CN108944195A - A method of improving Classroom air quality - Google Patents
A method of improving Classroom air quality Download PDFInfo
- Publication number
- CN108944195A CN108944195A CN201810672881.XA CN201810672881A CN108944195A CN 108944195 A CN108944195 A CN 108944195A CN 201810672881 A CN201810672881 A CN 201810672881A CN 108944195 A CN108944195 A CN 108944195A
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- blackboard
- dust
- cleaning mechanism
- cabinet
- main body
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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
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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
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Abstract
The present invention relates to technical field of air purification, specifically a kind of method for improving Classroom air quality, this method uses ash-collecting blackboard eraser, which includes installing mechanism, displacement mechanism, blackboard main body, the first cleaning mechanism, switching mechanism, the second cleaning mechanism, dust collection mechanism and the first rotary electric machine；Ash-collecting blackboard eraser is when along installing mechanism mobile box, the runner of linear array setting will drive hairbrush rotation, and so as to scrape to blackboard, and runner is in genesis analysis, longitudinal height of blackboard can be realized and be completely covered, without user again to being handled at the top of blackboard；The chalk dust wiped off will can be collected, in the classroom for avoiding it from drifting, and be interconnected using the top of the circulation passage of trapezium structure and dust-storage chamber, when can be avoided shutdown, chalk dust flows out again by dust collection mechanism；The mark of remaining can be erased by foam-rubber cushion, so that blackboard is more bright.
Description
Technical field
The present invention relates to technical field of air purification, specifically a kind of method for improving Classroom air quality.
Background technique
That the crowd is dense in this way is indoor for classroom or office, and air quality is poor, increases the propagation of indoor influenza virus, no
Conducive to the health of teacher and student.And one of the reason for causing classroom air quality poor, it is caused by using chalk
Dust pollution.
Existing blackboard eraser is the hair rub of cuboid, and a large amount of dust is generated when erasing the board；Teachers are must be a large amount of
It speaks, pollution caused by these dust is enough to keep teacher sick, and serious person can also generate silicosis, seriously damage the body of teacher
Body health；Dust also has an impact to the health of student, although student may be less by dust injury far from blackboard.
In use for some time, surface can remain many chalk dusts to blackboard eraser, so that the effect to erase the board is big
Big decline, service life are limited；When erasing the board, chalk dust can drift air；When being cleared up at the top of to blackboard, than
It is harder, it sometimes need to also be by stool.
Summary of the invention
For the problems of the prior art, the present invention provides a kind of method for improving Classroom air quality, this method makes
With ash-collecting blackboard eraser, when ash-collecting blackboard eraser is along installing mechanism mobile box, the runner of linear array setting will drive hair
Brush rotation, so as to scrape to blackboard, so that the chalk dust on blackboard surface is quickly wiped off, cleaning effect is good, and turns
Wheel is in genesis analysis, can realize and be completely covered to longitudinal height of blackboard, without user again to handling at the top of blackboard；
The chalk dust wiped off will can be collected by dust collection mechanism, in the classroom for avoiding it from drifting, and use trapezium structure
Circulation passage and dust-storage chamber top be interconnected, when can be avoided shutdown, chalk dust flows out again；It can by switching mechanism
The free switching between the first cleaning mechanism, the second cleaning mechanism, thus after the operation of the first cleaning mechanism, then pass through sea
Silk floss pad erases the mark of remaining, so that blackboard is more bright, three faces of support base are equipped with foam-rubber cushion, is used interchangeably,
Extend the service life of the second cleaning mechanism.
The technical solution adopted by the present invention to solve the technical problems is: a method of Classroom air quality is improved, it should
Method the following steps are included:
Step 1: ash-collecting blackboard eraser is used when clearing up blackboard；
Step 2: indoor air humidity is taught using humidifier regulating step one；
Step 3: in the religion indoor location air purifier of step 2；
Step 4: ventilation fan is installed on the classroom wall of step 3；
Wherein, the ash-collecting blackboard eraser includes installing mechanism, displacement mechanism, blackboard main body, the first cleaning mechanism, cuts
It changes planes structure, the second cleaning mechanism, dust collection mechanism and the first rotary electric machine；The installing mechanism is located at the bottom of the blackboard main body
Portion；The installing mechanism is slidably connected institute's displacement mechanism；The inside of institute's displacement mechanism is equipped with first cleaning mechanism
With second cleaning mechanism, first cleaning mechanism, second cleaning mechanism are symmetrically set, first cleaning
Mechanism, second cleaning mechanism are to clear up blackboard；Pass through institute between first cleaning mechanism, second cleaning mechanism
Switching mechanism connection is stated, the switching mechanism is to drive cleaning mechanism to rotate；The inside of institute's displacement mechanism is equipped with described
Dust collection mechanism, the dust collection mechanism is to store chalk dust.
