CN212782400U

CN212782400U - Teaching aid for physics simple pendulum experiments

Info

Publication number: CN212782400U
Application number: CN202022039959.XU
Authority: CN
Inventors: 何思齐
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2021-03-23
Anticipated expiration: 2030-09-16

Abstract

The utility model discloses a teaching aid for physical simple pendulum experiments, which comprises a base and a support stand column vertically arranged in the middle of the base, wherein an angle adjusting device is arranged at the upper end of the support stand column; the two adjusting arms of the angle adjusting device are respectively and fixedly connected with a cantilever, an angle graduated scale is further arranged at the upper end of the supporting upright post, and the circle center of the angle graduated scale and the center of the angle adjusting device are on the same straight line; a plurality of hooks are arranged on the cantilever in the extending direction of the cantilever, a traction rope is hung on the hooks, and a traction block is arranged at the lowest end of the traction rope; and the base is also provided with a photoelectric sensor for testing whether the traction block exists or not. The device of the utility model is simple in structure, convenient to use can detect the swing number of times and the angle in the simple pendulum experimentation, and the experimental effect is directly perceived, is favorable to improving teaching experiment work efficiency.

Description

Teaching aid for physics simple pendulum experiments

Technical Field

The utility model relates to a teaching aid for physics simple pendulum experiments belongs to auxiliary teaching aid technical field.

Background

The simple pendulum experiment is an important course of physics teaching in junior high school, and is mainly used for students to deeply understand the relationship between the swing period of the simple pendulum and various factors, such as the relationship between the swing period of the simple pendulum and the swing amplitude; the relationship between the swing period of the simple pendulum and the weight of the pendulum bob; the relationship between the swing period of the simple pendulum and the length of the swing rope.

In the prior art, a teacher usually uses a support when teaching, and then connects a swinging rope on the support, and connects a pendulum bob below the swinging rope.

When the relation between the swing period of the single pendulum and the length of the pendulum rope is researched, the swing amplitude and the weight of the pendulum bob are kept unchanged, namely, when a test is started, one pendulum bob is selected, the pendulum rope is pulled to a certain angle, a teacher/student controls the angle by using a protractor, then the pendulum bob starts to swing freely after the length of the pendulum rope at the moment is recorded, and the swing period is recorded; replacing the swinging rope with different lengths and recording the length of the swinging rope by using the same pendulum bob and the same angle again, or winding the swinging rope on the bracket, measuring the length of the swinging rope again and recording, and starting free swinging again;

similarly, when the relation between the swing period of the simple pendulum and the weight of the pendulum bob is researched, the length and the angle of the swinging rope are not convenient to control, and the pendulum bob with different weights can be changed.

When the relation between the swing period and the swing amplitude of the single pendulum is researched, the length of the swing rope and the pendulum bob are inconvenient to control, and then the angle is measured when the pendulum swings each time, so that the pendulum swings at different amplitudes when the pendulum starts to swing each time.

The experimental device in the prior art is too simple in structure, needs extra protractors and scales to measure the swing amplitude and the length of the scale line when carrying out the simple pendulum experiment at every time, is low in experimental efficiency, is low in measurement precision, and is not beneficial to students to explore the experiment.

Disclosure of Invention

The utility model discloses the purpose is: the utility model provides a teaching aid for physics simple pendulum experiments, its simple structure, convenient to use, the effect is directly perceived, is favorable to improving teaching experiment work efficiency.

The technical scheme of the utility model is that: a teaching aid for a physical simple pendulum experiment comprises a base and a supporting upright post vertically arranged in the middle of the base, wherein an angle adjusting device is arranged at the upper end of the supporting upright post;

two adjusting arms of the angle adjusting device are respectively and fixedly connected with cantilevers, and the cantilevers are arranged in the extending direction of the adjusting arms;

in the process of adjusting the angle adjusting device, the adjusting arm rotates around the center of the angle adjusting device at two sides of the supporting upright post;

the upper end of the supporting upright post is also provided with an angle graduated scale, and the circle center of the angle graduated scale and the center of the angle adjusting device are on the same straight line;

the cantilever and the adjusting arm rotate simultaneously;

a plurality of hooks are arranged on the cantilever in the extending direction of the cantilever, a traction rope is hung on the hooks, and a traction block is arranged at the lowest end of the traction rope;

and the base is also provided with a photoelectric sensor for testing whether the traction block exists or not.

Preferably, the angle adjusting device further comprises a central rotating shaft and a middle gear fixed on the central rotating shaft, wherein outer gears are meshed with two sides of the middle gear, the outer gears are fixedly connected in the cantilever, and the cantilever and the outer gears rotate synchronously.

Preferably, a connecting shaft for connecting the cantilever is arranged in the middle of the outer gear.

Preferably, the hooks are evenly distributed along the extension direction of the cantilever.

Preferably, a track groove is formed in the base, the track groove is arranged along the extending direction of the cantilever, and the photoelectric sensor moves in the track groove.

Preferably, the angle scale is fan-shaped, and the angle measuring range of the angle scale is larger than 180 degrees.

Preferably, a counter is arranged on the base and electrically connected with the photoelectric sensor.

Preferably, a timer is further mounted on the support column.

The utility model has the advantages that: the utility model provides a physics simple pendulum experiment teaching aid, simple structure, easily realization, convenient to use are equipped with the haulage block on the haulage rope, with two couples of arbitrary selection in the both ends of haulage rope and hang freely swing according to gravity behind the couple, through setting up the photoelectric sensor in haulage block below, detect the swing number of times of haulage block swing in-process, by the counter count, the time-recorder timing, indexes such as observation motion (direction, speed) to in time the record.

Simultaneously accessible angle adjusting device adjusts the regulating arm angle, and then adjusts the angle of cantilever, can change the couple height on the cantilever to the comparison of the record of freely droing of the last simple pendulum experiment of co-altitude, the swing range size can be taken notes to the angle scale, and the device has improved teaching experiment work efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

The invention will be further described with reference to the following drawings and examples:

figure 1 is the utility model discloses a teaching aid user state structure schematic diagram for physics simple pendulum experiments.

Fig. 2 is another use state structure diagram of the teaching aid for physics simple pendulum experiments of the utility model.

Fig. 3 is the schematic view of the internal structure of the angle adjusting device connected to the cantilever according to the present invention.

Wherein: 1. a base; 11. a track groove; 2. supporting the upright post; 3. an angle adjusting device; 31. an adjusting arm; 32. a central rotating shaft; 33. a middle gear; 4. a cantilever; 41. hooking; 42. an outer gear; 43. a connecting shaft; 5. an angle scale; 6. a hauling rope; 7. a traction block; 8. a photosensor; 9. a counter; 10. a timer.

Detailed Description

The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present invention. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally the conditions in routine experiments.

Referring to fig. 1 to 3, a teaching aid for physical simple pendulum experiments in a preferred embodiment of the present invention includes a base 1 and a supporting column 2 vertically disposed in the middle of the base 1, wherein an angle adjusting device 3 is disposed at an upper end of the supporting column 2; two adjusting arms 31 of the angle adjusting device 3 are respectively and fixedly connected with a cantilever 4, and the cantilevers 4 are arranged in the extending direction of the adjusting arms 31; the cantilever 4 can then be adjusted by adjusting the angle adjustment device 3.

In the process of adjusting the angle adjusting device 3, the adjusting arm 31 rotates around the center of the angle adjusting device 3 at two sides of the supporting upright 2;

specifically, the upper end of the support upright post 2 is also provided with an angle graduated scale 5, and the circle center of the angle graduated scale 5 and the center of the angle adjusting device 3 are on the same straight line; the 3-cantilever 4 and the adjusting arm 31 rotate simultaneously; a plurality of hooks 41 are arranged on the cantilever 4 in the extending direction, a traction rope 6 is hung on the hooks 41, and a traction block 7 is arranged at the lowest end of the traction rope 6; and the base 1 is also provided with a photoelectric sensor 8 for testing whether the traction block 7 exists or not. Photoelectric sensor 8 sets up under traction block 7, and traction block 7 stops the swing gradually at the swing in-process, and is static under the action of gravity finally, and photoelectric sensor 8 can detect its above traction block 7 of upper side every turn swing to the record.

Two hooks 41 are selected at will at two ends of the traction rope 6 and hung behind the hooks 41, the swinging times of the traction block 7 in the swinging process are detected through a photoelectric sensor 8 arranged below the traction block 7 according to the gravity free swinging of the traction block 7 on the traction rope 6, and the swinging times are recorded in time.

As shown in fig. 3, in the present embodiment, the angle adjusting device 3 further includes a central rotating shaft 32 and a middle gear 33 fixed on the central rotating shaft 32, both sides of the middle gear 33 are engaged with external gears 42, the external gears 42 are both fixedly connected in the suspension arm 4, the suspension arm 4 rotates synchronously with the external gears 42, a connecting shaft 43 connected to the suspension arm 4 is disposed in the middle of the external gears 42, when in use, the central rotating shaft 32 is rotated, the middle gear 33 rotates synchronously with the central rotating shaft 32, so that the external gears 42 engaged on both sides of the middle gear 33 rotate synchronously, and under the action of the external gears 42 and the connecting shaft 43, the external gears 42 rotate, and the suspension arm 4 rotates therewith, thereby achieving an angle adjusting effect of the suspension arm 4.

Because the hooks 41 are uniformly distributed along the extension direction of the cantilever 4, different hooks 41 can be selected for swing experiments during experiments.

After the haulage rope 6 selects 41 positions of different couples, the position of traction block 7 also changes thereupon, for the convenient swing number of times that detects traction block 7 be equipped with track groove 11 on the base 1, track groove 11 along the extending direction setting of cantilever 4, photoelectric sensor 8 is in move in the track groove 11 to can be according to the position adjustment photoelectric sensor 8's of traction block 7 detection position, the flexibility is good, and the experiment is accurate.

Still install timer 9 on the support post 2, be equipped with counter 10 on the base 1, counter 10 with photoelectric sensor 8 electric connection, when experimenting, photoelectric sensor 8 will detect the information feedback to counter 9 of traction block 7 at every turn, by counter 9 record swing number of times, the time of timer 10 observes indexes such as motion (direction, speed), and in time records.

The centre of a circle of angle scale 5 with angle adjusting device 3's center is on same straight line, and angle scale 5 is fan-shaped, and its angular surveying scope is greater than 180, adjusts the angle of cantilever 4 through angle adjusting device 3, changes the 41 heights of couple on the cantilever 4, can carry out the simple pendulum experiment of co-altitude, angle, and simultaneously, usable angle scale 5 can take notes the amplitude of oscillation size, has improved teaching experiment work efficiency.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A teaching aid for a physical simple pendulum experiment is characterized by comprising a base and a supporting upright post vertically arranged in the middle of the base, wherein an angle adjusting device is arranged at the upper end of the supporting upright post;

the cantilever and the adjusting arm rotate simultaneously;

2. A teaching aid for physical simple pendulum experiments according to claim 1, wherein the angle adjusting device further comprises a central rotating shaft and a middle gear fixed on the central rotating shaft, outer gears are meshed with both sides of the middle gear, the outer gears are fixedly connected in the cantilever, and the cantilever and the outer gears rotate synchronously.

3. A teaching aid for a physical simple pendulum experiment according to claim 2, wherein a connecting shaft for connecting the cantilever is arranged in the middle of the outer gear.

4. A teaching aid for a physical simple pendulum experiment as claimed in claim 1, wherein the hooks are evenly distributed along the extension direction of the cantilever.

5. A teaching aid for physical simple pendulum experiments according to claim 1, wherein a rail groove is arranged on the base, the rail groove is arranged along the extending direction of the cantilever, and the photoelectric sensor moves in the rail groove.

6. A teaching aid as claimed in claim 1, wherein the angle scale is fan-shaped and the angle scale has an angle measurement range greater than 180 °.

7. A teaching aid for physical simple pendulum experiments according to claim 1, wherein a counter is arranged on the base, and the counter is electrically connected with the photoelectric sensor.

8. A teaching aid for a physical simple pendulum experiment as claimed in claim 1, wherein a timer is further mounted on the support column.