CN109872574A - An intelligent blackboard structure - Google Patents
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- CN109872574A CN109872574A CN201910151518.8A CN201910151518A CN109872574A CN 109872574 A CN109872574 A CN 109872574A CN 201910151518 A CN201910151518 A CN 201910151518A CN 109872574 A CN109872574 A CN 109872574A
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- 230000005674 electromagnetic induction Effects 0.000 claims description 17
- 230000006698 induction Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
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Abstract
本发明提供一种应用于教学用具技术领域的智能黑板结构，所述的智能黑板结构的黑板框架(1)左侧内侧面设置左滑动凹槽(3)，黑板框架(1)右侧内侧面设置右滑动凹槽(4)，黑板显示器(2)左侧设置多个左滑轮(5)，每个左滑轮(5)安装在一个左滑轮支架(6)上，黑板显示器(2)右侧设置多个右滑轮(8)，每个右滑轮(8)安装在一个右滑轮支架(9)上，黑板显示器(2)为压感式电磁板，本发明所述的智能黑板结构，在教学过程中能够方便快捷实现黑板的移动，同时不再需要奋笔书写自己，能够使得黑板具有自动全部清除功能及特定区域清除功能，不再需要人工清楚粉笔字迹，降低教学者的劳动强度，节约课堂教学时间。
The present invention provides an intelligent blackboard structure applied in the technical field of teaching tools. The left sliding groove (3) is provided on the left inner side of the blackboard frame (1) of the intelligent blackboard structure, and the right inner side of the blackboard frame (1) is provided with a left sliding groove (3). A right sliding groove (4) is provided, a plurality of left pulleys (5) are arranged on the left side of the blackboard display (2), each left pulley (5) is mounted on a left pulley bracket (6), and the right side of the blackboard display (2) is provided A plurality of right pulleys (8) are provided, each right pulley (8) is mounted on a right pulley bracket (9), the blackboard display (2) is a pressure-sensitive electromagnetic board, and the intelligent blackboard structure of the present invention is used in teaching In the process, the movement of the blackboard can be easily and quickly realized, and at the same time, it is no longer necessary to write on oneself. teaching time.
Description
Technical field
The invention belongs to teaching aid technical fields, are to be related to a kind of intelligent blackboard structure more specifically.
Background technique
Blackboard is the important teaching aid in school instruction.In the prior art, many refectory blackboards are all the iron sheets used
Manufactured, usual teacher can be write on blackboard plate with chalk, and a large amount of powder that chalk is formed are bound to give academics and students' body
Body health care belt carrys out detrimental effect；After teacher writes the text of a blackboard, quick and clean wiping blackboard, Er Qieyou are thought
When needing to wipe the content of fixed area on blackboard, can all make troubles to the teacher to attend class.There is intelligent blackboard in the market, but
It is general all higher costs, so being unable to get universal popularization and application.
Summary of the invention
The technical problems to be solved by the present invention are: it is simple to provide a kind of structure, and it is easy to use, it can in teaching process
The convenient and efficient movement for realizing blackboard, while the pen that no longer needs to put forth energy writes oneself, so that blackboard has automatically all
It removes function and function is removed in specific region, it is no longer necessary to manually understand chalk writing, the intelligence for saving the classroom instruction time is black
Hardened structure.
Solve the problems, such as techniques discussed above, the technical scheme adopted by the invention is as follows:
The present invention is a kind of intelligent blackboard structure, and the intelligent blackboard structure includes blackboard framework, blackboard display, black
Left sliding recess is arranged in medial surface on the left of plate framework, and right sliding recess is arranged in medial surface on the right side of blackboard framework, and blackboard display is left
Multiple left chain wheels are arranged in side, and each left chain wheel is mounted on a left chain wheel bracket, each left chain wheel bracket and blackboard display
One left elastic element is set between left side, and each left chain wheel is installed on respectively in left sliding recess, is set on the right side of blackboard display
Multiple right pulley are set, each right pulley is mounted on a right pulley bracket, on the right side of each right pulley bracket and blackboard display
Between a right elastic element is set, each right pulley is installed on respectively in left sliding recess, and blackboard display is pressure-sensitive electricity
Multiple rows of electromagnetic induction sensor component is arranged on blackboard display in magnetic sheet, and every row's electromagnetic induction sensor component includes multiple electricity
Magnetic induction sensor, the intelligent blackboard structure further include that can issue electromagnetic wave to the hand-written of each electromagnetic induction sensor
Pen, each electromagnetic induction sensor are connect with control unit respectively, and control unit is arranged on blackboard framework.
The blackboard display of the intelligent blackboard structure includes blackboard display I and blackboard display II, blackboard framework
The left sliding recess of left side medial surface includes left sliding recess I and left sliding recess II, the right cunning of medial surface on the right side of blackboard framework
Dynamic groove includes right sliding recess I and right sliding recess II.
Multiple left chain wheels I are set on the left of the blackboard display I, and each left chain wheel I is mounted on a left chain wheel bracket I
On, left elastic element I is set between each left chain wheel bracket I and blackboard display I, and it is recessed that left chain wheel I is installed on left sliding respectively
In slot I, multiple right pulley I are set, each right pulley I is mounted on right pulley bracket I, each right cunning on the right side of blackboard display I
A right elastic element I is arranged between I right side in wheel support I and blackboard display, and it is recessed that each right pulley I is installed on right sliding respectively
In slot I.
Multiple left chain wheels II are set on the left of the blackboard display II, and each left chain wheel II is mounted on a left chain wheel branch
On frame II, left elastic element II is set, left chain wheel II is installed on respectively between each left chain wheel bracket II and blackboard display II
In left sliding recess II, multiple right pulley II are set, each right pulley II is mounted on right pulley bracket on the right side of blackboard display II
On II, a right elastic element II, each right pulley II is arranged between II right side in each right pulley bracket II and blackboard display
It is installed in right sliding recess II respectively.
Pen point pressure sensor is arranged in the pen tip position of the writing pencil, and pen point pressure sensor and control unit connect
It connects, for the writing pencil when writing on blackboard display, it is real-time that pen point pressure sensor is configured to induction writing pressure
The structure of numerical value, pen point pressure sensor are configured to that writing pressure real time value is fed back to the knot of control unit in real time
Structure.
The pen point pressure sensor will write pressure real time value when feeding back to control unit in real time, and control unit is set
The structure of signal can be sent to the electromagnetic induction sensor of writing pencil writing part in real time by being set to, and be passed to control battery induction
Sensor shows the structure of the thickness writing directly proportional to writing pencil writing pressure size on blackboard display.
One key is set on the control unit of the intelligent blackboard structure and removes button, user presses next key and removes button
When, a key is removed button and is configured to control unit feedback signal, so that control unit controls I He of blackboard display
The writing shown on blackboard display II all realizes the structure removed.
Sectional displays are set on the control unit of the intelligent blackboard structure and remove button I, user presses part
When display removes button I, sectional displays are removed button I and are configured to control unit feedback signal, so that control
The writing shown on component controls blackboard display I processed all realizes the structure removed.
Sectional displays are set on the control unit of the intelligent blackboard structure and remove button II, user presses part
When display removes button II, sectional displays are removed button II and are configured to control unit feedback signal, so that
The writing shown on control unit control blackboard display II all realizes the structure removed.
The blackboard display of the intelligent blackboard structure is digital type magnetic board.
Using technical solution of the present invention, can obtain it is below the utility model has the advantages that
Intelligent blackboard structure of the present invention, blackboard are intelligence structure, and blackboard display is movably arranged on blackboard framework
On, it can move up and down, and the effect of elastic element, apply tensile force between blackboard display and blackboard framework, so that only
There is the power of application upward or downward when on blackboard display, blackboard display can just move up and down, and otherwise can be in fixing shape
State is write on blackboard convenient for instructor.And blackboard display is pressure-sensitive magnetic board, through writing pencil on blackboard display
It writes, the pressure sensor at the position that writing pencil is write on blackboard display can experience pressure, thus in blackboard display
Show writing.And when needing to remove writing, by operation control portion part, control unit meeting feedback signal gives blackboard display, from
And the writing on blackboard display is removed.Chalk-writing is no longer needed when in this way, writing, is also no longer needed for manually logical
Blackboard eraser erasing out handwriting is crossed, to improve ease of use the problem of influencing instructor's health there is no dust pollution.
Intelligent blackboard structure of the present invention, is capable of the movement of convenient and efficient realization blackboard in teaching process, while no longer needing
Pen of putting forth energy writes oneself, enables to blackboard to have the function of automatic all remove and function is removed in specific region, it is no longer necessary to artificial
Understand chalk writing, reduce the labor intensity of instructor, saves the classroom instruction time.
Detailed description of the invention
Brief description is made to content expressed by each attached drawing of this specification and the label in figure below:
Fig. 1 is the schematic view of the front view of intelligent blackboard structure of the present invention；
Fig. 2 is the schematic cross-sectional view in the face A-A of intelligent blackboard structure of the present invention；
Attached drawing acceptance of the bid note is respectively as follows: 1, blackboard framework；2, blackboard display；3, left sliding recess；4, right sliding recess；5,
Left chain wheel；6, left chain wheel bracket；7, left elastic element；8, right pulley；9, right pulley bracket；10, right elastic element；11, it controls
Component；12, blackboard display I；13, blackboard display II；14, left sliding recess I；15, left sliding recess II；16, right sliding
Groove I；17, right sliding recess II；18, a key removes button；19, sectional displays remove button I；20, sectional displays are clear
Except button II.
Specific embodiment
Below against attached drawing, by the description of the embodiment, to for example related each structure of a specific embodiment of the invention
The works such as the shape of part, construction, the mutual alignment between each section and connection relationship, the effect of each section and working principle are further
Detailed description:
As shown in attached drawing 1, attached drawing 2, the present invention is a kind of intelligent blackboard structure, and the intelligent blackboard structure includes blackboard
Left sliding recess 3, the setting of 1 right side medial surface of blackboard framework is arranged in frame 1, blackboard display 2,1 left side medial surface of blackboard framework
Multiple left chain wheels 5 are arranged on the left of blackboard display 2 in right sliding recess 4, and each left chain wheel 5 is mounted on a left chain wheel bracket 6
On, a left elastic element 7 is arranged between 2 left side in each left chain wheel bracket 6 and blackboard display, and each left chain wheel 5 blocks respectively
In left sliding recess 3, multiple right pulley 8 are set, each right pulley 8 is mounted on a right pulley on the right side of blackboard display 2
On bracket 9, a right elastic element 10, each right pulley 8 is arranged between 2 right side in each right pulley bracket 9 and blackboard display
It is installed in left sliding recess 3 respectively, blackboard display 2 is pressure-sensitive magnetic board, and multiple rows of electromagnetism sense is arranged on blackboard display 2
Inductive sensing device assembly, every row's electromagnetic induction sensor component include multiple electromagnetic induction sensors, the intelligent blackboard structure
Further include can issue electromagnetic wave give each electromagnetic induction sensor writing pencil, each electromagnetic induction sensor respectively with control
Component 11 connects, and control unit 11 is arranged on blackboard framework 1.Above structure, blackboard are intelligence structure, and blackboard display 2 is living
It is dynamic to be mounted on blackboard framework, it can move up and down, and the effect of elastic element, apply tensile force in blackboard display and blackboard
Between frame, so that the only power of application upward or downward is when on blackboard display, blackboard display can just be moved up and down, no
It can be then in stationary state, write on blackboard convenient for instructor.And blackboard display is pressure-sensitive magnetic board, passes through writing pencil
It is write on blackboard display, the pressure sensor at the position that writing pencil is write on blackboard display can experience pressure, from
And writing is shown in blackboard display.And when needing to remove writing, by operation control portion part, control unit meeting feedback signal is given
Blackboard display, so that the writing on blackboard display is removed.Chalk-writing is no longer needed when in this way, writing, also
It no longer needs manually to pass through blackboard eraser erasing out handwriting, thus the problem of influencing instructor's health there is no dust pollution,
Improve ease of use.Intelligent blackboard structure of the present invention, structure is simple, easy to use, can be square in teaching process
Just the movement of blackboard is fast realized, while the pen that no longer needs to put forth energy writes oneself, so that blackboard is with automatic all clear
Except function and specific region remove function, it is no longer necessary to manually understand chalk writing, reduce the labor intensity of instructor, saving class
Hall instructional blocks of time.Blackboard structure of the invention can influence to avoid chalk powder to body compared with traditional blackboard.With intelligence
Can blackboard compare, without more complicated technology and problem at high cost, also not cumbersome function problem；Above structure can
Effectively solve problems of the prior art.
The blackboard display 2 of the intelligent blackboard structure includes blackboard display I 12 and blackboard display II 13, blackboard
The left sliding recess 3 of 1 left side medial surface of frame includes left sliding recess I 14 and left sliding recess II 15, in the right side of blackboard framework 1
The right sliding recess 4 of side includes right sliding recess I 16 and right sliding recess II 17.I 12 left side of blackboard display is set
Multiple left chain wheels I are set, each left chain wheel I is mounted on a left chain wheel bracket I, each left chain wheel bracket I and blackboard display I
Left elastic element I is set between 12, and left chain wheel I is installed on respectively in left sliding recess I 14, the I 12 right side setting of blackboard display
Multiple right pulley I, each right pulley I are mounted on right pulley bracket I, I 12 right side of each right pulley bracket I and blackboard display
Between a right elastic element I is set, each right pulley I is installed on respectively in right sliding recess I 16.Above structure, blackboard are aobvious
Show that device I 12 and blackboard display II 13 are connect with blackboard framework respectively, so as to move up and down respectively, movement is that blackboard is shown
Device is slided up and down by pulley, and it is convenient to operate.It is used respectively convenient for two blackboard displays.Blackboard display I 12 and blackboard are aobvious
When showing that device II 13 is staggered, writing can be shown simultaneously.
Multiple left chain wheels II are arranged in II 13 left side of blackboard display, and each left chain wheel II is mounted on a left chain wheel
On bracket II, left elastic element II is set, left chain wheel II blocks respectively between each left chain wheel bracket II and blackboard display II 13
In left sliding recess II 15, multiple right pulley II are arranged in II 13 right side of blackboard display, and each right pulley II is mounted on the right side
On pulley bracket II, a right elastic element II is arranged between II 13 right side in each right pulley bracket II and blackboard display, often
A right pulley II is installed on respectively in right sliding recess II 17.
Pen point pressure sensor is arranged in the pen tip position of the writing pencil, and pen point pressure sensor and control unit 11 connect
It connects, for the writing pencil when writing on blackboard display 2, it is real-time that pen point pressure sensor is configured to induction writing pressure
The structure of numerical value, pen point pressure sensor are configured to that writing pressure real time value is fed back to the knot of control unit 11 in real time
Structure.Above structure, the working principle of the blackboard display of pressure-sensitive magnetic board are to use electromagnetic induction technology.It is by writing pencil
Launch electromagnetic wave, senses that pressure value, pressure sensor calculate pen by the pressure sensor of marshalling on board
Position after feedback signal to control unit, control unit controls the mobile cursor on blackboard display and shows on blackboard display
Show writing.As long as corresponding position will show movement in this way, applying pressure in blackboard display corresponding position by writing pencil
The writing of cursor is convenient for instructor's on-the-spot teaching, it is no longer necessary to chalk.
The pen point pressure sensor will write pressure real time value when feeding back to control unit 11 in real time, control unit
11 are configured to send the structure of signal to the electromagnetic induction sensor of writing pencil writing part in real time, to control battery sense
Inductive sensing device shows the structure of the thickness writing directly proportional to writing pencil writing pressure size on blackboard display 2.It is above-mentioned
Structure, the pressure by the cooperation of writing pencil, blackboard display, control unit, pressure sensor, when can write writing pencil
Signal is changed into the writing of mobile cursor, convenient for normal teaching.
One key is set on the control unit 11 of the intelligent blackboard structure and removes button 18, user presses next key and removes
When button 18, a key is removed button 18 and is configured to 11 feedback signal of control unit, so that control unit 11 controls
The writing shown on blackboard display I 12 and blackboard display II 13 all realizes the structure removed.Above structure, a key are removed
After button is pressed, the writing on two blackboard displays can be understood simultaneously.The control unit 11 of the intelligent blackboard structure
Upper setting sectional displays remove button I 19, and when user presses sectional displays removing button I 19, sectional displays are removed
Button I 19 is configured to 11 feedback signal of control unit, is shown on blackboard display I 12 so that control unit 11 controls
The writing shown all realizes the structure removed.Sectional displays are arranged on the control unit 11 of the intelligent blackboard structure to remove
Button II 20, when user presses sectional displays removing button II 20, sectional displays are removed button II 20 and are configured to
To 11 feedback signal of control unit, all realized so that control unit 11 controls the writing shown on blackboard display II 13
The structure of removing.Above structure, each sectional displays understand button, can understand corresponding blackboard display after pressing automatically
On writing, convenient for writing handwriting again.
The blackboard display 2 of the intelligent blackboard structure is digital type magnetic board.It is selectable as blackboard display
Another embodiment, blackboard display can be digital type electromagnetism version.
Intelligent blackboard structure of the present invention, blackboard are intelligence structure, and blackboard display is movably arranged on blackboard framework
On, it can move up and down, and the effect of elastic element, apply tensile force between blackboard display and blackboard framework, so that only
There is the power of application upward or downward when on blackboard display, blackboard display can just move up and down, and otherwise can be in fixing shape
State is write on blackboard convenient for instructor.And blackboard display is pressure-sensitive magnetic board, through writing pencil on blackboard display
It writes, the pressure sensor at the position that writing pencil is write on blackboard display can experience pressure, thus in blackboard display
Show writing.And when needing to remove writing, by operation control portion part, control unit meeting feedback signal gives blackboard display, from
And the writing on blackboard display is removed.Chalk-writing is no longer needed when in this way, writing, is also no longer needed for manually logical
Blackboard eraser erasing out handwriting is crossed, to improve ease of use the problem of influencing instructor's health there is no dust pollution.
Intelligent blackboard structure of the present invention, is capable of the movement of convenient and efficient realization blackboard in teaching process, while no longer needing
Pen of putting forth energy writes oneself, enables to blackboard to have the function of automatic all remove and function is removed in specific region, it is no longer necessary to artificial
Understand chalk writing, reduce the labor intensity of instructor, saves the classroom instruction time.
Above in conjunction with attached drawing, an exemplary description of the invention, it is clear that concrete implementation of the present invention is not by above-mentioned
The limitation of mode, as long as using the various improvement that the inventive concept and technical scheme of the present invention carry out, or not improved by this
The conception and technical scheme of invention directly apply to other occasions, are within the scope of the invention.
Claims (10)
1. a kind of intelligent blackboard structure, it is characterised in that: the intelligent blackboard structure includes that blackboard framework (1), blackboard are shown
Left sliding recess (3) is arranged in device (2), blackboard framework (1) left side medial surface, and right sliding is arranged in medial surface on the right side of blackboard framework (1)
Multiple left chain wheels (5) are arranged in groove (4), blackboard display (2) left side, and each left chain wheel (5) is mounted on a left chain wheel bracket
(6) on, a left elastic element (7), each left cunning are set between each left chain wheel bracket (6) and blackboard display (2) left side
Wheel (5) is installed on respectively in left sliding recess (3), and multiple right pulley (8), each right pulley are arranged on the right side of blackboard display (2)
(8) it is mounted on a right pulley bracket (9), is arranged one between each right pulley bracket (9) and blackboard display (2) right side
Right elastic element (10), each right pulley (8) are installed on respectively in left sliding recess (3), and blackboard display (2) is pressure-sensitive electricity
Multiple rows of electromagnetic induction sensor component is arranged on blackboard display (2) in magnetic sheet, and every row's electromagnetic induction sensor component includes multiple
Electromagnetic induction sensor, the intelligent blackboard structure further include that can issue electromagnetic wave to the hand of each electromagnetic induction sensor
Pen is write, each electromagnetic induction sensor is connect with control unit (11) respectively, and control unit (11) is arranged in blackboard framework (1)
On.
2. intelligent blackboard structure according to claim 1, it is characterised in that: the blackboard of the intelligent blackboard structure is shown
Device (2) includes blackboard display I (12) and blackboard display II (13), the left sliding recess of medial surface on the left of blackboard framework (1)
It (3) include left sliding recess I (14) and left sliding recess II (15), the right sliding recess (4) of medial surface on the right side of blackboard framework (1)
Including right sliding recess I (16) and right sliding recess II (17).
3. intelligent blackboard structure according to claim 2, it is characterised in that: set on the left of the blackboard display I (12)
Multiple left chain wheels I are set, each left chain wheel I is mounted on a left chain wheel bracket I, each left chain wheel bracket I and blackboard display I
(12) left elastic element I is set between, and left chain wheel I is installed on respectively in left sliding recess I (14), and blackboard display I (12) is right
Multiple right pulley I are arranged in side, and each right pulley I is mounted on right pulley bracket I, each right pulley bracket I and blackboard display I
(12) a right elastic element I is set between right side, and each right pulley I is installed on respectively in right sliding recess I (16).
4. intelligent blackboard structure according to claim 2, it is characterised in that: set on the left of the blackboard display II (13)
Multiple left chain wheels II are set, each left chain wheel II is mounted on a left chain wheel bracket II, and each left chain wheel bracket II and blackboard are aobvious
Show and left elastic element II is set between device II (13), left chain wheel II is installed on respectively in left sliding recess II (15), and blackboard is shown
Multiple right pulley II are set on the right side of device II (13), and each right pulley II is mounted on right pulley bracket II, each right pulley bracket
A right elastic element II is set between II and blackboard display II (13) right side, each right pulley II is installed on right sliding respectively
In groove II (17).
5. intelligent blackboard structure according to claim 1 or 2, it is characterised in that: the pen tip position of the writing pencil is set
Pen point pressure sensor is set, pen point pressure sensor is connect with control unit (11), and the writing pencil is in blackboard display (2)
When upper writing, pen point pressure sensor is configured to the structure that pressure real time value is write in induction, and pen point pressure sensor is set
It is set to the structure that writing pressure real time value can be fed back to control unit (11) in real time.
6. intelligent blackboard structure according to claim 5, it is characterised in that: the pen point pressure sensor is in real time by book
When writing pressure real time value and feeding back to control unit (11), control unit (11) is configured in real time to writing pencil writing part
Electromagnetic induction sensor send signal structure, shown on blackboard display (2) to control battery inductive pick-up
The structure of the thickness writing directly proportional to writing pencil writing pressure size.
7. intelligent blackboard structure according to claim 2, it is characterised in that: the control unit of the intelligent blackboard structure
(11) key is set on and removes button (18), when user presses next key removing button (18), a key removes button (18) setting
For can to control unit (11) feedback signal so that control unit (11) control blackboard display I (12) and blackboard show
Show that the writing shown on device II (13) all realizes the structure removed.
8. intelligent blackboard structure according to claim 2, it is characterised in that: the control unit of the intelligent blackboard structure
(11) sectional displays are set on and remove button I (19), when user presses sectional displays removing button I (19), part is aobvious
Show that device is removed button I (19) and is configured to control unit (11) feedback signal, so that control unit (11) control is black
The writing shown on plate display I (12) all realizes the structure removed.
9. intelligent blackboard structure according to claim 2, it is characterised in that: the control unit of the intelligent blackboard structure
(11) sectional displays are set on and remove button II (20), when user presses sectional displays removing button II (20), part
Display is removed button II (20) and is configured to control unit (11) feedback signal, so that control unit (11) controls
The writing shown on blackboard display II (13) all realizes the structure removed.
10. intelligent blackboard structure according to claim 1, it is characterised in that: the blackboard of the intelligent blackboard structure is aobvious
Show that device (2) are digital type magnetic board.
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| CN201910151518.8A CN109872574B (en) | 2019-02-28 | 2019-02-28 | An intelligent blackboard structure |
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| CN201910151518.8A CN109872574B (en) | 2019-02-28 | 2019-02-28 | An intelligent blackboard structure |
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| CN109872574B CN109872574B (en) | 2020-12-18 |
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