CN111022545A - Cylinder type high static low dynamic low frequency passive vibration isolator - Google Patents
Cylinder type high static low dynamic low frequency passive vibration isolator Download PDFInfo
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- CN111022545A CN111022545A CN201911242597.XA CN201911242597A CN111022545A CN 111022545 A CN111022545 A CN 111022545A CN 201911242597 A CN201911242597 A CN 201911242597A CN 111022545 A CN111022545 A CN 111022545A
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- frequency
- roller
- supporting column
- belleville spring
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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
- F16F7/00—Vibration-dampers; Shock-absorbers
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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
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/104—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted
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- Mechanical Engineering (AREA)
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Abstract
A cylinder type high static low dynamic low frequency passive vibration isolator. The device comprises a negative-stiffness cylindrical drum, an objective table, a buckling beam ring sleeve, a cam, a guide plate, a bottom drum, a supporting column, a roller, a belleville spring and a connecting plate; the invention can make the rigidity of the whole device at the balance position approximately zero and the natural frequency as low as possible according to the principle that the positive and negative rigidities of the parallel elastic elements are offset, thereby realizing the vibration isolation of low-frequency or ultra-low-frequency vibration. The bearing mass is large, the dynamic stiffness of the whole device can be reduced, the occupied size is small, the vibration isolation capability is strong, and the vibration isolation device is very suitable for low-frequency or ultralow-frequency vibration isolation. The butterfly spring has small deformation displacement, large bearing capacity, small occupied space and difficult instability. Compared with the traditional linear spring, the buckling beam ring sleeve has good shock resistance, the buckling phenomenon of the linear spring in the compression process can be effectively avoided by matching the cam-roller mechanism, and the supporting column and the roller which are connected by the threads can not only facilitate the replacement of the cam, but also adjust the height of the roller by the threads.
Description
Technical Field
The invention belongs to the technical field of vibration isolation devices, and particularly relates to a cylindrical high-static low-dynamic low-frequency passive vibration isolator.
Background
The traditional linear passive vibration isolator has excellent vibration isolation effect in the fields of medium-frequency and high-frequency vibration, but along with the urgent need of high-precision instruments for low-frequency and ultra-low-frequency vibration isolation, the traditional linear vibration isolator cannot bear the isolation of low-frequency vibration due to the limitation of the inherent properties of the traditional linear vibration isolator. According to the linear vibration theory: when the external excitation (force or displacement) frequency is more than twice the root sign of the natural frequency of the vibration isolation system, the linear system can play a role of vibration isolation, so that the linear system needs to reduce the natural frequency of the linear system to isolate low-frequency or ultralow-frequency vibration, but the linear system cannot achieve the aim. In addition, most high-precision components have the characteristics of small volume and small vibration amplitude, so that the occupied space of the vibration isolation system is smaller, the occupied space is better, and the structure is simpler and more applicable. Most of the prior low-frequency passive vibration isolators have no obvious vibration isolation effect on low frequency or ultralow frequency small excitation displacement because of large volume, poor precision and large error.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a cylindrical high-static low-dynamic low-frequency passive vibration isolator.
In order to achieve the aim, the cylindrical high-static low-dynamic low-frequency passive vibration isolator provided by the invention comprises a negative-stiffness cylindrical drum, an objective table, a buckling beam ring sleeve, a cam, a guide plate, a bottom drum, a supporting column, a roller, a belleville spring and a connecting plate; wherein, a round hole is formed in the middle of the guide plate and is arranged at the upper port of the bottom barrel; the lower end of the supporting column is fixed in the middle of the bottom surface of the bottom barrel, and the upper part of the supporting column extends upwards from the round hole on the guide plate to the outside of the bottom barrel; the belleville spring is arranged at the outer side part of the bottom surface of the bottom barrel; the connecting plate is of an annular structure with a central hole, is horizontally arranged in the bottom barrel, and the bottom surface of the connecting plate is connected with the belleville spring; the lower part of the cylinder is downwards inserted into the bottom cylinder from the edge of the circular hole on the guide plate, the lower port is connected with the surface of the connecting plate, and the upper port is provided with an objective table; the roller is arranged on the upper part of the supporting column; the outside edge of buckling roof beam ring cover is fixed in the inner peripheral face middle part of negative rigidity cylinder, and a plurality of cams are installed to inboard edge interval distance, and a plurality of cams can contact with the surface of roller when static.
And the parts of the upper surface and the lower surface of the connecting plate, which are positioned at the edge of the central hole, are respectively provided with a positioning cone which can be inserted into the lower end of the negative-stiffness cylindrical barrel and the middle part of the belleville spring.
The upper part of the supporting column is provided with an external thread, and the central hole of the roller is internally provided with an internal thread.
The buckling beam ring sleeve is composed of four cosine beams which are connected end to end and are symmetrically arranged.
The belleville spring is an equal-thickness belleville spring.
The cylindrical high-static low-dynamic low-frequency passive vibration isolator provided by the invention can enable the rigidity of the whole device at the balance position to be approximately zero and the natural frequency to be as low as possible according to the principle that the positive rigidity and the negative rigidity of the elastic elements connected in parallel are offset, thereby realizing the vibration isolation of low-frequency or ultralow-frequency vibration. The bearing mass is large, the dynamic stiffness of the whole device can be reduced, the occupied size is small, the vibration isolation capability is strong, and the vibration isolation device is very suitable for isolating low-frequency or ultralow-frequency vibration. The butterfly spring has small deformation displacement, large bearing capacity, small occupied space and difficult instability. Compared with the traditional linear spring, the buckling beam ring sleeve has good shock resistance, the buckling phenomenon in the compression process of the linear spring can be effectively avoided by matching the cam-roller mechanism, and the supporting column and the roller which are connected by the threads can not only facilitate the replacement of the cam, but also adjust the height of the roller by the threads.
Drawings
Fig. 1 is a front sectional view of a cylindrical high static low dynamic low frequency passive vibration isolator provided by the invention.
Fig. 2 is a front view of the cylindrical high static low dynamic low frequency passive vibration isolator provided by the invention.
Fig. 3 is a top view of the cylindrical high static low dynamic low frequency passive vibration isolator provided by the invention.
Fig. 4 is a schematic structural diagram of an outer cylinder with negative stiffness in the cylindrical high static low dynamic low frequency passive vibration isolator provided by the invention.
Detailed Description
For the understanding of the present invention, the present invention will be described in more detail with reference to the following examples, which are merely illustrative and not intended to limit the scope of the present invention.
As shown in fig. 1-4, the cylindrical high-static low-dynamic low-frequency passive vibration isolator provided by the invention comprises a negative-stiffness cylindrical barrel 1, an objective table 2, a buckling beam circular sleeve 3, a cam 4, a guide plate 5, a bottom barrel 6, a supporting column 7, a roller 8, a belleville spring 9 and a connecting plate 10; wherein, a round hole is formed in the middle of the guide plate 5 and is arranged at the upper port of the bottom barrel 6; the lower end of the supporting column 7 is fixed in the middle of the bottom surface of the bottom barrel 6, and the upper part of the supporting column extends upwards from the round hole on the guide plate 5 to the outside of the bottom barrel 6; the belleville spring 9 is arranged at the outer side part of the bottom surface of the bottom barrel 6; the connecting plate 10 is an annular structure with a central hole, is horizontally arranged inside the bottom barrel 6, and the bottom surface of the connecting plate is connected with the belleville spring 9; the lower part of the cylinder 1 is inserted into the bottom cylinder 6 from the edge of the circular hole on the guide plate 5, the lower port is connected with the surface of the connecting plate 10, and the upper port is provided with the objective table 2; the roller 8 is arranged on the upper part of the supporting column 7; the outer edge of the buckling beam circular ring sleeve 3 is fixed in the middle of the inner circumferential surface of the negative-rigidity cylindrical barrel 1, a plurality of cams 4 are mounted at the inner edge at intervals, and the plurality of cams 4 can be in contact with the outer surface of the roller 8 when the roller is static.
The upper surface and the lower surface of the connecting plate 10, which are positioned at the edge of the central hole, are respectively provided with a positioning cone which can be inserted into the lower end of the negative-stiffness cylindrical barrel 1 and the middle part of the belleville spring 9, and the relative positions of the belleville spring 9 and the negative-stiffness cylindrical barrel 1 can be kept unchanged through the positioning cones.
The upper part of the supporting column 7 is provided with an external thread, the central hole of the roller 8 is internally provided with an internal thread, and the position of the roller 8 on the supporting column 7 can be adjusted by utilizing the matching of the internal thread and the external thread.
The buckling beam ring sleeve 3 is composed of four cosine beams which are connected end to end and are symmetrically arranged.
The belleville spring 9 is a belleville spring with equal thickness.
The working principle of the cylindrical high-static low-dynamic low-frequency passive vibration isolator provided by the invention is explained as follows: firstly, a vibration-isolated object with a certain mass is fixedly arranged on the surface of the object stage 2. When the device is static, the negative rigidity part of the device shows that the centers of the cam 4 and the roller 8 are positioned on the same horizontal plane, and the buckling beam circular ring sleeve 3 is in a horizontal compression state. The positive stiffness portion is represented by the belleville spring 9 being compressed somewhat vertically to a state where it is zero in stiffness offset with the negative stiffness portion. When the device is excited by vertical force or displacement, the negative-rigidity cylindrical barrel 1 bearing the vibration-isolated object, the objective table 2, the buckling beam circular sleeve 3, the cam 4 and the connecting plate 10 move up and down together. The bending beam ring sleeve 3 is pressed up and down to generate elastic force, and meanwhile, the belleville spring 9 moves up and down under the vertical force of the negative stiffness part transmitted by the connecting plate 10, so that the vibration isolation of low-frequency or ultralow-frequency vibration is realized.
Claims (5)
1. The utility model provides a passive isolator of low frequency of high quiet low dynamic of cylinder which characterized in that: the cylinder type high-static low-dynamic low-frequency passive vibration isolator comprises a negative-stiffness cylinder (1), an objective table (2), a buckling beam ring sleeve (3), a cam (4), a guide plate (5), a bottom cylinder (6), a supporting column (7), a roller (8), a belleville spring (9) and a connecting plate (10); wherein, a round hole is formed in the middle of the guide plate (5) and is arranged at the upper port of the bottom barrel (6); the lower end of the supporting column (7) is fixed in the middle of the bottom surface of the bottom barrel (6), and the upper part of the supporting column extends upwards from the round hole on the guide plate (5) to the outside of the bottom barrel (6); the belleville spring (9) is arranged at the outer side part of the bottom surface of the bottom barrel (6); the connecting plate (10) is of an annular structure with a central hole, is horizontally arranged inside the bottom barrel (6), and the bottom surface of the connecting plate is connected with the belleville spring (9); the lower part of the cylindrical barrel (1) is downwards inserted into the bottom barrel (6) from the edge of a circular hole on the guide plate (5), the lower port is connected with the surface of the connecting plate (10), and the upper port is provided with an objective table (2); the roller (8) is arranged on the upper part of the supporting column (7); the outer edge of the buckling beam ring sleeve (3) is fixed in the middle of the inner circumferential surface of the negative-rigidity cylindrical barrel (1), a plurality of cams (4) are mounted at the inner edge at intervals, and the cams (4) can be in contact with the outer surface of the roller (8) when the buckling beam ring sleeve is static.
2. The passive isolator of claim 1, wherein: the upper surface and the lower surface of the connecting plate (10) are respectively provided with a positioning cone which can be inserted into the lower end of the negative stiffness cylindrical barrel (1) and the middle part of the belleville spring (9).
3. The passive isolator of claim 1, wherein: the upper part of the supporting column (7) is provided with an external thread, and the central hole of the roller (8) is internally provided with an internal thread.
4. The passive isolator of claim 1, wherein: the buckling beam ring sleeve (3) is composed of four cosine beams which are connected end to end and are symmetrically arranged.
5. The passive isolator of claim 1, wherein: the belleville spring (9) is an equal-thickness belleville spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911242597.XA CN111022545B (en) | 2019-12-06 | 2019-12-06 | Cylinder type high static low dynamic low frequency passive vibration isolator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911242597.XA CN111022545B (en) | 2019-12-06 | 2019-12-06 | Cylinder type high static low dynamic low frequency passive vibration isolator |
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| CN111022545A true CN111022545A (en) | 2020-04-17 |
| CN111022545B CN111022545B (en) | 2021-08-13 |
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| CN201911242597.XA Active CN111022545B (en) | 2019-12-06 | 2019-12-06 | Cylinder type high static low dynamic low frequency passive vibration isolator |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2736176A1 (en) * | 1977-08-11 | 1979-02-22 | Weltin Optac | Plasticised, filled, PVC sheet - used for reducing boom or drone made by machinery, has adjustable suction cups for fixing e.g. to machine casing |
| CN103821863A (en) * | 2014-03-09 | 2014-05-28 | 北京工业大学 | Adjustable swinging type multi-dimensional low-frequency damping device for cultural relics |
| CN203641365U (en) * | 2014-01-07 | 2014-06-11 | 湖南大学 | Quasi zero stiffness vibration isolator |
| CN207315951U (en) * | 2017-08-08 | 2018-05-04 | 扬州中碟弹簧制造有限公司 | A kind of buffering spring component |
| CN208730829U (en) * | 2018-08-21 | 2019-04-12 | 华南农业大学 | A kind of non-linear seat suspension and driver seat |
| CN109973571A (en) * | 2017-12-28 | 2019-07-05 | 北京市劳动保护科学研究所 | A kind of quasi-zero stiffness vibration isolators with horizontal damping |
-
2019
- 2019-12-06 CN CN201911242597.XA patent/CN111022545B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2736176A1 (en) * | 1977-08-11 | 1979-02-22 | Weltin Optac | Plasticised, filled, PVC sheet - used for reducing boom or drone made by machinery, has adjustable suction cups for fixing e.g. to machine casing |
| CN203641365U (en) * | 2014-01-07 | 2014-06-11 | 湖南大学 | Quasi zero stiffness vibration isolator |
| CN103821863A (en) * | 2014-03-09 | 2014-05-28 | 北京工业大学 | Adjustable swinging type multi-dimensional low-frequency damping device for cultural relics |
| CN207315951U (en) * | 2017-08-08 | 2018-05-04 | 扬州中碟弹簧制造有限公司 | A kind of buffering spring component |
| CN109973571A (en) * | 2017-12-28 | 2019-07-05 | 北京市劳动保护科学研究所 | A kind of quasi-zero stiffness vibration isolators with horizontal damping |
| CN208730829U (en) * | 2018-08-21 | 2019-04-12 | 华南农业大学 | A kind of non-linear seat suspension and driver seat |
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| CN111022545B (en) | 2021-08-13 |
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