CN212281246U - Cleaning device for electric mop - Google Patents

Abstract

The utility model relates to a belt cleaning device for electric mop, including having the washing bucket that washs the chamber, wash the intracavity be equipped with the corresponding cleaning means of electric mop's clean carousel is equipped with on the clean carousel and wipes the head, clean carousel drive wipe first rotatory scratch cleaning means with the clearance attach to wipe overhead filth, be equipped with protruding spacing platform in the interior respectively on the bucket wall of washing bucket front end and rear end, spacing bench is equipped with the spacing face of relative setting, establish a spacing post between the spacing face, electric mop's host computer bottom is equipped with the spacing groove corresponding with spacing post. This technical scheme is through setting up the spacing face of a spacing post and a pair of relative setting to set up spacing post at two relative regional scopes of spacing face, make the setpoint of spacing post be located between two spacing faces, the user is when placing electronic mop, no matter is with spacing post as the benchmark or with spacing face as the benchmark can both be convenient, quick realization location.

Description

Cleaning device for electric mop

Technical Field

The utility model relates to a domestic cleaning appliance field especially relates to a belt cleaning device for electric mop.

Background

The electric mop in the current market needs the user to manually clean the mop in the cleaning process, especially meets the ground with higher dirt degree, if the mop is not cleaned in time, the ground is difficult to clean, and the dirty mop needs to be touched by hand during manual cleaning, which is a troublesome thing, moreover, the mop needs to be manually replaced and cleaned back and forth, and the cleaning efficiency is reduced.

Therefore, the prior art with the patent number CN110693404A provides a cleaning barrel used in cooperation with an electric mop, wherein two limiting posts are arranged in the cleaning barrel, and the electric mop is limited in the cleaning barrel by the limiting posts cooperating with a positioning mechanism at the bottom of the mop. However, the number of the limiting columns is large, so that the positioning requirement of a user in the process of placing the electric mop is high, and quick alignment installation cannot be realized.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the technical problem at least partially, and provides a cleaning barrel device for an electric mop.

The utility model adopts the technical scheme as follows:

the utility model provides a belt cleaning device for electric mop, is including having the washing bucket that washs the chamber, wash the intracavity be equipped with the corresponding cleaning element of electric mop's clean carousel is equipped with on the clean carousel and wipes the head, clean carousel drive wipe head rotatory scratch cleaning element with the clearance attach to wipe overhead filth, be equipped with protruding spacing platform in the interior on the bucket wall of washing bucket front end and rear end respectively, spacing bench is equipped with the spacing face of relative setting, establish a spacing post between the spacing face, electric mop's host computer bottom is equipped with the spacing groove corresponding with spacing post.

Furthermore, the handle of the electric mop is hinged with the rear end of the main machine through the pivoting component, a locking mechanism for locking the handle when the handle is vertically arranged is arranged in the pivoting component, the limiting groove is arranged at the rear end of the main machine, and the projection of the handle on the main machine is overlapped with the limiting groove when the handle is vertically arranged for locking.

Furthermore, the handle of the electric mop is hinged with the rear end of the main machine through the pivoting component, a locking mechanism for locking the handle when the handle is vertically arranged is arranged in the pivoting component, the limiting groove is arranged at the front end of the main machine, and the projection of the handle on the main machine is not overlapped with the limiting groove when the handle is vertically arranged for locking.

Furthermore, the cleaning device also comprises a sewage barrel with a sewage cavity, the cleaning barrel is placed on the upper part of the sewage cavity, and an overflow port is arranged on the transitional connection surface of the limiting table and the wall of the cleaning barrel.

Furthermore, the cleaning component is detachably erected in the cleaning cavity, the limiting column is arranged on the cleaning component, and a water outlet capable of being opened or closed selectively is formed in the cleaning component.

Furthermore, when the handle rod is vertically locked, the handle rod inclines to the front end of the main machine.

Furthermore, the upper end of the handle rod is provided with a handle part bent towards the rear side, and when the handle rod is vertically locked, the projection of the handle part on the host machine is within the maximum external contour line range of the host machine.

Furthermore, the cleaning part is provided with a curved cleaning rib, and the rotating direction of the cleaning turntable is the same as the inner normal direction of the cleaning rib corresponding to the cleaning turntable.

Furthermore, the cleaning component comprises an inner annular wall and an outer annular wall, the inner annular wall and the outer annular wall are connected through a cleaning rib, and water passing holes are formed among the inner annular wall, the outer annular wall and the cleaning rib in a hollow mode.

Furthermore, the inner ends of the cleaning ribs extend and intersect to the rotation center and/or the extension lines of the inner ends of the cleaning ribs intersect to the rotation center.

In this embodiment, through set up a spacing post on belt cleaning device and remove about in the horizontal plane with the host computer that the restriction reduced electric mop, spacing face through setting up a pair of relative setting is rocked around on the horizontal plane with the restriction reduction host computer, and set up spacing post in two relative regional scopes of spacing face, make the setpoint of spacing post be located between two spacing faces, the user is when placing electric mop, no matter be with spacing post as the benchmark or with spacing face as the benchmark can both make things convenient for, quick realization location, and the regional area of location is big, the location is reliable, it is stable when guaranteeing electric mop and wasing, and then promote the cleaning efficiency.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.

FIG. 1 is a schematic structural view of an electric mop and a cleaning device used in cooperation therewith;

FIG. 2 is a schematic view of the bottom structure of the electric mop according to the first embodiment;

FIG. 3 is an enlarged view of a portion A of FIG. 1;

FIG. 4 is a schematic structural diagram of a cleaning device according to a first embodiment;

FIG. 5 is a schematic top view of the cleaning barrel according to the first embodiment;

FIG. 6 is a partial enlarged view of portion B of FIG. 4;

FIG. 7 is a partial enlarged view of portion C of FIG. 4;

FIG. 8 is a partial top view of the cleaning barrel corresponding to FIG. 5;

FIG. 9 is a schematic top view of a part of a washing tub formed by assembling a plurality of sections of a washing rib according to an embodiment;

FIG. 10 is a schematic top view of a cleaning barrel with a cleaning rib formed by combining bumps according to an embodiment;

FIG. 11 is a schematic view showing the structure of a cleaning apparatus according to a second embodiment;

FIG. 12 is a schematic top view showing the cleaning part according to the second embodiment;

FIG. 13 is an enlarged view of a portion D of FIG. 11;

FIG. 14 is a schematic sectional view showing a drain opening of the cleaning apparatus according to the second embodiment;

FIG. 15 is a schematic sectional view showing the structure of the cleaning apparatus according to the second embodiment with the drain port opened;

FIG. 16 is a schematic side sectional view of the electric mop according to the third embodiment;

fig. 17 is a schematic top view showing the structure of the electric mop according to the third embodiment.

Detailed Description

The technical solution in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

It is to be understood that the described embodiments are merely some embodiments and not all embodiments of the present application, and that the following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application and its applications.

The first embodiment is as follows:

referring to fig. 1 to 10, in the present embodiment, an electric mop 100 is provided, which includes a handle 110, a pivot assembly 130, and a main machine 120, wherein the handle 110 is hinged to a rear end of the main machine 120 through the pivot assembly 130, a motor (not shown) is disposed in the main machine 120, a cleaning turntable 121 is disposed at a bottom of the main machine 120, and an output shaft of the motor extends from the bottom of the main machine 120 and is fixedly connected to the cleaning turntable 121. The cleaning tray 121 is provided with a wiping head (not shown), which can be made of absorbent and fluffy materials such as cleaning pad, cleaning cloth, etc. Preferably, the number of the cleaning rotating discs 121 in this embodiment is two, the cleaning rotating discs are arranged on the left and right sides of the bottom of the main machine 120, the cleaning rotating discs 121 are provided with hook and loop fasteners, and the wiping heads are fixedly attached to the cleaning rotating discs 121 through the hook and loop fasteners. Specifically, the pivoting assembly 130 is provided with a locking mechanism for locking the lever 110 when the lever is erected. It is understood that the pivot assembly and the locking structure thereof may be a universal joint as disclosed in patent application No. CN201610998189.7, and the detailed working process and principle thereof are not described herein.

The embodiment also provides a cleaning device 200 for the electric mop 100, the cleaning device 200 includes a cleaning barrel 220, a cleaning cavity is formed in the cleaning barrel 220, a cleaning component 210 is arranged in the cleaning cavity, and the cleaning component 210 corresponds to the cleaning turntable 121 of the electric mop 100. After the electric mop cleans the ground, the electric mop is placed in a cleaning cavity of a cleaning barrel, a motor drives a cleaning turntable to rotate after a cleaning mode is started, and the cleaning turntable drives a wiping head to rotate and scrape a cleaning rib on a cleaning part so as to clean dirt attached to the wiping head.

Further, a limit column 212 is arranged on the cleaning part 210, a limit groove 122 corresponding to the limit column 212 is arranged at the bottom of the main machine 120, inward convex limit bosses 223 are respectively arranged on the barrel walls of the front end and the rear end of the cleaning barrel opposite to the limit column 212, limit surfaces 223a opposite to each other are arranged on the limit bosses 223, the limit column 212 is arranged between the two opposite limit surfaces 223a, and the limit surfaces 223a of the limit bosses 223 position the front end and the rear end of the electric mop during cleaning. Specifically, the clearance between the limiting surface and the corresponding positioning area on the electric mop is not more than 5 mm.

Compare and set up two spacing posts and carry out the mode of fixing a position electric mop in prior art in the washing bucket, remove on the horizontal plane with the restriction reduction host computer through setting up a spacing post in this embodiment, rock around on the horizontal plane with the restriction reduction host computer through setting up the spacing face of a pair of relative setting, and set up spacing post in the relative regional scope of two spacing faces, make the setpoint of spacing post be located between two spacing faces, the user is when placing electric mop, no matter be with spacing post as the benchmark or with spacing face as the benchmark can both make things convenient for, quick realization location, and the regional area of location is big, the location is reliable, it is stable when guaranteeing electric mop to wash, and then promote cleaning efficiency.

Optionally, the limiting groove is formed in the front end of the host, and when the handle is vertically locked, the projection of the handle of the electric mop on the host is not overlapped with the limiting groove.

Preferably, the limiting groove 122 is disposed at the rear end of the main body 120, and when the handle 110 is vertically locked, the projection of the handle 110 of the electric mop on the main body 120 overlaps with the limiting groove 122.

The electric mop can sway left and right when cleaned in the cleaning device, particularly the swinging of the handle bar is obvious, the limiting groove is arranged at the bottom of the rear end of the host, the projection of the electric mop on the host is overlapped with the limiting groove when the locking is vertically arranged on the handle bar, so that the central axis of the limiting groove is close to coincide with the central axis of the handle bar, the swinging of the handle bar is reduced by shortening the length of the swinging force arm of the handle bar, the cleaning stability of the electric mop is improved, and particularly under the condition of no person to watch, the electric mop is prevented from being turned over due to large swinging.

Further, the cleaning device 200 further comprises a slop pail 230 with a sewage cavity, the cleaning pail 220 is erected at the mouth of the slop pail 230, and an overflow opening 222 is arranged on the transitional connection surface of the limiting table 223 and the cleaning pail wall.

Through setting up the slop pail and carrying out temporary storage collection to filth and sewage in the washing bucket in the cleaning process, prevent to make dirty ground, the user only need empty the slop pail after the washing is accomplished can. In addition, because the washing bucket erects at the oral area of slop pail for the distance between the perisporium of washing bucket and the perisporium of slop pail is less, and the water flow resistance is great and influences the overflow speed when leading to the overflow, through locating the overflow mouth on the transition connection face of spacing platform and washing bucket wall, can realize faster overflow speed with the overflow mouth of minimum quantity.

In this embodiment, the cleaning component 210 and the cleaning barrel 220 are integrally formed, the cleaning component 210 is disposed at the bottom of the cleaning barrel 220, and the cleaning barrel 220 is provided with a water outlet 221. Alternatively, the drain port 221 is provided on the bottom wall, that is, the cleaning member 210 in this embodiment. Preferably, the drainage port 221 is disposed on the limiting surface of the limiting table, and the lower end of the drainage port 221 is not higher than the bottom wall of the cleaning component 210.

The water outlet is arranged on the peripheral wall of the cleaning barrel, and the lower end of the water outlet is not higher than the bottom wall of the cleaning component, so that dirt and sewage deposited at the bottom of the cleaning cavity after cleaning can be discharged from the water outlet.

Preferably, the area of the water outlet is set to ensure that the maximum water level in the cleaning cavity naturally runs for about 30S-2 min. When the mop is used specifically, a user adds cleaning water into the cleaning cavity, then the cleaning barrel is placed into the cleaning cavity and is started to clean, and along with the continuous cleaning of the wiping head, the water in the cleaning barrel is gradually reduced to enable the electric mop to enter a dewatering stage.

Furthermore, the cleaning component 210 is provided with a curved cleaning rib 211, and the rotation direction of the cleaning turntable 121 is the same as the inner normal direction of the cleaning rib 211 corresponding to the cleaning turntable. Preferably, as shown in fig. 5, the cleaning turntable located on the left side of the main body rotates clockwise along the dotted path with an arrow in the drawing, and the cleaning turntable located on the right side of the main body rotates counterclockwise along the dotted path with an arrow in the drawing.

In this embodiment, the cleaning rib may be a continuous strip as shown in fig. 5 and 8, may be formed by combining multiple segments as shown in fig. 9, or may be formed by combining bumps as shown in fig. 10.

In order to clean the surface to be cleaned, the cleaning surface of the wiping head is provided with closely-arranged fibers with certain lengths, and during the cleaning process, dirt gradually gathers on the cleaning surface of the wiping head and is gradually embedded among the fibers, so that the cleaning is difficult. In this embodiment, through the clean muscle of the curvilinear figure that is equipped with interior normal direction and clean carousel's rotation direction unanimity on the cleaning element for the head is scraping the in-process to the washing muscle, and the fibre on the head is cleaned and is blockked and effectively disperse away by the clean muscle of curvilinear figure, and the filth of especially fibre root that is hidden between the fibre can be by easy washing and scraping back break away from the head of wiping, thereby will wipe the head sanitization. In addition, because the fibers on the wiping head are regularly loosened, the phenomenon that the motor is burnt out due to the fact that the fibers on the wiping head are wound with each other to increase damping can be avoided, and the working reliability of the motor is guaranteed.

Optionally, the cleaning part is further provided with curved cleaning ribs and/or radial linear cleaning ribs, wherein the inner normal direction of the curved cleaning ribs is opposite to the rotation direction of the cleaning turntable.

Through setting up multiple type washing muscle for in the cleaning process, the fibre on the head is wiped periodically and is scraped at the washing muscle surface of different grade type, and dirty can be scraped by the ascending power of a plurality of directions and break away from and make and wipe the head and be washd totally.

Preferably, in this embodiment, the cleaning ribs on the cleaning component are all curved, and the inner normal direction of the cleaning ribs is the same as the rotation direction of the cleaning turntable.

Further, the inner ends of the cleaning ribs 211 extend to meet the rotation center and/or the extension lines of the inner ends of the cleaning ribs meet the rotation center. Preferably, in this embodiment, wash muscle 211 including first washing muscle 211a, the inner of first washing muscle 211a extends to intersect to the rotation center, wash the muscle including the second and wash muscle 211b, the inner extension line of second washing muscle 211b intersects to the rotation center, first washing muscle 211a just is central symmetrical arrangement with second washing muscle 211b circumference in turn. It is understood that the center of rotation here refers to the center of rotation of the cleaning turntable when placed on the washing device.

The inner that will wash the muscle sets up and does not extend to intersect to the rotation center and/or wash the inner extension line of muscle and intersect to the rotation center for wipe the head at rotatory clean in-process, every turn certain angle within range the effective length of wasing the muscle is the longest, thereby makes the cleaning action maximize of scraping, promotes abluent effect.

Further, a convex part is arranged on the upper surface of the cleaning rib 211. Preferably, the projections are bumps.

