CN106017541B - A kind of on-Line Monitor Device and method that subway contact net holder loosens - Google Patents
A kind of on-Line Monitor Device and method that subway contact net holder loosens Download PDFInfo
- Publication number
- CN106017541B CN106017541B CN201610614407.2A CN201610614407A CN106017541B CN 106017541 B CN106017541 B CN 106017541B CN 201610614407 A CN201610614407 A CN 201610614407A CN 106017541 B CN106017541 B CN 106017541B
- Authority
- CN
- China
- Prior art keywords
- contact net
- fixedly connected
- holder
- fibre optic
- connecting plate
- Prior art date
- Legal status (The legal status 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 status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The invention discloses on-Line Monitor Devices and method that a kind of subway contact net holder loosens.It includes Fibre Optical Sensor kinetic analyzer, Transmission Fibers and the contact net holder being set between each contact net and tunnel top, contact net cradle top one end is equipped with connection sheet, connection sheet one end is fixedly connected with contact net bracket end, the other end is fixedly connected with tunnel top, it is fixed with fibre optic strain sensor in the connection sheet, multiple fibre optic strain sensors with optical fiber kinetic analyzer connect forming circuit after connecting by Transmission Fibers.The fastening situation of long distance online real-time monitor contact net can be achieved in the present invention, save the time spent by a large amount of artificial detections and manpower, and reinforced for the maintenance of contact net fastener and abundant data support is provided, it is truly realized on-demand, positioning maintenance, there is stronger practicability.
Description
Technical field
The invention belongs to Metro Tunnel technical fields, and in particular to a kind of online prison that subway contact net holder loosens
Survey device and method.
Background technology
The holder for carrying high-voltage contact net, the dual work of the vibration brought and train Piston Action Wind is back and forth run in train for a long time
Under, installation fastening situation has prodigious looseness fault risk.At this stage, conventional contact net rack arrangement it is intensive, away from
From length, the loosening of mounting bracket does not have effective on-line monitoring, generally relies on and manually regularly patrols, according to label phase
Displacement judged whether to position, routing inspection efficiency is low, easy omission.
Invention content
The purpose of the present invention is exactly insufficient existing for above-mentioned background technology in order to solve, and is provided a kind of inexpensive, highly reliable
Property, real-time online subway contact net holder loosen on-Line Monitor Device and method.
The technical solution adopted by the present invention is：A kind of on-Line Monitor Device that subway contact net holder loosens, including optical fiber
Kinetic analyzer, Transmission Fibers and the contact net holder being set between each contact net and tunnel top are sensed, it is described to connect
Net-fault cradle top is fixedly connected with tunnel top, bottom is fixedly connected with contact net, and contact net cradle top one end is set
There is connection sheet, connection sheet one end is fixedly connected with contact net bracket end, the other end is fixedly connected with tunnel top, the connection
On piece is fixed with fibre optic strain sensor, multiple fibre optic strain sensors connected by Transmission Fibers after with optical fiber kinetic analyzer
Connection forming circuit.
Further, the contact net holder includes the first connecting plate being fixedly connected with tunnel top, consolidates with contact net
Surely the second connecting plate and connecting bracket connected, first connecting plate and the second connecting plate are arranged in parallel, the connecting bracket
It is fixed between the first connecting plate and the second connecting plate, described connection sheet one end is fixedly connected with the end of the first connecting plate.
Further, the connecting bracket is the holder of falling Y-shaped, and the top for the holder of falling Y-shaped is fixed with the first connecting plate
Connection, bottom both ends are fixedly connected with the second connecting plate.
Further, the connection sheet includes integrated three sections connected, and left section parallel and horizontally disposed with right section, intermediate
Section is in tilted layout, and left section is fixedly connected with contact net holder, and right section is fixedly connected with tunnel top, the fibre optic strain sensor
It is fixed on interlude.
Further, the fibre optic strain sensor includes the strain section positioned at the fixed section at both ends and positioned at middle part, institute
The fixed section for stating both ends is fixed on the interlude of connection sheet.
