CN108167363B - Two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device - Google Patents
Two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device Download PDFInfo
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- CN108167363B CN108167363B CN201711419389.3A CN201711419389A CN108167363B CN 108167363 B CN108167363 B CN 108167363B CN 201711419389 A CN201711419389 A CN 201711419389A CN 108167363 B CN108167363 B CN 108167363B
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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
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/06—Magnetic or electromagnetic
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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
- F16F2228/063—Negative stiffness
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Abstract
The invention relates to a two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device, belonging to the technical field of vibration isolation, wherein the device comprises an upper layer vibration isolation device and a lower layer vibration isolation device; magnets which are not in contact with each other form a negative stiffness mechanism of the lower-layer vibration isolation device, a slider, a spring and the like form a positive stiffness mechanism of the lower-layer vibration isolation device, and the low-frequency vibration isolation device formed by connecting the lower-layer positive stiffness mechanism and the lower-layer negative stiffness mechanism in parallel can effectively isolate horizontal impact on a vibration-isolated object; the low-frequency vibration isolation device formed by connecting the upper layer positive and negative stiffness mechanisms in parallel can effectively isolate the vibration impact in the vertical direction on an object to be subjected to vibration isolation. The upper and lower layers of vibration isolation devices are connected through the middle connecting platform to form the two-degree-of-freedom vibration isolation device, the device is compact in structure, and has high engineering application value in the fields of automobiles, precision instruments, unmanned automatic storage and the like.
Description
Technical Field
The invention relates to a two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device, belongs to the technical field of vibration isolation, and can be widely applied to low-frequency vibration isolation in the fields of vehicles, unmanned storage trolleys, precision instruments and the like.
Background
Vibration is a common phenomenon in mechanical engineering, and is harmful in many cases, for example, mechanical vibration not only damages the precision and the service life of mechanical equipment, but also generates noise, affects the smoothness of the operation of the mechanical equipment, and adversely affects the surrounding environment. With the advance of China manufacturing 2025 and industry 4.0, the power and the rotating speed of running machinery are continuously improved, and the vibration isolation technology of equipment in the field of mechanical engineering becomes a problem to be solved. In the field of vibration isolation, there is a very significant figure:
the system has the following natural frequency that for a single-degree-of-freedom linear vibration isolation system with mass m and rigidity k
But only if the excitation frequency is greater than the natural frequency of the system
In time, the single-degree-of-freedom vibration isolation system has a vibration isolation effect. For passive vibration isolation systemWhen the system is designed for a vibration isolation object, the natural frequency of the system is already determined, and the isolation frequency domain band of the system is also determined, in order to widen the isolation vibration frequency domain band, namely, reduce the natural frequency of a passive vibration isolation system, the natural frequency of a large machine under a high bearing condition is often difficult to reduce, so that the problem of poor low-frequency resistant and low-frequency isolation vibration effect caused by high natural frequency of the system is caused; in severe cases, even low-frequency vibration is isolated, the rigidity of the system is reduced, and the problems of overlarge static deformation or instability of the system and the like are caused by the undersize rigidity. Therefore, the conventional steel spring vibration isolation device has the problem of overlarge static deformation when isolating low-frequency vibration, and faces a significant challenge that the bearing capacity and the low-frequency vibration isolation cannot be both considered. Researches in recent years show that the quasi-zero stiffness vibration isolation system has excellent characteristics of high static stiffness, low dynamic stiffness and the like, and can meet the requirements of high bearing capacity and low dynamic stiffness.
The existing quasi-zero stiffness vibration isolation platform is mostly based on a vibration isolation device with positive and negative stiffness matching, and has a good vibration isolation effect on large-displacement vibration. The following were used:
chinese patent 201310142491.9 discloses a positive and negative stiffness parallel vibration damper with compact structure, belonging to the field of precision vibration damping. The positive and negative stiffness parallel shock absorber comprises a positive stiffness air spring and a negative stiffness magnetic spring, wherein the positive stiffness air spring and the negative stiffness magnetic spring are arranged in parallel, and the negative stiffness magnetic spring is arranged in an air spring cavity. The positive stiffness air spring is a round cavity or a rectangular cavity and is used for bearing. The negative stiffness magnetic spring consists of an inner magnet, an outer magnet, an inner magnet seat and an outer magnet seat and is used for reducing the dynamic stiffness of the shock absorber. The inner magnet is in a repelling arrangement with the outer magnet. The positive and negative stiffness parallel connection shock absorber has the characteristics of high static stiffness and low dynamic stiffness, so that the shock absorber has large bearing capacity and small static deformation and can effectively isolate ultralow frequency vibration. Chinese patent 201610182527.X discloses a quasi-zero stiffness compression bar. The quasi-zero stiffness pressure lever mainly comprises a hemispherical annular bulge-universal roller-reed mechanism with negative stiffness and a vertical spring providing positive stiffness, wherein the universal roller is arranged on a reed, and the reed is supported by an annular sleeve fixed in an outer sleeve, so that the centering of the hemispherical annular bulge is ensured. The parallel combination of the positive and negative stiffness elements provides the strut with high static stiffness and low dynamic stiffness characteristics such that its stiffness at the static equilibrium position is zero and exhibits minimal stiffness characteristics near the equilibrium position. The quasi-zero stiffness compression bar can be installed on various vibration isolation platforms, so that the quasi-zero stiffness compression bar has the characteristics of high static stiffness and low dynamic stiffness in respective degree of freedom, and low-frequency vibration isolation is realized.
Chinese patent document CN 106321707 a discloses a two-degree-of-freedom ultra-low frequency vibration isolator, but it uses vibration isolators with inverted pendulum, air spring, etc. to construct vibration isolator, which is not stable in structure and easy to implement; chinese patent document CN 104033535a discloses a three-dimensional vibration isolation device suitable for low-frequency vibration, which is divided into an upper layer and a lower layer, but the upper part and the lower part are supported only by the middle guide pillar, and the upper part is unstable under the excitation of vibration signals.
The defects of the technical scheme are as follows: the vibration isolation can only be carried out in a simple one-way mode, and the vibration isolation requirement of the isolated object with variable mass cannot be met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device which is compact in structure, has large bearing capacity, can meet the vibration isolation requirement of an isolated object with variable mass, and can isolate low-frequency vibration in two directions.
The technical scheme of the invention is as follows:
a two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device comprises an upper layer vibration isolation device and a lower layer vibration isolation device;
the lower-layer vibration isolation device comprises a movable base, wherein a support is arranged on the upper surface of the movable base, a guide rail is arranged on the support, a spring and a sliding block are sleeved on the guide rail, one end of the spring is connected with the support, the other end of the spring is connected with the sliding block, and a magnet is further arranged on the upper surface of the movable base;
the upper-layer vibration isolation device comprises a middle connecting platform, a sliding block and a carrier connecting platform, wherein a supporting spring guide pillar is arranged above the middle connecting platform, a supporting spring is sleeved on the supporting spring guide pillar, one end of the supporting spring is in contact with the middle connecting platform, and the other end of the supporting spring is in contact with the supporting sliding block; the carrier connecting platform is connected with the supporting slide block through a connecting plate;
a pressure spring base is further arranged above the middle connecting platform, a pressure spring cavity is formed in the pressure spring base, a pressure spring is arranged in the pressure spring cavity, one end of the pressure spring is connected with an adjusting screw, the other end of the pressure spring is connected with a pressure rod, and the pressure rod is connected with the carrier connecting platform;
the side surface of the sliding block is connected with the middle connecting platform; magnet is equipped with below the intermediate junction platform, and the magnet of removal base upper surface sets up side by side with the magnet of intermediate junction platform below.
The lower layer vibration isolation device is provided with a negative stiffness mechanism by a non-contact magnet (a magnet on the upper surface of the moving base and a magnet below the middle connecting platform), and a spring on the guide rail is provided with a positive stiffness mechanism; the upper layer vibration isolation device provides a negative stiffness mechanism by a pressure spring and a pressure rod, and a positive stiffness mechanism is formed by a support spring and a guide device between the upper layer carrier connecting platform and the middle connecting platform.
According to the invention, the movable base is a rectangular flat plate, the number of the brackets is four, and the brackets are arranged at four corners of the movable base; the number of the guide rails is two, and the guide rails are connected between the two opposite brackets. The corresponding slider, the quantity of spring also are 4, distribute in the edge of removal base.
Further preferably, the guide rail is a cylinder, and the side face of the sliding block is connected with the middle connecting platform through a bolt.
Further preferably, the axes of the two guide rails are parallel to each other, and the axes of the two guide rails are located in the same horizontal plane.
Further preferably, the plane of opposition between the magnets is parallel to the axis of the guide rail.
According to the invention, preferably, two magnets are arranged on the upper surface of the moving base, one magnet is arranged below the middle connecting platform, the magnet below the middle connecting platform in the horizontal direction is positioned between the two magnets on the upper surface of the moving base, and the opposite surfaces of the magnets are arranged for magnetic repulsion.
According to the invention, the other end of the pressure spring is preferably connected with the pressure lever through a ball pair, and the pressure lever is connected with the carrier connecting platform through the ball pair.
According to the invention, the pressure spring base is preferably connected to the intermediate connection platform by means of screws.
Further preferably, the intermediate connection platform is a rectangular flat plate, and the pressure spring bases are arranged at four corners of the intermediate connection platform.
Preferably, two pressure spring bases are arranged on each corner of the middle connecting platform.
According to the invention, a limit cover plate is preferably arranged above the supporting spring guide column. When the supporting slide block connected with the supporting spring moves upwards, the limiting cover plate plays a limiting role.
Further preferably, the number of the supporting spring guide columns is three, and the distance between every two adjacent supporting spring guide columns is equal. The supporting spring guide columns are uniformly distributed on the middle connecting platform.
Further preferably, a rubber pad is arranged below the limiting cover plate. When the supporting slide block moves up to the position of the limiting cover plate, the rubber pad can play a role in buffering, and parts are prevented from being damaged by collision.
According to the invention, the universal wheels are preferably arranged below the movable base.
The invention has the beneficial effects that:
the technical scheme of the invention has strong bearing capacity, can isolate the isolated object with variable mass, and can realize vibration isolation in two directions, namely the horizontal translational motion direction and the vertical translational motion direction, so that the vibration signal of the equipment is obviously weakened.
The technical scheme of the invention uses universal parts such as springs, magnets and the like which are easy to manufacture and replace, has a structure divided into an upper layer and a lower layer, is clear and easy to implement, and has certain engineering application value in the fields of automobiles, precision instruments, unmanned automatic storage and the like.
Drawings
FIG. 1 is a schematic perspective view of a two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device according to the present invention;
FIG. 2 is a front view of the two-degree-of-freedom positive and negative stiffness parallel low frequency vibration isolation device of the present invention;
FIG. 3 is a side view of the two-degree-of-freedom positive and negative stiffness parallel low frequency vibration isolation device of the present invention;
FIG. 4 is a schematic diagram of an upper layer structure of the two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device of the invention;
FIG. 5 is a schematic view of the lower layer structure of the two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device of the present invention.
Wherein: 1. carrier connection platform, 2, intermediate junction platform, 3, removal base, 4, universal wheel, 5, magnet a, 6, magnet b, 7, magnet c, 8, spacing apron, 9, rubber pad, 10, connecting plate, 11, supporting slide, 12, supporting spring guide pillar, 13, supporting spring, 14, pressure spring base, 15, adjusting screw, 16, pressure spring, 17, depression bar, 18, guide rail, 19, slider, 20, spring, 21, support, 22, lower floor's vibration isolation mounting, 23, upper vibration isolation mounting.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
As shown in fig. 1-5.
Example 1:
a two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device comprises an upper layer vibration isolation device 23 and a lower layer vibration isolation device 22;
lower floor's vibration isolation mounting 22 is equipped with support 21 including removing base 3, removes base 3 upper surface, is equipped with guide rail 18 on the support 21, and the cover is equipped with spring 20 and slider 19 on the guide rail 18, and spring 20 one end is connected with support 21, and the slider 19 is connected to the spring 20 other end, removes base 3 upper surface and still is equipped with magnet.
The upper-layer vibration isolation device 23 comprises a middle connecting platform 2, a supporting slide block 11 and a carrier connecting platform 1, wherein a supporting spring guide post 12 is arranged above the middle connecting platform 2 through a bolt, a supporting spring 13 is sleeved on the supporting spring guide post 12, one end of the supporting spring 13 is in contact with the middle connecting platform 2, and the other end of the supporting spring 13 is in contact with the supporting slide block 11; the carrier connecting platform 1 is connected with the supporting slide block 11 through the connecting plate 10, the supporting slide block 11 is fixedly connected with the lower end of the connecting plate 10 through 4 bolt nuts, and the upper end of the connecting plate 10 is fixedly connected with the carrier connecting platform 1 through 7 bolt nuts.
A pressure spring base 14 is further arranged above the middle connecting platform 2, a pressure spring cavity is formed in the pressure spring base 14, a pressure spring 16 is arranged in the pressure spring cavity, one end of the pressure spring 16 is connected with an adjusting screw 15, and the adjusting screw can adjust the pre-pressure of the pressure spring; the other end of the pressure spring 16 is connected with a pressure lever 17, and the pressure lever 17 is connected with the carrier connecting platform 1;
the side surface of the slide block 19 is connected with the middle connecting platform 2 through 4 bolts; the magnet is arranged below the intermediate connecting platform 2, and the magnet on the upper surface of the movable base 3 and the magnet below the intermediate connecting platform are arranged side by side.
The lower layer vibration isolation device is provided with a negative stiffness mechanism by a non-contact magnet (a magnet on the upper surface of the moving base and a magnet below the middle connecting platform), and a spring on the guide rail is provided with a positive stiffness mechanism; the upper layer vibration isolation device provides a negative stiffness mechanism by a pressure spring and a pressure rod, and a positive stiffness mechanism is formed by a support spring and a guide device between the upper layer carrier connecting platform and the middle connecting platform.
Example 2:
the structure of the two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device is as described in embodiment 1, except that a moving base 3 is a rectangular flat plate, the number of supports 21 is four, the supports 21 are arranged at four corners of the moving base 3, and the supports 21 are symmetrically arranged on the upper surface of the moving base 3 at 90-degree intervals through bolts; the corresponding slide blocks 19 and springs 20 are also 4 in number and distributed on the edge of the movable base 3. The number of the guide rails 18 is two, and the guide rails 18 are connected between the two opposite brackets 21. The guide rail 18 is a cylinder, and the side surface of the slide block 19 is connected with the middle connecting platform 2 through bolts. The axes of the two guide rails 18 are parallel to each other, and the axes of the two guide rails 18 are located in the same horizontal plane.
Example 3:
a two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device is structurally as described in embodiment 2, except that the planes of opposition between the magnets are parallel to the axis of the guide rail.
Example 4:
the two-degree-of-freedom positive and negative rigidity parallel low-frequency vibration isolation device is structurally as described in embodiment 3, and is different from the structure that two magnets are arranged on the upper surface of a movable base: magnet a 5, magnet c 7, magnet a 5 and magnet c 7 are distributed symmetrically with respect to the moving direction. The middle connecting platform is provided with a magnet b 6 below, the magnet b 6 below the middle connecting platform is positioned between two magnets on the upper surface of the movable base in the horizontal direction, the magnet b 6 is fixedly connected with the center of the middle connecting platform 2, and the opposite surfaces of the magnets are arranged for magnetic repulsion force. The non-contact magnet a 5, the magnet c 7, and the magnet b 6 provide a negative stiffness mechanism.
Example 5:
the structure of the two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device is as described in embodiment 4, except that the other end of a pressure spring 16 is connected with a pressure lever 17 through a ball pair, and the pressure lever 17 is connected with a carrier connecting platform 1 through the ball pair.
Example 6:
the structure of the two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device is as described in embodiment 1, except that a pressure spring base 14 is fixedly connected to the upper surface of an intermediate connecting platform 2 through 4 bolts.
Example 7:
the structure of the two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device is as described in embodiment 5, except that the intermediate connecting platform 2 is a rectangular flat plate, and the pressure spring bases 14 are arranged at four corners of the intermediate connecting platform 2. Two pressure spring bases 14 are arranged on each corner of the middle connecting platform 2. 8 pressure spring bases are uniformly distributed on the upper surface of the middle connecting platform 2 at intervals of 90 degrees in a group of 2. The ball pairs for connection are also uniformly distributed on the lower surface of the carrier connecting platform 1 by taking 2 balls as a group and taking 90 degrees as intervals.
When the moving base 3 is excited along the axial direction of the guide rail 18, the magnet b 6, the magnet a 5 and the magnet c 7 generate relative motion, at this time, the magnetic repulsion force can form a negative stiffness spring mechanism, the slide block 19 moves along the guide rail 18 to compress the motion direction spring 20 to form a positive stiffness mechanism, the positive stiffness mechanism and the negative stiffness mechanism are connected in parallel through the middle connecting platform 2 to form a lower layer vibration isolation device 22, vibration excitation from the horizontal direction is isolated, and a carrier horizontal direction vibration signal of the carrier connecting platform 1 is weakened.
When the moving base 3 is excited by vibration from the vertical direction, because the lower layer vibration isolation device 22 can only isolate vibration excitation signals in the horizontal direction, the vibration signals in the vertical direction are not weakened and are transmitted to the upper layer vibration isolation device 23 through the middle connecting platform 2, and when the upper layer vibration isolation device 23 is excited by the vibration in the direction, the supporting spring 13 can move along the supporting spring guide post 12, and the supporting spring 13 is compressed or released to form a positive stiffness mechanism; the deformation of the supporting spring 13 can cause the supporting slide block 11, the connecting plate 10 and the carrier connecting platform 1 to move in the vertical direction together, the vertical movement of the carrier connecting platform 1 can compress or release the pressure spring 16 through the ball pair and the pressure rod 17 to form a negative stiffness mechanism, the positive stiffness mechanism and the negative stiffness mechanism form an upper layer vibration isolation device 23 through the carrier connecting platform 1 to isolate vibration excitation from the vertical direction, and therefore vibration signals of the carrier on the carrier connecting platform 1 in the vertical direction are weakened.
The upper layer of vibration isolation device and the lower layer of vibration isolation device are connected through the middle connecting platform to form a two-degree-of-freedom vibration isolation device, and two-degree-of-freedom vibration isolation is carried out on equipment.
Example 8:
the structure of the two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device is as described in embodiment 1, except that the upper end of a supporting spring guide post 12 is fixedly connected with a limiting cover plate 8 through a bolt. When the supporting slide block 11 connected with the supporting spring 13 moves upwards, the limiting cover plate 8 plays a limiting role.
The number of the support spring guide columns 12 is three, the distance between two adjacent support spring guide columns 12 is equal, and the three support spring guide columns 12 are uniformly distributed in the center of the middle connecting platform 2 at intervals of 120 degrees.
Example 9:
the structure of the two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device is as described in embodiment 8, except that a rubber pad 9 is arranged below the limiting cover plate 8. When the supporting slide block 11 moves up to the position of the limit cover plate 8, the rubber pad 9 can play a role of buffering.
Example 10:
the structure of the two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device is as described in embodiment 1, except that a universal wheel 4 is arranged below a movable base 3. The universal wheel 4 is fixedly connected with the movable base through 4 bolts, and the 4 universal wheels are uniformly distributed on the diagonal line of the movable base at 90-degree intervals.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that changes may be made without departing from the scope of the invention, and it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
Claims (13)
1. A two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device is characterized by comprising an upper layer vibration isolation device and a lower layer vibration isolation device;
the lower-layer vibration isolation device comprises a movable base, wherein a support is arranged on the upper surface of the movable base, a guide rail is arranged on the support, a spring and a sliding block are sleeved on the guide rail, one end of the spring is connected with the support, the other end of the spring is connected with the sliding block, and a magnet is further arranged on the upper surface of the movable base;
the upper-layer vibration isolation device comprises a middle connecting platform, a supporting sliding block and a carrier connecting platform, wherein a supporting spring guide pillar is arranged above the middle connecting platform, a supporting spring is sleeved on the supporting spring guide pillar, one end of the supporting spring is in contact with the middle connecting platform, and the other end of the supporting spring is in contact with the supporting sliding block; the carrier connecting platform is connected with the supporting slide block through a connecting plate;
a pressure spring base is further arranged above the middle connecting platform, a pressure spring cavity is formed in the pressure spring base, a pressure spring is arranged in the pressure spring cavity, one end of the pressure spring is connected with an adjusting screw, the other end of the pressure spring is connected with a pressure rod, and the pressure rod is connected with the carrier connecting platform;
the side surface of the sliding block is connected with the middle connecting platform; magnet is equipped with below the intermediate junction platform, and the magnet of removal base upper surface sets up side by side with the magnet of intermediate junction platform below.
2. The two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device according to claim 1, wherein the moving base is a rectangular flat plate, the number of the brackets is four, and the brackets are arranged at four corners of the moving base; the number of the guide rails is two, and the guide rails are connected between the two opposite brackets.
3. The two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device as claimed in claim 2, wherein the guide rail is a cylinder, and the side surface of the sliding block is connected with the middle connecting platform through a bolt.
4. The two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device according to claim 3, wherein the axes of the two guide rails are parallel to each other, and the axes of the two guide rails are located in the same horizontal plane.
5. The two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device as claimed in claim 4, wherein a plane between the magnet on the upper surface of the moving base and the magnet below the intermediate connecting platform is parallel to the axis of the guide rail.
6. The two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device as claimed in claim 1, wherein two magnets are arranged on the upper surface of the moving base, one magnet is arranged below the intermediate connecting platform, the magnet below the intermediate connecting platform in the horizontal direction is located between the two magnets on the upper surface of the moving base, and the opposite surfaces of the magnets are arranged in a magnetic repulsion mode.
7. The two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device according to claim 1, wherein the other end of the pressure spring is connected with a pressure lever through a ball pair, and the pressure lever is connected with the carrier connecting platform through the ball pair; the pressure spring base is connected with the middle connecting platform through a bolt.
8. The two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device according to claim 1, wherein the intermediate connection platform is a rectangular flat plate, and the pressure spring bases are arranged at four corners of the intermediate connection platform.
9. The two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device according to claim 8, wherein two pressure spring bases are arranged on each corner of the intermediate connection platform.
10. The two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device as claimed in claim 1, wherein a limiting cover plate is arranged above the supporting spring guide column.
11. The two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device according to claim 10, wherein the number of the supporting spring guide columns is three, and the distance between two adjacent supporting spring guide columns is equal.
12. The two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device as claimed in claim 10, wherein a rubber pad is arranged below the limiting cover plate.
13. The two-degree-of-freedom positive-negative stiffness parallel low-frequency vibration isolation device as claimed in claim 1, wherein universal wheels are arranged below the moving base.
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| CN108757799B (en) * | 2018-08-31 | 2024-04-26 | 天津航天机电设备研究所 | Flexible quasi-zero stiffness vibration isolation device |
| CN109385937A (en) * | 2018-12-18 | 2019-02-26 | 浙江天铁实业股份有限公司 | A kind of negative stiffness vibration absorber |
| CN109435800B (en) * | 2018-12-21 | 2024-06-21 | 安徽工程大学 | Low-frequency vibration isolation seat |
| CN109532589A (en) * | 2018-12-21 | 2019-03-29 | 安徽工程大学 | Double-layer vibration isolating seat |
| CN110259864B (en) * | 2019-06-28 | 2021-08-17 | 北京无线电测量研究所 | Decoupling vibration isolation device |
| CN111335496B (en) * | 2020-03-17 | 2021-02-19 | 东北大学秦皇岛分校 | Nonlinear negative stiffness multidimensional vibration damper |
| CN113060398B (en) * | 2021-03-19 | 2022-06-10 | 深圳市爱租机科技有限公司 | Transport collision-prevention device for rental machine and working method thereof |
| CN113218605B (en) * | 2021-04-08 | 2022-06-14 | 中国科学院声学研究所 | Movable ultralow-vibration large-scale equipment test platform |
| CN113623346B (en) * | 2021-07-09 | 2022-04-22 | 北京科技大学 | Broadband vibration isolator with periodic structure |
| CN117052829B (en) * | 2023-09-15 | 2024-04-16 | 北京科技大学 | Parallel tension integral quasi-zero stiffness vibration isolator |
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| CN203892446U (en) * | 2014-06-05 | 2014-10-22 | 哈尔滨工程大学 | Three-dimensional vibration isolation device suitable for low-frequency vibration |
| CN204226542U (en) * | 2014-09-18 | 2015-03-25 | 中国地震局工程力学研究所 | Comprise the three-dimensional shock isolation pedestal of spring damping guide rod device |
| CN104401240B (en) * | 2014-11-24 | 2016-09-21 | 吉林大学 | A kind of off highway vehicle seat two-dimension non linearity vibration isolation suspension |
| CN105370780A (en) * | 2015-10-30 | 2016-03-02 | 合肥工业大学 | Shock absorber capable of carrying out energy collection |
| CN206770511U (en) * | 2017-06-09 | 2017-12-19 | 石狮梵源服饰有限公司 | A kind of textile machine base buffer unit |
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