Visual illusion demonstration device based on graph-sky double circles

Abstract

The invention discloses and relates to a visual illusion demonstration device based on a graph-ski double circle, and belongs to an optical science popularization education instrument. A visual illusion demonstration device based on Figure and Stronus double circles comprises an exhibition stand, a track device, a magnet disc, a planetary gear device and a control panel. An audience controls the servo motor to rotate forwards or backwards through the control panel, the sun wheel is driven to rotate forwards or backwards, then the planet wheels are driven to rotate forwards or backwards, and the upper planet wheels are meshed with the gears to move anticlockwise along the upper inner gears. As the magnet disc is fixedly connected with the upper planet wheel, based on the Figuus bicircle theory, the circular magnet adsorbs the metal ball to do linear reciprocating motion along the groove track; when all the metal balls independently reciprocate in the respective groove tracks, a small circle formed by all the metal balls can form a clockwise or rolling visual illusion effect on the track disc. The scientific and technological exhibition hall demonstration device well solves the problem and makes up for the situation that a scientific and technological exhibition hall is lack of the demonstration device.

Description

TECHNICAL FIELD

[0001] The present design relates to the technical field of visual illusion, in particular to a visual illusion demonstration device based on Tus double circle, which belongs to the optical popular science education instrument. BACKGROUND

[0002] The Tus double circle theory is an astronomical mathematical model proposed by Nasir al-Din Tusi, a Persian astronomer and mathematician in the 13th century, in his book "Commentary on the Almagest" in 1247. This theory not only solves the key problems in classical astronomy, but also has a significant impact on the later Copernicus' astronomical research. The core of this model is two coplanar circular structures: a small circle is inscribed in a large circle, and the diameter of the large circle is exactly twice that of the small circle. When the two circles move at a uniform speed in opposite directions, and the rotation speed of the small circle is twice that of the large circle (i.e. the large circle rotates 1 circle while the small circle rotates 2 circles), a fixed point on the circumference of the small circle will make a back-and-forth straight line motion along a diameter of the large circle. From a mathematical point of view, this model can accurately describe the trajectory and law of this motion through complex number expressions. At the same time, it can also be interpreted as a rolling curve, and the tangent point between the small circle and the large circle during rolling satisfies the non-slip motion condition.

[0003] In the past, when observing this phenomenon, it was mostly in the form of video or picture, and the content was relatively fixed. According to the Tus double circle theory, the present invention adopts the traditional planetary gear structure in mechanical design, which can realize the straight-line reciprocating motion of multiple metal balls along the diameter of the large circle. When all the metal balls move along the diameter with the small circle, the visual illusion phenomenon of the small circle composed of all the metal balls rolling inside the large circle is generated, which fills the gap in the field of popular science devices. SUMMARY

[0004] The purpose of the present invention is to provide a more intuitive and vivid observation of the visual illusion demonstration device based on Tus double circle.

[0005] The technical solution of the present invention is a visual illusion demonstration device based on Tus double circle, which consists of an exhibition stand, a track device, a magnet disc, a planetary gear device, and a control panel. The exhibition stand is made of metal, with a tabletop made of artificial stone. Installation holes are provided on the surface of the tabletop. The track device has ten evenly distributed grooved tracks on the surface of the track disc with the center as the origin. Metal balls can move along the grooved tracks in a straight line. The track device is fixedly connected to the surface of the exhibition stand by screws. The magnet disc is fixedly connected to the upper planetary gear. The magnet disc rotates with the upper planetary gear and the upper internal gear. The gear ring of the planetary gear device is fixedly connected to the surface of the exhibition stand by screws, and is coaxial with the track device. The control panel is fixedly connected to the tabletop of the exhibition stand.

[0006] The track device comprises a track disc, a ball bin, an electromagnet and a metal ball.

[0007] The track disc is made of a non-ferromagnetic material and has ten groove tracks on the surface, which are numbered 1-10 clockwise.

[0008] The ball bin is a semi-spherical hollow structure and is located at one end of the groove track and slightly higher than the track disc.

[0009] The electromagnet is located directly below the ball bin and has magnetism when powered on to fix the metal ball in the ball bin.

[0010] The metal ball is made of a ferromagnetic material and has ten numbers 1-10 clockwise.

[0011] The magnet disc comprises a disc holder and a circular magnet.

[0012] The disc holder is fixedly connected with the upper planetary gear and has the same outer diameter as the upper planetary gear.

[0013] The circular magnet is evenly arranged at the edge of the disc holder with ten numbers 1-10 clockwise.

[0014] The planetary gear device comprises an inner gear device, a sun gear, a planetary gear, an auxiliary wheel, a planetary carrier and a servo motor.

[0015] The inner gear device middle part is a gear ring, the gear ring is a double-layer circular structure, the upper layer outer diameter is equal to the upper inner gear outer diameter, the lower layer is provided with a bearing, the bearing inner diameter is equal to the lower inner gear outer diameter, the gear ring bottom is provided with a circular hole, and the circular hole diameter is greater than the servo motor bearing diameter.

[0016] The upper inner gear is a 204-tooth straight-tooth inner gear, the module is 2, and the upper inner gear is fixedly connected with the gear ring upper layer.

[0017] The lower inner gear is a 153-tooth straight-tooth inner gear, the module is 2, and the lower inner gear is connected with the gear ring lower layer bearing and can rotate around the gear ring axis center by 360 degrees.

[0018] The sun gear is a 51-tooth spur gear, the module is 2, is connected with the sun shaft on the planet carrier through the shaft hole, can rotate around the sun shaft axis, and is respectively in gear meshing with the auxiliary wheel and the lower planet wheel.

[0019] The planet wheel is a double-layer spur gear structure, is connected with the planet shaft on the planet carrier through the shaft hole, can rotate around the planet shaft axis, the upper layer upper planet wheel is a 102-tooth spur gear, the module is 2, the upper planet wheel is in gear meshing with the upper inner gear, and the lower layer lower planet wheel is a 51-tooth spur gear, the module is 2, and the lower planet wheel is in gear meshing with the lower inner gear and the sun gear.

[0020] The auxiliary wheel is a 51-tooth spur gear, the module is 2, is connected with the auxiliary shaft on the planet carrier through the shaft hole, rotates along the auxiliary shaft axis, and is respectively in gear meshing with the sun gear and the lower inner gear.

[0021] The planet carrier adopts a three-arm frame structure, the three arms are uniformly distributed at 120 degrees, the frame center is provided with a sun shaft, the planet shaft and the auxiliary shaft are respectively arranged on each arm, and the planet shaft is slightly higher than the auxiliary shaft; the distances from the planet shaft and the auxiliary shaft on the three arms to the sun shaft axis center are equal, the distances are equal to the pitch circle radius of the upper planet wheel, and a motor shaft hole is reserved at the bottom of the planet carrier.

[0022] The servo motor is fixedly connected with the gear ring bottom, the motor shaft is connected with the planet carrier motor shaft hole, and drives the sun gear to rotate.

[0023] The control panel supports multiple control mode selection, can drive the servo motor to operate through the control circuit, and can control the on-off of the ten electromagnets.

[0024] The present application has the following beneficial effects: Based on the theory of two concentric circles: the smaller circle is tangent to the larger circle and the diameter of the larger circle is twice that of the smaller circle. When the two circles move at a uniform speed in opposite directions, and the rotation speed of the smaller circle is twice that of the larger circle (i.e. when the larger circle rotates 1 circle, the smaller circle rotates 2 circles synchronously), a fixed point on the circumference of the smaller circle will make a reciprocating linear motion along a diameter of the larger circle.

[0025] The present scheme adopts a planetary gear structure, and the pitch circle diameter of the upper internal gear is set to be twice the pitch circle diameter of the upper planetary gear. When the upper planetary gear moves in tangential engagement around the upper internal gear, the circular magnet on the magnet disc is precisely positioned at the pitch circle circumference of the upper planetary gear. This design fully conforms to the theory of two concentric circles, and can drive the circular magnet to make a linear reciprocating motion along a specific diameter of the upper internal gear. Precise control is achieved through a flat plate control circuit: when the target circular magnet moves to directly below the groove track, the corresponding electromagnet is powered off, the metal ball rolls into the groove track under the action of its own gravity, and is then attracted by the circular magnet and moves synchronously with it in the groove track. After sequentially releasing all the metal balls, although each metal ball moves independently in its own groove track, the small circle formed by multiple metal balls will create a visual illusion effect of rolling on the track disc. When the circular magnet moves the metal ball to the nearest end of the ball bin, the electromagnet is powered on, and its magnetic force is much greater than that of the circular magnet. The metal ball is attracted and sucked into the ball bin, waiting for the next release cycle.

[0026] The device of the present application solves this problem well, and allows the audience to experience the formation and change process of the theory of two concentric circles and the corresponding visual illusion in a real and vivid way, increases the scientificity and interest, and makes up for the lack of such demonstration devices in science and technology exhibition halls. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic view of a visual illusion demonstration device based on two concentric circles.

[0028] Figure 2 It is a structural view of a visual illusion demonstration device based on two concentric circles.

[0029] Figure 3 It is a schematic view of a track disc device.

[0030] Figure 4 It is a schematic view of a magnet disc.

[0031] Figure 5 It is a schematic view of a planetary gear device.

[0032] Figure 6 It is a schematic view of a planetary gear device from the bottom.

[0033] Figure 7 It is a schematic view of a planet carrier.

[0034] Wherein, 1, the exhibition stand, 2, track disc device, 21, track disc, 211, groove track, 22, ball bin, 23, electromagnet, 24, metal ball, 3, magnet disc, 31, disc holder, 32, circular magnet, 4, planetary gear device, 41, inner gear device, 411, gear ring, 412, upper inner gear, 413, lower inner gear, 42, sun gear, 43, planet gear, 431, upper planet gear, 432, lower planet gear, 44, auxiliary wheel, 45, planet carrier, 451, support, 452 sun shaft, 453, planet shaft, 454, auxiliary shaft, 455, motor shaft hole, 46, servo motor, 5, control panel. DETAILED DESCRIPTION

[0035] The present application will be described in detail below in conjunction with the drawings and specific examples.

[0036] As shown in Figure 1 and Figure 2 , the technical solution described in the present application is a visual illusion demonstration device based on Tus double circle, which consists of an exhibition stand 1, a track device 2, a magnet disc 3, a planetary gear device 4, and a control panel 5. The exhibition stand 1 is made of metal, the tabletop is made of artificial stone, and mounting holes are provided on the surface of the tabletop. The track device 2 has ten groove tracks evenly distributed on the surface of the track disc 21 with the center as the origin point, and the metal ball 24 can move linearly along the groove track. The track device 2 is fixedly connected to the surface of the exhibition stand 1 by screws. The magnet disc 3 is fixedly connected to the upper planet gear 431, and the magnet disc 3 rotates with the upper planet gear 431 and the upper inner gear 412. The gear ring 411 of the planetary gear device 4 is fixedly connected to the surface of the exhibition stand 1 by screws, and is coaxial with the track device 2. The control panel 5 is fixedly connected to the tabletop of the exhibition stand 1.

[0037] As shown in Figure 3 , the track device 2 includes a track disc 21, a ball bin 22, an electromagnet 23, and a metal ball 24.

[0038] The track disc 21 is made of non-ferromagnetic material, and has ten groove tracks 211 on the surface, which are numbered clockwise as 1-10 and evenly arranged on the surface of the track disc 21 with the center as the origin point.

[0039] The ball bin 22 is a semi-spherical hollow structure located at one end of the groove track and slightly higher than the track disc 21. The front end is provided with a gentle slope connected to the groove track 211. When the electromagnet 23 is powered off, the metal ball 24 can roll into the groove track 211 from the ball bin 22 due to gravity. There are ten ball bins 22, numbered clockwise as 1-10, corresponding to the groove tracks 211.

[0040] The electromagnet 23 is located directly below the ball bin 22, and when the electromagnet 23 is powered, it has magnetism to fix the metal ball 24 in the ball bin 22, and when the electromagnet 23 is powered off, the magnetism disappears, and the metal ball 24 rolls into the groove track 211 due to its own gravity; when the metal ball 24 moves back to the front end of the ball bin 22, the electromagnet 23 is powered again, and the magnetism of the electromagnet 23 is much greater than that of the circular magnet 32, so that the metal ball 24 is reabsorbed into the ball bin 22 and fixed. The number of electromagnets 23 is ten, and they are numbered clockwise as Nos. 1-10, respectively located directly below the ten ball bins 22.

[0041] The metal ball 24 is made of ferromagnetic material, and the number is ten, numbered clockwise as Nos. 1-10, respectively located in the ten ball bins 22, and the colors are different. When the metal ball 24 rolls from the ball bin 22 into the groove track 211, the circular magnet 32 on the magnet disc 3 is just engaged to move to the groove track 211 directly below, and the circular magnet 32 adsorbs the metal ball 24 to move linearly in the groove track 211.

[0042] As shown in Figure 4 The magnet disc 3 includes a disc holder 31 and a circular magnet 32.

[0043] The disc holder 31 is fixedly connected with the upper planetary gear 431, and the outer circle diameter is the same as the division circle of the upper planetary gear 431 and the shaft center is coincident.

[0044] The circular magnet 32 is uniformly arranged at the edge of the disc holder 31 at an interval of 36 degrees, and the number is ten, numbered clockwise as Nos. 1-10. The distance from the center of the circular magnet 32 to the center of the magnet disc 3 is equal to the radius of the division circle of the upper planetary gear 431. The magnet disc 31 rotates with the upper planetary gear 431 and the upper internal gear 412. When one circular magnet 32 moves to the farthest end from the sun shaft 452, it is just located directly below the groove track 211. The other circular magnet 32 symmetrically about the center of the magnet disc 3 has its center coincident with the shaft center of the sun shaft 452.

[0045] As shown in Figure 5 and Figure 6 The planetary gear device 4 is composed of an internal gear device 41, a sun gear 42, a planetary gear 43, an auxiliary wheel 44, a planet carrier 45, and a servo motor 46.

[0046] The internal gear device 41 has a gear ring 411 in the middle. The gear ring 411 is a double-layer circular structure, the outer diameter of the upper layer is equal to the outer diameter of the upper internal gear 412, and the lower layer is provided with a bearing, the inner diameter of the bearing is equal to the outer diameter of the lower internal gear 413. The bottom of the gear ring 411 is provided with a circular hole, and the diameter of the circular hole is greater than the diameter of the bearing of the servo motor 46.

[0047] The upper internal gear 412 is a 204-tooth straight internal gear with a module of 2, and is fixedly connected to the upper layer of the gear ring 411.

[0048] The lower internal gear 413 is a 153-tooth straight internal gear with a module of 2, and is connected to the lower layer of the gear ring 411 through a bearing, and can rotate 360° around the axis of the gear ring 411.

[0049] The sun gear 42 is a 51-tooth spur gear with a module of 2, and is connected to the sun shaft 452 on the planet carrier 45 through a shaft hole, can rotate around the axis of the sun shaft 452, and is in gear engagement with the auxiliary gear 44 and the lower planet gear 432.

[0050] The planet gear 43 is a double-layer spur gear structure, is connected to the planet shaft 453 on the planet carrier 45 through a shaft hole, and can rotate around the axis of the planet shaft 453; the upper planet gear 431 on the upper layer is a 102-tooth spur gear with a module of 2, is in gear engagement with the upper internal gear 412, and the lower planet gear 432 on the lower layer is a 51-tooth spur gear with a module of 2, is in gear engagement with the lower internal gear 413 and the sun gear 42.

[0051] The auxiliary gear 44 is a 51-tooth spur gear with a module of 2, is connected to the auxiliary shaft 454 on the planet carrier 45 through a shaft hole, rotates along the axis of the auxiliary shaft 454, and is in gear engagement with the sun gear 42 and the lower internal gear 413.

[0052] As shown in Figure 7 The planet carrier 45 adopts a three-arm frame structure, the three arms are evenly distributed at an angle of 120°, the frame center is provided with the sun shaft 452, the planet shaft 453 and the auxiliary shaft 454 are respectively arranged on each arm, and the planet shaft 453 is slightly higher than the auxiliary shaft 454; the distances from the axes of the planet shaft 453 and the auxiliary shaft 454 on the three arms to the axis of the sun shaft 452 are equal, the distances are equal to the pitch circle radius of the upper planet gear 431, and a motor shaft hole 455 is reserved at the bottom of the planet carrier 45.

[0053] The servo motor 45 is fixedly connected to the bottom of the gear ring 411, the motor shaft is connected to the motor shaft hole 455 of the planet carrier 45, and drives the sun gear to rotate.

[0054] The control panel 5 supports multiple control mode selection, can drive the servo motor 45 to operate through a control circuit, and can control the on-off of the ten electromagnets 23.

[0055] The specific embodiments of the application are as follows: Case 1: The audience controls the servo motor 45 to rotate forward through the control panel 5, which drives the sun gear 42 to rotate forward, and in turn drives the planetary gear 43 to rotate reversely, and the upper planetary gear 431 moves along the upper internal gear 412 in a counterclockwise meshing gear motion. Since the magnet disc 3 is fixedly connected to the upper planetary gear 431, the upper planetary gear 431 drives the magnet disc 3 to rotate counterclockwise. When the No. 1 circular magnet 32 moves directly below the No. 1 groove track 211, the control circuit triggers the No. 1 electromagnet 23 to be powered off, the No. 1 metal ball 24 rolls into the No. 1 groove track 211 due to its own gravity, and the No. 1 circular magnet 32 attracts the No. 1 metal ball 24 to move linearly along the No. 1 groove track 211. By analogy, until all the metal balls 24 are released in turn, although each metal ball 24 moves independently in its respective groove track 211, the small circle composed of multiple metal balls 24 will form a visual illusion effect of clockwise rolling on the track disc 21. After a certain period of demonstration, when the No. 1 circular magnet 32 drives the No. 1 metal ball 24 to move to the nearest end of the No. 1 ball bin 22, the No. 1 electromagnet 23 is powered on, and its magnetic force is much greater than that of the No. 1 circular magnet 32, so the No. 1 metal ball 24 is attracted into the ball bin 22. The cycle is repeated until all the metal balls 24 return to the ball bin 22, and the demonstration ends.

[0056] Case 2: The audience controls the servo motor 45 to rotate reversely through the control panel 5, which drives the sun gear 42 to rotate reversely, and in turn drives the planetary gear 43 to rotate forward, and the upper planetary gear 431 moves along the upper internal gear 412 in a clockwise meshing gear motion. Since the magnet disc 3 is fixedly connected to the upper planetary gear 431, the upper planetary gear 431 drives the magnet disc 3 to rotate clockwise. When the No. 1 circular magnet 32 moves directly below the No. 1 groove track 211, the control circuit triggers the No. 1 electromagnet 23 to be powered off, the No. 1 metal ball 24 rolls into the No. 1 groove track 211 due to its own gravity, and the No. 1 circular magnet 32 attracts the No. 1 metal ball 24 to move linearly along the No. 1 groove track 211. By analogy, until all the metal balls 24 are released in turn, although each metal ball 24 moves independently in its respective groove track 211, the small circle composed of multiple metal balls 24 will form a visual illusion effect of counterclockwise rolling on the track disc 21. After a certain period of demonstration, when the No. 1 circular magnet 32 drives the No. 1 metal ball 24 to move to the nearest end of the No. 1 ball bin 22, the No. 1 electromagnet 23 is powered on, and its magnetic force is much greater than that of the No. 1 circular magnet 32, so the No. 1 metal ball 24 is attracted into the ball bin 22. The cycle is repeated until all the metal balls 24 return to the ball bin 22, and the demonstration ends.

[0057] Case 3: Combining case 1 and case 2, the audience can control the servo motor 46 to rotate forward or reversely through the control panel 5, and can also arbitrarily select the number and number of metal balls 24 to be released for motion demonstration through the control panel 5.

[0058] The above is only an example of the present application, and does not limit the present application in any form. The present application can change the gear size and number of the planetary gear device according to actual needs to realize other size or structure device demonstration schemes. Although the present application is disclosed as the preferred embodiment, it is not intended to limit the present application. Any slight change or modification of the above-mentioned technical content within the scope of the technical scheme of the present application is equivalent to the equivalent embodiment of the equivalent change, which belongs to the scope of the present application.

Claims

1. A visual illusion demonstration device based on the Tuss double circle, characterized in that: A visual illusion demonstration device based on the Tuss double circle comprises a display stand, a track device, a magnetic disk, a planetary gear device, and a control panel. The display stand is made of metal, with an artificial stone tabletop containing mounting holes. The track device has ten evenly distributed grooves on its track disk surface, with the center as the origin. A metal ball can reciprocate linearly along these grooves. The track device is fixedly connected to the display stand surface with screws. The magnetic disk is fixedly connected to an upper planetary gear and rotates in conjunction with the upper internal gear. The gear ring of the planetary gear device is fixedly connected to the display stand surface with screws and is coaxial with the track device. The control panel is fixedly connected to the display stand tabletop.

2. The optical illusion demonstration device based on the Tuss double circle according to claim 1, characterized in that: The track device includes a track disk, a ball chamber, an electromagnet, and a metal ball; The track disk is made of non-ferromagnetic material and has ten grooved tracks on its surface, numbered 1-10 clockwise. The ten grooved tracks are evenly arranged on the surface of the track disk at 36-degree intervals from the center origin of the track disk. The ball chamber is a hemispherical hollow structure located at one end of the grooved track, slightly higher than the track plate. A gentle slope is set at the front end, which is connected to the grooved track. When the electromagnet is de-energized, the metal ball can roll from the ball chamber into the grooved track by gravity. There are ten ball chambers, numbered 1-10 clockwise, corresponding one-to-one with the grooved track number. The electromagnet is located directly below the ball chamber. When the electromagnet is energized, it becomes magnetic, fixing the metal ball inside the ball chamber. When the electromagnet is de-energized, the magnetism disappears, and the metal ball rolls into the groove track due to its own gravity. When the metal ball moves back to the front of the ball chamber, the electromagnet is energized again. The electromagnet's magnetism is much stronger than that of a circular magnet, so it pulls the metal ball back into the ball chamber and fixes it. There are ten electromagnets, numbered 1-10 clockwise, located directly below the ten ball chambers. The metal balls are made of ferromagnetic material, and there are ten of them, numbered 1 to 10 clockwise. They are located in ten ball chambers and are all different colors. When the metal balls roll from the ball chambers into the grooved track, the circular magnets on the magnetic disk engage and move to the bottom of the grooved track. The circular magnets attract the metal balls and make them move back and forth in a straight line within the grooved track.

3. The optical illusion demonstration device based on the Tuss double circle according to claim 1, characterized in that: The magnet disk includes a disk frame and a circular magnet; The disc holder is fixedly connected to the upper planetary gear, and its outer diameter is the same as the pitch circle of the upper planetary gear and their axes coincide. The circular magnets are evenly spaced at 36-degree intervals along the edge of the disc frame, numbered 1-10 clockwise. The distance from the center of the circular magnet to the center of the magnet disc is equal to the pitch circle radius of the upper planetary gear. The magnet disc rotates with the upper planetary gear meshing with the upper internal gear. When one circular magnet moves to the farthest point from the sun axis, it is exactly below the groove track. The center of another circular magnet, symmetrical about the center of the magnet disc, coincides with the center of the sun axis.

4. The optical illusion demonstration device based on the Tuss double circle according to claim 1, characterized in that: The planetary gear unit comprises an internal gear unit, a sun gear, planet gears, auxiliary gears, a planet carrier, and a servo motor. The internal gear device has a gear ring in the middle, which is a double-layer circular structure. The outer diameter of the upper layer is equal to the outer diameter of the upper internal gear, and the lower layer is equipped with a bearing. The inner diameter of the bearing is equal to the outer diameter of the lower internal gear. The bottom of the gear ring is equipped with a circular hole, the diameter of which is larger than the diameter of the servo motor bearing. The upper internal gear is a 204-tooth spur gear with a module of 2, and it is fixedly connected to the upper layer of the gear ring. The lower internal gear is a 153-tooth spur gear with a module of 2. The lower internal gear is connected to the lower bearing of the gear ring and can rotate 360° around the axis of the gear ring. The sun gear is a 51-tooth spur gear with a module of 2. It is connected to the sun shaft on the planet carrier through a shaft hole and can rotate around the sun shaft axis. It meshes with the auxiliary gear and the lower planet gear respectively. The planetary gears described are double-layer spur gears, connected to the planetary shafts on the planet carrier through shaft holes, and can rotate around the planetary shaft axis. The upper planetary gear is a 102-tooth spur gear with a module of 2, and meshes with the upper internal gear. The lower planetary gear is a 51-tooth spur gear with a module of 2, and meshes with the lower internal gear and the sun gear respectively. The auxiliary wheel is a 51-tooth spur gear with a module of 2. It is connected to the auxiliary shaft on the planetary carrier through a shaft hole and rotates along the axis of the auxiliary shaft to mesh with the sun gear and the lower internal gear respectively. The planetary carrier adopts a three-arm frame structure, with the three arms evenly distributed at 120°. The sun axis is located at the center of the frame, and a planetary axis and an auxiliary axis are respectively mounted on each arm, with the planetary axis slightly higher than the auxiliary axis. The distance from the center of the planetary axis and the auxiliary axis on the three arms to the center of the sun axis is equal, and this distance is equal to the pitch circle radius of the upper planetary gear. The bottom of the planetary carrier has a reserved motor shaft hole. The servo motor is fixedly connected to the bottom of the gear ring, and the motor shaft is connected to the planetary carrier motor shaft hole, driving the sun gear to rotate.

5. The optical illusion demonstration device based on the Tuss double circle according to claim 1, characterized in that: The control panel supports multiple control modes and can drive servo motors through the control circuit, and can control the power on and off of ten electromagnets individually.

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