Interactive intelligent blackboard with projection screen structure

Abstract

The invention belongs to the technical field of projection screen blackboards, and particularly relates to an interactive intelligent blackboard with a projection screen structure, the interactive intelligent blackboard comprises a fixing frame, a blackboard main body and a projection screen display, a fixing box is arranged at one end, far away from a first fixing shaft, of the top of an upper movable plate, and a first motor is arranged on one side, far away from the first fixing shaft, of the interior of the fixing box; the output end of the first motor is connected with a first gear. When the interactive intelligent blackboard with the screen projection structure is used, two blackboard bodies are arranged, so that one blackboard body and one screen projection displayer can be used for conducting blackboard writing teaching on the blackboard while screen projection is conducted according to actual needs during teaching, and the two blackboard bodies can be used at the same time when screen projection is not conducted; the use area of the blackboard body is increased, two projection screen displayers can be used at the same time, surrounding students can watch projection screen content more clearly by rotating the projection screen displayers by different angles, and teaching flexibility is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of screen projection blackboard, and specifically is an interactive smart blackboard with a screen projection structure. Background Art

[0002] Blackboard does not refer to a black board. In the traditional sense, it is a flat surface that can be repeatedly written with chalk. The board surface is hard and is mostly used for teaching. It is usually made of wood or frosted glass, and can be written on with chalk or other specific writing materials. It is mostly black, dark green, white or beige. With the development of the times, the current teaching blackboards include electronic blackboards, multi-functional combination boards, combined push-pull blackboards, interactive electronic whiteboards, projection boards with screens, etc.

[0003] After searching, a projection blackboard for education and teaching is found in announcement number CN112793338A. The invention discloses a projection blackboard for education and teaching, which relates to the technical field related to projection blackboards, including a concave plate and a blackboard. The blackboard is slidably installed in the inner cavity of the concave plate, and U-shaped slide grooves are provided on both sides of the inner cavity of the concave plate, and first protective devices are provided on both sides of the inner cavity. Both sides of the blackboard are slidably installed in the inner cavity of the U-shaped slide groove, and a projection screen panel is fixedly installed on one side, and second protective devices are provided on the left and right sides of the concave plate.

[0004] When the above blackboard is in use, by providing the first protective device and the second protective device, it can make it more convenient for the blackboard to slide and flip in the inner cavity of the U-shaped slide groove. By providing the flipping device, the space occupied by the blackboard can be reduced when flipping, making the blackboard more convenient to use. At the same time, when projecting the screen, there is no need to push and pull the blackboard, so that the use space of the blackboard is increased when in use. However, there are still some problems as follows:

[0005] 1. Compared with the traditional push-pull blackboard, the above blackboard is easy to operate and does not need to be pushed and pulled repeatedly. However, when used for screen projection, the blackboard is flipped to the position of the projection cloth, and the blackboard cannot be used during screen projection, which is not flexible enough for teaching use.

[0006] 2. Compared with traditional blackboards, when teaching some courses, such as teaching physical and chemical experiments in the classroom, a large number of teaching experimental equipment are needed. Placing them on the podium will affect students' line of sight of the blackboard or projection screen. This blackboard can also store teaching equipment used for teaching when in use.

[0007] Therefore, in order to solve the above problems, an interactive smart blackboard with a projection structure is proposed. Summary of the invention

[0008] 1. Technical issues to be resolved

[0009] In view of the shortcomings of the prior art, the present invention provides an interactive smart blackboard with a projection screen structure, which solves the problems of flexibility in the simultaneous use of the blackboard and the projection screen and the placement of teaching aids.

[0010] (II) Technical solution

[0011] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an interactive smart blackboard with a projection structure, comprising a fixed frame, a blackboard main body and a projection display, hydraulic cylinders are arranged on both sides of the top of the fixed frame, an extension section of the hydraulic cylinder is connected to a movable block, an adjusting plate is arranged in front of the movable block, one end of the adjusting plate is connected to the movable block, and the other end of the adjusting plate is connected to the movable plate, sliding grooves are opened on both sides of the rear of the fixed frame, a sliding plate is arranged below the movable block, a sliding sleeve block is arranged below the sliding plate, a supporting sliding rod is passed through the interior of the sliding sleeve block, a second adjusting plate is arranged in front of the sliding sleeve block, one end of the second adjusting plate is connected to the sliding sleeve block, and the other end of the second adjusting plate is connected to the second movable plate, and a first fixed shaft is arranged between the two movable plates.

[0012] Preferably, the hydraulic cylinder is fixedly connected to the movable block, the adjusting plate is movably pinned to the movable block and the movable plate respectively, the movable plate is movably pinned to the fixed frame, the movable block is fixedly connected to the sliding plate, the sliding plate is adapted to the sliding groove, the sliding plate is fixedly connected to the sleeve block, the supporting sliding rod passes through the sleeve block, the second adjusting plate is movably pinned to the second movable plate and the sleeve block respectively, and the two movable plates are fixedly connected to the first fixed shaft.

[0013] Preferably, a fixing box is provided at one end of the top of the movable plate away from the first fixed axis, a first motor is provided inside the fixing box on a side away from the first fixed axis, a first gear is connected to the output end of the first motor, a second gear is provided on the side of the first gear close to the first fixed axis, a driving shaft is passed through the inside of the second gear, a blackboard body is provided below the driving shaft, and a projection display is provided on the back of the blackboard body.

[0014] Preferably, the first motor is fixedly connected to the first gear, the first gear is meshed with the second gear, the second gear is fixedly connected to the driving shaft, the driving shaft is fixedly connected to the blackboard body, and the blackboard body is fixedly connected to the projection display.

[0015] Preferably, a second fixed shaft is provided at the bottom of the fixed frame, a movable frame is provided on the outer sleeve of the second fixed shaft, three protective plates are provided inside the movable frame, a first sprocket is provided on the left side of the top protective plate, a first chain is provided on the outer sleeve of the first sprocket, a second sprocket is provided below the first chain, a third sprocket is provided on the left side of the second sprocket, a second chain is provided on the outer sleeve of the third sprocket, a fourth sprocket is provided below the second chain, and the input end of the first sprocket is connected to a second motor.

[0016] Preferably, the fixed frame is movably pin-connected to the movable frame via a second fixed shaft, the top protective plate is fixedly connected to the first sprocket via a shaft, the middle protective plate is fixedly connected to the second sprocket via a shaft, the second sprocket is fixedly connected to the third sprocket via a shaft, the bottom protective plate is fixedly connected to the fourth sprocket via a shaft, the first sprocket is chain-driven with the second sprocket via a first chain, the third sprocket is chain-driven with the fourth sprocket via a second chain, and the first sprocket is fixedly connected to the second motor.

[0017] Preferably, fixed blocks are provided on both sides of the bottom of the movable frame, a first magnet block is provided in front of the fixed block, a fixed socket is provided above the fixed block, fixed bases are provided on both sides of the top of the fixed frame, a second magnet block is provided in front of the fixed base, a fixing screw is passed through the top of the fixed base, and a fixing block is provided at the bottom of the fixing screw.

[0018] Preferably, the movable frame is fixedly connected to the fixed block, the fixed block is fixedly connected to the first magnetic block, the first magnetic block is magnetically connected to the second magnetic block, the second magnetic block is fixedly connected to the fixed base, the fixed base is threadedly matched with the fixed screw, the fixed screw is fixedly connected to the fixed plug block, and the fixed plug block is adapted to the fixed socket.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the present invention provides an interactive smart blackboard with a projection structure, which has the following beneficial effects:

[0021] 1. When the interactive smart blackboard with a projection structure is in use, the hydraulic cylinder is started to push the movable block to move, and under the action of the sliding plate, the sliding block is driven to move along the supporting slide rod. Since the adjusting plate is respectively connected to the movable block and the movable plate with movable pins, and the movable plate is connected to the fixed frame with movable pins, the second adjusting plate is respectively connected to the second movable plate and the sliding block with movable pins, and the two movable plates are fixedly connected to the first fixed axis, when the movable block and the sliding block move, they are pushed by the adjusting plate to rotate around the first fixed axis, thereby adjusting the position of the blackboard main body to facilitate the switching between the blackboard main body and the projection display, and the position of the blackboard main body can also be adjusted in time according to actual needs.

[0022] 2. When the interactive smart blackboard with a projection structure is in use, the first motor is started to drive the first gear to rotate. Under the meshing action of the gears, the second gear drives the driving shaft to rotate, so that the blackboard body can be rotated. During the teaching process, when projection is needed, it can be directly rotated, and the projection display can be flipped to the front for projection. Two blackboard bodies are set to facilitate teaching. According to actual needs, one blackboard body and one projection display can be used to project the screen and write on the blackboard at the same time. When not projecting, two blackboard bodies can be used at the same time to increase the use area of ​​the blackboard body. Two projection displays can also be used at the same time. By rotating at different angles, students around can see the content of the projection more clearly, which increases the flexibility of teaching.

[0023] 3. When the interactive smart blackboard with a projection structure is in use, the protective plate rotates and opens with the movable frame around the second fixed axis, and the second motor is started to drive the first sprocket to rotate. Since the first sprocket is driven by the first chain and the second sprocket chain, under the action of friction, the first sprocket pushes the first chain to drive the second sprocket to rotate synchronously, so that the third sprocket rotates accordingly. Since the third sprocket is driven by the second chain and the fourth sprocket chain, under the action of friction, the third sprocket pushes the second chain to drive the fourth sprocket to rotate synchronously, so that the three protective plates can rotate synchronously, thereby playing the role of a placement board. When teaching, all teaching aids can be placed on the placement board to avoid placing them on the podium to affect the students' line of sight.

[0024] 4. After the interactive smart blackboard with a projection structure is used, the second motor is started to rotate the protective plate to a vertical state, and the movable frame rotates around the second fixed axis to block the front of the blackboard body. Through the magnetic attraction of the first magnet block and the second magnet block, the fixed block enters the fixed base, and the fixing screw is rotated. Under the action of the thread, the fixed plug is pushed into the fixed socket to complete the fixation of the movable frame, so that the protective plate plays a protective role. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the three-dimensional structure inside the fixing frame of the present invention;

[0028] Figure 3 It is a three-dimensional structural schematic diagram of the blackboard position adjustment mechanism of the present invention;

[0029] Figure 4 It is a schematic diagram of the three-dimensional structure of the protective plate of the present invention when it is protecting;

[0030] Figure 5 The present invention Figure 2 A partial enlarged schematic diagram in the middle;

[0031] Figure 6 The present invention Figure 4 A partial enlarged schematic diagram of point B in the middle.

[0032] In the figure: 1. fixed frame; 2. hydraulic cylinder; 3. movable block; 4. adjustment plate; 5. movable plate; 6. sliding groove; 7. sliding plate; 8. sliding block; 9. supporting slide rod; 10. first fixed axis; 11. fixed box; 12. first motor; 13. first gear; 14. second gear; 15. driving shaft; 16. blackboard body; 17. projection display; 18. second fixed axis; 19. movable frame; 20. protective plate; 21. first sprocket; 22. first chain; 23. second sprocket; 24. third sprocket; 25. second chain; 26. fourth sprocket; 27. second motor; 28. fixed block; 29. ​​first magnet block; 30. fixed socket; 31. fixed base; 32. second magnet block; 33. fixed screw; 34. fixed plug. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Specific examples are given below.

[0035] See also Figure 1-Figure 3The present invention provides an interactive smart blackboard with a projection structure, including a fixed frame 1, a blackboard body 16 and a projection display 17, hydraulic cylinders 2 are arranged on both sides of the top of the fixed frame 1, the extension section of the hydraulic cylinder 2 is connected with a movable block 3, an adjusting plate 4 is arranged in front of the movable block 3, one end of the adjusting plate 4 is connected with the movable block 3, and the other end of the adjusting plate 4 is connected with a movable plate 5, sliding grooves 6 are arranged on both sides of the rear of the fixed frame 1, a sliding plate 7 is arranged below the movable block 3, a sliding sleeve block 8 is arranged below the sliding plate 7, a supporting sliding rod 9 is penetrated inside the sliding sleeve block 8, and a second adjusting plate 4 is arranged in front of the sliding sleeve block 8 Plate 4, one end of the second adjusting plate 4 is connected to the sliding block 8, the other end of the second adjusting plate 4 is connected to the second movable plate 5, a first fixed shaft 10 is arranged between the two movable plates 5, the hydraulic cylinder 2 is fixedly connected to the movable block 3, the adjusting plate 4 is movably pinned to the movable block 3 and the movable plate 5 respectively, the movable plate 5 is movably pinned to the fixed frame 1, the movable block 3 is fixedly connected to the sliding plate 7, the sliding plate 7 is adapted to the sliding groove 6, the sliding plate 7 is fixedly connected to the sliding block 8, the supporting sliding rod 9 passes through the sliding block 8, the second adjusting plate 4 is movably pinned to the second movable plate 5 and the sliding block 8 respectively, and the two movable plates 5 are fixedly connected to the first fixed shaft 10.

[0036] Through the above scheme: when in use, the hydraulic cylinder 2 is started to push the movable block 3 to move, and under the action of the sliding plate 7, the sliding block 8 is driven to move along the supporting slide rod 9. Since the adjusting plate 4 is respectively movably pinned to the movable block 3 and the movable plate 5, and the movable plate 5 is movably pinned to the fixed frame 1, the second adjusting plate 4 is respectively movably pinned to the second movable plate 5 and the sliding block 8, and the two movable plates 5 are fixedly connected to the first fixed shaft 10. When the movable block 3 and the sliding block 8 move, they are acted upon by the adjusting plate 4 to push the movable plate 5 to rotate around the first fixed shaft 10, thereby adjusting the position of the blackboard main body 16 to facilitate the switching of the blackboard main body 16 and the projection display 17, and the position of the blackboard main body 16 can also be adjusted in time according to actual needs.

[0037] Further Figure 1 , Figure 2 and Figure 5As shown, a fixing box 11 is provided at one end of the top of the upper movable plate 5 away from the first fixed axis 10, a first motor 12 is provided on the side of the fixing box 11 away from the first fixed axis 10, an output end of the first motor 12 is connected to a first gear 13, a second gear 14 is provided on the side of the first gear 13 close to the first fixed axis 10, a driving shaft 15 is passed through the inside of the second gear 14, a blackboard body 16 is provided below the driving shaft 15, a projection display 17 is provided on the back of the blackboard body 16, the first motor 12 is fixedly connected to the first gear 13, the first gear 13 is meshed with the second gear 14, the second gear 14 is fixedly connected to the driving shaft 15, the driving shaft 15 is fixedly connected to the blackboard body 16, and the blackboard body 16 is fixedly connected to the projection display 17.

[0038] Through the above scheme: when in use, the first motor 12 is started, driving the first gear 13 to rotate, and under the meshing action of the gears, the second gear 14 drives the driving shaft 15 to rotate, so that the blackboard body 16 can be rotated. During the teaching process, when screen projection is needed, it can be directly rotated, and the projection display 17 can be flipped to the front for projection. Two blackboard bodies 16 are set to facilitate teaching. According to actual needs, one blackboard body 16 and one projection display 17 can be used to carry out blackboard teaching while projecting the screen. It is also possible to use two blackboard bodies 16 at the same time when not projecting the screen to increase the use area of ​​the blackboard body 16. It is also possible to use two projection displays 17 at the same time. By rotating at different angles, the surrounding students can see the content of the projection more clearly, thereby increasing the flexibility of teaching.

[0039] Further Figure 1 , Figure 2 and Figure 4 As shown, a second fixed shaft 18 is provided at the bottom of the fixed frame 1, a movable frame 19 is provided on the outside of the second fixed shaft 18, three protective plates 20 are provided inside the movable frame 19, a first sprocket 21 is provided on the left side of the top protective plate 20, a first chain 22 is provided on the outside of the first sprocket 21, a second sprocket 23 is provided below the first chain 22, a third sprocket 24 is provided on the left side of the second sprocket 23, a second chain 25 is provided on the outside of the third sprocket 24, a fourth sprocket 26 is provided below the second chain 25, and the input end of the first sprocket 21 is connected to The second motor 27, the fixed frame 1 is movably pinned to the movable frame 19 through the second fixed shaft 18, the top protective plate 20 is fixedly connected to the first sprocket 21 through the shaft, the middle protective plate 20 is fixedly connected to the second sprocket 23 through the shaft, the second sprocket 23 is fixedly connected to the third sprocket 24 through the shaft, the bottom protective plate 20 is fixedly connected to the fourth sprocket 26 through the shaft, the first sprocket 21 is chain-driven with the second sprocket 23 through the first chain 22, the third sprocket 24 is chain-driven with the fourth sprocket 26 through the second chain 25, and the first sprocket 21 is fixedly connected to the second motor 27.

[0040] Through the above scheme: when in use, the protective plate 20 rotates and opens with the movable frame 19 around the second fixed axis 18, and the second motor 27 is started to drive the first sprocket 21 to rotate. Since the first sprocket 21 is chain-driven by the first chain 22 and the second sprocket 23, under the action of friction, the first sprocket 21 pushes the first chain 22 to drive the second sprocket 23 to rotate synchronously, so that the third sprocket 24 rotates accordingly. Since the third sprocket 24 is chain-driven by the second chain 25 and the fourth sprocket 26, under the action of friction, the third sprocket 24 pushes the second chain 25 to drive the fourth sprocket 26 to rotate synchronously, so that the three protective plates 20 can rotate synchronously and rotate to a horizontal state, thereby playing the role of a placement board. When teaching, all teaching aids can be placed on the placement board to avoid placing them on the podium to affect the students' line of sight.

[0041] Further Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, fixed blocks 28 are provided on both sides of the bottom of the movable frame 19, a first magnet block 29 is provided in front of the fixed block 28, a fixed socket 30 is opened above the fixed block 28, fixed bases 31 are provided on both sides of the top of the fixed frame 1, a second magnet block 32 is provided in front of the fixed base 31, a fixing screw 33 is passed through the top of the fixed base 31, and a fixed plug 34 is provided at the bottom of the fixing screw 33, the movable frame 19 is fixedly connected to the fixed block 28, the fixed block 28 is fixedly connected to the first magnet block 29, the first magnet block 29 is magnetically connected to the second magnet block 32, the second magnet block 32 is fixedly connected to the fixed base 31, the fixed base 31 is threadedly matched with the fixing screw 33, the fixing screw 33 is fixedly connected to the fixed plug 34, and the fixed plug 34 is adapted to the fixed socket 30.

[0042] Through the above scheme: after use, the second motor 27 is started to rotate the protective plate 20 to a vertical state, the movable frame 19 rotates around the second fixed axis 18, blocking the front of the blackboard body 16, and the first magnet block 29 and the second magnet block 32 are magnetically attracted to make the fixed block 28 enter the fixed base 31, and the fixed screw 33 is rotated. Under the action of the thread, the fixed plug block 34 is pushed to be inserted into the fixed socket 30, thereby completing the fixation of the movable frame 19 and allowing the protective plate 20 to play a protective role.

[0043] Working principle:

[0044] First, when in use, the hydraulic cylinder 2 is started to push the movable block 3 to move, and under the action of the sliding plate 7, the sliding block 8 is driven to move along the supporting slide rod 9. Since the adjusting plate 4 is respectively movably pinned to the movable block 3 and the movable plate 5, and the movable plate 5 is movably pinned to the fixed frame 1, the second adjusting plate 4 is respectively movably pinned to the second movable plate 5 and the sliding block 8, and the two movable plates 5 are fixedly connected to the first fixed shaft 10. When the movable block 3 and the sliding block 8 move, they are acted upon by the adjusting plate 4 to push the movable plate 5 to rotate around the first fixed shaft 10, so that the position of the blackboard main body 16 can be adjusted to facilitate the switching of the blackboard main body 16 and the projection display 17, and the position of the blackboard main body 16 can also be adjusted in time according to actual needs.

[0045] Secondly, when in use, the first motor 12 is started, driving the first gear 13 to rotate, and under the meshing action of the gears, the second gear 14 drives the driving shaft 15 to rotate, so that the blackboard body 16 can be rotated. During the teaching process, when screen projection is needed, it can be directly rotated, and the projection display 17 can be flipped to the front for projection. Two blackboard bodies 16 are set to facilitate teaching. According to actual needs, one blackboard body 16 and one projection display 17 can be used to carry out blackboard teaching while projecting the screen. It is also possible to use two blackboard bodies 16 at the same time when not projecting the screen to increase the use area of ​​the blackboard body 16. Two projection displays 17 can also be used at the same time. By rotating at different angles, students around can see the content of the projection more clearly, thereby increasing the flexibility of teaching.

[0046] Then, when in use, the protective plate 20 rotates and opens with the movable frame 19 around the second fixed axis 18, and the second motor 27 is started to drive the first sprocket 21 to rotate. Since the first sprocket 21 is chain-driven with the first chain 22 and the second sprocket 23, under the action of friction, the first sprocket 21 pushes the first chain 22 to drive the second sprocket 23 to rotate synchronously, thereby causing the third sprocket 24 to rotate accordingly. Since the third sprocket 24 is chain-driven with the second chain 25 and the fourth sprocket 26, under the action of friction, the third sprocket 24 pushes the second chain 25 to drive the fourth sprocket 26 to rotate synchronously, so that the three protective plates 20 can rotate synchronously, thereby playing the role of a placement board. When teaching, all teaching aids can be placed on the placement board to avoid placing them on the podium to affect the students' line of sight.

[0047] Finally, after use is completed, the second motor 27 is started to rotate the protective plate 20 to a vertical state, and the movable frame 19 rotates around the second fixed axis 18 to block the front of the blackboard body 16. Through the magnetic attraction of the first magnet block 29 and the second magnet block 32, the fixed block 28 enters the fixed base 31, and the fixed screw 33 is rotated. Under the action of the thread, the fixed plug block 34 is pushed to be inserted into the fixed socket 30, thereby completing the fixation of the movable frame 19 and allowing the protective plate 20 to play a protective role.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An interactive smart blackboard with a projection screen structure, comprising a fixing frame (1), a blackboard body (16) and a projection screen display (17), characterized in that: A hydraulic cylinder (2) is provided on both sides of the top of the fixed frame (1), an extension section of the hydraulic cylinder (2) is connected to a movable block (3), an adjustment plate (4) is provided in front of the movable block (3), one end of the adjustment plate (4) is connected to the movable block (3), and the other end of the adjustment plate (4) is connected to the movable plate (5), sliding grooves (6) are provided on both sides of the rear of the fixed frame (1), a sliding plate (7) is provided below the movable block (3), a sliding sleeve block (8) is provided below the sliding plate (7), a supporting sliding rod (9) is passed through the inside of the sliding sleeve block (8), a second adjustment plate (4) is provided in front of the sliding sleeve block (8), one end of the second adjustment plate (4) is connected to the sliding sleeve block (8), and the other end of the second adjustment plate (4) is connected to the second movable plate (5), and a first fixed shaft (10) is provided between the two movable plates (5).

2. The interactive smart blackboard with a projection structure according to claim 1, characterized in that: The hydraulic cylinder (2) is fixedly connected to the movable block (3), the adjustment plate (4) is movably pin-connected to the movable block (3) and the movable plate (5) respectively, the movable plate (5) is movably pin-connected to the fixed frame (1), the movable block (3) is fixedly connected to the sliding plate (7), the sliding plate (7) is adapted to the sliding groove (6), the sliding plate (7) is fixedly connected to the sliding sleeve block (8), the supporting sliding rod (9) passes through the sliding sleeve block (8), the second adjustment plate (4) is movably pin-connected to the second movable plate (5) and the sliding sleeve block (8) respectively, and the two movable plates (5) are fixedly connected to the first fixed shaft (10).

3. The interactive smart blackboard with a projection structure according to claim 1, characterized in that: A fixing box (11) is arranged at one end of the top of the movable plate (5) away from the first fixed shaft (10), a first motor (12) is arranged inside the fixing box (11) on the side away from the first fixed shaft (10), an output end of the first motor (12) is connected to a first gear (13), a second gear (14) is arranged on the side of the first gear (13) close to the first fixed shaft (10), a driving shaft (15) is passed through the inside of the second gear (14), a blackboard body (16) is arranged below the driving shaft (15), and a projection display (17) is arranged on the back of the blackboard body (16).

4. The interactive smart blackboard with a projection structure according to claim 3 is characterized by: The first motor (12) is fixedly connected to the first gear (13), the first gear (13) is meshed with the second gear (14), the second gear (14) is fixedly connected to the driving shaft (15), the driving shaft (15) is fixedly connected to the blackboard body (16), and the blackboard body (16) is fixedly connected to the projection display (17).

5. The interactive smart blackboard with a projection structure according to claim 1, characterized in that: A second fixed shaft (18) is arranged at the bottom of the fixed frame (1), a movable frame (19) is sleeved on the outside of the second fixed shaft (18), three protective plates (20) are arranged inside the movable frame (19), a first sprocket (21) is arranged on the left side of the topmost protective plate (20), a first chain (22) is sleeved on the outside of the first sprocket (21), a second sprocket (23) is arranged below the first chain (22), a third sprocket (24) is arranged on the left side of the second sprocket (23), a second chain (25) is sleeved on the outside of the third sprocket (24), a fourth sprocket (26) is arranged below the second chain (25), and an input end of the first sprocket (21) is connected to a second motor (27).

6. The interactive smart blackboard with a projection structure according to claim 5, characterized in that: The fixed frame (1) is movably pin-connected with the movable frame (19) via a second fixed shaft (18); the top protective plate (20) is fixedly connected to the first sprocket (21) via a shaft; the middle protective plate (20) is fixedly connected to the second sprocket (23) via a shaft; the second sprocket (23) is fixedly connected to the third sprocket (24) via a shaft; the bottom protective plate (20) is fixedly connected to the fourth sprocket (26) via a shaft; the first sprocket (21) is chain-driven with the second sprocket (23) via a first chain (22); the third sprocket (24) is chain-driven with the fourth sprocket (26) via a second chain (25); and the first sprocket (21) is fixedly connected to the second motor (27).

7. The interactive smart blackboard with a projection structure according to claim 5, characterized in that: Fixed blocks (28) are provided on both sides of the bottom of the movable frame (19), a first magnet block (29) is provided in front of the fixed block (28), a fixed plug hole (30) is provided above the fixed block (28), fixed bases (31) are provided on both sides of the top of the fixed frame (1), a second magnet block (32) is provided in front of the fixed base (31), a fixed screw (33) is passed through the top of the fixed base (31), and a fixed plug block (34) is provided at the bottom of the fixed screw (33).

8. The interactive smart blackboard with a projection structure according to claim 7, characterized in that: The movable frame (19) is fixedly connected to the fixed block (28), the fixed block (28) is fixedly connected to the first magnet block (29), the first magnet block (29) is magnetically connected to the second magnet block (32), the second magnet block (32) is fixedly connected to the fixed base (31), the fixed base (31) is threadedly matched with the fixed screw (33), the fixed screw (33) is fixedly connected to the fixed plug block (34), and the fixed plug block (34) is compatible with the fixed socket (30).

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