CN113058272B - Amusement rotary table - Google Patents

Abstract

The invention relates to an amusement turret comprising a pit (18), a turret, a wheelchair, traction means and a power transmission system. The amusement turntable can enable children and teenagers to acquire various physical awareness, and the physical awareness is acquired in an easy and pleasant amusement process, has profound impression and firm memory, and lays a good foundation for learning physics in the future; the amusement turntable can enable a plurality of amusement workers to play at the same time, and has high economic and social benefits; the amusement turntable is convenient and quick for amusement operators to go up and down the turntable (2); the amusement turntable has no potential safety hazard, can prevent amusement workers from separating from the wheelchair, can prevent the wheelchair from separating from the turntable (2), and can also prevent mutual collision between wheelchairs; the amusement turntable can also enable middle-aged and elderly people to experience physical magic, and enjoys pleasure in amusement, thereby improving scientific literacy.

Description

Amusement rotary table

Technical Field

The invention relates to an amusement rotary table, in particular to an amusement rotary table which can enable children and teenagers to obtain a plurality of physical awareness in amusement.

Background

Many middle school students, especially high school students, do not want to learn physical, fear to learn physical. Physical learning has to be performed, emotion is low, and achievement is late.

The physical sense is not difficult to learn, and the root cause is that students lack of physical sense knowledge.

When children and teenagers go to middle school or university to learn physics, there is physical awareness and no physical awareness, emotion, interest, enthusiasm and insight are quite different.

Amusement equipment is manufactured according to physical laws and is one of sources for obtaining physical perception knowledge. Children who do not play a slide, even without knowledge of the slip-down speed, will become greater and greater; when a child playing the slide learns the motion rule of an object on an inclined plane, the child is not only interested, but also easy to understand.

Unfortunately, amusement devices are not very heterogeneous nor popular, many children and teenagers have never experienced, and thus physical awareness is extremely poor.

This has led to more people having a good physical fitness, and there is currently an urgent need to develop more amusement devices that allow more children and teenagers to get more comprehensive physical awareness early.

Disclosure of Invention

The invention aims to provide the recreation turntable which can enable children and teenagers to obtain a plurality of physical awareness in recreation.

In order to solve the technical problems, the technical scheme of the invention is as follows:

An amusement turntable comprises a pit, a turntable, a wheelchair, a traction device and a power transmission system.

The pit is positioned below the horizontal ground, is a cylindrical cavity, has an inner diameter far larger than the height, has a vertical axis, and is provided with a base below the bottom surface of the horizontal pit.

The base is cylindrical, is of a reinforced cement structure, has an axis coincident with the axis of the pit and an outer diameter smaller than the inner diameter of the pit, has an upper surface flush with the bottom surface of the pit, and is internally and fixedly provided with k vertical bolts; the k bolts are uniformly distributed on the same circumference around the axis of the base, the radius of the circumference is r, and the upper ends of the k bolts vertically extend upwards from the upper surface of the base.

The turntable comprises a stand column, a turntable, a sleeve, a main bearing, a bottom plate, an auxiliary bearing, a baffle, a buffer cushion and an intermittent driving device.

The bottom plate is a horizontal thick circular plate, the axis of the bottom plate is coincident with the axis of the base, and k vertical bolt holes are formed in the bottom plate; the k bolt holes are uniformly distributed on the same circumference around the axis of the bottom plate, and the radius of the circumference is r; the k bolt holes on the bottom plate are respectively sleeved on the k bolts on the base, and the k nuts are respectively screwed on the k bolts to fixedly connect the bottom plate on the upper surface of the base.

The upright post is a vertical cylinder, the axis of the upright post is coincident with the axis of the bottom plate, the axial height of the upright post is larger than the depth of the pit, and the lower end surface of the upright post is fixedly connected with the upper surface of the bottom plate at the corresponding position.

The axis of the turntable is coincident with the axis of the upright post, the length of the outer diameter of the turntable is close to the length of the inner diameter of the pit, but is smaller than the length of the inner diameter of the pit, a turntable hole is formed in the center of the turntable, n pairs of turntable grooves are formed in the upper surface of the turntable, and n is an even number; the axis of the disk hole is coincident with the axis of the turntable, and the inner diameter of the disk hole is larger than the outer diameter of the upright post; the two disc grooves of each pair of disc grooves are straight grooves which are parallel to each other, wherein the line is in the radial direction of the turntable; the n pairs of disc slots are evenly distributed over the turntable so that any pair of disc slots must have another pair of disc slots symmetrical thereto.

The axial height of the sleeve is smaller than the depth of the pit but larger than the thickness of the turntable, the inner diameter of the sleeve is larger than the outer diameter of the upright, the outer diameter of the sleeve is larger than the inner diameter of a disk hole on the turntable, the upper end of the sleeve is forcefully inserted into the disk hole of the turntable and fixedly connected with the turntable, and the upper end face of the sleeve is flush with the upper surface of the turntable.

The outer circumferential surfaces of the outer rings of the two main bearings are fixedly connected with the inner circumferential surfaces of the sleeves at corresponding positions respectively, the inner circumferential surfaces of the inner rings of the two main bearings are fixedly connected with the outer circumferential surfaces of the upright posts at corresponding positions respectively, and the axes of the two main bearings are coincident with the axes of the upright posts; one main bearing is positioned at the upper port of the sleeve, and the other main bearing is positioned at the lower port of the sleeve; the upper surface of the turntable is flush with the ground of the pit mouth of the pit.

The two bearings are positioned above the sleeve, and the inner circumferential surfaces of the inner rings of the two bearings are fixedly connected with the outer circumferential surfaces of the upright posts at corresponding positions respectively; one of the two auxiliary bearings is close to the sleeve, and the other auxiliary bearing is positioned at the upper end of the upright post.

The baffle is rectangular in outline, the inner surface and the outer surface of the baffle are arc surfaces, and the axes of the inner surface and the outer surface of the baffle are coincident with the axis of the turntable; n baffles which are uniformly distributed and vertically arranged on the disc surface at the edge of the turntable, are respectively opposite to n pairs of disc grooves on the adjacent turntable along the radial direction, and the lower end surfaces of the n baffles are respectively fixedly connected with the upper surface of the turntable at corresponding positions.