Specifically, the installing mechanism includes that installation guide rail and mounting post, the installation guide rail are set to the blackboard in parallel
The bottom of main body, the length of the installation guide rail are greater than the length of the blackboard main body, and the inner wall both ends of the installation guide rail are hung down
It is directly equipped with the mounting post, the mounting post is located at the two sides of the blackboard main body.
Specifically, institute's displacement mechanism includes slide, cabinet, the first access panel and second access panel, it is described
Slide is rhs-structure, and the slide is socketed on the outside of the installation guide rail, and the top of the slide is vertically equipped with the case
Body, the inner wall of the cabinet and the surface of the blackboard main body are bonded to each other, and the length of the cabinet is greater than the blackboard main body
Width, the cabinet and the side of the blackboard main body be parallel to each other, and the cabinet is the cavity structure of inner layer opening, described
The outer wall hinge of cabinet is connected with first access panel and second access panel.
Specifically, the switching mechanism includes rotating plate and the second rotary electric machine, second rotary electric machine and the cabinet
Inside top surface midline be vertically fixedly connected, second rotary electric machine is rotatablely connected the rotating plate, the rotating plate with it is described
It is mutually perpendicular to be distributed between second rotary electric machine.
Specifically, first cleaning mechanism includes runner, driving belt, hairbrush, rotary column and fixed plate, the fixation
Plate is vertical at one end of the rotating plate, and the linear array of the side wall of the fixed plate, which is equally spaced, the runner, and described turn
The hairbrush is distributed in the bottom surface of wheel, and the top of the fixed plate is fixed with the rotary column, and the bottom end of the fixed plate is fixed with
First rotary electric machine, the rotary column, first rotary electric machine outer wall be wound with the driving belt, the transmission
Belt sequentially passes through each runner.
Specifically, second cleaning mechanism includes support rod, support base and foam-rubber cushion, the support rod is vertical at
The other end of the rotating plate, the support rod are fixed on the top of the support base, and the section of the support base is equilateral triangle
Each side of shape, the support base has been connected by screw to the foam-rubber cushion.
Specifically, the dust collection mechanism includes box body, into dirt channel, circulation passage, dust-storage chamber, mesh partition and dust suction
Fan, the box body are set to the inside of the cabinet, the outer wall of the box body be provided with it is described into dirt channel, it is described to be connected into dirt channel
There is the circulation passage, the circulation passage and the top of the dust-storage chamber are interconnected, and the inside of the dust-storage chamber is equipped with institute
Mesh partition is stated, the side of the mesh partition is equipped with the dust-absorbing fan, and the dust-absorbing fan is from top to bottom equipped with several, described
Lateral section into dirt channel is in splayed configuration, and the section of the circulation passage is in a rectangular trapezoid.
Beneficial effects of the present invention:
(1) a kind of method for improving Classroom air quality of the present invention, this method use ash-collecting blackboard eraser, dust suction
For formula blackboard eraser when along installing mechanism mobile box, the runner of linear array setting will drive hairbrush rotation, so as to black
Plate is scraped, so that the chalk dust on blackboard surface is quickly wiped off, cleaning effect is good, and runner is in genesis analysis, can
Longitudinal height of blackboard is realized and is completely covered, without user again to being handled at the top of blackboard.
(2) a kind of method for improving Classroom air quality of the present invention, this method use ash-collecting blackboard eraser, the suction
Dirt formula blackboard eraser can will be collected the chalk dust wiped off by dust collection mechanism, in the classroom for avoiding it from drifting, and adopt
It is interconnected with the circulation passage of trapezium structure and the top of dust-storage chamber, when can be avoided shutdown, chalk dust flows out again.
(3) a kind of method for improving Classroom air quality of the present invention, this method use ash-collecting blackboard eraser, the suction
Dirt formula blackboard eraser by switching mechanism can between the first cleaning mechanism, the second cleaning mechanism free switching, thus first
After cleaning mechanism operates, then by foam-rubber cushion remaining mark is erased, so that blackboard is more bright, three of support base
Face is equipped with foam-rubber cushion, is used interchangeably, and extends the service life of the second cleaning mechanism.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is a kind of structural schematic diagram of preferred embodiment of ash-collecting blackboard eraser provided by the invention；
Fig. 2 is box inner structure schematic diagram shown in FIG. 1；
Fig. 3 is the first cleaning mechanism shown in Fig. 2, switching mechanism and dust collection mechanism structural schematic diagram；
Fig. 4 is the second cleaning mechanism structural schematic diagram shown in Fig. 2.
In figure: 1, installing mechanism, 11, installation guide rail, 12, mounting post, 2, displacement mechanism, 21, slide, 22, cabinet, 23,
First access panel, the 24, second access panel, 3, blackboard main body, the 4, first cleaning mechanism, 41, runner, 42, driving belt,
43, hairbrush, 44, rotary column, 45, fixed plate, the 46, first rotary electric machine, 5, switching mechanism, 51, rotating plate, the 52, second rotary electric machine,
6, the second cleaning mechanism, 61, support rod, 62, support base, 63, foam-rubber cushion, 7, dust collection mechanism, 71, box body, 72, into dirt channel,
73, circulation passage, 74, dust-storage chamber, 75, mesh partition, 76, dust-absorbing fan.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific embodiment is closed, the present invention is further explained.
As Figure 1-Figure 4, a kind of method improving Classroom air quality of the present invention, this method includes following step
It is rapid:
Step 1: ash-collecting blackboard eraser is used when clearing up blackboard；
Step 2: indoor air humidity is taught using humidifier regulating step one；
Step 3: in the religion indoor location air purifier of step 2；
Step 4: ventilation fan is installed on the classroom wall of step 3；
Wherein, the ash-collecting blackboard eraser includes installing mechanism 1, displacement mechanism 2, blackboard main body 3, the first cleaning mechanism
4, switching mechanism 5, the second cleaning mechanism 6 and dust collection mechanism 7；The installing mechanism 1 is located at the bottom of the blackboard main body 3；
The installing mechanism 1 is slidably connected institute's displacement mechanism 2；The inside of institute's displacement mechanism 2 is equipped with first cleaning mechanism 4
With second cleaning mechanism 6, first cleaning mechanism 4, second cleaning mechanism 6 are symmetrically set, and described first
Cleaning mechanism 4, second cleaning mechanism 6 are to clear up blackboard；First cleaning mechanism 4, second cleaning mechanism 6 it
Between connected by the switching mechanism 5, the switching mechanism 5 is to drive cleaning mechanism to rotate；The inside of institute's displacement mechanism 2
The dust collection mechanism 7 is installed, the dust collection mechanism 7 is to store chalk dust.
Specifically, as shown in Figure 1, the installing mechanism 1 includes installation guide rail 11 and mounting post 12, the installation guide rail 11
It is set to the bottom of the blackboard main body 3 in parallel, the length of the installation guide rail 11 is greater than the length of the blackboard main body 3, described
The inner wall both ends of installation guide rail 11 are vertically equipped with the mounting post 12, and the mounting post 12 is located at the two sides of the blackboard main body 3；
In order to realize reciprocal cleaning.
Specifically, as shown in Figure 1, institute's displacement mechanism 2 includes slide 21, cabinet 22, the first access panel 23 and described
Second access panel 24, the slide 21 are rhs-structure, and the slide 21 is socketed on the outside of the installation guide rail 11, described
The top of slide 21 is vertically equipped with the cabinet 22, and the inner wall of the cabinet 22 and the surface of the blackboard main body 3 are bonded to each other,
The length of the cabinet 22 is greater than the width of the blackboard main body 3, and the cabinet 22 and the side of the blackboard main body 3 are mutually flat
Row, the cabinet 22 are the cavity structure of inner layer opening, and the outer wall hinge of the cabinet 22 is connected with first access panel
23 and second access panel 24；It is longitudinally covered in order to be carried out to blackboard, improve cleaning speed.
Specifically, as shown in figure 3, the switching mechanism 5 includes rotating plate 51 and the second rotary electric machine 52, second rotation
Motor 52 is vertical with the inside top surface midline of the cabinet 22 to be fixedly connected, and second rotary electric machine 52 is rotatablely connected described
Rotating plate 51 is mutually perpendicular to be distributed between the rotating plate 51 and second rotary electric machine 52；In order between two cleaning mechanisms
Free switching.
Specifically, as shown in figure 3, first cleaning mechanism 4 includes runner 41, driving belt 42, hairbrush 43, rotary column
44, fixed plate 45 and the first rotary electric machine 46, the fixed plate 45 are vertical at one end of the rotating plate 51, the fixed plate
The linear array of 45 side wall, which is equally spaced, the runner 41, and the hairbrush 43 is distributed in the bottom surface of the runner 41, described
The top of fixed plate 45 is fixed with the rotary column 44, and the bottom end of the fixed plate 45 is fixed with first rotary electric machine 46, institute
State rotary column 44, the outer wall of first rotary electric machine 46 is wound with the driving belt 42, the driving belt 42 is successively worn
Cross each runner 41；In order to which chalk dust is brushed away so that cleaning effect is more preferable, speed faster.
Specifically, as shown in Figure 2 and Figure 4, second cleaning mechanism 6 includes support rod 61, support base 62 and sponge
Pad 63, the support rod 61 are vertical at the other end of the rotating plate 51, and the support rod 61 is fixed on the support base 62
The section on top, the support base 62 is equilateral triangle, and each side of the support base 62 is connected by screw to
State foam-rubber cushion 63；In order to clear up mark, more blackboard is more bright.
Specifically, as shown in Figures 2 and 3, the dust collection mechanism 7 include box body 71, into dirt channel 72, circulation passage 73,
Dust-storage chamber 74, mesh partition 75 and dust-absorbing fan 76, the box body 71 is outside the inside of the cabinet 22, the box body 71
Wall be provided with it is described into dirt channel 72, it is described to be communicated with the circulation passage 73 into dirt channel 72, the circulation passage 73 with it is described
The top of dust-storage chamber 74 is interconnected, and the inside of the dust-storage chamber 74 is equipped with the mesh partition 75, the mesh partition 75
Side is equipped with the dust-absorbing fan 76, and the dust-absorbing fan 76 is from top to bottom equipped with several, and the lateral section into dirt channel 72 is in
The section of splayed configuration, the circulation passage 73 is in a rectangular trapezoid；In order to quickly be collected to the chalk dust under cleaning.
When along 1 mobile box 22 of installing mechanism, the runner 41 of linear array setting will drive the rotation of hairbrush 43, thus
Blackboard can be scraped, so that the chalk dust on blackboard surface is quickly wiped off, cleaning effect is good, and runner 41 is in longitudinal point
Cloth can realize longitudinal height of blackboard and be completely covered, without user again to handling at the top of blackboard；Pass through vacuum cleaner
Structure 7 can will be collected the chalk dust wiped off, in the classroom for avoiding it from drifting, and using the circulation passage of trapezium structure
73 is interconnected with the top of dust-storage chamber 74, and when can be avoided shutdown, chalk dust flows out again；It can be by switching mechanism 5
Free switching between one cleaning mechanism 4, the second cleaning mechanism 5, thus after the operation of the first cleaning mechanism 4, then pass through sea
Continuous pad 63 erases the mark of remaining, so that blackboard is more bright, three faces of support base 62 are equipped with foam-rubber cushion 62, can replace
It uses, extends the service life of the second cleaning mechanism 6.Specifically have:
(1) first two mounting posts 12 are fixed on the wall by expansion bolt, installation guide rail 11 is fixed, so that
Guide rail 11 is located at the bottom of blackboard, cabinet 22 can be bonded with blackboard for installation；
(2), can be along the installation slowly moving slide 21 of guide rail 11 when needing to erase the board, cabinet 11 will be in blackboard table
Face movement, the first rotary electric machine 46 of starting drive each runner 41 to rotate by driving belt 42, and runner 41 is transported with electric brush 43
It is dynamic, the chalk on blackboard can be printed and be wiped off, realization quickly cleans, and the chalk dust being scraped can be under the action of dust-absorbing fan 76
Enter from into dirt channel 72, is then moved upwards further along circulation passage 73, finally fall and stored up from the top of dust-storage chamber 74
It deposits, realization is collected while clearing up, and in the classroom that will not be drifted, and the first cleaning mechanism 4 of linear array distribution can
Blackboard is carried out longitudinally covered；After moving back and forth twice along installation guide rail 11, the preliminary treatment of chalk dust can be completed；
(3) the second rotary electric machine 52 can be started and drive the first cleaning mechanism 4, the rotation of the second cleaning mechanism 6, so that second is clear
Reason mechanism 6 is bonded to each other with blackboard, and user can be again along installation 11 mobile box 22 of guide rail, and foam-rubber cushion 63 can be to blackboard
It is wiped, completes last cleaning；
(4) openable second access panel 24 will be stored in chalk dust in dust-storage chamber 74 and clean up, also openable first inspection
It builds plate 23 to safeguard the first cleaning mechanism 4, the second cleaning mechanism 5, foam-rubber cushion 63 be cleared up, also replaceable support
The working face of seat 62.