Further, in the multiple fibre optic strain sensor a fixed section of a fibre optic strain sensor with it is adjacent
A fixed section of another fibre optic strain sensor connected by Transmission Fibers.
A kind of on-line monitoring method that subway contact net holder loosens, in the end of each contact net holder and tunnel top
Fibre optic strain sensor is set between portion, is divided with optical fiber dynamic after being connected by Transmission Fibers between multiple fibre optic strain sensors
Analyzer connection forming circuit, optical fiber kinetic analyzer timing cycle send modulated signal, simultaneously to concatenated fibre optic strain sensor
The signal of reception optical fiber strain transducer feedback, optical fiber kinetic analyzer is according to pair of position in the variation of feedback signal and circuit
It should be related to position and the degree of strain of the fibre optic strain sensor for judging to strain, and then obtain corresponding contact net branch
The loosening situation of frame realizes the on-line monitoring that subway contact net holder loosens.
Further, the contact net cradle top is fixedly connected with tunnel top, bottom is fixedly connected with contact net, institute
It states contact net cradle top one end and is equipped with connection sheet, connection sheet one end is fixedly connected with contact net bracket end, the other end and tunnel
It is fixedly connected at the top of road, the fibre optic strain sensor is fixed in connection sheet.
Further, the contact net holder includes the first connecting plate being fixedly connected with tunnel top, consolidates with contact net
Surely the second connecting plate and connecting bracket connected, first connecting plate and the second connecting plate are arranged in parallel, the connecting bracket
For the holder of falling Y-shaped, the top for the holder of falling Y-shaped is fixedly connected with the first connecting plate, bottom both ends are fixed with the second connecting plate
Connection, described connection sheet one end is fixedly connected with the end of the first connecting plate.
Further, the connection sheet includes integrated three sections connected, and left section is parallel and horizontally disposed with right section, in
Between section be in tilted layout, left section is fixedly connected with contact net holder, and right section is fixedly connected with tunnel top, the fiber strain sensing
Device is fixed on interlude.
The present invention installs fibre optic strain sensor on each contact net holder, is remotely connect by optical fiber kinetic analyzer
The variation of fibre optic strain sensor signal is received to detect the loosening situation of contact net holder, realizes long distance online real-time monitor contact
The fastening situation of net is saved the time spent by a large amount of artificial detections and manpower, and is carried for the maintenance of contact net fastener reinforcing
For abundant data support, it is truly realized on-demand, positioning maintenance, there is stronger practicability, is conducive to raising subway system and transport
Capable safety, popularizing application prospect are wide.
Description of the drawings
Fig. 1 is the principle schematic of the on-line monitoring of the present invention.
Fig. 2 is the structural schematic diagram of the present invention.
Fig. 3 is the schematic diagram of connection sheet of the present invention.
Fig. 4 is the vertical view of Fig. 3.
Fig. 5 is the schematic diagram of fibre optic strain sensor of the present invention.
Fig. 6 is the cooperation schematic diagram of connection sheet of the present invention and fibre optic strain sensor.
Fig. 7 is the schematic diagram that non-monitored end of the present invention loosens.
Fig. 8 is the present invention schematic diagram that directly monitoring side loosens.
In figure：1- Fibre Optical Sensor kinetic analyzers；2- Transmission Fibers；3- contact net holders；The first connecting plates of 3.1-；3.2-
Connecting bracket；The second connecting plates of 3.3-；4- tunnel tops；5- contact nets；6- connection sheets；Left section of 6.1-；6.2- interludes, 6.3-
Right section, 7- fibre optic strain sensors；7.1- fixed section；7.2- strains section.
Specific implementation mode
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments, convenient for this hair is well understood
It is bright, but they do not constitute the present invention and limit.
