CN104191878B - The semi-automatic dust absorption blackboard eraser of a kind of solar energy - Google Patents
The semi-automatic dust absorption blackboard eraser of a kind of solar energy Download PDFInfo
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- CN104191878B CN104191878B CN201410445340.5A CN201410445340A CN104191878B CN 104191878 B CN104191878 B CN 104191878B CN 201410445340 A CN201410445340 A CN 201410445340A CN 104191878 B CN104191878 B CN 104191878B
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- blackboard eraser
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Abstract
The semi-automatic dust absorption blackboard eraser of a kind of solar energy, belongs to teaching aid technical field.To solve in prior art without the blackboard eraser problem that automatic dust removing and dust suction are combined as a whole.Solar photovoltaic cell panel is connected with controller, and controller is connected by power transmission line with quick charge socket, and battery to be arranged in blackboard eraser shell and to be connected with quick charge socket, and battery is connected with motor; Motor is connected with gear transmission speed reducing mechanism by shaft coupling, two driven gear wheel shafts of gear transmission speed reducing mechanism are respectively fixed with one group of fan blade, the axle outer end of driven gear is fixed with wiping dish, and the opening end that wiping dish is arranged on blackboard eraser shell is outside, and the card of wiping dish is provided with aperture; Be provided with drawing and pulling type dust box between the wheel shaft of two driven gears of gear transmission speed reducing mechanism, the wheel shaft upper ring cap of driven gear is equipped with sleeve pipe, and sleeve pipe is fixed on the filter dirt screen net component that is obliquely installed.The present invention is used in teaching, has dust automatically except inhaling function.
Description
Technical field
The present invention relates to a kind of blackboard eraser, belong to teaching aid technical field.
Background technology
" chalk, three chi dais ", this is the sincere praise to teacher.Hardly realize, behind, secret worry the more in praise." chalk syndrome " that writing on the blackboard brings has become the No.1 healthy hidden danger of numerous teachers and students.Teacher uses chalk-writing writing on the blackboard throughout the year, and carries out wiping with traditional blackboard eraser, will bring following drawback like this:
1, in blackboard wiping process, Faculty and Students independently " suction " can not enter a large amount of dust in body, easily suffer from respiratory disease.And student and chalk dust long for time of contact, be subject to the harm of classroom reentrainment of dust, the harm that they are subject to is even even more serious than teacher.Student from little acquire to finish college at least needed for 16 years, the gold period that this grows just, but constantly to be subject to the invasion and attack of chalk dust; Most at about 40 years to retirement on teacher's slave station to dais, more than half time of life all " will eat chalk dust ".Will write writing on the blackboard, blackboard wiping because attend class every day, chalk dust often makes with dishevelled hair and a dirty face teacher.
2, in teaching, teacher often understands limit and writes writing on the blackboard, while explain, explanation and blackboard wiping carry out simultaneously even sometimes, and chalk dust is also just naturally inhaled in body.When giving lessons if catch a cold teacher, under the patient's condition such as cough, chalk dust makes the matter worse especially, also can bring out asthma disease time serious.Generally speaking, a middle school Chinese language teacher, on the joint class of 45 minutes, needs the writing on the blackboard of writing at least one blackboard surface, and needs half chalk of using up; And a Middle School English teacher or math teacher are on the joint class of 45 minutes, need the writing on the blackboard of writing five blackboard surfaces, and need to use up two and half chalk.And the teacher of graduating class needs at most 6 class for one day, be just equivalent to " to inhale " 12 chalks in body, have a strong impact on the healthy of teacher.
3, teacher is in teaching, should explain lecture contents, and also often want continuous blackboard wiping, a class gets off, and teacher often can feel exhausted, and adds the teaching load of teacher.
For the problems referred to above, people improve traditional blackboard eraser, as Authorization Notice No. be CN203592839U, authorized announcement date is the utility model patent that 2014 05 month 14 day, are called " touch-control automatic dust absorption multifunctional blackboard eraser ", this patent can only realize the automatic dust-collection function of dust, but cannot realize the function of Automatic erasing blackboard.In addition, though existing automatic blackboard eraser in existing market, great majority all for one piece of blackboard design, and use inconvenience, really do not reach automatically and the dustless object being incorporated into one, but also consume conventional electric energy.
