Multifunctional teaching demonstration device and teaching method thereof

Abstract

The invention discloses a multifunctional teaching demonstration device and a teaching method thereof, and relates to the field of teaching devices.The multifunctional teaching demonstration device comprises a base, white boards, a linkage mechanism, a cleaning mechanism and a positioning mechanism, a rotating frame is rotationally arranged at the top end of the base, the white boards are symmetrically arranged in the rotating frame in a sliding mode, and the linkage mechanism is arranged in the rotating frame; the cleaning mechanisms are symmetrically arranged on the outer wall of the rotating frame, and the positioning mechanism is arranged in the rotating frame. The arrangement mode that the white boards, the linkage mechanism, the cleaning mechanism and the positioning mechanism are matched is utilized, the two white boards are arranged on the rotating frame, when one white board is lifted for use through the linkage mechanism, the other white board is descended to be stored in the rotating frame, and when frequent writing is needed, the white boards can be cleaned by removing positioning of the cleaning mechanism; and the full writing drops and is erased by the cleaning mechanism, so that the trouble of manually erasing by frequently using an eraser is avoided, the time and the physical power are saved, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of teaching devices, and particularly to a multifunctional teaching demonstration device and a teaching method thereof. Background Art

[0002] A teaching demonstration device is a visualization tool for assisting classroom teaching, which can intuitively present abstract knowledge and enhance teacher-student interaction. Traditional blackboards and projectors have their own limitations, while ordinary whiteboards, as a transitional solution, have some advantages of both.

[0003] An ordinary whiteboard teaching demonstration device usually consists of a white writing board, a marker pen, and a board eraser, supports the display of handwritten content, has no dust pollution, and can be erased and rewritten repeatedly;

[0004] However, the existing whiteboard has a simple structure. And every time the whiteboard is full and needs to be written continuously, it is necessary to use a board eraser to clean the handwriting on the whiteboard before continuing to write. When using the whiteboard, if high-frequency repeated erasing is required, simply using a board eraser to manually clean the whiteboard will undoubtedly be very laborious and affect work efficiency, which is rather inconvenient. Summary of the Invention

[0005] The purpose of the present invention is to provide a multifunctional teaching demonstration device and a teaching method thereof to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A multifunctional teaching demonstration device, comprising:

[0007] A base, on the top of which a rotating frame is rotatably provided;

[0008] A whiteboard, which is symmetrically and slidably provided inside the rotating frame;

[0009] A linkage mechanism, which is provided inside the rotating frame and is used to control the displacement of the whiteboard;

[0010] A cleaning mechanism, which is symmetrically provided on the outer wall of the rotating frame and is used to position the height of the whiteboard and clean the whiteboard;

[0011] A positioning mechanism, which is provided inside the rotating frame and is used to position the position of the rotating frame.

[0012] Preferably, the linkage mechanism includes:

[0013] A rotating rod, the end of which is rotatably inserted through the inner wall of the rotating frame;

[0014] Gears, which are equidistantly and fixedly inserted through the outside of the rotating rod;

[0015] A rack, grooves are equidistantly arranged on one side opposite to the whiteboard, the rack is fixedly installed inside the grooves, and the gear is meshed with the rack.

[0016] Preferably, the cleaning mechanism includes:

[0017] A sleeve plate, through grooves are symmetrically arranged on the outer wall of the rotating frame, and the sleeve plate is slidably inserted into the inner cavity of the through groove;

[0018] A positioning plate, the positioning plate is slidably inserted into the inner cavity of the sleeve plate, a positioning groove is arranged on the outer wall of the whiteboard, and the positioning plate is slidably inserted into the inner cavity of the positioning groove;

[0019] A cleaning head, the cleaning head is fixedly installed on the outer wall of the positioning plate through bolts for cleaning the whiteboard;

[0020] A pull rod, one end of the pull rod is fixedly connected to the positioning plate at equal intervals, and the other end of the pull rod is slidably inserted into the sleeve plate at equal intervals;

[0021] A pull plate, the pull plate is fixedly connected to the other end of the pull rod, and a pull groove is arranged at the top of the pull plate;

[0022] A first compression spring, the first compression spring is sleeved on the outside of the pull rod.

[0023] Preferably, one end of the first compression spring is fixedly connected to the positioning plate, and the other end of the first compression spring is fixedly connected to the positioning plate.

[0024] Preferably, the cleaning mechanism further includes:

[0025] Fixed blocks, the fixed blocks are fixedly connected to the top of the sleeve plate at equal intervals;

[0026] Fixed pins, counterbores are arranged on the outer walls of the fixed blocks, fixing holes are arranged on the outer wall of the rotating frame at equal intervals, and the fixed pins pass through the counterbores and are threadedly inserted into the inner cavities of the fixing holes.

[0027] Preferably, the positioning mechanism includes:

[0028] Extrusion rods, extrusion grooves are symmetrically arranged at the bottom of the rotating frame, the extrusion rods are slidably inserted into the inner walls of the extrusion grooves, and the cross section of the extrusion rods is T-shaped;

[0029] Extrusion plates, the extrusion plates are fixedly connected to the tops of the extrusion rods, and the extrusion plates cooperate with the whiteboard;

[0030] Pull springs, the pull springs are arranged in the extrusion grooves at equal intervals, one end of the pull spring is fixedly connected to the extrusion rod, and the other end of the pull spring is fixedly connected to the top end of the inner wall of the extrusion groove.

[0031] Preferably, the positioning mechanism further comprises:

[0032] An extrusion block, wherein the extrusion block is slidably disposed inside the extrusion rod;

[0033] A positioning rod, one end of which is fixedly connected to the extrusion block, and the other end of which is slidably connected to the inner wall of the extrusion groove; a positioning hole is provided at the top of the base, and the other end of one of the positioning rods is slidably connected to the inner cavity of the positioning hole;

[0034] A second compression spring is disposed inside the extrusion rod.

[0035] Preferably, one end of the second compression spring is fixedly connected to the extrusion block, and the other end of the second compression spring is fixedly connected to the top end of the inner wall of the extrusion rod.

[0036] Preferably, a ball is embedded in the bottom end of the positioning rod, and the ball is used to fit the top end of the base.

[0037] The present invention also provides a teaching method of the multifunctional teaching demonstration device, comprising the following specific use steps:

[0038] Step 1: During the teaching process, when the current whiteboard is full of writing, you can put your hand in the pull groove of the pull plate and pull the pull plate. The pull plate causes the pull rod to drive the positioning plate out of the positioning groove to release the positioning of the current whiteboard. At this time, you can press down to make the current whiteboard drop under its own gravity and the force of pressing, and the gear drives the rack to raise another clean whiteboard;

[0039] Step 2: During the process of descending and rising, the cleaning head is pressed against the outer wall of the descending whiteboard under the elastic force of the first compression spring, so that the writing on the whiteboard can be erased for next use;

[0040] Step 3: At the same time, when the current whiteboard descends to the bottom of the rotating frame, the squeezing plate can be squeezed to make the squeezing rod in a descending state. At this time, under the elastic force of the second compression spring, the ball is close to the top of the base, and the other whiteboard rises to cancel the squeezing of the squeezing plate. Under the elastic force of the tension spring, the squeezing rod drives the positioning rod to rise and disengage from the positioning hole. At this time, the rotating frame can easily rotate 180° to flip the clean whiteboard to the front. At this time, the positioning rod is above the positioning hole and completes the clamping positioning under the elastic force of the second compression spring;

[0041] Step 4: When the clean whiteboard rises to the highest point, the positioning plate on one side will automatically engage with the positioning groove under the elastic force of the first compression spring, thereby completing the positioning and continuing to use it for teaching and writing.

[0042] Technical effects and advantages of the present invention:

[0043] (1) By using the cooperation of a whiteboard, a linkage mechanism, a cleaning mechanism, and a positioning mechanism, the present invention sets two whiteboards on a rotating frame. When one whiteboard is raised for use, the other can be lowered and stored inside the rotating frame through the linkage mechanism. When frequent writing is required, by releasing the positioning of the whiteboard by the cleaning mechanism, the filled whiteboard can be lowered and wiped clean by the cleaning mechanism, while the blank whiteboard rises. At the same time, the rotating frame can rotate the blank whiteboard to the front and fix it with the positioning mechanism, avoiding the trouble of manually erasing with a board eraser frequently, saving time and physical strength, and improving work efficiency;

[0044] (2) By using the cooperation of a sleeve plate, a positioning plate, a cleaning head, a pull rod, a pull plate, and a first compression spring, under the elastic force of the first compression spring, the positioning plate can be stably engaged with the positioning groove, so as to stably position the raised whiteboard. After the whiteboard is filled with writing, the positioning plate can be pulled away from the positioning groove by the pull plate, so that the whiteboard can be lowered, and the cleaning head can be closely attached to the outer wall of the whiteboard under the elastic force of the first compression spring to erase the handwriting on it, and rise again for erasing during the next use, improving the use efficiency of the whiteboard, reducing the workload of manual erasing, and saving time and energy;

[0045] (3) By using the cooperation of an extrusion rod, an extrusion plate, a tension spring, an extrusion block, a positioning rod, and a second compression spring, with the lifting of the two whiteboards, the tension spring is no longer stretched when the whiteboard rises, so that the positioning rod can be disengaged from the positioning hole under the elastic force of the tension spring. At the same time, when the whiteboard descends, the positioning rod can be closely attached to the top of the base under the elastic force of the second compression spring, facilitating the direct positioning after the rotating frame rotates 180°, facilitating the release of positioning while replacing the whiteboard, and self-positioning after rotating the rotating frame, which is convenient for use. Brief Description of the Drawings

[0046] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0047] Figure 2 It is a schematic diagram of the internal structure of the overall side of the present invention.

[0048] Figure 3 It is a schematic diagram of the internal structure of the side of the cleaning mechanism of the present invention.

[0049] Figure 4 It is a schematic diagram of the structure of the gear of the present invention.

[0050] Figure 5 It is a schematic diagram of the structure of the positioning mechanism of the present invention.

[0051] Figure 6 For the present invention Figure 5 Schematic enlarged view of the structure at position A in the present invention.

[0052] In the figure: 1, base; 2, rotating frame; 3, whiteboard; 4, linkage mechanism; 41, rotating rod; 42, gear; 43, rack; 5, cleaning mechanism; 51, sleeve plate; 52, positioning plate; 53, cleaning head; 54, pull rod; 55, pull plate; 56, first compression spring; 57, fixed block; 58, fixed pin; 6, positioning mechanism; 61, extrusion rod; 62, extrusion plate; 63, tension spring; 64, extrusion block; 65, positioning rod; 66, second compression spring; 67, ball. Specific embodiments

[0053] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0054] The present invention provides a multifunctional teaching demonstration device as shown in Figures 1-6 the figure, including a base 1, a whiteboard 3, a linkage mechanism 4, a cleaning mechanism 5 and a positioning mechanism 6. A rotating frame 2 is rotatably provided at the top of the base 1. The whiteboards 3 are symmetrically and slidably provided inside the rotating frame 2. The linkage mechanism 4 is provided inside the rotating frame 2 for controlling the displacement of the whiteboard 3. The cleaning mechanisms 5 are symmetrically provided on the outer wall of the rotating frame 2 for positioning the height of the whiteboard 3 and cleaning the whiteboard 3. The positioning mechanism 6 is provided inside the rotating frame 2 for positioning the position of the rotating frame 2. By providing two whiteboards 3 on the rotating frame 2, when one is raised for use, the other can be lowered and stored inside the rotating frame 2 through the linkage mechanism 4. Thus, when frequent writing is required, by releasing the positioning of the whiteboard 3 by the cleaning mechanism 5, the full-written whiteboard can be lowered and wiped clean by the cleaning mechanism 5, while the blank one is raised. At the same time, the rotating frame 2 can rotate the blank one to the front and fix it by the positioning mechanism 6, avoiding the trouble of manually erasing with an eraser frequently, saving time and physical strength, and improving work efficiency.

[0055] Specifically, the linkage mechanism 4 includes a rotating rod 41, a gear 42 and a rack 43. The end of the rotating rod 41 is rotatably connected with the inner wall of the rotating frame 2, and the gear 42 is fixedly connected to the outside of the rotating rod 41 at equal intervals. Grooves are equidistantly provided on the opposite side of the whiteboard 3, and the rack 43 is fixedly installed inside the groove. The gear 42 is meshed with the rack 43. After the cleaning mechanism 5 releases the positioning of the whiteboard 3 in the raised position, the whiteboard 3 can be pressed downward under its own gravity and the force of pressing, and the rack 43 is driven by the gear 42 to lift another clean whiteboard 3, thereby improving the use efficiency of the whiteboard 3, reducing the workload of manual erasing, and saving time and energy.

[0056] Specifically, the cleaning mechanism 5 includes a sleeve plate 51, a positioning plate 52, a cleaning head 53, a pull rod 54, a pull plate 55 and a first compression spring 56. The outer wall of the rotating frame 2 is symmetrically provided with through grooves, the sleeve plate 51 is slidably and interlacedly connected with the inner cavity of the through groove, the positioning plate 52 is slidably and interlacedly connected with the inner cavity of the sleeve plate 51, the outer wall of the whiteboard 3 is provided with a positioning groove, the positioning plate 52 is slidably and interlacedly connected with the inner cavity of the positioning groove, the cleaning head 53 is fixedly installed on the outer wall of the positioning plate 52 by bolts, and is used to clean the whiteboard 3. The cleaning head 53 can erase the writing on the whiteboard 3, one end of the pull rod 54 is equidistantly fixedly connected with the positioning plate 52, the other end of the pull rod 54 is equidistantly and interlacedly connected with the sleeve plate 51, the pull plate 55 is fixedly connected to the other end of the pull rod 54, and a pull groove is provided on the top of the pull plate 55. The opening of the pull groove is not only convenient for pulling the pull rod 54 at any time, but also makes it convenient for The pull rod 54 drives the positioning plate 52 to disengage from the positioning groove, releasing the positioning of the whiteboard 3, and can also serve as a storage groove to store items such as pens for writing on the whiteboard 3. The first compression spring 56 is sleeved on the outside of the pull rod 54, one end of the first compression spring 56 is fixedly connected to the positioning plate 52, and the other end of the first compression spring 56 is fixedly connected to the positioning plate 52. The first compression spring 56 is always in a compressed state, thereby providing a stable elastic force to the positioning plate 52, so that the positioning plate 52 can be stably engaged with the positioning groove, thereby fixing the whiteboard 3 in an ascending state, which is convenient for writing, and after the positioning is released, the cleaning head 53 on the positioning plate 52 will be close to the outer wall of the descending whiteboard 3 under the elastic force of the first compression spring 56, so that the handwriting written thereon can be erased for the next use.

[0057] Furthermore, the cleaning mechanism 5 also includes a fixing block 57 and a fixing pin 58. The fixing block 57 is equidistantly fixedly connected to the top of the sleeve plate 51. The outer wall of the fixing block 57 is provided with countersunk holes, and the outer wall of the rotating frame 2 is equidistantly provided with fixing holes. The fixing pin 58 passes through the countersunk holes and is threadedly connected with the inner cavity of the fixing hole. The sleeve plate 51 can be installed and fixed by the fixing pin 58, and can also be removed and replaced after the service life of the cleaning head 53 is exhausted, which is convenient for use.

[0058] Specifically, the positioning mechanism 6 includes a pressing rod 61, a pressing plate 62, a tension spring 63, a pressing block 64, a positioning rod 65 and a second compression spring 66. Extrusion grooves are symmetrically formed at the bottom of the rotating frame 2. The pressing rod 61 is slidably inserted into the inner wall of the extrusion groove. The cross-section of the pressing rod 61 is T-shaped. The pressing plate 62 is fixedly connected to the top end of the pressing rod 61. The pressing plate 62 cooperates with the whiteboard 3. The tension springs 63 are equidistantly arranged inside the extrusion groove. One end of the tension spring 63 is fixedly connected to the pressing rod 61. The pressing block 64 is slidably arranged inside the pressing rod 61. One end of the positioning rod 65 is fixedly connected to the pressing block 64. The other end of the positioning rod 65 is slidably inserted into the inner wall of the extrusion groove. A positioning hole is formed at the top end of the base 1. The other end of one of the positioning rods 65 is slidably inserted into the inner cavity of the positioning hole. The second compression spring 66 is arranged inside the pressing rod 61. One end of the second compression spring 66 is fixedly connected to the pressing block 64. The other end of the second compression spring 66 is fixedly connected to the top end of the inner wall of the pressing rod 61. The other end of the tension spring 63 is fixedly connected to the top end of the inner wall of the extrusion groove. The tension spring 63 always provides a stable upward elastic force to the pressing rod 61, so that when the whiteboard 3 does not press the pressing plate 62, the pressing plate 62 can be in a rising state. At this time, the positioning rod 65 is suspended above the base 1. When the whiteboard 3 descends, the pressing plate 62 can be pressed. At this time, the pressing rod 61 will descend, so that the positioning rod 65 closely adheres to the surface of the base 1 under the elastic force of the second compression spring 66. At this time, when the rotating frame 2 rotates to the position of the positioning hole, the positioning rod 65 can be inserted into the positioning hole, so as to position the rotating frame 2.

[0059] Further, a ball 67 is embedded at the bottom end of the positioning rod 65. The ball 67 is used to fit the top end of the base 1. The ball 67 can reduce the friction between the positioning rod 65 and the base 1 and extend the service life of the positioning rod 65.

[0060] The teaching method of the present invention:

[0061] Step 1: During the teaching process, when the current whiteboard 3 is full of writing, the hand can be placed in the pulling groove formed in the pulling plate 55 to pull the pulling plate 55. The pulling plate 55 causes the pulling rod 54 to drive the positioning plate 52 to disengage from the positioning groove, releasing the positioning of the current whiteboard 3. At this time, by pressing down, the current whiteboard 3 can descend under its own gravity and the pressing force, and drive the rack 43 through the gear 42 to raise another clean whiteboard 3;

[0062] Step 2: During this descending and ascending process, the cleaning head 53 closely adheres to the outer wall of the descending whiteboard 3 under the elastic force of the first compression spring 56, so as to erase the handwriting written on it for the next use;

[0063] Step 3: Meanwhile, when the current whiteboard 3 descends to the bottom of the rotating frame 2, the pressing plate 62 can be pressed, causing the pressing rod 61 to descend. At this time, under the elastic force of the second compression spring 66, the ball 67 closely adheres to the top of the base 1, while the other whiteboard 3 rises to cancel the pressing on the pressing plate 62. Under the elastic force of the tension spring 63, the pressing rod 61 drives the positioning rod 65 to rise and disengages from the positioning hole. At this time, the rotating frame 2 can easily rotate 180° to flip the clean whiteboard 3 to the front. At this time, the positioning rod 65 is above the positioning hole and completes the clamping and positioning under the elastic force of the second compression spring 66;

[0064] Step 4: When the clean whiteboard 3 rises to the highest position, the positioning plate 52 on one side of it will automatically engage with the positioning groove under the elastic force of the first compression spring 56, thereby completing the positioning and continuing to be used for teaching and writing.

[0065] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-functional teaching demonstration device, characterized in that, Including: A base (1), and a rotating frame (2) is rotatably arranged at the top end of the base (1); A whiteboard (3), and the whiteboard (3) is symmetrically and slidably arranged inside the rotating frame (2); A linkage mechanism (4), which is arranged inside the rotating frame (2) and is used to control the displacement of the whiteboard (3); A cleaning mechanism (5), which is symmetrically arranged on the outer wall of the rotating frame (2) and is used to position the height of the whiteboard (3) and clean the whiteboard (3); A positioning mechanism (6), which is arranged inside the rotating frame (2) and is used to position the position of the rotating frame (2).

2. The multifunctional teaching demonstration device according to claim 1, wherein, The linkage mechanism (4) includes: A rotating rod (41), and the end of the rotating rod (41) is rotatably inserted and connected to the inner wall of the rotating frame (2); Gears (42), which are equidistantly and fixedly inserted and connected to the outside of the rotating rod (41); Racks (43), grooves are equidistantly formed on the opposite sides of the whiteboard (3), and the racks (43) are fixedly installed inside the grooves, and the gears (42) are meshed with the racks (43).

3. A multi-functional teaching demonstration device according to claim 1, characterized in that, The cleaning mechanism (5) includes: A sleeve plate (51), through grooves are symmetrically formed on the outer wall of the rotating frame (2), and the sleeve plate (51) is slidably inserted and connected to the inner cavity of the through groove; A positioning plate (52), which is slidably inserted and connected to the inner cavity of the sleeve plate (51), a positioning groove is formed on the outer wall of the whiteboard (3), and the positioning plate (52) is slidably inserted and connected to the inner cavity of the positioning groove; A cleaning head (53), which is fixedly installed on the outer wall of the positioning plate (52) by bolts and is used to clean the whiteboard (3); A pull rod (54), one end of the pull rod (54) is equidistantly fixedly connected to the positioning plate (52), and the other end of the pull rod (54) is equidistantly slidably inserted and connected to the sleeve plate (51); A pull plate (55), which is fixedly connected to the other end of the pull rod (54), and a pull groove is formed at the top end of the pull plate (55); A first compression spring (56), which is sleeved on the outside of the pull rod (54).

4. A multifunctional teaching demonstration device according to claim 3, characterized in that, One end of the first compression spring (56) is fixedly connected to the positioning plate (52), and the other end of the first compression spring (56) is fixedly connected to the positioning plate (52).

5. A multifunctional teaching demonstration device according to claim 3, characterized in that, The cleaning mechanism (5) further includes: Fixed blocks (57), which are equidistantly fixedly connected to the top end of the sleeve plate (51); Fixed pins (58), counter bores are formed on the outer walls of the fixed blocks (57), fixing holes are equidistantly formed on the outer wall of the rotating frame (2), and the fixed pins (58) pass through the counter bores and are threadedly inserted and connected to the inner cavities of the fixing holes.

6. A multifunctional teaching demonstration device according to claim 1, characterized in that, The positioning mechanism (6) includes: Extrusion rods (61), extrusion grooves are symmetrically formed at the bottom of the rotating frame (2), the extrusion rods (61) are slidably inserted and connected to the inner walls of the extrusion grooves, and the cross section of the extrusion rods (61) is T-shaped; Extrusion plates (62), which are fixedly connected to the top ends of the extrusion rods (61), and the extrusion plates (62) cooperate with the whiteboard (3); A tension spring (63) is equidistantly arranged inside the extrusion groove, one end of the tension spring (63) is fixedly connected to the extrusion rod (61), and the other end of the tension spring (63) is fixedly connected to the top end of the inner wall of the extrusion groove.

7. A multifunctional teaching demonstration device according to claim 6, characterized in that, The positioning mechanism (6) further comprises: An extrusion block (64), wherein the extrusion block (64) is slidably disposed inside the extrusion rod (61); A positioning rod (65), one end of which is fixedly connected to the extrusion block (64), and the other end of which is slidably connected to the inner wall of the extrusion groove; a positioning hole is provided at the top of the base (1), and the other end of which is slidably connected to the inner cavity of the positioning hole; A second compression spring (66), wherein the second compression spring (66) is arranged inside the extrusion rod (61).

8. A multifunctional teaching demonstration device according to claim 7, wherein, One end of the second compression spring (66) is fixedly connected to the extrusion block (64), and the other end of the second compression spring (66) is fixedly connected to the top end of the inner wall of the extrusion rod (61).

9. A multifunctional teaching demonstration device according to claim 7, characterized in that, A ball (67) is embedded in the bottom end of the positioning rod (65), and the ball (67) is used to fit the top end of the base (1).

10. A teaching method for a multi-functional teaching demonstration device according to any one of claims 1-9, characterized in that, The specific usage steps are as follows: Step 1: During the teaching process, after the current whiteboard (3) is fully written, the hand can be placed in the pull groove formed by the pull plate (55) to pull the pull plate (55), so that the pull rod (54) drives the positioning plate (52) to disengage from the positioning groove, thereby releasing the positioning of the current whiteboard (3). At this time, the current whiteboard (3) can be pressed downward to make it fall under its own gravity and the force of the pressure, and the gear (42) drives the rack (43) to raise another clean whiteboard (3); Step 2: During the process of descending and ascending, the cleaning head (53) is pressed against the outer wall of the descending whiteboard (3) under the elastic force of the first compression spring (56), so that the writing on the whiteboard can be erased for the next use; Step 3: At the same time, when the current whiteboard (3) descends to the bottom of the rotating frame (2), the squeezing plate (62) can be squeezed to make the squeezing rod (61) in a descending state. At this time, under the elastic force of the second compression spring (66), the ball (67) is close to the top of the base (1), and the other whiteboard (3) rises to cancel the squeezing of the squeezing plate (62). Under the elastic force of the tension spring (63), the squeezing rod (61) drives the positioning rod (65) to rise and disengage from the positioning hole. At this time, the rotating frame (2) can easily rotate 180° to flip the clean whiteboard (3) to the front. At this time, the positioning rod (65) is above the positioning hole and is clamped and positioned under the elastic force of the second compression spring (66); Step 4: When the clean whiteboard (3) rises to the highest point, the positioning plate (52) on one side thereof will automatically engage with the positioning groove under the elastic force of the first compression spring (56), thereby completing the positioning and continuing to use for teaching and writing.

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