CN204117439U - Moment of inertia teaching aid instrument - Google Patents
Moment of inertia teaching aid instrument Download PDFInfo
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- CN204117439U CN204117439U CN201420466596.XU CN201420466596U CN204117439U CN 204117439 U CN204117439 U CN 204117439U CN 201420466596 U CN201420466596 U CN 201420466596U CN 204117439 U CN204117439 U CN 204117439U
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Abstract
Moment of inertia teaching aid instrument, base is provided with emitter, swing angle detection device.Basic ideas of the present utility model are realized by the knowledge point of " conservation of angular momentum ".By launching experiment bead, the V-arrangement baffle plate of rotatable platform is subject to testing the impact of bead and rotates, rotatable platform because of the characteristic of the different moment of inertia of detection thing be fixed thereon be certain angular velocity rotation, the unidirectional swing arm record maximum pendulum angle be fixed thereon.According to the conversion relation between moment of inertia and pivot angle, the relation that the size of the moment of inertia of the thing to be detected that the pivot angle of known unidirectional swing arm and rotatable platform are installed roughly is inversely proportional to.Thus the size of moment of inertia is indirectly reflected by measuring pivot angle size.
Description
Technical field
The utility model belongs to teaching aid apparatus, particularly moment of inertia teaching aid instrument.
Background technology
Moment of inertia is rigid body the measuring of inertia when swaying.Its value depends on the position of the shape of object, mass distribution and rotating shaft, and has nothing to do with the rotary state of rigid body around axle.The moment of inertia of rigid body has important physical significance, is also an Important Parameters at industrial circles such as scientific experiment, engineering, space flight, electric power, machinery, instrument.
The method measuring solid moment of inertia is a lot, conventional has three-line pendulum, rocks, physical pendulum etc.But on classroom, moment of inertia is explained, go back neither one teaching aid intuitively.
Summary of the invention
For solving the deficiency that prior art does not have easy apparatus to impart knowledge to students to moment of inertia, a kind of moment of inertia teaching aid instrument is provided, the moment of inertia that this teaching aid instrument is easy to operate, rational in infrastructure, can reflect different objects intuitively, by allowing the undergoing and participate in enlivening classroom atmosphere, improve Students ' Learning enthusiasm, consolidate this knowledge point of moment of inertia of student.
For solving the problem, the utility model by the following technical solutions:
Moment of inertia teaching aid instrument, comprises base, and base is provided with emitter, swing angle detection device;
Emitter comprises the ejection platform be arranged on base, ejection platform is provided with line slide rail and ejection orbit, line slide rail is provided with and launches contactor, rear end cover line slide rail launching contactor has transmitting spring, there is damping spring at its front end sleeve, be fixed with handle launching on contactor, ejection platform is provided with wedge shape screens block, be fixedly connected with a slide bar at wedge shape screens block, between ejection platform and slide bar, back-moving spring be installed;
Be provided with swing angle detection device in ejection platform front end, swing angle detection device comprises rotatable platform, and rotatable platform is installed on base by bearing; Rotatable platform is provided with V-arrangement baffle plate, is vertically provided with fixed bar, fixed bar is provided with swing arm by unilateral bearing, be fixed with swing ball at swing arm end at the axle center place of rotatable platform, fixed bar is provided with pivot angle graduation apparatus on the pendulum face of swing arm; Circular rotatable inertia is installed at the axle center place of rotatable platform and detects thing.
Above-mentioned moment of inertia teaching aid instrument, several rotatable platforms are fixed on transverse arm respectively by bearing, and all transverse arms and a rotating shaft are fixed, and rotating shaft is connected by bearing with base; Base is provided with driver plate, and driver plate is connected with motor; The rotating shaft of rotatable platform is fixed with the sheave coordinated with driver plate; Driver plate is divided into semilune boss and reversed column, and groove cam lobe quantity is consistent with rotatable platform quantity, and its salient angle offers along radial the groove coordinated with reversed column, and the outer circumferential edge of the concave edge of groove cam lobe and the semilune boss of driver plate is inconsistent; The circle detection thing with different moment of inertia is installed in different rotatable platform axle center;
Locating notch offered by rotatable platform, be provided with ball push rod at locating notch place, ball push rod is coordinated by chute rail structure with ball slide rail, and ball slide rail is installed on transverse arm, base is fixed with lifting skewback, and ball push rod lower end to be contacted with lifting skewback by pulley and coordinates; When ball push rod lower end contacts with rising skewback, the location fin of ball push rod departs from from the indentation, there of rotatable platform, and now rotatable platform is free to rotate, and meanwhile V-arrangement baffle plate is positioned at ejection orbit dead ahead just.
Above-mentioned moment of inertia teaching aid instrument, also comprise retracting device, retracting device comprises the funnel being installed on rotatable platform side, ejection orbit front, the recovery track communicated with funnel is connected in funnel lower end, reclaim track other end to be connected with a jacking gear, reclaim track to tilt to jacking gear from funnel, send the experiment bead of recovery back to ejection orbit by jacking gear.
Above-mentioned moment of inertia teaching aid instrument, described jacking gear comprises the upright slide rail be arranged on base, and slide rail is provided with slide block, and slide block is connected with a screw rod, and screw rod is connected with motor, and slide block is provided with experiment bead and reclaims cavity volume; When electric motor driven screw rotates, when band movable slider drops to bottom, experiment bead reclaims cavity volume and reclaims track and is in same plane, and reclaims cavity volume lower than recovery track, to ensure that experiment bead falls into recovery cavity volume by Action of Gravity Field from recovery track; Ejection platform is fixed with experiment bead and receives track, this track reclaims cavity volume with the experiment bead of jacking gear and connects, and lower than recovery cavity volume, the reception track of testing bead, again higher than ejection orbit, can make experiment bead fall into reception track by Action of Gravity Field and fall into ejection orbit more simultaneously.
Above-mentioned moment of inertia teaching aid instrument, described emitter is provided with fixture block support below ejection platform, launches pull bar be fixedly connected with for the slide bar lower end of installing back-moving spring through the through hole and of fixture block pedestal lower end.
The basic ideas of moment of inertia teaching aid instrument are realized by the knowledge point of " conservation of angular momentum ".By launching experiment bead, the V-arrangement baffle plate of rotatable platform is subject to the impact of experiment bead and rotates, and rotatable platform forms certain angular velocity, and record is to the maximum pendulum angle of swing arm.According to the conversion relation between moment of inertia and pivot angle, the relation that the size of the moment of inertia of the thing to be detected that the pivot angle of known unidirectional swing arm and rotatable platform are installed roughly is inversely proportional to.
The utility model is the size indirectly being reflected moment of inertia by the pivot angle size of measurement swing arm.
Accompanying drawing explanation
Fig. 1 is the utility model one-piece construction schematic diagram.
Fig. 2 is the structural representation after the utility model catapult-launching gear launches.
Fig. 3 is the structural representation that the utility model catapult-launching gear launches front kayser state.
Fig. 4 is the structural representation of the utility model driver plate when not working.
Fig. 5 is the structural representation of the utility model driver plate when stirring the sheave of rotatable platform.
Structural representation when Fig. 6 is the lifting of the utility model swing angle detection device.
Structural representation when Fig. 7 is the non-lifting of the utility model swing angle detection device.
Structural representation when Fig. 8 is the lifting of the utility model rotatable platform.
Structural representation when Fig. 9 is the non-lifting of the utility model rotatable platform.
This structural representation for utility model recovery jacking gear of Figure 10.
Figure 11 is the structural representation of the utility model ball push rod.
Figure 12 is the backsight structural representation that the utility model reclaims jacking gear.
Figure 13 be the utility model reclaim jacking gear face structural representation.
Be labeled as in figure: 1 base, 11 handles, 12 launch contactor, 13 wedge shape fixture blocks, 14 line slide rails, 15 ejection orbits, and 16 launch spring, 17 damping springs, 18 back-moving springs, 19 slide bars, and 191 launch pull bar, 192 fixture block supports, 111 ejection platform, 210, 220, 230 pivot angle graduation apparatus, 2100, 2200, fixed bar on 2300 rotatable platforms, 211, 221, 231 swing arms, 212, 222, 232 circular rotatable inertia detect thing, and 213, 223, 233V shape catch, 214, 224, 234 transverse arms, 215, 225, 235 pulleys, 216, 226, 236 rotatable platforms, 217, 227, 237 swing balls, 218 ball slide rails, 219, 239 ball push rods, 2199 locating notches, 4 lifting skewbacks, 51 reclaim funnel, and 52 reclaim track, 53 lifting screws, 54 motors, 55 slide blocks, 56 reclaim cavity volume, 57 receive track, 58 spacing backup plates, 59 lifting motor fixed heads, 6 driver plates, the semilune boss of 61 driver plates, 62 driving levers, 63 rotating shafts, 64 sheaves, the radial fluting in 65 sheave salient angles.
Embodiment
Embodiment one
Moment of inertia teaching aid instrument, comprises base 1, and base is provided with emitter, swing angle detection device;
Emitter comprises the ejection platform 111 be arranged on base, ejection platform is provided with line slide rail 14 and ejection orbit 15, line slide rail is provided with and launches contactor 12, rear end cover line slide rail launching contactor has launches spring 16, damping spring 17 is had at its front end sleeve, be fixed with handle 11 launching on contactor, ejection platform is provided with wedge shape screens block 13, be fixedly connected with a slide bar 19 at wedge shape screens block, fixture block support 192 is installed below ejection platform, launch pull bar 191 for the slide bar lower end of installing back-moving spring through the through hole and of fixture block pedestal lower end to be fixedly connected with, back-moving spring 18 is had to be set in outside slide bar 19.
Be provided with swing angle detection device in ejection platform front end, single swing angle detection device comprises a rotatable platform 216; Rotatable platform is provided with V-arrangement baffle plate 213, at the axle center place of rotatable platform, fixed bar 2100 is vertically installed, fixed bar is provided with swing arm 211 by unilateral bearing, is fixed with swing ball 217 at swing arm end, fixed bar is provided with pivot angle graduation apparatus 210 on the pendulum face of swing arm; Circular rotatable inertia is installed at the axle center place of rotatable platform and detects thing 212.
The present embodiment comprises three swing angle detection devices, and the rotatable platform of these three swing angle detection devices is fixed on transverse arm 214,224,234 respectively by bearing, and three transverse arms and a rotating shaft 63 are fixed, and rotating shaft is connected by bearing with base 1; Base is provided with driver plate 6, and driver plate is connected with motor; In the rotating shaft of rotatable platform, 63 are fixed with the sheave 64 coordinated with driver plate; Driver plate is divided into semilune boss 61 and reversed column 62.In this example, groove cam lobe quantity is consistent with rotatable platform quantity, is three, and sheave salient angle offers along radial the groove 65 coordinated with reversed column, and the outer circumferential edge of the concave edge of groove cam lobe and the semilune boss 61 of driver plate is inconsistent; The circle detection thing 212,222,232 with different moment of inertia is installed in different rotatable platform axle center;
Locating notch 2199 offered by rotatable platform, at locating notch place, ball push rod 219 is installed, ball push rod is coordinated by chute rail structure with ball slide rail 218, ball slide rail is installed on transverse arm 214, base is fixed with lifting skewback 4, and ball push rod lower end is contacted with lifting skewback by pulley 215 and coordinates; When ball push rod lower end contacts with rising skewback, the location fin of ball push rod departs from from the indentation, there of rotatable platform, and such rotatable platform is free to rotate, and meanwhile V-arrangement baffle plate is positioned at ejection orbit dead ahead just.
Also comprise a retracting device, retracting device comprises the funnel 51 being installed on rotatable platform side, ejection orbit front, the recovery track 52 communicated with funnel is connected in funnel lower end, reclaim track other end to be connected with a jacking gear, reclaim track to tilt to jacking gear from funnel, send the experiment bead of recovery back to ejection orbit by jacking gear.
Jacking gear comprises the spacing backup plate 58 be arranged on base, and lifting screw is provided with slide block 55, and slide block 55 is rotated by unlikely on the flat vertical end face leaning against spacing backup plate 58, thus slide block can slide up and down because of bolt rotary; Screw rod and motor are connected with a joggle by gear pair, and slide block is provided with experiment bead and reclaims cavity volume 56; When electric motor driven screw rotates, when band movable slider drops to bottom, experiment bead reclaims cavity volume and reclaims track and is in same plane, and reclaims cavity volume lower than recovery track, to ensure that experiment bead falls into recovery cavity volume by Action of Gravity Field from recovery track; Ejection platform is fixed with experiment bead and receives track 57, this reception track reclaims cavity volume with the experiment bead of jacking gear and connects, and lower than recovery cavity volume, the reception track 57 of simultaneously testing bead, again higher than ejection orbit 15, can make experiment bead fall into reception track by Action of Gravity Field and fall into ejection orbit again.
Whole retracting device, recovery track, the experiment bead be connected with slide block reclaim cavity volume, receive track, ejection orbit, head and the tail mutual connection, and install from high to low, like this, experiment bead according to Action of Gravity Field, can be slided from this high one end of funnel and is finally slipped in ejection orbit, to launch next time.
Experiment bead is placed on ejection orbit, again the handle of emitter is pulled back, launch contactor to block mutually with wedge shape fixture block, pull bar is launched in release, drop-down by it, wedge shape fixture block is followed and is moved down, when on wedge shape fixture block, end face flushes with ejection platform upper surface, launch contactor and depart from wedge shape fixture block, transmitting spring will launch contactor and eject forward, ejected forward by the experiment bead being positioned at ejection orbit, after launching contactor ejection, wedge shape fixture block is upwards ejected ejection platform upper surface and resets by back-moving spring.
Three are provided with the rotatable platform that different moment of inertia detects thing, can by V-arrangement block accept experiment bead launch shock three times, rotatable platform rotates after being impacted, the swing arm be installed on it is by the effect of unilateral bearing, swing arm will stop at maximum pendulum angle, and this pivot angle has reacted the size of moment of inertia.By by swing arm to sense of rotation hand-turning, can reset to swing arm, for the shock record of next time.
By the reversed column of driver plate, realize the transposition of three being rotated to detection platform.Driver plate rotates, reversed column snaps in the fluting of sheave, drive sheave rotates, drive the rotation of rotatable platform simultaneously, the pulley of rotatable platform ball push rod lower end contacts with lifting skewback, lifting skewback is by spin push rod along ball slide rail upwards jack-up, and the location fin of ball push rod is separated with the locating notch of rotatable platform, and rotatable platform can freely be rotated.
When ball push rod location fin is separated with locating notch, V-arrangement block is positioned at the dead ahead of ejection orbit just, and now V-arrangement block can be used for the frontal impact of the experiment bead accepting to launch out.And now reversed column also departs from just from the fluting of sheave, the side of the semilune boss of driver plate and the side of sheave salient angle inconsistent, the rotation error forward of driver plate does not cause sheave to be rotated further, and this ensure that V-arrangement block and ejection orbit remain on straight line.And driver plate next time to the drive of sheave, can make again next rotatable platform V-arrangement block aim at ejection orbit.
The recovery track at Binding protein inclination angle, can repeat to launch experiment bead, detects the moment of inertia of thing and the corresponding experimental data of pivot angle to obtain three.
Claims (5)
1. moment of inertia teaching aid instrument, comprises base, it is characterized in that on base, be provided with emitter, swing angle detection device;
Emitter comprises the ejection platform be arranged on base, ejection platform is provided with line slide rail and ejection orbit, line slide rail is provided with and launches contactor, rear end cover line slide rail launching contactor has transmitting spring, there is damping spring at its front end sleeve, be fixed with handle launching on contactor, ejection platform is provided with wedge shape screens block, be fixedly connected with a slide bar at wedge shape screens block, between ejection platform and slide bar, back-moving spring be installed;
Be provided with swing angle detection device in ejection platform front end, swing angle detection device comprises rotatable platform, and rotatable platform is installed on base by bearing; Rotatable platform is provided with V-arrangement baffle plate, is vertically provided with fixed bar, fixed bar is provided with swing arm by unilateral bearing, be fixed with swing ball at swing arm end at the axle center place of rotatable platform, fixed bar is provided with pivot angle graduation apparatus on the pendulum face of swing arm; Circular rotatable inertia is installed at the axle center place of rotatable platform and detects thing.
2. moment of inertia teaching aid instrument as claimed in claim 1, it is characterized in that several rotatable platforms are fixed on transverse arm respectively by bearing, all transverse arms and a rotating shaft are fixed, and rotating shaft is connected by bearing with base; Base is provided with driver plate, and driver plate is connected with motor; The rotating shaft of rotatable platform is fixed with the sheave coordinated with driver plate; Driver plate is divided into semilune boss and reversed column, and groove cam lobe quantity is consistent with rotatable platform quantity, and its salient angle offers along radial the groove coordinated with reversed column, and the outer circumferential edge of the concave edge of groove cam lobe and the semilune boss of driver plate is inconsistent; The circle detection thing with different moment of inertia is installed in different rotatable platform axle center;
Locating notch offered by rotatable platform, be provided with ball push rod at locating notch place, ball push rod is coordinated by chute rail structure with ball slide rail, and ball slide rail is installed on transverse arm, base is fixed with lifting skewback, and ball push rod lower end to be contacted with lifting skewback by pulley and coordinates; When ball push rod lower end contacts with rising skewback, the fin of ball push rod departs from from the indentation, there of rotatable platform, and now rotatable platform is free to rotate, and meanwhile V-arrangement baffle plate is positioned at ejection orbit dead ahead just.
3. moment of inertia teaching aid instrument as claimed in claim 1, characterized by further comprising retracting device, retracting device comprises the funnel being installed on rotatable platform side, ejection orbit front, the recovery track communicated with funnel is connected in funnel lower end, reclaim track other end to be connected with a jacking gear, reclaim track to tilt to jacking gear from funnel, send the experiment bead of recovery back to ejection orbit by jacking gear.
4. moment of inertia teaching aid instrument as claimed in claim 3, it is characterized in that described jacking gear comprises the upright slide rail be arranged on base, slide rail is provided with slide block, slide block is connected with a screw rod, screw rod is connected with motor, and slide block is provided with experiment bead and reclaims cavity volume; When electric motor driven screw rotates, when band movable slider drops to bottom, experiment bead reclaims cavity volume and reclaims track and is in same plane, and reclaims cavity volume lower than recovery track, to ensure that experiment bead falls into recovery cavity volume by Action of Gravity Field from recovery track; Ejection platform is fixed with experiment bead and receives track, this track reclaims cavity volume with the experiment bead of jacking gear and connects, and lower than recovery cavity volume, the reception track of testing bead, again higher than ejection orbit, can make experiment bead fall into reception track by Action of Gravity Field and fall into ejection orbit more simultaneously.
5. moment of inertia teaching aid instrument as claimed in claim 1, is characterized in that described emitter is provided with fixture block support below ejection platform, launches pull bar be fixedly connected with for the slide bar lower end of installing back-moving spring through the through hole and of fixture block pedestal lower end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420466596.XU CN204117439U (en) | 2014-08-19 | 2014-08-19 | Moment of inertia teaching aid instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420466596.XU CN204117439U (en) | 2014-08-19 | 2014-08-19 | Moment of inertia teaching aid instrument |
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| CN204117439U true CN204117439U (en) | 2015-01-21 |
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| CN201420466596.XU Active CN204117439U (en) | 2014-08-19 | 2014-08-19 | Moment of inertia teaching aid instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104346977A (en) * | 2014-08-19 | 2015-02-11 | 浙江工业大学 | Rotary inertia teaching instrument |
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2014
- 2014-08-19 CN CN201420466596.XU patent/CN204117439U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104346977A (en) * | 2014-08-19 | 2015-02-11 | 浙江工业大学 | Rotary inertia teaching instrument |
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