CN208615592U - Small intelligent dust-free black board eraser - Google Patents
Small intelligent dust-free black board eraser Download PDFInfo
- Publication number
- CN208615592U CN208615592U CN201820977157.3U CN201820977157U CN208615592U CN 208615592 U CN208615592 U CN 208615592U CN 201820977157 U CN201820977157 U CN 201820977157U CN 208615592 U CN208615592 U CN 208615592U
- Authority
- CN
- China
- Prior art keywords
- main body
- small
- dust
- blackboard
- blackboard eraser
- 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
Landscapes
- Drawing Aids And Blackboards (AREA)
Abstract
The utility model provides small intelligent dust-free black board eraser, including main body, dust collection mechanism, Chu Chen mechanism and walking mechanism, motor-driven mechanism insertion is set to body interior, Chu Chen mechanism is set to bottom part body, walking mechanism is set in front of main body, main body includes blackboard eraser main body, soft cotton rub item, suction inlet, handle and charging jack, insertion is provided with soft cotton rub item in the middle part of blackboard eraser main body, and three soft cotton rub items are linearly arranged from left to right, the insertion of blackboard eraser main body front is provided with suction inlet, and suction inlet is located at left and right sides of soft cotton rub item, the insertion of blackboard eraser bottom part body is provided with handle, the insertion of blackboard eraser body top is provided with charging jack.The utility model stable structure, automatic blackboard cleaning effect is good, the dust-free black board eraser stay in grade that can sufficiently keep, and avoiding existing dust-free black board eraser still cannot thoroughly solve the problems, such as to need to erase the board manually, there is very high promotional value.
Description
Technical field
The utility model relates to blackboard eraser technical fields, specifically, being related to small intelligent dust-free black board eraser.
Background technique
Blackboard eraser is the tool for wiping chalk writing.
Dust-free black board eraser refers to that blackboard eraser mainly overcomes current blackboard eraser low efficiency, the drawbacks such as dust from flying.Use it
Teachers and students can be made easily to wipe clean letter written with chalk, and fulsome chalk dust will not be generated, greatly change classroom
Inside and outside sanitation and hygiene, beneficial to teachers and students health and create an excellent teaching environment to them.
There are the periodical and document of many research dust-free black board erasers in the prior art, wherein a patent
The patent application of CN201621243058.X, this application provide it is a kind of it is electronic wiped from cleaning dust-free blackboard, by being provided with shell
The front end of body is provided with electronic brush roll, and the Electric brush of bristles roller for allowing to rotate replaces traditional manual sliding to wipe, but
It is that this kind of electronic self-erasing dust-free blackboard is wiped or cannot thoroughly solve the problems, such as to need to erase the board manually, automatic sassafras blackboard effect is not
Good, the chalk dust that especially fan inspiration is gone cannot keep apart, and turbine fan is caused to blow to fly upward everywhere by chalk dust, influence
The problem of pick-up performance.Therefore, it is necessary to further be studied on existing blackboard eraser, small intelligent dust-free blackboard is provided
It wipes.
Utility model content
The purpose of this utility model is to provide small intelligent dust-free black board erasers, mentioned above in the background art to solve
Existing dust-free black board eraser still cannot thoroughly solve the problems, such as to need the chalk dust to erase the board manually and fan inspiration is gone cannot
The problem of keeping apart.
To achieve the above object, the utility model provides the following technical solutions, small intelligent dust-free black board eraser, including master
Body, dust collection mechanism, Chu Chen mechanism and walking mechanism, motor-driven mechanism insertion are set to body interior, and Chu Chen mechanism is set to main body
Bottom, walking mechanism are set in front of main body,
Main body includes blackboard eraser main body, soft cotton rub item, suction inlet, handle and charging jack, the blackboard eraser main body middle part
Insertion is provided with soft cotton rub item, and three soft cotton rub items are linearly arranged from left to right, the insertion setting of blackboard eraser main body front
There is suction inlet, and suction inlet is located at left and right sides of soft cotton rub item, the blackboard eraser bottom part body insertion is provided with handle, described black
The insertion of blackboard eraser body top is provided with charging jack,
Dust collection mechanism includes servo battery, miniature motor, compact actuator, turbine fan and switch button, described
The insertion of blackboard eraser body interior is provided with servo battery, and servo battery is located on the downside of charging jack, on the downside of the servo battery
It is fixedly connected with miniature motor, is fixedly connected to compact actuator at left and right sides of the miniature motor, it is two described small
Be connected with turbine fan at left and right sides of type driver, and miniature motor, compact actuator and turbine fan it
Between be electrically connected, blackboard eraser body side insertion is provided with switch button, and the blackboard eraser body interior insertion is provided with
Controller, and controller and miniature motor are electrically connected, and controller is provided with signal receiving end,
Chu Chen mechanism includes dust-collecting cavity, separation net, the opening of falling dirt and fixed card buckle, and activity connects on the right side of the blackboard eraser main body
It is connected to dust-collecting cavity, insertion is provided with separation net in the middle part of the dust-collecting cavity, and the shape of separation net is consistent with turbine fan, described
The insertion of dust-collecting cavity side is provided with the opening of falling dirt, and the opening of the falling dirt side is connected with fixed card buckle,
Walking mechanism includes that intelligence wipes device, magnetic stripe, small-sized traveling wheel and angle displacement sensor, the blackboard eraser main body
Middle part insertion is provided with intelligence and wipes device, and intelligence is wiped device and is located between two soft cotton rub items, and the intelligence wipes device by magnetic
Item, small-sized traveling wheel and angle displacement sensor form, and the intelligence wiping device upper and lower ends, which are embedded in, is provided with magnetic stripe, described
Intelligence wipes and is connected with small-sized traveling wheel in the middle part of device, and small-sized traveling wheel is respectively positioned on the inside of magnetic stripe, and traveling wheel with
Compact actuator is electrically connected, and insertion is provided with angle displacement sensor in the middle part of the small-sized traveling wheel, and angle displacement senses
Device is provided with signal output end.
As further program of the utility model, the separation net is in arc-shaped, and the arrangement and turbine type of separation net
Fan is consistent.
As further program of the utility model, the open outer side of falling dirt is provided with removable cover, and top is provided with
Card slot.
As further program of the utility model, the fixed card buckle engages with the card slot in the opening of falling dirt in fixation
Shape, and fixed card buckle is set on the removable cover for the open outer side of falling dirt.
As further program of the utility model, described two magnetic stripes be in upper and lower symmetry shape, and the height of magnetic stripe with it is small
Type traveling wheel is consistent.
As further program of the utility model, described two small-sized traveling wheels are matched, and two small-sized walkings
Wheel middle part is provided with small-sized roller bearing.
As further program of the utility model, the signal output end and controller signals of the angle displacement sensor
Receiving end is connected in signal.
Compared with prior art, the utility model has the beneficial effects that this kind of small intelligent dust-free black board eraser, passes through isolation
Net in the chalk dust Quarantine at assembly sites to dust-collecting cavity of turbine fan inspiration, will avoid chalk dust from being blown everywhere, to solve
The chalk dust that fan inspiration is gone of having determined cannot keep apart, and cause turbine fan to blow to fly upward everywhere by chalk dust, influence dust suction
The problem of the problem of effect, is reached and is convenient for chalk by the fixed card buckle and the opening movable of falling dirt dynamic circuit connector shape on removable cover
The purpose that ash is poured out mutually is attracted by magnetic stripe with blackboard, and magnetic stripe height is consistent with small-sized traveling wheel, drives small-sized traveling wheel
Blackboard eraser main body will not fall down when rolling and wipe along blackboard surrounding from blackboard, sense turning by angle displacement sensor
Turning signal can be sent in the signal receiving end of controller by place by signal output end, control small-sized electric by controller
Machine and compact actuator indicate that small-sized traveling wheel is turned, and make to be rebuffed when its automatic blackboard cleaning, to solve existing dustless
Blackboard eraser still cannot thoroughly solve the problems, such as to need to erase the board manually.
To sum up, whole device stable structure, automatic blackboard cleaning effect is good, and the dust-free black board eraser quality that can sufficiently keep is steady
Fixed, avoiding existing dust-free black board eraser still cannot thoroughly solve the problems, such as to need to erase the board manually, there is very high popularization
Value.
Detailed description of the invention
Fig. 1 is the integral outer structural schematic diagram of the utility model.
Fig. 2 is the blackboard eraser body interior schematic cross-sectional view of the utility model.
Fig. 3 is that the intelligence of the utility model wipes device partial structural diagram.
In figure: 1- blackboard eraser main body, the soft cotton rub item of 2-, 3- suction inlet, 4- handle, 5- charging jack, 6- dust-collecting cavity, 7- are watched
Take battery, 8- miniature motor, 9- compact actuator, 10- turbine fan, 11- switch button, 12- intelligence wiping device, 601-
Separation net, the 602- opening of falling dirt, 603- fixed card buckle, 1201- magnetic stripe, the small-sized traveling wheel of 1202-, 1203- angle displacement sensing
Device.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
The servo battery 7, miniature motor 8, compact actuator 9, turbine fan 10, small-sized traveling wheel of the utility model
1202, angle displacement sensor 1203 can obtain in market or private customization, further include to miniature motor 8, small-sized drive
Dynamic device 9, turbine fan 10, small-sized traveling wheel 1202, the controller controlled, concrete model is the ordinary skill in the art
Means are no longer repeated.
Servo battery size in the utility model is CQM1H (Lan Hua Science and Technology Ltd., Shenzhen)
Miniature motor model 64ZYTA104 (Changzhou U.S. mulberry electromechanics Co., Ltd)
Compact actuator model 197901 (Shanghai state and automation equipment Co., Ltd)
Turbine fan model 25489 (Xu Hongxiang Electronics Co., Ltd., Shenzhen)
Small-sized traveling wheel model AE1748F (Hebei Hao Shiduo rubber and plastic Science and Technology Ltd.)
Angle displacement sensor model PS09 (Suzhou Gao Tu Electronic Science and Technology Co., Ltd.)
Please refer to Fig. 1~3, in the utility model embodiment, to achieve the above object, the utility model provides following technology
Scheme, small intelligent dust-free black board eraser, including main body, dust collection mechanism, Chu Chen mechanism and walking mechanism, motor-driven mechanism insertion setting
In body interior, Chu Chen mechanism is set to bottom part body, and walking mechanism is set in front of main body,
Main body includes blackboard eraser main body 1, soft cotton rub item 2, suction inlet 3, handle 4 and charging jack 5, in blackboard eraser main body 1
Portion's insertion is provided with soft cotton rub item 2, and the linear arrangement from left to right of three soft cotton rub items 2, the 1 front insertion setting of blackboard eraser main body
There is suction inlet 3, and suction inlet 3 is located at soft 2 left and right sides of cotton rub item, the insertion of 1 bottom of blackboard eraser main body is provided with handle 4, blackboard
It wipes insertion at the top of main body 1 and is provided with charging jack 5,
Dust collection mechanism includes servo battery 7, miniature motor 8, compact actuator 9, turbine fan 10 and switch button
11, blackboard eraser main body 1, which is internally embedded, is provided with servo battery 7, and servo battery 7 is located at 5 downside of charging jack, servo battery 7
Downside is fixedly connected with miniature motor 8, and compact actuator 9 is fixedly connected at left and right sides of miniature motor 8, and two small-sized
9 left and right sides of driver is connected with turbine fan 10, and miniature motor 8, compact actuator 9 and turbine fan
It is electrically connected between 10, the insertion of 1 side of blackboard eraser main body is provided with switch button 11, and blackboard eraser main body 1, which is internally embedded, to be provided with
Controller 13, and controller 13 and miniature motor 8 are electrically connected, and controller 13 is provided with signal receiving end,
Chu Chen mechanism includes dust-collecting cavity 6, separation net 601, the opening of falling dirt 602 and fixed card buckle 603, and blackboard eraser main body 1 is right
Side is connected with dust-collecting cavity 6, and insertion is provided with separation net 601, and the shape and turbine type of separation net 601 in the middle part of dust-collecting cavity 6
Fan 10 is consistent, and the insertion of 6 side of dust-collecting cavity is provided with the opening of falling dirt 602, and 602 side of the opening of falling dirt is connected with fixed card buckle
603,
Walking mechanism includes that intelligence wipes device 12, magnetic stripe 1201, small-sized traveling wheel 1202 and angle displacement sensor 1203,
Insertion is provided with intelligence and wipes device 12 in the middle part of blackboard eraser main body 1, and intelligence is wiped device 12 and is located between two soft cotton rub items 2, intelligence
Device 12 can be wiped to be made of magnetic stripe 1201, small-sized traveling wheel 1202 and angle displacement sensor 1203, intelligence wipes about 12 device
Both ends, which are embedded in, is provided with magnetic stripe 1201, and intelligence wipes 12 middle part of device and is connected with small-sized traveling wheel 1202, and small-sized row
It walks wheel 1202 and is respectively positioned on 1201 inside of magnetic stripe, and traveling wheel 1202 and compact actuator 9 are electrically connected, small-sized traveling wheel 1202
Middle part insertion is provided with angle displacement sensor 1203, and angle displacement sensor 1203 is provided with signal output end.
Further, separation net 601 is in arc-shaped, and the arrangement of separation net 601 and turbine fan 10 are consistent, work as turbine
When soft cotton rub item 2 is wiped dynamic chalk dust inspiration dust-collecting cavity 6 by formula fan 10, has by separation net 601 and be isolated in chalk dust
Effect in dust-collecting cavity 6 reaches and the chalk dust that absorption is come in is concentrated in dust-collecting cavity 6, chalk dust is avoided to be blown to obtain
Place is all.
Further, 602 outside of the opening of falling dirt is provided with removable cover, and top is provided with card slot, when chalk dust is filled with storage
When dirt chamber 6, have the characteristics that be convenient to clean dust by the opening of falling dirt 602, reaches the effect convenient for pouring out chalk dust.
Further, fixed card buckle 603 engages shape in fixation with the card slot in the opening of falling dirt 602, and fixed card buckle 603 is set
It is placed on the removable cover in 602 outside of the opening of falling dirt, the opening of falling dirt 602 can be engaged by fixed card buckle 603, be reached work
Dynamic lid and the securing purpose of the opening of falling dirt 602.
Further, two magnetic stripes 1201 are in upper and lower symmetry shape, and the height of magnetic stripe 1201 and small-sized traveling wheel 1,202 1
It causes, is mutually attracted by magnetic stripe 1201 with blackboard, make it will be in the suspension to blackboard of blackboard eraser main body 1.
Further, two small-sized traveling wheels 1202 match, and are provided in the middle part of two small-sized traveling wheels 1202
Small-sized roller bearing can drive the small-sized roller bearing in small-sized traveling wheel 1202 to roll, since magnetic stripe 1201 is high by compact actuator 9
Degree is consistent with small-sized traveling wheel 1202, makes small-sized traveling wheel 1202 that blackboard eraser main body 1 be driven to be rolled when wiping along blackboard surrounding not
It can fall down from blackboard.
Further, the signal output end of angle displacement sensor 1203 and 13 signal receiving end of controller connect in signal
It connects, when angle displacement sensor 1203 senses that turning signal can be sent to controller 13 by signal output end by corner
In signal receiving end, miniature motor 8 is controlled by controller 13 and compact actuator 9 indicates that small-sized traveling wheel 1202 is turned,
Reach the purpose of automatic blackboard cleaning.
Working principle, firstly, being full of using the preceding servo battery 7 by blackboard eraser main body 1 by charging jack 5
Electricity allows to hang blackboard eraser main body 1 to blackboard, turns on the switch button 11 since magnetic stripe 1201 mutually attracts with blackboard,
It is consistent with small-sized traveling wheel 1202 by 1201 height of magnetic stripe, when compact actuator 9 drive it is small-sized in small-sized traveling wheel 1202
When roller bearing rolls, make small-sized traveling wheel 1202 that blackboard eraser main body 1 be driven not fall from blackboard when rolling and wipe along blackboard surrounding
Then the effect got off is connect in signal with controller 13 by angle displacement sensor 1203, works as angle displacement sensor
1203 sense that turning signal can be sent in the signal receiving end of controller 13 by corner by signal output end, pass through control
Device 13 processed controls miniature motor 8 and compact actuator 9 indicates that small-sized traveling wheel 1202 is turned, and makes small-sized traveling wheel 1202 can be with
It drives 1 intelligence of blackboard eraser main body to turn round and wipes the effect of blackboard, then, fitting is matched by miniature motor 8 and compact actuator 9
Make, in the blackboard ash inspiration dust-collecting cavity 6 for wiping turbine fan 10 by soft cotton rub item 2, finally, can by separation net 601
Blackboard ash to be isolated in dust-collecting cavity 6, to have the function that turbine fan 10 is avoided to blow to be everywhere by chalk dust.
The above are merely preferred embodiments of the present invention, it is noted that for those skilled in the art,
Without departing from the concept of the premise utility, several modifications and improvements can also be made, these also should be considered as practical
Novel protection scope, these all will not influence the effect and patent practicability of the utility model implementation.
Claims (7)
1. small intelligent dust-free black board eraser, including main body, dust collection mechanism, Chu Chen mechanism and walking mechanism, motor-driven mechanism insertion is set
It is placed in body interior, Chu Chen mechanism is set to bottom part body, and walking mechanism is set in front of main body, which is characterized in that
Main body includes blackboard eraser main body (1), soft cotton rub item (2), suction inlet (3), handle (4) and charging jack (5), the blackboard
It wipes insertion in the middle part of main body (1) and is provided with soft cotton rub item (2), and the linear arrangement from left to right of three soft cotton rub items (2), the blackboard
It wipes the insertion of main body (1) front to be provided with suction inlet (3), and suction inlet (3) is located at left and right sides of soft cotton rub item (2), the blackboard
It wipes the insertion of main body (1) bottom to be provided with handle (4), insertion is provided with charging jack (5) at the top of the blackboard eraser main body (1), is inhaled
Dirt mechanism includes servo battery (7), miniature motor (8), compact actuator (9), turbine fan (10) and switch button
(11),
The blackboard eraser main body (1), which is internally embedded, to be provided with servo battery (7), and servo battery (7) is located under charging jack (5)
Side, servo battery (7) downside is fixedly connected with miniature motor (8), fixed at left and right sides of the miniature motor (8)
It is connected with compact actuator (9), is connected with turbine fan (10) at left and right sides of two compact actuators (9),
And it is electrically connected between miniature motor (8), compact actuator (9) and turbine fan (10), blackboard eraser main body (1) side
Face insertion is provided with switch button (11),
The blackboard eraser main body (1), which is internally embedded, to be provided with controller (13), and controller (13) and miniature motor (8) are electrically
Connection, and controller (13) is provided with signal receiving end, and Chu Chen mechanism includes dust-collecting cavity (6), separation net (601), dirt is opened
Mouth (602) and fixed card buckle (603),
It is connected with dust-collecting cavity (6) on the right side of the blackboard eraser main body (1), insertion is provided with isolation in the middle part of the dust-collecting cavity (6)
Net (601), and the shape of separation net (601) and turbine fan (10) are unanimously, dust-collecting cavity (6) the side insertion is provided with down
Dirt is open (602), and the opening of falling dirt (602) side is connected with fixed card buckle (603), and walking mechanism includes that intelligence wipes dress
(12), magnetic stripe (1201), small-sized traveling wheel (1202) and angle displacement sensor (1203) are set,
Blackboard eraser main body (1) middle part, which is embedded in, is provided with intelligence wiping device (12), and intelligence wiping device (12) is soft positioned at two
Between cotton rub item (2), the intelligence wipes device (12) by magnetic stripe (1201), small-sized traveling wheel (1202) and angle displacement sensor
(1203) it forms, described intelligence wiping device (12) upper and lower ends, which are embedded in, to be provided with magnetic stripe (1201), and the intelligence wipes device
(12) middle part is connected with small-sized traveling wheel (1202), and small-sized traveling wheel (1202) is respectively positioned on the inside of magnetic stripe (1201),
And traveling wheel (1202) and compact actuator (9) are electrically connected, and insertion is provided with angle in the middle part of the small-sized traveling wheel (1202)
It spends displacement sensor (1203), and angle displacement sensor (1203) is provided with signal output end.
2. small intelligent dust-free black board eraser according to claim 1, which is characterized in that the separation net (601) is in circular arc
Shape, and the arrangement of separation net (601) and turbine fan (10) are consistent.
3. small intelligent dust-free black board eraser according to claim 1, which is characterized in that on the outside of the opening of falling dirt (602)
It is provided with removable cover, and top is provided with card slot.
4. small intelligent dust-free black board eraser according to claim 1, which is characterized in that the fixed card buckle (603) with fall
The card slot that dirt is open in (602) is in fixed engaging shape, and fixed card buckle (603) is set to the activity on the outside of the opening of falling dirt (602)
It covers.
5. small intelligent dust-free black board eraser according to claim 1, which is characterized in that described two magnetic stripes (1201) are presented
Lower symmetry shape, and the height of magnetic stripe (1201) and small-sized traveling wheel (1202) are consistent.
6. small intelligent dust-free black board eraser according to claim 1, which is characterized in that described two small-sized traveling wheels
(1202) it matches, and is provided with small-sized roller bearing in the middle part of two small-sized traveling wheels (1202).
7. small intelligent dust-free black board eraser according to claim 1, which is characterized in that the angle displacement sensor
(1203) signal output end is connect with controller (13) signal receiving end in signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820977157.3U CN208615592U (en) | 2018-06-22 | 2018-06-22 | Small intelligent dust-free black board eraser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820977157.3U CN208615592U (en) | 2018-06-22 | 2018-06-22 | Small intelligent dust-free black board eraser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208615592U true CN208615592U (en) | 2019-03-19 |
Family
ID=65702126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820977157.3U Expired - Fee Related CN208615592U (en) | 2018-06-22 | 2018-06-22 | Small intelligent dust-free black board eraser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208615592U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110641212A (en) * | 2019-11-11 | 2020-01-03 | 江苏斯固信息科技有限公司 | Blackboard eraser capable of absorbing dust |
-
2018
- 2018-06-22 CN CN201820977157.3U patent/CN208615592U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110641212A (en) * | 2019-11-11 | 2020-01-03 | 江苏斯固信息科技有限公司 | Blackboard eraser capable of absorbing dust |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203885430U (en) | Novel cleaning device | |
| CN205107565U (en) | Intelligent robot for sweeping floor | |
| CN208615592U (en) | Small intelligent dust-free black board eraser | |
| CN108357259A (en) | A kind of environmental protection blackboard for education | |
| CN202337152U (en) | Two-side dust removal blackboard eraser | |
| CN106580196A (en) | Novel household cleaning robot | |
| CN202703044U (en) | Dust-absorption type power-driven blackboard eraser | |
| CN203210960U (en) | Rotating-roller type dust-collection eraser | |
| CN207565209U (en) | One kind can positioning full-automatic dust absorption blackboard eraser | |
| CN202557137U (en) | Dust absorption blackboard eraser with internally-installed fan | |
| CN206475648U (en) | A kind of English teaching board | |
| CN205044383U (en) | Energy -conserving blackboard sassafras of dust absorption | |
| CN210553842U (en) | Piezoelectric dust-absorbing blackboard eraser | |
| CN205762878U (en) | A kind of school blackboard wipes cleaning device | |
| CN201633412U (en) | Multi-functional dust collecting box | |
| CN202271734U (en) | Electronic blackboard eraser | |
| CN2328531Y (en) | Dust removing blackboard brush | |
| CN201077291Y (en) | Dust-proof blackboard eraser | |
| CN207842467U (en) | Automatic dust removing eraser | |
| CN207510076U (en) | A kind of teaching aid has the blackboard for education of chalk ash collection function | |
| CN201148080Y (en) | Full-automatic blackboard duster | |
| CN201552925U (en) | Dust collecting blackboard eraser without rope | |
| CN206166836U (en) | Infrared human response cleaning device | |
| CN206030900U (en) | Automatic dust removal blackboard eraser | |
| CN201872493U (en) | Dust collection blackboard eraser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20190319 Termination date: 20200622 |