CN107045822A - Demonstrate the physical teaching aid of natural frequency of object and compare the method for different metal bar intrinsic frequency - Google Patents
Demonstrate the physical teaching aid of natural frequency of object and compare the method for different metal bar intrinsic frequency Download PDFInfo
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- CN107045822A CN107045822A CN201710249402.9A CN201710249402A CN107045822A CN 107045822 A CN107045822 A CN 107045822A CN 201710249402 A CN201710249402 A CN 201710249402A CN 107045822 A CN107045822 A CN 107045822A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 24
- 239000002184 metal Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000003321 amplification Effects 0.000 claims abstract description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 description 9
- 230000003028 elevating effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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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
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
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Abstract
The present invention provides a kind of physical teaching aid for demonstrating natural frequency of object and the method for comparing different metal bar intrinsic frequency, effectively solve intrinsic frequency apparatus for demonstrating of the prior art low using precision is visually observed, it is impossible to the problem of the size of the intrinsic frequency between significant difference different workpieces.1）One end of bonding jumper is clamped, the other end carries out exciting using exciting device to it；2）The vibration of bonding jumper is unidirectionally amplified, can be unidirectional amplification upwards or unidirectional amplification downwards；3）Amplitude after amplification is converted into linear motion, and then drives laser pen to be projected towards scale plate；4）The maximum scale that laser pen is finally cast out is the peak swing of bonding jumper, and the frequency of corresponding exciting device is the intrinsic frequency of bonding jumper, records intrinsic frequency now；5）The bonding jumper of different cross section is subjected to above-mentioned steps successively, its intrinsic frequency is compared.
Description
Technical field
The present invention relates to physical teaching aid, particularly a kind of physical teaching aid for demonstrating natural frequency of object and compare different metal
The method of bar intrinsic frequency.
Background technology
Any object all has intrinsic frequency, is determined by factors such as its material, structure, size, shapes, intrinsic frequency
It is an intrinsic physical features of object itself.When object is instigated by a certain specific frequency, it can cause and vibrate and make to shake
Width reaches maximum, and this frequency is exactly natural frequency of object.
Chinese invention patent application ZL201010170424.4 discloses electromagnetic drive type resonant, inherent frequency demonstrator,
It is constantly changed by the polarity of electromagnet, so as to attract the metal strip below electromagnet not inhale for a moment for a moment
Draw, produce the driving force of a cycle change so that metal strip is constantly shaken up and down, so by controlling low frequency signal to send out
The frequency of raw device, can cause metal strip vibration amplitude constantly to change, when the frequency and metal that low frequency signal sends out emperorship are long
When the frequency of bar is identical, resonance is reached, now the vibration amplitude of metal strip is maximum.The apparatus for demonstrating of this intrinsic frequency,
Observed when metal strip shakes by naked eyes, due to be rely on people feel judge whether to reach peak swing
, positioning intrinsic frequency error is big, and the size of its amplitude can not be determined by visually observing, and works as using different materials and cut
When the strip workpiece in face is tested, due to being macroscopic, the intrinsic frequency between two different workpieces is differed sometimes
It is small, it is difficult to intuitively find out difference therein, therefore, a kind of observation straight tube of invention, and can be with the size for finding out amplitude of straight tube
Device be urgent problem.
The content of the invention
For above-mentioned situation, to overcome the defect of prior art, the present invention provides a kind of thing for demonstrating natural frequency of object
Reason teaching aid and the method for comparing different metal bar intrinsic frequency, effectively solve intrinsic frequency apparatus for demonstrating of the prior art
It is low using precision is visually observed, it is impossible to the problem of the size of the intrinsic frequency between significant difference different workpieces.
