CN113232441A - Electric blackboard eraser - Google Patents
Electric blackboard eraser Download PDFInfo
- Publication number
- CN113232441A CN113232441A CN202110691611.5A CN202110691611A CN113232441A CN 113232441 A CN113232441 A CN 113232441A CN 202110691611 A CN202110691611 A CN 202110691611A CN 113232441 A CN113232441 A CN 113232441A
- Authority
- CN
- China
- Prior art keywords
- wiping
- motor
- box
- dust
- blackboard eraser
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- 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
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Classifications
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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
- B43L21/02—Blackboard or slate cleaning devices with means for absorbing the chalk dust
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L21/00—Blackboard or slate cleaning devices
- B43L21/04—Wiper holders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
Abstract
The invention discloses an electric blackboard eraser, which comprises a moving device and an eraser device arranged on the moving device; the blackboard eraser device comprises an erasing dust-absorbing mechanism and a cleaning and drying mechanism; the wiping and dust-absorbing mechanism comprises a wiping box and a dust-absorbing fan which is arranged on the wiping box and is communicated with the inside of the wiping box; the wiping box is in a cube shape, a brush is arranged on the wiping surface, and dust collection channels communicated with the inside of the wiping box are arranged on two sides of the wiping surface; the cleaning and drying mechanism comprises a water collecting box and a plurality of air drying fans arranged on the water collecting box, and a plurality of atomizing nozzles for spraying water to the blackboard are arranged on the side vertical surface of one side of the water collecting box; the wiping box and the water collecting box are connected through the connecting frame and then are installed on the mobile device. The mobile device can wipe any place of the whole blackboard by simulating the motion condition of the arm when the blackboard is wiped manually; the dust absorption fan is utilized to reduce the internal pressure of the blackboard eraser, and dust is pressed into the blackboard eraser through the dust absorption channel under the action of external atmospheric pressure, so that the flying of the dust is greatly reduced.
Description
Technical Field
The invention relates to the technical field of teaching aids, in particular to an electric blackboard eraser.
Background
With the improvement of education attention and the increasing perfection of education facilities, the way of education and teaching also shows a diversified trend, multimedia teaching equipment becomes one of the teaching ways of most schools, but the traditional teaching mode is still an indispensable part in classroom teaching, and some laggard areas are still mainly based on traditional teaching. It is understood that the traditional teaching mode of blackboard writing is still the most used by teachers in class, so the traditional teaching mode has great application. The chalk syndrome caused by the traditional mode of blackboard-chalk-blackboard eraser becomes the first health hidden danger of teachers and students.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the electric blackboard eraser, which is used for preventing dust from diffusing to pollute the classroom environment and threaten the health of teachers and students and creating a clean, healthy and comfortable learning atmosphere for the teachers and students.
An electric blackboard eraser comprises a moving device and an eraser device arranged on the moving device;
the moving device comprises a horizontal moving mechanism and a longitudinal adjusting mechanism arranged on the horizontal moving mechanism;
the blackboard eraser device comprises a wiping ash sucking mechanism and a cleaning and drying mechanism;
the dust wiping and absorbing mechanism comprises a wiping box and a dust absorbing fan which is arranged on the wiping box and is communicated with the inside of the wiping box; the wiping box is in a cubic shape, a brush is arranged on a wiping surface, and dust collection channels communicated with the inside of the wiping box are arranged on two sides of the wiping surface;
the cleaning and drying mechanism comprises a water collecting box and a plurality of air drying fans arranged on the water collecting box, and a plurality of atomizing nozzles for spraying water to the blackboard are arranged on the side vertical surface of one side of the water collecting box;
the wiping box and the water collecting box are connected through the connecting frame and then are installed on the longitudinal adjusting mechanism.
Furthermore, the dust absorption fan is arranged on the side elevation opposite to the hairbrush,
a dust collection drawer is inserted below the dust collection fan on the wiping box.
Further, the horizontal moving mechanism comprises a lead screw and a nut seat sleeved on the lead screw, the lead screw is horizontally installed on a wall above the blackboard through an installation seat, and the lead screw is driven by a lead screw motor;
the longitudinal adjusting mechanism is installed on the nut seat.
Further, the longitudinal adjustment mechanism comprises a first adjustment assembly, a second adjustment assembly and a third adjustment assembly;
the first adjusting assembly comprises a first motor and a first cantilever, one end of the first cantilever is fixedly connected with a rotating shaft of the first motor, and the first cantilever is arranged along the radial direction of the rotating shaft of the first motor; the first motor is fixedly arranged on the nut seat through a mounting frame;
the second adjusting assembly comprises a second motor and a second cantilever, one end of the second cantilever is fixedly connected with a rotating shaft of the second motor, and the second cantilever is arranged along the radial direction of the rotating shaft of the second motor; the second motor is fixedly arranged at the other end of the first cantilever, and the first cantilever and the second cantilever swing in a vertical plane; the movable end of the second cantilever is provided with a door-shaped mounting frame, and the second cantilever is vertically connected to the top of the mounting frame;
the third adjusting assembly comprises an electric push rod, a third motor and a motor supporting plate, the third motor is installed on the motor supporting plate, and a rotating shaft of the third motor penetrates through the motor supporting plate from top to bottom and then is connected with the connecting frame;
the electric push rod rotates to be installed in the mounting frame, and the electric push rod is connected with the motor supporting plate after being movably worn out from the side wall of the mounting frame.
Furthermore, a mounting hole is formed in the water collecting box in a penetrating mode, the air drying fan is arranged in the mounting hole, and the triggering direction of the air drying fan is perpendicular to the water outlet direction of the atomizing spray head.
Furthermore, a water absorption sponge is arranged on the side vertical face of the water collection box, which is at the same side with the air outlet direction of the air drying fan.
Furthermore, the connecting frame comprises a plurality of connecting pipes, sleeves are vertically arranged on the wiping box and the water collecting box, and the connecting pipes are inserted in the sleeves and fixed with the sleeves through bolts screwed at the bottom ends.
The invention has the beneficial effects that:
the mobile device can wipe any place of the whole blackboard by simulating the motion condition of the arm when the blackboard is wiped manually; the dust absorption fan is utilized to reduce the internal pressure of the blackboard eraser, and dust is pressed into the blackboard eraser through the dust absorption channel under the action of external atmospheric pressure, so that the flying of the dust is greatly reduced; the blackboard can be further cleaned by arranging the water spraying mechanism, and the drying of the blackboard surface can be accelerated by arranging the water absorption sponge and the air drying fan; the electric push rod can generate friction between the blackboard eraser and the blackboard eraser, and the electric blackboard eraser is still suitable for a plurality of movable blackboards.
Drawings
Fig. 1 is a schematic structural diagram of an electric blackboard eraser according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a moving device of an electric blackboard eraser according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an eraser device of an electric blackboard eraser according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a wiping box of an electric blackboard eraser according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional structure view of a wiping box of an electric blackboard eraser according to an embodiment of the present invention;
fig. 6 is a first schematic structural diagram of a cleaning and drying mechanism of an electric blackboard eraser according to an embodiment of the present invention;
fig. 7 is a second schematic structural diagram of a cleaning and drying mechanism of an electric blackboard eraser according to an embodiment of the present invention.
Detailed Description
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
As shown in fig. 1 to 7, an embodiment of the present invention provides an electric blackboard eraser, which includes a moving device and an eraser device mounted on the moving device. The moving device comprises a horizontal moving mechanism and a longitudinal adjusting mechanism arranged on the horizontal moving mechanism, and the blackboard eraser device comprises a wiping dust-absorbing mechanism and a cleaning and drying mechanism. Wherein, the wiping and dust-absorbing mechanism comprises a wiping box 1 and a dust-absorbing fan 2 which is arranged on the wiping box 1 and is communicated with the inside of the wiping box 1; the wiping box 1 is in a cubic shape, a brush 3 is arranged on the wiping surface, and dust absorption channels 4 communicated with the inside of the wiping box 1 are arranged on two sides of the wiping surface. The cleaning and drying mechanism comprises a water collecting box 5 and a plurality of air drying fans 6 arranged on the water collecting box 5, a plurality of atomizing nozzles 7 used for spraying water to the blackboard are arranged on the vertical surface of one side of the water collecting box 5, a water inlet is formed in the top of the water collecting box 5, the water inlet is used for adding water into the water collecting box 5, and the water collecting box can be sealed through a cover. The wiping box 1 and the water collecting box 5 are connected through a connecting frame 8 and then are installed on the longitudinal adjusting mechanism.
Specifically, the dust collection fan 2 is installed on a side elevation opposite to the hairbrush 3, and a dust collection drawer 9 is inserted below the dust collection fan 2 on the wiping box 1. When the dust suction fan 2 works, negative pressure is formed in the wiping box 1, and after chalk dust brushed by the brush 3 is sucked into the wiping box 1 through the dust suction channel 4, the chalk dust falls in the dust collection drawer 9 under the action of gravity.
