CN108022499B - Open-close type mechanical principle demonstration teaching aid - Google Patents
Open-close type mechanical principle demonstration teaching aid Download PDFInfo
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- CN108022499B CN108022499B CN201711427209.6A CN201711427209A CN108022499B CN 108022499 B CN108022499 B CN 108022499B CN 201711427209 A CN201711427209 A CN 201711427209A CN 108022499 B CN108022499 B CN 108022499B
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- 230000007246 mechanism Effects 0.000 claims abstract description 109
- 238000000034 method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 1
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)
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Abstract
The invention discloses an open-close mechanical principle demonstration teaching aid which is characterized by comprising a frame, an open-close mechanism and an open-close driving mechanism, wherein the open-close mechanism is arranged at the upper end of the frame, the open-close driving mechanism comprises a push rod, a crank slide block mechanism, a crank rocker mechanism and a rotation driving device, the rotation driving device is fixed on the frame and connected with the crank slide block mechanism, a vertical slideway is fixedly arranged on the frame, the crank slide block mechanism and the crank rocker mechanism are in sliding fit with the slideway, the crank slide block mechanism pushes the crank rocker mechanism to move, the crank rocker mechanism is connected with the push rod, the open-close mechanism comprises a top seat and a plurality of groups of four-bar mechanisms which have the same structure and are distributed along the circumferential direction, the top seat is fixedly connected with the upper end of the push rod, and the four-bar mechanism is respectively hinged with the upper end of the frame and the top seat; the student can intuitively and specifically know the motion trail and the motion principle of each mechanism, and is helpful for the student to better master the knowledge of the mechanical principle; and the structure is small and exquisite, convenient to carry.
Description
Technical Field
The invention relates to a demonstration teaching aid for classroom or experiment teaching, in particular to an open-close type mechanical principle demonstration teaching aid.
Background
The mechanical principle is a core course of the machinery profession, at present, the mechanical principle teaching is mostly principle concept and calculation, and the example teaching in the class is very few, which leads to the dislocation of the current college student theory and practice, and the learned knowledge cannot be well applied to practice. In order to make course teaching of mechanical principles more effective, students can understand the theoretical knowledge of boring holes more fully, and the use of teaching aids is particularly important.
Disclosure of Invention
The invention aims to provide the open-close type mechanical principle demonstration teaching aid which can be used for physically demonstrating the movement process of various different structures in a mechanical principle course, so that course teaching is vivid and effective.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides an open-close type mechanical principle demonstration teaching aid, includes frame, open and shut mechanism and open and shut actuating mechanism, open and shut mechanism set up the upper end of frame, open and shut actuating mechanism include push rod, slider crank mechanism, crank rocker mechanism and rotation actuating device, rotation actuating device fix the frame on and with slider crank mechanism be connected, the frame on fixedly be provided with vertical slide, slider crank mechanism with crank rocker mechanism all with slide sliding fit, slider crank mechanism promote crank rocker mechanism motion, crank rocker mechanism with the push rod be connected with drive open and shut mechanism realize opening and shutting, open and shut mechanism include the four-bar linkage that footstock and multiunit structure are the same and distribute along the circumferencial direction, the footstock with the upper end fixed connection of push rod, four-bar linkage respectively with the upper end of frame with the footstock articulated mutually.
Further, the rotation driving device comprises a motor, a worm wheel, a worm, a first bevel gear, a second bevel gear, a first wheel shaft and a second wheel shaft, wherein the motor is fixed on the frame, the worm is fixedly connected with a driving shaft of the motor coaxially, the first wheel shaft and the second wheel shaft are both connected with the frame in a shaft mode and are vertical to each other, the worm wheel and the first bevel gear are respectively connected with the first wheel shaft coaxially and fixedly, the worm wheel is meshed with the worm, the second bevel gear is connected with the second wheel shaft coaxially and fixedly, and the second bevel gear is meshed with the first bevel gear.
Further, the crank slide block mechanism comprises a first slide block, a first connecting rod and a second connecting rod, wherein the first slide block is in vertical sliding fit with the slideway, the upper end of the first connecting rod is hinged with the first slide block, the lower end of the first connecting rod is hinged with one end of the second connecting rod, and the other end of the second connecting rod is fixedly connected with the second wheel shaft.
Further, the crank rocker mechanism comprises a second slider, a third connecting rod, a fourth connecting rod, a fifth connecting rod, a sixth connecting rod and a seventh connecting rod, wherein the second slider is vertically in sliding fit with the slideway and is located above the first slider, the lower end of the third connecting rod is hinged with the second slider, the upper end of the third connecting rod, one end of the fourth connecting rod, the lower end of the fifth connecting rod and the lower end of the sixth connecting rod are hinged with each other, the other end of the fourth connecting rod is hinged to the frame, the upper end of the fifth connecting rod is hinged to the push rod, the upper end of the sixth connecting rod is hinged to one end of the seventh connecting rod, the other end of the seventh connecting rod is hinged to the frame, a spring is fixedly connected between the upper end of the fifth connecting rod and the other end of the seventh connecting rod, a cam seat is fixedly arranged on the frame, a cam dead point is fixedly connected with the cam seat on the frame, the cam seat is fixedly connected with the upper dead point of the cam seat, and the cam mechanism is fixedly arranged on the cam seat and is in the dead point position of the cam seat.
Further, the four-bar linkage mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, wherein the lower end of the first connecting rod is hinged with the upper end of the frame, the upper end of the first connecting rod is hinged with the third connecting rod, the lower end of the second connecting rod is hinged with the first connecting rod, the upper end of the second connecting rod is hinged with the top seat, the lower end of the third connecting rod is hinged with the lower end of the fourth connecting rod, the upper end of the third connecting rod is a free end, and the upper end of the fourth connecting rod is hinged with the second connecting rod.
Compared with the prior art, the open-close mechanical principle demonstration teaching aid has the advantages that various mechanisms (such as a crank-slider mechanism, a crank-rocker mechanism, a four-bar mechanism, a cam mechanism, a gear mechanism and the like) in a mechanical principle course are perfectly combined, the physical demonstration is carried out on the movement process of each mechanism, the coordination among the mechanisms is more vividly described, students can intuitively and specifically know the movement track and the movement principle of each mechanism, and the students can better master the knowledge of the mechanical principle; the structure is small and exquisite, and the carrying is convenient; in addition, the mechanical principle demonstration teaching aid can realize the opening and closing of the opening and closing mechanism and intermittent motion, and can also be used as equipment capable of realizing the opening and closing.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic diagram showing a state in which the crank-slider mechanism of the present invention pushes the crank-rocker mechanism to be at the top dead center;
fig. 3 is a schematic view of the crank rocker mechanism of the present invention in a bottom dead center state.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in the figure, the open-close mechanical principle demonstration teaching aid comprises a frame 1, an open-close mechanism and an open-close driving mechanism, wherein the open-close mechanism is arranged at the upper end of the frame 1, the open-close driving mechanism comprises a push rod 2, a crank-slider mechanism, a crank-rocker mechanism and a rotation driving device, the rotation driving device is fixed on the frame 1 and connected with the crank-slider mechanism, a vertical slideway 3 is fixedly arranged on the frame 1, the crank-slider mechanism and the crank-rocker mechanism are in sliding fit with the slideway 3, the crank-slider mechanism pushes the crank-rocker mechanism to move, and the crank-rocker mechanism is connected with the push rod 2 to drive the open-close mechanism to realize open-close;
the rotation driving device comprises a motor 4, a worm wheel 5, a worm 6, a first bevel gear 7, a second bevel gear 8, a first wheel shaft 9 and a second wheel shaft 10, wherein the motor 4 is fixed on the frame 1, the worm 6 is coaxially and fixedly connected with a driving shaft of the motor 4, the first wheel shaft 9 and the second wheel shaft 10 are both in shaft connection with the frame 1 and are vertical to each other, the worm wheel 5 and the first bevel gear 7 are respectively and fixedly connected with the first wheel shaft 9, the worm wheel 5 is meshed with the worm 6, the second bevel gear 8 is coaxially and fixedly connected with the second wheel shaft 10, the second bevel gear 8 is meshed with the first bevel gear 7, the crank slider mechanism comprises a first slider 11, a first connecting rod 12 and a second connecting rod 13, the first slider 11 is in vertical sliding fit with the slideway 3, the upper end of the first connecting rod 12 is hinged with the first slider 11, the lower end of the first connecting rod 12 is hinged with one end of the second connecting rod 13, and the other end of the second connecting rod 13 is fixedly connected with the second wheel shaft 10;
the crank rocker mechanism comprises a second slide block 14, a third connecting rod 15, a fourth connecting rod 16, a fifth connecting rod 17, a sixth connecting rod 18 and a seventh connecting rod 19, wherein the second slide block 14 is vertically matched with the slideway 3 in a sliding way and is positioned above the first slide block 11, the lower end of the third connecting rod 15 is hinged with the second slide block 14, the upper end of the third connecting rod 15, one end of the fourth connecting rod 16, the lower end of the fifth connecting rod 17 and the lower end of the sixth connecting rod 18 are hinged with each other, the other end of the fourth connecting rod 16 is hinged with the frame 1, the upper end of the fifth connecting rod 18 is hinged with one end of the seventh connecting rod 19, the other end of the seventh connecting rod 19 is hinged with the frame 1, a cam seat 21 is fixedly arranged on the frame 1, a cam shaft (not shown in the drawing) is fixedly arranged on the cam seat 21, the cam shaft (not shown in the drawing) is in a dead center state, the dead center state is in a dead center state, when the cam shaft (not shown in the drawing) is in a dead center state, and the dead center state is in a crank mechanism and is in a dead center state, and is in a crank mechanism and is in a dead and a crank state, and is in a dead and a lower state, and is in a state, and a rocker state is in a open and/open state;
the opening and closing mechanism comprises a top seat 24 and a plurality of groups of four-bar mechanisms which are identical in structure and distributed along the circumferential direction, the top seat 24 is fixedly connected with the upper end of the push rod 2, the four-bar mechanisms are respectively hinged with the upper end of the frame 1 and the top seat 24, each four-bar mechanism comprises a first connecting bar 25, a second connecting bar 26, a third connecting bar 27 and a fourth connecting bar 28, the lower end of the first connecting bar 25 is hinged with the upper end of the frame 1, the upper end of the first connecting bar 25 is hinged with the third connecting bar 27, the lower end of the second connecting bar 26 is hinged with the first connecting bar 25, the upper end of the second connecting bar 26 is hinged with the top seat 24, the lower end of the third connecting bar 27 is hinged with the lower end of the fourth connecting bar 28, the upper end of the third connecting bar 27 is a free end, and the upper end of the fourth connecting bar 28 is hinged with the second connecting bar 26.
In the above embodiment, the motion process of the open-close mechanical principle demonstration teaching aid is as follows: the motor 4 works and drives the cam 22 and the second connecting rod 13 in the crank-rocker mechanism to rotate at the same time, the second connecting rod 13 pushes the first slider 11 to move upwards through the first connecting rod 12, the first slider 11 pushes the second slider 14 in the crank-rocker mechanism to move upwards, so that the fifth connecting rod 17 pushes the push rod 2 to move upwards, the push rod 2 drives the top seat 24 in the opening-closing mechanism to move upwards, the top seat 24 drives the four-bar mechanisms to synchronously rotate inwards, the opening-closing mechanism is closed, when the first slider 11 moves upwards to the highest point, the sixth connecting rod 18 and the seventh connecting rod 19 in the crank-rocker mechanism are overlapped, at the moment, the crank-rocker mechanism is in a top dead center state, as shown in fig. 2, after the second connecting rod 13 drives the first slider 11 to move downwards for a certain distance, the cam 22 knocks the sixth connecting rod 18 to unlock the top dead center state of the crank-rocker mechanism, and during the period, the opening-closing mechanism is in a closed intermittent state; when the top dead center state of the crank-rocker mechanism is unlocked, under the dead weight of the push rod 2 and the crank-rocker mechanism, the second slide block 14 is pushed to slide downwards, the push rod 2 drives the footstock 24 in the opening-closing mechanism to move downwards, the footstock 24 drives the four-bar mechanisms to synchronously rotate outwards, so that the opening-closing mechanism is opened, when the second slide block 14 slides downwards to the lowest point, the third connecting rod 15 and the fourth connecting rod 16 are positioned on the same straight line, at the moment, the crank-rocker mechanism is in a bottom dead center state, as shown in fig. 3, the spring 20 is compressed, and when the second connecting rod 13 repeatedly drives the first slide block 11 to move upwards, the spring 20 pushes the fifth connecting rod 17 (namely the push rod 2) to move upwards under the action of elastic force so as to unlock the bottom dead center state of the crank-rocker mechanism, and during the period, the opening-closing mechanism is in an open intermittent state.
Claims (1)
1. The open-close mechanical principle demonstration teaching aid is characterized by comprising a frame, an open-close mechanism and an open-close driving mechanism, wherein the open-close mechanism is arranged at the upper end of the frame and comprises a push rod, a crank slide block mechanism, a crank slide rod mechanism and a rotation driving device, the rotation driving device is fixed on the frame and connected with the crank slide block mechanism, a vertical slideway is fixedly arranged on the frame, the crank slide block mechanism and the crank slide rod mechanism are in sliding fit with the slideway, the crank slide block mechanism pushes the crank slide rod mechanism to move, the crank slide rod mechanism is connected with the push rod to drive the open-close mechanism to realize open-close, the open-close mechanism comprises a top seat and a plurality of groups of four-bar mechanisms which have the same structure and are distributed along the circumferential direction, the top seat is fixedly connected with the upper end of the push rod, and the four-bar mechanism is hinged with the upper end of the frame and the top seat respectively; the method comprises the following steps:
the rotary driving device comprises a motor, a worm wheel, a worm, a first bevel gear, a second bevel gear, a first wheel shaft and a second wheel shaft, wherein the motor is fixed on the frame, the worm is coaxially and fixedly connected with a driving shaft of the motor, the first wheel shaft and the second wheel shaft are both axially and vertically connected on the frame, the worm wheel and the first bevel gear are respectively and fixedly connected with the first wheel shaft, the worm wheel is meshed with the worm, the second bevel gear is coaxially and fixedly connected with the second wheel shaft, and the second bevel gear is meshed with the first bevel gear;
the crank sliding block mechanism comprises a first sliding block, a first connecting rod and a second connecting rod, wherein the first sliding block is vertically matched with the slideway in a sliding way, the upper end of the first connecting rod is hinged with the first sliding block, the lower end of the first connecting rod is hinged with one end of the second connecting rod, and the other end of the second connecting rod is fixedly connected with the second wheel shaft;
the crank rocker mechanism comprises a second slide block, a third connecting rod, a fourth connecting rod, a fifth connecting rod, a sixth connecting rod and a seventh connecting rod, wherein the second slide block is vertically matched with the slide way in a sliding way and is positioned above the first slide block, the lower end of the third connecting rod is hinged with the second slide block, the upper end of the third connecting rod, one end of the fourth connecting rod, the lower end of the fifth connecting rod and the lower end of the sixth connecting rod are hinged, the other end of the fourth connecting rod is hinged on the frame, the upper end of the fifth connecting rod is hinged on the push rod, the upper end of the sixth connecting rod is hinged with one end of the seventh connecting rod, the other end of the seventh connecting rod is hinged to the frame, a spring is fixedly connected between the upper end of the fifth connecting rod and the other end of the seventh connecting rod, a cam seat is fixedly arranged on the frame, a cam shaft is connected to the cam seat in a shaft mode, a cam is fixedly arranged on the cam shaft, the cam shaft is linked with the first wheel shaft through a belt pulley assembly, when the crank rocker mechanism is at a top dead center position, the opening and closing mechanism is in a closed state, the cam is used for unlocking the top dead center state of the crank rocker mechanism, when the crank rocker mechanism is at a bottom dead center position, the opening and closing mechanism is in an open state, and the spring is used for unlocking the bottom dead center state of the crank rocker mechanism;
the four-bar linkage mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, wherein the lower end of the first connecting rod is hinged with the upper end of the frame, the upper end of the first connecting rod is hinged with the third connecting rod, the lower end of the second connecting rod is hinged with the first connecting rod, the upper end of the second connecting rod is hinged with the top seat, the lower end of the third connecting rod is hinged with the lower end of the fourth connecting rod, the upper end of the third connecting rod is a free end, and the upper end of the fourth connecting rod is hinged with the second connecting rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711427209.6A CN108022499B (en) | 2017-12-26 | 2017-12-26 | Open-close type mechanical principle demonstration teaching aid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711427209.6A CN108022499B (en) | 2017-12-26 | 2017-12-26 | Open-close type mechanical principle demonstration teaching aid |
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| CN108022499A CN108022499A (en) | 2018-05-11 |
| CN108022499B true CN108022499B (en) | 2023-11-14 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110215719A (en) * | 2018-08-21 | 2019-09-10 | 华强方特（深圳）科技有限公司 | A kind of mechanical structure of simulation feather folding |
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| CN108022499A (en) | 2018-05-11 |
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