CN109637302A - A kind of physics inertia experimental demonstration device - Google Patents
A kind of physics inertia experimental demonstration device Download PDFInfo
- Publication number
- CN109637302A CN109637302A CN201910139715.8A CN201910139715A CN109637302A CN 109637302 A CN109637302 A CN 109637302A CN 201910139715 A CN201910139715 A CN 201910139715A CN 109637302 A CN109637302 A CN 109637302A
- Authority
- CN
- China
- Prior art keywords
- gear
- sphere
- pull plate
- driving
- bevel gear
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/08—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
- G09B23/10—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of solid bodies
Landscapes
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Algebra (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Physics (AREA)
- Computational Mathematics (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- Theoretical Computer Science (AREA)
- Toys (AREA)
- Gear Transmission (AREA)
Abstract
The invention discloses a kind of physics inertia experimental demonstration devices, belong to instructional device field.The device includes: pedestal；Experimental provision comprising driving gear, driving device, the first linkage gear, the second linkage gear, the first pull plate, the second pull plate and admission extinguisher for driving sliding tooth wheel to rotate, the number of teeth of the second linkage gear are greater than the number of teeth of the first linkage gear；First pull plate is fixedly attached to the first linkage gear, the second pull plate is fixedly attached to the second linkage gear；First sphere；Second sphere, diameter is identical as the first sphere, and quality is greater than the first sphere；Third sphere, diameter is identical as the first sphere, and quality is greater than the second sphere；First track, positioned at the side of driving gear；Second track, positioned at the other side of driving gear.The present invention can demonstrate the quality of inertia and object in relation to this knowledge point, while unrelated with speed convenient for explanation inertia, and with quality in relation to this knowledge point.
Description
Technical field
The present invention relates to instructional device field, in particular to a kind of physics inertia experimental demonstration device.
Background technique
In physics facility, especially in experimental provision used in the demonstration law of inertia, it is fixed often to demonstrate inertia
Rule i.e. the newton first law of motion.It is known that the newton first law of motion, the abbreviation forst law of motion.It is also known as used
Property law, inertia law.Common complete expression: any object will remain a constant speed linear motion or stationary state, until outer
Until power forces it to change motion state.Statement in Shandong religion version high school physics textbook is: the forst law of motion shows outer when closing
When power is zero, originally static object will continue to remain stationary state, and the object moved originally will then continue with original speed
Do linear uniform motion.It includes two kinds of situations that bonding force, which is zero: all external force being subject to one is object are cancelled out each other, bonding force
It is zero；Another kind is object not by the effect of external force.Some experts and scholars think that this form of presentation is not rigorous, so usually
Using original statement.Galileo thinks the inference of smooth bevel, in reality, when a ball rolls downwards along inclined-plane, and its speed
When spending and increase, and scrolling up, its speed reduces.Thus Galileo inference, when ball rolls along the horizontal plane, its speed should not
Increasing does not subtract.Actually he has found that ball is more and more slow, finally stops.Galileo thinks that this is not its " nature ",
But due to the reason of frictional resistance, because he is equally also observed, surface is more smooth, and ball will roll remoter.Then he pushes away
By if ball will roll down forever without frictional resistance.
The experiment of Galilean ideal slope is to allow bead lower rolling since stationary state along a smooth bevel, and bead will
Another inclined-plane is rolled on, is reached and the then lower rolling again of original much the same height.His inference, for no other reason than that frictional force, ball does not just have
Original height can be reached.Then, he reduces the inclination angle on latter inclined-plane, and bead still reaches sustained height on this inclined-plane, but
At this moment it will roll far.Continue the inclination angle on second inclined-plane of reduction, ball, which reaches sustained height, will roll farther.Then he is right
The case where when inclined-plane is laid flat, is studied, and conclusion is clearly that ball will roll down forever.This is to say, power is not the fortune for maintaining object
The reason of dynamic speed for maintaining object, and exactly change the reason of object moving state changes object speed.Therefore, one
There is denier object a certain speed will just be moved down if it does not stress with this speed uniform rectilinear.1687, newton
On the basis of Descartes, Galileo et al. work, " Philosophiae naturalis principia mathematica " is write, the constraint of outdated ideas is got rid of,
The law of inertia is formally contemplated as First Principle: all objects always keep linear uniform motion state or stationary state, remove
Until the non-active external force on it forces it to change this state.He proposes the linear motion state and static of remaining a constant speed
State is the viewpoint of the build-in attribute of object, and the concept of the inertial reference system therefrom obtained.
The existing demonstration teaching aid about inertia is mostly that demonstration is realized by single structure.Generally mostly use bead
It is placed on paper, by quickly extracting to paper, bead falls rather than designs demonstration with the principle that paper moves together
Teaching aid.When this demonstration mode can demonstrate object and remain static originally, can also have the stationary state for keeping original
Characteristic.But since its structure is single, single state can only be demonstrated.And for inertia, it is that one kind of object is solid
There is the movement velocity of attribute and object unrelated related with quality.Quality is bigger, and inertia is bigger.Explanation for this knowledge point
When, due to lacking effective teaching aid, student's often indigestion.In addition the object that above-mentioned demonstration mode can not also demonstrate movement exists
In the case of not by external force, there is the attribute for the motion state for keeping original.
Summary of the invention
The present invention provides a kind of physics inertia experimental demonstration device, can solve inertia experimental demonstration dress in the prior art
Set the problem that demonstrating effect is single, poor for the demonstrating effect of inertial properties.
A kind of physics inertia experimental demonstration device, comprising:
Pedestal；
Experimental provision comprising driving gear, the driving device for driving the sliding tooth wheel rotation, the first linkage tooth
Wheel, the second linkage gear, the first pull plate, the second pull plate and admission extinguisher, first linkage gear and second linkage
Gear is located at the two sides of the driving gear, and the number of teeth of second linkage gear is greater than the number of teeth of first linkage gear,
When the sliding tooth wheel rotates, first linkage gear and second linkage gear rotation are driven；
Described in first pull plate is fixedly attached to first linkage gear, second pull plate is fixedly attached to
Second linkage gear, the admission extinguisher are located at the lower section of first pull plate and second pull plate；
First sphere；
Second sphere, diameter is identical as the first sphere, and quality is greater than the first sphere；
Third sphere, diameter is identical as the first sphere, and quality is greater than the second sphere；
First sphere, second sphere and the third sphere arranged from the distant to the near apart from the driving gear and
On the extension line of the radius of same driving gear；
First track, positioned at the side of the driving gear, when first pull plate rotates, with the first track phase
Docking；
Second track, positioned at the other side of the driving gear, when second pull plate rotates, with second track
It is connected to each other.
More preferably, further include block, the driving device include setting support on the base, first bevel gear,
Second bevel gear, rocking bar and torsional spring, the first bevel gear are co-axially located on the driving gear, and the second bevel gear can
It is rotatably arranged on the support, the first bevel gear is meshed with the second bevel gear, the rocking bar fixed setting
In the second bevel gear, for driving the second bevel gear to rotate, set between the second bevel gear and the support
It is equipped with torsional spring；The block is located on the pedestal, for limiting the position of the rocking bar.
More preferably, it is coaxially arranged with drive shaft below the driving gear, the first bevel gear is co-axially located at institute
It states in drive shaft, universal driving shaft is coaxially arranged in the second bevel gear, the universal driving shaft is rotatably arranged in the support
On.
More preferably, the second bevel gear is part bevel gear.
More preferably, the surface of first pull plate, second pull plate, first track and second track
It is coated with polytetrafluorethylecoatings coatings.
The present invention provides a kind of physics inertia experimental demonstration device, passes through setting for the first linkage gear and the second linkage gear
It sets, may be implemented to rotate to the first pull plate and the second pull plate while at different rates to realize, the second linkage gear tooth
Number is more, therefore its velocity of rotation is slower, and the first linkage gear number of teeth is less, and velocity of rotation is very fast, realizes comparison reference
Experiment, since the quality of the first sphere, the second sphere and third sphere is different, the first pull plate is in the first linkage gear
When driving lower realization pull, since the inertia of the first sphere, the second sphere and third sphere is different, passes through and different revolving speeds is set
The biggish ball of quality of presentation can be realized to fall since inertia is larger, and the lesser ball of quality drives since inertia is smaller,
To demonstrate the quality of inertia and object in relation to this knowledge point, and the second pull plate velocity of rotation is slower, on the second pull plate
Three spheres it is mobile with identical speed, when being moved to the second orbital docking, the second pull plate stops, three spheres
It can be moved along the second track and speed is identical, since the big moving distance of quality is remote, thus it is unrelated with speed conducive to explanation inertia,
And with quality in relation to this knowledge point.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of physics inertia experimental demonstration device provided by the invention；
Fig. 2 is partial enlarged view at A in Fig. 1；
Fig. 3 is a kind of working state schematic representation of physics inertia experimental demonstration device provided by the invention；
Fig. 4 is the structural schematic diagram of driving device in Fig. 1.
Description of symbols:
10, driving gear, 101, drive shaft, the 11, first linkage gear, the 12, second linkage gear, the 13, first pull plate,
14, the second pull plate, 15, admission extinguisher, the 16, first sphere, the 17, second sphere, 18, third sphere, the 19, first track, 191,
Second track, 20, support, 21, rocking bar, 22, block, 23, first bevel gear, 24, second bevel gear.
Specific embodiment
With reference to the accompanying drawing, the specific embodiment of the present invention is described in detail, it is to be understood that of the invention
Protection scope be not limited by the specific implementation.
As shown in Figures 1 to 4, a kind of physics inertia experimental demonstration device provided in an embodiment of the present invention, comprising:
Pedestal；
Experimental provision comprising driving gear 10, the driving device for driving the driving gear 10 to rotate, first
Moving gear 11, the second linkage gear 12, the first pull plate 13, the second pull plate 14 and admission extinguisher 15, first linkage gear
11 and second linkage gear 12 be located at the two sides of the driving gear 10, be symmetrical arranged about driving gear 10, described the
The number of teeth of two linkage gears 12 is greater than the number of teeth of first linkage gear 11, when the driving gear 10 rotates, described in drive
First linkage gear 11 and second linkage gear 12 rotation, driving gear 10, the first linkage gear 11 and the second linkage tooth
Wheel 12 is rotatably arranged on pedestal by shaft；
As shown in Figure 1, first pull plate 13 is fixedly attached to first linkage gear 11, second pull plate
14 are fixedly attached to second linkage gear 12, and the first pull plate 13 is connected to the first linkage gear by the first connecting plate
11, the second pull plate 14 is connected to the second linkage gear 12 by the second connecting plate, as shown in Fig. 2, the admission extinguisher 15 is located at
The lower section of first pull plate 13 and second pull plate 14, for collecting the first sphere 16, the second sphere 17 and/or the
Three spheres 18；The first sphere 16, the second sphere 17 and third sphere are placed on first pull plate 13 and the second pull plate 14
18, the second sphere 17, diameter is identical as the first sphere 16, and quality is greater than the first sphere 16；Third sphere 18, diameter and
One sphere 16 is identical, and quality is greater than the second sphere 17；First sphere 16, second sphere 17 and the third sphere 18
It is arranged from the distant to the near apart from the driving gear 10, the first sphere 16, the second sphere 17 and third sphere 18 are located at driving gear
It, can be to avoid due to ball when so as to the first pull plate 13 and the rotation of the second pull plate 14 on the extension line of 10 same radius
The difference of placement location, on the contrary forms experimental error；
First track 19, positioned at the side of the driving gear 10, when first pull plate 13 rotates, described first is taken out
The first support plate on pulling plate 13 is connected to each other with first track 19, the extending direction of the first track 19 and the first pull plate 13
Rotary motion trace it is tangent；
Second track 191, positioned at the other side of the driving gear 10, when second pull plate 14 rotates, described the
The first support plate on two pull plates 14 is connected to each other with second track 191, the extending direction and the one or two of the second track 191
The rotary motion trace of pull plate is tangent.
When experiment, according to the good velocity of rotation of the Quality Design of the first sphere 16, the second sphere 17 and third sphere 18, driving
Gear 10 can be driven by motor, and motor is preferably servo motor, to facilitate adjustment revolving speed.Due to the first linkage gear 11
The number of teeth is less than the number of teeth of the second linkage gear 12, therefore when gear 10 being driven to rotate, the revolving speed of the first linkage gear 11 is greater than the
First sphere 16, the second sphere 17 and third sphere 18 are placed sequentially in the first support plate, by the revolving speed of two linkage gears 12
In two support plates and third support plate, if Fig. 2 is arranged, when rotation, makes that gear 10 is driven to rotate clockwise, and drives the first linkage tooth
Wheel 11 rotates counterclockwise, since the quality of the first sphere 16, the second sphere 17 and third sphere 18 is different, 13 He of the first pull plate
When second pull plate 14 rotates, when the first pull plate 13 rotates, 16 mass of the first sphere is most light, and inertia is smaller when rotating,
Keep the ability of original stationary state smaller, can be mobile with the first pull plate 13, and 17 mass of the second sphere is taken second place, it can be with
The mobile a distance of the first pull plate 13 can just fall, 18 mass of third sphere is maximum, can almost keep original position to fall
It falls, student is facilitated to understand the size of inertia with quality in relation to this knowledge point.And on the second pull plate 14, due to the second pull plate
14 velocities of rotation are slower, and the first sphere 16, the second sphere 17 and third sphere 18 can be rotated with the second pull plate 14, when
When two pull plates 14 turn to the second track, the second pull plate 14 and the second track are hit, at this time the first sphere 16, the second sphere
17 and third sphere 18 there is initial velocity, therefore three spheres can be slided along the second track 191, and due to its initial velocity
Identical, quality is different, and maximum 18 moving distance of third sphere of quality is farthest, and the second sphere 17 takes second place, and third sphere 18 is mobile
Speed is most short, therefore can understand in order to student, and the size and speed of inertia are unrelated, and with quality in relation to this knowledge point.
In order to simplify device, manufacture easy to produce reduces cost, as shown in figure 4, the present embodiment further includes block 22,
The driving device includes support 20, first bevel gear 23, second bevel gear 24, rocking bar 21 and the torsion of setting on the base
Spring, the first bevel gear 23 are co-axially located on the driving gear 10, and the second bevel gear 24 is rotatably arranged in
On the support 20, the first bevel gear 23 is meshed with the second bevel gear 24, and the rocking bar 21 is fixed at institute
State in second bevel gear 24, for driving the second bevel gear 24 to rotate, the second bevel gear 24 and the support 20 it
Between be provided with torsional spring；The block 22 is located on the pedestal, for limiting the position of the rocking bar 21.In use, manpower turns
Shake bar 21, makes rocking bar 21 far from block 22, the first pull plate 13 and the second pull plate 14 can move during this, because these shake
It is static to the first pull plate 13 and the second pull plate 14 when bar 21 turns to predeterminated position, then by the first sphere 16, the second sphere
17 and third sphere 18 be placed on the first pull plate 13 and the second pull plate 14, then unclamp hand, second bevel gear 24 is being turned round
It is rotated under the drive of spring, second bevel gear 24 drives first bevel gear 23 to rotate, and first bevel gear 23 drives 10 turns of gear of driving
Dynamic, subsequent motion process is same as above.
Specifically, the lower section of the driving gear 10 is coaxially arranged with drive shaft 101, and the first bevel gear 23 is coaxially set
It sets in the drive shaft 101, universal driving shaft is coaxially arranged in the second bevel gear 24, the universal driving shaft can be rotatably set
On the support 20.
Due to the homing action of torsional spring be it is fixed, the acceleration that second bevel gear 24 rotates is smaller and smaller but speed is got over
Come it is bigger, therefore when second gear have certain time idle stroke engaged again with first bevel gear 23 when speed it is larger, because
Second bevel gear 24 is part bevel gear by this, and when rotating rocker 21, rocking bar 21 drives second bevel gear 24 to rotate, and the second cone
Gear 24 with first bevel gear 23 due to that in rotation process, can be separated, second bevel gear 24 exists for part bevel gear
Unclamp rocking bar 21 after, under the action of torsional spring generate reset when, first can idle stroke for a period of time, then just with first bevel gear 23
It is meshed, speed is very fast when so engaging, and the impact of generation is larger, so that the initial speed of driving gear 10 is larger.
In order to reduce frictional force, first pull plate 13, second pull plate 14, first track 19 and described
The surface of second track 191 is coated with polytetrafluorethylecoatings coatings.
Disclosed above is only several specific embodiments of the invention, and still, the embodiment of the present invention is not limited to this, is appointed
What what those skilled in the art can think variation should all fall into protection scope of the present invention.
Claims (5)
1. a kind of physics inertia experimental demonstration device characterized by comprising
Pedestal；
Experimental provision comprising driving gear, the driving device for driving sliding tooth wheel rotation, the first linkage gear,
Second linkage gear, the first pull plate, the second pull plate and admission extinguisher, first linkage gear and second linkage gear
Positioned at the two sides of the driving gear, the number of teeth of second linkage gear is greater than the number of teeth of first linkage gear, described
When sliding tooth wheel rotates, first linkage gear and second linkage gear rotation are driven；
First pull plate is fixedly attached to first linkage gear, second pull plate is fixedly attached to described second
Linkage gear, the admission extinguisher are located at the lower section of first pull plate and second pull plate；
First sphere；
Second sphere, diameter is identical as the first sphere, and quality is greater than the first sphere；
Third sphere, diameter is identical as the first sphere, and quality is greater than the second sphere；
First sphere, second sphere and the third sphere are arranged and are located at from the distant to the near apart from the driving gear
Same drives on the extension line of the radius of gear；
First track is opposite with first track when first pull plate rotates positioned at the side of the driving gear
It connects；
Second track is opposite with second track when second pull plate rotates positioned at the other side of the driving gear
It connects.
2. a kind of physics inertia experimental demonstration device as described in claim 1, which is characterized in that it further include block, the drive
Dynamic device includes support, first bevel gear, second bevel gear, rocking bar and the torsional spring of setting on the base, first cone
Gear is co-axially located on the driving gear, and the second bevel gear is rotatably arranged on the support, and described first
Bevel gear is meshed with the second bevel gear, and the rocking bar is fixed in the second bevel gear, described for driving
Second bevel gear rotation, is provided with torsional spring between the second bevel gear and the support；The block is located on the pedestal,
For limiting the position of the rocking bar.
3. a kind of physics inertia experimental demonstration device as claimed in claim 2, which is characterized in that the lower section of the driving gear
It is coaxially arranged with drive shaft, the first bevel gear is co-axially located in the drive shaft, is coaxially set in the second bevel gear
It is equipped with universal driving shaft, the universal driving shaft is rotatably arranged on the support.
4. a kind of physics inertia experimental demonstration device as claimed in claim 2, which is characterized in that the second bevel gear is portion
Reference cone gear.
5. a kind of physics inertia experimental demonstration device as claimed in claim 2, which is characterized in that first pull plate, institute
The surface for stating the second pull plate, first track and second track is coated with polytetrafluorethylecoatings coatings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910139715.8A CN109637302B (en) | 2019-02-17 | 2019-02-17 | Physical inertia experiment demonstration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910139715.8A CN109637302B (en) | 2019-02-17 | 2019-02-17 | Physical inertia experiment demonstration device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109637302A true CN109637302A (en) | 2019-04-16 |
| CN109637302B CN109637302B (en) | 2020-09-04 |
Family
ID=66066081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910139715.8A Expired - Fee Related CN109637302B (en) | 2019-02-17 | 2019-02-17 | Physical inertia experiment demonstration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109637302B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201035795Y (en) * | 2007-03-15 | 2008-03-12 | 上海市嘉定区第二中学 | Testing apparatus of demonstrating inertia phenomenon of passenger |
| CN203026010U (en) * | 2013-01-15 | 2013-06-26 | 张依才 | Inertia demonstration teaching aid |
| CN104346977B (en) * | 2014-08-19 | 2016-12-07 | 浙江工业大学 | Rotary inertia teaching aid instrument |
| CN205867491U (en) * | 2016-07-29 | 2017-01-11 | 江苏华明科教设备有限公司 | Batting device |
| CN206524064U (en) * | 2017-01-22 | 2017-09-26 | 陈心怡 | A kind of inertia demonstration teaching aid |
| CN207302428U (en) * | 2017-07-06 | 2018-05-01 | 秦善天 | A kind of inertia demonstration teaching aid |
| US20180221711A1 (en) * | 2017-02-06 | 2018-08-09 | Seiko Epson Corporation | Motion analysis method and display method |
-
2019
- 2019-02-17 CN CN201910139715.8A patent/CN109637302B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201035795Y (en) * | 2007-03-15 | 2008-03-12 | 上海市嘉定区第二中学 | Testing apparatus of demonstrating inertia phenomenon of passenger |
| CN203026010U (en) * | 2013-01-15 | 2013-06-26 | 张依才 | Inertia demonstration teaching aid |
| CN104346977B (en) * | 2014-08-19 | 2016-12-07 | 浙江工业大学 | Rotary inertia teaching aid instrument |
| CN205867491U (en) * | 2016-07-29 | 2017-01-11 | 江苏华明科教设备有限公司 | Batting device |
| CN206524064U (en) * | 2017-01-22 | 2017-09-26 | 陈心怡 | A kind of inertia demonstration teaching aid |
| US20180221711A1 (en) * | 2017-02-06 | 2018-08-09 | Seiko Epson Corporation | Motion analysis method and display method |
| CN207302428U (en) * | 2017-07-06 | 2018-05-01 | 秦善天 | A kind of inertia demonstration teaching aid |
Non-Patent Citations (2)
| Title |
|---|
| 王溢然: "一个惯性实验的分析", 《物理教师》 * |
| 高传刚: "弹球式惯性小车", 《中小学实验与装备》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109637302B (en) | 2020-09-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wilson | The Venus–Earth–Jupiter spin–orbit coupling model | |
| CN109637302A (en) | A kind of physics inertia experimental demonstration device | |
| CN104192324A (en) | Swing-arm-type rotating synchronous space three-dimensional simulator | |
| CN207571969U (en) | A kind of double drive formula day the moon celestial body simulation motion demonstrating instrument | |
| CN204790322U (en) | Suspension tourbillon structure of mechanical watch | |
| CN202003585U (en) | Lathe transmission model | |
| CN106224189A (en) | A kind of swing TRT of two directions' inputing Unidirectional output mechanism | |
| CN102233583A (en) | Rack connecting rod type two-degree-of-freedom thumb root joint device | |
| CN201205441Y (en) | Rail control mechanism in badminton training machine | |
| CN204915012U (en) | Many dustless electronic blanks | |
| CN104167144B (en) | Mechanical tower demonstrates mechanism | |
| CN101598926A (en) | A kind of planet circular system of double-tourbillion mechanical watch | |
| US6601471B2 (en) | Main block of drop-power station | |
| CN207134038U (en) | A kind of cam rocker arm on mechanical teaching aid tolls a bell mechanism | |
| CN209158449U (en) | A kind of mechanical arm for experimental teaching | |
| CN105443335B (en) | For collecting the energy drawing device of vibrational energy | |
| CN205881202U (en) | Be used for english teaching aid | |
| CN105197121B (en) | A kind of multiple degrees of freedom bio-mechanism | |
| CN104537932A (en) | Presentation device for theorem of moment of momentum | |
| CN208342855U (en) | A kind of mechanical arm of simulation shooting | |
| CN108510848B (en) | A kind of apparatus and method of several basic contents of demonstration rotation rigid body | |
| Mungan | In defense of derivations | |
| Mungan | in my opinion | |
| CN108346355B (en) | Object law of conservation of mechanical energy demonstrator | |
| CN113035028B (en) | Parabola demonstration device based on parabola principle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200904 Termination date: 20210217 |