CN111948895A - A projection curtain automatic start/stop structure for building teaching - Google Patents
A projection curtain automatic start/stop structure for building teaching Download PDFInfo
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- CN111948895A CN111948895A CN202010920838.8A CN202010920838A CN111948895A CN 111948895 A CN111948895 A CN 111948895A CN 202010920838 A CN202010920838 A CN 202010920838A CN 111948895 A CN111948895 A CN 111948895A
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- curtain
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/02—Electrically-operated educational appliances with visual presentation of the material to be studied, e.g. using film strip
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- Theoretical Computer Science (AREA)
- Curtains And Furnishings For Windows Or Doors (AREA)
Abstract
The invention discloses an automatic opening and closing structure of a projection curtain for building teaching, relates to the technical field of teaching equipment, solves the problems that the existing projection curtain occupies space, influences the appearance and is easy to shake, and comprises a supporting base; a group of front and back symmetrical lower supporting plates are fixedly arranged at the top of the supporting base; two groups of scissor mechanisms are fixedly and symmetrically arranged on two sides of the lower supporting plate; the bottoms of the front part and the rear part of each of the two groups of scissors mechanisms are fixedly connected with an adjusting round rod; the inner side of the curtain fixing plate is fixedly provided with a curtain main body through eight curtain fixing frames; and a photosensitive sensor is fixedly embedded in the front side of the curtain fixing plate. Can rise automatically and put the projection cloth down during the projection, it is more convenient to use, and the device is whole to be folded through cutting fork mechanism drive when not using, reduces whole height, reduces to occupy indoor vertical space, reduces sheltering from to the rear object, improves indoor whole aesthetic property.
Description
Technical Field
The invention relates to the technical field of teaching equipment, in particular to an automatic opening and closing structure of a projection curtain for building teaching.
Background
At present, a projection curtain body is a tool used for displaying images or video files in the occasions of movies, offices, home theaters and large conferences, and the projection curtain body is also called a projection screen and is generally matched with a projector for use. In the existing teaching system, a projector is often used for playing PPT, and the efficiency and quality of classroom education can be greatly improved by introducing the projector into the teaching environment.
For example, application number is 201922252478.4's patent, discloses a projection curtain automatic rising structure for extraterrestrial tutoring, including supporting the base, support the upper end of base and install two sets of telescopic links, the lower extreme surface of supporting the base is provided with the bearing wheel, the bearing mechanism is installed in the place ahead of the bearing wheel of the lower extreme surface of supporting the base, the connection horizontal pole is installed at the top of two sets of telescopic links, fixed slot and fixed establishment are installed respectively to the front end surface of two sets of telescopic links, be provided with the curtain main part between fixed slot and the fixed establishment, the lower extreme of the connection horizontal pole of the upper end of curtain main part is connected with the couple. A class is projection curtain automatic rising structure for tutor, can be convenient for install, dismantle the curtain, and can improve the steadiness when using.
Based on the above, when the existing projection curtain needs projection, the curtain needs to be manually opened, the operation is time-consuming and labor-consuming, some curtain frames placed on the ground are of fixed structures and always keep the highest height, so that more indoor longitudinal space is occupied, the rear part is shielded, the indoor attractiveness is affected, no object is used for fixing the edge of the projection curtain after the projection curtain is put down, the projection curtain shakes due to air flowing in a room, and the normal viewing is affected when the shaking range is too large; therefore, the existing requirements are not met, and the automatic opening and closing structure of the projection curtain for building teaching is provided for the requirements.
Disclosure of Invention
The invention aims to provide an automatic opening and closing structure of a projection curtain for building teaching, which solves the problems that the existing projection curtain in the prior art needs to be manually opened when projection is needed, the operation is time-consuming and labor-consuming, some curtain frames placed on the ground are of fixed structures and always keep the highest height, so that more indoor longitudinal space is occupied, the rear part is shielded, the indoor appearance is influenced, no object is used for fixing the edge of the projection curtain after the projection curtain is put down, the projection curtain shakes due to air flowing in a room, and the normal watching is influenced when the shaking amplitude is too large.