In sum, vast educator thirsts for there is a kind of novel time saving and energy saving free of contamination blackboard eraser again appearance early very much.
Summary of the invention
The object of the present invention is to provide the semi-automatic dust absorption blackboard eraser of a kind of solar energy, to solve the problem of the blackboard eraser be combined as a whole without automatic dust removing and dust suction in prior art.
Realize above-mentioned purpose, the technical scheme taked is as follows: the semi-automatic dust absorption blackboard eraser of a kind of solar energy, comprise solar photovoltaic cell panel and blackboard eraser shell, the semi-automatic dust absorption blackboard eraser of described solar energy also comprises controller, gauge tap, quick charge socket, multiple battery, multiple wiping dish, organize fan blade more, multiple drawing and pulling type dust box, multiple gear transmission speed reducing mechanism, multiple motor, multiple shaft coupling, multiple dust shield, multiple filter dirt screen net component and multiple sleeve pipe, one end of blackboard eraser shell is provided with uncovered, solar photovoltaic cell panel is connected with controller, controller is connected by power transmission line with quick charge socket, multiple battery to be arranged in blackboard eraser shell and to be connected with quick charge socket, multiple battery is connected one by one with the multiple motors be arranged in blackboard eraser shell, blackboard eraser side wall of outer shell is fixed with the gauge tap simultaneously opened and closed for controlling multiple motor, the motor shaft of each motor is connected with the input of gear transmission speed reducing mechanism by shaft coupling, the wheel shaft of two driven gears of each gear transmission speed reducing mechanism is respectively fixed with one group of fan blade, the equal level of axle outer end of two driven gears of each gear transmission speed reducing mechanism is fixed with wiping dish, the wheel shaft of each driven gear is together arranged in dust shield together with fixed thereon one group of fan blade, the opening end that multiple wiping dish is all arranged on blackboard eraser shell is outside, and the card of wiping dish is provided with several aperture communicated with dust shield, dust shield is fixed in blackboard eraser shell, the drawing and pulling type dust box be slidably connected with blackboard eraser shell is horizontally disposed with between the wheel shaft of two driven gears of each gear transmission speed reducing mechanism, blackboard eraser side wall of outer shell is provided with drawing and pulling type dust box outlet port with each drawing and pulling type dust box outer end opposite position, the wheel shaft upper ring cap of each described driven gear is equipped with sleeve pipe, sleeve pipe is fixed on filter dirt screen net component, filter dirt screen net component is arranged in dust shield, described filter dirt screen net component comprises multilayer filter dirt gauze, driving gear lopsidedness from filter dirt screen net component one end adjacent with drawing and pulling type dust box to gear transmission speed reducing mechanism and between drawing and pulling type dust box and driven gear.
The present invention has following beneficial effect:
1, the present invention utilizes solar panel as the energy for motor provides power (solar energy replacement electric energy), and when solar energy abundance, without the need to consuming conventional energy resource, not only environmental protection, also reduces cost simultaneously.
2, automatic dust removing and dust suction are combined as a whole by the present invention, alleviate the physical demands of teacher, time saving and energy saving pollution-free again.Blackboard eraser of the present invention can arbitrarily movement, not only erasable one piece of blackboard, simultaneously all right wiping polylith blackboard.
3, in the insufficient situation of solar energy such as overcast and rainy, utilize city's electronic compensating to make up the deficiency of solar energy, ensure that the normal use of blackboard eraser.
To sum up, it is simple, compact that the present invention has overall structure, and cost is low, no dust pollution, do not consume or consume less the feature of conventional energy resource, thus reach the object making numerous teachers and students reduce labour intensity and do not obtain by dust harzard, physical and mental health protecting.
Accompanying drawing explanation
Fig. 1 is the general structure schematic diagram of the semi-automatic dust absorption blackboard eraser of solar energy of the present invention;
Fig. 2 is the structural representation after the semi-automatic dust absorption blackboard eraser of solar energy of the present invention removes solar photovoltaic cell panel and controller;
Fig. 3 is the structural representation of wiping dish;
Fig. 4 is the structural representation of multilayer filter dirt gauze;
Fig. 5 is the structural representation that drawing and pulling type dust box is in pull state;
Fig. 6 is the A partial enlarged drawing of Fig. 5.
