CN216618360U - Closed quasi-zero rigidity low-frequency vibration isolation device with active negative rigidity - Google Patents
Closed quasi-zero rigidity low-frequency vibration isolation device with active negative rigidity Download PDFInfo
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- CN216618360U CN216618360U CN202123084748.9U CN202123084748U CN216618360U CN 216618360 U CN216618360 U CN 216618360U CN 202123084748 U CN202123084748 U CN 202123084748U CN 216618360 U CN216618360 U CN 216618360U
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Abstract
The utility model discloses a closed quasi-zero stiffness low-frequency vibration isolation device with active negative stiffness, which comprises a shell, a movable platform, an upper fixed block, a transmission rod, a steel sheet, a lower fixed block and a static platform, wherein the shell is provided with a plurality of through holes; the movable platform, the shell and the static platform form a closed space. The lower fixing block is matched with the shell, the upper fixing block is matched with the shell, the spring steel sheet is arc-shaped, and the arc top is contacted with the ball in the transmission rod. The vibration isolation device realizes the vibration isolation in the axial direction of the space by combining the transmission rod and the spring steel sheet, can improve the bearing capacity or achieve low natural frequency, and can achieve the vibration isolation effect in a short time.
Description
Technical Field
The utility model relates to the field of vibration isolation devices, in particular to a closed quasi-zero-stiffness low-frequency vibration isolation device.
Background
In recent years, quasi-zero stiffness devices are often used for designing some vibration damping platform branches, and the quasi-zero stiffness devices are widely concerned in low-frequency vibration isolation of some heavy equipment because of the characteristics that the dynamic stiffness is close to zero and the characteristics that high bearing capacity and low natural frequency can be considered.
The existing vibration isolation technology is widely applied to engineering, and common quasi-zero stiffness vibration isolators are simple in structure and convenient to assemble, but are poor in vibration isolation effect and incapable of realizing low-frequency vibration isolation; although the traditional quasi-zero stiffness vibration isolator can realize low-frequency vibration isolation and even ultra-low-frequency vibration isolation, the traditional quasi-zero stiffness vibration isolator has the defects of complex structure and the like.
Disclosure of Invention
Based on the problems, the utility model provides a closed quasi-zero-stiffness low-frequency vibration isolation with active negative stiffness
The device realizes the vibration isolation in the axial direction of the space by combining the transmission rod and the spring steel sheet, can improve the bearing capacity or reach low natural frequency, and ensures that the vibration isolation device can achieve the vibration isolation effect in a short time.
The adopted technical scheme is as follows: a closed quasi-zero stiffness low-frequency vibration isolation device with active negative stiffness comprises a shell, a movable platform, an upper fixing block, a transmission rod, a steel sheet, a lower fixing block and a static platform; the movable platform, the shell and the static platform form a closed space;
the inner wall of the shell is provided with an upper sliding block and a lower sliding block;
the outer side of the lower fixed block is provided with a lower chute; the lower sliding groove slides downwards along the lower sliding block and is matched with the lower sliding block, and the lower fixing block is arranged in the shell; the lower fixing block is fixed with the static platform; a round hole is formed in the center of the lower fixing block, and a spring is placed in the round hole;
the center of the upper fixed block is provided with a through hole, the two sides of the upper fixed block are provided with upper chutes, and the upper chutes are matched with the upper sliding block of the shell to fix the upper fixed block and the shell; a cavity is formed between the upper fixing block and the lower fixing block; two corresponding steel sheets are placed in the cavity; the upper end of the steel sheet is contacted with the upper fixing block; the lower end of the steel sheet is contacted with the lower fixing block;
the middle of the transmission rod is spherical; the lower end of the transmission rod penetrates through a round hole of the lower fixing block to be contacted with the spring; the upper end of the transmission rod penetrates through a through hole of the upper fixed block and is screwed in and fixed with the movable platform through a nut; the upper end of the transmission rod is provided with a bearing platform.
The steel sheet is arc-shaped, and the arc top is contacted with the sphere in the transmission rod.
Furthermore, the lower fixing block is square, and the upper fixing block is square.
Furthermore, the steel sheet is a spring steel sheet which plays a role in negative rigidity.
Further, the ball shape in the transmission rod is solid.
Further, the lower fixing block comprises a lower first fixing block and a lower second fixing block; the second fixed block at the lower part is fixed with the static platform; the upper surface of the lower second fixed block is in close contact with the lower surface of the lower first fixed block.
Further, the upper fixing block comprises an upper first fixing block and an upper second fixing block; the upper first fixed block is fixed with the movable platform; the lower surface of the upper first fixed block is in close contact with the upper surface of the upper second fixed block.
When carrying a load, the middle sphere of the transmission rod is positioned at the center of the cavity, and the spring steel sheet generates transverse pressing force on the sphere, so that theoretically, the spherical transmission rod is considered to provide negative rigidity; while the bottom spring is compressed by the actuator rod to provide a positive stiffness.
When the transmission rod is subjected to external interference load, the transmission rod moves axially, the ball in the middle of the transmission rod moves downwards to extrude the spring (positive stiffness spring) downwards, and in the process, the positive pressure provided by the spring steel sheet for the center ball of the transmission rod is reduced along with the increase of displacement (negative stiffness characteristic).
Before the assembly, the elastic steel sheets are in a relaxed state, and in the assembly process of the transmission rod, the transverse pretightening force can be generated on the elastic steel sheets under the action of the transmission rod, and at the moment, the two pre-compressed elastic steel sheets are used as negative stiffness elements and form a quasi-zero stiffness vibration isolation system together with a spring in a lower fixed block in the vertical direction. The lower end of the transmission rod penetrates through a round hole of the lower fixing block and is in contact with the spring to provide positive stiffness.
The utility model has the maximum static stiffness when zero load is applied, the transmission rod moves downwards along with the movable platform after the load is applied, after a certain vibration amplitude range is reached, the pre-compressed spring steel sheet provides the reverse acting force with the spring to realize the quasi-zero stiffness together, namely, the transmission rod is restrained by the installation space, and after the load is applied, the first is the reverse acting force generated by the vertical spring, and the second is the resultant force of the axial friction force generated by the transmission rod and the spring steel sheet and the horizontal force generated by the spring steel sheet. The utility model can improve the bearing capacity or achieve low natural frequency, so that the vibration isolation device can achieve certain effect in a short time.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the internal structure of the present invention;
FIG. 3 is a schematic structural view of the housing of the present invention;
FIG. 4 is a schematic structural view of a stationary platform and a second lower fixed block according to the present invention;
FIG. 5 is a schematic view of the stressed structure of the spring steel plate when the spring steel plate is under load.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1 to 5, the closed quasi-zero stiffness low-frequency vibration isolation device with active negative stiffness comprises a housing 1, a movable platform 2, an upper fixed block 3, a transmission rod 4, a spring steel sheet 5, a lower fixed block 6 and a static platform 7; the movable platform 2, the shell 1 and the static platform 7 form a closed space. The lower fixing block is square, and the upper fixing block is square.
The inner wall of the shell 1 is provided with an upper slide block 11 and a lower slide block 12; the outer side of the lower fixed block 6 is provided with a lower sliding chute 61; the lower chute 61 slides downwards along the lower slide block 12 and is matched with the lower slide block 12, and the lower fixed block 6 is arranged in the shell 1; the center of the lower fixing block 6 is provided with a round hole 64, and a spring is placed in the round hole 64.
The lower fixing block 6 includes a lower first fixing block 62 and a lower second fixing block 63; the lower second fixed block 63 is fixed with the static platform 7; the upper surface of the lower second fixing block 63 is in close contact with the lower surface of the lower first fixing block 62.
The center of the upper fixing block 3 is provided with a through hole, the two sides of the upper fixing block are provided with upper sliding grooves 33, and the upper sliding grooves 33 are matched with the upper sliding blocks 11 of the shell 1 to fix the upper fixing block 3 and the shell 1; a cavity is formed between the upper fixing block 3 and the lower fixing block 6; two corresponding spring steel sheets 5 are placed in the cavity; the upper end of the spring steel sheet 5 is contacted with the upper fixing block 3; the lower end of the spring steel sheet 5 is contacted with a lower fixing block 6. The spring steel sheet 5 is arc-shaped, and the arc top is contacted with a ball 41 in the transmission rod 4. The adopted spring steel sheet is used as an elastic element, and the spring steel sheet is required to have good toughness, so that the chromium vanadium steel is adopted.
The upper fixing block 3 includes an upper first fixing block 31 and an upper second fixing block 32; the upper first fixed block 31 is fixed with the movable platform 2; the lower surface of the upper first fixing block 31 is in close contact with the upper surface of the upper second fixing block 32.
The middle of the transmission rod 4 is a solid sphere 41; the lower end of the transmission rod 4 penetrates through a round hole 64 of the lower fixing block 6 to be contacted with the spring; the upper end of the transmission rod 4 penetrates through the through hole of the upper fixed block 3 and is screwed in and fixed with the movable platform 2 through a nut; the upper end of the transmission rod 4 is provided with a bearing platform 8.
When carrying a load, the spherical shape in the middle of the transmission rod is positioned at the center of the cavity, the system is in a quasi-zero rigidity state at the moment, and when the system receives an external interference load, vibration can be reduced near the quasi-zero rigidity state.
Claims (7)
1. The utility model provides a closed accurate zero rigidity low frequency vibration isolation device with initiative negative stiffness which characterized in that: comprises a shell, a movable platform, an upper fixed block, a transmission rod, a steel sheet, a lower fixed block and a static platform; the movable platform, the shell and the static platform form a closed space;
the inner wall of the shell is provided with an upper sliding block and a lower sliding block;
the outer side of the lower fixed block is provided with a lower sliding chute; the lower sliding groove slides downwards along the lower sliding block and is matched with the lower sliding block, and the lower fixing block is arranged in the shell; the lower fixing block is fixed with the static platform; a round hole is formed in the center of the lower fixing block, and a spring is placed in the round hole;
the center of the upper fixing block is provided with a through hole, two sides of the upper fixing block are provided with upper sliding chutes, and the upper sliding chutes are matched with the upper sliding blocks of the shell to fix the upper fixing block and the shell; a cavity is formed between the upper fixing block and the lower fixing block; two corresponding steel sheets are placed in the cavity; the upper end of the steel sheet is contacted with the upper fixing block; the lower end of the steel sheet is contacted with the lower fixing block;
the middle of the transmission rod is spherical; the lower end of the transmission rod penetrates through a round hole of the lower fixing block to be in contact with a spring, and the spring provides positive stiffness; the upper end of the transmission rod penetrates through a through hole of the upper fixed block and is screwed in and fixed with the movable platform through a nut; the upper end of the transmission rod is provided with a bearing platform;
the steel sheet is arc-shaped, and the arc top is contacted with the sphere in the transmission rod.
2. The closed quasi-zero stiffness low frequency vibration isolation device according to claim 1, wherein the lower fixed block is square and the upper fixed block is square.
3. The closed quasi-zero low frequency vibration isolator with active negative stiffness as claimed in claim 1, wherein the steel plate is a spring steel plate, which applies a pressing force in a spherical shape to provide a negative stiffness.
4. The closed quasi-zero stiffness low frequency vibration isolator as claimed in claim 1, wherein the ball shape of the driving rod is solid.
5. The closed quasi-zero stiffness low-frequency vibration isolation device with the active negative stiffness as claimed in claim 1, wherein the lower fixing block comprises a lower first fixing block and a lower second fixing block; the second fixed block at the lower part is fixed with the static platform; the upper surface of the lower second fixed block is in close contact with the lower surface of the lower first fixed block.
6. The closed quasi-zero stiffness low-frequency vibration isolation device with the active negative stiffness as claimed in claim 1, wherein the upper fixing block comprises an upper first fixing block and an upper second fixing block; the upper first fixed block is fixed with the movable platform; the lower surface of the upper first fixed block is in close contact with the upper surface of the upper second fixed block.
7. The closed quasi-zero low frequency vibration isolator with active negative stiffness as claimed in claim 1, wherein when the system is in static equilibrium position while carrying load, the ball shape in the middle of the driving rod is located at the center of the cavity, and the system is in quasi-zero stiffness state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123084748.9U CN216618360U (en) | 2021-12-09 | 2021-12-09 | Closed quasi-zero rigidity low-frequency vibration isolation device with active negative rigidity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123084748.9U CN216618360U (en) | 2021-12-09 | 2021-12-09 | Closed quasi-zero rigidity low-frequency vibration isolation device with active negative rigidity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216618360U true CN216618360U (en) | 2022-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123084748.9U Active CN216618360U (en) | 2021-12-09 | 2021-12-09 | Closed quasi-zero rigidity low-frequency vibration isolation device with active negative rigidity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216618360U (en) |
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2021
- 2021-12-09 CN CN202123084748.9U patent/CN216618360U/en active Active
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