CN106652780B - A kind of triangle billboard with tunable wind-guiding structure - Google Patents

A kind of triangle billboard with tunable wind-guiding structure Download PDF

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Publication number
CN106652780B
CN106652780B CN201710151682.XA CN201710151682A CN106652780B CN 106652780 B CN106652780 B CN 106652780B CN 201710151682 A CN201710151682 A CN 201710151682A CN 106652780 B CN106652780 B CN 106652780B
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China
Prior art keywords
plate
wind
frame
billboard
elastic component
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CN106652780A (en
Inventor
王艳茹
郑淑琴
符斌
朱丽
毛华庆
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Shaanxi Baili Jinhua Cultural Media Co.,Ltd.
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Wenzhou University Oujiang College
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Publication of CN106652780A publication Critical patent/CN106652780A/en
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F7/00Signs, name or number plates, letters, numerals, or symbols; Panels or boards
    • G09F7/18Means for attaching signs, plates, panels, or boards to a supporting structure
    • G09F7/22Means for attaching signs, plates, panels, or boards to a supporting structure for rotatably or swingably mounting, e.g. for boards adapted to be rotated by the wind

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Air-Flow Control Members (AREA)

Abstract

The invention discloses the triangle billboards with tunable wind-guiding structure, the plate of the billboard uses rotatable structure, plate is mounted on mounting rack securely limit and fixes under general state, the direction of triangle billboard is fixed, when certain one side or certain two sides are in face of wind, the plate of side can be opened, high wind can blow plate and enable its rotation, wind can flow away backward along gap, reduce direct impact of the high wind to billboard, the wind to flow away backward is guided exhaust outlet into from the enclosure space at rear and uniformly drained to two sides;Elastic component in enclosure space setting position-limited rack and thereon, the good limit plate of elastic component, when high wind is excessive, plate is also only capable of turning at position-limited rack and be blocked, guarantee the stability and fastness of structure, the elastic force of elastic component can fight wind-force and reset plate when wind-force reduces;The present invention can resist high wind, and good guidance wind, flexible structure is easy to disassemble, improves its fastness and stability, reduce the possibility of its damage.

Description

A kind of triangle billboard with tunable wind-guiding structure
Technical field
The present invention relates to building field more particularly to a kind of triangle billboards with tunable wind-guiding structure.
Background technique
Billboard is very common in the street, is mainly used for commercial propaganda.The pattern of billboard is varied, most commonly seen Billboard board against wall setting, the impact by wind can be hardly damaged deformation by the good support of wall;But one The billboard of kind triangle, is arranged in more spacious position mostly, watches when driving for vehicle in high speed or national highway.Triangle For billboard without other buildings as relying on, the pressure of the impact of four sides wind-engaging, receiving is larger, falls if structure is insecure It falls, will cause property loss, and be possible to hurt pedestrian or vehicle, than relatively hazardous.
Summary of the invention
It is opened the technical problems to be solved by the present invention are: providing one kind and can control advertisement plate according to wind direction difference It closes, carries out wind-guiding to reduce the triangle billboard with tunable wind-guiding structure of impact force.
In order to solve the above technical problems, the invention adopts the following technical scheme: a kind of triangle with tunable wind-guiding structure Billboard, including column, the steel structure frame being arranged on column and three pieces of billboards being arranged on steel structure frame, advertisement Plate includes mounting rack and plate, and mounting rack includes the crossbearer of upper and lower two sides and multiple vertical frames for being uniformly arranged between crossbearer, phase Plate is installed between adjacent vertical frame;Preceding divider and rear swing frame are provided in vertical frame, plate installs rear portion when between adjacent vertical frame It is limited by the rear swing frame of two sides, front is installed by preceding divider and limited;The rear of mounting rack is disposed with position-limited rack and enclosed frame, Enclosed frame and mounting rack are encircled into enclosure space and open up exhaust outlet by enclosed frame two sides, and position-limited rack is multiple groups and is set to closing Opposite with plate position in space, the front surface of position-limited rack is provided with two groups of elastic components, and two groups of elastic components correspond respectively to plate Left and right sides setting;The rear swing frame of plate two sides is rotatably arranged in vertical frame and is rotated by driving mechanisms control, root The limit to corresponding volar plate is released according to the different rear swing frames for opening plate left or right side by driving mechanism of wind direction, wind can be blown Movable plate block is rotated to the side, and wind flows to the enclosure space at rear along the gap that plate is exposed, and is discharged by exhaust outlet;Elasticity Part is supported and resets to the plate of rotation.
As an improvement the both side ends section of plate is in semicircular arc, the upper and lower surface of plate corresponds to semicircular arc Center location be provided with mounting post, what is matched on crossbearer with mounting post is provided with mounting groove, the linear section in mounting groove front, Rear portion is in the segmental arc being adapted with Plate rotating direction;Straightway of the plate by mounting post along mounting groove is installed to mounting rack On, preceding divider and rear swing frame are located at mounting groove straightway and segmental arc intersection to plate limit back mounting pole, when side back spin When frame releases the limit to corresponding volar plate, plate is rotated by axis of other side mounting post, and the mounting post of rotating side is along mounting groove Segmental arc activity.
As an improvement plate is installed on mounting rack with respect to ball bearing mechanism is provided on the outside of mounting post on plate When by ball bearing mechanism ball and crossbearer up and down support.
As an improvement plate rear surface is provided with multiple caulking grooves, the end of rear swing frame is corresponding be provided with protrude into it is embedding The grab of slot, rear swing frame leave or enter caulking groove by grab when driving mechanism drive activity.
As an improvement being provided with boss on position-limited rack and the corresponding face of plate, accommodating chamber is set on boss, is accommodated Locating rod is arranged in chamber center, and elastic component is spring part, and the both ends of elastic component are inserted into respectively in the accommodating chamber on position-limited rack and plate, It is penetrated in locating rod in the middle part of elastic component, the cavity of the accommodating chamber carries out the movement of position in truncated cone-shaped for elastic component.
As an improvement further including there are three air guiding member, each air guiding member is connected between two neighboring billboard, is sealed The exhaust outlet of closed shelves is connected in the intracorporal wind guide chamber of wind-guiding, the down-set opening air draft of wind guide chamber.
As an improvement the strut led in the opening connection one of wind guide chamber, the strut is angularly disposed and is connected to Column, strut connect one end side fluting air draft of column.
As an improvement steel structure frame includes the first steelframe group and the second steelframe group, the both ends of the first steelframe group are prolonged It stretches and is fixed at enclosed frame and column, the both ends of the second steelframe group, which extend, to be fixed at air guiding member and column.
Beneficial effect provided by the invention is: the plate of billboard uses rotatable structure, the plate under general state It is mounted on mounting rack securely limit to fix, the direction of triangle billboard is fixed, can be with when certain one side or certain two sides are in face of wind It can blow plate by automatically controlling unlatching or the artificial plate to open side, high wind and enable its rotation, wind can be suitable Gap flow away backward, reduce direct impact of the high wind to billboard, plate is unlikely to deform, be conducive to plate for a long time make With;Simple installing and dismounting mode is also beneficial to replacement plate, replaces with different advertisements;The wind to flow away backward by rear envelope It closes space and guides exhaust outlet into and uniformly drain to two sides, avoid impact of the wind to billboard back;In enclosure space, position-limited rack is set And elastic component thereon, the good limit plate of elastic component, when high wind is excessive, plate is also only capable of turning at position-limited rack and be obstructed Gear guarantees the stability and fastness of structure, and the elastic force of elastic component can fight wind-force and reset plate when wind-force reduces;The present invention Triangle billboard ensure that its stability on the whole, high wind can be resisted, good guidance wind, flexible structure is easy to disassemble, Three pieces of billboards have certain thickness using composite construction, improve its fastness and stability, and reduce its damage can Energy.
Detailed description of the invention
Fig. 1 is the schematic perspective view of triangle billboard of the present invention.
Fig. 2 is the partial cross-section structural schematic diagram of the billboard of triangle billboard of the present invention.
Fig. 3 is the enlarged view in Fig. 2 at A.
Fig. 4 is the partial cross-section structural schematic diagram after the billboard mesoplate rotation of triangle billboard of the present invention.
Fig. 5 is the partial longitudinal section structural representation in the billboard of triangle billboard of the present invention at crossbearer and plate cooperation Figure.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and detailed description.
As shown in Figs. 1-5, the embodiment of a kind of triangle billboard with tunable wind-guiding structure provided by the invention, including Column 1, the steel structure frame 2 being arranged on column 1 and three pieces of billboards 3 being arranged on steel structure frame 2, billboard 3 wrap Mounting rack 31 and plate 32 are included, mounting rack 31 includes the crossbearer 311 of upper and lower two sides and is uniformly arranged on multiple between crossbearer 311 Vertical frame 312 installs plate 32 between adjacent vertical frame 312;Preceding divider 3121 and rear swing frame 3122, plate are provided in vertical frame 312 Rear portion is limited by the rear swing frame 3122 of two sides when the installation of block 32 is between adjacent vertical frame 312, and front is installed by preceding divider 3121 and limited Position;The rear of mounting rack 31 is disposed with position-limited rack 33 and enclosed frame 34, and it is empty that enclosed frame 34 and mounting rack 31 are encircled into closing Between and by 34 two sides of enclosed frame open up exhaust outlet 341, position-limited rack 33 is multiple groups and is set in enclosure space and 32 position of plate Relatively, the front surface of position-limited rack 33 is provided with two groups of elastic components 331, and two groups of elastic components 331 correspond respectively to the left and right of plate 32 Two sides setting;The rear swing frame 3122 of 32 two sides of plate is rotatably arranged in vertical frame 312 and is rotated by driving mechanisms control, It is released according to the different rear swing frames 3122 for opening 32 left or right side of plate by driving mechanism of wind direction to corresponding volar plate 32 Limit, wind can blow plate 32 and rotate to the side, and wind flows to the enclosure space at rear along the gap that plate 32 is exposed, and passes through Exhaust outlet 341 is discharged;The plate 32 of 331 pairs of elastic component rotations is supported and resets.
The present invention as shown, use middle part column 1 structure, extend steel construction from 1 top of column to three directions Frame 2, and billboard 3 is set in 2 end of steel structure frame, three pieces of billboards 3 surround triangular structure.Billboard 3 is specific External frame body is encircled by the mounting rack 31 of front and the enclosed frame 34 at rear portion first, mounting rack 31 is subdivided into crossbearer 311 and erects Frame 312, upper lower cross frame 311 limit 32 height of plate, and multiple vertical frames 312 are separated out the width of installation plate 32;Plate 32 is installed Behind the space surrounded into crossbearer 311 and vertical frame 312, limited by the rear swing frame 3122 at rear portion from rear portion, after confirmation position is errorless Plate 32 is fixedly positioning by the preceding divider 3121 in installation front;Use, structure have such as general wall in usual cases Certain firmness sticks advertisement on plate 32 and plays the role of publicity and publicity, and divider 3121 is to plate before dismantling when replacing Block 32 is replaced, or directly replaces advertisement above in the region not being blocked, convenient and practical.When wind-force enhancing, it is Reduce direct impact of the wind to plate 32, can control the rotation of plate 32, the direction of triangle billboard is fixed, when certain one side or certain When two sides is in face of wind, the impact of the face wind rotates to carry out wind-guiding by plate 32, and driving mechanism can be servo motor, pass through Motor rotation drives rack-and-pinion movement, corresponding gear drive is arranged on rear swing frame 3122, the rotation of swing frame 3122 after realization Movement, the rear rotation of swing frame 3122 are got out of the way space after opening and are rotated for plate 32.Plate 32 can be opened not according to the difference of wind direction The control of ipsilateral carry out wind-guiding, servo motor can be by manually being controlled, by staff according to the wind direction remote opening on the same day The rear swing frame 3122 for needing to open;Can certainly be by the way that corresponding wind vane be arranged, and sensor is connected, wind direction information is anti- It feeds computer, is controlled by computer and automatic carry out on and off.The realization of position-limited rack 33 that the limit of plate 32 is arranged by rear portion, Plate 32 is resisted at rear by the elastic component 331 being arranged on position-limited rack 33, elastic component 331 can be resisted when wind-force is larger and pushes plate 32 open the gap of side in turn, distinguished and admirable rearward to drain from the exhaust outlet 341 of enclosure space two sides, alleviate wind to plate 32 Impact force;When wind is excessive, the rotation for avoiding plate 32 excessive, position-limited rack 33 stops to define turned position at rear, protects The stability and fastness of structure are demonstrate,proved, the elastic force of elastic component 331 can fight wind-force and reset plate 32 when wind-force reduces;The present invention Triangle billboard ensure that its stability on the whole, high wind can be resisted, good guidance wind, flexible structure is easy to disassemble, Three pieces of billboards have certain thickness using composite construction, improve its fastness and stability, and reduce its damage can Energy.
As an improvement specific embodiment, the both side ends section of plate 32 is in semicircular arc, plate 32 it is upper The center location that lower surface corresponds to semicircular arc is provided with mounting post 321, the setting to match on crossbearer 311 with mounting post 321 There are mounting groove 3111, the linear section in 3111 front of mounting groove, rear portion is in the segmental arc being adapted with 32 rotation direction of plate;Plate 32 are installed on mounting rack 31 by mounting post 321 along the straightway of mounting groove 3111, and preceding divider 3121 and rear swing frame 3122 are to plate Block 32 limits back mounting pole 321 and is located at 3111 straightway of mounting groove and segmental arc intersection, the releasing pair of swing frame 3122 behind side When the limit of corresponding volar plate 32, plate 32 is axis rotation with other side mounting post 321, and the mounting post 321 of rotating side is along installation The segmental arc activity of slot 3111.Plate 32 is packed by the straightway that mounting post 321 is matched to 3111 front of mounting groove, is played to plate The effect of block 32 good positioning and limit;In 32 rotary course of plate, the rotation of plate 32 can be existed by mounting post 321 The segmental arc activity of mounting groove 3111, good to define the position of plate 32, structure is more stable, the flexible not Caton of activity;Two What side end was adapted is arranged to semicircular arc, will not interfere external structure during rotation, be more advantageous to the conjunction to structure Reason setting, the part setting camber for preferably cooperating preceding divider 3121 and rear swing frame 3122 with 32 end of plate is to phase Adaptation, structure is more stable securely, and left and right restricts more preferable;One end as axis can preferably match periphery in rotation.
As an improvement specific embodiment, the outside on plate 32 with respect to mounting post 321 is provided with ball bearing mechanism 322, it is supported by the ball in ball bearing mechanism 322 with about 311 crossbearer when plate 32 is installed on mounting rack 31.Specifically in plate A slot is opened up on block 32, ball bearing mechanism 322 is arranged in the space of filling slot in slot, and ball bearing mechanism 322 can be by shell two Plate body synthesis of the piece with cavity, cavity accommodate ball, and ball a part is exposed to outside plate body, this be partially toward upside or under Side supports on crossbearer 311 above and below ball after plate 32 is mounted on mounting rack 31, can make plate 32 installing and dismounting, Rotation resets more smooth light.
As an improvement specific embodiment, 32 rear surface of plate is provided with multiple caulking grooves 323, rear swing frame 3122 End is corresponding to be provided with the grab 3123 for protruding into caulking groove 323, and rear swing frame 3122 is by grab 3123 when driving mechanism drive activity Leave or enter caulking groove 323.Further setting caulking groove 323 and grab 3123, can the good opposite position for limiting plate 32 It sets, caulking groove 323 is navigated to by grab 3123, guarantee reset of the plate 32 when not having wind in place;What is optimized can be by caulking groove 323 Camber is arranged in trough rim, and grab 3123 can smoothly enter into embedding from the trough rim of arc when driving return by servo motor for rear swing frame 3122 Slot 323.
As an improvement specific embodiment, be provided with boss 4 on position-limited rack 33 and the corresponding face of plate 32, it is convex Accommodating chamber 5 is set on platform 4, and locating rod 6 is arranged in 5 center of accommodating chamber, and elastic component 331 is spring part, and the both ends of elastic component 331 are distinguished It is inserted into the accommodating chamber 5 on position-limited rack 33 and plate 32, is penetrated in the middle part of elastic component 331 in locating rod 6, the cavity of the accommodating chamber 5 The movement of position is carried out for elastic component 331 in truncated cone-shaped.The middle part after being installed in place of elastic component 331 is limited by locating rod 6 to keep It is stablized, and periphery is limited by accommodating chamber 5;During rotation, the accommodating chamber 5 of two sides can generate bias, elastic component 331 to plate 32 Twisting can be generated during compression accordingly, the accommodating chamber 5 of truncated cone-shaped cavity enables the end of elastic component 331 can be corresponding It is biased to a side of truncated cone-shaped cavity, is being rotated to adapt to plate 32, elastic component 331 preferably compression and reset are enabled.Simultaneously The elastic component 331 of the structure can cooperate the structure of caulking groove 323 and grab 3123 to guarantee the parking position accuracy of plate 32.
As an improvement specific embodiment, further include there are three air guiding member 7, each air guiding member 7 is connected to adjacent Between two billboards 3, the exhaust outlet 341 of enclosed frame 34 is connected in the wind guide chamber 71 in air guiding member 7, and wind guide chamber 71 is to dividing into Set 72 air drafts of opening.Realize that air guiding member 7 cooperates with billboard 3 by air guiding member 7 in the coupling part two-by-two of three billboards 3 After installation, the wind guide chamber 71 of air guiding member 7 leads to exhaust outlet 341, the wind that two sides billboard 3 can be received to lead, and passes through Be open 72 downward air drafts, can avoid interfering with each other existing for air draft, and wind is buffered in wind guide chamber 71, can be dropped significantly The wind of low impact force, discharge is softer.
As an improvement specific embodiment, wind guide chamber 71 opening 72 connection one in lead to strut 8, the strut 8 The angularly disposed and column 1 that is connected to, strut 8 connect one end side fluting air draft of column 1.On the one hand setting strut 8 rises To the effect for reinforcing air guiding member 7, angularly disposed good support air guiding member 7, and wind is led further into the mistake near column 1 Cheng Zhong, wind-force further weaken, and are discharged near column 1, will not interfere and influence anyone neighbouring normal work with things It is dynamic.
As an improvement specific embodiment, steel structure frame 2 include the first steelframe group 21 and the second steelframe group 22, The both ends of first steelframe group 21, which extend, to be fixed at enclosed frame 34 and column 1, and the both ends of the second steelframe group 22, which extend to be fixed on, leads At wind body 7 and column 1.Enclosed frame 34 is connected at the connection structure of diverging by the first steelframe group 21 and 22 cloth of the second steelframe group At air guiding member 7, the weight of good support billboard 3 and air guiding member 7.

Claims (8)

1. a kind of triangle billboard with tunable wind-guiding structure, including column (1), the steel construction frame being arranged on column (1) Frame (2) and three pieces of billboards (3) being arranged on steel structure frame (2), it is characterised in that: the billboard (3) includes installation Frame (31) and plate (32), the mounting rack (31) include the crossbearer (311) of upper and lower two sides and be uniformly arranged on crossbearer (311) it Between multiple vertical frames (312), plate (32) are installed between adjacent vertical frame (312);Preceding divider is provided on the vertical frame (312) (3121) and rear swing frame (3122) when, plate (32) installation is between adjacent vertical frame (312) rear portion by two sides rear swing frame (3122) it limits, front is installed by preceding divider (3121) and limited;The rear of the mounting rack (31) is disposed with position-limited rack (33) it is encircled into enclosure space with enclosed frame (34), the enclosed frame (34) and mounting rack (31) and is opened by enclosed frame (34) two sides If exhaust outlet (341), the position-limited rack (33) is multiple groups and is set in enclosure space, the limit opposite with plate (32) position The front surface of position frame (33) is provided with two groups of elastic components (331), and elastic component described in two groups (331) corresponds respectively to plate (32) Left and right sides setting;The rear swing frame (3122) of plate (32) two sides is rotatably arranged on vertical frame (312) and by driving machine Structure control rotation, according to different rear swing frames (3122) releasings pair for opening plate (32) left or right side by driving mechanism of wind direction The limit of corresponding volar plate (32), wind can blow plate (32) and rotate to the side, and wind is flowed to along the gap that plate (32) is exposed The enclosure space at rear, and be discharged by exhaust outlet (341);The elastic component (331) is supported the plate (32) of rotation And reset.
2. a kind of triangle billboard with tunable wind-guiding structure according to claim 1, it is characterised in that: the plate (32) both side ends section is in semicircular arc, and the upper and lower surface of plate (32) corresponds to the center location setting of the semicircular arc Have mounting post (321), what is matched on the crossbearer (311) with mounting post (321) is provided with mounting groove (3111), the installation The linear section in slot (3111) front, rear portion are in the segmental arc being adapted with plate (32) rotation direction;The plate (32) is by pacifying Dress column (321) is installed on mounting rack (31) along the straightway of mounting groove (3111), preceding divider (3121) and rear swing frame (3122) Mounting groove (3111) straightway and segmental arc intersection, swing frame behind side are located to plate (32) limit back mounting pole (321) (3122) when releasing the limit to corresponding volar plate (32), plate (32) is axis rotation, rotating side with other side mounting post (321) Mounting post (321) along mounting groove (3111) segmental arc activity.
3. a kind of triangle billboard with tunable wind-guiding structure according to claim 2, it is characterised in that: the plate (32) with respect to being provided with ball bearing mechanism (322) on the outside of mounting post (321) on, when plate (32) is installed on mounting rack (31) by Ball in ball bearing mechanism (322) is supported up and down with crossbearer (311).
4. a kind of triangle billboard with tunable wind-guiding structure according to claim 1 or 2 or 3, it is characterised in that: institute Plate (32) rear surface is stated to be provided with multiple caulking grooves (323), it is described after swing frame (3122) end it is corresponding be provided with protrude into it is embedding The grab (3123) of slot (323), rear swing frame (3122) leave or enter caulking groove by grab (3123) when driving mechanism drive activity (323)。
5. a kind of triangle billboard with tunable wind-guiding structure according to claim 1 or 2 or 3, it is characterised in that: institute It states and is provided with boss (4) on position-limited rack (33) and the corresponding face of plate (32), accommodating chamber (5) are set on the boss (4), institute Accommodating chamber (5) center setting locating rod (6) is stated, the elastic component (331) is spring part, and the both ends of elastic component (331) are inserted respectively Enter in the accommodating chamber (5) on position-limited rack (33) and plate (32), is penetrated in locating rod (6) in the middle part of elastic component (331), the accommodating chamber (5) cavity carries out the movement of position in truncated cone-shaped for elastic component (331).
6. a kind of triangle billboard with tunable wind-guiding structure according to claim 1 or 2 or 3, it is characterised in that: also Including there are three air guiding member (7), each air guiding member (7) is connected between two neighboring billboard (3), the enclosed frame (34) exhaust outlet (341) is connected in the wind guide chamber (71) in air guiding member (7), the down-set opening of the wind guide chamber (71) (72) air draft.
7. a kind of triangle billboard with tunable wind-guiding structure according to claim 6, it is characterised in that: the wind-guiding The strut (8) led in opening (72) connection one of chamber (71), the strut (8) is angularly disposed and the column that is connected to (1), strut (8) one end side fluting air draft of column (1) is connected.
8. a kind of triangle billboard with tunable wind-guiding structure according to claim 7, it is characterised in that: the steel knot Structure frame (2) includes the first steelframe group (21) and the second steelframe group (22), and the both ends of the first steelframe group (21), which extend, to be fixed At enclosed frame (34) and column (1), the both ends of the second steelframe group (22), which extend, is fixed on air guiding member (7) and column (1) Place.
CN201710151682.XA 2017-03-15 2017-03-15 A kind of triangle billboard with tunable wind-guiding structure Active CN106652780B (en)

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CN108962072B (en) * 2018-07-27 2021-07-30 深圳市南硕明泰科技有限公司 Advertisement frame
CN108766308A (en) * 2018-08-03 2018-11-06 绵阳鹏志远科技有限公司 curved screen windproof advertising board device
CN113160721B (en) * 2021-03-25 2022-09-09 湖南视路美文化传播有限责任公司 Large wind-resistant advertising board
CN113160722B (en) * 2021-03-25 2022-08-26 河南职业技术学院 Large-scale bill-board in high altitude

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CN201233702Y (en) * 2008-07-25 2009-05-06 许培元 Wind resistant advertisement board
EP2705512B1 (en) * 2011-05-05 2015-03-04 Aluart AG Suspension device with extension arm for flags
CN102568346A (en) * 2011-12-02 2012-07-11 东南大学 Strong-wind resistant billboard
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