CN113796789A

CN113796789A - Cleaning base for a surface cleaning apparatus

Info

Publication number: CN113796789A
Application number: CN202010536003.2A
Authority: CN
Inventors: 卞庄
Original assignee: Suzhou Hengding Technology Consulting Co ltd
Current assignee: Suzhou EUP Electric Co Ltd
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2021-12-17
Anticipated expiration: 2040-06-12
Also published as: CN113796789B

Abstract

The invention discloses a cleaning base for a surface cleaning device, which is suitable for moving on a surface to be cleaned, the cleaning base comprises a cleaning roller, a driving device for driving the cleaning roller to rotate, a scraping roller device for removing redundant dirty liquid and solid garbage from the rotating and wetted cleaning roller, the scraping roller device comprises a first scraping part and a second scraping part, and the first scraping part and the second scraping part are configured to contact with a part of the cleaning roller when the cleaning roller rotates; the first scraping member is preferred to remove solid waste adhering to the cleaning roller, while the second scraping member is preferred to remove excess liquid wetting the cleaning roller. The cleaning base has the advantages that the scraping roller device provided with the double scraping parts can better remove dirty liquid and solid garbage on the cleaning roller, and the cleaning base also has better surface cleaning capability.

Description

Cleaning base for a surface cleaning apparatus

Technical Field

The invention belongs to the technical field of household cleaning equipment, and particularly relates to a cleaning base for surface cleaning equipment.

Background

Surface cleaning apparatuses, such as floor washers, typically utilize a cleaning base to clean and soil a surface to be cleaned. In the cleaning base of such an apparatus, a cleaning roller having a fluff layer wetted with a liquid is usually disposed, and when the cleaning roller is operated, the cleaning liquid is applied to the surface to be cleaned by the rotating cleaning roller, and during the rotation of the cleaning roller, the cleaning roller can simultaneously pick up the dirty liquid on the surface to be cleaned together with the suction force of the suction device, and then send the dirty liquid into the dirty liquid recovery tank of the dirty liquid recovery unit.

It is well known that the cleaning roller of the surface cleaning apparatus is often wetted with dirty liquid during use, and this portion of dirty liquid, if not cleaned in time, can interfere with the continued application of cleaning liquid to the surface to be cleaned by the cleaning roller and can interfere with the ability of the cleaning roller to pick up dirty liquid from the surface to be cleaned.

In order to solve the problem of cleaning up the dirty liquid of the cleaning roller, the prior art provides a scraping roller device capable of scraping off the dirty liquid on a moisture absorption fluff layer of the cleaning roller. Chinese patent publication No. CN206434268U discloses a surface cleaning apparatus in which a back blade dried with a brush roller is provided at the back side of the brush roller to clean the brush roller of the contaminated liquid. WO2017059600a1 discloses a floor cleaner in which a water tank is fastened to the surface of a cleaning cylinder to clean the dirt on the floor cleaner.

Although the above-described wiper roller device has been advanced sufficiently, its ability to remove dirt from the cleaning roller is still slightly insufficient. Therefore, there is a need in the market to provide a wiping roller device with further improved wiping capability to be disposed on a cleaning base of a surface cleaning apparatus to improve cleaning efficiency.

Disclosure of Invention

In order to solve the above technical problem, it is an object of the present invention to provide a cleaning base for a surface cleaning apparatus of an efficiency-improved type.

In order to achieve the purpose of the invention, the invention adopts the following technical scheme: a cleaning foot for a surface cleaning apparatus, the cleaning foot being adapted to be moved over a surface to be cleaned, the cleaning foot comprising a cleaning roller, drive means for driving the cleaning roller in rotation, scraper roller means for removing excess soiled liquid and solid debris from the rotating and wetted cleaning roller, characterised in that the scraper roller means comprises first and second scraper members arranged to each contact a portion of the cleaning roller when the cleaning roller is rotated; wherein the first scraping member is superior in removing solid waste adhering to the cleaning roller to the second scraping member, and the second scraping member is superior in removing liquid wetted on the cleaning roller to the first scraping member.

In an advantageous embodiment, the second scraping means are located downstream of the first scraping means with respect to the direction of rotation of the at least one cleaning roller.

