CN108859511A - A kind of turnover type dust-separation blackboard - Google Patents

A kind of turnover type dust-separation blackboard Download PDF

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Publication number
CN108859511A
CN108859511A CN201810598498.4A CN201810598498A CN108859511A CN 108859511 A CN108859511 A CN 108859511A CN 201810598498 A CN201810598498 A CN 201810598498A CN 108859511 A CN108859511 A CN 108859511A
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CN
China
Prior art keywords
plate face
blackboard
frame
separation
erasing
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Pending
Application number
CN201810598498.4A
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Chinese (zh)
Inventor
贾石硕
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贾石硕
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Application filed by 贾石硕 filed Critical 贾石硕
Priority to CN201810598498.4A priority Critical patent/CN108859511A/en
Publication of CN108859511A publication Critical patent/CN108859511A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
    • B43L1/04—Blackboards
    • 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

Abstract

The present invention discloses a kind of turnover type dust-separation blackboard, frame side is equipped with first and writes plate face, frame side is equipped with the first turnover board, first turnover board and frame side are hinged, it is formed with the second writing plate face on the inside of first turnover board, is formed with the first erasing space between the second writing plate face and the first writing plate face；Frame other side is equipped with third and writes plate face, the frame other side opposite with the first turnover board is equipped with the second turnover board, second turnover board and frame other side are hinged, the 4th writing plate face is formed on the inside of second turnover board, the 4th writing plate face and third, which are write, is formed with the second erasing space between plate face.The present invention can not only realize the fold of blackboard, and the writing plate face of blackboard is capable of forming closed erasing space, and the process of erasing avoids dust from being directly entered atmospheric environment, is conducive to the health of student and teacher, two writing plate faces can also be once removed simultaneously, improve blackboard efficiency of erasing.

Description

A kind of turnover type dust-separation blackboard
Technical field
The present invention relates to a kind of blackboards, more particularly to a kind of turnover type dust-separation blackboard.
Background technique
Blackboard is the teaching aid of school's indispensability, carries out writing on the blackboard for teacher.Existing blackboard is usually individually fixed Plate face or the plate face for using slidingtype.After blackboard writing is full, wiped by blackboard eraser, current blackboard is in erasing In the process, the plate face of erasing must be exposed in external environment, and the dust generated after erasing enters directly into environment, influences to teach The health of teacher and student.And an erasing move can only clear up a blackboard panel, and efficiency of erasing is low.
The Chinese patent of Publication No. CN202573486U discloses a kind of multilayer turnover type blackboard, including fixed blackboard, Two part of blackboard is turned down, fixed blackboard is equipped with mural painting；Fold blackboard is connected by loose-leaf with fixed blackboard；Fixed blackboard and It is respectively equipped with magnetic or adhesion device on fold blackboard, the area and function of blackboard greatly improve.Although the technical solution is realized The fold of plate face, but in erase process, plate face must be exposed in external environment, and dust is directly entered atmospheric environment, and And it can only once wipe a plate face, low efficiency.
Summary of the invention
The present invention can not only realize blackboard in view of the deficienciess of the prior art, provide a kind of turnover type dust-separation blackboard Fold, and the writing plate face of blackboard is capable of forming closed erasing space, and the process of erasing avoids dust from being directly entered greatly Compression ring border, while two writing plate faces can also be once removed, it is high-efficient.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of turnover type dust-separation blackboard, the blackboard include Frame, the frame side are equipped with first and write plate face, and frame side is equipped with the first turnover board, first turnover board and frame Side is hinged, and the second writing plate face is formed on the inside of the first turnover board, is formed between the second writing plate face and the first writing plate face There is the first erasing space；The frame other side is equipped with third and writes plate face, the frame opposite with the first turnover board other one Side is equipped with the second turnover board, and second turnover board and frame other side are hinged, is formed with the Four Books on the inside of the second turnover board Plate face is write, the 4th writing plate face and third are write and be formed with the second erasing space between plate face.
A kind of turnover type dust-separation blackboard as described above, first erasing space two sides are equipped with the first slideway, and first wipes Except space interior is equipped with the first bristle brush wheel, the first bristle brush wheel two sides are extend into inside the first slideway, and the first bristle brush wheel is sliding along first Road, which moves up and down, wipes the first writing plate face and the second writing plate face.When needing to wipe, the first fold is closed Plate, to form the first erasing space between the second writing plate face and the first writing plate face, the first bristle brush wheel passes through the first slideway It moves up and down, the first bristle brush wheel writes plate face, the second clipboard face contact with first simultaneously in motion process, and then realizes to the It is wiped while one writing plate face and the second writing plate face, the dust generated in erase process cannot directly enter atmospheric environment.
A kind of turnover type dust-separation blackboard as described above, second erasing space two sides are equipped with the second slideway, and second wipes Except space interior is equipped with the second bristle brush wheel, the second bristle brush wheel two sides are extend into inside the second slideway, and the second bristle brush wheel is sliding along second Road, which moves up and down, wipes third writing plate face and the 4th writing plate face.When needing to wipe, the second fold is closed Plate, so that third, which is write, forms the second erasing space between plate face and the 4th writing plate face, the second bristle brush wheel passes through the second slideway It moves up and down, the second bristle brush wheel writes plate face with third simultaneously in motion process, the 4th writing plate face contacts, and then realizes to the It is wiped while three writing plate faces and the 4th writing plate face, the dust generated in erase process cannot directly enter atmospheric environment.
A kind of turnover type dust-separation blackboard as described above, the axis of the bristle brush wheel stretch out the outside of the frame, bristle brush wheel Axis on the outside of be connected with actuator.Push-and-pull can be used using manual mode by the way of manual and electronic in actuator Bar or rope realize the sliding of bristle brush wheel, and electronic mode can drive bristle brush wheel to roll by the way of motor, gear or belt.
A kind of turnover type dust-separation blackboard as described above, the first erasing space bottom are equipped with the first ash discharging hole, and first Ash discharging hole is distributed with first and leads grey hole to lower recess, the first ash discharging hole bottom.First wipes the dust in space in the work of gravity Enter the first ash discharging hole with falling, since the first ash discharging hole is convenient for dust accumulation to lower recess, dust after aggregation enters the One leads grey hole.
A kind of turnover type dust-separation blackboard as described above, first ash discharging hole are led under grey hole connection frame through described first The first stroke ash-pit of side, the first stroke ash-pit lower part is in contraction-like.The dust collection of grey hole discharge is led in the first stroke ash-pit from first In, the first stroke ash-pit is designed as detachable, is convenient to clean dust.
A kind of turnover type dust-separation blackboard as described above, the second erasing space bottom are equipped with the second ash discharging hole, and second Ash discharging hole is distributed with second and leads grey hole to lower recess, the second ash discharging hole bottom.Second wipes the dust in space in the work of gravity Enter the second ash discharging hole with falling, since the second ash discharging hole is convenient for dust accumulation to lower recess, dust after aggregation enters the Two lead grey hole.
A kind of turnover type dust-separation blackboard as described above, second ash discharging hole are led under grey hole connection frame through described second Second ash-pit of side, second ash-pit lower part is in contraction-like.The dust collection of grey hole discharge is led in second ash-pit from second In, second ash-pit is designed as detachable, is convenient to clean dust.
A kind of turnover type dust-separation blackboard as described above is equipped between the first erasing space and the second erasing space and throws Shadow face.Perspective plane can be used for the multimedia projector projection in classroom, while realizing multimedia teaching, additionally it is possible to carry out plate Book.
The beneficial effects of the invention are as follows：Frame side is equipped with first and writes plate face, and frame side is equipped with the first turnover board, the One turnover board and frame side are hinged, and the second writing plate face is formed on the inside of the first turnover board, and second writes plate face and the first book It writes and is formed with the first erasing space between plate face；Frame other side is equipped with third and writes plate face, opposite with the first turnover board Frame other side is equipped with the second turnover board, and the second turnover board and frame other side are hinged, is formed on the inside of the second turnover board 4th writes plate face, and the 4th writing plate face and third are write and be formed with the second erasing space between plate face.The present invention can not only Realize the fold of blackboard, and the writing plate face of blackboard is capable of forming closed erasing space, the process of erasing avoids dust straight The health for being conducive to student and teacher into atmospheric environment is tapped into, while can also once remove two writing plate faces, is improved black Plate efficiency of erasing.
Detailed description of the invention
Fig. 1 is turnover type dust-separation blackboard structure schematic diagram in embodiment；
Fig. 2 is to remove the turnover type dust-separation blackboard structure schematic diagram after a turnover board in embodiment；
Fig. 3 is the section schematic diagram of erasing space center's line in turnover type dust-separation blackboard edge in embodiment；
Fig. 4 is turnover type dust-separation blackboard partial enlargement diagram in embodiment.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited by the specific embodiments disclosed below.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more Any and all combinations of relevant listed item.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, a kind of turnover type dust-separation blackboard, the blackboard include frame 1, the frame 1 Side is equipped with first and writes plate face 2, and 1 side of frame is equipped with the first turnover board 3, and first turnover board 3 is cut with scissors with 1 side of frame It connects, the second writing plate face 4 is formed on the inside of the first turnover board 3, is formed between the second writing plate face 4 and the first writing plate face 2 First erasing space 5；1 other side of frame is equipped with third and writes plate face 6, and the frame 1 opposite with the first turnover board 3 is in addition Side is equipped with the second turnover board 7, and second turnover board 7 and 1 other side of frame are hinged, are formed on the inside of the second turnover board 7 4th writes plate face 8, and the 4th writing plate face 8 and third are write and be formed with the second erasing space 9 between plate face 6.
In one embodiment of turnover type dust-separation blackboard, it is described first erasing 5 two sides of space be equipped with the first slideway 10, first It wipes and is equipped with the first bristle brush wheel 11 inside space 5,11 two sides of the first bristle brush wheel are extend into inside the first slideway 10, the first bristle brush wheel 11 move up and down along the first slideway 10 wipes the first writing plate face 2 and the second writing plate face 4.When needing to wipe When, the first turnover board 3 is closed, so that the first erasing space 5 is formed between the second writing plate face 4 and the first writing plate face 2, first Bristle brush wheel 11 is moved up and down by the first slideway 10, and the first bristle brush wheel 11 writes plate face 2, second with first simultaneously in motion process It wipes while writing plate face 4 to contact, and then realize to the first writing plate face 2 and the second writing plate face 4, is generated in erase process Dust cannot directly enter atmospheric environment.
In one embodiment of turnover type dust-separation blackboard, it is described second erasing 9 two sides of space be equipped with the second slideway 12, second It wipes and is equipped with the second bristle brush wheel 13 inside space 9,13 two sides of the second bristle brush wheel are extend into inside the second slideway 12, the second bristle brush wheel 13 move up and down along the second slideway 12 wipes third writing plate face 6 and the 4th writing plate face 8.When needing to wipe When, the second turnover board 7 is closed, so that third, which is write, forms the second erasing space 9 between plate face 6 and the 4th writing plate face 8, second Bristle brush wheel 13 is moved up and down by the second slideway 12, and the second bristle brush wheel 13 writes plate face the 6, the 4th with third simultaneously in motion process It writes plate face 8 to contact, and then realizes and wiped while writing plate face 6 and the 4th writing plate face 8 to third, generated in erase process Dust cannot directly enter atmospheric environment.
In one embodiment of turnover type dust-separation blackboard, the axis of the bristle brush wheel stretches out the outside of the frame 1, bristle brush wheel Axis on the outside of be connected with actuator 14.Actuator 14 can be can be used by the way of manual and electronic using manual mode Push-pull rod or rope realize the sliding of bristle brush wheel, and electronic mode can drive bristle brush wheel by the way of motor, gear or belt It rolls.
In one embodiment of turnover type dust-separation blackboard, first erasing, 5 bottom of space is equipped with the first ash discharging hole 15, the To lower recess, 15 bottom of the first ash discharging hole is distributed with first and leads grey hole 16 one ash discharging hole 15.Dust in first erasing space 5 exists It falls under the action of gravity and enters the first ash discharging hole 15, since the first ash discharging hole 15 is convenient for dust accumulation to lower recess, after aggregation Dust enter and first lead grey hole 16.First ash discharging hole 15 leads the first of grey 1 downside of the connection of hole 16 frame through described first Ash-pit 17,17 lower part of the first stroke ash-pit is in contraction-like.The dust collection of the grey discharge of hole 16 is led in the first stroke ash-pit 17 from first In, the first stroke ash-pit 17 is designed as detachable, is convenient to clean dust.
In one embodiment of turnover type dust-separation blackboard, second erasing, 9 bottom of space is equipped with the second ash discharging hole 18, the To lower recess, 18 bottom of the second ash discharging hole is distributed with second and leads grey hole 19 two ash discharging holes 18.Dust in second erasing space 9 exists It falls under the action of gravity and enters the second ash discharging hole 18, since the second ash discharging hole 18 is convenient for dust accumulation to lower recess, after aggregation Dust enter and second lead grey hole 19.Second ash discharging hole 18 leads the second of grey 1 downside of the connection of hole 19 frame through described second Ash-pit 20, second 20 lower part of ash-pit is in contraction-like.The dust collection of the grey discharge of hole 19 is led in second ash-pit 20 from second In, second ash-pit 20 is designed as detachable, is convenient to clean dust.
In one embodiment of turnover type dust-separation blackboard, it is equipped between the first erasing space 5 and the second erasing space 9 Perspective plane 21.Perspective plane 21 can be used for the multimedia projector projection in classroom, while realizing multimedia teaching, additionally it is possible into Andante book.
The present invention when needing to wipe, close the first turnover board 3, thus second write plate face 4 with first writing plate face 2 it Between form the first erasing space 5, the first bristle brush wheel 11 is by the up and down motion of the first slideway 10, the first bristle brush wheel 11 in motion process Plate face 4 is write with the first writing plate face 2, second simultaneously to contact, and then realizes that writing plate face 2 and second to first writes plate face 4 While wipe；The second turnover board 7 is closed, so that third, which writes plate face 6 and the 4th, writes the second erasing of formation sky between plate face 8 Between 9, the second bristle brush wheel 13 is moved up and down by the second slideway 12, in motion process the second bristle brush wheel 13 simultaneously with third clipboard Face the 6, the 4th is write plate face 8 and is contacted, and then realizes and wipe while writing plate face 6 and the 4th writing plate face 8 to third, wipes The dust generated in journey cannot directly enter atmospheric environment.Dust in first erasing space 5 is dropped into down under gravity Enter the first ash discharging hole 15, since the first ash discharging hole 15 is convenient for dust accumulation to lower recess, the dust after aggregation enters first and leads ash Dust collection that grey hole 19 is discharged is led in second ash-pit 20 from second in hole 16, second ash-pit 20 be designed as it is detachable, It is convenient to clean dust.Equally, the dust in the second erasing space 9 falls under gravity enters the second ash discharging hole 18, by It is convenient for dust accumulation to lower recess in the second ash discharging hole 18, the dust after aggregation enters second and leads grey hole 19, leads grey hole from second In second ash-pit 20, second ash-pit 20 is designed as detachable the dust collections of 19 discharges, is convenient to clean dust.This hair The bright fold that can not only realize blackboard, and the writing plate face of blackboard is capable of forming closed erasing space, the process of erasing It avoids dust from being directly entered atmospheric environment, is conducive to the health of student and teacher, while can also once remove two writings Plate face improves blackboard efficiency of erasing.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.

Claims (9)

1. a kind of turnover type dust-separation blackboard, the blackboard includes frame (1), it is characterised in that：Frame (1) side is equipped with the One writes plate face (2), and frame (1) side is equipped with the first turnover board (3), and first turnover board (3) and frame (1) side are cut with scissors Connect, be formed with the second writing plate face (4) on the inside of the first turnover board (3), second write plate face (4) with first write plate face (2) it Between be formed with the first erasing space (5)；Frame (1) other side is equipped with third and writes plate face (6), with the first turnover board (3) opposite frame (1) other side is equipped with the second turnover board (7), second turnover board (7) and frame (1) other side Hingedly, the 4th writing plate face (8) is formed on the inside of the second turnover board (7), the 4th writes plate face (8) and third writing plate face (6) Between be formed with the second erasing space (9).
2. a kind of turnover type dust-separation blackboard according to claim 1, it is characterised in that：First erasing space (5) two Side is equipped with the first slideway (10), is equipped with the first bristle brush wheel (11) inside the first erasing space (5), the first bristle brush wheel (11) two sides are stretched Enter to the first slideway (10) inside, the first bristle brush wheel (11) is along the first slideway (10) up and down motion to the first writing plate face (2) it is wiped with the second writing plate face (4).
3. a kind of turnover type dust-separation blackboard according to claim 1, it is characterised in that：Second erasing space (9) two Side is equipped with the second slideway (12), is equipped with the second bristle brush wheel (13) inside the second erasing space (9), the second bristle brush wheel (13) two sides are stretched Enter to the second slideway (12) inside, the second bristle brush wheel (13) is along the second slideway (12) up and down motion to third writing plate face (6) it is wiped with the 4th writing plate face (8).
4. a kind of turnover type dust-separation blackboard according to claim 2 or 3, it is characterised in that：The axis of the bristle brush wheel stretches out The axis outside in the outside of the frame (1), bristle brush wheel is connected with actuator (14).
5. a kind of turnover type dust-separation blackboard according to claim 1, it is characterised in that：First erasing space (5) bottom Portion is equipped with the first ash discharging hole (15), and the first ash discharging hole (15) is distributed with first and leads ash to lower recess, the first ash discharging hole (15) bottom Hole (16).
6. a kind of turnover type dust-separation blackboard according to claim 5, it is characterised in that：First ash discharging hole (15) is through institute It states first and leads the first stroke ash-pit (17) that grey hole (16) are connected on the downside of frame (1), the first stroke ash-pit (17) lower part is in contraction-like.
7. a kind of turnover type dust-separation blackboard according to claim 1, it is characterised in that：Second erasing space (9) bottom Portion is equipped with the second ash discharging hole (18), and the second ash discharging hole (18) is distributed with second and leads ash to lower recess, the second ash discharging hole (18) bottom Hole (19).
8. a kind of turnover type dust-separation blackboard according to claim 7, it is characterised in that：Second ash discharging hole (18) is through institute It states second and leads second ash-pit (20) that grey hole (19) are connected on the downside of frame (1), second ash-pit (20) lower part is in contraction-like.
9. a kind of turnover type dust-separation blackboard according to claim 1, it is characterised in that：It is described first erasing space (5) and Perspective plane (21) are equipped between second erasing space (9).
CN201810598498.4A 2018-06-12 2018-06-12 A kind of turnover type dust-separation blackboard Pending CN108859511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810598498.4A CN108859511A (en) 2018-06-12 2018-06-12 A kind of turnover type dust-separation blackboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810598498.4A CN108859511A (en) 2018-06-12 2018-06-12 A kind of turnover type dust-separation blackboard

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CN108859511A true CN108859511A (en) 2018-11-23

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JP2002254891A (en) * 2000-12-27 2002-09-11 Kokuyo Co Ltd Writing board
CN201376422Y (en) * 2009-03-16 2010-01-06 侯畅 Novel blackboard
CN201769540U (en) * 2010-04-07 2011-03-23 张毅 Switch type blackboard capable of carrying out automatic erasure
CN201849154U (en) * 2010-11-05 2011-06-01 浙江大学 Folding multifunctional blackboard
CN202716627U (en) * 2012-08-01 2013-02-06 济南蓝贝思特科技有限公司 Dust-free environment-friendly combined multi-media teaching board
KR20140076439A (en) * 2012-12-12 2014-06-20 황병수 camera and screen display that describe a chalkboard
CN203752742U (en) * 2014-03-06 2014-08-06 攀枝花学院 Double-layer folding blackboard
CN204774248U (en) * 2015-07-16 2015-11-18 杨柳 What be adapted to two class lyceums prevents that reflection of light is from erasing blackboard
CN204801319U (en) * 2015-06-24 2015-11-25 孙嘉毅 Push -and -pull blackboard with self -lock device
CN204936600U (en) * 2015-09-11 2016-01-06 李志刚 A kind of removable clean blackboard
CN205075522U (en) * 2015-10-21 2016-03-09 长春职业技术学院（长春市职业技术教育中心长春市财政学校） Novel multi -functional blackboard that teaching was used
CN206322332U (en) * 2016-08-30 2017-07-11 天津市府易科技有限公司 A kind of multifunction teaching all-in-one
CN107599685A (en) * 2017-09-14 2018-01-19 周翔 A kind of packaged type blackboard for teaching
CN107962900A (en) * 2017-10-18 2018-04-27 无锡艾科瑞思产品设计与研究有限公司 A kind of packaged type electric erasing blackboard for education

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002254891A (en) * 2000-12-27 2002-09-11 Kokuyo Co Ltd Writing board
CN201376422Y (en) * 2009-03-16 2010-01-06 侯畅 Novel blackboard
CN201769540U (en) * 2010-04-07 2011-03-23 张毅 Switch type blackboard capable of carrying out automatic erasure
CN201849154U (en) * 2010-11-05 2011-06-01 浙江大学 Folding multifunctional blackboard
CN202716627U (en) * 2012-08-01 2013-02-06 济南蓝贝思特科技有限公司 Dust-free environment-friendly combined multi-media teaching board
KR20140076439A (en) * 2012-12-12 2014-06-20 황병수 camera and screen display that describe a chalkboard
CN203752742U (en) * 2014-03-06 2014-08-06 攀枝花学院 Double-layer folding blackboard
CN204801319U (en) * 2015-06-24 2015-11-25 孙嘉毅 Push -and -pull blackboard with self -lock device
CN204774248U (en) * 2015-07-16 2015-11-18 杨柳 What be adapted to two class lyceums prevents that reflection of light is from erasing blackboard
CN204936600U (en) * 2015-09-11 2016-01-06 李志刚 A kind of removable clean blackboard
CN205075522U (en) * 2015-10-21 2016-03-09 长春职业技术学院（长春市职业技术教育中心长春市财政学校） Novel multi -functional blackboard that teaching was used
CN206322332U (en) * 2016-08-30 2017-07-11 天津市府易科技有限公司 A kind of multifunction teaching all-in-one
CN107599685A (en) * 2017-09-14 2018-01-19 周翔 A kind of packaged type blackboard for teaching
CN107962900A (en) * 2017-10-18 2018-04-27 无锡艾科瑞思产品设计与研究有限公司 A kind of packaged type electric erasing blackboard for education

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