CN104467957A - Monitoring device beneficial to optical cable line maintenance - Google Patents

Monitoring device beneficial to optical cable line maintenance Download PDF

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Publication number
CN104467957A
CN104467957A CN201410734215.6A CN201410734215A CN104467957A CN 104467957 A CN104467957 A CN 104467957A CN 201410734215 A CN201410734215 A CN 201410734215A CN 104467957 A CN104467957 A CN 104467957A
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CN
China
Prior art keywords
framework
interface
convenient
monitoring device
fiber optic
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Granted
Application number
CN201410734215.6A
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Chinese (zh)
Other versions
CN104467957B (en
Inventor
吕齐
朱晓光
王申华
方小方
曹保良
何瑞兵
陈尔东
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Jinhua Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Wuyi Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Jinhua Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Wuyi Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by State Grid Corp of China SGCC, Jinhua Power Supply Co of State Grid Zhejiang Electric Power Co Ltd, Wuyi Power Supply Co of State Grid Zhejiang Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201410734215.6A priority Critical patent/CN104467957B/en
Publication of CN104467957A publication Critical patent/CN104467957A/en
Application granted granted Critical
Publication of CN104467957B publication Critical patent/CN104467957B/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

The invention relates to a monitoring device beneficial to optical cable line maintenance. The monitoring device comprises a frame body, a control unit and a power supply assembly. The power supply assembly is connected with the control unit. At least two optical time domain reflectometers are connected to the control unit. The power supply assembly comprises a solar cell panel assembly and electric energy collectors, wherein each electric energy collector is provided with a first interface and a second interface, and an alarm assembly is arranged on each electric energy collector. The monitoring device has the advantages that the electric energy generated by the solar cell panel assembly is collected through the electric energy collectors, power is supplied to the control unit through the first interfaces, power is supplied to the optical time domain reflectometers through the second interfaces, the connectivity power supply of the control unit and the optical time domain reflectometers is ensured, the work intensity caused by the existing power supply assembly replacement is lowered, it is ensured that the optical time domain reflectometers can normally work when voltages of power supplies arranged in the optical time domain reflectometers are low, the simultaneous access of the first interfaces and the second interfaces is avoided through the alarm assemblies, and the voltage supply stability is ensured.