In an advantageous embodiment, said first scraping member comprises a plurality of tooth-like projections and a gap between two adjacent projections, said projections being configured to at least partially protrude into the interior of said cleaning roller when said cleaning roller is rotated.

It may be particularly advantageous that said first scraping member and said second scraping member are preceded by a spacer, and that excess dirt liquid and/or small particle solid waste scraped off said cleaning roller by said second scraping member passes through said spacer, said gap in sequence, and flows outside said scraping roller arrangement.

In an advantageous embodiment, said second scraping member comprises a scraping bar, said scraping bar being arranged to contact a portion of said cleaning roller when said cleaning roller is rotated, said scraping bar extending continuously in a direction parallel to the rotational axis of said cleaning roller.

In an advantageous embodiment, the second scraping member is located above the first scraping member.

In an advantageous embodiment, the hardness of the second scraper member is greater than the hardness of the first scraper member.

In a particularly advantageous manner, said first scraper member may be made of plastic material and said second scraper member may be made of metal.

In an advantageous embodiment, the friction between the second scraper members and the cleaning roller is greater than the friction between the first scraper members and the cleaning roller.

In an advantageous embodiment, the cleaning foot comprises a housing defining a roller chamber inside, the cleaning roller being mounted in the roller chamber.

In a particularly advantageous manner, the housing comprises a detachable upper cover, the scraper device being arranged on an inner wall surface of the upper cover.

In another particularly advantageous embodiment, the cleaning base further comprises a dirt tray located within the housing, the dirt tray being located behind and adjacent to the cleaning roller, and the squeegee assembly being located at least partially directly above the dirt tray.

In a particularly advantageous manner, the dirty liquid tank has an inlet opening for dirty liquid and/or solid waste into the interior, which inlet opening is arranged toward the cleaning roller, and the lower part of the first scraper element is adjacent to the inlet opening.

In an advantageous embodiment, the cleaning base further comprises at least one liquid distributor for applying a cleaning liquid to the cleaning roller; the liquid distributor is located downstream of the wiping roller arrangement with respect to the direction of rotation of the at least one cleaning roller.

The cleaning base has the advantages that the scraping roller device provided with the double scraping parts can better remove dirty liquid and solid garbage on the cleaning roller, and the cleaning base also has better surface cleaning capability.

Drawings

FIG. 1 is a perspective view of a surface cleaning apparatus according to one embodiment of the present invention, wherein the body is in an upright storage position;

FIG. 2 is a second perspective view of the surface cleaning apparatus according to one embodiment of the present invention, with the body in a rearwardly tilted use position;

FIG. 3 is an exploded view of a surface cleaning apparatus according to one embodiment of the present invention, wherein a cleaning solution supply tank and a dirty solution recovery tank on the body are separated from the housing;

FIG. 4 is a cross-sectional view of a cleaning base of the surface cleaning apparatus of FIG. 2;

FIG. 5 is a second exploded view of the surface cleaning apparatus according to one embodiment of the present invention, wherein the cleaning solution supply tank and the dirty solution recovery tank are separated from the housing of the body, and the upper cover and the dirty solution box are separated from the housing of the cleaning base;

FIG. 6 is a perspective view of the waste bin of FIG. 5 from a bottom perspective;

FIG. 7 is an enlarged view of FIG. 6 at A;

FIG. 8 is a cross-sectional view through the upper cover taken along the direction B-B in FIG. 5;

figure 9 is a perspective view of a waste fluid cassette according to one embodiment of the present invention,

FIG. 10 is a cross-sectional view of the waste bin of FIG. 9 taken along the line C-C;

FIG. 11 is a schematic view of a cleaning liquid supply unit of a surface cleaning apparatus according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of a dirty liquid recovery unit of a surface cleaning apparatus according to one embodiment of the present invention.

Detailed Description

For the purpose of illustrating the technical content, the constructional features, the achieved objects and the effects of the invention in detail, reference will be made to the following detailed description of the embodiments in conjunction with the accompanying drawings.

Fig. 1, 2 are schematic diagrams illustrating a surface cleaning apparatus 10 according to one embodiment of the present invention. Surface cleaning apparatus 10 includes a housing 11 and a cleaning base 12. The surface cleaning apparatus 10 of this example is an upright cleaning apparatus, and the machine can be held upright after use.

Surface cleaning apparatus 10 the cleaning base 12 is supported on and movable along the surface to be cleaned during cleaning of the surface to be cleaned. The lower portion of the machine body 11 is pivotally mounted to the cleaning base 12, and the machine body 11 is rotatable relative to the cleaning base 12 between an upright rest position (as in fig. 1) and a rearwardly inclined use position (as in fig. 2).

In other embodiments, surface cleaning apparatus 10 is not limited to being an upright type, and may be a horizontal, portable, etc. type of apparatus.

A cleaning liquid supply unit and a dirty liquid recovery unit are disposed on the surface cleaning apparatus 10. And a cleaning liquid supply unit for storing externally supplied cleaning liquid, the cleaning liquid supply unit at least including a cleaning liquid supply tank 3 for storing the cleaning liquid. A dirty liquid recovery unit for removing dirty liquid into which used cleaning liquid is converted from a surface to be cleaned and removing solid waste on the surface to be cleaned, and storing the dirty liquid and the solid waste for a certain time; the dirty liquid recovery unit includes at least a dirty liquid recovery tank 4 for storing dirty liquid and solid waste for a certain period of time.

For purposes of description in relation to the figures, the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", and derivatives thereof, are used in a defined positional relationship with respect to the direction in which a user pushes surface cleaning apparatus 10 across a surface to be cleaned (i.e., a back-to-front pushing direction). As used herein, the term "rear side" refers to a location that is rearward of at least one other component, but does not necessarily mean rearward of all other components. It is to be understood, however, that the invention may assume various alternative orientations, except where expressly specified to the contrary.

Referring to fig. 1, a handle 13 is mounted on the top of the body 11 for a user to hold. The handle 13 includes an arcuate grip 14. An operator may hold surface cleaning apparatus 10 with one hand using arcuate handle 14 and thereby urge cleaning base 12 of surface cleaning apparatus 10 back and forth across the surface to be cleaned in the condition of figure 2. In other embodiments, the handle may further comprise a user interface comprising one or more operating elements, such as, but not limited to, buttons, triggers, switches, etc., by which the surface cleaning apparatus can control the operation of all controlled components in the surface cleaning apparatus, such as being switched on or off for cleaning operations, delivery regulation of cleaning liquid, power regulation of the suction device, etc. In other embodiments, the user interface may be located elsewhere on the surface cleaning apparatus, such as on a top wall or side wall of the body below the handle.

Referring to fig. 3, the body 11 further includes a housing 15, and the housing 15 is a skeleton portion of the body 11 and mainly functions to receive or carry the rest of the components on the body 11. Such as carrying suction devices, handles, cleaning fluid supply tanks, waste fluid recovery tanks, etc. In this example, the suction device 2 is fixedly provided in the middle of the casing 15, and the cleaning liquid supply tank 3 and the foul liquid recovery tank 4 are detachably supported in the upper and lower portions of the casing 15, respectively.

The suction device 2 is a suction force forming member belonging to the dirty liquid recovery unit, and is used for generating a force for flowing the dirty liquid. The suction device 2 of the present example comprises a suction electric machine constituted by a motor/wind wheel assembly arranged in the casing 15. The suction motor is capable of providing a suction force extending to the cleaning base. The suction device 2 is in fluid communication with the dirty liquid storage tank 4 through an upper suction passage 21 (see fig. 12). Besides the upper suction passage 21, the dirty liquid recovery unit further has a lower suction passage 22 (see fig. 12) passing through the housing 15 and leading to a transfer chamber 190 (see fig. 12) of the cleaning base 12 from the dirty liquid storage box 4, that is, the suction device 2, the suction passage 21, the dirty liquid recovery box 4, the lower suction passage 22, and the transfer chamber 190 of the cleaning base 12 are sequentially communicated.

In other embodiments, the suction device may also comprise a pump, under the action of which the transfer of the dirty liquid or solid-liquid mixture in the transfer chamber mentioned below into the dirty liquid recovery tank is effected, and according to this arrangement the pump will be placed between the transfer chamber and the dirty liquid recovery tank.

The cleaning liquid supply tank 3 comprises at least one chamber for holding cleaning liquid. In other embodiments, the cleaning liquid supply tank may further comprise a plurality of chambers. The cleaning liquid may be water or a detergent mixed solution mixed with a detergent. The cleaning liquid supply tank 3 of this example is detachably mounted to the cabinet 15. The user can replenish the cleaning liquid supply tank 3 with cleaning liquid at any time as required.

