CN216439132U - Surface cleaning device - Google Patents

Abstract

The application provides a surface cleaning device, including organism and fuselage, the organism is articulated with the fuselage, the rear side of organism is equipped with two transverse arrangement's supporting wheel, the front side of organism is equipped with the cleaning roller, the bottom of organism is equipped with two transverse arrangement's auxiliary wheel, the rotation center pin of supporting wheel, auxiliary wheel with the rotation center pin of cleaning roller is roughly parallel, the auxiliary wheel is located the cleaning roller with between the supporting wheel, the auxiliary wheel can for the organism moves about from top to bottom so that the cleaning roller keeps roughly constant area of contact with treating the cleaning surface, and wherein, the distance of auxiliary wheel activity from top to bottom is less than the radius of auxiliary wheel. The surface cleaning device can ensure the contact effect of the cleaning roller and the cleaning surface when cleaning the cleaning surface with the raised textures, and improves the cleaning effect.

Description

Surface cleaning device

Technical Field

The application belongs to the technical field of cleaning, and specifically provides a surface cleaning device.

Background

Along with the improvement of the living standard of people, various electric surface cleaning devices gradually enter the daily life of people, and great convenience is provided for the cleaning of the floor of a house. Wherein, cleaning roller and supporting wheel are installed to an electronic surface cleaning device's organism bottom, and supporting wheel and cleaning roller support surface cleaning device, and the cleaning roller can rotate under the drive of motor to also can play the effect that drives surface cleaning device and gos forward when treating the cleaning surface cleanness. Meanwhile, a fixed auxiliary wheel is arranged between the cleaning roller and the supporting wheel on the machine body so as to assist the movement of the surface cleaning device.

However, the floor with concave-convex texture is adopted on the bottom plate of some families, when the surface cleaning device cleans such floors, because the auxiliary wheel is fixed, when the auxiliary wheel contacts with the convex part on the floor, the body can tilt to cause that all or part of the cleaning roller is separated from the contact with the surface to be cleaned in a short time, so that the area which cannot be cleaned by the cleaning roller is increased, and the cleaning effect of the surface cleaning device is affected.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems in the prior art, i.e. to solve the problem that the cleaning roller is separated from the surface to be cleaned due to the fact that the machine body is jacked up by the bulge, the application provides a surface cleaning device, which comprises a machine body and a machine body, wherein the machine body is hinged with the machine body, two transversely-arranged supporting wheels are arranged on the rear side of the machine body, the cleaning roller is arranged on the front side of the machine body, two transversely-arranged auxiliary wheels are arranged at the bottom of the machine body, the rotating central shafts of the supporting wheels and the auxiliary wheels are approximately parallel to the rotating central shaft of the cleaning roller, the auxiliary wheel is arranged between the cleaning roller and the supporting wheel, and can move up and down relative to the machine body to keep a roughly constant contact area between the cleaning roller and a surface to be cleaned, wherein the distance of the up and down movement of the auxiliary wheel is smaller than the radius of the auxiliary wheel.

Alternatively, the auxiliary wheel and the supporting wheel can move left and right relative to the machine body respectively.

Optionally, the distance between the two auxiliary wheels is smaller than the axial length of the cleaning roller and larger than the distance between the two support wheels, and the distance between the auxiliary wheels and the axis of the cleaning roller is smaller than the distance between the auxiliary wheels and the axis of the support wheels.

Optionally, the axial movement distance of the auxiliary wheel is greater than the axial movement distance of the support wheel.

Optionally, the axial moving distance of the auxiliary wheel ranges from 1 mm to 8 mm.

Optionally, a ratio between an area enclosed by a connecting line of contact points of the supporting wheel, the auxiliary wheel and the surface to be cleaned and a projected area of the machine body on the surface to be cleaned is 1/5 to 1/2.

Optionally, a figure defined by connecting lines of contact points of the supporting wheels, the auxiliary wheels and the surface to be cleaned is an isosceles trapezoid, and an angle between the waist and the bottom of the isosceles trapezoid ranges from 60 ° to 80 °.

Optionally, two of the auxiliary wheels are respectively located on a connecting line of the two support wheels and two ends of the cleaning roller.

Optionally, the ratio of the distance between the axis of the auxiliary wheel and the front side edge of the machine body to the length of the machine body in the front-rear direction is in the range of 1/5 to 2/5.

Optionally, the machine body is provided with a scraping strip located at the rear side of the cleaning roller and a detachably connected plate member, and the scraping strip and the auxiliary wheel are both arranged on the plate member, so that the scraping strip, the auxiliary wheel and the plate member are mounted on the machine body as a complete unit.

It will be appreciated by those skilled in the art that the surface cleaning apparatus described herein has at least the following benefits:

1. through set up the auxiliary wheel that can move about from top to bottom between cleaning roller and supporting wheel, treat the cleaning surface at surface cleaning device and clean the time, when the auxiliary wheel with treat the protruding contact on the cleaning surface, the auxiliary wheel can be for the organism activity of upwards under the support of protruding department, then make the organism be close to the cleaning surface of treating, the situation that the organism perk leads to cleaning roller and cleaning surface to break away from the contact has been reduced effectively, thereby guarantee that cleaning roller and the area of contact of treating the cleaning surface can keep roughly constant when the smooth cleaning surface of treating with meet protruding, reduce the unable clear region of cleaning roller, and then improve surface cleaning device's cleaning performance. Further, the auxiliary wheel can be prevented from being completely pressed into the machine body by enabling the auxiliary wheel to move up and down by a distance smaller than the radius of the auxiliary wheel, namely, the auxiliary wheel is guaranteed to be in rolling contact with the protruding part, so that the front side part of the machine body can easily cross the protruding part, and the surface cleaning device is prevented from being clamped.

2. Through making auxiliary wheel and supporting wheel remove for the organism respectively, when surface cleaning device cleans workplaces such as narrow space and furniture bottom, surface cleaning device's organism can utilize the fulcrum that supporting wheel and auxiliary wheel formed to carry out the removal in the certain limit in the left-right direction, the cleaning range on the left-right direction when having enlarged cleaning roller reciprocating motion around surface cleaning device in other words, and auxiliary wheel and supporting wheel can remove for the organism and also make the user slant pulling surface cleaning device more easily, thereby can be more laborsaving when making clean workplaces such as narrow space and furniture bottom, and improve cleaning efficiency.

3. By making the distance between the two auxiliary wheels smaller than the axial length of the cleaning roller and larger than the distance between the two supporting wheels, that is, on the whole, the contact between the body and the surface to be cleaned forms a situation that the front is wide and the back is narrow, because the body is connected to the rear side of the body, when the surface cleaning device turns, the force which is given to the surface cleaning device by a user to turn is transmitted to the rear side of the body by the body, therefore, the contact situation that the body and the surface to be cleaned are wide and the back is narrow makes the rear side of the body turn as the rotation center more easily, so that the rotation center is close to the force applied by the user, and the user can control the surface cleaning device to turn conveniently. And, through making the distance between auxiliary wheel and the cleaning roller axis be less than the distance between auxiliary wheel and the supporting wheel axis, make the contact area of auxiliary wheel and the face of waiting to clean be close to the contact area of cleaning roller and the face of waiting to clean on the one hand, then make the contact of organism and the face of waiting to clean can regard as having the preceding contact zone that utilizes cleaning roller and auxiliary wheel to form, and utilize the back contact zone that the supporting wheel formed, thus make surface cleaning device turn to more easily, on the other hand, the auxiliary wheel is close to the cleaning roller, make the cleaning roller after crossing protruding face of waiting to clean, the auxiliary wheel can contact with protruding face of waiting to clean in time, be convenient for the anterior part of organism to cross the arch.

4. The ratio of the area surrounded by the connecting lines of the contact points of the supporting wheels, the auxiliary wheels and the surface to be cleaned to the projection area of the machine body on the surface to be cleaned is 1/5-1/2, so that the supporting area formed by the supporting wheels and the auxiliary wheels is prevented from being too small, the surface cleaning device is unstable, and meanwhile, the supporting area is prevented from being too large, namely, the space between the supporting wheels and the space between the auxiliary wheels are prevented from being too large to influence the steering of the machine body.

