CN108361314B - A kind of air spring low frequency vibration isolation device folded based on three Pus - Google Patents

Abstract

The present invention relates to a kind of air spring low frequency vibration isolation devices folded based on three Pus, bottom plate including top plate and matching setting, elastic vibration isolation mechanism is additionally provided between the top plate and bottom plate, the elastic vibration isolation mechanism is made of three Pu folded form Multi cell structures with Hookean spring, the Hookean spring is set on the central axis of three Pu folded form Multi cell structures, upper end and top plate are connected, and lower end and bottom plate are connected, and have the gap for preventing from interfering between three Pu folded form Multi cell structures.Invention can adjust vibration isolator stiffness curve by adjusting Multi cell structure cavity pressure, adjustment linear rigidity spring performance or changing the dimensional parameters of parallelogram, realize the adjustable of anti-vibration performance according to by the size of vibration isolation quality.

Description

An Air Spring Low Frequency Vibration Isolation Device Based on Miura Folding

technical field

The invention relates to a low-frequency vibration isolation device, in particular to an air spring low-frequency vibration isolation device based on Miura folding, and belongs to the technical field of composite pipes.

Background technique

In low-frequency excitation environment (such as vehicle seats, precision instruments and other equipment), low-frequency vibration has a major impact on the health of drivers or the accuracy and service life of precision instruments. The adjustable low-frequency vibration isolation device can effectively isolate the vibration on the one hand, and can adjust the performance of the vibration isolation device according to the change of the load. In addition, due to the different application places, it is required that the vibration isolation device can be flexibly applied to various spatial scales.

Chinese invention patent "Ultra-low frequency vibration isolator based on parallel connection of positive and negative stiffness springs" (application number: 201210118783.4, publication date: 2012-08-01, publication number: CN102619916A) discloses an ultra-low frequency vibration isolator based on positive and negative stiffness springs connected in parallel The vibration isolator is composed of a guide column, a cover, a slider, a negative stiffness spring, a lower cover, a guide seat, a ball and a main spring. Function, the main spring is a positive stiffness compression spring, the main spring is set outside the guide column, the upper and lower ends of the main spring are respectively positioned and supported by the inner surface of the top cover of the cover and the end surface of the groove of the guide seat, and the sleeve, slider, and negative stiffness Compression springs and balls constitute a negative stiffness spring mechanism. An even number of cylindrical holes are evenly distributed in the inner circumference of the cover, which are respectively matched with the same number of sliders. The sliders can slide in the cylindrical holes, and the negative stiffness springs are installed inside the sliders. , and is positioned and supported by the end surface of the cylindrical hole on the slider and the cover. The balls cooperate with the spherical surface of the slider and can rotate flexibly with each other. Structure, the spherical surface is in contact with the ball and the ball rolls on it when the sleeve cover and the lower cover have relative displacement. It connects the main spring (positive stiffness spring) and the negative stiffness mechanism in parallel so that the shock absorber has the characteristics of high static stiffness and low dynamic stiffness, and realizes zero-hertz ultra-low frequency vibration isolation. Quality adjusts the stiffness curve of the vibration isolator to achieve adjustable vibration isolation performance; balls are used to achieve rolling friction to reduce frictional resistance; however, the problem with this vibration isolator is that the mechanical structure is relatively complex, and its application is difficult when the space scale is small .

The Miura folding technique is a method of unfolding the item by pulling apart the two ends of the diagonal, and pushing it in the opposite direction when shrinking. This method can not only save space, but also avoid loss during folding and unfolding. And through research, it is found that this method can reduce the volume of the object by 25 times, but increase the energy density by 14 times.

How to apply Miura folding technology to low-frequency vibration isolation devices is a crucial matter.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above-mentioned problems in the prior art, and propose a low-frequency vibration isolation device based on Miura folding air springs with reasonable structure, convenient use, strong periodicity, adjustable vibration isolation performance, and large scale range.

In order to achieve the above objectives, the present invention provides a Miura-folded air spring low-frequency vibration isolation device, comprising a top plate (1) and a bottom plate (2) matched with it, the top plate (1) and the bottom plate (2) An elastic vibration isolation mechanism is also arranged between them, and the elastic vibration isolation mechanism is composed of a Miura folded multicellular structure (3) and a linear spring (5). ), the upper end is fixedly connected with the top plate (1), the lower end is fixedly connected with the bottom plate (2), and there is a gap between the Miura folded multicellular structure (3); the Miura folded multicellular structure (3) ) is formed by continuous expansion of several cell tubes (31) along the three-dimensional space, and the adjacent sides between the cell tubes (31) are connected by rotating pairs.

Further, in the aforementioned air spring low-frequency vibration isolation device based on Miura folding, the cell tube (31) includes a first Miura folding structure (311) and a second Miura folding structure (312), and the first three An inner cavity is formed between the Pu folding structure (311) and the second Miura folding structure (312), and the air bag (4) is accommodated in the inner chamber, and the first Miura folding structure (311) and the second Miura folding structure (311) are connected to the second Miura folding structure (312). Adjacent sides of the folded structure (312) are connected by rotating pairs.

Further, in the aforementioned air spring low-frequency vibration isolation device based on Miura folding, the first Miura folding structure (311) is obtained by continuous expansion of Miura structural units (3112) along the same direction, and each adjacent Miura structural unit (3112) The adjacent sides are connected by rotating joints. The Miura structural unit (3112) is obtained by combining four identical parallelograms according to the Miura folding rule, and the adjacent sides of each Miura structural unit (3112) are connected by a revolving pair.

Further, the aforementioned air spring low-frequency vibration isolation device based on Miura folding has a groove (22) on the bottom plate (2), and the path of the groove (22) is consistent with that of the Miura folding type cellular structure (3). The bottoms have the same shape and pass below each cell tube (31). An air bag (4) is arranged in the groove (22). The air bag in the groove (22) communicates with the air bag in each cell tube (31).

Further, in the aforementioned air spring low-frequency vibration isolation device based on Miura folding, the outer surface of the airbag (4) is glued and fixed to the inner wall of the cell tube (31) and the bottom plate groove (22), and the bottom of one side is provided with a Air inlet (41) and air outlet (42) are arranged. The air bag (4) air inlet (41) is externally connected to the air source equipment, and the air outlet (42) is equipped with a pressure reducing valve.

Further, in the aforementioned Miura folding-based air spring low-frequency vibration isolation device, the top plate (1) and the bottom plate (2) are respectively provided with installation holes (11) and (21).

The beneficial effects of the present invention are: the present invention uses Miura folding technology to replace the mechanical structure in the existing low-frequency vibration isolation device, which is mainly composed of top plate, bottom plate, periodic Miura folding multicellular structure, air bag and linear stiffness spring, eliminating the complicated Unique mechanical components and mechanisms make the invention simple in structure and strong in periodicity.

At the same time, the present invention can adjust the stiffness curve of the vibration isolator according to the size of the vibration-isolated mass by adjusting the pressure in the cavity of the multicellular structure, adjusting the linear stiffness spring characteristics, or changing the size parameters of the parallelogram, so as to realize the adjustable vibration isolation performance.

And the structure of the present invention covers almost every scale from macro to micro, and can be applied in a wide range of scales.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a top view of the present invention after the top plate is removed.

Fig. 3 is a sectional view of A-A in Fig. 2 .

Fig. 4 is a schematic diagram of the spatial expansion of the cell tube of the present invention.

Fig. 5 is a schematic diagram of the structure of the cell tube of the present invention.

Fig. 6 is a schematic diagram of the Miura fold unit structure of the present invention.

FIG. 7 is a schematic structural diagram of the parallelogram in FIG. 6 of the present invention.

Fig. 8 is a schematic structural view of the bottom plate of the present invention.

Fig. 9 is a mechanical characteristic curve of the present invention, wherein Fig. 9a is a force-displacement characteristic curve, and Fig. 9b is a stiffness-displacement characteristic curve.

FIG. 10 is a schematic diagram of the manufacturing method of the Miura folded unit structure in FIG. 6 at a smaller size.

Detailed ways

An air spring low-frequency vibration isolation device based on Miura folding provided in this embodiment, the structure is shown in Figures 1 to 8, including a top plate 1 and a matching bottom plate 2, and the top plate and the bottom plate are respectively provided with mounting holes 11 and mounting holes 21.

At the same time, an elastic vibration isolation mechanism is provided between the top plate and the bottom plate, and the elastic vibration isolation mechanism is composed of a Miura folded cellular structure 3 and a linear stiffness spring 5 . The upper and lower ends of the Miura folded multicellular structure and the linear stiffness spring are respectively connected to the top plate and the bottom plate by bonding or welding; among them, the linear stiffness spring is arranged on the central axis of the Miura folded multicellular structure, and the upper end is fixedly connected to the top plate , the lower end is firmly connected with the bottom plate, and there is a gap between the Miura folded multicellular structure. As shown in FIG. 4 , the Miura folded multicellular structure is formed by continuous expansion of several cell tubes 31 along the three-dimensional space, and the adjacent sides between the cell tubes are connected by rotation pairs.

As shown in FIG. 5 , the cell tube includes a first Miura-fold structure 311 and a second Miura-fold structure 312 . Wherein, an inner cavity is formed between the first Miura folding structure and the second Miura folding structure to accommodate the airbag 4, and the adjacent sides of the first Miura folding structure and the second Miura folding structure are connected by a rotating pair .

As shown in FIG. 6 , the first Miura-folded structure is obtained by continuous expansion of Miura structural units 3112 along the same direction, and adjacent sides of adjacent Miura structural units are connected by rotation pairs. And the Miura structural unit is obtained by combining four identical parallelograms according to the Miura folding rule, and the adjacent sides are connected by revolving pairs. The structural parameters of the parallelogram are shown in Figure 7.

As shown in FIG. 8 , a groove 22 is also opened on the bottom plate, and the path of the groove passes under each cell tube 31 , and an air bag is also arranged inside the groove. The air bag in each cell tube and the air bag in the groove communicate with each other.

At the same time, the outer surface of the airbag is glued to the inner wall of the cell tube and the groove of the bottom plate, and an air inlet 41 and an air outlet 42 are provided on the bottom side of the airbag. The air inlet of the air bag is externally connected with an air source device, and the air outlet is equipped with a pressure reducing valve.

Example 1

As shown in Figure 1, the present invention is based on the Miura folded air spring low-frequency vibration isolation device, and the installation and use of the vibration isolation device has a large space, such as when used in the field of small and medium-sized machinery, the parallelogram in the Miura structural unit The structure adopts steel sheets with large thickness and not easily deformed, and its dimensional characteristics are a=b, γ=75°. The connection between each structure adopts a rotating pair similar to ordinary door hinges, including the fixing parts installed on the two adjacent structures. The protrusions at the edges of the fixing parts are provided with shaft holes. When the adjacent two fixing parts When the shaft holes are butted, a rotating shaft is inserted in the aligned shaft holes of adjacent fixing parts, so that the adjacent structures can rotate relative to each other along the rotating shaft. This allows adjacent structures to be folded or unfolded relative to each other so that each structure can be folded or unfolded in a Miura fold. The linear stiffness spring is placed in the center of the cellular structure, and the spring and the upper and lower ends of the cellular structure are welded to the top plate and the floor. By connecting an air source device externally to the air inlet 41 and installing a pressure reducing valve on the air outlet 42, the cavity of the Miura foldable cellular structure 3 has a constant pressure. According to the existing academic research, when the Miura folded cellular structure 3 is rigidly folded and the pressure in its cavity is kept constant, it has negative stiffness characteristics in the vertical direction, that is, the Y direction. In this way, when the linear stiffness spring 5 (positive stiffness) is connected in parallel with the Miura folded cellular structure 3 (negative stiffness), the nonlinear characteristics of high static stiffness and low dynamic stiffness of the air spring low-frequency vibration isolation device can be realized, such as As shown in Figure 9, and the dynamic stiffness can theoretically achieve zero stiffness, so as to achieve ultra-low frequency vibration isolation, Figure 9a is the force-displacement characteristic curve of the device, and Figure 9b is the stiffness-displacement characteristic curve of the device.

Embodiment 2

As shown in Figure 1, the present invention is based on the Miura folded air spring low-frequency vibration isolation device, and the installation and use place of the vibration isolation device is centimeter or millimeter level. The parallelogram structure is made of hard plastic, and its size is characterized by a=b, γ=75°. Each structure is connected to each other through a flexible part that can be bent. In this embodiment, the flexible part adopts a plastic mold, and the various structures are connected together through a plastic film 6 and the relationship between the rotation pairs between their adjacent sides is maintained, such as Figure 10 shows. The linear stiffness spring is placed in the center of the cellular structure, and the spring and the upper and lower ends of the cellular structure are bonded to the top plate and the floor. By connecting an air source device externally to the air inlet 41 and installing a pressure reducing valve on the air outlet 42, the cavity of the Miura foldable cellular structure 3 has a constant pressure. According to the existing academic research, when the Miura folded cellular structure 3 is rigidly folded and the pressure in its cavity is kept constant, it has negative stiffness characteristics in the vertical direction, that is, the Y direction. In this way, when the linear stiffness spring 5 (positive stiffness) is connected in parallel with the Miura folded cellular structure 3 (negative stiffness), the nonlinear characteristics of high static stiffness and low dynamic stiffness of the air spring low-frequency vibration isolation device can be realized, such as As shown in Figure 9, and the dynamic stiffness can theoretically achieve zero stiffness, so as to achieve ultra-low frequency vibration isolation, Figure 9a is the force-displacement characteristic curve of the device, and Figure 9b is the stiffness-displacement characteristic curve of the device.

In addition to the above-mentioned embodiments, the present invention can also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims (10)

1. An air spring low-frequency vibration isolation device based on Miura folding, including a top plate (1) and a bottom plate (2) matched with it, characterized in that: there is also a set between the top plate (1) and the bottom plate (2) There is an elastic vibration isolation mechanism, and the elastic vibration isolation mechanism is composed of a Miura folded multicellular structure (3) and a linear spring (5), and the linear spring (5) is arranged at the center of the Miura folded multicellular structure (3) On the axis, the upper end is fixedly connected with the top plate (1), the lower end is fixedly connected with the bottom plate (2), and there is a gap between the Miura folded cellular structure (3) to prevent mutual interference; The Miura folded multicellular structure (3) is formed by continuous expansion of several cell tubes (31) along the three-dimensional space, and the adjacent sides between the cell tubes (31) are connected by rotation pairs, and the The rotation pair is selected on the basis of the size of the Miura folded cellular structure (3). 2. The air spring low-frequency vibration isolation device based on Miura folding according to claim 1, characterized in that: the cell tube (31) includes a first Miura folding structure (311) and a second Miura folding structure ( 312), a rhombus-shaped inner chamber is formed between the first Miura folded structure (311) and the second Miura folded structure (312), and an airbag (4) is accommodated in the inner chamber; the first The Miura folded structure ( 311 ) and the second Miura folded structure ( 312 ) are mirror images of each other along the diagonal of the rhombus, and adjacent sides of the two are connected by a rotating pair. 3. The air spring low-frequency vibration isolation device based on Miura folding according to claim 2, characterized in that: the first Miura folding structure (311) is obtained by continuous expansion of Miura structural units (3112) along the same direction, each Adjacent sides of adjacent Miura structural units (3112) are connected by rotating pairs. 4. The air spring low-frequency vibration isolation device based on Miura folding according to claim 3, characterized in that: the Miura structural unit (3112) is obtained by combining four identical parallelograms according to the Miura folding law, and each Miura structural unit The adjacent sides of (3112) are connected by rotating joints. 5. The air spring low-frequency vibration isolation device based on Miura folding according to claim 1, characterized in that: there is a groove (22) on the bottom plate (2), and the path of the groove (22) is the same as that of the Miura folding The bottom of the type multicellular structure (3) has the same shape and passes under each cell tube (31). 6. The Miura folding-based air spring low-frequency vibration isolation device according to claim 5, characterized in that: the groove (22) is provided with an air bag (4). 7. The Miura fold-based air spring low-frequency vibration isolation device according to claim 6, characterized in that: the airbags in the groove (22) and the airbags in each cell tube (31) communicate with each other. 8. The air spring low-frequency vibration isolation device based on Miura folding according to claim 6, characterized in that: the outer surface of the airbag (4) is glued to the inner wall of the cell tube (31) and the bottom plate groove (22) Sticker is fixed, and its one side bottom is provided with air inlet (41) and air outlet (42). 9. The air spring low-frequency vibration isolation device based on Miura folding according to claim 8, characterized in that: the air inlet (41) of the airbag (4) is externally connected to an air source device, and the air outlet (42) is equipped with a decompression valve. 10. The Miura folding-based air spring low-frequency vibration isolation device according to claim 1, characterized in that: the top plate (1) and the bottom plate (2) are respectively provided with installation holes.