For the present invention when along 1 mobile box 22 of installing mechanism, the runner 41 of linear array setting will drive 43 turns of hairbrush
Dynamic, so as to scrape to blackboard, so that the chalk dust on blackboard surface is quickly wiped off, cleaning effect is good, and runner 41
In genesis analysis, longitudinal height of blackboard can be realized and be completely covered, without user again to being handled at the top of blackboard；It is logical
The chalk dust wiped off can will be collected by crossing dust collection mechanism 7, in the classroom for avoiding it from drifting, and using trapezium structure
The top of circulation passage 73 and dust-storage chamber 74 is interconnected, and when can be avoided shutdown, chalk dust flows out again；Pass through switching mechanism 5
Can between the first cleaning mechanism 4, the second cleaning mechanism 5 free switching, thus the first cleaning mechanism 4 operation after,
The mark of remaining is erased by foam-rubber cushion 63 again, so that blackboard is more bright, three faces of support base 62 are equipped with foam-rubber cushion
62, it is used interchangeably, extends the service life of the second cleaning mechanism 6.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the description in above embodiment and specification only illustrates the present invention
Principle, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these variation and
Improvement is both fallen in the scope of protection of present invention.The claimed scope of the invention is by appended claims and its equivalent
Object defines.
Claims (7)
1. a kind of method for improving Classroom air quality, which is characterized in that method includes the following steps:
Step 1: ash-collecting blackboard eraser is used when clearing up blackboard；
Step 2: indoor air humidity is taught using humidifier regulating step one；
Step 3: in the religion indoor location air purifier of step 2；
Step 4: ventilation fan is installed on the classroom wall of step 3；
Wherein, the ash-collecting blackboard eraser includes installing mechanism (1), displacement mechanism (2), blackboard main body (3), the first descaling machine
Structure (4), switching mechanism (5), the second cleaning mechanism (6) and dust collection mechanism (7)；The installing mechanism (1) is located at the blackboard
The bottom of main body (3)；The installing mechanism (1) is slidably connected institute's displacement mechanism (2)；Pacify the inside of institute's displacement mechanism (2)
Equipped with first cleaning mechanism (4) and second cleaning mechanism (6), first cleaning mechanism (4), second cleaning
Mechanism (6) is symmetrically set, and first cleaning mechanism (4), second cleaning mechanism (6) are to clear up blackboard；It is described
It is connected between first cleaning mechanism (4), second cleaning mechanism (6) by the switching mechanism (5), the switching mechanism
(5) to drive cleaning mechanism to rotate；The inside of institute's displacement mechanism (2) is equipped with the dust collection mechanism (7), the vacuum cleaner
Structure (7) is to store chalk dust.
2. a kind of method for improving Classroom air quality according to claim 1, it is characterised in that: the installing mechanism
It (1) include installation guide rail (11) and mounting post (12), installation guide rail (11) is set to the bottom of the blackboard main body (3) in parallel
Portion, the length of installation guide rail (11) are greater than the length of the blackboard main body (3), the inner wall both ends of installation guide rail (11)
The mounting post (12) vertically are equipped with, the mounting post (12) is located at the two sides of the blackboard main body (3).
