Multifunctional middle school mathematics teaching device

Abstract

This utility model discloses a multifunctional junior high school mathematics teaching device, relating to the field of teaching device technology. It includes: a first long plate with a storage groove on one side along its width and a first sliding groove on the other side, the length directions of both the storage groove and the first sliding groove being parallel to the length direction of the first long plate; a second long plate, one end hinged to one end of the storage groove, with a second sliding groove on its surface along its length; a third long plate, one end slidably disposed within the second sliding groove, with a third sliding groove on its length; and a fourth long plate, one end slidably disposed within the first sliding groove, and the other end equipped with a switching mechanism, which is slidably disposed within the third sliding groove, possessing both a guiding state and an adjusting state. This utility model, through the switching mechanism located at the connection between the third and fourth long plates, allows the third and fourth long plates to flexibly switch between locked rotation and relative rotation states, thereby achieving flexible transformation between triangles and quadrilaterals.

Description

Technical Field

[0001] This utility model relates to the field of teaching device technology, specifically a multifunctional junior high school mathematics teaching device. Background Technology

[0002] In junior high school mathematics geometry teaching, triangles and quadrilaterals are two fundamental and important teaching contents. In order to help students intuitively understand their properties and theorems (such as the stability, congruence criteria, and Pythagorean theorem of triangles, and the sum of the interior angles and instability of quadrilaterals), teachers usually need to use teaching demonstration devices.

[0003] Currently, common teaching aids on the market suffer from the following shortcomings: 1. Limited Functionality: Traditional demonstration aids are mostly independent triangles, rulers, or quadrilateral frames. Teachers need to frequently change aids when explaining different shapes, disrupting the continuity of the lesson and reducing teaching efficiency; 2. Cumbersome Switching: Some aids that attempt to combine multiple functions usually adopt a detachable, modular structure. For example, several long plates are connected into a triangle or quadrilateral by pins or bolts. When switching between different shapes, manual disassembly and reassembly of components are required, which is cumbersome, time-consuming, and prone to loss or damage of small parts; 3. Loose Structure and Inaccurate Demonstration: While simple hinged or linkage structures can achieve shape changes, they often lack effective locking or guiding mechanisms. For example, when demonstrating the change of triangle side length while maintaining its shape, a simple hinged structure cannot provide stable linear guidance, resulting in wobbling and inaccuracy of the shape, affecting the teaching effect. Therefore, there is an urgent need in this field for an integrated teaching device that can highly integrate the demonstration functions of triangles and quadrilaterals and can quickly, stably and seamlessly switch between the two forms, in order to solve the problems of single function, cumbersome operation and inaccurate demonstration in the existing technology. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a multifunctional junior high school mathematics teaching device.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A multifunctional junior high school mathematics teaching device, comprising:

[0007] The first long plate has a storage groove on one side along its width and a first sliding groove on the other side, and the length directions of the storage groove and the first sliding groove are parallel to the length direction of the first long plate.

[0008] The second long plate has one end hinged to one end of the storage slot, and a second groove is opened on the surface of the second long plate along the length direction.

[0009] The third long plate has one end slidably disposed in the second groove, and the third long plate has a third groove along its length.

[0010] The fourth long plate has one end slidably disposed in the first slide groove, and the other end is provided with a switching mechanism, which is slidably disposed in the third slide groove and has a guiding state and an adjustment state.

[0011] In the guiding state, the third and fourth long plates can overlap and slide along their respective lengths, causing the device to form a triangle; while in the adjusting state, the third and fourth long plates can switch to a mechanism that allows them to rotate relative to each other along their axes, causing the device to form a quadrilateral.

[0012] Preferably, the switching mechanism consists of an adjusting rod and a limiting block. The adjusting rod slides through one end of the fourth long plate near the third long plate, and a limiting block is provided at one end of the adjusting rod that passes through the third slide groove. When the side wall of the limiting block is in contact with the side wall of the third slide groove, it can only move horizontally. At the same time, when the limiting block is disengaged from the third slide groove, it is in an adjusting state. When the limiting block is embedded in the third slide groove and restricts the rotation of the third and fourth long plates, it is in a guiding state.

[0013] Preferably, the axial cross-section of the protrusion of the third long plate sliding in the second groove and the protrusion of the fourth long plate sliding in the first groove are both convex-shaped, and the larger ends of the two protrusions slide in the interior of the first groove and the second groove, respectively.

[0014] Preferably, it also includes a limiting plate, which is symmetrically disposed on the sidewalls of the first slide groove, the second slide groove and the third slide groove near the opening, and the sidewall of the limiting plate elastically abuts against the smaller end of the protrusions of the third long plate and the fourth long plate for sliding and rotating.

[0015] Preferably, the sidewall of the limiting plate is uniformly provided with multiple arc-shaped grooves along the length direction to form a wave shape, and the arc surface of the arc-shaped groove fits the arc surface of the smaller end of the corresponding protrusion. At the same time, the circumference of the adjusting rod can fit the sidewall of the corresponding arc-shaped groove and rotate.

[0016] Preferably, the sidewalls of both the first and second long plates are provided with scale lines, and a protractor is provided on the first long plate near the hinge of the second long plate.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. Functional Integration and One-Click Switching: Through a specially designed switching mechanism, this device integrates the demonstration functions of triangles and quadrilaterals. Users only need to operate the switching mechanism to switch between the guiding state (forming a stable triangle) and the adjustment state (forming a variable quadrilateral) with a single click. No parts need to be disassembled or assembled, making the operation extremely fast and greatly improving the efficiency and continuity of classroom teaching.

[0019] 2. Stable and accurate triangle demonstration: When in the guiding state, the switching mechanism locks the connection between the third and fourth long plates, allowing them to slide only along their respective lengths. Thus, when demonstrating a triangle, the device forms a rigid and stable frame, accurately demonstrating the stability, congruence criteria, and Pythagorean theorem properties of triangles, effectively overcoming the swaying problem of traditional hinge models.

[0020] 3. The quadrilateral demonstration is intuitive and vivid: When in the adjustment state, the switching mechanism allows the third and fourth long plates to rotate relative to each other with the third and fourth long plates as the axis. Then, the teacher can smoothly demonstrate the instability of quadrilaterals, the changes in interior angles, and the deformation process of various special quadrilaterals (such as parallelograms and trapezoids). The teaching demonstration is very intuitive and vivid.

[0021] 4. Compact structure and high reliability: All components of the entire device are integrated into one unit, with no small parts that are easily lost. The compact structure and long service life make it very suitable for frequent classroom demonstrations. Attached Figure Description

[0022] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0023] Figure 1 This is a schematic diagram of the storage state of this utility model;

[0024] Figure 2 This is a schematic diagram of the triangular unfolded state of this utility model;

[0025] Figure 3 This is a front view schematic diagram of the quadrilateral unfolded state of this utility model;

[0026] Figure 4 This is a rear view schematic diagram of the quadrilateral unfolded state of this utility model;

[0027] Figure 5 This is a schematic diagram of the connection structure between the two ends of the fourth long plate of this utility model.

[0028] The diagram shows the following labels: 1. First long plate; 11. First slide groove; 12. Storage groove; 2. Second long plate; 21. Second slide groove; 3. Third long plate; 31. Third slide groove; 4. Fourth long plate; 5. Switching mechanism; 51. Adjusting rod; 52. Limiting block; 6. Limiting plate. Detailed Implementation

[0029] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0030] Example

[0031] like Figures 1 to 5 As shown, a multifunctional junior high school mathematics teaching device includes:

[0032] The first long plate 1 has a storage groove 12 on one side along the width direction and a first sliding groove 11 on the other side, and the length directions of the storage groove 12 and the first sliding groove 11 are parallel to the length direction of the first long plate 1.

[0033] The second long plate 2 is hinged at one end to one end of the storage groove 12, and a second sliding groove 21 is formed on the surface of the second long plate 2 along the length direction.

[0034] The third long plate 3 has one end slidably disposed in the second slide groove 21, and the third long plate 3 has the third slide groove 31 opened along the length direction;

[0035] The fourth long plate 4 is slidably disposed in the first slide groove 11 at one end and a switching mechanism 5 is provided at the other end. The switching mechanism 5 is slidably disposed in the third slide groove 31 and has a guiding state and an adjustment state.

[0036] In the guiding state, the third long plate 3 and the fourth long plate 4 can overlap and slide along their respective lengths, causing the device to form a triangle; while in the adjusting state, the third long plate 3 and the fourth long plate 4 can switch the mechanism 5 to rotate relative to each other along their axes, causing the device to form a quadrilateral.

[0037] Specifically, when a user carries this teaching device to teach junior high school students about triangles and quadrilaterals, the first long plate 1 and the second long plate 2 can be unfolded around the hinge point. During the unfolding process, the protrusion of the fourth long plate 4 is slidably positioned within the first groove 11 and can rotate, allowing the relative position and angle between the fourth long plate 4 and the first long plate 1 to be flexibly adjusted. Similarly, the protrusion of the third long plate 3 is slidably positioned within the second groove 21 and can rotate, allowing the relative position and angle between the third long plate 3 and the second long plate 2 to be flexibly adjusted. Thus, after the first long plate 1 and the second long plate 2 are unfolded, they automatically form a triangle together with the third long plate 3 and the fourth long plate 4. At this point, by sliding the fourth long plate 4 and the third long plate 3, the length of their overlapping portion can be changed. Adjusting the length of one side of the triangle will cause it to change synchronously with the angle between the first long plate 1 and the second long plate 2. When demonstrating to junior high school students how a triangle can be transformed into a quadrilateral, the initial guiding state of the switching mechanism 5 is switched to the adjustment state, allowing the third long plate 3 and the fourth long plate 4 to slide relative to each other and rotate relative to each other. Then, the user moves the position of the switching mechanism 5 and adjusts the angle between the third long plate 3 and the fourth long plate 4, thus allowing the device to flexibly switch from a triangle to a quadrilateral. The relative positions and relative angles between the first long plate 1, the second long plate 2, the third long plate 3, and the fourth long plate 4 can all be flexibly adjusted, enabling the device to form quadrilaterals of different shapes, enhancing the intuitiveness of graphic transformations, and making it easier for junior high school students to understand.

[0038] Among them, the junior high school mathematics teaching device can flexibly display the content of the junior high school mathematics textbook knowledge points software system during the dynamic demonstration of triangle transformation, quadrilateral transformation and mutual transformation between triangle and quadrilateral. In this way, junior high school students can not only understand the specific knowledge points from the display screen, but also transform the knowledge points from two-dimensional plane to three-dimensional through the dynamic demonstration of the teaching device, thus deepening their understanding and impression of the knowledge points from multiple perspectives.

[0039] The switching mechanism 5 consists of an adjusting rod 51 and a limiting block 52. The adjusting rod 51 is slidably inserted through one end of the fourth long plate 4 near the third long plate 3, and the limiting block 52 is provided at one end of the adjusting rod 51 that passes through the third slide groove 31. When the side wall of the limiting block 52 is in contact with the side wall of the third slide groove 31, it can only move horizontally. At the same time, when the limiting block 52 is disengaged from the third slide groove 31, it is in an adjusting state. When the limiting block 52 is embedded in the third slide groove 31 and restricts the rotation of the third long plate 3 and the fourth long plate 4, it is in a guiding state.

[0040] Specifically, the switching mechanism 5 achieves mechanical locking and switching between two working states through the "fitting" and "disengaging" of the limiting block 52 and the third slide 31. The thickness of the limiting block 52 is less than the depth of the third slide 31. In the guiding state, the limiting block 52 is embedded in the third slide 31, with its sidewall tightly fitting against the slide sidewall. This geometric constraint completely restricts the relative rotation between the third long plate 3 and the fourth long plate 4, forcing them to slide only overlapping along their lengths. This ensures that when forming a triangle, this side can act as a stable link, maintaining the rigidity of the triangle. In the adjustment state, by pulling the adjustment rod 51, the limiting block 52 is disengaged from the third slide 31, releasing the rotation constraint. At this time, the third long plate 3 and the fourth long plate 4 can freely rotate relative to each other via the switching mechanism 5, providing the necessary degrees of freedom for transforming quadrilaterals. This design features clear state switching and intuitive operation, making it very suitable for classroom teaching scenarios.

[0041] The axial cross-section of the protrusion of the third long plate 3 sliding in the second slide groove 21 and the protrusion of the fourth long plate 4 sliding in the first slide groove 11 are both convex-shaped, and the larger ends of the two protrusions slide in the interior of the first slide groove 11 and the second slide groove 21 respectively.

[0042] Specifically, the protruding part design of the convex-shaped axial section is an efficient anti-detachment structure. The larger head is constrained inside the slide groove, while the smaller neck extends from the slide groove opening and connects to the long plate body. This structure ensures that the protruding parts of the third long plate 3 and the fourth long plate 4 will never detach from the corresponding slide groove when sliding and rotating, greatly enhancing the reliability and durability of the device in repeated operation and dynamic demonstration. At the same time, it ensures that there is sufficient contact area between the long plate and the slide groove, making the sliding smooth and the rotation flexible, providing students with a smooth and clear demonstration process.

[0043] It also includes a limiting plate 6, which is symmetrically arranged on the sidewalls of the first slide groove 11, the second slide groove 21 and the third slide groove 31 near the opening, and the sidewalls of the limiting plate 6 elastically abut against the smaller end of the protrusions of the third long plate 3 and the fourth long plate 4 for sliding and rotating.

[0044] Specifically, the core purpose of adding the limiting plate 6 is to axially limit the "smaller end" (i.e., the neck) of the protrusion. It clamps the neck of the protrusion from both sides of the slide opening, effectively preventing the long plate from lateral movement or shaking perpendicular to the plate surface when sliding or rotating. This design significantly improves the stability and accuracy of the connection between the long plates, so that the triangle or quadrilateral shape formed can maintain a stable shape during demonstration and measurement, avoiding graphic distortion caused by loose parts, and ensuring the accuracy and rigor of teaching demonstrations.

[0045] The sidewall of the limiting plate 6 is uniformly provided with multiple arc-shaped grooves along its length to form a wave shape, and the arc surface of the arc-shaped groove fits the arc surface of the smaller end of the corresponding protrusion. At the same time, the circumference of the adjusting rod 51 can fit the sidewall of the corresponding arc-shaped groove and rotate.

[0046] Specifically, the design of the wavy arc-shaped groove adds a discrete positioning function to the device. When the arc-shaped neck of the protruding part is inserted into different arc-shaped grooves, it provides a clear sense of segmentation and tactile feedback, and generates a certain positioning resistance. This provides teachers with a discrete positioning function, which can quickly set the side length or angle and keep it in a commonly used position, making it convenient for explanation and measurement without the need for continuous manual fixation. At the same time, the circumference of the adjusting rod 51 can also fit against the side wall of the groove. This means that in the quadrilateral state, the included angle between two adjacent sides (the third long plate 3 and the fourth long plate 4) can also be discretely positioned and maintained through this structure, further enhancing the convenience and stability of the device when displaying various quadrilateral shapes.

[0047] The sidewalls of the first long plate 1 and the second long plate 2 are provided with scale lines, and a protractor is provided on the first long plate 1 near the hinge of the second long plate 2.

[0048] Specifically, the addition of scale lines and a protractor upgrades this device from a simple graphic demonstration tool into a comprehensive, multifunctional mathematical teaching aid that integrates demonstration and measurement. Students can directly read the side lengths on the scale lines of the long boards and read the angle between the first long board 1 and the second long board 2 (i.e., the vertex angle of the triangle) on the protractor. This allows students to dynamically adjust the shape of the figure while observing and understanding in real time and intuitively the impact of changes in side length and angle on the properties of the figure (such as the stability of triangles and the determination of quadrilateral types). This combines abstract geometric theorems with concrete numerical measurements, greatly promoting inquiry-based learning and a deeper understanding of geometric knowledge.

[0049] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A multifunctional junior high school mathematics teaching device, characterized in that, include: The first long plate has a storage groove on one side along its width and a first sliding groove on the other side, and the length directions of the storage groove and the first sliding groove are parallel to the length direction of the first long plate. The second long plate has one end hinged to one end of the storage slot, and a second groove is opened on the surface of the second long plate along the length direction. The third long plate has one end slidably disposed in the second groove, and the third long plate has a third groove along its length. The fourth long plate has one end slidably disposed in the first slide groove, and the other end is provided with a switching mechanism, which is slidably disposed in the third slide groove and has a guiding state and an adjustment state. In the guiding state, the third and fourth long plates can overlap and slide along their respective lengths, causing the device to form a triangle; while in the adjusting state, the third and fourth long plates can switch to a mechanism that allows them to rotate relative to each other along their axes, causing the device to form a quadrilateral.

2. The multifunctional junior high school mathematics teaching device according to claim 1, characterized in that: The switching mechanism consists of an adjusting rod and a limiting block. The adjusting rod slides through the end of the fourth long plate near the third long plate, and the end of the adjusting rod that passes through the third slide groove is provided with a limiting block. When the side wall of the limiting block is in contact with the side wall of the third slide groove, it can only move horizontally. At the same time, when the limiting block is disengaged from the third slide groove, it is in an adjusting state. When the limiting block is embedded in the third slide groove and restricts the rotation of the third and fourth long plates, it is in a guiding state.

3. The multifunctional junior high school mathematics teaching device according to claim 1, characterized in that: The axial cross-sections of the protrusions of the third long plate sliding in the second groove and the protrusions of the fourth long plate sliding in the first groove are both convex-shaped, and the larger ends of the two protrusions slide inside the first and second grooves respectively.

4. The multifunctional junior high school mathematics teaching device according to claim 3, characterized in that: It also includes limiting plates, which are symmetrically arranged on the sidewalls of the first slide groove, the second slide groove and the third slide groove near the opening, and the sidewalls of the limiting plates elastically abut against the smaller end of the protrusions of the third long plate and the fourth long plate for sliding and rotating.

5. A multifunctional junior high school mathematics teaching device according to claim 4, characterized in that: The sidewall of the limiting plate is uniformly provided with multiple arc-shaped grooves along its length to form a wave shape, and the arc surface of the arc-shaped groove fits the arc surface of the smaller end of the corresponding protrusion. At the same time, the circumference of the adjusting rod can fit the sidewall of the corresponding arc-shaped groove and rotate.

6. The multifunctional junior high school mathematics teaching device according to claim 1, characterized in that: Both the first and second long plates have scale lines on their sidewalls, and a protractor is provided on the first long plate near the hinge of the second long plate.

Images