CN106249743A - A kind of real time water level supervising device for drainage system - Google Patents
A kind of real time water level supervising device for drainage system Download PDFInfo
- Publication number
- CN106249743A CN106249743A CN201610806250.3A CN201610806250A CN106249743A CN 106249743 A CN106249743 A CN 106249743A CN 201610806250 A CN201610806250 A CN 201610806250A CN 106249743 A CN106249743 A CN 106249743A
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- China
- Prior art keywords
- water level
- real time
- drainage system
- time water
- supervising device
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 34
- 238000005070 sampling Methods 0.000 claims abstract description 22
- 230000005611 electricity Effects 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 239000003063 flame retardant Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract description 10
- 238000012544 monitoring process Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots
- G05D1/04—Control of altitude or depth
-
- 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
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Aviation & Aerospace Engineering (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Automation & Control Theory (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The present invention relates to a kind of real time water level supervising device for drainage system, including indication mechanism, it is arranged on the infrared ambulator below indication mechanism and angle adjusting mechanism, described angle adjusting mechanism is in transmission connection with indication mechanism, this is used in the real time water level supervising device of drainage system, when transmission is frameed shift dynamic, driver element rotates, solenoid dead electricity, now solenoid is pulled up by telescope motor by expansion link, when moving to specify position, solenoid is put down by telescope motor, fixing bar will be withstood by solenoid, driver element is locked by fixing bar, thus it is achieved that accuracy and the stability of altitude mixture control；Moreover, in sampling hold circuit, by the circuit based on integrated circuit, the crest voltage of working power circuit is sampled, keep subsequently, ensure that internal circuit monitors guarantee to the sampling of working power constant, thus improve the stability of device work.
Description
Technical field
The present invention relates to a kind of real time water level supervising device for drainage system.
Background technology
In China, owing to territorial scope is wide, thus the distribution of water resource the most uneven with.In some areas, some areas by
In at excessive rainfall in rainy season, often because draining causes big flood not in time.Therefore, drainer is all added in these areas
Journey, ensures the reliability of draining, improves area flood control capacity.
In drainage system, partial drainage equipment does not works at Conventional Time, can open corresponding when different displacement
Drainage equipment, it is therefore desirable to water level is accurately monitored by water level monitor device.
In existing water level monitor device, the most all there is the ability of altitude mixture control, improve its practicality, but
The when of altitude mixture control, owing to lacking good locking mechanism, ensure stablizing of supervising device altitude mixture control, reduce device
Reliability；Moreover, device works when, working power often causes device to work not because of external disturbance
Stable, reduce its reliability.
Summary of the invention
The technical problem to be solved in the present invention is: in order to overcome the deficiencies in the prior art, it is provided that a kind of for drainage system
Real time water level supervising device.
The technical solution adopted for the present invention to solve the technical problems is: a kind of real time water level for drainage system monitors
Device, including indication mechanism, is arranged on the infrared ambulator below indication mechanism and angle adjusting mechanism, described angular adjustment
Mechanism is in transmission connection with indication mechanism；
Described angle adjusting mechanism includes that horizontal adjustment assembly and vertical adjusting assembly, described vertical adjusting assembly pass through water
Flat adjusting part is in transmission connection with indication mechanism；
Described vertical adjusting assembly includes transmission frame, column and four driver elements, and the vertical cross-section of described transmission frame is U
Shape, described U-shaped cross section opening down, one end of described column is arranged on the inside of transmission frame, and the both sides of described column are uniform
Being provided with fixing tooth, described driver element includes driving gear, and described driving gear engages with the fixing tooth of column；
The side of described driver element is provided with from lock set, described includes solenoid, limited block, spacing bullet from lock set
Spring, fixing bar, telescope motor and expansion link, described telescope motor is vertically provided at the top of solenoid and fixes with transmission frame
Connecting, described telescope motor is in transmission connection with solenoid by expansion link, and one end of described fixing bar is provided with jointed shaft and leads to
Crossing jointed shaft hinged with the inwall of transmission frame, the other end of described fixing bar is positioned at the top of the tooth driving gear, described spacing
Block is positioned at the lower section of fixing bar and is connected with fixing bar by limit spring, and described fixing bar is iron block；
The inside of described display structure is provided with working power module, and described working power module includes sampling hold circuit,
Described sampling hold circuit include integrated circuit, operational amplifier, the first resistance, the second resistance, the 3rd resistance, electric capacity, first
Diode, the second diode and audion, the model of described integrated circuit is LF398, the analog input of described integrated circuit
End is connected with the in-phase input end of operational amplifier, and the inverting input of described operational amplifier connects with the outfan of integrated circuit
Connect, the power end external 15V DC voltage power supply of described integrated circuit and by the 3rd resistance eutral grounding, patrolling of described integrated circuit
Collecting input control end to be connected with the outfan of operational amplifier, the outfan of described operational amplifier passes through the first resistance eutral grounding,
The plus earth of described first diode, the negative electrode of described first diode passes through the second resistance external 15V DC voltage power supply,
The outfan of described operational amplifier is connected with the logic reference edge of integrated circuit, and the sampling that connects of described integrated circuit keeps CH end
Being connected by the negative electrode of electric capacity and the first diode, the sampling that connects of described integrated circuit keeps CH end and the anode of the second diode
Connecting, the described negative electrode of the second diode is connected with the colelctor electrode of audion, the emitter stage of described audion and operational amplifier
Outfan connect.
