CN109736446B - Vertical vibration isolation/shock support with variable rigidity - Google Patents
Vertical vibration isolation/shock support with variable rigidity Download PDFInfo
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- CN109736446B CN109736446B CN201910005710.6A CN201910005710A CN109736446B CN 109736446 B CN109736446 B CN 109736446B CN 201910005710 A CN201910005710 A CN 201910005710A CN 109736446 B CN109736446 B CN 109736446B
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Abstract
The invention discloses a variable-rigidity vertical vibration isolation/shock support which is characterized in that: a pre-pressing spring is arranged between the first horizontal plate and the second horizontal plate, a prestressed tendon is also arranged between the first horizontal plate and the second horizontal plate, and 2 anchorage devices of the prestressed tendon are respectively anchored on the upper side of the first horizontal plate and the lower side of the second horizontal plate; the pre-pressing spring is in a pre-pressing state by stretching and anchoring the pre-stressed tendons; a third horizontal plate is arranged below the second horizontal plate, and a second spring is connected between the second horizontal plate and the third horizontal plate; a spring stiffness adjusting device is arranged between the first horizontal plate and the third horizontal plate; the spring rate adjusting device includes: the side part of the pressure lever is provided with a protruding part which is arranged in the adjusting cavity; under the action of a static vertical load G, the second spring provides support stiffness, and the design requirement G is less than the pretension force F of the prestressed tendon, and the pretension force F is in an initial state; under initial condition, the bottom of depression bar and the distance that adjusts the cavity and leave is more than or equal to: (F-G)/K2.
Description
Technical Field
The invention relates to the fields of buildings, walls, disaster prevention and reduction and the like, in particular to a variable-rigidity vertical vibration isolation/reduction support.
Background
The invention text of Yan Weiming professor of Beijing university of industry is: CN100478539A, a vertical vibration isolation/shake support of variable rigidity variable damping is proposed, belongs to the structural vibration control field. The damping device comprises an upper connecting plate, a lower connecting plate, a pre-pressing spring with smaller vertical stiffness, a variable stiffness compensation spring with larger vertical stiffness, a small oil damper arranged in the pre-pressing spring and a large oil damper arranged in the compensation spring. The variable-stiffness compensation spring is positioned in the center of the lower connecting plate, the upper end of the variable-stiffness compensation spring penetrates into the first preformed hole of the first compensation support to enable the upper end of the compensation spring to be in an unconstrained state, the pre-compression springs are distributed around the variable-stiffness compensation spring, and a plurality of second compensation supports are fixed on the bottom surface of the upper connecting plate. The bottom ends of the large oil damper and the small oil damper are fixed with the lower connecting plate, and the upper ends of the large oil damper and the small oil damper are restrained by the second compensation support.
The working process of CN100478539A is as follows: under the normal working state, the vertical support is in an undamped elastic working state, the upper load is completely borne by the pre-pressing spring, and the rigidity of the pre-pressing spring of the vertical support is small, so that high-frequency micro vibration can be isolated; when an earthquake occurs, the compensation spring starts to work, the vertical tensile strength and the tensile rigidity of the vibration isolation support are increased, and the danger of large vertical deformation is avoided.
CN100478539A provides a technical idea of variable stiffness vibration isolation, which mainly realizes the concept of variable stiffness by pre-pressing a spring and compensating the spring.
From the above documents, it is known that vertical vibration isolation with variable stiffness is one of the design ideas of the vertical vibration isolation mount of the present day. However, the above document is complicated in arrangement.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a variable-rigidity vertical vibration isolation/vibration support which can simplify the structure of the vibration isolation/vibration support.
The scheme of the application is as follows:
a variable stiffness vertical vibration isolation/dampening mount comprising: a first horizontal plate and a second horizontal plate; a pre-pressing spring is arranged between the first horizontal plate and the second horizontal plate, a prestressed tendon is also arranged between the first horizontal plate and the second horizontal plate, and 2 anchorage devices of the prestressed tendon are respectively anchored on the upper side of the first horizontal plate and the lower side of the second horizontal plate; the pre-pressing spring is in a pre-pressing state by stretching and anchoring the pre-stressed tendons;
a third horizontal plate is arranged below the second horizontal plate, and a second spring is connected between the second horizontal plate and the third horizontal plate; a spring stiffness adjusting device is arranged between the first horizontal plate and the third horizontal plate;
the spring rate adjusting device includes: the pressure lever is arranged below the first horizontal plate, the sleeve is arranged above the third horizontal plate, the third spring and the adjusting cavity are arranged on the third horizontal plate;
one end of the third spring is connected with the lower part of the adjusting cavity, and the other end of the third spring is connected with the upper part of the third horizontal plate; the pressure lever enters the adjusting cavity, and the bottom of the pressure lever is away from the adjusting cavity; the side part of the pressure lever is provided with a protruding part which is arranged in the adjusting cavity;
the adjusting cavity is arranged in the sleeve;
under the action of a static vertical load G, the second spring provides support stiffness, and the design requirement G is less than the pretension force F of the prestressed tendon, and the pretension force F is in an initial state;
under initial condition, the bottom of depression bar and the distance that adjusts the cavity and leave is more than or equal to: (F-G)/K2.
Further, in the initial state, the protruding part is in contact with the upper surface of the adjustment cavity; the depression bar is installed under initial condition, and the depression bar passes first horizontal plate, is provided with the screw thread at the surface of depression bar, is provided with 2 screw caps on the upper portion of depression bar, and 2 screw caps are located first horizontal plate 1's higher authority respectively and below, and the back is good in the altitude mixture control of depression bar, then through pressing from both sides the depression bar tight at first horizontal plate with 2 screw caps, and then fixed depression bar.
Further, a stopper is provided on the inner surface of the sleeve, and in an initial state, a distance between the lower surface of the second horizontal plate and the stopper is (F-G)/K2.
Further, the sleeve comprises an inner wall and an outer wall, the cross sections of the inner wall and the outer wall are closed circles or rectangles, the size of the inner wall is larger than the range of the second horizontal plate, and the adjusting cavity is arranged between the inner wall and the outer wall; a plurality of cells are uniformly distributed in the sleeve, and the adjusting cavity and the third spring are arranged in the cells.
Further, a viscous damper is installed between the first horizontal plate and the third horizontal plate, and the viscous damper is arranged on the outer side of the outer wall of the sleeve.
Furthermore, viscous liquid is filled between the inner wall of the sleeve and the third horizontal plate, and a piston rod is arranged below the first horizontal plate; and a piston rod is arranged below the first horizontal plate and penetrates through the second horizontal plate, and/or a piston rod is arranged below the first horizontal plate and is arranged between the second horizontal plate and the inner wall of the sleeve.
The invention has the advantages that:
(1) with increasing deformation, the stiffness changed from K2 to K1K2/(K1+ K2), then to [ K1K2/(K1+ K2) + K3) ]; or K2 is directly changed into [ K1K2/(K1+ K2) + K3) ], K3> K2, so that the deformation is increased, and the rigidity is increased.
(2) A stop is arranged on the inner surface of the sleeve 7-2, the distance between the lower surface of the second horizontal plate and the stop is (F-G)/K2 in the initial state, and the rigidity of the vibration isolation support is as follows: k2 becomes K1 (requirement K1> K2, i.e. to satisfy the increase in stiffness with increasing deformation), and K1+ K3, which is the same as the teaching of CN100478539A, CN 101275442A.
(3) Viscous liquid is filled between the inner wall of the sleeve and the third horizontal plate, and a piston rod is arranged below the first horizontal plate; the piston rod is arranged below the first horizontal plate and penetrates through the second horizontal plate, and/or the piston rod is arranged below the first horizontal plate and is arranged between the second horizontal plate and the inner wall of the sleeve, so that the vibration isolation support has a damping effect.
Drawings
The invention will be further described in detail with reference to examples of embodiments shown in the drawings to which, however, the invention is not restricted.
Fig. 1 is a mounting structure of a preload spring between a first horizontal plate and a second horizontal plate according to the first embodiment.
Fig. 2 is a design view of the vibration isolation mount according to the first embodiment.
Fig. 3 is a design diagram of a spring rate adjustment device of the second embodiment.
Fig. 4 is a design view of the vibration isolation mount according to the second embodiment.
Fig. 5 is a design diagram of a circular cell of the sleeve of the second embodiment.
FIG. 6 is a cross-sectional view of a square sleeve according to the second embodiment.
Fig. 7 is a design view of the vibration isolation mount according to the third embodiment.
Fig. 8 is a design view of the vibration isolation mount according to the fourth embodiment.
Fig. 9 is a plan view of a piston rod according to a fourth embodiment.
Detailed Description
The first embodiment is as follows: CN100478539A presents the technical idea of variable stiffness vibration isolation, which relies on pre-stressed springs and compensation springs to achieve. However, it has several problems:
(1) when the compensation support descends, the compensation spring is pressed to participate in work; however, the compensating spring is normally separate from the compensating support; when the compensating support moves upwards, how the compensating spring can also participate in tension is not described in the literature;
(2) whether the pre-compression spring can adopt other modes to realize pre-compression or not.
The invention of the present application starts from the solution of the second problem, where the pre-compression in CN100478539A is initially achieved by the weight of the building, which then does not facilitate the mounting of the support; this application adopts prestressing tendons to realize the pre-compaction between the spring.
As shown in fig. 1, a pre-compression spring 4 is installed between a first horizontal plate 1 and a second horizontal plate 2, a prestressed tendon 6 is also installed between the first horizontal plate 1 and the second horizontal plate 2, and 2 anchors of the prestressed tendon 6 are respectively anchored on the upper side of the first horizontal plate 1 and the lower side of the second horizontal plate 2; the pre-pressing state of the spring 4 is realized by stretching and anchoring the prestressed tendon 6;
the specific stress condition is as shown in fig. 2, the prestressed tendon 6 is pulled to provide a tensile force for the first horizontal plate 1 and the second horizontal plate 2, and the spring 4 is compressed to provide a compressive force for the first horizontal plate 1 and the second horizontal plate 2.
The structure of the first horizontal plate 1 and the second horizontal plate 2, although it achieves the pre-compression of the spring, differs from the design of CN100478539A in the following ways, the first horizontal plate 1 and the second horizontal plate 2 of the present application exhibit the following characteristics due to the presence of the tendon 6:
because the elastic modulus of the prestressed tendons 6 is much larger than that of the springs 4, when the first horizontal plate 1 is subjected to tensile force, the tensile force is borne by the prestressed tendons 6, and the first horizontal plate 1 and the second horizontal plate 2 behave as rigid bodies; when the pressure applied to the first horizontal plate 1 is smaller than the initial pretension force of the tendon 6, the spring 4 will not exert new pressure, and the first horizontal plate 1 and the second horizontal plate 2 behave as a rigid body; when the pressure applied on the first horizontal plate 1 is larger than the pretension force of the prestressed tendon 6, the spring 4 bears the weight completely;
the prestressed tendons 6 adopt steel wires, cables and the like, namely are bent under a pressed state and have no bearing capacity;
CN100478539A teaches variable stiffness: the greater the force, the greater the stiffness.
CN101275442A by the teaching of yan vims proposes a variable stiffness teaching: the greater the deformation of the seat, the greater the stiffness.
The device of the present application, which is composed of the first horizontal plate 1 and the second horizontal plate 2, behaves as a rigid body and has an excessive stiffness when the pressure is low, and therefore, when the device of the first horizontal plate 1 and the second horizontal plate 2 is connected in parallel with other springs, the behavior remains the same: when the pressure is less than the initial pre-pressure of the prestressed tendon 6, other springs can not deform.
Therefore, the device formed by the first horizontal plate 1 and the second horizontal plate 2 can only be designed in parallel with other springs.
The teaching from CN100478539A, CN101275442A shows that the rigidity gradually increases with the increase of the deformation.
As shown in fig. 2, a third horizontal plate 3 is disposed below the second horizontal plate 2, and a second spring 3 is connected between the second horizontal plate 2 and the third horizontal plate 3; a spring stiffness adjusting device 7 is arranged between the first horizontal plate 1 and the third horizontal plate 3;
the spring rate adjustment device 7 includes: a pressure lever 7-1 below the first horizontal plate 1, a sleeve 7-2 above the third horizontal plate 3, a third spring 7-3 and an adjusting cavity 7-4;
one end of a third spring 7-3 is connected with the lower part of the adjusting cavity 7-4, and the other end is connected with the upper part of the third horizontal plate 3;
the pressure lever 7-1 enters the adjusting cavity 7-4, and the bottom of the pressure lever is away from the adjusting cavity 7-4;
the side part of the pressure lever 7-1 is provided with a protruding part 7-5, the protruding part 7-5 of the pressure lever 7-1 is arranged in the adjusting cavity 7-4, and a distance is reserved between the protruding part 7-5 and the upper surface of the adjusting cavity 7-4; the adjustment chamber 7-4 is arranged in the sleeve 7-2.
The stiffness of the pre-compression spring 4 is denoted as K1, the stiffness of the second spring 5 is denoted as K2, and the stiffness of the third spring 7-3 is denoted as K3.
The vibration isolation support is designed as follows:
(1) under the action of a static vertical load G, only the second spring 5 provides a supporting stiffness and deforms to G/K2, which is in an initial state; the design requirement G is less than the pretension force F of the prestressed tendon 6;
(2) from the initial state, when subjected to vibration, at a displacement between the first and third horizontal plates of less than or equal to (F-G)/K2, only the second springs 5 still provide the supporting stiffness; the design requirements are as follows: in the initial state, the distance between the bottom of the pressure lever and the adjusting cavity 7-4 is more than or equal to: (F-G)/K2;
(3) when the displacement between the first horizontal plate and the third horizontal plate is larger than (F-G)/K2, the pre-pressing spring is connected with the second spring in series and then connected with the third spring in parallel, and the rigidity is [ K1K2/(K1+ K2) + K3], the design is as above;
that is, as the deformation increases, the rigidity changes from K2 to K1K2/(K1+ K2), and then to [ K1K2/(K1+ K2) + K3 ]; or the rigidity is directly changed from K2 to [ K1K2/(K1+ K2) + K3) ], K3> K2, so that the deformation is increased and the rigidity is increased.
In the second embodiment, in order to make the spring participate in the tension, the more reasonable design should be: in the initial state (static load), the upper surface of the projection 7-5 and the adjustment cavity 7-4; the difficulty is how to install the pressure lever 7-1;
the compression bar 7-1 is installed in an initial state, the compression bar 7-1 penetrates through the first horizontal plate 1, threads are arranged on the outer surface of the compression bar 7-1, 2 thread caps 9 are arranged on the upper portion of the compression bar 7-1, the 2 thread caps 9 are respectively located above and below the first horizontal plate 1, after the height of the compression bar 7-1 is adjusted, the compression bar 7-1 is clamped on the first horizontal plate 1 through the 2 thread caps 9, and then the compression bar 7-1 is fixed.
Example two: in an initial state, the distance between the bottom of the pressure lever and the adjusting cavity 7-4 is larger than: (F-G)/K2, the stiffness changed from K2 to K1K2/(K1+ K2) and then to [ K1K2/(K1+ K2) + K3 ]; and from K2 to K1K2/(K1+ K2), the rigidity becomes small, unlike the teaching of CN100478539A, CN 101275442A.
A stop is arranged on the inner surface of the sleeve 7-2, the distance between the lower surface of the second horizontal plate and the stop is (F-G)/K2 in the initial state, and the rigidity of the vibration isolation support is as follows: k2 becomes K1 (requirement K1> K2, i.e. to satisfy the increase in rigidity with the increase in deformation), becomes K1+ K3.
The sleeve 7-2 comprises an inner wall and an outer wall, the cross sections of the inner wall and the outer wall are circular or rectangular, the size of the inner wall is larger than the range of the second horizontal plate, and the adjusting cavity 7-4 is arranged between the inner wall and the outer wall;
a plurality of cells are uniformly distributed in the sleeve 7-2, and the adjusting cavity 7-4 and the third spring are arranged in the cells;
example three: a viscous damper 11 is installed between the first and third horizontal plates, and is disposed outside the outer wall of the sleeve 7-2.
Example four: the inner wall of the sleeve 7-2 is closed, viscous liquid is filled between the inner wall of the sleeve 7-2 and the third horizontal plate, and a piston rod 12 is arranged below the first horizontal plate; the piston rod 12 is arranged below the first horizontal plate and penetrates through the second horizontal plate, and/or the piston rod 12 is arranged below the first horizontal plate and is arranged between the second horizontal plate and the inner wall of the sleeve 7-2.
The above-mentioned embodiments are only for convenience of description, and are not intended to limit the present invention in any way, and those skilled in the art will understand that the technical features of the present invention can be modified or changed by other equivalent embodiments without departing from the scope of the present invention.
Claims (5)
1. A vertical vibration isolation/shock support of variable rigidity which characterized in that includes: the device comprises a first horizontal plate, a second horizontal plate and a third horizontal plate; a pre-pressing spring is arranged between the first horizontal plate and the second horizontal plate, a prestressed tendon is also arranged between the first horizontal plate and the second horizontal plate, and 2 anchorage devices of the prestressed tendon are respectively anchored on the upper side of the first horizontal plate and the lower side of the second horizontal plate; the pre-pressing spring is in a pre-pressing state by stretching and anchoring the pre-stressed tendons;
a third horizontal plate is arranged below the second horizontal plate, and a second spring is connected between the second horizontal plate and the third horizontal plate; a spring stiffness adjusting device is arranged between the first horizontal plate and the third horizontal plate;
the spring rate adjusting device includes: the pressure lever is arranged below the first horizontal plate, the sleeve is arranged above the third horizontal plate, the third spring and the adjusting cavity are arranged on the third horizontal plate;
one end of the third spring is connected with the lower part of the adjusting cavity, and the other end of the third spring is connected with the upper part of the third horizontal plate; the pressure lever enters the adjusting cavity, and the bottom of the pressure lever is away from the adjusting cavity; the side part of the pressure lever is provided with a protruding part which is arranged in the adjusting cavity;
the adjusting cavity is arranged in the sleeve;
under the action of a static vertical load G, the second spring provides supporting rigidity, G is less than the pretension force F of the prestressed tendon, and the prestressed tendon is in an initial state;
under initial condition, the bottom of depression bar and the distance that adjusts the cavity and leave is more than or equal to: (F-G)/K2, wherein K2 represents the stiffness of the second spring;
the third spring has a stiffness greater than the stiffness of the second spring.
2. The variable stiffness vertical vibration isolation/damping mount according to claim 1, wherein in an initial state, the protrusion is in contact with an upper surface of the adjustment cavity; the depression bar is installed under initial condition, and the depression bar passes first horizontal plate, is provided with the screw thread at the surface of depression bar, is provided with 2 screw caps on the upper portion of depression bar, and 2 screw caps are located the higher authority of first horizontal plate respectively and below, and the back is good in the altitude mixture control of depression bar, then through pressing from both sides the depression bar tight at first horizontal plate with 2 screw caps, and then fixed depression bar.
3. A variable rate vertical vibration isolation/damping mount as claimed in claim 1, wherein a stopper is provided on a surface of the sleeve facing the second horizontal plate, a distance between a lower surface of the second horizontal plate and the stopper is (F-G)/K2 in an initial state, and the rate of the pre-compression spring is greater than the rate of the second spring.
4. The variable stiffness vertical vibration isolation/damping mount according to claim 1, wherein the sleeve comprises an inner wall and an outer wall, the inner wall and the outer wall have a closed circular or rectangular cross section, the inner wall has a size larger than the range of the second horizontal plate, and the adjustment cavity is disposed between the inner wall and the outer wall; a plurality of cells are uniformly distributed in the sleeve, and the adjusting cavity and the third spring are arranged in the cells.
5. A variable stiffness vertical vibration isolation/damping mount as claimed in claim 4, wherein a viscous damper is installed between the first horizontal plate and the third horizontal plate, the viscous damper being disposed outside the outer wall of the sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910005710.6A CN109736446B (en) | 2019-01-03 | 2019-01-03 | Vertical vibration isolation/shock support with variable rigidity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910005710.6A CN109736446B (en) | 2019-01-03 | 2019-01-03 | Vertical vibration isolation/shock support with variable rigidity |
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| CN109736446A CN109736446A (en) | 2019-05-10 |
| CN109736446B true CN109736446B (en) | 2020-10-30 |
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| CN201910005710.6A Active CN109736446B (en) | 2019-01-03 | 2019-01-03 | Vertical vibration isolation/shock support with variable rigidity |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110468695B (en) * | 2019-08-27 | 2021-05-28 | 天津大学 | Rigidity-variable three-dimensional shock isolation method and device |
| CN111075049B (en) * | 2020-01-03 | 2021-06-15 | 同济大学 | Take three-dimensional vibration isolation support of power consumption of tensile function |
| CN111911531B (en) * | 2020-07-29 | 2021-12-24 | 中国航发湖南动力机械研究所 | Return type elastic supporting structure and engine |
| CN114203036B (en) * | 2021-11-30 | 2024-06-25 | 长沙惠科光电有限公司 | Backlight module and display device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4148793B2 (en) * | 2003-02-04 | 2008-09-10 | 特許機器株式会社 | Dynamic vibration absorber |
| CN100478539C (en) * | 2007-04-06 | 2009-04-15 | 北京工业大学 | Vertical shock-absorbing stand with variable rigidity and damping |
| CN106567588A (en) * | 2016-10-17 | 2017-04-19 | 南京大德减震科技有限公司 | Three-dimensional shock isolation device with vertical initial stiffness capable of being preset |
| CN108425433B (en) * | 2018-02-05 | 2019-08-06 | 同济大学 | A kind of adaptive stiffness characteristics mobile decoupling formula three-dimensional isolation/vibration support |
| CN109113407A (en) * | 2018-10-10 | 2019-01-01 | 徐赵东 | A kind of multidimensional with anti-pull-out property is every vibration absorber and its every oscillation damping method |
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Effective date of registration: 20200929 Address after: 350700, building 18, Nanhu garden, camphor city, Yongtai County, Fujian, Fuzhou 202 Applicant after: Yongfu Construction Engineering Group Co., Ltd Address before: 045000 Xinhu 462, Nanzhuang Mining Area 3, Yangquan City, Shanxi Province Applicant before: Tian Li |
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