A teaching demonstration device

Abstract

The application discloses a teaching demonstration device, which comprises a base and a driving system. The driving system comprises a power source and a multi-stage transmission mechanism. The multi-stage transmission mechanism comprises a main transmission unit directly connected with the power source, a linkage mechanism connected with the main transmission unit, at least one auxiliary transmission unit connected with the main transmission unit through the linkage mechanism, and a motion output unit linked with the main transmission unit through the linkage mechanism. The auxiliary transmission units are connected through meshing transmission or belt transmission to form a power transmission chain. The linkage mechanism is configured to simultaneously distribute the power of the main transmission unit to the auxiliary transmission units to drive the power transmission chain to operate, and to the motion output unit to convert part of the power into vertical plane compound motion. The demonstration device can simultaneously demonstrate plane multi-stage transmission and vertical plane compound motion, intermittent motion and other motion forms on the same experimental platform, and intuitively demonstrate the power distribution and conversion process, which helps students to better understand the mechanical transmission principle.

Description

Technical Field

[0001] This utility model particularly relates to a teaching demonstration device. Background Technology

[0002] Existing teaching demonstration devices, such as planetary gear models and mechanical transmission demonstrators, are mostly simple gear or belt drive structures with limited motion, only capable of rotation or linear motion within a plane. This monotonous display makes it difficult to intuitively present the spatial motion relationships of complex mechanical transmissions, and it cannot realize multi-dimensional composite motion, thus limiting the teaching demonstration of spatial mechanism principles. Moreover, they are mostly single transmission chains, unable to demonstrate the parallel operation of multiple transmission chains and power distribution, which does not match the collaborative work of multiple transmission chains in actual mechanical systems, affecting students' comprehensive understanding of complex transmission systems. Furthermore, their simple motion modes and power transmission processes are not conducive to demonstrating how power is distributed to different transmission chains and drives different motion outputs, hindering students from building a complete concept of mechanical transmission systems. With the development of mechanical technology, the requirements for the depth and breadth of mechanical transmission teaching are increasing. Traditional devices are insufficient to meet modern teaching needs, necessitating more complex and multifunctional teaching demonstration devices to improve teaching effectiveness and adapt to the diversified needs of teaching objectives. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a teaching demonstration device.

[0004] To solve the aforementioned technical problems, this utility model adopts the following technical solution: A teaching demonstration device includes a base and a drive system. The drive system includes a power source and a multi-stage transmission mechanism driven by the power source. The multi-stage transmission mechanism includes a main transmission unit directly connected to the power source, a linkage mechanism connected to the main transmission unit, at least one auxiliary transmission unit connected to the main transmission unit through the linkage mechanism, and a motion output unit linked to the main transmission unit through the linkage mechanism. The auxiliary transmission units form a power transmission chain through meshing or belt drive. The linkage mechanism is configured to simultaneously distribute the power of the main transmission unit to the auxiliary transmission units to drive the power transmission chain, and to distribute part of the power to the motion output unit to convert it into a vertical planar composite motion.

[0005] Preferably, the linkage mechanism includes a first transmission wheel and a second transmission wheel arranged in parallel on the main transmission unit, an input transmission wheel on the auxiliary transmission unit, and a drive transmission wheel on the motion output unit; wherein the first transmission wheel is connected to the input transmission wheel via a first belt; and the second transmission wheel is connected to the drive transmission wheel via a second belt.

[0006] Preferably, the motion output unit includes an upper transmission rod, a linkage gear disk, a rotating gear disk, and a fixed platform. One end of the upper transmission rod is fixedly connected to a drive transmission wheel, and the other end is rotatably mounted on the base. The linkage gear disk is fixedly mounted on the upper transmission rod. The rotating gear disk is hinged to the upper transmission rod via a connecting rod in a manner offset from the center of the linkage gear disk. The fixed platform is provided with an annular mounting groove with continuous teeth, and the rotating gear disk maintains meshing with the teeth. The rotation of the upper transmission rod is synchronized with the rotation of the linkage gear disk. The connecting rod drives the rotating gear disk to perform circumferential meshing and rolling along the teeth, while simultaneously driving the linkage gear disk to perform synchronous rotary motion in the vertical plane.

[0007] Preferably, the at least one auxiliary transmission unit includes: a first auxiliary transmission rod connected to the main transmission unit via the linkage mechanism; a second auxiliary transmission rod linked to the first auxiliary transmission rod via meshing or belt drive; a third auxiliary transmission rod linked to the second auxiliary transmission rod via meshing; and a fourth auxiliary transmission rod rotatably mounted on the base and having a sixth toothed disc, the sixth toothed disc being linked to the first toothed disc via a chain. The auxiliary transmission units form a multi-stage power transmission chain and satisfy at least one of the following conditions: the first auxiliary transmission rod has a first toothed disc and a second toothed disc, respectively used to drive different transmission paths; the second auxiliary transmission rod has a third toothed disc and a fourth toothed disc, wherein the fourth toothed disc meshes with the second toothed disc of the first auxiliary transmission rod; and the third auxiliary transmission rod has a fifth toothed disc, wherein the fifth toothed disc meshes with the third toothed disc of the second auxiliary transmission rod.

[0008] Preferably, the mechanism further includes an intermittent motion mechanism, which comprises a turntable assembly and a toggle block. An upper drive wheel is fixedly mounted on the upper drive rod, and a left drive rod is rotatably mounted on the base. A left drive wheel is mounted on the left drive rod, and the left drive wheel is connected to the upper drive wheel via a third belt. The turntable assembly includes a turntable and a lever. The turntable is fixed to the left drive rod and has a radially extending notch. The inner end of the lever is fixed to the center of the turntable, and its outer end extends to the outside of the notch. The toggle block is rotatably mounted on the base and has four equidistant arc-shaped guide grooves around its periphery. The outer end of the lever can be slidably embedded in any of the guide grooves. When the upper drive rod rotates, the turntable is driven to rotate via the third belt, causing the lever to periodically push the toggle block to rotate intermittently.

[0009] Preferably, it also includes a lower drive wheel rotatably mounted on the base, the lower drive wheel being connected to the left drive rod via a fourth belt; a motion frame, one end of which is rotatably mounted to the base, and the other end of which is connected to the lower drive wheel.

[0010] Preferably, it further includes a right transmission rod, rotatably disposed on the side of the main transmission unit opposite to the auxiliary transmission unit; a right transmission wheel, fixed to the right transmission rod; a third transmission wheel, fixed to the main transmission unit and connected to the right transmission wheel via a fifth belt; a left conical gear plate, coaxially fixed to the right transmission rod; and a right conical gear plate, rotatably disposed on the base and meshing with the left conical gear plate.

[0011] The beneficial effects of this utility model are: This application discloses a teaching demonstration device that allows teachers to simultaneously demonstrate various motion forms, such as planar multi-stage transmission, vertical planar composite motion, and intermittent motion, on the same experimental platform. It also visually demonstrates the distribution and conversion process of power, helping students to understand the principles of mechanical transmission and the motion laws of complex mechanical systems more deeply, thereby improving teaching effectiveness. Attached Figure Description

[0012] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a teaching demonstration device according to this application. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a teaching demonstration device according to this application. Figure 2 . Detailed Implementation

[0013] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0014] The orientation shown in the accompanying drawings should not be construed as limiting the specific protection scope of this utility model, but is only for reference and understanding of preferred embodiments. The product components shown in the drawings can be changed in position, increased in number, or simplified in structure.

[0015] The “connection” described in the specification and the “connection” relationship between the components shown in the accompanying drawings can be understood as a fixed connection, a detachable connection, or a connection that forms an integral unit; it can be a direct connection or a connection through an intermediate medium. Those skilled in the art can understand the connection relationship according to the specific circumstances and can derive different implementation methods such as screwing, riveting, soldering, snap-fitting, or embedding to suitably replace it.

[0016] The directional terms such as up, down, left, right, top, and bottom mentioned in the instruction manual and the directions shown in the attached drawings indicate that the components can directly contact each other or contact each other through other features; for example, "up" can mean directly above or diagonally above, or it simply means above other objects; other directions can be understood by analogy.

[0017] The materials used to manufacture solid-shaped parts as shown in the specification and drawings may be metallic, non-metallic, or other synthetic materials. The machining processes used for solid-shaped parts may include stamping, forging, casting, wire cutting, laser cutting, injection molding, CNC milling, 3D printing, machining, etc. Those skilled in the art may adapt or combine the above materials and manufacturing processes according to different processing conditions, costs, and precision requirements.

[0018] like Figure 1-2 As shown, a teaching demonstration device includes a base 1 and a drive system. The drive system includes a power source 3 and a multi-stage transmission mechanism driven by the power source. As an embodiment 1, the power source can be a rotary motor.

[0019] The multi-stage transmission mechanism includes a main transmission unit 2 directly connected to the power source, a linkage mechanism connected to the main transmission unit 2, at least one auxiliary transmission unit connected to the main transmission unit 2 through the linkage mechanism, and a motion output unit linked to the main transmission unit 2 through the linkage mechanism. The auxiliary transmission units form a power transmission chain through meshing or belt drive. The linkage mechanism is configured to simultaneously distribute the power of the main transmission unit 2 to the auxiliary transmission units to drive the power transmission chain, and to distribute the power to the motion output unit to convert part of the power into a vertical planar composite motion.

[0020] Specifically, the linkage mechanism includes a first transmission wheel 28 and a second transmission wheel 29 arranged in parallel on the main transmission unit 2, an input transmission wheel 31 on the auxiliary transmission unit 4, and a drive transmission wheel 33 on the motion output unit; wherein the first transmission wheel 28 is connected to the input transmission wheel 31 via a first belt 30; and the second transmission wheel 29 is connected to the drive transmission wheel 33 via a second belt 32.

[0021] The motion output unit includes an upper transmission rod 18, a linkage gear 34, a rotating gear 24, and a fixed platform 20. One end of the upper transmission rod 18 is fixedly connected to the drive transmission wheel 33, and the other end is rotatably mounted on the base 1. The linkage gear 34 is fixedly mounted on the upper transmission rod 18. The rotating gear 24 is hinged to the upper transmission rod 18 via a connecting rod 23 in a manner offset from the center of the linkage gear 34. The fixed platform 20 is provided with an annular mounting groove 21 with continuous teeth 22, and the rotating gear 24 is engaged with the teeth 22. The rotating gear 34 of the upper transmission rod 18 rotates synchronously with the linkage gear 34. The connecting rod 23 drives the rotating gear 24 to rotate in a circumferential direction along the teeth 22, and at the same time drives the linkage gear 34 to rotate synchronously in the vertical plane.

[0022] The at least one auxiliary transmission unit includes: a first auxiliary transmission rod 4, connected to the main transmission unit 2 via the linkage mechanism; a second auxiliary transmission rod 11, linked to the first auxiliary transmission rod 4 via meshing or belt drive; a third auxiliary transmission rod 14, linked to the second auxiliary transmission rod 11 via meshing; and a fourth auxiliary transmission rod 141, rotatably mounted on the base 1, with a sixth toothed disc 142 on it, the sixth toothed disc 142 being linked to the first toothed disc 7 via a chain. Each auxiliary transmission unit forms a multi-stage power transmission chain and satisfies at least one of the following conditions: the first auxiliary transmission rod 4 has a first toothed disc 7 and a second toothed disc 8, respectively used to drive different transmission paths; the second auxiliary transmission rod 11 has a third toothed disc 12 and a fourth toothed disc 13, wherein the fourth toothed disc 13 meshes with the second toothed disc 8 of the first auxiliary transmission rod 4; and the third auxiliary transmission rod 14 has a fifth toothed disc 16, wherein the fifth toothed disc 16 meshes with the third toothed disc 12 of the second auxiliary transmission rod 11.

[0023] In addition, an intermittent motion mechanism is included, comprising a turntable assembly and a toggle block 42. An upper drive wheel 39 is fixedly mounted on the upper drive rod 18, and a left drive rod 36 is rotatably mounted on the base 1. A left drive wheel 37 is mounted on the left drive rod 36 and connected to the upper drive wheel 39 via a third belt 38. The turntable assembly includes a turntable 40 and a toggle lever 41. The turntable 40 is fixed to the left drive rod 36 and has a radially extending notch 44. The inner end of the toggle lever 41 is fixed to the center of the turntable 40, and its outer end extends to the outside of the notch 44. The toggle block 42 is rotatably mounted on the base 1 and has four equidistant arc-shaped guide grooves 43 around its periphery. The outer end of the toggle lever 41 is slidably embedded in any of the guide grooves 43. When the upper drive rod 18 rotates, it drives the turntable 40 to rotate via the third belt 38, causing the toggle lever 41 to periodically push the toggle block 42. It rotates intermittently.

[0024] It also includes a lower transmission wheel 46 rotatably mounted on the base 1, the lower transmission wheel 46 being connected to the left transmission rod 36 via a fourth belt 47; and a motion frame 48, one end of which is rotatably mounted on the base 1, and the other end of which is connected to the lower transmission wheel 46.

[0025] It also includes a right transmission rod 52, which is rotatably mounted on the side of the main transmission unit 2 opposite to the auxiliary transmission unit; a right transmission wheel 53, which is fixed to the right transmission rod 52; a third transmission wheel 54, which is fixed to the main transmission unit 2 and connected to the right transmission wheel 53 via a fifth belt 55; a left conical gear plate 56, which is coaxially fixed to the right transmission rod 52; and a right conical gear plate 57, which is rotatably mounted on the base 1 and meshes with the left conical gear plate 56.

[0026] In the actual teaching demonstration, when power source 3 is started, main transmission unit 2 begins to rotate. The power of the main transmission unit is distributed to two different transmission chains through the linkage mechanism. On one hand, the power is transmitted to auxiliary transmission unit 4 through the first transmission wheel 28 and the first belt 30, driving each auxiliary transmission rod in the auxiliary transmission unit to perform multi-stage planar transmission according to the set meshing relationship. Students can clearly observe the rotation of the gear plates on each auxiliary transmission rod and the change of transmission speed, and understand the principle of planar multi-stage transmission and the power transmission path.

[0027] On the other hand, power is transmitted to the drive transmission wheel 33 of the motion output unit through the second transmission wheel 29 and the second belt 32, driving the upper transmission rod 18 to rotate. The rotation of the upper transmission rod 18 causes the linkage gear 34 to rotate synchronously, and at the same time, through the connecting rod 23, it drives the rotating gear 24 to perform circumferential rolling on the teeth 22 of the fixed platform 20, thereby realizing the rotation of the rotating gear 24 in the horizontal plane and the rotational motion of the linkage gear 34 in the vertical plane, intuitively demonstrating the conversion process of multi-dimensional motion in space, and helping students understand the complexity of spatial motion and the linkage relationship.

[0028] Simultaneously, the rotation of the upper transmission rod 18 also drives the left transmission rod 36 to rotate via the upper transmission wheel 39 and the third belt 38, causing the turntable 40 on the left transmission rod 36 to rotate accordingly. As the turntable 40 rotates, the lever 41 periodically interacts with the arc-shaped guide groove 43 on the actuating block 42, pushing the actuating block 42 to rotate intermittently, demonstrating the principle of intermittent motion. Furthermore, the rotation of the left transmission rod 36 also drives the lower transmission wheel 46 to rotate via the left transmission wheel 37 and the fourth belt 47, thereby driving the motion frame 48 to swing, demonstrating another form of motion.

[0029] In addition, the main transmission unit 2 also drives the right transmission rod 52 to rotate through the third transmission wheel 54 and the fifth belt 55. The left conical toothed disc 56 on the right transmission rod meshes with the right conical toothed disc 57, which can further realize the transmission demonstration of different directions or speeds.

[0030] With the above-mentioned device, teachers can simultaneously demonstrate various motion forms such as planar multi-stage transmission, vertical planar composite motion, and intermittent motion on the same experimental platform. It also intuitively demonstrates the distribution and conversion process of power, which helps students to understand the principles of mechanical transmission and the motion laws of complex mechanical systems more deeply, thereby improving teaching effectiveness.

[0031] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made to the present invention without departing from the principles and spirit of the present invention as defined by the claims. Therefore, the detailed description of the embodiments in this disclosure is for explanation only and not for limiting the present invention, but rather the scope of protection is defined by the content of the claims.

Claims

1. A teaching demonstration device comprising a base (1) and a drive system, characterised in that: The drive system includes a power source (3) and a multi-stage transmission mechanism driven by the power source. The multi-stage transmission mechanism includes a main transmission unit (2) directly connected to the power source, a linkage mechanism connected to the main transmission unit (2), at least one auxiliary transmission unit connected to the main transmission unit (2) through the linkage mechanism, and a motion output unit linked to the main transmission unit (2) through the linkage mechanism. Each auxiliary transmission unit forms a power transmission chain through meshing or belt transmission. The linkage mechanism is configured to simultaneously distribute the power of the main transmission unit (2) to the auxiliary transmission units to drive the power transmission chain, and distribute the power to the motion output unit to convert part of the power into a vertical planar composite motion.

2. A teaching demonstration apparatus as claimed in claim 1, wherein The linkage mechanism includes a first transmission wheel (28) and a second transmission wheel (29) arranged in parallel on the main transmission unit (2), an input transmission wheel (31) on the auxiliary transmission unit, and a drive transmission wheel (33) on the motion output unit; wherein the first transmission wheel (28) is connected to the input transmission wheel (31) via a first belt (30); and the second transmission wheel (29) is connected to the drive transmission wheel (33) via a second belt (32).

3. A teaching demonstration apparatus as claimed in claim 1, wherein, The motion output unit includes an upper transmission rod (18), a linkage gear disk (34), a rotating gear disk (24), and a fixed platform (20). One end of the upper transmission rod (18) is fixedly connected to the drive transmission wheel (33), and the other end is rotatably mounted on the base (1). The linkage gear disk (34) is fixedly mounted on the upper transmission rod (18). The rotating gear disk (24) is hinged to the upper transmission rod (18) in a manner that is offset from the center of the linkage gear disk (34) by a connecting rod (23). The fixed platform (20) is provided with an annular mounting groove (21) with continuous teeth (22), and the rotating gear disk (24) and the teeth (22) are engaged. The rotating linkage gear disk (34) of the upper transmission rod (18) rotates synchronously, and the rotating gear disk (24) is driven to rotate in a circumferential direction along the teeth (22) by the connecting rod (23). At the same time, the linkage gear disk (34) is driven to rotate synchronously in the vertical plane.

4. A teaching demonstration apparatus as claimed in claim 1, wherein: The at least one auxiliary transmission unit includes: a first auxiliary transmission rod (4), connected to the main transmission unit (2) via the linkage mechanism; a second auxiliary transmission rod (11), linked to the first auxiliary transmission rod (4) via meshing or belt drive; a third auxiliary transmission rod (14), linked to the second auxiliary transmission rod (11) via meshing; and a fourth auxiliary transmission rod (141), rotatably mounted on the base (1) and having a sixth toothed disc (142) on it, the sixth toothed disc (142) being linked to the first toothed disc (7) via a chain; wherein Each auxiliary transmission unit forms a multi-stage power transmission chain and satisfies at least one of the following conditions: the first auxiliary transmission rod (4) is provided with a first toothed disc (7) and a second toothed disc (8), which are used to drive different transmission paths respectively; the second auxiliary transmission rod (11) is provided with a third toothed disc (12) and a fourth toothed disc (13), wherein the fourth toothed disc (13) meshes with the second toothed disc (8) of the first auxiliary transmission rod (4); the third auxiliary transmission rod (14) is provided with a fifth toothed disc (16), wherein the fifth toothed disc (16) meshes with the third toothed disc (12) of the second auxiliary transmission rod (11).

5. A teaching demonstration apparatus as claimed in claim 3, wherein: It also includes an intermittent motion mechanism, which includes a turntable assembly and a lever (42). An upper drive wheel (39) is fixedly mounted on the upper drive rod (18), and a left drive rod (36) is rotatably mounted on the base (1). A left drive wheel (37) is mounted on the left drive rod (36), and the left drive wheel (37) is connected to the upper drive wheel (39) via a third belt (38). The turntable assembly includes a turntable (40) and a lever (41). The turntable (40) is fixed to the left drive rod (36). The upper transmission rod (18) is provided with a radially extending notch (44). The inner end of the lever (41) is fixed at the center of the turntable (40) and the outer end extends to the outside of the notch (44). The actuating block (42) is rotatably set on the base (1) and its periphery is provided with four arc-shaped guide grooves (43) at equal intervals. The outer end of the lever (41) can be slidably embedded in any of the guide grooves (43). When the upper transmission rod (18) rotates, the turntable (40) is driven to rotate through the third belt (38), so that the lever (41) periodically pushes the actuating block (42) to rotate intermittently.

6. A teaching demonstration apparatus as claimed in claim 5, wherein: It also includes a lower drive wheel (46) rotatably mounted on the base (1), the lower drive wheel (46) being connected to the left drive rod (36) via a fourth belt (47); and a motion frame (48), one end of which is rotatably mounted on the base (1), and the other end of which is connected to the lower drive wheel (46).

7. A teaching demonstration apparatus as claimed in claim 1, wherein: It also includes a right transmission rod (52), which is rotatably disposed on the side of the main transmission unit (2) away from the auxiliary transmission unit; a right transmission wheel (53), which is fixed on the right transmission rod (52); a third transmission wheel (54), which is fixed on the main transmission unit (2) and connected to the right transmission wheel (53) through a fifth belt (55); a left conical toothed disc (56), which is coaxially fixed on the right transmission rod (52); and a right conical toothed disc (57), which is rotatably disposed on the base (1) and meshes with the left conical toothed disc (56).

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