The physical teaching aid of present invention demonstration natural frequency of object, including base, bonding jumper, low frequency generator and electromagnetism
Iron, it is characterised in that one end of the bonding jumper is clamped through fixture, the other end of the bonding jumper is vacantly placed under electromagnet
Side, in addition to one end rotate connection and the first lever that can be rotated upwardly and downwardly, the lower end contacting metal bar of first lever, institute
The connection end that rotates for stating the first lever is less than the first lever free end to the distance of bonding jumper, in addition to one to the distance of bonding jumper
End rotates connection and the second lever that can rotate upwardly and downwardly, have between second lever and the first lever when the first lever to
The structure for driving the second lever to move up when upper mobile, the distance of rotation connection end to the first lever of second lever is small
Distance in the second lever free end to the first lever, the second lever top axial is slided provided with being placed in the first lever and the
The driving rack of vertically slidable setting, the driving rack are hinged on contiguous block between two lever free ends, the contiguous block
On be engaged with drive gear, the drive gear has the check configuration rotated when rack is moved up, the drive gear
It is coaxially connected with the first connection gear, the first connection gear and is engaged with first terminal gear, the first terminal gear
On be engaged with terminal rack, in addition to be arranged on the graduated scale plate of band of terminal rack radial direction side, the terminal rack
On be connected with the infrared pen being irradiated on scale plate.
A kind of method for comparing different metal bar intrinsic frequency, it is characterised in that 1）One end of bonding jumper is clamped,
The other end carries out exciting using exciting device to it；
2）The vibration of bonding jumper is unidirectionally amplified, can be unidirectional amplification upwards or unidirectional amplification downwards；
3）Amplitude after amplification is converted into linear motion, and then drives infrared pen to be projected towards scale plate；
4）The maximum scale that infrared pen is finally cast out is the peak swing of bonding jumper, and the frequency of corresponding exciting device is
For the intrinsic frequency of bonding jumper, intrinsic frequency now is recorded；
5）The bonding jumper of different cross section is subjected to above-mentioned steps successively, its intrinsic frequency is compared.
The vibration that is produced by electromagnet to bonding jumper of the present invention, bonding jumper is clamped by fixture, by the first lever with
Second lever amplifies amplitude, continues amplification amplitude by driving rack to also have one group of gear and turns the vibration of bonding jumper
The linear motion of terminal rack is turned to, terminal rack is moved in the presence of multiple amplitude is amplified along straight line, is driven and is swashed
Light pen projects laser spots to show the size of amplitude on scale plate, and laser spots can only be moved unidirectionally, when bonding jumper reaches most
During large amplitude, laser spots are still on the corresponding scale of peak swing, and observation straight tube is obvious, without being gone rapidly to catch again with human eye
Catch, and be conducive to the contrast of the intrinsic frequency of the bonding jumper of unlike material and different cross section, it is practical.
Brief description of the drawings
Fig. 1 is the schematic perspective view of visual angle one of the present invention.
Fig. 2 is the schematic perspective view of visual angle two of the present invention.
Fig. 3 is the schematic perspective view of visual angle three of the present invention.
Fig. 4 is A portions enlarged drawing in this Fig. 3.
The partial schematic diagram that Fig. 5 is when between lifter plate of the present invention and supporting plate being elevating screw.
Fig. 6 is the schematic diagram that train wheel bridge of the present invention and lower plate clamp bonding jumper.
Fig. 7 is the schematic diagram of clamping cylinder of the present invention.
Fig. 8 is the connection figure between arc guide barrel of the present invention and pulley.
Embodiment
The embodiment of the present invention is described in further detail below in conjunction with accompanying drawing 1-8.
Embodiment 1, including base 1, bonding jumper 2, low frequency generator and electromagnet 3, it is characterised in that the metal
One end of bar 2 is clamped through fixture 4, and the other end of the bonding jumper 2 is vacantly placed in the lower section of electromagnet 3, in addition to one end rotates and connected
The first lever 5 rotated upwardly and downwardly connect, the lower end contacting metal bar 2 of first lever 5, the rotation of first lever 5
Connection end to bonding jumper 2 distance be less than the free end of the first lever 5 arrive bonding jumper 2 distance, in addition to one end rotate connect
There is the band when the first lever 5 is moved up between the second lever 6 that can be rotated upwardly and downwardly, the lever 5 of the second lever 6 and first
The structure that dynamic second lever 6 is moved up, the connection end that rotates of second lever 6 is less than second to the distance of the first lever 5
The free end of lever 6 is to the distance of the first lever 5, and the top axial of the second lever 6, which slides to be provided with, is placed in the first lever 5 and second
The driving rack 8 of vertically slidable setting, the sliding tooth are hinged on contiguous block 7 between the free end of lever 6, the contiguous block 7
Drive gear 9 is engaged with bar 8, the drive gear 9 has the check configuration rotated when driving rack 8 to move up, institute
State drive gear 9 and be coaxially connected with the first connection gear 10, first terminal gear 11 is engaged with the first connection gear 10,
Be engaged with terminal rack 12 on the first terminal gear 11, in addition to be arranged on the radial direction side of terminal rack 12 carry scale
Scale plate 44, be connected with the infrared pen 13 being irradiated on scale plate 44 on the terminal rack 12.This infrared pen is straight line lamp,
The purpose is to irradiate straight line, similar to the light irradiated on teacher's pointer, indicate onto the scale of scale plate, with display terminal
The corresponding scale of rack.
