CN207156779U - Blackboard with automatic dedusting function - Google Patents
Blackboard with automatic dedusting function Download PDFInfo
- Publication number
- CN207156779U CN207156779U CN201720436735.8U CN201720436735U CN207156779U CN 207156779 U CN207156779 U CN 207156779U CN 201720436735 U CN201720436735 U CN 201720436735U CN 207156779 U CN207156779 U CN 207156779U
- Authority
- CN
- China
- Prior art keywords
- blackboard
- dust
- dedusting function
- automatic dedusting
- collecting box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000428 dust Substances 0.000 claims abstract description 77
- 241000883990 Flabellum Species 0.000 claims abstract description 17
- 239000012814 acoustic material Substances 0.000 claims description 5
- 238000003915 air pollution Methods 0.000 abstract description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 210000002345 respiratory system Anatomy 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 210000004072 lung Anatomy 0.000 description 2
- 208000004141 microcephaly Diseases 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 206010061218 Inflammation Diseases 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000621 bronchi Anatomy 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 230000005494 condensation Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 210000000981 epithelium Anatomy 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000001900 immune effect Effects 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003902 lesion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 210000001989 nasopharynx Anatomy 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 125000000914 phenoxymethylpenicillanyl group Chemical group CC1(S[C@H]2N([C@H]1C(=O)*)C([C@H]2NC(COC2=CC=CC=C2)=O)=O)C 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002685 pulmonary effect Effects 0.000 description 1
- 206010039083 rhinitis Diseases 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Drawing Aids And Blackboards (AREA)
Abstract
It the utility model is related to a kind of blackboard with automatic dedusting function, including blackboard body, blackboard body includes preceding blackboard and rear blackboard, the cavity of closing is formed between preceding blackboard and rear blackboard, some air suction openings are offered on preceding blackboard, also include the dust arrester being arranged in cavity, dust arrester includes supporting box, motor and motor control module are installed in supporting box, flabellum is installed on the output shaft of motor, dust-collecting box is provided with the lower section of flabellum, also offer suction port and exhaust outlet respectively on supporting box, the both sides of suction port communicate with cavity and dust-collecting box respectively, exhaust outlet is communicated by blast pipe with outside.This programme can effectively collect chalk dust on the premise of chalk-writing is not influenceed, and reduce air pollution caused by chalk dust floating in atmosphere, while use and also very facilitate.
Description
Technical field
The utility model belongs to teaching equipment technical field, and in particular to a kind of blackboard with automatic dedusting function.
Background technology
With the development of computer technology, although multimedia teaching there has been significant progress, but because multimedia is taught
The not intuitive learned and need the speciality such as early-stage preparations, the teaching of traditional chalk black still occupies in present educational institution
Leading position.And the mainly common common blackboard that existing market occupation rate is higher, normal blackboard without dedusting function, when with
Blackboard eraser can produce the tiny chalk dust of many when erasing the board, these float the not only seriously pollution teaching of skyborne dust
Environment, and the healths of Faculty and Students is also generated and greatly threatened.
Because chalk is alkaline matter, and typically the content of cadmium metal is higher in chalk, in addition the particulate of chalk dust
Son has very strong germ adsorption capacity again.Therefore Long Term Contact or suction chalk dust, can to the respiratory system of people, skin,
The organs such as eyes cause greatly to damage.In teaching process, majority is delayed at alveolar after chalk dust is inhaled into lung
Interior, by a series of stimulation, chemistry and immune effect can cause lung's loss to include inflammation in respiratory system and pulmonary ventilation
Function reduction.In addition, during chalk dust is sucked, part dust can stay in the upper respiratory tract, to mucous epithelium
Cell produces mechanical stimulus and damage, and a series of lesion can be caused for a long time by working in such a case, wherein the influence to nose
Rhinitis sicca is most commonly induced, in addition even it is also possible to causing the canceration of the parts such as nasopharynx, bronchus.Ordinary circumstance
Under, class-teaching of teacher is often repeatedly erasable on blackboard, and student is not only responsible for erasing the board after class for task, and again from morning to
Evening is in classroom, therefore either teacher or student are under the environment of dust from flying for a long time.Particularly, minority student
Poor for the resistance of chalk dust, it is very unfavorable for its health to be under the environment of dust from flying.
At this stage, also there are certain methods in face of blackboard dust removal problem.The first is wiped using dust-removing blackboard, the blackboard eraser
With long a hose or dust cover, though certain dustproof function can be played, when being wiped to blackboard, by
A long hose is connected in blackboard eraser, therefore limitation when in use is bigger；And when people's wiping amplitude is excessive
Or wiping speed it is too fast when, dust removing effects extreme difference.Second is to use electronic blackboard, without dust, is not polluted, but is operated
Property is more complicated, it is impossible to suitable for general teacher and older teacher.So after installation electronic blackboard even occurs sometimes, do not go
With, or former old-fashioned blackboard is used, cause the phenomenon of the waste of resource.The third is the micronic dust that occurs in recent years and dustless
Chalk, this chalk are substantially what is produced by dosing 107 glue, although this kind of chalk few dust from flying in writing,
In erasing because of the disappearance of adhesive action, can equally produce it is a large amount of fly upward dust, and 107 glue be by PVA, hydrochloric acid, formaldehyde and
Caustic soda condensation forms, so contain a certain amount of free formaldehyde in 107 glue, and free formaldehyde category carcinogen, if this
The dust containing free formaldehyde is by Faculty and Students' suction body a bit, its it is potentially hazardous will be very serious.Also have in addition and use glass
Glass plate and watercolor pencil replace the situation of traditional blackboard writing, and dust is avoided although being write on a glass using watercolor pencil,
The Costco Wholesale of water-color paintbrush is significantly larger than common chalk, plus teacher attend class needs watercolor pencil amount it is a lot, so this scheme
It is impracticable.
In summary, although having some apparatus and method for blackboard dust removal problem at this stage, these apparatus and method
The problem of many and deficiency when in use be present.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of blackboard with automatic dedusting function, the blackboard energy
Chalk dust can be effectively collected on the premise of chalk-writing is not influenceed, reduces air pollution caused by chalk dust, simultaneously
Using very convenient.
To reach above-mentioned purpose, the utility model provides following technical scheme：
Blackboard with automatic dedusting function, including blackboard body, blackboard body include preceding blackboard and rear blackboard, preceding blackboard
The cavity of closing is formed between rear blackboard, some air suction openings communicated with cavity are offered on preceding blackboard, in addition to be arranged on
Some dust arresters in cavity, dust arrester include supporting box, motor and motor control module are provided with supporting box,
Flabellum is installed on the output shaft of motor, is provided with dust-collecting box in the lower section of flabellum, also offers dust suction respectively on supporting box
Mouth and exhaust outlet, the both sides of suction port are communicated with cavity and dust-collecting box respectively, and exhaust outlet is communicated by blast pipe with outside.
Preferably, a diameter of 400-600 μm of the air suction opening opened up on the preceding blackboard, the center of two neighboring air suction opening
Away from for 9000-10000 μm.By the document of correlation, the diameter of chalk dust is at 10 μm or so, and common chalk is big
The diameter of head is 10000 μm, and the diameter of chalk microcephaly is 8000 μm, in this programme, by the diameter of the air suction opening on preceding blackboard
400-600 μm is designed as, the entrance of chalk dust can be met, while the normal writing of chalk will not be impacted again.
Preferably, the downside of the blackboard body is provided with the dividing plate for being used for placing blackboard eraser, is offered on the dividing plate straight
Footpath is 1800-2200 μm of air suction opening.Dividing plate on the downside of blackboard body is used to placing blackboard eraser, the use that Convenient blackboard is wiped, together
When 1800-2200 μm of air suction opening is opened up on dividing plate, for absorbing the dust not absorbed by the air suction opening on preceding blackboard, enter one
Step, which is reduced, floats aerial dust.
Preferably, a diameter of 500 μm of the air suction opening opened up on the preceding blackboard, the air suction opening opened up on the dividing plate
A diameter of 2000 μm.
Preferably, it is provided with dirt catcher towards the side of flabellum in dust-collecting box.Dirt catcher only allows air by and in air
Chalk dust will be blocked in dust-collecting box.
Preferably, the outside of the supporting box is provided with sound panel made of acoustic material.Because motor is in high speed rotation
During can produce and vibrate and produce noise, in the outside of supporting box, sound panel made of acoustic material, sound panel energy are set
By motor rotate caused by noise attenuation to minimum, reduce the influence that noise is brought to academics and students.
Preferably, the dust-collecting box is slidably connected with supporting box, is additionally provided with the dust-collecting box and is moved easily integrated box
Handle.When the dust collection in dust-collecting box for a period of time after, dust-collecting box is skidded off from supporting box by handle, so as to handle
Existing dust is cleared up in dust-collecting box, and ensure that in dust-collecting box has enough spaces to be used to collect dust all the time.
Preferably, the baffle plate for preventing debris from entering blast pipe is provided with blast pipe.Baffle plate can prevent outside debris from entering
Into blast pipe, blocking caused by thus avoid debris into blast pipe, the normal work of dust arrester ensure that.
Preferably, dust arrester totally two, two dust arresters are symmetrically mounted on the both sides of blackboard body.Two dedusting dresses
Put from the both sides of blackboard body and dust caused by chalk is absorbed, improve the assimilation effect to dust.
Preferably, the motor is variable-frequency motor.The control of variable-frequency motor is very convenient, when needing variable-frequency motor with difference
Rotating speed drive fan running when, it is only necessary to change the frequency of supply of variable-frequency motor.
Principle of the present utility model is：When the blackboard in using this programme is imparted knowledge to students, preceding blackboard is mainly used in book
Write, when being wiped using blackboard eraser to preceding blackboard, motor control module controlled motor rotates at a high speed, what motor rotated at a high speed
Flabellum is driven to rotate at a high speed simultaneously, flabellum will produce local decompression while rotation at a high speed, in the presence of the negative pressure, wipe out
Chalk dust be inhaled into by the air suction opening on preceding blackboard in cavity, be drawn into the dust in cavity further in flowing
It is flowed into the presence of air in dust-collecting box, in the presence of dirt catcher, dust is limited in dust-collecting box, and the air flowed
Then finally discharged by dirt catcher through blast pipe, when the dust in dust-collecting box runs up to a certain amount of, by handle by dust-collecting box
Skidded off out of supporting box, and the dust in dust-collecting box is cleared up, so can be real to be collected again to dust
Existing automatic dust removing effect.
The effect of this programme is：This programme can effectively collect chalk dust on the premise of chalk-writing is not influenceed,
Air pollution caused by reducing chalk dust floating in atmosphere, while the blackboard only needs to start motor when in use so that
Rotation produces the negative pressure i.e. achievable absorption to dust to motor driven flabellum at a high speed, and it is also very convenient to use.
Brief description of the drawings
In order that the purpose of this utility model, technical scheme and beneficial effect are clearer, the utility model provides as follows
Accompanying drawing illustrates：
Fig. 1 is the structural representation for the blackboard that the utility model has automatic dedusting function；
Fig. 2 is the front view for the blackboard that the utility model has automatic dedusting function；
Fig. 3 is the sectional view for the blackboard that the utility model has automatic dedusting function；
Fig. 4 is the enlarged diagram at A in Fig. 3.
Mark in Figure of description is as follows：Blackboard body 1, preceding blackboard 11, rear blackboard 12, dividing plate 2, supporting box 31,
Motor 32, motor control module 33, flabellum 34, dust-collecting box 35, handle 36, dirt catcher 37, suction port 38, blast pipe 39, baffle plate
40th, sound panel 41.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail.
As shown in accompanying drawing 1, accompanying drawing 2 and accompanying drawing 3, there is the blackboard of automatic dedusting function, including blackboard body 1, blackboard sheet
Body 1 includes preceding blackboard 11 and rear blackboard 12, wherein preceding blackboard 11 is mainly used in writing, is formed between preceding blackboard 11 and rear blackboard 12
The cavity of closing, some air suction openings are offered on preceding blackboard 11, the air suction opening is in array distribution, air suction opening and cavity phase
Logical, a diameter of 400-600 μm of air suction opening, the centre-to-centre spacing of two neighboring air suction opening is 9000-10000 μm, in the present embodiment,
A diameter of 500 μm of air suction opening, the centre-to-centre spacing of two neighboring air suction opening is 10000 μm, passes through the document of correlation, chalk powder
The diameter of dirt is at 10 μm or so, and the diameter of common chalk major part is 10000 μm, and the diameter of chalk microcephaly is 8000 μm, on
The dimensional parameters of air suction opening are stated, the entrance of chalk dust can be met, while the normal writing of chalk will not be impacted again.
Dividing plate 2 is provided with the downside of blackboard body 1, dividing plate 2 is mainly used in placing blackboard eraser, opens and also be provided with directly on dividing plate 2
Footpath is 1800-2200 μm of air suction opening, in the present embodiment, a diameter of 2000 μm of air suction opening on dividing plate 2, and the suction on dividing plate 2
Dirt hole is mainly used in absorbing the chalk dust for not absorbed and being dropped by preceding blackboard 11, further reduces floating aerial dust
Amount.
Two dust arresters are installed in the cavity that preceding blackboard 11 and rear blackboard 12 are formed, two dust arresters are symmetrically pacified
Mounted in the both sides of blackboard body 1, for being absorbed from both sides to dust, the assimilation effect to dust is ensure that, such as the institute of accompanying drawing 4
Show, dust arrester includes supporting box 31, is provided with motor 32 and motor control module 33 in supporting box 31, in the present embodiment
Motor 32 be variable-frequency motor, the control of variable-frequency motor is very convenient, changes the frequency for being passed into electric current in variable-frequency motor, i.e.,
The rotating speed of variable-frequency motor can be changed.Motor control module 33 is used for startup, stopping and operation of controlled motor 32 etc..
Flabellum 34 is connected with the output shaft of motor 32, when being rotated at a high speed under drive of the flabellum 34 in motor 32, fan
The surrounding of leaf 34 can produce local negative pressure, and dust-collecting box 35 is also equipped with the downside of flabellum 34, and dust-collecting box 35 is slidably connected at branch
Support in casing 31, offer suction port 38 in the position that supporting box 31 and dust-collecting box 35 coordinate, the side of suction port 38 and chamber
Body phase is led to, and opposite side communicates with dust-collecting box 35, when chalk dust in the presence of negative pressure after air suction opening enters cavity, then enter
One step is entered in dust-collecting box 35 through suction port 38, and handle 36 is additionally provided with dust-collecting box 35, when the dust in dust-collecting box 35 is received
After collecting a period of time, dust-collecting box 35 is skidded off from supporting box 31 by handle 36, so as to existing powder in dust-collecting box 35
Dirt is cleared up, and ensure that in dust-collecting box 35 has enough spaces to be used to collect dust all the time.
Dirt catcher 37 is also equipped with the side of dust-collecting box 35 towards flabellum 34, the dirt catcher 37, which can be realized, only allows sky
For gas by the effect without allowing dust to pass through, therefore in the presence of the dirt catcher 37, dust is completely blocked in dust-collecting box
In 35.
Exhaust outlet is further opened with the supporting box 31 of the upside of motor 32, blast pipe 39 is installed in exhaust ports, is arranged
Tracheae 39 communicates after passing through cavity with outside, and for air to be discharged, being additionally provided with blast pipe 39 prevents debris from entering exhaust
The baffle plate 40 of pipe 39.Baffle plate 40 can prevent outside debris from entering in blast pipe 39, thus avoid debris and enter blast pipe 39
Caused by blocking, ensure that the normal work of dust arrester.
Sound panel 41 made of acoustic material are additionally provided with the outside of supporting box 31, because motor 32 is in high speed rotation
During can produce and vibrate and produce noise, in the outside of supporting box 31, sound panel 41 made of acoustic material, sound insulation are set
Plate 41 can rotate motor 32 caused noise attenuation to influence minimum, that reduction noise is brought to academics and students.
When blackboard in use this programme is imparted knowledge to students, preceding blackboard 11 is mainly used in writing, when use blackboard eraser is to preceding
When blackboard 11 is wiped, the controlled motor 32 of motor control module 33 is rotated at a high speed, and fan is driven while motor 32 rotates at a high speed
Leaf 34 rotates at a high speed, and flabellum 34 will produce local decompression while rotation at a high speed, in the presence of the negative pressure, the powder that wipes out
Dust is inhaled into cavity by the air suction opening on preceding blackboard 11, is drawn into the dust in cavity further in the sky of flowing
It is flowed into the presence of gas in dust-collecting box 35, in the presence of dirt catcher 37, dust is limited in dust-collecting box 35, and flow
Air is then finally discharged by dirt catcher 37 through blast pipe 39, when the dust in dust-collecting box 35 runs up to a certain amount of, passes through handle
Hand 36 skids off dust-collecting box 35 out of supporting box 31, and the dust in dust-collecting box 35 is cleared up, so as to again to dust
It is collected, automatic dust removing effect so can be achieved.
Finally illustrate, preferred embodiment above is only unrestricted to illustrate the technical solution of the utility model, to the greatest extent
The utility model has been described in detail by above preferred embodiment for pipe, but those skilled in the art should manage
Solution, can make various changes, without departing from the utility model claims book institute to it in the form and details
The scope of restriction.
Claims (10)
1. the blackboard with automatic dedusting function, including blackboard body, it is characterised in that：Blackboard body includes preceding blackboard and rear black
Plate, the cavity of closing is formed between preceding blackboard and rear blackboard, some air suction openings communicated with cavity are offered on preceding blackboard, are also wrapped
Some dust arresters in cavity are included, dust arrester includes supporting box, motor and motor are provided with supporting box
Control module, flabellum is installed on the output shaft of motor, is provided with dust-collecting box in the lower section of flabellum, is also opened respectively on supporting box
Provided with suction port and exhaust outlet, the both sides of suction port communicate with cavity and dust-collecting box respectively, and exhaust outlet passes through blast pipe and outside
Communicate.
2. the blackboard according to claim 1 with automatic dedusting function, it is characterised in that：Opened up on the preceding blackboard
A diameter of 400-600 μm of air suction opening, the centre-to-centre spacing of two neighboring air suction opening is 9000-10000 μm.
3. the blackboard according to claim 2 with automatic dedusting function, it is characterised in that：The downside of the blackboard body
Provided with the dividing plate for placing blackboard eraser, a diameter of 1800-2200 μm of air suction opening is offered on the dividing plate.
4. the blackboard according to claim 3 with automatic dedusting function, it is characterised in that：Opened up on the preceding blackboard
A diameter of 500 μm of air suction opening, a diameter of 2000 μm of the air suction opening opened up on the dividing plate.
5. the blackboard according to any one of claims 1 to 4 with automatic dedusting function, it is characterised in that：In dust-collecting box face
Dirt catcher is provided with to the side of flabellum.
6. the blackboard according to claim 5 with automatic dedusting function, it is characterised in that：The outside of the supporting box
Provided with sound panel made of acoustic material.
7. the blackboard according to claim 6 with automatic dedusting function, it is characterised in that：The dust-collecting box and support case
Body is slidably connected, and the handle for being moved easily integrated box is additionally provided with the dust-collecting box.
8. the blackboard according to claim 7 with automatic dedusting function, it is characterised in that：Being provided with blast pipe prevents
Debris enters the baffle plate of blast pipe.
9. the blackboard according to claim 8 with automatic dedusting function, it is characterised in that：Dust arrester totally two, two
Individual dust arrester is symmetrically mounted on the both sides of blackboard body.
10. the blackboard according to claim 9 with automatic dedusting function, it is characterised in that：The motor is variable-frequency electric
Machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720436735.8U CN207156779U (en) | 2017-04-24 | 2017-04-24 | Blackboard with automatic dedusting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720436735.8U CN207156779U (en) | 2017-04-24 | 2017-04-24 | Blackboard with automatic dedusting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207156779U true CN207156779U (en) | 2018-03-30 |
Family
ID=61708877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720436735.8U Expired - Fee Related CN207156779U (en) | 2017-04-24 | 2017-04-24 | Blackboard with automatic dedusting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207156779U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108790492A (en) * | 2018-05-30 | 2018-11-13 | 杨先平 | A kind of teaching apparatus for mathematics has the blackboard for education of dust-absorbing function |
| CN110757991A (en) * | 2019-11-12 | 2020-02-07 | 江苏斯固信息科技有限公司 | Teaching aid for drawing on blackboard plane |
| CN112150889A (en) * | 2020-09-23 | 2020-12-29 | 承德石油高等专科学校 | English teaching experience exchanges board |
-
2017
- 2017-04-24 CN CN201720436735.8U patent/CN207156779U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108790492A (en) * | 2018-05-30 | 2018-11-13 | 杨先平 | A kind of teaching apparatus for mathematics has the blackboard for education of dust-absorbing function |
| CN110757991A (en) * | 2019-11-12 | 2020-02-07 | 江苏斯固信息科技有限公司 | Teaching aid for drawing on blackboard plane |
| CN112150889A (en) * | 2020-09-23 | 2020-12-29 | 承德石油高等专科学校 | English teaching experience exchanges board |
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Legal Events
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180330 |