CN108035383B - Intelligent well lid for cable tunnel - Google Patents
Intelligent well lid for cable tunnel Download PDFInfo
- Publication number
- CN108035383B CN108035383B CN201711380397.1A CN201711380397A CN108035383B CN 108035383 B CN108035383 B CN 108035383B CN 201711380397 A CN201711380397 A CN 201711380397A CN 108035383 B CN108035383 B CN 108035383B
- Authority
- CN
- China
- Prior art keywords
- hole
- well
- lid
- contact switch
- well ring
- 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
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 230000002528 anti-freeze Effects 0.000 claims abstract description 4
- 230000007306 turnover Effects 0.000 claims abstract 2
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 2
- 238000007906 compression Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 5
- GQWNECFJGBQMBO-UHFFFAOYSA-N Molindone hydrochloride Chemical compound Cl.O=C1C=2C(CC)=C(C)NC=2CCC1CN1CCOCC1 GQWNECFJGBQMBO-UHFFFAOYSA-N 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
- E02D29/1427—Locking devices
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
- E02D29/1481—Security devices, e.g. indicating unauthorised opening
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The intelligent well lid of cable tunnel includes the well ring, install the lid on the well ring, lid one end is articulated with the well ring, offer the spring bolt hole on the lid other end lateral wall relative with this articulated department, install the lock core on the well ring that is close to spring bolt hole position, the pivot and the spring bolt of lock core are connected, the lock core can drive the spring bolt business turn over spring bolt hole, well ring periphery wall bottom sets up spacing protruding edge, well ring inner peripheral wall bottom sets up interior bulge loop, set up the layer board on the interior bulge loop, the layer board, the cavity is enclosed jointly to the lateral wall of lid and well ring, install the liquid bag in the cavity, be full of antifreeze on the liquid bag, set up the through-hole on the layer board, install contact switch in the through-hole, contact switch passes through the support and is connected with the through-hole lateral wall, contact switch top sets up the fly leaf. The invention has the advantages that: can send out the alarm immediately when the well lid is damaged, remind relevant unit to overhaul this well lid, can play interim closure effect to the damage after the well lid is damaged, alarm device can long-range self-checking etc..
Description
Technical Field
The invention relates to a cable tunnel wellhead sealing device, in particular to an intelligent well lid of a cable tunnel.
Background
Traditional cable lines are erected in an overhead mode, but as the urban scale is continuously enlarged, the building density in the urban area is increased, the cable overhead lines are erected among the buildings, on one hand, the space limitation among the buildings is realized, and on the other hand, the crisscross arrangement of a large number of overhead cables also seriously affects the beautiful environment of the urban area. With the continuous perfection of tunnel construction technology, in recent years, cable tunnels are built underground in urban areas, so that the cable tunnels do not occupy ground space and do not influence urban environment, and a large number of cable lines can be accommodated in the tunnels, so that the requirements of large cities on power grid density are met. Every section distance in cable tunnel all needs to set up the shaft that supplies staff and equipment to come in and go out, shaft well head department is sealed by the well lid, prevent rainwater and other debris entering tunnel in, because many shafts are set up on the road, the well lid needs to bear the vehicle that goes forward and backward on the road and roll repeatedly, the well lid is difficult to avoid appearing the damage after rolling for a long time, if the well lid of cable tunnel is damaged does not in time obtain the change after, a large amount of rainwater can surging into in the cable tunnel when meetting the precipitation, cause power equipment trouble, still can form the electric leakage accident when serious, seriously threaten passersby's life safety.
Disclosure of Invention
The invention aims to provide an intelligent well lid for a cable tunnel, which can immediately give an alarm when the well lid is damaged, and remind related units to overhaul the well lid.
The invention aims to achieve the aim, and the aim is achieved by the following technical scheme: the anti-freezing device comprises a well ring, a cover body is arranged on the well ring, one end of the cover body is hinged with the well ring, a lock tongue hole is formed in the side wall of the other end of the cover body opposite to the hinged position, a lock cylinder is arranged on the well ring and close to the lock tongue hole, a rotating shaft of the lock cylinder is connected with the lock tongue, the lock cylinder can drive the lock tongue to enter and exit the lock tongue hole, a limiting convex edge is arranged at the bottom of the peripheral wall of the well ring, an inner convex ring is arranged at the bottom of the inner peripheral wall of the well ring, a supporting plate is arranged on the inner convex ring, a cavity is jointly formed by the supporting plate, the cover body and the side wall of the well ring, a liquid bag is arranged in the cavity, antifreeze liquid is filled in the liquid bag, a through hole is formed in the supporting plate, a contact switch is arranged in the through hole, the contact switch is connected with the side wall of the through hole, a movable plate is arranged between the movable plate and the movable plate, when the movable plate moves downwards to be compressed, the movable plate can press down contacts of the contact switch, and the movable plate moves upwards, the movable plate is separated from contacts of the contact switch through a circuit, the contact switch is connected with the contact switch through the circuit, and the ring-shaped controller, and the signal can be connected with a power source controller through the power supply. The inner side circumference of the top surface of the well ring is provided with a groove, the cover body is matched with the groove, the cover body is provided with a screw hole, a bolt is arranged in the screw hole, and the bottom end of the bolt is contacted with the top surface of the groove. The screw hole is a countersunk hole, and a protective cover is arranged at the top end of the countersunk hole. The blind hole is formed in the inner wall of the well ring, the electric push rod is arranged in the blind hole and connected with the controller through a circuit, the controller can control the electric push rod to stretch out and draw back, the baffle is arranged at the end part of the movable rod of the electric push rod and can move in the blind hole under the driving of the electric push rod, when the electric push rod is in an extending state, the baffle is positioned at the opening of the blind hole and is in contact with the liquid bag, and when the electric push rod is in a contracting state, the baffle can retract inside the blind hole.
The invention has the advantages that: can send out the alarm immediately when the well lid is damaged, remind relevant unit to overhaul this well lid, can play interim closure effect to the damage after the well lid is damaged, alarm device can long-range self-checking etc..
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic cross-sectional view of A-A of FIG. 1;
FIG. 3 is a schematic view of the cross-sectional B-B structure of FIG. 1;
fig. 4 is an enlarged schematic view of the structure of the section I in fig. 3.
Detailed Description
The intelligent well lid for the cable tunnel comprises a well ring (1), a cover body (2) is arranged on the well ring (1), one end of the cover body (2) is hinged with the well ring (1), a lock tongue hole (3) is formed in the side wall of the other end of the cover body (2) opposite to the hinged position, a lock cylinder (4) is arranged on the well ring (1) close to the position of the lock tongue hole (3), a rotating shaft of the lock cylinder (4) is connected with the lock tongue (5), the lock cylinder (4) can drive the lock tongue (5) to enter and exit the lock tongue hole (3), a limiting flange (6) is arranged at the bottom of the peripheral wall of the well ring (1), an inner convex ring (7) is arranged at the bottom of the inner peripheral wall of the well ring (1), a supporting plate (8) is arranged on the inner convex ring (7), a cavity (9) is jointly formed by enclosing the supporting plate (8), the cover body (2) and the side wall of the well ring (1), a liquid bag (10) is arranged in the cavity (9), the liquid bag (10) is filled with antifreeze liquid, a through hole (11) is formed in the position of the well ring (8), a contact switch (12) is arranged in the through hole (11), the support (22), the contact switch (12) is connected with a movable plate (23) through a support (22), and a movable plate (23) is arranged between the movable plate (23), the spring (24) is compressed, the movable plate (23) can press down the contact of the contact switch (12), when the movable plate (23) moves upwards, the spring (24) is relaxed, the movable plate (23) is separated from the contact of the contact switch (12), the bottom surface of the supporting plate (8) is provided with the contact piece (13), the contact piece (13) is connected with the contact switch (12) through a circuit, the annular contact piece (14) is arranged on the periphery of the top surface of the inner convex ring (7), when the supporting plate (8) is placed on the inner convex ring (7), the contact piece (13) can be contacted with the annular contact piece (14) and conducted, the controller (15) is arranged in the well ring (1) and is connected with the annular contact piece (14) and the lock cylinder (4) through circuits, the controller (15) can detect the opening and closing states of the contact switch (12) and the lock cylinder (4) through the circuits, and the controller (15) is connected with a signal transmission line and a power circuit. During installation, the well ring 1 is fixed at the well mouth of the cable tunnel vertical shaft, and a signal transmission line and a power circuit of the controller (15) are connected with a reserved signal line and a reserved power line of the cable tunnel. The limiting convex edge 6 of the outer peripheral wall of the well ring 1 can be embedded under the pavement layer after pavement is paved, so that the well ring 1 is firmly and reliably installed. The supporting plate (8) is placed on the inner convex ring 7 of the well ring 1, the liquid bag (10) is placed on the supporting plate 8, after the cover body (2) is buckled with the well ring (1), the liquid bag (10) in the cavity (9) is extruded, the liquid bag (10) protrudes from the through hole (11) to extrude the movable plate (23), the movable plate (23) overcomes the elasticity of the spring 24 to move towards one side of the contact switch (12), the contact of the contact switch (12) is pressed, at the moment, the controller (15) detects that the contact of the contact switch 12 is pressed, and the well cover is judged to be in a normal state. After the cover body 2 is buckled, a lock cylinder (4) on the well ring (1) can drive a lock tongue (5) to enter and exit a lock tongue hole (3) on the cover body 2, so that the cover body 2 can be locked or unlocked, and the lock cylinder 4 can be a mechanical lock cylinder, an electromagnetic chip induction type electronic lock cylinder and the like. The controller (15) can detect the state of lock core 4 through circuit state or sensor, when lid 2 appears damaging, the liquid bag 10 bulges from the damage, pressure in cavity 9 reduces, the pressure of liquid bag 10 to fly leaf (23) reduces, fly leaf (23) leaves contact switch (12) under spring 24's elasticity effect, the contact spring of contact switch (12) when lock core (4) locking state is detected to controller (15), judge that the well lid state is unusual, send alarm signal immediately, the liquid bag 10 that the damaged department of lid 2 bulges can play temporary closure effect to the damage, still can temporarily guarantee its water-proof effects when lid 2 damaged area is less.
In order to adjust the triggering sensitivity of the contact switch (12), the inner circumference of the top surface of the well ring (1) is provided with the groove (16), the cover body (2) is matched with the groove (16), the cover body (2) is provided with the screw hole (17), the screw hole (17) is internally provided with the bolt (18), and the bottom end of the bolt (18) is contacted with the top surface of the groove (16). The operator can use the tool to rotate the bolt 18 to adjust the extension amount of the lower end of the bolt 18 relative to the bottom surface of the cover body 2, adjust the volume of the cavity 9 between the cover body 2 and the supporting plate 8, and realize the adjustment of the triggering sensitivity of the contact switch (12). In order to avoid the protrusion of the bolt 18, the screw hole 17 can be manufactured into a countersunk hole, and a protective cover (28) is arranged at the top end of the countersunk hole.
According to the invention, in order to carry out self-checking on the alarm device regularly, the situation that the well lid cannot be disposed in time when the alarm device is damaged is avoided, a blind hole (19) can be formed in the inner wall of the well ring (1), an electric push rod (20) is installed in the blind hole (19), the electric push rod (20) is connected with a controller (15) through a circuit, the controller (15) can control the electric push rod (20) to stretch out and draw back, a baffle plate (21) is installed at the end part of a movable rod of the electric push rod (20), the baffle plate (21) can move in the blind hole (19) under the driving of the electric push rod (20), when the electric push rod (20) is in an extending state, the baffle plate (21) is positioned at the opening of the blind hole (19) and is in contact with a liquid bag (10), and when the electric push rod (20) is in a contracting state, the baffle plate (21) can retract into the blind hole (19). When the electric push rod 20 is in an extending state normally and needs to be self-inspected, a worker can remotely control the electric push rod (20) to shrink through a signal line, so that the baffle plate (21) is retracted into the blind hole 19, the liquid sac 10 at the opening of the blind hole 19 protrudes towards the inside of the blind hole 19, the pressure of the movable plate 23 in the through hole 11 is reduced, the movable plate 23 leaves the contact switch (12) under the action of the elastic force of the spring 24, and an alarm is normally sent out by the controller (15) at the moment, and the alarm device of the well lid is judged to work normally. After self-checking, the remote control electric push rod 20 is restored to an extension state, the baffle plate (21) pushes the liquid bag 10 which is blown into the blind hole 19 back to the opening of the blind hole 19, the pressure of the movable plate 23 in the through hole 11 is increased, the movable plate 23 overcomes the elasticity of the spring 24 and moves to one side of the contact switch (12), and the contact of the contact switch (12) is pressed down. If the controller 15 does not normally give an alarm during self-checking, the state of the alarm device of the well lid is judged to be abnormal, and the well lid and the alarm device thereof need to be overhauled immediately.
