Angular momentum conservation demonstration instrument

Abstract

The utility model discloses an angular momentum conservation demonstration instrument, which relates to the technical field of teaching demonstration instruments and comprises a disc, a plurality of balancing weights, a mounting rod and a base, the edge of the disc is provided with a plurality of inner channels, the balancing weights are respectively arranged in the inner channels in a sliding manner, the base is positioned below the disc, and the mounting rod is fixedly mounted at the bottom of the disc. The bottom of the mounting rod is mounted above the base through a bearing, a gas collecting cavity is formed in the center of the interior of the disc and communicates with the multiple inner channels, and a driving adjusting assembly used for adjusting the position of the balancing weight is arranged on one side of the base; the driving adjusting assembly comprises an inflator and an air conveying pipe. The inflator is arranged on one side of the base. According to the angular momentum conservation demonstration device, the position of the balancing weight is adjusted by driving the adjusting assembly, angular momentum conservation demonstration can be conveniently carried out, control is carried out through air pressure, it can be guaranteed that demonstration parts used in the disc are not affected by adjusting equipment, and therefore high demonstration accuracy can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of teaching demonstration instruments, specifically to a demonstration instrument for conservation of angular momentum. Background Technology

[0002] In physics class, students learn about the law of conservation of energy, which includes the law of conservation of angular momentum. However, students only learn this physics knowledge from textbooks and cannot intuitively experience the magical effects of the law of conservation of angular momentum through equipment.

[0003] Patent document CN202352186U discloses a portable angular momentum conservation instrument. The support consists of three movably connected plates fixed to a base to form a square frame. A lower rotating shaft is fixed in the lower cylinder of the mounting box within the frame, with the other end of the lower rotating shaft resting on a support bearing on the base. An upper rotating shaft is fixed in the upper cylinder of the mounting box, with the other end of the upper rotating shaft passing through a fixing hole on the support. Left and right horizontal cylinders are fixed in the cylinders on the left and right sides of the mounting box, respectively, with fixing screws installed at the two ends of the horizontal cylinders. A winding device is installed inside the mounting box, with one end passing through a hole at the back and the other end connected to the rotating shaft of a geared motor. The midpoint of the pull wire is fixed on the winding device, and both ends are connected to stainless steel balls and placed inside the cylinders. A geared motor, a battery, and a remote control circuit board are installed inside the mounting box.

[0004] The portable angular momentum conservation instrument provided by the above technical solution uses a motor to assist in the demonstration. Although this method can adjust the position of the counterweight, the motor also rotates synchronously. The motor is not in the center of the entire rotation system. Due to the centrifugal force, the motor affects the overall rotation system, which in turn affects the accuracy of the experiment. Utility Model Content

[0005] The purpose of this invention is to provide an angular momentum conservation demonstration instrument, which solves the problem of the driving structure affecting the experimental accuracy.

[0006] This utility model solves the above-mentioned technical problems through the following technical solution: This utility model includes a disc, multiple counterweights, a mounting rod, and a base. The disc has multiple inner channels on its edge, and the multiple counterweights are slidably disposed in the multiple inner channels. The base is located below the disc, and the mounting rod is fixedly installed at the bottom of the disc. The bottom of the mounting rod is mounted on the top of the base through a bearing. An air collecting chamber is opened at the center of the disc, and the air collecting chamber is connected to the multiple inner channels. A drive adjustment component for adjusting the position of the counterweights is provided on one side of the base.

[0007] The drive adjustment assembly includes an air cylinder and an air supply pipe. The air cylinder is located on one side of the base, and an inner cavity is opened inside the base. The air supply pipe is installed at the air supply end of the inner cavity and the air cylinder. An air guide groove is opened inside the mounting rod, which communicates with the air collection chamber and the inner cavity.

[0008] Preferably, the disk is made of a transparent material.

[0009] Preferably, the counterweight is wrapped with a rubber layer on the outside.

[0010] Preferably, a screw rod is installed on the top of the disc, and an anti-slip groove is provided above the screw rod.

[0011] Preferably, a sealing ring is installed on the inner wall of the cavity, and the sealing ring is attached to the bottom of the mounting rod.

[0012] Preferably, a built-in limiting ring is installed on the inner wall of the inner channel, and the built-in limiting ring is located inside the counterweight.

[0013] Preferably, an external limiting ring is installed on the inner wall of the inner channel, the external limiting ring being located outside the counterweight and at the edge of the disc.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention adjusts the position of the counterweight by driving the adjustment component, which facilitates the demonstration of conservation of angular momentum. Since it is controlled by air pressure, it can be ensured that the adjustment device will not affect the demonstration components used in the disc, thus ensuring high accuracy of the demonstration. Attached Figure Description

[0016] Figure 1 This is a structural view of the present invention;

[0017] Figure 2 This is a cross-sectional view of the disk of this utility model;

[0018] Figure 3 This is a cross-sectional view of the base of this utility model.

[0019] The numbers in the diagram represent:

[0020] 1. Disc; 2. Counterweight; 3. Mounting rod; 4. Base; 5. Inner channel; 6. Bearing; 7. Air collection chamber; 8. Drive adjustment assembly; 801. Air cylinder; 802. Air supply pipe; 9. Inner cavity; 10. Air guide groove; 11. Rubber layer; 12. Tightening rod; 13. Anti-slip groove; 14. Sealing ring; 15. Built-in limit ring; 16. External limit ring. Detailed Implementation

[0021] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings.

[0022] This utility model provides a technical solution: an angular momentum conservation demonstration device, such as... Figures 1-3 As shown, this utility model includes a disc 1, multiple counterweights 2, a mounting rod 3, and a base 4. Multiple inner channels 5 are formed along the edge of the disc 1, and the multiple counterweights 2 are slidably disposed within these inner channels 5. The position of each counterweight 2 within an inner channel 5 should be equidistant from the center of the disc 1. The base 4 is located below the disc 1. The mounting rod 3 is fixedly installed at the bottom of the disc 1, and its bottom is mounted above the base 4 via a bearing 6, allowing the upper disc 1 to rotate. An air collecting chamber 7 is formed at the center of the disc 1, communicating with the multiple inner channels 5. A device for adjusting the position of the counterweights 2 is provided on one side of the base 4. The drive adjustment component 8 includes an air cylinder 801 and an air supply pipe 802. The air cylinder 801 is located on one side of the base 4. The base 4 has an inner cavity 9. The air supply pipe 802 is installed at the air supply end of the inner cavity 9 and the air cylinder 801. The mounting rod 3 has an air guide groove 10 that communicates with the air collection chamber 7 and the inner cavity 9. The air cylinder 801 can control the air pressure inside the inner cavity 9, the air guide groove 10, the air collection chamber 7 and the inner channel 5. The air pressure can be used to control the position of each counterweight 2, thereby enabling rapid adjustment of the position of the counterweight 2. After adjusting the position of the counterweight 2, the rotation speed of the disc 1 can be observed to visually demonstrate the phenomenon of conservation of angular momentum.

[0023] Furthermore, the disc 1 is made of transparent material, so it is easy to observe the changes in the state of the disc 1 when the position of the internal counterweight 2 changes. At the same time, the counterweight 2 can be selected in other colors, which makes it even easier to observe.

[0024] Furthermore, the counterweight 2 is wrapped with a rubber layer 11 on the outside. The rubber layer 11 can ensure a sealed contact between the counterweight 2 and the inner channel 5, thereby ensuring that the movement of the counterweight 2 can be accurately controlled.

[0025] Furthermore, a lever 12 is installed on the top of the disc 1, and an anti-slip groove 13 is provided above the lever 12. The lever 12 can be used to control the braking of the disc 1.

[0026] Furthermore, a sealing ring 14 is installed on the inner wall of the inner cavity 9. The sealing ring 14 is attached to the bottom of the mounting rod 3. The sealing ring 14 can ensure good sealing at the connection between the mounting rod 3 and the base 4, and prevent air leakage.

[0027] Furthermore, an internal limiting ring 15 is installed on the inner wall of the inner channel 5. The internal limiting ring 15 is located inside the counterweight 2. The position of the counterweight 2 can be limited by the internal limiting ring 15, which can prevent the counterweight 2 from moving to the air collecting chamber 7.

[0028] Furthermore, an external limiting ring 16 is installed on the inner wall of the inner channel 5. The external limiting ring 16 is located outside the counterweight 2 and the limiting ring is located at the edge of the disc 1. The external limiting ring 16 can prevent the counterweight 2 from moving out of the inner channel 5.

[0029] In use, this invention allows for the positional control of the counterweight 2 via the pneumatic adjustment component 8, facilitating a demonstration of the conservation of angular momentum. Because pneumatic control is used, the adjustment device will not affect the demonstration components within the disc 1, ensuring high accuracy. During the demonstration, the disc 1 is rotated by tightening the top screw, and air is injected into the base 4 using the air cylinder 801, increasing the air pressure within the base 4. Under this pressure, the gas can pass through the air guide... The slot 10 enters the air collection chamber 7 and each inner channel 5, so the air pressure can push each counterweight 2 outward, thereby achieving the effect of moving the counterweight 2 outward. The counterweight 2 is away from the center of the disk 1. Then, due to the conservation of angular momentum, the rotation speed of the disk 1 can slow down. The air in the inner cavity 9 of the base 4 is drawn outward by the air cylinder 801, and a negative pressure is generated in the inner cavity 9. Under the attraction of the negative pressure, each counterweight 2 can be attracted and moved inward. The counterweight 2 is closer to the center of the disk 1. Then, due to the conservation of angular momentum, the rotation speed of the disk 1 can increase.

[0030] The above are merely preferred embodiments of this utility model and are illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of this utility model, all of which will fall within the protection scope of this utility model.

Claims

1. A kind of angular momentum conservation demonstration instrument, including disc (1), multiple counterweight (2), installation rod (3) and base (4);Multiple inner passages (5) are set in the edge of the disc (1), multiple the counterweight (2) is respectively slid in multiple inner passages (5), the base (4) is located below disc (1), the installation rod (3) is fixedly installed in the bottom of disc (1), the bottom of the installation rod (3) is installed above the base (4) by bearing (6), it is characterized in that: Gas collection cavity (7) is set in the inside center position of the disc (1), the gas collection cavity (7) is communicated with multiple inner passages (5), the base (4) one side is provided with the drive adjusting assembly (8) for adjusting the position of counterweight (2); The drive adjusting assembly (8) includes air cylinder (801) and gas pipe (802), the air cylinder (801) is set in the one side of base (4), the inner cavity (9) is set in the inside of base (4), the gas pipe (802) is installed in the inner cavity (9) and the gas delivery end of air cylinder (801), the installation rod (3) is set in the gas guide groove (10) that is communicated with gas collection cavity (7) and inner cavity (9) with.

2. The angular momentum conservation demonstration apparatus of claim 1, wherein The disc (1) is made of transparent material.

3. The angular momentum conservation demonstration apparatus of claim 2, wherein The outer side of the counterweight (2) is wrapped with rubber layer (11).

4. The angular momentum conservation demonstration apparatus of claim 2, wherein The top of the disc (1) is installed with screw rod (12), the anti-skid groove (13) is set in the top of screw rod (12).

5. The angular momentum conservation demonstration apparatus of claim 2, wherein The inner wall of the inner cavity (9) is installed with sealing ring (14), the sealing ring (14) is attached in the bottom of installation rod (3).

6. The angular momentum conservation demonstration apparatus of claim 2, wherein The inner wall of the inner passage (5) is installed with built-in limit ring (15), the built-in limit ring (15) is located in the inner side of counterweight (2).

7. The angular momentum conservation demonstration apparatus of claim 2 or 6, wherein The inner wall of the inner passage (5) is installed with external limit ring (16), the external limit ring (16) is located in the outer side of counterweight (2) and the limit ring is located in the edge of disc (1).

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