CN107740843A - A kind of cam bawl negative stiffness structure low frequency vibration isolation device - Google Patents
A kind of cam bawl negative stiffness structure low frequency vibration isolation device Download PDFInfo
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- CN107740843A CN107740843A CN201711148637.5A CN201711148637A CN107740843A CN 107740843 A CN107740843 A CN 107740843A CN 201711148637 A CN201711148637 A CN 201711148637A CN 107740843 A CN107740843 A CN 107740843A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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Abstract
The present invention relates to a kind of cam bawl negative stiffness structure low frequency vibration isolation device.The low frequency vibration isolation device applies positive and negative Stiffness principle, and using positive stiffness elements and negative stiffness element in parallel, protection is provided with reference to the damping unit suppression system resonance of installation and for too drastic situation；Positive stiffness and negative stiffness adjusting means realizes effective and accurate regulation of positive stiffness and negative stiffness scope, to meet different bearer quality and vibration isolation requirement, efficiently solves the problems such as existing low frequency vibration isolation device installation is inconvenient, complicated, adaptability for working condition is poor.
Description
Technical field
The present invention relates to vibration damping and vibration isolation technical field, and in particular to a kind of cam bawl negative stiffness structure low frequency vibration isolation device.
Background technology
At present, urban track traffic has obtained fast development as one of most effective mode for alleviating urban traffic pressure.
However, its ambient vibration but getting worse for inducing：To impact caused by track gravitational load during train operation, track will be caused
Structural vibration, vibrate along sleeper, railway roadbed, ground etc. and pass to building, instrument and equipment etc., serious ambient vibration will be caused.This
In a little ambient vibrations, low-frequency vibration is the difficult point that ambient vibration is administered.
On the other hand, as dynamic power machine maximizes, light-weighted development, the flexibility of parts continues to increase, soft elastic
Low frequency Vibration getting worse caused by body.And conventional linear rigidity vibration isolation technique only exists(ω and ωnRespectively
For driving frequency and the intrinsic frequency of system) just there is vibration isolating effect；I.e. system parts flexibility increases, and results in the need for anti-low frequency and shakes
It is dynamic, and the intrinsic frequency under the conditions of big machinery high-mechanic often keeps constant, so occurs as soon as the high initiation of system frequency
Anti- low frequency, isolation low-frequency vibration effect difference the problem of, when serious even occur it is quiet deformation excessive and unstability.Therefore, traditional steel
The problem of quiet deformation is excessive occurs when isolating track low-frequency vibration for spring vibration-isolator, and stability and low frequency can not be taken into account by facing
Significant challenge of both vibration isolation capability.
The intrinsic frequency of system must be just reduced in order to improve low frequency vibration isolation ability, this will cause the drop of system stiffness again
It is low, the bearing capacity of system will necessarily be caused to decline.Therefore conventional linear vibration isolator is when isolating low frequency, superlow frequency vibrating, face
Face Low rigidity and contradiction of both big quiet deformation.In order to reduce harm of the low-frequency vibration in engineering, people have studied respectively
Kind oscillation damping method, and corresponding various vibration control apparatus are generated, pertinent literature is as follows：
《Vibration and impact》" the non-linear passive vibration isolation system of novel ultralow frequency is set the 1st phase article of volume 30 in 2011
Meter ", according to the rigidity expression formula of positive and negative Stiffness vibration isolation and equilibrium position zero stiffness condition, devises non-linear rigidity
Ultralow frequency passive vibration isolation system.However, the articulated linkage of the positive and negative Stiffness mechanism of the program can only isolate side straight down
To excitation, have and negative stiffness structure design and realize single, inflexible defect.
The A of Publication No. CN 101871505 Chinese patent literature discloses a kind of three translations of positive and negative Stiffness and shaken
Dynamic and impact isolation platform, has large carrying capacity, stability height, small volume, intrinsic frequency is low, damping is controllable, making and ties up
Protect the features such as cost is low.But its adaptability, flexibility are poor.
The U of Publication No. CN 202520846 Chinese patent literature disclose it is a kind of using four inclined linear springs with
And a vertical linearity spring provides the low frequency vibration isolation device of restoring force, by the rigidity for rationally designing uprighting spring and inclined springs
Coefficient and geometric parameter so that rigidity of the system at equipoise is zero, reaches the purpose of the small rigidity of system dynamic.So
And superlow frequency vibration isolating requires complicated at present, system composition is complicated and state is changeable, and such a structure is single to be expanded according to principle
Low frequency vibration isolation system, it appears structure is excessively simple, and its adaptability, flexibility and scalability are all weaker.
The U of Publication No. CN 202520848 Chinese patent literature discloses a kind of in parallel based on positive Negative stiffness spring
Ultralow frequency vibration isolator, it is made up of lead, upper shield, sliding block, Negative stiffness spring, lower cover, guide holder, ball and main spring, should be every
The device that shakes can realize high Static stiffness, the characteristic of low dynamic rate, realize zero hertz of superlow frequency vibration isolating, and anti-vibration performance is adjustable；Adopt
Rolling friction is realized with ball, reduces frictional resistance；It can be used as a part to be equipped with and use, suitable for bearing vibrational excitation
The environment of environment, especially low-frequency vibration excitation, such as seat, suspension, precision instrument vibration isolation, vibration damping antidetonation etc..But should
The negative stiffness characteristic frequency ranges of vibration isolator depend at upper shield the depth of the mounting hole of the Negative stiffness spring opened up, it is impossible to freely
The regulation of negative stiffness is carried out, has very big restricted, the low-frequency vibration of specific frequency or frequency band can only be isolated.
The U of Publication No. CN 203641365 Chinese patent literature discloses a kind of quasi-zero stiffness vibration isolators, utilizes four
Horizontal spring and a uprighting spring provide restoring force, and connect horizontally moving device using roller-cam gear moves with vertical
Dynamic device, forms a nonlinear geometry mechanism；It is horizontal by the stiffness coefficient and regulation that design uprighting spring and horizontal spring
The decrement of spring, it is zero to make rigidity of the system at equipoise, so as to realize low frequency or superlow frequency vibration isolating.
The B of Publication No. CN 102678804 Chinese patent literature discloses a kind of slides spring beam and just by negative stiffness
The non-linear ultralow frequency vibration isolator of rigid spring composition, total system of the present invention have the approximate quasi- zero stiffness characteristic of dynamic, can be with
To realizing the isolating technique of ULF and having anti-impact effect concurrently.However, this invention vibration isolator in Practical Project for cunning
The material property and installation accuracy of dynamic elasticity beam have very strict requirement, are unfavorable for engineering popularization.
The content of the invention
It is an object of the invention to install inconvenient, complicated, adaptability for working condition is poor etc. for existing low frequency vibration isolation device
Problem, propose a kind of cam bawl negative stiffness structure low frequency vibration isolation device.The low frequency vibration isolation device applies positive and negative Stiffness principle, makes
With positive stiffness elements and negative stiffness element in parallel, provided with reference to the damping unit suppression system resonance of installation and for too drastic situation
Protection；Positive stiffness and negative stiffness adjusting means realizes effective and accurate regulation of positive stiffness and negative stiffness scope, to meet different bearer quality
With vibration isolation requirement.
To achieve the above object, the invention provides a kind of cam bawl negative stiffness structure low frequency vibration isolation device, the low frequency
Vibration isolator include bogey, Negative stiffness spring connecting cylinder roller, plummer connection cam, the positive rigid spring of vertical direction,
Positive rigid spring location adjusting device, horizontal direction Negative stiffness spring structure, Negative stiffness spring positioner, Negative stiffness spring bottom
Board fixer, horizontal direction Negative stiffness spring compression quantity regulating device, and bottom plate fixed support device；Wherein,
Bogey center lower end is connected cam connection with plummer, is Negative stiffness spring in plummer connection cam both sides
Connecting cylinder roller, wherein plummer are connected and connected between cam and Negative stiffness spring connecting cylinder roller for higher pair, are being carried
The lower section connection installation positive rigid spring of vertical direction and positive rigid spring location adjusting device of platform connection cam；Negative stiffness spring
Connecting cylinder roller is connected with horizontal direction Negative stiffness spring structure, and horizontal direction Negative stiffness spring structure is determined with Negative stiffness spring
Position device and the connection of Negative stiffness spring bottom plate fixing device, in the horizontal direction on the outside of Negative stiffness spring structure, are provided with level
Direction Negative stiffness spring compression quantity regulating device；Wherein Negative stiffness spring compression quantity regulating device, Negative stiffness spring bottom plate are fixed
Device and positive rigid spring location adjusting device are connected with bottom plate fixed support device.
Further, the bogey can be plummer, for carrying quality, be activated to act on.
Further, the positive rigid spring of the vertical direction can be uprighting spring, and effect production is activated with plummer
Raw vertical direction motion.
Further, the positive rigid spring location adjusting device can be fixedly connected in block, uprighting spring by central shaft
Mandrel, uprighting spring decrement adjusting knob, uprighting spring end fixation clip, uprighting spring bottom fixed block and uprighting spring
Linear bearing forms；Wherein,
Connection central shaft is fixedly connected with block below plummer, and uprighting spring central shaft, which is fixedly connected with block with central shaft, to be led to
Engagement thread connection is crossed, uprighting spring decrement adjusting knob is installed on uprighting spring central shaft, uprighting spring decrement is adjusted
It is connected uprighting spring by uprighting spring end fixation clip between section knob and uprighting spring bottom fixed block, vertical bullet
Spring central shaft is internal on uprighting spring axial direction to pass through uprighting spring, and uprighting spring is realized by uprighting spring central shaft and led
To being bolted between uprighting spring end fixation clip and uprighting spring bottom fixed block, uprighting spring bottom is fixed
It is bolted between block and uprighting spring linear bearing.Linear bearing provides vertical direction for uprighting spring central shaft to be determined
Position.
Further, the horizontal direction Negative stiffness spring structure can by horizontal spring, horizontal spring end portion connection block,
Horizontal spring end fixation clip composition；Wherein,
Horizontal spring, horizontal spring and horizontal spring end portion connection block are connected between two horizontal spring end portion connection blocks
Between be fixedly connected by horizontal spring end fixation clip.
Further, the Negative stiffness spring connecting cylinder roller can be rolled by horizontal spring connecting cylinder roller, cylinder
Sub- hinged support block and cylindrical roller hinged support block connecting rod composition；Wherein,
Cam opposite side connecting cylinder roller hinged support block is connected in horizontal spring end portion connection block with plummer to connect
Extension bar, cylindrical roller hinged support block and horizontal spring connection circle are sequentially connected in cylindrical roller hinged support block connecting rod end
Connected and installed by articulated manner between post roller, wherein horizontal spring connecting cylinder roller and cylindrical roller hinged support block.
Horizontal spring connecting cylinder roller can be contacted with the plummer connection cam of vertical direction by higher pair, pass through two
Thrust caused by the pre compressed magnitude of side horizontal spring, horizontal spring connecting cylinder roller is connected cam pressing with plummer.
Further, the Negative stiffness spring positioner can be located by connecting plate, horizontal spring straight line by horizontal spring
Slide rail forms；Wherein,
It is fixedly connected with horizontal spring below horizontal spring end portion connection block to be located by connecting plate, horizontal spring is located by connecting plate
Lower section connects horizontal spring line slide rail.Horizontal spring line slide rail provides the positioning and guiding of horizontal direction for horizontal spring.
Further, the horizontal direction Negative stiffness spring compression quantity regulating device can be adjusted by horizontal spring decrement
Knob and horizontal spring adjusting knob fixed block composition；Wherein,
Horizontal spring decrement adjusting knob is connected with horizontal spring adjusting knob fixed block, horizontal spring end portion connection block
The installation decrement of horizontal spring is adjusted by horizontal spring decrement adjusting knob.
Further, the Negative stiffness spring bottom plate fixing device can be horizontal spring bottom plate contiguous block.Horizontal spring
Adjusting knob fixed block, horizontal spring line slide rail are bolted fixed on horizontal spring bottom plate contiguous block.
Further, the bottom plate fixed support device can be made up of pattern board and model feet.Wherein, model bottom
Model feet is fixed with below plate, enhances the adaptability for working condition of this vibration isolator；Fixed above pattern board by bolt mode
There are two horizontal spring bottom plate contiguous blocks and uprighting spring linear bearing, two horizontal spring bottom plate contiguous blocks are located at uprighting spring
Linear bearing both sides.
Further, horizontal positioned damping is also associated with respectively between the horizontal spring end portion connection block of both sides two
Device.In one embodiment, the damper is multiple.
The connection of its each part of the cam bawl negative stiffness structure low frequency vibration isolation device of the present invention is with installing with described convex
The connection of each part of roller negative stiffness structure low frequency vibration isolation device is taken turns with installing with vertical direction positive rigid spring (vertical bullet
Spring) central shaft where and the plane vertical with bottom plate fixed support device centered on face it is symmetrical.Specially：
Model feet is fixed with below pattern board, enhances the adaptability for working condition of this vibration isolator；It is logical above pattern board
Cross bolt mode and be fixed with horizontal spring bottom plate contiguous block and uprighting spring linear bearing.Above horizontal spring bottom plate contiguous block
Horizontal spring line slide rail is bolted to connection, horizontal spring line slide rail provides the positioning of horizontal direction for horizontal spring
It is oriented to.Horizontal spring is connected above two slide rails to be located by connecting plate, is located by connecting in horizontal spring above plate and is fixed horizontal bullet
Spring end portion connection block, horizontal spring, horizontal spring and horizontal spring end are connected between two horizontal spring end portion connection blocks
It is fixedly connected between contiguous block by horizontal spring end fixation clip.In addition, between two horizontal spring end portion connection blocks
It is connected with horizontal positioned damper.Horizontal spring end portion connection block adjusts horizontal bullet by horizontal spring decrement adjusting knob
The installation decrement of spring, horizontal spring decrement adjusting knob are connected with horizontal spring adjusting knob fixed block, horizontal spring rotation
Button fixed block is bolted fixed on pattern board.Cut with scissors in horizontal spring end portion connection block opposite side connecting cylinder roller
Support block connecting rod is connect, connecting cylinder roller hinged support block and horizontal spring connecting cylinder roller in connecting rod end, wherein
Connected and installed by articulated manner between horizontal spring connecting cylinder roller and cylindrical roller hinged support block.Horizontal spring connects
Cylindrical roller contacts with the plummer connection cam higher pair of vertical direction, passes through compression caused by the pre compressed magnitude of horizontal spring
Power, by cylindrical roller and cam pressing.Plummer connection cam is connected by bolt mode with plummer, is connected below plummer
Central shaft is fixedly connected with block, and uprighting spring central shaft is fixedly connected with block with central shaft and is threadedly connected, in uprighting spring
Uprighting spring decrement adjusting knob, uprighting spring decrement adjusting knob and uprighting spring bottom fixed block are installed on central shaft
Between be connected uprighting spring by uprighting spring end fixation clip, uprighting spring is realized by uprighting spring central shaft and led
To being connected between uprighting spring end fixation clip and uprighting spring bottom fixed block and uprighting spring linear bearing by bolt
Connect.Linear bearing provides vertical direction positioning for uprighting spring central shaft.
Cam bawl negative stiffness structure low frequency vibration isolation utensil of the present invention has the following advantages：
1. it can realize that vibration isolator rigidity in the top/bottom latitude of equipoise reduces by adjusting positive and negative rigidity value, so that
Obtaining the vibration isolator has the characteristic of high Static stiffness and low dynamic stiffness, can be applied to the vibration isolation of automotive seat, ship's deck etc.；
2. positive the stiffness elements adjusting means and uprighting spring main body of the present invention, negative stiffness component arrangement and damping unit are equal
There is provided positioner, overall structure is kept strict spaced motion, and impact etc. caused by reducing system imbalance influences；
3. the bottom feet of vibration isolator of the present invention provides more usage scenarios for product；
4. the horizontal spring decrement adjusting knob that the regulation of horizontal spring decrement of the present invention passes through horizontal spring end
Control, in practical operation, can control both ends horizontal amount of spring compression consistent by the number of turns of spinning in and out screw thread；
5. the public horizontal slide rail of horizontal spring and horizontally disposed damper of the present invention, the two is effectively ensured and has moved
Synchronism, in addition, the horizontal slide rail of the design has reserved certain sliding distance, go for different size horizontal spring and
Damper, improve the applicability of global design.
6. the uprighting spring of the present invention can meet the bullet of duty requirements according to different bearer situation and vibration isolation requirement, selection
Spring specification, there is more preferable economy；
7. the horizontal spring number of the present invention can be adjusted according to different vibration isolation requirements and positive and negative stiffness relation；
8. the damper model and quantity of the present invention can change, suppressor system resonant conditions, and encourage feelings to overload
Condition is protected, i.e., with self-protection it is strong the advantages of.
Brief description of the drawings
Fig. 1 is a kind of system composition structured flowchart of cam bawl negative stiffness structure low frequency vibration isolation device of the present invention；
Fig. 2 is the structural representation of the present invention and a kind of cam bawl negative stiffness structure low frequency vibration isolation device in embodiment 2；
Fig. 3 is negative stiffness structure in a kind of cam bawl negative stiffness structure low frequency vibration isolation device in the present invention and embodiment 2
Structural representation；
Fig. 4 is the structural representation of the present invention and a kind of cam bawl negative stiffness structure low frequency vibration isolation device in embodiment 3；
Fig. 5 is a kind of cam bawl negative stiffness structure low frequency vibration isolation device difference initial level in the present invention and embodiment 3
Load-deflection curve in the case of amount of spring compression；
Fig. 6 is the structural representation of the present invention and a kind of cam bawl negative stiffness structure low frequency vibration isolation device in embodiment 4；
Fig. 7 is that a kind of cam bawl negative stiffness structure low frequency vibration isolation device in the present invention and embodiment 4 is initial quiet in difference
Effective vibration distance interval diagram in the case of equilbrium position；
Fig. 8 is the structural representation of the present invention and a kind of cam bawl negative stiffness structure low frequency vibration isolation device in embodiment 5；
Fig. 9 is the present invention and a kind of horizontal damping power of cam bawl negative stiffness structure low frequency vibration isolation device in embodiment 5
Displacement curve.
Wherein reference is：
A is bogey, and B is Negative stiffness spring connecting cylinder roller, and C is that plummer connects cam, D be vertical direction just
Rigid spring, E are positive rigid spring location adjusting device, and F horizontal direction Negative stiffness spring structures, G is Negative stiffness spring positioning
Device, H are Negative stiffness spring bottom plate fixing device, and I is that horizontal direction Negative stiffness spring compresses quantity regulating device, and J consolidates for bottom plate
Determine support meanss；
1 be centered on plummer, 2 axle be fixedly connected block, 3 be plummer connection cam, 4 be the rolling of horizontal spring connecting cylinder
Son, 5 be cylindrical roller hinged support block, 6 be cylindrical roller hinged support block connecting rod, 7 be horizontal spring end portion connection block, 8
For horizontal spring, 9 for be horizontally mounted damper, 10 be horizontal spring end fixation clip, 11 be horizontal spring decrement regulation
Knob, 12 be horizontal spring adjusting knob fixed block, 13 be uprighting spring central shaft, 14 be uprighting spring decrement regulation rotation
Button, 15 be uprighting spring end fixation clip, 16 be uprighting spring, 17 be uprighting spring bottom fixed block, 18 be uprighting spring
Linear bearing, 19 be horizontal spring be located by connecting plate, 20 be horizontal spring line slide rail, 21 be horizontal spring bottom plate contiguous block,
22 it is pattern board, 23 is model feet.
Embodiment
The present invention will be described below in conjunction with the accompanying drawings.It should be understood that following examples are used to illustrate the present invention, but it is not used to
Limit the scope of the present invention.
Embodiment 1
As shown in figure 1, it is a kind of system composition structured flowchart of cam bawl negative stiffness structure low frequency vibration isolation device of the present invention.
Wherein, the annexation of each comprising modules is as follows：
Bogey A center lower ends are connected cam C connections with plummer, are negative stiffness in plummer connection cam C both sides
Spring connecting cylinder roller B, is connected between its cam C and cylindrical roller B by higher pair, and installation is connected in cam C lower section
The positive rigid spring D of vertical direction and positive rigid spring location adjusting device E；Negative stiffness spring connecting cylinder roller B and level side
To the F connections of Negative stiffness spring structure, Negative stiffness spring structure F and Negative stiffness spring positioner G and Negative stiffness spring bottom plate
Fixing device H connections, in the horizontal direction on the outside of Negative stiffness spring structure F, horizontal direction Negative stiffness spring decrement tune is installed
Regulating device I；Wherein Negative stiffness spring compression quantity regulating device I, Negative stiffness spring bottom plate fixing device H and the positioning of positive rigid spring
Adjusting means E is connected with bottom plate fixed support device J, and bottom plate fixed support device J is fixed in plane base.
Embodiment 2
As shown in Figure 2-5；Wherein, Fig. 2 is that a kind of structure of cam bawl negative stiffness structure low frequency vibration isolation device of the present invention is shown
It is intended to；Fig. 3 is the structural representation of negative stiffness structure in a kind of cam bawl negative stiffness structure low frequency vibration isolation device of the present invention；Fig. 4
It is the structural representation of horizontal spring bottom plate contiguous block in a kind of cam bawl negative stiffness structure low frequency vibration isolation device of the present invention；Fig. 5
It is the structural representation of pattern board in a kind of cam bawl negative stiffness structure low frequency vibration isolation device of the present invention.
Reference picture 2 and Fig. 3, a kind of cam bawl negative stiffness structure low frequency vibration isolation device proposed in the present embodiment include model
Bottom plate 22, the lower section of pattern board 22 are fixed with model feet 23, enhance the adaptability for working condition of this vibration isolator；On pattern board 22
Side is fixed with two horizontal spring bottom plate contiguous blocks 21 and uprighting spring linear bearing 18, two horizontal springs by bolt mode
Bottom plate contiguous block 21 is located at the both sides of uprighting spring linear bearing 18.Pass through bolt above side horizontal spring bottom plate contiguous block 21
Two horizontal spring line slide rails 20 are fixedly connected with, horizontal spring line slide rail 20 is that horizontal spring 8 provides determining for horizontal direction
Position is oriented to.Connection horizontal spring is located by connecting plate 19 respectively above two line slide rails 20, is located by connecting plate in horizontal spring
The fixed horizontal spring end portion connection block 7 in 19 tops, connects horizontal spring 8 between two horizontal spring end portion connection blocks 7, horizontal
It is fixedly connected between spring 8 and horizontal spring end portion connection block 7 by horizontal spring end fixation clip 10.In addition, in side
Horizontal positioned damper 9 is connected between two horizontal spring end portion connection blocks 7.Horizontal spring end portion connection block 7 passes through water
Coach spring decrement adjusting knob 11 adjusts the installation decrement of horizontal spring 8, horizontal spring decrement adjusting knob 11 and water
Coach spring adjusting knob fixed block 12 is connected, and horizontal spring adjusting knob fixed block 12 is bolted fixed to horizontal spring
On bottom plate contiguous block 21.In the opposite side connecting cylinder roller hinged support block connecting rod 6 of horizontal spring end portion connection block 7, connecting
The end connecting cylinder roller hinged support block 5 of extension bar 6 and horizontal spring connecting cylinder roller 4, wherein horizontal spring connecting cylinder
Connected and installed by articulated manner between roller 4 and cylindrical roller hinged support block 5.Horizontal spring connecting cylinder roller 4 is with erecting
Nogata to plummer connect the contact of cam 3 higher pair, by thrust caused by the pre compressed magnitude of both sides horizontal spring 8, by circle
Post roller 4 compresses with cam 3.Plummer connection cam 3 is connected by bolt mode with plummer 1, during the lower section of plummer 1 connects
Mandrel is fixedly connected with block 2, and uprighting spring central shaft 13 is fixedly connected with block 2 with central shaft and is threadedly connected, in vertical bullet
Uprighting spring decrement adjusting knob 14, uprighting spring decrement adjusting knob 14 and uprighting spring bottom are installed on spring central shaft 13
It is connected uprighting spring 16 by uprighting spring end fixation clip 15 between portion's fixed block 17, uprighting spring 16 is by vertical
Spring center axle 13, which is realized, to be oriented to, and passes through bolt between uprighting spring end fixation clip 15 and uprighting spring bottom fixed block 17
Connection, is bolted between uprighting spring bottom fixed block 17 and uprighting spring linear bearing 18.Linear bearing 18 is perpendicular
Straight spring center axle 13 provides vertical direction positioning.
The course of work and principle of cam bawl negative stiffness structure low frequency vibration isolation device in the present embodiment are as follows：
In the case where plummer 1 is activated effect, the uprighting spring 16 being connected on plummer 1 produces motion, carries simultaneously
Platform connects cam 3 and produces relative motion with horizontal spring connecting cylinder roller 4, then horizontal spring 8 and horizontal damping device 9 produce fortune
It is dynamic, and moved along a straight line in strict accordance with horizontal direction, so as to form overall positive and negative Stiffness device, and there is nonlinear dampling production
It is raw, so that vibration isolator produces low frequency vibration isolation effect.The present embodiment is in parallel by positive and negative stiffness elements, and all kinds of by selecting
The rigidity value and horizontal spring connecting cylinder roller 4 of other spring connect the radius of cam 3 with plummer, realize that this vibration isolator exists
The quasi- zero stiffness of equipoise.
Horizontal spring 8 is connected by end fixation clip 10 with horizontal spring end portion connection block 7, and horizontal damping device 9 passes through
Bolted mode is connected with horizontal spring end portion connection block 7, and simultaneously, the bottom of horizontal spring end portion connection block 7 passes through
The horizontal spring plate 19 that is located by connecting is connected with horizontal spring line slide rail 20, and strict guarantee horizontal spring 8 and horizontal damping device 9 exist
The motion of horizontal direction.The uprighting spring central shaft 13 of vertical direction is the offer guiding of uprighting spring 16, and uprighting spring center
Axle 13 realizes the positioning of vertical direction further through uprighting spring linear bearing 18, and this guarantees the motion of uprighting spring 16 is strict
Carried out according to vertical direction.
Embodiment 3
Fig. 4 show a kind of structural representation of cam bawl negative stiffness structure low frequency vibration isolation device of the present embodiment.With reality
The difference of example 2 is applied to be to adjust horizontal spring decrement adjusting knob 11.Adjust the regulation of horizontal spring decrement
Knob can realize the regulation of horizontal spring decrement under original state, thus it is possible to vary the negative stiffness value of vibration isolator, enhance every
Shake the adaptability for working condition of device.
Fig. 5 is a kind of cam bawl negative stiffness structure low frequency vibration isolation device difference initial level amount of spring compression situation of the present invention
Under load-deflection curve.Parameter δ in figure is horizontal spring decrement and cam and the ratio of cylindrical roller radius sum；x
Represent the displacement of original state；K represents integrally-built rigidity.As can be seen that horizontal spring compression quantitative change is firm greatly from curve
Degree characteristic curve moves down, i.e. with the increase of horizontal spring decrement, the negative stiffness value increase of the negative stiffness structure of vibration isolator.
Embodiment 4
Fig. 6 show a kind of structural representation of cam bawl negative stiffness structure low frequency vibration isolation device of the present embodiment.Fig. 7 institutes
A kind of cam bawl negative stiffness structure low frequency vibration isolation device for being shown as this example is effective in the case of different initial equipoises
Vibration distance interval diagram.
The present embodiment difference from Example 3 be by adjust uprighting spring adjusting means adjust original state under every
Shake the initial position of device uprighting spring, so as to change the vibration distance section of vibration isolator.It can be seen from figure 7 that change vibration isolation
The initial equipoise of device, when the center of circle of equipoise cam and cylindrical roller on the same line when, vibration isolator has
Maximum effective vibration distance section, also, the mechanical characteristic of vibration isolator is in symmetry characteristic, can lift the monolithic stability of vibration isolator
Property.
Embodiment 5
Fig. 8 show a kind of structural representation of cam bawl negative stiffness structure low frequency vibration isolation device in the present embodiment.Fig. 9 institutes
It is shown as a kind of horizontal damping power displacement curve of cam bawl negative stiffness structure low frequency vibration isolation device in the present embodiment.
The present embodiment difference from Example 4 is the installation for changing horizontal damping device, and horizontal damping device can be
System provides nonlinear dampling power.Horizontal direction damping force for vibration isolator is：
Wherein c be damper damped coefficient, r1For cam radius, r2For cylindrical roller radius, x is vertical displacement.
Corresponding curve is as shown in Figure 9.From curve as can be seen that with the corresponding caused damping of the increase of damped coefficient
Power is bigger, and damping force is bigger with change in displacement rate.For different operating modes, the damping with different damping coefficient can be selected
Device is installed.
Although above with general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to the scope of protection of present invention.
Claims (10)
- A kind of 1. cam bawl negative stiffness structure low frequency vibration isolation device, it is characterised in that the low frequency vibration isolation device include bogey, Negative stiffness spring connecting cylinder roller, plummer connection cam, the positive rigid spring of vertical direction, positive rigid spring positioning regulation dress Put, horizontal direction Negative stiffness spring structure, Negative stiffness spring positioner, Negative stiffness spring bottom plate fixing device, horizontal direction Negative stiffness spring compresses quantity regulating device and bottom plate fixed support device；Wherein,Bogey center lower end is connected cam connection with plummer, and connect cam both sides in plummer connects for Negative stiffness spring Cylindrical roller, wherein plummer are connected and connected between cam and Negative stiffness spring connecting cylinder roller for higher pair, are connected in plummer Connect the lower section connection installation positive rigid spring of vertical direction of cam and positive rigid spring location adjusting device；Negative stiffness spring connects Cylindrical roller is connected with horizontal direction Negative stiffness spring structure, and horizontal direction Negative stiffness spring structure fills with Negative stiffness spring positioning Put and Negative stiffness spring bottom plate fixing device connects, in the horizontal direction on the outside of Negative stiffness spring structure, horizontal direction is installed Negative stiffness spring compresses quantity regulating device；Wherein Negative stiffness spring compression quantity regulating device, Negative stiffness spring bottom plate fixing device It is connected with positive rigid spring location adjusting device with bottom plate fixed support device.
- 2. cam bawl negative stiffness structure low frequency vibration isolation device as claimed in claim 1, it is characterised in that the positive rigid spring Location adjusting device is fixedly connected with block, uprighting spring central shaft, uprighting spring decrement adjusting knob, uprighting spring by central shaft End fixation clip, uprighting spring bottom fixed block and uprighting spring linear bearing composition；Wherein,Connection central shaft is fixedly connected with block below plummer, and uprighting spring central shaft is fixedly connected with block with central shaft and passes through screw thread side Formula connect, on uprighting spring central shaft install uprighting spring decrement adjusting knob, uprighting spring decrement adjusting knob with It is connected uprighting spring by uprighting spring end fixation clip between the fixed block of uprighting spring bottom, uprighting spring central shaft It is internal on uprighting spring axial direction to pass through uprighting spring, uprighting spring end fixation clip and uprighting spring bottom fixed block Between be bolted, be bolted between uprighting spring bottom fixed block and uprighting spring linear bearing.
- 3. cam bawl negative stiffness structure low frequency vibration isolation device as claimed in claim 2, it is characterised in that the horizontal direction is born Rigid spring structure is made up of horizontal spring, horizontal spring end portion connection block, horizontal spring end fixation clip；Wherein,Horizontal spring is connected between two horizontal spring end portion connection blocks, between horizontal spring and horizontal spring end portion connection block It is fixedly connected by horizontal spring end fixation clip.
- 4. cam bawl negative stiffness structure low frequency vibration isolation device as claimed in claim 3, it is characterised in that the Negative stiffness spring Connecting cylinder roller is connected by horizontal spring connecting cylinder roller, cylindrical roller hinged support block with cylindrical roller hinged support block Bar forms；Wherein,Cam opposite side connecting cylinder roller hinged support block connecting rod is connected with plummer in horizontal spring end portion connection block, Cylindrical roller hinged support block and the rolling of horizontal spring connecting cylinder are sequentially connected in cylindrical roller hinged support block connecting rod end Connected and installed by articulated manner between son, wherein horizontal spring connecting cylinder roller and cylindrical roller hinged support block.
- 5. cam bawl negative stiffness structure low frequency vibration isolation device as claimed in claim 4, it is characterised in that the Negative stiffness spring Positioner is made up of be located by connecting plate, horizontal spring line slide rail of horizontal spring；Wherein,It is fixedly connected with horizontal spring below horizontal spring end portion connection block to be located by connecting plate, horizontal spring is located by connecting below plate Connect horizontal spring line slide rail.
- 6. cam bawl negative stiffness structure low frequency vibration isolation device as claimed in claim 5, it is characterised in that the horizontal direction is born Rigid spring compression quantity regulating device is made up of horizontal spring decrement adjusting knob and horizontal spring adjusting knob fixed block；Its In,Horizontal spring decrement adjusting knob is connected with horizontal spring adjusting knob fixed block, and horizontal spring end portion connection block passes through Horizontal spring decrement adjusting knob adjusts the installation decrement of horizontal spring.
- 7. cam bawl negative stiffness structure low frequency vibration isolation device as claimed in claim 6, it is characterised in that the Negative stiffness spring Bottom plate fixing device is horizontal spring bottom plate contiguous block；Horizontal spring adjusting knob fixed block, horizontal spring line slide rail pass through Bolt connection is fixed on horizontal spring bottom plate contiguous block.
- 8. cam bawl negative stiffness structure low frequency vibration isolation device as claimed in claim 7, it is characterised in that the bottom plate fixes branch Support arrangement is made up of pattern board and model feet；Wherein, it is fixed with model feet below pattern board；It is logical above pattern board Cross bolt mode and be fixed with two horizontal spring bottom plate contiguous blocks and uprighting spring linear bearing, two horizontal spring bottom plate connections Block is located at uprighting spring linear bearing both sides.
- 9. the cam bawl negative stiffness structure low frequency vibration isolation device as any one of claim 3-8, it is characterised in that two Horizontal positioned damper is also associated with respectively between the horizontal spring end portion connection block of side two.
- 10. cam bawl negative stiffness structure low frequency vibration isolation device as claimed in claim 1, it is characterised in that the cam bawl The connection of each part of negative stiffness structure low frequency vibration isolation device is with installation with where the central shaft of the positive rigid spring of vertical direction And face is symmetrical centered on the plane vertical with bottom plate fixed support device.
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| CN201711148637.5A CN107740843A (en) | 2017-11-17 | 2017-11-17 | A kind of cam bawl negative stiffness structure low frequency vibration isolation device |
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| CN109751361A (en) * | 2019-01-25 | 2019-05-14 | 哈尔滨工业大学 | A kind of negative stiffness element and negative stiffness characteristic generation method and application with equilbrium position self-regulation ability |
| CN110107632A (en) * | 2019-06-03 | 2019-08-09 | 江南大学 | A kind of positive and negative Stiffness low frequency vibration isolation device coupling dynamic vibration absorber |
| CN110190778A (en) * | 2019-06-05 | 2019-08-30 | 北京市劳动保护科学研究所 | A kind of low frequency vibration isolation and piezoelectric energy-capturing coupling device |
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| CN113983099A (en) * | 2021-10-29 | 2022-01-28 | 福州大学 | Three-dimensional vibration isolator based on metal rubber and adjustable in height and working method of three-dimensional vibration isolator |
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