CN111204160A - Automatic blackboard wiping device capable of isolating powder - Google Patents
Automatic blackboard wiping device capable of isolating powder Download PDFInfo
- Publication number
- CN111204160A CN111204160A CN202010194309.4A CN202010194309A CN111204160A CN 111204160 A CN111204160 A CN 111204160A CN 202010194309 A CN202010194309 A CN 202010194309A CN 111204160 A CN111204160 A CN 111204160A
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- blackboard
- wiping
- writing
- erasing
- rotary
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- 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
- B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
- B43L1/04—Blackboards
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- Drawing Aids And Blackboards (AREA)
Abstract
The invention discloses a powder-isolated automatic blackboard erasing device, which comprises an installation shell, a rotary blackboard component and a writing erasing component, wherein the writing blackboard is formed by rotating a writing board to the front side, when the writing blackboard is full of characters, a teacher drives a rotary blackboard driving mechanism to start, so that the writing board full of characters rotates backwards, the writing board positioned at the back side before rotates to the front side for the teacher to continuously write, and the teacher can drive a writing board erasing component to start to automatically erase the writing board full of characters after, erasing dust is isolated at the back of the writing board positioned at the front side and cannot float around, compared with the traditional way of erasing the blackboard through a blackboard eraser, the invention not only ensures that the teacher can continuously write, avoids the waste of class time caused by erasing the blackboard, but also isolates the erasing dust at the back of the writing board positioned at the front side, can not float everywhere, and reduces the harm of dust to students and teachers.
Description
Technical Field
The invention relates to the technical field of teaching aids, in particular to an automatic blackboard wiping device capable of isolating powder.
Background
In the teaching of chinese education, the blackboard plays important role, in traditional teaching, after the blackboard was written full of words, need use the blackboard eraser to clean the blackboard, can clean the in-process of word, the chalk dust flies upward everywhere, is inhaled internally by mr and student very easily, seriously influences student and mr's healthy, and mr cleans the blackboard simultaneously, and the time of giving lessons is wasted, reduces mr teaching quality.
Disclosure of Invention
Therefore, the invention aims to provide an automatic blackboard wiping device capable of isolating powder, which can improve the teaching quality of teachers and reduce the damage of dust to students and teachers.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:
a powder-insulated automatic wiping blackboard apparatus, comprising:
a mounting housing having a support plate;
the rotary blackboard assembly comprises a plurality of rotary blackboard mechanisms which are sequentially and transversely arranged at the top of the supporting plate and are provided with writing boards, and a rotary blackboard driving mechanism which is arranged in the mounting shell and drives the rotary blackboard mechanisms to rotate vertical to the plane of the supporting plate;
the writing board wiping component comprises a wiping mechanism which can move transversely along the supporting plate and sequentially wipes the writing board on the back of the rotary blackboard mechanism, and a wiping driving mechanism which is arranged in the mounting shell and drives the wiping mechanism to move transversely along the supporting plate;
wherein, it is a plurality of rotatory blackboard mechanism links, and every a plurality of in the rotatory blackboard mechanism the clipboard connects gradually the closure, works as when the clipboard rotated to the front, it is a plurality of rotatory blackboard mechanism is located the clipboard on front and links up in proper order and forms the writing blackboard.
As a preferable aspect of the automatic blackboard erasing device for isolating powder according to the present invention, the rotating blackboard mechanism further includes:
one end of the transmission shaft is inserted into a space formed by sequentially connecting and closing the plurality of writing boards, and the other end of the transmission shaft penetrates through the bottom of the supporting plate and is connected with a first driven wheel;
the transmission support piece is located in the space that the clipboard connects gradually closed formation, and with a plurality of the clipboard one-to-one sets up, its one end with the interior wall connection of clipboard, another tip is fixed on the transmission shaft.
As a preferable aspect of the powder-isolated automatic blackboard erasing device of the present invention, the rotary blackboard driving mechanism includes:
the stepping motor is arranged at the top of the bottom plate of the mounting shell;
and the first driving wheel is arranged on the rotating shaft of the stepping motor and is meshed with the first driven wheel.
As a preferable scheme of the automatic blackboard erasing device for isolating powder, the top of the supporting plate is provided with a transverse limiting groove;
the wiping mechanism includes:
the wiping walking part is perpendicular to the supporting plate, and the bottom end of the wiping walking part penetrates through the limiting groove to the bottom of the supporting plate and is connected with the wiping driving mechanism;
a rotating support member, one end of which is hinged with the wiping walking member;
a wiping plate hinged with the other end of the wiping walking piece;
one end of the buffer supporting piece is hinged with the wiping walking piece, and the other end of the buffer supporting piece is hinged with the rotating supporting piece;
when the included angle between the rotating support piece and the wiping plate becomes smaller, the buffering support piece is compressed, and when the included angle between the rotating support piece and the wiping plate becomes larger, the buffering support piece is extended.
As a preferable aspect of the automatic blackboard erasing device with powder isolation according to the present invention, the erasing driving mechanism includes:
the servo motor is arranged at the top of the bottom plate of the mounting shell;
the second driving wheel is arranged on a rotating shaft of the stepping motor;
two ends of the screw rod are fixed on the top of the bottom plate of the mounting shell through the supporting seat;
the second driven wheel is fixed at the end part of the screw rod and is meshed with the second driving wheel;
one end of the spiral moving piece is connected with the spiral rod, and the other end of the spiral moving piece is connected with the wiping walking piece;
wherein, when the screw rod rotates, the screw moving member moves axially along the screw rod.
As a preferable aspect of the automatic blackboard erasing device for isolating powder according to the present invention, the erasing mechanism further includes a support shaft having one end fixed to the erasing roller and symmetrically distributed on both sides of the limit groove, and a roller connected to the support shaft and contacting the support plate.
As a preferable mode of the automatic blackboard erasing device with powder isolation according to the present invention, each of the rotary blackboard mechanisms has three writing boards, and a cross-sectional shape of a space surrounded by the three writing boards is an equilateral triangle.
Compared with the prior art, the invention has the beneficial effects that: the writing blackboard is formed by rotating the writing boards on the rotating blackboard mechanisms arranged in line to the front side, when the writing blackboard is full of characters, the teacher can drive the rotary blackboard driving mechanism to start, drive the writing board full of characters to rotate backwards, and the previously rearward positioned tablet is rotated to the front for the teacher to continue writing, and the teacher may actuate the tablet-wiping assembly to activate, compared with the traditional mode of wiping the blackboard through the blackboard eraser, the blackboard eraser has the advantages that on one hand, a teacher can write continuously, the waste of class time caused by wiping the blackboard is avoided, on the other hand, the wiping dust is isolated on the back of the front writing board and cannot float everywhere, and the harm of the dust to students and the teacher is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise. Wherein:
FIG. 1 is a front view of an automatic blackboard erasing apparatus for isolating powder according to the present invention;
FIG. 2 is a schematic view showing a part of the structure of a direction of an automatic blackboard erasing apparatus for isolating powder according to the present invention;
FIG. 3 is a schematic view showing a partial structure of an automatic blackboard erasing device for isolating powder in another direction according to the present invention;
FIG. 4 is a partial structural plan view of an automatic blackboard erasing apparatus for isolating powder according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and it will be apparent to those of ordinary skill in the art that the present invention may be practiced without departing from the spirit and scope of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, wherein for convenience of illustration, the cross-sectional view of the device structure is not enlarged partially according to the general scale, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The invention provides an automatic blackboard wiping device capable of isolating powder, which can improve the teaching quality of teachers and reduce the damage of dust to students and teachers.
Referring to fig. 1 to 4, which are schematic structural views illustrating an embodiment of an automatic powder-isolating blackboard erasing apparatus according to the present invention, referring to fig. 1 to 4, the automatic powder-isolating blackboard erasing apparatus according to the present embodiment includes: a mounting housing 100, a rotating blackboard assembly 200, a writing board wiper assembly 300.
The mounting case 100 is used for fixedly mounting the rotary blackboard driving mechanism 220 on the rotary blackboard assembly 200 and the wiping driving mechanism 320 on the writing board wiping assembly 300, and powder wiped from the rotary blackboard mechanism 210 is blocked inside, so that chalk dust is prevented from flying around.
The rotary blackboard assembly 200 includes a rotary blackboard mechanism 210 disposed on the top of the support plate 110 and a rotary blackboard driving mechanism 220 disposed in the installation housing 100 and driving the rotary blackboard mechanism 210 to rotate perpendicular to the plane of the support plate 110, the rotary blackboard mechanisms 210 are linked and sequentially and laterally arranged to form a writing blackboard, when the surface of the writing blackboard needs to be wiped, the rotary blackboard 210 is driven to rotate by the rotary blackboard driving mechanism 220, so that a face with fonts rotates into the installation housing 100 and is wiped by the wiping mechanism 310 on the blackboard wiping assembly 300, specifically, in this embodiment, the rotary blackboard mechanism 220 is composed of a writing board 210a, a transmission shaft 210b and a transmission support member 210c, the writing boards 210a on each rotary blackboard mechanism 210 are sequentially connected and closed, when the writing board 210a rotates to the front, the writing boards 210a on the front of the rotary blackboard mechanisms 210 are sequentially connected to form a writing board, in the present embodiment, the rotary blackboard driving mechanism 220 is composed of a stepping motor 220a and a first driving wheel 220b, the stepping motor 220a is disposed on the top of the bottom plate of the mounting case 100, the first driving wheel 220b is disposed on the rotating shaft of the stepping motor 220a and engaged with the first driven wheel 210b-1, when the writing board 210a located on the front surface and fully written with characters is required to be turned over into the mounting case 100, and the writing board 210 located in the mounting case 100 is turned over to the front surface to form a new writing board, the stepping motor 220a drives the first driving wheel 220b to rotate, the first driving wheel 220b transmits the driving force of the stepping motor 220a to the transmission shaft 210b through the first driven wheel 210b-1, the transmission shaft 210b drives the writing board 210a to rotate through the transmission support member 210c, as the rotary blackboard mechanisms 210 are sequentially linked, when one rotary blackboard mechanism 210 rotates, the other rotary blackboard mechanisms 210 also rotate, therefore, the writing boards 210a with characters on the front surfaces of all the rotary blackboard mechanisms 210 rotate to the back surfaces to wait for wiping, and the writing boards 210a on the back surfaces rotate to the front surfaces and are sequentially arranged to form new writing blackboards for teachers to write.
The writing board wiping assembly 300 includes a wiping mechanism 310 which can move transversely along the supporting plate 110 and sequentially wipe the writing board 210a on the back of the rotary blackboard mechanism 210, and a wiping driving mechanism 320 which is disposed in the mounting case 100 and drives the wiping mechanism 310 to move transversely along the supporting plate 110, and specifically, in the present embodiment, the wiping mechanism 310 includes a wiping walking member 310a, a rotary supporting member 310b, a wiping plate 310c, and a buffering supporting member 310d, the wiping walking member 310a is disposed perpendicularly to the supporting plate 110, the bottom end of the wiping walking member 310a passes through the limiting groove 110a to the bottom of the supporting plate 110 and is connected to the wiping driving mechanism 320, one end of the rotary supporting member 310b is hinged to the wiping walking member 310a, the wiping plate 310c is hinged to the other end of the wiping walking member 310a, one end of the buffering supporting member 310d is hinged to the wiping walking member 310a, and the other, and, when the included angle between the rotary support 310b and the wiping plate 310c becomes smaller, the buffering support 310d is compressed, and when the included angle between the rotary support 310b and the wiping plate 310c becomes larger, the buffering support 310d is extended, in this embodiment, the wiping driving mechanism 320 includes a servo motor 320a, a second driving wheel 320b, a screw rod 320c, a second driven wheel 320d, and a screw moving member 320e, the servo motor 320a is disposed on the top of the bottom plate of the installation casing 100, the second driving wheel 320b is disposed on the rotating shaft of the servo motor 320a, both ends of the screw rod 320c are fixed on the top of the bottom plate of the installation casing 100 through a supporting seat, the second driven wheel 320d is fixed on the end of the screw rod 320c and engaged with the second driving wheel 320b, one end of the screw moving member 320e is connected with the screw rod 320c, and the other end is connected with the wiping walking member 310a, in this embodiment, the spiral moving member 320e includes a sleeve (not marked in the drawing) engaged with the wiping walking member 310a and a spiral ring (not marked in the drawing) connected with the bottom of the sleeve, the wiping walking member 310a is inserted into the sleeve and fixedly connected with the spiral moving member 320e, an inner ring of the spiral ring is provided with a spiral groove, the spiral ring is coaxially assembled with the spiral rod 320c, and a ball is disposed between the spiral groove of the inner ring of the spiral ring and a track formed by the spiral groove on the spiral rod 320c, at this time, the spiral moving member 320e is fixed with the wiping walking member 310a, and since the longitudinal position of the wiping walking member 310a is limited by the limiting groove 110a, the longitudinal position of the spiral moving member 320e is also limited, and when the spiral rod 320c rotates, since the ball rolls in the formed track, the spiral moving member 320e will move together with the wiping walking member 310a in the direction of the limiting groove 110a, the wiping mechanism 310 is driven by the wiping driving mechanism 320 as follows: the servo motor 320a drives the second driving wheel 320b to rotate, the second driving wheel 320b drives the screw rod 320c to rotate clockwise through the second driven wheel 320d, at this time, the screw rod 320c drives the screw moving member 320e to move along the direction of the spacing groove 110a, and further drives the wiping walking member 310a to move along the direction of the spacing groove 110a, during the forward walking of the wiping walking member 310a, the wiping plate 310c is always attached to the writing board 210a rotated to the back side and having the fonts due to the buffering support of the buffering support member 310d, and as the wiping walking member 310a moves forward, the wiping plate 310c wipes the fonts on the writing board 310a having the fonts, and the powder formed by the wiping is blocked by the installation case 100 inside, and when the wiping of the tablet 310a is completed completely, the servo motor 320a drives the second capstan 320b to rotate in reverse, and the wiping mechanism 310 is retracted to the original position.
Referring to fig. 1 to 4, the automatic blackboard erasing device for isolating powder according to the present embodiment operates as follows during the teaching of the teacher: when a teacher writes a character in class, the teacher writes on the front writing board 210a, and when the front writing board 210a is full of characters, the teacher presses an operation button of the rotary blackboard driving mechanism 220, the rotary blackboard driving mechanism 220 drives one of the rotary blackboard mechanisms 210 to rotate, and since the plurality of rotary blackboard mechanisms 210 are linked, when the rotary blackboard mechanism 210 rotates, the remaining rotary blackboard mechanisms 210 rotate synchronously, so that each writing board 210a with characters in the rotary blackboard mechanism 210 rotates to the back, and a blank writing board 210a originally located at the back rotates to the front for the teacher to write, and when the writing board 210a with characters rotates to the back and is parallel to the wiping board 310c on the writing board wiping assembly 300, the rotary blackboard driving mechanism 220 is powered off, and then the teacher presses a driving button of the wiping driving mechanism 320, the wiping driving mechanism 320 drives the wiping mechanism 310 to move laterally along the supporting plate 110 to wipe the writing board 210a with fonts on the back surface, and after the wiping of the writing board 310a is completed, the wiping mechanism 310 returns to the original position to wait for the next wiping.
In order to further improve the stability of the wiping mechanism 310 during wiping, referring to fig. 2 again, in this embodiment, a supporting shaft 310e may be symmetrically fixed on the sidewall of the wiping walking member 310a, a roller 310f is connected to a free end of the supporting shaft 310e, and a bottom of the roller 310f contacts with a top of the supporting plate 110, and during wiping of the wiping mechanism 310, the roller 310f slides on the top of the supporting plate 110 to support the wiping walking member 310 a.
In order to further improve the non-interference performance and the connection tightness of the writing boards 210a on two adjacent rotary blackboard mechanisms 210 during the rotation of the plurality of rotary blackboard mechanisms 210, please refer to fig. 4 again, in this embodiment, each rotary blackboard mechanism 210 has three writing boards 210a, and the cross-sectional shape of the space surrounded by the three writing boards 210a is an equilateral triangle, when the rotary blackboard mechanisms 210 rotate in a linkage manner, the writing boards 210a on two adjacent rotary blackboard mechanisms 210 do not interfere with each other, and when the writing boards 210a on the front surfaces of two adjacent rotary blackboard mechanisms 210 form a writing blackboard, the gap between the two adjacent writing boards 210a on the front surfaces is small, which is convenient for a teacher to write.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. An automatic blackboard erasing device with powder isolation, comprising:
a mounting case (100) having a support plate (110);
the rotary blackboard assembly (200) comprises a plurality of rotary blackboard mechanisms (210) which are sequentially and transversely arranged at the top of the supporting plate (110) and are provided with writing boards (210a), and a rotary blackboard driving mechanism (220) which is arranged in the mounting shell (100) and drives the rotary blackboard mechanisms (210) to rotate perpendicular to the plane of the supporting plate (110);
a writing board wiping unit (300) including a wiping mechanism (310) which is movable laterally along the support plate (110) and sequentially wipes the writing board (210a) on the back side of the rotary blackboard mechanism (210), and a wiping drive mechanism (320) which is provided in the installation case (100) and drives the wiping mechanism (310) to move laterally along the support plate (110);
wherein, it is a plurality of rotatory blackboard mechanism (210) linkage, and every a plurality of on rotatory blackboard mechanism (210) clipboard (210a) connect gradually the closure, work as when clipboard (210a) rotated to the front, it is a plurality of rotatory blackboard mechanism (210) are located clipboard (210a) on the front and link up in proper order and form the blackboard of writing.
2. The powder insulated automatic wiping blackboard apparatus according to claim 1, wherein the rotating blackboard mechanism (210) further includes:
one end of the transmission shaft (210b) is inserted into a space formed by sequentially connecting and closing the writing boards (210a), and the other end of the transmission shaft penetrates through the bottom of the supporting plate (110) and is connected with a first driven wheel (210 b-1);
the driving support piece (210c) is positioned in a space formed by sequentially connecting and closing the writing boards (210a), and is arranged in a one-to-one correspondence manner with the writing boards (210a), one end part of the driving support piece is connected with the inner wall of the writing board (210a), and the other end part of the driving support piece is fixed on the driving shaft (210 b).
3. The automatic powder-cutoff blackboard erasing device according to claim 2, wherein the rotary blackboard driving mechanism (220) includes:
a stepping motor (220a) disposed on the top of the bottom plate of the mounting case (100);
and the first driving wheel (220b) is arranged on the rotating shaft of the stepping motor (220a) and is meshed with the first driven wheel (210 b-1).
4. The automatic blackboard erasing device for isolating powder according to claim 1, wherein the top of the support plate (110) is opened with a horizontal limit groove (110 a);
the wiping mechanism (310) includes:
the wiping walking part (310a) is perpendicular to the supporting plate (110), and the bottom end of the wiping walking part penetrates through the limiting groove (110a) to the bottom of the supporting plate (110) and is connected with the wiping driving mechanism (320);
a rotating support (310b) having one end hinged to the wiping chassis (310 a);
a wiping plate (310c) hinged to the other end of the wiping chassis (310 a);
a buffering support (310d) having one end hinged to the wiping walking member (310a) and the other end hinged to the rotating support (310 b);
wherein the buffering support (310d) is compressed when an angle between the rotating support (310b) and the wiping plate (310c) becomes smaller, and the buffering support (310d) is elongated when an angle between the rotating support (310b) and the wiping plate (310c) becomes larger.
5. A powder-insulated automatic-wiping blackboard apparatus according to claim 4, wherein the wiping drive mechanism (320) includes:
a servo motor (320a) disposed on the top of the bottom plate of the mounting case (100);
the second driving wheel (320b) is arranged on the rotating shaft of the stepping motor (320 a);
the two ends of the screw rod (320c) are fixed on the top of the bottom plate of the mounting shell (100) through a supporting seat;
a second driven pulley (320d) fixed to an end of the screw bar (320c) and engaged with the second driving pulley (320 b);
a screw moving member (320e) having one end connected to the screw bar (320c) and the other end connected to the wiping walking member (310 a);
wherein the screw moving member (320e) moves axially along the screw rod (320c) when the screw rod (320c) rotates.
6. The automatic blackboard erasing apparatus with powder isolation according to claim 4 or 5, wherein the erasing mechanism (310) further includes a supporting shaft (310e) having one end fixed to the erasing runner (310a) and symmetrically distributed at both sides of the spacing groove (110a), and a roller (310f) connected to the supporting shaft (310e) and contacting the supporting plate (110).
7. The automatic powder-isolating blackboard erasing apparatus according to claim 1, wherein each of the rotary blackboard mechanisms (210) has three writing boards (210a), and the cross-sectional shape of the space surrounded by the three writing boards (210a) is an equilateral triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010194309.4A CN111204160A (en) | 2020-03-19 | 2020-03-19 | Automatic blackboard wiping device capable of isolating powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010194309.4A CN111204160A (en) | 2020-03-19 | 2020-03-19 | Automatic blackboard wiping device capable of isolating powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111204160A true CN111204160A (en) | 2020-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010194309.4A Pending CN111204160A (en) | 2020-03-19 | 2020-03-19 | Automatic blackboard wiping device capable of isolating powder |
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| Country | Link |
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| CN (1) | CN111204160A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113135059A (en) * | 2021-05-27 | 2021-07-20 | 浙江工业职业技术学院 | Blackboard with multiple combination types |
| CN113212039A (en) * | 2021-05-23 | 2021-08-06 | 安徽米未教育科技有限责任公司 | Automatic blackboard wiping device capable of avoiding dust |
| CN113276584A (en) * | 2021-01-20 | 2021-08-20 | 河南应用技术职业学院 | Multimedia teaching device |
-
2020
- 2020-03-19 CN CN202010194309.4A patent/CN111204160A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113276584A (en) * | 2021-01-20 | 2021-08-20 | 河南应用技术职业学院 | Multimedia teaching device |
| CN113212039A (en) * | 2021-05-23 | 2021-08-06 | 安徽米未教育科技有限责任公司 | Automatic blackboard wiping device capable of avoiding dust |
| CN113135059A (en) * | 2021-05-27 | 2021-07-20 | 浙江工业职业技术学院 | Blackboard with multiple combination types |
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