CN209560742U - A kind of sin cos functions two-dimensional projection apparatus for demonstrating - Google Patents
A kind of sin cos functions two-dimensional projection apparatus for demonstrating Download PDFInfo
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- CN209560742U CN209560742U CN201822247331.1U CN201822247331U CN209560742U CN 209560742 U CN209560742 U CN 209560742U CN 201822247331 U CN201822247331 U CN 201822247331U CN 209560742 U CN209560742 U CN 209560742U
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Abstract
The utility model discloses a kind of sin cos functions two-dimensional projection apparatus for demonstrating, including demonstration box, left and right adjusting device is equipped on front side of the upper end of demonstration box, the upper end of supporting block is equipped with electric expansion column in left and right adjusting device, at the top of the telescopic end of electric expansion column be fixedly connected at the bottom center of disk, the upper end of disk is equipped with level angle regulating device, the sin cos functions two-dimensional projection apparatus for demonstrating, structure is simple, it is easy to operate, projection demonstration is intuitive and easy to understand, the study of teaching and student to teacher brings great convenience, and it being capable of demand as needed, pass through left and right adjusting device, level angle regulating device and inclination angle regulator, which are realized, adjusts the omnibearing angel of project content, it is grasped convenient for accurate exhaustive of each orientation student to knowledge point, alleviate the teaching load of teacher, it ensure that quality of instruction , improve the service efficiency of projection demonstration device.
Description
Technical field
The utility model relates to teaching equipment technical field, specially a kind of sin cos functions two-dimensional projection apparatus for demonstrating.
Background technique
In the teaching process of Mathematics Curriculum, the knowledge architectures such as sin cos functions need teacher to explain student, but due to
It draws complicated various, explanation difficulty is larger, needs special picture and text demonstration aided education, but traditional projection demonstration device, deposits
In such as problem, structure is complicated, inconvenient, and projection demonstration is not intuitive and easy to understand enough, can not be excessively to teacher's written contents and figure
Text display content projection shows that the study of teaching and student to teacher brings great trouble, and can not be according to need
It wants demand to realize to adjust the omnibearing angel of project content, each orientation student can not be accomplished to the accurate exhaustive of knowledge point
It grasps, virtually increases the teaching load of teacher, quality of instruction is difficult to obtain control, and the use of projection demonstration device is caused to imitate
Rate is low, therefore the realization for being able to solve a kind of sin cos functions two-dimensional projection apparatus for demonstrating of problems is imperative.
Utility model content
The technical problems to be solved in the utility model is to overcome existing defect, provides a kind of sin cos functions two-dimensional projection
Apparatus for demonstrating, structure is simple, easy to operate, and projection demonstration is intuitive and easy to understand, and the study of teaching and student to teacher brings pole
Big convenience, and can demand as needed, pass through left and right adjusting device, level angle regulating device and tilt angle adjust
Device, which is realized, adjusts the omnibearing angel of project content, grasps convenient for accurate exhaustive of each orientation student to knowledge point,
The teaching load for alleviating teacher, ensure that quality of instruction, improve the service efficiency of projection demonstration device, can effectively solve
The problems in background technique.
To achieve the above object, the utility model provides the following technical solutions: a kind of sin cos functions two-dimensional projection demonstration
The upper end front side of device, including demonstration box, the demonstration box is equipped with left and right adjusting device, and supporting block is upper in left and right adjusting device
End is equipped with electric expansion column, at the top of the telescopic end of electric expansion column be fixedly connected at the bottom center of disk, the upper end of disk
Equipped with level angle regulating device, it is equipped with inclination angle regulator on front side of the upper end of level angle regulating device turntable, is inclined
The front end of connecting plate is equipped with electric curtain in rake angle regulating device, and curved bar is equipped at the front side upper end center of electric curtain, bent
The front end of bar is equipped with projector, and projector is correspondingly arranged with electric curtain, and side is equipped with from left to right on rear side of the upper end of demonstration box
PLC controller, display screen and show stand, the upper center of demonstration box are equipped with elastic rod, and the top of elastic rod is equipped with high photographing instrument, drills
Show that bottom end is equipped with battery, the input terminal of the output end electrical connection PLC controller of battery, electric expansion column, electricity in the case of case
The input terminal for moving curtain, projector, display screen and high photographing instrument is electrically connected the output end of PLC controller.
As a kind of optimal technical scheme of the utility model, the left and right adjusting device includes concave-board, the demonstration
Concave-board is equipped on front side of the upper end of case, the slot inner wall of concave-board is rotatablely connected by the both ends of bearing and screw rod, the middle part of screw rod
It is threadedly coupled with the threaded upper ends hole of supporting block, the rear side of supporting block is equipped with sliding block, sliding in the slot internal chute of sliding block and concave-board
Dynamic connection, the side of concave-board are equipped with first servo motor, and the output shaft of first servo motor passes through the side through-hole of concave-board
And it is fixedly connected by shaft coupling with one end of screw rod, the output end of the input terminal electrical connection PLC controller of first servo motor.
As a kind of optimal technical scheme of the utility model, the level angle regulating device includes plane bearing, institute
It states and is equipped with plane bearing on front side of the upper end of disk, the upper end of plane bearing is rotatably connected to turntable, and the cambered surface of turntable is equipped with tooth
Slot, is equipped with the second servo motor on rear side of the upper end of disk, and the upper end output shaft top of the second servo motor is equipped with gear, gear with
Tooth socket engagement connection, the output end of the input terminal electrical connection PLC controller of the second servo motor.
As a kind of optimal technical scheme of the utility model, the inclination angle regulator includes connection frame, described
It is fixedly connected on front side of the bottom surface of connection frame and the upper end of turntable, the inner sidewall of connection frame is rotated by the both ends of bearing and shaft to be connected
It connects, the cambered surface of shaft is fixedly connected with the rear end of connecting plate, and the side of connection frame is equipped with third servo motor, third servo motor
Output shaft pass through connecting plate side through-hole and be fixedly connected by shaft coupling with one end of shaft, third servo motor it is defeated
Enter the output end of end electrical connection PLC controller.
As a kind of optimal technical scheme of the utility model, the front side of the demonstration box is equipped with clipboard, demonstration box
Bottom surface quadrangle is equipped with universal wheel, and the right side of demonstration box is equipped with push rod, and middle part is equipped with supporting plate, the rear side of demonstration box in the case of demonstration box
Opening side is hinged with gear door, and bottom end is equipped with equally distributed iron plate on front side of the curtain of electric curtain.
Compared with prior art, the utility model has the beneficial effects that this sin cos functions two-dimensional projection apparatus for demonstrating, knot
Structure is simple, and by the regulation of PLC controller, high photographing instrument is opened up the content of courses that teacher on show stand writes or on display screen
The graph-text content shown is captured, and through projector on electric curtain, projection demonstration is intuitive and easy to understand, to the teaching and of teacher
Raw study brings great convenience, and can demand as needed, first servo motor operating, output shaft rotation drive
Screw rod rotation, since the middle part of screw rod is threadedly coupled with the threaded upper ends hole of supporting block, the slot internal chute of sliding block and concave-board is sliding
Dynamic connection realizes that the left-right position of supporting block and top device is adjusted, and electric expansion column is flexible, realizes the adjusting of demonstration height,
The operating of second servo motor, the rotation of output shaft rotation driven gear, since gear engages connection with tooth socket, turntable is in plane bearing
Upper rotation connection realizes and adjusts in the demonstration of level angle that third servo motor operating, output shaft rotation drives shaft connecting
It is rotated in frame, and then realizes the adjusting of demonstration tilt angle, to reach the omnibearing angel adjusting to project content, convenient for every
A orientation student grasps the accurate exhaustive of knowledge point, alleviates the teaching load of teacher, ensure that quality of instruction, improves
The service efficiency of projection demonstration device.
Detailed description of the invention
Fig. 1 is the utility model structure front schematic view；
Fig. 2 is the utility model texture edge schematic diagram；
Fig. 3 is the utility model structure left and right adjusting device internal sectional schematic diagram；
Fig. 4 is the utility model structure level angle adjustment device internal sectional schematic diagram.
In figure: 1 demonstration box, 2 left and right adjusting devices, 21 concave-boards, 22 screw rods, 23 supporting blocks, 24 first servo motors, 25
Sliding block, 3 disks, 4 level angle regulating devices, 41 plane bearings, 42 turntables, 43 tooth sockets, 44 second servo motors, 45 gears, 5
Inclination angle regulator, 51 connection frames, 52 shafts, 53 third servo motors, 54 connecting plates, 6 electric curtains, 7 curved bars, 8 are thrown
It is shadow instrument, 9 PLC controllers, 10 display screens, 11 show stands, 12 elastic rods, 13 high photographing instruments, 14 iron plates, 15 clipboards, 16 universal
Wheel, 17 push rods, 18 batteries, 19 supporting plates, 20 electric expansion columns, 30 gear doors.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Fig. 1-4 is please referred to, the utility model provides a kind of technical solution: a kind of sin cos functions two-dimensional projection demonstration dress
It sets, including demonstration box 1, demonstration box 1 provides demo platform, and left and right adjusting device 2 is equipped on front side of the upper end of demonstration box 1, and left and right is adjusted
Regulating device 2 includes concave-board 21, is equipped with concave-board 21 on front side of the upper end of demonstration box 1, the slot inner wall of concave-board 21 by bearing with
The both ends of screw rod 22 are rotatablely connected, and the middle part of screw rod 22 is threadedly coupled with the threaded upper ends hole of supporting block 23, after supporting block 23
Side is equipped with sliding block 25, is slidably connected in sliding block 25 and the slot internal chute of concave-board 21, and the side of concave-board 21 is equipped with the first servo
Motor 24, the output shaft of first servo motor 24 pass through the side through-hole of concave-board 21 and pass through one end of shaft coupling and screw rod 22
It is fixedly connected, first servo motor 24 operates, and output shaft rotation drives screw rod 22 to rotate, middle part and supporting block due to screw rod 22
23 threaded upper ends hole is threadedly coupled, and is slidably connected in sliding block 25 and the slot internal chute of concave-board 21, realization supporting block 23 and on
The left-right position of square device is adjusted, and the upper end of supporting block 23 is equipped with electric expansion column 20, electric expansion column in left and right adjusting device 2
20 is flexible, realizes the adjusting of demonstration height, connects at the top of the telescopic end of electric expansion column 20 with fixed at the bottom center of disk 3
Connect, the upper end of disk 3 is equipped with level angle regulating device 4, and level angle regulating device 4 includes plane bearing 41, disk 3 it is upper
End front side is equipped with plane bearing 41, and the upper end of plane bearing 41 is rotatably connected to turntable 42, and the cambered surface of turntable 42 is equipped with tooth socket
43, the upper end rear side of disk 3 is equipped with the second servo motor 44, and the upper end output shaft top of the second servo motor 44 is equipped with gear
45, gear 45 engages connection with tooth socket 43, and the operating of the second servo motor 44, output shaft rotation driven gear 45 rotates, due to tooth
Wheel 45 engages connection with tooth socket 43, and turntable 42 is rotatablely connected on plane bearing 41, realizes and adjusts in the demonstration of level angle, water
Inclination angle regulator 5 is equipped on front side of the upper end of flat 4 turntable 42 of angle adjustment device, inclination angle regulator 5 includes
Be fixedly connected on front side of the upper end of connection frame 51, the bottom surface of connection frame 51 and turntable 42, the inner sidewall of connection frame 51 by bearing with
The both ends of shaft 52 are rotatablely connected, and the cambered surface of shaft 52 is fixedly connected with the rear end of connecting plate 54, and the side of connection frame 51 is equipped with
Third servo motor 53, the output shaft of third servo motor 53 pass through the side through-hole of connecting plate 54 and pass through shaft coupling and shaft
52 one end is fixedly connected, and third servo motor 53 operates, and output shaft rotation drives shaft 52 to rotate in connection frame 51, in turn
Realize the adjusting of demonstration tilt angle, the front end of connecting plate 54 is equipped with electric curtain 6, electric screen in inclination angle regulator 5
Cloth 6 realizes the displaying of project content, and curved bar 7 is equipped at the front side upper end center of electric curtain 6, and curved bar 7 plays connection support
Effect, the front end of curved bar 7 is equipped with projector 8, by the regulation of PLC controller 9, content that projector 8 shoots high photographing instrument 13
It shows on electric curtain 6, projector 8 is correspondingly arranged with electric curtain 6, and side is set from left to right on rear side of the upper end of demonstration box 1
There are PLC controller 9, display screen 10 and show stand 11, the upper center of demonstration box 1 is equipped with elastic rod 12, and PLC controller 9 regulates and controls
The normal operation of each device, the display teaching graph-text content of display screen 10, the top of elastic rod 12 is equipped with high photographing instrument 13, elastic rod 12
Support is provided for high photographing instrument 13, high photographing instrument 13 shoots the content of courses, and bottom end is equipped with battery 18, battery in the case of demonstration box 1
18 guarantee power supply, and the front side of demonstration box 1 is equipped with clipboard 15, and teacher can also write weight difficult point knowledge on clipboard 15
Point, imparts knowledge to students emphatically, and the bottom surface quadrangle of demonstration box 1 is equipped with universal wheel 16, and universal wheel 16 is mobile convenient for device, the right side of demonstration box 1
Equipped with push rod 17, push rod 17 pushes demonstration box 1 convenient for personnel's stress, and middle part is equipped with supporting plate 19 in the case of demonstration box 1, and supporting plate 19 mentions
For the storage of books and teaching equipment, side is hinged with gear door 30 at the rear openings of demonstration box 1, and gear door 30 realizes demonstration box 1
The curtain front side bottom end of the opening and closing of rear openings, electric curtain 6 is equipped with equally distributed iron plate 14, and iron plate 14 avoids electric curtain
The occurrence of fold is to influence viewing quality occurs when 6 expansion, the output end electrical connection PLC controller 9 of battery 18
Input terminal, electric expansion column 20, electric curtain 6, projector 8, display screen 10, high photographing instrument 13, first servo motor 24, second are watched
The input terminal for taking motor 44 and third servo motor 53 is electrically connected the output end of PLC controller 9, and PLC controller 9 controls electronic
Telescopic mast 20, electric curtain 6, projector 8, display screen 10, high photographing instrument 13, first servo motor 24,44 and of the second servo motor
The mode of third servo motor 53 is method commonly used in the prior art, electric expansion column 20, electric curtain 6, projector 8,
Display screen 10, high photographing instrument 13, first servo motor 24, the second servo motor 44 and third servo motor 53 are in the prior art
The common original part of teaching equipment.
When in use: demonstration box 1 and top device are moved to by teacher's hand push push rod 17 under the action of universal wheel 16
Area of display swings elastic rod 12 by the regulation of PLC controller 9, and high photographing instrument 13 is directed at what teacher on show stand 11 write
The graph-text content shown in the content of courses or align display screens 10 is captured, and is projected on electric curtain 6 by projector 8, is learned
The sin cos functions content by projecting on electric curtain 6 is practised, it is intuitive quickly to grasp knowledge point, according to student's seating position, the
The operating of one servo motor 24, output shaft rotation drive screw rod 22 to rotate, due to the middle part of screw rod 22 and the upper end spiral shell of supporting block 23
Pit is threadedly coupled, and is slidably connected in sliding block 25 and the slot internal chute of concave-board 21, realizes a left side for supporting block 23 and top device
Right position is adjusted, and electric expansion column 20 is flexible, realizes the adjusting of demonstration height, the operating of the second servo motor 44, output shaft rotation
Band moving gear 45 rotates, and since gear 45 engages connection with tooth socket 43, turntable 42 is rotatablely connected on plane bearing 41, realizes
The demonstration of level angle is adjusted, and third servo motor 53 operates, and output shaft rotation drives shaft 52 to rotate in connection frame 51, into
And realize the adjusting of demonstration tilt angle, to reach the omnibearing angel adjusting to project content, guarantee each orientation student
The accurate exhaustive of knowledge point is grasped, teacher can also write weight difficult point knowledge point on clipboard 15, impart knowledge to students emphatically, use
After, each device restores original sample.
In the teaching that the utility model is write teacher on show stand 11 by the regulation of PLC controller 9, high photographing instrument 13
The graph-text content shown in appearance or display screen 10 is captured, and is projected on electric curtain 6 by projector 8, projection demonstration is intuitive
Understandable, the study of teaching and student to teacher brings great convenience, and can demand as needed, the first servo electricity
Machine 24 operates, and output shaft rotation drives screw rod 22 to rotate, due to the middle part of screw rod 22 and the threaded upper ends hole screw thread of supporting block 23
It connects, is slidably connected in sliding block 25 and the slot internal chute of concave-board 21, realize the left-right position tune of supporting block 23 and top device
Section, electric expansion column 20 is flexible, realizes the adjusting of demonstration height, the operating of the second servo motor 44, output shaft rotation driven gear
45 rotations, since gear 45 engages connection with tooth socket 43, turntable 42 is rotatablely connected on plane bearing 41, is realized in level angle
Demonstration adjust, third servo motor 53 operate, output shaft rotation drive shaft 52 rotated in connection frame 51, and then realize drill
Show the adjusting of tilt angle, to reach the omnibearing angel adjusting to project content, convenient for each orientation student to knowledge point
Accurate exhaustive grasp, alleviate the teaching load of teacher, ensure that quality of instruction, improve the use of projection demonstration device
Efficiency.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.
Claims (5)
1. a kind of sin cos functions two-dimensional projection apparatus for demonstrating, including demonstration box (1), it is characterised in that: the demonstration box (1)
Left and right adjusting device (2) are equipped on front side of upper end, the upper end of supporting block (23) is equipped with electric expansion column in left and right adjusting device (2)
(20), at the top of the telescopic end of electric expansion column (20) be fixedly connected at the bottom center of disk (3), the upper end of disk (3) is set
Have level angle regulating device (4), tilt angle is equipped on front side of the upper end of level angle regulating device (4) turntable (42) and is adjusted
Device (5), the front end of connecting plate (54) is equipped with electric curtain (6) in inclination angle regulator (5), before electric curtain (6)
Curved bar (7) are equipped at the upper end center of side, the front end of curved bar (7) is equipped with projector (8), and projector (8) is corresponding with electric curtain (6)
Setting, side is equipped with PLC controller (9), display screen (10) and show stand (11) to the upper end rear side of demonstration box (1) from left to right,
The upper center of demonstration box (1) is equipped with elastic rod (12), and the top of elastic rod (12) is equipped with high photographing instrument (13), demonstration box (1)
Bottom end is equipped with battery (18) in case, the input terminal of output end electrical connection PLC controller (9) of battery (18), electric expansion
Column (20), electric curtain (6), projector (8), display screen (10) and high photographing instrument (13) input terminal be electrically connected PLC controller
(9) output end.
2. a kind of sin cos functions two-dimensional projection apparatus for demonstrating according to claim 1, it is characterised in that: adjust the left and right
Regulating device (2) includes concave-board (21), is equipped with concave-board (21) on front side of the upper end of the demonstration box (1), the slot of concave-board (21)
Inner wall is rotatablely connected by the both ends of bearing and screw rod (22), the middle part of screw rod (22) and the threaded upper ends hole spiral shell of supporting block (23)
The rear side of line connection, supporting block (23) is equipped with sliding block (25), is slidably connected in sliding block (25) and the slot internal chute of concave-board (21),
The side of concave-board (21) is equipped with first servo motor (24), and the output shaft of first servo motor (24) passes through concave-board (21)
Side through-hole is simultaneously fixedly connected by shaft coupling with one end of screw rod (22), the input terminal electrical connection of first servo motor (24)
The output end of PLC controller (9).
3. a kind of sin cos functions two-dimensional projection apparatus for demonstrating according to claim 1, it is characterised in that: the horizontal angle
Spending regulating device (4) includes plane bearing (41), is equipped with plane bearing (41) on front side of the upper end of the disk (3), plane bearing
(41) upper end is rotatably connected to turntable (42), and the cambered surface of turntable (42) is equipped with tooth socket (43), is set on rear side of the upper end of disk (3)
Have the second servo motor (44), the upper end output shaft top of the second servo motor (44) is equipped with gear (45), gear (45) and tooth
Slot (43) engagement connection, the output end of input terminal electrical connection PLC controller (9) of the second servo motor (44).
4. a kind of sin cos functions two-dimensional projection apparatus for demonstrating according to claim 1, it is characterised in that: the inclination angle
Spending regulating device (5) includes connection frame (51), is fixedly connected on front side of the bottom surface of the connection frame (51) and the upper end of turntable (42),
The inner sidewall of connection frame (51) is rotatablely connected by the both ends of bearing and shaft (52), the cambered surface of shaft (52) and connecting plate (54)
Rear end be fixedly connected, the side of connection frame (51) is equipped with third servo motor (53), the output shaft of third servo motor (53)
Across connecting plate (54) side through-hole and be fixedly connected by shaft coupling with one end of shaft (52), third servo motor (53)
Input terminal electrical connection PLC controller (9) output end.
5. a kind of sin cos functions two-dimensional projection apparatus for demonstrating according to claim 1, it is characterised in that: the demonstration box
(1) front side is equipped with clipboard (15), and the bottom surface quadrangle of demonstration box (1) is equipped with universal wheel (16), and the right side of demonstration box (1) is equipped with
Push rod (17), the interior middle part of the case of demonstration box (1) are equipped with supporting plate (19), and side is hinged with gear door at the rear openings of demonstration box (1)
(30), bottom end is equipped with equally distributed iron plate (14) on front side of the curtain of electric curtain (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822247331.1U CN209560742U (en) | 2018-12-29 | 2018-12-29 | A kind of sin cos functions two-dimensional projection apparatus for demonstrating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822247331.1U CN209560742U (en) | 2018-12-29 | 2018-12-29 | A kind of sin cos functions two-dimensional projection apparatus for demonstrating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209560742U true CN209560742U (en) | 2019-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822247331.1U Expired - Fee Related CN209560742U (en) | 2018-12-29 | 2018-12-29 | A kind of sin cos functions two-dimensional projection apparatus for demonstrating |
Country Status (1)
| Country | Link |
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| CN (1) | CN209560742U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111061117A (en) * | 2020-01-16 | 2020-04-24 | 安徽西柚酷媒信息科技有限公司 | Huge curtain projection arrangement convenient to adjust projection angle |
| CN111341214A (en) * | 2020-04-23 | 2020-06-26 | 深圳市朗形数字科技有限公司 | Method and device for correcting and seamlessly fusing multi-screen splicing projection curved surfaces |
| CN112435613A (en) * | 2020-12-08 | 2021-03-02 | 大连交通大学 | Internet new media publishes display device with adjustment mechanism |
| CN112951048A (en) * | 2021-02-25 | 2021-06-11 | 潍坊工程职业学院 | Accounting practice teaching simulation sand table |
| CN113539044A (en) * | 2021-07-21 | 2021-10-22 | 日照职业技术学院 | Teaching of high-duty logistics management is with presentation device that teaching effect is good |
| CN115249447A (en) * | 2022-01-13 | 2022-10-28 | 浙江理工大学 | Digital holographic projection device for art design |
-
2018
- 2018-12-29 CN CN201822247331.1U patent/CN209560742U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111061117A (en) * | 2020-01-16 | 2020-04-24 | 安徽西柚酷媒信息科技有限公司 | Huge curtain projection arrangement convenient to adjust projection angle |
| CN111341214A (en) * | 2020-04-23 | 2020-06-26 | 深圳市朗形数字科技有限公司 | Method and device for correcting and seamlessly fusing multi-screen splicing projection curved surfaces |
| CN112435613A (en) * | 2020-12-08 | 2021-03-02 | 大连交通大学 | Internet new media publishes display device with adjustment mechanism |
| CN112951048A (en) * | 2021-02-25 | 2021-06-11 | 潍坊工程职业学院 | Accounting practice teaching simulation sand table |
| CN112951048B (en) * | 2021-02-25 | 2022-03-04 | 潍坊工程职业学院 | Accounting practice teaching simulation sand table |
| CN113539044A (en) * | 2021-07-21 | 2021-10-22 | 日照职业技术学院 | Teaching of high-duty logistics management is with presentation device that teaching effect is good |
| CN115249447A (en) * | 2022-01-13 | 2022-10-28 | 浙江理工大学 | Digital holographic projection device for art design |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20191029 Termination date: 20201229 |