Double wheel disc precession demonstration device

Abstract

This invention discloses a dual-wheel precession demonstration device, comprising a frame platform, a handwheel input section, and a display section. The handwheel input section is mounted on the frame platform and includes two handwheel input components. The display section includes a main shaft rotation component, a crossbar component, and two wheel components. The main shaft rotation component vertically passes through the platform surface and is mounted on the frame platform. The middle part of the crossbar component is connected to the upper end of the main shaft rotation component, and the crossbar component can swing up and down in a vertical plane around the upper end of the main shaft rotation component. The two wheel components are coaxially fixed at both ends of the crossbar component, and are respectively a large wheel component and a small wheel component. This invention can vividly demonstrate precession phenomena and the influence of angular velocity on precession phenomena, enhancing visitor participation. Through single-person or multi-person operation, it achieves more levels of human-computer interaction and has a high reusability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of scientific exhibits, and particularly to a double-wheel disc precession demonstration device. BACKGROUND

[0002] Precession is an important physical phenomenon, which refers to the rotation of the axis of a rotating rigid body around a certain center under the action of an external force. In order to enable learners to understand the stability characteristics of precession and the principle of precession, many precession demonstration devices for popular science and teaching have been invented. Most of the current precession demonstration devices adopt the traditional two-degree-of-freedom gyroscope structure and usually only contain one rotating gyroscope. Although these devices can obviously demonstrate the precession phenomenon, they are difficult to clearly explain the fundamental reason for the precession phenomenon. In addition, these demonstration devices have complex structure, single function, and cannot realize accurate control of the rotation speed of the gyroscope, and also lack effective interaction with the audience. SUMMARY

[0003] The present application aims to at least solve the problems in the prior art. To this end, one object of the present application is to provide a double-wheel disc precession demonstration device, which can vividly and visually demonstrate the precession phenomenon and the influence of angular velocity on the precession phenomenon, enhance the participation of visitors, and realize more levels of human-computer interaction through single or multiple operations, and has high reusability.

[0004] The double-wheel disc precession demonstration device according to an embodiment of the present application comprises

[0005] a frame table,

[0006] a hand wheel input part, which is arranged on the frame table and comprises two hand wheel input assemblies;

[0007] a display part, which comprises a primary shaft revolution assembly, a crossbar assembly and two wheel disc assemblies; the primary shaft revolution assembly vertically penetrates the table top of the frame table and is installed on the frame table, and the primary shaft revolution assembly can realize its own revolution; the middle part of the crossbar assembly is connected with the upper end of the primary shaft revolution assembly, and the crossbar assembly can swing up and down in the vertical plane around the upper end of the primary shaft revolution assembly; the two wheel disc assemblies are coaxially fixed at the two ends of the crossbar assembly; the two hand wheel input assemblies respectively one-to-one correspondingly control the rotation speeds of the two wheel disc assemblies by manual rotation; and the two wheel disc assemblies are a large wheel disc assembly and a small wheel disc assembly.

[0008] The double-wheel disc precession demonstration device of the embodiment of the present application controls two wheel disc assemblies of different sizes through two hand wheel input assemblies respectively, and the main shaft revolution assembly revolves at a slow and constant speed. The precession phenomenon is generated by the coupling of the rotation of the wheel disc assembly and the rotation of the main shaft revolution assembly, i.e. the coupling of the movement in two directions. Thus, the double-wheel disc precession demonstration device of the embodiment of the present application can have the following three demonstration modes, i.e. single-person mode, double-person cooperation mode and double-person confrontation mode. The demonstration purposes of the three demonstration modes are to make the large wheel disc assembly and the small wheel disc assembly reach the balanced state, so that the visitors can better understand the related principles of the precession phenomenon and the influence of the angular velocity on the precession phenomenon. The three demonstration modes are described below.

[0009] When the single-person mode is to be performed, the main shaft revolution assembly rotates at a slow and constant speed. At this time, the visitor can rotate the hand wheel input assembly corresponding to the small wheel disc assembly to make the small wheel disc assembly rotate, for example, in the clockwise direction. The rotation of the small wheel disc assembly in cooperation with the revolution of the main shaft will generate the precession phenomenon, that is, as the angular velocity of the small wheel disc assembly increases, the small wheel disc assembly is subjected to an increasing downward force, and as the angular velocity increases, the small wheel disc assembly will gradually lower the height. The visitor can intuitively feel the influence of the angular velocity on the precession phenomenon. Until the small wheel disc assembly and the large wheel disc assembly are at the same height, i.e. in the balanced state, the rotation of the hand wheel input assembly is stopped, and the small wheel disc assembly gradually stops rotating until the large wheel disc assembly is in the low position when it is restored to the static state, waiting for the next demonstration. That is, in the single-person mode demonstration, only one hand wheel input assembly can be used. The rotation of the hand wheel input assembly makes the small wheel disc assembly rotate, and when the hand wheel input assembly reaches a certain speed, the small wheel disc assembly pries the large wheel disc assembly, and the cross rod assembly gradually goes from unbalanced to horizontal balance to unbalanced.

[0010] When entering the two-person collaborative mode, the main spindle rotation component rotates at a slow, constant speed. Visitors can simultaneously rotate both handwheel input components, causing the large and small wheel components to rotate in opposite directions. For example, rotating the large wheel counter-clockwise and the small wheel clockwise creates an upward force on the large wheel and a downward force on the small wheel. When the large and small wheel components reach the same height, they are balanced. At this point, the handwheel input components are stopped, and the small and large wheel components gradually stop rotating until they return to a stationary position, with the large wheel component at a lower position, ready for the next demonstration. In other words, by rotating the two handwheel input components and controlling their different speeds, the rotation of the two wheel components in opposite directions is controlled, causing the crossbar component to gradually move from unbalanced to horizontally balanced and back to unbalanced. It should be noted that during the demonstration of the two-person collaborative mode, the two handwheel input components only need to reach a low speed to make the crossbar component reach a horizontal position.

[0011] When the two-player mode is selected, the main spindle rotation component rotates at a slower, constant speed. In this mode, the user can simultaneously input both handwheels to make the large and small wheel components rotate in the same direction, for example, clockwise. This creates a downward force on both components. Once they reach the same height, they achieve equilibrium. The user then stops rotating the handwheels, and the large and small wheel components gradually come to a stop until they return to a stationary position, with the large wheel component at a lower position, ready for the next demonstration. In other words, by rotating the two handwheels at different speeds, the user controls the rotation of two wheel components in the same direction, gradually moving the horizontal bar component from unbalanced to horizontally balanced and back to unbalanced. It should be noted that during the two-player mode demonstration, the handwheel input controlling the small wheel component rotates at a much higher speed than the handwheel input controlling the large wheel component.

[0012] The dual-disc precession demonstration device according to embodiments of the present invention has the following advantages: First, through the design of two turntable components, it can comprehensively demonstrate the influence of two different motion forms—the superposition of angular momentum in the same direction and the cancellation of angular momentum in opposite directions—on the precession phenomenon by utilizing these two different motion forms. Second, visitors can precisely control the rotation of the two turntable components through two handwheel input components, achieving seamless switching between different motion demonstration modes and ensuring precise coordination between the rotation speeds of the two turntable components. This design not only improves the operability of the device but also enhances the audience's participation and interactivity. The varying difficulty of rotating the handwheel input components allows visitors to intuitively experience the effect of the high-speed rotating turntable components against external interference. Third, the application of two turntable components of different sizes ensures that the inner ring quickly returns to its initial position after the precession phenomenon occurs, facilitating easier reuse. This design considers both the continuous performance of the device and user-friendliness. In summary, the dual-wheel precession demonstration device of this invention can vividly demonstrate the precession phenomenon and the influence of angular velocity on the precession phenomenon, enhance the sense of participation of visitors, and achieve more levels of human-computer interaction through single or multiple person operation, and has a high reusability.

[0013] In some embodiments, the handwheel input assembly includes a handwheel, a handwheel shaft, a first motor with an encoder, and a microcontroller. The handwheel is located above the platform of the frame table, the handwheel shaft passes through the platform of the frame table, the upper end of the handwheel shaft is fixed to the handwheel, and the lower end of the handwheel shaft is coaxially fixed to the first motor. The first motor is fixed inside the frame table, and the encoder is connected to the corresponding wheel assembly via the microcontroller.

[0014] In some embodiments, the handwheel input assembly further includes a one-way clutch located within the frame platform, the inner ring of the one-way clutch being connected to the outer peripheral surface of the handwheel shaft.

[0015] In some embodiments, the spindle revolution assembly includes a second motor, a spindle, and a horizontal lever shaft; the second motor is disposed within the frame platform and connected to the microcontroller; the spindle vertically passes through the platform surface of the frame platform; the lower end of the spindle is connected to the second motor so that the second motor drives the spindle to rotate; the upper end of the spindle supports the horizontal lever shaft; the horizontal lever shaft passes through the middle of the crossbar assembly so that the crossbar assembly can swing up and down in the vertical plane around the horizontal lever shaft.

[0016] In some embodiments, the upper end of the main shaft is fixed with an upward-facing concave limiting block, and the two ends of the horizontal prying shaft are fixed on the opposite side walls of the concave limiting block.

[0017] In some embodiments, the crossbar assembly includes a crossbar, the middle portion of which is rotatably mounted on the horizontal pry shaft in a vertical plane, and the two ends of the crossbar are respectively connected to the two wheel assemblies.

[0018] In some embodiments, the wheel assembly includes a wheel and a third motor, the third motor being fixed between the corresponding end of the crossbar assembly and the wheel.

[0019] In some embodiments, the third motor is coaxially fixed to the axle of the corresponding wheel disc via a coupling.

[0020] In some embodiments, the roulette wheel includes an outer roulette wheel and an inner roulette wheel, the disc body of the inner roulette wheel is coaxially fixed in the outer roulette wheel, and the axle of the inner roulette wheel is the axle of the roulette wheel.

[0021] In some embodiments, the wheel assembly further includes a motor housing, a bearing housing, and a fourth bearing; the motor is fixed inside the motor housing, one end of the motor housing is fixed to the end of the corresponding crossbar, the other end of the motor housing is fixed to one end of the bearing housing, and the fourth bearing is disposed between the inner peripheral wall of the other end of the bearing housing and the wheel axle of the wheel.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a schematic diagram of the structure of the demonstration part of the dual-wheel precession demonstration device according to an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the handwheel input component of the dual-wheel precession demonstration device according to an embodiment of the present invention.

[0026] Figure 3 This is a cross-sectional view of the connection between the wheel assembly and the crossbar assembly of the dual-wheel advance demonstration device according to an embodiment of the present invention.

[0027] Figure 4 This is a cross-sectional view of the connection between the concave limiting block and the crossbar assembly of the dual-wheel precession demonstration device according to an embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the installation of the concave limiting block and the main shaft of the dual-wheel precession demonstration device according to an embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram of the installation of the main shaft and the main shaft housing of the dual-disc precession demonstration device according to an embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram of the overall structure of the dual-wheel precession demonstration device according to an embodiment of the present invention.

[0031] Reference numerals: Handwheel input assembly 100; Handwheel 101; Crank handle 1011; Handwheel shaft 102; First motor 103; One-way clutch 104; Handwheel shaft sleeve 105; Coupling 106; First motor bracket 107; Main shaft revolution assembly 200; Third bearing 201; Main shaft 202; Horizontal pry shaft 203; Concave limiting block 204; Main shaft housing 205; End cover 206; First bearing 207; Pin 208; Crossbar assembly 300; Crossbar 301; Horizontal shaft 3011; Crossbar arm 3012; Wheel assembly 400; Large wheel assembly 410; Small wheel assembly 420; Wheel 401; Inner wheel 4011; Outer wheel 4012; Third motor 402; Motor housing 403; Bearing housing 404; Fourth bearing 405; Frame platform 500; Table surface 501. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below. Examples of these 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. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] The following is combined with Figures 1 to 7 The present invention describes a dual-wheel precession demonstration device according to an embodiment of the present invention.

[0034] like Figures 1 to 7 As shown, the dual-wheel advance demonstration device according to an embodiment of the present invention includes a frame platform 500, a handwheel input section, and a display section. The handwheel input section is mounted on the frame platform 500 and includes two handwheel input components 100. The display section includes a spindle revolution component 200, a crossbar component 300, and two wheel components 400. The spindle revolution component 200 passes vertically through the platform 501 of the frame platform 500 and is mounted on the frame platform 500. The spindle revolution component 200 can revolve itself. The middle part of the crossbar component 300 is connected to the upper end of the spindle revolution component 200. The crossbar component 300 can swing up and down in the vertical plane around the upper end of the spindle revolution component 200. The two wheel components 400 are coaxially fixed at both ends of the crossbar component 300. The two handwheel input components 100 control the rotation speed of the two wheel components 400 one by one by manual rotation. The two wheel components 400 are a large wheel component 410 and a small wheel component 420, respectively.

[0035] Specifically, the frame platform 500 is used to integrate and install the handwheel input part, the display part, etc. The frame platform 500 has a tabletop 501, the space above the tabletop 501 is for display, and the space below the tabletop 501 can be used to support functional components that do not need to be displayed.

[0036] The handwheel input section is mounted on the frame platform 500 and includes two handwheel input components 100. These two handwheel input components 100 can be positioned on one side of the frame platform 500. Visitors can control the rotation of the wheel assembly 400 through the handwheel input components 100. Specifically, the two handwheel input components 100 can respectively control the rotation of the large wheel assembly 410 and the small wheel assembly 420, achieving seamless switching between different motion modes of the wheel assembly 400 and ensuring precise coordination between the rotational speeds of the large wheel assembly 410 and the small wheel assembly 420. The handwheel input components 100 improve the operability of the dual-wheel precession demonstration device and enhance visitor interactivity. By observing the ease or difficulty of rotating the handwheel input components 100, visitors can intuitively experience the effectiveness of the wheel assembly 400 in resisting external interference, allowing them to clearly understand the transmission phenomenon.

[0037] The demonstration section includes a spindle revolution assembly 200, a crossbar assembly 300, and two wheel assemblies 400. The spindle revolution assembly 200 is vertically inserted through the platform 501 of the frame 500 and mounted on the frame 500, enabling it to revolve. The middle part of the crossbar assembly 300 is connected to the upper end of the spindle revolution assembly 200, allowing it to swing up and down in a vertical plane around the upper end of the spindle revolution assembly 200. The two wheel assemblies 400 are coaxially fixed at both ends of the crossbar assembly 300. Two handwheel input assemblies 100 control the rotation speed of the two wheel assemblies 400 by manual rotation, with the two wheel assemblies 400 being a large wheel assembly 410 and a small wheel assembly 420, respectively. Understandably, since the large wheel assembly 410 and the small wheel assembly 420 are located at opposite ends of the crossbar assembly 300, and the weight of the large wheel assembly 410 is greater than that of the small wheel assembly 420, and the height of the large wheel assembly 410 is lower than that of the small wheel assembly 420, the large wheel assembly 410 is in a lower position when the visitor stops turning the handwheel input assembly 100 and returns to a stationary state, which is convenient for the next demonstration and has a high reuse rate. The design using two wheel assemblies 400 can also utilize the superposition of angular momentum in the same direction and the cancellation of angular momentum in opposite directions to fully demonstrate the influence of angular momentum on precession.

[0038] The dual-wheel precession demonstration device of this invention controls two wheel assemblies 400 of different sizes through two handwheel input components 100 respectively. The main shaft revolution assembly 200 revolves at a relatively slow and constant speed. The precession phenomenon is generated by the coupling of the rotation of the wheel assembly 400 and the rotation of the main shaft revolution assembly 200, that is, the motion coupling in two directions.

[0039] Therefore, as Figures 1 to 4 and Figure 7 As shown, the dual-wheel precession demonstration device according to an embodiment of the present invention can have the following three demonstration modes: single-person mode, two-person collaborative mode, and two-person adversarial mode. The purpose of these three demonstration modes is to achieve a balanced state between the large wheel assembly 410 and the small wheel assembly 420, so that visitors can better understand the relevant principles of precession and the influence of angular velocity on precession. The three demonstration modes are described below.

[0040] When in single-user mode, the main spindle revolution assembly 200 rotates at a slow, constant speed. Visitors can rotate the handwheel input assembly 100 corresponding to the small wheel assembly 420 to make it rotate, for example, clockwise. The rotation of the small wheel assembly 420, in conjunction with the revolution of the main spindle 202, produces precession. That is, as the angular velocity of the small wheel assembly 420 increases, it is equivalent to the small wheel assembly 420 experiencing a downward increasing force. As the angular velocity increases, the small wheel assembly 420 gradually decreases in height. Visitors can directly perceive the effect of angular velocity on precession. This continues until the small wheel assembly 420 and the large wheel assembly 410 are at the same height, at which point they are in equilibrium. Then, the handwheel input assembly 100 is stopped, and the small wheel assembly 420 gradually stops rotating until it returns to a stationary position where the large wheel assembly 410 is in a low position, ready for the next demonstration. In other words, during the single-player mode demonstration, only one handwheel input component 100 can be used. Turning the handwheel input component 100 causes the small wheel component 420 to rotate. When the handwheel input component 100 reaches a certain speed, the small wheel component 420 pries the large wheel component 410, and the crossbar component 300 gradually goes from unbalanced to horizontally balanced and then back to unbalanced.

[0041] When entering the two-person collaborative mode, the main spindle revolution component 200 rotates at a slow, constant speed. At this time, the visitor can simultaneously rotate the two handwheel input components 100, causing the large wheel component 410 and the small wheel component 420 to rotate simultaneously and in opposite directions. For example, the large wheel component 410 rotates counterclockwise and the small wheel component 420 rotates clockwise. Thus, the counterclockwise rotation of the large wheel component 410 is equivalent to receiving an upward force, and the clockwise rotation of the small wheel component 420 is equivalent to receiving a downward force. When the large wheel component 410 and the small wheel component 420 are at the same height, they reach equilibrium. The rotation of the handwheel input component 100 stops, and the small wheel component 420 and the large wheel component 410 gradually stop rotating until they return to a stationary state. At this point, the large wheel component 410 is in a low position, ready for the next demonstration. In other words, by rotating the two handwheel input components 100 and controlling their different rotation speeds, the rotation of the two wheel components 400, which rotate in opposite directions, is controlled, causing the crossbar component 300 to gradually move from unbalanced to level and back to unbalanced. It should be noted that in the two-person collaborative mode demonstration, the two handwheel input components 100 only need to reach a relatively low speed to make the crossbar component 300 level.

[0042] When the two-player mode is selected, the main spindle revolution component 200 rotates at a slow, constant speed. In this mode, the user can simultaneously input both handwheels 100 to make the large wheel component 410 and the small wheel component 420 rotate in the same direction, for example, clockwise. This is equivalent to the large wheel component 410 and the small wheel component 420 experiencing a downward force. Once they reach the same height, they achieve equilibrium. The user then stops rotating the handwheel input component 100, and the small wheel component 420 and the large wheel component 410 gradually stop rotating until they return to a stationary position, with the large wheel component 410 in a low position, ready for the next demonstration. In other words, by rotating the two handwheel input components 100 and controlling their different rotation speeds, the user can control the rotation of the two wheel components 400 in the same direction, causing the crossbar component 300 to gradually move from unbalanced to horizontally balanced and back to unbalanced. It should be noted that during the two-player battle mode demonstration, the rotation speed of the handwheel input component 100 controlling the small wheel component 420 is much higher than the rotation speed of the handwheel input component 100 controlling the large wheel component 410.

[0043] The dual-disc precession demonstration device according to an embodiment of the present invention has the following advantages: First, through the design of the two turntable components 400, it is possible to fully demonstrate the influence of the superposition of angular momentum in the same direction and the cancellation of angular momentum in opposite directions on the precession phenomenon by utilizing two different motion forms: superposition of angular momentum in the same direction and cancellation of angular momentum in opposite directions. Second, visitors can precisely control the rotation of the two turntable components 400 through two handwheel input components 100, achieving seamless switching between different motion demonstration modes and ensuring precise coordination between the rotation speeds of the two turntable components 400. This design not only improves the operability of the device but also enhances the audience's participation and interactivity. The varying ease of rotation of the handwheel input components 100 allows visitors to intuitively experience the effect of the high-speed rotating turntable component 400 against external interference. Third, the application of two turntable components 400 of different sizes ensures that the inner ring quickly returns to its initial position after the precession phenomenon occurs, facilitating easier reuse. This design considers both the continuous performance of the device and user-friendliness. In summary, the dual-wheel precession demonstration device of this invention can vividly demonstrate the precession phenomenon and the influence of angular velocity on the precession phenomenon, enhance the sense of participation of visitors, and achieve more levels of human-computer interaction through single or multiple person operation, and has a high reusability.

[0044] In some embodiments, such as Figure 2 As shown, the handwheel input assembly 100 includes a handwheel 101, a handwheel shaft 102, a first motor 103 with an encoder, and a microcontroller (not shown in the figure). The handwheel 101 is located above the platform 501 of the frame platform 500. The handwheel shaft 102 passes through the platform 501 of the frame platform 500. The upper end of the handwheel shaft 102 is fixed to the handwheel 101, and the lower end of the handwheel shaft 102 is coaxially fixed to the first motor 103. The first motor 103 is fixed inside the frame platform 500. The encoder is connected to the corresponding wheel assembly 400 via the microcontroller. It should be noted that the connection between the handwheel shaft 102 and the first motor 103 includes damping, so that the faster the rotation speed of the first motor 103, the greater the force required for rotation, exhibiting a stronger resistance.

[0045] Specifically, the handwheel input component 100 is located near the visitor, allowing for direct operation. When the visitor turns the handwheel 101, it drives the handwheel shaft 102 to rotate. The encoder on the first motor 103 obtains the rotational speed of the handwheel 101, and the microcontroller uses this speed to rotate the wheel assembly 400 at a specific speed. By incorporating a first motor 103 with an encoder instead of a direct encoder, the ease with which visitors can intuitively perceive the speed by turning the handwheel 101, while also preventing the handwheel 101 from rotating too quickly and damaging the machine.

[0046] In some embodiments, the handwheel input assembly 100 further includes a one-way clutch 104 located within the frame platform 500, the inner ring of which is connected to the outer peripheral surface of the handwheel shaft 102.

[0047] Specifically, the use of the one-way clutch 104 ensures that the handwheel input assembly 100 can only rotate in one direction, preventing damage to the equipment caused by visitors reversing the handwheel 101.

[0048] In some embodiments, the upper surface of the handwheel 101 is provided with a crank 1011 to facilitate visitors to turn the handwheel 101.

[0049] In some embodiments, the handwheel input assembly 100 further includes a handwheel bushing 105, through which the handwheel shaft 102 is mounted on the table surface 501 of the frame platform 500.

[0050] Specifically, the handwheel bushings 105 are distributed on the upper and lower sides of the table surface 501 of the frame platform 500 and are fixed by bolts, making the connection firm and easy to install and disassemble.

[0051] In some embodiments, the handwheel input assembly 100 further includes a coupling 106, wherein the lower end of the handwheel shaft 102 is coaxially fixed to the shaft of the first motor 103 via the coupling 106. The coupling 106 can coaxially fix the handwheel shaft 102 and the shaft of the first motor 103, so that the rotation of the handwheel shaft 102 can be transmitted to the first motor 103.

[0052] In some embodiments, the handwheel input assembly 100 further includes a first motor bracket 107, wherein the first motor 103 is fixed within the frame platform 500 by the first motor bracket 107 to prevent the first motor 103 from being displaced when the handwheel 101 rotates.

[0053] In some embodiments, the spindle revolution assembly 200 includes a second motor (not shown in the figure), a spindle 202, and a horizontal lever shaft 203. The second motor is disposed within the frame platform 500 and connected to a microcontroller. The spindle 202 vertically passes through the platform surface 501 of the frame platform 500. The lower end of the spindle 202 is connected to the second motor, so that the second motor drives the spindle 202 to rotate. The upper end of the spindle 202 supports the horizontal lever shaft 203, which passes through the middle of the crossbar assembly 300, allowing the crossbar assembly 300 to swing up and down in the vertical plane around the horizontal lever shaft 203. The bottom of the spindle 202 is directly connected to the second motor to control its revolution, and a conductive slip ring is installed for circuit connection.

[0054] In some embodiments, the second motor is a stepper motor.

[0055] Specifically, the second motor is a high-power stepper motor, which can generate a precession angular velocity that makes the spindle 202 rotate.

[0056] In some embodiments, the upper end of the main shaft 202 is fixed with an upward-facing concave limiting block 204, and the two ends of the horizontal prying shaft 203 are fixed on the opposite side walls of the concave limiting block 204.

[0057] Understandably, the combination of the concave limiting block 204 and the horizontal prying shaft 203 can limit the rotation of the crossbar 301, ensuring that the crossbar 301 has a clear direction of rotation and can only move up and down in the plane.

[0058] In some embodiments, the two ends of the horizontal pry shaft 203 are installed in the mounting holes on the opposite side walls of the concave limiting block 204 and fixed by bolts to ensure that the horizontal pry shaft 203 is firmly installed and will not be displaced, while being easy to install and disassemble and convenient to maintain.

[0059] In some embodiments, such as Figure 5 As shown, the bottom of the concave limiting block 204 has a bottom mounting hole. The upper end of the main shaft 202 is inserted into the bottom mounting hole and is axially positioned by the first shoulder on the main shaft 202. The two sides of the concave limiting block 204 are also fixed to the upper end of the main shaft 202 by pins 208. The pins 208 can be short cylindrical pins to leave room for electrical wiring in the shaft. The two ends of the pins 208 are held in place by set screws to prevent them from coming out, ensuring that the concave limiting block 204 will not be displaced and ensuring the normal operation of the dual-wheel advance demonstration device.

[0060] In some embodiments, such as Figure 6 As shown, the spindle revolution assembly 200 also includes a spindle housing 205, which is fixed to the table surface 501 of the frame platform 500 to prevent displacement of the spindle housing 205. The spindle 202 is rotatably inserted into the spindle housing 205, which protects the spindle 202.

[0061] In some embodiments, the spindle revolution assembly 200 further includes an end cap 206 and a first bearing 207. The end cap 206 is fixed to the end face of the spindle housing 205, for example, by screws. The first bearing 207 is located inside the spindle housing 205 and is mounted on the spindle 202 via the end cap 206 and a second shoulder on the spindle 202. Specifically, the first bearing 207 located at the upper end inside the spindle housing 205 is a thrust bearing, and the second bearing located at the lower end inside the spindle housing 205 is a deep groove ball bearing. The bearings on the spindle housing 205 allow the spindle 202 to rotate even when the spindle housing 205 is held vertically upward.

[0062] In some embodiments, the crossbar assembly 300 includes a crossbar 301, the middle part of which is rotatably mounted on the horizontal prying shaft 203 in the vertical plane, and the two ends of the crossbar 301 are respectively connected to two wheel assemblies 400 to facilitate the rotation of the wheel assemblies 400 during the demonstration.

[0063] In some embodiments, the crossbar 301 includes a horizontal shaft 3011 and two horizontal arms 3012. The horizontal shaft 3011 is rotatably mounted on a horizontal prying shaft 203 in a vertical plane. Both ends of the horizontal shaft 3011 are fixed to one end of each of the two horizontal arms 3012, and the other ends of each horizontal arm 3012 are connected to a corresponding wheel assembly 400. The wheel assembly 400 is relatively heavy, and the use of the horizontal shaft 3011 ensures that the dual-wheel movement demonstration device is not easily damaged during use.

[0064] In some embodiments, a third bearing 201 is provided between the horizontal shaft 3011 and the horizontal pry shaft 203.

[0065] Specifically, the third bearing 201 is a deep groove ball bearing. The inner ring of the third bearing 201 is axially positioned by a positioning sleeve, and the outer ring of the third bearing 201 is axially positioned by a shoulder on the inner circumferential wall of the horizontal shaft 3011, a positioning ring, and an outer ring fixed on one side of the horizontal shaft 3011, so as to facilitate the rotation of the horizontal shaft 3011 on the horizontal prying shaft 203.

[0066] In some embodiments, the wheel assembly 400 includes a wheel 401 and a third motor 402. The third motor 402 is fixed between the end of the corresponding crossbar assembly 300 and the wheel 401. The output end of the third motor 402 is connected to the wheel 401, and the third motor 402 can rotate the wheel 401.

[0067] In some embodiments, the third motor 402 is coaxially fixed with the axle of the corresponding wheel 401 via a coupling 106. The third motor 402 can output a corresponding speed proportional to the speed of the handwheel 101, so that the corresponding wheel 401 rotates.

[0068] In some embodiments, the roulette wheel 401 includes an outer roulette wheel 4012 and an inner roulette wheel 4011. The disc body of the inner roulette wheel 4011 is coaxially fixed in the outer roulette wheel 4012, and the axle of the inner roulette wheel 4011 is the axle of the roulette wheel 401.

[0069] Specifically, the inner disc 4011 and the outer disc 4012 are fixed together by bolts, which is firm and reliable, ensuring that the inner disc 4011 can drive the outer disc 4012 to rotate when it rotates.

[0070] In some embodiments, the wheel assembly 400 further includes a motor housing 403, a bearing housing 404, and a fourth bearing 405; a motor is fixed inside the motor housing 403, one end of the motor housing 403 is fixed to the end of the corresponding crossbar 301, the other end of the motor housing 403 is fixed to one end of the bearing housing 404, and the fourth bearing 405 is disposed between the inner peripheral wall of the other end of the bearing housing 404 and the wheel axle of the wheel 401 so that the wheel 401 can rotate.

[0071] In some embodiments, the fourth bearing 405 is a deep groove ball bearing. The inner ring of the fourth bearing 405 is positioned by a shoulder on the axle of the wheel 401 and a retaining ring fixed to the axle of the wheel 401; the outer ring of the fourth bearing 405 is axially positioned by a shoulder on the inner peripheral wall of the bearing housing 404 and a ring cap fixed to the other end of the bearing housing 404. The deep groove ball bearing ensures that it can bear the weight of the wheel and will not be damaged during the demonstration.

[0072] In some embodiments, a transparent cover is also included, which is disposed above the platform 501 of the frame platform 500. The portion of the spindle revolution assembly 200 above the platform 501 of the frame platform 500, the crossbar assembly 300, and the two wheel assemblies 400 are located inside the transparent cover, while the handwheels 101 of the two handwheel input assemblies 100 are located outside the transparent cover. The transparent cover can effectively protect the personal safety of visitors.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A dual-wheel precession demonstration device, characterized in that, include: Frame platform, The handwheel input section is mounted on the frame platform and includes two handwheel input components; The demonstration section includes a main spindle revolving assembly, a crossbar assembly, and two wheel assemblies. The main spindle revolving assembly is vertically inserted through the platform of the frame and mounted on the frame, enabling it to revolve. The middle part of the crossbar assembly is connected to the upper end of the main spindle revolving assembly, allowing it to swing up and down in a vertical plane around the upper end of the main spindle revolving assembly. The two wheel assemblies are coaxially fixed at both ends of the crossbar assembly. Two handwheel input assemblies, designated as a large wheel assembly and a small wheel assembly, are manually rotated to control the rotation speed of the two wheel assemblies, one for each wheel.

2. The dual-wheel precession demonstration device according to claim 1, characterized in that, The handwheel input assembly includes a handwheel, a handwheel shaft, a first motor with an encoder, and a microcontroller. The handwheel is located above the platform of the frame table, the handwheel shaft passes through the platform of the frame table, the upper end of the handwheel shaft is fixed to the handwheel, and the lower end of the handwheel shaft is coaxially fixed to the first motor. The first motor is fixed inside the frame table, and the encoder is connected to the corresponding wheel assembly through the microcontroller.

3. The dual-wheel precession demonstration device according to claim 2, characterized in that, The handwheel input assembly also includes a one-way clutch, which is located within the frame platform, and the inner ring of the one-way clutch is connected to the outer peripheral surface of the handwheel shaft.

4. The dual-wheel precession demonstration device according to claim 2, characterized in that, The spindle revolution assembly includes a second motor, a spindle, and a horizontal lever shaft. The second motor is disposed inside the frame platform and connected to the microcontroller. The spindle passes vertically through the platform surface of the frame platform. The lower end of the spindle is connected to the second motor so that the second motor drives the spindle to rotate. The upper end of the spindle supports the horizontal lever shaft. The horizontal lever shaft passes through the middle of the crossbar assembly so that the crossbar assembly can swing up and down in the vertical plane around the horizontal lever shaft.

5. The dual-wheel precession demonstration device according to claim 4, characterized in that, The upper end of the main shaft is fixed with an upward-facing concave limiting block, and the two ends of the horizontal prying shaft are fixed on the opposite side walls of the concave limiting block.

6. The dual-wheel precession demonstration device according to claim 4, characterized in that, The crossbar assembly includes a crossbar, the middle part of which is rotatably mounted on the horizontal prying shaft in a vertical plane, and the two ends of the crossbar are respectively connected to the two wheel assemblies.

7. The dual-wheel precession demonstration device according to claim 4, characterized in that, The wheel assembly includes a wheel and a third motor, the third motor being fixed between the corresponding end of the crossbar assembly and the wheel.

8. The dual-wheel precession demonstration device according to claim 7, characterized in that, The third motor is fixed coaxially with the axle of the corresponding wheel disc via a coupling.

9. The dual-wheel precession demonstration device according to claim 8, characterized in that, The roulette wheel includes an outer roulette wheel and an inner roulette wheel. The inner roulette wheel is coaxially fixed in the outer roulette wheel, and the axle of the inner roulette wheel is the axle of the roulette wheel.

10. The dual-wheel precession demonstration device according to claim 4, characterized in that, The wheel assembly also includes a motor housing, a bearing housing, and a fourth bearing; the motor is fixed inside the motor housing, one end of the motor housing is fixed to the end of the corresponding crossbar, the other end of the motor housing is fixed to one end of the bearing housing, and the fourth bearing is disposed between the inner peripheral wall of the other end of the bearing housing and the wheel axle of the wheel.

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