A robot vacuum cleaner and a control method thereof

Abstract

This invention provides a second air inlet on the filter box, offering airflow paths for both dust collection and dust removal modes. During dust removal, the suction generated by the workstation guides external air in through the second inlet, then reverses direction through the filter element before entering the dust collection chamber. This reverse airflow effectively washes away and removes fine dust adhering to the filter element's side facing the dust collection chamber, allowing this dust to be discharged with the airflow from the first air outlet back to the workstation. This invention not only removes accumulated dust inside the dust collection chamber but also cleans dust adsorbed on the filter element, significantly extending the effective service life of the filter element and maintaining its cleanliness.

Description

Technical Field

[0001] This invention belongs to the field of cleaning equipment technology, specifically relating to a sweeper and its control method. Background Technology

[0002] During the cleaning process, the sweeper uses a suction fan to suck dust, debris, and other garbage from the ground into the dust collection chamber. To prevent dust from directly entering the suction fan and causing damage or reduced efficiency, a filter (such as a screen or sponge) is usually installed inside the dust collection chamber. The airflow passes through the filter before being discharged, while the dust is trapped inside the dust collection chamber.

[0003] As the number of cleaning sessions increases, dust gradually accumulates in the dust collection chamber, and a large amount of fine dust also adheres to the surface of the filter, leading to filter blockage, increased suction resistance, and reduced cleaning efficiency. To solve these problems, existing robotic vacuum cleaners are often equipped with a detachable workstation, allowing the vacuum cleaner to return to the workstation for dust removal. The workstation has a built-in high-powered suction fan that connects to the vacuum cleaner's exhaust port to suck up the dust from the dust collection chamber and collect it in the workstation's dust bag.

[0004] However, when the workstation performs dust removal, the airflow path only passes through the inside of the dust collection chamber, carrying away the accumulated dust. Dust typically accumulates on the side of the filter facing the dust collection chamber, and the airflow generated by the workstation's suction cannot effectively clean the filter. Over time, the dust on the filter becomes increasingly thick, and even after the dust collection chamber has been emptied, the filter remains clogged, resulting in insufficient suction during subsequent cleaning and a continuous decline in cleaning performance. In existing technologies, some solutions involve manually disassembling and cleaning the filter, but this is cumbersome and provides a poor user experience; other solutions incorporate vibration or scraping mechanisms on the sweeper, but this increases structural complexity and cost. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a sweeping machine that aims to solve the problem in the prior art where the exhaust airflow cannot effectively flush the filter, resulting in the filter becoming clogged and difficult to clean automatically.

[0006] This invention provides a sweeping machine, comprising:

[0007] A dust collection box, wherein a dust collection chamber is provided inside the dust collection box body, and the dust collection chamber has a first air inlet and a first air outlet;

[0008] A dust filter box is located above the dust collection chamber. The dust filter box has a second air inlet. A filter element is provided inside the dust filter box. One side of the filter element faces the dust collection chamber, and the other side faces the second air inlet and maintains a ventilation gap with the second air inlet.

[0009] A suction fan, wherein the ventilation gap is connected to the air inlet of the suction fan, and a second air outlet is provided on the dust collection box, the second air outlet being connected to the air outlet of the suction fan;

[0010] When the dust collection box performs dust collection, the second air inlet is closed, and under the suction of the fan, the first air outlet is closed. The first air inlet and the second air outlet are opened, and the airflow carries dust from the first air inlet into the dust collection chamber. The airflow passes through the filter and enters the ventilation gap, and then flows out from the first air outlet.

[0011] When the dust collection box performs dust removal, the first air outlet is connected to the workstation, the second air inlet is opened, and under the suction of the workstation, the first air inlet and the second air outlet are closed. The airflow enters the ventilation gap from the second air inlet, passes through the filter and enters the dust collection chamber, and then flows out from the first air outlet, bringing the dust into the workstation.

[0012] According to some embodiments of the present invention, the inner side of the dust collection box is provided with a movable sliding perforated plate, and the sliding perforated plate is provided with a through hole. When the dust collection box performs dust collection work, the through hole and the second air inlet are offset from each other, and the sliding perforated plate closes the second air inlet to block the airflow. When the dust collection box performs dust discharge work, the through hole and the second air inlet are at least partially aligned and connected to each other so that the airflow can enter through the second air inlet.

[0013] According to some embodiments of the present invention, the inner side of the dust filter box is provided with a guide groove, and the edge of the sliding perforated plate is movably engaged in the guide groove.

[0014] According to some embodiments of the present invention, the sliding perforated plate is provided with a guide protrusion, the dust filter box is provided with a strip-shaped hole, the guide protrusion extends through the strip-shaped hole to the outside of the dust filter box, when the sweeper enters the workstation, the workstation pushes the guide protrusion to slide in the strip-shaped hole, so that the guide protrusion drives the sliding perforated plate to slide, thereby making the through hole at least partially aligned and connected with the second air inlet.

[0015] According to some embodiments of the present invention, a first stop protrusion is provided on the inner side of the dust filter box, and a second stop protrusion is provided on the sliding perforated plate. A spring is provided between the first stop protrusion and the second stop protrusion. When the sweeper enters the workstation, the guide protrusion drives the sliding perforated plate to slide, and the first stop protrusion compresses the spring. When the sweeper leaves the workstation, the spring drives the sliding perforated plate to return to its initial position, thereby causing the through hole and the air inlet to be misaligned, and the sliding perforated plate to close the second air inlet.

[0016] According to some embodiments of the present invention, both the first stop protrusion and the second stop protrusion are provided with positioning posts, and the two ends of the spring are respectively sleeved on the positioning posts of the first stop protrusion and the second stop protrusion.

[0017] According to some embodiments of the present invention, the first air inlet is rotatably connected to a first rotating plate, and the first rotating plate opens or closes the first air inlet by rotating.

[0018] According to some embodiments of the present invention, the second air outlet is rotatably connected to a second rotating plate, which opens or closes the second air outlet by rotating.

[0019] According to some embodiments of the present invention, the first air outlet is rotatably connected to a third rotating plate, which opens or closes the first air outlet by rotating.

[0020] The present invention also provides a control method for a sweeper based on any one of the above-described methods.

[0021] Includes the following steps:

[0022] When the dust collection box performs dust collection, the second air inlet is closed, the suction fan is started, the first air outlet is closed, and the first air inlet and the second air outlet are opened, so that the airflow carries the dust from the first air inlet into the dust collection chamber. After passing through the filter, the airflow enters the ventilation gap and then flows out from the first air outlet.

[0023] When the dust collection box performs dust removal, the first air outlet is connected to the external workstation, the second air inlet is opened, and the first air inlet and the second air outlet are closed at the same time. The suction of the workstation is activated, so that the airflow enters the ventilation gap from the second air inlet, passes through the filter and enters the dust collection chamber, and finally flows out from the first air outlet, bringing the dust into the workstation.

[0024] Beneficial Effects: This invention provides a second air inlet on the filter box, offering airflow paths for both dust collection and dust removal modes. During dust removal, the suction generated by the workstation guides external air in through the second air inlet, then reverses direction through the filter element and into the dust collection chamber. The reverse airflow generated by the workstation effectively washes away and removes fine dust adhering to the filter element facing the dust collection chamber, allowing this dust to be discharged from the first air outlet back to the workstation along with the airflow. This invention not only removes accumulated dust inside the dust collection chamber but also cleans dust adsorbed on the filter element, significantly extending the effective service life of the filter element and maintaining its cleanliness. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the sweeper of the present invention in the dust collection working mode;

[0027] Figure 2 for Figure 1 Cross-sectional view along the AA direction;

[0028] Figure 3 This is a schematic diagram of the sweeper of the present invention in the dust removal working mode;

[0029] Figure 4 for Figure 1 Cross-sectional view along the BB direction;

[0030] Figure 5 This is a schematic diagram of the internal structure of the sweeper of the present invention in the dust collection working mode;

[0031] Figure 6 This is a schematic diagram of the internal structure of the sweeper of the present invention in the dust removal working mode;

[0032] Figure 7 This is a schematic diagram of the filter box and sliding perforated plate of the present invention in the dust removal working mode;

[0033] Figure 8 This is a schematic diagram of the filter box and sliding perforated plate of the present invention from another perspective in the dust removal working mode.

[0034] In the diagram: 100, dust collection box; 101, dust collection chamber; 102, first air inlet; 103, first air outlet; 104, second air outlet; 200, dust filter box; 201, second air inlet; 202, filter element; 203, ventilation gap; 204, guide groove; 205, strip-shaped hole; 206, first stop protrusion; 300, suction fan; 400, sliding perforated plate; 401, through hole; 402, guide protrusion; 403, second stop protrusion; 404, positioning post; 500, spring; 600, first rotating plate; 700, second rotating plate; 800, third rotating plate. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] Please see Figures 1 to 8 The present invention provides a sweeping machine, comprising:

[0037] Dust collection box 100, the dust collection box 100 body is provided with a dust collection chamber 101, the dust collection chamber 101 is provided with a first air inlet 102 and a first air outlet 103;

[0038] A dust filter box 200 is disposed above the dust collection chamber 101. The dust filter box 200 is provided with a second air inlet 201. A filter element 202 is provided inside the dust filter box 200. One side of the filter element 202 faces the dust collection chamber 101, and the other side faces the second air inlet 201, with a ventilation gap 203 maintained between the filter element 202 and the second air inlet 201.

[0039] The suction fan 300 has a ventilation gap 203 connected to the air inlet of the suction fan 300, and a second air outlet 104 is provided on the dust collection box 100, which is connected to the air outlet of the suction fan 300.

[0040] When the dust collection box 100 performs dust collection, the second air inlet 201 is closed. Under the suction of the fan 300, the first air outlet 103 is closed, and the first air inlet 102 and the second air outlet 104 are opened. The airflow carries dust from the first air inlet 102 into the dust collection chamber 101. After passing through the filter element 202, the airflow enters the ventilation gap 203 and then flows out from the first air outlet 103.

[0041] When the dust collection box 100 performs dust removal, the first air outlet 103 is connected to the workstation, the second air inlet 201 is opened, and under the suction of the workstation, the first air inlet 102 and the second air outlet 104 are closed. The airflow enters the ventilation gap 203 from the second air inlet 201, passes through the filter 202 and enters the dust collection chamber 101, and then flows out from the first air outlet 103, bringing the dust into the workstation.

[0042] This sweeper has two working modes, such as Figure 1 , Figure 2 and Figure 5As shown, in dust collection mode, when the sweeper is cleaning normally, the second air inlet 201 is closed. When the suction fan 300 is started, the first air outlet 103 closes under suction, while the first air inlet 102 and the second air outlet 104 open. At this time, the airflow carries dust from the ground into the dust collection chamber 101 through the first air inlet 102, and larger dust particles settle at the bottom of the dust collection chamber 101. The airflow continues to flow upward, passing through the filter element 202, where dust is intercepted on the lower surface of the filter element 202. The airflow continues into the ventilation gap 203, and then through the air inlet and outlet of the suction fan 300, finally being discharged to the outside through the second air outlet 104.

[0043] like Figure 3 , Figure 4 and Figure 6 As shown, in the dust removal mode, when the sweeper returns to the workstation and needs to remove dust, the first air outlet 103 is connected to the workstation's suction port. At this time, the second air inlet 201 is opened. The high-powered suction fan inside the workstation is activated, and under the suction force of the workstation, the first air inlet 102 and the second air outlet 104 are closed. External air enters the ventilation gap 203 through the second air inlet 201, and then passes through the filter element 202 from top to bottom, which is opposite to the airflow direction during dust collection. The aforementioned reverse airflow can effectively flush away the dust attached to the lower surface of the filter element 202, causing it to detach from the filter element 202 and fall into the dust collection chamber 101. Subsequently, the airflow carrying this dust and the original accumulated dust in the dust collection chamber 101 flows out from the first air outlet 103 and enters the workstation for collection. In this application, the workstation achieves self-cleaning of the filter element 202, avoiding clogging.

[0044] In this application, the filter element 202 is not limited to being placed horizontally. For example, it can be placed with a ventilation gap 203 above and a dust collection chamber 101 below, or it can be placed vertically or at an angle. In this case, the second air inlet 201 can be set on the relatively clean side of the filter element 202, and the dust collection chamber 101 can be located on the relatively dirty side of the filter element 202, as long as the airflow direction during dust discharge is opposite to that during dust collection.

[0045] To achieve automatic switching of the second air inlet 201 from closing during dust collection to opening during dust discharge, according to some embodiments of the present invention, a movable sliding perforated plate 400 is provided on the inner side of the dust collection box 200. The sliding perforated plate 400 has through holes 401. When the dust collection box 100 performs dust collection, the through holes 401 and the second air inlet 201 are offset from each other, and the sliding perforated plate 400 closes the second air inlet 201 to block the airflow. When the dust collection box 100 performs dust discharge, the through holes 401 and the second air inlet 201 are at least partially aligned and connected, allowing airflow to enter through the second air inlet 201. Specifically, the sliding perforated plate 400 is not limited to a flat plate and can also be an arc-shaped plate. The shapes of the through holes 401 and the second air inlet 201 can be round holes, square holes, elongated holes 205, or honeycomb holes. To obtain a smoother airflow, multiple through holes 401 can be arranged in an array. The sliding perforated plate 400 also adopts a rotatable disk with a through hole 401 on it. The second air inlet 201 can be opened and closed by rotating the angle.

[0046] According to some embodiments of the present invention, the inner side of the dust filter box 200 is provided with a guide groove 204, and the edge of the sliding perforated plate 400 is movably engaged within the guide groove 204. In this embodiment, the guide groove 204 provides a linear guide for the sliding perforated plate 400, restricting its degrees of freedom and ensuring that the through hole 401 and the second air inlet 201 can be accurately aligned or offset. The movable engagement of the edge of the sliding perforated plate 400 within the guide groove 204 allows the sliding perforated plate 400 to slide back and forth only along the direction defined by the guide groove 204 (e.g., the horizontal direction), avoiding shaking and jamming. Specifically, guide grooves 204 can be provided in the upper, lower, left, and right directions of the dust filter box 200 to form a four-sided constraint, further improving sliding stability.

[0047] According to some embodiments of the present invention, the sliding perforated plate 400 is provided with a guide protrusion 402, and the dust filter box 200 has a strip-shaped hole 205. The guide protrusion 402 extends through the strip-shaped hole 205 to the outside of the dust filter box 200. When the sweeper enters the workstation, the workstation pushes the guide protrusion 402 to slide within the strip-shaped hole 205, causing the guide protrusion 402 to drive the sliding perforated plate 400 to slide, thereby making the through hole 401 at least partially aligned and connected with the second air inlet 201. Specifically, when the sweeper enters the workstation, a corresponding push block is preset on the workstation. The push block will contact the guide protrusion 402. Since the push block is stationary while the sweeper is moving, the push block pushes the guide protrusion 402 to slide along the strip-shaped hole 205. The movement of the guide protrusion 402 causes the entire sliding perforated plate 400 to slide, thereby aligning the through hole 401 with the second air inlet 201. This implementation method uses a purely mechanical triggering method, which requires no additional sensors or motors, resulting in low cost and high reliability.

[0048] According to some embodiments of the present invention, a first stop protrusion 206 protrudes from the inner side of the dust filter box 200, and a second stop protrusion 403 protrudes from the sliding perforated plate 400. A spring 500 is provided between the first stop protrusion 206 and the second stop protrusion 403. When the sweeper enters the workstation, the guide protrusion 402 drives the sliding perforated plate 400 to slide, and the first stop protrusion 206 compresses the spring 500. When the sweeper leaves the workstation, the spring 500 drives the sliding perforated plate 400 to return to its initial position, thereby causing the through hole 401 to be misaligned with the air inlet, and the sliding perforated plate 400 to close the second air inlet 201. When the sweeper enters the workstation, the guide protrusion 402 is pushed, the sliding perforated plate 400 moves, and at the same time, the second stop protrusion 403 approaches the first stop protrusion 206, compressing the spring 500. At this point, the through hole 401 aligns with the second air inlet 201, enabling dust removal. When the sweeper leaves the workstation, the external thrust disappears, the compressed spring 500 releases its energy, driving the sliding orifice plate 400 to move in the opposite direction and return to its initial position, causing the through hole 401 to re-misalign with the second air inlet 201, thus sealing the second air inlet 201. In this example, the automatic reset of the sliding orifice plate 400 is achieved by the spring 500, requiring no manual intervention or the installation of other power components.

[0049] According to some embodiments of the present invention, both the first stop protrusion 206 and the second stop protrusion 403 are provided with positioning posts 404, and the two ends of the spring 500 are respectively sleeved on the positioning posts 404 of the first stop protrusion 206 and the second stop protrusion 403. In this embodiment, the positioning posts 404 play a role in radially limiting and axially guiding the spring 500, ensuring that the spring 500 will not come out during operation and guaranteeing the stability of the compression and reset actions.

[0050] In the above embodiments, the opening and closing of the second air inlet 201 can be automatically triggered by the mechanical movements of the sweeper entering and leaving the workstation. This purely mechanical triggering method eliminates the need for additional electronic control components such as sensors, motors, or solenoid valves, reducing manufacturing costs and circuit complexity, while also offering high operational reliability and service life.

[0051] According to some embodiments of the present invention, a first rotating plate 600 is rotatably connected to the first air inlet 102, and the first rotating plate 600 opens or closes the first air inlet 102 by rotation. Further, the first rotating plate 600 is located below the second air inlet 201. In dust collection mode, the suction force of the fan 300 causes the first rotating plate 600 to open inward, opening the first air inlet 102. In dust exhaust mode, the suction force of the workstation creates a negative pressure within the dust collection chamber 101, and the first rotating plate 600 automatically closes under its own weight and the airflow pressure from the second air inlet 201 above, sealing the first air inlet 102 and preventing dust exhaust airflow from leaking from the first air inlet 102.

[0052] According to some embodiments of the present invention, a second rotating plate 700 is rotatably connected to the second air outlet 104. The second rotating plate 700 opens or closes the second air outlet 104 by rotating. In dust collection mode, the airflow discharged by the suction fan 300 blows the second rotating plate 700 open, causing the second air outlet 104 to open and discharge clean air. In dust removal mode, the second rotating plate 700 closes under the action of gravity and external air pressure, preventing the dust removal airflow from being drawn into the second air outlet 104 and ensuring unobstructed dust removal airflow.

[0053] According to some embodiments of the present invention, a third rotating plate 800 is rotatably connected to the first air outlet 103, and the third rotating plate 800 opens or closes the first air outlet 103 by rotation. In dust collection mode, the suction force of the suction fan 300 creates a negative pressure inside the dust collection chamber 101, and the third rotating plate 800 is sucked closed to prevent external air from entering from the first air outlet 103. In dust removal mode, when the sweeper docks with the workstation, the suction force of the workstation causes the third rotating plate 800 to open outward, opening the first air outlet 103, thereby discharging dust into the workstation.

[0054] The present invention also provides a control method for a sweeper based on any one of the above-described methods.

[0055] Includes the following steps:

[0056] When the dust collection box 100 performs dust collection, the second air inlet 201 is closed, the suction fan 300 is started, the first air outlet 103 is closed, and the first air inlet 102 and the second air outlet 104 are opened, so that the airflow carries the dust from the first air inlet 102 into the dust collection chamber 101. After passing through the filter element 202, the airflow enters the ventilation gap 203 and then flows out from the first air outlet 103.

[0057] When the dust collection box 100 performs dust removal, the first air outlet 103 is connected to the external workstation, the second air inlet 201 is opened, and the first air inlet 102 and the second air outlet 104 are closed at the same time. The suction of the workstation is activated, so that the airflow enters the ventilation gap 203 from the second air inlet 201, passes through the filter 202 and enters the dust collection chamber 101, and finally flows out from the first air outlet 103, bringing the dust into the workstation.

[0058] Through the above control method, the sweeper can achieve reverse self-cleaning of the filter element 202 by utilizing the suction power of the workstation during dust discharge without adding a complex structure. This effectively solves the problem of filter element 202 clogging and enables the sweeper to maintain high cleaning efficiency.

[0059] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0060] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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. Such 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 this application.

Claims

1. A sweeping machine, characterized in that, include: A dust collection box (100) is provided with a dust collection chamber (101) inside the dust collection box (100), and the dust collection chamber (101) has a first air inlet (102) and a first air outlet (103); A dust filter box (200) is provided above the dust collection chamber (101). The dust filter box (200) is provided with a second air inlet (201). A filter element (202) is provided inside the dust filter box (200). One side of the filter element (202) faces the dust collection chamber (101), and the other side faces the second air inlet (201) and maintains a ventilation gap (203) with the second air inlet (201). A suction fan (300) is provided, wherein the ventilation gap (203) is connected to the air inlet of the suction fan (300), and a second air outlet (104) is provided on the dust collection box (100), and the second air outlet (104) is connected to the air outlet of the suction fan (300). When the dust collection box (100) performs dust collection, the second air inlet (201) is closed. Under the suction of the fan (300), the first air outlet (103) is closed, and the first air inlet (102) and the second air outlet (104) are opened. The airflow carries dust from the first air inlet (102) into the dust collection chamber (101). The airflow passes through the filter (202) and enters the ventilation gap (203), and then flows out from the first air outlet (103). When the dust collection box (100) performs dust removal, the first air outlet (103) is connected to the workstation, the second air inlet (201) is opened, and under the suction of the workstation, the first air inlet (102) and the second air outlet (104) are closed. The airflow enters the ventilation gap (203) from the second air inlet (201), passes through the filter (202) and enters the dust collection chamber (101), and then flows out from the first air outlet (103) and carries the dust into the workstation.

2. The sweeper according to claim 1, characterized in that, The dust collection box (200) has a movable sliding perforated plate (400) on its inner side. The sliding perforated plate (400) has a through hole (401). When the dust collection box (100) performs dust collection, the through hole (401) is offset from the second air inlet (201), and the sliding perforated plate (400) closes the second air inlet (201) to block the airflow. When the dust collection box (100) performs dust discharge, the through hole (401) is at least partially aligned and connected with the second air inlet (201) so that the airflow can enter through the second air inlet (201).

3. The sweeper according to claim 2, characterized in that, The dust filter box (200) has a guide groove (204) on its inner side, and the edge of the sliding perforated plate (400) is movably engaged in the guide groove (204).

4. The sweeper according to claim 3, characterized in that, The sliding perforated plate (400) is provided with a guide protrusion (402), and the dust filter box (200) is provided with a strip hole (205). The guide protrusion (402) extends through the strip hole (205) to the outside of the dust filter box (200). When the sweeper enters the workstation, the workstation pushes the guide protrusion (402) to slide in the strip hole (205), so that the guide protrusion (402) drives the sliding perforated plate (400) to slide, thereby making the through hole (401) at least partially aligned and connected with the second air inlet (201).

5. The sweeper according to claim 4, characterized in that, The dust filter box (200) has a first stop protrusion (206) protruding on its inner side, and the sliding perforated plate (400) has a second stop protrusion (403) protruding on its inner side. A spring (500) is provided between the first stop protrusion (206) and the second stop protrusion (403). When the sweeper enters the workstation, the guide protrusion (402) drives the sliding perforated plate (400) to slide, and the first stop protrusion (206) compresses the spring (500). When the sweeper leaves the workstation, the spring (500) drives the sliding perforated plate (400) to return to its initial position, thereby causing the through hole (401) and the air inlet to be misaligned, and the sliding perforated plate (400) to close the second air inlet (201).

6. The sweeper according to claim 5, characterized in that, Both the first stop protrusion (206) and the second stop protrusion (403) are provided with positioning posts (404), and the two ends of the spring (500) are respectively sleeved on the positioning posts (404) of the first stop protrusion (206) and the positioning posts (404) of the second stop protrusion (403).

7. The sweeper according to claim 1, characterized in that, The first air inlet (102) is rotatably connected to a first rotating plate (600), which opens or closes the first air inlet (102) by rotating.

8. The sweeper according to claim 3, characterized in that, The second air outlet (104) is rotatably connected to a second rotating plate (700), which opens or closes the second air outlet (104) by rotating.

9. The sweeper according to claim 1, characterized in that, The first air outlet (103) is rotatably connected to a third rotating plate (800), which opens or closes the first air outlet (103) by rotating.

10. A control method for a sweeping machine according to any one of claims 1-9, characterized in that, Includes the following steps: When the dust collection box (100) performs dust collection, the second air inlet (201) is closed, the suction fan (300) is started, the first air outlet (103) is closed at the same time, and the first air inlet (102) and the second air outlet (104) are opened, so that the airflow carries the dust from the first air inlet (102) into the dust collection chamber (101), the airflow enters the ventilation gap (203) after passing through the filter (202), and then flows out from the first air outlet (103); When the dust collection box (100) performs dust removal, the first air outlet (103) is connected to the external workstation, the second air inlet (201) is opened, and the first air inlet (102) and the second air outlet (104) are closed at the same time. The suction of the workstation is activated, so that the airflow enters the ventilation gap (203) from the second air inlet (201), passes through the filter (202) and enters the dust collection chamber (101), and finally flows out from the first air outlet (103), bringing the dust into the workstation.

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