CN203854375U - Dual-purpose writing and projection blackboard - Google Patents
Dual-purpose writing and projection blackboard Download PDFInfo
- Publication number
- CN203854375U CN203854375U CN201420213699.5U CN201420213699U CN203854375U CN 203854375 U CN203854375 U CN 203854375U CN 201420213699 U CN201420213699 U CN 201420213699U CN 203854375 U CN203854375 U CN 203854375U
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- China
- Prior art keywords
- band plate
- annular band
- bottom roll
- projection
- roller
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- Expired - Lifetime
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- 230000007246 mechanism Effects 0.000 claims abstract description 21
- 239000000428 dust Substances 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims description 19
- 229920001971 elastomer Polymers 0.000 claims description 7
- 239000005060 rubber Substances 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
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- Drawing Aids And Blackboards (AREA)
Abstract
The utility model discloses a dual-purpose writing and projection blackboard which comprises a roller transmission mechanism and an erasing mechanism. The roller transmission mechanism is mainly composed of an upper roller, a lower roller and a flexible annular band plate, wherein the upper roller and the lower roller are assembled on a support frame, and the flexible annular band plate is arranged on the upper roller and the lower roller in a tensioning and sleeved mode, a drive gear is assembled at the end of the lower roller, drive sheaves are formed in the end of the upper roller and the end of the lower roller at the same side, the sheave of the upper roller and the sheave of the lower roller are arranged together in a tensioning and sleeved mode through an annular traction rope and are driven synchronously, and the annular band plate is provided with a writing region and a projection screen region. The erasing mechanism is correspondingly arranged on the lower roller position and is mainly formed by a brush roller and a power collection groove which are assembled on the support frame, a hairbrush attached with the annular band plate is arranged on the circumference of the brush roller, the end of the brush roller is provided with a driven gear corresponding to the drive gear on the lower roller, and the power collection groove collects dust erased from the annular band plate. The dual-purpose writing and projection blackboard achieves convenient switching of writing and projection through the structure which is simple and convenient to manufacture, and the environmental protection property is good.
Description
Technical field
The utility model relates to teaching facilities, specifically one write, projection double-purpose blackboard.
Background technology
In modern education mechanism, blackboard and the projector equipment teaching facilities that are absolutely necessary; Wherein, blackboard is mainly used in the repeated writing in teaching; Projector equipment is mainly used in image or video to project on curtain, carries out directly perceived, modern explanation teaching.Because blackboard and projector equipment are diverse two kinds of teaching facilities, at present, common blackboard and projection screen are all separate splits,, in the time of needs repeated writing, on blackboard, carry out, and in the time of needs projection teaching, hang projection screen and carry out projection.This makes the teaching of blackboard and projector equipment switch very trouble, delays instructional blocks of time, and then affects quality of instruction.
In view of this, the scholar intentionally who pays close attention to education sector development has researched and developed and has variously write, the multi-functional blackboard of projection double-purpose, that appears in the newspapers repeatly has a dull and stereotyped plug-type (for example Chinese patent literature disclosed " projection, Double-purpose blackboard writes ", publication number: CN 201494176, open day: on June 2nd, 2010) and (for example Chinese patent literature disclosed " a kind of Multipurpose blackboard ", publication number: the CN 201745322, open day: on February 16th, 2011) of drum reel formula.Wherein, this drum reel formula is write, projection double-purpose blackboard is set up a projection screen moulding on conventional Scroll blackboard, specifically projection screen is fixed on by rope etc. on the rotating band of spool blackboard, according to action need projection screen is hidden in after blackboard or overhead before blackboard.Though realizing, it writes and projection double-purpose, the shortcoming that have complex structure, makes trouble, and this highlights the most, and the projection screen of setting up on spool blackboard requires closely to attach with blackboard outer wall, otherwise very easily occurs catching phenomenon in switching process; And the content of writing on this blackboard is by manually wiping, whole erase operations is large, the consuming time length of labour intensity not only, affect normal efficiency of teaching, and in erase operations dust from flying, the part dust flying upward drops on contiguous people or thing, in people's suction body of the another part dust person of being wiped free of or contiguous blackboard, health is caused and had a strong impact on.
Summary of the invention
The purpose of this utility model is: for above-mentioned the deficiencies in the prior art, provide a kind of simple in structure, easy to operate, be convenient to manufacture, the writing of environmental protection practicality, projection double-purpose blackboard.
The technical solution adopted in the utility model is, one is write, projection double-purpose blackboard, comprise drum drive mechanism and wipe mechanism, they specifically:
Described drum drive mechanism is mainly made up of upper cylinder, bottom roll and soft quality annular band plate; Described upper cylinder and bottom roll are assemblied on bracing frame by bearing correspondence respectively, the end of bottom roll is equipped with driving gear, the same side end of upper cylinder and bottom roll is respectively fitted with driving sheave, and the lower sheave on upper sheave and bottom roll on upper cylinder is fitted together, is synchronously driven by annular pulling rope tensioning sleeve; Described annular band plate is provided with writes district and projection screen district, and annular band plate tensioning sleeve is contained in transmission on cylinder and bottom roll, in company with the rotation of cylinder, and annular band plate is by the hard supporting plate bracketing being supported on bracing frame;
The described mechanism of wiping is mainly made up of brush roll and collection powder groove; Described brush roll by bearing assemble on bracing frame, corresponding at bottom roll place, on the circumference of brush roll, be provided with the hairbrush that attaches annular band plate outer wall, be provided with the driven gear corresponding with driving gear on bottom roll in the end of brush roll, bottom roll drives the driven gear of brush roll by driving gear; Described collection powder groove is sleeved on the outside of brush roll, collects hairbrush and wipes from annular band plate the dust getting off.
Further, the bracing frame between described bottom roll and brush roll is provided with jackshaft, on this jackshaft, is equipped with idler gear, and described idler gear engages respectively the driven gear in driving gear and the brush roll on bottom roll.
Further, the circumference of described upper cylinder and/or bottom roll is provided with friction structure.
Further, the inwall of described annular band plate is provided with friction structure.
Further, in the vallecular cavity of described upper sheave and/or lower sheave, be provided with friction structure.
Further, described pulling rope is Rubber tape rope, and this Rubber tape rope is provided with friction structure.
Further, the salient point that described friction structure is intensive layout or laterally raised line.
Further, the height of projection of described friction structure is 0.5～10mm.
Further, the lower race of described bottom roll or driving gear are provided with operation rocking bar.
Further, the cross section of the described collection powder groove shape that takes the shape of the letter U, collection powder groove to be to peg graft or the mode of pin joint is assemblied on bracing frame, collection powder groove upper along gap correspondence on the annular band plate outer wall at bottom roll place.
The beneficial effects of the utility model are:
1. above-mentioned drum reel formula blackboard is divided into flexible annular band plate to write district and projection screen district, transmission by annular band plate on upper and lower cylinder realizes the switching of different use functions (being blackboard writing or figure image projection), and it is simple in structure, easy to operate, be convenient to manufacture;
2. be provided with and wipe mechanism at bottom roll place, wipe written contents and other dust on annular band plate by wiping mechanism, thereby make dust on annular band plate by auto-erasing effectively, without dust from flying, practical, the feature of environmental protection is good;
3. there is the mechanism of wiping of idler gear, all the time guarantee the transmission direction of annular band plate contrary with the direction of rotation of hairbrush (be the annular band plate at bottom roll place by forward direction after when transmission, hairbrush in brush roll is by backward front rotation), thereby make the larger frictional force of formation between annular band plate and hairbrush, intensive hairbrush by the written contents on annular band plate and dust reliably, thoroughly, effectively wipe, is wiped effect and is further strengthened;
Between cylinder and annular band plate, drive the reasonable friction structure between sheave and pulling rope, make between them, not affecting under the prerequisite of driven rotation, to avoid skid, further improved operation ease and reliability, practical.
Brief description of the drawings
Below in conjunction with accompanying drawing, the utility model is further described.
Fig. 1 is a kind of structural representation of the present utility model.
Fig. 2 is the A-A view of Fig. 1.
Fig. 3 is that B local in Fig. 1 is to view.
Code name implication in figure: 1-upper sheave; 2-pulling rope; 3-lower sheave; 4-bracing frame; 5-collection powder groove; 6-hard supporting plate; 7-annular band plate; 8-upper cylinder; 9-bottom roll; 10-driving gear; 11-idler gear; 12-driven gear; 13-brush roll; 14-jackshaft; 15-hairbrush.
Detailed description of the invention
Referring to Fig. 1, Fig. 2 and Fig. 3, the utility model comprises drum drive mechanism and wipe mechanism, and their concrete structure and syntagmatic are as follows:
Drum drive mechanism is mainly made up of upper cylinder 8, bottom roll 9 and soft quality annular band plate 7.According to designed size, on metope, be fixed with two vertical supporting framves 4 of projection, the width of the corresponding moulding blackboard of distance of these two bracing frames 4, the height of the corresponding moulding blackboard of height of bracing frame 4.The length of upper cylinder 8 and bottom roll 9 is greater than two distances between bracing frame 4, on the circumference of upper cylinder 8 and bottom roll 9, be provided with friction structure in the mode of arranging intensive salient point respectively, the height of projection scope of this friction structure in upper cylinder 8 or bottom roll 9 circle wall is 0.5～10mm, for example 0.7～1.2mm, 3～6mm or 7～9mm etc., rationally determine, aforementioned upper cylinder 8 and bottom roll 9 are assemblied on bracing frame 4 by bearing correspondence separately respectively, go up cylinder 8 by bearing assemble the top at bracing frame 4, bottom roll 9 is the bottom at bracing frame 4 by bearing assemble, wherein the right-hand end of bottom roll 9 is equipped with driving gear 10, the left end of the left end of upper cylinder 8 and bottom roll 9 is respectively fitted with driving sheave, the driving sheave of going up cylinder 8 left sides is upper sheave 1, the driving sheave in bottom roll 9 left sides is lower sheave 3, lower sheave 3 positions on upper sheave 1 and bottom roll 9 in requirement on cylinder 8 are mutually corresponding, lower sheave 3 on upper sheave 1 and bottom roll 9 on upper cylinder 8 is fitted together, is synchronously driven by annular pulling rope 2 tensioning sleeves, in the time synchronously driving, there is skid phenomenon for fear of upper sheave 1 and lower sheave 3, in the vallecular cavity of upper sheave 1 and lower sheave 3, be provided with friction structure in the mode of arranging intensive salient point respectively, this friction structure is 0.5～10mm at the vallecular cavity internal projection altitude range of upper sheave 1 or lower sheave 3, for example 0.5～0.8mm, 1～3mm or 5～8mm etc., rationally determine, aforementioned pulling rope 2 is Rubber tape rope, is also provided with friction structure on this Rubber tape rope, and it arranges pattern specifically referring to the friction structure on upper sheave 1 or lower sheave 3.Soft quality annular band plate 7 adopts the composite molding such as epoxy resin or rubber, nylon cloth, and the outer surface of annular band plate 7 is divided into two regions, i.e. the projection screen district of writing district and light color (white or silver color etc.) of dark (black or green etc.); The wide cut of annular band plate 7 is less than two distances between bracing frame 4, is also provided with friction structure on the inwall of annular band plate 7, and it arranges pattern specifically referring to the friction structure on upper cylinder 8 or bottom roll 9; Annular band plate 7 tensioning sleeves are contained on cylinder 8 and bottom roll 9, the transmission in company with the rotation of cylinder; In writing process, there is enough hardness in order to ensure annular band plate 7; in annular band plate 7 between upper cylinder 8 and bottom roll 9, be provided with hard supporting plate 6; the both sides sidepiece of this hard supporting plate 6 by stent support on two bracing frames 4 of aforementioned body of wall projection; the inwall of the front surface of hard supporting plate 6 and annular band plate 7 attaches; and then annular band plate 7 is formed to bracketing; like this, just there is not the Flexible change that impact is write in annular band plate 7 in the time writing.
Friction structure on above-mentioned upper cylinder 8 and bottom roll 9 also can only be arranged on cylinder or bottom roll, same, friction structure on upper sheave 1 and lower sheave 3 also can only be arranged on sheave or lower sheave, but this setup can affect the friction effect of driving to a certain extent.In addition, also can to adopt height of projection scope be that the horizontal raised line of 0.5～10mm replaces to above-mentioned friction structure.
Wiping mechanism is mainly made up of brush roll 13 and collection powder groove 5.Brush roll 13 is by bearing assemble on above-mentioned bracing frame 4 and corresponding at bottom roll 9 places, and the distance between brush roll 13 and bottom roll 9 should be guaranteed that each spinning is unaffected and reserve the space of hairbrush 15; Be equipped with driven gear 12 in the left end of brush roll 13, require driving gear 10 positions on the corresponding bottom roll 9 in position of this driven gear 12; Left side bracing frame 4 between bottom roll 9 and brush roll 13 is provided with jackshaft 14, and the end of this jackshaft 14 is equipped with idler gear 11, requires idler gear 11 to engage respectively the driven gear 12 in driving gear 10 and the brush roll 13 on bottom roll 9; On the circumference of brush roll 13, be provided with the hairbrush 15 that attaches annular band plate 7 outer walls, the hairbrush 15 in brush roll 13 arranges the wide cut of the corresponding annular band plate 7 of wide cut.Wide cut, the width that the length of collection powder groove 5 is greater than annular band plate 7 is greater than the diameter of bottom roll 9, is highly greater than brush roll 13 diameters with hairbrush 15, the cross section of collection powder groove 5 shape that takes the shape of the letter U, this collection powder groove 5 is sleeved on the outside of brush roll 13, the mode activity such as (or pin joint) is assemblied on two bracing frames 4 pegging graft in the end of collection powder groove 5, collection powder groove 5 bottoms that assemble, sidewall respectively with hairbrush 15 formation gaps, end, the upper edge of peristome with gap mode correspondence on annular band plate 7 outer walls at bottom roll 9 places, preferably make to collect on the peristome of powder groove 5 along slightly up extending, stagger with the annular band plate 7 at bottom roll 9 places, thereby do not affecting under the prerequisite of annular band plate 7 transmissions, the annular band plate 7 at bottom roll 9 places is inlaid in collection powder groove 5, collect hairbrush 15 and wipe from annular band plate 7 dust getting off, environment protecting is farthest ensured.
The utility model according to requirements, by pulling rope 2 is imposed to external force, in driving, cylinder 8(drives by upper sheave 1) and bottom roll 9(drive by lower sheave 3) rotation, and then make on cylinder 8 and bottom roll 9 annular band plate 7 transmission along with the rotation of cylinder of suit; Writing of annular band plate 7 forms blackboard, projection screen district when district goes to front and while going to front, forms projection screen; In the transmission process of annular band plate 7, bottom roll 9 drives idler gear 11 to rotate by driving gear 10, idler gear 11 drives the driven gear 12 in brush roll 13 to rotate simultaneously, and then make the direction of rotation of bottom roll 9 and brush roll 13 contrary, it is annular band plate 7 transmission from front to back at bottom roll 9 places, hairbrush 15 in brush roll 13 rotates back to front, and then hairbrush 15 is wiped the dust including chalk writing on annular band plate 7.
For handled easily, can consider, on the lower race 3 of bottom roll 9 or driving gear 10, eccentric operation rocking bar is set, by the manual rotation operation to operation rocking bar, drive each rotary part to be rotated.
The mechanism of wiping of the present utility model is except employing idler gear drives; can also directly drive the driven gear in brush roll by the driving gear on bottom roll; engage by the driven gear in driving gear and brush roll on bottom roll; but form like this to wipe effect not ideal enough, on the annular band plate after wiping more or less have writing or a dust.
Bracing frame of the present utility model except adopt above-mentioned two overall, the parts that can also need to support for each arrange separate split bracing frame, upper and lower cylinder by their bracing frames be separately supported on metope, hard supporting plate by its bracing frame be supported on metope, that brush roll is supported on metope by its bracing frame is first-class.
Claims (10)
1. write, a projection double-purpose blackboard, comprise and it is characterized in that drum drive mechanism and wipe mechanism:
Described drum drive mechanism is mainly made up of upper cylinder (8), bottom roll (9) and soft quality annular band plate (7); Described upper cylinder (8) and bottom roll (9) are assemblied on bracing frame by bearing correspondence respectively, the end of bottom roll (9) is equipped with driving gear (10), the same side end of upper cylinder (8) and bottom roll (9) is respectively fitted with driving sheave, and the lower sheave (3) on upper sheave (1) and bottom roll (9) on upper cylinder (8) is fitted together, is synchronously driven by annular pulling rope (2) tensioning sleeve; Described annular band plate (7) is provided with writes district and projection screen district, annular band plate (7) tensioning sleeve is contained in cylinder (8) and bottom roll (9) is upper, the transmission in company with the rotation of cylinder, and annular band plate (7) is by hard supporting plate (6) bracketing being supported on bracing frame;
The described mechanism of wiping is mainly made up of brush roll (13) and collection powder groove (5); Described brush roll (13) by bearing assemble on bracing frame, corresponding locate at bottom roll (9), on the circumference of brush roll (13), be provided with the hairbrush (15) that attaches annular band plate (7) outer wall, be provided with the driven gear (12) corresponding with driving gear (10) on bottom roll (9) in the end of brush roll (13), bottom roll (9) drives the driven gear (12) of brush roll (13) by driving gear (10); Described collection powder groove (5) is sleeved on the outside of brush roll (13), collects hairbrush (15) and wipes from annular band plate (7) dust getting off.
2. write according to claim 1, projection double-purpose blackboard, it is characterized in that: the bracing frame between described bottom roll (9) and brush roll (13) is provided with jackshaft (14), on this jackshaft (14), be equipped with idler gear (11), described idler gear (11) engages respectively the driven gear (12) in driving gear (10) and the brush roll (13) on bottom roll (9).
3. write according to claim 1, projection double-purpose blackboard, it is characterized in that: the circumference of described upper cylinder (8) and/or bottom roll (9) is provided with friction structure.
4. write according to claim 1, projection double-purpose blackboard, it is characterized in that: the inwall of described annular band plate (7) is provided with friction structure.
5. write according to claim 1, projection double-purpose blackboard, it is characterized in that: in the vallecular cavity of described upper sheave (1) and/or lower sheave (3), be provided with friction structure.
6. write according to claim 1, projection double-purpose blackboard, it is characterized in that: described pulling rope (2) is Rubber tape rope, and this Rubber tape rope is provided with friction structure.
7. write according to described in claim 3,4,5 or 6, projection double-purpose blackboard, it is characterized in that: the salient point that described friction structure is intensive layout or laterally raised line.
8. write according to claim 7, projection double-purpose blackboard, it is characterized in that: the height of projection of described friction structure is 0.5～10mm.
9. write according to claim 1, projection double-purpose blackboard, it is characterized in that: lower race (3) or the driving gear (10) of described bottom roll (9) are provided with operation rocking bar.
10. write according to claim 1, projection double-purpose blackboard, it is characterized in that: the cross section of described collection powder groove (5) shape that takes the shape of the letter U, collection powder groove (5) is to peg graft or the mode of pin joint is assemblied on bracing frame, on upper annular band plate (7) outer wall of locating at bottom roll (9) along gap correspondence of collection powder groove (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420213699.5U CN203854375U (en) | 2014-04-29 | 2014-04-29 | Dual-purpose writing and projection blackboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420213699.5U CN203854375U (en) | 2014-04-29 | 2014-04-29 | Dual-purpose writing and projection blackboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203854375U true CN203854375U (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420213699.5U Expired - Lifetime CN203854375U (en) | 2014-04-29 | 2014-04-29 | Dual-purpose writing and projection blackboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203854375U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104464392A (en) * | 2014-12-03 | 2015-03-25 | 中国计量学院 | Control method of writing blackboard projection device for teaching |
| CN105329026A (en) * | 2015-11-30 | 2016-02-17 | 沈晶晶 | Multifunctional teaching aid |
| CN105365457A (en) * | 2015-11-30 | 2016-03-02 | 沈晶晶 | Multifunctional blackboard |
| CN106827882A (en) * | 2017-03-05 | 2017-06-13 | 刘金凤 | A kind of teaching aid of self-cleaning |
| CN109080331A (en) * | 2018-08-22 | 2018-12-25 | 王成帅 | A kind of grey dedusting storing blackboard of automatic wiping |
| CN109080330A (en) * | 2018-08-22 | 2018-12-25 | 王成帅 | It is a kind of to utilize the automatic teaching method for wiping grey dedusting storing blackboard |
| CN110673434A (en) * | 2019-09-10 | 2020-01-10 | 金陵科技学院 | Teaching device for computer major |
| CN111497498A (en) * | 2020-04-14 | 2020-08-07 | 珠海市络奥科技有限公司 | Visual multimode teaching blackboard based on internet |
| CN111638622A (en) * | 2020-06-09 | 2020-09-08 | 安徽励展文化科技有限公司 | Multimedia photoelectric projection interactive sand table system |
| CN112046174A (en) * | 2020-10-12 | 2020-12-08 | 桂林电子科技大学 | Teaching display device and method |
-
2014
- 2014-04-29 CN CN201420213699.5U patent/CN203854375U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104464392A (en) * | 2014-12-03 | 2015-03-25 | 中国计量学院 | Control method of writing blackboard projection device for teaching |
| CN105329026A (en) * | 2015-11-30 | 2016-02-17 | 沈晶晶 | Multifunctional teaching aid |
| CN105365457A (en) * | 2015-11-30 | 2016-03-02 | 沈晶晶 | Multifunctional blackboard |
| CN105365457B (en) * | 2015-11-30 | 2018-11-16 | 沈晶晶 | A kind of multi-functional blackboard |
| CN106827882A (en) * | 2017-03-05 | 2017-06-13 | 刘金凤 | A kind of teaching aid of self-cleaning |
| CN109080330A (en) * | 2018-08-22 | 2018-12-25 | 王成帅 | It is a kind of to utilize the automatic teaching method for wiping grey dedusting storing blackboard |
| CN109080331A (en) * | 2018-08-22 | 2018-12-25 | 王成帅 | A kind of grey dedusting storing blackboard of automatic wiping |
| CN110673434A (en) * | 2019-09-10 | 2020-01-10 | 金陵科技学院 | Teaching device for computer major |
| CN111497498A (en) * | 2020-04-14 | 2020-08-07 | 珠海市络奥科技有限公司 | Visual multimode teaching blackboard based on internet |
| CN111497498B (en) * | 2020-04-14 | 2021-10-01 | 珠海市络奥科技有限公司 | Visual multimode teaching blackboard based on internet |
| CN111638622A (en) * | 2020-06-09 | 2020-09-08 | 安徽励展文化科技有限公司 | Multimedia photoelectric projection interactive sand table system |
| CN112046174A (en) * | 2020-10-12 | 2020-12-08 | 桂林电子科技大学 | Teaching display device and method |
| CN112046174B (en) * | 2020-10-12 | 2024-05-21 | 桂林电子科技大学 | Display method of display device for teaching |
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