5. The figure formed by the supporting wheels, the auxiliary wheels and the connecting lines of the contact points of the surfaces to be cleaned is isosceles trapezoid, namely, the two supporting wheels and the two auxiliary wheels are symmetrical about the central line of the machine body, so that the machine body is stable when moving forward, and the machine body is prevented from generating uncomfortable feeling. And, make isosceles trapezoid's base angle between 60 to 80 to guarantee that the distance between auxiliary wheel and the supporting wheel can not undersize, guarantee that the distance of auxiliary wheel and cleaning roller can not too big promptly, so that the auxiliary wheel in time contacts with the arch after the cleaning roller crosses the arch.

6. Through making two auxiliary wheels be located two supporting wheels respectively with the line of cleaning roller both ends for the organism is the trend that becomes wider gradually to the front side by the rear side with the contact of treating the cleaning surface on the whole, makes surface cleaning device's removal more stable.

7. Through all setting up auxiliary wheel and scraping strip on the plate body component for scraping strip, auxiliary wheel and plate body component install on the organism as a complete unit, thereby be convenient for the dismouting and the change of scraping strip and auxiliary wheel.

Drawings

Some embodiments of the present application are described below with reference to the accompanying drawings, in which:

figure 1 is an isometric view of a surface cleaning apparatus of a first embodiment of the present application;

FIG. 2 is a bottom view of the housing of the first embodiment of the present application;

FIG. 3 is a schematic structural diagram of a part of a machine body in a first embodiment of the present application;

FIG. 4 is a schematic view of the structure of the auxiliary wheel in the first embodiment of the present application;

FIG. 5 is a schematic structural view of the auxiliary wheel of the first embodiment of the present application when it encounters a projection;

fig. 6 is a simplified schematic diagram of the bottom profile of the machine body in the first embodiment of the present application.

Description of reference numerals:

11. a body; 111. a cleaning roller; 112. a support wheel; 113. an auxiliary wheel; 114. a sewage suction port; 115. a plate member; 116. scraping the strips; 12. a body; 121. a sewage collection barrel; 13. a handle bar.

Detailed Description

It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present application, and not all embodiments of the present application, and the part of the embodiments are intended to explain the technical principles of the present application and not to limit the scope of the present application. All other embodiments that can be obtained by a person skilled in the art based on the embodiments provided in the present application without inventive effort shall still fall within the scope of protection of the present application.

It should be noted that in the description of the present application, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are for convenience of description only, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.

The utility model provides a surface cleaning device includes organism and fuselage, the organism is articulated with the fuselage, the rear side of organism is equipped with two transverse arrangement's supporting wheel, the front side of organism is equipped with the cleaning roller, the bottom of organism is equipped with two transverse arrangement's auxiliary wheel, the supporting wheel, the rotation center pin of auxiliary wheel is roughly parallel with the rotation center pin of cleaning roller, a serial communication port, the auxiliary wheel is located between cleaning roller and the supporting wheel, the auxiliary wheel can be for the organism activity from top to bottom so that the cleaning roller keeps roughly constant area of contact with treating the cleaning surface, and, the distance of auxiliary wheel activity from top to bottom is less than the radius of auxiliary wheel.

The utility model provides a surface cleaning device is through setting up the auxiliary wheel that can move about from top to bottom between cleaning roller and supporting wheel, when surface cleaning device treats the cleaning surface and cleans, when the auxiliary wheel with treat the protruding contact on the cleaning surface, the auxiliary wheel can be for the organism activity of upwards under the effect of bearing of protruding department, then make the organism be close to and treat the cleaning surface, the condition that the organism perk leads to cleaning roller and cleaning surface to break away from the contact has been reduced effectively, thereby guarantee that cleaning roller and the area of contact of treating the cleaning surface can keep roughly constant when leveling treat the cleaning surface with meet protruding, reduce the unable clear region of cleaning roller, and then improve surface cleaning device's cleaning performance. Further, the distance of the up-and-down movement of the auxiliary wheel is smaller than the radius of the auxiliary wheel, when the surface cleaning device encounters the protrusion to be cleaned, the auxiliary wheel can be prevented from being completely pressed into the machine body, namely, the auxiliary wheel is ensured to be in rolling contact with the protrusion, so that the front side part of the machine body can easily cross the protrusion, and the surface cleaning device is prevented from being stuck.