Component names shown in figure and label as follows:
Solar photovoltaic cell panel 1, fan blade 2, quick charge socket 3, gear transmission speed reducing mechanism 4, driven gear 4-1, driving gear 4-2, convex shoulder 4-3, battery 5, controller 6, motor 7, gauge tap 8, filter dirt screen net component 9, sleeve pipe 10, shaft coupling 11, dust shield 12, enlarging 12-1, power transmission line 13, pulley 14, city's electronic compensating 15, blackboard eraser shell 16, slideway 16-1, wiping dish 17, aperture 17-1, hairbrush 17-2, soft silk floss wipe 17-3, drawing and pulling type dust box 18.
Detailed description of the invention
Detailed description of the invention one: as shown in Fig. 1 ~ Fig. 6, the semi-automatic dust absorption blackboard eraser of a kind of solar energy, comprise solar photovoltaic cell panel 1 and blackboard eraser shell 16, the semi-automatic dust absorption blackboard eraser of described solar energy also comprises controller 6, gauge tap 8, quick charge socket 3, multiple battery 5, multiple wiping dish 17, many groups fan blade 2 (is driven by motor 7, produce the aspiration of negative pressure), multiple drawing and pulling type dust box 18, multiple gear transmission speed reducing mechanism 4, multiple motor 7, multiple shaft coupling 11, multiple dust shield 12, multiple filter dirt screen net component 9 and multiple sleeve pipe 10, one end of blackboard eraser shell 16 is provided with uncovered, solar photovoltaic cell panel 1 is connected with controller 6, controller 6 is connected by power transmission line 13 with quick charge socket 3, multiple battery 5 to be arranged in blackboard eraser shell 16 and to be connected with quick charge socket 3, controller 6 not only can realize the overcharge of battery 5, over etc., the service life of battery 5 can also be extended.Multiple battery 5 is connected one by one with the multiple motors 7 be arranged in blackboard eraser shell 16, and battery 5 provides electric energy for the motor 7 be arranged in blackboard eraser shell 16.Blackboard eraser shell 16 sidewall is fixed with the gauge tap 8 simultaneously opened and closed for controlling multiple motor 7, the motor shaft of each motor 7 is connected by the input of shaft coupling 11 with gear transmission speed reducing mechanism 4, the wheel shaft of two driven gear 4-1 of each gear transmission speed reducing mechanism 4 is respectively fixed with one group of fan blade 2, the equal level of axle outer end of two driven gear 4-1 of each gear transmission speed reducing mechanism 4 is fixed with the wiping dish 17 for blackboard wiping, the wheel shaft of each driven gear 4-1 is together arranged in dust shield 12 together with fixed thereon one group of fan blade 2, the opening end that multiple wiping dish 17 is all arranged on blackboard eraser shell 16 is outside, the card of wiping dish 17 is provided with several aperture 17-1 communicated with dust shield, dust shield 12 is fixed in blackboard eraser shell 16, thus reaches rapidly and efficiently dust suction object.A drawing and pulling type dust box 18 be slidably connected with blackboard eraser shell 16 is horizontally disposed with between the wheel shaft of two driven gear 4-1 of each gear transmission speed reducing mechanism 4, blackboard eraser shell 16 sidewall is provided with drawing and pulling type dust box outlet port with each drawing and pulling type dust box 18 outer end opposite position, the wheel shaft upper ring cap of each described driven gear 4-1 is equipped with sleeve pipe 10, sleeve pipe 10 is fixed on filter dirt screen net component 9, filter dirt screen net component 9 is arranged in dust shield 12, described filter dirt screen net component 9 comprises multilayer filter dirt gauze, filter the driving gear 4-2 lopsidedness of dirt screen net component 9 one end adjacent with drawing and pulling type dust box 18 to gear transmission speed reducing mechanism 4, filter dirt screen net component 9 one end adjacent with drawing and pulling type dust box 18 between drawing and pulling type dust box 18 and driven gear 4-1.
During use, solar photovoltaic cell panel 1 is arranged on the exterior wall of classroom south orientation.
As shown in Figure 1, Figure 2 and shown in Fig. 5, blackboard eraser shell 16 profile is rectangular shape, the arrangement in matrix form of multiple wiping dish 17.The quantity of wiping dish 17 is determined according to the size of blackboard eraser shell 16 opening end.
As shown in Figure 1 and Figure 2, in order to reach better pick-up performance, the import of dust shield 12 is the enlarging 12-1 of flaring outward.
As shown in Figure 1 and Figure 2, described each gear transmission speed reducing mechanism 4 includes driving gear 4-2 and two driven gear 4-1, the wheel shaft input of driving gear 4-2 is connected by the motor shaft of shaft coupling 11 with motor 7, driving gear 4-2 engages with two driven gear 4-1, and two driven gear 4-1 are symmetricly set on the both sides of driving gear 4-2.
Further: as shown in Figure 1 and Figure 2, be stabilized on the wheel shaft of driven gear 4-1 to make fan blade 2, the wheel shaft of described driven gear 4-1 is provided with a convex shoulder 4-3, and one group of described fan blade 2 is fixed on convex shoulder 4-3 along the circumferencial direction of convex shoulder 4-3 is uniform.
Preferably: one group of described fan blade 2 comprises three fan blades, 2, three fan blades 2 and is welded on convex shoulder 4-3 along the circumferencial direction of convex shoulder is uniform.Not only simplify the structure of blackboard eraser, also eliminate the expense of equipped blower fan separately simultaneously.
Preferably: as shown in Figure 1, described controller 6 is provided with the connectivity port for being connected with quick charge socket 3, and the connectivity port of controller 6 is connected by described power transmission line 13 with quick charge socket 3.
Detailed description of the invention two: as shown in Figure 1, Figure 3, the semi-automatic dust absorption blackboard eraser of a kind of solar energy described in detailed description of the invention one, the card of described wiping dish 17 is circular, gather and fixedly penetrated hairbrush 17-2 in the neighboring of the outer card of wiping dish 17, hairbrush 17-2 can breathe freely, and can block certain dust again.The middle part of the outer card of the wiping dish 17 soft silk floss be provided with for blackboard wiping is wiped 17-3, the aperture 17-1 that described several and dust shield 12 communicates and is arranged on the hairbrush 17-2 of wiping dish 17 and soft silk floss is wiped between 17-3.The diameter of aperture 17-1 is 1mm.
Detailed description of the invention three: as shown in Figure 5, the semi-automatic dust absorption blackboard eraser of a kind of solar energy described in detailed description of the invention one, be fixed with many slideway 16-1 along described drawing and pulling type dust box 18 pull direction in described blackboard eraser shell 16, drawing and pulling type dust box 18 is slidably connected with slideway 16-1 by the pulley 14 be arranged on bottom it.
Detailed description of the invention four: as shown in Figure 1, the semi-automatic dust absorption blackboard eraser of a kind of solar energy described in detailed description of the invention one, for avoiding the deficiency of overcast and rainy solar energy to arrange city's electronic compensating, namely described controller 6 is also connected with city's electronic compensating 15.
In order to alleviate wiping blackboard structure weight of the present invention, but do not lose its robustness, application project plastics generally.Its size shape and weight can make people's one hand hold, and are convenient for people to wiping.The wheel shaft (high speed shaft) of driving gear 4-2, the wheel shaft (slow-speed shaft) of driven gear 4-1, blackboard eraser shell 16 all adopt makrolon material to make, and this material has high impact flexibility and excellent dimensional stability.Driven gear 4-1 (low-speed gear) adopts nylon 6 material to make, and this material has excellent mechanical strength and wearability.Shaft coupling 11 adopts glass fiber material to make.Fan blade 2 adopts nylon 6 material to make, and wiping dish 17 selects makrolon material to make, and wipes 17-3 above with hairbrush 17-2 and soft silk floss, because blackboard eraser inconvenience of the present invention often adds lubricant, so adopt the lubrication form of grease lubrication.
The battery adopted in the present invention, controller, motor are market purchasing part, wherein:
Motor is preferred: model is 310T-11400; Rated motor voltage is 4V-5.9V; Motor diameter is 24.2mm; High 18.2mm; Motor shaft diameter is 2mm; Motor axial length is 8mm.
Battery is preferred: model is SE189A; Voltage is 4V; Type is fixed battery; Chemical type is lead-acid accumulator; Appearance and size is 35 × 22 × 65mm; Rated capacity is 700mAh.
Controller is preferred: model is JWL-TB-10A/12V; Material is aluminium alloy.
The battery adopted in the present invention, controller and motor are not limited to above-mentioned disclosed model, as long as can realize object of the present invention and reach all can adopting of technique effect of the present invention.
The course of work:
Open gauge tap 8, circuit ON, motor 7 rotates, motor 7 drives the wheel shaft of driving gear 4-2 to rotate by motor shaft, driving gear 4-2 drives driven gear 4-1 to rotate by Principles of Gear Connection, thus the wheel shaft of driven gear 4-1 is rotated, the wheel shaft of each driven gear 4-1 drives a wiping dish 17 to rotate, and reaches the object erased the board clearly; Meanwhile, because fan blade 2 rotates together with hairbrush 17-2, produce negative pressure and reach pick-up performance, indrawn dust and air mixture, under multilayer filter dirt gauze place dust is detained, and air can filter the discharge of dirt gauze through multilayer, because multilayer filter dirt gauze is obliquely installed, by the dust be detained, and then enter in drawing and pulling type dust box 18 by Action of Gravity Field, extract drawing and pulling type dust box 18 after centralized collection out and topple over dust.
Claims (8)
1. the semi-automatic dust absorption blackboard eraser of solar energy, comprise solar photovoltaic cell panel (1) and blackboard eraser shell (16), it is characterized in that: the semi-automatic dust absorption blackboard eraser of described solar energy also comprises controller (6), gauge tap (8), quick charge socket (3), multiple battery (5), multiple wiping dish (17), organize fan blade (2) more, multiple drawing and pulling type dust box (18), multiple gear transmission speed reducing mechanism (4), multiple motor (7), multiple shaft coupling (11), multiple dust shield (12), multiple filter dirt screen net components (9) and multiple sleeve pipe (10), one end of blackboard eraser shell (16) is provided with uncovered, solar photovoltaic cell panel (1) is connected with controller (6), controller (6) is connected by power transmission line (13) with quick charge socket (3), multiple battery (5) to be arranged in blackboard eraser shell (16) and to be connected with quick charge socket (3), multiple battery (5) is connected one by one with the multiple motors (7) be arranged in blackboard eraser shell (16), blackboard eraser shell (16) sidewall is fixed with the gauge tap (8) simultaneously opened and closed for controlling multiple motor (7), the motor shaft of each motor (7) is connected by the input of shaft coupling (11) with gear transmission speed reducing mechanism (4), the wheel shaft of two driven gears (4-1) of each gear transmission speed reducing mechanism (4) is respectively fixed with one group of fan blade (2), the equal level of axle outer end of two driven gears (4-1) of each gear transmission speed reducing mechanism (4) is fixed with wiping dish (17), the wheel shaft of each driven gear (4-1) is together arranged in dust shield (12) together with fixed thereon one group of fan blade (2), the opening end that multiple wiping dish (17) is all arranged on blackboard eraser shell (16) is outside, the card of wiping dish (17) is provided with several aperture (17-1) communicated with dust shield, dust shield (12) is fixed in blackboard eraser shell (16), a drawing and pulling type dust box (18) be slidably connected with blackboard eraser shell (16) is horizontally disposed with between the wheel shaft of two driven gears (4-1) of each gear transmission speed reducing mechanism (4), blackboard eraser shell (16) sidewall is provided with drawing and pulling type dust box outlet port with each drawing and pulling type dust box (18) outer end opposite position, the wheel shaft upper ring cap of each described driven gear (4-1) is equipped with sleeve pipe (10), sleeve pipe (10) is fixed in filter dirt screen net component (9), filter dirt screen net component (9) is arranged in dust shield (12), described filter dirt screen net component (9) comprises multilayer filter dirt gauze, driving gear (4-2) lopsidedness from filter dirt screen net component (9) one end adjacent with drawing and pulling type dust box (18) to gear transmission speed reducing mechanism (4) and be positioned between drawing and pulling type dust box (18) and driven gear (4-1).
2. the semi-automatic dust absorption blackboard eraser of a kind of solar energy according to claim 1, it is characterized in that: described each gear transmission speed reducing mechanism (4) includes driving gear (4-2) and two driven gears (4-1), the wheel shaft input of driving gear (4-2) is connected by the motor shaft of shaft coupling (11) with motor (7), driving gear (4-2) engages with two driven gears (4-1), and two driven gears (4-1) are symmetricly set on the both sides of driving gear (4-2).
3. the semi-automatic dust absorption blackboard eraser of a kind of solar energy according to claim 1 and 2, it is characterized in that: the wheel shaft of described driven gear (4-1) is provided with a convex shoulder (4-3), one group of described fan blade (2) is fixed on convex shoulder (4-3) along the circumferencial direction of convex shoulder (4-3) is uniform.
4. the semi-automatic dust absorption blackboard eraser of a kind of solar energy according to claim 3, it is characterized in that: one group of described fan blade (2) comprises three fan blades (2), three fan blades (2) are welded on convex shoulder (4-3) along the circumferencial direction of convex shoulder is uniform.
5. the semi-automatic dust absorption blackboard eraser of a kind of solar energy according to claim 1, it is characterized in that: the card of described wiping dish (17) is for circular, gather and fixedly penetrated hairbrush (17-2) in the neighboring of the outer card of wiping dish (17), the soft silk floss that the middle part of the outer card of wiping dish (17) is provided with for blackboard wiping wipes (17-3), and the aperture (17-1) that described several and dust shield (12) communicates is arranged on the hairbrush (17-2) of wiping dish (17) and soft silk floss is wiped between (17-3).
6. the semi-automatic dust absorption blackboard eraser of a kind of solar energy according to claim 1, it is characterized in that: be fixed with many slideways (16-1) along described drawing and pulling type dust box (18) pull direction in described blackboard eraser shell (16), drawing and pulling type dust box (18) is slidably connected with slideway (16-1) by the pulley (14) be arranged on bottom it.
7. the semi-automatic dust absorption blackboard eraser of a kind of solar energy according to claim 1, it is characterized in that: described controller (6) is provided with the connectivity port for being connected with quick charge socket (3), the connectivity port of controller (6) is connected by described power transmission line (13) with quick charge socket (3).
8. the semi-automatic dust absorption blackboard eraser of a kind of solar energy according to claim 1, is characterized in that: described controller (6) is also connected with city's electronic compensating (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410445340.5A CN104191878B (en) | 2014-09-03 | 2014-09-03 | The semi-automatic dust absorption blackboard eraser of a kind of solar energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410445340.5A CN104191878B (en) | 2014-09-03 | 2014-09-03 | The semi-automatic dust absorption blackboard eraser of a kind of solar energy |
Publications (2)
| Publication Number | Publication Date |
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| CN104191878A CN104191878A (en) | 2014-12-10 |
| CN104191878B true CN104191878B (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410445340.5A Expired - Fee Related CN104191878B (en) | 2014-09-03 | 2014-09-03 | The semi-automatic dust absorption blackboard eraser of a kind of solar energy |
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Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003063196A (en) * | 2001-08-23 | 2003-03-05 | Hiroshi Ishikawa | Blackboard wiper cover for dust recovery |
| CN2686866Y (en) * | 2004-02-17 | 2005-03-23 | 林天硕 | Dust-free blackboard eraser |
| CN201484004U (en) * | 2009-06-30 | 2010-05-26 | 刘旭 | Environment-friendly blackboard eraser |
| CN201592611U (en) * | 2009-12-08 | 2010-09-29 | 周宇 | Blackboard eraser |
| CN201633411U (en) * | 2009-12-25 | 2010-11-17 | 上海工商信息学校 | Automatic blackboard eraser |
| CN201895512U (en) * | 2010-11-16 | 2011-07-13 | 张�杰 | Dust-absorbing blackboard eraser |
| CN102463809A (en) * | 2010-11-16 | 2012-05-23 | 张�杰 | Dust absorption blackboard eraser |
| CN201849208U (en) * | 2010-11-18 | 2011-06-01 | 佟兴 | Solar dust-absorbing blackboard eraser |
| CN102423986A (en) * | 2011-12-09 | 2012-04-25 | 樊荣 | Solar energy dust absorption blackboard eraser |
| CN202491613U (en) * | 2012-02-23 | 2012-10-17 | 山东科技大学 | Novel blackboard eraser |
| CN203739502U (en) * | 2014-01-09 | 2014-07-30 | 昆明理工大学 | Blackboard eraser |
| CN204020349U (en) * | 2014-09-03 | 2014-12-17 | 青岛大学附属中学 | The semi-automatic dust absorption blackboard eraser of a kind of solar energy |
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2014
- 2014-09-03 CN CN201410445340.5A patent/CN104191878B/en not_active Expired - Fee Related
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