CN215305508U

CN215305508U - Cleaning robot

Info

Publication number: CN215305508U
Application number: CN202120472445.5U
Authority: CN
Inventors: 丁铁
Original assignee: Midea Robozone Technology Co Ltd
Current assignee: Midea Robozone Technology Co Ltd
Priority date: 2021-03-04
Filing date: 2021-03-04
Publication date: 2021-12-28
Anticipated expiration: 2031-03-04
Also published as: WO2022184066A1

Abstract

The utility model belongs to the technical field of cleaning, and particularly relates to a cleaning robot, which comprises a shell, a sweeping component and a mopping component, wherein the sweeping component is arranged on the shell; the mopping device is arranged on the shell, the mopping assembly is positioned at the rear side of the sweeping assembly in the advancing direction of the cleaning robot, the mopping assembly comprises a plurality of mopping units, the mopping units are used for rotating and cleaning the surface to be cleaned, and no gap exists between the projections of the adjacent mopping units on the plane vertical to the advancing direction. When the cleaning robot works, a cleaning surface is cleaned by the sweeping component and then is cleaned by the mopping component positioned at the rear side, and the sweeping component and the mopping component sequentially work, so that the condition that excessive dust is not beneficial to the work of the mopping component is avoided, and the integral working efficiency of the cleaning robot is ensured; the friction between the mopping unit and the surface to be cleaned is larger during rotating cleaning, so that the cleaning effect of the surface to be cleaned is ensured.

Description

Cleaning robot

Technical Field

The utility model belongs to the technical field of cleaning, and particularly relates to a cleaning robot.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

With the improvement of science and technology and the improvement of living standard, the cleaning robot is more and more popular with people, is usually used for cleaning a surface waiting for cleaning on the ground, is simple to operate, has high cleaning efficiency, and gradually becomes a common household appliance of modern families.

However, the cleaning robot in the prior art is generally a sweeping robot, the sweeping robot can only sweep the floor and clean the ground, the function is single, the existing sweeping and mopping integrated cleaning robot usually achieves sweeping and mopping functions by replacing the brush head, manual switching is needed during replacement, the time spent in sweeping and mopping the cleaning task is more, the sweeping and mopping efficiency is low, and the user experience is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to at least solve the problem of low sweeping efficiency of the existing cleaning robot. The purpose is realized by the following technical scheme:

the present invention provides a cleaning robot, including:

a housing;

the sweeping component is arranged on the shell;

the mopping device is arranged on the shell, the mopping assembly is positioned at the rear side of the sweeping assembly in the advancing direction of the cleaning robot, the mopping assembly comprises a plurality of mopping units, the mopping units are used for rotatably cleaning a surface to be cleaned, and no gap exists between the projections of the adjacent mopping units on a plane perpendicular to the advancing direction.

According to the cleaning robot provided by the embodiment of the utility model, the sweeping component and the mopping component are respectively arranged on the shell, and the sweeping component is positioned at the front side of the mopping component, so that when the cleaning robot moves, the sweeping component positioned at the front side can firstly sweep a surface to be cleaned, the surface to be cleaned is cleaned by the mopping component positioned at the rear side after being swept by the sweeping component, the sweeping component and the mopping component sequentially work in sequence, the mopping component can sweep a large amount of dust and then clean, the situation that the mopping component is not beneficial to working due to excessive dust is avoided, and the overall working efficiency of the cleaning robot is ensured; in the embodiment, the plurality of mopping units of the mopping assembly clean the surface to be cleaned in a rotating mode, the friction force between the mopping units and the surface to be cleaned is large when the mopping units rotate to clean, no gap exists between the adjacent mopping units, no cleaning dead angle is generated, and the cleaning effect of the cleaning robot on the surface to be cleaned is ensured.

In addition, the cleaning robot provided by the embodiment of the utility model can also have the following technical characteristics:

in some embodiments of the present invention, the mopping assembly further comprises at least one mopping motor, the mopping motor being in driving connection with the mopping unit.

In some embodiments of the present invention, the number of the mopping motors is one, and the mopping motors are provided with a plurality of output shafts and are in transmission connection with the plurality of mopping units respectively.

In some embodiments of the present invention, the number of the mopping motors is multiple, and each mopping motor is in transmission connection with one mopping unit.

In some embodiments of the present invention, the cleaning robot further comprises a rotation speed detecting device for monitoring rotation speeds of the two mopping motors.

In some embodiments of the present invention, an angle between a rotation axis of the mopping unit and an output shaft of the mopping motor ranges from-2 ° to 2 °.

In some embodiments of the present invention, the cleaning robot further comprises two driving wheels, the two driving wheels being mounted at the bottom of the housing.

In some embodiments of the present invention, a maximum interval between outer edges of the plurality of floor mopping units in a direction perpendicular to a direction in which the cleaning robot advances is greater than an inner interval of the two driving wheels.

In some embodiments of the present invention, the sweeping assembly includes a blower, a side brush and a rolling brush, and the side brush and the rolling brush are disposed at a front side of the mopping unit.

In some embodiments of the present invention, the floor mopping assembly further comprises a water tank and a water jet in communication with the water tank, the water jet being located between the roll brush and the floor mopping unit.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like parts are designated by like reference numerals throughout the drawings.

In the drawings:

fig. 1 is a schematic structural diagram of a cleaning robot according to an embodiment of the present invention;

FIG. 2 is a top view of the cleaning robot of FIG. 1;

FIG. 3 is a top view of the cleaning robot of FIG. 2 with the upper cover removed;

fig. 4 is a bottom view of the cleaning robot shown in fig. 1;

FIG. 5 is a schematic view of the internal structure of the cleaning robot according to the embodiment of the present invention;

fig. 6 is another bottom view of the cleaning robot shown in fig. 1.

The reference symbols in the drawings denote the following:

100. a cleaning robot;

10. a housing; 11. front collision; 12. an upper cover;

21. brushing edges; 22. rolling and brushing; 23. a fan; 24. a dust collecting box;

31. a mopping unit; 32. a mopping motor; 33. a water tank; 34. a water jet;

41. a drive wheel; 42. a universal wheel.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

At present, the sweeping and mopping integrated cleaning robot which can realize sweeping and mopping functions on the market generally sweeps the floor firstly and then mops the floor, and a sweeping module and a mopping module of the robot are required to be manually switched, so that the cleaning time is long, and the cleaning efficiency is low; moreover, when the floor sweeping module and the floor mopping module are manually switched, the hands of a user are easily polluted, so that the user experience is poor; therefore, the cleaning robot provided by the embodiment of the utility model has the advantages that the floor sweeping function and the floor mopping function can be simultaneously or sequentially performed without manual replacement of a user, the cleaning efficiency of the cleaning robot is greatly improved, and the user experience is improved.

As shown in fig. 1 to 5, an embodiment of the present invention provides a cleaning robot 100, the cleaning robot 100 includes a housing 10, a sweeping component and a mopping component, wherein the sweeping component is mounted on the housing 10; the floor mopping device is mounted on the housing 10, and the floor mopping assembly is located at the rear side of the sweeping assembly in the advancing direction of the cleaning robot 100, and the floor mopping assembly comprises a plurality of floor mopping units 31, the plurality of floor mopping units 31 are used for rotating and cleaning the surface to be cleaned, and adjacent floor mopping units have no gap between the projections on the plane perpendicular to the advancing direction.