Claims (2)
1. Cable tunnel intelligence well lid, its characterized in that: including well ring (1), install lid (2) on well ring (1), lid (2) one end is articulated with well ring (1), offer spring bolt hole (3) on the lid (2) other end lateral wall relative with this articulated department, install lock core (4) on well ring (1) near spring bolt hole (3) position, the pivot and the spring bolt (5) of lock core (4) are connected, lock core (4) can drive spring bolt (5) business turn over spring bolt hole (3), well ring (1) periphery wall bottom sets up spacing protruding edge (6), well ring (1) inner peripheral wall bottom sets up interior bulge loop (7), set up layer board (8) on interior bulge loop (7), layer board (8), lid (2) and well ring (1) lateral wall enclose cavity (9) jointly, install liquid bag (10) in cavity (9), be full of antifreeze in liquid bag (10), set up through-hole (11) on layer board (8), install contact switch (12) in through-hole (11), contact switch (12) are connected with through support (11) lateral wall, contact switch (12) side wall, contact switch (23) top side board (23) are moved with compression spring (24) under the compression spring (24), the movable plate (23) can press down the contact of the contact switch (12), when the movable plate (23) moves upwards, the spring (24) is relaxed, the movable plate (23) is separated from the contact of the contact switch (12), the bottom surface of the supporting plate (8) is provided with the contact piece (13), the contact piece (13) is connected with the contact switch (12) through a circuit, the annular contact piece (14) is arranged on the periphery of the top surface of the inner convex ring (7), when the supporting plate (8) is placed on the inner convex ring (7), the contact piece (13) can be contacted with the annular contact piece (14) and conducted, the controller (15) is arranged in the well ring (1) and is connected with the annular contact piece (14) and the lock cylinder (4) through circuits, the controller (15) can detect the opening and closing states of the contact switch (12) and the lock cylinder (4) through the circuits, and the controller (15) is connected with a signal transmission circuit and a power supply circuit;
the controller (15) can detect the state of the lock cylinder (4) through a circuit state or a sensor, when the pressure of the liquid bag (10) on the movable plate (23) is reduced, the movable plate (23) can leave the contact switch (12) under the action of the elastic force of the spring (24), the controller (15) detects that the contact of the contact switch (12) is sprung when the lock cylinder (4) is in a locking state, the state of the well cover is abnormal, and an alarm signal is immediately sent out;
a groove (16) is formed in the peripheral ring on the inner side of the top surface of the well ring (1), the cover body (2) is matched with the groove (16), a screw hole (17) is formed in the cover body (2), a bolt (18) is arranged in the screw hole (17), and the bottom end of the bolt (18) is contacted with the top surface of the groove (16);
a blind hole (19) is formed in the inner wall of the well ring (1), an electric push rod (20) is arranged in the blind hole (19), the electric push rod (20) is connected with a controller (15) through a circuit, the controller (15) can control the electric push rod (20) to stretch out and draw back, a baffle (21) is arranged at the end part of a movable rod of the electric push rod (20), the baffle (21) can move in the blind hole (19) under the driving of the electric push rod (20), when the electric push rod (20) is in an extending state, the baffle (21) is located at the opening of the blind hole (19) and is in contact with a liquid bag (10), and when the electric push rod (20) is in a contracting state, the baffle (21) can retract inside the blind hole (19).
2. The cable tunnel intelligent manhole cover of claim 1, wherein: the screw hole (17) is a countersunk hole, and a protective cover (28) is arranged at the top end of the countersunk hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711380397.1A CN108035383B (en) | 2017-12-20 | 2017-12-20 | Intelligent well lid for cable tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711380397.1A CN108035383B (en) | 2017-12-20 | 2017-12-20 | Intelligent well lid for cable tunnel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108035383A CN108035383A (en) | 2018-05-15 |
| CN108035383B true CN108035383B (en) | 2024-03-12 |
Family
ID=62100227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711380397.1A Active CN108035383B (en) | 2017-12-20 | 2017-12-20 | Intelligent well lid for cable tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108035383B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118135754A (en) * | 2024-04-03 | 2024-06-04 | 广州城市电力工程有限公司 | Wireless alarm method and system for intelligent cable trench cover plate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2310043C1 (en) * | 2006-02-26 | 2007-11-10 | Государственное Унитарное Предприятие "Водоканал Санкт-Петербурга" | Inspection well hatch lid |
| CN201614282U (en) * | 2010-02-09 | 2010-10-27 | 北京均友欣业科技有限公司 | Electrostatic oil overflow warning device used for top loading |
| CN102118440A (en) * | 2011-02-01 | 2011-07-06 | 北京清大博海科技有限公司 | Centralized monitoring system of cable inspection well |
| CN204087398U (en) * | 2014-09-03 | 2015-01-07 | 贵州电网公司信息通信分公司 | A kind of walling crib formula well lid monitoring alarm triggered device |
| CN207891919U (en) * | 2017-12-20 | 2018-09-21 | 国家电网公司 | Cable tunnel intelligent well cover |
-
2017
- 2017-12-20 CN CN201711380397.1A patent/CN108035383B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2310043C1 (en) * | 2006-02-26 | 2007-11-10 | Государственное Унитарное Предприятие "Водоканал Санкт-Петербурга" | Inspection well hatch lid |
| CN201614282U (en) * | 2010-02-09 | 2010-10-27 | 北京均友欣业科技有限公司 | Electrostatic oil overflow warning device used for top loading |
| CN102118440A (en) * | 2011-02-01 | 2011-07-06 | 北京清大博海科技有限公司 | Centralized monitoring system of cable inspection well |
| CN204087398U (en) * | 2014-09-03 | 2015-01-07 | 贵州电网公司信息通信分公司 | A kind of walling crib formula well lid monitoring alarm triggered device |
| CN207891919U (en) * | 2017-12-20 | 2018-09-21 | 国家电网公司 | Cable tunnel intelligent well cover |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108035383A (en) | 2018-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207891919U (en) | Cable tunnel intelligent well cover | |
| KR101300252B1 (en) | The underground rise and fall system by instrumentation measured supervisory remote and incoming switchboard control panel | |
| CN108035383B (en) | Intelligent well lid for cable tunnel | |
| CN112112679A (en) | Multifunctional supporting safety column for mining roadway | |
| CN108343090A (en) | Subway control system inspection-pit intelligent well cover | |
| CN201234063Y (en) | Intelligent anti-damage power switch box | |
| CN104343134A (en) | Manhole cover based on Internet of Things | |
| CN214993271U (en) | Road traffic safety warns auxiliary assembly | |
| CN104142547A (en) | Embedded optical cable splice box prevented from being submersed by water | |
| CN109693570A (en) | A kind of burglar alarm of new-energy automobile charging pile | |
| CN204551712U (en) | A kind of plumbing well lid | |
| CN112575815A (en) | Cable well safety net and using method thereof | |
| CN203894451U (en) | Optical cable cross-connecting box for preventing box from being flooded by water | |
| CN216713109U (en) | Water supply and drainage well cover | |
| CN112554234A (en) | Cable well and cable well construction method | |
| CN218597226U (en) | Intelligent well lid with anti-theft structure | |
| CN214737602U (en) | Hidden intelligent ground lock | |
| CN214625971U (en) | Distribution box protection device | |
| CN218813267U (en) | Solar spike shell structure | |
| CN112854053A (en) | Hidden intelligent ground lock | |
| CN216551783U (en) | Anti-backflow device for transformer substation field area | |
| CN219759173U (en) | Be used for mine information safety device | |
| CN210441947U (en) | Water level warning pole for road | |
| CN211523289U (en) | City piping lane intelligence well lid | |
| CN115234080B (en) | On-site warning device based on mine construction engineering construction safety |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |