Patent Publication Number: US-2021186290-A1

Title: Cleaning device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims priority to Chinese Patent Application No. CN201911330593.7, filed on Dec. 20, 2019, the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The disclosure relates to the technical field of cleaning devices, and particularly to a cleaning device. 
     BACKGROUND 
     With the rise of smart home devices, as one of the representatives, the floor scrubber is widely used in various places. The floor scrubber is able to intelligently clean the ground, replacing the tedious manual cleaning work. 
     Generally, the floor scrubber carries a wiper to clean the ground. The wiper that has used to clean the ground carries the wastewater and trash, and the wastewater and trash are squeezed into the water filter tank. 
     Obviously, while the trash and wastewater coexist in the water filter tank, the trash will also occupy certain volume, so that the water filter tank will be filled too quickly, causing the user to replace the water filter tank frequently. 
     SUMMARY 
     There is provided a cleaning device according to embodiments of the present disclosure. 
     According to an aspect of embodiments of the present disclosure, there is provided a cleaning device, comprising: 
     a machine body provided with a recess; 
     a front bumper mounted on the machine body; 
     a cleaning assembly comprising a roller configured to clean the ground, wherein the roller is mounted between the machine body and the front bumper; 
     a collecting assembly provided with a wastewater outlet, wherein the collecting assembly is mounted between the machine body and the roller, abutting against the roller and configured to collect and separate trash and wastewater carried by the cleaning assembly; and 
     a water tank provided with a wastewater inlet, wherein the water tank is removably mounted in the recess, and the wastewater flows into the water tank through the wastewater outlet and the wastewater inlet. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       One or more embodiments are exemplified by the corresponding drawings. These exemplary descriptions do not limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise indicated. Figures in the drawings do not constitute a scale limitation. 
         FIG. 1  is a schematic structural view of a cleaning device according to an embodiment of the present disclosure; 
         FIG. 2  is an exploded schematic view of a cleaning device according to an embodiment of the present disclosure; 
         FIG. 3  is a schematic architecture view of a communication between a cleaning device and a processing terminal according to an embodiment of the present disclosure; 
         FIG. 4  is a first cross-sectional schematic view of a cleaning device according to an embodiment of the present disclosure; 
         FIG. 5  is a front view of the machine body shown in  FIG. 1 ; 
         FIG. 6  is a perspective structural diagram of the front bumper shown in  FIG. 1 ; 
         FIG. 7 a    is a perspective structural view of the collecting assembly in  FIG. 1 ; 
         FIG. 7 b    is a schematic cross-sectional view of  FIG. 7   a;    
         FIG. 8 a    is a schematic view of the position of a first sealing assembly in a water tank according to an embodiment of the present disclosure; 
         FIG. 8 b    is a schematic cross-sectional view of a first sealing assembly according to an embodiment of the present disclosure; 
         FIG. 8 c    is a schematic view of the position of a first sealing assembly at a water tank at a first angle according to an embodiment of the present disclosure; 
         FIG. 8 d    is an exploded schematic view of a first sealing assembly according to an embodiment of the present disclosure; 
         FIG. 9 a    is a second cross-sectional schematic view of a cleaning device according to an embodiment of the present disclosure; 
         FIG. 9 b    is a third schematic cross-sectional view of a cleaning device according to an embodiment of the present disclosure; 
         FIG. 9 c    is a first schematic cross-sectional view of a water tank according to an embodiment of the present disclosure; 
         FIG. 10 a    is a fourth cross-sectional schematic view of a cleaning device according to an embodiment of the present disclosure; 
         FIG. 10 b    is a perspective structural view of the machine body of  FIG. 1  at a second angle; 
         FIG. 10 c    is a perspective structural view of a fan module shown in  FIG. 1 ; 
         FIG. 10 d    is an exploded structural view of a fan module shown in  FIG. 1 ; 
         FIG. 11 a    is a top view of a water tank according to an embodiment of the present disclosure; 
         FIG. 11 b    is a perspective structural view of a machine body of  FIG. 1  at a third angle; 
         FIG. 11 c    is a perspective structural view of a machine body of  FIG. 1  after hiding an outer shell; 
         FIG. 11 d    is a second cross-sectional schematic view of a water tank according to an embodiment of the present disclosure; 
         FIG. 12 a    is a fifth cross-sectional schematic view of a cleaning device according to an embodiment of the present disclosure; 
         FIG. 12 b    is a schematic structural view of a front bumper according to an embodiment of the present disclosure; 
         FIG. 13 a    is a perspective view of a machine body of  FIG. 1  at a fourth angle; 
         FIG. 13 b    is a schematic enlarged partial view of AA′ portion of  FIG. 13   a;    
         FIG. 13 c    is a cross-sectional view of  FIG. 13   b;    
         FIG. 13 d    is a second schematic cross-sectional view of a machine body of  FIG. 1 ; 
         FIG. 13 e    is a third schematic cross-sectional view of a machine body of  FIG. 1 , showing that a water cavity of a water tank is empty; 
         FIG. 13 f    is a fourth schematic cross-sectional view of a machine body of  FIG. 1 , showing that there is water in a water cavity of a water tank; 
         FIG. 14 a    is a perspective structural view of a machine body of  FIG. 1  at a fifth angle; 
         FIG. 14 b    is a perspective structural view of a machine body of  FIG. 1  at a sixth angle. 
     
    
    
     DETAILED DESCRIPTION 
     In order to facilitate understanding of the present disclosure, the present disclosure will be described in more detail with reference to the accompanying drawings and embodiments. It will be understood that when an element is referred to as being “fixed to”/“attached to”/“mounted to” another element, it may be directly on the other element or there may be one or more elements therebetween. When an element is referred to as being “connected” to another element, it may be directly connected to the other element or there may be one or more elements therebetween. The terms “vertical,” “horizontal,” “left,” “right,” “inner,” “outer,” and the like as used herein are for purposes of description only. 
     Unless otherwise defined, all technical and scientific terms used in this description have the same meaning as commonly understood by those skilled in the art. The terminology used in the description of the present disclosure is only for the purpose of describing specific embodiments, and is not intended to limit the present disclosure. The term “and/or” as used in the specification includes any and all combinations of one or more related listed items. 
     In addition, the technical features involved in different embodiments of the present disclosure described below may be combined as long as there is no conflict with each other. 
     In this specification, “mounting” includes welding, screwing, snapping, gluing, etc. to fix or restrict an element or device to a specific position or place, and the element or device may be held at a specific position or place, or it may be movable within a limited range. The element or device may be removable or non-removable after being fixed or limited to a specific position or place, which is not limited in the embodiments of the present disclosure. 
     Please referring to  FIG. 1  to  FIG. 3 , an embodiment of the present disclosure provides a cleaning device  100 , including a machine body  200 , a cleaning assembly  300 , a collecting assembly  400 , a water tank  500 , and a front bumper  600 . 
     The cleaning device  100  may include a floor scrubber, a mopping machine, a sweeping robot, and so on. The cleaning device  100  may be constructed in any shape, which may travel on the surface of the ground, a blanket, etc., in order to clean the dirt on the corresponding surface. As shown in  FIG. 1 , the cleaning device  100  is constructed like a truncated cone. 
     It may be understood that the cleaning device  100  may be configured with the automatic navigation and obstacle avoidance functions. During the cleaning process, the cleaning device  100  may automatically navigate to complete the cleaning work, and may also automatically prevent from colliding with the obstacles, when encountering obstacles during cleaning. 
     It may be understood that, referring to  FIG. 4 , the cleaning device  100  may be communicatively connected to the external processing terminal  101  to form an interaction with each other. The cleaning device  100  may notify the processing terminal  101  of the cleaning status, and the processing terminal  101  may send a cleaning command to the cleaning device to control the cleaning device to complete the cleaning work. The processing terminal  101  may be a mobile phone, a computer, a smart watch, a server, and so on. 
     The machine body  200  is provided with a recess  20   a , and the water tank  500  is removably mounted in the recess  20   a . For example, the machine body  200  is provided with a plurality of slot positions, and the water tank  500  is provided with a plurality of protrusions. When the water tank  500  needs to be mounted in the recess  20   a , the protrusion of the water tank  500  just needs to be aligned with the slot position of the machine body  200  and snaps thereinto, in order to mount the water tank  500  to the recess  20   a . Since both the water tank  500  and the machine body  200  are removable from each other, users may replace or renew the water tank  500  at any time, thereby improving the user experience. 
     In the embodiment, the recess  20   a  is provided in the middle of the machine body  200 . As the water tank  500  is mounted in the machine body  200 , the machine body  200  surrounds the water tank  500 . Therefore, while the machine body  200  moves, the water tank  500  may be reliably fixed inside the machine body  200 . 
     The cleaning assembly  300  is mounted to the machine body  200  and is driven to clean by the machine body  200 . The cleaning assembly  300  may be constructed of any cleaning member with a suitable structure, and may complete the cleaning process by any suitable cleaning method, for example, by a roller type cleaning, a rotary type cleaning, and the like. For example, the cleaning assembly  300  comprises a roller  32 , which is mounted between the machine body  200  and the front bumper  600  and abuts against the front bumper  600 . As the cleaning device  100  travels, the roller  32  is taken to rotate. Since the roller  32  will carry a wiper such as a rag to complete the cleaning of the ground, the wiper will therefore carry the trash and wastewater and follow the rolling of the roller  32 . 
     The collecting assembly  400  is provided with a wastewater outlet  40   a . The collecting assembly  400  is mounted between the machine body  200  and the roller  32  and abuts against the roller  32  for collecting and separating the trash and wastewater carried by the cleaning assembly  300 . 
     The water tank  500  is provided with a wastewater inlet  50   a . When the water tank  500  is mounted to the recess  20   a , the wastewater inlet  50   a  is communicated with the wastewater outlet  40   a , and the wastewater may flow into the water tank  500  through the wastewater outlet  40   a  and the wastewater inlet  50   a . The wastewater may be naturally guided into the water tank  500 , or may flow into the water tank  500  by other forces. For example, the machine body  200  may be provided with a fan which generates the wind power, and the wastewater is drawn into the water tank  500  through the wastewater outlet  40   a  and the wastewater inlet  50   a  under the action of the wind force. 
     In the embodiment, when cleaning is required, the user mounts the water tank  500  in the recess  20   a  of the machine body  200 . While the cleaning device  100  travels, the roller  32  is taken to clean the ground, and the wastewater or trash will be carried by the roller  32 . Since the collecting assembly  400  abuts against the roller  32 , while the roller  32  is rotating with the trash and wastewater, the collecting assembly  400  squeezes the roller  32  so that the trash and wastewater on the roller  32  enter the collecting assembly  400 . The collecting assembly  400  separates the trash and wastewater. On the one hand, the trash is left in the cavity of the collecting assembly  400 ; on the other hand, the separated wastewater is discharged from the collecting assembly  400 , and may flow into the water tank  500 . Therefore, the cleaning device  100  realizes the separation of trash and wastewater. After cleaning, the user may take out the water tank  500  and the collecting assembly  400  from the recess  20   a  of the machine body  200 , manually dump the wastewater and other trash in the water tank  500 , and also manually dump the trash left in the collecting assembly  400 . 
     The front bumper  600  is removably mounted to the machine body  200 , and the cleaning assembly  300  is located between the machine body  200  and the front bumper  600 . When the cleaning device  100  encounters an obstacle during traveling, the front bumper  600  may effectively buffer the collision between the cleaning assembly  300  and the obstacle, therefore may protect the cleaning assembly  300  and the machine body  200  more effectively. 
     In some embodiments, referring to  FIGS. 5 and 6 , the side of the front bumper  600  towards the direction of the machine body  200  is provided with a first engagement rib  601 , and the side of the machine body  200  towards the direction of the front bumping  600  is provided with an engagement recess  20   d . While the front bumper  600  is mounted to the machine body  200 , the engagement rib  601  is engaged with the engagement recess  20   d . When the front bumper  600  needs to be removed from the machine body  200 , the engagement rib  601  may be directly pulled out of the engagement recess  20   d.    
     It may be understood that, for mounting and fixing reliably, the number of the engagement rib  601  may be more than one, and correspondingly, the number of the engagement recess  20   d  may be more than one. 
     It may be understood that the engagement rib  601  may be an elastic engagement rib. By the elastic engagement rib, the front bumper  600  may be more quickly and flexibly mounted to the machine body  200  or removed from the machine body  200 . 
     In some embodiments, in order to further secure the front bumper  600  to the machine body  200  reliably, referring to  FIG. 5  and  FIG. 6  again, the side of the front bumper  600  towards the direction of the machine body  200  is also provided with a rotary framework  602 , and the side of the machine body  200  towards the direction of the front bumper  600  is also provided with a rotary slot  20   e . While the front bumper  600  is mounted to the machine body  200 , the rotary framework  602  is rotated and buckled in the rotary slot  20   e . When the front bumper  600  needs to be removed from the machine body  200 , the rotary framework  602  may be directly pulled out of the rotary slot  20   e.    
     In some embodiments, the front bumper  600  may be omitted or may be retained in the cleaning device  100 . 
     In the embodiment, while the cleaning assembly  300  is working, it will carry wastewater and trash to the collecting assembly  400 , so that the collecting assembly  400  may perform collecting and separating operations. In some embodiments, the collecting assembly  400  may be constructed in any suitable structure. 
     Please referring to  FIG. 7 a   , the collecting assembly  400  includes a separating assembly  42  and a flowing tube  44 . 
     The separating assembly  42  is mounted in the machine body  200  and abuts against the cleaning assembly  300 . While the cleaning assembly  300  carries the trash and wastewater, the separating assembly  42  may squeeze the cleaning assembly  300  so that the wastewater and trash on the cleaning assembly  300  are brought into the separating assembly  42 . Then, the separating assembly  42  may collect and separate the trash and wastewater carried by the cleaning assembly  300 . 
     The flowing tube  44  is mounted on the separating assembly  42 . The flowing tube  44  is communicated with the separating assembly  42 . The flowing tube  44  is provided with a wastewater outlet  40   a , and the separated wastewater may flow into the flowing tube  44 . 
     The machine body  200  provides wind power, and the separated wastewater enters the flowing tube  44  under the action of the wind force, and then enters the wastewater inlet  50   a  of the water tank  500  from the wastewater outlet  40   a  of the flowing tube  44 . 
     In some embodiments, the separating assembly  42  includes a separating main board  422 , a first filter  424 , a transition plate  426  and a first scraping bar  428 . 
     The separating main board  422  is removably mounted in the machine body  200  and is provided with a filter groove  422   a . The flowing tube  44  is mounted on the separating main board  422  and is communicated with the filter groove  422   a.    
     The first filter  424  is mounted in the notch of the filter groove  422   a , and is configured to collect and separate the trash and wastewater carried by the cleaning assembly  300 . 
     It may be understood that the first filter  424  may adopt any suitable filter structure, such as a mesh structure and the like. 
     The transition plate  426  is mounted on the separating main board  422  and abuts against the cleaning assembly  300 . In some embodiments, the end of the transition plate  426  towards the cleaning assembly  300  is bent vertically downward to form a slope. The cleaning assembly  300  abuts the transition plate  426 . The transition plate  426  and the cleaning assembly  300  squeeze each other. However, the cleaning assembly  300  may move relative to the transition plate  426 . Therefore, the trash and wastewater carried by the cleaning assembly  300  are brought into the transition plate  426 , and then brought into the separating main board  422  from the transition plate  426 . 
     The first scraping bar  428  is mounted at the abutment of the transition plate  426  and the cleaning assembly  300 . The first scraping bar  428  may scrape off the trash or other litter attached to the cleaning assembly  300 . 
     In the embodiment, when the trash and wastewater are brought into the collecting cavity of the separating main board  422 , the trash is isolated outside by the first filter  424 , and the wastewater flows into the flowing tube  44  under the action of the wind force after filtered by the first filter  424 . 
     In some embodiments, the separating main board  422  is provided with a positioning groove  422   b , and the water tank  500  is provided with a positioning protrusion  50   b . As the positioning protrusion  50   b  is engaged with the positioning groove  422   b , the wastewater inlet  50   a  is communicated with the wastewater outlet  40   a . 
     With such a structure, on the one hand, when the separating main board  422  needs to be removed, since the positioning protrusion  50   b  of the water tank  500  is engaged with the positioning groove  422   b  of the separating main board  422 , the water tank  500  needs to be removed from the recess  20   a  of the machine body  200  before the separating main board  422  may be removed, so as to further prevent the separating main board  422  from popping out during the cleaning process. On the other hand, by virtue of the positioning of the positioning groove  422   b  and the positioning protrusion  50   b , the wastewater inlet  50   a  and the wastewater outlet  40   a  may be communicated with each other efficiently, avoiding cumbersome interface docking processes. 
     In some embodiments, in order to accelerate the flow of wastewater into the water tank  500 , the flowing tube  44  includes a tube body  441  and a flow-guiding part  442 . One end of the tube body  441  is communicated with the separating assembly, and the other end of the tube body  441  is provided with a wastewater outlet  40   a . The flow-guiding part  442  is mounted in the tube body  441 , and the wastewater may quickly be guided to flow out of the wastewater outlet  40   a  and then flow into the water tank  500  by the diversion effect of the flow-guiding part  442   
     Please referring to  FIG. 7 b   , the flow-guiding part  442  includes a first curved surface portion  4421  and a second curved surface portion  4422 . The first curved surface portion  4421  and the second curved surface portion  4422  cooperate with each other to form a guiding channel, and the width of the guiding channel gradually narrows from one end to the other in the vertical upward direction, so that the wastewater may quickly flow into the water tank  500  through the guiding channel. 
     In some embodiments, the first curved surface portion  4421  is protruded from the inner wall of the flowing tube  44 , and the second curved surface portion  4422  is protruded from the inner wall of the flowing tube  44  and is opposite to the first curved surface portion  4421 . The wastewater may slide on the inner surface of the first curved surface portion  4421  or the second curved surface portion  4422  towards the center of curvature, and the wastewater from various directions may slide on the inner surface of the first curved surface portion  4421  or the second curved surface portion  4422  respectively to be quickly guided out of the wastewater outlet  40   a.    
     It may be understood that the first curved surface portion  4421  and the second curved surface portion  4422  are both arc-shaped. 
     It may also be understood that any inner wall of the flowing tube  44  may be provided with a curved surface portion, so as to guide the wastewater out in multiple directions more quickly. 
     It may also be understood that the flow-guiding part  442  may be constructed to any flow-guiding shape, and is not limited to the curved flow-guiding structure provided in the embodiment. 
     As described above, the wastewater is drawn into the water tank  500  for storage. When the user needs to dump the wastewater in the water tank  500 , the user needs to manually remove the water tank  500  from the recess  20   a  of the machine body  200 . However, the water tank  500  often stores the wastewater. During the removal process, the wastewater will be bumped and thrown out to the external environment which causes the secondary pollution and greatly reduces the user experience. 
     Accordingly, in order to prevent the wastewater from being thrown out to the external environment during the removal of the water tank  500  from the main body  200 , the embodiments of the disclosure may be provided with a corresponding sealing assembly, in order to seal the wastewater inlet  50   a  of the water tank  500  during removing the water tank  500 . Please referring to  FIG. 8 a    to  FIG. 8 d   , the water tank  500  includes a first sealing assembly  51 . The first sealing assembly  51  is movably mounted in the wastewater inlet  50   a  and may rotate around the baseline Ma relative to the wastewater inlet  50   a  to seal the wastewater inlet  50   a  or open the wastewater inlet  50   a.    
     For example, when the water tank  500  is placing in the recess  20   a , the machine body  200  acts on the first sealing assembly  51 , so that the first sealing assembly  51  rotates around the baseline  51   a  in a first direction relative to the wastewater inlet  50   a  to open the wastewater inlet  50   a.    
     When the water tank  500  is moving out of the recess  20   a , the first sealing assembly  51  rotates around the baseline  51   a  in a second direction relative to the wastewater inlet  50   a  to seal the wastewater inlet  50   a.    
     The first sealing assembly  51  includes a sealing flap plate  511 , a linkage transmission mechanism  512 , and sealing foam  513 . 
     The sealing flap plate  511  is movably mounted in the water tank  500  and abuts against the wastewater inlet  50   a . Please referring to  FIGS. 8 a  to 8 d   , the water tank  500  is provided with a first rotation hole  50   b  and a second rotation hole  50   c , and the sealing flap plate  511  is provided with a first rotation protrusion  511   b  and a second rotation protrusion  511   c . The first rotation protrusion  511   b  is mounted in the first rotation hole  50   b , and the second rotation protrusion  511   c  is mounted in the second rotation hole  50   c . The baseline  51   a  penetrates the first rotation hole  50   b  and the second rotation hole  50   c.    
     Under the action of an external force, the sealing flap plate  511  may rotate clockwise or counterclockwise with the first rotation hole  50   b  and the second rotation hole  50   c  as two fulcrums. 
     It may be understood that the mounting between the first rotation protrusion  511   b  and the first rotation hole  50   b , or the mounting between the second rotation protrusion  511   c  and the second rotation hole  50   c  may be a threaded mounting method, or may be bearing mounting and so on. 
     In some embodiments, the sealing flap plate  511  has a rectangular shape, which may completely seal the wastewater inlet  50   a.    
     The linkage transmission mechanism  512  is connected to the sealing flap plate  511 , and the linkage transmission mechanism  512  may be a transmission mechanism constructed of any suitable structure. 
     When the machine body  200  applies a force to the linkage transmission mechanism  512 , the linkage transmission mechanism  512  drives the sealing flap plate  511  to rotate around the baseline  51   a  in a first direction relative to the wastewater inlet  50   a , so that the sealing flap plate  511  opens the wastewater inlet  50   a.    
     When the water tank  500  is removing from the machine body  200 , the linkage transmission mechanism  512  drives the sealing flap plate  511  to rotate around the baseline  51   a  in a second direction relative to the wastewater inlet  50   a , so that the sealing flap plate  511  seals the wastewater inlet  50   a.    
     Therefore, with such a sealing structure, on the one hand, the wastewater inlet  50   a  may be effectively opened when the water tank  500  is mounted in the machine body  200 , so that the wastewater inlet  50   a  is communicated with the wastewater outlet  40   a , and then be normally collected into the water tank  500 . On the other hand, it may effectively prevent the wastewater from being thrown out to the external environment from the water tank  500  as the water tank  500  is separated from the machine body  200 , and avoid causing secondary pollution. 
     The sealing foam  513  is arranged on the surface of the sealing flap plate  511  facing the wastewater inlet  50   a , and the sealing foam  513  may seal the wastewater inlet  50   a  more effectively. 
     It may be understood that, in some embodiments, the sealing foam  513  may be omitted or may be retained. 
     In some embodiments, the linkage transmission mechanism  512  includes a lifting pin  5121  and a first resilient member  5122 . 
     One end of the lifting pin  5121  is connected to the sealing flap plate  511 , and the other end of the lifting pin  5121  is suspended toward the machine body  200 . As shown in  FIG. 8 b   , the lower cover  501  of the water tank  500  is provided with a throught hole  50   e , and the opening surface of the throught hole  50   e  is placed with an O-ring  502  and a gasket  503  in sequence, and the shaft holes of the O-ring  502  and the gasket  503  are communicated with the throught hole  50   e . The O-ring  502  is pressed against the lower cover  501  by the gasket  503  through thread fixing, and one end of the lifting pin  5121  passes through the throught hole  50   e  and is connected with the sealing flap plate  511 . The lifting pin  5121  may be moved up and down in the throught hole  50   e  under the action of force. When the lifting pin  5121  is moved upward, the sealing flap plate  511  is pushed to rotate by the lifting pin  5121 . 
     In some embodiments, in order to enable the lifting pin  5121  to be moved up and down in the throught hole  50   e  with high accuracy and reliability, the inside of the throught hole  50   e  is provided with an axle sleeve  504 , which is sleeved on the lifting pin  5121 , so that the axle sleeve  504  may assist the lifting pin  5121  to be moved up and down with high accuracy and without offset. 
     The first resilient member  5122  bears against the water tank  500  at one end and the sealing flap plate  511  at the other end. When an external force acts on the lifting pin  5121 , the lifting pin  5121  is lifted to make the sealing flap plate  511  turn over in order to open the wastewater inlet  50   a . At this time, the first resilient member  5122  is in a compressed state. When the external force is removed from the lifting pin  5121 , the first resilient member  5122  in a compressed state stretches, causing the sealing flap plate  511  to turn over to seal the wastewater inlet  50   a . At this time, the first resilient member  5122  may still be in a compressed state. 
     In order to improve the reliability of the first resilient member  5122  and prevent the first resilient member  5122  from popping out of its original position during compression, in some embodiments, the sealing flap plate  511  is provided with a through hole  511   a . The other end of the first resilient member  5122  passes through the through hole  511   a  and is connected to the sealing flap plate  511 , wherein the axis of the first resilient member  5122  intersects the axis of the through hole  511   a . Since the first resilient member  5122  is obliquely fitted in the through hole  511   a , the first resilient member  5122  is connected to the sealing flap plate  51 , and when the first resilient member  5122  is compressed by the sealing flap plate  511 , the first resilient member  5122  may always be connected to the sealing flap plate  511 , and not easy to pop out of the original position, thereby improving the sealing reliability. 
     In the present embodiment, while the machine body  200  bears against the other end of the lifting pin  5121 , one end of the lifting pin  5121  bears against the sealing flap plate  511  to rotate around the baseline  51   a  in a first direction relative to the wastewater inlets  50   a , such that the sealing flap plate  511  opens the wastewater inlet  50   a.    
     While the water tank  500  is removed out of the machine body  200 , the sealing flap plate  511  is pushed by the first resilient member  5122  to rotate around the baseline  51   a  in a second direction relative to the wastewater inlet  50   a , so that the sealing flap plate  511  seals the wastewater inlet  50   a.    
     Therefore, the water tank with such a sealing structure may prevent the wastewater in the water tank  500  from throwing out of the water tank  500  while the user removes the water tank  500  out of the machine body. 
     In order to improve the reliability of the sealing flap plate  511  sealing the wastewater inlet  50   a , in some embodiments, the linkage transmission mechanism  512  further includes a torsion spring  5123 . The sealing flap plate  511  is provided with a positioning column  5110 , and the torsion spring  5123  is sleeved on the positioning column  5110 . One end of the torsion spring  5123  bears against the sealing flap plate  511 , and the other end of the torsion spring  5123  bears against the inner side wall of the water tank  500 . 
     When the sealing flap plate  511  opens the wastewater inlet  50   a , it presents a certain opening angle with respect to the wastewater inlet  50   a . At this time, the torsion spring  5123  is carried by the sealing flap plate  511  to twist and the distance between one end of the torsion spring  5123  and the other end becomes smaller, and the torsion spring  5123  is in a compressed state. 
     When the water tank  500  is removed from the machine body  200 , the torsion spring  5123  resets and at this time, the distance between one end of the torsion spring  5123  and the other end becomes longer, and the torsion spring  5123  assists the first resilient member  5122  to accelerate the sealing flap plate  511  to rotate around the baseline  51   a  in the second direction relative to the wastewater inlet  50   a , so that the sealing flap plate  511  seals the wastewater inlet  50   a.    
     As mentioned above, when the wastewater is drain into the water tank  500  under the action of wind force, the wastewater will flow into the wastewater cavity  52  of the water tank  500 . Please referring to  FIGS. 9 a  to 9 c   , in the embodiment, the wastewater cavity  52  is communicated with the wastewater inlet  50   a , and the wastewater flows into the wastewater cavity  52  through the wastewater inlet  50   a.    
     The wastewater cavity  52  is a semi-closed water storage structure surrounded by several side plates in the water tank  500 . 
     In some embodiments, the wastewater cavity  52  may be provided with a wastewater lever detecting circuit for detecting the wastewater water level in the wastewater cavity  52 . For example, the wastewater cavity  52  is provided with a probe component, which is electrically connected to the wastewater level detecting circuit. The wastewater level detecting circuit detects the water storage in the wastewater cavity  52  by the probe component. If the wastewater cavity  52  is full, an alarm signal is generated to inform users to dump the wastewater. 
     Generally, when the wastewater enters the wastewater cavity  52  through the wastewater inlet  50   a  under the action of wind force, there will always be large particles in the wastewater. The wastewater and particles mixed in the airflow will easily hit the wastewater cavity  52 , thereby generating great noise and destroying the wastewater cavity. Besides, the particles may not easily fall into the wastewater cavity  52 , and may easily run to other places of the water tank  500 . Therefore, in order to avoid the above situation and the like, in some embodiments, the wastewater cavity  52  is cylindrical and is provided with a tangential inlet  52   a  along the circumscribed direction, and the tangential inlet  52   a  is communicated with the wastewater inlet  50   a.    
     Therefore, under the action of wind force, as shown by the arrows in  FIG. 9 c   , when the wastewater runs out from the wastewater inlet  50   a , the airflow mixed with wastewater directly centrifugally moves along the tangential inlet  52   a , where the wastewater caught in the airflow falls into the wastewater cavity  52  by the gravity. 
     With such a structure of the wastewater cavity  52 , on the one hand, the wastewater is affected by the centrifugal movement and is easy to fall into the wastewater cavity  52 , therefore may be effectively collected by the wastewater cavity  52 . On the other hand, after flowing in the wastewater cavity  52  along the tangential inlet  52   a , the airflow then rotates along the inner wall of the wastewater cavity  52  to perform centrifugal movement to avoid the airflow carrying the wastewater running around irregularly, and also to avoid random impacts on other structures inside the wastewater cavity  52 . 
     In some embodiments, the water tank  500  further includes an air guiding cavity  53 , a partition plate  54 , and a second filter  55 . 
     The air guiding cavity  53  is opposite to the wastewater cavity  52 . The air guiding cavity  53  provides an airflow channel. Under the action of wind force, the airflow first draws the wastewater into the water tank  500  from the wastewater outlet  40   a  and the wastewater inlet  50   a , and then flows in from the tangential inlet  52   a  and makes the centrifugal movement. The wastewater falls into the wastewater cavity under the action of gravity, and the airflow which is making the centrifugal movement directly passes through the airflow channel of the air guiding cavity  53  and flows out to the external environment. 
     In some embodiments, the air guiding cavity  53  is a semi-closed air guiding structure surrounded by several side plates in the water tank  500 . 
     The partition plate  54  is mounted between the wastewater cavity  52  and the air guiding cavity  53 . The partition plate  54  is configured to block the wastewater in the wastewater cavity  52  from flowing into the air guiding cavity  53  and to prevent the airflow from running randomly. 
     In some embodiments, the wastewater cavity  52 , the air guiding cavity  53  and the partition plate  54  may be integrally formed, or may be separately formed and then assembled and integrated in the water tank  500 . 
     The partition plate  54  is provided with a filter hole  54   a , and the second filter  55  is mounted in the filter hole  54   a . As shown in  FIG. 9 a   , the second filter  55  is a cylindrical filter, which surrounds the filter hole  54   a.    
     The airflow flows in from the tangential inlet  52   a  and makes the centrifugal movement. The wastewater is collected by the wastewater cavity  52 , and the centrifugally-moving airflow flows into the second filter  55 , which may further filter out particulate, solid dust and other solid trash like detritus. In general, as shown by the dotted line in  FIG. 9 b   , the airflow mixed with the wastewater successively flows out through the wastewater cavity  52 , the second filter  55 , and the air guiding cavity  53 . 
     By providing the second filter  55 , the trash mixed in the airflow may further filter out, for preventing the trash from running to the air guiding cavity  53  and blocking the air guiding cavity  53 , and so on. 
     In order to improve the reliability of filtration, in some embodiments, referring to  FIG. 9 a    to  FIG. 9 c    again, the water tank  500  further includes a third filter  56 , which is mounted in the air guiding cavity  53  and configured to filter the airflow passed through the second filter  55  again. Referring to  FIG. 9 a   , the third filter  56  is annular and surrounds the filter hole  54   a  and is opposite to the second filter  55 . 
     In the embodiment, as the third filter  56  is further provided, the second filter  55  may prevent the solid trash from entering the third filter  56 , thereby avoiding the situation that the third filter  56  is prone to be fouling and further reducing the frequency of cleaning or replacing the third filter  56 . 
     The third filter  56  not only may further filter out solid trash such as granule, debris, etc., but also has the function of filtering wastewater, preventing the wastewater mixed with the airflow from entering the air guiding cavity  53  from the air outlet. 
     In some embodiments, the third filter  56  is a HEPA filter. It should be noted that the third filter  56  is not limited to the circular ring shape in the present solution, and in other solutions may also be a plate-shaped filter HEPA, Round-shaped filter HEPA and other filters. 
     To facilitate removal of the third filter  56  for cleaning or replacement, in some embodiments, the upper surface of the water tank  500  may have an openable cover. When the third filter  56  needs to be cleaned or replaced, the user may manually open the cover to remove the third filter  56 . 
     In some embodiments, when the water tank  500  is mounted on the machine body  200 , but the cleaning device  100  is not activated by the user to start cleaning, in order to prevent the wastewater in the water tank  500  from entering the air guiding cavity  53  to affect the fan and other components, in some embodiments, the partition plate  54  is further provided with a sealing hole  54   b . The water tank  500  further includes a second sealing assembly  57 , which is mounted in the sealing hole  54   b  and vertically movable along the axis of the sealing hole  54   b  to open or seal the sealing hole  54   b.    
     The second sealing assembly  57  may be in any suitable sealing structure. For example, the second sealing assembly  57  includes a sealing piece and a motor driving mechanism. When the cleaning device  100  is not in operation, the motor driving mechanism drives the sealing piece to seal the sealing hole  54   b . When the cleaning device  100  is in operation, the motor driving mechanism drives the sealing piece to move away from the sealing hole  54   b  to open the sealing hole  54   b.    
     As another example, as shown in  FIG. 9 a   , the second sealing assembly  57  includes a sealing sheet  571  and a telescopic mechanism  572 . 
     The sealing sheet  571  is mounted in the sealing hole  54   b , and the telescopic mechanism  572  is connected to the sealing sheet  571 . While the airflow is pressing the sealing sheet  571 , the telescopic mechanism  572  carries the sealing sheet  571  moving away from the sealing hole  54   b  along the axis of the sealing hole  54   b  to open the sealing hole  54   b . when the airflow is not pressing the sealing sheet  571 , the telescopic mechanism  572  carrying the sealing sheet  571  moves close to the sealing hole  54   b  along the axis of the sealing hole  54   b  to seal the sealing hole  54   b.    
     In some embodiments, in order to automatically seal or open the sealing hole  54   b  under the premise that the airflow is applied or is not applied to the sealing sheet  571 , the telescopic mechanism  572  includes a support  5721 , a second resilient member  5722 , and a bracket  5723 . 
     The support  5721  is provided with a receiving slot  572   a . One end of the second resilient member  5722  is mounted in the receiving slot  572   a , the second resilient member  5722  is sleeved on the bracket  5723 , and the sealing sheet  571  is connected to the bracket  5723 . 
     When the airflow is applied to the upper surface of the sealing sheet  571 , the air pressure causes the bracket  5723  carrying the sealing sheet  571  to compress the second resilient member  5722  and move downward, so that the sealing sheet  571  may open the sealing hole  54   b.    
     When the airflow is not applied to the upper surface of the sealing sheet  571 , the second resilient member  5722  performs a reset movement and pushes the bracket  5723  to move the sealing sheet  571  upward, so that the sealing sheet  571  may seal the sealing hole  54   b.    
     In general, with such a sealing structure, it may effectively prevent wastewater from entering the air guiding cavity  53  when the fan is not working, thereby destroying the fan and the like. 
     As mentioned earlier, the machine body  200  provides wind power. In some embodiments, please referring to  FIG. 4 ,  FIG. 10 a    and  FIG. 10 b   , the machine body  200  includes a main body  21 , a driving assembly  22 , an exhaust duct  23  and a fan module  24 . 
     The driving assembly  22  is mounted in the main body  21  and configured to drive the main body  21  to travel. In some embodiments, the drive component  22  may adopt any suitable driving structure. For example, the driving assembly  22  includes a drive wheel, a chain transmission mechanism, and a drive motor. The drive motor is connected to the chain transmission mechanism. The chain transmission mechanism is connected to the drive wheel. The drive motor outputs the driving force, and drives the chain transmission mechanism to control the driving wheels to rotate, thereby driving the main body  21  to travel. 
     The exhaust duct  23  is mounted in the main body  21  and is communicated with the air guiding cavity  53 , so that the airflow flowing through the air guiding cavity  53  flows into the exhaust duct  23  again. 
     The fan module  24  is mounted to the exhaust duct  23  and is configured to provide the wind power. At this time, under the action of the wind force, the wastewater is drain into the water tank  500  through the wastewater outlet  40   a  and the wastewater inlet  50   a , that is, falls into the wastewater cavity  52 , and then, the airflow enters the air guiding cavity  53  after filtered again through the second filter  55  and the third filter  56 . The airflow entering the air guiding cavity  53  presses the sealing sheet  571 . The sealing sheet  571  moves downward, thus opens the sealing hole  54   b . Then, the airflow passes through the sealing hole  54   b  again, and enters the exhaust duct  23 . The airflow is discharged to the external environment through the exhaust duct  23 . 
     Please referring to  FIG. 10 c    and  FIG. 10 d   , the fan module  24  includes an air nozzle  241 , an air tube  242  and a fan component  243 . 
     The air nozzle  241  is communicated with the exhaust duct  23 , one end of the air tube  242  is communicated with the air nozzle  241 , and the fan component  243  is communicated with the other end of the air tube  242  to provide the wind power to draw the wastewater into the water tank  500  through the wastewater outlet  40   a  and the wastewater inlet  50   a.    
     In some embodiments, the fan component  243  includes a fan bracket  2431 , a fan  2432 , a fan support  2433 , and a fan gasket  2434 . The fan bracket  2431  is mounted at the other end of the fan tube  242  and is communicated with the fan tube  242 . The fan  2432  is mounted on the fan bracket  2431  and is communicated with the fan tube  242 . The fan support  2433  is mounted to the main body  21  and is connected to the fan  2432 . 
     The fan module  24  with such a structure may efficiently and reliably provide wind power to the water tank  500   
     In some embodiments, the water tank  500  may also provide water to the cleaning assembly  300 , so that the cleaning assembly  300  may complete the cleaning work efficiently, without being supplied with water manually. 
     Referring to  FIG. 11 a    to  FIG. 11 d   , the water tank  500  includes a water cavity  58 . The water cavity  58  is configured to provide water for the cleaning assembly  300 . In some embodiments, the upper cover  506  of the water tank  500  is provided with a water injection hole  507  which is communicated with the water cavity  58 . The external water may be injected into the water cavity  58  through the water injection hole  507 . The water in the water cavity  58  may naturally flow to the cleaning assembly  300 , or the water may be pumped to the cleaning assembly  300  through a pump or other components. 
     In some embodiments, in order to prevent impurities such as external dust from polluting clean water through the water injection holes  507 , the cover  506  is also provided with a hole cover  508  which is free to slide so as to cover or open the injection hole  507 . 
     In some embodiments, the machine body  200  is provided with pumping component  700  which is communicated with the water cavity  58 . The pumping component  700  is configured to draw water from the water cavity  58  and provide it to the cleaning assembly  300 . For example, the pumping component  700  includes a pump, a first water tube and a second water tube. One end of the first water tube is communicated with the water cavity  58 , and the other end of the first water tube is communicated with the inlet end of the pump. The outlet end of the pump is communicated with one end of the second water tube, and the other end of the second water tube abuts against the cleaning assembly  300 . 
     The pump draws the water from the water cavity  58  through the first water tube, and supplies the water to the cleaning assembly  300  through the second water tube, so that the cleaning assembly  300  completes the cleaning work. 
     In order to reliably and flexibly supply water to the cleaning assembly  300 , in some embodiments, while the water tank  500  is mounted in the machine body  200 , the pumping component  700  may draw water from the water cavity  58 . 
     For example, the main body  200  is provided with a main-unit water inlet connector  25  and a main-unit water outlet connector  26 . One end of the pumping component  700  is connected to the main-unit water inlet connector  25  and the other end is connected to the main-unit water outlet connector  26 . 
     The water cavity  58  is provided with a water outlet  58   a . When the water tank  500  is mounted in the recess  20   a , the water outlet  58   a  is communicated with the main-unit water inlet  25 . Therefore, the pumping component  700  may draw water from the water cavity  58  through the main-unit water inlet connector  25 , and output the water to the cleaning assembly  300  through the main-unit outlet connector  26 . 
     The water easily contains some impurities, which will greatly affect the lifetime and working reliability of the cleaning assembly  300 , when the water is provided to the cleaning assembly  300  for a long time. 
     Therefore, in some embodiments, the water tank  500  further includes a filter component  59  which surrounds the water outlet  58   a . Before the water is supplied to the cleaning assembly  300 , the filter component  59  may filter some impurities of the water, and the pumping component  700  then supplies the filtered water to the cleaning assembly  300 . 
     In some embodiments, the filter component  59  includes a housing  591  and a fourth filter  592 . 
     Please referring to  FIG. 8A , the housing  591  is provided with a filter inlet  59   a  and surrounds the water outlet  58   a . The fourth filter  592  is mounted at the filter inlet  59   a . Water flows into the water inlet  59   a  through the fourth filter  592 . The water filtered by the fourth filter  592  is output through the water outlet  58   a.    
     In some embodiments, the fourth filter  592  may adopt a metal filter or other suitable filter. 
     In some embodiments, the filter component  59  further includes a third sealing assembly  593  which is received in the housing  591  and is mounted at the water outlet  58   a  and is vertically movable along the axis of the water outlet  58   a.    
     While the water tank  500  is mounted in the recess  20   a , the main-unit water inlet connector  25  bears against the third sealing assembly  593  to move away from the water outlet  58   a  to open the water outlet  58   a.    
     While the water tank  500  is removed from the recess  20   a , the third sealing assembly  593  returns towards the water outlet  58   a  to seal the water outlet  58   a.    
     Therefore, with such a sealing structure, when the water tank  500  is put into the machine body  200 , the water in the water cavity  58  may be output from the water outlet  58   a . When the water tank  500  is removed from the machine body  200 , the water outlet  58   a  is sealed, and the water in the water cavity  58  may not be output to the outside. 
     It may be understood that the third sealing assembly  593  may adopt any suitable sealing structure. For example, in the embodiment, the third sealing assembly  593  includes a slide rail  5931  and a slider  5932 . 
     The slide rail  5931  is mounted in the housing  591  towards the water outlet  58   a . The slider  5932  is mounted in the water outlet  58   a  and is received in the slide rail  5931 . 
     When the slider  5932  is beared against by the main-unit water inlet connector  25 , the slider  5932  may move away from the water outlet  58  along the axis of the water outlet  58   a  to open the water outlet  58   a.    
     When the slider  5932  is not beared against by the main-unit water inlet connector  25 , the slider  5932  may move close to the water outlet  58  along the axis of the water outlet  58   a  to open the water outlet  58   a.    
     In some embodiments, the slider  5932  includes a base  59321  and a guiding rod  59322 . The base  59321  is mounted at the water outlet  58   a . One end of the guiding rod  59322  is mounted on the base  59321 , and the other end is received in the slide rail  5931 . 
     When the base  59321  is beared against by the main-unit water inlet connector  25 , the guiding rod  59322  carries the base  59321  to move away from the water outlet  58   a  in the slide rail  5931 , so that the base  59321  opens the water outlet  58   a , and thus the water may be output through the water outlet  58   a.    
     When the slider  5932  is not beared against by the main-unit water inlet connector  25 , the base  59321  pulls the guiding rod  59322  to move close to the water outlet  58   a  in the slide rail  5931 , so that the base  59321  seals the water outlet  58   a , and thus the water may not be output through the water outlet  58   a.    
     In order to enable the slider  5932  to reliably seal or open the water outlet  58   a , in some embodiments, the third sealing assembly  593  further includes a third resilient member  5933  which is sleeved on the slide rail  5931  and both ends of which bear against the housing  591  and the slider  5932  respectively. When the water outlet  58   a  is opened or sealed, the third resilient member  5933  is in a compressed state. 
     When the base  59321  is supported by the main-unit water inlet connector  25 , the guiding rod  59322  carries the base  59321  to move away from the water outlet  58   a  in the slide rail  5931 , and at the same time, the third resilient member  5933  is compressed, and thus the base  59321  opens the water outlet  58   a  and the water may be output through water outlet  58   a.    
     When the slider  5932  is not beared against by the main-unit water inlet connector  25 , the third resilient member  5933  resets and extends, so that the base  59321  is pushed to pull the guiding rod  59322  to move close to the water outlet  58   a  in the slide rail  5931 , so that the base  59321  seals the water outlet  58   a  and thus the water may not be output through the water outlet  58   a.    
     Since the front bumper  600  abuts against the cleaning assembly  300 , in some embodiments, the front bumper  600  may be configured to provide water to the cleaning assembly  300 , so as to supply water to the cleaning assembly  300  more effectively. 
     Please referring to  FIG. 12 a    and  FIG. 12 b   , the front bumper  600  includes a front bumper body  61  and a spray component  62 . 
     The front bumper body  61  is provided with a front bumper water inlet  61   a  and a front bumper water outlet  61   b . When the front bumper body  61  is removably mounted in the machine body  200 , the front bumper water inlet  61   a  is communicated with the main-unit water outlet connector  26 , and the front bumper water outlet  61   b  is opposite to the cleaning assembly  300 . 
     One end of the spray component  62  is communicated with the front bump water inlet  61   a , and the other end is communicated with the front bump water outlet  61   b.    
     In the embodiment, the pumping component  700  supplies water to the front bumper  600  through the main-unit water outlet connector  26  and the front bumper inlet  61   a . The spray component  62  receives the water through the front water bumper outlet  61   a , divides the water, and output them to the cleaning assembly  300  through the front bumper water outlet  61   b.    
     It may be understood that the spray component  62  may adopt any suitable spray structure. For example, in the embodiment, the number of the front bumper water outlet  61   b  is two, which are respectively located on both ends of the same side of the front bumper body  61  towards the cleaning assembly  300 . The spray component  62  includes two water outlet tubes and a three-way valve. One end of each water outlet tube is communicated with the three-way valve, and the other end of each water outlet tube is respectively connected to the corresponding front bump water outlet  61   b . Therefore, the water is sprayed to the cleaning assembly  300  through the corresponding front bump water outlet  61   b  after being divided by the three-way valve. 
     In some embodiments, the cleaning assembly  300  may occasionally carry relatively large pieces of trash when cleaning trash and debris. The front bumper  600  may scrape away the large pieces of trash first, and then a part of the trash and wastewater enter the collecting assembly  400 . Please referring to  FIG. 4 , the front bumper  600  further includes a second scraping bar  63  which is mounted in the front bumper body  61  and abuts against the cleaning assembly  300 . The second scraping bar  63  may scrape away the trash and debris carried by the cleaning assembly  300 . 
     When the water in the water cavity  58  is used up or the waste water cavity  52  is full of the wastewater, the user needs to be notified of the liquid storage state of the water cavity  58  or the liquid storage state of the wastewater cavity  52 . Therefore, in some embodiments, the cleaning device  100  further includes a liquid level detecting component  800 . When the water tank  500  is mounted in the tank position  20   a , the liquid level detecting component  800  is configured to detect the liquid storage state of the water tank  500 . The liquid storage state includes the height of the liquid level, whether the water has been used up or whether the wastewater exceeds the warning value, etc. 
     In some embodiments, the liquid level detecting component  800  may be mounted in any suitable position, for example, it may be mounted in the machine body  200  or may be mounted in the water tank  500 . 
     Please referring to  FIG. 13 a    to  FIG. 13 f   , the water tank  500  is provided with a protrusion  50   d  that may store liquid, for example, the protrusion  50   d  protrudes from the bottom of the water cavity  58 . It may be understood that the protrusion  50   d  may also be provided in any suitable position in the water tank  500  or the water cavity  58 . 
     In the embodiment, the liquid level detecting component  800  is mounted in the machine body  200 , and is configured to determine the liquid storage state of the water tank  500  by detecting the liquid level state of the protrusion  50   d.    
     It may be understood that the liquid level detecting component  800  may adopt any suitable detecting structure. For example, the liquid level detecting component  800  includes a probe component and a water level detecting circuit. The water level detecting circuit detects the water status of the water cavity  58  by the probe component. 
     For another example, the machine body  200  includes a recess  20   c  adapted to the protrusion  50   d . When the water tank  500  is mounted in the recess  20   a , the protrusion  50   d  is received in the recess  20   c  and the liquid level detecting component  800  may detect the liquid level state of the protrusion  50   d  from now. 
     The liquid level detecting component  800  includes an emitting diode  81  and a receiving diode  82  which are arranged at two opposite sides of the recess  20   c . The receiving diode  82  is configured to receive the light emitted by the emitting diode  81 . In some embodiments, the emitting diode  81  and the receiving diode  82  are directly opposed to each other. 
     In some embodiments, both opposite sides of the recess  20   c  may be provided with via holes  81   a , wherein the emitting diode  81  is provided at the via hole  81   a  on one side of the recess  20   c , and the receiving diode  82  is provided at the via hole  81   a  on the other side of the recess  20   c . The light generated by the emitting diode  81  may enter the protrusion  50   d  through the via hole  81   a  on the one side of the recess  20   c , then be emitted from the protrusion  50   d  to the via hole  81   a  on the other side of the recess  20   c , and finally enter the receiving diode  82  through the via hole  81   a  on the other side of the recess  20   c.    
     It may be understood that the recess  20   c  may be provided with the via hole  81   a  on one side, and the via hole  81   a  may be provided on the side of the emitting diode  81  or the side of the receiving diode  82 . 
     It may be understood that the recess  20   c  may not need to be provided with a via hole. In some embodiments, the protrusion  50   d  and the recess  20   c  are made of a light-transmitting material, and the light generated by the emitting diode  81  may pass through the protrusion  50   d  and the recess  20   c  and be received by the receiving diode  82 . 
     In the embodiment, when the liquid is stored in the protrusion  50   d  of the water tank  500 , the emitted light is refracted in the liquid in the protrusion  50   d  and is not received by the receiving diode  82 . 
     When there is no liquid in the protrusion  50   d  of the water tank  500 , the emitted light passes through the protrusion  50   d  and is received by the receiving diode  82 , so that the user may be notified that the water in the water cavity  58  is used up. 
     In some embodiments, the cleaning device  100  further includes a detecting circuit. The receiving diode  82  is electrically connected to the detecting circuit. The receiving diode  82  generates an electrical signal based on the emitted light, so that the detecting circuit sends an early warning signal based on the electrical signal. For example, when the receiving diode  82  does not receive the emitted light, the receiving diode  82  does not generate the electrical signal. The detecting circuit detects that there is no electrical signal input, and thus determines that there is water in the water cavity  58 . When the receiving diode  82  receives the emitted light, the receiving diode  82  generates an electrical signal, and the detecting circuit detects that there is the electrical signal input, and determines that there is no water in the water cavity  58 , so an early warning signal may be generated. 
     It may be understood that the electrical signal may be at a high level or a low level, or may be other types of suitable signals. 
     It may be understood that the early warning signal may be a voice signal, an optical signal, a message, and so on. The cleaning device  100  may post the early warning signal to the background, user terminal, and so on. 
     It may be understood that the detecting circuit may be a microprocessor or other electronic chip with logic control. 
     It may be understood that the light according to the embodiment may be of any color, such as infrared light and the like. 
     It may be understood that the protrusion  50   d  and the recess  20   c  may be configured into any suitable shape, such as a V shape. 
     After the water in the water cavity  58  is supplied to the cleaning assembly  300 , the cleaning assembly  300  may perform the cleaning work. In some embodiments, referring to  FIG. 14 a    and  FIG. 14 b   , the cleaning assembly  300  includes a roller  32  and a motor component  34 . 
     The roller  32  is movably mounted in the machine body  200 . Generally, the roller  32  will carry some wipers and the like, and when the roller  32  rotates, the wiper will also rotate accordingly. 
     The motor component  34  is mounted in the machine body  200  and connected to the roller  32 . The motor component  34  is configured to drive the roller  32  to rotate. 
     It may be understood that the motor component  34  may adopt any suitable motor drive structure. For example, the motor component  34  includes a motor and a drive shaft. The output end of the motor is connected to one end of the drive shaft, and the other end of the drive shaft is connected to the roller  32 . The motor generates a driving force and drives the roller  32  to rotate through the drive shaft. 
     In some embodiments, the machine body  200  is provided with an engaging slot  20   b . The roller  32  includes a engaging protrusion  321  and a roller body  322 . The engaging protrusion  321  is configured to be engaged with the buckle slot  20   b . One end of the roller body  322  is rotatable mounted on the engaging protrusion  321 , and the other end is connected to the motor component  34 . For example, the engaging protrusion  321  is provided with a bearing hole which is provided with a bearing. One end of the roller body  322  is mounted and fixed in the shaft hole of the bearing, and the other end of the roller body  322  has a four-corner slot structure. The motor component  34  may be reliably and stably connected to the roller body  322 . Therefore, the roller body  322  may rotate relative to the engaging protrusion  321 . 
     In some embodiments, the engaging protrusion  321  may be a semi-curved elastic engaging, which not only facilitates the engaging protrusion  321  to be engaged with the engaging slot  20   b , but also facilitates the roller body  322  to be removed from the engaging slot  20   b.    
     In some embodiments, in order to facilitate the user to remove the roller body  322 , the roller  32  includes a lifting protrusion  323  which is opposite to the engaging protrusion  321 . When the engaging projection  321  is engaged with the engaging slot  20   b , the lifting protrusion  323  is upward in the vertical direction. When the roller body  322  needs to be removed, the user holds the lifting protrusion  323  and may lift the engaging protrusion  321  from the engaging slot  20   b.    
     Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present disclosure, rather than limiting them; under the idea of the present disclosure, the technical features in the above embodiments or different embodiments may also be combined. The steps may be implemented in any order, and there are many other variations of the different aspects of the present disclosure as described above. For simplicity, they are not provided in the details; although the present disclosure has been described in detail with reference to the foregoing embodiments, the skilled in the art should understand that they may still modify the technical solutions described in the foregoing embodiments, or equivalently replace some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure.