CN204087311U - Well lid and well lid supervisory system - Google Patents
Well lid and well lid supervisory system Download PDFInfo
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- CN204087311U CN204087311U CN201420501149.3U CN201420501149U CN204087311U CN 204087311 U CN204087311 U CN 204087311U CN 201420501149 U CN201420501149 U CN 201420501149U CN 204087311 U CN204087311 U CN 204087311U
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- well lid
- cover body
- manhole cover
- locked instrument
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Abstract
The utility model provides a kind of well lid and well lid supervisory system.This well lid comprises manhole cover body, angular transducer, locked instrument, detecting device, wireless transmitter and electric supply installation.Wherein, electric supply installation is connected with angular transducer, detecting device and wireless transmitter respectively.Angular transducer is arranged in manhole cover body, generates angle information for the angle of inclination according to manhole cover body; Locked instrument is arranged in manhole cover body, and manhole cover body is locked at well head place by locked instrument; Detecting device is arranged on locked instrument, for detecting the unlatching of locked instrument or closed condition and generating corresponding status information according to the unlatching of locked instrument or closed condition; Wireless transmitter is connected with detecting device and angular transducer respectively, for the status information received and/or angle information are sent to external electronic device, achieve the monitoring to well lid state, and then improve the accuracy of well lid condition monitoring, theftproof performance is strong, is suitable for practicality.
Description
Technical field
The utility model relates to infrastructure field, especially relates to a kind of well lid and well lid supervisory system.
Background technology
Well lid is as indispensable urban construction facility, and its substantial amounts, distribution range are extensive.Well lid is lost becomes common occurrence, and causes security incident to emerge in an endless stream because well lid is lost, and brings great potential safety hazard to vehicle and pedestrian.Therefore, effective monitoring management is implemented to well lid particularly important, particularly the power of the theftproof performance of outdoor well cover self, directly affect the effect of well lid monitoring management.
At present, the Vibration Condition of existing well lid usually just by utilizing ultrasonic sensor to monitor well lid determines the stolen state of well lid.Such as, when street is applied, vehicle can make well lid vibrate through well lid, and Vibration Condition determines according to the weight of the vehicle through well lid etc. parameter.When vehicle is through well lid, when the vibration that well lid occurs meets the Vibration Condition of stolen state, the phenomenon of the monitoring that can lead to errors occurs.So, only according to monitoring well lid Vibration Condition determine well lid whether stolen technical scheme monitoring accuracy low, very flexible, theftproof performance is weak.
Utility model content
Fundamental purpose of the present utility model is the well lid and the well lid supervisory system that provide a kind of new structure, and technical matters to be solved improves monitoring accuracy.
The purpose of this utility model and solve its technical matters and realize by the following technical solutions:
First aspect, the utility model provides a kind of well lid, and this well lid comprises:
Manhole cover body;
Angular transducer, it is arranged in described manhole cover body, generates angle information for the angle of inclination according to described manhole cover body;
Locked instrument, it is arranged in described manhole cover body, and described manhole cover body is locked at well head place by described locked instrument;
Detecting device, it is arranged on described locked instrument, for detecting the unlatching of described locked instrument or closed condition and generating corresponding status information according to the unlatching of described locked instrument or closed condition;
Wireless transmitter, it is connected with described detecting device and described angular transducer respectively, for the described status information received and/or described angle information are sent to external electronic device;
Electric supply installation, it is connected with described angular transducer, described detecting device and described wireless transmitter respectively.
Optionally, aforesaid well lid, wherein, described locked instrument comprises:
Getter;
Controller, it is connected with described getter, generates action command for the actuating signal obtained according to described getter;
Motor, it is connected with described controller, exports corresponding driving force according to described action command;
Drive unit, its power intake is connected with the described driving force output terminal of described motor;
Locking bolt, its power intake is connected with the clutch end of described drive unit.
Optionally, aforesaid well lid, wherein, described getter is: infrared signal receiver, radio-frequency card reader or magnetic card reader.
Optionally, aforesaid well lid, wherein, comprising: alarm,
Described alarm is arranged in described manhole cover body;
Described alarm is connected with described angular transducer and described detecting device respectively.
Optionally, aforesaid well lid, wherein, described locked instrument is manual and electric double opening lock.
Optionally, aforesaid well lid, wherein, described manhole cover body is provided with well lid numbering.
Second aspect, the utility model provides a kind of well lid supervisory system, and this well lid supervisory system comprises:
Central server;
Monitoring host computer, it is connected with described central server;
Well lid described above;
Wherein, the described wireless transmitter of described well lid is connected with described monitoring host computer.
Optionally, aforementioned described well lid supervisory system, wherein, described monitoring host computer comprises:
Receiver, for receiving status information and/or the angle information of the transmission of described wireless transmitter, described status information and/or angle information carry well lid numbering;
Storer, it stores the corresponding relation of well lid numbering and address information;
Processor, is connected with described receiver and described storer respectively, for the well lid numbering and the corresponding relation of address information that store according to described storer, obtains the address information that described well lid numbering is corresponding;
Transmitter, for being sent to described central server by the address information of described well lid numbering and correspondence.
Optionally, aforementioned described well lid supervisory system, wherein,
Described central server is connected with described monitoring host computer by RS485 communication line;
Described central server is connected with described monitoring host computer by CAN.
Optionally, aforementioned described well lid supervisory system, wherein, described well lid supervisory system also comprises: terminal;
Described terminal and described central server communicate to connect.
By technique scheme, the utility model structure at least has following advantages:
The technical scheme that the utility model provides, by arranging angular transducer in manhole cover body, generates angle information to make angular transducer according to the angle of inclination of manhole cover body; By arranging the detecting device for the unlatching or closed condition detecting locked instrument in manhole cover body, to make detecting device according to the corresponding status information of generation; By wireless transmitter, described status information and/or described angle information are sent to external electronic device again, achieve the monitoring to well lid state, and then improve the accuracy of well lid condition monitoring, theftproof performance is strong, is suitable for practicality.
Above-mentioned explanation is only the general introduction of technical solutions of the utility model, in order to better understand technological means of the present utility model, and can be implemented according to the content of instructions, coordinates accompanying drawing to be described in detail as follows below with preferred embodiment of the present utility model.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is further described.
The structural representation one of the well lid that Fig. 1 provides for the utility model embodiment one;
The structural representation two of the well lid that Fig. 2 provides for the utility model embodiment one;
The fundamental diagram of locked instrument in the well lid that Fig. 3 provides for the utility model embodiment one;
The structural representation of the well lid supervisory system that Fig. 4 provides for the utility model embodiment two;
The fundamental diagram of monitoring host computer in the well lid supervisory system that Fig. 5 provides for the utility model embodiment two.
Embodiment
The utility model embodiment monitors the problems such as accuracy is low, theftproof performance is weak for the existing well lid of solution and well lid supervisory system exist, propose a kind of well lid and well lid supervisory system of new structure, improve the accuracy of well lid condition monitoring, theftproof performance is strong, is suitable for practicality.
The technical scheme of the utility model embodiment is for solving the problems of the technologies described above, and general thought is as follows:
In the technical scheme that the utility model embodiment provides, described well lid comprises:
Manhole cover body;
Angular transducer, it is arranged in described manhole cover body, generates angle information for the angle of inclination according to described manhole cover body;
Locked instrument, it is arranged in described manhole cover body, and described manhole cover body is locked at well head place by described locked instrument;
Detecting device, it is arranged on described locked instrument, for detecting the unlatching of described locked instrument or closed condition and generating corresponding status information according to the unlatching of described locked instrument or closed condition;
Wireless transmitter, it is connected with described detecting device and described angular transducer respectively, for the described status information received and/or described angle information are sent to external electronic device;
Electric supply installation, it is connected with described angular transducer, described detecting device and described wireless transmitter respectively.
Conceive based on same utility model, the utility model provides a kind of well lid supervisory system, and described well lid supervisory system comprises:
Central server;
Monitoring host computer, it is connected with described central server;
Well lid, it comprises:
Manhole cover body;
Angular transducer, it is arranged in described manhole cover body, generates angle information for the angle of inclination according to described manhole cover body;
Locked instrument, it is arranged in described manhole cover body, and described manhole cover body is locked at well head place by described locked instrument;
Detecting device, it is arranged on described locked instrument, for detecting the unlatching of described locked instrument or closed condition and generating corresponding status information according to the unlatching of described locked instrument or closed condition;
Wireless transmitter, it is connected with described detecting device and described angular transducer respectively, for the described status information received and/or described angle information are sent to external electronic device;
Electric supply installation, it is connected with described angular transducer, described detecting device and described wireless transmitter respectively;
Wherein, the described wireless transmitter of described well lid is connected with described monitoring host computer.
The technical scheme that the utility model provides, by arranging angular transducer in manhole cover body, generates angle information to make angular transducer according to the angle of inclination of manhole cover body; By arranging the detecting device for the unlatching or closed condition detecting locked instrument in manhole cover body, to make detecting device according to the corresponding status information of generation; By wireless transmitter, described status information and/or described angle information are sent to external electronic device again, achieve the monitoring to well lid state, and then improve the accuracy of well lid condition monitoring, theftproof performance is strong, is suitable for practicality.
For further setting forth the utility model for the technological means reaching predetermined utility model object and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to according to its embodiment of testing table, structure, feature and the effect thereof that the utility model proposes, be described in detail as follows.In the following description, the not necessarily same embodiment that different " embodiment " or " embodiment " refers to.In addition, special characteristic, structure or feature in one or more embodiment can be combined by any suitable form.
Embodiment one
The structural representation of the well lid that Fig. 1 provides for the utility model embodiment one.As shown in Figure 1, the well lid described in the present embodiment comprises: manhole cover body 10, angular transducer 20, locked instrument 30, detecting device 40, wireless transmitter 50 and electric supply installation 60.Wherein, described angular transducer 20 is arranged in described manhole cover body 10, generates angle information for the angle of inclination according to described manhole cover body 10.Described locked instrument 30 is arranged in described manhole cover body 10, and described manhole cover body 10 is locked at well head place by described locked instrument 30.In the present embodiment, when described manhole cover body 10 is locked together with well head by described locked instrument 30, described locked instrument 30 is in opening; When described manhole cover body 10 is separated with well head place, described locked instrument 30 is in closed condition.Described detecting device 40 is arranged on described locked instrument 30, for detecting the unlatching of described locked instrument 30 or closed condition and generating corresponding status information according to the unlatching of described locked instrument 30 or closed condition.Described wireless transmitter 50 is connected with described detecting device 40 and described angular transducer 20 respectively, and the described status information received can be sent to external electronic device by described wireless transmitter 50; Or the described angle information received can be sent to external electronic device by described wireless transmitter 50; Or the described status information received and described angle information can be sent to external electronic device by described wireless transmitter 50.Described electric supply installation 60 is connected with described angular transducer 20, described detecting device 40 and described wireless transmitter 50 respectively, to power to described angular transducer 20, described detecting device 40 and described wireless transmitter 50.
The technical scheme that the utility model provides, by arranging angular transducer in manhole cover body, generates angle information to make angular transducer according to the angle of inclination of manhole cover body; By arranging the detecting device for the unlatching or closed condition detecting locked instrument in manhole cover body, to make detecting device according to the corresponding status information of generation; By wireless transmitter, described status information and/or described angle information are sent to external electronic device again, achieve the monitoring to well lid state, and then improve the accuracy of well lid condition monitoring, theftproof performance is strong, is suitable for practicality.
Further, as shown in Figure 3, the locked instrument 30 described in above-described embodiment comprises: getter 31, controller 32, motor 33, drive unit 34 and locking bolt 35.Wherein, described controller 32 is connected with described getter 31, generates action command for the actuating signal obtained according to described getter 31.Described motor 33 is connected with described controller 32, exports corresponding driving force according to described action command.The power intake of described drive unit 34 is connected with the described driving force output terminal of described motor 33.The power intake of described locking bolt 35 is connected with the clutch end of described drive unit 34, makes described drive unit 34 drive described locking bolt 35 to move, thus makes described locked instrument 30 be in opening or closed condition.
Particularly, the getter 31 described in above-described embodiment can comprise following several situation:
The first, described getter 31 is infrared signal receiver, described locked instrument 30 comprises the wireless receiving and dispatching key mated with described infrared signal receiver, staff is by the described wireless receiving and dispatching key of operation, to make described wireless receiving and dispatching key and described infrared signal receiver cooperating, thus can realize the described unlatching of locked instrument 30 or the control of closed condition, and then meet staff can the demand of far distance controlled locked instrument 30, succinctly facilitate.
The second, described getter 31 is radio-frequency card reader, by the IC-card mated with described radio-frequency card reader is attached described radio-frequency card reader, to realize the described unlatching of locked instrument 30 or the control of closed condition.
The third, described getter 31 is magnetic card reader, described manhole cover body is provided with the through hole corresponding with the magnetic card insertion end of described magnetic card reader, the magnetic card mated with described magnetic card reader is inserted in described magnetic card insertion end by described through hole, to realize the described unlatching of locked instrument 30 or the control of closed condition.
Further, as shown in Figure 1, the well lid described in above-described embodiment can also comprise: alarm 70.Described alarm 70 is arranged in described manhole cover body 10.Described alarm 70 is connected with described angular transducer 20 and described detecting device 40 respectively.In actual applications, alarm 70 can adopt luminous alarm lamp or alarming horn.
Further, as shown in Figure 2, in order to avoid when the system of well lid or well lid place is in power down mode, the unlatching of uncontrollable described locked instrument 30 or the phenomenon of closed condition occur.Locked instrument 30 described in above-described embodiment can be existing manual and electric double opening lock.Existing manually and electric double opening lock have manually with electronic two kinds of modes of unblanking.When manually and electric double opening lock is in the state of power-off time, can manually the mode of unblanking be opened by manual and electric double opening lock.Wherein, described quantity that is manual and electric double opening lock 35 is two or more.During specific works, when use two described manually and electric double opening lock 35 time, need to use two keys matched with described manual and electric double opening lock 35 simultaneously, unlatching or the closed condition of locked instrument 30 described in Non-follow control could be realized, improve the security of locked instrument, be suitable for using.
Further, when monitoring multiple well lid, for the ease of distinguishing the state of each well lid, the described manhole cover body described in above-described embodiment is provided with well lid numbering.Staff carries out optimum configurations according to the well lid numbering in described manhole cover body to described wireless transmitter, after the status information received to make described wireless transmitter and/or angle information, again described status information and/or angle information are sent to the well lid number information of carrying upper correspondence during external electronic device, to facilitate the monitor and managment of the state to each well lid.
Embodiment two
The structural representation of the well lid supervisory system that Fig. 4 provides for the utility model two embodiment.As shown in Figure 4, this well lid supervisory system comprises: central server 300, monitoring host computer 200 and well lid 100.Wherein, as shown in Figure 1, described well lid 100 comprises: manhole cover body 10, angular transducer 20, locked instrument 30, detecting device 40, wireless transmitter 50 and electric supply installation 60.Wherein, described angular transducer 20 is arranged in described manhole cover body 10, generates angle information for the angle of inclination according to described manhole cover body 10.Described locked instrument 30 is arranged in described manhole cover body 10, and described manhole cover body 10 is locked at well head place by described locked instrument 30.Described detecting device 40 is arranged on described locked instrument 30, for detecting the unlatching of described locked instrument 30 or closed condition and generating corresponding status information according to the unlatching of described locked instrument 30 or closed condition.Described wireless transmitter 50 is connected with described detecting device 40 and described angular transducer 20 respectively, for the described status information received and/or described angle information are sent to external electronic device.Described electric supply installation 60 is connected with described angular transducer 20, described detecting device 40 and described wireless transmitter 50 respectively.As shown in Figure 4, the described wireless transmitter 50 of described well lid 100 is connected with described monitoring host computer 200, and described monitoring host computer 200 is connected with described central server 300.
Particularly, the described well lid 100 that the well lid 100 described in the present embodiment two can directly adopt above-described embodiment one to provide, the concrete structure that realizes see the related content described in above-described embodiment one, can repeat no more herein.
Particularly, as shown in Figure 5, the monitoring host computer 200 described in above-described embodiment comprises: receiver 210, storer 220, processor 230 and transmitter 240.Described receiver 210 receives status information and/or the angle information of the transmission of described wireless transmitter 50, and described status information and/or angle information carry well lid numbering; Described storer 220 stores the corresponding relation of well lid numbering and address information.Described processor 230 is connected with described receiver 210 and described storer 220 respectively, for the well lid numbering and the corresponding relation of address information that store according to described storer 220, obtains the address information that described well lid numbering is corresponding.The address information of described well lid numbering and correspondence is sent to described central server 300 by described transmitter 240, thus realizes the monitoring to well lid 100 state.
Further, described central server 300 can be connected with described monitoring host computer 200 by RS485 communication line; Or described central server 300 can be connected with described monitoring host computer 200 by CAN, to make can carry out Long-distance Control between central server 300 and monitoring host computer 200, to reach the object of remote monitoring well lid 100 state.
Further, the well lid supervisory system described in above-described embodiment also comprises: terminal.Described terminal and described central server 300 communicate to connect.After described central server 300 receives the described well lid numbering of described transmitter 240 transmission and the address information of correspondence, show the address information of described well lid numbering and correspondence, the address information of described well lid numbering and correspondence is sent to terminal, to notify the state of staff's well lid 100 simultaneously.
The specific works process of the well lid supervisory system in above-described embodiment is: the controller 32 of monitoring host computer 200 regularly sends monitor message to the wireless transmitter 50 of well lid 100, after wireless transmitter 50 receives monitor message, the angle information received from angular transducer 20 and detecting device 40 and/or status information are sent to monitoring host computer 200, thus realize the object of monitoring host computer 200 pairs of well lids 100 monitoring in real time.When well lid 100 run-off the straight and when producing certain angle of inclination, the angular transducer 20 on well lid 100 generates angle information according to angle of inclination; And/or when the locked instrument 30 of well lid 100 is in closed condition, the detecting device 40 of well lid 100 generates closed condition information according to the closed condition of locked instrument 30.Closed condition information is sent to monitoring host computer 200 by the wireless transmitter 50 of well lid 100, monitoring host computer 200 sends alerting signal, and by with carry status information that well lid numbers and/or address information corresponding to angle information is sent to central server 300, central server 300 shows address information and address information is sent to terminal, to notify that staff realizes warning reminding.
Here it should be noted that, the terminal described in above-described embodiment can be mobile phone or panel computer.
The technical scheme that the utility model provides, by arranging angular transducer in manhole cover body, generates angle information to make angular transducer according to the angle of inclination of manhole cover body; By arranging the detecting device for the unlatching or closed condition detecting locked instrument in manhole cover body, to make detecting device according to the corresponding status information of generation; By wireless transmitter, described status information and/or described angle information are sent to external electronic device again, achieve the monitoring to well lid state, and then improve the accuracy of well lid condition monitoring, theftproof performance is strong, is suitable for practicality.
Last it is noted that above embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (10)
1. a well lid, is characterized in that, comprising:
Manhole cover body;
Angular transducer, it is arranged in described manhole cover body, generates angle information for the angle of inclination according to described manhole cover body;
Locked instrument, it is arranged in described manhole cover body, and described manhole cover body is locked at well head place by described locked instrument;
Detecting device, it is arranged on described locked instrument, for detecting the unlatching of described locked instrument or closed condition and generating corresponding status information according to the unlatching of described locked instrument or closed condition;
Wireless transmitter, it is connected with described detecting device and described angular transducer respectively, for the described status information received and/or described angle information are sent to external electronic device;
Electric supply installation, it is connected with described angular transducer, described detecting device and described wireless transmitter respectively.
2. well lid according to claim 1, is characterized in that, described locked instrument comprises:
Getter;
Controller, it is connected with described getter, generates action command for the actuating signal obtained according to described getter;
Motor, it is connected with described controller, exports corresponding driving force according to described action command;
Drive unit, its power intake is connected with the described driving force output terminal of described motor;
Locking bolt, its power intake is connected with the clutch end of described drive unit.
3. well lid according to claim 2, is characterized in that, described getter is: infrared signal receiver, radio-frequency card reader or magnetic card reader.
4. well lid according to claim 1, is characterized in that, comprising: alarm,
Described alarm is arranged in described manhole cover body;
Described alarm is connected with described angular transducer and described detecting device respectively.
5. well lid according to claim 1, is characterized in that, described locked instrument is manual and electric double opening lock.
6. well lid according to any one of claim 1 to 5, is characterized in that, described manhole cover body is provided with well lid numbering.
7. a well lid supervisory system, is characterized in that, comprising:
Central server;
Monitoring host computer, it is connected with described central server;
Well lid described in the claims 1 ~ 6;
Wherein, the described wireless transmitter of described well lid is connected with described monitoring host computer.
8. well lid supervisory system according to claim 7, is characterized in that, described monitoring host computer comprises:
Receiver, for receiving status information and/or the angle information of the transmission of described wireless transmitter, described status information and/or angle information carry well lid numbering;
Storer, it stores the corresponding relation of well lid numbering and address information;
Processor, is connected with described receiver and described storer respectively, for the well lid numbering and the corresponding relation of address information that store according to described storer, obtains the address information that described well lid numbering is corresponding;
Transmitter, for being sent to described central server by the address information of described well lid numbering and correspondence.
9. well lid supervisory system according to claim 7, is characterized in that,
Described central server is connected with described monitoring host computer by RS485 communication line;
Described central server is connected with described monitoring host computer by CAN.
10. well lid supervisory system according to claim 7, is characterized in that, also comprise: terminal;
Described terminal and described central server communicate to connect.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420501149.3U CN204087311U (en) | 2014-09-01 | 2014-09-01 | Well lid and well lid supervisory system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420501149.3U CN204087311U (en) | 2014-09-01 | 2014-09-01 | Well lid and well lid supervisory system |
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| CN204087311U true CN204087311U (en) | 2015-01-07 |
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| CN201420501149.3U Active CN204087311U (en) | 2014-09-01 | 2014-09-01 | Well lid and well lid supervisory system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104240343A (en) * | 2014-09-01 | 2014-12-24 | 北京泛亚电通工贸有限责任公司 | Well cover as well as monitoring method and monitoring system thereof |
| CN105464143A (en) * | 2015-12-24 | 2016-04-06 | 上海华魏光纤传感技术有限公司 | Tamper alarm control system of intelligent well cover |
| CN106948379A (en) * | 2017-04-26 | 2017-07-14 | 嘉兴恒力建材科技有限公司 | A kind of well lid intelligent anti-theft device |
| CN107885153A (en) * | 2017-12-22 | 2018-04-06 | 北京师范大学 | A kind of sewer refuse collection intelligent monitoring and controlling device |
| CN108071125A (en) * | 2018-02-01 | 2018-05-25 | 国网上海市电力公司 | A kind of intelligent wireless manhole lid device |
| CN110195417A (en) * | 2019-06-24 | 2019-09-03 | 安徽辰控智能科技有限公司 | A kind of subway electronics boundary marker |
-
2014
- 2014-09-01 CN CN201420501149.3U patent/CN204087311U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104240343A (en) * | 2014-09-01 | 2014-12-24 | 北京泛亚电通工贸有限责任公司 | Well cover as well as monitoring method and monitoring system thereof |
| CN105464143A (en) * | 2015-12-24 | 2016-04-06 | 上海华魏光纤传感技术有限公司 | Tamper alarm control system of intelligent well cover |
| CN106948379A (en) * | 2017-04-26 | 2017-07-14 | 嘉兴恒力建材科技有限公司 | A kind of well lid intelligent anti-theft device |
| CN107885153A (en) * | 2017-12-22 | 2018-04-06 | 北京师范大学 | A kind of sewer refuse collection intelligent monitoring and controlling device |
| CN108071125A (en) * | 2018-02-01 | 2018-05-25 | 国网上海市电力公司 | A kind of intelligent wireless manhole lid device |
| CN110195417A (en) * | 2019-06-24 | 2019-09-03 | 安徽辰控智能科技有限公司 | A kind of subway electronics boundary marker |
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