CN112576689A - Low-frequency heavy-load quasi-zero stiffness vibration isolation device - Google Patents
Low-frequency heavy-load quasi-zero stiffness vibration isolation device Download PDFInfo
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- CN112576689A CN112576689A CN202011401369.5A CN202011401369A CN112576689A CN 112576689 A CN112576689 A CN 112576689A CN 202011401369 A CN202011401369 A CN 202011401369A CN 112576689 A CN112576689 A CN 112576689A
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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
- F16F15/06—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 with metal springs
- F16F15/067—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 with metal springs using only wound springs
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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
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
- F16F2228/06—Stiffness
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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
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
- F16F2228/06—Stiffness
- F16F2228/066—Variable stiffness
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- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a low-frequency heavy-load quasi-zero stiffness vibration isolation device, belongs to the technical field of mechanical vibration and noise control, and aims to solve the problem that the existing quasi-zero stiffness vibration isolator is still relatively limited in bearing capacity and cannot meet the vibration isolation requirement under the condition of large-scale mechanical equipment. The guide mechanism is arranged in the main frame, the supporting part of the guide mechanism is fixedly connected with the inner wall of the main frame, the supporting platform is arranged at the top of the guide mechanism and is hinged with the moving part of the guide mechanism, the supporting platform can reciprocate in the main frame along the vertical direction through the guide mechanism, the two vibration isolation units are oppositely arranged at two sides of the guide mechanism, the fixing part of each vibration isolation unit is fixedly connected with the inner wall of the main frame, the supporting part of each vibration isolation unit is hinged with the supporting platform, and the adjusting part of each vibration isolation unit is hinged with the guide mechanism.
Description
Technical Field
The invention belongs to the technical field of mechanical vibration and noise control, and particularly relates to a low-frequency heavy-load quasi-zero stiffness vibration isolation device.
Background
The bearing capacity of the traditional linear passive vibration isolator is sharply reduced when low-frequency vibration isolation is carried out, the quasi-zero stiffness vibration isolator with the nonlinear characteristic is one of effective means for breaking through the bottleneck, and the quasi-zero stiffness vibration isolator has the characteristics of lower dynamic stiffness and higher static stiffness, has zero or quasi-zero dynamic stiffness at a static balance position, can effectively block the low-frequency vibration of a vibration source, and has the bearing performance superior to that of the linear vibration isolator. However, the bearing capacity of the existing quasi-zero stiffness vibration isolator is still relatively limited, and the vibration isolation requirement of mechanical equipment under a large-scale condition cannot be met, so that the shortage seriously hinders the popularization and application of the vibration isolator in modern engineering.
Disclosure of Invention
The invention provides a low-frequency heavy-load quasi-zero stiffness vibration isolation device, aiming at solving the problems that the bearing capacity of the existing quasi-zero stiffness vibration isolator is still relatively limited and the vibration isolation requirement under the condition of large-scale mechanical equipment cannot be met;
a low-frequency heavy-load quasi-zero stiffness vibration isolation device comprises a main frame, a supporting platform, a guide mechanism and two vibration isolation units;
the vibration isolation device comprises a main frame, a guide mechanism, a supporting part, a supporting platform, two vibration isolation units, a supporting platform and a regulating part, wherein the guide mechanism is arranged in the main frame, the supporting part of the guide mechanism is fixedly connected with the inner wall of the main frame, the supporting platform is arranged at the top of the guide mechanism and is fixedly connected with the moving part of the guide mechanism, the supporting platform can reciprocate in the main frame along the vertical direction through the guide mechanism, the two vibration isolation units are oppositely arranged at two sides of the guide mechanism, the fixing part of each vibration isolation unit is fixedly connected with the inner wall of the main frame, the supporting part of each vibration isolation unit is;
further, the guide mechanism comprises a sliding block, a linear bearing, a supporting beam and a connecting shaft;
the top end of the connecting shaft is fixedly connected with the bottom surface of the supporting platform, the sliding block is arranged below the supporting platform, the sliding block is sleeved on the connecting shaft and is in sliding connection with the connecting shaft, the two ends of the supporting beam are respectively and fixedly connected to the inner walls of the corresponding main frames, a through hole is formed in the middle of the supporting beam, the tail end of the connecting shaft penetrates through the through hole in the supporting beam and is arranged below the supporting beam, a linear bearing is arranged between the connecting shaft and the supporting beam, the connecting shaft is in sliding connection with the supporting beam through the linear bearing, and the adjusting part of each vibration isolation;
furthermore, a connecting cylinder is arranged on the outer side of the sliding block, one end of the connecting cylinder is fixedly connected with the outer side of the sliding block, and the adjusting part of each vibration isolation unit is hinged with the connecting cylinder on the outer side of the sliding block;
further, the vibration isolation unit comprises a pressing arch rod, a linear spring and a fixed seat;
the fixing seat is fixedly connected to the inner wall of the main frame, one end of the pressing arch rod is hinged to the fixing seat, the other end of the pressing arch rod is hinged to the bottom of the supporting platform, the linear spring is arranged below the pressing arch rod, one end of the linear spring is hinged to the fixing seat, and the other end of the linear spring is hinged to the sliding block;
furthermore, an annular caulking groove is processed on the outer circular surface of the connecting cylinder outside the sliding block, the other end of the linear spring is sleeved in the annular caulking groove on the connecting cylinder, and the other end of the linear spring can rotate along the circumferential direction of the connecting cylinder;
further, the swing range of the arch pressing rod is 0-30 degrees;
furthermore, the axis of the connecting shaft, the axis of the supporting platform and the axis of the through hole in the middle of the supporting beam are arranged in a collinear manner;
compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a low-frequency heavy-load quasi-zero stiffness vibration isolation device, which is characterized in that a quasi-zero stiffness vibration isolator is designed by utilizing the integral instability of a pressure arch structure, the vibration acting on a support platform in the vertical direction is greatly attenuated when being transmitted to the bottom of a main frame, and the bearing capacity of the vibration isolation device is not less than 2000kg under the condition that the dynamic stiffness is kept quasi-zero.
2. The invention provides a low-frequency heavy-load quasi-zero stiffness vibration isolation device which can keep the dynamic stiffness to be quasi-zero at least within a vertical displacement stroke of 25mm under a rated load condition, thereby ensuring that the low-frequency heavy-load quasi-zero stiffness vibration isolation device has higher load capacity and can stably and effectively isolate low-frequency vibration.
3. The invention provides a low-frequency heavy-load quasi-zero stiffness vibration isolation device, which is capable of adjusting the bearing capacity of the vibration isolation device by designing the compression arch rods with different structural sizes and arrangement angles so as to meet the vibration isolation requirements of vibration sources with different weights.
4. The invention provides a low-frequency heavy-load quasi-zero stiffness vibration isolation device, which is characterized in that linear springs with different stiffness are designed, so that the vertical displacement range of the vibration isolation device for keeping the quasi-zero stiffness can be adjusted, and the system stability under different amplitude conditions can be ensured.
5. The invention provides a low-frequency heavy-load quasi-zero stiffness vibration isolation device, provides a new thought for the development of a heavy-load quasi-zero stiffness vibration isolation device with stable and effective performance, provides effective technical support for the popularization and application of novel high-precision equipment, and has important theoretical and practical significance.
Drawings
FIG. 1 is a schematic view of the present invention (when no weight is placed);
FIG. 2 is a schematic structural view of the present invention (after placement of a weight);
FIG. 3 is a table displacement-external load curve of the present invention in operation.
The figure comprises a main frame 1, a supporting platform 2, a pressing arch rod 3, a linear spring 4, a sliding block 5, a linear bearing 6, a vibration source simulation counterweight 7, a supporting beam 8, a connecting shaft 9 and a fixing seat 10.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 2, and provides a low-frequency heavy-load quasi-zero stiffness vibration isolation device, which includes a main frame 1, a support platform 2, a guide mechanism, and two vibration isolation units;
the utility model discloses a vibration isolation device, including guiding mechanism, supporting platform 2, two vibration isolation units, guiding mechanism, supporting platform 2, two vibration isolation units, and the fixed part of every vibration isolation unit and the inner wall fixed connection of main frame 1, the supporting part of every vibration isolation unit is articulated with supporting platform 2, the regulating part of every vibration isolation unit is articulated with guiding mechanism, guiding mechanism's top is set up to supporting platform 2, and supporting platform 2 and guiding mechanism's removal portion fixed connection, supporting platform 2 accessible guiding mechanism carries out reciprocating motion in main frame 1 along vertical direction, two vibration isolation units set up the both sides at guiding mechanism relatively, and the fixed part of every vibration.
The embodiment provides a low-frequency heavy-load quasi-zero stiffness vibration isolation device, which is characterized in that a quasi-zero stiffness vibration isolator is designed by utilizing the integral instability of a pressure arch structure, so that the vibration acting on a support platform in the vertical direction is greatly attenuated when being transmitted to the bottom of a main frame, and the bearing capacity of the vibration isolation device is not less than 2000kg under the condition that the dynamic stiffness is kept quasi-zero;
the vibration isolation device designed by the invention can keep the dynamic stiffness at least within a vertical displacement stroke of 25mm as quasi-zero under a rated bearing condition, thereby ensuring that the vibration isolation device has higher bearing capacity and can stably and effectively block low-frequency vibration;
the invention provides a new thought for the development of a heavy-load quasi-zero-stiffness vibration isolation device with stable and effective performance, and provides effective technical support for the popularization and application of novel high-precision equipment, thereby having important theoretical and practical significance.
The second embodiment is as follows: the present embodiment is described with reference to fig. 1 to 2, and is further limited to the guide mechanism described in the first embodiment, and in the present embodiment, the guide mechanism includes a slide block 5, a linear bearing 6, a support beam 8, and a connecting shaft 9;
the top of connecting axle 9 and supporting platform 2's bottom surface fixed connection, sliding block 5 sets up the below at supporting platform 2, sliding block 5 cover is established on connecting axle 9, and sliding block 5 and connecting axle 9 sliding connection, the both ends of a supporting beam 8 rigid coupling respectively is on 1 inner wall of main frame that corresponds, supporting beam 8's middle part processing has the through-hole, the end of connecting axle 9 passes the through-hole on a supporting beam 8 and sets up in a supporting beam 8 below, and be equipped with linear bearing 6 between connecting axle 9 and a supporting beam 8, connecting axle 9 passes through linear bearing 6 and a supporting beam 8 sliding connection, the regulating part of every vibration isolation unit is articulated with sliding block 5. Other components and connection modes are the same as those of the first embodiment.
In this embodiment, the sliding block 5 is supported by the adjusting part of the vibration isolation unit, so that the structural negative stiffness of the supporting platform 2 under the condition of bearing the vibration source is ensured to be subjected to nonlinear compensation, the stability of the supporting platform is ensured, the linear bearing 6 plays a certain guiding role in the connecting shaft 9, the connecting shaft 9 is ensured to reciprocate along the axial direction of the through hole in the supporting beam 8 in the vertical direction, and the connecting shaft 9 is ensured to move fluently.
The third concrete implementation mode: the present embodiment will be described with reference to fig. 1 to 2, and the present embodiment is further limited to the sliding block 5 described in the second embodiment, in the present embodiment, a connecting cylinder is provided on the outer side of the sliding block 5, one end of the connecting cylinder is fixedly connected to the outer side of the sliding block 5, and the adjusting portion of each vibration isolating unit is hinged to the connecting cylinder on the outer side of the sliding block 5. The other components and the connection mode are the same as those of the second embodiment.
In this embodiment, the connecting cylinders are arranged to ensure that the connecting points of the adjusting parts and the sliding blocks 5 in the two vibration isolation units can rotate relatively, so that the smoothness of nonlinear compensation of the negative structural rigidity of the supporting platform 2 in a bearing state is ensured, and the stability of the supporting platform 2 bearing a heavy object is indirectly ensured.
The fourth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 2, and is further limited to the vibration isolation unit according to the third embodiment, which includes a compression arch bar 3, a linear spring 4, and a fixing base 10;
In the embodiment, the support platform 2 is supported by the compression arch rod 3, the bearing capacity of the structure is improved by using the instability critical load of the compression arch, the nonlinear stiffness presented by the linear spring combination in the deformation process along the vertical direction provides nonlinear compensation for the negative stiffness presented by the support platform 2 caused by the integral instability of the compression arch structure due to the pressure exerted by the vibration source, and compared with the existing linear stiffness, the nonlinear stiffness compensation provided by the structure is increased along with the increase of the negative stiffness of the support platform 2, so that the achievable stiffness compensation fitting degree is higher.
The fifth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 2, and the present embodiment further defines the sliding block 5 in the fourth embodiment, in the present embodiment, an annular caulking groove is formed on the outer circumferential surface of the connecting cylinder outside the sliding block 5, the other end of the linear spring 4 is sleeved in the annular caulking groove on the connecting cylinder, and the other end of the linear spring 4 can rotate along the circumferential direction of the connecting cylinder. The other components and the connection mode are the same as those of the fourth embodiment.
So set up, be convenient for linear spring 4 and sliding block 5 be connected, linear spring 4 suit also can improve the stability that linear spring 4 and sliding block 5 are connected in the annular caulking groove in sliding block 5, is convenient for replace linear spring 4 simultaneously.
The sixth specific implementation mode: the present embodiment is described with reference to fig. 1 to 2, and the present embodiment further defines the arch bar pressing member 3 according to the fifth embodiment, and in the present embodiment, the swing range of the arch bar pressing member 3 is 0 ° to 30 °. The other components and the connection mode are the same as the fifth embodiment mode.
The seventh embodiment: the present embodiment is described with reference to fig. 1 to 2, and further defines the connecting shaft 9, the supporting platform 2 and the supporting beam 8 according to the sixth embodiment, and in the present embodiment, the axis of the connecting shaft 9, the axis of the supporting platform 2 and the axis of the through hole in the middle of the supporting beam 8 are arranged in a collinear manner. Other components and connection modes are the same as those of the sixth embodiment.
So set up, guaranteed the harmony of being connected between connecting axle 9, supporting platform 2 and a supporting beam 8.
Principle of operation
When the vibration source simulation device is used, the components are assembled according to the connection mode in the first embodiment to the seventh embodiment, and the vibration source simulation counterweight 7 is arranged on the supporting platform 2. Under the pressure of the vibration source simulation counterweight 7, the supporting platform 2 is contacted with the top surface of the sliding block 5 along with the sliding of the connecting shaft 9 relative to the supporting beam 8 through the linear bearing 6 due to the integral instability of the compression arch structure and moves downwards to a balance position together, and the equivalent stiffness of the system corresponding to the position in the vertical direction is quasi-zero. Thereby ensuring that the device can obtain high bearing capacity which is comparable with the integral instability critical load of the compression arch and is not less than 2000 kg. At the same time, the quasi-zero system equivalent stiffness will make the vibration isolation device have extremely low natural frequency. Therefore, if the vibration source simulation counterweight 7 is excited by the excitation equipment, an extremely low initial vibration isolation frequency is obtained, and the vibration of the supporting platform along the vertical direction is greatly attenuated from the extremely low frequency when being transmitted to the bottom of the main frame, so that the low-frequency vibration isolation under the heavy load condition is realized.
The invention can also realize the adjustment of the bearing capacity of the vibration isolation device by designing the pressing arch rod pieces 3 with different structural sizes and arrangement angles. The linear springs 4 with different rigidity are designed, and the vertical displacement range of the vibration isolation device for keeping the quasi-zero rigidity can be adjusted.
The low-frequency heavy-load quasi-zero stiffness vibration isolation device designed by the invention is easy to disassemble, convenient to maintain and strong in designability. The materials of all structural parts of the invention are common engineering materials, thus being economical and feasible.
Claims (7)
1. A low-frequency heavy-load quasi-zero stiffness vibration isolation device is characterized in that; the vibration isolation device comprises a main frame (1), a supporting platform (2), a guide mechanism and two vibration isolation units;
the utility model discloses a vibration isolation device, including guiding mechanism, supporting platform (2) and guiding mechanism, guiding mechanism sets up in main frame (1), guiding mechanism's supporting part and the inner wall fixed connection of main frame (1), supporting platform (2) setting is at guiding mechanism's top, and supporting platform (2) and guiding mechanism's removal portion fixed connection, supporting platform (2) accessible guiding mechanism carries out reciprocating motion along vertical direction in main frame (1), two vibration isolation units set up the both sides at guiding mechanism relatively, and the fixed part of every vibration isolation unit and the inner wall fixed connection of main frame (1), the supporting part of every vibration isolation unit is articulated with supporting platform (2), the regulation part of every vibration isolation unit is articulated with guiding mechanism.
2. A low frequency heavy duty quasi-zero stiffness vibration isolation mounting according to claim 1, wherein: the guide mechanism comprises a sliding block (5), a linear bearing (6), a supporting beam (8) and a connecting shaft (9);
the top of connecting axle (9) and the bottom surface fixed connection of supporting platform (2), sliding block (5) set up the below in supporting platform (2), sliding block (5) cover is established on connecting axle (9), and sliding block (5) and connecting axle (9) sliding connection, the both ends of a supporting beam (8) rigid coupling is respectively on main frame (1) inner wall that corresponds, the middle part processing of a supporting beam (8) has the through-hole, the end of connecting axle (9) passes the through-hole on a supporting beam (8) and sets up in a supporting beam (8) below, and be equipped with linear bearing (6) between connecting axle (9) and a supporting beam (8), connecting axle (9) are through linear bearing (6) and a supporting beam (8) sliding connection, the regulating part of every vibration isolation unit is articulated with sliding block (5).
3. A low frequency heavy duty quasi-zero stiffness vibration isolation mounting according to claim 2, wherein: the outside of sliding block (5) is equipped with the connection cylinder, connects cylindrical one end and the outside fixed connection of sliding block (5), and the regulating part of every vibration isolation unit is articulated with the connection cylinder in sliding block (5) outside.
4. A low frequency heavy duty quasi-zero stiffness vibration isolation device as claimed in claim 2 or 3, wherein: the vibration isolation unit comprises a compression arch rod (3), a linear spring (4) and a fixed seat (10);
the fixing seat (10) is fixedly connected to the inner wall of the main frame (1), one end of the pressing arch rod piece (3) is hinged to the fixing seat (10), the other end of the pressing arch rod piece (3) is hinged to the bottom of the supporting platform (2), the linear spring (4) is arranged below the pressing arch rod piece (3), one end of the linear spring (4) is hinged to the fixing seat (10), and the other end of the linear spring (4) is hinged to the sliding block (5).
5. The low frequency heavy duty quasi-zero stiffness vibration isolation device of claim 4, wherein: an annular caulking groove is processed on the outer circular surface of the connecting cylinder on the outer side of the sliding block (5), the other end of the linear spring (4) is sleeved in the annular caulking groove on the connecting cylinder, and the other end of the linear spring (4) can rotate along the circumferential direction of the connecting cylinder.
6. A low frequency heavy duty quasi-zero stiffness vibration isolation device as claimed in claim 5, wherein: the swing range of the pressing arch rod (3) is 0-30 degrees.
7. A low frequency heavy duty quasi-zero stiffness vibration isolation device as claimed in claim 6, wherein: the axis of the connecting shaft (9), the axis of the supporting platform (2) and the axis of the through hole in the middle of the supporting beam (8) are arranged in a collinear manner.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323979A (en) * | 2021-06-18 | 2021-08-31 | 哈尔滨工程大学 | Quasi-zero stiffness vibration isolator with unstability simply supported beam as positive stiffness bearing element |
| CN113357308A (en) * | 2021-07-14 | 2021-09-07 | 吉林大学 | High-efficient low frequency vibration isolation device |
| CN114278703A (en) * | 2021-12-30 | 2022-04-05 | 哈尔滨工程大学 | Low-frequency quasi-zero stiffness vibration isolator integrated with double-geometric nonlinear structure |
| CN114321260A (en) * | 2022-01-20 | 2022-04-12 | 中国矿业大学 | Electro-active quasi-zero stiffness vibration isolator |
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| CN113323979A (en) * | 2021-06-18 | 2021-08-31 | 哈尔滨工程大学 | Quasi-zero stiffness vibration isolator with unstability simply supported beam as positive stiffness bearing element |
| CN113323979B (en) * | 2021-06-18 | 2022-04-29 | 哈尔滨工程大学 | Quasi-zero stiffness vibration isolator with unstability simply supported beam as positive stiffness bearing element |
| CN113357308A (en) * | 2021-07-14 | 2021-09-07 | 吉林大学 | High-efficient low frequency vibration isolation device |
| CN113357308B (en) * | 2021-07-14 | 2022-08-16 | 吉林大学 | High-efficient low frequency vibration isolation device |
| CN114278703A (en) * | 2021-12-30 | 2022-04-05 | 哈尔滨工程大学 | Low-frequency quasi-zero stiffness vibration isolator integrated with double-geometric nonlinear structure |
| CN114278703B (en) * | 2021-12-30 | 2024-03-15 | 哈尔滨工程大学 | Low-frequency quasi-zero stiffness vibration isolator integrated by double-geometric nonlinear structure |
| CN114321260A (en) * | 2022-01-20 | 2022-04-12 | 中国矿业大学 | Electro-active quasi-zero stiffness vibration isolator |
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