CN114934974A - Large-amplitude horizontal two-degree-of-freedom vibration isolator - Google Patents
Large-amplitude horizontal two-degree-of-freedom vibration isolator Download PDFInfo
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- CN114934974A CN114934974A CN202210520651.8A CN202210520651A CN114934974A CN 114934974 A CN114934974 A CN 114934974A CN 202210520651 A CN202210520651 A CN 202210520651A CN 114934974 A CN114934974 A CN 114934974A
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- rigid hinge
- vibration isolator
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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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- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
Abstract
The invention relates to a large-amplitude horizontal two-degree-of-freedom vibration isolator. This isolator includes: a fixed platform; the inner rigid hinged branch chain is connected to the fixed platform through a hook hinge; the motion control platform is connected with the inner rigid hinge branched chain through a Hooke hinge; the outer rigid hinge chain is hinged with the inner rigid hinge chain; and the load platform is used for bearing vibration isolation objects and is connected with the outer rigid hinge branched chain through a Hooke hinge. The large-amplitude horizontal two-degree-of-freedom vibration isolator forms two serially connected UU parallel mechanisms, so that the load platform can do quasi-planar linear motion near the mass center shaft through the inner rigid hinge branch chain and the outer rigid hinge branch chain, the whole vibration isolator forms a single-pendulum structure, the pendulum length of the vibration isolator is extended to the maximum extent, and the self natural frequency of the large-amplitude horizontal two-degree-of-freedom vibration isolator can be effectively reduced.
Description
Technical Field
The disclosure relates to the technical field of vibration isolation, in particular to a large-amplitude horizontal two-degree-of-freedom vibration isolator.
Background
With the continuous development of scientific technology, especially the shock absorption and vibration isolation requirements of a large number of high-end precision instruments and equipment applied in dynamic environment, people pay more attention to the research of vibration control. Vibration isolation has become one of the most effective and practical methods, and passive vibration isolation is widely used.
The vibration has three degrees of freedom in the vertical direction and the horizontal direction, the vibration in the vertical direction is the most common vibration in life, and the vibration isolation research on the vibration isolation is very mature, such as linear vibration isolation, nonlinear active and passive vibration isolation and the like. The development of horizontal vibration isolation mechanisms has been relatively slow. Common horizontal vibration isolation mechanisms are based on the simple pendulum principle to perform vibration isolation, and include a folding pendulum, a conical pendulum, laminated rubber, a three-line pendulum, a reverse pendulum, a positive and reverse pendulum and other forms, along with the deep research of gravitational wave, a form of combining various pendulums such as a scissors pendulum and a folding pendulum appears, wherein the laminated rubber is difficult to achieve low inherent frequency due to inherent characteristics of the laminated rubber. In addition, the natural frequency of the mechanism related to the simple pendulum is related to the pendulum length, and the reduction of the natural frequency means that the pendulum length must be increased, so that the height of the mechanism is increased, and the size of the mechanism is overlarge.
Disclosure of Invention
In view of the above, there is a need for a high amplitude horizontal two degree of freedom vibration isolator that aims to lower the natural frequency of the vibration isolator.
Therefore, the invention provides a large-amplitude horizontal two-degree-of-freedom vibration isolator, which comprises:
a fixed platform;
the inner rigid hinged branch chain is connected to the fixed platform through a hook hinge;
the motion control platform is connected with the inner rigid hinge branched chain through a Hooke hinge;
the outer rigid hinge chain is hinged with the inner rigid hinge chain;
and the load platform is used for bearing vibration isolation objects and is connected with the outer rigid hinge branched chain through a Hooke hinge.
Preferably, the top of the inner rigid hinge branched chain is connected with the outer rigid hinge branched chain through a ball pair or a Hooke hinge.
Preferably, the number of the inner rigid hinge chains is at least three, and the inner rigid hinge chains are uniformly distributed along the circumferential direction of the fixed platform.
Preferably, the size, material and quality of the inner rigid hinge chain are the same.
Preferably, the load platform is located below the fixed platform, and the bottom of the inner rigid hinged chain is connected with the fixed platform; the top of the outer rigid hinge branched chain is connected with the top of the inner rigid hinge branched chain through a ball pair, and the bottom of the outer rigid hinge branched chain is connected with the load platform through a Hooke hinge.
Preferably, the outer rigid hinge chain comprises a horizontal connecting part and a vertical connecting part, the horizontal connecting part extends along the horizontal direction, one end of the horizontal connecting part is connected to the inner rigid hinge chain through a ball pair, and the other end of the horizontal connecting part is connected to the top of the vertical connecting part; the vertical connecting part extends along the vertical direction, and the bottom of the vertical connecting part is connected with the load platform through a hook hinge.
Preferably, the number of the external rigid hinge chains is at least three, and the external rigid hinge chains are uniformly distributed along the circumferential direction of the load platform.
Preferably, the size, material and quality of the external rigid hinged chain are the same.
Preferably, the robot further comprises a mass center adjusting platform, wherein the mass center adjusting platform is used for bearing a mass block, is positioned above the motion control platform and is connected with the top of the vertical connecting part of the outer rigid hinge branched chain through a Hooke hinge.
Preferably, the device further comprises a cassette, wherein the cassette comprises:
the connecting rod is connected to the fixed platform;
a swing assembly including a connecting seat connected to the connecting rod, a cross member extending in a horizontal direction and rotatably connected to the connecting seat, and a longitudinal member extending in a horizontal direction and rotatably connected to the cross member;
and the fixed support column extends along the vertical direction, one end of the fixed support column is connected with the transverse piece, and the other end of the fixed support column is connected with the mass center adjusting platform through a ball pair.
Compared with the prior art, the inner rigid hinge branched chain of the large-amplitude horizontal two-degree-of-freedom vibration isolator is connected with the fixed platform and the motion control platform through the Hooke hinge, the outer rigid hinge branched chain is connected with the load platform through the Hooke hinge, and the inner rigid hinge branched chain is connected through the Hooke hinge to form two serially-connected UU parallel mechanisms.
Drawings
In order to illustrate the embodiments more clearly, the drawings that will be needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are some examples of the disclosure, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
Fig. 1 is a structural schematic diagram of a large-amplitude horizontal two-degree-of-freedom vibration isolator.
Fig. 2 is a schematic structural view of a hooke joint.
Fig. 3 is a schematic structural diagram of the fixed platform, the inner rigid hinge chain and the motion control platform.
Fig. 4 is a schematic structural diagram of the fixed platform, the clamping seat and the mass center adjusting platform.
Fig. 5 is a schematic structural diagram of the clamping seat and the center-of-mass adjusting platform in a disassembled state.
Fig. 6 is a schematic structural diagram of the fixed platform, the motion control platform, the inner rigid hinge chain and the outer rigid hinge chain.
Fig. 7 is a schematic structural view of the center of mass adjustment platform, the outer rigid hinged chain and the loading platform.
Description of the main elements
The following detailed description will further illustrate the disclosure in conjunction with the above-described figures.
Detailed Description
In order that the above objects, features and advantages of the present disclosure can be more clearly understood, a detailed description of the present disclosure will be given below with reference to the accompanying drawings and detailed description. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, and the described embodiments are merely some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by one of ordinary skill in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.
In various embodiments, for convenience in description and not limitation of the disclosure, the term "coupled" as used in the specification and claims of the present disclosure is not limited to physical or mechanical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
Fig. 1 is a structural schematic diagram of a large-amplitude horizontal two-degree-of-freedom vibration isolator. As shown in fig. 1, the large-amplitude horizontal two-degree-of-freedom vibration isolator comprises a fixed platform 10, an inner rigid hinge chain 20, a motion control platform 21, a clamping seat 60, a center-of-mass adjusting platform 50, an outer rigid hinge chain 30 and a loading platform 40. The fixed platform 10 can be placed on a support rack or other objects and is used for supporting the centroid adjusting platform 50 and the load platform 40 through the inner rigid hinge chain 20 and the outer rigid hinge chain 30, the clamping seat 60 limits the movement trend of the centroid adjusting platform 50, and the load platform 40 is used for placing the vibration isolation object 81, so that the load platform 40 can only move in two directions in the horizontal direction, and vibration isolation of the vibration isolation object 81 under large-amplitude vibration and disturbance is realized.
In this embodiment, the inner rigid hinge arm 20 and the outer rigid hinge arm 30 are connected to each other by a hook hinge 90. The Hooke's hinge 90 is a two-degree-of-freedom hinge, is a structure of U pair connection, is widely applied to the fields of mechanical arms, transmission and the like, and is an indispensable transmission part of various motion mechanisms. For ease of understanding, the structure of one hooke's hinge 90 is first described below in conjunction with fig. 2, by way of example.
Fig. 2 is a schematic structural view of a hooke joint 90. As shown in fig. 2, the hooke's joint 90 connects the first link 91 and the second link 93 via a rotation shaft 92. The first connecting member 91 is rotatably connected to the rotating shaft 92 through a shaft extending along the X-axis direction, and the second connecting member 93 is rotatably connected to the rotating shaft 92 through a shaft extending along the Y-axis direction, so that the first connecting member 91 can rotate around the X-axis direction relative to the second connecting member 93, and at the same time, can rotate around the Y-axis relative to the second connecting member 93, that is, two components connected by the hooke hinge 90 can simultaneously realize rotation with two degrees of freedom (i.e., U-pair connection).
Fig. 3 is a schematic structural diagram of the fixed platform 10, the inner rigid hinge chain 20 and the motion control platform 21. As shown in fig. 3. The fixed platform 10 is used for supporting the whole large-amplitude horizontal two-degree-of-freedom vibration isolator. The inner rigid hinge chain 20 is a rigid connection structure, the number of the inner rigid hinge chain 20 may be three or more, but the size, material, quality and other factors of each inner rigid hinge chain 20 are within a preset range, and a plurality of inner rigid hinge chains 20 which are completely consistent are preferably used. The plurality of internal rigid hinge branched chains 20 are uniformly distributed along the circumferential direction, are symmetrically distributed around the central axis, and are connected to the fixed platform 10 at the bottom ends through hook hinges 90. The motion control platform 21 is generally a circular ring that surrounds the inner rigid hinge arm 20. The motion control platform 21 is located above the fixed platform 10 and connected to the middle position of the inner rigid hinge chain 20 through the hooke hinge 90, so that the relative spatial positions of the three inner rigid hinge chains 20 can be kept unchanged.
Fig. 4 is a schematic structural view of the fixed platform 10, the clamping base 60 and the centroid adjusting platform 50. As shown in fig. 4, a center of mass adjusting platform 50 is disposed above the fixed platform 10. In this embodiment, the fixed platform 10 is connected to the centroid adjusting platform 50 through the clamping base 60. The clamping seat 60 comprises a connecting rod 61, a swinging assembly 62 and a fixed support 63. The number of the connecting rods 61 may be several, for example four as shown in fig. 4, the bottom of the connecting rods 61 is fixedly connected to the fixed platform 10, and the top is connected to the swing assembly 62. The swing assembly 62 is located above the fixed platform 10 and functions similarly to the hooke joint 90 for enabling two degrees of freedom of swing. The fixed post 63 extends in a vertical direction and has one end connected to the cross member 622 and the other end connected to the centroid adjusting platform 50 via the ball set 70.
Fig. 5 is a schematic structural view of the clamping seat 60 and the centroid adjusting platform 50 in a disassembled state. As shown in fig. 5, the swing assembly 62 includes a connecting seat 621, a cross member 622, and a longitudinal member 64. The connecting base 621 is fixedly connected to the end of the connecting rod 61, and the four connecting rods 61 are connected to the connecting base 621 along a tapered structure. The connecting seat 621 is provided with a first connecting hole 6211 along the axial direction of the first connecting hole 6211, which is the X-axis direction shown in fig. 5. The cross member 622 has a connecting shaft 6222 corresponding to the first connecting hole 6211, and the connecting shaft 6222 extends axially along the X-axis direction shown in fig. 5, and is configured to be rotatably inserted into the first connecting hole 6211 of the connecting seat 621, so as to enable the cross member 622 to rotate around the X-axis direction shown in fig. 5 relative to the connecting seat 621. In addition, the transverse member 622 is provided with a second connecting hole 6221 extending along the Y-axis direction shown in FIG. 5, and correspondingly, the longitudinal member 64 is substantially in a rotating shaft structure extending along the Y-axis direction shown in FIG. 5 for being rotatably inserted into the second connecting hole 6221. The fixed strut 63 is fixedly connected to the longitudinal member 64, and the longitudinal member 64 performs the function of rotating around the Y-axis relative to the transverse member 622. Therefore, the swing member 62 can perform the function of rotating the fixing support 63 relative to the connecting seat 621 about the X-axis direction and about the Y-axis direction simultaneously.
Referring again to fig. 5, the bottom of the fixed post 63 is pivotally connected to the cross member 622 by the longitudinal member 64 and the top is connected to the center of mass adjustment platform 50 by the ball set 70. In the present embodiment, the ball pair 70 may be applied to other structures in the present embodiment, as an example. Specifically, the ball pair 70 includes a ball 72 and a receptacle 71 for receiving the ball 72. One end of the ball 72 is connected to the top of the fixing post 63, and the other end is inserted into the cavity 71. In this embodiment, a sleeve 51 is disposed on a bottom surface of the centroid adjusting platform 50, and the cavity 71 is disposed at an end of the sleeve 51 facing the fixed support 63. In use, the ball 72 is inserted into the cavity 71 of the sleeve 51 to effect rotation of the centroid adjusting platform 50 relative to the fixed support 63.
Fig. 6 is a schematic structural diagram of the fixed platform 10, the motion control platform 21, the inner rigid hinge chain 20, and the outer rigid hinge chain 30. As shown in fig. 6, the fixed platform 10 is connected to the load platform 40 by the inner rigid hinge arm 20 and the outer rigid hinge arm 30. The top of the inner rigid hinge leg 20 is connected to the outer rigid hinge leg 30 by a ball pair 70 or a hook hinge 90. The structure of the ball pair 70 is partially shown in fig. 5, and is similar to the structure of the ball pair 70 connected to the fixing support 63, and the detailed description thereof is omitted. Although fig. 6 shows the inner rigid hinge arm 20 connected to the outer rigid hinge arm 30 by the ball pair 70, since the degree of freedom of the outer rigid hinge arm 30 is limited by the center of mass adjustment platform 50, the relative movement of the inner rigid hinge arm 20 and the outer rigid hinge arm 30 through the ball pair 70 has only two degrees of freedom, and the ball pair 70 functions only as a hooke joint 90.
The number of the inner rigid hinge chains 20 is at least three, and the inner rigid hinge chains are uniformly distributed along the circumferential direction of the fixed platform 10 and are symmetrically distributed around the central axis. The tolerance in size, material and mass between each outer rigid hinge arm 30 is within a predetermined range, and preferably the outer rigid hinge arms 30 are identical, including but not limited to size, material and mass.
The outer rigid hinge chain 30 is a rigid connection structure, the number of the outer rigid hinge chain 30 may be three or more, but the size, material, quality and other factors of each outer rigid hinge chain 30 are within a preset range, and a plurality of outer rigid hinge chains 30 which are completely identical are preferably used. The plurality of outer rigid hinge arms 30 are uniformly distributed in the circumferential direction and symmetrically distributed around the central axis. In this embodiment, the outer rigid hinge chain 30 includes a horizontal connecting portion 31 and a vertical connecting portion 32. The horizontal connecting portion 31 extends in the horizontal direction, and one end of the horizontal connecting portion is connected to the inner rigid hinge branch 20 through a ball pair 70 or a hook hinge 90, and the other end of the horizontal connecting portion is fixedly connected to the top of the vertical connecting portion 32. The vertical connecting portion 32 extends in a vertical direction and is connected at the bottom to the bottom surface of the load platform 40 by a hook joint 90.
The load platform 40 is of a generally flat plate-like structure for carrying the vibration isolation object 81. The load platform 40 is located below the fixed platform 10 and is connected to the outer rigid hinge arm 30 by a hook hinge 90.
Fig. 7 is a schematic structural view of the centroid adjustment platform 50, the outer rigid hinge chain 30 and the loading platform 40. As shown in fig. 7, the center of mass adjustment platform 50 is used to carry a mass 80, is located above the motion control platform 21, and is connected to the top of the vertical connecting portion 32 of the outer rigid hinge arm 30 by a hooke joint 90. Specifically, the top of the horizontal connecting portion 31 of the outer rigid hinge branch 30 is connected to the bottom surface of the centroid adjusting platform 50 through the hooke joint 90, and the vertical connecting portion 32 of the outer rigid hinge branch 30 is connected to the bottom surface of the loading platform 40 through the hooke joint 90.
Referring back to fig. 3 and 7, the fixed support 63 serves as a connecting member between the center of mass adjusting platform 50 and the fixed platform 10, so as to limit the movement tendency of the center of mass adjusting platform 50. When the vibration isolation objects 81 corresponding to different masses are provided, the position of the center of mass of the vibration isolator as a whole is changed due to the change in the mass of the vibration isolation objects 81. Therefore, the mass block 80 can be added on the outward rigid hinge chain 30, the mass and the shape of the mass block 80 can be changed, or a plurality of mass blocks 80 can be added for linear arrangement, so that the position of the mass center axis of the vibration isolator can be kept unchanged, the vibration isolator is always in a quasi-zero rigidity balance position, and at the moment, the vibration isolator is close to a quasi-zero rigidity state (namely the inherent frequency of the vibration isolator is close to 0), and the aim of adapting to vibration isolation objects 81 with different masses can be fulfilled through simple operation.
On the whole, a fixed platform 10 and a motion control platform 21 of the large-amplitude horizontal two-degree-of-freedom vibration isolator are connected with a plurality of inner rigid hinge branch chains 20 through U pairs to form a 3-UU parallel mechanism; the plurality of outer rigid hinged branches 30 are connected with the inner rigid hinged branch 20 and the load platform 40 through the U pair, so that the motion control platform 21 and the load platform 40 form another 3-UU parallel mechanism, and the two 3-UU parallel mechanisms are connected in series through the outer rigid hinged branches 30 and the inner rigid hinged branches 20 under the U pair connection. Therefore, the whole large-amplitude horizontal two-degree-of-freedom vibration isolator is equivalent to a series mechanism of two 3-UU parallel mechanisms. According to the parallel mechanism analysis method, those skilled in the art can find that the load platform 40 can only realize the movement with 2 directions of freedom in the movement space, that is, the movement along the X-axis direction and the Y-axis direction in the horizontal plane. At this time, the load platform 40 cannot participate in the rotational motion, and when the load platform is excited by the outside in any direction, the load platform 40 can only do a small range of quasi-planar linear motion along the Y-axis direction and the Y-axis direction in the horizontal plane, so that the vibration in any horizontal direction can be coped with. Therefore, the vibration isolator can be generally regarded as a simple pendulum system, so that the principle of simple pendulum can be applied to achieve horizontal vibration isolation of the vibration isolator.
As known to those skilled in the art, according to the definition of vibration isolation, when the external low frequency, ultra-low frequency vibration and disturbance frequency are greater than the natural frequency of the vibration isolator
In time, low-frequency and ultra-low-frequency vibration isolation can be realized, so that the vibration isolator is required to have lower natural frequency. The vibration isolator provided by the embodiment utilizes the simple pendulum principle and has the following formula:
wherein, omega is the natural frequency of the vibration isolator, g is the gravity acceleration, and l is the pendulum length of the simple pendulum.
The load platform 40 loads the vibration isolation object 81 to do quasi-planar linear motion near the mass center axis, and the vibration isolator can have lower natural frequency due to the largest pendulum length of the simple pendulum system, so that the bandwidth of the vibration isolator can be increased, and the vibration isolation of low frequency or ultralow frequency is realized. The height and the volume of the conventional horizontal vibration isolator are reduced because the swing length of the conventional horizontal vibration isolator is increased by increasing the height and the volume.
Meanwhile, the large-amplitude horizontal two-degree-of-freedom vibration isolator has strong bearing capacity due to the fact that one load platform 40 is supported by the plurality of external rigid hinge chains 30, can bear large-amplitude external force and simultaneously keep stability, and therefore can realize vibration isolation of large-amplitude vibration and disturbance. Therefore, the vibration isolator adopts the design of a parallel mechanism, improves the accuracy while increasing the stability, can simultaneously adapt to the conditions of large amplitude and micro vibration, and is suitable for the protection of large-scale devices and the environmental conditions of micro vibration.
When it is desired to isolate the vibration-isolating object 81, the fixed platform 10 is fixed above the vibration source to determine the spatial position of the vibration isolator, and the mass 80 is placed on the center-of-mass adjustment platform 50. When the vibration isolator is unloaded, the sizes and the qualities of the inner rigid hinge chain 20 and the outer rigid hinge chain 30 and the quantity, the quality and the arrangement mode of the mass blocks 80 on the mass center adjusting platform 50 are adjusted to find a balance position, so that the vibration isolator can realize a quasi-zero rigidity position.
Then, the vibration isolation object 81 is placed on the load platform 40, and the mass and the layout of the mass block 80 are adjusted, so that the position of the mass center of the vibration isolator is restored to the balance position, and a nonlinear quasi-stiffness mechanism is formed. At the moment, when the vibration isolator is excited by vibration in any horizontal direction, the motion trend of the load platform 40 is close to a quasi-plane straight line, so that the cycloid length is greatly increased, the natural frequency of the vibration isolator is reduced, and low-frequency and ultralow-frequency vibration isolation is realized.
In summary, on one hand, the inner rigid hinge branch chain 20 of the large-amplitude horizontal two-degree-of-freedom vibration isolator is connected with the fixed platform 10 and the motion control platform 21 through the hooke hinge 90, the outer rigid hinge branch chain 30 is connected with the load platform 40 through the hooke hinge 90, and is connected with the inner rigid hinge branch chain 20 through the hooke hinge 90 to form two UU parallel mechanisms connected in series, so that the load platform 40 can do quasi-planar linear motion near the mass axis through the inner rigid hinge branch chain 20 and the outer rigid hinge branch chain 30, the whole vibration isolator forms a single pendulum structure, the pendulum length of the vibration isolator is extended to the maximum extent, and the inherent frequency of the large-amplitude horizontal two-degree-of-freedom vibration isolator can be effectively reduced.
On the other hand, when the vibration isolation objects 81 with different qualities are corresponding to each other, the corresponding mass block 80 can be placed on the mass center adjusting platform 50, so that the position of the mass center shaft of the vibration isolator is kept unchanged, the vibration isolator is always in a quasi-zero rigidity balance position, and at the moment, the vibration isolator is close to a quasi-zero rigidity state, so that the purpose of adapting to the vibration isolation objects 81 with different qualities can be achieved through simple operation.
In several embodiments provided in the present disclosure, it will be apparent to those skilled in the art that the present disclosure is not limited to the details of the above-described exemplary embodiments, and can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the disclosure being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. The terms first, second, etc. are used to denote names, but not any particular order.
Although the present disclosure has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present disclosure.
Claims (10)
1. The utility model provides a big horizontal two degree of freedom isolator of amplitude which characterized in that includes:
a fixed platform;
the inner rigid hinged branch chain is connected to the fixed platform through a hook hinge;
the motion control platform is connected with the inner rigid hinge branched chain through a Hooke hinge;
the outer rigid hinge chain is hinged with the inner rigid hinge chain;
and the load platform is used for bearing vibration isolation objects and is connected with the outer rigid hinge branched chain through a Hooke hinge.
2. The high amplitude horizontal two degree of freedom vibration isolator of claim 1, wherein the top of the inner rigid hinge branch is connected to the outer rigid hinge branch by a ball pair or a hooke hinge.
3. The high-amplitude horizontal two-degree-of-freedom vibration isolator according to claim 2, wherein the number of the inner rigid hinge branches is at least three and is uniformly distributed along the circumferential direction of the fixed platform.
4. The high amplitude horizontal two degree of freedom vibration isolator of claim 3 wherein the internal rigid hinge arms are the same size, material and mass.
5. The large amplitude horizontal two degree of freedom vibration isolator of claim 4 wherein the load platform is located below the fixed platform and the bottom of the inner rigid hinge chain is connected to the fixed platform; the top of the outer rigid hinge branched chain is connected with the top of the inner rigid hinge branched chain through a spherical pair, and the bottom of the outer rigid hinge branched chain is connected with the load platform through a Hooke hinge.
6. The high amplitude horizontal two degree of freedom vibration isolator of claim 5 wherein the outer rigid hinge comprises a horizontal link and a vertical link, the horizontal link extending in a horizontal direction, one end connected to the inner rigid hinge by a ball pair and the other end connected to the top of the vertical link; the vertical connecting part extends along the vertical direction, and the bottom of the vertical connecting part is connected with the load platform through a hook hinge.
7. The high-amplitude horizontal two-degree-of-freedom vibration isolator according to claim 6, wherein the number of the outer rigid hinge chains is at least three and is uniformly distributed along the circumferential direction of the load platform.
8. The vibration isolator with large amplitude and horizontal degrees of freedom as claimed in claim 7, wherein the sizes, materials and qualities of the external rigid hinge chains are the same.
9. The high amplitude horizontal two degree of freedom vibration isolator of claim 8 further comprising a center of mass adjustment platform for carrying a mass above the motion control platform and connected to the top of the vertical connection of the outer rigid hinge arms by hooke hinges.
10. The high amplitude horizontal two degree of freedom vibration isolator of claim 9 further comprising a clamp, the clamp comprising:
the connecting rod is connected to the fixed platform;
a swing assembly including a connecting seat connected to the connecting rod, a cross member extending in a horizontal direction and rotatably connected to the connecting seat, and a longitudinal member extending in a horizontal direction and rotatably connected to the cross member;
and the fixed strut extends along the vertical direction, one end of the fixed strut is connected with the transverse piece, and the other end of the fixed strut is connected with the center-of-mass adjusting platform through a ball pair.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116164065A (en) * | 2023-02-24 | 2023-05-26 | 东莞理工学院 | Two-degree-of-freedom quasi-zero stiffness vibration isolator for polishing equipment |
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Cited By (2)
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| CN116164065A (en) * | 2023-02-24 | 2023-05-26 | 东莞理工学院 | Two-degree-of-freedom quasi-zero stiffness vibration isolator for polishing equipment |
| CN116164065B (en) * | 2023-02-24 | 2023-09-15 | 东莞理工学院 | Two-degree-of-freedom quasi-zero stiffness vibration isolator for polishing equipment |
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| CN114934974B (en) | 2023-10-20 |
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