A self-cleaning method for a surface cleaning device

Abstract

The application discloses a self-cleaning method of a surface cleaning device, the surface cleaning device comprising a ground brush with a roller brush cavity and a cleaning seat, the cleaning seat being provided with a cleaning groove corresponding to a cleaning roller in the roller brush cavity, the roller brush cavity being provided with a liquid injection port and a scraping strip for extruding and scraping the cleaning roller, the cleaning roller and the scraping strip dividing the roller brush cavity into a liquid flow buffer cavity above the scraping strip and a dirt buffer cavity below the scraping strip, the dirt buffer cavity being communicated with the liquid flow buffer cavity through a flow-limiting channel, and the cleaning roller being reversely rotated in a cleaning stage: the cleaning roller is reversely rotated, the scraping strip extrudes and scrapes the bristles, the liquid flow moves in the rotating direction of the cleaning roller, part of the liquid flow dynamically seals the flow-limiting channel, so that the liquid flow accumulates and moves to impact in the liquid flow buffer cavity, and the cleaning roller and the inner wall of the roller brush cavity are flushed.

Description

Technical Field

[0001] This application belongs to the field of cleaning equipment technology, and specifically provides a self-cleaning method for a surface cleaning device. Background Technology

[0002] With the improvement of people's living standards, various surface cleaning devices have gradually entered people's daily lives, providing great convenience for cleaning house floors. One type of existing surface cleaning device includes a cleaning roller, a dirt collection box, and a scraping guide mounted on the cleaning assembly. The cleaning roller rotates and contacts the surface to be cleaned to wipe it, while the scraping guide scrapes the rotating cleaning roller, removing the dirt adsorbed by the cleaning roller and allowing it to flow into the dirt collection box. Another type of surface cleaning device integrates the dirt collection box and water tank into the body with a handle. This requires a suction motor, which is located on the body. A suction channel is set within the cleaning assembly, and a suction port is located at the bottom of the cleaning assembly. With the assistance of the cleaning roller, the suction motor draws dirt from the cleaning roller and the ground through the suction port and suction channel into the dirt collection box on the body.

[0003] To facilitate the cleaning of the cleaning rollers in surface cleaning devices, more and more surface cleaning devices are equipped with cleaning components. When the cleaning rollers need cleaning, the surface cleaning device is placed in the cleaning tank of the cleaning component, and the rotating cleaning rollers can complete the self-cleaning process. Although existing surface cleaning devices can use cleaning components to complete the self-cleaning of the cleaning rollers, they cannot automatically clean the roller brush cavity and roller brush cover, especially the area near the scraper. Over time, bacteria will grow and odors will be emitted, resulting in a poor customer experience. Patent application number 202010496571.4, entitled "Self-cleaning method of mopping machine, computer-readable storage medium and mopping machine", discloses a self-cleaning method of mopping machine, a computer-readable storage medium and a mopping machine. The self-cleaning method of the mopping machine includes: controlling the motor of the mopping machine to start in response to a self-cleaning command; controlling the motor to drive the roller brush of the mopping machine to rotate alternately in both directions for a first duration. This invention utilizes a motor to drive the roller brush in alternating forward and reverse directions. This achieves self-cleaning of the roller brush, eliminating the need for manual cleaning and enhancing the robot's intelligence and user-friendliness. Furthermore, the alternating operation of the roller brush cleans the robot's wringing mechanism, preventing debris accumulation on its back and ensuring internal cleanliness. While this self-cleaning method addresses the issue of intelligence and user-friendliness, relying solely on alternating forward and reverse operation significantly improves the cleaning effect on the roller brush. Without improving the water flow during self-cleaning, the turbulent flow created by the roller brush's reversal only cleans the fixed areas the liquid frequently passes through, limiting its effectiveness in cleaning debris accumulated on the back of the wringing mechanism. Additionally, even with alternating rotation, the cleaning of the spray nozzle, suction port, and the surrounding roller brush chamber, as well as the corners of the brush chamber, remains inadequate. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this application provides a self-cleaning method for a surface cleaning device. This cleaning method can perform centralized cleaning of the roller brush cavity after the cleaning roller has been automatically cleaned, and the cleaning effect is good.

[0005] A cleaning method for a surface cleaning device, the surface cleaning device comprising a floor brush with a roller brush cavity, a liquid supply assembly, a cleaning assembly, and a sludge extraction assembly, the cleaning assembly comprising a cleaning roller disposed within the roller brush cavity, the floor brush further comprising a roller brush cover covering the roller brush cavity, the floor brush having scrapers that abut against the bristles on the cleaning roller, the cleaning roller rotating, the scrapers squeezing and scraping the bristles on the cleaning roller to form a variable liquid flow channel through which the liquid flows, the cleaning roller and the scrapers dividing the roller brush cavity into a liquid flow buffer cavity located above the scrapers and a sludge temporary storage cavity located below the scrapers, the sludge temporary storage cavity being connected to the liquid flow buffer cavity through a flow-limiting channel, the cleaning method comprising:

[0006] S1 - Cleaning roller reverse cleaning steps: The cleaning roller reverses, the reverse time is t1, the scraper squeezes and scrapes the brush bristles, the liquid flow moves along the rotation direction of the cleaning roller, part of the liquid flow dynamically closes the flow restriction channel, so that the liquid flow accumulates in the liquid flow buffer chamber, continuously buffers the flow, and washes the inner wall of the cleaning roller and the roller brush chamber.

[0007] Furthermore, when the cleaning roller reverses, a portion of the liquid flow dynamically closes the flow-limiting channel, causing the liquid flow to accumulate in the liquid flow buffer chamber. At the same time, the variable liquid flow channel is closed by the accumulated liquid flow. Driven by the cleaning roller, a portion of the liquid flow in the flow buffer chamber moves tangentially along the cleaning roller, surges towards the roller brush cavity wall, and then turns back and collides with the liquid flow that continues to move tangentially along the cleaning roller, repeatedly rinsing the inner wall of the cleaning roller and the roller brush cavity. The width of the flow-limiting channel is between 0.4 mm and 2 mm.

[0008] Furthermore, the cleaning method also includes the step of the cleaning roller rotating in the forward direction, the cleaning roller rotating in the direction away from the brush cavity, the scraper squeezing and scraping the bristles on the cleaning roller, so that the liquid flow flows in the liquid flow buffer cavity along the forward movement direction of the cleaning roller, the cleaning roller rotates in the forward direction for t2, and the dirt and / or liquid scraped off by the scraper is sent into the dirt storage cavity through the variable liquid flow channel and the flow restriction channel, and then is sucked away under the action of the dirt suction component.

[0009] Furthermore, the cleaning method further includes a step of forward rotation of the cleaning roller, after step S1, the cleaning roller rotates forward for a second time t2, and the cleaning ends; or, the cleaning method further includes a step of forward rotation of the cleaning roller, before step S1, the cleaning roller first rotates forward for a second time t2, and the cleaning roller reverses for a first time t1, and the cleaning ends; or, the cleaning method further includes a step of forward rotation of the cleaning roller, the forward rotation step and the reverse rotation step are performed alternately, and the cleaning ends after time T1.

[0010] Furthermore, the cleaning method also includes an S0-liquid supply step: a step in which the liquid supply component provides cleaning liquid for cleaning.

[0011] Furthermore, step S0 is set before the cleaning roller rotates; or step S0 is set during the rotation of the cleaning roller.

