CN108501584A - A kind of blackboard cleaning device - Google Patents
A kind of blackboard cleaning device Download PDFInfo
- Publication number
- CN108501584A CN108501584A CN201810629990.3A CN201810629990A CN108501584A CN 108501584 A CN108501584 A CN 108501584A CN 201810629990 A CN201810629990 A CN 201810629990A CN 108501584 A CN108501584 A CN 108501584A
- Authority
- CN
- China
- Prior art keywords
- pipe
- blackboard
- sliding block
- guide rail
- hot wind
- 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.)
- Granted
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 230000002745 absorbent Effects 0.000 claims abstract description 16
- 239000002250 absorbent Substances 0.000 claims abstract description 16
- 210000002268 wool Anatomy 0.000 claims abstract description 16
- 239000002351 wastewater Substances 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 5
- 238000001035 drying Methods 0.000 abstract description 7
- 230000008439 repair process Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000005337 ground glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L21/00—Blackboard or slate cleaning devices
- B43L21/02—Blackboard or slate cleaning devices with means for absorbing the chalk dust
Landscapes
- Drawing Aids And Blackboards (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention belongs to a kind of blackboard cleaning devices, blackboard on both sides have guide rail, there is gutter channel on guide rail side, gutter channel left end has waste water box, there is sliding block in guide rail, there are drawstring in sliding block both sides, plane is fluted on sliding block, there is hot wind plate in groove, there is sink between top shoe and sliding block, bottom of gullet has leakage hole, there is leak pipe in leakage hole, leak pipe is connected with snap-gauge, there is absorbent wool in snap-gauge, supporting rod is arranged at hot wind plate top, there is shaft in supporting rod, there is pressing plate in shaft, there are connecting plate in pressing plate both sides, there are water inlet pipe and outlet pipe in sink upper end, there is circulation pipe in sink lower end；There is bearing block on the wall of guide rail left and right sides, rotary shaft is connected in bearing, rotary shaft has driving motor, water inlet pipe and outlet pipe to be connected with circulating pump, and circulating pump is connected with water storage case, and blast pipe is connected with fan heater；The configuration of the present invention is simple, it is easy to repair, and dried using hot wind after being cleaned to blackboard, the blackboard after drying can be write immediately, do not interfere with teaching and use.
Description
Technical field
The invention belongs to teaching aid technical field more particularly to a kind of blackboard cleaning devices.
Background technology
Blackboard is generally used made of plank or ground glass etc., can be write above with the specific writing material such as chalk
Word.Mostly black, blackish green, white or ecru.However blackboard is when in use, using blackboard eraser erase the board on letter written with chalk
Afterwards, have a large amount of chalk dust remain on blackboard and can not be fully erased, this, which is also resulted in, can remain a large amount of powder on blackboard
Dirt influences the effect of viewing, causes the letter written with chalk newly write smudgy, be not easy to watch when writing again.And it is existing black
Plate cleaning device is complicated, inconvenient maintenance, and blackboard cannot quickly dry after cleaning, influences to continue teaching use.
Invention content
Present invention aims to overcome that the deficiencies in the prior art and a kind of blackboard cleaning device is provided.
The object of the present invention is achieved like this：A kind of blackboard cleaning device, including the blackboard on wall and wall, it is special
Sign is：Both sides are horizontally disposed up and down a guide rail for the blackboard, and guide rail includes upper rail and lower guideway, lower guideway and blackboard
The side of contact is provided with gutter channel, and waste water box is provided on the wall of gutter channel left end, and waste water cassette bottom portion is provided with drainpipe, leads
Sliding block is provided in rail, sliding block includes top shoe and sliding block, and drawstring is provided at left and right sides of sliding block, and plane is arranged on sliding block
It is fluted, hot wind plate is provided in groove, hot wind plate lower part is provided with air inlet, and air inlet is connected with into public attention, into public attention
It is connected with blast pipe, hot wind board bottom portion is provided with exhaust vent, sink is provided between the top shoe and sliding block of hot wind plate both sides,
Bottom of gullet is provided with leakage hole, and leak pipe is provided in leakage hole, and leak pipe is connected with snap-gauge, and leak pipe is matched with snap-gauge transition
It closes, absorbent wool is provided in snap-gauge, leak pipe pierces into absorbent wool, and hot wind plate top is provided with supporting rod, is arranged in supporting rod
There is shaft, is connected with pressing plate on the upside of shaft, pressing plate both sides are provided with connecting plate, and connecting plate is fixedly connected with snap-gauge, sink upper end
It is provided with water inlet pipe, outlet pipe is provided on the sink opposite with water inlet pipe, sink lower end is provided with circulation pipe；
It is provided with bearing block on wall at left and right sides of guide rail, bearing is provided in bearing block, rotary shaft is connected in bearing, revolves
Shaft upper end is connected with driving motor, and rotary shaft upper and lower part is both provided with chuck, water inlet pipe, outlet pipe, drawstring and air inlet
Guan Jun is wrapped in the rotary shaft between chuck, and the water inlet pipe and outlet pipe after winding on the rotary shaft are connected with circulating pump, follow
Ring pump is connected with water storage case, and the blast pipe after winding on the rotary shaft is connected with fan heater.
The section of the guide rail is dove-tail form.
The section of the sliding block is dove-tail form.
The drainpipe is externally connected to bucket.
The shape of the groove is isosceles trapezoid.
At left and right sides of the guide rail strut is provided on the wall of end.
It is provided with idler wheel on the strut.
The configuration of the present invention is simple, it is easy to repair, and dried using hot wind after being cleaned to blackboard, after drying
Blackboard can be write immediately, do not interfere with teaching and use.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the partial structural diagram at A in Fig. 1 of the present invention.
Fig. 3 is the partial structural diagram at B in Fig. 1 of the present invention.
Fig. 4 is the partial structural diagram at C in Fig. 1 of the present invention.
Fig. 5 is the partial structural diagram at D in Fig. 1 of the present invention.
Fig. 6 is the partial structural diagram at E in Fig. 1 of the present invention.
Fig. 7 is the partial structural diagram at F in Fig. 1 of the present invention.
Fig. 8 is the partial structural diagram of sink on the right side of hot wind plate of the present invention.
Fig. 9 is the part section structure chart in the middle part of hot wind plate of the present invention.
Figure 10 is the partial structural diagram of hot wind board bottom of the present invention portion and both sides.
Figure 11 is the part section structural representation in the middle part of sink of the present invention.
Figure 12 is the structural schematic diagram of hot wind plate of the present invention.
Figure 13 is the bottom substance schematic diagram of hot wind plate of the present invention.
Specific implementation mode
Embodiment 1, as shown in Fig. 1 ~ Figure 13, a kind of blackboard cleaning device, including the blackboard 2 on wall 1 and wall 1, institute
About 2 both sides of blackboard stated, which are horizontally disposed with, guide rail 7, and the section of guide rail is dove-tail form.Guide rail is fixed on the wall, and guide rail 7 wraps
Upper rail and lower guideway are included, the side that lower guideway is contacted with blackboard 2 is provided with gutter channel 12, on the wall 1 of 12 left end of gutter channel
It is provided with waste water box 13,13 bottom of waste water box is provided with drainpipe 14, and waste water can flow in waste water box from gutter channel, from waste water
Box flows to drainpipe, is discharged from drainpipe, and drainpipe is externally connected to bucket, is focused on to waste water.Setting in guide rail 7
There is sliding block 19, the section of sliding block is dove-tail form.Sliding block can be moved horizontally with guide rail cooperation in guide rail.On sliding block 19 includes
Sliding block and sliding block, the left and right sides of sliding block 19 are provided with drawstring 8, and plane setting is fluted on sliding block 19, and the shape of groove is etc.
Waist is trapezoidal.Hot wind plate 5 is provided in groove, the end of hot wind plate is the groove interference fit in isosceles trapezoid, with sliding block, is convenient for
Hot wind plate is taken out out of groove and repairs replacement.5 lower part of hot wind plate is provided with air inlet 33, be connected at air inlet 33 into
Public attention 17, the shape into public attention are L-type, are hollow, are stuck in air inlet into public attention and are interference fitted with into public attention, convenient for tearing open
It unloads, will not leak out.It is connected with blast pipe 3 into public attention 17,5 bottom of hot wind plate is provided with exhaust vent 32, is convenient for ventilative, hot wind plate
Sink 6 is provided between the top shoe and sliding block of 5 both sides, sink can be fixed on sliding block or be fixed on hot wind plate
Can, it can be bolted to connection, it is easy to disassemble.6 bottom of sink is provided with leakage hole, and leak is provided in leakage hole
Pipe 30, leak pipe are fixed on sink, and are tightly connected with sink, and water enters leak pipe and flowed out from leak pipe, will not be from leakage
The side of water pipe is flowed out, and leak pipe 30 is connected with snap-gauge 29, and leak pipe 30 coordinates with 29 transition of snap-gauge, and snap-gauge can be made not have
Without natural whereabouts in the case of external force, it is provided with absorbent wool 28 in snap-gauge 29, leak pipe 30 pierces into absorbent wool 28, hot wind
5 top of plate is provided with supporting rod 26, and shaft 31 is provided in supporting rod 26, and shaft coordinates with supporting rod transition, 31 upside of shaft
It is connected with pressing plate 25,25 both sides of pressing plate are provided with connecting plate 27, and pressing plate is fixedly connected with connecting plate, and connecting plate 27 is solid with snap-gauge 29
Fixed connection, 6 upper end of sink are provided with water inlet pipe 21, are provided with outlet pipe 24 on the sink 6 opposite with water inlet pipe 21, under sink 6
End is provided with circulation pipe 18；Water in water storage case can be transported to water inlet pipe by circulating pump, be entered in screw clamp from water inlet pipe, one
Part water enters weep pipe and enters in absorbent wool, and another part water enters circulation pipe, is entered from circulation pipe other
In one sink, outlet pipe is entered out of other sink, is entered in circulating pump from outlet pipe, forms the cycle profit of water
With water resource can greatly be saved.
It is provided with strut 16 on the wall of end at left and right sides of guide rail, idler wheel 15 is provided on strut.Idler wheel and water inlet pipe,
Outlet pipe, drawstring and water inlet pipe contact, pair of rollers water inlet pipe, outlet pipe, drawstring and water inlet pipe play the role of support, and can
Be conducive to water inlet pipe, outlet pipe, drawstring and water inlet pipe winding on the rotary shaft.It is provided with axis on the wall 1 of 7 left and right sides of guide rail
Bearing 10 is provided with bearing in bearing block 10, rotary shaft 4 is connected in bearing, and 4 upper end of rotary shaft is connected with driving motor 11,
Driving motor drives rotary shaft forward or reverse, 4 upper and lower part of rotary shaft to be both provided with chuck 9, and chuck plays the work of positioning
With.Water inlet pipe 21, outlet pipe 24, drawstring 8 and blast pipe 3 are wrapped in the rotary shaft 4 between chuck 9, water inlet pipe, outlet pipe
Be rubber hose with water inlet pipe, can circulate water and air while without making water and air block.It is wrapped in rotary shaft 4
Water inlet pipe 21 and outlet pipe 24 after upper are connected with circulating pump 23, and circulating pump 23 is connected with water storage case 22, is wrapped in rotary shaft 4
Blast pipe 3 afterwards is connected with fan heater 20.Fan heater generates hot wind and enters blast pipe, is entered in hot wind plate from blast pipe.
The preferred H6/k5 of transition fit tolerance in the present invention, can gently be squeezed into, concentricity is fine, for passing through with hand hammer
The position often dismantled, when not having external force, matching part has certain frictional force that matched structure can be avoided to rotate, and is having
When certain external force, matched structure can be made to generate certain rotation or move up and down by external force.Exist in the present invention
Pressing plate opposite can be moved up and down with weep pipe under the action of external force, and shaft can turn in supporting rod under the effect of external force
It is dynamic.In the effect of not external force, weep pipe and pressing plate not will produce relative movement, and shaft and supporting rod will not generate relatively
Rotation.
In the use of the present invention, when needing to clean blackboard to the left, the left side of pressing plate is pressed, makes the snap-gauge and card in left side
Absorbent wool in plate is downward, and the absorbent wool in left side is made to be contacted with blackboard.（At this time due to pressing plate be using supporting rod as axle center, when
When the snap-gauge in left side is downward, the snap-gauge on right side is upward, and the snap-gauge in the left side being fixedly connected with the pressing plate is contacted with blackboard downwards, right side
Snap-gauge detach with blackboard do not contacted with blackboard upwards.）Then start driving motor, circulating pump and the fan heater in left side, left side
Driving motor drive rotary shaft rotation, rotary shaft drive drawstring make drawstring be wrapped in left side rotary shaft on, to make sliding block
It is moved to the left, the driving motor on right side does not start at this time, while being wound on drawstring to the left rotary shaft, in the rotary shaft of right side
Drawstring sliding block can be made smoothly to be moved to the left with expansion, similarly outlet pipe, water inlet pipe and blast pipe also can with expansion,
In order to be moved to the left with sliding block.Circulating pump supplies water to absorbent wool, and the absorbent wool after soaking cleans blackboard, exudation
Water is fallen in the gutter channel of bottom, is entered in waste water box and is handled.Simultaneously fan heater hot wind supply into hot wind plate, hot wind from
Air outlet is discharged, and drying and processing is carried out to blackboard, and sliding block is moved to after the left end of guide rail, is completed to cleaning, the drying of blackboard,
It can be write immediately.
When needing to clean blackboard to the right, press the right side of pressing plate, make right side snap-gauge and snap-gauge in absorbent wool to
Under, so that the absorbent wool on right side is contacted with blackboard.（At this time since pressing plate is using supporting rod as axle center, when the snap-gauge on right side is downward
When, the snap-gauge in left side is upward, and the snap-gauge on the right side being fixedly connected with the pressing plate is contacted with blackboard downwards, the snap-gauge in left side upwards with it is black
Plate separation is not contacted with blackboard.）Then start driving motor, circulating pump and the fan heater on right side, the driving motor on right side drives
Rotary shaft rotates, and rotary shaft drives drawstring, water inlet pipe, outlet pipe and blast pipe, makes drawstring, water inlet pipe, outlet pipe and blast pipe
Be wrapped in right side rotary shaft on, to make sliding block move right, at this time left side driving motor do not start, drawstring to the right
While winding in rotary shaft, the drawstring in the rotary shaft of left side can make sliding block smoothly move right, be similarly discharged with expansion
Pipe, water inlet pipe and blast pipe also can be with being wrapped in the rotary shaft on right side, in order to move right with sliding block.Circulating pump is given
Absorbent wool supplies water, and when water deficiency in water storage case can be added.Absorbent wool after soaking cleans blackboard, exudation
Water is fallen in the gutter channel of bottom, is entered in waste water box and is handled.Simultaneously fan heater hot wind supply into hot wind plate, hot wind from
Air outlet is discharged, and drying and processing is carried out to blackboard, and sliding block is moved to after the right end of guide rail, is completed to cleaning, the drying of blackboard,
It can be write immediately.
The configuration of the present invention is simple, it is easy to repair, and dried using hot wind after being cleaned to blackboard, after drying
Blackboard can be write immediately, do not interfere with teaching and use.
Examples detailed above is only the preferred embodiment of the present invention, is not intended to limit the invention, for the technology of this field
For personnel, the invention may be variously modified and varied, all within the spirits and principles of the present invention, made by any repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of blackboard cleaning device, including the blackboard on wall and wall, it is characterised in that：Both sides water above and below the blackboard
Flat to be provided with guide rail, guide rail includes upper rail and lower guideway, and the side that lower guideway is contacted with blackboard is provided with gutter channel, gutter channel
Waste water box is provided on the wall of left end, waste water cassette bottom portion is provided with drainpipe, is provided with sliding block in guide rail, on sliding block includes
Sliding block and sliding block, the sliding block left and right sides are provided with drawstring, and plane setting is fluted on sliding block, and hot wind plate is provided in groove,
Hot wind plate lower part is provided with air inlet, and air inlet is connected with into public attention, and blast pipe, the setting of hot wind board bottom portion are connected with into public attention
There is exhaust vent, sink is provided between the top shoe and sliding block of hot wind plate both sides, bottom of gullet is provided with leakage hole, leakage hole
It is inside provided with leak pipe, leak pipe is connected with snap-gauge, and leak pipe coordinates with snap-gauge transition, and absorbent wool, leak are provided in snap-gauge
Pipe pierces into absorbent wool, and hot wind plate top is provided with supporting rod, and shaft is provided in supporting rod, pressing plate is connected on the upside of shaft,
Pressing plate both sides are provided with connecting plate, and connecting plate is fixedly connected with snap-gauge, and sink upper end is provided with water inlet pipe, opposite with water inlet pipe
Outlet pipe is provided on sink, sink lower end is provided with circulation pipe；
It is provided with bearing block on wall at left and right sides of guide rail, bearing is provided in bearing block, rotary shaft is connected in bearing, revolves
Shaft upper end is connected with driving motor, and rotary shaft upper and lower part is both provided with chuck, water inlet pipe, outlet pipe, drawstring and air inlet
Guan Jun is wrapped in the rotary shaft between chuck, and the water inlet pipe and outlet pipe after winding on the rotary shaft are connected with circulating pump, follow
Ring pump is connected with water storage case, and the blast pipe after winding on the rotary shaft is connected with fan heater.
2. blackboard cleaning device according to claim 1, it is characterised in that：The section of the guide rail is dove-tail form.
3. blackboard cleaning device according to claim 1, it is characterised in that：The section of the sliding block is dove-tail form.
4. blackboard cleaning device according to claim 1, it is characterised in that：The drainpipe is externally connected to bucket.
5. blackboard cleaning device according to claim 1, it is characterised in that：The shape of the groove is isosceles trapezoid.
6. blackboard cleaning device according to claim 1, it is characterised in that：The wall of end at left and right sides of the guide rail
On be provided with strut.
7. blackboard cleaning device according to claim 6, it is characterised in that：It is provided with idler wheel on the strut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810629990.3A CN108501584B (en) | 2018-06-19 | 2018-06-19 | Blackboard cleaning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810629990.3A CN108501584B (en) | 2018-06-19 | 2018-06-19 | Blackboard cleaning device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108501584A true CN108501584A (en) | 2018-09-07 |
| CN108501584B CN108501584B (en) | 2024-05-14 |
Family
ID=63403608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810629990.3A Active CN108501584B (en) | 2018-06-19 | 2018-06-19 | Blackboard cleaning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108501584B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114454646A (en) * | 2022-03-04 | 2022-05-10 | 阜阳职业技术学校(颍东技工学校) | Integrated combined blackboard structure with blackboard eraser |
| CN114454650A (en) * | 2022-03-04 | 2022-05-10 | 阜阳职业技术学校(颍东技工学校) | Rolling type dry-wet synchronous use efficient blackboard erasing method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08113000A (en) * | 1994-10-14 | 1996-05-07 | Nichigaku Kk | Method and device for erasing blackboard |
| KR20050047321A (en) * | 2003-11-17 | 2005-05-20 | 한국흑판교재주식회사 | Cleaning device of water cleaning blackboard |
| CN102442121A (en) * | 2010-10-08 | 2012-05-09 | 吴军来 | Automatic blackboard |
| CN202225626U (en) * | 2011-10-12 | 2012-05-23 | 徐德刚 | Blackboard capable of removing chalk dust automatically |
| CN203611609U (en) * | 2013-12-20 | 2014-05-28 | 侯桂云 | Remote control type automatic-clearing blackboard |
| CN104890417A (en) * | 2015-06-04 | 2015-09-09 | 浙江理工大学 | Full-automatic environment-friendly blackboard eraser |
| CN106739698A (en) * | 2017-02-07 | 2017-05-31 | 叶潇 | A kind of Accounting Course multi-functional blackboard Quick cleaning device |
| CN208232651U (en) * | 2018-06-19 | 2018-12-14 | 温力康 | A kind of blackboard cleaning device |
-
2018
- 2018-06-19 CN CN201810629990.3A patent/CN108501584B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08113000A (en) * | 1994-10-14 | 1996-05-07 | Nichigaku Kk | Method and device for erasing blackboard |
| KR20050047321A (en) * | 2003-11-17 | 2005-05-20 | 한국흑판교재주식회사 | Cleaning device of water cleaning blackboard |
| CN102442121A (en) * | 2010-10-08 | 2012-05-09 | 吴军来 | Automatic blackboard |
| CN202225626U (en) * | 2011-10-12 | 2012-05-23 | 徐德刚 | Blackboard capable of removing chalk dust automatically |
| CN203611609U (en) * | 2013-12-20 | 2014-05-28 | 侯桂云 | Remote control type automatic-clearing blackboard |
| CN104890417A (en) * | 2015-06-04 | 2015-09-09 | 浙江理工大学 | Full-automatic environment-friendly blackboard eraser |
| CN106739698A (en) * | 2017-02-07 | 2017-05-31 | 叶潇 | A kind of Accounting Course multi-functional blackboard Quick cleaning device |
| CN208232651U (en) * | 2018-06-19 | 2018-12-14 | 温力康 | A kind of blackboard cleaning device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114454646A (en) * | 2022-03-04 | 2022-05-10 | 阜阳职业技术学校(颍东技工学校) | Integrated combined blackboard structure with blackboard eraser |
| CN114454650A (en) * | 2022-03-04 | 2022-05-10 | 阜阳职业技术学校(颍东技工学校) | Rolling type dry-wet synchronous use efficient blackboard erasing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108501584B (en) | 2024-05-14 |
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