阅读说明：本技术 一种学前儿童口腔健康教育教学模具 (Teaching mould for oral health education of preschool children ) 是由 李磊涛 王秀优 张扬根 张靖 张丹 石芊 于 2021-09-30 设计创作，主要内容包括：本发明提出了一种学前儿童口腔健康教育教学模具,涉及教学模具技术领域。包括相互配合的上齿排和下齿排,还包括展示架主体；上齿排和下齿排位于展示架主体内,且上齿排和下齿排的两端分别与展示架主体的两侧内壁活动连接；展示架主体内还设置有调节组件,调节组件与上齿排和下齿排活动连接,并能够带动上齿排和下齿排反向转动；通过整体结构的设置,使得能够更加简便、快捷的模拟出人体牙齿的运动模式,并且还能够分别的展示人体牙齿的分布的运动轨迹,从而使得整体装置具有更高的实用性。(The invention provides a teaching mould for preschool children oral health education, and relates to the technical field of teaching moulds. The display rack comprises an upper tooth row and a lower tooth row which are matched with each other, and also comprises a display rack main body; the upper gear row and the lower gear row are positioned in the display rack main body, and two ends of the upper gear row and the lower gear row are respectively movably connected with the inner walls of two sides of the display rack main body; the display rack main body is also internally provided with an adjusting component which is movably connected with the upper gear row and the lower gear row and can drive the upper gear row and the lower gear row to rotate reversely; through overall structure's setting for can be more simple and convenient, swift simulate out the motion pattern of human tooth, and the motion trail of the distribution of human tooth of demonstration that can also be respectively, thereby make the integrated device have higher practicality.)

1. A preschool children oral health education teaching mould is characterized by comprising an upper tooth row, a lower tooth row and a display rack main body, wherein the upper tooth row and the lower tooth row are matched with each other; the upper gear row and the lower gear row are positioned in the display rack main body, and two ends of the upper gear row and the lower gear row are respectively movably connected with the inner walls of two sides of the display rack main body; still be provided with adjusting part in the show shelf main part, adjusting part with go up the tooth row and arrange swing joint down to can drive go up tooth row and arrange the antiport down.

2. The pre-school children's oral health education teaching tool of claim 1 wherein the adjustment assembly includes two meshed gears and a row of teeth meshed with one of the gears;

the two gears are respectively connected with the upper gear row and the lower gear row and can respectively drive the upper gear row and the lower gear row to rotate; the end part of the tooth row extending out of the display rack main body is provided with a pressing rod.

3. The teaching aid of oral health education for preschool children as claimed in claim 2, wherein two gears are located in the installation cavity of the display rack main body and rotatably connected with the inner wall of the installation cavity; still be provided with the interface channel with the installation cavity intercommunication in the show shelf main part, the tooth row stretches into in the interface channel, and with the tooth row be connected press the depression bar with interface channel sliding fit.

4. The pre-school children oral health education teaching aid in claim 3, wherein both ends of the upper and lower rows of teeth are movably connected to the display rack body through connecting columns and connecting assemblies; the inner wall of show shelf main part is provided with the jack of pegging graft the complex with the spliced pole to and with the communicating slot of installation cavity, two coupling assembling all passes through slot and two the gear is pegged graft.

5. The teaching aid of claim 4 wherein the connecting assembly comprises a sleeve rod and a slide rod, the slide rod extends into the sleeve rod and is slidably engaged with the sleeve rod; and a compression spring connected with the sliding rod is also arranged in the loop bar.

6. The teaching aid of oral health education for preschool children according to claim 5, wherein the open end of the loop bar is contracted inward to form a limiting ring, and a limiting plate is arranged at one end of the sliding bar in the loop bar.

7. The teaching aid of preschool children's oral health education of claim 6, wherein a torsion spring capable of being sleeved with the connecting rod is further arranged in the jack; one end of the torsion spring is fixedly connected with the inner wall of the jack.

8. The pre-school children oral health education teaching tool according to claim 7, wherein the multi-turn metal ring of the torsion spring is a regular polygon, and the connecting column is a polygonal column capable of being sleeved with the regular polygon metal ring of the torsion spring.

9. The pre-school children oral health education teaching aid in claim 8, wherein a limiting block is provided in the mounting cavity for limiting the range of movement of the rows of teeth.

10. The pre-school children oral health education teaching tool of claim 9 wherein the edges and corners of the display rack body, the upper row of teeth and the lower row of teeth are provided with transition arcs.

Technical Field

The invention relates to the technical field of teaching molds, in particular to a teaching mold for preschool children oral health education.

Background

Oral health is an important component of human health, and is the initial part of the digestive tract, the front oral cavity is communicated with the outside, the back oral cavity is continued with the pharynx through the angina, and the teeth are an important component in the oral cavity, so that the important existence significance is achieved. The oral cavity can be cleaned by brushing teeth, oral diseases can be prevented, teeth can be thoroughly cleaned, and the dental film adhered to the teeth, false teeth or tooth corrector is completely removed, so that dental caries and periodontal diseases caused by accumulation of the dental film can be avoided. Providing oral health education to school-age children is the first step in popularizing oral health knowledge.

The teaching mould for preschool children oral health education at present has the following problems when in use:

1. the operation is not convenient enough, and the condition of the teeth in the oral cavity can not be well shown;

2. when in use, the motion condition of the teeth can not be simulated and displayed vividly, and the practicability is low.

Aiming at the problems, how to design a teaching mould for preschool children oral health education is urgently needed to solve at present.

Disclosure of Invention

The invention aims to provide a teaching mould for preschool children oral health education, which is used for solving the problems in the background technology.

The embodiment of the invention is realized by the following steps:

the embodiment of the application provides a teaching mould for oral health education of preschool children, which comprises an upper tooth row, a lower tooth row and a display rack main body, wherein the upper tooth row and the lower tooth row are matched with each other; the upper gear row and the lower gear row are positioned in the display rack main body, and two ends of the upper gear row and the lower gear row are respectively movably connected with the inner walls of two sides of the display rack main body; still be provided with adjusting part in the show shelf main part, adjusting part and last tooth row and lower tooth row swing joint to can drive tooth row and lower tooth row antiport.

In some embodiments of the invention, the adjustment assembly comprises two meshing gears and a row of teeth meshing with one of the gears;

the two gears are respectively connected with the upper gear row and the lower gear row and can respectively drive the upper gear row and the lower gear row to rotate; the end part of the tooth row extending out of the display rack main body is provided with a pressing rod.

In some embodiments of the present invention, the two gears are located in a mounting cavity of the display frame main body and are rotatably connected to an inner wall of the mounting cavity; still be provided with the interface channel with the installation cavity intercommunication in the show shelf main part, the tooth row stretches into in the interface channel, and presses the depression bar and interface channel sliding fit who is connected with the tooth row.

In some embodiments of the present invention, both ends of the upper and lower rack rows are movably connected to the display rack main body through the connecting column and the connecting assembly; the inner wall of the display stand main body is provided with a jack which is in splicing fit with the connecting column and a slot which is communicated with the mounting cavity, and the two connecting components are spliced with the two gears through the slot.

In some embodiments of the present invention, the connecting assembly includes a sleeve rod and a sliding rod, the sliding rod extends into the sleeve rod and is slidably engaged with the sleeve rod; a compression spring connected with the slide bar is also arranged in the loop bar.

In some embodiments of the present invention, the open end of the loop bar is shrunk inwards to form a limiting ring, and a limiting plate is disposed at one end of the sliding bar located in the loop bar.

In some embodiments of the present invention, a torsion spring capable of being sleeved with the connecting rod is further disposed in the insertion hole; one end of the torsion spring is fixedly connected with the inner wall of the jack.

In some embodiments of the present invention, the multi-turn metal ring of the torsion spring is a regular polygon, and the connecting column is a polygon column capable of being sleeved with the regular polygon metal ring of the torsion spring.

In some embodiments of the present invention, a limiting block is disposed in the mounting cavity for limiting a moving range of the tooth row.

In some embodiments of the present invention, the edges and corners of the display rack body, the upper row of teeth and the lower row of teeth are provided with transition arcs.

Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects: when the demonstration shelf is used, the connection structure of the human teeth is simulated through the connection of the demonstration shelf main body and the upper tooth row and the lower tooth row, so that preschool children can know the tooth structure of the human body more clearly, and the upper tooth row and the lower tooth row are movably connected with the demonstration shelf main body, so that the motion mode of the human teeth can be simulated correctly; the adjusting assembly is arranged in the display rack main body and movably connected with the upper tooth row and the lower tooth row, so that the upper tooth row and the lower tooth row can be driven to rotate upwards and downwards respectively, and the upper tooth row and the lower tooth row rotate downwards and upwards respectively, namely, the opening and closing actions are realized, the motion mode of human teeth is simulated, and the observation and understanding of preschool children are facilitated;

when in actual use promptly, through controlling the compression leg downwards, through the meshing of row of teeth and gear promptly, thereby make two gears take place to rotate, finally reach and make row of teeth and lower row of teeth pivoted purpose, and go up row of teeth and lower row of teeth when taking place to rotate, be located two torsional springs of jack, also will take place to rotate, thereby make it obtain torsion, after loosening the compression leg, according to the function and the characteristic of torsional spring, just can reach automatic recovery's purpose, just also make the integrated device when simulating, control more convenient, the practicality is higher.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic view of the connection of a display rack body to an upper rack row and a lower rack row in an embodiment of the present invention;

FIG. 2 is a schematic view of an angle of one of the upper and lower rows of teeth in an embodiment of the present invention;

FIG. 3 is a schematic view of another angle between the upper and lower rows of teeth in an embodiment of the present invention;

FIG. 4 is a schematic view of an angle of the torsion spring according to the embodiment of the present invention;

FIG. 5 is a schematic view of another angle of torsion spring according to an embodiment of the present invention;

FIG. 6 is a schematic view of the installation of a gear in an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a connecting assembly according to an embodiment of the present invention.

Icon: 1. an upper tooth row; 2. a lower tooth row; 3. a display stand body; 4. a gear; 5. a tooth row; 6. a pressing lever; 7. a mounting cavity; 8. a connecting channel; 9. a jack; 10. a loop bar; 11. a slide bar; 12. a compression spring; 13. a connecting assembly; 14. a limiting ring; 15. a limiting plate; 16. a torsion spring; 17. a limiting block; 18. connecting columns.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are usually placed in when used, the terms are only used for convenience of description and simplification of the description, and do not indicate or imply that the devices or elements indicated must have specific orientations, be constructed and operated in specific orientations, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not require that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, "a plurality" represents at least 2.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Example 1

Referring to fig. 1 to 7, fig. 1 is a schematic view illustrating a connection between a display frame main body 3 and an upper tooth row 1 and a lower tooth row 2 according to an embodiment of the present invention; FIG. 2 is a schematic view of an angle between an upper row of teeth 1 and a lower row of teeth 2 according to an embodiment of the present invention; FIG. 3 is a schematic view of another angle between the upper row of teeth 1 and the lower row of teeth 2 according to the embodiment of the present invention; FIG. 4 is a schematic view of the angle of the torsion spring 16 according to the embodiment of the present invention; FIG. 5 is a schematic view of another angle of the torsion spring 16 according to the embodiment of the present invention; fig. 6 shows a schematic view of the mounting of the gear 4 in an embodiment of the invention; fig. 7 is a schematic structural diagram of the connecting member 13 according to the embodiment of the present invention.

The embodiment of the application provides a preschool children oral health education teaching mould, it is including last dentition 1 and lower dentition 2 of mutually supporting, go up dentition 1's structure, with human oral cavity, the dentition 5's that is located the upper end structure is similar, and lower dentition 2 also be with human oral cavity in, the dentition 5's that is located the lower extreme structure is the same, and mutually support between the two, also be with human oral cavity, the cooperation of upper and lower tooth is the same, can realize rotation in opposite directions promptly, thereby simulate out the action of chewing, so that infant's understanding and science popularization.

The display rack comprises a display rack main body 3, wherein the display rack main body 3 is mainly used for installing an upper tooth row 1 and a lower tooth row 2, and can simulate the motion trail and the motion mode of human teeth after the upper tooth row 1 and the lower tooth row 2 are installed, as shown in fig. 1, in the embodiment, the display rack main body 3 is in a U-shaped structure, and the upper tooth row 1 and the lower tooth row 2 are positioned in a U-shaped groove of the display rack main body 3 and movably connected with the inner walls at two ends; that is to say, go up the tooth row 1 and the tooth row 2 is located show shelf main part 3 down, and goes up the both ends of tooth row 1 and tooth row 2 down and be connected with the both sides inner wall swing joint of show shelf main part 3 respectively.

The display rack main body 3 is also internally provided with an adjusting component which is movably connected with the upper tooth row 1 and the lower tooth row 2 and can drive the upper tooth row 1 and the lower tooth row 2 to reversely rotate, the reverse rotation of the adjusting component is that the upper tooth row 1 and the lower tooth row 2 rotate in opposite directions in the movement process, namely, the upper tooth row 1 rotates upwards from a horizontal position, the lower tooth row 2 rotates downwards from the horizontal position and then respectively returns to the horizontal position, and the upper tooth row 1 cannot rotate downwards from the horizontal position, and the lower tooth row 2 cannot rotate upwards from the horizontal position, so that the correct motion mode of simulating the teeth of a human body is achieved, the correct learning and understanding of preschool children are facilitated, and the purpose of oral health education is achieved.

When the demonstration shelf is used, the connection structure of the human teeth is simulated through the connection of the demonstration shelf main body 3 and the upper tooth row 1 and the lower tooth row 2, so that preschool children can know the tooth structure of the human body more clearly, and the upper tooth row 1 and the lower tooth row 2 are movably connected with the demonstration shelf main body 3, so that the motion mode of the human teeth can be simulated correctly; and through setting up in show shelf main part 3 and with last tooth row 1 and lower tooth row 2 swing joint's adjusting part to just can drive and go up tooth row 1 and lower tooth row 2 and upwards and downward rotation respectively earlier, at respectively downwards and upwards rotation, also realize the action of opening and shutting, thereby simulate the motion mode of human tooth, also be convenient for the observation and the understanding of preschool infant.

Of course, the lower teeth row 2 and the upper teeth row 1 are detachably connected to the display frame body 3, that is, the lower teeth row 2 and the upper teeth row 1 can be detached respectively, so that the structures of the lower teeth row 2 and the upper teeth row 1 can be individually displayed, and the lower teeth row 2 and the upper teeth row 1 should be formed in conformity with the shapes of the teeth of the human body, and should be provided with gums connected to the teeth, that is, the structures in the figure shown in fig. 1, so that the structures of the teeth of the human body and the movement patterns can be more realistically displayed.

The whole material, namely the material of the lower tooth row 2 and the upper tooth row 1, can be made of rubber, so that the rubber has better touch feeling when being taken out for display and touched, and the plasticity of the rubber is strong, so that the manufacturing process can be simplified; of course, it can also be matched to real teeth, i.e. teeth made of harder material and gums made of softer material.

The structure of the display frame main body 3 is a U-shaped structure in this embodiment, and of course, other structures are also possible, as long as both sides can mount both ends of the lower rack row 2 and the upper rack row 1, so that the lower rack row 2 and the upper rack row 1 can rotate within a certain range.

Example 2

In the present embodiment, the above-mentioned adjusting assembly comprises two meshed gears 4 and a row of teeth 5 meshed with one of the gears 4;

the structure of the adjusting assembly, namely, the adjusting assembly is composed of two meshed gears 4 and a gear row 5 meshed with one gear 4, when the adjusting assembly is controlled, namely, the two gears 4 are driven to rotate oppositely through the lifting of the gear row 5, and because the two gears 4 are respectively connected with the upper gear row 1 and the lower gear row 2, the upper gear row 1 and the lower gear row 2 can be rotated, so that the purpose of simulation is achieved.

It should be noted that, as shown in fig. 6, the gear 4 at the upper end is connected to the upper row 1, and the one gear 4 at the lower end is connected to the lower row 2, so that the upper row 1 and the lower row 2 can move in the right direction.

That is, two gears 4 are connected to the upper row 1 and the lower row 2, respectively, and as described above, the gear 4 at the upper end is connected to the upper row 1, and one gear 4 at the lower end is connected to the lower row 2; and the two gears 4 can respectively drive the upper tooth row 1 and the lower tooth row 2 to rotate.

And the tip that the tooth row 5 stretches out the show shelf main part 3 is provided with according to pressure lever 6, through the up-and-down motion according to pressure lever 6 promptly to realize tooth row 5 and drive gear 4 pivoted purpose, control simple, practical, and have higher practicality.

Example 3

In the embodiment, the two gears 4 are located in the installation cavity 7 of the display stand main body 3 and are rotatably connected with the inner wall of the installation cavity 7; still be provided with the interface channel 8 with installation cavity 7 intercommunication in the show shelf main part 3, in tooth row 5 stretched into interface channel 8, and the press bar 6 and the interface channel 8 sliding fit who is connected with tooth row 5.

That is, a mounting chamber 7 for receiving and mounting the two gears 4 is provided inside the display frame body 3, and a connecting passage 8 is provided in communication with the mounting chamber 7, the connecting passage 8 is provided to extend into the row of teeth 5, and the row of teeth 5 is engaged with the gear 4 at the upper end, as shown in fig. 6, thereby realizing a manipulation and movement mode, that is, enabling simulation of tooth movement.

Example 4

In this embodiment, both ends of the upper gear row 1 and the lower gear row 2 are movably connected to the display rack main body 3 through the connecting column 18 and the connecting component 13; the inner wall of the display frame main body 3 is provided with a jack 9 which is in splicing fit with the connecting column 18 and a slot which is communicated with the mounting cavity 7, and the two connecting components 13 are in splicing fit with the two gears 4 through the slots.

Above-mentioned scheme, that is to say, realize the connection of last tooth row 1 and lower tooth row 2 and show shelf main part 3, be connected with show shelf main part 3 through spliced pole 18 and coupling assembling 13 to, coupling assembling 13 is connected with gear 4, and two coupling assembling 13 of going up tooth row 1 and going up tooth row 1 are also connected with two gear 4 respectively.

In the middle part of gear 4, be provided with through-hole or through-hole, its effect be used for promptly with coupling assembling 13's end connection to, under gear 4's rotation, can drive coupling assembling 13 and rotate along self circumferencial direction, and then just also realized going up tooth row 1 and lower tooth row 2 pivoted purpose.

Example 5

In this embodiment, the connecting assembly 13 includes a sleeve 10 and a sliding rod 11, the sliding rod 11 extends into the sleeve 10 and is slidably engaged with the sleeve 10; a compression spring 12 connected with the sliding rod 11 is also arranged in the loop bar 10.

That is, the sleeve rod 10 and the sliding rod 11 are used for achieving the retracting function, so that the upper tooth row 1 and the lower tooth row 2 can be more conveniently mounted and dismounted, of course, other structures are also available, as long as the retracting function can be achieved, and the function of automatic reset is optimal, that is, in the embodiment, the compression spring 12 is used for pushing out the sliding rod 11, so that the automatic reset of the upper tooth row and the lower tooth row is achieved.

Example 6

In this embodiment, the open end of the loop bar 10 is shrunk inwards to form a limit ring 14, and a limit plate 15 is disposed at one end of the slide bar 11 located in the loop bar 10.

The arrangement of the structure is as shown in fig. 7, namely, the sliding rod 11 is prevented from sliding out of the loop bar 10 in the using process, the loop bar 10 is prevented from falling off, the convenience is improved, and the practicability of the whole device is improved.

In practical use, the thickness of the limiting plate 15 should be set according to the situation, and the purpose is to avoid the deflection of the sliding rod 11, and the edge of the limiting plate 15 should be in sliding fit with the inner wall of the loop bar 10, i.e. mutually contradicted, so that the sliding friction between the two is smaller, a smooth layer can be set between the two or some lubricating oil can be filled in the two.

Example 7

In this embodiment, a torsion spring 16 capable of being sleeved with the connecting rod is further disposed in the insertion hole 9; one end of the torsion spring 16 is fixedly connected with the inner wall of the jack 9.

By the arrangement of the torsion spring 16, when in use, the upper tooth row 1 and the lower tooth row 2 can be automatically reset after rotating downwards and downwards respectively from the horizontal position, namely the position shown in fig. 1, namely the upper tooth row 1 can automatically rotate downwards under the action of the torsion spring 16, and the lower tooth row 2 automatically rotates upwards, so that the structure and the position shown in fig. 1 are restored.

When in actual use promptly, through controlling the compression leg downwards, through the meshing of row of teeth 5 and gear 4 promptly, thereby make two gears 4 take place to rotate, finally reach and make and go up row of teeth 1 and 2 pivoted purposes down, and go up row of teeth 1 and 2 when taking place to rotate down, be located two torsional springs 16 of jack 9, also will take place to rotate, thereby make it obtain torsion, after loosening the compression leg, according to torsional spring 16's function and characteristic, just can reach the purpose of automatic recovery, just also make the integrated device when simulating, it is more convenient to control, and the practicality is higher.

Example 8

In the present embodiment, the multi-turn metal ring of the torsion spring 16 is a regular polygon, and the connecting post 18 is a polygon post capable of being sleeved with the regular polygon metal ring of the torsion spring 16.

The torsion spring 16 is formed by coiling a plurality of circles of metal, in general, the structure of the torsion spring 16 is cylindrical, and in this embodiment, the structure of a part of the metal ring, namely the side surface of the metal ring, is polygonal, and the cross section of a part of the connecting column 18 is a polygonal column capable of being spliced with the polygonal metal ring, so that the splicing of the torsion spring 16 and the connecting column 18 is realized, and the connecting column 18 can drive the torsion spring 16 to rotate when rotating.

In the embodiment, the torsion spring 16 is close to the part of the port of the jack 9, the metal ring of the part is polygonal, and the part of the connecting column 18 close to the upper tooth row 1 or the lower tooth row 2 is polygonal column, so that the two parts are in plug-in fit.

Example 9

In this embodiment, a stopper 17 for limiting the moving range of the tooth row 5 is provided in the mounting chamber 7. Namely, by the stopper 17, as shown in fig. 6, there is a position limitation due to the downward movement of the pressing rod 6, that is, the teeth on the teeth row 5 are prevented from meshing with the gear 4 at the lower end.

In this embodiment, the edges and corners of the display rack body 3, the upper row of teeth 1 and the lower row of teeth 2 are all provided with transition arcs. The arrangement of the structure avoids cutting the fingers and other parts of the personnel during operation and control, and improves the safety.

The working principle of the teaching mold for the oral health education of preschool children is as follows: when the demonstration shelf is used, the connection structure of the human teeth is simulated through the connection of the demonstration shelf main body 3 and the upper tooth row 1 and the lower tooth row 2, so that preschool children can know the tooth structure of the human body more clearly, and the upper tooth row 1 and the lower tooth row 2 are movably connected with the demonstration shelf main body 3, so that the motion mode of the human teeth can be simulated correctly; and through the setting in show shelf main part 3 and with last tooth row 1 and lower tooth row 2 swing joint's adjusting part to just can drive last tooth row 1 and lower tooth row 2 and upwards and downward rotation respectively earlier, at respectively downwards and upwards rotation, just so realize the action of opening and shutting, thereby simulate the motion mode of human tooth.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.