CN107139610A - A kind of type of push and pull up down high-efficiency self-cleaning blackboard - Google Patents

A kind of type of push and pull up down high-efficiency self-cleaning blackboard Download PDF

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Publication number
CN107139610A
CN107139610A CN201710547275.0A CN201710547275A CN107139610A CN 107139610 A CN107139610 A CN 107139610A CN 201710547275 A CN201710547275 A CN 201710547275A CN 107139610 A CN107139610 A CN 107139610A
Authority
CN
China
Prior art keywords
roller
blackboard
gear
track
push
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.)
Pending
Application number
CN201710547275.0A
Other languages
Chinese (zh)
Inventor
夏华明
张晨旭
刘雷
朱安行
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Anhui University of Science and Technology
Original Assignee
Anhui University of Science and Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Anhui University of Science and Technology filed Critical Anhui University of Science and Technology
Priority to CN201710547275.0A priority Critical patent/CN107139610A/en
Publication of CN107139610A publication Critical patent/CN107139610A/en
Pending legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47BTABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B97/00Miscellaneous furniture; Miscellaneous accessories for furniture
    • A47B97/04Easels or stands for blackboards or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43LARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L1/00Repeatedly-usable boards or tablets for writing or drawing
    • B43L1/04Blackboards
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43LARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L21/00Blackboard or slate cleaning devices

Abstract

The invention discloses a kind of type of push and pull up down high-efficiency self-cleaning blackboard, it is characterized in that:Including device for fixing running tracks, multidimensional transmission device, plate face ash-swabbing device, deashing device and cinder catcher body;Upper and lower roller and chain connecting rod on easel is respectively disposed in the upper and lower track set on the outer framework of left and right and key way and run by the device for fixing running tracks;The multidimensional transmission device is the combination transmission mechanism of gear bar, gear and worm and gear;The plate face ash-swabbing device is rotated by the interconnection of Hooks coupling universal coupling, roller shaft and turbine, then through wedge spring is compressed bearing and made to wipe grey roller thereon and push down blackboard front;The deashing device is moved left and right the quick of deashing hairbrush that be converted into of gear by the cam connection element slided in cam path;Lower section is provided with cinder catcher body.The inner side blackboard that the Self-cleaning blackboard is used needed for need to only pulling down can complete self-cleaning, efficiently convenient, and cleaning effect significantly, and does not influence normal teaching process.

Description

A kind of type of push and pull up down high-efficiency self-cleaning blackboard
Technical field
The present invention relates to teaching aid field, specifically a kind of type of push and pull up down high-efficiency self-cleaning blackboard.
Background technology
In modern teaching, although projecting apparatus is generally used, but classroom professor's used tool is still with blackboard and powder Based on pen, the chalk usage amount especially attended class in first, senior middle school classroom is quite big, and blackboard uses frequent.Even if in present classroom very It is have been equipped with the type of push and pull up down blackboard group with Multiface blackboard more, but after all also will be through teacher or student by chalk per face blackboard It can be reused after person's handwriting wiped clean.The grey minimizing technology of adoptable blackboard pen is generally using the black of hand size at present Blackboard eraser wipes blackboard person's handwriting one by one, but the plate face of required wiping is generally large, time-consuming to take a lot of work, and front erasing chalk writings When easily cause chalk and fly upward, pollute teaching environment.When in addition, due to erasing chalk ash, substantial amounts of pen ash adheres to blackboard Working surface is wiped, easily there is situations such as dust stratification is more, easy-clear is not clean, thus actual wiping effect often also and pays no attention to Think.
Therefore, Chinese patent CN106114015A discloses a kind of self-cleaning crawler belt device for blackboard eraser and its application method. The device makes the snag in box body remove the pen ash on blackboard by manually promoting the box body on blackboard front, and again Snag is cleaned by bristle, makes the device preferable to the cleaning effect of blackboard, cleaning is thorough.But it needs people's work point when cleaning blackboard Repeatedly device lateral is moved, and during longitudinal deashing of every traversing section, deashing section is smaller for whole blackboard surface, whole Individual deashing process is still more bothered, and the deashing time is long.
The content of the invention
The purpose of the present invention is a kind of type of push and pull up down high-efficiency self-cleaning blackboard of design, and the device need not be by by hand using black Blackboard eraser or the secondary repetition erasing blackboard person's handwriting of related board wiping device, only rely on the blackboard needed for push-and-pull above and below faculty The black box formula plate face pen ash erasing work of the blackboard is realized, process is simple, and Stability Analysis of Structures is reliable, efficiently convenient, effective to solve The problem of being mentioned in above-mentioned background technology.
To achieve the above object, the present invention provides following technical scheme:A kind of type of push and pull up down high-efficiency self-cleaning blackboard, bag Include:Device for fixing running tracks, multidimensional transmission device, plate face ash-swabbing device, deashing device and cinder catcher body;The device for fixing running tracks It is that the upper and lower roller and chain connecting rod on easel are respectively disposed on to the upper and lower track and chain set on the outer framework of left and right Run in groove;The multidimensional transmission device is the combination transmission mechanism of gear bar, gear and worm and gear;The plate face wipes ash dress Putting and rotated by the interconnection of Hooks coupling universal coupling, roller shaft and turbine, then compress bearing through wedge spring makes to wipe ash thereon Roller pushes down blackboard front;The deashing device is converted the rotation of gear by the cam connection element slided in cam path For moving left and right for deashing hairbrush;Lower section is provided with cinder catcher body.
Further, the device for fixing running tracks is included in left and right outer framework, set sprocket wheel support shaft mounted thereto Sprocket wheel and chain with sprocket engagement.Upper roller track, bottom roller track, chain rail are designed with the left and right outer framework Each track and gear bar layout on road and gear bar, and left and right outer framework is symmetrical.The left outside frame rail layout On preferably, make the center line of upper roller track and bottom roller track on same vertical curve, and upper roller track is compared with bottom roller Track is wide and shallow, to distinguish upper and lower roller track alternating share, realizes the orderly change rail of each track operation of alternating share.It is described Chain track be placed in the left side of upper and lower roller track, it is and deeper compared with bottom roller track, make upper and lower roller operation it is spacing Outside chain track, it is ensured that three tracks each independent operating and do not interfere situation.The gear bar is placed in bottom roller The right-hand member of track, when blackboard is being run on the track in outside, the gear with convex race is engaged with gear bar, by under Pulling force is converted into power source and makes pinion rotation.The chain is fixed with the chain connecting rod in blackboard in ear mount, and passes through chain Wheel tangles blackboard, while the track run location of two pieces of blackboards is relative to each other above and below making, it is ensured that upper and lower blackboard having in orbit Sort run is without occurring mutual card phenomenon.
Further, the multidimensional transmission device includes being placed in the gear bar of upper and lower roller track right-hand member, nibbled with gear bar Close the gear with convex race, by flat key connect realize with convex race gear fix worm screw and with worm engaging Worm gear.The worm gear is arranged in worm gear ear mount.The multidimensional transmission device passes through with the gear on convex race and close to outer The rotation of gear is realized in the engagement of the gear bar of side, by convex race thereon by convert rotational motion for needed for deashing device Move left and right, the anticlockwise slow-speed of revolution operation needed for ash-swabbing device is realized by the engagement of worm and gear.Described Worm and gear is according to the difference of the direction of rotation of blackboard the right and left, while being divided into two class suitable, counterclockwise, it is ensured that plate face wipes ash dress Put and the operation conditions of deashing device is reasonable.
Further, the ash-swabbing device is including the roller bearing on blackboard base, installed in base and roller Wedge spring, the Hooks coupling universal coupling on roller bearing, the roller turn being connected with Hooks coupling universal coupling of bearing middle part Axle and the grey roller of dustless wiping on roller shaft.The roller shaft is connected by Hooks coupling universal coupling with worm gear axle center Realize and rotate, then be driven step by step by the connection of multiple Hooks coupling universal couplings and multiple roller shafts, finally realize that dustless ash of wiping is rolled The reverse slow-speed of revolution of cylinder rotates blackboard wiping.The dustless ash roller of wiping compresses bearing realization and blackboard front by wedge spring Be close to, it is ensured that each section is wiped the compression of grey roller fully, and pressure is had certain toughness.During the dustless grey roller of wiping is pressurized The Rotary axle center error of generation is eliminated by Hooks coupling universal coupling.It is described it is dustless wipe grey roller built with one layer of soft foam-rubber cushion, Its surface is the dustless wiper with microgroove texture.
Further, the deashing device includes deashing hairbrush, the two sections of deashings in connection left and right being arranged on hairbrush slideway The hairbrush connector of hairbrush and the cam connecting key for associating hairbrush with cam path.When wiping grey roller counter-rotating wiping ash, Deashing hairbrush is run through cam connection element in cam path, and is bilateral reciprocation by its convert rotational motion, is realized to nothing Dirt wipes the deashing work of grey roller.The hairbrush connector is a Flexible Connector.
Further, the cinder catcher body is the rectangular-shape cinder catcher body of a uncapping.The cavity is located at dustless ash of wiping and rolled The lower section of cylinder, the ash discharging hole of cavity is located at cavity bottom surface., will when the chalk dust reserves of cuboid cinder catcher body reach predetermined value The ash discharging hole of the lower end of cuboid cinder catcher body is opened, and is dumped pen ash and is discharged and import dustbin, completes the row of cinder catcher body Ash work.
Advantages of the present invention:
1. dustless ash roller of wiping is close to blackboard surface, and pressure distribution of the grey section of each drum eraser to blackboard is flexible, is pressurized and fills Point and will not excessively, pressure change it is relatively small, wipe effect stability it is reliable.
2. being wiped using the grey roller veneer of the textured dustless wiping of soft band, and use hairbrush secondary cylinder surface The chalk dust of attachment, in addition, same plate face is divided to two groups of dustless grey drum eraser ashes of wiping again, ash-removal effect is good.
3. using the worm-and-wheel gear of high transmission ratio, resistance is small, stable drive.And chain connection mode is used, badly Operating mode ability to bear is strong.
4. the work of erasing blackboard chalk dust is realized at the blackboard back side, and cinder catcher body collects chalk pen at the back side of blackboard Ash, erase process is quiet, dust-separation is good, accomplishes the positive instructional space no dust pollution of blackboard.
5. simple operation, it is desirable to when wiping, the inner side blackboard used needed for need to only pulling down can be automatically performed erasing work, And when wiping only to inner side with it is dustless wipe grey cylinder contact when blackboard front wipe, i.e., above and below the content of blackboard can Exist simultaneously and have certain push-and-pull space up and down, normal teaching process is not influenceed.
Brief description of the drawings
Fig. 1 present invention removes the three dimensional structure diagram of right-hand member outer framework, chain and sprocket wheel
Partial enlarged drawing at Fig. 2 Fig. 1 of the present invention A
Partial enlarged drawing is faced at Fig. 3 Fig. 1 of the present invention A
Partial enlarged drawing at Fig. 4 Fig. 1 of the present invention B
Partial enlarged drawing at Fig. 5 Fig. 1 of the present invention C
Partial enlarged drawing at Fig. 6 Fig. 1 of the present invention D
Partial enlarged drawing is faced at Fig. 7 Fig. 1 of the present invention D
Partial enlarged drawing at Fig. 8 Fig. 1 of the present invention E
Partial enlarged drawing at Fig. 9 Fig. 1 of the present invention F
Half sectional view to the left at the F of Figure 10 present invention
The left outside circuit theory schematic diagram of Figure 11 present invention
The three dimensional structure diagram of Figure 12 present invention
In figure:1st, left outside framework 2, the blackboard back side 3, blackboard framework 4, it is dustless wipe grey roller 5, hairbrush connector 6, Deashing hairbrush 7, upper roller 8, chain connecting rod 9, bottom roller 10, lower kerve 11, worm gear clockwise 12, worm screw clockwise 13rd, band convex race gear 14, cam connection element 15, cinder catcher body 16, chain 17, sprocket wheel 18, middle ear mount 19, sprocket wheel It is groove 20, sprocket wheel support shaft 21, roller bearing 22, worm screw counterclockwise 23, worm gear counterclockwise 24, worm gear ear mount 25, universal Shaft coupling 26, roller shaft 27, hairbrush slideway 28, wedge spring 29, upper roller track 30, gear bar 31, bottom roller Track 32, chain track 33, gear switching band 34, bracket base
Embodiment
The present invention is described further with reference to specific embodiment.
Reference picture 1, the present invention is a kind of type of push and pull up down high-efficiency self-cleaning blackboard, including:Device for fixing running tracks, multidimensional transmission Device, plate face ash-swabbing device, deashing device and cinder catcher body.The device for fixing running tracks includes left outside framework 1, right outer frame frame, Sprocket wheel in the sprocket wheel support shaft that outer framework is provided with and the chain with sprocket engagement.Reference picture 11 and Figure 10, institute State and upper roller track 29, bottom roller track 31, chain track 32 and gear bar 30 are designed with left and right outer framework, and it is left and right outer Each track and gear bar layout on framework is symmetrical.On the rail layout of the left outside framework 1 preferably, upper roller is made The center line of track 29 and bottom roller track 31 is on same vertical curve, and upper roller track 29 is compared with the track of bottom roller track 31 It is wide and shallow, to distinguish the alternating share of upper roller track 29 and bottom roller track 31, realize the orderly change rail of alternating share operation. Described chain track 32 is placed in the left side of upper roller track 29 and bottom roller track 31, and deeper compared with bottom roller track 31, makes The operation of upper roller 7 and bottom roller 9 is spacing outside chain track 31, it is ensured that three tracks independent operating and are not done each Relate to situation.The gear bar 30 be placed in above and below roller track right-hand member, when blackboard framework 3 close to outside track on run When, the gear 13 with convex race is engaged with gear bar 30, and lower pulling force is converted into power source and gear 13 is rotated.The chain Bar 16 is fixed with the chain connecting rod 8 in ear mount in blackboard 18, and tangles blackboard by the sprocket wheel 17, while making upper and lower two The track run location of block blackboard is relative to each other, it is ensured that the orderly function of upper and lower blackboard in orbit.
Reference picture 1-7 and Figure 10, the multidimensional transmission device include be placed in upper and lower roller track right-hand member gear bar 30, The gear 13 with convex race engaged with gear bar 30, the snail that realization is connected by flat key and fixed with convex race gear 13 Bar 12 (22) and the worm gear 11 (23) engaged with worm screw 12 (22).The worm gear 11 (23) is arranged in worm gear ear mount 24.It is described Multidimensional transmission device realizes the rotation of gear 13 by the gear 13 with convex race with engaging for the gear bar 30 close to outside, Convert rotational motion being moved left and right for quick needed for deashing device by convex race thereon, by worm gear 11 (23) and The reverse slow-speed of revolution operation needed for ash-swabbing device is realized in the engagement of worm screw 12 (22).Described worm gear 11 (23) and worm screw 12 (22) According to the difference of the direction of rotation of blackboard the right and left, while being divided into the class of worm and gear group two suitable, counterclockwise, to ensure to wipe grey dress Put and the running status of deashing device is reasonable.
Reference picture 1 and Fig. 9-10, the plate face ash-swabbing device include roller bearing 21, the peace being arranged on bracket base 34 Wedge spring 28 mounted in bracket base 34 Yu the middle part of roller bearing 21, the Hooks coupling universal coupling on roller bearing 21 25th, the roller shaft 26 being connected with Hooks coupling universal coupling 25 and the grey roller 4 of the dustless wiping on roller shaft 26.The rolling Cylinder rotating shaft 26 be connected with worm gear 11 (23) realizes rotation, and is driven step by step by multiple Hooks coupling universal couplings 25 and gives each roller shaft 26, finally realize the backwards rotation blackboard wiping in the dustless relative movement direction for wiping grey roller 4.The dustless ash roller 4 of wiping leads to Cross wedge spring 28 and compress roller bearing 21 and realize and blackboard is positive is close to, it is ensured that each section of compression for wiping grey roller 4 it is abundant and Make pressure that there is certain toughness.The dustless Rotary axle center error produced during grey roller 4 is pressurized of wiping is given by Hooks coupling universal coupling 26 Eliminate.The dustless ash roller 4 of wiping is built with one layer of soft foam-rubber cushion, and its surface is the dustless wiper with microgroove texture.
Reference picture 6 and Fig. 9-10, the deashing device are clear including the deashing hairbrush 6 on hairbrush slideway 27, connection The hairbrush connector 5 of grey hairbrush 6 and the cam connecting key 14 for associating hairbrush 6 with cam path.Relative shifting is done when wiping grey roller 4 When ash is wiped in dynamic direction counter-rotating, the wiping face of the grey roller 4 of dustless wiping contacted with blackboard surface 2 is constantly updated, and makes dustless roller 4 The deashing face always clean state that wiping face is used.Meanwhile, when the dustless grey roller 4 of wiping rotates, by the continuous of deashing hairbrush 6 The reciprocal fast brushing in left and right removes rolling drum surface, dust thereon is fallen into the cinder catcher body of lower section, realizes and wipes the clear of grey roller to dustless Ash work.The hairbrush connector 5 is a Flexible Connector.
Reference picture 2 and Fig. 6, the cinder catcher body are the rectangular-shape cinder catcher body of a uncapping.The cavity is located at dustless wipe The lower section of grey roller 4, the ash discharging hole of cavity is located at cavity bottom surface.When the chalk dust reserves of cuboid cinder catcher body 15 reach predetermined During value, the ash discharging hole of the bottom surface of cuboid cinder catcher body 15 is opened, pen ash is dumped and discharges and import dustbin, collection ash is completed The ash discharge work of cavity 15.
Simple operation of the present invention, it is desirable to when wiping, the inner side blackboard used needed for only above need to pushing away or pull down can complete institute Need the erasing work of blackboard, and the inside and outside lateral incision for carrying out blackboard is when changing, push-and-pull up and down can be with to bottom or top slightly surplus energy Track is automatically performed switch operating.When being not intended to erasing, the content of blackboard can exist simultaneously up and down, and inner side blackboard also has about The push-and-pull space up and down of each track 1/3rd is accounted for, normal teaching process is not interfered with.

Claims (7)

1. a kind of type of push and pull up down high-efficiency self-cleaning blackboard, it is characterized in that:Including device for fixing running tracks, multidimensional transmission device, plate face Ash-swabbing device, deashing device and cinder catcher body;The device for fixing running tracks is by the upper and lower roller and chain connecting rod on easel It is respectively disposed in the upper and lower track set on the outer framework of left and right and key way and runs;The multidimensional transmission device is gear bar, tooth The combination transmission mechanism of wheel and worm and gear;The phase that the plate face ash-swabbing device passes through Hooks coupling universal coupling, roller shaft and worm gear Connect rotation, then through wedge spring compress bearing and make to wipe grey roller thereon and push down blackboard front;The deashing device by The cam connection element slided in cam path, moving left and right for deashing hairbrush is converted into by gear;Lower section is provided with cinder catcher Body.
2. type of push and pull up down high-efficiency self-cleaning blackboard according to claim 1, it is characterized in that:The left outside frame rail layout On preferably, make the center line of upper roller track and bottom roller track on same vertical curve, and upper roller track is compared with bottom roller Track is wide and shallow, to distinguish upper and lower roller track alternating share, realizes the orderly change rail of each track operation of alternating share.It is described Chain track be placed in the left side of upper and lower roller track, it is and deeper compared with bottom roller track, make upper and lower roller operation it is spacing Outside chain track, it is ensured that three tracks each independent operating and do not interfere situation.
3. type of push and pull up down high-efficiency self-cleaning blackboard according to claim 1, it is characterized in that:The chain and ear mount in blackboard On chain connecting rod fix, and blackboard is tangled by the sprocket wheel, at the same above and below making two pieces of blackboards track run location that This is related, it is ensured that the orderly function of upper and lower blackboard in orbit is without occurring mutual card phenomenon.
4. type of push and pull up down high-efficiency self-cleaning blackboard according to claim 1, it is characterized in that:The multidimensional transmission device passes through The rotation of gear is realized with engage for the gear bar close to outside with the gear on convex race, passes through convex race general thereon Convert rotational motion realizes ash-swabbing device institute for the left and right faster reciprocal motion needed for deashing device by the engagement of worm and gear The reverse slow-speed of revolution campaign needed.
5. type of push and pull up down high-efficiency self-cleaning blackboard according to claim 1, it is characterized in that:The dustless ash roller of wiping passes through Wedge spring compresses bearing and realized and blackboard is positive is close to, it is ensured that each section of compression for wiping grey roller is abundant, and has pressure Certain toughness.The dustless axis for wiping each axle center produced during grey roller is pressurized is inconsistent to be disappeared by Hooks coupling universal coupling Remove.
6. type of push and pull up down high-efficiency self-cleaning blackboard according to claim 1, it is characterized in that:The grey roller of dustless wiping is built-in There is one layer of relatively soft foam-rubber cushion, its surface has the dustless wiper with microgroove texture.
7. type of push and pull up down high-efficiency self-cleaning blackboard according to claim 1, it is characterized in that:Wiped when wiping grey roller counter-rotating When grey, the grey drum eraser face of dustless wiping contacted with blackboard is constantly updated, and the deashing face for using dustless drum eraser face is always clean Net state.Meanwhile, when dustless wiping ash roller rotates, brush by the continuous left and right of deashing hairbrush is back and forth quickly mobile on rolling drum surface Dust, realize and the dustless deashing for wiping grey roller worked.
CN201710547275.0A 2017-07-06 2017-07-06 A kind of type of push and pull up down high-efficiency self-cleaning blackboard Pending CN107139610A (en)

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CN201710547275.0A CN107139610A (en) 2017-07-06 2017-07-06 A kind of type of push and pull up down high-efficiency self-cleaning blackboard

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Application Number Priority Date Filing Date Title
CN201710547275.0A CN107139610A (en) 2017-07-06 2017-07-06 A kind of type of push and pull up down high-efficiency self-cleaning blackboard

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110194014A (en) * 2018-11-23 2019-09-03 潍坊工商职业学院 Drawing blackboard Special dustless blackboard eraser

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JPS57185593U (en) * 1981-05-22 1982-11-25
JPS6352564A (en) * 1986-08-22 1988-03-05 Canon Inc Picture read display device
JP2001088495A (en) * 1999-09-24 2001-04-03 Brother Ind Ltd Notifying equipment with image reading device
CN2635383Y (en) * 2003-08-26 2004-08-25 黄坤平 Self erasing blackboard
JP2005022274A (en) * 2003-07-03 2005-01-27 Matsushita Electric Ind Co Ltd Electronic blackboard
CN201304810Y (en) * 2008-10-17 2009-09-09 王彭 Blackboard
CN201808341U (en) * 2010-09-27 2011-04-27 徐陈晰 Movable blackboard capable of automatically wiping
CN202608341U (en) * 2012-03-08 2012-12-19 罗奕永 Circulating type double-layer self-erasing blackboard
CN203995280U (en) * 2014-08-04 2014-12-10 石家庄科达文教用品有限公司 Type of push and pull up down clipboard and combination clipboard thereof

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57185593U (en) * 1981-05-22 1982-11-25
JPS6352564A (en) * 1986-08-22 1988-03-05 Canon Inc Picture read display device
JP2001088495A (en) * 1999-09-24 2001-04-03 Brother Ind Ltd Notifying equipment with image reading device
JP2005022274A (en) * 2003-07-03 2005-01-27 Matsushita Electric Ind Co Ltd Electronic blackboard
CN2635383Y (en) * 2003-08-26 2004-08-25 黄坤平 Self erasing blackboard
CN201304810Y (en) * 2008-10-17 2009-09-09 王彭 Blackboard
CN201808341U (en) * 2010-09-27 2011-04-27 徐陈晰 Movable blackboard capable of automatically wiping
CN202608341U (en) * 2012-03-08 2012-12-19 罗奕永 Circulating type double-layer self-erasing blackboard
CN203995280U (en) * 2014-08-04 2014-12-10 石家庄科达文教用品有限公司 Type of push and pull up down clipboard and combination clipboard thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110194014A (en) * 2018-11-23 2019-09-03 潍坊工商职业学院 Drawing blackboard Special dustless blackboard eraser

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Application publication date: 20170908