CN206574337U - A kind of mechanical demonstration teaching aid of lever principle - Google Patents
A kind of mechanical demonstration teaching aid of lever principle Download PDFInfo
- Publication number
- CN206574337U CN206574337U CN201621196488.0U CN201621196488U CN206574337U CN 206574337 U CN206574337 U CN 206574337U CN 201621196488 U CN201621196488 U CN 201621196488U CN 206574337 U CN206574337 U CN 206574337U
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- CN
- China
- Prior art keywords
- expansion link
- cross bar
- column
- teaching aid
- lever principle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a kind of mechanical demonstration teaching aid of lever principle, including cross bar, rotating shaft, column, dynamometer, spring, base, counterweight, hook, expansion link, external screw thread and internal thread, the rotating shaft is fixedly installed in the top side of column, the cross bar is connected by rotating shaft with column, the column is fixedly installed in the top of base, internal thread is provided with the inner chamber of the cross bar, the outside of the expansion link is provided with external screw thread, the expansion link is connected with cross bar, the spring is fixedly installed in the top of base, the top of the spring is connected with dynamometer, the dynamometer is fixedly installed in the bottom of cross bar, the two ends bottom of the expansion link is provided with hook, the hook is provided with counterweight.Lever principle machinery demonstration teaching aid can not only verify " power × power arm=resistance × resistance arm " this formula, can also demonstrate gravitional force and the conversion of elastic potential energy each other, be conducive to student to draw inferences about other cases from one instance, deepen the impression of student.
Description
Technical field
The utility model is related to teaching aid technical field, specially a kind of mechanical demonstration teaching aid of lever principle.
Background technology
Physics is the important step in an experimental science, laboratory physics teaching, is both the content of study, is study again
Method.Teaching aid is the material base of experiment, and without teaching aid, our experiment is just into cooking a meal without rice, and experimental exploring will become
Cheng teacher tests in blackboard, student's back of the body experiment, examines experiment on paper, does not as a result improve students ' quality.
Lever principle is one of important principle in physics, in physics teaching, and demonstration lever principle can allow student more
Plus the understanding lever rule of image.Teacher is typically all understood do not have when explaining lever principle to student by picture
Actual teaching aid is demonstrated to student viewing, or is simulated using light instrument, and such teacher can not accurately load lever two ends
Quality, position of the fulcrum can not be accurately positioned, can only by virtue of experience with feel carry out lever principle simulation, have some students reason
Solve not thorough, the knowledge learned is not sturdy, has a strong impact on the understanding and grasp of later physical knowledge.Therefore, it is necessary to provide
A kind of lever used for physics teaching, visual expression lever principle in kind can be used when teacher gives lessons, while also allowing the memory of student deep
Carve, improve efficiency of teaching.
Utility model content
The purpose of this utility model is to provide a kind of lever principle mechanical demonstration teaching aid, to solve in above-mentioned background technology
The existing lever principle demonstration teaching aid proposed is excessively simple, the problem of effect for teaching demonstration is poor.
To achieve the above object, the utility model provides following technical scheme：A kind of mechanical demonstration teaching aid of lever principle, bag
Cross bar, rotating shaft, column, dynamometer, spring, base, counterweight, hook, expansion link, external screw thread and internal thread are included, the rotating shaft is consolidated
Dingan County is loaded on the top side of column, and the cross bar is connected by rotating shaft with column, and the column is fixedly installed in the top of base,
Internal thread is provided with the inner chamber of the cross bar, the outside of the expansion link is provided with external screw thread, and the expansion link is connected with cross bar,
The spring is fixedly installed in the top of base, and the top of the spring is connected with dynamometer, and the dynamometer is fixedly mounted
In the bottom of cross bar, the two ends bottom of the expansion link is provided with hook, and the hook is provided with counterweight.
It is preferred that, it is connected between the expansion link and cross bar by screw thread.
It is preferred that, the expansion link is retractable adjusting device, and the Extensible scope of expansion link is 0-15cm.
It is preferred that, the expansion link is provided with scale.
It is preferred that, the spring of the column both sides is symmetrical arranged centered on column.
Compared with prior art, the beneficial effects of the utility model are：The expansion link of lever principle machinery demonstration teaching aid
It is connected between cross bar by screw thread, the size of the arm of force can be adjusted by the length of adjustable telescopic rod, and by changing
The weight of counterweight changes the size of power on hook, and the both sides of column are arranged with spring and dynamometer, can by dynamometer come
The size of force value is observed, " power × power arm=resistance × resistance arm " this formula can be not only verified, weight can also be demonstrated
Power potential energy and the conversion of elastic potential energy each other, are conducive to student to draw inferences about other cases from one instance, in presentation process, student oneself can lead to
The length of the arm of force and the weight of weight are overregulated, it is simple in construction compared to traditional to observe the change of numerical value on dynamometer
Demonstration teaching aid, has tempered the manipulative ability of student, adds the interest of study, has deepened the impression of student.
Brief description of the drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is the fractionation structural representation of the utility model expansion link and cross bar.
In figure：1st, cross bar, 2, rotating shaft, 3, column, 4, dynamometer, 5, spring, 6, base, 7, counterweight, 8, hook, 9, flexible
Bar, 10, external screw thread, 11, internal thread.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
Fig. 1-2 is referred to, the utility model provides a kind of technical scheme：A kind of mechanical demonstration teaching aid of lever principle, including
Cross bar 1, rotating shaft 2, column 3, dynamometer 4, spring 5, base 6, counterweight 7, hook 8, expansion link 9, external screw thread 10 and internal thread 11,
Rotating shaft 2 is fixedly installed in the top side of column 3, and cross bar 1 is connected by rotating shaft 2 with column 3, makes cross bar 1 can be according to two ends power
Change is freely rotated centered on rotating shaft 2, and column 3, which is fixedly installed in the top of base 6, the inner chamber of cross bar 1, is provided with internal thread
11, the outside of expansion link 9 is provided with external screw thread 10, and expansion link 9 is connected with cross bar 1, and screw thread is passed through between expansion link 9 and cross bar 1
It is connected, expansion link 9 is retractable adjusting device, and the Extensible scope of expansion link 9 is 0-15cm, can be stretched by regulation
The length of contracting bar 9 changes the length of the arm of force, and expansion link 9 is provided with scale, the length flexible to record expansion link 9, spring 5
The top of base 6 is fixedly installed in, the spring 5 of the both sides of column 3 is symmetrical arranged centered on column 3, the top of spring 5 and dynamometry
Device 4 is connected, and dynamometer 4 is fixedly installed in the bottom of cross bar 1, can easily observe the size for the power being applied on spring 5, stretch
The two ends bottom of contracting bar 9 is provided with counterweight 7 provided with hook 8, hook 8, and power is changed by increasing and reducing the weight of counterweight 7
Size.
Operation principle：Before being demonstrated using the mechanical demonstration teaching aid of the lever principle, cross bar 1 is in horizontal shape
State, during demonstration, can change the size of power by the weight for increasing and reducing counterweight 7, screw thread is passed through between expansion link 9 and cross bar 1
It is connected, expansion link 9 is retractable adjusting device, and the Extensible scope of expansion link 9 is 0-15cm, can be stretched by regulation
The length of contracting bar 9 changes the length of the arm of force, and expansion link 9 is provided with scale, the length flexible to record expansion link 9, now,
Lever principle is verified using formula " power × power arm=resistance × resistance arm " according to the data of record, increased
When few 7 weight of counterweight that adds deduct, due to the change of power, cause the elongation or compression of spring 5, demonstrate gravitional force and bullet
The conversion of property potential energy each other.
Although the utility model is described in detail with reference to the foregoing embodiments, come for those skilled in the art
Say, it can still be modified to the technical scheme described in foregoing embodiments, or which part technical characteristic is entered
Row equivalent substitution, all within spirit of the present utility model and principle, any modification, equivalent substitution and improvements made etc. all should
Within protection domain of the present utility model.
Claims (5)
1. a kind of mechanical demonstration teaching aid of lever principle, including cross bar (1), rotating shaft (2), column (3), dynamometer (4), spring (5),
Base (6), counterweight (7), hook (8), expansion link (9), external screw thread (10) and internal thread (11), it is characterised in that：The rotating shaft
(2) top side of column (3) is fixedly installed in, the cross bar (1) is connected by rotating shaft (2) with column (3), the column (3)
It is fixedly installed in the top of base (6), the inner chamber of the cross bar (1) and is provided with internal thread (11), the outside of the expansion link (9)
Provided with external screw thread (10), the expansion link (9) is connected with cross bar (1), and the spring (5) is fixedly installed in the top of base (6)
Portion, the top of the spring (5) is connected with dynamometer (4), and the dynamometer (4) is fixedly installed in the bottom of cross bar (1), institute
The two ends bottom of expansion link (9) is stated provided with hook (8), the hook (8) is provided with counterweight (7).
2. the mechanical demonstration teaching aid of a kind of lever principle according to claim 1, it is characterised in that：The expansion link (9) with
Cross bar is connected between (1) by screw thread.
3. the mechanical demonstration teaching aid of a kind of lever principle according to claim 1, it is characterised in that：The expansion link (9) is
Retractable adjusting device, and the Extensible scope of expansion link (9) is 0-15cm.
4. the mechanical demonstration teaching aid of a kind of lever principle according to claim 1, it is characterised in that：On the expansion link (9)
Provided with scale.
5. the mechanical demonstration teaching aid of a kind of lever principle according to claim 1, it is characterised in that：Column (3) both sides
Spring (5) be symmetrical arranged centered on column (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621196488.0U CN206574337U (en) | 2016-10-31 | 2016-10-31 | A kind of mechanical demonstration teaching aid of lever principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621196488.0U CN206574337U (en) | 2016-10-31 | 2016-10-31 | A kind of mechanical demonstration teaching aid of lever principle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206574337U true CN206574337U (en) | 2017-10-20 |
Family
ID=60062906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621196488.0U Expired - Fee Related CN206574337U (en) | 2016-10-31 | 2016-10-31 | A kind of mechanical demonstration teaching aid of lever principle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206574337U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593179A (en) * | 2018-06-26 | 2018-09-28 | 王宏伟 | A kind of physics teaching spring force tester |
| CN110641731A (en) * | 2019-09-29 | 2020-01-03 | 江苏科技大学 | Rotor motor lift force measuring device for multi-rotor unmanned aerial vehicle |
-
2016
- 2016-10-31 CN CN201621196488.0U patent/CN206574337U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593179A (en) * | 2018-06-26 | 2018-09-28 | 王宏伟 | A kind of physics teaching spring force tester |
| CN110641731A (en) * | 2019-09-29 | 2020-01-03 | 江苏科技大学 | Rotor motor lift force measuring device for multi-rotor unmanned aerial vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171020 Termination date: 20191031 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |