CN109532293A - A kind of self-dust absorption type environment-friendly dust-proof eraser - Google Patents
A kind of self-dust absorption type environment-friendly dust-proof eraser Download PDFInfo
- Publication number
- CN109532293A CN109532293A CN201811562082.3A CN201811562082A CN109532293A CN 109532293 A CN109532293 A CN 109532293A CN 201811562082 A CN201811562082 A CN 201811562082A CN 109532293 A CN109532293 A CN 109532293A
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- Prior art keywords
- dust
- self
- compartment
- absorption type
- shell
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L21/00—Blackboard or slate cleaning devices
- B43L21/02—Blackboard or slate cleaning devices with means for absorbing the chalk dust
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L21/00—Blackboard or slate cleaning devices
- B43L21/04—Wiper holders
Abstract
The invention discloses a kind of self-dust absorption type environment-friendly dust-proof erasers, including shell, rear cover and rub piece, the shell is internally provided with dust compartment, the dust compartment is internally provided with aqueous cotton, and the front end of dust compartment is provided with entering-dust mouth, air outlet is provided on the outside of the dust compartment, and the outer end of air outlet is provided with suction opening baffle, ventilation opening is provided on the outside of the air outlet, and flabellum is provided on the inside of ventilation opening, the rub piece is located at the front end of shell, and the side of rub piece is provided with wiping cylinder, the outer end side surface of the wiping cylinder is provided with transmission gear, the side rear of the wiping cylinder is provided with combing scraper plate.The self-dust absorption type environment-friendly dust-proof eraser is provided with flabellum and dust compartment, cooperation driving gear, transmission gear and transmission belt use in the use process of device, it can be in order to drive flabellum autorotation while wiping cylinder carries out wiping rolling, it is quickly flowed by air-flow and forms negative pressure, to be drawn to chalk dust.
Description
Technical field
The present invention relates to education and instruction correlative technology field, specially a kind of self-dust absorption type environment-friendly dust-proof eraser.
Background technique
During education and instruction, the flexibility of traditional instruction and convenience make many teachers in teaching process all
Habit carries out writing and teaching with chalk on blackboard, and letter written with chalk needs to wipe and clean using blackboard eraser after writing, but
It is that existing most of ordinary blackboard erasers are easy to cause dust to wave during erasing the board, is not only not easy to sweep, also to teacher
Raw health has very big threat.
So many blackboard erasers all start to focus on the dust suction dust reduction capability of blackboard eraser, such as China specially in present blackboard eraser
Benefit number is the dust absorption blackboard eraser of CN201010617681.8, mainly passes through the setting components such as absorbing cavity and aspiration pump on blackboard eraser
Realize dust suction effect of blackboard eraser, and in actual use, the aspiration pump of the structure is not only not easy to install, but also needs
Additional power source is wanted, manufactures and is inconvenient,
Also the anti-fugitive dust blackboard eraser of a kind of portable for being CN201711194962.5 just like China Patent No., passes through built-in metal
Strainer and extraction fan form negative pressure gas flow and draw to dust, and in actual use, metal screen and pumping
Fan part is easy to accumulate a large amount of dust, and is not easily cleaned, and influences continuing through for air-flow, brings not to the use of device
Just.
In view of the above-mentioned problems, carrying out innovative design on the basis of original blackboard eraser.
Summary of the invention
The purpose of the present invention is to provide a kind of self-dust absorption type environment-friendly dust-proof erasers, black to solve to propose in above-mentioned background technique
Not the problem of blackboard eraser does not have dust-absorbing function, be easy to cause dust from flying.
To achieve the above object, the invention provides the following technical scheme: a kind of self-dust absorption type environment-friendly dust-proof eraser, including shell
And rub piece, the shell is internally provided with dust compartment, and the rear of dust compartment is provided with rear cover, the inside setting of the rear cover
There is gasket, and be provided with fixing buckle on the outside of rear cover, the dust compartment is internally provided with aqueous cotton, and before dust compartment
End is provided with entering-dust mouth, air outlet is provided on the outside of the dust compartment, and the outer end of air outlet is provided with suction opening baffle, institute
It states and is provided with ventilation opening on the outside of air outlet, and be provided with flabellum on the inside of ventilation opening, and be provided with activity on the inside of flabellum
Convex block, the rub piece is located at the front end of shell, and the side of rub piece is provided with wiping cylinder, the rear setting of the wiping cylinder
There is rubber friction block, and the outer end side surface of wiping cylinder is provided with transmission gear, and the side of transmission gear is provided with transmission
Band, the side rear of the wiping cylinder are provided with combing scraper plate, and the front end for combing scraper plate is provided with through slot, the shell it is outer
Side is provided with velcro, and outer dust-proof cloth is provided on the outside of velcro.
Preferably, the dust compartment and shell are integrated, and gasket is provided between dust compartment and rear cover, and
And rear cover is connected with the rear side object hinge of dust compartment, while being connected with each other between the front end and shell of rear cover by fixing buckle.
Preferably, the suction opening baffle includes dust-filtering plate, elastic washer and fixed card slot, and suction opening baffle is located at
Between air outlet and flabellum, and the two sides up and down of dust compartment are provided with air outlet.
Preferably, elastic washer, and the outer middle side part of dust-filtering plate are provided between the inside and air outlet of the dust filtration plate
It is provided with fixed card slot, and fixed card slot and movable convex block are bonded to each other.
Preferably, the flabellum is provided with 2, and flabellum is between air outlet and ventilation opening, and flabellum and transmission
It is connected with each other between gear by transmission belt.
Preferably, the wiping cylinder includes movable roll, movable axis, pile layer and drives gear, and wiping cylinder
The floor height of bottom end height and rub piece is equal.
Preferably, the movable axis and movable roll are integrated, and pass through driving between movable axis and transmission gear
Gear constitutes engagement connection, and drives the transmission ratio of gear and transmission gear less than 0.5.
Preferably, the pile layer is evenly distributed on the outside of movable roll, and the rear of pile layer and rubber friction block are mutual
Fitting.
Preferably, the combing scraper plate is between entering-dust mouth and wiping cylinder, and the front end for combing scraper plate is uniformly distributed
There is through slot, and combs and be bonded to each other between the front end of scraper plate and wiping cylinder.
Preferably, the outer dust-proof cloth is evenly distributed on hull outside, and passes through evil spirit between outer dust-proof cloth and shell
Art patch is connected with each other, and the width of outer dust-proof cloth is equal to the thickness of shell.
Compared with prior art, the beneficial effects of the present invention are: the self-dust absorption type environment-friendly dust-proof eraser;
1, be provided with can synchronous self rotation flabellum and dust compartment, in the use process of device cooperation driving gear, transmission
Gear and transmission belt use, can in order to carry out driving flabellum autorotation while wiping rolls in wiping cylinder, without
Additional power-driven gear, while the transmission of gear cooperation transmission gear is driven, to the rotation of flabellum, there are also accelerations, just
It drives air-flow quickly to flow in the current path that cooperation entering-dust mouth, air outlet and ventilation opening are formed, forms negative pressure in dust compartment,
To draw to chalk dust, and the aqueous cotton in dust compartment can be in order to the attachment of dust, consequently facilitating the suction of device
Dirt is collected;
2, be provided with can carry out cooperation rolling wiping cylinder, in the use process of device, wiping cylinder can device into
Play the role of rolling wiping during row wiping, cooperation rub piece can carry out dual erasing to letter written with chalk, and can drive
Dust is mobile to the entering-dust mouth in the middle part of device, cooperates outer dust-proof cloth that can prevent the outside loss of dust, while on wiping cylinder
Pile layer compound rubber friction block use, can make to generate in pile layer in the course of rotation into electrostatic, convenient for by quiet
Electro Sorb improves wiping cylinder to the wiping adsorption effect of chalk dust, and the combing scraper plate of wiping cylinder side can also be to lint
Layer is combed, and prevents dust accumulation from influencing the wiping pick-up performance of device;
3, it is provided with mobilizable suction opening baffle, cooperates dust-filtering plate to use in the use process of device, it can be convenient for dress
While setting interior formation current path, prevent part dust from excluding with air-flow, and the elastic washer on the inside of dust-filtering plate makes it have
Certain elastic mobility, cooperation fixed card slot and movable convex block use, and can drive dust filtering during flabellum rotates
Plate carries out certain shake, makes the part dust releasing adhered on dust-filtering plate, to prevent from adhering to a large amount of dust shadow on dust-filtering plate
The circulation for ringing air-flow, improves the practicability of device.
Detailed description of the invention
Fig. 1 is present invention looks up structural representation of the present invention;
Fig. 2 is side, sectional structural schematic diagram at A-A in Fig. 1 of the present invention;
Fig. 3 is enlarged structure schematic diagram at a in Fig. 2 of the present invention;
Fig. 4 is side, sectional structural schematic diagram at B-B in Fig. 1 of the present invention;
Fig. 5 is enlarged structure schematic diagram at b in Fig. 4 of the present invention;
Fig. 6 is that gas of the present invention looks up the schematic diagram of the section structure;
Fig. 7 is enlarged structure schematic diagram at c in Fig. 6 of the present invention;
Fig. 8 is overlooking structure diagram of the present invention.
In figure: 1, shell;2, dust compartment;3, rear cover;4, gasket;5, fixing buckle;6, aqueous cotton;7, entering-dust mouth;8,
Air outlet;9, suction opening baffle;901, dust-filtering plate;902, elastic washer;903, fixed card slot;10, ventilation opening;11, flabellum;
12, movable convex block;13, rub piece;14, wiping cylinder;1401, movable roll;1402, movable axis;1403, pile layer;1404, it drives
Gear;15, rubber friction block;16, transmission gear;17, transmission belt;18, scraper plate is combed;19, through slot;20, velcro;21, outer
Dust-proof cloth.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-8 is please referred to, the present invention provides a kind of technical solution: a kind of self-dust absorption type environment-friendly dust-proof eraser, including shell 1,
Dust compartment 2, rear cover 3, gasket 4, fixing buckle 5, aqueous cotton 6, entering-dust mouth 7, air outlet 8, suction opening baffle 9, ventilation opening 10,
Flabellum 11, movable convex block 12, rub piece 13, wiping cylinder 14, rubber friction block 15, transmission gear 16, transmission belt 17, combing scraper plate
18, through slot 19, velcro 20 and outer dust-proof cloth 21, shell 1 are internally provided with dust compartment 2, and the rear setting of dust compartment 2
There is rear cover 3, the inside of rear cover 3 is provided with gasket 4, and the outside of rear cover 3 is provided with fixing buckle 5, the inside setting of dust compartment 2
There is aqueous cotton 6, and the front end of dust compartment 2 is provided with entering-dust mouth 7, the outside of dust compartment 2 is provided with air outlet 8, and air outlet 8
Outer end be provided with suction opening baffle 9, the outside of air outlet 8 is provided with ventilation opening 10, and the inside of ventilation opening 10 is provided with fan
Leaf 11, and the inside of flabellum 11 is provided with movable convex block 12, and rub piece 13 is located at the front end of shell 1, and the side of rub piece 13 is set
It is equipped with wiping cylinder 14, the rear of wiping cylinder 14 is provided with rubber friction block 15, and the outer end side surface setting of wiping cylinder 14
There is transmission gear 16, and the side of transmission gear 16 is provided with transmission belt 17, the side rear of wiping cylinder 14 is provided with combing
Scraper plate 18, and the front end for combing scraper plate 18 is provided with through slot 19, the outside of shell 1 are provided with velcro 20, and velcro 20
Outside is provided with outer dust-proof cloth 21.
The dust compartment 2 and shell 1 of this example are integrated, and gasket 4 is provided between dust compartment 2 and rear cover 3, and
And rear cover 3 is connected with the rear side object hinge of dust compartment 2, while being interconnected between the front end of rear cover 3 and shell 1 by 5 phase of fixing buckle
It connects, constitutes a closed dust memory space convenient for side in the device, mobilizable rear cover 3 is clear convenient for the inside of dust compartment 2
Reason, while the aqueous cotton 6 in dust compartment 2 can play suction-operated to dust, loss occurs for the dust in anti-locking apparatus.
Suction opening baffle 9 includes dust-filtering plate 901, elastic washer 902 and fixed card slot 903, and suction opening baffle 9 is located at
Between air outlet 8 and flabellum 11, and the two sides up and down of dust compartment 2 are provided with air outlet 8, convenient for 2 interior air-flow of dust compartment
Circulation, it is convenient to drive dust to enter inside device by air-flow.
Elastic washer 902 is provided between the inside and air outlet 8 of dust-filtering plate 901, and the outer middle side part of dust-filtering plate 901 is set
It is equipped with fixed card slot 903, and fixed card slot 903 and movable convex block 12 are bonded to each other, dust-filtering plate 901 can be in anti-locking apparatus
It, can be in movable convex block 12 with flabellum by the fitting of fixed card slot 903 and movable convex block 12 while dust is discharged with air-flow
11 drive dust-filtering plate 901 to carry out certain shake while rotation, prevent from accumulating more dust on dust-filtering plate 901, influence
Air-flow passes through.
Flabellum 11 is provided with 2, and flabellum 11 is between air outlet 8 and ventilation opening 10, and flabellum 11 and driving cog
It is connected with each other between wheel 16 by transmission belt 17, convenient for quickly being flowed outward by the air-flow in the rotation driving device of flabellum 11
It is dynamic, to form negative pressure in dust compartment 2, dust is driven to enter inside device.
Wiping cylinder 14 includes movable roll 1401, movable axis 1402, pile layer 1403 and driving gear 1404, and is wiped
The bottom end height of roller 14 and the floor height of rub piece 13 are equal, convenient for passing through the sliding of the rolling of wiping cylinder 14 and rub piece 13
Blackboard is thoroughly cleared up.
Movable axis 1402 and movable roll 1401 are integrated, and pass through drive between movable axis 1402 and transmission gear 16
Moving gear 1404 constitutes engagement connection, and drives the transmission ratio of gear 1404 and transmission gear 16 less than 0.5, convenient for passing through work
The rolling of dynamic roller 1401 generates driving force to transmission gear 16 simultaneously, to drive flabellum 11 to synchronize rotation, while larger
Driving gear 1404 lesser transmission gear 16 and flabellum 11 can be driven quickly to be rotated.
Preferably, pile layer 1403 is evenly distributed on 1401 outside of movable roll, and the rear of pile layer 1403 and rubber rub
Cleaning block 15 is bonded to each other, and is produced convenient for the friction when movable roll 1401 is rotated through pile layer 1403 and rubber friction block 15
Raw electrostatic improves the cleaning and dust suction of device so that pile layer 1403 be allow to play certain Electrostatic Absorption effect to dust
Effect.
Comb scraper plate 18 positioned at entering-dust mouth 7 and wiping cylinder 14 between, and combing scraper plate 18 front end be evenly distributed with it is logical
Slot 19, and comb and be bonded to each other between the front end of scraper plate 18 and wiping cylinder 14, convenient for passing through the 18 pairs of wiping rollings of combing scraper plate
The lint material of cylinder 14 is combed, and the dust adhered on wiping cylinder 14 is scraped, and prevents from being stained on wiping cylinder 14 excessive
Dust influence device cleaning effect.
Outer dust-proof cloth 21 is evenly distributed on 1 outside of shell, and passes through velcro 20 between outer dust-proof cloth 21 and shell 1
It is connected with each other, and the width of outer dust-proof cloth 21 is equal to the thickness of shell 1, can prevent user by outer dust-proof cloth 21
The direct dust exposure of hand, plays a certain protective role the hand of user, while outer dust-proof cloth 21 can certain journey
Degree reduces the loss of dust, and can be convenient for disassembly cleaning by the outer dust-proof cloth 21 that velcro 20 connects.
Working principle: when using the self-dust absorption type environment-friendly dust-proof eraser, according to Fig. 3-5, fixation can be opened first
Button 5, then Unscrew rear cover 3, takes out the aqueous cotton 6 in dust compartment 2, will put back to again after soaking to aqueous cotton 6
Dust compartment 2 covers rear cover 3, and rear cover 3 is fixed by fixing buckle 5, and rear cover 3 cooperates gasket 4 that can rise to dust compartment 2
To sealing function, then outer dust-proof cloth 21 can be wound by velcro 20 after external dust-proof cloth 21 is cleared up
It is fixed on 1 outside of shell, can be begun to use later.
It, first can be by rub piece 13 and wiping cylinder 14 according to Fig. 1-2 and Fig. 4-7 in the use process of device
It is adjacent to the surface to be wiped of blackboard, is then integrally slided along 14 side pushing meanss of wiping cylinder, while wiping cylinder 14
Rotary rolling can be carried out, letter written with chalk is tentatively wiped, rub piece 13 can nuzzle up blackboard later, be wiped again font
It wipes, while during wiping cylinder 14 rotates, movable axis 1402 can be by driving gear 1404 with nutating gear 16
Acceleration rotation is carried out, and transmission gear 16 can drive flabellum 11 quickly to be rotated by transmission belt 17, so that flabellum 11 can
To drive the gas in dust compartment 2 quickly to flow outward, negative pressure is formed inside dust compartment 2, is convenient for driving device wiping process
The dust of middle generation is entered inside dust compartment 2 by entering-dust mouth 7, and most of dust can be attached to the aqueous cotton 6 in dust compartment 2
On, to carry out absorption collection to dust.
In device use process, according to Fig. 4-7, when wiping cylinder 14 is rotated, close to pile layer 1403
Rubber friction block 15 can generate certain electrostatic with 1403 phase mutual friction of pile layer, convenient for improve pile layer 1403 to dust
Adsorption effect, while close to the combing scraper plate 18 of pile layer 1403 cooperation through slot 19 may be constructed the structure pair similar to comb
The pile layer 1403 of rotation wiping cylinder 14 is combed, consequently facilitating the dust adhered in pile layer 1403 is inhaled with air-flow
It takes, prevents the wiping effect for adhering to excessive dust influence device in pile layer 1403.
In the use process of device, according to Fig. 6-8, when flabellum 11 is rotated, the activity of 11 lower end of flabellum
Convex block 12 will do it synchronous rotation, so that the fixed card slot 903 being bonded with movable convex block 12 can carry out one with the rotation of flabellum 11
Fixed shaking, and elastic washer 902 can make dust-filtering plate 901 have certain vibration elastic space, to drive dust-filtering plate 901
It is shaken, prevents from accumulating passing through for a large amount of dust influence air-flow at dust-filtering plate 901, improve the practicability of device, and in device
After use, it can be again turned on rear cover 3, dust compartment 2 and aqueous cotton 6 can be cleared up, here it is the self-dust-suctions
The working principle of formula environment-friendly dust-proof eraser, the content being not described in detail in this specification belong to known in professional and technical personnel in the field
The prior art.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of self-dust absorption type environment-friendly dust-proof eraser, including shell (1), rear cover (3) and rub piece (13), it is characterised in that: the shell
Body (1) is internally provided with dust compartment (2), and the rear of dust compartment (2) is provided with rear cover (3), is set on the inside of the rear cover (3)
It is equipped with gasket (4), and is provided with fixing buckle (5) on the outside of rear cover (3), the dust compartment (2) is internally provided with aqueous cotton
Cloth (6), and the front end of dust compartment (2) is provided with entering-dust mouth (7), is provided with air outlet (8) on the outside of the dust compartment (2), and
The outer end of air outlet (8) is provided with suction opening baffle (9), is provided with ventilation opening (10) on the outside of the air outlet (8), and is divulged information
It is provided with flabellum (11) on the inside of mouth (10), and is provided with movable convex block (12) on the inside of flabellum (11), the rub piece (13)
It is provided with wiping cylinder (14) positioned at the side of the front end of shell (1), and rub piece (13), the rear of the wiping cylinder (14) is set
It is equipped with rubber friction block (15), and the outer end side surface of wiping cylinder (14) is provided with transmission gear (16), and transmission gear
(16) side is provided with transmission belt (17), and the side rear of the wiping cylinder (14) is provided with combing scraper plate (18), and combs
The front end of scraper plate (18) is provided with through slot (19), is provided with velcro (20) on the outside of the shell (1), and velcro (20)
Outside is provided with outer dust-proof cloth (21).
2. a kind of self-dust absorption type environment-friendly dust-proof eraser according to claim 1, it is characterised in that: the dust compartment (2) and shell
Body (1) is integrated, and gasket (4) are provided between dust compartment (2) and rear cover (3), and rear cover (3) and dust compartment
(2) rear side object hinge connection, while being connected with each other between the front end of rear cover (3) and shell (1) by fixing buckle (5).
3. a kind of self-dust absorption type environment-friendly dust-proof eraser according to claim 1, it is characterised in that: the suction opening baffle (9)
Include dust-filtering plate (901), elastic washer (902) and fixed card slot (903), and suction opening baffle (9) be located at air outlet (8) and
Between flabellum (11), and the two sides up and down of dust compartment (2) are provided with air outlet (8).
4. a kind of self-dust absorption type environment-friendly dust-proof eraser according to claim 3, it is characterised in that: the dust filtration plate (901)
It is provided between inside and air outlet (8) elastic washer (902), and the outer middle side part of dust-filtering plate (901) is provided with fixed card slot
(903), and fixed card slot (903) and movable convex block (12) are bonded to each other.
5. a kind of self-dust absorption type environment-friendly dust-proof eraser according to claim 1, it is characterised in that: the flabellum (11) is provided with
2, and flabellum (11) is located between air outlet (8) and ventilation opening (10), and leads between flabellum (11) and transmission gear (16)
Cross transmission belt (17) interconnection.
6. a kind of self-dust absorption type environment-friendly dust-proof eraser according to claim 1, it is characterised in that: wiping cylinder (14) packet
Containing movable roll (1401), movable axis (1402), pile layer (1403) and gear (1404) are driven, and the bottom of wiping cylinder (14)
End height is equal with the floor height of rub piece (13).
7. a kind of self-dust absorption type environment-friendly dust-proof eraser according to claim 6, it is characterised in that: the movable axis (1402) and
Movable roll (1401) is integrated, and passes through driving gear (1404) structure between movable axis (1402) and transmission gear (16)
It is connected at engagement, and drives the transmission ratio of gear (1404) and transmission gear (16) less than 0.5.
8. a kind of self-dust absorption type environment-friendly dust-proof eraser according to claim 6, it is characterised in that: the pile layer (1403) is equal
It is even to be distributed on the outside of movable roll (1401), and the rear of pile layer (1403) and rubber friction block (15) are bonded to each other.
9. a kind of self-dust absorption type environment-friendly dust-proof eraser according to claim 1, it is characterised in that: combing scraper plate (18) position
Between entering-dust mouth (7) and wiping cylinder (14), and the front end for combing scraper plate (18) is evenly distributed with through slot (19), and combs
It is bonded to each other between the front end and wiping cylinder (14) of scraper plate (18).
10. a kind of self-dust absorption type environment-friendly dust-proof eraser according to claim 1, it is characterised in that: the outer dust-proof cloth
(21) it is evenly distributed on the outside of shell (1), and is mutually interconnected between outer dust-proof cloth (21) and shell (1) by velcro (20)
It connects, and the width of outer dust-proof cloth (21) is equal to the thickness of shell (1).
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CN201811562082.3A CN109532293A (en) | 2018-12-20 | 2018-12-20 | A kind of self-dust absorption type environment-friendly dust-proof eraser |
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CN201811562082.3A CN109532293A (en) | 2018-12-20 | 2018-12-20 | A kind of self-dust absorption type environment-friendly dust-proof eraser |
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CN112976894A (en) * | 2021-03-01 | 2021-06-18 | 杨菊红 | Blackboard eraser capable of reducing dust for education and teaching |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112976894A (en) * | 2021-03-01 | 2021-06-18 | 杨菊红 | Blackboard eraser capable of reducing dust for education and teaching |
CN113263855A (en) * | 2021-07-01 | 2021-08-17 | 衡阳云脉科技有限公司 | Vocational skill training is with supplementary teaching equipment |
CN113263855B (en) * | 2021-07-01 | 2022-03-25 | 衡阳云脉科技有限公司 | Vocational skill training is with supplementary teaching equipment |
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Application publication date: 20190329 |