As preferably, in order to ensure the accurate monitoring to water level, the quantity of described infrared ambulator is two, two institutes
State infrared ambulator and lay respectively at the both sides of horizontal adjustment assembly.
As preferably, in order to ensure that device can carry out levelness rotation, described horizontal adjustment assembly includes steer motor,
Described steer motor is in transmission connection with indication mechanism.
As preferably, in order to ensure that device can stably vertically move, four described driver elements are arranged on column two-by-two
Both sides, four described driver elements are arranged on the both sides up and down of column two-by-two.
As preferably, described indication mechanism includes LCDs.
As preferably, in order to ensure that device is remotely monitored by staff, the inside of described indication mechanism sets
Wireless communication module, described wireless communication module is had to include bluetooth.
As preferably, in order to improve the flying power of device, the inside of described indication mechanism is additionally provided with accumulator, described storage
Battery is trifluoro lithium battery.
As preferably, in order to improve the safe class of device, the flame retardant rating of described indication mechanism is V-0.
The invention has the beneficial effects as follows, this is used in the real time water level supervising device of drainage system, when transmission is frameed shift dynamic,
Driver element rotates, solenoid dead electricity, and now solenoid is pulled up by telescope motor by expansion link, when moving to specify
During position, solenoid is put down by telescope motor, and fixing bar will be withstood by solenoid, and driver element is locked by fixing bar,
Thus it is achieved that accuracy and the stability of altitude mixture control；Moreover, in sampling hold circuit, by with integrated circuit
The crest voltage of working power circuit is sampled by the circuit being main, keeps subsequently, it is ensured that internal circuit is to work
The sampling monitoring of power supply ensures constant, thus improves the stability of device work.
Accompanying drawing explanation
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of the real time water level supervising device for drainage system of the present invention；
Fig. 2 is the structural representation of the vertical adjusting assembly of the real time water level supervising device for drainage system of the present invention
Figure；
Fig. 3 is the structural representation from lock set of the real time water level supervising device for drainage system of the present invention；
Fig. 4 is the circuit theory of the sampling hold circuit of the real time water level supervising device for drainage system of the present invention
Figure；
In figure: 1. indication mechanism, 2. LCDs, 3. infrared ambulator, 4. horizontal adjustment assembly, 5. vertical adjusting
Assembly, 6. transmission frame, 7. column, 8. driver element, 9. from lock set, 10. telescope motor, 11. expansion links, 12. solenoids,
13. jointed shafts, 14. fix bar, 15. limit spring, 16. limited blocks, U1. integrated circuit, U2. operational amplifier, R1. the first electricity
Resistance, R2. the second resistance, R3. the 3rd resistance, C1. electric capacity, D1. the first diode, D2. the second diode, Q1. audion.
Detailed description of the invention
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, only with
The basic structure of the illustration explanation present invention, therefore it only shows the composition relevant with the present invention.
As Figure 1-Figure 4, a kind of real time water level supervising device for drainage system, including indication mechanism 1, it is arranged on
Infrared ambulator 3 below indication mechanism 1 and angle adjusting mechanism, described angle adjusting mechanism is with indication mechanism 1 transmission even
Connect；
Described angle adjusting mechanism includes that horizontal adjustment assembly 4 and vertical adjusting assembly 5, described vertical adjusting assembly 5 lead to
Cross horizontal adjustment assembly 4 to be in transmission connection with indication mechanism 1；
Described vertical adjusting assembly 5 includes transmission frame 6, column 7 and four driver elements 8, and the vertical of described transmission frame 6 cuts
Face is U-shaped, described U-shaped cross section opening down, and one end of described column 7 is arranged on the inside of transmission frame 6, described column 7
Both sides are uniformly provided with fixing tooth, and described driver element 8 includes driving gear, and described driving gear engages with the fixing tooth of column 7；
The side of described driver element 8 is provided with from lock set 9, described includes solenoid 12, limited block from lock set 9
16, limit spring 15, fixing bar 14, telescope motor 10 and expansion link 11, described telescope motor 10 is vertically provided at solenoid
The top of 12 and fixing with transmission frame 6 is connected, described telescope motor 10 passes through expansion link 11 and is in transmission connection with solenoid 12, institute
State one end of fixing bar 14 and be provided with jointed shaft 13 and hinged with the inwall of transmission frame 6 by jointed shaft 13, described fixing bar 14
The other end is positioned at the top of tooth driving gear, described limited block 16 be positioned at fixing bar 14 lower section and by limit spring 15 with
Fixing bar 14 connects, and described fixing bar 14 is iron block；
The inside of described display structure 1 is provided with working power module, and described working power module includes sampling hold circuit,
Described sampling hold circuit include integrated circuit U1, operational amplifier U2, the first resistance R1, the second resistance R2, the 3rd resistance R3,
Electric capacity C1, the first diode D1, the second diode D2 and audion Q1, the model of described integrated circuit U1 is LF398, described collection
The analog input end becoming circuit U 1 is connected with the in-phase input end of operational amplifier U2, and described operational amplifier U2's is anti-phase defeated
Enter end to be connected with the outfan of integrated circuit U1, the power end external 15V DC voltage power supply of described integrated circuit U1 and passing through
3rd resistance R3 ground connection, the logic input of described integrated circuit U1 controls end and is connected with the outfan of operational amplifier U2, described
The outfan of operational amplifier U2 pass through the first resistance R1 ground connection, the plus earth of described first diode D1, the described 1st
The negative electrode of pole pipe D1 passes through the second resistance R2 external 15V DC voltage power supply, and the outfan of described operational amplifier U2 is with integrated
The logic reference edge of circuit U 1 connects, and the sampling that connects of described integrated circuit U1 keeps CH end by electric capacity C1 and the first diode D1
Negative electrode connect, described integrated circuit U1 connects the anode connection that sampling keeps CH end and the second diode D2, the described 2nd 2
The negative electrode of pole pipe D2 is connected with the colelctor electrode of audion Q1, the emitter stage of described audion Q1 and the outfan of operational amplifier U2
Connect.
As preferably, in order to ensure the accurate monitoring to water level, the quantity of described infrared ambulator 3 is two, two
Described infrared ambulator 3 lays respectively at the both sides of horizontal adjustment assembly 4.
As preferably, in order to ensure that device can carry out horizontal 360-degree rotation, described horizontal adjustment assembly 4 includes turning to
Motor, described steer motor is in transmission connection with indication mechanism 1.
As preferably, in order to ensure that device can stably vertically move, four described driver elements 8 are arranged on column two-by-two
The both sides of 7, four described driver elements 8 are arranged on the both sides up and down of column 7 two-by-two.
As preferably, described indication mechanism 1 includes LCDs 2.
As preferably, in order to ensure that device is remotely monitored by staff, the inside of described indication mechanism 1 sets
Wireless communication module, described wireless communication module is had to include bluetooth.
As preferably, in order to improve the flying power of device, the inside of described indication mechanism 1 is additionally provided with accumulator, described
Accumulator is trifluoro lithium battery.
As preferably, in order to improve the safe class of device, the flame retardant rating of described indication mechanism 1 is V-0.
