CN219676759U - Angular momentum conservation law demonstration instrument - Google Patents

Abstract

The utility model discloses an angular momentum conservation law demonstration instrument which comprises a rotary table and a rotary shaft, wherein the rotary shaft is perpendicular to the center of the upper surface of the rotary table and is in rotary connection with the rotary table, the rotary table is used for driving the rotary shaft to rotate around the center of the upper surface of the rotary table, first telescopic rods are symmetrically arranged on the left side and the right side of the rotary shaft, the output ends of the first telescopic rods are positioned at one end far away from the rotary shaft, the output ends of the two first telescopic rods are connected with clamping devices, and the clamping devices are connected with mass blocks. The utility model can respectively demonstrate the angular momentum conservation law under the three conditions of constant moment of inertia, increased moment of inertia and reduced moment of inertia; the demonstration process can be operated remotely, so that potential safety hazards existing in the traditional demonstration experiment devices such as Ru Kefu Stokes swivel chairs and the like are avoided, and the demonstration process is convenient to carry out; the demonstration phenomenon of the utility model is clear and visual, has good repeatability and is beneficial to understanding the deepened diagonal momentum conservation law.

Description

Angular momentum conservation law demonstration instrument

Technical Field

The utility model relates to a physical demonstration experiment device, in particular to an angular momentum conservation law demonstrator.

Background

The law of conservation of angular momentum is an important piece of physical teaching. In classroom teaching, a Takowski swivel chair is generally used for demonstrating the angular momentum conservation rule of an object when the relative rotating shaft position of the mass changes, but the device has a great potential safety hazard, an experimenter is required to grip a dumbbell on the swivel chair by hands during demonstration, the moment of inertia is changed by outwards stretching or inwards shrinking the double arms in the swivel chair rotating process, if the dumbbell drops off from the experimenter carelessly, danger is brought to the experimenter or a surrounding observer, and when the swivel chair rotates at a high speed, the experimenter easily dizziness and even fall off the swivel chair.

The utility model patent with the publication number of CN201965817U provides a demonstrator for demonstrating the law of conservation of angular momentum by utilizing an hourglass, which can demonstrate the law of conservation of angular momentum when the moment of inertia is reduced due to the reduction of the mass of the hourglass, but cannot clearly demonstrate the law of conservation of angular momentum of an object when the position of the mass relative to a rotating shaft is changed.

Disclosure of Invention

The utility model aims to provide an angular momentum conservation law demonstrator which can conveniently demonstrate the angular momentum conservation laws under various conditions and can avoid potential safety hazards in the experimental process.

The utility model is realized by the following technical scheme:

the utility model provides an angular momentum conservation law demonstration appearance, includes carousel and pivot, the pivot perpendicular to the center of carousel upper surface and with the carousel rotates to be connected, the carousel is used for the drive the pivot is around the center rotation of carousel upper surface, the left and right sides symmetry of pivot is provided with first telescopic link, the output of first telescopic link is located and keeps away from the one end of pivot, two the output of first telescopic link all is connected with the holder, the holder is connected with the quality piece.

In one embodiment of the present utility model, the first telescopic rod is vertically connected to a side wall of the rotating shaft.

In one embodiment of the utility model, a second telescopic rod is arranged in the clamp holder, the clamp holder clamps the second telescopic rod, and the mass block is connected with the output end of the second telescopic rod.

In one embodiment of the utility model, the cross section of the clamp holder is circular, the side wall of the clamp holder is provided with a connecting hole, and a fastener is connected in the connecting hole.

In one embodiment of the present utility model, the first telescopic rod and the second telescopic rod are both electric push rods, and the turntable is an electric turntable.

In one embodiment of the present utility model, the length direction of the rod body of the second telescopic rod is parallel to the axis of the rotating shaft.

In one embodiment of the utility model, the rotating shaft is a hollow cylindrical tube, a power box is arranged at the top of the rotating shaft, a rechargeable battery is arranged in the power box, and the rechargeable battery is electrically connected with the first telescopic rod and the second telescopic rod through wires penetrating through the rotating shaft.

In one embodiment of the utility model, the surface of the power supply box is provided with a charging interface.

In one embodiment of the utility model, the mass is a solid iron ball.

In one embodiment of the utility model, the mass block is a T-shaped cylinder and is formed by coaxially connecting a first cylinder and a second cylinder, the diameter of the second cylinder is larger than the inner diameter of the clamp holder, the diameter of the first cylinder is smaller than the inner diameter of the clamp holder, the first cylinder is inserted into the clamp holder to be fixed, and the second cylinder is erected on the clamp holder.

Compared with the prior art, the utility model has the beneficial effects that:

1. the utility model can respectively demonstrate the angular momentum conservation law under the three conditions of constant moment of inertia, increased moment of inertia and reduced moment of inertia.

2. The utility model can be operated remotely in the demonstration process, avoids potential safety hazards existing in the traditional demonstration experiment devices such as Ru Kefu Style swivel chairs and the like, and facilitates the demonstration process.

3. The demonstration phenomenon is clear and visual, the repeatability is good, and the understanding of the deepened diagonal momentum conservation law is facilitated.

Drawings

Fig. 1 is a front view of a demonstrator for conservation of angular momentum in embodiment 1 of the utility model;

FIG. 2 is a top view of the angular momentum conservation law demonstrator of embodiment 1 of the utility model;

FIG. 3 is a front view of the angular momentum conservation law demonstrator of embodiment 2 of the utility model;

fig. 4 is a perspective view of a mass block in embodiment 2 of the present utility model.

In the figure: 1. a turntable; 2. a rotating shaft; 3. a first telescopic rod; 4. a holder; 5. a second telescopic rod; 6. a mass block; 61. a first column; 62. a second column; 7. a power supply box; 71. and a charging interface.

Detailed Description

In order that the manner in which the above recited objects, features and advantages of the present utility model are attained and can be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. Wherein like parts are designated by like reference numerals.

In the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Example 1

Referring to fig. 1 and fig. 2, an angular momentum conservation law demonstration instrument comprises a rotary table 1 and a rotary shaft 2, wherein the rotary shaft 2 is perpendicular to the center of the upper surface of the rotary table 1 and is rotationally connected with the rotary table 1, the rotary table 1 is used for driving the rotary shaft 2 to rotate around the center of the upper surface of the rotary table 1, first telescopic rods 3 are symmetrically arranged on the left side and the right side of the rotary shaft 2, the output ends of the first telescopic rods 3 are located at one ends far away from the rotary shaft 2, the output ends of the two first telescopic rods 3 are respectively connected with a clamp holder 4, and the clamp holders 4 are connected with a mass block 6.

Optionally, the first telescopic rod 3 is vertically connected to a side wall of the rotating shaft 2.

Optionally, a second telescopic rod 5 is arranged in the holder 4, the holder 4 holds the second telescopic rod 5, and the mass block 6 is connected with the output end of the second telescopic rod 5.

Optionally, the section of the holder 4 is circular, a connecting hole is formed in the side wall of the holder 4, a fastening piece is connected in the connecting hole, and the object to be held is fixed in the holder 4 through the fastening piece passing through the connecting hole.

Optionally, the first telescopic rod 3 and the second telescopic rod 5 are electric push rods, the turntable 1 is an electric turntable, and the telescopic operation of the first telescopic rod 3 and the second telescopic rod 5 and the rotation of the turntable 1 can be controlled by a remote controller.

Optionally, the length direction of the rod body of the second telescopic rod 5 is parallel to the axis of the rotating shaft 2.

Optionally, the mass block 6 is a solid iron ball.

Optionally, the rotating shaft 2 is a hollow cylindrical tube, a power supply box 7 is arranged at the top of the rotating shaft 2, a rechargeable battery is arranged in the power supply box 7, and the rechargeable battery is electrically connected with the first telescopic rod 3 and the second telescopic rod 5 through wires penetrating through the rotating shaft 2 to supply power to the first telescopic rod 3 and the second telescopic rod 5, and a charging interface 71 is arranged on the surface of the power supply box 7.

The content and principle can be demonstrated:

the utility model can respectively demonstrate the angular momentum conservation law under the three conditions of constant moment of inertia, increased moment of inertia and reduced moment of inertia.

When the angular momentum conservation law demonstrator provided by the utility model is used, the first telescopic rod 3 is firstly in the shortest state, the rotary table 1 is rotated, and the rotary shaft 2 drives the first telescopic rod 3, the second telescopic rod 5 and the mass block 6 to synchronously rotate. Then, the second telescopic rod 5 is extended upwards simultaneously, so that the mass block 6 is driven to move upwards, and the rotation speed is not changed. Then, the second telescopic rod 5 is simultaneously contracted downwards to drive the mass block 6 to move downwards, and the rotation speed is observed to be unchanged at the moment. The reason is that the vertical distance between the second telescopic rod 5 and the mass block 6 and the rotating shaft 2 is always kept unchanged in the upward or downward moving process, so that the moment of inertia of the whole device around the rotating shaft 2 is unchanged, the condition that the rotating speed is not changed can be observed, and the law of conservation of angular momentum when the moment of inertia is unchanged can be demonstrated.

Then, the first telescopic rod 3 is simultaneously extended outwards, at this time, the second telescopic rod 5 and the mass block 6 move together in a direction away from the rotating shaft 2, the rotation inertia of the whole device around the rotating shaft 2 becomes large, and the rotating speed is observed to be slower and slower. Then, the first telescopic rod 3 is retracted inwards at the same time, at this time, the second telescopic rod 5 and the mass block 6 move together in a direction approaching the rotating shaft 2, the moment of inertia of the whole device around the rotating shaft 2 becomes small, and the rotating speed is observed to be faster and faster. Thereby demonstrating the law of conservation of angular momentum as the moment of inertia increases and decreases, respectively.

Example 2

Referring to fig. 3 and 4, the difference between this embodiment and embodiment 1 is that the mass block 6 is fixedly connected in the holder 4, and the mass block 6 of this embodiment is a T-shaped cylinder, and is formed by coaxially connecting a first cylinder 61 and a second cylinder 62, the diameter of the second cylinder 62 is larger than the inner diameter of the holder 4, the diameter of the first cylinder 61 is slightly smaller than the inner diameter of the holder 4, the first cylinder 61 is inserted into the holder 4 to be fixed, the second cylinder 62 is erected on the holder 4, and it can be ensured that the mass block 6 will not fall from the holder 4 all the time in the experimental process. By rotating the turntable 1, the law of conservation of angular momentum when the moment of inertia increases or decreases can be demonstrated as well by extending or retracting the first telescopic rod 3 outwards or inwards.

The scope of the present utility model is not limited to the above-described embodiments, but is intended to be limited to the appended claims, any modifications, equivalents, improvements and alternatives falling within the spirit and principle of the inventive concept, which can be made by those skilled in the art.

Claims (10)

1. The utility model provides an angular momentum conservation law demonstration appearance, its characterized in that, includes carousel (1) and pivot (2), pivot (2) perpendicular to carousel (1) upper surface's center and with carousel (1) rotation is connected, carousel (1) are used for the drive pivot (2) are rotatory around the center of carousel (1) upper surface, the left and right sides symmetry of pivot (2) is provided with first telescopic link (3), the output of first telescopic link (3) is located and keeps away from the one end of pivot (2), two the output of first telescopic link (3) all is connected with holder (4), holder (4) are connected with quality piece (6).

2. The angular momentum conservation law demonstrator of claim 1, characterized in that the first telescopic rod (3) is vertically connected to a side wall of the rotating shaft (2).

3. The angular momentum conservation law demonstrator according to claim 1, characterized in that a second telescopic rod (5) is arranged in the clamp holder (4), the clamp holder (4) clamps the second telescopic rod (5), and the mass block (6) is connected with the output end of the second telescopic rod (5).

4. The demonstration instrument for the law of conservation of angular momentum according to claim 1, wherein the section of the clamp holder (4) is circular, the side wall of the clamp holder (4) is provided with a connecting hole, and a fastener is connected in the connecting hole.

5. The angular momentum conservation law demonstrator according to claim 3, wherein the first telescopic rod (3) and the second telescopic rod (5) are electric push rods, and the turntable (1) is an electric turntable.

6. A demonstrator for conservation law of angular momentum according to claim 3, characterized in that the length direction of the rod body of the second telescopic rod (5) is parallel to the axis of the rotating shaft (2).

7. The angular momentum conservation law demonstrator according to claim 6, wherein the rotating shaft (2) is a hollow cylindrical tube, a power box (7) is arranged at the top of the rotating shaft (2), a rechargeable battery is arranged in the power box (7), and the rechargeable battery is electrically connected with the first telescopic rod (3) and the second telescopic rod (5) through wires penetrating through the rotating shaft (2).

8. The angular momentum conservation law demonstrator of claim 7, characterized in that a charging interface (71) is provided on the surface of the power box (7).

9. The angular momentum conservation law demonstrator of claim 1, characterized in that the mass (6) is a solid iron sphere.

10. The demonstration instrument for the law of conservation of angular momentum according to claim 1, wherein the mass block (6) is a T-shaped cylinder and is formed by coaxially connecting a first cylinder (61) and a second cylinder (62), the diameter of the second cylinder (62) is larger than the inner diameter of the holder (4), the diameter of the first cylinder (61) is smaller than the inner diameter of the holder (4), the first cylinder (61) is inserted into the holder (4) to be fixed, and the second cylinder (62) is erected on the holder (4).