Simple pendulum air floatation vibration isolator

Abstract

The utility model relates to the technical field of air floating vibration isolators, in particular to a simple pendulum air floating vibration isolator which comprises a shell, an air spring, a chain with the adjustable length and a hollow cylinder, the shell is fixed to the ground, the air spring is installed in the shell through the chain to form a simple pendulum structure, the air spring is filled with compressed gas, and the hollow cylinder is fixed to the shell. The upper end of the air spring is used for installing equipment needing vibration isolation. The hollow cylinder is fixed to the bottom in the shell, the hollow cylinder is filled with damping liquid, and the bottom of the air spring extends into the damping liquid. According to the vibration isolator, the air spring is hung through the chain with the adjustable length to form a simple pendulum, damping liquid with different viscosities can be selected, the vibration isolator can rapidly return to the initial stable position after being disturbed, and the damping ratio of the vibration isolator can be flexibly adjusted.

Description

Technical Field

[0001] This application relates to the technical field of air-bearing vibration isolators, and in particular to a single-pendulum air-bearing vibration isolator. Background Technology

[0002] Air-bearing vibration isolators are devices used to reduce the interference of vibration on a system. They utilize the pressure of compressed gas to generate supporting force and isolate vibration, thereby reducing the interference of vibration on the system and improving the system's operating accuracy and stability. Air-bearing vibration isolators are widely used in industrial manufacturing, laboratory and medical equipment, consumer electronics, and shipbuilding and aircraft.

[0003] In related technologies, air springs, with their low vertical stiffness, are widely used in various vertical vibration isolation mechanisms; pendulums, with their low horizontal stiffness, are widely used in various horizontal vibration isolation mechanisms. A vibration isolator that uses an air spring and a pendulum in series achieves a horizontal stiffness approximately equal to that of the pendulum and a vertical stiffness approximately equal to that of the air spring, allowing the isolator to achieve low stiffness in both the vertical and horizontal directions simultaneously.

[0004] In practical use, it has been found that when the stiffness is low, the vibration isolator is very sensitive to direct disturbances, and the damping ratio of the vibration isolator is difficult to adjust. When the vibration isolator is subjected to a large disturbance, it is difficult to quickly return to the initial stable position, which affects the stability of the system. Utility Model Content

[0005] In order to provide a vibration isolator that can adjust the damping ratio and quickly return to the initial stable position after being disturbed, this application provides a single pendulum air-bearing vibration isolator.

[0006] This application provides a single-pendulum air-bearing vibration isolator, which adopts the following technical solution:

[0007] A pendulum air-bearing vibration isolator includes a housing, an air spring, an adjustable-length chain, and a hollow cylinder. The housing is fixed to the ground. The air spring is installed in the housing via the chain to form a pendulum structure. The air spring is filled with compressed gas, and its upper end is used to install equipment requiring vibration isolation. The hollow cylinder is fixed to the bottom of the housing and is filled with damping fluid. The bottom of the air spring extends into the damping fluid.

[0008] By adopting the above technical solution, when vibration is transmitted to the pendulum air-bearing vibration isolator, the vertical vibration causes the compressed gas in the air spring chamber to reciprocate, thereby achieving the effect of elastic buffering and realizing the effect of vertical vibration isolation; the horizontal vibration causes the air spring to perform pendulum motion in the outer shell, while the bottom of the air spring swings in the hollow cylinder. The damping fluid consumes kinetic energy and converts it into heat energy, which reduces the swing amplitude of the air spring until it returns to the equilibrium position, thus realizing the effect of horizontal vibration isolation.

[0009] Optionally, the air spring includes an annular body, a first fixing plate, a second fixing plate, a rubber diaphragm, a pressure ring, and a support plate. The annular body has openings at its upper and lower ends. The first fixing plate is fixed to the top end of the annular body, and the second fixing plate is fixed to the bottom end of the annular body. A second mounting hole is provided on the first fixing plate, and the rubber diaphragm is used to close the second mounting hole to form the air chamber of the air spring. The pressure ring is used to fix the outer edge of the rubber diaphragm to the first fixing plate. The support plate abuts against the upper part of the middle portion of the rubber diaphragm, and the area between the middle portion and the outer edge of the rubber diaphragm is a movable part.

