CN103742616B - A kind of single groove Geneva mechanism for teaching demonstration - Google Patents
A kind of single groove Geneva mechanism for teaching demonstration Download PDFInfo
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- CN103742616B CN103742616B CN201410019122.5A CN201410019122A CN103742616B CN 103742616 B CN103742616 B CN 103742616B CN 201410019122 A CN201410019122 A CN 201410019122A CN 103742616 B CN103742616 B CN 103742616B
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- sheave
- pin
- groove
- lever
- hole
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H27/00—Step-by-step mechanisms without freewheel members, e.g. Geneva drives
- F16H27/04—Step-by-step mechanisms without freewheel members, e.g. Geneva drives for converting continuous rotation into a step-by-step rotary movement
- F16H27/06—Mechanisms with driving pins in driven slots, e.g. Geneva drives
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The present invention relates to a kind of single groove Geneva mechanism for teaching demonstration, this mechanism comprises sheave, linkage, bearing pin, mechanism rack; The average ratios of this teaching aid is 1:1, can realize the intermittently-driving of sheave simultaneously; In the past also can realize this function by Mechanism Combination, but this mechanism is more simple and reliable by contrast; Single groove sheave can be realized by the method for the forms of motion of amendment grooved, change straight pin, and the restriction that this has broken through original mechanism, more simplifies it; The model machine of this list groove sheave, can be used as the demonstration teaching aid about sheave in mechanical principle course, also can be for further study to single groove sheave, and then promote in work is used, have easy to operate, be convenient to the advantages such as demonstration.
Description
Technical field
The present invention relates to a kind of single groove Geneva mechanism, belong to teaching demonstration apparatus field, especially relate toAnd a kind of single groove Geneva mechanism for teaching demonstration.
Background technology
The intermittent motion mechanism that Geneva mechanism is made up of sheave and straight pin, claims again Malta machineStructure. It is often used to convert the continuous rotation of driving link to driven member unidirectional with what restPeriodic rotary. Geneva mechanism has external toothing and interior engagement and sphere sheave etc. External toothing grooveThe sheave of wheel mechanism and pivoted arm switched in opposite, interior engagement is identical, and sphere sheave can be in two-phaseBetween quadrature axis, carry out intermittently-driving.
Geneva mechanism has external toothing and two kinds of forms of interior engagement. The sheave of Sheave Device with the External Gear andPivoted arm switched in opposite, interior engagement is identical. Single armed Sheave Device with the External Gear is by with straight pinPivoted arm, the sheave with four radial slots and frame composition. When the circle on the pivoted arm of continuous rotationWhen pin enters radial slot, stir sheave turn over 2 toot 2 jiaos; When straight pin produces after radial slot,Sheave stops operating. Pivoted arm circles, sheave complete once turning stop transport moving. In order to ensure sheaveRest, can be on pivoted arm an affixed cutaway disk, the recessed periphery on its circumferential edge and sheave matches.Like this, neither affect pivoted arm and rotate, can pin sheave again motionless. For sheave can be completed weekThe stoppage in transit that turns of phase property is moved, and the radial slot number on sheave can not be less than 3. For fear of impact, cylinderPin should be tangentially into and out of sheave, and radial slot and pivoted arm are orthogonal at this instantaneous position. ?While meeting requiring of stopping between difference, can adopt multi-arm and Geneva mechanism asymmetric groove. SheaveMechanism be generally applied in rotating speed not high, require turn over off and in the indexing means of certain angle,As in the cutter indexing mechanism on capstan lathe, cinematographic projector in order to intermittent movement film etc.
Existing sheave groove number is at least 3, and kinematic coefficient is coincidence formula also: k=td/t=1/2-1/z is due to k>0, therefore groove is counted z>=3; Again because of k<0.5, therefore the groove of single cotter way wheel mechanismThe run duration of wheel is always less than its quiescent time. If sheave groove number can be less than 3 and break through formerCome moving stop than restriction, sheave will have more wide utilization space, as realizes the different moving ratios that stopsAdapt to different job requirement (k can equal to be even greater than 0.5).
Summary of the invention
The object of the present invention is to provide a kind of single groove Geneva mechanism for teaching demonstration, logicalCross the cooperation of sheave and slider-crank mechanism and design a kind of single groove sheave, this list groove sheave machineStructure is expanded and has been deepened the research of traditional sheave and other indexing mechanism, and Machine Design,The classroom instruction aspect of theory of mechanics is also a kind of well teaching aid, and it is to promoting sheave machineThe application of structure in actual production, has boundless perspective.
For achieving the above object, the technical solution used in the present invention is a kind of for teaching demonstrationSingle groove Geneva mechanism, this mechanism comprises sheave, linkage, bearing pin, mechanism rack.
Particularly, sheave comprises sheave kingpin hole, sheave arc notch, sheave groove;Linkage comprises driving lever, follower lever, throw-out lever; Bearing pin comprise bearing pin a, bearing pin b,Bearing pin c; Mechanism rack comprises mechanism rack pin-and-hole a, mechanism rack pin-and-hole b, mechanism rack groove; InitiativelyBar two ends are respectively equipped with driving lever pin-and-hole a, driving lever pin-and-hole b; Follower lever two ends are respectively equipped withFollower lever pin-and-hole, straight pin; Throw-out lever one end is provided with throw-out lever pin-and-hole, the other end be arc andMate with sheave arc notch; Sheave kingpin hole, mechanism rack pin-and-hole b pass through bearing pin b by grooveWheel is connected in mechanism rack; Driving lever pin-and-hole a, mechanism rack pin-and-hole a, throw-out lever pin-and-hole pass throughBearing pin a is connected to driving lever, throw-out lever in mechanism rack; Driving lever pin-and-hole b, driven lever pinHole links together driving lever, follower lever by bearing pin c; Straight pin on follower lever and grooveWheel groove, mechanism rack groove match.
When this list groove Geneva mechanism motion, the sheave arc notch of the arc tips of throw-out lever and sheaveDo not contact, now whole mechanism is duty; Driving lever is driven with bearing pin a by driving mechanismCentered by circle, follower lever is driven by driving lever by bearing pin c; The cylinder of follower leverPin drives sheave to circle centered by bearing pin b in sheave groove; When sheave moves toWhen sheave groove is connected with mechanism rack groove, the straight pin access mechanism frame groove of follower lever, thisTime straight pin moving linearly in mechanism rack groove; Driving lever continues to drive follower lever motion,Now straight pin returns in sheave groove along mechanism rack groove; Then drive sheave to continue to do circumferenceMove, so far complete the circular motion at once intermittence of sheave.
In the time that the arc tips of throw-out lever and the sheave arc notch of sheave contact, sheave can not be transportedMoving, now whole mechanism is lock-out state.
The length of described mechanism rack groove is more than or equal to driving lever+follower lever-(mechanism rack pin-and-hole a-Mechanism rack pin-and-hole b)-sheave radius.
Throw-out lever can or be made circumference with driving lever for free movable part centered by bearing pin aMotion.
Described driving mechanism can be manual or motor drives.
Described mechanism rack groove can be skewed slot, and now mechanism only has one-way movement characteristic.
Compared with prior art, the present invention has following beneficial effect.
1, the average ratios of this teaching aid is 1:1, can realize the intermittence of sheave simultaneouslyTransmission.
2, in the past also can realize this function by Mechanism Combination, but this mechanism by contrastMore simple and reliable; Single groove sheave is by the method for the forms of motion of amendment grooved, change straight pinCan realize, the restriction that this has broken through original mechanism, more simplifies it.
3, the model machine of this list groove sheave, can be used as drilling about sheave in mechanical principle courseDisplay teaching aid, also can be for further study to single groove sheave, and then promote in work is used,Have easy to operate, be convenient to the advantages such as demonstration.
Brief description of the drawings
Fig. 1 is the motion structure schematic diagram of single groove Geneva mechanism.
Fig. 2 is the structure chart of sheave.
Fig. 3 is the top view of driving lever.
Fig. 4 is the top view of follower lever.
Fig. 5 is the cutaway view of follower lever.
Fig. 6 is the cutaway view of throw-out lever.
Fig. 7 is the top view of throw-out lever.
Fig. 8 is the top view of mechanism rack.
Fig. 9 .1 is movement position I schematic diagram.
Fig. 9 .2 is movement position II schematic diagram.
Fig. 9 .3 is movement position III schematic diagram.
Fig. 9 .4 is movement position IV schematic diagram.
Fig. 9 .5 is movement position V schematic diagram.
Fig. 9 .6 is throw-out lever schematic diagram.
In figure: 1, sheave, 2, driving lever, 3, follower lever, 4, throw-out lever; 5, bearing pinComprise bearing pin a, 6, bearing pin b, 7, bearing pin c; 8, mechanism rack, 1.1, sheave centrepinHole, 1.2, sheave arc notch, 1.3, sheave groove, 2.1, driving lever pin-and-hole a, 2.2,Driving lever pin-and-hole b, 3.1, follower lever pin-and-hole, 3.2, straight pin, 4.1, throw-out lever pin-and-hole,8.1, mechanism rack pin-and-hole a, 8.2, mechanism rack pin-and-hole b, 8.3, mechanism rack groove.
Detailed description of the invention
Below with reference to accompanying drawing, the invention will be further described.
As shown in Fig. 1-8, a kind of single groove Geneva mechanism for teaching demonstration, this mechanism comprisesSheave 1, linkage, bearing pin, mechanism rack 8.
Particularly, sheave 1 comprises sheave kingpin hole 1.1, sheave arc notch 1.2, grooveWheel groove 1.3; Linkage comprises driving lever 2, follower lever 3, throw-out lever 4; Bearing pin comprisesBearing pin a5, bearing pin b6, bearing pin c7; Mechanism rack 8 comprises mechanism rack pin-and-hole a8.1, mechanism rackPin-and-hole b8.2, mechanism rack groove 8.3; Driving lever 2 two ends be respectively equipped with driving lever pin-and-hole a2.1,Driving lever pin-and-hole b2.2; Follower lever 3 two ends are respectively equipped with follower lever pin-and-hole 3.1, straight pin 3.2;Throw-out lever 4 one end are provided with throw-out lever pin-and-hole 4.1, the other end be arc and with sheave arc notch1.2 coupling; Sheave kingpin hole 1.1, mechanism rack pin-and-hole b8.2 pass through bearing pin b6 by sheave 1Be connected in mechanism rack 8; Driving lever pin-and-hole a2.1, mechanism rack pin-and-hole a8.1, throw-out lever pin-and-hole4.1 are connected to driving lever 2, throw-out lever 4 in mechanism rack 8 by bearing pin a5; Initiatively lever pinHole b2.2, follower lever pin-and-hole 3.1 are connected to one by bearing pin c7 by driving lever 2, follower lever 3Rise; Straight pin 3.2 on follower lever 3 matches with sheave groove 1.3, mechanism rack groove 8.3.
When this list groove Geneva mechanism motion, the sheave arc of the arc tips of throw-out lever 4 and sheave 1Breach 1.2 does not contact, and now whole mechanism is duty; Driving lever 2 is driven by driving mechanismMove and circle centered by bearing pin a5, follower lever 3 is with by driving lever 2 by bearing pin c7Moving; The straight pin 3.2 of follower lever 3 the interior driving sheave 1 of sheave groove 1.3 taking bearing pin b6 asCenter circles; When moving to sheave groove 1.3, sheave 1 connects with mechanism rack groove 8.3While connecing, the straight pin 3.2 access mechanism frame grooves 8.3 of follower lever 3, now straight pin 3.2 existsThe interior moving linearly of mechanism rack groove 8.3; Driving lever 2 continues to drive follower lever 3 to move, thisTime straight pin 3.2 return in sheave groove 1.3 along mechanism rack groove 8.3; Then drive sheave 1Continue to circle, so far complete the circular motion at once intermittence of sheave 1.
In the time that the arc tips of throw-out lever 4 and the sheave arc notch 1.2 of sheave 1 contact, sheave1 can not move, and now whole mechanism is lock-out state.
The length of described mechanism rack groove 8.3 is more than or equal to driving lever+follower lever-(mechanism rack pinHole a8.1-mechanism rack pin-and-hole b8.2)-sheave radius.
Be arranged in bearing pin a5, bearing pin b6 in frame 8 and the center line of mechanism rack groove 8.3In alignment; This device has bidirectional-movement characteristic simultaneously.
Throw-out lever 4 can or be done centered by bearing pin a5 with driving lever 2 for free movable partCircular motion.
Described driving mechanism can be manual or motor drives.
As shown in Fig. 9 .1-9.5, be respectively movement position I of the present invention, movement position II, fortuneMoving position III, movement position IV, movement position V schematic diagram, driving lever 2 rotates counterclockwise,Drive the straight pin 3.2 on follower lever 3 to move along mechanism rack groove 8.3 at sheave groove 1.3,Thereby complete the intermittent movement process of whole mechanism.
As Fig. 9 .6 is depicted as throw-out lever schematic diagram, when sheave 1 is lived in throw-out lever 4 thrusts, wholeMechanism is lockable.
Described mechanism rack groove can be skewed slot, and now mechanism only has one-way movement characteristic.
Claims (6)
1. for a single groove Geneva mechanism for teaching demonstration, it is characterized in that: this mechanism comprises grooveWheel (1), linkage, bearing pin, mechanism rack (8);
Particularly, sheave (1) comprise sheave kingpin hole (1.1), sheave arc notch (1.2),Sheave groove (1.3); Linkage comprises driving lever (2), follower lever (3), throw-out lever (4);Bearing pin comprises bearing pin a (5), bearing pin b (6), bearing pin c (7); Mechanism rack (8) comprises machineFramework pin-and-hole a (8.1), mechanism rack pin-and-hole b (8.2), mechanism rack groove (8.3); Driving lever(2) two ends are respectively equipped with driving lever pin-and-hole a (2.1), driving lever pin-and-hole b (2.2); Follower lever(3) two ends are respectively equipped with follower lever pin-and-hole (3.1), straight pin (3.2); Throw-out lever (4) oneEnd is provided with throw-out lever pin-and-hole (4.1), and the other end is arc and mates with sheave arc notch (1.2);Sheave kingpin hole (1.1), mechanism rack pin-and-hole b (8.2) pass through bearing pin b (6) by sheave (1)Be connected in mechanism rack (8); Driving lever pin-and-hole a (2.1), mechanism rack pin-and-hole a (8.1), onlyPush rod pin-and-hole (4.1) is connected to machine by bearing pin a (5) by driving lever (2), throw-out lever (4)On framework (8); Driving lever pin-and-hole b (2.2), follower lever pin-and-hole (3.1) are by bearing pin c (7)Driving lever (2), follower lever (3) are linked together; Straight pin (3.2) on follower lever (3)Match with sheave groove (1.3), mechanism rack groove (8.3);
When this list groove Geneva mechanism motion, the sheave of the arc tips of throw-out lever (4) and sheave (1)Arc notch (1.2) does not contact, and now whole mechanism is duty; Driving lever (2) is by drivingMechanism drives and circles centered by bearing pin a (5), and follower lever (3) is by bearing pin c (7)Driven by driving lever (2); The straight pin (3.2) of follower lever (3) is in sheave groove (1.3)Drive sheave (1) to circle centered by bearing pin b (6); When sheave (1) moves to grooveWhen wheel groove (1.3) is connected with mechanism rack groove (8.3), the straight pin (3.2) of follower lever (3)Access mechanism frame groove (8.3), now straight pin (3.2) is done directly in mechanism rack groove (8.3)Line motion; Driving lever (2) continues to drive follower lever (3) motion, now straight pin (3.2) edgeMechanism rack groove (8.3) returns in sheave groove (1.3); Then drive sheave (1) to continue to doCircular motion, so far completes the once circular motion intermittently of sheave (1).
2. a kind of single groove Geneva mechanism for teaching demonstration according to claim 1, its spyLevy and be: when the arc tips of throw-out lever (4) and the sheave arc notch (1.2) of sheave (1) connectWhile touching, sheave (1) can not move, and now whole mechanism is lock-out state.
3. a kind of single groove Geneva mechanism for teaching demonstration according to claim 1, its spyLevy and be: be arranged in bearing pin a (5), bearing pin b (6) in mechanism rack (8) recessed with mechanism rackThe center line of groove (8.3) is in alignment; Described single groove Geneva mechanism has bidirectional-movement spy simultaneouslyProperty.
4. a kind of single groove Geneva mechanism for teaching demonstration according to claim 1, its spyLevy and be: throw-out lever (4) for free movable part or with driving lever (2) taking bearing pin a (5) asCenter circles.
5. a kind of single groove Geneva mechanism for teaching demonstration according to claim 1, its spyLevy and be: described driving mechanism is manual or motor driving.
6. a kind of single groove Geneva mechanism for teaching demonstration according to claim 1, its spyLevy and be: described mechanism rack groove is skewed slot, now described single groove Geneva mechanism only has unidirectional fortuneDynamic characteristic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410019122.5A CN103742616B (en) | 2014-01-15 | 2014-01-15 | A kind of single groove Geneva mechanism for teaching demonstration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410019122.5A CN103742616B (en) | 2014-01-15 | 2014-01-15 | A kind of single groove Geneva mechanism for teaching demonstration |
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| Publication Number | Publication Date |
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| CN103742616A CN103742616A (en) | 2014-04-23 |
| CN103742616B true CN103742616B (en) | 2016-05-18 |
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| CN201410019122.5A Expired - Fee Related CN103742616B (en) | 2014-01-15 | 2014-01-15 | A kind of single groove Geneva mechanism for teaching demonstration |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104217640B (en) * | 2014-09-04 | 2016-08-17 | 浙江大学 | A kind of teaching electronic sheave laboratory table |
| CN106763606B (en) * | 2016-12-06 | 2023-09-26 | 昆明理工大学 | Outer sheave mechanism with multiple stop-and-go ratios and use method thereof |
| CN107514875B (en) * | 2017-07-20 | 2020-08-21 | 江苏中聚检测服务有限公司 | Electrothermal blowing drying equipment with good drying effect and control system thereof |
| CN107931704A (en) * | 2017-11-16 | 2018-04-20 | 宁波市鄞州堃信工业产品设计有限公司 | A kind of transmission mechanism of pipe cutter |
| CN109826920B (en) * | 2019-02-27 | 2021-06-25 | 长沙理工大学 | Design method of sheave mechanism with uniformly distributed grooves and non-uniformly distributed pins |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5334058A (en) * | 1976-09-10 | 1978-03-30 | Fujitsu Ltd | Intermittent motion mechanism |
| US5080636A (en) * | 1991-01-22 | 1992-01-14 | Theodore Weber | Intermittent motion drive assembly |
| CN200996454Y (en) * | 2007-01-13 | 2007-12-26 | 王仲珏 | Differential gear reducer in grinding ball continuous-casting production line |
| CN201973224U (en) * | 2011-02-25 | 2011-09-14 | 上海中科深江电动车辆有限公司 | Gear-shifting execution mechanism for electrically-controlled mechanical type two-gear automatic transmission of electric automobile |
| CN102853049A (en) * | 2012-08-21 | 2013-01-02 | 赵轩 | Two-way intermittent geneva mechanism |
-
2014
- 2014-01-15 CN CN201410019122.5A patent/CN103742616B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5334058A (en) * | 1976-09-10 | 1978-03-30 | Fujitsu Ltd | Intermittent motion mechanism |
| US5080636A (en) * | 1991-01-22 | 1992-01-14 | Theodore Weber | Intermittent motion drive assembly |
| CN200996454Y (en) * | 2007-01-13 | 2007-12-26 | 王仲珏 | Differential gear reducer in grinding ball continuous-casting production line |
| CN201973224U (en) * | 2011-02-25 | 2011-09-14 | 上海中科深江电动车辆有限公司 | Gear-shifting execution mechanism for electrically-controlled mechanical type two-gear automatic transmission of electric automobile |
| CN102853049A (en) * | 2012-08-21 | 2013-01-02 | 赵轩 | Two-way intermittent geneva mechanism |
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| CN103742616A (en) | 2014-04-23 |
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