The dirty liquid recovery tank 4 is mounted on the lower front side of the cabinet 15, and the dirty liquid recovery tank 4 is detachably mounted to the front of the cabinet 15. This structure can be convenient for the user at any time as required to the dirty liquid collection box 4 evacuation processing. In other embodiments, the dirty liquid recovery tank may be installed at other positions, even at any position on the housing 15.

The body 11 includes the above-mentioned components, and a rechargeable battery pack 5 is mounted on the housing 15. In this embodiment, the battery pack 5 is mounted on the lower rear side of the housing 15, i.e., on the rear side of the waste liquid recovery tank 4. The battery pack 5 can power all components of the surface cleaning apparatus 10, such as the suction device 2, that need to consume electrical energy when in operation. In other embodiments, a power plug capable of being electrically connected with the outside may be disposed on the machine body, so as to supply power to the power consuming components of the machine by the external power supply.

Referring to FIG. 3, a cleaning base 12 according to an embodiment of the present disclosure is shown and described. The cleaning base 12 includes a housing 16, the housing 16 having a front side wall 161, a rear side wall 162, left and

right side walls

163, 164, a top wall 165, and a bottom wall 166, i.e., the housing 16 is generally box-shaped.

Referring to fig. 4, the inner wall of the housing 16 defines an inner space in which the cleaning roller 18, the soil box 19, and the driving device 7 are at least partially received. The front of the housing 16 has an opening 110 (shown in fig. 1 and 2) extending from the front side wall 161 to the bottom wall 166. In other embodiments, the opening may be located only at the front of the bottom wall, and the front side wall of the housing is a complete wall extending from the top wall to the bottom wall.

As shown in fig. 3 and 5, the housing 16 is pivotally held at a lower portion of the body 11 by the rotary joint 8. The rotary joint 8 includes an upper rotary portion 81 and a lower rotary portion 82, and the upper rotary portion 81 and the lower rotary portion 82 enable the body 11 to be rotatable between an upright rest position and a rearwardly tilted use position.

A part of the lower suction channel 22, a part of the cleaning liquid outlet line and a part of the power supply circuit extend through the rotary joint 8. Dirty liquid and solid waste can be transported from the cleaning base 12 up into the dirty liquid recovery tank 4 via the lower suction passage 22. The cleaning liquid can be fed from the cleaning liquid supply tank 3 down to the cleaning base 12 via the cleaning liquid outlet line. The power supply circuit is able to deliver power from the battery pack 5 located in the upper part down to the power consuming components of the cleaning base 12.

As shown in fig. 4 and 5, the front side wall 161 and the front portion of the top 165 form a removable cover 167. A cleaning roller 18 is provided at the front of the cleaning base 12 and is accommodated in the roller chamber 17 at the front of the inner space. The cleaning roller 18 is rotatably supported by left and

right side walls

163, 164 of the housing 16, and the cleaning roller 18 is rotatable relative to the housing 22 about a rotational axis X in the direction R. In this embodiment, the roller chamber 17 communicates with the opening 110. As shown in fig. 1-2, the front portion and the lower portion of the scrub roller 18 are located at the opening 110.

In this example, the outside of the scrub roller 18 is covered with cleaning elements, which may have bristles, fabric or other cleaning elements, configured to be wetted by a cleaning liquid, such as water, detergent composition, etc.

As shown in fig. 4, in this example, the driving device 7 is mainly composed of a motor member, and the driving device 7 is installed in the motor chamber 113 at the rear of the internal space. The cleaning roller 18 is operatively coupled to the drive means 7 and driven in rotation by the drive means 7. In other embodiments, the motor chamber may not be separately provided, and the driving device may be built in the cleaning roller.

Referring to fig. 5, 6 and 7, the cleaning base 12 includes the wiper roller device 6. The scraping roller device 6 is installed on the inner wall surface of the upper cover 167 of the shell 16 and is positioned at the upper position of the roller chamber 17, and the scraping roller device 6 is simultaneously positioned at the upper side of the sewage box 19. The squeegee device 6 is configured to contact a portion of the cleaning roller 18. The squeegee assembly 6 is capable of removing excess soil liquid and at least a portion of the solid waste from the scrub roller 18 that is being wetted with soil liquid and adhered to the solid waste. Excess soil and solid waste removed from the scrub roller 18 by the squeegee assembly 6 can then ultimately be drawn into the soil recovery tank 4 via the lower suction path 22.

The scraping roller device 6 according to an embodiment of the present disclosure is shown and described with reference to fig. 6 and 7. The wiping roller device 6 comprises a first wiping part 61 and a second wiping part 62, the second wiping part 62 being located downstream of the first wiping part 61 with respect to the direction of rotation R of the cleaning roller 18. The first scraping members 61 and the second scraping members 61 are substantially parallel, with a space 63 between the first scraping members 61 and the second scraping members 62.

The first scraping member 61 includes a plurality of tooth-like projections 611, the plurality of projections 611 are arranged in a direction parallel to the rotational axis X of the cleaning roller 18, and a gap 612 is provided between adjacent two projections 611. The plurality of protrusions 611 are arranged to partially penetrate into the cleaning roller 18. The rotation of the cleaning roller 18 enables the plurality of protrusions 611 of the first scraping member 61 to remove solid waste such as hair, floe, etc., which are adhered to the outer circumferential surface of the cleaning roller 18, and at the same time, to scrape off a part of the contaminated liquid on the cleaning roller 18. It should be understood that the shape of protrusions 611 is not limited to those shapes shown and/or described in this application, unless specifically so required.

The second scraping member 62 includes a scraping bar 621, the scraping bar 621 being configured to contact a portion of the cleaning roller 18 when the cleaning roller 18 rotates, the scraping bar 18 continuously extending in a direction parallel to the rotational axis X of the cleaning roller 18.

In this example, the second scraping member 62 has a hardness greater than that of the first scraping member 61, for example, the first scraping member 61 is made of plastic, and the second scraping member 62 is made of metal.

By means of the structure of the first scraper members 61 and the second scraper members 62 it is achieved that the first scraper members 61 are better at removing solid waste from the cleaning roller 18 than the second scraper members 62, while the second scraper members 62 are better at removing excess liquid from the cleaning roller 18 than the first scraper members 61; and the frictional force between the second scraper members 62 and the cleaning roller 18 is greater than the frictional force between the first scraper members 61 and the cleaning roller 18.

Referring to fig. 8, it can be understood that when excessive solid waste is deposited on the cleaning roller 18 wetted with the dirty liquid, if a scraping member similar to the second scraping member 62 is directly used, the existence of the solid waste may cause the surface of the cleaning roller 18 to slip, and the efficiency of scraping the dirty liquid is reduced; according to the scheme, solid waste and a small part of dirty liquid adhered to the cleaning roller 18 are scraped by the first scraping part 61 in advance, so that when the cleaning roller 18 rotates to the subsequent second scraping part 62, the second scraping part 62 can scrape the residual dirty liquid from the cleaning roller 18 more easily. Moreover, the first scraping part 61 is a multi-tooth-shaped protrusion structure, and is a part similar to a "comb" or "rake" structure, which can break up and fluffy the cleaning elements (such as bristles) on the surface of the cleaning roller 18 when scraping solid garbage, which is more beneficial to the later scraping operation of the second scraping part 62. While the dirty liquid scraped by the second scraping member 62 (which may contain small particles of solid waste) can flow to the outside of the scraping roller device 6 through the spacer 63, the gap 612 on the first scraping member 61; in this example, the dirty liquid and the solid waste discharged from the scraping roller device 6 flow toward the dirty liquid box 19 on the lower side.

Referring to FIG. 4, a dirty liquid cartridge 19 is shown and described according to an embodiment of the present disclosure. A dirty liquid box 19 is accommodated in the accommodation chamber 112 in the middle of the inner space between the roller chamber 17 and the motor chamber, the dirty liquid box 19 being arranged to receive dirty liquid and solid waste transferred from the cleaning roller 18 and the wiping roller device 6 and the suction device 2.

The dirty liquid box 19 of the embodiment shown in fig. 9 and 10 has a square structure with an open top, and includes a bottom wall 191 and a peripheral side wall formed by a front side wall 192, a rear side wall 193, a left side wall 194 and a right side wall 195, wherein the bottom wall 191 and the peripheral side wall enclose a transfer chamber 190 capable of temporarily storing dirty liquid and dirt. In this example, the volume of the transfer chamber 190 is much smaller than the volume of the waste liquid storage box 4; preferably, the volume of the contaminated liquid storage tank 4 is 3 times or more the volume of the transfer chamber 190.

A suction opening 196 is provided at the intersection of the lower portion of the rear side wall 195 and the rear portion of the bottom wall 191, the suction opening 196 being in fluid communication with the dirty liquid recovery tank 4 via a lower suction passage 22 extending through the rotary joint 8 (see fig. 12). Under the suction action of the suction device 2, the dirty liquid or the solid-liquid mixture entering the transfer chamber 190 can be sent to the dirty liquid recovery tank 4. In this example, in order to facilitate the dirty liquid in the transfer chamber 190 to flow to the suction port 196, the inner wall surface of the bottom wall 191 is provided with a sloped surface 1911 inclined rearward, and the sloped surface 1911 is the lowest position near the suction port 196.

Referring to fig. 4 and 10, the positional relationship of the dirty liquid tank 19 and the cleaning roller 18 according to the disclosed embodiment of the present invention is shown and described. Wherein the front side wall 192 of the waste liquid box 19 abuts against the cleaning roller 18. The transfer chamber 190 has an input port 197 for the solid-liquid mixture to enter the transfer chamber 190, and the input port 197 is disposed on the front side wall 192 and disposed adjacent to the cleaning roller 18.

The transfer chamber 190 in this example is partially below the axis of rotation X of the scrub roller 18 and the mouth of the input port 197 is also partially below the axis of rotation X. The front side wall 192 has a guide ramp 1921 adjacent the scrub roller 18, an upper end 19211 of the guide ramp 1921 extending to an input opening 197 and a lower end 19212 adjacent the lower end 181 of the scrub roller 18.

In this example, the lower end of the guiding inclined plane 192 is a flexible portion made of a flexible material, and the lower end 1922 of the guiding inclined plane 192 at least partially abuts against the surface to be cleaned during the movement of the cleaning base 12 on the surface to be cleaned. This makes it possible to form a stable feed opening 1101 between the mouth defined by the lower end 19212 of the "guide slope 192, the lower end 181 of the cleaning roller 18, the lower end of the left side wall 163 and the lower end of the right side wall 164 and the surface to be cleaned. This feed opening 1101 is advantageous on the one hand for pushing the dirty liquid and solid waste on the surface to be cleaned to the feed opening 1101 by the lower end 19212 of the guide ramp 192, and on the other hand for always forming a "dynamic seal" between the feed opening 1101 and the surface to be cleaned, which both advantages ultimately lead to an increase in the dirt pick-up capacity of the surface cleaning apparatus.

As further shown in fig. 4 and 8, the wiping roller device 6 is positioned above the input port 197, and the second wiping member 62 is positioned above the first wiping member 61, with the lower portion of the first wiping member 61 being adjacent to the input port 197 of the waste liquid box 19. In this example, the dirty liquid or solid garbage scraped by the first scraping member 61 and the second scraping member 62 enters the transfer chamber 190 through the input port 197.

Referring to fig. 11, a schematic diagram of a cleaning liquid supply unit according to an embodiment of the present disclosure is shown and described. As can be seen from this figure, the cleaning liquid supply unit comprises, in addition to the cleaning liquid supply tank 3, a first liquid pump 44, a second liquid pump 45, a control unit 46 for controlling the operation of the first liquid pump 44 and the second liquid pump 45, a first cleaning liquid distributor 42 formed by a plurality of first liquid outlet holes 421, and a second cleaning liquid distributor 43 formed by a pair of outlet holes 198 (see fig. 9) disposed opposite to each other and located below the waste liquid box 19. The flow path control device 41 that supplies the cleaning liquid in the cleaning liquid supply tank 3 to the first cleaning liquid distributor 42 and the second cleaning liquid distributor 43 can be constituted by the first liquid pump 44, the second liquid pump 45, and the control unit 46. The flow path control device 41 may supply the cleaning liquid in the cleaning liquid supply tank 3 to only the first cleaning liquid distributor 42, to the second cleaning liquid distributor 43, or to both the first cleaning liquid distributor 42 and the second cleaning liquid distributor 43.

In this case, the first cleaning liquid dispenser 42 serves to apply clean cleaning liquid to the cleaning roller 18, and thus to the floor surface to be cleaned, by means of the rotating cleaning roller 18. The second cleaning liquid distributor 43 can wash the inner wall surface of the dirty liquid box 19 with clean cleaning liquid, and this washing function can effectively remove solid dirt adhering to the inner wall surface of the dirty liquid box 19.

As shown in fig. 9, a pair of outlet holes 198 in this example are located at the lower portions of the left side wall 194 and the right side wall 195 of the waste tank 19. The outlet opening 198 is configured to direct a spray of cleaning liquid downwardly from horizontal at an angle of 10 deg. -80 deg. so as to be able to spray the cleaning liquid into the inner lower region of the dirt box. The first liquid pump 44 is arranged in the casing 15 of the machine body 11, while the second liquid pump 45 is arranged in the casing 16 of the cleaning foot 12, the control unit 46 being integrated on a control board (not shown) of the machine. In other embodiments, the first cleaning liquid dispenser may alternatively deliver the cleaning liquid directly to the surface to be cleaned.

In this example, the flow path control device 41 of the cleaning liquid supply unit can supply different flow rates of the cleaning liquid to the first cleaning liquid distributor 42 and the second cleaning liquid distributor 43 as required, in addition to supplying the cleaning liquid to the first cleaning liquid distributor 42 and the second cleaning liquid distributor 43 as required. In this example, in order to achieve as little residual soiling solution as possible and as large a flow rate as possible for flushing the inner wall surface of the soiling solution box 19 during floor cleaning, the flow path control device 41 is configured to provide a greater flow rate of liquid when supplying the cleaning liquid in the cleaning liquid supply tank 3 to the second cleaning liquid distributor 43 than when supplying the cleaning liquid in the cleaning liquid supply tank 3 to the first cleaning liquid distributor 42. In order to meet the requirements of different flow rates, the control unit 46 controls the second liquid pump 45 to operate at a larger flow rate than the first liquid pump 44 in this example.

In other embodiments, a single fluid pump may be used in combination with a three-way valve instead of the two fluid pumps, wherein the three-way valve allows two flow paths to be switched freely, and the flow rate of the single fluid pump is controlled to allow two fluid pumps to operate at different flow rates.

Referring to fig. 12, a schematic diagram of a dirty liquid recovery unit according to an embodiment of the disclosure is shown and described. In terms of the direction of rotation R of the cleaning roller 18, the first cleaning liquid distributor 42 is located downstream of the scraping roller device 6, and the scraping roller device 3 is located downstream of the input opening 197 and upstream of the first cleaning liquid distributor 42.

As the cleaning roller 18 rotates in the direction R, the first cleaning liquid dispenser 42 continuously applies the cleaning liquid to the cleaning roller 18, and the cleaning roller 18 loaded with the cleaning liquid performs wet scrubbing of the surface 60 to be cleaned during contact with the surface 60 to be cleaned. During the scrubbing of the cleaning roller 18 against the surface 60 to be cleaned, the used cleaning liquid is contaminated into dirty liquid, a part of which is absorbed by the cleaning elements on the outer surface of the cleaning roller 60, and a part of which is carried upward away from the surface 60 to be cleaned by the centrifugal force generated when the cleaning roller 18 rotates and the suction force of the suction device 2 acting on the feed opening 1101.

At the same time, some solid wastes which are not dissolved in the cleaning liquid will adhere to the cleaning roller 18, and some solid wastes will be carried upward away from the surface to be cleaned 60 by the centrifugal force generated when the cleaning roller 18 rotates and the suction force applied to the feeding port 1101 by the suction device 2. Dirty liquid and solid waste not loaded onto the scrub roller 18 will then be fed directly from the input port 197 into the transfer chamber 190 in the dirty liquid box 19. While the dirty liquid absorbed by the cleaning roller 60 and the solid garbage adhered to the cleaning roller 60 will continue to move downstream after passing through the input port 197, when moving to the scraping roller device 6, the first scraping member 61 and the second scraping member 62 will sequentially rub against the cleaning roller 18, so that the excessive dirty liquid absorbed by the cleaning roller 60 and the solid garbage adhered to the cleaning roller 60 are removed from the cleaning roller 18, and under the influence of gravity and the suction force of the suction device 2, the part of the scraped dirty liquid and solid garbage will flow back down to the input port 197 and enter the transfer chamber 190 in the dirty liquid box 19. In other embodiments, the excess soil removed from the scrub roller may simply run by gravity into a transfer chamber in a soil box located below it.

At least a portion of the dirty liquid and solid waste entering the transfer chamber 190 will flow to the suction opening 196 and be transferred by the suction device 2 through the lower suction passage 22 to the dirty liquid recovery tank 4 in real time. The dirty liquid and solid waste will be retained in the dirty liquid recovery tank 4 and clean air will flow from the upper suction channel 21 to the suction device 2 and eventually escape to the outside.

Therefore, the dirty liquid recovery unit completes the recovery work of dirty liquid and solid garbage in one stage. In the next stage, the "clean" cleaning roller 18, which has been freed of excess dirt and solid waste by the squeegee assembly 6, will continue to rotate about the X-axis and the first cleaning liquid dispenser 42 will continue to deliver clean cleaning liquid to the cleaning roller 18 until all of the surfaces 60 to be cleaned have been cleaned.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A cleaning foot for a surface cleaning apparatus, the cleaning foot being adapted to be moved over a surface to be cleaned, the cleaning foot comprising a cleaning roller, drive means for driving the cleaning roller in rotation, scraper roller means for removing excess soiled liquid and solid debris from the rotating and wetted cleaning roller, characterised in that the scraper roller means comprises first and second scraper members arranged to each contact a portion of the cleaning roller when the cleaning roller is rotated; wherein the first scraping member is superior in removing solid waste adhering to the cleaning roller to the second scraping member, and the second scraping member is superior in removing liquid wetted on the cleaning roller to the first scraping member.

2. The cleaning base of claim 1, wherein the second scraping member is located downstream of the first scraping member with respect to a direction of rotation of the at least one cleaning roller.

3. The cleaning base of claim 1, wherein the first scraping member comprises a plurality of tooth-like projections and a gap between two adjacent projections, the projections being configured to at least partially protrude into the interior of the cleaning roller when the cleaning roller is rotated.

4. The cleaning base of claim 3, wherein the first scraping member and the second scraping member are preceded by a spacer, and excess dirty liquid and/or small particle solid waste scraped off the sweeping roller by the second scraping member flows to the outside of the scraping roller device after passing through the spacer, the gap in sequence.

5. The cleaning base of claim 1, wherein the second scraping member comprises a scraping strip configured to contact a portion of the cleaning roller when the cleaning roller is rotated, the scraping strip extending continuously in a direction parallel to the rotational axis of the cleaning roller.

6. The cleaning base of claim 1, wherein the second wiper member is positioned above the first wiper member.

7. The cleaning base of claim 1, wherein the hardness of the second scraper member is greater than the hardness of the first scraper member.

8. The cleaning base of claim 7, wherein the first scraper member is a plastic material and the second scraper member is a metal material.

9. The cleaning base of claim 1, wherein a friction force between the second scraping member and the cleaning roller is greater than a friction force between the first scraping member and the cleaning roller.

10. The cleaning base of claim 1, wherein the cleaning base comprises a housing defining a roller chamber therein, the cleaning roller being mounted within the roller chamber.

11. The cleaning base of claim 10, wherein the housing includes a detachable upper cover, and the scraping roller device is disposed on an inner wall surface of the upper cover.

12. The cleaning base of claim 10, further comprising a dirt cup positioned within the housing, the dirt cup positioned behind and adjacent to the scrub roller, the squeegee assembly positioned at least partially directly above the dirt cup.

13. The cleaning base of claim 12, wherein the dirty liquid tank has an inlet for dirty liquid and/or solid waste to enter the tank, the inlet being disposed toward the cleaning roller, and a lower portion of the first scraping member being adjacent the inlet.

14. The cleaning base of claim 1, further comprising at least one liquid dispenser for applying a cleaning liquid to the cleaning roller; the liquid distributor is located downstream of the wiping roller arrangement with respect to the direction of rotation of the at least one cleaning roller.