The following describes a specific structure of the surface cleaning apparatus of the present embodiment with reference to the drawings.

The first embodiment of the present application:

as shown in fig. 1 to 3, the surface cleaning apparatus of the present embodiment includes a body 11, a body 12, and a handle bar 13. The body 11 is provided with a cleaning roller 111, a supporting wheel 112 and an auxiliary wheel 113, wherein the cleaning roller 111 is used for wiping a surface to be cleaned, and the supporting wheel 112 and the auxiliary wheel 113 are used for supporting and assisting the surface cleaning device to move. Fuselage 12 and organism 11 pivotal connection, fuselage 12 are equipped with dirty bucket 121 and vacuum motor (not shown in the figure), dirty bucket 121 and vacuum motor intercommunication of collection to dirty bucket 121 and the soil pick-up mouth 114 intercommunication that sets up at organism 11, the vacuum motor who opens is through soil pick-up mouth 114 will treat the dirty suction in the middle of the dirty bucket 121 of collection on the clean face. A handle bar 13 is connected to the body 12 for gripping by a user to control and operate the surface cleaning apparatus.

As shown in fig. 1 and 2, specifically, two support wheels 112 and two auxiliary wheels 113 are provided, respectively, the cleaning roller 111 is provided at the front side of the machine body 11, the support wheel 112 is provided at the rear side of the machine body 11, the auxiliary wheels 113 are provided at positions between the cleaning roller 111 and the support wheels 112, and the auxiliary wheels 113 are movable up and down and left and right with respect to the machine body 11, and the support wheels 112 are movable left and right with respect to the machine body 11.

As can be understood by those skilled in the art, by arranging the auxiliary wheel 113 between the cleaning roller 111 and the supporting wheel 112, and enabling the auxiliary wheel 113 to move up and down relative to the machine body 11, when the surface cleaning device cleans a surface to be cleaned, when the auxiliary wheel 113 contacts with a protrusion on the surface to be cleaned, the auxiliary wheel 113 can move up relative to the machine body 11 under the pressing of the protrusion, and then the machine body 11 is enabled to be close to the surface to be cleaned, the situation that the cleaning roller 111 is separated from the cleaning surface due to tilting of the machine body 11 is effectively reduced, and the situation that the dirt suction port 114 is far away from the surface to be cleaned is reduced, so that the contact area between the cleaning roller 111 and the surface to be cleaned can be kept approximately constant when the cleaning roller is on a flat surface to be cleaned and meets the protrusion, the dirt suction port 114 and the surface to be cleaned can be kept at a close distance, and the areas which the cleaning roller 111 and the dirt suction port 114 can not be cleaned are reduced, thereby improving the cleaning effect of the surface cleaning device.

Moreover, the auxiliary wheel 113 and the supporting wheel 112 can respectively move left and right relative to the machine body 11, when the surface cleaning device cleans the working scenes such as narrow space, furniture bottom and the like, the machine body 11 of the surface cleaning device can move in a certain range in the left and right directions by utilizing a supporting point formed by the supporting wheel 112 and the auxiliary wheel 113, which is equivalent to enlarging the cleaning range of the cleaning roller 111 in the left and right directions when the surface cleaning device reciprocates back and forth, and the auxiliary wheel 113 and the supporting wheel 112 can move left and right, so that a user can more easily pull the surface cleaning device in an inclined way, thereby saving more labor when cleaning the working scenes such as narrow space, furniture bottom and the like, and improving the cleaning efficiency.

Further, the auxiliary wheel 113 moves up and down in a range smaller than its radius.