This is used in the real time water level supervising device of drainage system, indication mechanism 1, is used for showing relevant monitoring information,
Improve the practicality of device；Infrared ambulator 3, is used for accurately monitoring the water level of lower section；Angle adjusting mechanism, uses
Regulate the height of indication mechanism 1.In infrared ambulator 3, horizontal adjustment assembly 4 is used for regulating the level of indication mechanism 1
Angle, vertical adjusting assembly 5 is used for the vertical height of regulation indication mechanism 1, and driver element 8 is fixed on the interior of transmission frame 6
Wall, simultaneously drives unit 8 and is in transmission connection with column 7, then can be realized as the altitude mixture control of transmission frame 6.When being adjusted to specify height
When spending, driver element 8 will be locked from lock set 9, thus ensure that the stability of altitude mixture control, improve the reliable of device
Property.Wherein, when transmission frame 6 moves, driver element 8 rotates, and solenoid 12 dead electricity, now telescope motor 10 passes through expansion link
Solenoid 12 is pulled up by 11, and when moving to specify position, solenoid 12 is put down by telescope motor 10, and fixing bar 14 is just
Can be withstood by solenoid 12, driver element 8 is locked by fixing bar 14, thus is achieved that the accuracy of altitude mixture control and stablizes
Property.
This is used in the real time water level supervising device of drainage system, and working power module is used for each machine ensureing in device
Structure reliably working, improves the reliability of device.In sampling hold circuit, by the circuit based on integrated circuit U1 to work
The crest voltage making power circuit is sampled, and keeps subsequently, it is ensured that the sampling of working power is monitored by internal circuit
Ensure constant, thus improve the stability of device work.
Compared with prior art, this is used in the real time water level supervising device of drainage system, when transmission frame 6 moves, drives
Moving cell 8 rotates, solenoid 12 dead electricity, and now solenoid 12 is pulled up by telescope motor 10 by expansion link 11, works as fortune
When moving appointment position, solenoid 12 is put down by telescope motor 10, and fixing bar 14 will be withstood by solenoid 12, fixing bar
Driver element 8 is locked by 14, thus is achieved that accuracy and the stability of altitude mixture control；Moreover, electricity is kept in sampling
Lu Zhong, by sampling the crest voltage of working power circuit based on the circuit of integrated circuit U1, keeps subsequently,
Ensure that internal circuit monitors guarantee to the sampling of working power constant, thus improve the stability of device work.
With the above-mentioned desirable embodiment according to the present invention for enlightenment, by above-mentioned description, relevant staff is complete
Entirely can carry out various change and amendment in the range of without departing from this invention technological thought.The technology of this invention
The content that property scope is not limited in description, it is necessary to determine its technical scope according to right.
Claims (8)
1. the real time water level supervising device for drainage system, it is characterised in that include indication mechanism (1), be arranged on aobvious
Showing infrared ambulator (3) and the angle adjusting mechanism of mechanism (1) lower section, described angle adjusting mechanism passes with indication mechanism (1)
It is dynamically connected；
Described angle adjusting mechanism includes horizontal adjustment assembly (4) and vertical adjusting assembly (5), described vertical adjusting assembly (5)
It is in transmission connection with indication mechanism (1) by horizontal adjustment assembly (4)；
Described vertical adjusting assembly (5) includes transmission frame (6), column (7) and four driver elements (8), described transmission frame (6)
Vertical cross-section is U-shaped, described U-shaped cross section opening down, and one end of described column (7) is arranged on the inside of transmission frame (6), institute
The both sides stating column (7) are uniformly provided with fixing tooth, and described driver element (8) includes driving gear, described driving gear and column
(7) fixing tooth engagement；
The side of described driver element (8) is provided with from lock set (9), described includes solenoid (12), spacing from lock set (9)
Block (16), limit spring (15), fixing bar (14), telescope motor (10) and expansion link (11), described telescope motor (10) is vertical
Being arranged on the top of solenoid (12) and fixing with transmission frame (6) be connected, described telescope motor (10) is by expansion link (11)
Being in transmission connection with solenoid (12), one end of described fixing bar (14) is provided with jointed shaft (13) and by jointed shaft (13) and biography
The inwall of dynamic frame (6) is hinged, and the other end of described fixing bar (14) is positioned at the top of the tooth driving gear, described limited block (16)
Being positioned at the lower section of fixing bar (14) and be connected with fixing bar (14) by limit spring (15), described fixing bar (14) is iron block；
The inside of described display structure (1) is provided with working power module, and described working power module includes sampling hold circuit, institute
State sampling hold circuit include integrated circuit (U1), operational amplifier (U2), the first resistance (R1), the second resistance (R2), the 3rd
Resistance (R3), electric capacity (C1), the first diode (D1), the second diode (D2) and audion (Q1), described integrated circuit (U1)
Model be LF398, the analog input end of described integrated circuit (U1) is connected with the in-phase input end of operational amplifier (U2),
The inverting input of described operational amplifier (U2) is connected with the outfan of integrated circuit (U1), the electricity of described integrated circuit (U1)
Source external 15V DC voltage power supply and by the 3rd resistance (R3) ground connection, the logic input of described integrated circuit (U1) controls
End is connected with the outfan of operational amplifier (U2), and the outfan of described operational amplifier (U2) is connect by the first resistance (R1)
Ground, the plus earth of described first diode (D1), the negative electrode of described first diode (D1) is external by the second resistance (R2)
15V DC voltage power supply, the outfan of described operational amplifier (U2) is connected with the logic reference edge of integrated circuit (U1), described
The sampling that connects of integrated circuit (U1) keeps CH end to be connected with the negative electrode of the first diode (D1) by electric capacity (C1), described integrated electricity
The sampling that connects on road (U1) keeps the anode of CH end and the second diode (D2) to connect, the negative electrode and three of described second diode (D2)
The colelctor electrode of pole pipe (Q1) connects, and the emitter stage of described audion (Q1) is connected with the outfan of operational amplifier (U2).
2. the real time water level supervising device for drainage system as claimed in claim 1, it is characterised in that described infrared ray is surveyed
The quantity of distance meter (3) is two, and two described infrared ambulators (3) lay respectively at the both sides of horizontal adjustment assembly (4).
3. the real time water level supervising device for drainage system as claimed in claim 1, it is characterised in that described horizontal adjustment
Assembly (4) includes that steer motor, described steer motor are in transmission connection with indication mechanism (1).
4. the real time water level supervising device for drainage system as claimed in claim 1, it is characterised in that four described drivings
Unit (8) is arranged on the both sides of column (7) two-by-two, and four described driver elements (8) are arranged on up and down the two of column (7) two-by-two
Side.
5. the real time water level supervising device for drainage system as claimed in claim 1, it is characterised in that described indication mechanism
(1) LCDs (2) is included.
6. the real time water level supervising device for drainage system as claimed in claim 1, it is characterised in that described indication mechanism
(1) inside is provided with wireless communication module, and described wireless communication module includes bluetooth.
7. the real time water level supervising device for drainage system as claimed in claim 1, it is characterised in that described indication mechanism
(1) inside is additionally provided with accumulator, and described accumulator is trifluoro lithium battery.
8. the real time water level supervising device for drainage system as claimed in claim 1, it is characterised in that described indication mechanism
(1) flame retardant rating is V-0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610806250.3A CN106249743A (en) | 2016-09-05 | 2016-09-05 | A kind of real time water level supervising device for drainage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610806250.3A CN106249743A (en) | 2016-09-05 | 2016-09-05 | A kind of real time water level supervising device for drainage system |
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| Publication Number | Publication Date |
|---|---|
| CN106249743A true CN106249743A (en) | 2016-12-21 |
Family
ID=57598631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610806250.3A Pending CN106249743A (en) | 2016-09-05 | 2016-09-05 | A kind of real time water level supervising device for drainage system |
Country Status (1)
| Country | Link |
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| CN (1) | CN106249743A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106938811B (en) * | 2017-03-09 | 2018-08-24 | 惠安网信通技术开发有限公司 | A kind of elevator control system with eye mask identification function |
| CN111980043A (en) * | 2020-09-17 | 2020-11-24 | 安徽水利市政园林建设有限公司 | Automatic drainage device that takes out of tower crane foundation ditch ponding for construction |
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| CN201698478U (en) * | 2010-07-26 | 2011-01-05 | 邹庆 | Open-phase counting indicator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106938811B (en) * | 2017-03-09 | 2018-08-24 | 惠安网信通技术开发有限公司 | A kind of elevator control system with eye mask identification function |
| CN111980043A (en) * | 2020-09-17 | 2020-11-24 | 安徽水利市政园林建设有限公司 | Automatic drainage device that takes out of tower crane foundation ditch ponding for construction |
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Application publication date: 20161221 |