CN218922477U

CN218922477U - Self-cleaning water-scraping mop with water lifting basket

Info

Publication number: CN218922477U
Application number: CN202221939966.8U
Authority: CN
Inventors: 吴澎; 吴新华
Original assignee: Nanjing Youpeng Heming Technology Co ltd
Current assignee: Nanjing Youpeng Heming Technology Co ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2023-04-28
Anticipated expiration: 2032-07-26

Abstract

The utility model belongs to the field of household articles, and particularly relates to a self-cleaning water scraping mop with a water lifting basket. Mainly comprises a mop head, a mop rod and a cleaning wiper; a prismatic cleaning wiper strip is arranged in the cleaning wiper, and the cleaning wiper strip shaft is arranged in a front bracket of the cleaning wiper; the cleaning wiper strip is triangular prism-shaped, and the side surface of the triangular prism, which faces the front bracket, is a limiting surface; the distance from the adjacent edges of the limiting surface to the mounting shaft is larger than the distance from the inner side of the front bracket to the mounting shaft; the distance from the limiting surface to the mounting shaft is smaller than the distance from the inner side of the front bracket to the mounting shaft, and the cleaning wiper strip can turn around the mounting shaft within a certain angle without excessive rotation; the edge opposite to the limiting surface is a wiper edge, and the upward turning amplitude of the wiper edge is smaller than the downward turning amplitude, so that the squeezing and scraping force is strong when the wiper is used for wiping downwards, and the wiper edge is smooth and free from stagnation when being lifted upwards.

Description

Self-cleaning water-scraping mop with water lifting basket

Technical Field

The utility model belongs to the technical field of cleaning tools, and particularly discloses a self-cleaning water scraping mop with a water lifting basket.

Background

The flat mop has large area and good cleaning effect, is popular with users, and is more attractive because the self-cleaning flat mop is cleaned without touching water by hands. Two general categories are distinguished by different dewatering modes: one type is a flat mop with a squeezing, dehydrating and stroking mop barrel, such as the Chinese patent application ZL 201710221885.1, wherein the mop barrel is provided with an independent squeezing area and an independent cleaning area; the flat mop head is rotated to a state capable of being cleaned and squeezed when the flat mop head is cleaned and squeezed, and the flat mop head can be kept in the cleaning and squeezing state through the positioning device between the flat mop head and the mop rod; the flat mop head is separated from the control of the positioning device during mopping so as to rotate to a mopping state; when squeezing water, the flat mop head moves and extrudes between the squeezing area and the stroking port extrusion device so as to squeeze water for wiping objects; during cleaning, the flat mop head moves and extrudes between the cleaning area and the stroking extrusion device so as to carry out moving extrusion cleaning on the wiping object. The disadvantage is that a specially made mop bucket with a complicated structure is required.

Another type is hand-push squeezing type dehydration, such as ZL201420624020.1, ZL201720489369.2, which includes a mop rod and a flat mop plate movably connected to the mop rod, wherein a squeezing mechanism is disposed on the mop rod, and squeezing and cleaning of the wiping object on the flat mop plate are achieved by relative squeezing movement between the squeezing mechanism and the flat mop plate. Compared with the first category, the method is simpler and lighter. The disadvantages of this are: when the squeezing operation is carried out, the mop rod is needed to be held by one hand for positioning, the squeezing mechanism is needed to be held by the other hand, the relative squeezing movement between the squeezing mechanism and the flat mop plate is realized through the push-pull squeezing mechanism, the operation is very laborious, the mop head can be lifted together when the squeezing mechanism is lifted, the squeezing mechanism can not squeeze and move relative to the mop head, and the operability is not strong.

And in both designs, the water level required by the mop cleaning needs to be higher than that of the whole mop, or a very deep cleaning barrel or a very long cleaning barrel, so that a large amount of water resources are wasted.

Disclosure of Invention

1. Technical problem to be solved by the utility model

The utility model aims to solve the technical problems of how to design a simpler, more convenient and efficient self-cleaning water-scraping mop, so that the squeezing and scraping force is strong when the water-scraping mop is used for scraping water, the water-scraping mechanism is lifted upwards smoothly without blocking, the self-cleaning water-scraping mop can be cleaned at a very low water level, and the water is saved.

2. Technical proposal

In order to solve the problems, the technical scheme provided by the utility model is as follows: the self-cleaning wiper mop with the water lifting basket is designed and mainly comprises a mop head, a mop rod and a cleaning wiper; the middle part of the back surface of the mop head is movably connected with the mop rod; the cleaning wiper is sleeved on the mop rod, and the front bracket and the rear bracket of the cleaning wiper are surrounded to form a convex cleaning wiper hole; a prismatic cleaning and scraping strip is arranged in the front support, a guide wheel is arranged in the rear support, and a cleaning and scraping gap is formed between the guide wheel and the cleaning and scraping strip; when the cleaning wiper is used, the mop head is sleeved in the cleaning wiper hole, the cleaning wiper moves up and down, and the cleaning wiper strip slides up and down on the wiping surface of the mop head to clean and wipe water.

Further, the front support is further provided with a water lifting basket, the water lifting basket is located above the cleaning wiper strip, the upper portion of the water lifting basket is provided with an opening, and water outlets are arranged in rows towards one side of the cleaning wiper hole.

Further, the cleaning wiper is movably sleeved on the mop rod through a sleeve, and the sleeve is connected with the rear bracket through a connecting guide rod; the connecting guide rod passes through a guide hole of a guide piece fixedly arranged on the mop rod.

Further, the cleaning wiper strip shaft is installed in a front bracket of the cleaning wiper; the cleaning wiper strip is triangular prism-shaped, and the side surface of the triangular prism, which faces the front bracket, is a limiting surface; the distance from the adjacent edges of the limiting surface to the mounting shaft is larger than the distance from the inner side of the front bracket to the mounting shaft; the distance from the limiting surface to the mounting shaft is smaller than the distance from the inner side of the front bracket to the mounting shaft, and the cleaning wiper strip can turn around the mounting shaft within a certain angle without excessive rotation; the edge opposite to the limiting surface is a wiper edge, and the upward turning amplitude of the wiper edge is smaller than the downward turning amplitude, so that the squeezing and scraping force is strong when the wiper is used for wiping downwards, and the wiper edge is smooth and free from stagnation when being lifted upwards.

Further, a water outlet is arranged on the adjacent surface of the lower side of the wiper edge, and correspondingly, a water inlet communicated with the water outlet is arranged on the limiting surface.

Further, the limiting surface is an arc surface, and the inner side of the front support is provided with a holding rib corresponding to the arc surface of the limiting surface, so that the cleaning wiper strip turns more stably, and the amplitude is controllable.

Further, the water outlet holes on the side wall of the water lifting basket are provided with a plurality of rows, and the lower water outlet holes are larger than the upper water outlet holes.

Further, when the cleaning wiper is lifted upwards to clean, the water lifting basket lifts a basket of water from the water container, flows out through the water outlet holes on the side wall and washes the wiping surface of the mop head.

Further, the water lifting basket lifts a basket of water from the water container, flows out through the water outlet hole on the side wall, enters the water inlet of the limit surface of the cleaning and scraping strip, flows out from the water outlet, and washes the wiping surface of the mop head.

Further, the movable connection of the mop head and the mop rod is a rotary positioning mechanism; comprises an arc-shaped connector arranged between the mop head and the mop rod, and an elastic telescopic jack post arranged in a cylinder at the top end of the mop rod; the connecting head is connected with a fork-shaped connecting piece shaft at the top end of the mop rod, the center of the connecting head is a connecting shaft, a smooth cambered surface surrounds the connecting shaft, a positioning groove is formed in at least one side of the cambered surface, and the distance from the positioning groove to the connecting shaft is smaller than the distance from the cambered surface to the connecting shaft; the connection part of the top column top at the cambered surface can freely move, and the mop head and the mop rod are limited at the positions parallel to each other when the top column top is positioned in the positioning groove.

Further, the mop head base plate is formed by sectionally combining, the middle section is a hollow aluminum alloy section, the two ends of the middle section are inserted with plastic parts, the plastic parts are provided with gear shaping which is sleeved with a wiping object, one end of the gear shaping can be folded towards the wiping surface, and a fastening piece which is prevented from being folded is arranged.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

(1) According to the self-cleaning water wiping mop with the lifting basket, the distance from the adjacent edges of the triangular prism-shaped cleaning water wiping strip limiting surface to the mounting shaft is larger than the distance from the inner side of the front bracket to the mounting shaft; the distance from the limiting surface to the mounting shaft is smaller than the distance from the inner side of the front bracket to the mounting shaft, so that the triangular prism-shaped cleaning wiper strip can turn around the mounting shaft within a certain angle and cannot excessively rotate; the width of the upward turning of the wiper edge is smaller than the width of the downward turning, so that when the wiper edge is used for downward wiping, the trend of the upward turning of the wiper edge is prevented by the interference between the adjacent upper edge of the triangular prism limiting surface and the inner side of the front support, the wiper edge stretches into more cleaning wiper holes, the squeezing wiper force with the wiping surface of the mop head is strong, when the mop head is lifted upwards, the width of the downward turning of the wiper edge is larger, the stretching into less cleaning wiper holes is formed, and the cleaning wiper can move upwards smoothly without stagnation.

(2) According to the self-cleaning water scraping mop with the water lifting basket, when the water lifting basket descends to the bottom along with the cleaning wiper, cleaning water can be fully filled in a lower water level, in the lifting process, the cleaning water flows out from the side holes, the mop wiping surface is comprehensively cleaned, a large amount of water can be saved, a special water container is not needed, and the self-cleaning water scraping mop has wide adaptability.

Drawings

FIGS. 1 and 2 are schematic views showing the overall structure of the present utility model at different angles;

FIGS. 3 and 4 are schematic views showing different view angles of the cleaning wiper according to the present utility model;

FIGS. 5, 6 and 7 are schematic views showing the positions and structures of cleaning wiper strips of the cleaning wiper with different angles of view according to the present utility model;

FIGS. 8, 9 and 10 are schematic views showing the structure of the squeezing and scraping parts of the cleaning wiper with different angles of view according to the present utility model;

FIGS. 11 and 12 are schematic views showing the relative positions of the cleaning wiper and the mop head according to different views of the present utility model;

FIG. 13 is a schematic view showing the internal structure of a front bracket of a wiper of the present utility model;

fig. 14, 15, 16 and 17 are schematic views of the mop head and the connection portion according to the present utility model;

reference numerals in the schematic drawings illustrate: a mop head 100; a middle section 101; a plastic part 102; gear shaping 103; fastening members 104; cleaning the wiper 200; cleaning the wiper hole 201; a front bracket 210; a water lifting basket 211; a lower drain hole 212; upper drain water holes 213; a mounting shaft hole 215; a rear bracket 220; a guide wheel 221; a guide hole 301; a connecting guide 302; a sleeve 303; mop rod 400; a connection shaft 401; a fork-type connection 402; a connector 403; a positioning groove 404; cleaning the wiper strip 500; wiper edges 501; a limit surface 502; a water inlet 503; a water outlet 504; a mounting shaft 505; and a clasping rib 512.

Detailed Description

For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples.

The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and are not intended to limit the scope of the utility model, since any modification, variation in proportions, or adjustment of the size, etc. of the structures, proportions, etc. should be considered as falling within the spirit and scope of the utility model, without affecting the effect or achievement of the objective. Also, the terms "upper", "lower", "left", "right", "middle", and the like are used herein for descriptive purposes only and are not intended to limit the scope of the utility model for modification or adjustment of the relative relationships thereof, as they are also considered within the scope of the utility model without substantial modification to the technical context.

Referring to fig. 1 to 4, the present utility model mainly includes a mop head 100, a mop rod 400, and a washing wiper 200; the middle part of the back of the mop head 100 is movably connected with the mop rod 400; the cleaning wiper 200 is movably sleeved on the mop rod 400 through a sleeve 303, and the sleeve 303 is connected with the rear bracket 220 through a connecting guide rod 302; the connection guide 302 passes through a guide hole 301 of a guide member fixed to the mop rod 400. The connection guide 302 may be of a cylindrical type, preferably a prismatic type, and more particularly, a hexagonal prismatic structure, and accordingly, the guide hole 301 may be of the same type as the connection guide 302, so that deflection occurring when the washing wiper 200 slides up and down may be prevented.

The front bracket 210 and the rear bracket 220 of the cleaning wiper 200 are surrounded to form a convex cleaning and wiping hole 201; the front bracket 210 is internally provided with a triangular prism-shaped cleaning and wiping strip 500, the rear bracket 220 is internally provided with a guide wheel 221, a cleaning and wiping gap is formed between the guide wheel 221 and the cleaning and wiping strip 500, and the mop head 100 passes through the gap.

When cleaning and wiping, the mop head 100 is sleeved in the cleaning and wiping hole 201, the sleeve 303 is held to move up and down, the head of the cleaning wiper 200 moves up and down relative to the mop head 100 under the action of the connecting guide rod 302, and the cleaning and wiping strip 500 slides up and down on the wiping surface of the mop head 100 to clean and wipe the wiping object on the wiping surface.

Referring to fig. 5 to 13, as a more preferable embodiment, the front bracket 210 is further provided with a water lifting basket 211, the water lifting basket 211 is located above the cleaning wiper strip 500, the upper part of the water lifting basket 211 is opened, and water outlets are arranged in a row toward one side of the cleaning wiper hole 201. When cleaning is needed, the water lifting basket 211 firstly moves to the bottom of the mop head 100 in a vertical state under the control of the sleeve 303, is filled with cleaning water, then lifts along the wiping surface of the mop head 100, and the water flows out from the water outlet holes to wash the wiping surface of the mop head 100.

As a more preferred embodiment, the cleaning wiper strip 500 is shaft-mounted in a mounting shaft hole 215 in the front bracket 210 of the cleaning wiper 200; the cleaning wiper strip 500 is a triangular prism, and a side surface of the triangular prism facing the front bracket 210 is a limiting surface 502; the distance from the adjacent edges of the limiting surface 502 to the mounting shaft 505 is greater than the distance from the inner side of the front bracket 210 to the mounting shaft 505; the distance from the limiting surface 502 to the installation shaft 505 is smaller than the distance from the inner side of the front bracket 210 to the installation shaft 505, and the cleaning wiper strip 500 can turn up and down around the installation shaft 505 within a certain angle without excessive rotation; the edge opposite to the limiting surface 502 is a wiper edge 501, the distance from the upper edge adjacent to the limiting surface 502 to the mounting shaft 505 is greater than the distance from the lower edge adjacent to the limiting surface 502 to the mounting shaft 505, and the upward turning amplitude of the wiper edge 501 is smaller than the downward turning amplitude.

By the above design, when the cleaning wiper strip 500 is used for cleaning the mop head 100, the wiper edge 501 is pushed by the wiper on the wiping surface of the mop head 100 to turn upwards, the upper edge adjacent to the triangular prism limiting surface 502 is contacted with the inner side of the front bracket 210, the wiper edge 501 stretches into the cleaning wiper hole 201 or the guiding wheel 221 more, and the ready cleaning wiper gap between the guiding wheel 221 and the cleaning wiper strip 500 is smaller, so that the squeezing wiper force with the wiping surface of the mop head is strong. When the wiper blade 501 is lifted upwards, the downward turning width of the wiper blade 501 is larger, the wiper blade 501 stretches into less direction of the cleaning wiper hole 201 or the guiding wheel 221, the ready cleaning wiper gap between the guiding wheel 221 and the cleaning wiper strip 500 is larger, and the cleaning wiper 200 moves upwards smoothly without blocking.

As a more preferable embodiment, the limiting surface 502 is an arc surface, the inner side of the front bracket 210 is provided with a holding rib 512 corresponding to the limiting surface 502, and the limiting surface 502 turns around the holding rib 512, so that the cleaning wiper strip 500 turns more stably, the turning angle can be accurately adjusted, and the cleaning wiper strip can be matched with mop heads 100 with different thicknesses, so as to achieve the best cleaning wiper effect.

As a more preferable embodiment, the lower adjacent surface of the wiper blade 501 is provided with a water outlet 504, correspondingly, the limiting surface 502 is provided with a water inlet 503 communicated with the water outlet 504, and the cleaning water of the lifting basket 211 flows in from the water inlet 503 of the limiting surface 502 and flows out through the water outlet 504 of the lower adjacent surface of the wiper blade 501 to flush the wiping surface of the mop head 100, so as to achieve a better cleaning effect.

As a more preferred embodiment, the sidewall water outlets of the basket 211 have a plurality of rows, and the lower drain water outlet 212 is larger than the upper drain water outlet 213. This scheme can guarantee the cleaning performance, can ensure again that when carrying the basket 211 operation to mop head 100 top, the washing water that holds runs out, does not influence the next step to scrape the water operation effect downwards.

Referring to fig. 14 to 17, in order to achieve a better cleaning and wiping effect, the movable connection between the mop head 100 and the mop rod 400 is a rotary positioning mechanism; comprises an arc-shaped connector 403 arranged between the mop head and the mop rod, and an elastic telescopic jack arranged in a cylinder at the top end of the mop rod 400; the connecting head 403 is connected with a fork-shaped connecting piece 402 at the top end of the mop rod 400 in a shaft way, the center of the connecting head 403 is a connecting shaft 401, a smooth cambered surface surrounds the connecting shaft 401, a positioning groove 404 is arranged on a curved surface on one side of the cambered surface, and the distance from the positioning groove 404 to the connecting shaft 401 is smaller than the distance from the cambered surface to the connecting shaft 401; the connection of the top post can freely move when the top post is in the cambered surface, and the mop head 100 and the mop rod 400 are limited to be in a parallel position when the top post is in the positioning groove 404. At this time, the mop head 100 more smoothly passes through the cleaning wiper hole 201 in the cleaning wiper 200. Of course, the structural form of the rotary positioning mechanism is not limited by the description of the embodiment, so long as the mop head can keep the cleaning and water scraping state, and the flat mop head is separated from the control of the rotary positioning mechanism when mopping the floor, so that the flat mop head rotates to the floor mopping state.

As a more preferred embodiment, the mop head 100 mainly comprises a base plate and a wiping article fixed on the base plate, the back surface of the base plate is movably connected with a mop rod 400, the base plate of the mop head 100 is formed by sectionally combining, the middle section 101 is a hollow aluminum alloy section, the two ends of the middle section are connected with plastic pieces 102 in an inserting mode, the plastic pieces 102 are provided with gear shaping 103 sleeved with the wiping article, one end of the gear shaping 103 can be folded towards the wiping surface, and a fastening piece 104 capable of avoiding folding is arranged.

The aluminum alloy section bar middle section 101 can be cut into different lengths according to the requirements to manufacture the mop heads 100 with different lengths, and the connecting guide rods 302 with corresponding lengths are selected to manufacture the mops with different specifications. The sleeve openings are sewn at the two ends of the wiping object of the mop and are sleeved on the gear shaping 103, the gear shaping 103 turns over towards the wiping surface, so that the distance between the gear shaping 103 at the two ends is reduced, and the wiping object is conveniently sleeved; the distance between the gear teeth 103 at the two ends is increased after the gear teeth 103 are aligned, the wiping object is tightened and then fastened by the fastening piece 104, and the wiping object is kept flat and stable in the cleaning, water scraping and mopping processes.

The guide wheel 221 can be replaced by a guide slide block in the present utility model, and the simple replacement of the guide wheel 221 should be regarded as the equivalent scheme of the present utility model.

In a specific implementation process, the self-cleaning water scraping mop with the water lifting basket can be matched with a common water container for use, and a special cleaning barrel can be configured, namely, a bracket is arranged in the common cleaning barrel and higher than the water surface for supporting the lower end of the mop head 100, so that when the cleaning wiper 200 is driven to scrape water downwards, the lower end of the mop head 100 is placed on the bracket, the sleeve 303 can be operated by one hand, and meanwhile, the sleeve 303 can be operated by one hand because no blocking exists when the cleaning is lifted upwards.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims

1. A self-cleaning wiper mop with a water lifting basket mainly comprises a mop head (100), a mop rod (400) and a cleaning wiper (200); the middle part of the back surface of the mop head (100) is movably connected with the mop rod (400);

the method is characterized in that: the cleaning wiper (200) is sleeved on the mop rod (400), and a front bracket (210) and a rear bracket (220) of the cleaning wiper (200) are surrounded to form a convex cleaning wiper hole (201); a prismatic cleaning and wiping strip (500) is arranged in the front support (210), a guide wheel (221) is arranged in the rear support (220), and a cleaning and wiping gap is formed between the guide wheel (221) and the cleaning and wiping strip (500);

when cleaning and scraping, the mop head (100) is sleeved in the cleaning and scraping hole (201), the cleaning wiper (200) moves up and down, and the cleaning and scraping strip (500) slides up and down on the wiping surface of the mop head (100) to clean and scrape water.

2. A self-cleaning wiper mop as defined in claim 1, wherein: the front bracket (210) is also provided with a water lifting basket (211), the water lifting basket (211) is positioned above the cleaning wiper strip (500), the upper part of the water lifting basket (211) is provided with an opening, and water outlet holes are arranged in rows towards one side of the cleaning wiper hole (201).

3. A self-cleaning wiper mop as defined in claim 1, wherein: the cleaning wiper (200) is movably sleeved on the mop rod (400) through a sleeve (303), and the sleeve (303) is connected with the rear bracket (220) through a connecting guide rod (302); the connecting guide rod (302) passes through a guide hole (301) of a guide piece fixedly arranged on the mop rod (400).

4. A self-cleaning wiper mop as defined in claim 1, wherein: the cleaning wiper strip (500) is axially mounted in a front bracket (210) of the cleaning wiper (200); the cleaning wiper strip (500) is a triangular prism, and the side surface of the triangular prism, which faces the front bracket (210), is a limiting surface (502); the distance from the adjacent edges of the limiting surface (502) to the mounting shaft (505) is larger than the distance from the inner side of the front bracket (210) to the mounting shaft (505); the distance from the limiting surface (502) to the mounting shaft (505) is smaller than the distance from the inner side of the front bracket (210) to the mounting shaft (505); the edge opposite to the limiting surface (502) is a wiper edge (501), and the upward turning amplitude of the wiper edge (501) is smaller than the downward turning amplitude.

5. A self-cleaning wiper mop as defined in claim 4, wherein: a water outlet (504) is arranged on the adjacent surface of the lower side of the wiper blade (501), and correspondingly, a water inlet (503) communicated with the water outlet (504) is arranged on the limiting surface (502).

6. A self-cleaning wiper mop as defined in claim 4, wherein: the limiting surface (502) is an arc surface, and the inner side of the front bracket (210) is provided with a holding rib (512) corresponding to the arc surface of the limiting surface (502).

7. A self-cleaning wiper mop as defined in claim 2, wherein: the side wall water outlet holes of the water lifting basket (211) are provided with a plurality of rows, and the lower water outlet holes (212) are larger than the upper water outlet holes (213).

8. A self-cleaning wiper mop as defined in claim 1, wherein: the movable connection of the mop head (100) and the mop rod (400) is a rotary positioning mechanism; comprises an arc-shaped connector (403) arranged between the mop head and the mop rod, and an elastic telescopic jack column arranged in a cylinder at the top end of the mop rod (400); the connecting head (403) is connected with a fork-shaped connecting piece (402) at the top end of the mop rod (400) through a shaft, the center of the connecting head (403) is provided with a connecting shaft (401), a smooth cambered surface surrounds the connecting shaft (401), a positioning groove (404) is formed in at least one side of the cambered surface, and the distance from the positioning groove (404) to the connecting shaft (401) is smaller than the distance from the cambered surface to the connecting shaft (401); the joint of the jacking column top at the cambered surface can freely move, and the mop head (100) and the mop rod (400) are limited at the positions parallel to each other when the jacking column top is positioned in the positioning groove (404).

9. A self-cleaning wiper mop as defined in claim 1, wherein: the mop head (100) comprises a substrate and a wiping object fixed on the substrate, the back of the substrate is movably connected with a mop rod (400), the substrate is formed by sectionally combining, the middle section (101) is a hollow aluminum alloy section, the two ends of the middle section are inserted with plastic pieces (102), the plastic pieces (102) are provided with gear shaping (103) sleeved with the wiping object, one end of the gear shaping (103) can be folded towards the wiping surface, and a fastening piece (104) capable of avoiding folding is arranged.