CN113077703A - Phantom imaging intelligent sand table - Google Patents

Phantom imaging intelligent sand table Download PDF

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Publication number
CN113077703A
CN113077703A CN202110404059.7A CN202110404059A CN113077703A CN 113077703 A CN113077703 A CN 113077703A CN 202110404059 A CN202110404059 A CN 202110404059A CN 113077703 A CN113077703 A CN 113077703A
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CN
China
Prior art keywords
sand table
plate
transverse
intelligent
mounting
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Pending
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CN202110404059.7A
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Chinese (zh)
Inventor
孙颖
高强
李坤
宋光杰
王立美
张延庆
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Wujiang Culture Technology Group Co ltd
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Wujiang Culture Technology Group Co ltd
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Priority to CN202110404059.7A priority Critical patent/CN113077703A/en
Publication of CN113077703A publication Critical patent/CN113077703A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B25/00Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00Advertising or display means not otherwise provided for
    • G09F19/12Advertising or display means not otherwise provided for using special optical effects
    • G09F19/18Advertising or display means not otherwise provided for using special optical effects involving the use of optical projection means, e.g. projection of images on clouds

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  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Accounting & Taxation (AREA)
  • Marketing (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • Projection Apparatus (AREA)

Abstract

The invention belongs to the technical field of intelligent sand tables, and particularly relates to an intelligent phantom imaging sand table which aims at solving the problems that in the prior art, phantom imaging can only be fixedly arranged, and cannot be rotated or lifted, so that different angles and heights are inconvenient to show and the showing effect is influenced. According to the sand table, the sand table body is driven to rotate and simultaneously reciprocate up and down, so that the sand table body can be comprehensively and efficiently displayed at different heights and different angles, and the display efficiency and the display effect are improved.

Description

Phantom imaging intelligent sand table
Technical Field
The invention relates to the technical field of intelligent sand tables, in particular to a phantom imaging intelligent sand table.
Background
At present, the popularization rate of the model sand table is extremely high, but the sand table as an original display means is increasingly influenced by the defects of small information quantity, incomplete detail, weak field experience and the like. The phantom imaging has high artistic value and wide application prospect as an emerging technology. Through retrieval, chinese patent with publication number CN201910191U discloses a phantom imaging intelligent interactive sand table, which comprises: the model sand table is used for displaying the basic situation of the building in the sand table; the surrounding multi-point touch screen surrounds the model sand table area and is used for displaying information of more detailed contents in the model sand table; and the display screen is hung above the model sand table and is used for displaying content information selected by the multi-point touch screen operator through the surrounding multi-point touch screen.
However, the design has the defects that the sand table in the design is fixedly arranged and cannot rotate or lift, so that different angles and heights are inconvenient to show, and the showing effect is influenced, and therefore the phantom imaging intelligent sand table is provided for solving the problems.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, the phantom imaging intelligent sand table is only fixedly arranged and cannot rotate or lift, so that the exhibition at different angles and heights is inconvenient to carry out and the exhibition effect is influenced.
In order to achieve the purpose, the invention adopts the following technical scheme:
an intelligent phantom imaging sand table comprises a bottom frame, a sand table body, a display screen and an inverted rectangular pyramid holographic imaging curtain, wherein the display screen and the inverted rectangular pyramid holographic imaging curtain are hung above the sand table body, four projectors are fixedly installed at the top of the display screen, an installation plate is fixedly installed at the bottom of the sand table body, an installation shaft is fixedly installed at the bottom of the installation plate, a transverse plate is slidably installed in the bottom frame, a circular hole is formed in the top of the transverse plate, the installation shaft is rotatably connected in the circular hole, an installation groove and two sliding grooves are formed in the bottom of the transverse plate, a motor is fixedly installed on the inner wall of the top of the installation groove, a worm is fixedly installed on an output shaft of the motor, a first gear is fixedly installed on the worm, a second gear is fixedly installed at the bottom of the installation shaft, the first gear is meshed with the second, two worm wheels are rotatably mounted on the front side of the fixed plate, the two worm wheels are all meshed with a worm, a round rod is fixedly mounted on the front side of each worm wheel, a cylinder is rotatably sleeved on the outer side of the round rod, a sliding plate is slidably mounted in the sliding groove, a transverse rod is fixedly mounted on one side, close to each other, of each sliding plate, a push plate is fixedly mounted on one end, close to each other, of each transverse rod, the two cylinders are respectively in rolling connection with one side of the corresponding push plate, a transverse groove is formed in one side of each sliding plate, a vertical plate is slidably mounted in the transverse groove, a linkage rod is fixedly mounted on one side, far away from each other, of each vertical plate, a side plate is fixedly mounted on one end, far away from each linkage rod, a first connecting rod and a second connecting rod are rotatably connected to one side, the top end of the first connecting rod is fixedly connected with the bottom of, the equal fixedly connected with reset spring in one side that two slides kept away from each other, the one end that two reset springs kept away from each other respectively with the one side inner wall fixed connection of the spout that corresponds.
Preferably, the bottom fixedly connected with a plurality of supporting spring of diaphragm, a plurality of supporting spring's bottom all with the bottom inner wall fixed connection of underframe, carry out the auxiliary stay to the diaphragm.
Preferably, two guide rods are fixedly mounted on the inner wall of the bottom frame, two guide cylinders are fixedly mounted at the bottom of the transverse plate, and the two guide cylinders are respectively sleeved on the outer sides of the corresponding guide rods in a sliding mode to guide the transverse plate.
Preferably, the bottom fixed mounting of mounting panel has a plurality of supports, and the gyro wheel is installed to the support internal rotation, and the gyro wheel is connected with the top roll of diaphragm, supports and reduces the rotation resistance to the mounting panel.
Preferably, the same limiting rod is fixedly connected to the inner walls of the two sides of the sliding groove, and the two sliding plates are respectively sleeved on the outer sides of the corresponding limiting rods in a sliding mode to guide and limit the sliding plates.
Preferably, one side of the round rod is fixedly provided with a baffle, and the two baffles are respectively movably abutted against the front side of the corresponding cylinder to limit the forward and backward movement of the cylinder.
Preferably, the same montant of fixedly connected with on the top inner wall of transverse groove and the bottom inner wall, two risers slide respectively to cup joint in the outside of the montant that corresponds, and it is spacing to lead to the riser.
Preferably, the top fixedly connected with connecting spring of riser, two connecting spring's top respectively with the top inner wall fixed connection of the transverse groove that corresponds, reset the riser.
In the intelligent ghost imaging sand table, video images projected by four projectors are converged into a holographic image after a series of optical diffraction in a rectangular pyramid holographic imaging screen, the holographic image looks like a real object floating in the air, and by starting a motor, an output shaft of the motor drives a worm to rotate, the worm drives a first gear to rotate, the first gear drives a second gear to rotate at a slow speed, the second gear drives a mounting plate to rotate through a mounting shaft, and the mounting plate drives a sand table body to rotate, so that different angles of display are performed;
in the invention, the two worm wheels are driven to rotate while the worm rotates, the two worm wheels respectively drive the corresponding round rods and the corresponding cylinders to do circular motion, the two cylinders respectively push the two push plates to move towards the sides far away from each other by abutting against the corresponding push plates, the two push plates respectively drive the two sliding plates to move towards the sides far away from each other by the corresponding cross rods and compress the reset springs, the two sliding plates drive the two vertical plates to move towards the sides far away from each other, the two vertical plates respectively drive the two side plates to move towards the sides far away from each other by the corresponding linkage rods, the two side plates respectively drive the corresponding first connecting rods and second connecting rods to rotate, so that the included angle between the first connecting rods and the second connecting rods positioned at the same side is increased, the transverse plates are driven to move upwards, and the mounting plates and the sand table body are driven to move upwards by the mounting shafts, after the worm wheel rotates by a certain angle, the sliding plate can reset under the elastic force of the reset spring and drive the transverse plate to move downwards, and the worm wheel continuously rotates to drive the sand table body to reciprocate up and down, so that the sand table body can be comprehensively and efficiently displayed at different heights and different angles, and the display efficiency and the display effect are improved;
the sand table is reasonable in structural design, the sand table body is driven to rotate and reciprocate up and down, so that the sand table body can be displayed comprehensively and efficiently at different heights and different angles, the display efficiency and the display effect are improved, and the reliability is high.
Drawings
Fig. 1 is a schematic structural diagram of an intelligent phantom imaging sand table according to the present invention;
FIG. 2 is a schematic structural diagram of part A of an intelligent phantom imaging sand table provided by the invention;
FIG. 3 is a schematic structural diagram of part B of an intelligent phantom imaging sand table provided by the invention;
FIG. 4 is a schematic structural diagram of a part C of an intelligent phantom imaging sand table provided by the invention;
fig. 5 is a schematic structural diagram of a part D of an intelligent phantom imaging sand table according to the invention.
In the figure: 1. a bottom frame; 2. a sand table body; 3. displaying a screen; 4. a rectangular pyramid holographic imaging screen; 5. a cylinder; 6. a projector; 7. mounting a plate; 8. a transverse plate; 9. a motor; 10. a worm; 11. a first gear; 12. a second gear; 13. installing a shaft; 14. a fixing plate; 15. a worm gear; 16. a round bar; 17. a baffle plate; 18. pushing the plate; 19. a cross bar; 20. a slide plate; 21. a chute; 22. a return spring; 23. a limiting rod; 24. a connecting spring; 25. a transverse slot; 26. a vertical rod; 27. a vertical plate; 28. a linkage rod; 29. a side plate; 30. a support spring; 31. a first connecting rod; 32. a second connecting rod; 33. a guide cylinder; 34. a guide bar; 35. and a roller.
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. 1-5, an intelligent ghost imaging sand table comprises a bottom frame 1, a sand table body 2, a display screen 3 and an inverted rectangular pyramid holographic imaging curtain 4, wherein the display screen 3 and the inverted rectangular pyramid holographic imaging curtain 4 are suspended above the sand table body 2, four projectors 6 are fixedly installed at the top of the display screen 3, an installation plate 7 is fixedly installed at the bottom of the sand table body 2, an installation shaft 13 is fixedly installed at the bottom of the installation plate 7, a transverse plate 8 is slidably installed in the bottom frame 1, a circular hole is formed at the top of the transverse plate 8, the installation shaft 13 is rotatably connected in the circular hole, an installation groove and two chutes 21 are formed at the bottom of the transverse plate 8, a motor 9 is fixedly installed on the inner wall of the top of the installation groove, a worm 10 is fixedly installed on an output shaft of the motor 9, a first gear 11 is fixedly installed on the worm 10, the first gear 11 is meshed with the second gear 12, the bottom of the transverse plate 8 is fixedly provided with a fixed plate 14, the front side of the fixed plate 14 is rotatably provided with two worm wheels 15, the two worm wheels 15 are both meshed with the worm 10, the front side of each worm wheel 15 is fixedly provided with a round rod 16, the outer side of each round rod 16 is rotatably sleeved with a cylinder 5, a sliding groove 21 is internally provided with a sliding plate 20 in a sliding manner, one side of each sliding plate 20 close to each other is fixedly provided with a transverse rod 19, one end of each transverse rod 19 close to each other is fixedly provided with a push plate 18, the two cylinders 5 are respectively in rolling connection with one side of the corresponding push plate 18, one side of each sliding plate 20 is provided with a transverse groove 25, a vertical plate 27 is internally provided with a sliding manner, one side of each vertical plate 27 far away from each other is fixedly provided with a linkage rod 28, one end of each linkage rod 28 far away from each other is fixedly provided with a, the top of first connecting rod 31 passes through the hinge and links the bottom fixed connection of diaphragm 8, and the bottom of second connecting rod 32 passes through the hinge and is connected with the bottom inner wall rotation of underframe 1, and the equal fixedly connected with reset spring 22 in one side that two slides 20 kept away from each other, the one end that two reset spring 22 kept away from each other respectively with the one side inner wall fixed connection of the spout 21 that corresponds.
In this embodiment, a plurality of supporting springs 30 of bottom fixedly connected with of diaphragm 8, a plurality of supporting springs 30's bottom all with the bottom inner wall fixed connection of underframe 1, carry out auxiliary stay to diaphragm 8.
In this embodiment, fixed mounting has two guide bars 34 on the bottom inner wall of underframe 1, and the bottom fixed mounting of diaphragm 8 has two guide cylinders 33, and two guide cylinders 33 slide respectively and cup joint in the outside of the guide bar 34 that corresponds, lead to diaphragm 8.
In this embodiment, the bottom fixed mounting of mounting panel 7 has a plurality of supports, and the gyro wheel 35 is installed to the support internal rotation, and gyro wheel 35 and diaphragm 8's top roll connection support mounting panel 7 and reduce the rotation resistance.
In this embodiment, the same limiting rod 23 is fixedly connected to the inner walls of the two sides of the sliding groove 21, and the two sliding plates 20 are respectively slidably sleeved on the outer sides of the corresponding limiting rods 23 to guide and limit the sliding plates 20.
In this embodiment, a baffle 17 is fixedly mounted on one side of the round bar 16, and the two baffles 17 are respectively movably abutted against the front side of the corresponding cylinder 5 to limit the forward and backward movement of the cylinder 5.
In this embodiment, the same montant 26 of fixedly connected with on the top inner wall of transverse groove 25 and the bottom inner wall, two risers 27 slide respectively and cup joint in the outside of the montant 26 that corresponds, and it is spacing to lead to riser 27.
In this embodiment, the top fixedly connected with connecting spring 24 of riser 27, the top of two connecting spring 24 respectively with the top inner wall fixed connection of corresponding transverse groove 25, reset riser 27.
In this embodiment, when in use, the video images projected by the four projectors 6 are converged into a holographic image after a series of optical diffractions in the rectangular pyramid holographic imaging screen 4, which looks like an object floating in the air, and the motor 9 is started, the output shaft of the motor 9 drives the worm 10 to rotate, the worm 10 drives the first gear 11 to rotate, the first gear 11 drives the second gear 12 to rotate at a slow speed, the second gear 12 drives the mounting plate 7 to rotate through the mounting shaft 13, the mounting plate 7 drives the sand table body 2 to rotate, so as to display different angles, the worm 10 drives the two worm wheels 15 to rotate while rotating, the two worm wheels 15 respectively drive the corresponding round bars 16 and the cylinders 5 to do circular motion, the two cylinders 5 respectively push the two push plates 18 to move to the sides far away from each other by abutting against the corresponding push plates 18, the two push plates 18 respectively drive the two sliding plates 20 to move to the sides far away from each other through the corresponding cross bars 19 The reset spring 22 is compressed, the two sliding plates 20 drive the two vertical plates 27 to move towards one side away from each other, the two vertical plates 27 respectively drive the two side plates 29 to move towards one side away from each other through the corresponding linkage rods 28, the two side plates 29 respectively drive the corresponding first connecting rods 31 and second connecting rods 32 to rotate, so that the included angles between the first connecting rods 31 and the second connecting rods 32 positioned at the same side are increased, the transverse plate 8 is driven to move upwards, the transverse plate 8 drives the mounting plate 7 and the sand table body 2 to move upwards through the mounting shaft 13, so that the displaying at different heights can be performed, and after the worm wheel 15 rotates a certain angle, the sliding plates 20 can reset under the elastic force of the reset spring 22 and drive the transverse plate 8 to move downwards, the worm wheel 15 continuously rotates, so that the sand table body 2 is driven to reciprocate upwards and downwards, so that the displaying at different heights and different angles of the sand table body 2 can be performed comprehensively and, the display efficiency and the display effect are improved.

Claims (8)

1. An intelligent phantom imaging sand table comprises a bottom frame (1), a sand table body (2), a display screen (3) and an inverted rectangular pyramid holographic imaging curtain (4), and is characterized in that the display screen (3) and the inverted rectangular pyramid holographic imaging curtain (4) are suspended above the sand table body (2), four projectors (6) are fixedly mounted at the top of the display screen (3), a mounting plate (7) is fixedly mounted at the bottom of the sand table body (2), a mounting shaft (13) is fixedly mounted at the bottom of the mounting plate (7), a transverse plate (8) is slidably mounted in the bottom frame (1), a circular hole is formed at the top of the transverse plate (8), the mounting shaft (13) is rotatably connected in the circular hole, a mounting groove and two sliding grooves (21) are formed at the bottom of the transverse plate (8), a motor (9) is fixedly mounted on the inner wall of the top of the mounting groove, and a worm (10) is fixedly mounted on an output shaft of the, the worm (10) is fixedly provided with a first gear (11), the bottom end of the installation shaft (13) is fixedly provided with a second gear (12), the first gear (11) is meshed with the second gear (12), the bottom of the transverse plate (8) is fixedly provided with a fixed plate (14), the front side of the fixed plate (14) is rotatably provided with two worm wheels (15), the two worm wheels (15) are both meshed with the worm (10), the front side of each worm wheel (15) is fixedly provided with a round rod (16), the outer side of each round rod (16) is rotatably sleeved with a cylinder (5), a sliding plate (20) is slidably arranged in the sliding groove (21), one side of each sliding plate (20) close to each other is fixedly provided with a transverse rod (19), one end of each transverse rod (19) close to each other is fixedly provided with a push plate (18), and the two cylinders (5) are respectively in rolling connection with one side of the corresponding push plate (, and transverse groove (25) have been seted up to one side of slide (20), slidable mounting has riser (27) in transverse groove (25), the equal fixed mounting in one side that two risers (27) kept away from each other has gangbar (28), the equal fixed mounting in one end that two gangbar (28) kept away from each other has curb plate (29), the one side that two curb plate (29) kept away from each other all is connected with head rod (31) and second connecting rod (32) through the hinge rotation, the bottom fixed connection of hinge and continuous diaphragm (8) is passed through on the top of head rod (31), the bottom of second connecting rod (32) is passed through the hinge and is connected with the bottom inner wall rotation of underframe (1), the equal fixed connection in one side that two slides (20) kept away from each other has reset spring (22), the one end that two reset spring (22) kept away from each other respectively with the one side inner wall fixed connection of corresponding spout (.
2. The intelligent ghost image imaging sand table according to claim 1, wherein a plurality of supporting springs (30) are fixedly connected to the bottom of the transverse plate (8), and the bottom ends of the supporting springs (30) are fixedly connected to the inner wall of the bottom frame (1).
3. The intelligent phantom imaging sand table according to claim 1, wherein two guide rods (34) are fixedly arranged on the inner wall of the bottom frame (1), two guide cylinders (33) are fixedly arranged at the bottom of the transverse plate (8), and the two guide cylinders (33) are respectively sleeved on the outer sides of the corresponding guide rods (34) in a sliding manner.
4. A phantom imaging intelligent sand table according to claim 1, wherein a plurality of brackets are fixedly arranged at the bottom of the mounting plate (7), rollers (35) are rotatably arranged in the brackets, and the rollers (35) are in rolling connection with the top of the transverse plate (8).
5. The intelligent phantom imaging sand table according to claim 1, wherein the inner walls of the two sides of the sliding chute (21) are fixedly connected with the same limiting rod (23), and the two sliding plates (20) are respectively sleeved on the outer sides of the corresponding limiting rods (23) in a sliding manner.
6. A phantom imaging intelligent sand table according to claim 1, characterized in that a baffle (17) is fixedly mounted on one side of the round bar (16), and the two baffles (17) are movably abutted with the front side of the corresponding cylinder (5) respectively.
7. The intelligent sand table for phantom imaging according to claim 1, wherein the top inner wall and the bottom inner wall of the transverse groove (25) are fixedly connected with a same vertical rod (26), and two vertical plates (27) are respectively sleeved on the outer sides of the corresponding vertical rods (26) in a sliding manner.
8. A phantom imaging intelligent sand table according to claim 1, wherein the top of the vertical plate (27) is fixedly connected with a connecting spring (24), and the top ends of the two connecting springs (24) are respectively fixedly connected with the top inner wall of the corresponding transverse groove (25).
CN202110404059.7A 2021-04-15 2021-04-15 Phantom imaging intelligent sand table Pending CN113077703A (en)

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CN202110404059.7A CN113077703A (en) 2021-04-15 2021-04-15 Phantom imaging intelligent sand table

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Application Number Priority Date Filing Date Title
CN202110404059.7A CN113077703A (en) 2021-04-15 2021-04-15 Phantom imaging intelligent sand table

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Publication number Priority date Publication date Assignee Title
KR100679991B1 (en) * 2006-03-27 2007-02-08 계양전기 주식회사 A wall-hanging device of flat panel display unit
CN201910191U (en) * 2010-01-26 2011-07-27 北京水晶石数字科技股份有限公司 Phantom-imaging intelligent interactive sand table
CN108230873A (en) * 2018-03-15 2018-06-29 周珏伟 A kind of rotatable building sand table externally shown for sales office
CN207704825U (en) * 2018-01-12 2018-08-07 上海合狐信息科技有限公司 A kind of spliced exhibitions translation deduction plate
CN207733947U (en) * 2017-06-30 2018-08-17 天津博创企惠科技有限公司 A kind of adjustable showcase
CN209895584U (en) * 2019-03-21 2020-01-03 杭州学两手网络科技有限公司 Teaching information show board for internet education
CN209912242U (en) * 2019-04-08 2020-01-07 东营职业学院 Teaching is with show board convenient to remove
CN210324906U (en) * 2019-09-24 2020-04-14 龚光军 CAD3D three-dimensional model display device
CN211582389U (en) * 2020-01-02 2020-09-29 江苏尚典展示展览有限公司 Exhibition cabinet with adjustable display height
CN111768708A (en) * 2020-07-15 2020-10-13 潍坊科技学院 Display device for displaying legal cases
CN212243828U (en) * 2020-06-02 2020-12-29 桂林电子科技大学 A unmanned aerial vehicle device for monitoring crops growth
CN212394465U (en) * 2020-05-07 2021-01-26 南京林业大学 Exhibition device for exhibition of design
CN212411443U (en) * 2020-05-30 2021-01-26 王艺凤 Building planning design sand table with good display effect
CN212460953U (en) * 2020-06-29 2021-02-02 长沙飞阳展示展览有限公司 Multi-angle sand table display stand

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100679991B1 (en) * 2006-03-27 2007-02-08 계양전기 주식회사 A wall-hanging device of flat panel display unit
CN201910191U (en) * 2010-01-26 2011-07-27 北京水晶石数字科技股份有限公司 Phantom-imaging intelligent interactive sand table
CN207733947U (en) * 2017-06-30 2018-08-17 天津博创企惠科技有限公司 A kind of adjustable showcase
CN207704825U (en) * 2018-01-12 2018-08-07 上海合狐信息科技有限公司 A kind of spliced exhibitions translation deduction plate
CN108230873A (en) * 2018-03-15 2018-06-29 周珏伟 A kind of rotatable building sand table externally shown for sales office
CN209895584U (en) * 2019-03-21 2020-01-03 杭州学两手网络科技有限公司 Teaching information show board for internet education
CN209912242U (en) * 2019-04-08 2020-01-07 东营职业学院 Teaching is with show board convenient to remove
CN210324906U (en) * 2019-09-24 2020-04-14 龚光军 CAD3D three-dimensional model display device
CN211582389U (en) * 2020-01-02 2020-09-29 江苏尚典展示展览有限公司 Exhibition cabinet with adjustable display height
CN212394465U (en) * 2020-05-07 2021-01-26 南京林业大学 Exhibition device for exhibition of design
CN212411443U (en) * 2020-05-30 2021-01-26 王艺凤 Building planning design sand table with good display effect
CN212243828U (en) * 2020-06-02 2020-12-29 桂林电子科技大学 A unmanned aerial vehicle device for monitoring crops growth
CN212460953U (en) * 2020-06-29 2021-02-02 长沙飞阳展示展览有限公司 Multi-angle sand table display stand
CN111768708A (en) * 2020-07-15 2020-10-13 潍坊科技学院 Display device for displaying legal cases

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Application publication date: 20210706