Passive street lamp cleaning device

Abstract

The invention discloses a passive street lamp cleaning device which is of a split type annular structure, two semicircular rings are spliced into a complete circular ring through bolts or a clamping structure, and the complete circular ring is arranged outside a lamp pole in a sleeving mode. And a jet cleaning module, a rotary scrubbing module, an anti-splashing module and a waste water recycling module are integrated on the circular ring. The jet cleaning module comprises a high-pressure water supply port and a plurality of high-pressure nozzles arranged in the circumferential direction. The rotary brushing module comprises an annular mounting panel which is driven by a stepping motor and can rotate in a reciprocating mode, and an annular brush which is driven by a brushless motor and is pressed against the surface of the lamp pole in a self-adaptive mode through a spring pressing mechanism. The anti-splashing module is composed of a sealing cover formed by splicing a plurality of sections of flexible rubber sheets. And the wastewater recovery module comprises a recovery tank with magnetic stripe adsorption, a Venturi tube type vacuum water suction device and a vacuum pump. The device is dragged by a winch to lift and is controlled by a distributed control system to realize automatic cleaning operation.

Description

Technical Field

[0001] This invention belongs to the field of municipal cleaning equipment technology, and in particular relates to a passive street light cleaning device. Background Technology

[0002] Currently, the cleaning of municipal streetlights mainly relies on manual labor or semi-automatic equipment. Manual cleaning requires working at heights, posing significant safety hazards; semi-automatic equipment generally lacks adaptability to light poles of different diameters, resulting in insufficient cleaning coverage and blind spots; furthermore, existing equipment lacks an effective wastewater recycling mechanism, easily causing environmental pollution. Therefore, there is an urgent need for a cleaning device with a reasonable structure, capable of automated operation and wastewater recycling function. Summary of the Invention

[0003] The purpose of this invention is to provide a passive street light cleaning device, which uses two semi-circular ring structures joined together to form a circular ring, combining functions such as spray cleaning, reciprocating brushing, adaptive pressing, anti-splashing and wastewater recycling to achieve comprehensive, efficient and safe cleaning of light poles.

[0004] To solve the above-mentioned technical problems, the specific technical solution of the present invention is as follows:

[0005] In some embodiments of this application, a passive street light cleaning device is provided, comprising a first semi-circular ring structure and a second semi-circular ring structure, characterized in that:

[0006] The first semi-circular ring structure and the second semi-circular ring structure are respectively provided with a splicing and fixing structure. The splicing and fixing structure is a bolt connection pair or a matching structure of a snap-fit ​​protrusion and a snap-fit ​​groove.

[0007] The first and second semi-circular ring structures are combined to form a complete ring.

[0008] The inner ring surface of the ring is provided with a spray cleaning module, a rotating brush cleaning module, an anti-splash module and a wastewater recycling module along the circumferential direction;

[0009] The jet cleaning module includes a high-pressure water supply channel opened in the annular wall, a high-pressure water supply port connected to the high-pressure water supply channel, and multiple high-pressure nozzles connected to the high-pressure water supply channel and pointing towards the center of the annular wall.

[0010] The rotary brushing module includes a ring-shaped mounting panel, a stepper motor, a gear transmission mechanism, and at least one rotary brush unit.

[0011] The annular mounting panel is connected to the ring via a bearing;

[0012] The stepper motor is fixedly mounted on the ring, and its output shaft meshes with a gear ring located on the outer edge of the annular mounting panel through the gear transmission mechanism.

[0013] The rotary brush unit includes a brushless motor, a rotary brush support rod, a spring clamping mechanism, and a ring-shaped brush.

[0014] One end of the rotating brush support rod is hinged to the housing of the brushless motor, and the other end passes through the guide groove on the annular mounting panel. The spring clamping mechanism is located between the housing of the brushless motor and the annular mounting panel. The annular brush is coaxially fixedly mounted on the output shaft of the brushless motor.

[0015] The splash-proof module includes multiple arc-shaped flexible rubber sealing covers. Each segment of the flexible rubber sealing cover is spliced ​​together in sequence through plugs or overlaps at both ends to form a complete annular cover. The inner edge of the annular cover extends toward the central axis of the ring.

[0016] The wastewater recycling module includes an annular wastewater recycling tank, a magnetic strip adsorption device, a vacuum water suction device, a wastewater discharge outlet, and a vacuum pump.

[0017] The annular wastewater recycling tank is located inside the ring and below the annular cover of the anti-splash module, with its opening facing upwards;

[0018] The magnetic strip adsorption device is located at the bottom of the annular wastewater recovery tank;

[0019] The suction port of the vacuum water suction device is located inside the annular wastewater recovery tank, and its outlet is connected to the wastewater discharge outlet through a pipe. The suction port of the vacuum pump is connected to the vacuum chamber of the vacuum water suction device through a pipe.

[0020] In some embodiments of this application, the guide groove is an elongated through hole or blind groove extending radially along the annular mounting panel.

[0021] In some embodiments of this application, the spring clamping mechanism includes a guide rod and a compression spring fitted on the guide rod. One end of the guide rod is connected to the housing of the brushless motor, and the other end slides through the annular mounting panel.

[0022] In some embodiments of this application, the gear transmission mechanism includes a driving gear fixedly mounted on the output shaft of the stepper motor and a driven gear meshing with the driving gear, the driven gear meshing with a gear ring on the outer edge of the annular mounting panel.

[0023] In some embodiments of this application, the plug is a male thread and the overlapping part is a female groove that is interference-fitted with the male thread.

[0024] In some embodiments of this application, the cross-section of the annular wastewater recovery tank is U-shaped or V-shaped.

[0025] In some embodiments of this application, the vacuum water suction device is a Venturi tube structure.

[0026] In some embodiments of this application, a winch is also included, the winch cable being connected to a suspension point on the ring.

[0027] In some embodiments of this application, a distributed control system is also included, the distributed control system including a ground control unit and an airborne control unit disposed on the ring, the ground control unit and the airborne control unit being connected via a wireless communication module;

[0028] The output terminal of the airborne control unit is electrically connected to the control terminals of the stepper motor, brushless motor, and vacuum pump.

[0029] Some embodiments of this application disclose a street light cleaning method using the aforementioned passive street light cleaning device, the method comprising:

[0030] The first semi-circular ring structure and the second semi-circular ring structure are fitted around the outside of the street light pole and fixed by the splicing and fixing structure;

[0031] Start the winch to lower the cleaning device along the lamppost;

[0032] During the descent, high-pressure fluid enters the high-pressure water supply channel through the high-pressure water supply port and is sprayed onto the surface of the lamp post by the high-pressure nozzle;

[0033] The stepper motor drives the annular mounting panel to reciprocate in both directions through the gear transmission mechanism.

[0034] The brushless motor drives the annular brush to rotate around its own axis.

[0035] The spring clamping mechanism pushes the brushless motor and the annular brush to move toward the surface of the lamp post;

[0036] When the vacuum pump is started, a negative pressure is generated in the annular wastewater recovery tank, and the cleaned wastewater is sucked into the vacuum suction device and discharged through the wastewater outlet.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] By employing a split-type ring-shaped main body composed of two semi-circular rings joined and fixed together, the device can be quickly installed and disassembled on the outside of the light pole without the need for special tools, simplifying operation and greatly improving work efficiency. Simultaneously, this open structure makes it suitable for light pole scenarios with various heights and obstacles, offering strong versatility. The device utilizes a composite motion scheme—a stepper motor driving the ring mounting panel for reciprocating rotation and a brushless motor driving the ring brush for high-speed rotation—combined with a spring-loaded clamping mechanism, allowing the brush to adaptively conform to light pole surfaces of different diameters. This integrated design enhances the device's overall functionality. It incorporates three motion modes: revolution, rotation, and radial floating, enabling comprehensive and efficient 360° cleaning of the lamp post surface without any blind spots. The cleaning effect is significantly better than devices with a single motion mode. Furthermore, the rotating brushing module is equipped with a rotating brush support rod with guide grooves and a spring clamping mechanism, allowing each annular brush to move independently along the radial direction of the lamp post while maintaining a constant clamping force. This ensures that the device is compatible not only with cylindrical lamp posts of different diameters but also with lamp posts that have a certain taper or uneven surface, maintaining effective contact and ensuring uniform and stable cleaning. By incorporating a splash-proof module composed of multiple flexible rubber sealing covers and a wastewater recovery module consisting of a vacuum pump, a venturi tube, and a magnetic adsorption recovery tank, the wastewater and splashed cleaning fluid generated during the cleaning process are effectively sealed and collected, and centrally discharged for treatment. This completely avoids secondary pollution of the surrounding soil, vegetation, and environment by chemical cleaning fluids, achieving green and environmentally friendly operations. The use of a winch lifting device and a distributed control system allows operators to remotely control the entire cleaning process (including start / stop, lifting, spraying, brushing, and recovery) from the ground, completely eliminating manual work at heights and fundamentally removing the safety risk of falls from heights, significantly reducing labor intensity and operating costs. By highly integrating the four functional modules of spraying, brushing, sealing, and recovery into a single ring-shaped main body, with each module organically combined through a mechanical structure and a clear transmission path, the overall machine structure is compact and reasonable, with coordinated and reliable movement, a low failure rate, and a long service life. Attached Figure Description

[0039] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0040] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of two semicircular rings combined into a circular ring according to an embodiment of the present invention;

[0042] Figure 3This is a schematic diagram of the jet cleaning module structure provided in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the rotating brush cleaning module structure provided in an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the installation structure of the rotating brush cleaning module provided in an embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of the annular mounting panel structure provided in an embodiment of the present invention;

[0046] Figure 7 This is a schematic diagram of the spring mechanism structure of the rotating brush cleaning module provided in an embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the rotating brush support rod structure provided in an embodiment of the present invention;

[0048] Figure 9 This is a schematic diagram of a ball drive structure provided in an embodiment of the present invention;

[0049] Figure 10 A schematic diagram of a single-segment flexible rubber sealing cover structure provided for an embodiment of the invention;

[0050] Figure 11 A schematic diagram of the wastewater recycling module provided in the embodiments of the invention;

[0051] Figure 12 A schematic diagram of the operation process of the street light cleaning device provided in the embodiment of the invention. Detailed Implementation

[0052] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0053] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0054] Example 1

[0055] See appendix Figures 1-11 The present invention includes a spray cleaning module 1, a rotating brush cleaning module 2, an anti-splash module 3, and a wastewater recycling module 4.

[0056] The semi-circular ring structure 5 is assembled on the surface of the lamp post by bolts or snap-fit ​​components of the splicing and fixing structure 15 to form a complete ring.

[0057] The spray cleaning module 1 includes a high-pressure water supply port 7 and several high-pressure nozzles 6, which are used to rinse the surface of the lamp post.

[0058] The rotary brush cleaning module 2 includes a brushless motor 10, a stepper motor 18, a gear transmission 17, an annular mounting panel 9, a guide groove 16, a rotary brush support rod 19, a spring clamping mechanism 11, and an annular brush 12.

[0059] The stepper motor 18 drives the ring mounting panel 9 to reciprocate, thereby driving the rotating brush support rod 19 and the ring brush 12 to reciprocate for cleaning.

[0060] The brushless motor 10 independently drives the annular brush 12 to rotate, enhancing the brushing effect;

[0061] The spring clamping mechanism 11 ensures that the annular brush 12 maintains an adaptive fit on the surface of lamp posts of different diameters.

[0062] The anti-splash module 3 includes a multi-segment flexible rubber sealing cover 13 composed of several flexible rubber sheets spliced ​​together. The rubber sheets are connected by insertion or overlap to form an annular sealing cavity, which can be flexibly adapted to different lamp post diameters.

[0063] The wastewater recycling module 4 includes a magnetic strip adsorption device 20, a vacuum water suction device 21, a wastewater discharge outlet 14, and a vacuum pump 22, which are used to collect wastewater and introduce it into a recycling container for preliminary purification through a filtration and separation device.

[0064] The winch drives the entire device to rise and fall along the lamppost, and the distributed control system enables remote operation and automated cleaning.

[0065] Example 2

[0066] The following combination Figures 1 to 11 The specific embodiments of the present invention will be described in detail below. These embodiments are not intended to limit the scope of the invention.

[0067] See Figure 1 and Figure 2 This invention provides a preferred embodiment of a passive street light cleaning device, which adopts a split-ring structure. It mainly consists of two symmetrical semi-circular ring structures 5 joined together by a splicing and fixing structure 15 to form a complete ring. The splicing and fixing structure 15 is a common bolt connection in the art, but a matching structure of a snap-fit ​​protrusion and a snap-fit ​​groove (not shown in the diagram) can also be used. This ring is fitted onto the outside of the street light pole, and a spray cleaning module 1, a rotating brush cleaning module 2, a splash-proof module 3, and a wastewater recovery module 4 are integrated along its circumference.

[0068] The jet cleaning module 1 is referred to Figure 3It includes a high-pressure water supply channel (not shown in the diagram) located inside the annular wall, a high-pressure water supply port 7 located on the outer wall of the annulus, and multiple high-pressure nozzles 6 evenly arranged circumferentially along the inner wall of the annulus. The high-pressure water supply port 7 is connected to the high-pressure water supply channel and is used to connect to an external high-pressure water source; the high-pressure nozzles 6 are also connected to the high-pressure water supply channel, and their nozzles point towards the central axis of the annulus.

[0069] The rotary brushing module 2 is referred to Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 This is one of the core modules of the present invention. It includes a ring-shaped mounting panel 9, a stepper motor 18, a gear transmission mechanism 17, and three rotating brush units evenly distributed along the circumference.

[0070] The annular mounting panel 9 is connected to the main ring via a deep groove ball bearing (not shown in the diagram), allowing it to rotate freely relative to the main ring. The stepper motor 18 is fixedly mounted on the main ring via a motor mount, and a drive gear is fixedly mounted on its output shaft. The gear transmission mechanism 17 also includes a driven gear meshing with the drive gear, which meshes with a gear ring machined on the outer edge of the annular mounting panel 9. Thus, the forward and reverse rotation of the stepper motor 18 can be converted into the forward and reverse reciprocating rotation of the annular mounting panel 9 through the gear pair.

[0071] Each of the rotary brush units includes a brushless motor 10, a rotary brush support rod 19, a spring clamping mechanism 11, and an annular brush 12. One end of the rotary brush support rod 19 is hinged to the housing of the brushless motor 10 via a pin, and the other end passes through a radial guide groove 16 formed on the annular mounting panel 9. The spring clamping mechanism 11 specifically includes a guide rod and a compression spring fitted on the guide rod. One end of the guide rod is fixedly connected to the housing of the brushless motor 10, and the other end slides through the annular mounting panel 9. One end of the compression spring abuts against the housing of the brushless motor 10, and the other end abuts against the annular mounting panel 9, thereby continuously providing a clamping force pointing towards the central axis of the annular ring to the brushless motor 10 and the brush 12. The annular brush 12 is coaxially fixedly fitted on the output shaft of the brushless motor 10 and is directly driven by the brushless motor 10 to rotate at high speed.

[0072] The anti-splash module 3 is described below. Figure 10It includes a complete annular cover composed of four identical arc-shaped flexible rubber sealing covers 13 spliced ​​together. Each sealing cover 13 has a male buckle and a female groove at both ends (not shown in the diagram). The four sealing cover 13 are connected end to end by inserting the male buckle of one section into the female groove of the adjacent section. The inner diameter of the annular cover is slightly smaller than the diameter of the target lamp post, and it adheres tightly to the surface of the lamp post by the elastic deformation of the rubber, forming a localized closed cleaning space.

[0073] The wastewater recycling module 4 is referred to Figure 11 The system includes an annular wastewater recovery tank located directly below the anti-splash module 3, a magnetic strip adsorption device 20, a vacuum water suction device 21, a wastewater discharge outlet 14, and a vacuum pump 22. The annular wastewater recovery tank has a V-shaped cross-section to facilitate wastewater collection. Two permanent magnet magnetic strip adsorption devices 20 are embedded in the bottom of the recovery tank to adsorb and fix the entire recovery module to the metal lamp post. The vacuum water suction device 21 is a Venturi tube structure, with its suction inlet located at the lowest point of the recovery tank and its outlet connected to the wastewater discharge outlet 14 via a pipe. The exhaust port of the vacuum pump 22 is connected to the working fluid inlet of the Venturi tube via a pipe. By drawing air, a negative pressure is generated at the suction inlet of the Venturi tube, thereby drawing in and discharging wastewater.

[0074] The working principle and process of this invention are as follows (see below) Figure 12 :

[0075] First, the two semi-circular ring structures 5 are joined together at the top of the streetlight pole and secured with bolts to complete the installation. The ground control system starts the winch, releases the cable, and the device begins to descend at a constant speed along the streetlight pole under the influence of gravity.

[0076] During descent, an external high-pressure water pump starts, and cleaning fluid enters through the high-pressure water supply port 7 and is sprayed out from the high-pressure nozzle 6 to pre-wet and rinse the surface of the lamp post. Simultaneously, a stepper motor 18 starts, driving the annular mounting panel 9 and all its rotating brush units to perform a slow reciprocating rotation. A brushless motor 10 starts at the same time, driving the annular brush 12 to rotate at high speed. Under the action of the spring clamping mechanism 11, the brush 12 remains in close contact with the lamp post surface, achieving efficient cleaning. A splash-proof sealing cover 13 seals the cleaning area, blocking splashed liquid. Wastewater mixed with dirt flows into the annular wastewater recovery tank below under gravity. A vacuum pump 22 starts, generating negative pressure at the suction port of the vacuum suction device 21, rapidly drawing in the wastewater and discharging it through a pipe from the wastewater discharge port 14 to a collection container on the ground. This process repeats until the device descends to the bottom of the lamp post, completing one cleaning operation.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. For example, the flexible sealing cover 13 can also adopt an integrally formed corrugated pipe structure; the magnetic strip adsorption device 20 can also be replaced by a vacuum suction cup; the spring pressing mechanism 11 can also be replaced by a cylinder. These modifications all fall within the protection scope of the present invention.

[0078] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "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 application 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 limitations on this application.

[0079] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0080] In the description of this application, it should be noted that, unless otherwise expressly 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0081] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0082] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A passive street light cleaning device, comprising a first semi-circular ring structure (5) and a second semi-circular ring structure (5), characterized in that: The first semi-circular ring structure (5) and the second semi-circular ring structure (5) are respectively provided with splicing and fixing structures (15), and the splicing and fixing structures (15) are bolt connection pairs or matching structures of snap-fit ​​protrusions and snap-fit ​​grooves. The first semi-circular ring structure (5) and the second semi-circular ring structure (5) are combined to form a complete ring; The inner ring surface of the ring is provided with a jet cleaning module (1), a rotating brush cleaning module (2), an anti-splash module (3) and a wastewater recovery module (4) along the circumferential direction; The jet cleaning module (1) includes a high-pressure water supply channel opened in the annular wall, a high-pressure water supply port (7) connected to the high-pressure water supply channel, and multiple high-pressure nozzles (6) connected to the high-pressure water supply channel and pointing to the center of the annular wall. The rotary brushing module (2) includes a ring-shaped mounting panel (9), a stepper motor (18), a gear transmission mechanism (17), and at least one rotary brush unit; The annular mounting panel (9) is connected to the ring via a bearing; The stepper motor (18) is fixedly mounted on the ring, and its output shaft meshes with the gear ring located on the outer edge of the annular mounting panel (9) through the gear transmission mechanism (17); The rotating brush unit includes a brushless motor (10), a rotating brush support rod (19), a spring clamping mechanism (11), and an annular brush (12); One end of the rotating brush support rod (19) is hinged to the housing of the brushless motor (10), and the other end passes through the guide groove (16) on the annular mounting panel (9). The spring clamping mechanism (11) is located between the housing of the brushless motor (10) and the annular mounting panel (9). The annular brush (12) is coaxially fixedly mounted on the output shaft of the brushless motor (10). The anti-splash module (3) includes multiple arc-shaped flexible rubber sealing covers (13). Each segment of the flexible rubber sealing cover (13) is sequentially spliced ​​together by the plugs or overlaps at both ends to form a complete annular cover. The inner edge of the annular cover extends toward the central axis of the ring. The wastewater recycling module (4) includes an annular wastewater recycling tank, a magnetic strip adsorption device (20), a vacuum water suction device (21), a wastewater discharge outlet (14), and a vacuum pump (22); The annular wastewater recycling tank is located inside the annular ring and below the annular cover of the anti-splash module (3), with its opening facing upwards; The magnetic strip adsorption device (20) is located at the bottom of the annular wastewater recycling tank; The suction port of the vacuum water suction device (21) is located in the annular wastewater recovery tank, and its outlet is connected to the wastewater discharge outlet (14) through a pipe. The suction port of the vacuum pump (22) is connected to the vacuum chamber of the vacuum water suction device (21) through a pipe.

2. The passive street light cleaning device according to claim 1, characterized in that: The guide groove (16) is an elongated through hole or blind groove extending radially along the annular mounting panel (9).

3. The passive street light cleaning device according to claim 1 or 2, characterized in that: The spring clamping mechanism (11) includes a guide rod and a compression spring fitted on the guide rod. One end of the guide rod is connected to the housing of the brushless motor (10), and the other end slides through the annular mounting panel (9).

4. The passive street light cleaning device according to claim 1, characterized in that: The gear transmission mechanism (17) includes a drive gear fixedly mounted on the output shaft of the stepper motor (18) and a driven gear meshing with the drive gear. The driven gear meshes with the gear ring on the outer edge of the annular mounting panel (9).

5. The passive street light cleaning device according to claim 1, characterized in that: The plug is a male connector, and the lap joint is a female groove that is interference-fitted with the male connector.

6. The passive street light cleaning device according to claim 1, characterized in that: The cross-section of the annular wastewater recovery tank is U-shaped or V-shaped.

7. The passive street light cleaning device according to claim 1, characterized in that: The vacuum water suction device (21) has a venturi tube structure.

8. The passive street light cleaning device according to claim 1, characterized in that: It also includes a winch, the cable of which is connected to a suspension point on the ring.

9. The passive street light cleaning device according to claim 1, characterized in that: It also includes a distributed control system, which includes a ground control unit and an airborne control unit disposed on the ring, and the ground control unit and the airborne control unit are connected through a wireless communication module. The output terminal of the airborne control unit is electrically connected to the control terminals of the stepper motor (18), brushless motor (10), and vacuum pump (22).

10. A street light cleaning method, employing the passive street light cleaning device as described in any one of claims 1 to 9, characterized in that, The method includes: The first semi-circular ring structure (5) and the second semi-circular ring structure (5) are attached to the outside of the street lamp pole and fixed by the splicing and fixing structure (15); Start the winch to lower the cleaning device along the lamppost; During the descent, the high-pressure fluid enters the high-pressure water supply channel through the high-pressure water supply port (7) and is sprayed onto the surface of the lamp post by the high-pressure nozzle (6); The stepper motor (18) drives the annular mounting panel (9) to reciprocate in both directions through the gear transmission mechanism (17); The brushless motor (10) drives the annular brush (12) to rotate around its own axis; The spring clamping mechanism (11) pushes the brushless motor (10) and the annular brush (12) to move towards the surface of the lamp post; The vacuum pump (22) is started, generating negative pressure in the annular wastewater recovery tank. The cleaned wastewater is sucked into the vacuum water suction device (21) and discharged through the wastewater outlet (14).

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