The electric mop inevitably adheres to hairs in the cleaning process, and the hairs are usually adhered to the fiber head of the wiping head, so that the fibers cannot be effectively dispersed if the hairs cannot be removed. The upper surface of the cleaning rib is provided with the protruding part, so that hair on the wiping head can be hung on the protruding part and separated from the wiping head during cleaning, and subsequent fiber root cleaning is facilitated.

Example two:

as shown in fig. 11 to 15, the present embodiment is different from the first embodiment in that: the cleaning barrel 220 and the cleaning component 210 are arranged in a split manner, the cleaning component 210 is detachably erected in the cleaning cavity, a space for containing cleaning water is formed between the bottom of the cleaning component 210 and the bottom of the cleaning barrel 220, a water outlet capable of being selectively opened or closed is formed in the bottom of the cleaning cavity, and the limiting column is arranged on the cleaning component 210.

The washing bucket is at the abluent in-process of electric mop, and the inevitable adhesion in surface of washing bucket and cleaning element has dirty, can reduce inconvenient clear dead angle through can dismantling the setting with the cleaning element components of a whole that can function independently of washing bucket, and convenience of customers washs the washing bucket. In addition, still set up the selective outlet that opens or close in the bottom of washing chamber, the outlet is closed during the washing, and the user can open the outlet as required after the washing is accomplished in order to discharge the sewage in the washing chamber, facilitates the use.

Specifically, as shown in fig. 14 and 15, a pedal 231 and a valve rod 232 are arranged on the sewage bucket 230, the middle of the pedal 231 is hinged to the sewage bucket 230, a torsion spring for returning is further arranged at the hinged position of the pedal 231 and the sewage bucket 230, the middle of the valve rod 232 is hinged to the sewage bucket 230, the hinged position of the valve rod 232 and the sewage bucket 230 is also provided with a torsion spring for returning, one end of the pedal 231 is exposed out of the bucket body for a user to pedal, one end of the valve rod 232 is provided with a valve body for blocking the water outlet 221, the other end of the pedal 231 is in transmission fit with the other end of the valve rod 232, and when the user pedals the exposed end of the pedal, the pedal rotates and drives the valve rod to rotate to open the water outlet.

Further, the cleaning component 210 comprises an inner annular wall 213 and an outer annular wall 214, the inner annular wall 213 and the outer annular wall 214 are connected through a cleaning rib, and hollow water passing holes are formed among the inner annular wall 213, the outer annular wall 214 and the cleaning rib. In this embodiment, the two ends of the second cleaning rib 211b are respectively connected to the inner annular wall 213 and the outer annular wall 214, the outer end of the first cleaning rib 211a is connected to the outer annular wall 214, and the inner annular wall 213 is connected to the middle of the first cleaning rib 211 a.

Therefore, the cleaning rib, the inner ring wall and the outer ring wall are staggered to form a net structure, the overall strength of the cleaning part is better, the hollow water passing holes formed among the inner ring wall, the outer ring wall and the cleaning rib are large in area, dirt can effectively pass through the water passing holes in time in the cleaning process, and the cleaning efficiency is improved.

Optionally, a stepped portion is further disposed on the wall of the cleaning barrel 220, and the stepped portion supports the cleaning component 210.

Preferably, the bottom of the washing component 210 is provided with a support part 215 protruding downwards, and the support part 215 abuts against the bottom wall of the washing tub. Specifically, the supporting portion 215 is also disposed at the intersection center of the first cleaning ribs 211a, so as to enhance the strength of the cleaning member in supporting the electric mop and the working stability in cleaning.

Example three:

as shown in fig. 16 and 17, the present embodiment is different from the first and second embodiments in that: when the handle bar 110 of the electric mop is vertically arranged and locked, the handle bar 110 inclines to the front end of the main machine 120, and an included angle theta is formed between the handle bar 110 and the vertical line of the main machine 120.

When the electric mop is placed and is cleaned in the cleaning barrel, the cleaning rotary table inevitably generates whole machine shaking during rotation due to gravity center lifting, side turning can be caused when the electric mop is in unmanned nursing, the gravity center of the whole machine is more stable due to the fact that the handle bars are arranged in a forward tilting mode, shaking in the cleaning process is reduced, and even unmanned reading can be achieved, and user experience is improved.

Furthermore, the upper end of the handle 110 is provided with a handle part 110a bent to the rear side, the handle 110 is inclined towards the front end of the main unit 120 so that the projection of the handle part 110a of the handle 110 on the main unit 120 is within the range of the maximum external contour line S3 of the main unit 120, in fig. 17, the closed contour line S1 is the projection contour line of the handle on the main unit, and S2 is the contour line of the limiting groove.

It should be noted that, in order to realize the adjustment of the length of the stick, the stick may be formed by multiple segments of sleeves, at least when the length of the stick is the longest, the projection of the stick on the host is within the range of the maximum external contour line S3 of the host.

When this embodiment electric mop placed alone, the front end slope of barre to the host computer when the locking was established immediately to the barre for the biggest external contour line within range of host computer is located to the projection of handle portion on the host computer, and electric mop can not placed by blockking of handle portion when leaning on wall etc. and convenience of customers places, promotes space utilization.

In the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or units must have a specific orientation, be constructed and operated in a specific orientation. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Claims (10)

1. The utility model provides a belt cleaning device for electric mop, is including having the washing bucket that washs the chamber, wash the intracavity be equipped with the corresponding washing part of electric mop's clean carousel is equipped with on the clean carousel and wipes the head, clean carousel drive wipe head rotatory scratch washing part with the clearance attach to wipe overhead filth, its characterized in that is equipped with protruding spacing platform in interior respectively on the bucket wall of washing bucket front end and rear end, is equipped with the spacing face of relative setting on the spacing platform, establish a spacing post between the spacing face, electric mop's host computer bottom is equipped with the spacing groove corresponding with spacing post.

2. The cleaning device for the electric mop as claimed in claim 1, wherein the handle of the electric mop is hinged to the rear end of the main body through a pivoting assembly, a locking mechanism for locking the handle when the handle is erected is arranged in the pivoting assembly, the limiting groove is formed in the rear end of the main body, and the projection of the handle on the main body is overlapped with the limiting groove when the handle is erected and locked.

3. The cleaning device for the electric mop as claimed in claim 1, wherein the handle of the electric mop is hinged to the rear end of the main body through a pivoting assembly, a locking mechanism for locking the handle when the handle is erected is arranged in the pivoting assembly, the limiting groove is formed in the front end of the main body, and the projection of the handle on the main body when the handle is erected and locked is not overlapped with the limiting groove.

4. The cleaning device for the electric mop as claimed in claim 1, 2 or 3, further comprising a sewage tank having a sewage chamber, wherein the cleaning tank is disposed at an upper portion of the sewage chamber, and an overflow port is disposed on a transitional connection surface between the limiting table and a wall of the cleaning tank.

5. The cleaning device for the electric mop as claimed in claim 4, wherein the cleaning member is detachably mounted in the cleaning chamber, the position-limiting posts are provided on the cleaning member, and the cleaning member is provided with a water outlet which can be selectively opened or closed.

6. The cleaning apparatus for an electric mop as claimed in claim 2 or 3, wherein the lever is inclined toward the front end of the main body when the lever is vertically locked.

7. The cleaning device for the electric mop as claimed in claim 6, wherein the upper end of the handle is provided with a handle portion bent to the rear side, and a projection of the handle portion on the main body when the handle is locked in an upright position is within a maximum circumscribed outline of the main body.

8. The cleaning device for the electric mop as claimed in claim 1, 2 or 3, wherein the cleaning member is provided with a curved cleaning rib, and the rotation direction of the cleaning turntable is the same as the inner normal direction of the cleaning rib corresponding thereto.

9. The cleaning device for an electric mop as claimed in claim 8, wherein the cleaning member comprises an inner annular wall and an outer annular wall, the inner annular wall and the outer annular wall are connected by a cleaning rib, and water passing holes are formed among the inner annular wall, the outer annular wall and the cleaning rib.

10. The cleaning apparatus for an electric mop as claimed in claim 8, wherein the inner ends of the cleaning ribs extend to meet the rotation center and/or the inner ends of the cleaning ribs extend to meet the rotation center.

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