The shape of the outline of the buffer pad is the same as that of the outline of the baffle plate, the area of the buffer pad is equal to that of the outline of the baffle plate, the inner surface of the buffer pad is a vertical plane, the outer surface of the buffer pad is an arc surface, and the axis of the outer surface of the buffer pad is coincident with the axis of the turntable; the outer surfaces of the n buffer pads are fixedly connected with the inner surfaces of the n baffle plates respectively.

The intermittent driving device comprises a ratchet wheel, a pawl shaft, a spring plate and an intermittent bearing.

The ratchet wheel is in a circular ring shape, the axis of the ratchet wheel is coincident with the axis of the sleeve, and the inner edge of the lower end of the ratchet wheel is provided with ratchet teeth extending inwards; the tips of the ratchet teeth are on the same circumference, the axis of the circumference coincides with the axis of the ratchet, and the diameter of the circumference is smaller than the inner diameter of the ratchet but larger than the outer diameter of the sleeve.

The intermittent bearing, the outer circumferential surface of its outer ring is fixedly connected with the inner circumferential surface of the ratchet wheel, the inner circumferential surface of its inner ring is fixedly connected with the outer circumferential surface of the lower end of the sleeve; the tips of the ratchet teeth on the ratchet wheel are close to the lower end surface of the sleeve.

The upper ends of the two detent shafts are respectively and vertically fixedly connected to the cylinder wall of the lower end face of the sleeve, and the connecting line of the two detent shafts is orthogonal with the axis of the sleeve.

And the two pawls are respectively sleeved on the two pawl shafts, can rotate on the horizontal plane around the corresponding pawl shafts and cannot move along the axial direction.

And one end of each elastic sheet is fixedly connected to the cylinder wall of the lower end face of the sleeve beside the two pawls, and the other end of each elastic sheet is respectively pressed on the two pawls, so that the two pawls are respectively inserted into tooth grooves of ratchet teeth on the ratchet wheel at corresponding positions.

Looking up the ratchet wheel, when the ratchet wheel rotates in the anticlockwise direction, ratchet teeth on the ratchet wheel push the two pawls so as to drive the sleeve to synchronously rotate in the anticlockwise direction; when the ratchet is stationary, the pawls do not affect rotation of the sleeve in a counter-clockwise direction.

The wheelchair comprises a flat car and a chair.

The flat car consists of a flat plate, step wheels and a wheel shaft.

The flat plate is a horizontal rectangular plate, and the longitudinal length of the flat plate is larger than the transverse width.

The two wheel shafts are respectively and transversely fixedly connected on the flat plate from front to back, and both ends of the two wheel shafts extend outwards from both sides of the flat plate.

The step wheel is formed by combining a side wheel and a rail wheel into a whole in a coaxial way, the outer diameter of the side wheel is larger than that of the rail wheel, and the side wheel is positioned at the outer side of the rail wheel; four step wheels are arranged on the flat plate, two of the four step wheels are respectively sleeved on two extending ends of a front wheel shaft of the flat plate, the other two step wheels are respectively sleeved on two extending ends of a rear wheel shaft of the flat plate, and the four step wheels can freely rotate on a vertical plane around respective axes and cannot axially move.

n flatbed cars are respectively placed on n pairs of disc grooves of the turntable; among the four step wheels on each flat car, the side wheels on the two step wheels on the same side are inserted into the corresponding side of the corresponding pair of disc grooves, the side wheels on the other two step wheels on the other side are inserted into the disc grooves on the other side of the pair of disc grooves, the track wheels on the four step wheels are movably contacted with the upper surface of the turntable at the corresponding positions, and when the track wheels on the four step wheels roll along the upper surface of the turntable 2 in the same direction, the flat car 9 can only move radially relative to the turntable 2 and cannot move tangentially.

The chair is provided with a safety belt, one side of the safety belt is hung with a ball frame, and a plurality of soft balls are placed in the ball frame.

The n chairs are respectively and fixedly connected to the flat plates of the n flat cars, and after the n amusement parks are respectively seated on the n chairs, the n amusement parks face the upright post.

The traction device comprises a rope and a spring.

And one end of each of the n ropes is fixedly connected with the outer circumferential surface of the outer ring of the auxiliary bearing positioned at the upper end of the upright post at the corresponding position, and the other end of each of the n ropes extends to the n chairs in the radial direction and is placed in the corresponding ball frame for standby.

And one ends of the n springs are fixedly connected with the outer circumferential surface of the auxiliary bearing outer ring of the sleeve at corresponding positions respectively, and the other ends of the n springs extend to the n flat cars respectively in the radial direction and are hooked with the front ends of the upper flat plates of the n flat cars respectively.

The power transmission system comprises an electric motor, an output wheel and a belt.

The output wheel is fixedly sleeved on the output shaft of the motor.

The belt is sleeved on the output wheel and the ratchet wheel of the intermittent driving device.

Looking up at the intermittent driving device, when the motor works, the ratchet wheel is driven to rotate in the anticlockwise direction through the belt transmission, the ratchet wheel drives the sleeve to synchronously rotate in the anticlockwise direction through the pushing of ratchet teeth on the ratchet wheel to two pawls on the sleeve, and the sleeve drives the turntable to synchronously rotate in the anticlockwise direction; when the motor stops working, the two pawls do not prevent the sleeve from rotating anticlockwise, so that the turntable is connected with the sleeve to rotate anticlockwise continuously due to inertia; the turntable has larger rotational inertia, so the turntable has larger rotational kinetic energy and small friction resistance, and can rotate for a longer time according to the law of conservation of energy, so that n amusement players respectively sitting on n chairs can have enough time to play amusement.

After n amusement operators sit on n chairs respectively, the safety belts are tied firmly, and then amusement is started; the following physical awareness is available in amusement:

firstly, a spring is separated from a corresponding flat car, a player on the flat car tightens a corresponding rope by hand to keep the position of the flat car relative to a turntable, then a motor drives the turntable to slowly accelerate to rotate, and the player feels that the force of a rope handle is gradually increased; when the rotating speed of the turntable is constant, the player is connected to the flat car to slowly keep away from the upright post, and the force of the rope handle is felt to be larger.

The player obtains the perceptual knowledge of Newton's third law through in-person feeling, obtains the perceptual knowledge of centripetal force, obtains the perceptual knowledge that the centripetal force increases with the increase of angular velocity under the condition that the circular motion radius is unchanged and the mass is unchanged, and obtains the perceptual knowledge that the centripetal force increases with the increase of the circular motion radius under the condition that the angular velocity is unchanged and the mass is unchanged.

Secondly, the rope is idle, the springs are hooked with the corresponding flat car, and the motor drives the turntable to slowly accelerate to rotate; only the flatbed is seen to gradually leave the upright post, and the spring gradually stretches.

The player obtains the sense that the spring can provide centripetal force through the feeling of being in person, and obtains the sense that the elasticity of the spring increases along with the increase of the elongation of the spring.

Thirdly, the ropes are idle, the springs are hooked with the corresponding flat car, after the motor drives the turntable to rotate, the back of a player on the flat car is tightly pressed on the back plate of the corresponding chair, and the upper body is difficult to tilt forwards; the higher the rotating speed of the turntable is, the harder the upper body is tilted forwards; if the user wants to lean forward, the user needs to pull the chair backwards by hand, which is different from the condition of sitting on a stool in a home.

Through the in-person feeling, the amusement player obtains the perception that the circular motion of any object (such as an upper body) needs centripetal force, obtains the perception that a plurality of methods provide the centripetal force, and obtains the perception of Newton's third law.

Fourthly, n ropes are idle, n springs are respectively hooked with n flat cars, and the motor drives the turntable to rotate at a constant rotation speed; when the n flat cars are kept relatively static relative to the turntable, some amusement players are farthest from the upright post, and some amusement players are closest to the upright post; it was observed that the player furthest from the post was either a fat or tall child and the player closest to the post was either a lean or short child.

The amusement player obtains the perception that the larger the mass of the object, the larger the centripetal force is required under the condition that the angular velocity is the same.

Fifthly, the rope is idle, the springs are hooked with the corresponding flat car, and the motor drives the turntable to rotate at a constant rotating speed; the upper player of the flat car throws the soft ball vertically, but the soft ball thrown upwards does not fall back into the hand, but flies away to the left of the throwing point, which is different from the situation of throwing the soft ball on the ground when standing.

The player obtains the sense of inertia through the feeling of in-person, and obtains the sense of the tangential direction of the speed direction of the circular motion object.

Sixthly, the rope is idle, the springs are hooked with the corresponding flat car, and the motor drives the turntable to rotate at a constant rotating speed; the player on the flat car horizontally throws the soft ball at the same hand-out speed to the left side and the right side respectively, and the player finds that the soft ball thrown to the left side flies far and the soft ball thrown to the right side flies near.

The player obtains the perception of the speed of the division and the combination through the feeling of the person in person, and obtains the perception of the speed combination on the same straight line.

Seventhly, two symmetrical ropes are idle, two symmetrical springs are hooked with corresponding flat cars respectively, and a motor drives a turntable to rotate at a constant rotating speed; two symmetrical amusement players mutually transmit soft balls, the soft balls cannot be transmitted to the hands of the opposite party according to the ball transmission mode on the ground, and the rough method is finally obtained through continuous exploration.

The player obtains the perception of combining two speeds at an angle through feeling in person.

Eight, n springs are hooked with n flatbed cars respectively, the motor stops working, and when the turntable rotates, n amusement operators pull the ropes respectively, so that the n flatbed cars approach to the upright posts, unexpected situations occur, and the rotating speed of the turntable is accelerated.

The amusement player obtains the inductive knowledge of the moment of inertia through the in-person feeling, and obtains the inductive knowledge of conservation of the angular momentum of the system under the condition that the external force moment of the system is zero or negligible.

By adopting the structure, as the amusement turntable can provide various amusement contents for amusement operators, the amusement operators can acquire various physical perception insights, and the problems are great while the problems are left after the amusement operators can not understand the amusement, the problems are converted into the power for learning physics, and the problems are solved and the problems are converted into interests.

With such a structure, since the perceptual knowledge is obtained during the easy and pleasant amusement, the perceptual knowledge has a profound impression and a firm memory.

After the structure is adopted, the traction device of the flat car can be a rope or a spring, so that the amusement turntable can enable amusement operators to obtain more physical perception.

After the structure is adopted, due to the arrangement of the intermittent driving device and the arrangement of the two main bearings, the two auxiliary bearings and the intermittent bearing, the friction resistance is greatly reduced, so that after the motor stops working, the turntable can rotate for a long time enough, and a player can obtain the perceptual knowledge of rotational inertia and conservation of angular momentum of the system.

After the structure is adopted, n amusement workers can play simultaneously due to the amusement turntable, so that the economic benefit is improved, and the social benefit is also improved.

After adopting such structure, because the upper surface of carousel and the pithead ground of pit flush, the person of travelling goes up and down carousel very convenient and fast.

After adopting such structure, owing to the setting of safety belt, owing to the setting of baffle and cushion, owing to the setting of step wheel and dish groove, can prevent that the person of travelling from breaking away from the wheelchair, can prevent again that the wheelchair from breaking away from the carousel, can also prevent the mutual collision between the wheelchair, eliminated the potential safety hazard of recreation revolving stage.

By adopting the structure, while the invention initially aims at enabling children and teenagers to acquire physical sense knowledge in easy and happy amusement, the invention can enable middle-aged and elderly people to experience physical magic, thereby acquiring fun in amusement and improving scientific literacy.

Drawings

The following describes the embodiments of the present invention in further detail with reference to the drawings.

Fig. 1 is a schematic vertical section of the amusement ride turntable with the vertical axis of the upright positioned on the section.

Fig. 2 is a schematic vertical section of a turntable, on which section the axis of an axle on a pallet truck is located.

Fig. 3 is a schematic top view of the amusement ride turntable, but the chair, ropes and auxiliary bearings at the upper ends of the uprights are not shown.

Fig. 4 is a schematic bottom view of the intermittent drive device, but with a substantial portion of the intermittent bearing obscured by the ratchet teeth of the ratchet wheel, and the post and main bearing not shown.

Detailed Description

As shown in fig. 1 to 4, an amusement turret includes a pit 18, a turret, a wheelchair, a traction device, and a power transmission system.

As shown in fig. 1, the pit 18 is located below the horizontal ground, is a cylindrical cavity, has an inner diameter much larger than the height, has an axis vertical, and has a base 7 below the bottom surface of the horizontal pit.

As shown in fig. 1, the base 7 is a cylindrical shape, is a reinforced cement structure, has an axis coincident with the axis of the pit 18, has an outer diameter smaller than the inner diameter of the pit 18, has an upper surface flush with the bottom surface of the pit 18, and has k vertical bolts 8 fixedly installed therein. The k bolts 8 are uniformly distributed on the same circumference around the axis of the base 7, and the radius of the circumference is r, and the upper ends thereof all protrude vertically upward from the upper surface of the base 7.

As shown in fig. 1 to 4, the turntable includes a column 1, a turntable 2, a sleeve 3, a main bearing 4, a base plate 6, a sub bearing 14, a baffle 19, a cushion pad 20, and an intermittent drive unit.

As shown in fig. 1, the bottom plate 6 is a horizontal thick circular plate, the axis of which coincides with the axis of the base 7, and k vertical bolt holes 6a are formed therein. The k bolt holes 6a are uniformly distributed on the same circumference around the axis of the bottom plate 6, and the radius of the circumference is r. The k bolt holes 6a on the bottom plate 6 are respectively sleeved on the k bolts 8 on the base 7, and the k nuts are respectively screwed on the k bolts 8 to fixedly connect the bottom plate 6 on the upper surface of the base 7.

As shown in fig. 1, the upright 1 is a vertical cylinder, the axis of which coincides with the axis of the bottom plate 6, the axial height of which is greater than the depth of the pit 18, and the lower end surface of which is fixedly connected with the upper surface of the bottom plate 6 at a corresponding position.

As shown in fig. 1 and 3, the axis of the turntable 2 coincides with the axis of the upright 1, the length of the outer diameter thereof is close to the length of the inner diameter of the pit 18 but is smaller than the length of the inner diameter of the pit 18, a disk hole 2a is formed in the center of the turntable, and n pairs of disk grooves 2b are formed in the upper surface of the turntable, wherein n is an even number. The disk hole 2a has an axis coincident with the axis of the turntable 2 and an inner diameter larger than the outer diameter of the column 1. The two disc grooves 2b of each pair of disc grooves 2b, which are straight grooves, are parallel to each other with their line in the radial direction of the turntable 2. The n pairs of disc grooves 2b are uniformly distributed on the turntable 2 so that any pair of disc grooves 2b must have another pair of disc grooves 2b symmetrical thereto.

As shown in fig. 1, the axis of the sleeve 3 coincides with the axis of the upright 1, the axial height of the sleeve is smaller than the depth of the pit 18 but larger than the thickness of the turntable 2, the inner diameter of the sleeve is larger than the outer diameter of the upright 1, the outer diameter of the sleeve is larger than the inner diameter of the upper disc hole 2a of the turntable 2, the upper end of the sleeve is forcefully inserted into the disc hole 2a of the turntable 2 and fixedly connected with the turntable 2, and the upper end face of the sleeve is flush with the upper surface of the turntable 2.

As shown in fig. 1, the two main bearings 4 have outer circumferential surfaces of outer rings fixedly connected to inner circumferential surfaces of the respective sleeves 3, inner circumferential surfaces of inner rings fixedly connected to outer circumferential surfaces of the respective columns 1, and axes thereof are coincident with the axes of the columns 1. Of these two main bearings 4, one main bearing 4 is located at the upper port of the sleeve 3 and the other main bearing 4 is located at the lower port of the sleeve 3. The upper surface of the turntable 2 is flush with the floor of the mouth of the pit 18.

As shown in fig. 1, two pairs of bearings 14, each of which is located above the sleeve 3, have inner circumferential surfaces of inner rings thereof fixedly connected to outer circumferential surfaces of the columns 1 at corresponding positions, respectively. Of these two sub-bearings 14, one sub-bearing 14 is close to the sleeve 3 and the other sub-bearing 14 is located at the upper end of the upright 1.

As shown in fig. 1 and 3, the baffle 19 has a rectangular outline, the inner and outer surfaces thereof are arc surfaces, and the axes of the inner and outer surfaces thereof coincide with the axis of the turntable 2. n baffles 19 which are uniformly distributed and vertically arranged on the disc surface at the edge of the turntable 2 are respectively opposite to n pairs of disc grooves 2b on the adjacent turntable 2 along the radial direction, and the lower end surfaces of the n baffles are respectively fixedly connected with the upper surface of the turntable 2 at corresponding positions.

As shown in fig. 1 and 3, the cushion pad 20 has a contour having the same shape and the same area as the contour of the baffle plate 19, an inner surface having a vertical plane, an outer surface having an arc surface, and an axis of the outer surface being coincident with the axis of the turntable 2. The outer surfaces of the n cushioning pads 20 are fixedly connected to the inner surfaces of the n baffle plates 19, respectively.

As shown in fig. 1 and 4, the intermittent drive device includes a ratchet wheel 5, a pawl 22, a pawl shaft 15, a spring piece 23, and an intermittent bearing 24.

As shown in fig. 1 and 4, the ratchet wheel 5 is in a circular ring shape, the axis of the ratchet wheel is coincident with the axis of the sleeve 3, and the inner edge of the lower end of the ratchet wheel is provided with inwardly extending ratchet teeth 5a. The tips of the ratchet teeth 5a are on the same circumference, the axis of which coincides with the axis of the ratchet wheel 5, the diameter of which is smaller than the inner diameter of the ratchet wheel 5 but larger than the outer diameter of the sleeve 3.

As shown in fig. 1, the intermittent bearing 24 has an outer circumferential surface of an outer ring fixedly coupled to an inner circumferential surface of the ratchet 5 and an inner circumferential surface of an inner ring fixedly coupled to an outer circumferential surface of a lower end of the sleeve 3. The tips of the ratchet teeth 5a on the ratchet wheel 5 are close to the lower end face of the sleeve 3.

As shown in fig. 1 and 4, the upper ends of the two detent shafts 15 are respectively and vertically fixedly connected to the wall of the lower end face of the sleeve 3, and the connecting line of the two detent shafts 15 is orthogonal to the axis of the sleeve 3.

As shown in fig. 1 and 4, two pawls 22 are respectively sleeved on the two pawl shafts 15, and each pawl is rotatable on a horizontal plane about the corresponding pawl shaft 15 but cannot move in the axial direction.

As shown in fig. 4, two elastic pieces 23 have one ends respectively fixedly connected to the walls of the lower end surfaces of the sleeve 3 beside the two pawls 22, and the other ends respectively pressed against the two pawls 22, so that the two pawls 22 are respectively inserted into the tooth grooves of the ratchet teeth 5a on the ratchet wheel 5 at corresponding positions.

As shown in fig. 4, looking up the ratchet wheel 5, when the ratchet wheel 5 rotates in the counterclockwise direction, the ratchet teeth 5a on the ratchet wheel 5 push the two pawls 22, thereby driving the sleeve 3 to rotate synchronously in the counterclockwise direction. When the ratchet wheel 5 is stationary, the two pawls 22 do not affect the rotation of the sleeve 3 in the counterclockwise direction.

As shown in fig. 1, the wheelchair comprises a flatbed 9 and a chair 12.

As shown in fig. 1, 2 and 3, the flatbed 9 is composed of a flat plate 10, a stepped wheel 11 and an axle 21.

As shown in fig. 1 and 3, the flat plate 10 is a horizontal rectangular plate having a longitudinal length greater than a lateral width.

As shown in fig. 1 and 2, two wheel shafts 21 are fixedly connected to the flat plate 10 in a front-to-back direction, and both ends of the two wheel shafts extend outwards from both sides of the flat plate 10.

As shown in fig. 1 and 2, the step wheel 11 is formed by combining a side wheel 11a and a rail wheel 11b into a coaxial whole, the outer diameter of the side wheel 11a is larger than that of the rail wheel 11b, and the side wheel 11a is positioned outside the rail wheel 11 b. Four step wheels 11 are mounted on the flat plate 10, two step wheels 11 are respectively sleeved on two extending ends of a front wheel shaft 21 of the flat plate 10, the other two step wheels 11 are respectively sleeved on two extending ends of a rear wheel shaft 21 of the flat plate 10, and the four step wheels 11 can freely rotate on a vertical plane around respective axes but cannot axially move.

As shown in fig. 3, n flatcars 9 are placed on n pairs of disc grooves 1b of the turntable 2, respectively; of the four step wheels 11 on each flat car 9, the side wheels 11a on the two step wheels 11 on the same side are inserted into the corresponding side of the corresponding pair of disc grooves 1b, the side wheels 11a on the other two step wheels 11 on the other side are inserted into the other side of the pair of disc grooves 1b, the rail wheels 11b on the four step wheels 11 are movably contacted with the upper surface of the turntable 2 at the corresponding positions, and when the rail wheels 11b on the four step wheels 11 roll along the upper surface of the turntable 2 in the same direction, the flat car 9 can only move radially relative to the turntable 2 and cannot move tangentially.

As shown in fig. 1, the chair 12 is provided with a seat belt 13, and a ball frame in which a plurality of soft balls are placed is hung on one side thereof.

As shown in fig. 1, n chairs 12 are fixedly connected to the flat plates 10 of the n flat cars 9, respectively, and when n amusement parks on the n chairs 12, respectively, the n amusement parks face the upright 1.

As shown in fig. 1 and 3, the traction device comprises a rope 16 and a spring 17.

As shown in fig. 1, n ropes have one ends fixedly connected to the outer circumferential surface of the outer ring of the sub-bearing 14 at the upper end of the upright 1 at the corresponding positions, respectively, and the other ends extending radially toward the n chairs 12, respectively, and are placed in the corresponding ball frames for standby.

As shown in fig. 1 and 3, n springs 17 have one ends fixedly connected to the outer circumferential surface of the outer ring of the sub-bearing 14 near the sleeve 3 at corresponding positions, respectively, and the other ends extending radially toward the n flat cars 9, respectively, and are movably hooked with the front ends of the upper plates 10 of the n flat cars 9, respectively.

The power transmission system comprises an electric motor, an output wheel and a belt.

The output wheel is fixedly sleeved on the output shaft of the motor.

The belt is sleeved on the output wheel and the ratchet wheel 5 of the intermittent drive device.

As shown in fig. 1 and 4, when the motor works, the ratchet wheel 5 is driven to rotate in a counterclockwise direction through the belt transmission, and the ratchet wheel 5 pushes the two pawls 22 on the sleeve 3 through the ratchet teeth 5a on the ratchet wheel 5, so that the sleeve 3 synchronously rotates in the counterclockwise direction, and the sleeve 3 drives the turntable 2 to synchronously rotate in the counterclockwise direction. When the motor is deactivated, the pawls 22 do not hinder the counterclockwise rotation of the sleeve 3, so that the turntable 2 is connected to continue the counterclockwise rotation of the sleeve 3 by inertia. The turntable 2 has a large moment of inertia, so that the turntable 2 has a large moment of rotation and a small frictional resistance, and the turntable 2 can rotate for a long time according to the law of conservation of energy, so that n players sitting on n chairs 12 respectively have enough time to play.

After n players sit on n chairs 12, respectively, the safety belt 13 is fastened firmly, and then the amusement starts. The following physical awareness is available in amusement:

first, as shown in fig. 1, the springs 17 are separated from the corresponding flat car 9, the player on the flat car 9 tightens the corresponding ropes 16 by hand, the position of the flat car 9 relative to the turntable 2 is unchanged, then the turntable 2 is driven by the motor to slowly accelerate to rotate, and the player feels that the force of the handles of the ropes 16 is gradually increased. When the rotation speed of the turntable 2 is constant, the player connects the flatbed 9 slowly away from the upright 1, and feels that the force of the rope 16 pulling the handle is larger.

The player obtains the perceptual knowledge of Newton's third law through in-person feeling, obtains the perceptual knowledge of centripetal force, obtains the perceptual knowledge that the centripetal force increases with the increase of angular velocity under the condition that the circular motion radius is unchanged and the mass is unchanged, and obtains the perceptual knowledge that the centripetal force increases with the increase of the circular motion radius under the condition that the angular velocity is unchanged and the mass is unchanged.

Secondly, as shown in fig. 1 and 3, the ropes 16 are idle, the springs 17 are hooked with the corresponding flat car 9, and the motor drives the turntable 2 to slowly accelerate to rotate. Only the pallet 9 is seen to gradually leave the column 1, the springs 17 gradually extending.

The player obtains the sense that the spring 17 can also provide the centripetal force by feeling in person, and obtains the sense that the elastic force of the spring 17 increases with the increase of the elongation thereof.

Thirdly, as shown in fig. 1, the ropes 16 are idle, the springs 17 are hooked with the corresponding flat car 9, and after the motor drives the turntable 2 to rotate, the back of a player on the flat car 9 is tightly pressed on the back plate of the corresponding chair 12, so that the upper body is difficult to tilt forwards. The higher the rotation speed of the turntable 2 is, the harder the upper body is tilted forwards; if forward tilting is desired, hand force is required to pull the chair 12 backward, unlike in the case of sitting on a stool in a home.

Through the in-person feeling, the amusement player obtains the perception that the circular motion of any object (such as an upper body) needs centripetal force, obtains the perception that a plurality of methods provide the centripetal force, and obtains the perception of Newton's third law.

Fourth, as shown in fig. 1, n ropes 16 are idle, n springs 17 are hooked with n flat cars 9 respectively, and the motor drives the turntable 2 to rotate at a constant rotation speed. When the n flat cars 9 are kept relatively stationary with respect to the turntable 2, some amusement park is farthest from the upright 1, and some amusement park is closest to the upright 1. It was observed that the player furthest from the upright 1 was a fat or tall child and the player closest to the upright 1 was a lean or short child.

The amusement player obtains the perception that the larger the mass of the object, the larger the centripetal force is required under the condition that the angular velocity is the same.

Fifthly, as shown in fig. 1, the ropes 16 are idle, the springs 17 are hooked with the corresponding flat car 9, and the motor drives the turntable 2 to rotate at a constant rotation speed. The player on the flat car 9 throws the soft ball vertically, but the thrown soft ball does not fall back into the hand, but flies away to the left of the throwing point, unlike the case of throwing the soft ball standing on the ground.

The player obtains the sense of inertia through the feeling of in-person, and obtains the sense of the tangential direction of the speed direction of the circular motion object.

Sixth, as shown in fig. 1 and 3, the ropes 16 are idle, the springs 17 are hooked with the corresponding flat car 9, and the motor drives the turntable 2 to rotate at a constant rotation speed. The player on the flatbed 9 horizontally throws the soft ball at the same hand-out speed to the left and right sides, respectively, and the player finds that the soft ball thrown to the left flies far and the soft ball thrown to the right flies near.

The player obtains the perception of the speed of the division and the combination through the feeling of the person in person, and obtains the perception of the speed combination on the same straight line.

Seventh, as shown in fig. 1 and 3, two symmetrical ropes 16 are idle, two symmetrical springs 17 are hooked with corresponding flat cars 9, and the motor drives the turntable 2 to rotate at a constant rotation speed. Two symmetrical amusement players mutually transmit soft balls, the soft balls cannot be transmitted to the hands of the opposite party according to the ball transmission mode on the ground, and the rough method is finally obtained through continuous exploration.

The player obtains the perception of combining two speeds at an angle through feeling in person.

As shown in fig. 1 and 3, n springs 17 are hooked with n flat cars 9 respectively, the motor stops working, and when the turntable 2 is still rotating, n amusement operators pull the ropes 16 respectively, so that the n flat cars 9 approach the upright posts 1, and unexpected situations occur, and the rotating speed of the turntable 2 is accelerated.

The amusement player obtains the inductive knowledge of the moment of inertia through the in-person feeling, and obtains the inductive knowledge of conservation of the angular momentum of the system under the condition that the external force moment of the system is zero or negligible.

The embodiments of the present invention are described in detail above with reference to the drawings. The present invention is not limited to the above-described embodiments, and various changes may be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Various changes may be made without departing from the spirit of the invention and still fall within the scope of the invention.

Claims (2)

1. An amusement turntable, characterized in that:

the amusement turntable comprises a pit (18), a turntable, a wheelchair, a traction device and a power transmission system;

the pit (18) is positioned below the horizontal ground, is a cylindrical cavity, has an inner diameter far larger than the height, has a vertical axis, and is provided with a base (7) below the bottom surface of the horizontal pit;

the base (7) is cylindrical, is of a reinforced cement structure, has an axis coincident with the axis of the pit (18), has an outer diameter smaller than the inner diameter of the pit (18), has an upper surface flush with the pit bottom surface of the pit (18), and is internally and fixedly provided with k vertical bolts (8); the k bolts (8) are uniformly distributed on the same circumference around the axis of the base (7), the radius of the circumference is r, and the upper ends of the k bolts vertically extend upwards from the upper surface of the base (7);

the turntable comprises an upright post (1), a turntable (2), a sleeve (3), a main bearing (4), a bottom plate (6), an auxiliary bearing (14), a baffle (19), a buffer pad (20) and an intermittent driving device;

the bottom plate (6) is a horizontal thick circular plate, the axis of the bottom plate is coincident with the axis of the base (7), and k vertical bolt holes (6 a) are formed in the bottom plate; the k bolt holes (6 a) are uniformly distributed on the same circumference around the axis of the bottom plate (6), and the radius of the circumference is r; the k bolt holes (6 a) on the bottom plate (6) are respectively sleeved on the k bolts (8) on the base (7), and the k nuts are respectively screwed on the k bolts (8) to fixedly connect the bottom plate (6) on the upper surface of the base (7); a step of

The upright post (1) is a vertical cylinder, the axis of the upright post is coincident with the axis of the bottom plate (6), the axial height of the upright post is greater than the depth of the pit (18), and the lower end surface of the upright post is fixedly connected with the upper surface of the bottom plate (6) at the corresponding position;

the axis of the turntable (2) coincides with the axis of the upright post (1), the length of the outer diameter of the turntable is close to the length of the inner diameter of the pit (18) but is smaller than the length of the inner diameter of the pit (18), a disk hole (2 a) is formed in the center of the turntable, n pairs of disk grooves (2 b) are formed in the upper surface of the turntable, and n is an even number; the axis of the disc hole (2 a) coincides with the axis of the rotary disc (2), and the inner diameter of the disc hole is larger than the outer diameter of the upright post (1); two disc grooves (2 b) of each pair of disc grooves (2 b), which are straight grooves, are parallel to each other with a line in the radial direction of the turntable (2); the n pairs of disc grooves (2 b) are uniformly distributed on the turntable (2), so that any pair of disc grooves (2 b) is required to have the other pair of disc grooves (2 b) symmetrical to the other pair of disc grooves;

the axial height of the sleeve (3) is smaller than the depth of the pit (18) but larger than the thickness of the turntable (2), the inner diameter of the sleeve is larger than the outer diameter of the upright (1), the outer diameter of the sleeve is larger than the inner diameter of a turntable hole (2 a) on the turntable (2), the upper end of the sleeve is forcefully inserted into the turntable hole (2 a) of the turntable (2) and fixedly connected with the turntable (2), and the upper end face of the sleeve is flush with the upper surface of the turntable (2);

The outer circumferential surfaces of the outer rings of the two main bearings (4) are fixedly connected with the inner circumferential surfaces of the sleeves (3) at corresponding positions respectively, the inner circumferential surfaces of the inner rings of the two main bearings are fixedly connected with the outer circumferential surfaces of the upright posts (1) at corresponding movable turntable positions respectively, and the axes of the two main bearings are coincident with the axes of the upright posts (1); of the two main bearings (4), one main bearing (4) is positioned at the upper port of the sleeve (3), and the other main bearing (4) is positioned at the lower port of the sleeve (3); the upper surface of the turntable (2) is flush with the ground of the pit mouth of the pit (18);

two pairs of bearings (14) which are positioned above the sleeve (3) and the inner circumferential surfaces of the inner rings of which are fixedly connected with the outer circumferential surfaces of the upright posts (1) at corresponding positions respectively; of the two auxiliary bearings (14), one auxiliary bearing (14) is close to the sleeve (3), and the other auxiliary bearing (14) is positioned at the upper end of the upright (1);

the outline of the baffle (19) is rectangular, the inner surface and the outer surface of the baffle are arc surfaces, and the axes of the inner surface and the outer surface of the baffle are coincident with the axis of the turntable (2); n baffles (19) which are uniformly distributed and vertically arranged on the disc surface at the edge of the turntable (2) and are respectively opposite to n pairs of disc grooves (2 b) on the adjacent turntable (2) along the radial direction, and the lower end surfaces of the n baffles are respectively fixedly connected with the upper surfaces of the turntable (2) at corresponding positions;

The shape of the outline of the cushion pad (20) is the same as that of the outline of the baffle plate (19) and the areas are the same, the inner surface of the cushion pad is a vertical plane, the outer surface of the cushion pad is an arc surface, and the axis of the outer surface of the cushion pad is coincident with the axis of the turntable (2); the outer surfaces of the n cushion pads (20) are fixedly connected with the inner surfaces of the n baffle plates (19) respectively;

the intermittent driving device comprises a ratchet wheel (5), a pawl (22), a pawl shaft (15), a spring piece (23) and an intermittent bearing (24);

the ratchet wheel (5) is in a circular ring shape, the axis of the ratchet wheel is coincident with the axis of the sleeve (3), and the inner edge of the lower end of the ratchet wheel is provided with ratchet wheel teeth (5 a) which extend inwards; the tips of the ratchet teeth (5 a) are on the same circumference, the axis of which coincides with the axis of the ratchet (5), the diameter of which is smaller than the inner diameter of the ratchet (5) but greater than the outer diameter of the sleeve (3);

the intermittent bearing (24) has an outer circumferential surface of an outer ring fixedly connected with an inner circumferential surface of the ratchet wheel (5) and an inner circumferential surface of an inner ring fixedly connected with an outer circumferential surface of a lower end of the sleeve (3); the tooth tips of ratchet teeth (5 a) on the ratchet wheel (5) are close to the lower end surface of the sleeve (3);

the upper ends of the two detent shafts (15) are respectively and vertically fixedly connected to the cylinder wall of the lower end face of the sleeve (3), and the connecting line of the two detent shafts (15) is orthogonal with the axis of the sleeve (3);

Two pawls (22) which are respectively fitted over the two pawl shafts (15) and which are each rotatable on a horizontal plane about the respective pawl shaft (15) but are each not movable in the axial direction;

two elastic sheets (23), one ends of which are respectively and fixedly connected to the cylinder wall of the lower end face of the sleeve (3) beside the two pawls (22), and the other ends of which are respectively pressed on the two pawls (22), so that the two pawls (22) are respectively inserted into tooth grooves of ratchet teeth (5 a) on the ratchet wheel (5) at corresponding positions;

looking up at the ratchet wheel (5), when the ratchet wheel (5) rotates in the anticlockwise direction, ratchet teeth (5 a) on the ratchet wheel (5) push the two pawls (22), and then the sleeve (3) is driven to synchronously rotate in the anticlockwise direction; when the ratchet wheel (5) is stationary, the two pawls (22) do not affect the rotation of the sleeve (3) in a counter-clockwise direction;

the wheelchair comprises a flat car (9) and a chair (12);

the flat car (9) consists of a flat plate (10), a step wheel (11) and a wheel shaft (21);

the flat plate (10) is a horizontal rectangular plate, and the longitudinal length of the flat plate is larger than the transverse width;

two wheel shafts (21), the front and the back of which are respectively and transversely fixedly connected to the flat plate (10), and the two ends of which extend outwards from the two lateral surfaces of the flat plate (10);

The step wheel (11) is formed by combining a side wheel (11 a) and a rail wheel (11 b) into a coaxial whole, the outer diameter of the side wheel (11 a) is larger than that of the rail wheel (11 b), and the side wheel (11 a) is positioned at the outer side of the rail wheel (11 b); four step wheels (11) are arranged on the flat plate (10), two step wheels (11) are respectively sleeved on two extending ends of a front wheel shaft (21) of the flat plate (10), the other two step wheels (11) are respectively sleeved on two extending ends of a rear wheel shaft (21) of the flat plate (10), and the four step wheels (11) can freely rotate on a vertical plane around respective axes but cannot axially move;

n flatbed trucks (9) are respectively placed on n pairs of disc grooves (1 b) of the turntable (2); of four stepped wheels (11) on each flat car (9), the side wheels (11 a) on two stepped wheels (11) on the same side are inserted into the corresponding side disc grooves (1 b) of a corresponding pair of disc grooves (1 b), the side wheels (11 a) on the other two stepped wheels (11) on the other side are inserted into the other side disc grooves (1 b) of the corresponding pair of disc grooves (1 b), the rail wheels (11 b) on the four stepped wheels (11) are movably contacted with the upper surface of the rotary disc (2) at corresponding positions, and when the rail wheels (11 b) on the four stepped wheels (11) roll along the upper surface of the rotary disc (2) in the same direction, the flat car (9) can only move radially and cannot move in the tangential direction;

The chair (12) is provided with a safety belt (13), one side of the safety belt is hung with a ball frame, and a plurality of soft balls are placed in the ball frame;

n chairs (12) are respectively and fixedly connected to the flat plates (10) of the n flat cars (9), and after n amusement operators sit on the n chairs (12) respectively, the n amusement operators face the upright posts (1);

the traction device comprises a rope (16) and a spring (17);

n ropes, one ends of which are fixedly connected with the outer circumferential surface of the outer ring of the auxiliary bearing (14) positioned at the upper end of the upright post (1) at corresponding positions respectively, and the other ends of which extend to the n chairs (12) along the radial direction respectively and are placed in corresponding ball frames for standby;

one ends of the n springs (17) are fixedly connected with the outer circumferential surface of the outer ring of the auxiliary bearing (14) which is close to the sleeve (3) at corresponding positions respectively, and the other ends of the n springs extend to the n flat cars (9) respectively in the radial direction and are hooked with the front ends of the upper flat plates (10) of the n flat cars (9) respectively in a movable way;

the power transmission system comprises a motor, an output wheel and a belt;

the output wheel is fixedly sleeved on the output shaft of the motor;

the belt is sleeved on the output wheel and a ratchet wheel (5) of the intermittent driving device;

looking up at the intermittent driving device, when the motor works, the ratchet wheel (5) is driven to rotate in the anticlockwise direction through the belt transmission, the ratchet wheel (5) pushes two pawls (22) on the sleeve (3) through ratchet teeth (5 a) on the ratchet wheel, so that the sleeve (3) synchronously rotates in the anticlockwise direction, and the sleeve (3) drives the rotary table (2) to synchronously rotate in the anticlockwise direction; when the motor stops working, the two pawls (22) do not prevent the sleeve (3) from rotating anticlockwise, so that the turntable (2) is connected with the sleeve (3) to continue rotating anticlockwise due to inertia; the turntable (2) has larger rotational inertia, so that the turntable (2) has larger rotational kinetic energy and small friction resistance, and according to the law of conservation of energy, the turntable (2) can rotate for a longer time, so that n-bit amusement players respectively sitting on n chairs (12) can have enough time to play amusement.

2. The amusement ride according to claim 1, wherein:

after n amusement operators sit on n chairs (12) respectively, the safety belt (13) is tied firmly, and then amusement is started; the following physical awareness is available in amusement:

firstly, a spring (17) is separated from a corresponding flat car (9), a player on the flat car (9) tightens a corresponding rope (16) by hand, the position of the flat car (9) relative to a rotary table (2) is unchanged, then a motor drives the rotary table (2) to slowly accelerate to rotate, and the player feels that the force of a handle of the rope (16) is gradually increased; when the rotating speed of the turntable (2) is constant, the player is connected to the flat car (9) to slowly keep away from the upright post (1), and the force of the handle of the rope (16) is felt to be larger;

the player obtains the perceptual knowledge of Newton's third law through feeling in person, obtains the perceptual knowledge of centripetal force, obtains the perceptual knowledge that the centripetal force increases with the increase of angular velocity under the condition that the radius of circular motion is unchanged and the quality is unchanged, and obtains the perceptual knowledge that the centripetal force increases with the increase of the radius of circular motion under the condition that the angular velocity is unchanged and the quality is unchanged;

secondly, the rope (16) is idle, the springs (17) are hooked with the corresponding flat car (9), and the motor drives the turntable (2) to slowly accelerate to rotate; only the flatbed (9) gradually leaves the upright post (1), and the spring (17) gradually stretches;

The player obtains the perception that the spring (17) can provide centripetal force through the feeling of being in person, and obtains the perception that the elasticity of the spring (17) increases along with the increase of the elongation of the spring;

thirdly, the ropes (16) are idle, the springs (17) are hooked with the corresponding flat car (9), and after the motor drives the turntable (2) to rotate, the back of a player on the flat car (9) is tightly pressed on the back plate of the corresponding chair (12), so that the upper body is difficult to tilt forwards; the higher the rotating speed of the rotary table (2), the harder the upper body is tilted forwards; if forward tilting is desired, the chair (12) needs to be pulled backwards by hand, unlike the case of sitting on a stool in a home;

through the in-person feeling, the amusement player obtains the perception that the circular motion of any object (such as an upper body) needs centripetal force, obtains the perception that a plurality of methods provide the centripetal force, and obtains the perception of Newton's third law;

fourthly, n ropes (16) are idle, n springs (17) are respectively hooked with n flat cars (9), and the motor drives the turntable (2) to rotate at a constant rotating speed; when the n flat cars (9) are kept relatively static relative to the turntable (2), some amusement operators are farthest from the upright post (1), and some amusement operators are nearest to the upright post (1); observing that the amusement park furthest from the upright post (1) is a fat or tall child, and the amusement park closest to the upright post (1) is a lean or short child;

The amusement player obtains the perception that the mass of the object is larger and the required centripetal force is larger under the condition of the same angular velocity by feeling in person;

fifthly, the rope (16) is idle, the springs (17) are hooked with the corresponding flat car (9), and the motor drives the turntable (2) to rotate at a constant rotating speed; the upper player of the flat car (9) vertically throws the soft ball, but the soft ball thrown upwards does not fall back into the hand, but flies away to the left of the throwing point, and is different from the situation of throwing the soft ball on the ground when standing on the ground;

the player obtains the sense of inertia through in-person feeling, and obtains the sense of tangential direction of the speed direction of the circular moving object;

sixthly, the rope (16) is idle, the springs (17) are hooked with the corresponding flat car (9), and the motor drives the turntable (2) to rotate at a constant rotating speed; the amusement machine on the flat car (9) horizontally throws the soft ball at the same hand-out speed to the left side and the right side respectively, and the amusement machine finds that the soft ball thrown to the left side flies far and the soft ball thrown to the right side flies near;

the player obtains the perception of the speed of the division and the combination through the feeling of the person in person, and obtains the perception of the speed combination on the same straight line;

Seventhly, two symmetrical ropes (16) are idle, two symmetrical springs (17) are respectively hooked with corresponding flat cars (9), and a motor drives the turntable (2) to rotate at a constant rotating speed; two amusement players which are symmetrical mutually transmit soft balls, the soft balls cannot be transmitted to the hands of the other party according to the ball transmission mode on the ground, and the rough method is finally obtained through continuous exploration;

the player obtains the perception of combining two speeds at an angle through feeling in person;

eight, n springs (17) are respectively hooked with n flat cars (9), the motor stops working, when the turntable (2) is still rotating, n amusement players pull the ropes (16) respectively, so that the n flat cars (9) are all close to the upright posts (1), unexpected situations occur, and the rotating speed of the turntable (2) is accelerated;

the amusement player obtains the inductive knowledge of the moment of inertia through the in-person feeling, and obtains the inductive knowledge of conservation of the angular momentum of the system under the condition that the external force moment of the system is zero or negligible.

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