Embodiment 2, on the basis of embodiment 1, the base 1 is provided with what can be moved along the length direction of bonding jumper 2
Supporting plate 14, the lower section of supporting plate 14 is connected with the leading screw 16 set along bonding jumper direction, the folder through feed screw nut 15
Tool 4 is fixed in supporting plate 14, and one end of the leading screw 16 dorsad bonding jumper 2 is provided with handwheel 17, the top of supporting plate 14
Provided with the lifter plate 18 that can be lifted, the fixture 4 is placed in the upper end of lifter plate 18.Specifically, front and rear two rotations of leading screw 16
It is fixed on base 1, one end of the dorsad bonding jumper 2 of leading screw 16 stretches out it and rotates fixed position and be cased with handwheel 17, uses
When, leading screw 16 is turned by handwheel 17, through supporting plate 14 fixture 4 can be driven to be moved along the length direction of bonding jumper 2, can adjusted
Section bonding jumper 2 is placed in the position of the lower section of electromagnet 3.The lower end of supporting plate 14 can be slidably arranged on guide rail, and this guide rail is fixed
On base.Fixture 4 is detachably connected on the upper end of lifter plate 18, and fixture 4 can be fastened on through bolt on lifter plate 18, this
Sample, when needing to clamp the bonding jumper 2 of different cross section, can change different fixtures 4 to clamp, lifter plate 18 and supporting plate 14
Between can be connected by scissors type elevating frame, such scissor-type rises and just constitutes scissor-type liter between valency frame and lifter plate 18
Platform is dropped, one elevating screw 19, elevating screw 19 can be set in centre position between certain lifter plate 18 and supporting plate 14
Lower end be rotatably connected in supporting plate 14, the bottom of elevating screw 19 be fixed with hand twist bar 20, the hand twist the upper end of bar 20 liter
Feed screw nut has been screwed on drop leading screw, multiple connecting rods 21, the upper end of supporting plate 14 are connected between feed screw nut and lifter plate 18
Multiple vertical slide bars 22 set around the surrounding of elevating screw 19 are fixed with, the upper end of slide bar 22 passes lifter plate 18, institute
State vertically slidable cooperation between slide bar 22 and lifter plate 18.Fixture 4 can be scroll chuck fixture or can including one
Dismounting is connected to lower plate 401 in supporting plate 14, has train wheel bridge 402 through bolt connection on lower plate 401, when needing to clamp
During the elongated metal bar 2 of rectangular cross-section, bonding jumper 2 is placed between upper lower plate, then using bolt by upper lower plate
Clamping.The body of fixture 4 can also include a clamping cylinder 23, and the clamping cylinder 23 is arranged at intervals multigroup along its length
Bolt group, the bolt group is made up of multiple grip bolts along clamping cylinder circumference uniform distribution, clamping penetrate clamping cylinder and with folder
Hold a screw thread to coordinate, so when needing to clamp polygonal bonding jumper 2, bonding jumper 2 be placed on to the center of clamping cylinder,
Then multiple grip bolts are screwed, allow its each end face for heading on bonding jumper 2 to fasten it, at the two ends of grip bolt point
The clamp nut being pressed on clamping cylinder is not screwed, elastomeric pad can be set between clamp nut and clamping cylinder, to cause folder
Hold bolt and fix fastening.
Embodiment 3, on the basis of embodiment 1, the upper end of base 1 is fixed with starting stave 24, first lever 5
It is rotatably connected on starting stave 24, the free end of first lever 5 is rotatably connected to vertical first pulley 25, the bottom
The first arc guide barrel 26 coordinated with first pulley 25 for facing first pulley 25 is fixed with seat 1, the first pulley 25 is put
In in the first arc guide barrel 26, the track of the shape of first arc guide barrel 26 along first pulley 25 is set, the first arc
First lever 5 is kept into horizontal limited block 27 provided with support first pulley 25 in guide groove 26.The limited block 27 is removable
Unload and be connected in the first arc guide barrel 26, when needing to adjust the position of limited block 27, adjustment can be pulled down.First arc is set
Guide groove 26 can prevent the radial direction of the first lever 5 from rocking, and can only rotate upwardly and downwardly the first lever 5 is spacing, first pulley 25 is in footpath
It is stuck in upwards in the first arc guide barrel 26, first pulley 25 can only be slided along on the arching trajectory of the first arc guide barrel 26
It is dynamic, it is impossible to move radially.First lever 5 is kept to the state of level, the upper surface of the contacting metal bar 2 of level.
Embodiment 4, on the basis of embodiment 1, the upper end of base 1 is fixed with the second riser 28, second lever 6
It is rotatably connected on the second riser 28, the free end of the second lever 6 is rotatably connected to vertical second pulley 29, the base 1
On be fixed with the second arc guide barrel 30 coordinated with second pulley 29 for facing second pulley 29, the second pulley 29 is placed in the
In two arc guide barrels 30, the track of the shape of second arc guide barrel 30 along second pulley 29 is set.Second arc guide barrel
It can be set in 30 and second lever 6 is kept into horizontal limited block 27 provided with support second pulley 29.The limited block 27
It is detachably connected in the second arc guide barrel 30, when needing to adjust the position of limited block 27, adjustment can be pulled down.Set second
Arc guide barrel 30 can prevent the radial direction of the second lever 6 from rocking, and can only rotate upwardly and downwardly the second lever 6 is spacing, second pulley 29
Diametrically it is stuck in the second arc guide barrel 30, second pulley 29 can only be along on the arching trajectory of the first arc guide barrel 26
Slide, it is impossible to move radially.Second lever 6 is kept to the state of level, the upper surface of the contacting metal bar 2 of level.
Embodiment 5, on the basis of embodiment 1, has when the first lever 5 between the lever 5 of the second lever 6 and first
The structure for driving the second lever 6 to move up when moving up is：Slide and be cased with along its length direction on first lever 5
The second sliding block 32 is housed along its length direction slip cap on first sliding block 31, second lever 6, second sliding block 32 is put
It is hinged between the lower section of the first sliding block 31, the sliding block 32 of the first sliding block 31 and second.Described be hinged can be ball-joint.When
The second lever 6 also keeps horizontal during one 5 level of lever.By the second sliding block 32 and the ball-joint of the first sliding block 31, when the first lever 5
When being driven up rotating by bonding jumper 2, the first sliding block 31 is driven to move up, while the first sliding block 31 is moved up, first
Lever 5 is moved axially with respect to the first sliding block 31, and the first sliding block 31 is moved up through ball-joint（It can also be Universal connector
Head）The second sliding block 32 is driven to move up, the second sliding block 32 drives the second slide bar to move up, while the second slide bar is to moving up
Relative second sliding block 32 is moved axially during moving, relative between the first sliding block 31 and the second sliding block 32 during movement
Rotate.So so that moving up for the first lever 5 drives moving up for the second lever 6.
Embodiment 6, on the basis of embodiment 1, the upper end of the second lever 6 is provided with axially extending inverted T-shaped chute 33,
The lower end of contiguous block 7 is provided with the inverted T-shaped part coordinated with inverted T-shaped chute 33, and the inverted T-shaped part is slidably disposed within inverted T-shaped chute 33
Interior, the upper end of contiguous block 7 is hinged driving rack 8, and the base 1 is provided with the 3rd riser 34, and rack 8 is vertically slidable is connected to for driving
On 3rd riser 34.When the second lever 6 is rotated up, contiguous block 7 is driven to move up, contiguous block 7 moves up drive and driven
Moved on the line of carry-over bar 8, driving rack 8 can only be being moved up and down by the 3rd riser 34 is spacing.It is rotated up in the second lever 6
During, relatively rotated between contiguous block 7 and driving rack 8, contiguous block 7 is slided in T-shaped chute 33.
Embodiment 7, on the basis of embodiment 1, the 4th riser 35 and the 5th riser 36 are interval with the base 1,
Rotating shaft 37 is rotatably connected between 4th riser 35 and the 5th riser 36, drive gear 9 is fixed in rotating shaft 37, described turn
Ratchet 38 is cased with axle 37, the ratchet 38 is provided with the ratchet 40 that ratchet 38 is pressed to through tabletting 39, the first connection gear
10 are fixed in rotating shaft 37, and the connection that one end is rotatably connected on the 4th riser 35 is equipped with the first terminal gear 11
Axle.4th riser 35 is placed in the inner side of the second lever 6, and the 5th riser 36 is placed in the outside of the second lever 6.3rd riser 34 and
Four risers 35 can be same plate.
Embodiment 8, on the basis of embodiment 7, the first connection gear 10 is dorsad covered in the rotating shaft 37 in rack direction
Intrinsic diameter is more than the second connection gear 41 of the first connection gear 10, and the second connection gear 41 is engaged with second terminal tooth
Wheel 42, is engaged when the radial translation of terminal rack 12 is to second terminal 42 lower section of gear with second terminal gear 42.Second terminal
Gear 42 can also be rotatably connected on the 5th riser 36 through a connecting shaft.
Embodiment 9, on the basis of embodiment 1, the base 1 is provided with the cunning that can be moved radially along terminal rack 12
Plate 43, the terminal rack 12 is axially movable to be connected on slide plate 43.The lower end of slide plate 43 is fixed with support feet, support feet along
Terminal rack 12 is radially displaceable to be connected on base 1.It can be outputed on base 1 along terminal rack 12 corresponding to support feet
The chute radially extended, support feet is slidably connected in chute.A feed screw nut, leading screw can also be connected in the lower end of slide plate 43
Nut inward turning be screwed be rotatably connected on base 1 apart from adjusting screw, rotary distance adjusting screw is used for adjusting slider 43
Move and slide plate 43 can be positioned in real time.
Embodiment 10, on the basis of embodiment 1, non-magnetic shape support of the electromagnet 3 through being fixed on base 1 hangs
Sky is fixed.Electromagnet 3 is connected on low frequency generator, and electromagnet 3 can also be provided in plexiglass tent, organic glass
Glass cover sets an opening that can make it that bonding jumper 2 passes through towards one end of bonding jumper 2.
Embodiment 11, a kind of method for comparing the intrinsic frequency of different metal bar 2, it is characterised in that 1）By the one of bonding jumper 2
End is clamped, and the other end carries out exciting using exciting device to it；
2）The vibration of bonding jumper 2 is unidirectionally amplified, can be unidirectional amplification upwards or unidirectional amplification downwards；
3）Amplitude after amplification is converted into linear motion, and then drives infrared pen to be projected towards scale plate；
4）The maximum scale that infrared pen is finally cast out is the peak swing of bonding jumper 2, the frequency of corresponding exciting device
As the intrinsic frequency of bonding jumper 2, records intrinsic frequency now；
5）The bonding jumper 2 of different cross section is subjected to above-mentioned steps successively, its intrinsic frequency is compared.
The bonding jumper 2 of above method is magnetic conductive metal bar 2, can be ferrous metal strip.Above exciting device can be with
For electromagnet 3, the connection low frequency generator of electromagnet 3.
It is that the first connection gear 10 is more than drive gear 9 when multiple gears are set.
The present invention when in use, the frequency of the alternating current in low frequency generator control input electromagnet 3, by
It is bar magnet in the electromagnet 3 of energization, low frequency generator output is alternating current, so the polarity of electromagnet 3 is not
It is disconnected to change, so as to attract not attract to the bonding jumper 2 of the lower section of electromagnet 3 for a moment for a moment, produce a cycle change
Driving force so that bonding jumper 2 is constantly shaken up and down, so the frequency by controlling low frequency generator, can cause metal
The Oscillation Amplitude of bar 2 is continually changing, and when the frequency of low frequency generator is identical with the intrinsic frequency of bonding jumper 2, reaches resonance,
Now the Oscillation Amplitude of metal strip is maximum.When bonding jumper 2 vibrates, when bonding jumper 2 is walked upwards, promote the first lever 5 upward
Mobile, now the first pulley 25 of the free end of the first lever 5 is moved up in the first arc guide barrel 26 along circular arc, the first lever
5 move up is amplified on the second lever 6, and the second lever 6 is moved up under the drive of the first lever 5, now the second thick stick
The second pulley 29 of the free end of bar 6 is moved up in the second arc guide barrel 30 along circular arc, the upper mobile amplification of the second lever 6
Onto driving rack 8, driving rack 8 is moved up and down, and driving rack 8 moves up drive drive gear 9 and rotated, sliding tooth
The rotation of bar 8 is amplified on the first connection gear 10 and the second connection gear 41 respectively, and the first connection gear 10 and second is connected
Gear 41 drives first terminal gear 11 and second terminal gear 42 to rotate respectively, when terminal rack 12 is located under the first extreme gear
When, driven, when terminal rack 12 is located under second terminal gear 42, driven by second terminal gear 42 by first terminal gear 11
It is dynamic, two groups of different connection gears and extreme gear are set, can to select gearratio when the peak swing of bonding jumper 2 is small
Larger combination, when the peak swing of bonding jumper 2 is big, selects the less combination of gearratio so that observation facilitates clear, terminal
When gear drives the axial movement of terminal rack 12, terminal rack 12 drives infrared pen 13 namely laser pen to move, infrared pen 13
Laser spots are projected on the scale of scale plate, original state can be first adjusted so that the laser spots of infrared pen 13 are projected
The illuminated line of 0 seat of scale, scale plate and infrared pen 13 is perpendicular, and when infrared pen 13 is moved, its laser spots is also followed
Mobile, when bonding jumper 2 reaches peak swing, the numerical value that laser spots are projected on scale reaches maximum, the low frequency of record now
The frequency of generator, this frequency is the intrinsic frequency of bonding jumper 2, and the extreme gears of two groups of gearratios is different with two groups of correspondence
Scale, scale can be configured according to overall gearratio.The present invention can be for contrast unlike material and different cross section
Bonding jumper 2, is clamped using different fixtures 4, and last peak swing reaches that rear laser spots are navigated at peak swing,
So that record cleaning is obvious, very clear, contrast is clear, can intuitively find out consolidating for unlike material and the bonding jumper 2 in section
There are the size of frequency and the size of amplitude.In the present invention, in addition to bonding jumper 2, the part of electromagnet 3 and low frequency generator part,
Parts protection base 1 on remaining base 1 has non-permeable material to be made, and such as copper and aluminium, bonding jumper 2 are magnetic conductivity material
Material is made.The height of lifter plate 18 can be adjusted in the present invention according to the thickness of bonding jumper 2, to allow bonding jumper 2 just
The downside of the first lever 5 is placed in well to contact with the first lever 5.The present invention is during test, due to there is the structure of ratchet 38, because
This, driving rack 8 can only the rotation of the one direction of drive shaft 37, that is, when driving rack 8 to move up, could drive shaft
37 rotations, because driving rack 8 also has the first lever 5 and the second lever 6 to have deadweight, after it moves up certain angle,
Have and move down trend, now due to the stuck single direction ratchet 38 of 38 ratchet of single direction ratchet 40 so that single direction ratchet 38 can not
Reversion, and due to being linkage between the first lever 5, the second lever 6, driving rack 8 and rotating shaft 37, therefore in the ratchet of ratchet 38
In the presence of 40, the first lever 5, the second lever 6 and driving rack 8 can only be moved up.When test completion needs to reset, dial
Play ratchet 40 so that ratchet 38 can be overturn so that the first bar bar, the second lever 6 and the driving return of rack 8.
The vibration that is produced by electromagnet to bonding jumper of the present invention, bonding jumper is clamped by fixture, by the first lever with
Second lever amplifies amplitude, continues amplification amplitude by driving rack to also have one group of gear and turns the vibration of bonding jumper
The linear motion of terminal rack is turned to, terminal rack is moved in the presence of multiple amplitude is amplified along straight line, is driven and is swashed
Light pen projects laser spots to show the size of amplitude on scale plate, and laser spots can only be moved unidirectionally, when bonding jumper reaches most
During large amplitude, laser spots are still on the corresponding scale of peak swing, and observation straight tube is obvious, without being gone rapidly to catch again with human eye
Catch, and be conducive to the contrast of the intrinsic frequency of the bonding jumper of unlike material and different cross section, it is practical.
Claims (10)
1. the physical teaching aid of natural frequency of object is demonstrated, including base（1）, bonding jumper（2）, low frequency generator and electromagnet
（3）, it is characterised in that the bonding jumper（2）One end through fixture（4）Clamping, the bonding jumper（2）The other end be vacantly placed in
Electromagnet（3）Lower section, in addition to one end rotate the first lever rotated upwardly and downwardly of connection（5）, first lever（5）Under
End in contact bonding jumper（2）, first lever（5）Rotation connection end to bonding jumper（2）Distance be less than the first lever（5）From
By end to bonding jumper（2）Distance, include one end rotate connection the second lever rotated upwardly and downwardly（6）, second thick stick
Bar（6）With the first lever（5）Between have when the first lever（5）The second lever is driven when moving up（6）The knot moved up
Structure, second lever（6）Rotation connection end to the first lever（5）Distance be less than the second lever（6）Free end is to first
Lever（5）Distance, second lever（6）Top axial, which slides to be provided with, is placed in the first lever（5）With the second lever（6）Freely
Contiguous block between end（7）, the contiguous block（7）On be hinged the driving rack of vertically slidable setting（8）, the driving rack
（8）On be engaged with drive gear（9）, the drive gear（9）With when driving rack（8）The unidirectional knot rotated when moving up
Structure, the drive gear（9）It is coaxially connected with the first connection gear（10）, the first connection gear（10）On be engaged with first
Extreme gear（11）, the first terminal gear（11）On be engaged with terminal rack（12）, in addition to it is arranged on terminal rack
（12）The graduated scale plate of band of radial direction side（44）, the terminal rack（12）On be connected with and be irradiated to scale plate（44）On
Infrared pen（13）.
2. the physical teaching aid of demonstration natural frequency of object according to claim 1, it is characterised in that the base（1）On
Provided with can be along bonding jumper（2）The supporting plate of length direction movement（14）, the supporting plate（14）Lower section is through feed screw nut（15）
It is connected with the leading screw set along bonding jumper direction（16）, the fixture（4）It is fixed on supporting plate（14）On, the leading screw（16）
Dorsad bonding jumper（2）One end be provided with handwheel（17）, the supporting plate（14）Top is provided with the lifter plate that can be lifted（18）,
The fixture（4）It is placed in lifter plate（18）Upper end.
3. the physical teaching aid of demonstration natural frequency of object according to claim 1, it is characterised in that the base（1）On
End is fixed with starting stave（24）, first lever（5）It is rotatably connected on starting stave（24）On, first lever（5）
Free end be rotatably connected to vertical first pulley（25）, the base（1）On be fixed with and face first pulley（25）With
First pulley（25）The first arc guide barrel coordinated（26）, the first pulley（25）It is placed in the first arc guide barrel（26）It is interior, institute
State the first arc guide barrel（26）Shape along first pulley（25）Track set, the first arc guide barrel（26）It is interior to be provided with support
First pulley（25）By the first lever（5）Keep horizontal limited block（27）.
4. the physical teaching aid of demonstration natural frequency of object according to claim 1, it is characterised in that the base（1）On
End is fixed with the second riser（28）, second lever（6）It is rotatably connected on the second riser（28）On, the second lever（6）From
Vertical second pulley is rotatably connected to by end（29）, the base（1）On be fixed with and face second pulley（29）With second
Pulley（29）The second arc guide barrel coordinated（30）, the second pulley（29）It is placed in the second arc guide barrel（30）It is interior, described
Two arc guide barrels（30）Shape along second pulley（29）Track set.
5. the physical teaching aid of demonstration natural frequency of object according to claim 1, it is characterised in that second lever
（6）With the first lever（5）Between have when the first lever（5）The second lever is driven when moving up（6）The structure moved up
For：First lever（5）On along its length direction slide be cased with the first sliding block（31）, second lever（6）On along
Its length direction slip cap is equipped with the second sliding block（32）, second sliding block（32）It is placed in the first sliding block（31）Lower section, described
One sliding block（31）With the second sliding block（32）Between be hinged.
6. the physical teaching aid of demonstration natural frequency of object according to claim 1, it is characterised in that second lever
（6）Upper end is provided with axially extending inverted T-shaped chute（33）, the contiguous block（7）Lower end is provided with and inverted T-shaped chute（33）Coordinate
Inverted T-shaped part, the inverted T-shaped part is slidably disposed within inverted T-shaped chute（33）It is interior, contiguous block（7）Upper end is hinged driving rack（8）, it is described
Base（1）It is provided with the 3rd riser（34）, drive rack（8）It is vertically slidable to be connected to the 3rd riser（34）On.
7. the physical teaching aid of demonstration natural frequency of object according to claim 1, it is characterised in that the base（1）On
It is interval with the 4th riser（35）With the 5th riser（36）, the 4th riser（35）With the 5th riser（36）Between rotate connection
There is rotating shaft（37）, drive gear（9）It is fixed in rotating shaft（37）On, the rotating shaft（37）On be cased with ratchet（38）, the ratchet
（38）It is provided with through tabletting（39）Press to ratchet（38）Ratchet（40）, the first connection gear（10）It is fixed in rotating shaft（37）
On, the first terminal gear（11）Inside it is equipped with one end and is rotatably connected on the 4th riser（35）On connecting shaft.
8. the physical teaching aid of demonstration natural frequency of object according to claim 1, it is characterised in that first tooth connection
Wheel（10）The dorsad rotating shaft in rack direction（37）The upper intrinsic diameter of set is more than the first connection gear（10）Second connection gear
（41）, the second connection gear（41）It is engaged with second terminal gear（42）, when terminal rack（12）Radial translation is to second
Extreme gear（42）With second terminal gear during lower section（42）Engagement.
9. the physical teaching aid of demonstration natural frequency of object according to claim 1, it is characterised in that the base（1）On
Provided with can be along terminal rack（12）The slide plate moved radially（43）, the terminal rack（12）It is axially movable to be connected to slide plate
（43）On.
10. a kind of method for comparing different metal bar intrinsic frequency, it is characterised in that 1）By bonding jumper（2）One end pressed from both sides
Hold, the other end carries out exciting using exciting device to it；
2）By bonding jumper（2）Vibration unidirectionally amplified, can be unidirectional amplification upwards or unidirectional amplification downwards；
3）Amplitude after amplification is converted into linear motion, and then drives infrared pen to be projected towards scale plate；
4）The maximum scale that infrared pen is finally cast out as bonding jumper（2）Peak swing, the frequency of corresponding exciting device
Rate is bonding jumper（2）Intrinsic frequency, record intrinsic frequency now；
5）Successively by the bonding jumper of different cross section（2）Above-mentioned steps are carried out, its intrinsic frequency is compared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710249402.9A CN107045822B (en) | 2017-04-17 | 2017-04-17 | It demonstrates the physical teaching aid of natural frequency of object and compares the method for different metal intrinsic frequency |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710249402.9A CN107045822B (en) | 2017-04-17 | 2017-04-17 | It demonstrates the physical teaching aid of natural frequency of object and compares the method for different metal intrinsic frequency |
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| CN109785705A (en) * | 2019-03-02 | 2019-05-21 | 辽东学院 | A kind of Experiment of Electronic Technology real training comprehensive experiment table |
| CN110672430A (en) * | 2019-10-25 | 2020-01-10 | 郑州航空工业管理学院 | Multifunctional low-dimensional photoelectric material detection table |
| CN112029928A (en) * | 2020-09-29 | 2020-12-04 | 刘佳 | Multi-angle leather processing blank pressing device |
| CN112309208A (en) * | 2020-11-17 | 2021-02-02 | 西安理工大学 | Single-degree-of-freedom vibration and resonance demonstration teaching aid |
| CN113096478A (en) * | 2021-04-13 | 2021-07-09 | 新能职业培训学校(天津)有限公司 | Resonance mechanism simulation teaching aid |
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| CN206058655U (en) * | 2016-08-22 | 2017-03-29 | 常泰坤 | A kind of physics teaching apparatus for demonstrating |
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| CN107045822B (en) | 2018-07-17 |
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