In order to achieve the purpose, the invention provides the following technical scheme: an automatic opening and closing structure of a projection curtain for building teaching comprises a supporting base; a group of front and back symmetrical lower supporting plates are fixedly arranged at the top of the supporting base; two groups of scissor mechanisms are fixedly and symmetrically arranged on two sides of the lower supporting plate; the bottoms of the front part and the rear part of each of the two groups of scissors mechanisms are fixedly connected with an adjusting round rod; the outer sides of the middle parts of the adjusting round rods are rotatably connected with an adjusting block; a double-shaft motor is fixedly arranged in the middle of the top of the supporting base; two ends of a rotating shaft of the double-shaft motor are fixedly connected with a threaded rod, and the two threaded rods are respectively embedded into the two adjusting blocks through threads and extend outwards from the other side; the middle connecting positions of the two groups of the scissors mechanisms are fixedly connected with six connecting rods in front and at back; two curtain clamping blocks are fixedly arranged on the outer sides of the six connecting rods close to the inner side; the tops of the two groups of scissor mechanisms are fixedly embedded into the inner sides of the two ends of the upper supporting plate; the top of the upper supporting plate is fixedly connected with a group of curtain fixing plates; the inner side of the curtain fixing plate is fixedly provided with a curtain main body through eight curtain fixing frames; a projection cloth is fixedly arranged on the inner side of the curtain main body; and a photosensitive sensor is fixedly embedded in the front side of the curtain fixing plate.
Preferably, the part of one side of the scissors mechanism close to the outside is respectively fixedly connected with the lower support plate and the upper support plate through a rotating shaft, four strip-shaped grooves with the same length and height are respectively and fixedly and symmetrically arranged on the front side and the rear side of the lower support plate and the upper support plate, and the part of one side of the scissors mechanism close to the inside is respectively connected with the strip-shaped grooves on the front side and the rear side of the lower support plate and the upper support plate through a rotating shaft in a sliding manner.
Preferably, all be provided with a horizontal screw hole on the regulating block, and two threaded rods imbed respectively in these two screw holes and with inside screw thread looks gomphosis, can move about the regulating block through the screw drive when the threaded rod is rotatory.
Preferably, can drive when the regulating block moves about and cut a side tip that the fork mechanism is close to inboard and slide from side to side in the bar groove of bottom suspension fagging and last backup pad front and back side to it stretches out and draws back to make to cut the rotation of fork mechanism, and then can drive backup pad and curtain fixed plate and reciprocate.
Preferably, the outside screw thread of two threaded rods of biax motor both sides is reverse screw, therefore can drive two regulating blocks simultaneously and inwards move or outwards move simultaneously when the threaded rod synchronous revolution.
Preferably, when the scissors mechanisms are completely extended to the maximum, the minimum transverse distance between the two scissors mechanisms is greater than the width of the projection cloth, and the projection cloth is positioned between the two scissors mechanisms after being dropped downwards.
Preferably, photosensitive sensor passes through the wire and is connected with external control ware, and the controller passes through wire and the interior motor electric connection that receive and releases of biaxial motor and curtain main part respectively, can control the operation of biaxial motor earlier after photosensitive sensor senses projecting apparatus light, goes up the backup pad and rises to the highest back and then controls the interior motor operation that receives and releases of curtain main part and fall the projection cloth downwards.
Preferably, the curtain presss from both sides all fixedly in the middle of tight piece one side of clamp and is provided with a round hole, and the curtain presss from both sides tight piece and can slide around the connecting rod outside, and the tight piece of curtain clamp is magnet to make moreover, and one side still all is fixed and is provided with an anti-skidding rubber, can press from both sides the projection cloth edge in the middle of when two adjacent curtains press from both sides tight piece absorption, and anti-skidding rubber can with the marginal in close contact with of projection cloth.