The present invention is directed to situations such as contact net holder is densely distributed, tunnel distance is long, electromagnetic environment is complicated in subway tunnel,
It is proposed is monitored on-line using distributive fiber optic strain sensing measurement interface differential technique net-fault holder, specific implementation mode principle frame
Figure as shown in Figure 1, between the end and tunnel top of each contact net holder be arranged fibre optic strain sensor 7, be distributed in
Fibre optic strain sensor S1~Sn+1 on each contact net holder connected by Transmission Fibers 2 after with optical fiber kinetic analyzer 1
Connection forming circuit, 1 timing cycle of optical fiber kinetic analyzer concatenated fibre optic strain sensor into circuit send modulated signal
(i.e. each fibre optic strain sensor sequentially into series loop sends signal to Fibre Optical Sensor kinetic analyzer successively, every time
A fibre optic strain sensor sends signal thereto, and each fibre optic strain sensor returns again to after being sent completely to be believed again
Number；Receive signal with send signal as, every time receive a fibre optic strain sensor feed back signal), the signal pass through by
Frequency displacement and phase difference occur for the strain transducer for stretching or being extruded, and are returned in optical fiber kinetic analyzer by circuit, light
Fine kinetic analyzer parses the fibre optic strain sensor strained by detection signal frequency shift, the correspondence of phase change
Position and degree of strain, and then obtain the loosening situation of corresponding contact net holder, realize subway contact net holder pine
Dynamic on-line monitoring.
As illustrated in figs. 2 through 8, realize that the device for the on-line monitoring principle that above-mentioned subway contact net holder loosens, including optical fiber pass
Feel kinetic analyzer 1, Transmission Fibers 2 and the contact net holder 3 being set between each contact net 5 and tunnel top 4, it is described
3 top of contact net holder is fixedly connected with tunnel top 4, bottom is fixedly connected with contact net 5,3 top of the contact net holder
One end is equipped with connection sheet 6, and 6 one end of connection sheet is fixedly connected with 3 top ends of contact net holder, the other end and tunnel top 4 are solid
It is fixed to connect, it is fixed with fibre optic strain sensor 7 in the connection sheet 6, multiple fibre optic strain sensors 7 are gone here and there by Transmission Fibers 2
After connection forming circuit is connect with optical fiber kinetic analyzer 1.
In said program, contact net holder 3 includes the first connecting plate being fixedly connected by pre-embedded bolt with tunnel top 4
3.1, the second connecting plate 3.3 and connecting bracket 3.2 being fixedly connected with contact net 5, first connecting plate 3.1 are connect with second
Plate 3.3 is arranged in parallel, and the connecting bracket 3.2 is fixed between the first connecting plate 3.1 and the second connecting plate 3.3, the connection
6 one end of piece is fixedly connected with the end of the first connecting plate 3.1.Connecting bracket 3.2 is the holder of falling Y-shaped, the top for the holder of falling Y-shaped
Portion is fixedly connected with the first connecting plate 3.1, bottom both ends are fixedly connected with the second connecting plate 3.3, continuous intensive contact net branch
Frame keeps certain height whole contact net and smoothness.
In said program, connection sheet 6 includes three sections of integration connection, as shown in Figure 3, Figure 4, left section 6.1 and right section 6.3
Parallel and horizontally disposed, interlude 6.2 is in tilted layout, left section 6.4 with 3.1 edge of the first connecting plate at the top of contact net holder 3
Be welded and fixed connection, on right section 6.3 trepanning be fixedly connected by pre-embedded bolt with tunnel top 4, the fibre optic strain sensor 7
It is fixed on interlude 6.2, using ductility, good, corrosion-resistant stainless metal material is made connection sheet, and structural behaviour is good.