[0012] Furthermore, the cleaning method also includes a sludge extraction step: the sludge or liquid in the sludge storage chamber enters the sludge collection bucket set on the machine body from the sludge suction port on the floor brush under the action of the sludge extraction component.

[0013] Furthermore, the sludge extraction step is set in the S1-cleaning roller reverse cleaning step; or, the sludge extraction step is set after the S1-cleaning roller reverse cleaning step; or, the sludge extraction step is performed alternately with the S1-cleaning roller reverse cleaning step.

[0014] Furthermore, when the cleaning roller rotates forward, the liquid supply assembly provides cleaning fluid at a first flow rate, and when the cleaning roller rotates in reverse, the liquid supply assembly provides cleaning fluid at a second flow rate, wherein the second flow rate is greater than the first flow rate.

[0015] Furthermore, the roller brush cover includes a fixed end connected to the roller brush cavity and a suspended end. The suspended end extends downward to at least partially cover the cleaning roller. The suspended end extends downward along the roller brush to be tangent to the bristles. A dirt storage cavity is formed between the inner wall of the roller brush cavity below the scraper and between the scraper and the cleaning roller. The roller brush cover, the inner wall of the roller brush cavity above the scraper, and the space between the scraper and the cleaning roller form a liquid flow buffer cavity.

[0016] The beneficial effects of adopting the above technical solution are:

[0017] 1. The automatic cleaning process of the surface cleaning device includes a step S1 - cleaning roller reversal self-cleaning: the cleaning roller reverses for a time t1, the scraper squeezes and scrapes the bristles, and the liquid flows along the rotation direction of the cleaning roller. Part of the liquid dynamically closes the flow-limiting channel, causing the liquid to accumulate in the flow buffer chamber, continuously buffering the flow and rinsing the inner walls of the cleaning roller and brush cavity. When the cleaning roller reverses, the cleaning fluid moves towards the brush cavity. The scraper continuously squeezes and scrapes the bristles, and the scraped liquid flows along the rotation direction of the cleaning roller. Under the action of centrifugal force, it is thrown forward along the tangential direction of the cleaning roller, i.e., towards the cavity wall of the brush cavity. As the liquid flows in the reverse direction following the cleaning roller, it gets closer and closer to the brush cavity wall, and more and more liquid accumulates near the brush cavity wall. Therefore, the flow-limiting channel is dynamically closed by the liquid flow. At this time, the flow-limiting channel is continuously flushed by the flowing liquid, forming a liquid seal. Only a small portion of the liquid flows through the flow-limiting channel into the dirt storage chamber, allowing most of the liquid to pass through. The liquid continuously accumulates in the liquid flow buffer chamber, ensuring that the liquid flow buffer chamber forms a good dynamic closed cavity. This allows the liquid flow accumulated in most of the liquid flow buffer chamber to be continuously thrown by the cleaning roller towards the cavity wall of the roller brush cavity, and then reflected back by the roller brush cavity wall. It then collides and mixes with the liquid flow that continues to move tangentially along the cleaning roller. In this way, the liquid flow repeatedly washes the cleaning roller and roller brush cavity, especially the cavity wall of the roller brush cavity near the spray nozzle, so that dirt does not accumulate near the spray nozzle. This not only ensures that the spray nozzle sprays water normally, but also concentrates and repeatedly cleans the roller brush cavity, realizing automatic cleaning of the cleaning components with good cleaning effect.

[0018] 2. When the cleaning roller reverses, a portion of the liquid flow dynamically closes the flow-limiting channel, causing the liquid to accumulate in the flow buffer chamber. Simultaneously, the variable flow channel is closed by the accumulated liquid. Driven by the cleaning roller, a portion of the liquid in the flow buffer chamber moves tangentially along the cleaning roller, rushing towards the brush cavity wall. It then folds back and collides with the liquid continuing to move tangentially along the cleaning roller, repeatedly washing the inner walls of the cleaning roller and the brush cavity. The width of the flow-limiting channel is between 0.4 mm and 2 mm. Because both the variable flow channel and the flow-limiting channel are dynamically closed by the liquid flow, the dynamic closure of the flow buffer chamber is more effectively ensured during the first period of the cleaning roller's rotation. This allows most of the liquid to repeatedly collide and mix within the flow buffer chamber, rinsing the cleaning roller and the brush cavity, thus improving the self-cleaning effect of the surface cleaning device, especially for the brush cavity.

[0019] 3. The cleaning method involves the following steps: the cleaning roller rotates forward, the scraper squeezes and scrapes the bristles on the cleaning roller, causing the liquid to flow in the liquid buffer chamber along the forward movement direction of the cleaning roller. The forward rotation time of the cleaning roller is t2. The dirt and / or liquid scraped off by the scraper are sent into the dirt storage chamber through the variable liquid flow channel and the flow restriction channel, and then are drawn away by the dirt suction component. This method ensures that the cleaning roller itself is cleaned more thoroughly, while also guaranteeing that the scraper and flow-limiting channels are continuously rinsed by the flowing liquid. The scraped-off dirt or debris immediately enters the dirt storage chamber through the variable flow channel and flow-limiting channel. Simultaneously, most of the liquid flows with the rotation of the cleaning roller, moving away from the brush cavity. Under the action of the cleaning roller and the suction component, it is continuously drawn into the dirt storage chamber from below the cleaning roller, following its rotation direction. This prevents dirt or debris from lingering in the flow buffer chamber. Once the liquid has finished rinsing the cleaning roller and brush cavity in the flow buffer chamber, it immediately enters the dirt storage chamber and continues to flow there. Under the action of the cleaning roller and the suction component, it is continuously drawn from the suction port and sent to the floor brush's waste collection bin. This dynamic flow ensures that the flow buffer chamber, dirt storage chamber, cleaning roller, and flow-limiting channels are all thoroughly cleaned, resulting in excellent rinsing performance.

[0020] 4. By including a fixed end connected to the brush cavity and a suspended end in the brush cover, with the suspended end extending downwards to at least partially cover the cleaning roller, and the suspended end extending downwards along the brush to be tangent to the bristles, a dirt storage cavity is formed between the inner wall of the brush cavity below the scraper and between the scraper and the cleaning roller. The space between the brush cover, the inner wall of the brush cavity above the scraper, and the scraper and the cleaning roller forms a liquid flow buffer cavity. This structural arrangement allows for better dynamic sealing of the liquid flow buffer cavity when the cleaning roller reverses, ensuring that the brush cavity is repeatedly and dynamically cleaned by the flowing liquid during the reverse rotation of the cleaning roller. It also ensures that during the forward rotation of the cleaning roller, dirt or contaminants can either follow the rotation of the cleaning roller or enter the dirt storage cavity through the variable liquid flow channel and the flow restriction channel. The flowing liquid will not linger in the dirt storage cavity for a long time, thereby ensuring the self-cleaning effect of the cleaning roller, the entire brush cavity, and the brush cover. This makes the self-cleaning function of the surface cleaning device more complete and the cleaning effect better. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is the first embodiment of the surface cleaning device;

[0023] Figure 2 yes Figure 1 A cross-sectional view of the floor brush in the image;

[0024] Figure 3 This is a schematic diagram of the movement of the liquid flow in the liquid flow buffer chamber when the cleaning roller reverses;

[0025] Figure 4 This is a schematic diagram of the liquid flow movement when the cleaning roller rotates forward.

[0026] Figure 5 This is a top view of a floor brush without a roller cover.

[0027] Figure 6 yes Figure 5 Enlarged view of point A in the middle;

[0028] Figure 7 This is a second embodiment of the surface cleaning device;

[0029] Figure 8 This is a cross-sectional view of the floor brush placed on the cleaning seat in Embodiment 2;

[0030] Figure 9 This is a third embodiment of the surface cleaning device;

[0031] The names of the components listed are as follows:

[0032] 1. Floor brush; 11. Roller brush cavity; 111. Upper cavity wall; 112. Lower cavity wall; 113. First channel; 114. Second channel; 12. Scraper blade; 13. Suction port; 131. Flaring opening; 132. Closing opening; 14. Spray nozzle; 15. Roller brush cover; 151. Fixed end; 152. Suspended end; 20. Central axis; 2. Cleaning assembly; 21. Cleaning roller; 211. Brush bristles; 3. Liquid supply assembly; 31. Clean water tank; 14. Sludge suction assembly; 41. Sludge suction motor; 42. Sludge container; 50. Liquid flow buffer chamber; 60. Sludge temporary storage chamber; 7. Machine body; 8. Cleaning seat; 81. Cleaning tank; 9. Floor scraper. Detailed Implementation

[0033] In this invention, the forward rotation of the cleaning roller means that the cleaning roller rotates in the direction away from the brush cavity. That is, when a person stands on the right side of the surface cleaning device, the direction in which the cleaning roller rotates counterclockwise is the forward rotation. Similarly, the reverse rotation of the cleaning roller means that the cleaning roller rotates in the direction of the brush cavity. That is, when a person stands on the right side of the surface cleaning device, the direction in which the cleaning roller rotates clockwise is the reverse rotation.

[0034] Those skilled in the art should understand that the embodiments described below are merely a part of the embodiments of this application, and not all of the embodiments of this application. These partial embodiments are intended to explain the technical principles of this application and are not intended to limit the scope of protection of this application. Based on the embodiments provided in this application, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of this application.

[0035] It should be noted that in the description of this application, terms such as "center," "upper," "lower," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can also refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] Example 1

[0038] As a surface cleaning device described in this invention, such as Figures 1 to 6 As shown, the system includes a body 7, a floor brush 1 with a roller brush cavity 11 connected to the body 7, a liquid supply assembly 3, a cleaning assembly 2, and a sludge suction assembly 4. The cleaning assembly 2 includes a cleaning roller 21 disposed within the roller brush cavity 11. The floor brush 1 is also equipped with a drive motor (not shown in the figure) for driving the cleaning roller 21. The roller brush cavity 11 has a scraper 12, a sludge suction port 13, and a liquid spray port 14 on its cavity wall. The sludge suction assembly 4 includes a sludge suction motor 41 disposed within the body 7 and a sludge collection tank 42 disposed on the body 7. The body also contains a power source assembly, which includes a battery pack 711, a control board (not shown in the figure), a display device (not shown in the figure), and a sludge suction motor 41 disposed below the battery pack 711. In this embodiment, the battery pack 711, the control board, and the sludge suction motor... All components 41 are housed within the casing of the machine body. The display device is located at the upper port of the casing of the machine body. The liquid supply assembly 3 includes a clean water tank 31 and a water supply device (not shown in the figure) for supplying water from the clean water tank 31 to the cleaning roller 21, as well as a liquid supply pipeline (not shown in the figure). The floor brush 1 is also equipped with a floor scraper 9. The floor brush 1 is equipped with a liquid supply pipeline, which is connected to the spray nozzle 14 on the floor brush 1. Water is supplied to the cleaning roller 21 or the surface to be cleaned through the spray nozzle 14 to wet the cleaning roller 21 or the surface to be cleaned, so that the bristles 211 of the cleaning roller 21 can clean the surface to be cleaned. The floor brush 1 is also equipped with a suction pipe, which is connected to the suction port 13 to suck the dirt or debris in the roller brush cavity 11 from the suction port 13 into the suction pipe and send it into the dirt container 42. The scraper 12 abuts against the bristles 211 of the cleaning roller 21. The roller brush cavity 11 is divided into a liquid flow buffer cavity 50 and a dirt storage cavity 60 by the cleaning roller 21 and the scraper 12. When the cleaning roller 21 moves, the scraper 12 squeezes and scrapes the bristles 211 to form a variable liquid flow channel for liquid to pass through, allowing the liquid to flow from the liquid flow buffer cavity 50 into the dirt storage cavity 60. The roller brush cavity 11 also has a flow-limiting channel connecting the liquid flow buffer cavity 50 and the dirt storage cavity 60, wherein the width of the flow-limiting channel is between 0.4 and 2 mm. In this embodiment, as... Figure 2 and Figure 6As shown, the roller brush cavity 11 includes an upper cavity wall 111, a lower cavity wall 112, a bottom wall 115, and left and right side walls 116. The suction port 13 is disposed on the lower cavity wall 112. The lower cavity wall 112, the scraper 12, and the cleaning roller 21 form a temporary dirt storage cavity 60 surrounding the suction port 13. The scraper 12 forms first channels 113 on both sides with the left and right side walls 116 of the roller brush cavity 11, and the cleaning roller 21 forms second channels 114 on both sides with the left and right side walls 116 of the roller brush cavity 11. The flow-limiting channel is the first channel 113 between the scraper 12 and the floor brush 1. The width of the first channel is α, 0.4mm≤α≤0.8mm. Since the liquid flow passes through two channels separately, the width of the first channel here refers to the width of any one of the first channels 113. Since there is a gap between the scraper and the left and right side walls of the floor brush, the width of the first channel here refers to the gap between one end of the scraper and one side of the floor brush. The gap is 0.8mm, so the width of the first channel α is 0.6mm. The roller brush cavity 11 includes an upper cavity wall 111 and a lower cavity wall 112. The suction port 13 is disposed on the lower cavity wall 112. The lower cavity wall 112, the scraper 12, and the cleaning roller 21 form a temporary dirt storage cavity 60 surrounding the suction port 13. A second channel 114 is provided between the two sides of the cleaning roller 21 and the floor brush 1. The flow limiting channel also includes a second channel 114. The width of the second channel 114 is b, 1mm≤b≤2mm. In this embodiment, the width b of the second channel is 1.8mm.

[0039] The floor brush 1 also includes a roller brush cover 15 covering the cleaning roller, such as Figures 2 to 6As shown, the spray nozzle 14 is located on the upper cavity wall 111. The roller brush cover 15 includes a fixed end 151 connected to the roller brush cavity 11 and a suspended end 152. The suspended end 152 extends downward to the central axis of the cleaning roller, parallel to the tangent of the cleaning roller, and has a certain distance from the cleaning roller. The distance between the suspended end 152 and the bristles 211 is θ, 4≤θ≤6mm, which is 4mm in this embodiment. The roller brush cover 15, the upper cavity wall 111, the scraper 12, and the cleaning roller 21 form a liquid flow buffer cavity 50. This structural design allows the liquid flow to smoothly flow out of the liquid flow buffer cavity when it follows the cleaning roller in a forward rotation. That is, a large amount of liquid flow can quickly flow out from the space between the suspended end and the cleaning roller. The liquid flows through the center, following the cleaning roller and entering the waste storage chamber through the gap between the cleaning roller and the floor scraper. Under the action of the suction motor, it is sent into the waste collection bucket through the suction port and suction pipe. When the cleaning roller reverses, it rotates normally. Since the suspended end of the roller brush cover is parallel to the tangent of the cleaning roller, the liquid flowing to the suspended end is also thrown into the suspended end of the roller brush cover under the action of the centrifugal force of the cleaning roller. Under the guidance of the roller brush cover, a large amount of liquid is also carried by the cleaning roller into the liquid flow buffer chamber. Combined with the dynamic sealing of the flow channel, the liquid flow buffer chamber forms a dynamic closed chamber, which further ensures that a large amount of liquid flows in the liquid flow buffer chamber to continuously clean the cleaning roller, roller brush chamber and roller brush cover.

[0040] In this embodiment, the lower cavity wall 112 is an inclined surface that slopes from the periphery to the center, and the suction port 13 is located at the center of the lower cavity wall 112. This structure not only ensures the suction force of the suction component for sewage or dirt, but also provides better guidance for the flow of sewage or dirt, and makes the lower cavity wall and suction port easier to clean. At the same time, the suction port 13 is funnel-shaped, with the flared opening 131 of the suction port 13 facing the roller brush cavity and connected to the lower cavity wall. The lower cavity wall 112 contracts from the periphery to the suction port 13, and the constricted opening 132 of the suction port 13 extends into the floor brush 1, so that the lower cavity wall has a guiding effect on sewage or dirt. Under the suction force of the suction component, sewage or dirt can be more easily sucked in from the suction port. At the same time, this structure is simple and easy to implement. The upper cavity wall 111 is an inclined surface with higher upper and lower sides and a lower center. The spray nozzle 14 is located at the center of the two inclined surfaces. This structural arrangement allows the inclined surface to guide the liquid flow when the liquid flows in the liquid flow buffer cavity. In addition to ensuring the cleaning effect of the cleaning roller, it can concentrate more liquid flow and scouring between the spray nozzle area and the cleaning roller, thus ensuring the cleaning effect of the spray nozzle and its surrounding area.

[0041] The surface cleaning device of this embodiment can operate according to the following procedure when cleaning the surface to be cleaned:

[0042] Liquid is supplied by the liquid supply assembly. The cleaning roller rotates forward, wetting the bristles on the cleaning roller. The scraper squeezes and scrapes the bristles on the cleaning roller, causing the liquid to flow in the liquid flow buffer chamber along the direction of movement of the cleaning roller, thereby wetting the bristles of the cleaning roller. The cleaning roller rotates forward to continuously clean the surface to be cleaned. The dirt and / or liquid scraped off by the scraper is sent into the dirt storage chamber through the variable liquid flow channel and the flow restriction channel. At the same time, the suction motor works. Under the action of the suction motor, the dirt or liquid that has entered the dirt storage chamber is sent from the suction port through the suction channel into the dirt collection bucket. The cleaning roller rotates forward for a certain period of time to complete the cleaning work of the surface to be cleaned.

[0043] When automatic cleaning of the surface cleaning device is required, the surface cleaning device is stopped from moving, the cleaning roller is detached from the surface to be cleaned, the surface cleaning device is placed on the cleaning tank, and the automatic cleaning function of the surface cleaning device is activated. The surface cleaning machine then starts automatic cleaning operation, as follows:

[0044] 1) Step S0 - Liquid supply component liquid supply stage: At this time, first turn on the liquid supply device and send the cleaning liquid in the water tank to the spray nozzle through the liquid supply pipeline to spray onto the cleaning roller or cleaning tank.

[0045] 2) Step S2 - Cleaning Roller Forward Rotation Cleaning Stage: The liquid supply component continues to supply liquid, and then the drive motor is turned on. The drive motor drives the cleaning roller to rotate forward. The scraper squeezes and scrapes the bristles on the cleaning roller, causing the liquid to flow in the liquid flow buffer chamber along the forward rotation direction of the cleaning roller. At the same time, the dirt and / or sewage scraped off by the scraper is sent into the dirt storage chamber through the variable liquid flow channel and the flow restriction channel. During this process, the sewage suction motor starts at the same time. The property or dirt entering the sewage storage chamber enters the sewage suction pipe from the sewage suction port under the action of the sewage suction motor and is sent into the sewage collection tank. The forward rotation time of the cleaning roller is t2. The liquid supply component provides cleaning liquid at the first flow rate Q1. The cleaning roller stops rotating forward, and then the sewage suction motor stops working.

[0046] Because the cleaning roller rotates in the direction away from the brush cavity, and because the brush cover covers the cleaning roller and its suspended end extends downward to the central axis of the cleaning roller, most of the liquid flow moves in the direction of the cleaning roller's rotation within the liquid flow buffer chamber. Driven by the cleaning roller, it is thrown out tangentially by the cleaning roller. Guided by the brush cover, the liquid flow flows out from the liquid flow buffer chamber and enters the waste storage chamber through the gap between the cleaning roller and the floor scraper below the cleaning roller. A small portion of the liquid flow is scraped off by the scraper and enters the waste storage chamber through the variable liquid flow channel and the flow restriction channel. As the suction motor starts simultaneously, the waste liquid or waste entering the waste storage chamber enters the suction pipe from the suction port under the action of the suction motor and is sent into the waste collection bucket. Thus, the bristles on the cleaning roller are cleaned. Because the liquid flow in the liquid flow buffer chamber is constantly flowing dynamically, the cleaning roller is cleaned, and the brush cavity is also initially cleaned.

[0047] 3) After the cleaning roller rotates forward to finish the cleaning stage, the process proceeds to step S1 - the cleaning roller reverses to clean the brush cavity stage: the drive motor is turned on, and the drive motor drives the cleaning roller to rotate in reverse for a time of t1. At this time, the liquid supply device is started, and the liquid supply component provides cleaning liquid at a second flow rate. The scraper squeezes and scrapes the brush bristles, and the liquid flow moves along the rotation direction of the cleaning roller. Part of the liquid flow dynamically closes the flow restriction channel, causing the liquid flow to accumulate in the liquid flow buffer cavity, continuously buffering the flow and rinsing the inner wall of the cleaning roller and the brush cavity. Then the liquid supply device stops supplying liquid, the drive motor stops rotating in reverse, the second flow rate is greater than the first flow rate, and t1 = t2.

[0048] Since the cleaning roller rotates in reverse towards the brush cavity, and the second flow rate is equal to the first flow rate, the liquid supply device continues to wet the cleaning roller after startup. Although the second flow rate is equal to the first flow rate, the brush bristles of the cleaning roller have already been wetted during the forward rotation cleaning phase, so there is no need to increase the water supply time to ensure the cleaning effect. At the same time, the cleaning roller has been initially cleaned, so most of the liquid remains on the surface of the bristles, and the liquid is not very dirty at this time, making the reverse rotation cleaning of the cleaning roller easier, and the cleaning can still meet the requirements. Figure 3 As shown, the liquid flow follows the cleaning roller towards the brush cavity, getting closer and closer. The scraper continuously squeezes and scrapes the bristles, scraping off more liquid. A small portion enters the dirt storage chamber through the variable flow channel, the first channel, and the second channel. The majority of the liquid is propelled tangentially by the centrifugal force of the cleaning roller, spraying onto the upper wall of the brush cavity. It is then reflected back by the upper wall and the brush cover, colliding with the liquid continuing to move with the cleaning roller. The liquid accumulates in the flow buffer chamber. The width α of the flow-limiting channel is 0.8 mm. Therefore, when the liquid flow is relatively abundant (the cleaning roller is already soaked during the first forward rotation; when it reverses, the liquid flow is more than during the forward rotation), the first channel can be dynamically closed by a portion of the liquid flow, while the majority remains unaffected. The liquid flow moves and collides within the liquid flow buffer chamber, repeatedly rinsing the roller brush chamber, cleaning roller, and roller brush cover. Because the flow-limiting channel is dynamically closed by the liquid flow, the liquid flow buffer chamber forms a dynamically closed chamber. The cleaning roller is continuously scraped and cleaned, and the roller brush chamber and roller brush cover are continuously and dynamically rinsed by the liquid flow concentrated and buffered by the liquid flow buffer. Since the spray nozzle is located on the upper cavity wall and at its lowest position, the area near it is also an area where liquid flow accumulates more. Therefore, the spray nozzle and its surrounding area are rinsed more thoroughly. The back side of the scraper is continuously rinsed by the liquid flow reflected from the roller brush chamber and roller brush cover, thus the back side of the scraper is also thoroughly cleaned. In this way, the automatic cleaning of the entire roller brush chamber, roller brush cover, and cleaning roller is completed. The self-cleaning of the cleaning components is more thorough and intelligent.

[0049] 4) After the cleaning roller reverses the cleaning stage, the process proceeds to step S3 - the sludge extraction stage: the drive motor starts again to drive the cleaning roller to rotate forward, and at the same time the sludge extraction motor starts. The sludge or sludge in the sludge storage chamber enters the sludge collection bucket set on the floor brush from the sludge extraction port on the floor brush under the action of the sludge extraction component. The working time of the sludge extraction motor is t3, and t3 is less than t1.

[0050] Because the cleaning roller rotates forward, the liquid supply device stops working, and the cleaning roller, brush cavity, and brush cover have all been cleaned, leaving little dirt or liquid residue. Therefore, pumping out the waste becomes relatively easy and can be completed quickly, saving considerable time. Figure 4 As shown, at this time, the scraper blades squeeze and scrape the bristles on the cleaning roller, causing the liquid remaining on the bristles to be scraped off. The liquid that is not scraped off continues to flow in the liquid buffer chamber along the forward rotation direction of the cleaning roller, entering the waste storage chamber through the gap between the cleaning roller and the floor scraper. At the same time, the waste and / or liquid scraped off by the scraper blades are sent into the waste storage chamber through the variable flow channel and the flow restriction channel. During this process, the suction motor starts simultaneously. The liquid entering the waste storage chamber enters the suction pipe from the suction port under the action of the suction motor and is sent into the waste collection tank. The cleaning roller is then cleaned again, and the waste produced after cleaning is sent into the waste collection tank. Then the drive motor stops working, and the cleaning roller is spun dry. Then the suction motor stops working, and the automatic cleaning operation ends.

[0051] Understandably, for the structure of the roller brush cavity, we can also adopt such a solution: the outer periphery of the lower cavity wall is a curved surface with a high center and a low center, and the suction port is located in the center of the lower cavity wall. This structure is conducive to attracting liquid or dirt to the suction port, which facilitates the suction effect of the suction component and also ensures the cleaning of the suction port and its surrounding area. Such solutions do not depart from the concept of this invention and are all within the protection scope of this invention. They will not be listed one by one here.

[0052] Understandably, the upper cavity wall is an inclined surface, and the angle between the upper cavity wall and the scraper is α, where 90 ≥ α ≥ 60°. This ensures that the upper cavity wall guides the liquid flow, allowing the liquid to clean the back side of the scraper. Alternatively, the upper cavity wall is a curved surface with higher upper and lower sides and a lower center, with the spray nozzle located at the center of the curved surface. Both structures guide the liquid flow within the spray nozzle and its vicinity of the cleaning roller and brush cavity, ensuring cleaning of the inner wall of the brush cavity. These structures, without departing from the concept of this invention, are all within the scope of protection of this invention, and will not be listed here.

[0053] The self-cleaning method of the present invention sets the cleaning roller reversal cleaning stage after the cleaning roller forward cleaning stage, and includes a suction step after the cleaning roller reversal cleaning. This ensures that the cleaning device first cleans the dirtiest cleaning roller, and simultaneously removes dirt or liquid. Even if a small amount of dirt remains on the roller brush cavity wall and roller brush cover, the initial cleaning during the forward cleaning makes the subsequent cleaning roller reversal cleaning easier. Furthermore, since the cleaning roller is already wetted during forward cleaning, the flow-limiting channel can be quickly cleaned by the reversal cleaning. The dynamic sealing of the flow buffer chamber allows for rapid sealing, with the liquid accumulating within and continuously flushing the roller brush chamber and cover. After cleaning, a sludge extraction stage is implemented, preventing contaminants from remaining in the temporary contaminant storage chamber for too long. This also avoids prolonged moisture retention in the cleaning roller and brush chamber, allowing them to dry more easily. Because the cleaning is more thorough, mold and odor are less likely to develop. Therefore, this cleaning method ensures a more thorough cleaning of the surface cleaning device, resulting in a better customer experience.

[0054] Of course, it is understandable that we can also add a sludge removal step after the cleaning roller finishes rotating forward, and then perform the cleaning roller reverse cleaning step, which makes the cleaning roller reverse cleaning easier. In order to further improve the cleanliness and effect of cleaning, we can also alternate the cleaning roller reverse cleaning step and the sludge removal step, or alternate the cleaning roller forward cleaning step and the cleaning roller reverse cleaning step multiple times, and then perform the sludge removal step. All of these do not deviate from the concept of the self-cleaning method of this invention and are within the protection scope of this invention. They will not be listed one by one here.

[0055] Example 2:

[0056] The difference between this embodiment and Embodiment 1 is the structure of the floor brush. The automatic cleaning method of the surface cleaning device described in this invention is also different.

[0057] As the surface cleaning device described in the invention, such as Figure 7 As shown, it also includes an independent power source assembly 71, which is detachably mounted on the body 7. When detached and combined with the dustbin, the power source assembly can be used as a vacuum cleaner. When mounted on the body 7, it provides power to the floor scrubber. In this embodiment, the floor brush structure is as follows... Figure 8As shown, it also includes a roller brush cover 15 covering the cleaning roller 21. The suspended end of the roller brush cover extends below the central axis of the cleaning roller, and the distance θ between the roller brush cover and the cleaning roller is 5mm. The flow-limiting channel includes a first channel 113 between the two sides of the scraper 12 and the floor brush 1, and a second channel 114 between the two sides of the cleaning roller 21 and the floor brush 1. The width of the second channel 114 is b, where 1mm ≤ b ≤ 2mm. In this embodiment, the width a of the first channel 113 is 0.4mm, and the width b of the second channel 114 is 1.2mm. This mechanism facilitates the dynamic sealing of the liquid flow buffer chamber, thereby ensuring the automatic cleaning effect of the surface cleaning device.

[0058] In this embodiment, during the self-cleaning process, when the cleaning roller rotates in reverse, the liquid supply device supplies liquid at a second flow rate; when the cleaning roller rotates forward, the liquid supply device supplies liquid at a first flow rate, and the second flow rate is greater than the first flow rate. At the same time, the values ​​of the first and second channels are both small, which facilitates the rapid dynamic closure of the first and second channels by the liquid flow, so that the liquid flow buffer chamber is in a dynamic liquid-sealed state. The liquid flow continuously flows in the liquid flow buffer chamber to rinse the roller brush cover, roller brush cavity, and cleaning roller, thereby enabling the liquid flow to quickly close the variable liquid flow channel. The liquid flow continuously accumulates and buffers the flow in the liquid flow buffer chamber, so that the roller brush cavity, roller brush cover, and cleaning roller can be quickly cleaned.

[0059] The width of the flow-limiting channel and the specific self-cleaning method of the surface cleaning device are as follows:

[0060] like Figure 7 and Figure 8 As shown, the surface cleaning device also includes a cleaning seat 8, on which a cleaning tank 81 is provided. When automatic cleaning of the surface cleaning device is required, the surface cleaning device is placed on the cleaning seat, so that the cleaning roller 21 is located in the cleaning tank 81 with a certain gap from the bottom of the tank 81. The automatic cleaning function of the surface cleaning device is then activated, and the surface cleaning machine starts automatic cleaning operation. The process is as follows:

[0061] 1) Step S0 - Liquid supply component liquid supply stage: At this time, first turn on the liquid supply device and send the cleaning liquid in the water tank to the spray nozzle through the liquid supply pipeline to spray onto the cleaning roller or cleaning tank.

[0062] 2) Then proceed to step S1 - the stage of cleaning roller reversal and cleaning roller brush cavity: turn on the drive motor, drive the cleaning roller to reverse, the reversal time is t1. At this time, the liquid supply device continues to work, the liquid supply component provides cleaning liquid at the second flow rate. Since the second flow rate is large at this time, although there are many flow restriction channels, the width of the flow restriction channels is limited. The width of the second channel is 1.2mm and the width of the first channel is 0.4mm. Therefore, some liquid flow can still quickly dynamically seal the first and second channels, so that the liquid flow accumulates rapidly in the liquid flow buffer cavity. The deformation of the variable liquid flow channel is also limited. Therefore, the variable liquid flow channel is also quickly dynamically sealed by the accumulated liquid flow. Driven by the cleaning roller, part of the liquid flow in the liquid flow buffer cavity moves tangentially along the cleaning roller, rushes to the roller brush cavity wall, and then turns back and collides with the liquid flow that continues to move tangentially along the cleaning roller, repeatedly washing the inner wall of the cleaning roller and the roller brush cavity. The drive motor stops reversing.

[0063] After the liquid supply device continues to operate, due to the larger second flow rate, the cleaning roller is thoroughly and quickly wetted. The cleaning roller rotates in reverse towards the brush cavity, causing the liquid flow, after wetting and soaking the bristles, to also move towards the brush cavity. The liquid flow gets closer and closer to the brush cavity, and the scraper continuously squeezes and scrapes the bristles, scraping off more liquid. A small portion enters the dirt storage chamber through the variable flow channel and the flow-limiting channel. The majority of the liquid flow, under the centrifugal force of the cleaning roller, is sprayed tangentially to the upper wall of the brush cavity and reflected back by the upper wall and the brush cover, colliding with the liquid flow continuing to move with the cleaning roller. The liquid flow accumulates in the flow buffer chamber. Since the widths of the first and second channels are relatively small, the flow-limiting channel is partially dynamically closed by the liquid flow. Most of the liquid flow moves and collides within the flow buffer chamber, repeatedly rinsing the brush cavity, the cleaning roller, and the brush cover. Because the flow-limiting channel is... The flow is dynamically closed. Because the flow rate is high while the flow rate through the variable flow channel is limited, the variable flow channel is also dynamically closed, creating a dynamic closed chamber for the flow buffer. Within this chamber, the cleaning roller is continuously cleaned by the dynamically buffered flow and scraped by the scraper. The roller brush cavity and roller brush cover are continuously and dynamically rinsed by the concentrated and buffered flow. Since the spray nozzle is located on the upper chamber wall at its lowest point, its vicinity is also an area where the flow rate is high. Therefore, the spray nozzle and its vicinity are rinsed more thoroughly. The back of the scraper is continuously rinsed by the flow rate reflected from the roller brush cavity and roller brush cover, thus cleaning the back of the scraper as well. This completes the automatic cleaning of the entire cleaning roller, roller brush cavity, roller brush cover, and cleaning roller itself. The self-cleaning of the cleaning components is more thorough and intelligent.

[0064] 3) After the cleaning roller reverse cleaning stage ends, the process proceeds to step S3 - the suction stage: the liquid supply device stops working, the drive motor restarts and drives the cleaning roller to rotate forward, and at the same time the suction motor starts. The dirt or liquid in the dirt storage chamber enters the dirt collection bucket set on the floor brush from the suction port on the floor brush under the action of the suction component. The working time of the suction motor is t3, and t3 is less than t1.

[0065] During the reverse rotation phase of the cleaning roller, the cleaning roller, brush chamber, and brush cover are thoroughly cleaned, and the liquid supply device stops operating. Upon entering the suction phase, the scraper blades squeeze and scrape the bristles on the cleaning roller, causing the liquid remaining on the bristles to be scraped off. The remaining liquid continues to flow in the liquid buffer chamber along the forward rotation direction of the cleaning roller, entering the waste storage chamber through the gap between the cleaning roller and the scraper blades. Simultaneously, the waste and / or liquid scraped off by the scraper blades are sent into the waste storage chamber through the variable flow channel and the flow-limiting channel. During this process, the suction motor starts simultaneously. The liquid entering the waste storage chamber is drawn into the suction pipe from the suction port by the suction motor and sent to the waste collection tank. The cleaning roller is then cleaned again, and the resulting waste liquid is sent to the waste collection tank. The drive motor then stops operating, and the cleaning roller is spun dry. Finally, the suction motor stops operating, and the automatic cleaning process ends.

[0066] Of course, it is understandable that a second scraper can also be provided on the inner side of the suspended end of the roller brush cover. The second scraper can also be made of rubber. In this way, the second scraper can work together with the cleaning roller to push the liquid flow to dynamically seal the liquid flow buffer cavity, thereby ensuring that the liquid flow repeatedly flows in the liquid flow buffer cavity to rinse the cleaning roller, the roller brush cavity and the roller brush cover, resulting in a better cleaning effect. Such solutions do not deviate from the concept of this invention and are all within the protection scope of this invention. They will not be listed one by one here.

[0067] The self-cleaning method of this invention directly sets up a cleaning roller reversal cleaning stage first, followed by a dirt suction stage. During the dirt suction stage, the cleaning roller also rotates forward to assist in dirt suction. In this process, the cleaning roller, which is the most difficult to clean, can still be rinsed again. This method is the most energy-efficient and saves the cleaning time the most. Because the liquid supply device provides a large flow rate during the cleaning roller reversal cleaning stage, and the width of the flow restriction channel is relatively small, the liquid flow buffer chamber can quickly form a dynamic closed chamber. The liquid flow can continuously rinse the cleaning roller, roller brush chamber, and roller brush cover within it, and the large flow rate ensures that the cleaning roller, roller brush chamber, and roller brush cover can be cleaned efficiently. The dirt or sludge after cleaning can also be treated in time. The cleaning and dirt suction efficiency is high, and the automatic cleaning time is short, which is convenient for customers with frequent cleaning needs. We can set a fast automatic cleaning function in the program of the surface cleaning device to make the surface cleaning device more functional and convenient for customers with different needs.

[0068] Example 3:

[0069] The structural difference between this embodiment and Embodiment 1 lies in the structure of the floor brush. The automatic cleaning method of the surface cleaning device described in this invention is also different.

[0070] As a floor brush in the surface cleaning device described in this invention, such as Figure 9 As shown, the floor brush 1 also includes a brush cover 15 covering the cleaning roller 21. The spray nozzle 14 is located on the brush cover 15. The upper cavity wall 111, the brush cover 15, the scraper 12, and the cleaning roller 11 form a liquid flow buffer cavity 50. Since the spray nozzle 14 is located on the brush cover 15, the spray nozzle 14 is less prone to getting dirty, and dirt is less likely to remain on it. This structure makes the brush cavity 11 easier to clean, and the brush cover can be removed, allowing for more thorough automatic cleaning of the spray nozzle area. Even if the spray nozzle area of ​​the brush cover is not completely cleaned during automatic cleaning, it is convenient for customers to disassemble it for deep cleaning, thus ensuring a comprehensive cleaning effect for the cleaning components. The flow-limiting channel includes a first channel 113 between the two sides of the scraper 12 and the floor brush 1, and a second channel 114 between the two sides of the cleaning roller 21 and the floor brush 1. The width of the second channel 114 is b, where 1mm ≤ b ≤ 2mm. In this embodiment, the width a of the first channel 113 is 0.6mm, and the width b of the second channel 114 is 1.5mm. The suspended end of the roller brush cover extends below the central axis of the cleaning roller. The distance θ between the suspended end of the roller brush cover and the cleaning roller is 6mm. The suspended end of the roller brush cover is also provided with a second scraper, which is a rubber scraper. The rubber scraper abuts against the cleaning roller. With this structure, the second scraper and the cleaning roller form a variable flow channel, further assisting the liquid flow in forming a liquid seal in the liquid flow buffer chamber, which is more conducive to the dynamic cleaning of the liquid flow buffer chamber and also further facilitates the cleaning of the cleaning roller. Furthermore, the roller brush cover is removable, and the second scraper on it helps the cleaning roller and the floor brush to clean themselves automatically. Even if a small amount of dust remains on the back of the second scraper, it is easy to clean because the roller brush cover is removable.

[0071] In this embodiment, the dirt extraction step of the self-cleaning method of the surface cleaning device is set in the S1-cleaning roller reverse cleaning step.

[0072] The surface cleaning device also includes a cleaning seat with a cleaning tank. When automatic cleaning is required, the surface cleaning device is placed on the cleaning seat, with the cleaning roller positioned inside the cleaning tank and a certain gap between it and the bottom of the tank. The automatic cleaning function of the surface cleaning device is then activated, and the surface cleaning machine begins its automatic cleaning operation. The process is as follows:

[0073] 1) Step S0 - Liquid supply component liquid supply stage: At this time, first turn on the liquid supply device and send the cleaning liquid in the water tank to the spray nozzle through the liquid supply pipeline to spray onto the cleaning roller or cleaning tank.

[0074] 2) The liquid supply device continues to work, and then enters step S1 - the stage of cleaning roller reversal to clean the brush cavity: the drive motor is turned on, and the drive motor drives the cleaning roller to reverse. The reversal time is t1, and the suction motor starts at the same time. The liquid supply component provides cleaning liquid at the second flow rate. Since the second flow rate is large at this time, and the width of the flow restriction channel is limited, and there is also the auxiliary effect of the second scraper, part of the liquid flow will quickly dynamically close the flow restriction channel, so that the liquid flow will quickly accumulate in the liquid flow buffer cavity. The deformation of the variable liquid flow channel is also limited. Therefore, the variable liquid flow channel is also quickly dynamically closed by the accumulated liquid flow. Driven by the cleaning roller, part of the liquid flow in the liquid flow buffer cavity moves along the tangential direction of the cleaning roller, rushes to the wall of the brush cavity, and then turns back and collides with the liquid flow that continues to move along the tangential direction of the cleaning roller, repeatedly washing the inner wall of the cleaning roller and the brush cavity, stopping the reversal, and then the suction motor continues to work for t4 and then shuts off.

[0075] Because the second flow rate is relatively large at this time, the liquid supply device continues to work, thoroughly and quickly wetting the cleaning roller. The cleaning roller rotates in reverse towards the brush cavity, causing the liquid, after wetting and soaking the bristles, to move towards the brush cavity along with the cleaning roller. The liquid gets closer and closer to the brush cavity, and the scraper continuously squeezes and scrapes the bristles, scraping off more liquid. A small portion enters the dirt storage chamber through the variable flow channel and the flow-limiting channel. The majority of the liquid is propelled tangentially by the centrifugal force of the cleaning roller, spraying it onto the upper wall of the brush cavity and being reflected back by the upper wall and the brush cover, continuing to move with the cleaning roller. The moving liquid flows collide with each other, accumulating within the liquid flow buffer chamber. Due to the limited width of the flow-limiting channel, it is partially dynamically closed by the liquid flow. Most of the liquid flows move and collide within the buffer chamber, repeatedly rinsing the roller brush chamber, cleaning roller, and roller brush cover. Because the flow-limiting channel is dynamically closed, and the flow rate is relatively high while the flow rate through the variable flow channel is limited, the variable flow channel is also dynamically closed. Therefore, the liquid flow buffer chamber forms a dynamically closed chamber. Within this chamber, the cleaning roller is continuously cleaned again by the dynamically buffered liquid flow. Because the suspended end of the roller brush cover extends below the central axis of the cleaning roller, the liquid flow buffer chamber is relatively large, allowing for a greater accumulation of liquid flow. This results in a more thorough and continuous dynamic rinsing of the roller brush cavity and cover by the concentrated and buffered liquid flow. Since the spray nozzle is located on the upper cavity wall, at its lowest point, its surrounding area is also a region where liquid flow accumulates significantly. Therefore, the spray nozzle and its surrounding area are rinsed more thoroughly. Meanwhile, the back of the scraper blade is continuously rinsed by the liquid flow reflected from the roller brush cavity and cover, thus also cleaning it. Furthermore, the simultaneous operation of the suction motor further enhances the cleaning process. While the washing roller brush chamber, cleaning roller, and roller brush cover are being cleaned, the dirt or sludge entering the dirt storage chamber is also sent into the container through the suction port and suction pipe. Therefore, the dirt removal work is completed while the washing roller brush chamber, cleaning roller, and roller brush cover are being cleaned. Thus, the automatic cleaning of the entire cleaning roller, roller brush chamber, roller brush cover, and cleaning roller is completed. The self-cleaning of the surface cleaning device is more thorough and intelligent. The automatic cleaning and dirt removal at the same time makes the cleaning effect better. Because the dirt or sludge removed in the initial cleaning is sucked away, it is easier for the newly provided liquid flow to continue cleaning, which will not cause secondary pollution and the cleaning effect is better.

[0076] 3) Step S2 - Cleaning Roller Forward Rotation Cleaning Stage: The liquid supply component continues to supply liquid, and then the drive motor is turned on. The drive motor drives the cleaning roller to rotate forward. The forward rotation time of the cleaning roller is t2. The liquid supply component provides cleaning liquid at a first flow rate Q1. The scraper squeezes and scrapes the bristles on the cleaning roller, causing the liquid to flow in the liquid flow buffer chamber along the forward rotation direction of the cleaning roller. At the same time, the dirt and / or dirty liquid scraped off by the scraper is sent into the dirt storage chamber through the variable liquid flow channel and the flow restriction channel. During this process, the suction motor starts at the same time. The property or dirt entering the dirt storage chamber enters the suction pipe from the suction port under the action of the suction motor and is sent into the dirt collection bucket. The cleaning roller stops rotating forward, and then the suction motor stops working. At this point, the automatic cleaning work of the surface cleaning device is completed.

[0077] Because the cleaning roller, brush cavity, and brush cover have already been cleaned when the cleaning roller reverses direction, and then the cleaning roller rotates forward again for cleaning, the first flow rate of the cleaning liquid provided by the spraying device is less than the second flow rate, resulting in greater energy savings. The cleaning roller rotates away from the brush cavity, and because the brush cover covers the cleaning roller and its suspended end extends downward parallel to the tangent of the cleaning roller, the liquid flow can enter the gap between the cleaning roller and the floor scraper more quickly into the dirt storage chamber. Therefore, most of the liquid flow moves along the direction of the cleaning roller's rotation in the liquid flow buffer chamber, and is thrown out tangentially by the cleaning roller under its drive. Guided by the brush cover, the liquid flow flows from the liquid flow... The liquid flows out of the buffer chamber and enters the waste storage chamber through the gap between the cleaning roller and the floor scraper below the cleaning roller. A small portion of the liquid is scraped off by the scraper and enters the waste storage chamber directly through the variable flow channel and the flow restriction channel. As the suction motor starts at the same time, the waste liquid or waste in the waste storage chamber enters the suction pipe from the suction port under the action of the suction motor and is sent into the waste collection bucket. Thus, the bristles on the cleaning roller are cleaned. Since the liquid flow in the buffer chamber is constantly flowing dynamically, the cleaning roller is further deeply cleaned, and the roller brush chamber is also dynamically cleaned again. After cleaning, the waste or waste liquid is promptly and quickly cleaned from the waste storage chamber.

[0078] The self-cleaning method of this invention incorporates a dirt-removal step during the reverse cleaning process of the cleaning roller, ensuring that dirt and sludge are removed simultaneously with the cleaning. Furthermore, a forward cleaning step following the reverse cleaning step allows the surface cleaning device to thoroughly clean the brush cavity, brush cover, and cleaning roller, and then re-clean the dirtiest part of the cleaning roller. During this re-cleaning, the liquid spraying is rapid, effectively further rinsing the brush cavity and brush cover, and performing a deeper cleaning of the cleaning roller, thus ensuring the cleanliness of the cleaning components. This automatic... The cleaning methods have resulted in different cleaning modes. A deep automatic cleaning function can be set in the surface cleaning machine program to suit the needs of different customers, especially those who require high cleanliness of the cleaning rollers. First, the cleaning roller reverses and uses a large flow rate to clean the liquid flow buffer chamber or the roller brush cover and roller brush cavity as a whole. Then, the cleaning roller rotates forward and uses a small flow rate to perform a second deep cleaning of the cleaning roller and rinse the roller brush cover and roller brush cavity. This automatic cleaning method is more energy-efficient and saves time. It also achieves two different levels of cleaning of the cleaning components, resulting in high cleaning efficiency and better cleaning effect.

[0079] Of course, it is understandable that we can add a sludge extraction stage after the S2-cleaning roller forward rotation cleaning stage, so that the cleaned cleaning components can be further cleaned by the operation of the sludge suction motor to remove moisture from the cleaning roller, roller brush cavity, and roller brush cover, allowing the surface cleaning device to dry quickly. Alternatively, we can add a cleaning roller drying step after the S2-cleaning roller forward rotation cleaning stage to facilitate the drying of the cleaning roller and prevent it from causing odors due to moisture. Such solutions, which do not depart from the concept of this invention, are all within the protection scope of this invention, and will not be listed in detail here.

[0080] The technical solutions of this application have been described in conjunction with the preceding embodiments. However, it will be readily understood by those skilled in the art that the scope of protection of this application is not limited to these specific embodiments. Without departing from the technical principles of this application, those skilled in the art can disassemble and combine the technical solutions in the above embodiments, and can also make equivalent changes or substitutions to the relevant technical features. Any changes, equivalent substitutions, improvements, etc., made within the technical concept and / or technical principles of this application will fall within the scope of protection of this application.

Claims

1. A self-cleaning method for a surface cleaning device, the surface cleaning device comprising a floor brush with a roller brush cavity and a cleaning seat, the cleaning seat having a cleaning groove corresponding to a cleaning roller in the roller brush cavity, the roller brush cavity having a spray nozzle and a scraper for squeezing and rubbing the cleaning roller, the cleaning roller and the scraper dividing the roller brush cavity into a liquid flow buffer cavity above the scraper and a dirt buffer cavity below the scraper, the dirt buffer cavity being connected to the liquid flow buffer cavity through a flow-limiting channel; when cleaning the surface to be cleaned, the cleaning roller rotates forward, the spray nozzle in the liquid flow buffer cavity supplies water to the cleaning roller, the wetted cleaning roller cleans the surface to be cleaned, and the scraper scrapes off the dirt on the bristles and sucks it away through the suction port, the self-cleaning method comprising: Liquid supply stage: The spray nozzle supplies cleaning liquid to the cleaning roller or cleaning tank; Cleaning roller reversal cleaning stage: The cleaning roller reverses, the scraper squeezes and scrapes the bristles, the liquid flows along the rotation direction of the cleaning roller, and part of the liquid flows dynamically closes the flow restriction channel, so that the liquid flows accumulate in the liquid flow buffer chamber and move to impact, washing the inner wall of the cleaning roller and the roller brush chamber.

2. The self-cleaning method of the surface cleaning device according to claim 1, characterized in that, The self-cleaning method further includes: Cleaning roller forward rotation cleaning stage: The cleaning roller rotates forward, the scraper squeezes and scrapes the brush bristles, and the dirt and / or liquid scraped off by the scraper are sucked away by the suction motor in the dirt storage chamber.

3. The self-cleaning method of the surface cleaning device according to claim 2, characterized in that, In the self-cleaning method, the forward rotation cleaning stage of the cleaning roller is set before and / or after the reverse rotation cleaning stage of the cleaning roller.

4. The self-cleaning method of the surface cleaning device according to claim 1, characterized in that, During or after the roller brush reverse cleaning phase, the suction motor operates to draw out dirt and / or liquid from the dirt storage chamber through the suction port.

5. The self-cleaning method of the surface cleaning device according to claim 2, characterized in that, When the cleaning roller rotates forward, the spray nozzle provides cleaning fluid at a first flow rate; when the cleaning roller rotates in reverse, the spray nozzle provides cleaning fluid at a second flow rate, wherein the second flow rate is not less than the first flow rate.

6. The self-cleaning method of the surface cleaning device according to claim 1, characterized in that, The flow-limiting channel includes a first channel, which is formed between the two sides of the scraper and the left and right side walls of the roller brush cavity.

7. The self-cleaning method of the surface cleaning device according to claim 1, characterized in that, The flow-limiting channel includes a second channel, which is formed between the two sides of the cleaning roller and the left and right side walls of the roller brush cavity.

8. The self-cleaning method of the surface cleaning device according to claim 1, characterized in that, The width of the flow-limiting channel is between 0.4 mm and 2 mm.

9. The self-cleaning method of the surface cleaning device according to claim 1, characterized in that, The floor brush also includes a detachable roller cover, on which a second scraper formed of rubber is provided, the second scraper abutting against the cleaning roller.

10. The self-cleaning method of the surface cleaning device according to claim 9, characterized in that, The spray nozzle is located on the roller brush cover.

Images