It can be understood by those skilled in the art that, by making the distance of the up-and-down movement of the auxiliary wheel 113 smaller than its radius, when the surface cleaning device encounters a protrusion with a higher height, after the cleaning roller 111 passes over the protrusion to-be-cleaned surface, the auxiliary wheel 113 can contact with the protrusion to-be-cleaned surface, and the auxiliary wheel 113 is not completely pressed into the body 11, and then keeps rolling contact with the protrusion to-be-cleaned surface, and under the advancing inertia of the surface cleaning device or the pushing action of the user, the auxiliary wheel 113 can easily roll over the protrusion to-be-cleaned surface, and at this time, the front portion of the body 11 passes over the protrusion to-be-cleaned surface, so that most of the gravity of the body 11 is distributed in front of the protrusion to-be-cleaned surface, and the cleaning roller 111 is easily contacted with the to-be-cleaned surface, so that the surface cleaning device obtains the advancing power (i.e. the friction force between the rotating cleaning roller 111 and the to-be-cleaned surface), thereby effectively avoiding the situation that the surface cleaning device can be stuck on the protrusion to-be-cleaned surface higher than the bottom surface of the body 11 .

Referring to fig. 4 and 5, taking one of the auxiliary wheels 113 as an example, a movable cavity allowing the pivot shaft of the auxiliary wheel 113 to move in the up-down direction and the left-right direction of the machine body 11 is formed inside the machine body 11, when the surface cleaning device cleans a flat surface area to be cleaned, the cleaning roller 111 and the supporting wheel 112 form a main support for the surface cleaning device, and the auxiliary wheel 113 also contacts with the surface to be cleaned under the action of its own weight to play a role in auxiliary movement. As shown in fig. 5, when the surface cleaning device encounters the protrusion, after the cleaning roller 111 passes over the protrusion, the auxiliary wheel 113 contacts the protrusion, and the auxiliary wheel 113 moves upward relative to the machine body 11 due to the pressing of the protrusion, so that the machine body 11 is close to the surface to be cleaned, thereby ensuring that the cleaning roller 111 and the dirt suction port 114 are close to the surface to be cleaned. As for the structure that the support wheel 112 moves left and right, that is, a space for allowing the pivot shaft of the support wheel 112 to move left and right is formed inside the body 11, so that the support wheel 112 can move left and right integrally with the pivot shaft, and in addition, a ball that can rotate freely can be provided between the pivot shaft of the support wheel 112 and the body 11, so that the pivot shaft of the support wheel 112 can move left and right more easily while rotating with respect to the body 11.

Referring to fig. 2 and 6, the distance a between the two auxiliary wheels 113 is smaller than the axial length of the cleaning roller 111 and larger than the distance b between the two support wheels 112, that is, the contact condition of the body 11 and the surface to be cleaned forms a condition of being wide in front and narrow in back as a whole, and because the body 12 is connected to the rear side of the body 11, when the surface cleaning device turns, the force given by the user to turn the surface cleaning device is transmitted to the rear side of the body 11 by the handle 13 through the body 12, so that the contact condition of the body 11 and the surface to be cleaned, which is wide in front and narrow in back, makes it easier for the rear side of the body 11 to turn as the rotation center, thereby making the rotation center close to the force applied by the user and facilitating the user to control the surface cleaning device to turn.

With continued reference to fig. 2 and 6, further, in the front-back direction of the body 11, the distance S1 between the auxiliary wheel 113 and the cleaning roller 111 is smaller than the distance S2 between the auxiliary wheel 113 and the supporting wheel 112, so that on one hand, the contact areas of the auxiliary wheel 113 and the cleaning roller 111 with the surface to be cleaned are made to be close, and then the contact of the body 11 with the surface to be cleaned can be regarded as having the front contact area formed by the cleaning roller 111 and the auxiliary wheel 113, and the rear contact area formed by the supporting wheel 112, so that the surface cleaning device is easier to turn, and on the other hand, after the cleaning roller 111 passes over the convex surface to be cleaned, the auxiliary wheel 113 can timely contact with the convex surface to be cleaned, so that the front part of the body 11 passes over the convex.

Preferably, the distance S3 between the auxiliary wheel 113 and the front side of the machine body 11 is 1/5 to 2/5 of the overall length of the machine body 11, specifically 1/5, 1/4, 1/3, 2/5, etc., so as to ensure that the part of the machine body 11 passing over the protrusion under the inertia action after the auxiliary wheel 113 passes over the protrusion is equal to or greater than 1/2 of the overall machine body 11.