In the cleaning robot 100 provided by this embodiment, the sweeping component and the mopping component are respectively mounted on the housing 10, and the sweeping component is located at the front side of the mopping component, so that when the cleaning robot 100 moves, the sweeping component located at the front side can sweep a surface to be cleaned first, after the surface to be cleaned is swept by the sweeping component, the surface to be cleaned is then cleaned by the mopping component located at the rear side, the sweeping component and the mopping component sequentially work in sequence, and after the sweeping component sweeps a large amount of dust, the mopping component continues to clean again, thereby avoiding the situation that the mopping component is not beneficial to work due to excessive dust, and ensuring the overall working efficiency of the cleaning robot 100; in the embodiment, the plurality of mopping units 31 of the mopping assembly clean the surface to be cleaned in a rotating manner, when the mopping units 31 rotate to clean, the friction force between the mopping units and the surface to be cleaned is large, and no gap exists between the adjacent mopping units, so that no cleaning dead angle is generated, and the cleaning effect of the cleaning robot 100 on the surface to be cleaned is ensured.

Specifically, referring to fig. 1 and 2, a housing 10 of the cleaning robot 100 according to the present embodiment may be rectangular or approximately rectangular, the housing 10 includes a main body, a front bumper 11 and an upper cover 12, the front bumper 11 is connected to a front side of the main body, and may be specifically connected by a bolt or a screw; the upper cover 12 is connected to the top of the main body; the sweeping component and the mopping component are respectively connected to the main body and can be specifically positioned in the main body and at the bottom of the main body; referring to fig. 4, the sweeping component is disposed on the main body at a position close to the front collision 11, and the mopping component is disposed on the main body at a position far from the front collision 11, that is, when the cleaning robot 100 moves along a set path, any position to be cleaned on the path is firstly swept by the sweeping component and then cleaned by the mopping component.

In some embodiments of the present invention, the sweeping assembly includes a dust collecting module and a dust collecting module, the dust collecting module includes a fan 23, a rolling brush 22 and two side brushes 21, as shown in fig. 4, the number of the side brushes 21 is two, the two side brushes 21 are respectively connected to the bottom of the housing 10 and respectively located at two corners close to the front collision 11, and part of the side brushes 21 exceeds the edge of the housing 10 in the horizontal direction, so as to increase the sweeping range of the sweeping assembly; the rolling brush 22 is connected to the bottom of the housing 10 and is located at a position close to the center of the bottom of the housing 10, and the rolling brush 22 cleans the surface to be cleaned in a rolling cleaning manner; the dust collecting module comprises a dust collecting box 24, as shown in fig. 3, the dust collecting box 24 is arranged in the housing 10, as shown in fig. 5, the fan 23 is arranged in the housing 10, and the fan 23 is communicated with the dust collecting box 24, in the working process of the sweeping assembly in the embodiment, the edge brush 21 and the rolling brush 22 sweep impurities such as dust on the surface to be cleaned, and the impurities such as dust are collected in the dust collecting box 24 under the action of the fan 23.

In some embodiments of the present invention, the mopping assembly specifically includes a plurality of mopping units 31 and a mopping motor 32, and one or more mopping motors 32 may be provided for the mopping motor 32, specifically, the mopping motor 32 is configured to be in transmission connection with the mopping unit 31 and drive the mopping unit 31 to rotate, and the mopping unit 31 is configured to contact with a surface to be cleaned, such as a floor, and clean the surface to be cleaned in a rotating manner. On the basis of the above embodiment, the mopping motor 32 is installed in the housing 10 and is located at a side of the main body of the housing 10 far from the front crash 11, thereby facilitating connection with the mopping unit 31.

In an alternative embodiment, the number of the mopping motors 32 is set to be one, and then the mopping motors 32 are set to be multi-output shaft motors for connecting with the plurality of mopping units 31 respectively, in this embodiment, the number of the mopping units 31 may be two, three or more than three. Specifically, the following embodiment is described taking as an example that the number of the mopping units 31 is set to two.

Correspondingly, the mopping motor 32 can be a motor with double output shafts, and it can be understood that two ends of the motor with double output shafts are respectively provided with an output shaft, and the two output shafts are respectively in transmission connection with the two mopping units 31, so that the two mopping units 31 can be simultaneously driven to rotate, and the rotating speeds of the two mopping units 31 are consistent, thereby realizing uniform cleaning of the surface to be cleaned; moreover, the rotation cleaning mode of the mopping unit 31 in the embodiment increases the friction force between the mopping unit and the surface to be cleaned, and further improves the cleaning effect of the mopping unit 31.

In another alternative embodiment, as shown in fig. 5, the number of the mopping motors 32 is set to be a plurality, and the plurality of mopping motors 32 are respectively in one-to-one correspondence with the plurality of mopping units 31 and are in transmission connection, that is, each mopping motor 32 drives one mopping unit 31 to rotate; the rotation cleaning mode of the mopping unit 31 in the embodiment increases the friction force between the mopping unit and the surface to be cleaned, and further improves the cleaning effect of the mopping unit 31.

On the basis of the above embodiment, in order to ensure that the rotation speeds of the two mopping units 31 are consistent, the cleaning robot 100 in this embodiment further includes a rotation speed detection device for monitoring the rotation speeds of the two mopping motors 32, so as to know the rotation speeds of the two mopping units 31. Specifically, the rotation speed detection means may be provided as a rotation speed sensor; the number of the rotation speed detection devices can be set to two, and the two rotation speed detection devices are respectively used for monitoring the rotation speeds of the two mopping motors 32, so that the rotation speeds of the two mopping motors 32 are ensured to be consistent, and the cleaning effect of the mopping unit 31 is further improved.

It should be noted that, in this embodiment, the rotation speed detecting devices may be in communication connection with a master controller of the cleaning robot 100, and the master controller is in communication connection with the two mopping motors 32, so that, in the working process of the cleaning robot 100, the two rotation speed detecting devices respectively transmit the monitored rotation speed signals of the mopping motors 32 to the master controller, and the master controller controls the two mopping motors 32 by determining whether the rotation speeds of the two mopping motors 32 are consistent. For example, when the rotational speeds of the two mopping motors 32 are not consistent, the general controller may adjust the rotational speed of one of the mopping motors 32 to make the rotational speeds of the two mopping motors 32 consistent.

Further, in the embodiment, the mopping motor 32 is in communication connection with the master controller, and when the mopping motor 32 is overloaded, the master controller can perform overload protection on the mopping motor 32 in a current feedback manner, so that the mopping motor 32 is prevented from continuously running in an overloaded state, and the service life of the mopping motor 32 is further prolonged.

In the present embodiment, the two mopping units 31 have the same structure, the two mopping units 31 may be disposed at intervals or may be disposed in close proximity, and in an alternative embodiment, as shown in fig. 4, the two mopping units 31 are disposed adjacent to each other and the inner side edges of the two mopping units 31 are in contact with each other or slightly overlap each other, such a disposition can prevent omission during the cleaning process, prevent the generation of dead cleaning corners, that is, ensure the cleaning range of the mopping units 31, and further improve the cleaning effect of the mopping units 31.

In another alternative embodiment, as shown in fig. 6, the number of the mopping units 31 is three, the three mopping units 31 may have the same or different structures, and according to the above embodiment, if there is no gap between the projections of every two adjacent mopping units 31 on the plane perpendicular to the advancing direction, the three mopping units 31 are adjacently arranged and the edges of the adjacent mopping units 31 are in contact or slightly overlap, such an arrangement can prevent omission during the cleaning process, prevent dead corners of cleaning, i.e. ensure the cleaning range of the mopping units 31, and further improve the cleaning effect of the mopping units 31.

Further, taking the example that the number of the floor mopping units 31 is two, the floor mopping unit 31 comprises a rotating disc and a mop cloth connected to the rotating disc, and the two floor mopping units 31 have the same structure, so that the two rotating discs have the same structure, as shown in fig. 4, the two rotating discs are both disc-shaped, and have the same diameter, so that the surfaces to be cleaned can be cleaned uniformly; on the basis of the above embodiment, as shown in fig. 5, the mopping unit 31 is in transmission connection with the mopping motor 32, specifically, one side of the rotating disc facing the mopping motor 32 is used for being connected with an output shaft of the mopping motor 32, so that the rotating disc can be rotated by the mopping motor 32, and the mopping unit 31 is rotated and cleaned by the mopping motor 32.

Further, according to the above embodiment, the mopping unit 31 is driven by the mopping motor 32 to rotate around the set rotation axis, in this embodiment, a certain included angle is formed between the rotation axis and the output axis of the mopping motor 32, specifically, the included angle between the rotation axis and the horizontal plane ranges from-2 ° to 2 °, and exemplarily, the included angle may be-1 °, 0 ° or 1 °.

It can be understood that an included angle is formed between the rotating shaft of the mopping unit 31 and the output shaft of the mopping motor 32, and accordingly, the included angle between the rotating shaft of the mopping unit 31 and the horizontal plane ranges from 88 ° to 92 °, so that the included angle between the plane where the bottom surface of the mopping unit 31 is located and the horizontal plane ranges from-2 ° to 2 °, that is, a smaller inclination is formed between the bottom surface of the mopping unit 31 and the horizontal plane, when the mopping unit 31 is driven by the mopping motor 32 to rotate, the smaller inclination increases the pressure between the mopping unit 31 and the part of the surface to be cleaned, thereby increasing the friction between the mopping unit 31 and the surface to be cleaned, and further improving the cleaning effect of the mopping unit 31.

Further, in this embodiment, the mop cloth can be wrapped on the rotating disc, and exemplarily, the mop cloth can be connected to the rotating disc through a fastening member such as a hook and loop fastener or an adhesive, specifically, the mop cloth is connected to a side of the rotating disc away from the floor mopping motor 32, i.e., a downward side of the rotating disc, and the mop cloth is used for contacting with the surface to be cleaned to clean the surface to be cleaned. Further, the mop cloth can clean the surface to be cleaned only by means of rotational friction and also by means of wetting, and for example, the cleaning robot 100 according to the present embodiment may be provided with a water tank 33, and the water tank 33 is used to store water and spray water toward the mop cloth to wet the mop cloth, so that the mop cloth cleans the surface to be cleaned in a wet state.

Further, the cleaning robot 100 provided by the embodiment further includes a traveling assembly, the traveling assembly is used for driving the cleaning robot 100 to move, as shown in fig. 4, the traveling assembly includes two driving wheels 41 installed at the bottom of the housing 10, the two driving wheels 41 are respectively close to the left and right sides of the housing 10 and symmetrically arranged, in addition, the traveling assembly further includes a universal wheel 42, the universal wheel 42 is installed at the bottom of the housing 10, and the universal wheel 42 is arranged at a position close to the front collision 11 of the housing 10 and used for changing the moving direction of the cleaning robot 100, on this basis, the distance between the universal wheel 42 and the two driving wheels 41 is equal, so as to ensure the stability of the cleaning robot 100.

On the basis of the above embodiment, the sweeping assembly includes two side brushes 21 and a rolling brush 22, specifically, the two side brushes 21 are respectively located at two sides of the universal wheel 42; the rolling brush 22 is located between the two driving wheels 41, and the distance between the rolling brush 22 and the two driving wheels 41 is equal, so that the stability of the cleaning robot 100 in the working process is ensured, and the cleaning robot 100 can uniformly clean the surface to be cleaned.

On the basis of the above embodiment, with continuing reference to fig. 4 or fig. 6, in the present embodiment, in the direction perpendicular to the advancing direction of the cleaning robot 100, the maximum distance L1 between the outer edges of the two mopping units 31 is greater than the inner side distance L2 of the two driving wheels 41, and it can be understood that the inner side distance of the two driving wheels 41 refers to the distance between the inner side edges of the two driving wheels 41 in fig. 4; taking the case that the turntable of the two mopping units 31 are both arranged in a circular shape, the maximum width of the two mopping units 31 refers to the length of a line between the outer edges of the two mopping units 31 in the direction perpendicular to the advancing direction of the cleaning robot 100, and the line passes through the centers of the two mopping units 31, i.e., the maximum width that the two mopping units 31 can clean. The arrangement of the two mopping units 31 with the width L1 greater than the distance L2 between the two driving wheels 41 in the present embodiment ensures a larger cleaning range of the mopping unit 31, and further improves the cleaning effect of the mopping unit 31.

Further, in some embodiments of the present invention, the mopping assembly further includes a water tank 33 and a water spraying port 34 communicated with the water tank 33, the water spraying port 34 is communicated with the water tank 33, and the water spraying port 34 can spray water toward the mopping unit 31, it should be noted that the water tank 33 is used for containing clean water or mixed liquid mixed with detergent, disinfectant and the like in the present embodiment, so the water spraying port 34 is used for spraying clean water or other mixed liquid toward the mopping unit 31, and the present embodiment is not particularly limited thereto.

As shown in fig. 3, a water tank 33 is provided in the housing 10; as shown in fig. 4, the water spray 34 is located at the bottom of the housing 10 and between the drum brush 22 and the floor-mopping unit 31, that is, the water tank 33 is located above the water spray 34 in the vertical direction, and the water spray 34 is located at the rear side of the drum brush 22 in the horizontal direction, thereby facilitating the water spray toward the floor-mopping unit 31; on the basis of the above embodiment, the mopping unit 31 comprises a rotating disc and a mop cloth connected with the rotating disc, and in this embodiment, the water or mixed liquid sprayed from the water spraying nozzle 34 can be sprayed onto the mop cloth, so that the mop cloth can rotate and rub with the surface to be cleaned and simultaneously realize the cleaning and other work of the surface to be cleaned.

Further, in the embodiment, the water spraying opening 34 is in communication connection with the general controller of the cleaning robot 100, and the general controller can set the interval time of water spraying of the water spraying opening 34 to ensure that the mopping cloth in the mopping unit 31 is in a wet state, thereby ensuring the cleaning effect of the mopping unit 31.

In addition, in the embodiment, a liquid level sensor may be further disposed in the water tank 33, and accordingly, a display screen or an alarm may be disposed on the cleaning robot 100; level sensor and total controller communication connection, display screen or alarm also with total controller communication connection, level sensor can monitor the liquid level of liquid in the water tank 33, and give total controller with liquid level signal transmission, total controller judges the liquid measure situation in the water tank 33 according to the liquid level, when the liquid level is less than the setting value, total controller control alarm reports to the police or control the display screen and shows that the liquid measure is not enough, thereby remind the user to add water in to the water tank 33.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A cleaning robot, characterized by comprising:

a housing;

the sweeping component is arranged on the shell;

2. The cleaning robot of claim 1, wherein the mopping assembly further comprises at least one mopping motor in driving connection with the mopping unit.

3. The cleaning robot as claimed in claim 2, wherein the number of the mopping motors is one, and the mopping motors are provided with a plurality of output shafts and are respectively in transmission connection with the plurality of mopping units.

4. The cleaning robot as claimed in claim 2, wherein the number of the mopping motors is plural, and each of the mopping motors is in transmission connection with one of the mopping units.

5. A cleaning robot as claimed in claim 4, further comprising rotation speed detection means for monitoring the rotation speeds of both of the mopping motors.

6. The cleaning robot of any one of claims 2 to 5, wherein an angle between a rotation axis of the mopping unit and an output shaft of the mopping motor ranges from-2 ° to 2 °.

7. The cleaning robot of claim 1, further comprising two drive wheels mounted at a bottom of the housing.

8. The cleaning robot of claim 7, wherein a maximum spacing between outer edges of the plurality of mopping units in a direction perpendicular to a direction in which the cleaning robot travels is greater than an inside spacing of the two drive wheels.

9. The cleaning robot of claim 1, wherein the sweeping assembly comprises a fan, a side brush and a roller brush, the side brush and the roller brush being disposed at a front side of the mopping unit.

10. The cleaning robot of claim 9, wherein the mopping assembly further comprises a water tank and a water jet in communication with the water tank, the water jet being located between the drum brush and the mopping unit.