Description

A kind of monitoring device being convenient to fiber optic cable maintenance
Technical field
The present invention relates to a kind of monitoring device being convenient to fiber optic cable maintenance.
Background technology
Power telecom network, as the support of the electrical network production and operation, is the important component part of network system.Power telecom network is not only the basis of the electrical network production automation and marketing management modernization, and provides safeguard for power grid security, stable and economical operation.Along with the continuous reinforcement of State Grid Corporation of China's informatization is with deep, the optical fiber information transmission system becomes basically universal, along with the sharply increase of newly-increased optical cable quantity and the progressively aging of early stage laying optical cable, the number of stoppages of lightguide cable link is in remarkable increase, the maintenance workload of lightguide cable link is caused to increase, owing to adopting traditional manual maintenance way to manage, to the malfunction monitoring of lightguide cable link and service work not in time, the annual loss caused because of communications optical cable line fault is huge, China's application number is that CN201220304203.6 discloses a kind of fiber optic cable monitor device, disclose the monitoring realized optical cable, specifically comprise framework, be built in the control unit in framework, power supply module, optical time domain reflectometer, optical time domain reflectometer is that built-in power supply module is powered to it, there is the defect that low pressure needs to change in power supply module, need during existing replacing to carry out installing/dismounting to framework, there is working strength large, misoperation, easily infringement is produced to equipment, reduce useful life, poor stability, continuous power supply can not be ensured.
Summary of the invention
The technical problem to be solved in the present invention is just to provide a kind of monitoring device being convenient to fiber optic cable maintenance, can not powering continuously of the interior existence of existing fiber optic cable monitor device can well be solved, when power supply module is changed, working strength is large, and installing/dismounting bothers, and result of use is poor.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions: a kind of monitoring device being convenient to fiber optic cable maintenance, comprise framework, be built in the control unit in framework, power supply module, described power supply module is connected with control unit, described control unit is connected with at least two optical time domain reflectometers, described power supply module comprises the solar panels assembly be arranged in framework, at least one power collector be connected with solar panels assembly, each power collector is equipped with at least one first interface be connected with control unit and the second interface that at least one is connected with optical time domain reflectometer, described power collector is provided with an alarm assemblies avoiding first interface and the second interface simultaneously to access, the mounting panel installed for power collector is provided with in described framework, the bottom of described mounting panel is provided with some heat sink strips, described optical time domain reflectometer is provided with the connector matched with the second interface.
Preferably, described solar panels assembly comprises the first baffle plate, second baffle, at least one piece of solar panels be arranged between the first baffle plate and second baffle, the guide rail for the first baffle plate and second baffle activity is provided with in described framework, described framework is provided with the through hole that is convenient to the activity of solar panels assembly, structure is simple, and be convenient to the placement of solar panels assembly, slide is effective, stationary performance time movable is good, decreases the damage of solar panels.
Preferably, described guide rail horizontal direction is arranged in framework, the length of described guide rail is greater than the length of solar panels assembly, one piece of cover plate sealed by through hole is provided with between described first baffle plate and second baffle, at least one card key on the madial wall of described cover plate, described guide rail is provided with the fixing hole matched with card key, the lateral wall of described cover plate is provided with the handle controlling cover plate activity, avoiding dust splashes on solar panels, ensure that the normal work of solar panels, decrease the working strength of cleaning, coordinated with guide rail by card key, ensure that the sealing property of cover plate, result of use is good.
Preferably, described guide rail vertical direction is arranged on the lateral wall of framework, and the outermost of described guide rail is also provided with one piece of sealing plate be fixed by screws on guide rail, structure is simple, sealing plate setting, decrease the damage of solar panels, result of use is good, and screw is fixedly connected with reliably.
Preferably, described framework is rotatably connected to a supporting component, described supporting component comprises at least one and is connected to framework upper support bar by axis of rotation, the supporting bracket on support bar is rotatably connected on by bolt assembly, the top of described supporting bracket is provided with security bar, the bottom of described supporting bracket is provided with the mount pad be convenient to support bar and installed, avoid the stationarity during work of solar panels assembly, decrease the damage of solar panels, reduce use cost, safe and reliable, structure is simple, avoid supporting bracket by security bar to damage solar panels, the solar absorption of different angles can be adapted to by the supporting bracket of rotating support bar and the rotation arranged, Practical Performance is good.
Preferably, the alarm that described alarm assemblies comprises control chip, is connected with control chip, described control chip is provided with the indicator light of display first interface and the second interfaces, controlled by control chip, highly sensitive, warning effect is good, by the setting of indicator light, and convenient operation personal observations.
Preferably, described first interface and the second interface are USB interface or cannon plug, and described first interface and the second interface are provided with Label, and connect reliable, easy installation and removal, by the setting of Label, avoids the impact that connection error is brought.
Preferably, described mounting panel is provided with the standing groove that several are convenient to power collector placement, be provided with at least one in described standing groove and power collector be fixed on magnet in standing groove, the bottom of described power collector is provided with the adhesive plate matched with magnet, avoid the slip of power collector in moving process, locking effect is good, and structure is simple.
Preferably, described heat sink strip is bar shaped, described framework is provided with several louvres, described louvre is downward-sloping is from the inside to the outside arranged in framework, bar shaped good heat dissipation effect, and by louvre, the heat in framework is dispelled the heat, improve useful life, decrease power collector at high operating temperatures on the impact of equipment, security performance is higher.
Preferably, the bottom of described framework is provided with shifting roller, the bottom of described framework is provided with one piece of control board controlling shifting roller locking or slide, described control board is movably connected in framework by push rod, described control board is provided with electromagnet, described shifting roller is provided with the brace matched with electromagnet, be convenient to the movement of framework, brace on the electromagnetic actuation shifting roller be provided with by control board, achieve operating state or laying state lower frame body does not slide, thus improve security performance, decrease damage, and locking or the disconnection of control board and brace is controlled by push rod, structure is simple, control highly sensitive.
In sum, advantage of the present invention: the electric energy that solar panels assembly produces is collected by power collector, and by first interface, control unit is powered, second interface is powered to optical time domain reflectometer, ensure that and the connectivity of control unit and optical time domain reflectometer is powered, decrease the existing working strength that the replacing of power supply module is brought, damage to element when decreasing replacing, improve useful life, ensure that optical time domain reflectometer can normally work when optical time domain reflectometer built-in power low-voltage, avoid first interface and the second interface to access by alarm assemblies simultaneously, ensure that the stability that voltage supplies, make control unit and optical time domain reflectometer steady operation, result of use is good, by heat sink strip, the power collector on mounting panel is dispelled the heat, the temperature effectively avoided in framework does not affect work.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is the structural representation of the embodiment of the present invention one;
Fig. 2 is the structural representation of power supply module of the present invention;
Fig. 3 is the structural representation of supporting component of the present invention;
Fig. 4 is the structural representation that power collector of the present invention is installed;
Fig. 5 is the structural representation that embodiment two middle guide is installed.
Embodiment
Embodiment one:
As Fig. 1, Fig. 2, Fig. 3, shown in Fig. 4, a kind of monitoring device being convenient to fiber optic cable maintenance, comprise framework 1, be built in the control unit 3 in framework 1, power supply module 2, described power supply module 2 is connected with control unit 3, described control unit 3 is connected with at least two optical time domain reflectometers 4, described power supply module 2 comprises the solar panels assembly 20 be arranged in framework 1, at least one power collector 21 be connected with solar panels assembly 20, each power collector 21 is equipped with at least one first interface 22 be connected with control unit 3 and the second interface 23 that at least one is connected with optical time domain reflectometer 4, described power collector 21 is provided with an alarm assemblies 24 avoiding first interface 22 and the second interface 23 simultaneously to access, the mounting panel 10 installed for power collector 21 is provided with in described framework 1, the bottom of described mounting panel 10 is provided with some heat sink strips 107, described optical time domain reflectometer 4 is provided with the connector 41 matched with the second interface 23, described solar panels assembly 20 comprises the first baffle plate 200, second baffle 201, at least one piece of solar panels 202 be arranged between the first baffle plate 200 and second baffle 201, the guide rail 11 for the first baffle plate 200 and second baffle 201 activity is provided with in described framework 1, described framework 1 is provided with the through hole 12 that is convenient to solar panels assembly 20 activity, structure is simple, be convenient to the placement of solar panels assembly, slide is effective, stationary performance time movable is good, decrease the damage of solar panels, described guide rail 11 horizontal direction is arranged in framework 1, the length of described guide rail 11 is greater than the length of solar panels assembly 20, one piece of cover plate 203 sealed by through hole 12 is provided with between described first baffle plate 200 and second baffle 201, at least one card key 204 on the madial wall of described cover plate 203, described guide rail is provided with the fixing hole matched with card key, the lateral wall of described cover plate 203 is provided with the handle 205 controlling cover plate 203 activity, avoiding dust splashes on solar panels, ensure that the normal work of solar panels, decrease the working strength of cleaning, coordinated with guide rail by card key, ensure that the sealing property of cover plate, result of use is good, described framework 1 is rotatably connected to a supporting component 5, described supporting component 5 comprises at least one and is rotatably connected on framework 1 upper support bar 52 by rotating shaft 51, the supporting bracket 54 on support bar 52 is rotatably connected on by bolt assembly 53, the top of described supporting bracket 54 is provided with security bar 55, the bottom of described supporting bracket 54 is provided with the mount pad 56 be convenient to support bar 52 and installed, avoid the stationarity during work of solar panels assembly, decrease the damage of solar panels, reduce use cost, safe and reliable, structure is simple, avoid supporting bracket by security bar to damage solar panels, the solar absorption of different angles can be adapted to by the supporting bracket of rotating support bar and the rotation arranged, Practical Performance is good, described alarm assemblies 24 comprises control chip 241, the alarm 242 be connected with control chip 241, described control chip 241 is provided with the indicator light 243 of display first interface 22 and the work of the second interface 23, controlled by control chip, highly sensitive, warning effect is good, by the setting of indicator light, convenient operation personal observations, described first interface 22 and the second interface 23 are USB interface or cannon plug, described first interface 22 and the second interface 23 are provided with Label, connect reliable, easy installation and removal, by the setting of Label, avoid the impact that connection error is brought, described mounting panel 10 is provided with the standing groove 100 that several are convenient to power collector 21 placement, be provided with at least one in described standing groove 100 and power collector 21 be fixed on magnet 101 in standing groove 100, the bottom of described power collector 21 is provided with the adhesive plate 210 matched with magnet 101, avoid the slip of power collector in moving process, locking effect is good, structure is simple, described heat sink strip 107 is bar shaped, described framework 1 is provided with several louvres 14, described louvre 14 is downward-sloping is from the inside to the outside arranged in framework 1, bar shaped good heat dissipation effect, and by louvre, the heat in framework is dispelled the heat, improve useful life, decrease power collector at high operating temperatures on the impact of equipment, security performance is higher, the bottom of described framework 1 is provided with shifting roller 6, the bottom of described framework 1 is provided with one piece of control board 7 controlling shifting roller 6 and lock or slide, described control board 7 is movably connected in framework 1 by push rod 8, described control board 7 is provided with electromagnet 71, described shifting roller 6 is provided with the brace 61 matched with electromagnet 71, be convenient to the movement of framework, brace on the electromagnetic actuation shifting roller be provided with by control board, achieve operating state or laying state lower frame body does not slide, thus improve security performance, decrease damage, and locking or the disconnection of control board and brace is controlled by push rod, structure is simple, control highly sensitive.
Embodiment two:
A kind of monitoring device being convenient to fiber optic cable maintenance as described in embodiment one, the present embodiment has following difference: as shown in Figure 5, described guide rail 11 vertical direction is arranged on the lateral wall of framework 1, the outermost of described guide rail 11 is also provided with one piece of sealing plate 13 be fixed on by screw 15 on guide rail 11, the outermost of described guide rail is also provided with one piece of sealing plate be fixed by screws on guide rail, structure is simple, sealing plate setting, decrease the damage of solar panels, result of use is good, and screw is fixedly connected with reliably.
During use, pull solar panels assembly 20 activity in guide rail 11 by handle 205, and pass through the position of 5 control solar panels assemblies 20 between support, to adapt to the reception of different phase to sunlight, and carry out collection electric energy by power collector 21, control unit 3 is connected with the first interface 22 on power collector 21, connector 41 on optical time domain reflectometer 4 is connected with the second interface 23 on power collector 21, when solar panels assembly 20 is collected, discharge in framework 1 by louvre 14 after the heat that power collector 21 produces is distributed by heat sink strip 107, when first interface 22 and the second interface 23 access simultaneously, alarm assemblies 24 is reported to the police, operating personnel are reminded to change, framework 1 is moved to different occasions and monitors by the shifting roller 6 that can be provided with by framework 1, and the movement of shifting roller 6 is controlled by control board 8.
By power collector, the electric energy that solar panels assembly produces is collected, and by first interface, control unit is powered, second interface is powered to optical time domain reflectometer, ensure that and the connectivity of control unit and optical time domain reflectometer is powered, decrease the existing working strength that the replacing of power supply module is brought, damage to element when decreasing replacing, improve useful life, ensure that optical time domain reflectometer can normally work when optical time domain reflectometer built-in power low-voltage, avoid first interface and the second interface to access by alarm assemblies simultaneously, ensure that the stability that voltage supplies, make control unit and optical time domain reflectometer steady operation, result of use is good, by heat sink strip, the power collector on mounting panel is dispelled the heat, the temperature effectively avoided in framework does not affect work.

Claims (10)

1. be convenient to the monitoring device of fiber optic cable maintenance for one kind, comprise framework (1), be built in the control unit (3) in framework (1), power supply module (2), described power supply module (2) is connected with control unit (3), it is characterized in that: described control unit (3) is connected with at least two optical time domain reflectometers (4), described power supply module (2) comprises the solar panels assembly (20) be arranged in framework (1), at least one power collector (21) be connected with solar panels assembly (20), each power collector (21) is equipped with at least one first interface (22) be connected with control unit (3) and the second interface (23) that at least one is connected with optical time domain reflectometer (4), described power collector (21) is provided with an alarm assemblies (24) avoiding first interface (22) and the second interface (23) simultaneously to access, the mounting panel (10) installed for power collector (21) is provided with in described framework (1), the bottom of described mounting panel (10) is provided with some heat sink strips (107), described optical time domain reflectometer (4) is provided with the connector (41) matched with the second interface (23).
2. a kind of monitoring device being convenient to fiber optic cable maintenance according to claim 1, it is characterized in that: described solar panels assembly (20) comprises the first baffle plate (200), second baffle (201), at least one piece of solar panels (202) be arranged between the first baffle plate (200) and second baffle (201), the guide rail (11) for the first baffle plate (200) and second baffle (201) activity is provided with in described framework (1), described framework (1) is provided with one and is convenient to the movable through hole (12) of solar panels assembly (20).
3. a kind of monitoring device being convenient to fiber optic cable maintenance according to claim 2, it is characterized in that: described guide rail (11) horizontal direction is arranged in framework (1), the length of described guide rail (11) is greater than the length of solar panels assembly (20), one piece of cover plate (203) sealed by through hole (12) is provided with between described first baffle plate (200) and second baffle (201), at least one card key (204) on the madial wall of described cover plate (203), described guide rail (11) is provided with the fixing hole matched with card key, the lateral wall of described cover plate (203) is provided with and controls the movable handle (205) of cover plate (203).
4. a kind of monitoring device being convenient to fiber optic cable maintenance according to claim 2, it is characterized in that: described guide rail (11) vertical direction is arranged on the lateral wall of framework (1), the outermost of described guide rail (11) is also provided with one piece of sealing plate (13) be fixed on by screw (15) on guide rail (11).
5. a kind of monitoring device being convenient to fiber optic cable maintenance according to claim 2, it is characterized in that: described framework (1) is rotatably connected to a supporting component (5), described supporting component (5) comprises at least one and is rotatably connected on framework (1) upper support bar (52) by rotating shaft (51), the supporting bracket (54) on support bar (52) is rotatably connected on by bolt assembly (53), the top of described supporting bracket (54) is provided with security bar (55), the bottom of described supporting bracket (54) is provided with the mount pad (56) be convenient to support bar (52) and installed.
6. a kind of monitoring device being convenient to fiber optic cable maintenance according to claim 1, it is characterized in that: the alarm (242) that described alarm assemblies (24) comprises control chip (241), is connected with control chip (241), described control chip (241) is provided with display first interface (22) and the indicator light (243) that works of the second interface (23).
7. a kind of monitoring device being convenient to fiber optic cable maintenance according to claim 5, it is characterized in that: described first interface (22) and the second interface (23) are USB interface or cannon plug, described first interface (22) and the second interface (23) are provided with Label.
8. a kind of monitoring device being convenient to fiber optic cable maintenance according to claim 1, it is characterized in that: described mounting panel (10) is provided with several and is convenient to the standing groove (100) that power collector (21) places, be provided with at least one in described standing groove (100) and power collector (21) be fixed on magnet (101) in standing groove (100), the bottom of described power collector (21) is provided with the adhesive plate (210) matched with magnet (101).
9. a kind of monitoring device being convenient to fiber optic cable maintenance according to claim 1, it is characterized in that: described heat sink strip (107) is bar shaped, described framework (1) is provided with several louvres (14), and described louvre (14) is downward-sloping is from the inside to the outside arranged in framework (1).
10. a kind of monitoring device being convenient to fiber optic cable maintenance according to claim 1, it is characterized in that: the bottom of described framework (1) is provided with shifting roller (6), the bottom of described framework (1) is provided with one piece of control board (7) controlling shifting roller (6) locking or slide, described control board (7) is movably connected in framework (1) by push rod (8), described control board (7) is provided with electromagnet (71), and described shifting roller (6) is provided with the brace (61) matched with electromagnet (71).
CN201410734215.6A 2014-12-04 2014-12-04 Monitoring device beneficial to optical cable line maintenance Active CN104467957B (en)

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CN104467957B CN104467957B (en) 2017-05-17

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108198444A (en) * 2017-12-22 2018-06-22 黄佳立 A kind of lifting signal lamp with locking function
CN110474677A (en) * 2019-08-16 2019-11-19 王新凤 A kind of method of quick positioning breakpoints of optical fiber
CN112187348A (en) * 2020-10-15 2021-01-05 郭天强 Portable carrying box for optical time domain reflectometer
CN112968526A (en) * 2021-03-17 2021-06-15 杭州惠嘉信息科技有限公司 Microclimate online monitoring device for high-voltage transmission line

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US20080086278A1 (en) * 2005-11-04 2008-04-10 Anritsu Corporation Optical Time Domain Reflectometer, And Optical Fiber Measuring Method And Optical Fiber Measuring System ...
CN202750092U (en) * 2012-06-26 2013-02-20 上海致达智利达系统控制有限责任公司 Integrated optical cable monitoring device
CN203747825U (en) * 2014-03-06 2014-07-30 青岛海信宽带多媒体技术有限公司 ONU optical module with optical fiber fault detection function
CN203933632U (en) * 2014-07-04 2014-11-05 国家电网公司 A kind of movable optical signal detecting warning device that is applicable to OTDR
CN204216899U (en) * 2014-12-04 2015-03-18 国家电网公司 A kind of monitoring device being convenient to fiber optic cable maintenance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080086278A1 (en) * 2005-11-04 2008-04-10 Anritsu Corporation Optical Time Domain Reflectometer, And Optical Fiber Measuring Method And Optical Fiber Measuring System ...
CN202750092U (en) * 2012-06-26 2013-02-20 上海致达智利达系统控制有限责任公司 Integrated optical cable monitoring device
CN203747825U (en) * 2014-03-06 2014-07-30 青岛海信宽带多媒体技术有限公司 ONU optical module with optical fiber fault detection function
CN203933632U (en) * 2014-07-04 2014-11-05 国家电网公司 A kind of movable optical signal detecting warning device that is applicable to OTDR
CN204216899U (en) * 2014-12-04 2015-03-18 国家电网公司 A kind of monitoring device being convenient to fiber optic cable maintenance

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108198444A (en) * 2017-12-22 2018-06-22 黄佳立 A kind of lifting signal lamp with locking function
CN110474677A (en) * 2019-08-16 2019-11-19 王新凤 A kind of method of quick positioning breakpoints of optical fiber
CN110474677B (en) * 2019-08-16 2020-07-21 王新凤 Method for quickly positioning optical fiber breakpoint
CN112187348A (en) * 2020-10-15 2021-01-05 郭天强 Portable carrying box for optical time domain reflectometer
CN112187348B (en) * 2020-10-15 2021-08-27 郭天强 Portable carrying box for optical time domain reflectometer
CN112968526A (en) * 2021-03-17 2021-06-15 杭州惠嘉信息科技有限公司 Microclimate online monitoring device for high-voltage transmission line

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