CN107045822B - It demonstrates the physical teaching aid of natural frequency of object and compares the method for different metal intrinsic frequency - Google Patents
It demonstrates the physical teaching aid of natural frequency of object and compares the method for different metal intrinsic frequency Download PDFInfo
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- CN107045822B CN107045822B CN201710249402.9A CN201710249402A CN107045822B CN 107045822 B CN107045822 B CN 107045822B CN 201710249402 A CN201710249402 A CN 201710249402A CN 107045822 B CN107045822 B CN 107045822B
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 109
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- 238000000034 method Methods 0.000 title claims abstract description 13
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 8
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 25
- 239000000463 material Substances 0.000 description 9
- 230000003028 elevating effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 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
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- 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 intrinsic frequency, effective solution intrinsic frequency apparatus for demonstrating use in the prior art visually observes that precision is low, the problem of being unable to the size of the intrinsic frequency between significant difference different workpieces.1）One end of metal strip is clamped, the other end carries out exciting using exciting device to it；2）The vibration of metal strip is unidirectionally amplified, can be unidirectional amplification upwards, can also be unidirectional amplification downwards；3）Amplified amplitude is converted into linear motion, and then laser pen is driven to be projected towards scale plate；4）The maximum scale that laser pen is finally cast out is the peak swing of metal strip, and the frequency of corresponding exciting device is the intrinsic frequency of metal strip, records intrinsic frequency at this time；5）The metal strip 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, the physical teaching aid of especially a kind of demonstration natural frequency of object and compare different metal
The method of intrinsic frequency.
Background technology
Any object all has intrinsic frequency, by its material, structure, size, shape etc. because usually determining, intrinsic frequency
It is an intrinsic physical features of object itself.When object is instigated by a certain specific frequency, it can cause to vibrate and make to shake
Width reaches maximum value, 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, is not inhaled for a moment to attract the metal strip below electromagnet for a moment
Draw, generates the driving force of a cycle variation so that metal strip constantly shake up and down, so by controlling low frequency signal hair
The frequency of raw device, can make metal strip vibration amplitude constantly change, when the frequency and metal of low frequency signal hair emperorship are long
When the frequency of item is identical, reach resonance, the vibration amplitude of metal strip is maximum at this time.The apparatus for demonstrating of this intrinsic frequency,
By visually being observed when metal strip shakes, due to being to rely on the feeling of people to determine whether reaching peak swing
, positioning intrinsic frequency error is big, visually observes the size that can not determine its amplitude, and works as and use different materials and cut
When the strip workpiece in face is tested, due to being macroscopic, the intrinsic frequency between two different workpieces differs sometimes
It is small, it is difficult to intuitively find out difference therein, therefore, a kind of observation straight tube is invented, and can be with the size for finding out amplitude of straight tube
Device be urgent problem.
Invention content
For the above situation, to overcome the defect of the prior art, the present invention to provide a kind of object of demonstration natural frequency of object
Reason teaching aid and compare the method for different metal intrinsic frequency, effective solution intrinsic frequency apparatus for demonstrating in the prior art
Precision is low using visually observing, the problem of being unable to the size of the intrinsic frequency between significant difference different workpieces.
The present invention demonstrates the physical teaching aid of natural frequency of object, including pedestal, metal strip, low frequency generator and electromagnetism
Iron, which is characterized in that one end of the metal strip is clamped through fixture, and the other end of the metal strip is vacantly placed under electromagnet
The first lever that side further includes one end rotation connection and can be rotated upwardly and downwardly, the lower end contacting metal item of first lever, institute
The distance for stating rotation connection end to the metal strip of the first lever is less than the first lever free end to the distance of metal strip, further includes one
End rotation 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 distance of the structure for driving the second lever to move up when upper mobile, 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 sliding, which is equipped with, is placed in the first lever and the
Link block between two lever free ends hingedly slides vertically the drive rack of setting, the drive rack on the link block
On be engaged with driving gear, the driving gear has the check configuration rotated when rack moves up, the driving gear
It is coaxially connected with the first connection gear, first terminal gear, the first terminal gear are engaged in first connection gear
On be engaged with terminal rack, further include the graduated scale plate of band being arranged in terminal rack radial direction side, the terminal rack
On be connected with the infrared pen being irradiated on scale plate.
A method of relatively different metal intrinsic frequency, which is characterized in that 1）One end of metal strip is clamped,
The other end carries out exciting using exciting device to it；
2）The vibration of metal strip is unidirectionally amplified, can be unidirectional amplification upwards, can also be unidirectional amplification downwards；
3）Amplified amplitude is converted into linear motion, and then infrared pen is driven to be projected towards scale plate；
4）The maximum scale that infrared pen is finally cast out is the peak swing of metal strip, the frequency of corresponding exciting device
Rate is the intrinsic frequency of metal strip, records intrinsic frequency at this time；
5）The metal strip of different cross section is subjected to above-mentioned steps successively, its intrinsic frequency is compared.
Metal strip is clamped by fixture in the vibration that the present invention generates metal strip by electromagnet, by the first lever and
Second lever amplifies amplitude, also has one group of gear by drive rack to continue to amplify amplitude and turn the vibration of metal strip
The linear motion of terminal rack is turned to, terminal rack is moved under the action of amplifying multiple amplitude along straight line, is driven and is swashed
Light pen projects laser point to show that the size of amplitude, laser point can only be moved unidirectionally on scale plate, when metal strip reaches most
When large amplitude, laser point is still on the corresponding scale of peak swing, and observation straight tube is apparent, without going rapidly to catch with human eye again
It catches, and is conducive to the comparison of the intrinsic frequency of the metal strip of unlike material and different cross section, it is highly practical.
Description of the drawings
Fig. 1 is one stereoscopic schematic diagram of visual angle of the present invention.
Fig. 2 is two stereoscopic schematic diagram of visual angle of the present invention.
Fig. 3 is three stereoscopic schematic diagram of visual angle of the present invention.
Fig. 4 is the portions A enlarged drawing in this Fig. 3.
The partial schematic diagram that Fig. 5 is between lifter plate of the present invention and support plate when being elevating screw.
Fig. 6 is the schematic diagram that metal strip is clamped in upper clamp plate of the present invention and lower clamp plate.
Fig. 7 is the schematic diagram of clamping cylinder of the present invention.
Connection figures of the Fig. 8 between arc guide barrel of the present invention and pulley.
Specific implementation mode
The specific implementation mode of the present invention is described in further detail below in conjunction with attached drawing 1-8.
Embodiment 1, including pedestal 1, metal strip 2, low frequency generator and electromagnet 3, which is characterized in that the metal
One end of item 2 is clamped through fixture 4, and the other end of the metal strip 2 is vacantly placed in 3 lower section of electromagnet, further includes that one end rotation connects
The first lever 5 rotated upwardly and downwardly connect, the lower end contacting metal item 2 of first lever 5, the rotation of first lever 5
The distance of connecting pin to metal strip 2 is less than 5 free end of the first lever to the distance of metal strip 2, further includes what one end was rotatablely connected
The second lever 6 that can be rotated upwardly and downwardly has the band when the first lever 5 moves up between second lever, 6 and first lever 5
The distance of the structure that dynamic second lever 6 moves up, rotation connection end to the first lever 5 of second lever 6 is less than second
For 6 free end of lever to the distance of the first lever 5,6 top axial of the second lever sliding, which is equipped with, is placed in the first lever 5 and second
Link block 7 between 6 free end of lever hingedly slides vertically the drive rack 8 of setting, the sliding tooth on the link block 7
Driving gear 9 is engaged on item 8, the driving gear 9 has the check configuration rotated when drive rack 8 moves up, institute
It states driving gear 9 and is coaxially connected with the first connection gear 10, first terminal gear 11 is engaged in first connection gear 10,
It is engaged with terminal rack 12 on the first terminal gear 11, further includes being arranged to carry scale in the radial side of terminal rack 12
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 pedestal 1 is equipped with and can be moved along 2 length direction of metal strip
Support plate 14,14 lower section of the support plate are connected with the leading screw 16 being arranged along metal strip length direction, institute through feed screw nut 15
It states fixture 4 to be fixed in support plate 14, the leading screw 16 is equipped with handwheel 17, the support plate 14 backwards to one end of metal strip 2
Top is equipped with the lifter plate 18 that can be lifted, and the fixture 4 is placed in 18 upper end of lifter plate.Specifically, front and back two of leading screw 16
Rotation is fixed on pedestal 1, and leading screw 16 stretches out its fixed position of rotation backwards to one end of metal strip 2 and is cased with handwheel 17,
In use, turning leading screw 16 by handwheel 17, fixture 4 can be driven to be moved along 2 length direction of metal strip through support plate 14, it can
To adjust the position that metal strip 2 is placed in 3 lower section of electromagnet.14 lower end of support plate can be slidably arranged on guide rail, this guide rail is
It is fixed on the base.Fixture 4 is detachably connected on 18 upper end of lifter plate, and fixture 4 can be fastened on lifter plate 18 through bolt
On, in this way, when needing that the metal strip 2 of different cross section is clamped, different fixtures 4 can be replaced to be clamped, lifter plate 18 and branch
It can be connected by scissors type elevating frame between fagging 14, such scissor-type rises just to constitute between valence frame and lifter plate 18 and cut
Between certain lifter plate 18 and support plate 14 elevating screw 19, lifting can be arranged in centre position in fork elevating platform
The lower end of leading screw 19 is rotatably connected in support plate 14, and 19 lower part of elevating screw is fixed with hand and twists bar 20, and the hand is twisted on bar 20
Feed screw nut has been screwed on the elevating screw at end, and multiple connecting rods 21, support plate are connected between feed screw nut and lifter plate 18
14 upper ends are fixed with multiple vertical slide bars 22 around the setting of 19 surrounding of elevating screw, and 22 upper end of the slide bar is pierced by lifter plate
18, cooperation is slid vertically between the slide bar 22 and lifter plate 18.Fixture 4 can be scroll chuck fixture, can also be including
One lower clamp plate 401 being detachably connected in support plate 14, through being bolted upper clamp plate 402 on lower clamp plate 401, when need
When clamping the elongated metal item 2 of rectangular cross-section, between metal strip 2 is placed on upper lower clamp plate, then use bolt will be upper
Lower clamp plate clamps.4 body of fixture can also be including a clamping cylinder 23, and the clamping cylinder 23 is spaced sets along its length
Multigroup bolt group is set, the bolt group is made of multiple grip bolts along clamping cylinder circumference uniform distribution, and clamping penetrates clamping cylinder
And metal strip 2 is placed in clamping cylinder in this way when needing that the metal strip 2 of polygon is clamped with clamping cylinder screw-thread fit
Then heart position screws multiple grip bolts, allowing it to head on each end face of metal strip 2 makes it fasten, in grip bolt
Both ends screw the fastening nut being pressed on clamping cylinder respectively, elastomeric pad can be set between fastening nut and clamping cylinder,
So that grip bolt fixes fastening.
Embodiment 3, on the basis of embodiment 1,1 upper end of the pedestal 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
It is fixed with the first arc guide barrel 26 coordinated with first pulley 25 for facing first pulley 25 on seat 1, the first pulley 25 is set
In in the first arc guide barrel 26, the shape of first arc guide barrel 26 is arranged along the track of first pulley 25, the first arc
Support first pulley 25 is equipped in guide groove 26 keeps horizontal limited block 27 by the first lever 5.The limited block 27 is removable
It unloads and is connected in the first arc guide barrel 26, when needing to adjust the position of limited block 27, adjustment can be removed.First arc is set
Guide groove 26 can prevent the first lever 5 from radially shaking, and the limit of the first lever 5 can only rotated upwardly and downwardly, first pulley 25 is in diameter
It is stuck in upwards in the first arc guide barrel 26, first pulley 25 can only be along sliding on the arching trajectory of the first arc guide barrel 26
It is dynamic, it cannot move radially.First lever 5 is kept into horizontal state, the upper surface of horizontal contacting metal item 2.
Embodiment 4, on the basis of embodiment 1,1 upper end of the pedestal 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 pedestal 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
In two arc guide barrels 30, the shape of second arc guide barrel 30 is arranged along the track of second pulley 29.Second arc guide barrel
It can be arranged in 30 and second lever 6 is kept into horizontal limited block 27 equipped 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 removed.Setting second
Arc guide barrel 30 can prevent the second lever 6 from radially shaking, and the limit of the second lever 6 can only rotated upwardly and downwardly, second pulley 29
It is stuck in radially in the second arc guide barrel 30, second pulley 29 can only be on the arching trajectory along the first arc guide barrel 26
Sliding, cannot move radially.Second lever 6 is kept into horizontal state, the upper surface of horizontal contacting metal item 2.
Embodiment 5 has between second lever, 6 and first lever 5 when the first lever 5 on the basis of embodiment 1
The structure that the second lever 6 moves up is driven to be when moving up：It is cased with along the sliding of its length direction on first lever 5
First sliding block 31, is equipped with the second sliding block 32 on second lever 6 along its length direction sliding sleeve, and second sliding block 32 is set
It is hinged between first sliding block, 31 and second sliding block 32 in 31 lower section of the first sliding block.Described can be hingedly ball-joint.When
Second lever 6 also keeps horizontal when one lever 5 is horizontal.By 31 ball-joint of the second sliding block 32 and the first sliding block, when the first lever 5
When being driven up rotation by metal strip 2, the first sliding block 31 is driven to move up, while the first sliding block 31 moves 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
It moves and is moved axially in the process with respect to the second sliding block 32, it is opposite between the first sliding block 31 and the second sliding block 32 in the process of moving
Rotation.In this way so that moving up for the first lever 5 drives moving up for the second lever 6.
Embodiment 6, on the basis of embodiment 1,6 upper end of the second lever is equipped with axially extending inverted T-shaped sliding slot 33,
7 lower end of the link block is equipped with the inverted T-shaped part coordinated with inverted T-shaped sliding slot 33, and the inverted T-shaped part is slidably disposed within inverted T-shaped sliding slot 33
Interior, 7 upper end of link block is hinged drive rack 8, and the pedestal 1 is equipped with third riser 34, and drive rack 8, which slides vertically, to be connected to
On third riser 34.When the second lever 6 is rotated up, link block 7 is driven to move up, link block 7 moves up drive and drives
It is moved on 8 line of carry-over bar, drive rack 8 can only moved up and down by the limit of third riser 34.It is rotated up in the second lever 6
In the process, it is relatively rotated between link block 7 and drive rack 8, the sliding in T shapes sliding slot 33 of link block 7.
Embodiment 7 is equipped at intervals with the 4th riser 35 and the 5th riser 36 on the basis of embodiment 1 on the pedestal 1,
Shaft 37 is rotatably connected between 4th riser 35 and the 5th riser 36, driving gear 9 is fixed in shaft 37, described turn
Ratchet 38 is cased on axis 37, the ratchet 38 is equipped with the pawl 40 that ratchet 38 is pressed to through tabletting 39, first connection gear
10 are fixed in shaft 37, and the connection that one end is rotatably connected on the 4th riser 35 is equipped in the first terminal gear 11
Axis.4th riser 35 is placed in the inside of the second lever 6, and the 5th riser 36 is placed in the outside of the second lever 6.Third riser 34 and
Four risers 35 can be the same plate.
Embodiment 8, on the basis of embodiment 7, first connection gear 10 covers in the shaft 37 in rack direction
Intrinsic diameter is more than the second connection gear 41 of the first connection gear 10, and second connection gear 41 is engaged with second terminal tooth
Wheel 42, is engaged when 12 radial translation of terminal rack is to second terminal 42 lower section of gear with second terminal gear 42.Second terminal
Gear 42 can also be rotatably connected on through a connecting shaft on the 5th riser 36.
Embodiment 9, on the basis of embodiment 1, the pedestal 1 is equipped 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 43.43 lower end of slide plate is fixed with support leg, support leg along
Terminal rack 12 is radially displaceable to be connected on pedestal 1.It can be outputed along terminal rack 12 corresponding to support leg on pedestal 1
The sliding slot radially extended, support leg are slidably connected in sliding slot.A feed screw nut, leading screw can also be connected in 43 lower end of slide plate
Nut inward turning be screwed be rotatably connected on pedestal 1 apart from adjusting screw, rotary distance adjusting screw is used for adjusting slider 43
It moves and slide plate 43 can be positioned in real time.
Embodiment 10, on the basis of embodiment 1, non-magnetic shape holder of the electromagnet 3 through being fixed on pedestal 1 is outstanding
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 towards metal strip 2 one end be arranged one can make metal strip 2 by opening.
Embodiment 11, a method of relatively 2 intrinsic frequency of different metal item, which is characterized in that 1）By the one of metal strip 2
End is clamped, and the other end carries out exciting using exciting device to it；
2）The vibration of metal strip 2 is unidirectionally amplified, can be unidirectional amplification upwards, can also be unidirectionally to decentralization
Greatly；
3）Amplified amplitude is converted into linear motion, and then infrared pen is driven to be projected towards scale plate；
4）The maximum scale that infrared pen is finally cast out is the peak swing of metal strip 2, corresponding exciting device
Frequency is the intrinsic frequency of metal strip 2, records intrinsic frequency at this time；
5）The metal strip of different cross section 2 is subjected to above-mentioned steps successively, its intrinsic frequency is compared.
The metal strip 2 of above method is magnetic conductive metal item 2, can be ferrous metal strip.The above exciting device can be with
For electromagnet 3, electromagnet 3 connects low frequency generator.
It is that the first connection gear 10 is more than driving gear 9 when multiple gears are set.
When in use, low frequency generator control inputs the frequency of the alternating current in electromagnet 3 to the present invention, 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, do not attract for a moment to which the metal strip 2 to 3 lower section of electromagnet attracts for a moment, generates a cycle variation
Driving force so that the constantly shake up and down of metal strip 2, so the frequency by controlling low frequency generator, can make metal
2 Oscillation Amplitude of item constantly changes, and when the frequency of low frequency generator is identical as the intrinsic frequency of metal strip 2, reaches resonance,
The Oscillation Amplitude of metal strip is maximum at this time.When metal strip 2 vibrates, when metal strip 2 is walked upwards, the first lever 5 is pushed upwards
Mobile, the first pulley 25 of 5 free end of the first lever moves up in the first arc guide barrel 26 along circular arc at this time, the first lever
5 move up is amplified on the second lever 6, and the second lever 6 moves up under the drive of the first lever 5, at this time the second thick stick
The second pulley 29 of the free end of bar 6 moves up in the second arc guide barrel 30 along circular arc, the upper mobile amplification of the second lever 6
Onto drive rack 8, drive rack 8 moves up and down, and drive rack 8 moves up drive driving gear 9 and rotates, sliding tooth
The rotation of item 8 is amplified to respectively in the first connection gear 10 and the second connection gear 41, the connection of the first connection gear 10 and second
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, it is driven by first terminal gear 11, when terminal rack 12 is located under second terminal gear 42, is driven by second terminal gear 42
It is dynamic, two groups of different connection gears and extreme gear are set, can to select transmission ratio when the peak swing of metal strip 2 is small
Larger combination, when the peak swing of metal strip 2 is big, selection is driven smaller combination so that observation facilitates clear, terminal
When gear drives terminal rack 12 to move axially, terminal rack 12 drives the namely laser pen of infrared pen 13 to move, infrared pen 13
Laser point is projected on the scale of scale plate, original state can be first adjusted so that the laser point of infrared pen 13 projects
The illuminated line of 0 seat of scale, scale plate and infrared pen 13 is perpendicular, and when infrared pen 13 moves, laser point also follows
Mobile, when metal strip 2 reaches peak swing, laser point projects the numerical value on scale and reaches maximum, records low frequency at this time
The frequency of generator, this frequency are the intrinsic frequency of metal strip 2, the extreme gear of two groups of transmission ratios and it is corresponding two groups it is different
Scale, scale can be configured according to whole transmission ratio.The present invention can be used for comparing unlike material and different cross section
Metal strip 2 is clamped using different fixtures 4, and last peak swing reaches rear laser point and navigates at peak swing,
So that record cleaning is apparent, very clear, comparison is clear, can intuitively find out consolidating for unlike material and the metal strip 2 in section
There are the size of frequency and the size of amplitude.In the present invention, other than metal strip 2,3 part of electromagnet and low frequency generator part,
Parts protection pedestal 1 on remaining pedestal 1 has non-permeable material to be made, and such as copper and aluminium, metal strip 2 is magnetic conductivity material
Material is made.The height that lifter plate 18 can be adjusted in the present invention according to the thickness of metal strip 2, so that metal strip 2 can be just
5 downside of the first lever is placed in well to contact with the first lever 5.The present invention is during test, due to there is 38 structure of ratchet, because
This, drive rack 8 can only the rotation of 37 one direction of drive shaft could drive shaft that is, when drive rack 8 moves up
37 rotations, since drive rack 8 also has the first lever 5 and the second lever 6 to have dead weight, after it moves up certain angle,
Have and move down trend, at this time due to 38 pawl of single direction ratchet, 40 stuck single direction ratchet 38 so that single direction ratchet 38 cannot
Reversion, and due to being linkage between the first lever 5, the second lever 6, drive rack 8 and shaft 37, in 38 pawl of ratchet
Under the action of 40, the first lever 5, the second lever 6 and drive rack 8 can only move up.When test is completed to need to reset, dial
Play pawl 40 so that ratchet 38 can be overturn so that 8 return of the first bar bar, the second lever 6 and drive rack.
Metal strip is clamped by fixture in the vibration that the present invention generates metal strip by electromagnet, by the first lever and
Second lever amplifies amplitude, also has one group of gear by drive rack to continue to amplify amplitude and turn the vibration of metal strip
The linear motion of terminal rack is turned to, terminal rack is moved under the action of amplifying multiple amplitude along straight line, is driven and is swashed
Light pen projects laser point to show that the size of amplitude, laser point can only be moved unidirectionally on scale plate, when metal strip reaches most
When large amplitude, laser point is still on the corresponding scale of peak swing, and observation straight tube is apparent, without going rapidly to catch with human eye again
It catches, and is conducive to the comparison of the intrinsic frequency of the metal strip of unlike material and different cross section, it is highly practical.
Claims (11)
1. demonstrating the physical teaching aid of natural frequency of object, including pedestal（1）, metal strip（2）, low frequency generator and electromagnet
（3）, which is characterized in that the metal strip（2）One end through fixture（4）Clamping, the metal strip（2）The other end be vacantly placed in
Electromagnet（3）Lower section further includes the first lever of one end rotation connection rotated upwardly and downwardly（5）, first lever（5）Under
End in contact metal strip（2）, first lever（5）Rotation connection end to metal strip（2）Distance be less than the first lever（5）From
By end to metal strip（2）Distance, further include one end rotation 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 sliding, which is equipped with, is placed in the first lever（5）With the second lever（6）Freely
Link block between end（7）, the link block（7）On hingedly slide vertically the drive rack of setting（8）, the drive rack
（8）On be engaged with driving gear（9）, the driving gear（9）With working as drive rack（8）The unidirectional knot rotated when moving up
Structure, the driving gear（9）It is coaxially connected with the first connection gear（10）, first connection gear（10）On be engaged with first
Extreme gear（11）, the first terminal gear（11）On be engaged with terminal rack（12）, further include being arranged in terminal rack
（12）The graduated scale plate of band of radial 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, which is characterized in that the pedestal（1）On
Equipped with can be along metal strip（2）The support plate of length direction movement（14）, the support plate（14）Lower section is through feed screw nut（15）
It is connected with the leading screw being arranged along metal strip length direction（16）, the fixture（4）It is fixed on support plate（14）On, the leading screw
（16）Backwards to metal strip（2）One end be equipped with handwheel（17）, the support plate（14）Top is equipped 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, which is characterized in that the pedestal（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 pedestal（1）On be fixed with and face first pulley（25）With
First pulley（25）First arc guide barrel of cooperation（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 setting, the first arc guide barrel（26）It is interior to be equipped 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, which is characterized in that the pedestal（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 pedestal（1）On be fixed with and face second pulley（29）With second
Pulley（29）Second arc guide barrel of cooperation（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 setting.
5. the physical teaching aid of demonstration natural frequency of object according to claim 1, which is characterized 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 sliding be cased with the first sliding block（31）, second lever（6）On along
Its length direction sliding sleeve 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 it is hinged.
6. the physical teaching aid of demonstration natural frequency of object according to claim 1, which is characterized in that second lever
（6）Upper end is equipped with axially extending inverted T-shaped sliding slot（33）, the link block（7）Lower end is equipped with and inverted T-shaped sliding slot（33）Cooperation
Inverted T-shaped part, the inverted T-shaped part are slidably disposed within inverted T-shaped sliding slot（33）It is interior, link block（7）Upper end is hinged drive rack（8）, described
Pedestal（1）It is equipped with third riser（34）, drive rack（8）It slides vertically and is connected to third riser（34）On.
7. the physical teaching aid of demonstration natural frequency of object according to claim 1, which is characterized in that the pedestal（1）On
It is equipped at intervals with the 4th riser（35）With the 5th riser（36）, the 4th riser（35）With the 5th riser（36）Between be rotatablely connected
There is shaft（37）, drive gear（9）It is fixed in shaft（37）On, the shaft（37）On be cased with ratchet（38）, the ratchet
（38）It is equipped with through tabletting（39）Press to ratchet（38）Pawl（40）, first connection gear（10）It is fixed in shaft（37）
On, the first terminal gear（11）It is inside 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, which is characterized in that first tooth connection
Wheel（10）Shaft backwards to rack direction（37）The upper intrinsic diameter of set is more than the first connection gear（10）The second connection gear
（41）, second connection gear（41）It is engaged with second terminal gear（42）, when terminal rack（12）Radial translation is to second
Extreme gear（42）When lower section with second terminal gear（42）Engagement.
9. the physical teaching aid of demonstration natural frequency of object according to claim 1, which is characterized in that the pedestal（1）On
Equipped 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 of relatively different metal intrinsic frequency, which is characterized in that 1）By metal strip（2）One end pressed from both sides
It holds, the other end carries out exciting using exciting device to it；
2）By metal strip（2）Vibration carry out unidirectional amplification upwards；
3）Amplified amplitude is converted into linear motion, and then infrared pen is driven to be projected towards scale plate；
4）The maximum scale that infrared pen is finally cast out is metal strip（2）Peak swing, the frequency of corresponding exciting device
Rate is metal strip（2）Intrinsic frequency, record intrinsic frequency at this time；
5）Successively by the metal strip of different cross section（2）Above-mentioned steps are carried out, its intrinsic frequency is compared.
11. a kind of method of relatively different metal intrinsic frequency, which is characterized in that 1）By metal strip（2）One end pressed from both sides
It holds, the other end carries out exciting using exciting device to it；
2）By metal strip（2）Vibration carry out unidirectional amplification downwards；
3）Amplified amplitude is converted into linear motion, and then infrared pen is driven to be projected towards scale plate；
4）The maximum scale that infrared pen is finally cast out is metal strip（2）Peak swing, the frequency of corresponding exciting device
Rate is metal strip（2）Intrinsic frequency, record intrinsic frequency at this time；
5）Successively by the metal strip 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 |
|---|---|---|---|
| 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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| CN107045822B true CN107045822B (en) | 2018-07-17 |
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| CN111862718B (en) * | 2019-03-02 | 2021-11-23 | 辽东学院 | Electronic technology experiment table |
| CN110672430B (en) * | 2019-10-25 | 2022-02-01 | 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 |
| CN112309208B (en) * | 2020-11-17 | 2023-01-24 | 西安理工大学 | Single-degree-of-freedom vibration and resonance demonstration teaching aid |
| CN113096478B (en) * | 2021-04-13 | 2022-06-14 | 新能职业培训学校(天津)有限公司 | Resonance mechanism simulation teaching aid |
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| CN100392685C (en) * | 2001-06-11 | 2008-06-04 | 陈楚南 | Lissajous figure demonstrating and automatically tracing instrument |
| CN101853595A (en) * | 2010-05-11 | 2010-10-06 | 上海市莘格高级中学 | Electromagnetic drive type resonant and inherent frequency demonstrator |
| CN106327962A (en) * | 2015-06-24 | 2017-01-11 | 丹阳晨厷生物科技有限公司 | Novel mechanical vibration image drawing device |
| CN206058655U (en) * | 2016-08-22 | 2017-03-29 | 常泰坤 | A kind of physics teaching apparatus for demonstrating |
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