Compared with the prior art, the invention has the beneficial effects that:
firstly, the backup pad will be moved to the peak on needing when the projection, then the receipts and releases the motor operation in the controller control curtain main part and fall the projection cloth downwards, can carry out the projection like this, can rise automatically and fall the projection cloth during the projection, it is more convenient to use, after using, earlier through the receipts and releases the motor operation in the controller control curtain main part and upwards pack up the projection cloth, then control biax motor antiport, two regulating blocks can move to the inboard respectively this moment, thereby make the scissors mechanism reduce to minimumly, it can fall to the minimum to go up the backup pad, the device whole can be folded through scissors mechanism drive when not using, reduce overall height, reduce and occupy indoor longitudinal space, reduce the sheltering from to the rear object, improve indoor whole aesthetic property.
Second, the curtain presss from both sides the middle all fixed round hole that is provided with of tight piece one side, the curtain presss from both sides tight piece and can slide around the connecting rod outside, and the curtain presss from both sides tight piece and is magnet and makes, one side still all is fixed and is provided with an anti-skidding rubber, can press from both sides the projection cloth edge in the middle of when two adjacent curtains press from both sides tight piece absorption, and anti-skidding rubber can with the marginal in close contact with of projection cloth, put down the back with the projection cloth, the explanation personnel can the tight piece of six curtain clamp of manual movement, make two adjacent curtains press from both sides tight piece absorption and press from both sides the projection cloth edge tightly, the anti-skidding rubber of curtain clamp piece one side can prevent that the projection cloth breaks away from, consequently, six curtain clamp tight pieces can fix projection cloth both sides edge, the projection cloth can not produce rocking by a relatively large margin yet when indoor stronger air flows.
Drawings
FIG. 1 is a schematic view of a bent axis side structure of the present invention after the projection cloth is lifted and lowered;
FIG. 2 is a schematic view of the bottom side structure of the present invention with the projection cloth raised and the projection cloth lowered;
FIG. 3 is a schematic view of a bent axis side structure of the present invention after the projection cloth is lifted and retracted;
FIG. 4 is a schematic view of a bent axis side structure of the folded projection cloth of the present invention;
FIG. 5 is a schematic view of the bottom side structure of the present invention with the projection cloth folded;
FIG. 6 is an enlarged partial view of FIG. 1 at point A;
FIG. 7 is an enlarged partial view of the structure of FIG. 1 at point B;
FIG. 8 is an enlarged partial view of the structure of FIG. 3 at point C;
in the figure: 1. a support base; 2. a double-shaft motor; 3. a threaded rod; 4. a lower support plate; 5. a scissor mechanism; 6. adjusting the round bar; 7. an adjusting block; 8. a connecting rod; 9. an upper support plate; 10. a curtain fixing plate; 11. a curtain fixing frame; 12. a curtain main body; 13. a curtain clamping block; 14. a projection cloth; 15. a light-sensitive sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1 to 8, an embodiment of the present invention includes: an automatic opening and closing structure of a projection curtain for building teaching comprises a supporting base 1; a group of front and back symmetrical lower supporting plates 4 are fixedly arranged at the top of the supporting base 1; two groups of scissor mechanisms 5 are fixedly and symmetrically arranged on two sides of the lower supporting plate 4; one side end part of the scissors mechanism 5 close to the outer side is fixedly connected with the lower supporting plate 4 and the upper supporting plate 9 through a rotating shaft respectively, four strip-shaped grooves with the same length and height are fixedly and symmetrically arranged on the front side and the rear side of the lower supporting plate 4 and the front side and the rear side of the upper supporting plate 9 respectively, one side end part of the scissors mechanism 5 close to the inner side is slidably connected with the strip-shaped grooves on the front side and the rear side of the lower supporting plate 4 and the front side and the rear side of the upper supporting plate 9 