3. a kind of method for improving Classroom air quality according to claim 2, it is characterised in that: institute's displacement mechanism
It (2) include slide (21), cabinet (22), the first access panel (23) and second access panel (24), the slide (21)
For rhs-structure, the slide (21) is socketed on the outside of installation guide rail (11), and the top of the slide (21) is vertically set
Have the cabinet (22), the inner wall of the cabinet (22) and the surface of the blackboard main body (3) are bonded to each other, the cabinet (22)
Length be greater than the width of the blackboard main body (3), the side of the cabinet (22) and the blackboard main body (3) is parallel to each other,
The cabinet (22) is the cavity structure of inner layer opening, and the outer wall hinge of the cabinet (22) is connected with first access panel
(23) and second access panel (24).
4. a kind of method for improving Classroom air quality according to claim 3, it is characterised in that: the switching mechanism
It (5) include rotating plate (51) and the second rotary electric machine (52), the inside top of second rotary electric machine (52) and the cabinet (22)
Face midline is vertically fixedly connected, and second rotary electric machine (52) is rotatablely connected the rotating plate (51), the rotating plate (51) with
It is mutually perpendicular to be distributed between second rotary electric machine (52).
5. a kind of method for improving Classroom air quality according to claim 5, it is characterised in that: first descaling machine
Structure (4) includes runner (41), driving belt (42), hairbrush (43), rotary column (44), fixed plate (45) and the first rotary electric machine
(46), the fixed plate (45) is vertical at one end of the rotating plate (51), the linear array of side wall of the fixed plate (45)
Being equally spaced has the runner (41), and the bottom surface of the runner (41) is distributed with the hairbrush (43), the fixed plate (45)
Top is fixed with the rotary column (44), and the bottom end of the fixed plate (45) is fixed with first rotary electric machine (46), and described turn
Column (44), first rotary electric machine (46) outer wall be wound with the driving belt (42), the driving belt (42) according to
It is secondary to pass through each runner (41).
6. a kind of method for improving Classroom air quality according to claim 5, it is characterised in that: second descaling machine
Structure (6) includes support rod (61), support base (62) and foam-rubber cushion (63), and the support rod (61) is vertical at the rotating plate
(51) the other end, the support rod (61) are fixed on the top of the support base (62), and the section of the support base (62) is
Each side of equilateral triangle, the support base (62) has been connected by screw to the foam-rubber cushion (63).
7. a kind of method for improving Classroom air quality according to claim 3, it is characterised in that: the dust collection mechanism
It (7) include box body (71), into dirt channel (72), circulation passage (73), dust-storage chamber (74), mesh partition (75) and dust-absorbing fan
(76), the box body (71) is set to the inside of the cabinet (22), and the outer wall of the box body (71) is provided with described into dirt channel
(72), described to be communicated with the circulation passage (73) into dirt channel (72), the circulation passage (73) and the dust-storage chamber (74)
Top be interconnected, the inside of the dust-storage chamber (74) is equipped with the mesh partition (75), the one of the mesh partition (75)
Side is equipped with the dust-absorbing fan (76), and the dust-absorbing fan (76) is from top to bottom equipped with several, and the side into dirt channel (72) is cut
Face is in splayed configuration, and the section of the circulation passage (73) is in a rectangular trapezoid.
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| CN201810672881.XA CN108944195B (en) | 2018-06-26 | 2018-06-26 | Method for improving classroom air quality |
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|---|---|---|---|
| CN201810672881.XA CN108944195B (en) | 2018-06-26 | 2018-06-26 | Method for improving classroom air quality |
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| CN108944195B CN108944195B (en) | 2020-09-01 |
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| CN205498440U (en) * | 2016-01-29 | 2016-08-24 | 吕浩然 | Automatic clearance blackboard device |
| CN107972386A (en) * | 2017-11-22 | 2018-05-01 | 江林伟 | Multi-functional blackboard equipped with side dust-collecting mechanism |
| CN108162647A (en) * | 2018-01-08 | 2018-06-15 | 四川省达县职业高级中学 | Automatic erasing blackboard machine |
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