Safety warning device for road construction site

Abstract

The invention discloses a safety warning device for a road construction site, and relates to the technical field of road construction, the safety warning device comprises two support frames and a warning plate; the warning plate is a parallelogram plate and comprises two inclined side faces and four flat side faces, rotating shafts are fixed to the two flat side faces, close to the supporting frames, of the warning plate respectively, and the unoccupied end of one rotating shaft is rotationally connected with one supporting frame. A direct-current brushless motor is fixed to the side, away from the warning panel, of one supporting frame, and the direct-current brushless motor is used for driving the warning panel to rotate. Display panels are fixed to the middles of the two inclined side faces of the warning board respectively, and the display panels are used for displaying graphs and characters; flash plates are respectively fixed on the edges of the two inclined side surfaces of the warning plate; according to the invention, road construction in front of vehicles can be reminded, clearly moving objects are easier to identify and position than fuzzy static light spots, the warning effect is enhanced, and thus the personal safety of constructors is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of road construction, and particularly relates to a safety warning device for a road construction site. BACKGROUND

[0002] A road construction site is a high-risk area, and a safety warning device is the first line of defense for protecting the safety of construction personnel and road users. A reflective warning sign is usually placed on a construction road to warn passing vehicles. However, due to the complex and diverse environment of road construction, when the road construction is in a low-contrast environment with drought and dust, the visibility is significantly reduced. The reflective warning sign needs external light source to reflect light. If the vehicle does not turn on the high beam or the high beam is damaged, the reflective warning sign will be useless. Even if a static or simple flashing light source is used for warning, it will be filtered out by the driver's brain in a monotonous and empty environment. Therefore, a fuzzy static light point is also not easy to be identified and positioned, thereby threatening the personal safety of construction personnel and reducing the efficiency of road construction.

[0003] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be taken as admitting that such information in the prior art. SUMMARY

[0004] The present application aims to provide a safety warning device for a road construction site, which can solve the problem of fuzzy static light points not being easy to be identified and positioned, threatening the personal safety of construction personnel, and reducing the efficiency of road construction.

[0005] To achieve the above-mentioned purpose, the technical solution provided by one embodiment of the present application is as follows: A safety warning device for a road construction site, comprising a support frame and a warning board, the support frame has two; The warning board is a parallelogram board and includes two inclined sides and four flat sides. The two flat sides of the warning board close to the support frame are respectively fixed with a rotating shaft. The free end of one rotating shaft is rotatably connected with one support frame. One of the support frames is fixed with a DC brushless motor on the side away from the warning board. The DC brushless motor is used to drive the rotating movement of the warning board. The middle part of the two inclined sides of the warning board is respectively fixed with a display panel. The display panel is used to display graphics and text. The edge of the two inclined sides of the warning board is respectively fixed with a flashing board. The flashing board is an amber LED light board in the shape of a quadrilateral frame, and the wavelength is about 590nm.

[0006] In one or more embodiments of the present application, the rotating speed of the warning board is between 45r / min and 75r / min.

[0007] In one or more embodiments of the present application, the four corners of the warning board are fixed with corner lamp plates, which are yellow LED lamp plates and can better penetrate dust and suspended matter.

[0008] In one or more embodiments of the present application, the support frame is fixed with a sound and light flash lamp, which can emit high-intensity flashes and high-decibel alarm sounds. The support frame is fixed with a millimeter wave radar near the sound and light flash lamp, and the millimeter wave radar and the sound and light flash lamp are electrically connected through a circuit.

[0009] In one or more embodiments of the present application, the side of each support frame away from the warning board is fixed with a storage bin, and the side of the storage bin away from the support frame is provided with an opening, and the opening is movably hinged with a cover plate. One of the storage bins is provided with a weight increasing part. The weight increasing part comprises a folding barrel, one side of which is connected with the inner wall of the storage bin. The folding barrel is a silica gel barrel, and a plurality of foldable support ribs are uniformly and spacedly fixed on the side of the folding barrel.

[0010] In one or more embodiments of the present application, the top of the warning board is fixed with two parallel and internally hollow upper cleaning plates, one of which is located above one display panel. A plurality of air jet nozzles are uniformly and spacedly fixed on each upper cleaning plate near the display panel, and the air jet nozzles are used to spray continuous airflow onto the surface of the display panel. The top of the warning board is fixed with an air pump, and the air outlet end of the air pump is fixed with an air pipe through a pipeline.

[0011] In one or more embodiments of the present application, the side of the warning board near the support frame is fixed with two parallel and internally hollow side cleaning plates, one of which is located on the side of one display panel. A plurality of air jet nozzles are uniformly and spacedly fixed on each side cleaning plate near the display panel, and the air jet nozzles are used to spray continuous airflow onto the surface of the display panel. Two of the side cleaning plates are connected through a gas guide pipe II, and the air pipe has two air outlet ends.

[0012] In one or more embodiments of the present application, the bottom of the warning board is fixed with a plurality of evenly spaced ribbons, which are reflective ribbons and can reflect light.

[0013] In one or more embodiments of the present application, a filtering device is fixed on the top of the warning board, and a feeding port is formed in the filtering device, the filtering device is used for intercepting dust particles with large particle size; The air inlet end of the air pump is fixed with an air inlet pipe, and the free end of the air inlet pipe extends into the filtering device.

[0014] In one or more embodiments of the present application, a transparent conductive film is coated on the surface of each display panel, and the transparent conductive film can form an electrostatic field to repel dust after being electrified; A solar panel is fixed on the top of the warning board, and a reflective strip is fixed along the outer periphery of the solar panel, and the solar panel is used to power the electronic device.

[0015] Compared with the prior art, the safety warning device for road construction site can remind the vehicles of the road construction in front, the moving object is more easily identified and positioned than the blurred static light spot, the warning effect is enhanced, the personal safety of the construction personnel is improved, and the efficiency of the road construction is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Figure 1 It is a perspective structural schematic view of an embodiment of the present application; Figure 2 It is a top view structural schematic view of an embodiment of the present application; Figure 3 It is a structural schematic view of the position relationship between the upper cleaning plate and the side cleaning plate in an embodiment of the present application; Figure 4 It is a structural schematic view of the position relationship between the display panel and the flashing plate in an embodiment of the present application; Figure 5 It is a structural schematic view of the position relationship between the folding barrel and the storage bin in an embodiment of the present application; Figure 6 It is a front view structural schematic view of an embodiment of the present application; Figure 7 It is a structural schematic view of the position relationship between the solar panel and the warning board in an embodiment of the present application.

[0018] Explanation of main reference signs: 100, support frame; 110, direct current brushless motor; 120, weight increasing part; 121, folding barrel; 1211, discharge port; 1212, support keel; 130, millimeter wave radar; 140, storage bin; 141, cover plate; 200, warning board; 210, display panel; 220, flashing board; 230, corner light board; 240, sound and light flashing lamp; 250, upper cleaning board; 251, air guide pipe one; 260, side cleaning board; 261, air guide pipe two; 270, air pump; 271, air pipe; 272, air inlet pipe; 273, filtering device; 280, ribbon; 290, solar panel. DETAILED DESCRIPTION

[0019] In order to make the person skilled in the art better understand the technical solutions in the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present disclosure.

[0020] As shown in the drawings, Figures 1 to 3 The safety warning device for road construction site in an embodiment of the present application comprises a support frame 100 and a warning board 200. The support frame 100 is provided with two parallel support frames 100. The warning board 200 is a parallelogram board comprising two inclined sides and four flat sides. Two flat sides of the warning board 200 close to the support frame 100 are respectively fixed with a rotating shaft. The free end of one rotating shaft is rotatably connected with one support frame 100. One support frame 100 is fixed with a direct current brushless motor 110 on the side away from the warning board 200. The output end of the direct current brushless motor 110 is connected with one rotating shaft. The direct current brushless motor 110 is used to drive the rotating movement of the warning board 200. The direct current brushless motor 110 can easily adjust the speed by changing the input voltage or PWM signal, so as to facilitate the accurate control of the rotating frequency of the warning board 200. The middle part of the two inclined sides of the warning board 200 is respectively fixed with a display panel 210. The display panel 210 is used to display graphics and text, so as to warn vehicles and pedestrians. The display panel 210 can automatically switch the display content according to the time, weather or traffic flow through programming, such as displaying an arrow during the day and adding the text of “night construction” on the basis of the arrow during the night. In the environment with a lot of wind, sand and dust, the large-area light-emitting surface of the display panel 210 has better penetration and recognition than the point light. The edges of the two inclined sides of the warning board 200 are respectively fixed with flash boards 220, which are amber LED lamp boards in quadrilateral frame shape, and the wavelength thereof is about 590nm, which can effectively penetrate the water mist, propagate a longer distance and maintain a higher intensity, and enhance the warning effect.

[0021] It is easy to understand that the two inclined sides of the warning board 200 are directed to the vehicles and pedestrians, and the inclined sides of the warning board 200 have a larger warning angle than the plane, which can increase the warning range and remind the vehicles at the complex intersection.

[0022] Specifically, as shown in the figure, Figures 1 to 3 The rotating speed of the warning board 200 is between 45r / min and 75r / min, which can maintain the dynamic movement of the warning board 200 and enable the vehicles to clearly observe the characters and graphics on the display panel 210.

[0023] It is worth noting that the height of the warning board 200 is between 40cm and 50cm, and when the vehicle speed is 100km / h and the distance from the warning board 200 is 30m to 150m, the images and characters on the warning board 200 can be clearly observed.

[0024] Specifically, as shown in the figure, Figures 1 to 5 The four corners of the warning board 200 are fixed with corner lamp boards 230, which are yellow LED lamp boards and can better penetrate the dust and suspended matter, and the wavelength of the corner lamp boards 230 is about 590nm, and the corner lamp boards 230 are distributed around the warning board 200, which can achieve the effect of omnidirectional warning and expand the warning range.

[0025] Specifically, as shown in the figure, Figures 1 to 5 The sound and light flash lamp 240 is fixed on the support frame 100, which can emit high-intensity flash and high-decibel alarm sound, that is, the sound and light flash lamp 240 is designed in integration of high-intensity flash and high-decibel alarm sound, which can further improve the safety of road construction warning. The millimeter wave radar 130 is fixed on the support frame 100 near the sound and light flash lamp 240, and the millimeter wave radar 130 and the sound and light flash lamp 240 are electrically connected through a circuit.

[0026] It should be noted that the millimeter wave radar 130 is a low-power, small-size 24GHz or 60GHz millimeter wave radar module, which can accurately detect the presence, distance, speed and direction of motion of the vehicle, and is not affected by light, fog, dust, rain and snow. When there is no vehicle approaching, the millimeter wave radar 130 is in standby / low-power mode. When a vehicle approaches quickly, the millimeter wave radar 130 receives radar data, runs an algorithm to determine the vehicle state, and sends a sound control instruction to the sound and light flashing lamp 240, causing the sound and light flashing lamp 240 to sound an alarm, reminding the vehicle approaching quickly that there is an abnormal situation in front of it, so that the vehicle can react in time.

[0027] Specifically, as shown in Figures 1 to 5 Each of the support frames 100 has a storage bin 140 fixed to the side away from the warning board 200. The side of the storage bin 140 away from the support frame 100 is provided with an opening, and a cover plate 141 is hingedly connected to the opening. The cover plate 141 is used to cover the opening of the storage bin 140, so as to protect the weight-increasing part 120 from being directly exposed to the outside. One of the storage bins 140 is provided with a weight-increasing part 120. The weight-increasing part 120 includes a folding barrel 121, one side of which is connected to the inner wall of the storage bin 140. The folding barrel 121 is a silica gel barrel, and a plurality of foldable support ribs 1212 are uniformly and spacedly fixed to the side of the folding barrel 121. The folding barrel 121 can be folded and stretched, and can be in contact with the ground after being filled with water or sand.

[0028] It is easy to understand that the folding barrel 121 can be folded in the storage bin 140. The volume of the folding barrel 121 after being folded is only 1 / 5 to 1 / 10 of that in the unfolded state, which greatly saves transportation and storage space.

[0029] Specifically, as shown in Figures 3 to 5 The inside of the folding barrel 121 can be filled with sand after being stretched. The folding barrel 121 forms a barrel-shaped container with a certain self-standing ability after being stretched and unfolded, and can stably hold water or sand. The side of the folding barrel 121 is provided with a discharge port 1211, and a sealing cover is sleeved on the free end of the discharge port 1211.

[0030] It is easy to understand that there is more sand in an environment with a lot of wind, sand and dust. Therefore, it is preferred to store sand. The sand is put into the folding barrel 121 to increase the weight of the entire device and ensure the stability of the device in use. Water can also be injected into the folding barrel 121, or stones or sandbags can be stacked in the folding barrel 121, which can achieve the purpose of increasing the weight of the device. The sealing cover can withstand the water pressure in the folding barrel 121 and is not easy to leak. After the device is used, the sealing cover is opened to discharge the weight-increasing material in the folding barrel 121.

[0031] In the above embodiment, when the device is placed in the designated warning area during road construction, the cover plate 141 is then opened, and the folding barrel 121 is stretched outwards to unfold, and the sand and soil in the construction environment is poured into the folding barrel 121 to increase the overall weight of the device. Then the DC brushless motor 110 is started, which drives the rotating shaft to rotate, thereby driving the warning board 200 to rotate, so that the warning board 200 is in a state of dynamic change, breaking the visual habit and increasing the attention of the brain. In the low-contrast environment caused by wind, sand and dust, a clear moving object is easier to identify and locate than a blurred static light spot. At the same time, the text and graphics on the surface of the display panel 210 remind passing vehicles. When a vehicle approaches quickly, the millimeter wave radar 130 receives radar data and sends a sound control instruction to the sound and light flashing lamp 240, causing the sound and light flashing lamp 240 to emit a sound alarm, which can remind the vehicle approaching quickly that there is an abnormal situation in front of it, enhancing the warning effect and improving the safety of construction personnel and the efficiency of road construction. The device can significantly reduce the risk of accidents in the construction area and reduce the delay and compensation costs caused by accidents. At the same time, the use of on-site sand ballast, low-power motor and intelligent warning design reduces operating and maintenance costs, improves construction efficiency over the long term, and has high economic value and promotional value. In some embodiments of the present application, considering that the dust in the windy and sandy area is large, the dust covering the surface of the display panel 210 can easily cause the image and text on the display panel 210 to be blurred, which requires frequent manual cleaning, which is risky and can reduce construction efficiency. Therefore, further improvements are made to address the above problems, as shown in Figures 3 to 7 The top of the warning board 200 is fixed with two parallel and internally hollow upper cleaning plates 250, one of which is located above one display panel 210. A plurality of air jet nozzles are uniformly and spacedly fixed on each upper cleaning plate 250 near the display panel 210, which are used to spray continuous airflow onto the surface of the display panel 210 for cleaning. The top of the warning board 200 is fixed with a gas pump 270, the gas outlet end of which is fixed with an air pipe 271 through a pipeline, the free end of which is connected with the air guide pipe one 251, and the air pipe 271 and the air guide pipe one 251 are internally communicated.

[0032] Specifically, as shown in Figures 3 to 7 The side of the warning board 200 near the support frame 100 is fixed with two parallel and internally hollow side cleaning plates 260, one of which is located on the side of one display panel 210. ​A plurality of nozzles are uniformly spaced and fixed on each of the side cleaning plates 260 near the display panel 210, and the nozzles are used to spray continuous airflow on the surface of the display panel 210. The two side cleaning plates 260 are connected by the air guide pipe two 261, which is located between the warning plate 200 and the support frame 100 and does not affect the rotating movement of the warning plate 200. The air guide pipe two 261 has two air outlet ends, one of which is connected with the air guide pipe one 251, and the other of which is connected with the air guide pipe two 261. Valves are fixed on the two air outlet ends of the air guide pipe two 261.

[0033] It should be noted that the length of the upper cleaning plate 250 is greater than the length of the display panel 210, and the length of the side cleaning plate 260 is greater than the width of the display panel 210. The continuous airflow sprayed by the air jet nozzle and the nozzle can cover the surface of the display panel 210.

[0034] Specifically, as shown in the drawings, Figures 3 to 6 The warning plate 200 is fixed with a filter device 273 at the top, and the filter device 273 is provided with an inlet. A plurality of precision filter screens are detachably connected in the filter device 273. The detachable structure is preferably a buckle type detachable structure, or other detachable structures that are convenient to detach. The precision filter screens can be easily detached and cleaned for repeated use. The precision filter screens can intercept dust particles with a particle size of 5 microns or more. Dust particles with a particle size of less than 5 microns enter the air inlet pipe 272. The sand and dust enter the filter device 273 from the inlet, and the filter device 273 is used to intercept dust particles with a large particle size. By increasing the contact force between the small particle size dust particles and the surface of the display panel 210, the cleaning efficiency is improved. The air inlet end of the air pump 270 is fixed with an air inlet pipe 272. The air pump 270 is a micro pneumatic diaphragm pump, which can suck small particle size dust particles filtered by the filter device 273 into the air inlet pipe 272, and then spray them into the upper cleaning plate 250 or the side cleaning plate 260 from the air guide pipe 271. The free end of the air inlet pipe 272 extends into the filter device 273.

[0035] It is worth noting that by using the dust particles in the wind and sand dust environment, the cleaning effect of the display panel 210 can be improved. At the same time, during the rotation of the warning plate 200, dust particles with a large particle size can be thrown out of the inlet, which can clean dust particles with a large particle size and reduce the subsequent workload.

[0036] Specifically, as shown in the drawings, Figure 7 The bottom of the warning plate 200 is fixed with a plurality of evenly spaced ribbons 280. The ribbons 280 are reflective and can reflect light.

[0037] It should be noted that when the warning board 200 rotates, the ribbon 280 is swung under the action of centrifugal force, which can increase the height of the warning and reflect light when the opposite vehicle turns on the light, increasing the warning effect, while the ribbon 280 swings to disperse the dust around the warning board 200, reducing the adsorption of dust on the surface of the display panel 210.

[0038] It should be noted that when the cleaning plate 250 is cleaned, the valve at the connection between the air pipe 271 and the air guide pipe 251 is opened, and at this time, the valve at the connection between the air pipe 271 and the air guide pipe 261 is closed, and vice versa. Specifically, as shown in Figure 7 Each of the display panels 210 is coated with a transparent conductive film, which can form an electrostatic field to repel dust after being electrified. The top of the warning board 200 is fixed with a solar panel 290, and the outer periphery of the solar panel 290 is fixed with a reflective strip. The reflective strip is used to reflect light, and the solar panel 290 is used to power the electronic device. The solar panel 290 is the power supply of the device, and is electrically connected with the battery and the controller through the circuit, so as to store the light energy absorbed by the solar panel 290, and the layout of each circuit does not affect the rotating movement of the warning board 200.

[0039] On the basis of the above-mentioned embodiments, the rotating movement of the warning board 200 can reduce the adsorption of dust, and at the same time, the small particle size dust particles filtered by the filtering device 273 are sucked into the air inlet pipe 272 by the air pump 270, and then sent into the air pipe 271. First, open the valve at the connection between the air pipe 271 and the air guide pipe one 251, and close the valve at the connection between the air pipe 271 and the air guide pipe two 261. The small particle size dust particles enter the upper cleaning plate 250, and the continuous airflow with dust particles is sprayed from top to bottom on the surface of the display panel 210 by the air jet nozzle of the upper cleaning plate 250 to clean the dust. Then, close the valve at the connection between the air pipe 271 and the air guide pipe one 251, and open the valve at the connection between the air pipe 271 and the air guide pipe two 261. The small particle size dust particles enter the side cleaning plate 260, and the continuous airflow with dust particles is sprayed from left to right on the surface of the display panel 210 by the nozzle of the side cleaning plate 260 to clean the dust. This is one cleaning cycle. After one cleaning cycle, the air pump 270 stops working. The time of intermittent operation of the air pump 270 is set according to the sand and dust conditions of the construction environment. The more sand and dust, the shorter the intermittent operation time of the air pump 270, which ensures the clarity of the surface of the display panel 210, improves the warning effect, reduces the manual burden, and thus improves the construction efficiency. The device significantly reduces the frequency of manual cleaning and maintenance, reduces long-term labor costs, uses environmental dust as a cleaning medium, saves consumable expenses, maintains the clarity of the warning panel, helps prevent accidents, reduces construction delays and related economic compensation, and thus improves overall construction economic benefits and equipment investment return rate.

[0040] It is apparent for those skilled in the art that the present disclosure is not limited to the details of the above-mentioned exemplary embodiments, and the present disclosure can be implemented in other specific forms without departing from the spirit or essential characteristics of the present disclosure. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the present disclosure is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be considered as limiting the involved claims.

[0041] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A safety warning device for road construction sites, comprising a support frame (100) and a warning board (200), characterized in that, There are two support frames (100); The warning board (200) is a parallelogram board and includes two inclined sides and four flat sides. Two flat sides of the warning board (200) near the support frame (100) are respectively fixed with rotating shafts, and the unused end of one rotating shaft is rotatably connected to a support frame (100). A brushless DC motor (110) is fixed on one of the support frames (100) away from the warning plate (200), and the brushless DC motor (110) is used to drive the warning plate (200) to rotate. The warning board (200) has a display panel (210) fixed to the middle of the two oblique sides, and the display panel (210) is used to display graphics and text; The warning board (200) has flashing boards (220) fixed to the edges of its two oblique sides. The flashing boards (220) are amber-colored LED light boards in the shape of a quadrilateral frame, and their wavelength is about 590nm.

2. The safety warning device for road construction sites according to claim 1, characterized in that, The rotational speed of the warning plate (200) is between 45 r / min and 75 r / min.

3. The safety warning device for road construction sites according to claim 1, characterized in that, The warning board (200) has corner light panels (230) fixed at its four corners. The corner light panels (230) are yellow LED light panels and can better penetrate sand and dust suspended matter.

4. The safety warning device for road construction sites according to claim 1, characterized in that, The support frame (100) is fixed with a sound and light strobe light (240), which can emit high-intensity flashes and high-decibel alarm sounds; A millimeter-wave radar (130) is fixed on the support frame (100) near the sound and light strobe lamp (240), and the millimeter-wave radar (130) and the sound and light strobe lamp (240) are electrically connected by a circuit.

5. The safety warning device for road construction sites according to claim 1, characterized in that, Each of the support frames (100) has a storage compartment (140) fixed on the side away from the warning plate (200). The storage compartment (140) has an opening on the side away from the support frame (100), and a cover plate (141) is movably hinged to the opening. A weight-increasing unit (120) is provided in one of the storage compartments (140); The weight-adding section (120) includes a folding barrel (121), one side of which is connected to the inner wall of the storage compartment (140); The folding barrel (121) is a silicone barrel and has multiple foldable support keels (1212) fixed evenly spaced on its side. The folding barrel (121) can be folded and stretched.

6. The safety warning device for road construction sites according to claim 5, characterized in that, The warning panel (200) has two parallel and hollow upper cleaning plates (250) fixed to its top, with one upper cleaning plate (250) located above a display panel (210); Each of the upper cleaning plates (250) has multiple air nozzles evenly spaced near the display panel (210). The air nozzles are used to spray a continuous airflow onto the surface of the display panel (210). The two upper cleaning plates (250) are connected by an air guide pipe (251). An air pump (270) is fixed on the top of the warning board (200). The air outlet of the air pump (270) is fixed with a vent pipe (271) through a pipe. The empty end of the vent pipe (271) is connected to the air guide pipe (251).

7. The safety warning device for road construction sites according to claim 1, characterized in that, Two parallel and hollow side cleaning plates (260) are fixed on the side of the warning plate (200) near the support frame (100), and one side cleaning plate (260) is located on the side of a display panel (210). Each of the side cleaning plates (260) has a plurality of nozzles fixed at even intervals near the display panel (210), the nozzles being used to spray a continuous airflow onto the surface of the display panel (210); The two side cleaning plates (260) are connected by a second air duct (261). The air duct (271) has two air outlets. One air outlet of the air duct (271) is connected to the first air duct (251), and the other air outlet of the air duct (271) is connected to the second air duct (261). Valves are fixed on both air outlets of the air duct (271).

8. The safety warning device for road construction sites according to claim 1, characterized in that, The bottom of the warning board (200) is fixed with a plurality of evenly spaced ribbons (280), which are reflective and capable of reflecting light.

9. The safety warning device for road construction sites according to claim 6, characterized in that, The warning plate (200) is fixed with a filter device (273) on top. The filter device (273) has a feed inlet and is used to intercept large-diameter dust particles. The air pump (270) has an air inlet pipe (272) fixed at its air inlet end, and the empty end of the air inlet pipe (272) extends into the filter device (273).

10. The safety warning device for road construction sites according to claim 1, characterized in that, Each of the display panels (210) is coated with a transparent conductive film. When the transparent conductive film is energized, it can form an electrostatic field to repel dust. A solar panel (290) is fixed to the top of the warning board (200), and a reflective strip is fixed to the outer periphery of the solar panel (290). The solar panel (290) is used to power electronic equipment.

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