CN113858860A

CN113858860A - Blackboard with eraser cleaning function

Info

Publication number: CN113858860A
Application number: CN202111235648.3A
Authority: CN
Inventors: 何玉良; 李明涛; 刘少璞; 李子宽; 刘小飞
Original assignee: Shijiazhuang Keda Education Equipment Co ltd
Current assignee: Shijiazhuang Keda Education Equipment Co ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2021-12-31
Anticipated expiration: 2041-10-22
Also published as: CN113858860B

Abstract

The invention provides a blackboard with an eraser cleaning function, and relates to the technical field of blackboard teaching aids, which comprises a blackboard body, a water collecting box, a water filtering box, a water spraying piece and an extrusion piece, wherein one side of the blackboard body is provided with an installation part, and the installation part is provided with an installation cavity; the water collecting box is arranged at the bottom of the mounting cavity; the water filtering box is arranged in the water collecting box; the water spraying piece is arranged at the bottom of the water collecting box; the extruded part is arranged at the top of the installation cavity. According to the blackboard with the eraser cleaning function, the installation part is provided with the installation cavity, the water collecting box and the water filtering box are arranged in the installation cavity, cleaning water is sprayed to the bottom of the eraser through the water spraying piece, the eraser discharges dust in the eraser under the extrusion action of the extrusion piece by using water, sewage falls into the water collecting box through the filtering holes of the water filtering box, the eraser cleaning efficiency is improved, the eraser cleaning quality is ensured, the installation part is positioned on the side part of the blackboard body, the eraser is convenient to clean and the using state is convenient to switch rapidly, and the blackboard eraser cleaning device has good use convenience.

Description

Blackboard with eraser cleaning function

Technical Field

The invention belongs to the technical field of blackboard teaching aids, and particularly relates to a blackboard with an eraser cleaning function.

Background

The blackboard and the eraser are teaching tools commonly used by teachers and other people. In teaching work, a teacher writes characters on a blackboard through chalk, and erases the characters through an eraser. In the process of erasing the blackboard, chalk dust can be adhered to the blackboard eraser to influence the erasing of subsequent fonts.

In the prior art, after the blackboard eraser is used for a period of time, a user soaks the blackboard eraser in clear water, then extrudes the blackboard eraser, and brings out dust in the blackboard eraser by utilizing the clear water, so that the subsequent blackboard is conveniently erased. However, the operation is time-consuming and labor-consuming, sewage is easy to spill, the cleaning effect is poor, and the cleanliness of the blackboard eraser is affected.

Disclosure of Invention

The invention aims to provide a blackboard with an eraser cleaning function, which can conveniently clean an eraser during writing, improve the convenience of erasing the blackboard and ensure the cleanness of erasing the blackboard.

In order to achieve the purpose, the invention adopts the technical scheme that: provided is a blackboard with an eraser cleaning function, including:

the blackboard comprises a blackboard body, wherein one side of the blackboard body is provided with an installation part, and an installation cavity with an outward opening is arranged on the installation part;

the water collecting box is arranged at the bottom of the installation cavity;

the water filtering box is arranged in the water collecting box and is used for supporting the eraser, and filter holes which are communicated up and down are formed in the water filtering box;

the water spraying piece is arranged at the bottom of the water collecting box, is positioned below the water filtering box and is used for spraying water to the blackboard eraser;

the extruded piece sets up in the top of installation cavity for lower pressure board eraser is in order to extrude sewage.

In one possible implementation, the sprinkler includes:

a water supply pipe penetrating the side wall of the water collecting box;

the spray nozzle is arranged with the water spray opening upwards and corresponds to the filtering hole up and down.

In a possible implementation mode, the upper edge of the water filtering box is provided with a hanging part which is bent outwards to hang the upper edge of the water collecting box, a stress column which extends upwards to bear the bottom surface of the water filtering box is arranged in the water collecting box, the upper end of the stress column is provided with an extension part extending towards the periphery, and the top surface of the extension part is attached to the bottom surface of the water filtering box.

In some embodiments, the extrusion comprises:

the fixed end of the lifting arm is connected to the inner top surface of the mounting cavity, and the telescopic end extends downwards;

and the extrusion plate is connected to the telescopic end of the lifting arm and is used for being abutted against the top surface of the blackboard eraser so as to extrude the blackboard eraser.

In some embodiments, the bottom surface of the pressing plate is provided with a limiting ring protruding downwards, and the limiting ring is used for being annularly arranged on the periphery of the top of the blackboard eraser to limit the blackboard eraser.

In a possible implementation mode, still articulated on the installation department have the open-close door that is used for the shutoff installation cavity, open-close door and keep away from still to be equipped with the locking subassembly between one side of pin joint and the installation department, the locking subassembly includes:

the locking seat is arranged on the mounting part and is provided with a clamping groove which penetrates through the mounting part up and down;

one end of the locking strip is rotatably connected to the opening and closing door and can swing in a vertical plane, and the other end of the locking strip is provided with a clamping pin suitable for being clamped in the clamping groove.

In a possible implementation manner, the filtering holes are respectively arranged on the bottom wall and the peripheral wall of the water filtering box and are long round holes.

In some embodiments, criss-cross reinforcing ribs are arranged on the inner bottom surface of the water filtering box.

In some embodiments, the bottom surface of the water filtering box is further provided with a water drainage groove, the water drainage groove is arranged close to the peripheral wall of the water filtering box, the water drainage groove is also internally provided with a filtering hole, and the reinforcing rib is positioned on the inner ring of the water drainage groove.

In a possible implementation mode, a plurality of auxiliary spray heads which are arranged towards the center of the water filtering box and used for spraying the peripheral wall of the blackboard eraser are further arranged above the water filtering box, and the auxiliary spray heads are obliquely arranged towards one side close to the blackboard eraser from top to bottom.

The scheme shown in the embodiment of the application, compared with the prior art, the scheme shown in the embodiment of the application, be equipped with the installation cavity on the installation department of blackboard body lateral part, water collection box and drainage box set up in the installation cavity, spray clean water to the blackboard eraser bottom through the water spray piece, the blackboard eraser is under the extrusion of extruded article, utilize water to discharge the dust in the blackboard eraser, sewage drops to in the water collection box through the filtration pore of water filtration box, the cleaning efficiency of blackboard eraser has been improved, the cleaning quality of blackboard eraser has been guaranteed, the installation department is located the lateral part of blackboard body, be convenient for carry out the washing of blackboard eraser and the fast switch-over of user state, good convenience in use has.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a blackboard with an eraser cleaning function according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of the blackboard with an eraser cleaning function in FIG. 1 with the opening/closing door removed according to the embodiment of the present invention;

FIG. 3 is a schematic diagram of a partial enlarged structure of FIG. 2;

FIG. 4 is a schematic top view of the water-filtering box of FIG. 2 according to the embodiment of the present invention;

FIG. 5 is a schematic partial sectional view of A-A in FIG. 2 according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

1. a blackboard body; 11. an installation part; 12. a mounting cavity; 2. a water collection box; 21. a stress column; 22. an expansion section; 3. a water filtering box; 31. a hanging part; 32. reinforcing ribs; 33. filtering holes; 34. a water discharge tank; 4. a water spraying member; 41. a water supply pipe; 42. a spray head; 43. a secondary spray head; 5. an extrusion; 51. a lifting arm; 52. a pressing plate; 53. a limiting ring; 6. opening and closing the door; 71. a locking bar; 72. a locking seat; 8. an eraser.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or be indirectly on the other element. It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular operation, and are therefore not to be considered limiting. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or several of that feature. In the description of the present invention, "a number" means two or more unless specifically limited otherwise.

Referring to fig. 1 to 5, a blackboard with a cleaning function of the eraser according to the present invention will now be described. The blackboard with the blackboard eraser cleaning function comprises a blackboard body 1, a water collecting box 2, a water filtering box 3, a water spraying piece 4 and an extrusion piece 5, wherein one side of the blackboard body 1 is provided with an installation part 11, and the installation part 11 is provided with an installation cavity 12 with an outward opening; the water collecting box 2 is arranged at the bottom of the mounting cavity 12; the water filtering box 3 is arranged in the water collecting box 2 and is used for supporting the eraser 8, and the water filtering box 3 is provided with filtering holes 33 which are communicated up and down; the water spraying piece 4 is arranged at the bottom of the water collecting box 2, is positioned below the water filtering box 3 and is used for spraying water to the blackboard eraser 8; the pressing member 5 is provided on the top of the mounting chamber 12 for pressing down the eraser 8.

Compared with the prior art, the blackboard with the eraser cleaning function provided by the embodiment has the advantages that the installation cavity 12 is arranged on the installation part 11 at the side part of the blackboard body 1, the water collecting box 2 and the water filtering box 3 are arranged in the installation cavity 12, the cleaning water is sprayed to the bottom of the eraser 8 through the water spraying piece 4, the sponge at the bottom of the eraser 8 absorbs the cleaning water, under the extrusion effect of the extrusion piece 5, dust in the eraser 8 is discharged by water, sewage falls into the water collecting box 2 through the filtering holes 33 of the water filtering box 3, the cleaning efficiency of the eraser 8 is improved, the cleaning quality of the eraser 8 is ensured, the mounting part 11 is positioned on the side part of the blackboard body 1, a writer can clean the eraser 8 conveniently according to the use condition of the eraser 8, the cleaning state and the use state of the eraser 8 can be switched rapidly, and the eraser 8 cleaning device has good use convenience.

In some possible implementations, the above-mentioned features of the sprinkler 4 are structured as shown in fig. 2 and 5. Referring to fig. 2 and 5, the water spray 4 includes a water supply pipe 41 and a spray head 42, the water supply pipe 41 being disposed through a sidewall of the sump case 2; the water jet of the nozzle 42 is arranged upward and corresponds to the filtering holes 33 up and down.

The water spray member 4 is used for spraying cleaning water from the eraser 8 above the water filter box 3 to realize the cleaning of the eraser 8. Clean water is supplied into the head 42 through the water supply pipe 41, and the water supply pipe 41 is provided with a valve for controlling the supply of water. The tip of delivery pipe 41 runs through the lateral wall of installation cavity 12 and the lateral wall of catchment box 2 and extends to the bottom surface of drainage box 3, and the water jet of shower nozzle 42 upwards sets up, and corresponds from top to bottom with filtration pore 33, and the bottom of blackboard eraser 8 is spouted to the water of being convenient for from bottom to top, makes the sponge of blackboard eraser 8 bottom can adsorb more water, and under extrusion 5's squeezing action, water can carry the dust formation sewage in the blackboard eraser 8, and sewage flows to in the catchment box 2 from filtration pore 33.

Specifically, the size of the filter hole 33 is properly increased, so that both the upward-sprayed clean water and the downward-flowing sewage can flow orderly in a required direction, the problem that the spraying is not in place or the sewage discharge is not smooth due to too small water passing area is avoided, and the cleaning efficiency of the eraser 8 is effectively improved.

In some possible implementations, the above-described characteristic cartridge 3 is structured as shown in fig. 3 and 4. Referring to fig. 3 and 4, the upper edge of the water filtering box 3 is provided with a hanging part 31 which is bent outwards to hang the upper edge of the water collecting box 2, a stress column 21 which extends upwards to support the bottom surface of the water filtering box 3 is arranged in the water collecting box 2, the upper end of the stress column 21 is provided with an extension part 22 which extends towards the periphery, and the top surface of the extension part 22 is attached to the bottom surface of the water filtering box 3.

The water filtering box 3 is arranged in the water collecting box 2, a certain distance is arranged between the outer bottom surface of the water filtering box 3 and the inner bottom surface of the water collecting box 2, and the space is used for containing sewage flowing down in the upper water filtering box 3. A hanging part 31 is provided on the upper edge of the water filtration box 3, the hanging part 31 extends in the outer circumferential direction, and the water filtration box 3 is hung on the upper edge of the water collection box 2 via the hanging part 31.

The water collecting box 2 is further provided with a force-receiving column 21 at the bottom thereof, in addition to the attachment of the water filtering box 3 by the hanging portion 31. The sectional area of the expansion part 22 at the upper end of the stress column 21 is gradually increased from bottom to top, and the large-area top surface of the upper part of the stress column can be in large-area contact with the water filtering box 3, so that the effective bearing of the water filtering box 3 is realized.

The water filtering box 3 can keep the stability of the position of the water filtering box 2 by means of the comprehensive action of the hanging part 31 and the lower stress column 21, and even if the blackboard eraser 8 is extruded by the extrusion part 5, the water collecting box 2 can not generate overlarge deformation and has good bearing capacity for the blackboard eraser 8.

In some possible implementations, the above-described feature extrusion 5 takes the configuration shown in fig. 2 and 5. Referring to fig. 2 and 5, the pressing member 5 includes a lifting arm 51 and a pressing plate 52, and a fixed end of the lifting arm 51 is connected to an inner top surface of the mounting chamber 12; the pressing plate 52 is connected to the telescopic end of the lifting arm 51 and is used for abutting against the top surface of the blackboard eraser 8 so as to press the blackboard 52 eraser.

The pressing member 5 is used for pressing the board 52 wiper downwards, so that the sponge of the board wiper 8 is pressed and compressed, and the dust in the sponge is taken out by water. The lifting arm 51 is provided with a telescopic end, the telescopic end can drive the extrusion plate 52 to move downwards under the telescopic action of the lifting arm 51, the top surface of the extrusion plate 52 wiper realizes the extrusion action on the board wiper 8, so that the water in the sponge carries the powder to form sewage, and flows into the water collecting box 2 through the filtering holes 33 of the water filtering box 3.

Specifically, the extrusion arm can adopt pneumatic cylinder, lead screw or rack and pinion subassembly to go up and down the action, and the flexible drive of lifing arm 51 can reduce artifical extruded intensity of labour, has guaranteed the dynamics and the frequency of extrusion action, realizes the effective emission of the inside sewage of sponge. Above-mentioned cleaning method, traditional relatively soaks 8 the blackboard erasers in same container many times and absorbs water and the mode of extrusion, can effectively improve abluent cleanliness factor, has avoided the not thorough problem of washing.

In some embodiments, the feature pressing plate 52 may be configured as shown in fig. 3 and 5. Referring to fig. 3 and 5, a limiting ring 53 protruding downwards is arranged on the bottom surface of the pressing plate 52, and the limiting ring 53 is arranged around the top periphery of the eraser 8 to limit the eraser 8.

The pressing plate 52 is further provided with a limiting ring 53 protruding downwards for limiting the periphery of the top of the eraser 8. When the extrusion plate 52 presses the blackboard eraser 8 under the driving of the lifting arm 51, the blackboard eraser 8 is limited in the limiting ring 53 and is stably positioned at the same horizontal position, the horizontal displacement generated by the uneven pressure action of the extrusion plate 52 on each point of the top surface of the blackboard eraser 8 is avoided, the bottom surface of the extrusion plate 52 is ensured to be fully contacted with the top surface of the blackboard eraser 8, the sponge part is comprehensively extruded, the uniform distribution of extrusion load is effectively improved, the sponge at the bottom of the blackboard eraser 8 is ensured to be fully and effectively cleaned, the cleaning cleanliness is improved, and the subsequent normal use of the blackboard eraser 8 is ensured.

The longitudinal section of the limiting ring 53 is a right trapezoid, wherein the oblique side of the right trapezoid is close to the inner side of the limiting ring 53, when the extrusion plate 52 moves downwards, the eraser 8 can be guided to the middle of the limiting ring 53, the limiting effect of the limiting ring 53 on the eraser 8 is ensured, and the stability of the relative position of the components in the cleaning process of the eraser 8 is ensured.

In some possible implementations, the feature mounting portion 11 is configured as shown in fig. 1. Referring to fig. 1, an opening and closing door 6 for plugging an opening of the installation cavity 12 is further hinged to the installation portion 11, a locking assembly is further arranged between one side, away from a hinge point, of the opening and closing door 6 and the installation portion 11, the locking assembly comprises a locking seat 72 and a locking strip 71, and the locking seat 72 is arranged on the installation portion 11 and is provided with a vertically-penetrating clamping groove; one end of the locking strip 71 is rotatably connected to the opening and closing door 6 and can swing in a vertical plane, and the other end of the locking strip is provided with a clamping pin suitable for being clamped in the clamping groove.

The opening and closing door 6 on the mounting part 11 is used for plugging a front side opening of the mounting cavity 12, and the opening and closing door 6 is rotatably connected to the front side surface of the mounting part 11, so that the opening and closing can be conveniently realized. The locking assembly can keep the opening and closing door 6 in a closed state. In the process of wiping the blackboard body 1 by using the eraser 8, the opening and closing door 6 is in a closed state, and at the moment, the locking strip 71 can rotate to the position where the clamping pin and the clamping groove are clamped with each other, so that the stability of the relative position between the locking seat 72 and the locking strip 71 is kept.

Furthermore, charts such as a curriculum schedule or a class schedule can be pasted on the opening and closing door 6, so that the effective utilization of space can be realized, and the overall aesthetic property and the practicability of the blackboard are improved.

The locking bar 71 can swing freely in the vertical plane, and then the position of the clamping pin is changed, so that the clamping pin enters the clamping groove or is separated from the clamping groove. When locking is needed, the locking strip 71 is rotated to enable the clamping pin at the end part of the locking strip to be clamped in the clamping groove of the locking seat 72, and the opening and closing door 6 is ensured to be in a closed state.

In some possible implementations, the characteristic filter holes 33 are configured as shown in fig. 4. Referring to fig. 4, a plurality of filtering holes 33 are respectively formed in the bottom wall and the peripheral wall of the water filtering box 3, and the filtering holes 33 are oblong holes.

In order to improve the drainage efficiency of the filter holes 33, the filter holes 33 are provided in the form of oblong holes. The long axis direction of the long round hole has a larger degree, and the drainage efficiency can be effectively improved. Compare circular shape filtration pore 33, can effectively increase drainage area, guarantee the quick discharge of sewage.

In some embodiments, the above-described characteristic cartridge 3 can adopt the structure shown in fig. 3 and 4. Referring to fig. 3 and 4, the bottom surface of the filter box 3 is further provided with a drainage groove 34, the drainage groove 34 is arranged close to the peripheral wall of the filter box 3, the drainage groove 34 is also provided with a filter hole 33, and the reinforcing rib 32 is positioned at the inner ring of the drainage groove 34.

The position that is close to the neighboring on the bottom surface of drainage box 3 has set up undercut's water drainage tank 34, and water drainage tank 34 highly is less than the bottom surface height of drainage box 3, can realize effectively gathering of sewage, avoids sewage to extrude the back and discharge the rebreathing that in time caused from the sponge, has guaranteed the abluent cleanliness factor of blackboard eraser 8.

Further, the filtration holes 33 are also provided in the peripheral wall of the water filtration cartridge 3, and the filtration holes 33 in the peripheral wall are provided close to the drain grooves 34, whereby the drainage rate can be further increased. On this basis, in order to avoid the arrangement of the filter holes 33 from influencing the structural strength of the water filtering box 3, reinforcing ribs 32 which are perpendicular to the direction of the filter holes 33 can be arranged to enhance the structural strength of the water filtering box 3.

In some embodiments, the above-described characteristic cartridge 3 may be configured as shown in fig. 4. Referring to fig. 4, criss-cross reinforcing ribs 32 are provided on the inner bottom surface of the water filtration box 3.

Set up the strengthening rib 32 that can strengthen water filtering box 3 bottom structural strength on water filtering box 3's the interior bottom surface, avoid the blackboard eraser 8 to receive the extrusion and give water filtering box 3 with power transmission, produce the destruction to water filtering box 3. The reinforcing ribs 32 are arranged in a criss-cross mode, so that filter holes 33 are formed in the area surrounded by the reinforcing ribs 32 in the longitudinal direction and the transverse direction, and effective discharge of sewage is guaranteed.

As a parallel example, if there are no filter holes 33 in the region surrounded by the longitudinal and lateral ribs 32, it is necessary to provide the ribs 32 with communication ports that penetrate inside and outside, so that the region surrounded by the ribs and the filter holes 33 can be effectively communicated with each other, and good drainage performance can be ensured.

Referring to fig. 2 and 5, on the basis of spraying water to the sponge by the water spraying member 4, a plurality of auxiliary nozzles 43 which are arranged toward the center of the water filtering box 3 to spray the circumferential wall of the eraser 8 are further arranged above the water filtering box 3, and the auxiliary nozzles 43 are obliquely arranged from top to bottom to one side close to the eraser 8.

The spray head 42 above the water filtering box 3 is used for spraying to the periphery of the wiping cloth of the board eraser 8, the spray head 42 is arranged from outside to inside in a downward inclined mode, the periphery of the board eraser 8, particularly the lower portion of the wiping cloth, can be sprayed and brushed in a centralized mode to form a good flushing effect, and by combining the extrusion effect of the extrusion piece 5, the sponge at the lower portion of the board eraser 8 is better cleaned, the problem that cleaning is not thorough due to insufficient water supply of the water spraying piece 4 is avoided, and the cleanliness is improved.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Blackboard with blackboard eraser cleaning function, its characterized in that includes:

the water collecting box is arranged at the bottom of the installation cavity;

and the extrusion part is arranged at the top of the installation cavity and used for pressing the blackboard eraser down to extrude sewage.

2. The blackboard with an eraser cleaning function according to claim 1, wherein said water jet member comprises:

a water supply pipe penetrating the side wall of the water collecting box;

and the spray nozzle is upwards arranged and corresponds to the filtering hole up and down.

3. The blackboard with the eraser cleaning function according to claim 1, wherein the upper edge of the water filtering box is provided with a hanging part which is bent outward to hang on the upper edge of the water collecting box, a stress column which extends upward to support the bottom surface of the water filtering box is arranged in the water collecting box, the upper end of the stress column is provided with an extension part which extends toward the periphery, and the top surface of the extension part is attached to the bottom surface of the water filtering box.

4. A blackboard with an eraser purge function according to claim 1, wherein said extrusion comprises:

the fixed end of the lifting arm is connected to the inner top surface of the mounting cavity, and the telescopic end of the lifting arm extends downwards;

and the extrusion plate is connected to the telescopic end of the lifting arm and is used for being abutted against the top surface of the blackboard eraser to extrude the blackboard eraser.

5. The blackboard with the eraser cleaning function according to claim 4, wherein the bottom surface of the pressing plate is provided with a downwardly convex limiting ring for surrounding the periphery of the top of the eraser to limit the eraser.

6. The blackboard with the eraser cleaning function according to claim 1, wherein the mounting portion is further hinged with an opening and closing door for plugging the opening of the mounting cavity, a locking assembly is further arranged between one side of the opening and closing door away from the hinge point and the mounting portion, and the locking assembly comprises:

and one end of the locking strip is rotatably connected to the opening and closing door and can swing in a vertical plane, and the other end of the locking strip is provided with a clamping pin which is suitable for being clamped in the clamping groove.

7. The blackboard with the eraser cleaning function as claimed in any one of claims 1 to 6, wherein said filtering holes are respectively provided in number on the bottom wall and the peripheral wall of said water filtering case, said filtering holes being oblong holes.

8. The blackboard with the eraser cleaning function according to claim 7, wherein criss-cross reinforcing ribs are provided on the inner bottom surface of the water filtering box.

9. The blackboard with the eraser cleaning function as claimed in claim 8, wherein the bottom surface of said water filtering box is further provided with a water drainage groove, said water drainage groove is provided near the peripheral wall of said water filtering box, said water drainage groove is also provided with said filtering holes therein, and said reinforcing rib is provided at the inner ring of said water drainage groove.

10. The blackboard with the eraser cleaning function as claimed in any one of claims 1 to 6, wherein a plurality of sub-nozzles are further provided above the water-filtering box toward the center of the water-filtering box to spray the peripheral wall of the eraser, the sub-nozzles being inclined from top to bottom toward the side near the eraser.