CN108583083A - A kind of drum-type dustproof blackboard - Google Patents
A kind of drum-type dustproof blackboard Download PDFInfo
- Publication number
- CN108583083A CN108583083A CN201810512581.5A CN201810512581A CN108583083A CN 108583083 A CN108583083 A CN 108583083A CN 201810512581 A CN201810512581 A CN 201810512581A CN 108583083 A CN108583083 A CN 108583083A
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- CN
- China
- Prior art keywords
- type
- soft
- plate face
- roller
- belt pulley
- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
- B43L1/04—Blackboards
- B43L1/08—Blackboards flexible
-
- 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
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- Drawing Aids And Blackboards (AREA)
Abstract
The present invention relates to a kind of drum-type dustproof blackboards, including soft-type to write plate face, fixed frame, transmission mechanism, projection arrangement, circuit control device, clearing apparatus, dust collecting, deep clean device.Stepper motor rotates, and soft-type is driven to write plate face rotation by belt pulley and driving drum, meanwhile starting clearing apparatus, to realize the automatic erasing for writing plate face to soft-type, later, dust collecting can be cleared up and collected automatically to the dust on hairbrush, when writing plate face by deep clean device, be humidified by water mist, then it is dried, to realize the deep clean to plate face.The drum-type dustproof blackboard has the characteristics that function is more, dust-proof, labor-saving, efficient, environmentally friendly, easy to operate.
Description
Technical field
The present invention relates to a kind of blackboard, more particularly to a kind of drum-type dustproof blackboard.
Background technology
Currently, the most still traditional blackboard of instructional device that middle and primary schools, colleges and universities etc. use adds the combination of projection device,
Dust greatly threatens the health of teacher, classmate, although occurred in the market some Multifunctional teaching devices and
Dust-proof blackboard eraser etc., but still cannot fundamentally solve the FAQs such as dust pollution, inefficiency, complicated for operation.
Invention content
The purpose of the present invention is to solve existing issues, provide a kind of drum-type dustproof blackboard.
The present invention is achieved through the following technical solutions：
A kind of drum-type dustproof blackboard, including soft-type write plate face, plank, fixed frame, transmission mechanism, projection arrangement,
Circuit control device, clearing apparatus, dust collecting, deep clean device.It is characterized in that:Transmission mechanism includes stepper motor
One, belt one, big belt pulley one, small belt pulley one, driving drum, the first bend pulley, second bend pulley and third changed course
Roller, the small belt pulley one are mounted on stepper motor one, and the stepper motor one is mounted on fixed frame by bolt
Upper right side, the big belt pulley one are mounted in driving drum, and the driving drum both sides are with bearing fit and mounted on fixation
The top of frame, the belt one are wire-wrapped on big belt pulley one and small belt pulley one, first bend pulley both sides and axis
Hold and be mounted below fixed frame with merging, the second bend pulley and third bend pulley both sides respectively with bearing fit simultaneously
It is symmetrically arranged on the centre position of fixed frame, the fixed frame is bolted on metope；Clearing apparatus includes step
Stepper motor two, belt two, big belt pulley two, small belt pulley two, the roller with hairbrush and dust cover one, the small belt pulley
Two are mounted on stepper motor two, and the stepper motor two is mounted on by bolt on dust cover one, the big belt pulley two
On the roller with hairbrush, the belt two is wire-wrapped on big belt pulley two and small belt pulley two, described to carry hairbrush
Roller both sides and bearing fit and on dust cover one, the dust cover one is mounted on fixed frame by bolt
On；Dust collecting includes hard hair brush bar, dust cover two and dust collecting box, and the hard hair brush bar is pacified by bolt
On dust cover two, the dust cover two is mounted on the lower section of dust cover one, the dust collecting box by bolt
It is placed in the U-type groove of two lower section of dust cover, and may pass through the hole extraction reserved on fixed frame；Deep clean device includes
Supporting rack, air blower, water tank, the roller with sponge, filler pipe, outlet pipe, sparge pipe, escape pipe, air jet pipe, holder one, branch
Frame two, holder three, holder four, the air blower are mounted on by bolt above supporting rack, and described escape pipe one end is connected to drum
On wind turbine, the other end passes through the preformed hole on supporting rack to be connected with air jet pipe, and the air jet pipe passes through holder one and holder two
It is installed in below supporting rack, the holder one and holder two are identical, and are symmetrically mounted on supporting rack both sides by bolt, described
Water tank is mounted on by bolt above supporting rack, and described filler pipe one end is mounted on water tank, and the other end is pierced by fixed frame
Preformed hole, add water to facilitate for water tank, described outlet pipe one end is connected to below water tank, and the other end passes through pre- on supporting rack
It boxes out and is connected with sparge pipe, the sparge pipe is installed in by holder three and holder four on supporting rack, three He of the holder
Holder four is identical, and is symmetrically mounted on supporting rack both sides by bolt, and the roller both sides of the band sponge and bearing fit are simultaneously pacified
On supporting rack, support frame as described above is mounted on by bolt on fixed frame.
As the preferred technical solution of the present invention, the plank is mounted on by screw in fixed frame, and when writing is used for
Soft-type is supported to write plate face, it is rubber strip that the soft-type, which writes plate face, and the soft-type writes plate face solderless wrapped connection in driving drum and the
On one bend pulley, the driving drum drives soft-type to write plate face rotation by friction, and first bend pulley, second change
It is responsible for changing the rotation direction of soft-type writing plate face to roller and third bend pulley.
As the preferred technical solution of the present invention, the roller with hairbrush should be with soft-type clipboard face paste when installing
Closely, the stepper motor two drives the roller with hairbrush to rotate by belt two, big belt pulley two and small belt pulley two, with reality
The wiping of plate face is now write to soft-type；It should be with the roller with hairbrush close to ensure to work as band when the hard hair brush bar installation
When thering is the roller of hairbrush to rotate, the dust being adhered on the roller with hairbrush can be cleared up by hard hair brush bar；
The sparge pipe is hollow pipe, and there are the uniform apopores of a row, and when the sparge pipe is installed, apopore is write towards soft-type
Plate face is simultaneously close with soft-type clipboard face paste, and the water tank is write plate face to soft-type by outlet pipe and sparge pipe and humidified；Institute
It is hollow pipe to state air jet pipe, and there are the uniform ventholes of a row, and when the air jet pipe is installed, venthole is towards soft-type clipboard
Face is simultaneously close with soft-type clipboard face paste, and the air blower writes plate face by escape pipe and air jet pipe to soft-type dries；Institute
It is the roller that surface is cased with one layer of sponge to state the roller with sponge, and plate face should be write with soft-type when the roller of the band sponge is installed
It is adjacent to, when the soft-type writes plate face rotation, drives the roller rotation with sponge, to ensure to write soft-type the cleaning of plate face.
As the preferred technical solution of the present invention, the circuit control device includes shell, control panel, and the shell is logical
The outside that bolt is mounted on fixed frame is crossed, the control panel is installed inside the shell by screw, and for controlling blackboard
Action and start and stop；The projection arrangement is mounted on the top of fixed frame, and projecting apparatus is coordinated to work.
The beneficial effects of the invention are as follows：The present invention provides a kind of drum-type dustproof blackboards, including soft-type to write plate face, consolidate
Determine frame, transmission mechanism, projection arrangement, circuit control device, clearing apparatus, dust collecting, deep clean device.Stepping
Motor rotates, and drives soft-type to write plate face rotation by belt pulley and driving drum, meanwhile, start clearing apparatus, to realize
The automatic erasing of plate face is write to soft-type, later, dust collecting can be cleared up and collected automatically to the dust on hairbrush,
It when writing plate face by deep clean device, is humidified by water mist, is then dried, to realize the deep clean to plate face.
The drum-type dustproof blackboard has the characteristics that function is more, dust-proof, labor-saving, efficient, environmentally friendly, easy to operate.
Description of the drawings
Fig. 1 is the floor map of drum-type dustproof blackboard of the present invention
Fig. 2 is the plane and schematic view of the mounting position of drum-type dustproof blackboard of the present invention
Fig. 3 a are transmission mechanism installation site partial schematic diagram of the present invention
Fig. 3 b are the right view of Fig. 3 a
Fig. 4 is clearing apparatus plane of the present invention and schematic view of the mounting position
Fig. 5 a are clearing apparatus of the present invention and dust collecting structure and schematic view of the mounting position
Fig. 5 b are clearing apparatus of the present invention and the left sectional view of dust collecting device
Fig. 6 is clearing apparatus of the present invention and dust collecting plane and schematic view of the mounting position
Fig. 7 a are deep clean device plane of the present invention and installation site partial schematic diagram
Fig. 7 b are deep clean device plane of the present invention and schematic view of the mounting position
Fig. 7 c are deep clean apparatus structure of the present invention and schematic view of the mounting position
In figure：1 fixed frame, 2 transmission mechanisms, 3 clearing apparatus, 4 dust collectings, 5 circuit control devices, 6 depth
Cleaning device, 7 soft-type write plate face, 8 projection arrangements, 9 planks；Wherein transmission mechanism 2 further includes：201 driving drums, 202
One bend pulley, 203 second bend pulleys, 204 third bend pulleys, 205 stepper motors one, 206 big belt pulleys one, 207 skins
Band one, 208 small belt pulleys one；Wherein clearing apparatus 3 further includes：301 carry the roller of hairbrush, and 302 stepper motors two, 303 is anti-
Dirt shell one, 304 small belt pulleys two, 305 belts two, 306 big belt pulleys two；Wherein dust collecting 4 further includes：401 is anti-
Dirt shell two, 402 dust collecting boxes, 403 hard hair brush bars；Wherein circuit control device 5 further includes：501 shells, 502 controls
Panel；Wherein deep clean device 6 further includes：601 air blowers, 602 filler pipes, 603 water tanks, 604 outlet pipes, 605 escape pipes,
606 holders one, 607 sparge pipes, 608 supporting racks, 609 rollers with sponge, 610 holders two, 611 air jet pipes, 612 holders three,
613 holders four.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Please refer to Fig.1, Fig. 2, Fig. 3 a, Fig. 3 b, Fig. 4, Fig. 5 a, Fig. 5 b, Fig. 6, Fig. 7 a, Fig. 7 b, Fig. 7 c, Fig. 1 be the present invention
The floor map of drum-type dustproof blackboard, Fig. 2 are the plane and schematic view of the mounting position of drum-type dustproof blackboard of the present invention, figure
3a is linkage section schematic view of the mounting position of the present invention, and Fig. 3 b are the right view of Fig. 3 a, and Fig. 4 is flat for clearing apparatus of the present invention
Face and schematic view of the mounting position, Fig. 5 a are clearing apparatus of the present invention and dust collecting structure and schematic view of the mounting position, figure
5b is clearing apparatus of the present invention and the left sectional view of dust collecting, and Fig. 6 is that clearing apparatus of the present invention and dust collecting are flat
Face and schematic view of the mounting position, Fig. 7 a are deep clean device plane of the present invention and installation site partial schematic diagram, and Fig. 7 b are this
Invention deep clean device plane and schematic view of the mounting position, Fig. 7 c are that deep clean apparatus structure of the present invention and installation site are shown
It is intended to.
A kind of drum-type dustproof blackboard, including soft-type write plate face 7, plank 9, fixed frame 1, transmission mechanism 2, projection dress
Set 8, circuit control device 5, clearing apparatus 3, dust collecting 4, deep clean device 6.It is characterized in that:Transmission mechanism includes
Stepper motor 1, belt 1, big belt pulley 1, small belt pulley 1, driving drum 201, the first bend pulley
202, second bend pulley 203 and third bend pulley 204, the small belt pulley 1 are mounted on stepper motor 1,
The stepper motor 1 is mounted on the upper right side of fixed frame by bolt, and the big belt pulley 1 is mounted on driving and rolls
On cylinder 201,201 both sides of the driving drum and bearing fit and the top mounted on fixed frame 1, the belt 1 around
It is connected on big belt pulley 1 and small belt pulley 1,202 both sides of the first bend pulley and bearing fit are simultaneously mounted on
1 lower section of fixed frame, the second bend pulley 203 and 204 both sides of third bend pulley are pacified with bearing fit and symmetrically respectively
Centre position loaded on fixed frame 1, the fixed frame 1 are bolted on metope；Clearing apparatus 3 includes stepping electricity
Machine 2 302, belt 2 305, big belt pulley 2 306, small belt pulley 2 304, the roller 301 with hairbrush and dust cover one
303, the small belt pulley 2 304 is mounted on stepper motor 2 302, and the stepper motor 2 302 is mounted on anti-by bolt
On dirt shell 1, the big belt pulley 2 306 is mounted on the roller 301 with hairbrush, and the belt 2 305 is wire-wrapped in
On big belt pulley 2 306 and small belt pulley 2 304,301 both sides of roller with hairbrush are with bearing fit and mounted on anti-
On dirt shell 1, the dust cover 1 is mounted on by bolt on fixed frame 1；Dust collecting 4 includes hard
Matter brush stroke 403, dust cover 2 401 and dust collecting box 402, the hard hair brush bar 403 are mounted on dust-proof by bolt
On shell 2 401, the dust cover 2 401 is mounted on the lower section of dust cover 1, the dust collecting box by bolt
402 are placed in the U-type groove of 2 401 lower section of dust cover, and may pass through the hole extraction reserved on fixed frame 1；Deep clean
Device 6 includes supporting rack 608, air blower 601, water tank 603, the roller 609 with sponge, filler pipe 602, outlet pipe 605, water spray
Pipe 607, escape pipe 605, air jet pipe 611, holder 1, holder 2 610, holder 3 612, holder 4 613, the air blower
601 are mounted on 608 top of supporting rack by bolt, and 605 one end of the escape pipe is connected on air blower 601, and the other end passes through
Preformed hole on supporting rack 608 is connected with air jet pipe 611, and the air jet pipe 611 passes through 2 610 quilt of holder 1 and holder
Mounted on 608 lower section of supporting rack, the holder 1 and holder 2 610 are identical, and are symmetrically mounted on supporting rack by bolt
608 both sides, the water tank 603 are mounted on 608 top of supporting rack by bolt, and 602 one end of the filler pipe is mounted on water tank 603
On, the other end is pierced by the preformed hole on fixed frame 1, adds water, 604 one end of the outlet pipe to be connected to water tank for water tank to facilitate
603 lower sections, the other end pass through the preformed hole on supporting rack 608 to be connected with sparge pipe 607, and the sparge pipe 607 passes through holder
3 612 and holder 4 613 be installed on supporting rack 608, the holder 3 612 and holder 4 613 are identical, and pass through bolt pair
Claim to be mounted on 608 both sides of supporting rack, 609 both sides of roller of the band sponge are with bearing fit and on supporting rack 608, institute
Supporting rack 608 is stated to be mounted on fixed frame 1 by bolt.
The plank 9 is mounted on by screw in fixed frame 1, and when writing is used to support soft-type and writes plate face 7, described soft
It is rubber strip that type, which writes plate face 7, and the soft-type writes plate face 7 around being connected in driving drum 201 and the first bend pulley 202, institute
State driving drum 201 drives soft-type to write the rotation of plate face 7, first bend pulley 202, second bend pulley by friction
203 and third bend pulley 204 be responsible for change soft-type write plate face 7 rotation direction.
The roller 301 with hairbrush should write plate face 7 close to the stepper motor 2 302 is logical with soft-type when installing
Crossing belt 2 305, big belt pulley 2 306 and small belt pulley 2 304 drives the roller 301 with hairbrush to rotate, to realize to soft
Type writes the wiping of plate face 7；The hard hair brush bar 403 should be with the roller 301 with hairbrush close to ensure to work as band when installing
When thering is the roller 301 of hairbrush to rotate, the dust that can will be adhered to by hard hair brush bar 403 on the roller 301 with hairbrush
Cleaning is got off；The sparge pipe 607 is hollow pipe, and there are the uniform apopore of a row, when the sparge pipe 607 is installed, is gone out
Plate face 7 is write towards soft-type and writes plate face 7 close to the water tank 603 passes through outlet pipe 604 and sparge pipe with soft-type in water hole
607 pairs of soft-type are write plate face 7 and are humidified；The air jet pipe 611 is hollow pipe, and there are the uniform venthole of a row, described
When air jet pipe 611 is installed, venthole writes plate face 7 towards soft-type and writes plate face 7 close to the air blower 601 is logical with soft-type
Escape pipe 605 and air jet pipe 611 is crossed to dry soft-type writing plate face 7；The roller 609 of the band sponge is that surface is cased with one
The roller of layer sponge should write plate face 7 with soft-type when the roller 609 of the band sponge is installed and be adjacent to, and the soft-type writes plate face 7
When rotation, the roller 609 with sponge is driven to rotate, to ensure to write soft-type the cleaning of plate face 7.
The circuit control device 5 includes shell 501, control panel 502, and the shell 501 is mounted on solid by bolt
Determine the outside of frame 1, the control panel 502 is mounted on by screw in shell 501, and for controlling the action of blackboard and opening
Stop；The projection arrangement 8 is mounted on the top of fixed frame 1, and projecting apparatus is coordinated to work.
Claims (4)
1. a kind of drum-type dustproof blackboard, including soft-type write plate face, plank, fixed frame, transmission mechanism, projection arrangement, electricity
Road control device, clearing apparatus, dust collecting, deep clean device.It is characterized in that:Transmission mechanism includes stepper motor
One, belt one, big belt pulley one, small belt pulley one, driving drum, the first bend pulley, second bend pulley and third changed course
Roller, the small belt pulley one are mounted on stepper motor one, and the stepper motor one is mounted on fixed frame by bolt
Upper right side, the big belt pulley one are mounted in driving drum, and the driving drum both sides are with bearing fit and mounted on fixation
The top of frame, the belt one are wire-wrapped on big belt pulley one and small belt pulley one, first bend pulley both sides and axis
Hold and be mounted below fixed frame with merging, the second bend pulley and third bend pulley both sides respectively with bearing fit simultaneously
It is symmetrically arranged on the centre position of fixed frame, the fixed frame is bolted on metope；Clearing apparatus includes step
Stepper motor two, belt two, big belt pulley two, small belt pulley two, the roller with hairbrush and dust cover one, the small belt pulley
Two are mounted on stepper motor two, and the stepper motor two is mounted on by bolt on dust cover one, the big belt pulley two
On the roller with hairbrush, the belt two is wire-wrapped on big belt pulley two and small belt pulley two, described to carry hairbrush
Roller both sides and bearing fit and on dust cover one, the dust cover one is mounted on fixed frame by bolt
On；Dust collecting includes hard hair brush bar, dust cover two and dust collecting box, and the hard hair brush bar is pacified by bolt
On dust cover two, the dust cover two is mounted on the lower section of dust cover one, the dust collecting box by bolt
It is placed in the U-type groove of two lower section of dust cover, and may pass through the hole extraction reserved on fixed frame；Deep clean device includes
Supporting rack, air blower, water tank, the roller with sponge, filler pipe, outlet pipe, sparge pipe, escape pipe, air jet pipe, holder one, branch
Frame two, holder three, holder four, the air blower are mounted on by bolt above supporting rack, and described escape pipe one end is connected to drum
On wind turbine, the other end passes through the preformed hole on supporting rack to be connected with air jet pipe, and the air jet pipe passes through holder one and holder two
It is installed in below supporting rack, the holder one and holder two are identical, and are symmetrically mounted on supporting rack both sides by bolt, described
Water tank is mounted on by bolt above supporting rack, and described filler pipe one end is mounted on water tank, and the other end is pierced by fixed frame
Preformed hole, add water to facilitate for water tank, described outlet pipe one end is connected to below water tank, and the other end passes through pre- on supporting rack
It boxes out and is connected with sparge pipe, the sparge pipe is installed in by holder three and holder four on supporting rack, three He of the holder
Holder four is identical, and is symmetrically mounted on supporting rack both sides by bolt, and the roller both sides of the band sponge and bearing fit are simultaneously pacified
On supporting rack, support frame as described above is mounted on by bolt on fixed frame.
2. a kind of drum-type dustproof blackboard according to claim 1, it is characterized in that：The plank is mounted on solid by screw
Determine in frame, when writing is used to support soft-type and writes plate face, and it is rubber strip that the soft-type, which writes plate face, and the soft-type writes plate face
Around being connected in driving drum and the first bend pulley, the driving drum drives soft-type to write plate face rotation by friction, described
First bend pulley, second bend pulley and third bend pulley are responsible for changing the rotation direction that soft-type writes plate face.
3. a kind of drum-type dustproof blackboard according to claim 1, it is characterized in that：When the roller with hairbrush is installed
Should be close with soft-type clipboard face paste, the stepper motor two is carried by belt two, big belt pulley two and small belt pulley two
The roller of hairbrush rotates, to realize the wiping for writing plate face to soft-type；When hard hair brush bar installation should with hairbrush
Roller is close to ensure, when the roller with hairbrush rotates, the rolling for carrying hairbrush can will be adhered to by hard hair brush bar
Dust on cylinder is cleared up；The sparge pipe is hollow pipe, and there are the uniform apopore of a row, the sparge pipe installations
When, apopore writes plate face and close with soft-type clipboard face paste towards soft-type, and the water tank is by outlet pipe and sparge pipe to soft
Type is write plate face and is humidified；The air jet pipe is hollow pipe, and there are the uniform venthole of a row, the air jet pipe installations
When, venthole writes plate face and close with soft-type clipboard face paste towards soft-type, and the air blower passes through escape pipe and air jet pipe pair
Soft-type, which writes plate face, is dried；The roller of the band sponge is the roller that surface is cased with one layer of sponge, the rolling of the band sponge
Should be tight with soft-type clipboard face paste when cylinder installation, when the soft-type writes plate face rotation, the roller rotation with sponge is driven, to protect
Demonstrate,prove the cleaning that plate face is write to soft-type.
4. a kind of drum-type dustproof blackboard according to claim 1, it is characterized in that：The circuit control device includes outer
Shell, control panel, the shell are mounted on the outside of fixed frame by bolt, and the control panel is mounted on outer by screw
In shell, and for controlling the action and start and stop of blackboard；The projection arrangement is mounted on the top of fixed frame, and coordinates projecting apparatus
It works.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810512581.5A CN108583083A (en) | 2018-05-25 | 2018-05-25 | A kind of drum-type dustproof blackboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810512581.5A CN108583083A (en) | 2018-05-25 | 2018-05-25 | A kind of drum-type dustproof blackboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108583083A true CN108583083A (en) | 2018-09-28 |
Family
ID=63629155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810512581.5A Pending CN108583083A (en) | 2018-05-25 | 2018-05-25 | A kind of drum-type dustproof blackboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108583083A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110217023A (en) * | 2019-05-15 | 2019-09-10 | 谢陶明 | A kind of avoidable writing blackboard for writing curtain abrasion |
| CN111710260A (en) * | 2020-06-23 | 2020-09-25 | 惠安县华洛广告设计中心 | Spray painting billboard with tensioning and self-cleaning functions |
-
2018
- 2018-05-25 CN CN201810512581.5A patent/CN108583083A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110217023A (en) * | 2019-05-15 | 2019-09-10 | 谢陶明 | A kind of avoidable writing blackboard for writing curtain abrasion |
| CN111710260A (en) * | 2020-06-23 | 2020-09-25 | 惠安县华洛广告设计中心 | Spray painting billboard with tensioning and self-cleaning functions |
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Application publication date: 20180928 |