Referring to fig. 2 and 4, the axial moving distance d of the auxiliary wheel 113 is greater than the axial moving distance of the supporting wheel 112, that is, the range of the auxiliary wheel 113 moving left and right relative to the machine body 11 is greater than the range of the supporting wheel 112 moving left and right relative to the machine body 11, taking the auxiliary wheel 113 of fig. 4 as an example, the range of moving left and right refers to: the distance between the farthest positions to which the auxiliary wheel 113 can move in the left-right direction, i.e., the left-side imaginary line (the position of the center line when the auxiliary wheel 113 moves to the leftmost side) and the right-side imaginary line (the position of the center line when the auxiliary wheel 113 moves to the rightmost side) in fig. 4. Specifically, the axial movement range of the auxiliary wheel 113 is 1-8mm,

referring to fig. 2 and 6, the ratio of the area defined by the connecting line of the contact points of the supporting wheels 112 and the auxiliary wheels 113 with the surface to be cleaned to the projected area of the body 11 on the surface to be cleaned is 1/5 to 1/2, so as to avoid forming too small supporting area, which results in unstable surface cleaning device, and avoid too large supporting area, i.e. the distance between the supporting wheels 112 and the distance between the auxiliary wheels 113 is too large, which affects the steering of the body 11.

As shown in fig. 2 and 6, the shape defined by the connecting lines of the contact points of the supporting wheels 112 and the auxiliary wheels 113 and the surface to be cleaned is an isosceles trapezoid, specifically, any position of one of the supporting wheels 112 (auxiliary wheels 113) in the moving range, and the other supporting wheel 112 (auxiliary wheel 113) has a position corresponding to the position, so that the two supporting wheels 112 (auxiliary wheels 113) are symmetrical with respect to the center line of the machine body 11, and then the shape defined by the connecting lines of the other supporting wheels 112 and the contact points of the two auxiliary wheels 113 and the surface to be cleaned is an isosceles trapezoid, which makes the machine body 11 more stable when moving forward. Specifically, as for the isosceles trapezoid formed by the supporting wheel 112 and the auxiliary wheel 113 at any position in the moving range, the base angle β of the isosceles trapezoid is between 60 ° and 80 ° to ensure that the distance between the auxiliary wheel 113 and the supporting wheel 112 is not too small, that is, the distance between the auxiliary wheel 113 and the cleaning roller 111 is not too large, so that the auxiliary wheel 113 can contact with the protrusion in time after the cleaning roller 111 passes over the protrusion.

Referring to fig. 2 and 6, further, two auxiliary wheels 113 are respectively located on connecting lines between the two supporting wheels 112 and two ends of the cleaning roller 111, specifically, taking the supporting wheel 112 and the auxiliary wheel 113 on the right side in fig. 6 as an example, connecting lines between the left side and the right side of the supporting wheel 112 and the end of the cleaning roller 111 are respectively made (two dashed lines in fig. 6), in the plane shown in fig. 6, the connecting line between any point on the supporting wheel 112 and the end of the cleaning roller 111 is between the two dashed lines, and the auxiliary wheel 113 (including the wheel body and the pivot shaft) intersects with the two connecting lines between the supporting wheel 112 and one end of the cleaning roller 111 no matter where the auxiliary wheel 113 is located in its movable range, so that the auxiliary wheel 113 is inevitably located on the connecting line between the supporting wheel 112 and the end of the cleaning roller 111, and the contact between the machine body 11 and the surface to be cleaned is gradually widened from the rear side to the front side as a whole, the movement of the surface cleaning apparatus is made more stable.

Referring to fig. 2 and 3, a detachable plate member 115 is disposed on the machine body 11, a scraping bar 116 is disposed on the plate member 115, the scraping bar 116 is disposed at one end of the plate member 115 close to the cleaning roller 111, and is located at the rear side of the cleaning roller 111, the auxiliary wheel 113 is disposed at the bottom of the plate member 115, and the plate member 115 is detachably connected to the machine body 11, so that the plate member 115, the scraping bar 116, and the auxiliary wheel 113 can be integrally connected to the machine body 11, and thus the auxiliary wheel 113 and the scraping bar 116 can be more conveniently disassembled or replaced.

Referring to fig. 1 to 5, in the use process of the surface cleaning apparatus of the present embodiment, a user can control and operate the surface cleaning apparatus by holding the handle bar 13, when cleaning a surface to be cleaned, the rotating cleaning roller 111 wipes the surface to be cleaned, and the vacuum motor sucks dirt on the surface to be cleaned into the dirt collecting barrel 121 through the dirt suction port 114. When the surface cleaning device encounters the protrusion in the cleaning process, the cleaning roller 111 firstly passes through the protrusion, then the auxiliary wheel 113 is contacted with the protrusion, at the moment, the auxiliary wheel 113 can move upwards relative to the machine body 11 under the abutting action of the protrusion, so that the machine body 11 is close to the surface to be cleaned, the cleaning roller 111 can be kept in contact with the surface to be cleaned, and the dirt suction port 114 can be kept close to the surface to be cleaned, so that the dirt suction effect is ensured. Moreover, if the protrusion makes the auxiliary wheel 113 reach the maximum upward movement distance, the auxiliary wheel 113 will not be completely retracted into the body 11, and still can keep sliding contact with the protrusion, under the action of the advancing inertia of the surface cleaning apparatus or the pushing action of the user, the auxiliary wheel 113 can easily roll over the protrusion, at this time, the front portion of the body 11 passes over the protrusion, so that most of the gravity of the body 11 is distributed at the front side of the protrusion, and the cleaning roller 111 can contact with the surface to be cleaned under the action of the gravity, so that the surface cleaning apparatus can obtain the advancing power (i.e. the friction force between the rotating cleaning roller 111 and the surface to be cleaned) again.

As can be understood by those skilled in the art, by arranging the auxiliary wheel 113 between the cleaning roller 111 and the supporting wheel 112, and enabling the auxiliary wheel 113 to move up and down relative to the machine body 11, when the surface cleaning device encounters a convex surface to be cleaned with a height lower than the bottom surface of the machine body 11, the auxiliary wheel 113 can move up relative to the machine body 11 under the abutting pressure of the convex surface to be cleaned, so that the machine body 11 is close to the surface to be cleaned, thereby ensuring that the contact area between the cleaning roller 111 and the surface to be cleaned can be kept approximately constant when the surface cleaning device is flat and encounters the convex surface to be cleaned, and enabling the dirt suction port 114 to be close to the surface to be cleaned, thereby ensuring the cleaning effect of the cleaning roller 111 and the dirt suction port 114, and improving the cleaning effect of the surface cleaning device. Moreover, the distance of the up-and-down movement of the auxiliary wheel 113 is smaller than the radius of the auxiliary wheel 113, after the cleaning roller 111 crosses the protrusion to-be-cleaned surface, the auxiliary wheel 113 can be contacted with the protrusion to-be-cleaned surface, and the auxiliary wheel 113 can not be completely pressed into the machine body 11, so that the front part of the machine body 11 can cross the protrusion, and then the cleaning roller 111 is contacted with the to-be-cleaned surface again, thereby effectively avoiding the situation that the surface cleaning device can be clamped by the protrusion higher than the bottom surface of the machine body 11 to-be-cleaned surface.

Further, the auxiliary wheel 113 and the supporting wheel 112 can respectively move left and right relative to the machine body 11, when the surface cleaning device cleans the working scenes such as narrow space, furniture bottom and the like, the machine body 11 of the surface cleaning device can move in a certain range in the left and right directions by using a supporting point formed by the supporting wheel 112 and the auxiliary wheel 113, which is equivalent to enlarging the cleaning range of the cleaning roller 111 in the left and right directions when the surface cleaning device reciprocates back and forth, and the auxiliary wheel 113 and the supporting wheel 112 can move left and right to enable a user to more easily pull the surface cleaning device in an inclined manner, so that labor can be saved when the working scenes such as narrow space, furniture bottom and the like are cleaned, and the cleaning efficiency is improved.

Second embodiment of the present application:

although not shown in the drawings, the auxiliary wheel of the present embodiment is made of a flexible material, and the pivot shaft is fixed in the up-down direction, unlike the first embodiment. When the surface cleaning device meets the convex surface to be cleaned, the auxiliary wheel is deformed under the gravity and the extrusion action of the protrusion of the surface cleaning device after contacting with the protrusion, so that the auxiliary wheel moves up and down relative to the machine body.

Third embodiment of the present application:

although not shown in the drawings, the auxiliary wheels and the support wheels in the present embodiment move left and right differently from the first embodiment, and specifically, the pivot axes of the auxiliary wheels and the support wheels may not move left and right with respect to the body, but the auxiliary wheels and the support wheels themselves move left and right with respect to the pivot axes.

Fourth embodiment of the present application:

although not shown in the drawings, the support wheels and the auxiliary wheels of the present embodiment are not movable in the left-right direction, unlike the first embodiment. In this embodiment, since the supporting wheel and the auxiliary wheel are not movable from left to right, the ratio between the area enclosed by the connecting lines of the supporting wheel and the contact point of the auxiliary wheel with the surface to be cleaned and the projection area of the body on the surface to be cleaned is 1/5 to 1/2, the graph enclosed by the connecting lines of the supporting wheel and the contact point of the auxiliary wheel with the surface to be cleaned is an isosceles trapezoid, the angle of the bottom side of the isosceles trapezoid is 60 to 80 °, and the two auxiliary wheels are respectively located on the connecting lines of the two supporting wheels and the two ends of the cleaning roller, which all expresses that the above conditions are satisfied for the installation positions of the supporting wheel and the auxiliary wheels on the body.

So far, the technical solutions of the present application have been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the scope of protection of the present application is not limited to these specific embodiments. A person skilled in the art may split and combine the technical solutions in the above embodiments without departing from the technical principle of the present application, and may also make equivalent changes or substitutions for the related technical features, and any changes, equivalents, improvements and the like made within the technical idea and/or technical principle of the present application will fall within the protection scope of the present application.

Claims (10)

1. A surface cleaning device comprises a machine body and a machine body, wherein the machine body is hinged with the machine body, two transversely-arranged supporting wheels are arranged on the rear side of the machine body, a cleaning roller is arranged on the front side of the machine body, two transversely-arranged auxiliary wheels are arranged at the bottom of the machine body, and the rotation central axes of the supporting wheels and the auxiliary wheels are approximately parallel to the rotation central axis of the cleaning roller.

2. The surface cleaning apparatus of claim 1 wherein the auxiliary wheels and the support wheels are movable side-to-side relative to the body, respectively.

3. A surface cleaning apparatus as claimed in claim 1, characterised in that the spacing between the two auxiliary wheels is less than the axial length of the cleaning roller and greater than the spacing between the two support wheels, and the spacing between the auxiliary wheels and the cleaning roller axis is less than the spacing between the auxiliary wheels and the support wheel axis.

4. A surface cleaning apparatus as claimed in claim 2, characterised in that the axial travel of the auxiliary wheel is greater than the axial travel of the support wheel.

5. A surface cleaning apparatus as claimed in claim 4, characterised in that the auxiliary wheel has an axial travel in the range 1 to 8 mm.

6. A surface cleaning apparatus as claimed in any one of claims 1 to 5, characterised in that the ratio between the area enclosed by a line connecting the contact points of the support wheels, the auxiliary wheels and the surface to be cleaned and the projected area of the body on the surface to be cleaned is from 1/5 to 1/2.

7. A surface cleaning apparatus as claimed in claim 6, characterised in that the pattern defined by the lines joining the points of contact of the support wheels and the auxiliary wheels with the surface to be cleaned is an isosceles trapezium having sides angled from the base at an angle in the range 60 ° to 80 °.

8. A surface cleaning apparatus as claimed in any one of claims 1 to 5, characterised in that two of the auxiliary wheels are located on a line connecting the two support wheels to the ends of the cleaning roller.

9. A surface cleaning apparatus as claimed in claim 3, characterised in that the ratio of the distance between the axis of the auxiliary wheel and the front edge of the housing to the length of the housing in the fore-and-aft direction is in the range 1/5 to 2/5.

10. A surface cleaning apparatus as claimed in claim 1, characterised in that the body is provided with a wiper strip at the rear side of the cleaning roller and a detachably connected plate member, the wiper strip and the auxiliary wheel being provided on the plate member such that the wiper strip, the auxiliary wheel and the plate member are mounted on the body as a complete unit.

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