CN114855666A - Highway construction early warning device - Google Patents
Highway construction early warning device Download PDFInfo
- Publication number
- CN114855666A CN114855666A CN202210601899.7A CN202210601899A CN114855666A CN 114855666 A CN114855666 A CN 114855666A CN 202210601899 A CN202210601899 A CN 202210601899A CN 114855666 A CN114855666 A CN 114855666A
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- China
- Prior art keywords
- plate
- early warning
- adjusting
- lifting
- warning device
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- 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.)
- Pending
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- 238000010276 construction Methods 0.000 title claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 38
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims description 24
- 239000000428 dust Substances 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/688—Free-standing bodies
- E01F9/692—Portable base members therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/623—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection
- E01F9/646—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection extensible, collapsible or pivotable
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Signs Or Road Markings (AREA)
Abstract
The invention is suitable for the technical field of road engineering, and provides a highway construction early warning device, which comprises: the lifting device comprises a base, a lifting plate and a frame body, wherein the frame body is arranged on the lifting plate; the lifting assembly is arranged on the base; the early warning mechanism is arranged in a space formed by the lifting plate and the frame body; the early warning device comprises a frame body, a lifting plate, a warning board and an adjusting plate, wherein the frame body is provided with at least one group of first cleaning plates, the adjusting plate is in running fit with the lifting plate, a rotating assembly used for driving the adjusting plate to rotate is further arranged in a base, the warning board is in running fit with the adjusting plate, the warning board can rotate along with the adjusting plate, and an adjusting assembly used for driving the warning board to slide on the adjusting plate is further arranged on the adjusting plate.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a highway construction early warning device.
Background
Road engineering refers to the whole process of planning, designing, constructing, maintaining and managing work performed by taking a road as an object and the engineering entity engaged in the whole process. Road works, like civil engineering of any other gate type, have obvious technical, economic and regulatory aspects. In the highway construction process, early warning device can often be used to warn pedestrian and vehicle.
The existing highway construction early warning device is generally more traditional, only by a mode of standing a warning board, the early warning effect is poor, the warning board is very easy to cover dust after being used for a long time, and certain potential safety hazards exist. Therefore, in view of the above situation, it is urgently needed to provide a highway construction early warning device to overcome the shortcomings in the current practical application.
Disclosure of Invention
The invention aims to provide a highway construction early warning device, aiming at solving the following problems: the existing highway construction early warning device is generally more traditional, only by a mode of standing a warning board, the early warning effect is poor, the warning board is very easy to cover dust after being used for a long time, certain potential safety hazards exist, and therefore the highway construction early warning device is difficult to be widely applied.
The invention is realized in this way, a highway construction early warning device, the highway construction early warning device includes:
the lifting device comprises a base, a lifting plate and a frame body, wherein the frame body is arranged on the lifting plate;
the lifting assembly is arranged on the base and used for adjusting the working position of the lifting plate; and
the early warning mechanism is arranged in a space formed by the lifting plate and the frame body; wherein early warning mechanism includes first clearance board, warning sign and regulating plate, first clearance board is in at least be provided with a set ofly on the support body, the regulating plate with normal running fit between the lifter plate, and still be provided with in the base and be used for driving regulating plate pivoted rotating assembly, the warning sign with sliding fit between the regulating plate, and the warning sign is provided with a set ofly at least, the warning sign can follow the regulating plate and rotate, still be provided with on the regulating plate and be used for driving gliding adjusting part of warning sign on the regulating plate.
Compared with the prior art, the invention has the beneficial effects that: the lifting assembly realizes the adjustment treatment of the working position of the early warning mechanism in a mode of adjusting the working height of the lifting plate, so that the use requirements of different environments are met, the practicability of the device is improved, the surface of the warning plate and the surface of the first cleaning plate are positioned on the same circumference in a mode of driving three groups of warning plates to simultaneously move outwards in a diffused mode, so that the warning work of the first cleaning plate is realized conveniently, the surface of the warning plate and the inner side of the first cleaning plate are positioned on the same circumference in a mode of driving the three groups of warning plates to simultaneously move inwards by the adjusting assembly, and the warning plate and the first cleaning plate are rubbed by matching with a mode of driving the adjusting plate to rotate by the rotating assembly, so that the dust on the surface of the warning plate is cleaned; compared with the prior art, the early warning device is provided with the early warning mechanism, and the early warning device avoids the problems that the existing device is poor in early warning effect only by a mode of standing the warning board, and the warning board is easy to cover dust and has certain potential safety hazard after being used for a long time due to the fact that the early warning mechanism is provided with the rotating assembly, the adjusting assembly, the first cleaning plate, the warning board and the adjusting plate in a matched mode.
Drawings
Fig. 1 is a schematic front view of an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional structure diagram of an embodiment of the invention.
Fig. 3 is a schematic top view of the warning board and the cleaning board in fig. 1.
Fig. 4 is an enlarged schematic view of a portion a in fig. 3.
Fig. 5 is a schematic view of the working state of the warning board in fig. 3 during cleaning.
Fig. 6 is a schematic top view of an adjusting plate according to an embodiment of the invention.
In the drawings: 1-base, 2-lifting column, 3-transmission rod, 4-lifting plate, 5-frame body, 6-first cleaning plate, 7-warning plate, 8-communicating groove, 9-driving rod, 10-linkage rod, 11-sliding block, 12-second cleaning plate, 13-display screen, 14-guiding groove, 15-guiding block, 16-adjusting plate, 17-universal wheel, 18-adjusting column, 19-connecting rod, 20-electric push rod, 21-connecting block, 22-guiding column, 23-first driving motor, 24-threaded rod, 25-gear set, 26-second driving motor, 27-transmission shaft, 28-moving groove and 29-connecting seat.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Specific implementations of the present invention are described in detail below with reference to specific embodiments.
Referring to fig. 1 to 6, a road construction early warning device according to an embodiment of the present invention includes:
the device comprises a base 1, a lifting plate 4 and a frame body 5, wherein the frame body 5 is arranged on the lifting plate 4;
the lifting assembly is arranged on the base 1 and used for adjusting the working position of the lifting plate 4; and
the early warning mechanism is arranged in a space formed by the lifting plate 4 and the frame body 5; wherein early warning mechanism includes first clearance board 6, warning sign 7 and regulating plate 16, first clearance board 6 is in be provided with a set ofly on the support body 5 at least, regulating plate 16 with normal running fit between the lifter plate 4, and still be provided with in the base 1 and be used for driving regulating plate 16 pivoted rotating assembly, warning sign 7 with sliding fit between the regulating plate 16, and warning sign 7 is provided with a set ofly at least, warning sign 7 can follow regulating plate 16 and rotate, still be provided with on the regulating plate 16 and be used for driving warning sign 7 gliding adjusting part on regulating plate 16.
In the embodiment of the invention, the first cleaning plate 6 and the warning board 7 are respectively provided with three groups, the first cleaning plate 6 and the warning board 7 are arranged at intervals (as shown in figure 3), the lifting assembly realizes the adjustment treatment of the working position of the warning mechanism by adjusting the working height of the lifting plate 4, so as to meet the use requirements of different environments, thereby improving the practicability of the device, the adjustment assembly drives the three groups of warning boards 7 to simultaneously diffuse outwards to enable the surface of the warning board 7 and the surface of the first cleaning plate 6 to be positioned on the same circumference (as shown in figure 3), so as to conveniently realize the warning work of the first cleaning plate 6, the adjustment assembly drives the three groups of warning boards 7 to simultaneously move inwards to enable the surface of the warning board 7 and the inner side of the first cleaning plate 6 to be positioned on the same circumference (as shown in figure 5), and simultaneously cooperates with the rotation assembly to drive the adjustment plate 16 to rotate, friction is formed between the warning board 7 and the first cleaning plate 6, and then dust on the surface of the warning board 7 is cleaned; the inner side of the first cleaning plate 6 is provided with cleaning cotton, so that dust on the surface of the warning board 7 can be cleaned conveniently, the base 1 is further provided with a universal wheel 17, the movement is convenient, one end, close to the lifting plate 4, of the frame body 5 can adopt a multi-surface hollow structure, the warning board 7 can be displayed in multiple directions conveniently, and the warning range is enlarged; compared with the prior art, the early warning device is provided with the early warning mechanism, and the early warning device avoids the problems that the existing device is poor in early warning effect due to the fact that the early warning device only adopts a mode of standing the warning board, and certain potential safety hazards exist due to the fact that the warning board is easy to cover dust after the early warning device is used for a long time due to the fact that the early warning mechanism is arranged in a matched mode of the rotating component, the adjusting component, the first cleaning plate 6, the warning board 7 and the adjusting plate 16 in the early warning mechanism.
In one embodiment of the present invention, referring to fig. 1-4, the adjusting assembly comprises:
a guide post 22, wherein the guide post 22 is arranged on the adjusting plate 16;
the adjusting column 18 is of a hollow structure, and the adjusting column 18 is sleeved on the guide column 22;
the electric push rods 20 are connected with the adjusting columns 18 through connecting blocks 21 and used for driving the adjusting columns 18 to slide on the guide columns 22; and
one end of the connecting rod 19 is rotatably connected with the adjusting column 18, and the other end of the connecting rod 19 is connected with the warning board 7 through a connecting seat 29;
the connecting block 21 is in running fit with the adjusting column 18;
the connecting rod 19 is in rotating fit with the connecting seat 29.
In this embodiment, the electric push rod 20 drives the adjusting post 18 to slide on the guiding post 22, and simultaneously, the connecting rod 19 is matched to drive the warning board 7 to slide on the adjusting plate 16, so as to adjust the working position of the warning board 7, thereby facilitating the warning and cleaning work.
In an embodiment of the present invention, referring to fig. 3 and 4, the warning board 7 and the first cleaning board 6 are both arc-shaped structures.
In this embodiment, the inner diameter of the first cleaning plate 6 is the same as the outer diameter of the warning board 7, which facilitates the dust cleaning work.
In an embodiment of the present invention, referring to fig. 1, 2 and 6, the adjusting plate 16 is further provided with a moving slot 28, and the warning board 7 is slidably connected to the moving slot 28 through a guide block 15.
In the present embodiment, the guide block 15 and the moving groove 28 cooperate to define the moving path of the warning board 7.
In one embodiment of the present invention, referring to fig. 2, the rotating assembly includes:
the transmission rod 3 is of a telescopic structure, and the transmission rod 3 is connected with the adjusting plate 16; and
and the first driving motor 23 is used for driving the transmission rod 3 to rotate.
In the present embodiment, the first driving motor 23 is disposed in cooperation with the transmission rod 3, so that the adjusting plate 16 can be driven to rotate on the lifting plate 4.
In one embodiment of the present invention, referring to fig. 1 and 2, the lifting assembly includes:
at least one group of lifting columns 2, wherein the lifting columns 2 are arranged on the lifting plate 4;
the threaded rod 24 is rotatably arranged on the base 1, and the threaded rod 24 is in threaded connection with the lifting column 2;
the second driving motor 26 is installed in the base 1, and a transmission shaft 27 is further installed on the second driving motor 26; and
a gear set 25 for connection between the drive shaft 27 and the threaded rod 24.
In this embodiment, can also be provided with reflective strip on the lift post 2, second driving motor 26, transmission shaft 27 and gear train 25 matched with mode can drive threaded rod 24 and rotate, can drive lift post 2 through threaded rod 24 pivoted mode and move in vertical direction to the realization is handled the regulation of lifter plate 4 operating position.
In an embodiment of the present invention, please refer to fig. 1 and 2, further including a display screen 13 disposed on the frame body 5, wherein the frame body 5 is further provided with a dust removing assembly for cleaning the display screen 13, and the dust removing assembly includes:
the guide grooves 14 are formed in the frame body 5, and the slide blocks 11 are further mounted on the guide grooves 14;
the second cleaning plate 12, the second cleaning plate 12 is mounted on the slide block 11;
the communicating groove 8 is formed in the frame body 5, and the communicating groove 8 is formed in the frame body 5;
the driving rod 9, the said driving rod 9 links with said regulating assembly; and
the linkage rod 10 is used for connecting the driving rod 9 and the sliding block 11;
the linkage rod 10 is of an L-shaped structure.
In this embodiment, the middle part of actuating lever 9 is connected with the flexible end of electric putter 20 in the adjusting part, and the both ends of actuating lever 9 run through the intercommunication groove 8 and are connected with gangbar 10, are convenient for show information such as characters through second clearance board 12, can drive actuating lever 9 through the mode of electric putter 20 work in the adjusting part and move in vertical direction to can drive the second clearance board 12 motion of installing on slider 11 through gangbar 10, and then realize the clearance to display screen 13 surface dust.
In summary, the working principle of the invention is as follows: the lifting component realizes the adjustment treatment of the working position of the early warning mechanism by adjusting the working height of the lifting plate 4, is convenient to meet the use requirements of different environments, thereby improving the practicability of the device, the adjusting component drives the three groups of warning boards 7 to simultaneously move outwards in a diffusion way, so that the surface of the warning board 7 and the surface of the first cleaning plate 6 are on the same circumference (as shown in figure 3), thereby being convenient for realizing the warning work of the first cleaning plate 6, the adjusting component drives the three groups of warning plates 7 to move inwards at the same time, so that the surface of the warning board 7 is on the same circumference as the inner side of the first cleaning plate 6 (as shown in figure 5), meanwhile, the mode that the rotating assembly drives the adjusting plate 16 to rotate is matched, so that friction is formed between the warning board 7 and the first cleaning plate 6, and further, the cleaning treatment of dust on the surface of the warning board 7 is realized; information such as characters are convenient to show through second cleaning board 12, and the mode of electric putter 20 work in through the adjusting part can drive actuating lever 9 and move in vertical direction to can drive the motion of second cleaning board 12 of installing on slider 11 through gangbar 10, and then realize the clearance to display screen 13 surface dust.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The utility model provides a highway construction early warning device, includes base, lifter plate and support body, the support body install in on the lifter plate, its characterized in that still includes:
the lifting assembly is arranged on the base and used for adjusting the working position of the lifting plate; and
the early warning mechanism is arranged in a space formed by the lifting plate and the frame body; the early warning mechanism comprises a first cleaning plate, a warning board and a regulating plate, wherein the first cleaning plate is arranged on the support body at least and is provided with a group, the regulating plate is in running fit with the lifting plate, the base is internally provided with a rotating assembly used for driving the regulating plate to rotate, the warning board is in sliding fit with the regulating plate and is at least provided with a group, the warning board can rotate along with the regulating plate, and the regulating plate is further provided with a regulating assembly used for driving the warning board to slide on the regulating plate.
2. The highway construction early warning device of claim 1, wherein the adjustment assembly comprises:
the guide post is arranged on the adjusting plate;
the adjusting column is of a hollow structure and is sleeved on the guide column;
the electric push rods are connected with the adjusting columns through connecting blocks and used for driving the adjusting columns to slide on the guide columns; and
at least a set of connecting rod, connecting rod one end is connected with adjusting the post rotation, and the connecting rod other end passes through the connecting seat and is connected with the warning sign.
3. The highway construction early warning device of claim 2, wherein the connecting block is in running fit with the adjusting post.
4. A road construction early warning device as claimed in claim 2, wherein the link is in running fit with the connecting seat.
5. The highway construction early warning device of claim 1, wherein the warning board and the first cleaning plate are both arc-shaped structures.
6. The highway construction early warning device of claim 1, wherein the rotating assembly comprises:
the transmission rod is of a telescopic structure and is connected with the adjusting plate; and
and the first driving motor is used for driving the transmission rod to rotate.
7. The highway construction early warning device of claim 1, wherein the lifting assembly comprises:
at least one set of lifting columns mounted on the lifting plate;
the threaded rod is rotatably arranged on the base and is in threaded connection with the lifting column;
the second driving motor is arranged in the base, and a transmission shaft is also arranged on the second driving motor; and
and the gear set is used for connecting the transmission shaft with the threaded rod.
8. The highway construction early warning device of claim 1, further comprising a display screen arranged on the frame body, wherein the frame body is further provided with a dust removal assembly for cleaning the display screen, and the dust removal assembly comprises:
the guide grooves are formed in the frame body, and the guide grooves are further provided with sliding blocks;
the second cleaning plate is arranged on the sliding block;
the communicating groove is formed in the frame body;
the driving rod is connected with the adjusting component; and
and the linkage rod is used for connecting the driving rod with the sliding block.
9. The highway construction early warning device of claim 8, wherein the linkage rod is an L-shaped structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210601899.7A CN114855666A (en) | 2022-05-30 | 2022-05-30 | Highway construction early warning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210601899.7A CN114855666A (en) | 2022-05-30 | 2022-05-30 | Highway construction early warning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114855666A true CN114855666A (en) | 2022-08-05 |
Family
ID=82641574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210601899.7A Pending CN114855666A (en) | 2022-05-30 | 2022-05-30 | Highway construction early warning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114855666A (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3905980C2 (en) * | 1988-03-14 | 1991-11-07 | Horizont Geraetewerk Gmbh, 3540 Korbach, De | |
| DE3413163C2 (en) * | 1984-04-07 | 1993-11-11 | Beilharz Kg Johannes | Barrier for traffic routes |
| JP2000028810A (en) * | 1998-07-13 | 2000-01-28 | Ttt:Kk | Installed type reflection mirror on electric pole |
| EP1156466A1 (en) * | 2000-05-18 | 2001-11-21 | Kenichi Nakajima | Road display apparatus |
| JP3490204B2 (en) * | 1996-01-31 | 2004-01-26 | 積水樹脂株式会社 | Self-cleaning gaze guide |
| NL2007167A (en) * | 2011-07-22 | 2012-02-06 | Huri Beheer B V | Signalling device for displaying warnings or traffic signs, and vehicle carrying such a signalling device. |
| CN206680895U (en) * | 2017-03-20 | 2017-11-28 | 国网山东省电力公司龙口市供电公司 | A kind of power transmission line warning plate suspension arrangement |
| CN207812328U (en) * | 2018-01-15 | 2018-09-04 | 湖南工学院 | A kind of road construction caution structure of critical field |
| JP2019049173A (en) * | 2017-09-11 | 2019-03-28 | 司 小笠原 | Traffic safety confirmation pole with cleaner |
| CN110777697A (en) * | 2019-11-12 | 2020-02-11 | 王清虎 | Hard shoulder |
| CN210244891U (en) * | 2019-10-24 | 2020-04-03 | 湖南工业职业技术学院 | Enterprise management consultation information display device |
| CN214832104U (en) * | 2021-06-15 | 2021-11-23 | 李晓明 | Warning device is used in highway maintenance construction |
| CN215164912U (en) * | 2021-07-06 | 2021-12-14 | 谭文质 | Warning sign is used in civil engineering construction |
| CN216379248U (en) * | 2021-11-17 | 2022-04-26 | 张训 | Vehicle diversion warning device for highway bridge tunnel construction |
-
2022
- 2022-05-30 CN CN202210601899.7A patent/CN114855666A/en active Pending
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|---|---|---|---|---|
| DE3413163C2 (en) * | 1984-04-07 | 1993-11-11 | Beilharz Kg Johannes | Barrier for traffic routes |
| DE3905980C2 (en) * | 1988-03-14 | 1991-11-07 | Horizont Geraetewerk Gmbh, 3540 Korbach, De | |
| JP3490204B2 (en) * | 1996-01-31 | 2004-01-26 | 積水樹脂株式会社 | Self-cleaning gaze guide |
| JP2000028810A (en) * | 1998-07-13 | 2000-01-28 | Ttt:Kk | Installed type reflection mirror on electric pole |
| EP1156466A1 (en) * | 2000-05-18 | 2001-11-21 | Kenichi Nakajima | Road display apparatus |
| NL2007167A (en) * | 2011-07-22 | 2012-02-06 | Huri Beheer B V | Signalling device for displaying warnings or traffic signs, and vehicle carrying such a signalling device. |
| CN206680895U (en) * | 2017-03-20 | 2017-11-28 | 国网山东省电力公司龙口市供电公司 | A kind of power transmission line warning plate suspension arrangement |
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| CN215164912U (en) * | 2021-07-06 | 2021-12-14 | 谭文质 | Warning sign is used in civil engineering construction |
| CN216379248U (en) * | 2021-11-17 | 2022-04-26 | 张训 | Vehicle diversion warning device for highway bridge tunnel construction |
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