An automatic dust removal system for bus stop and intelligent bus stop

Abstract

The application relates to a bus stop automatic dust removal system and an intelligent bus stop, which comprises a filter device arranged at a ventilation opening, further comprises: a blockage detection device for detecting the blockage state of the filter device; a dust removal and cleaning device installed on the filter device, which is used for cleaning dust on the filter device and collecting and conveying the dust to a filter discharge device; the filter discharge device is connected with the dust removal and cleaning device through a wind pipe and is used for mixing the collected dust with water to form mud water and discharge the mud water; a controller connected with the blockage detection device, the dust removal and cleaning device and the filter discharge device is configured to start the dust removal and cleaning device when the blockage state reaches a set condition and to discharge the mud water when the filter discharge device reaches a discharge index. The application can monitor the blockage state of the filter device in real time, automatically start the dust removal system, effectively ensure the air inlet amount of the bus stop, prolong the service life of electrical components of the bus stop, and simultaneously adopt a wet dust removal mode to achieve the purpose of green and environmentally-friendly discharge.

Description

Technical Field

[0001] This invention belongs to the field of bus stop sign technology, and specifically relates to an automatic dust removal system for bus stop signs and an intelligent bus stop sign. Background Technology

[0002] To provide passengers with bus information, bus stops are typically equipped with signs. With advancements in technology and improved living standards, these signs are becoming increasingly intelligent. Smart electronic bus stop signs generally include a display screen showing the stop name, information on all bus routes stopping at that stop, bus operation information, and other relevant details. They also typically include internal lighting and other equipment.

[0003] Because many electrical components are installed inside the bus stop sign, these components generate a lot of heat during operation. If this heat is not dissipated, it will seriously affect the working condition and lifespan of the electrical components. Therefore, a ventilation system is installed on the bus stop sign, and vents are installed on the outer shell of the sign to cool down the electrical components inside.

[0004] Because electronic bus stop signs are usually installed close to the roadside, a lot of dust is stirred up by passing vehicles. The dust usually enters the interior of the electronic bus stop sign through its ventilation system. In addition, sewage and rainwater splashed up by vehicles can also contaminate the bus stop sign.

[0005] Conventional electronic bus stop signs typically have filters installed at the ventilation openings of their systems to prevent dust and wastewater from entering. Over time, a large amount of dust and dirt accumulates on the surface of the filters, resulting in insufficient airflow inside the bus stop sign. This affects heat dissipation, leading to excessively high temperatures in the internal electrical components, which can shorten their lifespan or cause damage.

[0006] The existing technical solution involves manually cleaning or replacing the filter cotton at the ventilation openings periodically, which undoubtedly increases labor and operating costs. However, due to the different environments on both sides of the road where the bus stop is located, the amount of dust encountered varies. In areas with more dust, manual cleaning may not be possible in a timely manner, leading to poor heat dissipation and aging damage to the electrical components inside the bus stop. In areas with less dust, cleaning may not be necessary for a short period, resulting in wasted labor. Furthermore, manual dust cleaning can cause dust to fly around, causing secondary pollution to the surrounding environment. Summary of the Invention

[0007] The main technical problem solved by this invention is to provide an automatic dust removal system for bus stop signs that can automatically detect and clean blocked ventilation openings without causing secondary pollution, and to provide an intelligent bus stop sign equipped with the dust removal system.

[0008] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0009] An automatic dust removal system for bus stop signs includes a filter device installed at the ventilation opening, and further includes:

[0010] A clogging detection device is used to detect the clogging status of the filter device;

[0011] A dust removal and cleaning device is installed on the filter device to clean the dust on the filter device and collect and transport it to the filter discharge device;

[0012] The filtration and discharge device is connected to the dust removal and cleaning device through an air duct, and is used to mix the collected dust with water to form muddy water and discharge it.

[0013] The controller, connected to the blockage detection device, dust removal and cleaning device, and filter discharge device, is configured to activate the dust removal and cleaning device when the blockage condition reaches a set condition and to discharge mud and water when the filter discharge device reaches the discharge target.

[0014] Furthermore, the blockage detection device includes an airflow detection device for detecting the ventilation volume of the filter device, and the controller determines the blockage status of the filter device based on whether the detected ventilation volume meets the set conditions.

[0015] Furthermore, the dust removal and cleaning device includes a cleaning device, a drive mechanism, an air duct, and a dust removal fan. The cleaning device is installed on the filter device. The drive mechanism is connected to the cleaning device and drives the cleaning device to move back and forth along the filter device. One end of the air duct is connected to the cleaning device, and the other end of the air duct is connected to the filter discharge device. A dust removal fan is installed on the air duct.

[0016] Furthermore, the filtration and discharge device includes a filter container, a discharge device connected to the filter container, and a water supply system. The filter container is connected to a dust removal and cleaning device through a duct. The dust collected during cleaning is collected in the filter container. Water is injected into the filter container by the water supply system. The collected dust and water mix in the filter container to form muddy water, which is then discharged by the discharge device.

[0017] Furthermore, the water supply system includes a rainwater collector and / or an external water source. The rainwater collector and the external water source are connected to the filter container via pipelines. A first control valve is connected in series on the pipeline between the rainwater collector and the filter container, and a second control valve is connected in series on the pipeline between the external water source and the filter container. The first control valve and the second control valve are connected to the controller.

[0018] Furthermore, a storage tank is provided at the water inlet end of the filter container. The rainwater collector and the external water source are connected to the storage tank through pipelines. The storage tank is connected to the filter container through a drain pipeline. A third control valve is connected in series on the drain pipeline and is connected to the controller.

[0019] Furthermore, the filter container is connected to an exhaust device, through which the filtered clean air is discharged and blown towards the electrical control box inside the bus stop sign.

[0020] Furthermore, a partition is installed inside the box of the bus stop sign to enclose a space. An electrical control box is installed in the space. The exhaust device includes an exhaust pipe connected to a filter container and an exhaust port provided on the partition. The exhaust pipe is connected to the exhaust port, and the filtered clean air is blown toward the electrical control box through the exhaust pipe and the exhaust port.

[0021] Furthermore, an automatic stirrer is installed inside the filter container.

[0022] Another technical solution of the present invention is:

[0023] A smart bus stop sign is equipped with the automatic dust removal system described above.

[0024] In summary, the automatic dust removal system and intelligent bus stop sign provided by this invention have the following advantages compared with the prior art:

[0025] (1) The present invention can monitor in real time whether the filter device on the bus stop sign is clogged and needs to be cleaned, and automatically start the dust removal system when it is determined that a clogged state has occurred. This can effectively ensure the air intake of the bus stop sign's heat dissipation system, avoid the aging and damage of electrical components inside the bus stop sign due to excessive temperature rise, and extend the service life of the electrical components of the bus stop sign.

[0026] (2) The present invention adopts a wet dust removal method, which mixes the dust and water after sweeping to form mud water, and then discharges the mud water into flower beds or sewers, which will not cause secondary pollution, thereby achieving the purpose of green and environmentally friendly discharge. At the same time, it avoids the need for manual dust treatment and saves manpower.

[0027] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0028] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0029] In the attached diagram:

[0030] Figure 1 This is a schematic diagram of the bus stop sign structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the internal structure of the bus stop sign of the present invention. Figure 1 ;

[0032] Figure 3 This is a schematic diagram of the internal structure of the bus stop sign of the present invention. Figure 2 ;

[0033] Figure 4 This is a structural diagram of the dust removal system of the present invention.

[0034] In the picture:

[0035] 1. Cabinet; 2. Lightbox; 3. LCD display screen; 4. Ventilation vent.

[0036] Filter device 5, filter frame 51, filter grid 52, filter cotton 53;

[0037] Electrical control box 6;

[0038] Dust removal and cleaning device 7, cleaning device 71, brush 711, drive mechanism 72, servo motor 721, lead screw 722, air duct 73, dust removal fan 74, left limit switch 75, right limit switch 76.

[0039] 8. Filter discharge device, 81. Filter container, 82. Discharge device, 821. Water supply system, 83. Rainwater collector, 831. External water source, 832. Filter screen, 833. Storage tank, 84. Exhaust pipe, 85. Exhaust port, 86. Overflow pipe, 87. Agitator, 88. Drainage pipe, 89.

[0040] First control valve 9, second control valve 10, third control valve 11, fourth control valve 12, first liquid level detection device 13, second liquid level detection device 14, third liquid level detection device 15, fourth liquid level detection device 16, fifth liquid level detection device 17, liquid concentration sensor 18, first partition 19, second partition 20.

[0041] It should be noted that the accompanying drawings and text description are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] like Figures 1 to 4 As shown, this invention provides an automatic dust removal system for bus stop signs, installed on intelligent bus stop signs. The intelligent bus stop sign provided by this invention includes a housing 1, a lightbox 2 mounted on top of the housing 1, an LCD display screen 3 mounted on the front of the housing 1, the LCD display screen 3 connected to an electrical control box 6, the electrical control box 6 installed inside the housing 1 behind the LCD display screen 3, and a ventilation opening 4 provided below the LCD display screen 3 for heat dissipation and cooling of the electrical components inside the housing 1. A filter device 5 is installed at the ventilation opening 4. This automatic dust removal system is used to clean dust and other debris from the filter device 5, collect the dust and mix it with water to form muddy water, which is then discharged.

[0046] In this embodiment, preferably, the filter device 5 includes a filter frame 51, which is fixed to the housing 1 at the vent 4. A filter grille 52 and filter cotton 53 are installed on the filter frame 51, and the filter grille 52 and filter cotton 53 are sequentially installed on the filter frame 51. To facilitate the replacement of the filter cotton 53, the filter cotton 53 is preferably installed on the filter frame 52 with a detachable structure. The filter grille 52 preferably has several ventilation holes directly opened on the front panel of the housing 1.

[0047] like Figures 2 to 4As shown, the automatic dust removal system for bus stop signs provided by the present invention includes a blockage detection device (not shown in the figure), a dust removal and cleaning device 7, a filtration and emission device 8, and a controller (not shown in the figure). The blockage detection device, dust removal and cleaning device 7, and filtration and emission device 8 are all connected to the controller and controlled by it. The controller is preferably a PLC programmable controller and can be integrated into the electrical control box 6.

[0048] The clogging detection device is used to detect the clogging status of the filter device 5. In this embodiment, the clogging status of the filter device 5 is preferably determined by detecting the airflow at the vent 4, that is, determining whether the filter cotton 53 needs to be cleaned and dusted.

[0049] Specifically, the blockage detection device preferably uses an airflow meter, which is connected to a controller. The controller 6 includes a blockage monitoring module, a blockage judgment module, and a blockage output module. The blockage monitoring module, connected to the airflow meter, monitors the airflow of the filter cotton 53 in real time. The blockage judgment module stores pre-set conditions, including a lower airflow threshold, to determine whether the filter cotton 53 is blocked based on whether the real-time monitored airflow meets these conditions. The blockage judgment module sends the judgment result to the blockage output module. The blockage output module receives the judgment result; if it determines that the filter cotton 53 is blocked, it controls the alarm device to sound and simultaneously activates the dust removal and cleaning device 7 to clean and remove dust from the filter cotton 53.

[0050] In this embodiment, the dust removal and cleaning device 7 is installed on the filter device 5 to clean the dust on the filter device 5 and collect and transport it to the filter discharge device 8. The dust removal and cleaning device 7 is activated after the bus stop heat dissipation system is started, when the controller detects that the airflow through the filter cotton 53 has dropped to the lower airflow threshold. This activates the dust removal and cleaning device 7 to clean the filter cotton 53, ensuring sufficient airflow for the bus stop heat dissipation system, improving heat dissipation, and extending the service life of the bus stop electrical components.

[0051] The dust removal and cleaning device 7 has two implementation methods for determining the end time of dust removal. One method involves controlling the cleaning time by pre-storing a set time in the controller. When the set time is reached, the controller stops the dust removal and cleaning device 7. The other implementation method involves pre-storing an upper airflow threshold in the controller. An airflow meter monitors the airflow at the vent 4 in real time during cleaning. When the airflow reaches the upper airflow threshold, it is determined that the filter device 5 has been cleaned, and the controller stops the dust removal and cleaning device 7.

[0052] In this embodiment, the dust removal and cleaning device 7 is further preferably comprised of a cleaning device 71, a drive mechanism 72, an air duct 73, and a dust removal fan 74. The cleaning device 71 is mounted on the filter frame 51 of the filter device 5. The drive mechanism 72 is connected to the cleaning device 71, driving the cleaning device 71 to reciprocate along the filter device 5 (i.e., in the left-right direction in the figure). One end of the air duct 73 is connected to the cleaning device 71, and the other end is connected to the filter discharge device 8. The dust removal fan 74 is mounted on the air duct 73. Under the action of the dust removal fan 74, the dust swept down by the cleaning device 71, along with air, is transported through the air duct 73 to the filter discharge device 8. The air duct 73 is preferably a flexible pipe, and the dust removal fan 74 is placed inside the housing 1. Under the action of the dust removal fan 74, the dust swept off the filter cotton 53 by the brush 711, along with the air, is sucked into the filter container 81 through the air duct 73, where it mixes with the water in the filter container 81 to form muddy water. The filtered clean air is then discharged.

[0053] In this embodiment, more preferably, the drive mechanism 72 includes a servo motor 721 and a lead screw 722. The output shaft of the servo motor 721 is connected to the lead screw 722. The cleaning device 71 uses a brush 711, which is threadedly connected to the lead screw 722. The lead screw 722 is rotatably mounted on the filter frame 51 of the filter device 5. After the servo motor 721 receives a command from the controller and starts, it drives the brush 711 to reciprocate in the left and right direction to clean the filter cotton 53. The dust removal fan 74 is preferably a turbine fan. The negative pressure generated by the dust removal fan 74 when it starts transports the air containing dust to the filter discharge device 8.

[0054] In this embodiment, a limit switch is also installed on the filter frame 51 to limit the maximum stroke of the brush 711 moving left and right. The limit switches are located at the left limit switch 75 and the right limit switch 76. When the brush 711 moves left and right and touches the left limit switch 75 or the right limit switch 76, the servo motor 721 is controlled to rotate in the opposite direction, so that the brush 711 moves in the opposite direction and realizes reciprocating motion.

[0055] In this embodiment, the filtration and discharge device 8 is connected to the brush 711 of the dust removal and cleaning device 7 via the air duct 73. The brush 711 collects dust and mixes it with water to form muddy water, which is then discharged. This dust removal system uses a wet dust removal method, mixing the collected dust with water to form muddy water, which is then directly discharged into flower beds or sewers. This achieves green and environmentally friendly emissions, avoiding the need for manual dust handling and saving manpower.

[0056] In this embodiment, preferably, the filtration and discharge device 8 includes a filter container 81, a discharge device 82, and a water supply system 83. The discharge device 82 and the water supply system 83 are connected to the filter container 81. The filter container 81 is connected to the brush 711 of the dust removal and cleaning device 7 via a duct 73. The dust collected during cleaning is collected in the filter container 81 through the duct 73. Water is injected into the filter container 81 by the water supply system 83. The collected dust and water mix in the filter container 81 to form muddy water, which is then discharged by the discharge device 82. More preferably, the end of the duct 73 extends directly into the filter container 81 near the bottom and is placed in the water inside the filter container 81. After air is discharged from the duct 73, the dust mixes directly with the water to form muddy water, while the clean air is discharged upwards from the water surface.

[0057] In this embodiment, the water supply system 83 is further preferably configured to include a rainwater collector 831 or an external water source 832. More preferably, the water supply system 83 employs both a rainwater collector 831 and an external water source 832, with the rainwater collector 831 and the external water source 832 connected to the filter container 81 via pipelines. Preferably, the rainwater collector 831 collects rainwater and supplies water to the filter container 81. Water is only supplied to the filter container 81 through the external water source 832 when the water collected in the rainwater collector 831 is insufficient to meet the water demand of the filter container 81. This effectively reduces water consumption and achieves the goal of water conservation and environmental protection.

[0058] In this embodiment, to better meet the water demand of the filter container 81 at any time, a storage tank 84 is further provided at the water inlet of the filter container 81. The storage tank 84 is connected to the filter container 81 through a drain pipe 89. A first control valve 9 is connected in series on the pipe between the rainwater collector 831 and the storage tank 84, a second control valve 10 is connected in series on the pipe between the external water source 832 and the filter container 81, and a third control valve 11 is connected in series on the drain pipe 89 of the storage tank 84. The first control valve 9, the second control valve 10, and the third control valve 11 are all connected to the controller.

[0059] In this embodiment, the discharge device 82 includes a sewage pipe 821, one end of which passes through the bottom of the housing 1. A fourth control valve 12 is installed on the sewage pipe 821. When the mud and water concentration in the filter container 81 reaches the discharge index, the fourth control valve 12 is controlled to open and discharge.

[0060] In this embodiment, it is further preferred that an overflow pipe 87 is connected to the filter container 81, and the other end of the overflow pipe 87 is connected to the drain pipe 821 at the rear end of the fourth control valve 12. When the liquid level in the filter container 81 exceeds the set value and the liquid level sensor malfunctions, the muddy water in the filter container 81 enters the drain pipe 821 through the overflow pipe 87 and is finally discharged through the drain pipe 821.

[0061] In this embodiment, liquid level detection devices are also installed in the filter container 81, the rainwater collector 831, and the storage tank 84, respectively. Specifically, such as... Figure 4 As shown, a first liquid level detection device 13 is installed at the bottom of the rainwater collector 831, which detects the lower limit of the liquid level in the rainwater collector 831. A second liquid level detection device 14 and a third liquid level detection device 15 are installed inside the storage tank 84. The second liquid level detection device 14 detects the upper limit of the liquid level in the storage tank 84, and the third liquid level detection device 15 detects the lower limit of the liquid level in the storage tank 84. A fourth liquid level detection device 16 and a fifth liquid level detection device 17 are installed in the filter container 81. The fourth liquid level detection device 16 detects the upper limit of the liquid level in the filter container 81, and the fifth liquid level detection device 17 detects the lower limit of the liquid level in the filter container 81. All of the above liquid level detection devices are connected to the controller.

[0062] When the water level in the rainwater collector 831 reaches the lower limit, the first level detection device 13 alarms, and the controller closes the first control valve 9 to continue collecting rainwater, while the second control valve 10 opens to supply water to the storage tank 84 using the external water source 832. When the water level in the storage tank 84 reaches the upper limit, the second level detection device 14 alarms, and the controller closes the second control valve 10 to stop supplying water to the storage tank 84. When the mud and water in the filter container 81 reach the discharge threshold and are completely discharged, the fifth level detection device 17 alarms, and the controller opens the third control valve 11 to inject water from the storage tank 84 into the filter container 81 until the water level in the filter container 81 reaches the upper limit, at which point the controller closes the third control valve 11 to stop supplying water to the filter container 81.

[0063] In this embodiment, a photoelectric liquid concentration sensor 18 is also installed in the filter container 81 to determine the concentration of the mixed mud and water in the filter container 81, i.e. the transparency of the mud and water. When the mud and sand content in the mud and water reaches the discharge index, which refers to the mud and sand content reaching a certain threshold, the mud and water in the filter container 81 is discharged in a timely manner.

[0064] The controller also includes a concentration monitoring module, a concentration judgment module, and a concentration output module. The concentration monitoring module is connected to the liquid concentration sensor 18 to monitor the mud-water concentration in the filter container 81 in real time. The concentration judgment module has pre-stored discharge indicators and sends the judgment result information to the concentration output module based on whether the real-time monitored mud-water concentration reaches the discharge indicators. After receiving the judgment result information, if the concentration output module determines that the mud-water concentration has reached the discharge indicators, it controls the discharge device 82 to discharge all the mud-water in the filter container 81, which is then discharged into the flower bed or sewer. During a single dust removal operation, if the transparency of the mud-water in the filter container 81 drops to a set lower limit, the dust removal is stopped, and the fourth control valve 12 is activated to discharge the mud-water into the external flower bed soil.

[0065] In this embodiment, it is further preferred that the filter container 81 is connected to an exhaust device, and the filtered clean air is discharged through the exhaust device and blown towards the electrical control box 6 inside the bus stop sign to cool the electrical control box 6. This achieves the purpose of heat dissipation and cooling, while also ensuring the cleanliness of the air blown towards the electrical control box 6, thus ensuring the service life of the electrical control box 6.

[0066] In this embodiment, a partition is installed inside the box 1 of the bus stop sign to enclose a space. An electrical control box 6 is installed within this space. Specifically, the partition includes a first partition 19 and a second partition 20. The first partition 19 is vertically installed inside the box 1. The electrical control box 6 and the filter container 81 are located on opposite sides of the first partition 19 to ensure that the electrical control box 6 is not affected by the filter container 81 and other components, thus ensuring its normal operation. The second partition 20 is horizontally placed inside the box 1. The bottom of the first partition 19 is fixed to the second partition 20. The filter device 5 and the dust removal and cleaning device 7 are installed below the second partition 20. The sewage pipe 821 and the overflow pipe 87 both pass through the second partition 12.

[0067] Specifically, the exhaust device includes an exhaust pipe 85 connected to the filter container 81 and an exhaust port 86 disposed on the first partition 19. The exhaust pipe 85 is connected to the exhaust port 86, and the filtered clean air is blown towards the electrical control box 6 through the exhaust pipe 85 and the exhaust port 86. The exhaust pipe 85 is connected to the filter container 81 at the top of the filter container 81.

[0068] In this embodiment, to prevent dust from settling in the filter container 81, it is preferable to equip the filter container 81 with a stirrer 88, which is driven by a drive motor.

[0069] In this embodiment, the filter container 81 is rinsed after each dust removal operation to prevent dust accumulation and blockage. At this time, the controller opens the third control valve 11 to inject water into the filter container 81 for secondary dust removal, preventing blockage of the filter container 81 and the drain pipe 821.

[0070] Specifically, such as Figure 2 and Figure 3 As shown, a rainwater collector 831 is installed on the top of the housing 1, i.e., inside the light box 2, to collect rainwater. A filter screen 833 is further installed on the top of the rainwater collector 831 to filter impurities from the rainwater. Pipelines, a first control valve 9, a second control valve 10, and a storage tank 84 are also installed inside the light box 2.

[0071] The above-mentioned technical solution has the following advantages:

[0072] 1. This system can monitor in real time whether the filter device on the bus stop sign is clogged and needs dust removal. When a clog is detected, the dust removal system is automatically activated, which can effectively ensure the air intake of the bus stop sign's heat dissipation system, avoid aging and damage to the electrical components inside the bus stop sign due to excessive temperature rise, and extend the service life of the electrical components of the bus stop sign.

[0073] 2. This system uses a wet dust removal method, which mixes the dust and water collected during sweeping to form muddy water, which is then discharged into flower beds or sewers. This avoids secondary pollution and achieves the goal of green and environmentally friendly emissions. It also avoids the need for manual dust removal, saving manpower.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An automatic dust removal system for bus stop signs, comprising a filter device installed at the ventilation opening, characterized in that, Also includes: A clogging detection device is used to detect the clogging status of the filter device; A dust removal and cleaning device is installed on the filter device to clean the dust on the filter device and collect and transport it to the filter discharge device; The filtration and discharge device is connected to the dust removal and cleaning device through an air duct, and is used to mix the collected dust with water to form muddy water and discharge it. The controller, connected to the blockage detection device, dust removal and cleaning device, and filter discharge device, is configured to activate the dust removal and cleaning device when the blockage condition reaches a set condition and to discharge mud and water when the filter discharge device reaches the discharge target.

2. The automatic dust removal system for bus stop signs according to claim 1, characterized in that: The blockage detection device includes an airflow detection device for detecting the ventilation volume of the filter device. The controller determines the blockage status of the filter device based on whether the detected ventilation volume meets the set conditions.

3. The automatic dust removal system for bus stop signs according to claim 1, characterized in that: The dust removal and cleaning device includes a cleaning device, a drive mechanism, an air duct, and a dust removal fan. The cleaning device is installed on the filter device. The drive mechanism is connected to the cleaning device and drives the cleaning device to move back and forth along the filter device. One end of the air duct is connected to the cleaning device, and the other end of the air duct is connected to the filter discharge device. The dust removal fan is installed on the air duct.

4. The automatic dust removal system for bus stop signs according to any one of claims 1-3, characterized in that: The filtration and discharge device includes a filter container, a discharge device connected to the filter container, and a water supply system. The filter container is connected to a dust removal and cleaning device through a duct. The dust collected during cleaning is collected in the filter container. Water is injected into the filter container by the water supply system. The collected dust and water mix in the filter container to form muddy water, which is then discharged by the discharge device.

5. The automatic dust removal system for bus stop signs according to claim 4, characterized in that: The water supply system includes a rainwater collector and / or an external water source. The rainwater collector and the external water source are connected to the filter container via pipelines. A first control valve is connected in series on the pipeline between the rainwater collector and the filter container, and a second control valve is connected in series on the pipeline between the external water source and the filter container. The first and second control valves are connected to the controller.

6. The automatic dust removal system for bus stop signs according to claim 5, characterized in that: A storage tank is provided at the water inlet of the filter container. The rainwater collector and the external water source are connected to the storage tank through pipelines. The storage tank is connected to the filter container through a drain pipeline. A third control valve is connected in series on the drain pipeline and is connected to the controller.

7. The automatic dust removal system for bus stop signs according to claim 4, characterized in that: The filter container is connected to an exhaust device, through which filtered clean air is discharged and blown toward the electrical control box inside the bus stop sign.

8. The automatic dust removal system for bus stop signs according to claim 7, characterized in that: A partition is installed inside the box of the bus stop sign to form a space. An electrical control box is installed in the space. The exhaust device includes an exhaust pipe connected to a filter container and an exhaust port set on the partition. The exhaust pipe is connected to the exhaust port, and the filtered clean air is blown to the electrical control box through the exhaust pipe and the exhaust port.

9. The automatic dust removal system for bus stop signs according to claim 4, characterized in that: An automatic stirrer is installed inside the filter container.

10. A smart bus stop sign, characterized in that: The bus stop sign is equipped with an automatic dust removal system as described in any one of claims 1-9.

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