Specifically, the horizontal moving mechanism comprises a screw rod 10 and a nut seat 11 sleeved on the screw rod, the screw rod 10 is horizontally installed on a wall above the blackboard through a mounting seat 12, the screw rod 10 is driven by a screw rod motor, and the longitudinal adjusting mechanism is installed on the nut seat 11. The screw motor drives the screw 10 to rotate through the coupling, and drives the longitudinal adjusting mechanism to move in the horizontal direction through the nut seat 11.
In this embodiment, the longitudinal adjustment mechanism includes a first adjustment assembly, a second adjustment assembly, and a third adjustment assembly.
The first adjusting assembly comprises a first motor 13 and a first cantilever 14, one end of the first cantilever 14 is fixedly connected with a rotating shaft of the first motor 13, and the first cantilever 14 is arranged along the radial direction of the rotating shaft of the first motor 13; the first motor 13 is fixedly mounted on the nut base 11 through a mounting bracket 15.
The second adjusting assembly comprises a second motor 16 and a second cantilever 17, one end of the second cantilever 17 is fixedly connected with a rotating shaft of the second motor 16, and the second cantilever 17 is arranged along the radial direction of the rotating shaft of the second motor 16. The second motor 16 is fixedly mounted on the other end of the first boom 14, and both the first boom 14 and the second boom 17 swing in a vertical plane. The movable end of the second cantilever 17 is provided with a door-shaped mounting frame 18, and the second cantilever 17 is vertically connected to the top of the mounting frame 18.
The third adjusting component comprises an electric push rod 19, a third motor 20 and a motor supporting plate 21, the third motor 20 is installed on the motor supporting plate 21, and a rotating shaft of the third motor 20 penetrates through the motor supporting plate 21 from top to bottom and then is connected with the connecting frame 8. The electric push rod 19 is rotatably installed in the installation frame 18 through a bearing 26, and the electric push rod 19 movably penetrates out of the side wall of the installation frame 18 and then is connected with the motor support plate 21.
Specifically, the water collecting box 5 is provided with a mounting hole in a penetrating mode, the air drying fan 6 is arranged in the mounting hole, and the triggering direction of the air drying fan 6 is perpendicular to the water outlet direction of the atomizing nozzle 7. The water collecting box 5 is provided with the sponge 22 that absorbs water on the side facade of the air-out direction homonymy of air-dry fan 6, and the sponge 22 that absorbs water is used for wiping the drop of water that sprays on the blackboard face, makes things convenient for air-dry fan 6 to weather the blackboard face fast.
Further, the connecting frame 8 comprises a plurality of connecting pipes 23, sleeves 24 are vertically arranged on the wiping box 1 and the water collecting box 5, and the connecting pipes 23 are inserted in the sleeves 24 and fixed with the sleeves 24 through bolts 25 screwed at the bottom ends.
The working principle is as follows:
when the electric blackboard eraser does not work, the erasing dust-absorbing mechanism is positioned at the upper right corner of the blackboard, the electric push rod 19 is in a retraction state, and the brush 3 on the erasing box 1 is not contacted with the board surface of the blackboard.
When the electric blackboard eraser starts to work, the electric push rod 19 extends out to push the motor supporting plate 21 to be close to the blackboard surface, so that the brush 3 on the erasing box 1 is contacted with the blackboard surface, and the electric blackboard eraser generates friction force with the blackboard surface under the driving of the screw rod 10 to erase chalk marks. Meanwhile, the dust absorption fan 2 is started to reduce the pressure inside the wiping box 1 to generate negative pressure, chalk dust is sucked into the wiping box 1 through the dust absorption channel 4 under the action of external atmospheric pressure and is stored in the dust collection drawer 9, and the atomizing nozzle 7 synchronously starts to spray atomized water drops to the blackboard surface.
When the wiping case 1 moves to the leftmost end, the electric push rod 19 retracts, and the brush 3 on the wiping case 1 is no longer in contact with the blackboard surface. The screw rod motor drives the screw rod 10 to rotate reversely, the blackboard eraser device is driven to move to the rightmost end of the blackboard, the distance of one erasing box 1 is moved downwards under the driving of the first adjusting assembly and the second adjusting assembly, and the erasing process is repeated until the whole blackboard is erased. Then the wiping box 1 is driven by the screw rod 10, the first adjusting component and the second adjusting component to return to the upper right corner of the blackboard.
Then, the third motor 20 drives the water collecting box 5 to rotate 90 degrees anticlockwise through the connecting frame 8, the electric push rod 19 extends out, the water absorbing sponge 22 is contacted with the blackboard surface, water drops on the blackboard surface are cleaned, the water collecting box 5 starts to move leftwards under the driving of the screw rod 10, meanwhile, the three air drying fans 6 start to work, the blackboard surface is enabled to be dried quickly through a physical mode, and the water collecting box 5 returns to the upper right corner of the blackboard again to be used next time after wiping the whole blackboard according to the running track of the wiping box 1.
In conclusion, the mobile device can wipe any place of the whole blackboard by simulating the motion condition of the arm when the blackboard is manually wiped; the dust absorption fan is utilized to reduce the internal pressure of the blackboard eraser, and dust is pressed into the blackboard eraser through the dust absorption channel under the action of external atmospheric pressure, so that the flying of the dust is greatly reduced; the blackboard can be further cleaned by arranging the water spraying mechanism, and the drying of the blackboard surface can be accelerated by arranging the water absorption sponge and the air drying fan; the electric push rod can generate friction between the blackboard eraser and the blackboard eraser, and the electric blackboard eraser is still suitable for a plurality of movable blackboards.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. An electric blackboard eraser, which is characterized in that: comprises a mobile device and an eraser device arranged on the mobile device;
the moving device comprises a horizontal moving mechanism and a longitudinal adjusting mechanism arranged on the horizontal moving mechanism;
the blackboard eraser device comprises a wiping ash sucking mechanism and a cleaning and drying mechanism;
the dust wiping and absorbing mechanism comprises a wiping box (1) and a dust suction fan (2) which is arranged on the wiping box (1) and is communicated with the inside of the wiping box (1); the wiping box (1) is in a cubic shape, a brush (3) is arranged on a wiping surface, and dust collection channels (4) communicated with the inside of the wiping box (1) are arranged on two sides of the wiping surface;
the cleaning and drying mechanism comprises a water collecting box (5) and a plurality of air drying fans (6) arranged on the water collecting box (5), and a plurality of atomizing nozzles (7) used for spraying water to the blackboard are arranged on the side vertical surface of one side of the water collecting box (5);
the wiping box (1) and the water collecting box (5) are connected through a connecting frame (8) and then are installed on the longitudinal adjusting mechanism.
2. The electric blackboard eraser according to claim 1, characterized in that: the dust absorption fan (2) is arranged on the side elevation opposite to the hairbrush (3),
a dust collection drawer (9) is inserted below the dust collection fan (2) on the wiping box (1).
3. The electric blackboard eraser according to claim 1, characterized in that: the horizontal moving mechanism comprises a lead screw (10) and a nut seat (11) sleeved on the lead screw, the lead screw (10) is horizontally arranged on a wall above the blackboard through a mounting seat (12), and the lead screw (10) is driven by a lead screw motor;
the longitudinal adjusting mechanism is arranged on the nut seat (11).
4. The electric blackboard eraser according to claim 2, characterized in that: the longitudinal adjusting mechanism comprises a first adjusting component, a second adjusting component and a third adjusting component;
the first adjusting assembly comprises a first motor (13) and a first cantilever (14) with one end fixedly connected with a rotating shaft of the first motor (13), and the first cantilever (14) is arranged along the radial direction of the rotating shaft of the first motor (13); the first motor (13) is fixedly arranged on the nut seat (11) through a mounting frame (15);
the second adjusting assembly comprises a second motor (16) and a second cantilever (17) with one end fixedly connected with a rotating shaft of the second motor (16), and the second cantilever (17) is arranged along the radial direction of the rotating shaft of the second motor (16); the second motor (16) is fixedly arranged at the other end of the first cantilever (14), and the first cantilever (14) and the second cantilever (17) both swing in a vertical plane; a mounting frame (18) in a shape of a Chinese character 'men' is arranged at the movable end of the second cantilever (17), and the second cantilever (17) is vertically connected to the top of the mounting frame (18);
the third adjusting component comprises an electric push rod (19), a third motor (20) and a motor supporting plate (21), the third motor (20) is installed on the motor supporting plate (21), and a rotating shaft of the third motor (20) penetrates through the motor supporting plate (21) from top to bottom and then is connected with the connecting frame (8);
the electric push rod (19) is rotatably installed in the installation frame (18), and the electric push rod (19) is movably connected with the motor support plate (21) after penetrating out of the side wall of the installation frame (18).
5. The electric blackboard eraser according to claim 1, characterized in that: the water collecting box (5) is provided with a mounting hole in a penetrating mode, the air drying fan (6) is arranged in the mounting hole, and the triggering direction of the air drying fan (6) is perpendicular to the water outlet direction of the atomizing spray head (7).
6. The electric blackboard eraser according to claim 5, characterized in that: and a water absorption sponge (22) is arranged on the side vertical surface of the water collection box (5) and the air outlet direction of the air drying fan (6) at the same side.
7. The electric blackboard eraser according to claim 1, characterized in that: the connecting frame (8) comprises a plurality of connecting pipes (23), sleeves (24) are vertically arranged on the wiping box (1) and the water collecting box (5), and the connecting pipes (23) are inserted in the sleeves (24) and are fixed with the sleeves (24) through bolts (25) screwed at the bottom ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110691611.5A CN113232441A (en) | 2021-06-22 | 2021-06-22 | Electric blackboard eraser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110691611.5A CN113232441A (en) | 2021-06-22 | 2021-06-22 | Electric blackboard eraser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113232441A true CN113232441A (en) | 2021-08-10 |
Family
ID=77140655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110691611.5A Pending CN113232441A (en) | 2021-06-22 | 2021-06-22 | Electric blackboard eraser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113232441A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000326695A (en) * | 1999-05-24 | 2000-11-28 | Ichiro Yamahira | Replacing type blackboard wiper |
| KR20070000031A (en) * | 2005-06-24 | 2007-01-02 | 임기혁 | Board eraser |
| CN203126304U (en) * | 2013-04-10 | 2013-08-14 | 张秀兰 | Blackboard |
| CN103625182A (en) * | 2013-12-03 | 2014-03-12 | 徐春玲 | Dust-absorption blackboard eraser |
| CN204055096U (en) * | 2014-09-17 | 2014-12-31 | 何学成 | A kind of blackboard-cleaning dust pelletizing system |
| CN204296311U (en) * | 2014-12-11 | 2015-04-29 | 王丽真 | A kind of blackboard cleaning device |
| CN205112782U (en) * | 2015-11-19 | 2016-03-30 | 金展旭 | No dust combination formula blackboard eraser |
| CN205238961U (en) * | 2015-12-15 | 2016-05-18 | 西安科技大学 | Device is cleaned to telescopic blackboard |
| CN105730100A (en) * | 2016-04-15 | 2016-07-06 | 王维烨 | Clean, dustless and automatic blackboard wiping device |
| CN107199811A (en) * | 2017-04-19 | 2017-09-26 | 张有欢 | A kind of teaching automatic blackboard cleaning device |
| CN107933165A (en) * | 2017-11-15 | 2018-04-20 | 华北科技学院 | A kind of hand-held blackboard-cleaning device |
| TWI659868B (en) * | 2017-11-17 | 2019-05-21 | 國立彰化師範大學 | Dry-wet mechanical wiping board |
| CN209928643U (en) * | 2019-04-09 | 2020-01-10 | 潍坊职业学院 | Multifunctional teaching demonstration device |
-
2021
- 2021-06-22 CN CN202110691611.5A patent/CN113232441A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000326695A (en) * | 1999-05-24 | 2000-11-28 | Ichiro Yamahira | Replacing type blackboard wiper |
| KR20070000031A (en) * | 2005-06-24 | 2007-01-02 | 임기혁 | Board eraser |
| CN203126304U (en) * | 2013-04-10 | 2013-08-14 | 张秀兰 | Blackboard |
| CN103625182A (en) * | 2013-12-03 | 2014-03-12 | 徐春玲 | Dust-absorption blackboard eraser |
| CN204055096U (en) * | 2014-09-17 | 2014-12-31 | 何学成 | A kind of blackboard-cleaning dust pelletizing system |
| CN204296311U (en) * | 2014-12-11 | 2015-04-29 | 王丽真 | A kind of blackboard cleaning device |
| CN205112782U (en) * | 2015-11-19 | 2016-03-30 | 金展旭 | No dust combination formula blackboard eraser |
| CN205238961U (en) * | 2015-12-15 | 2016-05-18 | 西安科技大学 | Device is cleaned to telescopic blackboard |
| CN105730100A (en) * | 2016-04-15 | 2016-07-06 | 王维烨 | Clean, dustless and automatic blackboard wiping device |
| CN107199811A (en) * | 2017-04-19 | 2017-09-26 | 张有欢 | A kind of teaching automatic blackboard cleaning device |
| CN107933165A (en) * | 2017-11-15 | 2018-04-20 | 华北科技学院 | A kind of hand-held blackboard-cleaning device |
| TWI659868B (en) * | 2017-11-17 | 2019-05-21 | 國立彰化師範大學 | Dry-wet mechanical wiping board |
| CN209928643U (en) * | 2019-04-09 | 2020-01-10 | 潍坊职业学院 | Multifunctional teaching demonstration device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210810 |