[0010] By adopting the above technical solution, an air chamber for filling compressed gas is formed between the rubber diaphragm, the annular body, the first fixed plate and the second fixed plate. When vertical vibration is transmitted to the pendulum air-float vibration isolator, the rubber diaphragm deforms, and the air spring adjusts the pressure of the compressed gas in the air chamber, thereby achieving the effect of vibration isolation in the vertical direction.

[0011] Optionally, a transverse partition plate is fixedly connected to the annular body, and the partition plate has damping holes.

[0012] By adopting the above technical solution, when compressed gas passes through the damping orifice, the damping orifice can increase the resistance to the flow of compressed gas, thereby consuming vibration energy. This allows the pendulum air-bearing vibration isolator to return to its initial state more quickly, improving the stability of the system.

[0013] Optionally, the bottom end of the second fixed plate is provided with a swing block, which is immersed in damping fluid.

[0014] By adopting the above technical solution, when the pendulum air-float vibration isolator is disturbed, the air spring drives the pendulum block to swing in the damping fluid, which can effectively reduce the amplitude of vibration.

[0015] Optionally, the air spring, annular body, first fixed plate, second fixed plate, rubber diaphragm, pressure ring, bearing plate and swing block are all coaxially arranged.

[0016] By adopting the above technical solution, coaxial installation enables the single pendulum air-bearing vibration isolator to work better, thereby achieving a better vibration isolation effect.

[0017] Optionally, the movable part is an upwardly convex arc-shaped structure.

[0018] By adopting the above technical solution, the movable part is an upwardly convex arc-shaped structure, which can increase the contact area between the movable part and the bearing plate, allowing the bearing plate to better compress the movable part, thereby better achieving the function of elastic buffering.

[0019] Optionally, the pressure ring has a first threaded hole in the vertical direction for inserting a screw, and there are multiple first threaded holes evenly distributed.

[0020] By adopting the above technical solution, multiple first threaded holes can make the force on the pressure ring more uniform, and at the same time make the rubber diaphragm more firmly fixed.

[0021] Optionally, the housing includes a bottom plate, side plates, and a top plate. There are six side plates, which form a regular hexagonal prism structure. The side plates are vertically fixed to the bottom plate and are sequentially fixedly connected. The top plate is fixedly connected to the end of the side plates away from the bottom plate, and a first mounting hole for installing an air spring is provided on the top plate.

[0022] By adopting the above technical solution, the air spring is installed into the housing through the first mounting hole, which is convenient for operation. At the same time, the structure of the regular hexagonal prism has good stability, which allows the pendulum air-bearing vibration isolator to distribute the force more evenly when under stress, reducing the risk of wear or breakage caused by uneven force, and helping to extend the service life of the pendulum air-bearing vibration isolator.

[0023] Optionally, the chain is provided in three parts, and the three chains are distributed in an equilateral triangle.

[0024] By adopting the above technical solution, the distribution of equilateral triangles has higher stability, resulting in lower horizontal stiffness of the pendulum air-bearing vibration isolator in the horizontal direction, further improving the speed at which the pendulum air-bearing vibration isolator returns to its initial stable position after being disturbed.

[0025] Optionally, the damping fluid may be selected with different viscosities.

[0026] By adopting the above technical solution, damping fluids of different viscosities have different viscous resistances, which can flexibly adjust the damping ratio of the inverted pendulum air flotation vibration isolator, thereby meeting the needs of different actual situations.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. When vibration is transmitted to the pendulum air-bearing vibration isolator, the vertical vibration causes the compressed gas in the air spring chamber to reciprocate, thereby achieving the effect of elastic buffering and isolating vertical vibration; the horizontal vibration causes the air spring to perform pendulum motion in the outer shell, while the bottom of the air spring swings in the hollow cylinder. The damping fluid consumes kinetic energy and converts it into heat energy, which reduces the swing amplitude of the air spring until it returns to the equilibrium position, thus achieving the effect of isolating horizontal vibration.

[0029] 2. By setting three chains of adjustable length and selecting damping fluids of different viscosities, the damping ratio of the inverted pendulum air flotation vibration isolator can be flexibly adjusted to meet the needs of different actual situations;

[0030] 3. By setting a partition plate, two chambers are formed in the air spring, and the two chambers are connected by a damping hole. When compressed gas passes through the damping hole, the damping hole can increase the resistance to the flow of compressed gas, thereby consuming vibration energy, so that the pendulum air-bearing vibration isolator can return to the initial state more quickly and improve the stability of the system. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0032] Figure 2 This is a cross-sectional view of an embodiment of this application;

[0033] Figure 3 yes Figure 2 A magnified view of area A in the middle.

[0034] Reference numerals: 1. Outer shell; 11. Base plate; 12. Side plate; 13. Top plate; 131. First mounting hole; 132. Second threaded hole; 2. Chain; 3. Air spring; 31. Ring body; 32. First fixing plate; 321. Second mounting hole; 33. Second fixing plate; 331. Third threaded hole; 332. Swing block; 34. Rubber diaphragm; 341. Moving part; 35. Pressure ring; 351. First threaded hole; 36. Bearing plate; 361. Pressure block; 37. Air chamber; 38. Divider plate; 39. Damping hole; 4. Hollow cylinder; 41. Damping fluid. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0036] This application discloses a single-pendulum air-float vibration isolator, referring to... Figure 1 and Figure 2The system includes a housing 1, an adjustable-length chain 2, an air spring 3, and a hollow cylinder 4. The air spring 3 is installed in the housing 1 and is filled with compressed gas. One end of the chain 2 is fixedly connected to the housing 1, and the other end of the chain 2 is fixedly connected to the air spring 3, so that the air spring 3 forms a pendulum structure in the housing 1. The hollow cylinder 4 is fixed to the bottom inside the housing 1 and is filled with damping fluid 41. The bottom of the air spring 3 extends into the damping fluid 41. The upper end of the housing 1 is used to install equipment that requires vibration isolation.

[0037] When vibration is transmitted to the pendulum air-float vibration isolator, the vertical vibration causes the compressed gas in the air spring 3 to reciprocate, thereby achieving the effect of elastic buffering and realizing the effect of vertical vibration isolation; the horizontal vibration causes the air spring 3 to perform pendulum motion in the outer shell 1, while the bottom of the air spring 3 swings in the hollow cylinder 4. The damping fluid 41 consumes kinetic energy and converts it into heat energy, which reduces the swing amplitude of the air spring 3 until it returns to the equilibrium position, thus realizing the effect of horizontal vibration isolation.

[0038] Specifically, the outer casing 1 includes a bottom plate 11, side plates 12, and a top plate 13. Six side plates 12 are provided, forming a regular hexagonal prism structure. The six side plates 12 are vertically fixed to the bottom plate 11, and the sides of each side plate 12 are connected sequentially. The top plate 13 is fixedly connected to the top of the side plates 12, and the bottom plate 11 is fixedly connected to the bottom of the side plates 12. The bottom plate 11 is rectangular, and fixing holes are provided at its four corners for fixing the pendulum air-bearing vibration isolator to the ground. In this embodiment, the bottom plate 11, side plates 12, and top plate 13 are integrally formed. A circular first mounting hole 131 is provided at the center of the top plate 13, through which the air spring 3 is installed into the outer casing 1.

[0039] Reference Figure 2 and Figure 3 The air spring 3 includes an annular body 31, a first fixing plate 32, a second fixing plate 33, a rubber diaphragm 34, a pressure ring 35, and a bearing plate 36. The annular body 31 has openings at its upper and lower ends. The first fixing plate 32 is integrally formed at the top end of the annular body 31, and the second fixing plate 33 is integrally formed at the bottom end of the annular body 31. A second mounting hole 321 is provided at the center of the first fixing plate 32. The rubber diaphragm 34 covers the second mounting hole 321 to seal it. The outer edge of the rubber diaphragm 34 is fixedly mounted on the first fixing plate 32 by the pressure ring 35. The inner wall of the pressure ring 35 is flush with the wall of the second mounting hole 321, forming an air chamber 37 for filling compressed gas between the rubber diaphragm 34, the annular body 31, the first fixing plate 32, and the second fixing plate 33.

[0040] The pressure ring 35 has a plurality of first threaded holes 351 in the vertical direction. The plurality of first threaded holes 351 are evenly distributed around the circumference of the pressure ring 35. The first threaded holes 351 are used to insert screws to securely fix the outer edge of the rubber diaphragm 34 onto the first fixing plate 32.

[0041] A pressure block 361 protrudes from one end of the bearing plate 36 near the rubber diaphragm 34. The pressure block 361 abuts against the center of the rubber diaphragm 34, forming a movable part 341 between the outer edge and the center of the rubber diaphragm 34. The movable part 341 is designed as an upwardly protruding arc-shaped structure, which makes the contact area between the movable part 341 and the pressure block 361 large, thereby achieving a better elastic buffering effect and vibration isolation. The bearing plate 36 also abuts against the top of the pressure ring 35 and the top plate 13, making the horizontal swing amplitude of the bearing plate 36 smaller. Equipment requiring vibration isolation is installed on the bearing plate 36.

[0042] A transverse partition plate 38 is provided in the annular body 31. The partition plate 38 is fixedly connected to the inner side of the annular body 31, dividing the interior of the air chamber 37 into upper and lower chambers. A damping hole 39 is provided in the center of the partition plate 38, which connects the upper and lower chambers of the air chamber 37, allowing the compressed gas in the upper and lower chambers to flow to each other, thereby consuming vibration energy and enabling the pendulum air-bearing vibration isolator to return to its initial state more quickly, thus improving the stability of the system.

[0043] The top plate 13 has three second threaded holes 132, which are evenly distributed around the first mounting hole 131, forming an equilateral triangle. The second fixing plate 33 has three corresponding third threaded holes 331, with the axes of the second threaded holes 132 and the corresponding third threaded holes 331 aligned on the same straight line. One end of the chain 2 is threaded into the second threaded hole 132 via a nut, and the other end is threaded into the third threaded hole 331 via a nut, allowing the air spring 3 to be suspended in the outer casing 1 via the chain 2, forming a pendulum with reasonable force distribution and good stability. Furthermore, the length of the chain 2 can be adjusted as needed to regulate the horizontal natural frequency of the pendulum air-bearing vibration isolator.

[0044] The hollow cylinder 4 is coaxially arranged with the annular body 31; a swing block 332 is protruding from the center of the end of the second fixed plate 33 facing the base plate 11, and the swing block 332 is immersed in the damping fluid 41 in the hollow cylinder 4. When the air spring 3 swings, the swing block 332 swings in the damping fluid 41; since the damping fluid 41 has a certain viscosity, it generates viscous resistance during vibration, which can convert the mechanical energy in the vibration system into heat energy, so that the system can quickly consume the vibration energy, thereby enabling the single pendulum air-bearing vibration isolator to quickly restore the equilibrium state and maintain strong stability.

[0045] Depending on the specific needs of different situations, damping fluids 41 with different viscosities can be selected to obtain different viscous resistance, thereby flexibly adjusting the damping ratio of the pendulum air-float vibration isolator.

[0046] The implementation principle of the pendulum air-floating vibration isolator disclosed in this application is as follows: During operation, compressed gas (the pressure of the compressed gas is selected according to the actual situation) is filled into the air chamber 37, causing the rubber diaphragm 34, the bearing plate 36, and the equipment to be lifted. When the vibration is transmitted to the pendulum air-floating vibration isolator, the horizontal vibration causes the air spring 3 to perform a pendulum motion in the outer shell 1, while the pendulum block 332 swings in the damping fluid 41 of the hollow cylinder 4. The damping fluid 41 consumes the vibration energy, reducing the swing of the pendulum block 332 until it returns to the equilibrium position. The vertical vibration causes the compressed gas in the air chamber 37 to flow from the high-pressure end to the low-pressure end. When the compressed gas passes through the damping hole 39, the damping hole 39 can consume the vibration energy by increasing the resistance to the flow of the compressed gas, thereby reducing the propagation of vibration and allowing the pendulum air-floating vibration isolator to return to the initial state more quickly, improving the stability of the system. In this embodiment, there is a damping groove, and the length of the chain 2 during the pendulum motion can be adjusted, which can flexibly adjust the damping ratio of the pendulum air-floating vibration isolator.

[0047] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A single pendulum air-bearing vibration isolator, characterized in that, The device includes a housing (1), an air spring (3), an adjustable chain (2), and a hollow cylinder (4). The housing (1) is fixed to the ground. The air spring (3) is installed in the housing (1) through the chain (2) to form a pendulum structure. The air spring (3) is filled with compressed gas. The upper end of the air spring (3) is used to install equipment that needs vibration isolation. The hollow cylinder (4) is fixed to the bottom inside the housing (1). The hollow cylinder (4) is filled with damping fluid (41). The bottom of the air spring (3) extends into the damping fluid (41).

2. The single pendulum air-bearing vibration isolator according to claim 1, characterized in that, The air spring (3) includes an annular body (31), a first fixing plate (32), a second fixing plate (33), a rubber diaphragm (34), a pressure ring (35), and a support plate (36). The annular body (31) has openings at its upper and lower ends. The first fixing plate (32) is fixed to the top end of the annular body (31), and the second fixing plate (33) is fixed to the bottom end of the annular body (31). The first fixing plate (32) has a second mounting hole (321). The rubber diaphragm (34) is used to close the second mounting hole (321) to form the air chamber (37) of the air spring (3). The pressure ring (35) is used to fix the outer edge of the rubber diaphragm (34) to the first fixing plate (32). The support plate (36) abuts against the upper part of the middle of the rubber diaphragm (34). The middle part and the outer edge of the rubber diaphragm (34) are the movable part (341).

3. A single pendulum air-bearing vibration isolator according to claim 2, characterized in that, A transverse partition plate (38) is fixedly connected to the annular body (31), and a damping hole (39) is provided on the partition plate (38).

4. A single pendulum air-bearing vibration isolator according to claim 2, characterized in that, The bottom end of the second fixed plate (33) is provided with a swing block (332), which is immersed in the damping liquid (41).

5. A single pendulum air-bearing vibration isolator according to claim 4, characterized in that, The air spring (3), the annular body (31), the first fixing plate (32), the second fixing plate (33), the rubber diaphragm (34), the pressure ring (35), the bearing plate (36), and the swing block (332) are all coaxially arranged.

6. A single pendulum air-bearing vibration isolator according to claim 2, characterized in that, The movable part (341) is an upwardly protruding arc-shaped structure.

7. A single pendulum air-bearing vibration isolator according to claim 2, characterized in that, The pressure ring (35) has a first threaded hole (351) for inserting a screw in the vertical direction. There are multiple first threaded holes (351), and the multiple first threaded holes (351) are evenly distributed.

8. A single pendulum air-bearing vibration isolator according to claim 1, characterized in that, The outer casing (1) includes a bottom plate (11), side plates (12) and a top plate (13). There are six side plates (12), which form a regular hexagonal prism structure. The side plates (12) are vertically fixed to the bottom plate (11). The side plates (12) are fixedly connected in sequence. The top plate (13) is fixedly connected to the end of the side plate (12) away from the bottom plate (11). The top plate (13) has a first mounting hole (131) for installing an air spring (3).

9. A single pendulum air-bearing vibration isolator according to claim 1, characterized in that, The chain (2) is provided in three parts, and the three chains (2) are distributed in an equilateral triangle.

10. A single pendulum air-bearing vibration isolator according to claim 1, characterized in that, The damping fluid (41) can be selected with different viscosities.

Images