CN108177468A - A kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit - Google Patents

A kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit Download PDF

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Publication number
CN108177468A
CN108177468A CN201711446503.1A CN201711446503A CN108177468A CN 108177468 A CN108177468 A CN 108177468A CN 201711446503 A CN201711446503 A CN 201711446503A CN 108177468 A CN108177468 A CN 108177468A
Authority
CN
China
Prior art keywords
dust
english teaching
teaching blackboard
blackboard
water
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
CN201711446503.1A
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Chinese (zh)
Inventor
蔡婧宇
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Mudanjiang Normal University
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Mudanjiang Normal University
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Filing date
Publication date
Application filed by Mudanjiang Normal University filed Critical Mudanjiang Normal University
Priority to CN201711446503.1A priority Critical patent/CN108177468A/en
Publication of CN108177468A publication Critical patent/CN108177468A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B43L21/02Blackboard or slate cleaning devices with means for absorbing the chalk dust
    • 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

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  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

The invention discloses a kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit, including:Flow-guiding structure is recycled, including cyclic water tank, water pump and horizontal diversion pipe, the horizontal diversion pipe is connected by hose with the water pump water outlet end, and the horizontal diversion pipe offers multiple apopores;Dedusting dry body, including air blowing component and dust suction subassembly;Control mechanism, including being arranged on the dust detector of the English teaching blackboard side wall, the flow detector being placed in the horizontal diversion pipe and the controller being connect respectively with the dust detector and the flow detector signal.English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit provided by the invention can cause dry method blackboard wiping and writing process the dust around blackboard timely and effectively to be removed, it ensure that the breathing environment of Faculty and Students, the blackboard after wet method blackboard wiping can quickly be dried up simultaneously, improve the wiping efficiency of blackboard, high degree of automation.

Description

A kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit
Technical field
The present invention relates to English teaching device technical field, it is more particularly related to a kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit.
Background technology
" teacher person transmits wisdom and imparts knowledge and explains the puzzle ", traditional writing on the blackboard transmit wisdom and impart knowledge explain the puzzle in account for important historical role.It is thousands of Nian Lai, one side writing on the blackboard, the teaching method of explanation is able to pass on for outstanding Chinese culture on one side is made that major contribution.However as Chalk " lively and vigorous " on blackboard, dust " has been covered with " classroom immediately, this is also into traditional teaching environment.In China, often Teacher of the number of days in terms of necessarily will make writing on the blackboard with chalk, and that has no alternative lives in the chalk dust after blackboard wiping.
Wiping for blackboard mainly includes two kinds of wiping methods, the first is wiped for dry method, i.e., is carried out using blackboard eraser Erasing, for the blackboard of English teaching, since the content that English teacher writes on blackboard is more, wipes using dry method A large amount of dust can be generated during blackboard, severely compromise the health of numerous teachers or even injures student.According to authoritative machine Structure data, which is shown, shows chalk dust from flying respectively to lung, the upper respiratory tract, eyes, skin and ear there is harm, Also it can induce other diseases again simultaneously.Therefore it needs to remove chalk generation in real time in dry method blackboard wiping and writing process Dust builds the academic environment of health.
Wet method blackboard wiping, which can be removed from, generates a large amount of dust, but there are still water stain drying it is slow the problem of, affect Teaching is normally carried out.
The Chinese patent of Patent No. CN107344469A discloses a kind of water conservancy diversion of English teaching blackboard Wet-dry and removes By installing cloth bag guiding device in the side of English teaching blackboard, dust-extraction unit is installed in opposite side for dirt device, so as to fulfill Dedusting, but low there is the degree of automation, and cannot rationally effectively be selected according to the wiping mode of blackboard it is suitable Device.
Invention content
It is an object of the invention to solve at least the above, and provide the advantages of at least will be described later.
It is a still further object of the present invention to provide a kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction units, can The wiping mode of blackboard is detected, the dust around blackboard can be caused to carry out to dry method blackboard wiping and writing process timely and effective Removing, ensure that the breathing environment of Faculty and Students, while the blackboard after wet method blackboard wiping quickly can be dried up, Improve the wiping efficiency of blackboard.
It is also another object of the present invention to provide a kind of English teaching blackboard Wet-dry water conservancy diversion of high degree of automation Dust-extraction unit.
To achieve these goals, the present invention provides a kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit, packets It includes:
Recycle flow-guiding structure, include be located at English teaching blackboard below cyclic water tank, be placed in the cyclic water tank Water pump and the horizontal diversion pipe above the English teaching blackboard, the horizontal diversion pipe pass through hose and the water Water end (W.E.) connection is pumped out, the horizontal diversion pipe offers multiple apopores towards the English teaching blackboard;
Dedusting dry body is taught including the air blowing component positioned at the English teaching blackboard side and positioned at the English Learn the dust suction subassembly of blackboard opposite side;
Control mechanism is led including being arranged on the dust detector of the English teaching blackboard side wall, being placed in the level Flow detector in flow tube and the controller being connect respectively with the dust detector and the flow detector signal;
Wherein, the dust concentration around the English teaching blackboard that the dust detector detects in real time is not less than Certain value, and when the water-flow signal that detects of the flow detector is 0, the controller control opens the air blowing group simultaneously Part and the dust suction subassembly, and when the dust concentration around English teaching blackboard is less than the certain value, controller control Simultaneously close off the air blowing component and the dust suction subassembly;
Dust concentration around the English teaching blackboard that the dust detector detects in real time is less than certain value, And the water-flow signal that detects of the flow detector is when being 0, the controller after the water-flow signal is received 1~ The air blowing component is opened in 5min controls, and it is 1~5min to control working time of the air blowing component;
Dust concentration around the English teaching blackboard that the dust detector detects in real time is not less than certain Value, and when the water-flow signal that detects of the flow detector is not 0, the controller is after the water-flow signal is received 1~5min controls open the air blowing component and the dust suction subassembly simultaneously, until the powder around the English teaching blackboard received Dust concentration closes the dust suction subassembly when being less than certain value, while is 0 and English teaching blackboard week in the water-flow signal received The dust concentration enclosed closes the air blowing component when being less than certain value.
Preferably, the English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit, the air blowing component include air blast Machine and the blow head connected by blower with the air blower, the blow head is horn-like, and the major part of the blow head It holds towards the English teaching blackboard.
Preferably, the English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit, the dust suction subassembly include dust suction Head, the vacuum cleaner that is connected by sweep-up pipe with the cleaner head and positioned at the vacuum cleaner rear and pass through pipeline and the suction The Rose Box of the port of export connection of dirt machine, the cleaner head is horn-like, and the stub end of the cleaner head is towards the English Blackboard for education.
Preferably, the English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit, in the cyclic water tank from up to Under be disposed with the first filter screen and the second filter screen, second filter screen is located at the top of the water pump, described first The mesh of filter screen is more than the mesh of second filter screen.
Preferably, the English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit, in the Rose Box from top to bottom The first filter and the second filter are disposed with, the side wall of the Rose Box is simultaneously opened below second filter Equipped with gas outlet.
Preferably, the English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit, the certain value are 0.03mg/ m3
Preferably, the English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit, the length of the horizontal diversion pipe Equal to the length of the English teaching blackboard.
The present invention includes at least following advantageous effect:
1st, English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit provided by the invention can be according to English teaching blackboard week The dust concentration enclosed and the water-flow signal selection of flow detector are dusted English teaching blackboard operation or drying operation, It ensure that the wiping effect and efficiency of blackboard, ensure that the breathing environment of Faculty and Students.
2nd, the structure of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit provided by the invention is simple, the degree of automation Height, suitable for any teaching process.
Part is illustrated to embody by further advantage, target and the feature of the present invention by following, and part will also be by this The research and practice of invention and be understood by the person skilled in the art.
Description of the drawings
Fig. 1 is the structure diagram of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention is described in further detail, those skilled in the art to be enabled to join Book word can be implemented according to this as directed.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein are not precluded one or more The presence or addition of a other element or combinations.
As shown in Figure 1, the invention discloses a kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit, including:
Flow-guiding structure is recycled, including being located at the cyclic water tank 2 of 1 lower section of English teaching blackboard, being placed in the cyclic water tank 2 Interior water pump 3 and the horizontal diversion pipe 4 above the English teaching blackboard 1, the horizontal diversion pipe 4 by hose with 3 water outlet of the water pump connection, the horizontal diversion pipe 4 offer multiple apopores towards the English teaching blackboard 1;
Dedusting dry body is taught including the air blowing component positioned at the English teaching blackboard side and positioned at the English Learn the dust suction subassembly of blackboard opposite side;
Control mechanism, including being arranged on the dust detector 5 of 1 side wall of English teaching blackboard, being placed in the level Flow detector 6 in diversion pipe 4 and the control being connect respectively with the dust detector 5 and 6 signal of the flow detector Device processed;
Wherein, the dust concentration around the English teaching blackboard 1 that the dust detector 5 detects in real time is not small In 0.03mg/m3, and when the water-flow signal that detects of the flow detector 6 is 0, described in the controller control is opened simultaneously Air blowing component and the dust suction subassembly, and the dust concentration around English teaching blackboard 1 is less than 0.03mg/m3When, the control Device control processed simultaneously closes off the air blowing component and the dust suction subassembly;
Dust concentration around the English teaching blackboard 1 that the dust detector 5 detects in real time is less than 0.03mg/m3, and when the water-flow signal that detects of the flow detector 6 is not 0, the controller is receiving flow letter The air blowing component is opened in 1~5min controls after number, and it is 1~5min to control working time of the air blowing component;
Dust concentration around the English teaching blackboard 1 that the dust detector 5 detects in real time is not less than 0.03mg/m3, and when the water-flow signal that detects of the flow detector 6 is not 0, the controller is receiving flow letter 1~5min controls after number open the air blowing component and the dust suction subassembly simultaneously, until the English teaching blackboard 1 received The dust concentration of surrounding is less than 0.03mg/m3When close the dust suction subassembly, while be 0 and English in the water-flow signal received Dust concentration around blackboard for education 1 is less than 0.03mg/m3When close the air blowing component.Wherein water-flow signal is to flow for 0 Amount detector be not detected have in horizontal diversion pipe 4 flow by situation, that is, the flow of the water in horizontal diversion pipe 4 is 0 situation.
As the highly preferred one embodiment of the present invention, air blowing component of the present invention includes air blower 7 and passes through The blow head 9 that blower 8 is connected with the air blower 7, the blow head 9 is horn-like, and the stub end court of the blow head 9 To the English teaching blackboard 1.
Dust suction subassembly includes cleaner head 10, the vacuum cleaner 12 connected by sweep-up pipe 11 with the cleaner head 10 and is located at 12 rear of vacuum cleaner simultaneously passes through the Rose Box 13 that pipeline is connect with the port of export of the vacuum cleaner 12, and the cleaner head 10 is It is horn-like, and the stub end of the cleaner head 10 is towards the English teaching blackboard 1.
The course of work of the most preferred embodiment is:Around the English teaching blackboard 1 that dust detector 5 detects in real time Dust concentration is not less than 0.03mg/m3, and when the water-flow signal that detects of flow detector 6 is 0, i.e., it is in dry method wiping at this time It wipes English teaching blackboard 1 or dust caused by certain reason around English teaching blackboard 1 is more, the controller control is same Shi Kaiqi air blowers 7 and vacuum cleaner 12, and the dust concentration around English teaching blackboard 1 is less than 0.03mg/m3When, the control Device control processed simultaneously closes off air blower 7 and vacuum cleaner 12;
When wet method is needed to wipe English teaching blackboard 1, start water pump 3, the water in cyclic water tank 2 is evacuated to water by water pump 3 In flat diversion pipe 4, and pass through the top that apopore pours English teaching blackboard 1, and black to English teaching by its own gravity of water The flows of plate, the foundation of the control process of controller are:The institute that the dust detector 5 that controller receives detects in real time The dust concentration stated around English teaching blackboard 1 is less than 0.03mg/m3, and the water-flow signal that the flow detector 6 detects It is not 0,1~5min control of the controller after the water-flow signal is received opens air blower 7, and control air blower 7 Working time be 1~5min;1~5min after water-flow signal is received is selected to open air blower 7, is to horizontal water conservancy diversion Water in pipe 4 scavenging period enough to English teaching blackboard 1 that is, after the completion of water cleans English teaching blackboard or cleans Air blower 7 is opened after a period of time, blow head 9 dries up English teaching blackboard, and the determining of the dead time be basis The spouting velocity of water determines in English teaching blackboard top to the distance between bottom end and horizontal diversion pipe 4, to ensure After entire blackboard surface is drenched, start air blower 7 and be blowed.
Dust concentration around the English teaching blackboard 1 that dust detector 5 detects in real time is not less than 0.03mg/m3, And the water-flow signal that detects of flow detector 6 is when being 0,1~5min control of the controller after the water-flow signal is received System opens air blower 7 and vacuum cleaner 12 simultaneously, until the dust concentration around the English teaching blackboard 1 received is less than 0.03mg/ m3When close vacuum cleaner 12, while the water-flow signal received for 0 and English teaching blackboard 1 around dust concentration be less than 0.03mg/m3When close air blower.This kind of situation is that English teaching blackboard 1 is wiped using wet method, but is being wiped across Since outside cause causes the dust concentration around English teaching blackboard 1 to increase suddenly in journey, first ensure horizontal diversion pipe 4 at this time Interior water drenches entire plate face and rinses certain time, then air blower 7 and vacuum cleaner 12 is opened simultaneously, to English teaching blackboard 1 while dried up, and removes the dust around English teaching blackboard, and after dust concentration is reduced to certain value, flow inspection When the flow signal for surveying the detection of instrument 6 is 0, air blower 7 is closed.
Further, in order to realize the water circulation use in cyclic water tank 2, in the cyclic water tank 2 from top to bottom successively It is provided with the first filter screen 14 and the second filter screen 15, second filter screen 15 is located at the top of the water pump 3, and described first The mesh of filter screen 14 is more than the mesh of second filter screen 15.
Further, it is disposed with the first filter 16 and the second filter 17 from top to bottom in the Rose Box 13, The side wall of the Rose Box 13 simultaneously offers gas outlet positioned at the lower section of second filter 17, to realize to suction filter case Gas in 13 is dusted the effect of purification.The mesh of first filter 16 be equal to the first filter screen 14 mesh, second every The mesh of dirt net 17 is equal to the mesh of the second filter screen 15.
Further, the length of horizontal diversion pipe 4 is equal to the length of English teaching blackboard 1.
Although the embodiments of the present invention have been disclosed as above, but its be not restricted in specification and embodiment it is listed With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, it is of the invention and unlimited In specific details and legend shown and described herein.

Claims (7)

1. a kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit, which is characterized in that including:
Flow-guiding structure is recycled, includes being located at cyclic water tank below English teaching blackboard, the water that is placed in the cyclic water tank Pump and the horizontal diversion pipe above the English teaching blackboard, the horizontal diversion pipe are pumped out by hose and the water Water end (W.E.) connects, and the horizontal diversion pipe offers multiple apopores towards the English teaching blackboard;
Dedusting dry body, including positioned at the English teaching blackboard side air blowing component and positioned at the English teaching it is black The dust suction subassembly of plate opposite side;
Control mechanism, including being arranged on the dust detector of the English teaching blackboard side wall, being placed in the horizontal diversion pipe Interior flow detector and the controller being connect respectively with the dust detector and the flow detector signal;
Wherein, the dust concentration around the English teaching blackboard that the dust detector detects in real time is not less than certain Value, the and when water-flow signal that detects of the flow detector is 0, the controller control open simultaneously the air blowing component and The dust suction subassembly, and when the dust concentration around English teaching blackboard is less than the certain value, controller control is simultaneously Close the air blowing component and the dust suction subassembly;
Dust concentration around the English teaching blackboard that the dust detector detects in real time is less than certain value, and institute When to state water-flow signal that flow detector detects be not 0,1~5min of the controller after the water-flow signal is received The air blowing component is opened in control, and it is 1~5min to control working time of the air blowing component;
Dust concentration around the English teaching blackboard that the dust detector detects in real time is not less than certain value, and The water-flow signal that the flow detector detects be 0 when, the controller after the water-flow signal is received 1~ 5min opens the air blowing component and the dust suction subassembly simultaneously, until the dust concentration around the English teaching blackboard received is small The dust suction subassembly is closed when certain value, while is the dust around 0 and English teaching blackboard in the water-flow signal received Concentration closes the air blowing component when being less than certain value.
2. a kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit according to claim 1, which is characterized in that described Air blowing component includes air blower and the blow head connected by blower with the air blower, and the blow head is horn-like, and The stub end of the blow head is towards the English teaching blackboard.
3. a kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit according to claim 2, which is characterized in that described Dust suction subassembly include cleaner head, the vacuum cleaner that is connected by sweep-up pipe with the cleaner head and positioned at the vacuum cleaner rear simultaneously The Rose Box being connect by pipeline with the port of export of the vacuum cleaner, the cleaner head is horn-like, and the cleaner head is big Head end is towards the English teaching blackboard.
4. a kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit according to claim 1, which is characterized in that described The first filter screen and the second filter screen are disposed in cyclic water tank from top to bottom, second filter screen is located at the water pump Top, the mesh of first filter screen is more than the mesh of second filter screen.
5. a kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit according to claim 3, which is characterized in that described It is disposed with the first filter and the second filter in Rose Box from top to bottom, the side wall of the Rose Box and positioned at described the Gas outlet is offered below two filters.
6. a kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit according to claim 1, which is characterized in that described Certain value is 0.03mg/m3
7. a kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit according to claim 1, which is characterized in that described The length of horizontal diversion pipe is equal to the length of the English teaching blackboard.
CN201711446503.1A 2017-12-27 2017-12-27 A kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit Pending CN108177468A (en)

Priority Applications (1)

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CN201711446503.1A CN108177468A (en) 2017-12-27 2017-12-27 A kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit

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Application Number Priority Date Filing Date Title
CN201711446503.1A CN108177468A (en) 2017-12-27 2017-12-27 A kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108944197A (en) * 2018-07-13 2018-12-07 柏涛涛 A kind of multi-functional environment-protection dust-absorbing blackboard device
CN109334307A (en) * 2018-11-22 2019-02-15 雷宏友 A kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit
CN109551944A (en) * 2019-01-18 2019-04-02 重庆财经职业学院 A kind of English teaching water conservancy diversion dust-extraction unit

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JPH10181284A (en) * 1996-12-20 1998-07-07 Ricoh Elemex Corp Writing board
CN2897678Y (en) * 2006-03-02 2007-05-09 秦贞义 Electric blackboard with water eraser
CN201362100Y (en) * 2009-01-21 2009-12-16 万峻豪 Convenient blackboard
CN201922757U (en) * 2011-02-22 2011-08-10 赵凤卿 Automatic dust-collecting blackboard
CN204037179U (en) * 2014-09-04 2014-12-24 郭家灵 A kind of washing air-dry facilitates blackboard for Chinese teaching
CN204367729U (en) * 2015-01-22 2015-06-03 杨静 English teaching blackboard Wet-dry water conservancy diversion dust arrester
CN204382943U (en) * 2015-01-23 2015-06-10 赵辉 A kind of environmental protection type blackboard preventing dust from flying
CN204472287U (en) * 2015-03-19 2015-07-15 徐美华 Mathematical education blackboard dust gas solid separation collects escaper
CN105774339A (en) * 2016-05-13 2016-07-20 安庆师范学院 Teaching blackboard convenient to clean
CN205498441U (en) * 2016-02-15 2016-08-24 新乡职业技术学院 English teaching blackboard wet or dry water conservancy diversion dust collector
CN205970493U (en) * 2016-06-24 2017-02-22 济宁市金蓝领教育咨询有限公司 Multi -functional blackboard
CN106626895A (en) * 2017-02-09 2017-05-10 温州兴南环保科技有限公司 Environment-friendly blackboard

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10181284A (en) * 1996-12-20 1998-07-07 Ricoh Elemex Corp Writing board
CN2897678Y (en) * 2006-03-02 2007-05-09 秦贞义 Electric blackboard with water eraser
CN201362100Y (en) * 2009-01-21 2009-12-16 万峻豪 Convenient blackboard
CN201922757U (en) * 2011-02-22 2011-08-10 赵凤卿 Automatic dust-collecting blackboard
CN204037179U (en) * 2014-09-04 2014-12-24 郭家灵 A kind of washing air-dry facilitates blackboard for Chinese teaching
CN204367729U (en) * 2015-01-22 2015-06-03 杨静 English teaching blackboard Wet-dry water conservancy diversion dust arrester
CN204382943U (en) * 2015-01-23 2015-06-10 赵辉 A kind of environmental protection type blackboard preventing dust from flying
CN204472287U (en) * 2015-03-19 2015-07-15 徐美华 Mathematical education blackboard dust gas solid separation collects escaper
CN205498441U (en) * 2016-02-15 2016-08-24 新乡职业技术学院 English teaching blackboard wet or dry water conservancy diversion dust collector
CN105774339A (en) * 2016-05-13 2016-07-20 安庆师范学院 Teaching blackboard convenient to clean
CN205970493U (en) * 2016-06-24 2017-02-22 济宁市金蓝领教育咨询有限公司 Multi -functional blackboard
CN106626895A (en) * 2017-02-09 2017-05-10 温州兴南环保科技有限公司 Environment-friendly blackboard

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108944197A (en) * 2018-07-13 2018-12-07 柏涛涛 A kind of multi-functional environment-protection dust-absorbing blackboard device
CN109334307A (en) * 2018-11-22 2019-02-15 雷宏友 A kind of English teaching blackboard Wet-dry water conservancy diversion dust-extraction unit
CN109551944A (en) * 2019-01-18 2019-04-02 重庆财经职业学院 A kind of English teaching water conservancy diversion dust-extraction unit

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Application publication date: 20180619