed herein simply to illustrate that, it will be understood by those skilled in the art that
It can be improved or converted, and all these modifications and variations all should belong to the protection scope of the appended claims for the utility model.
Claims (9)
1. a kind of automatic rainfall monitoring record and rainwater-sampling device, it is characterised in that: mainly include that rainfall monitors system
(1), sampling system (7), programmable logic controller (PLC) PLC control and display system (15);
Rainfall monitoring system (1) includes rainfall mouth (2), rainfall pipe (3), air-bubble level (4), tripod (5) and pressure
Force snesor (6);Rainwater enters rainfall pipe (3) through rainfall mouth (2), induces liquid level by pressure sensor (6), and will letter
Number real-time transmission is controlled to the PLC and display system (15);When rainfall pipe (3) liquid level reaches PLC control and display system
When the prompt that (15) are set of uniting samples the integral multiple of level intervals, PLC control and display system (15) automatically turn on alarm lamp
(18) and by sampled signal real-time transmission to sampling system (7);
The sampling system (7) includes sampling bucket (8), sampling platform (9), normally closed solenoid valve (10), headlamp (11), draining
Manage (12), gas vent (13) and standard sampling bottle (14);The sampling system (7) is controlled according to PLC and display system (15)
Sampling instruction, normally closed solenoid valve (10) are closed after automatically opening 5~10s, and the rainwater in sampling bucket (8) fully enters standard and adopts
Sample bottle (14) is manually replaced standard sampling bottle (14) and is closed alarm lamp (18), completes primary sampling, system is automatically into next
Sampling period;
The PLC control and display system (15) include main control module (16), man-machine interface (17) and power supply (23);Institute
The instruction set in the input signal and man-machine interface (17) of main control module (16) real-time reception pressure sensor (6) is stated, it will
Man-machine interface (17) are given in output after data needed for signal calculating is converted to PLC control and display system (15);The man-machine boundary
Face (17) is system operatio panel, including alarm lamp (18), normally closed solenoid valve control handle (19), lighting lamp control knob
(20), USB interface (21) and system control and display window (22);The power supply (23) is that 220V turns 24V exchange conversion
Device power supply, whole system provide stable electric power support.
2. a kind of automatic rainfall monitoring record according to claim 1 and rainwater-sampling device, it is characterised in that: described
Rainfall is monitored system (1), sampling system (7), PLC control and display system (15) and is designed using fissionization;The rainfall
Monitoring system (1), sampling system (7) are located outside, and the PLC control and display system (15) are located in indoor or tent.
3. a kind of automatic rainfall monitoring record according to claim 1 and rainwater-sampling device, it is characterised in that: described
Air-bubble level (4) is set to transverse plane on tripod (5), and rainfall mouth (2), rainfall pipe (3) and pressure sensor (6) successively connect
It connects and vertical with transverse plane on tripod (5), tripod (5) is connected with rainfall pipe (3), is used for rainfall mouth (2), rainfall pipe
(3) and pressure sensor (6) is vertically fixed;The liquid level of pressure sensor (6) induction is 10~15 times of rainfall.
4. a kind of automatic rainfall monitoring record according to claim 1 and rainwater-sampling device, it is characterised in that: described
Pressure sensor (6) according to default instruct real-time monitoring and by liquid level be converted to electric signal be sent to PLC control and
Display system (15).
5. a kind of automatic rainfall monitoring record according to claim 1 and rainwater-sampling device, it is characterised in that: described
Sampling platform (9) makes sampling bucket (8), normally closed solenoid valve (10), headlamp (11), drainpipe (12), gas vent (13) and mark
Quasi- sampling bottle (14) is fixed, and guarantees that sampling bucket (8) upper limb is horizontal;The normally closed solenoid valve (10), headlamp (11), draining
Pipe (12), standard sampling bottle (14) are mounted under sampling platform (9), and the normally closed solenoid valve (10) is set to drainpipe
(12) on, the headlamp (11) is fixed by drainpipe (12);The standard sampling bottle (14) is set to drainpipe (12) end
It holds, gas vent (13) is set on standard sampling bottle (14) bottle cap.
6. a kind of automatic rainfall monitoring record according to claim 1 and rainwater-sampling device, it is characterised in that: described
Rainfall monitors the pressure sensor (6) of system (1), the normally closed solenoid valve (10) of the sampling system (7), headlamp (11)
It is controlled by multidirectional water-proof cable (24) with PLC and display system is connected;The pressure sensor (6), normally closed type electromagnetism
Valve (10), headlamp (11), main control module (16), man-machine interface (17) utilization voltage be 24V.
7. a kind of automatic rainfall monitoring record according to claim 1 and rainwater-sampling device, it is characterised in that: described
Recording and saving in real time to magnetic medium for monitoring data can be achieved in the reserved USB interface (21) of man-machine interface (17).
8. a kind of automatic rainfall monitoring record according to claim 1 and rainwater-sampling device, it is characterised in that: described
The system of man-machine interface (17) controls and display window (22) is mainly responsible for and data record is set and carried out to control system,
Window (26), data record window (27) are controlled including parameter setting window (25), system;Parameter setting window (25) packet
Data record level intervals and sampling level intervals are included, it includes that record is opened, record is closed, closes report that system, which controls window (26),
Police, accuracy correction, PLC reset, power supply, pulls out USB flash disk key at zero calibration, and data record window (27) includes between time, time
Every, rainfall, sampling sequence number.
9. a kind of automatic rainfall monitoring record according to claim 1 and rainwater-sampling device, it is characterised in that: it is special
Sign is: in the case where the sampling level intervals of setting are constant, the volume of sampling can be flexible by changing sampling bucket (8) internal diameter
Adjustment.
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109521502A (en) * | 2018-10-12 | 2019-03-26 | 天津大学 | A kind of automatic rainfall monitoring record and rainwater sampling system and its application method |
CN110987744A (en) * | 2019-12-13 | 2020-04-10 | 黄东 | Monitoring and early warning device for outdoor raised dust and noise |
WO2022041968A1 (en) * | 2020-08-25 | 2022-03-03 | 力合科技(湖南)股份有限公司 | Liquid level monitoring device and sampling monitoring method |
CN114541311A (en) * | 2022-02-21 | 2022-05-27 | 郭丽云 | Automatic salt spreading device for preventing accumulated snow on road and using method thereof |
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2018
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109521502A (en) * | 2018-10-12 | 2019-03-26 | 天津大学 | A kind of automatic rainfall monitoring record and rainwater sampling system and its application method |
CN110987744A (en) * | 2019-12-13 | 2020-04-10 | 黄东 | Monitoring and early warning device for outdoor raised dust and noise |
CN110987744B (en) * | 2019-12-13 | 2022-04-26 | 黄东 | Monitoring and early warning device for outdoor raised dust and noise |
WO2022041968A1 (en) * | 2020-08-25 | 2022-03-03 | 力合科技(湖南)股份有限公司 | Liquid level monitoring device and sampling monitoring method |
CN114541311A (en) * | 2022-02-21 | 2022-05-27 | 郭丽云 | Automatic salt spreading device for preventing accumulated snow on road and using method thereof |
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