CN113796789B - Cleaning base for a surface cleaning apparatus - Google Patents

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 in the above surface cleaning apparatus is often wetted with dirty liquid during use, and this dirty liquid, if not cleaned in time, can affect the continued application of cleaning liquid to the surface to be cleaned by the cleaning roller and can also affect 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 No. CN206434268U discloses a surface cleaning apparatus, in which a rear wiper dry to a brush roller is provided at a rear side of the brush roller to clean a dirty liquid from the brush roller. WO2017059600A1 discloses a floor cleaner in which a sump is attached to the surface of a cleaning cylinder to clean the dirt on the 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 problems, it is an object of the present invention to provide a cleaning base for a surface cleaning apparatus of an efficiency improving 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.

According to the cleaning base, the scraping roller device provided with the double scraping parts has the advantages that dirty liquid and solid garbage on the cleaning roller can be better removed, and the cleaning base 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 the cleaning solution supply tank and the 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 tank 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 view of a dirty liquid recovery unit of a surface cleaning apparatus according to an 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.

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 asurface cleaning apparatus 10 according to one embodiment of the present invention.Surface cleaning apparatus 10 includes abody 11 and acleaning base 12. Thesurface cleaning apparatus 10 of this example is an upright cleaning apparatus, and the machine can be held upright after use.

Surface cleaning apparatus 10 thecleaning 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 themachine body 11 is pivotally mounted to thecleaning base 12, and themachine body 11 is rotatable relative to thecleaning 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 upright models, and may be a recumbent, portable, etc. type of apparatus.

A cleaning liquid supply unit and a dirty liquid recovery unit are disposed on thesurface cleaning apparatus 10. And a cleaning liquid supply unit for storing externally supplied cleaning liquid, the cleaning liquid supply unit including at least a cleaningliquid 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 dirtyliquid 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 pushessurface 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, ahandle 13 is mounted on the top of thebody 11 for a user to hold. Thehandle 13 includes anarcuate grip 14. An operator may holdsurface cleaning apparatus 10 with one hand usingarcuate handle 14 and thereby urgecleaning base 12 ofsurface 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, thebody 11 further includes ahousing 15, and thehousing 15 is a skeleton portion of thebody 11 and mainly functions to receive or carry the rest of the components on thebody 11. Such as a carrying suction device, a handle, a cleaning fluid supply tank, a dirty fluid recovery tank, etc. In this example, thesuction device 2 is fixedly provided in the middle of thecasing 15, and the cleaningliquid supply tank 3 and the foulliquid recovery tank 4 are detachably supported in the upper and lower portions of thecasing 15, respectively.

Thesuction 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. Thesuction device 2 of the present example comprises a suction electric machine constituted by a motor/wind wheel assembly arranged in thecasing 15. The suction motor is capable of providing a suction force extending to the cleaning base. Thesuction device 2 is in fluid communication with the dirtyliquid storage tank 4 through an upper suction passage 21 (see fig. 12). The dirty liquid recovering unit is provided with anupper suction passage 21, and a lower suction passage 22 (see fig. 12) passing through themachine case 15 from the dirtyliquid storage box 4 to a transfer chamber 190 (see fig. 12) of thecleaning base 12, that is, thesuction device 2, thesuction passage 21, the dirtyliquid recovering box 4, thelower suction passage 22 and thetransfer chamber 190 of thecleaning base 12 are communicated in sequence.

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 cleaningliquid 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 cleaningliquid supply tank 3 of this example is detachably mounted to thecabinet 15. The user can replenish the cleaningliquid supply tank 3 with cleaning liquid at any time as required.

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

Themain body 11 includes the above components, and arechargeable battery pack 5 is mounted on thehousing 15. In this embodiment, thebattery pack 5 is mounted on the lower rear side of thehousing 15, i.e., on the rear side of the foulsolution recovery tank 4. Thebattery pack 5 can power all components of thesurface cleaning apparatus 10, such as thesuction 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, acleaning base 12 according to an embodiment of the present disclosure is shown and described. Thecleaning base 12 includes a housing 16, the housing 16 having afront side wall 161, arear side wall 162, left andright side walls 163, 164, atop wall 165, and abottom 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 cleaningroller 18, thesoil 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 thefront side wall 161 to thebottom 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 thebody 11 by the rotary joint 8. The rotary joint 8 includes anupper rotary portion 81 and a lowerrotary portion 82, and theupper rotary portion 81 and the lowerrotary portion 82 enable thebody 11 to be rotatable between an upright rest position and a rearwardly tilted use position.

A part of thelower 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 thecleaning base 12 up into the dirtyliquid recovery tank 4 via thelower suction passage 22. The cleaning liquid can be fed from the cleaningliquid supply tank 3 down to thecleaning base 12 via the cleaning liquid outlet line. The power supply circuit is able to deliver power from thebattery pack 5 located in the upper part down to the power consuming components of thecleaning base 12.

As shown in fig. 4 and 5, thefront side wall 161 and the front portion of the top 165 form aremovable cover 167. A cleaningroller 18 is provided at the front of thecleaning base 12 and is accommodated in theroller chamber 17 at the front of the inner space. The cleaningroller 18 is rotatably supported by left andright side walls 163, 164 of the housing 16, and the cleaningroller 18 is rotatable relative to thehousing 22 about a rotational axis X in the direction R. In this embodiment, theroller chamber 17 communicates with theopening 110. As shown in fig. 1-2, the front portion as well as the lower side portion of the cleaningroller 18 is located at theopening 110.

In this example, the outside of thescrub 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 component, and the driving device 7 is installed in themotor chamber 113 at the rear of the internal space. The cleaningroller 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, thecleaning base 12 includes thewiper roller device 6. The scrapingroller device 6 is installed on the inner wall surface of theupper cover 167 of the shell 16 and is positioned at the upper position of theroller chamber 17, and the scrapingroller device 6 is positioned at the upper side of thesewage box 19. Thesqueegee device 6 is configured to contact a portion of the cleaningroller 18. Thesqueegee assembly 6 is capable of removing excess soil liquid and at least a portion of the solid waste from thescrub roller 18 that is being wetted with soil liquid and adhered to the solid waste. Excess soil and solid waste removed from thescrub roller 18 by thesqueegee assembly 6 can then ultimately be drawn into thesoil recovery tank 4 via thelower suction path 22.

The scrapingroller device 6 according to an embodiment of the present disclosure is shown and described with reference to fig. 6 and 7. The wipingroller device 6 comprises afirst wiping part 61 and asecond wiping part 62, thesecond wiping part 62 being located downstream of the first wipingpart 61 with respect to the direction of rotation R of the cleaningroller 18. Thefirst scraping members 61 and thesecond scraping members 61 are substantially parallel, with aspace 63 between thefirst scraping members 61 and thesecond scraping members 62.

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

Thesecond scraping member 62 includes a scraping bar 621, the scraping bar 621 being configured to contact a portion of the cleaningroller 18 when the cleaningroller 18 rotates, the scrapingbar 18 continuously extending in a direction parallel to the rotational axis X of the cleaningroller 18.

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

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

Referring to fig. 8, it can be understood that when excessive solid waste is deposited on the cleaningroller 18 wetted with the dirty liquid, if a scraping member similar to thesecond scraping member 62 is directly used, the existence of the solid waste may cause the surface of the cleaningroller 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 cleaningroller 18 are scraped in advance by thefirst scraping members 61, so that when the cleaningroller 18 rotates to the subsequentsecond scraping members 62, thesecond scraping members 62 can scrape residual dirty liquid from the cleaningroller 18 more easily. Moreover, thefirst 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 cleaningroller 18 when scraping solid garbage, which is more beneficial to the later scraping operation of thesecond 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 scrapingroller device 6 through thespacer 63, thegap 612 on thefirst scraping member 61; in this example, the dirty liquid and the solid waste discharged from the scrapingroller device 6 flow toward thedirty liquid box 19 on the lower side.

Referring to FIG. 4, a dirtyliquid cartridge 19 is shown and described according to an embodiment of the present disclosure. Adirty liquid box 19 is accommodated in theaccommodating chamber 112 in the middle of the inner space and between theroller chamber 17 and the motor chamber, and thedirty liquid box 19 is arranged to receive dirty liquid and solid garbage transferred from the cleaningroller 18 and the scrapingroller device 6 and thesuction device 2.

Thewaste liquid box 19 of the embodiment of fig. 9 and 10 has a square structure with an open top, and comprises abottom wall 191 and a peripheral side wall composed of afront side wall 192, a rear side wall 193, aleft side wall 194 and a right side wall 195, wherein thebottom wall 191 and the peripheral side wall form atransfer chamber 190 capable of temporarily storing waste liquid and dirt. In this example, the volume of thetransfer chamber 190 is much smaller than the volume of the wasteliquid storage box 4; preferably, the volume of the contaminatedliquid storage tank 4 is 3 times or more the volume of thetransfer chamber 190.

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

Referring to fig. 4 and 10, the positional relationship of thedirty liquid tank 19 and the cleaningroller 18 according to the disclosed embodiment of the present invention is shown and described. Wherein thefront side wall 192 of thewaste liquid box 19 abuts against the cleaningroller 18. Thetransfer chamber 190 has aninput port 197 for the solid-liquid mixture to enter thetransfer chamber 190, and theinput port 197 is disposed on thefront side wall 192 and disposed adjacent to the cleaningroller 18.

Thetransfer chamber 190 in this example is partially below the axis of rotation X of thescrub roller 18 and the mouth of theinput port 197 is also partially below the axis of rotation X. Thefront side wall 192 has aguide ramp 1921 adjacent thescrub roller 18, anupper end 19211 of theguide ramp 1921 extending to aninput opening 197 and alower end 19212 adjacent thelower end 181 of thescrub roller 18.

In this example, the lower end of the guidinginclined plane 192 is a flexible portion made of a flexible material, and the lower end 1922 of the guidinginclined plane 192 at least partially abuts against the surface to be cleaned during the movement of thecleaning base 12 on the surface to be cleaned. This makes it possible to form astable feed opening 1101 between the mouth defined by thelower end 19212 of the "guide slope 192, thelower end 181 of the cleaningroller 18, the lower end of theleft side wall 163 and the lower end of theright side wall 164 and the surface to be cleaned. Thisfeed opening 1101 is advantageous on the one hand for pushing the dirty liquid and solid waste on the surface to be cleaned to thefeed opening 1101 by thelower end 19212 of theguide ramp 192, and on the other hand for always forming a "dynamic seal" between thefeed 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 wipingroller device 6 is positioned above theinput port 197, and thesecond wiping member 62 is positioned above the first wipingmember 61, with the lower portion of the first wipingmember 61 being adjacent to theinput port 197 of thewaste liquid box 19. In this example, the dirty liquid or solid garbage scraped by thefirst scraping member 61 and thesecond scraping member 62 enters thetransfer chamber 190 through theinput 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 cleaningliquid supply tank 3, a firstliquid pump 44, a secondliquid pump 45, acontrol unit 46 for controlling the operation of the firstliquid pump 44 and the secondliquid pump 45, a firstcleaning liquid distributor 42 formed by a plurality of first outlet holes 421, and a secondcleaning liquid distributor 43 formed by a pair of outlet holes 198 (see fig. 9) located at the lower part of thewaste liquid box 19 and arranged opposite to each other. The flow path controldevice 41 that supplies the cleaning liquid in the cleaningliquid supply tank 3 to the firstcleaning liquid distributor 42 and the secondcleaning liquid distributor 43 can be constituted by the firstliquid pump 44, the secondliquid pump 45, and thecontrol unit 46. The flow path controldevice 41 may supply the cleaning liquid in the cleaningliquid supply tank 3 to only the firstcleaning liquid distributor 42, to the secondcleaning liquid distributor 43, or to both the firstcleaning liquid distributor 42 and the secondcleaning liquid distributor 43.

In this example, the firstcleaning liquid dispenser 42 is used to apply clean cleaning liquid to the cleaningroller 18, which in turn is applied to the floor surface to be cleaned by therotating cleaning roller 18. The secondcleaning liquid distributor 43 can wash the inner wall surface of thedirty liquid box 19 with clean cleaning liquid, and this washing function can effectively remove solid dirt adhering to the inner wall surface of thedirty liquid box 19.

As shown in fig. 9, a pair of outlet holes 198 in this example are provided in the lower portions of the left andright side walls 194 and 195 of thewaste tank 19. Theoutlet 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 firstliquid pump 44 is arranged in thecasing 15 of themachine body 11, while the secondliquid pump 45 is arranged in the casing 16 of the cleaningfoot 12, thecontrol 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 controldevice 41 of the cleaning liquid supply unit can supply different flow rates of the cleaning liquid to the firstcleaning liquid distributor 42 and the secondcleaning liquid distributor 43 as required, in addition to supplying the cleaning liquid to the firstcleaning liquid distributor 42 and the secondcleaning liquid distributor 43 as required. In this example, in order to achieve as little residual soiling liquid as possible and as large a flow rate as possible for flushing the inner wall surface of the soilingliquid box 19 during floor cleaning, the flow path controldevice 41 is configured to provide a greater liquid flow rate when the cleaning liquid in the cleaningliquid supply tank 3 is supplied to the secondcleaning liquid distributor 43 than when the cleaning liquid in the cleaningliquid supply tank 3 is supplied to the firstcleaning liquid distributor 42. In order to meet the requirements of different flow rates, thecontrol unit 46 controls the secondliquid pump 45 to operate at a larger flow rate than the firstliquid 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 cleaningroller 18, the firstcleaning liquid distributor 42 is located downstream of the scrapingroller device 6, and the scrapingroller device 3 is located downstream of theinput opening 197 and upstream of the firstcleaning liquid distributor 42.

As the cleaningroller 18 rotates about the direction R, the firstcleaning liquid dispenser 42 continuously applies the cleaning liquid to the cleaningroller 18, and the cleaningroller 18 loaded with the cleaning liquid performs wet scrubbing of thesurface 60 to be cleaned during contact with thesurface 60 to be cleaned. During the scrubbing of the cleaningroller 18 against thesurface 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 cleaningroller 60, and a part of which is carried upward away from thesurface 60 to be cleaned by the centrifugal force generated when the cleaningroller 18 rotates and the suction force of thesuction device 2 acting on thefeed opening 1101.

At the same time, some solid wastes which are not dissolved in the cleaning liquid will adhere to the cleaningroller 18, and some solid wastes will be carried upward away from the surface to be cleaned 60 by the centrifugal force generated when the cleaningroller 18 rotates and the suction force applied to thefeeding port 1101 by thesuction device 2. Dirty liquid and solid waste not loaded onto thescrub roller 18 will then be fed directly from theinput port 197 into thetransfer chamber 190 in thedirty liquid box 19. While the dirty liquid absorbed by the cleaningroller 60 and the solid garbage adhered to the cleaningroller 60 will continue to move downstream after passing through theinput port 197, when moving to the scrapingroller device 6, thefirst scraping member 61 and thesecond scraping member 62 will sequentially rub against the cleaningroller 18, so that the excessive dirty liquid absorbed by the cleaningroller 60 and the solid garbage adhered to the cleaningroller 60 are removed from the cleaningroller 18, and under the effect of gravity and the suction force of thesuction device 2, the part of scraped dirty liquid and solid garbage will flow back down to theinput port 197 and enter thetransfer chamber 190 in thedirty liquid box 19. In other embodiments, the excess soil removed from the scrub roller can also simply flow 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 thetransfer chamber 190 will flow to thesuction opening 196 and be transferred by thesuction device 2 through thelower suction passage 22 to the dirtyliquid recovery tank 4 in real time. The dirty liquid and solid waste will be retained in the dirtyliquid recovery tank 4 and clean air will flow from theupper suction channel 21 to thesuction 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"scrub roller 18, which has been cleaned of excess dirt and solid waste by thescrub roller assembly 6, will continue to rotate about the X-axis and the firstcleaning liquid distributor 42 will continue to deliver clean cleaning liquid to thescrub roller 18 until all of the cleaning of thesurface 60 to be cleaned is completed.

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 (10)

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 having an outer surface covered with bristles, drive means for driving the cleaning roller in rotation, and 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; said second scraping means being located downstream of said first scraping means with respect to the direction of rotation of at least one cleaning roller; wherein said first scraping member is better at removing solid debris adhered to said cleaning roller than said second scraping member, and said second scraping member is better at removing liquid wetted onto said cleaning roller than said first scraping member, said first scraping member including a plurality of tooth-like projections configured to at least partially protrude into bristles of said cleaning roller when said cleaning roller is rotated, and a gap between two adjacent ones of said projections; the second scraping part is positioned above the first scraping part and is provided with a spacing area in front of the first scraping part and the second scraping part, and the excessive dirty liquid and/or small-particle solid garbage scraped from the cleaning roller by the second scraping part flows to the outside of the scraping roller device after sequentially passing through the spacing area and the gap.

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

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

4. The cleaning base of claim 3, wherein the first scraper member is a plastic material and the second scraper member is a metal material.

5. 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.

6. 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.

7. The cleaning base of claim 6, wherein the housing includes a detachable upper cover, and the scraping roller device is disposed on an inner wall surface of the upper cover.

8. The cleaning base of claim 6, further comprising a dirty liquid tank positioned within the housing, the dirty liquid tank being positioned behind and adjacent to the scrub roller, the squeegee assembly being positioned at least partially directly above the dirty liquid tank.

9. The cleaning base of claim 8, wherein the dirty liquid tank has an inlet for dirty liquid and/or solid waste into the dirty liquid tank, the inlet being disposed toward the cleaning roller, and a lower portion of the first scraping member being adjacent the inlet.

10. 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.

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