In said program, fibre optic strain sensor 7 includes the strain section positioned at the fixed section 7.1 at both ends and positioned at middle part
7.2, when implementation, by the fixed section 7.1 at both ends by being fixedly welded on the interlude 6.2 of connection sheet 6, as shown in Figure 5, Figure 6,
The fixed section at both ends is connected with Transmission Fibers respectively, i.e., the one of a fibre optic strain sensor is solid in multiple fibre optic strain sensors
Determine section to connect by Transmission Fibers with a fixed section of another adjacent fibre optic strain sensor.Contact net holder is in a pre-installation
The connection sheet for being welded with fibre optic strain sensor as described above is welded to the design position of contact net bracket edge, when installation,
It is fastened by pre-embedded bolt in conjunction with contact net holder, connection sheet, after installing, is passed using each strain of Transmission Fibers series connection together
Sensor.
When the present invention works, Fibre Optical Sensor kinetic analyzer timing cycle as described above sends modulated signal, receives analysis
Demodulated signal in monitoring circuit, has any one contact net cradle top to loosen, as shown in fig. 7, if non-monitored end
(one end that fibre optic strain sensor is not arranged on contact net holder) loosens, due to symmetrical configuration and supporting relation, prison
It surveys the connection sheet that end is installed and generates racking strain, the fibre optic strain sensor in connection sheet is caused to generate racking strain, i.e. edge
The directions A generate strain in figure, and corresponding fibre optic strain sensor returns to light wave λ i and changes；As shown in figure 8, if monitoring
End (one end that fibre optic strain sensor is arranged i.e. on contact net holder) loosens, and with tunnel top opposite position occurs for monitoring side
It moves, connection sheet as described above generates stretching at this time, and the strain transducer in connection sheet is caused to generate elongation strain, i.e., the B along figure
Direction generates strain, and corresponding fibre optic strain sensor returns to light wave λ i ' and changes.As described above, contact net cradle top
The arbitrary fastening point of the first connecting plate loosen, can cause the strain of connection sheet and fibre optic strain sensor, Fibre Optical Sensor dynamic
Analyzer can calculate position, the dependent variable that strain occurs by the demodulation analysis to fibre optic strain sensor return signal, into
And the loosening situation of corresponding contact net holder is obtained, realize the on-line monitoring that subway contact net holder loosens.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.This explanation
The content not being described in detail in book belongs to the prior art well known to professional and technical personnel in the field.
Claims (7)
1. the on-Line Monitor Device that a kind of subway contact net holder loosens, it is characterised in that：Including Fibre Optical Sensor kinetic analyzer
(1), Transmission Fibers (2) and the contact net holder (3) being set between each contact net and tunnel top, the contact net branch
It is fixedly connected with tunnel top (4) at the top of frame (3), bottom is fixedly connected with contact net (5), contact net holder (3) top
One end is equipped with connection sheet (6), and connection sheet (6) one end is fixedly connected with contact net holder (3) end, the other end and tunnel top
(4) it is fixedly connected, fibre optic strain sensor (7) is fixed on the connection sheet (6), multiple fibre optic strain sensors (7) pass through
After Transmission Fibers (2) series connection forming circuit is connect with optical fiber kinetic analyzer (1)；The connection sheet (6) includes that integration connects
Three sections, left section (6.1) and right section (6.3) are parallel and horizontally disposed, interlude (6.2) be in tilted layout, left section (6.1) with contact
Net holder (3) is fixedly connected, and right section (6.3) are fixedly connected with tunnel top (4), and the fibre optic strain sensor (7) is fixed on
On interlude (6.2).
2. the on-Line Monitor Device that a kind of subway contact net holder according to claim 1 loosens, it is characterised in that：It is described
Contact net holder (3) includes the first connecting plate (3.1) being fixedly connected with tunnel top, second be fixedly connected with contact net company
Fishplate bar (3.3) and connecting bracket (3.2), first connecting plate (3.1) are arranged in parallel with the second connecting plate (3.3), the company
It connects holder (3.2) to be fixed between the first connecting plate (3.1) and the second connecting plate (3.3), described connection sheet (6) one end and first
The end of connecting plate (3.1) is fixedly connected.
3. the on-Line Monitor Device that a kind of subway contact net holder according to claim 2 loosens, it is characterised in that：It is described
Connecting bracket (3.2) is the holder of falling Y-shaped, and the top for the holder of falling Y-shaped is fixedly connected with the first connecting plate (3.1), bottom two
End is fixedly connected with the second connecting plate (3.3).
4. the on-Line Monitor Device that a kind of subway contact net holder according to claim 1 loosens, it is characterised in that：It is described
Fibre optic strain sensor (7) includes the strain section (7.2) positioned at the fixed section (7.1) at both ends and positioned at middle part, the both ends
Fixed section (7.1) is fixed on the interlude of connection sheet (6).
5. the on-Line Monitor Device that a kind of subway contact net holder according to claim 1 loosens, it is characterised in that：It is described
A fixed section of a fibre optic strain sensor and another adjacent fibre optic strain sensor in multiple fibre optic strain sensors
A fixed section connected by Transmission Fibers.
6. the on-line monitoring method that a kind of subway contact net holder loosens, it is characterised in that：At the end of each contact net holder
Fibre optic strain sensor is set between portion and tunnel top, after being connected by Transmission Fibers between multiple fibre optic strain sensors with
Optical fiber kinetic analyzer connection forming circuit, optical fiber kinetic analyzer timing cycle send to concatenated fibre optic strain sensor and adjust
Signal processed, by the strain transducer for being stretched or being extruded frequency displacement and phase difference occur for signal, and return to light by circuit
In fine kinetic analyzer, optical fiber kinetic analyzer is strained by detecting the correspondence parsing of signal frequency shift, phase change
The position of fibre optic strain sensor and degree of strain, and then the loosening situation of corresponding contact net holder is obtained, realize ground
The on-line monitoring that iron contact net holder loosens；
Contact net holder (3) top is fixedly connected with tunnel top (4), bottom is fixedly connected with contact net (5), described to connect
One end is equipped with connection sheet (6) at the top of net-fault holder (3), and connection sheet (6) one end is fixedly connected, separately with contact net holder (3) end
One end is fixedly connected with tunnel top (4), and the fibre optic strain sensor (7) is fixed in connection sheet (6)；The connection sheet
(6) include integrated three sections connected, left section (6.1) and right section (6.3) are parallel and horizontally disposed, and interlude (6.2) tilts cloth
It sets, left section (6.1) are fixedly connected with contact net holder (3), and right section (6.3) are fixedly connected with tunnel top (4), and the optical fiber is answered
Become sensor (7) to be fixed on interlude (6.2).
7. the on-line monitoring method that a kind of subway contact net holder according to claim 6 loosens, it is characterised in that：It is described
Contact net holder (3) includes the first connecting plate (3.1) being fixedly connected with tunnel top, second be fixedly connected with contact net company
Fishplate bar (3.3) and connecting bracket (3.2), first connecting plate (3.1) are arranged in parallel with the second connecting plate (3.3), the company
It is the holder of falling Y-shaped to connect holder (3.2), and the top for the holder of falling Y-shaped is fixedly connected with the first connecting plate (3.1), bottom both ends
It is fixedly connected with the second connecting plate (3.3), described connection sheet (6) one end is fixedly connected with the end of the first connecting plate (3.1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610614407.2A CN106017541B (en) | 2016-07-29 | 2016-07-29 | A kind of on-Line Monitor Device and method that subway contact net holder loosens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610614407.2A CN106017541B (en) | 2016-07-29 | 2016-07-29 | A kind of on-Line Monitor Device and method that subway contact net holder loosens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106017541A CN106017541A (en) | 2016-10-12 |
| CN106017541B true CN106017541B (en) | 2018-08-28 |
Family
ID=57115246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610614407.2A Active CN106017541B (en) | 2016-07-29 | 2016-07-29 | A kind of on-Line Monitor Device and method that subway contact net holder loosens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106017541B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112145907B (en) * | 2020-10-13 | 2022-02-01 | 深圳市星启源机电有限公司 | Anti-drop self-display type anti-seismic support hanger |
| CN114383556B (en) * | 2022-01-06 | 2023-08-04 | 杭州申昊科技股份有限公司 | Detection device and method for rigid contact net |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2720406Y (en) * | 2004-08-16 | 2005-08-24 | 北京嘉润森盛光纤传感科技有限公司 | Optical-fiber grating or optical strain transducing head and strain measuring system |
| DE102008055926B4 (en) * | 2007-11-08 | 2012-01-26 | Ksm Castings Gmbh | Front axle for motor vehicles |
| CN100575006C (en) * | 2007-12-24 | 2009-12-30 | 沈阳重型机械集团有限责任公司 | Manipulator of automatic positioning and rapid grasping pipe piece |
| CN201753600U (en) * | 2010-06-22 | 2011-03-02 | 河北钢铁集团矿业有限公司 | Optical fiber monitoring device for mine shaft deformation |
| CN102564322B (en) * | 2012-01-18 | 2014-09-10 | 上海波汇通信科技有限公司 | System for monitoring sag of overhead wire in real time |
| JP5987341B2 (en) * | 2012-02-17 | 2016-09-07 | マツダ株式会社 | Rear subframe body mounting structure |
| CN103528624B (en) * | 2013-10-18 | 2016-03-30 | 中国航空工业集团公司北京长城计量测试技术研究所 | The comprehensive on-line real-time measuremen of optical fiber type pantograph and control system |
| CN105089702B (en) * | 2015-08-27 | 2017-09-15 | 中设设计集团股份有限公司 | It is a kind of to monitor the system and method for shield tunnel faulting of slab ends on-line in high precision on a large scale |
| CN205919842U (en) * | 2016-07-29 | 2017-02-01 | 中铁第四勘察设计院集团有限公司 | Not hard up on -line monitoring device of subway contact net support |
-
2016
- 2016-07-29 CN CN201610614407.2A patent/CN106017541B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106017541A (en) | 2016-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106017541B (en) | A kind of on-Line Monitor Device and method that subway contact net holder loosens | |
| CN101520386B (en) | Fracture test device with double-material interface | |
| CN108732614B (en) | A kind of online railway monitoring system and method based on distributed acoustic sensor | |
| CN1833938A (en) | Force detector and detection method for stress generated by defferent temp of long rail | |
| CN205919842U (en) | Not hard up on -line monitoring device of subway contact net support | |
| CN112033669B (en) | DAS-based fault monitoring method for grooved carrier roller of belt conveyor | |
| CN103194942B (en) | Track vibration signal motion detection device and detection method | |
| CN207374427U (en) | A kind of Riding-type Monorail Switch optic-fiber monitoring system | |
| CN201983991U (en) | Multifunctional flexible pipe testing device | |
| CN101655354B (en) | Method for detecting deformation and internal force of underground H type steel by optical fiber | |
| CN214373020U (en) | Signal acquisition device for bridge reinforcing steel bar elastic stress detection | |
| CN107089244A (en) | A kind of railway switch damage detection system | |
| CN211855433U (en) | Building site environment detection device | |
| CN201951493U (en) | Fiber grating sensing train wheel tread on-line monitoring device | |
| CN217123160U (en) | Rail device for coal mine inspection robot | |
| CN219389302U (en) | Tool for railway vehicle detection experiment | |
| CN103115762A (en) | Tension testing machine | |
| CN207215452U (en) | A kind of artificial limb simulator fatigue test device | |
| CN216207462U (en) | Bolt looseness detection system for bridge expansion joint | |
| CN202359287U (en) | Dynamic weft extension measuring system | |
| CN208701427U (en) | A kind of track switch girder construction adapting to magnetic suspension operation vehicle speed measuring | |
| CN209382877U (en) | A kind of conveyer belt dynamic centralising device | |
| CN209656497U (en) | A kind of detection of metal filtration film surface tension is with determining assembling structure | |
| CN208255209U (en) | A kind of marine exhaust washing water analysis and detecting instrument | |
| CN216841820U (en) | Tunnel and piping lane sensing optical fiber detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |