CN208422244U - A kind of synthesis of mechanism demonstration teaching aid - Google Patents
A kind of synthesis of mechanism demonstration teaching aid Download PDFInfo
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- CN208422244U CN208422244U CN201820139601.4U CN201820139601U CN208422244U CN 208422244 U CN208422244 U CN 208422244U CN 201820139601 U CN201820139601 U CN 201820139601U CN 208422244 U CN208422244 U CN 208422244U
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Abstract
The utility model discloses a kind of synthesis of mechanism demonstration teaching aid, which includes vertical plate, bottom plate, corner brace, crank, support, transmission shaft, gear mechanism, cam mechanism and link mechanism.Eccentric disc is the driving unit of cam mechanism and link mechanism.Cam mechanism includes swing rod and reset spring.Link mechanism includes connecting rod a, connecting rod b, pin shaft a, pin shaft b and pin shaft c.Crank is rotated, rotation crank passes through the transmitting of transmission shaft and gear mechanism, and eccentric disc is driven, and then observes the characteristics of motion of swing rod, by reset spring, swing rod can be contacted with eccentric disc higher pair.Due to the movement of eccentric disc, by changing the position of pin shaft a, pin shaft b and pin shaft c, available link mechanism not of the same race is able to observe that the characteristics of motion not of the same race of connecting rod b.The utility model makes the learning interest for having cultivated student by visual illustration, improves Classroom Teaching, has reached ideal teaching purpose.
Description
Technical field
The utility model relates to a kind of teaching aid, the synthesis of mechanism intuitive suitable for Fundamentals of Machine Design is demonstrated, is led to
The teaching aid is crossed, concept, quickreturn characteristics concept, dead point concept and the various mechanism of energy visual illustration low pairs replacing high pair are comprehensive and move
Principle.
Background technique
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 the teaching pattern of that previous weight knowledge implantation, light ability of creative culture.And mechanical speciality is made
Based on one of profession, many course contents all with the practical connection of engineering closely, improve the one of Students ' Innovative Thinking Ability
A effective way is exactly the demonstration of classroom mock-up.It contacts, but also has very strong in this way, not only being established with the theoretical knowledge in course
Intuitive, students' union feel this novel, and teaching efficiency can be more preferable.
However, a backbone technology basic course of the Fundamentals of Machine Design as mechanical speciality, most schools are used
Multimedia mode teaching, in the course, concept, the concept of quickreturn characteristics, the concept at dead point and a variety of machines of low pairs replacing high pair
Structure synthesis and motion principle, because relatively more abstract, if only be easy to causeing student to be difficult to understand for by conceptual understanding.
It therefore, can be more deep intuitively by observation, operation and the comparison to a kind of synthesis of mechanism demonstration teaching aid on classroom
Understand that the content of course is particularly important.
Utility model content
In view of the deficiencies of the prior art, the utility model proposes a kind of synthesis of mechanism demonstration teaching aids.Teaching aid structure letter
Single, easy to assembly 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
To observe cam mechanism, link mechanism and the working principle of gear mechanism, while difference can also be obtained by shirtsleeve operation
The kinetic characteristic of kind link mechanism and the transitivity for understanding movement.
A kind of synthesis of mechanism demonstration teaching aid, the demonstration teaching aid include vertical plate 9, bottom plate 10, corner brace 11, crank 1, support 2, pass
Moving axis 3, gear mechanism 4, cam mechanism and link mechanism.Eccentric disc 5 is the driving unit of cam mechanism and link mechanism.
Cam mechanism includes swing rod 6 and reset spring 13.
Link mechanism includes connecting rod a7, connecting rod b8, pin shaft a121, pin shaft b122 and pin shaft c123.
Vertical plate 9 is fixed on bottom plate 10 vertically by corner brace 11, and support 2 is fixed on vertically on bottom plate 10, and crank 1 passes through biography
Moving axis 3 is connect with gear mechanism 4；Transmission shaft 3 is mounted on support 2；Gear mechanism 4 is made of gear a401 and gear b402,
Transmission shaft 3 is the central axis of gear a401, and gear a401 and gear b402 are meshed；The central axis 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 vertical plate 9, and eccentric disc 5 is mounted on the front of vertical plate 9；
Pin shaft a121 is installed on eccentric disc 5, one end of swing rod 6 is connect by pin shaft a121 with eccentric disc 5, swing rod 6 it is another
End is connect by pin shaft b122 with connecting rod b8；Connecting rod b8 and connecting rod a7 are mounted on vertical plate 9 by pin shaft c123；Connecting rod a7's is another
One end is in contact with the circumference of eccentric disc 5.Reset spring 13 is equipped between connecting rod a7 and the center of vertical plate 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, support 2, swing rod 6, vertical plate 9, bottom plate 10 are all made of acrylic board and are made.
Crank 1 is rotated, rotation crank 1 passes through the transmitting of transmission shaft 3 and gear mechanism 4, and eccentric disc 5 is driven, then
The characteristics of motion for observing swing rod 6, by reset spring 13, swing rod 6 can be contacted with 5 higher pair of eccentric disc.Simultaneously because eccentric
The movement of disk 5, by change pin shaft a121, pin shaft b122 and pin shaft c123 position, available link mechanism 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 working principle of gear mechanism can be grasped；By observing and comparing cam
The movement of mechanism and link mechanism can grasp the concept of low pairs replacing high pair；By observing the movement of link mechanism, urgency can be observed
The concept of condition and grasp quickreturn characteristics that return characteristic generates.
If pivot link 8, by observing the movement of link mechanism, the condition of dead point generation can be observed and grasping dead point
Concept.
During transmission, it may be observed that structure, the structure of bearing, the structure of key connection and spring 13 of transmission shaft 3.
Compared with prior art, the utility model has the advantage that
The first, the utility model comply with Modern Higher Education reform direction, be able to achieve pay attention to efficiency and interest guiding and
Interesting intuitive teaching pattern.
The second, the utility model is multi-purpose content, creative to integrate various mechanism, can not only be drilled by material object
Show that the concept for making low pairs replacing high pair, the concept of quickreturn characteristics, the concept at dead point etc. are abstracted principle hard to understand originally and become to be easily understood,
And shirtsleeve operation can be passed through, implementation mechanism conversion and, the comparison of realization different motion rule long by changing each bar bar,
It can also be observed that the transmitting of mechanical movement simultaneously, to cultivate the learning interest of student, improve Classroom Teaching, reach
Ideal teaching purpose.
Third, the utility model structure be simple, it is at low cost, be convenient for carrying, dismantle easy to assembly and flexible in application, conveniently make
With and operation, have biggish market popularization value.
Detailed description of the invention
Fig. 1 is the overall structure front three-dimensional modeling figure of the utility model.
Fig. 2 is the overall structure reverse side three-dimensional modeling figure of the utility model.
Fig. 3 .1 is the position low pairs replacing high pair mechanism transition diagram for the moment of the utility model.
Low pairs replacing high pair mechanism transition diagram when Fig. 3 .2 is the position two of the utility model.
Fig. 4 is the contrast schematic diagram of the different link mechanisms of the utility model, (a) crank and rocker mechanism；(b) double rocking lever machine
Structure.
Fig. 5 .1 is the crank and rocker mechanism extreme position mechanism quickreturn characteristics schematic diagram for the moment of the utility model.
Mechanism quickreturn characteristics schematic diagram when Fig. 5 .2 is the crank and rocker mechanism extreme position two of the utility model.
Fig. 5 .3 is the double rocker mechanism extreme position mechanism quickreturn characteristics schematic diagram for the moment of the utility model.
Mechanism quickreturn characteristics schematic diagram when Fig. 5 .4 is the double rocker mechanism extreme position two of the utility model.
Fig. 6 .1 is the crank and rocker mechanism extreme position dead point characteristic schematic diagram for the moment of the utility model.
Dead point characteristic schematic diagram when Fig. 6 .2 is the crank and rocker mechanism extreme position two of the utility model.
Fig. 6 .3 is the double rocker mechanism extreme position dead point characteristic schematic diagram for the moment of the utility model.
Dead point characteristic schematic diagram when Fig. 6 .4 is the double rocker mechanism extreme position two of the utility model.
Fig. 7 is the crank three-dimensional modeling figure of the utility model.
Fig. 8 is the eccentric disc three-dimensional modeling figure of the utility model.
Fig. 9 is the gear three-dimensional modeling figure of the utility model.
Specific embodiment
The utility model proposes a kind of synthesis of mechanism demonstration teaching aids.The teaching aid structure is simple, easy to assembly, a mould
Type 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 cam mechanism, connecting rod
The working principle of mechanism and gear mechanism, while the movement that by shirtsleeve operation, can also obtain link mechanism not of the same race is special
Property and understand movement transitivity.
The utility model is further described with reference to the accompanying drawing, but the utility model 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 vertical plate 9, bottom plate 10, corner brace
11, crank 1, support 2, transmission shaft 3, gear mechanism 4, cam mechanism and link mechanism.Eccentric disc 5 is cam mechanism and connecting rod
The driving unit of mechanism.
Cam mechanism includes swing rod 6 and reset spring 13.
Link mechanism includes connecting rod a7, connecting rod b8, pin shaft a121, pin shaft b122 and pin shaft c123.
Vertical plate 9 is fixed on bottom plate 10 vertically by corner brace 11, and support 2 is fixed on vertically on bottom plate 10, and crank 1 passes through biography
Moving axis 3 is connect with gear mechanism 4；Transmission shaft 3 is mounted on support 2；Gear mechanism 4 is made of gear a401 and gear b402,
Transmission shaft 3 is the central axis of gear a401, and gear a401 and gear b402 are meshed；The central axis 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 vertical plate 9, and eccentric disc 5 is mounted on the front of vertical plate 9；
Pin shaft a121 is installed on eccentric disc 5, one end of swing rod 6 is connect by pin shaft a121 with eccentric disc 5, swing rod 6 it is another
End is connect by pin shaft b122 with connecting rod b8；Connecting rod b8 and connecting rod a7 are mounted on vertical plate 9 by pin shaft c123；Connecting rod a7's is another
One end is in contact with the circumference of eccentric disc 5.Reset spring 13 is equipped between connecting rod a7 and the center of vertical plate 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, support 2, swing rod 6, vertical plate 9 and bottom plate 10 are all made of acrylic board and are made.
Crank 1 is rotated, rotation crank 1 passes through the transmitting of transmission shaft 3 and gear mechanism 4, and eccentric disc 5 is driven, then
The characteristics of motion for observing swing rod 6, by reset spring 13, swing rod 6 can be contacted with 5 higher pair of eccentric disc.Simultaneously because eccentric
The movement of disk 5, by change pin shaft a121, pin shaft b122 and pin shaft c123 position, available link mechanism 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 working principle of gear mechanism can be grasped；By observing and comparing cam
The movement of mechanism and link mechanism can grasp the concept of low pairs replacing high pair；By observing the movement of link mechanism, urgency can be observed
The concept of condition and grasp quickreturn characteristics that return characteristic generates.
If pivot link b8, by observing the movement of link mechanism, the condition of dead point generation can be observed and grasping dead
The concept of point.
During transmission, it may be observed that structure, the structure of bearing, the structure of key connection and spring 13 of transmission shaft 3.
As shown in figure 3, demonstrating 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, the mechanism freedom of front and back is identical with instantaneous acceleration with the instantaneous velocity of mechanism.
As shown in figure 4, demonstrating by changing bar two kinds of link mechanisms that are long, and being connected and fixed using pin shaft.
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 is drilled
Show that crank and rocker mechanism in the extreme position of two rocking bars, explains the concept of quickreturn characteristics；Fig. 5 .3-5.4 demonstrates 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.It is actively with connecting rod b8
Part demonstrates crank and rocker mechanism in the extreme position of two rocking bars in Fig. 6 .1-6.2, and crank produces 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 as T shape.
The crank is the part held when demonstration, is hexagonal prism, equivalent diameter 8mm, length 18mm, handle
Movable diameter is 30mm.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 diameter 4mm outer diameter 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 vertical plate.
The gear mechanism is for transmission mechanism, is 60mm, modulus 1mm, tooth using two reference diameters
Number is the straight spur gear of z=60, is arranged up and down.The cam mechanism includes eccentric disc, swing rod and reset spring, institute
The diameter for the eccentric disc stated is 70mm, and the centre of gyration is deviateed at its geometric center 20mm, is fixed on using bolt and gear
Together, geometric center 20mm is being deviateed respectively in surface, is carved with 3 through-holes at 40mm, 60mm.The oscillating bar length is
70mm is carved with 5 equidistant through-holes in one end, and the other end is carved with 1 through-hole.The reset 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 link mechanism is to increase a quarter butt and a root long bar on the basis of eccentric disc.The quarter butt
Length be 70mm, 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 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 pin shaft, 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 vertical plate by pin shaft, and fixed point is 150mm at a distance from the centre of gyration of eccentric disc.
Claims (4)
1. a kind of synthesis of mechanism demonstration teaching aid, it is characterised in that: the demonstration teaching aid includes vertical plate (9), bottom plate (10), corner brace
(11), crank (1), support (2), transmission shaft (3), gear mechanism (4), cam mechanism and link mechanism；Eccentric disc (5) is convex
Take turns the driving unit of mechanism and link mechanism；
Cam mechanism includes swing rod (6) and reset spring (13)；
Link mechanism includes connecting rod a (7), connecting rod b (8), pin shaft a (121), pin shaft b (122) and pin shaft c (123)；
Vertical plate (9) is fixed on bottom plate (10) vertically by corner brace (11), and support (2) is fixed on vertically on bottom plate (10), crank
(1) it is connect by transmission shaft (3) with gear mechanism (4)；Transmission shaft (3) is mounted on support (2)；Gear mechanism (4) is by gear a
(401) and gear b (402) composition, transmission shaft (3) are the central axis of gear a (401), gear a (401) and gear b (402) phase
Engagement；The central axis 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 vertical plate (9), eccentric disc (5) are mounted on the front of vertical plate (9)；It is equipped with pin shaft a (121), puts on eccentric disc (5)
One end of bar (6) is connect by pin shaft a (121) with eccentric disc (5), and the other end of swing rod (6) is by pin shaft b (122) and even
Bar b (8) connection；Connecting rod b (8) and connecting rod a (7) is mounted on vertical plate (9) by pin shaft c (123)；The other end of connecting rod a (7) with
The circumference of eccentric disc (5) is in contact；Reset spring (13) are equipped between connecting rod a (7) and the center of vertical plate (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), support (2),
Swing rod (6), vertical plate (9) and bottom plate (10) are all made of acrylic board and are made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820139601.4U CN208422244U (en) | 2018-01-28 | 2018-01-28 | A kind of synthesis of mechanism demonstration teaching aid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820139601.4U CN208422244U (en) | 2018-01-28 | 2018-01-28 | A kind of synthesis of mechanism demonstration teaching aid |
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| CN208422244U true CN208422244U (en) | 2019-01-22 |
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ID=65120892
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108062905A (en) * | 2018-01-28 | 2018-05-22 | 北京工业大学 | A kind of synthesis of mechanism demonstration teaching aid |
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- 2018-01-28 CN CN201820139601.4U patent/CN208422244U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108062905A (en) * | 2018-01-28 | 2018-05-22 | 北京工业大学 | A kind of synthesis of mechanism demonstration teaching aid |
| CN108062905B (en) * | 2018-01-28 | 2023-12-15 | 北京工业大学 | Comprehensive demonstration teaching aid for mechanism |
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