through a rotating shaft respectively, when the scissors mechanism is used, the double-shaft motor 2 operates to drive the two threaded rods 3 to rotate synchronously, at the moment, the two adjusting blocks 7 move outwards respectively, so that the scissors mechanism 5 extends to the highest position, at the moment, the double-shaft motor 2 stops operating; the bottoms of the front part and the rear part of each of the two groups of scissors mechanisms 5 are fixedly connected with an adjusting round rod 6; the outer sides of the middle parts of the adjusting round rods 6 are rotatably connected with an adjusting block 7; the adjusting block 7 is provided with a transverse threaded hole, the two threaded rods 3 are respectively embedded into the two threaded holes and are embedded with internal threads, and the threaded rods 3 can drive the adjusting block 7 to move left and right through the threads when rotating, so that the scissor mechanism 5 can be driven to contract; a double-shaft motor 2 is fixedly arranged in the middle of the top of the supporting base 1; the external threads of the two threaded rods 3 on the two sides of the double-shaft motor 2 are reverse threads, so that the two adjusting blocks 7 can be synchronously driven to simultaneously move inwards or outwards when the threaded rods 3 synchronously rotate, the photosensitive sensor 15 can transmit signals to the controller after sensing light of the projector, the controller firstly controls the double-shaft motor 2 to operate to drive the two threaded rods 3 to synchronously rotate, and at the moment, the two adjusting blocks 7 can respectively move outwards, so that the scissor mechanism 5 extends to the maximum; two ends of a rotating shaft of the double-shaft motor 2 are fixedly connected with a threaded rod 3, and the two threaded rods 3 are respectively embedded into two adjusting blocks 7 through threads and extend outwards from the other side; the middle connecting positions of the two groups of scissors mechanisms 5 are fixedly connected with six connecting rods 8 in front and at back; two curtain clamping blocks 13 are fixedly arranged on the outer sides of the six connecting rods 8 close to the inner sides; the tops of the two groups of scissor mechanisms 5 are fixedly embedded and arranged at the inner sides of the two ends of the upper supporting plate 9; the top of the upper supporting plate 9 is fixedly connected with a group of curtain fixing plates 10; the inner side of the curtain fixing plate 10 is fixedly provided with a curtain main body 12 through eight curtain fixing frames 11; a projection cloth 14 is fixedly arranged on the inner side of the curtain main body 12; a photosensitive sensor 15 is fixedly embedded in the front side of the curtain fixing plate 10.
Further, can drive when the regulating block 7 removes and cut fork mechanism 5 and be close to inboard a lateral part and slide from side to side in the bar groove of backup pad 4 and last backup pad 9 front and back side, thereby it stretches out and draws back to make to cut fork mechanism 5 rotatory, and then can drive backup pad 9 and curtain fixed plate 10 and reciprocate, photosensitive sensor 15 senses can transmit signal and give the controller behind the projecting apparatus light, 2 operation drive two threaded rods 3 synchronous rotations of controller control double-shaft motor earlier, two regulating blocks 7 can move to the outside respectively this moment, thereby make to cut fork mechanism 5 extension until highest.
Further, when scissors mechanism 5 extends to the highest completely, the minimum horizontal interval of two sets of scissors mechanisms 5 is greater than the width of projection cloth 14, and projection cloth 14 can be located between two sets of scissors mechanisms 5 after downwards falling, conveniently falls projection cloth 14 downwards and can not produce the friction, can not cause the sheltering from to the projection moreover.
Further, photosensitive sensor 15 is connected with external control ware through the wire, the controller respectively through wire and the biax motor 2 and the interior receipts of curtain main part 12 receive and release motor electric connection, can control the operation of biax motor 2 earlier after photosensitive sensor 15 senses projecting apparatus light, go up the backup pad 9 and rise to and control the receipts in the curtain main part 12 again and receive and release the motor operation and put projection cloth 14 down after the highest, can rise automatically and put projection cloth 14 down during the projection, it is more convenient to use.
Further, a round hole is fixedly arranged in the middle of one side of the curtain clamping block 13, the curtain clamping block 13 can slide back and forth on the outer side of the connecting rod 8, the curtain clamping blocks 13 are made of magnets, one side of each curtain clamping block is fixedly provided with an anti-slip rubber, when the two adjacent curtain clamping blocks 13 are adsorbed, the edge of the projection cloth 14 is clamped between the two adjacent curtain clamping blocks, and the anti-slip rubber is tightly contacted with the edge of the projection cloth 14, after the projection cloth 14 is put down, the explaining personnel can manually move the six sets of curtain clamping blocks 13 to enable the two adjacent curtain clamping blocks 13 to adsorb and clamp the edge of the projection cloth 14, the antiskid rubber at one side of the curtain clamping blocks 13 can prevent the projection cloth 14 from being separated, so that the six sets of curtain clamping blocks 13 can fix the edges at two sides of the projection cloth 14, when strong air flows indoors, the projection cloth 14 cannot shake to a large extent, and normal watching is guaranteed.
The working principle is as follows: when the device is used, the folded device is placed on the ground at the projection position of a projector, the device can be directly placed on the ground without punching due to hanging on a wall surface, the device is more flexible and convenient to move, when the projector is opened, the photosensitive sensor 15 senses the light of the projector and transmits a signal to the controller, the controller firstly controls the operation of the double-shaft motor 2 to drive the two threaded rods 3 to synchronously rotate, at the moment, the two adjusting blocks 7 respectively move towards the outer side, so that the scissor mechanism 5 extends to the maximum, at the moment, the double-shaft motor 2 stops operating, the upper supporting plate 9 moves to the maximum point, then the controller controls the operation of the retracting and releasing motor in the curtain main body 12 to retract the projection cloth 14 downwards, the projection can be carried out, the projection can be automatically lifted and the projection cloth 14 can be retracted during projection, the use is more convenient, after the use, the controller firstly controls the operation of the retracting and releasing motor in the curtain main body 12 to retract the projection cloth, then control biax motor 2 counter rotation again, two regulating blocks 7 can move to the inboard respectively this moment to make and cut fork mechanism 5 and reduce to minimum, go up backup pad 9 and can descend to the minimum, the device whole can drive through cutting fork mechanism 5 and fold when not using, reduce overall height, reduce and occupy indoor longitudinal space, reduce the sheltering from to the rear object, and after putting projection cloth 14 down, the explanation personnel can manual movement six groups of curtain clamp piece 13, make two adjacent curtain clamp piece 13 adsorb and press from both sides the edge of projection cloth 14 tightly, the antiskid rubber of curtain clamp piece 13 one side can prevent projection cloth 14 and break away from, therefore six groups of curtain clamp piece 13 can fix projection cloth 14 both sides edge, projection cloth 14 also can not produce rocking by a relatively large margin when having stronger air to flow in the room, guarantee normally to watch.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. The utility model provides a projection curtain automatic start/stop structure for building teaching which characterized in that: comprising a support base (1); a group of lower supporting plates (4) which are symmetrical front and back are fixedly arranged at the top of the supporting base (1); two groups of scissor mechanisms (5) are fixedly and symmetrically arranged on two sides of the lower supporting plate (4); the bottoms of the front part and the rear part of each of the two groups of scissors mechanisms (5) are fixedly connected with an adjusting round rod (6); the outer sides of the middle parts of the adjusting round rods (6) are rotatably connected with an adjusting block (7); a double-shaft motor (2) is fixedly arranged in the middle of the top of the supporting base (1); two ends of a rotating shaft of the double-shaft motor (2) are fixedly connected with a threaded rod (3), and the two threaded rods (3) are respectively embedded into the two adjusting blocks (7) through threads and extend outwards from the other side; the middle connecting positions of the two groups of the scissors mechanisms (5) are fixedly connected with six connecting rods (8) in front and back; two curtain clamping blocks (13) are fixedly arranged on the outer sides of the six connecting rods (8) close to the inner side; the tops of the two groups of scissor mechanisms (5) are fixedly embedded and installed at the inner sides of the two ends of the upper supporting plate (9); the top of the upper supporting plate (9) is fixedly connected with a group of curtain fixing plates (10); the inner side of the curtain fixing plate (10) is fixedly provided with a curtain main body (12) through eight curtain fixing frames (11); a projection cloth (14) is fixedly arranged on the inner side of the curtain main body (12); and a photosensitive sensor (15) is fixedly embedded in the front side of the curtain fixing plate (10).
2. The projection curtain automatic opening and closing structure for building teaching of claim 1, characterized in that: cut a lateral part that fork mechanism (5) is close to the outside and do not be through pivot and bottom suspension fagging (4) and last backup pad (9) fixed connection, and bottom suspension fagging (4) and the equal fixed symmetry in front and back side of going up backup pad (9) are provided with four length and the bar groove of height-alike, cut a lateral part that fork mechanism (5) is close to inboard and do not through pivot and bottom suspension fagging (4) and the bar groove sliding connection of going up backup pad (9) front and back side.
3. The projection curtain automatic opening and closing structure for building teaching of claim 1, characterized in that: all be provided with a horizontal screw hole on regulating block (7), and two threaded rods (3) imbed respectively in these two screw holes and with inside screw thread looks gomphosis, can remove about regulating block (7) through the screw thread drive when threaded rod (3) are rotatory.
4. The projection curtain automatic opening and closing structure for building teaching of claim 1, characterized in that: when adjusting block (7) remove about can drive and cut fork mechanism (5) and be close to inboard a side end in the bar groove horizontal slip of side around bottom suspension fagging (4) and last backup pad (9) to it stretches out and draws back to make to cut fork mechanism (5) rotation, and then can drive backup pad (9) and curtain fixed plate (10) and reciprocate.
5. The projection curtain automatic opening and closing structure for building teaching of claim 1, characterized in that: two threaded rod (3) outside screw threads of biax motor (2) both sides are reverse screw, consequently can drive two regulating blocks (7) simultaneously and move to the inboard or move to the outboard simultaneously when threaded rod (3) synchronous revolution.
6. The projection curtain automatic opening and closing structure for building teaching of claim 1, characterized in that: when the scissor fork mechanisms (5) are completely extended to the maximum, the minimum transverse distance between the two scissor fork mechanisms (5) is larger than the width of the projection cloth (14), and the projection cloth (14) can be positioned between the two scissor fork mechanisms (5) after being downwards placed.
7. The projection curtain automatic opening and closing structure for building teaching of claim 1, characterized in that: photosensitive sensor (15) are connected with external control ware through the wire, and the controller respectively through wire and the biax motor (2) and the interior receipts and release motor electric connection of curtain main part (12), can control biax motor (2) operation earlier after photosensitive sensor (15) sense the projecting apparatus light, go up backup pad (9) and rise to and control the receipts and release motor operation in curtain main part (12) again after the highest and drop projecting cloth (14) downwards.
8. The projection curtain automatic opening and closing structure for building teaching of claim 1, characterized in that: the curtain presss from both sides all fixed round hole that is provided with in the middle of tight piece (13) one side of clamp, and the curtain presss from both sides tight piece (13) and can slide around connecting rod (8) outside, and the curtain presss from both sides tight piece (13) and is made magnet, and one side still all is fixed and is provided with an anti-skidding rubber, and two adjacent curtains can clamp projection cloth (14) edge clamp in the middle of when pressing from both sides tight piece (13) absorption, and anti-skidding rubber can with the edge in close contact with of projection cloth (14).
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| CN202010920838.8A CN111948895A (en) | 2020-09-04 | 2020-09-04 | A projection curtain automatic start/stop structure for building teaching |
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| CN202010920838.8A CN111948895A (en) | 2020-09-04 | 2020-09-04 | A projection curtain automatic start/stop structure for building teaching |
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| CN112863257A (en) * | 2021-01-21 | 2021-05-28 | 菏泽学院 | Case analysis device for political and economic teaching |
| CN112863257B (en) * | 2021-01-21 | 2022-04-29 | 菏泽学院 | Case analysis device for political and economic teaching |
| CN113623507A (en) * | 2021-08-13 | 2021-11-09 | 江苏舜合物联网科技有限公司 | Curling curtain lifting device |
| CN113623507B (en) * | 2021-08-13 | 2022-04-08 | 江苏舜合物联网科技有限公司 | Curling curtain lifting device |
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Application publication date: 20201117 |