CN113183662B - Teaching device for artistic training - Google Patents
Teaching device for artistic training Download PDFInfo
- Publication number
- CN113183662B CN113183662B CN202110503817.0A CN202110503817A CN113183662B CN 113183662 B CN113183662 B CN 113183662B CN 202110503817 A CN202110503817 A CN 202110503817A CN 113183662 B CN113183662 B CN 113183662B
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- Prior art keywords
- wiping
- block
- controller
- rod
- winding roller
- Prior art date
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- 230000007246 mechanism Effects 0.000 claims abstract description 16
- 238000004804 winding Methods 0.000 claims description 20
- 230000002146 bilateral effect Effects 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 229920002457 flexible plastic Polymers 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
Classifications
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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
- B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B97/00—Furniture or accessories for furniture, not provided for in other groups of this subclass
- A47B97/04—Easels or stands for blackboards or the like
-
- 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
Landscapes
- Toys (AREA)
- Drawing Aids And Blackboards (AREA)
Abstract
The invention relates to the technical field of art training teaching aids, and discloses a teaching device for art training, which comprises a shell, a wiping mechanism, a writing board, a backboard, a base, a movable frame, a controller and a remote controller, wherein the front side of the shell is provided with a containing cavity; the problem of current teaching whiteboard function singleness, height and angle are inconvenient for adjusting, do not possess the ability of cleaning voluntarily yet to write the space limited, lead to influencing teaching efficiency and quality is solved.
Description
Technical Field
The invention relates to the technical field of artistic training teaching aids, in particular to a teaching device for artistic training.
Background
The artistic training is the standard of modern students, many teaching devices can be used in the training process, wherein the most of the teaching devices are used as teaching whiteboards, but the most functions of the existing teaching whiteboards are single, the height is certain, automatic wiping cannot be carried out in the using process, and the adjustment of a long-distance angle cannot be realized, so that a great deal of inconvenience is brought to training staff, meanwhile, the teaching efficiency is influenced, the writing time of writing contents on the whiteboards is short because the writing space of the whiteboards is limited, the writing records or the memory mastering of the students are not facilitated, and the learning efficiency and the quality of the students are further influenced, so that the teaching device for the artistic training is needed to solve the problems.
Disclosure of Invention
The invention provides a teaching device for artistic training, which has the advantages of complete functions, capability of remotely adjusting the height and the angle and abundant writing space, and solves the problems that the existing teaching whiteboard has single function, inconvenient adjustment of the height and the angle, automatic wiping capability and limited writing space, thereby influencing the teaching efficiency and the teaching quality.
The invention provides the following technical scheme: the utility model provides a teaching device for artistic training, includes casing, wiping mechanism, clipboard, backplate, base, movable frame, controller and remote controller, the casing front side is equipped with the holding chamber, wiping mechanism sets up holding chamber left and right sides, backplate fixed connection is in holding chamber middle part, the backplate rear side is equipped with first coiling roller and second coiling roller, first coiling roller with the second coiling roller is with respect to backplate axis bilateral symmetry sets up, first coiling roller lower extreme is connected with first motor, second coiling roller lower extreme is connected with the second motor, clipboard one end with first coiling roller fixed connection, the clipboard other end with second coiling roller fixed connection, the clipboard laminating is in the backplate front side, wiping mechanism with clipboard intermittent type nature contact connection, the base sets up the casing below, base top center is equipped with first pneumatic cylinder, first pneumatic cylinder output fixedly connected with turning block, the casing rear side center is equipped with the turning block, clipboard one end with first motor, the movable frame is in the first controller, the controller is in the base, the movable frame is in the first controller is in the turning block.
Preferably, the wiping mechanism comprises a rotating plate, a first driving rod, a first driving block, a second hydraulic cylinder, a wiping plate and a wiping pad, wherein a driving groove is formed in the top of the shell, fixing plates are fixedly connected to the left side and the right side of the accommodating cavity respectively, one side of the rotating plate is connected with the fixing plates in a rotating fit mode, the other side of the rotating plate is hinged to one end of the first driving rod, the second hydraulic cylinder is fixedly connected to the rear side of the driving groove, the first driving block is fixedly connected to the output end of the second hydraulic cylinder, the other end of the first driving rod is connected with the first driving block in a rotating fit mode, a connecting rod is fixedly connected to the inner side of the other end of the rotating plate, the wiping plate is fixedly connected with the connecting rod, the wiping pad is detachably connected to the wiping plate, the wiping pad is abutted to the writing plate, and the second hydraulic cylinder is electrically connected with the controller.
Preferably, the length of the wiping plate and the wiping pad is equal to the width of the writing plate, and the wiping pad is made of sponge or cloth.
Preferably, the left side and the right side of the rotating block are respectively provided with a third hydraulic cylinder, the output end of the third hydraulic cylinder is fixedly connected with a second driving rod, the second driving rod is respectively hinged with the two sides of the rear end of the shell, and the third hydraulic cylinder is electrically connected with the controller.
Preferably, the writing board is made of flexible plastic, the width of the back plate is larger than that of the writing board, and two ends of the front side of the back plate are respectively provided with an arc surface.
Preferably, the movable frame comprises a threaded rod, a second driving block, a third driving block, universal wheels, a third motor, a third driving rod, a clamping plate and a rotating rod, wherein the third motor is embedded in the right inner wall of the lifting groove, one end of the threaded rod is fixedly connected with the output end of the third motor, the other end of the threaded rod is in rotating fit connection with the left inner wall of the lifting groove, the clamping plates are respectively fixedly connected with the left inner wall and the right inner wall of the lifting groove, the clamping plates are symmetrically arranged front and back, the upper ends of the universal wheels are connected with the clamping plates in a rotating fit manner, the rotating rod is connected with the middle of the universal wheels in a rotating fit manner, the second driving block is respectively in threaded connection with the third driving block, one end of the third driving rod is connected with the rotating rod in a rotating fit manner, the other end of the third driving rod is respectively hinged with the second driving block and the third driving block, and the third motor is electrically connected with the controller.
Preferably, the second driving block is in a spiral direction opposite to the third driving block.
The invention has the following beneficial effects:
1. the invention can remotely control the device, realize the height and angle adjustment of the device, automatic wiping and other operations, bring great convenience to training staff, and improve the teaching efficiency and quality.
2. The invention is provided with the wiping mechanism, does not need to be manually wiped, can realize automatic wiping work of the writing board through contact and non-contact with the writing board, and is arranged on two sides, and can repeatedly wipe, so that the writing board is wiped more cleanly.
3. According to the invention, the adjustment of the device angle can be realized through the mutual coordination of the third hydraulic cylinders arranged on the rotating block, and the adjustment of the device height can be realized through the first hydraulic cylinders, and the device can be remotely controlled, so that training staff can conveniently adjust at any time and any place in the process of patrol teaching in a training field.
4. According to the invention, the two ends of the writing board are respectively coiled through the coiling rollers, so that after the leaked part is fully written, the written part can be coiled through the mutual matching of the coiling rollers, the blank part which is not written is leaked for writing, and when the front part is required to be consulted, the writing board is unfolded, thereby being very beneficial to students to record and master.
5. According to the invention, the movable frame is arranged in the base, so that the movable device can be supported only when the movable device is needed, the movable device is convenient to move, and can be folded when the movable device is not needed, so that the movable device can be stably erected on the ground, and the movable device cannot be tilted or moved due to easy collision or other external factors.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a schematic cross-sectional view at A-A of FIG. 1;
FIG. 4 is a schematic cross-sectional view at B-B in FIG. 1;
FIG. 5 is a schematic top view of the present invention;
FIG. 6 is a schematic cross-sectional view at C-C of FIG. 3;
fig. 7 is a schematic structural diagram of a remote controller according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1 to 7, a teaching device for artistic training includes a housing 1, a wiping mechanism 2, a writing board 3, a back plate 4, a base 5, a movable frame 6, a controller 7, and a remote controller 8.
The front side of the casing 1 is provided with an accommodating cavity 11, the wiping mechanism 2 is arranged at the left side and the right side of the accommodating cavity 11, the back plate 4 is fixedly connected to the middle part of the accommodating cavity 11, the back plate 4 is used for supporting force of writing compression, the back plate 4 is provided with a first winding roller 33 and a second winding roller 34, the first winding roller 33 and the second winding roller 34 are symmetrically arranged left and right relative to the axis of the back plate 4, the lower end of the first winding roller 33 is connected with a first motor 31, the lower end of the second winding roller 34 is connected with a second motor 32, one end of the writing plate 3 is fixedly connected with the first winding roller 33, the other end of the writing plate 3 is fixedly connected with the second winding roller 34, the writing plate 3 is attached to the front side of the back plate 4, the movement of the writing plate 3 is realized through the first motor 31 and the second motor 32, writing and wiping are convenient, the wiping mechanism 2 is in intermittent contact connection with the writing plate 3, the wiping mechanism 2 can wipe the writing content on the writing plate 3 according to the requirement, the base 5 is arranged below the casing 1, the center of the base 5 is provided with a first hydraulic cylinder 51, the first output end is fixedly connected with a rotary block 52, the rotary block 52 is fixedly arranged at the top of the base 5, the rotary block 52 is fixedly connected with the rotary block 14, the rotary block 14 is driven by the rotary block 52 is matched with the rotary block 14, and the rotary block 52 is driven by the rotary block 14, and the rotary block 52 is matched with the rotary block 14, and the rotary block is driven by the rotary block 52; the base 5 bottom is equipped with the lift groove 53, removes the setting of frame 6 in the lift groove 53, removes the frame 6 and is used for expanding when the device needs remove, and the device of being convenient for removes, and controller 7 sets up in base 5 top rear side, and controller 7 and first motor 31, second motor 32, first pneumatic cylinder 51, wiping mechanism 2 and remove frame 6 electric connection, controller 7 are controlled by remote controller 8, and the work of each motor and pneumatic cylinder is controlled through the program that sets for to controller 7, and remote controller 8 is used for sending the instruction of execution procedure for controller 7.
The wiping mechanism 2 comprises a rotating plate 21, a first driving rod 22, a first driving block 23, a second hydraulic cylinder 24, a wiping plate 25 and a wiping pad 26, wherein the top of the shell 1 is provided with a driving groove 12, the left side and the right side of the accommodating cavity 11 are respectively and fixedly connected with a fixed plate 13, one side of the rotating plate 21 is in rotating fit connection with the fixed plate 13, the other side of the rotating plate 21 is hinged with one end of the first driving rod 22, the second hydraulic cylinder 24 is fixedly connected at the rear side of the driving groove 12, the first driving block 23 is fixedly connected with the output end of the second hydraulic cylinder 24, the other end of the first driving rod 22 is in rotating fit connection with the first driving block 23, the inner side of the other end of the rotating plate 21 is fixedly connected with a connecting rod 211, the wiping plate 25 is fixedly connected with the connecting rod 211, the wiping pad 26 is detachably connected to the wiping plate 25, the wiping pad 26 is abutted to the writing plate 3, and the second hydraulic cylinder 24 is electrically connected with the controller 7; when the content written on the writing board 3 needs to be wiped, a wiping instruction on the remote controller 8 is pressed, the remote controller 8 is utilized to send the wiping instruction to the controller 7, then the controller 7 starts the second hydraulic cylinder 24, the second hydraulic cylinder 24 drives the first driving block 23 to be recovered backwards, the first driving rod 22 drives the rotating plate 21 to rotate inwards, the wiping pad 26 is abutted against the surface of the writing board 3, the first motor 31 and the second motor 32 are utilized to be matched with each other, the first winding roller 33 and the second winding roller 34 are driven to rotate, the writing board 3 is driven to move leftwards or rightwards to wipe the writing board 3, and the wiping instruction is pressed again, and the wiping pad 26 is separated from the writing board 3 and returns to the initial position under the action of the second hydraulic cylinder 24.
The length of the wiping board 25 and the wiping pad 26 is equal to the width of the writing board 3, and the wiping pad 26 is made of sponge or cloth, so that the writing board 3 can be wiped clean.
The left and right sides of the rotating block 52 are respectively provided with a third hydraulic cylinder 521, the output end of the third hydraulic cylinder 521 is fixedly connected with a second driving rod 522, the second driving rod 522 is respectively hinged with two sides of the rear end of the shell 1, the third hydraulic cylinder 521 is electrically connected with the controller 7, the shell 1 is rotated through the third hydraulic cylinder 521, further the angle rotation of the device is realized, and the training personnel can watch from a better angle conveniently.
The writing board 3 is made of flexible plastic, the width of the back board 4 is larger than that of the writing board 3, the two ends of the front side of the back board 4 are respectively provided with an arc surface 41, the writing board 3 is convenient to wind, and meanwhile, the writing board 3 is convenient to move more smoothly.
The moving frame 6 comprises a threaded rod 61, a second driving block 62, a third driving block 63, universal wheels 64, a third motor 65, a third driving rod 66, a clamping plate 67 and a rotating rod 68, wherein the third motor 65 is embedded in the right inner wall of the lifting groove 53, one end of the threaded rod 61 is fixedly connected with the output end of the third motor 65, the other end of the threaded rod 61 is in rotating fit connection with the left inner wall of the lifting groove 53, the clamping plates 67 are respectively fixedly connected on the left inner wall and the right inner wall of the lifting groove 53, the clamping plates 67 are arranged in a front-back symmetrical manner, the upper ends of the universal wheels 64 are in rotating fit connection with the clamping plates 67, the rotating rod 68 is in rotating fit connection with the middle part of the front-back universal wheels 64, the second driving block 62 and the third driving block 63 are respectively in threaded connection with the threaded rod 61, one end of the third driving rod 66 is connected with the rotating rod 68 in a rotating fit manner, the other end of the third driving rod 66 is respectively hinged with the second driving block 62 and the third driving block 63, the third motor 65 is electrically connected with the controller 7, when the device needs to be moved, the third motor 65 drives the threaded rod 61 to rotate, then drives the second driving block 62 and the third driving block 63 to move to two sides, further drives the rotating rod 68 to deflect downwards through the third driving rod 66, further drives the universal wheel 64 to deflect downwards until the universal wheel 64 leaks out of the lifting groove 53 and stands on the ground, further the device can be moved through the pushing device, and the universal wheel 64 can be retracted after the ideal position of the movement is reached, so that the device is stably placed on the ground through the base 5.
The second driving block 62 and the third driving block 63 have opposite spiral directions, so that the opposite movement of the second driving block 62 and the third driving block 63 is realized, and the same lifting and falling of the universal wheel 64 are realized.
Working principle: when the device is used, firstly, a moving button on the remote controller 8 is pressed, the controller 7 starts the third motor 65, the third motor 65 drives the threaded rod 61 to rotate, the second driving block 62 and the third driving block 63 are driven to move to two sides, the third driving rod 66 drives the rotating rod 68 to deflect downwards, the universal wheel 64 is driven to deflect downwards until the universal wheel 64 leaks out of the lifting groove 53 and stands on the ground, the device can be pushed to move, the moving button is pressed again after an ideal position to be moved, and the universal wheel 64 can be retracted, so that the device is stably placed on the ground through the base 5; then, when the angle of the device needs to be adjusted, a left-turn or right-turn button on the remote controller 8 can be pressed according to actual conditions, and then the controller 7 starts the third hydraulic cylinder 521, and through the mutual matching of the third hydraulic cylinders 521 on two sides of the rotating block 52, the second driving rod 522 is utilized to realize the rotation of the shell 1 around the rotating block 52, so that the angle rotation of the device is realized, and the device is adjusted to a required reasonable angle; then if the writing board 3 needs to be wiped, a wiping button on the remote controller 8 can be pressed down, a wiping command starts the second hydraulic cylinder 24 through the controller 7, the second hydraulic cylinder 24 drives the first driving block 23 to be recovered backwards, the rotating plate 21 is driven to rotate inwards through the first driving rod 22, the wiping pad 26 is abutted against the surface of the writing board 3, then the first winding roller 33 and the second winding roller 34 are driven to rotate by the mutual matching of the first motor 31 and the second motor 32, the writing board 3 is driven to move leftwards or rightwards, the wiping pad 26 abutted against the surface of the writing board 3 wipes the writing board 3, the wiping button is pressed down again, the wiping pad 26 is separated from the writing board 3 under the action of the second hydraulic cylinder 24 to return to the initial position, meanwhile, if no wiping is needed, only an excessive space is needed to write, the button can be pressed down on the remote controller 8, at this time, the controller 7 controls the mutual matching of the first motor 31 and the second motor 32 to drive the writing board 3 to move leftwards or rightwards, and if the writing board 3 is displayed for more writing board to be required to be unwound, and the blank writing board can be opened and the blank writing board can be controlled to be opened reversely; finally, if the height of the device needs to be adjusted, an ascending or descending button on the remote controller 8 can be pressed, the first hydraulic cylinder 51 is started through the controller 7, and the first hydraulic cylinder 51 drives the shell 1 to ascend or descend, so that the height adjustment of the device is realized.
Claims (3)
1. A teaching device for art training, its characterized in that: including casing (1), wiping mechanism (2), clipboard (3), backplate (4), base (5), remove frame (6), controller (7) and remote controller (8), casing (1) front side is equipped with holds chamber (11), wiping mechanism (2) set up hold chamber (11) left and right sides, backplate (4) fixed connection is in hold chamber (11) middle part, backplate (4) rear side is equipped with first winding roller (33) and second winding roller (34), first winding roller (33) with second winding roller (34) are with regard to backplate (4) axis bilateral symmetry sets up, first winding roller (33) lower extreme is connected with first motor (31), second winding roller (34) lower extreme is connected with second motor (32), clipboard (3) one end with first winding roller (33) fixed connection, clipboard (3) other end with second winding roller (34) fixed connection, board (3) laminating be in backplate (4) axis bilateral symmetry sets up with base (5) are in touch down in the setting of base (5), the utility model discloses a rotary table, including casing (1), first pneumatic cylinder (51) output fixedly connected with rotary block (52), rotary block (52) running fit is in rotary block (14), base (5) bottom is equipped with lift groove (53), remove frame (6) setting and be in lift groove (53), controller (7) set up base (5) top rear side, controller (7) with first motor (31), second motor (32), first pneumatic cylinder (51) wiping mechanism (2) with remove frame (6) electric connection, controller (7) are by remote controller (8) control, wiping mechanism (2) are including rotor plate (21), first actuating lever (22), first actuating block (23), second pneumatic cylinder (24), wiping plate (25) and wiping pad (26), drive slot (12) have been seted up at casing (1) top, left side (11) are held chamber (11) and are connected with fixed connection respectively rotor plate (21) and one side of rotary plate (13) are fixed connection, the second hydraulic cylinder (24) is fixedly connected to the rear side of the driving groove (12), the first driving block (23) is fixedly connected to the output end of the second hydraulic cylinder (24), the other end of the first driving rod (22) is connected with the first driving block (23) in a rotating fit manner, the connecting rod (211) is fixedly connected to the inner side of the other end of the rotating plate (21), the wiping plate (25) is fixedly connected with the connecting rod (211), the wiping pad (26) is detachably connected to the wiping plate (25), the wiping pad (26) is abutted to the writing board (3), the second hydraulic cylinder (24) is electrically connected with the controller (7), the left side and the right side of the rotating block (52) are respectively provided with a third hydraulic cylinder (521), the output end of the third hydraulic cylinder (521) is fixedly connected with a second driving rod (522), the second driving rod (522) is respectively hinged to the two sides of the rear end of the shell (1), the third hydraulic cylinder (521) is in butt joint with the writing board (3), the third driving rod (521) is electrically connected with the third driving rod (62), the third driving rod (64), the third driving rod (67) and the universal frame (67), the utility model provides a spiral drive device, including lifting groove (53) right side inner wall, threaded rod (61) one end with third motor (65) output fixed connection, threaded rod (61) other end with lifting groove (53) left side inner wall normal running fit is connected, grip block (67) fixed connection respectively be in on lifting groove (53) left and right sides inner wall, grip block (67) fore-and-aft symmetry sets up, universal wheel (64) upper end with grip block (67) normal running fit is connected, dwang (68) normal running fit is connected in fore-and-aft side universal wheel (64) middle part, second drive block (62) with third drive block (63) respectively with threaded rod (61) threaded connection, third drive rod (66) one end with dwang (68) normal running fit is connected, the third drive rod (66) other end respectively with second drive block (62) and third drive block (63) are articulated mutually, third drive block (65) with third drive block (63) opposite electric connection (62) spiral drive device (63).
2. A teaching device for artistic training according to claim 1 and characterized in that: the length of the wiping board (25) and the wiping pad (26) is equal to the width of the writing board (3), and the wiping pad (26) is made of sponge or cloth.
3. A teaching device for artistic training according to claim 1 and characterized in that: the writing board (3) is made of flexible plastic, the width of the back board (4) is larger than that of the writing board (3), and two ends of the front side of the back board (4) are respectively provided with an arc surface (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110503817.0A CN113183662B (en) | 2021-05-10 | 2021-05-10 | Teaching device for artistic training |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110503817.0A CN113183662B (en) | 2021-05-10 | 2021-05-10 | Teaching device for artistic training |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113183662A CN113183662A (en) | 2021-07-30 |
| CN113183662B true CN113183662B (en) | 2024-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110503817.0A Active CN113183662B (en) | 2021-05-10 | 2021-05-10 | Teaching device for artistic training |
Country Status (1)
| Country | Link |
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| CN (1) | CN113183662B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114129003A (en) * | 2021-11-06 | 2022-03-04 | 徐州工业职业技术学院 | Teaching board convenient to use |
| CN114176341B (en) * | 2021-11-25 | 2023-07-07 | 广东味福记科技股份有限公司 | But environmental protection cyclic utilization's medical information display device |
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| CN211031918U (en) * | 2019-12-05 | 2020-07-17 | 李天喜 | Primary school's chinese teaching auxiliary device |
| CN211878770U (en) * | 2020-03-17 | 2020-11-06 | 饶崴 | Tool for human resource training |
| CN111391546A (en) * | 2020-03-30 | 2020-07-10 | 深圳华文网教育科技有限公司 | Intelligent teaching auxiliary equipment |
| CN112622492A (en) * | 2020-12-31 | 2021-04-09 | 阜阳佳派生产力促进中心有限公司 | Flexible writing board for meeting room |
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