CN108062905A - A kind of synthesis of mechanism demonstration teaching aid - Google Patents
A kind of synthesis of mechanism demonstration teaching aid Download PDFInfo
- Publication number
- CN108062905A CN108062905A CN201810080586.5A CN201810080586A CN108062905A CN 108062905 A CN108062905 A CN 108062905A CN 201810080586 A CN201810080586 A CN 201810080586A CN 108062905 A CN108062905 A CN 108062905A
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- gear
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- connecting rod
- eccentric disc
- riser
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- 230000007246 mechanism Effects 0.000 title claims abstract description 80
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 15
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 230000033001 locomotion Effects 0.000 abstract description 24
- 230000000007 visual effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
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- 230000007812 deficiency Effects 0.000 description 1
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- 239000004744 fabric Substances 0.000 description 1
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Classifications
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- 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
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/02—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of industrial processes; of machinery
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- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Physics & Mathematics (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Transmission Devices (AREA)
- Toys (AREA)
Abstract
The invention discloses a kind of synthesis of mechanism demonstration teaching aid, which includes riser, bottom plate, corner brace, crank, bearing, transmission shaft, gear mechanism, cam mechanism and linkage.Eccentric disc is cam mechanism and the driving unit of linkage.Cam mechanism includes swing rod and resetting spring.Linkage includes connecting rod a, connecting rod b, axis pin a, axis pin b and axis pin c.Crank is rotated, rotates transmission of the crank by transmission shaft and gear mechanism, eccentric disc is driven, and then observes the characteristics of motion of swing rod, by resetting spring, swing rod can be contacted with eccentric disc higher pair.Due to the movement of eccentric disc, by changing the position of axis pin a, axis pin b and axis pin c, linkage not of the same race can be obtained, is able to observe that the characteristics of motion not of the same race of connecting rod b.The learning interest that the present invention makes to have cultivated student by visual illustration, improves Classroom Teaching, has reached preferable teaching purpose.
Description
Technical field
The present invention relates to a kind of teaching aids, are demonstrated suitable for the synthesis of mechanism intuitive of Fundamentals of Machine Design, by this
Teaching aid, concept, quickreturn characteristics concept, dead point concept and the various mechanism synthesis and motor of energy visual illustration low pairs replacing high pair
Reason.
Background technology
With the demand to innovation personnel training under the propulsion and adaptation new model of the reform of university media Enterprise Education, class
Hall education must change previous that implantation of weight knowledge, teaching pattern of light ability of creative culture.And mechanical speciality is made
Based on one of specialty, many course contents closely, improve the one of Students ' Innovative Thinking Ability all with the actual contact of engineering
A effective way is exactly classroom mock-up demonstration.It contacts, but also has very strong in this way, not only being established with the knowwhy in course
It is novel to feel this for intuitive, students' union, and teaching efficiency can be more preferable.
However, a backbone technology basic course of the Fundamentals of Machine Design as mechanical speciality, most schools use
Multimedia mode is imparted knowledge to students, in the course, the concept of low pairs replacing high pair, the concept of quickreturn characteristics, the concept at dead point and a variety of machines
Structure synthesis and motion principle, because relatively more abstract, if only by conceptual understanding, be easy to cause student and are difficult to understand for.
It therefore, can be more deep intuitively by a kind of observation, operation and the comparison of synthesis of mechanism demonstration teaching aid on classroom
Understanding the content of course is particularly important.
The content of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of synthesis of mechanism demonstration teaching aid.The teaching aid structure is simple, dress
With conveniently, a model can not only demonstrate the concept of low pairs replacing high pair, the concept of the concept of quickreturn characteristics and dead point but also can observe
The operation principle of cam mechanism, linkage and gear mechanism, while can also connecting rod not of the same race be obtained by shirtsleeve operation
The kinetic characteristic of mechanism and the transitivity for understanding movement.
A kind of synthesis of mechanism demonstration teaching aid, the demonstration teaching aid include riser 9, bottom plate 10, corner brace 11, crank 1, bearing 2, biography
Moving axis 3, gear mechanism 4, cam mechanism and linkage.Eccentric disc 5 is cam mechanism and the driving unit of linkage.
Cam mechanism includes swing rod 6 and resetting spring 13.
Linkage includes connecting rod a7, connecting rod b8, axis pin a121, axis pin b122 and axis pin c123.
Riser 9 is fixed on by corner brace 11 on bottom plate 10 vertically, and bearing 2 is fixed on vertically on bottom plate 10, and crank 1 passes through biography
Moving axis 3 is connected with gear mechanism 4；Transmission shaft 3 is mounted on bearing 2；Gear mechanism 4 is made of gear a401 and gear b402,
Transmission shaft 3 is the central shaft of gear a401, and gear a401 and gear b402 are meshed；The central shaft of gear b402 is mounted on bias
The eccentric part of disk 5；Gear a401 and gear b402 is mounted on the back side of riser 9, and eccentric disc 5 is mounted on the front of riser 9；
Axis pin a121 is installed on eccentric disc 5, one end of swing rod 6 is connected by axis pin a121 with eccentric disc 5, swing rod 6 it is another
End is connected by axis pin b122 with connecting rod b8；Connecting rod b8 and connecting rod a7 is mounted on by axis pin c123 on riser 9；Connecting rod a7's is another
One end is in contact with the circumference of eccentric disc 5.Resetting spring 13 is equipped between the center of connecting rod a7 and riser 9.
The swing rod 6, connecting rod a7, connecting rod b8 are equipped with multiple bearing pin mounting holes arranged side by side, and each bearing pin mounting hole is uniform
It is arranged in juxtaposition.
Eccentric disc 5 is equipped with multiple uniformly distributed bearing pin mounting holes.
The crank 1, bearing 2, swing rod 6, riser 9, bottom plate 10 are made of acrylic board.
Crank 1 is rotated, rotates transmission of the crank 1 by transmission shaft 3 and gear mechanism 4, eccentric disc 5 is driven, then
Observe the characteristics of motion of swing rod 6, by resetting spring 13, swing rod 6 can be contacted with 5 higher pair of eccentric disc.It is simultaneously because eccentric
The movement of disk 5 by changing the position of axis pin a121, axis pin b122 and axis pin c123, can obtain linkage not of the same race,
It is able to observe that the characteristics of motion not of the same race of connecting rod 8.
By observing the movement of gear mechanism 4, the operation principle of gear mechanism can be grasped；By observing and comparing cam
The movement of mechanism and linkage can grasp the concept of low pairs replacing high pair；By observing the movement of linkage, urgency can be observed
The condition and the concept of grasp quickreturn characteristics that return characteristic generates.
If pivot link 8, by observing the movement of linkage, the condition of dead point generation can be observed and grasp dead point
Concept.
During transmission, it may be observed that the structure of transmission shaft 3, the structure of bearing, the structure of key connection and spring 13.
Compared with prior art, the present invention has the following advantages：
Firstth, the present invention comply with Modern Higher Education reform direction, can realize attention efficiency and interest guiding and it is interesting
Intuitively teaching pattern.
Secondth, the present invention is multi-purpose content, creative to integrate various mechanism, can not only be made by visual illustration
The concept of low pairs replacing high pair, the concept of quickreturn characteristics, the concept at dead point etc. are abstracted principle hard to understand originally to be become to be easily understood, and
Also can mechanism conversion and, the comparison of realization different motion rule long by changing each bar bar be realized, simultaneously by shirtsleeve operation
It can also be observed that the transmission of mechanical movement, so as to cultivate the learning interest of student, improve Classroom Teaching, reached reason
The teaching purpose thought.
3rd, the configuration of the present invention is simple, it is at low cost, be convenient for carrying, to dismantle easy to assembly and application flexible, it is easy to use and
Operation has larger market popularization value.
Description of the drawings
Fig. 1 is the overall structure front three-dimensional modeling figure of the present invention.
Fig. 2 is the overall structure reverse side three-dimensional modeling figure of the present invention.
Fig. 3 .1 are position of the invention low pairs replacing high pair mechanism transition diagram for the moment.
Low pairs replacing high pair mechanism transition diagram when Fig. 3 .2 are the position two of the present invention.
Fig. 4 be the present invention different linkages contrast schematic diagram, (a) crank and rocker mechanism；(b) double rocker mechanism.
Fig. 5 .1 are crank and rocker mechanism extreme position of the invention mechanism quickreturn characteristics schematic diagram for the moment.
Mechanism quickreturn characteristics schematic diagram when Fig. 5 .2 are the crank and rocker mechanism extreme position two of the present invention.
Fig. 5 .3 are double rocker mechanism extreme position of the invention mechanism quickreturn characteristics schematic diagram for the moment.
Mechanism quickreturn characteristics schematic diagram when Fig. 5 .4 are the double rocker mechanism extreme position two of the present invention.
Fig. 6 .1 are crank and rocker mechanism extreme position of the invention dead point characteristic schematic diagram for the moment.
Dead point characteristic schematic diagram when Fig. 6 .2 are the crank and rocker mechanism extreme position two of the present invention.
Fig. 6 .3 are double rocker mechanism extreme position of the invention dead point characteristic schematic diagram for the moment.
Dead point characteristic schematic diagram when Fig. 6 .4 are the double rocker mechanism extreme position two of the present invention.
Fig. 7 is the crank three-dimensional modeling figure of the present invention.
Fig. 8 is the eccentric disc three-dimensional modeling figure of the present invention.
Fig. 9 is the gear three-dimensional modeling figure of the present invention.
Specific embodiment
The present invention proposes a kind of synthesis of mechanism demonstration teaching aid.The teaching aid structure is simple, easy to assembly, a model, both
The concept of the concept of low pairs replacing high pair, the concept of quickreturn characteristics and dead point can be demonstrated can observe cam mechanism, linkage again
With the operation principle of gear mechanism, while by shirtsleeve operation, can also obtain linkage not of the same race kinetic characteristic and
Understand the transitivity of movement.
The present invention is further described below in conjunction with the accompanying drawings, but the present invention does not limit to following instance.
As depicted in figs. 1 and 2, a kind of synthesis of mechanism demonstration teaching aid, the demonstration teaching aid include riser 9, bottom plate 10, corner brace
11st, crank 1, bearing 2, transmission shaft 3, gear mechanism 4, cam mechanism and linkage.Eccentric disc 5 is cam mechanism and connecting rod
The driving unit of mechanism.
Cam mechanism includes swing rod 6 and resetting spring 13.
Linkage includes connecting rod a7, connecting rod b8, axis pin a121, axis pin b122 and axis pin c123.
Riser 9 is fixed on by corner brace 11 on bottom plate 10 vertically, and bearing 2 is fixed on vertically on bottom plate 10, and crank 1 passes through biography
Moving axis 3 is connected with gear mechanism 4；Transmission shaft 3 is mounted on bearing 2；Gear mechanism 4 is made of gear a401 and gear b402,
Transmission shaft 3 is the central shaft of gear a401, and gear a401 and gear b402 are meshed；The central shaft of gear b402 is mounted on bias
The eccentric part of disk 5；Gear a401 and gear b402 is mounted on the back side of riser 9, and eccentric disc 5 is mounted on the front of riser 9；
Axis pin a121 is installed on eccentric disc 5, one end of swing rod 6 is connected by axis pin a121 with eccentric disc 5, swing rod 6 it is another
End is connected by axis pin b122 with connecting rod b8；Connecting rod b8 and connecting rod a7 is mounted on by axis pin c123 on riser 9；Connecting rod a7's is another
One end is in contact with the circumference of eccentric disc 5.Resetting spring 13 is equipped between the center of connecting rod a7 and riser 9.
The swing rod 6, connecting rod a7, connecting rod b8 are equipped with multiple bearing pin mounting holes arranged side by side, and each bearing pin mounting hole is uniform
It is arranged in juxtaposition.
Eccentric disc 5 is equipped with multiple uniformly distributed bearing pin mounting holes.
The crank 1, bearing 2, swing rod 6, riser 9 and bottom plate 10 are made of acrylic board.
Crank 1 is rotated, rotates transmission of the crank 1 by transmission shaft 3 and gear mechanism 4, eccentric disc 5 is driven, then
Observe the characteristics of motion of swing rod 6, by resetting spring 13, swing rod 6 can be contacted with 5 higher pair of eccentric disc.It is simultaneously because eccentric
The movement of disk 5 by changing the position of axis pin a121, axis pin b122 and axis pin c123, can obtain linkage not of the same race,
It is able to observe that the characteristics of motion not of the same race of connecting rod b8.
By observing the movement of gear mechanism 4, the operation principle of gear mechanism can be grasped；By observing and comparing cam
The movement of mechanism and linkage can grasp the concept of low pairs replacing high pair；By observing the movement of linkage, urgency can be observed
The condition and the concept of grasp quickreturn characteristics that return characteristic generates.
If pivot link b8, by observing the movement of linkage, the condition of dead point generation can be observed and grasped dead
The concept of point.
During transmission, it may be observed that the structure of transmission shaft 3, the structure of bearing, the structure of key connection and spring 13.
As shown in figure 3, demonstrate the conversion of the concept and mechanism of low pairs replacing high pair.Cam swing mechanism by low pairs replacing high pair with
After become four-bar mechanism, front and rear mechanism freedom and the instantaneous velocity of mechanism are identical with instantaneous acceleration.
As shown in figure 4, demonstrating by changing, bar is long, and utilizes the fixed two kinds of obtained linkages of axis pin connection.
As shown in Fig. 5 .1-5.4, the condition of quickreturn characteristics generation and the concept of quickreturn characteristics are demonstrated.Fig. 5 .1-5.2 are drilled
Show extreme position of the crank and rocker mechanism in two rocking bars, explain the concept of quickreturn characteristics；Fig. 5 .3-5.4 demonstrate double shake
Linkage does not have quickreturn characteristics in entire motion process.
As shown in Fig. 6 .1-6.4, the condition of dead point characteristic generation and the concept at dead point are demonstrated.Using connecting rod b8 as actively
Part demonstrates extreme position of the crank and rocker mechanism in two rocking bars in Fig. 6 .1-6.2, and crank generates dead-centre position；Figure
Double rocker mechanism is demonstrated in 6.3-6.4 does not have dead-centre position in entire motion process.
As shown in figure 8, eccentric disc 5 is equipped with bearing pin mounting hole a501 and multiple uniformly distributed bearing pin mounting hole b502, pin
Shaft mounting hole a501 is off-centre operation mounting hole, and the cloth of each bearing pin mounting hole b502 is set to T-shaped.
The crank is the part held during demonstration, for hexagonal prism, equivalent diameter 8mm, length 18mm, handle
The a diameter of 30mm of activity.The supporting stand size is 20mm × 10mm × 70mm, and the transmission shaft is a multi-diameter shaft, equipped with interior
The deep groove ball bearing with sealing ring of footpath 4mm outer diameters 8mm, one end of axis are connected with crank, and fitted bearing basic hole system is mounted on branch
On seat, other end fitted bearing basic hole system is mounted in the through hole of riser.
The gear mechanism is for transmission mechanism, is 60mm using two reference diameters, modulus 1mm, tooth
Number is the straight spur gear of z=60, is arranged up and down.The cam mechanism includes eccentric disc, swing rod and resetting spring, institute
The a diameter of 70mm for the eccentric disc stated, the centre of gyration are deviateed at its geometric center 20mm, are fixed on using bolt and gear
Together, 3 through holes are carved in surface at deviation geometric center 20mm, 40mm, 60mm respectively.The oscillating bar length is
70mm is carved with 5 equidistant through holes in its one end, and the other end is carved with 1 through hole.The resetting spring is smaller stiffness system
Several tension springs, spring filament diameter 0.8mm, spring major diameter 6mm, length 50mm, one end of which is fixed on swing rod, the other end is fixed on vertical
On plate.
The linkage is on the basis of eccentric disc, increases a quarter butt and a root long bar.The quarter butt
Length for 70mm, its one end is carved with 3 equidistant through holes, and the other end is carved with 1 through hole.The long pole length is 180mm,
One end is carved with its one end and is carved with 5 equidistant through holes, and the other end is carved with 1 through hole.On the one end and stock in the multiple holes of quarter butt
The one end in multiple holes is fixed together by axis pin, and the other end of quarter butt is fixed at the eccentric disc centre of gyration, stock it is another
One end and one end of swing rod are fixed on by axis pin on riser, and the distance of the centre of gyration of fixed point and eccentric disc is 150mm.
Claims (4)
1. a kind of synthesis of mechanism demonstration teaching aid, it is characterised in that：The demonstration teaching aid includes riser (9), bottom plate (10), corner brace
(11), crank (1), bearing (2), transmission shaft (3), gear mechanism (4), cam mechanism and linkage；Eccentric disc (5) is convex
Take turns the driving unit of mechanism and linkage；
Cam mechanism includes swing rod (6) and resetting spring (13)；
Linkage includes connecting rod a (7), connecting rod b (8), axis pin a (121), axis pin b (122) and axis pin c (123)；
Riser (9) is fixed on by corner brace (11) on bottom plate (10) vertically, and bearing (2) is fixed on vertically on bottom plate (10), crank
(1) it is connected by transmission shaft (3) with gear mechanism (4)；Transmission shaft (3) is mounted on bearing (2)；Gear mechanism (4) is by gear a
(401) and gear b (402) compositions, transmission shaft (3) are the central shaft of gear a (401), gear a (401) and gear b (402) phase
Engagement；The central shaft of gear b (402) is mounted on the eccentric part of eccentric disc (5)；Gear a (401) and gear b (402) are mounted on
The back side of riser (9), eccentric disc (5) are mounted on the front of riser (9)；Axis pin a (121) on eccentric disc (5) is installed, is put
One end of bar (6) is connected by axis pin a (121) with eccentric disc (5), and the other end of swing rod (6) by axis pin b (122) and connects
Bar b (8) connections；Connecting rod b (8) and connecting rod a (7) is mounted on by axis pin c (123) on riser (9)；The other end of connecting rod a (7) with
The circumference of eccentric disc (5) is in contact；Resetting spring (13) is equipped between the center of connecting rod a (7) and riser (9).
2. a kind of synthesis of mechanism demonstration teaching aid according to claim 1, it is characterised in that：The swing rod (6), connecting rod a
(7), connecting rod b (8) is equipped with multiple bearing pin mounting holes arranged side by side, and each bearing pin mounting hole is uniformly arranged in juxtaposition.
3. a kind of synthesis of mechanism demonstration teaching aid according to claim 1, it is characterised in that：Eccentric disc (5) is equipped with more
A uniformly distributed bearing pin mounting hole.
4. a kind of synthesis of mechanism demonstration teaching aid according to claim 1, it is characterised in that：The crank (1), bearing (2),
Swing rod (6), riser (9) and bottom plate (10) are made of acrylic board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810080586.5A CN108062905B (en) | 2018-01-28 | 2018-01-28 | Comprehensive demonstration teaching aid for mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810080586.5A CN108062905B (en) | 2018-01-28 | 2018-01-28 | Comprehensive demonstration teaching aid for mechanism |
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| Publication Number | Publication Date |
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| CN108062905A true CN108062905A (en) | 2018-05-22 |
| CN108062905B CN108062905B (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810080586.5A Active CN108062905B (en) | 2018-01-28 | 2018-01-28 | Comprehensive demonstration teaching aid for mechanism |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108847084A (en) * | 2018-08-30 | 2018-11-20 | 郑月光 | Electromechanical engineering practical training teaching aid |
| CN110264851A (en) * | 2019-06-17 | 2019-09-20 | 南京航空航天大学 | A kind of experimental facilities for mechanics innovation experimental teaching |
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| CN204808737U (en) * | 2015-06-04 | 2015-11-25 | 宜春学院 | Link mechanism appearance of imparting knowledge to students |
| CN208422244U (en) * | 2018-01-28 | 2019-01-22 | 北京工业大学 | A kind of synthesis of mechanism demonstration teaching aid |
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| DD285158A5 (en) * | 1989-06-15 | 1990-12-05 | Ingenieurhochschule Berlin-Wartenberg,Dd | ADJUSTMENT DEVICE FOR A CRANKSHAFT |
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| CN104933939A (en) * | 2014-03-20 | 2015-09-23 | 南京农业大学 | Linkage mechanism comprehensive experimental device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108847084A (en) * | 2018-08-30 | 2018-11-20 | 郑月光 | Electromechanical engineering practical training teaching aid |
| CN108847084B (en) * | 2018-08-30 | 2020-10-30 | 绍兴不忘初心机械设计有限公司 | Real teaching aid of instructing of electromechanical engineering |
| CN110264851A (en) * | 2019-06-17 | 2019-09-20 | 南京航空航天大学 | A kind of experimental facilities for mechanics innovation experimental teaching |
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| Publication number | Publication date |
|---|---|
| CN108062905B (en) | 2023-12-15 |
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