Self-cleaning device, dust removal system and road sweeper

Abstract

The application discloses a self-cleaning device, a dust removal system and a road sweeper. The self-cleaning device comprises a shell assembly, an inner shell assembly and a cleaning assembly. The shell assembly is provided with a negative pressure cavity and a suction port communicated with the negative pressure cavity. The inner shell assembly is sleeved in the shell assembly and is retractable along the axial direction of the shell assembly between a first position and a second position. The inner cavity of the inner shell assembly is communicated with the negative pressure cavity. The peripheral wall of the inner shell assembly is provided with filter screen holes. The filter screen holes are exposed outside the shell assembly when the inner shell assembly is in the first position. The inner shell assembly is retracted into the shell assembly relative to the first position when the inner shell assembly is in the second position. The cleaning assembly is connected with the shell assembly and is arranged to move along the peripheral surface of the inner shell assembly to clean the filter screen holes when the inner shell assembly moves between the first position and the second position. The inner shell assembly of the self-cleaning device is retractable in the shell assembly, the filter screen holes of the inner shell assembly are cleaned by the cleaning assembly, and the self-cleaning function is realized.

Description

Technical Field

[0001] This application relates to the field of waste disposal technology, and in particular to a self-cleaning device, a dust removal system having the self-cleaning device, and a road sweeper having the dust removal system. Background Technology

[0002] In related technologies, small and medium-sized sweepers are mainly divided into dry-type drum sweepers and wet-type box sweepers. Both dry-type and wet-type box sweepers suffer from difficult dust cleaning. In dry-type drum sweepers, when the vibrating plate rotates horizontally, it only causes a slight sway below the filter bag; the dust and debris adhering to the top of the filter bag cannot be removed and requires daily manual cleaning. Otherwise, blockage in the dust collection box will severely reduce the sweeper's suction power, wasting time and effort. Wet-type box sweepers typically lack a separate dust cleaning mechanism in the garbage bin, and the space is narrow, making manual operation difficult. When the air outlet is blocked, the garbage becomes extremely difficult to clean. Summary of the Invention

[0003] One objective of this application is to provide a self-cleaning device that achieves self-cleaning functionality by comprising an inner shell assembly, an outer shell assembly, and a cleaning assembly.

[0004] Another objective of this application is to provide a dust removal system, including the aforementioned self-cleaning device.

[0005] Another object of this application is to provide a road sweeper that includes the aforementioned dust removal system.

[0006] A self-cleaning device according to an embodiment of this application includes a housing assembly, an inner housing assembly, and a cleaning assembly. The housing assembly has a negative pressure chamber and an air extraction port communicating with the negative pressure chamber. The inner housing assembly is sleeved inside the housing assembly and is extendable and retractable along the axial direction of the housing assembly between a first position and a second position. The inner cavity of the inner housing assembly communicates with the negative pressure chamber. A filter screen is provided on the peripheral wall of the inner housing assembly, communicating with the inner cavity of the inner housing assembly. When the inner housing assembly is in the first position, the filter screen is exposed in the housing assembly to filter the airflow leading to the air extraction port. When the inner housing assembly is in the second position, the inner housing assembly retracts into the housing assembly relative to the first position. The cleaning assembly is connected to the housing assembly and is configured such that when the inner housing assembly moves between the first position and the second position, the cleaning assembly moves along the peripheral wall of the inner housing assembly to clean the filter screen.

[0007] According to the self-cleaning device of this application embodiment, the inner shell assembly is retractable and movable within the outer shell assembly. During the movement, the cleaning component cleans the filter mesh of the inner shell assembly, thereby achieving the self-cleaning function.

[0008] In addition, the self-cleaning device according to the above embodiments of this application may also have the following additional technical features:

[0009] Optionally, the cleaning component includes a scraper ring that extends circumferentially along the housing assembly. The outer periphery of the scraper ring is fixedly connected to the housing assembly, and the inner periphery of the scraper ring abuts against the outer peripheral surface of the inner housing assembly. When the inner housing assembly moves between the first position and the second position, the inner periphery of the scraper ring moves along the outer peripheral surface of the inner housing assembly to clean the filter mesh.

[0010] Optionally, the scraper ring is inclined in a predetermined direction from the outer periphery to the inner periphery, and the predetermined direction is the direction in which the inner shell assembly is inclined from the second position to the first position; when the inner shell assembly is in the first position, the portion of the inner shell assembly with filter mesh holes extends out of the scraper ring.

[0011] Optionally, the cleaning assembly further includes a sweeping ring that extends circumferentially along the outer shell assembly. The sweeping ring includes a retaining ring and a brush disposed on the retaining ring. The retaining ring is fixedly connected to the outer shell assembly, and the brush is disposed on the retaining ring and abuts against the outer peripheral surface of the inner shell assembly. When the inner shell assembly moves between the first position and the second position, the brush moves along the outer peripheral surface of the inner shell assembly to clean the filter mesh.

[0012] Optionally, the self-cleaning device further includes a damping element configured to apply an elastic thrust to the inner shell assembly to move the inner shell assembly toward the first position.

[0013] The self-cleaning device further includes a housing and a piston, the housing being fixedly connected to the outer shell assembly; the piston is movably fitted inside the housing, and the piston is fixedly connected to the inner shell assembly.

[0014] Optionally, the outer shell assembly includes a first cylindrical body and an end plate, the end plate being disposed at one end of the first cylindrical body and the other end of the first cylindrical body being open, the air extraction port being disposed on the end plate, the inner shell assembly being sleeved inside the first cylindrical body, and the inner shell assembly extending from the other end of the first cylindrical body at the first position.

[0015] Optionally, the inner shell assembly includes a second cylinder, a filter screen, and a pressure valve. The second cylinder is fitted inside the outer shell assembly. One end of the first cylinder is close to the air extraction port and is open. The filter screen is located on the other end of the first cylinder away from the end plate. The pressure valve is located inside the filter screen and can be switched between opening and closing the filter screen. The opening pressure of the pressure valve is greater than the damping of the inner shell assembly moving from the first position to the second position. The filter screen holes are located on the second cylinder adjacent to the end of the filter screen.

[0016] Optionally, the inner shell assembly is provided with a roller, and the inner circumferential surface of the outer shell assembly is provided with a sliding groove that rolls with the roller. The sliding groove extends along the axial direction of the outer shell assembly, and the roller rolls along the sliding groove when the inner shell assembly moves between the first position and the second position.

[0017] Optionally, the inner shell assembly includes a second cylinder, a mounting bracket, and a connecting bracket. The second cylinder has a notch on its peripheral wall. The mounting bracket is located inside the second cylinder and is fixedly connected to it. The mounting bracket is U-shaped with its opening facing the notch. The first end of the connecting bracket is connected to the mounting bracket, and the second end extends downward toward the notch. The roller is rotatably connected to the second end of the connecting bracket. A portion of the roller is located inside the second cylinder, and another portion extends through the notch to the outer peripheral surface of the second cylinder. The peripheral wall of the second cylinder has multiple notches, and these multiple notches are arranged circumferentially along the second cylinder.

[0018] Optionally, at least one of the top and bottom of the chute is provided with a roller limiting structure for limiting the inner shell assembly.

[0019] A dust removal system according to an embodiment of this application includes: a dust collection bin, a housing, a suction nozzle device, a cleaning component and an extraction device as described above. The housing covers the dust collection bin and has an air inlet. The suction nozzle device is connected to the housing and communicates with the air inlet. A self-cleaning device is disposed in the housing and connected to the housing. The extraction device is connected to the housing and communicates with the extraction port. The extraction device drives airflow from the suction nozzle device into the housing and the dust collection bin, and after being filtered through the filter mesh, it is discharged from the extraction device.

[0020] The road sweeper according to the embodiments of this application includes the aforementioned dust removal system.

[0021] Additional aspects and advantages of this application will be set forth in the description which follows, and in some respects will be obvious from the description or may be learned by practice of this application. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a self-cleaning device according to an embodiment of this application.

[0023] Figure 2 This is an exploded schematic diagram of a self-cleaning device according to an embodiment of this application.

[0024] Figure 3 This is a schematic diagram of the housing assembly of the self-cleaning device according to an embodiment of this application.

[0025] Figure 4 This is an exploded view of a self-cleaning device according to an embodiment of this application, in which the inner shell assembly and the outer shell assembly are hidden.

[0026] Figure 5 This is a schematic diagram of the housing assembly and cleaning assembly of the self-cleaning device according to an embodiment of this application.

[0027] Figure 6 This is a schematic diagram of the inner shell assembly of the self-cleaning device according to an embodiment of this application.

[0028] Figure 7 This is a schematic diagram of the inner shell assembly of the self-cleaning device according to an embodiment of this application.

[0029] Figure 8 This is an exploded view of the inner shell assembly of the self-cleaning device according to an embodiment of this application.

[0030] Figure 9 yes Figure 8 A magnified view of a portion of area A in the middle circle.

[0031] Figure 10 This is an exploded view of the cleaning component of the self-cleaning device according to an embodiment of this application.

[0032] Figure 11 This is a schematic diagram of the self-cleaning device in a first position according to an embodiment of this application.

[0033] Figure 12 This is a schematic diagram showing the direction of movement of the self-cleaning device from the first position to the second position according to an embodiment of this application.

[0034] Figure 13 This is a schematic diagram of the self-cleaning device of an embodiment of this application in a second position.

[0035] Figure 14 This is a schematic diagram of the self-cleaning device in a second position according to an embodiment of this application, wherein the pressure valve is open.

[0036] Figure 15 This is a schematic diagram of the housing of a dust removal system according to an embodiment of this application.

[0037] Figure 16 This is a schematic diagram of the housing and self-cleaning device of the dust removal system according to an embodiment of this application.

[0038] Figure 17 This is a schematic diagram of a road sweeper according to an embodiment of this application.

[0039] Figure 18 This is a schematic diagram of the airflow direction of the sweeper according to an embodiment of this application.

[0040] Figure 19 This is a schematic diagram of the open state of the sweeper housing according to an embodiment of this application.

[0041] Figure 20 This is a schematic diagram from another direction showing the open state of the sweeper housing in an embodiment of this application.

[0042] Figure label:

[0043] Self-cleaning device 100, outer shell assembly 10, negative pressure chamber 11, air extraction port 12, first cylinder 13, end plate 14, slide groove 15, inner shell assembly 20, filter screen 21, second cylinder 22, filter screen 23, roller 24, pressure valve 26, mounting bracket 27, connecting bracket 28, cleaning component 30, scraper ring 31, sweeping ring 32, fixing ring 321, brush 322, pressure ring 34, housing 40, water inlet 51, piston 52, damping component 53, water spray component 54, water spray frame 55, nozzle 56, water inlet pipe 57, one-way valve 58, filter 59, dust collection bin 200, box 300, air inlet 301, suction device 400, air extraction device 500, road sweeper 1000. Detailed Implementation

[0044] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0045] Reference Figure 1 , Figure 2 , Figures 13 to 14This application provides a self-cleaning device 100, which includes a housing assembly 10, an inner housing assembly 20, and a cleaning assembly 30. The housing assembly 10 has a negative pressure chamber 11 and an air extraction port 12 communicating with the negative pressure chamber 11. Air extraction through the air extraction port 12 can generate negative pressure within the housing assembly 10. The inner housing assembly 20 is sleeved within the housing assembly 10 and is extendable and retractable along the axial direction of the housing assembly 10 between a first position and a second position. The inner cavity of the inner housing assembly 20 communicates with the negative pressure chamber 11. The outer shell assembly 100 has a filter screen 21 on its peripheral wall that communicates with the inner cavity of the inner shell assembly 20. When the inner shell assembly 20 is in the first position, the filter screen 21 is exposed to filter the airflow to the air intake 12. When the inner shell assembly 20 is in the second position, it retracts into the outer shell assembly 10 relative to the first position. The cleaning assembly 30 is connected to the outer shell assembly 10 and is configured such that when the inner shell assembly 20 moves between the first and second positions, the cleaning assembly 30 moves along the peripheral wall of the inner shell assembly 20 to clean the filter screen 21. Therefore, in the outer shell assembly 10, when the outer shell assembly 20 moves from the first position to the second position, the cleaning assembly 30 can complete the cleaning of the inner shell assembly 20, realizing the self-cleaning function of the self-cleaning device 100.

[0046] In the second position, the inner shell assembly 20 retracts into the outer shell assembly 10 relative to the first position. In other words, when the inner shell assembly 20 is in the first position, the filter mesh 21 on the inner shell assembly 20 can be exposed to the outer shell assembly 10 so that airflow can pass through the filter mesh 21. When the inner shell assembly 20 moves from the first position to the second position, the inner shell assembly 20 can gradually retract into the outer shell assembly 10, that is, the portion of the filter mesh 21 that can be exposed to the outer shell assembly 10 gradually decreases.

[0047] Specifically, the inner shell assembly 20 is fitted inside the outer shell assembly 10 and can extend and retract within the outer shell assembly 10. The inner cavity of the inner shell assembly 20 is connected to the negative pressure chamber 11. The cleaning assembly 30 can move along the peripheral wall of the inner shell assembly 20 to clean the filter mesh 21. When the inner shell assembly 20 is in the first position, the filter mesh 21 of the inner shell assembly 20 is exposed to the outer shell assembly 10 to filter the airflow leading to the air intake 12, so that the filtered air flows out from the air intake 12. As the filter mesh 21 continues to filter the airflow, dust or debris adheres to the filter mesh 21. The air intake 12 draws air, creating a negative pressure inside the outer shell assembly 10. When the filter mesh 21 is completely or nearly completely blocked, the negative pressure of the outer shell assembly 10 continues to rise to its maximum. When the negative pressure value rises to a certain value, the inner shell assembly 20 is attracted and rises, moving from the first position to the second position. During the rising process, the cleaning component 30 moves along the peripheral wall of the inner shell assembly 20 to clean the filter mesh 21, realizing the automatic cleaning of the self-cleaning device 100 when debris is blocked.

[0048] According to the self-cleaning device 100 of this application embodiment, the inner shell assembly 20 is retractable and movable within the outer shell assembly 10. During the movement, the cleaning component 30 cleans the filter mesh 21 of the inner shell assembly 20, thereby achieving the self-cleaning function, improving the convenience of maintenance of the self-cleaning component 30, and effectively improving work efficiency.

[0049] When the inner shell assembly 20 moves from the first position to the second position, the cleaning component 30 moves along the peripheral wall of the inner shell assembly 20 to clean the filter mesh 21. After the peripheral wall of the filter mesh 21 is cleaned, the airflow re-enters through the filter mesh 21, the pressure difference between the inside and outside of the self-cleaning device 100 is balanced, and the inner shell assembly 20 can automatically fall back to the first position. Of course, the self-cleaning device 100 may also include a damping component 53, which can be connected to the inner shell assembly 20 and the outer shell assembly 10 respectively to apply an elastic thrust to the inner shell assembly 20 when it moves to the first position.

[0050] Reference Figure 5 and Figure 10 In some embodiments of this application, the cleaning component 30 includes a scraper ring 31 that extends circumferentially along the outer shell component 10. The outer periphery of the scraper ring 31 is fixedly connected to the outer shell component 10, and the inner periphery of the scraper ring 31 abuts against the outer periphery of the inner shell component 20. When the inner shell component 20 moves between a first position and a second position, the inner periphery of the scraper ring 31 moves along the outer periphery of the inner shell component 20 to clean the filter mesh 21.

[0051] Specifically, by drawing air through the air extraction port 12, a negative pressure can be generated inside the outer shell assembly 10. When the filter mesh 21 is completely or nearly completely blocked, the negative pressure of the outer shell assembly 10 can continue to rise to its maximum. When the negative pressure value rises to a predetermined value, under the negative pressure action of the negative pressure chamber 11 inside the outer shell assembly 10, the inner shell assembly 20 can be attracted and raised, moving the inner shell assembly 20 from the first position to the second position. During this process, the scraping ring 31 connected to the outer shell assembly 10 can abut against the outer peripheral surface of the inner shell assembly 20 and can move relative to the outer peripheral surface of the inner shell assembly 20, thereby scraping off the garbage, dust, etc. attached to the inner shell assembly 20, realizing the cleaning of the inner shell assembly 20 by the cleaning component 30.

[0052] Of course, the scraper ring 31 can be an annular plate extending from the outer periphery to the inner periphery, or it can be an annular plate extending from the outer periphery to the inner periphery and inclined in the axial direction toward the housing assembly, etc. This is not a limitation on the scope of protection of the present invention.

[0053] For example, refer to Figure 5 and Figure 10In some embodiments of this application, the scraping ring 31 is inclined in a predetermined direction from the outer periphery to the inner periphery, and the predetermined direction is the inclination of the inner shell assembly 20 from the second position to the first position. When the inner shell assembly 20 is in the first position, the portion of the inner shell assembly 20 with filter mesh holes 21 extends out of the scraping ring 31. This arrangement causes the inner periphery of the scraping ring 31 to abut against the outer peripheral surface of the inner shell assembly 20, thereby achieving cleaning of the filter mesh holes 21.

[0054] The inner shell assembly 20 has a portion with filter mesh 21 extending outwards via a scraper ring 31. This allows debris or ash to adhere to the filter mesh 21 as airflow passes through it, improving the filtration effect. Furthermore, when the inner shell assembly 20 moves from the first position to the second position, the scraper ring 31 can adhere to and move through the complete filter mesh 21, cleaning away dust or debris and improving the cleanliness of the filter mesh 21.

[0055] Specifically, within the outer shell assembly 10, when the inner shell assembly 20 moves from the first position to the second position, the portion of the inner shell assembly 20 extending outwards from the scraper ring 31 can gradually retract into the outer shell assembly 10. During this process, the inner circumferential surface of the scraper ring 31 can abut against the filter mesh 21, and as the inner shell assembly 20 moves, it scrapes away the dust or debris attached to the surface of the filter mesh 21.

[0056] In addition, the scraper ring 31 can be fixedly connected to the housing assembly 10. The outer periphery of the scraper ring 31 can be connected to the housing assembly by screws, or a pressure ring 34 can be fitted on the scraper ring 31 to tighten the screws, ensuring the installation stability of the scraper ring 31 and preventing the scraper ring 31 from falling off during the movement of the inner housing assembly 20 between the first and second positions.

[0057] Furthermore, referring to Figure 5 and Figure 10 In some embodiments of this application, the cleaning component 30 further includes a cleaning ring 32, which extends circumferentially along the outer shell component 10. The cleaning ring 32 includes a fixing ring 321 and a brush 322 disposed on the fixing ring 321. The fixing ring 321 is fixedly connected to the outer shell component 10, and the brush 322 is disposed on the fixing ring 321 and abuts against the outer peripheral surface of the inner shell component 20. When the inner shell component 20 moves between a first position and a second position, the brush 322 can move along the outer peripheral surface of the inner shell component 20 to clean the filter mesh 21.

[0058] When the inner shell assembly 20 moves from the first position to the second position, the brush 322 set on the fixing ring 321 can clean the firmly attached or fine dust on the filter mesh 21 set on the inner shell assembly 20, so that the filter mesh 21 is thoroughly cleaned and the self-cleaning effect of the self-cleaning device 100 is improved.

[0059] In addition, along the direction from the first position to the second position, the scraping ring 31 and the washing ring 32 can be sequentially connected to the outer shell assembly 10. When the inner shell assembly 20 moves from the first position to the second position, the scraping ring 31 can first clean the light debris and dust attached to the filter mesh 21, and then the brush 322 in the washing ring 32 can clean the more firmly attached or finer dust on the filter mesh 21, so that the filter mesh 21 can be cleaned multiple times, thereby improving the self-cleaning effect of the self-cleaning device 100.

[0060] Reference Figures 11 to 14 In some embodiments of this application, the self-cleaning device 100 may include a damping element 53, which is configured to apply an elastic thrust to the inner shell assembly 20 to push it toward the first position. Understandably, when dust removal causes debris to clog the filter mesh 21, the inner shell assembly 20 is drawn upwards due to the increased negative pressure within the negative pressure chamber 11. During this upward movement, the cleaning component 30 moves along the peripheral wall of the inner shell assembly 20 to clean the filter mesh 21. At this time, the compressible damping element 53 moves upwards. When the filter mesh 21 is cleaned, airflow re-enters the negative pressure chamber 11 from the filter mesh 21, balancing the internal and external pressure difference of the self-cleaning device 100. Then, under the elastic thrust of the damping element 53, the inner shell assembly 20 can quickly fall, allowing the self-cleaning device 100 to quickly return from the second position to the first position, thus improving the operating efficiency of the self-cleaning device 100.

[0061] Of course, the damping element 53 can also be connected to the inner shell assembly 20 and the outer shell assembly 10 respectively, so that the self-cleaning device 100 can quickly return from the second position to the first position, thereby improving the operating efficiency of the cleaning device 100.

[0062] Additionally, refer to Figure 4 In some embodiments of this application, the self-cleaning device 100 further includes a housing 40 and a piston 52. The housing 40 is fixedly connected to the outer shell assembly 10, and the piston 52 is movably fitted inside the housing 40 and fixedly connected to the inner shell assembly 20. Therefore, in conjunction with the aforementioned embodiments, the damping member 53 can be connected to both the housing 40 and the piston 52, and the damping member 53 is configured to apply an elastic thrust to the inner shell assembly 20 when it moves to the first position. This drives the inner shell assembly 20 back to the first position from the second position, improving the operating efficiency of the self-cleaning device 100.

[0063] The housing 40 can be fixedly connected to the outer shell assembly 10. Specifically, a threaded post can be provided at the upper end of the housing 40, and a corresponding through hole is also provided on the outer shell assembly 10. The threaded post can pass through the through hole, and the housing 40 and the outer shell assembly 10 can be fixedly connected by a nut.

[0064] Specifically, when the filter mesh 21 is completely or nearly completely blocked, the negative pressure of the outer shell assembly 10 continues to rise to its maximum. When the negative pressure value rises to a predetermined value, it can overcome the damping of the damping element 53 and the gravity of the inner shell assembly 20. That is, the inner shell assembly 20 is attracted to rise. During the rising process, the inner shell assembly 20 is cleaned by the cleaning element 30, allowing the airflow to pass through the filter mesh 21 again. At this time, the internal and external pressure difference of the self-cleaning device 100 is balanced, and the inner shell assembly 20 can be driven by the damping element 53 to move from the second position to the first position.

[0065] In addition, the piston 52 is movably fitted inside the housing 40, and the piston 52 can be fixedly connected to the inner housing assembly 20, which can provide guidance for the movement of the inner housing assembly 20, so that the inner housing assembly 20 can move stably between the first position and the second position.

[0066] Secondly, the damping element 53 can be a spring, with one end connected to the piston 52 and the other end connected to the housing 40. When the filter mesh 21 is completely or nearly completely blocked, the negative pressure of the outer housing assembly 10 continues to rise to its maximum. When the negative pressure value rises to a predetermined value, the piston 52 can move upward along the inside of the housing 40. That is, the piston 52 is attracted upward. During the upward movement, the inner housing assembly 20 cleans the filter mesh 21 through the cleaning component 30, allowing the airflow to pass through the filter mesh 21 again, thus balancing the internal and external pressure difference of the self-cleaning device 100. At this time, the spring has an elastic thrust that pushes the piston 52, causing the inner housing assembly 20 connected to the piston 52 to move from the second position to the first position, thereby improving the cleaning efficiency of the self-cleaning device 100.

[0067] Reference Figures 1 to 4In some embodiments of this application, the self-cleaning device 100 may further include a housing 40, a piston 52, and a water spray element 54. The housing 40 has a water inlet 51 and is fixedly connected to the outer shell assembly 10. The piston 52 is axially movably disposed within the housing 40, defining a water storage cavity communicating with the water inlet 51 within the housing 40. The piston 52 is fixedly connected to the inner shell assembly 20. The water spray element 54 communicates with the water storage cavity and is adapted to spray water toward the inner shell assembly 20 to clean the inner shell assembly 20. For example, when the inner shell assembly 20 rises, the housing 40 can be driven to move upward, compressing the damping element 53, causing the piston 52 to move upward, forcing water out of the water storage cavity, which is then sprayed out by the water spray element 54. After the cleaning assembly 30 cleans the filter mesh 21, the water spray element 54 further cleans the inner shell assembly 20. By setting up the housing 40, piston 52 and water spray component 54, the self-cleaning device 100 can be further cleaned to improve the self-cleaning ability of the self-cleaning device 100. Moreover, the rising of the housing 40 and the inner housing assembly 20 is powered by the same power source, reducing energy consumption.

[0068] Furthermore, the self-cleaning device 100 may also include a spray frame 55 and a nozzle 56. The spray frame 55 is fixedly connected to the outer periphery of the housing assembly 10, and the spray frame 55 has a water flow channel that communicates with the water storage chamber. The nozzle 56 is connected to the spray frame 55 and communicates with the water flow channel, and the nozzle 56 is opposite to the inner housing assembly 20. Specifically, when the inner housing assembly 20 is in the second position, the nozzle 56 is opposite to the holes of the filter screen 23. By fixing the water spray frame 55 to the outer periphery of the outer casing assembly 10 and setting the nozzle 56 on the water spray frame 55, when the inner casing assembly 20 is attracted to rise to the second position due to negative pressure, it will drive the casing 40 to move upward, compress the damping element 53, and push the piston 52 to move upward, so that the water in the casing 40 is forced out to the water spray frame 55 fixed to the outer periphery of the outer casing assembly 10 and atomized and sprayed out from the nozzle 56, so that the filter screen 21 cleaned by the cleaning component 30 is further rinsed, ensuring the permeability of the filter screen 21 and further improving the self-cleaning ability of the self-cleaning device 100.

[0069] The self-cleaning device 100 may further include a water inlet pipe 57 and a one-way valve 58. The one-way valve 58 is connected between the water inlet pipe 57 and the water inlet 51, and is configured to allow one-way flow from the water inlet pipe 57 to the water inlet 51. By providing the one-way valve 58 between the water inlet pipe 57 and the water inlet 51, water entering from the water inlet pipe 57 can only flow to the water inlet 51 and cannot flow out, so that the water flow can flush the filter screen 21 of the inner shell assembly 20 and prevent water from flowing back out. Understandably, the self-cleaning device 100 can be applied to a sweeper 1000 or a vacuum cleaner. For example, when applied to a sweeper 1000, the sweeper 1000 can be equipped with a garbage collection bin 200. The water inlet pipe 57 absorbs the wastewater in the collection bin 200. A filter 59 can be installed on the water inlet pipe 57 to filter the wastewater sucked in. By setting a one-way valve 58, the filtered water can be drawn in one direction to the spray pipe and atomized and sprayed out through the nozzle 56. There is no need to set up an additional clean water tank. It shares the same power source as the inner shell assembly 20, so it does not need to rely on an additional power source, reducing energy consumption. Furthermore, water is saved by reusing wastewater. As the shell 40 rises with the inner shell assembly 20, the water inside the shell 40 is forced into the spray frame 55 and atomized through the nozzle 56 to further clean the surface of the filter mesh 21. As the inner shell assembly 20 falls, the wastewater in the dust collection bin 200 is filtered by the filter 59 and then re-inhaled into the shell 40 for storage, ready for the next use. The piston 52 forms a sealed space after being connected to the shell 40. The damping element 53 allows the shell 40 to quickly return to its original position and absorb water after being compressed and drained.

[0070] Reference Figure 3 and Figure 5 In some embodiments of this application, the outer shell assembly 10 may include a first cylindrical body 13 and an end plate 14. The end plate 14 is disposed at one end of the first cylindrical body 13, and the air extraction port 12 is disposed on the end plate 14. The other end of the first cylindrical body 13 is open so that the inner shell assembly 20 is fitted inside the first cylindrical body 13. When the inner shell assembly 20 is in the first position, it extends from the other end of the first cylindrical body 13. The extended part is a filter mesh 21 so that when the inner shell assembly 20 is in the first position, it filters the airflow leading to the air extraction port 12.

[0071] Reference Figure 6 and Figure 7 Furthermore, the inner shell assembly 20 may include a second cylinder 22, a filter screen 23, and a pressure valve 26. The second cylinder 22 is fitted inside the outer shell assembly 10. One end of the first cylinder 13 is close to the air extraction port 12 and is open, allowing airflow to be drawn out from the air extraction port 12. The filter screen 23 is located at the other end of the first cylinder 13, or in other words, the filter screen 23 is located away from the end plate 14. The filter screen 23 can be used for ventilation filtration, and the pore size of the filter screen 23 can be large or small, and can be adjusted according to actual usage requirements. The pressure valve 26 is located inside the filter screen 23 and can switch between the open and closed states of the filter screen 23. Figure 11 Furthermore, the opening pressure of the pressure valve 26 is greater than the damping of the inner shell assembly 20 moving from the first position to the second position. The filter mesh 21 is located on the second cylinder 22 near the end of the filter screen 23. When the inner shell assembly 20 is in the first position, the filter mesh 21 filters the airflow leading to the exhaust port 12. Figure 12 When the filter mesh 21 is blocked, the negative pressure in the negative pressure chamber 11 rises, and the inner shell assembly 20 is attracted to rise.

[0072] like Figure 13 and Figure 14 The opening pressure of pressure valve 26 is greater than the damping resistance of inner shell assembly 20 moving from the first position to the second position. In other words, when inner shell assembly 20 overcomes the damping of damping element 53 and rises to the second position, the negative pressure in negative pressure chamber 11 rises to its maximum, pressure valve 26 opens, and switches from the closed state of filter screen 23 to the open state of filter screen 23. Pressure valve 26 may be equipped with two semi-circular valves, which open upwards, allowing airflow to enter negative pressure chamber 11 through filter screen 23, balancing the pressure difference inside and outside self-cleaning device 100. Under the restoring force of damping element 53, inner shell assembly 20 can quickly fall back to the first position, and airflow re-enters the exhaust port 12 through filter screen holes 21 of inner shell assembly 20, closing pressure valve 26. By setting pressure valve 26 and cooperating with filter screen 23, inner shell assembly 20 can quickly fall back from the second position to the first position after completing self-cleaning, thereby improving the working efficiency of self-cleaning device 100.

[0073] Reference Figure 3 and Figure 6 In some embodiments of this application, the inner shell assembly 20 is fitted inside the outer shell assembly 10 and is telescopically extendable along the axial direction of the outer shell assembly 10 at a first position and a second position. The inner shell assembly 20 may be provided with rollers 24, and the inner circumferential surface of the outer shell assembly 10 may be provided with a sliding groove 15 that rolls with the rollers 24. The sliding groove 15 extends along the axial direction of the outer shell assembly 10, and the rollers 24 roll along the sliding groove 15 when the inner shell assembly 20 moves between the first and second positions. By configuring the rollers 24 and the sliding groove 15 to cooperate, the movement of the inner shell assembly 20 at the first and second positions is smoother, thereby effectively cleaning the filter mesh 21. The roller 24 can be a tensioning roller, which may be supported by an elastic mechanism (such as a spring) to allow the roller 24 to be pushed outward. The roller 24 can be fixed to the inner shell assembly 20 with screws. The roller 24 rolls in the slide groove 15. Due to the support of the elastic mechanism, it has a certain preload, so that the entire inner shell assembly 20 will not vibrate or shake due to the shaking of the self-cleaning device 100 during use, which can increase the stability of the self-cleaning device 100 during operation.

[0074] Reference Figures 6 to 9Furthermore, the inner shell assembly 20 may include a second cylindrical body 22, a mounting bracket 27, and a connecting bracket 28. The second cylindrical body 22 has a notch on its peripheral wall. The mounting bracket 27 is located inside the second cylindrical body 22 and is fixedly connected to it. The mounting bracket 27 is U-shaped with its opening facing the notch. The first end of the connecting bracket 28 is connected to the mounting bracket 27, and the second end extends downwards towards the notch. A roller 24 is rotatably connected to the second end of the connecting bracket 28. A portion of the roller 24 is located inside the second cylindrical body 22, and another portion extends through the notch outwards from the outer peripheral surface of the second cylindrical body 22 to allow for vertical movement within the outer shell assembly 10. The peripheral wall of the second cylindrical body 22 has multiple notches arranged circumferentially around the second cylindrical body 22, with the number of notches corresponding to the number of rollers 24. The rollers 24 can be two, three, four, or other numbers, preferably four, to ensure stable vertical movement of the inner shell assembly 20 within the outer shell assembly 10. By setting a mounting bracket 27 on the peripheral wall of the inner shell assembly 20 and connecting the roller 24 through a connecting bracket 28, and setting a notch on the inner shell assembly 20, the roller 24 is embedded in the inner shell assembly 20. In conjunction with the sliding groove 15 of the outer shell assembly 10, the sliding groove 15 can guide the inner shell assembly 20 to extend and retract vertically, so that the inner shell assembly 20 can move stably between the first position and the second position to complete the self-cleaning of the inner shell assembly 20 and ensure the working stability of the self-cleaning device 100.

[0075] At least one of the top and bottom of the slide 15 may be provided with a roller 24 limiting structure for limiting the inner shell assembly 20. When the inner shell assembly 20 is in the first position and the second position, the limiting structure can limit the inner shell assembly 20 to prevent the inner shell assembly 20 from detaching from the outer shell assembly 10 when it moves within the outer shell assembly 10.

[0076] Reference Figure 5 and Figure 10 In some embodiments of this application, the cleaning component 30 may include a scraper ring 31. The scraper ring 31 extends circumferentially along the outer shell component 10. The outer periphery of the scraper ring 31 is fixedly connected to the outer shell component 10, and the inner periphery of the scraper ring 31 abuts against the outer periphery of the inner shell component 20. When the inner shell component 20 moves between a first position and a second position, the inner periphery of the scraper ring 31 moves along the outer periphery of the inner shell component 20 to clean the filter mesh 21. The scraper ring 31 is fixedly connected to the outer shell component 10, which can be done by screws, or by fitting a pressure ring 34 onto the scraper ring 31 and tightening it with screws to ensure the stability of the scraper ring 31 after installation and to prevent the scraper ring 31 from falling off during the up-and-down movement of the inner shell component 20. The outer periphery of the scraping ring 31 is fixed to the outer shell assembly 10, and the inner periphery is attached to the outer periphery of the inner shell assembly 20, so as to scrape off the dust or debris on the surface of the filter mesh 21 of the inner shell assembly 20 when the inner shell assembly 20 moves between the first position and the first position.

[0077] Furthermore, the cleaning component 30 may also include a sweeping ring 32, which extends circumferentially along the outer casing component 10. The sweeping ring 32 includes a retaining ring 321 and a brush 322 disposed on the retaining ring 321. The retaining ring 321 is fixedly connected to the outer casing component 10. The brush 322 is disposed on the retaining ring 321 and abuts against the outer peripheral surface of the inner casing component 20. When the inner casing component 20 moves between a first position and a second position, the brush 322 moves along the outer peripheral surface of the inner casing component 20 to clean the filter mesh 21. By providing the brush 322 on the sweeping ring 32, the dust in the filter mesh 21 can be further cleaned to ensure the self-cleaning effect. During the upward movement of the inner shell assembly 20, the surface of the filter mesh 21 is first scraped off by the scraping ring 31, and then the brush 322 of the washing ring 32 cleans the firmly attached or fine dust on the filter mesh 21, so that the filter mesh 21 is thoroughly cleaned and the self-cleaning effect of the self-cleaning device 100 is improved.

[0078] Referring to this application, a dust removal system is provided, which may include a dust collection bin 200, a housing 300, a suction nozzle device 400, the aforementioned self-cleaning device 100, and an air extraction device 500. The housing 300 covers the dust collection bin 200 and has an air inlet 301. The suction nozzle device 400 is connected to the housing 300 and communicates with the air inlet 301. The self-cleaning device 100 is disposed within and connected to the housing 300. The air extraction device 500 is connected to the housing 300 and communicates with an air extraction port 12. The air extraction device 500 drives airflow from the suction nozzle device 400 into the housing 300 and the dust collection bin 200, and after being filtered through the filter mesh 21, it is discharged from the air extraction device 500. A sealing gasket may be provided on the housing 300, and the gasket is fixed to the housing 300 with screws to ensure the airtightness of the housing 300. So that when the air extraction device 500 extracts air, negative pressure is generated inside the self-cleaning device 100.

[0079] Reference Figures 15 to 20The housing 300 is constructed by welding together a front side panel, a right side panel, a left side panel, a rear side panel, and a bottom support plate. A top cover plate is installed on top of this frame. Nuts are welded to the mounting holes, and left and right sealing gaskets and front and rear sealing gaskets are used to fill the mating surfaces with the top cover plate. Screws and washers are used for tightening to ensure a tight seal. A sealing gasket is placed on top of the top cover plate to mate with the bottom of the fan, ensuring a tight seal. An air inlet pipe is installed at the front of the housing 300, secured with screws and washers, and is removable for easy cleaning of any blockages. A garbage can sealing gasket can be attached to the bottom of the housing 300 frame using AB glue. A hinge pin support can be welded to the upper part of the front panel of the housing 300, secured using a straight-neck grease fitting, bolts, and the hinge pin. Gas spring supports are welded to the outer sides of both the right and left panels of the housing 300, and anti-loosening nuts are used to install and secure the gas springs. This allows the housing 300 to rotate around the hinge pin under manual force, exerting downward pressure to ensure the housing 300 completely presses down on the dust collection bin 200, guaranteeing airtightness. Elastic hooks are screwed to the outer sides of the right and left panels of the housing 300. These hooks are used to pull downwards after the housing 300 presses down on the dust collection bin 200, hooking onto the bin to prevent the housing 300 assembly from rotating upwards and opening due to impacts when the sweeper 1000 travels on uneven roads. This allows the housing 300 to be manually lifted and rotated around the hinge pin, enabling manual tilting and facilitating maintenance. Compared to traditional fixed dust collection boxes, it is easier to clean the garbage inside the box 300, which facilitates the maintenance of the dust collection bin 200. It solves the problem of the garbage bin falling due to hydraulic cylinder contraction caused by valve leakage in traditional garbage bin lifting solutions, and also solves the problem of garbage bins easily deforming under excessive force.

[0080] Reference Figure 18The dust removal system can be applied to the sweeper 1000 or other dust collection and cleaning equipment. Taking the sweeper 1000 as an example, the sweeper 1000 is suitable for operation on dry roads, roads with standing water, or rainy days. The suction nozzle device 400 can be equipped with a dust suppression spray nozzle 56. When the sweeper 1000 is working, garbage and water enter from the front end of the suction nozzle device 400 with the air. Guided by the suction pipe of the suction nozzle device 400, they enter the housing 300. Water and garbage fall into the bottom of the dust collection bin 200 after impacting the outer wall of the self-cleaning device 100. Some light garbage rises with the airflow and is filtered by the filter screen 23 of the self-cleaning device 100. Clean air is discharged through the exhaust device 500. As the sweeper 1000 continues to work, a large amount of light debris and dust gradually accumulates on the filter mesh 21 of the inner shell assembly 20. When the filter mesh 21 is not completely blocked, the sweeper 1000 can still work normally, but the negative pressure in the suction device 400 decreases, while the negative pressure in the self-cleaning device 100 increases. As the filter mesh 21 is completely or almost completely blocked, the negative pressure in the self-cleaning device 100 will continue to rise to its maximum. When the negative pressure value rises to a certain value, the inner shell assembly 20 will be attracted upward. During the upward movement, the light debris and dust adsorbed on the filter mesh 21 are pushed downward by the scraper ring 31, causing them to detach. Meanwhile, the more firmly attached or finer dust will continue to fall off as the inner shell assembly 20 rises, due to the cleaning action of the bristles on the sweeping ring 32. Simultaneously, the rise of the inner shell assembly 20 will cause the water pump base in the shell 40 to move upward, compressing the damping element 53 and pushing the piston 52 upward, forcing water out of the pump. This water is then atomized and sprayed out from the nozzle 56 through the spray frame 55, further rinsing the dirt cleaned by the scraper ring 31 in the inner shell assembly 20 and ensuring the permeability of the filter screen 23. When the inner shell assembly 20 rises to its highest point, as the negative pressure in the cavity increases to its maximum, the pressure valve 26 opens, and the airflow can enter the cavity through the filter mesh 21 and the filter screen 23. A small amount of light, airborne debris is blocked by the filter screen 23. Due to the pressure difference balance between the box 300 and the self-cleaning device 100, and the restoring force of the damping element 53, the inner shell assembly 20 will quickly fall until the first airflow re-enters the suction device 500 through the filter mesh 21 of the inner shell assembly 20, and the pressure valve 26 closes. The housing 40, which falls together with the inner housing assembly 20, drives the piston 52 to fall, creating negative pressure inside the housing 40 and generating a water suction effect. The wastewater in the dust collection bin 200 is filtered into clean water by the filter 59, and then flows through the water inlet pipe 57 and the one-way valve 58 into the housing 40 for future use.Multiple actions rely on the internal negative pressure generated by the self-cleaning device 100's blockage, coupled with a mechanical structure, requiring no additional power source. This automated, real-time linkage reduces maintenance steps during the operation of the sweeper 1000, lowering maintenance difficulty and requirements. Furthermore, its compact structure makes efficient use of the internal space of the housing 300, facilitating structural optimization, reducing production costs, improving operational efficiency, and minimizing manual labor requirements. The self-cleaning device 100 automatically cleans itself, extending the lifespan of the filter components and reducing the frequency of subsequent manual replacement and maintenance.

[0081] Reference Figures 19 to 20 When the dust collection bin 200 needs to be replaced, first remove the elastic hook on the housing 300, then manually lift the housing 300 and the suction device 500 upwards. The housing 300 rotates around the hinge support, and under the action of the gas spring, the housing 300 can maintain a certain opening angle, at which point the dust collection bin 200 can be replaced. At the same time, because the housing 300 is lifted upwards and facing backwards, there is more operating space, making it easier to clean the self-cleaning device 100.

[0082] The sweeper 1000 of this application embodiment, by cooperating with a water-absorbing dust suppression structure, realizes a wet-bin dust collection system arrangement, solving the pain point of existing dry-bin dust collection systems being unable to operate in rainy weather, and the problem of clogging and difficulty in cleaning existing dry-bin dust collection systems. Compared with existing wet-bin dust collection systems, it reduces costs, facilitates the replacement of garbage bins, improves work efficiency, and offers high flexibility. Furthermore, 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 indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0083] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0084] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A self-cleaning device, characterized in that, include: The housing assembly (10) has a negative pressure chamber (11) and an air extraction port (12) communicating with the negative pressure chamber (11); An inner shell assembly (20) is fitted inside the outer shell assembly (10) and is extendable and retractable between a first position and a second position along the axial direction of the outer shell assembly (10). The inner cavity of the inner shell assembly (20) is connected to the negative pressure chamber (11). A filter mesh (21) communicating with the inner cavity of the inner shell assembly (20) is provided on the peripheral wall of the inner shell assembly (20). When the inner shell assembly (20) is in the first position, the filter mesh (21) is exposed in the outer shell assembly (10) to filter the airflow leading to the air extraction port (12). When the inner shell assembly (20) is in the second position, it retracts into the outer shell assembly (10) relative to the first position. A cleaning component (30) is connected to the outer shell assembly (10) and is configured such that when the inner shell assembly (20) moves between the first position and the second position, the cleaning component (30) moves along the peripheral wall of the inner shell assembly (20) to clean the filter mesh (21). The outer shell assembly (10) includes a first cylindrical body (13) and an end plate (14), the end plate (14) being disposed at one end of the first cylindrical body (13), and the air extraction port (12) being disposed on the end plate (14); the inner shell assembly (20) includes a second cylindrical body (22), a filter screen (23), and a pressure valve (26), the second cylindrical body (22) being sleeved inside the outer shell assembly (10), and one end of the first cylindrical body (13) being close to the air extraction port (12). 2) and open; the filter screen (23) is located at the other end of the first cylinder (13); the pressure valve (26) is located inside the filter screen (23) and can be switched between the open and closed states of the filter screen (23), and the opening pressure of the pressure valve (26) is greater than the damping of the inner shell assembly (20) moving from the first position to the second position, and the filter screen hole (21) is located on the second cylinder (22) at one end adjacent to the filter screen (23).

2. The self-cleaning device according to claim 1, characterized in that, The cleaning component (30) includes: A scraping ring (31) extends circumferentially along the outer shell assembly (10). The outer periphery of the scraping ring (31) is fixedly connected to the outer shell assembly (10), and the inner periphery of the scraping ring (31) abuts against the outer periphery of the inner shell assembly (20). When the inner shell assembly (20) moves between the first position and the second position, the inner periphery of the scraping ring (31) moves along the outer periphery of the inner shell assembly (20) to clean the filter mesh (21).

3. The self-cleaning device according to claim 2, characterized in that, The scraper ring (31) is inclined in a predetermined direction from the outer periphery to the inner periphery, and the predetermined direction is the direction in which the inner shell assembly (20) is inclined from the second position to the first position; When the inner shell assembly (20) is in the first position, the portion of the inner shell assembly (20) with filter mesh (21) extends out of the scraper ring (31).

4. The self-cleaning device according to any one of claims 1-3, characterized in that, The cleaning component (30) also includes: A cleaning ring (32) extends circumferentially along the outer shell assembly (10), and the cleaning ring (32) includes a fixing ring (321) and a brush (322) disposed on the fixing ring (321). The fixing ring (321) is fixedly connected to the outer shell assembly (10), and the brush (322) is disposed on the fixing ring (321) and abuts against the outer peripheral surface of the inner shell assembly (20). When the inner shell assembly (20) moves between the first position and the second position, the brush (322) moves along the outer peripheral surface of the inner shell assembly (20) to clean the filter mesh (21).

5. The self-cleaning device according to any one of claims 1-3, characterized in that, The self-cleaning device further includes a damping element (53) configured to apply an elastic thrust to the inner shell assembly (20) to move the inner shell assembly (20) toward the first position; And / or, the self-cleaning device further includes a housing (40) and a piston (52), the housing (40) being fixedly connected to the outer shell assembly (10), the piston (52) being movably fitted inside the housing (40), and the piston (52) being fixedly connected to the inner shell assembly (20).

6. The self-cleaning device according to claim 1, characterized in that, The other end of the first cylindrical body (13) is open, the inner shell assembly (20) is fitted inside the first cylindrical body (13), and the inner shell assembly (20) extends from the other end of the first cylindrical body (13) at the first position.

7. The self-cleaning device according to claim 1, characterized in that, The inner shell assembly (20) is provided with a roller (24), and the inner circumferential surface of the outer shell assembly (10) is provided with a sliding groove (15) that rolls with the roller (24). The sliding groove (15) extends along the axial direction of the outer shell assembly (10). When the inner shell assembly (20) moves between the first position and the second position, the roller (24) rolls along the sliding groove (15).

8. The self-cleaning device according to claim 7, characterized in that, The inner shell assembly (20) includes a second cylinder (22), a mounting bracket (27), and a connecting bracket (28). The second cylinder (22) has a notch on its peripheral wall. The mounting bracket (27) is located inside the second cylinder (22) and is fixedly connected to the second cylinder (22). The mounting bracket (27) is U-shaped with its opening facing the notch. The first end of the connecting bracket (28) is connected to the mounting bracket (27), and the second end extends downward towards the notch. The roller (24) is rotatably connected to the second end of the connecting bracket (28). A portion of the roller (24) is located inside the second cylinder (22), and another portion extends through the notch and out of the outer peripheral surface of the second cylinder (22). The peripheral wall of the second cylinder (22) has a plurality of notches, and the plurality of notches are arranged along the circumference of the second cylinder (22). And / or, at least one of the top and bottom of the groove (15) is provided with a roller (24) limiting structure for limiting the inner shell assembly (20).

9. A dust removal system, characterized in that, include: Dust collection bin (200); A housing (300) is provided, which covers the dust collection bin (200) and has an air inlet (301). A suction nozzle device (400) is connected to the housing (300) and communicates with the air inlet (301); The self-cleaning device according to any one of claims 1-8 is disposed in the housing (300) and connected to the housing (300); An air extraction device (500) is connected to the housing (300) and communicates with the air extraction port (12). The air extraction device (500) drives the airflow from the suction nozzle device (400) into the housing (300) and the dust collection bin (200), and after being filtered by the filter mesh (21), it is sent out from the air extraction device (500).

10. A road sweeper, characterized in that, Includes the dust removal system according to claim 9.

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