Conical pendulum demonstrator

Abstract

The invention discloses a conical pendulum demonstrator which is small in size and convenient to move and use, facilitates observation of angular velocity, swinging ball rope length and swinging angle, facilitates comparative observation of motion rules of swinging balls with different masses and swinging rope lengths, is controlled through voice or keys, and is simple to operate. The first motor drives the vertical rod to rotate, the size is small, the structure is compact, taking is convenient, the swing balls rapidly enter a stable swing state through the arrangement of the clamping plates on the two sides of the vertical rod, the swing angle can be fixed through the limiting comb teeth so that the swing angle can be observed after stopping, meanwhile, the multiple swing balls with different masses and rope lengths are arranged, and comparison observation is facilitated.

Description

Technical Field

[0001] The invention relates to a teaching aid, in particular to a cone pendulum demonstrator for measuring the motion law of the cone pendulum. Technical Background Most of the existing conical pendulum demonstrators have the following problems: the teaching aids are large in size, inconvenient to move and operate; it is not convenient to adjust the speed and observe parameters such as the swing angle and the length of the swing rope, and it is even more inconvenient to read the parameters in the rotating state; the phase angle of the swinging ball often lags behind the rotation speed of the shaft at the beginning of the rotation, and it takes a long time for the swinging ball to enter a stable swinging state; the teaching aids can only hold one swinging ball, which is not convenient for observing the swinging rules of swinging balls of different masses and different rope lengths. Summary of the invention

[0003] In order to overcome the problems of the prior art cone pendulum demonstrator teaching body being large in size, inconvenient to move and operate, inconvenient to adjust the speed and observe the angle, a long time for the swinging ball to enter a stable swinging state, and inconvenient to observe the swinging laws of swinging balls of different masses and rope lengths, the present invention provides a cone pendulum demonstrator with small size and compact structure. It is easy to move and operate through voice control and button control, a scale is provided on the clamping plate, which is convenient for observing the length and swinging angle of the swinging rope. The setting of the clamping plate can make the cone pendulum quickly enter a stable state, thereby improving the use efficiency. The limit comb teeth fix the swinging rope after the rotation is stable, and it is convenient to read the swinging angle after it is stationary. In addition, a plurality of observation balls with different masses and different pendulum lengths can be installed at the same time, which is convenient for observing and comparing the swinging laws of swinging balls of different masses and different rope lengths.

[0004] To solve the above-mentioned purpose, the present invention adopts the following technical solutions: The present invention provides a conical pendulum demonstrator, comprising a base, a vertical pole and a swinging ball. A first motor is arranged in the base, a driving end of the first motor is fixedly connected to the vertical pole, a swinging ball connected by a flexible connecting piece is fixed to the upper end of the vertical pole, two clamping plates are arranged opposite to each other on both sides of the vertical pole, the swinging ball and the flexible connecting piece are located between the gaps between the two clamping plates, the swinging ball can be centrifugally lifted along the fixed point as the vertical pole rotates, when the vertical pole of the conical pendulum demonstrator rotates driven by the first motor, the flexible connecting piece connected to the vertical pole also rotates with the swinging ball and is centrifugally lifted. The design structure of the present invention is compact, small in size, and easy to move and operate; the arrangement of the clamping plate enables the phase angle of the swinging ball to synchronize with the rotation speed of the vertical pole more quickly, so that the conical pendulum moves more quickly in a stable state, and avoids the phase angle of the swinging ball lagging behind the rotation speed of the rotating vertical pole for a long time after the rotation starts, thereby improving the use efficiency.

[0005] Furthermore, the flexible connecting member is a swinging rope.

[0006] Furthermore, an arc groove is concentrically arranged on the clamping plate along the fixed point of the swinging ball, a limit plate is inserted on the arc groove, and limit comb teeth are evenly distributed on the limit plate, so that the swinging rope of the swinging ball can be stuck between the comb teeth, and a connecting plate is fixedly arranged on the other side of the comb teeth of the limit plate, and a second motor is fixedly arranged on one of the clamping plates, and a driving rod of the second motor is fixedly connected to the connecting plate, and the driving rod of the second motor is perpendicular to the connecting plate, and the connecting plate can be set away from or close to the swinging ball by controlling the driving rod of the second motor. In the process from static to rotation of the vertical pole, the driving rod of the second motor is controlled to make the comb teeth away from the swinging rope, and the swinging ball can be stabilized at a certain angle with the rotation of the vertical pole, and when the swinging rope is stabilized at a certain angle, the second motor is controlled to make the comb teeth on the connecting plate approach the swinging rope and clamp the swinging rope, and when the rotation stops, the comb teeth still clamp the swinging rope, and at this time, the swinging angle when the rotation is stable can be clearly observed.

[0007] Furthermore, positioning holes are provided on the splint and the connecting plate at the position intersecting with a vertical line of the splint plate surface, and a positioning rod is sleeved in the positioning hole, and baffles are provided at both ends of the positioning rod. The setting of the positioning rod makes the connecting plate move more stably when the second motor drive rod pulls the comb teeth closer or pushes them away.

[0008] Furthermore, the clamping plate is a transparent clamping plate, on which a scale for measuring the length and the swing angle of the swing rope is provided. The transparent clamping plate is convenient for observing the motion parameters of the swinging ball and for reading the length and the swing angle of the swing rope.

[0009] Furthermore, a limit block is provided at the top of the vertical pole, the limit block is clamped between the clamping plates, and a limit groove is provided on the limit block. The swing rope of the swing ball passes through the limit groove and can slide and change the angle in the limit groove as the vertical pole rotates. The limit block allows the swing ball to swing within a certain range, preventing the swing ball from escaping from the clamping plates, and further allowing the conical pendulum motion of the swing ball to quickly be in a stable state.

[0010] Furthermore, the number of the swinging balls is greater than one, and a plurality of swinging balls with different masses and different pendulum rope lengths can be provided, so as to facilitate comparative observation of the motion laws of the swinging balls with different masses and rope lengths when performing conical pendulum motion.

[0011] Furthermore, a liquid crystal display screen for displaying the angular velocity is provided on the base, and the liquid crystal display screen is electrically connected to the first motor. The liquid crystal display screen displays the angular velocity, has good visibility, and is convenient for reading the angular velocity.

[0012] Furthermore, a control device is provided on the base for controlling the opening and closing of the demonstrator, adjusting the rotation angular velocity of the vertical rod, and controlling the movement of the driving end of the second motor, making the conical pendulum demonstrator more convenient to use.

[0013] Furthermore, the control device may be a voice control module and / or a control button, and the user may control the conical pendulum demonstrator through voice control and / or buttons, which is convenient and quick.

[0014] A method for using a conical pendulum demonstrator comprises the following steps: first, observing the length of a swing rope of a swinging ball in a stationary state; next, using voice control or a manipulation button to adjust the rotation speed of the conical pendulum demonstrator, so that the vertical rod of the conical pendulum demonstrator rotates according to a set angular velocity, driving the swinging ball to form a conical pendulum motion, and at this time, the angular velocity value on a liquid crystal display can be observed; when the conical pendulum motion is stable, adjusting a second motor so that a limit comb tooth clamps the swing rope under the drive of the second motor, thereby stabilizing the conical pendulum motion; after stopping, observing the scale line on a transparent clamping plate to measure the swing angle of the swinging ball. The beneficial effects of the present invention are that the conical pendulum can move faster and in a stable state through the setting of the clamping plate, avoiding the phase angle of the swinging ball lagging behind the rotation speed of the upright pole for a long time after starting, thereby improving the use efficiency; the setting of the transparent clamping plate and the scale makes it convenient to read the numerical value, and the length of the swinging rope can be read when it is stationary. After the conical pendulum movement reaches stability, the second motor is used to pull the control limit comb teeth to lock the angle of the swinging rope, and the angle on the transparent clamping plate can be read after the movement stops, which is accurate and convenient; the setting of the first motor and the upright pole makes the overall volume small and the structure compact, which is convenient to take and use; multiple swinging balls with different masses and rope lengths can be set at the same time, which is convenient for comparative observation; voice control and button control make the operation of the conical pendulum demonstrator more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the overall schematic diagram of the conical pendulum demonstrator.

[0016] Figure 2 This is the overall schematic diagram of the conical pendulum demonstrator.

[0017] Figure 3 This is the overall schematic diagram of the conical pendulum demonstrator.

[0018] Figure 4 Schematic diagram of the conical pendulum demonstrator after removing the splint, connecting plate and limit plate.

[0019] in: 1. Base; 2. Swing rope; 3. Vertical pole; 4. Swing ball; 5. Clamp; 6. Arc groove; 7. Limit plate; 8. Limit comb teeth; 9. Connecting plate; 10. Second motor; 11. Limit groove; 12. Positioning hole; 13. LCD screen; 14. Limit block; 15. Positioning rod; 16. Block; 17. Button; 18. Second motor driving rod. DETAILED DESCRIPTION

[0020] In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0021] See attached Figure 1-4 A conical pendulum demonstrator in this embodiment includes a base 1, a vertical pole 3, and a swinging ball 4. A first motor is provided in the base 1. The driving end of the first motor is fixedly connected to the vertical pole 3. The upper end of the vertical pole 3 is fixed with a swinging ball 4 connected by a flexible connector. Two clamping plates 5 are oppositely provided on both sides of the vertical pole 3. The swinging ball 4 and the flexible connector are located between the gaps of the two clamping plates 5. The swinging ball 4 can be centrifugally lifted along the fixed point of the swinging ball 4 as the vertical pole 3 rotates.

[0022] In this embodiment, the flexible connecting member is a swing rope 2.

[0023] In this embodiment, an arc groove 6 is concentrically arranged on the splint 5 along the fixed point of the swinging ball 4, a limit plate 7 is inserted on the arc groove 6, and the limit plate 7 is provided with evenly distributed limit comb teeth 8, and the swinging rope 2 of the swinging ball 4 can be stuck between the comb teeth. A connecting plate 9 is fixedly arranged on the other side of the comb teeth of the limit plate 7, and a second motor 10 is fixedly arranged on one of the splints 5, and a second motor driving rod 18 is fixedly connected to the connecting plate 9, and the second motor driving rod 18 is perpendicular to the connecting plate 9.

[0024] In this embodiment, the clamping plate 5 and the connecting plate 9 are provided with positioning holes 12 at positions intersecting a vertical line of the clamping plate 5 , and a positioning rod 15 is sleeved in the positioning hole 12 , and baffles 16 are provided at both ends of the positioning rod 15 .

[0025] In this embodiment, the clamping plate 5 is a transparent plate, and a scale for measuring the length and / or the swing angle of the swing rope 2 is provided on the clamping plate 5 .

[0026] In this embodiment, a limit block 14 is provided at the top of the vertical pole 3, and the limit block 14 is clamped between the clamping plates 5. A limit groove 11 is provided on the limit block 14. The swing rope 2 of the swing ball 4 passes through the limit groove 11 and can slide and change the angle in the limit groove 11 as the vertical pole 3 rotates.

[0027] In this embodiment, the number of the swinging balls 4 is greater than one.

[0028] In this embodiment, a liquid crystal display screen 13 for displaying angular velocity is disposed on the base 1 , and the liquid crystal display screen 13 is electrically connected to the first motor.

[0029] In this embodiment, a control device is provided on the base 1 for controlling the opening and closing of the demonstrator, adjusting the rotational angular velocity of the upright 3 , and controlling the movement of the driving end of the second motor 10 .

[0030] In this embodiment, the control device is a voice control module and / or a control button 17 .

[0031] The method for using the cone pendulum demonstrator in this embodiment includes the following steps: Observe the length of the swing rope 2 of the swing ball 4 in a stationary state; The voice control or the operation button 17 adjusts the rotation speed of the pole 3 of the cone pendulum demonstrator, so that the pole 3 of the cone pendulum demonstrator rotates according to the set angular velocity, drives the swinging ball 4 to form a cone pendulum motion, and reads the angular velocity value on the LCD screen 13; When the conical pendulum motion is stable, the second motor 10 is adjusted so that the limiting comb teeth 8 clamp the swing rope 2 under the drive of the second motor 10 to stabilize the conical pendulum motion; After stopping, the swing angle of the swing ball 4 is measured by observing the scale lines on the clamping plate 5 .

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A conical pendulum demonstrator, comprising a base (1), a vertical rod (3), and a swinging ball (4), characterized in that: The base (1) is provided with a first motor, the driving end of the first motor is fixedly connected to the vertical pole (3), the upper end of the vertical pole (3) is fixed with a swinging ball (4) connected by a flexible connecting piece, two clamping plates (5) are arranged opposite to each other on both sides of the vertical pole (3), the swinging ball (4) and the flexible connecting piece are located between the gaps of the two clamping plates (5), and the swinging ball (4) can be centrifugally lifted along the fixed point of the swinging ball (4) as the vertical pole (3) rotates.

2. A conical pendulum demonstrator as claimed in claim 1, characterized in that: The flexible connecting piece is a swing rope (2).

3. A conical pendulum demonstrator as claimed in claim 2, characterized in that: An arc groove (6) is concentrically arranged on the clamping plate (5) along the fixed point of the swinging ball (4), a limiting plate (7) is inserted into the arc groove (6), and the limiting plate (7) is provided with evenly distributed limiting comb teeth (8), and the swinging rope (2) of the swinging ball (4) can be stuck between the comb teeth. A connecting plate (9) is fixedly arranged on the other side of the comb teeth of the limiting plate (7), and a second motor (10) is fixedly arranged on one of the clamping plates (5), and a second motor driving rod (18) is fixedly connected to the connecting plate (9), and the second motor driving rod (18) is perpendicular to the connecting plate (9).

4. A conical pendulum demonstrator as claimed in claim 3, characterized in that: The clamping plate (5) and the connecting plate (9) are provided with positioning holes (12) at positions intersecting a vertical line on the plate surface of the clamping plate (5), a positioning rod (15) is sleeved in the positioning hole (12), and blocking pieces (16) are provided at both ends of the positioning rod (15).

5. A conical pendulum demonstrator as claimed in claim 2, characterized in that: The clamping plate (5) is a transparent plate, and a scale for measuring the length and / or the swing angle of the swing rope (2) is provided on the clamping plate (5).

6. A conical pendulum demonstrator as claimed in claim 2, characterized in that: A limit block (14) is provided at the top end of the vertical rod (3), the limit block (14) is clamped between the clamping plates (5), a limit slot (11) is provided on the limit block (14), a swing rope (2) of the swing ball (4) passes through the limit slot (11) and can slide in the limit slot (11) to change its angle as the vertical rod (3) rotates.

7. A conical pendulum demonstrator as claimed in claim 1, characterized in that: The number of the swinging balls (4) is greater than one.

8. A conical pendulum demonstrator as claimed in claim 1, characterized in that: A liquid crystal display screen (13) for displaying angular velocity is provided on the base (1), and the liquid crystal display screen (13) is electrically connected to the first motor.

9. A conical pendulum demonstrator as claimed in claim 1, characterized in that: The base (1) is provided with a control device for controlling the opening and closing of the demonstrator, adjusting the rotational angular velocity of the upright (3), and controlling the movement of the driving end of the second motor (10).

10. A conical pendulum demonstrator as claimed in claim 9, characterized in that: The control device is a voice control module and / or a control button (17).

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