CN112669733A - Self-adaptive folding wind-resistant billboard - Google Patents
Self-adaptive folding wind-resistant billboard Download PDFInfo
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- CN112669733A CN112669733A CN202011593157.1A CN202011593157A CN112669733A CN 112669733 A CN112669733 A CN 112669733A CN 202011593157 A CN202011593157 A CN 202011593157A CN 112669733 A CN112669733 A CN 112669733A
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- 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
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a self-adaptive folding wind-resistant billboard. The existing windproof billboard has complex process or low operability. The invention comprises an outer frame of a billboard, a movable frame component, a ratchet bar, a connecting rope, an advertisement blade component and a cam mechanism; the two movable frame assemblies are hinged through the supporting polished rod and can be folded and unfolded in a separated manner in the outer frame of the billboard; the connecting rope is connected with the supporting polished rod and the ratchet bar; the advertising blade assembly acts with the ratchet bar through the top bead on the cam mechanism. The ratchet strip of the invention ascends in a first-level mode, the folding speed of the two movable frame assemblies is slow, and the possibility of damage of the movable frame assemblies under strong wind is reduced; when the advertisement blade is subjected to enough wind power, the force applied to the ratchet strip by the top bead enables the ratchet strip not to rise any more; therefore, the two movable frame assemblies automatically correspond to different wind powers and are folded at different angles; when wind power is reduced, the reset is automatically realized through the weight, the ratchets descend in the first-level mode, the two movable frame assemblies are unfolded back to the outer frame of the billboard, and the impact is small.
Description
Technical Field
The invention belongs to the technical field of billboards, and particularly relates to a self-adaptive folding wind-resistant billboard.
Background
The billboard is one of the more widely applied media on the existing expressway, and plays a very important role in the economic construction of China with the advantages of low cost and large captions along with the continuous extension of the expressway. However, in a wide plain area, the billboard is easily damaged by strong wind such as typhoon and hurricane, which causes serious personnel and property loss. The existing windproof billboard is not complex in manufacturing process and high in manufacturing cost (such as an 'automatic windproof billboard' in application No. 200720102999.6) or is simple in manufacturing, but has poor operability and needs manpower assistance (such as the 'windproof billboard' in application No. 98216426.2).
In order to solve the problems of complex process, poor operability and the like, the advertising board capable of automatically rotating to resist wind power is designed, which is particularly important, not only can improve the wind resistance of the advertising board in typhoon and hurricane weather, but also can liberate labor force, and compared with manpower assistance, the autonomous wind-resistant advertising board has more acute autonomous adjusting capability and random strain capability, and in addition, the advertising board has a simple structure, does not need too much complex maintenance trouble, and reduces the consumption of manpower.
Disclosure of Invention
The invention aims to provide a self-adaptive folding wind-resistant billboard aiming at the defects in the prior art, which can be automatically folded under the condition of wind, reduce the wind resistance and restore the original shape of the billboard under the condition of no wind.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a self-adaptive folding wind-resistant advertising board, which comprises a rack, a stand column, an outer frame of the advertising board, a movable frame assembly, a supporting polished rod, an optical axis, a ratchet strip, a connecting rope, an advertising blade assembly and a cam mechanism, wherein the stand column is arranged on the rack; the movable frame assembly comprises a movable frame, an inner frame rotating shaft, a first sliding block and a sliding rail; the inner frame rotating shaft is fixed with the movable frame; two ends of the inner frame rotating shaft extend out of the movable frame and are respectively hinged with a first sliding block; the two first sliding blocks and the two sliding rails respectively form sliding pairs; the two slide rails are respectively arranged at the top and the bottom of the outer frame of the billboard; both ends of the sliding rail are fixed with the outer frame of the billboard through the support; the outer frame of the billboard is fixed on the top of the frame; the top and the bottom of one end of the movable frame of one movable frame assembly are both fixed with a first connecting plate, and the top and the bottom of one end of the movable frame of the other movable frame assembly are both fixed with a second connecting plate; the first connecting plate and the second connecting plate at the top are hinged through the top of the support polished rod, and the first connecting plate and the second connecting plate at the bottom are hinged through the bottom of the support polished rod.
The two support shafts are arranged at intervals up and down and are fixed on the frame through the L-shaped plate; the two upright columns are horizontally arranged at intervals and are fixed with the two support shafts; the tops of the two stand columns are respectively fixed with two ends of one guide shaft, and the bottoms of the two stand columns are respectively fixed with two ends of the other guide shaft; each guide shaft and the two rollers arranged at intervals form a revolute pair; the optical axis is vertically arranged, and two ends of the optical axis are fixed with the two stand columns through connecting frames; the second sliding block and the optical axis form a cylindrical pair; the ratchet bar is fixed on the second sliding block and forms a rolling friction pair with the four rollers on the two guide shafts; the tooth socket of the ratchet bar faces downwards; two ends of the connecting rope are respectively fixed with the top end of the ratchet strip and the supporting polished rod, and a heavy object is fixed at the bottom end of the ratchet strip. The advertisement blade assembly comprises an advertisement blade, a rotating shaft and a connecting piece; the middle part of the connecting piece is fixed with the rotating shaft; the advertisement blade is fixed with the outer end of the connecting piece; the advertisement blade subassembly is equipped with two, and one of them advertisement blade subassembly's pivot both ends and two L templates of two back shaft one ends constitute the revolute pair respectively, and another advertisement blade subassembly's pivot both ends and two L templates of two back shaft other ends constitute the revolute pair respectively. The cam mechanism comprises a cam, a push rod guide rail, a spring and a top ball; the cam is an end face cam only with a push stroke section, and a flat plate integrally formed with one end of the push rod forms a cam pair; the push rod and the push rod guide rail form a sliding pair vertical to the optical axis direction; the spring is sleeved on the push rod, and two ends of the spring are respectively fixed with the flat plate on the push rod and the end face of the push rod guide rail; the top bead is fixed at the other end of the push rod; the two cam mechanisms are arranged, and the cams of the two cam mechanisms are respectively fixed with the inner ends of the connecting pieces of the two advertisement blade assemblies; the push rod guide rails of the two cam mechanisms are respectively fixed with the two upright posts; one end of the push rod of each cam mechanism, which is fixed with the top bead, penetrates into the corresponding upright post respectively, and the top beads of the two cam mechanisms are embedded into one tooth groove on the corresponding side of the ratchet bar respectively.
Preferably, two ends of the inner frame rotating shaft are respectively matched with an inner ring of one bearing I, and outer rings of the two bearing I are respectively matched with one bearing seat I; and the first bearing block is fixed with the corresponding slide block.
Preferably, the bottom of the frame is fixed with the chassis.
Preferably, the polish rod seat is fixed on the top connecting plate I and the bottom connecting plate II, and the support polish rod penetrates through the central holes of the two polish rod seats.
Preferably, both ends of the supporting polished rod extend out of the first connecting plate and the second connecting plate and are supported on the second bearing block through the second bearing; the second bearing block at the top is fixed with the second connecting plate, and the second bearing block at the bottom is fixed with the first connecting plate.
Preferably, the rotating shaft and the L-shaped plate form a rotating pair through a bearing III.
The invention has the following beneficial effects:
(1) when the movable frame assemblies are acted by strong wind, the two movable frame assemblies can be folded and unfolded in a separated manner in the outer frame of the billboard, and the folding angle is limited in a certain range, so that the damage of the overlarge folding angle to the outer frame of the billboard is prevented; the ratchet bars can only ascend in a first-level mode, the ascending speed is greatly reduced, and the ratchet bars cannot descend, so that the folding speed of the two movable frame assemblies cannot be fast, the movable frame assemblies are protected, and the possibility that the movable frame assemblies are damaged under strong wind power is reduced; in addition, when the advertisement blade is subjected to enough wind power, the force applied to the ratchet strip by the top bead enables the ratchet strip not to rise any more, and the folding angles of the two movable frame components are fixed and unchanged; therefore, the invention can realize that the top bead is embedded in different tooth sockets of the ratchet strip and the two movable frame components are folded at different angles under the condition of all wind gears, thereby automatically coping with different wind forces and reducing the influence of the wind force.
(2) When wind power is reduced, the invention automatically realizes reset through a heavy object, the ratchets descend one level at a time, the descending speed is greatly reduced, and the two movable frame assemblies are driven to expand back to the outer frame of the billboard through the connecting rope; therefore, the unfolding speed of the two movable frame assemblies cannot be high, and the impact on the two movable frame assemblies is small.
(3) The invention has simple and ingenious structure and stable stress, adopts the modular design of the movable frame assembly, is flexible in folding and unfolding, and is easy for field assembly, adjustment and maintenance.
(4) The invention reduces the possibility of damaging the billboard caused by wind disaster, and avoids unnecessary casualties and property loss; the advertising board can be used for a long time after being installed once, and the replacement period of the advertising board is shortened; the support frame structure of the billboard is reduced, and the cost of the billboard is reduced; the advertising effect is enhanced, one billboard is multi-purpose, and a plurality of billboards can be attached to one billboard frame.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an assembled perspective view of the outer frame and the movable frame assembly of the billboard of the present invention;
FIG. 3 is a top view of FIG. 1;
FIG. 4 is a schematic view of the assembly of the ratchet and cam mechanism of the present invention;
FIG. 5 is an assembled perspective view of the advertising blade assembly, ratchet bar and cam mechanism of the present invention;
1. a frame; 2. a column; 3. a ratchet bar; 4. a bolt; 5. a spring; 6. a connecting member; 7. a support shaft; 8. a first bearing; 9. a first bearing seat; 10. a second bearing; 11. a second bearing seat; 12. a polished rod base; 13. supporting the polish rod; 14. a push rod guide rail; 15. an advertising leaf; 16. a nut; 17. a movable frame; 18. an inner frame rotating shaft; 19. a chassis; 20. a support; 21. an outer frame of the billboard; 22. a first sliding block; 23. a first connecting plate; 24. a second connecting plate; 25. a slide rail; 26. a third bearing; 27. a cam mechanism; 28. a push rod; 29. a rotating shaft; 30. a top bead; 31. a connecting rope; 32. a second sliding block; 33. an optical axis; 34. a guide shaft; 35. a roller.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings. The following examples or drawings are merely illustrative of the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, 2 and 3, the adaptive folding wind-resistant billboard comprises a frame 1, a chassis 19, a column 2, a billboard outer frame 21, a movable frame assembly, a supporting polished rod 13, an optical axis 33, a ratchet strip 3, a connecting rope 31, a billboard blade assembly and a cam mechanism 27; the movable frame assembly comprises a movable frame 17, an inner frame rotating shaft 18, a first sliding block 22 and a sliding rail 25; the inner frame rotating shaft 18 is fixed with the movable frame 17; two ends of the inner frame rotating shaft 18 extend out of the movable frame 17 and are respectively hinged with a first sliding block 22; the two first sliding blocks 22 and the two sliding rails 25 respectively form sliding pairs; the two slide rails 25 are respectively arranged at the top and the bottom of the outer frame 21 of the billboard; two ends of the slide rail 25 are fixed with the outer frame 21 of the billboard through the support 20; the outer frame 21 of the billboard is fixed on the top of the frame 1; the bottom of the frame 1 is fixed with a chassis 19; the two movable frame assemblies are arranged, wherein a first connecting plate 23 is fixed to the top and the bottom of one end of the movable frame 17 of one movable frame assembly, and a second connecting plate 24 is fixed to the top and the bottom of one end of the movable frame 17 of the other movable frame assembly; the first connecting plate 23 and the second connecting plate 24 at the top are hinged through the top of the supporting polished rod 13, and the first connecting plate 23 and the second connecting plate 24 at the bottom are hinged through the bottom of the supporting polished rod 13.
As shown in fig. 1, 4 and 5, two support shafts 7 are arranged at intervals up and down and are fixed on the frame 1 through an L-shaped plate; the two upright posts 2 are arranged at a horizontal interval, and the upright posts 2 and the two support shafts 7 are fixed; the tops of the two upright columns 2 are respectively fixed with two ends of one guide shaft 34, and the bottoms of the two upright columns 2 are respectively fixed with two ends of the other guide shaft 34; each guide shaft 34 and two rollers 35 arranged at intervals form a revolute pair; the optical axis 33 is vertically arranged, and two ends of the optical axis are fixed with the two upright posts 2 through connecting frames; the second sliding block 32 and the optical axis 33 form a cylindrical pair; the ratchet 3 is fixed on the second sliding block 32 and forms a rolling friction pair with the four rollers 35 on the two guide shafts 34, so that the ratchet 3 is prevented from rotating around the optical axis 33 when sliding on the optical axis; the tooth grooves of the ratchet bars 3 face downwards; two ends of the connecting rope 31 are respectively fixed with the top end of the ratchet strip 3 and the supporting polished rod 13, and the bottom end of the ratchet strip 3 is fixed with a heavy object. The advertising blade assembly comprises an advertising blade 15, a rotating shaft 29 and a connecting piece 6; the connecting piece 6 is fixed with the rotating shaft 29; the advertisement blade 15 is fixed with the outer end of the connecting piece 6 through a bolt 4 and a nut 16; the advertisement blade assemblies are provided with two advertisement blade assemblies, wherein two ends of a rotating shaft 29 of one advertisement blade assembly and two L-shaped plates at one ends of the two supporting shafts 7 respectively form revolute pairs, and two ends of a rotating shaft 29 of the other advertisement blade assembly and two L-shaped plates at the other ends of the two supporting shafts 7 respectively form revolute pairs. The cam mechanism 27 comprises a cam, a push rod 28, a push rod guide rail 14, a spring 5 and a top ball 30; the cam is an end face cam only with a push stroke section, and a flat plate integrally formed with one end of the push rod 28 forms a cam pair; the push rod 28 and the push rod guide rail 14 form a sliding pair along the direction vertical to the optical axis 33; the spring 5 is sleeved on the push rod 28, and two ends of the spring 5 are respectively fixed with the flat plate on the push rod 28 and the end face of the push rod guide rail 14; the top bead 30 is fixed at the other end of the push rod 28; the number of the cam mechanisms 27 is two, and the cams of the two cam mechanisms 27 are respectively fixed with the inner ends of the connecting pieces 6 of the two advertisement blade assemblies; the push rod guide rails 14 of the two cam mechanisms 27 are respectively fixed with the two upright posts 2; one end of the push rod 28 of each cam mechanism 27, which is fixed with the top bead 30, penetrates into one corresponding upright post 2, and the top beads 30 of each cam mechanism 27 are embedded into one tooth groove of the corresponding side of the ratchet 3.
As a preferred embodiment, two ends of the inner frame rotating shaft 18 are respectively matched with the inner ring of one bearing I8, and the outer rings of the two bearings I8 are respectively matched with one bearing seat I9; the two bearing blocks I9 are fixed with one corresponding slide block 22.
As a preferred embodiment, the polish rod bases 12 are fixed on the top connecting plate 23 and the bottom connecting plate 24, and the polish rod 13 is supported through the central holes of the two polish rod bases 12.
As a preferred embodiment, in order to enhance the rotation flexibility of the supporting polished rod, both ends of the supporting polished rod 13 extend out of the first connecting plate 23 and the second connecting plate 24, and are supported on the second bearing seat 11 through the second bearing 10; the second bearing seat 11 at the top is fixed with the second connecting plate 24, and the second bearing seat 11 at the bottom is fixed with the first connecting plate 23.
In a preferred embodiment, the rotating shaft 29 and the L-shaped plate form a rotating pair through a bearing III 26.
This anti-wind bill-board is folded to self-adaptation type, theory of operation as follows:
in a windy environment, the movable frames 17 of the two movable frame assemblies rotate around the respective inner frame rotating shafts 18, and the two movable frame assemblies are hinged through the supporting polished rods 13, so that the first sliding blocks 22 can be driven to slide along the sliding rails 25 in the rotating process of the movable frames 17 of the two movable frame assemblies, and the two movable frame assemblies can be separately folded and unfolded in the outer frame 21 of the billboard; the folding angles of the two movable frame components are limited within a certain range by the length of the sliding rail 25, so that the damage of the overlarge folding angle to the outer frame of the billboard is prevented. When the two movable frame assemblies are folded, the connecting rope 31 drives the ratchet strips 3 to move upwards along the optical axis 33, but the top beads 30 are embedded into the tooth grooves of the ratchet strips 3, so that the ratchet strips can only ascend in a first-level and first-level manner, the ascending speed is greatly reduced, and the ratchet strips cannot descend, the folding speed of the two movable frame assemblies cannot be fast, the effect of protecting the movable frame assemblies is achieved, and the possibility that the movable frame assemblies are damaged under strong wind power is reduced; in addition, the advertisement blade 15 rotates under the action of wind force, and the cam is driven to rotate by the connecting piece 6; the cam pushes the push rod 28 to slide inwards along the push rod guide rail 14, when the wind power applied to the advertisement blade 15 is increased to the extent that the friction force generated by the force applied by the top bead 30 to the ratchet strip 3 is greater than the driving force F1, the ratchet strip 3 does not rise any more, and the folding angle of the two movable frame components is fixed; wherein, the driving force F1 is the resultant of the pulling force of the connecting rope 31 on the ratchet 3 and the total gravity of the ratchet 3 and the weight. Therefore, the invention can realize that the top bead 30 is embedded in different tooth sockets of the ratchet strip 3 and the two movable frame components are folded at different angles under various wind resistance conditions, thereby automatically coping with different wind forces and reducing the influence of the wind force.
When the wind force is reduced, the rotation angle of the advertisement blade 15 is reduced, the push rod 28 slides outwards along the push rod guide rail 14 under the restoring force of the spring 5, and the force applied by the top bead 30 to the ratchet 3 is reduced; when the force applied by the top bead 30 to the ratchet 3 is reduced to the point that the weight of the ratchet 3 is greater than the resistance F2, the teeth of the ratchet 3 apply pressure to the top bead 30, so that the push rod rail 14 slides further outwards; when the tooth grooves of the ratchet strips 3 cross the top beads 30, the top beads 30 are embedded into the tooth grooves of a higher level of the ratchet strips 3, so that the ratchet strips 3 descend by one level, the descending speed is greatly reduced, and the two movable frame assemblies are driven by the connecting rope 31 to be unfolded back to the outer frame 21 of the billboard; wherein, the resistance F2 is the resultant force of the pulling force of the connecting rope 31 on the ratchet 3 and the friction force of the top bead 30 and the tooth socket of the ratchet 3. Therefore, the unfolding speed of the two movable frame assemblies cannot be high, and the impact on the two movable frame assemblies is small.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (6)
1. Folding anti-wind bill-board of self-adaptation type, frame, its characterized in that outside frame including frame, stand and bill-board: the device also comprises a movable frame assembly, a supporting polished rod, an optical axis, a ratchet bar, a connecting rope, an advertisement blade assembly and a cam mechanism; the movable frame assembly comprises a movable frame, an inner frame rotating shaft, a first sliding block and a sliding rail; the inner frame rotating shaft is fixed with the movable frame; two ends of the inner frame rotating shaft extend out of the movable frame and are respectively hinged with a first sliding block; the two first sliding blocks and the two sliding rails respectively form sliding pairs; the two slide rails are respectively arranged at the top and the bottom of the outer frame of the billboard; both ends of the sliding rail are fixed with the outer frame of the billboard through the support; the outer frame of the billboard is fixed on the top of the frame; the top and the bottom of one end of the movable frame of one movable frame assembly are both fixed with a first connecting plate, and the top and the bottom of one end of the movable frame of the other movable frame assembly are both fixed with a second connecting plate; the first connecting plate and the second connecting plate at the top are hinged through the top of the supporting polished rod, and the first connecting plate and the second connecting plate at the bottom are hinged through the bottom of the supporting polished rod;
the two support shafts are arranged at intervals up and down and are fixed on the frame through the L-shaped plate; the two upright columns are horizontally arranged at intervals and are fixed with the two support shafts; the tops of the two stand columns are respectively fixed with two ends of one guide shaft, and the bottoms of the two stand columns are respectively fixed with two ends of the other guide shaft; each guide shaft and the two rollers arranged at intervals form a revolute pair; the optical axis is vertically arranged, and two ends of the optical axis are fixed with the two stand columns through connecting frames; the second sliding block and the optical axis form a cylindrical pair; the ratchet bar is fixed on the second sliding block and forms a rolling friction pair with the four rollers on the two guide shafts; the tooth socket of the ratchet bar faces downwards; two ends of the connecting rope are respectively fixed with the top end of the ratchet strip and the supporting polished rod, and a heavy object is fixed at the bottom end of the ratchet strip; the advertisement blade assembly comprises an advertisement blade, a rotating shaft and a connecting piece; the middle part of the connecting piece is fixed with the rotating shaft; the advertisement blade is fixed with the outer end of the connecting piece; two advertisement blade assemblies are arranged, wherein two ends of a rotating shaft of one advertisement blade assembly and two L-shaped plates at one ends of the two support shafts respectively form revolute pairs, and two ends of the rotating shaft of the other advertisement blade assembly and two L-shaped plates at the other ends of the two support shafts respectively form revolute pairs; the cam mechanism comprises a cam, a push rod guide rail, a spring and a top ball; the cam is an end face cam only with a push stroke section, and a flat plate integrally formed with one end of the push rod forms a cam pair; the push rod and the push rod guide rail form a sliding pair vertical to the optical axis direction; the spring is sleeved on the push rod, and two ends of the spring are respectively fixed with the flat plate on the push rod and the end face of the push rod guide rail; the top bead is fixed at the other end of the push rod; the two cam mechanisms are arranged, and the cams of the two cam mechanisms are respectively fixed with the inner ends of the connecting pieces of the two advertisement blade assemblies; the push rod guide rails of the two cam mechanisms are respectively fixed with the two upright posts; one end of the push rod of each cam mechanism, which is fixed with the top bead, penetrates into the corresponding upright post respectively, and the top beads of the two cam mechanisms are embedded into one tooth groove on the corresponding side of the ratchet bar respectively.
2. The adaptive folding wind-resistant billboard of claim 1, characterized in that: two ends of the inner frame rotating shaft are respectively matched with an inner ring of one bearing I, and outer rings of the two bearing I are respectively matched with one bearing seat I; and the first bearing block is fixed with the corresponding slide block.
3. The adaptive folding wind-resistant billboard of claim 1, characterized in that: the bottom of the frame is fixed with the chassis.
4. The adaptive folding wind-resistant billboard of claim 1, characterized in that: and the polish rod seats are fixed on the connecting plate I at the top and the connecting plate II at the bottom, and the support polish rod penetrates through the central holes of the two polish rod seats.
5. The adaptive folding wind-resistant billboard of claim 1, characterized in that: two ends of the supporting polished rod extend out of the first connecting plate and the second connecting plate and are supported on the second bearing block through the second bearing; the second bearing block at the top is fixed with the second connecting plate, and the second bearing block at the bottom is fixed with the first connecting plate.
6. The adaptive folding wind-resistant billboard of claim 1, characterized in that: and the rotating shaft and the L-shaped plate form a revolute pair through a bearing III.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011593157.1A CN112669733B (en) | 2020-12-29 | 2020-12-29 | Self-adaptive folding wind-resistant billboard |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011593157.1A CN112669733B (en) | 2020-12-29 | 2020-12-29 | Self-adaptive folding wind-resistant billboard |
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| CN112669733A true CN112669733A (en) | 2021-04-16 |
| CN112669733B CN112669733B (en) | 2023-03-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115418989A (en) * | 2022-10-08 | 2022-12-02 | 交通运输部公路科学研究所 | Can reduce wind load and elasticity from traffic sign plate structure that restores to throne |
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| CN115418989A (en) * | 2022-10-08 | 2022-12-02 | 交通运输部公路科学研究所 | Can reduce wind load and elasticity from traffic sign plate structure that restores to throne |
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