Patent Publication Number: US-2023157504-A1

Title: Cleaning device

Description:
The present application claims priority benefit of China application No. 202010422172.3, filed with the China National Intellectual Property Administration on May 19, 2020 and entitled “CLEANING DEVICE”. The entirety of each of the above mentioned patent applications is hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND 
     Technical Field 
     The present invention relates to the cleaning field, and in particular, to a cleaning device. 
     Description of Related Art 
     Cleaning devices are necessary tools in people&#39;s daily life. There are many types of cleaning devices, mainly including mops, brooms, vacuum cleaners, sweeping robots, etc. 
     Among purchase options, people usually choose a required cleaning device based on a cleaning requirement and price, but the consumers are all faced with a common problem. Mops, brooms, and vacuum cleaners cannot replace each other, while sweeping robots are too expensive to be used as equivalents of mops or brooms. 
     To make improvements against the foregoing technical problem, some cleaning device products that integrate sweeping and mopping functions have been put forward on the market, and a main working principle thereof is to directly use a motor-driven roller brush and dispose a waste collection region correspondingly, in an attempt to bring up waste by a rolling action of the roller brush on the ground, and transfer the waste to the waste collection region, thereby cleaning the ground. However, this method is faced with many technical problems when applied to ground cleaning with various cleaning environments, mainly including the following. 1. Because of a material limitation of the roller brush, it is difficult to ensure that dust or sewage on the ground is directionally transferred to the waste collection region. 2. It is difficult to collect sewage absorbed by the roller brush into the waste collection region, leading to gradual deterioration of the cleaning effect of the roller brush and water accumulation on the ground. 3. Because dry waste and wet waste collected in the waste collection region are in a mixed and closed state, the waste collection region is prone to stink after long-term use, resulting in poor use experience; and in addition, because a collection inlet of the waste collection region needs to have a function of directional collection corresponding to the roller brush, when a user lifts the whole cleaning device, the waste in the waste collection region overflows. 
     In view of this, the applicant hopes to make targeted improvements against the foregoing technical problems, so that a cleaning device can be more easily accepted by mass consumers and bring good cleaning experience. 
     SUMMARY 
     An objective of the present invention is to provide a cleaning device, which significantly avoids or reduces waste omission and effectively improves a cleaning effect of a composite sweeping and mopping function through a specific design combination of a roller brush and a cleaning guiding path. 
     To achieve the foregoing objective, the present invention uses the following technical solutions: 
     A cleaning device includes a roller brush mounted on a housing and capable of reaching rolling contact with a ground, where the housing is integrally or separately provided with a waste collection region, the waste collection region is provided with a collection inlet corresponding to the roller brush, and waste brought up by the rolling contact is collected into the waste collection region under a rotating action of the roller brush; and the housing is provided with one or more scraping guides connected to the collection inlet, and each scraping guide reaches flexible pressure contact with the roller brush or the ground, and is configured to scrape off residual waste absorbed by the roller brush or residual waste on the ground and transfer the residual waste to the waste collection region, to reduce or avoid waste omission. 
     In a preferred technical solution, the roller brush correspondingly matches the housing to form a roller brush scraping guide connected to the collection inlet, and the roller brush scraping guide is configured to scrape off the residual waste absorbed by the roller brush and transfer the residual waste to the waste collection region; and the roller brush scraping guide includes a roller brush scraper located on the housing and reaching flexible pressure contact with the roller brush, the roller brush scraper is provided with a liquid storage space, and the liquid storage space is connected to the waste collection region through a drainage path. 
     In a preferred technical solution, the roller brush scraper is separately mounted and connected to the housing, and a distance between the roller brush scraper and the roller brush is capable of being adjusted through a lifting motion, to adjust a flexible pressure contact effect between the roller brush scraper and the roller brush and meet cleaning requirements under different cleaning conditions; where the distance between the roller brush scraper and the roller brush is increased under a sweeping condition to be beneficial to a ground sweeping effect of the roller brush, and the distance between the roller brush scraper and the roller brush is reduced under a mopping condition to be beneficial to a ground mopping effect. 
     In a preferred technical solution, the liquid storage space includes a liquid storage and drainage groove connected to the drainage path, the liquid storage and drainage groove is provided with several scraping holes, and through the flexible pressure contact between the roller brush scraper and the roller brush, each of the scraping holes scrapes off the residual waste absorbed by the roller brush and transfers the residual waste to the liquid storage and drainage groove; or the liquid storage space includes a liquid storage cavity plate with a liquid storage cavity, the liquid storage cavity plate is provided with several scraping holes, and through the flexible pressure contact between the roller brush scraper and the roller brush, each of the scraping holes scrapes off the residual waste absorbed by the roller brush and transfers the residual waste to the water storage cavity plate. 
     In a preferred technical solution, the roller brush correspondingly matches the housing to form a ground scraping guide connected to the collection inlet, and the ground scraping guide is configured to scrape off the residual waste on the ground and transfer the residual waste to the waste collection region through a rotary motion of the roller brush; and the ground scraping guide includes a ground scraping bar and a guide surface separately located on the housing, the ground scraping bar reaches flexible pressure contact with the ground, and the guide surface is connected to the collection inlet. 
     In a preferred technical solution, the ground scraping bar extends obliquely in a direction of the roller brush, and the ground scraping bar is mounted on the guide surface in a relatively swinging mode to adjust resistance on flexible pressure contact between the ground scraping bar and the ground. 
     In a preferred technical solution, a water collection stand is formed among the ground scraping bar and two ends of the guide surface, two ends of the ground scraping bar each are provided with a protruding portion to form a recessed backflow collection region located in the middle, and waste in the recessed backflow collection region is transferred to the waste collection region through the rotary motion of the roller brush. 
     In a preferred technical solution, the housing is provided with a roller brush scraping guide and a ground scraping guide that are connected to the collection inlet and are located respectively above and below the collection inlet. 
     The roller brush scraping guide reaches flexible pressure contact with the roller brush, and is configured to scrape off the residual waste absorbed by the roller brush or the residual waste on the ground and transfer the residual waste to the waste collection region; and the ground scraping guide reaches pressure contact with the ground, and is configured to scrape off the residual waste on the ground and transfer the residual waste to the waste collection region. 
     In a rotating state of the roller brush, a directional closed-loop cleaning path is formed among the ground, the roller brush, and the waste collection region through linked scraping by the roller brush scraping guide and the ground scraping guide, to reduce or avoid waste omission. 
     In a preferred technical solution, a receiving and flow guiding groove connected to the scraping guide is provided at a bottom portion of the housing, and is configured to receive liquid drops dropped when the roller brush rotates, and the liquid in the receiving and flow guiding groove is transferred to the waste collection region by the scraping guide. 
     In a preferred technical solution, the roller brush includes a driving roller driven by a drive and relatively rotatably mounted on the housing, and a periphery of the driving roller is wrapped with a flexible roller brush for flexible contact with the ground, where materials of the flexible roller brush include at least two types of cleaning fibers with unequal water absorbencies, the cleaning fibers with a high water absorbency facilitate removal of liquid waste on the ground, and the cleaning fibers with a low water absorbency facilitate removal of solid waste on the ground. 
     The water absorbency herein refers to a ratio of a volume or mass of water absorbable by cleaning fibers per unit mass or volume to a volume or mass of the cleaning fibers, which is common knowledge in the art. 
     The present invention has the following advantages and beneficial effects. In the present invention, rolling contact between a roller brush and a ground is first used, so that waste on the ground is brought up by the roller brush in a rotary motion state through negative pressure adsorption, and is transferred to a waste collection region corresponding to the roller brush under a centrifugal force effect generated when the roller brush rotates. However, a directional waste collection function under the centrifugal force effect is relatively poor, which leads to more waste omission. Therefore, in the present invention, a scraping guide connected to a collection inlet is innovatively proposed, and the scraping guide reaches flexible pressure contact with the roller brush or the ground to scrape off residual waste absorbed by the roller brush or residual waste residual waste on the ground and transfer the residual waste to the waste collection region. Such implementation can significantly reduce or avoid waste omission, effectively improve a cleaning effect of a composite sweeping and mopping function, is finally easily and widely accepted by mass consumers, and brings good cleaning experience. In the present invention, a roller brush scraping guide and a ground scraping guide respectively arranged on upper and lower portions are further preferably proposed. In the rotating state of the roller brush, a directional closed-loop cleaning path is formed among the ground, the roller brush, and the waste collection region through linked scraping by the roller brush scraping guide and the ground scraping guide. Such implementation can reduce or avoid waste omission to the greatest extent. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic diagram of an appearance structure of a cleaning device  1  in Embodiment 1 of the present invention; 
         FIG.  2    is a schematic diagram of a structure obtained after rotating  FIG.  1    by a certain angle; 
         FIG.  3    is a sectional view of a roller brush part in Embodiment 1 of the present invention; 
         FIG.  4    is an exploded view of  FIG.  1   ; 
         FIG.  5    is a schematic diagram of a mounting structure of an upper mounting housing  11   a  in Embodiment 1 of the present invention; 
         FIG.  6    is an enlarged view of a position A in  FIG.  5   ; 
         FIG.  7    is a schematic diagram of a structure obtained after rotating  FIG.  5    by a certain angle; 
         FIG.  8    is a sectional view of a waste collection box  3  in Embodiment 1 of the present invention; 
         FIG.  9    is a schematic diagram of a mounting structure of a liquid sprayer  6  in Embodiment 1 of the present invention; 
         FIG.  10    is a sectional view of a liquid sprayer  6  in Embodiment 1 of the present invention; 
         FIG.  11    is a schematic diagram of a mounting structure of a ground nozzle  64  in Embodiment 1 of the present invention; 
         FIG.  12    is a schematic diagram of a structure of a lower mounting housing  11   b  in Embodiment 1 of the present invention; 
         FIG.  13    is an enlarged view of a position B in  FIG.  12   ; 
         FIG.  14    is a schematic diagram of a local sectional structure of a cleaning device  1 ′ in Embodiment 2 of the present invention; and 
         FIG.  15    is an enlarged view of a position C in  FIG.  14   . 
     
    
    
     Reference numerals: cleaning device  1 , mounting housing  11 , upper mounting housing  11   a , lower mounting housing  11   b , torsion head  12 , handle  13 , convex rib  15   a , limiting mounting groove  15   b , cleaning mop  16 , main roller assembly  17   a , auxiliary roller assembly  17   b , receiving and flow guiding groove  18 , roller brush  2 , driving roller  2   a , flexible roller brush  2   b , waste collection box  3 , collection inlet  31 , liquid waste collection region  32 , liquid waste collection box side plate  32   a , liquid anti-overflow limiting portion  32   b , outwardly extending protruding stand  32   c , solid waste collection region  33 , solid waste collection box side plate  33   a , solid anti-overflow limiting portion  33   b , filter partition  34 , groove  34   a , filter hole  34   b , cover plate  35 , roller brush scraping guide  4 , ground scraping guide  5 , roller brush scraper  41 , liquid storage and drainage groove  42 , scraping hole  43 , drainage groove  44 , ground scraping bar  51 , guide surface  52 , water collection stand  53 , protruding portion  54 , recessed backflow collection region  55 , liquid sprayer  6 , liquid storage box  61 , valve body  62 , liquid spray pipeline  63 , ground liquid spray pipe branch  63   a , supporting and shaping liquid spray pipe section  63   b , ground nozzle  64 , spraying port  66 , electric pump  67 , drive  7 , motor  71 , pulley  72 , battery  73 , cleaning device  1 ′, roller brush cover plate  11   c , cover plate drive  8 , limiting protruding stand  81 , limiting teeth  81   a , limiting sliding groove  82 , limiting groove  82   a , and spring  83 . 
     DESCRIPTION OF THE EMBODIMENTS 
     Specific implementations of the present invention are further described below with reference to the accompanying drawings and embodiments. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention. 
     Embodiment 1. Referring to  FIG.  1    to  FIG.  13   , a cleaning device  1  includes a roller brush  2  mounted on a housing and capable of reaching rolling contact with the ground, and the housing includes a mounting housing  11  for mounting the roller brush  2 . The mounting housing  11  is integrally assembled by using an upper mounting housing  11   a  and a lower mounting housing  11   b . The lower mounting housing  11   b  moves on a ground by using a main roller assembly  17   a  and an auxiliary roller assembly  17   b , thereby avoiding or reducing frictional contact between the roller brush  2  and the ground. The mounting housing  11  is integrally mounted and connected to a handle  13  by using a torsion head  12 . The mounting housing  11  is integrally or separately provided with a waste collection region. In this embodiment, a waste collection box  3  is used in the waste collection region and can be directly clamped on the mounting housing  11  to facilitate actual operation and use such as disassembly, waste cleanup, and waste box cleaning by a user. The waste collection box  3  is provided with a collection inlet  31  corresponding to the roller brush  2 , and waste brought up by rolling contact is collected into the waste collection box  3  under a rotating action of the roller brush  2 . 
     When the present application is implemented, the waste collection region is not limited to being located in the mounting housing  11 . In another implementation, a person skilled in the art may dispose the waste collection region in another area of the housing based on actual mounting requirements. For example, the handle  13  may also be used as a part of the housing, and the handle  13  is provided with the waste collection region. These all fall within the implementation scope of the present application. 
     Preferably, in this embodiment, the roller brush  2  includes a driving roller  2   a  driven by a drive and relatively rotatably mounted on the mounting housing  11 , and a periphery of the driving roller  2   a  is wrapped with a flexible roller brush  2   b  for flexible contact with the ground. Specifically, in this embodiment, the driving roller  2   a  is driven by a drive  7  composed of a motor  71  and a pulley  72 , and two ends of the driving roller  2   a  are detachably mounted at an output end of the pulley and the mounting housing  11 , respectively. A specific mounting structure may be implemented by using conventional technical means in the art. 
     Materials of the flexible roller brush  2   b  include at least two types of cleaning fibers with unequal water absorbencies, the cleaning fibers with a high water absorbency are mainly used to remove liquid waste on the ground, and the cleaning fibers with a low water absorbency are mainly used to remove solid waste on the ground. Specifically, during implementation and application, the cleaning fibers with a high water absorbency may be cotton fibers or fibers with a similar water absorbency, which is usually 1.5-3, more preferably 1.5-2. The cleaning fibers with a low water absorbency may be polyester fibers, with a water absorbency usually not greater than 1.5. To further achieve a better cleaning effect, in this embodiment, the cleaning fibers have a fluff length ranging from 15 mm to 30 mm. The cleaning fibers with a low water absorbency have a fluff length greater than that of the cleaning fibers with a low water absorbency, and a length difference may be set to 1-2 mm. 
     To meet requirements for cleaning of the ground with waste in different states, in this embodiment, the cleaning fibers with a high water absorbency and the cleaning fibers with a low water absorbency are distributed alternately and spirally on the driving roller  2   a . A ratio of a distribution area of the cleaning fibers with a high water absorbency to a distribution area of the cleaning fibers with a low water absorbency on the flexible roller brush  2   b  ranges from 1:(0.5-2.5), and a specific area ratio may be selected based on cleaning needs in specific applications. These are not taken as limitations to this embodiment. When in use, water in fluff of each cleaning fiber on the roller brush  2  can be fully thrown out by a centrifugal force, and it is not easy to leave residual water. After cleaning and use, the fluff of the cleaning fibers on the roller brush  2  can also be dried quickly, thereby avoiding bacterial breeding caused by overwetting. 
     The mounting housing  11  is provided with one or more scraping guides connected to the collection inlet  31 , and each scraping guide reaches flexible pressure contact with the roller brush  2  or the ground, and is configured to scrape off residual waste absorbed by the roller brush  2  or residual waste on the ground and transfer the residual waste to the waste collection box  3 , to reduce or avoid waste omission. 
     Preferably, in this embodiment, the mounting housing  11  is provided with a roller brush scraping guide  4  and a ground scraping guide  5  that are connected to the collection inlet  31  and are located above and below the collection inlet  31 , respectively. The roller brush scraping guide  4  reaches flexible pressure contact with the roller brush  2 , and is configured to scrape off the residual waste absorbed by the roller brush  2  or the residual waste on the ground and transfer the residual waste to the waste collection box  3 . The ground scraping guide  5  reaches pressure contact with the ground, and is configured to scrape off the residual waste on the ground and transfer the residual waste to the waste collection box  3 . In a rotating state of the roller brush  2 , a directional closed-loop cleaning path is formed among the ground, the roller brush  2 , and the waste collection box  3  through linked scraping by the roller brush scraping guide  4  and the ground scraping guide  5 , to reduce or avoid waste omission to the greatest extent. 
     Specifically, preferably, in this embodiment, the roller brush  2  correspondingly matches the mounting housing  11  to form a roller brush scraping guide  4  connected to the collection inlet  31 , and the roller brush scraping guide  4  is configured to scrape off the residual waste absorbed by the roller brush  2  and transfer the residual waste to the waste collection box  3 . The roller brush scraping guide  4  includes a roller brush scraper  41  located on the mounting housing  11  and reaching flexible pressure contact with the roller brush  2 , the roller brush scraper  41  is provided with a liquid storage space, and the liquid storage space is connected to the waste collection box  3  through a drainage path. In specific implementation, the roller brush scraper  41  is arc-shaped, and the roller brush scraper  41  may be integrally connected to the mounting housing  11  or may be separately mounted and connected to the mounting housing  11 . No particular limitation is imposed in this embodiment. 
     Preferably, the roller brush scraper  41  come into interference with the cleaning fibers of the roller brush  2 . Specifically, an amount of interference between the roller brush scraper  41  and short fluff of the cleaning fibers is 0.5-2 mm. When the amount of interference is excessively high, the fluff of the cleaning fibers of the roller brush  2  is likely to clump together, and a fluffy state of the cleaning fibers of the roller brush  2  cannot be ensured, resulting in a gap between the cleaning fibers and the ground, and making it impossible to effectively clean out waste on the ground. When the amount of interference is excessively low, an amount of contact between the roller brush scraper  41  and the cleaning fibers of the roller brush  2  is excessively small, leading to a low water scraping effect. 
     The liquid storage space includes a liquid storage and drainage groove  42  connected to the drainage path, the liquid storage and drainage groove  42  is provided with several scraping holes  43 , and through the flexible pressure contact between the roller brush scraper  41  and the roller brush  2 , each of the scraping holes scrapes off the residual waste absorbed by the roller brush  2  and transfers the residual waste to the liquid storage and drainage groove  42 . In another implementation, the liquid storage space may alternatively include a liquid storage cavity plate (not shown in the figure) with a liquid storage cavity, the liquid storage cavity plate is provided with several scraping holes  43 , and through the flexible pressure contact between the roller brush scraper  41  and the roller brush  2 , each of the scraping holes  43  scrapes off the residual waste absorbed by the roller brush  2  and transfers the residual waste to the water storage cavity plate. A structural design of the liquid storage cavity plate can have a better liquid storage effect and avoid water leakage. Certainly, this may lead to liquid waste residue on the liquid storage cavity plate. A person skilled in the art may select a specific implementation solution based on actual requirements. 
     In specific implementation of this embodiment, the scraping holes  43  are provided corresponding to the roller brush  2 . The scraping holes  43  each may have a diameter range of 0.5-2 mm, and are inclined downward, to ensure that water flowing into the scraping holes  43  does not easily back flow. The drainage path includes a drainage groove  44  located in the mounting housing  11 , an inlet of the drainage groove  44  communicates with one or two sides of the liquid storage and drainage groove  42 , and an outlet thereof communicates with the waste collection box  3 . Further, preferably, a plurality of scraper convex ribs are distributed on a surface that is of the roller brush scraper  41  and that faces the roller brush  2 . Such implementation can further improve water scraping efficiency and ensure the fluffy state of the cleaning fibers of the roller brush  2 . A height of the scraper convex ribs may be set to 0.2-1 mm. 
     Specifically, preferably, in this embodiment, the roller brush  2  correspondingly matches the mounting housing  11  to form a ground scraping guide  5  connected to the collection inlet  31 , and the ground scraping guide  5  is configured to scrape off the residual waste on the ground and transfer the residual waste to the waste collection box  3  through a rotary motion of the roller brush  2 . The ground scraping guide  5  includes a ground scraping bar  51  and a guide surface  52  separately located on the mounting housing  11 , the ground scraping bar  51  reaches flexible pressure contact with the ground, and the guide surface  52  is connected to the collection inlet  31 . The ground scraping bar  51  extends obliquely in a direction of the roller brush  2 . Specifically, in implementation, the ground scraping bar  51  may be a rubber scraping bar, with a front end designed in a shape of a wedge obliquely extending in the direction of the roller brush  2 . The ground scraping bar  51  has a Shore A hardness of 40-80, more preferably 45-70. Such implementation can ensure that when the front end of the ground scraper bar  51  reaches contact with the ground, the wedge-shaped part is properly deformed to make the flexible contact between the ground scraping bar and the ground closer, and after the roller brush  2  sweeps the waste on the ground, a sewage film left on the ground can be pushed forward into a mass. Through the rotary motion of the roller brush  2  and guide matching with the guide surface  52 , the sewage is collected into the waste collection box  3  without causing water residue on the ground after the cleaning is completed, to significantly improve a sewage collection rate, thereby achieving an effect of scraping off the waste left on the ground. 
     When the user is pushing the cleaning device forward, if the ground scraping bar  51  cannot swing relative to the guide surface  52 , due to a large stress surface, especially due to tension of a water film formed by the ground sewage, the stress center of the ground scraping bar  51  is located in the front of the cleaning device  1 , and it is relatively difficult for the user to push the cleaning device  1  forward. To overcome relatively high forward resistance, the cleaning device  1  moves forward unobviously up and down, which leads to a poor water scraping effect of the ground scraping bar  51 , and the residual water film is still relatively thick. Therefore, the following is also proposed in this embodiment: the ground scraping bar  51  is mounted on the guide surface  52  in a relatively swinging mode, to adjust resistance on flexible pressure contact between the ground scraping bar  51  and the ground, so that the resistance is smaller. With this structure, when the cleaning device  1  is pushed forward for cleaning, a lower edge position of the ground scraping bar  51  in contact with the ground is stressed to deform backward. When the cleaning device  1  is pulled backward for cleaning, the lower edge position of the ground scraping bar  51  in contact with the ground is stressed to deform forward. The ground scraping bar  51  is still faced with a certain pressure due to a limiting effect of the guide surface  52 . Such implementation facilitates quick and flexible squeezing of the sewage film for cleaning, makes a water scraping surface sufficient, significantly reduces liquid or water residue on the ground, achieves a good water scraping effect, and enables the user to perform cleaning easily and conveniently. It should be noted that the ground scraping bar  51  may be directly mounted on the guide surface  52 , or an indirect mounting relationship may be used (i.e., there is no direct mounting and connection relationship between the ground scraping bar  51  and the guide surface  52 ), as long as it is ensured that the ground scraping bar  51  can swing relative to the guide surface  52 . Such implementation usually can be used to adjust the resistance on the flexible pressure contact between the ground scraping bar  51  and the ground. These fall within the implementation scope of the present application. 
     In this embodiment, a water collection stand  53  is formed between the ground scraping bar  51  and two ends of the guide surface  52 . For the roller brush, during arrangement of the flexible roller brush  2   b , considering requirements on mounting structures at the two ends of the driving roller  2   a , fluff of the cleaning fibers of the flexible roller brush  2   b  cannot fill the two ends, because excessive fluff of the cleaning fibers may cause rotation and winding on two sides of the cleaning device  1 . However, such implementation leads to the fact that water released by the roller brush  2  during a rotary centrifugal process is less susceptible to, at positions on two sides, push by the fluff of the cleaning fibers of the roller brush  2  into the collection inlet  31  of the waste collection box  3 , but back flows from two ends of the water collection stand  53 , resulting in waste omission. Therefore, preferably, in this embodiment, two ends of the ground scraping bar  51  each are provided with a protruding portion  54  to form a recessed backflow collection region  55  located in the middle, and various types of solid or liquid waste in the recessed backflow collection region  55  are thrown (transferred) to the waste collection box  3  through the rotary motion of the roller brush  2 . The guide surface  52  of this embodiment may also be referred to as a centrifugal dirt-removing surface, and is arranged opposite to the roller brush  2 . Because the protruding portions  54  are arranged at the two ends of the ground scraping bar  51 , the recessed backflow collection region  55  with two high sides and a low middle is formed. During operation, sewage at the two ends of the water collection stand  53  is gathered toward the middle through the recessed backflow collection region  55 , and is cleaned by the roller brush  2  again, thereby avoiding forming two sewage marks on the two sides of the cleaning device  1  and improving a cleaning effect. 
     In practical deep application, the applicant found that when the cleaning device is used to clean a wet ground with liquid waste, even if the roller brush  2  squeezes water through the flexible pressure contact with the roller brush scraper  41 , sewage inevitably flows downward and drips, resulting in sewage omission. Therefore, preferably, in this embodiment, the bottom of the lower mounting housing  11   b  is provided with a receiving and flow guiding groove  18  connected to the guide surface  52 , the receiving and flow guiding groove  18  is located below the roller brush  2  and is connected to two sides of the guide surface  52  to form a closed receiving and flow guiding groove structure, which is configured to receive liquid drops dropped when the roller brush  2  rotates (including receiving liquid drops dropped when the roller brush scraping guide  4  reaches flexible pressure contact with the roller brush  2 ). The guide surface  52  of the ground scraping guide  5  throws the sewage in the receiving and flow guiding groove into the waste collection box  3  again. 
     However, because dry waste and wet waste collected in the waste collection box  3  are in a mixed and closed state, the waste collection box  3  is prone to stink after long-term use, resulting in poor use experience. Preferably, in this embodiment, the waste collection box  3  includes a lower liquid waste collection region  32  and an upper solid waste collection region  33  that are separated from each other, where the solid waste collection region  32  is provided with the collection inlet  31  corresponding to the roller brush  2 , and a filter partition  34  is arranged between the solid waste collection region  32  and the liquid waste collection region  33 . The filter partition  34  is provided with one or more rows of grooves  34   a , and several filter holes  34   b  distributed at intervals are provided in the grooves  34   a . In actual use, all waste first enters the solid waste collection region  32  through the collection inlet  31 , while the liquid waste flows into the liquid waste collection region  33  through the filter holes  34   b . Such implementation meets requirements of the user for classified waste dumping, and reduces and avoids stinking caused by long-term mixing of dry waste and wet waste. 
     Preferably, in this embodiment, a solid waste collection box with the collection inlet  31  is used in the solid waste collection region  32 , and a liquid waste collection box is used in the liquid waste collection region  33 . The solid waste collection box and the liquid waste collection box are mounted and connected into a whole. The filter partition  34  is used at the bottom of the solid waste collection box, and a cover plate  35  of the solid waste collection box is a detachable cover plate that can be selectively opened. In practical application, when dumping waste, the user may first take out the solid waste collection box and dump the dry waste collected in the solid waste collection box into a waste bin, and then dump the liquid waste collected in the liquid waste collection box into a pool for discharge. 
     Because the cleaning device  1  is usually provided with a torsion head  12 , the user may lift the whole cleaning device  1  during daily use. Such implementation causes the handle  13  and the mounting housing  11  with the roller brush  2  to be horizontal and perpendicular, so that the collection inlet  31  of the waste collection box  3  is horizontal, and various types of waste in the solid waste collection box and the liquid waste collection box may leak or overflow, resulting in pollution to the ground and the cleaning device body. Therefore, preferably, in this embodiment, the solid waste collection box includes a solid waste collection box side plate  33   a  located on a side of the collection inlet  31 , the solid waste collection box side plate  33   a  is provided with a solid anti-overflow limiting portion  33   b  obliquely extending to the inside of the solid waste collection box, and the solid anti-overflow limiting portion  33   b  is located below the collection inlet  31 . The liquid waste collection box includes a liquid waste collection box side plate  32   a  located on a side of the collection inlet  31 , and the liquid waste collection box side plate  32   a  is hermetically sleeved outside the solid waste collection box side plate  33   a . In addition, the liquid waste collection box side plate  32   a  is provided with a liquid anti-overflow limiting portion  32   b  obliquely extending to the inside of the liquid waste collection box, and the liquid anti-overflow limiting portion  32   b  is located below the filter partition  34 . The solid anti-overflow limiting portion  33   b  and the liquid anti-overflow limiting portion  32   b  may specifically have a shape of a plate rib, and can separately and effectively prevent waste from overflowing from the collection inlet  31 . 
     To ensure mounting and connection strength between the liquid waste collection box and the solid waste collection box and improve mounting convenience, in this embodiment, an end portion of the liquid waste collection box side plate  32   a  is provided with an outwardly extending protruding stand  32   c  located outside the collection inlet  31 , and the outwardly extending protruding stand  32   c  is in guided connection to a lower end of the collection inlet  31 . 
     Preferably, in this embodiment, the bottom of the liquid waste collection box is provided with a mop mounting region, and a cleaning mop  16  that can reach contact with the ground is arranged in the mop mounting region. A structure of a limiting mounting groove  15   b  formed by convex ribs  15   a  is used in the mop mounting region. The cleaning mop  16  is made of fluff fibers, and the convex ribs  15   a  are made of rubber. During use of this product, an extremely thin water film left on the ground after ground cleaning by the roller brush  2  may be wiped out and absorbed by using the cleaning mop  16  in the limiting mounting groove  15   b , so that the cleaned ground can be quickly dried, avoiding a possible risk of falling of the user caused by an excessively slippery ground, and it is convenient for the user to pick, place, and clean the cleaning mop. In actual maintenance, the rubber convex ribs  15   a  around the limiting mounting groove  15   b  may be used as squeezing ribs, and have a shore A hardness of 50-100, so that after dumping wet waste, the user can conveniently press the liquid waste collection box on a wall of a water pool to squeeze out water and keep the cleaning mop dry. The cleaning mop  16  is preferably made of a flannelette material with a water absorbency of 1.1-1.5. Such implementation can ensure absorption of the residual water film on the ground, and can prevent the cleaning mop  16  from absorbing excessive water, which causes drying difficulty and bacterial breeding. 
     This embodiment further proposes a liquid sprayer  6  of the cleaning device  1 , which is mounted on the mounting housing  11  of the cleaning device  1 . The liquid sprayer  6  includes a liquid storage region for storing a cleaning liquid, and a liquid storage box is specifically used in the liquid storage region. The liquid storage box  61  selectively sprays the cleaning liquid onto the ground and/or the roller brush  2  by using an electric pump  67  (or a mechanical pump in another embodiment), and an outlet of the liquid storage box  61  is provided with a valve body  62  that is in driving connection to the mechanical pump or the electric pump. The mechanical pump or the electric pump is connected to at least one nozzle through a liquid spray pipeline  63 , and the cleaning liquid is sprayed on the ground and/or the roller brush  2  through the nozzle. In this embodiment, the liquid storage box  61  is mounted on the handle  13 , specifically in the front of the handle  13 , and the nozzle is mounted on the mounting housing  11 . The liquid spray pipeline  63  runs through the torsion head  12  and then is connected to the nozzle. In this embodiment, the liquid spray pipeline  63  is led from the upper handle  13  to a front end of the lower mounting housing  11 , instead of being directly arranged on the lower mounting housing  11 , thereby facilitating disassembly and assembly of the liquid storage box  61  by the user. Moreover, the liquid spray pipeline  63  is routed and mounted in a closed structure, and therefore is not exposed to the outside or easily collided, facilitating overall aesthetics of the cleaning device  1 . The liquid storage box  61  is arranged in the front of the handle  13 . Such implementation can allow the center of gravity of the handle  13  to move forward and maintain a standing state of the handle  13 , thereby avoiding a risk that the handle-type cleaning device  1  is prone to fall down. 
     In this embodiment, the liquid sprayer  6  includes a ground nozzle  64  for spraying the cleaning liquid to the ground and a roller brush nozzle (not shown in the figure) for spraying the cleaning liquid to the roller brush  2 , and the liquid spray pipeline  63  includes a ground liquid spray pipe branch  63   a  connected to the ground nozzle  64  and a roller brush pipe branch (not shown in the figure) connected to the roller brush nozzle. Through this structural design, the cleaning device  1  of this embodiment can wet the cleaning fibers on the roller brush  2  through the roller brush nozzle when cleaning a ground with heavy-duty waste such as dark soy sauce and tomato sauce, and under actions of a rotating centrifugal force of the roller brush  2  and the roller brush scraper  41 , contaminated cleaning fibers on the roller brush  2  can be continuously cleaned, so that the roller brush  2  is quickly self-cleaned. The ground nozzle  64  is arranged corresponding to the ground, the roller brush nozzle is arranged corresponding to the roller brush  2 , and the ground nozzle  64  and the roller brush nozzle are separately mounted on the mounting housing  11 . The liquid spray pipeline  63  runs through the torsion head and then is connected to the ground nozzle  64  and the roller brush nozzle, that is, the ground nozzle  64  and the roller brush nozzle are connected to corresponding liquid storage boxes  61  respectively through the liquid spray pipeline  63 . Certainly, in another implementation, the ground nozzle  64  or the roller brush nozzle may be provided alone, and may be independently implemented to obtain positive effects. In another implementation, independent liquid spray pipelines and liquid storage boxes may also be selected for the ground nozzle  64  and the roller brush nozzle based on actual needs. 
     Preferably, in this embodiment, the mounting housing  11  located at a front end of the roller brush  2  is provided with a spray port  66  for inserting the ground nozzle  64 , and the ground nozzle  64  sprays the cleaning liquid (usually water) onto the ground, to prevent or reduce the spraying of the cleaning liquid on the mounting housing  11 . In addition, the roller brush nozzle is mounted on the mounting housing  11  and arranged correspondingly to the roller brush  2 , and the roller brush nozzle sprays the cleaning liquid onto the roller brush  2  for self-cleaning of the roller brush  2 . In this embodiment, the ground nozzle  64  is mounted at the front end of the roller brush  2 , is close to the ground, and has a low height. Such implementation facilitates uniform spraying of a water flow, and prevents the sprayed water from splashing to make the ground very wet or prevents spraying on the housing of the cleaning device  1 . The ground nozzle  64  is flat and inclined, which facilitates downward spraying of water in a sector shape, and makes the sprayed water flow more uniform. Specifically, preferably, the ground nozzle  64  is provided in an inclined shape, and an included angle between the ground nozzle  64  and a horizontal plane is not greater than 30°, preferably 5-20°, and most preferably 15°, to ensure a better spray and atomization effect of the water flow, and avoid spraying too far away and wetting indoor appliances. 
     In this embodiment, as described above, the roller brush  2  is relatively rotatably mounted on the mounting housing  11  by using the drive  7  composed of the motor  71  and the pulley  72 , and can reach rolling contact with the ground. The motor  71  specifically uses a battery  73  as a power supply, and the motor  71  and the battery  73  are mounted on two sides of the mounting housing  11 , respectively. The liquid spray pipeline  63  is close to a side, of the mounting housing  11 , on which the battery  73  is mounted. The liquid spray pipeline  63  passes through the side of the battery  73  rather than the side of the motor  71 . Such implementation ensures safety of the cleaning device  1 , and can achieve an effect of cooling the battery  73  to a certain extent, thereby prolonging a service life of the battery  73 . 
     In this embodiment, to facilitate a supporting and shaping effect of the liquid spray pipeline  63  during arrangement, the liquid spray pipeline  63  includes a supporting and shaping liquid spray pipe section  63   b  wound around a periphery of the waste collection box  3 , and the supporting and shaping liquid spray pipe section  63   b  is separately connected to the ground liquid spray pipe branch  63   a  and the roller brush pipe branch. Such implementation can improve and simplify the structural designs of the ground liquid spray pipe branch  63   a  and the roller brush pipe branch, and ensure mounting and supporting strength of each pipe branch. 
     Embodiment 2. In Embodiment 1, when the amount of interference between the roller brush scraper  41  and the cleaning fibers on the roller brush  2  is excessively high under a sweeping condition, the cleaning fibers on the roller brush  2  become flaky after being wetted, leading to a small dust holding capacity of the fluff of the cleaning fibers, which is not beneficial to an effect of cleaning out the waste on the ground. Moreover, when a mopping condition is performed upon completion of the sweeping condition, the amount of interference between the roller brush scraper  41  and the cleaning fibers on the roller brush  2  in Embodiment 1 can be increased. The water on the cleaning fibers can be scraped out to a greater extent by the roller brush scraper  41 , and the residual water film on the ground can be substantially cleaned out by repeating the operation. Such implementation solves the problem that it takes a long time to dry the ground after ground cleaning, and further increases dryness of the cleaning fibers on the roller brush  2  to avoid secondary pollution to the cleaned ground caused by bacteria breeding. Therefore, in Embodiment 2, a cleaning device  1 ′ is proposed, and the technical solutions are the same as those in Embodiment 1 except the following. Further referring to  FIG.  14    and  FIG.  15   , in Embodiment 2, the roller brush scraper  41  is separately mounted and connected to the mounting housing  11 , and a distance between the roller brush scraper  41  and the roller brush  2  can be adjusted through a lifting motion, so that an effect of flexible pressure contact between the roller brush scraper  41  and the roller brush  2  is adjusted to meet cleaning requirements under different cleaning conditions. Increasing the distance between the roller brush scraper  41  and the roller brush  2  under a sweeping condition is beneficial to a ground sweeping effect of the roller brush  2 , and reducing the distance between the roller brush scraper  41  and the roller brush  2  under a mopping condition is beneficial to a ground mopping effect. Embodiment 2 further proposes the following specific structure to implement adjustment of the distance between the roller brush scraper  41  and the roller brush  2 . 
     The mounting housing  11  includes a roller brush cover plate  11   c  mounted in a split mode. The roller brush scraper  41  is arranged on an inner side of the roller brush cover plate  11   c . The roller brush cover plate  11   c  is capable of performing a lifting motion relative to the mounting housing  11 , and the lifting motion adjusts the distance between the roller brush scraper  41  and the roller brush  2 , to adjust the effect of flexible pressure contact between the roller brush scraper  41  and the roller brush  2  and meet cleaning requirements under different cleaning conditions. Specifically, in this embodiment, a cover plate drive  8  is mounted between the roller brush cover plate  11   c  and the mounting housing  11 , and the roller brush cover plate  11   c  is capable of performing a lifting motion relative to the mounting housing  11  by using the cover plate drive  8 , and the lifting motion adjusts a distance between the roller brush cover plate  11   c  and the roller brush  2 . 
     In this embodiment, the cover plate drive  8  is a mechanical drive. The mechanical drive includes a limiting protruding stand  81  fixedly mounted at a lower end of the roller brush cover plate  11   c , and the mounting housing  11  is provided with a limiting sliding groove  82  into which the limiting protruding stand  81  is selectively limited and inserted. The limiting protruding stand  81  is provided with limiting teeth  81   a , the bottom of the limiting sliding groove  82  is provided with a limiting groove  82   a , and a spring  83  is arranged between the limiting teeth  81   a  and the limiting groove  82   a . In actual use, when the roller brush cover plate  11   c  is pressed downward, the spring  83  is stressed and compressed to drive the limiting teeth  81   a  to move downward until the limiting protruding stand  81  of the roller brush cover plate  11   c  is limited and inserted into the limiting sliding groove  82 . In addition, the limiting teeth  81   a  are clamped into the limiting groove  82   a . In this case, the distance between the roller brush scraper  41  and the roller brush  2  is reduced, and the cleaning device is under the mopping condition. The roller brush cover plate  11   c  is pressed downward again, and in this case, the limiting protruding stand  81  is no longer limited and inserted into the limiting sliding groove  82 , and the spring  83  is reset. In addition, the limiting teeth  81   a  and the limiting groove  82   a  are disengaged from the clamped state. In this case, the distance between the roller brush scraper  41  and the roller brush  2  is increased, and the cleaning device is under the sweeping condition. A distance adjustment range implemented by the foregoing mechanical drive may be 1-3 mm, and may be specifically selected based on actual cleaning requirements. No particular limitation is imposed in this embodiment. In another implementation, the cover plate drive  8  may be an electric drive or an electromagnetic coil drive, as long as the distance between the roller brush scraper  41  and the roller brush  2  is adjusted. A person skilled in the art can make conventional technical alternatives for the cover plate drive  8  on the basis of this technical idea. These alternatives all fall within the protection concept scope of the present invention. 
     The above are only the preferred implementations of the present invention, and it should be noted that for a person of ordinary skill in the art, several improvements and modifications may be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as falling within the protection scope of the present invention.