Preschool education teaching demonstration device

Abstract

The invention belongs to the technical field of teaching equipment, and particularly discloses a preschool education teaching demonstration device which comprises a plurality of hanging columns arranged on the upper portion of a containing groove, a function board hung on the hanging columns and located in front of a television and four long board box bodies arranged on the periphery of the containing groove. A first rotating shaft arranged on the rotating piece is rotationally connected with shaft supports arranged at the two ends of each side of the containing groove, a power assembly is arranged on the first rotating shaft, an opening is formed in the side wall, facing the function plate, of the long plate box body when the long plate box body is tightened, a liquid storage groove is formed in the position, inside the long plate box body, of the edge of the opening, and a long plate electromagnet is slidably arranged in the liquid storage groove; and self-adaptive cooperative locking assemblies are symmetrically arranged at the two ends of the long plate box body. The clamping component injected with the magnetic fluid is driven through the automatic tightening structure, flexible wrapping and accurate attaching of the edge of the function plate are achieved, self-adaptive locking with the function plate is achieved through magnetic fluid curing, and the fixing stability and the universality for diversified function plates are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of teaching equipment, and specifically refers to a pre-school education teaching demonstration device. Background Art

[0002] In current pre-school education practices, in order to stimulate children's learning interests and cultivate their multiple intelligences, various teaching media and tools are usually used in the center of the podium during teaching. For example, teaching videos, pictures and animations are played on a large-screen TV; traditional blackboard tools (blackboard with chalk) are used to explain concepts; in addition, to cultivate children's hands-on ability and artistic accomplishment, painting and graffiti tools (special teaching drawing boards with colored markers) and various magnetic teaching aids (magnetic boards with letter, number, and pattern magnetic tiles) and physical operation teaching aids (plug-in boards with plug-in building blocks, etc.) also play an indispensable role.

[0003] In recent years, large-size liquid crystal displays have gradually become the core display devices in pre-school education teaching areas and are usually placed in prominent positions in the center of the podium. The large-size display device itself occupies the main visual focus and physical space. If other types of teaching boards are to be added around or in front of it, space conflicts or integration difficulties are often encountered. To solve the above problems, some solutions have emerged in the prior art.

[0004] A common solution is to adopt a push-pull or sliding integrated structure, where one or more teaching boards are installed on rails through pulleys so that they can be pushed to the front of the display device or moved away. It usually has the following defects: firstly, this structure can often only integrate teaching boards with relatively single functions and is difficult to be compatible with various different types of teaching board surfaces; secondly, the overall structure may be relatively large and occupy more horizontal or vertical space; finally, its mechanical stability and durability may be insufficient, and there is a risk of shaking, jamming or even derailing after long-term use.

[0005] Another solution is to adopt independent, movable teaching units. For example, different teaching boards are respectively installed on base brackets with rollers. During use, they are pushed to the podium area. Although this solution has a certain degree of flexibility in function switching, it also has obvious deficiencies: multiple independent teaching units will occupy a large amount of storage and passage space; during the process of pushing, positioning and using these movable units, their stability cannot be fully guaranteed, and there are also safety hazards.

[0006] Based on the above defects, there are also technical attempts to set clamping and fixing devices on the side or frame of the display device to temporarily hang and fix teaching boards with different functions in front of the display device. Although these teaching boards can be designed to roughly match the fixing devices in terms of planar dimensions, due to their different functions (for example, writing boards are usually thinner, while building block assembly boards or painting boards with special coatings may have a certain thickness), there must be differences in the thickness dimensions of these function display boards. This makes it difficult for a single-specification fixing device to achieve a tight, stable, and reliable fixation for all function boards with different thicknesses, and they are prone to shaking or even falling off. Summary of the Invention

[0007] In view of the above situation, the present invention provides a preschool education teaching demonstration device. By driving a clamping component filled with ferrofluid through an automatic tightening structure, it realizes the flexible wrapping and precise fitting of the edge of the function board. Through the solidification of the ferrofluid, it realizes the adaptive locking that perfectly matches the thickness and contour of the board, solves the problems of being sensitive to the board thickness and poor fixation of the traditional fixing method, and significantly improves the stability of the fixation and the universality for various function boards.

[0008] The technical solution adopted by the present invention is as follows: The present invention provides a preschool education teaching demonstration device, including a placement groove and a TV. The bottom of the placement groove is fixedly arranged close to the wall surface, the TV is fixed in the placement groove, and it further includes a plurality of hanging posts arranged at the upper part of the placement groove, a function board hanging on the hanging posts and located in front of the TV, and four long board boxes arranged around the placement groove. Rotating parts are provided at both ends of the long board box, and a first rotating shaft provided on the rotating part is rotationally connected to the shaft supports arranged at both ends of each side of the placement groove. A power component is provided on the first rotating shaft to synchronously drive all the long board boxes to expand and tighten in a petal shape. When the long board boxes are tightened, they surround the periphery of the function board. An opening is provided on the side wall facing the function board when the long board boxes are tightened, and a liquid storage groove is provided inside the long board box at the edge of the opening. A long board electromagnet is slidably arranged in the liquid storage groove.

[0009] Furthermore, adaptive collaborative locking components are symmetrically arranged at both ends of the long board box. The adaptive collaborative locking components include a plurality of support parts. The support parts on the placement groove and the support parts outside the long board box are linked through a gear set. The support parts outside the long board box and the support parts inside the long board box are linked through a sprocket set. The support parts inside the long board box and the long board electromagnet are linked through a rack set.

[0010] Further, the gear set includes a first gear, a second rotating shaft and a second gear. The first gear is fixedly arranged on the support member of the placement groove. The first gear is coaxially arranged with the first rotating shaft on the rotating member. The second rotating shaft is rotatably engaged on the support member outside the long plate box body. The second gear is coaxially arranged on the second rotating shaft. The second gear makes a planetary meshing movement around the first gear.

[0011] Further, the sprocket set includes a first sprocket, a second sprocket and a chain. The first sprocket is coaxially arranged on the second rotating shaft and rotates synchronously with the second gear. The second sprocket is rotatably engaged on the support member inside the long plate box body. The chain is arranged in cooperation with the first sprocket and the second sprocket.

[0012] Further, the rack set includes a third gear and a linkage rack. The third gear is coaxially and fixedly connected with the second sprocket. The linkage rack is arranged on the side of the long plate electromagnet facing away from the opening. The linkage rack is meshed and connected with the third gear. The third gear is located between the linkage rack and the second gear.

[0013] Further, the power assembly includes bevel gears. The bevel gears are coaxially arranged on the first rotating shaft. The bevel gears on two adjacent first rotating shafts at a corner of the placement groove are vertically meshed and connected. Protective covers are arranged on adjacent two shaft supports to cover the bevel gears. A self-locking motor is arranged on one of the protective covers. The output end of the self-locking motor is coaxially and fixedly connected with one of the bevel gears.

[0014] Further, an elastic film body is arranged on the opening to close the opening. The closed space formed by the elastic film body, the liquid storage tank and the long plate electromagnet is filled with magnetic fluid.

[0015] Further, a limiting plate is arranged on the side wall of the placement groove. When the long plate box body is fully unfolded, it is parallel to the wall surface and blocked by the limiting plate. When the long plate box body is fully retracted, it is perpendicular to the wall surface and blocked by the side wall of the placement groove.

[0016] Further, a power adapter is arranged inside the long plate box body. The power adapter is electrically connected with the long plate electromagnet.

[0017] Further, when the long plate box body is fully unfolded, the elastic film body is in an initial unexpanded state. When the long plate box body is fully retracted, the elastic film body is pushed open and protruded by the extended long plate electromagnet and the magnetic fluid, and then wraps the two sides of the edge of the function plate.

[0018] The beneficial effects achieved by the present invention with the above structure are as follows: (1) Aiming at the problem that the fixing device in the prior art is sensitive to the thickness of the functional board and it is difficult to firmly fix all functional boards with different thicknesses, when the long board box body is tightened in the present invention, the adaptive cooperative locking component inside it drives the long board electromagnet, so that the elastic membrane body connecting the magnetic fluid can flexibly wrap and precisely fit the edge of any thickness functional board. Subsequently, when the long board electromagnet is energized, the magnetic fluid solidifies, forming a customized lock that perfectly matches the edge contour of the functional board, thereby ensuring a tight and extremely stable fixation for various thickness functional boards, effectively avoiding shaking or falling off, and its application to diverse teaching in preschool education.

[0019] (2) Aiming at the problems that the existing push-pull structure may have a large overall structure, occupy more space, and the independent moving units occupy a large amount of storage and passage space, the four long board box bodies of the present invention can be fully unfolded parallel to the wall when the functional board is not in use, minimizing the occupation of the teaching space. Its petal-shaped tightening movement mode is also more compact than the traditional linear push-pull. More importantly, the locking is achieved through the solid-liquid conversion of the magnetic fluid, rather than purely relying on traditional mechanical push-pull or clamping, thereby improving the long-term use stability and durability of the device.

[0020] (3) In the present invention, the teacher only needs to control through simple start-stop operations. The initial placement of the functional board only needs to be hung on the hanging column, and the subsequent clamping and fixing are automatically completed by the adaptive cooperative locking component linking the long board electromagnet and the magnetic fluid, without the need for manual complex alignment or locking operations. Similarly, releasing the functional board only needs to turn off the long board electromagnet and reverse-start the self-locking motor. The whole process has a high degree of automation, greatly simplifies the teacher's operation steps, and improves the efficiency of teaching preparation and switching. Description of the Drawings

[0021] Figure 1 It is a three-dimensional structure schematic diagram of a preschool education teaching demonstration device proposed by the present invention.

[0022] Figure 2 It is an exploded structure schematic diagram of a preschool education teaching demonstration device proposed by the present invention.

[0023] Figure 3 It is a front view of a preschool education teaching demonstration device proposed by the present invention.

[0024] Figure 4 It is a side view of a preschool education teaching demonstration device proposed by the present invention.

[0025] Figure 5 It is a structure schematic diagram of the placement groove of a preschool education teaching demonstration device proposed by the present invention.

[0026] Figure 6Explosion structure schematic diagram of the positional relationship between the power component and the protective cover of a preschool education teaching demonstration device proposed by the present invention.

[0027] Figure 7 For Figure 6 A - A cross - sectional view in [].

[0028] Figure 8 Structure schematic diagram of the adaptive collaborative locking component of a preschool education teaching demonstration device proposed by the present invention.

[0029] Figure 9 For Figure 8 Enlarged view of part B in [].

[0030] Figure 10 Motion trajectory diagram of the long - board box body of a preschool education teaching demonstration device proposed by the present invention.

[0031] Among them, 1. Placing groove, 11. Axle support, 12. Limiting plate, 13. Hanging column, 2. Television, 3. Function board, 4. Long - board box body, 41. Rotating part, 42. First rotating shaft, 43. Opening, 44. Liquid storage tank, 45. Power adapter, 46. Elastic membrane body, 5. Adaptive collaborative locking component, 51. Support part, 52. First gear, 53. Second gear, 531. Second rotating shaft, 54. First sprocket, 55. Chain, 56. Second sprocket, 57. Third gear, 58. Linkage rack, 59. Long - board electromagnet, 6. Power component, 61. Bevel gear, 62. Protective cover, 63. Self - locking motor.

[0032] The attached drawings are used to provide further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the attached 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 of 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 belong to the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the attached drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0035] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 shown, the present invention proposes a preschool education teaching demonstration device, including a placement groove 1, a TV 2, a function board 3, four long board boxes 4, an adaptive collaborative locking component 5, and a power component 6.

[0036] The bottom of the placement groove 1 is designed to be fixedly arranged close to the wall to ensure the stability of the overall device. The TV 2 is fixedly installed in the placement groove 1 and serves as the main teaching display device. To facilitate hanging different types of function boards 3, at least two hanging posts 13 are provided at the upper part of the placement groove 1. The function board 3 (such as a blackboard, a whiteboard, a magnetic board, a building block assembly board, etc.) is hung on the hanging posts 13 through openings or hooks at its upper edge, so that the function board 3 is located in front of the TV 2 and maintains a certain interval from the TV 2 to avoid direct contact.

[0037] Four long board boxes 4 are arranged around the placement groove 1. Specifically, rotating members 41 are provided at both ends of each long board box 4. The first rotating shaft 42 provided on the rotating member 41 is rotatably connected to the shaft supports 11 provided at both ends of each side of the placement groove 1. This setting enables the four long board boxes 4 to rotate around the first rotating shaft 42 as the axis. A power component 6 is provided on the first rotating shaft 42 to synchronously drive all four long board boxes 4 to rotate around their respective first rotating shafts 42, realizing an action similar to petal-like inward contraction or outward expansion. When the long board boxes 4 contract, they surround the edge part of the function board 3 from all around.

[0038] To achieve the clamping and fixing of the edge of the function board 3, each long board box 4 is provided with an opening 43 on the side wall facing the function board 3 when it contracts. A liquid storage tank 44 is connected to the edge of the opening 43 inside the long board box 4. A long board electromagnet 59 is slidably provided in the liquid storage tank 44.

[0039] To achieve the precise movement of the long board electromagnet 59 and the adaptive locking of the function board 3, adaptive collaborative locking components 5 are symmetrically provided at both ends of the long board box 4. The adaptive collaborative locking component 5 includes a plurality of support members 51. Specifically, the support members 51 on the placement groove 1 and the support members 51 outside the long board box 4 are linked through a gear set; the support members 51 outside the long board box 4 and the support members 51 inside the long board box 4 are linked through a sprocket set; the support members 51 inside the long board box 4 and the long board electromagnet 59 are linked through a rack set.

[0040] The gear set includes a first gear 52, a second rotating shaft 531, and a second gear 53. The first gear 52 is fixedly arranged on the support member 51 of the placement groove 1, and the first gear 52 is coaxially arranged with the first rotating shaft 42 on the rotating member 41 of the corresponding long plate box body 4. The second rotating shaft 531 is rotatably engaged on the support member 51 outside the long plate box body 4, and the second gear 53 is coaxially fixed on the second rotating shaft 531. When the long plate box body 4 rotates around the first rotating shaft 42, since the first gear 52 is fixed and the relative position of the second gear 53 and the long plate box body 4 through the support member 51 remains unchanged, the second gear 53 will perform a planetary meshing motion around the fixed first gear 52, and at the same time, the second gear 53 itself will also rotate.

[0041] The sprocket set includes a first sprocket 54, a second sprocket 56, and a chain 55. The first sprocket 54 is coaxially fixed on the second rotating shaft 531, so it will rotate synchronously with the second gear 53. The second sprocket 56 is rotatably engaged on the support member 51 inside the long plate box body 4, and the chain 55 is tensioned and arranged on the first sprocket 54 and the second sprocket 56 to transmit the rotation of the first sprocket 54 to the second sprocket 56.

[0042] The rack set includes a third gear 57 and a linkage rack 58. The third gear 57 is coaxially fixedly connected to the second sprocket 56, so it will rotate synchronously with the second sprocket 56. The linkage rack 58 is arranged on the side of the long plate electromagnet 59 facing away from the opening 43, and the linkage rack 58 is meshed with the third gear 57. In particular, the third gear 57 is located between the linkage rack 58 and the second gear 53. This setting logic ensures that during the tightening process of the long plate box body 4, the planetary motion and self-rotation of the second gear 53 are transmitted to the third gear 57 through the sprocket set, and the rotation of the third gear 57 further drives the linear motion of the linkage rack 58, thereby pushing the long plate electromagnet 59 towards the opening 43.

[0043] The power assembly 6 is used to drive the synchronous opening and closing of the long plate box body 4. Specifically, the power assembly 6 includes a plurality of bevel gears 61. Each bevel gear 61 is coaxially arranged on the first rotating shaft 42 of the corresponding long plate box body 4. The bevel gears 61 on two adjacent first rotating shafts 42 at a corner of the placement groove 1 are arranged to be perpendicularly meshed and connected. In this way, when one first rotating shaft 42 rotates, it can drive the adjacent first rotating shaft 42 to rotate through the meshing of the bevel gears 61, thereby realizing the synchronous movement of the four long plate box bodies 4. For safety and aesthetics, protective covers 62 are provided on two adjacent shaft supports 11 to cover the meshed bevel gears 61. A self-locking motor 63 is provided on one of the protective covers 62, and the output end of the self-locking motor 63 is coaxially fixedly connected to one of the bevel gears 61. As a practice of the existing conventional technology, the self-locking motor 63 can automatically and firmly lock its output shaft when it stops, preventing the long plate box body 4 from accidentally shaking and ensuring the stability of the state switch.

[0044] To achieve flexible wrapping of the edge of the functional board 3 and magnetic fluid curing and locking, an elastic membrane body 46 is provided on the opening 43 of the long board box body 4. The elastic membrane body 46 seals the opening 43. The elastic membrane body 46 is usually preferably made of a material with high elasticity, chemical corrosion resistance and wear resistance, such as silicone rubber or special polyurethane elastomer, for sealing the magnetic fluid and achieving flexible wrapping of the edge of the functional board 3. The elastic membrane body 46, the liquid storage tank 44 and the long board electromagnet 59 together form a closed space, and this closed space is pre-filled with magnetic fluid. Magnetic fluid is a smart material that can change its rheological properties under the action of a magnetic field.

[0045] To standardize the movement range of the long board box body 4, a limiting plate 12 is provided on the side wall of the placement groove 1. When the long board box body 4 is fully unfolded, it will be parallel to the wall surface and blocked by the limiting plate 12 to prevent excessive unfolding. When the long board box body 4 is fully tightened, it will be perpendicular to the wall surface and blocked by the side wall of the placement groove 1 to ensure that it accurately reaches the closed position.

[0046] To supply power to the long board electromagnet 59, a power adapter 45 is provided inside the long board box body 4. The power adapter 45 is electrically connected to the long board electromagnet 59 and is used to convert the external power supply into a voltage and current suitable for the operation of the long board electromagnet 59.

[0047] When the long board box body 4 is fully unfolded, the elastic membrane body 46 is in its initial, unexpanded state. When the long board box body 4 is tightened and the adaptive cooperative locking component 5 drives the long board electromagnet 59 to move towards the opening 43, the long board electromagnet 59 will squeeze the magnetic fluid in the closed space, causing the magnetic fluid to push the elastic membrane body 46 to bulge outwards. Since the elastic membrane body 46 has elasticity, its bulging part can flexibly adapt to and wrap the front and back sides of the edge of the functional board 3, achieving precise fitting without being affected by the thickness of the functional board 3 and the slight differences in the edge contour.

[0048] The working process of this device is as follows: First, fix the placement groove 1 on the wall surface at the center of the podium and fixedly install the TV 2 in the placement groove 1. When the teacher needs to use the TV 2 for teaching, the four long board box bodies 4 are in a fully unfolded state, parallel to the wall surface, and are blocked and positioned by the limiting plate 12, and at this time, the screen of the TV 2 will not be blocked. When the functional board 3 needs to be used, the teacher first hangs the selected functional board 3 on the hanging post 13 above the placement groove 1 to complete the preliminary placement of the functional board 3. At this time, the functional board 3 is located directly in front of the TV 2 and keeps a certain interval from the TV 2. Subsequently, turn on the self-locking motor 63. The output shaft of the self-locking motor 63 rotates to drive the bevel gear 61 coaxially connected to it to rotate. The rotation of this bevel gear 61 drives the first rotating shaft 42 of the adjacent long board box body 4 to rotate through another bevel gear 61 that meshes vertically, and so on, to achieve synchronous flipping of all four long board box bodies 4 towards the direction of the functional board 3, presenting a movement trajectory similar to the tightening of petals.

[0049] The second gear 53 is fixed on the support member 51 on the placement groove 1, and the second gear 53 is fixed on the support member 51 on the placement groove 1. The second gear 53 is fixed on the relative position of the outer support member 51 of the long board box body 4, and the second gear 53 itself rotates. The rotation of the second gear 53 is transmitted to the second sprocket 56 through the first sprocket 54 and the chain 55, driving the second sprocket 56 to rotate. The third gear 57 coaxially fixed with the second sprocket 56 rotates accordingly and meshes with the linkage rack 58 provided on the back of the long board electromagnet 59. During the tightening of the long board box body 4, the rotation of the third gear 57 drives the linkage rack 58, thereby pushing the long board electromagnet 59 to move in the direction of the elastic membrane body 46, thereby squeezing the magnetic fluid in the liquid storage tank 44, and the magnetic fluid then pushes and stretches the elastic membrane body 46 outward to make it convex.

[0050] When the four long board boxes 4 are fully tightened and blocked by the side walls of the placement slot 1 and no longer move further, the self-locking motor 63 can be controlled to automatically stop rotating and self-lock by detecting the change in resistance through a preset stroke constraint (such as a limit switch) or a torque sensor. At this time, the elastic membrane 46 protruded by the magnetic fluid has tightly and adaptively wrapped the front and back sides of all edges of the functional board 3, achieving a perfect fit with the edge contour of the functional board 3. Turn on the power, and the power adapter 45 supplies power to the long board electromagnet 59 to generate a magnetic field. Under the action of the magnetic field, the magnetic fluid surrounding the edge of the functional board 3 quickly solidifies. The magnetic fluid is also called magnetorheological fluid. Under the action of the magnetic field, the internal magnetic particles will quickly arrange into a chain structure, causing the liquid viscosity to increase dramatically, and change from a flow-like state to a solid-like state, thereby firmly locking the functional board 3 in the current position. Due to the flexible wrapping and solidification characteristics of the magnetic fluid, even functional boards 3 with different thicknesses or imperfect edges can be stably and reliably fixed.

[0051] When the function board 3 needs to be removed, first turn off the power supply of the long board electromagnet 59 to demagnetize it, and the magnetic fluid will resume its fluid state after losing the magnetic field. Then turn on the self-locking motor 63 in the reverse direction, and the self-locking motor 63 drives the bevel gear 61 to rotate in the reverse direction, so that the four long board boxes 4 are synchronously unfolded outward. During the unfolding of the long board boxes 4, the linkage mechanism of the adaptive cooperative locking assembly 5 also moves in the reverse direction, so that the long board electromagnet 59 retracts into the inside of the long board box 4, and the elastic membrane 46 gradually returns to its initial unexpanded state under the action of its own elasticity and the reflux of the magnetic fluid. Finally, when the four long board boxes 4 are fully unfolded and blocked by their respective limit plates 12, the self-locking motor 63 automatically stops and self-locks. At this time, the teacher can easily remove the function board 3 from the hanging column 13.

[0052] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention.

[0054] The above description of the present invention and its embodiments is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the purpose of the present invention, design similar structural modes and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A preschool education teaching demonstration device, comprising a placement groove (1) and a television (2), wherein the bottom of the placement groove (1) is fixedly arranged in close contact with the wall surface, and the television (2) is fixed in the placement groove (1), characterized in that: It further includes a plurality of hanging posts (13) provided above the placement groove (1), a function board (3) hanging on the hanging posts (13) and located in front of the television (2), and four long board boxes (4) provided on the periphery of the placement groove (1). Rotating members (41) are provided at both ends of the long board box (4), and a first rotating shaft (42) provided on the rotating member (41) is rotatably connected to shaft supports (11) provided at both ends of each side of the placement groove (1). A power assembly (6) is provided on the first rotating shaft (42) for synchronously driving all the long board boxes (4) to expand and contract in a petal shape. When the long board boxes (4) contract, they surround the periphery of the function board (3). An opening (43) is provided on the side wall of the long board box (4) facing the function board (3) when the long board boxes (4) contract. A liquid storage tank (44) is provided inside the long board box (4) at the edge of the opening (43). A long board electromagnet (59) is slidably provided in the liquid storage tank (44); Adaptive cooperative locking assemblies (5) are symmetrically provided at both ends of the long board box (4). The adaptive cooperative locking assembly (5) includes a plurality of support members (51). The support members (51) on the placement groove (1) and the support members (51) outside the long board box (4) are linked by a gear set. The support members (51) outside the long board box (4) and the support members (51) inside the long board box (4) are linked by a sprocket set. The support members (51) inside the long board box (4) and the long board electromagnet (59) are linked by a rack set.

2. The a pre-school education teaching demonstration device according to claim 1, characterized in that: The gear set includes a first gear (52), a second rotating shaft (531), and a second gear (53). The first gear (52) is fixedly provided on the support member (51) of the placement groove (1). The first gear (52) is coaxially arranged with the first rotating shaft (42) on the rotating member (41). The second rotating shaft (531) is rotatably engaged and provided on the support member (51) outside the long board box (4). The second gear (53) is coaxially arranged on the second rotating shaft (531). The second gear (53) performs a planetary meshing motion around the first gear (52).

3. The a pre-school education teaching demonstration device according to claim 2, characterized in that: The sprocket set includes a first sprocket (54), a second sprocket (56), and a chain (55). The first sprocket (54) is coaxially arranged on the second rotating shaft (531) and rotates synchronously with the second gear (53). The second sprocket (56) is rotatably engaged and provided on the support member (51) inside the long board box (4). The chain (55) is arranged in cooperation with the first sprocket (54) and the second sprocket (56).

4. A preschool education teaching demonstration device according to claim 3, characterized in that: The rack set includes a third gear (57) and a linkage rack (58). The third gear (57) is coaxially and fixedly connected to the second sprocket (56). The linkage rack (58) is provided on the side of the long board electromagnet (59) facing away from the opening (43). The linkage rack (58) is meshed and connected to the third gear (57). The third gear (57) is located between the linkage rack (58) and the second gear (53).

5. The a pre-school education teaching demonstration device according to claim 4, characterized in that: The power assembly (6) includes bevel gears (61). The bevel gears (61) are coaxially arranged on the first rotating shafts (42). The bevel gears (61) on two adjacent first rotating shafts (42) at a corner of the placement groove (1) are vertically meshed and connected. A protective cover (62) is provided on two adjacent shaft supports (11) to cover the bevel gears (61). A self-locking motor (63) is provided on one of the protective covers (62). The output end of the self-locking motor (63) is coaxially and fixedly connected to one of the bevel gears (61).

6. The pre-school education teaching demonstration device according to claim 5, wherein: An elastic film body (46) is provided on the opening (43) to seal the opening (43). The closed space formed by the elastic film body (46), the liquid storage tank (44), and the long plate electromagnet (59) is filled with magnetic fluid.

7. The a pre-school education teaching demonstration device according to claim 6, characterized in that: A limiting plate (12) is provided on the side wall of the placement groove (1). When the long plate box body (4) is fully unfolded, it is parallel to the wall surface and blocked by the limiting plate (12). When the long plate box body (4) is fully tightened, it is perpendicular to the wall surface and blocked by the side wall of the placement groove (1).

8. A preschool education teaching demonstration device according to claim 7, characterized in that: A power adapter (45) is provided inside the long plate box body (4). The power adapter (45) is electrically connected to the long plate electromagnet (59).

9. A preschool education teaching demonstration device according to claim 8, characterized in that: When the long plate box body (4) is fully unfolded, the elastic film body (46) is in an initial non-expanded state. When the long plate box body (4) is fully tightened, the elastic film body (46) is pushed up by the extended long plate electromagnet (59) and the magnetic fluid to bulge and then wraps around both sides of the edge of the functional plate (3).

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